View source for LIC-24-0006, (Fcs), Unit 1, Independent Spent Fuel Storage Installation, Phase 1 Final Status Survey Report to Support Approved License Termination Plan

{{Adams
| number = ML24114A232
| issue date = 04/17/2024
| title = (Fcs), Unit 1, Independent Spent Fuel Storage Installation, Phase 1 Final Status Survey Report to Support Approved License Termination Plan
| author name = Barker A
| author affiliation = Omaha Public Power District
| addressee name = 
| addressee affiliation = NRC/NMSS, NRC/NRR, NRC/Document Control Desk
| docket = 05000285, 07200054
| license number = DPR-040
| contact person = 
| case reference number = LIC-24-0006
| document type = Letter type:LIC, License-Application for Facility Operating License (Amend/Renewal) DKT 50, Report, Technical
| page count = 1
}}

=Text=
{{#Wiki_filter:10 CFR 50.90 10 CFR 50.82

LIC-24-0006 April 17, 2024

U. S. Nuclear Regulatory Commission Attn:  Document Control Desk Washington, DC  20555-0001

Fort Calhoun Station (FCS), Unit 1 Renewed Facility Operating License No. DPR-40 NRC Docket No. 50-285

Fort Calhoun Station Independent Spent Fuel Storage Installation NRC Docket No. 72-054

==Subject:==
Fort Calhoun Station, Unit No. 1              - Phase 1 Final Status Survey Report to Support Approved License Termination Plan

==References:==
: 1.                                                                    Letter     from     OPPD     (M. Fisher)     to USNRC     (Document     Control     Desk),     "License Amendment  Request  (LAR) 21-01:                                                    Revised  Fort  Calhoun  Station  License  to  Add License Condition 3.D to include License Termination Plan Requirements," dated August 3, 2021                                                                   (LIC-21-0005) (ML                                                                      21271A143)
: 2.                                                                             Letter    from NRC    (J. Parrott)    to    OPPD    (T. Via),    Fort Calhoun       Station,                                 Unit    1 -
Issuance of Amendment to Renewed Facility License                                   to Add License Condition t                                                                                        o Include   License   Termination   Plan   Requirements   (EPID   l-2021-LIT-0000)                                                                                                                                          ,   dated January 31, 2024                                                                                         (ML24019A145)
: 3.                                                                                                                         Safety Evaluation                                             from NRC (G. Chapman, C. Dennes, et. al.),   Safety Evaluation by  The  Office of  Nuclear  Material  Safety and  Safeguards  Related  to  Amendment No. 302  t                                                         o  Facility  Operating  License  No. DPR-40,              Omaha  Public  Power  District, Fort      Calhoun      Station,      Unit      1, Docket      No.      50-285,      dated      January      31,      2024 (ML24019A145)
: 4.                                                                                             Meeting   Summary -   03/27/2024   NRC   Meeting   with   Omaha   Public   Power   District   to Discuss   Submittal   of   Final   Status   Surveys   for   the   Decommissioning   of   Fort   Calhoun Station, Unit 1 (                    ML24075A099)

By {{letter dated|date=August 3, 2021|text=letter dated August 3, 2021}} (Reference 1), Omaha Public Power District (OPPD) submitted a License       Amendment       Request       (LAR)       to       add       a       license       condition,       3.D,       to       include       License Termination      Plan      (LTP)      requirements,      as      supplemented                               by      letters      dated      January      13,      2022 (ML22034A602), June 15, 2022 (ML22167A199), February            27, 2023 (ML23060A197), August 24, 2023 (ML23236A478), and December 6, 2023                                                                                                                                                 (ML23346A153).

On  January  31,  2024                                                                       (Reference  2),  the  NRC issued  Amendment  No. 302  to  Renewed  Facility License                       No. DPR-40 for the Fort Calhoun Station, Unit 1 (FCS), and the accompanying Safety

LIC-24-0006 Page 2

Evaluation Report   (SER) (Reference 3).             As the NRC described in their approval letter (Reference
: 2)          the  LTP,  provides  the  details  of  OPPDs  plan  for  characterizing,  identifying,  and                                                                          remediating the remaining residual radioactivity at the FCS site to a level that will allow the site            to be released for   unrestricted   use. The   FCS   LTP   also   describes   how   the   licensee   will   confirm   the   extent   and success    of    remediation    through    radiological    surveys,    provide    financial    assuranceto    complete decommissioning,  and  ensure  that  the  environmental  impacts  of  decommissioning                             activities  are within the scope originally envisioned in documented environmental evaluations for   the site.

To                           demonstrate       the       radiological       status       of       FCS,       and       confirm       the       extent       and       success       of remediation,  OPPD is submitting this Final Status Survey Report for Phase 1 of the Final Status Survey Plan                           for FCS           . The specifics of this submittal were discussed at a                                                        public meeting with the NRC on March 27, 2024 (Reference 4).

This letter contains no regulatory commitments.

If you s   hould have any questions regarding this submittal or require additional information, please contact Mrs             . Andrea K. Barker, CHP -                             Regulatory Assurance and Emergency Planning Manager at (531)                                                                                226-6051.

Respectfully,

Andrea K. Barker, CHP, MHP Regulatory Assurance and Emergency Planning Manager

AKB/akb

Attachments:
: 1)                             Fort Calhoun Station,                                                                   Final Status Survey Final Report -                       Phase 1                      , with 12 Final Status Survey Unit Release Records

c:                                                                                        J.          D. Parrott, NRC Senior Project Manager S. G. Anderson, NRC Senior Health Physicist, Region IV M.          T. Johnson, NRC Senior Health Physicist, Region IV 6 -
Fort Calhoun Station Decommissioning Project

FINAL STATUS SURVEY FINAL REPORT - PHASE 1

January 2024

FINAL STATUS SURVEY FINAL REPORT - PHASE 1

Prepared By:    R. Yetter III                                         Date:
ES LT/FSS QA Specialist

Prepared By:    C. Davis                                              Date:
ES LT/FSS Specialist

Reviewed By:    M. Uz                                                 Date:
ES LT/FSS Specialist

Reviewed By:    A. Barker                                             Date:
OPPD Regulatory Assurance & Emergency Planning Manager

Reviewed By:    A. Kodra                                              Date:
ES LT/FSS PM

Approved By:     B. Bishop                                             Date:
ES LT/FSS Manager

Approved By:     D. Whisler                                            Date:
OPPD Manager Radiation Protection & Chemistry

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FINAL STATUS SURVEY FINAL REPORT - PHASE 1

TABLE OF CONTENTS

1     Introduction ............................................................................................................................. 8 1.1      Executive Summary ......................................................................................................... 8 1.2      Phased Submittal Approach ........................................................................................... 11 1.2.1       Release of Non-Impacted Open Land ..................................................................... 11 1.2.2       Phase 2, 3, and 4 Final Status Survey Final Reports .............................................. 11 2     Final Status Survey Program Overview ................................................................................ 12 2.1      Survey Planning ............................................................................................................. 14 2.2      Survey Design ................................................................................................................ 19 2.3      Survey Implementation .................................................................................................. 21 2.4      Survey Data Assessment ................................................................................................ 22 2.5      Quality Assurance and Quality Control Measures ......................................................... 22 3     Site Information .................................................................................................................... 23 3.1      Site Description .............................................................................................................. 23 3.2      Survey Unit Description ................................................................................................. 27 3.3      Summary of Historical Radiological Data ..................................................................... 28 3.3.1       Historical Site Assessment ...................................................................................... 28 3.3.2       Characterization Surveys ........................................................................................ 29 3.4      Conditions at the Time of Final Status Survey .............................................................. 30 3.5      Identification of Potential Contaminants........................................................................ 30 3.6      Radiological Release Criteria ......................................................................................... 31 4     Final Status Survey Protocol ................................................................................................. 31 4.1      Data Quality Objectives ................................................................................................. 31 4.2      Survey Unit Designation and Classification .................................................................. 34 4.3      Background Determination ............................................................................................ 34 4.4      Final Status Survey Sample Plans .................................................................................. 34 4.5      Survey Design ................................................................................................................ 34 4.5.1       Determination of Number of Data Points ............................................................... 34 4.5.2       Sample Locations .................................................................................................... 35 4.6      Instrumentation............................................................................................................... 35

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4.6.1       Detector Efficiencies ............................................................................................... 36 4.6.2       Detector Sensitivities .............................................................................................. 36 4.6.3       Instrument Maintenance and Control...................................................................... 37 4.6.4       Instrument Calibration ............................................................................................ 37 4.7      Survey Methodology ...................................................................................................... 38 4.7.1       Scan Surveys ........................................................................................................... 38 4.7.2       Soil .......................................................................................................................... 38 4.8      Quality Control Surveys ................................................................................................. 39 5     Survey Findings .................................................................................................................... 39 5.1      Survey Data Conversion................................................................................................. 40 5.2      Survey Data Verification and Validation ....................................................................... 41 5.3      Anomalous Data/Elevated Scan Results and Investigation ........................................... 42 5.4      Evaluation of Number of Measurement Locations in Survey Units .............................. 42 5.5      Comparison of Findings with Derived Concentration Guideline Levels ....................... 43 5.6      Description of ALARA to Achieve Final Activity Levels ............................................. 44 5.7      NRC/Independent Verification Team Findings ............................................................. 44 6     Summary ............................................................................................................................... 44 7     References ............................................................................................................................. 45 8     Appendices ............................................................................................................................ 46

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LIST OF TABLES

Table 1-1       Phase 1 Survey Units ............................................................................................................................. 9 Table 2-1       Initial Suite of Radionuclides .............................................................................................................. 16 Table 2-2       OpDCGLs for Surface and Subsurface Soil ...................................................................................... 17 Table 2-3       BcDCGLs for Surface and Subsurface Soil ....................................................................................... 17 Table 2-4       FCS Survey Unit Surface Area Limits ............................................................................................... 19 Table 2-5       Recommended Survey Coverage for FSS .......................................................................................... 20 Table 4-1       FSS Investigation Levels ..................................................................................................................... 32 Table 4-3       Number of Samples for FSS ................................................................................................................ 35 Table 4-4       Summary of Total Area Scanned for Phase 1 Survey Units............................................................. 38 Table 5-1       Basic Statistical Properties of Phase 1 Random Sample Populations ............................................. 40 Table 5-2       Basic Statistical Properties of Phase 1 Judgmental Sample Populations ........................................ 41 Table 5-3       Mean BcSOF and Dose Contribution................................................................................................. 43

LIST OF FIGURES

Figure 1-1          Phase 1 Survey Unit Locations ....................................................................................................... 10 Figure 2-1          License Termination/Final Status Survey Group Organizational Chart ................................... 13 Figure 3-1          Site Regional Location .................................................................................................................... 24 Figure 3-2          FCS Site Boundaries ....................................................................................................................... 25 Figure 3-3          FCS Site Layout ............................................................................................................................... 26

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LIST OF ABBREVIATIONS ALARA        as low as is reasonably achievable AMCG         average member of the critical group BcDCGL       base case derived concentration guideline level BcSOF        base case sum of fractions CFR          Code of Federal Regulations DQA          data quality assessment DQO          data quality objective DCGL         derived concentration guideline level FCS          Fort Calhoun Station FSS          final status survey FSSFR        final status survey final report GPS          Global Positioning System HSA          historical site assessment HTD          hard-to-detect IC           insignificant contributor ISFSI        Independent Spent Fuel Storage Installation LBGR         lower bound of the gray region LT/FSS       License Termination/Final Status Survey LTP          license termination plan MARLAP       Multi-Agency Radiological Laboratory Analytical Protocols Manual MARSSIM      Multi-Agency Radiation Survey and Site Investigation Manual MDC          minimum detectable concentration MDCR         minimum detectable count rate NaI          sodium iodide NIST         National Institute of Standards and Technology NRC          U.S Nuclear Regulatory Commission OCA          Owner Controlled Area OLA          open land area

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OpDCGL       operational derived concentration guideline level OPPD         Omaha Public Power District QAPP         quality assurance project plan QC           quality control RA           radiological assessment ROC          radionuclides of concern SOF          sum of fractions SURR         survey unit release record TEDE         total effective dose equivalent TSD          technical support document UBGR         upper bound of the gray region UCL          upper confidence limit VSP          Visual Sample Plan

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1       Introduction

1.1     Executive Summary The purpose of this Phase 1 Final Status Survey Final Report (FSSFR) is to provide a summary of the survey results and overall conclusions which demonstrate that the Fort Calhoun Station (FCS) facility, or portions of the site, meets the 25 millirem per year (mrem/yr) release criterion as established in Nuclear Regulatory Commission (NRC) Regulation 10 CFR 20.1402, Radiological Criteria for Unrestricted Use. The final status survey (FSS) results provided herein demonstrate that any residual radioactivity results in a total effective dose equivalent (TEDE) to an average member of the critical group (AMCG) that does not exceed 25 mrem/yr and that the residual radioactivity has been reduced to levels that are as low as is reasonably achievable (ALARA). The release criterion is translated into site-specific derived concentration guideline levels (DCGL) for assessment and summary.
This report documents that FSS activities were performed consistent with the guidance provided in the Fort Calhoun Station Decommissioning Project License Termination Plan (LTP)
(Reference 1); NUREG-1575, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM) (Reference 2); FCSD-RA-LT-100, Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station (QAPP) (Reference 3); FCSD-RA-LT-302, Final Status Survey Sample Plan Development (Reference 4); FCSD-RA-LT-303, Final Status Survey Isolation and Control Measures (Reference 5); FCSD-RA-LT-304, Final Status Survey Data Assessment (Reference 6); as well as other various station implementing procedures.
This FSSFR has been written consistent with the guidance provided in NUREG-1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance - Characterization, Survey, and Determination of Radiological Criteria (Reference 7); MARSSIM; and the requirements specified in FCSD-RA-LT-305, Final Status Survey Data Reporting (Reference 8).
To facilitate the data management process, FSSFRs incorporate multiple survey unit release records (SURR). SURRs are complete and unambiguous records of the as-left radiological status of specific survey units. Sufficient data and information are provided in each SURR to enable an independent re-creation and evaluation at some future time of both the survey activities and the derived results.
This Phase 1 FSSFR specifically addresses 12 open land area (OLA) survey units. This report contains a compilation of all 12 SURRs that are within the Phase 1 scope. Table 1-1 provides a listing of all the survey units addressed in this report, along with their classifications and size.
Figure 1-1 depicts the locations of the survey units in relation to the FCS site as well as survey unit boundaries.

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Table 1-1      Phase 1 Survey Units Survey Unit   Type             Survey Unit Description            Class   Size (m2)

8101      OLA            North Owner Controlled Area            3      99,210 8102      OLA            North Owner Controlled Area            3      74,685 8103      OLA            North Owner Controlled Area            3      58,497 8104      OLA            North Owner Controlled Area            3      99,971 8105      OLA            North Owner Controlled Area            3      99,994 8106      OLA            North Owner Controlled Area            3      99,788 8109      OLA            North Owner Controlled Area            3      98,266 8110      OLA            North Owner Controlled Area            3      105,611 8202      OLA            West Owner Controlled Area             3      54,169 8203      OLA            West Owner Controlled Area             3      99,184 8305      OLA            South Owner Controlled Area            3      98,059 8307      OLA            South Owner Controlled Area            3      90,659

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Figure 1-1  Phase 1 Survey Unit Locations

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All FSS activities essential to data quality have been implemented and performed under approved procedures. Trained individuals, using properly calibrated instruments and laboratory equipment that are sensitive to the suspected contaminants, performed the FSS of the Phase 1 survey units. The survey data for all Phase 1 survey units demonstrate that the dose from residual radioactivity is less than the maximum annual dose which corresponds to the release criterion for license termination for unrestricted use specified in 10 CFR 20.1402 and support the release of these areas from the 10 CFR 50 license. Additionally, the ALARA requirement of 10 CFR 20.1402 has also been satisfied.

1.2     Phased Submittal Approach To minimize the incorporation of redundant historical assessment and other FSS program information, and to facilitate potential phased releases from the current license, FSSFRs will be prepared in a phased approach. This is the first FSSFR to be generated and submitted to the NRC during the decommissioning project. OPPD estimates that a total of four FSSFRs will be generated and submitted to the NRC during the course of the decommissioning project.

1.2.1   Release of Non-Impacted Open Land On November 12, 2018, and June 29, 2018, OPPD submitted requests (LIC-18-0023 & LIC 0030) to release a portion of the FCS site from the 10 CFR 50 license in accordance with 10 CFR 50.83, Release of Part of a Power Reactor Facility or Site for Unrestricted Use, and 10 CFR 100, Reactor Site Criteria. Specifically, reports were generated for the requests that address the release of five non-impacted open land areas from the 10 CFR 50 license. The reports contain summaries of the final assessment performed as well as a summaries of the characterization surveys performed of these non-impacted survey units. OPPD reviewed and assessed the subject property to ensure that the radiological condition of these land areas will have no adverse impact on the ability of the site, in aggregate, to meet 10 CFR 20, Subpart E, Radiological Criteria for License Termination. The reports were not captured as a Phased Submittal with an FSS Final Report because the survey units incorporated within the reports are classified as non-impacted, and as such, no statistical tests, scan measurements, static measurements, or elevated measurement comparisons are required. The release of the non-impacted areas from the license was approved by the NRC on April 10, 2019.

1.2.2   Phase 2, 3, and 4 Final Status Survey Final Reports As discussed above, OPPD anticipates three additional FSSFR submittals. The schedule and identity of survey units included in each of the remaining submittals were developed based on a review of the demolition and FSS schedule, as well as in consideration of NRC review requirements. The demolition schedule, including the cleanup of demolition debris to allow survey access, is dynamic and subject to continued refinement. With potential changes in the decommissioning schedule, it is possible that interim submittals will be filed with the NRC with

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the goal of providing SURRs as soon as possible to support review and the potential release of site open lands.
The planned phases are as follows:
* Phase 2 - basement structures, embedded pipe, buried pipe, above-ground buildings, and open land
* Phase 3 - basement structures, embedded pipe, buried pipe, above-ground buildings, and open land
* Phase 4 - above-ground buildings and open land

2       Final Status Survey Program Overview Elements of the FSS Program consist of the methods used in planning, designing, conducting, and evaluating FSS at the FCS site to demonstrate that the premises are suitable for unrestricted use in accordance with the criteria for decommissioning in 10 CFR 20, Subpart E. FSSs serve as key elements to demonstrate that the TEDE to an AMCG from residual radioactivity does not exceed 25 mrem/yr, and that all residual radioactivity at the site is reduced to levels that are ALARA.
To implement the FSS Program, EnergySolutions established the License Termination/Final Status Survey (LT/FSS) Group, within the Radiation Protection division, with sufficient management and technical resources to fulfill project objectives. The LT/FSS Group is responsible for the safe completion of all surveys related to characterization and final site closure. Approved site procedures and detailed technical support documents (TSD) direct the FSS process to ensure consistent implementation and adherence to applicable requirements.
Figure 2-1 provides an organizational chart of the LT/FSS Group.

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Figure 2-1 License Termination/Final Status Survey Group Organizational Chart

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2.1     Survey Planning The FSS Program development and survey planning phases were initiated in 2019 by FCSD-RA-LT-200, Characterization Survey Plan (Reference 9) and the QAPP. The program was informed by the Historical Site Assessment for Fort Calhoun Station (Reference 10), which consisted of a review of site historical records regarding plant incidents, radiological survey documents, and routine and special reports submitted by Omaha Public Power District (OPPD) to various regulatory agencies. Along with these assessments, interviews with current and past site personnel, reviews of historical site photos, and extensive area inspections were performed to meet the following objectives:
* Develop the information necessary to support FSS design, including the development of data quality objectives (DQOs) and survey instrument performance standards.
* Develop the initial radiological information to support decommissioning planning, including building decontamination, demolition, and waste disposal.
* Identify any unique radiological or health and safety issues associated with decommissioning.
* Identify the potential and known sources of radioactive contamination in systems, surface or subsurface soils, groundwater, and on structures.
* Divide the FCS site into manageable survey units for survey and classification purposes.
* Determine the initial classification of each survey unit as non-impacted or impacted.
Impacted survey units are further designated as Class 1, 2, or 3, as defined in MARSSIM.
DQOs are qualitative and quantitative statements derived from the DQO process that clarify technical and quality objectives, define the appropriate type of data, and specify the tolerable levels or potential decision errors used as the basis for establishing the quality and quantity of data required to support inference and decisions. This process, described in MARSSIM and procedure FCSD-RA-LT-302, Final Status Survey Package Development, is a series of graded planning steps found to be effective in establishing criteria for data quality and guiding the development of FSS sample plans. DQOs developed and implemented during the initial phase of planning directed all data collection efforts.
The DQO approach consists of the following seven steps:
* State the Problem - This step provides a clear description of the problem, identification of planning team members (especially the decision makers), a conceptual model of the hazard to be investigated, and the estimated resources required to perform the survey.
The problem associated with FSS is to determine whether a given survey unit meets the radiological release criterion of 10 CFR 20.1402.
* Identify the Decision - This step consists of developing a decision statement based on a principal study question (i.e., the stated problem) and determining alternative actions that may be taken based on the answer to the principle study question. Alternative actions

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identify the measures to resolve the problem. The decision statement combines the principal study question and alternative actions into an expression of choice among multiple actions. For the FSS, the principal study question is: Does residual radioactive contamination present in the survey unit exceed the established DCGL values? The alternative actions may include investigation, resurvey, remediation, and reclassification.
* Identify Inputs to the Decision - The information required depends on the type of media under consideration (e.g., soil, water, or concrete) and whether existing data are sufficient or if new data are needed to make the decision. If the decision can be based on existing data, then the source(s) will be documented and evaluated to ensure reasonable confidence that the data are acceptable. If new data are needed, then the type of measurement (e.g., scan, direct measurement, or sampling) will need to be determined.
* Define the Study Boundaries - This step includes identification of the target population of interest, the spatial and temporal features of that population, the time frame for collecting the data, practical constraints, and the scale of decision making. In FSS, the target population is the set of samples or direct measurements that constitute an area of interest. The medium of interest is specified during the planning process. The spatial boundaries include soil depth, area dimensions, contained water bodies, and natural boundaries. Temporal boundaries include activities impacted by time-related events including weather conditions, season, operation of equipment under different environmental conditions, resource loading, and work schedule.
* Develop a Decision Rule - This step develops the binary statement that defines a logical process for choosing among alternative actions. The decision rule is a clear statement using the If...then... format and includes action level conditions and the statistical parameter of interest.
* Specify Tolerable Limits on Decision Errors - This step incorporates hypothesis testing and probabilistic sampling distributions to control the decision errors during data analysis. Hypothesis testing is a process based on the scientific method that compares a baseline condition (the null hypothesis) to an alternative condition (the alternative hypothesis). Hypothesis testing rests on the premise that the null hypothesis is true and that sufficient evidence must be provided to reject it in favor of the alternative hypothesis.
* Optimize the Design for Obtaining Data - The final step in the DQO process leads to the development of an adequate survey design. Gamma scans provide information on soil surfaces that have residual radioactivity greater than background and allow appropriate selection of biased sampling and measurement locations. This data was evaluated and used to refine the scope of field activities to optimize implementation of the FSS design and ensure the DQOs are met. For soil survey units, compliance with the release criteria is shown by obtaining soil samples at randomly chosen, systematic, and judgmental locations, depending on the classification.

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TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan (Reference 11) establishes the basis for an initial suite of potential radionuclides of concern (ROC) for decommissioning. Industry guidance was reviewed as well as the analytical results from the sampling of various media from past plant operations. An initial suite of radionuclides was prepared after the elimination of some of the theoretical neutron activation products, noble gases, and radionuclides with a half-life less than two years (with the exception of Ce-144). The initial suite is listed in Table 2-1.
Table 2-1     Initial Suite of Radionuclides

Radionuclide          Half Life (Years)          Radionuclide        Half Life (Years)
Am-241                 4.32E+02                   Fe-55               2.74E+00 C-14                 5.70E+03                    H-3                1.23E+01 Ce-144                0.78E+00                   Ni-59               1.01E+05 Cm-243                 2.85E+01                   Ni-63               1.00E+02 Cm-244                 2.85E+01                  Np-237               2.14E+06 Co-58                 0.19E+00                  Pu-238               8.77E+01 Co-60                 5.27E+00                  Pu-239               2.41E+04 Cs-134                2.06E+00                  Pu-240               6.60E+03 Cs-137                3.02E+01                  Pu-241               1.44E+01 Eu-152                1.35E+01                  Sb-125               2.76E+01 Eu-154                8.80E+00                   Sr-90               2.88E+01 Eu-155                4.76E+00                   Tc-99               2.11E+05

Insignificant contributors (IC) to dose were determined consistent with the guidance contained in Section 3.3 of NUREG-1757. LTP Chapter 6 discusses the process used to derive the dose significant ROC including the elimination of IC radionuclides from the initial suite. After eliminating the IC radionuclides in all soil, concrete, embedded pipe, and buried pipe scenarios the ROC were selected. For soil, the ROC were found to be Cs-137, Co-60, Eu-152, and C-14.
The IC radionuclides are eliminated from further detailed evaluation.
Characterization results determined that Cs-137 and Co-60 would be the primary ROC for the majority of survey design. All the FSS results provided in this report utilize Cs-137 as the primary ROC. Cs-137 and Co-60 characterization data for the survey units discussed in this report were used to determine the expected variability, number of samples required, and investigation levels for FSS design.
As stated, the primary objective of the DQO process was to demonstrate that the level of residual radioactivity found in the soils in the OLA survey units, including any areas of elevated activity,

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was equal to or below the site-specific DCGLs that correspond to the 25 mrem/yr release criterion.
The results of surface and subsurface soil characterization in the impacted areas at FCS show that there is minimal residual radioactivity in soil.
Surface soil is defined as soil residing in the first 0.15 m layer of soil. A subsurface soil category, which is defined as a layer of soil beginning at the surface but extending to a depth of 1 m is also assessed to allow for flexibility in compliance demonstration if contamination deeper than 0.15 m is encountered. Site-specific DCGLs for soil were calculated for both the 0.15 m and 1 m thicknesses. Based on characterization data and historical information, there are no expectations of encountering a source term geometry that is comprised of a clean surface layer of soil over a contaminated subsurface soil layer.

LTP Section 6.9 provides the exposure scenarios and modeling parameters that were used to calculate the site-specific soil DCGLs. Each radionuclide-specific base case derived concentration guideline level (BcDCGL) is equivalent to the level of residual radioactivity (above background levels) that could, when considered independently, result in a TEDE of 25 mrem/yr to an AMCG. To ensure that the summation of dose from each source term is 25 mrem/yr or less after all FSS is completed, the BcDCGLs are reduced based on an expected, or a priori, fraction of the 25 mrem/yr dose limit from each source term. These reduced values are designated as operational derived concentration guideline levels (OpDCGL) and are then used as the DCGL for the FSS design of the survey unit (  e.g., calculation of surrogate DCGLs, investigation levels). The OpDCGLs, in picocuries per gram (pCi/g) for surface and subsurface soil are provided in Table 2-2. The BcDCGLs for surface and subsurface soil are provided in

Table 2-3.
Table 2-2     OpDCGLs for Surface and Subsurface Soil

ROC           OpDCGLSS (0.15 m)       OpDCGLSB (1.0 m)
(pCi/g)                 (pCi/g)
C-14               1.59E+01                2.71E+00 Co-60               1.06E+00                8.21E-01 Cs-137              3.65E+00                2.04E+00 Eu-152              2.36E+00                2.06E+00

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Table 2-3      BcDCGLs for Surface and Subsurface Soil

ROC            BcDCGLSS (0.15 m)        BcDCGLSB (1.0 m)
(pCi/g)                 (pCi/g)
C-14               5.70E+01                 9.68E+00 Co-60               3.77E+00                 2.93E+00 Cs-137              1.31E+01                 7.27E+00 Eu-152               8.41E+00                 7.36E+00

The development of information to support decommissioning planning and execution was accomplished through a review of all known site radiological and environmental records. Much of this information was consolidated in the HSA, and in files containing copies of records maintained pursuant to Title 10 CFR 50.75(g) (1).
An initial objective of site characterization was to correlate the impact of a radiological event to physical locations on the FCS site and to provide a means to correlate subsequent survey data.
To satisfy these objectives, the entire 540-acre site was divided into survey units. Survey area size determination was based upon the specific area and the most efficient and practical size needed to bound the lateral and vertical extent of contamination identified in the area.
Classification, as described in MARSSIM, is the process by which an area or survey unit is described according to its radiological characteristics and potential for residual radioactivity.
Residual radioactivity could be evenly distributed over a large area, appear as small areas of elevated activity, or a combination of both. Therefore, the adequacy and effectiveness of the FSS process depends upon properly classified survey units to ensure that areas with the highest potential for contamination receive a higher degree of survey effort.
The suggested surface area limits provided in MARSSIM were used to establish the initial set of survey units for the LTP. A survey unit is a portion of a structure, buried pipe, or OLA that is surveyed and evaluated as a single entity following FSS. Survey units were delineated to physical areas with similar operational history or similar potential for residual radioactivity. To the extent practical, survey units were established with relatively compact shapes, and highly irregular shapes were avoided unless the unusual shape was appropriate for the site operational history or the site topography. For identification, survey units were assigned a four-digit number that could be further modified by a letter for future divisions if needed (i.e., if the classification changes then the corresponding survey unit size limitation changes). Physically, land survey unit boundaries were determined using commercially available mapping software with coordinates consistent with the Nebraska State Plane. Table 2-4 provides an outline for classification versus area size for survey units consistent with MARSSIM.
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Table 2-4      FCS Survey Unit Surface Area Limits

Survey Unit Type/Classification             Suggested Surface Area Limit Class 1:
Above-ground Structures (floor area)  100 m2 Land Areas                          2,000 m2 Basements (all surfaces combined)   2,000 m2 Class 2:
Above-ground Structures (floor area) 100 to 1,000 m2 Land Areas                         2,000 m2 to 10,000 m2 Basements (all surfaces combined)  2,000 m2 to 10,000 m2 Class 3:
Above-ground Structures (floor area) no limit Land Areas                         no limit Basements (all surfaces combined)  no limit Prior to FSS, each survey units classification is reviewed and verified in accordance with the LTP and its implementing procedures. A classification change to increase the class (e.g., Class 2 to Class 1) may be implemented without notification to regulatory authorities. However, a classification change to decrease the class (e.g., Class 1 to Class 2) may be implemented only after accurate assessment and approval from regulatory authorities as detailed in the LTP and its implementing procedures. Typically, reclassification occurs after the evaluation of continuing characterization results or emergent data indicates a more restrictive classification is required.
Final classification was performed in conjunction with the preparation of the FSS sample plans.
The sample plans reconcile legacy characterization data with more recent continuing characterization data to verify that the final classification is correct.

2.2     Survey Design FSSs for the FCS site are designed following procedures, the LTP, and MARSSIM guidance.
FSS design utilizes the combination of traditional scanning surveys, systematic or random measurement/sampling protocols, and investigative or judgmental methodologies to evaluate survey units relative to the applicable release criteria for open land.
Survey design objectives included a verification of the survey instruments ability to detect the radiations of interest relative to the DCGL. As standard practice to ensure that this objective was consistently met, portable radiation detection instruments used in FSS were calibrated on a yearly frequency with a National Institute of Standards and Technology (NIST) traceable source in accordance with procedures. Instruments were response checked before and after use.
Minimum detectable concentrations (MDC) were established and verified prior to FSS. Control

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and accountability of survey instruments were maintained and documented to assure quality and prevent the loss of data.
Based upon classification, a percentage of the surface area in the survey unit was selected and scanned with portable gamma radiation detection instruments. Information obtained during the survey was automatically logged by the instrument for review and analysis. Scan and measurement coordinates were identified using a random or systematic sample tool in Visual Sample Plan (VSP). Investigational samples or measurements were collected at areas of elevated scan readings. All details and instructions were incorporated into the survey units FSS sample plan. The recommended survey coverage based on survey unit classification is provided below in Table 2-5.
Table 2-5     Recommended Survey Coverage for FSS

Classification      Surface Scans         Soil Samples/Static Measurements Number of sample/measurement Class 1               100%            locations for statistical test, additional samples/measurements to investigate areas of elevated activity 10% to 100%,            Number of sample/measurement Class 2          Systematic and             locations for statistical test Judgmental Class 3            Judgmental            Number of sample/measurement locations for statistical test

The general approach prescribed by MARSSIM for FSS requires that at least a minimum number of measurements or samples be taken within a survey unit, so that the nonparametric statistical tests used for data assessment can be applied with adequate confidence. Decisions regarding whether a given survey unit meets the applicable release criterion are made based on the results of these tests.
All soil samples were sent to an off-site laboratory for hard-to-detect (HTD) analysis of C-14.
Laboratory DQO and analysis results were summarized in SURRs and reported as actual calculated results. Sample report summaries within the SURRs included unique sample identification, analytical method, radioisotope, result, uncertainty of two standard deviations, laboratory data qualifiers, units, and required MDCs.
Some portion of the radioactivity found in the soil samples is certainly attributed to fallout or background. Due to the lack of significant activity revealed during characterization, it was determined that background subtraction would not be applied during the FSS of OLA survey units.

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2.3     Survey Implementation Implementation of FSS in the Phase 1 survey units started in January 2022 and completed in November 2022. Implementation was the physical process of the FSS sample plan execution for a given survey unit. The tasks included in the implementation were:
* Verification and validation of personnel training
* Monitoring instrument calibration as detailed in FCSD-RA-LT-214, Calibration and Initial Set-Up of the Model 3001 and Associated Detectors (Reference 12)
* Implementation of applicable operating and health and safety procedures
* Implementation of isolation and control of the survey unit in accordance with FCSD-RA-LT-303, Final Status Survey Isolation and Control Measures
* Determination of the number of samples and measurements required to meet DQOs as described in, FCSD-RA-LT-302, Final Status Survey Sample Plan Development
* Determination of sample and measurement locations and creation of survey unit maps displaying the locations
* Proper techniques for collecting and handling FSS samples in accordance with FCSD-RA-LT-203, Sample Media Collection for Site Characterization and Final Status Survey (Reference 13)
* Maintaining quality assurance/quality control requirements (i.e., replicate/duplicate measurements or samples) in accordance with the QAPP
* Sample chain-of-custody maintained in accordance with FCSD-RA-LT-204, Sample Media Preparation for Site Characterization and Final Status Survey (Reference 14)
* Sample submission to approved laboratories in accordance with FCSD-RA-LT-205, Chain-of-Custody Protocol for Site Characterization and Final Status Survey (Reference 15)
* Application of the DCGLs to sample and measurement results in accordance with the data quality assessment (DQA) process as detailed in FCSD-RA-LT-304, Final Status Survey Data Assessment
* Determination of investigation methodology and corrective actions, if applicable The FSS of OLAs consisted of gamma scans performed at a frequency dependent on the classification followed by the collection of surface soil samples.
The FSS implementation and completion process resulted in the generation of field data and analysis data consisting of measurements taken with handheld radiation detecting equipment, observations noted in field logs, and radionuclide-specific analyses. Data were stored electronically on the common network with controlled accessibility.

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2.4     Survey Data Assessment Prior to proceeding with data evaluation and assessment, an LT/FSS Specialist ensured consistency between the data quality and the data collection process and the applicable requirements.
The DQA process is an evaluation method used during the assessment phase of FSS to ensure the validity of FSS results and demonstrate achievement with the FSS sample plan objectives. A key step in the data assessment process converts all of the survey results to DCGL units, if necessary.
The individual measurements and sample concentrations are compared to the OpDCGLs for evidence of small areas of elevated activity or results that are statistical outliers. When practical, graphical analyses of survey data that depicts the spatial correlation of the measurements were used.
For soil, the dose contribution from each ROC was accounted for using the sum of fractions (SOF) to ensure that the total dose from all ROC did not exceed the dose criterion. The SOF or unity rule was applied to the data used for the survey planning, and data evaluation and statistical tests since multiple radionuclide-specific measurements will be performed or the concentrations inferred based on known relationships. The application of the unity rule served to normalize the data to allow for an accurate comparison of the various data measurements to the release criteria. When the unity rule is applied, the DCGL (used for the nonparametric statistical test) becomes one.
For the soil survey units addressed by this final report, the survey data was evaluated using the Sign Test (as described in the LTP). The Sign Test is a one-sample statistical test that compares data directly to the release criteria. Combined with an effective sampling scheme, passing the Sign Test satisfies the release criteria. Selection of the Sign Test is prudent and conservative in the assumption that the radionuclides being considered are not present in background or are at levels at a small fraction of the applicable release criteria. Furthermore, any background contribution (e.g., Cs-137 from global fallout) in the sample increases the likelihood of failing the survey unit, which is conservative. If the release criteria were exceeded or if results indicated the need for additional data points, appropriate further actions were implemented, usually through the issue of an addendum to the FSS sample plan.

2.5     Quality Assurance and Quality Control Measures Quality assurance and control measures were employed throughout the FSS process to ensure that all decisions were based on data of acceptable quality. Quality assurance and control measures were applied to ensure:
* The FSS sample plan was correctly implemented.
* DQOs were properly defined and derived.
* The DQA process was used to assess results.

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* All data and samples were collected by individuals with the proper training and in adherence to approved procedures and sample plans.
* All instruments were properly calibrated.
* All collected data was validated, recorded, and stored in accordance with approved procedures.
* All required documents were properly maintained.
* Corrective actions were prescribed, implemented and tracked, as necessary.
Independent laboratories used for analysis of the samples collected during FSS maintain Quality Assurance Plans designed for their facility. The vendor plans were reviewed, as required by the QAPP, prior to selection of a laboratory for FSS sample analysis to ensure standards are acceptable.
The LT/FSS Group has undergone audits by OPPD Nuclear Oversight on a consistent basis throughout the project at FCS. The audits have scrutinized the LTP, LT/FSS procedures, sample plans, SURRs, and other LT/FSS records. The responses to the audits are captured in the Corrective Action Program.

3       Site Information

3.1     Site Description FCS Unit 1 was a Combustion Engineering 2-loop pressurized water reactor rated at nominal 533.7 megawatts electrical. The FCS site is located on the west bank of the Missouri River at river mile 646.0 on approximately 540 acres, approximately 19.4 miles north of Omaha, Nebraska. Figure 3-1 shows the geographical location of the site relative to nearby towns, cities, and the river. OPPD has a perpetual easement on approximately 117 acres of land primarily on the east bank of the river directly opposite the plant buildings.
On the southern part of the site, the ground rises sharply about 60 feet to a higher, level area which is bounded on the south by U.S. Highway 75, formerly U.S. Highway 73. Figure 3-2 shows the site boundaries, and Figure 3-3 shows the FCS site layout.
A majority of the site is being farmed at the present time and it is planned that farming will continue. On-site farming historically consisted primarily of grain, with approximately 354 acres under cultivation. To minimize soil disturbance during surveys, the farmland was plants to alfalfa in the fall of 2021. The area adjoining the site is farmland and sparsely populated. Cargill Industries property borders the FCS site to the northwest. The minimum exclusion distance is at a 1,525 feet radius circle centered on the former Auxiliary Building stack. The nearest privately owned land is farmland and is approximately 0.5 miles from the site. The nearest population center area of more than 25,000 is formed by adjacent cities of Omaha, Nebraska and Council Bluffs, Iowa.

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Figure 3-1  Site Regional Location

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Figure 3-2   FCS Site Boundaries

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Figure 3-3  FCS Site Layout

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The site is licensed under Possession Only License No. DPR-40 with Docket Number 50-285.
The spent nuclear fuel will be stored in the Independent Spent Fuel Storage Installation (ISFSI) which will be maintained under a 10 CFR Part 72 license, Certificate of Compliance No. 72-1004, and Docket No. 72-054. Key milestones during the life of the plant are:
* On May 15, 1984, a steam generator tube rupture due to intergranular stress corrosion cracking occurred during the hydrostatic pressure testing of the primary coolant system.
* In 1993, 2011, and again in 2019, the site experienced flooding events as a result of historic high Missouri River levels.
* On November 4, 2003, the NRC granted an operating license extension for an additional 20 years, to 2033.
* In the spring of 2011, flooding of the site caused an extended outage of the reactor.
* On June 24, 2016, and updated on August 25, 2016, OPPD submitted the Certifications of Permanent Cessation of Power Operations in accordance with 10 CFR Part 50.82(a)(i).
* On October 24, 2016, the reactor was shut down for the final time, thus initiating the decommissioning process.
* On November 13, 2016, the final reactor fuel off-load was completed.
* On October 11, 2018, the OPPD Board authorized the move toward decommissioning FCS in accordance with the DECON alternative.
* On April 10, 2019, the partial site release of the non-impacted OLAs was approved.
* On May 13, 2020, transfer of the spent nuclear fuel to the ISFSI was completed.

3.2     Survey Unit Description The following information is a description of each survey unit at the time of FSS.
Survey Unit 8101 8101 is an impacted Class 3 OLA survey unit. The survey unit consists of surface soil within a portion of the North Owner Controlled Area (OCA). The size of this survey unit is 99,210 m2.

Survey Unit 8102 8102 is an impacted Class 3 OLA survey unit. The survey unit consists of surface soil within a portion of the North OCA. The size of this survey unit is 74,685 m2.

Survey Unit 8103 8103 is an impacted Class 3 OLA survey unit. The survey unit consists of surface soil within a portion of the North OCA. The size of this survey unit is 58,497 m2.

Survey Unit 8104 8104 is an impacted Class 3 OLA survey unit. The survey unit consists of surface soil within a portion of the North OCA. The size of this survey unit is 99,971 m2.

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Survey Unit 8105 8105 is an impacted Class 3 OLA survey unit. The survey unit consists of surface soil within a portion of the North OCA. The size of this survey unit is 99,994 m2.

Survey Unit 8106 8106 is an impacted Class 3 OLA survey unit. The survey unit consists of surface soil within a portion of the North OCA. The size of this survey unit is 99,788 m2.

Survey Unit 8109 8109 is an impacted Class 3 OLA survey unit. The survey unit consists of surface soil within a portion of the North OCA. The size of this survey unit is 98,266 m2.

Survey Unit 8110 8110 is an impacted Class 3 OLA survey unit. The survey unit consists of surface soil within a portion of the North OCA. The size of this survey unit is 105,611 m2.

Survey Unit 8202 8202 is an impacted Class 3 OLA survey unit. The survey unit consists of surface soil within a portion of the West OCA. The size of this survey unit is 54,169 m2.

Survey Unit 8203 8203 is an impacted Class 3 OLA survey unit. The survey unit consists of surface soil within a portion of the West OCA. The size of this survey unit is 99,184 m2.

Survey Unit 8305 8305 is an impacted Class 3 OLA survey unit. The survey unit consists of surface soil within a portion of the South OCA. The size of this survey unit is 98,059 m2.

Survey Unit 8307 8307 is an impacted Class 3 OLA survey unit. The survey unit consists of surface soil within a portion of the South OCA. The size of this survey unit is 90,659 m2.

3.3     Summary of Historical Radiological Data The site historical radiological data for this Phase 1 FSSFR at FCS incorporates the results of the HSA issued in 2020 and characterization surveys completed in 2020.

3.3.1   Historical Site Assessment The HSA is a detailed investigation that collects existing information (from the start of FCS activities related to radioactive materials or other contaminants) for the site and its surroundings.
The HSA focuses on historical events and routine operational processes that resulted in

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contamination of plant systems, on-site buildings, surface soils, and subsurface soils within the OCA. The information compiled by the HSA was used, in conjunction with FCSD-RA-LT-200, Characterization Survey Plan, to establish initial survey units and their MARSSIM classifications. This information was used as input into the development of site-specific DCGLs, remediation plans, and the design of the FSS. The scope of the HSA included potential contamination from radioactive materials, hazardous materials, and other regulated materials.
The objectives of the HSA are to:
* identify potential, likely, or known sources of radioactive and chemical contaminants based on existing or derived information,
* distinguish portions of the site that may need further action from those that pose little or no threat to human health,
* provide an assessment of the likelihood of contaminant migration,
* provide information useful to subsequent characterization surveys,
* provide a graded initial classification for impacted soils and structures in accordance with MARSSIM guidance, and
* delineate initial survey unit boundaries and areas based upon the initial classification.
All 12 OLA survey units detailed in this report were designated Class 3 based on process knowledge and their location relative to facility buildings.

3.3.2   Characterization Surveys Site characterization of FCS was performed in accordance with FCSD-RA-LT-200, Characterization Survey Plan, which was developed to provide guidance and direction to the personnel responsible for implementing and executing characterization survey activities. The Characterization Survey Plan worked in conjunction with implementing procedures and survey unit specific survey instructions (sample plans) that were developed to safely and effectively acquire the requisite characterization data.
Characterization data acquired through the execution of the Characterization Survey Plan was used to meet three primary objectives:
* Provide radiological inputs necessary for the design of FSS.
* Develop the required inputs for the LTP.
* Support the evaluation of remediation alternatives and technologies and estimate waste volumes.
The final output of the initial site characterization is FC-20-012, Fort Calhoun Station Decommissioning Project Radiological Characterization Report   (Reference 16) and Chapter 2 of the LTP.

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Additionally, the statistical quantities for Cs-137 and Co-60 from the characterization samples are provided in each of the subject SURRs (see Appendices A1 through A12).

3.4     Conditions at the Time of Final Status Survey The open land survey units in this report had little to no disturbance occurring since the shut-down of FCS. In OLA survey units, depending on the time of survey, the soil was damp from melted snow, and several small patches of un-melted snow were still present in the areas.
Additionally, the OLA survey units were sparsely covered in dry grass and bushes. The snow and vegetation were deemed sparse enough as to not be a considerable constraint for the collection of samples and scan measurements.
Prior to FSS, areas ready for survey were isolated and controlled under FCSD-RA-LT-303, Final Status Survey Isolation and Control Measures. This included posting of the area as well as notifications to site personnel. Permission must be obtained from LT/FSS staff to enter and work in these areas. Posting of the boundaries controls personnel access, and a routine surveillance program monitors for any inadvertent personnel access with procedurally defined recovery and reporting protocols in the event of any impact to these survey units final status.

3.5     Identification of Potential Contaminants LTP Chapter 2 provides detailed characterization data that describes current contamination levels in the basements and soils from the characterization campaign conducted from in 2019 and 2020.
Surface and subsurface soil samples were taken in each impacted open land survey unit (including soil beneath and adjacent to basements) and analyzed for the presence of plant-derived radionuclides.
TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan establishes the basis for an initial suite of potential ROC for decommissioning. Industry guidance was reviewed as well as the analytical results from the sampling of various media from past plant operations. An initial suite of radionuclides was prepared after the elimination of some of the theoretical neutron activation products, noble gases, and radionuclides with a half-life less than two years (with the exception of Ce-144). The initial suite is listed in Table 2-1.
IC were determined consistent with the guidance contained in Section 3.3 of NUREG-1757. LTP Chapter 6 discusses the process used to derive the dose significant ROC including the elimination of IC radionuclides from the initial suite. After eliminating the IC radionuclides in all soil, concrete, embedded pipe, and buried pipe scenarios the ROC were selected. For soil, the ROC were found to be Cs-137, Co-60, Eu-152, and C-14. The IC radionuclides are eliminated from further detailed evaluation.

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3.6     Radiological Release Criteria

All FSSs for the survey units detailed in this report were conservatively designed to the OpDCGLs for soil, and all results were compared to these values. However, since the release criteria were based on the BcDCGL, surpassing the OpDCGL did not disqualify a survey unit from meeting the release criteria provided that the data passed the Sign Test and the BcDCGL was not exceeded. The OpDCGLs and BcDCGLs for soil are provided in Table 2-2 and

Table 2-3, respectively.

4       Final Status Survey Protocol

4.1     Data Quality Objectives The DQO process as outlined in Section 2 of this report was applied for each FSS sample plan and contains basic elements common to all FSS sample plans at FCS. An outline of those elements presented in the sample plans are as follows:
State the Problem The problem: To demonstrate that the level of residual radioactivity in a survey unit does not exceed the release criteria of 25 mrem/yr TEDE and that the potential dose from residual radioactivity is ALARA.
Stakeholders: The primary stakeholders interested in the answer to this problem are OPPD and the U.S. Nuclear Regulatory Commission (NRC).
The Planning Team: The planning team consisted of the assigned LT/FSS Specialist with input from other LT/FSS personnel as well as the Safety Department. The primary decision maker was the LT/FSS Manager.
Schedule: The approximate time projected to mobilize, implement, and asses an FSS unit was between 4 and 10 days.
Resources: The following resources were necessary to implement an FSS sample plan:
* LT/FSS Specialist to prepare the plan and evaluate data.
* LT/FSS Supervisor to monitor and coordinate field activities.
* Graphics/CAD/GIS Specialist to prepare survey maps, layout diagrams, composite view drawings, and other graphics as necessary to support survey design and reporting.
* LT/FSS Technicians to perform survey activities, collect survey measurement data, and collect media samples.
* Laboratory staff to analyze samples.

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Identify the Decision Principal Study Question: Are the residual radionuclide concentrations found in the soil equal to or below site-specific DCGLs?
Alternate Actions: Alternative actions include failure of the survey unit, remediation, reclassification, and resurvey.
The Decision: If the survey unit fails to demonstrate compliance with the release criteria, then the survey unit is not suitable for unrestricted release. The DQA process is reviewed to identify the appropriate additional action or combination of actions.
Identify Inputs to the Decision Information Needed: The survey unit requires an evaluation of residual activity and its surface area. The HSA and characterization surveys were preliminary sources of information for FSS; however, the results were not sufficient to provide the current as-left radiological conditions.
New measurements of sample media are needed to determine the concentration and variability for those radionuclides potentially present at the site at the time of FSS. For the OLA survey units, gamma scans are needed to identify areas of elevated activity and volumetric sampling of bulk materials (e.g., soil, sediment, asphalt) are needed as compliance measurements.
Historical Information: The classification as originally identified in the HSA and the verification of that classification during characterization. A summary of site processes or incidents that occurred in the survey unit.
Radiological Survey Data: The current radiological survey data from characterization. This information is used to develop a sample size for FSS.
Radionuclides of Concern: The ROC are Cs-137, Co-60, Eu-152, and C-14.
Basis for the Action Level: The investigation and action levels for FSS were selected in accordance with Table 5-24 of the LTP, recreated below as Table 4-1.
Table 4-1      FSS Investigation Levels

Classification          Scan Investigation Levels              Direct Investigation Levels
                                                                          >DCGLEMC or Class 1                     >DCGLEMC                      >Operational DCGL and
                                                                     >a statistical parameter-based value Class 2         >Operational DCGL or >MDCscan if            >Operational DCGL MDCscan is greater than Operational DCGL Class 3         >Operational DCGL or >MDCscan if          >0.5 Operational DCGL MDCscan is greater than Operational DCGL

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Investigation Levels: Table 4-1 provides the investigation levels for the Phase 1 survey units.
Define the Boundaries of the Survey Boundaries of the Survey: The actual physical boundaries as stated for each survey unit.
Temporal Boundaries: Estimated times and dates for the survey. Scanning and sampling in a survey unit was normally performed only during daylight and dry weather.
Constraints: The most common constraints were the weather, temperature, and water intrusion.
Develop a Decision Rule Decision Rule: If any measurement data exceeded the action levels specified in the survey plans, alternative actions would be taken.
Specify Tolerable Limits on Decision Errors The Null Hypothesis: Residual radioactivity in the survey unit exceeds the release criteria.
Type I Error: This is also known as the  error. This is the error associated with incorrectly concluding the null hypothesis has been rejected. In accordance with LTP Section 5.2.1.6, the error was set at 0.05 (5%).
Type II Error: This is also known as the  error. This is the error associated with incorrectly concluding the null hypothesis has been accepted. In accordance with LTP Section 5.2.1.6, the error was set at 0.05 (5%).
The Lower Bound of the Gray Region (LBGR): Typically, the LBGR was set at the mean SOF of the characterization data.
Sigma: The standard deviation was determined based on characterization data.
Optimize Design Type of Statistical Test: The Sign Test was selected as the nonparametric statistical test for FSS.
The Sign Test is conservative as it increases the probability of incorrectly accepting the null hypothesis (i.e., the conclusion will be that the survey unit does not meet the release criteria) and does not require the selection or use of a background reference area.
Number of Measurements/Samples Required for the Sign Test: All Phase 1 OLA survey units had a relative shift of greater than three and were subsequently adjusted to three, which corresponds to 14 random samples for use with the Sign Test. The locations of the samples and measurements were determined using the software VSP.
Number of Judgmental Measurements/Samples and Locations: Typically, a minimum of one (1) judgmental sample or measurement was required in each Phase 1 survey unit. The selection of additional judgmental samples or measurements was at the discretion of the LT/FSS Supervisor.
Locations chosen for judgmental investigation were usually areas of interest (e.g., low points,

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soil disturbances). The In Situ Object Counting System (ISOCS) was utilized for investigation in several survey units.
Number of Scan Areas and Locations: For Class 3 survey units, a minimum of 5% of the accessible surface area was scanned. For Class 3 OLA survey units, scan locations were biased to areas with more contamination potential (e.g., low points, soil disturbances). Additional scans were performed at the locations of judgmental measurements.
Number of Measurements/Samples for Quality Control (QC): The implementation of QC measures as referenced by LTP Section 5.6.3 and the QAPP included the collection of split samples, duplicate samples, and/or replicate scan measurements, as appropriate, at a frequency of 5% of the measurement/sample set. The locations for replicate measurements/samples were selected randomly using a random number generator.
Power Curve: The Prospective Power Curve, developed using characterization data and MARSSIM Power 2000, showed adequate power for the survey design in each of the survey units.

4.2     Survey Unit Designation and Classification FCSD-RA-LT-301, Survey Unit Classification (Reference 17), defines the decision process for classifying an area in accordance with the LTP and MARSSIM. During the FSS of areas submitted for this Phase 1 FSSFR, no survey units were reclassified.

4.3     Background Determination During the gamma scanning, ambient background was determined by taking the average of five background readings and establishing the alarm set point based on the background value for each scan area.
Each SURR (enclosed as appendices to this report) discusses background determination in further detail.

4.4     Final Status Survey Sample Plans The level of effort associated with planning a survey is based on the complexity of the survey unit and nature of the hazards. Guidance for preparing FSS plans of OLA survey units is provided in FCSD-RA-LT-302, Final Status Survey Sample Plan Development. The FSS sample plans for all Phase 1 survey units use an integrated sample design that combines scanning surveys and media samples.

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4.5     Survey Design

4.5.1   Determination of Number of Data Points The number of soil samples for the FSS of OLA survey units was determined in accordance with FCSD-RA-LT-302, Final Status Survey Sample Plan Development and MARSSIM. The relative shift (/) for the survey unit data set is defined as shift (), which is the upper bound of the gray region (UBGR), or the DCGL, minus the LBGR, divided by sigma (), which is the standard deviation of the data set used for survey design. As the calculated relative shift for all OLA survey units was greater than three, a value of three was used. The sample size from Table 5.5 in MARSSIM that equates to  and  errors of 0.05 and a relative shift of 3 is 14. A breakdown of the samples collected for the Phase 1 survey units is provided in Table 4-2.
Table 4-2     Number of Samples for FSS

Judgmental Samples Survey Unit    Random Samples          or Measurements

8101                14                      33 8102                14                      21 8103                14                      27 8104                14                      13 8105                14                      23 8106                14                      7 8109                14                      38 8110                14                      35 8202                14                      43 8203                14                      35 8305                14                      28 8307                14                      33

4.5.2   Sample Locations Locations of the samples and measurements were determined using the VSP software. For OLAs, VSP software imports a topographical map of the selected survey area and designates the sample locations with coordinates and bearings based on the Nebraska State Plane System. The VSP software designated the measurement locations with coordinates based on a local origin established on the drawing (an x, y system in meters). Pacific Northwest National Laboratory created VSP for the United States Department of Energy. For those locations where access was impractical or unsafe, alternate sample locations were generated and documented. Sample locations were identified using GPS coordinates and are consistent with the Nebraska State Plane

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System. Once located, sample points were physically marked and graphically plotted using drafting software.

4.6     Instrumentation Radiation detection and measurement instrumentation for performing FSS is selected to provide both reliable operation and adequate sensitivity to detect the ROC identified at the site at levels sufficiently below the OpDCGL. Detector selection is based on detection sensitivity, operating characteristics, and expected performance in the field.
The DQO process includes the selection of instrumentation appropriate for the type of measurement to be performed and that are calibrated to respond to a radiation field under controlled circumstances. Instruments are also evaluated periodically for adequate performance to established quality standards and ensure that they are sensitive enough to detect the ROC with a sufficient degree of confidence. For example, when determining instrument minimum detectable count rate (MDCR), an index of sensitivity (d) of 1.38 was used to provide a detection rate of 95% and a false positive rate of 60%.
The field instrumentation will, to the extent practicable, use data logging to automatically record measurements to minimize transcription errors.
Specific implementing procedures control the issuance, use, and calibration of instrumentation used for FSS. The specific DQOs for instruments are established early in the planning phase for FSS activities, implemented by standard operating procedures and executed in the FSS sample plan.

4.6.1   Detector Efficiencies The Ludlum Model 3001 Data Logger coupled with the Ludlum Model 44-20 NaI detector were selected as the primary radiation detection instrumentation for performing scanning in OLA survey units. Instrument efficiencies (i) are derived from the surface emission rate of the radioactive source(s) used during the instrument calibration. Total efficiency (t) is calculated by multiplying the instrument efficiency (i) by the surface efficiency (s) commensurate with the radionuclides beta energy using the guidance provided in ISO 7503-1, Part 1, Evaluation of Surface Contamination, Beta-emitters (maximum beta energy greater than 0.15 MeV) and alpha-emitters (Reference 18).

4.6.2   Detector Sensitivities The evaluation of OLAs requires a detection methodology of sufficient sensitivity for the identification of small areas of potentially elevated activity. Scanning measurements are performed by passing a hand-held detector, primarily the Ludlum Model 44-20 NaI detector, in gross count rate mode across the land surface under investigation. The centerline of the detector was maintained at the ground to detector distance detailed in the sample plan and moved from

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side to side in typically a 0.5-meter wide pattern at a rate of 0.25 m/sec. The audible and visual signals were monitored for detectable increases in count rate. An observed count rate increase resulted in further investigation to verify findings and to define the level and extent of residual radioactivity.
An a priori determination of scanning sensitivity was performed to ensure that the measurement system (including the surveyor) was able to detect concentrations of radioactivity at levels below the regulatory release limit. The specified performance level and surveyor efficiency was expressed in terms of scan MDCR. This sensitivity is the lowest count rate that can be reliably detected at any given background by the measurement system. The specified MDCR correlates to the targeted MDC.
This approach represents the surface scanning process for land areas defined in NUREG -1507, Minimum Detectable Concentrations with Typical Radiation Survey Instruments for Various Contaminants and Field Conditions (Reference 19). The gamma scan MDCR is discussed in detail in FC-19-006, Ludlum Model 44-10 Detector Sensitivity (Reference 20) which examines the gamma sensitivity for a 5.08 by 5.08 cm (2 x 2) NaI detector to several radionuclide mixtures of Co-60 and Cs-137 using sand (SiO2) as the soil base. FC-19-006, Ludlum Model 44-10 Detector Sensitivity derives the MDCR for the radionuclide mixtures at various detector distances and scan speeds. The model in FC-19-006, Ludlum Model 44-10 Detector Sensitivity uses the same geometry configuration as the model used in MARSSIM.
FC-19-006, Ludlum Model 44-10 Detector Sensitivity provides MDCR values for the expected FCS soil mixture based on detector background condition, scan speed, soil depth (0.15 meters),
soil density (1.6 g/cm3), and detector distance to the surface of interest.

4.6.3   Instrument Maintenance and Control Control and accountability of survey instruments were maintained to assure the quality and prevent the loss of data. All personnel operating radiological instruments, analysis equipment, measurement location equipment, etc., were qualified to operate any assigned equipment and recognize irregular results and indications.

4.6.4   Instrument Calibration Instruments and detectors were calibrated for the radiation types and energies of interest or to a conservative energy source. Instrument calibrations were documented with calibration certificates and/or forms and maintained with the instrumentation and project records.
Calibration labels were also attached to all portable survey instruments. Prior to using any survey instrument, the current calibration was verified and all operational checks were performed.
Instrumentation used for FSS was calibrated and maintained in accordance with approved site calibration procedures. Radioactive sources used for calibration were traceable to the NIST and were obtained in standard geometries to match the type of samples being counted. When a

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characterized high-purity germanium (HPGe) detector was used, suitable NIST-traceable sources were used for calibration, and the software was set up appropriately for the desired geometry. If vendor services were used for instrument calibration or repair, these services were obtained in accordance with purchasing requirements for quality related services, to ensure the same level of quality.

4.7     Survey Methodology

4.7.1   Scan Surveys The LTP specifies the minimum amount of scanning required for each survey unit classification as summarized in Table 2-5. The total fraction of scanning coverage is determined during the DQO process with the amount and location(s) based on the likelihood of finding elevated activity during FSS.
LTP Section 5.3.4 states that for Class 3 survey units, judgmental surface scans will typically be performed on areas with the greatest potential of contamination and that for open land areas, this will include surface drainage areas and collection points. For Class 3 survey units, scan locations were also biased to high traffic areas such as roadways and pathways. Additionally, scanning was performed around each sampling location. This allowed for the scanned areas to be evenly distributed throughout the survey unit.
During the scanning, the technician recorded data and observations in a field log. This log documented field activities, anomalies and other information pertaining to the survey. Table 4-3 provides a summary of the total area scanned for the Phase 1 survey units Table 4-3      Summary of Total Area Scanned for Phase 1 Survey Units

Survey Unit      Area         Area Survey Unit      Classification    (m2)       Scanned       % Scan (m2) 8101               3          99,210        9,921          10 8102               3          74,685        7,469          10 8103               3          58,497        5,850          10 8104               3          99,971        9,997          10 8105               3          99,994        9,994          10 8106               3          99,788        9,979          10 8109               3          98,266        9,827          10 8110               3         105,611       10,561          10 8202               3          54,169        5,417          10 8203               3          99,184        9,918          10

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Survey Unit      Area         Area Survey Unit      Classification   (m2)        Scanned      % Scan (m2) 8305               3         98,059        9,806          10 8307               3         90,659        9,066          10

4.7.2   Soil In accordance with the FSS sample plan and applicable procedures, LT/FSS Technicians collected surface soil samples at locations specified by the survey design. Each sample location was documented, along with soil conditions and observations, and a chain-of-custody was developed to maintain sample integrity.

4.8     Quality Control Surveys The method used for evaluating QC split/duplicate samples and replicate measurements collected in support of the FSS program is specified in the QAPP. QC split/duplicate and replicate data was assessed using criteria taken from NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual (MARLAP) (Reference 21). A minimum of 5% of the sample and measurement locations used in the FSS design were selected randomly for QC evaluation using a random number generator.
Most soil split samples taken for FSS were field duplicates; that is, samples obtained from one location, homogenized, divided into separate containers, and treated as separate samples. QC split samples and replicate measurements were used to assess errors associated with sample/measurement heterogeneity, sample/measurement methodology, and analytical procedures. It is desirable that when analyzed, there is agreement between the split samples and replicate measurements to their respective standard sample or measurement, resulting in data acceptance. If there was no agreement, the LT/FSS Specialist or LT/FSS Manager evaluated the magnitude and impact on survey design, the implementation and evaluation of results, as well as the need to perform confirmatory sampling. If the LT/FSS Specialist or LT/FSS Manager had determined that the discrepancy affected quality or was detrimental to the implementation of FSS, then a Condition Report (CR) would have been issued.
No CRs were issued as there was either an acceptable agreement between standard and comparison measurements in every Phase 1 survey unit. Results of QC assessments are provided as attachments in each of the SURRs which are attached as appendices to this report.
To maintain the quality of the FSS, isolation and control measures were implemented prior to, during, and upon completion of FSS until there was no risk of recontamination. Periodic surveillances were performed which consisted of an inspection of area postings, and an inspection of the area for signs of excavation, dumping, or disturbance. In the event that isolation and control measures were compromised, a follow-up survey may be performed after evaluation.

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FINAL STATUS SURVEY FINAL REPORT - PHASE 1

5       Survey Findings FCSD-RA-LT-304, Final Status Survey Data Assessment provides guidance to LT/FSS personnel to interpret survey results using the DQA process during the assessment phase of FSS activities. The DQA process is the primary evaluation tool to determine that data is of the right type, quality and quantity to support the objectives of the FSS sample plan. The five steps of the DQA process are:
* Review the sample plan DQOs and the survey design.
* Conduct a preliminary data assessment.
* Select the statistical test.
* Verify the assumptions of the statistical test.
* Draw conclusions from the data.
Data validation descriptors described in MARSSIM Table 9.3 were used during the DQA process to verify and validate collected data as required by the QAPP.

5.1     Survey Data Conversion During the data conversion, the LT/FSS Specialist evaluated raw data for problems or anomalies encountered during sample plan activities (sample collection and analysis, handling and control, etc.) including the following:
* Recorded data
* Missing values
* Deviation from established procedure
* Analysis flags Once resolved, initial data conversion, which is part of preliminary data assessment, was performed and consisted of converting the data into units relative to the release criteria (e.g.,
pCi/g) and calculating basic statistical quantities (e.g., mean, median, standard deviation). Table 5-1 provides a summary of the basic statistical properties in the Phase 1 random sample populations.
Table 5-1      Basic Statistical Properties of Phase 1 Random Sample Populations

Radionuclide Statistical Summary (pCi/g)
Survey Unit    Class   Samples                Cs-137                             Co-60 Max         Mean      Std. Dev. Max        Mean     Std. Dev.
8101          3       14       2.44E-01   1.30E-01    7.55E-02    2.84E-01  6.35E-02    7.59E-02 8102          3       14       2.35E-01   7.50E-02    6.86E-02    1.36E-01  6.01E-02    4.98E-02 8103          3       14       2.71E-01   1.42E-01    7.44E-02    1.22E-01  4.62E-02    3.40E-02 8104          3       14       3.64E-01   2.21E-01    9.72E-02    1.46E-01  6.84E-02    4.63E-02 8105          3       14       3.12E-01   1.79E-01    7.00E-02    1.58E-01  6.51E-02    5.33E-02

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Radionuclide Statistical Summary (pCi/g)
Survey Unit     Class   Samples                 Cs-137                              Co-60 Max        Mean       Std. Dev. Max        Mean      Std. Dev.
8106           3       14       3.12E-01    1.15E-01    9.73E-02    1.27E-01   3.05E-02    4.13E-02 8109           3       14       2.37E-01    1.01E-01    8.93E-02    2.13E-01   6.08E-02    7.36E-02 8110           3       14       1.67E-01    5.59E-02    5.37E-02    1.81E-01   5.43E-02    5.16E-02 8202           3       14       4.61E-01    1.91E-01    1.24E-01    2.16E-01   7.01E-02    5.83E-02 8203           3       14       3.51E-01    1.68E-01    8.36E-02    1.78E-01   5.11E-02    5.73E-02 8305           3       14       2.65E-01    1.24E-01    6.83E-02    9.93E-02   4.63E-02    2.88E-02 8307           3       14       1.85E-01    6.85E-02    6.46E-02    1.85E-01   7.01E-02    5.61E-02 Table 5-2 provides a summary of the basic statistical properties for the Phase 1 judgmental sample/measurement populations.
Table 5-2       Basic Statistical Properties of Phase 1 Judgmental Sample/Measurement Populations

Samples/                  Radionuclide Statistical Summary (pCi/g)
Survey Unit     Class   Measure                 Cs-137                              Co-60 ments      Max         Mean       Std. Dev. Max        Mean       Std. Dev.

8101           3        33      2.26E-01   5.40E-02     6.09E-02    1.78E-01   7.13E-02    5.28E-02 8102           3        21      1.86E-01   7.26E-02     5.61E-02    1.60E-01   6.39E-02    4.64E-02 8103           3        27      4.80E-01   2.07E-01     1.06E-01    3.26E-01   7.99E-02    8.35E-02 8104           3        13      2.27E-01   1.65E-01     3.02E-02    1.42E-01   6.73E-02    4.49E-02 8105           3        23      2.66E-01   1.60E-01     5.23E-02    1.43E-01   6.18E-02    3.97E-02 8106           3        7       1.53E-01   9.85E-02     4.27E-02    1.09E-01   5.64E-02    3.38E-02 8109           3        38      5.25E-01   1.25E-01     1.25E-01    2.13E-01   6.46E-02    5.35E-02 8110           3        35      1.34E-01   4.73E-02     4.46E-02    1.33E-01   4.33E-02    3.71E-02 8202           3        43      3.19E-01   1.38E-01     6.35E-02    2.11E-01   5.38E-02    5.66E-02 8203           3        35      2.32E-01   1.23E-01     5.13E-02    1.99E-01   7.77E-02    6.08E-02 8305           3        28      4.76E-01   1.81E-01     1.13E-01    2.40E-01   7.01E-02    7.56E-02 8307           3        33      2.28E-01   7.36E-02     6.29E-02    2.09E-01   7.48E-02    6.11E-02

5.2     Survey Data Verification and Validation Items supporting DQO sample design and data are reviewed for completeness and consistency.
This includes the following:
* Classification history and related documents
* Site description
* Survey design and measurement locations

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FINAL STATUS SURVEY FINAL REPORT - PHASE 1
* Analytic method and detection limits and that the required analytical methods are adequate for the radionuclides of concern
* Sampling variability provided for the radionuclides of interest
* QC measurements have been specified
* Survey and sampling result accuracy have been specified
* MDC limits
* Field conditions for media and environment
* Field records Documentation, as listed, is reviewed to verify completeness and that it is legible:
* Field and analytical results
* Chain-of-custody
* Field logs
* Instrument issue, return and source check records
* Instrument downloads
* Measurement results relative to measurement location After completion of these previously mentioned tasks, a Preliminary Data Assessment record was initiated. This record served to verify that all data are in standard units in relation to the DCGLs and requires the calculation of the statistical parameters needed to complete data evaluation which at a minimum, included the following:
* The number of observations (i.e., samples or measurements)
* The range of observations (i.e., minimum and maximum values)
* Mean
* Median
* Standard deviation In order to adequately evaluate the data set, consideration of additional options included the coefficient of variation, measurements of relative standing (such as percentile), and other statistical applications as necessary (frequency distribution, histograms, skew, etc.). Finalization of the data review consisted of graphically displaying the data in distributions and percentiles plots.

5.3     Anomalous Data/Elevated Scan Results and Investigation In the Phase 1 survey units combined, elevated scan readings resulted in the collection of 336 judgmental samples or measurements. This process was documented in accordance with FCSD-RA-LT-304, Final Status Survey Data Assessment. All judgmental samples/measurements had a SOF of less than one when compared to the OpDCGLs; therefore, use of the area-weighted

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approach was not necessary. No judgmental samples or measurements resulted in the remediation and/or reclassification of a survey unit.
No anomalies were observed in Phase 1 survey units during the FSS.

5.4    Evaluation of Number of Measurement Locations in Survey Units An effective tool utilized to evaluate the number of samples collected in the sampling scheme is the Retrospective Power Curve generated by MARSSIM Power 2000. The Retrospective Power Curve shows how well the survey design achieved the DQOs. For reporting purposes, all release records include a Retrospective Power Curve analysis indicating that the sampling design had adequate power to pass the FSS release criteria (i.e., an adequate number of samples was collected).

5.5    Comparison of Findings with Derived Concentration Guideline Levels As previously described in Section 2.4, the SOF or unity rule was applied to FSS data obtained in OLA survey units in accordance with the guidance provided in Section 2.7 of NUREG-1757, Vol. 2, and the LTP. This was accomplished by calculating a fraction of the OpDCGL for each measurement by dividing the reported concentration by the OpDCGL.
A base case SOF (BcSOF) was calculated for each ROC by dividing the reported concentration by the BcDCGL. A BcSOF of one is equivalent to the decision rule, meaning any measurement with a BcSOF of one or greater, would not meet the 25 mrem/yr release criteria. The mean BcSOF was multiplied by 25 to establish the dose attributed to a survey unit.
The dose from elevated judgmental or investigational measurements (measurements exceeding SOF of one when compared to the OpDCGL) is accounted for using an area-weighted approach.
An area-weighted SOF is calculated and added to the average systematic measurement SOF. The product of this summation is then used to calculate the overall dose assigned to the survey unit.
During the FSS of all Phase 1 survey units, no judgmental or investigational measurements exceeded the SOF of one when compared to the OpDCGL.
A summary of the Mean BcSOF and dose contribution for each Phase 1 survey unit is provided in Table 5-3.
Table 5-3     Mean BcSOF and Dose Contribution Survey Unit     Mean BcSOF           Dose (mrem/yr) 8101            0.0374           0.9361 8102            0.0296           0.7404 8103            0.0263           0.6575 8104            0.0503           1.2572

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Survey Unit     Mean BcSOF            Dose (mrem/yr) 8105             0.0388           0.9697 8106             0.0277           0.6913 8109             0.0303           0.7576 8110             0.0218           0.5449 8202             0.0418           1.0442 8203             0.0361           0.9026 8305             0.0245           0.6115 8307             0.0244           0.6096

5.6     Description of ALARA to Achieve Final Activity Levels Section N.3.6 of NUREG-1757, Vol. 2, states that For residual radioactivity in soil at sites that may have unrestricted release, generic analyses . . . show that shipping soil to a licensed low-level waste disposal facility is unlikely to be cost effective for unrestricted release, largely because of the high costs of waste disposal. . . . Therefore, the licensee generally does not have to evaluate shipping soil to a low-level waste disposal facility to achieve exposure levels at or below the criterion for unrestricted release. Section 4.4.1 of the LTP presents a simple ALARA analysis for the excavation and disposal of soils as low-level radioactive waste that confirms the statement in Section N.3.6 of NUREG-1757, Vol. 2, that the cost of disposing excavated soil as low-level radioactive waste is clearly greater than the benefit of removing and disposing of soil with residual radioactivity concentrations less than the dose criterion. Since the cost is greater than the benefit, it is not ALARA to excavate and dispose of soils with residual radioactivity concentrations below the DCGL.
Housekeeping and cleanup of survey units was completed prior to turnovers for FSS, and good housekeeping practices were employed during FSS. Good housekeeping practices and properly executed isolation and control in survey units mitigated any potential cross-contamination and ensured that the reported residual activity levels were accurate and final.

5.7     NRC/Independent Verification Team Findings Independent Verification surveys for the Phase 1 survey units were not performed.

6       Summary FSS is the process used to demonstrate that the FCS OLA soils comply with the radiological criteria for unrestricted use specified in 10 CFR 20.1402. The purpose of the FSS sample plan is to describe the methods to be used in planning, designing, conducting, and evaluating the FSS.

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The two radiological criteria for unrestricted use specified in 10 CFR 20.1402 are: 1) the residual radioactivity that is distinguishable from background radiation results in a TEDE to an AMCG that does not exceed 25 mrem/yr, including that from groundwater sources of drinking water, and
: 2) the residual radioactivity has been reduced to levels that are ALARA.
The survey units addressed in this FSSFR have met the DQOs of the FSS sample plans developed and implemented for each. In each survey unit, all identified ROC were used for statistical testing to determine the adequacy of the survey unit for FSS, the sample data passed the Sign Test, and a Retrospective Power Curve showed that adequate power was achieved. Each of the survey units were properly classified. In accordance with the LTP Section 5.10, all the Phase 1 survey units meet the release criteria.

7       References
: 1. Fort Calhoun Station Decommissioning Project License Termination Plan
: 2. NUREG-1575, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual
: 3. FCSD-RA-LT-100, Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station
: 4. FCSD-RA-LT-302, Final Status Survey Sample Plan Development
: 5. FCSD-RA-LT-303, Final Status Survey Isolation and Control Measures
: 6. FCSD-RA-LT-304, Final Status Survey Data Assessment
: 7. NUREG-1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance -
Characterization, Survey, and Determination of Radiological Criteria
: 8. FCSD-RA-LT-305, Final Status Survey Data Reporting
: 9. FCSD-RA-LT-200, Characterization Survey Plan
: 10. Historical Site Assessment for Fort Calhoun Station
: 11. TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan
: 12. FCSD-RA-LT-214, Calibration and Initial Set-Up of the Model 3001 and Associated Detectors
: 13. FCSD-RA-LT-203, Sample Media Collection for Site Characterization and Final Status Survey
: 14. FCSD-RA-LT-204, Sample Media Preparation for Site Characterization and Final Status Survey

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FINAL STATUS SURVEY FINAL REPORT - PHASE 1
: 15. FCSD-RA-LT-205, Chain-of-Custody Protocol for Site Characterization and Final Status Survey
: 16. FC-20-012, Fort Calhoun Station Decommissioning Project Radiological Characterization Report
: 17. FCSD-RA-LT-301, Survey Unit Classification
: 18. ISO 7503-1, Part 1, Evaluation of Surface Contamination, Beta-emitters (maximum beta energy greater than 0.15 MeV) and alpha-emitters
: 19. NUREG-1507, Minimum Detectable Concentrations with Typical Radiation Survey Instruments for Various Contaminants and Field Conditions
: 20. FC-19-006, Ludlum Model 44-10 Detector Sensitivity
: 21. NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual

8      Appendices A1     Survey Unit Release Record, Survey Unit 8101

A2     Survey Unit Release Record, Survey Unit 8102

A3     Survey Unit Release Record, Survey Unit 8103

A4     Survey Unit Release Record, Survey Unit 8104

A5     Survey Unit Release Record, Survey Unit 8105

A6     Survey Unit Release Record, Survey Unit 8106

A7     Survey Unit Release Record, Survey Unit 8109

A8     Survey Unit Release Record, Survey Unit 8110

A9     Survey Unit Release Record, Survey Unit 8202

A10    Survey Unit Release Record, Survey Unit 8203

A11    Survey Unit Release Record, Survey Unit 8305

A12    Survey Unit Release Record, Survey Unit 8307

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FORT CALHOUN STATION FINAL STATUS SURVEY RELEASE RECORD

SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

REVISION 0

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

PREPARED BY / DATE:
M. Uz, LT/FSS Specialist

REVIEWED      BY / DATE:
M. Bryant, LT/FSS Specialist

REVIEWED      BY / DATE:
A. Barker, Regulatory Assurance & Emergency Planning Manager

REVIEWED      BY / DATE:
D. Whisler, Manager Radiation Protection & Chemistry

APPROVED BY / DATE:
B. Bishop, LT/FSS Manager

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

TABLE OF CONTENTS
: 1. EXECUTIVE 

==SUMMARY==
................................................................................................................... 8
: 2. SURVEY UNIT DESCRIPTION ........................................................................................................ 8
: 3. CLASSIFICATION BASIS .................................................................................................................. 8
: 4. DATA QUALITY OBJECTIVES ..................................................................................................... 11
: 5. SURVEY DESIGN .............................................................................................................................. 14
: 6. SURVEY IMPLEMENTATION ....................................................................................................... 18
: 7. SURVEY RESULTS ........................................................................................................................... 20
: 8. QUALITY CONTROL ....................................................................................................................... 50
: 9. INVESTIGATIONS AND RESULTS ............................................................................................... 50
: 10. REMEDIATION AND RESULTS .................................................................................................... 51
: 11. CHANGES FROM THE FINAL STATUS SURVEY PLAN ......................................................... 51
: 12. DATA QUALITY ASSESSMENT .................................................................................................... 51
: 13. ANOMALIES ...................................................................................................................................... 52
: 14. CONCLUSION ................................................................................................................................... 52
: 15. REFERENCES .................................................................................................................................... 53
: 16. ATTACHMENTS ............................................................................................................................... 53

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LIST OF TABLES

Table 3 Statistical Quantities for Cs-137 and Co-60 from the Characterization Survey of 8100 .................... 9 Table 3 Off-Site Analysis for Characterization Samples in 8100 ....................................................................... 9 Table 4 Base Case DCGLs for Soil ..................................................................................................................... 13 Table 4 Operational DCGLs for Soil .................................................................................................................. 14 Table 5 Action Levels for Survey Unit 8101 ....................................................................................................... 15 Table 5 Random Sample Locations .................................................................................................................... 16 Table 5 Judgmental Sample Locations ............................................................................................................... 16 Table 5 Investigation Levels ................................................................................................................................ 18 Table 5 Synopsis of Survey Design ...................................................................................................................... 18 Table 7 Synopsis of Scan Results ........................................................................................................................ 20 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Samples Comprising the Statistical Sample Population ........................................................................................................................... 42 Table 7 Basic Statistical Properties of Random Sample Population and Survey Unit Dose .......................... 44 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples .... 45 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples .................. 49 Table 16 Survey Unit 8101 Complete Scan Data ............................................................................................... 58 Table 16 Survey Unit 8101 Sign Test .................................................................................................................. 61 Table 16 Survey Unit 8101 QC Assessment ....................................................................................................... 63

LIST OF FIGURES

Figure 7 Survey Unit 8101 GW            -1 GPS Scan Results ......................................................................................... 22 Figure 7 Survey Unit 8101 GW            -1 Z-Score ......................................................................................................... 23 Figure 7 Survey Unit 8101 GW            -1 Samples (Locations 15-23) .......................................................................... 24 Figure 7 Survey Unit 8101 GW            -2 GPS Scan Results ......................................................................................... 25 Figure 7 Survey Unit 8101 GW            -2 Z-Score ......................................................................................................... 26 Figure 7 Survey Unit 8101 GW            -2 Sample (Location 24) ................................................................................... 27 Figure 7 Survey Unit 8101 GW            -3 GPS Scan Results ......................................................................................... 28 Figure 7 Survey Unit 8101 GW            -3 Z-Score ......................................................................................................... 29 Figure 7 Survey Unit 8101 GW            -3 Samples (Locations 25-29) .......................................................................... 30 Figure 7 Survey Unit 8101 GW             -4 GPS Scan Results ....................................................................................... 31 Figure 7 Survey Unit 8101 GW             -4 Z-Score ....................................................................................................... 32 Figure 7 Survey Unit 8101 GW             -4 Z-Score (Locations 35-42) ......................................................................... 33 Figure 7 Survey Unit 8101 GW             -5 GPS Scan Results ....................................................................................... 34 Figure 7 Survey Unit 8101 GW             -5 Z-Score ....................................................................................................... 35 Figure 7 Survey Unit 8101 GW             -5 Samples (Locations 43-47) ........................................................................ 36 Figure 7 Survey Unit 8101 GW             -6 GPS Scan Results ....................................................................................... 37 Figure 7 Survey Unit 8101 GW             -6 Z-Score ....................................................................................................... 38 Figure 7 Survey Unit 8101 GW             -6 Samples (Locations 30-34) ........................................................................ 39 Figure 7 Survey Unit 8101 GW             -5 QC GPS Scan Results ................................................................................ 40 Figure 7 Survey Unit 8101 GW             -5 QC Z-Score ................................................................................................ 41 Figure 16 Survey Unit 8101 Scan Sample Locations Map                      ................................................................................ 56

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Figure 16 Quantile Plot for Cs-137 Concentration ............................................................................................ 67 Figure 16 Histogram for Cs-137 Concentration ................................................................................................ 68 Figure 16 Retrospective Power Curve for Survey Unit 8101             ............................................................................ 69

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LIST OF ABBREVIATIONS delta
/          relative shift sigma ALARA        as low as is reasonably achievable BcDCGL       base case derived concentration guideline level BcSOF        base case sum of fractions DQA          data quality assessment DQO          data quality objective DCGL         derived concentration guideline level DCGLW        derived concentration guideline level wide area FCS          Fort Calhoun Station FSS          final status survey GPS          Global Positioning System HTD          hard-to-detect IC           insignificant contributor LBGR         lower bound of the gray region LT/FSS       License Termination/Final Status Survey LTP          license termination plan m            meter MARSSIM      Multi-Agency Radiation Survey and Site Investigation Manual MDC          minimum detectable concentration mrem/yr      millirem per year NaI          sodium iodide NRC          Nuclear Regulatory Commission OpDCGL       operational derived concentration guideline level OpSOF        operational sum of fractions

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pCi/g        picocuries per gram QAPP         quality assurance project plan QC           quality control ROC          radionuclides of concern SOF          sum of fractions TEDE         total effective dose equivalent TSD          technical support document UBGR         upper bound of the gray region VSP          visual sample plan

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA
: 1. EXECUTIVE 

==SUMMARY==

This final status survey (FSS) release record for Survey Unit 8101, North Owner Controlled Area, has been generated in accordance with procedure FCSD-RA-LT-305, Final Status Survey Data Reporting (Reference 1) and satisfies the requirements of Section 5.7.1 of the Fort Calhoun Station Decommissioning Project License Termination Plan (FCS; LTP; Reference 2).
A FSS sample plan for this survey unit was developed in accordance with procedure FCSD-RA-LT-302, Final Status Survey Sample Plan Development (Reference 3), the FCS LTP, and with guidance from NUREG-1575, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM; Reference 4).
Survey Unit 8101, an open land survey unit, has a MARSSIM classification of 3. A survey plan was designed based upon use of the Sign Test as the nonparametric statistical test for compliance.
Both the Type I () and Type II () decision error rates were set at 0.05. As a random sample population, 14 soil samples were acquired from the survey unit. In addition, soil scanning was performed on 10% of the total surface area in the survey unit. The analytical results for all soil samples taken in Survey Unit 8101 indicate that the maximum sum of fractions (SOF),
considering the concentration of all applicable radionuclides of concern (ROCs) is equal to 0.3365 when applying the respective operational derived concentration guideline levels (OpDCGLs) for soil. Therefore, the null hypothesis is rejected, and Survey Unit 8101 is acceptable for unrestricted release. The mean SOF when applying the respective base case derived concentration guideline levels (BcDCGLs) for soil is 0.0374. This SOF equates to a dose for the survey unit of 0.9361 millirem per year (mrem/yr).
: 2. SURVEY UNIT DESCRIPTION Survey Unit 8101 is an impacted Class 3 open land survey unit. The surface area of the survey unit is 99,210 meters (m)2.

The boundary of the survey unit and the location of the soil samples were defined using a Global Positioning System (GPS). Refer to Attachment 1 of this report for a figure depicting Survey Unit 8101.
: 3. CLASSIFICATION BASIS Survey Unit 8101 was identified in the technical support document (TSD) 20-001, Historical Site Assessment for Fort Calhoun Station (Reference 5) as a Class 3 survey unit. The initial site characterization surveys were conducted between November 2019 and July 2020. The following summarizes the results of the characterization survey for Survey Unit 8101.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

During open land characterization, accessible land areas were sampled within Survey Area 8100.
Some survey units were not samples due to limited accessibility and the random survey design.
Samples were unable to be collected in Survey Unit 8101 due to flooding of the survey unit at the time of characterization. Therefore, the summation of characterization data from Survey Area 8100 is being applied to Survey Unit 8101.
In total, 82 surface soil samples were collected in Survey Area 8100. All samples were analyzed by the on-site gamma spectroscopy system. Cs-137 was detected at concentrations above minimum detectable concentration (MDC) in 35 of the samples, at a maximum concentration of 3.16E-01 picocuries/gram (pCi/g). Co-60 was not detected at concentrations above MDC in any of the surface soil samples. A summary of the analyses for surface soil samples taken during site characterization are presented in Table 3-1. Eight surface soil samples were sent to GEL Laboratories for off-site analysis of the initial suite of radionuclides. A summary of the off-site analyses of Survey Area 8100 is presented in Table 3-2.

Table 3 Statistical Quantities for Cs-137 and Co-60 from the Characterization Survey of 8100 Surface Soil        Co-60     Cs-137
                                # of Samples              82
                                  # >MDC              0         35 Mean (pCi/g)       2.59E-02  1.33E-01 Median (pCi/g)      2.10E-02  1.26E-01 Max (pCi/g)        1.15E-01  3.16E-01 Min (pCi/g)       0.00E+00   0.00E+00 Standard Deviation (pCi/g) 2.37E-02 7.21E-02

Table 3 Off-Site Analysis for Characterization Samples in 8100 Radionuclides       8100X-3-CJ-         8100X-3-CJ-        8100X-3-CJ-         8100X-3-CR-GSSX-044            GSSX-058            GSSX-064           GSSX-003 Am-241             7.07E-02            2.72E-02           4.72E-02            0.00E+00 Sb-125             4.66E-02            2.70E-02           6.77E-02            0.00E+00 C-14              0.00E+00            1.37E-01           1.07E-01            0.00E+00 Ce-144             1.02E-01           0.00E+00            0.00E+00            7.80E-02 Cs-134             8.37E-02            1.87E-02           5.11E-02            4.36E-02 Cs-137             1.72E-01            1.80E-01           1.24E-01            1.29E-01 Co-57             4.55E-03           0.00E+00            6.78E-03            0.00E+00 Co-58             0.00E+00            1.75E-02           0.00E+00            4.06E-02 Co-60             0.00E+00           0.00E+00            0.00E+00            5.21E-03 Cm-242             0.00E+00           0.00E+00            2.57E-02            0.00E+00

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

Radionuclides      8100X-3-CJ-        8100X-3-CJ-         8100X-3-CJ-       8100X-3-CR-GSSX-044            GSSX-058           GSSX-064           GSSX-003 Cm-243/244          0.00E+00           3.58E-02           9.67E-02            8.71E-03 Eu-152            6.02E-03           1.11E-03           8.78E-02           0.00E+00 Eu-154            0.00E+00           5.66E-03           1.29E-01           0.00E+00 Eu-155            7.90E-02           1.90E-02           1.79E-02            6.16E-02 Fe-55            2.18E+00           2.45E+00           4.43E+00           3.18E+00 Mn-54             7.75E-03           0.00E+00           1.94E-02            3.03E-02 Np-237            0.00E+00           0.00E+00           8.29E-04            1.12E-03 Ni-59            0.00E+00           0.00E+00           0.00E+00            1.39E-01 Ni-63            0.00E+00           0.00E+00           5.00E-01            4.13E-01 Nb-94             5.79E-02           3.37E-03           3.50E-02            8.78E-03 Pu-238            0.00E+00           2.85E-03           1.50E-02            4.90E-03 Pu-239/240          7.86E-03           1.35E-02           1.73E-02           0.00E+00 Pu-241            1.26E+00           1.36E+00           2.17E+00           0.00E+00 Ag-110m            2.08E-02           0.00E+00           7.33E-02           0.00E+00 Sr-90            1.33E-01           1.09E-01           1.33E-01            1.44E-01 Tc-99             0.00E+00           0.00E+00           0.00E+00           0.00E+00 H-3              0.00E+00           0.00E+00           0.00E+00           0.00E+00 Zn-65             7.12E-02           2.89E-03           8.45E-03            4.71E-03

Radionuclides      8100X-3-CR-        8100X-3-CR-        8100X-3-CR-        8100X-3-CR-GSSX-021            GSSX-027           GSSX-029           GSSX-038 Am-241             1.20E-02           1.26E-02           0.00E+00           0.00E+00 Sb-125            1.16E-01           2.24E-02           1.74E-03            1.22E-01 C-14             0.00E+00           4.79E-01           0.00E+00            2.73E-01 Ce-144            2.28E-01           7.07E-02           0.00E+00            2.41E-01 Cs-134            0.00E+00           4.96E-02           9.19E-02           0.00E+00 Cs-137            2.05E-01           3.08E-01           4.96E-01            1.41E-01 Co-57             2.37E-03           0.00E+00           5.95E-02            8.79E-03 Co-58             6.82E-02           0.00E+00           6.93E-02            4.28E-02 Co-60             2.29E-02           2.98E-02           0.00E+00           0.00E+00 Cm-242             0.00E+00           0.00E+00           0.00E+00           0.00E+00 Cm-243/244          2.23E-02           2.50E-02           1.20E-02            7.52E-03 Eu-152            0.00E+00           0.00E+00           2.82E-01            2.67E-02 Eu-154            3.91E-02           7.78E-02           7.35E-03           0.00E+00 Eu-155            4.19E-02           5.79E-02           6.79E-02           0.00E+00 Fe-55            1.88E+00           0.00E+00           2.30E+00           4.32E+00 Mn-54             3.95E-03           4.56E-02           0.00E+00            4.32E-03

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

Radionuclides       8100X-3-CR-         8100X-3-CR-        8100X-3-CR-         8100X-3-CR-GSSX-021            GSSX-027            GSSX-029            GSSX-038 Np-237             1.39E-03            1.89E-03           0.00E+00            0.00E+00 Ni-59             7.57E-01            7.73E-01           0.00E+00            1.17E+00 Ni-63             3.50E-01            0.00E+00            4.64E-01           4.66E-01 Nb-94             1.54E-02            0.00E+00            1.79E-01           0.00E+00 Pu-238             0.00E+00            5.67E-03            1.90E-02           4.82E-03 Pu-239/240           2.29E-02            1.16E-02            9.91E-03           1.06E-02 Pu-241             0.00E+00            8.17E-01           1.76E+00            1.70E+00 Ag-110m             0.00E+00            0.00E+00           0.00E+00            6.39E-02 Sr-90             5.79E-02            0.00E+00            3.00E-02           0.00E+00 Tc-99             0.00E+00            0.00E+00           0.00E+00            6.42E-03 H-3              0.00E+00            0.00E+00           0.00E+00            0.00E+00 Zn-65             0.00E+00            0.00E+00           0.00E+00            0.00E+00 Note: Bold values indicate concentration greater than MDC. Unbolded values indicate the value below MDC.
All values in pCi/g.

Based upon a review of the historical information and the completion of a Survey Unit Classification Worksheet, the correct final classification of Survey Unit 8101 was determined to be Class 3.
: 4. DATA QUALITY OBJECTIVES FSS planning and design relies on a properly executed data quality objective (DQO) process to ensure, through compliance with explicitly defined inputs and boundaries, that the primary objective of the survey is satisfied. The DQO process, utilized in accordance with MARSSIM, is described in the FCS LTP. The appropriate design for a given survey was developed using the DQO process as outlined in Appendix D of MARSSIM. A summary of the seven steps of the DQO process are outlined in the following paragraph.
The DQO process incorporates hypothesis testing and probabilistic sampling distributions to control decision errors during data analysis. Hypothesis testing is a process based on the scientific method that compares a baseline condition to an alternate condition. The baseline condition is technically known as the null hypothesis. Hypothesis testing rests on the premise that the null hypothesis is true, and sufficient evidence must be provided to reject it in favor of the alternative hypothesis. In designing the survey plan, the underlying assumption, or null hypothesis, was that residual activity in the survey unit exceeded the release criteria. Rejection of the null hypothesis would indicate that residual activity within the survey unit does not exceed the release criteria.
Therefore, the survey unit would satisfy the primary objective of the FSS sample plan.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

The primary objective of the FSS sample plan is to demonstrate that the level of residual radioactivity in Survey Unit 8101 did not exceed the release criteria specified in the LTP and that the potential dose from residual radioactivity is as low as is reasonably achievable (ALARA).
TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan (Reference 6) establishes the basis for an initial suite of potential ROC for decommissioning. LTP Chapter 2 provides detailed characterization data that describes the results of surveys completed of soil. Surface samples were taken in each impacted open land survey unit and analyzed for the presence of plant-derived radionuclides. The results of surface soil characterization in the impacted area surrounding FCS indicate that there is minimal residual radioactivity in soil.
Insignificant contributors (ICs) were determined consistent with the guidance contained in Section 3.3 of NUREG-1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance
- Characterization, Survey, and Determination of Radiological Criteria (Reference 7). For soil, the ROCs were found to be Cs-137, Co-60, Eu-152, and C-14. The remaining radionuclides were designated as IC and were eliminated from further detailed evaluation.
Section 5.2.6 of the LTP states that each radionuclide specific BcDCGL is equivalent to the level of residual radioactivity (above background levels) that could, when considered independently, result in a total effective dose equivalent (TEDE) of 25 mrem/yr to an Average Member of the Critical Group. To ensure that the summation of dose from each source term is 25 mrem/yr or less after all FSS is completed, the BcDCGLs are reduced based on an expected, or a priori, fraction of the 25 mrem/yr dose limit from each source term. The reduced DCGLs (i.e., OpDCGLs) can be related to the BcDCGLs as an expected fraction of dose based on an a priori assessment of what the expected dose should be based on the results of site characterization, process knowledge, and the extent of planned remediation. The OpDCGL is then used as the DCGL for the FSS design of the survey unit (e.g., calculation of surrogate DCGLs or, investigation levels). Details of the OpDCGLs derived for each dose component and the basis for the applied a priori dose fractions are provided in Section 5.2.6 of the LTP.
Multiple ROCs are known to be present at FCS. The dose contribution from each ROC is accounted for using the SOF to ensure that the total dose from all ROC does not exceed the dose criterion. A BcDCGL that is established for the average residual radioactivity in a survey unit is equivalent to a derived concentration guideline level wide area (DCGLW) as defined in MARSSIM.
At FCS, compliance is demonstrated through the summation of dose from seven distinct source terms (i.e., basements, soils, buried pipe, embedded pipe, above-ground structures, basement fill, and groundwater) for the end state. When applied to soil, the DCGLs are expressed in units of activity per unit of mass (pCi/g).

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

For FCS, soil is defined as a layer of soil beginning at the surface but extending to a depth of 1 m to allow for flexibility in compliance demonstration if contamination deeper than 0.15 m is encountered. Based on characterization data and historical information, there are no expectations of encountering a source term geometry that is comprised of a clean surface layer of soil over a contaminated subsurface soil layer. Section 6.9 of the LTP provides the exposure scenarios and modeling parameters that were used to calculate the site-specific soil DCGLs. The adjusted soil DCGLs for the unrestricted release of open land survey units as provided in the Section 6.16 of the LTP are presented in Table 4-1. The IC dose percentage of 5% was used to adjust the DCGLs in Table 4-1 to account for the dose from the eliminated IC radionuclides.

Table 4 Base Case DCGLs for Soil Surface Soil  Subsurface Radionuclide   BcDCGL      Soil BcDCGL (pCi/g)       (pCi/g)
C-14        5.70E+01      9.68E+00 Co-60       3.77E+00      2.93E+00 Cs-137      1.31E+01      7.27E+00 Eu-152       8.41E+00      7.36E+00

The reduced DCGLs, OpDCGLs, are calculated using Equation 5-1 from Chapter 5 of the LTP as shown below.

Equation 4 OpDCGL Calculation

The OpDCGLs for the unrestricted release of soil are provided in Table 4-2.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

Table 4 Operational DCGLs for Soil Surface Soil   Subsurface Radionuclide   OpDCGL       Soil OpDCGL (pCi/g)       (pCi/g)
C-14        1.59E+01      2.71E+00 Co-60       1.06E-00      8.21E-01 Cs-137       3.65E+00      2.04E-00 Eu-152       2.36E+00      2.06E-00

Instrument DQOs included a verification of the ability of the survey instrument to detect the radiations of interest relative to the OpDCGL. Survey instrument response checks were required prior to issuance and after the instrument had been used. Control and accountability of survey instruments was required to assure the quality and prevent the loss of data.
As part of the DQOs applied to laboratory processes, analysis results were reported as actual calculated results. The actual reported value was used as the recorded FSS result for measurement and sample values that are less than MDC. Negative values were recorded as zero. Results were not reported as less than MDC. Sample report summaries included unique sample identification, analytical method, radionuclide, result, uncertainty, laboratory data qualifiers, units, and the observed MDC.
In accordance with the LTP, for laboratory analysis, MDCs less than 10% of the OpDCGL were preferable while MDCs up to 50% of the OpDCGL were acceptable. The minimum acceptable MDC for measurements obtained using field instruments was 50% of the applicable OpDCGL.
: 5. SURVEY DESIGN The level of effort associated with planning a survey is based on the complexity of the survey and nature of the hazards. Guidance for preparing FSS plans is provided in procedure FCSD-RA-LT-302, Final Status Survey Sample Plan Development (Reference 3).
The DQO process validated that Co-60, Cs-137, Eu-152, and C-14 would be the ROCs in Survey Unit 8101 as presented in LTP Section 5.2.5. As discussed in LTP Section 5.2.6.2, instead of inferring the concentrations for the hard-to-detect (HTD) ROC C-14 using a surrogate approach, 100% of all samples collected in the survey unit were sent for off-site analysis for C-14. Table 5-1 presents the action levels for Survey Unit 8101 sample results and are based on 50% of the OpDCGLs.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

Table 5 Action Levels for Survey Unit 8101 ROC             Action Level (pCi/g)
Co-60             5.30E-01 Cs-137            1.83E+00 Eu-152            1.18E+00 C-14             7.95E+00

The Sign Test was selected as the nonparametric statistical test to demonstrate compliance with the release criteria. The use of the Sign Test did not require the selection or use of a background reference area, which simplified survey design and implementation. This approach was conservative since it included background Cs-137 as part of the sample set.
The number of soil samples for FSS was determined in accordance with procedure FCSD-RA-LT-302 (Reference 3). The relative shift (/) for the survey unit data set is defined as shift (),
which is the upper boundary of the gray region (UBGR), or the DCGL (SOF of 1), minus the lower bound of the gray region (LBGR), divided by sigma (), which is the standard deviation of the data set used for survey design. The optimal value for / should range between 1 and 3. The largest value the / can have is 3. If the calculated value of / exceeds 3, an adjusted value of 3 will be used for /. The / for Survey Unit 8101, based on the data for surface soil samples collected during the characterization of Survey Area 8100, was calculated as follows:

Equation 5 Relative Shift
                                    =   (1 0.0716)  =  25.8 0.036

As the calculated / was greater than 3, a value of 3 was used as the adjusted /. Both the Type I error (i.e.,  value) and the Type II error (i.e.,  value) were set at 0.05. The sample size from Table 5.5 of MARSSIM that equates to the Type I and Type II error of 0.05 for use with the Sign Test is an N value of 14.
A prospective power curve was generated using MARSSIM Power 2000, a software package developed under the sponsorship of the United States Nuclear Regulatory Commission (NRC) for implementation of the MARSSIM in support of the decommissioning license termination rule (10 CFR 20, Subpart E). The result of the MARSSIM Power 2000 computer run showed adequate power for the survey design.
Given that the survey unit is Class 3, sample locations were selected randomly. The random locations of the soil samples were selected using Visual Sample Plan (VSP), in accordance with

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

FCSD-RA-LT-302 (Reference 3). Input parameters included use of aerial photographs and the random sampling tool set with a predetermined number (14) of samples. The random coordinates generated with VSP were integrated with a GPS to identify sample locations in the field. Table 5-2 lists the random samples collected for FSS and the corresponding GPS coordinates, based on the Nebraska State Plane North American Datum 1983 coordinate system.

Table 5 Random Sample Locations Sample ID          Northing     Easting 8101X-3-FR-GSSX-001     195049.076   826841.596 8101X-3-FR-GSSX-002     195189.841   826694.178 8101X-3-FR-GSSX-003     194955.232   826989.013 8101X-3-FR-GSSX-004     195095.998   826620,470 8101X-3-FR-GSSX-005     195002.154   826767.887 8101X-3-FR-GSSX-006     195023.008   826731.033 8101X-3-FR-GSSX-007     195179.414   826611.256 8101X-3-FR-GSSX-008     194944.805   826906.091 8101X-3-FR-GSSX-009     195085.571   826758.674 8101X-3-FR-GSSX-010     194913.524   827016.654 8101X-3-FR-GSSA-011     195054.289   826648.110 8101X-3-FR-GSSX-012     194960.446   826795.528 8101X-3-FR-GSSX-013      195003.68   826648.110 8101X-3-FR-GSSX-014     195148.133   826703.392

In accordance with the sample plan, at least one judgmental sample is required from the survey unit. The number of judgmental samples obtained was 33, which brings the total number of samples collected for the FSS of Survey Unit 8101 to 47. Table 5-3 lists the judgmental samples collected for FSS and the corresponding GPS coordinates.

Table 5 Judgmental Sample Locations Sample ID         Northing     Easting 8101X-3-FJ-GSSX-015   194958.097   826798.248 8101X-3-FJ-GSSX-016   194965.278   826802.226 8101X-3-FJ-GSSX-017   194977.688   826791.959 8101X-3-FJ-GSSX-018   194977.477   826779.528 8101X-3-FJ-GSSX-019   194994.368   826781.855 8101X-3-FJ-GSSX-020   194988.865   826768.931 8101X-3-FJ-GSSX-021   195002.128   826762.486 8101X-3-FJ-GSSX-022   194995.289   826754.784 8101X-3-FJ-GSSX-023   194966.146   826822.017

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

Sample ID          Northing     Easting 8101X-3-FJ-GSSX-024    195086.54    826654.64 8101X-3-FJ-GSSX-025    195084.364  826680.597 8101X-3-FJ-GSSX-026    195062.066  826680.062 8101X-3-FJ-GSSA-027    195055.435  826688.788 8101X-3-FJ-GSSX-028    195062.137  826707.598 8101X-3-FJ-GSSX-029    195046.453   82667.034 8101X-3-FJ-GSSX-030    194996.382  826818.764 8101X-3-FJ-GSSX-031    195000.922  826828.567 8101X-3-FJ-GSSX-032    195005.928  826822.382 8101X-3-FJ-GSSA-033    195014.69    826797.53 8101X-3-FJ-GSSX-034    195026.135  826798.508 8101X-3-FJ-GSSX-035    195007.903  826751.024 8101X-3-FJ-GSSX-036    195002.622  826737.454 8101X-3-FJ-GSSX-037    195021.243   826747.25 8101X-3-FJ-GSSX-038    195028.228  826732.439 8101X-3-FJ-GSSX-039    195033.915  826756.792 8101X-3-FJ-GSSX-040    195035.01   826782.569 8101X-3-FJ-GSSX-041    195020.47   826773.203 8101X-3-FJ-GSSX-042    195028.921  826780.884 8101X-3-FJ-GSSX-043    195079.000   826710.25 8101X-3-FJ-GSSX-044    195074.509  826722.063 8101X-3-FJ-GSSX-045    195054.673  826731.175 8101X-3-FJ-GSSX-046    195038.311   826708.42 8101X-3-FJ-GSSX-047    195045.366  826723.655 The implementation of quality control (QC) measures as referenced by Section 5.6.3 of the LTP and FCSD-RA-LT-100, Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station (QAPP; Reference 8) includes the collection of a soil sample for split sample analysis on 5% of the soil samples taken in a survey unit with the locations selected at random. Six soil samples, 8101X-3-FQ-GSSX-008, 8101X-3-FR-GSSB-011, 8101X-3-FQ-GSSX-020, 8101X-3-FJ-GSSB-027, 8101X-3-FJ-GSSB-033, and 8101X-3-FQ-GSSX-043 were designated for split or duplicate sample QC analysis for the FSS of Survey Unit 8101.
Section 5.3.4 and Table 5-20 of the LTP specify that for Class 3 open land survey units surface scans will be performed on a judgmental percentage of the surface area in the survey unit. For Survey Unit 8101, 10% scan coverage was selected, which equals 9,921 m2.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

For this Class 3 open land survey unit, the Investigation Levels for area scanning and soil sample measurement results are those levels specified in Table 5-24 of the LTP and are reproduced below in Table 5-4.

Table 5 Investigation Levels Classification              Scan Investigation Levels            Direct Investigation Levels Class 3         >Operational DCGL or >MDCscan if MDCscan is     >0.5 Operational DCGL greater than Operational DCGL

Table 5-5 provides a synopsis of the survey design for Survey Unit 8101.

Table 5 Synopsis of Survey Design

Feature                    Design Criteria                    Basis Survey Unit Surface Area            99,210 m2                        GPS

Number of Random Samples                  14                  *  / = 3 (adjusted)
(N)
* MARSSIM Table 5.5
* Co-60:  1.06 pCi/g
* Cs-137: 3.65 pCi/g       Operational DCGLs for surface DCGLs
* Eu-152: 2.36 pCi/g                  soil, LTP, Table 5-8
* C-14: 15.9 pCi/g Scan and Direct Investigation          Table 5-4                  LTP, Table 5-24 Levels Scan Areal Coverage       9,921 m2, 10% areal coverage        LTP, Table 5-20

Judgmental Samples                    1                      Per Survey Design 33                  Actual Number Obtained HTD ROC Analysis                    100%                    LTP, Section 5.2.6.2 47                Number of Samples Analyzed 1 duplicate and 1 split sample     LTP, Section 5.6.3 QC                      selected at random         Actual Number Obtained 6
: 6. SURVEY IMPLEMENTATION For Survey Unit 8101, compliance with the unrestricted release criteria was demonstrated through a combination of soil scanning with a Ludlum Model 44-20 gamma detector and the sampling of soil for isotopic analysis.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

A License Termination/Final Status Survey (LT/FSS) Supervisor performed a visual inspection and walk-down of the survey unit on February 2, 2022, prior to performing FSS. The purpose of the walk-down was to assess the physical condition of the survey unit, evaluate access points and travel paths, and identify potentially hazardous conditions. At the time of survey, the soil in the survey unit was dry and free of any considerable constraint for the collection of samples and scan measurements.
FSS field activities were conducted under the FSS sample plan, which included DQOs, survey design, detailed FSS instructions, job safety analysis, and related procedures for reference. FSS field activities were projected to take 10 working days to complete. Daily briefings were conducted to discuss the expectations for job performance and to review the safety aspects of the job. A Field Log was used to document field activities and other information pertaining to the performance of the FSS. FSS field activities commenced on February 15, 2022, and concluded on February, 17, 2022.
A total of six different scan areas were scanned using a Ludlum Model 3001 paired with a Ludlum Model 44-20 (3 x 3) sodium iodide (NaI) detector and Trimble GPS unit. The background was established as the average of five one-minute static measurements, while maintaining the detector 6 from the soil. In Survey Unit 8101, background ranged from 23,740 counts per minute (cpm) up to 29,800 cpm.
All designated scan areas were scanned using the Model 44-20 detector operated in the rate-meter mode and using audio response. The probe was positioned no more than 2 from the ground and was moved at a scan speed of approximately 0.25 m per second. In accordance with FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors (Reference 9), scan MDC was sufficient to detect residual radioactivity at the action level. Complete scan results are provided in Attachment 2.
The 14 random sample locations were marked with flags based on GPS coordinates provided.
Each soil sample consisted of approximately 1 liter of soil. The soil sample media was sifted to remove stones and other media larger than 1 centimeter in diameter. All soil samples were collected, controlled, transported, stored, and transferred to the on-site laboratory using the chain-of-custody process from FCSD-RA-LT-205, Chain-of-Custody Protocol for Site Characterization and Final Status Survey (Reference 10), and in accordance with FCSD-RA-LT-203, Sample Media Collection for Site Characterization and Final Status Survey (Reference 11) and FCSD-RA-LT-204, Sample Media Preparation for Site Characterization and Final Status Survey (Reference 12).
The survey design specified that 100% of the samples were required for the HTD ROC analysis.
In total, 47 samples were selected for HTD radionuclide analysis.

