ML19338B788

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Restoration Project Final Status Survey Release Record 00150ABC, North Yard Storm Drain Buried Piping
ML19338B788
Person / Time
Site: Zion  File:ZionSolutions icon.png
Issue date: 11/23/2019
From: Graham J
ZionSolutions
To:
Office of Nuclear Material Safety and Safeguards
References
ZS-2019-0101
Download: ML19338B788 (41)
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Text

ZION STATION RESTORATION PROJECT FINAL STATUS SURVEY RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C PREPARED BY / DATE: J. Graham 2019-11-23 Radiological Engineer REVIEWED BY / DATE: G. Wood 2019-11-23 Radiological Engineer APPROVED BY / DATE: D. Wojtkowiak 2019-11-23 C/LT Manager

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C TABLE OF CONTENTS

1. EXECUTIVE

SUMMARY

................................................................................................... 6

2. SURVEY UNIT DESCRIPTION ......................................................................................... 7
3. CLASSIFICATION BASIS .................................................................................................. 7
4. DATA QUALITY OBJECTIVES ........................................................................................ 8
5. SURVEY DESIGN .............................................................................................................. 11
6. SURVEY IMPLEMENTATION........................................................................................ 16
7. SURVEY RESULTS............................................................................................................ 17
8. QUALITY CONTROL ....................................................................................................... 20
9. INVESTIGATIONS AND RESULTS ............................................................................... 20
10. REMEDIATION AND RESULTS ..................................................................................... 20
11. CHANGES FROM THE SURVEY PLAN ....................................................................... 20
12. DATA QUALITY ASSESSMENT ..................................................................................... 20
13. ANOMALIES....................................................................................................................... 21
14. CONCLUSION .................................................................................................................... 21
15. REFERENCES .................................................................................................................... 21
16. ATTACHMENTS ................................................................................................................ 22 ATTACHMENT 1 - SURVEY UNIT 00150A/B & C - STORM DRAIN PIPING DRAWING ......... 23 ATTACHMENT 2 - SAMPLE DATA....................................................................................... 25 ATTACHMENT 3 - SIGN TEST ............................................................................................. 35 ATTACHMENT 4 - QC DATA ASSESSMENT ........................................................................ 40

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C LIST OF TABLES Table 1 - Dose Significant Radionuclides and Mixture.......................................................................... 10 Table 2 - Base Case and Operational DCGLs for Buried Pipe............................................................... 11 Table 3 - Surrogate Ratios ...................................................................................................................... 11 Table 4 - Normalized Mixture for Gamma-Emitting ROC .................................................................... 13 Table 5 - Synopsis of Survey Design ..................................................................................................... 15 Table 6 - Instruments and Detectors ....................................................................................................... 17 Table 7 - North Yard Storm Drain Buried Pipe - Statistical Quantities ................................................. 19 LIST OF ACRONYMS AND ABBREVIATIONS ALARA As Low As Reasonably Achievable AMCG Average Member of the Critical Group BcDCGL Base Case Derived Concentration Guideline Level BcSOF Base Case Sum of Fractions C/LT Characterization/License Termination DQO Data Quality Objective DCGL Derived Concentration Guideline Level FOV Field of View FSS Final Status Survey HTD Hard-to-Detect ID Internal Diameter LTP License Termination Plan MARSSIM Multi-Agency Radiation Survey and Site Investigation Manual MDC Minimum Detectable Concentration NaI Sodium Iodide NORM Naturally Occurring Radioactive Material OD Outside Diameter OpDCGL Operational Derived Concentration Guideline Level OpSOF Operational Sum of Fractions

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C QAPP Quality Assurance Project Plan QC Quality Control RE Radiological Engineer ROC Radionuclides of Concern SOF Sum of Fractions TEDE Total Effective Dose Equivalent TSD Technical Support Document UCL Upper Confidence Level ZNPS Zion Nuclear Power Station ZSRP Zion Station Restoration Project

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C

1. EXECUTIVE

SUMMARY

This Final Status Survey (FSS) Release Record for survey unit 00150A/B and C North Yard Storm Drain Buried Piping, has been generated for the Zion Station Restoration Project (ZSRP) in accordance with ZionSolutions procedure ZS-LT-300-001-005, Final Status Survey Data Reporting (Reference 1) and satisfies the requirements of Section 5.11 of the Zion Station Restoration Project License Termination Plan (LTP) (Reference 2).

Three (3) FSS packages (package nos. S2-00150A-F, S2-00150B-F and S2-00150C-F) were developed in accordance with ZionSolutions procedure ZS-LT-300-001-001, Final Status Survey Package Development (Reference 3), the ZSRP LTP, and guidance from NUREG-1575, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM)

(Reference 4).

FSS was conducted to demonstrate that the concentrations of residual radioactivity are equal to or below site-specific Derived Concentration Guideline Levels (DCGL) corresponding to the dose criterion in 10 CFR 20.1402 Radiological Criteria for Unrestricted Use. The North Yard Storm Drain buried piping was classified as MARSSIM Class 2.

The North Yard Storm Drain buried piping consists of various length of buried storm water pipe with varying Internal Diameters (ID) including approximately 135 linear feet (41.1 meters) of 6-inch ID pipe, approximately 550 linear feet (168 meters) of 8-inch ID pipe, approximately 119 linear feet (36.2 meters) of 12-inch ID pipe, approximately 115 linear feet (35.1 meters) of 15-inch ID pipe, and approximately 363 linear feet (110.6 meters) of 16-inch ID buried pipe. This totaled approximately 1,282 linear feet of pipe. Of the total of 1,282 linear feet of pipe buried pipe, it was decided to remove and replace (with clean pipe) the 363 feet of 16-inch ID pipe. This reduced the overall length of pipe to undergo FSS from 1,282 linear feet to 919 linear feet.

The initial surveys of the North Yard Storm Drain ID buried piping was performed using a Ludlum Model 2350-1 Data Logger paired with a Ludlum Model 44-157 sodium iodide (NaI) gamma detector. To minimize the contribution of background radiation on the dose calculation for the survey unit, these surveys were re-performed and subsequent FSS was performed with the Ludlum Model 2350-1 Data Logger paired with a Ludlum Model 44-10 NaI gamma detector calibrated to the Cs-137 energy window. The evaluation performed in this release record is based on the survey data collected using the Ludlum Model 44-10 calibrated to the Cs-137 energy window.

One-minute static measurements were taken to quantify the activity in the pipe. Each measurement had a calculated Field of View (FOV) based on the ID of the pipe surveyed (FOV area of 1.57 ft2 for a 6-inch ID pipe, 2.09 ft2 for an 8-inch ID pipe, 3.14 ft2 for a 12-inch ID pipe and 3.93 ft2 for a 15-inch ID pipe). The total length of the piping of this survey unit was 919 linear feet.

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C For the FSS of the North Yard Storm Drain buried piping, 272 readings were obtained. All of the readings were below a Sum of Fractions (SOF) of 1.0 for the Operational DCGLs for Buried Pipe (OpDCGLBP), with a mean Operational SOF (OpSOF) of 0.107. The mean Base Case SOF (BcSOF), when compared to the Base Case DCGLs for Buried Pipe (BcDCGLBP),

was 0.027, which results in the dose for this survey unit of 0.683 mrem/yr.

2. SURVEY UNIT DESCRIPTION Section A of survey unit 00150A consisted of the buried 6-inch ID storm drain pipe that runs from the north end of the electrical switchyard to the open drainage ditch located in the southern portions of open land survey areas 10212 and 10213, flowing west to east into Lake Michigan. A second header is also located along the site access road in open land survey area 10214. This header ties into the west/east header under the site parking lot. The storm drain system itself consisted of 6-inch ID smooth wall steel pipe that was approximately 135 linear feet in length. This equated to an internal surface area of approximately 212 ft2.

Section B of survey unit 00150B, consisted of the buried 8-inch ID PVC storm drain that was located along the access road north of the Protected Area and was approximately 515 linear feet in length, which equated to a surface area of 1,079 ft2. This piping connected Catch Basin (CB)-1 to CB-6.

Section C of survey unit 00150C, consisted of the buried 8-inch, 12-inch and 15-inch ID piping that was located along the side of the access road north of the Protected Area. The pipe was in three sections that totaled approximately 269 linear feet of pipe. A description of each pipe section is as follows:

  • The 8-inch ID PVC pipe ran from CB-7 to a capped off section of pipe. This section was approximately 35 linear feet in length, which equated to a surface area of 73 ft2.
  • The 12-inch ID smooth steel wall piping ran from CB-6 to CB-7. This section of pipe was approximately 119 linear feet in length, which equated to a surface area of 374 ft2.
  • The 15-inch corrugated steel piping ran from the West Ditch to CB-7. This section of pipe was approximately 115 linear feet in length, which equated to a surface area of 452 ft2.
3. CLASSIFICATION BASIS On May 7, 2019, as part of an FSS surveillance performed on the north portion of the Switchyard open land survey unit (10205) in accordance with ZionSolutions procedure ZS-LT-300-001-003, Isolation and Control for Final Status Survey (Reference 5),

Characterization/License Termination (C/LT) Technicians collected sediment samples from the bottom of manhole access points to the Switchyard storm drain. Both storm drain systems were initially classified as non-impacted based on information taken from the Zion Station Historical Site Assessment (Reference 6). In the sediment sample collected from the west

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C access point (L2-10214C-RJGS-001-SM), both Cs-137 and Co-60 were positively detected at concentrations of 2.22E+00 pCi/g and 1.80E-01 pCi/g respectively. Consequently, the discovery prompted a change of classification in accordance with ZionSolutions procedure ZS-LT-300-001-002, Survey Unit Classification (Reference 7). This storm drain, which had previously been classified as non-impacted, was reclassified as a MARSSIM Class 2 buried pipe and subject to compliance demonstration as required by LTP Chapter 5, section 5.7.1.9.

License Termination Plan Chapter 5, section 5 states, The list of buried piping, penetrations and embedded piping to remain is provided in ZionSolutions TSD 14-016, Description of Embedded Pipe [sic, Piping], Penetrations, and Buried Pipe to Remain in Zion End State (Reference 5-8). The list of end-state embedded pipe, buried pipe and penetrations presented in Attachment F to TSD 14-016 is intended to be a bounding end-state condition. No pipe that is not listed in Attachment F will be added to the end-state condition however, pipe can be removed from the list and disposed of as waste.

Technical Support Document (TSD)14-016 is Reference 8 in this Release Record. Since this section of storm drain (approximately 1,282 feet of piping) was previously classified as non-impacted, it was not included in Attachment F of TSD 14-016, identifying it as impacted buried piping that will remain. Section 5 of the LTP Revision 2 stated that no additional piping will be added to the impacted piping list as identified in Attachment F of TSD 14-016. It has been determined that leaving the storm drain piping does not adversely impact the release of the impacted area. Therefore, the LTP and TSD have been revised to reflect the acceptability of the pipe reclassification. ZionSolutions notified the NRC in June 2019 of the storm drain piping reclassification. A figure showing the location of the storm drain piping is included in Attachment 1.

