ML052140403

Rev. 1 to Calculation E900-05-015, OL1 Paved & Miscellaneous Concrete Surfaces MA8, PF1, DB5, DB1, SS12, SS24-Survey Design, Appendices B - D to Final Status Survey Report for Saxton Nuclear Experimental Corp Residual Concrete in OL1.

ML052140403
Person / Time
Site:	Saxton File:GPU Nuclear icon.png
Issue date:	05/19/2005
From:	Cooper W FirstEnergy Corp
To:	Office of Nuclear Reactor Regulation
References
E900-05-015, Rev. 1
Download: ML052140403 (92)

Text

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Appendix B Surfaces Survey Design Revision 1

ORIGINAL SNEC CALCULATION COVER SHEET CALCULATION DESCRIPTION ______

Calculation Number Revision Number Effective Date Page Number E900-05-015 1 1 I/ of 13 Subject OL1 Paved and Miscellaneous concrete surfaces MA8, PFI, DB5, DBI, SS12, SS24 - Survey Design Question I - Is this calculation defined as 'in QA Scope? Refer to definition 3.5. Yes Li No El Question 2 - Is this calculation defined as a Tesign Calculationf? Refer to definitions 3.2 and 3.3. Yes (D No El NOTES: If a 'Yes answer Is obtained for Question 1.the calculation must meet the requirements of the SNEC Facility Decommissioning Quality Assurance Plan. If a 'Yes' answer Is obtained for Question 2, the Calculation Originator's Immediate supervisor should not review the calculation as the Technical Reviewer.

DESCRIPTION OF REVISION 1 - Revision 1 adds the use of the 43-37 extra large probe to the design. Numerous additions are made to provide setpoints, mdcr, useage protocols, etc. and attachments. The complete text of pages 1 through 13 is provided here, but only the added attachments are included. This revision also adds the survey units and layout for the concrete in the SSGS area OL1 -8.

APPROVAL SIGNATURES I

I.

Technical Reviewer Additional Review Additional Review

X= P . SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 - I Page 2 of 13 Subject OL1 Paved and Misc. concrete surfaces MA8, PFI, DB5, DBI, SS12, SS24 - Survey Design 1.0 PURPOSE 1.1 The purpose of this calculation is to develop a survey design for the residual concrete surfaces in the Saxton Nuclear Experimental Corporation SNEC and SSGS site areas. The total area (011) including the soil and solid surface portions is approximately 11600 square meters. Portions of the solid surface (concrete, macadam, brick) are Classl, Class 2, and Class 3 survey areas. Because the survey area exceeds the size limitations in the SNEC LTP (Reference 3.5) Table 5-5 for maximum Class I survey unit area and it includes survey units of all three classifications, this survey area is subdivided into multiple survey units: 011-7 is an existing excavation in the SNEC site area, that will be backfilled after survey. 011-8 through OL1-13 are subdivisions of the large open land area and comprise the majority of the total surface area. These open land areas and the excavation are covered by other design calculations. Several additional areas comprise the residual exposed concrete and macadam surfaces:

1.1.1 PFI is a pre-existing Class 1 survey unit for the Personnel Access Facility (PAF) floor and includes the north edge of the PF1 portion of the slab with approximately 37 m2 1.1.2 DB1 is a pre-existing Class 1 survey area for the Decommissioning Support Building (DSB) floor pad and door ramp. This area is further divided into two survey units due to LTP survey unit area limitations. DB1-1(85 M2 ) and DBI-2 (109 i 2) with 194 m2 total. DBI-1 includes the full width of the north edge of the DSB portion of the pad.

1.1.3 DB5 is a pre-existing Class 1 survey unit for the DSB carport floor of approximately 54 m2 1.1.4 SS12 is a pre-existing survey area for the SSGS boiler pad. This concrete, although it is in a Class I soil area, is classified as Class 3 in the LTP Table 5-2. Some minor details of residual concrete hidden by soil may be present. This will not affect the survey since it is class 3 and only 10% scan is needed. Since SS12 is Class3, the entire pad is a single survey unit of approximately 658 M 2 .

1.1.5 SS24-1 is a Class 3 survey unit defined for the miscellaneous SSGS pads north of the turbine hall. There is likely to be a buried portion of this slab west of this area which is separately defined as SS24-2. Since SS24 is Class 3, the entire exposed pad is a single survey unit. Design scan area is 105 n2. The west edge of the exposed concrete is uneven and the area is approximately 249 M2 .

1.1.6 SS24-2 is a Class 3 survey unit defined for the miscellaneous SSGS pads north of the turbine hall. This is a buried portion of this slab west of the area defined as SS24-1. This area must first be surveyed as open land per E900-05-014, then cleared of soil and the residual concrete surveyed per this design. Since SS24 is Class 3, the entire buried portion of the pad is a single survey unit. Design scan area is 118 m2. The area is approximately 321 M 2 .

1.1.7 MA8-6 through 13, 16, and 17: Ten survey units of the old parking lot and driveway macadam. Because of the 100 M2 survey unit limitation for Class 1 surfaces, the surface was subdivided into ten approximately 100 m2 (or less) survey units. The pavement occupies all of, or a large portion of, grids AT131, AU127, AU128, AU129, AU130, AU131, AV130, AV131, AW131, AX131, AY131. These are all class 1 survey units due to verbal reports of minor remediation and due to their proximity to

?-v SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 - - I I Page 3 of 13 Subject OL1 Paved and Misc. concrete surfaces MA8, PF1, DB5, DBI, SS12, SS24 - Survey Design the C&A building, the barrel bunker, and containment. Total area is about 772 m2 .

General arrangement of these units is shown in the drawing Attachment 6-17.

1.1.8 MA8-16 and MA8-17 have about 4 to 6 inches of soil on top of the pavement. This soil is to be surveyed per E900-05-014 and then removed and placed in a PRI pile to allow the pavement survey per this design.

1.1.9 MA8 the Line Shack concrete including garage door ramps and sidewalks. This area is not specifically classified in the SNEC LTP (Reference 3.5) but is selected to be class 2 consistent with the class 3 classification of the line shack exterior and the class 1 assigned to the surrounding soil. This is a Class 2 survey unit with about 33 m2 total area.

1.1.10 MA8-15 is additional concrete surfaces around the CV. There is some SSGS concrete and additional small monoliths in OL1-9 NW of the CV. This small concrete area is not specifically addressed in the SNEC LTP but is assumed to be Class 1 due to proximity to the CV and is about 37 M2 .

1.1.11 A summary list of survey unit areas is included as Attachment 5-1.

1.2 This survey design applies only to the residual concrete, macadam, and other paved surfaces in the survey area. The design for the open land areas, fences, the east yard excavation, and the portion of OL1 covering the SSGS will be provided in separate calculations. The general layout of this survey unit is shown on Attachment 1-1.

1.3 If additional areas of concrete not identified here are found under soil, this design may to be revised to include the additional area.

2.0

SUMMARY

OF RESULTS The following information should be used to develop a survey request for this survey unit. The effective DCGLw value is listed below. This value is derived from previously approved derived values for CV Yard Soil and Boulders", Attachment 2 in SNEC calculation E900-04-005 (Reference 3.15). The US NRC has reviewed and concurred with the methodology used to derive these values.

See Attachment 2-1 and Reference 3.9.

Table 1, DCGLw Values I Gross Activity DCGLw (dpml100 cm,)

26445 (19834 A.L.)

NOTE: A.L Is the site Administrative Umit (75% of effective DCGLw) 2.1 Survey Design 2.1.1 Scanning of concrete and macadam surfaces shall be performed using a L2350 with 43-68B gas flow proportional counter or a 43-37 'extra large' probe calibrated to Cs-137 (see typical calibration information on Attachments 3-1 and 3-2). Generic approval for use of the 43-37 is included in Reference 3.10.

2.1.2 The instrument conversion factor/efficiency (Et) shall not be less than that assumed on Attachment 4-1 as 23.9% - Cs-137 for the 43-68B nor less than 20. 0 /%-Cs137 for the 43-37 in its lowest efficiency region as assumed on Attachment 4-3.

I . SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 - -- I Page4of 13 Subject OL1 Paved and Misc. concrete surfaces MA8, PFI, DB5, DBI, SS12, SS24 - Survey Design 2.1.3 Other instruments of the types specified in Section 2.1.1 above may be used during the final status survey (FSS), but must demonstrate detection efficiencies at or above the values listed in Section 2.1.2 above.

2.1.4 An efficiency correction factor (ECF) is applied to compensate for efficiency loss when surveying rough surfaces based on Reference 3.1 and Attachment 2-2.

2.1.5 The fraction of detectable beta emitting activity affects the efficiency and is determined by the nuclide mix. The mix detectable beta fraction is determined to be 60% based on Reference 3.15. Because the adjusted DCGLw used is based only on the modified Cs-137 DCGLw, the mix percentage is not applied to the adjusted surrogate DCGLw. The gross activity DCGLw, which would include all the low energy activity and would require mix percentage adjustment is considerable higher, at 44434 dpm 100cm 2 . The Cs-137 adjusted surrogate activity already accounts for the detectable beta yield of the mix.

2.1.6 The ECF is derived from Attachment 2-2 and Reference 3.1 based on a surface irregularity of 3 inches or less FOR THE 43-68B DETECTOR. This is conservative, as actual observed irregularity is typically less than one inch. Also, the loss of efficiency is based on moving the detector away from a 150 cm2 source. If the area of the residual activity is larger, than the efficiency loss would be smaller due to the increase in 'field-of-view' of the detector.

2.1.7 The ECFs developed for the 43-68B probe per reference 3.1 are assumed to apply to the 43-37. The ECF for the 43-37 are based on the ASSUMPTION that the detector face will not be more than about 1 inch farther from the surface than from the source in the test jig (0.5 inches apart) and that the surface will be fairly smooth, typical of poured concrete or macadam.

2.1.8 Because the alarm point and MDCscan are based on the highly conservative surface irregularity assumptions (intended to bound all cases to simplify design and performance of the survey), where surfaces are much smoother (e.g. 1 inch irregularity or less per probe area for the 43-68B) than the assumed 3 inch variability, short (e.g. 1/2 to 1 inch) standoff support pegs may be attached to the 43-68B in order to reduce the possibility of mylar damage. These standoffs must only be used when the surface smoothness is well within the assumed 3 inch variability.

Because the high surface irregularity is assumed and used for the efficiency of the instrument for the entire design, this standoff will not affect the assumed efficiency if limited as discussed above.

Table 2, GFPC Detection Efficiency Results Used for Planning Detector Material Type El Es Et(as %) ECF Adjusted efficiency 43-68B Concrete or asphalt .478 .5 23.9 .2 4.8%

43-37 Concrete or asphalt .4 .5 20.0 .5 10.0%

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 1 Page 5 of 13 Subject OL1 Paved and Misc. concrete surfaces MA8, PFI, DB5, DB1, SS12, SS24 - Survey Design Table 3, Surface Scanning Parameters for Solid Misc. Concrete & Pavement Sections Detector MDCscan Scan Speed Maximum Distance from Surface DCGLw Action  %

(dprnl 00cm2)* (cm/sec) Level Coverage 43-68B 4634 10 3' (gap between detector face & > 14503 cpm Up to I surface or 3 inch irregularity) 100%

43-37 7311 30.5 1.5' (gap between detector face & >2900 cpm U0to surface)10 See Attachment 2-1, 2-2,4-1, and 4-3 for calculations*

2.1.9 The 43-68B MDCscan (shown in Attachment 4-1) is based on a 300 cpm background. Typical backgrounds are similar to this value assumed, as shown in the variability data shown as 'CW" (closed window or shielded detector) in Attachment 8-2. Unaffected material backgrounds were determined at the Williamsburg station, which resulted in a mean background value of 306 cpm +/- 34.5. On 3/7105, measurements were collected on three different surfaces in OL1: the DSB pad, the old parking lot, and the SSGS boiler pad.

