ML22223A074
| ML22223A074 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 07/28/2022 |
| From: | LaCrosseSolutions |
| To: | Office of Nuclear Material Safety and Safeguards |
| Shared Package | |
| ML22223A088 | List: |
| References | |
| LS-2022-0014 LC-FS-PR-008, Rev 1 | |
| Download: ML22223A074 (53) | |
Text
~
LACROSSESOLUTIONS LACBWR Site Restoration Project Work Control Procedure Final Status Survey Data Assessment Procedure No. LC-FS-PR-008 Revision No. 1 Preparer: (Print name/Sign) R. Yetter Date: 01 /26/2018 Secondary Reviewer: L. Coffey Date: ot/t.,,~i 8" Regulatory Affairs assigned program & regulatory reviews (*new only*): Initials/Date NIA- -
Regulatory Required Reviews (attach completed LC-RA-PR-001 and QTR forms, as appJicable)
Part 50 License: IO CFR 50.59 and 50.90 0 YES X NO Fire Protection: 10 CFR 50.48(f) YES X NO Conditions of License: PSP: IO CFR 50.54(p) 0 YES X NO Conditions of License: E-Plan: IO CFR 50.54(q) 0 YES X NO Termination of License: IO CFR 50.82(a)(6) and 50.82(a)(7) YES X NO Part 72 License: .IO CFR 72.48 YES X NO Program Required Reviews RP: X YES O NO SIGNA T QA: 0 YES X NO SIGNATURE._ _ _ _ _ _ __ _ __ _ _ DATE: _ __ _
QTR: 0 YES X NO SIGNATURE_ __ _ __ __ _ _ _ _ _DATE: _ _ __
Approval Section PROJECT MANAGER: SIGNATURE~~-"-t Jh._ C A_ . ~o--lt-. DATE: \ / 3D l 18 Effective Date: \ f0C / \"ls (assigned by Document Control or Project Manager)
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 TABLE OF CONTENTS
- 1. PURPOSE AND SCOPE .......................................................................................................5 1.1. Purpose........................................................................................................................5 This procedure provides guidance to interpret survey results using the Data Quality Assessment (DQA) process during the assessment phase of Final Status Survey (FSS) at the La Crosse Station Restoration Project (LCSRP). FSS is conducted on above grade and below grade structures (basements), soil (including excavations),
and buried piping to demonstrate that residual radionuclide concentrations are equal to or below established Derived Concentration Guideline Levels (DCGL). ..............5 1.2. Scope ...........................................................................................................................5
- 2. REFERENCES .......................................................................................................................5 2.1. NUREG-1757, Consolidated NMSS Decommissioning Guidance - Survey, and Determination of Radiological Criteria Volume 2, Revision 1 - September 2002 ..5 2.2. NUREG-1575, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM) - August 2000 .......................................................................................5 2.3. La Crosse Station Restoration Project License Termination Plan - December 2014.............................................................................................................................5 2.4. LC-FS-PR-009, Final Status Survey Data Reporting ..............................................5 2.5. LC-QA-PN-001, Final Status Survey Quality Assurance Project Plan...................5 2.6. LC-FS-PR-006, Survey Unit Classification ............................................................5 2.7. LC-FS-PR-010, Isolation and Control for Final Status Survey ..............................5 2.8. LC-FS-PR-009, Final Status Survey Data Reporting ..............................................6 2.9. LC-AD-PR-004, Corrective Action Program ..........................................................6 2.10. LaCrosseSolutions Technical Support Document RS-TD-313196-001, Radionuclides of Concern During LACBWR Decommissioning ...........................6 2.11. LC-FS-PR-002, Final Status Survey Package Development ..................................6 2.12. LC-FS-PR-015, Final Status Surveys for Structures ...............................................6 2.13. LC-FS-TSD-002, Operational Derived Concentration Guideline Levels for Final Status Survey .............................................................................................................6
- 3. GENERAL ..............................................................................................................................6 3.1. Responsibilities ...........................................................................................................6 3.2. Definitions...................................................................................................................6 3.3. Acronyms ....................................................................................................................9 3.4. Precautions, Limitations, and Prerequisites ..............................................................10 3.5. Records .....................................................................................................................13
- 4. PROCEDURE ......................................................................................................................13 4.1. Data Validation .........................................................................................................14 4.2. DQO Checklist ..........................................................................................................15 4.3. Preliminary Data Review for FSS.............................................................................16 4.4. Performance of Sign Test..........................................................................................21 4.5. Investigations ............................................................................................................23 4.6. Corrective Actions for Final Status Survey Failure ..................................................26
- 5. ATTACHMENTS and Corresponding tables ...................................................................27 5.1. Attachment 1, Final Status Survey Data Quality Objectives Review Checklist ...27 5.2. Attachment 2, Final Status Survey Preliminary Survey Data Summary ...............27 Page 2 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 5.3. Attachment 3, Dose Significant Radionuclides and Mixture ................................27 5.4. Attachment 4, Final Sr-90 to Cs-137 Surrogate Ratios .........................................27 5.5. Attachment 5, Base Case and Operational DCGLs for Soil..................................27 5.6. Attachment 6, Base Case and Operational DCGLs for Buried Pipe .....................27 5.7. Attachment 7, Base Case and Operational DCGLs for Basements .......................27 5.8. Attachment 8, Base Case and Operational DCGLs for Above Ground Buildings 27 5.9. Attachment 9, Memorandum of Understanding ....................................................27 5.10. Attachment 10, Final Status Survey Investigation Levels ....................................27 5.11. Attachment 11, Sign Statistical Test .....................................................................27 5.12. Attachment 12, a priori Dose Fractions (f) ...........................................................27 5.13. Attachment 13, Final Status Survey Investigation ................................................27 5.14. Attachment 14, Area Factors for Soils ..................................................................27 5.15. Attachment 15, Corrective Actions for Final Status Survey Failure .....................27 5.16. Attachment 16, Remediation, Reclassification and Resurvey Actions .................27 Page 3 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 Summary of Changes:
1.) Minor formatting changes that did not affect the technical content of this procedure.
2.) Revised for consistency with Revision 1 of the License Termination Plan, request for additional information related to the License Termination Plan for the Zion Nuclear Power Station, Units 1 and 2. (TAC Numbers L53045 and L53046) and additional NRC commitments.
3.) Incorporated information applicable to Structure data assessment.
4.) Incorporated Base Case and Operational DCGLs per LC-FS-TSD-002.
5.) Specify additional requirements for resurvey if remediation is performed post-FSS in response to condition report ES-LCR-CR-2017-0073.
Page 4 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1
- 1. PURPOSE AND SCOPE 1.1. Purpose This procedure provides guidance to interpret survey results using the Data Quality Assessment (DQA) process during the assessment phase of Final Status Survey (FSS) at the La Crosse Station Restoration Project (LCSRP). FSS is conducted on above grade and below grade structures (basements), soil (including excavations), and buried piping to demonstrate that residual radionuclide concentrations are equal to or below established Derived Concentration Guideline Levels (DCGL).
1.2. Scope This procedure implements the requirements of applicable U.S. Nuclear Regulatory Commission (NRC) regulations and guidance documents; specifically, NUREG-1757, Volume 2, Revision 1, Consolidated Decommissioning Guidance - Characterization, Survey, and Determination of Radiological Criteria (Reference 2.1), NUREG-1575, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM, Reference 2.2) and Chapter 5 of the LCSRP License Termination Plan (LTP, Reference 2.3).
This procedure applies to all persons involved with the receipt, management, storage and conversion of data collected in support of FSS. The data to be received and processed includes direct download data from instrumentation, counting instrument reports, instrument control and calibration databases, field survey records and other manual entry data. Data processing includes converting measurement data into reporting units, validating instrument applicability and sensitivity, calculating relevant statistical quantities, and verification that all Data Quality Objectives (DQOs) have been met. Following data validation, processing, reduction and evaluation, a Release Record will be generated in accordance with procedure LC-FS-PR-009, Final Status Survey Data Reporting (Reference 2.4).
- 2. REFERENCES 2.1. NUREG-1757, Consolidated NMSS Decommissioning Guidance - Survey, and Determination of Radiological Criteria Volume 2, Revision 1 - September 2002 2.2. NUREG-1575, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM) - August 2000 2.3. La Crosse Station Restoration Project License Termination Plan - December 2014 2.4. LC-FS-PR-009, Final Status Survey Data Reporting 2.5. LC-QA-PN-001, Final Status Survey Quality Assurance Project Plan 2.6. LC-FS-PR-006, Survey Unit Classification 2.7. LC-FS-PR-010, Isolation and Control for Final Status Survey Page 5 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 2.8. LC-FS-PR-009, Final Status Survey Data Reporting 2.9. LC-AD-PR-004, Corrective Action Program 2.10. LaCrosseSolutions Technical Support Document RS-TD-313196-001, Radionuclides of Concern During LACBWR Decommissioning 2.11. LC-FS-PR-002, Final Status Survey Package Development 2.12. LC-FS-PR-015, Final Status Surveys for Structures 2.13. LC-FS-TSD-002, Operational Derived Concentration Guideline Levels for Final Status Survey
Providing overall technical support for the review, validation and interpretation of FSS results and analysis.