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The implementation of survey specific QC measures included the collection of six samples (8101X-3-FQ-GSSX-008, 8101X-3-FR-GSSB-011, 8101X-3-FQ-GSSX-020, 8101X-3-FJ-GSSB-027, 8101X-3-FJ-GSSB-033, and 8101X-3-FQ-GSSX-043) for split or duplicate sample analysis.
: 7. SURVEY RESULTS All areas identified in the FSS sample plan were scanned for elevated activity levels. The 9,921 m2 scan requirement was achieved by scanning six areas, GW 1 through GW-6, within accessible land. Figure 16-1 in Attachment 1 presents the scan areas within the unit. Judgmental samples did not have an Action Level, as the readings were taken to verify the readings identified in the Z-Score analysis. Table 7-1 provides an overview of the scan results for all one 1 m2 scan areas around each random sample location and the gamma walkovers. Complete scan results are provided in Attachment 2, Table 16-1.

Table 7 Synopsis of Scan Results

Min Scan     Max Scan       Action Scan Area      Logged       Logged         Level        Scan       Investigation Reading       Reading       (cpm)        Alarms        Samples (cpm)         (cpm) 1         24600         26800        28537           N              0 2         23000         25500        28537           N              0 3         22000         25000        28537           N              0 4         37400         41300        28537           Y              0 5         26400         28300        28537           N              0 6         24900         27200        28537           N              0 7         24900         28100        28537           N              0 8         23900         25300        28537           N              0 9         32000         35600        28537           Y              0 10         22000         25600        28537           N              0 11         28000         36500        28537           Y              0 12         23900         27700        28537           N              0 13         23000         25900        28537           N              0 14         23000         25200        28537           N              0 8 QC        23900         25800        28537           N              0 GW-1        14512         30273        25249           Y              9 GW-2        13091         36520        31307           Y              1 GW-3        23237         29736        26914           Y              5

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Min Scan    Max Scan      Action Scan Area    Logged      Logged        Level       Scan      Investigation Reading     Reading       (cpm)      Alarms       Samples (cpm)       (cpm)
GW-4        21367       29261        26565         Y            8 GW-5        19964       30607        26092         Y            5 GW-6        13578       31176        27181         Y            5 GW-5 QC       20882       28422        25085         Y            0

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For Survey Unit 8101 GW-1, count rates ranged between 14,512 cpm and 30,273 cpm, with a mean count rate of 24,662 cpm and a standard deviation of 1,048 cpm. Figure 7-1 below presents a map of the gamma walkover for Survey Unit 8101 GW-1.

Figure 7 Survey Unit 8101 GW  -1 GPS Scan Results

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An evaluation of the Survey Unit 8101 GW-1 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement (i.e.,
+3 Z-Score). Nine locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-2 and Figure 7-3 below present maps of the +3 Z-Score measurements within Survey Unit 8101 GW-1 and the selected biased sampling locations.

Figure 7 Survey Unit 8101 GW   -1 Z-Score

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Figure 7 Survey Unit 8101 GW-1 Samples (Locations 15-23)

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For Survey Unit 8101 GW-2, count rates ranged between 13,091 cpm and 36,520 cpm, with a mean count rate of 28,816 cpm and a standard deviation of 2,056 cpm. Figure 7-4 below presents a map of the gamma walkover for Survey Unit 8101 GW-2.

Figure 7 Survey Unit 8101 GW  -2 GPS Scan Results

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An evaluation of the Survey Unit 8101 GW-2 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement. One location was selected for biased sample collection based on evaluation of the gamma walkover data. The biased location represented the maximum measurements encountered within the scan area. Figure 7-5 and Figure 7-6 below present maps of the +3 Z-Score measurements within Survey Unit 8101 GW-2 and the selected biased sampling locations.

Figure 7 Survey Unit 8101 GW   -2 Z-Score

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Figure 7 Survey Unit 8101 GW-2 Sample (Location 24)

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For Survey Unit 8101 GW-3, count rates ranged between 23,237 cpm and 29,736 cpm, with a mean count rate of 26,090 cpm and a standard deviation of 745 cpm. Figure 7-7 below presents a map of the gamma walkover for Survey Unit 8101 GW-3.

Figure 7 Survey Unit 8101 GW  -3 GPS Scan Results

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An evaluation of the Survey Unit 8101 GW-3 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement. Five locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-8 and Figure 7-9 below present maps of the +3 Z-Score measurements within Survey Unit 8101 GW-3 and the selected biased sampling locations.

Figure 7 Survey Unit 8101 GW   -3 Z-Score

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Figure 7 Survey Unit 8101 GW-3 Samples (Locations 25-29)

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For Survey Unit 8101 GW-4, count rates ranged between 21,367 cpm and 29,261 cpm, with a mean count rate of 25,033cpm and a standard deviation of 799cpm. Figure 7-10 below presents a map of the gamma walkover for Survey Unit 8101 GW-4.

Figure 7 Survey Unit 8101 GW -4 GPS Scan Results

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An evaluation of the Survey Unit 8101 GW-4 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement. Eight locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-11 and Figure 7-12 below present maps of the +3 Z-Score measurements within Survey Unit 8101 GW-4 and the selected biased sampling locations.

Figure 7 Survey Unit 8101 GW   -4 Z-Score

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Figure 7 Survey Unit 8101 GW-4 Z-Score (Locations 35-42)

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For Survey Unit 8101 GW-5, count rates ranged between 19,964 cpm and 30,607 cpm, with a mean count rate of 24,573 cpm and a standard deviation of 781 cpm. Figure 7-13 below presents a map of the gamma walkover for Survey Unit 8101 GW-5.

Figure 7 Survey Unit 8101 GW -5 GPS Scan Results

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An evaluation of the Survey Unit 8101 GW-5 data set was performed to assess  the small areas of elevated activity which exceeded three standard deviations above the mean measurement. Five locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-14 and Figure 7-15 below present maps of the +3 Z-Score measurements within Survey Unit 8101 GW-5 and the selected biased sampling locations.

Figure 7 Survey Unit 8101 GW   -5 Z-Score

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Figure 7 Survey Unit 8101 GW-5 Samples (Locations 43-47)

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For Survey Unit 8101 GW-6, count rates ranged between 13,578 cpm and 31,176 cpm, with a mean count rate of 25,370 cpm and a standard deviation of 1,231 cpm. Figure 7-16 below presents a map of the gamma walkover for Survey Unit 8101 GW-6.

Figure 7 Survey Unit 8101 GW -6 GPS Scan Results

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An evaluation of the Survey Unit 8101 GW-6 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement. Five locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-17 and Figure 7-18 below present maps of the +3 Z-Score measurements within Survey Unit 8101 GW-6 and the selected biased sampling locations.

Figure 7 Survey Unit 8101 GW   -6 Z-Score

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Figure 7 Survey Unit 8101 GW-6 Samples (Locations 30-34)

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For Survey Unit 8101 GW-5 QC, count rates ranged between 20,882 cpm and 28,422 cpm, with a mean count rate of 23,822 cpm and a standard deviation of 792 cpm. Figure 7-19 below presents a map of the gamma walkover for Survey Unit 8101 GW-5 QC.

Figure 7 Survey Unit 8101 GW -5 QC GPS Scan Results

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An evaluation of the Survey Unit 8101 GW-5 QC data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement. No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-20 below presents a map of the +3 Z-Score measurements within Survey Unit 8101 GW-5 QC.

Figure 7 Survey Unit 8101 GW   -5 QC Z-Score

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The on-site laboratory analyzed the 14 soil samples taken for nonparametric statistical testing using the on-site gamma spectroscopy system. A summary of the results for the 14 samples collected for nonparametric statistical testing is provided in Table 7-2. Gamma spectroscopy results revealed that Cs-137 was positively identified in five random samples. No other ROCs were positively identified. The off-site laboratory, GEL Laboratories, analyzed the 14 random samples for the HTD ROC C-14. C-14 was not detected in any of the 14 random samples. The maximum operational sum of fractions (OpSOF) for random samples is 0.3365.
The basic statistics for the random sample population, as compared to the BcDCGLs, and the survey unit dose are summarized in Table 7-3.
The SOF or unity rule is the mathematical test used to evaluate compliance with radiological criteria for license termination when more than one radionuclide has been determined to be potentially present. The equation for the unity rule is:

Equation 7 Unity Rule

Where:     Cn        =      concentration of radionuclide n DCGLn     =      DCGL of radionuclide n.

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Samples Comprising the Statistical Sample Population

Sample ID             ROC      Activity      OpDCGL        Fraction of   OpSOF (pCi/g)       (pCi/g)      OpDCGL

Co-60     1.32E-01      1.06E+00       1.25E-01 8101X-3-FR-GSSX-001        Cs-137    1.40E-01      3.65E+00       3.84E-02     0.26412 Eu-152    2.22E-01      2.36E+00       9.41E-02 C-14     1.14E-01      1.59E+01       7.17E-03 Co-60     8.57E-02      1.06E+00       8.08E-02 Cs-137    2.44E-01      3.65E+00       6.68E-02 8101X-3-FR-GSSX-002        Eu-152    0.00E+00      2.36E+00       0.00E+00     0.14770

C-14     0.00E+00      1.59E+01       0.00E+00 8101X-3-FR-GSSX-003        Co-60     2.93E-02      1.06E+00       2.76E-02     0.02764 Cs-137    0.00E+00      3.65E+00       0.00E+00

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Sample ID           ROC      Activity    OpDCGL       Fraction of   OpSOF (pCi/g)      (pCi/g)      OpDCGL

Eu-152   0.00E+00     2.36E+00      0.00E+00 C-14    0.00E+00     1.59E+01      0.00E+00 Co-60    1.76E-02     1.06E+00      1.66E-02 8101X-3-FR-GSSX-004      Cs-137   1.67E-01     3.65E+00      4.58E-02     0.17210 Eu-152   2.59E-01     2.36E+00      1.10E-01 C-14    0.00E+00     1.59E+01      0.00E+00 Co-60    7.78E-03     1.06E+00      7.34E-03 8101X-3-FR-GSSX-005      Cs-137   1.96E-01     3.65E+00      5.37E-02     0.06132 Eu-152   0.00E+00     2.36E+00      0.00E+00 C-14    4.52E-03     1.59E+01      2.84E-04 Co-60    3.96E-02     1.06E+00      3.74E-02 8101X-3-FR-GSSX-006      Cs-137   2.20E-01     3.65E+00      6.03E-02     0.18657 Eu-152   1.71E-01     2.36E+00      7.25E-02 C-14    2.62E-01     1.59E+01      1.65E-02 Co-60    1.43E-02     1.06E+00      1.35E-02 8101X-3-FR-GSSX-007      Cs-137   1.06E-01     3.65E+00      2.90E-02     0.04349 Eu-152   0.00E+00     2.36E+00      0.00E+00 C-14    1.53E-02     1.59E+01      9.62E-04 Co-60    0.00E+00     1.06E+00      0.00E+00 8101X-3-FR-GSSX-008      Cs-137   6.42E-02     3.65E+00      1.76E-02     0.04721 Eu-152   0.00E+00     2.36E+00      0.00E+00 C-14    4.71E-01     1.59E+01      2.96E-02 Co-60    3.29E-02     1.06E+00      3.10E-02 8101X-3-FR-GSSX-009      Cs-137   2.32E-02     3.65E+00      6.36E-03     0.03739 Eu-152   0.00E+00     2.36E+00      0.00E+00 C-14    0.00E+00     1.59E+01      0.00E+00 Co-60    4.43E-02     1.06E+00      4.18E-02 Cs-137   9.05E-02     3.65E+00      2.48E-02 8101X-3-FR-GSSX-010      Eu-152   2.29E-01     2.36E+00      9.70E-02     0.16696

C-14    5.31E-02     1.59E+01      3.34E-03

8101X-3-FR-GSSA-011      Co-60    2.84E-01     1.06E+00      2.68E-01     0.33651 Cs-137   2.34E-01     3.65E+00      6.41E-02

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Sample ID            ROC       Activity      OpDCGL        Fraction of   OpSOF (pCi/g)       (pCi/g)      OpDCGL

Eu-152    0.00E+00      2.36E+00       0.00E+00 C-14     7.12E-02      1.59E+01       4.48E-03 Co-60     1.32E-01      1.06E+00       1.25E-01 8101X-3-FR-GSSX-012        Cs-137    1.22E-01      3.65E+00       3.34E-02     0.16745 Eu-152    0.00E+00      2.36E+00       0.00E+00 C-14     1.51E-01      1.59E+01       9.50E-03 Co-60     4.03E-02      1.06E+00       3.80E-02 8101X-3-FR-GSSX-013        Cs-137    9.13E-02      3.65E+00       2.50E-02     0.14354 Eu-152    1.90E-01      2.36E+00       8.05E-02 C-14     0.00E+00      1.59E+01       0.00E+00 Co-60     2.87E-02      1.06E+00       2.71E-02 8101X-3-FR-GSSX-014        Cs-137    1.22E-01      3.65E+00       3.34E-02     0.06834 Eu-152    1.85E-02      2.36E+00       7.84E-03 C-14     0.00E+00      1.59E+01       0.00E+00 Note: Bold values indicate concentrations greater than MDC.

Table 7 Basic Statistical Properties of Random Sample Population and Survey Unit Dose Avg      Avg ROC       Mean        Median       Max        Min      Std. Dev. BcDCGL     BcSOF    Dose per (pCi/g)     (pCi/g)     (pCi/g)    (pCi/g)    (pCi/g)    (pCi/g)      per      ROC ROC Co-60    6.35E-02    3.63E-02    2.84E-01   0.00E+00   7.59E-02    3.77E+00   1.68E-02 4.21E-01 Cs-137   1.30E-01    1.22E-01    2.44E-01   0.00E+00   7.55E-02    1.31E+01   9.92E-03 2.48E-01 Eu-152   7.78E-02    0.00E+00    2.59E-01   0.00E+00   1.07E-01    8.41E+00   9.25E-03 2.31E-01 C-14     8.16E-02    9.91E-03    4.71E-01   0.00E+00   1.36E-01    5.70E+01   1.43E-03 3.58E-02

Mean base case sum of fractions (BcSOF) =
0.0374 Dose assigned to the survey unit =
0.9361 mrem/yr

The on-site laboratory analyzed the 33 judgmental soil samples using the on-site gamma spectroscopy system. A summary of the analytical results for the judgmental soil samples is provided in Table 7-4. Gamma spectroscopy results revealed that Cs-137 was positively identified

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in one judgmental sample. No other ROCs were positively identified. GEL Laboratories analyzed the 33 judgmental samples for the HTD ROC C-14. C-14 was not detected in any of the 33 judgmental samples. The maximum OpSOF for judgmental samples is 0.2095.

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples Measured     OpDCGL        Fraction Sample ID         ROC     Activity                     of      OpSOF (pCi/g)      (pCi/g)    OpDCGL Co-60   7.25E-02     1.06E+00     6.84E-02 8101X-3-FJ-GSSX-015    Cs-137   2.05E-02     3.65E+00     5.62E-03   0.14746 Eu-152   1.53E-01     2.36E+00     6.48E-02 C-14    1.37E-01     1.59E+01     8.62E-03 Co-60   1.78E-01     1.06E+00     1.68E-01 8101X-3-FJ-GSSX-016    Cs-137   1.09E-01     3.65E+00     2.99E-02   0.19779 Eu-152   0.00E+00     2.36E+00     0.00E+00 C-14    0.00E+00     1.59E+01     0.00E+00 Co-60   5.07E-02     1.06E+00     4.78E-02 8101X-3-FJ-GSSX-017    Cs-137   0.00E+00     3.65E+00     0.00E+00   0.18258 Eu-152   3.18E-01     2.36E+00     1.35E-01 C-14    0.00E+00     1.59E+01     0.00E+00 Co-60   4.09E-02     1.06E+00     3.86E-02 8101X-3-FJ-GSSX-018    Cs-137   1.90E-01     3.65E+00     5.21E-02   0.11083 Eu-152   0.00E+00     2.36E+00     0.00E+00 C-14    3.21E-01     1.59E+01     2.02E-02 Co-60   7.61E-02     1.06E+00     7.18E-02 Cs-137   8.50E-02     3.65E+00     2.33E-02 Eu-152   0.00E+00     2.36E+00     0.00E+00 8101X-3-FJ-GSSX-019                                                  0.10980

C-14    2.34E-01     1.59E+01     1.47E-02

Co-60   1.30E-01     1.06E+00     1.23E-01 8101X-3-FJ-GSSX-020    Cs-137   5.10E-02     3.65E+00     1.40E-02   0.13766 Eu-152   0.00E+00     2.36E+00     0.00E+00 C-14    1.66E-02     1.59E+01     1.04E-03 8101X-3-FJ-GSSX-021     Co-60   2.35E-03     1.06E+00     2.22E-03   0.00611

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Measured     OpDCGL       Fraction Sample ID        ROC      Activity                    of      OpSOF (pCi/g)      (pCi/g)     OpDCGL Cs-137  0.00E+00     3.65E+00     0.00E+00 Eu-152  9.19E-03     2.36E+00     3.89E-03 C-14   0.00E+00     1.59E+01     0.00E+00 Co-60   0.00E+00     1.06E+00     0.00E+00 8101X-3-FJ-GSSX-022    Cs-137  2.65E-02     3.65E+00     7.26E-03   0.00726 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14   0.00E+00     1.59E+01     0.00E+00 Co-60   1.14E-01     1.06E+00     1.08E-01 8101X-3-FJ-GSSX-023    Cs-137  0.00E+00     3.65E+00     0.00E+00   0.14085 Eu-152  7.86E-02     2.36E+00     3.33E-02 C-14   0.00E+00     1.59E+01     0.00E+00 Co-60   7.78E-02     1.06E+00     7.34E-02 8101X-3-FJ-GSSX-024    Cs-137  0.00E+00     3.65E+00     0.00E+00   0.07340 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14   0.00E+00     1.59E+01     0.00E+00 Co-60   1.38E-02     1.06E+00     1.30E-02 8101X-3-FJ-GSSX-025    Cs-137  0.00E+00     3.65E+00     0.00E+00   0.02569 Eu-152  2.99E-02     2.36E+00     1.27E-02 C-14   0.00E+00     1.59E+01     0.00E+00 Co-60   5.36E-02     1.06E+00     5.06E-02 8101X-3-FJ-GSSX-026    Cs-137  5.81E-02     3.65E+00     1.59E-02   0.06648 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14   0.00E+00     1.59E+01     0.00E+00 Co-60   1.35E-01     1.06E+00     1.27E-01 Cs-137  0.00E+00     3.65E+00     0.00E+00 8101X-3-FJ-GSSA-027    Eu-152  0.00E+00     2.36E+00     0.00E+00   0.12960

C-14   3.56E-02     1.59E+01     2.24E-03

Co-60   1.17E-01     1.06E+00     1.10E-01 8101X-3-FJ-GSSX-028    Cs-137  1.72E-01     3.65E+00     4.71E-02   0.15750 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14   0.00E+00     1.59E+01     0.00E+00 8101X-3-FJ-GSSX-029    Co-60   3.48E-02     1.06E+00     3.28E-02   0.05877

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Measured     OpDCGL       Fraction Sample ID         ROC     Activity                     of     OpSOF (pCi/g)      (pCi/g)     OpDCGL Cs-137  7.53E-02     3.65E+00     2.06E-02 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14    8.45E-02    1.59E+01     5.31E-03 Co-60    7.05E-02    1.06E+00     6.65E-02 8101X-3-FJ-GSSX-030    Cs-137  0.00E+00     3.65E+00     0.00E+00   0.07905 Eu-152   2.96E-02    2.36E+00     1.25E-02 C-14   0.00E+00     1.59E+01     0.00E+00 Co-60    1.34E-01    1.06E+00     1.26E-01 8101X-3-FJ-GSSX-031    Cs-137  0.00E+00     3.65E+00     0.00E+00   0.19736 Eu-152   1.60E-01    2.36E+00     6.78E-02 C-14    5.00E-02    1.59E+01     3.14E-03 Co-60    1.63E-01    1.06E+00     1.54E-01 8101X-3-FJ-GSSX-032    Cs-137   1.15E-02    3.65E+00     3.15E-03   0.15692 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14   0.00E+00     1.59E+01     0.00E+00 Co-60    7.83E-02    1.06E+00     7.39E-02 8101X-3-FJ-GSSA-033    Cs-137   9.02E-02    3.65E+00     2.47E-02   0.09858 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14   0.00E+00     1.59E+01     0.00E+00 Co-60   0.00E+00     1.06E+00     0.00E+00 8101X-3-FJ-GSSX-034    Cs-137   2.81E-02    3.65E+00     7.70E-03   0.00770 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14   0.00E+00     1.59E+01     0.00E+00 Co-60   0.00E+00     1.06E+00     0.00E+00 Cs-137   2.26E-01    3.65E+00     6.19E-02 8101X-3-FJ-GSSX-035    Eu-152   3.08E-01    2.36E+00     1.31E-01   0.20953

C-14    2.72E-01    1.59E+01     1.71E-02

Co-60    6.71E-02    1.06E+00     6.33E-02 8101X-3-FJ-GSSX-036    Cs-137   5.59E-02    3.65E+00     1.53E-02   0.08020 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14    2.51E-02    1.59E+01     1.58E-03 8101X-3-FJ-GSSX-037    Co-60    1.61E-01    1.06E+00     1.52E-01   0.19696

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

Measured     OpDCGL        Fraction Sample ID         ROC     Activity                     of     OpSOF (pCi/g)      (pCi/g)     OpDCGL Cs-137   7.11E-02    3.65E+00      1.95E-02 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14    4.07E-01    1.59E+01      2.56E-02 Co-60   4.09E-02    1.06E+00      3.86E-02 8101X-3-FJ-GSSX-038    Cs-137  0.00E+00     3.65E+00     0.00E+00   0.07585 Eu-152   2.99E-02    2.36E+00      1.27E-02 C-14    3.91E-01    1.59E+01      2.46E-02 Co-60   8.80E-02    1.06E+00      8.30E-02 8101X-3-FJ-GSSX-039    Cs-137   3.83E-02    3.65E+00      1.05E-02  0.10773 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14    2.26E-01    1.59E+01      1.42E-02 Co-60   3.86E-02    1.06E+00      3.64E-02 8101X-3-FJ-GSSX-040    Cs-137   6.79E-02    3.65E+00      1.86E-02  0.07596 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14    3.33E-01    1.59E+01      2.09E-02 Co-60   1.36E-01    1.06E+00      1.28E-01 8101X-3-FJ-GSSX-041    Cs-137   1.33E-01    3.65E+00      3.64E-02  0.17996 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14    2.42E-01    1.59E+01      1.52E-02 Co-60   2.56E-02    1.06E+00      2.42E-02 8101X-3-FJ-GSSX-042    Cs-137   1.15E-02    3.65E+00      3.15E-03  0.04196 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14    2.33E-01    1.59E+01      1.47E-02 Co-60   1.28E-01    1.06E+00      1.21E-01 Cs-137   9.57E-02    3.65E+00      2.62E-02 8101X-3-FJ-GSSX-043    Eu-152  0.00E+00     2.36E+00     0.00E+00   0.17163

C-14    3.92E-01    1.59E+01      2.47E-02

Co-60   3.29E-02    1.06E+00      3.10E-02 8101X-3-FJ-GSSX-044    Cs-137   1.34E-02    3.65E+00      3.67E-03  0.03471 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14   0.00E+00     1.59E+01     0.00E+00 8101X-3-FJ-GSSX-045     Co-60  0.00E+00     1.06E+00     0.00E+00   0.07176

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

Measured     OpDCGL        Fraction Sample ID         ROC      Activity                     of      OpSOF (pCi/g)      (pCi/g)     OpDCGL Cs-137  2.18E-02     3.65E+00      5.97E-03 Eu-152  7.69E-02     2.36E+00      3.26E-02 C-14   5.28E-01     1.59E+01      3.32E-02 Co-60   5.78E-02     1.06E+00      5.45E-02 8101X-3-FJ-GSSX-046     Cs-137  5.56E-03     3.65E+00      1.52E-03   0.06328 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14   1.15E-01     1.59E+01      7.23E-03 Co-60   3.60E-02     1.06E+00      3.40E-02 8101X-3-FJ-GSSX-047     Cs-137  1.24E-01     3.65E+00      3.40E-02   0.06793 Eu-152  0.00E+00     2.36E+00     0.00E+00 C-14   0.00E+00     1.59E+01     0.00E+00 Note: Bold values indicate concentrations greater than MDC.

The implementation of survey specific QC measures included the collection of six samples (8101X-3-FQ-GSSX-008, 8101X-3-FR-GSSB-011, 8101X-3-FQ-GSSX-020, 8101X-3-FJ-GSSB-027, 8101X-3-FJ-GSSB-033, and 8101X-3-FQ-GSSX-043) for split or duplicate sample analysis. The on-site laboratory analyzed the QC samples using the on-site gamma spectroscopy system. A summary of the analytical results for the QC samples is provided in Table 7-5. No ROCs were positively identified in any QC sample. The maximum OpSOF for QC samples is 0.1204.

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples

Activity   OpDCGL      Fraction Sample ID          ROC      (pCi/g)    (pCi/g)       of      OpSOF OpDCGL Co-60   8.87E-02   1.06E+00    0.08368 Cs-137   1.34E-01   3.65E+00    0.03671 8101X-3-FQ-GSSX-008     Eu-152   0.00E+00   2.36E+00    0.00000    0.12039 C-14    0.00E+00   1.59E+01    0.00000 Co-60   0.00E+00   1.06E+00    0.00000 Cs-137   8.17E-02   3.65E+00    0.02238 8101X-3-FR-GSSB-011     Eu-152   0.00E+00   2.36E+00    0.00000    0.02238 C-14    0.00E+00   1.59E+01    0.00000

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

Activity  OpDCGL       Fraction Sample ID          ROC      (pCi/g)    (pCi/g)        of      OpSOF OpDCGL Co-60   0.00E+00   1.06E+00     0.00000 Cs-137  3.84E-02   3.65E+00     0.01052 8101X-3-FQ-GSSX-020      Eu-152  0.00E+00   2.36E+00     0.00000    0.01052 C-14   0.00E+00   1.59E+01     0.00000 Co-60   8.86E-02   1.06E+00     0.08358 Cs-137  2.37E-02   3.65E+00     0.00649 8101X-3-FJ-GSSB-027      Eu-152  6.62E-02   2.36E+00     0.02805    0.11813 C-14   0.00E+00   1.59E+01     0.00000 Co-60   6.55E-03   1.06E+00     0.00618 Cs-137  9.75E-02   3.65E+00     0.02671 8101X-3-FJ-GSSB-033      Eu-152  0.00E+00   2.36E+00     0.00000    0.03289 C-14   0.00E+00   1.59E+01     0.00000 Co-60   9.67E-05   1.06E+00     0.00009 Cs-137  1.48E-01   3.65E+00     0.04055 8101X-3-FQ-GSSX-043      Eu-152  0.00E+00   2.36E+00     0.00000    0.04064 C-14   0.00E+00   1.59E+01     0.00000 Note: Bold values indicate concentrations greater than MDC.
: 8. QUALITY CONTROL The on-site laboratory processed six split and duplicate samples (8101X-3-FQ-GSSX-008, 8101X-3-FR-GSSB-011, 8101X-3-FQ-GSSX-020, 8101X-3-FJ-GSSB-027, 8101X-3-FJ-GSSB-033, and 8101X-3-FQ-GSSX-043) using gamma spectroscopy analysis. The data was evaluated using acceptance criteria specified in NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual (Reference 13) as detailed in Section 5.6.3.2 of the LTP. There was acceptable agreement between standard and comparison sample results in all cases. Refer to  for data and QC analysis results.
: 9. INVESTIGATIONS AND RESULTS During the FSS of Survey Unit 8101, areas with +3 sigma/alarms were investigated. Thirty-three judgmental samples were collected for investigation, all with radiological concentrations below the OpDCGL.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA
: 10. REMEDIATION AND RESULTS No radiological remedial action as described by MARSSIM Section 5.4 was performed in this Survey Unit 8101 prior to or as a result of the FSS. Chapter 4 of the LTP determined that remediation beyond that required to meet the release criteria is unnecessary and the remaining residual radioactivity in soil was ALARA.
: 11. CHANGES FROM THE FINAL STATUS SURVEY PLAN There were no addendums to the FSS plan.
: 12. DATA QUALITY ASSESSMENT The DQO sample design and data were reviewed in accordance with FCSD-RA-LT-304, Final Status Survey Data Assessment (Reference 14) for completeness and consistency.
Documentation was complete and legible. Surveys and the collection of samples were consistent with the DQOs and were sufficient to ensure that the survey unit was properly designated as Class
: 3. The survey design had adequate power as indicated by the retrospective power curve (see , Figure 16-4).
The measurement results indicated that all samples were less than a SOF of 1 when compared to the OpDCGLs.
Although MARSSIM states that the Sign Test need not be performed in the instance that no measurements surpass the OpDCGL, the test was conducted to demonstrate adherence to the statistical principles of the DQO process. The Sign Test was performed on the data and compared to the original assumptions of the DQOs. The evaluation of the Sign Test results clearly demonstrates that Survey Unit 8101 passes the unrestricted release criteria, thus, the null hypothesis is rejected. The results of the Sign Test are presented in Attachment 3.
The preliminary data review consisted of calculating basic statistical quantities (e.g., mean, median, standard deviation). All data was considered valid including negative values, zeros, and values reported below the MDC. The mean and median values for each ROC were well below the respective OpDCGLs. Also, the retrospective power curve shows that a sufficient number of samples were collected to achieve the desired power; therefore, the Survey Unit 8101 meets the unrestricted release criteria with adequate power as required by the DQOs.
The means of all identified isotopes are less than the Consultation Triggers for Residential Soil Concentration depicted in Table H.1 of NUREG 1757, Vol.1, Rev. 2 (Memorandum of Understanding Table 1). The full table is included in Attachment 5 of this release record.
The data for Cs-137 is presented graphically through a frequency plot and quantile plot. All graphical presentations are provided in Attachment 6.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA
: 13. ANOMALIES No anomalies were observed during the performance or analyses of the survey.
: 14. CONCLUSION Survey Unit 8101 has met the DQOs of the FSS plan. The ALARA criteria as specified in Chapter 4 of the LTP were achieved. The elevated measurement comparison for soils was not applicable and remediation was not required.
All identified ROCs were used for statistical testing to determine the adequacy of Survey Unit 8101 for FSS. Evaluation of the data shows that none of the random ROC concentration values exceeds the OpDCGLs; therefore, in accordance with LTP Section 5.2.6, Survey Unit 8101 meets the release criteria.
The sample data passed the Sign Test. The null hypothesis was rejected. The retrospective power curve showed that adequate power was achieved. The survey unit is properly classified as Class 3.
The dose contribution from soil in Survey Unit 8101 is 0.9361 mrem/yr TEDE, based on the average concentration of the ROCs in samples used for nonparametric statistical testing.
Survey Unit 8101 is acceptable for unrestricted release.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA
: 15. REFERENCES
: 1. FCSD-RA-LT-305, Final Status Survey Data Reporting
: 2. Fort Calhoun Station Decommissioning Project License Termination Plan
: 3. FCSD-RA-LT-302, Final Status Survey Sample Plan Development
: 4. NUREG-1575, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual
: 5. TSD 20-001, Historical Site Assessment for Fort Calhoun Station
: 6. TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan
: 7. NUREG-1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance -
Characterization, Survey, and Determination of Radiological Criteria - Draft Report for Comment
: 8. FCSD-RA-LT-100, Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station
: 9. FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors
: 10. FCSD-RA-LT-205, Chain-of-Custody Protocol for Site Characterization and Final Status Survey
: 11. FCSD-RA-LT-203, Sample Media Collection for Site Characterization and Final Status Survey
: 12. FCSD-RA-LT-204, Sample Media Preparation for Site Characterization and Final Status Survey
: 13. NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual
: 14. FCSD-RA-LT-304, Final Status Survey Data Assessment
: 16. ATTACHMENTS Attachment 1 - Figure Attachment 2 - Scan Data Attachment 3 - Sign Test

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

Attachment 4 - Quality Control Assessment Attachment 5 - Consultation Triggers for Residential Soil Concentrations Attachment 6 - Graphical Presentations

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

ATTACHMENT 1 FIGURE

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Figure 16 Survey Unit 8101 Scan Sample Locations Map

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ATTACHMENT 2 SCAN DATA

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Table 16 Survey Unit 8101 Complete Scan Data Min      Max Detector  Detector    M3001     Survey               Scan      Scan         Avg       Action   Scan Type        ID         ID       Unit    Location   Logged    Logged    Background    Level   Alarms Result    Result      (cpm)      (cpm)
(cpm)     (cpm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

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

Min       Max Detector   Detector    M3001     Survey               Scan      Scan         Avg       Action    Scan Type        ID          ID       Unit    Location   Logged    Logged    Background    Level    Alarms Result    Result       (cpm)      (cpm)
(cpm)     (cpm) 44-20    PR397204    25021208    8101       33                 25300 44-20    PR397204    25021208    8101       34                 25100 44-20    PR397204    25021208    8101       35                 25900 44-20    PR397204    25021208    8101       36                 26100 44-20    PR397204    25021208    8101       37                 25500 44-20    PR397204    25021208    8101       38                 26000 44-20    PR397204    25021208    8101       39                 26200 44-20    PR397204    25021208    8101       40                 24300 44-20    PR397204    25021208    8101       41                 26700 44-20    PR397204    25021208    8101       42                 25700 44-20    PR397204    25021208    8101       43                 25000 44-20    PR397204    25021208    8101       44                 24800 44-20    PR397204    25021208    8101       45                 24800 44-20    PR397204    25021208    8101       46                 24700 44-20    PR397204    25021208    8101       47                 24900 44-20    PR397732    25021209    8101     20 QC                25300 44-20    PR403795    25021219    8101     8 QC       23900     25800       27100      28537       N 44-20    PR397204    25021208    8101     GW 1       14512     30273       23900      25249      Y 44-20    PR397732    25021209    8101     GW 2       13091     36520       29800      31307      Y 44-20    PR404738    25021210    8101     GW 3       23237     29736       25520      26914      Y 44-20    PR404738    25021210    8101     GW 4       21367     29261       25180      26565      Y 44-20    PR397204    25021208    8101     GW 5       19964     30607       24720      26092      Y 44-20    PR397732    25021209    8101     GW 6       13578     31176       25780      27181      Y 44-20    PR404738    25021210    8101     GW 5       20882     28422       23740      25085      Y QC Areas above three standard deviations were scanned for verification of original scans prior to judgmental sample collection.

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8101 NORTH OWNER CONTROLLED AREA

ATTACHMENT 3 SIGN TEST

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Table 16 Survey Unit 8101 Sign Test
                            #         SOF        1-Ws        Sign (Ws) 1       0.26412       0.74        +1 2       0.14770       0.85        +1 3       0.02764       0.97        +1 4       0.17210       0.83        +1 5       0.06132       0.94        +1 6       0.18657       0.81        +1 7       0.04349       0.96        +1 8       0.04721       0.95        +1 9       0.03739       0.96        +1 10       0.16696       0.83        +1 11       0.33651       0.66        +1 12       0.16745       0.83        +1 13       0.14354       0.86        +1 14       0.06834       0.93        +1 Number of positive   differences (S+)                    14

Critical Value     10

Survey Unit           Meets the Acceptance Criteria

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ATTACHMENT 4 QUALITY CONTROL ASSESSMENT

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Table 16 Survey Unit 8101 QC Assessment

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ATTACHMENT 5 CONSULTATION TRIGGERS FOR RESIDENTIAL SOIL CONCENTRATION

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ATTACHMENT 6 GRAPHICAL PRESENTATIONS

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Figure 16 Quantile Plot for Cs-137 Concentration Quantile Plot For Cs        -137

3.00E-01

2.50E-01

2.00E-01

1.50E-01

1.00E-01

5.00E-02

0.00E+00 0%    10%   20%    30%   40%   50%    60%   70%    80%   90%   100%

PERCENTAGE

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Figure 16 Histogram for Cs-137 Concentration Frequency Plot For Cs         -137

10 9
8 7
6 5
4 3
2 1
0 4.07E-02   8.13E-02    1.22E-01    1.63E-01    2.03E-01    2.44E-01

UPPER END VALUE (PCI/G)

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Figure 16 Retrospective Power Curve for Survey Unit 8101

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FORT CALHOUN STATION FINAL STATUS SURVEY RELEASE RECORD

SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

REVISION 0

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

PREPARED BY / DATE:
L. Coffey, LT/FSS Specialist

REVIEWED      BY / DATE:
M. Uz, LT/FSS  Specialist

REVIEWED      BY / DATE:
A. Barker Regulatory Assurance & Emergency Planning Manager

REVIEWED      BY / DATE:
D. Whisler Manager Radiation Protection & Chemistry

APPROVED BY / DATE:
B. Bishop, LT/FSS Manager

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

TABLE OF CONTENTS
: 1.                                                EXECUTIVE 

==SUMMARY==
 ................................................................................................................................. 8
: 2.                                                 SURVEY UNIT DESCRIPTION ....................................................................................................................... 8
: 3.                                                CLASSIFICATION BASIS ................................................................................................................................. 8
: 4.                                                DATA QUALITY OBJECTIVES .................................................................................................................... 11
: 5.                                                 SURVEY DESIGN ............................................................................................................................................. 14
: 6.                                                SURVEY IMPLEMENTATION ...................................................................................................................... 18
: 7.                                                 SURVEY RESULTS .......................................................................................................................................... 19
: 8.                                                 QUALITY CONTROL ...................................................................................................................................... 55
: 9.                                                 INVESTIGATIONS AND RESULTS .............................................................................................................. 56
: 10.                             REMEDIATION AND RESULTS ................................................................................................................... 56
: 11.                             CHANGES FROM THE FINAL STATUS SURVEY PLAN ........................................................................ 56
: 12.                             DATA QUALITY ASSESSMENT ................................................................................................................... 56
: 13.                             ANOMALIES ..................................................................................................................................................... 57
: 14.                             CONCLUSION ..................................................................................................................................................          57
: 15.                             REFERENCES................................................................................................................................................... 57
: 16.                             ATTACHMENTS ..............................................................................................................................................          58

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

LIST OF TABLES

Table 3 Statistical Quantities for Cs-137 and Co-60 from the Characterization Survey of 8100 .................... 9 Table 3 Off-Site Analysis for Characterization Samples in 8100 ....................................................................... 9 Table 4 Base Case DCGLs for Soil ..................................................................................................................... 13 Table 4 Operational DCGLs for Soil .................................................................................................................. 14 Table 5 Action Levels for Survey Unit 8102 ....................................................................................................... 15 Table 5 Random Sample Locations .................................................................................................................... 16 Table 5 Judgmental Sample Locations ............................................................................................................... 16 Table 5 Investigation Levels ................................................................................................................................         17 Table 5 Synopsis of Survey Design ...................................................................................................................... 18 Table 7 Synopsis of Scan Results ........................................................................................................................ 20 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Samples Comprising the Statistical Sample Population ........................................................................................................................... 49 Table 7 Basic Statistical Properties of Random Sample Population and Survey Unit Dose   .......................... 51 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples .... 52 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples .................. 55 Table 16 Survey Unit 8102 Complete Scan Data ............................................................................................... 65 Table 16 Survey Unit 8102 Sign Test .................................................................................................................. 68 Table 16 Survey Unit 8102 QC Assessment ....................................................................................................... 70

LIST OF FIGURES

Figure 7 Survey Unit 8102 GW                   -1 GPS Scan Results ......................................................................................... 21 Figure 7 Survey Unit 8102 GW                   -1 Z-Score                ......................................................................................................... 22 Figure 7 Survey Unit 8102 GW                  -1 Samples (Locations 23-                    25) .......................................................................... 23 Figure 7 Survey Unit 8102 GW                  -2 GPS Scan Results ......................................................................................... 24 Figure 7 Survey Unit 8102 GW                  -2 Z-Score                ......................................................................................................... 25 Figure 7 Survey Unit 8102 GW                  -3 GPS Scan Results ......................................................................................... 26 Figure 7 Survey Unit 8102 GW                  -3 Z-Score                ......................................................................................................... 27 Figure 7 Survey Unit 8102 GW                   -3 Samples (Locations 19-                    22) .......................................................................... 28 Figure 7 Survey Unit 8102 GW                  -4 GPS Scan Results ......................................................................................... 29 Figure 7 Survey Unit 8102 GW                   -4 Z-                          Score ....................................................................................................... 30 Figure 7 Survey Unit 8102 GW                    -5 GPS Scan Results ....................................................................................... 31 Figure 7 Survey Unit 8102 GW                    -5 Z-                          Score ....................................................................................................... 32 Figure 7 Survey Unit 8102 GW                    -5 Sample (Location 18)    ................................................................................. 33 Figure 7 Survey Unit 8102 GW                    -6 GPS Scan Results ....................................................................................... 34 Figure 7 Survey Unit 8102 GW                    -6 Z-                          Score ....................................................................................................... 35 Figure 7 Survey Unit 8102 GW                    -6 Samples (Locations 15-17) ........................................................................ 36 Figure 7 Survey Unit 8102 GW                    -7 GPS Scan Results ....................................................................................... 37 Figure 7 Survey Unit 8102 GW                    -7 Z-                          Score ....................................................................................................... 38 Figure 7 Survey Unit 8102 GW                    -8 GPS Scan Results ....................................................................................... 39 Figure 7 Survey Unit 8102 GW                    -8 Z-                          Score ....................................................................................................... 40 Figure 7 Survey Unit 8102 GW                    -9 GPS Scan Results ....................................................................................... 41

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

Figure 7 Survey Unit 8102 GW                    -9 Z-                          Score ....................................................................................................... 42 Figure 7 Survey Unit 8102 GW                    -9 Samples (Locations 31-35) ........................................................................ 43 Figure 7 Survey Unit 8102 GW                    -10 GPS Scan Results ..................................................................................... 44 Figure 7 Survey Unit 8102 GW                    -10 Z-Score ..................................................................................................... 45 Figure 7 Survey Unit 8102 GW                    -10 Samples (Locations 26 -30) ...................................................................... 46 Figure 7 Survey Unit 8102 QC GW                    -10 GPS Scan Results .............................................................................. 47 Figure 7 Survey Unit 8102 QC GW                    -10 Z-                          Score ..............................................................................................         48 Figure 16 Survey Unit 8102 Scan and Sampling Location Map   ....................................................................... 60 Figure 16 Survey Unit 8102 Random Sample Locations Map   .......................................................................... 61 Figure 16 Survey Unit 8102 Judgmental Sample Locations Map Sample 015 to 025     .................................... 62 Figure 16 Survey Unit 8102 Judgmental Sample Locations Map Sample 026 to 035     .................................... 63 Figure 16 Quantile Plot for Cs-137 Concentration ............................................................................................ 74 Figure 16 Histogram for Cs-137 Concentration ................................................................................................         75 Figure 16 Retrospective Power Curve for Survey Unit 8102  ............................................................................ 76

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

LIST OF ABBREVIATIONS delta
/                                                                                                                                                                                                     relative shift sigma ALARA                                                                                                               as low as is reasonably achievable BcDCGL                                                                                            base case derived concentration guideline level BcSOF                                                                                                                                      base case sum of fractions cpm                                                                                                                                                                                         counts per minute DQA                                                                                                                                                                    data quality assessment DQO                                                                                                                                                                    data quality objective DCGL                                                                                                                                       derive                        d concentration guideline level DCGLW                                                                                                                    derived concentration guideline level wide area FCS                                                                                                                                                                                    Fort Calhoun Station FSS                                                                                                                                                                                         final status survey GPS                                                                                                                                                                                 Global Positioning System HTD                                                                                                                                                                       hard-to-detect IC                                                                                                                                                                                                                          insignificant contributor LBGR                                                                                                                                          lower bound of the gray region LT/FSS                                                                                                                            License Termination/Final Status Survey LTP                                                                                                                                                                                    license termination plan m                                                                                                                                                                                                                                    meter MARSSIM                                                       Multi-Agency Radiation Survey and Site Investigation Manual MDC                                                                                                                                                            minimum detectable concentration mrem/yr                                                                                                               millirem per year NaI                                                                                                                                                                                                  sodium iodide NRC                                                                                                                                                                       Nuclear Regulatory Commission OpDCGL                                                                                         operational derived concentration guideline level

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

OpSOF                                                                                                                                  operational sum of fractions pCi/g                                                                                                                                                               picocuries per gram QAPP                                                                                                                                               quality assurance project plan QC                                                                                                                                                                                                       quality control ROC                                                                                                                                                                       radionuclides of concern SOF                                                                                                                                                                                 sum of fractions TEDE                                                                                                                                               total effective dose equivalent TSD                                                                                                                                                                               technical support document UBGR                                                                                                                                      upper bound of the gray region VSP                                                                                                                                                                                 visual sample plan

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA
: 1.                                                          EXECUTIVE 

==SUMMARY==

This final status survey (F                                   SS) release record for Survey Unit 8102, North Owner                                    Controlled Area, has been generated in accordance with procedure FCSD           -RA-LT-305,                                                           Final Status Survey Data Reporting (Reference 1) and satisfies the requirements of             Section 5.7.1 of the                                                                                                                                                                         Fort Calhoun Station Decommissioning Project License Termination Plan  (FCS           ; LTP;                                                                                                  Reference 2).
An FSS sample plan for this survey unit was developed in accordance with procedure FCSD-RA-LT-302,                                                           Final Status Survey Sample Plan                                     Development (Reference 3), the FCS                                    LTP, and with guidance from NUREG-1575, Revision 1,                                               Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM; Reference 4).
Survey Unit 8102, an open land survey unit, has a MARSSIM classification of                                                                                                                          3. A survey plan was designed based upon use of the Sign Test as the nonparametric statistical test for compliance             .
Both the Type I () and Type II () decision error rates were set at 0.05. As a random sample population, 14 soil samples were acquired from the survey unit. In addition, soil scanning was performed on 10% of the total surface area in the survey unit. T                           he analytical results for all  soil samples, both random and judgmental, taken in Survey Unit 8102 indicate that the                                                                                                                                                                                          maximum s                                                 um of fractions (SOF), considering the concentration of all applicable radionuclides of concern (ROC), is equal to 0.2154 when applying the respective operational derived                                     concentration guideline levels (OpDCGLs) for soil. Therefore, the null hypothesis is rejected and Survey Unit 8102 is acceptable for unrestricted release.                                                                                                             The mean SOF when applying the respective             base                         case derived concentration guideline levels(BcDCGL                              s) for soil is 0.0296. This SOF equates to a dose for the survey unit of 0.7404 milliremper year (                                                                                                                                     mrem/yr).
: 2.                                                          SURVEY UNIT DESCRIPTION

Survey Unit 8102is an impacted Class                                                                                                                                                                       3 open land survey unit. The                         surfacearea of the survey unit is 74,685 meters (m)2.
The boundary of the survey unit and the location of the soil samples were defined using a Global Positioning System (GPS). Refer to                                           Attachment 1 of this report for              a figure depicting Survey Unit 8102.
: 3.                                                          CLASSIFICATION BASIS

Survey Unit 8102was identified in                                                                                                              the technical support document (TSD) 20-001, Historical Site Assessment for Fort Calhoun Station  (Reference5                                                      ) as a Class             3 survey unit. The initial site characterization surveys were conducted between November 2019 and July 2020. The                                                                                                                                    following summarizes the results of the characterization survey for Survey Unit 8102.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

During open land characterization, accessible land areas were sampled within Survey Area 8100.
Some survey units were not samples due to limited accessibility and the random survey design.
Samples were unable to be collected in Survey Unit 8102 due to flooding of the survey unit at the time of characterization. Therefore, the summation of characterization data from Survey Area 8100 is being applied to Survey Unit 8102.
In total, 82 surface soil samples were collected in Survey Area 8100. All samples were analyzed by the on-site gamma spectroscopy system. Cs-137 was detected at concentrations above minimum detectable                         concentration (MDC) in 35 of the samples, at a maximum concentration of 3.16E-01 picocuries/gram (pCi/g). Co-60 was not detected at concentrations above MDC in any of the surface soil samples . A summary of the analyses for surface soil                         samples             taken during site characterization are presented in Table             3-1. Eight                        surface soil samples were sent to  GEL Laboratories for off-                 site analysis of the initial suite of radionuclides. A summary of the off-                                              site analyses of Survey Area 8100 is presented in                                                                                                                                                                                    Table             3-2.

Table 3 Statistical Quantities for Cs                                                                         -137 and Co-60 from the Characterization Survey of 8100 Surface Soil                          Co-60             Cs-137
                                                             # of Samples                                                                                                                                                                                                                                                                                                                    82
                                                                # >MDC                                                                                                                                                                                                                                                           0                                                                                                                                                                 35 Mean (pCi/g)                                                                                                                                                       2.59E-02                                           1.33E-01 Median (pCi/g)                                                                                                                                       2.10E-02                                           1.26E-01 Max (pCi/g)                                                                                                                                                                1.15E-01                                           3.16E-01 Min (pCi/g)                                                                                                                                                              0.00E+00                                                                         0.00E+00 Standard Deviation (pCi/g)                                         2.37E-02                                           7.21E-02

Table 3 Off                                                                       -Site Analysis for Characterization Samples  in 8100 Radionuclides                          8100X-3-CJ-                           8100X-3-CJ-                          8100X-3-CJ-                          8100X-3-CR-GSSX-044                              GSSX-058                             GSSX-064                             GSSX-003 Am-241                               7.07E-02                             2.72E-02                              4.72E-02                             0.00E+00 Sb-125                              4.66E-02                             2.70E-02                              6.77E-02                             0.00E+00 C-14                             0.00E+00                              1.37E-01                              1.07E-01                             0.00E+00 Ce-144                              1.02E-01                             0.00E+00                             0.00E+00                              7.80E-02 Cs-134                              8.37E-02                             1.87E-02                              5.11E-02                             4.36E-02 Cs-137                              1.72E-01                             1.80E-01                              1.24E-01                             1.29E-01 Co-57                              4.55E-03                             0.00E+00                              6.78E-03                             0.00E+00 Co-58                             0.00E+00                              1.75E-02                             0.00E+00                              4.06E-02 Co-60                             0.00E+00                              0.00E+00                             0.00E+00                              5.21E-03 Cm-242                              0.00E+00                              0.00E+00                              2.57E-02                             0.00E+00

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Radionuclides       8100X-3-CJ-          8100X-3-CJ-         8100X-3-CJ-        8100X-3-CR-GSSX-044            GSSX-058            GSSX-064            GSSX-003 Cm-243/244           0.00E+00             3.58E-02            9.67E-02            8.71E-03 Eu-152             6.02E-03             1.11E-03            8.78E-02           0.00E+00 Eu-154             0.00E+00             5.66E-03            1.29E-01           0.00E+00 Eu-155             7.90E-02             1.90E-02            1.79E-02            6.16E-02 Fe-55             2.18E+00            2.45E+00            4.43E+00            3.18E+00 Mn-54              7.75E-03            0.00E+00             1.94E-02            3.03E-02 Np-237             0.00E+00            0.00E+00             8.29E-04            1.12E-03 Ni-59             0.00E+00            0.00E+00            0.00E+00             1.39E-01 Ni-63             0.00E+00            0.00E+00             5.00E-01            4.13E-01 Nb-94             5.79E-02             3.37E-03            3.50E-02            8.78E-03 Pu-238             0.00E+00             2.85E-03            1.50E-02            4.90E-03 Pu-239/240           7.86E-03             1.35E-02            1.73E-02           0.00E+00 Pu-241             1.26E+00            1.36E+00            2.17E+00            0.00E+00 Ag-110m             2.08E-02            0.00E+00             7.33E-02           0.00E+00 Sr-90             1.33E-01             1.09E-01            1.33E-01            1.44E-01 Tc-99             0.00E+00            0.00E+00            0.00E+00            0.00E+00 H-3              0.00E+00            0.00E+00            0.00E+00            0.00E+00 Zn-65             7.12E-02             2.89E-03            8.45E-03            4.71E-03

Radionuclides                8100X-3-CR-8100X-3-CR-         8100X-3-CR-         8100X-3-CR  -
GSSX-021            GSSX-027            GSSX-029            GSSX-038 Am-241             1.20E-02             1.26E-02           0.00E+00            0.00E+00 Sb-125             1.16E-01             2.24E-02            1.74E-03            1.22E-01 C-14              0.00E+00             4.79E-01           0.00E+00             2.73E-01 Ce-144             2.28E-01             7.07E-02           0.00E+00             2.41E-01 Cs-134             0.00E+00             4.96E-02            9.19E-02           0.00E+00 Cs-137             2.05E-01            3.08E-01            4.96E-01             1.41E-01 Co-57             2.37E-03            0.00E+00             5.95E-02            8.79E-03 Co-58             6.82E-02            0.00E+00             6.93E-02            4.28E-02 Co-60             2.29E-02             2.98E-02           0.00E+00            0.00E+00 Cm-242             0.00E+00            0.00E+00            0.00E+00            0.00E+00 Cm-243/244           2.23E-02             2.50E-02            1.20E-02            7.52E-03 Eu-152             0.00E+00            0.00E+00             2.82E-01            2.67E-02 Eu-154             3.91E-02             7.78E-02            7.35E-03           0.00E+00 Eu-155             4.19E-02             5.79E-02            6.79E-02           0.00E+00 Fe-55             1.88E+00            0.00E+00            2.30E+00            4.32E+00 Mn-54              3.95E-03             4.56E-02           0.00E+00             4.32E-03

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

Radionuclides              8100X-3-CR-                 8100X-3-CR-                8100X-3-CR-                8100X-3-CR-GSSX-021                   GSSX-027                   GSSX-029                    GSSX-038 Np-237                     1.39E-03                   1.89E-03                  0.00E+00                   0.00E+00 Ni-59                    7.57E-01                   7.73E-01                  0.00E+00                   1.17E+00 Ni-63                    3.50E-01                  0.00E+00                    4.64E-01                   4.66E-01 Nb-94                     1.54E-02                  0.00E+00                    1.79E-01                  0.00E+00 Pu-238                   0.00E+00                    5.67E-03                   1.90E-02                   4.82E-03 Pu-239/240                   2.29E-02                   1.16E-02                   9.91E-03                   1.06E-02 Pu-241                   0.00E+00                    8.17E-01                  1.76E+00                   1.70E+00 Ag-110m                    0.00E+00                   0.00E+00                   0.00E+00                    6.39E-02 Sr -90                   5.79E-02                  0.00E+00                    3.00E-02                  0.00E+00 Tc-99                    0.00E+00                   0.00E+00                   0.00E+00                    6.42E-03 H-3                    0.00E+00                   0.00E+00                   0.00E+00                   0.00E+00 Zn-65                    0.00E+00                   0.00E+00                   0.00E+00                   0.00E+00 Note: Bold values indicate concentration greater than MDC. Unbolded values indicate the value below MDC.
All values in pCi/g.

Based upon a                                                                                                                                                 review of the historical information, the results of the   characterization survey data, and completion of a Survey Unit Classification Worksheet, the correct final classification of Survey Unit 8102was determined to be Class                                                                                                               3.
: 4.                                                         DATA QUALITY OBJECTIVES

FSS planning and design rely                                                                                             on a properly executed                                                                         data                                     quality                         objective (DQO) process to ensure, through compliance with explicitly defined inputs and boundaries, that the primary objective of the survey is satisfied. The DQO process, utilized in accordance with MARSSIM,                                                                                                                                             is described in the  FCS LTP. The appropriate design for a given survey was                                                                                                                                      developed using the DQO process as outlined in Appendix D of MARSSIM                                   . A summary of the                         seven steps of the DQO process are outlined in the following paragraph.
The DQO process incorporates hypothesis testing and probabilistic sampling distributions to control decision errors during data analysis. Hypothesis testing is a process based on the scientific method that compares a baseline condition to an alternate condition. The baseline condition is technically known as the null hypothesis. Hypothesis testing rests on the premise that the null hypothesis is true, and sufficient evidence must be provided to reject it in favor of the alternative hypothesis. In designing the survey plan, the underlying assumption, or null hypothesis, was that residual activity in the survey unit exceeded the release criteria  . Rejection of the null hypothesis would indicate that residual activity within the survey unit does not exceed the release criteria   .
Therefore, the survey unit would satisfy the primary objective of the FSS sample             plan.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

The primary objective of the FSS sample plan is to demonstrate that the level of residual radioactivity in Survey Unit 8102 did not exceed the release criteria specified in the LTP and that the potential dose from residual radioactivity is   as low as is reasonably achievable (ALARA).
TSD 21-043,Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan (Reference6)                                                                               establishes                      the basis for an initial suite of potential ROC for decommissioning. LTP Chapter 2 provides detailed characterization data that describes the results of surveys completed of soil. Surface                                     samples were taken in each impacted open land survey unit and analyzed for the presence of plant-derived radionuclides. The results of surface soil characterization in the impacted area surrounding FCS indicate that there is minimal residual radioactivity in soil.
Insignificant contributors (ICs) were determined consistent with the guidance contained in Section 3.3 of NUREG            -1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance
- Characterization                                    , Survey, and Determination of Radiological Criteria  (Reference             7). For soil, the ROCs were found to be Cs-137, Co-60, Eu-152, and C-14. The remaining radionuclides were designated as IC and were eliminated from further detailed evaluation.
Section 5.2.6 of the LTP states that each radionuclide specific B            cDCGL is equivalent to the level of residual radioactivity (above background levels) that could, when considered independently, result in a total effective dose equivalent (TEDE) of 25 mrem/yr to an Average Member of the Critical Group. To ensure that the summation of dose from each source term is 25 mrem/yr or less after all FSS is completed, the  BcDCGLs are reduced based on an expected, or  a priori, fraction of the 25 mrem/yr dose limit from each source term. The reduced DCGLs (i.e., OpDCGLs                                                       ) can be related to the BcDCGLs as an expected fraction of dose based on an a priori                                     assessment of what the expected dose should be based on the results of site characterization, process knowledge, and the extent of planned remediation. The OpDCGL is then used as the DCGL for the FSS design of the survey unit (e.g., calculation of surrogate DCGLs or, investigation levels). Details of the OpDCGLs derived for each dose component and the basis for the applied a priori dose fractions are provided in Section 5.2.6 of the LTP.
Multiple ROCs are known to be present at FCS           . The dose contribution from each ROC is accounted for using the SOF to ensure that the total dose from all ROC does not exceed the dose criterion. A BcDCGL that is established for the average residual radioactivity in a survey unit is equivalent to a derived concentration guideline level wide area (            DCGLW) as defined in MARSSIM.
At FCS, compliance is demonstrated through the summation of dose from seven distinct source terms (i.e., basements, soils, buried pipe,                                     embedded pipe, above-ground structures, basement fill, and groundwater) for the end state. When applied to soil, the DCGLs are expressed in units of activity per unit of mass (pCi/g).

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

For FCS, soil is             defined as a layer of soil beginning at the surface but extending to a depth of 1 m to allow for flexibility in compliance demonstration if contamination deeper than 0.15 m is encountered. Based on characterization data and historical information, there are no expectations of encountering a source term geometry that is comprised of a clean surface layer of soil over a contaminated subsurface soil layer. Section 6.9 of the LTP provides the exposure scenarios and modeling parameters that were  used to calculate the site-                                   specific soil DCGLs. The adjusted soil DCGLs for the unrestricted release of open land survey units as provided in the Section 6.16 of the LTPare                                                                                                  pre                        sented in Table 4-1. The IC dose percentage of                                                 5% was used to adjust the DCGLs in Table                                     4-1 to account for the dose from the eliminated IC radionuclides.

Table 4 Base Case DCGLs for Soil Surface Soil                Subsurface Radionuclide                  BcDCGL                  Soil BcDCGL (pCi/g)                     (pCi/g)
C-14                                                                                                                                                                                      5.70E+01                                                                                                                                                    9.68E+00 Co-60                   3.77E+00                    2.93E+00 Cs-137                                                                                                                                                1.31E+01                                                                                                                                                 7.27E+00 Eu-152                                                                                                                                               8.41E+00                                                                                                                                                    7.36E+00

The reduced DCGLs, OpDCGLs, are calculated using                         Equation 5-1 from Chapter 5 of the LTP, shown as Equation 4-1 below                                   .

Equation 4 OpDCGL Calculation

The OpDCGLs for the unrestricted release of               soil are provided in Table                                    4-2.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

Table 4 Operational DCGLs for Soil Surface Soil            Subsurface Radionuclide               OpDCGL                       Soil (pCi/g)              OpDCGL (pCi/g)
C-14                                                                                                                                                                                      1.59E+01                                                                                                                                      2.71E+00 Co-60                                                                                                                                         1.06E-00                                                                                                       8.21E-01 Cs-137                                                                                                                                                3.65E+00                                                                                                                                          2.04E-00 Eu-152                2.36E+00                2.06E-00

Instrument DQOs included a verification of the ability of the survey instrument to detect the radiations of interest relative to the OpDCGL . Survey instrument response checks were required prior to issuance and after the instrument had been used. Control and accountability of survey instruments were required to assure the quality and prevent the loss of data.
As part of the DQOs applied to laboratory processes, analysis results were reported as actual calculated results. The actual                                            reported value was used as the recorded FSS result for measurement and sample values that are less than MDC. Negative values were recorded as zero                        . Results were not reported as less than MDC. Sample report summaries included unique sample identification, analytical method, radionuclide, result, uncertainty, laboratory data qualifiers, units, and the observed MDC.
In accordance with the LTP, for laboratory analysis, MDCs less than 1 0% of the OpDCGL were preferable while MDCs up to 50% of the OpDCGL were            acceptable. The minimum acceptable MDC for measurements obtained using field instruments was 50% of the applicable OpDCGL.
: 5.                                                         SURVEY DESIGN

The level of effort associated with planning a survey is based on the complexity of the survey and nature of the hazards. Guidance for preparing FSS plans is provided in procedure                                     FCSD-RA-                                                                  LT-302, Final Status Survey Sample Plan                                     Development (Reference 3).
The DQO process validated that Co                                    -60, Cs                                                                        -137, Eu                                                                       -152, and C-14 would be the ROC in Survey Unit 8102 as presented in LTP Section                                                                                                                         5.2.5. As discussed in LTP Section                                                                                                                          5.2.6.2, instead of inferring the  concentrations for the hard           -to-detect (HTD) ROC                                               C-14 using a surrogate approach, 100%                                                                         of all samples collected in the survey unit were sent for off -site analysis for C-14. Table                         5-1 presents the action levels for Survey Unit 8102 sample results and are based on 50% of the OpDCGLs.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

Table 5 Action Levels for Survey Unit                                                                         8102 ROC                            Action Level (pCi/g)
Co-60                                                                                                                                                                                                                                                    5.30E-01 Cs-137                                                                                                                                                                                                                                                            1.83E+00 Eu-152                                                                                                                                                                                                                                                           1.18E+00 C-14                                                                                                                                                                                                                                                                                                  7.95E+00

The Sign Test was selected as the nonparametric statistical test  to demonstrate compliance             with the release criteria. The use of the Sign Test did not require the selection or use of a background reference area, which simplified survey design and implementation                                                            . This approach was conservative since it included background Cs-137 as part of the sample set.

The number of soil samples for FSS was determined in accordance with procedureFCSD                                  -RA-LT-302 (Reference                                                                                                                                               3). The relative shift (/) for the survey unit data set is defined as shift (),
which is the upper boundary of the                                     gray                        region (UBGR), or the DCGL (SOF of 1), minus the lower bound of the gray region (LBGR)                                                                        , divided by sigma (), which is the standard deviation of the data set used for survey design. The optimal value for / should range between 1 and 3. The largest value the / can have is 3. If the calculated value of / exceeds 3, an adjusted value of 3 will be used for /. The / for                         Survey Unit 8102, based                                                                         on the data for surface soil samples collected during the                                                             characterization             of Survey Area                                     8100, was calculated as follows:

Equation 5 Relative Shift

                                                                          =                (1                 0.0716)=               25.8 0.036

As the calculated / was greater than 3, a value of 3 was used as the adjusted /. Both the Type I error (i.e.,  value                                        ) and the Type II error (i.e.,  value)                             were set at 0.05. The sample size from Table 5.5 of MARSSIM that equates to the Type I and Type II error of 0.05 for use with the Sign Test is an N value of 14.

A prospective                         power                        curve was generated using MARSSIM Power 2000, a software package developed under the sponsorship of the United States Nuclear Regulatory Commission (NRC) for implementation of the MARSSIM in support of the decommissioning license termination rule (10 CFR 20, Subpart E). The result of the MARSSIM Power 2000 computer run showed adequate power for the survey design.

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Given that the survey unit is Class             3, sample locations were selected             randomly. The                                                random locations of the soil             samples were selected using Visual Sample Plan (VSP)             , in accordance with FCSD-RA-LT-302 (Reference                                                                                                                                               3). Input parameters included use of aerial photographs and the random sampling tool set with a predetermined number (14) of samples              . The random coordinates generated with VSP were integrated with a GPS to identify              sample locations in the field.               Table 5-2lists the                                     random samples collected for FSS and the corresponding GPS coordinates, based on the Nebraska State Plan            e North American Datum 1983 coordinate system                                                                                                                        .

Table 5 Random Sample Locations Sample ID                             Northing                  Easting 8102X-3-FR-GSSX-001                            195563.424               826282.034 8102X-3-FR-GSSX-002                            195378.477               826415.711 8102X-3-FR-GSSX-003                            195404.071               826429.572 8102X-3-FR-GSSA-004                            195556.180               826279.270 8102X-3-FR-GSSX-005                            195429.912               826452.051 8102X-3-FR-GSSX-006                            195321.831               826415.619 8102X-3-FR-GSSX-007                            195372.693               826442.943 8102X-3-FR-GSSX-008                            195379.051               826488.483 8102X-3-FR-GSSX-009                            195353.620               826424.915 8102X-3-FR-GSSX-010                            195277.328               826476.339 8102X-3-FR-GSSX-011                            195226.466               826458.123 8102X-3-FR-GSSX-012                            195150.173               826512.771 8102X-3-FR-GSSX-013                            195201.035               826540.095 8102X-3-FR-GSSX-014                            195264.612               826585.636

In accordance with the sample plan, at least one judgmental sample is required from the survey unit. The number of judgmental samples collected was             21, which brings the total number of samples collected for the FSS of Survey Unit 8102 to 35. Table                                                                                                            5-3                         lists the judgmentalsamples collected for FSS and the corresponding GPS coordinates.

Table 5 Judgmental Sample Locations Sample ID                            Northing                  Easting 8102X-3-FJ                                                                                                      -GSSX-015                                                                                                                                         195231.859                                 826527.650 8102X-3-FJ                                                                                                      -GSSX-016                                                                                                                                         195220.897                                 826518.914 8102X-3-FJ                                                                                                      -GSSX-017                                                                                                                                         195237.580                                 826535.477 8102X-3-FJ-GSSX-018                           195169.528             826514.486 8102X-3-FJ                                                                                                      -GSSX-019                                                                                                                                         195184.116                                 826539.617 8102X-3-FJ                                                                                                      -GSSX-020                                                                                                                                         195175.137                                 826528.849

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Sample ID                                                Northing                               Easting 8102X-3-FJ                                                                                                      -GSSX-021                                                                                                                                         195161.791                                 826532.962 8102X-3-FJ-GSSX-022                                                  195166.851                           826536.386 8102X-3-FJ-GSSX-023                                                  195268.947                           826501.259 8102X-3-FJ                                                                                                      -GSSX-024                                                                                                                                         195252.990                                 826516.017 8102X-3-FJ                                                                                                      -GSSX-025                                                                                                                                         195272.188                                 826490.791 8102X-3-FJ                                                                                                      -GSSA-026                                                                                                                                         195223.403                                 826545.771 8102X-3-FJ                                                                                                      -GSSX-027                                                                                                                                         195215.830                                 826546.333 8102X-3-FJ                                                                                                      -GSSX-028                                                                                                                                         195218.443                                 826523.451 8102X-3-FJ                                                                                                      -GSSX-029                                                                                                                                         195206.448                                 826533.304 8102X-3-FJ-GSSX-030                                                  195208.004                           826540.917 8102X-3-FJ                                                                                                      -GSSX-031                                                                                                                                         195183.896                                 826558.689 8102X-3-FJ                                                                                                      -GSSX-032                                                                                                                                         195200.997                                 826532.302 8102X-3-FJ                                                                                                      -GSSX-033                                                                                                                                         195180.627                                 826554.055 8102X-3-FJ                                                                                                      -GSSX-034                                                                                                                                         195208.430                                 826529.141 8102X-3-FJ                                                                                                      -GSSX-035                                                                                                                                         195173.029                                 826552.745

The implementation of quality control (QC)            measures as referenced by Section 5.6.3 of                                    the LTP and FCSD                                                           -RA-                                                                  LT-100,                                                           Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station (QAPP; Reference 8), includes the collection of a soil sample for split sample analysis on 5                          % of the soil samplestaken in a survey unit with the locations selected at random.                                                      Four soil             samples, 8102X-3-FR-GSSB-004, 8102X-3-FQ-GSSX-007, 8102X-3-FQ-GSSX-031, 8102X                                  FJ-GSSB-026, were designated for splitor duplicate                                                                                    sample             QC analysis for the FSS of Survey Unit 8102.
Section 5.3.4 and Table 5                                                            -20 of the LTP                                                             specify that for Class                             3 open land survey units, surface scans will be performed on a judgmental percentage of the surface area in the survey unit            . For Survey Unit 8102, 10% scan coveragewas selected                                                                                                                                              , which equals 7,469 m2.
For this Class 3 open land survey unit, the Investigation Levels for area scanning and soil sample measurement results are those levels specified in Table 5   -24 of the LTP and are reproduced below in Table                                     5-4.

Table 5 Investigation Levels Classification                                                            Scan Investigation Levels                                                                            Direct Investigation Levels

Class 3                                                                                                                                                                        >Operational DCGL or >MDCscan if MDCscan is greater than Operational DCGL                                                                                                                                                                                                                                                              >0.5 Operational DCGL

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Table 5-5 provides a synopsis of the survey design for                                                             Survey Unit 8102.

Table 5 Synopsis of Survey Design Feature                                                           Design Criteria                                                                      Basis Survey Unit Surface Area                                                                                                                                                                                                                                                                          74,685 m2                                                                                                                                                                                                                                                                                                                                                                                                                                               GPS Number of Random Samples                                                                              14                                                    *                         / = 3 (adjusted)
(N)
* MARSSIM Table 5.5
* Co-60:                       1.06 pCi/g
* Cs-137: 3.65 pCi/g Operational DCGLs for surface DCGLs
* Eu-152: 2.36 pCi/g                           soil, LTP,                                                                         Table 5-8
* C-14: 15.9 pCi/g Scan and Direct Investigation                                                                                                                                    ,                                                                         Table 5-24 Levels                                                                                                                                                                                                                                                                                                                                                                                                                                           Table 5-4                                                                                                                                                                                                                                                                                                                                                           LTP Scan Areal Coverage                                                                                                                                               7,469 m2, 10% areal coverage                                                                                                                                                                                                            LTP, Table 5-20 Judgmental Samples                                                                                                                                                                                                                                                                                                                                                                                       1 Per Survey Design 21                                                Actual Number Obtained HTD ROC Analysis                                                                                                                                                                                                                                                                                                                                                      100% LTP, Section 5.2.6.2 35                                           Number of Samples Analyzed 1 duplicate and 1 split sample                                                        LTP, Section 5.6.3 QC                                                        selected at random                                                 Actual Number Obtained 4
: 6.                                                         SURVEY IMPLEMENTATION

For Survey Unit 8102, compliance with the unrestricted release criteria was demonstrated through a combination of soil scanning with a Ludlum Model 44-20 gamma detector                                                             and the sampling of soil for isotopic analysis .
A License Termination/Final Status Survey (LT/FSS) Supervisor performed a visual inspection and walk-down of the survey unit on February 2, 2022, prior to performing FSS. The purpose of the walk-down was to assess the physical condition of the survey unit, evaluate access points and travel paths, and identify potentially hazardous conditions. At the time of survey, the soil in the survey unit was dry and free of any considerable constraint for the collection of samples and scan measurements.
FSS field activities were conducted  under the FSS            sample plan, which included DQOs, survey design, detailed FSS instructions, job safety analysis, and related procedures for reference. FSS field activities were projected to take 10 working days to complete. Daily briefings were

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conducted to discuss the expectations for job performance and to review the            safety aspects of the job. A Field Log                                                                        was used to document field activities and other information pertaining to the performance of the FSS. FSS field activities commenced on                         February 22, 2022, and were concluded on March                                     1, 2022.
A total of10                             different scan areas were scanned using a Ludlum Model 3001 paired with a Ludlum Model 44-20 (3 x 3) sodium iodide (NaI) detector and                                                                                          a Trimble GPS unit. The background was established as the average of five one-                      minute static measurements, while maintaining the detector 6 from the soil. In  Survey Unit 8102, background ranged from 22,460 counts per minute (cpm) up to             24,400 cpm.
All designated scan areas were scanned using  the Model 44-20 detector operated in the rate-                                             meter mode and using audio response. The probe was positioned no more than 2 from the ground and was moved at a scan speed of approximately 0.25 m per second. In accordance with                                                                                                 FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors                                                           (Reference             9), scan MDC was sufficient to detect residual radioactivity at the action level. Complete scan results are provided in Attachment 2.
The 14 random sample locations were marked with             flags based on GPS coordinates provided.
Each soil sample consisted of approximately 1 liter of soil. The soil sample media was sifted to remove stones and other media larger than 1 centimeter in diameter. All soil             samples were collected, controlled, transported, stored, and transferred to the on                                                -site laboratory using the chain-of-custody process from                                                                                     FCSD-RA-LT-205,                                                           Chain-of-Custody Protocol for Site Characterization and Final Status Survey  (Reference             10), and in accordance with FCSD                                                                                   -RA-                                                                  LT-203, Sample Media Collection for Site Characterization and Final Status Survey   (            Reference 11) and FCSD                                                           -RA-                                                                  LT-204,                                                           Sample Media Preparation for Site Characterization and Final Status Survey (Reference 12).
The survey design specified that 100% of the             samples were required for the HTD ROC analysis.
In total, 35 samples were selected for HTD radionuclide analysis.
The implementation of survey specific QC measures included the collection of four             sample           s (8102X-FR-GSSB-004, 8102X-3-FQ-GSSX-007, 8102X-3-FQ-GSSX-031, and 8102X-3-FJ-GSSB-026) for split                                                                         and/or duplicate sample analysis.
: 7.                                                         SURVEY RESULTS

All areas identified in the FSS  sample plan were scanned for elevated activity levels.             The 7,469 m2 scan requirement was              exceeded by scanning 10                                                            areas, GW                                                             -1 through GW-10, within accessible land. Figure 16                                    -1 in Attachment 1 presents the scan areas within the unit.                                                                         Judgmental samples did not have an Action Level, as the readings were taken to verify the readings identified

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in the Z-Score analysis. Table 7-1provides an overview of the scan results for all 1                                     m2 scan areas around each random sample location and the gamma walkovers. Complete scan results are provided in Attachment 2, Table                                                 16-1.

Table 7 Synopsis of Scan Results

Min Scan            Max Scan                Action                Scan Scan Area              Logged              Logged                 Level             Alarms?             Investigation Reading              Reading                (cpm)                (Y/N)                Samples (cpm)                (cpm) 1                10886                27300                25640                   Y                      0 2                10886                26100                25640                   Y                      0 3                10886                24200                25640                   N                      0 4                10886                24300                25640                   N                      0 5                10886                26500                25640                   Y                      0 6                10886                22400                25640                   N                      0 7                10886                22500                25640                   N                      0 8                10886                26400                25640                   Y                      0 9                10886                22700                25640                   N                      0 10                10886                23300                25640                   N                      0 11                10886                26100                25640                   Y                      0 12                10886                23100                25640                   N                      0 13                10886                26500                25640                   Y                      0 14                10886                24900                25640                   N                      0 GW-1                 19227                25871                24015                   Y                      3 GW-2                 12136                26543                24776                   Y                      0 GW-3                 21649                27921                25352                   Y                      4 GW-4                 11533                26814                24653                   Y                      0 GW-5                 18034                27886                25085                   Y                      1 GW-6                 21035                26144                25241                   Y                      3 GW-7                 14346                26125                23768                   Y                      0 GW-8                 20897                26727                25044                   Y                      0 GW-9                 19951                34103                25393                   Y                      5 GW-10                 20753                26281                24900                   Y                      5 QC GW-10                 22053                28268                25763                   Y                      0

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For Survey Unit 8102 Grid                                                                                                                         GW-1, count rates ranged between 19,277 cpm and 25,871 cpm, with a mean count rate of 23,037 cpm and a standard deviation of 850 cpm. Figure                         7-1below presents a map of the gamma walkover for Survey Unit 8102 GW                                                            -1.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -1 GPS Scan Results

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An evaluation of the Survey Unit 8102 GW                                                            -1 data set was performed to assessthe                                                                                                                                                 small areas of elevated activity which exceeded standard deviations above the mean measurement (i.e., +3 Z-Score). Three locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area.                                     Figure 7-2and                                    Figure 7-3 below present maps of the gamma walkover Z-Score scan map from Survey Unit 8102 GW                                                                                    -1 and biased sampling locations.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -1 Z-Score

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Figure 7 Survey Unit 8102 GW                                                                                                                                                -1 Samples (                                    Locations 23-25)

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For Survey Unit 8102 GW                                                                                                                        -2, count rates ranged between 12,136 cpm and 26,543 cpm with a mean count rate of 23,479 cpm and a standard deviation of 1,453 cpm. Figure                         7-4below presents a map of Survey Unit 8102 GW                                                            -2 scan map.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -2 GPS Scan Results

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An evaluation of the Survey Unit 8102 GW                                                            -2 data set was performed to assess any small areas of elevated activity which exceeded three standard deviations above the mean measurement (i.e.,
+3 Z-Scores). No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-5below presents a map of the +3 Z                                                            -Score measurements within Survey Unit 8102 GW                                    -2.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -2 Z-Score

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For Survey Unit 8102 GW                                                                                                                        -3, count rates ranged between 21,649 cpm and 27,921 cpm, with a mean count rate of 24,216 cpm and a standard deviation of 763 cpm. Figure 7-6below presents a map of the gamma walkover  for Survey Unit 8102 GW-3.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -3 GPS Scan Results

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An evaluation of the Survey Unit 8102 GW                                                            -3 data set was performed to assessthe                                                                                                                                                 small areas of elevated activity which exceeded three standard deviations above the mean measurement (i.e.,
+3 Z-Score). Four locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-7and                                                Figure 7-8 below present maps of the +3 Z-Score measurements within Survey Unit 8102 GW                                                                                                                        -3 and biased sampling locations.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -3 Z-Score

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Figure 7 Survey Unit 8102 GW                                                                                                                                                -3 Samples                                     (Locations 19-22)

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For Survey Unit 8102 GW                                                                                                                        -4, count rates ranged between 11,533 cpm and 26,814 cpm, with a mean count rate of 23,072 cpm and a standard deviation of 2,442 cpm. Figure                         7-9below presents a map of the gamma walkover for Survey Unit 8102 GW                                                            -4.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -4 GPS Scan Results

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An evaluation of the Survey Unit 8102 GW                                                            -4 data set was performed to assessthe                                                                                                                                                 small areas of elevated activity which exceeded three standard deviations above the mean measurement (i.e.,
+3 Z-Score). No                        locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-10 below presents a map of the +3 Z-                                                Score measurements within Survey Unit 8102 GW                                                                                                            -4.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -4 Z-Score

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For Survey Unit 8102 GW                                                                                                                        -5, count rates ranged between 18,034 cpm and 27,886 cpm, with a mean count rate of 23,874 cpm and a standard deviation of 735 cpm. Figure 7-11below presents a map of the gamma walkover for Survey Unit 8102 GW                                                            -5.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -5 GPS Scan Results

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An evaluation of the Survey Unit 8102 GW                                                            -5 data set was performed to assessthe                                                                                                                                                 small areas of elevated activity which exceeded three standard deviations above the mean measurement (i.e.,
+3 Z-Score). One                        location was selected for biased sample collection based on evaluation of the gamma walkover data. This                         biased location represented the maximum measurements encountered within the scan area. Figure             7-12and                                                            Figure 7-13 below present maps of the +3 Z-Score measurements within Survey Unit 8102 GW                                                            -5 and biased sampling locations.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -5 Z-Score

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Figure 7 Survey Unit 8102 GW                                                                                                                                                -5 Sample                                     (Location 18)

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For Survey Unit 8102 GW                                                                                                                        -6, count rates ranged between 21,035 cpm and 26,144 cpm, with a mean count rate of 23,171 cpm and a standard deviation of 752 cpm. Figure 7-14below presents a map of the gamma walkover for  Survey Unit 8102 GW                                                            -6.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -6 GPS Scan Results

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An evaluation of the Survey Unit 8102 GW                                                            -6 data set was performed to assessthe                                                                                                                                                 small areas of elevated activity which exceeded three standard deviations above the mean measurement (i.e.,
+3 Z-Score). Three locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-15and                                                                        Figure 7-16 below present maps of the +3 Z-Score measurements within Survey Unit 8102 GW                                                                                                                        -6 and biased sampling locations.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -6 Z-Score

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Figure 7 Survey Unit 8102 GW                                                                                                                                                -6 Samples                                     (Locations 15-17)

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For Survey Unit 8102 GW                                                                                                                        -7, count rates ranged between 14,364 cpm and 26,125 cpm, with a mean count rate of 22,672 cpm and a standard deviation of 1,058 cpm. Figure                         7-17 below presents a map of the gamma walkover for Survey Unit 8102 GW                                    -7.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -7 GPS Scan Results

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An evaluation of the Survey Unit 8102 GW                                                            -7 data set was performed to assessthe                                                                                                                                                 small areas of elevated activity which exceeded three standard deviations above the mean measurement (i.e.,
+3 Z-Score). No                        locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-18 below presents a map of the +3 Z-                                                Score measur ements within Survey Unit 8102 Grid 7.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -7 Z-Score

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For Survey Unit 8102 GW                                                                                                                        -8, count rates ranged between 20,897 cpm and 26,727 cpm, with a mean count rate of 23,654 cpm and a standard deviation of 726 cpm. Figure 7-19below presents a map of the gamma walkover for  Survey Unit 8102 GW                                                            -8.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -8 GPS Scan Results

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An evaluation of the Survey Unit 8102 GW                                                            -8 data set was performed to assessthe                                                                                                                                                 small areas of elevated activity which exceeded three standard deviations above the mean measurement (i.e.,
+3 Z-Score). No                        locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-20 below presents a map of the +3 Z-                                                Score measurements within Survey Unit 8102 GW                                                                                                            -8.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -8 Z-Score

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For Survey Unit 8102 GW                                                                                                                        -9, count rates ranged between 19,951 cpm and 34,103 cpm, with a mean count rate of 24,295 cpm and a standard deviation of 802 cpm. Figure 7-21below presents a map of the gamma walkover for  Survey Unit 8102 GW                                                            -9.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -9 GPS Scan Results

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An evaluation of the Survey Unit 8102 GW                                                            -9 data set was performed to assessthe                                                                                                                                                 small areas of elevated activity which exceeded three standard deviations above the mean measurement (i.e.,
+3 Z-Score). Five                        locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-22and                                                                        Figure 7-23 below present maps of the +3 Z-Score measurements within Survey Unit 8102 GW                                                                                                                        -9 and biased sampling locations.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -9 Z-Score

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Figure 7 Survey Unit 8102 GW                                                                                                                                                -9 Samples                                     (Locations 31-35)

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For Survey Unit 8102 GW                                                                                                                        -10, count rates ranged between 20,753 cpm and 26,281 cpm, with a mean count rate of 23,509 cpm and a standard deviation of 726 cpm. Figure 7-24below presents a map of the gamma walkoverfor                              Survey Unit 8102 GW                                                            -10.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -10 GPS Scan Results

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An evaluation of the Survey Unit 8102 GW                                                            -10 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement (i.e.,
+3 Z-Score). Five                        locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-25and                                                                        Figure 7-26 below present maps of the +3 Z-Score measurements within Survey Unit 8102 GW                                                                                                                        -10 and biased sampling locations.

Figure 7 Survey Unit 8102 GW                                                                                                                                                -10 Z-Score

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Figure 7 Survey Unit 8102 GW                                                                                                                                                -10 Samples                                                             (Locations 26-30)

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For Survey Unit 8102 QC GW-10, count rates ranged between 22,053 cpm and 28,268 cpm, with a mean count rate of 24,860 cpm and a standard deviation of 804 cpm. Figure                         7-27 below presents a map of the gamma walkover evaluation for Survey Unit 8102 QC GW-10.

Figure 7 Survey Unit 8102 QC GW                                                                                                                                               -10 GPS Scan Results

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An evaluation of the Survey Unit 8102 QC GW                                                           -10 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement (i.e., +3 Z-Score). No locations were selected for biased sample collection  due to being a QC scan. Figure 7-28below presents a map of the +3 Z                                                                                    -Score measurements within Survey Unit 8102 QC GW-10.

Figure 7 Survey Unit 8102 QC GW                                                                                                                                               -10 Z-Score

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The on-site laboratory analyzed the 14 soil samples taken for nonparametric statistical testing using the on-site gamma spectroscopy system. A summary of the results for the 14 samples collected for nonparametric statistical testing is provided in   Table 7-2. Gamma spectroscopy results revealed that             Cs-137 was not identified                                                     in any of the random samples. No other ROCs were positively identified. The off-site laboratory, GEL Laboratories, analyzed the 14 random samples for the HTD ROC C-14. C-14 was not detected in any of the 14 random samples.. The maximum operational sum of fractions (OpSOF) for random samples is 0.2133.
The basic statistics for the random sample population, as compared to the BcDCGLs, and the survey unit dose are summarized in Table 7-3.
The SOF or unity rule is the mathematical test used to evaluate compliance with radiological criteria for license termination when more than one radionuclide has been determined to be potentially present. The equation for the unity rule is:

Equation 7 Unity Rule C1                                                                                                                                                                                                                                                                                      +                                                                                                                                                                                                                                                                                                        DCGLC2+............Cn1 DCGL1                            DCGL2                                                                 n Where:                                                               Cn                                                                                                                                                             =                                 concentration of radionuclide n DCGLn                                                          =                                 DCGL of radionuclide n           .

Table 7 Summary of Gamma Spectroscopy Results                                                                         and OpSOF Calculations for Samples Comprising the Statistical Sample Population

Sample ID                                                       ROC                           Activity                                OpDCGL                                    Fraction of                               OpSOF (pCi/g)                                    (pCi/g)                                 OpDCGL

Co-60                                                                     1.22E-01                                                                                                    1.06E+00                                                                                                                                                   1.15E-01 8102X                            FR-GSSX-001                                Cs-137                                                                                 2.35E-01                                                                                                    3.65E+00                                                                                                                                                   6.44E-02 0.17948 Eu-152                                                                           0.00E+00                                                                                                                                       2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                  0.00E+00                                                                                                                                       1.59E+01                                                                                                                                              0.00E+00 Co-60                                                                     1.36E-01                                                                                                    1.06E+00                                                                                                                                                   1.28E-01 Cs-137                                                                                 1.00E-01                                                                                                    3.65E+00                                                                                                                                                   2.74E-02 8102X                            FR-GSSX-002                                Eu-152                                                                           0.00E+00                                                                                                                                       2.36E+00                                                                                                                                              0.00E+00 0.16551

C-14                                                                                                                       1.56E-01                                                                                                    1.59E+01                                                                                                                                                   9.81E-03

8102X                            FR-GSSX-003                                                                                                            Co-60                                                                     1.28E-01                                                                                                    1.06E+00                                                                                                                                                   1.21E-01                                                                           0.15381 Cs-137                                                                                 9.38E-02                                                                                                    3.65E+00                                                                                                                                                   2.57E-02

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Sample ID                                                                                                                        ROC                                                         Activity                                                                          OpDCGL                                                                               Fraction of                                                                          OpSOF (pCi/g)                                                                                (pCi/g)                                                                          OpDCGL

Eu-152                                                                           0.00E+00                                                                                                                                       2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                       1.17E-01                                                                                                    1.59E+01                                                                                                                                                   7.36E-03 Co-60                                                                     3.47E-02                                                                                                    1.06E+00                                                                                                                                                   3.27E-02 8102X                            FR-GSSA-004                                                                                                                  Cs-137                                                                                 6.84E-03                                                                                                    3.65E+00                                                                                                                                                   1.87E-03 0.05643 Eu-152                                                                           0.00E+00                                                                                                                                       2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                       3.47E-01                                                                                                    1.59E+01                                                                                                                                                   2.18E-02 Co-60                                                                     6.28E-02                                                                                                    1.06E+00                                                                                                                                                   5.92E-02 8102X                            FR-GSSX-005                                                                                                                  Cs-137                                                                                 1.62E-01                                                                                                    3.65E+00                                                                                                                                                   4.44E-02 0.12319 Eu-152                                                                           0.00E+00                                                                                                                                       2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                       3.11E-01                                                                                                    1.59E+01                                                                                                                                                   1.96E-02 Co-60                                                                     8.12E-02                                                                                                    1.06E+00                                                                                                                                                   7.66E-02 8102X                            FR-GSSX-006                                                                                                                  Cs-137                                                                                 6.47E-02                                                                                                    3.65E+00                                                                                                                                                   1.77E-02 0.16639 Eu-152                                                                                1.38E-01                                                                                                    2.36E+00                                                                                                                                                   5.85E-02 C-14                                                                                                                       2.16E-01                                                                                                    1.59E+01                                                                                                                                                   1.36E-02 Co-60                                                                     1.15E-01                                                                                                    1.06E+00                                                                                                                                                   1.08E-01 8102X                            FR-GSSX-007                                                                                                                  Cs-137                                                                            0.00E+00                                                                                                                                       3.65E+00                                                                                                                                              0.00E+00 0.21326 Eu-152                                                                                2.06E-01                                                                                                    2.36E+00                                                                                                                                                   8.73E-02 C-14                                                                                                                       2.78E-01                                                                                                    1.59E+01                                                                                                                                                   1.75E-02 Co-60                                                                0.00E+00                                                                                                                                       1.06E+00                                                                                                                                              0.00E+00 8102X                            FR-GSSX-008                                                                                                                  Cs-137                                                                            0.00E+00                                                                                                                                       3.65E+00                                                                                                                                              0.00E+00 0.03264 Eu-152                                                                           0.00E+00                                                                                                                                       2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                       5.19E-01                                                                                                    1.59E+01                                                                                                                                                   3.26E-02 Co-60                                                                0.00E+00                                                                                                                                       1.06E+00                                                                                                                                              0.00E+00 8102X                            FR-GSSX-009                                                                                                                  Cs-137                                                                                 7.84E-03                                                                                                    3.65E+00                                                                                                                                                   2.15E-03 0.01293 Eu-152                                                                                1.49E-02                                                                                                    2.36E+00                                                                                                                                                   6.31E-03 C-14                                                                                                                       7.11E-02                                                                                                    1.59E+01                                                                                                                                                   4.47E-03 Co-60                                                                     4.72E-02                                                                                                    1.06E+00                                                                                                                                                   4.45E-02 Cs-137                                                                                 8.83E-02                                                                                                    3.65E+00                                                                                                                                                   2.42E-02 8102X                            FR-GSSX-010                                                                                                                  Eu-152                                                                           0.00E+00                                                                                                                                       2.36E+00                                                                                                                                              0.00E+00 0.07378

C-14                                                                                                                       8.05E-02                                                                                                    1.59E+01                                                                                                                                                   5.06E-03

8102X                            FR-GSSX-011                                                                                                            Co-60                                                                     1.22E-02                                                                                                    1.06E+00                                                                                                                                                   1.15E-02                                                                           0.06417 Cs-137                                                                                 8.84E-02                                                                                                    3.65E+00                                                                                                                                                   2.42E-02

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Sample ID                                                                        ROC                                  Activity                                           OpDCGL                                                Fraction of                                         OpSOF (pCi/g)                                               (pCi/g)                                            OpDCGL

Eu-152                                                                                3.15E-03                                                                                                    2.36E+00                                                                                                                                                   1.33E-03 C-14                                                                                                                       4.31E-01                                                                                                    1.59E+01                                                                                                                                                   2.71E-02 Co-60                                                                     6.66E-02                                                                                                    1.06E+00                                                                                                                                                   6.28E-02 8102X                            FR-GSSX-012                                                     Cs-137                                                                                 2.77E-02                                                                                                    3.65E+00                                                                                                                                                   7.59E-03 0.10310 Eu-152                                                                                4.76E-02                                                                                                    2.36E+00                                                                                                                                                   2.02E-02 C-14                                                                                                                       1.99E-01                                                                                                    1.59E+01                                                                                                                                                   1.25E-02 Co-60                                                                     3.57E-02                                                                                                    1.06E+00                                                                                                                                                   3.37E-02 8102X                            FR-GSSX-013                                                     Cs-137                                                                                 1.30E-01                                                                                                    3.65E+00                                                                                                                                                   3.56E-02 0.07848 Eu-152                                                                           0.00E+00                                                                                                                                       2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                       1.46E-01                                                                                                    1.59E+01                                                                                                                                                   9.18E-03 Co-60                                                                0.00E+00                                                                                                                                       1.06E+00                                                                                                                                              0.00E+00 8102X                            FR-GSSX-014                                                     Cs-137                                                                                 4.57E-02                                                                                                    3.65E+00                                                                                                                                                   1.25E-02 0.05625 Eu-152                                                                                4.80E-03                                                                                                    2.36E+00                                                                                                                                                   2.03E-03 C-14                                                                                                                       6.63E-01                                                                                                    1.59E+01                                                                                                                                                   4.17E-02 Note: Bold values indicate concentrations greater than MDC.

Table 7 Basic Statistical Properties of                                                                          Random Sample Populationand Survey Unit Dose Avg                                        Avg ROC                                       Mean                                    Median                                            Max                                         Min                                Std. Dev.                                   BcDCGL                                           BcSOF                                          Dose (pCi/g)                                     (pCi/g)                                     (pCi/g)                                     (pCi/g)                                     (pCi/g)                                      (pCi/g)                                            per                                        per ROC                                       ROC Co-60                                6.01E-02                                    5.50E-02                                    1.36E-01                                  0.00E+00                                      4.98E-02                                    3.77E+00                                     1.59E-02                                   3.99E-01 Cs-137                                                                                                                                 7.50E-02                                                                                                7.65E-02                                                                                                2.35E-01                                                                                           0.00E+00                                    6.86E-02                                                                                                 1.31E+01                                  5.73E-03                                                                                           1.43E-01 Eu-152                                                             2.96E-02                                                                                           0.00E+00                                 2.06E-01                                                                                           0.00E+00                                    6.31E-02                                                                                                 8.41E+00                                  3.52E-03                                                                                           8.80E-02 C-14                                                                                                                                                            2.52E-01                                                                                                2.08E-01                                                                                                6.63E-01                                                                                           0.00E+00                                    1.87E-01                                                                                                 5.70E+01                                  4.43E-03                                                                                           1.11E-01 Mean base case sum of fractions (BcSOF) =
0.0296 DOSE ASSIGNED TO SURVEY UNIT =
0.7404 mrem/yr

The on-site laboratory analyzed the 21 judgmental soil samples using the on-site gamma spectroscopy system. A summary of the analytical results for the judgmentalsoil samples is provided in Table 7-4. Gamma spectroscopy results revealed that Cs-137 was positively identified in one judgmental sample.No other ROCs were positively identified                                                                                             GEL Laboratories analyzed

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the 21 judgmental samples for                                                                         the HTD ROC C-14. C-14 was not detected in any of the 21 judgmental samples. The maximum OpSOF for judgmental samples is  0.2154.

Table 7 Summary of Gamma Spectroscopy Results                                                                         and OpSOF Calculations for Judgmental Samples Measured                                     OpDCGL Sample ID                                                      ROC                            Activity                                                                            Fraction of                               OpSOF (pCi/g)                                      (pCi/g)                                 OpDCGL

Co-60                          1.60E-01                                    1.06E+00                                     1.51E-01 8102X                            FJ-GSSX-015                               Cs-137                          1.14E-01                                    3.65E+00                                     3.12E-02                              0.21538 Eu-152                         0.00E+00                                     2.36E+00                                    0.00E+00 C-14                         5.28E-01                                    1.59E+01                                     3.32E-02 Co-60                         0.00E+00                                     1.06E+00                                    0.00E+00 8102X                            FJ-GSSX-016                               Cs-137                                                                                         1.64E-02                                                                                                            3.65E+00                                                                                                                                                  4.49E-03 0.01110 Eu-152                         0.00E+00                                     2.36E+00                                    0.00E+00 C-14                         1.05E-01                                    1.59E+01                                     6.60E-03 Co-60                          5.93E-02                                    1.06E+00                                     5.59E-02 8102X                            FJ-GSSX-017                               Cs-137                          1.11E-01                                    3.65E+00                                     3.04E-02                              0.09585 Eu-152                         0.00E+00                                     2.36E+00                                    0.00E+00 C-14                         1.51E-01                                    1.59E+01                                     9.50E-03 Co-60                          6.73E-02                                    1.06E+00                                     6.35E-02 8102X                            FJ-GSSX-018                               Cs-137                          1.92E-02                                    3.65E+00                                     5.26E-03                              0.09158 Eu-152                                                                                    0.00E+00                                                                                                                                               2.36E+00                                                                                                                                              0.00E+00 C-14                         3.63E-01                                    1.59E+01                                     2.28E-02 Co-60                          2.82E-02                                    1.06E+00                                     2.66E-02 Cs-137                         0.00E+00                                     3.65E+00                                    0.00E+00 Eu-152                          2.33E-01                                    2.36E+00                                     9.87E-02 8102X                            FJ-GSSX-019                                                                                                                                                                                              0.13577

C-14                                                                                                                               1.66E-01                                                                                                            1.59E+01                                                                                                                                                  1.04E-02

Co-60                                                                             5.60E-02                                                                                                            1.06E+00                                                                                                                                                  5.28E-02 8102X                            FJ-GSSX-020                               Cs-137                                                                                        8.93E-02                                                                                                                                                   3.65E+00                                                                                                                                                  2.45E-02 0.08441 Eu-152                                                                                        1.68E-02                                                                                                            2.36E+00                                                                                                                                                  7.12E-03 C-14                                                                                                                           0.00E+00                                                                                                                                               1.59E+01                                                                                                                                              0.00E+00 8102X                            FJ-GSSX-021                                                                                                                                                  Co-60                                                                             1.08E-01                                                                                                            1.06E+00                                                                                                                                                  1.02E-01                                                                           0.12807 Cs-137                                                                                     0.00E+00                                                                                                                                               3.65E+00                                                                                                                                              0.00E+00

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Measured                                                                                     OpDCGL Sample ID                                                                                                                          ROC                                                             Activity                                                                                                                                                                       Fraction of                                                                            OpSOF (pCi/g)                                                                                     (pCi/g)                                                                             OpDCGL

Eu-152                                                                                        6.18E-02                                                                                                            2.36E+00                                                                                                                                                  2.62E-02 C-14                                                                                                                           0.00E+00                                                                                                                                               1.59E+01                                                                                                                                              0.00E+00 Co-60                                                                             1.55E-01                                                                                                            1.06E+00                                                                                                                                                  1.46E-01 8102X                            FJ-GSSX-022                                                                                                                  Cs-137                                                                                         4.64E-02                                                                                                            3.65E+00                                                                                                                                                  1.27E-02 0.17384 Eu-152                                                                                    0.00E+00                                                                                                                                               2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                               2.37E-01                                                                                                            1.59E+01                                                                                                                                                  1.49E-02 Co-60                                                                         0.00E+00                                                                                                                                               1.06E+00                                                                                                                                              0.00E+00 8102X                            FJ-GSSX-023                                                                                                                  Cs-137                                                                                         8.50E-02                                                                                                            3.65E+00                                                                                                                                                  2.33E-02 0.03153 Eu-152                                                                                    0.00E+00                                                                                                                                               2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                               1.31E-01                                                                                                            1.59E+01                                                                                                                                                  8.24E-03 Co-60                                                                         0.00E+00                                                                                                                                               1.06E+00                                                                                                                                              0.00E+00 8102X                            FJ-GSSX-024                                                                                                                  Cs-137                                                                                         1.86E-01                                                                                                            3.65E+00                                                                                                                                                  5.10E-02 0.05096 Eu-152                                                                                    0.00E+00                                                                                                                                               2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                           0.00E+00                                                                                                                                               1.59E+01                                                                                                                                              0.00E+00 Co-60                                                                             6.20E-02                                                                                                            1.06E+00                                                                                                                                                  5.85E-02 8102X                            FJ-GSSX-025                                                                                                                  Cs-137                                                                                     0.00E+00                                                                                                                                               3.65E+00                                                                                                                                              0.00E+00 0.05849 Eu-152                                                                                    0.00E+00                                                                                                                                               2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                           0.00E+00                                                                                                                                               1.59E+01                                                                                                                                              0.00E+00 Co-60                                                                             9.24E-02                                                                                                            1.06E+00                                                                                                                                                  8.72E-02 8102X                            FJ-GSSA-026                                                                                                                  Cs-137                                                                                         1.29E-01                                                                                                            3.65E+00                                                                                                                                                  3.53E-02 0.12251 Eu-152                                                                                    0.00E+00                                                                                                                                               2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                           0.00E+00                                                                                                                                               1.59E+01                                                                                                                                              0.00E+00 Co-60                                                                             5.93E-02                                                                                                            1.06E+00                                                                                                                                                  5.59E-02 Cs-137                                                                                         1.81E-01                                                                                                            3.65E+00                                                                                                                                                  4.96E-02 8102X                            FJ-GSSX-027                                                                                                                  Eu-152                                                                                        3.36E-02                                                                                                            2.36E+00                                                                                                                                                  1.42E-02 0.11977

C-14                                                                                                                           0.00E+00                                                                                                                                               1.59E+01                                                                                                                                              0.00E+00

Co-60                                                                             8.62E-02                                                                                                            1.06E+00                                                                                                                                                  8.13E-02 8102X                            FJ-GSSX-028                                                                                                                  Cs-137                                                                                         9.37E-02                                                                                                            3.65E+00                                                                                                                                                  2.57E-02 0.19128 Eu-152                                                                                        1.78E-01                                                                                                            2.36E+00                                                                                                                                                  7.54E-02 C-14                                                                                                                               1.41E-01                                                                                                            1.59E+01                                                                                                                                                  8.87E-03 8102X                            FJ-GSSX-029                                                                                                                                                  Co-60                                                                             1.03E-01                                                                                                            1.06E+00                                                                                                                                                  9.72E-02                                                                           0.12345 Cs-137                                                                                         6.08E-02                                                                                                            3.65E+00                                                                                                                                                  1.67E-02

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Measured                                                                 OpDCGL Sample ID                                                                                              ROC                                                Activity                                                                                                                                 Fraction of                                                         OpSOF (pCi/g)                                                                 (pCi/g)                                                           OpDCGL

Eu-152                                                                                    0.00E+00                                                                                                                                               2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                               1.53E-01                                                                                                            1.59E+01                                                                                                                                                  9.62E-03 Co-60                                                                             4.50E-02                                                                                                            1.06E+00                                                                                                                                                  4.25E-02 8102X                            FJ-GSSX-030                                                                                Cs-137                                                                                         5.15E-02                                                                                                            3.65E+00                                                                                                                                                  1.41E-02 0.05656 Eu-152                                                                                    0.00E+00                                                                                                                                               2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                           0.00E+00                                                                                                                                               1.59E+01                                                                                                                                              0.00E+00 Co-60                                                                             2.03E-02                                                                                                            1.06E+00                                                                                                                                                  1.92E-02 8102X                            FJ-GSSX-031                                                                                Cs-137                                                                                         1.30E-01                                                                                                            3.65E+00                                                                                                                                                  3.56E-02 0.14359 Eu-152                                                                                        1.89E-01                                                                                                            2.36E+00                                                                                                                                                  8.01E-02 C-14                                                                                                                               1.39E-01                                                                                                            1.59E+01                                                                                                                                                  8.74E-03 Co-60                                                                             9.37E-04                                                                                                            1.06E+00                                                                                                                                                  8.84E-04 8102X                            FJ-GSSX-032                                                                                Cs-137                                                                                         7.40E-03                                                                                                            3.65E+00                                                                                                                                                  2.03E-03 0.01002 Eu-152                                                                                    0.00E+00                                                                                                                                               2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                               1.13E-01                                                                                                            1.59E+01                                                                                                                                                  7.11E-03 Co-60                                                                             8.08E-02                                                                                                            1.06E+00                                                                                                                                                  7.62E-02 8102X                            FJ-GSSX-033                                                                                Cs-137                                                                                         5.38E-02                                                                                                            3.65E+00                                                                                                                                                  1.47E-02 0.09914 Eu-152                                                                                    0.00E+00                                                                                                                                               2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                               1.30E-01                                                                                                            1.59E+01                                                                                                                                                  8.18E-03 Co-60                                                                             8.95E-02                                                                                                            1.06E+00                                                                                                                                                  8.44E-02 8102X                            FJ-GSSX-034                                                                                Cs-137                                                                                         7.40E-02                                                                                                            3.65E+00                                                                                                                                                  2.03E-02 0.10624 Eu-152                                                                                    0.00E+00                                                                                                                                               2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                               2.43E-02                                                                                                            1.59E+01                                                                                                                                                  1.53E-03 Co-60                                                                             6.90E-02                                                                                                            1.06E+00                                                                                                                                                  6.51E-02 8102X                            FJ-GSSX-035                                                                                Cs-137                                                                                         7.59E-02                                                                                                            3.65E+00                                                                                                                                                  2.08E-02 0.09369 Eu-152                                                                                    0.00E+00                                                                                                                                               2.36E+00                                                                                                                                              0.00E+00 C-14                                                                                                                               1.24E-01                                                                                                            1.59E+01                                                                                                                                                  7.80E-03 Note: Bold values indicate concentrations greater than MDC.

The implementation of survey specific QC measures included the collection of four             sample           s (8102X-3-FQ-GSSX-007, 8102X-3-FR-GSSB-004, 8102X-3-FQ-GSSX-031, and 8102X-3-FJ-GSSB-026) for split             and/or                                                 duplicate sample analysis. The on-site laboratory analyzed the QC samples using the on-                     site gamma spectroscopy system. A summary of the analytical results for the QC samples is provided in Table                                                          7-5. Gamma spectroscopy results revealed that Cs-137 was

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not identified in             any of the QC samples. No other ROCs were positively identified in any QC sample. The maximum OpSOF                                              for QC samples is             0.1661.

Table 7 Summary of Gamma Spectroscopy Results                                                                         and OpSOF Calculations for QC Samples

Activity                                     OpDCGL                                         Fraction Sample ID                                                   ROC                               (pCi/g)                                         (pCi/g)                                               of                          OpSOF OpDCGL

Co-60                            9.35E-02                                                                                                            1.06E+00                                                                                                                                               0.08821 8102X                            FR-GSSB-                            Cs-137                            2.15E-01                                                                                                            3.65E+00                                                                                                                                               0.05890 004                                            Eu-152                            0.00E+00                                                                                                                                               2.36E+00                                                                                                                                               0.00000  0.14711

C-14                          0.00E+00                                                                                                                                               1.59E+01                                                                                                                                               0.00000 Co-60                            7.84E-02                                                                                                            1.06E+00                                                                                                                                               0.07396 8102X                            FQ-GSSX-                            Cs-137                           0.00E+00                                                                                                                                               3.65E+00                                                                                                                                               0.00000 007                                            Eu-152                            0.00E+00                                                                                                                                               2.36E+00                                                                                                                                               0.00000  0.07396

C-14                          0.00E+00                                                                                                                                               1.59E+01                                                                                                                                               0.00000 Co-60                            1.53E-01                                                                                                            1.06E+00                                                                                                                                               0.14434 8102X                            FJ-GSSB-                           Cs-137                            7.95E-02                                                                                                            3.65E+00                                                                                                                                               0.02178 026                                            Eu-152                            0.00E+00                                                                                                                                               2.36E+00                                                                                                                                               0.00000  0.16612

C-14                          0.00E+00                                                                                                                                               1.59E+01                                                                                                                                               0.00000 Co-60                            5.51E-02                                                                                                            1.06E+00                                                                                                                                               0.05198 8102X                            FQ-GSSX-                            Cs-137                            4.17E-02                                                                                                            3.65E+00                                                                                                                                               0.01142 031                                            Eu-152                             8.60E-02                                                                                                            2.36E+00                                                                                                                                               0.03644  0.09985

C-14                          0.00E+00                                                                                                                                               1.59E+01                                                                                                                                               0.00000 Note: Bold values indicate concentrations greater than MDC.
: 8.                                                          QUALITY CONTROL

The on-site laboratory processed four            split and duplicate sample            s (8102X-3-FQ-GSSX-007, 8102X-3-FR-GSSB-004, 8102X-3-FQ-GSSX-031, and 8102X-3-FR-GSSB-026)                                                                         using gamma spectroscopy analysis. The data was evaluated using  acceptance criteria specified in             NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual (Reference             13) as detailed by Section 5.6.3.2 of the LTP. No assessmentswere                                required since Cs-                                                        137 was not detected in either the standard or comparison samples in all cases. Refer to Attachment                                                                                                                                4 for data and QCanalysis results.