2.1.10 The 43-37 MDCscan (shown in Attachment 4-2) is based on a 1020 cpm background. On 5/12/05, measurements were collected on three different surfaces in OL1: the DSB pad, the asphalt, and the SSGS boiler pad. These are shown in Attachment 8-7 and Attachment 8-8.

2.1.11 The 43-37 detector is to be used as a screening process.

2.1.11.1 Since the efficiency is determined with the same source as used for the 43-68B, the effective area of the detector is assumed to be 100 cm2 for determining the MDCscan. This will underestimate the response of the detector to larger sources but produce similar efficiencies and MDCs as for the 43-68B.

2.1.11.2 Scanning using the 43-37 will be done only on flat surfaces with surface irregularities typical of poured concrete or rolled macadam pavement. Uneven surfaces, edges, etc. will be scanned with the 43-68B.

2.1.11.3 Because the 43-37 has a much larger effective surface area than the 43-68B, and the MDC and action level are based only on a 100 cm2 elevated spot, the 43-37 may provide action level count rates on larger diffuse source areas that actually are less than the DCGL. Therefore, the 43-37 will be used to screen surfaces and will be considered to be the 'official' results only if no action levels are observed.

2.1.11.4 Any action levels observed with the 43-37 will be rescanned with the 43-68B. If no AP is observed with the 43-68B, there is no AP. APs observed in follow-up rescans with the 43-68B will be handled and documented in the SR per section 2.1.16 below.

2.1.11.5 Fraction scanned with the 43-37 and results should be separately reported in the SR for each survey unit / grid/ etc. in a similar manner as used for the

SNEC CALCULATION SHEET Calcuation Number Revision Number Page Number E900-05-015 - Page 6 of 13 Subled OL1 Paved and Misc. concrete surfaces MA8, PF1, DB5, DB1, SS12, SS24 - Survey Design 43-68B. E.G. '90% scanned with 43-37, one alarm rescanned with 43-68B-no-43-68B AP'.

2.1.12 The 3/7/05 survey data shown as 'OWW (open window or unshielded) is used for the variability assessment for the COMPASS determination of sample requirements and is shown in Attachment 8-2.

2.1.13 A background of 1300 cpm for the 43-68B would still result in MDCscan less than about 50% of the DCGLw (Attachment 4-2). Since the Action level cited in Table 3, above, is total counts per minute including background, if local backgrounds significantly exceed the background count rate assumed for the MDCscan (about 300cpm for the 43-68B see - Attachment 4-1 or 1020 cpm for the 43 see Attachment 4-3) contact the cognizant SR coordinator to determine need for additional background count rate adjustments.

2.1.14 The scan DCGLw Action Level for the 43-68B listed in Table 3 includes 1200 cpm DCGL equivalent count rate from Attachment 4-1 and an estimated 260 cpm background . The DCGLw action level is based on fixed measurement and does not include 'human performance factors' or 'index of sensitivity' factors (see Reference 3.12).

2.1.15 The scan DCGLw Action Level for the 43-37 listed in Table 3 includes 1950 cpm DCGL equivalent count rate from Attachment 4-3 and an estimated 950 cpm background. Although the 43-37 is assumed to be geometrically and functionally equivalent to the 43-68B for MDC and action level determination (a conservative assumption), the ECFs and probe areas are different and therefore result in a higher net count rate for the action level for the 43-37. The DCGLw action level is based on fixed measurement and does not include 'human performance factors' or 'index of sensitivity' factors (see Reference 3.12).

2.1.16 If a total count rate greater than the "DCGLw action level" of Table 3 is encountered during the scanning process with a 43-68B, the surveyor should stop and locate the boundary of the elevated area, and then perform a "second phase" fixed point count of at least 30 seconds duration. If the second phase result equals or exceeds the

'DCGLw action" level noted in table 3, the surveyor should then mark the elevated area with appropriate marking methods and document the count rate observed and an estimate of the affected area. Subsequent investigation may take the actual surface irregularity into account for the efficiency.

2.1.16.1 Class I concrete should be scanned to include 100% surface coverage at a scan rate of about 10 cm per second for the 43-68B or 30.5 cm per second for the 43-37. All accessible surfaces are required to be scanned. Areas that cannot be accessed should be clearly noted along with the reason for not completing the scan in that area.

2.1.16.2 Class 2 concrete would normally be scanned to include 10% to 100%

surface coverage. Only the concrete around the line shack is class 2. Due to the small size of the unit and the distribution of small areas, the unit (MA8-14) will be 100% scanned at a scan rate of about 10 cm per second for the 43-68B or 30.5 cm per second for the 43-37. Areas that cannot be accessed

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 1 Page 7 of 13 Subject OL1 Paved and Misc. concrete surfaces MA8, PFI, DB5, DBI, SS12, SS24 - Survey Design should be clearly noted along with the reason for not completing the scan in that area.

2.1.16.3 Class 3 concrete would normally be scanned to include up to 10% surface coverage. The concrete and pavement in and around the SSGS is class 3 and will be approximately 10% scanned at a scan rate of about 10 cm per second for the 43-68B or 30.5 cm per second for the 43-37. Three 25 square meter scan areas are shown on Attachment 6-34 for SS12, two regions totaling 105 square meters are shown on Attachment 6-36 for SS24-1, and two regions totaling 118 square meters are shown on Attachment 6-38 for SS24-2. Areas that cannot be accessed should be clearly noted along with the reason for not completing the scan in that area.

2.1.16.4 See Attachment 1-1 for grid layout for the survey units.

2.1.16.5 The surfaces of the concrete or other pavement materials should be clear of debris to ensure detection parameters are not affected.

2.1.17 The minimum number of fixed measurement sampling points indicated by the COMPASS computer program (Reference 3.3) is 11 for each survey unit (see COMPASS output on Attachment 7-1 to 7-5). Fixed point measurements should be done only with the 43-688 lAW Section 2.2. The MDCscan (concrete) is below the effective administrative DCGLwc,-137 (4634 DPMI100cm 2 MDCscan @300cpm bkg <

19834 DPMWIOOcm 2 AL for the 43-68B and 7311 DPM1 OOcm 2 MDCscan

@1020cpm bkg < 19834 DPM/ OOcm 2 AL for the 43-37).

2.1.18 The minimum number of fixed point samples is increased to 13 (18% increase) for survey unit DB1-2 due to the slightly oversized (109 M2 , 9% over LTP guideline) area of the unit. This oversize is due to the selection of a grid line as the separation point between DB1-1 and DB1-2. Survey Unit DB1-1 is only 85 M2 . Since both units are class 1, the DSB pad will be 100% scanned regardless of the survey unit separation. Relocation of the arbitrary separation line could make these both equal and <1OOm 2 but is not considered to be useful since: separation on a grid line simplifies survey layout, the two units combined are <200 M2 , and the two units combined have more than the required number of fixed points (26 total vs. 22 required per MARSSIM).

2.1.19 One Biased direct measurement point is placed in DB1-1 on the face of the exposed slab. This point should be taken centered vertically on the vertical face at the 128 grid line.

2.1.20 The minimum number of sample points for SS24-2 is increased to 18 to account for the unknown extent of the concrete below the soil layer to provide sufficient samples if some areas are not concrete.

2.1.21 VSP (Reference 3.4) is used to plot all sampling points on the included diagrams.

The actual number of random start systematically spaced measurement points may be greater than that required by the COMPASS computer code because of any or all of the following:

S.,v ,SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 I I Page 8 of 13 Subject OLI Paved and Misc. concrete surfaces MA8, PF1, DB5, DBI, SS12, SS24 - Survey Design placement of the initial random starting point (edge-effects),

odd shaped diagrams, and/or

• coverage concerns (see Attachment 6-1 to 6-39 for VSP sampling point locations) 2.1.22 Because this design is a conglomerate of multiple slab surfaces into multiple survey units, the sample point locations are not derived from a single starting point.

Measurement location details for the sample points are provided in the diagrams in Attachment 6.

2.1.23 Some sampling points may need to be adjusted to accommodate obstructions within the survey area. Contact the SR coordinator to report any difficulties encountered when laying out systematic grid sampling points.

2.1.24 Because of the unusual arrangement of this survey area, with multiple disjointed slabs that do not correspond directly to single grids, the drawings in Attachment 6 are intended to be as close as practicable to as-left conditions. However, if actual layout is different from that shown, review with the cognizant SR coordinator, finish the survey if practicable, and mark up the drawings to indicate actual layout.

2.1.25 When an obstruction is encountered that will not allow collection of a sample, contact the cognizantSR coordinatorfor permission to delete the sampling point.

NOTE If remediation actions are taken as a result of this survey, this survey design must be revised or re-written entirely.

2.2 Measure concrete fixed point and elevated areas(s) IAW SNEC procedure E900-IMP-4520.04 sec 4.3.3 (Reference 3.2) and the following.

2.2.1 Use only the 43-68B to confirm and 'finalize' elevated area measurements or to collect fixed point measurements.

2.2.2 Clearly mark, identify and document all sample locations.

2.3.1 Second phase scan any location that is above the action level cited in Table 3.

2.3.2 Investigation of APs may require surface and sub-surface samples per the LTP section 5.5.3.4.5 (Reference 3.5).

3.0 REFERENCES

3.1 SNEC Calculation number 6900-02-028, "GFPC Instrument Efficiency Loss Study" 3.2 SNEC Procedure E900-IMP-4520.04, 'Survey Methodology to Support SNEC License Termination".

3.3 COMPASS Computer Program, Version 1.0.0, Oak Ridge Institute for Science and Education.

3.4 Visual Sample Plan, Version 3.0, Copyright 2004, Battelle Memorial Institute.

3.5 SNEC Facility License Termination Plan.

°- SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 I Page 9 of 13 Subjed OLI Paved and Misc. concrete surfaces MA8, PF1, DB5, DBI, SS12, SS24 - Survey Design 3.6 SNEC Procedure E900-IMP-4500.59, gFinal Site Survey.Planning-and DQA".

3.7 SNEC survey 43-68B GFPC measurements in OLI dated 3/7/05 3.8 GPU Nuclear, SNEC Facility, "Site Area Grid Map", SNECRM-020, Sheet 1, Rev 4,1118/05.

3.9 SNEC Calculation No. E900-03-012, Effective DCGL Worksheet Verification.

3.10 SNEC calculation E900-05-031 "Use of the 43-37 Detector and Ludlum 239 Floor Monitor for FSS Surveys' 3.11 SNEC Procedure E900-IMP-4520.06, "Survey Unit Inspection in Support of FSS Design".

3.12 NUREG-1575, "Multi-Agency Radiation Survey and Site Investigation Manual", August, 2000.

3.13 Microsoft Excel 97, Microsoft Corporation Inc., SR-1 and SR-2, 1985-1997.

3.14 Left intentionally blank 3.15 SNEC Calculation E900-04-005 UCV Yard Survey Design - North West Side of CV" 3.16 SNEC survey 43-37 GFPC measurements in OL1 dated 5/12/05 4.0 ASSUMPTIONS AND BASIC DATA 4.1 The COMPASS computer program is used to calculate the required number of random start systematic samples to be taken in the survey unit (Reference 3.3).