A Radiological Engineer (RE) and a C/LT Supervisor performed a visual inspection and walk-down of the survey unit on June 17, 2019 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. A final classification assessment was performed in accordance with procedure ZS-LT-300-001-002 as part of the survey design for FSS. The assessment confirmed that survey unit 00150A/B & C was correctly classified as MARSSIM Class 2.

4. DATA QUALITY OBJECTIVES Final Status Survey planning and design hinges on coherence with the 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 is described in the ZSRP

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C LTP in accordance with MARSSIM. The appropriate design for a given survey is developed using the DQO process as outlined in Appendix D of MARSSIM.

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 that sufficient evidence must be provided for rejection. 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 00150A/B & C does not exceed the release criteria specified in the LTP and that the potential dose from residual radioactivity is As Low As Reasonably Achievable (ALARA).

The residual radioactivity in buried piping located below the 588 foot grade that will remain and be subjected to FSS is discussed in LTP Chapter 2, section 2.3.3.7 and TSD 14-016. The dose assessment methods and resulting DCGLs for buried piping are described in detail in TSD 14-015, Buried Pipe Dose Modeling & DCGLs (Reference 9) and LTP Chapter 6, section 6.12.

ZionSolutions TSD 11-001, Technical Support Document for Potential Radionuclides of Concern During the Decommissioning of the Zion Station (Reference 10) established the basis for an initial suite of potential Radionuclides of Concern (ROC) for the decommissioning of the Zion Nuclear Power Station (ZNPS). LTP Chapter 2 provides detailed characterization data that described contamination levels in the Containments and Auxiliary Building, which were the primary source of radioactive contaminants. ZionSolutions TSD 14-019, Radionuclides of Concern for Soil and Basement Fill Model Source Terms (Reference 11) evaluates the results of the concrete core analysis data from the Containments and Auxiliary Building and refines the initial suite of potential ROC by evaluating the dose significance of each radionuclide.

The final ROC for the decommissioning of Zion are Co-60, Cs-134 and Cs-137 (as well as Eu-152 and Eu-154 for Containment), which are gamma emitters, and Ni-63 and Sr-90 (as well as H-3 for Containment), which are Hard-to-Detect (HTD) radionuclides. LTP section 5.1 states that HTD concentrations will be inferred using a surrogate approach and the maximum ratios from LTP Chapter 5, Table 5-15 unless area-specific ratios as determined by actual survey data are used in lieu of the maximum ratios.

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C LTP Chapter 6, section 6.5.2 discusses the process used to derive the ROC for the decommissioning of the ZNPS, including the elimination of insignificant dose contributors from the initial suite consistent with the guidance in Section 3.3 of NUREG-1757. Based upon the analysis of the Auxiliary Building mixture in TSD 14-019, Table 19, it was determined that Co-60, Ni-63, Sr-90, Cs-134 and Cs-137 accounted for 99.5% of all dose in the contaminated concrete mixes. Table 1 presents the ROC for the decommissioning of Auxiliary Building structural surfaces and the normalized mixture fractions based on the radionuclide mixture. In accordance with LTP Chapter 5, section 5.1, it was determined that the suite of ROC and radionuclide mixture derived for the Auxiliary Building concrete was considered as a reasonably conservative mixture to apply to soils and buried piping for FSS planning and implementation.

Table 1 - Dose Significant Radionuclides and Mixture

% of Total Activity Radionuclide (normalized)(1)

Co-60 0.92%

Cs-134 0.01%

Cs-137 75.32%

Ni-63 23.71%

Sr-90 0.05%

(1) Based on maximum percent of total activity from Table 20 of TSD 14-019, normalized to one for the dose significant radionuclides.

At ZNPS, compliance is demonstrated through the summation of dose from four distinct source terms for the end-state (basements, soils, buried pipe and groundwater). 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 per year to an Average Member of the Critical Group (AMCG). To ensure that the summation of dose from each source term is 25 mrem/year or less after all FSS is completed, the BcDCGLs are reduced based on an expected, or a priori, fraction of the 25 mrem/year dose limit from each source term. The reduced DCGLs, or Operational DCGLs 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, investigations levels, etc.). Details of the OpDCGLs derived for each dose component and the basis for the applied a priori dose fractions are provided in ZionSolutions TSD 17-004, Operational Derived Concentration Guideline Levels for Final Status Survey (Reference 12).

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C The Base Case and Operational DCGLs for Buried Pipe are listed in Tables 5-9 and 5-10 of the LTP, and are reproduced in Table 2.

Table 2 - Base Case and Operational DCGLs for Buried Pipe Base Case Operational Radionuclide Buried Pipe DCGL Buried Pipe DCGL 2

dpm/100cm dpm/100cm2 Co-60 2.64E+04 6.76E+03 Cs-134 4.54E+04 1.16E+04 Cs-137 1.01E+05 2.59E+04 Ni-63 4.89E+07 1.25E+07 Sr-90 4.50E+04 1.15E+04

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 ZS-LT-300-001-001.

The DQO process determined that Co-60, Ni-63, Sr-90, Cs-134 and Cs-137 would be the ROC in survey unit 00150A/B & C. During FSS, concentrations for HTD ROC Ni-63 and Sr-90 were inferred using a surrogate approach. Cs-137 was the principle surrogate radionuclide for Sr-90 and Co-60 was the principle surrogate radionuclide for Ni-63. The mean, maximum and 95% Upper Confidence Level (UCL) of the surrogate ratios for concrete core samples taken in the Auxiliary Building basement were calculated in ZionSolutions TSD 14-019 and are presented in Table 3. The maximum ratios were used in the surrogate calculations during this FSS. The results of the surrogate calculations are listed in Table 4.

Table 3 - Surrogate Ratios Auxiliary Building Ratios Mean Max 95%UCL Ni-63/Co-60 44.143 180.450 154.632 Sr-90/Cs-137 0.001 0.002 0.002

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C The equation for calculating a surrogate DCGL is as follows:

Equation 1 1

=

1 2 3

+ + +

2 3 Where: DCGLSur = Surrogate radionuclide DCGL DCGL2,3n = DCGL for radionuclides to be represented by the surrogate Rn = Ratio of concentration (or nuclide mixture fraction) of radionuclide n to surrogate radionuclide Using the OpDCGLs for buried pipe presented in Table 2 and the maximum ratios from Table 3, the following surrogate calculations for buried pipe were performed:

Equation 2 1

(137) = = 2.584 /100 2 1 0.002 2.594 +

(137) 1.154(90)

The surrogate OpDCGL for buried pipe that was used for Cs-137 in this survey unit is 2.58E+04 dpm/100cm2.

Equation 3 1

(60) = = 6.163 /1002 1 180.45 6.763 +

(60) 1.257(63)

The surrogate OpDCGL for buried pipe that was used for Co-60 in this survey unit is 6.16E+03 dpm/100 cm2.

An adjusted gross gamma Operational DCGL was also calculated by applying the normalized gamma mixture for the three gamma-emitting ROC to the surrogate Co-60 OpDCGL, the surrogate Cs-137 OpDCGL and the OpDCGL for Cs-134 from Table 2.

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C The normalized values are:

Table 4 - Normalized Mixture for Gamma-Emitting ROC Auxiliary Building Radionuclide

% of Total Activity (normalized)

Co-60 1.21%

Cs-134 0.01%

Cs-137 98.78%

The equation for performing a gross activity calculation is as follows:

Equation 4 1

=

1 2 1 + 2 + 1 The equation for the gross gamma activity calculation is as follows:

Equation 5 1

= = 2.484 /1002

. 9878 . 0121 . 0001

+ +

2.584 6.163 1.164 The adjusted gross gamma OpDCGL for buried pipe is 2.48E+04 dpm/100 cm2.

For the survey of pipe internal surfaces, areal coverage is achieved by the area of detection for each static measurement taken. Scanning, in the traditional context, is not applicable to the survey of pipe internal surfaces. It is conservatively assumed that one static measurement provides a full field of view over the 1-foot segment for these pipe sizes. This assumption is conservative because there is additional instrument response from contamination located in the pipe at distances outside of one (1) foot. Each foot of 6-inch ID pipe has a FOV area of 1.57 ft2, each foot of 8-inch ID pipe has a FOV area of 2.09 ft2, each foot of 12-inch ID pipe has a FOV area of 3.14 ft2 and each foot of 15-inch ID pipe has a FOV area of 3.93 ft2; which is considered as the FOV for the measurements taken inside the pipe for this survey.

The buried North Yard Storm Drain piping was classified as MARSSIM Class 2 buried pipe.

The initial survey design for the FSS of the North Yard Storm Drain buried piping was to be performed with a Ludlum Model 2350-1 Data Logger paired with a Ludlum Model 44-157 NaI gamma detector. Background was not subtracted from the readings. For this survey design, a minimum of 25% areal coverage was required. For the survey of these pipes, the pipe detector was calibrated for the specific geometry of the various diameters of the storm drain pipes.

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C To minimize the contribution of background radiation on the dose calculation for the survey unit, a second survey was performed with the Ludlum Model 2350-1 Data Logger paired with a Ludlum Model 44-10 NaI gamma detector calibrated to the Cs-137 energy window. The evaluations performed in this release record are based on the survey data collected using the Ludlum Model 44-10 calibrated to the Cs-137 energy window.

In compliance with ZS-LT-01, Quality Assurance Project Plan (for Characterization and FSS) (QAPP) (Reference 13), replicate measurements were required at 5% of the static measurement locations.

For the Ludlum Model 44-10 detector windowed for the Cs-137 energy, a 2nd surrogate calculation was performed, with Cs-137 as the surrogate for Co-60 and Cs-134.

Equation 6 1

(137) = = 2.454 /1002 1 0.0001012 0.01225

+ +

2.584(137) 1.164(134) 6.163(60)

The surrogate OpDCGL for buried pipe that was used for surveys with the Ludlum Model 44-10 detector windowed for the Cs-137 energy was 2.45E+04 dpm/100cm2. Table 5 provides a synopsis of the survey design for survey unit 00150A/B & C.

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C Table 5 - Synopsis of Survey Design FEATURE DESIGN CRITERIA BASIS Pipe diameter (ID) x 919 linear ft Survey Unit Area 2,187 ft2 (length) x Number of Static 272 25% areal coverage, Class 2 Measurements As needed to obtain a sufficient number Measurement of measurements for 25% areal 25% areal coverage, Class 2 Spacing coverage

  • Co 6.76E+03 dpm/100cm2
  • Cs-134 - 1.16E+04 dpm/100cm2 OpDCGL for Buried Pipe, DCGLs
  • Cs-137 - 2.59E+04 dpm/100cm2 (LTP Chapter 5, Table 5-10)

Ni 1.25E+07 dpm/100cm2

  • Sr 1.15E+04 dpm/100cm2 Gross Gamma DCGL adjusted for HTD HTD ROC Analysis LTP 5.7.1.9 based on the isotopic mixture Measurement Gross Gamma Operational DCGL (LTP Chapter 5, Table 5-25)

Investigation Level Cs-137 Surrogate Operational DCGL Scan Survey Area N/A LTP 5.7.1.9 Coverage Replicate measurements will be Quality Control performed on 5% of the static QAPP (QC) measurement locations

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C

6. SURVEY IMPLEMENTATION Survey instructions for this FSS were incorporated into and performed in accordance with FSS Sample Plans S2-00150A-F, S2-00150B-F and S2-00150C-F, which were developed in accordance with ZionSolutions procedure ZS-LT-300-001-001. The FSS unit was inspected and controlled in accordance with ZionSolutions procedure ZS-LT-300-001-003.