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: 9.                                                          INVESTIGATIONS AND RESULTS

During the FSS of Survey Unit 8102, areaswith                                                                                                                                                                                                              +3 sigma/alarms were investigated. Twenty-one judgmental samples were collected for investigation, all with radiological concentrations below the OpDCGL           .
: 10.                              REMEDIATION AND RESULTS

No radiological remedial action as described by MARSSIM Section 5.4 was performed in  Survey Unit 8102 prior to or as a result of the FSS. Chapter 4 of the LTP                                                                                                                           determined that remediation beyond that required to meet the release criteria is unnecessary and the remaining residual radioactivity in soil was ALARA.
: 11.                              CHANGES FROM THE FINAL STATUS SURVEY PLAN

There were no addendums to the FSS plan.
: 12.                              DATA QUALITY ASSESSMENT

The DQO sample design and data were reviewed in accordance with  FCSD-RA-                                                                  LT-304,                                                           Final Status Survey Data Assessment (Reference 14) for completeness and consistency.
Documentation was complete and legible. Surveys and the collection of samples            were consistent with the DQOs and were sufficient to ensure that the survey unit was properly designated as Class
: 3. The survey design had adequate power as indicated by the retrospective power                        curve (see , Figure 16-7).
The measurement results indicated that all sampleswere less than a SOF of                                                     1 when compared to the OpDCGLs.
Although MARSSIM states that the Sign Test need not be performed in the instance that no measurements surpass the OpDCGL, the test was conducted to demonstrate adherence to the statistical principles of the DQO process. The Sign Test was performed on the data and compared to the original assumptions of the DQOs. The evaluation of the Sign Test results clearly demonstrates that the  Survey Unit 8102 passes the unrestricted release criteria, thus, the null hypothesis is rejected. The results of the Sign Test are presented in Attachment 3.
The preliminary data review consisted of calculating basic statistical quantities (e.g., mean, median, standard deviation). All data was considered valid including negative values, zeros, and values reported below the MDC. The mean and median values for each ROC were well below the respective OpDCGLs. Also, the retrospective power curve shows that a sufficient number of

[56]
FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

samples were collected to achieve the desired power ; therefore, the Survey Unit 8102 meets the unrestricted release criteria with adequate power as required by the DQOs.
The means of all identified isotopes are less than the Consultation Triggers for Residential Soil Concentration depicted in Table H.1 of NUREG 1757, Vol.1, Rev. 2 (Memorandum of Understanding Table 1). The full table is included in Attachment 5 of this release record.
The data for Cs-137 is                                                                                     presented graphically through a                                                                                     frequency plot and quantile plot. All graphical presentations are provided in Attachment                                     6.
: 13.                              ANOMALIES

No anomalies were observed during the performance or analyses of the survey.
: 14.                              CONCLUSION

Survey Unit 8102has met the DQOs of the FSS plan. The ALARA criteria as specified in Chapter 4 of the LTP were achieved. The elevated measurement comparison for soils was not applicable and remediation was not required.
All identified ROC were used for statistical testing to determine the adequacy of the survey unit for FSS. Evaluation of the data shows that none of the random ROC concentration values exceeds the OpDCGLs; therefore, in accordance with LTP Section 5 .2.6, the survey unit meets the release criteria.
The sample data passed the Sign Test. The null hypothesis was rejected. The  retrospective power curve showed that adequate power was achieved. The survey unit is properly classified as Class              3.
The dose contribution from soil in Survey Unit 8102 is                                                                                     0.7404 mrem/yr TEDE, based on the average concentration of the ROC in samples used for nonparametric                       statisticaltesting                         .
Survey Unit 8102is acceptable                                                                                                                                  for unrestricted release.
: 15.                              REFERENCES
: 1.                                                                                                                                   FCSD-RA-LT-305, Final Status Survey Data Reporting
: 2.                                                                                                                                   Fort Calhoun Station Decommissioning Project License Termination Plan
: 3.                                                                                                                                   FCSD-RA-LT-302, Final Status Survey Sample Plan Development
: 4.                                                                                                                                   NUREG-1575, Revision 1,                                   Multi-Agency Radiation Survey and Site Investigation Manual
: 5.                                                                                                                                   TSD 20-001, Historical Site Assessment for Fort Calhoun Station 

[57]
FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA
: 6.                                                                                                                                   TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan
: 7.                                                                                                                                   NUREG-1757, Volume 2, Revision 2,                                    Consolidated Decommissioning Guidance -
Characterization, Survey, and Determination of Radiological Criteria
: 8.                                                                                                                                   FCSD-RA-LT-100,                                                           Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station
: 9.                                                                                                                                   FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors
: 10.                                                                                                                                   FCSD-RA-LT-205,                                                           Chain-of-Custody Protocol for Site Characterization and Final Status Survey
: 11.                                                                                                                                   FCSD-RA-LT-203,                                                           Sample Media Collection for Site Characterization and Final Status Survey
: 12.                                                                                                                                   FCSD-RA-LT-204,                                                           Sample Media Preparation for Site Characterization and Final Status Survey
: 13.                                                                                                                                   NUREG-1576,                                   Multi-Agency Radiological Laboratory Analytical Protocols Manual
: 14.                                                                                                                                   FCSD-RA-LT-304,                                                           Final Status Survey Data Assessment
: 16.                              ATTACHMENTS

Attachment 1 - Figures Attachment 2 - Scan Data Attachment 3 - Sign Test Attachment 4 - Quality Control Assessment Attachment 5 - Consultation Triggers for Residential Soil                                                                          Concentrations Attachment 6 - Graphical Presentations

[58]
FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

ATTACHMENT 1 - FIGURES

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

Figure 16 Survey Unit 8102 Scan and Sampling Location Map

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

Figure 16 Survey Unit 8102 Random Sample Locations Map

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

Figure 16 Survey Unit 8102 Judgmental Sample Locations Map Sample 015 to 025

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

Figure 16 Survey Unit 8102 Judgmental Sample Locations Map Sample 026 to 035

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ATTACHMENT 2 - SCAN DATA

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Table 16 Survey Unit                                                                        8102 Complete Scan Data

Min                                                                             Max Scan Detector                                                                                                           Detector                                                                                                                                                                                                                             Survey                                                                                                                                                                                                             Scan                                                                                          Logged                                                                                                                                  Avg                                                                                                      Action                                                                                                        Scan Type                                                                                                                          ID                                                                                 M3001 ID                                                                                                                           Unit                                                                              Location                                                                                                   Logged                                                                                                        Result                                                                                        Background                                                                                                                                         Level                                                                                   Alarms?
Result                                                                                                      (cpm)                                                                                                                    (cpm)                                                                                                               (cpm)                                                                                                  (Y/N)
(cpm) 44-20                                                                                           PR397204                                                                                                              25021208                                                                                                 8102                                                                                                                                                                                                    1                                                                                                                               10886                                                                                                                    27300                                                                                                                                                 24280                                                                                                                                         25640                                                                                                                                                Y 44-20                                                                                           PR397204                                                                                                              25021208                                                                                                 8102                                                                                                                                                                                                    2                                                                                                                               10886                                                                                                                    26100                                                                                                                                                 24280                                                                                                                                         25640                                                                                                                                                Y 44-20                                                                                           PR397204                                                                                                              25021208                                                                                                 8102                                                                                                                                                                                                    3                                                                                                                               10886                                                                                                                    24200                                                                                                                                                 24280                                                                                                                                         25640                                                                                                                                                N 44-20                                                                                           PR397204                                                                                                              25021208                                                                                                 8102                                                                                                                                                                                                    4                                                                                                                               10886                                                                                                                    24300                                                                                                                                                 24280                                                                                                                                         25640                                                                                                                                                N 44-20                                                                                           PR397204                                                                                                              25021208                                                                                                 8102                                                                                                                                                                                                    5                                                                                                                               10886                                                                                                                    26500                                                                                                                                                 24280                                                                                                                                         25640                                                                                                                                                Y 44-20                                                                                           PR397204                                                                                                              25021208                                                                                                 8102                                                                                                                                                                                                    6                                                                                                                               10886                                                                                                                    22400                                                                                                                                                 24280                                                                                                                                         25640                                                                                                                                                N 44-20                                                                                           PR397204                                                                                                              25021208                                                                                                 8102                                                                                                                                                                                                    7                                                                                                                               10886                                                                                                                    22500                                                                                                                                                 24280                                                                                                                                         25640                                                                                                                                                N 44-20                                                                                           PR397204                                                                                                              25021208                                                                                                 8102                                                                                                                                                                                                    8                                                                                                                               10886                                                                                                                    26400                                                                                                                                                 24280                                                                                                                                         25640                                                                                                                                                Y 44-20                                                                                           PR397204                                                                                                              25021208                                                                                                 8102                                                                                                                                                                                                    9                                                                                                                               10886                                                                                                                    22700                                                                                                                                                 24280                                                                                                                                         25640                                                                                                                                                N 44-20                                                                                           PR397204                                                                                                              25021208                                                                                                 8102                                                                                                                                                                                          10                                                                                                                     10886                                                                                                                    23300                                                                                                                                                 24280                                                                                                                                         25640                                                                                                                                                N 44-20                                                                                           PR397204                                                                                                              25021208                                                                                                 8102                                                                                                                                                                                          11                                                                                                                     10886                                                                                                                    26100                                                                                                                                                 24280                                                                                                                                         25640                                                                                                                                                Y 44-20                                                                                           PR397204                                                                                                              25021208                                                                                                 8102                                                                                                                                                                                          12                                                                                                                     10886                                                                                                                    23100                                                                                                                                                 24280                                                                                                                                         25640                                                                                                                                                N 44-20                                                                                           PR397204                                                                                                              25021208                                                                                                 8102                                                                                                                                                                                          13                                                                                                                     10886                                                                                                                    26500                                                                                                                                                 24280                                                                                                                                         25640                                                                                                                                                Y 44-20                                                                                           PR397204                                                                                                              25021208                                                                                                 8102                                                                                                                                                                                          14                                                                                                                     10886                                                                                                                    24900                                                                                                                                                 24280                                                                                                                                         25640                                                                                                                                                N 44-20                                                                                           PR397732                                                                                                              25021209                                                                                                 8102                                                                                                                                                                                          15                                                                                                                                                                                                                                                                                                                26900                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR397732                                                                                                              25021209                                                                                                 8102                                                                                                                                                                                          16                                                                                                                                                                                                                                                                                                                26600                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR397732                                                                                                              25021209                                                                                                 8102                                                                                                                                                                                          17                                                                                                                                                                                                                                                                                                                26100                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR397732                                                                                                              25021209                                                                                                 8102                                                                                                                                                                                          18                                                                                                                                                                                                                                                                                                                27000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR397732                                                                                                              25021209                                                                                                 8102                                                                                                                                                                                          19                                                                                                                                                                                                                                                                                                                27200                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR397732                                                                                                              25021209                                                                                                 8102                                                                                                                                                                                          20                                                                                                                                                                                                                                                                                                                25900                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR397732                                                                                                              25021209                                                                                                 8102                                                                                                                                                                                          21                                                                                                                                                                                                                                                                                                                27000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR397732                                                                                                              25021209                                                                                                 8102                                                                                                                                                                                          22                                                                                                                                                                                                                                                                                                                27800                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR397732                                                                                                              25021209                                                                                                 8102                                                                                                                                                                                          23                                                                                                                                                                                                                                                                                                                26500                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR397732                                                                                                              25021209                                                                                                 8102                                                                                                                                                                                          24                                                                                                                                                                                                                                                                                                                26300                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR397732                                                                                                              25021209                                                                                                 8102                                                                                                                                                                                          25                                                                                                                                                                                                                                                                                                                25300                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR404738                                                                                                              25021210                                                                                                 8102                                                                                                                                                                                          26                                                                                                                                                                                                                                                                                                                26400                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR404738                                                                                                              25021210                                                                                                 8102                                                                                                                                                                                          27                                                                                                                                                                                                                                                                                                                27100                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR404738                                                                                                              25021210                                                                                                 8102                                                                                                                                                                                          28                                                                                                                                                                                                                                                                                                                28200                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR404738                                                                                                              25021210                                                                                                 8102                                                                                                                                                                                          29                                                                                                                                                                                                                                                                                                                27200                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR404738                                                                                                              25021210                                                                                                 8102                                                                                                                                                                                          30                                                                                                                                                                                                                                                                                                                26700                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                                           PR404738                                                                                                              25021210                                                                                                 8102                                                                                                                                                                                          31                                                                                                                                                                                                                                                                                                                26700                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

Min                                                             Max Scan Detector                                                                                     Detector                                                                                                                                                                               Survey                                                                                                                                                                   Scan                                                                       Logged                                                                                                      Avg                                                                                 Action                                                                                  Scan Type                                                                                                 ID                                                                M3001 ID                                                                                                 Unit                                                             Location                                                                              Logged                                                                                  Result                                                                     Background                                                                                                           Level                                                                  Alarms?
Result                                                                                 (cpm)                                                                                           (cpm)                                                                                        (cpm)                                                                             (Y/N)
(cpm) 44-20                                                                        PR404738                                                                                      25021210                                                                                                 8102                                                                                                                                                                                          32                                                                                                                                                                                                                                                                                                                27100                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                        PR404738                                                                                      25021210                                                                                                 8102                                                                                                                                                                                          33                                                                                                                                                                                                                                                                                                                26900                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                        PR404738                                                                                      25021210                                                                                                 8102                                                                                                                                                                                          34                                                                                                                                                                                                                                                                                                                26600                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                        PR404738                                                                                      25021210                                                                                                 8102                                                                                                                                                                                          35                                                                                                                                                                                                                                                                                                                27100                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Y 44-20                                                                        PR397204                                                                                      25021208                                                                                                 8102                                                                                                                                                             GW 1                                                                                        19227                                                                                                                    25871                                                                                                                                                 22700                                                                                                                                         24015                                                                                                                                                Y 44-20                                                                        PR397204                                                                                      25021208                                                                                                 8102                                                                                                                                                   GW 10                                                                              20753                                                                                                                    26281                                                                                                                                                 23560                                                                                                                                         24900                                                                                                                                                Y 44-20                                                                        PR397732                                                                                      25021209                                                                                                 8102                                                                                                                                                             GW 2                                                                                        12136                                                                                                                    26543                                                                                                                                                 23440                                                                                                                                         24776                                                                                                                                                Y 44-20                                                                        PR404738                                                                                      25021210                                                                                                 8102                                                                                                                                                             GW 3                                                                                        21649                                                                                                                    27921                                                                                                                                                 24000                                                                                                                                         25352                                                                                                                                                Y 44-20                                                                        PR397732                                                                                      25021209                                                                                                 8102                                                                                                                                                             GW 4                                                                                        11533                                                                                                                    26814                                                                                                                                                 23320                                                                                                                                         24653                                                                                                                                                Y 44-20                                                                        PR404738                                                                                      25021210                                                                                                 8102                                                                                                                                                             GW 5                                                                                        18034                                                                                                                    27886                                                                                                                                                 23740                                                                                                                                         25085                                                                                                                                                Y 44-20                                                                        PR397204                                                                                      25021208                                                                                                 8102                                                                                                                                                             GW 6                                                                                        21035                                                                                                                    26144                                                                                                                                                 22920                                                                                                                                         24241                                                                                                                                                Y 44-20                                                                        PR397732                                                                                      25021209                                                                                                 8102                                                                                                                                                             GW 7                                                                                        14346                                                                                                                    26125                                                                                                                                                 22460                                                                                                                                         23768                                                                                                                                                Y 44-20                                                                        PR404738                                                                                      25021210                                                                                                 8102                                                                                                                                                             GW 8                                                                                        20897                                                                                                                    26727                                                                                                                                                 23700                                                                                                                                         25044                                                                                                                                                Y 44-20                                                                        PR397732                                                                                      25021209                                                                                                 8102                                                                                                                                                             GW 9                                                                                        19951                                                                                                                    34103                                                                                                                                                 24040                                                                                                                                         25393                                                                                                                                                Y 44-20                                                                                                                                                                      25021210                                                                                                 8102                                                               QC GW                                                                                  22053                                                                                                                    28268                                                                                                                                                 24400                                                                                                                                         25763                                                                                                                                                Y PR404738                                                                                                                                                                                                                                                                                     10 Areas above 3 standard deviations were scanned for verification of original scans prior to judgmental sample collection

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

ATTACHMENT 3 - SIGN TEST

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

Table 16 Survey Unit                                                                        8102 Sign Test
                                    #             SOF           1-Ws            Sign (Ws) 1          0.17948           0.82            +1 2          0.16551           0.83            +1 3          0.15381           0.85            +1 4          0.05643           0.94            +1 5          0.12319           0.88            +1 6          0.16639           0.83            +1 7          0.21326           0.79            +1 8          0.03264           0.97            +1 9          0.01293           0.99            +1 10         0.07378           0.93            +1 11         0.06417           0.94            +1 12         0.10310           0.90            +1 13         0.07848           0.92            +1 14         0.05625           0.94            +1 Number of positive differences (S+)                           14

Critical Value           10

Survey Unit                 Meets the Acceptance Criteria

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

ATTACHMENT 4 - QUALITY CONTROL ASSESSMENT

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

Table 16 Survey Unit                                                                        8102 QC Assessment

Duplicate Sample Assessment F orm
�6�X�U�Y�H�\\��$�U�H�D���     � � � �   �6�X�U�Y�H�\\��8�Q�L�W��� � � � �6�X�U�Y�H�\\��8�Q�L�W��1�D�P�H�                                                             �1�R�U�W�K��2�Z�Q�H�U��&�R�Q�W�U�R�O�O�H�G��$�U�H�D

6MPSOH 3 OMQ 

6MPSOH GHVFULSWLRQ

6WMQGMUG ,G         $FWLYLW\\ 9MOXH 6WMQGMUG (UURU$FWLYLW\\ 9MOXH     6WMQGMUG               $EVROXWH    53'         7 U  H QG L  QJ Acceptable?
                             6WMQGMUG                    &RPSMULVRQ      (UURU                'LIIHUHQFH              $VVHVVPHQW"

Guidance from Section C.4.2.2 of MARLAP

UBGR (Cs-137 OpDCGL) = 3.65 pCi/g LBGR (Mean Cs-137Activity) = 0.075 pCi/g Width of the Gray Region () = 3.575 pCi/g Max Standard Uncertainty (&#xb5;MR) = /10 = 0.3575 pCi/g
&RPPHQWV &RUUHFWLYH$FWLRQV $VSHUWKH4$33 QRDVVHVVPHQWZDVSHUIRUPHGEHFDXVHQHLWKHUWKHVWDQGDUGRUWKHFRPSDULVRQLGHQWLILHG&V     Max Relative Standard Uncertainty (MR) = 0.0979 1RIXUWKHUDFWLRQLVQFHVVDU\\                                                              Average Concentration of the two measured results < UBGR:
Warn in g  Limit  =  2.83  &#xb5;MR  =  1.0117  p Ci/g Co n tro l  Limit  =  4.24  &#xb5;MR  =  1.5158  p Ci/g Average Concentration of the two measured results > UBGR:
Warn in g  Limit  =  2.83  MR  x  100%  =  27.72%
Co n tro l  Limit  =  4.24  MR  x  100%  =  41.53%

3HUIRUPHGE\\                0LWFKHOO8]                     'DWH                                                           5HYLHZHGE\\                  Date:

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

ATTACHMENT 5 - CONSULTATION TRIGGERS FOR RESIDENTIAL SOIL CONCENTRATION

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

ATTACHMENT 6 - GRAPHICAL PRESENTATIONS

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

Figure 16 Quantile Plot for Cs                                                -137 Concentration

Quantile Plot For Cs                                                                                                                                   -137

2.50E-01

2.00E-01

1.50E-01

1.00E-01

5.00E-02

0.00E+00 0%                                                                                              10%                                                                                    20%                                                                                    30%                                                                                    40%                                                                                    50%                                                                                    60%                                                                                    70%                                                                                    80%                                                                                    90%                                                                          100%

PERCENTAGE

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

Figure 16 Histogram for Cs                                                -137 Concentration

Frequency Plot For Cs                                                                                                                                           -137

10 9
8 7
6 5
4 3
2 1
0 3.92E-02                                                                                                                                                7.83E-02                                                                                                                                                1.18E-01                                                                                                                                                1.57E-01                                                                                                                                                1.96E-01                                                                                                                                                2.45E-01

UPPER END VALUE (PCI/G)

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8102 NORTH OWNER CONTROLLED AREA

Figure 16 Retrospective Power Curve for Survey Unit 8102

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8103 NORTH OWNER CONTROLLED AREA

FORT CALHOUN STATION FINAL STATUS SURVEY RELEASE RECORD

SURVEY UNIT 8103 NORTH OWNER CONTROLLED AREA REVISION 0

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8103 NORTH OWNER CONTROLLED AREA

PREPARED BY / DATE:
M. Bryant, LT/FSS Specialist

REVIEWED BY / DATE:
M. Uz, LT/FSS Specialist

REVIEWED BY /    DATE:
A. Barker Regulatory Assurance & Emergency Planning Manager

REVIEWED BY / DATE:
D. Whisler Manager Radiation Protection & Chemistry

APPROVED BY / DATE:
B. Bishop, LT/FSS Manager

[2]

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8103 NORTH OWNER CONTROLLED AREA

TABLE OF CONTENTS
: 1. EXECUTIVE 

==SUMMARY==
 .............................................................................................................................. 8
: 2. SURVEY UNIT DESCRIPTION .................................................................................................................... 8
: 3. CLASSIFICATION BASIS .............................................................................................................................. 9
: 4. DATA QUALITY OBJECTIVES ................................................................................................................. 11
: 5. SURVEY DESIGN .......................................................................................................................................... 14
: 6. SURVEY IMPLEMENTATION ................................................................................................................... 18
: 7. SURVEY RESULTS ....................................................................................................................................... 19
: 8. QUALITY CONTROL ................................................................................................................................... 60
: 9. INVESTIGATIONS AND RESULTS ........................................................................................................... 60
: 10. REMEDIATION AND RESULTS ................................................................................................................ 60
: 11. CHANGES FROM THE FINAL STATUS SURVEY PLAN ..................................................................... 60
: 12. DATA QUALITY ASSESSMENT ................................................................................................................ 61
: 13. ANOMALIES .................................................................................................................................................. 61
: 14. CONCLUSION ............................................................................................................................................... 62
: 15. REFERENCES ................................................................................................................................................ 62
: 16. ATTACHMENTS ........................................................................................................................................... 63

[3]
FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8103 NORTH OWNER CONTROLLED AREA

LIST OF TABLES

Table 3 Statistical Quantities for Cs-137 and Co-60 from the Characterization Survey of 8103 ................. 9 Table 3 Off-Site Analysis for Characterization Samples in 8103 .................................................................. 10 Table 4 Base Case DCGLs for Soil .................................................................................................................. 13 Table 4 Operational DCGLs for Soil ............................................................................................................... 13 Table 5 Action Levels for Survey Unit 8103 .................................................................................................... 14 Table 5 Random Sample Locations ................................................................................................................. 15 Table 5 Judgmental Sample or Measurement Locations ............................................................................... 16 Table 5 Investigation Levels ............................................................................................................................. 17 Table 5 Synopsis of Survey Design ................................................................................................................... 18 Table 7 Synopsis of Scan Results ..................................................................................................................... 20 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Random Samples ....... 54 Table 7 Basic Statistical Properties of Random Sample Population and Survey Unit Dose ....................... 55 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples/Measurements .................................................................................................................................. 56 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples ............... 59 Table 16 Survey Unit 8103 Complete Scan Data ............................................................................................ 68 Table 16 Survey Unit 8103 Sign Test ............................................................................................................... 70 Table 16 Survey Unit 8103 QC Assessment .................................................................................................... 72

LIST OF FIGURES

Figure 7 Survey Unit 8103 Grid 1 GPS Scan Results ..................................................................................... 21 Figure 7 Survey Unit 8103 Grid 1 Z-Score and ISOCS Measurement Map ................................................ 22 Figure 7 Survey Unit 8103 Grid 2 GPS Scan Results ..................................................................................... 23 Figure 7 Survey Unit 8103 Grid 2 Z-Score and ISOCS Measurement Map ................................................ 24 Figure 7 Survey Unit 8103 Grid 3 GPS Scan Results ..................................................................................... 25 Figure 7 Survey Unit 8103 Grid 3 Z-Score and ISOCS Measurement Map ................................................ 26 Figure 7 Survey Unit 8103 Grid 4 GPS Scan Results ..................................................................................... 27 Figure 7 Survey Unit 8103 Grid 4 Z-Score Map ............................................................................................. 28 Figure 7 Survey Unit 8103 Grid 5 GPS Scan Results ..................................................................................... 29 Figure 7 Survey Unit 8103 Grid 5 Z-Score Map ........................................................................................... 30 Figure 7 Survey Unit 8103 Grid 6 GPS Scan Results ................................................................................... 31 Figure 7 Survey Unit 8103 Grid 6 Z-Score and ISOCS Measurement Map .............................................. 32 Figure 7 Survey Unit 8103 Grid 7 GPS Scan Results ................................................................................... 33 Figure 7 Survey Unit 8103 Grid 7 Z-Score Map ........................................................................................... 34 Figure 7 Survey Unit 8103 Grid 8 GPS Scan Results ................................................................................... 35 Figure 7 Survey Unit 8103 Grid 8 Z-Score Map ........................................................................................... 36 Figure 7 Survey Unit 8103 Grid 9 GPS Scan Results ................................................................................... 37 Figure 7 Survey Unit 8103 Grid 9 Z-Score and ISOCS Measurement Map .............................................. 38 Figure 7 Survey Unit 8103 Grid 10 GPS Scan Results ................................................................................. 39 Figure 7 Survey Unit 8103 Grid 10 Z-Score and ISOCS Measurement Map ............................................ 40 Figure 7 Survey Unit 8103 Grid 11 GPS Scan Results ................................................................................. 41 Figure 7 Survey Unit 8103 Grid 11 Z-Score Map ......................................................................................... 42

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Figure 7 Survey Unit 8103 Grid 12 GPS Scan Results ................................................................................. 43 Figure 7 Survey Unit 8103 Grid 12 Z-Score Map ......................................................................................... 44 Figure 7 Survey Unit 8103 Grid 13 GPS Scan Results ................................................................................. 45 Figure 7 Survey Unit 8103 Grid 13 Z-Score Map ......................................................................................... 46 Figure 7 Survey Unit 8103 Grid 14 GPS Scan Results ................................................................................. 47 Figure 7 Survey Unit 8103 Grid 14 Z-Score Map ......................................................................................... 48 Figure 7 Survey Unit 8103 Grid 14QC GPS Scan Results ........................................................................... 49 Figure 7 Survey Unit 8103 Grid 14QC Z-Score Map ................................................................................... 50 Figure 7 Survey Unit 8103 Grid 15 GPS Scan Results ................................................................................. 51 Figure 7 Survey Unit 8103 Grid 15 Z-Score Map ......................................................................................... 52 Figure 16 Survey Unit 8103 Random Scan and Sample Locations Map                         ...................................................... 65 Figure 16 Survey Unit 8103 Judgmental Sample Locations Map                      ................................................................. 66 Figure 16 Quantile Plot for Cs-137 Concentration ......................................................................................... 76 Figure 16 Histogram for Cs-137 Concentration ............................................................................................. 77 Figure 16 Retrospective Power Curve for Survey Unit 8103                   ......................................................................... 78

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LIST OF ABBREVIATIONS delta
/          relative shift sigma ALARA        as low as is reasonably achievable BcDCGL       base case derived concentration guideline level BcSOF        base case sum of fractions cpm          counts per minute DQA          data quality assessment DQO          data quality objective DCGL         derived concentration guideline level DCGLW        derived concentration guideline level wide area FCS          Fort Calhoun Station FSS          final status survey GPS          Global Positioning System HTD          hard-to-detect IC           insignificant contributor ISOCS        In Situ Object Counting System LBGR         lower bound of the gray region LT/FSS       License Termination/Final Status Survey LTP          license termination plan m            meter MARSSIM      Multi-Agency Radiation Survey and Site Investigation Manual MDC          minimum detectable concentration mrem/yr      millirem per year NaI          sodium iodide NRC          Nuclear Regulatory Commission pCi/g        picocuries per gram

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QAPP         quality assurance project plan QC           quality control ROC          radionuclide of concern SOF          sum of fractions TEDE         total effective dose equivalent TSD          technical support document UBGR         upper bound of the gray region VSP          Visual Sample Plan

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: 1. EXECUTIVE 

==SUMMARY==

This final status survey (FSS) release record for Survey Unit 8103, North Owner Controlled Area, has been generated in accordance with procedure FCSD-RA-LT-305, Final Status Survey Data Reporting (Reference 1) and satisfies the requirements of Section 5.7.1 of the Fort Calhoun Station Decommissioning Project License Termination Plan (FCS; LTP; Reference 2).
An FSS sample plan for this survey unit was developed in accordance with procedure FCSD-RA-LT-302, Final Status Survey Sample Plan Development (Reference 3), the FCS LTP, and with guidance from NUREG-1575, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM; Reference 4).
Survey Unit 8103, an open land survey unit, has a MARSSIM classification of 3. A survey plan was designed based upon use of the Sign Test as the nonparametric statistical test for compliance. Both the Type I () and Type II () decision error rates were set at 0.05. As a random sample population, 14 soil samples were acquired from the survey unit. In addition, soil scanning was performed on 10% of the total surface area in the survey unit. The analytical results for all soil samples, both random and judgmental, taken in Survey Unit 8103 indicate that the maximum sum of fractions (SOF), considering the concentration of all applicable radionuclides of concern (ROC), is equal to 0.4305 when applying the respective operational derived concentration guideline levels (OpDCGLs) for soil. Therefore, the null hypothesis is rejected and Survey Unit 8103 is acceptable for unrestricted release. The mean SOF when applying the respective base case derived concentration guideline levels (BcDCGLs) for soil is 0.0263. This SOF equates to a dose for the survey unit of 0.6575 millirem per year (mrem/yr).
: 2. SURVEY UNIT DESCRIPTION

Survey Unit 8103 is an impacted Class 3 open land survey unit. The surface area of the survey unit is 58,497 meters (m)2.

The boundary of the survey unit and the location of the soil samples were defined using a Global Positioning System (GPS). Refer to Attachment 1 of this report for a figure depicting Survey Unit 8103.

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: 3. CLASSIFICATION BASIS

Survey Unit 8103 was identified in the technical support document (TSD) 20-001, Historical Site Assessment for Fort Calhoun Station (Reference 5) as a Class 3 survey unit. The initial site characterization surveys were conducted between November 2019 and July 2020. The following summarizes the results of the characterization survey for Survey Unit 8103.
In total, seven surface soil samples were collected in Survey Unit 8103. All samples were analyzed by the on-site gamma spectroscopy system. Cs-137 was detected at concentrations above the minimum detectable concentration (MDC) in three of the samples. Co-60 was not detected at concentrations above MDC in any of the surface soil samples. A summary of the analyses for surface soil samples taken during site characterization are presented in Table 3-1.
One sample from Survey Unit 8103 was randomly selected to be sent for off-site analysis of the initial suite of radionuclides. A summary of the off-site analysis for Survey Unit 8103 is presented in Table 3-2.

Table 3 Statistical Quantities for Cs-137 and Co-60 from the Characterization Survey of 8103 Surface Soil        Co-60     Cs-137
                               # of Samples               7
                                 # >MDC              0         3 Mean (pCi/g)       2.34E-02  1.70E-01 Median (pCi/g)      1.83E-02  1.60E-01 Max (pCi/g)        7.23E-02  3.16E-01 Min (pCi/g)       0.00E+00  4.29E-02 Standard Deviation (pCi/g) 2.30E-02 6.74E-02

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Table 3 Off-Site Analysis for Characterization Samples in 8103

Radionuclides     8100X-3-CJ-GSSX-044 Am-241              7.07E-02 Sb-125              4.66E-02 C-14               0.00E+00 Ce-144              1.02E-01 Cs-134              8.37E-02 Cs-137              1.72E-01 Co-57              4.55E-03 Co-58              0.00E+00 Co-60              0.00E+00 Cm-242              0.00E+00 Cm-243/244            0.00E+00 Eu-152              6.02E-03 Eu-154              0.00E+00 Eu-155              7.90E-02 Fe-55              2.18E+00 Mn-54               7.75E-03 Np-237              0.00E+00 Ni-59              0.00E+00 Ni-63              0.00E+00 Nb-94              5.79E-02 Pu-238              0.00E+00 Pu-239/240            7.86E-03 Pu-241              1.26E+00 Ag-110m              2.08E-02 Sr-90              1.33E-01 Tc-99              0.00E+00 H-3               0.00E+00 Zn-65              7.12E-02 Note: Bold values indicate concentration greater than MDC. Unbolded values indicate the value below MDC. All values in pCi/g.

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Based upon a review of the historical information, the results of the characterization survey data, and completion of a Survey Unit Classification Worksheet, the correct final classification of Survey Unit 8103 was determined to be Class 3.
: 4. DATA QUALITY OBJECTIVES

FSS planning and design rely on a properly executed data quality objective (DQO) process to ensure, through compliance with explicitly defined inputs and boundaries, that the primary objective of the survey is satisfied. The DQO process, utilized in accordance with MARSSIM, is described in the FCS LTP. The appropriate design for a given survey was developed using the DQO process as outlined in Appendix D of MARSSIM. A summary of the seven steps of the DQO process are outlined in the following paragraphs.
The DQO process incorporates hypothesis testing and probabilistic sampling distributions to control decision errors during data analysis. Hypothesis testing is a process based on the scientific method that compares a baseline condition to an alternate condition. The baseline condition is technically known as the null hypothesis. Hypothesis testing rests on the premise that the null hypothesis is true and sufficient evidence must be provided to reject it in favor of the alternative hypothesis. In designing the survey plan, the underlying assumption, or null hypothesis, was that residual activity in the survey unit exceeded the release criteria. Rejection of the null hypothesis would indicate that residual activity within the survey unit does not exceed the release criteria. Therefore, the survey unit would satisfy the primary objective of the FSS sample plan.
The primary objective of the FSS sample plan is to demonstrate that the level of residual radioactivity in Survey Unit 8103 did not exceed the release criteria specified in the LTP and that the potential dose from residual radioactivity is as low as is reasonably achievable (ALARA).
TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan (Reference 6) establishes the basis for an initial suite of potential ROC for decommissioning. LTP Chapter 2 provides detailed characterization data that describes the results of surveys completed of soil. Surface samples were taken in each impacted open land survey unit and analyzed for the presence of plant-derived radionuclides. The results of surface soil characterization in the impacted area surrounding FCS indicate that there is minimal residual radioactivity in soil.
Insignificant contributors (ICs) were determined consistent with the guidance contained in Section 3.3 of NUREG-1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance - Characterization , Survey, and Determination of Radiological Criteria (Reference

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7). For soil, the ROCs were found to be Cs-137, Co-60, Eu-152, and C-14. The remaining radionuclides were designated as IC and were eliminated from further detailed evaluation.
Section 5.2.6 of the LTP states that each radionuclide specific BcDCGL is equivalent to the level of residual radioactivity (above background levels) that could, when considered independently, result in a total effective dose equivalent (TEDE) of 25 mrem/yr to an Average Member of the Critical Group. To ensure that the summation of dose from each source term is 25 mrem/yr or less after all FSS is completed, the BcDCGLs are reduced based on an expected, or a priori, fraction of the 25 mrem/yr dose limit from each source term. The reduced DCGLs (i.e., OpDCGLs) can be related to the BcDCGLs as an expected fraction of dose based on an a priori assessment of what the expected dose should be based on the results of site characterization, process knowledge, and the extent of planned remediation. The OpDCGL is then used as the DCGL for the FSS design of the survey unit (e.g., calculation of surrogate DCGLs or, investigation levels). Details of the OpDCGLs derived for each dose component and the basis for the applied a priori dose fractions are provided in Section 5.2.6 of the LTP.
Multiple ROCs are known to be present at FCS. The dose contribution from each ROC is accounted for using the SOF to ensure that the total dose from all ROC does not exceed the dose criterion. A BcDCGL that is established for the average residual radioactivity in a survey unit is equivalent to a derived concentration guideline level wide area (DCGLW) as defined in MARSSIM.
At FCS, compliance is demonstrated through the summation of dose from seven distinct source terms (i.e., basements, soils, buried pipe, embedded pipe, above-ground structures, basement fill, and groundwater) for the end state. When applied to soil, the DCGLs are expressed in units of activity per unit of mass (pCi/g).
For FCS, soil is defined as a layer of soil beginning at the surface but extending to a depth of 1 m to allow for flexibility in compliance demonstration if contamination deeper than 0.15 m is encountered. Based on characterization data and historical information, there are no expectations of encountering a source term geometry that is comprised of a clean surface layer of soil over a contaminated subsurface soil layer. Section 6.9 of the LTP provides the exposure scenarios and modeling parameters that were used to calculate the site-specific soil DCGLs. The adjusted soil DCGLs for the unrestricted release of open land survey units as provided in the Section 6.16 of the LTP are presented in Table 4-1. The IC dose percentage of 5% was used to adjust the DCGLs in Table 4-1 to account for the dose from the eliminated IC radionuclides.

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Table 4 Base Case DCGLs for Soil Surface Soil  Subsurface Radionuclide   BcDCGL      Soil BcDCGL (pCi/g)       (pCi/g)
C-14       5.70E+01      9.68E+00 Co-60       3.77E+00      2.93E+00 Cs-137      1.31E+01      7.27E+00 Eu-152      8.41E+00      7.36E+00

The reduced DCGLs, OpDCGLs, are calculated using Equation 5-1 from Chapter 5 of the LTP as shown below.

Equation 4 OpDCGL Calculation

The OpDCGLs for the unrestricted release of soil are provided in Table 4-2.

Table 4 Operational DCGLs for Soil Surface Soil   Subsurface Soil Radionuclide    OpDCGL (pCi/g)       OpDCGL (pCi/g)
C-14             1.59E+01         2.71E+00 Co-60            1.06E-00         8.21E-01 Cs-137            3.65E+00         2.04E-00 Eu-152            2.36E+00         2.06E-00

Instrument DQOs included a verification of the ability of the survey instrument to detect the radiations of interest relative to the OpDCGL. Survey instrument response checks were required prior to issuance and after the instrument had been used. Control and accountability of survey instruments were required to assure the quality and prevent the loss of data.
As part of the DQOs applied to laboratory processes, analysis results were reported as actual calculated results. The actual reported value was used as the recorded FSS result for measurement and sample values that are less than MDC. Negative values were recorded as

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zero. Results were not reported as less than MDC. Sample report summaries included unique sample identification, analytical method, radionuclide, result, uncertainty, laboratory data qualifiers, units, and the observed MDC.
In accordance with the LTP, for laboratory analysis, MDCs less than 10% of the OpDCGL were preferable, while MDCs up to 50% of the OpDCGL were acceptable. The minimum acceptable MDC for measurements obtained using field instruments was 50% of the applicable OpDCGL.
: 5. SURVEY DESIGN

The level of effort associated with planning a survey is based on the complexity of the survey and nature of the hazards. Guidance for preparing FSS plans is provided in procedure FCSD-RA-LT-302, Final Status Survey Sample Plan Development (Reference 3).
The DQO process validated that Co-60, Cs-137, Eu-152, and C-14 would be the ROCs in Survey Unit 8103 as presented in LTP Section 5.2.5. As discussed in LTP Section 5.2.6.2, instead of inferring the concentrations for the hard-to-detect (HTD) ROC C-14 using a surrogate approach, 100% of all samples collected in the survey unit were sent for off-site analysis for the HTD ROC C-14. Table 5-1 presents the action levels for Survey Unit 8103 sample results and are based on 50% of the OpDCGLs.

Table 5 Action Levels for Survey Unit 8103 ROC            Action Level (pCi/g)
Co-60            5.30E-01 Cs-137           1.83E+00 Eu-152           1.18E+00 C-14            7.95E+00

The Sign Test was selected as the nonparametric statistical test to demonstrate compliance with the release criteria. The use of the Sign Test did not require the selection or use of a background reference area, which simplified survey design and implementation. This approach was conservative since it included background Cs-137 as part of the sample set.
The number of soil samples for FSS was determined in accordance with procedure FCSD-RA-LT-302 (Reference 3). The relative shift (/) for the survey unit data set is defined as shift (),
which is the upper boundary of the gray region (UBGR), or the DCGL (SOF of 1), minus the lower bound of the gray region (LBGR), divided by sigma (), which is the standard deviation of the data set used for survey design. The optimal value for / should range between 1 and 3.
The largest value the / can have is 3. If the calculated value of / exceeds 3, an adjusted

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value of 3 will be used for /. The / for Survey Unit 8103, based on the data for surface soil samples collected during the characterization of Survey Unit 8103, was calculated as follows:

Equation 5 Relative Shift
                                  =   (1 0.0717)  = 25.8 0.036

As the calculated relative shift was greater than 3, a value of 3 was used as the adjusted /.
Both the Type I error (i.e.,  value) and the Type II error (i.e.,  value) were set at 0.05. The sample size from Table 5.5 of MARSSIM that equates to the Type I and Type II error of 0.05 for use with the Sign Test is an N value of 14.
A prospective power curve was generated using MARSSIM Power 2000, a software package developed under the sponsorship of the United States Nuclear Regulatory Commission (NRC) for implementation of the MARSSIM in support of the decommissioning license termination rule (10 CFR 20, Subpart E). The result of the MARSSIM Power 2000 computer run showed adequate power for the survey design.
Given that the survey unit is Class 3, sample locations were selected randomly. The random locations of the soil samples were selected using a Visual Sample Plan (VSP), in accordance with FCSD-RA-LT-302 (Reference 3). Input parameters included use of aerial photographs and the random sampling tool set with a predetermined number (14) of samples. The random coordinates generated with VSP were integrated with a GPS to identify the sample locations in the field. Table 5-2 lists the random samples collected for FSS and the corresponding GPS coordinates, based on the Nebraska State Plane North American Datum 1983 coordinate system.

Table 5 Random Sample Locations Sample ID                    Northing                    Easting 8103X-3-FR-GSSX-001               195244.720                  826361.580 8103X-3-FR-GSSX-002               195273.828                  826373.176 8103X-3-FR-GSSX-003               195040.228                  826322.406 8103X-3-FR-GSSX-004               195215.428                  826434.449 8103X-3-FR-GSSX-005               195390.628                  826294.396 8103X-3-FR-GSSX-006               195118.095                  826350.417 8103X-3-FR-GSSX-007               195176.495                  826392.433 8103X-3-FR-GSSA-008               195351.695                  826336.412 8103X-3-FR-GSSX-009               195234.890                  826308.401 8103X-3-FR-GSSX-010               195263.628                  826260.132 8103X-3-FR-GSSX-011               195144.050                  826329.409 8103X-3-FR-GSSX-012               195027.250                  826301.398

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Sample ID                   Northing                     Easting 8103X-3-FR-GSSX-013              195202.450                  826413.441 8103X-3-FR-GSSX-014              195105.117                  826287.393

In accordance with the sample plan, at least one judgmental sample is required from the survey unit. The number of judgmental samples and measurements that were collected was 27, which brings the total number of samples collected for the FSS of Survey Unit 8103 to 41. Table 5-3 lists the judgmental samples or measurements collected for FSS and the corresponding GPS coordinates.

Table 5 Judgmental Sample or Measurement Locations Sample ID                  Northing                      Easting 8103X-3-FJ-GSSX-015             195190.210                   826282.730 8103X-3-FJ-GGDX-016              195121.171                   826282.488 8103X-3-FJ-GGDX-017              195109.706                   826329.005 8103X-3-FJ-GGDX-018              195107.720                   826330.044 8103X-3-FJ-GGDX-019              195252.796                   826279.208 8103X-3-FJ-GGDX-020              195254.666                   826297.995 8103X-3-FJ-GGDX-021              195256.277                   826292.707 8103X-3-FJ-GGDX-022              195255.900                   826282.488 8103X-3-FJ-GGDX-023              195258.871                   826288.619 8103X-3-FJ-GGDX-024              195235.404                   826285.977 8103X-3-FJ-GGDX-025              195238.292                   826293.612 8103X-3-FJ-GGDX-026              195239.902                   826300.658 8103X-3-FJ-GGDX-027              195238.048                   826306.306 8103X-3-FJ-GGDX-028              195236.605                   826303.545 8103X-3-FJ-GGDX-029              195238.083                   826306.756 8103X-3-FJ-GGDX-030              195233.459                   826375.216 8103X-3-FJ-GGDX-031              195273.419                   826367.963 8103X-3-FJ-GGDX-032              195272.821                   826372.454 8103X-3-FJ-GGDX-033              195041.832                   826306.21 8103X-3-FJ-GGDX-034              195040.033                   826305.482 8103X-3-FJ-GGDX-035              195038.427                   826310.417 8103X-3-FJ-GGDX-036              195046.763                   826323.778 8103X-3-FJ-GSSX-037             195255.900                   826282.488 8103X-3-FJ-GSSX-038             195121.171                   826282.488 8103X-3-FJ-GSSX-039             195038.427                   826310.417

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Sample ID                    Northing                       Easting 8103X-3-FJ-GSSX-040              195108.626                     826329.067 8103X-3-FJ-GSSX-041              195274.008                     826371.503

The implementation of quality control (QC) measures as referenced by Section 5.6.3 of the LTP and FCSD-RA-LT-100, Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station (QAPP; Reference 8) includes the collection of a soil sample for split sample analysis on 5%
of the soil samples taken in a survey unit with the locations selected at random. Three soil samples/measurements, 8103X-3-FR-GSSB-008, 8103X-3-FQ-GSSX-014, and 8103X-3-FQ-GGDX-016 were designated for split or duplicate sample QC analysis for the FSS of Survey Unit 8103.
Section 5.3.4 and Table 5-20 of the LTP specify that, for Class 3 open land survey units, surface scans will be performed on a judgmental percentage of the surface area in the survey unit. For Survey Unit 8103, 10% scan coverage was selected, which equals 5,850 m2.

For this Class 3 open land survey unit, the Investigation Levels for area scanning and soil sample measurement results are those levels specified in the Table 5-24 of the LTP and are reproduced below in Table 5 Investigation Levels

Table 5 Investigation Levels Classification           Scan Investigation Levels              Direct Investigation Levels Class 3           >Operational DCGL or >MDCscan if         >0.5 Operational DCGL MDCscan is greater than Operational DCGL

Table 5-5 provides a synopsis of the survey design for Survey Unit 8103.

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Table 5 Synopsis of Survey Design

Feature                       Design Criteria                        Basis Survey Unit Surface Area                 58,497 m2                           GPS

Number of Random Samples                     14                       *   / = 3 (adjusted)
(N)
* MARSSIM Table 5.5
* Co-60:  1.06 pCi/g DCGLs
* Cs-137: 3.65 pCi/g               Operational DCGLs for soil,
* Eu-152: 2.36 pCi/g                     LTP, Table 5-8
* C-14:    15.9 pCi/g Scan and Direct Investigation            Table 5-4                       LTP, Table 5-24 Levels Scan Areal Coverage                5,850 m2 (10% areal coverage)      LTP, Table 5-20

Judgmental                            1                           Per Survey Design Samples/Measurements                      27                        Actual Number Obtained HTD ROC Analysis                       100%                         LTP, Section 5.2.6.2 20                      Number of Samples Analyzed 1 duplicate and 1 split sample selected at   LTP, Section 5.6.3 QC                             random                      Actual Number Obtained 3
: 6. SURVEY IMPLEMENTATION

For Survey Unit 8103, compliance with the unrestricted release criteria was demonstrated through a combination of soil scanning with a Ludlum Model 44-20 gamma detector and the sampling of soil for isotopic analysis. A portable In Situ Object Counting System (ISOCS) unit was also utilized to investigate areas identified by scanning with the Ludlum Model 44-20 gamma detector.
A License Termination/Final Status Survey (LT/FSS) Supervisor performed a visual inspection and walk-down of the survey unit on December 15, 2021, prior to performing FSS. The purpose of the walk-down was to assess the physical condition of the survey unit, evaluate access points and travel paths, and identify potentially hazardous conditions. At the time of survey, the soil in the survey unit was dry and free of any considerable constraint for the collection of samples and scan measurements.
FSS field activities were conducted under the FSS sample plan, which included DQOs, survey design, detailed FSS instructions, job safety analysis, and related procedures for reference. FSS field activities were projected to take 10 working days to complete. Daily briefings were conducted to discuss the expectations for job performance and to review the safety aspects of

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the job. A Field Log was used to document field activities and other information pertaining to the performance of the FSS. FSS field activities commenced on January 24, 2022, and were concluded on November 8, 2022. Field activities were delayed due to the presence of Ospreys nesting in the area.
A total of 15 different scan areas were scanned using a Ludlum Model 3001 paired with a Ludlum Model 44-20 (3 x 3) sodium iodide (NaI) detector and a Trimble GPS unit. The background was established as the average of five one-minute static measurements, while maintaining the detector 2 from the soil. In Survey Unit 8103, background ranged from 18,087 counts per minutes (cpm) up to 28,182 cpm.
All designated scan areas were scanned using the Model 44-20 detector operated in the rate-meter mode and using audio response. The probe was positioned no more than 2 from the ground and was moved at a scan speed of approximately 0.25 m per second. In accordance with FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors (Reference 9), scan MDC was sufficient to detect residual radioactivity at the action level. Complete scan results are provided in Attachment 2.
The 14 random sample locations were marked with flags based on GPS coordinates provided.
Each soil sample consisted of approximately 1 liter of soil. The soil sample media was sifted to remove stones and other media larger than 1 centimeter in diameter. All soil samples were collected, controlled, transported, stored, and transferred to the on-site laboratory using the chain-of-custody process from FCSD-RA-LT-205, Chain-of-Custody Protocol for Site Characterization and Final Status Survey (Reference 10), and in accordance with FCSD-RA-LT-203, Sample Media Collection for Site Characterization and Final Status Survey (Reference 11) and FCSD-RA-LT-204, Sample Media Preparation for Site Characterization and Final Status Survey (Reference 12).
The survey design specified that 100% of the physical samples were required for the HTD ROC analysis. In total, 20 samples were selected for HTD radionuclide analysis.
The implementation of survey specific QC measures included the collection of three samples/measurements (8103X-3-FR-GSSB-008, 8103X-3-FQ-GSSX-014, and 8103X-3-FQ-GGDX-016) for split or duplicate sample analysis.
: 7. SURVEY RESULTS

All areas identified in the FSS sample plan were scanned for elevated activity levels. By scanning Survey Unit 8103 within accessible land, the 5,850 m2 scan requirement was achieved.
Figure 16-1 presents the scan areas within the unit. Judgmental samples did not have an Action Level, as the readings were taken to verify the readings identified in the Z-Score analysis. Table

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7-1 provides an overview of the scan results for all scan areas around each sample location and the gamma walkovers. Complete scan results are provided in Attachment 2, Table 16-1.

Table 7 Synopsis of Scan Results

Min Scan     Max Scan       Action      Scan Scan Area     Logged       Logged        Level     Alarms?         Judgmental Reading       Reading       (cpm)       (Y/N)    Samples/Measurements (cpm)         (cpm)
GW1         19050         30799        28578         Y                1 GW2         19050         28727        27099         Y                2 GW3         19050         32307        28906         Y                4 GW4         20074         29059        27428         Y                0 GW5         18087         29050        26586         Y                0 GW6         27600         33995        32762         Y                3 GW7         19018         33308        31860         Y                0 GW8         18087         29050        27079         Y                0 GW9         23205         35966        34647         Y                6 GW10        28182         35379        34524         Y                5 GW11        19015         34800        33152         Y                0 GW12        19034         34162        31758         Y                0 GW13        20014         34699        33848         Y                0 GW14        19014         33984        32270         Y                0 GW14QC        20464         36770        34524         Y                0 GW15        19225         36294        34524         Y                0

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For Survey Unit 8103 Grid 1, count rates ranged between 19,050 cpm and 30,799 cpm, with a mean count rate of 27,148 cpm and a standard deviation of 922 cpm. Figure 7-1 below presents a map of the gamma walkover for Survey Unit 8103 Grid 1.

Figure 7 Survey Unit 8103 Grid 1 GPS Scan Results

28,578 28,578

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An evaluation of Survey Unit 8103 Grid 1 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). One location was selected for biased sample collection based on evaluation of the gamma walkover data. This biased location represented the maximum measurements encountered within the scan area. The elevated area was investigated using ISOCS. Figure 7-2 below presents a map of the +3 Z-Score measurements within Survey Unit 8103 Grid 1 and the selected biased ISOCS measurement locations.

Figure 7 Survey Unit 8103 Grid 1 Z-Score and ISOCS Measurement Map

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For Survey Unit 8103 Grid 2, count rates ranged between 19,050 cpm and 28,727 cpm, with a mean count rate of 25,859 cpm and a standard deviation of 880 cpm. Figure 7-3 below presents a map of the gamma walkover for Survey Unit 8103 Grid 2.

Figure 7 Survey Unit 8103 Grid 2 GPS Scan Results

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An evaluation of Survey Unit 8103 Grid 2 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Two locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased lo cations represented the maximum measurements encountered within the scan area. The elevated areas were investigated using ISOCS. Figure 7-4 below presents a map of the +3 Z-Score measurements within Survey Unit 8103 Grid 2 and the selected biased ISOCS measurement locations.

Figure 7 Survey Unit 8103 Grid 2 Z-Score and ISOCS Measurement Map

For Survey Unit 8103 Grid 3, count rates ranged between 19,050 cpm and 32,307 cpm, with a mean count rate of 27,894 cpm and a standard deviation of 1,139 cpm. Figure 7-5 below presents a map of the gamma walkover for Survey Unit 8103 Grid 3.

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Figure 7 Survey Unit 8103 Grid 3 GPS Scan Results

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An evaluation of Survey Unit 8103 Grid 3 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). There were four locations selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. The elevated areas were investigated using ISOCS. Figure 7-6 below presents a map of the +3 Z-Score measurements within Survey Unit 8103 Grid 3 and the selected biased ISOCS measurement locations.

Figure 7 Survey Unit 8103 Grid 3 Z-Score and ISOCS Measurement Map

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For Survey Unit 8103 Grid 4, count rates ranged between 20,074 cpm and 29,059 cpm, with a mean count rate of 25,929 cpm and a standard deviation of 1,052 cpm. Figure 7-7 below presents a map of the gamma walkover for Survey Unit 8103 Grid 4.

Figure 7 Survey Unit 8103 Grid 4 GPS Scan Results

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An evaluation of Survey Unit 8103 Grid 4 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). No locations were selected for biased sample collection based on evaluation of the gamma walkover  data. Figure 7-8 below presents a map of the +3 Z-Score measurements within Survey Unit 8103 Grid 4.

Figure 7 Survey Unit 8103 Grid 4 Z-Score Map

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For Survey Unit 8103 Grid 5, count rates ranged between 18,087 cpm and 29,050 cpm, with a mean count rate of 24,672 cpm and a standard deviation of 1,967 cpm. Figure 7-9 below presents a map of the gamma walkover for Survey Unit 8103 Grid 5.

Figure 7 Survey Unit 8103 Grid 5 GPS Scan Results

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An evaluation was performed on Survey Unit 8103 Grid 5 data set, to assess the small areas of elevated activity which exceeded three standard deviations above the me an measurement (i.e.,
+3 Z-Score). No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-10 below presents a map of the +3 Z-Score measurements within Survey Unit 8103 Grid 5.

Figure 7 Survey Unit 8103 Grid 5 Z-Score Map

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For Survey Unit 8103 Grid 6, count rates ranged between 27,600 cpm and 33,995 cpm, with a mean count rate of 31,055 cpm and a standard deviation of 853 cpm. Figure 7-11 below presents a map of the gamma walkover for Survey Unit 8103 Grid 6.

Figure 7 Survey Unit 8103 Grid 6 GPS Scan Results

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An evaluation of Survey Unit 8103 Grid 6 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). There were three locations selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. The elevated areas were investigated using ISOCS. Figure 7-12 below presents a map of the +3 Z-Score measu rements within Survey Unit 8103 Grid 6 and the selected biased ISOCS measurement locations.

Figure 7 Survey Unit 8103 Grid 6 Z-Score and ISOCS Measurement Map

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For Survey Unit 8103 Grid 7, count rates ranged between 19,018 cpm and 33,308 cpm, with a mean count rate of 29,958 cpm and a standard deviation of 1,182 cpm. Figure 7-13 below presents a map of the gamma walkover for Survey Unit 8103 Grid 7.

Figure 7 Survey Unit 8103 Grid 7 GPS Scan Results

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An evaluation of Survey Unit 8103 Grid 7 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). There were no locations selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-14 below presents a map of the +3 Z-Score measurements within Survey Unit 8103 Grid 7.

Figure 7 Survey Unit 8103 Grid 7 Z-Score Map

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For Survey Unit 8103 Grid 8, count rates ranged between 18,087 cpm and 29,050 cpm, with a mean count rate of 24,672 cpm and a standard deviation of 1,967 cpm. Figure 7-15 below presents a map of the gamma walkover for Survey Unit 8103 Grid 8.

Figure 7 Survey Unit 8103 Grid 8 GPS Scan Results

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An evaluation of Survey Unit 8103 Grid 8 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). No location was selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-16 below presents a map of the +3 Z-Score measurements within Survey Unit 8103 Grid 8.

Figure 7 Survey Unit 8103 Grid 8 Z-Score Map

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For Survey Unit 8103 Grid 9, count rates ranged between 23,205 cpm and 35,966 cpm, with a mean count rate of 32,818 cpm and a standard deviation of 874 cpm. Figure 7-17 below presents a map of the gamma walkover for Survey Unit 8103 Grid 9.

Figure 7 Survey Unit 8103 Grid 9 GPS Scan Results

34,647 34,647

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An evaluation was performed with Survey Unit 8103 Grid 9 data set to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement (i.e.,
+3 Z-Score). Six locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. The elevated areas were investigated using ISOCS. Figure 7-18 below presents a map of the +3 Z-Score measurements within Survey Unit 8103 Grid 9 and the selected biased ISOCS measurement locations.

Figure 7 Survey Unit 8103 Grid 9 Z-Score and ISOCS Measurement Map

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For Survey Unit 8103 Grid 10, count rates ranged between 28,182 cpm and 35,379 cpm, with a mean count rate of 32,264 cpm and a standard deviation of 959 cpm. Figure 7-19 below presents a map of the gamma walkover for Survey Unit 8103 Grid 10.

Figure 7 Survey Unit 8103 Grid 10 GPS Scan Results

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An evaluation of Survey Unit 8103 Grid 10 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Five locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. The elevated areas were investigated using ISOCS. Figure 7-20 below presents a map of the +3 Z-Score measurements within Survey Unit 8103 Grid 10 and the selected biased ISOCS measurement locations.

Figure 7 Survey Unit 8103 Grid 10 Z-Score and ISOCS Measurement Map

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For Survey Unit 8103 Grid 11, count rates ranged between 19,015 cpm and 34,800 cpm, with a mean count rate of 30,813 cpm and a standard deviation of 2,703 cpm. Figure 7-21 below presents a map of the gamma walkover for Survey Unit 8103 Grid 11.

Figure 7 Survey Unit 8103 Grid 11 GPS Scan Results

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An evaluation of Survey Unit 8103 Grid 11 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). No location was selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-22 below presents a map of the +3 Z-Score measurements within Survey Unit 8103 Grid 11.

Figure 7 Survey Unit 8103 Grid 11 Z-Score Map

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For Survey Unit 8103 Grid 12, count rates ranged between 19.034 cpm and 34,162 cpm, with a mean count rate of 30,144 cpm and a standard deviation of 1,722 cpm. Figure 7-23 below presents a map of the gamma walkover for Survey Unit 8103 Grid 12.

Figure 7 Survey Unit 8103 Grid 12 GPS Scan Results

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An evaluation of Survey Unit 8103 Grid 12 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). There were no locations selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-24 below presents a map of the +3 Z-Score measurements within Survey Unit 8103 Grid 12.

Figure 7 Survey Unit 8103 Grid 12 Z-Score Map

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For Survey Unit 8103 Grid 13, count rates ranged between 20,014 cpm and 34,699 cpm, with a mean count rate of 31,703 cpm and a standard deviation of 1,426 cpm. Figure 7-25 below presents a map of the gamma walkover for Survey Unit 8103 Grid 13.

Figure 7 Survey Unit 8103 Grid 13 GPS Scan Results

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An evaluation of Survey Unit 8103 Grid 13 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-26 below presents a map of the +3 Z-Score measurements within Survey Unit 8103 Grid 13.

Figure 7 Survey Unit 8103 Grid 13 Z-Score Map

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For Survey Unit 8103 Grid 14, count rates ranged between 19,014 cpm and 33,984 cpm, with a mean count rate of 30,359 cpm and a standard deviation of 2,071 cpm. Figure 7-27  below presents a map of the gamma walkover for Survey Unit 8103 Grid 14.

Figure 7 Survey Unit 8103 Grid 14 GPS Scan Results

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An evaluation of Survey Unit 8103 Grid 14 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-28 below presents a map of the +3 Z-Score measurements within Survey Unit 8103 Grid 14.

Figure 7 Survey Unit 8103 Grid 14 Z-Score Map

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For Survey Unit 8103 Grid 14QC, count rates ranged between 20,464 cpm and 36,770 cpm, with a mean count rate of 32,541 cpm and a standard deviation of 2,265 cpm. Figure 7-29 below presents a map of the gamma walkover for Survey Unit 8103 Grid 14QC.

Figure 7 Survey Unit 8103 Grid 14QC GPS Scan Results

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An evaluation of Survey Unit 8103 Grid 14QC data set was performed to assess those small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e., +3 Z-Score). There were no locations selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-30 below presents a map of the +3 Z-Score measurements within Survey Unit 8103 Grid 14QC.

Figure 7 Survey Unit 8103 Grid 14QC Z-Score Map

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For Survey Unit 8103 Grid 15, count rates ranged between 19,225 cpm and 36,294 cpm, with a mean count rate of 27,588 cpm and a standard deviation of 3,775 cpm. Figure 7-31 below presents a map of the gamma walkover for Survey Unit 8103 Grid 15.

Figure 7 Survey Unit 8103 Grid 15 GPS Scan Results

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An evaluation of Survey Unit 8103 Grid 15 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). No location was selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-32 below presents a map of the +3 Z-Score measurements within Survey Unit 8103 Grid 15.

Figure 7 Survey Unit 8103 Grid 15 Z-Score Map

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The on-site laboratory analyzed the 14 soil samples taken for nonparametric statistical testing using the on-site gamma spectroscopy system. A summary of the results for the 14 samples collected for nonparametric statistical testing is provided in Table 7-2. Gamma spectroscopy results revealed that Cs-137 was detected in eight 8 of the 14 random samples The off-site laboratory, GEL Laboratories, analyzed the 14 random samples for the HTD ROC C-14. C-14 was not detected in any of the 14 random samples. The maximum operational sum of fractions (OpSOF) for random samples is 0.1657.
The basic statistics for the random sample population, as compared to the BcDCGLs, and the survey unit dose are summarized in Table 7-3.
The SOF or unity rule is the mathematical test used to evaluate compliance with radiological criteria for license termination when more than one radionuclide has been determined to be potentially present. The equation for the unity rule is:

Equation 7 Unity Rule

Where:  Cn = concentration of radionuclide n DCGLn = DCGL of radionuclide n.

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Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Random Samples

Sample ID            ROC       Activity    OpDCGL      Fraction of  OpSOF (pCi/g)      (pCi/g)     OpDCGL

Co-60     1.22E-01    1.06E+00     1.15E-01 8103X-3-FR-GSSX-001      Cs-137     2.96E-02    3.65E+00     8.11E-03    0.1232 Eu-152    0.00E+00     2.36E+00     0.00E+00 C-14     0.00E+00     1.59E+01     0.00E+00 Co-60     6.29E-02    1.06E+00     5.93E-02 8103X-3-FR-GSSX-002      Cs-137     1.55E-01    3.65E+00     4.25E-02    0.1018 Eu-152    0.00E+00     2.36E+00     0.00E+00 C-14     0.00E+00     1.59E+01     0.00E+00 Co-60     9.01E-02    1.06E+00     8.50E-02 8103X-3-FR-GSSX-003      Cs-137     1.06E-01    3.65E+00     2.90E-02    0.1657 Eu-152     1.22E-01    2.36E+00     5.17E-02 C-14     0.00E+00     1.59E+01     0.00E+00 Co-60     7.03E-02    1.06E+00     6.63E-02 8103X-3-FR-GSSX-004      Cs-137     7.18E-02    3.65E+00     1.97E-02    0.0860 Eu-152    0.00E+00     2.36E+00     0.00E+00 C-14     0.00E+00     1.59E+01     0.00E+00 Co-60    0.00E+00     1.06E+00     0.00E+00 8103X-3-FR-GSSX-005      Cs-137     2.71E-01    3.65E+00     7.42E-02    0.0877 Eu-152    0.00E+00     2.36E+00     0.00E+00 C-14      2.14E-01    1.59E+01     1.35E-02 Co-60     3.13E-02    1.06E+00     2.95E-02 8103X-3-FR-GSSX-006      Cs-137     1.28E-01    3.65E+00     3.51E-02    0.0819 Eu-152     4.08E-02    2.36E+00     1.73E-02 C-14     0.00E+00     1.59E+01     0.00E+00 Co-60     3.46E-02    1.06E+00     3.26E-02 8103X-3-FR-GSSX-007      Cs-137     1.13E-01    3.65E+00     3.10E-02    0.0682 Eu-152    0.00E+00     2.36E+00     0.00E+00 C-14      7.23E-02    1.59E+01     4.55E-03 Co-60     3.19E-02    1.06E+00     3.01E-02 Cs-137     2.61E-01    3.65E+00     7.15E-02 8103X-3-FR-GSSA-008      Eu-152    0.00E+00     2.36E+00     0.00E+00    0.1016

C-14     0.00E+00     1.59E+01     0.00E+00

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Sample ID            ROC        Activity    OpDCGL      Fraction of  OpSOF (pCi/g)      (pCi/g)     OpDCGL

Co-60     5.50E-02     1.06E+00     5.19E-02 8103X-3-FR-GSSX-009       Cs-137    1.07E-01     3.65E+00     2.93E-02     0.0812 Eu-152    0.00E+00     2.36E+00     0.00E+00 C-14     0.00E+00     1.59E+01     0.00E+00 Co-60     4.71E-02     1.06E+00     4.44E-02 8103X-3-FR-GSSX-010       Cs-137    1.23E-01     3.65E+00     3.37E-02     0.0855 Eu-152    1.74E-02     2.36E+00     7.37E-03 C-14     0.00E+00     1.59E+01     0.00E+00 Co-60     1.33E-02     1.06E+00     1.25E-02 8103X-3-FR-GSSX-011       Cs-137    2.71E-01     3.65E+00     7.42E-02     0.0868 Eu-152    0.00E+00     2.36E+00     0.00E+00 C-14     0.00E+00     1.59E+01     0.00E+00 Co-60     5.96E-02     1.06E+00     5.62E-02 8103X-3-FR-GSSX-012       Cs-137    1.27E-01     3.65E+00     3.48E-02     0.0910 Eu-152    0.00E+00     2.36E+00     0.00E+00 C-14     0.00E+00     1.59E+01     0.00E+00 Co-60     0.00E+00     1.06E+00     0.00E+00 8103X-3-FR-GSSX-013       Cs-137    1.25E-01     3.65E+00     3.42E-02     0.0570 Eu-152    2.70E-02     2.36E+00     1.14E-02 C-14     1.75E-01     1.59E+01     1.10E-02 Co-60     2.81E-02     1.06E+00     2.65E-02 8103X-3-FR-GSSX-014       Cs-137    9.30E-02     3.65E+00     2.55E-02     0.0977 Eu-152    1.05E-01     2.36E+00     4.45E-02 C-14     1.89E-02     1.59E+01     1.19E-03 Note: Bold values indicate concentrations greater than MDC.

Table 7 Basic Statistical Properties of Random Sample Population and Survey Unit Dose ROC       Mean       Median       Max         Min       Std. Dev. BcDCGL     Avg BcSOF     Avg Dose (pCi/g)    (pCi/g)     (pCi/g)     (pCi/g)     (pCi/g)    (pCi/g)     per ROC      per ROC Co-60    4.62E-02   4.09E-02    1.22E-01    0.00E+00    3.40E-02   3.77E+00     1.22E-02     3.06E-01 Cs-137   1.42E-01   1.24E-01    2.71E-01    2.96E-02    7.44E-02   1.31E+01     1.08E-02     2.70E-01 Eu-152   2.23E-02   0.00E+00    1.22E-01    0.00E+00    4.08E-02   8.41E+00     2.65E-03     6.63E-02 C-14    3.43E-02   0.00E+00    2.14E-01    0.00E+00    7.10E-02   5.70E+01     6.02E-04     1.50E-02

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Mean base case sum of fractions (BcSOF) =
0.0263 DOSE ASSIGNED TO SURVEY UNIT =
0.6575 mrem/yr The on-site laboratory analyzed the six judgmental soil samples using the on-site gamma spectroscopy system. An ISOCS system with a 1 m2  field of view was also utilized for investigations. Twenty-one judgmental ISOCS measurements were collected for investigation.
Surface soil samples have GSS in the sample nomenclature; ISOCS measurements have GGD in the measurement nomenclature. A summary of the analytical results for the judgmental soil samples and ISOCS measurements is provided in Table 7-4. Gamma spectroscopy results revealed that Cs-137 was positively identified in 12 judgmental samples or measurements. No other ROCs were positively identified. GEL Laboratories analyzed the six judgmental samples for the HTD ROC C-14. C-14 was not detected in any of the six judgmental samples. The maximum OpSOF for judgmental samples/measurements is 0.8461. This location, as well as four other ISOCS measurement locations, were further investigated and physical samples were taken. The ISOCS locations 16, 18, 22, 31, and 35 were sampled. These samples were samples 37 through 41.

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples/Measurements

Measured    OpDCGL      Fraction of Sample ID          ROC        Activity    (pCi/g)     OpDCGL      OpSOF (pCi/g)

Co-60     0.00E+00    1.06E+00     0.00E+00 8103X-3-FJ-GSSX-015    Cs-137     8.70E-02    3.65E+00     2.38E-02     0.1312 Eu-152     1.91E-01    2.36E+00     8.09E-02 C-14      4.20E-01    1.59E+01     2.64E-02 Co-60     5.33E-02    1.06E+00     5.03E-02 8103X-3-FJ-GGDX-016     Cs-137     1.46E-01    3.65E+00     3.99E-02     0.0903 Eu-152     0.00E+00    2.36E+00     0.00E+00 C-14      0.00E+00    1.59E+01     0.00E+00 Co-60     0.00E+00    1.06E+00     0.00E+00 Cs-137     2.09E-01    3.65E+00     5.73E-02 Eu-152     0.00E+00    2.36E+00     0.00E+00

8103X-3-FJ-GGDX-017                                                      0.0573

C-14      0.00E+00    1.59E+01     0.00E+00

8103X-3-FJ-GGDX-018      Co-60     2.78E-01    1.06E+00     2.62E-01     0.7794

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Measured     OpDCGL       Fraction of Sample ID            ROC        Activity     (pCi/g)      OpDCGL       OpSOF (pCi/g)

Cs-137      4.80E-01    3.65E+00      1.31E-01 Eu-152      9.10E-01    2.36E+00      3.86E-01 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      3.15E-02    1.06E+00      2.97E-02 8103X-3-FJ-GGDX-019      Cs-137      2.13E-01    3.65E+00      5.82E-02     0.1255 Eu-152      8.85E-02    2.36E+00      3.75E-02 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      3.26E-01    1.06E+00      3.08E-01 8103X-3-FJ-GGDX-020      Cs-137      1.95E-01    3.65E+00      5.35E-02     0.4305 Eu-152      1.64E-01    2.36E+00      6.94E-02 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      0.00E+00    1.06E+00      0.00E+00 8103X-3-FJ-GGDX-021      Cs-137      8.50E-02    3.65E+00      2.33E-02     0.0233 Eu-152      0.00E+00    2.36E+00      0.00E+00 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      5.66E-02    1.06E+00      5.34E-02 8103X-3-FJ-GGDX-022      Cs-137      2.48E-01    3.65E+00      6.79E-02     0.3876 Eu-152      6.28E-01    2.36E+00      2.66E-01 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      0.00E+00    1.06E+00      0.00E+00 8103X-3-FJ-GGDX-023      Cs-137      2.06E-01    3.65E+00      5.64E-02     0.0564 Eu-152      0.00E+00    2.36E+00      0.00E+00 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      6.67E-02    1.06E+00      6.29E-02 8103X-3-FJ-GGDX-024      Cs-137      1.75E-01    3.65E+00      4.80E-02     0.1109 Eu-152      0.00E+00    2.36E+00      0.00E+00 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      5.33E-02    1.06E+00      5.03E-02 8103X-3-FJ-GGDX-025      Cs-137      2.53E-01    3.65E+00      6.93E-02     0.1412 Eu-152      5.10E-02    2.36E+00      2.16E-02 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      1.21E-01    1.06E+00      1.14E-01 8103X-3-FJ-GGDX-026      Cs-137      2.50E-01    3.65E+00      6.86E-02     0.1830 Eu-152      0.00E+00    2.36E+00      0.00E+00 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      1.15E-01    1.06E+00      1.08E-01 8103X-3-FJ-GGDX-027      Cs-137      1.35E-01    3.65E+00      3.69E-02     0.1563 Eu-152      2.68E-02    2.36E+00      1.13E-02 C-14       0.00E+00    1.59E+01      0.00E+00 8103X-3-FJ-GGDX-028       Co-60      1.32E-01    1.06E+00      1.24E-01     0.1502

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Measured     OpDCGL       Fraction of Sample ID            ROC        Activity     (pCi/g)     OpDCGL        OpSOF (pCi/g)

Cs-137      9.44E-02    3.65E+00      2.59E-02 Eu-152      0.00E+00    2.36E+00      0.00E+00 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      6.86E-02    1.06E+00      6.47E-02 8103X-3-FJ-GGDX-029      Cs-137      2.43E-01    3.65E+00      6.66E-02     0.1944 Eu-152      1.49E-01    2.36E+00      6.32E-02 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      9.78E-03    1.06E+00      9.23E-03 8103X-3-FJ-GGDX-030      Cs-137      4.37E-01    3.65E+00      1.20E-01     0.3092 Eu-152      4.26E-01    2.36E+00      1.80E-01 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      1.45E-01    1.06E+00      1.37E-01 8103X-3-FJ-GGDX-031      Cs-137      3.77E-01    3.65E+00      1.03E-01     0.8461 Eu-152      1.43E+00    2.36E+00      6.06E-01 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      1.19E-01    1.06E+00      1.13E-01 8103X-3-FJ-GGDX-032      Cs-137      0.00E+00    3.65E+00      0.00E+00     0.1127 Eu-152      0.00E+00    2.36E+00      0.00E+00 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      1.71E-01    1.06E+00      1.62E-01 8103X-3-FJ-GGDX-033      Cs-137      2.70E-01    3.65E+00      7.41E-02     0.2356 Eu-152      0.00E+00    2.36E+00      0.00E+00 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      0.00E+00    1.06E+00      0.00E+00 8103X-3-FJ-GGDX-034      Cs-137      2.55E-01    3.65E+00      6.97E-02     0.06973 Eu-152      0.00E+00    2.36E+00      0.00E+00 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      0.00E+00    1.06E+00      0.00E+00 8103X-3-FJ-GGDX-035      Cs-137      2.41E-01    3.65E+00      6.60E-02     0.06603 Eu-152      0.00E+00    2.36E+00      0.00E+00 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      1.33E-01    1.06E+00      1.25E-01 8103X-3-FJ-GGDX-036      Cs-137      1.51E-01    3.65E+00      4.13E-02     0.16680 Eu-152      0.00E+00    2.36E+00      0.00E+00 C-14       0.00E+00    1.59E+01      0.00E+00 Co-60      2.13E-02    1.06E+00      2.01E-02 8103X-3-FJ-GSSX-037      Cs-137      1.69E-01    3.65E+00      4.63E-02     0.10623 Eu-152      9.40E-02    2.36E+00      3.98E-02 C-14       0.00E+00    1.59E+01      0.00E+00 8103X-3-FJ-GSSX-038       Co-60      7.12E-02    1.06E+00      6.72E-02     0.16432

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Measured    OpDCGL       Fraction of Sample ID           ROC        Activity    (pCi/g)     OpDCGL       OpSOF (pCi/g)

Cs-137     2.53E-01     3.65E+00     6.93E-02 Eu-152     6.57E-02     2.36E+00     2.78E-02 C-14      0.00E+00     1.59E+01    0.00E+00 Co-60     7.23E-02     1.06E+00     6.82E-02 8103X-3-FJ-GSSX-039     Cs-137     1.87E-01     3.65E+00     5.12E-02    0.13032 Eu-152     0.00E+00     2.36E+00    0.00E+00 C-14      1.73E-01     1.59E+01     1.09E-02 Co-60     1.12E-01     1.06E+00     1.06E-01 8103X-3-FJ-GSSX-040     Cs-137     7.44E-02     3.65E+00     2.04E-02    0.13573 Eu-152     0.00E+00     2.36E+00    0.00E+00 C-14      1.54E-01     1.59E+01     9.69E-03 Co-60     5.33E-02     1.06E+00     5.03E-02 8103X-3-FJ-GSSX-041     Cs-137     2.53E-01     3.65E+00     6.93E-02    0.14124 Eu-152     5.10E-02     2.36E+00     2.16E-02 C-14      0.00E+00     1.59E+01    0.00E+00 Note: Bold values indicate concentrations greater than MDC.

The implementation of survey specific QC measurements included the collection of three samples/measurements (8103X-3-FR-GSSB-008, 8103X-3-FQ-GSSX-014, and 8103X-3-FQ-GGDX-016) for split or duplicate sample analysis. The on-site laboratory analyzed the QC samples using the on-site gamma spectroscopy system. A summary of the analytical results for the QC samples is provided in Table 7-5. Gamma spectroscopy results revealed that Cs-137 was positively identified in one QC sample. No other ROCs were positively identified in any QC sample. The maximum OpSOF for QC samples is 0.2699.

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples

Activity    Operational   Fraction Sample ID          ROC         (pCi/g)       DCGL           of       OpSOF (pCi/g)    OpDCGL

Co-60      0.00E+00      1.06E+00     0.00000 Cs-137     1.52E-01      3.65E+00     0.04164 Eu-152     7.84E-02      2.36E+00     0.03322 8103X-3-FR-GSSB-008                                                        0.07486

C-14       0.00E+00      1.59E+01     0.00000

8103X-3-FQ-GSSX-014      Co-60      1.86E-02      1.06E+00     0.01755     0.05645

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Activity    Operational  Fraction Sample ID          ROC        (pCi/g)      DCGL         of        OpSOF (pCi/g)   OpDCGL

Cs-137     1.42E-01     3.65E+00    0.03890 Eu-152     0.00E+00     2.36E+00    0.00000 C-14      0.00E+00     1.59E+01    0.00000 Co-60      3.98E-02     1.06E+00    0.03754 Cs-137     3.63E-01     3.65E+00    0.09957 8103X-3-FQ-GGDX-016    Eu-152     3.13E-01     2.36E+00    0.13281     0.26992

C-14      0.00E+00     1.59E+01    0.00000 Note: Bold values indicate concentrations greater than MDC.
: 8. QUALITY CONTROL

The on-site laboratory processed three split and duplicate samples/measurements (8103X-3-FR-GSSB-008, 8103X-3-FQ-GSSX-014, and 8103X-3-FQ-GGDX-016) using gamma spectroscopy analysis. The data was evaluated using the acceptance criteria specified in NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual (Reference 13) as detailed by Section 5.6.3.2 of the LTP. There was acceptable agreement between standard and comparison sample results in all cases. Refer to Attachment 4 for data and QC analysis results.
: 9. INVESTIGATIONS AND RESULTS

During the FSS of Survey Unit 8103, areas with a +3 sigma Z-Score were investigated. Twenty-seven judgmental samples/measurements were collected for investigation, all with radiological concentrations below the OpDCGL.
: 10. REMEDIATION AND RESULTS

No radiological remedial action as described by MARSSIM Section 5.4 was performed in Survey Unit 8103 prior to or as a result of the FSS. Chapter 4 of the LTP determined that remediation beyond that required to meet the release criteria is unnecessary and the remaining residual radioactivity in soil was ALARA.
: 11. CHANGES FROM THE FINAL STATUS SURVEY PLAN

There were no addendums to the FSS plan.

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: 12. DATA QUALITY ASSESSMENT

The DQO sample design and data were reviewed in accordance with FCSD-RA-LT-304, Final Status Survey Data Assessment (Reference 14) for completeness and consistency.
Documentation was complete and legible. Surveys and the collection of samples were consistent with the DQOs and were sufficient to ensure that the survey unit was properly designated as Class 3. The survey design had adequate power as indicated by the retrospective power curve (see Attachment 6, Figure 16-5).
The measurement results indicated that all samples were less than a SOF of 1 when compared to the OpDCGLs.
Although MARSSIM states that the Sign Test need not be performed in the instance that no measurements surpass the OpDCGL, the test was conducted to demonstrate adherence to the statistical principles of the DQO process. The Sign Test was performed on the data and compared to the original assumptions of the DQOs. The evaluation of the Sign Test results clearly demonstrates that Survey Unit 8103 passes the unrestricted release criteria, thus, the null hypothesis is rejected. The results of the Sign Test are presented in Attachment 3.
The preliminary data review consisted of calculating basic statistical quantities (e.g., mean, median, standard deviation). All data was considered valid including negative values, zeros, and values reported below the MDC. The mean and median values for each ROC were well below the respective OpDCGLs. Also, the retrospective power curve shows that enough samples were collected to achieve the desired power; therefore, Survey Unit 8103 meets the unrestricted release criteria with adequate power as required by the DQOs.
The mean of all identified isotopes is less than the Consultation Triggers for Residential Soil Concentration depicted in Table H.1 of NUREG 1757, Vol.1, Rev. 2 (Memorandum of Understanding Table 1). The full table is included in Attachment 5 of this release record.
The data for Cs-137 is presented graphically through a frequency plot and quantile plot. All graphical presentations are provided in Attachment 6.
: 13. ANOMALIES

No anomalies were observed during the performance or analyses of the survey.

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: 14. CONCLUSION

Survey Unit 8103 has met the DQOs of the FSS plan. The ALARA criteria as specified in Chapter 4 of the LTP were achieved. The elevated measurement comparison for soils was not applicable and remediation was not required.
All identified ROCs were used for statistical testing to determine the adequacy of Survey Unit 8103 for FSS. Evaluation of the data shows that none of the random ROC concentration values exceeds the OpDCGLs; therefore, in accordance with LTP Section 5.2.6, the survey unit meets the release criteria.
The sample data passed the Sign Test. The null hypothesis was rejected. The retrospective power curve showed that adequate power was achieved. Survey Unit 8103 is properly classified as Class 3.
The dose contribution from soil in Survey Unit 8103 is 0.6575 mrem/yr TEDE, based on the average concentration of the ROC in samples used for nonparametric statistical testing.
Survey Unit 8103 is acceptable for unrestricted release.
: 15. REFERENCES
: 1. FCSD-RA-LT-305, Final Status Survey Data Reporting
: 2. Fort Calhoun Station Decommissioning Project License Termination Plan
: 3. FCSD-RA-LT-302, Final Status Survey Sample Plan Development
: 4. NUREG-1575, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual
: 5. TSD 20-001, Historical Site Assessment for Fort Calhoun Station
: 6. TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan
: 7. NUREG-1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance
             - Characterization, Survey, and Determination of Radiological Criteria - Draft Report for Comment
: 8. FCSD-RA-LT-100, Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station
: 9. FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors

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: 10. FCSD-RA-LT-205, Chain-of-Custody Protocol for Site Characterization and Final Status Survey
: 11. FCSD-RA-LT-203, Sample Media Collection for Site Characterization and Final Status Survey
: 12. FCSD-RA-LT-204, Sample Media Preparation for Site Characterization and Final Status Survey
: 13. NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual
: 14. FCSD-RA-LT-304, Final Status Survey Data Assessment
: 16. ATTACHMENTS

Attachment 1 - Figures Attachment 2 - Scan Data Attachment 3 - Sign Test Attachment 4 - Quality Control Assessment Attachment 5 - Consultation Triggers for Residential Soil Concentrations Attachment 6 - Graphical Presentations

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ATTACHMENT 1- RANDOM AND JUDGMENTAL SAMPLE LOCATIONS

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Figure 16 Survey Unit 8103 Random Scan and  Sample Locations Map

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Figure 16 Survey Unit 8103 Judgmental Sample Locations Map

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ATTACHMENT 2- COMPLETE SCAN DATA

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Table 16 Survey Unit 8103 Complete Scan Data

Min      Max Detector  Detector   M3001    Survey                 Avg         Action     Scan      Scan      Scan Type       ID         ID       Unit   Location   Background     Level     Logged    Logged   Alarms?
(cpm)       (cpm)      Result   Result    (Y/N)
(cpm)     (cpm) 44-20   PR404738   25021210   8103      GW1         27140       28578      19050     30799      Y 44-20   PR403795   25021219   8103      GW2         25700       27099      19050     28727      Y 44-20   PR404738   25021210   8103      GW3         27460       28906      19050     32307      Y 44-20   PR403795   25021219   8103      GW4         26020       27428      20074     29059      Y 44-20   PR404738   25021210   8103      GW5         25200       26586      18087     29050      Y 44-20   PR397732   25021209   8103      GW6         31220       32762      27600     33995      Y 44-20   PR397732   25021209   8103      GW7         30340       31860      19018     33308      Y 44-20   PR403795   25021219   8103      GW8         25680       27079      18087     29050      Y 44-20   PR404738   25021210   8103      GW9         33060       34647      23205     35966      Y 44-20   PR404738   25021210   8103     GW10         32940       34524      28182     35379      Y 44-20   PR404738   25021210   8103     GW11         31600       33152      19015     34800      Y 44-20   PR397732   25021209   8103     GW12         30240       31758      19034     34162      Y 44-20   PR403795   25021219   8103     GW13         32280       33848      20014     34699      Y 44-20   PR404738   25021210   8103     GW14         30740       32270      19014     33984      Y 44-20   PR403795   25021219   8103    GW14QC        32940       34524      20464     36770      Y 44-20   PR404738   25021210   8103     GW15         32940       34524      19225     36294      Y

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ATTACHMENT 3 - SIGN TEST

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Table 16 Survey Unit 8103 Sign Test

                              #           SOF          1-Ws         Sign (Ws) 1        0.12320        0.88          +1 2        0.10181        0.90          +1 3        0.16574        0.83          +1 4        0.08599        0.91          +1 5        0.08771        0.91          +1 6        0.08188        0.92          +1 7        0.06815        0.93          +1 8        0.10160        0.90          +1 9        0.08120        0.92          +1 10        0.08551        0.91          +1 11        0.08679        0.91          +1 12        0.09102        0.91          +1 13        0.05669        0.94          +1 14        0.09767        0.90          +1

Number of positive differences (S+)        14

Critical Value      10

Survey Unit            Meets the Acceptance Criteria

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ATTACHMENT 4 - QUALITY CONTROL ASSESSMENT

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Table 16 Survey Unit 8103 QC Assessment

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ATTACHMENT 5 - CONSULTATION TRIGGERS FOR RESIDENTIAL SOIL CONCENTRATION

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T.E 1

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ATTACHMENT 6 - GRAPHICAL PRESENTATIONS

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Figure 16 Quantile Plot for Cs-137 Concentration

Quantile Plot For Cs       -137

3.00E-01

2.50E-01

2.00E-01

1.50E-01

1.00E-01

5.00E-02

0.00E+00 0%    10%   20%   30%    40%   50%   60%    70%   80%   90%   100%

PERCENTAGE

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Figure 16 Histogram for Cs-137 Concentration

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Figure 16 Retrospective Power Curve for Survey Unit 8103

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FORT CALHOUN STATION FINAL STATUS SURVEY RELEASE RECORD

SURVEY UNIT 8104 NORTH OWNER CONTROLLED AREA

REVISION 0 FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8104 NORTH OWNER CONTROLLED AREA

PREPARED BY / DATE:
M. Uz, LT/FSS Specialist

REVIEWED      BY / DATE:
M. Bryant, LT/FSS Specialist

REVIEWED      BY / DATE:
A. Barker Regulatory Assurance & Emergency Planning Manager

REVIEWED      BY / DATE:
D. Whisler Manager Radiation Protection & Chemistry

APPROVED BY / DATE:
B. Bishop, LT/FSS Manager

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TABLE OF CONTENTS
: 1.                                                EXECUTIVE 

==SUMMARY==
 ................................................................................................................................. 8
: 2.                                                 SURVEY UNIT DESCRIPTION ....................................................................................................................... 8
: 3.                                                CLASSIFICATION BASIS ................................................................................................................................. 8
: 4.                                                DATA QUALITY OBJECTIVES .................................................................................................................... 10
: 5.                                                 SURVEY DESIGN ............................................................................................................................................. 13
: 6.                                                SURVEY IMPLEMENTATION ...................................................................................................................... 17
: 7.                                                 SURVEY RESULTS .......................................................................................................................................... 18
: 8.                                                 QUALITY CONTROL ...................................................................................................................................... 61
: 9.                                                 INVESTIGATIONS AND RESULTS .............................................................................................................. 61
: 10.                             REMEDIATION AND RESULTS ................................................................................................................... 62
: 11.                             CHANGES FROM THE FINAL STATUS SURVEY PLAN ........................................................................ 62
: 12.                             DATA QUALITY ASSESSMENT ................................................................................................................... 62
: 13.                             ANOMALIES ..................................................................................................................................................... 63
: 14.                             CONCLUSION ..................................................................................................................................................          63
: 15.                             REFERENCES................................................................................................................................................... 63
: 16.                             ATTACHMENTS ..............................................................................................................................................          64

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LIST OF TABLES

Table 3 Statistical Quantities for Cs-137 and Co-60 from the Characterization Survey of 8104 .................... 9 Table 3 Off-site Analysis for Characterization Samples in 8104 ........................................................................ 9 Table 4 Base Case DCGLs for Soil ..................................................................................................................... 12 Table 4 Operational DCGLs for Soil .................................................................................................................. 12 Table 5 Action Levels for Survey Unit 8104 ....................................................................................................... 13 Table 5 Random Sample Locations .................................................................................................................... 15 Table 5 Judgmental Sample Locations ............................................................................................................... 15 Table 5 Investigation Levels ................................................................................................................................          16 Table 5 Synopsis of Survey Design ...................................................................................................................... 16 Table 7 Synopsis of Scan Results ........................................................................................................................ 18 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Samples Comprising the Statistical Sample Population ........................................................................................................................... 56 Table 7 Basic Statistical Properties of Random Sample Population and Survey Unit Dose   .......................... 58 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples .... 59 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples   .................. 61 Table 16 Survey Unit 8104 Complete Scan Data ............................................................................................... 68 Table 16 Survey Unit 8104 Sign Test .................................................................................................................. 70 Table 16 Survey Unit 8104 QC Assessment ....................................................................................................... 72

LIST OF FIGURES

Figure 7 Survey Unit 8104 Grid 1 GPS Scan Results  ........................................................................................ 20 Figure 7 Survey Unit 8104 Grid 1 Z-Score ......................................................................................................... 21 Figure 7 Survey Unit 8104 Grid 2 GPS Scan Results  ........................................................................................ 22 Figure 7 Survey Unit 8104 Grid 2 Z-Score ......................................................................................................... 23 Figure 7 Survey Unit 8104 Grid 2 Samples (Locations 21-27) ......................................................................... 24 Figure 7 Survey Unit 8104 Grid 3 GPS Scan Results  ........................................................................................ 25 Figure 7 Survey Unit 8104 Grid 3 Z-Score ......................................................................................................... 26 Figure 7 Survey Unit 8104 Grid 4 GPS Scan Results  ........................................................................................ 27 Figure 7 Survey Unit 8104 Grid 4 Z-Score ......................................................................................................... 28 Figure 7 Survey Unit 8104 Grid 5 GPS Scan Results  ...................................................................................... 29 Figure 7 Survey Unit 8104 Grid 5 Z -Score ....................................................................................................... 30 Figure 7 Survey Unit 8104 Grid 6 GPS Scan Results  ...................................................................................... 31 Figure 7 Survey Unit 8104 Grid 6 Z -Score ....................................................................................................... 32 Figure 7 Survey Unit 8104 Grid 7 GPS Scan Results  ...................................................................................... 33 Figure 7 Survey Unit 8104 Grid 7 Z -Score ....................................................................................................... 34 Figure 7 Survey Unit 8104 Grid 8 GPS Scan Results  ...................................................................................... 35 Figure 7 Survey Unit 8104 Grid 8 Z -Score ....................................................................................................... 36 Figure 7 Survey Unit 8104 Grid 9 GPS Scan Results  ...................................................................................... 37 Figure 7 Survey Unit 8104 Grid 9 Z -Score ....................................................................................................... 38 Figure 7 Survey Unit 8104 Grid 10 GPS Scan Results  .................................................................................... 39 Figure 7 Survey Unit 8104 Grid 10 Z-Score         ..................................................................................................... 40

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Figure 7 Survey Unit 8104 Grid 10 Samples (Locations 18 & 19)    .................................................................. 41 Figure 7 Survey Unit 8104 Grid 11 GPS Scan Results  .................................................................................... 42 Figure 7 Survey Unit 8104 Grid 11 Z-Score         ..................................................................................................... 43 Figure 7 Survey Unit 8104 Grid 12 GPS Scan Results           .................................................................................... 44 Figure 7 Survey Unit 8104 Grid 12 Z-Score         ..................................................................................................... 45 Figure 7 Survey Unit 8104 Grid 12 Samples (Locations 16 & 17)    .................................................................. 46 Figure 7 Survey Unit 8104 Grid 13 GPS Scan Results  .................................................................................... 47 Figure 7 Survey Unit 8104 Grid 13 Z-Score         ..................................................................................................... 48 Figure 7 Survey Unit 8104 Grid 13 Sample (Location 20)   .............................................................................. 49 Figure 7 Survey Unit 8104 Grid 14 GPS Scan Results  .................................................................................... 50 Figure 7 Survey Unit 8104 Grid 14 Z-           Score         ..................................................................................................... 51 Figure 7 Survey Unit 8104 Grid 15 GPS Scan Results and Judgmental Sample (Location 15)   .................. 52 Figure 7 Survey Unit 8104 Grid 15 Z-Score         ..................................................................................................... 53 Figure 7 Survey Unit 8104 Grid 9QC GPS Scan Results  ................................................................................ 54 Figure 7 Survey Unit 8104 Grid 9QC Z -Score         .................................................................................................          55 Figure 16 Survey Unit 8104 Scan Locations Map  ..............................................................................................          66 Figure 16 Quantile Plot for Cs-137 Concentration ............................................................................................ 76 Figure 16 Histogram for Cs-137 Concentration ................................................................................................          77 Figure 16 Retroscpective Power Curve for Survey Unit 8104 .......................................................................... 78

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LIST OF ABBREVIATIONS delta
/                                                                                                                                                                                                     relative shift sigma ALARA                                                                                                               as low as is reasonably achievable BcDCGL                                                                                            base case derived concentration guideline level BcSOF                                                                                                                                      base case sum of fractions cpm                                                                                                                                                                                         counts per minute DQA                                                                                                                                                                    data quality assessment DQO                                                                                                                                                                    data quality objective DCGL                                                                                                                                       derive                        d concentration guideline level DCGLW                                                                                                                    derived concentration guideline level wide area FCS                                                                                                                                                                                    Fort Calhoun Station FSS                                                                                                                                                                                         final status survey GPS                                                                                                                                                                                 Global Positioning System HTD                                                                                                                                                                       hard-to-detect IC                                                                                                                                                                                                                          insignificant contributor LBGR                                                                                                                                          lower bound of the gray region LT/FSS                                                                                                                            License Termination/Final Status Survey LTP                                                                                                                                                                                    license termination plan m                                                                                                                                                                                                                                    meter MARSSIM                                                       Multi-Agency Radiation Survey and Site Investigation Manual MDC                                                                                                                                                            minimum detectable concentration mrem/yr                                                                                                               millirem per year NaI                                                                                                                                                                                                  sodium iodide NRC                                                                                                                                                                       Nuclear Regulatory Commission OpDCGL                                                                                         operational derived concentration guideline level

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8104 NORTH OWNER CONTROLLED AREA

pCi/g                                                                                                                                                               picocuries per gram QAPP                                                                                                                                               quality assurance project plan QC                                                                                                                                                                                                       quality control ROC                                                                                                                                                                       radionuclide of concern SOF                                                                                                                                                                                 sum of fractions TEDE                                                                                                                                               total effective dose equivalent TSD                                                                                                                                                                               technical support document UBGR                                                                                                                                      upper bound of the gray region VSP                                                                                                                                                                      Visual Sample Plan

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8104 NORTH OWNER CONTROLLED AREA
: 1.                                                          EXECUTIVE 

==SUMMARY==

This final status survey (F                                   SS) release record for Survey Unit 8104, North                                                                                                 Owner Controlled Area, has been generated in accordance with procedure FCSD           -RA-LT-305,                                                           Final Status Survey Data Reporting (Reference 1) and satisfies the requirements of             Section 5.7.1 of the                                                                                                                                                                         Fort Calhoun Station Decommissioning Project License Termination Plan  (FCS           ; LTP;                                                                                                  Reference 2).
An FSS sample plan for this survey unit was developed in accordance with procedure FCSD-RA-LT-302,                                                           Final Status Survey Sample Plan                                     Development (Reference 3), the FCS                                    LTP, and with guidance from NUREG-1575, Revision 1,                                               Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM; Reference 4).
Survey Unit 8104, an open land survey unit, has a MARSSIM classification of                                                                                                                          3. A                                                              survey plan was designed based upon use of the Sign Test as the nonparametric statistical test for compliance             .
Both the Type I (           ) and Type II () decision error rates were set at 0.05. As a random sample population, 14 soil samples were acquired from the survey unit. In addition, soil scanning was performed on ten 10% of the total surface area in the survey unit. T                                                                                                                he analytical results for all  soil samples taken in Survey Unit 8104 indicate that the                                                                                                                         maximum sum of f                                                 ractions (SOF)            ,
considering the concentration of all applicable radionuclides of concern (ROC)                                   , is                         equal to 0.4783 when applying the respective operational                                     derived                         concentration guideline levels (OpDCGLs) for soil. Therefore, the null hypothesis is rejected and Survey Unit 8104is acceptable for unrestricted release. The mean SOF when applying the respective base case derived                         concentration guideline levels (                  BcDCGLs) for soilis                                                    0.0503. This SOF equates to a dose for the survey unit of 1.2572 milliremper year (mrem/yr).
: 2.                                                          SURVEY UNIT DESCRIPTION

Survey Unit 8104is an impacted Class                                                                                                                                                                       3 open land survey unit. The                         surfacearea of the survey unit is 99,971 meters (m)2.
The boundary of the survey unit and the location of the soil samples were defined using a Global Positioning System (GPS). Refer to                                           Attachment 1 of this report for              a figure depicting Survey Unit 8104.
: 3.                                                          CLASSIFICATION BASIS

Survey Unit 8104was identified in                                                                                                              the technical support document (TSD) 20-001, Historical Site Assessment for Fort Calhoun Station (Reference5                                                      ) as a Class             3 survey unit. The initial site characterization surveys were conducted between November 2019 and July 2020. The                                                                                                                                    following summarizes the results of the characterization survey for Survey Unit 8104.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8104 NORTH OWNER CONTROLLED AREA

In total, 10 surface soil sample                                                                                    s were collected in              Survey Unit 8104. All samples were analyzed by the on-site gamma spectroscopy system. Cs            -137 was detected at concentrations above minimum detectable                         concentration (MDC) in nine of the samples, at a maximum concentration of 2.49E-01 picocuries                                                              per gram (pCi/g                ). Co                        -60 was not detected at concentrations above MDC in any of the surface soil samples. A summary of the analyses for surface soil                         samples            taken during site characterization are presented in  Table 3-1.
Four surface soil             samples            were sent to  GEL Laboratories for off-                                              site analysisof the initial suite of radionuclides. A summary of the off-site analyses for Survey Unit 8104 is presented in                                                                                                                         Table 3-2.

Table 3 Statistical Quantities for Cs                                                                         -137 and Co-60 from the Characterization Survey of 8104 Surface Soil                                                                Co-60                                Cs-137
                                                                                                                                # of Samples                                                                                                                                                                                                                                                                                                                   10
                                                                                                                                      # >MDC                                                                                                                                                                                                                                                           0                                                                                                                                                                          9 Mean (pCi/g)                                                                                                                                                       5.54E-02                                          2.49E-01 Median (pCi/g)                                                                                                                                       2.07E-02                                          2.03E-01 Max (pCi/g)                                                                                                                                                               5.54E-02                                          2.49E-01 Min (pCi/g)                                                                                                                                                              0.00E+00                                                                             8.23E-02 Standard Deviation (pCi/g)                                         1.89E-02                                          5.22E-02

Table 3 Off                                                                       -site Analysis for Characterization Samples in 8104 Radionuclides                                             8100X-3-CR-GSSX-                                                                 8100X-3-CR-GSSX-                                                                 8100X-3-CR-GSSX-                                                                   8100X-3-CJ-GSSX-003                                                                              021                                                                              027                                                                               064 Am-241                                                            0.00E+00                                                                          1.20E-02                                                                         1.26E-02                                                                          4.72E-02 Sb-125                                                                                                                                                                                                                                   0.00E+00                                                                                                                                                                                                                                                                                                          1.16E-01                                                                                                                                                                                                                                                                   2.24E-02                                                                                                                                                                                                                                                                          6.77E-02 C-14                                                         0.00E+00                                                                          0.00E+00                                                                         4.79E-01                                                                          1.07E-01 Ce-144                                                                                                                                                                                                                                      7.80E-02                                                                                                                                                                                                                                                                       2.28E-01                                                                                                                                                                                                                                                                   7.07E-02                                                                                                                                                                                                                                                                     0.00E+00 Cs-134                                                           4.36E-02                                                                         0.00E+00                                                                         4.96E-02                                                                          5.11E-02 Cs-137                                                                                                                                                                                                                                      1.29E-01                                                                                                                                                                                                                                                                                                            2.05E-01                                                                                                                                                                                                                                                                                                        3.08E-01                                                                                                                                                                                                                                                                                                               1.24E-01 Co-58                                                           4.06E-02                                                                         6.82E-02                                                                        0.00E+00                                                                          0.00E+00 Co-60                                                           5.21E-03                                                                         2.29E-02                                                                         2.98E-02                                                                         0.00E+00 Cm-243                                                             8.71E-03                                                                         2.23E-02                                                                         2.50E-02                                                                          9.67E-02 Cm-244                                                             8.71E-03                                                                         2.23E-02                                                                         2.50E-02                                                                          9.67E-02 Eu-152                                                          0.00E+00                                                                          0.00E+00                                                                        0.00E+00                                                                           8.78E-02 Eu-154                                                          0.00E+00                                                                          3.91E-02                                                                         7.78E-02                                                                          1.29E-01 Eu-155                                                                                                                                                                                                                                      6.16E-02                                                                                                                                                                                                                                                                       4.19E-02                                                                                                                                                                                                                                                                   5.79E-02                                                                                                                                                                                                                                                                          1.79E-02 Fe-55                                                         3.18E+00                                                                          1.88E+00                                                                        0.00E+00                                                                          4.43E+00 Np-237                                                            1.12E-03                                                                         1.39E-03                                                                         1.89E-03                                                                          8.29E-04

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Radionuclides                              8100X-3-CR-GSSX-                                            8100X-3-CR-GSSX-                                            8100X-3-CR-GSSX-                                             8100X-3-CJ-GSSX-003                                                         021                                                         027                                                         064 Ni-59                                         1.39E-01                                                    7.57E-01                                                    7.73E-01                                                   0.00E+00 Ni-63                                                                                                                                                                                                                               4.13E-01                                                                                                                                                                                                                                                                       3.50E-01                                                                                                                                                                                                                                                              0.00E+00                                                                                                                                                                                                                                                                                                             5.00E-01 Pu-238                                          4.90E-03                                                    0.00E+00                                                    5.67E-03                                                    1.50E-02 Pu-239                                                                                                                                                                                                                                   0.00E+00                                                                                                                                                                                                                                                                                                          2.29E-02                                                                                                                                                                                                                                                                   1.16E-02                                                                                                                                                                                                                                                                          1.73E-02 Pu-240                                          0.00E+00                                                    2.29E-02                                                    1.16E-02                                                    1.73E-02 Pu-241                                                                                                                                                                                                                                   0.00E+00                                                                                                                                                                                                                                                                                                     0.00E+00                                                                                                                                                                                                                                                                                                      8.17E-01                                                                                                                                                                                                                                                                     2.17E+00 Sr-90                                         1.44E-01                                                    5.79E-02                                                   0.00E+00                                                     1.33E-01 Tc-99                                                                                                                                                                                                                                                                 0.00E+00                                                                                                                                                                                                                                                                                                     0.00E+00                                                                                                                                                                                                                                                                                                 0.00E+00                                                                                                                                                                                                                                                                                                         0.00E+00 H-3                                         0.00E+00                                                    0.00E+00                                                   0.00E+00                                                    0.00E+00 Note: Bold values indicate concentration greater than MDC. Unbolded values indicate the value                                              below MDC. All values in pCi/g.

Based upon a                                                                                                                                                 review of the historical information, the results of the   characterization survey data, and completion of a Survey Unit Classification Worksheet, the correct final classification of Survey Unit 8104was determined to be Class                                                                                                               3.
: 4.                                                         DATA QUALITY OBJECTIVES

FSS planning and design relies on a properly executed data                                                                                                                                                                                                                                                                         quality                         objective (DQO) process to ensure, through compliance with explicitly defined inputs and boundaries, that the primary objective of the survey is satisfied. The DQO process, utilized in accordance with MARSSIM, is described in the  FCS LTP. The appropriate design for a given survey was                                                                                                                                      developed using the DQO process as outlined in Appendix D of MARSSIM                                   . A summary of                         the seven steps of the DQO process are outlined in the following paragraphs.
The DQO process incorporated hypothesis testing and probabilistic sampling distributions to control decision errors during data analysis. Hypothesis testing is a process based on the scientific method that compares a baseline condition to an alternate condition. The baseline condition is technically known as the null hypothesis. Hypothesis testing rests on the premise that the null hypothesis is true and sufficient evidence must be provided to reject it in favor of the alternative hypothesis. In designing the survey plan, the underlying assumption, or null hypothesis, was that residual activity in the survey unit exceeded the release criteria  . Rejection of the null hypothesis would indicate that residual activity within the survey unit does not exceed the release criteria   .
Therefore, the survey unit would satisfy the primary objective of the FSS sample             plan.
The primary objective of the FSS sample plan is to demonstrate that the level of residual radioactivity in Survey Unit 8104 did not exceed the release criteria specified in the LTP and that the potential dose from residual radioactivity is   as low as is reasonably achievable (ALARA).

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8104 NORTH OWNER CONTROLLED AREA

TSD 21-043,Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan (Reference             6) establishe                        s the basis for an initial suite of potential ROC for decommissioning. LTP Chapter 2 provides detailed characterization data that describes the results of surveys completed of soil. Surface             samples were taken in each impacted open land survey unit and analyzed for the presence of plant-derived radionuclides. The results of surface soil characterization in the impacted area surrounding FCS indicate that there is minimal residual radioactivity in soil.
Insignificant contributors (ICs) were determined consistent with the guidance contained in Section 3.3 of NUREG            -1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance
- Characterization                                    , Survey, and Determination of Radiological Criteria                                                              (Reference             7). For soil, the ROCs were found to be Cs-137, Co-60, Eu-152, and C-14. The remaining radionuclides were designated as IC and were eliminated from further detailed evaluation.
Section 5.2.6 of the LTP states that each radionuclide specific B            cDCGL is equivalent to the level of residual radioactivity (above background levels) that could, when considered independently, result in a total effective dose equivalent (TEDE) of 25 mrem/yr to an Average Member of the Critical Group. To ensure that the summation of dose from each source term is 25 mrem/yr or less after all FSS is completed, the  BcDCGLs are reduced based on an expected, or  a priori, fraction of the 25 mrem/yr dose limit from each source term. The reduced DCGLs (i.e., OpDCGLs                                                       ) can be related to the BcDCGLs as an expected fraction of dose based on an a priori                                     assessment of what the expected dose should be based on the results of site characterization, process knowledge, and the extent of planned remediation. The OpDCGL is then used as the DCGL for the FSS design of the survey unit (e.g., calculation of surrogate DCGLs or, investigation levels). Details of the OpDCGLs derived for each dose component and the basis for the applied a priori dose fractions are provided in Section 5.2.6 of the LTP.
Multiple ROCs are known to be present at FCS           . The dose contribution from each ROC is accounted for using the SOF to ensure that the total dose from all ROC does not exceed the dose criterion. A BcDCGL that is established for the average residual radioactivity in a survey unit is equivalent to a derived concentration guideline level wide area (            DCGLW) as defined in MARSSIM.
At FCS, compliance is demonstrated through the summation of dose from seven distinct source terms (i.e., basements, soils, buried pipe,                                     embedded pipe, above-ground structures, basement fill, and groundwater) for the end state. When applied to soil, the DCGLs are expressed in units of activity per unit of mass (pCi/g).
For FCS, soil is             defined as a layer of soil beginning at the surface but extending to a depth of 1 m to allow for flexibility in compliance demonstration if contamination deeper than 0.15 m is encountered. Based on characterization data and historical information, there are no expectations

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8104 NORTH OWNER CONTROLLED AREA

of encountering a source term geometry that is comprised of a clean surface layer of soil over a contaminated subsurface soil layer. Section 6.9 of the LTP provides the exposure scenarios and modeling parameters that were used to calculate the site-                      specific soil DCGLs. The adjusted soil DCGLs for the unrestricted release of open land survey units as provided in the Section 6.16 of the LTPare                                                                                                  pre                        sented in Table 4-1. The IC dose percentage of                                                 5% was used to adjust the DCGLs in Table                                     4-1 to account for the dose from the eliminated IC radionuclides.

Table 4 Base Case DCGLs                                                                        for Soil Surface Soil                           Subsurface Radionuclide                               BcDCGL                           Soil BcDCGL (pCi/g)                               (pCi/g)
C-14                                                                                                                                                                                      5.70E+01                                                                                                                                                    9.68E+00 Co-60                                                                                                                                    3.77E+00                                                                                                                                                    2.93E+00 Cs-137                                                                                                                                                1.31E+01                                                                                                                                                    7.27E+00 Eu-152                             8.41E+00                              7.36E+00

Thereduced DCGLs, OpDCGLs, are calculated using Equation 5-1 from Chapter 5 of the LTP as shown below.

Equation 4 OpDCGL Calculation

The OpDCGLs for the unrestricted release of               soil are provided in Table                                    4-2.