4.2 Reference background data from offsite at the Williamsburg station were used as the initial estimate of variability. These results are shown on Attachment 8-1 and in Reference 3.15.

Additional variance data that is used to assess sampling requirements is derived from the survey, Reference 3.7. Background data for the 43-37 is not used for variability assessment, since the fixed point data is only collected with the 43-68B 4.3 The MARSSIM Sign Test (Reference 3.12) will be applicable for this survey design. No background subtraction will be performed under this criteria during the DQA phase.

4.4 The required points chosen by COMPASS are located on the survey map for the survey unit by the Visual Sample Plan (VSP) computer code (Reference 3.4).

4.5 Reference 3.5 and 3.6 were used as guidance during the survey design development phase.

4.6 Background for the 43-68B detector has been measured in the area, and ranges from about 250 to 300 cpm with averages of slightly less than 300 cpm (Reference 3.7). These recent survey result averages are used as the basis for the MDCscan. Background for the 43-37 detector has been measured in the area, and ranges from about 875 to 1100 cpm with averages of about 950 cpm to 1020 cpm (Reference 3.16 and Attachment 8-7). These recent survey result averages are used as the basis for the MDCscan.

4.7 The determination of the physical extent of this area is based on the drawing Reference 3.8 and a thorough walkdown / measurement of the survey unit.

4.8 Remediation History:

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 I Page 10 of 13 Subject OL1 Paved and Misc. concrete surfaces MA8, PF1, DB5, DB1, SS12, SS24 - Survey Design 4.8.1 OL1 is an open land area. Portionscontained-the original SNEC site facilityand the Saxton Steam Generating Station. Extensive remediation has occurred in the survey area.

The SNEC Radwaste building (RWDF), Control and Auxiliary (C&A) building, Containment Vessel (CV), the SSGS, various buried pipe tunnels and underground tanks were all removed to grade or below. The residual portions of the buildings have been previously surveyed and the release surveys have been accepted.

4.8.2 The SSGS was backfilled when it was permanently shut down. Subsequently, residual licensed activity was found using core bores. The SSGS backfill was removed and surveyed through an automated conveyor system. Additional concrete surfaces in the SSGS basement were remediated and then the scanned backfill was replaced following survey.

4.8.3 The underground tank excavation was backfilled after the tanks were removed early in the project. This backfill was removed and scanned using a automated conveyor scanning system and is currently stored for re-use.

4.8.4 The barrel bunker was removed as part of the remediation process.

4.8.5 Underground drainage, sewerage systems and surface soils have been removed.

4.8.6 Some pavement was remediated during the building removal phase.

4.9 This survey design uses Cs-137 as a surrogate for all SNEC facility related radionuclides in the survey unit. The effective DCGLw is the Cs-137 DCGLw from the SNEC LTP (28000 dpmr/10OcM 2 ) adjusted (lowered) to compensate for the presence (or potential presence) of other SNEC related radionuclides (Reference 3.9). In addition, an administrative limit (75%) has been set that further lowers the permissible Cs-137 concentration to an effective surrogate DCGLw for this survey area.

The sample database used to determine the effective radionuclide mix for the OL1 area has been drawn from samples that were assayed at off-site laboratories. This nuclide mix is copied from Reference 3.15.

The GFPC detector scan MDC calculation is determined based on a 10 cm/sec scan rate, a 1.38 index of sensitivity (95% correct detection probability and 60% false positive) and a detector sensitivity (Et) of 23.9% cpmldpm for Cs-137 for the 43-68B and 20% for the 43-

37. The expected range of background values varies from about 250 cpm to about 300 cpm for the 43-68B detector and about 875 cpm to about 1100 for the 43-37.

4.10 The survey unit described in this survey design was inspected after remediation efforts were shown effective. A copy of the specific portion of the SNEC facility post-remediation inspection report (Reference 3.11) applicable to this design is included as Attachment 9-1.

4.11 No special area characteristics including any additional residual radioactivity (not previously noted during characterization) have been identified in this survey area.

4.12 The decision error for this survey design is 0.05 for the a value and 0.1 for the 1 value.

4.13"Special measurements" (as described in the SNEC LTP, Reference 3.5) are included in this survey design. Section 5.5.3.4.5 discusses pavement surveys. This survey design is consistent with the LTP. Use of the 43-37 detector as a screening device may be considered a 'special measurement'. Use is explained and authorized in a SNEC calculation (Reference 3.10).

- t SNEC CALCULATION SHEET Calculaflon Number Revision Number Page Number E900-05-015 I Page 11 of 13 Subjed OLI Paved and Misc. concrete surfaces MA8, PF1, DB5, DB1, SS12, SS24 - Survey Design 4.14 No additional sampling will be performed lAW this survey design beyond that described herein.

4.15 SNEC site radionuclides and their individual DCGLw values are listed on Exhibit 1 of this calculation based on Table 5-1 in Reference 3.5.

4.16 The survey design checklist is listed in Exhibit 2.

4.17 Area factors are shown as part of COMPASS output (see Attachment 7-1) and are based on the Cs-137 area factors from the SNEC LTP.

5.0 CALCULATIONS 5.1 All calculations are performed internal to applicable computer codes or within an Excel (Reference 3.13) spreadsheet.

6.0 APPENDICES 6.1 Attachment 1-1 is the general layout diagram of the survey units.

6.2 Attachment 2-1 and 2-2 are the DCGLw calculation logic for the survey unit from Reference 3.15 and the estimate of effect on efficiency of the irregular surface.

6.3 Attachment 3-1, is a copy of the calibration data from typical 43-68B GFPC radiation detection instrumentation that will be used in this survey area. Attachment 3-2, is a copy of the calibration data for a typical 43-37 GFPC radiation detection instrumentation that will be used in this survey area.

6.4 Attachment 4-1, is the 43-68B MDCscan calculation sheet for concrete (and macadam) surfaces in dpm/1 00cm2 . Attachment 4-2 shows the effect of elevated background on the 43-68B MDCscan. Attachment 4-3 is the 43-37 MDCscan calculation sheet for concrete (and macadam) surfaces in dpm/1 00cm 2.

6.5 Attachment 5-1, is a summary list of survey units included in this design, with the estimated area of each.

6.6 Attachment 6-1 through 6-39, show the randomly picked scan locations (from VSP) and reference coordinates for the survey unit areas.

6.7 Attachment 7-1 through 7-5, are COMPASS output for the survey unit showing the number of sampling points in the survey unit, area factors, and prospective power.

6.8 Attachment 8-1, is the surface variability results for concrete surface measurements from the Williamsburg station (Reference 3.15). Attachment 8-2 is the summary of 43-68B backgrounds and surface measurements taken in the survey unit. Attachments 8-3 through 8-6 are copies of the survey used for variability. Attachment 8-7 is the summary of 43-37 backgrounds and surface measurements taken in the survey unit which are shown in Attachment 8-8.

6.9 Attachment 9-1, is the results of the inspection report for the residual surface portion of the OLI area. Attachments 9-2 through 9-5 are the surface test measurement data.

}-o G SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 I I Page 12 of 13 Subject OL1 Paved and Misc. concrete surfaces MA8, PF1, DB5, DBI, SS12, SS24 - Survey Design Exhibit I SNEC Facility Individual Radionuclide DCGL Values (a) 25 mremly Limit 4 mremly Goal 25 mremly Limit (All Pathways) (Drinking Water)

Radionuclide Surface Area Open Land Areas Open Land Areas (b)

(dpm/100cm 2 ) (Surface & Subsurface) (Surface & Subsurface)

(pCIg) (pCUg)

Am-241 2.7E+01 9.9 2.3 C-14 3.7E+06 2 5.4 Co-60 7.1 E+03 3.5 67 Cs-137 2.8E+04 6.6 397 Eu-152 1.3E+04 10.1 1440 H-3 1.2E+08 132 31.1 Ni-63 1.8E+06 747 1.9E+04 Pu-238 3.OE+01 1.8 0.41 Pu-239 2.8E+01 1.6 0.37 Pu-241 8.8E+02 86 19.8 Sr-90 8.7E+03 1.2 0.61 NOTES:

(a)While drinking water DCGLs will be used by SNEC to meet the drinking water 4 mrem/y goal, only the DCGL values that constitute the 25 mrem/y regulatory limit will be controlled under this LTP and the NRCs approving license amendment (b) Usted values are from the subsurface model. These values are the most conservative values between the two models (i.e.,

surface & subsurface).

?-- SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 1 Page 13 of 13 Subject OL1 Paved and Misc. concrete surfaces MA8, PFI, DB5, DBI, SS12, SS24 - Survey Design Exhibit 2 Survey Desion Checklist Calculation No. Location Codes SNEC plant areas: OL Paved and Miscellaneous

_____io N.E900-05-015 rev I concrete surfaces MA8, PFI, DB5, D81, SS12, SS24 Status Reviewer ITEM REVIEW FOCUS (Circle One) Initials &Date I Has a survey design calculation number been assigned and is a survey design summary Yes N/A description provided? Ys /

2 Are drawings/diagrams adequate for the subject area (drawings should have compass Yes, N/A 2 ~~~headings)? Ys I 3 Are boundaries properly Identified and is the survey area classification dearly indicated? Yes, N/A 4 Has the survey area(s) been properly divided into survey units lAW EXHIBIT 10 Yes, N/A 5 Are physical characteristics of the area/location or system documented? Yes, N/A 6 Isa remediation effectiveness discussion Included? Yes, N/A 7 Have characterization survey and/or sampling results been converted to units that are Yes, N/A comparable to applicable DCGL values? ,

6 Issurvey and/or sampling data that was used for determining survey unit variance included? Yes, N/A Isa description of the background reference areas (or materials) and their survey and/or Yes, N/A sampling results Induded along with a justification for their selection? ,

10 Are applicable survey and/or sampling data that was used to determine variability Induded? Yes, N/A 1 Will the condition of the survey area have an Impact on the survey design, and has the Yes, NIA probable impact been considered in the design?

Has any special area characteristic including any additional residual radioactivity (not 12 previously noted during characterization) been Identified along with its impact on survey Yes, N/A design?

13 Are all necessary supporting calculations and/or site procedures referenced or Included? Yes, N/A 14 Has an effective DCGLw been identified for the survey unit(s)? Yes, N/A 15 Was the appropriate DCGLEmc Included inthe survey design calculation? Yes, N/A 16 Has the statistical tests that will be used to evaluate the data been identified? Yes, N/A 17 Has an elevated measurement comparison been performed (Class I Area)? Yes, N/A 18 Has the decision error levels been Identified and are the necessary Justifications provided? Yes, N/A 19 Has scan Instrumentation been Identified along with the assigned scanning methodology? Yes, N/A 20 Has the scan rate been Identified, and Isthe MDCscan adequate for the survey design? Yes, NIA 21 Are special measurements e.g.. in-situ gamma-ray spectroscopy required under this design, Yes, N/A and Is the survey methodology, and evaluation methods described? Yes, _ _ _

22 Issurvey instrumentation calibration data induded and are detection sensitivities adequate? Yes, N/A 23 Have the assigned sample and/or measurement locations been dearly identified on a diagram Yes, N/A or CAD drawing of the survey area(s) alongwith their coordinates?