Inspections of the pipe were performed with the SeeSnake prior to the start of the survey.

A background value was determined for the detector/instrument combination to be used prior to deployment. The background value was obtained at the location where the pre-use response check of the instrument was performed. The background value was primarily used to ensure that the detector had not become cross-contaminated by any previous use. Background was not subtracted from any measurement.

Daily, prior to and following use, each detector was subjected to an Operational Response Check in accordance with procedure ZS-LT-300-001-006, Radiation Surveys of Pipe Interiors Using Sodium/Cesium Iodide Detectors (Reference 14). The Daily Operational Response Check compared the background response and the response to check sources to ranges established for normal background and source response to ensure that the detector was working properly.

FSS field activities were conducted under the following three (3) FSS Sample Plans:

  • S2-00150A-F included the 6-inch ID steel smooth wall piping from CB-1 to CB-8 and CB-8 to CB-9. These sections have a combined length of 135 linear feet.
  • S2-00150B-F included the 8-inch ID PVC smooth wall piping from CB-1 to CB-6.

This section is 515 linear feet in length.

  • S2-00150C-F included three sections of pipe:

o 8-inch ID PVC pipe runs from Catch Basin 7 south to a capped end. This section is 35 linear feet in length.

o 12-inch ID smooth steel wall piping runs from CB-6 to CB-7. This section is 119 linear feet in length.

o 15-inch corrugated steel piping runs from the West Ditch to CB-7. This section is 115 linear feet in length.

A Field Log (ZS-LT-300-001-001 Attachment 14) was used to document field activities and other information pertaining to the performance of the FSS.

FSS field activities were projected to take eight (8) working days to complete for each of the three survey plans. Daily briefings were conducted to discuss the expectations for job performance and to review safety aspects of the job. The initial survey with the Ludlum Model 44-157 detector was performed during normal working hours on June 19, 2019 on the 6-inch piping running from CB-8 to CB-9 and from CB-8 to CB-1. A survey was also performed on

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C the 77 foot section of 8-inch pipe from CB-1 to CB-2. The results of the survey on the 8-inch pipe indicated gross activity at concentration levels above the Action Level (OpDCGL).

Investigations indicated that the elevated activity was due to Naturally Occurring Radioactive Material (NORM) that was present in the soil surrounding the buried pipe. In order to minimize the contribution of the NORM on the gross readings, the survey design was revised to allow resurvey of this pipe using a Ludlum Model 44-10 NaI detector calibrated to the energy window for Cs-137. Addendum 2 to survey plans S2-00150A-F and S2-00150B-F were written on June 25, 2019. Survey plan S2-00150C-F, written on July 1, 2019, included instructions for performing surveys with the Cs-137 windowed detector.

The surveys of the storm drain piping with the Cs-137 window commenced June 25, 2019 and completed July 23, 2019. Two hundred seventy-two (272) static measurements were obtained from within the pipe in several sections. Forty-five (45) measurements were taken in the 6-inch ID pipe (FOV of 1.57 ft2), one hundred and sixty-seven (167) measurements were taken in the 8-inch ID pipe (FOV of 2.09 ft2), thirty (30) measurements were taken in 12-inch ID pipe (FOV of 3.14 ft2) and thirty (30) measurements were taken in 15-inch ID pipe (FOV of 3.93 ft2). This corresponds to an area of 632 ft2 or approximately 29% areal coverage.

The instruments and detectors used for this survey are presented in Table 6. The instrument and detector were verified to be properly calibrated prior to use.

Table 6 - Instruments and Detectors Instrument/Detector Type Serial # Calibration Due Date Ludlum 2350-1/Ludlum 44-157 304713/PR327899 12/11/19 Ludlum 2350-1/Ludlum 44-157 203445/PR372136 12/4/2019 Ludlum 2350-1/Ludlum 44-10 304713/PR372147 12/11/19

7. SURVEY RESULTS The SOF or unity rule is applied to the data used for the survey planning, data evaluation and statistical tests for basement surfaces since multiple radionuclide-specific measurements will be performed or the concentrations inferred based on known relationships. The application of the unity rule serves 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 DCGLW (used for the nonparametric statistical test) becomes one (1). The BcDCGL are directly analogous to the DCGLW as defined in MARSSIM. The use and application of the unity rule was performed in accordance with section 4.3.3 of MARSSIM.

As described in LTP Chapter 5, section 5.10.3.2, the Sign Test was used to evaluate the measured residual radioactivity against the dose criterion. The OpSOF for each measurement was used as the sum value for the Sign Test. The Sign Test then demonstrated that the mean activity for each ROC was less than the OpDCGL at a Type I decision error of 0.05.

[17]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C For buried pipe, areas of elevated activity were defined as any area identified by measurement (systematic or judgmental) that exceeded the OpDCGL but was less than the BcDCGL. Any area that exceeded the BcDCGL would have required remediation. The OpSOF for a systematic or a judgmental measurement/sample(s) could exceed one (1) without remediation as long as the survey unit passed the Sign Test and, the mean OpSOF for the survey unit did not exceed one. Once the survey data set passed the Sign Test (using OpDCGLs), then the mean radionuclide activity (dpm/100cm2) for each ROC from systematic measurements along with any identified elevated areas from systematic and judgmental samples was used with the BcDCGLs to perform a mean BcSOF calculation. The dose from residual radioactivity assigned to the FSS unit is the mean BcSOF multiplied by 25 mrem/yr.

After completion of the FSS measurements in the pipe, the sample plan was reviewed to confirm the completeness of the survey and the survey data was validated in accordance with procedure ZS-LT-300-001-004, Final Status Survey Data Assessment (Reference 15). Data processing includes converting measurement data into reporting units, validating instrument applicability and sensitivity, calculating relevant statistical quantities, and verifying that all DQO have been met. In accordance with the procedure, a preliminary Data Assessment was prepared.

Since the survey was performed with a Ludlum Model 44-10 set to the Cs-137 window, the calculated gross gamma value was applied to Cs-137, and the Co-60 and Cs-134 values were inferred based on the isotopic mix from Table 1 normalized to the gamma emitting ROC. The normalized mix was Cs-137 - 98.78%, Co 1.21%, and Cs-134 - 0.01%. The surrogate ratios for the HTD nuclides listed in Table 5-15 of the LTP (Ni-63/Co-60 of 180.45; Sr-90/Cs-137 of 0.002) were then used to infer representative concentrations for HTD ROC.

The results of the data assessment for the North Yard Storm Drain buried piping are provided in Attachment 2. A statistical summary of the data is presented in Table 7. No observed individual measurement exceeded an OpSOF of one.

The data collected passed the Sign Test. The result of the Sign Test is provided in Attachment 3.

[18]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C Table 7 - North Yard Storm Drain Buried Pipe - Statistical Quantities Systematic Measurement Population - Individual Measurement Metrics Total Number of Systematic Measurements = 272 Number of Quality Control Measurements = 18 Number of Judgmental/Investigational Measurements = 0 Total Number of Measurements = 290 Mean Systematic Measurement OpSOF = 0.107 Max Individual Systematic Measurement OpSOF = 0.276 Number of Systematic Measurements with OpSOF >One = 0 Statistical Quantities - Systematic Measurement Population MEAN MEDIAN MAX MIN STD. DEV. BcDCGL Avg Dose ROC BcSOF per ROC (dpm/100cm2) (dpm/100cm2) (dpm/100cm2) (dpm/100cm2) (dpm/100cm2) (dpm/100cm2) (mrem/yr)

Gross Gamma 2.61E+03 2.36E+03 6.77E+03 1.52E+03 7.93E+02 N/A N/A N/A Co-60 (2) 3.19E+01 2.88E+01 8.27E+01 1.86E+01 9.68E+00 2.64E+04 0.00121 0.030 Cs-134 (2) 3.47E-01 3.13E-01 8.98E-01 2.02E-01 1.05E-01 4.54E+04 0.00001 0.000 Cs-137 2.61E+03 2.36E+03 6.77E+03 1.52E+03 7.93E+02 1.01E+05 0.02587 0.647 Ni-63 (1) 5.76E+03 5.20E+03 1.49E+04 3.35E+03 1.75E+03 4.89E+07 0.00012 0.003 Sr-90 (1) 5.23E+00 4.72E+00 1.35E+01 3.04E+00 1.59E+00 4.50E+04 0.00012 0.003 (1) Concentrations for Ni-63 and Sr-90 are inferred (2) Concentrations for Co-60 and Cs-134 are scaled off of the measured concentration of Cs-137 using the normalized gamma mixture from Table 4 MEAN BcSOF ASSIGNED TO SURVEY UNIT (SYSTEMATIC AVG.) = 0.027 DOSE ASSIGNED TO SURVEY UNIT (SYSTEMATIC AVG.) = 0.683 mrem/yr

[19]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C

8. QUALITY CONTROL In compliance with ZS-LT-01, replicate measurements were performed on 5% of the survey locations chosen at random. Eighteen (18) replicate measurements were taken. Using the acceptance criteria specified in section 4.1.2 of ZS-LT-01, there was acceptable agreement between the replicate measurements and the original measurement in sixteen (16) of the eighteen (18) comparisons. Two (2) QC measurements did not fall within 20% of the original measurement. For the 8-inch ID pipe between CB-4 and CB-5, the 20 foot measurement was approximately 32% less than the original measurement. For the 12-inch ID pipe out of CB-7, the 8 foot measurement was approximately 31% less than the original measurement. All measurements were well below 50% of the DCGL and the instrument and detector passed the post-use response check. No further action was deemed necessary. Refer to Attachment 4 for quality control analysis results.
9. INVESTIGATIONS AND RESULTS No investigations were performed in Survey Unit 00150A/B & C.
10. REMEDIATION AND RESULTS No remediation was performed in this survey unit.
11. CHANGES FROM THE SURVEY PLAN The detector selected for the survey during the survey design (Ludlum Model 44-157) was unable to obtain satisfactory results due to high background readings. A Ludlum Model 44-10 detector was subsequently calibrated for the Cs-137 energy window operating mode and was used to successfully collect the measurements required.
12. DATA QUALITY ASSESSMENT The DQO sample design and data were reviewed in accordance with ZionSolutions procedure ZS-LT-300-001-004, Final Status Survey Data Assessment. The sample design and data were reviewed for completeness, accuracy, and consistency. Documentation was complete and legible. The FSS unit was properly classified as Class 2. All measurement results were individually reviewed and validated. The number of measurements was sufficient to meet the requirement of 25% areal coverage of accessible surfaces. The instrumentation used to perform the FSS were in calibration, capable of detecting the activity with an adequate Minimum Detectable Concentration (MDC) and successfully response checked prior to and following use.