Reviewing and approving the conclusions reached for the survey unit from the assessment of the survey data.
Ensuring the conclusions from FSS are appropriately documented and technically defensible.
3.1.2 FSS Supervisor - is responsible for:
Ensuring the survey data taken for FSS is authentic and of sufficient quality.
Ensuring all required surveys have been performed and documented in accordance with the FSS Sample Plan for the survey unit.
The evaluation of FSS data & results using the DQA process.
3.1.3 Graphics/GPS Specialist - is responsible for:
Preparing survey maps, layout diagrams, composite view drawings and other graphics as necessary to support FSS data analysis.
3.1.4 Final Status Survey (FSS) Technician(s) - are responsible for:
Obtaining and documenting survey measurements and samples in accordance with the FSS Sample Plans and all applicable procedures.
3.2. Definitions Page 6 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 3.2.1 A priori - The probability assigned to a parameter or to an event in advance of any empirical evidence, often subjectively or on the assumption of the principal of indifference.
3.2.2 Area Factor (AF) - The factor by which an individual measurement within a specific area can exceed the DCGL, while maintaining compliance with the release criterion. Use of Area Factors only applies to open land survey units.
3.2.3 Biased Measurements - Also referred to as judgmental measurements, biased measurements are performed at locations selected using professional judgment based on unusual appearance, location relative to known contamination areas, high potential for residual radioactivity, general supplemental information, etc.
3.2.4 Data Quality Assessment (DQA) - The scientific and statistical evaluation of data to determine if the data are of the right type, quantity, and quality for the intended use.
3.2.5 Data Quality Objectives (DQO) - Qualitative and quantitative statements derived from the DQO process that clarify study technical and quality objectives, define the appropriate type of data, and specify tolerable levels of potential decision errors that will be used as the basis for establishing the quality and quantity of data needed to support decisions.
3.2.6 Derived Concentration Guideline Level (DCGL) - A derived, radionuclide specific activity concentration within a survey unit corresponding to the release criterion (referred to as Base Case DCGLs). DCGLs are derived from activity/dose relationships through various exposure pathway scenarios.
To ensure that the summation of dose from each source term is 25 mrem/yr.
or less after all FSS is completed, the Base Case DCGLs are reduced based on an expected, or a priori, fraction of the 25 mrem/yr. dose limit from each source term. These reduced DCGLs are called Operational DCGLs. The Operational DCGL is then used as the DCGL for the FSS design of the survey unit (calculation of surrogate DCGLs, investigations levels, etc.).
3.2.7 Elevated Measurement Comparison (EMC) - At LACBWR, the DCGLEMC only applies to open land (soil) survey units. The DCGLEMC is a comparison of measured values against the DCGLW modified to account for small areas where residual radioactivity levels exceed the DCGLW. The DCGLEMC is the acceptable level of residual radioactivity over a small but defined area which meets the site release criterion.
3.2.8 Final Status Survey (FSS) - FSS conducted on soil, buried piping, basement concrete, penetrations, embedded piping and groundwater to demonstrate that residual radionuclide concentrations are equal to or below site-specific DCGLs.
Page 7 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 3.2.9 Frequency Plot - A bar chart of the number of data points within a certain range of values. The frequency plot may reveal any obvious departures from symmetry, such as skewness or bimodality (two peaks), in the data distributions for survey units or background reference areas.
3.2.10 Histogram - A graphical representation of the distribution of numerical data.
It is an estimate of the probability distribution of a continuous variable (quantitative variable).
3.2.11 Investigation Level - A derived media-specific, radionuclide-specific concentration or activity level of radioactivity that: 1) is based on the release criterion, and 2) triggers a response, such as further investigation or cleanup, if exceeded.
3.2.12 Mean - The average value of the data set, obtained when the sum of the individual measurements is divided by the number of measurements.
3.2.13 Median - The center of the data set when data points are ranked in order from smallest to largest. The median is the center data point if the data set contains an odd number of values or the average of the two center data points if the data set contains an even number of values.
3.2.14 Minimum Detectable Concentration (MDC) - The Minimum Detectable Concentration (MDC) is defined as the a priori activity level that a specific instrument and technique can be expected to detect 95% of the time. When stating the detection capability of an instrument, this value should be used.
The MDC is the detection limit, (LD), multiplied by an appropriate conversion factor to give units of activity. The critical level, (LC), is the lower bound on the 95% detection interval defined for LD and is the level at which there is a 5% chance of calling a background value greater than background. This is the value used when actually counting samples or making direct radiation measurements. Any response above this level should be considered as above background (i.e., a net positive result). This will ensure 95% detection capability for LD. The MDC is dependent upon the counting time, geometry, sample size, detector efficiency and background count rate.
3.2.15 Nonparametric Statistical Test - A test based on relatively few assumptions about the exact form of the underlying probability distributions of the measurements. As a consequence, nonparametric statistical tests are valid for a fairly broad class of distributions. The Sign Test is an example of a nonparametric test.
3.2.16 Outlier - A measurement that is unusually large or small relative to the rest and therefore is suspected of misrepresenting the population from which it was collected.
Page 8 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 3.2.17 Posting Plot - A map of the survey unit with the data values entered at the measurement locations. The posting plot can reveal spatial non-homogeneities in the survey unit such as patches of elevated residual radioactivity or groupings of measurements that exceed the DCGLW.
3.2.18 Quantile Plot - A plot used to diagnose asymmetry in a data set. A quantile plot is constructed by ranking the data from smallest to largest. Each data value is plotted against the percentage of the data set with that value or less.
3.2.19 Range - The measure of the difference between the largest and smallest values in the data set.
3.2.20 Sign Test - A nonparametric statistical test used to demonstrate compliance with the site release criterion when the radionuclide of interest is not present in background or constitutes a small fraction of the DCGLW.
3.2.21 Standard Deviation - The measure of the variability around the mean of the data set.
3.2.22 Structure (for the purposes of this procedure) - Above grade and below grade (basements) portions of buildings that will remain on site at the time of license termination.
3.2.23 Sum-of-Fractions - The Sum-of-Fractions (SOF) or unity rule is applied in FSS survey planning, data evaluation and statistical tests since multiple radionuclide-specific measurements may 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 DCGL (used for non-parametric statistical tests) becomes one (1).
3.3. Acronyms Type I Error Probability Type II Error Probability Standard Deviation (sigma)
AAF Area Adjustment Factor AF Area Factor LT License Termination CoC Chain-of-Custody DCGL Derived Concentration Guideline Level DQA Data Quality Assessment DQO Data Quality Objectives Page 9 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 EMC Elevated Measurement Comparison FOV Field of View FSS Final Status Survey HTD Hard-to-Detect ISOCS In-Situ Object Counting System LCSRP LaCrosse Station Restoration Project LTP License Termination Plan MARSSIM Multi-Agency Radiation Survey and Site Investigation Manual MDC Minimum Detectable Concentration NIST National Institute of Standards and Technology NRC US Nuclear Regulatory Commission QA Quality Assurance QAPP Quality Assurance Project Plan QC Quality Control ROC Radionuclides-of-Concern SOF Sum-of-Fractions TSD Technical Support Document 3.4. Precautions, Limitations, and Prerequisites 3.4.1 Precautions
- a. Documents and databases containing FSS data are Quality Assurance (QA) records when complete. Positive control of this data shall be maintained in accordance with section 2.5.2 of LC-QA-PN-001 Final Status Survey Quality Assurance Project Plan (Reference 2.5).
- b. When documenting survey information, all personnel shall ensure that all QA records are of good quality and legible. Legibility is determined to be readable and reproducible.
- c. Direct access to FSS data shall be limited to personnel authorized by the RP/
FSS Manager.
- d. The required areal coverage for a Class 1 basement survey unit is 100%.
Sufficient measurements must be taken in Class 1 FSS units to ensure that 100% of the surface area is surveyed (e.g. ISOCS FOV will be overlapped to ensure that there are no un-surveyed corners and gaps). If 100% areal coverage cannot be achieved in a Class 1 basement survey unit, then notify the RP/FSS Manager.
Page 10 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1
- e. For laboratory analysis, MDCs less than 10% of the Operational DCGL are preferable while MDCs up to 50% of the Operational DCGL are acceptable.
The MDC for measurements obtained using field instruments will be 50 percent of the applicable Operational DCGL. Instruments used for scan measurements in Class 1 surface soil areas are required to be capable of detecting radioactive material at the DCGLEMC.
- f. When assessing FSS results, the analysis of the structures must be below the Base Case DCGLs that are used to demonstrate compliance with the 25 mrem/yr. unrestricted release criterion. Default screening values from NUREG-1757, Appendix H, Table 1, are applied to above grade structures that will remain at the time of license termination. The survey plans for structures were designed based upon use of the Sign Test for data analysis.