24 Are Investigation levels and administrative limits adequate, and are any associated actions Yes, N/A deardy indicated? .

25 For sample analysis, have the required MDA values been determined.? Yes, N/A 26 Has any special sampling methodology been identified other than provided in Reference 6.3? Yes, N/A NOTE: a copy of this completed form or equivalent, shall be induded within the survey design calculation.

d-h~ 41I i7-GFPC Radiation Measurement Instrument Calibration Worksheet Performed By: Thomas Madden Date 429104 Instrument SIN: 95348 Probe SIN 92501 (A)

Instrument Vendor Cal. Date: 513106 Cal. Due Date: 5/3106 Source No. ISO 7503-1 Values "Ca" Reference Date Ao in pCI (I 6%) 2x p or a Emission Rate (sec-1) (t 3%)

Am-241 (GO 535j S-023 0.25 418199 12:00 GMT 4.24E-01 7.43E+03 I A-Cs-137 (GO 536 S-024 0.50 418199 12:00 GMT 3.11E-01 6.89E+03 lI Cs437 Source Radionuclide Decay Date Cs-137 5116105 I_

Decay Factor= 8.687E-01 Elapsed Time (days)= 2230 Activity (pCI)=* 2.700E-01 Source dpm=:l 5.994E+05 VVI Source dpmfln Probe Area (cmA2)= 5.035E+05

-tN aI Probe Area (cmA2) 27t Emission Rate (sec-1)=

27?Emission Rate (min-1).

5.986E+03 3.591E+05 all, s'-13

_ 126 il 21T Emission Rate In Probe Area (min-1)= 3.017E+05 Record of 1 Minute Source & Background Counting Results Check if using ISO 7503-1 Value J"4 No. OW Source Gross CPM OW Background CPM OW Source Net CPM RESULTS 1 1.32E+05 972 1.309E+05 Counts/Emission (El)

I 2 1.32E+05 938 1.309E+05 43.4%

3 1.32E+05 947 1.309E+05 271Emission/Disintigration (Es) 4 1.31 E+05 964 1.305E+05 50.0%

5 1.33E+05 951 1.318E+05 Counts/Disintigration (Et)

. 1.32E+05 975 1.308E+05 21.7%

7 1.32E+05 997 1.308_+05 7 1.32E+05 946 1.309E+05 9 1.32E+05 942 1.309E+05 Approved:

• 10 1.33E+05 1005 1.318E+05

~11 Mean=* 963.7 1.310E+05 Date: J/ 1 7/i

'I l Calibration Calculation Sheet Verification Date=* December-02 I B. Brosey/P. Donnachie=fl December-02

43-37 GFPC Scan MDC Calculation MDCscan = 7311 dpm/100cm2 b = background in counts per minute bi = background counts in observation interval El = GFPC Detector / meter calibrated response in cpmldpm Es = Source efficiency emissions / disintegration Et = Net detector efficiency d = Index of sensitivity from MARSSIM Table 6.5 based on 95% detection, 60% false positive p = human performance adjustment factor - unitless SR = Scanning movement rate in centimeters per second MDCscan = MinimumDetectable Concentration for scanning in dpm/100cm2 C= Constant to convert MDCR to MDC Wd = Detector width in cm A= area of probe in cm2 01 = Observation interval in seconds DCGLeq = Net count rate equivalent to the Adjusted DCGL ECF = Efficiency correction factors (surface roughness)

AL = Action level, DCGLeq adjusted for d and p b= 1020 Jcpm p= 0.5 Wd= 13.3 cm SR = 30.5 JcMr/ d= l 1.38 l DCGL = 19834 ldpm/100 cm2 Ei=J 0.4 lcpmldpm Es=l 0.500 A= 100 cm 2 ECF= 0.5 l Es*Ei= 0.2 = Et Wd = 0.43607 =Oi (sec) b*Oi = 7.4 = bi (counts)

SR 60 (sec/min) 1 = 14.14 =C Ei*Es*ECF*AI100*sqrt(p) d*sqrt(bi)*60 = 517 =MDCRi (net cpm) MDCRi+b= 1537 = gross cpm at MDCRi Oi MDCRi

• C = MDCscan in dpm/l100cm2 DCGL*Ei*Es*ECF*A = 1983 = DCGLeq cpm 100 Attachment 4-3 E900-05-01 5

OL1 Concrete and Pavement Surfaces Survey Units Unit Area m2 Description MA8-6 76 Macadam - old SNEC parking lot, grid AU127 MA8-7 76 Macadam - old SNEC parking lot, grid AU128 MA8-8 76 Macadam - old SNEC parking lot, grid AU129 MA8-9 76 Macadam - old SNEC parking lot, grid AU130 MA8-10 102 Macadam - old SNEC parking lot, primarily grid AT131 MA8-11 42 Macadam - old SNEC parking lot, primarily grid AU1 31 MA8-12 73 Macadam - old SNEC parking lot, V shaped on N and E sides of AV131 MA8-13 100 Macadam - old SNEC parking lot, primarily grid AV131 MA8-14 33 Pavements around line shack MA8-15 37 Concrete slabs and blocks NW of CV MA8-16 93 Macadam - old SSGS driveway, grid AX131 MA8-17 58 Macadam - old SSGS driveway, grid AY131 PEI 37 Concrete - PAF floor slab DB5 54 Concrete - DSB Carport slab DBI-1 85 Concrete - DSB floor slab, west portion DB1-2 109 Concrete - DSB floor slab, east portion SS12 658 Concrete - SSGS Boiler Pad SS24-1 249 Concrete - SSGS on grade concrete North of the turbine hall SS24-2 321 Concrete - SSGS on grade concrete North of the turbine hall-under soil Attachment 5-1 E900-05-01 5

SS12 SSGS Boiler Pad Concrete N

Attachment 6-34 E900-05-01 5

SS12 SSGS Boiler Pad Floor Slab Measurements in FEET 658 sq meters X Coord Y Coord Label Value Type 36.7 10.7 FP-1 0 Systematic 64.0 10.7 FP-2 0 Systematic 91.2 10.7 FP-3 0 Systematic 23.1 34.3 FP-4 0 Systematic 50.3 34.3 FP-5 0 Systematic 77.6 34.3 FP-6 0 Systematic 104.9 34.3 FP-7 0 Systematic 36.7 57.9 FP-8 0 Systematic 64.0 57.9 FP-9 0 Systematic 91.2 57.9 FP-10 0 Systematic 118.5 57.9 FP-11 0 Systematic measured from pin AT135 Attachment 6-35 E900-05-01 5

SS24-1 SSGS north pad soil -v 1"- -

Pin AX133 Scan orange areas N

Attachment 6-36 E900-05-01 5

SS24-1 SSGS North Pad Measurements in FEET 249 sq meters X Coord Y Coord Label Type 24.2 4.6 FP-1 Systematic 41.0 4.6 FP-2 Systematic 57.7 4.6 FP-3 Systematic 15.8 19.1 FP-4 Systematic 32.6 19.1 FP-5 Systematic 24.2 33.7 FP-6 Systematic 41.0 33.7 FP-7 Systematic 57.7 33.7 FP-8 Systematic 15.8 48.2 FP-9 Systematic 32.6 48.2 FP-10 Systematic 49.4 48.2 FP-11 Systematic measured from pin AX133 Attachment 6-37 E900-05-01 5

SS24-2 North SSGS pad under soil 0 Scan Orange Aeas Origin PIN AP3135 N

Attachment 6-38 E900-05-01 5

SS24- SSGS North Pad under soil Measurements in FEET 231 sq meters X Coord Y Coord Label Type 16.9 12.6 FP-1 Systematic 31.8 12.6 FP-2 Systematic 46.7 12.6 FP-3 Systematic 61.6 12.6 FP-4 Systematic 76.5 12.6 FP-5 Systematic 24.4 25.5 FP-6 Systematic 39.3 25.5 FP-7 Systematic 54.2 25.5 FP-8 Systematic 69.1 25.5 FP-9 Systematic 16.9 38.4 FP-10 Systematic 31.8 38.4 FP-1 1 Systematic 46.7 38.4 FP-12 Systematic 61.6 38.4 FP-13 Systematic 76.5 38.4 FP-14 Systematic 24.4 51.3 FP-15 Systematic 39.3 51.3 FP-16 Systematic 54.2 51.3 FP-17 Systematic 69.1 51.3 FP-18 Systematic Measured from pin AX135 Attachment 6-39 E900-05-015

OLI 43-37 Backgrounds DSB Asph Boiler Pad 974 1025 971 953 941 1115 947 967 1000 999 974 985 873 911 1020 Z2&- f4g 902 953 978 949 mean 949.2 9522r 1018.2 std dev 47.2 57.1

{k4-  ?

Attachment 8-7 E900-05-01 5

37122N21 95348 . . ....

C.i I

/ _ _

0 DSBBKG1 5/12105 14:09 5 974 60 SCL 1 DS8BKG2 5/12/05 14:11 _ 953 60 SCL 2 DSBBKG3 5/12/05 14:12 _ 947 60 SCL 3 DS8BKG4 5/12105 14:14 5 999 60 SCL 410SDBKG5 5/12105 14:15 5 873 60 SCL 51ASPHBKG1 5/12/05 14:18 5 1025 60 SCL 61ASPHBKG2 5/1205 14:20 5 941 60 SCL 71ASPHBKG3 5/12105 14:21 5 967 60 SCL 8 ASPHBKG4 5112/05 14:23 5 974 60 SCL 9 ASPH8KG5 5112105 14:25 5 911 60 SCL 10 8PADBKGI 5/12/05 14:30 5 971 60 SCL 11 BPADBKG2 5/12105 14:32 5 1115 60 SCL 12 BPADBKG3 5/12/05 14:34 5 1000 60 SCL 13 BPADBKG4 5/12105 14:36 5 955 60 SCL 14 BPADBKG5 5/12/05 14.38 5 1020 60 SCL 15 ASP2BKGI 5/12105 14:41 5 928 60 SCL 16 ASP28KG2 5/12/05 14:42 _ 5 902 60 SCL 17 ASP2BKG3 5/12105 14:44 5 953 60 SCL 18 ASP2SKG4 5112/05 14:451 5 978 60 SCL 19 ASP28KG5 5/1205 14:471 5 949 60 SCL LOGGED DATA DUMP COMPLETED. _ ____ I_ _ I q)-37 eof,(,I/d 0 -'s/ ,,/ iA --elt -

Attachment 8-8 E900-05-01 5 Z0 3E)Vd NO2a d A1IIDVJ 03NS LIUSESPIS l0 :t GOOZ/91/90

Appendix C Surfaces Survey Design Revision 2

ORIGINAL SNEC CALCULATION COVER SHEET CALCULATION DESCRIPTION Calculation Number Revision Number Effective Date Page Number E900-05-015 2 1 of 14 Subject OL1 Paved and Miscellaneous concrete surfaces MA8, PFI, DB5, DBI, SS12, SS24 - Survey Design Question I - Is this calculation defined as In QA Scope? Refer to definition 3.5. Yes 0 No []

Question 2 - Is this calculation defined as a 'Design Calculation'? Refer to definitions 3.2 and 3.3. Yes El No I]

NOTES: If a 'Yes' answer is obtained for Question 1, the calculation must meet the requirements of the SNEC Facility Decommissioning Quality Assurance Plan. If a 'Yes' answer is obtained for Question 2, the Calculation Originators Immediate supervisor should not review the calculation as the Technical Reviewer.