An adequate number of replicate measurements were taken and the results meet the acceptance criteria as specified in the QAPP for completeness and consistency.

[20]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C

13. ANOMALIES No anomalies were observed during the performance or analyses of the survey.
14. CONCLUSION Two hundred seventy-two (272) static measurements were taken in the North Yard Storm Drain buried pipe. The total length of pipe was 919.00 linear feet. Forty-five (45) measurements were taken in 6-inch ID pipe (FOV of 1.57 ft2), one hundred sixty-seven (167) measurements were taken in the 8-inch ID pipe (FOV of 2.09 ft2), thirty (30) measurements were taken in 12-inch ID pipe (FOV of 3.14 ft2) and thirty (30) measurements were taken in 15-inch ID pipe (FOV of 3.93 ft2). This corresponds to a total area surveyed of 631.8 ft2, or approximately 28% areal coverage. Consequently, the 25% areal survey coverage required by the survey design was met.

All of the measurements were below an OpSOF of one, when compared to the OpDCGLBP.

The results meet the requirement for a Class 2 survey unit, with a Mean OpSOF of 0.107. The sample data passed the Sign Test. The null hypothesis was rejected.

The mean BcSOF for this survey unit is 0.027. The dose contribution from survey unit 00150A/B & C North Yard Storm Drain Buried Piping is 0.683 mrem/yr TEDE, based on the average concentration of the ROC in samples used for non-parametric statistical sampling.

Survey unit 00150A/B & C North Yard Storm Drain Buried Piping is acceptable for unrestricted release.

15. REFERENCES
1. ZionSolutions procedure ZS-LT-300-001-005, Final Status Survey Data Reporting
2. Zion Station Restoration Project License Termination Plan
3. ZionSolutions procedure ZS-LT-300-001-001, Final Status Survey Package Development
4. NUREG-1575, Multi-Agency Radiation Survey and Site Investigation Manual
5. ZionSolutions procedure ZS-LT-300-001-003, Isolation and Control for Final Status Survey
6. Zion Station Historical Site Assessment
7. ZionSolutions procedure ZS-LT-300-001-002, Survey Unit Classification
8. ZionSolutions TSD 14-016, Description of Embedded Piping, Penetrations, and Buried Pipe to Remain in Zion End State
9. ZionSolutions TSD 14-015, Buried Pipe Dose Modeling & DCGLs

[21]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C

10. ZionSolutions TSD 11-001, Technical Support Document for Potential Radionuclides of Concern During the Decommissioning of the Zion Station
11. ZionSolutions TSD 14-019, Radionuclides of Concern for Soil and Basement Fill Model Source Terms
12. ZionSolutions TSD 17-004, Operational Derived Concentration Guideline Levels for Final Status Survey
13. ZionSolutions procedure ZS-LT-01, Quality Assurance Project Plan (for Characterization and FSS)
14. ZionSolutions procedure ZS-LT-300-001-006, Radiation Surveys of Pipe Interiors Using Sodium/Cesium Iodide Detectors
15. ZionSolutions procedure ZS-LT-300-001-004, Final Status Survey Data Assessment
16. ATTACHMENTS
1. Attachment 1 - Survey Unit 00150A/B & C - Storm Drain Piping Drawing
2. Attachment 2 - Sample Data
3. Attachment 3 - Sign Test
4. Attachment 4 - QC Data Assessment

[22]

ATTACHMENT 1 SURVEY UNIT 00150A/B & C STORM DRAIN PIPING DRAWING

[23]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C Survey Unit 00150A/B & C - Storm Drain Piping Drawing

[24]

ATTACHMENT 2 SAMPLE DATA

[25]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C North Yard Storm Drain Buried Pipe FSS Measurements GROSS FEET INTO GAMMA Co-60 Cs-134 Cs-137 Ni-63 Sr-90 PIPE PIPE ID POSITION OpSOF PIPE ACTIVITY 2 2 2 2 2 2 (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm )

CB-8 to CB-9 6 Zero 2 2.29E+03 2.80E+01 3.04E-01 2.29E+03 5.05E+03 4.58E+00 0.093 6 1 4 2.88E+03 3.52E+01 3.83E-01 2.88E+03 6.36E+03 5.77E+00 0.118 6 2 6 2.22E+03 2.72E+01 2.95E-01 2.22E+03 4.90E+03 4.45E+00 0.091 6 3 8 1.70E+03 2.07E+01 2.25E-01 1.70E+03 3.74E+03 3.39E+00 0.069 6 4 10 1.83E+03 2.23E+01 2.43E-01 1.83E+03 4.03E+03 3.66E+00 0.075 6 5 12 2.40E+03 2.93E+01 3.19E-01 2.40E+03 5.29E+03 4.80E+00 0.098 6 6 14 1.87E+03 2.29E+01 2.48E-01 1.87E+03 4.13E+03 3.74E+00 0.076 6 7 16 2.27E+03 2.77E+01 3.01E-01 2.27E+03 5.00E+03 4.54E+00 0.092 6 8 18 3.17E+03 3.87E+01 4.21E-01 3.17E+03 6.99E+03 6.34E+00 0.129 6 9 20 3.17E+03 3.87E+01 4.21E-01 3.17E+03 6.99E+03 6.34E+00 0.129 6 10 22 2.53E+03 3.09E+01 3.36E-01 2.53E+03 5.58E+03 5.06E+00 0.103 6 11 24 2.88E+03 3.52E+01 3.83E-01 2.88E+03 6.36E+03 5.77E+00 0.118 6 12 26 2.75E+03 3.36E+01 3.65E-01 2.75E+03 6.07E+03 5.50E+00 0.112 6 13 28 2.53E+03 3.09E+01 3.36E-01 2.53E+03 5.58E+03 5.06E+00 0.103 6 14 30 2.36E+03 2.88E+01 3.13E-01 2.36E+03 5.19E+03 4.71E+00 0.096 6 15 32 2.29E+03 2.80E+01 3.04E-01 2.29E+03 5.05E+03 4.58E+00 0.093 6 16 34 2.03E+03 2.47E+01 2.69E-01 2.03E+03 4.46E+03 4.05E+00 0.083 6 17 36 2.64E+03 3.23E+01 3.51E-01 2.64E+03 5.82E+03 5.28E+00 0.108 6 18 38 2.75E+03 3.36E+01 3.65E-01 2.75E+03 6.07E+03 5.50E+00 0.112 6 19 40 2.07E+03 2.53E+01 2.75E-01 2.07E+03 4.56E+03 4.14E+00 0.084 6 20 42 2.07E+03 2.53E+01 2.75E-01 2.07E+03 4.56E+03 4.14E+00 0.084 6 21 44 1.83E+03 2.23E+01 2.43E-01 1.83E+03 4.03E+03 3.66E+00 0.075 6 22 46 2.33E+03 2.85E+01 3.10E-01 2.33E+03 5.14E+03 4.67E+00 0.095 6 23 48 2.14E+03 2.61E+01 2.84E-01 2.14E+03 4.71E+03 4.27E+00 0.087 6 24 50 2.20E+03 2.69E+01 2.92E-01 2.20E+03 4.85E+03 4.40E+00 0.090 CB-8 to CB-1 6 25 2 2.31E+03 2.82E+01 3.07E-01 2.31E+03 5.10E+03 4.62E+00 0.094 6 26 4 1.98E+03 2.42E+01 2.63E-01 1.98E+03 4.37E+03 3.96E+00 0.081 6 27 6 2.18E+03 2.66E+01 2.89E-01 2.18E+03 4.80E+03 4.36E+00 0.089 6 28 8 2.09E+03 2.56E+01 2.78E-01 2.09E+03 4.61E+03 4.18E+00 0.085 6 29 10 2.07E+03 2.53E+01 2.75E-01 2.07E+03 4.56E+03 4.14E+00 0.084 6 30 12 1.98E+03 2.42E+01 2.63E-01 1.98E+03 4.37E+03 3.96E+00 0.081

[26]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C North Yard Storm Drain Buried Pipe FSS Measurements (continued)

GROSS FEET INTO GAMMA Co-60 Cs-134 Cs-137 Ni-63 Sr-90 PIPE PIPE ID POSITION OpSOF PIPE ACTIVITY 2 2 2 2 2 2 (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm )

CB-8 to CB-1 6 31 14 2.16E+03 2.64E+01 2.86E-01 2.16E+03 4.76E+03 4.32E+00 0.088 6 32 16 2.58E+03 3.15E+01 3.42E-01 2.58E+03 5.68E+03 5.15E+00 0.105 6 33 18 2.80E+03 3.42E+01 3.71E-01 2.80E+03 6.16E+03 5.59E+00 0.114 6 34 20 1.85E+03 2.26E+01 2.46E-01 1.85E+03 4.08E+03 3.70E+00 0.075 6 35 22 1.52E+03 1.86E+01 2.02E-01 1.52E+03 3.35E+03 3.04E+00 0.062 6 36 24 1.94E+03 2.37E+01 2.57E-01 1.94E+03 4.27E+03 3.88E+00 0.079 6 37 26 1.74E+03 2.12E+01 2.31E-01 1.74E+03 3.83E+03 3.48E+00 0.071 6 38 28 2.07E+03 2.53E+01 2.75E-01 2.07E+03 4.56E+03 4.14E+00 0.084 6 39 30 2.25E+03 2.74E+01 2.98E-01 2.25E+03 4.95E+03 4.49E+00 0.092 6 40 32 2.33E+03 2.85E+01 3.10E-01 2.33E+03 5.14E+03 4.67E+00 0.095 6 41 34 2.47E+03 3.01E+01 3.27E-01 2.47E+03 5.44E+03 4.93E+00 0.101 6 42 36 1.74E+03 2.12E+01 2.31E-01 1.74E+03 3.83E+03 3.48E+00 0.071 6 43 38 1.74E+03 2.12E+01 2.31E-01 1.74E+03 3.83E+03 3.48E+00 0.071 6 44 40 1.85E+03 2.26E+01 2.46E-01 1.85E+03 4.08E+03 3.70E+00 0.075 CB-1 to CB-2 8 Zero 2 2.66E+03 3.25E+01 3.54E-01 2.66E+03 5.87E+03 5.33E+00 0.109 8 1 4 2.73E+03 3.34E+01 3.63E-01 2.73E+03 6.03E+03 5.47E+00 0.112 8 2 6 2.19E+03 2.68E+01 2.91E-01 2.19E+03 4.83E+03 4.39E+00 0.089 8 3 8 2.12E+03 2.59E+01 2.82E-01 2.12E+03 4.68E+03 4.24E+00 0.087 8 4 10 2.59E+03 3.17E+01 3.44E-01 2.59E+03 5.72E+03 5.19E+00 0.106 8 5 12 2.55E+03 3.11E+01 3.38E-01 2.55E+03 5.61E+03 5.09E+00 0.104 8 6 14 2.40E+03 2.94E+01 3.19E-01 2.40E+03 5.30E+03 4.81E+00 0.098 8 7 16 2.36E+03 2.88E+01 3.13E-01 2.36E+03 5.20E+03 4.72E+00 0.096 8 8 18 2.78E+03 3.40E+01 3.69E-01 2.78E+03 6.13E+03 5.56E+00 0.113 8 9 20 2.81E+03 3.43E+01 3.73E-01 2.81E+03 6.18E+03 5.61E+00 0.114 8 10 22 2.62E+03 3.20E+01 3.47E-01 2.62E+03 5.77E+03 5.23E+00 0.107 8 11 24 3.30E+03 4.03E+01 4.38E-01 3.30E+03 7.28E+03 6.60E+00 0.135 8 12 26 2.73E+03 3.34E+01 3.63E-01 2.73E+03 6.03E+03 5.47E+00 0.112 8 13 28 2.62E+03 3.20E+01 3.47E-01 2.62E+03 5.77E+03 5.23E+00 0.107 8 14 30 3.32E+03 4.06E+01 4.41E-01 3.32E+03 7.33E+03 6.65E+00 0.136 8 15 32 2.88E+03 3.51E+01 3.82E-01 2.88E+03 6.34E+03 5.75E+00 0.117