- g. Remediation, Reclassification, and Resurvey
- i. Re-classification of a survey unit from a less restrictive classification to a more restrictive classification shall be performed in accordance with procedure LC-FS-PR-006, Survey Unit Classification (Reference 2.6).
ii. A survey unit may not be reclassified to a lesser classification (e.g. from a Class 1 to a Class 2 or from a Class 2 to a Class 3) without RP/ FSS Manager approval.
iii. The decision to separate out and reclassify a new survey unit due to the presence of elevated residual radioactivity with the remainder of the original survey unit retaining its original classification should consider the following; A. The assumptions made as to how the original survey unit was classified.
B. The postulated cause of the elevated residual radioactivity.
C. The possibility for other similar areas within the original survey unit having gone undetected.
D. The extent of the elevated residual radioactivity (and corresponding remediation) relative to the total area of the original survey unit.
3.4.2 Limitations
- a. All attachments described in this procedure may be generated electronically.
If electronic attachments are used, the physical layout of the attachment may be modified provided the intent described in this procedure is not changed.
- b. Data accepted as the FSS of record shall be reviewed to verify they are authentic, appropriately documented, and technically defensible.
Page 11 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 NOTE Prior to issuing the order to backfill an excavation or sub-grade basement, at a minimum the RP/FSS Manager shall verify that the requirements of 3.4.2.c have been met, AND obtain concurrence from the NRC Project Manager that the survey unit is suitable for backfill.
- c. Survey data may be accepted as FSS data provided the following requirements are met:
- i. Methodology, techniques, and quality controls required for the FSS have been applied and achieved.
ii. No further remediation will be performed in the survey unit or, if remediation is performed, then the remediation that occurs will be localized in nature, all resultant contamination material will be controlled, and the area impacted by the remediation activity will be re-scanned and re-sampled (see Attachment 16).
iii. Isolation and control measures have been implemented and maintained in accordance with procedure LC-FS-PR-010, Isolation and Control for Final Status Survey (Reference 2.7).
- d. Use of Graphics for Data Evaluation
- i. A frequency plot is useful where anomalies in the data are encountered or where the data distribution is otherwise suspected to depart from symmetry.
ii. A posting plot and histogram can be useful as part of an investigation survey where one or more direct measurements or volumetric samples exceed the DCGL.
iii. Other graphical data representation tools may be used, as appropriate, to examine the general shape of the data distribution or to identify spatial patterns, relationships, or potential anomalies in the data that might go unnoticed using purely numerical methods.
- e. In order to close a FSS sample plan, a survey unit release record will be prepared for each survey unit within the survey area in accordance with procedure LC-FS-PR-009, Data Reporting (Reference 2.8).
3.4.3 Prerequisites
- a. Computer based programs developed to assist in calculating FSS data (i.e.
Excel spreadsheets) shall be tested to verify and validate that the calculations are correct before they are used.
- b. Any field copies of data collection forms generated in support of FSS implementation shall be filed with the applicable survey package.
Page 12 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1
- c. Soil samples and concrete cores will be collected at 10% of the systematic sample locations during FSS to confirm the HTD to surrogate radionuclide ratios.
ii. For soil samples or concrete cores with positive results for both a HTD ROC and the corresponding surrogate radionuclide (Cs-137 or Co-60), the HTD to surrogate ratio will be calculated.
iii. The maximum ratio from characterization (see Attachment 4) will be used for the surrogate calculation unless the survey information from the soil sample(s) (positive results for both a HTD ROC and the corresponding surrogate radionuclide) supports the use of a surrogate ratio that is specific to the area. In these cases, the area-specific ratios will be determined by the actual survey data in lieu of the maximum ratios. The area-specific ratios used and the survey data serving as the basis for the ratios will be documented in the Sample Plan and the Release Record.
- d. If levels of residual radioactivity in an individual measurement/sample(s) exceed a Sum-of-Fractions (SOF) of 0.1 (using Operational DCGLs), then the measurement/sample(s) will be analyzed for HTD ROC (Sr-90).
- e. In Class 1 open land survey units, a subsurface soil sample shall be taken at 10% of the systematic surface soil sample locations in the survey unit with the location(s) selected at random.
- f. When assessing grade-level land area FSS results, if the analysis of a surface soil sample, or the results of a surface gamma scan indicates the potential presence of residual radioactivity at a concentration of 75% of the Operational DCGL for soil, then additional biased subsurface soil sample(s) shall be taken to the appropriate depth within the area of concern as part of the investigation.
3.5. Records 3.5.1 Attachment 1, Final Status Survey Data Quality Objectives Review Checklist 3.5.2 Attachment 2, FSS Preliminary Survey Data Summary 3.5.3 Attachment 11, Sign Statistical Test 3.5.4 Attachment 13, Final Status Survey Investigation 3.5.5 Attachment 15, Corrective Actions for Final Status Survey Failure
- 4. PROCEDURE Page 13 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 4.1. Data Validation 4.1.1 Ensure that the survey area and survey unit for which the data is relevant is clearly marked on the data report.
4.1.2 Perform a validation of the survey data to ensure the data results are authentic, realistic and valid. Assess each specific sample or measurement result individually. Data validation includes the following;
- a. Verify that the unique sample identification number for each sample or measurement is consistent between the sample analysis report, the Chain-of-Custody (CoC) form, the FSS Sample Plan and/or the survey instructions.
- b. Verify that the recorded sample date & time for each sample or measurement is consistent with the CoC form (if applicable) and the survey record or download data.
- c. Verify that the data is complete and that there are no missing results or supporting data, including but not limited to MDC, uncertainty, background, Field-of-View (FOV), geometry or methods of analysis.
- d. Verify that the MDC of the instrument used for analysis was adequate to detect all ROC or gross activity at the target MDC values specified in the FSS Sample Plan for that survey unit.
NOTE When performing an FSS in an excavation, the individual performing data validation shall be cognizant of data anomalies that may be indicative of a source term at a greater depth than the excavation. For example, if all scan readings are in the 10k cpm to 13k cpm range but an area shows 20k cpm, although the 20k cpm may be below the investigation levels, the anomalous reading may warrant an investigation to verify there is no source term at a greater depth.
- e. Verify the absence of anomalies in the sample or measurement results, or in the supporting data, including but not limited to MDC, uncertainty, deviation from established procedure or analysis flags.
- f. For data collected with a data logging instrument, verify the data has been downloaded with a unique file name.
4.1.3 For the assessment of FSS, present survey data results in units appropriate for comparison to the DCGL (pCi/m2 for basement structures, pCi/g for soil and dpm/100cm2 for above grade structures and buried pipe). As applicable, convert the units for the reported data to the DCGL units by correcting for survey instrument background, efficiency, geometry, detector area, and/or measurement size.
Page 14 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 4.1.4 Indicate the analysis or measurement results have been validated by signing and dating on the cover of the analysis or survey report.
4.1.5 Once analysis or measurement results have been validated, place the documentation in the survey unit package for FSS data evaluation.
4.1.6 If an analysis result, measurement or set of data cannot be validated (accepted), then notate the sample or measurement result in question. The reviewer shall place their initials next to the measurement or sample in question and notify the RP/FSS Manager.
- a. The RP/FSS Manager or designee shall:
- i. Consider initiating an investigation into the reason or cause in accordance with LC-AD-PR-004, Corrective Action Program (Reference 2.9).
ii. Assess the verified data for the survey unit in order to make a determination if the remaining data is sufficient to meet the DQOs for that survey unit.
iii. Direct the acquisition of additional measurements or samples as necessary if the remaining data is insufficient to continue FSS (see Attachment 16).
4.2. DQO Checklist 4.2.1 Initiate Attachment 1, Final Status Survey Data Quality Objectives Review Checklist when notified that all samples and measurements required by the FSS Sample Plan and survey instructions have been taken or acquired.
4.2.2 Using the checklist, review the FSS Sample Plan, the sample instructions, the Field Notes, survey records and/or data analyses reports to ensure that the DQOs used for the survey design are applicable and valid.
4.2.3 Ensure that the narrative presented in the FSS Sample Plan is consistent, that any deviations from the sample instructions are fully explained and all requisite information necessary to present the narrative is included in the FSS Sample Plan.
4.2.4 If the review identifies discrepancies, then document any corrective actions that were taken to resolve the discrepancy.
4.2.5 If discrepancies remain that are unresolved, then forward the documentation to the RP/FSS Manager for completion.
- a. The RP/FSS Manager or designee shall;
- i. Assess the data that has been impacted by the discrepancy to determine if the data remains valid.
Page 15 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ii. Assess the remaining data that has not been impacted by the discrepancy to make a determination if the remaining data is sufficient to meet the DQOs for that survey unit.
iii. Consider initiating an investigation into the reason or cause in accordance with LC-AD-PR-004, Corrective Action Program (Reference 2.9).
iv. Direct the acquisition of additional measurements or samples as necessary if the remaining data is insufficient to continue FSS.
4.3. Preliminary Data Review for FSS NOTE Appropriate units must be added to the header in Attachment 2, FSS Preliminary Survey Data Summary contingent upon the type of FSS performed (open land, basement surface, buried pipe, etc.). Preliminary data review can also be processed using alternate formats, pre-programmed computer databases, computer spreadsheets, electronic calculators and hand calculations provided that all requisite data is included.
4.3.1 Using Attachment 2, FSS Preliminary Survey Data Summary or an equivalent form, prepare a summary of the survey data that will be used for FSS for the survey unit, including scan survey results, any judgmental samples that were taken and any investigation measurements or samples that were taken as a result of elevated scan measurements.