Table 4 Operational DCGLs                                                                         for Soil Surface Soil                            Subsurface Radionuclide                              OpDCGL                           Soil OpDCGL (pCi/g)                                (pCi/g)
C-14                                                                                                                                                                                      1.59E+01                                                                                                                                                       2.71E+00 Co-60                                                                                                                                         1.06E-00                                                                                                                         8.21E-01 Cs-137                                                                                                                                                3.65E+00                                                                                                                                                            2.04E-00 Eu-152                                                                                                                                               2.36E+00                                                                                                                                                            2.06E-00

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8104 NORTH OWNER CONTROLLED AREA

Instrument DQOs included a verification of the ability of the survey instrument to detect the radiations of interest relative to the OpDCGL . Survey instrument response checks were required prior to issuance and after the instrument had been used. Control and accountability of survey instruments was required to assure the quality and prevent the loss of data.
As part of the DQOs applied to laboratory processes, analysis results were reported as actual calculated results. The actual                                            reported value was used as the recorded FSS result for measurement and sample values that are less than MDC. Negative values were recorded as zero                        . Results were not reported as less than MDC. Sample report summaries included unique sample identification, analytical method, radionuclide, result, uncertainty, laboratory data qualifiers, units, and the observed MDC.
In accordance with the LTP, for laboratory analysis, MDCs less than 10 % of the OpDCGL were preferable, while MDCs up to 50% of the OpDCGL were acceptable. The minimum acceptable MDC for measurements obtained using field instruments was 50% of the applicable OpDCGL.
: 5.                                                         SURVEY DESIGN

The level of effort associated with planning a survey is based on the complexity of the survey and nature of the hazards. Guidance for preparing FSS plans is provided in procedure                                     FCSD-RA-                                                                  LT-302, Final Status Survey Sample Plan                                     Development (Reference3).
The DQO process validated that Co                                    -60, Cs                                                                        -137, Eu                                                                       -152, and C-14 would be the ROCs in Survey Unit 8104 as presented in LTP Section                                                                                                                         5.2.5. As discussed in LTP Section                                                                                                                          5.2.6.2, instead of inferring the  concentrations for the hard           -to-detect (HTD) ROC                                               C-14 using a surrogate approach, 100% of all samples collected in the survey unit were sent for off             -site analysis for C-14. Table                         5-1 presents the action levels for  Survey Unit 8104sample results                                                                                                                         and are based on 50% of the OpDCGLs.

Table 5 Action Levels for Survey Unit                                                                         8104 ROC                          Action Level (pCi/g)
Co-60                                                                                                                                                                                                                                                    5.30E-01 Cs-137                                                                                                                                                                                                                                                            1.83E+00 Eu-152                                                                                                                                                                                                                                                           1.18E+00 C-14                                                                                                                                                                                                                                                                                                  7.95E+00

The Sign Test was selected as the nonparametric statistical test  to demonstrate compliance             with the release criteria. The use of the Sign Test did not require the selection or use of a background

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8104 NORTH OWNER CONTROLLED AREA

reference area, which simplified survey design and implementation. This approach was conservative since it included background Cs-137 as part of the sample set.
The number of soil samples for FSS was determined in accordance with procedureFCSD                                  -RA-LT-302 (Reference                                                                                                                                               3). The relative shift (/) for the survey unit data set is defined as shift (),
which is the upper boundary of the                                     gray                        region (UBGR), or the DCGL (SOF of 1), minus the lower bound of the gray region (LBGR)                                                                        , divided by sigma (), which is the standard deviation of the data set used for survey design. The optimal value for / should range between 1 and 3. The largest value the / can have is 3. If the calculated value of / exceeds 3, an adjusted value of 3 will be used for /. The / for                         Survey Unit 8104, based                                                                         on the data for surface soil samples collected during the                                                             characterization             of Survey Unit 8104 was calculated as follows:

Equation 5 Relative Shift
                                                                      =                (1                 0.0717           )=               25.8 0.036

As the calculated / was greater than 3, a value of 3 was used as the adjusted /. Both the Type I error (i.e.,  value                                        ) and the Type II error (i.e.,  value)                             were set at 0.05. The sample size from Table 5-5 of MARSSIM that equates to the Type I and Type II error of 0.05 for use with the Sign Test is an N value of 14.
A prospective                         power                        curve was generated using MARSSIM Power 2000, a software package developed under the sponsorship of the United States Nuclear Regulatory Commission (NRC) for implementation of the MARSSIM in support of the decommissioning license termination rule (10 CFR 20, Subpart E). The result of the MARSSIM Power 2000 computer run showed adequate power for the survey design.
Given that the survey unit is Class             3, sample locations were selected             randomly. The                                                random locations of the soil             samples were selected using Visual Sample Plan (VSP)             , in accordance with FCSD-RA-LT-302 (Reference                                                                                                                                               3). Input parameters included use of aerial photographs and the random sampling tool set with a predetermined number (14) of samples              . The random coordinates generated with VSP were integrated with a GPS to identify              sample locations in the field.               Table 5-2lists the                                     random samples collected for FSS and the corresponding GPS coordinates, based on the Nebraska State Plan            e North American Datum 1983 coordinate system                                                                                                                        .

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Table 5 Random Sample Locations Sample ID                    Northing         Easting 8104X-3-FR-GSSX-001               19408.3524      826379.4033 8104X-3-FR-GSSX-002               194717.8512     826775.9816 8104X-3-FR-GSSX-003               194880.7533     826346.3551 8104X-3-FR-GSSX-004               194609.2499     826610.7406 8104X-3-FR-GSSX-005               194772.1519     826478.5478 8104X-3-FR-GSSX-006               194850.5862     826557.0373 8104X-3-FR-GSSX-007               194741.9849     826689.2301 8104X-3-FR-GSSX-008               194904.8869     826358.7481 8104X-3-FR-GSSX-009               194633.3835     826623.1337 8104X-3-FR-GSSA-010               194796.2855     826490.9409 8104X-3-FR-GSSX-011               194705.7844     826590.0855 8104X-3-FR-GSSX-012               194868.6864     826457.8927 8104X-3-FR-GSSX-013               194597.183      826722.2783 8104X-3-FR-GSSX-014               194778.1853     826639.6578

In accordance with the sample plan, at least one judgmental sample is required from the survey unit. The number of judgmental samples that were             collected was 13, w                                        hich brings the total number of samples collected for the FSS of  Survey Unit 8104 to 27. Table                                                                                                             5-3lists the judgmental samples collected for FSS and the corresponding GPS coordinates.

Table 5 Judgmental Sample Locations Sample ID                    Northing          Easting 8104X-3-FJ-GSSX-015                194759.340      826437.989 8104X-3-FJ-GSSX-016                194871.163      826462.265 8104X-3-FJ-GSSX-017                194882.295      826465.671 8104X-3-FJ-GSSX-018                194792.295      826473.594 8104X-3-FJ-GSSX-019                194806.483      826484.165 8104X-3-FJ-GSSX-020                194597.847      826713.694 8104X-3-FJ-GSSX-021                194712.676      826778.210 8104X-3-FJ-GSSX-022                194712.549      826774.155 8104X-3-FJ-GSSX-023                194708.209      826769.680 8104X-3-FJ-GSSA-024                194720.470      826773.720 8104X-3-FJ-GSSX-025                194700.656      826754.407 8104X-3-FJ-GSSX-026                194725.686      826764.557 8104X-3-FJ-GSSX-027                194703.756      826747.071

The implementation of quality control (QC)          measures as referenced by Section 5.            6.3 of the LTP and FCSD                                                           -RA-                                                                  LT-100,                                                           Quality Assurance Project Plan for the License Termination Plan

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8104 NORTH OWNER CONTROLLED AREA

Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station (QAPP; Reference 8) includes the collection of a soil sample for split sample analysis on 5              % of the soil samplestaken in a survey unit with the locations selected at random.                                                      Four soil             samples, 8104X-3-FQ-GSSX-009, 8104X-3-FR-GSSB-010, 8104X-3-FJ-GSSB-024, and 8104X-3-FQ-GSSX-027 weredesignated                                  for split             or duplicate sample             QC analysis for the FSS of Survey Unit 8104.
Section 5.3.4 and Table 5                                                            -20 of the LTP                                                             specify that for Class                                         3 open land survey units, surface scans will be performed on a judgmental percentage of the surface area in the survey unit            . For Survey Unit 8104, 10% scan coveragewas selected                                                                                                                                              , which equals 9,997 m                                                      2.
For this Class 3 open land survey unit, the Investigation Levels for area scanning and soil sample measurement results are those levels specified in  the Table 5           -24 of the LTP and are reproduced below in Table                                     5-4.

Table 5 Investigation Levels Classification                                                       Scan Investigation Levels                                                                   Direct Investigation Levels

Class 3                                                                                                                                                                         >Operational DCGL or >MDCscan if MDCscan is greater than Operational DCGL                                                                                                                                                                                                                                                              >0.5 Operational DCGL

Table 5-5 provides a synopsis of the survey design for                                                             Survey Unit 8104.

Table 5 Synopsis of Survey Design Feature                                                           Design Criteria                                                                       Basis Survey Unit Surface Area                                                                                                                                                                                                                                                                            99,971 m2                                                                                                                                                                                                                                                                                                                                                                                                                                                       GPS Number of Random Samples                                                                               14                                                 *                         / = 3 (adjusted)
(N)
* MARSSIM Table 5.5
* Co-60:                       1.06 pCi/g
* Cs-137: 3.65 pCi/g         Operational DCGLs for surface DCGLs
* Eu-152: 2.36 pCi/g                                       soil, LTP,                                                                         Table 5-8
* C-14: 15.9 pCi/g Scan and Direct Investigation                                                                   Table 5-4                                                                                                                                                                                                                                                                                                                                                            LTP,                                                                         Table 5-24 Levels Scan Areal Coverage                                               9,997 m2, 10% areal coverage                                                             LTP, Table 5-20

Judgmental Samples                                                                                                                                                                                                                                                                                                                                                                                              1 Per Survey Design 13                                                Actual Number Obtained HTD ROC Analysis                                                                                                                                                                                                                                                                                                                                                            100% LTP, Section 5.2.6.2 27                                           Number of Samples Analyzed

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Feature                         Design Criteria                          Basis 1 duplicate and 1 split sample            LTP, Section 5.6.3 QC                          selected at random              Actual Number Obtained 4
: 6.                                                         SURVEY IMPLEMENTATION

For Survey Unit 8104, compliance with the unrestricted release criteria was demonstrated through a combination of soil scanning with a Ludlum Model 44-20 gamma detector                                                             and the sampling of soil for isotopic analysis .
A License Termination/Final Status Survey (LT/FSS) Supervisor performed a visual inspection and walk-down of the survey unit on April 28, 2022, prior to performing FSS. The purpose of the walk-down was to assess the physical condition of the survey unit, evaluate access points and travel paths, and identify potentially hazardous conditions. At the time of survey, the soil in the survey unit was dry and free of any considerable constraint for the collection of samples and scan measurements.
FSS field activities were conducted  under the FSS            sample plan and included DQOs, survey design, detailed FSS instructions, job safety analysis, and related procedures for reference. FSS field activities were projected to take 10 working days to complete. Daily briefings were conducted to discuss the expectations for job performance and to review the            safety aspects of the job. A Field Log                                                                        was used to document field activities and other information pertaining to the performance of the FSS. FSS field activities commenced on June 2, 2022, and concluded on August 2, 2022.
A total of 15 different scan                              areas were scanned using a Ludlum Model 3001 paired with a Ludlum Model 44-20 (3 x 3) sodium iodide (NaI) detector and Trimble GPS                                                                                                      unit. The background was established as the average of five one-minute static measurements, while maintaining the detector 6 from the soil. In   Survey Unit 8104, background ranged from 29,900 counts per minute (cpm) up to 32,280 cpm.
All designated scan areas were scanned using  the Model 44-20 detector operated in the rate-                                             meter mode and using audio response. The probe was positioned no more than 2 from the ground and was moved at a scan speed of approximately 0.25m per second. In accordance with                                                                                                 FCSD-RA-LT-213,                                                            Operation of the Ludlum Model 3001 & Associated Detectors                                 (Reference             9), scan MDC was sufficient to detect residual radioactivity at the action level. Complete scan results are provided in Attachment 2.
The 14 random sample locations were marked with             flags based on GPS coordinates provided.
Each soil sample consisted of approximately 1 liter of soil. The soil sample media was sifted to

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remove stones and other media larger than 1 centimeter in diameter. All soil             samples were collected, controlled, transported, stored, and transferred to the on                                                -site laboratory using the chain-of-custody process from                                                                                     FCSD-RA-LT-205,                                                           Chain-of-Custody Protocol for Site Characterization and Final Status Survey  (Reference             10), and in accordance with FCSD                                                                                   -RA-                                                                  LT-203, Sample Media Collection for Site Characterization and Final Status Survey   (            Reference 11) and FCSD                                                           -RA-                                                                  LT-204,                                                           Sample Media Preparation for Site Characterization and Final Status Survey (Reference 12).
The survey design specified that 100% of the             samples were required for the HTD ROC analysis.
In total, 27 samples were selected for HTD radionuclide analysis.
The implementation of survey specific QC measures included the collection of four             sample           s (8104X-3-FQ-GSSX-009, 8104X-3-FR-GSSB-010, 8104X-3-FJ-GSSB-024, and 8104X-3-FQ-GSSX-027) for split                                                                         or duplicate             sample analysis.
: 7.                                                         SURVEY RESULTS

All areas identified in the FSS  sample plan were scanned for elevated activity levels.             The 9,997 m2 scan requirement was achieved by scanning             15 areaswithin                                                                           accessible land. Figure 16-1 presents the scan areas within the unit. Judgmental samples did not have an Action Level, as the readings were taken to verify the readings identified in the Z  -Score analysis. Table                         7-1 provides an overview of the scan results for the gamma walkovers. Complete scan results are provided in , Figure 16-1.

Table 7 Synopsis of Scan Results

Min Scan             Max Scan                Action                Scan Scan Area               Logged                Logged                 Level             Alarms?             Judgmental Reading              Reading                (cpm)                (Y/N)                Samples (cpm)                 (cpm) 1                 19014                 35310                32988                   Y                       0 2                 20749                 38356                33029                   Y                       7 3                 19922                 34746                33623                   Y                       0 4                 19775                 34694                32844                   Y                       0 5                 20965                 35361                33848                   Y                       0 6                 19010                 34668                32721                   Y                       0 7                 19006                 35216                33397                   Y                       0 8                 18930                 36048                33582                   Y                       0 9                 19171                 34772                32578                   Y                       0 10                 28321                 35463                33684                   Y                       2

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Min Scan       Max Scan        Action         Scan Scan Area        Logged         Logged          Level       Alarms?        Judgmental Reading        Reading          (cpm)         (Y/N)          Samples (cpm)          (cpm) 11            19123          34721          32721           Y               0 12            20200          34594          32865           Y               2 13            19013          32594          31409           Y               1 14            19004          34837          33152           Y               0 15            27947          31016          30466           Y               1 QC 9           19001          33036          31963           Y               0

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For Survey Unit 8104 Grid 1                                                                                                                          , count rates ranged between  19,014 cpm and 35,310 cpm, with a mean count rate of 31,501 cpm and a standard deviation of 2,061 cpm. Figure                         7-1below presents a map of the gamma walkover for Survey Unit 8104 Grid 1                                                            .

Figure 7 Survey Unit 8104 Grid 1                                                                                                                         GPS Scan Results

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An evaluation of the Survey Unit 8104 Grid 1                                                             data set was performed to             assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-2below present                                    s the map of the +3 Z-Score measurements within Survey Unit 8104 Grid 1                                                                                                            .

Figure 7 Survey Unit 8104 Grid 1                                                                                                                         Z-Score

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For Survey Unit 8104 Grid 2                                                                                                                          , count rates ranged between  20,749 cpm and 38,356 cpm, with a mean count rate of 31,205 cpm and a standard deviation of 858 cpm. Figure 7-3below presents a map of the gamma walkover for  Survey Unit 8104 Grid 2                                                            .

Figure 7 Survey Unit 8104 Grid 2                                                                                                                         GPS Scan Results

An evaluation of Survey Unit 8104 Grid 2                                                                                                                         data set was performed to              assess the small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement.             Seven locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-4 and Figure                                                                                     7-5 below present                        maps of the +3 Z-Score measurements within Survey Unit 8104 Grid 2                                                                                                             and the selected biased sampling locations, respectively.

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Figure 7 Survey Unit 8104 Grid 2                                                                                                                         Z-Score

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Figure 7 Survey Unit 8104 Grid 2                                                                                                                         Samples (Locations 21-27)

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For Survey Unit 8104 Grid 3                                                                                                                          , count rates ranged between  19,922 cpm and 34,746 cpm, with a mean count rate of 31,617 cpm and a standard deviation of 1,622 cpm. Figure                         7-6below presents a map of the gamma walkover for Survey Unit 8104 Grid 3                                                            .

Figure 7 Survey Unit 8104 Grid 3                                                                                                                         GPS Scan Results

An evaluation of the Survey Unit 8104 Grid 3data set was performed to assess                                                             the small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement.             No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure            7-7 below presents the map of the +3 Z-                        Score measurements within             Survey Unit 8104 Grid 3.

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Figure 7 Survey Unit 8104 Grid 3                                                                                                                         Z-Score

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For Survey Unit 8104 Grid 4                                                                                                                          , count rates ranged between  19,775 cpm and 34,694 cpm, with a mean count rate of 31,093 cpm and a standard deviation of 1,967 cpm. Figure                         7-8below presents a map of the gamma walkover for Survey Unit 8104 Grid 4                                                            .

Figure 7 Survey Unit 8104 Grid 4                                                                                                                         GPS Scan Results

An evaluation of Survey Unit 8104  Grid 4                                                                                                                                     data set was performed to              assess the small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement.             No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-9 below present                        s the map of the +3 Z-Score measurements within             Survey Unit 8104 Grid 4.

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Figure 7 Survey Unit 8104 Grid 4                                                                                                                         Z-Score

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For Survey Unit 8104 Grid 5                                                                                                                          , count rates ranged between  20,965 cpm and 35,361 cpm, with a mean count rate of 31,752 cpm and a standard deviation of 1,320 cpm. Figure                         7-10 below presents a map of the gamma walkover for Survey Unit 8104 Grid 5                                    .

Figure 7 Survey Unit 8104 Grid 5                                                                                                                         GPS Scan Results

An evaluation of Surve y Unit 8104  Grid 5                                                                                                                                     data set was performed to              assess the small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement.             No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-11below present                                                            s the map of the +3 Z-                                                Score measurements within             Survey Unit 8104 Grid 5.

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Figure 7 Survey Unit 8104 Grid 5                                                                                                                         Z-Score

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For Survey Unit 8104 Grid 6, count rates ranged between 19,010 cpm and 34,668 cpm, with a mean count rate of 30,264 cpm and a standard deviation of 3,357 cpm. Figure                         7-12 below presents a map of the gamma walkover for Survey Unit 8104 Grid 6.

Figure 7 Survey Unit 8104 Grid 6 GPS Scan Results

An evaluation of the Survey Unit 8104 Grid 6 data set was performed to assess the small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement.             No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-13below presents the map of the +3 Z-                                                                                                 Score measurements within             Survey Unit 8104 Grid 6.

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Figure 7 Survey Unit 8104 Grid 6 Z-Score

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For Survey Unit 8104 Grid 7, count rates ranged between 19,006 cpm and 35,216 cpm, with a mean count rate of 30,596                                                                         cpm and a standard deviation of 3,831                                                 cpm. Figure                         7-14 below presents a map of the gamma walkover for Survey Unit 8104 Grid 7.

Figure 7 Survey Unit 8104 Grid 7 GPS Scan Results

An evaluation of the Survey Unit 8104 Grid 7 data set was performed to assess the small areas of elevated activity which exceeded three                                     standard deviations above the mean measurement.                                     No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-15below presents the map of the +3 Z-                                                                                                 Score measurements within             Survey Unit 8104 Grid 7.

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Figure 7 Survey Unit 8104 Grid 7 Z-Score

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For Survey Unit 8104 Grid 8, count rates ranged between 18,930 cpm and 36,048 cpm, with a mean count rate of 30,694 cpm and a standard deviation of 2,486 cpm. Figure                         7-16 below presents a map of the gamma walkover for Survey Unit 8104 Grid 8.

Figure 7 Survey Unit 8104 Grid 8 GPS Scan Results

An evaluation of the Survey Unit 8104 Grid 8 data set was performed to evaluate the small areas of elevated activity which exceeded three standard deviations above the mean measurement. No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-17below presents the map of the +3 Z-                                                                                                 Score measurements within             Survey Unit 8104 Grid 8.

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Figure 7 Survey Unit 8104 Grid 8 Z-Score

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For Survey Unit 8104 Grid 9, count rates ranged between 19,171 cpm and 34,772 cpm, with a mean count rate of 31,381 cpm and a standard deviation of 1,668 cpm. Figure                         7-18 below presents a map of the gamma walkover for Survey Unit 8104 Grid 9.

Figure 7 Survey Unit 8104 Grid 9 GPS Scan            Results

An evaluation of the Survey Unit 8104 Grid 9 data set was performed to assess the small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement.             No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure            7-19below presents the map of the +3 Z-                                                                                                 Score measurements within             Survey Unit 8104 Grid 9.

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Figure 7 Survey Unit 8104 Grid 9 Z-Score

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For Survey Unit 8104 Grid 10, count rates ranged between 28,321 cpm and 35,463 cpm, with a mean count rate of 31,711 cpm and a standard deviation of 1,045 cpm. Figure                         7-20 below presents a map of the gamma walkover for Survey Unit 8104 Grid 10.

Figure 7 Survey Unit 8104 Grid 10 GPS Scan Results

An evaluation of the Survey Unit 8104 Grid 10 data set was performed to evaluate                                                                                                 the small areas of elevated activity which exceeded three standard deviations above the mean measurement. Two locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-21 and Figure                                                                                                             7-22below present maps of the +3 Z-                                                                                                 Score measurements within Survey Unit 8104 Grid 10 and the selected biased sampling locations, respectively                                     .

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Figure 7 Survey Unit 8104 Grid 10 Z-Score

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Figure 7 Survey Unit 8104 Grid 10 Samples (Locations 18 & 19)

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For Survey Unit 8104 Grid 11, count rates ranged between                                                                                     19,123 cpm and 34,721 cpm, with a mean count rate of 31,379 cpm and a standard deviation of 1,754 cpm. Figure                         7-23 below presents a map of the gamma walkover for Survey Unit 8104 Grid 11.

Figure 7 Survey Unit 8104 Grid 11 GPS Scan Results

An evaluation of the Survey Unit 8104 Grid 11 data set was performed to evaluate                                                                                                 the small areas of elevated activity which exceeded three standard deviations above the mean measurement. No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-24below presents the map of the +3 Z-                                                                                                 Score measurements within             Survey Unit 8104 Grid 11.

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Figure 7 Survey Unit 8104 Grid 11 Z-Score

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For Survey Unit 8104 Grid 12, count rates ranged between                                                                                     20,200 cpm and 34,594 cpm, with a mean count rate of 31,700                                                             cpm and a standard deviation of 874 cpm. Figure 7-25below presents a map of the gamma walkover for  Survey Unit 8104 Grid 12.

Figure 7 Survey Unit 8104 Grid 12 GPS Scan Results

An evaluation of the Survey Unit 8104 Grid 12 data set was performed to evaluate                                     the small areas of elevated activity which exceeded three standard deviations above the mean measurement. Two locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-26 and Figure                                                                                                             7-27below present maps of the +3 Z-                                                                                                 Score measurements within Survey Unit 8104 Grid 12 and the selected biased sampling locations, respectively                                     .

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Figure 7 Survey Unit 8104 Grid 12 Z-Score

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Figure 7 Survey Unit 8104 Grid 12 Samples (Locations 16 & 17)

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For Survey Unit 8104 Grid 13, count rates ranged between 19,013 cpm and 32,594 cpm, with a mean count rate of 29,681 cpm and a standard deviation of 948 cpm. Figure 7-28below presents a map of the gamma walkover for  Survey Unit 8104 Grid 13.

Figure 7 Survey Unit 8104 Grid 13 GPS Scan Results

An evaluation of the Survey Unit 8104 Grid 13 data set was performed to assess                                     the small areas of elevated activity which exceeded three standard deviations above the mean measurement. One location was selected for biased sample collection based on evaluation of the gamma walkover data. The biased location represented the maximum measurements encountered within the scan area. Figure 7-29 and Figure                                                                                                             7-30below present maps of the +3 Z-                                                                                                 Score measurements within Survey Unit 8104 Grid 13 and the selected biased sampling location                                    , respectively.

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Figure 7 Survey Unit 8104 Grid 13 Z-Score

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Figure 7 Survey Unit 8104 Grid 13 Sample (Location 20)

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For Survey Unit 8104 Grid 14, count rates ranged between 19,004 cpm and 34,837 cpm, with a mean count rate of 31,889 cpm and a standard deviation of 1,832 cpm. Figure                         7-31 below presents a map of the gamma walkover for Survey Unit 8104 Grid 14.

Figure 7 Survey Unit 8104 Grid 14 GPS Scan Results

An evaluation of the Survey Unit 8104 Grid 14 data set was performed to assess                                     the small areas of elevated activity which exceeded three standard deviations above the mean measurement. No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-32below presents the map of the +3 Z-                                                                                                 Score measurements within             Survey Unit 8104 Grid 14.

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Figure 7 Survey Unit 8104 Grid 14 Z-Score

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For Survey Unit 8104 Grid 15, count rates ranged between 27,947 cpm and 31,016 cpm, with a mean count rate of 29,403 cpm and a standard deviation of 654 cpm. Figure 7-33below presents a map of the gamma walkover for  Survey Unit 8104 Grid 15.

Figure 7 Survey Unit 8104 Grid 15 GPS Scan            Results                   and Judgmental Sample (Location 15)

An evaluation of the Survey Unit 8104 Grid 15 data set was performed to assess                                     the small areas of elevated activity which exceeded three standard deviations above the mean measurement.One location was selected for biased sample collection based on evaluation of the gamma walkover data. The biased location represented the maximum measurements encountered within the scan area. Figure            7-34below presents the map of the +3 Z-                                                                                                 Score measurements within             Survey Unit 8104 Grid 15. The judgmental sample location is denoted in Figure 7-33.

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Figure 7 Survey Unit 8104 Grid 15 Z-Score

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For Survey Unit 8104 Grid 9QC, count rates ranged between 19,001 cpm and 33,036 cpm, with a mean count rate of 29,006 cpm and a standard deviation of 3,408 cpm. Figure                         7-35 below presents a map of the gamma walkover for Survey Unit 8104 Grid 9QC.

Figure 7 Survey Unit 8104 Grid 9QC GPS Scan Results

An evaluation of the Survey Unit 8104 Grid 9QC data set was performed to assess                                     the small areas of elevated activity which exceeded three standard deviations above the mean measurement. No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-36below presents the map of the +3 Z-                                                                                                 Score measurements within             Survey Unit 8104 Grid 9QC.

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Figure 7 Survey Unit 8104 Grid 9QC            Z-Score

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The on-site laboratory analyzed the 14 soil samples taken for nonparametric statistical testing using the on-site gamma spectroscopy system. A summary of the results for the 14 samples collected for nonparametric statistical testing is provided in   Table 7-2. Gamma spectroscopy results revealed that             Cs-137 waspositively identifiedin                                                                                         two random samples. No other ROCs were positively identified. GEL Laboratories analyzed the 14 random samples for             the HTD ROC C-14. C-14 was positively             detected in two                                     of the random samples. A surrogate ratio calculation was not necessary as Cs-137 was not identified in the samples. The maximum operational s                   um of fractions (OpSOF) for random samples is 0.            4783.
The basic statistics for the random sample population, as compared to the BcDCGLs, and the survey unit dose aresummarized in                                               Table 7-3.
The SOF or unity rule is the mathematical test used to evaluate compliance with radiological criteria for license termination when more than one radionuclide has been determined to be potentially present. The equation for the unity rule is:

Equation 7 Unity Rule C1                                                                                                                                                                                                                                                                                      +                                                                                                                                                                                                                                                                                                        DCGLC2+............Cn1 DCGL1           DCGL2                          n Where: C           n = concentration of radionuclide n DCGLn = DCGL of radionuclide n.

Table 7 Summary of Gamma Spectroscopy Results                                                                         and OpSOF Calculations for Samples Comprising the Statistical Sample Population

Activity          OpDCGL               Fraction Sample ID                     ROC           (pCi/g)             (pCi/g)                of             OpSOF OpDCGL

Co-60               2.66E-02    1.06E+00            2.51E-02 8104X-3-FR-GSSX-001                    Cs-137        3.64E-01           3.65E+00            9.97E-02            0.14752 Eu-152       0.00E+00            2.36E+00            0.00E+00 C-14        3.61E-01           1.59E+01            2.27E-02 Co-60        9.59E-02           1.06E+00            9.05E-02 8104X-3-FR-GSSX-002                    Cs-137        3.04E-01           3.65E+00            8.33E-02            0.22024 Eu-152        5.76E-02           2.36E+00            2.44E-02 C-14        3.51E-01           1.59E+01            2.21E-02 8104X-3-FR-GSSX-003                     Co-60        8.06E-02           1.06E+00            7.60E-02            0.32212 Cs-137        3.52E-01           3.65E+00            9.64E-02

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Activity      OpDCGL          Fraction Sample ID              ROC        (pCi/g)        (pCi/g)           of         OpSOF OpDCGL

Eu-152     3.11E-01       2.36E+00       1.32E-01 C-14     2.84E-01       1.59E+01       1.79E-02 Co-60     1.46E-01       1.06E+00       1.38E-01 8104X-3-FR-GSSX-004           Cs-137    1.07E-01       3.65E+00       2.93E-02       0.19158 Eu-152     0.00E+00       2.36E+00       0.00E+00 C-14     3.90E-01       1.59E+01       2.45E-02 Co-60               3.40E-02 1.06E+00   3.21E-02 8104X-3-FR-GSSX-005           Cs-137    2.34E-01       3.65E+00       6.41E-02       0.11644 Eu-152     0.00E+00       2.36E+00       0.00E+00 C-14     3.22E-01       1.59E+01       2.03E-02 Co-60     1.23E-01       1.06E+00       1.16E-01 8104X-3-FR-GSSX-006           Cs-137    1.58E-01       3.65E+00       4.33E-02       0.25241 Eu-152     0.00E+00       2.36E+00       0.00E+00 C-14     1.48E+00       1.59E+01       9.31E-02 Co-60     1.04E-01       1.06E+00       9.81E-02 8104X-3-FR-GSSX-007           Cs-137    1.89E-01       3.65E+00       5.18E-02       0.16316 Eu-152     0.00E+00       2.36E+00       0.00E+00 C-14     2.11E-01       1.59E+01       1.33E-02 Co-60     8.48E-03       1.06E+00       8.00E-03 8104X-3-FR-GSSX-008           Cs-137    1.84E-01       3.65E+00       5.04E-02       0.06640 Eu-152               0.00E+00 2.36E+00   0.00E+00 C-14     1.27E-01       1.59E+01       7.99E-03 Co-60     4.99E-02       1.06E+00       4.71E-02 8104X-3-FR-GSSX-009           Cs-137    1.81E-01       3.65E+00       4.96E-02       0.10767 Eu-152               0.00E+00 2.36E+00   0.00E+00 C-14     1.75E-01       1.59E+01       1.10E-02 Co-60     3.35E-02       1.06E+00       3.16E-02 Cs-137    2.06E-01       3.65E+00       5.64E-02 8104X-3-FR-GSSA-010          Eu-152               0.00E+00 2.36E+00   0.00E+00       0.10760

C-14                                                                                                                                                       3.11E-01                                                                  1.59E+01                                                                        1.96E-02

8104X-3-FR-GSSX-011           Co-60     1.09E-01       1.06E+00       1.03E-01       0.47827 Cs-137    2.57E-01       3.65E+00       7.04E-02

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Activity       OpDCGL           Fraction Sample ID                ROC         (pCi/g)         (pCi/g)            of          OpSOF OpDCGL

Eu-152               0.00E+00 2.36E+00      0.00E+00 C-14     4.85E+00        1.59E+01         3.05E-01 Co-60      1.07E-01       1.06E+00         1.01E-01 8104X-3-FR-GSSX-012             Cs-137      2.65E-01       3.65E+00         7.26E-02        0.19493 Eu-152               0.00E+00 2.36E+00      0.00E+00 C-14      3.40E-01       1.59E+01         2.14E-02 Co-60      4.00E-02       1.06E+00         3.77E-02 8104X-3-FR-GSSX-013             Cs-137     0.00E+00        3.65E+00         0.00E+00        0.05969 Eu-152               0.00E+00 2.36E+00      0.00E+00 C-14      3.49E-01       1.59E+01         2.19E-02 Co-60     0.00E+00        1.06E+00         0.00E+00 8104X-3-FR-GSSX-014             Cs-137      2.91E-01       3.65E+00         7.97E-02        0.08872 Eu-152               0.00E+00 2.36E+00      0.00E+00 C-14      1.43E-01       1.59E+01         8.99E-03 Note: Bold values indicate concentrations greater than MDC.

Table 7 Basic Statistical Properties of                                                                          Random Sample Populationand Survey Unit Dose Mean         Median          Max            Min        Std. Dev. BcDCGL            Avg        Avg Dose ROC         (pCi/g)        (pCi/g)       (pCi/g)       (pCi/g)       (pCi/g)       (pCi/g)        BcSOF        per ROC per ROC Co-60               6.84E-02 6.53E-02   1.46E-01      0.00E+00      4.63E-02      3.77E+00       1.82E-02       4.54E-01 Cs-137     2.21E-01       2.20E-01      3.64E-01      0.00E+00      9.72E-02      1.31E+01       1.69E-02       4.21E-01 Eu-152               2.63E-02 0.00E+00  3.11E-01      0.00E+00      8.34E-02      8.41E+00       3.13E-03       7.83E-02 C-14      6.92E-01       3.31E-01     4.85E+00       1.27E-01      1.24E+00      5.70E+01       1.21E-02       3.04E-01 Mean base case sum of fractions (BcSOF) = 0.0503

DOSE ASSIGNED TO SURVEY UNIT =                       1.2572 mrem/yr

The on-site laboratory analyzed the 13 judgmental soil                                     samples using the on-site gamma spectroscopy system. A summary of the analytical results for the judgmentalsoil samples is provided in Table 7-4. Gamma spectroscopy results revealed                                                 that Cs-137 was positively identified in all                                    13 judgmental samples.                                                             No other ROCs were positively identified                                                                                                                          . GEL Laboratories analyzed the 13 judgmental samples for                                                                          the HTD ROC C-14. C-14 was not detected in any of the 13 judgmental samples. The maximum OpSOF for judgmental samples is  0.286.

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Table 7 Summary of Gamma Spectroscopy Results                                                                         and OpSOF Calculations for Judgmental Samples Measured     OpDCGL        Fraction Sample ID           ROC      Activity                     of       OpSOF (pCi/g)      (pCi/g)     OpDCGL Co-60   1.13E-01     1.06E+00      1.07E-01 8104X-3-FJ-GSSX-015      Cs-137   1.64E-01     3.65E+00      4.49E-02    0.16814 Eu-152   0.00E+00     2.36E+00     0.00E+00 C-14    2.64E-01     1.59E+01      1.66E-02 Co-60   8.89E-02     1.06E+00      8.39E-02 8104X-3-FJ-GSSX-016      Cs-137   1.56E-01     3.65E+00      4.27E-02    0.23000 Eu-152   2.44E-01     2.36E+00      1.03E-01 C-14    0.00E+00     1.59E+01     0.00E+00 Co-60   6.22E-02     1.06E+00      5.87E-02 8104X-3-FJ-GSSX-017      Cs-137   1.14E-01     3.65E+00      3.12E-02    0.10079 Eu-152   0.00E+00     2.36E+00     0.00E+00 C-14    1.73E-01     1.59E+01      1.09E-02 Co-60   1.05E-01     1.06E+00      9.91E-02 8104X-3-FJ-GSSX-018      Cs-137   1.90E-01     3.65E+00      5.21E-02    0.15111 Eu-152   0.00E+00     2.36E+00     0.00E+00 C-14    0.00E+00     1.59E+01     0.00E+00 Co-60   2.13E-02     1.06E+00      2.01E-02 8104X-3-FJ-GSSX-019      Cs-137   1.74E-01     3.65E+00      4.77E-02    0.06777 Eu-152   0.00E+00     2.36E+00     0.00E+00 C-14    0.00E+00     1.59E+01     0.00E+00 Co-60   7.59E-02     1.06E+00      7.16E-02 8104X-3-FJ-GSSX-020      Cs-137   1.41E-01     3.65E+00      3.86E-02    0.11023 Eu-152   0.00E+00     2.36E+00     0.00E+00 C-14    0.00E+00     1.59E+01     0.00E+00 Co-60   1.04E-01     1.06E+00      9.81E-02 8104X-3-FJ-GSSX-021      Cs-137   1.72E-01     3.65E+00      4.71E-02    0.14524 Eu-152   0.00E+00     2.36E+00     0.00E+00 C-14    0.00E+00     1.59E+01     0.00E+00 Co-60   6.99E-02     1.06E+00      6.59E-02 8104X-3-FJ-GSSX-022      Cs-137   1.60E-01     3.65E+00      4.38E-02    0.10978 Eu-152   0.00E+00     2.36E+00     0.00E+00 C-14    0.00E+00     1.59E+01     0.00E+00 8104X-3-FJ-GSSX-023       Co-60   0.00E+00     1.06E+00     0.00E+00     0.03370

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Measured        OpDCGL         Fraction Sample ID              ROC        Activity                         of        OpSOF (pCi/g)        (pCi/g)      OpDCGL Cs-137    1.23E-01       3.65E+00       3.37E-02 Eu-152    0.00E+00       2.36E+00       0.00E+00 C-14     0.00E+00       1.59E+01       0.00E+00 Co-60     1.42E-01       1.06E+00       1.34E-01 8104X-3-FJ-GSSA-024          Cs-137    1.93E-01       3.65E+00       5.29E-02      0.28599 Eu-152    2.34E-01       2.36E+00       9.92E-02 C-14     0.00E+00       1.59E+01       0.00E+00 Co-60     6.96E-02       1.06E+00       6.57E-02 8104X-3-FJ-GSSX-025          Cs-137    1.84E-01       3.65E+00       5.04E-02      0.11607 Eu-152    0.00E+00       2.36E+00       0.00E+00 C-14     0.00E+00       1.59E+01       0.00E+00 Co-60     0.00E+00       1.06E+00       0.00E+00 8104X-3-FJ-GSSX-026          Cs-137    2.27E-01       3.65E+00       6.22E-02      0.07206 Eu-152    2.33E-02       2.36E+00       9.87E-03 C-14     0.00E+00       1.59E+01       0.00E+00 Co-60     2.31E-02       1.06E+00       2.18E-02 8104X-3-FJ-GSSX-027          Cs-137    1.52E-01       3.65E+00       4.16E-02      0.06344 Eu-152    0.00E+00       2.36E+00       0.00E+00 C-14     0.00E+00       1.59E+01       0.00E+00 Note: Bold values indicate concentrations greater than MDC.

The implementation of survey specific QC measures included the collection of four             sample           s (8104X-3-FQ-GSSX-009, 8104X-3-FR-GSSB-010, 8104X-3-FJ-GSSB-024, and 8104X-3-FQ-GSSX-027) for split                                                                         or duplicate             sample analysis. The on-site laboratory analyzed the QC samples using the on-                     site gamma spectroscopy system. A summary of the analytical results for the QC samples is provided in Table                                                          7-5. Gamma spectroscopy results revealed                                                 that Cs-137 was not identified in             any of the four QC samples. No other ROCs were positively identified in any QC sample. The maximum OpSOF for QC samples is 0.1333.

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Table 7 Summary of Gamma Spectroscopy Results                                                                         and OpSOF Calculations for QC Samples

Sample ID               ROC            Activity        OpDCGL                 Fraction of               OpSOF (pCi/g)           (pCi/g)               OpDCGL

Co-60         6.38E-02          1.06E+00                 0.06019 8104X-3-FQ-              Cs-137         2.67E-01          3.65E+00                 0.07315                0.13334 GSSX-009               Eu-152         0.00E+00          2.36E+00                 0.00000 C-14          0.00E+00          1.59E+01                 0.00000 Co-60         7.62E-03          1.06E+00                 0.00719 8104X-3-FR-              Cs-137         1.86E-01          3.65E+00                 0.05096                0.09137 GSSB-010               Eu-152         7.84E-02          2.36E+00                 0.03322 C-14          0.00E+00          1.59E+01                 0.00000 Co-60         0.00E+00          1.06E+00                 0.00000 8104X-3-FJ-             Cs-137         1.90E-01          3.65E+00                 0.05205                0.05205 GSSB-024               Eu-152         0.00E+00          2.36E+00                 0.00000 C-14          0.00E+00          1.59E+01                 0.00000 Co-60         3.84E-02          1.06E+00                 0.03623 8104X-3-FQ-              Cs-137         1.21E-01          3.65E+00                 0.03315                0.06938 GSSX-027               Eu-152         0.00E+00          2.36E+00                 0.00000 C-14          0.00E+00          1.59E+01                 0.00000 Note: Bold values indicate concentrations greater than MDC.
: 8.                                                          QUALITY CONTROL

The on-site laboratory processed four            split             and duplicate sample            s (8104X-3-FQ-GSSX-009, 8104X-3-FR-GSSB-010, 8104X-3-FJ-GSSB-024, and 8104X-3-FQ-GSSX-027) using gamma spectroscopy analysis. The data was evaluated using  acceptance criteria specified in             NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual             (Reference             13) as detailed by Section 5.6.3.2 of the LTP. There was acceptable agreement between  standard and comparison sample resultsin all cases                                          . Refer to Attachment                         4 for data and QCanalysis results.
: 9.                                                          INVESTIGATIONS AND RESULTS

During the FSS of Survey Unit 8104, areaswith a                                                                                                                                                                                                              +3 sigma/alarms were investigated.             Thirteen judgmental samples were collected for investigation, all with radiological concentrations below the OpDCGL.

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: 10.                              REMEDIATION AND RESULTS

No radiological remedial action as described by MARSSIM Section 5.4 was performed  in Survey Unit 8104 prior to or as a result of the FSS. Chapter 4 of the LTP                                                                                                                           determined that remediation beyond that required to meet the release criteria is unnecessary and the remaining residual radioactivity in soil was ALARA.
: 11.                              CHANGES FROM THE FINAL STATUS SURVEY PLAN

There were no addendums to the FSS plan.
: 12.                              DATA QUALITY ASSESSMENT

The DQO sample design and data were reviewed in accordance with  FCSD-RA-                                                                  LT-304,                                                           Final Status Survey Data Assessment (Reference 14) for completeness and consistency.
Documentation was complete and legible. Surveys and the collection of samples            were consistent with the DQOs and were sufficient to ensure that the survey unit was properly designated as Class
: 3. The survey design had adequate power as indicated by the retrospective power                        curve (see ,Figure 16-4).
The measurement results indicated that all sampleswere less than a SOF of                                                     1 when compared to the OpDCGLs.
Although MARSSIM states that the Sign Test need not be performed in the instance that no measurements surpass the OpDCGL, the test was conducted to demonstrate coherence to the statistical principles of the DQO process. The Sign Test was performed on the data and compared to the original assumptions of the DQOs. The evaluation of the Sign Test results clearly demonstrates that Survey Unit 8104 passes the unrestricted release criteria, thus, the null hypothesis is rejected. The results of the Sign Test are presented in Attachment              3.
The preliminary data review consisted of calculating basic statistical quantities (e.g., mean, median, standard deviation). All data was considered valid including negative values, zeros, and values reported below the MDC. The mean and median values for each ROC were well below the respective OpDCGLs. Also, the retrospective power curve shows that  enough samples were collected to achieve the desired power  ; therefore, Survey Unit 8104 meets the unrestricted release criteria with adequate power as required by the DQOs.
The mean of all identified isotopes is less than the Consultation Triggers for Residential Soil Concentration depicted in Table H.1 of NUREG 1757, Vol.1, Rev. 2 (Memorandum of Understanding Table 1). The full table is included in Attachment 5 of this release record.

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The data for Cs-137 is                                                                                     presented graphically through a                                                                                     frequency plot and quantile plot. All graphical presentations are provided in Attachment                                     6.
: 13.                              ANOMALIES

No anomalies were observed during the performance or analyses of the survey.
: 14.                              CONCLUSION

Survey Unit 8104has met the DQOs of the FSS plan. The ALARA criteria as specified in Chapter 4 of the LTP were achieved. The elevated measurement comparison for soils was not applicable and remediation was not required.
All identified ROCs were used for statistical testing to determine the adequacy of              Survey Unit 8104 for FSS. Evaluation of the data shows that none of the random ROC concentration values exceeds the OpDCGLs; therefore, in accordance with LTP Section 5 .2.6, the survey unit meets the release criteria.
The sample data passed the Sign Test. The null hypothesis was rejected. The  retrospective power curve showed that adequate power was achieved.             Survey Unit 8104 is properly classified as Class 3.
The dose contribution from soil in Survey Unit 8104 is                                                                                     1.2572 mrem/yr TEDE, based on the average concentration of the ROCs in samples used for nonparametric statistical             testing.
Survey Unit 8104is acceptable                                                                                                                                  for unrestricted release.
: 15.                              REFERENCES
: 1.                                                                                                                                   FCSD-RA-LT-305, Final Status Survey Data Reporting
: 2.                                                                                                                                   Fort Calhoun Station Decommissioning Project License Termination Plan
: 3.                                                                                                                                   FCSD-RA-LT-302, Final Status Survey Sample Plan Development
: 4.                                                                                                                                   NUREG-1575, Revision 1,                                   Multi-Agency Radiation Survey and Site Investigation Manual
: 5.                                                                                                                                   TSD 20-001, Historical Site Assessment for Fort Calhoun Station
: 6.                                                                                                                                   TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan
: 7.                                                                                                                                   NUREG-1757, Volume 2, Revision 2,                                    Consolidated Decommissioning Guidance -
Characterization, Survey, and Determination of Radiological Criteria  

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: 8.                                                                                                                                   FCSD-RA-LT-100,                                                           Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station
: 9.                                                                                                                                   FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors
: 10.                                                                                                                                   FCSD-RA-LT-205,                                                           Chain-of-Custody Protocol for Site Characterization and Final Status Survey
: 11.                                                                                                                                   FCSD-RA-LT-203,                                                           Sample Media Collection for Site Characterization and Final Status Survey
: 12.                                                                                                                                   FCSD-RA-LT-204,                                                           Sample Media Preparation for Site Characterization and Final Status Survey
: 13.                                                                                                                                   NUREG-1576,                                   Multi-Agency Radiological Laboratory Analytical Protocols Manual
: 14.                                                                                                                                   FCSD-RA-LT-304,                                                           Final Status Survey Data Assessment
: 16.                              ATTACHMENTS

Attachment 1 - Figure Attachment 2 - Scan Data Attachment 3 - Sign Test Attachment 4 - Quality Control Assessment Attachment 5 - Consultation Triggers for Residential Soil Concentrations Attachment 6 - Graphical Presentations

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ATTACHMENT 1 - FIGURES

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Figure 16 Survey Unit 8104 Scan Locations Map

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ATTACHMENT 2 - SCAN DATA

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Table 16 Survey Unit 8104 Complete Scan Data Min        Max        Avg Detector    Detector                 Survey                 Scan       Scan      Back-     Action     Scan Type          ID       M3001 ID      Unit     Location    Logged     Logged     ground     Level   Alarms?
Result     Result     (cpm)      (cpm)     (Y/N)
(cpm)     (cpm) 44-20     PR404738     25021210      8104         1        19014     35310     31500.85    32988       Y 44-20     PR397203     25021217      8104         2        20749     38356      31480      33029       Y 44-20     PR403795     25021219      8104         3        19922     34746      31616.5    33623       Y 44-20     PR404738     25021210      8104         4        19775     34694      31300      32844       Y 44-20     PR404738     25021210      8104         5        20965     35361      32280      33848       Y 44-20     PR404738     25021210      8104         6        19010     34668      31180      32721       Y 44-20     PR404738     25021210      8104         7        19006     35216      31840      33397       Y 44-20     PR404738     25021210      8104         8        18930     36048      32020      33582       Y 44-20     PR403795     25021219      8104         9        19171     34772      31040      32578       Y 44-20     PR403795     25021219      8104        10        28321     35463      32120      33684       Y 44-20     PR403795     25021219      8104        11        19123     34721      31180      32721       Y 44-20     PR403795     25021219      8104        12        20200     34594      31699.6    32865       Y 44-20     PR403795     25021219      8104        13        19013     32594      29900      31409       Y 44-20     PR403795     25021219      8104        14        19004     34837      31600      33152       Y 44-20     PR403795     25021219      8104        15        27947     31016      29980      30466       Y 44-20     PR397732     25021209      8104        16                  33300 44-20     PR397732     25021209      8104        17                  34100 44-20     PR397732     25021209      8104        18                  33700 44-20     PR397732     25021209      8104        19                  32800 44-20     PR397732     25021209      8104        20                  33400 44-20     PR397732     25021209      8104        21                  34100 44-20     PR397732     25021209      8104        22                  33900 44-20     PR397732     25021209      8104        23                  32800 44-20     PR397732     25021209      8104        24                  34500 44-20     PR397732     25021209      8104        25                  35200 44-20     PR397732     25021209      8104        26                  34300 44-20     PR397732     25021209      8104        27                  32900 44-20     PR404738     25021210      8104       QC 9       19001     33036      30440      31963       Y Areas above            three (        3) standard deviations were scanned for verification of original scans prior to judgmental sample collection.

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ATTACHMENT 3 - SIGN TEST

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Table 16 Survey Unit                                                                        8104 Sign Test
                                     #            SOF           1-Ws            Sign (Ws) 1         0.14752           0.85            +1 2         0.22024           0.78            +1 3         0.32212           0.68            +1 4         0.19158           0.81            +1 5         0.11644           0.88            +1 6         0.25241           0.75            +1 7         0.16316           0.84            +1 8         0.06640           0.93            +1 9         0.10767           0.89            +1 10         0.10760           0.89            +1 11         0.47827           0.52            +1 12         0.19493           0.81            +1 13         0.05969           0.94            +1 14         0.08872           0.91            +1 Number of positive differences (S+)                           14

Critical Value           10

Survey Unit                Meets the Acceptance Criteria

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ATTACHMENT 4 - QUALITY CONTROL ASSESSMENT

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Table 16 Survey Unit 8104                    QC Assessment 6XUYH\\ $UHM                                                            6XUYH\\ 8QLW                                          6XUYH\\ 8QLW 1MPH                                                                                                                                                      1RUWK  2RQHU  &RQWUROOHG  $UHM

Sample Plan #:                                                          8104

Sample

== Description:==
Comparison of split samples collected from surface soil samples from location #24 and #27 were analyzed using gamma spectroscopy by on-site HPGe System.

Standard ID                      Activity Value             Standard Error             Activity Value               Standard                               $EVROXWH              53'                 Trending               $FFHSWMEOH" (Standard)                                         (Comparison)                   Error                               'LIIHUHQFH                               Assessment?
8104X-3-FJ-GSSA-024                                                                  1.93E-01                                                                                4.90E-02                                                                                       1.90E-01                                                                 4.60E-02                                   1.92E-01                                     3.00E-03                                                                 N/A                                                                                                                              Y                                                                                                                                                               Y 8104X-3-FJ-GSSX-027                                                                  1.52E-01                                                                                5.06E-02                                                                                       1.21E-01                                                                 3.78E-02                                   1.37E-01                                     3.10E-02                                                                 N/A                                                                                                                              Y                                                                                                                                                               YGuidanc e from  Sec t ion C.4.2.2 of MAR LAP

UBGR (Cs-137 OpDCGL) = 3.65 pCi /g LBGR (Mean Cs-137Activity) = 0.2209 pCi/g Wi d th  o f th e Gra y Regi o n  ( ) = 3.4291 p Ci /g M a x Sta n d a rd  Un certa i n ty (&#xb5;M R) =  /10 = 0.3429 p Ci /g Comments/Corrective Actions:  Both samples reported Cs-137 as a detect. There was acceptable agreement between the sample results. No further                                                                                                                                 Max Relative Standard Uncertainty (MR) = 0.0939 action is necessary.                                                                                                                                  Avera ge Co n cen tra ti o n  o f th e two  mea su red  resu l ts < UBGR:
Warning Limit = 2.83 &#xb5;MR = 0.9704 pCi/g Control Limit = 4.24 &#xb5;MR = 1.454 pCi/g Avera ge Co n cen tra ti o n  o f th e two  mea su red  resu l ts > UBGR:
Warning Limit = 2.83 MR x 100% = 26.59%
Control Limit = 4.24 MR x 100% = 39.83%

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ATTACHMENT 5 - CONSULTATION TRIGGERS FOR RESIDENTIAL SOIL CONCENTRATION

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ATTACHMENT 6 - GRAPHICAL PRESENTATIONS

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Figure 16 Quantile Plot for Cs                                                -137 Concentration

Quantile Plot For Cs                                                                                      -137

4.00E-01

3.50E-01

3.00E-01

2.50E-01

2.00E-01

1.50E-01

1.00E-01

5.00E-02

0.00E+00 0%                                                                                              10%                                                                                    20%                                                                                    30%                                                                                    40%                                                                                    50%                                                                                    60%                                                                                    70%                                                                                    80%                                                                                    90%                                                                          100%

PERCENTAGE

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Figure 16 Histogram for Cs                                                -137 Concentration

Frequency Plot For Cs                                                                                                                                           -137

10 9
8 7
6 5
4 3
2 1
0 6.07E-02                                                                                                                                                1.21E-01                                                                                                                                                1.82E-01                                                                                                                                                2.43E-01                                                                                                                                                3.03E-01                                                                                                                                                3.64E-01

UPPER END VALUE (PCI/G)

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Figure 16 RetrospectivePower Curve for                                                                                  Survey Unit 8104

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FORT CALHOUN STATION FINAL STATUS SURVEY RELEASE RECORD

SURVEY UNIT 8105 NORTH OWNER CONTROLLED AREA

REVISION 0

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PREPARED BY / DATE:
L. Coffey, LT/FSS Specialist

REVIEWED BY / DATE:
M. Uz, LT/FSS Specialist

REVIEWED BY /     DATE:
A. Barker Regulatory Assurance & Emergency Planning Manager

REVIEWED BY / DATE:
D. Whisler Manager Radiation Protection & Chemistry

APPROVED BY / DATE:
B. Bishop, LT/FSS Manager

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TABLE OF CONTENTS
: 1.                                                EXECUTIVE 

==SUMMARY==
 ................................................................................................................................. 8
: 2.                                                 SURVEY UNIT DESCRIPTION ....................................................................................................................... 8
: 3.                                                CLASSIFICATION BASIS ................................................................................................................................. 8
: 4.                                                DATA QUALITY OBJECTIVES .................................................................................................................... 10
: 5.                                                 SURVEY DESIGN ............................................................................................................................................. 13
: 6.                                                SURVEY IMPLEMENTATION ...................................................................................................................... 17
: 7.                                                 SURVEY RESULTS .......................................................................................................................................... 18
: 8.                                                 QUALITY CONTROL ...................................................................................................................................... 58
: 9.                                                 INVESTIGATIONS AND RESULTS .............................................................................................................. 59
: 10.                             REMEDIATION AND RESULTS ................................................................................................................... 59
: 11.                             CHANGES FROM THE FINAL STATUS SURVEY PLAN ........................................................................ 59
: 12.                             DATA QUALITY ASSESSMENT ................................................................................................................... 59
: 13.                             ANOMALIES ..................................................................................................................................................... 60
: 14.                             CONCLUSION ..................................................................................................................................................          60
: 15.                             REFERENCES................................................................................................................................................... 60
: 16.                             ATTACHMENTS ..............................................................................................................................................          61

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8105 NORTH OWNER CONTROLLED AREA

LIST OF TABLES

Table 3 Statistical Quantities for Cs-137 and Co-60 from the Characterization Survey of 8105 .................... 9 Table 3 Off-site Analysis for Characterization Samples in 8105 ........................................................................ 9 Table 4 Base Case DCGLs for Soil ..................................................................................................................... 12 Table 4 Operational DCGLs for Soil .................................................................................................................. 13 Table 5 Action Levels for Survey Unit 8105 ....................................................................................................... 14 Table 5 Random Sample Locations .................................................................................................................... 15 Table 5 Judgmental Sample Locations ............................................................................................................... 15 Table 5 Investigation Levels ................................................................................................................................         16 Table 5 Synopsis of Survey Design ...................................................................................................................... 17 Table 7 Synopsis of Scan Results ........................................................................................................................ 19 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Samples Comprising the Statistical Sample Population ........................................................................................................................... 52 Table 7 Basic Statistical Properties of Random Sample Population and Survey Unit Dose   .......................... 54 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples .... 55 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples   .................. 58 Table 16 Survey Unit 8105 Complete Scan Data ............................................................................................... 66 Table 16 Survey Unit 8105 Sign Test .................................................................................................................. 69 Table 16 Survey Unit 8105 QC Assessment ....................................................................................................... 71

LIST OF FIGURES

Figure 7 Survey Unit 8105 GW                  -1 GPS Scan Results ......................................................................................... 20 Figure 7 Survey Unit 8105 GW                  -1 Z-Score and Sample Map (Location 16)  ....................................................         21 Figure 7 Survey Unit 8105 GW                  -2 GPS Scan Results ......................................................................................... 22 Figure 7 Survey Unit 8105 GW                  -2 Z-Score Map ................................................................................................         23 Figure 7 Survey Unit 8105 GW                  -3 GPS Scan Results ......................................................................................... 24 Figure 7 Survey Unit 8105 GW                  -3 Z-Score Map ................................................................................................         25 Figure 7 Survey Unit 8105 GW                  -4 GPS Scan Results ......................................................................................... 26 Figure 7 Survey Unit 8105 GW                  -4 Z-Score and Sample Map (Locations 30 -34) ............................................. 27 Figure 7 Survey Unit 8105 GW                  -5 GPS Scan Results ......................................................................................... 28 Figure 7 Survey Unit 8105 GW                    -5 Z-                          Score Map ..............................................................................................         29 Figure 7 Survey Unit 8105 GW                    -6 GPS Scan Results ....................................................................................... 30 Figure 7 Survey Unit 8105 GW                    -6 Z-                         Score and Sample Map (Locations 35-36) ........................................... 31 Figure 7 Survey Unit 8105 GW                    -7 GPS Scan Results ....................................................................................... 32 Figure 7 Survey Unit 8105 GW                    -7 Z-                          Score Map ..............................................................................................         33 Figure 7 Survey Unit 8105 GW                    -8 GPS Scan Results ....................................................................................... 34 Figure 7 Survey Unit 8105 GW                    -8 Z-                          Score Map ..............................................................................................         35 Figure 7 Survey Unit 8105 GW                    -9 GPS Scan Results ....................................................................................... 36 Figure 7 Survey Unit 8105 GW                    -9 Z-                          Score Map and Sample (Location 37)  .................................................. 37 Figure 7 Survey Unit 8105 GW                    -10 GPS Scan Results ..................................................................................... 38 Figure 7 Survey Unit 8105 GW                    -10 Z-Score Map ............................................................................................ 39 Figure 7 Survey Unit 8105 GW                    -11 GPS Scan Results ..................................................................................... 40

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8105 NORTH OWNER CONTROLLED AREA

Figure 7 Survey Unit 8105 GW                    -11 Z-Score and Sample Map (Locations 17-27) ......................................... 41 Figure 7 Survey Unit 8105 GW                    -12 GPS Scan Results ..................................................................................... 42 Figure 7 Survey Unit 8105 GW                   -12 Z-Score Map ............................................................................................ 43 Figure 7 Survey Unit 8105 GW                    -13 GPS Scan Results ..................................................................................... 44 Figure 7 Survey Unit 8105 GW                    -13 Z-Score Map ............................................................................................ 45 Figure 7 Survey Unit 8105 GW                    -14 GPS Scan Results ..................................................................................... 46 Figure 7 Survey Unit 8105 GW                    -14 Z-Score and Sample Map (Locations 28-29) ......................................... 47 Figure 7 Survey Unit 8105 GW                    -15 GPS Scan Results and Sample (Location 15) ........................................ 48 Figure 7 Survey Unit 8105 GW                    -15 Z-Score Map ............................................................................................ 49 Figure 7 Survey Unit 8105 GW                    -14Q GPS Scan Results .................................................................................. 50 Figure 7 Survey Unit 8105 GW                    -14Q Z-Score Map .......................................................................................... 51 Figure 16 Survey Unit 8105 Scan and Judgmental Locations Maps  ................................................................         63 Figure 16 Scan and Random Locations Map ..................................................................................................... 64 Figure 16 Quantile Plot for Cs-137 Concentration ............................................................................................ 75 Figure 16 Histogram for Cs-137 Concentration .................................................................................................         76 Figure 16 Retrospective Power Curve for Survey Unit 8105  ............................................................................ 77

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LIST OF ABBREVIATIONS delta
/                                                                                                                                                                                                     relative shift sigma ALARA                                                                                                               as low as is reasonably achievable BcDCGL                                                                                            base case derived concentration guideline level BcSOF                                                                                                                                      base case sum of fractions cpm                                                                                                                                                                                         counts per minute DQA                                                                                                                                                                    data quality assessment DQO                                                                                                                                                                    data quality objective DCGL                                                                                                                                       derived concentration guideline level DCGLW                                                                                                                    derived concentration guideline level wide area FCS                                                                                                                                                                                    Fort Calhoun Station FSS                                                                                                                                                                                         final status survey GPS                                                                                                                                                                                 Global Positioning System HTD                                                                                                                                                                       hard-to-detect IC                                                                                                                                                                                                                          insignificant contributor LBGR                                                                                                                                          lower bound of the gray region LT/FSS                                                                                                                            License Termination/Final Status Survey LTP                                                                                                                                                                                    license termination plan m                                                                                                                                                                                                                                    meter MARSSIM                                                       Multi-Agency Radiation Survey and Site Investigation Manual MDC                                                                                                                                                            minimum detectable concentration mrem/yr                                                                                                               millirem per year NaI                                                                                                                                                                                                  sodium iodide NRC                                                                                                                                                                       Nuclear Regulatory Commission OpDCGL                                                                                         operational derived concentration guideline level

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pCi/g                                                                                                                                                               picocuries per gram QAPP                                                                                                                                               quality assurance project plan QC                                                                                                                                                                                                       quality control ROC                                                                                                                                                                       radionuclides of concern SOF                                                                                                                                                                                 sum of fractions TEDE                                                                                                                                               total effective dose equivalent TSD                                                                                                                                                                               technical support document UBGR                                                                                                                                      upper bound of the gray region VSP                                                                                                                                                                      Visual Sample Plan

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8105 NORTH OWNER CONTROLLED AREA
: 1.                                                          EXECUTIVE 

==SUMMARY==

This final status survey (FSS) release record for Survey Unit 8105, North                                                                                                 Owner Controlled Area, has been generated in accordance with procedure FCSD           -RA-LT-305,                                                           Final Status Survey Data Reporting (Reference 1) and satisfies the requirements of Section 5.7.1 of the                                                                         Fort Calhoun Station Decommissioning Project License Termination Plan  (FCS           ; LTP; Reference                                                                                                              2).
An FSS sample plan for this survey unit was developed in accordance with procedure FCSD-RA-LT-302,                                                           Final Status Survey Sample Plan                                     Development (Reference 3), the FCS                                    LTP, and with guidance from NUREG-1575, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM; Reference 4).
Survey Unit 8105, an open land survey unit, has a MARSSIM classification of                                                                                                                          3. A                                                              survey plan was designed based upon use of the Sign Test as the nonparametric statistical test for compliance             .
Both the Type I (           ) and Type II () decision error rates were set at 0.05. As a random sample population, 14 soil samples were acquired from the survey unit. In addition, soil scanning was performed on 10% of the total surface area in the survey unit. T                           he analytical results for all  soil samples, both random and judgmental, taken in Survey Unit 8105 indicate that the                                                                                                                                                                                          maximumsum of fractions (SOF), considering the concentration of all applicable radionuclides of concern (ROC), is                         equal to 0.2475 when applying the respective operational derived concentration guideline levels (OpDCGL           s) for soil. Therefore, the null hypothesis is rejected and Survey Unit 8105 is acceptable for unrestricted release.                                                                                                             The mean SOF when applying the respective base case derived concentration guideline levels (BcDCGLs) for soil                                       is 0.0388. This SOF equates to a dose for the survey unit of 0.9697 milliremper year (mrem/yr).
: 2.                                                          SURVEY UNIT DESCRIPTION

Survey Unit 8105is an impacted Class                                                                                                                                                                       3 open land survey unit. The                         surfacearea of the survey unit is 99,994 meters (m)2.
The boundary of the survey unit and the location of the soil samples were defined using a Global Positioning System (GPS). Refer to Attachment 1 of this report for                                            a figure depicting Survey Unit 8105.
: 3.                                                          CLASSIFICATION BASIS

Survey Unit 8105was identified in                                                                                                              the technical support document (TSD) 20-001, Historical Site Assessment for Fort Calhoun Station  (HSA) (Reference 5) as a Class                                                 3 survey unit. The initial site characterization surveys were conducted between November 2019 and July 2020. The following summarizes                                                             the results of the characterization survey for Survey Unit 8105.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8105 NORTH OWNER CONTROLLED AREA

In total, 15 surface soil samples were collected in Survey Unit 8105. All samples from                                                                                                                                      Survey Unit 8105 were analyzed by the on-site gamma spectroscopy system. Cs-                   137 was detected at concentrations above minimum detectable concentration (MDC) in seven                                     of the samples, at a maximum concentration of 2.73E-01 picocuries per gram (pCi/g                ). Co                        -60 was not detected at concentrations above MDC in any of the surface soil samples. A summary of the analyses for surface soil samples taken during site characterization arepresented in Table                                                                       3-1.
Two surface soil samples were sent to GEL Laboratories for off             -site analysis of the  initial suite of radionuclides. A summary of the off-site analyses of  Survey Unit 8105 is presented in                                                                                                                         Table 3-2.

Table 3 Statistical Quantities for Cs                                                                         -137 and Co-60 from the Characterization Survey of 8105 Surface Soil                                Co-60                Cs-137
                                                                       # of Samples                                                                                                                                                                                                                                                                                                                   15
                                                                          # >MDC                                                                                                                                                                                                                                                           0                                                                                                                                                                          7 Mean (pCi/g)                                                                                                                                                       2.16E-02                                          1.73E-01 Median (pCi/g)                                                                                                                                       1.73E-03                                          1.82E-01 Max (pCi/g)                                                                                                                                                               1.15E-01                                          2.73E-01 Min (pCi/g)                                                                                                                                                              0.00E+00                                                                             2.21E-02 Standard Deviation (pCi/g)                                         3.17E-02                                          7.05E-02

Table 3 Off                                                                       -site Analysis for Characterization Samples  in 8105

Radionuclides                          8100X-3-CJ              -GSSX-058                          8100X-3-CR-GSSX-029 Am-241                                         2.72E-02                                                   0.00E+00 Sb-125                                        2.70E-02                                                   1.74E-03 C-14                                        1.37E-01                                                   0.00E+00 Ce-144                                         0.00E+00                                                   0.00E+00 Cs-134                                        1.87E-02                                                   9.19E-02 Cs-137                                        1.80E-01                                                   4.96E-01 Co-57                                        0.00E+00                                                   5.95E-02 Co-58                                        1.75E-02                                                   6.93E-02 Co-60                                        0.00E+00                                                   0.00E+00 Cm-242                                         0.00E+00                                                   0.00E+00 Cm-243/244                                          3.58E-02                                                   1.20E-02 Eu-152                                         1.11E-03                                                   2.82E-01 Eu-154                                         5.66E-03                                                   7.35E-03 Eu-155                                         1.90E-02                                                   6.79E-02 Fe-55                                        2.45E+00                                                   2.30E+00

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Radionuclides          8100X-3-CJ              -GSSX-058 8100X-3-CR-GSSX-029 Mn-54                     0.00E+00                         0.00E+00 Np-237                     0.00E+00                         0.00E+00 Ni-59                    0.00E+00                         0.00E+00 Ni-63                    0.00E+00                          4.64E-01 Nb-94                     3.37E-03                          1.79E-01 Pu-238                    2.85E-03                          1.90E-02 Pu-239/240                   1.35E-02                          9.91E-03 Pu-241                    1.36E+00                         1.76E+00 Ag-110m                     0.00E+00                         0.00E+00 Sr-90                    1.09E-01                          3.00E-02 Tc-99                     0.00E+00                         0.00E+00 H-3                     0.00E+00                         0.00E+00 Zn-65                     2.89E-03                         0.00E+00 Note: Bold values indicate concentration greater than MDC. Unbolded values indicate the value below MDC. All values in pCi/g.

Based upon a                                                                                                                                                 review of the historical information  and the completion of a Survey Unit Classification Worksheet, the correct final classification of   Survey Unit 8105 was determined to be Class 3.
: 4.                                                         DATA QUALITY OBJECTIVES

FSS planning and design relies                                                                                             on a properly executed data quality objective (DQO) process to ensure, through compliance with explicitly defined inputs and boundaries, that the primary objective of the survey is satisfied. The DQO process, utilized in accordance with MARSSIM, is described in the  FCS LTP. The appropriate design for a given survey was                                                                                                                                      developed using the DQO process as outlined in Appendix D of MARSSIM                                   . A summary of                         the seven steps of the DQO process are outlined in the following paragraphs.
The DQO process incorporates hypothesis testing and probabilistic sampling distributions to control decision errors during data analysis. Hypothesis testing is a process based on the scientific method that compares a baseline condition to an alternate condition. The baseline condition is technically known as the null hypothesis. Hypothesis testing rests on the premise that the null hypothesis is true, and sufficient evidence must be provided to reject it in favor of the alternative hypothesis. In designing the survey plan, the underlying assumption, or null hypothesis was that residual activity in the survey unit exceeded the release criteria  . Rejection of the null hypothesis would indicate that residual activity within the survey unit does not exceed the release criteria   .
Therefore, the survey unit would satisfy the primary objective of the FSS sample             plan.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8105 NORTH OWNER CONTROLLED AREA

The primary objective of the FSS sample plan is to demonstrate that the level of residual radioactivity in Survey Unit 8105 did not exceed the release criteria specified in the LTP and that the potential dose from residual radioactivity is   as low as is reasonably achievable (ALARA).
TSD 21-043,Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan (Reference             6) establishe                                    s the basis for an initial suite of potential ROC for decommissioning. LTP Chapter 2 provides detailed characterization data that describes the results of surveys completed of soil. Surface             samples were taken in each impacted open land survey unit and analyzed for the presence of plant-derived radionuclides. The results of surface soil characterization in the impacted area surrounding FCS indicate that there is minimal residual radioactivity in soil.
Insignificant contributors (ICs) were determined consistent with the guidance contained in Section 3.3 of NUREG            -1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance
- Characterization                                    , Survey, and Determination of Radiological Criteria  (Reference             7). For soil, the ROCs were found to be Cs-137, Co-60, Eu-152, and C-14. The remaining radionuclides were designated as IC and were eliminated from further detailed evaluation.
Section 5.2.6 of the LTP states that each radionuclide specific B            cDCGL is equivalent to the level of residual radioactivity (above background levels) that could, when considered independently, result in a total effective dose equivalent (TEDE) of 25 mrem/yr to an Average Member of the Critical Group. To ensure that the summation of dose from each source term is 25 mrem/yr or less after all FSS is completed, the  BcDCGLs are reduced based on an expected, or  a priori, fraction of the 25 mrem/yr dose limit from each source term. The reduced DCGLs (i.e., OpDCGLs                       ) can be related to the BcDCGLs as an expected fraction of dose based on an a priori                                     assessment of what the expected dose should be based on the results of site characterization, process knowledge, and the extent of planned remediation. The OpDCGL is then used as the DCGL for the FSS design of the survey unit (e.g., calculation of surrogate DCGLs or, investigation levels). Details of the OpDCGLs derived for each dose component and the basis for the applied a priori dose fractions are provided in Section 5.2.6 of the LTP.
Multiple ROCs are known to be present at FCS           . The dose contribution from each ROC is accounted for using the SOF to ensure that the total dose from all ROC does not exceed the dose criterion. A BcDCGL that is established for the average residual radioactivity in a survey unit is equivalent to a derived concentration guideline level wide area (            DCGLW) as defined in MARSSIM.
At FCS, compliance is demonstrated through the summation of dose from seven distinct source terms (i.e., basements, soils, buried pipe,                                     embedded pipe, above-ground structures, basement fill, and groundwater) for the end state. When applied to soil, the DCGLs are expressed in units of activity per unit of mass (pCi/g).

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8105 NORTH OWNER CONTROLLED AREA

For FCS, soil is             defined as a layer of soil beginning at the surface but extending to a depth of 1 m to allow for flexibility in compliance demonstration if contamination deeper than 0.15 m is encountered. Based on characterization data and historical information, there are no expectations of encountering a source term geometry that is comprised of a clean surface layer of soil over a contaminated subsurface soil layer. Section 6.9 of the LTP provides the exposure scenarios and modeling parameters that were  used to calculate the site-                                   specific soil DCGLs. The adjusted soil DCGLs for the unrestricted release of open land survey units as provided in the Section 6.16 of the LTPare                                                                                                  pre                        sented in Table 4-1. The IC dose percentage of                                                 5% was used to adjust the DCGLs in Table                                     4-1to account for the dose from the eliminated IC radionuclides.

Table 4 Base Case DCGLs for Soil Surface Soil                Subsurface Radionuclide                  BcDCGL                 Soil BcDCGL (pCi/g)                   (pCi/g)
C-14                                                                                                                                                                                      5.70E+01                                                                                                                                                    9.68E+00 Co-60                   3.77E+00                   2.93E+00 Cs-137                                                                                                                                                1.31E+01                                                                                                                                                 7.27E+00 Eu-152                                                                                                                                               8.41E+00                                                                                                                                                    7.36E+00

The reduced DCGLs, OpDCGLs, are calculated using Equation 5-1 from Chapter 5 of the LTP, shown as Equation 4-1 below.

Equation 4 OpDCGL Calculation

The OpDCGLs for the unrestricted release of               soil are provided in Table                                    4-2.

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Table 4 Operational DCGLs for Soil Surface Soil              Subsurface Radionuclide                OpDCGL                Soil OpDCGL (pCi/g)                   (pCi/g)
C-14                                                                                                                                                                                      1.59E+01                                                                                                                                                        2.71E+00 Co-60                                                                                                                                         1.06E-00                                                                                                                         8.21E-01 Cs-137                                                                                                                                                3.65E+00                                                                                                                                                            2.04E-00 Eu-152                                                                                                                                               2.36E+00                                                                                                                                                            2.06E-00

Instrument DQOs included a verification of the ability of the survey instrument to detect the radiations of interest relative to the OpDCGL . Survey instrument response checks were required prior to issuance and after the instrument had been used. Control and accountability of survey instruments was required to assure the quality and prevent the loss of data.
As part of the DQOs applied to laboratory processes, analysis results were reported as actual calculated results. The actual                                            reported value was used as the recorded FSS result for measurement and sample values that are less than MDC. Negative values were recorded as zero                        . Results were not reported as less than MDC. Sample report summaries included unique sample identification, analytical method, radionuclide, result, uncertainty, laboratory data qualifiers, units, and the observed MDC.
In accordance with the LTP, for laboratory analysis, MDCs less than  10% of the OpDCGL were preferable, while MDCs up to 50%                                                                                    of the OpDCGL were acceptable. The minimum acceptable MDC for measurements obtained using field instruments was 50% of the applicable OpDCGL.
: 5.                                                         SURVEY DESIGN

The level of effort associated with planning a survey is based on the complexity of the survey and nature of the hazards. Guidance for preparing FSS plans is provided in procedure                                     FCSD-RA-                                                                  LT-302, Final Status Survey Sample Plan                                     Development (Reference 3).
The DQO process validated that Co                                    -60, Cs                                                                        -137, Eu                                                                       -152, and C-14 would be the ROCs in Survey Unit 8105 as presented in LTP Section                                                                                                                         5.2.5. As discussed in LTP Section 5.2.6.2, instead of inferring the  concentrations for the hard           -to-detect (HTD) ROC                                               C-14 using a surrogate approach, 100% of all samples collected in the survey unit were sent for off             -site analysis for C-14. Table                         5-1 presents the action levels for  Survey Unit 8105sample results and are based on 50% of the OpDCGLs.

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Table 5 Action Levels for                                                                         Survey Unit 8105 ROC                           Action Level (pCi/g)
Co-60                                                                                                                                                                                                                                                    5.30E-01 Cs-137                                                                                                                                                                                                                                                            1.83E+00 Eu-152                                                                                                                                                                                                                                                           1.18E+00 C-14                                                                                                                                                                                                                                                                                                  7.95E+00

The Sign Test was selected as the nonparametric statistical test  to demonstrate compliance with the release criteria. The use of the Sign Test did not require the selection or use of a background reference area, which  simplified survey design and implementation. This approach was conservative since it included background Cs-137 as part of the sample set.
The number of soil samples for FSS was determined in accordance with procedureFCSD                                  -RA-LT-302 (Reference                                                                                                                                               3). The relative shift (/) for the survey unit data set is defined as shift (),
which is the upper boundary of the                                     gray region (UBGR), or the DCGL (SOF of 1), minus the lower bound of the gray region (LBGR)                                                                        , divided by sigma (), which is the standard deviation of the data set used for survey design. The optimal value for / should range between 1 and 3. The largest value the / can have is 3. If the calculated value of / exceeds 3, an adjusted value of 3 will be used for /. The / for                         Survey Unit 8105, based                                                                         on the data for surface soil samples collected during the                                                             characterization             of Survey Unit                                     8105, was calculated as follows:

Equation 5 Relative Shift
                                                                        =                (1                 0.0717)=               25.8 0.036

As the calculated / was greater than 3, a value of 3 was used as the adjusted /. Both the Type I error (i.e.,  value                                        ) and the Type II error (i.e.,  value) w                            ereset at 0.05. The sample size from Table 5-5 of MARSSIM that equates to the Type I and Type II error of 0.05 for use with the Sign Test is an N value of 14.
A prospective power curve was generated using             MARSSIM Power 2000, a software package developed under the sponsorship of the United States Nuclear Regulatory Commission (NRC) for implementation of the MARSSIM in support of the decommissioning license termination rule (10 CFR 20, Subpart E). The result of the MARSSIM Power 2000 computer run showed adequate power for the survey design.
Given that Survey Unit 8105 is                                                                                     Class            3, sample locations were selected                                                 randomly. The                                                random locations of the soil             samples were selected using Visual Sample Plan (VSP)             , in accordance with

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8105 NORTH OWNER CONTROLLED AREA

FCSD-RA-LT-302 (Reference                                                                                                                                               3). Input parameters included use of aerial photographs and the random sampling tool set with a predetermined number (14) of samples              . The random coordinates generated with the                                    VSP were integrated with a GPS to  identify sample locations in the field.
Table 5-2                        lists the random samples collected for FSS and the corresponding GPS coordinates, based on the Nebraska State Plan            e North American Datum 1983 coordinate system.

Table 5 Random Sample Locations Sample ID               Northing         Easting 8105X-3-FR-GSSX-001           194549.286      826298.874 8105X-3-FR-GSSA-002           194467.978      826615.410 8105X-3-FR-GSSX-003           194614.332      826351.630 8105X-3-FR-GSSX-004           194516.763      826457.142 8105X-3-FR-GSSX-005           194809.470      826325.252 8105X-3-FR-GSSX-006           194565.547      826536.276 8105X-3-FR-GSSX-007           194711.901      826430.764 8105X-3-FR-GSSX-008           194484.240      826378.008 8105X-3-FR-GSSX-009           194679.378      826312.063 8105X-3-FR-GSSX-010           194581.809      826417.575 8105X-3-FR-GSSX-011           194589.036      826470.331 8105X-3-FR-GSSX-012           194491.467      826338.441 8105X-3-FR-GSSX-013           194637.821      826549.465 8105X-3-FR-GSSX-014           194540.252      826654.977

In accordance with the sample plan, at least one judgmental sample is required from the survey unit. The number of judgmental samples collect            ed was 23, which brings the total number of samples collected for the FSS of Survey Unit 8105 to 37. Table                                                                                                            5-3                         lists the judgmentalsamples collected for FSS and the corresponding GPS coordinates.

Table 5 Judgmental Sample Locations Sample ID                   Northing             Easting 8105X-3-FJ-GSSX-015             194489.245           826585.300 8105X-3-FJ-GSSX-016             194564.011           826324.820 8105X-3-FJ-GSSX-017             194588.598           826454.454 8105X-3-FJ-GSSX-018             194577.015           826462.803 8105X-3-FJ-GSSX-019             194593.121           826458.539 8105X-3-FJ-GSSX-020             194575.974           826477.486 8105X-3-FJ-GSSX-021             194576.604           826477.441 8105X-3-FJ-GSSA-022             194603.694           826466.843 8105X-3-FJ-GSSX-023             194581.263           826479.945

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Sample ID                          Northing                  Easting 8105X-3-FJ-GSSX-024                       194592.570                826473.366 8105X-3-FJ-GSSX-025                       194603.713                826467.340 8105X-3-FJ-GSSX-026                       194579.026                826484.460 8105X-3-FJ-GSSX-027                       194601.554                826472.864 8105X-3-FJ-GSSX-028                       194545.502                826656.407 8105X-3-FJ-GSSX-029                       194534.824                826638.116 8105X-3-FJ-GSSX-030                       194509.284                826439.705 8105X-3-FJ-GSSX-031                       194504.380                826439.951 8105X-3-FJ-GSSX-032                       194497.510                826448.538 8105X-3-FJ-GSSX-033                       194510.740                826459.524 8105X-3-FJ-GSSX-034                       194510.747                826465.520 8105X-3-FJ-GSSX-035                       194575.113                826544.082 8105X-3-FJ-GSSX-036                       194580.569                826532.245 8105X-3-FJ-GSSX-037                       194691.990                826327.751

The implementation of quality control (QC)          measures as referenced by Section 5.6.3 of the LTP and FCSD                                                           -RA-                                                                  LT-100,                                                           Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station (QAPP; Reference 8) includes the collection of a soil sample for split sample analysis on 5              % of the soil samples taken in a survey unit with the locations selected at random. Four soil             samples, 8105X-3-FR-GSSB-002, 8105X-3-FJ-GSSB-022, 8105X-3-FQ-GSSX-014 and 8105X-3-FQ-GSSX-033, weredesignated                                  for split             or duplicate sample             QC analysis for the FSS of Survey Unit 8105.
Section 5.3.4 and Table 5                                                            -20 of the LTP                                                             specify that for Class                             3 open land survey units, surface scans will be performed on a judgmental percentage of the surface area in the survey unit            . For Survey Unit 8105, 10% scan coveragewas selected                                                                                                                                              , which equals 9,994 m                                                      2.
For this Class 3 open land survey unit, the Investigation Levels for area scanning and soil sample measurement results are those levels specified in  the Table 5           -24 of the LTPand are reproduced below in Table                                     5-4.

Table 5 Investigation Levels Classification                         Scan Investigation Levels                            Direct Investigation Levels

Class 3                                                                                                                                                                        >Operational DCGL or >MDCscan if MDCscan is greater than Operational DCGL                                                                                                                                                                                                                                                              >0.5 Operational DCGL

Table 5-5 provides a synopsis of the survey design for                                                             Survey Unit 8105.

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Table 5 Synopsis of Survey Design Feature                                                       Design Criteria                                                                  Basis Survey Unit Surface Area                                                                                                                                                                                                                                                                          99,994 m2                                                                                                                                                                                                                                                                                                                                                                                                                                                       GPS Number of Random Samples (N)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          14                                                                                                                                                                         *                         / = 3 (adjusted)
* MARSSIM Table 5.5
* Co-60:                       1.06 pCi/g DCGLs
* Cs-137: 3.65 pCi/g        Operational DCGLs for soil,
* Eu-152: 2.36 pCi/g                     LTP,                                                                         Table 5-8
* C-14: 15.9 pCi/g Scan and Direct Investigation                                                             Table 5-4                                                                                                                                                                                                                                                                                                                                                            LTP,                                                                         Table 5-24 Levels Scan Areal Coverage                                           9,994 m2, 10% areal coverage                                                       LTP, Table 5-20

Judgmental Samples                                                                                                                                                                                                                                                                                                                                                                                              1 Per Survey Design 23                                              Actual Number Obtained HTD ROC Analysis                                                                                                                                                                                                                                                                                                                                                            100%  LTP, Section 5.2.6.2 37                                         Number of Samples Analyzed 1 duplicate and 1 split sample                                                   LTP, Section 5.6.3 QC                                                     selected at random                                              Actual Number Obtained 4
: 6.                                                         SURVEY IMPLEMENTATION

For Survey Unit 8105, compliance with the unrestricted release criteria was demonstrated through a combination of soil scanning with a Ludlum Model 44-20 gamma detector                                                             and the sampling of soil for isotopic analysis .
A License Termination/Final Status Survey (LT/FSS) Supervisor performed a visual inspection and walk-down of the survey unit on April 28, 2022, prior to performing FSS. The purpose of the walk-down was to assess the physical condition of the survey unit, evaluate access points and travel paths, and identify potentially hazardous conditions. At the time of survey, the soil in the survey unit was dry and free of any considerable constraint for the collection of samples and scan measurements.
FSS field activities were conducted  under the FSS            sample plan and  included DQOs, survey design, detailed FSS instructions, job safety analysis, and related procedures for reference. FSS field activities were projected to take 10 working days to complete. Daily briefings were conducted to discuss the expectations for job performance and to review the            safety aspects of the job. A Field Log                                                                        was used to document field activities and other information pertaining to the

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performance of the FSS. FSS field activities commenced on                          June 2, 2022, and concluded on August 08, 2022.
A total of 15 different scan                              areas were scanned using a Ludlum Model 3001 paired with a Ludlum Model 44-20 (3 x 3) sodium iodide (NaI) detector and Trimble GPS                                                                                                      unit. The background was established as the average of fiveone                                  -minute static measurements, while maintaining the detector 6 from the soil. In   Survey Unit 8105, background ranged from 20,580 counts per minute (cpm) up to 31,180 cpm.
All designated scan areas were scanned using  the Model 44-20 detector operated in the rate-                                             meter mode and using audio response. The probe was positioned no more than 2 from the ground and was moved at a scan speed of approximately 0.25m per second. In accordance with                                                                                                 FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors                                                           (Reference             9), scan MDC was sufficient to detect residual radioactivity at the action level. Complete scan results are provided in Attachment 2.
The 14 random sample locations were marked with             flags based on GPS coordinates provided.
Each soil sample consisted of approximately 1 liter of soil. The soil   sample media was sifted to remove stones and other media larger than 1 centimeter in diameter. All soil    samples were collected, controlled, transported, stored, and transferred to the on                                                -site laboratory using the chain-of-custody process from                                                                                     FCSD-RA-LT-205,                                                           Chain-of-Custody Protocol for Site Characterization and Final Status Survey  (Reference             10), and in accordance with FCSD                                                                                   -RA-                                                                  LT-203, Sample Media Collection for Site Characterization and Final Status Survey   (Reference             11) and FCSD                                                           -RA-                                                                  LT-204,                                                           Sample Media Preparation for Site Characterization and Final Status Survey (Reference             12).
The survey design specified that 100% of the             samples were required for the HTD ROC analysis.
In total, 37 samples were selected for HTD radionuclide analysis.
The implementation of survey specific QC measures included the collection of four             sample           s (8105X-3-FQ-GSSX-014                        , 8105X-3-FQ-GSSX-033, 8105X                                  FR-GSSB-002, 8105X-3-FR-GSSB-022) for split                                                                         or duplicate             sample analysis.
: 7.                                                         SURVEY RESULTS

All areas identified in the FSS  sample plan were scanned for elevated activity levels.             The 9,994 m2 scan requirement was achieved by scanning             15 areas, GW                                                                                                                         -1 through GW-15, within accessible land. Figure 16                                    -1 in Attachment 1 presents the scan areas within the unit.                                                                         Judgmental samples did not have an Action Level, as the readings were taken to verify the readings identified in the Z-Score analysis. Table 7-1provides an overview of the scan results for all the gamma

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walkovers. Complete scan results are provided in Attachment 2, Error! Reference source not found..

Table 7 Synopsis of Scan Results

Min Scan      Max Scan       Action         Scan Scan Area       Logged        Logged         Level       Alarms?      Judgmental Reading       Reading        (cpm)        (Y/N)         Samples (cpm)         (cpm)
GW-1           22301         32993         31081          Y               1 GW-2           4322          31846         30220          Y               0 GW-3           19952         34568         32414          Y               0 GW-4           27276         33403         31409          Y               5 GW-5           22825         32324         30261          Y               0 GW-6           26363         32797         31061          Y               2 GW-7           18613         34867         32721          Y               0 GW-8           19371         33297         31922          Y               0 GW-9           16441         33619         32106          Y               1 GW-10          17407         33016         31983          Y               0 GW-11          23203         36562         30425          Y              11 GW-12          23377         31828         30589          Y               0 GW-13          19016         31082         30056          Y               0 GW-14          25466         31049         29604          Y               2 GW-15          19020         30780         30589          Y               1 GW-14Q          19090         32586         31102          Y               0

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For Survey Unit 8105GW                                                                                                                        -1, count rates ranged between 22,301 cpm and 32,993 cpm, with a mean count rate of 29,650                                                                                     cpm and a standard deviation of 853 cpm. Figure 7-1below presents a map of the gamma walkover for  Survey Unit 8105 GW                                                            -1.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -1 GPS Scan Results

An evaluation of Survey Unit 8105 GW 1                                                                                                                        data set was performed to assess the small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement, (i.e.,
+3 Z-Score). One                         location was selected for biased sample collection based on evaluation of the gamma walkover data. This biased location represented the maximum measurement encountered within the scan area. Figure 7-2below                                    presentsa                                            map of the +3 Z-                                    Score measurements within Survey Unit 8105GW                                                                                                            -1 and the selected biased sampling location.

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Figure 7 Survey Unit 8105 GW                                                                                                                                                -1 Z-Score and Sample Map            (Location 16)

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For Survey Unit 8105 GW                                                                                                                        -2, count rates ranged between 4,322 cpm and 31,846 cpm, with a mean count rate of 28,886 cpm and a standard deviation of 1,319 cpm. Figure                         7-3below presents a map of the gamma walkover for Survey Unit 8105 GW                                                            -2.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -2 GPS Scan Results

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An evaluation of the Survey Unit 8105 GW                                                            2 data set was performed to assessthe                                                                                                                                                 small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement, (i.e.,
+3 Z-Score). Zero                         locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-4 below presents a                                                            map of the +3 Z-Score measurements within Survey Unit 8105 GW                                    -2.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -2 Z-Score Map

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For Survey Unit 8105GW                                                                                                                        -3, count rates ranged between 19,952 cpm and 34,568 cpm, with a mean count rate of 31,018 cpm and a standard deviation of 1,449 cpm. Figure                         7-5below presents a map of the gamma walkover for Survey Unit 8105 GW                                                            -3.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -3 GPS Scan Results

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An evaluation of the Survey Unit 8105 GW                                                            -3 data set was performed to assessthe                                                                                                                                                 small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement, (i.e.,
+3 Z-Score). Zero                         locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-6 below presents a                                                            map of the +3 Z-Score measurements within Survey Unit 8105 GW                                    -3.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -3 Z-Score Map

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For Survey Unit 8105GW                                                                                                                        -4, count rates ranged between 27,276 cpm and 33,403 cpm, with a mean count rate of 30,030 cpm and a standard deviation of 799 cpm. Figure 7-7below presents a map of the gamma walkover for  Survey Unit 8105 GW                                                            -4.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -4 GPS Scan Results

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An evaluation of the Survey Unit 8105 GW                                                            -4 data set was performed to assessthe                                                                                                                                                 small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement. Five locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-8below presents a                                     map of the +3 Z-Score measurements within             Survey Unit 8105 GW-4 and the selected biased sampling locations.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -4 Z-Score and Sample            Map (Locations 30-34)

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For Survey Unit 8105GW                                                                                                                        -5, count rates ranged between 22,825 cpm and 32,324 cpm, with a mean count rate of 27,716 cpm and a standard deviation of 1,354 cpm. Figure                         7-9below presents a map of the gamma walkover for Survey Unit 8105 GW                                                            -5.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -5 GPS Scan Results

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An evaluation of Survey Unit 8105 GW                                                                                                                        -5 data set was performed to evaluate                                     the small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement. Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-10below presents                                                             a map of the +3 Z-Score measurements within             Survey Unit 8105 GW-5.

Figure 7 Survey Unit 8105 GW                   -5 Z-Score                                    Map

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For Survey Unit 8105GW                                                                                                                        -6, count rates ranged between 26,363 cpm and 32,797 cpm, with a mean count rate of 29,809 cpm and a standard deviation of 802 cpm. Figure 7-11below presents a map of the gamma walkover for  Survey Unit 8105 GW                                                            -6.

Figure 7 Survey Unit 8105 GW                   -6 GPS Scan Results

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An evaluation of the Survey Unit 8105 GW                                                            -6 data set was performed to evaluate                                     the small areas of elevated activity which exceeded three standard  deviations above the mean measurement. T                        wo locations were selected for biased sample collection based on evaluation of the  gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure            7-12below presents                                                             a map of the +3 Z-Score measurements within             Survey Unit 8105 GW-6 and the selected biased sampling locations.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -6 Z-Score andSample                                                                              Map (Locations 35-36)

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For Survey Unit 8105GW                                                                                                                        -7, count rates ranged between 18,613 cpm and 34,867 cpm, with a mean count rate of 31,406 cpm and a standard deviation of 1,129 cpm. Figure                         7-13 below presents a map of the gamma walkover for Survey Unit 8105 GW                                    -7.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -7 GPS Scan Results

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An evaluation of the Survey Unit 8105 GW                                                            -7 data set was performed to assessthe                                                                                                                                                 small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement. Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-14below presents                                                             a map of the +3 Z-Score measurements within             Survey Unit 8105 GW-7.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -7 Z-Score Map

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For Survey Unit 8105GW                                                                                                                        -8, count rates ranged between 19,371 cpm and 33,297 cpm, with a mean count rate of 29,816                                                             cpm and a standard deviation of 1,660 cpm. Figure                         7-15 below presents a map of the gamma walkover for Survey Unit 8105 GW                                    -8.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -8 GPS Scan Results

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An evaluation of the Survey Unit 8105 GW                                                            -8 data set was performed to assessthe                                                                                                                                                 small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement. Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-16below presents                                                             a map of the +3 Z-Score measurements within             Survey Unit 8105 GW-8.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -8 Z-Score Map

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For Survey Unit 8105GW                                                                                                                        -9, count rates ranged between 16,441 cpm and 33,619 cpm, with a mean count rate of 30,015 cpm and a standard deviation of 1,115 cpm. Figure                         7-17 below presents a map of the gamma walkover for             Survey Unit 8105 GW                                    -9.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -9 GPS Scan Results

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An evaluation of Survey Unit 8105 GW                                                                                                                        -9 data set was performed to assess the small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement. One location was                                                            selected for biased sample collection based on evaluation of the gamma walkover data. This                         biased location represented the maximum measurement encountered within the scan area. Figure 7-18below present                                                            s a map of the +3 Z-                     Score measurements within             Survey Unit 8105 GW-9 and the selected biased sampling locations.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -9 Z-Score Map and Sample (Location 37)

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For Survey Unit 8105GW                                                                                                                        -10, count rates ranged between                                                 17,407 cpm and 33,016 cpm, with a mean count rate of 30,051 cpm and a standard deviation of 1,665 cpm. Figure 7-19                          below presents a map of the gamma walkover for             Survey Unit 8105 GW                                                            -10.

Figure 7                                                                      Survey Unit 8105 GW                     -10                                                           GPS Scan Results

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An evaluation of the Survey Unit 8105 GW                                                            -10 data set was performed to assess the small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement. Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-20below present                                                            s a map of the +3 Z-                     Score measurements within             Survey Unit 8105 GW-10.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -10 Z-Score Map

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For Survey Unit 8105GW                                                                                                                        -11, count rates ranged between                                                 23,203 cpm and 36,562 cpm, with a mean count rate of 29,485 cpm and a standard deviation of 845 cpm. Figure 7-21below presents a map of the gamma walkover             for             Survey Unit 8105 GW                                                            -11.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -11 GPS Scan Results

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An evaluation of the Survey Unit 8105 GW                                                            -11 data set was performed to assess the small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement. Eleven locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-22below present                                                            s a map of the +3 Z-                     Score measurements within             Survey Unit 8105 GW-11 and the selected biased sampling locations.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -11 Z-Scoreand Sample                                                       Map (Locations 17-27)

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For Survey Unit 8105GW                                                                                                                        -12, count rates ranged between                                                 23,377 cpm and 31,828 cpm, with a mean count rate of 28,482 cpm and a standard deviation of 1,072 cpm. Figure                         7-23 below presents a map of the gamma walkover for             Survey Unit 8105 GW                                    -12.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -12 GPS Scan Results

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An evaluation of the Survey Unit 8105 GW                                                            -12 data set was performed to assess the small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement. Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-24below present                                                            s a map of the +3 Z-                     Score measurements within             Survey Unit 8105 GW-12.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -12 Z-Score Map

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For Survey Unit 8105GW                                                                                                                        -13, count rates ranged between                                                 19,016 cpm and 31,082 cpm, with a mean count rate of 28,259 cpm and a standard deviation of 971 cpm. Figure 7-25below presents a map of the gamma walkover             for             Survey Unit 8105 GW                                                            -13.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -13 GPS Scan Results

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An evaluation of the Survey Unit 8105 GW                                                            -13 data set was performed to evaluate                                                             the small areas of elevated activity which exceeded three standard  deviations above the mean measurement. Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-26below present                                                            s a map of the +3 Z-                     Score measurements within             Survey Unit 8105 GW-13.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -13 Z-Score Map

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For Survey Unit 8105GW                                                                                                                        -14, count rates ranged between                                                 25,466 cpm and 31,049 cpm, with a mean count rate of 28,253 cpm and a standard deviation of 771 cpm. Figure 7-27below presents a map of the gamma walkover             for the GW            -14.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -14 GPS Scan Results

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An evaluation of Survey Unit 8105 GW                                                                                                                        -14 data set was performed to assess the small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement. Two locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-28below present                                                            s a             map of the +3 Z-Score measurements within             Survey Unit 8105 GW-14.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -14 Z-Scoreand Sample Map (                                                      Locations 28-29)

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For Survey Unit 8105GW                                                                                                                        -15, count rates ranged between                                                 19,020 cpm and 30,780 cpm, with a mean count rate of 27,615 cpm and a standard deviation of 3,415 cpm. Figure                         7-29 below presents a map of the gamma walkover for             Survey Unit 8105 GW                                    -15.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -15 GPS Scan Results and Sample                                                            (Location 15)

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An evaluation of the Survey Unit 8105 GW                                                            -15 data set was performed to assess the small areas of elevated activity which exceeded three standard                                     deviations above the mean measurement. One location was selected for biased sample collection based on evaluation of the gamma walkover data. Th                        is biased locations represented the maximum measurements encountered within the scan area. Figure            7-30below present                                                            s a map of the +3 Z-                     Score measurements within             Survey Unit 8105 GW-15. The location of the judgmental sample in GW-15 is denoted in Figure 7-29.

Figure 7 Survey Unit 8105 GW                                                                                                                                                -15 Z-Score Map

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For Survey Unit 8105 GW-14Q, count rates ranged between 19,090 cpm and 32,586 cpm, with a mean count rate of 29,660 cpm and a standard deviation of 831 cpm. Figure 7-31below presents a map of the gamma walkover for Survey Unit 8105 GW-14Q.

Figure 7 Survey Unit 8105 GW-                        14Q GPS Scan Results

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An evaluation of the Survey Unit 8105 GW-14Q data set was performed to evaluate the small areas of elevated activity which exceeded three standard deviations above the mean measurement.
Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-32below presents a map of the +3 Z                                                                                    -Score measurements within Survey Unit 8105 GW-14Q.

Figure 7 Survey Unit 8105 GW-14Q Z-                        Score Map

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The on-site laboratory analyzed the 14 soil samples taken for nonparametric statistical testing using the on-site gamma spectroscopy system. A summary of the results for the 14 samples collected for nonparametric statistical testing is provided in   Table 7-2. Gamma spectroscopy results revealed that             Cs-137 waspositively identifiedin                                                                                         five random samples. No other ROCs were positively identified. The off-site laboratory, GEL Laboratories, analyzed the 14 random samples for the HTD ROC C-14. C-14 was not detected in any of the 14 random samples. The maximum operational sum of fractions (OpSOF) for random samples is 0             .2475.
The basic statistics for the random sample population, as compared to the BcDCGLs, and the survey unit dose aresummarized in                                               Table 7-3.
The SOF or unity rule is the mathematical test used to evaluate compliance with radiological criteria for license termination when more than one radionuclide has been determined to be potentially present. The equation for the unity rule is:

Equation 7 Unity Rule C1                                                                                                                                                                                                                                                                                      +                                                                                                                                                                                                                                                                                                        DCGLC2+............Cn1 DCGL1                          DCGL2                                                           n Where:                                                                                                                            Cn                                                                                                                                                  =                                                                                                         concentration of radionuclide n DCGLn                                                                                                                                  =                                                                                                         DCGL of radionuclide n           .

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Samples Comprising the Statistical Sample Population

Sample ID                                                 ROC                            Activity                             OpDCGL                                  Fraction of                             OpSOF (pCi/g)                                 (pCi/g)                              OpDCGL

Co-60                                                                                              1.04E-02                                                                                                      1.06E+00                                                                                                                                                      9.81E-03 8105X                            FR-GSSX-001                         Cs-137                          1.10E-01                               3.65E+00                                  3.01E-02                             0.12003 Eu-152                           1.89E-01                               2.36E+00                                  8.01E-02 C-14                         0.00E+00                                1.59E+01                                 0.00E+00 Co-60                                                                                              1.58E-01                                                                                                      1.06E+00                                                                                                                                                   1.49E-01 Cs-137                                                                                                           1.72E-01                                                                                                      3.65E+00                                                                                                                                                   4.71E-02 8105X                            FR-GSSA-002                        Eu-152                                                                                                     0.00E+00                                                                                                                                       2.36E+00                                                                                                                                               0.00E+00 0.19715

C-14                                                                                                                                                1.54E-02                                                                                                      1.59E+01                                                                                                                                                   9.69E-04 8105X                            FR-GSSX-003                                                                                                  Co-60                                                                                              3.96E-02                                                                                                      1.06E+00                                                                                                                                                   3.74E-02                                                                                       0.08887 Cs-137                                                                                                           1.88E-01                                                                                                      3.65E+00                                                                                                                                                   5.15E-02

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Sample ID                                                                                                                            ROC                                                                     Activity                                                                              OpDCGL                                                                                      Fraction of                                                                                  OpSOF (pCi/g)                                                                                      (pCi/g)                                                                                OpDCGL

Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                            0.00E+00                                                                                                                                         1.59E+01                                                                                                                                                 0.00E+00 Co-60                                                                                              9.40E-03                                                                                                      1.06E+00                                                                                                                                                      8.87E-03 8105X                            FR-GSSX-004                                                                                                                      Cs-137                                                                                                          1.69E-01                                                                                                                                             3.65E+00                                                                                                                                                      4.63E-02 0.09614 Eu-152                                                                                                         9.67E-02                                                                                                      2.36E+00                                                                                                                                                      4.10E-02 C-14                                                                                                                                            0.00E+00                                                                                                                                         1.59E+01                                                                                                                                                 0.00E+00 Co-60                                                                                              6.26E-02                                                                                                      1.06E+00                                                                                                                                                      5.91E-02 8105X                            FR-GSSX-005                                                                                                                      Cs-137                                                                                                           2.59E-01                                                                                                      3.65E+00                                                                                                                                                      7.10E-02 0.13002 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                            0.00E+00                                                                                                                                         1.59E+01                                                                                                                                                 0.00E+00 Co-60                                                                                              1.88E-02                                                                                                      1.06E+00                                                                                                                                                      1.77E-02 8105X                            FR-GSSX-006                                                                                                                      Cs-137                                                                                                          1.69E-01                                                                                                                                             3.65E+00                                                                                                                                                      4.63E-02 0.06404 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                            0.00E+00                                                                                                                                         1.59E+01                                                                                                                                                 0.00E+00 Co-60                                                                                              1.07E-01                                                                                                      1.06E+00                                                                                                                                                      1.01E-01 8105X                            FR-GSSX-007                                                                                                                      Cs-137                                                                                                           1.44E-01                                                                                                      3.65E+00                                                                                                                                                      3.95E-02 0.19423 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                               8.56E-01                                                                                                                                             1.59E+01                                                                                                                                                      5.38E-02 Co-60                                                                                              7.41E-02                                                                                                      1.06E+00                                                                                                                                                      6.99E-02 8105X                            FR-GSSX-008                                                                                                                      Cs-137                                                                                                           6.28E-02                                                                                                      3.65E+00                                                                                                                                                      1.72E-02 0.10246 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                                2.44E-01                                                                                                      1.59E+01                                                                                                                                                      1.53E-02 Co-60                                                                                              1.05E-01                                                                                                      1.06E+00                                                                                                                                                      9.91E-02 8105X                            FR-GSSX-009                                                                                                                      Cs-137                                                                                                           3.12E-01                                                                                                      3.65E+00                                                                                                                                                      8.55E-02 0.18454 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                            0.00E+00                                                                                                                                         1.59E+01                                                                                                                                                 0.00E+00 Co-60                                                                                              1.00E-01                                                                                                      1.06E+00                                                                                                                                                      9.43E-02 Cs-137                                                                                                           1.83E-01                                                                                                      3.65E+00                                                                                                                                                      5.01E-02 8105X                            FR-GSSX-010                                                                                                                      Eu-152                                                                                                         2.18E-01                                                                                                      2.36E+00                                                                                                                                                      9.24E-02 0.24748

C-14                                                                                                                                                1.69E-01                                                                                                      1.59E+01                                                                                                                                                      1.06E-02

8105X                            FR-GSSX-011                                                                                                  Co-60                                                                                              1.47E-01                                                                                                      1.06E+00                                                                                                                                                      1.39E-01                                                                                       0.21308 Cs-137                                                                                                           2.34E-01                                                                                                      3.65E+00                                                                                                                                                      6.41E-02

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Sample ID                                                        ROC                                 Activity                                  OpDCGL                                        Fraction of                                  OpSOF (pCi/g)                                       (pCi/g)                                   OpDCGL

Eu-152                                                                                                         4.39E-03                                                                                                      2.36E+00                                                                                                                                                      1.86E-03 C-14                                                                                                                                                1.34E-01                                                                                                      1.59E+01                                                                                                                                                      8.43E-03 Co-60                                                                                          0.00E+00                                                                                                                                         1.06E+00                                                                                                                                                 0.00E+00 8105X                            FR-GSSX-012                                   Cs-137                                                                                                           7.43E-02                                                                                                      3.65E+00                                                                                                                                                      2.04E-02 0.08531 Eu-152                                                                                                         1.44E-01                                                                                                      2.36E+00                                                                                                                                                      6.10E-02 C-14                                                                                                                                                6.26E-02                                                                                                      1.59E+01                                                                                                                                                      3.94E-03 Co-60                                                                                              7.55E-02                                                                                                      1.06E+00                                                                                                                                                      7.12E-02 8105X                            FR-GSSX-013                                   Cs-137                                                                                                           2.54E-01                                                                                                      3.65E+00                                                                                                                                                      6.96E-02 0.14661 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                                9.22E-02                                                                                                      1.59E+01                                                                                                                                                      5.80E-03 Co-60                                                                                              4.58E-03                                                                                                      1.06E+00                                                                                                                                                      4.32E-03 8105X                            FR-GSSX-014                                   Cs-137                              1.69E-01                                     3.65E+00                                                                                                                                                   4.63E-02 0.06911 Eu-152                                                                                                     0.00E+00                                                                                                                                       2.36E+00                                                                                                                                               0.00E+00 C-14                                                                                                                                                2.94E-01                                                                                                      1.59E+01                                                                                                                                                   1.85E-02 Note: Bold values indicate concentrations greater than MDC.

Table 7 Basic Statistical Properties of  Random Sample Populationand Survey Unit Dose Mean                            Median                                 Max                                 Min                         Std. Dev.                           BcDCGL                                        Avg ROC                          (pCi/g)                            (pCi/g)                           (pCi/g)                             (pCi/g)                            (pCi/g)                             (pCi/g)                          BcSOF per                                  Avg Dose ROC                               per ROC Co-60                       6.51E-02                           6.84E-02                          1.58E-01                          0.00E+00                             5.33E-02                           3.77E+00                                1.73E-02                                4.32E-01 Cs-137                        1.79E-01                           1.71E-01                          3.12E-01                           6.28E-02                            7.00E-02                           1.31E+01                                1.36E-02                                3.41E-01 Eu-152                        4.66E-02                          0.00E+00                           2.18E-01                          0.00E+00                             7.99E-02                           8.41E+00                                5.54E-03                                1.38E-01 C-14                       1.33E-01                           3.90E-02                          8.56E-01                          0.00E+00                             2.30E-01                           5.70E+01                                2.34E-03                                5.85E-02 Mean base case sum of fractions                                                                 (BcSOF) = 0.0388 DOSE ASSIGNED TO SURVEY UNIT =                                                                                             0.9697 mrem/yr

The on-site laboratory analyzed the 23 judgmental soil samples using the on                                     -site gamma spectroscopy system. A summary of the analytical results for the judgmental soil samples is provided in Table 7-4. Gamma spectroscopy results revealed that Cs-137 was positively identified in 21 judgmental sample                                                                                                s. No other ROCs were positively identified             . GEL Laboratories analyzed the 23 judgmental samples for                                                                         the HTD ROC C-14. C-14 was not detected in any of the 23 judgmental samples. The maximum OpSOF for judgmental samples is 0.                                                                  24707.