[27]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C North Yard Storm Drain Buried Pipe FSS Measurements (continued)

GROSS FEET INTO GAMMA Co-60 Cs-134 Cs-137 Ni-63 Sr-90 PIPE PIPE ID POSITION OpSOF PIPE ACTIVITY 2 2 2 2 2 2 (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm )

CB-1 to CB-2 8 16 34 3.16E+03 3.86E+01 4.19E-01 3.16E+03 6.96E+03 6.32E+00 0.129 8 17 36 2.88E+03 3.51E+01 3.82E-01 2.88E+03 6.34E+03 5.75E+00 0.117 8 18 38 3.32E+03 4.06E+01 4.41E-01 3.32E+03 7.33E+03 6.65E+00 0.136 8 19 40 2.88E+03 3.51E+01 3.82E-01 2.88E+03 6.34E+03 5.75E+00 0.117 8 20 42 3.28E+03 4.00E+01 4.35E-01 3.28E+03 7.22E+03 6.55E+00 0.134 8 21 44 3.23E+03 3.94E+01 4.28E-01 3.23E+03 7.11E+03 6.45E+00 0.132 CB-2 to CB-3 8 Zero 2 2.81E+03 3.43E+01 3.73E-01 2.81E+03 6.18E+03 5.61E+00 0.114 8 1 4 2.62E+03 3.20E+01 3.47E-01 2.62E+03 5.77E+03 5.23E+00 0.107 8 2 6 2.55E+03 3.11E+01 3.38E-01 2.55E+03 5.61E+03 5.09E+00 0.104 8 3 8 2.29E+03 2.79E+01 3.04E-01 2.29E+03 5.04E+03 4.57E+00 0.093 8 4 10 2.31E+03 2.82E+01 3.07E-01 2.31E+03 5.09E+03 4.62E+00 0.094 8 5 12 2.52E+03 3.08E+01 3.35E-01 2.52E+03 5.56E+03 5.05E+00 0.103 8 6 14 2.19E+03 2.68E+01 2.91E-01 2.19E+03 4.83E+03 4.39E+00 0.089 8 7 16 2.17E+03 2.65E+01 2.88E-01 2.17E+03 4.78E+03 4.34E+00 0.088 8 8 18 2.76E+03 3.37E+01 3.66E-01 2.76E+03 6.08E+03 5.52E+00 0.112 8 9 20 2.22E+03 2.71E+01 2.94E-01 2.22E+03 4.88E+03 4.43E+00 0.090 8 10 22 3.14E+03 3.83E+01 4.16E-01 3.14E+03 6.91E+03 6.27E+00 0.128 8 11 24 2.40E+03 2.94E+01 3.19E-01 2.40E+03 5.30E+03 4.81E+00 0.098 8 12 26 2.78E+03 3.40E+01 3.69E-01 2.78E+03 6.13E+03 5.56E+00 0.113 8 13 28 2.19E+03 2.68E+01 2.91E-01 2.19E+03 4.83E+03 4.39E+00 0.089 8 14 30 2.29E+03 2.79E+01 3.04E-01 2.29E+03 5.04E+03 4.57E+00 0.093 8 15 32 1.84E+03 2.25E+01 2.44E-01 1.84E+03 4.05E+03 3.68E+00 0.075 8 16 34 2.33E+03 2.85E+01 3.10E-01 2.33E+03 5.14E+03 4.67E+00 0.095 8 17 36 2.69E+03 3.28E+01 3.57E-01 2.69E+03 5.92E+03 5.38E+00 0.110 8 18 38 2.03E+03 2.48E+01 2.69E-01 2.03E+03 4.47E+03 4.06E+00 0.083 8 19 40 2.81E+03 3.43E+01 3.73E-01 2.81E+03 6.18E+03 5.61E+00 0.114 8 20 2 2.48E+03 3.02E+01 3.29E-01 2.48E+03 5.46E+03 4.95E+00 0.101 8 21 4 2.78E+03 3.40E+01 3.69E-01 2.78E+03 6.13E+03 5.56E+00 0.113 8 22 6 2.45E+03 3.00E+01 3.26E-01 2.45E+03 5.40E+03 4.90E+00 0.100 8 23 8 2.36E+03 2.88E+01 3.13E-01 2.36E+03 5.20E+03 4.72E+00 0.096 8 24 10 2.76E+03 3.37E+01 3.66E-01 2.76E+03 6.08E+03 5.52E+00 0.112

[28]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C North Yard Storm Drain Buried Pipe FSS Measurements (continued)

GROSS FEET INTO GAMMA Co-60 Cs-134 Cs-137 Ni-63 Sr-90 PIPE PIPE ID POSITION OpSOF PIPE ACTIVITY 2 2 2 2 2 2 (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm )

CB-2 to CB-3 8 25 12 2.55E+03 3.11E+01 3.38E-01 2.55E+03 5.61E+03 5.09E+00 0.104 8 26 14 2.05E+03 2.51E+01 2.72E-01 2.05E+03 4.52E+03 4.10E+00 0.084 8 27 16 2.22E+03 2.71E+01 2.94E-01 2.22E+03 4.88E+03 4.43E+00 0.090 8 28 18 2.24E+03 2.74E+01 2.97E-01 2.24E+03 4.94E+03 4.48E+00 0.091 8 29 20 2.22E+03 2.71E+01 2.94E-01 2.22E+03 4.88E+03 4.43E+00 0.090 8 30 22 2.00E+03 2.45E+01 2.66E-01 2.00E+03 4.42E+03 4.01E+00 0.082 8 31 24 1.93E+03 2.36E+01 2.57E-01 1.93E+03 4.26E+03 3.87E+00 0.079 8 32 26 2.19E+03 2.68E+01 2.91E-01 2.19E+03 4.83E+03 4.39E+00 0.089 8 33 28 2.36E+03 2.88E+01 3.13E-01 2.36E+03 5.20E+03 4.72E+00 0.096 8 34 30 2.03E+03 2.48E+01 2.69E-01 2.03E+03 4.47E+03 4.06E+00 0.083 8 35 32 2.15E+03 2.62E+01 2.85E-01 2.15E+03 4.73E+03 4.29E+00 0.087 8 36 34 1.82E+03 2.22E+01 2.41E-01 1.82E+03 4.00E+03 3.63E+00 0.074 8 37 36 2.26E+03 2.76E+01 3.01E-01 2.26E+03 4.99E+03 4.53E+00 0.092 8 38 38 2.26E+03 2.76E+01 3.01E-01 2.26E+03 4.99E+03 4.53E+00 0.092 8 39 40 2.31E+03 2.82E+01 3.07E-01 2.31E+03 5.09E+03 4.62E+00 0.094 CB-3 to CB-4 8 Zero 2 2.50E+03 3.05E+01 3.32E-01 2.50E+03 5.51E+03 5.00E+00 0.102 8 1 4 2.36E+03 2.88E+01 3.13E-01 2.36E+03 5.20E+03 4.72E+00 0.096 8 2 6 2.31E+03 2.82E+01 3.07E-01 2.31E+03 5.09E+03 4.62E+00 0.094 8 3 8 1.96E+03 2.39E+01 2.60E-01 1.96E+03 4.31E+03 3.91E+00 0.080 8 4 10 1.96E+03 2.39E+01 2.60E-01 1.96E+03 4.31E+03 3.91E+00 0.080 8 5 12 1.77E+03 2.16E+01 2.35E-01 1.77E+03 3.90E+03 3.54E+00 0.072 8 6 14 2.24E+03 2.74E+01 2.97E-01 2.24E+03 4.94E+03 4.48E+00 0.091 8 7 16 1.82E+03 2.22E+01 2.41E-01 1.82E+03 4.00E+03 3.63E+00 0.074 8 8 18 2.19E+03 2.68E+01 2.91E-01 2.19E+03 4.83E+03 4.39E+00 0.089 8 9 20 2.17E+03 2.65E+01 2.88E-01 2.17E+03 4.78E+03 4.34E+00 0.088 8 10 22 2.22E+03 2.71E+01 2.94E-01 2.22E+03 4.88E+03 4.43E+00 0.090 8 11 24 2.12E+03 2.59E+01 2.82E-01 2.12E+03 4.68E+03 4.24E+00 0.087 8 12 26 1.67E+03 2.04E+01 2.22E-01 1.67E+03 3.69E+03 3.35E+00 0.068 8 13 28 2.31E+03 2.82E+01 3.07E-01 2.31E+03 5.09E+03 4.62E+00 0.094 8 14 30 1.93E+03 2.36E+01 2.57E-01 1.93E+03 4.26E+03 3.87E+00 0.079 8 15 32 2.45E+03 3.00E+01 3.26E-01 2.45E+03 5.40E+03 4.90E+00 0.100

[29]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C North Yard Storm Drain Buried Pipe FSS Measurements (continued)

GROSS FEET INTO GAMMA Co-60 Cs-134 Cs-137 Ni-63 Sr-90 PIPE PIPE ID POSITION OpSOF PIPE ACTIVITY 2 2 2 2 2 2 (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm )

CB-3 to CB-4 8 16 34 1.58E+03 1.93E+01 2.10E-01 1.58E+03 3.48E+03 3.16E+00 0.064 8 17 36 2.10E+03 2.56E+01 2.79E-01 2.10E+03 4.63E+03 4.20E+00 0.086 8 18 38 2.57E+03 3.14E+01 3.41E-01 2.57E+03 5.66E+03 5.14E+00 0.105 8 19 40 2.73E+03 3.34E+01 3.63E-01 2.73E+03 6.03E+03 5.47E+00 0.112 8 20 2 2.69E+03 3.28E+01 3.57E-01 2.69E+03 5.92E+03 5.38E+00 0.110 8 21 4 1.86E+03 2.28E+01 2.47E-01 1.86E+03 4.11E+03 3.73E+00 0.076 8 22 6 2.36E+03 2.88E+01 3.13E-01 2.36E+03 5.20E+03 4.72E+00 0.096 8 23 8 2.26E+03 2.76E+01 3.01E-01 2.26E+03 4.99E+03 4.53E+00 0.092 8 24 10 2.15E+03 2.62E+01 2.85E-01 2.15E+03 4.73E+03 4.29E+00 0.087 8 25 12 2.40E+03 2.94E+01 3.19E-01 2.40E+03 5.30E+03 4.81E+00 0.098 8 26 14 2.69E+03 3.28E+01 3.57E-01 2.69E+03 5.92E+03 5.38E+00 0.110 8 27 16 2.07E+03 2.53E+01 2.75E-01 2.07E+03 4.57E+03 4.15E+00 0.085 8 28 18 2.45E+03 3.00E+01 3.26E-01 2.45E+03 5.40E+03 4.90E+00 0.100 8 29 20 2.22E+03 2.71E+01 2.94E-01 2.22E+03 4.88E+03 4.43E+00 0.090 8 30 22 2.15E+03 2.62E+01 2.85E-01 2.15E+03 4.73E+03 4.29E+00 0.087 8 31 24 2.48E+03 3.02E+01 3.29E-01 2.48E+03 5.46E+03 4.95E+00 0.101 8 32 26 2.03E+03 2.48E+01 2.69E-01 2.03E+03 4.47E+03 4.06E+00 0.083 8 33 28 2.19E+03 2.68E+01 2.91E-01 2.19E+03 4.83E+03 4.39E+00 0.089 8 34 30 2.05E+03 2.51E+01 2.72E-01 2.05E+03 4.52E+03 4.10E+00 0.084 8 35 32 2.12E+03 2.59E+01 2.82E-01 2.12E+03 4.68E+03 4.24E+00 0.087 8 36 34 1.91E+03 2.33E+01 2.54E-01 1.91E+03 4.21E+03 3.82E+00 0.078 8 37 36 2.48E+03 3.02E+01 3.29E-01 2.48E+03 5.46E+03 4.95E+00 0.101 8 38 38 2.26E+03 2.76E+01 3.01E-01 2.26E+03 4.99E+03 4.53E+00 0.092 8 39 40 2.31E+03 2.82E+01 3.07E-01 2.31E+03 5.09E+03 4.62E+00 0.094 CB-4 to CB-5 8 Zero 2 1.86E+03 2.28E+01 2.47E-01 1.86E+03 4.11E+03 3.73E+00 0.076 8 1 4 2.07E+03 2.53E+01 2.75E-01 2.07E+03 4.57E+03 4.15E+00 0.085 8 2 6 2.50E+03 3.05E+01 3.32E-01 2.50E+03 5.51E+03 5.00E+00 0.102 8 3 8 1.96E+03 2.39E+01 2.60E-01 1.96E+03 4.31E+03 3.91E+00 0.080 8 4 10 2.00E+03 2.45E+01 2.66E-01 2.00E+03 4.42E+03 4.01E+00 0.082 8 5 12 1.82E+03 2.22E+01 2.41E-01 1.82E+03 4.00E+03 3.63E+00 0.074 8 6 14 1.91E+03 2.33E+01 2.54E-01 1.91E+03 4.21E+03 3.82E+00 0.078

[30]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C North Yard Storm Drain Buried Pipe FSS Measurements (continued)

GROSS FEET INTO GAMMA Co-60 Cs-134 Cs-137 Ni-63 Sr-90 PIPE PIPE ID POSITION OpSOF PIPE ACTIVITY 2 2 2 2 2 2 (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm )

CB-4 to CB-5 8 7 16 2.24E+03 2.74E+01 2.97E-01 2.24E+03 4.94E+03 4.48E+00 0.091 8 8 18 1.89E+03 2.30E+01 2.50E-01 1.89E+03 4.16E+03 3.77E+00 0.077 8 9 20 1.79E+03 2.19E+01 2.38E-01 1.79E+03 3.95E+03 3.58E+00 0.073 8 10 22 2.05E+03 2.51E+01 2.72E-01 2.05E+03 4.52E+03 4.10E+00 0.084 8 11 24 2.10E+03 2.56E+01 2.79E-01 2.10E+03 4.63E+03 4.20E+00 0.086 8 12 26 1.98E+03 2.42E+01 2.63E-01 1.98E+03 4.37E+03 3.96E+00 0.081 8 13 28 2.36E+03 2.88E+01 3.13E-01 2.36E+03 5.20E+03 4.72E+00 0.096 8 14 30 2.15E+03 2.62E+01 2.85E-01 2.15E+03 4.73E+03 4.29E+00 0.087 8 15 2 1.86E+03 2.28E+01 2.47E-01 1.86E+03 4.11E+03 3.73E+00 0.076 8 16 4 2.36E+03 2.88E+01 3.13E-01 2.36E+03 5.20E+03 4.72E+00 0.096 8 17 6 1.67E+03 2.04E+01 2.22E-01 1.67E+03 3.69E+03 3.35E+00 0.068 8 18 8 2.07E+03 2.53E+01 2.75E-01 2.07E+03 4.57E+03 4.15E+00 0.085 8 19 10 2.17E+03 2.65E+01 2.88E-01 2.17E+03 4.78E+03 4.34E+00 0.088 8 20 12 2.10E+03 2.56E+01 2.79E-01 2.10E+03 4.63E+03 4.20E+00 0.086 8 21 14 2.12E+03 2.59E+01 2.82E-01 2.12E+03 4.68E+03 4.24E+00 0.087 8 22 16 2.55E+03 3.11E+01 3.38E-01 2.55E+03 5.61E+03 5.09E+00 0.104 8 23 18 2.52E+03 3.08E+01 3.35E-01 2.52E+03 5.56E+03 5.05E+00 0.103 8 24 20 2.15E+03 2.62E+01 2.85E-01 2.15E+03 4.73E+03 4.29E+00 0.087 8 25 22 2.48E+03 3.02E+01 3.29E-01 2.48E+03 5.46E+03 4.95E+00 0.101 8 26 24 2.52E+03 3.08E+01 3.35E-01 2.52E+03 5.56E+03 5.05E+00 0.103 8 27 26 1.98E+03 2.42E+01 2.63E-01 1.98E+03 4.37E+03 3.96E+00 0.081 8 28 28 2.43E+03 2.97E+01 3.22E-01 2.43E+03 5.35E+03 4.86E+00 0.099 8 29 30 1.79E+03 2.19E+01 2.38E-01 1.79E+03 3.95E+03 3.58E+00 0.073 CB-5 to CB-6 8 Zero 2 2.45E+03 3.00E+01 3.26E-01 2.45E+03 5.40E+03 4.90E+00 0.100 8 1 4 2.07E+03 2.53E+01 2.75E-01 2.07E+03 4.57E+03 4.15E+00 0.085 8 2 6 2.12E+03 2.59E+01 2.82E-01 2.12E+03 4.68E+03 4.24E+00 0.087 8 3 8 1.84E+03 2.25E+01 2.44E-01 1.84E+03 4.05E+03 3.68E+00 0.075 8 4 10 2.50E+03 3.05E+01 3.32E-01 2.50E+03 5.51E+03 5.00E+00 0.102 8 5 12 1.79E+03 2.19E+01 2.38E-01 1.79E+03 3.95E+03 3.58E+00 0.073 8 6 14 2.48E+03 3.02E+01 3.29E-01 2.48E+03 5.46E+03 4.95E+00 0.101 8 7 16 2.05E+03 2.51E+01 2.72E-01 2.05E+03 4.52E+03 4.10E+00 0.084

[31]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C North Yard Storm Drain Buried Pipe FSS Measurements (continued)

GROSS FEET INTO GAMMA Co-60 Cs-134 Cs-137 Ni-63 Sr-90 PIPE PIPE ID POSITION OpSOF PIPE ACTIVITY 2 2 2 2 2 2 (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm )

CB-5 to CB-6 8 8 18 1.93E+03 2.36E+01 2.57E-01 1.93E+03 4.26E+03 3.87E+00 0.079 8 9 20 2.40E+03 2.94E+01 3.19E-01 2.40E+03 5.30E+03 4.81E+00 0.098 8 10 22 2.48E+03 3.02E+01 3.29E-01 2.48E+03 5.46E+03 4.95E+00 0.101 8 11 24 2.36E+03 2.88E+01 3.13E-01 2.36E+03 5.20E+03 4.72E+00 0.096 8 12 26 2.29E+03 2.79E+01 3.04E-01 2.29E+03 5.04E+03 4.57E+00 0.093 8 13 28 2.40E+03 2.94E+01 3.19E-01 2.40E+03 5.30E+03 4.81E+00 0.098 8 14 30 2.15E+03 2.62E+01 2.85E-01 2.15E+03 4.73E+03 4.29E+00 0.087 8 15 32 2.07E+03 2.53E+01 2.75E-01 2.07E+03 4.57E+03 4.15E+00 0.085 8 16 34 2.33E+03 2.85E+01 3.10E-01 2.33E+03 5.14E+03 4.67E+00 0.095 8 17 36 2.55E+03 3.11E+01 3.38E-01 2.55E+03 5.61E+03 5.09E+00 0.104 8 18 38 2.17E+03 2.65E+01 2.88E-01 2.17E+03 4.78E+03 4.34E+00 0.088 8 19 40 2.36E+03 2.88E+01 3.13E-01 2.36E+03 5.20E+03 4.72E+00 0.096 CB-7 to 8 Zero 1 2.15E+03 2.62E+01 2.85E-01 2.15E+03 4.73E+03 4.29E+00 0.087 Capped pipe 8 1 2 2.07E+03 2.53E+01 2.75E-01 2.07E+03 4.57E+03 4.15E+00 0.085 8 2 3 2.10E+03 2.56E+01 2.79E-01 2.10E+03 4.63E+03 4.20E+00 0.086 8 3 4 2.33E+03 2.85E+01 3.10E-01 2.33E+03 5.14E+03 4.67E+00 0.095 8 4 5 2.33E+03 2.85E+01 3.10E-01 2.33E+03 5.14E+03 4.67E+00 0.095 8 5 6 2.36E+03 2.88E+01 3.13E-01 2.36E+03 5.20E+03 4.72E+00 0.096 8 6 7 1.91E+03 2.33E+01 2.54E-01 1.91E+03 4.21E+03 3.82E+00 0.078 8 7 8 3.73E+03 4.55E+01 4.95E-01 3.73E+03 8.21E+03 7.45E+00 0.152 8 8 9 2.62E+03 3.20E+01 3.47E-01 2.62E+03 5.77E+03 5.23E+00 0.107 8 9 10 2.48E+03 3.02E+01 3.29E-01 2.48E+03 5.46E+03 4.95E+00 0.101 8 10 11 2.31E+03 2.82E+01 3.07E-01 2.31E+03 5.09E+03 4.62E+00 0.094 8 11 12 2.24E+03 2.74E+01 2.97E-01 2.24E+03 4.94E+03 4.48E+00 0.091 8 12 13 2.05E+03 2.51E+01 2.72E-01 2.05E+03 4.52E+03 4.10E+00 0.084 8 13 14 2.05E+03 2.51E+01 2.72E-01 2.05E+03 4.52E+03 4.10E+00 0.084 8 14 15 2.22E+03 2.71E+01 2.94E-01 2.22E+03 4.88E+03 4.43E+00 0.090 CB-7 to CB-6 12 Zero 2 3.18E+03 3.88E+01 4.22E-01 3.18E+03 7.01E+03 6.36E+00 0.130 12 1 4 3.05E+03 3.72E+01 4.04E-01 3.05E+03 6.71E+03 6.09E+00 0.124