4.3.2 On Attachment 2 or equivalent, list all samples or measurements taken to meet the systematic survey design from the FSS Sample Plan.
NOTE The actual recorded value will be used as the recorded FSS result for measurement and/or sample values that are less than MDC. Negative values will be recorded as zero. The recorded value for the highest percent abundance will be used for reported results for radionuclides with multiple gamma energies.
- a. List the measured activity for each gamma-emitting ROC.
- b. List all relevant information such as date, sample or measurement location (x and y axis), sample weight (if applicable) and measurement FOV (if applicable).
- i. Ensure all measurements are reported in the correct units. Measurements taken on Basement surfaces are typically gross gamma measurements in units of pCi/m2. Measurements in buried pipe are typically gross gamma measurements reported in units of dpm/100cm2. Analytical data for soil samples are reported in units of pCi/g.
Page 16 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 NOTE The final ROC are Co-60, Cs-137, Eu-152 and Eu-154, which are gamma emitters and Sr-90, which is a HTD radionuclide. Attachment 3 presents the final suite of ROC for the decommissioning of LACBWR and the normalized mixture fractions based on the radionuclide distribution for all site structures.
The mixture applies to all basement structures, pipe and soil.
ii. Document the measurement/sample concentrations of dose-significant gamma emitting ROC (Co-60, Cs-137, Eu-152 and Eu-154).
A. If reported as a gross gamma measurement, then derive concentration contribution from individual gamma emitting ROC (Co-60, Cs-137, Eu-152 and Eu-154) using applicable normalized gamma mixture from Attachment 3.
iii. When assessing FSS results, verify that no plant-derived gamma emitting radionuclides other than the dose-significant gamma emitting ROC (Co-60, Cs-137, Eu-152 and Eu-154) are identified at concentrations greater than MDC.
A. If a plant-derived gamma emitting radionuclide other than the ROC were identified at concentrations greater than MDC, then perform an investigation to assess the dose significance of the identified radionuclide. Consider obtaining additional samples as part of the investigation.
NOTE The mean, maximum and 95% Upper Confidence Level (UCL) of the surrogate ratios for concrete core samples taken in the Containment, WGTV and WTB basements were calculated in LaCrosseSolutions Technical Support Document RS-TD-313196-001, Radionuclides of Concern During LACBWR Decommissioning (Reference 2.10) and are presented in Attachment 4.
iv. Using the radionuclide mixture ratios applicable to the survey unit, infer HTD ROC by a surrogate approach or by direct scaling.
A. Cs-137 is the principle surrogate radionuclide for Sr-90.
B. The maximum ratios will be used in the surrogate calculations during FSS unless area specific ratios are determined by continuing characterization.
C. If area specific ratios are used, the ratios and the basis for their use will be documented in the FSS Sample Plan and the Release Record.
Page 17 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 1.2 4.3.3 Calculate the Sum-of-Fractions (SOF) for each sample or measurement.
NOTE LC-FS-TSD-002, Operational Derived Concentration Guideline Levels for FSS (Reference 2.23) provides the DCGLs used for FSS. Attachment 5 presents the Base Case and Operational DCGLs for soils (DCGLS).
Attachment 6 presents the Base Case and Operational DCGLs for buried pipe (DCGLBP). Attachment 7 presents the Base Case and Operational DCGLs for basement structures (DCGLB). Attachment 8 presents the Base Case and Operational DCGLs for above grade buildings (DCGLAGB).
For multiple radionuclides, the unity rule applies.
NOTE If a surrogate DCGL was calculated as part of the survey design for the FSS (section 5.4.4 of LC-FS-PR-002, Final Status Survey Package Development
[Reference 2.11]), then the surrogate DCGL calculated will be used for the selected surrogate radionuclide. HTD ROC radionuclide concentration(s) can also be derived through direct scaling.
- a. Denote the appropriate DCGL(s) value for each ROC.
NOTE Operational DCGL values are used to determine measurement SOF.
- b. Calculate a SOF for each sample or measurement by dividing the reported concentration by the Operational DCGL. If a sample has multiple ROCs, then the SOF for each ROC will be summed to provide a total SOF for the sample or measurement.
- i. If the SOF for one or more individual sample(s) or measurement(s) is greater than one in a Class 1 or Class 2 FSS unit, or greater than 0.5 in a Class 3 FSS unit, then:
A. Notify the RP/FSS Manager.
B. Initiate an investigation in accordance with step 4.5. This may include the acquisition of additional measurements to bound the area of elevated activity.
C. Perform an assessment to determine if the basis for the current classification of the survey unit is still valid. If it is determined that the classification basis is no longer valid, then proceed to step 4.6.
ii. If the SOF for all individual samples or measurements is less than one in a Class 1 or Class 2 FSS unit, or less than 0.5 in a Class 3 FSS unit, then proceed to next step.
Page 18 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 NOTE For soil survey units, if both surface (grade to 1 meter below grade) and subsurface (greater than 3.28 feet below grade) soil samples are taken, then statistical data will be determined for each stratum that was sampled as part of the statistical sample population.
NOTE For FSS, only samples or measurements taken as part of the systematic sample population for the survey unit are used to derive statistical data. Biased, judgmental and/or investigation samples are compared directly against the respective Operational DCGL.
4.3.4 Derive and list the basic statistical data for each analyzed radionuclide or direct measurement in the systematic sample population to be used to demonstrate compliance for the survey unit. At a minimum, the statistics will include:
Minimum concentration for each ROC in the data set.
Maximum concentration for each ROC in the data set.
Mean concentration for each ROC in the data set.
Median concentration for each ROC in the data set.
Standard deviation for each ROC in the data set.
4.3.5 For soil samples, compare the mean concentration for each ROC in the data set against the Memorandum of Understanding criteria presented in Attachment 9 (Industrial/Commercial Soil Concentrations). If the mean concentration of any ROC is greater than the values presented in Attachment 9, then stop data assessment and notify the RP/FSS Manager. The RP/FSS Manager shall notify EnergySolutions senior management.
4.3.6 Assess the scan survey results for the survey unit.
NOTE When performing an FSS in an excavation, the individual performing data validation shall be cognizant of data anomalies that may be indicative of a source term at a greater depth than the excavation. For example, if all scan readings are in the 10k cpm to 13k cpm range but one area shows 20k cpm, although the 20k cpm may be below the investigation levels, the anomalous reading may warrant an investigation to verify there is no source term at a greater depth.
Page 19 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1
- a. Compare the reported scan results to the appropriate scan investigation level for the survey unit. Scan investigation levels are presented in Attachment 10.
- b. If a scan measurement exceeds an investigation level, then ensure that a biased sample or measurement was taken at the flagged location.
4.3.7 Denote the results of any biased or judgmental samples and/or measurements taken in the survey unit.
- a. Divide the concentration for each ROC by the Operational DCGL for the ROC to derive a SOF for determining if an investigation is warranted. If a sample has multiple ROCs, then the SOF for each ROC will be summed to provide a total SOF for the sample/measurement.
- i. If the SOF for one or more individual sample(s) or measurement(s) is greater than one in a Class 1 or Class 2 FSS unit, or greater than 0.5 in a Class 3 FSS unit, then:
A. Notify the RP/FSS Manager.
B. Initiate an investigation in accordance with step 4.5. This may include the acquisition of additional measurements to bound the area of elevated activity.
C. Perform an assessment to determine if the basis for the current classification of the survey unit is still valid. If it is determined that the classification basis is no longer valid, then proceed to step 4.6.
ii. If the SOF for all individual judgmental samples or measurements are less than one in a Class 1 or Class 2 FSS unit, or less than 0.5 in a Class 3 FSS unit, then proceed to next step.
4.3.8 Calculate the mean dose for the survey unit based on the mean concentration from each ROC.
- a. Divide the mean concentration derived in step 4.3.4 by the Base Case DCGL for the ROC to derive a mean SOF for each ROC.
- b. Sum the SOF for each ROC to derive the mean SOF for the survey unit.
- c. Multiply the mean SOF by 25 mrem/yr. to derive the mean dose for the survey unit in units of mrem/yr.
4.3.9 Prepare a map for the survey unit that includes the following information:
- a. The survey unit boundaries.
Page 20 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1
- b. The locations corresponding to the coordinates for each systematic measurement or sample.
- c. The locations corresponding to the coordinates where any elevated scan measurements were detected.
- d. The locations corresponding to the coordinates for each biased or investigation measurement or sample.
NOTE Refer to section 8.2.2.2 of MARSSIM (Reference 2.2) for examples and methods for the graphical representation of data.
4.3.10 Display the data using graphical representation by creating a posting plot, a Quantile plot and a Histogram.
4.4. Performance of Sign Test.
NOTE Statistical testing will only be applied to the systematic sampling and/or measurement populations. For soil survey units, the statistical test will be performed on the systematic sample population that represents the as-left grade of the surface soil.
4.4.1 If every measurement in the systematic sample population is less than or equal to the applicable Operational DCGL, or has a SOF less than one, then a statistical test is not required and proceed to step 4.5.2.