DESCRIPTION OF REVISION 1 - Revision 1 adds the use of the 43-37 extra large probe to the design. Numerous additions are made to provide setpoints, mdcr, useage protocols, etc. and attachments. The complete text of pages 1 through 13 is provided here, but only the added attachments are included. This revision also adds the survey units and layout for the concrete in the SSGS area OL1-8.

2- Revision 2 adds edge and sub-slab soil samples to the DSB pad area. Eleven samples are defined.

The complete text of the revision is provided here, but only the two additional attachments (6-40 and 6-41 are included.

APPROVAL SIGNATURES Calculation Originator JW. J. Cooper CHP/

Technical Reviewer B. Brosey! e .

Additional Review A. Paynteri Ok A K Additional Review

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 2 Page 2 of 14 Subject OL1 Paved and Misc. concrete surfaces MA8, PF1, DB5, DBI, SS12, SS24 - Survey Design 1.0 PURPOSE 1.1 The purpose of this calculation is to develop a survey design for the residual concrete surfaces in the Saxton Nuclear Experimental Corporation SNEC and SSGS site areas. The total area (OL1) including the soil and solid surface portions is approximately 11600 square meters. Portions of the solid surface (concrete, macadam, brick) are Classl, Class 2, and Class 3 survey areas. Because the survey area exceeds the size limitations in the SNEC LTP (Reference 3.5) Table 5-5 for maximum Class 1 survey unit area and it includes survey units of all three classifications, this survey area is subdivided into multiple survey units: OL1-7 is an existing excavation in the SNEC site area, that will be backfilled after survey. OL1-8 through OLl-13 are subdivisions of the large open land area and comprise the majority of the total surface area. These open land areas and the excavation are covered by other design calculations. Several additional areas comprise the residual exposed concrete and macadam surfaces:

1.1.1 PF1 is a pre-existing Class 1 survey unit for the Personnel Access Facility (PAF) floor and includes the north edge of the PF1 portion of the slab with approximately 37 m2 1.1.2 DB1 is a pre-existing Class 1 survey area for the Decommissioning Support Building (DSB) floor pad and door ramp. This area is further divided into two survey units due to LTP survey unit area limitations. DBI-1(85 m2) and DB1-2 (109 M2) with 194 m2 total. DB1-1 includes the full width of the north edge of the DSB portion of the pad.

1.1.3 DB5 is a pre-existing Class 1 survey unit for the DSB carport floor of approximately 54 m2 1.1.4 SS12 is a pre-existing survey area for the SSGS boiler pad. This concrete, although it is in a Class 1 soil area, is classified as Class 3 in the LTP Table 5-2. Some minor details of residual concrete hidden by soil may be present. This will not affect the survey since it is class 3 and only 10% scan is needed. Since SS12 is Class3, the entire pad is a single survey unit of approximately 658 M 2 .

1.1.5 SS24-1 is a Class 3 survey unit defined for the miscellaneous SSGS pads north of the turbine hall. There is likely to be a buried portion of this slab west of this area which is separately defined as SS24-2. Since SS24 is Class 3, the entire exposed pad is a single survey unit. Design scan area is 105 m2. The west edge of the exposed concrete is uneven and the area is approximately 249 in2 .

1.1.6 SS24-2 is a Class 3 survey unit defined for the miscellaneous SSGS pads north of the turbine hall. This is a buried portion of this slab west of the area defined as SS24-1. This area must first be surveyed as open land per E900-05-014, then cleared of soil and the residual concrete surveyed per this design. Since SS24 is Class 3, the entire buried portion of the pad is a single survey unit. Design scan area is 118 M2 . The area is approximately 321 M 2 .

1.1.7 MA8-6 through 13, 16, and 17: Ten survey units of the old parking lot and driveway macadam. Because of the 100 m2 survey unit limitation for Class I surfaces, the surface was subdivided into ten approximately 100 M2 (or less) survey units. The pavement occupies all of, or a large portion of, grids AT131, AU127, AU128, AU129, AU130, AU131, AV130, AV131, AW131, AX131, AY131. These are all class 1 survey units due to verbal reports of minor remediation and due to their proximity to

-SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 2 I Page 3 of 14 Subject OL1 Paved and Misc. concrete surfaces MA8, PFI, DB5, DBI, SS12, SS24 - Survey Design the C&A building, the barrel bunker, and containment. Total area is about 772 M2.

General arrangement of these units is shown in the drawing Attachment 6-17.

1.1.8 MA8-16 and MA8-17 have about 4 to 6 inches of soil on top of the pavement. This soil is to be surveyed per E900-05-014 and then removed and placed in a PRI pile to allow the pavement survey per this design.

1.1.9 MA8 the Line Shack concrete including garage door ramps and sidewalks. This area is not specifically classified in the SNEC LTP (Reference 3.5) but is selected to be class 2 consistent with the class 3 classification of the line shack exterior and the class 1 assigned to the surrounding soil. This is a Class 2 survey unit with about 33 m2 total area.

1.1.10 MA8-15 is additional concrete surfaces around the CV. There is some SSGS concrete and additional small monoliths in OL1-9 NW of the CV. This small concrete area is not specifically addressed in the SNEC LTP but is assumed to be Class I due to proximity to the CV and is about 37 M2.

1.1.11 A summary list of survey unit areas is included as Attachment 5-1.

1.1.12 Eleven biased (but arbitrarily located) soil samples are defined in and around the DSB/PAF/Carport slabs. Although arbitrarily located (pseudo-random), eleven samples are selected to represent a typical MARSSIM fixed point sample number.

1.2 This survey design applies only to the residual concrete, macadam, and other paved surfaces in the survey area. The design for the open land areas, fences, the east yard excavation, and the portion of OL1 covering the SSGS will be provided in separate calculations. The general layout of this survey unit is shown on Attachment 1-1.

1.3 If additional areas of concrete not identified here are found under soil, this design may to be revised to include the additional area.

2.0

SUMMARY

OF RESULTS The following information should be used to develop a survey request for this survey unit. The effective DCGLw value is listed below. This value is derived from previously approved derived values for 'CV Yard Soil and Boulders", Attachment 2 in SNEC calculation E900-04-005 (Reference 3.15). The US NRC has reviewed and concurred with the methodology used to derive these values.

See Attachment 2-1 and Reference 3.9.

Table 1, DCGLw Values l GrossActlvltyDCGLw(dpm11Wcm') l 26445 (19834 A.L.) l NOTE: A.L is the site Administrative Limit (75% of effective DCGLw) 2.1 Survey Design 2.1.1 Scanning of concrete and macadam surfaces shall be performed using a L2350 with 43-68B gas flow proportional counter or a 43-37 'extra large' probe calibrated to Cs-137 (see typical calibration information on Attachments 3-1 and 3-2). Generic approval for use of the 43-37 is included in Reference 3.10.

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 2 Page 4 of 14 Subject OLI Paved and Misc. concrete surfaces MA8, PFI, DB5, DBI, SS12, SS24 - Survey Design 2.1.2 The instrument conversion factor/efficiency (Et) shall not be less than that assumed on Attachment 4-1 as 23.9% - Cs-137 for the 43-68B nor less than 20.0%-Cs137 for the 43-37 in its lowest efficiency region as assumed on Attachment 4-3.

2.1.3 Other instruments of the types specified in Section 2.1.1 above may be used during the final status survey (FSS), but must demonstrate detection efficiencies at or above the values listed in Section 2.1.2 above.

2.1.4 An efficiency correction factor (ECF) is applied to compensate for efficiency loss when surveying rough surfaces based on Reference 3.1 and Attachment 2-2.

2.1.5 The fraction of detectable beta emitting activity affects the efficiency and is determined by the nuclide mix. The mix detectable beta fraction is determined to be 60% based on Reference 3.15. Because the adjusted DCGLw used is based only on the modified Cs-137 DCGLw, the mix percentage is not applied to the adjusted surrogate DCGLw. The gross activity DCGLw, which would include all the low energy activity and would require mix percentage adjustment is considerable higher, at 44434 dpm 100cm2 . The Cs-137 adjusted surrogate activity already accounts for the detectable beta yield of the mix.

2.1.6 The ECF is derived from Attachment 2-2 and Reference 3.1 based on a surface irregularity of 3 inches or less FOR THE 43-68B DETECTOR. This is conservative, as actual observed irregularity is typically less than one inch. Also, the loss of efficiency is based on moving the detector away from a 150 cm2 source. If the area of the residual activity is larger, than the efficiency loss would be smaller due to the increase in 'field-of-view' of the detector.

2.1.7 The ECFs developed for the 43-68B probe per reference 3.1 are assumed to apply to the 43-37. The ECF for the 43-37 are based on the ASSUMPTION that the detector face will not be more than about 1 inch farther from the surface than from the source in the test jig (0.5 inches apart) and that the surface will be fairly smooth, typical of poured concrete or macadam.

2.1.8 Because the alarm point and MDCscan are based on the highly conservative surface irregularity assumptions (intended to bound all cases to simplify design and performance of the survey), where surfaces are much smoother (e.g. 1 inch irregularity or less per probe area for the 43-68B) than the assumed 3 inch variability, short (e.g. Y to 1 inch) standoff support pegs may be attached to the 43-68B in order to reduce the possibility of mylar damage. These standoffs must only be used when the surface smoothness is well within the assumed 3 inch variability.

Because the high surface irregularity is assumed and used for the efficiency of the instrument for the entire design, this standoff will not affect the assumed efficiency if limited as discussed above.

SNEC CALCULATION SHEET Calculation Number Revsion Number Page Number E900-05-015 2 Page 5 of 14 Subject OLI Paved and Misc. concrete surfaces MA8, PFI, DB5, DBI, SS12, SS24 - Survey Design Table 2, GFPC Detection Efficiency Results Used for Planning Detector Material Type El Es Egas %) ECF Adjusted efficiency 43-68B Concrete or asphalt .478 .5 23.9 .2 4.8%

43-37 Concrete or asphalt .4 .5 20.0 .5 10.0%

Table 3, Surface Scanning Parameters for Solid Misc. Concrete & Pavement Sections MDCscan Scan Speed Maximum Distance from Surface DCGLw Action  %

tector (dpm1lOOcM2), (cmrsec) Level Coverage 43-68B 4634 10 3' (gap between detector face & > 1450 qpm Up to surface or 3 inch irregularity) 100%

43-37 7311 30.5 1.5. (gap between detector face & >2900 cpm 100%

srface~ Upto See Attachment 2-1, 2-2,4-1, and 4.3 for calculations' 2.1.9 The 43-68B MDCscan (shown in Attachment 4-1) is based on a 300 cpm background. Typical backgrounds are similar to this value assumed, as shown in the variability data shown as 'CW" (closed window or shielded detector) in Attachment 8-2. Unaffected material backgrounds were determined at the Williamsburg station, which resulted in a mean background value of 306 cpm +/- 34.5. On 3/7105, measurements were collected on three different surfaces in OL1: the DSB pad, the old parking lot, and the SSGS boiler pad.

2.1.10 The 43-37 MDCscan (shown in Attachment 4-2) is based on a 1020 cpm background. On 5/12105, measurements were collected on three different surfaces in OLI: the DSB pad, the asphalt, and the SSGS boiler pad. These are shown in Attachment 8-7 and Attachment 8-8.