[32]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C North Yard Storm Drain Buried Pipe FSS Measurements (continued)

GROSS FEET INTO GAMMA Co-60 Cs-134 Cs-137 Ni-63 Sr-90 PIPE PIPE ID POSITION OpSOF PIPE ACTIVITY 2 2 2 2 2 2 (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm )

CB-7 to CB-6 12 2 6 3.09E+03 3.77E+01 4.10E-01 3.09E+03 6.81E+03 6.18E+00 0.126 12 3 8 3.27E+03 3.99E+01 4.34E-01 3.27E+03 7.21E+03 6.54E+00 0.133 12 4 10 2.91E+03 3.56E+01 3.87E-01 2.91E+03 6.42E+03 5.82E+00 0.119 12 5 12 3.00E+03 3.67E+01 3.98E-01 3.00E+03 6.61E+03 6.00E+00 0.122 12 6 14 2.91E+03 3.56E+01 3.87E-01 2.91E+03 6.42E+03 5.82E+00 0.119 12 7 16 2.71E+03 3.31E+01 3.60E-01 2.71E+03 5.97E+03 5.42E+00 0.110 12 8 18 3.11E+03 3.80E+01 4.13E-01 3.11E+03 6.86E+03 6.23E+00 0.127 12 9 20 3.20E+03 3.91E+01 4.25E-01 3.20E+03 7.06E+03 6.40E+00 0.131 12 10 22 3.14E+03 3.83E+01 4.16E-01 3.14E+03 6.91E+03 6.27E+00 0.128 12 11 24 3.52E+03 4.29E+01 4.67E-01 3.52E+03 7.75E+03 7.03E+00 0.143 12 12 26 3.25E+03 3.97E+01 4.31E-01 3.25E+03 7.16E+03 6.49E+00 0.132 12 13 28 2.75E+03 3.36E+01 3.66E-01 2.75E+03 6.07E+03 5.51E+00 0.112 12 14 30 2.66E+03 3.26E+01 3.54E-01 2.66E+03 5.87E+03 5.33E+00 0.109 12 15 32 3.09E+03 3.77E+01 4.10E-01 3.09E+03 6.81E+03 6.18E+00 0.126 12 16 34 3.05E+03 3.72E+01 4.04E-01 3.05E+03 6.71E+03 6.09E+00 0.124 12 17 36 2.66E+03 3.26E+01 3.54E-01 2.66E+03 5.87E+03 5.33E+00 0.109 12 18 38 2.80E+03 3.42E+01 3.72E-01 2.80E+03 6.17E+03 5.60E+00 0.114 12 19 40 3.02E+03 3.69E+01 4.01E-01 3.02E+03 6.66E+03 6.05E+00 0.123 12 20 42 3.09E+03 3.77E+01 4.10E-01 3.09E+03 6.81E+03 6.18E+00 0.126 12 21 44 3.18E+03 3.88E+01 4.22E-01 3.18E+03 7.01E+03 6.36E+00 0.130 12 22 46 3.52E+03 4.29E+01 4.67E-01 3.52E+03 7.75E+03 7.03E+00 0.143 12 23 48 3.02E+03 3.69E+01 4.01E-01 3.02E+03 6.66E+03 6.05E+00 0.123 12 24 50 3.18E+03 3.88E+01 4.22E-01 3.18E+03 7.01E+03 6.36E+00 0.130 12 25 52 2.96E+03 3.61E+01 3.92E-01 2.96E+03 6.52E+03 5.91E+00 0.121 12 26 54 3.29E+03 4.02E+01 4.37E-01 3.29E+03 7.26E+03 6.58E+00 0.134 12 27 56 2.73E+03 3.34E+01 3.63E-01 2.73E+03 6.02E+03 5.46E+00 0.111 12 28 58 2.40E+03 2.93E+01 3.18E-01 2.40E+03 5.28E+03 4.79E+00 0.098 12 29 60 3.11E+03 3.80E+01 4.13E-01 3.11E+03 6.86E+03 6.23E+00 0.127 CB-7 to E. Ditch 15 Zero 2 4.41E+03 5.39E+01 5.85E-01 4.41E+03 9.72E+03 8.82E+00 0.180

[33]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C North Yard Storm Drain Buried Pipe FSS Measurements (continued)

GROSS FEET INTO GAMMA Co-60 Cs-134 Cs-137 Ni-63 Sr-90 PIPE PIPE ID POSITION OpSOF PIPE ACTIVITY 2 2 2 2 2 2 (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) (dpm/100cm )

CB-7 to E. Ditch 15 1 4 3.62E+03 4.43E+01 4.81E-01 3.62E+03 7.99E+03 7.25E+00 0.148 15 2 6 3.97E+03 4.85E+01 5.27E-01 3.97E+03 8.76E+03 7.95E+00 0.162 15 3 8 3.71E+03 4.53E+01 4.93E-01 3.71E+03 8.18E+03 7.42E+00 0.151 15 4 10 3.97E+03 4.85E+01 5.27E-01 3.97E+03 8.76E+03 7.95E+00 0.162 15 5 12 3.14E+03 3.84E+01 4.17E-01 3.14E+03 6.93E+03 6.29E+00 0.128 15 6 14 3.58E+03 4.37E+01 4.75E-01 3.58E+03 7.89E+03 7.16E+00 0.146 15 7 16 4.50E+03 5.49E+01 5.97E-01 4.50E+03 9.91E+03 8.99E+00 0.183 15 8 18 6.77E+03 8.27E+01 8.98E-01 6.77E+03 1.49E+04 1.35E+01 0.276 15 9 20 4.63E+03 5.65E+01 6.14E-01 4.63E+03 1.02E+04 9.26E+00 0.189 15 10 22 4.19E+03 5.12E+01 5.56E-01 4.19E+03 9.24E+03 8.38E+00 0.171 15 11 24 4.37E+03 5.33E+01 5.80E-01 4.37E+03 9.62E+03 8.73E+00 0.178 15 12 26 3.36E+03 4.11E+01 4.46E-01 3.36E+03 7.41E+03 6.72E+00 0.137 15 13 28 3.71E+03 4.53E+01 4.93E-01 3.71E+03 8.18E+03 7.42E+00 0.151 15 14 30 4.28E+03 5.23E+01 5.68E-01 4.28E+03 9.43E+03 8.56E+00 0.174 15 15 32 3.93E+03 4.80E+01 5.22E-01 3.93E+03 8.66E+03 7.86E+00 0.160 15 16 34 4.06E+03 4.96E+01 5.39E-01 4.06E+03 8.95E+03 8.12E+00 0.166 15 17 36 3.97E+03 4.85E+01 5.27E-01 3.97E+03 8.76E+03 7.95E+00 0.162 15 18 38 4.58E+03 5.60E+01 6.09E-01 4.58E+03 1.01E+04 9.17E+00 0.187 15 19 40 6.24E+03 7.63E+01 8.29E-01 6.24E+03 1.38E+04 1.25E+01 0.255 15 20 42 4.71E+03 5.76E+01 6.26E-01 4.71E+03 1.04E+04 9.43E+00 0.192 15 21 44 4.10E+03 5.01E+01 5.45E-01 4.10E+03 9.04E+03 8.21E+00 0.167 15 22 46 4.41E+03 5.39E+01 5.85E-01 4.41E+03 9.72E+03 8.82E+00 0.180 15 23 48 3.89E+03 4.75E+01 5.16E-01 3.89E+03 8.56E+03 7.77E+00 0.158 15 24 50 4.45E+03 5.44E+01 5.91E-01 4.45E+03 9.81E+03 8.91E+00 0.182 15 25 52 4.89E+03 5.97E+01 6.49E-01 4.89E+03 1.08E+04 9.78E+00 0.199 15 26 54 4.45E+03 5.44E+01 5.91E-01 4.45E+03 9.81E+03 8.91E+00 0.182 15 27 56 4.98E+03 6.08E+01 6.61E-01 4.98E+03 1.10E+04 9.95E+00 0.203 15 28 58 5.11E+03 6.24E+01 6.78E-01 5.11E+03 1.13E+04 1.02E+01 0.208 15 29 60 5.94E+03 7.25E+01 7.88E-01 5.94E+03 1.31E+04 1.19E+01 0.242

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ATTACHMENT 3 SIGN TEST

[35]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C Sign Test - North Yard Storm Drain Buried Pipe Survey Area 00150 Survey Area NORTH YARD DRAIN PIPE Survey Unit 00150A, B & C Survey Unit 6, 8, 12 and 15-inch ID Buried Pipe Classification 2 Type I Error 0.05 Number of Measurements 272 SOF SOF

  1. 1-Ws Sign # 1-Ws Sign (Ws) (Ws) 1 0.093 0.907 +1 137 0.090 0.910 +1 2 0.118 0.882 +1 138 0.087 0.913 +1 3 0.091 0.909 +1 139 0.101 0.899 +1 4 0.069 0.931 +1 140 0.083 0.917 +1 5 0.075 0.925 +1 141 0.089 0.911 +1 6 0.098 0.902 +1 142 0.084 0.916 +1 7 0.076 0.924 +1 143 0.087 0.913 +1 8 0.092 0.908 +1 144 0.078 0.922 +1 9 0.129 0.871 +1 145 0.101 0.899 +1 10 0.129 0.871 +1 146 0.092 0.908 +1 11 0.103 0.897 +1 147 0.094 0.906 +1 12 0.118 0.882 +1 148 0.076 0.924 +1 13 0.112 0.888 +1 149 0.085 0.915 +1 14 0.103 0.897 +1 150 0.102 0.898 +1 15 0.096 0.904 +1 151 0.080 0.920 +1 16 0.093 0.907 +1 152 0.082 0.918 +1 17 0.083 0.917 +1 153 0.074 0.926 +1 18 0.108 0.892 +1 154 0.078 0.922 +1 19 0.112 0.888 +1 155 0.091 0.909 +1 20 0.084 0.916 +1 156 0.077 0.923 +1 21 0.084 0.916 +1 157 0.073 0.927 +1 22 0.075 0.925 +1 158 0.084 0.916 +1 23 0.095 0.905 +1 159 0.086 0.914 +1 24 0.087 0.913 +1 160 0.081 0.919 +1 25 0.090 0.910 +1 161 0.096 0.904 +1 26 0.094 0.906 +1 162 0.087 0.913 +1 27 0.081 0.919 +1 163 0.076 0.924 +1 28 0.089 0.911 +1 164 0.096 0.904 +1 29 0.085 0.915 +1 165 0.068 0.932 +1 30 0.084 0.916 +1 166 0.085 0.915 +1 31 0.081 0.919 +1 167 0.088 0.912 +1 32 0.088 0.912 +1 168 0.086 0.914 +1 33 0.105 0.895 +1 169 0.087 0.913 +1