NOTE For FSS, the Sign Test will be used to evaluate the remaining residual radioactivity in each survey unit against the applicable Operational DCGL.
The Sign Test is the most appropriate test for LCSRP FSS results because background is expected to constitute a small fraction of the DCGL.
4.4.2 Perform the Sign test as follows:
NOTE Attachment 11, Sign Statistical Test, or an equivalent form can be used to document the performance of the Sign test. Data can also be processed using one or more of the following methods: the use of pre-programmed computer databases, computer spreadsheets, electronic calculators and hand calculations.
- a. List the survey unit measurements, 1, 2, 3, n; where n = the number of measurements.
Page 21 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 NOTE Gross activity measurements taken on structural surfaces will be corrected for material specific gross background activity.
- b. List the summed SOF for each measurement from step 4.3.3(b) as the weighted sum (WS).
- c. Subtract the weighted sum (Ws) from unity (one) to obtain the difference.
- d. Discard differences where the value is exactly zero and reduce n by the number of such zero measurements.
- e. Count the number of positive differences. The result is the test statistic S+,
or critical value.
NOTE In accordance with LTP Chapter 5, the Type I decision error that was used for FSS design was set at 0.05
- f. Compare the value of S+ to the critical values in Table I.3 of MARSSIM.
Critical values may also be calculated using the following equation:
a.
1.645
= +
2 2 Where:
N = Number of Samples
- i. If S+ is greater than or equal to the critical value for the Type 1 Error (),
then the null hypothesis can be rejected and the survey data set passes the Sign Test.
ii. If S+ is less than the critical value, then the survey data set fails the Sign Test.
4.4.3 If the survey unit passes the statistical test, then the FSS Release Record for this survey unit may be generated in accordance with procedure LC-FS-PR-009, Final Status Survey Data Reporting. If the survey unit fails the statistical test, then inform the RP/FSS Manager and further analyze the data to determine why the statistical test failed.
- a. If it appears that the failure is caused by the presence of radioactivity concentrations that will require further remediation, then proceed to step 4.5.
Page 22 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1
- b. If it appears that the failure is due to statistical fluctuations, then the survey unit may be resurveyed and another set of discrete measurements or samples collected for statistical analysis. A larger number of measurements may increase the probability of passing the statistical test if the survey unit actually meets the site release criterion.
- c. If it appears the power of the test is insufficient due to the number of measurements, then a retrospective power analysis for the test may be performed as described in Appendices I.9 and I.10 of MARSSIM to determine if additional data may be collected and included in the data set.
4.5. Investigations NOTE If the survey unit is a Basement FSS unit, Buried Pipe FSS unit or designated as an Open Land Class 2 or Class 3 FSS unit, then an Elevated Measurement/Sample is defined as residual radioactivity in concentrations greater than the Operational DCGLs (or 0.5 times the Operational DCGL in a Class 3 FSS unit). In a Class 1 Open Land FSS unit, the Elevated Measurement Comparison is applicable. In both scenarios, the Base Case DCGLs are used in this calculation.
4.5.1 If the survey unit fails the statistical test or, if a measurement/sample(s) exceeds the FSS Investigation Levels presented in Attachment 10 or, if the mean SOF for the survey unit exceeds one or, if the mean SOF exceeds the a priori fractions used for survey design in Attachment 12 or, if the sum of the mean SOF for all FSS units in a basement exceeds one, then proceed to step 4.5.3.
4.5.2 If the survey unit has passed the statistical test, and does not have any volumetric sample, scan or static measurements in excess of the investigation levels, and the mean SOF is less than the a priori fraction used for survey design in Attachment 12, then commence the generation of the FSS Release Record for this survey unit in accordance with procedure LC-FS-PR-009, Final Status Survey Data Reporting.
NOTE At LCSRP, Elevated Measurement Comparison (EMC) only applies to Class 1 open land survey units.
NOTE Investigation(s) can also be processed using alternate formats, pre-programmed computer databases, computer spreadsheets, electronic calculators and hand calculations provided that all requisite data is included.
Page 23 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 4.5.3 If the results of the FSS require an investigation, then initiate Attachment 13, Final Status Survey Investigation or equivalent.
4.5.4 Document the reason for the investigation.
4.5.5 List the locations and sample or measurement results that exceed the investigation levels.
4.5.6 Using the sample or measurement coordinates or locations, assess if the elevated area has been adequately bounded. If the elevated area has not been adequately bounded, then take additional samples or measurements as necessary to establish the boundaries of the elevated area.
NOTE Use of location plots on a map of the survey unit is an effective tool to determine bounding and area size.
4.5.7 List the bounding samples or measurements for each elevated area.
4.5.8 If the survey unit is designated as Class 2, then proceed to step 4.5.10. If the survey unit is designated as Class 3, then proceed to step 4.5.11. If the survey unit is designated as Class 1, then perform an investigation as follows:
- a. In each elevated area, denote the Base Case DCGL for each ROC pertinent to the elevated sample(s).
- b. Calculate an area in square meters for the identified elevated area(s).
NOTE Attachment 14 presents the Area Factors (AF) for surface soils.
- c. If the survey unit is a Class 1 open land survey unit, then select the appropriate Area Factor (AF) from Attachment 14 that corresponds to the elevated area and to the radionuclide with the elevated activity.
- d. For all other survey units (Basements, Buried Pipe or Open Land FSS units classified as Class 2 or Class 3), calculate an Area Adjustment Factor (AAF) for the elevated area by dividing the survey unit size in m2 by the area of the elevated area in m2.
- e. Calculate an adjusted DCGL (or DCGLEMC for Class 1 soils) for each applicable ROC in each elevated area by multiplying the applicable Base Case DCGL by the AF or AAF as appropriate.
Page 24 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 NOTE The Average Radioactivity Fraction (fAVG) is calculated using only sample results from the systematic sample population that are located outside of any identified elevated area.
- f. Sum the products of the average concentration for each ROC divided by its respective Base Case DCGL to derive the Average Radioactivity Fraction (fAVG) for the survey unit.
- g. Calculate an Elevated Radioactivity Fraction (fELEV) for each identified elevated area.
- i. Determine the average concentration (j) for each ROC in each identified elevated area.
ii. Subtract the average concentration for each ROC (j) for the survey unit from step 4.5.8(f) from the average concentration (j) for each ROC in each identified elevated area from step 4.5.8(g)i.
iii. Divide the elevated area ROC concentration (j-j) by the adjusted DCGL (or DCGLEMC for Class 1 soils) from step 4.5.8(e) to derive a Fraction of DCGLELEV (fROC) for each radionuclide.
iv. Sum the Fraction of DCGLELEV (felev) values for each pertinent radionuclide to derive the Elevated Radioactivity Fraction (fELEV) for the elevated area.
- h. Sum the Elevated Radioactivity Fractions (fELEV) for each elevated area.
- i. Add the Average Radioactivity Fraction (fAVG) from step 4.5.8(f) to the summed Elevated Radioactivity Fractions (fELEV). This value represents the mean SOF for this survey unit.
- j. Compare the mean SOF for the survey unit with the a priori fractions used for survey design in Attachment 12.
- k. Multiply the SOF by 25 mrem/yr. This is the assigned dose to this survey unit, adding the dose from elevated areas to the mean of the systematic measurements/samples.
Page 25 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 4.5.9 If the survey unit is classified as FSS Class 1, and the mean SOF for the survey unit is greater than unity (1) or, if the mean SOF exceeds the a priori fraction used for survey design in Attachment 12, then proceed to step 4.6. If mean SOF is less than or equal to unity (1) and, less than the a priori fraction used for survey design in Attachment 12, then the survey unit will pass FSS, the investigation is complete and the and the FSS Release Record for this survey unit may be generated in accordance with procedure LC-FS-PR-009, Final Status Survey Data Reporting.
4.5.10 If the survey unit is classified as a FSS Class 2 survey unit, and any biased or investigative sample or measurement taken in the survey unit is equal to or greater than its respective Operational DCGL or, if the mean SOF exceeds the a priori fraction used for survey design in Attachment 12 then proceed to step 4.6 If the action level has not been exceeded, and, if the mean SOF is less than the a priori fraction used for survey design in Attachment 12, then the investigation is complete and the FSS Release Record for this survey unit may be generated in accordance with procedure LC-FS-PR-009, Final Status Survey Data Reporting.
4.5.11 If the survey unit is classified as a FSS Class 3 survey unit, and any biased or investigative sample or measurement taken in the survey unit is equal to or greater than 50% of its respective Operational DCGL or, if the mean SOF exceeds the a priori fraction used for survey design in Attachment 12, then proceed to step 4.6. If the action level has not been exceeded and, if the mean SOF is less than the a priori fraction used for survey design in Attachment 12, then the investigation is complete and the FSS Release Record for this survey unit may be generated in accordance with procedure LC-FS-PR-009, Final Status Survey Data Reporting.
4.6. Corrective Actions for Final Status Survey Failure 4.6.1 If the survey unit did not pass FSS, then initiate Attachment 15, Corrective Actions for Final Status Survey Failure or equivalent. Attachment 16, Remediation, Reclassification and Resurvey Actions, provides potential corrective actions that may be taken as corrective actions for the FSS failure of a survey unit. These corrective actions may require remediation, reclassification, and/or resurvey.