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Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples Measured                                                                                OpDCGL Sample ID                                                                                                                  ROC                                                                Activity                                                                                                                                                                Fraction of                                                                             OpSOF (pCi/g)                                                                                (pCi/g)                                                                          OpDCGL

Co-60                                                                                               8.35E-03                                                                                                      1.06E+00                                                                                                                                                      7.88E-03 8105X                            FJ-GSSX-015                                                                                                        Cs-137                                                                                                           2.66E-01                                                                                                      3.65E+00                                                                                                                                                      7.29E-02 0.09422 Eu-152                                                                                                          8.92E-03                                                                                                      2.36E+00                                                                                                                                                      3.78E-03 C-14                                                                                                                                                 1.54E-01                                                                                                      1.59E+01                                                                                                                                                      9.69E-03 Co-60                                                                                               6.10E-02                                                                                                      1.06E+00                                                                                                                                                      5.75E-02 8105X                            FJ-GSSX-016                                                                                                        Cs-137                                                                                                          1.48E-01                                                                                                                                             3.65E+00                                                                                                                                                      4.05E-02 0.09841 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                                 5.06E-03                                                                                                      1.59E+01                                                                                                                                                      3.18E-04 Co-60                                                                                               8.97E-02                                                                                                      1.06E+00                                                                                                                                                      8.46E-02 8105X                            FJ-GSSX-017                                                                                                        Cs-137                                                                                                          1.72E-01                                                                                                                                             3.65E+00                                                                                                                                                      4.71E-02 0.24707 Eu-152                                                                                                          2.68E-01                                                                                                      2.36E+00                                                                                                                                                      1.14E-01 C-14                                                                                                                                                 2.81E-02                                                                                                      1.59E+01                                                                                                                                                      1.77E-03 Co-60                                                                                               9.14E-02                                                                                                      1.06E+00                                                                                                                                                      8.62E-02 8105X                            FJ-GSSX-018                                                                                                        Cs-137                                                                                                          9.23E-02                                                                                                                                             3.65E+00                                                                                                                                                      2.53E-02 0.11478 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                                 5.20E-02                                                                                                      1.59E+01                                                                                                                                                      3.27E-03 Co-60                                                                                               6.66E-02                                                                                                      1.06E+00                                                                                                                                                      6.28E-02 8105X                            FJ-GSSX-019                                                                                                        Cs-137                                                                                                           2.41E-01                                                                                                      3.65E+00                                                                                                                                                      6.60E-02 0.16681 Eu-152                                                                                                          6.73E-02                                                                                                      2.36E+00                                                                                                                                                      2.85E-02 C-14                                                                                                                                                 1.50E-01                                                                                                      1.59E+01                                                                                                                                                      9.43E-03 Co-60                                                                                          0.00E+00                                                                                                                                         1.06E+00                                                                                                                                                 0.00E+00 8105X                            FJ-GSSX-020                                                                                                        Cs-137                                                                                                          1.86E-01                                                                                                                                             3.65E+00                                                                                                                                                      5.10E-02 0.05096 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                            0.00E+00                                                                                                                                         1.59E+01                                                                                                                                                 0.00E+00 Co-60                                                                                               1.02E-01                                                                                                      1.06E+00                                                                                                                                                      9.62E-02 Cs-137                                                                                                          1.48E-01                                                                                                                                             3.65E+00                                                                                                                                                      4.05E-02 8105X                            FJ-GSSX-021                                                                                                        Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 0.14640

C-14                                                                                                                                                 1.53E-01                                                                                                      1.59E+01                                                                                                                                                      9.62E-03

Co-60                                                                                               4.09E-02                                                                                                      1.06E+00                                                                                                                                                      3.86E-02 8105X                            FJ-GSSA-022                                                                                                        Cs-137                                                                                                          1.17E-01                                                                                                                                             3.65E+00                                                                                                                                                      3.21E-02 0.07705 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00

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Measured                                                                                    OpDCGL Sample ID                                                                                                                        ROC                                                                   Activity                                                                                                                                                                        Fraction of                                                                                 OpSOF (pCi/g)                                                                                    (pCi/g)                                                                               OpDCGL

C-14                                                                                                                                                 1.02E-01                                                                                                      1.59E+01                                                                                                                                                      6.42E-03 Co-60                                                                                          0.00E+00                                                                                                                                         1.06E+00                                                                                                                                                 0.00E+00 8105X                            FJ-GSSX-023                                                                                                                Cs-137                                                                                                          8.57E-02                                                                                                                                             3.65E+00                                                                                                                                                      2.35E-02 0.06674 Eu-152                                                                                                          9.10E-02                                                                                                      2.36E+00                                                                                                                                                      3.86E-02 C-14                                                                                                                                                 7.48E-02                                                                                                      1.59E+01                                                                                                                                                      4.70E-03 Co-60                                                                                               1.03E-01                                                                                                      1.06E+00                                                                                                                                                      9.72E-02 8105X                            FJ-GSSX-024                                                                                                                Cs-137                                                                                                          5.59E-02                                                                                                                                             3.65E+00                                                                                                                                                      1.53E-02 0.11248 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                            0.00E+00                                                                                                                                         1.59E+01                                                                                                                                                 0.00E+00 Co-60                                                                                               6.05E-02                                                                                                      1.06E+00                                                                                                                                                      5.71E-02 8105X                            FJ-GSSX-025                                                                                                                Cs-137                                                                                                          1.38E-01                                                                                                                                             3.65E+00                                                                                                                                                      3.78E-02 0.10344 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                                 1.36E-01                                                                                                      1.59E+01                                                                                                                                                      8.55E-03 Co-60                                                                                               1.17E-01                                                                                                      1.06E+00                                                                                                                                                      1.10E-01 8105X                            FJ-GSSX-026                                                                                                                Cs-137                                                                                                          1.65E-01                                                                                                                                             3.65E+00                                                                                                                                                      4.52E-02 0.18326 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                                 4.40E-01                                                                                                      1.59E+01                                                                                                                                                      2.77E-02 Co-60                                                                                               6.10E-02                                                                                                      1.06E+00                                                                                                                                                      5.75E-02 8105X                            FJ-GSSX-027                                                                                                                Cs-137                                                                                                          1.93E-01                                                                                                                                             3.65E+00                                                                                                                                                      5.29E-02 0.13363 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                                 3.69E-01                                                                                                      1.59E+01                                                                                                                                                      2.32E-02 Co-60                                                                                               9.84E-02                                                                                                      1.06E+00                                                                                                                                                      9.28E-02 8105X                            FJ-GSSX-028                                                                                                                Cs-137                                                                                                          1.93E-01                                                                                                                                             3.65E+00                                                                                                                                                      5.29E-02 0.16143 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                                 2.50E-01                                                                                                      1.59E+01                                                                                                                                                      1.57E-02 Co-60                                                                                               7.28E-02                                                                                                      1.06E+00                                                                                                                                                      6.87E-02 Cs-137                                                                                                          1.84E-01                                                                                                                                             3.65E+00                                                                                                                                                      5.04E-02 8105X                            FJ-GSSX-029                                                                                                                Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 0.12157

C-14                                                                                                                                                 3.95E-02                                                                                                      1.59E+01                                                                                                                                                      2.48E-03

Co-60                                                                                               1.85E-02                                                                                                      1.06E+00                                                                                                                                                      1.75E-02 8105X                            FJ-GSSX-030                                                                                                                Cs-137                                                                   1.99E-01                                                                                  3.65E+00                                                                                                                                                   5.45E-02                 0.07197 Eu-152                                                                                                     0.00E+00                                                                                                                                       2.36E+00                                                                                                                                               0.00E+00

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Measured                                                                         OpDCGL Sample ID                                                                                                         ROC                                                           Activity                                                                                                                                                   Fraction of                                                                       OpSOF (pCi/g)                                                                          (pCi/g)                                                                     OpDCGL

C-14                                                                                                                                            0.00E+00                                                                                                                                         1.59E+01                                                                                                                                                 0.00E+00 Co-60                                                                                               3.22E-02                                                                                                      1.06E+00                                                                                                                                                      3.04E-02 8105X                            FJ-GSSX-031                                                                                             Cs-137                                                                                                          1.31E-01                                                                                                                                             3.65E+00                                                                                                                                                      3.59E-02 0.15956 Eu-152                                                                                                          1.85E-01                                                                                                      2.36E+00                                                                                                                                                      7.84E-02 C-14                                                                                                                                                 2.37E-01                                                                                                      1.59E+01                                                                                                                                                      1.49E-02 Co-60                                                                                          0.00E+00                                                                                                                                         1.06E+00                                                                                                                                                 0.00E+00 8105X                            FJ-GSSX-032                                                                                             Cs-137                                                                                                          2.31E-01                                                                                                                                             3.65E+00                                                                                                                                                      6.33E-02 0.10561 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                                 6.73E-01                                                                                                      1.59E+01                                                                                                                                                      4.23E-02 Co-60                                                                                               6.40E-02                                                                                                      1.06E+00                                                                                                                                                      6.04E-02 8105X                            FJ-GSSX-033                                                                                             Cs-137                                                                                                          1.86E-01                                                                                                                                             3.65E+00                                                                                                                                                      5.10E-02 0.12568 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                                 2.28E-01                                                                                                      1.59E+01                                                                                                                                                      1.43E-02 Co-60                                                                                               8.60E-02                                                                                                      1.06E+00                                                                                                                                                      8.11E-02 8105X                            FJ-GSSX-034                                                                                             Cs-137                                                                                                          1.56E-01                                                                                                                                             3.65E+00                                                                                                                                                      4.27E-02 0.20073 Eu-152                                                                                                          1.80E-01                                                                                                      2.36E+00                                                                                                                                                      7.63E-02 C-14                                                                                                                                                 9.35E-03                                                                                                      1.59E+01                                                                                                                                                      5.88E-04 Co-60                                                                                               6.44E-02                                                                                                      1.06E+00                                                                                                                                                      6.08E-02 8105X                            FJ-GSSX-035                                                                                             Cs-137                                                                                                          7.64E-02                                                                                                                                             3.65E+00                                                                                                                                                      2.09E-02 0.08169 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                            0.00E+00                                                                                                                                         1.59E+01                                                                                                                                                 0.00E+00 Co-60                                                                                               4.01E-02                                                                                                      1.06E+00                                                                                                                                                      3.78E-02 8105X                            FJ-GSSX-036                                                                                             Cs-137                                                                                                          1.71E-01                                                                                                                                             3.65E+00                                                                                                                                                      4.68E-02 0.08468 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                            0.00E+00                                                                                                                                         1.59E+01                                                                                                                                                 0.00E+00 Co-60                                                                                               1.43E-01                                                                                                      1.06E+00                                                                                                                                                      1.35E-01 8105X                            FJ-GSSX-037                                                                                             Cs-137                                                                                                          1.51E-01                                                                                                                                             3.65E+00                                                                                                                                                      4.14E-02 0.17628 Eu-152                                                                                                     0.00E+00                                                                                                                                         2.36E+00                                                                                                                                                 0.00E+00 C-14                                                                                                                                            0.00E+00                                                                                                                                         1.59E+01                                                                                                                                                 0.00E+00 Note: Bold values indicate concentrations greater than MDC.

The implementation of survey specific QC measures included the collection of four             sample           s (8105X-3-FR-GSSB-002, 8105X-3-FQ-GSSX-014, 8105X-3-FJ-GSSB-022, and 8105X-3-FQ-GSSX-033) for split                                                                         or duplicate             sample analysis. The on-site laboratory  analyzed the QC

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samples using the on-                     site gamma spectroscopy system. A summary of the analytical results for the QC samples is provided in Table                                                          7-5. Cs                                                -137 was positively identified in              two QC sample           s.
The maximum OpSOF for QC samples is 0.28797.

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples

Sample ID                                       ROC                       Activity                           OpDCGL                                     Fraction of                                OpSOF (pCi/g)                              (pCi/g)                                  OpDCGL

Co-60                     5.30E-02                                                                                                            1.06E+00                                                                                                                                                                                                                   0.05000 8105X                            FR-GSSB-            Cs-137                     2.18E-01                            3.65E+00                                       0.05973 002                                  Eu-152                    0.00E+00                                                                                                                                               2.36E+00                                                                                                                                                                                                                   0.00000  0.10973 C-14                    0.00E+00                                                                                                                                               1.59E+01                                                                                                                                                                                                                   0.00000 Co-60                     7.84E-02                            1.06E+00                                       0.07396 8105X                            FQ-GSSX-            Cs-137                     3.01E-01                                                                                                            3.65E+00                                                                                                                                                                                                                   0.08247 014                                  Eu-152                    0.00E+00                             2.36E+00                                       0.00000                                0.15643 C-14                    0.00E+00                                                                                                                                               1.59E+01                                                                                                                                                                                                                   0.00000 Co-60                     1.94E-01                            1.06E+00                                       0.18302 Cs-137                     1.48E-01                            3.65E+00                                                                                                                                                                                                                0.04055 8105X                            FJ-GSSB-022            Eu-152                     1.52E-01                            2.36E+00                                       0.06441                                0.28797 C-14                    0.00E+00                                                                                                                                             1.59E+01                                                                                                                                                                                                                0.00000 Co-60                     1.03E-01                                                                                                            1.06E+00                                                                                                                                                                                                                0.09717 8105X                            FQ-GSSX-            Cs-137                     1.70E-01                                                                                                                                                   3.65E+00                                                                                                                                                                                                                   0.04658 033                                  Eu-152                    0.00E+00                             2.36E+00                                       0.00000                                0.14375 C-14                    0.00E+00                             1.59E+01                                       0.00000 Note: Bold values indicate concentrations greater than MDC.
: 8.                                                          QUALITY CONTROL

The on-site laboratory processed four            split             and duplicate samples             (8105X-3-FRGSSB-002, 8105X-3-FQ-GSSX-014, 8105X-3-FJ-GSSB-022, and 8105X-3-FQ-GSSX-033)                                                                         using gamma spectroscopy analysis. The data was evaluated using  acceptance criteria specified in             NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual (Reference             13) as detailed in Section 5.6.3.2 of the LTP. There was acceptable agreement between standard and comparison sample results in both                               caseswhere assessments were necessary per the QAPP. Refer to Attachment 4 for data and QCanalysis results.

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: 9.                                                          INVESTIGATIONS AND RESULTS

During the FSS of Survey Unit 8105, areas                                                                                                                                     with a +3 sigma/alarms were investigated. Twenty-three judgmental samples were collected for investigation, all with radiological   concentrations below the OpDCGL.
: 10.                              REMEDIATION AND RESULTS

No radiological remedial action as described by MARSSIM Section 5.4 was performed in  Survey Unit 8105 prior to or as a result of the FSS. Chapter 4 of the LTP                                                                                                                           determined that remediation beyond that required to meet the release criteria is unnecessary and the remaining residual radioactivity in soil was ALARA.
: 11.                              CHANGES FROM THE FINAL STATUS SURVEY PLAN

There were no addendums to the FSS plan.
: 12.                              DATA QUALITY ASSESSMENT

The DQO sample design and data were reviewed in accordance with  FCSD-RA-                                                                  LT-304,                                                           Final Status Survey Data Assessment (Reference             14) for completeness and consistency.
Documentation was complete and legible. Surveys and the collection of samples            were consistent with the DQOs and were sufficient to ensure that the survey unit was properly designated as Class
: 3. The survey design had adequate power as indicated by the retrospective power curve (see , Figure 16-5).
The measurement results indicated that all sampleswere less than a SOF of                                                      1 when compared to the OpDCGLs.
Although MARSSIM states that the Sign Test need not be performed in the instance that no measurements surpass the OpDCGL, the test was conducted to demonstrate ad            herence to the statistical principles of the DQO process. The Sign Test was performed on the data and compared to the original assumptions of the DQOs. The evaluation of the Sign Test results clearly demonstrates that Survey Unit 8105 passes the unrestricted release criteria, thus, the null hypothesis is rejected. The results of the Sign Test are presented in Attachment              3.
The preliminary data review consisted of calculating basic statistical quantities (e.g., mean, median, standard deviation). All data was considered valid including negative values, zeros, and values reported below the MDC. The mean and median values for each ROC were well below the respective OpDCGLs. Also, the retrospective power curve shows that  enough samples were

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collected to achieve the desired power  ; therefore, Survey Unit 8105 meets the unrestricted release criteria with adequate power as required by the DQOs.
The mean of all identified isotopes is less than the Consultation Triggers for Residential Soil Concentration depicted in Table H.1 of NUREG 1757, Vol.1, Rev. 2 (Memorandum of Understanding Table 1). The full table is included in Attachment 5 of this release record.
The data for Cs-137 is                                                                                     presented graphically through a                                                                                     frequency plot and quantile plot. All graphical presentations are provided in Attachment  6.
: 13.                              ANOMALIES

No anomalies were observed during the performance or analyses of the survey.
: 14.                              CONCLUSION

Survey Unit 8105has met the DQOs of the FSS plan. The ALARA criteria as specified in Chapter 4 of the LTP were achieved. The elevated measurement comparison for soils was not applicable and remediation was not required.
All identified ROCs were used for statistical testing to determine the adequacy of              Survey Unit 8105 for FSS. Evaluation of the data shows that none of the random ROC concentration values exceeds the OpDCGLs; therefore, in accordance with LTP Section 5 .2.6, the survey unit meets the release criteria.
The sample data passed the Sign Test. The null hypothesis was rejected. The  retrospective power curve showed that adequate power was achieved.             Survey Unit 8105 is properly classified as Class 3.
The dose contribution from soil in Survey Unit 8105 is                                                                                     0.9697 mrem/yr TEDE, based on the average concentration of the ROCs in samples used for nonparametric statistical             testing.
Survey Unit 8105is acceptable for unrestricted release.
: 15.                              REFERENCES
: 1.                                                                                                                                   FCSD-RA-LT-305, Final Status Survey Data Reporting
: 2.                                                                                                                                   Fort Calhoun Station Decommissioning Project License Termination Plan
: 3.                                                                                                                                   FCSD-RA-LT-302, Final Status Survey Sample Plan Development
: 4.                                                                                                                                   NUREG-1575, Revision 1,                                   Multi-Agency Radiation Survey and Site Investigation Manual

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: 5.                                                                                                                                   TSD 20-001, Historical Site Assessment for Fort Calhoun Station
: 6.                                                                                                                                   TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan
: 7.                                                                                                                                   NUREG-1757, Volume 2, Revision 2,                                    Consolidated Decommissioning Guidance -
Characterization, Survey, and Determination of Radiological Criteria   - Draft Report for Comment
: 8.                                                                                                                                   FCSD-RA-LT-100,                                                           Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station
: 9.                                                                                                                                   FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors
: 10.                                                                                                                                   FCSD-RA-LT-205,                                                           Chain-of-Custody Protocol for Site Characterization and Final Status Survey
: 11.                                                                                                                                   FCSD-RA-LT-203,                                                           Sample Media Collection for Site Characterization and Final Status Survey
: 12.                                                                                                                                   FCSD-RA-LT-204,                                                           Sample Media Preparation for Site Characterization and Final Status Survey
: 13.                                                                                                                                   NUREG-1576,                                   Multi-Agency Radiological Laboratory Analytical Protocols Manual
: 14.                                                                                                                                   FCSD-RA-LT-304,                                                           Final Status Survey Data Assessment
: 16.                              ATTACHMENTS

Attachment 1 - Figures Attachment 2 - Scan Data Attachment 3 - Sign Test Attachment 4 - Quality Control Assessment Attachment 5 - Consultation Triggers for Residential Soil Concentrations Attachment 6 - Graphical Presentations

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ATTACHMENT 1 - FIGURES

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Figure 16                                                                 Survey Unit 8105 Scan and Judgmental Locations Maps

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Figure 16 Scan and Random Locations Map

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ATTACHMENT 2 - SCAN DATA

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Table 16 Survey Unit 8105 Complete Scan Data Min Scan                                                                                      Max Scan                                                                                                                   Avg                                                                               Action                                                                              Scan Detector                                                                                         Detector                                                                                       M3001                                                                          Survey                                                                                                                                                        Logged                                                                                          Logged                                                                                 Background                                                                                                       Level                                                               Alarms?
Type                                                                                                      ID                                                                                        ID                                                                      Unit                                                       Location                                                                                      Result                                                                                          Result                                                                                                   (cpm)                                                                                     (cpm)                                                                        (Y/N)
(cpm)                                                                                           (cpm) 44-20                                                                            PR404738                                                                                    25021210                                                                                        8105                                                                                    1                                                                                                                              22301                                                                                                                                  32993                                                                                                                                                  29580                                                                                                                     31081                                                                                                                           Y 44-20                                                                            PR404738                                                                                    25021210                                                                                        8105                                                                                    2                                                                                                                                         4322                                                                                                                                                                                    31846                                                                                                                                                  28740                                                                                                                     30220                                                                                                                           Y 44-20                                                                            PR403795                                                                                    25021219                                                                                        8105                                                                                    3                                                                                                                              19952                                                                                                                                  34568                                                                                                                                                  30880                                                                                                                     32414                                                                                                                           Y 44-20                                                                            PR404738                                                                                    25021210                                                                                        8105                                                                                    4                                                                                                                              27276                                                                                                                                  33403                                                                                                                                                  29900                                                                                                                     31409                                                                                                                           Y 44-20                                                                            PR403795                                                                                    25021219                                                                                        8105                                                                                    5                                                                                                                              22825                                                                                                                                  32324                                                                                                                                                  28780                                                                                                                     30261                                                                                                                           Y 44-20                                                                            PR403795                                                                                    25021219                                                                                        8105                                                                                    6                                                                                                                              26363                                                                                                                                  32797                                                                                                                                                  29560                                                                                                                     31061                                                                                                                           Y 44-20                                                                            PR404738                                                                                    25021210                                                                                        8105                                                                                    7                                                                                                                              18613                                                                                                                                  34867                                                                                                                                                  31180                                                                                                                     32721                                                                                                                           Y 44-20                                                                            PR403795                                                                                    25021219                                                                                        8105                                                                                    8                                                                                                                              19371                                                                                                                                  33297                                                                                                                                                  30400                                                                                                                     31922                                                                                                                           Y 44-20                                                                            PR404738                                                                                    25021210                                                                                        8105                                                                                    9                                                                                                                              16441                                                                                                                                  33619                                                                                                                                                  20580                                                                                                                     32106                                                                                                                           Y 44-20                                                                            PR403795                                                                                    25021219                                                                                        8105                                                                                10                                                                                                                    17407                                                                                                                                  33016                                                                                                                                                  30460                                                                                                                     31983                                                                                                                           Y 44-20                                                                            PR397732                                                                                    25021209                                                                                        8105                                                                                11                                                                                                                    23203                                                                                                                                  36562                                                                                                                                                  28940                                                                                                                     30425                                                                                                                           Y 44-20                                                                            PR403795                                                                                    25021219                                                                                        8105                                                                                12                                                                                                                    23377                                                                                                                                  31828                                                                                                                                                  29100                                                                                                                     30589                                                                                                                           Y 44-20                                                                            PR404738                                                                                    25021210                                                                                        8105                                                                                13                                                                                                                    19016                                                                                                                                  31082                                                                                                                                                  28580                                                                                                                     30056                                                                                                                           Y 44-20                                                                            PR403795                                                                                    25021219                                                                                        8105                                                                                14                                                                                                                    25466                                                                                                                                  31049                                                                                                                                                  28140                                                                                                                     29604                                                                                                                           Y 44-20                                                                            PR404738                                                                                    25021210                                                                                        8105                                                                                15                                                                                                                    19020                                                                                                                                  30780                                                                                                                                                  29100                                                                                                                     30589                                                                                                                           Y 44-20                                                                            PR404738                                                                                    25021210                                                                                        8105                                                                         14Q                                                                                                                                                       19090                                                                                                                                  32586                                                                                                                                                  29600                                                                                                                     31102                                                                                                                           Y 44-20                                                                            PR397732                                                                                    25021209                                                                                        8105                                                                                16                                                                                                                                                                                                                                                                                                                              32500 44-20                                                                            PR397733                                                                                    25021210                                                                                        8105                                                                                17                                                                                                                                                                                                                                                                                                                              32300 44-20                                                                            PR397734                                                                                    25021211                                                                                        8105                                                                                18                                                                                                                                                                                                                                                                                                                              33400 44-20                                                                            PR397735                                                                                    25021212                                                                                        8105                                                                                19                                                                                                                                                                                                                                                                                                                              33700 44-20                                                                            PR397736                                                                                    25021213                                                                                        8105                                                                                20                                                                                                                                                                                                                                                                                                                              32900 44-20                                                                            PR397737                                                                                    25021214                                                                                        8105                                                                                21                                                                                                                                                                                                                                                                                                                              33600 44-20                                                                            PR397738                                                                                    25021215                                                                                        8105                                                                                22                                                                                                                                                                                                                                                                                                                              34700 44-20                                                                            PR397739                                                                                    25021216                                                                                        8105                                                                                23                                                                                                                                                                                                                                                                                                                              33200 44-20                                                                            PR397740                                                                                    25021217                                                                                        8105                                                                                24                                                                                                                                                                                                                                                                                                                              33500 44-20                                                                            PR397741                                                                                    25021218                                                                                        8105                                                                                25                                                                                                                                                                                                                                                                                                                              32600 44-20                                                                            PR397742                                                                                    25021219                                                                                        8105                                                                                26                                                                                                                                                                                                                                                                                                                              33700 44-20                                                                            PR397743                                                                                    25021220                                                                                        8105                                                                                27                                                                                                                                                                                                                                                                                                                              33200 44-20                                                                            PR397744                                                                                    25021221                                                                                        8105                                                                                28                                                                                                                                                                                                                                                                                                                              34200 44-20                                                                            PR397745                                                                                    25021222                                                                                        8105                                                                                29                                                                                                                                                                                                                                                                                                                              33600 44-20                                                                            PR397746                                                                                    25021223                                                                                        8105                                                                                30                                                                                                                                                                                                                                                                                                                              32800 44-20                                                                            PR397747                                                                                    25021224                                                                                        8105                                                                                31                                                                                                                                                                                                                                                                                                                              32500 44-20                                                                            PR397748                                                                                    25021225                                                                                        8105                                                                                32                                                                                                                                                                                                                                                                                                                              33500

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44-20                                                                 PR397749                                                                        25021226                                                                            8105                                                                    33                                                                                                                                                                                                                                                                                                                              33500 44-20                                                                 PR397750                                                                        25021227                                                                            8105                                                                    34                                                                                                                                                                                                                                                                                                                              33900 44-20                                                                 PR397751                                                                        25021228                                                                            8105                                                                    35                                                                                                                                                                                                                                                                                                                              34200 44-20                                                                 PR397752                                                                        25021229                                                                            8105                                                                    36                                                                                                                                                                                                                                                                                                                              33100 44-20                                                                 PR397753                                                                        25021230                                                                            8105                                                                    37                                                                                                                                                                                                                                                                                                                              33700 Areas above three (3) standard deviations were scanned for verification of original scans prior to judgmental sample collection.

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ATTACHMENT 3 - SIGN TEST

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Table 16 Survey Unit                                                                        8105 Sign Test
                                    #             SOF           1-Ws            Sign (Ws) 1          0.12003           0.88            +1 2          0.19715           0.80            +1 3          0.08887           0.91            +1 4          0.09614           0.90            +1 5          0.13002           0.87            +1 6          0.06404           0.94            +1 7          0.19423           0.81            +1 8          0.10246           0.90            +1 9          0.18454           0.82            +1 10         0.24748           0.75            +1 11         0.21308           0.79            +1 12         0.08531           0.91            +1 13         0.14661           0.85            +1 14         0.06911           0.93            +1 Number of positive differences (S+)                           14

Critical Value           10

Survey Unit                Meets the Acceptance Criteria

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ATTACHMENT 4 - QUALITY CONTROL ASSESSMENT

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Table 16 Survey Unit                                                                        8105 QC Assessment

6XU YH \\  $ U H M                                                        6XU YH \\  8 QLW                                       6XU YH \\  8 QLW  1 M PH                                                                                                                                                1 RU WK  2 R QH U   & RQWU ROOH G  $ U H M

Sample Plan #:                                                            8105

Sa mple   D e s c ription:    Compa ris on  of  s plit  s a mple s   c olle c te d  from  s urfa c e   s oil  s a mple s   from  loc a tion  # 22  a nd  # 33  w e re   a na lyze d  us ing  ga mma   s pe c tros c opy  by  on-s ite   H P  Ge   Sys te m.

Sta nda rd  ID                     A  c  t iv it y    V  a  lu e   Sta nda rd  Error      A  c  t iv it y    V  a  lu e   Sta nda rd                           $EVROXWH               53'                  Tr e nd ing           $FFHSWMEOH" (Sta nda rd)                                        (Compa ris on)                  Error                               'LIIHUHQFH                                Assessment?
8105X-3-FJ -GSSA -022                                                             1. 17E-01                                                                             3. 89E-02                                                                                     1. 48E-01                                                             3. 85E-02                                 1. 33E-01                                   3. 10E-02                              N/A                                                                                                                             Y                                                                                                                                                             Y 8105X-3-FJ -GSSX-033                                                             1. 86E-01                                                                             4. 75E-02                                                                                     1. 70E-01                                                             4. 87E-02                                 1. 78E-01                                   1. 60E-02                              N/A                                                                                                                             Y                                                                                                                                                             YGui dance  fr om Se ct i on C.4 .2 .2  of M A R LA P

UBGR (C s -137 O pDC GL) = 3.65 pC i/g LBGR  (Mean  C s -137Activity)  =  0.1786  pC i/g Width of the Gray Region () = 3.4714 pCi/g Max Standard Uncertainty (&#xb5;MR) = /10 = 0.3471 pCi/g Comments/Corrective Actions:  Both samples reported Cs- 137 as a detect. There was acceptable agreement between the sample results. No further                                                                                                                                  Max Relative Standard Uncertainty (MR) = 0.0951 action is necessary.                                                                                                                                  Average Concentration of the two meas ured res ults  < UBGR:
Warning   Limit  =  2.83  &#xb5;MR  =  0.9824  pC i/g C ontrol  Limit  =  4.24  &#xb5;MR  =  1.4719  pC i/g Average Concentration of the two meas ured res ults  > UBGR:
Warning   Limit  =  2.83  MR  x  100%  =  26.92%
C ontrol  Limit  =  4.24  MR  x  100%  =  40.33%

P  e rforme d  by:                                M it c  h e  ll   U  z                                 Date:                                                                                                         Re vie w e d  by:                                 GMWH

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ATTACHMENT 5 - CONSULTATION TRIGGERS FOR RESIDENTIAL SOIL CONCENTRATION

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ATTACHMENT 6 - GRAPHICAL PRESENTATIONS

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Figure 16 Quantile Plot for Cs                                                -137 Concentration Quantile Plot For Cs                                                                                      -137

3.50E-01

3.00E-01

2.50E-01

2.00E-01

1.50E-01

1.00E-01

5.00E-02

0.00E+00 0%                                                                                              10%                                                                                    20%                                                                                    30%                                                                                    40%                                                                                    50%                                                                                    60%                                                                                    70%                                                                                    80%                                                                                    90%                                                                          100%

PERCENTAGE

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Figure 16 Histogram for Cs            -137 Concentration Frequency Plot For Cs                                                                                                                                       -137

10 9
8 7
6 5
4 3
2 1
0 1.15E-01                                                                                                                                                1.67E-01                                                                                                                                                2.19E-01                                                                                                                                                2.71E-01                                                                                                                                                3.23E-01                                                                                                                                                3.75E-01

UPPER END VALUE (PCI/G)

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Figure 16 Retrospective Power Curve for Survey Unit 8105

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FORT CALHOUN STATION FINAL STATUS SURVEY RELEASE RECORD

SURVEY UNIT 8106 NORTH OWNER CONTROLLED AREA

REVISION 0

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8106 NORTH OWNER CONTROLLED AREA

PREPARED BY / DATE:
M. Bryant, LT/FSS Specialist

REVIEWED BY / DATE:
M. Uz, LT/FSS Specialist

REVIEWED BY /    DATE:
A. Barker Regulatory Assurance & Emergency Planning Manager

REVIEWED BY / DATE:
D. Whisler Manager Radiation Protection & Chemistry

APPROVED BY / DATE:
B. Bishop, LT/FSS Manager

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TABLE OF CONTENTS
: 1. EXECUTIVE 

==SUMMARY==
................................................................................................................... 8
: 2. SURVEY UNIT DESCRIPTION ........................................................................................................ 8
: 3. CLASSIFICATION BASIS .................................................................................................................. 8
: 4. DATA QUALITY OBJECTIVES ..................................................................................................... 14
: 5. SURVEY DESIGN .............................................................................................................................. 17
: 6. SURVEY IMPLEMENTATION ....................................................................................................... 21
: 7. SURVEY RESULTS ........................................................................................................................... 22
: 8. QUALITY CONTROL ....................................................................................................................... 60
: 9. INVESTIGATIONS AND RESULTS ............................................................................................... 61
: 10. REMEDIATION AND RESULTS .................................................................................................... 61
: 11. CHANGES FROM THE FINAL STATUS SURVEY PLAN ......................................................... 61
: 12. DATA QUALITY ASSESSMENT .................................................................................................... 61
: 13. ANOMALIES ...................................................................................................................................... 62
: 14. CONCLUSION ................................................................................................................................... 62
: 15. REFERENCES .................................................................................................................................... 63
: 16. ATTACHMENTS ............................................................................................................................... 64

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LIST OF TABLES

Table 3 Statistical Quantities for Cs-137, Co-60, from the Characterization Survey of 8105 ......... 9 Table 3 Off-Site Analysis for Characterization Samples in Survey Area 8100 ................................. 9 Table 3 Statistical Quantities for Cs-137 and Co-60 from the Firing Range RA ............................ 11 Table 3 Off-Site Analysis for Firing Range RA .................................................................................. 12 Table 4 Base Case DCGLs for Soil ...................................................................................................... 16 Table 4 Operational DCGLs for Soil .................................................................................................. 17 Table 5 Action Levels for Survey Unit 8106 ....................................................................................... 18 Table 5 Random Sample Locations ..................................................................................................... 19 Table 5 Judgmental Sample Locations ............................................................................................... 20 Table 5 Investigation Levels ................................................................................................................ 20 Table 5 Synopsis of Survey Design ...................................................................................................... 20 Table 7 Synopsis of Scan Results ......................................................................................................... 23 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Random Samples ................................................................................................................................................ 56 Table 7 Basic Statistical Properties of Random Sample Population and Survey Unit Dose .......... 58 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples ................................................................................................................................................ 59 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples .. 60 Table 16 Survey Unit 8106 Complete Scan Data ............................................................................... 69 Table 16 Survey Unit 8106 Soil Samples Sign Test............................................................................ 71 Table 16 Duplicate Assessment Form ................................................................................................. 73

LIST OF FIGURES

Figure 7 Survey Unit 8106 Grid 1 GPS Scan Results ........................................................................ 24 Figure 7 Survey Unit 8106 Grid 1 Z-Score Map ................................................................................ 25 Figure 7 Survey Unit 8106 Grid 2 GPS Scan Results ........................................................................ 26 Figure7 Survey Unit 8106 Grid 2 Z-Score Map ................................................................................. 27 Figure 7 Survey Unit 8106 Grid 3 GPS Scan Results ........................................................................ 28 Figure 7 Survey Unit 8106 Grid 3 Z-Score Map ................................................................................ 29 Figure 7 Survey Unit 8106 Grid 4 GPS Scan Results ........................................................................ 30 Figure 7 Survey Unit 8106 Grid 4 Z-Score Map ................................................................................ 31 Figure 7 Survey Unit 8106 Grid 5 GPS Scan Results ........................................................................ 32 Figure 7 Survey Unit 8106 Grid 5 Z-Score Map .............................................................................. 33 Figure 7 Survey Unit 8106 Grid 6 GPS Scan Results ...................................................................... 34 Figure 7 Survey Unit 8106 Grid 6 Z-Score Map .............................................................................. 35 Figure 7 Survey Unit 8106 Grid 7 GPS Scan Results ...................................................................... 36 Figure 7 Survey Unit 8106 Grid 7 Z-Score Map .............................................................................. 37 Figure 7 Survey Unit 8106 Grid 7 QC GPS Scan Results ............................................................... 38

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Figure 7 Survey Unit 8106 Grid 7 QC Z-Score and Sample Map (Locations 20-21) ................... 39 Figure 7 Survey Unit 8106 Grid 8 GPS Scan Results ...................................................................... 40 Figure 7 Survey Unit 8106 Grid 8 Z-Score Map .............................................................................. 41 Figure 7 Survey Unit 8106 Grid 9 GPS Scan Results ...................................................................... 42 Figure 7 Survey Unit 8106 Grid 9 Z-Score Map .............................................................................. 43 Figure 7 Survey Unit 8106 Grid 10 GPS Scan Results .................................................................... 44 Figure 7 Survey Unit 8106 Grid 10 Z-Score Map ............................................................................ 45 Figure 7 Survey Unit 8106 Grid 11 GPS Scan Results .................................................................... 46 Figure 7 Survey Unit 8106 Grid 11 Z-Score Map ............................................................................ 47 Figure 7 Survey Unit 8106 Grid 12 GPS Scan Results .................................................................... 48 Figure 7 Survey Unit 8106 Grid 12 Z-Score Map ............................................................................ 49 Figure 7 Survey Unit 8106 Grid 13 GPS Scan Results .................................................................... 50 Figure 7 Survey Unit 8106 Grid 13 Z-Score and Sample Map (Locations 16-17) ........................ 51 Figure 7 Survey Unit 8106 Grid 14 GPS Scan Results .................................................................... 52 Figure 7 Survey Unit 8106 Grid 14 Z-Score and Sample Map (Locations 18-19) ........................ 53 Figure 7 Survey Unit 8106 Grid J15 GPS Scan Results .................................................................. 54 Figure 7 Survey Unit 8106 Grid J15 Z-Score and Sample Map (Location 15) ............................. 55 Figure 16 Survey Unit 8106 Random Sample Locations and Scan Areas ....................................... 66 Figure 16 Survey Unit 8106 Judgmental Sample Locations ............................................................. 67 Figure 16 Quantile Plot for Cs-137 Concentration ............................................................................ 77 Figure 16 Histogram for Cs-137 Concentration ................................................................................ 78 Figure 16 Retrospective Power Curvey for Survey Unit 8106 .......................................................... 79

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8106 NORTH OWNER CONTROLLED AREA

LIST OF ABBREVIATIONS

delta
/          relative shift sigma ALARA        as low as is reasonably achievable BcDCGL       base case derived concentration guideline level BcSOF        base case sum of fractions cpm          counts per minute DQA          data quality assessment DQO          data quality objective DCGL         derived concentration guideline level DCGLW        derived concentration guideline level wide area FCS          Fort Calhoun Station FSS          final status survey GPS          Global Positioning System HTD          hard-to-detect IC           insignificant contributor LBGR         lower bound of the gray region LT/FSS       License Termination/Final Status Survey LTP          license termination plan m            meter MARSSIM      Multi-Agency Radiation Survey and Site Investigation Manual MDC          minimum detectable concentration mrem/yr      millirem per year NaI          sodium iodide NRC          Nuclear Regulatory Commission OpDCGL       operational derived concentration guideline level pCi/g        picocuries per gram

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8106 NORTH OWNER CONTROLLED AREA

QAPP         quality assurance project plan QC           quality control RA           radiological assessment ROC          radionuclides of concern SOF          sum of fractions TEDE         total effective dose equivalent TSD          technical support document UBGR         upper bound of the gray region VSP          Visual Sample Plan

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8106 NORTH OWNER CONTROLLED AREA
: 1. EXECUTIVE 

==SUMMARY==

This final status survey (FSS) release record for Survey Unit 8106, North Owner Controlled Area, has been generated in accordance with procedure FCSD-RA-LT-305, Final Status Survey Data Reporting (Reference 1) and satisfies the requirements of Section 5.7.1 of the Fort Calhoun Station Decommissioning Project License Termination Plan (FCS; LTP; Reference 2).
An FSS sample plan for this survey unit was developed in accordance with procedure FCSD-RA-LT-302, Final Status Survey Sample Plan Development (Reference 3), the FCS LTP, and with guidance from NUREG-1575, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM; Reference 4).
Survey Unit 8106, an open land survey unit, has a MARSSIM classification of 3. A survey plan was designed based upon use of the Sign Test as the nonparametric statistical test for compliance.
Both the Type I () and Type II () decision error rates were set at 0.05. As a random sample population, 14 soil samples were acquired from the survey unit. In addition, soil scanning was performed on 10% of the total surface area in the survey unit. The analytical results for all soil samples, both random and judgmental, taken in Survey Unit 8106 indicate that the maximum sum of fractions (SOF), considering the concentration of all applicable radionuclides of concern (ROCs), is equal to 0.2199 when applying the respective operational derived concentration guideline levels (OpDCGLs) for soil. Therefore, the null hypothesis is rejected and Survey Unit 8106 is acceptable for unrestricted release. The mean SOF when applying the respective base case derived concentration guideline levels (BcDCGLs) for soil is 0.0277. This SOF equates to a dose for the survey unit of 0.6913 millirem per year (mrem/yr).
: 2. SURVEY UNIT DESCRIPTION

Survey Unit 8106 is an impacted Class 3 open land survey unit. The surface area of the survey unit is 99,788 meters (m)2.

The boundary of the survey unit and the location of the soil samples were defined using a Global Positioning System (GPS). Refer to Attachment 1 of this report for a figure depicting Survey Unit 8106.
: 3. CLASSIFICATION BASIS

Based on the historical use of this area for security training, with the presumption that if radioactivity is present, its concentration is a small fraction of the release criteria. Survey Unit 8106 was identified in the technical support document (TSD) 20-001, Historical Site Assessment for Fort Calhoun Station (Reference 5) as a Class 3 survey unit. The initial site characterization surveys were conducted between November 2019 and July 2020. The following summarizes the results of the characterization survey for Survey Unit 8106.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8106 NORTH OWNER CONTROLLED AREA

In total, 22 surface soil samples were collected in Survey Unit 8106. All samples from Survey Unit 8106 were analyzed by the on-site gamma spectroscopy system. Cs-137 was detected at concentrations above the minimum detectable concentration (MDC) in 11 samples. Co-60 was not detected at concentrations above MDC in any of the surface soil samples. A summary of the analyses for surface soil samples taken during site characterization are presented in Table 3-1.
No samples from Survey Unit 8106 were randomly selected to be sent for off-site analysis. A summary of the off-site analyses for Survey Area 8100 is presented in Table 3-2.

Table 3 Statistical Quantities for Cs-137, Co-60, from the Characterization Survey of 8105 Surface Soil           Co-60     Cs-137
                                 # of Samples                  22
                                   # >MDC                 0         11 Mean picocuries per gram (pCi/g) 3.21E-02 1.36E-01 Median (pCi/g)         3.17E-02  1.39E-01 Max (pCi/g)           8.24E-02  2.14E-01 Min (pCi/g)           0.00E+00  1.60E-02 Standard Deviation (pCi/g)  2.62E-02  4.49E-02

Table 3 Off-Site Analysis for Characterization Samples in Survey Area 8100 Radionuclides      8100X-3-CJ-        8100X-3-CJ-        8100X-3-CJ-        8100X-3-CR-GSSX-044           GSSX-058           GSSX-064           GSSX-003 Am-241             7.07E-02           2.72E-02           4.72E-02          0.00E+00 Sb-125            4.66E-02           2.70E-02           6.77E-02          0.00E+00 C-14             0.00E+00           1.37E-01           1.07E-01          0.00E+00 Ce-144            1.02E-01           0.00E+00           0.00E+00           7.80E-02 Cs-134            8.37E-02           1.87E-02           5.11E-02           4.36E-02 Cs-137            1.72E-01           1.80E-01           1.24E-01           1.29E-01 Co-57             4.55E-03           0.00E+00           6.78E-03          0.00E+00 Co-58             0.00E+00           1.75E-02           0.00E+00           4.06E-02 Co-60             0.00E+00           0.00E+00           0.00E+00           5.21E-03 Cm-242             0.00E+00           0.00E+00           2.57E-02          0.00E+00 Cm-243/244           0.00E+00           3.58E-02           9.67E-02           8.71E-03 Eu-152            6.02E-03           1.11E-03           8.78E-02          0.00E+00 Eu-154            0.00E+00           5.66E-03           1.29E-01          0.00E+00 Eu-155            7.90E-02           1.90E-02           1.79E-02           6.16E-02 Fe-55             2.18E+00           2.45E+00           4.43E+00          3.18E+00

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Radionuclides       8100X-3-CJ-        8100X-3-CJ-        8100X-3-CJ-        8100X-3-CR-GSSX-044           GSSX-058           GSSX-064            GSSX-003 Mn-54             7.75E-03            0.00E+00           1.94E-02            3.03E-02 Np-237            0.00E+00            0.00E+00           8.29E-04            1.12E-03 Ni-59            0.00E+00            0.00E+00           0.00E+00            1.39E-01 Ni-63            0.00E+00            0.00E+00           5.00E-01            4.13E-01 Nb-94             5.79E-02            3.37E-03           3.50E-02            8.78E-03 Pu-238            0.00E+00            2.85E-03           1.50E-02            4.90E-03 Pu-239/240          7.86E-03            1.35E-02           1.73E-02           0.00E+00 Pu-241            1.26E+00            1.36E+00           2.17E+00           0.00E+00 Ag-110m            2.08E-02            0.00E+00           7.33E-02           0.00E+00 Sr-90            1.33E-01            1.09E-01           1.33E-01            1.44E-01 Tc-99             0.00E+00            0.00E+00           0.00E+00           0.00E+00 H-3              0.00E+00            0.00E+00           0.00E+00           0.00E+00 Zn-65             7.12E-02            2.89E-03           8.45E-03            4.71E-03

Radionuclides       8100X-3-CR-         8100X-3-CR-        8100X-3-CR-        8100X-3-CR-GSSX-021            GSSX-027           GSSX-029           GSSX-038 Am-241             1.20E-02            1.26E-02           0.00E+00           0.00E+00 Sb-125             1.16E-01            2.24E-02           1.74E-03           1.22E-01 C-14              0.00E+00            4.79E-01           0.00E+00           2.73E-01 Ce-144             2.28E-01            7.07E-02           0.00E+00           2.41E-01 Cs-134             0.00E+00            4.96E-02           9.19E-02           0.00E+00 Cs-137             2.05E-01            3.08E-01           4.96E-01           1.41E-01 Co-57              2.37E-03           0.00E+00            5.95E-02           8.79E-03 Co-58              6.82E-02           0.00E+00            6.93E-02           4.28E-02 Co-60              2.29E-02            2.98E-02           0.00E+00           0.00E+00 Cm-242             0.00E+00           0.00E+00            0.00E+00           0.00E+00 Cm-243/244           2.23E-02            2.50E-02           1.20E-02           7.52E-03 Eu-152             0.00E+00           0.00E+00            2.82E-01           2.67E-02 Eu-154             3.91E-02            7.78E-02           7.35E-03           0.00E+00 Eu-155             4.19E-02            5.79E-02           6.79E-02           0.00E+00 Fe-55             1.88E+00           0.00E+00            2.30E+00           4.32E+00 Mn-54              3.95E-03            4.56E-02           0.00E+00           4.32E-03 Np-237             1.39E-03            1.89E-03           0.00E+00           0.00E+00 Ni-59             7.57E-01            7.73E-01           0.00E+00           1.17E+00 Ni-63             3.50E-01           0.00E+00            4.64E-01           4.66E-01 Nb-94              1.54E-02           0.00E+00            1.79E-01           0.00E+00

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Radionuclides      8100X-3-CR-        8100X-3-CR-        8100X-3-CR-        8100X-3-CR-GSSX-021           GSSX-027           GSSX-029          GSSX-038 Pu-238            0.00E+00           5.67E-03           1.90E-02           4.82E-03 Pu-239/240          2.29E-02           1.16E-02           9.91E-03           1.06E-02 Pu-241            0.00E+00           8.17E-01           1.76E+00           1.70E+00 Ag-110m            0.00E+00           0.00E+00           0.00E+00           6.39E-02 Sr-90             5.79E-02           0.00E+00           3.00E-02           0.00E+00 Tc-99             0.00E+00           0.00E+00           0.00E+00           6.42E-03 H-3              0.00E+00           0.00E+00           0.00E+00           0.00E+00 Zn-65             0.00E+00           0.00E+00           0.00E+00           0.00E+00 Note: Bold values indicate concentration greater than MDC. Unbold values indicate the value below MDC. All values in pCi/g.

Prior to the FSS of Survey Unit 8106, a Radiological Assessment (RA) was performed of the Firing Range. In total, 118 samples were collected during the RA of the Firing Range. All samples were analyzed by the on-site gamma spectroscopy system. Cs-137 was identified in one sample at concentrations above the MDC. No other ROC was identified. A summary of the analyses for samples taken during the Firing Range RA are presented in Table 3-3. Twelve samples were randomly selected to be sent for off-site analysis. A summary of the off-site analyses for the Firing Range RA are presented in Table 3-4.

Table 3 Statistical Quantities for Cs-137 and Co-60 from the Firing Range RA Surface Soil        Co-60     Cs-137
                                 # of Samples              118
                                  # >MDC               0          1 Mean (pCi/g)        6.10E-02  5.90E-02 Median (pCi/g)      4.66E-02  3.27E-02 Max (pCi/g)        2.23E-01  2.11E-01 Min (pCi/g)        0.00E+00  0.00E+00 Standard Deviation (pCi/g) 5.36E-02 6.06E-02

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Table 3 Off-Site Analysis for Firing Range RA Radionuclides       9003X-3-AJ-GSBX-       9003X-3-AJ-GSBX-       9003X-3-AJ-GSBX-004                    008                    026 Am-241                 0.00E+00               0.00E+00              0.00E+00 Sb-125                7.80E-03               0.00E+00               7.87E-02 C-14                 0.00E+00               0.00E+00              0.00E+00 Ce-144                2.52E-02               5.52E-02              0.00E+00 Cs-134                4.46E-02               7.32E-02               5.58E-02 Cs-137                2.53E-02               8.49E-03              0.00E+00 Co-58                 7.92E-03               6.69E-03               6.23E-03 Co-60                 0.00E+00               2.27E-04              0.00E+00 Cm-243/244              2.73E-02               7.41E-04               8.82E-03 Eu-152                0.00E+00               3.57E-02              0.00E+00 Eu-154                4.45E-02               3.69E-04               6.59E-02 Eu-155                2.82E-02               1.15E-01              0.00E+00 Fe-55                0.00E+00               0.00E+00              0.00E+00 Np-237                0.00E+00               0.00E+00              0.00E+00 Ni-59                0.00E+00               3.42E-01               2.63E-01 Ni-63                0.00E+00               9.35E-02              0.00E+00 Pu-238                6.10E-04               1.24E-03              0.00E+00 Pu-239/240              0.00E+00               0.00E+00              0.00E+00 Pu-241                1.12E+00               0.00E+00               7.04E-01 Sr-90                9.25E-02               3.51E-01              0.00E+00 Tc-99                 4.94E-01               3.83E-01               4.77E-02 H-3                  1.99E+00               5.77E+00              4.35E+00

Radionuclides       9003X-3-AJ-GSBX-       9003X-3-AJ-GSBX-       9003X-3-AI-GSBX-045                    047                    081 Am-241                 0.00E+00               0.00E+00               2.44E-02 Sb-125                6.34E-02               0.00E+00               1.63E-02 C-14                 0.00E+00               0.00E+00              0.00E+00 Ce-144                0.00E+00               0.00E+00               6.42E-02 Cs-134                6.79E-02               6.11E-02               1.09E-02 Cs-137                0.00E+00               6.36E-02               1.17E-02 Co-58                 2.30E-04               0.00E+00               1.98E-02 Co-60                 0.00E+00               1.07E-02               1.61E-02 Cm-243/244              0.00E+00               0.00E+00               3.32E-02 Eu-152                5.67E-02               2.57E-02              0.00E+00 Eu-154                0.00E+00               6.05E-03               1.03E-01

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Radionuclides       9003X-3-AJ-GSBX-       9003X-3-AJ-GSBX-       9003X-3-AI-GSBX-045                    047                    081 Eu-155                7.94E-02               6.26E-02               3.71E-02 Fe-55                0.00E+00               0.00E+00               0.00E+00 Np-237                0.00E+00               0.00E+00               0.00E+00 Ni-59                0.00E+00               0.00E+00               3.00E-01 Ni-63                3.08E-03               9.92E-01               2.72E-01 Pu-238                0.00E+00               5.56E-03               3.63E-04 Pu-239/240              0.00E+00               0.00E+00               0.00E+00 Pu-241                8.68E-01               0.00E+00               0.00E+00 Sr-90                6.91E-02               0.00E+00               1.76E-01 Tc-99                 0.00E+00               0.00E+00               0.00E+00 H-3                  3.52E+00               0.00E+00               3.82E+00

Radionuclides       9003X-3-AI-GSBX-       9003X-3-AI-GSBX-       9003X-3-AI-GSBX-086                    088                    092 Am-241                2.05E-02               2.32E-02               0.00E+00 Sb-125                1.08E-02               0.00E+00               0.00E+00 C-14                 0.00E+00               0.00E+00               0.00E+00 Ce-144                0.00E+00               0.00E+00               2.61E-02 Cs-134                0.00E+00               4.21E-02               0.00E+00 Cs-137                6.48E-03               2.00E-02               7.04E-02 Co-58                 0.00E+00               0.00E+00               0.00E+00 Co-60                 0.00E+00               1.71E-02               0.00E+00 Cm-243/244              9.46E-04               0.00E+00               0.00E+00 Eu-152                7.07E-02               0.00E+00               3.77E-02 Eu-154                0.00E+00               0.00E+00               2.10E-02 Eu-155                4.09E-02               6.25E-02               1.01E-01 Fe-55                0.00E+00               0.00E+00               0.00E+00 Np-237                0.00E+00               0.00E+00               0.00E+00 Ni-59                0.00E+00               9.36E-01               2.48E+00 Ni-63                1.94E-01               0.00E+00               3.22E-01 Pu-238                0.00E+00               2.67E-03               0.00E+00 Pu-239/240              5.27E-03               0.00E+00               0.00E+00 Pu-241                7.30E-01               0.00E+00               0.00E+00 Sr-90                7.14E-02               1.20E-01               2.84E-01 Tc-99                 0.00E+00               2.44E-01               5.84E-02 H-3                  1.80E+00               2.54E+00               5.62E+00

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Radionuclides       9003X-3-AI-GSBX-       9003X-3-AI-GSBX-      9003X-3-AI-GSBX-109                   113                   116 Am-241                1.78E-02               2.80E-02              3.62E-02 Sb-125               1.67E-02               6.83E-03              1.03E-01 C-14                0.00E+00              0.00E+00               0.00E+00 Ce-144               0.00E+00               4.20E-02              4.52E-02 Cs-134               0.00E+00               5.91E-02              9.14E-03 Cs-137               2.53E-02               2.30E-02              7.55E-02 Co-58                0.00E+00               2.21E-02              3.23E-02 Co-60                0.00E+00               1.35E-02              2.54E-02 Cm-243/244              5.49E-03               1.11E-02              0.00E+00 Eu-152               0.00E+00               1.30E-02              0.00E+00 Eu-154               5.58E-02               1.71E-02              1.37E-01 Eu-155               1.45E+00               1.24E-01              9.37E-02 Fe-55                0.00E+00              0.00E+00               0.00E+00 Np-237               0.00E+00               5.26E-03              1.35E-03 Ni-59                1.72E+00              0.00E+00               3.31E-01 Ni-63                0.00E+00              0.00E+00               1.65E-01 Pu-238               2.56E-03               2.28E-03              0.00E+00 Pu-239/240             0.00E+00              0.00E+00               9.93E-04 Pu-241               2.71E-01              0.00E+00               0.00E+00 Sr-90                2.00E-01               4.44E-02              4.88E-03 Tc-99                4.55E-02               3.51E-01              1.19E-01 H-3                 5.46E+00              4.07E+00               2.57E+00 Note: Bold values indicate concentration greater than MDC. Unbold values indicate the value below MDC. All values in pCi/g.

Based upon a review of the historical information, the results of the characterization survey data and RA data, and completion of a Survey Unit Classification Worksheet, the correct final classification of Survey Unit 8106 was determined to be Class 3.
: 4. DATA QUALITY OBJECTIVES

FSS planning and design rely on a properly executed data quality objective (DQO) process to ensure, through compliance with explicitly defined inputs and boundaries, that the primary objective of the survey is satisfied. The DQO process, utilized in accordance with MARSSIM, is described in the FCS LTP. The appropriate design for a given survey was developed using the DQO process as outlined in Appendix D of MARSSIM. The seven steps of the DQO process are outlined in the following paragraphs.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8106 NORTH OWNER CONTROLLED AREA

The DQO process incorporates hypothesis testing and probabilistic sampling distributions to control decision errors during data analysis. Hypothesis testing is a process based on the scientific method that compares a baseline condition to an alternate condition. The baseline condition is technically known as the null hypothesis. Hypothesis testing rests on the premise that the null hypothesis is true and sufficient evidence must be provided to reject it in favor of the alternative hypothesis. In designing the survey plan, the underlying assumption, or null hypothesis was that residual activity in the survey unit exceeded the release criteria. Rejection of the null hypothesis would indicate that residual activity within the survey unit does not exceed the release criteria.
Therefore, the survey unit would satisfy the primary objective of the FSS sample plan.
The primary objective of the FSS sample plan is to demonstrate that the level of residual radioactivity in Survey Unit 8106 did not exceed the release criteria specified in the LTP and that the potential dose from residual radioactivity is as low as is reasonably achievable (ALARA).
TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan (Reference 6) establishes the basis for an initial suite of potential ROC for decommissioning. LTP Chapter 2 provides detailed characterization data that describes the results of surveys completed of soil. Surface samples were taken in each impacted open land survey unit and analyzed for the presence of plant-derived radionuclides. The results of surface soil characterization in the impacted area surrounding FCS indicate that there is minimal residual radioactivity in soil.
Insignificant contributors (ICs) were determined consistent with the guidance contained in Section 3.3 of NUREG-1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance
- Characterization, Survey, and Determination of Radiological Criteria (Reference 7). For soil, the ROCs were found to be Cs-137, Co-60, Eu-152, and C-14. The remaining radionuclides were designated as IC and were eliminated from further detailed evaluation.
Section 5.2.6 of the LTP states that each radionuclide specific BcDCGL is equivalent to the level of residual radioactivity (above background levels) that could, when considered independently, result in a total effective dose equivalent (TEDE) of 25 mrem/yr to an Average Member of the Critical Group. To ensure that the summation of dose from each source term is 25 mrem/yr or less after all FSS is completed, the BcDCGLs are reduced based on an expected, or a priori, fraction of the 25 mrem/yr dose limit from each source term. The reduced DCGLs (i.e., OpDCGLs) can be related to the BcDCGLs as an expected fraction of dose based on an a priori assessment of what the expected dose should be based on the results of site characterization, process knowledge, and the extent of planned remediation. The OpDCGL is then used as the DCGL for the FSS design of the survey unit (e.g., calculation of surrogate DCGLs or, investigation levels). Details of the OpDCGLs derived for each dose component and the basis for the applied a priori dose fractions are provided in Section 5.2.6 of the LTP.

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Multiple ROCs are known to be present at FCS. The dose contribution from each ROC is accounted for using the SOF to ensure that the total dose from all ROC does not exceed the dose criterion. A BcDCGL that is established for the average residual radioactivity in a survey unit is equivalent to a derived concentration guideline level wide area (DCGLW) as defined in MARSSIM.
At FCS, compliance is demonstrated through the summation of dose from seven distinct source terms (i.e., basements, soils, buried pipe, embedded pipe, above-ground structures, basement fill, and groundwater) for the end state. When applied to soil, the DCGLs are expressed in units of activity per unit of mass (pCi/g).
For FCS, soil is defined as a layer of soil beginning at the surface but extending to a depth of 1 m to allow for flexibility in compliance demonstration if contamination deeper than 0.15 m is encountered. Based on characterization data and historical information, there are no expectations of encountering a source term geometry that is comprised of a clean surface layer of soil over a contaminated subsurface soil layer. Section 6.9 of the LTP provides the exposure scenarios and modeling parameters that were used to calculate the site-specific soil DCGLs. The adjusted soil DCGLs for the unrestricted release of open land survey units as provided in the Section 6.16 of the LTP are presented in Table 4-1. The IC dose percentage of 5% was used to adjust the DCGLs in Table 4-1 to account for the dose from the eliminated IC radionuclides.

Table 4 Base Case DCGLs for Soil Surface Soil  Subsurface Radionuclide   BcDCGL      Soil BcDCGL (pCi/g)       (pCi/g)
C-14       5.70E+01      9.68E+00 Co-60       3.77E+00      2.93E+00 Cs-137      1.31E+01      7.27E+00 Eu-152      8.41E+00      7.36E+00

The reduced DCGLs, OpDCGLs, are calculated using Equation 5-1 from Chapter 5 of the LTP, shown as Equation 4-1 below.

Equation 4 OpDCGL Calculation

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The OpDCGLs for the unrestricted release of soil are provided in Table 4-2.

Table 4 Operational DCGLs for Soil Surface Soil    Subsurface Soil Radionuclide     OpDCGL (pCi/g)      OpDCGL (pCi/g)
C-14            1.59E+01         2.71E+00 Co-60             1.06E-00         8.21E-01 Cs-137           3.65E+00          2.04E-00 Eu-152           2.36E+00          2.06E-00

Instrument DQOs included a verification of the ability of the survey instrument to detect the radiations of interest relative to the OpDCGL. Survey instrument response checks were required prior to issuance and after the instrument had been used. Control and accountability of survey instruments were required to assure the quality and prevent the loss of data.
As part of the DQOs applied to laboratory processes, analysis results were reported as actual calculated results. The actual reported value was used as the recorded FSS result for measurement and sample values that are less than MDC. Negative values were recorded as zero. Results were not reported as less than MDC. Sample report summaries included unique sample identification, analytical method, radionuclide, result, uncertainty, laboratory data qualifiers, units, and the observed MDC.
In accordance with the LTP, for laboratory analysis, MDCs less than 10% of the OpDCGL were preferable while MDCs up to 50% of the OpDCGL were acceptable. The minimum acceptable MDC for measurements obtained using field instruments was 50% of the applicable OpDCGL.
: 5. SURVEY DESIGN

The level of effort associated with planning a survey is based on the complexity of the survey and nature of the hazards. Guidance for preparing FSS plans is provided in procedure FCSD-RA-LT-302, Final Status Survey Sample Plan Development (Reference 3).
The DQO process validated that Co-60, Cs-137, Eu-152, and C-14 would be the ROCs in Survey Unit 8106 as presented in LTP Section 5.2.5. As discussed in LTP Section 5.2.6.2, instead of inferring the concentrations for the hard to detect (HTD) ROC C-14 using a surrogate approach, 100% of all samples collected in the survey unit were sent for off-site analysis for C-14. Table 5-1 presents the action levels for Survey Unit 8106 sample results and are based on 50% of the Table 4-2 OpDCGLs.

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Table 5 Action Levels for Survey Unit 8106 ROC                      Action Level (pCi/g)
C-14                       7.95E+00 Co-60                      5.30E-01 Cs-137                      1.83E+00 Eu-152                      1.18E+00

The Sign Test was selected as the nonparametric statistical test to demonstrate compliance with the release criteria. The use of the Sign Test did not require the selection or use of a background reference area, which simplified survey design and implementation. This approach was conservative since it included background Cs-137 as part of the sample set.
The number of soil samples for FSS was determined in accordance with procedure FCSD-RA-LT-302 (Reference 3). The relative shift (/) for the survey unit data set is defined as shift (),
which is the upper boundary of the gray region (UBGR), or the DCGL (SOF of 1), minus the lower bound of the gray region (LBGR), divided by sigma (), which is the standard deviation of the data set used for survey design. The optimal value for / should range between 1 and 3. The largest value the / can have is 3. If the calculated value of / exceeds 3, an adjusted value of 3 will be used for /. The / for Survey Unit 8106, based on the data for surface soil samples collected during the characterization of Survey Unit 8106, was calculated as follows:

Equation 5 Relative Shift
                                    =  (1  0.0797)  = 16.76 0.0549

As the calculated / was greater than 3, a value of 3 was used as the adjusted /. Both the Type I error (i.e.,  value) and the Type II error (i.e.,  value) was set at 0.05.The sample size from Table 5.5 of MARSSIM that equates to the Type I and Type II error of 0.05 for use with the Sign Test is an N value of 14.
A prospective power curve was generated using MARSSIM Power 2000, a software package developed under the sponsorship of the United States Nuclear Regulatory Commission (NRC) for implementation of the MARSSIM in support of the decommissioning license termination rule (10 CFR 20, Subpart E). The result of the MARSSIM Power 2000 computer run showed adequate power for the survey design.

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Given that Survey Unit 8106 is Class 3, sample locations were selected randomly. The random locations of the soil samples were selected using Visual Sample Plan (VSP), in accordance with FCSD-RA-LT-302 (Reference 3). Input parameters included use of aerial photographs and the random sampling tool set with a predetermined number (14) of samples. The random coordinates generated with VSP were integrated with a GPS to identify the sample locations in the field.
Table 5-2 lists the random samples collected for FSS and the corresponding GPS coordinates, based on the Nebraska State Plane North American Datum 1983 coordinate system.

Table 5 Random Sample Locations Sample ID                   Northing                    Easting 8106X-3-FR-GSSX-001              194900.577                826642.342 8106X-3-FR-GSSX-002              194847.059                826729.485 8106X-3-FR-GSSX-003              195000.929                826592.690 8106X-3-FR-GSSX-004              194869.855                826695.286 8106X-3-FR-GSSX-005              195023.724                826558.491 8106X-3-FR-GSSX-006              194767.275                826832.081 8106X-3-FR-GSSX-007              194938.241                826720.935 8106X-3-FR-GSSA-008              194835.661                826857.730 8106X-3-FR-GSSX-009              194938.008                826521.875 8106X-3-FR-GSSX-010              194904.048                826823.531 8106X-3-FR-GSSX-011              194874.594                826780.524 8106X-3-FR-GSSX-012              194801.468                826755.134 8106X-3-FR-GSSX-013              194955.338                826618.339 8106X-3-FR-GSSX-014              195006.628                826669.637

In accordance with the sample plan, at least one judgmental sample is required from the survey unit. The number of judgmental samples collected was seven, which brings the total number of samples collected for the FSS of Survey Unit 8106 to 21. Table 5-3 lists the judgmental samples collected for FSS and the corresponding GPS coordinates.

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Table 5 Judgmental Sample Locations Sample ID                    Northing                    Easting 8106X-3-FJ-GSSX-015              194934.950                 826686.530 8106X-3-FJ-GSSX-016              194941.785                 826615.857 8106X-3-FJ-GSSX-017              194932.790                 826623.381 8106X-3-FJ-GSSX-018              194990.857                 826661.353 8106X-3-FJ-GSSX-019              194993.143                 826673.814 8106X-3-FJ-GSSA-020              194947.842                 826729.411 8106X-3-FJ-GSSX-021              194936.544                 826717.585

The implementation of quality control (QC) measures as referenced by Section 5.6.3 of the LTP and FCSD-RA-LT-100, Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station (QAPP; Reference 8) includes the collection of a soil sample for split sample analysis on 5% of the soil samples taken in a survey unit with the locations selected at random. Four soil samples, 8106X-3-FQ-GSSX-007, 8106X-3-FR-GSSB-008, 8106X-3-FJ-GSSB-020, 8106X-3-FQ-GSSX-021 were designated for split or duplicate sample QC analysis for the FSS of Survey Unit 8106.
Section 5.3.4 and Table 5-20 of the LTP specify that for Class 3 open land survey units, surface scans will be performed on a judgmental percentage of the surface area in the survey unit. For Survey Unit 8106, 10% scan coverage was selected, which  equals 9,979 m2.

For this Class 3 open land survey unit, the Investigation Levels for area scanning and soil sample measurement results are those levels specified in the Table 5-24 of the LTP and are reproduced below in Table 5-4.

Table 5 Investigation Levels Classification            Scan Investigation Levels          Direct Investigation Levels Class 3       >Operational DCGL or >MDCscan if MDCscan is   >0.5 Operational DCGL greater than Operational DCGL

Table 5-5 provides a synopsis of the survey design for Survey Unit 8106.

Table 5 Synopsis of Survey Design

Feature                       Design Criteria                      Basis Survey Unit Surface Area               99,788 m2                          GPS

Number of Random Samples (N)                  14                 *   / = 3 (adjusted)
* MARSSIM Table 5.5

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Feature                       Design Criteria                       Basis
* Co-60:  1.06 pCi/g DCGLs
* Cs-137: 3.65 pCi/g               Operational DCGLs for soil,
* Eu-152: 2.36 pCi/g                     LTP, Table 5-8
* C-14:    15.9 pCi/g Scan and Direct Investigation             Table 5-5                     LTP, Table 5-24 Levels Scan Areal Coverage              9,979 m2 (10% areal coverage)      LTP, Table 5-20

Judgmental Samples                        1                        Per Survey Design 7                      Actual Number Obtained HTD ROC Analysis                        100%                       LTP, Section 5.2.6.2 21                    Number of Samples Analyzed 1 duplicate and 1 split sample selected  LTP, Section 5.6.3 QC                             at random                  Actual Number Obtained 4
: 6. SURVEY IMPLEMENTATION

For Survey Unit 8106, compliance with the unrestricted release criteria was demonstrated through a combination of soil scanning with a Ludlum Model 44-20 gamma detector and the sampling of soil for isotopic analysis.
A License Termination/Final Status Survey (LT/FSS) Supervisor performed a visual inspection and walk-down of the survey unit on April 28, 2022, prior to performing FSS. The purpose of the walk-down was to assess the physical condition of the survey unit, evaluate access points and travel paths, and identify potentially hazardous conditions. At the time of survey, the soil in the survey unit was dry and free of any considerable constraint for the collection of samples and scan measurements.
FSS field activities were conducted under the FSS sample plan and included DQOs, survey design, detailed FSS instructions, job safety analysis, and related procedures for reference. FSS field activities were projected to take 10 working days to complete. Daily briefings were conducted to discuss the expectations for job performance and to review the safety aspects of the job. A Field Log was used to document field activities and other information pertaining to the performance of the FSS. FSS field activities commenced on July 11, 2022, and concluded on August 8, 2022.
A total of 15 different scan areas were scanned using a Ludlum Model 3001 paired with a Ludlum Model 44-20 (3 x 3) sodium iodide (NaI) detector and Trimble GPS unit. The background was established as the average of five one-minute static measurements, while maintaining the detector

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2 from the soil. In Survey Unit 8106, background ranged from 29,340 counts per minute (cpm) up to 36,220 cpm.
All designated scan areas were scanned using the Model 44-20 detector operated in the rate-meter mode and using audio response. The probe was positioned no more than 2 from the ground and was moved at a scan speed of approximately 0.25 m per second. In accordance with FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors (Reference 9), scan MDC was sufficient to detect residual radioactivity at the action level. Complete scan results are provided in Attachment 2.
The 14 random sample locations were marked with flags based on GPS coordinates provided.
Each soil sample consisted of approximately 1 liter of soil. The soil sample media was sifted to remove stones and other media larger than 1 centimeter in diameter. All soil samples were collected, controlled, transported, stored, and transferred to the on-site laboratory using the chain-of-custody process from FCSD-RA-LT-205, Chain-of-Custody Protocol for Site Characterization and Final Status Survey (Reference 10), and in accordance with FCSD-RA-LT-203, Sample Media Collection for Site Characterization and Final Status Survey (Reference 11) and FCSD-RA-LT-204, Sample Media Preparation for Site Characterization and Final Status Survey (Reference 12).
The survey design specified that 100% of the samples were required for the HTD ROC analysis.
In total, 21 samples were selected for HTD radionuclide analysis.
The implementation of survey specific QC measures included the collection of four samples (8106X-3-FQ-GSSX-007, 8106X-3-FR-GSSB-008, 8106X-3-FJ-GSSB-020, and 8106X-3-FQ-GSSX-021) for split or duplicate sample analysis.
: 7. SURVEY RESULTS

All areas identified in the FSS sample plan were scanned for elevated activity levels. By scanning Survey Unit 8106 within accessible land, the 9,979 m2 scan requirement was achieved. Figure 33 in Attachment 1 presents the scan areas within the unit. Table 7-1 provides an overview of the scan results for the gamma walkovers. Complete scan results are provided in Attachment 2, Table 16-1.

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Table 7 Synopsis of Scan Results Scan       Min Scan        Max Scan        Action        Scan       Judgmental Area         Logged          Logged       Level (cpm)    Alarms?      Samples Reading (cpm)   Reading (cpm)                   (Y/N) 1           19000           35638         33930           Y             0

2           19016           36228         34545           Y             0

3           19519           33191         31348           Y             0

4           20450           36692         33377           Y             0

5           20283           35551         33356           Y             0

6           20254           40574         33992           Y             0

7           19016           34154         32701           Y             0

8           19050           40049         37881           Y             0

9           19050           32508         31491           Y             0

10          19047           35989         33828           Y             0

11          19030           36098         33910           Y             0

12          19351           36760         34299           Y             0

13          25090           32183         30835           Y             2

14          19042           33588         32311           Y             2

15          20254           32923         31491           Y             1

7Q           28177           34633         32762           Y             2

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For Survey Unit 8106 Grid 1, count rates ranged between 19,000 cpm and 35,638 cpm, with a mean count rate of 31,642 cpm and a standard deviation of 2,670 cpm. Figure 7-1 below presents a map of the gamma walkover for  Survey Unit 8106 Grid 1.

Figure 7 Survey Unit 8106 Grid 1 GPS Scan Results

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An evaluation of the Survey Unit 8106 Grid 1 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-2 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid 1.

Figure 7 Survey Unit 8106 Grid 1 Z-Score Map

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For Survey Unit 8106 Grid 2, count rates ranged between 19,016 cpm and 36,228 cpm, with a mean count rate of 32,739 cpm and a standard deviation of 2,563 cpm. Figure 7-3 below presents a map of the gamma walkover for Survey Unit 8106 Grid 2.

Figure 7 Survey Unit 8106 Grid 2 GPS Scan Results

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An evaluation of the Survey Unit 8106 Grid 2 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure7-4 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid 2.

Figure7 Survey Unit 8106 Grid 2 Z-Score Map

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For Survey Unit 8106 Grid 3, count rates ranged between 19,519 cpm and 33,191 cpm, with a mean count rate of 28,907 cpm and a standard deviation of 2,260 cpm. Figure 7-5 below presents a map of the gamma walkover for Survey Unit 8106 Grid 3.

Figure 7 Survey Unit 8106 Grid 3 GPS Scan Results

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An evaluation of the Survey Unit 8106 Grid 3 data set was performed to evaluate the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-6 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid 3.

Figure 7 Survey Unit 8106 Grid 3 Z-Score Map

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For Survey Unit 8106 Grid 4, count rates ranged between 20,450 cpm and 36,692 cpm, with a mean count rate of 32,077 cpm and a standard deviation of 1,725 cpm. Figure 7-7 below presents a map of the gamma walkover for Survey Unit 8106 Grid 4.

Figure 7 Survey Unit 8106 Grid 4 GPS Scan Results

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An evaluation of the Survey Unit 8106 Grid 4 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-8 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid 4.

Figure 7 Survey Unit 8106 Grid 4 Z-Score Map

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For Survey Unit 8106 Grid 5, count rates ranged between 20,283 cpm and 35,551 cpm, with a mean count rate of 31,913 cpm and a standard deviation of 2,186 cpm. Figure 7-9 below presents a map of the gamma walkover for Survey Unit 8106 Grid 5.

Figure 7 Survey Unit 8106 Grid 5 GPS Scan Results

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An evaluation was performed with the Survey Unit 8106 Grid 5 data set to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-10 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid 5.

Figure 7 Survey Unit 8106 Grid 5 Z-Score Map

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For Survey Unit 8106 Grid 6, count rates ranged between 20,254 cpm and 40,574 cpm, with a mean count rate of 34,665 cpm and a standard deviation of 3,878 cpm. Figure 7-11 below presents a map of the gamma walkover for Survey Unit 8106 Grid 6.

Figure 7 Survey Unit 8106 Grid 6 GPS Scan Results

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An evaluation of the Survey Unit 8106 Grid 6 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-12 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid 6.

Figure 7 Survey Unit 8106 Grid 6 Z-Score Map

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For Survey Unit 8106 Grid 7, count rates ranged between 19,016 cpm and 34,154 cpm, with a mean count rate of 30,337 cpm and a standard deviation of 2,618 cpm. Figure 7-13 below presents a map of the gamma walkover for Survey Unit 8106 Grid 7.

Figure 7 Survey Unit 8106 Grid 7 GPS Scan Results

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An evaluation of the Survey Unit 8106 Grid 7 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-14 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid 7.

Figure 7 Survey Unit 8106 Grid 7 Z-Score Map

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For the Survey Unit 8106 Grid 7 (QC), count rates ranged between 28,177 cpm and 34,633 cpm, with a mean count rate of 31,447 cpm and a standard deviation of 909 cpm. Figure 7-15 below presents a map of the gamma walkover for Survey Unit 8106 Grid 7 (QC).

Figure 7 Survey Unit 8106 Grid 7 QC GPS Scan Results

An evaluation of the Survey Unit 8106 Grid 7 QC data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e., +3 Z-Score). Two locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-16 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid 7 QC and the selected biased sampling locations.

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Figure 7 Survey Unit 8106 Grid 7 QC Z-Score and Sample Map (Locations 20-21)

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For the Survey Unit 8106 Grid 8, count rates ranged between 19,050 cpm and 40,049 cpm, with a mean count rate of 31,867 cpm and a standard deviation of 4,487 cpm. Figure 7-17 below presents a map of the gamma walkover for Survey Unit 8106 Grid 8.

Figure 7 Survey Unit 8106 Grid 8 GPS Scan Results

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An evaluation was performed with the Survey Unit 8106 Grid 8 data set to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement. Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 18 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid 8.

Figure 18 - Survey Unit 8106 Grid 8 Z-Score Map

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For Survey Unit 8106 Grid 9, count rates ranged between 19,050 cpm and 32,508 cpm, with a mean count rate of 29,157 cpm and a standard deviation of 1,903 cpm. Figure 19 below presents a map of the gamma walkover for Survey Unit 8106 Grid 9.

Figure 19 - Survey Unit 8106 Grid 9 GPS Scan Results

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An evaluation of the Survey Unit 8106 Grid 9 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 20 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid 9.

Figure 20 - Survey Unit 8106 Grid 9 Z-Score Map

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For Survey Unit 8106 Grid 10, count rates ranged between 19,047 cpm and 35,989 cpm, with a mean count rate of 31,685 cpm and a standard deviation of 1,985 cpm. Figure 21 below presents a map of the gamma walkover for Survey Unit 8106 Grid 10.

Figure 21 - Survey Unit 8106 Grid 10 GPS Scan Results

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An evaluation of the Survey Unit 8106 Grid 10 data set was performed to evaluate the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 22 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid 10.

Figure 22 - Survey Unit 8106 Grid 10 Z-Score Map

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For Survey Unit 8106 Grid 11, count rates ranged between 19,030 cpm and 36,098 cpm, with a mean count rate of 31,951 cpm and a standard deviation of 1,421 cpm. Figure 23 below presents a map of the gamma walkover for Survey Unit 8106 Grid 11.

Figure 23 - Survey Unit 8106 Grid 11 GPS Scan Results

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An evaluation of the Survey Unit 8106 Grid 11 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 24 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid 11.

Figure 24 - Survey Unit 8106 Grid 11 Z-Score Map

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For Survey Unit 8106 Grid 12, count rates ranged between 19,351 cpm and 36,760 cpm, with a mean count rate of 32,265 cpm and a standard deviation of 3,234 cpm. Figure 25 below presents a map of the gamma walkover for Survey Unit 8106 Grid 12.

Figure 25 - Survey Unit 8106 Grid 12 GPS Scan Results

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An evaluation of the Survey Unit 8106 Grid 12 data set was performed to evaluate the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Zero locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 26 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid 12.

Figure 26 - Survey Unit 8106 Grid 12 Z-Score Map

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For Survey Unit 8106 Grid 13, count rates ranged between 25,090 cpm and 32,183 cpm, with a mean count rate of 28,954 cpm and a standard deviation of 874 cpm. Figure 27 below presents a map of the gamma walkover for Survey Unit 8106 Grid 13.

Figure 27 - Survey Unit 8106 Grid 13 GPS Scan Results

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An evaluation of the Survey Unit 8106 Grid 13 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Two locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 28 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid 13 and the selected biased sampling locations.

Figure 28 - Survey Unit 8106 Grid 13 Z-Score and Sample Map (Locations 16-17)

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For Survey Unit 8106 Grid 14, count rates ranged between 19,042 cpm and 33,588 cpm, with a mean count rate of 30,427 cpm and a standard deviation of 985 cpm. Figure 29 below presents a map of the gamma walkover for Survey Unit 8106 Grid 14.

Figure 29 - Survey Unit 8106 Grid 14 GPS Scan Results

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An evaluation of the Survey Unit 8106 Grid 14 data set was performed to evaluate the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Two locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 30 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid 14 and the selected biased sampling locations.

Figure 30 - Survey Unit 8106 Grid 14 Z-Score and Sample Map (Locations 18-19)

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For Survey Unit 8106 Grid J15, count rates ranged between 20,254 cpm and 32,923 cpm, with a mean count rate of 29,704 cpm and a standard deviation of 1,913 cpm. Figure 31 below presents a map of the gamma walkover for Survey Unit 8106 Grid J15.

Figure 31 - Survey Unit 8106 Grid J15 GPS Scan Results

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An evaluation of the Survey Unit 8106 Grid J15 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). One location was selected for biased sample collection based on evaluation of the gamma walkover data. This biased location represents the maximum measurements encountered within the scan area. Figure 32 below presents a map of the +3 Z-Score measurements within Survey Unit 8106 Grid J15 and the selected biased sampling location.

Figure 32 - Survey Unit 8106 Grid J15 Z-Score and Sample Map (Location 15)

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The on-site laboratory analyzed the 14 soil samples taken for nonparametric statistical testing using the on-site gamma spectroscopy system. A summary of the results for the 14 samples collected for nonparametric statistical testing is provided in Table 7-2. Gamma spectroscopy results revealed that ROCs were positively identified. The off-site laboratory, GEL Laboratories, analyzed the 14 random samples for the HTD ROC C-14. C-14 was not detected in any of the 14 random samples. Cs-137 was detected in 2 of the 14 random samples. The maximum operational sum of fractions (OpSOF) for random samples is 0.2199.
The basic statistics for the random sample population, as compared to the BcDCGLs, and the survey unit dose are summarized in Table 7-3.
The SOF or unity rule is the mathematical test used to evaluate compliance with radiological criteria for license termination when more than one radionuclide has been determined to be potentially present. The equation for the unity rule is:

Equation 7 Unity Rule

Where:     Cn            =       concentration of radionuclide n DCGLn         =       DCGL of radionuclide n.

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Random Samples

Measured     OpDCGL          Fraction of Sample ID         ROC      Activity     (pCi/g)         OpDCGL         OpSOF (pCi/g)

Co-60   0.00E+00     1.06E+00         0.00E+00 8106X-3-FR-GSSX-001   Cs-137   1.54E-01     3.65E+00         4.22E-02       0.04300 Eu-152   0.00E+00     2.36E+00         0.00E+00 C-14    1.29E-02     1.59E+01         8.11E-04 Co-60   0.00E+00     1.06E+00         0.00E+00 8106X-3-FR-GSSX-002   Cs-137   8.16E-02     3.65E+00         2.24E-02       0.04929 Eu-152   2.72E-02     2.36E+00         1.15E-02 C-14    2.45E-01     1.59E+01         1.54E-02 Co-60   1.27E-01     1.06E+00         1.20E-01 8106X-3-FR-GSSX-003   Cs-137   0.00E+00     3.65E+00         0.00E+00       0.13252 Eu-152   0.00E+00     2.36E+00         0.00E+00 C-14    2.02E-01     1.59E+01         1.27E-02

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Measured      OpDCGL           Fraction of Sample ID          ROC      Activity       (pCi/g)         OpDCGL          OpSOF (pCi/g)

Co-60    2.21E-02      1.06E+00         2.08E-02 8106X-3-FR-GSSX-004    Cs-137    3.12E-01      3.65E+00         8.55E-02        0.10633 Eu-152    0.00E+00      2.36E+00         0.00E+00 C-14     0.00E+00      1.59E+01         0.00E+00 Co-60    0.00E+00      1.06E+00         0.00E+00 8106X-3-FR-GSSX-005    Cs-137    1.34E-01      3.65E+00         3.67E-02        0.04759 Eu-152    0.00E+00      2.36E+00         0.00E+00 C-14     1.73E-01      1.59E+01         1.09E-02 Co-60    2.60E-02      1.06E+00         2.45E-02 8106X-3-FR-GSSX-006    Cs-137    0.00E+00      3.65E+00         0.00E+00        0.04189 Eu-152    0.00E+00      2.36E+00         0.00E+00 C-14     2.76E-01      1.59E+01         1.74E-02 Co-60    2.13E-02      1.06E+00         2.01E-02 8106X-3-FR-GSSX-007    Cs-137    9.13E-02      3.65E+00         2.50E-02        0.06423 Eu-152    0.00E+00      2.36E+00         0.00E+00 C-14     3.04E-01      1.59E+01         1.91E-02 Co-60    2.37E-02      1.06E+00         2.24E-02 8106X-3-FR-GSSA-008    Cs-137    1.23E-02      3.65E+00         3.37E-03        0.06892 Eu-152    3.01E-02      2.36E+00         1.28E-02 C-14     4.84E-01      1.59E+01         3.04E-02 Co-60    0.00E+00      1.06E+00         0.00E+00 Cs-137    1.98E-01      3.65E+00         5.42E-02 8106X-3-FR-GSSX-009    Eu-152    3.17E-01      2.36E+00         1.34E-01        0.19970

C-14     1.77E-01      1.59E+01         1.11E-02 Co-60    4.01E-03      1.06E+00         3.78E-03 8106X-3-FR-GSSX-010    Cs-137    7.66E-02      3.65E+00         2.10E-02        0.21991 Eu-152    3.93E-01      2.36E+00         1.67E-01 C-14     4.55E-01      1.59E+01         2.86E-02 Co-60    0.00E+00      1.06E+00         0.00E+00

Cs-137    1.55E-01      3.65E+00         4.25E-02 8106X-3-FR-GSSX-011                                                             0.06259 Eu-152    0.00E+00      2.36E+00         0.00E+00 C-14     3.20E-01      1.59E+01         2.01E-02

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Measured      OpDCGL          Fraction of Sample ID         ROC      Activity      (pCi/g)         OpDCGL         OpSOF (pCi/g)

Co-60    4.07E-02     1.06E+00         3.84E-02 8106X-3-FR-GSSX-012   Cs-137    2.39E-02     3.65E+00         6.55E-03       0.05865 Eu-152   0.00E+00      2.36E+00         0.00E+00 C-14     2.18E-01     1.59E+01         1.37E-02 Co-60    1.13E-01     1.06E+00         1.07E-01 8106X-3-FR-GSSX-013   Cs-137    2.73E-01     3.65E+00         7.48E-02       0.19910 Eu-152    2.95E-02     2.36E+00         1.25E-02 C-14     8.27E-02     1.59E+01         5.20E-03 Co-60    4.93E-02     1.06E+00         4.65E-02 8106X-3-FR-GSSX-014   Cs-137    9.58E-02     3.65E+00         2.62E-02       0.08936 Eu-152   0.00E+00      2.36E+00         0.00E+00 C-14     2.64E-01     1.59E+01         1.66E-02 Note: Bold values indicate concentrations greater than MDC.

Table 7 Basic Statistical Properties of Random Sample Population and Survey Unit Dose Mean      Median      Max        Min     Std. Dev. BcDCGL       Avg ROC                                                                     BcSOF      Avg (pCi/g)    (pCi/g)   (pCi/g)   (pCi/g)    (pCi/g)   (pCi/g)      per    Dose per ROC       ROC Co-60   3.05E-02   2.17E-02   1.27E-01 0.00E+00   4.13E-02  3.77E+00   8.09E-03  2.02E-01

Cs-137  1.15E-01   9.36E-02   3.12E-01 0.00E+00   9.73E-02  1.31E+01   8.76E-03  2.19E-01

Eu-152   5.69E-02   0.00E+00   3.93E-01 0.00E+00   1.28E-01  8.41E+00   6.77E-03  1.69E-01

C-14    2.30E-01   2.32E-01   4.84E-01 0.00E+00   1.42E-01  5.70E+01   4.03E-03  1.01E-01 Mean base case sum of fractions (BcSOF) = 0.0277 DOSE ASSIGNED TO SURVEY UNIT = 0.6913 mrem/yr

The on-site laboratory analyzed the seven judgmental soil samples using the on-site gamma spectroscopy system. A summary of the analytical results for the judgmental soil samples is provided in Table 7-4. Gamma spectroscopy results revealed that Cs-137 was positively identified in 1 judgmental sample. No other ROCs were positively identified. GEL Laboratories analyzed the seven judgmental samples for the HTD ROC C-14. C-14 was not detected in any of the seven judgmental samples. The maximum OpSOF for judgmental samples is 0.1446.

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Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples Measured      OpDCGL           Fraction of Sample ID         ROC      Activity      (pCi/g)         OpDCGL          OpSOF (pCi/g)
Co-60    1.09E-01      1.06E+00          1.03E-01 8106X-3-FJ-GSSX-015   Cs-137   5.59E-02      3.65E+00          1.53E-02       0.14462 Eu-152   0.00E+00      2.36E+00          0.00E+00 C-14    4.21E-01      1.59E+01          2.65E-02 Co-60    4.52E-02      1.06E+00          4.26E-02 8106X-3-FJ-GSSX-016   Cs-137   9.37E-02      3.65E+00          2.57E-02       0.09139 Eu-152   0.00E+00      2.36E+00          0.00E+00 C-14    3.67E-01      1.59E+01          2.31E-02 Co-60    3.40E-03      1.06E+00          3.21E-03 8106X-3-FJ-GSSX-017   Cs-137   1.53E-01      3.65E+00          4.19E-02       0.06638 Eu-152   0.00E+00      2.36E+00          0.00E+00 C-14    3.38E-01      1.59E+01          2.13E-02 Co-60    8.06E-02      1.06E+00          7.60E-02 8106X-3-FJ-GSSX-018   Cs-137   1.27E-01      3.65E+00          3.48E-02       0.12901 Eu-152   0.00E+00      2.36E+00          0.00E+00 C-14    2.89E-01      1.59E+01          1.82E-02 Co-60    6.34E-02      1.06E+00          5.98E-02 8106X-3-FJ-GSSX-019   Cs-137   9.03E-02      3.65E+00          2.47E-02       0.11354 Eu-152   0.00E+00      2.36E+00          0.00E+00 C-14    4.61E-01      1.59E+01          2.90E-02 Co-60    3.41E-02      1.06E+00          3.22E-02 8106X-3-FJ-GSSA-020   Cs-137   1.34E-01      3.65E+00          3.67E-02       0.07213 Eu-152   0.00E+00      2.36E+00          0.00E+00 C-14    5.17E-02      1.59E+01          3.25E-03 Co-60    5.92E-02      1.06E+00          5.58E-02 8106X-3-FJ-GSSX-021   Cs-137   3.54E-02      3.65E+00          9.70E-03       0.07133 Eu-152   0.00E+00      2.36E+00          0.00E+00 C-14    9.19E-02      1.59E+01          5.78E-03 Note: Bold values indicate concentrations greater than MDC.

The implementation of survey specific QC measurements included the collection of four samples (8106X-3-FQ-GSSX-007, 8106X-3-FR-GSSB-008, 8106X-3-FJ-GSSB-020, and 8106X-3-FQ-GSSX-021) for split or duplicate sample analysis. The on-site laboratory analyzed the QC samples using the on-site gamma spectroscopy system. A summary of the analytical results for

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the QC samples is provided in Table 7-5. Gamma spectroscopy results revealed that Cs-137 was not positively identified in any of the QC samples. No other ROCs were positively identified in any QC sample. The maximum OpSOF for QC samples is 0.1258.

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples

Measured   OpDCGL          Fraction of Sample ID       ROC      Activity     (pCi/g)       OpDCGL         OpSOF (pCi/g)

Co-60    5.58E-02    1.06E+00        0.05264 8106X-3-FQ-      Cs-137   3.22E-02    3.65E+00        0.00882       0.06146 GSSX-007       Eu-152   0.00E+00    2.36E+00        0.00000 C-14    0.00E+00    1.59E+01        0.00000 Co-60    1.16E-02    1.06E+00        0.01094 8106X-3-FR-     Cs-137   4.18E-02    3.65E+00        0.01145       0.02240 GSSB-008       Eu-152   0.00E+00    2.36E+00        0.00000 C-14    0.00E+00    1.59E+01        0.00000 Co-60    1.79E-02    1.06E+00        0.01689 8106X-3-FJ-     Cs-137   0.00E+00    3.65E+00        0.00000       0.12579 GSSB-020       Eu-152   2.57E-01    2.36E+00        0.10890 C-14    0.00E+00    1.59E+01        0.00000 Co-60    1.04E-01    1.06E+00        0.09811 8106X-3-FQ-      Cs-137   5.57E-02    3.65E+00        0.01526       0.11337 GSSX-021       Eu-152   0.00E+00    2.36E+00        0.00000 C-14    0.00E+00    1.59E+01        0.00000 Note: Bold values indicate concentrations greater than MDC.
: 8. QUALITY CONTROL

The on-site laboratory processed four split and duplicate samples (8106X-3-FQ-GSSX-007, 8106X-3-FR-GSSB-008, 8106X-3-FJ-GSSB-020, and 8106X-3-FQ-GSSX-021) using gamma spectroscopy analysis. The data was evaluated using the acceptance criteria specified in NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual (Reference 13) as detailed in Section 5.6.3.2 of the LTP. There were no ROCs detected in the standard or comparison samples, therefore there was acceptable agreement between standard and comparison sample results in all cases. Refer to Attachment 4 for data and QC analysis results.

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: 9. INVESTIGATIONS AND RESULTS

During the FSS of Survey Unit 8106 areas with a +3 sigma/alarms were investigated. Seven judgmental samples were collected for investigation, all with radiological concentrations below the OpDCGL.
: 10. REMEDIATION AND RESULTS

No radiological remedial action as described by MARSSIM Section 5.4 was performed in Survey Unit 8106 prior to or as a result of the FSS. Chapter 4 of the LTP determined that remediation beyond that required to meet the release criteria is unnecessary and the remaining radioactivity in soil was ALARA.
: 11. CHANGES FROM THE FINAL STATUS SURVEY PLAN

There were no addendums to the FSS plan.
: 12. DATA QUALITY ASSESSMENT

The DQO sample design and data were reviewed in accordance with FCSD-RA-LT-304, Final Status Survey Data Assessment (Reference 14) for completeness and consistency.
Documentation was complete and legible. Surveys and the collection of samples were consistent with the DQOs and were sufficient to ensure that the survey unit was properly designated as Class
: 3. The survey design had adequate power as indicated by the retrospective power curve (see , Figure 37).
The measurement results indicated that all samples were less than a SOF of 1 when compared to the OpDCGLs.
Although MARSSIM states that the Sign Test need not be performed in the instance that no measurements surpass the OpDCGL, the test was conducted to demonstrate adherence to the statistical principles of the DQO process. The Sign Test was performed on the data and compared to the original assumptions of the DQOs. The evaluation of the Sign Test results clearly demonstrates that Survey Unit 8106 passes the unrestricted release criteria, thus, the null hypothesis is rejected. The results of the Sign Test are presented in Attachment 3.
The preliminary data review consisted of calculating basic statistical quantities (e.g., mean, median, standard deviation). All data was considered valid including negative values, zeros, and values reported below the MDC. The mean and median values for each ROC were well below the respective OpDCGLs. Also, the retrospective power curve shows that enough samples were collected to achieve the desired power; therefore, Survey Unit 8106 meets the unrestricted release criteria with adequate power as required by the DQOs.

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The mean of all identified isotopes is less than the Consultation Triggers for Residential Soil Concentration depicted in Table H.1 of NUREG 1757, Vol.1, Rev. 2 (Memorandum of Understanding Table 1). The full table is included in Attachment 5 of this release record.
The data for Cs-137 is presented graphically through a frequency plot and quantile plot. All graphical presentations are provided in Attachment 6.
: 13. ANOMALIES

No anomalies were observed during the performance or analyses of the survey.
: 14. CONCLUSION

Survey Unit 8106 has met the DQOs of the FSS plan. The ALARA criteria as specified in Chapter 4 of the LTP were achieved. The elevated measurement comparison for soils was not applicable and remediation was not required.
All identified ROCs were used for statistical testing to determine the adequacy of Survey Unit 8106 for FSS. Evaluation of the data shows that none of the random ROC concentration values exceeds the OpDCGLs; therefore, in accordance with LTP Section 5.2.6, the survey unit meets the release criteria.
The sample data passed the Sign Test. The null hypothesis was rejected. The retrospective power curve showed that adequate power was achieved. Survey Unit 8106 is properly classified as Class 3.
The dose contribution from soil in Survey Unit 8106 is 0.6913 mrem/yr TEDE, based on the average concentration of the ROCs in samples used for nonparametric statistical testing.
Survey Unit 8106 is acceptable for unrestricted release.

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: 15. REFERENCES
: 1. FCSD-RA-LT-305, Final Status Survey Data Reporting
: 2. Fort Calhoun Station Decommissioning Project License Termination Plan
: 3. FCSD-RA-LT-302, Final Status Survey Sample Plan Development
: 4. NUREG-1575, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual
: 5. TSD 20-001, Historical Site Assessment for Fort Calhoun Station
: 6. TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan
: 7. NUREG-1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance -
Characterization, Survey, and Determination of Radiological Criteria - Draft Report for Comment
: 8. FCSD-RA-LT-100, Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station
: 9. FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors
: 10. FCSD-RA-LT-205, Chain-of-Custody Protocol for Site Characterization and Final Status Survey
: 11. FCSD-RA-LT-203, Sample Media Collection for Site Characterization and Final Status Survey
: 12. FCSD-RA-LT-204, Sample Media Preparation for Site Characterization and Final Status Survey
: 13. NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual
: 14. FCSD-RA-LT-304, Final Status Survey Data Assessment

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: 16. ATTACHMENTS

Attachment 1 - Random and Judgmental Sample Collection Locations Attachment 2 - Complete Scan Data Attachment 3 - Soil Samples Sign Test Attachment 4 - Quality Control Assessment Attachment 5 - Consultation Triggers for Residential Soil Concentrations Attachment 6 - Graphical Presentations

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ATTACHMENT 1 - RANDOM AND JUDGMENTAL SAMPLE COLLECTION LOCATIONS MAPS:

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Figure 33 - Survey Unit 8106 Random Sample Locations and Scan Areas

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Figure 34 - Survey Unit 8106 Judgmental Sample Locations

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ATTACHMENT 2 - COMPLETE SCAN DATA

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Table 16 Survey Unit 8106 Complete Scan Data Min      Max Detector  Detector    M3001     Survey               Scan     Scan        Avg       Action    Scan Type        ID          ID       Unit   Location   Logged   Logged   Background    Level    Alarms?
Result   Result      (cpm)      (cpm)     (Y/N)
(cpm)    (cpm) 44-20    PR404738   25021210     8106       1      19000    35638       32360      33930       Y 44-20    PR404738   25021210     8106       2      19016    36228       32960      34545       Y 44-20    PR404738   25021210     8106       3      19519    33191       29840      31348       Y 44-20    PR403795   25021219     8106       4      20450    36692       31820      33377       Y 44-20    PR403795   25021219     8106       5      20283    35551       31800      33356       Y 44-20    PR404738   25021210     8106       6      20254    40574       32420      33992       Y 44-20    PR404738   25021210     8106       7      19016    34154       31160      32701       Y 44-20    PR403795   25021219     8106       8      19050    40049       36220      37881       Y 44-20    PR404738   25021210     8106       9      19050    32508       29980      31491       Y 44-20    PR404738   25021210     8106      10      19047    35989       32260      33828       Y 44-20    PR403795   25021219     8106      11      19030    36098       32340      33910       Y 44-20    PR404738   25021210     8106      12      19351    36760       32720      34299       Y 44-20    PR403795   25021219     8106      13      25090    32183       29340      30835       Y 44-20    PR403795   25021219     8106      14      19042    33588       30780      32311       Y 44-20    PR404738   25021210     8106      15      20254    32923       29980      31491       Y 44-20    PR397732   25021209     8106      16               34200 44-20    PR397732                8106      17               33700 44-20    PR397732                8106      18               33300 44-20    PR397732                8106      19               33300 44-20    PR397732                8106      20               32800 44-20    PR397732                8106      21               33600 44-20    PR403795   25021219     8106      7Q      28177    34633       31220      32762       Y Areas above three standard deviations were scanned for verification of original scans prior to judgmental sample collection.

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ATTACHMENT 3 - SOIL SAMPLES SIGN TEST

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Table 16 Survey Unit 8106 Soil Samples Sign Test
                            #         SOF        1-Ws        Sign (Ws) 1       0.04300       0.96        +1 2       0.04929       0.95        +1 3       0.13252       0.87        +1 4       0.10633       0.89        +1 5       0.04759       0.95        +1 6       0.04189       0.96        +1 7       0.06423       0.94        +1 8       0.06892       0.93        +1 9       0.19970       0.80        +1 10       0.21991       0.78        +1 11       0.06259       0.94        +1 12       0.05865       0.94        +1 13       0.19910       0.80        +1 14       0.08936       0.91        +1 Number of positive   differences (S+)                    14

Critical Value     10

Survey Unit           Meets the Acceptance Criteria

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ATTACHMENT 4 - QUALITY CONTROL ASSESSMENT

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Table 16 Duplicate Assessment Form

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ATTACHMENT 5 - CONSULTATION TRIGGERS FOR RESIDENTIAL SOIL CONCENTRATION

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ATTACHMENT 6 - GRAPHICAL PRESENTATIONS

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Figure 35 - Quantile Plot for Cs-137 Concentration

Quantile Plot For Cs        -137

3.50E-01

3.00E-01

2.50E-01

2.00E-01

1.50E-01

1.00E-01

5.00E-02

0.00E+00 0%    10%   20%    30%   40%    50%   60%    70%   80%   90%   100%

PERCENTAGE

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Figure 36 - Histogram for Cs-137 Concentration

Frequency Plot For Cs         -137

10 9
8 7
6 5
4 3
2 1
0 5.20E-02    1.04E-01    1.56E-01    2.08E-01    2.60E-01    3.22E-01

UPPER END VALUE (PCI/G)

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Figure 37 - Retrospective Power Curvey for Survey Unit 8106

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FORT CALHOUN STATION FINAL STATUS SURVEY RELEASE RECORD

SURVEY UNIT 8109 NORTH OWNER CONTROLLED AREA

REVISION 0

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PREPARED BY / DATE:
M. Bryant, LT/FSS Specialist

REVIEWED BY / DATE:
M. Uz, LT/FSS Specialist

REVIEWED BY /    DATE:
A. Barker Regulatory Assurance & Emergency Planning Manager

REVIEWED BY / DATE:
D. Whisler Manager Radiation Protection & Chemistry

APPROVED BY / DATE:
B. Bishop, LT/FSS Manager

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8109 NORTH OWNER CONTROLLED AREA

TABLE OF CONTENTS
: 1. EXECUTIVE 

==SUMMARY==
 .................................................................................................................. 8
: 2. SURVEY UNIT DESCRIPTION ........................................................................................................ 8
: 3. CLASSIFICATION BASIS .................................................................................................................. 9
: 4. DATA QUALITY OBJECTIVES ..................................................................................................... 11
: 5. SURVEY DESIGN .............................................................................................................................. 15
: 6. SURVEY IMPLEMENTATION ....................................................................................................... 19
: 7. SURVEY RESULTS ........................................................................................................................... 21
: 8. QUALITY CONTROL ....................................................................................................................... 62
: 9. INVESTIGATIONS AND RESULTS ............................................................................................... 63
: 10. REMEDIATION AND RESULTS .................................................................................................... 63
: 11. CHANGES FROM THE FINAL STATUS SURVEY PLAN                                       ......................................................... 63
: 12. DATA QUALITY ASSESSMENT .................................................................................................... 63
: 13. ANOMALIES ...................................................................................................................................... 64
: 14. CONCLUSION ................................................................................................................................... 64
: 15. REFERENCES .................................................................................................................................... 65
: 16. ATTACHMENTS ............................................................................................................................... 66

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LIST OF TABLES

Table 3 Cs-137 and Co-60 Characterization Survey Statistical Quantities ....................................... 9 Table 3 Off-Site Analysis for Characterization Samples from Survey Unit 8100                      .......................... 10 Table 4 Base Case DCGLs for Soil ...................................................................................................... 13 Table 4 OpDCGLs for Soil................................................................................................................... 14 Table 5 Action Levels for Survey Unit 8109 ....................................................................................... 15 Table 5 Random Sample Locations ..................................................................................................... 16 Table 5 Judgmental Sample or Measurement Locations .................................................................. 17 Table 5 Investigation Levels ................................................................................................................ 18 Table 5 Synopsis of Survey Design ...................................................................................................... 19 Table 7 Synopsis of Scan Results ......................................................................................................... 21 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Samples Comprising the Statistical Sample Population ................................................................................. 54 Table 7 Basic Statistical Properties of Random Sample Population and Survey Unit Dose                         .......... 56 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples/Measurements ...................................................................................................................... 57 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples                                 .. 62 Table 16 Survey Unit 8109 Complete Scan Data ............................................................................... 71 Table 16 Survey Unit 8109 Sign Test .................................................................................................. 73 Table 16 Survey Unit 8109 QC Assessment ....................................................................................... 75

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LIST OF FIGURES

Figure 7 Survey Unit 8109 Grid 1 GPS Scan Results ........................................................................ 22 Figure 7 Survey Unit 8109 Grid 1 Z-Score and ISOCS Measurement Map ................................... 23 Figure 7 Survey Unit 8109 Grid 2 GPS Scan Results ........................................................................ 24 Figure 7 Survey Unit 8109 Grid 2 Z-Score and ISOCS Measurement Map ................................... 25 Figure 7 Survey Unit 8109 Grid 3 GPS Scan Results ........................................................................ 26 Figure 7 Survey Unit 8109 Grid 3 Z-Score Map ................................................................................ 27 Figure 7 Survey Unit 8109 Grid 4 GPS Scan Results ........................................................................ 28 Figure 7 Survey Unit 8109 Grid 4 Z-Score and ISOCS Measurement Map ................................... 29 Figure 7 Survey Unit 8109 Grid 5 GPS Scan Results ........................................................................ 30 Figure 7 Survey Unit 8109 Grid 5 Z-Score Map .............................................................................. 31 Figure 7 Survey Unit 8109 Grid 5QC GPS Scan Results                 ................................................................ 32 Figure 7 Survey Unit 8109 Grid 5QC Z-Score and ISOCS Measurement Map ........................... 33 Figure 7 Survey Unit 8109 Grid 6 GPS Scan Results ...................................................................... 34 Figure 7 Survey Unit 8109 Grid 6 Z-Score Map .............................................................................. 35 Figure 7 Survey Unit 8109 Grid 7 GPS Scan Results ...................................................................... 36 Figure 7 Survey Unit 8109 Grid 7 Z-Score and ISOCS Measurement Map ................................. 37 Figure 7 Survey Unit 8109 Grid 8 GPS Scan Results ...................................................................... 38 Figure 7 Survey Unit 8109 Grid 8 Z-Score and ISOCS Measurement Map ................................. 39 Figure 7 Survey Unit 8109 Grid 9 GPS Scan Results ...................................................................... 40 Figure 7 Survey Unit 8109 Grid 9 Z-Score and ISOCS Measurement Map ................................. 41 Figure 7 Survey Unit 8109 Grid 10 GPS Scan Results .................................................................... 42 Figure 7 Survey Unit 8109 Grid 10 Z-Score and ISOCS Measurement Map ............................... 43 Figure 7 Survey Unit 8109 Grid 11 GPS Scan Results .................................................................... 44 Figure 7 Survey Unit 8109 Grid 11 Z-Score Map ............................................................................ 45 Figure 7 Survey Unit 8109 Grid 12 GPS Scan Results .................................................................... 46 Figure 7 Survey Unit 8109 Grid 12 Z-Score Map ............................................................................ 47 Figure 7 Survey Unit 8109 Grid 13 GPS Scan Results .................................................................... 48 Figure 7 Survey Unit 8109 Grid 13 Z-Score and ISOCS Measurement Map ............................... 49 Figure 7 Survey Unit 8109 Grid 14 GPS Scan Results .................................................................... 50 Figure 7 Survey Unit 8109 Grid 14 Z-Score Map ............................................................................ 51 Figure 7 Survey Unit 8109 Grid Sample 15 GPS Scan Results and Sample Location                        ................. 52 Figure 7 Survey Unit 8109 Grid Sample 15 Z-Score Map .............................................................. 53 Figure 16 Survey Unit 8109 Random Samples Location & Scan Areas .......................................... 68 Figure 16 Survey Unit 8109 Judgmental Sample Locations ............................................................. 69 Figure 16 Quantile Plot for Cs-137 Concentration ............................................................................ 79 Figure 16 Histogram for Cs-137 Concentration ................................................................................ 80 Figure 16 Retrospective Power Curve for Survey Unit 8109 ............................................................ 81

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LIST OF ABBREVIATIONS

delta
/          relative shift sigma ALARA        as low as is reasonably achievable BcDCGL       base case derived concentration guideline level BcSOF        base case sum of fractions cpm          counts per minute DQA          data quality assessment DQO          data quality objective DCGL         derived concentration guideline level DCGLW        derived concentration guideline level wide area FCS          Fort Calhoun Station FSS          final status survey GPS          Global Positioning System HTD          hard-to-detect IC           insignificant contributor ISOCS        In Situ Object Counting System LBGR         lower bound of the gray region LT/FSS       License Termination/Final Status Survey LTP          license termination plan m            meter MARSSIM      Multi-Agency Radiation Survey and Site Investigation Manual MDC          minimum detectable concentration mrem/yr      millirem per year NaI          sodium iodide NRC          Nuclear Regulatory Commission OpDCGL       operational derived concentration guideline level

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pCi/g        picocuries per gram QAPP         quality assurance project plan QC           quality control ROC          radionuclides of concern SOF          sum of fractions TEDE         total effective dose equivalent TSD          technical support document UBGR         upper bound of the gray region VSP          Visual Sample Plan

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: 1. EXECUTIVE 

==SUMMARY==

This final status survey (FSS) release record for Survey Unit 8109, North Owner Controlled Area, has been generated in accordance with procedure FCSD-RA-LT-305, Final Status Survey Data Reporting (Reference 1) and satisfies the requirements of Section 5.7.1 of the Fort Calhoun Station Decommissioning Project License Termination Plan (FCS; LTP; Reference 2).
An FSS sample plan for this survey unit was developed in accordance with procedure FCSD-RA-LT-302, Final Status Survey Sample Plan Development (Reference 3), the FCS LTP, and with guidance from NUREG-1575, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM; Reference 4).
Survey Unit 8109, an open land survey unit, has a MARSSIM classification of 3. A survey plan was designed based upon use of the Sign Test as the nonparametric statistical test for compliance.
Both the Type I () and Type II () decision error rates were set at 0.05. As a random sample population, 14 soil samples were acquired from the survey unit. In addition, soil scanning was performed on 10% of the total surface area in the survey unit. The analytical results for all soil samples, both random and judgmental, taken in Survey Unit 8109 indicate that the maximum sum of fractions (SOF), considering the concentration of all applicable radionuclides of concern (ROC), is equal to 0.4195 when applying the respective operational derived concentration guideline levels (OpDCGLs) for soil. Therefore, the null hypothesis is rejected and Survey Unit 8109 is acceptable for unrestricted release. The mean SOF when applying the respective base case derived concentration guideline levels (BcDCGLs) for soil is 0.0303. This SOF equates to a dose for the survey unit of 0.7576 millirem per year (mrem/yr).
: 2. SURVEY UNIT DESCRIPTION

Survey Unit 8109 is an impacted Class 3 open land survey unit. The surface area of the survey unit is 98,266 meters (m)2.