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C Sign Test - North Yard Storm Drain Buried Pipe (continued)

SOF SOF

  1. 1-Ws Sign # 1-Ws Sign (Ws) (Ws) 34 0.114 0.886 +1 170 0.104 0.896 +1 35 0.075 0.925 +1 171 0.103 0.897 +1 36 0.062 0.938 +1 172 0.087 0.913 +1 37 0.079 0.921 +1 173 0.101 0.899 +1 38 0.071 0.929 +1 174 0.103 0.897 +1 39 0.084 0.916 +1 175 0.081 0.919 +1 40 0.092 0.908 +1 176 0.099 0.901 +1 41 0.095 0.905 +1 177 0.073 0.927 +1 42 0.101 0.899 +1 178 0.100 0.900 +1 43 0.071 0.929 +1 179 0.085 0.915 +1 44 0.071 0.929 +1 180 0.087 0.913 +1 45 0.075 0.925 +1 181 0.075 0.925 +1 46 0.109 0.891 +1 182 0.102 0.898 +1 47 0.112 0.888 +1 183 0.073 0.927 +1 48 0.089 0.911 +1 184 0.101 0.899 +1 49 0.087 0.913 +1 185 0.084 0.916 +1 50 0.106 0.894 +1 186 0.079 0.921 +1 51 0.104 0.896 +1 187 0.098 0.902 +1 52 0.098 0.902 +1 188 0.101 0.899 +1 53 0.096 0.904 +1 189 0.096 0.904 +1 54 0.113 0.887 +1 190 0.093 0.907 +1 55 0.114 0.886 +1 191 0.098 0.902 +1 56 0.107 0.893 +1 192 0.087 0.913 +1 57 0.135 0.865 +1 193 0.085 0.915 +1 58 0.112 0.888 +1 194 0.095 0.905 +1 59 0.107 0.893 +1 195 0.104 0.896 +1 60 0.136 0.864 +1 196 0.088 0.912 +1 61 0.117 0.883 +1 197 0.096 0.904 +1 62 0.129 0.871 +1 198 0.087 0.913 +1 63 0.117 0.883 +1 199 0.085 0.915 +1 64 0.136 0.864 +1 200 0.086 0.914 +1 65 0.117 0.883 +1 201 0.095 0.905 +1 66 0.134 0.866 +1 202 0.095 0.905 +1 67 0.132 0.868 +1 203 0.096 0.904 +1 68 0.114 0.886 +1 204 0.078 0.922 +1 69 0.107 0.893 +1 205 0.152 0.848 +1 70 0.104 0.896 +1 206 0.107 0.893 +1 71 0.093 0.907 +1 207 0.101 0.899 +1

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C Sign Test - North Yard Storm Drain Buried Pipe (continued)

SOF SOF

  1. 1-Ws Sign # 1-Ws Sign (Ws) (Ws) 72 0.094 0.906 +1 208 0.094 0.906 +1 73 0.103 0.897 +1 209 0.091 0.909 +1 74 0.089 0.911 +1 210 0.084 0.916 +1 75 0.088 0.912 +1 211 0.084 0.916 +1 76 0.112 0.888 +1 212 0.090 0.910 +1 77 0.090 0.910 +1 213 0.130 0.870 +1 78 0.128 0.872 +1 214 0.124 0.876 +1 79 0.098 0.902 +1 215 0.126 0.874 +1 80 0.113 0.887 +1 216 0.133 0.867 +1 81 0.089 0.911 +1 217 0.119 0.881 +1 82 0.093 0.907 +1 218 0.122 0.878 +1 83 0.075 0.925 +1 219 0.119 0.881 +1 84 0.095 0.905 +1 220 0.110 0.890 +1 85 0.110 0.890 +1 221 0.127 0.873 +1 86 0.083 0.917 +1 222 0.131 0.869 +1 87 0.114 0.886 +1 223 0.128 0.872 +1 88 0.101 0.899 +1 224 0.143 0.857 +1 89 0.113 0.887 +1 225 0.132 0.868 +1 90 0.100 0.900 +1 226 0.112 0.888 +1 91 0.096 0.904 +1 227 0.109 0.891 +1 92 0.112 0.888 +1 228 0.126 0.874 +1 93 0.104 0.896 +1 229 0.124 0.876 +1 94 0.084 0.916 +1 230 0.109 0.891 +1 95 0.090 0.910 +1 231 0.114 0.886 +1 96 0.091 0.909 +1 232 0.123 0.877 +1 97 0.090 0.910 +1 233 0.126 0.874 +1 98 0.082 0.918 +1 234 0.130 0.870 +1 99 0.079 0.921 +1 235 0.143 0.857 +1 100 0.089 0.911 +1 236 0.123 0.877 +1 101 0.096 0.904 +1 237 0.130 0.870 +1 102 0.083 0.917 +1 238 0.121 0.879 +1 103 0.087 0.913 +1 239 0.134 0.866 +1 104 0.074 0.926 +1 240 0.111 0.889 +1 105 0.092 0.908 +1 241 0.098 0.902 +1 106 0.092 0.908 +1 242 0.127 0.873 +1 107 0.094 0.906 +1 243 0.180 0.820 +1 108 0.102 0.898 +1 244 0.148 0.852 +1 109 0.096 0.904 +1 245 0.162 0.838 +1

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FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C Sign Test - North Yard Storm Drain Buried Pipe (continued)

SOF SOF

  1. 1-Ws Sign # 1-Ws Sign (Ws) (Ws) 110 0.094 0.906 +1 246 0.151 0.849 +1 111 0.080 0.920 +1 247 0.162 0.838 +1 112 0.080 0.920 +1 248 0.128 0.872 +1 113 0.072 0.928 +1 249 0.146 0.854 +1 114 0.091 0.909 +1 250 0.183 0.817 +1 115 0.074 0.926 +1 251 0.276 0.724 +1 116 0.089 0.911 +1 252 0.189 0.811 +1 117 0.088 0.912 +1 253 0.171 0.829 +1 118 0.090 0.910 +1 254 0.178 0.822 +1 119 0.087 0.913 +1 255 0.137 0.863 +1 120 0.068 0.932 +1 256 0.151 0.849 +1 121 0.094 0.906 +1 257 0.174 0.826 +1 122 0.079 0.921 +1 258 0.160 0.840 +1 123 0.100 0.900 +1 259 0.166 0.834 +1 124 0.064 0.936 +1 260 0.162 0.838 +1 125 0.086 0.914 +1 261 0.187 0.813 +1 126 0.105 0.895 +1 262 0.255 0.745 +1 127 0.112 0.888 +1 263 0.192 0.808 +1 128 0.110 0.890 +1 264 0.167 0.833 +1 129 0.076 0.924 +1 265 0.180 0.820 +1 130 0.096 0.904 +1 266 0.158 0.842 +1 131 0.092 0.908 +1 267 0.182 0.818 +1 132 0.087 0.913 +1 268 0.199 0.801 +1 133 0.098 0.902 +1 269 0.182 0.818 +1 134 0.110 0.890 +1 270 0.203 0.797 +1 135 0.085 0.915 +1 271 0.208 0.792 +1 136 0.100 0.900 +1 272 0.242 0.758 +1 Number of positive differences (S+) 272 Critical Value 150 The Survey Unit MEETS the Acceptance Criteria

[39]

ATTACHMENT 4 QC DATA ASSESSMENT

[40]

FSS RELEASE RECORD NORTH YARD STORM DRAIN BURIED PIPING SURVEY UNIT 00150A/B & C Attachment 4 - QC Data Assessment NORTH YARD STORM DRAIN BURIED PIPE - QC AGREEMENT Survey Unit # 00150 Survey Unit Name North Yard Storm Drain Buried Pipe Sample Plan # S2-00150A, B & C Sample

Description:

Comparison of replicate gross-gamma measurements for QC from within the various Pipe ID sections that make up the North Yard Storm Drain pipe.

STANDARD REPLICATE ID ACTIVITY +20% -20% ID ACTIVITY ACCEPTABLE (dpm/100cm2) (dpm/100cm2) (dpm/100cm2) (dpm/100cm2) (Y/N)

CB-8 to CB-9 2.36E+03 2.83E+03 1.88E+03 30QC 2.77E+03 Y CB-8 to CB-9 2.20E+03 2.64E+03 1.76E+03 50QC 2.29E+03 Y CB-8 to CB-1 2.25E+03 2.70E+03 1.80E+03 30QC 2.11E+03 Y CB-1 to CB-2 2.81E+03 3.37E+03 2.24E+03 20QC 2.80E+03 Y CB-1 to CB-2 3.23E+03 3.87E+03 2.58E+03 44QC 2.78E+03 Y CB-2 to CB-3 2.81E+03 3.37E+03 2.24E+03 40QC 2.29E+03 Y CB-2 to CB-3 1.93E+03 2.32E+03 1.55E+03 24QC 2.22E+03 Y CB-3 to CB-4 2.12E+03 2.55E+03 1.70E+03 24QC 2.17E+03 Y CB-3 to CB-4 2.48E+03 2.97E+03 1.98E+03 24QC 2.24E+03 Y CB-4 to CB-5 1.79E+03 2.15E+03 1.43E+03 20QC 2.10E+03 Y CB-4 to CB-5 2.15E+03 2.57E+03 1.72E+03 20QC 1.46E+03 N CB-5 to CB-6 2.40E+03 2.89E+03 1.92E+03 20QC 2.36E+03 Y CB-5 to CB-6 2.55E+03 3.06E+03 2.04E+03 36QC 2.07E+03 Y CB-7 3.73E+03 4.47E+03 2.98E+03 8QC 2.57E+03 N CB-7 2.66E+03 3.20E+03 2.13E+03 30QC 3.05E+03 Y CB-7 3.18E+03 3.82E+03 2.54E+03 50QC 2.55E+03 Y CB-7 4.28E+03 5.13E+03 3.42E+03 30QC 4.02E+03 Y CB-7 4.45E+03 5.34E+03 3.56E+03 50QC 4.37E+03 Y Comments/Corrective Actions: Using the acceptance criteria The acceptance criteria for replicate static measurements specified in section 4.1.2 of ZS-LT-01, there was acceptable and scan surveys is that the same conclusion is reached agreement between the replicate measurements and the for each measurement. That is defined as + 20% of the original measurement in 16 of the 18 comparisons. Two (2) standard QC measurements did not fall within 20% of the original measurement. For pipe 8-inch ID pipe between CB-4 and CB-5, the 20 ft. measurement was approximately 32% less than the original measurement. For the 12-inch pipe out of CB-7, the 8 ft. measurement was approximately 31% less than the original measurement. All measurements were well below 50% of the DCGL and the instrument and detector passed the post use response check. No further action was deemed necessary.

[41]

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