4.6.2 Submit completed form to the RP/FSS Manager for approval.
4.6.3 When the RP/FSS Manager has approved the corrective action, then prepare a revision (addendum), as appropriate, to the FSS Survey Plan in accordance with LC-FS-PR-002, Final Status Survey Package Development. If any new survey units were created from existing survey units, then prepare a new survey design in accordance with LC-FS-PR-002, Final Status Survey Package Development.
Page 26 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1
- 5. ATTACHMENTS AND CORRESPONDING TABLES 5.1. Attachment 1, Final Status Survey Data Quality Objectives Review Checklist 5.2. Attachment 2, Final Status Survey Preliminary Survey Data Summary 5.3. Attachment 3, Dose Significant Radionuclides and Mixture 5.4. Attachment 4, Final Sr-90 to Cs-137 Surrogate Ratios 5.5. Attachment 5, Base Case and Operational DCGLs for Soil 5.6. Attachment 6, Base Case and Operational DCGLs for Buried Pipe 5.7. Attachment 7, Base Case and Operational DCGLs for Basements 5.8. Attachment 8, Base Case and Operational DCGLs for Above Ground Buildings 5.9. Attachment 9, Memorandum of Understanding 5.10. Attachment 10, Final Status Survey Investigation Levels 5.11. Attachment 11, Sign Statistical Test 5.12. Attachment 12, a priori Dose Fractions (f) 5.13. Attachment 13, Final Status Survey Investigation 5.14. Attachment 14, Area Factors for Soils 5.15. Attachment 15, Corrective Actions for Final Status Survey Failure 5.16. Attachment 16, Remediation, Reclassification and Resurvey Actions Page 27 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 1 FINAL STATUS SURVEY DATA QUALITY OBJECTIVES REVIEW CHECKLIST Page 1 of 2 Survey Area: No.
Description:
Survey Unit: No.
Description:
Classification:
Reviewer: Date: Time:
Have all measurements and/or analysis results that will be subjected to data
- 1. analysis for FSS been individually reviewed and validated in accordance with step 4.1 of this procedure? Yes No (explain)
Have all systematic measurements and/or samples been taken or acquired at
Have all scans surveys been performed of the areas specified as required in the 3.
FSS Survey Plan and the FSS Sample Instructions? (applicable to FSS only) Yes No (explain)
Was a meter circumference scanned around each systematic sample or 4.
measurement location? (applicable to Land survey units only) Yes No (explain)
Have all biased measurements and/or samples been taken or acquired at the 5.
locations specified in the FSS Survey Plan & the FSS Sample Instructions? Yes No (explain)
Have duplicate and/or split samples or measurements been taken or acquired at 6.
each location designated as a QC sample? Yes No (explain)
Were the instruments used to measure or analyze the survey data capable of
- 7. detecting the ROCs or gross activity at a MDC less than the specified target MDC? Yes No (explain)
Are the MDCs and the assumptions used to develop the MDCs appropriate for 8.
the instruments and methods used to analyze the data? Yes No (explain)
Was the calibration of all instruments that were used to measure or analyze 9.
data, current at the time of use? Yes No (explain)
Were the instruments successfully response-checked before use and, where 10.
required, after use on the day the data was measured? Yes No (explain)
Was the custody of samples collected for laboratory analysis tracked from the 11.
point of collection until final results were obtained? Yes No (explain)
Do the QC sample results meet the acceptance criteria as specified in LC-QA-
- 12. PN-001, Final Status Survey Quality Assurance Project Plan(QAPP)(Reference 2.5) Yes No (explain)
If No was the response to any of the questions above, then document the discrepancy as well as any corrective actions that were taken to resolve the discrepancy.
Page 28 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 1 FINAL SURVEY DATA QUALITY OBJECTIVES REVIEW CHECKLIST Page 2 of 2 Survey Area: No.
Description:
Survey Unit: No.
Description:
Discrepancy; Corrective Actions Taken;
- 13. Have the corrective actions resolved the discrepancies with the data? Yes No
- a. If the answer to question 13 was No, then is the affected data still valid?
Yes No
- b. If No, then are the existing valid measurements or samples sufficient to demonstrate compliance for the survey unit? Yes No
- c. If No, then direct the acquisition of additional measurements or samples as necessary to demonstrate compliance for the survey unit.
Prepared by (FSS Supervisor):
(Print Name) (Signature) (Date)
Approved by:
(RP / FSS Manager) (Signature) (Date)
Page 29 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 2 FSS PRELIMINARY SURVEY DATA
SUMMARY
Page 1 of 3 SYSTEMATIC MEASUREMENTS FSS Unit Description Classification Type Structural Surface Surface Area m2 Description Location Measured Inferred Operational FOV Fraction of DCGLOPS Sample ID ID# ROC Activity Ratio Activity DCGL 2 2 2 2 DCGLOPS SOF (Grid No.) (m ) (pCi/m ) (pCi/m ) (pCi/m )
Cs-137 Co-60 Eu-152 Eu-154 Sr-90 Cs-137 Co-60 Eu-152 Eu-154 Sr-90 Cs-137 Co-60 Eu-152 Eu-154 Sr-90 Page 30 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 2 FSS PRELIMINARY SURVEY DATA
SUMMARY
Page 2 of 3 SYSTEMATIC MEASUREMENT STATISTICS Max Individual Systematic Measurement SOF = Mean Systematic Measurement SOF =
Number of Systematic Measurements = Number of Systematic Measurements with SOF >1 =
Number of QC Measurements = # of Measurements with SOF >0.1 (HTD Assessment) =
Systematic Mean Median Max Min BcDCGL Avg SOF Avg Dose per ROC (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) per ROC ROC Cs-137 Co-60 Eu-152 Eu-154 Sr-90 SOF ASSIGNED TO SURVEY UNIT (SYSTEMATIC AVG.) = -
DOSE ASSIGNED TO SURVEY UNIT (SYSTEMATIC AVG.) = - mrem/yr Page 31 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 2 FSS PRELIMINARY SURVEY DATA
SUMMARY
Page 3 of 3 JUDGMENTAL MEASUREMENTS FSS Unit Description Classification Type Structural Surface Surface Area m2 Description Measured Inferred Operational Location FOV Activity Activity DCGL Fraction of DCGLOPS Sample ID ID# ROC Ratio 2 2 2 2 DCGLOPS SOF (Grid No.) (m ) (pCi/m ) (pCi/m ) (pCi/m )
Cs-137 Co-60 Eu-152 Eu-154 Sr-90 Cs-137 Co-60 Eu-152 Eu-154 Sr-90 AVERAGE SOF (JUDGMENTAL) =
Max Judgmental SOF= Number of Judgmental Measurements with SOF >1 =
Number of Judgmental Measurements = # of Measurements with SOF >0.1 (HTD Assessment) =
Page 32 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 3 DOSE SIGNIFICANT RADIONUCLIDES AND MIXTURE1 Radionuclide Soil/Pipe Mix Fraction2 Rx Bldg. Mix Fraction WGTV Mix Fraction Co-60 7.14E-02 8.44E-02 1.03E-02 Cs-137 9.19E-01 9.08E-01 9.76E-01 Eu-152 6.09E-03 3.39E-03 9.75E-03 Eu-154 3.11E-03 4.60E-03 3.49E-03 1.) Based on maximum percent of total activity from Table 22 of La CrosseSolutions RS-TD-313196-001, Radionuclides of Concern for Soil and Basement Fill Model Source Terms (Reference 2.10), normalized to one for the dose significant radionuclides.
2.) The values for Soil/Pipe are intended to be applied to above grade buildings and other materials not associated with the Rx Bldg. or WGTV.
ATTACHMENT 4 FINAL SR-90 TO CS-137 SURROGATE RATIOS Building or Sr-90/Cs-137 Surrogate Activity Area Ratio WGTV 6.75E-02 Rx Bldg. 5.00E-01 Tunnel1 2.24E-02 WTB1 4.82E-01 Soils2 5.02E-01 1.) These buildings are not in the site end-state.
2.) The soil designation represents all concrete core bores and could also be used for other miscellaneous structures (e.g., above grade structures) to remain if needed.