2.1.11 The 43-37 detector is to be used as a screening process.

2.1.11.1 Since the efficiency is determined with the same source as used for the 43-68B, the effective area of the detector is assumed to be 100 cm2 for determining the MDCscan. This will underestimate the response of the detector to larger sources but produce similar efficiencies and MDCs as for the 43-68B.

2.1.11.2 Scanning using the 43-37 will be done only on flat surfaces with surface irregularities typical of poured concrete or rolled macadam pavement. Uneven surfaces, edges, etc. will be scanned with the 43-68B.

2.1.11.3 Because the 43-37 has a much larger effective surface area than the 43-68B, and the MDC and action level are based only on a 100 cm2 elevated spot, the 43-37 may provide action level count rates on larger diffuse source areas that actually are less than the DCGL. Therefore, the 43-37 will be used

7 SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 2 Page 6 of 14 Subject OL1 Paved and Misc. concrete surfaces MA8, PF1, DB5, DB1, SS12, SS24 -Survey Design to screen surfaces and will be considered to be the 'official' results only if no action levels are observed.

2.1.11.4 Any action levels observed with the 43-37 will be rescanned with the 43-68B. If no AP is observed with the 43-688, there is no AP. APs observed in follow-up rescans with the 43-68B will be handled and documented in the SR per section 2.1.16 below.

2.1.11.5 Fraction scanned with the 43-37 and results should be separately reported in the SR for each survey unit / grid/ etc. in a similar manner as used for the 43-68B. E.G. '90% scanned with 43-37, one alarm rescanned with 43-68B no 43-68B AP'.

2.1.12 The 37105 survey data shown as "OW" (open window or unshielded) is used for the variability assessment for the COMPASS determination of sample requirements and is shown in Attachment 8-2.

2.1.13 A background of 1300 cpm for the 43-68B would still result in MDCscan less than about 50% of the DCGLw (Attachment 4-2). Since the Action level cited in Table 3, above, is total counts per minute including background, if local backgrounds significantly exceed the background count rate assumed for the MDCscan (about 300cpm for the 43-68B see - Attachment 4-1 or 1020 cpm for the 43 see Attachment 4-3) contact the cognizant SR coordinator to determine need for additional background count rate adjustments.

2.1.14 The scan DCGLw Action Level for the 43-68B listed in Table 3 includes 1200 cpm DCGL equivalent count rate from Attachment 4-1 and an estimated 260 cpm background . The DCGLw action level is based on fixed measurement and does not include 'human performance factors' or 'index of sensitivity' factors (see Reference 3.12).

2.1.15 The scan DCGLw Action Level for the 43-37 listed in Table 3 includes 1950 cpm DCGL equivalent count rate from Attachment 4-3 and an estimated 950 cpm background. Although the 43-37 is assumed to be geometrically and functionally equivalent to the 43-68B for MDC and action level determination (a conservative assumption), the ECFs and probe areas are different and therefore result in a higher net count rate for the action level for the 43-37. The DCGLw action level is based on fixed measurement and does not include 'human performance factors' or 'index of sensitivity' factors (see Reference 3.12).

2.1.16 If a total count rate greater than the "DCGLw action level' of Table 3 is encountered during the scanning process with a 43-688, the surveyor should stop and locate the boundary of the elevated area, and then perform a "second phase" fixed point count of at least 30 seconds duration. If the second phase result equals or exceeds the DCGLw action" level noted in table 3, the surveyor should then mark the elevated area with appropriate marking methods and document the count rate observed and an estimate of the affected area. Subsequent investigation may take the actual surface irregularity into account for the efficiency.

2.1.16.1 Class I concrete should be scanned to include 100% surface coverage at a scan rate of about 10 cm per second for the 43-68B or 30.5 cm per second for the 43-37. All accessible surfaces are required to be scanned. Areas that

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 2 Page 7 of 14 Subject OLI Paved and Misc. concrete surfaces MA8, PFI, DB5, DBI, SS12, SS24 - Survey Design cannot be accessed should be clearly noted along with the reason for not completing the scan in that area.

2.1.16.2 Class 2 concrete would normally be scanned to include 10% to 100%

surface coverage. Only the concrete around the line shack is class 2. Due to the small size of the unit and the distribution of small areas, the unit (MA8-14) will be 100% scanned at a scan rate of about 10 cm per second for the 43-68B or 30.5 cm per second for the 43-37. Areas that cannot be accessed should be clearly noted along with the reason for not completing the scan in that area.

2.1.16.3 Class 3 concrete would normally be scanned to include up to 10% surface coverage. The concrete and pavement in and around the SSGS is class 3 and will be approximately 10% scanned at a scan rate of about 10 cm per second for the 43-68B or 30.5 cm per second for the 43-37. Three 25 square meter scan areas are shown on Attachment 6-34 for SS12, two regions totaling 105 square meters are shown on Attachment 6-36 for SS24-1, and two regions totaling 118 square meters are shown on Attachment 6-38 for SS24-2. Areas that cannot be accessed should be clearly noted along with the reason for not completing the scan in that area.

2.1.16.4 See Attachment 1-1 forgrid layoutforthe survey units.

2.1.16.5 The surfaces of the concrete or other pavement materials should be clear of debris to ensure detection parameters are not affected.

2.1.17 The minimum number of fixed measurement sampling points indicated by the COMPASS computer program (Reference 3.3) is 11 for each survey unit (see COMPASS output on Attachment 7-1 to 7-5). Fixed point measurements should be done only with the 43-68B lAW Section 2.2. The MDCscan (concrete) is below the effective administrative DCGLwc>, 37 (4634 DPM/1OOcm 2 MDCscan @300cpm bkg <

19834 DPM/1 OOcm 2 AL for the 43-68B and 7311 DPM/1 OOcm 2 MDCscan

@1020cpm bkg < 19834 DPMIOOcm 2 AL for the 43-37).

2.1.18 The minimum number of fixed point samples is increased to 13 (18% increase) for survey unit DBI-2 due to the slightly oversized (109 m2 , 9% over LTP guideline) area of the unit. This oversize is due to the selection of a grid line as the separation point between DB1-1 and DB1-2. Survey Unit DB1-1 is only 85 M2. Since both units are class 1, the DSB pad will be 100% scanned regardless of the survey unit separation. Relocation of the arbitrary separation line could make these both equal and <10Om 2 but is not considered to be useful since: separation on a grid line simplifies survey layout, the two units combined are <200 m2 , and the two units combined have more than the required number of fixed points (26 total vs. 22 required per MARSSIM).

2.1.19 One Biased direct measurement point is placed in DB1-1 on the face of the exposed slab. This point should be taken centered vertically on the vertical face at the 128 grid line.

.SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 2 Page 8 of 14 Subject OL1 Paved and Misc. concrete surfaces MA8, PFI, DB5, DB1, SS12, SS24 - Survey Design 2.1.20 The minimum number of sample points for SS24-2 is increased to 18 to account for the unknown extent of the concrete below the soil layer to provide sufficient samples if some areas are not concrete.

2.1.21 VSP (Reference 3A) is used to plot all sampling points on the included diagrams.

The actual number of random start systematically spaced measurement points may be greater than that required by the COMPASS computer code because of any or all of the following:

• placement of the initial random starting point (edge effects),

• odd shaped diagrams, and/or

• coverage concerns (see Attachment 6-1 to 6-39 for VSP sampling point locations) 2.1.22 Because this design is a conglomerate of multiple slab surfaces into multiple survey units, the sample point locations are not derived from a single starting point.

Measurement location details for the sample points are provided in the diagrams in Attachment 6.

2.1.23 Some sampling points may need to be adjusted to accommodate obstructions within the survey area. Contact the SR coordinator to report any difficulties encountered when laying out systematic grid sampling points.

2.1.24 Because of the unusual arrangement of this survey area, with multiple disjointed slabs that do not correspond directly to single grids, the drawings in Attachment 6 are intended to be as close as practicable to as-left conditions. However, if actual layout is different from that shown, review with the cognizant SR coordinator, finish the survey if practicable, and mark up the drawings to indicate actual layout.

2.1.25 When an obstruction is encountered that will not allow collection of a sample, contact the cognizant SR coordinatorfor permission to delete the sampling point.

2.1.26 DSB slab area soil samples are to be 1 meter thick surface samples. Edge samples shall be as close as practicable to the slab. Sub-slab samples will be 1 meter thick v after removal of the concrete. Any engineered fill will be included in the sample. Use OL1 soil (E900-05-014) DCGLs (Reference 3.17).

NOTE If remediation actions are taken as a result of this survey, this survey design must be revised or re-written entirely.

2.2 Measure concrete fixed point and elevated areas(s) IAW SNEC procedure E900-IMP-4520.04 sec 4.3.3 (Reference 3.2) and the following.

2.2.1 Use only the 43-68B to confirm and 'finalize' elevated area measurements or to collect fixed point measurements.

2.2.2 Clearly mark, identify and document all sample locations.

2.3.1 Second phase scan any location that is above the action level cited in Table 3.

_ L. SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 2 Page 9 of 14 Subject OLI Paved and Misc. concrete surfaces MA8, PF1, DB5, DBI, SS12, SS24 - Survey Design 2.3.2 Investigation of APs may require surface and sub-surface samples per the LTP section 5.5.3.4.5 (Reference 3.5).

3.0 REFERENCES

3.1 SNEC Calculation number 6900-02-028, 'GFPC Instrument Efficiency Loss Study" 3.2 SNEC Procedure E900-IMP-4520.04, 'Survey Methodology to Support SNEC License Termination".

3.3 COMPASS Computer Program, Version 1.0.0, Oak Ridge Institute for Science and Education.

3.4 Visual Sample Plan, Version 3.0, Copyright 2004, Battelle Memorial Institute.

3.5 SNEC Facility License Termination Plan.

3.6 SNEC Procedure E900-IMP-4500.59, "Final Site Survey Planning and DQA".

3.7 SNEC survey 43-68B GFPC measurements in OL1 dated 3/7105 3.8 GPU Nuclear, SNEC Facility, 'Site Area Grid Map", SNECRM-020, Sheet 1, Rev 4, 1/18105.

3.9 SNEC Calculation No. E900-03-012, Effective DCGL Worksheet Verification.

3.10 SNEC calculation E900-05-031 mUse of the 43-37 Detector and Ludlum 239 Floor Monitor for FSS Surveys" 3.11 SNEC Procedure E900-IMP-4520.06, "Survey Unit Inspection in Support of FSS Design".

3.12 NUREG-1575, Multi-Agency Radiation Survey and Site Investigation Manual", August, 2000.

3.13 Microsoft Excel 97, Microsoft Corporation Inc., SR-1 and SR-2, 1985-1997.

3.14 Left intentionally blank 3.15 SNEC Calculation E900-04-005 "CV Yard Survey Design - North West Side of CV" 3.16 SNEC survey 43-37 GFPC measurements in OL1 dated 5/12/05 3.17 SNEC Calculation No. E900-05-014 "SNEC Plant Area Open Land - OLI - Survey Design" l v 4.0 ASSUMPTIONS AND BASIC DATA 4.1 The COMPASS computer program is used to calculate the required number of random start systematic samples to be taken in the survey unit (Reference 3.3).

4.2 Reference background data from offsite at the Williamsburg station were used as the initial estimate of variability. These results are shown on Attachment 8-1 and in Reference 3.15.