The boundary of the survey unit and the location of the soil samples were defined using a Global Positioning System (GPS). Refer to Attachment 1 of this report for a figure depicting Survey Unit 8109.

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: 3. CLASSIFICATION BASIS

Based on the historical use of this farmland area and no processes involving plant radioactivity, Survey Unit 8109 was identified in the technical support document (TSD) 20-001, Historical Site Assessment for Fort Calhoun Station (Reference 5) as a Class 3 survey unit. The initial site characterization surveys were conducted between November 2019 and July 2020. The following summarizes the results of the characterization survey for Survey Unit 8109 In total, 16 surface soil samples were collected in Survey Unit 8109. All samples from Survey Unit 8109 were analyzed by the on-site gamma spectroscopy system. Cs-137 was identified in three samples at concentrations above the minimum detectable concentration (MDC). Co-60 was not detected at concentrations above MDC in any of the surface soil samples. A summary of the analyses for surface soil samples taken during site characterization are presented in Table 3-1.

No samples from Survey Unit 8109 were selected to be sent for off-site analysis. A summary of the off-site analyses for the overall survey area, 8100, is presented in Table 3-2.

Table 3 Cs-137 and Co-60 Characterization Survey Statistical Quantities Surface Soil               Co-60           Cs-137

                        # of Samples                         16
                          # >MDC                     0                3 Mean picocuries per gram        2.61E-02        7.20E-02 (pCi/g)
Median (pCi/g)             2.47E-02        6.82E-02 Max (pCi/g)              6.32E-02        1.46E-01 Min (pCi/g)             0.00E+00         0.00E+00 Standard Deviation (pCi/g)       1.95E-02        4.40E-02

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Table 3 Off-Site Analysis for Characterization Samples from Survey Unit 8100 Radionuclides      8100X-3-CJ-     8100X-3-CJ-GSSX-       8100X-3-CJ-        8100X-3-CR-GSSX-044              058              GSSX-064           GSSX-003 Am-241            7.07E-02           2.72E-02            4.72E-02           0.00E+00 Sb-125           4.66E-02           2.70E-02            6.77E-02           0.00E+00 C-14           0.00E+00            1.37E-01            1.07E-01           0.00E+00 Ce-144           1.02E-01           0.00E+00            0.00E+00           7.80E-02 Cs-134           8.37E-02           1.87E-02            5.11E-02           4.36E-02 Cs-137           1.72E-01           1.80E-01            1.24E-01           1.29E-01 Co-57            4.55E-03           0.00E+00            6.78E-03           0.00E+00 Co-58           0.00E+00            1.75E-02            0.00E+00           4.06E-02 Co-60           0.00E+00            0.00E+00            0.00E+00           5.21E-03 Cm-242           0.00E+00            0.00E+00            2.57E-02           0.00E+00 Cm-243/244         0.00E+00            3.58E-02            9.67E-02           8.71E-03 Eu-152           6.02E-03           1.11E-03            8.78E-02           0.00E+00 Eu-154          0.00E+00            5.66E-03            1.29E-01           0.00E+00 Eu-155           7.90E-02           1.90E-02            1.79E-02           6.16E-02 Fe-55           2.18E+00            2.45E+00            4.43E+00           3.18E+00 Mn-54            7.75E-03           0.00E+00            1.94E-02           3.03E-02 Np-237          0.00E+00            0.00E+00            8.29E-04           1.12E-03 Ni-59           0.00E+00            0.00E+00            0.00E+00           1.39E-01 Ni-63           0.00E+00            0.00E+00            5.00E-01           4.13E-01 Nb-94            5.79E-02           3.37E-03            3.50E-02           8.78E-03 Pu-238          0.00E+00            2.85E-03            1.50E-02           4.90E-03 Pu-239/240         7.86E-03           1.35E-02            1.73E-02           0.00E+00 Pu-241          1.26E+00            1.36E+00            2.17E+00           0.00E+00 Ag-110m           2.08E-02           0.00E+00            7.33E-02           0.00E+00 Sr-90            1.33E-01           1.09E-01            1.33E-01           1.44E-01 Tc-99           0.00E+00            0.00E+00            0.00E+00           0.00E+00 H-3            0.00E+00            0.00E+00            0.00E+00           0.00E+00 Zn-65            7.12E-02           2.89E-03            8.45E-03           4.71E-03

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Radionuclides      8100X-3-CR-        8100X-3-CR-         8100X-3-CR-        8100X-3-CR-GSSX-021            GSSX-027           GSSX-029           GSSX-038 Am-241            1.20E-02            1.26E-02           0.00E+00           0.00E+00 Sb-125            1.16E-01            2.24E-02           1.74E-03           1.22E-01 C-14             0.00E+00            4.79E-01           0.00E+00           2.73E-01 Ce-144            2.28E-01            7.07E-02           0.00E+00           2.41E-01 Cs-134            0.00E+00            4.96E-02           9.19E-02           0.00E+00 Cs-137            2.05E-01            3.08E-01           4.96E-01           1.41E-01 Co-57            2.37E-03           0.00E+00            5.95E-02           8.79E-03 Co-58            6.82E-02           0.00E+00            6.93E-02           4.28E-02 Co-60            2.29E-02            2.98E-02           0.00E+00           0.00E+00 Cm-242            0.00E+00           0.00E+00            0.00E+00           0.00E+00 Cm-243/244          2.23E-02            2.50E-02           1.20E-02           7.52E-03 Eu-152            0.00E+00           0.00E+00            2.82E-01           2.67E-02 Eu-154            3.91E-02            7.78E-02           7.35E-03           0.00E+00 Eu-155            4.19E-02            5.79E-02           6.79E-02           0.00E+00 Fe-55            1.88E+00           0.00E+00            2.30E+00           4.32E+00 Mn-54             3.95E-03            4.56E-02           0.00E+00           4.32E-03 Np-237            1.39E-03            1.89E-03           0.00E+00           0.00E+00 Ni-59            7.57E-01            7.73E-01           0.00E+00           1.17E+00 Ni-63            3.50E-01           0.00E+00            4.64E-01           4.66E-01 Nb-94            1.54E-02           0.00E+00            1.79E-01           0.00E+00 Pu-238            0.00E+00            5.67E-03           1.90E-02           4.82E-03 Pu-239/240          2.29E-02            1.16E-02           9.91E-03           1.06E-02 Pu-241            0.00E+00            8.17E-01           1.76E+00           1.70E+00 Ag-110m            0.00E+00           0.00E+00            0.00E+00           6.39E-02 Sr-90            5.79E-02           0.00E+00            3.00E-02           0.00E+00 Tc-99            0.00E+00           0.00E+00            0.00E+00           6.42E-03 H-3             0.00E+00           0.00E+00            0.00E+00           0.00E+00 Zn-65            0.00E+00           0.00E+00            0.00E+00           0.00E+00 Note: Bold values indicate concentration greater than MDC. Unbolded values indicate the value below MDC. All values in pCi/g.

Based upon a review of the historical information, the results of the characterization survey data, and completion of a Survey Unit Classification Worksheet, the correct final classification of Survey Unit 8109 was determined to be Class 3.
: 4. DATA QUALITY OBJECTIVES

FSS planning and design rely on a properly executed data quality objective (DQO) process to ensure, through compliance with explicitly defined inputs and boundaries, that the primary objective of the survey is satisfied. The DQO process, utilized in accordance with MARSSIM, is

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described in the FCS LTP. The appropriate design for a given survey was developed using the DQO process as outlined in Appendix D of MARSSIM. The seven steps of the DQO process are summarized in the following paragraphs.
The DQO process incorporated hypothesis testing and probabilistic sampling distributions to control decision errors during data analysis. Hypothesis testing is a process based on the scientific method that compares a baseline condition to an alternate condition. The baseline condition is technically known as the null hypothesis. Hypothesis testing rests on the premise that the null hypothesis is true and sufficient evidence must be provided to reject it in favor on the alternative hypothesis. In designing the survey plan, the underlying assumption, or null hypothesis was that residual activity in the survey unit exceeded the release criteria. Rejection of the null hypothesis would indicate that residual activity within the survey unit does not exceed the release criteria.
Therefore, the survey unit would satisfy the primary objective of the FSS sample plan.
The primary objective of the FSS sample plan is to demonstrate that the level of residual radioactivity in Survey Unit 8109 did not exceed the release criteria specified in the LTP and that the potential dose from residual radioactivity is as low as is reasonably achievable (ALARA).
TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan (Reference 6) establishes the basis for an initial suite of potential ROC for decommissioning. LTP Chapter 2 provides detailed characterization data that describes the results of surveys completed of soil. Surface samples were taken in each impacted open land survey unit and analyzed for the presence of plant-derived radionuclides. The results of surface soil characterization in the impacted area surrounding FCS indicate that there is minimal residual radioactivity in soil.
ICs were determined consistent with the guidance contained in Section 3.3 of NUREG-1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance      - Characterization, Survey, and Determination of Radiological Criteria (Reference 7). For soil, the ROCs were found to be Cs-137, Co-60, Eu-152, and C-14. The remaining radionuclides were designated as IC and were eliminated from further detailed evaluation.
Section 5.2.6 of the LTP states that each radionuclide specific BcDCGL is equivalent to the level of residual radioactivity (above background levels) that could, when considered independently, result in a total effective dose equivalent (TEDE) of 25 mrem/yr to an Average Member of the Critical Group. To ensure that the summation of dose from each source term is 25 mrem/yr or less after all FSS is completed, the BcDCGLs are reduced based on an expected, or a priori, fraction of the 25 mrem/yr dose limit from each source term. The reduced DCGLs (i.e., OpDCGLs) can be related to the BcDCGLs as an expected fraction of dose based on an a priori assessment of what the expected dose should be based on the results of site characterization, process knowledge, and the extent of planned remediation. The OpDCGL is then used as the DCGL for the FSS design of the survey unit (e.g., calculation of surrogate DCGLs or, investigation levels). Details of the

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OpDCGLs derived for each dose component and the basis for the applied a priori dose fractions are provided in Section 5.2.6 of the LTP.
Multiple ROCs are known to be present at FCS. The dose contribution from each ROC is accounted for using the SOF to ensure that the total dose from all ROC does not exceed the dose criterion. A BcDCGL that is established for the average residual radioactivity in a survey unit is equivalent to a derived concentration guideline level wide area (DCGLW) as defined in MARSSIM.
At FCS, compliance is demonstrated through the summation of dose from seven distinct source terms (i.e., basements, soils, buried pipe, embedded pipe, above-ground structures, basement fill, and groundwater) for the end state. When applied to soil, the DCGLs are expressed in units of activity per unit of mass (pCi/g).
For FCS, soil is defined as a layer of soil beginning at the surface but extending to a depth of 1 m to allow for flexibility in compliance demonstration if contamination deeper than 0.15 m is encountered. Based on characterization data and historical information, there are no expectations of encountering a source term geometry that is comprised of a clean surface layer of soil over a contaminated subsurface soil layer. Section 6.9 of the LTP provides the exposure scenarios and modeling parameters that were used to calculate the site-specific soil DCGLs. The adjusted soil DCGLs for the unrestricted release of open land survey units as provided in the Section 6.16 of the LTP are presented in Table 4-1. The IC dose percentage of 5% was used to adjust the DCGLs in Table 4-1 to account for the dose from the eliminated IC radionuclides.

Table 4 Base Case DCGLs for Soil Surface Soil     Subsurface Radionuclide      BcDCGL         Soil BcDCGL (pCi/g)          (pCi/g)
C-14         5.70E+01         9.68E+00 Co-60         3.77E+00         2.93E+00 Cs-137        1.31E+01         7.27E+00 Eu-152         8.41E+00         7.36E+00

The reduced DCGLs, OpDCGLs, are calculated using Equation 5-1 from Chapter 5 of the LTP, shown below.

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Equation 4 OpDCGL Calculation

The OpDCGLs for the unrestricted release of soil are provided in Table 4-2.

Table 4 OpDCGLs for Soil Surface Soil      Subsurface Radionuclide        OpDCGL         Soil OpDCGL (pCi/g)           (pCi/g)
C-14            1.59E+01          2.71E+00 Co-60           1.06E-00          8.21E-01 Cs-137           3.65E+00          2.04E-00 Eu-152           2.36E+00          2.06E-00

Instrument DQOs included a verification of the ability of the survey instrument to detect the radiations of interest relative to the OpDCGL. Survey instrument response checks were required prior to issuance and after the instrument had been used. Control and accountability of survey instruments were required to assure the quality and prevent the loss of data.
As part of the DQOs applied to laboratory processes, analysis results were reported as actual calculated results. The actual reported value was used as the recorded FSS result for measurement and sample values that are less than MDC. Negative values were recorded as zero. Results were not reported as less than MDC. Sample report summaries included unique sample identification, analytical method, radionuclide, result, uncertainty, laboratory data qualifiers, units, and the observed MDC.
In accordance with the LTP, for laboratory analysis, MDCs less than 10% of the OpDCGL were preferable while MDCs up to 50% of the OpDCGL were acceptable. The minimum acceptable MDC for measurements obtained using field instruments was 50% of the applicable OpDCGL.

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: 5. SURVEY DESIGN

The level of effort associated with planning a survey is based on the complexity of the survey and nature of the hazards. Guidance for preparing FSS plans is provided in procedure FCSD-RA-LT-302, Final Status Survey Sample Plan Development (Reference 3).
The DQO process validated that Co-60, Cs-137, Eu-152, and C-14 would be the ROCs in Survey Unit 8109 as presented in LTP Section 5.2.5. As discussed in LTP Section 5.2.6.2, instead of inferring the concentrations for hard-to-detect (HTD) C-14 using a surrogate approach, 100% of all samples collected in the survey unit were sent for off-site analysis for C-14. Table 5-1 presents the action levels for Survey Unit 8109 sample results and are based on 50% of the OpDCGL.

Table 5 Action Levels for Survey Unit 8109 ROC                      Action Level (pCi/g)
C-14                      7.95E+00 Co-60                      5.30E-01 Cs-137                     1.83E+00 Eu-152                     1.18E+00

The Sign Test was selected as the nonparametric statistical test to demonstrate compliance with the release criteria. The use of the Sign Test did not require the selection or use of a background reference area, which simplified survey design and implementation. This approach was conservative since it included background Cs-137 as part of the sample set.
The number of soil samples for FSS was determined in accordance with procedure FCSD-RA-LT-302. (Reference 3). The relative shift (/) for the survey unit data set is defined as shift (),
which is the upper boundary of the gray region (UBGR), or the DCGL (SOF of 1), minus the lower bound of the gray region (LBGR), divided by sigma (), which is the standard deviation of the data set used for survey design. The optimal value for / should range between 1 and 3. The largest value the / can have is 3. If the calculated value of / exceeds 3, an adjusted value of 3 will be used for /. The / for Survey Unit 8109, based on the data for surface soil samples collected during the characterization of Survey Unit 8109, was calculated as follows:

Equation 5 Relative Shift
                                    =   (1  0.0717) =  25.8 0.036
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As the calculated / was greater than 3, a value of 3 was used as the adjusted /. Both the Type I error (i.e.,  value) and the Type II error (i.e.,  value) were set at 0.05. The sample size from Table 5.5 of MARSSIM that equates to the Type I and Type II error of 0.05 for use with the Sign Test is an N value of 14.
A prospective power curve was generated using MARSSIM Power 2000, a software package developed under the sponsorship of the United States Nuclear Regulatory Commission (NRC) for implementation of the MARSSIM in support of the decommissioning license termination rule (10 CFR 20, Subpart E). The result of the MARSSIM Power 2000 computer run showed adequate power for the survey design.
Given that Survey Unit 8109 is Class 3, sample locations were selected randomly. The random locations of the soil samples were selected using a Visual Sample Plan (VSP), in accordance with FCSD-RA-LT-302 (Reference 3). Input parameters included use of aerial photographs and the random sampling tool set with a predetermined number (14) of samples. The random coordinates generated with VSP were integrated with a GPS to identify the sample locations in the field.
Table 5-2 lists the random samples collected for FSS and the corresponding GPS coordinates, based on the Nebraska State Plane North American Datum 1983 coordinate system.

Table 5 Random Sample Locations Sample ID                   Northing             Easting 8109X-3-FR-GSSX-001              194337.144           826345.446 8109X-3-FR-GSSX-002              194409.195           826663.118 8109X-3-FR-GSSX-003              194289.111           826504.282 8109X-3-FR-GSSX-004              194361.161           826821.953 8109X-3-FR-GSSX-005              194433.212           826424.864 8109X-3-FR-GSSX-006              194313.128           826742.535 8109X-3-FR-GSSX-007              194385.178           826538.700 8109X-3-FR-GSSA-008              194323.802           826643.263 8109X-3-FR-GSSX-009              194395.853           826484.427 8109X-3-FR-GSSX-010              194374.819           826405.009 8109X-3-FR-GSSX-011              194419.870           826722.681 8109X-3-FR-GSSX-012              194299.785           826563.845 8109X-3-FR-GSSX-013              194371.836           826881.517 8109X-3-FR-GSSX-014              194443.886           826365.300

In accordance with the sample plan, at least one judgmental sample is required from the survey unit. The number of judgmental samples and measurements collected was 38, which brings the total number of samples collected for the FSS of Survey Unit 8109 to 52. Table 5-3 lists the judgmental samples or measurements collected for FSS and the corresponding GPS coordinates.

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Table 5 Judgmental Sample or Measurement Locations Sample ID             Northing            Easting 8109X-3-FJ-GSSX-015       194366.086         826881.619 8109X-3-FJ-GGDX-016        194331.669         826352.584 8109X-3-FJ-GGDX-017        194345.850         826352.839 8109X-3-FJ-GGDX-018        194344.903         826356.555 8109X-3-FJ-GGDX-019        194340.898         826366.487 8109X-3-FJ-GGDX-020        194351.525         826414.378 8109X-3-FJ-GGDX-021        194369.630         826414.242 8109X-3-FJ-GGDX-022        194346.628         826400.974 8109X-3-FJ-GGDX-023        194343.730         826400.056 8109X-3-FJ-GGDX-024        194369.013         826404.145 8109X-3-FJ-GGDX-025        194350.396         826399.767 8109X-3-FJ-GGDX-026        194354.274         826399.139 8109X-3-FJ-GGDX-027        194383.424         826854.576 8109X-3-FJ-GGDX-028        194372.554         826866.727 8109X-3-FJ-GGDX-029        194374.538         826871.066 8109X-3-FJ-GGDX-030        194360.007         826678.024 8109X-3-FJ-GGDX-031        194363.870         826658.532 8109X-3-FJ-GGDX-032        194322.537         826626.169 8109X-3-FJ-GGDX-033        194326.770         826631.085 8109X-3-FJ-GGDX-034        194328.598         826633.057 8109X-3-FJ-GGDX-035        194328.506         826635.099 8109X-3-FJ-GGDX-036        194308.145         826641.432 8109X-3-FJ-GSSX-037       194311.873         826650.955 8109X-3-FJ-GSSX-038       194332.215         826648.208 8109X-3-FJ-GSSX-039       194372.670         826475.440 8109X-3-FJ-GSSX-040       194386.883         826472.427 8109X-3-FJ-GSSX-041       194389.431         826469.940 8109X-3-FJ-GGDX-042        194379.329         194379.329 8109X-3-FJ-GGDX-043        194343.838         826795.706 8109X-3-FJ-GGDX-044        194350.982          826586.584 8109X-3-FJ-GGDX-045        194429.238         826406.155 8109X-3-FJ-GGDX-046        194430.636         826416.741

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Sample ID                Northing              Easting 8109X-3-FJ-GGDX-047           194439.580           826419.524 8109X-3-FJ-GGDX-048           194427.421           826422.080 8109X-3-FJ-GGDX-049           194441.417           826426.475 8109X-3-FJ-GSSX-050           194369.630           826414.242 8109X-3-FJ-GSSX-051           194322.537           826626.169 8109X-3-FJ-GSSX-052           194326.770           826631.805

In accordance with Section 5.2.6.2 of the LTP, the actual measured concentrations of the HTD ROC C-14 will be used in lieu of inference by surrogate for soil samples.

The implementation of quality control measures as referenced by Section 5.6.3 of the LTP and FCSD-RA-LT-100, Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station (QAPP; Reference 8) includes the collection of a soil sample for split sample analysis on 5% of the soil samples taken in a survey unit with the locations selected at random. Five soil samples or measurements, 8109X-3-FQ-GSSX-005, 8109X-3-FQ-GGDX-008, 8109X-3-FR-GSSB-011, 8109X-3-FQ-GGDX-031, 8109X-3-FQ-GGDX-034 were designated for split or duplicate sample quality control (QC) analysis for the FSS of Survey Unit 8109.
Section 5.3.4 and Table 5-20 of the LTP specify that for Class 3 open land survey units, surface scans will be performed on a judgmental percentage of the surface area in the survey unit. For Survey Unit 8109, 10% scan coverage was selected, which equals 9,827 m2.

For this Class 3 open land survey unit, the Investigation Levels for area scanning and soil sample measurement results are those levels specified in the Table 5-24 of the LTP and are reproduced below in Table 5-4. Table 5-5 presents a synopsis of the survey design.

Table 5 Investigation Levels Classification           Scan Investigation Levels              Direct Investigation Levels Class 3          >Operational DCGL or >MDCscan if         >0.5 Operational DCGL MDCscan is greater than Operational DCGL

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Table 5 Synopsis of Survey Design Feature                      Design Criteria                      Basis Survey Unit Surface Area                98,266 m2                          GPS

Number of Random Samples                    14                  *  / = 3 (adjusted)
(N)
* MARSSIM Table 5.5
* Co-60:  1.06 pCi/g DCGLs
* Cs-137: 3.65 pCi/g          Operational DCGLs for soil,
* Eu-152: 2.36 pCi/g                LTP, Table 5-8
* C-14:    15.9 pCi/g Scan and Direct Investigation             Table 5-4                    LTP, Table 5-24 Levels Scan Areal Coverage          9,827 m2 (10% areal coverage)         LTP, Table 5-20

Judgmental                            1                       Per Survey Design Measurements/Samples                      38                     Actual Number Obtained HTD ROC Analysis                       100%                      LTP, Section 5.2.6.2 18                  Number  of Samples Analyzed 5% of the total number of          LTP, Section 5.6.3 QC                  samples/measurements collected     Actual Number Obtained `
5
: 6. SURVEY IMPLEMENTATION

For Survey Unit 8109, compliance with the unrestricted release criteria was demonstrated through a combination of soil scanning with a Ludlum Model 44-20 gamma detector and the sampling of soil for isotopic analysis. A portable In Situ Object Counting System (ISOCS) unit was also utilized to investigate areas identified by scanning with the Ludlum Model 44-20 gamma detector.
A License Termination/Final Status Survey (LT/FSS) Supervisor performed a visual inspection and walk-down of the survey unit on April 28, 2022, prior to performing FSS. The purpose of the walk-down was to assess the physical condition of the survey unit, evaluate access points and travel paths, and identify potentially hazardous conditions. At the time of survey, the soil in the survey unit was dry and free of any considerable constraint for the collection of samples and scan measurements.
FSS field activities were conducted under the FSS sample plan and included DQOs, survey design, detailed FSS instructions, job safety analysis, and related procedures for reference. FSS field activities were projected to take 10 working days to complete. Daily briefings were conducted to discuss the expectations for job performance and to review the safety aspects of the

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job. A Field Log was used to document field activities and other information pertaining to the performance of the FSS. FSS field activities commenced on May 16, 2022, and concluded on July 26, 2022.
A total of 15 different scan areas were scanned using a Ludlum Model 3001 paired with a Ludlum Model 44-20 (3 x 3) sodium iodide (NaI) detector and a Trimble GPS unit. The background was established as the average of five one-minute static measurements, while maintaining the detector a minimum of 6 from the soil. In Survey Unit 8109, background ranged from 27,400 counts per minute (cpm) up to 28,920 cpm.
All designated scan areas were scanned using the Model 44-20 detector operated in the rate-meter mode and using audio response. The probe was positioned no more than 2 from the ground and was moved at a scan speed of approximately 0.25 m per second. In accordance with FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors (Reference 9), scan MDC was sufficient to detect residual radioactivity at the action level. Complete scan results are provided in Attachment 2.
The 14 random sample locations were marked with flags based on GPS coordinates provided.
Each soil sample consisted of approximately 1 liter of soil. The soil sample media was sifted to remove stones and other media larger than 1 centimeter in diameter. All soil samples were collected, controlled, transported, stored, and transferred to the on-site laboratory using the chain-of-custody process from FCSD-RA-LT-205, Chain-of-Custody Protocol for Site Characterization and Final Status Survey (Reference 10), and in accordance with FCSD-RA-LT-203, Sample Media Collection for Site Characterization and Final Status Survey (Reference 11), and FCSD-RA-LT-204, Sample Media Preparation for Site Characterization and Final Status Survey (Reference 12).
The survey design specified that 100% of the physical samples were required for the HTD ROC analysis. In total, 18 samples were selected for HTD radionuclide analysis.
The implementation of survey specific QC measures included the collection of 5 samples (8109X-3-FQ-GSSX-005, 8109X-3-FQ-GGDX-008, 8109X-3-FR-GSSB-011, 8109X-3-FQ-GGDX-031, 8109X-3-FQ-GGDX-034) for split or duplicate sample analysis.

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: 7. SURVEY RESULTS

All areas identified in the FSS sample plan were scanned for elevated activity levels. By scanning accessible land within Survey Unit 8109, the 9,826 m2 scan requirement was achieved.
Error! Reference source not found. presents the scan areas within the unit. Table 7-1 provides an overview of the scan results of the gamma walkovers. Attachment 2, Table 16-1, provides the complete scan results.

Table 7 Synopsis of Scan Results

Min Scan    Max Scan      Action       Scan Scan Area      Logged      Logged       Level      Alarms?      Judgmental Reading      Reading      (cpm)       (Y/N)     Measurements (cpm)        (cpm) 1         19953        30706       29501         Y              4 2         19590        31009       29153         Y              2 3         16733        31462       29522         Y              0 4         15417        31918       30220         Y              1 5         18004        31615       29584         Y              0 6         15030        31770       29973         Y              0 7         20689        31172       29543         Y              1 8         22060        30409       29440         Y              7 9         16007        31024       29707         Y              4 10         21225        31486       29953         Y              7 11         14964        31323       29419         Y              0 12         17425        31835       29809         N              0 13         23680        31720       30404         Y              3 14         17230        31480       29686         Y              0 15         20736        29663       28845         Y              0 QC 5        26074        31577       30220         Y              5

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For the Survey Unit 8109 Grid 1, count rates ranged between 19,953 cpm and 30,706 cpm, with a mean count rate of 28,056 cpm and a standard deviation of 791 cpm. Figure 7-1 below presents a map of the gamma walkover for Survey Unit 8109 Grid 1.

Figure 7 Survey Unit 8109 Grid 1 GPS Scan Results

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An evaluation of the Survey Unit 8109 Grid 1 data set was performed to assess  the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Scores). Four locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. The elevated areas were investigated using ISOCS. Figure 7-2 below presents a map of the +3 Z-Scores measurements within Survey Unit 8109 Grid 1 and the selected biased ISOCS measurement locations.

Figure 7 Survey Unit 8109 Grid 1 Z-Score and ISOCS Measurement Map

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For Survey Unit 8109 Grid 2, count rates ranged between 19,590 cpm and 31,009 cpm, with a mean count rate of 27,870 cpm and a standard deviation of 977 cpm. Figure 7-3 below presents a map of the gamma walkover for Survey Unit 8109 Grid 2.

Figure 7 Survey Unit 8109 Grid 2 GPS Scan Results

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An evaluation of the Survey Unit 8109 Grid 2 data set was performed to assess  the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Scores). Two locations selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. The elevated areas were investigated using ISOCS. Figure 7-4 below presents a map of the +3 Z-Scores measurements within Survey Unit 8109 Grid 2 and the selected biased ISOCS measurement locations.

Figure 7 Survey Unit 8109 Grid 2 Z-Score and ISOCS Measurement Map

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For Survey Unit 8109 Grid 3, count rates ranged between 16,733 cpm and 31,462 cpm, with a mean count rate of 27,917 cpm and a standard deviation of 1,916 cpm. Figure 7-5 below presents a map of the gamma walkover for Survey Unit 8109 Grid 3.

Figure 7 Survey Unit 8109 Grid 3 GPS Scan Results

29,522 29,522

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An evaluation of the Survey Unit 8109 Grid 3 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Scores). There were no locations selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-6 below presents a map of the +3 Z-Scores measurements within Survey Unit 8109 Grid 3.

Figure 7 Survey Unit 8109 Grid 3 Z-Score Map

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For Survey Unit 8109 Grid 4, count rates ranged between 15,417 cpm and 31,918 cpm, with a mean count rate of 28,393 cpm and a standard deviation of 1,093 cpm. Figure 7-7 below presents a map of the gamma walkover for Survey Unit 8109 Grid 4.

Figure 7 Survey Unit 8109 Grid 4 GPS Scan Results

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An evaluation of the Survey Unit 8109 Grid 4 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Scores). One location was selected for biased sample collection based on evaluation of the gamma walkover data. This biased location represents the maximum measurements encountered within the scan area. The elevated area was investigated using ISOCS. Figure 8below presents a map of the +3 Z-Scores measurements within Survey Unit 8109 Grid 4 and the selected biased ISOCS measurement location.

Figure 8- Survey Unit 8109 Grid 4 Z-Score and ISOCS Measurement Map

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For Survey Unit 8109 Grid 5, count rates ranged between 18,004 cpm and 31,615 cpm, with a mean count rate of 28,324 cpm and a standard deviation of 1,307 cpm. Figure 7-9 below presents a map of the gamma walkover for Survey Unit 8109 Grid 5.

Figure 7 Survey Unit 8109 Grid 5 GPS Scan Results

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An evaluation was performed with the Survey Unit 8109 Grid 5 data set to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement. No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-10 below presents a map of the +3 Z-Scores measurements within Survey Unit 8109 Grid 5.

Figure 7 Survey Unit 8109 Grid 5 Z-Score Map

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For Survey Unit 8109 Grid 5QC count rates ranged between 26,074 cpm and 31,577 cpm, with a mean count rate of 28,796 cpm and a standard deviation of 778 cpm. Figure 7-11 below presents a map of the gamma walkover for Survey Unit 8109 Grid 5QC.

Figure 7 Survey Unit 8109 Grid 5QC GPS Scan Results

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An evaluation of the Survey Unit 8109 Grid 5QC data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Scores). There were five locations selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. The elevated areas were investigated using ISOCS. Figure 7-12 below presents a map of the +3 Z-Scores measurements within Survey Unit 8109 Grid 5QC and the selected biased ISOCS measurement locations.

Figure 7 Survey Unit 8109 Grid 5QC Z-Score and ISOCS Measurement Map

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For Survey Unit 8109 Grid 6, count rates ranged between 15,030 cpm and 31,770 cpm, with a mean count rate of 28,475 cpm and a standard deviation of 1,486 cpm. Figure 7-13 below presents a map of the gamma walkover for Survey Unit 8109 Grid 6.

Figure 7 Survey Unit 8109 Grid 6 GPS Scan Results

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An evaluation of the Survey Unit 8109 Grid 6 data set was performed to assess  the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Scores). No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-14 below presents a map of the +3 Z-Scores measurements within Survey Unit 8109 Grid 6.

Figure 7 Survey Unit 8109 Grid 6 Z-Score Map

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For Survey Unit 8109 Grid 7, count rates ranged between 20,689 cpm and 31,172 cpm, with a mean count rate of 28,112 cpm and a standard deviation of 932 cpm. Figure 15 below presents a map of the gamma walkover for Survey Unit 8109 Grid 7.

Figure 15 - Survey Unit 8109 Grid 7 GPS Scan Results

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An evaluation of the Survey Unit 8109 Grid 7 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Scores). One location was selected for biased sample collection based on evaluation of the gamma walkover data. This biased location represents the maximum measurement encountered within the scan area. The elevated area was investigated using ISOCS. Figure 16 below presents a map of the +3 Z-Scores measurements within Survey Unit 8109 Grid 7 and the selected biased ISOCS measurement location.

Figure 16 - Survey Unit 8109 Grid 7 Z-Score and ISOCS Measurement Map

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For Survey Unit 8109 Grid 8, count rates ranged between 22,060 cpm and 30,409 cpm, with a mean count rate of 27,749 cpm and a standard deviation of 771 cpm. Figure 17 below presents a map of the gamma walkover for Survey Unit 8109 Grid 8.

Figure 17 - Survey Unit 8109 Grid 8 GPS Scan Results

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An evaluation of the Survey Unit 8109 Grid 8 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Scores). Seven locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. The elevated areas were investigated using ISOCS. Figure 7-18 below presents a map of the +3 Z-Scores measurements within Survey Unit 8109 Grid 8 and the selected biased ISOCS measurement locations.

Figure 7 Survey Unit 8109 Grid 8 Z-Score and ISOCS Measurement Map

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For Survey Unit 8109 Grid 9, count rates ranged between 16,007 cpm and 31,024 cpm, with a mean count rate of 28,273 cpm and a standard deviation of 838 cpm. Figure 19 below presents a map of the gamma walkover for Survey Unit 8109 Grid 9.

Figure 19 - Survey Unit 8109 Grid 9 GPS Scan Results

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An evaluation was performed with the Survey Unit 8109 Grid 9 data set; assessing the small areas of elevated activity which exceeded three standard deviations above the mean measurement. Four locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. The elevated areas were investigated using ISOCS. Figure 20 below presents a map of the
+3 Z-Scores measurements within Survey Unit 8109 Grid 9 and the selected biased ISOCS measurement locations.

Figure 20 - Survey Unit 8109 Grid 9 Z-Score and ISOCS Measurement Map

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For Survey Unit 8109 Grid 10, count rates ranged between 21,225 cpm and 31,486 cpm, with a mean count rate of 28,648 cpm and a standard deviation of 814 cpm. Figure 21 below presents a map of the gamma walkover for Survey Unit 8109 Grid 10.

Figure 21 - Survey Unit 8109 Grid 10 GPS Scan Results

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An evaluation of the Survey Unit 8109 Grid 10 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Scores). Seven locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. The elevated areas were investigated using ISOCS. Figure 22 below presents a map of the +3 Z-Scores measurements within Survey Unit 8109 Grid 10 and the selected biased ISOCS measurement locations.

Figure 22 - Survey Unit 8109 Grid 10 Z-Score and ISOCS Measurement Map

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For Survey Unit 8109 Grid 11, count rates ranged between 14,964 cpm and 31,323 cpm, with a mean count rate of 27,861 cpm and a standard deviation of 1,216 cpm. Figure 23 below presents a map of the gamma walkover for Survey Unit 8109 Grid 11.

Figure 23 - Survey Unit 8109 Grid 11 GPS Scan Results

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An evaluation of the Survey Unit 8109 Grid 11 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Scores). No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 24 below presents a map of the +3 Z-Scores measurements within Survey Unit 8109 Grid 11.

Figure 24 - Survey Unit 8109 Grid 11 Z-Score Map

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For Survey Unit 8109 Grid 12, count rates ranged between 17,425 cpm and 31,835 cpm, with a mean count rate of 28,418 cpm and a standard deviation of 1,312 cpm. Figure 25 below presents a map of the gamma walkover for Survey Unit 8109 Grid 12.

Figure 25 - Survey Unit 8109 Grid 12 GPS Scan Results

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An evaluation of the Survey Unit 8109 Grid 12 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Scores). No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 26 below presents a map of the +3 Z-Scores measurements within Survey Unit 8109 Grid 12.

Figure 26 - Survey Unit 8109 Grid 12 Z-Score Map

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For Survey Unit 8109 Grid 13, count rates ranged between 23,680 cpm and 31,720 cpm, with a mean count rate of 28,613 cpm and a standard deviation of 930 cpm. Figure 27 below presents a map of the gamma walkover for Survey Unit 8109 Grid 13.

Figure 27 - Survey Unit 8109 Grid 13 GPS Scan Results

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An evaluation of the Survey Unit 8109 Grid 13 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Scores). Three locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. The elevated areas were investigated using ISOCS. Figure 28 below presents a map of the +3 Z-Scores measurements within Survey Unit 8109 Grid 13, and the selected biased ISOCS measurement locations.

Figure 28 - Survey Unit 8109 Grid 13 Z-Score and ISOCS Measurement Map

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For Survey Unit 8109 Grid 14, count rates ranged between 17,230 cpm and 31,480 cpm, with a mean count rate of 28,494 cpm and a standard deviation of 1,096 cpm. Figure 29 below presents a map of the gamma walkover for Survey Unit 8109 Grid 14.

Figure 29 - Survey Unit 8109 Grid 14 GPS Scan Results

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An evaluation of the Survey Unit 8109 Grid 14 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Scores). No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 30 below presents a map of the +3 Z-Scores measurements within Survey Unit 8109 Grid 14.

Figure 30 - Survey Unit 8109 Grid 14 Z-Score Map

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For Survey Unit 8109 Grid Sample 15, count rates ranged between 20,736 cpm and 29,663 cpm, with a mean count rate of 27,514 cpm and a standard deviation of 771 cpm. Figure 31 below presents a map of the gamma walkover for Survey Unit 8109 Grid Sample 15. The location was selected as a biased location due to high foot traffic, darker soil, and the location being a low point in the area.

Figure 31 - Survey Unit 8109 Grid Sample 15 GPS Scan Results and Sample Location

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An evaluation of the Survey Unit 8109 Grid Sample 15 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e., +3 Z-Scores). No locations other than the original biased location were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 32 below presents a map of the +3 Z-Scores measurements within Survey Unit 8109 Grid Sample 15.

Figure 32 - Survey Unit 8109 Grid Sample 15 Z-Score Map

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The on-site laboratory analyzed the 14 soil samples taken for nonparametric statistical testing using the on-site gamma spectroscopy system. A summary of the results for the 14 samples collected for nonparametric statistical testing is provided in Table 7-1. Gamma spectroscopy results revealed that Cs-137 was detected in only one 1 of the 14 random samples. The off-site laboratory, GEL Laboratories, analyzed the 14 random samples for the HTD ROC C-14. C-14 was not detected in any of the 14 random samples. The maximum operational sum of fractions (OpSOF) for random samples is 0.2711.
The basic statistics for the random sample population, as compared to the BcDCGLs, and the survey unit dose are summarized in Table 7-3.
The SOF or unity rule is the mathematical test used to evaluate compliance with radiological criteria for license termination when more than one radionuclide has been determined to be potentially present. The equation for the unity rule is:

Equation 7 Unity Rule

Where:           Cn         =  concentration of radionuclide n DCGLn      =  DCGL of radionuclide n.

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Samples Comprising the Statistical Sample Population

Weight              Activity  Operational    Fraction Sample ID                     ROC      (pCi/g)      DCGL            of      OpSOF (g)                           (pCi/g)     OpDCGL

Co-60     2.56E-02    1.06E+00      2.42E-02 8109X-3-FR -GSSX-001      434.7   Cs-137    1.01E-01    3.65E+00      2.77E-02   0.14031 Eu-152    1.94E-01    2.36E+00      8.22E-02 C-14     1.00E-01    1.59E+01      6.29E-03 Co-60     1.82E-01    1.06E+00      1.72E-01 8109X-3-FR -GSSX-002      346.8   Cs-137    2.37E-01    3.65E+00      6.49E-02   0.26141 Eu-152   0.00E+00     2.36E+00      0.00E+00 C-14     3.94E-01    1.59E+01      2.48E-02 Co-60     8.98E-02    1.06E+00      8.47E-02 8109X-3-FR -GSSX-003       414    Cs-137   0.00E+00     3.65E+00      0.00E+00   0.08733 Eu-152   0.00E+00     2.36E+00      0.00E+00 C-14     4.16E-02    1.59E+01      2.62E-03

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Weight             Activity  Operational    Fraction Sample ID                    ROC      (pCi/g)      DCGL           of      OpSOF (g)                           (pCi/g)    OpDCGL

Co-60    4.53E-02    1.06E+00     4.27E-02 8109X-3-FR-GSSX-004      445.9   Cs-137    5.30E-02    3.65E+00     1.45E-02    0.08770 Eu-152    0.00E+00    2.36E+00     0.00E+00 C-14     4.84E-01    1.59E+01     3.04E-02 Co-60    0.00E+00    1.06E+00     0.00E+00 8109X-3-FR-GSSX-005      440.7   Cs-137    2.79E-03    3.65E+00     7.64E-04    0.03034 Eu-152    5.11E-02    2.36E+00     2.17E-02 C-14     1.26E-01    1.59E+01     7.92E-03 Co-60    0.00E+00    1.06E+00     0.00E+00 8109X-3-FR-GSSX-006      429.8   Cs-137    0.00E+00    3.65E+00     0.00E+00    0.01711 Eu-152    0.00E+00    2.36E+00     0.00E+00 C-14     2.72E-01    1.59E+01     1.71E-02 Co-60    0.00E+00    1.06E+00     0.00E+00 8109X-3-FR -GSSX-007     443.5   Cs-137    0.00E+00    3.65E+00     0.00E+00    0.00811 Eu-152    0.00E+00    2.36E+00     0.00E+00 C-14     1.29E-01    1.59E+01     8.11E-03 Co-60    2.13E-01    1.06E+00     2.01E-01 8109X-3-FR -GSSX-008     446.2   Cs-137    1.25E-01    3.65E+00     3.42E-02    0.23519 Eu-152    0.00E+00    2.36E+00     0.00E+00 C-14     0.00E+00    1.59E+01     0.00E+00 Co-60    0.00E+00    1.06E+00     0.00E+00 8109X-3-FR-GSSX-009      417.3   Cs-137    2.02E-01    3.65E+00     5.53E-02    0.07283 Eu-152    0.00E+00    2.36E+00     0.00E+00 C-14     2.78E-01    1.59E+01     1.75E-02 Co-60    0.00E+00    1.06E+00     0.00E+00 8109X-3-FR-GSSX-010      420.8   Cs-137    1.75E-01    3.65E+00     4.79E-02    0.06239 Eu-152    1.45E-02    2.36E+00     6.14E-03 C-14     1.32E-01    1.59E+01     8.30E-03 Co-60    1.40E-01    1.06E+00     1.32E-01 Cs-137    2.09E-01    3.65E+00     5.73E-02    0.27112 8109X-3-FR -GSSA-011     361.2   Eu-152    1.62E-01    2.36E+00     6.86E-02

C-14     2.09E-01    1.59E+01     1.31E-02

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Weight              Activity   Operational    Fraction Sample ID                     ROC      (pCi/g)      DCGL            of       OpSOF (g)                            (pCi/g)     OpDCGL

Co-60    0.00E+00      1.06E+00     0.00E+00 8109X-3-FR-GSSX-012       442.6    Cs-137    1.68E-01     3.65E+00     4.60E-02    0.04603 Eu-152   0.00E+00      2.36E+00     0.00E+00 C-14    0.00E+00      1.59E+01     0.00E+00 Co-60     5.32E-02     1.06E+00     5.02E-02 8109X-3-FR-GSSX-013       399.6    Cs-137    6.44E-03     3.65E+00     1.76E-03    0.05950 Eu-152   0.00E+00      2.36E+00     0.00E+00 C-14     1.20E-01     1.59E+01     7.55E-03 Co-60     1.02E-01     1.06E+00     9.62E-02 8109X-3-FR-GSSX-014       396.5    Cs-137    1.37E-01     3.65E+00     3.75E-02    0.13459 Eu-152   0.00E+00      2.36E+00     0.00E+00 C-14     1.32E-02     1.59E+01     8.30E-04 Note: Bold values indicate concentrations greater than MDC.

Table 7 Basic Statistical Properties of Random Sample Population and Survey Unit Dose ROC        Mean     Median      Max         Min    Std. Dev. BcDCGL     Avg BcSOF    Avg Dose (pCi/g)    (pCi/g)   (pCi/g)    (pCi/g)   (pCi/g)   (pCi/g)    per ROC     per ROC Co-60    6.08E-02   3.55E-02   2.13E-01  0.00E+00   7.36E-02 3.77E+00    1.61E-02    4.03E-01 Cs-137   1.01E-01   1.13E-01   2.37E-01  0.00E+00   8.93E-02 1.31E+01    7.72E-03    1.93E-01 Eu-152   3.01E-02   0.00E+00   1.94E-01  0.00E+00   6.45E-02 8.41E+00    3.58E-03    8.95E-02 C-14    1.64E-01   1.28E-01   4.84E-01  0.00E+00   1.48E-01 5.70E+01    2.88E-03    7.20E-02 Mean base case sum of fractions (BcSOF) =  0.0303

DOSE ASSIGNED TO SURVEY UNIT =  0.7576 mrem/yr

The on-site laboratory analyzed four judgmental soil samples using the on-site gamma spectroscopy system. An ISOCS system with a 1 m2 field of view was utilized for the other investigations. Thirty-four judgmental ISOCS measurements were collected for investigation.
Surface soil samples have GSS in the sample nomenclature, and ISOCS measurements have GGD in the sample nomenclature. A summary of the analytical results for the judgmental soil samples and ISOCS measurements is provided in Table 7-3. Gamma spectroscopy results revealed that Cs-137 was positively identified in six judgmental samples/measurements. No other ROCs were positively identified. GEL Laboratories analyzed the four judgmental samples for the HTD ROC C-14. C-14 was not detected in any of the four judgmental samples. The maximum OpSOF for judgmental samples/measurements is 0.8186. This location, as well as two other

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ISOCS measurement locations, were further investigated and physical samples were taken. The ISOCS locations 21, 32, and 40 were sampled; these were samples 50 through 52. The results of these samples are considered the representative concentrations for the representative ISOCS locations, with the resulting highest OpSOF of judgmental being 0.4195. It should be noted that the elevated OpSOFs for ISOCS locations 21, 32, and 40 were due, in most part, by the methodology of reporting ROCs below the respective MDA, particularly Eu-152. This methodology resulted in OpSOFs above 0.5, when only the ROC Cs-137 was detected in one measurement, at a concentration of 0.29 pCi/g.

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples/Measurements Weight             Measured     Operational    Fraction Sample ID                   ROC      Activity      DCGL           of      OpSOF (g)                (pCi/g)      (pCi/g)     OpDCGL

Co-60     9.16E-03     1.06E+00     8.64E-03 8109X-3-FJ-GSSX-015      422.8    Cs-137    6.47E-02     3.65E+00     1.77E-02   0.04789 Eu-152    1.62E-02     2.36E+00     6.86E-03 C-14     2.33E-01     1.59E+01     1.47E-02 Co-60     6.34E-02     1.06E+00     5.98E-02 8109X-3-FJ-GGDX-016       N/A     Cs-137    0.00E+00     3.65E+00     0.00E+00   0.23156 Eu-152    4.05E-01     2.36E+00     1.72E-01 C-14     0.00E+00     1.59E+01     0.00E+00 Co-60     1.39E-01     1.06E+00     1.31E-01 8109X-3-FJ-GGDX-017       N/A     Cs-137    0.00E+00     3.65E+00     0.00E+00   0.13082 Eu-152    0.00E+00     2.36E+00     0.00E+00 C-14     0.00E+00     1.59E+01     0.00E+00 Co-60     1.36E-01     1.06E+00     1.29E-01 8109X-3-FJ-GGDX-018       N/A     Cs-137    7.96E-02     3.65E+00     2.18E-02   0.19299 Eu-152    1.00E-01     2.36E+00     4.25E-02 C-14     0.00E+00     1.59E+01     0.00E+00 Co-60     0.00E+00     1.06E+00     0.00E+00 8109X-3-FJ-GGDX-019       N/A     Cs-137    0.00E+00     3.65E+00     0.00E+00   0.21431 Eu-152    5.06E-01     2.36E+00     2.14E-01 C-14     0.00E+00     1.59E+01     0.00E+00 Co-60     1.59E-01     1.06E+00     1.50E-01 8109X-3-FJ-GGDX-020       N/A     Cs-137    0.00E+00     3.65E+00     0.00E+00   0.15040 Eu-152    0.00E+00     2.36E+00     0.00E+00 C-14     0.00E+00     1.59E+01     0.00E+00

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Weight             Measured    Operational   Fraction Sample ID                   ROC      Activity     DCGL           of     OpSOF (g)               (pCi/g)      (pCi/g)     OpDCGL

Co-60    8.70E-02     1.06E+00     8.21E-02 8109X-3-FJ-GGDX-021              Cs-137   1.06E-01     3.65E+00     2.90E-02 N/A    Eu-152    1.67E+00     2.36E+00     7.08E-01  0.81860

C-14    0.00E+00     1.59E+01    0.00E+00 Co-60    1.22E-02     1.06E+00     1.15E-02 8109X-3-FJ-GGDX-022      N/A     Cs-137   0.00E+00     3.65E+00    0.00E+00   0.06463 Eu-152    1.25E-01     2.36E+00     5.31E-02 C-14    0.00E+00     1.59E+01    0.00E+00 Co-60    2.31E-01     1.06E+00     2.18E-01 8109X-3-FJ-GGDX-023      N/A     Cs-137   0.00E+00     3.65E+00    0.00E+00   0.21753 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14    0.00E+00     1.59E+01    0.00E+00 Co-60    7.28E-02     1.06E+00     6.87E-02 8109X-3-FJ-GGDX-024      N/A     Cs-137   7.35E-02     3.65E+00     2.01E-02  0.28659 Eu-152    4.67E-01     2.36E+00     1.98E-01 C-14    0.00E+00     1.59E+01    0.00E+00 Co-60    2.13E-01     1.06E+00     2.01E-01 8109X-3-FJ-GGDX-025              Cs-137   2.60E-01     3.65E+00     7.13E-02 N/A    Eu-152    2.72E-01     2.36E+00     1.15E-01  0.38749

C-14    0.00E+00     1.59E+01    0.00E+00 Co-60    1.12E-02     1.06E+00     1.05E-02 8109X-3-FJ-GGDX-026      N/A     Cs-137   3.56E-01     3.65E+00     9.74E-02  0.10795 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14    0.00E+00     1.59E+01    0.00E+00 Co-60    0.00E+00     1.06E+00    0.00E+00 8109X-3-FJ-GGDX-027      N/A     Cs-137   1.21E-01     3.65E+00     3.33E-02  0.26529 Eu-152    5.48E-01     2.36E+00     2.32E-01 C-14    0.00E+00     1.59E+01    0.00E+00 Co-60    1.14E-01     1.06E+00     1.07E-01 8109X-3-FJ-GGDX-028      N/A     Cs-137   1.56E-01     3.65E+00     4.28E-02  0.15022 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14    0.00E+00     1.59E+01    0.00E+00

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Weight             Measured    Operational   Fraction Sample ID                   ROC      Activity     DCGL           of     OpSOF (g)               (pCi/g)      (pCi/g)     OpDCGL

Co-60    6.19E-02     1.06E+00     5.84E-02 8109X-3-FJ-GGDX-029      N/A     Cs-137   1.63E-01     3.65E+00     4.47E-02  0.10310 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60    0.00E+00     1.06E+00    0.00E+00 8109X-3-FJ-GGDX-030      N/A     Cs-137   1.78E-01     3.65E+00     4.87E-02  0.04872 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60    1.28E-01     1.06E+00     1.21E-01 8109X-3-FJ-GGDX-031      N/A     Cs-137   1.93E-01     3.65E+00     5.30E-02  0.17364 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60    4.85E-02     1.06E+00     4.58E-02 8109X-3-FJ-GGDX-032              Cs-137   2.90E-01     3.65E+00     7.96E-02 N/A    Eu-152    1.09E+00     2.36E+00     4.62E-01  0.58730

C-14     0.00E+00     1.59E+01    0.00E+00 Co-60    1.02E-01     1.06E+00     9.60E-02 8109X-3-FJ-GGDX-033      N/A     Cs-137   1.45E-01     3.65E+00     3.97E-02  0.13573 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60    0.00E+00     1.06E+00    0.00E+00 8109X-3-FJ-GGDX-034      N/A     Cs-137   1.40E-01     3.65E+00     3.83E-02  0.41951 Eu-152    9.00E-01     2.36E+00     3.81E-01 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60    1.33E-02     1.06E+00     1.26E-02 8109X-3-FJ-GGDX-035              Cs-137   2.49E-01     3.65E+00     6.82E-02 N/A    Eu-152    3.50E-01     2.36E+00     1.48E-01  0.22890

C-14     0.00E+00     1.59E+01    0.00E+00 Co-60    1.35E-01     1.06E+00     1.28E-01 8109X-3-FJ-GGDX-036      N/A     Cs-137   6.93E-02     3.65E+00     1.90E-02  0.27978 Eu-152    3.14E-01     2.36E+00     1.33E-01 C-14     0.00E+00     1.59E+01    0.00E+00

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Weight             Measured    Operational   Fraction Sample ID                   ROC     Activity      DCGL           of     OpSOF (g)               (pCi/g)      (pCi/g)     OpDCGL

Co-60    1.05E-01     1.06E+00    9.94E-02 8109X-3-FJ-GGDX-037      N/A    Cs-137    9.02E-02     3.65E+00    2.47E-02   0.34198 Eu-152    5.14E-01     2.36E+00    2.18E-01 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60    4.20E-03     1.06E+00    3.96E-03 8109X-3-FJ-GGDX-038      N/A    Cs-137    1.52E-01     3.65E+00    4.17E-02   0.04570 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60    0.00E+00     1.06E+00    0.00E+00 8109X-3-FJ-GGDX-039      N/A    Cs-137    0.00E+00     3.65E+00    0.00E+00   0.00000 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60    3.80E-02     1.06E+00    3.59E-02 8109X-3-FJ-GGDX-040      N/A    Cs-137    0.00E+00     3.65E+00    0.00E+00   0.51081 Eu-152    1.12E+00     2.36E+00    4.75E-01 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60    1.13E-02     1.06E+00    1.07E-02 8109X-3-FJ-GGDX-041      N/A    Cs-137    4.72E-02     3.65E+00    1.29E-02   0.02362 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60    7.51E-02     1.06E+00    7.08E-02 8109X-3-FJ-GGDX-042      N/A    Cs-137    0.00E+00     3.65E+00    0.00E+00   0.07082 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60    5.26E-02     1.06E+00    4.96E-02 8109X-3-FJ-GGDX-043             Cs-137    6.69E-02     3.65E+00    1.83E-02 N/A    Eu-152    0.00E+00     2.36E+00    0.00E+00   0.06794

C-14     0.00E+00     1.59E+01    0.00E+00 Co-60    9.70E-02     1.06E+00    9.15E-02 8109X-3-FJ-GGDX-044             Cs-137    5.25E-01     3.65E+00    1.44E-01 N/A    Eu-152    1.48E-01     2.36E+00    6.25E-02   0.29798

C-14     0.00E+00     1.59E+01    0.00E+00

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Weight            Measured    Operational    Fraction Sample ID                   ROC      Activity      DCGL           of     OpSOF (g)               (pCi/g)      (pCi/g)     OpDCGL

Co-60     1.05E-01     1.06E+00    9.87E-02 8109X-3-FJ-GGDX-045      N/A     Cs-137    0.00E+00     3.65E+00    0.00E+00   0.26059 Eu-152    3.82E-01     2.36E+00    1.62E-01 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60     7.43E-02     1.06E+00    7.01E-02 8109X-3-FJ-GGDX-046      N/A     Cs-137    2.11E-01     3.65E+00    5.78E-02   0.12787 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60     3.38E-02     1.06E+00    3.19E-02 8109X-3-FJ-GGDX-047      N/A     Cs-137    4.12E-01     3.65E+00    1.13E-01   0.14772 Eu-152    6.91E-03     2.36E+00    2.93E-03 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60     1.08E-01     1.06E+00    1.02E-01 8109X-3-FJ-GGDX-048      N/A     Cs-137    0.00E+00     3.65E+00    0.00E+00   0.10214 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60     5.30E-02     1.06E+00    5.00E-02 8109X-3-FJ-GGDX-049      N/A     Cs-137    1.14E-01     3.65E+00    3.11E-02   0.08108 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60     3.81E-02     1.06E+00    3.59E-02 8109X-3-FJ-GSSX-050      440.7   Cs-137    1.08E-01     3.65E+00    2.96E-02   0.06553 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60     1.52E-02     1.06E+00    1.43E-02 8109X-3-FJ-GSSX-051      441.5   Cs-137    1.80E-01     3.65E+00    4.93E-02   0.11323 Eu-152    1.17E-01     2.36E+00    4.96E-02 C-14     0.00E+00     1.59E+01    0.00E+00 Co-60     5.71E-02     1.06E+00    5.39E-02 8109X-3-FJ-GSSX-052      435.8   Cs-137    1.92E-01     3.65E+00    5.26E-02   0.10647 Eu-152    0.00E+00     2.36E+00    0.00E+00 C-14     0.00E+00     1.59E+01    0.00E+00

Note: Bold values indicate concentrations greater than MDC.

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The implementation of survey specific QC measurements included the collection of five samples (8109X-3-FQ-GSSX-005, 8109X-3-FQ-GGDX-008, 8109X-3-FR-GSSB-011, 8109X-3-FQ-GGDX-031, 8109X-3-FQ-GGDX-034) for split or duplicate sample analysis. The on-site laboratory analyzed the QC samples using the on-site gamma spectroscopy system. A summary of the analytical results for the QC samples is provided in Table 7-5. Gamma spectroscopy results revealed that Cs-137 was not positively identified in any of the QC samples. No other ROC were positively identified in any QC sample. The maximum OpSOF for QC samples is 0.3501.

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples

Weight              Activity  OpDCGL       Fraction Sample ID                    ROC       (pCi/g)     (pCi/g)       of      OpSOF (g)                                     OpDCGL Co-60    2.18E-02    1.06E+00    0.02057 8109X-3-FQ-GSSX-005       443.9    Cs-137   0.00E+00    3.65E+00    0.00000    0.02057 Eu-152   0.00E+00    2.36E+00    0.00000 C-14    0.00E+00    1.59E+01    0.00000 Co-60    9.92E-02    1.06E+00    0.09363 8109X-3-FQ-GGDX-008        N/A     Cs-137   1.55E-01    3.65E+00    0.04241    0.17645 Eu-152   9.54E-02    2.36E+00    0.04041 C-14    0.00E+00    1.59E+01    0.00000 Co-60    1.16E-01    1.06E+00    0.10943 8109X-3-FR-GSSB-011      389.6    Cs-137   0.00E+00    3.65E+00    0.00000    0.10943 Eu-152   0.00E+00    2.36E+00    0.00000 C-14    0.00E+00    1.59E+01    0.00000 Co-60    1.78E-02    1.06E+00    0.01681 8109X-3-FQ-GGDX-031        N/A     Cs-137   2.83E-01    3.65E+00    0.07749    0.09431 Eu-152   0.00E+00    2.36E+00    0.00000 C-14    0.00E+00    1.59E+01    0.00000 Co-60    1.93E-01    1.06E+00    0.18172 8109X-3-FQ-GGDX-034        N/A     Cs-137   3.31E-01    3.65E+00    0.09081    0.35012 Eu-152   1.83E-01    2.36E+00    0.07759 C-14    0.00E+00    1.59E+01    0.00000 Note: Bold values indicate concentrations greater than MDC.
: 8. QUALITY CONTROL

The on-site laboratory processed five split and duplicate samples (8109X-3-FQ-GSSX-005, 8109X-3-FQ-GGDX-008, 8109X-3-FR-GSSB-011, 8109X-3-FQ-GGDX-031, 8109X-3-FQ-GGDX-034) using gamma spectroscopy analysis. The data was evaluated using the acceptance criteria specified in NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols

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Manual (Reference 13) as detailed in Section 5.6.3.2 of the LTP. There was acceptable agreement between standard and comparison sample results in all cases, as Cs-137 was not detected in either sample/measurement or was not detected in one sample but was detected in the other at levels below the 95% confidence level and was not required to be assessed. Refer to  for data and QC analysis results.
: 9. INVESTIGATIONS AND RESULTS

During the FSS of Survey Unit 8109 areas with a +3 sigma/alarms during scanning were investigated. Thirty-eight judgmental samples/measurements were collected for investigation, all with radiological concentrations below the OpDCGL.
: 10. REMEDIATION AND RESULTS

No radiological remedial action as described by MARSSIM Section 5.4 was performed in Survey Unit 8109 prior to or as a result of the FSS. Chapter 4 of the LTP determined that remediation beyond that required to meet the release criteria is unnecessary and the remaining residual radioactivity in soil was ALARA.
: 11. CHANGES FROM THE FINAL STATUS SURVEY PLAN

There were no addendums to the FSS plan.
: 12. DATA QUALITY ASSESSMENT

The DQO sample design and data were reviewed in accordance with FCSD-RA-LT-304, Final Status Survey Data Assessment (Reference 14) for completeness and consistency.
Documentation was complete and legible. Surveys and the collection of samples were consistent with the DQOs and were sufficient to ensure that the survey unit was properly designated as Class
: 3. The survey design had adequate power as indicated by the retrospective power curve (see , Figure 16-5).
The measurement results indicated that all samples were less than a SOF of 1 when compared to the OpDCGLs.
Although MARSSIM states that the Sign Test need not be performed in the instance that no measurements surpass the OpDCGL, the test was conducted to demonstrate adherence to the statistical principles of the DQO process. The Sign Test was performed on the data and compared to the original assumptions of the DQOs. The evaluation of the Sign Test results clearly demonstrates that Survey Unit 8109 passes the unrestricted release criteria, thus, the null hypothesis is rejected. The results of the Sign Test are presented in Attachment 3.

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The preliminary data review consisted of calculating basic statistical quantities (e.g., mean, median, standard deviation). All data was considered valid including negative values, zeros, and values reported below the MDC. The mean and median values for each ROC were well below the respective OpDCGLs. Also, the retrospective power curve shows that enough samples were collected to achieve the desired power; therefore, Survey Unit 8109 meets the unrestricted release criteria with adequate power as required by the DQOs.
The mean of all identified isotopes is less than the Consultation Triggers for Residential Soil Concentration depicted in Table H.1 of NUREG 1757, Vol.1, Rev. 2 (Memorandum of Understanding Table 1). The full table is included in Attachment 5 of this release record.
The data for Cs-137 is presented graphically through frequency and quantile plots. All graphical presentations are provided in Attachment 6.
: 13. ANOMALIES

No anomalies were observed during the performance or analyses of the survey.
: 14. CONCLUSION

Survey Unit 8109 has met the DQOs of the FSS plan. The ALARA criteria as specified in Chapter 4 of the LTP were achieved. The elevated measurement comparison for soils was not applicable and remediation was not required.
All identified ROCs were used for statistical testing to determine the adequacy of the Survey Unit 8109 for FSS. Evaluation of the data shows that none of the random ROC concentration values exceeds the OpDCGLs; therefore, in accordance with LTP Section 5.2.6, the survey unit meets the release criteria.
The sample data passed the Sign Test. The null hypothesis was rejected. The retrospective power curve showed that adequate power was achieved. Survey Unit 8109 is properly classified as Class 3.
The dose contribution from soil in Survey Unit 8109 is 0.7576 mrem/year TEDE, based on the average concentration of the ROCs in samples used for nonparametric statistical testing.
Survey Unit 8109 is acceptable for unrestricted release.

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: 15. REFERENCES
: 1. FCSD-RA-LT-305, Final Status Survey Data Reporting
: 2. Fort Calhoun Station Decommissioning Project License Termination Plan
: 3. FCSD-RA-LT-302, Final Status Survey Sample Plan Development
: 4. NUREG-1575, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual
: 5. TSD 20-001, Historical Site Assessment for Fort Calhoun Station
: 6. TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan
: 7. NUREG-1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance -
Characterization, Survey, and Determination of Radiological Criteria - Draft Report for Comment
: 8. FCSD-RA-LT-100, Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station
: 9. FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors
: 10. FCSD-RA-LT-205, Chain-of-Custody Protocol for Site Characterization and Final Status Survey
: 11. FCSD-RA-LT-203, Sample Media Collection for Site Characterization and Final Status Survey
: 12. FCSD-RA-LT-204, Sample Media Preparation for Site Characterization and Final Status Survey
: 13. NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual
: 14. FCSD-RA-LT-304, Final Status Survey Data Assessment

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: 16. ATTACHMENTS

Attachment 1 - Random and Judgmental Sample Collection Locations Maps Attachment 2 - Complete Scan Data Attachment 3 - Soil Samples Sign Test Attachment 4 - Quality Control Assessment Attachment 5 - Consultation Triggers for Residential Soil Concentrations Attachment 6 - Graphical Presentations

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ATTACHMENT 1 - RANDOM AND JUDGMENTAL SAMPLE COLLECTION LOCATIONS MAPS

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Figure 16 Survey Unit 8109 Random Samples Location & Scan Areas33

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34

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ATTACHMENT 2 - COMPLETE SCAN DATA

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Table 16 Survey Unit 8109 Complete Scan Data Min Scan   Max Scan    Avg    Action   Scan Detector Detector ID  M3001 ID    Survey   Locat-    Logged     Logged    Back-    Level  Alarm?
Type                              Unit     ion      Result     Result   ground   (cpm)    (Y/N)
(cpm)      (cpm)     (cpm) 44-20    PR404738    25021210    8109       1       19953      30706     28040   29501     Y

44-20    PR403795    25021219    8109       2       19590      31009     27700   29153     Y

44-20    PR404738    25021210    8109       3       16733      31462     28060   29522     Y

44-20    PR403795    25021219    8109       4       15417      31918     28740   30220     Y

44-20    PR403795    25021219    8109       5       18004      31615     28120   29584     Y

44-20    PR404738    25021210    8109       6       15030      31770     28500   29973     Y

44-20   PR4043795    25021219    8109       7       20689      31172     28080   29543     Y

44-20   PR404738     25021210    8109       8       22060      30409     27980   29440     Y

44-20    PR403795    25021219    8109       9       16007      31024     28240   29707     Y

44-20    PR403795    25021219    8109       10      21225      31486     28480   29953     Y

44-20    PR403795    25021219    8109       11      14964      31323     27960   29419     Y

44-20    PR404738    25021210    8109       12      17425      31835     28340   29809     N

44-20    PR404738    25021210    8109       13      23680      31720     28920   30404     Y

44-20    PR404738    25021210    8109       14      17230      31480     28220   29686     Y

44-20   PR4034738    25021210    8109       15      20736      29663     27400   28845     Y

44-20    PR404738    25021210    8109     QC 5      26074      31577     28740   30220     Y

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ATTACHMENT 3 - SOIL SAMPLES SIGN TEST

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Table 16 Survey Unit 8109 Sign Test
                           #          SOF         1-Ws         Sign (Ws) 1        0.14031        0.86         +1 2        0.26141        0.74         +1 3        0.08733        0.91         +1 4        0.08770        0.91         +1 5        0.03034        0.97         +1 6        0.01711        0.98         +1 7        0.00811        0.99         +1 8        0.23519        0.76         +1 9        0.07283        0.93         +1 10        0.06239        0.94         +1 11        0.27112        0.73         +1 12        0.04603        0.95         +1 13        0.05950        0.94         +1 14        0.13459        0.87         +1

Number of positive differences (S+)      14

Critical Value     10

Survey Unit           Meets the Acceptance Criteria

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ATTACHMENT 4 - QUALITY CONTROL ASSESSMENT

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Table 16 Survey Unit 8109 QC Assessment

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ATTACHMENT 5 - CONSULTATION TRIGGERS FOR RESIDENTIAL SOIL CONCENTRATION

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ATTACHMENT 6 - GRAPHICAL PRESENTATIONS

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35 - Quantile Plot for Cs-137 Concentration

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36 - Histogram for Cs-137 Concentration

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37 - Retrospective Power Curve for Survey Unit 8109

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FORT CALHOUN STATION FINAL STATUS SURVEY RELEASE RECORD

SURVEY UNIT 8110 NORTH OWNER CONTROLLED AREA

REVISION 0

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH OWNER CONTROLLED AREA

PREPARED BY / DATE:
M. Uz, LT/FSS Specialist

REVIEWED      BY / DATE:
L. Coffey, LT/FSS Specialist

REVIEWED      BY / DATE:
A. Barker Regulatory Assurance & Emergency Planning Manager

REVIEWED      BY / DATE:
D. Whisler Manager Radiation Protection & Chemistry

APPROVED BY / DATE:
B. Bishop, LT/FSS Manager

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

TABLE OF CONTENTS
: 1.                                              EXECUTIVE 

==SUMMARY==
...................................................................................................................8
: 2.                                              SURVEY UNIT DESCRIPTION ........................................................................................................8
: 3.                                              CLASSIFICATION BASIS ..................................................................................................................8
: 4.                                             DATA QUALITY OBJECTIVES .....................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  11
: 5.                                              SURVEY DESIGN ..............................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      14
: 6.                                              SURVEY IMPLEMENTATION .......................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        18
: 7.                                              SURVEY RESULTS ...........................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     19
: 8.                                             QUALITY CONTROL .......................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         59
: 9.                                              INVESTIGATIONS AND RESULTS ...............................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                59
: 10.                       REMEDIATION AND RESULTS ....................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       60
: 11.                        CHANGES FROM THE FINAL STATUS SURVEY PLAN .........................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            60
: 12.                       DATA QUALITY ASSESSMENT ....................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       60
: 13.                        ANOMALIES ......................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              61
: 14.                        CONCLUSION ...................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             61
: 15.                        REFERENCES ....................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        61
: 16.                        ATTACHMENTS ...............................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 62

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LIST OF TABLES

Table 3-1               - Statistical Quantities for Cs-137 and Co-60 from the Characterization Survey of 8110                                                       ...9 Table 3-2               - Off-Site Analysis for Characterization Samples in 8110              .......................................................9 Table 4-1               - Base Case DCGLs for Soil ......................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             13 Table 4-2               - Operational DCGLs for Soil ..................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 13 Table 5-1               - Action Levels for Survey Unit 8110 .......................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       14 Table 5-2               - Random Sample Locations                                .....................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  15 Table 5-3               - Judgmental Sample Locations                                     ...............................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                16 Table 5-4               - Investigation Levels ................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           17 Table 5-5               - Synopsis of Survey  Design ......................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             18 Table 7-1               - Synopsis of Scan Results .........................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              20 Table 7-2               - Summary of Gamma Spectroscopy Results and OpSOF Calculations for Samples Comprising the Statistical Sample Population .................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     51 Table 7-3               - Basic Statistical Properties of Random Sample Population and Survey Unit Dose  ..........                                                                                                     53 Table 7-4               - Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples ................................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             54 Table 7-5               - Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples  ..             58 Table 16-1               - Survey Unit 8110 Complete Scan Data ...............................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               66 Table 16-2               - Survey Unit 8110  Sign Test .................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          69 Table 16-3               - Survey Unit 8110 QC Assessment........................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  71

LIST OF FIGURES

Figure 7-1               - Survey Unit 8110 Grid #1 GPS Scan Results  ......................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            21 Figure 7-2               - Survey Unit 8110 Grid #1 Z-Score and Sample Locations Map                .......................................                                                                                                                                                                                                                                                                                                                                                                                                                                      22 Figure 7-3               - Survey Unit 8110 Grid #2 GPS Scan Results  ......................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            23 Figure 7-4               - Survey Unit 8110 Grid #2 Z-Score Map               ..............................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    24 Figure 7-5               - Survey Unit 8110 Grid #3 GPS Scan Results  ......................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            25 Figure 7-6               - Survey Unit 8110 Grid #3 Z-Score Map               ..............................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    26 Figure 7-7               - Survey Unit 8110 Grid #4 GPS Scan Results  ......................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            27 Figure 7-8               - Survey Unit 8110 Grid #4 Z-Score Map               ..............................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    28 Figure 7-9               - Survey Unit 8110 Grid #5 GPS Scan Results  ......................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            29 Figure 7-10               - Survey Unit 8110 Grid #5 Z -Score and Sample Locations Map                                    .....................................                                                                                                                                                                                                                                                                                                                                                                                                               30 Figure 7-11               - Survey Unit 8110 Grid #6 GPS Scan Results  ....................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      31 Figure 7-12               - Survey Unit 8110 Grid #6 Z -Score and Sample Locations Map                                    .....................................                                                                                                                                                                                                                                                                                                                                                                                                               32 Figure 7-13               - Survey Unit 8110 Grid #7 GPS Scan Results  ....................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      33 Figure 7-14               - Survey Unit 8110 Grid #7 Z -Score Map               ............................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              34 Figure 7-15               - Survey Unit 8110 Grid #8 GPS Scan Results  ....................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      35 Figure 7-16               - Survey Unit 8110 Grid #8 Z -Score and Sample Locations Map                                    .....................................                                                                                                                                                                                                                                                                                                                                                                                                               36 Figure 7-17               - Survey Unit 8110 Grid #9 GPS Scan Results  ....................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      37

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Figure 7-18               - Survey Unit 8110 Grid #9 Z -Score and Sample Locations Map                                    .....................................                                                                                                                                                                                                                                                                                                                                                                                                               38 Figure 7-19               - Survey Unit 8110 Grid #10 GPS Scan Results  ..................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                39 Figure 7-20               - Survey Unit 8110 Grid #10 Z -Score and Sample Locations Map                                    ...................................                                                                                                                                                                                                                                                                                                                                                                                         40 Figure 7-21               - Survey Unit 8110 Grid #11 GPS Scan Results  ..................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                41 Figure 7-22               - Survey Unit 8110 Grid #11 Z -Score and Sample Locations Map                                    ...................................                                                                                                                                                                                                                                                                                                                                                                                         42 Figure 7-23               - Survey Unit 8110 Grid #12 GPS Scan Results  ..................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                43 Figure 7-24               - Survey Unit 8110 Grid #12 Z -Score and Sample Locations Map                                    ...................................                                                                                                                                                                                                                                                                                                                                                                                         44 Figure 7-25               - Survey Unit 8110 Grid #13 GPS Scan Results  ..................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                45 Figure 7-26               - Survey Unit 8110 Grid #13 Z -Score Map               ..........................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        46 Figure 7-27               - Survey Unit 8110 Grid #14 GPS Scan Results  ..................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                47 Figure 7-28               - Survey Unit 8110 Grid #14 Z -Score and Sample Locations Map                                    ...................................                                                                                                                                                                                                                                                                                                                                                                                         48 Figure 7-29               - Survey Unit 8110 Grid #10 QC GPS Scan Results  ...........................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  49 Figure 7-30               - Survey Unit 8110 Grid #10 QC Z -Score                                              ............................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              50 Figure 16-1               - Survey Unit 8110 Scan Locations Map  ..............................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    64 Figure 16-2               - Quantile Plot for Cs-137 Concentration                ............................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              75 Figure 16-3               - Histogram for Cs-137 Concentration                                                                ................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          76 Figure 16-4               - Retrospective Power Curve for Survey Unit 8110 ............................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             77

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

LIST OF ABBREVIATIONS delta
/                                                                                                                                                                                                     relative shift sigma ALARA                                                                                                               as low as is reasonably achievable BcDCGL                                                                                            base case derived concentration guideline level BcSOF                                                                                                                                      base case sum of fractions cpm                                                                                                                                                                                         counts per minute DQA                                                                                                                                                                    data quality assessment DQO                                                                                                                                                                    data quality objective DCGL                                                                                                                                       derive                        d concentration guideline level DCGLW                                                                                                                    derived concentration guideline level wide area FSS                                                                                                                                                                                         final status survey GPS                                                                                                                                                                                 Global Positioning System HTD                                                                                                                                                                       hard-to-detect IC                                                                                                                                                                                                                          insignificant contributor LBGR                                                                                                                                          lower bound of the gray region LTP                                                                                                                                                                                    license termination plan m                                                                                                                                                                                                                                    meter MARSSIM                                                       Multi-Agency Radiation Survey and Site Investigation Manual MDC                                                                                                                                                            minimum detectable concentration mrem/yr                                                                                                               millirem per year NaI                                                                                                                                                                                                  sodium iodide NRC                                                                                                                                                                       Nuclear Regulatory Commission OpDCGL                                                                                       derived concentration guideline level QAPP                                                                                                                                               quality assurance project plan QC                                                                                                                                                                                                       quality control

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

ROC                                                                                                                                                                       radionuclides of                                     concern SOF                                                                                                                                                                                 sum of fractions TEDE                                                                                                                                               total effective dose equivalent TSD                                                                                                                                                                               technical support document UBGR                                                                                                                                      upper bound of the gray region VSP                                                                                                                                                                                 Visual Sample Plan

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA
: 1.                                                                                       EXECUTIVE 

==SUMMARY==

This final status survey (F                                   SS) release record for Survey Unit 8110 , North                                                                                                             Owner Controlled Area, has been generated                         in accordance with             procedure FCSD           -RA-                                                                  LT-305,                                                           Final Status Survey Data Reporting (Reference             1) and satisfies the requirements of                                      Section 5.7.1 of the Fort Calhoun Station Decommissioning Project License Termination Plan  (FCS           ; LTP;                                                                                                  Reference 2).
An FSS sample plan for this survey unit was developed in accordance with procedure FCSD-RA-LT-302,                                                           Final Status Survey Sample Plan                                     Development (Reference 3), the FCS                                    LTP, and with guidance from NUREG-1575, Revision 1,                                               Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM; Reference 4).
Survey Unit 8110, an open land survey unit, has a MARSSIM classification of                                                                                                                          3. A                                                              survey plan was designed based upon use of the Sign Test as the nonparametric statistical test for compliance             .
Both the Type I (           ) and Type II () decision error rates were set at 0.05. As a random sample population, 14 soil samples were acquired from the survey unit. In addition, soil scanning was performed on 10% of the total surface area in the survey unit. T                           he analytical results for all  soil samples, both random and judgmental, taken in Survey Unit 8110  indicate that the                                                                                                                                                                                                      maximum sum of fractions (SOF           ), considering the concentration of all applicable radionuclides of            concern (ROCs), is                                                                                                                           equal to 0.2759 when applying the respective operational derived                                     concentration guideline levels (OpDCGLs) for soil. Therefore, the null hypothesis is rejected and Survey Unit 8110 is acceptable for unrestricted release.                                                                                                             The mean SOF when applying the respective             base                         case derived concentration guideline levels (                  BcDCGL) for soil                                       is 0.0218. This SOF equates to a dose for the survey unit of 0.5449 milliremper year (mrem/yr).
: 2.                                                                                       SURVEY UNIT DESCRIPTION

Survey Unit 8110is an impacted Class                                                                                                                                                                       3 open land survey unit. The                         surfacearea of the survey unit is 105,611 meters (m)2.
The boundary of the survey unit and the location of the soil samples were defined using a Global Positioning System (GPS). Refer to                                           Attachment 1 of this report for              a figure depicting Survey Unit 8110.
: 3.                                                                                       CLASSIFICATION BASIS

Survey Unit 8110was identified in                                                                                                              the technical support document (TSD) 20-001, Historical Site Assessment for Fort Calhoun Station  (Reference5                                                      ) as a Class             3 survey unit. The initial site characterization surveys were conducted between November 2019 and July 2020. The                                                                                                                                    following summarizes the results of the characterization survey for Survey Unit 8110.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

In total, seven                         surface soil sample            s were collected in Survey Unit 8110. All samples                                                                                                                                     from Survey Unit 8110 were analyzed by the on-site gamma spectroscopy system. Cs            -137 wasdetected at concentrations above minimum detectable concentration (MDC)                                                            in one                                                                                     of the samples at a maximum concentration of 8.57E-02 picocuries             per gram (pCi/g                ). Co                        -60 was not detected at concentrations above MDC in any of the surface soil samples                                     . A summary of the analyses for surface soil samples taken during site characterization are presented in  Table 3-1.
Eight surface soil             samples             from survey area 8100 were sent to              GEL Laboratories for off-                                            site analysis of the initial                         suite of radionuclides. A summary of the off-                                site analysesof                                                                       Survey Area 8100 is presented in Table                                     3-2.

Table 3 Statistical Quantities for Cs                                                                         -137 and Co-60 from the Characterization Survey of 8110 Surface Soil                           Co-60             Cs-137
                                                              # of Samples                                                                                                                                                                                                                                                                                                                            7
                                                                 # >MDC                                                                                                                                                                                                                                                          0                                                                                                                                                                         1 Mean (pCi/g)                        1.87E-02            5.64E-02 Median (pCi/g)                                                                                                                                      1.62E-02                                         5.98E-02 Max (pCi/g)                                                                                                                                                              2.70E-02                                         8.57E-02 Min (pCi/g)                        1.16E-02            1.92E-02 Standard Deviation (pCi/g)                                        6.14E-03                                         2.37E-02

Table 3 Off                                                                       -Site Analysis for Characterization Samples in            8100 Radionuclides                          8100X-3-CJ-                           8100X-3-CJ-                           8100X-3-CJ-                          8100X-3-CR-GSSX-044                              GSSX-058                              GSSX-064                              GSSX-003 Am-241                                7.07E-02                              2.72E-02                              4.72E-02                             0.00E+00 Sb-125                               4.66E-02                              2.70E-02                              6.77E-02                             0.00E+00 C-14                              0.00E+00                               1.37E-01                              1.07E-01                             0.00E+00 Ce-144                               1.02E-01                             0.00E+00                              0.00E+00                               7.80E-02 Cs-134                               8.37E-02                              1.87E-02                              5.11E-02                              4.36E-02 Cs-137                               1.72E-01                              1.80E-01                             1.24E-01                              1.29E-01 Co-57                               4.55E-03                             0.00E+00                               6.78E-03                             0.00E+00 Co-58                              0.00E+00                               1.75E-02                             0.00E+00                               4.06E-02 Co-60                              0.00E+00                              0.00E+00                              0.00E+00                               5.21E-03 Cm-242                               0.00E+00                              0.00E+00                               2.57E-02                             0.00E+00 Cm-243/244                              0.00E+00                               3.58E-02                              9.67E-02                              8.71E-03 Eu-152                               6.02E-03                              1.11E-03                              8.78E-02                             0.00E+00 Eu-154                              0.00E+00                               5.66E-03                              1.29E-01                             0.00E+00 Eu-155                               7.90E-02                              1.90E-02                              1.79E-02                              6.16E-02 Fe-55                              2.18E+00                              2.45E+00                              4.43E+00                              3.18E+00

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

Radionuclides       8100X-3-CJ-         8100X-3-CJ-         8100X-3-CJ-        8100X-3-CR-GSSX-044            GSSX-058            GSSX-064           GSSX-003 Mn-54              7.75E-03           0.00E+00            1.94E-02            3.03E-02 Np-237             0.00E+00           0.00E+00            8.29E-04            1.12E-03 Ni-59             0.00E+00           0.00E+00            0.00E+00            1.39E-01 Ni-63             0.00E+00           0.00E+00            5.00E-01            4.13E-01 Nb-94             5.79E-02            3.37E-03           3.50E-02            8.78E-03 Pu-238             0.00E+00            2.85E-03           1.50E-02            4.90E-03 Pu-239/240           7.86E-03            1.35E-02           1.73E-02            0.00E+00 Pu-241             1.26E+00           1.36E+00            2.17E+00            0.00E+00 Ag-110m             2.08E-02           0.00E+00            7.33E-02            0.00E+00 Sr-90             1.33E-01            1.09E-01           1.33E-01            1.44E-01 Tc-99             0.00E+00           0.00E+00            0.00E+00            0.00E+00 H-3              0.00E+00           0.00E+00            0.00E+00            0.00E+00 Zn-65             7.12E-02            2.89E-03           8.45E-03            4.71E-03

Radionuclides                8100X-3-CR-8100X-3-CR-        8100X-3-CR-          8100X-3-CR-GSSX-021             GSSX-027            GSSX-029             GSSX-038 Am-241           1.20E-02            1.26E-02             0.00E+00            0.00E+00 Sb-125           1.16E-01            2.24E-02             1.74E-03             1.22E-01 C-14            0.00E+00            4.79E-01             0.00E+00             2.73E-01 Ce-144           2.28E-01            7.07E-02             0.00E+00             2.41E-01 Cs-134           0.00E+00            4.96E-02             9.19E-02            0.00E+00 Cs-137           2.05E-01            3.08E-01             4.96E-01             1.41E-01 Co-57           2.37E-03            0.00E+00             5.95E-02             8.79E-03 Co-58           6.82E-02            0.00E+00             6.93E-02             4.28E-02 Co-60           2.29E-02            2.98E-02             0.00E+00            0.00E+00 Cm-242           0.00E+00            0.00E+00             0.00E+00            0.00E+00 Cm-243/244         2.23E-02            2.50E-02             1.20E-02             7.52E-03 Eu-152           0.00E+00            0.00E+00             2.82E-01             2.67E-02 Eu-154           3.91E-02            7.78E-02             7.35E-03            0.00E+00 Eu-155           4.19E-02            5.79E-02             6.79E-02            0.00E+00 Fe-55           1.88E+00            0.00E+00             2.30E+00            4.32E+00 Mn-54            3.95E-03            4.56E-02             0.00E+00             4.32E-03 Np-237           1.39E-03            1.89E-03             0.00E+00            0.00E+00 Ni-59           7.57E-01            7.73E-01             0.00E+00            1.17E+00 Ni-63           3.50E-01            0.00E+00             4.64E-01             4.66E-01 Nb-94           1.54E-02            0.00E+00             1.79E-01            0.00E+00 Pu-238           0.00E+00            5.67E-03             1.90E-02             4.82E-03 Pu-239/240         2.29E-02            1.16E-02             9.91E-03             1.06E-02

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

Radionuclides           8100X-3-CR-                8100X-3-CR-                8100X-3-CR-                 8100X-3-CR-GSSX-021                   GSSX-027                   GSSX-029                   GSSX-038 Pu-241                0.00E+00                    8.17E-01                   1.76E+00                   1.70E+00 Ag-110m                0.00E+00                   0.00E+00                    0.00E+00                   6.39E-02 Sr-90                 5.79E-02                  0.00E+00                    3.00E-02                   0.00E+00 Tc-99                0.00E+00                   0.00E+00                    0.00E+00                   6.42E-03 H-3                 0.00E+00                   0.00E+00                    0.00E+00                   0.00E+00 Zn-65                0.00E+00                   0.00E+00                    0.00E+00                   0.00E+00 Note: Bold values indicate concentration greater than MDC. Unbolded values indicate the value                                                                                                            below MDC. All values in pCi/g.

Based upon a review of the historical information, the results of the              characterization survey data, and completion of a Survey Unit Classification Worksheet, the correct final classification of Survey Unit 8110was determined to be Class                                                                                                               3.
: 4.                                                                                      DATA QUALITY OBJECTIVES

FSS planning and design rely                                                                                             on a properly executed                                                                         data                                     quality                         objective (DQO) process to ensure, through compliance with explicitly defined inputs and boundaries, that the primary objective of the survey is satisfied. The DQO process, utilized in accordance with MARSSIM, is described in the  FCS LTP. The appropriate design for a given survey was                                                                                                                                      developed using the DQO process as outlined in Appendix D of MARSSIM                                   . A summary of                         the seven steps of the DQO process are outlined in the following paragraphs.
The DQO process incorporates hypothesis testing and probabilistic sampling distributions to control decision errors during data analysis. Hypothesis testing is a process based on the scientific method that compares a baseline condition to an alternate condition. The baseline condition is technically known as the null hypothesis. Hypothesis testing rests on the premise that the null hypothesis is true and sufficient evidence must be provided to reject it in favor of the alternative hypothesis. In designing the survey plan, the underlying assumption, or null hypothesis was that residual activity in the survey unit exceeded the release criteria  . Rejection of the null hypothesis would indicate that residual activity within the survey unit does not exceed the release criteria   .
Therefore, the survey unit would satisfy the primary objective of the FSS sample             plan.
The primary objective of the FSS sample plan is to demonstrate that the level of residual radioactivity in Survey Unit 8110 did not exceed the release criteria specified in the LTP and that the potential dose from residual radioactivity is   as low as is reasonably achievable (ALARA).
TSD 21-043,Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan (Reference             6) establishe                                    s the basis for an initial suite of potential ROC s for decommissioning. LTP Chapter 2 provides detailed characterization data that describes the results of surveys completed of soil. Surface                                     samples were taken in each impacted open land survey unit

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

and analyzed for the presence of plant-derived radionuclides. The results of surface soil characterization in the impacted area surrounding FCS indicate that there is minimal residual radioactivity in soil.
IC were determined consistent with the guidance contained in              Section 3.3 of NUREG            -1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance - Characterization                                                                                                            , Survey, and Determination of Radiological Criteria                                                              (Reference             7). For soil, the ROCs were found to be Cs-137, Co-60, Eu-152, and C-14. The remaining radionuclides were designated as IC and were eliminated from further detailed evaluation.
Section 5.2.6 of the LTP states that each radionuclide specific B            cDCGL is equivalent to the level of residual radioactivity (above background levels) that could, when considered independently, result in a total effective dose equivalent (TEDE) of 25 mrem/yr to an Average Member of the Critical Group. To ensure that the summation of dose from each source term is 25 mrem/yr or less after all FSS is completed, the  BcDCGLs are reduced based on an expected, or  a priori, fraction of the 25 mrem/yr dose limit from each source term. The reduced DCGLs (i.e., OpDCGLs                                                       ) can be related to the BcDCGLs as an expected fraction of dose based on an a priori                                     assessment of what the expected dose should be based on the results of site characterization, process knowledge, and the extent of planned remediation. The OpDCGL is then used as the DCGL for the FSS design of the survey unit (e.g., calculation of surrogate DCGLs or, investigation levels). Details of the OpDCGLs derived for each dose component and the basis for the applied a priori dose fractions are provided in Section 5.2.6 of the LTP.
Multiple ROCs are known to be present at FCS           . The dose contribution from each ROC is accounted for using the SOF to ensure that the total dose from all ROC does not exceed the dose criterion. A BcDCGL that is established for the average residual radioactivity in a survey unit is equivalent to a derived concentration guideline level wide area (            DCGLW) as defined in MARSSIM.
At FCS, compliance is demonstrated through the summation of dose from seven distinct source terms (i.e., basements, soils, buried pipe,                                     embedded pipe, above-ground structures, basement fill, and groundwater) for the end state. When applied to soil, the DCGLs are expressed in units of activity per unit of mass (pCi/g).
For FCS, soil is             defined as a layer of soil beginning at the surface but extending to a depth of 1 m to allow for flexibility in compliance demonstration if contamination deeper than 0.15 m is encountered. Based on characterization data and historical information, there are no expectations of encountering a source term geometry that is comprised of a clean surface layer of soil over a contaminated subsurface soil layer. Section 6.9 of the LTP provides the exposure scenarios and modeling parameters that were  used to calculate the site-                                   specific soil DCGLs. The adjusted soil DCGLs for the unrestricted release of open land survey units as provided in the Section 6.16 of

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

the LTPare                                                                                                  pre                        sented in Table 4-1. The IC dose percentage of                                                 5% was used to adjust the DCGLs in Table                                     4-1 to account for the dose from the eliminated IC radionuclides.

Table 4 Base Case DCGLs                                                                        for Soil Surface Soil                               Subsurface Radionuclide                                   BcDCGL                               Soil BcDCGL (pCi/g)                                    (pCi/g)
C-14                                                                                                                                                                                      5.70E+01                                                                                                                                                    9.68E+00 Co-60                                3.77E+00                                   2.93E+00 Cs-137                                                                                                                                                1.31E+01                                                                                                                                                 7.27E+00 Eu-152                                                                                                                                               8.41E+00                                                                                                                                                    7.36E+00

The reduced DCGLs, OpDCGLs, are calculated using                         Equation 5-1 from Chapter 5 of the LTP, shown below.

Equation 4 OpDCGL Calculation

The OpDCGLs for the unrestricted release of               soil are provided in Table                                    4-2.

Table 4 Operational DCGLs                                                                         for Soil Surface Soil                                Subsurface Radionuclide                                   OpDCGL                               Soil OpDCGL (pCi/g)                                    (pCi/g)
C-14                                                                                                                                                                                      1.59E+01                                                                                                                                                       2.71E+00 Co-60                                                                                                                                         1.06E-00                                                                                                                         8.21E-01 Cs-137                                                                                                                                                3.65E+00                                                                                                                                                            2.04E-00 Eu-152                                                                                                                                               2.36E+00                                                                                                                                                            2.06E-00

Instrument DQOs included a verification of the ability of the survey instrument to detect the radiations of interest relative to the OpDCGL . Survey instrument response checks were required

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

prior to issuance and after the instrument had been used. Control and accountability of survey instruments was required to assure the quality and prevent the loss of data.
As part of the DQOs applied to laboratory processes, analysis results were reported as actual calculated results. The actual                                            reported value was used as the recorded FSS result for measurement and sample values that are less than MDC. Negative values were recorded as zero                        . Results were not reported as less than MDC. Sample            report summaries included unique sample identification, analytical method, radionuclide, result, uncertainty, laboratory data qualifiers, units, and the observed MDC.
In accordance with the LTP, for laboratory analysis, MDCs less than 10 % of the OpDCGL were preferable while MDCs up to 50% of the OpDCGL were            acceptable. The minimum acceptable MDC for measurements obtained using field instruments was 50% of the applicable OpDCGL.
: 5.                                                                                      SURVEY DESIGN

The level of effort associated with planning a survey is based on the complexity of the survey and nature of the hazards. Guidance for preparing FSS plans is provided in procedure                                     FCSD-RA-                                                                  LT-302, Final Status Survey Sample Plan                                     Development. (Reference3                                                      ).
The DQO process validated that Co                                    -60, Cs                                                                        -137, Eu                                                                       -152, and C-14 would be the ROCs in Survey Unit 8110 as presented in LTP Section                                                                                                                         5.2.5. As discussed in LTP  Section                                                                                                                         5.2.6.2, instead of inferring the  concentrations for the hard           -to-detect (HTD) ROC                                               C-14 using a surrogate approach, 100% of all samples collected in the survey unit were sent for off             -site analysis for C-14. The action levels for  Survey Unit 8110sample results are based on 50                                                                                                                        % of the Table 4-2OpDCGLs and are presented in Table 5-1.

Table 5 Action Levels for                                                                         Survey Unit 8110 ROC                          Action Level (pCi/g)
Co-60                                                                                                                                                                                                                                                    5.30E-01 Cs-137                                                                                                                                                                                                                                                            1.83E+00 Eu-152                                                                                                                                                                                                                                                           1.18E+00 C-14                                                                                                                                                                                                                                                                                                  7.95E+00

The Sign Test was selected as the nonparametric statistical test  to demonstrate compliance             with the release criteria. The use of the Sign Test did not require the selection or use of a background reference area, which simplified survey design and implementation. This approach was conservative since it included background Cs-137 as part of the sample set.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

The number of soil samples for FSS was determined in accordance with procedureFCSD                                  -RA-LT-302 (Reference                                                                                                                                               3). The relative shift (/) for the survey unit data set is defined as shift (),
which is the upper boundary of the                                     gray                        region (UBGR), or the DCGL (SOF of 1), minus the lower bound of the gray region (LBGR)                                                                        , divided by sigma (), which is the standard deviation of the data set used for survey design. The optimal value for / should range between 1 and 3. The largest value the / can have is 3. If the                                     calculated value of / exceeds 3, an adjusted value of 3 will be used for /. The / for                         Survey Unit 8110, based                                                                         on the data for surface soil samples collected during the                                                             characterization             of Survey Unit                                     8110, was calculated as follows:

Equation 5 Relative Shift
                                                              =                (1                 0.0716           )=               25.8 0.035955

As the calculated relative shift was greater than  3, a value of 3 was used as the adjusted /. Both the Type I error (i.e.,  value                                        ) and the Type II error (i.e.,  value) were                                         set at 0.05. The sample size from Table 5.5 of MARSSIM that equates to the Type I and Type II error of 0.05 for use with the Sign Test is an N value of 14.
A prospective                         power                        curve was generated using MARSSIM Power 2000, a software package developed under the sponsorship of the United States Nuclear Regulatory Commission (NRC) for implementation of the MARSSIM in support of the decommissioning license termination rule (10 CFR 20, Subpart E). The result of the MARSSIM Power 2000 computer run showed adequate power for the survey design.
Given that the survey unit is Class             3, sample locations were selected             randomly. The                                                random locations of the soil             samples were selected using Visual Sample Plan (VSP)             , in accordance with FCSD-RA-LT-302 (Reference                                                                                                                                               3). Input parameters included use of aerial photographs and the random sampling tool set with a predetermined number (14) of samples              . The random coordinates generated with VSP            were integrated with a GPS to identify  sample locations in the field.               Table 5-2lists the                                     random samples collected for FSS and the corresponding GPS coordinates, based on the Nebraska State Plan            e North American Datum 1983 coordinate system                                                                                                                        .

Table 5 Random Sample Locations Sample ID                       Northing                Easting 8110X-3-FR-GSSX-001                    195215.6302             827151.915 8110X-3-FR-GSSX-002                    195048.5251            827529.7539 8110X-3-FR-GSSX-003                    195219.3567            827254.8514 8110X-3-FR-GSSA-004                    195135.7104            827435.2942 8110X-3-FR-GSSX-005                    195317.3464             827018.097 8110X-3-FR-GSSX-006                    194990.4016            827521.8823

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

Sample ID             Northing        Easting 8110X-3-FR-GSSX-007       195186.5685     827269.9896 8110X-3-FR-GSSX-008       195077.5869     827364.4494 8110X-3-FR-GSSX-009       195273.7537     827112.5567 8110X-3-FR-GSSX-010        195165.817      827411.521 8110X-3-FR-GSSX-011       195035.0706     827600.5988 8110X-3-FR-GSSX-012       194999.6107     827592.6379 8110X-3-FR-GSSX-013       195078.6633      827506.139 8110X-3-FR-GSSX-014        195107.725      827329.027

In accordance with the sample plan, at least one judgmental sample is required from the survey unit. The number of judgmental samples and measurements collected was 35, which brings the total number of samples collected for the FSS of Survey Unit 8110 to 49. Table                                                                                                                                                                                     5-3                        lists the judgmental samples collected for FSS and the corresponding GPS coordinates.

Table 5 Judgmental Sample Locations Sample ID            Northing       Easting 8110X-3-FJ-GSSX-015       195110.434     827464.51 8110X-3-FJ-GSSX-016       195105.31     827472.923 8110X-3-FJ-GSSX-017       195099.917    827476.429 8110X-3-FJ-GSSX-018       195086.597    827481.282 8110X-3-FJ-GSSX-019       195159.605    827308.356 8110X-3-FJ-GSSX-020       195166.089    827308.356 8110X-3-FJ-GSSX-021       195173.095    827311.703 8110X-3-FJ-GSSX-022       195185.959    827325.926 8110X-3-FJ-GSSX-023       191858.54     827318.605 8110X-3-FJ-GSSA-024       195190.978    827323.102 8110X-3-FJ-GSSX-025       195194.325    827326.971 8110X-3-FJ-GSSX-026       195252.406    827143.956 8110X-3-FJ-GSSX-027       195268.428    827154.417 8110X-3-FJ-GSSX-028       195269.673    827161.888 8110X-3-FJ-GSSX-029       195240.858     827230.97 8110X-3-FJ-GSSX-030       195153.036    827310.087 8110X-3-FJ-GSSX-031       195148.284    827311.126 8110X-3-FJ-GSSX-032       195149.769    827314.987 8110X-3-FJ-GSSX-033       195267.538    827166.178 8110X-3-FJ-GSSX-034       195266.632    827172.293 8110X-3-FJ-GSSX-035       195120.726     827453.07 8110X-3-FJ-GSSX-036       195115.829    827445.982 8110X-3-FJ-GSSX-037       195166.559    827355.652

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

Sample ID                    Northing             Easting 8110X-3-FJ-GSSX-038                195109.468          827406.891 8110X-3-FJ-GSSX-039                195134.628          827414.614 8110X-3-FJ-GSSX-040                195146.821           827419.93 8110X-3-FJ-GSSX-041                195142.652          827425.737 8110X-3-FJ-GSSA-042                195264.326          827179.717 8110X-3-FJ-GSSX-043                195237.587           827177.32 8110X-3-FJ-GSSX-044                195257.695          827196.076 8110X-3-FJ-GSSX-045                195142.424          827318.408 8110X-3-FJ-GSSX-046                195150.008           827314.02 8110X-3-FJ-GSSX-047                195143.522          827329.667 8110X-3-FJ-GSSX-048                 195170.85          827332.033 8110X-3-FJ-GSSX-049                 195176.98          827345.113

The implementation of quality control (QC)measures as referenced by Section 5.6.3 of the LTP and FCSD                                                   -RA-                                                                  LT-100, &#xb3;                                                       Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station' (QAPP      Reference 8) includes the collection of a soil sample for &#xb3;split sample' analysis on 5% of the soil samplestaken in a survey unit with the locations selected at random.Six             soil             sample   s, 8110X-3-FR-GSSB-004, 8110X-3-FQ-GSSX-007, 8110X-3-FJ-GSSB-024, 8110X-3-FQ-GSSX-035, 8110X-3-FJ-GSSB-042, and 8110X-3-FQ-GSSX-049 weredesignated               for split  or duplicate sample QC analysis for the FSS of Survey Unit 8110.
Section 5.3.4 and Table 5                                            -20 of the LTP                                                specify that for Class        3 open land survey units, surface scans will be performed on a judgmental percentage of the surface area in the survey unit. For Survey Unit 8110, 10% scan coveragewas selected                                                                                                                           , which equals 10,561 m                                         2.
For this Class 3 open land survey unit, the &#xb3;Investigation Levels' for area scanning and soil sample measurement results are those levels specified in the Table 5-24 of the LTP and are reproduced below in Table     5-4.

Table 5 Investigation Levels Classification                       Scan Investigation Levels                           Direct Investigation Levels Class 3              >Operational DCGL or >MDCscan if MDCscan is                       >0.5 Operational DCGL greater than Operational DCGL

Table 5-5 provides a synopsis of the survey design for                                                             Survey Unit 8110.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

Table 5 Synopsis of Survey Design Feature                                                Design Criteria                                                         Basis Survey Unit Surface Area                                                                                                                                                                                                                                                                  105,611 m2                                                                                                                                                                                                                                                                                                                                                                                                                                             GPS Number of Random Samples                                                             14                                         *                         / = 3 (adjusted)
(N)
* MARSSIM Table 5.5
* Co-60:                       1.06 pCi/g
* Cs-137: 3.65 pCi/g Operational DCGLs for surface DCGLs
* Eu-152: 2.36 pCi/g                     soil, LTP,                                                                         Table 5-8
* C-14: 15.9 pCi/g Scan and Direct Investigation                                                   Table 5-5                                                                                                                                                                                                                                                                                                                                                            LTP,                                                                         Table 5-24 Levels Scan Areal Coverage                                   10,561 m2, 10% areal coverage                                              LTP, Table 5-20

Judgmental Samples                                                                                                                                                                                                                                                                                                                                                                                              1 Per Survey Design 35                                         Actual Number Obtained HTD ROC Analysis                                                                                                                                                                                                                                                                                                                                                            100% LTP, Section 5.2.6.2 49                                    Number of Samples Analyzed 1 duplicate and 1 split sample                                          LTP, Section 5.6.3 QC                                               selected at random                                       Actual Number Obtained 6
: 6.                                                                                      SURVEY IMPLEMENTATION

For Survey Unit 8110, compliance with the unrestricted release criteria was demonstrated through a combination of soil scanning with a Ludlum Model 44-20 gamma detector                                                             and the sampling of soil for isotopic analysis .
A License Termination/Final Status Survey (LT/FSS) Supervisor performed a visual inspection and walk-down of the survey unit on January 24, 2022, prior to performing FSS. The purpose of the walk-down was to assess the physical condition of the survey unit, evaluate access points and travel paths, and identify potentially hazardous conditions. At the time of survey, the soil in the survey unit was dry and free of any considerable constraint for the collection of samples and scan measurements.
FSS field activities were conducted  under the FSS            sample plan and included DQOs, survey design, detailed FSS instructions, job safety analysis, and related procedures for reference. FSS field activities were projected to take 10 working days to complete. Daily briefings were conducted to discuss the expectations for job performance and to review the            safety aspects of the job. A Field Log                                                                        was used to document field activities and other information pertaining to the

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

performance of the FSS. FSS field activities commenced on                          January 24, 2022, and concluded on February 1, 2022.
A total of 14 different scan                              areas were scanned using a Ludlum Model 3001 paired with a Ludlum Model 44-20 (3 x 3) sodium iodide (NaI) detector and Trimble GPS                                                                                                      unit. The background was established as the average of fiveone                                  -minute static measurements, while maintaining the detector 6 from the soil. In   Survey Unit 8110, background ranged from 20,040 counts per minute (cpm) up to 23,760 cpm.
All designated scan areas were scanned using  the Model 44-20 detector operated in the rate-                                             meter mode and using audio response. The probe was positioned no more than 2 from the ground and was moved at a scan speed of approximately 0.25 m per second. In accordance with                                                                                                 FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors                                                           (Reference             9), scan MDC was sufficient to detect residual radioactivity at the action level. Complete scan results are provided in Attachment 2.
The 14 random sample locations were marked with             flags based on GPS coordinates provided.
Each soil sample consisted of approximately  1 liter of soil. The soil sample media was sifted to remove stones and other media larger than 1 centimeter in diameter. All soil             samples were collected, controlled, transported, stored, and transferred to the on                                                -site laboratory using the chain-of-custody process from                                                                                     FCSD-RA-LT-205,                                                           Chain-of-Custody Protocol for Site Characterization and Final Status Survey  (Reference             10), and in accordance with FCSD                                                                                   -RA-                                                                  LT-203, Sample Media Collection for Site Characterization and Final Status Survey   (            Reference 11), and FCSD                                                                                                           -RA-                                                                  LT-204,                                                           Sample Media Preparation for Site Characterization and Final Status Survey (Reference 12).
The survey design specified that 100% of the             samples were required for the HTD ROC analysis.
In total, 49 samples were selected for HTD radionuclide analysis.
The implementation of survey specific QC measures included the collection of six             samples (8110X-3-FR-GSSB-004, 8110X-3-FQ-GSSX-007, 8110X                                  FJ-GSSB-024, 8110X-3-FQ-GSSX-035, 8110X-3-FJ-GSSB-042, and 8110X-3-FQ-GSSX-049) for split             or duplicate sample analysis.
: 7.                                                                                      SURVEY RESULTS

All areas identified in the FSS  sample plan were scanned for elevated activity levels.             The 10,561 m2 scan requirement was achieved by scanning             14 areaswithin                                                                                       accessible land. Figure 16-1 presents the scan areas within the unit. Judgmental samples did not have an action level, as the readings were taken to verify the readings identified in the   Z-Score analysis. Table                         7-1 provides

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

an overview of the scan results for all 1 m2 scan areas around each sample location and the gamma walkovers. Complete scan results are provided in Attachment                                     2, Table 16-1.

Table 7 Synopsis of Scan Results

Min Scan      Max Scan        Action         Scan Scan Area      Logged        Logged          Level       Alarms?       Investigation Reading       Reading         (cpm)         (Y/N)         Samples (cpm)         (cpm) 1          18027         22000          21420           Y               0 2          19652         22600          21420           Y               0 3          14056         23200          21420           Y               0 4          12613         25600          21420           Y               0 5          17546         21800          21420           Y               0 6          19291         23000          21420           Y               0 7          12373         21600          21420           Y               0 8          15440         21000          21420           N               0 9          17365         21000          21420           N               0 10          19953         20700          21420           N               0 11          18990         23200          21420           Y               0 12          17546         24200          21420           Y               0 13          20675         25900          21420           Y               0 14          17666         23000          21420           Y               0 GW 1          12921         34990          23645           Y               8 GW 2          9968          27604          23233           Y               0 GW 3          18144         23945          22203           Y               0 GW 4          14839         30877          23974           Y               4 GW 5          13039         25472          23274           Y               3 GW 6          13400         29359          25105           Y               6 GW 7          10630         24091          22636           Y               0 GW 8          10028         29412          22203           Y               1 GW 9          11711         36994          22018           Y               1 GW 10         17434         27882          22862           Y               2 GW 11         9971          40979          22224           Y               6 GW 12         17733         27721          23706           Y               3 GW 13         12090         25334          21276           Y               0 GW 14         10960         25555          21657           Y               1 QC GW 10        18027         30136          23624           Y               0

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

For Survey Unit 8110 Grid #1, count rates ranged between                                                                                                                                                                                                             12,921 cpm and 34,990 cpm, with a mean count rate of 23,223 cpm and a standard deviation of 3,832 cpm. Figure                         7-1below presents a map of the gamma walkover for Survey Unit 8110 Grid #1.

Figure 7 Survey Unit 8110 Grid #1                                                                                                                         GPS Scan Results

23,645

23,645

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

An evaluation of the Survey Unit 8110 Grid #1 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement, (i.e.,
+3 Z-Score). Eight locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-2 below presents the map of the +3 Z-                                                Score measurements within Survey Unit 8110 Grid #1 and the selected biased sampling locations.

Figure 7 Survey Unit 8110 Grid #1                                                                                                                         Z-Scoreand Sample Locations Map

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

For Survey Unit 8110 Grid #2, count rates ranged between                                                                                                                                                                                                             9,968 cpm and 27,604 cpm, with a mean count rate of 22,354 cpm and a standard deviation of 1,831 cpm. Figure                         7-3below presents a map of the gamma walkover for Survey Unit 8110 Grid #2.

Figure 7 Survey Unit 8110 Grid #2                                                                                                                         GPS Scan Results

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

An evaluation of the Survey Unit 8110 Grid #2 data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement. No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-4 below present the map of the +3 Z-                        Score measurements within             Survey Unit 8110 Grid #2.

Figure 7 Survey Unit 8110 Grid #2                                                                                                                         Z-Score Map

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

For Survey Unit 8110 Grid #3, count rates ranged between                                                                                                                                                                                                             18,144 cpm and 23,945 cpm, with a mean count rate of 21,249 cpm and a standard deviation of 843 cpm. Figure 7-5below presents a map of the gamma walkover for  Survey Unit 8110 Grid #3.

Figure 7 Survey Unit 8110 Grid #3                                                                                                                         GPS Scan Results

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

An evaluation of the Survey Unit 8110 Grid #3 data set was performed to                                                              assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement. No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-6 below present the map of the +3 Z-                        Score measurements within             Survey Unit 8110 Grid #3.

Figure 7 Survey Unit 8110 Grid #3                                                                                                                         Z-Score Map

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

For Survey Unit 8110 Grid #4, count rates ranged between                                                                                                                                                                                                             14,839 cpm and 30,877 cpm, with a mean count rate of 22,461 cpm and a standard deviation of 770 cpm. Figure 7-7below presents a map of the gamma walkover for  Survey Unit 8110 Grid #4.