Page 33 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 5 BASE CASE DCGLS FOR SOIL (DCGLS)
ROC Soil DCGL (pCi/g)
Co-60 1.06E+01 Sr-90 5.47E+03 Cs-137 4.83E+01 Eu-152 2.36E+01 Eu-154 2.19E+01 OPERATIONAL DCGLS FOR SOIL (OpDCGLS)
ROC Soil OpDCGLS (pCi/g)
Co-60 3.83 Sr-90 1970.45 Cs-137 17.39 Eu-152 8.51 Eu-154 7.89 Page 34 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 6 BASE CASE DCGLS FOR BURIED PIPE (DCGLBP)
Buried Pipe Buried Pipe ROC Group Circulating Water Discharge (dpm/100 cm2) (dpm/100 cm2)
Co-60 7.51E+04 7.75E+04 Sr-90 5.16E+05 7.56E+05 Cs-137 3.19E+05 3.30E+05 Eu-152 1.64E+05 1.67E+05 Eu-154 1.53E+05 1.56E+05 OPERATIONAL DCGLS FOR BURIED PIPE (OpDCGLBP)
Buried Pipe Buried Pipe Group Circulating Water Discharge ROC OpDCGLBP OpDCGLBP (dpm/100 cm2) (dpm/100 cm2)
Co-60 2.25E+04 2.33E+04 Sr-90 1.55E+05 2.27E+05 Cs-137 9.56E+04 9.91E+04 Eu-152 4.93E+04 5.02E+04 Eu-154 4.58E+04 4.67E+04 Page 35 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 7 BASE CASE DCGLS FOR BASEMENTS (DCGLB)
Rx Bldg DCGLB WGTV DCGLB ROC (pCi/m2) (pCi/m2)
Co-60 5.16E+06 4.10E+06 Sr-90 1.45E+07 6.40E+06 Cs-137 2.17E+07 1.76E+07 Eu-152 1.19E+07 9.69E+06 Eu-154 1.10E+07 8.97E+06 OPERATIONAL DCGLS FOR BASEMENTS (OpDCGLB)
Rx Bldg WGTV ROC OpDCGLB OpDCGLB (pCi/m2) (pCi/m2)
Co-60 3.61E+05 2.87E+05 Sr-90 1.02E+06 4.48E+05 Cs-137 1.52E+06 1.23E+06 Eu-152 8.33E+05 6.78E+05 Eu-154 7.71E+05 6.28E+05 Page 36 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 8 BASE CASE DCGLS FOR ABOVE GRADE BUILDINGS (DCGLAGB)
Above Grade Building ROC (dpm/100 cm2)
Co-60 7100 Sr-90 8700 Cs-137 28000 Eu-152 12700 Eu-154 11500 OPERATIONAL DCGLS FOR ABOVE GRADE BUILDINGS (OpDCGLAGB)
Above Grade Building ROC OpDCGLAGB (dpm/100 cm2)
Co-60 1136 Sr-90 1392 Cs-137 4480 Eu-152 2032 Eu-154 1840 Page 37 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 9 NUREG-1757, Volume 1, Rev. 2 Appendix H Page 38 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 10 FSS INVESTIGATION LEVELS FSS Investigation Levels Survey Unit Direct Measurement Scan Investigation Levels:
Classification Investigation Levels:
> DCGLw or >MDCscan if Class 1 > DCGLw MDCscan is greater than DCGLw
> DCGLW or > MDCscan if Class 2 > DCGLw MDCscan is greater than DCGLW
> DCGLW or > MDCscan if Class 3 > 0.5 DCGLw MDCscan is greater than DCGLW Page 39 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 11 SIGN STATISTICAL TEST Survey Area Description Survey Unit Description Classification Type I Error Number of Measurements SOF
- 1-Ws Sign (Ws) 1 2
3 4
5 6
7 8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 Number of positive differences (S+)
Critical Value Survey Unit the Acceptance Criteria Prepared by:
(Print Name) (Signature) (Date)
Peer Reviewed by:
(Print Name) (Signature) (Date)
Page 40 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 12 a priori DOSE FRACTIONS (f) a priori FSS Unit Source Term/Media for FSS Fraction, f Basement Floor and Walls 0.07 Groundwater Other Basement Floor and Walls 0.01 Soil Soil 0.36 Buried Pipe Buried Pipe 0.30 Groundwater Other Buried Buried Pipe 0.06 Pipe Above Grade Building Floor, Walls, Ceiling 0.16 Existing Groundwater Groundwater Monitoring 0.04 Results Sum 1.0 Page 41 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 13 FINAL STATUS SURVEY INVESTIGATION Page 1 of 8 Survey Area: No.
Description:
Classification:
Survey Unit: No.
Description:
Performed by: Date: Time:
- 1. Reason for Investigation FSS Sample(s) with Result(s) > Investigation Levels Scan Measurement(s) > Investigation Levels FSS Measurement(s) with Results(s) > Investigation Levels Failure of Statistical Test Other
- 2. Identified Elevated Sample(s)
Radionuclides-of-Concern Location Sample ID Cs-137 _________ _________ _________ _________ _________
Northing Easting ________ Fraction ________ Fraction ________ Fraction ________ Fraction ________ Fraction ________ Fraction Page 42 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 13 FINAL STATUS SURVEY INVESTIGATION Page 2 of 8
- 3. Bounding of Identified Elevated Area(s)
- a. Is the elevated area(s) adequately verified and bounded by the existing samples? Yes No
- 1) If Yes, then proceed to step 4
- 2) If No, then prepare an addendum to the FSS Survey Plan for this survey unit to take additional samples as necessary to adequately verify and bound the identified area(s) of suspected elevated activity.
- b. Bounding Sample(s)
Radionuclides-of-Concern Location Sample ID Cs-137 _________ _________ _________ _________ _________
Northing Easting ________ Fraction ________ Fraction ________ Fraction ________ Fraction ________ Fraction ________ Fraction Page 43 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 13 FINAL STATUS SURVEY INVESTIGATION Page 3 of 8
- 4. Elevated Measurement Comparison If the survey unit is a Basement FSS unit, Buried Pipe FSS unit or classified as an Open Land Class 2 or Class 3 FSS unit, then an Elevated Measurement/Sample is defined as residual radioactivity in concentrations greater than the Operational DCGLs (or 0.5 time the Operational DCGL in a Class 3 FSS unit). In a Class 1 Open Land FSS unit, the Elevated Measurement Comparison is applicable. In both scenarios, the Base Case DCGLs are used in this calculation.
- a. In each elevated area, denote the Base Case DCGL applicable to each ROC.
- b. Calculate an area in square meters for the identified elevated area(s).
- c. If the survey unit is a Class 1 Open Land FSS unit, then select the appropriate Area Factor (AF) from Attachment 13 that corresponds to the area and to the radionuclide with the elevated activity.
- d. For all other survey units, calculate an Area Adjustment Factor (AAF) by dividing the survey unit size in m2 by the area of the elevated area in m2 .
Elevated Area #1 Area Size: m2 Cs-137 _________ _________ _________ _________ _________
DCGL Ci/g Ci/g Ci/g Ci/g Ci/g Ci/g AF or AFF Elevated Area #2 Area Size: m2 Cs-137 _________ _________ _________ _________ _________
DCGL Ci/g Ci/g Ci/g Ci/g Ci/g Ci/g AF or AFF Elevated Area #3 Area Size: m2 Cs-137 _________ _________ _________ _________ _________
DCGL Ci/g Ci/g Ci/g Ci/g Ci/g Ci/g AF or AFF Page 44 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 13 FINAL STATUS SURVEY INVESTIGATION Page 4 of 8
- e. Calculate the adjusted DCGL (or DCGLEMC for Class 1soil) for each applicable radionuclide by multiplying the applicable DCGL for the elevated measurement(s) or sample(s) by the AF or AAF as appropriate.
Elevated Area #1 Cs-137 _________ _________ _________ _________ _________
DCGLADJ C Ci/g Ci/g Ci/g Ci/g Ci/g i/g Elevated Area #2 Cs-137 _________ _________ _________ _________ _________
DCGLADJ C Ci/g Ci/g Ci/g Ci/g Ci/g i/g Elevated Area #3 Cs-137 _________ _________ _________ _________ _________
DCGLADJ C Ci/g Ci/g Ci/g Ci/g Ci/g i/g
- f. Calculate the Average Radioactivity Fraction for the survey unit as follows:
Note: The Average Radioactivity Fraction is calculated using only sample results from the systematic sample population that are located outside of any identified elevated area.
Cs-137 _________ _________ _________ _________ _________
Avg. Concentration of Radionuclide (j) Ci/g Ci/g Ci/g Ci/g Ci/g Ci/g Base Case DCGL Ci/g Ci/g Ci/g Ci/g Ci/g Ci/g Average Fraction of DCGL (fj)
- 1) Sum the Fraction of DCGL (fj) values for each pertinent radionuclide to derive the Average Radioactivity Fraction (favg) =
Page 45 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 13 FINAL STATUS SURVEY INVESTIGATION Page 5 of 8
- g. Calculate an Elevated Radioactivity Fraction (fELEV) for each identified elevated area as follows;
- 1) Determine the average concentration (j) for each radionuclide in each identified elevated area.
- 2) Subtract the Average Concentration of Radionuclide (j) for each radionuclide from step 4f from the average radionuclide concentration (j) in the elevated area and divide this value by the DCGLADJ from step 4e to derive a Fraction of DCGLELEV (fROC) for each radionuclide.
- 3) Sum the Fraction of DCGLELEV (fROC) values for each pertinent radionuclide to derive the Elevated Radioactivity Fraction (fEMC) for the elevated area.