Additional variance data that is used to assess sampling requirements is derived from the survey, Reference 3.7. Background data for the 43-37 is not used for variability assessment, since the fixed point data is only collected with the 43-68B 4.3 The MARSSIM Sign Test (Reference 3.12) will be applicable for this survey design. No background subtraction will be performed under this criteria during the DQA phase.

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 2 Page10of14 Subject OL1 Paved and Misc. concrete surfaces MA8, PF1, DB5, DBI, SS12, SS24 - Survey Design 4.4 The required points chosen by COMPASS are located on the survey map for the survey unit by the Visual Sample Plan (VSP) computer code (Reference 3.4).

4.5 Reference 3.5 and 3.6 were used as guidance during the survey design development phase.

4.6 Background for the 43-68B detector has been measured in the area, and ranges from about 250 to 300 cpm with averages of slightly less than 300 cpm (Reference 3.7). These recent survey result averages are used as the basis for the MDCscan. Background for the 43-37 detector has been measured in the area, and ranges from about 875 to 1100 cpm with averages of about 950 cpm to 1020 cpm (Reference 3.16 and Attachment 8-7). These recent survey result averages are used as the basis for the MDCscan.

4.7 The determination of the physical extent of this area is based on the drawing Reference 3.8 and a thorough walkdown / measurement of the survey unit.

4.8 Remediation History:

4.8.1 OL1 is an open land area. Portions contained the original SNEC site facility and the Saxton Steam Generating Station. Extensive remediation has occurred in the survey area.

The SNEC Radwaste building (RWDF), Control and Auxiliary (C&A) building, Containment Vessel (CV), the SSGS, various buried pipe tunnels and underground tanks were all removed to grade or below. The residual portions of the buildings have been previously surveyed and the release surveys have been accepted.

4.8.2 The SSGS was backfilled when it was permanently shut down. Subsequently, residual licensed activity was found using core bores. The SSGS backfill was removed and surveyed through an automated conveyor system. Additional concrete surfaces in the SSGS basement were remediated and then the scanned backfill was replaced following survey.

4.8.3 The underground tank excavation was backfilled after the tanks were removed early in the project. This backfill was removed and scanned using a automated conveyor scanning system and is currently stored for re-use.

4.8.4 The barrel bunker was removed as part of the remediation process.

4.8.5 Underground drainage, sewerage systems and surface soils have been removed.

4.8.6 Some pavement was remediated during the building removal phase.

4.9 This survey design uses Cs-137 as a surrogate for all SNEC facility related radionuclides in the survey unit. The effective DCGLw is* the Cs-1 37 DCGLw from the SNEC LTP (28000 dpm/1 00cm2 ) adjusted (lowered) to compensate for the presence (or potential presence) of other SNEC related radionuclides (Reference 3.9). In addition, an administrative limit (75%) has been set that further lowers the permissible Cs-137 concentration to an effective surrogate DCGLw for this survey area.

The sample database used to determine the effective radionuclide mix for the OL1 area has been drawn from samples that were assayed at off-site laboratories. This nuclide mix is copied from Reference 3.15.

The GFPC detector scan MDC calculation is determined based on a 10 cm/sec scan rate, a 1.38 index of sensitivity (95% correct detection probability and 60% false positive) and a

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 2 I Page 11 of 14 Subject OL1 Paved and Misc. concrete surfaces MA8, PF1, DB5, DBI, SS12, SS24 - Survey Design detector sensitivity (Et) of 23.9% cpm/dpm for Cs-137 for the 43-68B and 20% for the 43-

37. The expected range of background values varies from about 250 cpm to about 300 cpm for the 43-68B detector and about 875 cpm to about 1100 for the 43-37.

4.10 The survey unit described in this survey design was inspected after remediation efforts were shown effective. A copy of the specific portion of the SNEC facility post-remediation inspection report (Reference 3.11) applicable to this design is included as Attachment 9-1.

4.11 No special area characteristics including any additional residual radioactivity (not previously noted during characterization) have been identified in this survey area.

4.12 The decision error for this survey design is 0.05 for the a value and 0.1 for the p value.

4.13"Special measurements' (as described in the SNEC LTP, Reference 3.5) are included in this survey design. Section 5.5.3.4.5 discusses pavement surveys. This survey design is consistent with the LTP. Use of the 43-37 detector as a screening device may be considered a 'special measurement'. Use is explained and authorized in a SNEC calculation (Reference 3.10).

4.14 Special measurements and sampling processes have been specified for revision 2 sub-slab sampling of the DSB pad area. The sample design is a limited biased sample regime to provide updated information on the sub-slab radiological status (SNEC LTP section 5.5.3.4.7). The soils at the edge of the slab are assumed to represent the sub-slab soils, and several samples are collected through core-bore holes in the slab.

4.15 No additional sampling will be performed lAW this survey design beyond that described herein.

4.16 SNEC site radionuclides and their individual DCGLw values are listed on Exhibit I of this calculation based on Table 5-1 in Reference 3.5. 7 4.17 The survey design checklist is listed in Exhibit 2.

4.18Area factors are shown as part of COMPASS output (see Attachment 7-1) and are based on the Cs-137 area factors from the SNEC LTP.

5.0 CALCULATIONS 5.1 All calculations are performed internal to applicable computer codes or within an Excel (Reference 3.13) spreadsheet.

6.0 APPENDICES 6.1 Attachment 1-1 is the general layout diagram of the survey units.

6.2 Attachment 2-1 and 2-2 are the DCGLw calculation logic for the survey unit from Reference 3.15 and the estimate of effect on efficiency of the irregular surface.

6.3 Attachment 3-1, is a copy of the calibration data from typical 43-68B GFPC radiation detection instrumentation that will be used in this survey area. Attachment 3-2, is a copy of the calibration data for a typical 43-37 GFPC radiation detection instrumentation that will be used in this survey area.

6.4 Attachment 4-1, is the 43-68B MDCscan calculation sheet for concrete (and macadam) surfaces in dpm/1OOcm 2. Attachment 4-2 shows the effect of elevated background on the 43-68B MDCscan. Attachment 4-3 is the 43-37 MDCscan calculation sheet for concrete (and macadam) surfaces in dpm/1 00cm2 .

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 2 Page 12 of 14 Subject OL1 Paved and Misc. concrete surfaces MA8, PF1, DB5, DBI, SS12, SS24 - Survey Design 6.5 Attachment 5-1, is a summary list of survey units included in this design, with the estimated area of each.

6.6 Attachment 6-1 through 6-39, show the randomly picked scan locations (from VSP) and reference coordinates for the survey unit areas. Attachments 6-40 and 641 show the biased sub-slab soil sample points for the DSB pad area.

6.7 Attachment 7-1 through 7-5, are COMPASS output for the survey unit showing the number of sampling points in the survey unit, area factors, and prospective power.

6.8 Attachment 8-1, is the surface variability results for concrete surface measurements from the Williamsburg station (Reference 3.15). Attachment 8-2 is the summary of 43-68B backgrounds and surface measurements taken in the survey unit. Attachments 8-3 through 8-6 are copies of the survey used for variability. Attachment 8-7 is the summary of 43-37 backgrounds and surface measurements taken in the survey unit which are shown in Attachment 8-8.

6.9 Attachment 9-1,is the results of the inspection report for the residual surface portion of the OLI area. Attachments 9-2 through 9-5 are the surface test measurement data.

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 2 Page 13 of 14 Subject OL1 Paved and Misc. concrete surfaces MA8, PF1, D85, DBI, SS12, SS24 - Survey Design Exhibit I SNEC Facility Individual Radionuclide DCGL Values (a) 25 mremly Limit 4 mremly Goal 25 mremly Limit (All Pathways) (Drinking Water)

Radionuclde Surface Area Open Land Areas Open Land Areas (b)

(dpm/100cm 2 ) (Surface & Subsurface) (Surface & Subsurface)

(pC11g) (pCilg)

Am-241 2.7E+01 9.9 2.3 C-14 3.7E+06 2 5.4 Co-60 7.IE+03 3.5 67 Cs-137 2.8E+04 6.6 397 Eu-152 1.3E+04 10.1 1440 H-3 1.2E+08 132 31.1 Ni-63 1.8E+06 747 1.9E+04 Pu-238 3.OE+01 1.8 0.41 Pu-239 2.8E+01 1.6 0.37 Pu-241 8.8E+02 86 19.8 Sr-90 8.7E+03 1.2 0.61 NOTES:

(a)While drinking water DCGLs will be used by SNEC to meet the drinking water 4 mremrly goal, only the DCGL values that constitute the 25 mremly regulatory limit will be controlled under this LTP and the NRCs approving license amendment.

(b) Usted values are from the subsurface model. These values are the most conservative values between the two models (i.e.,

surface & subsurface).

B V SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-015 l 2 l Page 14 of 14 Subject OLI Paved and Misc, concrete surfaces MA8, PF1, DB5, DBI, SSI 2, SS24 - Survey Design Exhibit 2 Survey Design Checklist Calculation No. l Location Codes SNEC plant areas: OLI Paved and Miscellaneous E900-05-015 rev I l concrete surfaces MA8, PF1, DB5, DBI, SSI2 SS24 TEM ITEMREVEW REVIEWuFOCUS FCUS(Circle Sts Reviewer One) Initials & Date I Has a survey design calculation number been assigned and is a survey design summary a , N/A ago description provided? (ofIi 2 Are drawings/diagrams adequate for the subject area (drawings should have compass SA headings)? 1 Are boundaries property identified and isthe survey area classification clearly indicated? < N/A 4 Has the survey area(s) been properly divided into survey units IAW EXHIBIT 10 , N/A 5 Are physical characteristics of the area/location or system documented? , N/A b 6 Isa remediation effectiveness discussion included? 0Y N/A tin/

7 Have characterization survey and/or sampling results been converted to units that are N/A .0 t

.comparable to applicable DCGL values? 6Q. -A91D 8 Is survey and/or sampling data that was used for determining survey unit variance included? eyes.) N/A 9 Is a description of the background reference areas (or materials) and their survey and/or Yerg, ) e sampling results includedialong with 2 justification for their selection? &wb 10 Are applicable survey andlor sampling data that was used to determine variability included?

es N/A (3'0 1

161 o5' Will the condition of the survey area have an impact on the survey design, and has the v.

probable impact been considered in the design? Yes____ l Le Has any special area characteristic including any additional residual radioactivity (not (pT 12 previously noted during characterization) been identified along with is impact on survey Ye3^ , A design?

13 Are all necessary supporting calculations and/or site procedures referenced or included? Y Ve N/A bo cCo 14 Has an effective DCGLw been identified for the survey uni(s)? N _A_SO'_t_ _v 15 Was the appropriate DCGL4w included in the survey design calculation?e < l <) lL 16 Has the statistical tests that will be used to evaluate the data been identified? N(A9 J <,cD 17 Has an elevated measurement comparison been performed (Class 1 Area)? Yes, (DA 18 Has the decision error levels been identified and are the necessary justifications provided? s N/A 9I t 19 Has scan Instrumentation been Identified along with the assigned scanning methodology? I- rA 20 Has the scan rate been identified, and Isthe MDCscan adequate for the survey design? es N/A l, 21 Are special measurements e.g., in-situ gamma-ray spectroscopy required under this design, and is the survey methodology, and evaluation methods described?