Figure 7 Survey Unit 8110 Grid #4                                                                                                                         GPS Scan Results

23,974

23,974

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

An evaluation of the Survey Unit 8110 Grid #4 data set was performed to                                                              assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement. Four locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-8 below present the map of the +3 Z-                        Score measurements within             Survey Unit 8110 Grid #4 and the selected biased sampling locations.

Figure 7 Survey Unit 8110 Grid #4                                                                                                                         Z-Score Map

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

For Survey Unit 8110 Grid #5, count rates ranged between                                                                                                                                                                                                             13,039 cpm and 25,472 cpm, with a mean count rate of 21,655 cpm and a standard deviation of 913 cpm. Figure 7-9below presents a map of the gamma walkover for  Survey Unit 8110 Grid #5.

Figure 7 Survey Unit 8110 Grid #5                                                                                                                         GPS Scan Results

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

An evaluation of the Survey Unit 8110 Grid #5 data set was performed to                                                              assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement.
Three locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-10 below present the map of the +3 Z-                                                Score measurements within Survey Unit 8110Grid #5 and the selected biased sampling locations.

Figure 7 Survey Unit 8110 Grid #5                                                                                                                         Z-Scoreand Sample Locations Map

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

For Survey Unit 8110 Grid #6, count rates ranged between 13,400 cpm and 29,359 cpm, with a mean count rate of 24,456 cpm and a standard deviation of 1,119 cpm. Figure                         7-11 below presents a map of the gamma walkover for Survey Unit 8110 Grid #6.

Figure 7 Survey Unit 8110 Grid #6 GPS Scan Results

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

An evaluation of the Survey Unit 8110 Grid #6 data set was performed to                                                              assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement. Six locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-12below present the map of the +3 Z-                                                                                                 Score measuremen            ts within Survey Unit 8110 Grid #6 and the selected biased sampling locations.

Figure 7 Survey Unit 8110 Grid #6 Z-Scoreand Sample Locations Map

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

For Survey Unit 8110 Grid #7, count rates ranged between 10,630 cpm and 24,091 cpm, with a mean count rate of 20,994 cpm and a standard deviation of 2,075 cpm. Figure                         7-13 below presents a map of the gamma walkover for the Grid #7.

Figure 7 Survey Unit 8110 Grid #7 GPS Scan Results

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

An evaluation of the Survey Unit 8110 Grid #7 data set was performed to                                                              assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement. No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-14below present the map of the +3 Z-                                                                                                 Score measurements within             Survey Unit 8110 Grid #7.

Figure 7 Survey Unit 8110 Grid #7 Z-Score Map

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

For Survey Unit 8110 Grid #8, count rates ranged between 10,028 cpm and 29,412 cpm, with a mean count rate of 21,341 cpm and a standard deviation of 2,591 cpm. Figure                         7-15 below presents a map of the gamma walkover for Survey Unit 8110 Grid #8.

Figure 7 Survey Unit 8110 Grid #8 GPS Scan Results

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

An evaluation of the Survey Unit 8110 Grid #8 data set was performed to                                                              assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement. One location was                                                            selected for biased sample collection based on evaluation of the gamma walkover data. This                        biased location represented the maximum measurements encountered within the scan area. Figure 7-16below present the map of the +3 Z-                                                                                                 Score measurements within             Survey Unit 8110 Grid #8 and the selected biased sampling locations.

Figure 7 Survey Unit 8110 Grid #8 Z-Scoreand Sample Locations Map

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

For Survey Unit 8110 Grid #9, count rates ranged between 11,711 cpm and 36,994 cpm, with a mean count rate of 20,996 cpm and a standard deviation of 2,028 cpm. Figure                         7-17 below presents a map of the gamma walkover for Survey Unit 8110 Grid #9.

Figure 7 Survey Unit 8110 Grid #9 GPS Scan Results

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

An evaluation of the Survey Unit 8110 Grid #9 data set was performed to                                                              assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement. One location was                                                            selected for biased sample collection based on evaluation of the gamma walkover data. This                         biased location represented the maximum measurements encountered within the scan area. Figure 7-18below present the map of the +3 Z-                                                                                                 Score measurements within             Survey Unit 8110 Grid #9 and the selected biased sampling locations.

Figure 7 Survey Unit 8110 Grid #9 Z-Scoreand Sample Locations Map

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

For Survey Unit 8110 Grid #10, count rates ranged between 17,434 cpm and 27,882 cpm, with a mean count rate of 21,909 cpm and a standard deviation of 1,342 cpm. Figure                         7-19 below presents a map of the gamma walkover for Survey Unit 8110 Grid #10.

Figure 7 Survey Unit 8110 Grid #                                                                                                                        10 GPS Scan Results

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

An evaluation of the Survey Unit 8110 Grid #                                                            10 data set was performed to                                                              assess the                                                                                                                      small areas of elevated activity which exceeded three standard deviations above the mean measurement. Two locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-20below present                                                            s the map of the +3 Z-Score measurements within             Survey Unit 8110 Grid #10 and the selected biased sampling locations.

Figure 7 Survey Unit 8110 Grid #                                                                                                                        10 Z-Score and Sample Locations Map

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

For Survey Unit 8110 Grid #                                                                                                                        11, count rates ranged between                                                 9,971 cpm and 40,979 cpm, with a mean count rate of 23,270                                                                                     cpm and a standard deviation of 4,327 cpm. Figure                         7-21 below presents a map of the gamma walkover for Survey Unit 8110 Grid #                                    11.

Figure 7 Survey Unit 8110 Grid #                                                                                                                        11 GPS Scan Results

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

An evaluation of the Survey Unit 8110 Grid #11 data set was performed to assess the                                                                                                                                                          small areas of elevated activity which exceeded three standard deviations above the mean measurement. Six locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-22below present the map of the +3 Z-                                                                                                 Score measurements within             Survey Unit 8110 Grid #11 and the selected biased sampling locations.

Figure 7 Survey Unit 8110 Grid #                                                                                                                        11 Z-Score and Sample Locations Map

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

For Survey Unit 8110 Grid #                                                                                                                        12, count rates ranged between                                                 17,733 cpm and 27,721 cpm, with a mean count rate of 22,506 cpm and a standard deviation of 1,269 cpm. Figure                         7-23 below presents a map of the gamma walkover for the Grid #  12.

Figure 7 Survey Unit 8110 Grid #                                                                                                                        12 GPS Scan Results

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

An evaluation of the Survey Unit 8110 Grid #12 data set was performed to assess the                                                                                                                                                          small areas of elevated activity which exceeded three standard deviations above the mean measurement.
Three locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-24 below present the map of the +3 Z-                                                Score measurements within Survey Unit 8110 Grid #12 and the selected biased sampling locations.

Figure 7 Survey Unit 8110 Grid #                                                                                                                        12 Z-Score and Sample Locations Map

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

For Survey Unit 8110 Grid #13, count rates ranged between 12,090 cpm and 25,334 cpm, with a mean count rate of 21,529 cpm and a standard deviation of 1,360 cpm. Figure                         7-25 below presents a map of the gamma walkover for the Grid #13.

Figure 7 Survey Unit 8110 Grid #13 GPS Scan Results

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

An evaluation of the Survey Unit 8110 Grid #13 data set was performed to assess the                                                                                                                                                          small areas of elevated activity which exceeded three standard deviations above the mean measurement. No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure                        7-26below present the map of the +3 Z-                                                                                                 Score measurements within             Survey Unit 8110 Grid #13.

Figure 7 Survey Unit 8110 Grid #13 Z-Score Map

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

For Survey Unit 8110 Grid #14, count rates ranged between 10,960 cpm and 25,555 cpm, with a mean count rate of 20,582 cpm and a standard deviation of 1,565 cpm. Figure                         7-27 below presents a map of the gamma walkover for Survey Unit 8110 Grid #14.

Figure 7 Survey Unit 8110 Grid #14 GPS Scan Results

21,657

21,657

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

An evaluation of the Survey Unit 8110 Grid #14 data set was performed to assess the                                                                                                                                                          small areas of elevated activity which exceeded three standard deviations above the mean measurement. One location was                                                            selected for biased sample collection based on evaluation of the gamma walkover data. This                         biased location represented the maximum measurements encountered within the scan area. Figure 7-28below present the map of the +3 Z-                                                                                                 Score measurements within             Survey Unit 8110 Grid #14 and the selected biased sampling locations.

Figure 7 Survey Unit 8110 Grid #14 Z-Score and Sample Locations Map

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

For Survey Unit 8110 Grid #10 QC, count rates ranged between 18,027 cpm and 30,136                                                                                                                                                                                                                                                                                                                   cpm, with a mean count rate of 2 3,285 cpm and a standard deviation of 1,528 cpm. Figure 7-29 below presents a map of the gamma walkover for Survey Unit 8110 Grid #10 QC.

Figure 7 Survey Unit 8110 Grid #10 QC                                                                                                GPS Scan Results

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

An evaluation of the Survey Unit 8110 Grid #10 QCdata set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement.
No location           s wereselected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-30 below present the map of the +3 Z-                                                                        Score measurements within Survey Unit 8110 Grid #10 QC.

Figure 7 Survey Unit 8110 Grid #10 QC                                                                                                Z-Score

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

The on-site laboratory analyzed the 14 soil samples taken for nonparametric statistical testing using the on-site gamma spectroscopy system. A summary of the results for the 14 samples collected for nonparametric statistical testing is provided in   Table 7-2. Gamma spectroscopy results revealed that             Cs-137 waspositively identifiedin                                                                                         one of the random samples. C-14 was positively identified in  one of the random samples; however, a surrogate ratio calculation was not necessary as Cs-137 was not identified in the corresponding sample. No other ROCs were positively identified. The off-site laboratory, GEL Laboratories, analyzed the 14 random samples for the HTD ROC C-14. C-14 was positively identified                                                         detected in one of the             random samples.
The maximum operational sum  of fractions (OpSOF) for random samples is 0.            2759.
The basic statistics for the random sample population, as compared to the BcDCGLs, and the survey unit dose aresummarized in                                               Table 7-3.
The SOF or unity rule is the mathematical test used to evaluate compliance with radiological criteria for license termination when more than one radionuclide has been determined to be potentially present. The equation for the unity rule is:

Equation 7 Unity Rule C1                                                                                                                                                                                                                                                                                      +                                                                                                                                                                                                                                                                                                        DCGLC2+............Cn1 DCGL1               DCGL2                                   n Where:                                                                                                                                                                                                               Cn                                                                                                                                                             =                                 concentration of radionuclide n DCGLn                                                          =                                 DCGL of radionuclide n           .

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Samples Comprising the Statistical Sample Population

Activity               OpDCGL                      Fraction Sample ID                              ROC               (pCi/g)                  (pCi/g)                        of              OpSOF OpDCGL

Co-60           1.10E-01                 1.06E+00                   1.04E-01 Cs-137           1.03E-01                 3.65E+00                   2.82E-02 8110X-3-FR-GSSX-001                               Eu-152           0.00E+00                 2.36E+00                  0.00E+00               0.13199

C-14                                                                                                                                              0.00E+00                                                             1.59E+01                                                                     0.00E+00

8110X-3-FR-GSSX-002                                          Co-60               5.25E-02   1.06E+00                   4.95E-02              0.09528 Cs-137           1.67E-01                 3.65E+00                   4.58E-02

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

Activity     OpDCGL         Fraction Sample ID             ROC       (pCi/g)       (pCi/g)           of       OpSOF OpDCGL

Eu-152    0.00E+00      2.36E+00       0.00E+00 C-14    0.00E+00      1.59E+01       0.00E+00 Co-60               0.00E+00 1.06E+00 0.00E+00 8110X-3-FR-GSSX-003         Cs-137    2.00E-02      3.65E+00       5.48E-03     0.00548 Eu-152               0.00E+00 2.36E+00 0.00E+00 C-14    0.00E+00      1.59E+01       0.00E+00 Co-60    6.87E-02      1.06E+00       6.48E-02 8110X-3-FR-GSSA-004         Cs-137    6.46E-02      3.65E+00       1.77E-02     0.08251 Eu-152    0.00E+00      2.36E+00       0.00E+00 C-14    0.00E+00      1.59E+01       0.00E+00 Co-60    4.98E-02      1.06E+00       4.70E-02 8110X-3-FR-GSSX-005         Cs-137    5.20E-02      3.65E+00       1.42E-02     0.06123 Eu-152    0.00E+00      2.36E+00       0.00E+00 C-14    0.00E+00      1.59E+01       0.00E+00 Co-60    8.90E-02      1.06E+00       8.40E-02 8110X-3-FR-GSSX-006         Cs-137    1.57E-01      3.65E+00       4.30E-02     0.12698 Eu-152    0.00E+00      2.36E+00       0.00E+00 C-14    0.00E+00      1.59E+01       0.00E+00 Co-60             0.00E+00 1.06E+00   0.00E+00 8110X-3-FR-GSSX-007         Cs-137    5.72E-02      3.65E+00       1.57E-02     0.01567 Eu-152               0.00E+00 2.36E+00 0.00E+00 C-14    0.00E+00      1.59E+01       0.00E+00 Co-60    1.81E-01      1.06E+00       1.71E-01 8110X-3-FR-GSSX-008         Cs-137    5.44E-02      3.65E+00       1.49E-02     0.27591 Eu-152    2.13E-01      2.36E+00       9.03E-02 C-14    0.00E+00      1.59E+01       0.00E+00 Co-60    2.47E-02      1.06E+00       2.33E-02 Cs-137    0.00E+00      3.65E+00       0.00E+00 8110X-3-FR-GSSX-009         Eu-152    0.00E+00      2.36E+00       0.00E+00     0.02330

C-14                                                                                                                                              0.00E+00                                                          1.59E+01                                                                  0.00E+00 8110X-3-FR-GSSX-010          Co-60    0.00E+00      1.06E+00       0.00E+00     0.00000 Cs-137    0.00E+00      3.65E+00       0.00E+00

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

Activity      OpDCGL         Fraction Sample ID             ROC       (pCi/g)       (pCi/g)           of       OpSOF OpDCGL

Eu-152    0.00E+00      2.36E+00       0.00E+00 C-14     0.00E+00      1.59E+01       0.00E+00 Co-60    3.41E-02      1.06E+00       3.22E-02 8110X-3-FR-GSSX-011         Cs-137    1.39E-02      3.65E+00       3.81E-03     0.03598 Eu-152               0.00E+00 2.36E+00 0.00E+00 C-14     0.00E+00      1.59E+01       0.00E+00 Co-60    8.06E-02      1.06E+00       7.60E-02 8110X-3-FR-GSSX-012         Cs-137    4.08E-02      3.65E+00       1.12E-02     0.15305 Eu-152    5.22E-02      2.36E+00       2.21E-02 C-14     6.95E-01      1.59E+01       4.37E-02 Co-60    6.99E-02      1.06E+00       6.59E-02 8110X-3-FR-GSSX-013         Cs-137    0.00E+00      3.65E+00       0.00E+00     0.06594 Eu-152               0.00E+00 2.36E+00 0.00E+00 C-14     0.00E+00      1.59E+01       0.00E+00 Co-60    0.00E+00      1.06E+00       0.00E+00 8110X-3-FR-GSSX-014         Cs-137    5.31E-02      3.65E+00       1.45E-02     0.01455 Eu-152    0.00E+00      2.36E+00       0.00E+00 C-14     0.00E+00      1.59E+01       0.00E+00 Note: Bold values indicate concentrations greater than MDC.

Table 7 Basic Statistical Properties of  Random Sample Populationand Survey Unit Dose Mean       Median         Max          Min        Std. BcDCGL         Avg ROC                                                          Dev.                   BcSOF      Avg Dose (pCi/g)      (pCi/g)      (pCi/g)     (pCi/g)     (pCi/g)     (pCi/g)    per ROC     per ROC Co-60     5.43E-02     5.12E-02     1.81E-01    0.00E+00    5.16E-02    3.77E+00    1.44E-02    3.60E-01 Cs-137    5.59E-02     5.26E-02     1.67E-01    0.00E+00    5.37E-02    1.31E+01    4.27E-03    1.07E-01 Eu-152    1.89E-02    0.00E+00      2.13E-01    0.00E+00    5.76E-02    8.41E+00    2.25E-03    5.63E-02 C-14     4.96E-02    0.00E+00      6.95E-01    0.00E+00    1.86E-01    5.70E+01    8.71E-04    2.18E-02 Mean   base case sum of fractions (   BcSOF) = 0.0218 DOSE ASSIGNED TO SURVEY UNIT =                 0.5449 mrem/yr

The on-site laboratory analyzed the 35 judgmental soil             samples using the on-site gamma spectroscopy system. A summary of the analytical results for the judgmentalsoil samples is provided in Table 7-4. Gamma spectroscopy results revealed                                                 that Cs-137 was positively identified in 2 judgmental samples. No other ROCs were positively identified                                                                                                                                       .

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

GEL Laboratories analyzed the 35 judgmental samples for                                                                          the HTD ROC C-14. C-14 was not detected in any of the judgmental samples. The maximum OpSOF for judgmental samples is 0.1690.

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples Measured        OpDCGL           Fraction Sample ID               ROC        Activity                           of         OpSOF (pCi/g)         (pCi/g)       OpDCGL Co-60      6.43E-02        1.06E+00        6.07E-02 8110X-3-FJ-GSSX-015           Cs-137     4.88E-02        3.65E+00        1.34E-02       0.15242 Eu-152     1.85E-01        2.36E+00        7.84E-02 C-14      0.00E+00        1.59E+01       0.00E+00 Co-60      7.69E-02        1.06E+00        7.25E-02 8110X-3-FJ-GSSX-016           Cs-137     1.06E-01        3.65E+00        2.90E-02       0.10472 Eu-152     7.38E-03        2.36E+00        3.13E-03 C-14      0.00E+00        1.59E+01       0.00E+00 Co-60      6.03E-02        1.06E+00        5.69E-02 8110X-3-FJ-GSSX-017           Cs-137     8.21E-03        3.65E+00        2.25E-03       0.05914 Eu-152     0.00E+00        2.36E+00       0.00E+00 C-14      0.00E+00        1.59E+01       0.00E+00 Co-60      3.48E-02        1.06E+00        3.28E-02 8110X-3-FJ-GSSX-018           Cs-137     1.05E-01        3.65E+00        2.88E-02       0.06160 Eu-152     0.00E+00        2.36E+00       0.00E+00 C-14      0.00E+00        1.59E+01       0.00E+00 Co-60      0.00E+00        1.06E+00       0.00E+00 8110X-3-FJ-GSSX-019           Cs-137     1.67E-02        3.65E+00        4.58E-03       0.04280 Eu-152     8.48E-02        2.36E+00        3.59E-02 C-14      3.65E-02        1.59E+01        2.30E-03 Co-60      1.35E-02        1.06E+00        1.27E-02 Cs-137     7.73E-03        3.65E+00        2.12E-03 8110X-3-FJ-GSSX-020           Eu-152     1.83E-02        2.36E+00        7.75E-03       0.03336

C-14                                                                                                                                                                    1.71E-01                                                                                1.59E+01                                                                                1.08E-02

Co-60      6.36E-03        1.06E+00        6.00E-03 8110X-3-FJ-GSSX-021           Cs-137     0.00E+00        3.65E+00       0.00E+00        0.06608 Eu-152     1.17E-01        2.36E+00        4.96E-02 C-14      1.67E-01        1.59E+01        1.05E-02

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

Measured       OpDCGL          Fraction Sample ID             ROC        Activity                          of         OpSOF (pCi/g)        (pCi/g)      OpDCGL Co-60      2.32E-03       1.06E+00       2.19E-03 8110X-3-FJ-GSSX-022          Cs-137     4.11E-02       3.65E+00       1.13E-02       0.02339 Eu-152    0.00E+00        2.36E+00       0.00E+00 C-14      1.58E-01       1.59E+01       9.94E-03 Co-60      1.50E-02       1.06E+00       1.42E-02 8110X-3-FJ-GSSX-023          Cs-137     6.24E-03       3.65E+00       1.71E-03       0.07704 Eu-152     1.37E-01       2.36E+00       5.81E-02 C-14      4.97E-02       1.59E+01       3.13E-03 Co-60      3.15E-02       1.06E+00       2.97E-02 8110X-3-FJ-GSSA-024          Cs-137     9.22E-02       3.65E+00       2.53E-02       0.16903 Eu-152     2.66E-01       2.36E+00       1.13E-01 C-14      2.13E-02       1.59E+01       1.34E-03 Co-60      1.07E-01       1.06E+00       1.01E-01 8110X-3-FJ-GSSX-025          Cs-137     1.08E-02       3.65E+00       2.96E-03       0.10390 Eu-152    0.00E+00        2.36E+00       0.00E+00 C-14     0.00E+00        1.59E+01       0.00E+00 Co-60      1.10E-02       1.06E+00       1.04E-02 8110X-3-FJ-GSSX-026          Cs-137    0.00E+00        3.65E+00       0.00E+00       0.02025 Eu-152     2.33E-02       2.36E+00       9.87E-03 C-14     0.00E+00        1.59E+01       0.00E+00 Co-60      3.14E-02       1.06E+00       2.96E-02 8110X-3-FJ-GSSX-027          Cs-137     1.24E-02       3.65E+00       3.40E-03       0.05491 Eu-152    0.00E+00        2.36E+00       0.00E+00 C-14      3.48E-01       1.59E+01       2.19E-02 Co-60      1.28E-01       1.06E+00       1.21E-01 Cs-137    0.00E+00        3.65E+00       0.00E+00 Eu-152    0.00E+00        2.36E+00       0.00E+00 8110X-3-FJ-GSSX-028                                                                  0.12075

C-14                                                                                                                                                               0.00E+00                                                                          1.59E+01                                                                           0.00E+00

Co-60      7.33E-02       1.06E+00       6.92E-02 8110X-3-FJ-GSSX-029          Cs-137     1.38E-02       3.65E+00       3.78E-03       0.14108 Eu-152     1.31E-01       2.36E+00       5.55E-02 C-14      2.01E-01       1.59E+01       1.26E-02

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

Measured       OpDCGL           Fraction Sample ID              ROC       Activity                          of         OpSOF (pCi/g)        (pCi/g)       OpDCGL Co-60      1.64E-02       1.06E+00        1.55E-02 8110X-3-FJ-GSSX-030          Cs-137     0.00E+00       3.65E+00       0.00E+00       0.02522 Eu-152     0.00E+00       2.36E+00       0.00E+00 C-14      1.55E-01       1.59E+01        9.75E-03 Co-60      5.92E-02       1.06E+00        5.58E-02 8110X-3-FJ-GSSX-031          Cs-137     1.34E-01       3.65E+00        3.67E-02      0.09256 Eu-152     0.00E+00       2.36E+00       0.00E+00 C-14      0.00E+00       1.59E+01       0.00E+00 Co-60      8.83E-03       1.06E+00        8.33E-03 8110X-3-FJ-GSSX-032          Cs-137     2.02E-02       3.65E+00        5.53E-03      0.03098 Eu-152     4.04E-02       2.36E+00        1.71E-02 C-14      0.00E+00       1.59E+01       0.00E+00 Co-60      7.94E-02       1.06E+00        7.49E-02 8110X-3-FJ-GSSX-033          Cs-137     6.65E-02       3.65E+00        1.82E-02      0.10665 Eu-152     0.00E+00       2.36E+00       0.00E+00 C-14      2.15E-01       1.59E+01        1.35E-02 Co-60      2.13E-02       1.06E+00        2.01E-02 8110X-3-FJ-GSSX-034          Cs-137     1.01E-01       3.65E+00        2.77E-02      0.05421 Eu-152     1.52E-02       2.36E+00        6.44E-03 C-14      0.00E+00       1.59E+01       0.00E+00 Co-60      0.00E+00       1.06E+00       0.00E+00 8110X-3-FJ-GSSX-035          Cs-137     1.82E-03       3.65E+00        4.99E-04      0.01088 Eu-152     2.45E-02       2.36E+00        1.04E-02 C-14      0.00E+00       1.59E+01       0.00E+00 Co-60      0.00E+00       1.06E+00       0.00E+00 Cs-137     5.06E-02       3.65E+00        1.39E-02 Eu-152     0.00E+00       2.36E+00       0.00E+00 8110X-3-FJ-GSSX-036                                                                  0.02871

C-14                                                                                                                                                                    2.36E-01                                                                                1.59E+01                                                                                1.48E-02

Co-60      4.89E-02       1.06E+00        4.61E-02 8110X-3-FJ-GSSX-037          Cs-137     0.00E+00       3.65E+00       0.00E+00       0.06173 Eu-152     0.00E+00       2.36E+00       0.00E+00 C-14      2.48E-01       1.59E+01        1.56E-02

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

Measured        OpDCGL          Fraction Sample ID              ROC        Activity                         of         OpSOF (pCi/g)        (pCi/g)       OpDCGL Co-60     7.25E-02       1.06E+00        6.84E-02 8110X-3-FJ-GSSX-038          Cs-137    5.57E-02       3.65E+00        1.53E-02      0.11695 Eu-152     7.69E-02       2.36E+00        3.26E-02 C-14     1.12E-02       1.59E+01        7.04E-04 Co-60     3.42E-02       1.06E+00        3.23E-02 8110X-3-FJ-GSSX-039          Cs-137    7.06E-02       3.65E+00        1.93E-02      0.05161 Eu-152     0.00E+00       2.36E+00       0.00E+00 C-14     0.00E+00       1.59E+01       0.00E+00 Co-60     2.54E-02       1.06E+00        2.40E-02 8110X-3-FJ-GSSX-040          Cs-137    1.11E-01       3.65E+00        3.04E-02      0.06400 Eu-152     0.00E+00       2.36E+00       0.00E+00 C-14     1.53E-01       1.59E+01        9.62E-03 Co-60     9.04E-02       1.06E+00        8.53E-02 8110X-3-FJ-GSSX-041          Cs-137    6.79E-02       3.65E+00        1.86E-02      0.13418 Eu-152     7.15E-02       2.36E+00        3.03E-02 C-14     0.00E+00       1.59E+01       0.00E+00 Co-60     1.33E-01       1.06E+00        1.25E-01 8110X-3-FJ-GSSA-042          Cs-137    1.12E-01       3.65E+00        3.07E-02      0.15616 Eu-152     0.00E+00       2.36E+00       0.00E+00 C-14     0.00E+00       1.59E+01       0.00E+00 Co-60     3.43E-02       1.06E+00        3.24E-02 8110X-3-FJ-GSSX-043          Cs-137    6.38E-02       3.65E+00        1.75E-02      0.05393 Eu-152     0.00E+00       2.36E+00       0.00E+00 C-14     6.51E-02       1.59E+01        4.09E-03 Co-60     4.28E-02       1.06E+00        4.04E-02 Cs-137    7.67E-02       3.65E+00        2.10E-02 Eu-152     2.32E-02       2.36E+00        9.83E-03 8110X-3-FJ-GSSX-044                                                                 0.07145

C-14                                                                                                                                                                    3.61E-03                                                                             1.59E+01                                                                             2.27E-04

Co-60     1.30E-03       1.06E+00        1.23E-03 8110X-3-FJ-GSSX-045          Cs-137    1.08E-01       3.65E+00        2.96E-02      0.03082 Eu-152     0.00E+00       2.36E+00       0.00E+00 C-14     0.00E+00       1.59E+01       0.00E+00

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

Measured        OpDCGL          Fraction Sample ID              ROC       Activity                           of        OpSOF (pCi/g)        (pCi/g)       OpDCGL Co-60     3.37E-02       1.06E+00        3.18E-02 8110X-3-FJ-GSSX-046          Cs-137     0.00E+00       3.65E+00       0.00E+00        0.03179 Eu-152     0.00E+00       2.36E+00       0.00E+00 C-14      0.00E+00       1.59E+01       0.00E+00 Co-60     9.29E-02       1.06E+00        8.76E-02 8110X-3-FJ-GSSX-047          Cs-137     2.49E-02       3.65E+00        6.82E-03       0.12731 Eu-152     3.76E-02       2.36E+00        1.59E-02 C-14      2.69E-01       1.59E+01        1.69E-02 Co-60     5.47E-02       1.06E+00        5.16E-02 8110X-3-FJ-GSSX-048          Cs-137     0.00E+00       3.65E+00       0.00E+00        0.07334 Eu-152     5.13E-02       2.36E+00        2.17E-02 C-14      0.00E+00       1.59E+01       0.00E+00 Co-60     1.15E-02       1.06E+00        1.08E-02 8110X-3-FJ-GSSX-049          Cs-137     1.22E-01       3.65E+00        3.34E-02       0.05138 Eu-152     0.00E+00       2.36E+00       0.00E+00 C-14      1.13E-01       1.59E+01        7.11E-03 Note: Bold values indicate concentrations greater than MDC.

The implementation of survey specific QC measures included the collection of six      samples (8110X-3-FR-GSSB-004, 8110X-3-FQ-GSSX-007, 8110X-3-FJ-GSSB-024, 8110X-3-FQ-GSSX-035, 8110X                       FJ-GSSB-042, and 8110X-3-FQ-GSSX-049) for split                                                                         or duplicate sample analysis. The on           -site laboratory analyzed the QC samples using the on-                      site gamma spectroscopy system. A summary of the analytical results for the QC sample              s is provided in Table                                    7-5. Gamma spectroscopy results revealed that Cs-137 was identified in two                                     of the six             QC samples. No other ROCs were positively identified in any QC sample                                                                                                                . The maximum OpSOF for QC samples is 0.0855.

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples Sample ID             ROC         Activity       OpDCGL          Fraction of       OpSOF (pCi/g)         (pCi/g)        OpDCGL Co-60       8.71E-03        1.06E+00         0.00822 8110X-3-FR-GSSB-           Cs-137      1.11E-01        3.65E+00         0.03041         0.03863 004               Eu-152     0.00E+00         2.36E+00         0.00000

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

Sample ID                 ROC          Activity          OpDCGL            Fraction of         OpSOF (pCi/g)           (pCi/g)           OpDCGL C-14        0.00E+00           1.59E+01            0.00000 Co-60        0.00E+00           1.06E+00            0.00000 8110X-3-FQ-GSSX-               Cs-137        3.96E-02          3.65E+00            0.01085 007                 Eu-152       0.00E+00           2.36E+00            0.00000           0.01085 C-14        0.00E+00           1.59E+01            0.00000 Co-60         1.39E-02          1.06E+00            0.01311 8110X-3-FJ-GSSB-              Cs-137        8.82E-02          3.65E+00            0.02416           0.05524 024                 Eu-152        4.24E-02          2.36E+00            0.01797 C-14        0.00E+00           1.59E+01            0.00000 Co-60         4.48E-02          1.06E+00            0.04226 8110X-3-FQ-GSSX-               Cs-137        5.37E-02          3.65E+00            0.01471           0.05698 035                 Eu-152       0.00E+00           2.36E+00            0.00000 C-14        0.00E+00           1.59E+01            0.00000 Co-60         1.73E-04          1.06E+00            0.00016 8110X-3-FJ-GSSB-              Cs-137       0.00E+00           3.65E+00            0.00000           0.00953 042                 Eu-152        2.21E-02          2.36E+00            0.00936 C-14        0.00E+00           1.59E+01            0.00000 Co-60         6.57E-02          1.06E+00            0.06198 8110X-3-FQ-GSSX-               Cs-137        8.59E-02          3.65E+00            0.02353 049                 Eu-152       0.00E+00           2.36E+00            0.00000           0.08552 C-14        0.00E+00           1.59E+01            0.00000 Note: Bold values indicate concentrations greater than MDC.
: 8.                                                                                       QUALITY CONTROL

The on-site laboratory processed six             split and duplicate sample            s (8110X-3-FR-GSSB-004, 8110X-3-FQ-GSSX-007, 8110X-3-FJ-GSSB-024, 8110X-3-FQ-GSSX-035, 8110X                                  FJ-GSSB-042, and 8110X-3-FQ-GSSX-049) using gamma spectroscopy analysis. The data was evaluated using acceptance criteria specified in                                                             NUREG-1576,                                   Multi-Agency Radiological Laboratory Analytical Protocols Manual (Reference                           13) as detailed                                                             in Section 5.6.3.2 of the LTP. There was acceptable agreement between  standard and comparison sample resultsin all cases. Refer to  for data and QCanalysis results.
: 9.                                                                                       INVESTIGATIONS AND RESULTS

During the FSS of Survey Unit 8110 areas                                                                                                                         with a +3 sigma/alarms were investigated. Thirty-five judgmental samples were  collected for investigation, all with radiological                                                  concentrations below the OpDCGL.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA
: 10.                                                           REMEDIATION AND RESULTS

No radiological remedial action as described by MARSSIM Section 5.4 was performed in  Survey Unit 8110 prior to or as a result of the FSS. Chapter 4 of the LTP                                                                                                                           determined that remediation beyond that required to meet the release criteria is unnecessary and the remaining residual radioactivity in soil was ALARA.
: 11.                                                           CHANGES FROM THE FINAL STATUS SURVEY PLAN

There were no addendums to the FSS plan.
: 12.                                                          DATA QUALITY ASSESSMENT

The DQO sample design and data were reviewed in accordance with  FCSD-RA-                                                                  LT-304,                                                           Final Status Survey Data Assessment (Reference 14) for completeness and consistency.
Documentation was complete and legible. Surveys and the collection of samples            were consistent with the DQOs and were sufficient to ensure that the survey unit was properly designated as Class
: 3. The survey design had adequate power as indicated by the retrospective power                        curve (see , Figure 16-4).
The measurement results indicated that all sampleswere less than a SOF of                                                     1 when compared to the OpDCGLs.
Although MARSSIM states that the Sign Test need not be performed in the instance that no measurements surpass the OpDCGL, the test was conducted to demonstrate ad            herence to the statistical principles of the DQO process. The Sign Test was performed on the data and compared to the original assumptions of the DQOs. The evaluation of the Sign Test results clearly demonstrates that Survey Unit 8110 passes the unrestricted release criteria, thus, the null hypothesis is rejected. The results of the Sign Test are presented in Attachment              3.
The preliminary data review consisted of calculating basic statistical quantities (e.g., mean, median, standard deviation). All data was considered valid including negative values, zeros, and values reported below the MDC. The mean and median values for each ROC were well below the respective OpDCGLs. Also, the retrospective power curve shows that  enough samples were collected to achieve the desired power  ; therefore, Survey Unit 8110 meets the unrestricted release criteria with adequate power as required by the DQOs.
The mean of all identified isotopes is less than the Consultation Triggers for Residential Soil Concentration depicted in Table H.1 of NUREG 1757, Vol.1, Rev. 2 (Memorandum of Understanding Table 1). The full table is included in Attachment 5 of this release record.

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The data for Cs-137 is                                                                                     presented graphically through a                                                                                     frequency plot and quantile plot. All graphical presentations are provided in Attachment                                     6.
: 13.                                                           ANOMALIES

No anomalies were observed during the performance or analyses of the survey.
: 14.                                                           CONCLUSION

Survey Unit 8110has met the DQOs of the FSS plan. The ALARA criteria as specified in Chapter 4 of the LTP were achieved. The elevated measurement comparison for soils was not applicable and remediation was not required.
All identified ROC were used for statistical testing to determine the adequacy of    Survey Unit 8110 for FSS. Evaluation of the data shows that none of the random ROC concentration values exceeds the OpDCGLs; therefore, in accordance with LTP Section 5 .2.6, the survey unit meets the release criteria.
The sample data passed the Sign Test. The null hypothesis was rejected. The  retrospective power curve showed that adequate power was achieved.             Survey Unit 8110 is properly classified as Class 3.
The dose contribution from soil in Survey Unit 8110 is                                                                                     0.5449 mrem/yr TEDE, based on the average concentration of the ROC in samples used for nonparametric                       statisticaltesting                         .
Survey Unit 8110is acceptable                                                                                                                                  for unrestricted release.
: 15.                                                           REFERENCES
: 1.                                                           FCSD-RA-LT-305, Final Status Survey Data Reporting
: 2.                                                           Fort Calhoun Station Decommissioning Project License Termination Plan
: 3.                                                           FCSD-RA-LT-302, Final Status Survey Sample Plan Development
: 4.                                                           NUREG-1575, Revision 1,                                   Multi-Agency Radiation Survey and Site Investigation Manual
: 5.                                                           TSD 20-001, Historical Site Assessment for Fort Calhoun Station
: 6.                                                           TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan
: 7.                                                           NUREG-1757, Volume 2, Revision 2,                                    Consolidated Decommissioning Guidance -
Characterization, Survey, and Determination of Radiological Criteria  

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA
: 8.                                                           FCSD-RA-LT-100, Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station
: 9.                                                           FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors
: 10.                                                           FCSD-RA-LT-205,                                                           Chain-of-Custody Protocol for Site Characterization and Final Status Survey
: 11.                                                           FCSD-RA-LT-203,                                                           Sample Media Collection for Site Characterization and Final Status Survey
: 12.                                                           FCSD-RA-LT-204,                                                           Sample Media Preparation for Site Characterization and Final Status Survey
: 13.                                                           NUREG-1576,                                   Multi-Agency Radiological Laboratory Analytical Protocols Manual
: 14.                                                           FCSD-RA-LT-304,                                                           Final Status Survey Data Assessment
: 16.                                                           ATTACHMENTS

Attachment 1 - Figure Attachment 2 - Scan Data Attachment 3 - Sign Test Attachment 4 - Quality Control Assessment Attachment 5 - Consultation Triggers for Residential Soil                                                                          Concentrations Attachment 6 - Graphical Presentations

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH                                OWNER CONTROLLED AREA

ATTACHMENT 1 - FIGURES

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Figure 16 Survey Unit 8110 Scan Locations Map

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ATTACHMENT 2 - SCAN DATA

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Table 16 Survey Unit                                                                        8110 Complete Scan Data Min       Max Detector    Detector      M3001       Survey     Loca-      Scan       Scan         Avg         Action      Scan Type          ID           ID         Unit       tion     Logged    Logged     Background       Level    Alarms?
Result     Result       (cpm)        (cpm)      (Y/N)
(cpm)     (cpm) 44-20     PR404738     20521210       8110         1       18027     22000        20180        21420        Y 44-20     PR404738     20521210       8110         2       19652     22600        20180        21420        Y 44-20     PR404738     20521210       8110         3       14056     23200        20180        21420        Y 44-20     PR404738     20521210       8110         4       12613     25600        20180        21420        Y 44-20     PR404738     20521210       8110         5       17546     21800        20180        21420        Y 44-20     PR404738     20521210       8110         6       19291     23000        20180        21420        Y 44-20     PR404738     20521210       8110         7       12373     21600        20180        21420        Y 44-20     PR404738     20521210       8110         8       15440     21000        20180        21420        N 44-20     PR404738     20521210       8110         9       17365     21000        20180        21420        N 44-20     PR404738     20521210       8110        10       19953     20700        20180        21420        N 44-20     PR404738     20521210       8110        11       18990     23200        20180        21420        Y 44-20     PR404738     20521210       8110        12       17546     24200        20180        21420        Y 44-20     PR404738     20521210       8110        13       20675     25900        20180        21420        Y 44-20     PR404738     20521210       8110        14       17666     23000        20180        21420        Y 44-20     PR397732     25021209       8110        15                 23400 44-20     PR397732     25021209       8110        16                 23500 44-20     PR397732     25021209       8110        17                 24100 44-20     PR397732     25021209       8110        18                 24700 44-20     PR397732     25021209       8110        19                 23400 44-20     PR397732     25021209       8110        20                 24000 44-20     PR397732     25021209       8110        21                 23200 44-20     PR397732     25021209       8110        22                 24400 44-20     PR397732     25021209       8110        23                 24600 44-20     PR397732     25021209       8110        24                 24900 44-20     PR397732     25021209       8110        25                 33100 44-20     PR397732     25021209       8110        26                 24400 44-20     PR397732     25021209       8110        27                 24900 44-20     PR397732     25021209       8110        28                 25900 44-20     PR397732     25021209       8110        29                 24700 44-20     PR397732     25021209       8110        30                 23600 44-20     PR397732     25021209       8110        31                 23600 44-20     PR397732     25021209       8110        32                 23300 44-20     PR397732     25021209       8110        33                 27900 44-20     PR397732     25021209       8110        34                 26900 44-20     PR397732     25021209       8110        35                 24400 44-20     PR397732     25021209       8110        36                 24300 44-20     PR397732     25021209       8110        37                 24600 44-20     PR397204     25021208       8110        38                 22400 44-20     PR397204     25021208       8110        39                 23000 44-20     PR397204     25021208       8110        40                 23900

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8110 NORTH OWNER CONTROLLED AREA

Min          Max Detector       Detector          M3001          Survey         Loca-         Scan         Scan              Avg           Action         Scan Type             ID               ID            Unit          tion       Logged        Logged       Background           Level       Alarms?
Result       Result           (cpm)            (cpm)         (Y/N)
(cpm)         (cpm) 44-20       PR397204         25021208           8110           41                       24000 44-20       PR397204         25021208           8110           42                       25800 44-20       PR397204         25021208           8110           43                       23900 44-20       PR397204         25021208           8110           44                       24800 44-20       PR397204         25021208           8110           45                       22000 44-20       PR397204         25021208           8110           46                       22800 44-20       PR397204         25021208           8110           47                       22700 44-20       PR397204         25021208           8110           48                       24700 44-20       PR397204         25021208           8110           49                       24200 44-20       PR397203         25021217           8110         GW 1         12921         34990           22340            23645           Y 44-20       PR397204         25021208           8110        GW 10         17434         27882           21580            22862           Y 44-20       PR397203         25021217           8110        GW 11          9971         40979           20960            22224           Y 44-20       PR397204         25021208           8110        GW 12         17733         27721           22400            23706           Y 44-20       PR403795         25021219           8110        GW 13         12090         25334           20040            21276           Y 44-20       PR404738         25021210           8110        GW 14         10960         25555           20400            21657           Y 44-20       PR404738         25021210           8110         GW 2          9968         27604           21940            23233           Y 44-20       PR397204         25021208           8110         GW 3         18144         23945           20940            22203           Y 44-20       PR403795         25021219           8110         GW 4         14839         30877           22660            23974           Y 44-20       PR397204         25021208           8110         GW 5         13039         25472           21980            23274           Y 44-20       PR397204         25021208           8110         GW 6         13400         29359           23760            25105           Y 44-20       PR403795         25021219           8110         GW 7         10630         24091           21360            22636           Y 44-20       PR404738         25021210           8110         GW 8         10028         29412           20940            22203           Y 44-20       PR397203         25021217           8110         GW 9         11711         36994           20760            22018           Y 44-20                                                                                                                                   PR404738                                            25021210                                                                                8110 QC 18027                                                                          30136                                                                                                                         22320                                                                                                                   23624                                                                                                                    Y GW 10 Areas above three                                                     standard deviations were scanned for verification of original scans prior to judgmental sample collection.

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ATTACHMENT 3 - SIGN TEST

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Table 16 Survey Unit 8110  Sign Test
                                  #           SOF           1-Ws           Sign (Ws) 1         0.13199          0.87           +1 2         0.09528          0.90           +1 3         0.00548          0.99           +1 4         0.08251          0.92           +1 5         0.06123          0.94           +1 6         0.12698          0.87           +1 7         0.01567          0.98           +1 8         0.27591          0.72           +1 9         0.02330          0.98           +1 10         0.00000          1.00           +1 11         0.03598          0.96           +1 12         0.15305          0.85           +1 13         0.06594          0.93           +1 14         0.01455          0.99           +1 Number of positive     differences (S+)                         14

Critical Value         10

Survey Unit               Meets the Acceptance Criteria

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ATTACHMENT 4 - QUALITY CONTROL ASSESSMENT

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Table 16 Survey Unit 8110 QC Assessment 6XUYH\\ $UHM                                               6XUYH\\ 8QLW                                 6XUYH\\ 8QLW 1MPH                                                                                                                       1RUWK  2RQHU  &RQWUROOHG  $UHM

Sample Plan #:                                             8110-F

Sample

== Description:==
Comparison of split samples collected from surface soil samples from location #4 were analyzed using gamma spectroscopy by on-site HPGe System.

Standard ID                 Activity Value        Standard Error        Activity Value          Standard                        $EVROXWH          53'             Trending           $FFHSWMEOH" (Standard)                                (Comparison)             Error                         'LIIHUHQFH                       Assessment?
8110X-3-FR-GSSA-004                                                               6.46E-02                                                                                3.87E-02                                                                                       1.11E-01                                                                 2.93E-02                                   8.78E-02                                     4.64E-02                                                                  N/A                                                                                                                               Y                                                                                                                                                               Y Guidanc e from  Sec t ion C.4.2.2 of MAR LAP

UBGR (Cs-137 OpDCGL) = 3.65 pCi /g LBGR (Mean Cs-137Activity) = 0.0559 pCi/g Wi d th  o f th e Gra y Regi o n  ( ) = 3.5941 p Ci /g M a x Sta n d a rd  Un certa i n ty (&#xb5;M R) =  /10 = 0.3594 p Ci /g Comments/Corrective Actions:  Both samples reported Cs-137 as a detect. There was acceptable agreement between the sample results. No further                                                                                Max Relative Standard Uncertainty (MR) = 0.0985 action is necessary.                                                                                                       Avera ge Co n cen tra ti o n  o f th e two  mea su red  resu l ts < UBGR:
Warning Limit = 2.83 &#xb5;MR = 1.0171 pCi/g Control Limit = 4.24 &#xb5;MR = 1.5239 pCi/g Avera ge Co n cen tra ti o n  o f th e two  mea su red  resu l ts > UBGR:
Warning Limit = 2.83 MR x 100% = 27.87%
Control Limit = 4.24 MR x 100% = 41.75%

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ATTACHMENT 5 - CONSULTATION TRIGGERS FOR RESIDENTIAL SOIL CONCENTRATION

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ATTACHMENT 6 - GRAPHICAL PRESENTATIONS

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Figure 16 Quantile Plot for Cs                                                -137 Concentration Quantile Plot For Cs                                                                                          -137

1.80E-01

1.60E-01

1.40E-01

1.20E-01

1.00E-01

8.00E-02

6.00E-02

4.00E-02

2.00E-02

0.00E+00 0%                                                                                              10%                                                                                    20%                                                                                    30%                                                                                    40%                                                                                    50%                                                                                    60%                                                                                    70%                                                                                    80%                                                                                    90%                                                                          100%

PERCENTAGE

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Figure 16 Histogram for Cs                                                -137 Concentration Frequency Plot For Cs                                                                                                                                                -137

10 9
8 7
6 5
4 3
2 1
0 2.78E-02                                                                                                                                                5.57E-02                                                                                                                                                8.35E-02                                                                                                                                                1.11E-01                                                                                                                                                1.39E-01                                                                                                                                                1.67E-01

UPPER END VALUE (PCI/G)

FSS RELEASE RECORD -                                                               REVISION 0 SURVEY UNIT 8110 NORTH OWNER CONTROLLED AREA

Figure 16 Retrospective Power Curve for                                                 Survey Unit 8110

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FORT CALHOUN STATION FINAL STATUS SURVEY RELEASE RECORD

SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

REVISION 0

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

PREPARED BY / DATE:
M. Uz, LT/FSS Specialist

REVIEWED      BY / DATE:
M. Bryant, LT/FSS  Specialist

REVIEWED      BY / DATE:
A. Barker Regulatory Assurance & Emergency Planning Manager

REVIEWED      BY / DATE:
D. Whisler Manager Radiation Protection & Chemistry

APPROVED BY / DATE:
B. Bishop, LT/FSS Manager

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FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

TABLE OF CONTENTS
: 1.                                                                              EXECUTIVE 

==SUMMARY==
...................................................................................................................                                                                                    8
: 2.                                                                              SURVEY UNIT DESCRIPTION ........................................................................................................ 8
: 3.                                                                              CLASSIFICATION BASIS .................................................................................................................. 8
: 4.                                                                              DATA QUALITY OBJECTIVES ..................................................................................................... 10
: 5.                                                                              SURVEY DESIGN .............................................................................................................................. 13
: 6.                                                                              SURVEY IMPLEMENTATION....................................................................................................... 18
: 7.                                                                              SURVEY RESULTS ........................................................................................................................... 19
: 8.                                                                              QUALITY CONTROL ....................................................................................................................... 51
: 9.                                                                              INVESTIGATIONS AND RESULTS ............................................................................................... 51
: 10.                                                                              REMEDIATION AND RESULTS .................................................................................................... 51
: 11.                                                                              CHANGES FROM THE FINAL STATUS SURVEY PLAN ......................................................... 51
: 12.                                                                              DATA QUALITY ASSESSMENT .................................................................................................... 51
: 13.                                                                              ANOMALIES ...................................................................................................................................... 52
: 14.                                                                              CONCLUSION ................................................................................................................................... 52
: 15.                                                                              REFERENCES .................................................................................................................................... 53
: 16.                                                                              ATTACHMENTS ...............................................................................................................................53

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LIST OF TABLES

Table 3 Statistical Quantities for Cs-137 and Co-                      60 from the Characterization Survey of 8202    .................... 9 Table 3 Off-Site Analysis for Characterization Samples in 8202   ....................................................................... 9 Table 4 Base Case DCGLs for Soil .....................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           12 Table 4 Operational DCGLs for Soil  ..................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             13 Table 5 Action Levels for Survey Unit 8202  .......................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              14 Table 5 Random Sample Locations                                    ....................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 15 Table 5 Judgmental Sample Locations ...............................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               15 Table 5 Investigation Levels ................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          17 Table 5 Synopsis of Survey Design  ......................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     17 Table 7 Synopsis of Scan Results ........................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         19 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Samples Comprising the Statistical Sample Population ...........................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       41 Table 7 Basic Statistical Properties of Random Sample Population and Survey Unit Dose ..........................                                                                                                                                                                                                                                                                      43 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples ....                                        44 Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples ..................                                                                                                                                                                                     50 Table 16-                                        1 - Survey Unit 8202 Complete Scan Data  ...............................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             59 Table 16-                                        2 - Survey Unit 8202 Sign Test  ..................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             62 Table 16-                                        3 - Survey Unit 8202 QC Assessment  .......................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              64

LIST OF FIGURES

Figure 7 Survey Unit 8202 Northeast Field GPS Scan Results .........................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                21 Figure 7 Survey Unit 8202 Northeast Field Z -Score Map ................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      22 Figure 7 Survey Unit 8202 Northeast Field Z -Score and Sample Locations Map (22-30) .............................                                                                                                                                                                                                                                                                                                    23 Figure 7 Survey Unit 8202 Northeast Field Z -Score and Sample Locations Map (32-41) .............................                                                                                                                                                                                                                                                                                                    24 Figure 7 Survey Unit 8202 Southeast Field GPS Scan Results .........................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                25 Figure 7 Survey Unit 8202 Southeast Field Z-Score Map .................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                26 Figure 7 Survey Unit 8202 Southeast Field Z-Score and Sample Locations Map (20 & 21)   .........................                                                                                                                                                                                                                                                            27 Figure 7-8 -- Survey Unit 8202 Southeast Field Z-                        Score and Sample Locations Map (51-                                          53) .............................                                                                                                                                                                                                                                                                                                    28 Figure 7 Survey Unit 8202 Southeast Field Z-Score and Sample Locations Map (57)   ...................................                                                                                                                                                                                                                                                                                                                                                                29 Figure 7 Survey Unit 8202 Center East Field GPS Scan Results ...................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   30 Figure 7 Survey Unit 8202 Center East Field Z-Score Map ...........................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    31 Figure 7-12 --                           Survey Unit 8202 Center East Field Z-Score and Sample Locations Map (15-                                          19) .......................                                                                                                                                                                                                                                       32 Figure 7 Survey Unit 8202 Northwest Field GPS Scan Results ......................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 33 Figure 7 Survey Unit 8202 Northwest Field Z -Score Map..............................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  34 Figure 7 Survey Unit 8202 Northwest Field Z -Score and Sample Locations Map (42-                                          50) ...........................                                                                                                                                                                                                                                                                                35 Figure 7 Survey Unit 8202 Middle Field GPS Scan Results ...........................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    36 Figure 7 Survey Unit 8202 Middle Field Z-Score Map ...................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    37 Figure 7-18 --                           Survey Unit 8202 Middle Field Z-Score and Sample Locations Map (54-                                          56) ...............................                                                                                                                                                                                                                                                                                                                        38 Figure 7 Survey Unit 8202 Southeast Field QC GPS Scan Results ................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     39 Figure 7 Survey Unit 8202 Southeast Field QC Z-                        Score and Sample Locations Map (54-                                          56) ....................                                                                                                                                                                                                         40 Figure 16 Survey Unit 8202 Scan Locations Map  ..............................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   56

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Figure 16 Survey Unit 8202 Random and Judgmental Sample Locations Map     .............................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                     57 Figure 16 Quantile Plot for Cs-137 Concentration  ............................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               68 Figure 16 Histogram for Cs -137 Concentration ................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       69 Figure 16 Retrospective Power Curve for Survey Unit 8202 ............................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              70

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LIST OF ABBREVIATIONS delta
/                                                                                                                                                                                                   relative shift sigma ALARA                                                                                                                                                  as low as is reasonably achievable BcDCGL                                                                                             base case derived concentration guideline level BcSOF                                                                                                                                      base case sum of fractions cpm                                                                                                                                                                                       counts per minute DQA                                                                                                                                                                 data quality assessment DQO                                                                                                                                                                 data quality objective DCGL                                                                                                                                       derived concentration guideline level DCGLW                                                                                                                    derived concentration guideline level wide area FCS                                                                                                                                                                                    Fort Calhoun Station FSS                                                                                                                                                                                         final status survey GPS                                                                                                                                                                                  Global Positioning System HTD                                                                                                                                                                       hard-to-detect IC                                                                                                                                                                                                                          insignificant contributor LBGR                                                                                                                                         lower bound of the gray region LT/FSS                                                                                                                            License Termination/Final Status Survey LTP                                                                                                                                                                                    license termination plan m                                                                                                                                                                                                                                    meter MARSSIM                                                       Multi-Agency Radiation Survey and Site Investigation Manual MDC                                                                                                                                                            minimum detectable concentration mrem/yr                                                                                                               millirem per year NaI                                                                                                                                                                                                  sodium iodide NRC                                                                                                                                                                       Nuclear Regulatory Commission OpDCGL                                                                                       operational derived concentration guideline level

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FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

pCi/g                                                                                                                                                               picocuries per gram QAPP                                                                                                                                               quality assurance project plan QC                                                                                                                                                                                                       quality control ROC                                                                                                                                                                       radionuclides of concern SOF                                                                                                                                                                                  sum of fractions TEDE                                                                                                                                                                            total effective dose equivalent TSD                                                                                                                                                                               technical support document UBGR                                                                                                                                      upper bound of the gray region VSP                                                                                                                                                                       Visual Sample Plan

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FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA
: 1.                                                          EXECUTIVE 

==SUMMARY==

This final status survey (F                                   SS) release record for                                    Survey Unit 8202, West Owner Controlled Area, has been generated in accordance with procedure                                    FCSD-RA-LT-305,                                                           Final Status Survey Data Reporting (Reference            1) and satisfies the requirements of Section 5.7.1 of the Fort Calhoun Station Decommissioning Project License Termination Plan  (FCS            ; LTP            ; Reference            2).
An FSS sample plan for this survey unit was developed in accordance with          procedure FCSD           -RA-LT-302,                                                           Final Status Survey Sample Plan                                    Development            (Reference            3), the                                                FCS             LTP            , and with guidance from NUREG-1575, Revision 1,                                               Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM            ; Reference            4).
Survey Unit 8202, an                                                                                                            open land survey unit, has a MARSSIM classification of                       3. A survey plan was designed based upon use of the Sign Test as the nonparametric statistical test for compliance             .
Both the Type I () and Type II () decision error rates were set at 0.05         . As a                        random sample population, 14 soil samples were acquired from the survey unit. In addition, soil scanning was performed on 10% of the total surface area in the survey unit. The analytical results for all  soil samples taken in Survey Unit 8202 indicate that the                                                                                                                         maximum sum of f                                                 ractions (SOF)           ,
considering the concentration of all applicable radionuclides of            concern (ROC), is                                    equal to 0.2972 when applying the respective operational                                    derived concentration guideline levels (OpDCGLs) for soil. Therefore, the null hypothesis is rejected and Survey Unit 8202 is acceptable for unrestricted release. The mean SOF when applying the respective base                                    case derived concentration guideline levels (BcDCGL) for soil is             0.0418. This SOF equates to a dose for the survey unit of 1.0442 milliremper year (mrem/yr).
: 2.                                                            SURVEY UNIT DESCRIPTION

Survey Unit 8202 is a                                                                                                                       n impacted Class 3 open land survey unit. The                        surfacearea of the survey unit is 54,169 meters (m)2.
The boundary of the survey unit and the location of the soil samples were defined using a Global Positioning System (GPS). Refer to                        Attachment 1 of this report for a figure depicting Survey Unit 8202.
: 3.                                                          CLASSIFICATION BASIS

Survey Unit 8202 was identified in                                                                                                                         the technical support document (TSD) 20-001, Historical Site Assessment for Fort Calhoun Station  (Reference5) as a Class                                                                                         3 survey unit. The initial site characterization surveys were conducted between November 2019 and July 2020. The                                                                                                                                                            following summarizes the results of the characterization survey for Survey Unit 8202.

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FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

In total, eight surface soil sample            s were collected in           Survey Unit 8202. All samples                                                                                                                                     from Survey Unit 8202 were analyzed by the on                                                                                                                      -site gamma spectroscopy system. Cs            -137 was detected at concentrations above minimum detectable                        concentration (MDC)                                                            in five                                    of the samples, at a maximum concentration of 2.11E-01 picocuries per gram (                                                          pCi/g). Co                        -60 was not detected at concentrations above MDC in any of the surface soil samples                                 . A summary of the analyses for surface soil samples            taken during site characterization are presented in                                  Table            3-1.
Two surface soil            samples were sent to           GEL Laboratories for off-site analysis of the initial             suite of radionuclides. A summary of the off-site analyses is presented in Table 3-2.

Table 3 Statistical Quantities for Cs                                                                      -137 and Co-60 from the Characterization Survey of 8202 Surface Soil                                                                                                        Co-60                                                   Cs-137
                                                                                                                                                                                            # of Samples                                                                                                                                                                                                                                                                                                                              8
                                                                                                                                                                                                      # >MDC                                                                                                                                                                                                                                                           0                                                                                                                                                                          5 Mean (pCi/g)                                                                                                                                                       1.38E-02                                          1.50E-01 Median (pCi/g)                                                                                                                                        7.27E-03                                          1.39E-01 Max (pCi/g)                                                                                                                                                                6.76E-02                                          2.11E-01 Min (pCi/g)                                                                                                                                                               0.00E+00                                     8.24E-02 Standard Deviation (pCi/g)                                          2.28E-02                                          4.58E-02

Table 3 Off-                                                                                                       Site Analysis for Characterization Samples           in 8202 Radionuclide                                                                       8200X-3-CJ-GSSX-029                                                                                                                    8200X-3-CR-                                                         GSSX-026 Am-241                                                                                                                                                                                                                       2.31E-02                                                                                                                                                                                                                                                                                                                  1.12E-02 Sb-125                                                                                                                                                                                                                           0.00E+00                                                                                                                                                                                                                                                                                                              4.25E-02 C-14                                                                                                                                                                                                                                                                                          6.90E-01                                                                                                                                                                                                                                                                                                                  4.23E-01 Ce-144                                                                                                                                                                                                                               1.52E-01                                                                                                                                                                                                                                                                                                                  6.57E-02 Cs-                                         134                                                                                                                                                                                                                                                                                        0.00E+00                                                                                                                                                                                                                                                                                                              9.33E-02 Cs-                                         137                                                                                                                                                                                                                                                                                           2.38E-01                                                                                                                                                                                                                                                                                                                2.28E-01 Co-57                                                                                                                                                                                                                                   0.00E+00                                                                                                                                                                                                                                                                                                              3.40E-03 Co-58                                                                                                                                                                                                                                   0.00E+00                                                                                                                                                                                                                                                                                                         0.00E+00 Co-60                                                                                                                                                                                                                                       2.63E-02                                                                                                                                                                                                                                                                                                                  1.45E-02 Cm-242                                                                                                                                                                                                                   0.00E+00                                                                                                                                                                                                                                                                                                         0.00E+00 Cm-243/244                                                                                                                                                                                     1.72E-02                                                                                                                                                                                                                                                                                                                  1.99E-02 Eu-152                                                                                                                                                                                                                                                                      3.34E-02                                                                                                                                                                                                                                                                                                                  2.83E-02 Eu-154                                                                                                                                                                                                                                                                      9.98E-03                                                                                                                                                                                                                                                                                                              0.00E+00 Eu-155                                                                                                                                                                                                                                                                      5.20E-02                                                                                                                                                                                                                                                                                                                  9.41E-02 Fe-55                                                                                                                                                                                                                                           7.30E-01                                                                                                                                                                                                                                                                                                              0.00E+00

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FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Radionuclide                                           8200X-3-CJ-GSSX-029                                                                       8200X-3-CR-                                                         GSSX-026 Mn-54                                                                                                                                                                                                                              0.00E+00                                                                                                                                                                                                                                                                                                              6.24E-02 Np-237                                                                                                                                                                                                                            6.96E-04                                                                                                                                                                                                                                                                                                              0.00E+00 Ni-59                                                                                                                                                                                                                                      0.00E+00                                                                                                                                                                                                                                                                                                         0.00E+00 Ni-63                                                                                                                                                                                                                                      0.00E+00                                                                                                                                                                                                                                                                                                         0.00E+00 Nb-94                                                                                                                                                                                                                                  0.00E+00                                                                                                                                                                                                                                                                                                              3.08E-02 Pu-238                                                                                                                                                                                                                           0.00E+00                                                                                                                                                                                                                                                                                                         0.00E+00 Pu-239/240                                                                                                                                                                                            2.22E-02                                                                                                                                                                                                                                                                                                                  2.75E-02 Pu-241                                                                                                                                                                                                                           0.00E+00                                                                                                                                                                                                                                                                                                         1.55E+00 Ag-110m                                                                                                                                                                                                             4.84E-03                                                                                                                                                                                                                                                                                                                  1.98E-02 Sr-90                                                                                                                                                                                                                                             7.88E-02                                                                                                                                                                                                                                                                                                                  1.06E-03 Tc-99                                                                                                                                                                                                                                     0.00E+00                                                                                                                                                                                                                                                                                                         0.00E+00 H-3                                                                                                                                                                                                                                                     0.00E+00                                                                                                                                                                                                                                                                                                         0.00E+00 Zn-65                                                                                                                                                                                                                                        4.35E-02                                                                                                                                                                                                                                                                                                              0.00E+00 Note: Bold values indicate concentration greater than MDC. Unbolded values indicate the value below MDC. All values in pCi/g.

Based upon a                                                                                                                                                review of the historical information, the results of the characterization survey data, and completion of a Survey Unit Classification Worksheet, the correct final classification of Survey Unit 8202 was determined to be Class                                                                                                                       3.
: 4.                                                          DATA QUALITY  OBJECTIVES

FSS planning and design relies                                                            on a properly executed                                                                       data                                    quality                         objective                        (DQO) process to ensure, through compliance with explicitly defined inputs and boundaries, that the primary objective of the survey is satisfied . The DQO process                       , utilized in accordance with MARSSIM, is described in the FCS LTP            . The appropriate design for a given survey was                                     developed using the DQO process as outlined in Appendix D of MARSSIM                                   . A summary of the seven steps of the DQO process are outlined in the following paragraphs.
The DQO process incorporated hypothesis testing and probabilistic sampling distributions to control decision errors during data analysis. Hypothesis testing is a process based on the scientific method that compares a baseline condition to an alternate condition. The baseline condition is technically known as the null hypothesis. Hypothesis testing rests on the premise that the null hypothesis is true and sufficient evidence must be provided to reject it in favor of the alternative hypothesis. In designing the survey plan, the underlying assumption, or null hypothesis was that residual activity in the survey unit exceeded the release criteria. Rejection of the null hypothesis would indicate that residual activity within the survey unit does not exceed the release criteria.
Therefore, the survey unit would satisfy the primary objective of the FSS sample            plan.

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FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

The primary objective of the FSS sample plan is to demonstrate that the level of residual radioactivity in Survey Unit 8202 did not exceed the release criteria specified in the LTP and that the potential dose from residual radioactivity is  as low as is reasonably achievable (ALARA).
TSD 21-043,Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan (Reference            6)                        establishes the basis for an initial suite of potential ROC              s for decommissioning. LTP Chapter 2 provides detailed characterization data that describes                                                                 the results of surveys completed            of soil. Surface samples were taken in each impacted open land survey unit and analyzed for the presence of plant-derived radionuclides. The results of surface soil characterization in the impacted area surrounding FCS indicate that there is minimal residual radioactivity in soil.
Insignificant contributors (ICs) were determined consistent with the guidance contained in Section 3.3 of NUREG-1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance
- Characterization                                   , Survey, and Determination of Radiological Criteria (Reference            7). For soil, the ROCs were found to be Cs-137, Co-60, Eu-152, and C-14. The remaining radionuclides were designated as IC and were eliminated from further detailed evaluation.
Section 5.2.6 of the LTP states that each radionuclide specific B         cDCGL is equivalent to the level of residual radioactivity (above background levels) that could, when considered independently, result in a total effective dose equivalent (TEDE) of 25 mrem/yr to an Average Member of the Critical Group. To ensure that the summation of dose from each source term is 25 mrem/yr or less after all FSS is completed, the  BcDCGLs are reduced based on an expected, or a priori, fraction of the 25 mrem/yr dose limit from each source term. The reduced DCGLs          (i.e., OpDCGLs                       ) can be related to the BcDCGLs as an expected fraction of dose based on an a priori                                     assessment of what the expected dose should be based on the results of site characterization, process knowledge, and the extent of planned remediation. The OpDCGL is then used as the DCGL for the FSS design of the survey unit (e.g., calculation of surrogate DCGLs or, investigation levels). Details of the OpDCGLs derived for each dose component and the basis for the applied a priori                                     dose fractions are provided in Section 5.2.6 of the LTP.
Multiple ROCs are known to be present at FCS. The dose contribution from each ROC is accounted for using the SOF to ensure that the total dose from all ROC does not exceed the dose criterion. A BcDCGL that is established for the average residual radioactivity in a survey unit is equivalent to a derived concentration guideline level wide area (DCGLW) as defined in MARSSIM.
At FCS, compliance is demonstrated through the summation of dose from seven            distinct source terms (i.e., basements, soils, buried pipe, embedded pipe, above-ground structures, basement fill, and groundwater) for the end            state. When applied to soil, the DCGLs are expressed in units of activity per unit of mass             (pCi/g).

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FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

For FCS, soil is             defined as a layer of soil beginning at the surface but extending to a depth of 1 m to allow for flexibility in compliance demonstration if contamination deeper than 0.15 m is encountered. Based on characterization data and historical information, there are no expectations of encountering a source term geometry that is comprised of a clean surface layer of soil over a contaminated subsurface soil layer. Section 6.9 of the LTP provides the exposure scenarios and modeling parameters that were used to calculate the site                  -specific soil DCGLs. The adjusted soil DCGLs for the unrestricted release of open land survey units as provided in the Section                                    6.16 of the LTP are pre                                                                    sented in Table 4-1. The IC dose percentage of                                              5% was used to adjust the DCGLs in Table                                    4-1 to account for the dose from the eliminated IC radionuclides.

Table 4 Base Case DCGLs                                                                        for Soil Surface Soil                  Subsurface Radionuclide                    BcDCGL                  Soil BcDCGL (pCi/g)                     (pCi/g)
C-14                                                                                                                                                                                       5.70E+01                                                                                                            9.68E+00 Co-60                                                                                                                                    3.77E+00                                                                                                            2.93E+00 Cs-                                         137                                                                                                                                                                                         1.31E+01                                                                                                            7.27E+00 Eu-152                                                                                                                                                                   8.41E+00                                                                                                            7.36E+00

The reduced DCGLs, OpDCGLs, are calculated using           Equation 5-1 from Chapter 5 of the LTP, shown below.

Equation 4 OpDCGL Calculation

The OpDCGLs for the unrestricted release of          soil are provided in Table                                    4-2.

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FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Table 4 Operational DCGLs                                                                         for Soil Surface Soil               Subsurface Soil Radionuclide                 OpDCGL                        OpDCGL (pCi/g)                       (pCi/g)
C-14                                                                                                                                                                                       1.59E+01                                                                                                                                          2.71E+00 Co-60                                                                                                                                         1.06E-00                                                                                                                                                    8.21E-01 Cs-                                         137                                                                                                                                                                                         3.65E+00                                                                                                                                               2.04E-00 Eu-152                                                                                                                                                                   2.36E+00                                                                                                                                               2.06E-00

Instrument DQOs included a verification of the ability of the survey instrument to detect the radiations of interest relative to the OpDCGL . Survey instrument response checks were required prior to issuance and after the instrument had been used. Control and accountability of survey instruments was required to assure the quality and prevent the loss of data.
As part of the DQOs applied to laboratory processes, analysis results were reported as actual calculated results. The actual                        reported value was used as the recorded FSS result for measurement and sample values that are less than MDC. Negative values were recorded as zero                    . Results were not reported as less than MDC. Sample report summaries included unique sample identification, analytical method, radionuclide, result, uncertainty, laboratory data qualifiers, units, and the observed MDC.
In accordance with the LTP, for laboratory analysis, MDCs less than 10% of the OpDCGL            were preferable while MDCs up to 50% of the OpDCGL were                                  acceptable. The                                             minimum acceptable MDC for measurements obtained using field instruments was             50% of the applicable OpDCGL                       .
: 5.                                                            SURVEY DESIGN

The level of effort associated with planning a survey is based on the complexity of the survey and nature of the hazards. Guidance for preparing FSS plans is provided in procedure FCSD-RA-LT-302, Final Status Survey Sample Plan                                    Development (Reference3).
The DQO process validated that Co-60, Cs                                                                        -137, Eu                                                                       -152, and C-14 would be the ROC            s in Survey Unit 8202 as presented in LTP Section                                                                                                                       5.2.5. As discussed in LTP Section 5.2.6.2, instead of inferring the concentrations for the hard to detect (          HTD) ROC                                               C-14 using a surrogate approach, 100% of all samples collected in the survey unit were sent for off-site analysis for C-14.
The action levels for Survey Unit 8202 sample results                                                                                                                         are based on 50% of the            Table            4-2 OpDCGLs and are                                                            presented in Table                                    5-1.

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FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Table 5 Action Levels for                                                                        Survey Unit 8202 ROC                          Action Level (pCi/g)
Co-60                                                                                                                                                                                                                                                    5.30E-01 Cs-                                         137                                                                                                                                                                                                                                                                                                    1.83E+00 Eu-152                                                                                                                                                                                                                                                                              1.18E+00 C-14                                                                                                                                                                                                                                                                                                  7.95E+00

The Sign Test was selected as the nonparametric statistical test to demonstrate compliance with the release criteria. The use of the Sign Test did not require the selection or use of a background reference area, which simplified survey design and implementation. This approach was conservative since it included background Cs-137 as part of the sample set.
The number of soil samples for FSS was determined in accordance with procedure FCSD-RA-LT-302 (Reference                                                                                                                                              3). The relative shift (/) for the survey unit data set is defined as shift (),
which is the upper boundary of the gray                                    region (UBGR), or the DCGL (SOF of 1), minus the lower bound of the gray region (LBGR)                                                            , divided by sigma (), which is the standard deviation of the data set used for survey design. The optimal value for / should range between 1 and 3. The largest value the / can have is 3. If the calculated value of / exceeds 3, an adjusted           value of            3 will be used for /. The / for Survey Unit 8202, based                                                on the data for surface soil samples collected during the characterization of            Survey Unit 8202, was calculated as follows:

Equation 5 Relative Shift
                                                                        =                (1                 0.0592)=               27.3 0.0345

As the calculated / was greater than 3, a value of 3 was used as the adjusted /. Both the Type I error (i.e.,              value            ) and the Type II error (i.e.,  value) wereset at 0.05. The sample size from Table 5.5 of MARSSIM that equates to the Type I and Type II error of 0.05 for use with the Sign Test is an N value of 14.
A prospective                        power                         curve was generated using           MARSSIM Power 2000, a software package developed under the sponsorship of the United States Nuclear Regulatory Commission (NRC) for implementation of the MARSSIM in support of the decommissioning license termination rule (10 CFR 20, Subpart E). The result of the MARSSIM Power 2000 computer run showed adequate power for the survey design.
Given that the survey unit is Class             3, sample locations were selected                                              randomly. The                                                random locations of the soil samples were selected using Visual Sample Plan (VSP)        , in accordance with

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FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

FCSD-RA-LT-302 (Reference                                                                                                                                              3). Input parameters included use of aerial photographs and             the random sampling tool set with a predetermined number (14) of samples. The                        random coordinates generated with the VSP were integrated with a GPS to identify sample locations in the field.
Table 5-2lists the                                     random samples collected for FSS and the corresponding GPS coordinates, based on the Nebraska State Plan          e North American Datum 1983 coordinate system.

Table 5 Random Sample Locations Sample ID                                            Northing                             Easting 8202X-3-FR-GSSX-001                                                                                                                            194127.234                                                          825915.230 8202X-3-FR-GSSX-002                                                                                                                            194132.089                                                          825941.117 8202X-3-FR-GSSX-003                                                                                                                            194138.282                                                          825967.726 8202X-3-FR-GSSX-004                                                                                                                            194149.332                                                          826005.210 8202X-3-FR-GSSX-005                                                                                                                            194077.519                                                          826052.031 8202X-3-FR-GSSX-006                                                                                                                            194088.566                                                          826072.717 8202X-3-FR-GSSX-007                                                                                                                            194107.478                                                          826014.168 8202X-3-FR-GSSX-008                                                                                                                            194138.258                                                          826068.243 8202X-3-FR-GSSX-009                                                                                                                            194155.211                                                          826209.681 8202X-3-FR-GSSX-010                                                                                                                            194060.032                                                          826024.632 8202X-3-FR-GSSA-011                                                                                                                            194168.663                                                          826184.269 8202X-3-FR-GSSX-012                                                                                                                            194186.280                                                                               826261.416 8202X-3-FR-GSSX-013                                                                                                                            194187.111                                                          826282.901 8202X-3-FR-GSSX-014                                                                                                                            194112.607                                                          826301.122

In accordance with the sample plan, at least one judgmental sample is required from the survey unit. The number of judgmental samples collected            was            43, which brings the total number of samples collected for the FSS of Survey Unit 8202 to 57. Table                                                                                                            5-3lists the                                     judgmental samples collected for FSS and the corresponding GPS coordinates.

Table 5 Judgmental Sample Locations Sample ID                                          Northing                            Easting 8202X-3-FJ-GSSX-015                                                          194142.744                                                     826019.016 8202X-3-FJ-GSSX-016                                                          194143.068                                                     826020.869 8202X-3-FJ-GSSX-017                                                          194120.386                                                     826004.894 8202X-3-FJ-GSSX-018                                                          194118.128                                                     826020.374 8202X-3-FJ-GSSX-019                                                          194123.581                                                     826009.469 8202X-3-FJ-GSSX-020                                                          194103.506                                                     826037.493 8202X-3-FJ-GSSX-021                                                          194103.672                                                     826036.048 8202X-3-FJ-GSSX-022                                                          194146.389                                                     825998.700

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FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Sample ID                                                  Northing                                   Easting 8202X-3-FJ-GSSX-023                                                          194137.773                                                     825986.349 8202X-3-FJ-GSSX-024                                                          194136.751                                                     825986.136 8202X-3-FJ-GSSX-025                                                          194134.709                                                     825985.819 8202X-3-FJ-GSSX-026                                                          194142.965                                                     825999.377 8202X-3-FJ-GSSX-027                                                          194135.529                                                     825985.937 8202X-3-FJ-GSSX-028                                                          194141.801                                                     825999.173 8202X-3-FJ-GSSX-029                                                          194141.462                                                     825992.074 8202X-3-FJ-GSSX-030                                                          194147.173                                                     825992.694 8202X-3-FJ-GSSA-031                                                          194137.445                                                     825991.238 8202X-3-FJ-GSSX-032                                                          194140.297                                                     825988.648 8202X-3-FJ-GSSX-033                                                          194142.150                                                                           826004.206 8202X-3-FJ-GSSX-034                                                          194130.269                                                     825987.675 8202X-3-FJ-GSSX-035                                                          194139.303                                                     825998.346 8202X-3-FJ-GSSX-036                                                          194139.377                                                     825994.282 8202X-3-FJ-GSSX-037                                                          194144.964                                                     826005.872 8202X-3-FJ-GSSX-038                                                          194142.598                                                     825986.936 8202X-3-FJ-GSSX-039                                                          194144.108                                                     825989.286 8202X-3-FJ-GSSX-040                                                          194146.709                                                     825994.379 8202X-3-FJ-GSSX-041                                                          194145.518                                                     826001.010 8202X-3-FJ-GSSX-042                                                          194095.851                                                     825973.829 8202X-3-FJ-GSSX-043                                                          194121.705                                                     825970.573 8202X-3-FJ-GSSX-044                                                          194120.824                                                     825971.029 8202X-3-FJ-GSSX-045                                                          194109.503                                                     825985.667 8202X-3-FJ-GSSX-046                                                          194097.421                                                     825972.567 8202X-3-FJ-GSSX-047                                                          194114.507                                                     825963.146 8202X-3-FJ-GSSX-048                                                          194115.453                                                     825968.500 8202X-3-FJ-GSSX-049                                                          194097.981                                                     825979.765 8202X-3-FJ-GSSX-050                                                          194115.187                                                     825971.933 8202X-3-FJ-GSSX-051                                                          194102.480                                                                           826036.387 8202X-3-FJ-GSSX-052                                                          194127.218                                                     826051.255 8202X-3-FJ-GSSX-053                                                          194143.714                                                     826049.064 8202X-3-FJ-GSSX-054                                                          194132.509                                                               826029.07 8202X-3-FJ-GSSX-055                                                          194123.719                                                     826028.317 8202X-3-FJ-GSSX-056                                                          194105.452                                                     826024.069 8202X-3-FJ-GSSA-057                                                          194076.508                                                     826035.192

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FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

The implementation of quality control (QC) measures as r   eferenced by S   ection 5.6.3 of the LTP and FCSD-RA-LT-100, Quality A ssurance Project P  lan    for the License Termination P lan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station (QAPP; Reference 8) includes the  collection of a s oil sample f or split sample a nalysis on   5% of the soil samples t aken in a survey unit with the locations selected at random. Seven s oil samples, 8202X-3-FQ-GSSX-008, 8202X-3-FR-GSSB-011, 8202X-3-FQ-GSSX-026, 8202X-3-FJ-GSSB-031, 8202X-3-FQ-GSSX-043, 8202X-3-FQ-GSSX-053, and 8202X-3-FJ-GSSB-057, were designated    for split or  duplicate sample QC   analysis for the FSS of this survey unit.
Section 5.3.4 and Table 5-20 of the LTP        specify t hat for Class  3 open land survey units, surface scans will be  performed    on a judgmental percentage of the surface area in the survey unit. For Survey Unit 8202, 10% scan cov     erage w as s   elected, which equals  5,417 m2.
For this Class 3 open land survey unit, the Investigation Levels for area scanning and soil sample measurement results ar e those levels s pecified i   n t he Table 5-24 of the LTP and are reproduced below in Table 5-5.

Table 5 Investigation Levels Classification                                                   Scan Investigation Levels                                                               Direct Investigation Levels

Class 3                                                                                                                                                                         >Operational DCGL or >MDCscan if MDCscan isgreater than Operational DCGL                                                                                                                                                                                                                                                                                      >0.5 Operational DCGL

Table 5-6 provides a synopsis of the survey design for                                    Survey Unit 8202.

Table 5 Synopsis of Survey Design Feature                                                       Design Criteria                                                                    Basis

Survey Unit  Surface Area                                                                                                                                                                                                                                                                            54,169 m2                                                                                                                                                                                                                                                                                                                                                                                                                                                      GPS

Number of Random Samples                                                                         14                                                                                                                                                                         *                                   / = 3 (adjusted)
(N)
* MARSSIM Table 5.5
* Co-60:                       1.06                                         pCi/g
* Cs-                                         137: 3.65 pCi/gOperational DCGLs for surface DCGLs
* Eu-152: 2.36 pCi/g                       soil, LTP, Table 5                    -8
* C-14: 15.9 pCi/g Scan and Direct Investigation                                                                                                                                       Table 5                    -24 Levels                                                                                                                                                                                                                                                                                                                                                                                                                                      Table 5-4                                                                                                                                                                                                                                                                                                                                                           LTP, Scan Areal Coverage                                                                                                                                                              5417 m 2, 10% areal coverage                                                                                                                                                                                           LTP, Table 5-20 Judgmental Samples                                                                                                                                                                                                                                                                                                                                                                                               1 Per Survey Design 43                                               Actual Number Obtained

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Feature                             Design Criteria                                Basis

HTD                             ROC Analysis                                                                                                                                                                                                                                                                                                                                                             100% LTP, Section 5.2.6.2 57                        Number of Samples Analyzed 1 duplicate and                                          1 split sample LTP, Section 5.6.3 QC                              selected at random                   Actual Number Obtained 7
: 6.                                                            SURVEY IMPLEMENTATION

For Survey Unit 8202, compliance with the unrestricted release criteria was demonstrated through a combination of soil scanning with a Ludlum Model 44-20 gamma detector                                                            and the sampling of soil for isotopic analysis.
A License Termination/Final Status Survey (LT/                                    FSS) Supervisor performed a visual inspection and walk-down of the survey unit on December                                                                        15, 2021, prior to performing FSS. The purpose of the walk-down was to assess the physical condition of the survey unit, evaluate access points and travel paths, and identify potentially hazardous conditions. At the time of survey, the soil in the survey unit was dry and free of any considerable constraint for the collection of samples and scan measurements.
FSS field activities were conducted under the FSS            sample plan                         and             included DQOs, survey design, detailed FSS instructions, job safety analysis, and related procedures for reference. FSS field activities were projected to take  10 working days to complete. Daily briefings were conducted to discuss the expectations for job performance and to review the safety aspects of the job. A Field Log                                                                        was used to document field activities and other information pertaining to the performance of the FSS. FSS field activities commenced on                           January 4, 2022, and concluded on January 12, 2022.
A total of five            different scan areas           were scanned using a Ludlum Model 3001 paired with a Ludlum Model 44-20 (3 x 3) sodium iodide (NaI) detector and Trimble GPS unit. The background was established as the average of five one-                 minute static measurements, while maintaining the detector 6 from the soil. In Survey Unit 8202, background ranged from 28,160 counts per minute (cpm) up to 29,720 cpm.
All designated scan areas were scanned using the Model 44-20 detector operated in the rate-                                          meter mode and using audio response. The probe was positioned no more than 2 from the ground and was moved at a scan speed of approximately 0.25 m per second. In accordance with FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors                                                           (Reference 9), scan MDC was sufficient to detect residual radioactivity at the action level. Complete scan results are provided in Attachment 2.

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The 14 random sample locations were marked with flags          based on GPS coordinates provided.
Each soil sample consisted of approximately 1 liter of soil. The                        soil sample media was sifted to remove stones and other media larger than 1 centimeter in diameter. All soil samples were collected, controlled, transported, stored, and transferred to the on-site laboratory using the chain-of-custody process from                                                                                    FCSD-RA-LT-205, Chain-of-Custody Protocol for Site Characterization and Final Status Survey (Reference            10)                                               , and in accordance with FCSD-RA-LT-203, Sample Media Collection for Site Characterization and Final Status Survey (           Reference 11) and FCSD                                                           -RA-LT-204, Sample Media Preparation for Site Characterization and Final Status Survey (Reference 12).
The survey design specified that 100%                                                                                    of the samples w                                ere required for the                                 HTD ROC analysis.
In total, 57 samples were selected for HTD radionuclide analysis.
The implementation of survey specific QC measures included the collection of seven            (7)            samples (8202X-3-FQ-GSSX-008, 8202X-3-FR-GSSB-011, 8202X-3-FQ-GSSX-026, 8202X-3-FJ-GSSB-031, 8202X-3-FQ-GSSX-043, 8202X-3-FQ-GSSX-053, and 8202X-3-FJ-GSSB-057) for split or duplicate sample analysis.
: 7.                                                            SURVEY RESULTS

All areas identified in the FSS  sample plan were scanned for elevated activity levels.            The 5,417 m2 scan requirement was achieved by scanning five areas         (Northeast Field, Southeast Field, Center East Field, Northwest Field, Middle Field)  within             accessible land. Figure 16-1presents the scan areas within the unit. Judgmental samples did not have an Action Level, as the readings were taken to verify the readings identified in the Z-Score analysis. Table                                             7-1 provides an overview of the scan results for all 1 m2 scan areas around each sample location and the gamma walkovers.
Complete scan results are provided in Attachment                                     2, Table                                                            16-1.

Table 7 Synopsis of Scan Results

Min Scan           Max Scan             Action              Scan Scan Area             Logged             Logged              Level           Alarms?           Judgmental Reading            Reading              (cpm)             (Y/N)              Samples (cpm)              (cpm) 1                26288              29100              29625                N                    0 2                27699              31500              29625                Y                    0 3                28042              31100              29625                Y                    0 4                27440              31200              29625                Y                    0 5                26579              30700              29625                Y                    0 6                27952              31200              29625                Y                    0

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Min Scan                         Max Scan                             Action                             Scan Scan Area                             Logged                           Logged                              Level                       Alarms?                          Judgmental Reading                          Reading                             (cpm)                            (Y/N)                            Samples (cpm)                            (cpm) 7                            27374                            30800                            29625                                Y                                    0 8                            27500                            31600                            29625                                Y                                    0 9                            26624                            33100                            29625                                Y                                    0 10                             28039                            31600                            29625                                Y                                    0 11                             26820                            32100                            30938                                Y                                    0 12                             24952                            32300                            30938                                Y                                    0 13                             25555                            30300                            30938                                N                                    0 14                             26880                            34200                            30938                                Y                                    0 15                             25225                            28500                            31225                                N                                    0 16                             25225                            29400                            31225                                N                                    0 17                             25225                            28600                            31225                                N                                    0 18                             25225                            29000                            31225                                N                                    0 19                             25225                            29400                            31225                                N                                    0 20                             25225                            28800                            31225                                N                                    0 21                             25225                            29700                            31225                                N                                    0 Center E                              25225                                                                                                                                                             35183                                                                                                                                                           30650                                                                                                                                                                                           Y                                                                                                                                                                                                                                                                                5 Field Middle                              23539                            31059                            29973                                Y                                    3 NE Field                              26181                            47514                            30343                                Y                                   20 NW Field                               25544                            38562                            29666                                Y                                    9 SE Field                              23861                           132729                            31143                                Y                                    6 SE Field QC                               24771                            33574                            30548                                Y                                    0

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For the Survey Unit 8202 Northeast Field, count rates ranged between 26,181 cpm and 47,514 cpm, with a mean count rate of 29,827 cpm and a standard deviation of 1,269 cpm. Figure 7-1 below presents a map of the gamma walkover for Survey Unit 8202 Northeast Field.

Figure 7 Survey Unit 8202 Northeast Field                                                                                                                        GPS Scan Results

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An evaluation of the Survey Unit 8202 Northeast Field data set was performed to                                                                                                                      assessthe                                                  small areas of elevated activity which exceeded three standard deviations above the mean measurement (i.e., +3 Z-Score). Twenty locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-2 through                        Figure 7-4 below present maps of the +3 Z-Score                      measurements within the Northeast Field  and             the selected biased sampling locations.

Figure 7 Survey Unit 8202 Northeast Field                                                                                                                       Z-ScoreMap

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Figure 7 Survey Unit 8202 Northeast Field                                                                                                                       Z-Scoreand                                                       Sample Locations Map (22            -30)

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Figure 7 Survey Unit 8202 Northeast Field                                                                                                                       Z-Score and Sample                                                      Locations Map             (32            -41)

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For the            Survey Unit 8202 Southeast Field, count rates ranged between 23,861 cpm and 132,729 cpm, with a mean count rate of 30,087 cpm and a standard deviation of 2,699 cpm. The 132,729 cpm value is believed to be due to a bumped detector since it was only one reading and could not be replicated. Figure 7-5 below presents a map of the gamma walkover for Survey Unit 8202 Southeast Field.

Figure 7 Survey Unit 8202 Southeast Field GPS Scan Results

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An evaluation of the Survey Unit 8202 Southeast Field data set was performed to                                                                                                                      assessthe                                                  small areas of elevated activity which exceeded three standard deviations above the mean measurement.
Six locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-6 through                         Figure 7-9 below present map                                    s of the +3            Z-Score measurements within the Survey Unit 8202 Southeast Field                        and             the selected biased sampling locations.

Figure 7 Survey Unit 8202 Southeast Field                                                                                                                         Z-ScoreMap

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Figure 7 Survey Unit 8202 Southeast Field                                                                                                                         Z-Scoreand                                                       Sample Locations Map             (20 &
21)

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Figure 7-8 -- Survey Unit 8202 Southeast Field                                                                                                                         Z-Scoreand                                                       Sample Locations Map (51-53)

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Figure 7 Survey Unit 8202 Southeast Field                                                                                                                         Z-Scoreand                                                       Sample Locations Map             (57)

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For the Survey Unit 8202 Center East Field, count rates ranged between 25,225 cpm and 35,183 cpm, with a mean count rate of 29,532 cpm and a standard deviation of 1,009 cpm. Figure 7-10 below presents a map of the gamma walkover for the Center East Field.

Figure 7 Survey Unit 8202 Center East Field GPS Scan Results

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An evaluation of the            Survey Unit 8202 Center East                                                                                                                        Field data set was performed to          assessthe small areas of elevated activity which exceeded three standard deviations above the mean measurement. Five locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-11and                                                            Figure 7-12 below present maps of the +3 Z-Scoremeasurements within                                  the Survey Unit 8202 Center East Field and the selected biased sampling locations.

Figure 7 Survey Unit 8202 Center East Field                                                                                                                       Z-ScoreMap

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Figure 7-12 -- Survey Unit 8202 Center East Field                                                                                                                       Z-Score and Sample                                                       Locations Map             (15            -
19)

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For the Survey Unit 8202 Northwest Field, count rates ranged between 25,544 cpm and 38,562 cpm, with a mean count rate of 28,692 cpm and a standard deviation of 851 cpm. Figure 7-13 below presents a map of the gamma walkover for the Northwest Field.

Figure 7 Survey Unit 8202 Northwest Field GPS Scan Results

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An evaluation of the Survey Unit 8202 Northwest Field data set was performed to                                                                                                                      assessthe small areas of elevated activity which exceeded three standard deviations above the mean measurement. Nine locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-14and                                                             Figure 7-15 below present maps of the +3 Z-Scoremeasurements within                                  the Survey Unit 8202 Northwest Field and the selected biased sampling locations.

Figure 7 Survey Unit 8202 Northwest Field                                                                                                                        Z-ScoreMap

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Figure 7 Survey Unit 8202 Northwest Field                                                                                                                        Z-Scoreand Sample                                                       Locations Map             (42            -50)

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For the Survey Unit 8202 Middle Field, count rates ranged between 23,539 cpm and 31,059 cpm, with a mean count rate of 26,886 cpm and a standard deviation of 1,193 cpm.                                                                                                                                    Figure 7-16below presents a map of the gamma walkover for the Middle Field.

Figure 7 Survey Unit 8202 Middle Field GPS Scan Results

29,973

29,973

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An evaluation of the Survey Unit 8202 Middle Field data set was performed to                                                                                                                      assessthe                                                  small areas of elevated activity which exceeded three standard deviations above the mean measurement.
Three locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-17 and                                                 Figure 7-18 below present maps of the +3 Z-Score measurements within the Survey Unit 8202 Middle Field and the selected biased sampling locations.

Figure 7 Survey Unit 8202 Middle Field                                                                                                                         Z-ScoreMap

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Figure 7-18 -- Survey Unit 8202 Middle Field                                                                                                                         Z-Score and Sample                                                       Locations Map             (54            -56)

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For the Survey Unit 8202 Southeast Field QC, count rates ranged between 24,771 cpm and 33,574 cpm, with a mean count rate of 2                                                                                                                                             9,401 cpm and a standard deviation of 1,331 cpm. Figure 7-19 below presents a map of the gamma walkover for the Southeast Field QC.

Figure 7 Survey Unit 8202 Southeast Field QC                                                                                                                         GPS Scan Results

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An evaluation of the Survey Unit 8202 Southeast Field QC data set was performed to assess the small areas of elevated activity which exceeded three standard deviations above the mean measurement. No locations were selected for biased sample collection based on evaluation of the gamma walkover data. Figure 7-20below present                                                           s a            map of the +3 Z-Score measurements within the Survey Unit 8202 Southeast Field QC.

Figure 7 Survey Unit 8202 Southeast Field QC                                                                                                                         Z-Score and Sample Locations Map (54-56)

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The on-site laboratory analyzed the 14 soil samples taken for nonparametric statistical testing using the on-site gamma spectroscopy system. A summary of the results             for the 14 samples collected for nonparametric statistical testing is provided in   Table 7-2. Gamma spectroscopy results revealed that             Cs-137 was positively identified             in             11 random samples            . No other ROCs were positively identified. The off-site laboratory, GEL Laboratories, analyzed the 14 random samples for the HTD ROC C-14. C-14 was not detected in any of the 14 random samples. The maximum operational                        sum of fractions (OpSOF) for random samples is 0.2802.
The basic statistics for the  random sample population, as compared to the BcDCGLs, and the survey unit dose aresummarized in                                              Table 7-3.
The SOF or unity rule is the mathematical test used to   assesscompliance with radiological criteria for license termination when more than one radionuclide has been determined to be potentially present. The equation for the unity rule is:

Equation 7 Unity Rule C1                                                                                                                                                                                                                                                                                      +                                                                                                                                                                                                                                                                                                         DCGLC2+............Cn1 DCGL1              DCGL2                                  n Where:                                                                                                                                                                                                               Cn                                                                                                                                                             =                                  concentration of radionuclide n DCGLn                                                          =                                  DCGL of radionuclide n.

Table 7 Summary of Gamma Spectroscopy Results and             OpSOF Calculations for Samples Comprising the Statistical Sample Population

Activity              OpDCGL                     Fraction Sample ID                            ROC              (pCi/g)                 (pCi/g)                       of               OpSOF OpDCGL

Co-60          8.82E-03                1.06E+00                  8.32E-03 8202X-3-FR-GSSX-001                             Cs-137          3.52E-01                3.65E+00                  9.64E-02                0.2038 Eu-152          2.23E-01                2.36E+00                  9.45E-02 C-14          7.22E-02                1.59E+01                  4.54E-03 Co-60          2.16E-01                1.06E+00                  2.04E-01 Cs-137          1.20E-01                3.65E+00                  3.29E-02 8202X-3-FR-GSSX-002                             Eu-152          0.00E+00                2.36E+00                 0.00E+00                 0.2448

C-14                                                         1.29E-01                                                                 1.59E+01                                                                       8.11E-03

8202X-3-FR-GSSX-003                              Co-60          4.82E-02                1.06E+00                  4.55E-02                0.0849 Cs-137          1.23E-01                3.65E+00                  3.37E-02

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Activity    OpDCGL         Fraction Sample ID            ROC      (pCi/g)       (pCi/g)         of       OpSOF OpDCGL

Eu-152   0.00E+00      2.36E+00     0.00E+00 C-14    9.14E-02      1.59E+01      5.75E-03 Co-60   4.39E-02      1.06E+00      4.14E-02 8202X-3-FR-GSSX-004       Cs-137   2.69E-01      3.65E+00      7.37E-02     0.1205 Eu-152   0.00E+00      2.36E+00     0.00E+00 C-14    8.58E-02      1.59E+01      5.40E-03 Co-60   0.00E+00      1.06E+00     0.00E+00 8202X-3-FR-GSSX-005       Cs-137   1.10E-01      3.65E+00      3.01E-02     0.0362 Eu-152   0.00E+00      2.36E+00     0.00E+00 C-14    9.71E-02      1.59E+01      6.11E-03 Co-60   0.00E+00      1.06E+00     0.00E+00 8202X-3-FR-GSSX-006       Cs-137   1.89E-01      3.65E+00      5.18E-02     0.0560 Eu-152   0.00E+00      2.36E+00     0.00E+00 C-14    6.76E-02      1.59E+01      4.25E-03 Co-60   1.19E-01      1.06E+00      1.12E-01 8202X-3-FR-GSSX-007       Cs-137   6.15E-02      3.65E+00      1.68E-02     0.1699 Eu-152   9.63E-02      2.36E+00      4.08E-02 C-14    0.00E+00      1.59E+01     0.00E+00 Co-60   8.74E-02      1.06E+00      8.25E-02 8202X-3-FR-GSSX-008       Cs-137   1.28E-01      3.65E+00      3.51E-02     0.1279 Eu-152   0.00E+00      2.36E+00     0.00E+00 C-14    1.65E-01      1.59E+01      1.04E-02 Co-60   1.14E-01      1.06E+00      1.08E-01 8202X-3-FR-GSSX-009       Cs-137   8.36E-02      3.65E+00      2.29E-02     0.1331 Eu-152   0.00E+00      2.36E+00     0.00E+00 C-14    4.19E-02      1.59E+01      2.64E-03 Co-60   4.55E-02      1.06E+00      4.29E-02 8202X-3-FR-GSSX-010       Cs-137   1.52E-01      3.65E+00      4.16E-02     0.1495 Eu-152   1.43E-01      2.36E+00      6.06E-02 C-14    6.82E-02      1.59E+01      4.29E-03 Co-60   8.36E-02      1.06E+00      7.89E-02 Cs-137   4.61E-01      3.65E+00      1.26E-01 8202X-3-FR-GSSA-011       Eu-152   7.32E-02      2.36E+00      3.10E-02     0.2449 C-14                                                         1.38E-01                                                                 1.59E+01                                                                       8.68E-03 8202X-3-FR-GSSX-012        Co-60   4.85E-02      1.06E+00      4.58E-02     0.2802 Cs-137   3.53E-01      3.65E+00      9.67E-02

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Activity                 OpDCGL                        Fraction Sample ID                                ROC                (pCi/g)                    (pCi/g)                           of                OpSOF OpDCGL

Eu-152             2.91E-01                  2.36E+00                    1.23E-01 C-14             2.29E-01                  1.59E+01                    1.44E-02 Co-60             1.14E-01                  1.06E+00                    1.08E-01 8202X-3-FR-GSSX-013                                  Cs-137             2.12E-01                  3.65E+00                    5.81E-02                    0.1708 Eu-152            0.00E+00                   2.36E+00                    0.00E+00 C-14             8.20E-02                  1.59E+01                    5.16E-03 Co-60             5.21E-02                  1.06E+00                    4.92E-02 8202X-3-FR-GSSX-014                                  Cs-137             5.83E-02                  3.65E+00                    1.60E-02                    0.0651 Eu-152            0.00E+00                   2.36E+00                    0.00E+00 C-14            0.00E+00                   1.59E+01                    0.00E+00 Note: Bold values indicate concentrations greater than MDC.

Table 7 Basic Statistical Properties of                                                                       Random Sample Population and Survey Unit Dose Mean                Median                    Max                   Min               Std. Dev.                BcDCGL                   Avg BcSOF                     Avg Dose ROC                                                                                                                                                            per ROC                     per ROC (pCi/g)               (pCi/g)               (pCi/g)                (pCi/g)               (pCi/g)                  (pCi/g)

Co-60                                                  7.01E-02                                         5.03E-02                                           2.16E-01                                      0.00E+00                                     5.83E-02                                                                 3.77E+00                                                                                            1.86E-02                                                                                                 4.65E-01

Cs-137                                          1.91E-01                                         1.40E-01                                           4.61E-01                                           5.83E-02                                           1.24E-01                                                                 1.31E+01                                                                                            1.46E-02                                                                                                 3.64E-01

Eu-152                                         5.90E-02                                    0.00E+00                                     2.91E-01                                      0.00E+00                                     9.64E-02                                                                 8.41E+00                                                                                            7.02E-03                                                                                                 1.75E-01

C-14                                                             9.05E-02                                         8.39E-02                                           2.29E-01                                      0.00E+00                                     6.12E-02                                                                 5.70E+01                                                                                            1.59E-03                                                                                                 3.97E-02

Mean base case sum of fractions ( BcSOF) =           0.0418

DOSE ASSIGNED TO SURVEY UNIT =1.0442 mrem/yr

The on-site laboratory analyzed the 43 judgmental soil samples            using the on-site gamma spectroscopy system. A summary of the analytical results for the judgmental soil samples is provided in Table                                    7-4. Gamma spectroscopy results revealed                                              that Cs            -137 was positively identified in 28 judgmental samples. No other ROCs were positively identified            .

GEL Laboratories analyzed the 43 judgmental samples for the            HTD ROC C-14. C-14 was not detected in any of the 43 judgmental samples. The maximum OpSOF for judgmental samples is 0.2972.

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FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations             for Judgmental Samples Measured       OpDCGL           Fraction of Sample ID         ROC          Activity                                        OpSOF (pCi/g)         (pCi/g)        OpDCGL

Co-60        8.00E-02       1.06E+00         7.55E-02 8202X-3-FJ-GSSX-015    Cs-137       2.38E-01       3.65E+00         6.52E-02        0.1888 Eu-152       1.01E-01       2.36E+00         4.28E-02 C-14        8.47E-02       1.59E+01         5.33E-03 Co-60        4.88E-02       1.06E+00         4.60E-02 8202X-3-FJ-GSSX-016    Cs-137       1.29E-01       3.65E+00         3.53E-02        0.1670 Eu-152       1.87E-01       2.36E+00         7.92E-02 C-14        1.01E-01       1.59E+01         6.35E-03 Co-60        6.91E-02       1.06E+00         6.52E-02 8202X-3-FJ-GSSX-017    Cs-137       8.60E-02       3.65E+00         2.36E-02        0.1679 Eu-152       1.83E-01       2.36E+00         7.75E-02 C-14        2.57E-02       1.59E+01         1.62E-03 Co-60        9.69E-03       1.06E+00         9.14E-03 8202X-3-FJ-GSSX-018    Cs-137       1.15E-01       3.65E+00         3.15E-02        0.0406 Eu-152       0.00E+00       2.36E+00         0.00E+00 C-14        0.00E+00       1.59E+01         0.00E+00 Co-60        1.24E-01       1.06E+00         1.17E-01 8202X-3-FJ-GSSX-019    Cs-137       1.44E-01       3.65E+00         3.95E-02        0.1865 Eu-152       4.41E-02       2.36E+00         1.87E-02 C-14        1.81E-01       1.59E+01         1.14E-02 Co-60        2.11E-01       1.06E+00         1.99E-01 8202X-3-FJ-GSSX-020    Cs-137       7.42E-02       3.65E+00         2.03E-02        0.2531 Eu-152       6.36E-02       2.36E+00         2.69E-02 C-14        1.07E-01       1.59E+01         6.73E-03 Co-60        0.00E+00       1.06E+00         0.00E+00 8202X-3-FJ-GSSX-021    Cs-137       1.10E-01       3.65E+00         3.01E-02        0.0301 Eu-152       0.00E+00       2.36E+00         0.00E+00 C-14        0.00E+00       1.59E+01         0.00E+00 Co-60        2.20E-02       1.06E+00         2.08E-02 8202X-3-FJ-GSSX-022    Cs-137       2.48E-01       3.65E+00         6.79E-02        0.1438 Eu-152       1.30E-01       2.36E+00         5.51E-02 C-14        0.00E+00       1.59E+01         0.00E+00

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FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Measured                     OpDCGL Sample ID                        ROC                    Activity                                                Fraction of                     OpSOF (pCi/g)                     (pCi/g)                     OpDCGL

Co-60                  1.53E-01                   1.06E+00                       1.44E-01 8202X-3-FJ-GSSX-023                       Cs-137                  1.59E-01                   3.65E+00                       4.36E-02                       0.1879 Eu-152                 0.00E+00                    2.36E+00                       0.00E+00 C-14                 0.00E+00                    1.59E+01                       0.00E+00 Co-60                 0.00E+00                    1.06E+00                       0.00E+00 8202X-3-FJ-GSSX-024                       Cs-137                  1.08E-01                   3.65E+00                       2.96E-02                       0.0296 Eu-152                 0.00E+00                    2.36E+00                       0.00E+00 C-14                 0.00E+00                    1.59E+01                       0.00E+00 Co-60                 0.00E+00                    1.06E+00                       0.00E+00 8202X-3-FJ-GSSX-025                       Cs-137                  1.51E-01                   3.65E+00                       4.14E-02                       0.0414 Eu-152                 0.00E+00                    2.36E+00                       0.00E+00 C-14                 0.00E+00                    1.59E+01                       0.00E+00 Co-60                 0.00E+00                    1.06E+00                       0.00E+00 8202X-3-FJ-GSSX-026                       Cs-137                  1.59E-01                   3.65E+00                       4.08E-02                       0.1172 Eu-152                  1.67E-01                   2.36E+00                       7.08E-02 C-14                  8.97E-02                   1.59E+01                       5.64E-03 Co-60                  5.52E-02                   1.06E+00                       5.21E-02 8202X-3-FJ-GSSX-027                       Cs-137                  1.14E-01                   3.65E+00                       3.12E-02                       0.0833 Eu-152                 0.00E+00                    2.36E+00                       0.00E+00 C-14                 0.00E+00                    1.59E+01                       0.00E+00 Co-60                  2.34E-02                   1.06E+00                       2.21E-02 8202X-3-FJ-GSSX-028                       Cs-137                  1.11E-01                   3.65E+00                       3.04E-02                       0.0525 Eu-152                 0.00E+00                    2.36E+00                       0.00E+00 C-14                 0.00E+00                    1.59E+01                       0.00E+00 Co-60                  7.04E-02                   1.06E+00                       6.64E-02 Cs-137                  2.28E-01                   3.65E+00                       6.25E-02 8202X-3-FJ-GSSX-029                       Eu-152                  3.91E-01                   2.36E+00                       1.66E-01                       0.2946

C-14                                                                                                                                          0.00E+00                                                                                                                           1.59E+01                                                                                                                                                       0.00E+00

Co-60                                                                                                                                 0.00E+00                                                                                                                           1.06E+00                                                                                                                                                       0.00E+00 8202X-3-FJ-GSSX-030                       Cs-137                  2.26E-01                   3.65E+00                                                                                                                                                            6.19E-02 0.0619 Eu-152                 0.00E+00                    2.36E+00                       0.00E+00 C-14                                                                                                                                          0.00E+00                                                                                                                           1.59E+01                                                                                                                                                       0.00E+00

[45]
FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Measured                    OpDCGL Sample ID                        ROC                     Activity                                                Fraction of                     OpSOF (pCi/g)                      (pCi/g)                     OpDCGL

Co-60                  9.86E-02                    1.06E+00                       9.30E-02 8202X-3-FJ-GSSA-031                       Cs-137                  1.86E-01                    3.65E+00                       5.10E-02                       0.2554 Eu-152                  2.63E-01                    2.36E+00                       1.11E-01 C-14                  0.00E+00                    1.59E+01                       0.00E+00 Co-60                  8.14E-02                    1.06E+00                       7.68E-02 8202X-3-FJ-GSSX-032                       Cs-137                  1.06E-01                    3.65E+00                       2.90E-02                       0.1058 Eu-152                  0.00E+00                    2.36E+00                       0.00E+00 C-14                  0.00E+00                    1.59E+01                       0.00E+00 Co-60                  0.00E+00                    1.06E+00                       0.00E+00 8202X-3-FJ-GSSX-033                       Cs-137                  9.39E-02                    3.65E+00                       2.57E-02                       0.0257 Eu-152                  0.00E+00                    2.36E+00                       0.00E+00 C-14                  0.00E+00                    1.59E+01                       0.00E+00 Co-60                  0.00E+00                    1.06E+00                       0.00E+00 8202X-3-FJ-GSSX-034                       Cs-137                  9.69E-02                    3.65E+00                       2.65E-02                       0.0265 Eu-152                  0.00E+00                    2.36E+00                       0.00E+00 C-14                  0.00E+00                    1.59E+01                       0.00E+00 Co-60                  1.64E-02                    1.06E+00                       1.55E-02 8202X-3-FJ-GSSX-035                       Cs-137                  2.34E-01                    3.65E+00                       6.41E-02                       0.0796 Eu-152                  0.00E+00                    2.36E+00                       0.00E+00 C-14                  0.00E+00                    1.59E+01                       0.00E+00 Co-60                  0.00E+00                    1.06E+00                       0.00E+00 8202X-3-FJ-GSSX-036                       Cs-137                  1.28E-01                    3.65E+00                       3.51E-02                       0.0351 Eu-152                  0.00E+00                    2.36E+00                       0.00E+00 C-14                  0.00E+00                    1.59E+01                       0.00E+00 Co-60                  1.01E-01                    1.06E+00                       9.53E-02 Cs-137                  1.61E-01                    3.65E+00                       4.41E-02 8202X-3-FJ-GSSX-037                       Eu-152                  0.00E+00                    2.36E+00                       0.00E+00                       0.1394

C-14                                                                                                                                          0.00E+00                                                                                                                           1.59E+01                                                                                                                                                       0.00E+00

Co-60                                                                                                                                      4.50E-02                                                                                                                                 1.06E+00                                                                                                                                                            4.25E-02 8202X-3-FJ-GSSX-038                       Cs-137                  1.21E-01                    3.65E+00                                                                                                                                                            3.32E-02 0.0756 Eu-152                  0.00E+00                    2.36E+00                       0.00E+00 C-14                                                                                                                                          0.00E+00                                                                                                                           1.59E+01                                                                                                                                                       0.00E+00

[46]
FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Measured           OpDCGL Sample ID              ROC             Activity                               Fraction of           OpSOF (pCi/g)            (pCi/g)            OpDCGL

Co-60           2.67E-02           1.06E+00             2.52E-02 8202X-3-FJ-GSSX-039          Cs-137           8.91E-02           3.65E+00             2.44E-02             0.0533 Eu-152          0.00E+00            2.36E+00             0.00E+00 C-14            5.90E-02           1.59E+01             3.71E-03 Co-60           6.65E-02           1.06E+00             6.27E-02 8202X-3-FJ-GSSX-040          Cs-137           9.79E-02           3.65E+00             2.68E-02             0.1037 Eu-152          0.00E+00            2.36E+00             0.00E+00 C-14            2.25E-01           1.59E+01             1.42E-02 Co-60           8.99E-02           1.06E+00             8.48E-02 8202X-3-FJ-GSSX-041          Cs-137           8.87E-02           3.65E+00             2.43E-02             0.1205 Eu-152          0.00E+00            2.36E+00             0.00E+00 C-14            1.81E-01           1.59E+01             1.14E-02 Co-60           2.17E-02           1.06E+00             2.05E-02 8202X-3-FJ-GSSX-042          Cs-137           1.15E-01           3.65E+00             3.15E-02             0.0552 Eu-152          0.00E+00            2.36E+00             0.00E+00 C-14            5.11E-02           1.59E+01             3.21E-03 Co-60           7.07E-03           1.06E+00             6.67E-03 8202X-3-FJ-GSSX-043          Cs-137           1.12E-01           3.65E+00             3.07E-02             0.0523 Eu-152          0.00E+00            2.36E+00             0.00E+00 C-14            2.37E-01           1.59E+01             1.49E-02 Co-60           7.13E-02           1.06E+00             6.73E-02 8202X-3-FJ-GSSX-044          Cs-137           1.25E-01           3.65E+00             3.42E-02             0.1136 Eu-152          0.00E+00            2.36E+00             0.00E+00 C-14            1.93E-01           1.59E+01             1.21E-02 Co-60           8.68E-02           1.06E+00             8.19E-02 Cs-137           1.98E-01           3.65E+00             5.42E-02 8202X-3-FJ-GSSX-045          Eu-152          0.00E+00            2.36E+00             0.00E+00             0.1473

C-14                                                                                                                                               1.77E-01                                                                                                                                 1.59E+01                                                                                                                                                            1.11E-02

Co-60           1.32E-01           1.06E+00             1.25E-01 8202X-3-FJ-GSSX-046          Cs-137          0.00E+00            3.65E+00             0.00E+00             0.1270 Eu-152          0.00E+00            2.36E+00             0.00E+00 C-14            3.94E-02           1.59E+01             2.48E-03

[47]
FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Measured           OpDCGL Sample ID              ROC             Activity                               Fraction of          OpSOF (pCi/g)             (pCi/g)            OpDCGL

Co-60          0.00E+00            1.06E+00             0.00E+00 8202X-3-FJ-GSSX-047          Cs-137          7.09E-02            3.65E+00             1.94E-02             0.0211 Eu-152           3.90E-03           2.36E+00             1.65E-03 C-14           0.00E+00            1.59E+01             0.00E+00 Co-60           7.60E-02           1.06E+00             7.17E-02 8202X-3-FJ-GSSX-048          Cs-137          1.06E-01            3.65E+00             2.90E-02             0.1111 Eu-152          0.00E+00            2.36E+00             0.00E+00 C-14            1.64E-01           1.59E+01             1.03E-02 Co-60           1.58E-01           1.06E+00             1.49E-01 8202X-3-FJ-GSSX-049          Cs-137          1.46E-01            3.65E+00             4.00E-02             0.2972 Eu-152           2.16E-01           2.36E+00             9.15E-02 C-14            2.65E-01           1.59E+01             1.67E-02 Co-60          0.00E+00            1.06E+00             0.00E+00 8202X-3-FJ-GSSX-050          Cs-137           3.19E-01           3.65E+00             8.74E-02             0.0874 Eu-152          0.00E+00            2.36E+00             0.00E+00 C-14           0.00E+00            1.59E+01             0.00E+00 Co-60           7.11E-03           1.06E+00             6.71E-03 8202X-3-FJ-GSSX-051          Cs-137          1.67E-01            3.65E+00             4.58E-02             0.0925 Eu-152           9.45E-02           2.36E+00             4.00E-02 C-14           0.00E+00            1.59E+01             0.00E+00 Co-60           7.43E-02           1.06E+00             7.01E-02 8202X-3-FJ-GSSX-052          Cs-137           2.56E-01           3.65E+00             7.01E-02             0.1440 Eu-152          0.00E+00            2.36E+00             0.00E+00 C-14            6.07E-02           1.59E+01             3.82E-03 Co-60           9.35E-02           1.06E+00             8.82E-02 Cs-137          7.18E-02            3.65E+00             1.97E-02 8202X-3-FJ-GSSX-053          Eu-152          0.00E+00            2.36E+00             0.00E+00             0.1157

C-14                                                                                                                                               1.25E-01                                                                                                                                 1.59E+01                                                                                                                                                            7.86E-03

Co-60          0.00E+00            1.06E+00             0.00E+00 8202X-3-FJ-GSSX-054          Cs-137           9.22E-02           3.65E+00             2.53E-02             0.0253 Eu-152          0.00E+00            2.36E+00             0.00E+00 C-14           0.00E+00            1.59E+01             0.00E+00

[48]
FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Measured               OpDCGL Sample ID                  ROC                Activity                                     Fraction of              OpSOF (pCi/g)                (pCi/g)                OpDCGL

Co-60             1.88E-01               1.06E+00                 1.77E-01 8202X-3-FJ-GSSX-055               Cs-137             1.14E-01               3.65E+00                 3.12E-02                0.2086 Eu-152             0.00E+00               2.36E+00                0.00E+00 C-14             0.00E+00               1.59E+01                0.00E+00 Co-60             6.97E-04               1.06E+00                 6.58E-04 8202X-3-FJ-GSSX-056               Cs-137             4.37E-02               3.65E+00                 1.20E-02                0.0161 Eu-152             0.00E+00               2.36E+00                0.00E+00 C-14             5.56E-02               1.59E+01                 3.50E-03 Co-60             5.33E-03               1.06E+00                 5.03E-03 8202X-3-FJ-GSSA-057               Cs-137             1.98E-01               3.65E+00                 5.42E-02                0.0593 Eu-152             0.00E+00               2.36E+00                0.00E+00 C-14             0.00E+00               1.59E+01                0.00E+00 Note: Bold values indicate concentrations greater than MDC.