Elevated Area #1 Cs-137 _________ _________ _________ _________ _________
Avg. Concentration of Elevated Area (j) Ci/g Ci/g Ci/g Ci/g Ci/g Ci/g Avg. Concentration of Radionuclide (j) Ci/g Ci/g Ci/g Ci/g Ci/g Ci/g (j - j) = Ci/g Ci/g Ci/g Ci/g Ci/g Ci/g DCGLELEV Fraction of DCGLEMC (fROC)
Elevated Radioactivity Fraction (fELEV) for Elevated Area #1 Elevated Area #2 Cs-137 _________ _________ _________ _________ _________
Avg. Concentration of Elevated Area (j) Ci/g Ci/g Ci/g Ci/g Ci/g Ci/g Average Concentration of Survey Unit (j) Ci/g Ci/g Ci/g Ci/g Ci/g Ci/g (j - j) = Ci/g Ci/g Ci/g Ci/g Ci/g Ci/g DCGLELEV Fraction of DCGLEMC (fROC)
Elevated Radioactivity Fraction (fELEV) for Elevated Area #2 Page 46 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 13 FINAL STATUS SURVEY INVESTIGATION Page 6 of 8 Elevated Area #3 Cs-137 _________ _________ _________ _________ _________
Avg. Concentration of Elevated Area (j) Ci/g Ci/g Ci/g Ci/g Ci/g Ci/g Average Concentration of Survey Unit (j) Ci/g Ci/g Ci/g Ci/g Ci/g Ci/g (j - j) = Ci/g Ci/g Ci/g Ci/g Ci/g Ci/g DCGLELEV Fraction of DCGLEMC (fROC)
Elevated Radioactivity Fraction (fELEV) for Elevated Area #3
- h. Sum the Elevated Radioactivity Fractions (fELEV) for each elevated area.
- i. Add the Average Radioactivity Fraction (favg) from step 4f to the summed Elevated Radioactivity Fractions (fELEV). This value represents the SOF for this survey unit.
- j. If the SOF is less than or equal to unity (1), then the survey unit will pass. If the SOF is greater than unity (1), then the need for additional remediation is likely.
- 5. Investigation Conclusions
- a. All FSS Units
- 1) Did the survey unit fail the statistical test or, does the mean SOF (using Operational DCGLs) exceed unity or, does an individual FSS Investigation Levels (Attachment 7) or, the Total Mean Dose exceeds 25 mrem/yr. or, the sum of the Mean Yes No measurement/sample exceed the Base Case DCGL?
(If Yes, then initiate Attachment 14, Corrective Actions for Final Radiation Survey Failure. If No, then proceed to next step applicable to the classification of the survey unit complete and no further action is required.)
- b. FSS Class 3 Survey Unit
- 1) Is the concentration for any radionuclide reported in any systematic, biased or investigative sample taken in the survey unit equal to or greater than 50% of its respective DCGLw? Yes No Page 47 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 13 FINAL STATUS SURVEY INVESTIGATION Page 7 of 8 (If Yes, then initiate Attachment 15, Corrective Actions for Final Radiation Survey Failure. If No, then the investigation is complete and no further action is required.)
- c. FSS Land Class 2 Survey Unit
- 1) Is the concentration for any radionuclide reported in any systematic, biased or investigative sample taken in the survey unit equal to or greater than its respective Operational DCGL? Yes No (If Yes, then initiate Attachment 14, Corrective Actions for Final Radiation Survey Failure. If No, then the investigation is complete and no further action is required.)
- d. FSS Land Class 1 Survey Unit
- 1) Is the concentration for any radionuclide reported in any systematic, biased or investigative sample taken in the survey unit equal to or greater than its respective Operational DCGL? Yes No (If Yes, then proceed to next step. If No, then the investigation is complete and no further action is required.)
- 2) Does the summed Elevated Radioactivity Fractions (fELEV) from step 4h exceed unity (1)? Yes No (If Yes, then initiate Attachment 14, Corrective Actions for Final Radiation Survey Failure. If No, then the investigation is complete and no further action is required.)
- 6. Comments; Page 48 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 13 FINAL STATUS SURVEY INVESTIGATION Page 8 of 8
- 6. Comments (continued);
- 7. Approval Prepared by (FSS Supervisor):
(Print Name) (Signature) (Date)
Reviewed by RP/FSS Manager:
(Print Name) (Signature) (Date)
Page 49 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 14 AREA FACTORS FOR SOIL Area Factor (Unitless)
RROC 2 2 1m 2m 5 m2 10 m2 100 m2 Co-60 9.44 5.56 3.07 2.04 1.19 Cs-137 9.11 5.42 3.01 2.00 1.18 Sr-90 11.21 6.66 3.69 2.45 1.41 Eu-152 9.30 5.50 3.04 2.02 1.18 Eu-154 9.38 5.54 3.06 2.03 1.18 Page 50 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 15 CORRECTIVE ACTIONS FOR FINAL STATUS SURVEY FAILURE Survey Area: No.
Description:
Survey Unit: No.
Description:
Classification:
Performed by: Date: Time:
Resurvey, Reclassification or Remediation Based upon the failure of the statistical test or the results of an investigation, the following action(s) are required.
Note: Use the guidance provided in Attachment 9 for determination of appropriate action(s).
Resurvey Action(s) Required Reclassify Action(s) Required Remediate Action(s) Required Approval Prepared by (FSS Supervisor):
(Print Name) (Signature) (Date)
Approved by:
(RP/FSS Manager) (Signature) (Date)
Page 51 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 16 REMEDIATION, RECLASSIFICATION AND RESURVEY ACTIONS Page 1 of 2 REMEDIATION Remediation Criteria Proposed Remediation
- 1) The SOF (using Base Case DCGL or DCGLEMC for soils) for survey unit is less than or None equal to unity (1)
Class 1 FSS Survey 2) The Elevated Radioactivity Fraction (fELEV) exceeds unity in 5% or less of the survey unit Spot Remediation & Resurvey Unit area.
- 3) The Elevated Radioactivity Fraction (fELEV) exceeds unity in greater than 5% of the survey General Remediation and Restart FSS unit area.
- 1) The mean inventory fraction (total mean dose for the survey unit divided by the dose Class 1 Basement criterion of 25 mrem/yr) is greater than or equal to one.
FSS Unit General Remediation and Restart FSS
- 2) The sum of the mean inventory fractions for each FSS unit contained within a building basement is greater than or equal to one.
RECLASSIFICATION Reclassification Criteria Proposed Action The extent of the elevated area relative to the total Reclassify only the bounded discrete area of area of the survey unit is minimal and the source of elevated activity to Class 1.
the residual radioactivity is known One or several survey measurements (scan, Class 2 Survey Unit sample or direct measurement) exceed the The extent of the elevated area relative to the total Reclassify 2,000 m2 for soils or 100 m2 for Operational DCGL or a portion of the area of the survey unit is minimal and the source of structures around the area of elevated activity as survey unit is remediated. the residual radioactivity is unknown Class 1.
The extent of the elevated area relative to the total Reclassify the entire survey unit as Class 1.
area of the survey unit is significant.
Reclassify the area of elevated activity to Class 1 and create a Class 2 buffer zone of appropriate size around the area.
The extent of the elevated area relative to the total Reclassify the area of elevated activity to Class 1 One or several survey measurements (scan, area of the survey unit is minimal sample or direct measurement) exceed 50% and create a Class 2 buffer zone of appropriate size Class 3 Survey Unit of the Operational DCGL or a portion of the around the area or survey unit is remediated.
Reclassify the area of elevated activity to Class 2.
For soils, reclassify 10,000 m2 around the area of The extent of the elevated area relative to the total elevated activity to2 Class 2. For structures, area of the survey unit is significant. reclassify 1,000 m around the area of elevated activity to Class 2.
Page 52 of 53
LC-FS-PR-008 Final Status Survey Data Assessment Revision1 ATTACHMENT 16 REMEDIATION, RECLASSIFICATION AND RESURVEY ACTIONS Page 2 of 2 RESURVEY Resurvey Criteria Proposed Action The extent of the elevated area relative to the Re-scan remediated area; collect replacement total area of the survey unit is minimal ( 5% systematic population samples/measurements of the total survey unit surface area). within the remediated area using random The survey unit has been remediated. selection.
Class 1 Survey Unit The extent of the elevated area relative to the Resurvey entire survey unit using a new total area of the survey unit is significant (> 5% systematic survey design.
of the total survey unit surface area).
Survey unit has been reclassified from a No remediation was performed. Increase scan or areal coverage to 100%.
Class 2 survey unit. Additional statistical samples are not required.
The area of the new Class 1 survey unit relative to the area of the initial Class 2 survey unit is Increase scan or areal coverage in Class 2 Survey unit has been divided to minimal and no statistical samples were survey unit.
Class 2 Survey Unit accommodate a new Class 1 survey affected.
unit. Increase scan or areal coverage in Class 2 Statistical sample population was affected by survey unit and resurvey entire survey unit the reclassification. using a new survey design.
The area of the new Class 2 survey unit relative Increase scan or areal coverage in Class 3 to the area of the initial Class 3 survey unit is survey unit, collect replacement systematic Survey unit has been divided to minimal. population samples/measurements within the Class 3 Survey Unit accommodate a new Class 2 survey remediated area using random selection.
unit. The area of the new Class 2 survey unit relative to the area of the initial Class 3 survey unit is Resurvey entire survey unit using a new significant. survey design.
Page 53 of 53