The implementation of survey specific QC measures included the collection of seven            (7)            samples (8202X-3-FQ-GSSX-008, 8202X-3-FR-GSSB-011, 8202X-3-FQ-GSSX-026, 8202X-3-FJ-GSSB-031, 8202X-3-FQ-GSSX-043, 8202X-3-FQ-GSSX-053, and 8202X-3-FJ-GSSB-057) for split or duplicate sample analysis.           The on-site laboratory analyzed the QC samples using the on-site gamma spectroscopy system. A summary of the analytical results for the QC sample             s is provided in Table                                    7-5. Gamma spectroscopy results revealed                                              that Cs            -137 was positively identified in five QC samples. No other ROC were positively identified in any QC sample. The maximum OpSOF for QC samples is 0.1529.

[49]
FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Table 7 Summary of Gamma Spectroscopy Results and OpSOF Calculations             for QC Samples

Sample ID                                                                                          ROC                                                           Activity                                                                   OpDCGL                                                                             Fraction of                                                                        OpSOF (pCi/g)                                                                        (pCi/g)                                                                         OpDCGL

Co-60                                                        1.08E-01                                                                                                                                                1.06E+00                                                                                                                                                                                    0.10189 8202X-3-FQ-GSSX-008                                                                                                         Cs-137                                                         1.86E-01                                                                       3.65E+00                                                                                                                                                                                    0.05096  0.15285 Eu-152                                                        0.00E+00                                                                                                                                            2.36E+00                                                                                                                                                                                    0.00000 C-14                                                     0.00E+00                                                                                                                                            1.59E+01                                                                                                                                                                                    0.00000 Co-60                                                       0.00E+00                                                                                                                                            1.06E+00                                                                                                                                                                                    0.00000 8202X-3-FR-GSSB-011                                                                                                         Cs-137                                                         5.42E-02                                                                                                                                               3.65E+00                                                                                                                                                                                    0.01485  0.01485 Eu-152                                                        0.00E+00                                                                                                                                            2.36E+00                                                                                                                                                                                    0.00000 C-14                                                     0.00E+00                                                                                                                                            1.59E+01                                                                                                                                                                                    0.00000 Co-60                                                       0.00E+00                                                                                                                                            1.06E+00                                                                                                                                                                                    0.00000 8202X-3-FQ-GSSX-026                                                                                                         Cs-137                                                         1.59E-01                                                                       3.65E+00                                                                                 0.04356                                                                    0.04480 Eu-152                                                         2.92E-03                                                                                                                                                2.36E+00                                                                                                                                                                                    0.00124 C-14                                                     0.00E+00                                                                        1.59E+01                                                                                 0.00000 Co-60                                                        5.40E-02                                                                                                                                                1.06E+00                                                                                                                                                                                    0.05094 8202X-3-FJ-GSSB-031                                                                                                       Cs-137                                                         1.64E-01                                                                                                                                                3.65E+00                                                                                                                                                                                    0.04493  0.09587 Eu-152                                                        0.00E+00                                                                                                                                            2.36E+00                                                                                                                                                                                    0.00000 C-14                                                     0.00E+00                                                                                                                                            1.59E+01                                                                                                                                                                                    0.00000 Co-60                                                       0.00E+00                                                                                                                                            1.06E+00                                                                                                                                                                                    0.00000 8202X-3-FQ-GSSX-043                                                                                                         Cs-137                                                         7.98E-02                                                                                                                                                3.65E+00                                                                                                                                                                                    0.02186  0.02186 Eu-152                                                        0.00E+00                                                                                                                                            2.36E+00                                                                                                                                                                                    0.00000 C-14                                                     0.00E+00                                                                                                                                            1.59E+01                                                                                                                                                                                    0.00000 Co-60                                                       0.00E+00                                                                                                                                            1.06E+00                                                                                                                                                                                    0.00000 8202X-3-FQ-GSSX-053                                                                                                         Cs-137                                                         1.82E-01                                                                                                                                               3.65E+00                                                                                                                                                                                    0.04986  0.04986 Eu-152                                                        0.00E+00                                                                        2.36E+00                                                                                 0.00000 C-14                                                     0.00E+00                                                                        1.59E+01                                                                                 0.00000 Co-60                                                        9.92E-02                                                                                                                                                1.06E+00                                                                                                                                                                                    0.09358 8202X-3-FJ-GSSB-057                                                                                                       Cs-137                                                         9.41E-02                                                                       3.65E+00                                                                                                                                                                                    0.02578  0.11937 Eu-152                                                        0.00E+00                                                                                                                                            2.36E+00                                                                                                                                                                                    0.00000 C-14                                                     0.00E+00                                                                                                                                            1.59E+01                                                                                                                                                                                    0.00000 Note: Bold values indicate concentrations greater than MDC.

[50]
FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA
: 8.                                                            QUALITY CONTROL

The on-site laboratory processed seven            split             and duplicate sample           s (8202X-3-FQ-GSSX-008, 8202X-3-FR-GSSB-011, 8202X-3-FQ-GSSX-026, 8202X-3-FJ-GSSB-031, 8202X-3-FQ-GSSX-043, 8202X-3-FQ-GSSX-053, and 8202X-3-FJ-GSSB-057)                                                                        using gamma spectroscopy analysis.
The data was evaluated using acceptance criteria specified in         NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual (Reference            13)                                                 as detailed in Section 5.6.3.2 of the LTP. There was acceptable agreement between standard and comparison sample results in all cases           . Refer to Attachment                       4 for data and QC                                                             analysis results.
: 9.                                                          INVESTIGATIONS                                            AND RESULTS

During the FSS of Survey Unit 8202, areas                                                                                                                                    with a             +3 sigma/alarms were investigated.              Forty            -three judgmental samples were collected for investigation, all with radiological   concentrations below the OpDCGL.
: 10.                              REMEDIATIONAND RESULTS

No radiological remedial action as described by MARSSIM Section 5.4 was performed in Survey Unit 8202 prior to or as a result of the FSS. Chapter 4 of the LTP determined that remediation beyond that required to meet the release criteria is unnecessary and the remaining residual radioactivity in soil was ALARA.
: 11.                              CHANGES FROM THE FINAL STATUS SURVEY PLAN

There were no addendums to the FSS plan.
: 12.                              DATA QUALITY ASSESSMENT

The DQO sample design and data were reviewed in accordance with FCSD-RA-LT-304,                                                           Final Status Survey Data Assessment (Reference 14) for completeness and consistency.
Documentation was complete and legible. Surveys and the collection of samples             were consistent with the DQOs and were sufficient to ensure that the survey unit was properly designated as Class
: 3. The survey design had adequate power as indicated by the retrospective power                        curve (see , Figure 16-5).
The measurement results indicated that all samples              were less than a SOF of           1 when compared to the OpDCGLs.

[51]
FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Although MARSSIM states that the Sign Test need not be performed in the instance that no measurements surpass the OpDCGL, the test was conducted to demonstrate adherence            to the statistical principles of the DQO process. The Sign Test was performed on the data and compared to the original assumptions of the DQOs. The evaluation of the Sign Test results clearly demonstrates that Survey Unit 8202 passes the unrestricted release criteria, thus, the null hypothesis is rejected. The results of the Sign Test are presented in Attachment                                             3.
The preliminary data review consisted of calculating basic statistical quantities (e.g., mean, median, standard deviation). All data was considered valid including negative values, zeros, and values reported below the MDC. The mean and median values for each ROC were well below the respective OpDCGLs. Also, the retrospective power curve shows that enough samples were collected to achieve the desired power; therefore,              Survey Unit 8202 meets the unrestricted release criteria with adequate power as required by the DQOs.
The mean of all identified isotopes is             less than the Consultation Triggers for Residential Soil Concentration depicted in Table H.1 of NUREG 1757, Vol.1, Rev. 2 (Memorandum of Understanding Table 1). The full table is included in Attachment 5 of this release record.
The data for Cs-137 is                                                                                     presented graphically through a                                                            frequency plot and quantile plot.                                                             All graphical presentations are provided in Attachment                                     6.
: 13.                              ANOMALIES

No anomalies were observed during the performance or analyses of the survey.
: 14.                              CONCLUSION

Survey Unit 8202 has met the DQOs of the FSS plan. The ALARA criteria as specified in Chapter 4 of the LTP were achieved. The elevated measurement comparison                                              for soils was not applicable and remediation was not required.
All identified ROCs were used for statistical testing to determine the adequacy of        Survey Unit 8202 for FSS. Evaluation of the data shows that none of the random ROC concentration values exceeds the OpDCGLs; therefore, in accordance with LTP Section 5.2.6, the Survey Unit 8202 meets the release criteria.
The sample data passed the Sign Test. The null hypothesis was rejected. The retrospective power curve showed that adequate power was achieved. Survey Unit 8202 is properly classified as Class 3.
The dose contribution from soil in Survey Unit 8202 is                                                             1.0442 mrem/yr TEDE, based on the average concentration of the ROC in samples used for nonparametric statisticaltesting                                      .

[52]
FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Survey Unit 8202 is acceptablefor unrestricted release.
: 15.                              REFERENCES
: 1.                                                                                                                                   FCSD-RA-LT-305, Final Status Survey Data Reporting
: 2.                                                                                                                                   Fort Calhoun Station Decommissioning Project License Termination Plan
: 3.                                                                                                                                   FCSD-RA-LT-302, Final Status Survey Sample Plan Development
: 4.                                                                                                                                   NUREG-1575, Revision 1,                                   Multi-Agency Radiation Survey and Site Investigation Manual
: 5.                                                                                                                                   TSD 20-001, Historical Site Assessment for Fort Calhoun Station
: 6.                                                                                                                                   TSD 21-043, Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan
: 7.                                                                                                                                   NUREG-1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance -
Characterization, Survey, and Determination of Radiological Criteria
: 8.                                                                                                                                   FCSD-RA-LT-100, Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station
: 9.                                                                                                                                   FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors
: 10.                                                                                                                                   FCSD-RA-LT-205, Chain-of-Custody Protocol for Site Characterization and Final Status Survey
: 11.                                                                                                                                   FCSD-RA-LT-203,                                                           Sample Media Collection for Site Characterization and Final Status Survey
: 12.                                                                                                                                   FCSD-RA-LT-204,                                                           Sample Media Preparation for Site Characterization and Final Status Survey
: 13.                                                                                                                                   NUREG-1576,                                   Multi-Agency Radiological Laboratory Analytical Protocols Manual
: 14.                                                                                                                                   FCSD-RA-LT-304,                                                           Final Status Survey Data Assessment
: 16.                              ATTACHMENTS

Attachment 1 - Figures Attachment 2 - Scan Data

[53]
FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Attachment 3 - Sign Test Attachment 4 - Quality Control Assessment Attachment 5 - Consultation Triggers for Residential Soil Concentrations Attachment 6 - Graphical Presentations

[54]
FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

ATTACHMENT 1 --FIGURE                                                       S

FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Figure 16 Survey Unit 8202 Scan Locations Map

FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Figure 16 Survey Unit 8202 Random and Judgmental Sample Locations Map

FSS RELEASE RECORD - REVISION                                 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

ATTACHMENT 2 --SCAN DATA

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Table 16 Survey Unit                                                                         8202 Complete Scan Data

Min Scan                                                                                                 Max Detector                                                                                  Detector                                                                                         M3001                                                                         Survey                                                                                                                                                                                           Logged                                                                                          Scan                                                                                                   Avg                                                                                 Action                                                                                 Scan Type                                                                                               ID                                                                                         ID                                                                      Unit                                                                          Location                                                                                                      Result                                                                             Logged                                                                            Background                                                                                                            Level                                                                 Alarms?
(cpm)                                                                                Result                                                                                                (cpm)                                                                                         (cpm)                                                                            (Y/N)
(cpm)

44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                                                    1                                                                                                                                                                            26288                                                                                                   29100                                                                                                                                   28160                                                                                                                   29625                                                                                                                       N 44-20                                                                                                                    PR403795                                             25021219                                                           8202                                                                                                                                                                    2                                                                                                                                                                            27699                                                                                                   31500                                                                                                                                   28160                                                                                                                   29625                                                                                                                       Y 44-20                                                                                                                    PR403795                                             25021219                                                           8202                                                                                                                                                                    3                                                                                                                                                                            28042                                                                                                   31100                                                                                                                                   28160                                                                                                                   29625                                                                                                                       Y 44-20                                                                                                                    PR403795                                             25021219                                                           8202                                                                                                                                                                    4                                                                                                                                                                            27440                                                                                                   31200                                                                                                                                   28160                                                                                                                   29625                                                                                                                       Y 44-20                                                                                                                    PR403795                                             25021219                                                           8202                                                                                                                                                                    5                                                                                                                                                                            26579                                                                                                   30700                                                                                                                                   28160                                                                                                                   29625                                                                                                                       Y 44-20                                                                                                                    PR403795                                             25021219                                                           8202                                                                                                                                                                    6                                                                                                                                                                            27952                                                                                                   31200                                                                                                                                   28160                                                                                                                   29625                                                                                                                       Y 44-20                                                                                                                    PR403795                                             25021219                                                           8202                                                                                                                                                                    7                                                                                                                                                                            27374                                                                                                   30800                                                                                                                                   28160                                                                                                                   29625                                                                                                                       Y 44-20                                                                                                                    PR403795                                             25021219                                                           8202                                                                                                                                                                    8                                                                                                                                                                            27500                                                                                                   31600                                                                                                                                   28160                                                                                                                   29625                                                                                                                       Y 44-20                                                                                                                    PR403795                                             25021219                                                           8202                                                                                                                                                                    9                                                                                                                                                                            26624                                                                                                   33100                                                                                                                                   28160                                                                                                                   29625                                                                                                                       Y 44-20                                                                                                                    PR403795                                             25021219                                                           8202                                                                                                                                                          10                                                                                                                                                                   28039                                                                                                   31600                                                                                                                                   28160                                                                                                                   29625                                                                                                                       Y 44-                                        20                                                                                                                   PR404738                                             25021210                                                           8202                                                                                                                                                          11                                                                                                                                                                   26820                                                                                                   32100                                                                                                                                   29440                                                                                                                   30938                                                                                                                       Y 44-                                        20                                                                                                                   PR404738                                             25021210                                                           8202                                                                                                                                                          12                                                                                                                                                                   24952                                                                                                   32300                                                                                                                                   29440                                                                                                                   30938                                                                                                                       Y 44-                                        20                                                                                                                   PR404738                                             25021210                                                           8202                                                                                                                                                          13                                                                                                                                                                   25555                                                                                                   30300                                                                                                                                   29440                                                                                                                   30938                                                                                                                       N 44-20                                                                     PR404738                                                                                     25021210                                                                                       8202                                                                                                  14                                                                                      26880                                                                                  34200                                                                                               29440                                                                                         30938                                                                                          Y 44-                                        20                                                                                                         PR4033795                                   25021219                                                           8202                                                                                                                                                          15                                                                                                                                                                   25225                                                                                                   28500                                                                                                                                   29720                                                                                                                   31225                                                                                                                       N 44-                                        20                                                                                                         PR4033795                                   25021219                                                           8202                                                                                                                                                          16                                                                                                                                                                   25225                                                                                                   29400                                                                                                                                   29720                                                                                                                   31225                                                                                                                       N 44-20                                                                 PR4033795                                                                                        25021219                                                                                       8202                                                                                                  17                                                                                      25225                                                                                  28600                                                                                               29720                                                                                         31225                                                                                          N 44-20                                                                 PR4033795                                                                                        25021219                                                                                       8202                                                                                                  18                                                                                      25225                                                                                  29000                                                                                               29720                                                                                         31225                                                                                          N 44-                                        20                                                                                                         PR4033795                                   25021219                                                           8202                                                                                                                                                          19                                                                                                                                                                   25225                                                                                                   29400                                                                                                                                   29720                                                                                                                   31225                                                                                                                       N 44-                                        20                                                                                                         PR4033795                                   25021219                                                           8202                                                                                                                                                          20                                                                                                                                                                   25225                                                                                                   28800                                                                                                                                   29720                                                                                                                   31225                                                                                                                       N 44-                                        20                                                                                                         PR4033795                                   25021219                                                           8202                                                                                                                                                          21                                                                                                                                                                   25225                                                                                                   29700                                                                                                                                   29720                                                                                                                   31225                                                                                                                       N 44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                                          22                                                                                                                                                                   26181                                                                                                   29700 44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                                          23                                                                                                                                                                   26181                                                                                                   30100 44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                                          24                                                                                                                                                                   26181                                                                                                   29400 44-20                                                                     PR403795                                                                                     25021219                                                                                       8202                                                                                                  25                                                                                      26181                                                                                  30500 44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                                          26                                                                                                                                                                   26181                                                                                                   30200 44-20                                                                     PR403795                                                                                     25021219                                                                                       8202                                                                                                  27                                                                                      26181                                                                                  30400 44-20                                                                     PR403795                                                                                     25021219                                                                                       8202                                                                                                  28                                                                                      26181                                                                                  29400 44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                                          29                                                                                                                                                                   26181                                                                                                   30400 44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                                          30                                                                                                                                                                   26181                                                                                                   29800 44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                                          31                                                                                                                                                                   26181                                                                                                   29500

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Min Scan                                                                                       Max Detector                                                                         Detector                                                                                 M3001                                                                  Survey                                                                                                                                                                         Logged                                                                                 Scan                                                                                          Avg                                                                          Action                                                                         Scan Type                                                                                      ID                                                                                 ID                                                               Unit                                                                   Location                                                                                            Result                                                                     Logged                                                                     Background                                                                                                  Level                                                         Alarms?
(cpm)                                                                         Result                                                                                      (cpm)                                                                                (cpm)                                                                     (Y/N)
(cpm) 44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                                          32                                                                                                                                                                   26181                                                                                                   32000 44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                                          33                                                                                                                                                                   26181                                                                                                   30800 44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                                          34                                                                                                                                                                   26181                                                                                                   30100 44-20                                                              PR403795                                                                             25021219                                                                              8202                                                                                         35                                                                              26181                                                                          30500 44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                                          36                                                                                                                                                                   26181                                                                                                   29400 44-20                                                              PR403795                                                                             25021219                                                                              8202                                                                                         37                                                                              26181                                                                          31200 44-20                                                              PR403795                                                                             25021219                                                                              8202                                                                                         38                                                                              26181                                                                          30100 44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                                          39                                                                                                                                                                   26181                                                                                                   30400 44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                                          40                                                                                                                                                                   26181                                                                                                   30600 44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                                          41                                                                                                                                                                   26181                                                                                                   29800 44-                                        20                                                                                                                   PR397732                                             25021208                                                           8202                                                                                                                                                          42                                                                                                                                                                   25544                                                                                                   29700 44-                                        20                                                                                                                   PR397732                                             25021208                                                           8202                                                                                                                                                          43                                                                                                                                                                   25544                                                                                                   29700 44-20                                                              PR397732                                                                             25021208                                                                              8202                                                                                         44                                                                              25544                                                                          30400 44-                                        20                                                                                                                   PR397732                                             25021208                                                           8202                                                                                                                                                          45                                                                                                                                                                   25544                                                                                                   30400 44-                                        20                                                                                                                   PR397732                                             25021208                                                           8202                                                                                                                                                          46                                                                                                                                                                   25544                                                                                                   29100 44-                                        20                                                                                                                   PR397732                                             25021208                                                           8202                                                                                                                                                          47                                                                                                                                                                   25544                                                                                                   29700 44-                                        20                                                                                                                   PR397732                                             25021208                                                           8202                                                                                                                                                          48                                                                                                                                                                   25544                                                                                                   29700 44-                                        20                                                                                                                   PR397732                                             25021208                                                           8202                                                                                                                                                          49                                                                                                                                                                   25544                                                                                                   29400 44-                                        20                                                                                                                   PR397732                                             25021208                                                           8202                                                                                                                                                          50                                                                                                                                                                   25544                                                                                                   29600 44-                                        20                                                                                                                   PR404738                                             25021210                                                           8202                                                                                                                                                          51                                                                                                                                                                   23539                                                                                                   29400 44-                                        20                                                                                                                   PR404738                                             25021210                                                           8202                                                                                                                                                          52                                                                                                                                                                   23539                                                                                                   30100 44-                                        20                                                                                                                   PR404738                                             25021210                                                           8202                                                                                                                                                          53                                                                                                                                                                   23539                                                                                                   29600 44-20                                                              PR404738                                                                             25021210                                                                              8202                                                                                         54                                                                              23539                                                                          30300 44-                                        20                                                                                                                   PR404738                                             25021210                                                           8202                                                                                                                                                          55                                                                                                                                                                   23539                                                                                                   28500 44-                                        20                                                                                                                   PR404738                                             25021210                                                           8202                                                                                                                                                          56                                                                                                                                                                   23539                                                                                                   29700 44-20                                                              PR397732                                                                             25021208                                                                              8202                                                                                         57                                                                              23861                                                                          28600 44-                                        20                                                                                                                   PR403795                                             25021219                                                           8202                                                                                                                                            26Q                                                                                                                                                    26181                                                                                                   30200 44-                                        20                                                                                                                   PR397204                                             25021208                                                           8202                                                         Center E Field                                                                  25225                                                                                                   35183                                                                                                                                   29160                                                                                                                   30650                                                                                                                       Y 44-                                        20                                                                                                                   PR397204                                             25021208                                                           8202                                                                                                                    Middle                                                                                                                             23539                                                                                                   31059                                                                                                                                   28500                                                                                                                   29973                                                                                                                       Y 44-                                        20                                                                                                                   PR397203                                             25021217                                                           8202                                                                                                    NE Field                                                                                                              26181                                                                                                   47514                                                                                                                                   28860                                                                                                                   30343                                                                                                                       Y 44-                                        20                                                                                                                   PR397203                                             25021217                                                           8202                                                                                              NW Field                                                                                                       25544                                                                                                   38562                                                                                                                                   28200                                                                                                                   29666                                                                                                                       Y 44-                                        20                                                                                                                   PR397732                                             25021209                                                           8202                                                                                                        SE Field                                                                                                                 23861                                                                                         132729                                                                                                                         29640                                                                                                                   31143                                                                                                                       Y 44-                                        20                                                                                                                   PR404738                                             25021210                                                           8202                                                                       SE Field QC                                                                                24771                                                                                                   33574                                                                                                                                   29060                                                                                                                   30548                                                                                                                       Y Areas above 3 standard deviations were scanned for verification of original scans prior to judgmental sample collection.

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

ATTACHMENT 3 --SIGN TEST

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Table 16 Survey Unit                                                                         8202 Sign Test
                                     #            SOF            1-Ws            Sign (Ws) 1          0.20379           0.80            +1 2          0.24476           0.76            +1 3          0.08492           0.92            +1 4          0.12051           0.88            +1 5          0.03624           0.96            +1 6          0.05603           0.94            +1 7          0.16992           0.83            +1 8          0.12790           0.87            +1 9          0.13309           0.87            +1 10          0.14945           0.85            +1 11          0.24487           0.76            +1 12          0.28017           0.72            +1 13          0.17079           0.83            +1 14          0.06512           0.93            +1 Number of positive       differences (S+)                            14

Critical Value           10

Survey Unit                 Meets the Acceptance Criteria

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

ATTACHMENT 4 --QUALITY CONTROL ASSESSMENT

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Table 16 Survey Unit                                                                         8202 QC Assessment
�6�X�U�Y�H�\\��$�U�H�D���                                              � � � �                 �6�X�U�Y�H�\\��8�Q�L�W��                       � � � �                  �6�X�U�Y�H�\\��8�Q�L�W��1�D�P�H�                                                                                                                                                                                          �:�H�V�W��2�Z�Q�H�U��&�R�Q�W�U�R�O�O�H�G��$�U�H�D�V

6MPSOH 3OMQ                                                                                          )

6MPSOH GHVFULSWLRQ   &RPSMULVRQ RI VSOLW VMPSOHV FROOHFWHG IURP VXUIMFH VRLO VMPSOHV IURP ORFMWLRQ            MQG    RHUH MQMO\\]HG XVLQJ JMPPM VSHFWURVFRS\\ E\\ RQ VLWH +3*H 6\\VWHP

6WMQGMUG ,G                                   $FWLYLW\\ 9MOXH                      6WMQGMUG  (UURU$FWLYLW\\ 9MOXH                                              6WMQGMUG                                             $EVROXWH                       53'                      7UHQGLQJ                     Acceptable?
                                                                    6WMQGMUG                                                           &RPSMULVRQ                             (UURU                                            'LIIHUHQFH                                            $VVHVVPHQW" 8202X-3-FR-GSSX-008                                                                1.28E-01                                                                                 4.24E-02                                                                                       1.86E-01                                                                  4.38E-02                                   1.57E-01                                      5.80E-02                                                                   N/A                                                                                                                        Y                                                                                                                                                        Y 8202X-3-FR-GSSA-011                                                               4.61E-01                                                                                 5.43E-02                                                                                       5.42E-02                                                                  7.80E-03                                   2.58E-01                                      4.07E-01                                                                   N/A                                                                                                                        Y                                                                                                                                                        YGuidanc e from  Sec t ion C.4.2.2 of MAR LAP 8202X-3-FJ-GSSX-053                                                                   7.18E-02                                                                                 2.50E-02                                                                                       1.82E-01                                                                  4.50E-02                                   1.27E-01                                      1.10E-01                                                                   N/A                                                                                                                        Y                                                                                                                                                        Y 8202X-3-FJ-GSSA-057                                                                   1.98E-01                                                                                 4.51E-02                                                                                       9.41E-02                                                                  4.25E-02                                   1.46E-01                                      1.04E-01                                                                   N/A                                                                                                                        Y                                                                                                                                                        YUBGR (Cs-137 OpDCGL) = 3.65 pCi /g LBGR (Mea n Cs-137Acti vi ty) = 0.1909 pCi /g Wi d th  o f th e Gra y Regi o n  ( ) = 3.4591 p Ci /g M a x Sta n d a rd  Un certa i n ty (&#xb5;M R) =  /10 = 0.3459 p Ci /g
        &RPPHQWV &RUUHFWLYH$FWLRQV %RWKVDPSOHVUHSRUWHG&V    DVDGHWHFW 7KHUHZDVDFFHSWDEOHDJUHHPHQWEHWZHHQWKHVDPSOHUHVXOWV 1RMax Relative Standard Uncertainty (MR) = 0.0948 IXUWKHUDFWLRQLVQHFHVVDU\\                                                                                                                                                                                       Average Concentration of the two measured results < UBGR:
Warning Limit = 2.83 &#xb5;MR = 0.9789 pCi/g Control Limit = 4.24 &#xb5;MR = 1.4667 pCi/g Average Concentration of the two measured results > UBGR:
Warning Limit = 2.83 MR x 100% = 26.82%
Control Limit = 4.24 MR x 100% = 40.18%

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

ATTACHMENT 5 --CONSULTATION TRIGGERS FOR                                                       RESIDENTIAL SOIL CONCENTRATION

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

ATTACHMENT 6 --GRAPHICAL PRESENTATIONS

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Figure 16 Quantile Plot for Cs                                                                        -137 Concentration Quantile  Plot For Cs                                                                                      -137

5.00E-01

4.50E-01

4.00E-01

3.50E-01

3.00E-01

2.50E-01

2.00E-01

1.50E-01

1.00E-01

5.00E-02

0.00E+00 0%                                                                                              10%                                                                                    20%                                                                                    30%                                                                                    40%                                                                                    50%                                                                                    60%                                                                                    70%                                                                                    80%                                                                                    90%                                                                          100%

PERCENTAGE

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Figure 16 Histogram for Cs-137 Concentration Frequency  Plot For Cs                                                                                                                                         -137

10 9
8 7
6 5
4 3
2 1
0 1.35E-01                                                                                                                                               2.12E-01                                                                                                                                               2.89E-01                                                                                                                                               3.66E-01                                                                                                                                               4.42E-01                                                                                                                                               5.19E-01

UPPER END VALUE (PCI/G)

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8202 WEST OWNER CONTROLLED AREA

Figure 16 Retrospective Power Curve for Survey Unit 8202

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8203 WEST OWNER CONTROLLED AREA

FORT CALHOUN STATION FINAL STATUS SURVEY RELEASE RECORD

SURVEY UNIT 8203 WEST OWNER CONTROLLED AREA

REVISION 0

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8203 WEST OWNER CONTROLLED AREA

PREPARED BY / DATE:
M. Bryant, LT/FSS Specialist

REVIEWED      BY / DATE:
M. Uz, LT/FSS Specialist

REVIEWED      BY / DATE:
A. Barker Regulatory Assurance & Emergency Planning Manager

REVIEWED      BY / DATE:
D. Whisler Manager Radiation Protection & Chemistry

APPROVED BY / DATE:
B. Bishop, LT/FSS Manager

[2]

FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8203 WEST OWNER CONTROLLED AREA

TABLE OF CONTENTS
: 1.                                              EXECUTIVE 

==SUMMARY==
................................................................................................................. 9
: 2.                                              SURVEY UNIT DESCRIPTION ...................................................................................................... 9
: 3.                                              CLASSIFICATION BASIS ................................................................................................................ 9
: 4.                                              DATA                                QUALITY OBJECTIVES ...................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  12
: 5.                                              SURVEY DESIGN ............................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      15
: 6.                                              SURVEY IMPLEMENTATION .....................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        19
: 7.                                              SURVEY RESULTS .........................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     20
: 8.                                             QUALITY CONTROL .....................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         78
: 9.                                              INVESTIGATIONS AND RESULTS .............................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                78
: 10.                       REMEDIATION AND RESULTS ..................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       78
: 11.                        CHANGES FROM THE FINAL STATUS SURVEY PLAN .......................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            78
: 12.                       DATA QUALITY ASSESSMENT ..................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       78
: 13.                        ANOMALIES ....................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              79
: 14.                        CONCLUSION .................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  79
: 15.                        REFERENCES ..................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        80
: 16.                        ATTACHMENTS .............................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 80

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8203 WEST OWNER CONTROLLED AREA

LIST OF TABLES

Table 3-1               - Statistical Quantities for Cs-137                and Co-60 from the Characterization Survey of 8203                 10 Table 3-2               - Off-Site Analysis for Characterization Samples in 8203              ...................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              11 Table 4-1               - Base Case DCGLs for Soil ....................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           14 Table 4-2               - Operational DCGLs for Soil ................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               14 Table 5-1               - Action Levels for Survey Unit 8203 .....................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     15 Table 5-2               - Random Sample Locations                                ...................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                16 Table 5-3               - Judgmental Sample Locations                                     .............................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              17 Table 5-4               - Investigation Levels ..............................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         18 Table 5-5               - Synopsis of Survey  Design ....................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           19 Table 7-1               - Synopsis of Scan Results .......................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            21 Table 7-2               -- Summary of Gamma Spectroscopy Results and OpSOF Calculations for Samples Comprising the Statistical Sample Population ...............................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   68 Table 7-3               -- Basic Statistical Properties of Random Sample Population and Survey Unit Dose  .......                                                                        71 Table 7-4               -- Summary of Gamma Spectroscopy Results and OpSOF Calculations for Judgmental Samples ..............................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           71 Table 7-5               -- Summary of Gamma Spectroscopy Results and OpSOF Calculations for QC Samples 77 Table 16-1               - Survey Unit 8203 Complete Scan Data .............................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             85 Table 16-2               - Survey Unit 8203 Sign Test ................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               88

LIST OF FIGURES

Figure 7-1               - Survey Unit 8203 South West Walkover GPS Scan Results                                              ............................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 23 Figure 7-2               - Survey Unit 8203 South West Walkover Z                                            -Score Map              ....................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         24 Figure 7-3               - Survey Unit 8203 South West Walkover Z                                            -Score and Sample Locations Map (35 & 36)
                            ............................................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     25 Figure 7-4               -- Survey Unit 8203 Large Middle Section Walkover GPS Scan Results                        ..........................                                                                                                                                                                                                                                                                                          26 Figure 7-5               - Survey Unit 8203 Large Middle Section Walkover Z                       -Score Map               ..................................                                                                                                                                                                                                                                                                                                                                                                                  27 Figure 7-6               - Survey Unit 8203 Large Middle Section Walkover Z                       -Score and Sample Locations Map (23) ......................................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   28 Figure 7-7               - Survey Unit 8203 Large Middle Section Walkover Z                       -Score and Sample Locations Map (24 & 25).............................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                29 Figure 7-8               -- Survey Unit 8203 East Walkover GPS Scan Results                       .......................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          30 Figure 7-9                          - Survey Unit 8203 East Walkover Z                       -Score Map               ................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              31 Figure 7-10               - Survey Unit 8203 East Walkover Z                       -Score and Sample Locations Map (15               -17) ..........                                                                                                         32 Figure 7-11               -- Survey Unit 8203 Southwest Middle Walkover GPS Scan Results                        ..............................                                                                                                                                                                                                                                                                                                                                      33 Figure 7-12               -- Survey Unit 8203 South West Middle Walkover Z                                            -Score Map               ....................................                                                                                                                                                                                                                                                                                                                                                                                                        34 Figure 7-13               - Survey Unit 8203 South West Middle Walkover Z                                            -Score and Sample Locations Map (33 & 34).............................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                35 Figure 7-14               -- Survey Unit 8203 South West Corner Walkover GPS Scan Results                                              ............................                                                                                                                                                                                                                                                                                                                36

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8203 WEST OWNER CONTROLLED AREA

Figure 7-15               -- Survey Unit 8203 South West Corner Walkover Z                                          -Score Map               ...................................                                                                                                                                                                                                                                                                                                                                                                                             37 Figure 7-16               -- Survey Unit 8203 Southwest Corner Walkover Z                    -Score and Sample Locations Map (47) ......................................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   38 Figure 7-17               - Survey Unit 8203 Dispersed Areas #1 Walkover GPS Scan Results                     ............................                                                                                                                                                                                                                                                                                                                39 Figure 7-18               - Survey Unit 8203 Dispersed Areas #1 Walkover Z-Score Map                                                                 ....................................                                                                                                                                                                                                                                                                                                                                                                                                        40 Figure 7-19               -- Survey Unit 8203 Dispersed Areas #1 Walkover Z-Score and Sample Locations Map (22) ......................................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   41 Figure 7-20               -- Survey Unit 8203 Dispersed Areas #1 Walkover Z-Score and Sample Locations Map (31 & 32).............................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                42 Figure 7-21               - Survey Unit 8203 Southeast Corner GPS Scan Results  .................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        43 Figure 7-22               - Survey Unit 8203 Southeast Corner Walkover Z-Score Map                                                                 .......................................                                                                                                                                                                                                                                                                                                                                                                                                                                          44 Figure 7-23               - Survey Unit 8203 Southeast Corner Walkover Z-Score and Sample Locations Map (45 & 46).............................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                45 Figure 7-24               - Survey Unit 8203 Dispersed Areas #2 Walkover GPS Scan Results                     ............................                                                                                                                                                                                                                                                                                                                46 Figure 7-25               - Survey Unit 8203 Dispersed Areas #2 Walkover Z-Score Map                                                                 ....................................                                                                                                                                                                                                                                                                                                                                                                                                        47 Figure 7-26               - Survey Unit 8203 Dispersed Areas #2 Walkover Z-Score and Sample Locations Map (18-21)               ................................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 48 Figure 7-27               - Survey Unit 8203 Dispersed Areas #2 Walkover Z-Score and Sample Locations Map (26 & 27).............................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                49 Figure 7-28               - Survey Unit 8203 Middle Walkover GPS Scan Results                        .................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        50 Figure 7-29               - Survey Unit 8203 Middle Walkover Z                      -Score Map               .........................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                51 Figure 7-30               - Survey Unit 8203 Middle Walkover Z                      -Score and Sample Locations Map (28               -30)               .....                                                  52 Figure 7-31               - Survey Unit 8203 Far North Walkover GPS Scan Results                        ............................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 53 Figure 7-32               - Survey Unit 8203 Far North Walkover Z                       -Score Map               ....................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         54 Figure 7-33               - Survey Unit 8203 Far North Walkover Z                       -Score and Sample Locations Map (37 & 39)
                          ............................................................................................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     55 Figure 7-34               - Survey Unit 8203 QC Walkover GPS Scan Results                       .......................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          56 Figure 7-35               - Survey Unit 8203 QC Walkover Z                       -Score Map               ...............................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   57 Figure 7-36               - Survey Unit 8203 Bravo Walkover GPS Scan Results                       ...................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              58 Figure 7-37               - Survey Unit 8203 Bravo Walkover Z                       -Score Map               ...........................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      59 Figure 7-38               - Survey Unit 8203 Bravo Walkover Z                       -Score and Sample Locations Map (41               -43)               .......                                                                        60 Figure 7-39               - Survey Unit 8203 Bravo Walkover Z                       -Score and Sample Locations Map (44)                ............                                                                                                                                61 Figure 7-40               - Survey Unit 8203 Beehive Walkover GPS Scan Results                        ................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             62 Figure 7-41               - Survey Unit 8203 Beehive Walkover Z                       -Score Map               ........................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     63 Figure 7-42               - Survey Unit 8203 Beehive Walkover Z                       -Score and Sample Locations Map (48 & 49)                   64 Figure 7-43               - Survey Unit 8203 Alpha Walkover GPS Scan Results                        ...................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              65 Figure 7-44               - Survey Unit 8203 Alpha Walkover Z                      -Score Map               ...........................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      66 Figure 7-45               - Survey Unit 8203 Alpha Walkover Z                      -Score and Sample Locations Map (38 & 40)                 ...                            67 Figure 16-1               - Survey Unit 8203 Random Sample Locations  .................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              83 Figure 16-2               - Survey Unit 8203 QC Assessment ....................................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          90 Figure 16-3               -- Quantile Plot for Cs-137 Concentration                .........................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 94

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8203 WEST OWNER CONTROLLED AREA

Figure 16-4               - Histogram for Cs-137 Concentration                                                                ..............................................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        95 Figure 16-5               - Retrospective Power Curve for Survey Unit 8203 ..........................................................                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           96

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8203 WEST OWNER CONTROLLED AREA

LIST OF ABBREVIATIONS delta
/                                                                                                                                                                                                     relative shift sigma ALARA                                                                                                               as low as is reasonably achievable BcDCGL                                                                                            base case derived concentration guideline level BcSOF                                                                                                                                      base case sum of fractions cpm                                                                                                                                                                                         counts per minute DQA                                                                                                                                                                  data quality assessment DQO                                                                                                                                                                    data quality objective DCGL                                                                                                                                       derive                        d concentration guideline level DCGLW                                                                                                                    derived concentration guideline level wide area FCS                                                                                                                                                                                    Fort Calhoun Station FSS                                                                                                                                                                                         final status survey GPS                                                                                                                                                                                 Global Positioning System HTD                                                                                                                                                                       hard-to-detect IC                                                                                                                                                                                                                          insignificant contributor LBGR                                                                                                                                          lower bound of the gray region LT/FSS                                                                                                                            License Termination/Final Status Survey LTP                                                                                                                                                                                    license termination plan m                                                                                                                                                                                                                                    meter MARSSIM                                                       Multi-Agency Radiation Survey and Site Investigation Manual MDC                                                                                                                                                            minimum detectable concentration mrem/yr                                                                                                               millirem per year NaI                                                                                                                                                                                                  sodium iodide NRC                                                                                                                                                                       Nuclear Regulatory Commission OpDCGL                                                                                         operational derived concentration guideline level

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8203 WEST OWNER CONTROLLED AREA

pCi/g                                                                                                                                                               picocuries per gram QAPP                                                                                                                                               quality assurance project plan QC                                                                                                                                                                                                       quality control ROC                                                                                                                                                                       radionuclides of concern SOF                                                                                                                                                                                 sum of fractions TEDE                                                                                                                                               total effective dose equivalent TSD                                                                                                                                                                               technical support document UBGR                                                                                                                                      upper bound of the gray region VSP                                                                                                                                                                      Visual Sample Plan

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8203 WEST OWNER CONTROLLED AREA
: 1.                                                                                       EXECUTIVE 

==SUMMARY==

This final status survey (F                                   SS) release record for Survey Unit 8203, West Owner Controlled Area                                                                                                ,
has been generated in accordance with procedure FCSD           -RA-LT-305,                                                           Final Status Survey Data Reporting (Reference1                                 ) and satisfies the requirements of             Section 5.7.1 of the                                                                                                                                                                         Fort Calhoun Station Decommissioning Project License Termination Plan  (FCS           ; LTP; Reference                                                                                                              2).
An FSS sample plan for Survey Unit 8203 was developed in accordance with procedure FCSD                                                                                                            -
RA-                                                                  LT-302,                                                           Final Status Survey Sample Plan                                    Development (Reference                                                       3), the FCS                                    LTP, and with guidance from NUREG-1575, Revision 1,                                   Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM; Reference4                                 ).
Survey Unit 8203, an open land survey unit, has a MARSSIM classification of                                                                                                                          3. A                                                              survey plan was designed based upon use of the Sign Test as the nonparametric statistical test for compliance. Both the Type I (           ) and Type II () decision error rates were set at 0.05. As a random sample population, 14 soil samples were acquired from the survey unit. In addition, soil scanning was performed on 10% of the total surface area in the survey unit            . The analytical results for all soil samples taken in  Survey Unit 8203 indicate that the                                                                                      maximum s                                                 um of fractions (SOF), considering the concentration of all applicable radionuclides of concern (ROCs), is                                                                                                                                                               equal to 0.2485 when applying the respective operational                                     derived concentration guideline levels (OpDCGL) for soil. Therefore, the null hypothesis is rejected and Survey Unit 8203is acceptable for unrestricted release. The mean SOF when applying the respective base case             derived concentration guideline levels (BcDCGL) for soilis                                                    0.0361. This SOF equates to a dose for the Survey Unit 8203 of 0.9026 millirem                                                                                                                                                                                                                                                                                                   per year (mrem/yr).
: 2.                                                                                       SURVEY UNIT DESCRIPTION

Survey Unit 8203is an impacted Class                                                                                                                                                                       3 open land survey unit                                    . The                         surfacearea of the survey unit is 99,184 meters (m)2.
The boundary of the survey unit and the location of the soil samples were defined using a Global Positioning System (GPS). Refer to                                           Attachment 1 of this report for              a figure depicting Survey Unit 8203.
: 3.                                                                                       CLASSIFICATION BASIS

Survey Unit 8203was identified in                                                                                                              the technical support document (TSD) 20-001, Historical Site Assessment for Fort Calhoun Station  (Reference5                                                      ) as a Class             3 survey unit. The initial site characterization surveys were conducted between November 2019 and July 2020. The                                                                                                                                    following summarizes the results of the characterization survey for Survey Unit 8203.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8203 WEST OWNER CONTROLLED AREA

In total, eight                         surface soil samples were collected in                                               Survey Unit 8203. All samplesfrom Survey Unit 8203 were analyzed by the on-site gamma spectroscopy system. Cs            -137 wasdetected at concentrations above minimum detectable concentration (MDC)                                                            in six of the samples, at a maximum concentration of 2.35E-01 picocuries per gram (pCi/g                ). Co                        -60 was not detected at concentrations above MDC in any of the surface soil samples                                     . A summary of the analyses for surface soil samples taken during site characterization are presented in Table                                                      3-1.
Three surface soil             samples were sent to             GEL Laboratories for off            -site analysisof the initial suite of radionuclides. A summary of the off-site analyses is presented in Table             3-2.

Table 3 Statistical Quantities for Cs                                                                         -137 and Co-60 from the Characterization Survey of 8203 Surface Soil                                             Co-60                          Cs-137
                                                                                      # of Samples                                                                                                                                                                                                                                                                                                                                                   8
                                                                                          # >MDC                                                                                                                                                                                                                                                                     0                                                                                                                                                                                                6 Mean (pCi/g)                                                                                                                                                                 9.74E-02                                                                1.22E-01 Median (pCi/g)                                                                                                                                                 1.03E-01                                                                1.07E-01 Max (pCi/g)                                                                                                                                                                          2.21E-01                                                                2.35E-01 Min (pCi/g)                                                                                                                                                                         0.00E+00                                                                                                   7.28E-02 Standard Deviation (pCi/g)                                                   6.80E-02                                                                5.06E-02

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8203 WEST OWNER CONTROLLED AREA

Table 3 Off                                                                       -Site Analysis for Characterization Samples in 8203 Radionuclides                                                                                                                                                 8200X-3-CJ-GSSX-033                                                                                                                                                                                                                                     8200X-3-CJ-GSSX-035                                                                                                                                                                                                                                8200X-3-CR-GSSX-023 Am-241                                                                                                                                                                                                                                                                                      0.00E+00                                                                                                                                                                                                                                                                                                                                                0.00E+00                                                                                                                                                                                                                                                                                                                                                  2.05E-03 Sb-125                                                                                                                                                                                                                                                      0.00E+00                                                                                                                                                                                                                                                                                                                                                     5.18E-02                                                                                                                                                                                                                                                                                                          0.00E+00 C-14                                                                                                                                                                                                                                                                                            0.00E+00                                                                                                                                                                                                                                                                                                                                                     2.73E-01                                                                                                                                                                                                                                                                                                          0.00E+00 Ce-144                                                                                                                                                                                                                                                     0.00E+00                                                                                                                                                                                                                                                                                                                                                0.00E+00                                                                                                                                                                                                                                                                                                                                             0.00E+00 Cs-134                                                                                                                                                                                                                                                           9.65E-02                                                                                                                                                                                                                                                                                                                  4.19E-03                                                                                                                                                                                                                                                                                                               5.91E-02 Cs-137                                                                                                                                                                                        2.23E-01                                                                                                                                                                                                                                               2.31E-01                                                                                                                                                                                                                                              1.71E-01 Co-57                                                                                                                                                                                                                                          0.00E+00                                                                                                                                                                                                                                                                                                                                                   1.12E-02                                                                                                                                                                                                                                                                                                               1.25E-02 Co-58                                                                                                                                                                                                                                               9.29E-03                                                                                                                                                                                                                                                                                                                  3.30E-02                                                                                                                                                                                                                                                                                                          0.00E+00 Co-60                                                                                                                                                                                                                                               1.19E-02                                                                                                                                                                                                                                                                                                                  1.62E-02                                                                                                                                                                                                                                                                                                          0.00E+00 Cm-242                                                                                                                                                                                                                                                                                           6.40E-03                                                                                                                                                                                                                                                                                                                  6.79E-03                                                                                                                                                                                                                                                                                                               7.64E-03 Cm-243/244                                                                                                                                                                                                               1.07E-02                                                                                                                                                                                                                                                                                                             0.00E+00                                                                                                                                                                                                                                                                                                                                               9.30E-03 Eu-152                                                                                                                                                                                                                                                     0.00E+00                                                                                                                                                                                                                                                                                                                                              0.00E+00                                                                                                                                                                                                                                                                                                                                           0.00E+00 Eu-154                                                                                                                                                                                                                                                          5.30E-04                                                                                                                                                                                                                                                                                                             0.00E+00                                                                                                                                                                                                                                                                                                                                               4.61E-02 Eu-155                                                                                                                                                                                                                                                     0.00E+00                                                                                                                                                                                                                                                                                                                                                   1.48E-01                                                                                                                                                                                                                                                                                                               4.57E-02 Fe-55                                                                                                                                                                                                                                              3.43E+00                                                                                                                                                                                                                                                                                                                                              4.19E+00                                                                                                                                                                                                                                                                                                                                           5.14E+00 Mn-54                                                                                                                                                                                                                                          1.21E-02                                                                                                                                                                                                                                                                                                                  1.82E-03                                                                                                                                                                                                                                                                                                               1.41E-03 Np-237                                                                                                                                                                                                                                                                                           0.00E+00                                                                                                                                                                                                                                                                                                                                              0.00E+00                                                                                                                                                                                                                                                                                                                                           0.00E+00 Ni-59                                                                                                                                                                                                                                              0.00E+00                                                                                                                                                                                                                                                                                                                                                   9.72E-02                                                                                                                                                                                                                                                                                                               5.80E-01 Ni-63                                                                                                                                                                                                                                                  5.41E-01                                                                                                                                                                                                                                                                                                             0.00E+00                                                                                                                                                                                                                                                                                                                                           0.00E+00 Nb-94                                                                                                                                                                                                                                                                                      1.49E-02                                                                                                                                                                                                                                                                                                             0.00E+00                                                                                                                                                                                                                                                                                                                                           0.00E+00 Pu-238                                                                                                                                                                                                                                                           5.78E-03                                                                                                                                                                                                                                                                                                                  2.31E-03                                                                                                                                                                                                                                                                                                          0.00E+00 Pu-239/240                                                                                                                                                                                               0.00E+00                                                                                                                                                                                                                                                                                                                                                   1.48E-02                                                                                                                                                                                                                                                                                                          0.00E+00 Pu-241                                                                                                                                                                                                                                                           2.81E-01                                                                                                                                                                                                                                                                                                                  6.42E-01                                                                                                                                                                                                                                                                                                          1.87E+00 Ag-110m                                                                                                                                                                                                                    2.81E-02                                                                                                                                                                                                                                                                                                                  5.00E-02                                                                                                                                                                                                                                                                                                               4.43E-02 Sr-90                                                                                                                                                                                                                                                                                            2.48E-02                                                                                                                                                                                                                                                                                                                  3.61E-03                                                                                                                                                                                                                                                                                                               2.17E-01 Tc-99                                                                                                                                                                                                                                                                                    0.00E+00                                                                                                                                                                                                                                                                                                                                              0.00E+00                                                                                                                                                                                                                                                                                                                                           0.00E+00 H-3                                                                                                                                                                                                                                                           0.00E+00                                                                                                                                                                                                                                                                                                                                              0.00E+00                                                                                                                                                                                                                                                                                                                                           0.00E+00 Zn-65                                                                                                                                                                                                                                                                                        1.02E-01                                                                                                                                                                                                                                                                                                                  2.69E-02                                                                                                                                                                                                                                                                                                               1.22E-01 Note: Bold values indicate concentration greater than MDC. Unbolded values indicate the value                                         below MDC. All values in pCi/g.

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FSS RELEASE RECORD - REVISION 0 SURVEY UNIT 8203 WEST OWNER CONTROLLED AREA

Based upon a                                                                                                                                                 review of the historical information, the results of the   characterization survey data, and completion of a Survey Unit Classification Worksheet, the correct final classification of Survey Unit 8203was determined to be Class                                                                                                               3.
: 4.                                                                                      DATA QUALITY OBJECTIVES

FSS planning and design relies on a properly executed data                                                                                                                                                                                                                                                                         quality                         objective (DQO)            process to ensure, through compliance with explicitly defined inputs and boundaries, that the primary objective of the survey is satisfied. The DQO process, utilized in accordance with MARSSIM, is described in the  FCS LTP. The appropriate design for a given survey was                                                                                                                                      developed using the DQO process as outlined in Appendix D of MARSSIM                                   . A summary of                         the seven steps of the DQO process are outlined in the following paragraphs.
The DQO process incorporates hypothesis testing and probabilistic sampling distributions to control decision errors during data analysis. Hypothesis testing is a process based on the scientific method that compares a baseline condition to an alternate condition  . The baseline condition is technically known as the null hypothesis. Hypothesis testing rests on the premise that the null hypothesis is true and sufficient evidence must be provided to reject it in favor of the alternative hypothesis. In designing the survey plan, the underlying assumption, or null hypothesis, was that residual activity in the survey unit exceeded the release criteria. Rejection of the null hypothesis would indicate that residual activity within the survey unit does not exceed the release criteria. Therefore, the survey unit would satisfy the primary objective of the FSS sample plan.
The primary objective of the FSS sample plan is to demonstrate that the level of residual radioactivity in Survey Unit 8203 did not exceed the release criteria specified in the LTP and that the potential dose from residual radioactivity is   as low as is reasonably achievable (ALARA).
TSD 21-043,Radionuclides of Concern in Support of the Fort Calhoun License Termination Plan (Reference             6) establishe                                    s the basis for an initial suite of potential ROC s for decommissioning. LTP Chapter 2 provides detailed characterization data that describes                                                                          the results of surveys completed of soil. Surface  samples were taken in each impacted open land survey unit and analyzed for the presence of plant-derived radionuclides. The results of surface soil characterization in the impacted area surrounding   FCS indicate that there is minimal residual radioactivity in soil.
Insignificant contributors (ICs) were determined consistent with the guidance contained in Section 3.3 of NUREG            -1757, Volume 2, Revision 2, Consolidated Decommissioning Guidance
- Characterization                                    , Survey, and Determination of Radiological Criteria                                                              (Reference7                                             ). For soil,

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the ROCs were found to be Cs-137, Co-60, Eu-152, and C-14. The remaining radionuclides were designated as IC and were eliminated from further detailed evaluation.
Section 5.2.6 of the LTP states that each radionuclide specific B            cDCGL is equivalent to the level of residual radioactivity (above background levels) that could, when considered independently, result in a total effective dose equivalent (TEDE) of 25 mrem/yr to an Average Member of the Critical Group. To ensure that the summation of dose from each source term is 25 mrem/yr or less after all FSS is completed, the  BcDCGLs are reduced based on an expected, or a priori, fraction of the 25 mrem/yr dose limit from each source term. The reduced DCGLs (i.e.,
OpDCGLs                       ) can be related to the BcDCGLs as an expected fraction of dose based on an a priori assessment of what the expected dose should be based on the results of site characterization, process knowledge, and the extent of planned remediation. The OpDCGL is then used as the DCGL for the FSS design of the survey unit (e.g., calculation of surrogate DCGLs or, investigation levels). Details of the OpDCGLs derived for each dose component and the basis for the applied a priori dose fractions are provided in Section 5.2.6 of the LTP.
Multiple ROCs are known to be present at FCS           . The dose contribution from each ROC is accounted for using the SOF to ensure that the total dose from all ROC does not exceed the dose criterion. A BcDCGL that is established for the average residual radioactivity in a survey unit is equivalent to a derived concentration guideline level wide area (            DCGLW) as defined in MARSSIM.
At FCS, compliance is demonstrated through the summation of dose from seven distinct source terms (i.e., basements, soils, buried pipe,                                     embedded pipe, above-ground structures, basement fill, and groundwater) for the end state. When applied to soil, the DCGLs are expressed in units of activity per unit of mass (pCi/g).
For FCS, soil is             defined as a layer of soil beginning at the surface but extending to a depth of 1 m to allow for flexibility in compliance demonstration if contamination deeper than 0.15 m is encountered. Based on characterization data and historical information, there are no expectations of encountering a source term geometry that is comprised of a clean surface layer of soil over a contaminated subsurface soil layer. Section 6.9 of the LTP provides the exposure scenarios and modeling parameters that were  used to calculate the site-                                   specific soil DCGLs. The adjusted soil DCGLs for the unrestricted release of open land survey units as provided in the Section 6.16 of the LTPare pre                                                                                                                                              sented in Table 4-1. The IC dose percentage of                                                 5% was used to adjust the DCGLs in Table                                     4-1 to account for the dose from the eliminated IC radionuclides.

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Table 4 Base Case DCGLs for Soil Radionuclide                                      Surface Soil                                        Subsurface Soil BcDCGL (pCi/g)                                           BcDCGL (pCi/g)
C-14                                                                                                                                                                                                                                              5.70E+01                                                                                                                                                                                                                                                                 9.68E+00 Co-60                                       3.77E+00                                                2.93E+00 Cs-137                                                                                                                                                                                                        1.31E+01                                                                                                                                                                                                                                                              7.27E+00 Eu-152                                                                                                                                                                                                       8.41E+00                                                                                                                                                                                                                                                                 7.36E+00

The reduced DCGLs, OpDCGLs, are calculated using Equation 5-1 from Chapter 5 of the LTP, shown below.

Equation 4 OpDCGL Calculation

The OpDCGLs for the unrestricted release of               soil are provided in Table                                    4-2.

Table 4 Operational DCGLs for Soil Radionuclide                                      Surface Soil                                          Subsurface Soil OpDCGL                       (pCi/g)                      OpDCGL                       (pCi/g)
C-14                                       1.59E+01                                                  2.71E+00 Co-60                                                                                                                                                                                                     1.06E-00                                                                                                                                                                                                                                           8.21E-01 Cs-137                                                                                                                                                                                                             3.65E+00                                                                                                                                                                                                                                                                              2.04E-00 Eu-152                                                                                                                                                                                                           2.36E+00                                                                                                                                                                                                                                                                              2.06E-00

Instrument DQOs included a verification of the ability of the survey instrument to detect the radiations of interest relative to the OpDCGL . Survey instrument response checks were required prior to issuance and after the instrument had been used. Control and accountability of survey instruments was required to assure the quality and prevent the loss of data.
As part of the DQOs applied to laboratory processes, analysis results were reported as actual calculated results. The actual                                            reported value was used as the recorded FSS result for measurement and sample values that are less than MDC . Negative values were recorded as zero. Results were not reported as less than MDC            . Sample report summaries included unique

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sample identification, analytical method, radionuclide, result, uncertainty, laboratory data qualifiers, units, and the observed MDC.
In accordance with the LTP, for laboratory analysis, MDCs less than 10 % of the OpDCGL were preferable while MDCs up to 50% of the OpDCGL were            acceptable. The minimum acceptable MDC for measurements obtained using field instruments was 50% of the applicable O            pDCGL                       .
: 5.                                                                                      SURVEY DESIGN

The level of effort associated with planning a survey is based on the complexity of the survey and nature of the hazards. Guidance for preparing FSS plans is provided in procedure FCSD-RA-LT-302, Final Status Survey Sample Plan                                                                                               Development (Reference 3).
The DQO process validated that Co                                    -60, Cs                                                                        -137, Eu                                                                       -152, and C-14 would be the ROCs in Survey Unit 8203 as presented in LTP Section                                                                                                                         5.2.5. As discussed in LTP Section                                                                                                                          5.2.6.2, instead of inferring the  concentrations for the            hard to detect (HTD) ROC                                               C-14 using a surrogate approach, 100% of all samples collected in the survey unit were sent for off             -site analysis for C-14. The action levels for  Survey Unit 8203sample results                                                                                                                                            are based on 50% of the Table 4-2OpDCGL                                   s and are presented in Table             5-1.

Table 5 Action Levels for                                                                         Survey Unit 8203 ROC                            Action Level (pCi/g)
Co-60                                                                                                                                                                                                                                                    5.30E-01 Cs-137                                                                                                                                                                                                                                                            1.83E+00 Eu-152                                                                                                                                                                                                                                                           1.18E+00 C-14                                                                                                                                                                                                                                                                                                  7.95E+00

The Sign Test was selected             as the            appropriate nonparametric statistical test  to demonstrate compliance with the release  criteria. The use of the Sign Test did not require the selection or use of a background reference area, which simplified survey design and implementation. This approach was conservative since it included background Cs-137 as part of the sample set.
The number of soil samples for FSS was determined in accordance with procedureFCSD                                  -RA-LT-302 (Reference                                                                                                                                               3). The relative shift (/) for the survey unit data set is defined as shift (),
which is the upper boundary of the                                     gray                        region (UBGR), or the DCGL (SOF of 1), minus the lower bound of the gray region (LBGR)                                                                        , divided by sigma (), which is the standard deviation of the data set used for survey design. The optimal value for / should range between 1 and 3. The largest value the / can have is 3. If the calculated value of / exceeds 3, an adjusted value of

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three (3) will be used for /. The / for Survey Unit 8203, based                                                                                                                                     on the data for surface soil samples collected during the characterization             of            Survey Unit 8203, was calculated as follows:

Equation 5 Relative Shift
                                                                                                              =                (1                 0.0592)          =               27.3 0.0345

As the calculated / was greater than 3, a value of 3 was used as the adjusted /. Both the Type I error (i.e.,  value                                        ) and the Type II error (i.e.,  value)                             were set at 0.05. The sample size from Table 5-5 of MARSSIM that equates to the Type I and Type II error of 0.05 for use with the Sign Test is an N value of 14.
A prospective                         power                        curve was generated using MARSSIM Power 2000, a software package developed under the sponsorship of the United States Nuclear Regulatory Commission (NRC) for implementation of the MARSSIM in support of the decommissioning license termination rule (10 CFR 20, Subpart E). The result of the MARSSIM Power 2000                                                                                                        computer run showed adequate power for the survey design.
Given that Survey Unit 8203 is Class 3, sample locations were selected randomly using Visual Sample Plan (VSP), in accordance with FCSD                                   -RA-                                                                  LT-302 (Reference 3)                                                                                                                                              . Input parameters included use of aerial photographs and             the random sampling tool set with a predetermined number (14) of samples. The random coordinates generated with VSP were integrated with a GPS to identify sample locations in the field.              Table             5-2                        lists the random samples collected for FSS and the corresponding GPS coordinates, based on the Nebraska             State Plane North American Datum 1983 coordinate system.

Table 5 Random Sample Locations Sample ID                                                             Northing                                                        Easting 8203X-3-FR-GSSX-001                                                                                                                                                             194064.963                                                                                                                                                                                                                               826420.626 8203X-3-FR-GSSX-002                                                                                                                                                             194183.778                                                                                                                                                                                                                      826632.795 8203X-3-FR-GSSX-003                                                                                                                                                             193985.753                                                                                                                                                                                                                               826367.583 8203X-3-FR-GSSX-004                                                                                                                                                   194104.5663                                                                                                                                                                                                                                         826579.753 8203X-3-FR-GSSX-005                                                                                                                                                   194223.3836                                                                                                                                                                                                                                         826473.668 8203X-3-FR-GSSX-006                                                                                                                                                   194038.5598                                                                                                                                                                                                                                         826341.062 8203X-3-FR-GSSX-007                                                                                                                                                   194157.3751                                                                                                                                                                                                                               826553.2318 8203X-3-FR-GSSX-008                                                                                                                                                   193959.3496                                                                                                                                                                                                                               826447.1473 8203X-3-FR-GSSX-009                                                                                                                                                   194196.9802                                                                                                                                                                                                                                         826394.105 8203X-3-FR-GSSX-010                                                                                                                                                   193998.9547                                                                                                                                                                                                                               826606.2741 8203X                            FR-GSSA-011                                                                                                                                                                       194117.77                                                                                                                                                                                                                                                   826400.1896

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Sample ID                                                                                                                                                 Northing                                                                                                                                      Easting 8203X                            FR-GSSX-012                                                                                                                                                   194051.7615                                                                                                                                                                                                                               826502.6759 8203X                            FR-GSSX-013                                                                                                                                                   194170.5768                                                                                                                                                                                                                               826396.5914 8203X                            FR-GSSX-014                                                                                                                                                   193972.5513                                                                                                                                                                                                                               826608.7605

In accordance with the sample plan, at least one judgmental sample is required from the survey unit. The number of judgmental samples collected was 35, which brings the total number of samples collected for the FSS of Survey Unit 8203 to 49. Table                                                                                                            5-3                         lists the judgmentalsamples collected for FSS and the corresponding GPS coordinates.

Table 5 Judgmental Sample Locations Sample ID                                                                                                                                                       Northing                                                                                                                                                   Easting 8203X                            FJ-GSSX-015                                                                                                                                                                                                                             194139.061                                                                                                                                                                                                                                                                               826468.64 8203X                            FJ-GSSX-016                                                                                                                                                                                                                             194141.241                                                                                                                                                                                                                                                                    826465.122 8203X                            FJ-GSSX-017                                                                                                                                                                                                                             194099.308                                                                                                                                                                                                                                                                    826443.168 8203X                            FJ-GSSX-018                                                                                                                                                                                                                             194090.996                                                                                                                                                                                                                                                                    826432.059 8203X                            FJ-GSSX-019                                                                                                                                                                                                                             194078.903                                                                                                                                                                                                                                                                    826441.102 8203X                            FJ-GSSX-020                                                                                                                                                                                                                             194076.186                                                                                                                                                                                                                                                                    826414.702 8203X                            FJ-GSSX-021                                                                                                                                                                                                                             194062.762                                                                                                                                                                                                                                                                    826437.511 8203X                            FJ-GSSX-022                                                                                                                                                                                                                             194056.741                                                                                                                                                                                                                                                                    826425.406 8203X                            FJ-GSSA-023                                                                                                                                                                                                                             194013.997                                                                                                                                                                                                                                                                    826400.026 8203X                            FJ-GSSX-024                                                                                                                                                                                                                             194010.344                                                                                                                                                                                                                                                                    826415.467 8203X                            FJ-GSSX-025                                                                                                                                                                                                                             194008.179                                                                                                                                                                                                                                                                    826404.059 8203X                            FJ-GSSX-026                                                                                                                                                                                                                             193988.253                                                                                                                                                                                                                                                                    826403.333 8203X                            FJ-GSSX-027                                                                                                                                                                                                                                       193976.03                                                                                                                                                                                                                                                                                                   826400.968 8203X                            FJ-GSSX-028                                                                                                                                                                                                                             193966.502                                                                                                                                                                                                                                                                    826394.469 8203X                            FJ-GSSX-029                                                                                                                                                                                                                             193963.189                                                                                                                                                                                                                                                                    826406.534 8203X                            FJ-GSSX-030                                                                                                                                                                                                                             193949.533                                                                                                                                                                                                                                                                    826388.739 8203X                            FJ-GSSA-031                                                                                                                                                                                                                             193934.851                                                                                                                                                                                                                                                                    826383.258 8203X                            FJ-GSSX-032                                                                                                                                                                                                                                       193931.15                                                                                                                                                                                                                                                                                                   826394.381 8203X                            FJ-GSSX-033                                                                                                                                                                                                                             193952.693                                                                                                                                                                                                                                                                                        826436.6 8203X                            FJ-GSSX-034                                                                                                                                                                                                                             193940.003                                                                                                                                                                                                                                                                    826430.913 8203X                            FJ-GSSX-035                                                                                                                                                                                                                             193946.967                                                                                                                                                                                                                                                                    826458.944 8203X                            FJ-GSSX-036                                                                                                                                                                                                                                       193931.13                                                                                                                                                                                                                                                                                                   826436.241 8203X                            FJ-GSSX-037                                                                                                                                                                                                                             194152.882                                                                                                                                                                                                                                                                    826584.393 8203X                            FJ-GSSX-038                                                                                                                                                                                                                             194175.763                                                                                                                                                                                                                                                                    826613.675 8203X                            FJ-GSSX-039                                                                                                                                                                                                                                       194145.48                                                                                                                                                                                                                                                                                                   826596.885 8203X                            FJ-GSSX-040                                                                                                                                                                                                                             194152.878                                                                                                                                                                                                                                                                    826613.151

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Sample ID                                                                         Northing                                                                        Easting 8203X                            FJ-GSSX-041                                                                                                                                                                                                                             194150.586                                                                                                                                                                                                                                                                    826624.968 8203X                            FJ-GSSX-042                                                                                                                                                                                                                             194156.269                                                                                                                                                                                                                                                                    826628.457 8203X                            FJ-GSSX-043                                                                                                                                                                                                                             194168.938                                                                                                                                                                                                                                                                    826636.035 8203X                            FJ-GSSX-044                                                                                                                                                                                                                             194141.812                                                                                                                                                                                                                                                                    826637.231 8203X                            FJ-GSSX-045                                                                                                                                                                                                                             194120.871                                                                                                                                                                                                                                                                    826610.334 8203X                            FJ-GSSA-046                                                                                                                                                                                                                                       194116.47                                                                                                                                                                                                                                                                                                             826622.78 8203X                            FJ-GSSX-047                                                                                                                                                                                                                             194095.971                                                                                                                                                                                                                                                                    826616.629 8203X                            FJ-GSSX-048                                                                                                                                                                                                                             194037.964                                                                                                                                                                                                                                                                    826606.049 8203X                            FJ-GSSX-049                                                                                                                                                                                                                                                 193993.2                                                                                                                                                                                                                                                                                         826627.951

The implementation of quality control (QC)            measures as referenced by Section 5.6.3 of the LTP and FCSD                                                           -RA-                                                                  LT-100,                                                           Quality Assurance Project Plan for the License Termination Plan Development, Site Characterization and Final Status Survey Projects at Fort Calhoun Station (QAPP; Reference8                                                                  ) includes the collection of a soil sample for split sample analysis on 5%
of the soil samples taken in a survey unit with the locations selected at random. Eight soil samples, 8203X                     FQ-GSSX-005, 8203X-3-FR-GSSB-013, 8203X-3-FQ-GSSX-019, 8203X FJ-GSSB-023, 8203X-3-FJ-GSSB-031, 8203X-3-FQ-GSSX-035, 8203X                                  FQ-GSSX-040, and 8203X-3-FJ-GSSB-046 weredesignated                                  for split             or duplicate sample             QC analysis for the FSS of Survey Unit 8203.
Section 5.3.4 and Table 5                                                            -20 of the LTP                                                             specify that for Class                             3 open land survey units, surface scans will be performed on a judgmental percentage of the surface area in the survey unit            . For Survey Unit 8203, 10% scan coveragewas selected                                                                                                                                              , which equals 9,918 m                                                      2.
For this Class 3 open land survey unit, the Investigation Levels for area scanning and soil sample measurement results are those levels specified in  the Table 5           -24 of the LTP and are reproduced below inTable                                     5-4.

Table 5 Investigation Levels Classification                                                                                Scan Investigation Levels                                                                                                      Direct Investigation Levels

Class 3                                                                                                                                                       >Operational DCGL or >MDCscan if MDCscan is greater than Operational DCGL                                                                                                                                                                                                                                              >0.5 Operational DCGL

Table 5-5 provides a synopsis of the survey design for Survey Unit 8203.

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Table 5 Synopsis of Survey Design Feature                                                 Design Criteria                                                          Basis Survey Unit Surface Area                                                     99,184 m        2                                                   GPS

Number of Random Samples                                                              14                                    *                                        / = 3 (adjusted)
(N)
* MARSSIM Table 5.5
* Co-60:                1.06 pCi/g
* Cs-137:                3.65 pCi/g Operational DCGLs for surface DCGLs
* Eu-152:                2.36 pCi/g      soil, LTP, Table 5-8
* C-14:                                                15.9 pCi/g Scan and Direct Investigation                                                                                                                                   24 Levels                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Table 5-4                                                                                                                                                                                                                                                                                                                                                                                                        LTP, Table 5-Scan Areal Coverage                                    9,918 m2, 10% areal coverage                                               LTP, Table 5-20

Judgmental Samples                                                               1                                              Per Survey Design 35                                          Actual Number Obtained HTD                                ROC Analysis                                                                                                                                                                                                                                                                                                                                                                                                                          100% LTP, Section 5.2.6.2 49                                     Number of Samples Analyzed 1 duplicate and 1 split sample                                          LTP, Section 5.6.3 QC                                               selected at random                                        Actual Number Obtained 8
: 6.                                                                                      SURVEY IMPLEMENTATION

For Survey Unit 8203, compliance with the unrestricted release criteria was demonstrated through a combination of s                                                                                                            oil scanning with a Ludlum Model 44-20 gamma detector                                                             and the sampling of soil for isotopic analysis .
A License Termination/Final Status Survey (LT/FSS) Supervisor performed a visual inspection and walk-down of the survey unit on December 15, 2021, prior to performing FSS. The purpose of the walk-down was to assess the physical condition of the survey unit, evaluate access points and travel paths, and identify potentially hazardous conditions. At the time of survey, the soil in the survey unit was dry and free of any considerable constraint for the collection of samples and scan measurements.
FSS field activities were conducted  under the FSS            sample plan and included DQOs, survey design, detailed FSS instructions, job safety analysis, and related procedures for reference. FSS field activities were projected to take 10 working days to complete. Daily briefings were conducted to discuss the expectations for job performance and to review the            safety aspects of the

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job. A Field Log                                                                        was used to document field activities and other information pertaining to the performance of the FSS. FSS field activities commenced on                          January 11, 2022, and concluded on January 19, 2022.
A total of 13 different scan                              areas were scanned using a Ludlum Model 3001 paired with a Ludlum Model 44-20 (3 x 3) sodium iodide (NaI) detector                                                                         and Trimble GPS            unit. The background was established as the average of five  one-minute static measurements, while maintaining the detector 6 from the soil. In     Survey Unit 8203, background ranged from 26,680 cpm up to 30,060 cpm.
All designated scan areas were scanned using  the Model 44-20 detector operated in the rate-meter mode and using audio response. The probe was positioned no more than 2 from the ground and was moved at a scan speed of approximately 0.25 m per second. In accordance with FCSD-RA-LT-213, Operation of the Ludlum Model 3001 & Associated Detectors                                                           (            Reference 9), scan MDC was sufficient to detect residual radioactivity at the action level. Complete scan results are provided in Attachment 2.
The 14 random sample locations were marked with             flags based on GPS coordinates provided.
Each soil sample consisted of approximately 1 liter of soil. The soil sample media was sifted to remove stones and other media larger than 1 centimeter in diameter. All soil             samples were collected, controlled, transported, stored, and transferred to the on                                                -site laboratory using the chain-of-custody process from FCSD           -RA-                                                                  LT-205,                                                           Chain-of-Custody Protocol for Site Characterization and Final Status Survey  (Reference10), and in accordance with FCSD                                                                                                                                                      -RA-LT-203,                                                           Sample Media Collection for Site Characterization and Final Status Survey (Reference                                           11)                                                 and FCSD                                                           -RA-                                                                  LT-204,                                                           Sample Media Preparation for Site Characterization and Final Status Survey  (Reference12).
The survey design specified that 100% of the             samples were required for the HTD ROC analysis.
In total, 49 samples were selected for HTD radionuclide analysis.
The implementation of survey specific QC measures included the collection of eight samples (8203X-3-FQ-GSSX-005, 8203X-3-FR-GSSB-013, 8203X-3-FQ-GSSX-019, 8203X-3-FJ-GSSB-023, 8203X-3-FJ-GSSB-031, 8203X-3-FQ-GSSX-035, 8203X-3-FQ-FSSX-040, and 8203X-3-FJ-GSSB-046) for split                                                                         or duplicate sample analysis.
: 7.                                                                                      SURVEY RESULTS

The FSS            sample plan identifie            d multiple areas that needed to be             scanned for potentially                         elevated activity levels. By scanning 13 areas (                                                                                                                        Southwest, Large Middle, East, Southwest Middle, Southwest Corner, Dispersed Areas #1, Southeast Corner, Dispersed Areas #2, Far North, Middle, Bravo, Beehive, and Alpha) within accessible land , the 9,918 m2 scan requirement was

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achieved. Figure 16-1in Attachment                                                 1 presents the                                     Survey Unit 8203 Random Sample Locations.
Table 7-1provides an overview of the scan results for all 1                                     m2 scan areas around each             random sample location and the gamma walkovers. Attachment 2                        , Table                         16-1, provides the c                       omplete scan results.

Table 7 Synopsis of Scan Results

Min Scan                         Max Scan                            Action                          Scan Scan Area                                  Logged                            Logged                            Level                      Alarms?                       Investigation Reading                           Reading                            (cpm)                         (Y/N)                           Samples (cpm)                             (cpm) 1                                  26777                            32900                           30917                               Y                                  0 2                                  24847                            31300                           30917                               Y                                  0 3                                  27079                            34000                           30917                               Y                                  0 4                                  25812                            31600                           30917                               Y                                  0 5                                  24545                            29600                           30917                               N                                  0 6                                  24831                            32700                           31573                               Y                                  0 7                                  25269                            33100                           30917                               Y                                  0 8                                  26569                            32800                           30917                               Y                                  0 9                                  24650                            33200                           31573                               Y                                  0 10                                  27724                            31300                           31573                               N                                  0 11                                  25450                            31700                           30917                               Y                                  0 12                                  24967                            30200                           30917                               N                                  0 13                                  27604                            34700                           31573                               Y                                  0 14                                  26114                            33100                           30917                               Y                                  0 Alpha                                   26043                            31652                           28988                               Y                                  2 Beehive                                   22843                            35626                           29912                               Y                                  2 Bravo                                   25584                            32881                           29584                               Y                                  4 Dispersed Areas                                    25079                                                                                                                                                                      32017                                                                                                                                                                 30527                                                                                                                                                                                           Y                                                                                                                                                                                                                                                                               3
                 #1 Dispersed Areas                                    25549                                                                                                                                                                      41231                                                                                                                                                                 30445                                                                                                                                                                                           Y                                                                                                                                                                                                                                                                               6
                 #2 East                                  23687                            35143                           31737                               Y                                  3 Far North                                   23912                            33343                           28804                               Y                                  2 Large Middle                                    24666                            35174                           30938                               Y                                  3 Middle                                   27067                            37007                           31881                               Y                                  3 QC Walkover                                     22736                            32393                           28106                               Y                                  0 SE Corner                                    22121                            33091                           29132                               Y                                  2

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Min Scan                             Max Scan                               Action                              Scan Scan Area                                       Logged                               Logged                                Level                        Alarms?                          Investigation Reading                              Reading                               (cpm)                             (Y/N)                              Samples (cpm)                                (cpm)
South West                                         26036                               33046                               31532                                  Y                                      2 SW Corner                                          20014                               32246                               28208                                  Y                                      1 SW Middle                                          26248                               32503                               30507                                  Y                                      2

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For Survey Unit 8203 South W                                                                                                                        est Walkover, count rates ranged between 26,036 cpm and 33,046 cpm, with a mean count rate of 29,508                                                                         cpm and a standard deviation of 967 cpm. Figure 7-1 below presents a map of the gamma walkover for Survey Unit 8203 South West Walkover area.

Figure 7 Survey Unit 8203 South West Walkover                                                                                                                                                                                                                                       GPS Scan Results

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An evaluation of the Survey Unit 8203 South West data set was performed to assess the small areas of elevated activity which exceeded three standard  deviations above the mean measurement (i.e., +3 Z-Score). Two                         locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-2 and Figure 7-3 below present map                                                                                   s of the +3 Z-Score measurements within the             South West Walkover and the selected biased sampling locations.

Figure 7 Survey Unit 8203 South West                                                                                                                                                                                                               Walkover Z-                        Score Map

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Figure 7 Survey Unit 8203 South West Walkover                                                                                                                                                                                                                                       Z-ScoreandSample                                                                                                                         Locations Map (35 & 36)

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For the Survey Unit 8203 Large Middle Section Walkover                                    , count rates ranged between 24,666 cpm and 35,174 cpm, with a mean count rate of 29,535 cpm and a standard deviation of 1,451 cpm. Figure 7-4 below presents a map of the gamma walkover for the Survey Unit 8203 Large Middle Section Walkover.

Figure 7-4 -- Survey Unit 8203 Large Middle Section Walkover GPS Scan Results

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An evaluation of the Survey Unit 8203 Large Middle Section Walkover data set was performed to assessthe                                                                   small areas of elevated activity which exceeded three standard  deviations above the mean measurement. Three locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-5, Figure 7-6, and Figure 7-7 below present maps of the +3 Z-Score measurements within             the Survey Unit 8203 Large Middle Section Walkover and the selected biased sampling locations.

Figure 7 Survey Unit 8203 Large Middle Section Walkover Z                                                                                                                                                -Score Map

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Figure 7 Survey Unit 8203 Large Middle                                                                                                                         Section Walkover Z-                        Score andSample Locations Map (23)

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Figure 7 Survey Unit 8203 Large Middle                                                                                                                         Section Walkover Z-                        Score andSample Locations Map (24 & 25)

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For the Survey Unit 8203 East Walkover                                    , count rates ranged between 23,687 cpm and 35,143 cpm, with a mean count rate of  29,068 cpm and a standard deviation of 1,469 cpm. Figure                         7-8 below presents a map of the gamma walkover for the Survey Unit 8203 East Walkover                                                                                                                        .

Figure 7-8 -- Survey Unit 8203 East Walkover GPS Scan Results

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An evaluation of the Survey Unit 8203 East                                                             Walkover data set was performed to assessthe small areas of elevated activity which exceeded three standard  deviations above the mean measurement. Th            ree                                           locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-9and                                                Figure 7-10            below present maps of the +3 Z-Score measurements within             the Survey Unit 8203 East Walkover                                     and the selected biased sampling locations.

Figure 7 Survey Unit 8203 East Walkover Z-                        Score Map

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Figure 7 Survey Unit 8203 East Walkover Z-                        Score and Sample Locations Map (15-17)

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For the Survey Unit 8203 South West Middle Walkover area            , count rates ranged between 26,248 cpm and 32,503 cpm, with a mean count rate of 29,206 cpm and a standard deviation of 867 cpm. Figure 7-11below presents a map of the gamma walkover for                                                                                     the Survey Unit 8203 South West Middle Walkover area.

Figure 7-11 -- Survey Unit 8203 Southwest Middle Walkover GPS Scan Results

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An evaluation of the Survey Unit 8203 South West Middle Walkover data set was performed to assess the small areas of elevated activity which exceeded three standard                                                                                                                                   deviations above the mean measurement. Two locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure  7-12 and Figure 7-13 below present maps of the +3 Z-                                                Score measurements within the Survey Unit 8203 South West Middle Walkover and the selected biased sampling locations.

Figure 7-12 -- Survey Unit 8203 South W                                             est Middle Walkover Z                           -Score Map

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Figure 7 Survey Unit 8203 South West Middle Walkover Z                                                                                                                                                                                                                                      -Score and Sample Locations Map (33 & 34)

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For the Survey Unit 8203 South West Corner Walkover, count rates ranged between 20,014 cpm and 32,246 cpm, with a mean count rate of 26,789 cpm and a standard deviation of 1,707 cpm.
Figure 7-14 below presents a map of the gamma walkover for the Survey Unit 8203 South W                                                est Corner Walkover area.

Figure 7-14 -- Survey Unit 8203 South West Corner                                                                                                                                                                                                                            Walkover GPS Scan Results

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An evaluation of the Survey Unit 8203 South West Corner Walkover data set was performed to assess                                                                                                                      the small areas of elevated activity which exceeded three standard              deviations above the mean measurement. One location was selected for biased sample collection based on evaluation of the gamma walkover data. This                         biased location represented the maximum measurements encountered within the scan area. Figure 7-15and                                                                        Figure 7-            16 below present maps of the +3 Z-Score measurements within             the Survey Unit 8203 South West Corner Walkover and the selected biased sampling locations.

Figure 7-15 -- Survey Unit 8203 South West Corner                                                                                                                                                                                                                            Walkover Z-                        Score Map

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Figure 7-16 -- Survey Unit 8203 Southwest Corner                                                                                                                                     Walkover Z-                        Score andSample Locations Map (47)

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For the Survey Unit 8203 Disper                                    sed Areas #1 Walkover, count rates ranged between 25,079 cpm and 32,017 cpm, with a mean count rate of 2                                                                                                                                                                                                             8,622 cpm and a standard deviation of 964 cpm.
Figure 7-17 below presents a map of the gamma walkover for the Survey Unit 8203 Dispersed Areas #1 Walkover.

Figure 7 Survey Unit 8203 Dispersed Areas #1                                                                                                                         Walkover GPS Scan Results

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An evaluation of the                         Survey Unit 8203 Dispersed Areas #1                                                             Walkover data set was performed to assess                                                                                                                      the small areas of elevated activity which exceeded three standard              deviations above the mean measurement. Three locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-18,                                                            Figure 7-19           , and Figure 7-20 below present maps of the +3 Z-Score measurements within the             Survey Unit 8203 Dispersed Areas #1 Walkover and the selected biased sampling locations.

Figure 7 Survey Unit 8203 Dispersed Areas #1 Walkover Z                                                                                                                                                -Score Map

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Figure 7-19 -- Survey Unit 8203             Dispersed Areas #1 Walkover Z                        -ScoreandSample Locations Map (22)

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Figure 7-20 -- Survey Unit 8203 Dispersed Areas #1 Walkover                                                                                                                                                             Z-ScoreandSample Locations Map (31 & 32)

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For the Survey Unit 8203 Southeast Corner                                     Walkover, count rates ranged between 22,121 cpm and 33,091 cpm, with a mean count rate of 27,627 cpm and a standard deviation of 1,525 cpm.
Figure 7-21 below presents a map of the gamma walkover for the Southeast Corner                                                area.

Figure 7 Survey Unit 8203 Southeast Corner GPS Scan Results

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An evaluation of the Survey Unit 8203                                                Southeast Corner Walkover data set was performed to assess                                                                                                                      the small areas of elevated activity which exceeded three standard  deviations above the mean measurement. Two locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-22 and Figure 7-23 below present maps of the +3 Z-                                                Score measurements within the Survey Unit 8203 Southeast Corner Walkover and the selected biased sampling locations.

Figure 7 Survey Unit 8203 Southeast Corner Walkover Z-                        Score Map

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Figure 7 Survey Unit 8203 Southeast Corner Walkover Z-                        Score andSample                                                                  Locations Map (45 & 46)

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For the Survey Unit 8203 Dispersed Areas #2                                     Walkover, count rates ranged between 25,549 cpm and 41,231 cpm, with a mean count rate of 28,798 cpm and a standard deviation of 941 cpm.
Figure 7-24 below presents a map of the gamma walkover for the Dispersed Areas #2                                                            .

Figure 7 Survey Unit 8203 Dispersed Areas #2                                                                                                                         Walkover GPS Scan Results

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An evaluation of the Survey Unit 8203 Dispersed Areas #2                                                             Walkover data set was performed to assess                                                                                                                      the small areas of elevated activity which exceeded three standard              deviations above the mean measurement. Six locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-25, Figure 7-26, and Figure 7-27below present map                                                                                                                                                                                                s of the +3 Z-Score measurements within             the Survey Unit 8203 Dispersed Areas #2                                      Walkover and the selected biased sampling locations.

Figure 7 Survey Unit 8203 Dispersed Areas #2 Walkover Z                                                                                                                                                -Score Map

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Figure 7 Survey Unit 8203 Dispersed Areas #2 Walkover Z                                                                                                                                                -Score andSample Locations Map (18-21)

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Figure 7 Survey Unit 8203 Dispersed Areas #2 Walkover Z                                                                                                                                                -Score andSample Locations Map (26 & 27)

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For the Survey Unit 8203 Middle Walkover, count rates ranged between 27,067 cpm and 37,007 cpm, with a mean count rate of  30,304 cpm and a standard deviation of 881 cpm. Figure 7-28 below presents a map of the gamma walkover for the Survey Unit 8203 Middle Walkover.

Figure 7 Survey Unit 8203 Middle Walkover GPS Scan Results

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An evaluation of the Survey Unit 8203 Middle Walkover data set was performed to assess                                                                                                                       the small areas of elevated activity which exceeded three standard  deviations above the mean measurement. Three locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-29and                                                                        Figure 7-            30 below present map           s of the +3 Z-Score measurements within             the Survey Unit 8203 Middle Walkover and the selected biased sampling locations.

Figure 7 Survey Unit 8203 Middle Walkover Z-                        Score Map

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Figure 7 Survey Unit 8203 Middle Walkover Z-                        Score andSample                                                                  Locations Map             (28-30)

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For the Survey Unit 8203 Far North Walkover, count rates ranged between 23,912 cpm and 33,343 cpm, with a mean count rate of 27,250 cpm and a standard deviation of 835 cpm. Figure 7-31below presents a map                                                             of the gamma walkover for the Survey Unit 8203 Far North Walkover.

Figure 7 Survey Unit 8203 Far North                                                                                                                        Walkover GPS Scan Results

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An evaluation of the Survey Unit 8203 Far North Walkover data set was performed to                                       assess                                                                                                                      the small areas of elevated activity which exceeded three standard  deviations above the mean measurement. Two locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-32and                                                                        Figure 7-            33 below present map           s of the +3 Z-Score measurements within             the Survey Unit 8203 Far North                                     walkover and the selected biased sampling locations.

Figure 7 Survey Unit 8203 Far North Walkover Z-                        Score Map

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Figure 7 Survey Unit 8203 Far North Walkover Z-                        Score andSample                                                                  Locations Map (37 & 39)

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For the Survey Unit 8203 QCWalkover, count rates ranged between                                                                                                                    22,736 cpm and 32,393 cpm, with a mean count rate of  27,363 cpm and a standard deviation of 1,342 cpm. Figure                         7-34 below presents a map of the gamma walkover for              the Survey Unit 8203 QC Walkover.

Figure 7 Survey Unit 8203 QC Walkover GPS Scan                                                                                                                                                Results

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An evaluation of Survey Unit 8203 QC                                                                                                                        Walkover data set was performed to assessth                               e small areas of elevated activity which exceeded three standard  deviations above the mean measurement. Figure 7-35 below presents a map of the +3             Z-Score measurements.

Figure 7 Survey Unit 8203 QC Walkover Z-                        Score Map

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For the Survey Unit 8203 Bravo                                     Walkover, count rates ranged between             25,584 cpm and 32,881 cpm, with a mean count rate of  29,092 cpm and a standard deviation of 953 cpm. Figure 7-36 below presents a map of the gamma walkover for             the Survey Unit 8203 Bravo                                                                                                                         Walkover            .

Figure 7 Survey Unit 8203 Bravo Walkover GPS Scan Results

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An evaluation of the Survey Unit 82030 Bravo                                                                                     Walkover data set was performed to assess                                                                                                                                   the small areas of elevated activity which exceeded three standard  deviations above the mean measurement. Four locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-37, Figure 7-38, and Figure 7-39 below present map                                                                                                                                                                                                                                                                                     s of the +3 Z-Score measurements within             the Survey Unit 8203 Bravo                                     Walkover and the selected biased sampling locations.

Figure 7 Survey Unit 8203 Bravo Walkover Z-                        Score Map

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Figure 7 Survey Unit 8203 Bravo Walkover Z-                        Score andSample                                                                  Locations Map             (41-43)

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Figure 7 Survey Unit 8203 Bravo Walkover Z-                        Score                                           andSample                                                                  Locations Map             (44)

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For the Survey Unit 8203 Beehive Walkover, count rates ranged between 22,843 cpm and 35,626 cpm, with a mean count rate of 2                                                                                                                                                 8,635 cpm and a standard deviation of 1,501 cpm.
Figure 7-40 below presents a map of the gamma walkover for                                                             the Survey Unit 8203 Beehive area.

Figure 7 Survey Unit 8203 Beehive                                                                                                                         Walkover GPS Scan Results

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An evaluation of the Survey Unit 8203 Beehive Walkover data set was performed to assess                                                                                                                      the small areas of elevated activity which exceeded three standard  deviations above the mean measurement. Two locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-41and                                                                        Figure 7-            42 below present maps of the +3 Z-Score measurements within             the Survey Unit 8203 Beehive Walkover and the selected biased sampling locations.

Figure 7 Survey Unit 8203 Beehive Walkover Z-                        Score Map

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Figure 7 Survey Unit 8203 Beehive Walkover Z-                        Score andSample                                                                              Locations Map (48
                                                                                                                                                                         & 49)

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For the Survey Unit 8203 Alpha Walkover, count rates ranged between 26,043 cpm and 31,652 cpm, with a mean count rate of  28,536 cpm and a standard deviation of 900 cpm. Figure 7-43 below presents a map of the gamma walkover for              the Survey Unit 8203 Alpha Walkover.

Figure 7 Survey Unit 8203 Alpha                                                                                                                        Walkover GPS Scan Results

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An evaluation of the Survey Unit 8203 Alpha Walkover data set was performed to assessth                                                                                   e small areas of elevated activity which exceeded three standard  deviations above the mean measurement. Two                        locations were selected for biased sample collection based on evaluation of the gamma walkover data. These biased locations represented the maximum measurements encountered within the scan area. Figure 7-44and                                                                        Figure 7-            45 below present map           s of the +3 Z-Score measurements within             the Survey Unit 8203 Alpha Walkover and the selected biased sampling locations.

Figure 7 Survey Unit 8203 Alpha Walkover Z-                        Score Map

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Figure 7 Survey Unit 8203 Alpha Walkover Z-                        Score andSample                                                                  Locations Map             (38 &
40)

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The on-site laboratory analyzed the 14 soil samples taken for nonparametric statistical testing using the on-site gamma spectroscopy system. A summary of the results for the 14 samples collected for nonparametric statistical testing is provided in   Table 7-2. Gamma spectroscopy results revealed that             Cs-137 waspositively identifiedin                                                                                         10 random samples. No other ROCs were positively identified. The off-site laboratory, GEL Laboratories, analyzed the 14 random samples for the HTD ROC C-14. C-14 was detected in 1 of the 14 random samples.                                            The maximum operational sum of fractions (OpSOF) for random samples is             0.2420.
The basic statistics for the random sample population, as                                                compared to the BcDCGLs, and the survey unit dose aresummarized in                                               Table 7-3.
The SOF or unity rule is the mathematical test used to      assess compliance with radiological criteria for license termination when more than one radionuclide has been determined to be potentially present. The equation for the unity rule is:

Equation 7 Unity Rule C1                                                                                                                                                                                                                                                                                      +                                                                                                                                                                                                                                                                                                        DCGLC2+............Cn1 DCGL1                     DCGL2                                                 n Where:                                                                                                                                                                                                               Cn                                                                                                                                                             =                                 concentration of radionuclide n DCGLn                                                          =                                 DCGL of radionuclide n           .

Table 7-2 -- Summary of Gamma Spectroscopy Results and OpSOF Calculations for Samples Comprising the Statistical Sample Population Fraction Sample ID                                    ROC                       Activity                       OpDCGL                                       of                    OpSOF (pCi/g)                          (pCi/g)                        OpDCGL

Co-60                                                                         3.74E-03                                                                   1.06E+00                                                                          3.53E-03 8203X-3-FR-                                   Cs-137                                                               1.45E-01                                                                   3.65E+00                                                                          3.97E-02 0.07115 GSSX-001                                   Eu-152                                                              3.05E-02                                                                   2.36E+00                                                                          1.29E-02 C-14                                                                                     2.38E-01                                                                   1.59E+01                                                                          1.50E-02 Co-60                      1.16E-01                        1.06E+00                           1.09E-01 8203X-3-FR-                                   Cs-137                                                              5.96E-02                                                                  3.65E+00                                                                          1.63E-02 0.17153 GSSX-002                                   Eu-152                                                              1.08E-01                                                                   2.36E+00                                                                          4.58E-02 C-14                    0.00E+00                         1.59E+01                          0.00E+00 8203X-3-FR-                                    Co-60                                                                         8.45E-02                                                                   1.06E+00                                                                          7.97E-02                                                   0.12921 GSSX-003                                   Cs-137                                                              1.57E-01                                                                  3.65E+00                                                                          4.30E-02

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Activity                                 OpDCGL                                         Fraction Sample ID                                                  ROC                                 (pCi/g)                                    (pCi/g)                                               of                          OpSOF OpDCGL Eu-152                                                        0.00E+00                                                             2.36E+00                                                                     0.00E+00 C-14                                                                                     1.03E-01                                                                   1.59E+01                                                                          6.48E-03 Co-60                                                                   0.00E+00                                                             1.06E+00                                                                     0.00E+00 8203X-3-FR-                                                 Cs-137                             8.65E-02                                   3.65E+00                                                                       2.37E-02 0.04470 GSSX-004                                               Eu-152                                                        0.00E+00                                                          2.36E+00                                                                  0.00E+00 C-14                                                                                  3.34E-01                                                                1.59E+01                                                                       2.10E-02 Co-60                             5.60E-02                                   1.06E+00                                     5.28E-02 8203X-3-FR-                                                 Cs-137                                                               2.21E-01                                                                3.65E+00                                                                       6.05E-02 0.12225 GSSX-005                                               Eu-152                                                        0.00E+00                                                          2.36E+00                                                                  0.00E+00 C-14                                                                                  1.41E-01                                                                1.59E+01                                                                       8.87E-03 Co-60                             9.32E-02                                   1.06E+00                                     8.79E-02 8203X-3-FR-                                                 Cs-137                                                               1.29E-01                                                                3.65E+00                                                                       3.53E-02 0.15541 GSSX-006                                               Eu-152                                                        0.00E+00                                                          2.36E+00                                                                  0.00E+00 C-14                                                                                  5.11E-01                                                                1.59E+01                                                                       3.21E-02 Co-60                                                                         1.07E-02                                                                1.06E+00                                                                       1.01E-02 8203X-3-FR-                                                 Cs-137                             1.74E-01                                   3.65E+00                                                                       4.77E-02 0.07696 GSSX-007                                               Eu-152                              2.41E-03                                   2.36E+00                                     1.02E-03 C-14                                                                                  2.89E-01                                                                1.59E+01                                                                       1.82E-02 Co-60                                                                   0.00E+00                                                          1.06E+00                                                                  0.00E+00 8203X-3-FR-                                                 Cs-137                             5.84E-02                                   3.65E+00                                     1.60E-02                                0.02663 GSSX-008                                               Eu-152                                                        0.00E+00                                                          2.36E+00                                                                  0.00E+00 C-14                                                                                  1.69E-01                                                                1.59E+01                                                                       1.06E-02 Co-60                                                                   0.00E+00                                                          1.06E+00                                                                  0.00E+00 Cs-137                             2.20E-01                                   3.65E+00                                                                       6.03E-02 8203X-3-FR-                                                Eu-152                                                        0.00E+00                                                          2.36E+00                                                                  0.00E+00 0.08870 GSSX-009 C-14                                                                                  4.52E-01                                                                1.59E+01                                                                       2.84E-02

8203X-3-FR-                                                  Co-60                             8.11E-02                                   1.06E+00                                     7.65E-02                                0.16642 GSSX-010                                                Cs-137                                                              1.23E-01                                                                  3.65E+00                                                                          3.37E-02

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Activity                                    OpDCGL                                              Fraction Sample ID                                                        ROC                                    (pCi/g)                                        (pCi/g)                                                    of                             OpSOF OpDCGL Eu-152                                                              6.36E-02                                                                   2.36E+00                                                                          2.70E-02 C-14                                                                                     4.65E-01                                                                   1.59E+01                                                                          2.92E-02 Co-60                                                                   0.00E+00                                                             1.06E+00                                                                     0.00E+00 8203X-3-FR-                                                       Cs-137                                1.97E-01                                       3.65E+00                                                                       5.40E-02       0.17286 GSSX-011                                                     Eu-152                                                              2.35E-01                                                                2.36E+00                                                                       9.96E-02 C-14                                                                                  3.07E-01                                                                1.59E+01                                                                       1.93E-02 Co-60                                0.00E+00                                       1.06E+00                                         0.00E+00 8203X-3-FR-                                                       Cs-137                                                              2.92E-01                                                                  3.65E+00                                                                          8.00E-02 0.13006 GSSX-012                                                     Eu-152                                                        0.00E+00                                                             2.36E+00                                                                     0.00E+00 C-14                              7.96E-01                                       1.59E+01                                          5.01E-02 Co-60                                                                         1.78E-01                                                                1.06E+00                                                                       1.68E-01 8203X-3-FR-                                                       Cs-137                                                              1.36E-01                                                                  3.65E+00                                                                          3.73E-02 0.24198 GSSA-013                                                     Eu-152                                                        0.00E+00                                                             2.36E+00                                                                     0.00E+00 C-14                                                                                     5.85E-01                                                                   1.59E+01                                                                          3.68E-02 Co-60                                                                         9.18E-02                                                                   1.06E+00                                                                          8.66E-02 8203XX-3-FR-                                                         Cs-137                                3.51E-01                                       3.65E+00                                                                       9.62E-02       0.20833 GSSX-014                                                     Eu-152                                  5.11E-03                                      2.36E+00                                          2.17E-03 C-14                                                                                  3.72E-01                                                                1.59E+01                                                                       2.34E-02 Note: Bold values indicate concentrations greater than MDC.

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Table 7-3 -- Basic Statistical Properties of              Random Sample Populationand Survey Unit Dose Mean                            Median                                 Max                                   Min                              Std. Dev.                           BcDCGL                              Avg BcSOF                                  Avg Dose per ROC                          (pCi/g)                           (pCi/g)                           (pCi/g)                               (pCi/g)                                (pCi/g)                              (pCi/g)                              per ROC                                           ROC

Co-60                                                           5.11E-02                                                         3.34E-02                                                       1.78E-01                                                                        0.00E+00                                                                             5.73E-02                                                                3.77E+00                                                                                 1.35E-02                                                                                                                       3.39E-01 Cs-137                                                    1.68E-01                                                         1.51E-01                                                       3.51E-01                                                                            5.84E-02                                                                                  8.36E-02                                                                1.31E+01                                                                                 1.28E-02                                                                                                                       3.20E-01 Eu-152                                                    3.18E-02                                                    0.00E+00                                                  2.35E-01                                                                        0.00E+00                                                                             6.67E-02                                                                8.41E+00                                                                                 3.78E-03                                                                                                                       9.44E-02 C-14                                                                     3.40E-01                                                         3.21E-01                                                       7.96E-01                                                                        0.00E+00                                                                             2.11E-01                                                                5.70E+01                                                                                 5.97E-03                                                                                                                       1.49E-01

Mean base case sum of fractions (BcSOF                         ) =
0.0361 DOSE ASSIGNED TO SURVEY UNIT =
0.9026 mrem/yr

The on-site laboratory analyzed the 35 judgmental soil samples  using the on-site gamma spectroscopy system. A summary of the analytical results for the   judgmental soil samples is provided in Table 7-4. Gamma spectroscopy results revealed                                                 that Cs-137 was positively identified in 23 judgmental samples.                                                             No other ROCs were positively identified                                                                                                               .
GEL Laboratories analyzed the 35 judgmental samples for             the HTD ROC C-14. C-14 was not detected in any of the 35 judgmental             samples. The maximum OpSOF for judgmental samples is 0.2485.

Table 7-4 -- Summary of Gamma Spectroscopy Results              and OpSOF Calculations for Judgmental Samples Measured                                     OpDCGL                                      Fraction Sample ID                                                          ROC                                    Activity                                                                                         of                          OpSOF (pCi/g)                                      (pCi/g)                               OpDCGL

Co-60                                                                                                                 0.00E+00                                                                          1.06E+00                                                          0.00E+00 8203X-3-FJ              -GSSX-                                               Cs-137                                                                                                                                                                                1.01E-01                                                                                                                                        3.65E+00                                                               2.77E-02 0.11466 015                                                 Eu-152                                                                                                             1.90E-01                                                                                                                                         2.36E+00                                                               8.05E-02 C-14                                  1.03E-01                                    1.59E+01                                   6.48E-03 Co-60                                                                                                                       1.33E-01                                                                                                                                         1.06E+00                                                               1.25E-01 8203X-3-FJ              -GSSX-                                               Cs-137                                                                                                                                                                                 5.80E-02                                                                                                                                         3.65E+00                                                               1.59E-02 0.20205 016                                                 Eu-152                                                                                                             1.26E-01                                                                                                                                         2.36E+00                                                               5.34E-02 C-14                                                                                                                                                                                                            1.16E-01                                                                                                                                         1.59E+01                                                               7.30E-03

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Measured                                                        OpDCGL                                                         Fraction Sample ID                                                                                     ROC                                                     Activity                                                                                                                                 of                                       OpSOF (pCi/g)                                                         (pCi/g)                                              OpDCGL

Co-60                                                                                                                       1.99E-01                                                                                                                                         1.06E+00                                                               1.88E-01 8203X-3-FJ              -GSSX-                                                                                Cs-137                                                                                                                                                                                1.47E-01                                                                                                                                        3.65E+00                                                               4.03E-02 0.23329 017                                                                      Eu-152                                                   0.00E+00                                                        2.36E+00                                                    0.00E+00 C-14                                                 8.40E-02                                                       1.59E+01                                                     5.28E-03 Co-60                                                                                                                       1.21E-01                                                                                                                                         1.06E+00                                                               1.14E-01 Cs-137                                                                                                                                                                                9.38E-02                                                                                                                                        3.65E+00                                                               2.57E-02 8203X-3-FJ              -GSSX-                                                                               Eu-152                                                                                                        0.00E+00                                                                          2.36E+00                                                          0.00E+00 0.13985 018 C-14                                                                                                                                                                                                       0.00E+00                                                                          1.59E+01                                                          0.00E+00

Co-60                                                                                                                       5.32E-03                                                                                                                                         1.06E+00                                                               5.02E-03 8203X-3-FJ              -GSSX-                                                                                Cs-137                                                   1.85E-01                                                       3.65E+00                                                     5.07E-02                                                0.05570 019                                                                      Eu-152                                                                                                        0.00E+00                                                                          2.36E+00                                                          0.00E+00 C-14                                                                                                                                                                                                       0.00E+00                                                                          1.59E+01                                                          0.00E+00 Co-60                                                                                                                     1.14E-01                                                                                                                                         1.06E+00                                                               1.08E-01 8203X-3-FJ       -GSSX-                                                                                       Cs-137                                                                                                                                                                             1.77E-01                                                                                                                                        3.65E+00                                                               4.85E-02 0.15604 020                                                                      Eu-152                                                                                                        0.00E+00                                                                          2.36E+00                                                          0.00E+00 C-14                                                0.00E+00                                                        1.59E+01                                                    0.00E+00 Co-60                                                                                                                       1.17E-01                                                                                                                                         1.06E+00                                                               1.10E-01 8203X-3-FJ              -GSSX-                                                                                Cs-137                                                   1.73E-01                                                       3.65E+00                                                               4.74E-02                                      0.15777 021                                                                      Eu-152                                                                                                        0.00E+00                                                                          2.36E+00                                                          0.00E+00 C-14                                                                                                                                                                                                       0.00E+00                                                                          1.59E+01                                                          0.00E+00 Co-60                                                                                                                     4.11E-02                                                                                                                                         1.06E+00                                                               3.88E-02 8203X-3-FJ       -GSSX-                                                                                       Cs-137                                                                                                                                                                               2.40E-02                                                                                                                                         3.65E+00                                                               6.58E-03 0.04535 022                                                                      Eu-152                                                   0.00E+00                                                        2.36E+00                                                    0.00E+00 C-14}}