22 Issurvey instrumentation calibration data included and are detection sensitivities adequate? L35lb/D 23 Have the assigned sample andfor measurement locations been clearly identified on a diagram N/A WA 0P I or CAD drawing of the survey area(s) along with their coordinates? _ _ _ 0 1b 24 Are investigation levels and administrative limits adequate, and are any associated actions WN/A f clearly indicated? _ I IO 25 For sample analysis, have the required MDA values been determined.? Yes ) 35*

26 Ha any special sampling methodology been identified other than provided in Reference 6.3? Yes&) ( l NOTE: a copy of this completed form or equivalent, shall be included within the survey design calculation.

DSB Sub-Slab Sample Layout PAF floor slab PF1 DSB floor slab DBt&2 DB1-2SP1

__ CarpcAt slab DB5 Xu-,

W !S~ t;~j 0 DBI1-SP3 SP,,e 9W>

I ..DB5SP1 0

DB, 1SPI

.DBI-2SP3~

Attachment 6-40 E900-05-015 R2

DSB Pad Sub-Surface soil sample layout Sample Location PF1SPI West edge of PAF slab, 13 feet N of SW corner of PAF slab PF1SP2 Center of PAF slab, 11.5 feet N and 8.5 feet E of SW corner of PAF DB1-1SP1 PAF/DSB pad inside corner DB1-ISP2 West edge of DSB pad, 5 feet N of SW corner of DSB pad DB1-1SP3 DSB Pad 22 feet N and 10 feet E of SW corner of DSB DB1-2SPI North edge DSB pad, 50 feet E of NW corner of PAF pad DB1-2SP2 DSB pad 12 feet north and 32 feet E of SW corner of DSB DBI-2SP3 South edge DSB pad, 30 feet E of SW corner of DSB DB5SP1 Carport slab 20 feet N and 45 feet E of Sw corner of DSB pad DB5SP2 East edge carport slab, 30 feet north of SE comer of carport DB5SP3 South edge carport slab, 2 feet W of SE comer of carport slab Samples at outside edges to be in contact with slab edge Attachment 6-41 E900-05-01 5 RZ.

Appendix D Soil Survey Design

ORIGINAL SNEC CALCULATION COVER SHEET CALCULATION DESCRIPTION Calculation Number Revision Number Effective Date Page Number E900-05-014 s/,/a.S 1 of 11 Subject SNEC Plant Area Open Land - OLI - Survey Design Question 1 - Is this calculation defined as fIn QA Scope'? Refer to definition 3.5. Yes l No I Question 2- Is this calculation defined as a 'Design Calculation"? Refer to definitions 3.2 and 3.3. Yes ED No O NOTES: If a 'Yes' answer is obtained for Question 1.the calculation must meet the requirements of the SNEC Facility Decommissioning Quality Assurance Plan. If a 'Yes' answer is obtained for Question 2, the Calculation Originator's Immediate supervisor should not review the calculation as the Technical Reviewer.

DESCRIPTION OF REVISION APPROVAL SIGNATURES  : _--

Calculation Originator W. J. Cooper CHP Date /11e/

Technical Reviewer :5/DateR. Holmes/ 10By Additional Review A. Paynteri Date 2,0JA Additional Review Date

, SNEC CALCULATION SHEET Calculation Number Revision Number Page Number ESOO-05-014 0 Page 2 of 11 Subject SNEC plant area open land - OLI - Survey Design 1.0 PURPOSE 1.1 The purpose of this calculation is to develop a survey design for the Saxton Nuclear Experimental Corporation OL1 SNEC and SSGS open land" areas that are located in the original SNEC facility site and the site of the Saxton Steam Generating Station (SSGS). The area (OL1) is approximately 11600 square meters, including the 1018 square meters in the existing east yard tank excavation. The area is a Class 1 survey area. Because the survey area exceeds the 2000 square meter limitation in Table 5-5 of the SNEC LTP (Reference 3.5) for maximum class 1 open land survey unit area, this survey area is subdivided into multiple survey units.

1.2 Multiple survey units of exposed concrete or macadam: MA8, DB1, PF1, and DB5 will be covered in a separate survey design (E900-05-015). This includes small concrete pads and monoliths, macadam driveways and parking areas, and the remaining pad footprint from the DSF building.

1.3 The OL1-8 area, which consists of the northern portion of the SSGS area is also not included in this design and will be covered by design E900-05-025. About one-third of OL1-8 is covered with a 'PRI pile'. This area is expected to contain both soil/rubble backfill and some residual concrete surfaces. Since layout of this area cannot be completed until the PRI pile is removed, a separate design will be used for the SSGS portion of OLl.

1.4 The Yard Storage Tank Excavation OL1--7 is covered in a separate design (E900-05-012).

1.5 This survey design includes five survey units:

1.5.1 OL1-9, consisting of the 1290 square meter area around and including the CV footprint between the SSGS footprint and the east yard excavation (Attachment 1-3).

1.5.1.1 This area has some exposed concrete NW of the CV.

1.5.1.2A driveway/parking area west of the CV (145 m2) has a thin (about 4 to 6 inches) soil cover. The soil will be surveyed under this design, then removed to expose the pavement, which will then be separately surveyed under design E900-05-015.

1.5.1.3 A portion of OL1 in this vicinity is inside the switchyard (e.g. grid AZ131 and portions of others) and will be surveyed with the switchyard under another design.

1.5.1.4 There is a large 'PRI pile' in the CV area that must be removed prior to survey, so that the as-left soil surface at the CV area can be surveyed as part of OL1-9.

1.5.2 OLl-10 which consists of about 1200 square meters of the SNEC yard (RWST, RWDF, east yard excavation). This area must be surveyed after the east yard excavation is backfilled (Attachment 1-4) so that the as-left soil surface is surveyed.

1.5.3 OL1-11 the barrel bunker area about 1200 square meters (Attachment 1-5).

1.5.4 OL1-12, the line shack surrounding area of about 1575 square meters (Attachment 1-6) not including the line shack itself, which was previously surveyed.

1.5.4.1 Portions of this survey unit are gravel road.

a r-SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-014 0 Page 3 of 11 Subject SNEC plant area open land - OL1 - Survey Design 1.5.4.2 There are a number of small concrete or macadam ramps and sidewalks around the line shack. These paved surfaces will be separately surveyed under design E900-05-015.

1.5.5 OL1-13, an odd shaped perimeter of soil of approximately 1480 square meters around the barrel bunker area and the DSB slab and pavement (Attachment 1-7).

1.6 The general layout of these survey units is shown in Attachment 1-1.

1.7 Fences in and/or bordering the area will be surveyed using a separate design E900-05-023.

2.0

SUMMARY

OF RESULTS The following information should be used to develop a survey request for this survey unit. The effective DCGLw value is listed below. The US NRC has reviewed and concurred with the methodology used to derive these values. See Attachment 2-1 to 2-4. These are copied from Reference 3.10 which was previously approved.

Table 1, DCGLw Values I VolumetricDCGLw(pCl~g-Cs-137) l 5.73 (4.3 A.L.) l NOTE: A.L. is the site Administrative Umit (75% of effective DCGLw) 2.1 Survey Design 2.1.1 Scanning of soil (and fill materials) shall be performed using a 2" D by 2" L Na!

detector with a Cs-137 window setting (Reference 3.1). The window will straddle the Cs-137 662 keV full energy peak width (see typical calibration information on Attachment 3-1).

2.1.2 The instrument conversion factor/efficiency shall not be less than that assumed on Attachment 4-1 as 205.6 cpm/uR/h - Cs-137.

2.1.3 Other instruments of the type specified in Section 2.1.1 above may be used during the final status survey (FSS), but must demonstrate detection efficiencies at or above the value listed in Section 2.1.2 above.

Table 2, Soil Scanning Parameters MDCscan (pCUg) - cs-13r Scan Speed (cmlsec) Maximum Distance from Surface Action Level  % Coverage 6.2 25 4- (gap between detector face & soil surface) > 175 ncpm 100%

See Attachment 4-1*

2.1.4 The action level specified is based on the MDCscan at a 300 cpm background. This is adequate since the MDCscan is expected to be less than the DCGLw times the area factor. Typical observed backgrounds are about 100 to 200 cpm (Attachment 8-3).

2.1.5 If a net count rate greater than the action level of Table 2 is encountered during the scanning process, the surveyor should stop and locate the boundary of the elevated

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-014 0 Page 4 of 11 Subject SNEC plant area open land - 0L1 - Survey Design area. The surveyor should then mark the elevated area with stakes or other appropriate marking methods. Continue the scan survey. Sample the elevated areas(s) IAW SNEC procedure E900-IMP-4520.04 (Reference 3.2), and Section 2.2 of this document following evaluation and investigation survey planning.

2.1.5.1 Class 1 soil should be scanned using a serpentine pattern that is -0.5 meters wide.

2.1.5.2 This is a class 1 survey area. All accessible surfaces are required to be 100%

scanned.

2.1.5.3 There is a large pile of 'PRI' soil in the south-central portion of OL1-9 on the CV cap. This pile should be removed prior to completion of the survey, so that the soils under the pile are subjected to the survey requirements of this design. No residual concrete surfaces are expected to be exposed by removal of this PRI pile.

2.1.5.4The CV soil pile is an established PRI area, and was previously 100% scan surveyed and sampled during an automated conveyor measurement campaign in the summer of 2003 as SR186 and 190 (References 3.15 and 3.16). The results of this survey indicate that the soil pile meets LTP residual activity release requirements and the thoroughness of the survey is adequate to meet FSS measurement needs. One hundred and fifty-seven composite samples were collected of the scanned soil, all of which are less than 25 percent of the AL in this design. Additionally, the automated scanning (see Reference 3.17 for data on a previous scanning campaign) typically achieved an alarm setpoint less than 70% of the AL and detection limits substantially below the alarm setpoints. This soil pile is expected to be used as backfill elsewhere around the plant.

2.1.5.5 Areas that cannot be accessed should be clearly noted along with the reason for not completing the scan in that area.

2.1.6 The minimum number of soil sampling points indicated by the COMPASS computer program (Reference 3.3) is 11 for each of the survey units (see COMPASS output on Attachment 7-4 to 7-8). However, the number of samples is increased to 16 in OLl-13 to provide a more widely distributed layout of sample points in the unusual shape.

2.1.6.1 Sampling depth should be lAW Section 2.2.

2.1.6.2 The MDCscan (soil) exceeds the effective administrative DCGLw for Csl37 (6.2 pCi/g MDCscan @300cpm bkg > 4.3 pCi/g AL) but given the area factor for the assumed 1 meter squared elevated area (AF 28.7) and for the effective sample area (AF > 3), the scan MDC meets MARSSIM requirements.

2.1.7 VSP (Reference 3.4) is used to plot all sampling points on the included diagrams.

The actual number of random start systematically spaced measurement points may

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-014 0 Page 5 of 11 Subject SNEC plant area open land - OLI - Survey Design be greater than that required by the Compass computer code because of any or all of the following:

• placement of the initial random starting point (edge effects),

• odd shaped diagrams, and/or

• coverage concerns (see Attachment 6-3 to 6-12 for VSP sampling point locations) 2.1.8 The starting points for physically locating sample sites in the survey unit are based on measurements from site grid pins or other evident markers (see diagrams on Attachment 6-3, 6-5, 6-7, 6-9, and 6-11). Soil sampling points are positioned using coordinates developed from these markers and listed on Attachments 6-4, 6-6, 6-8, 6-10, and 6-12.

2.1.9 Because of the proximity to the RWDF and drum bunker, a biased sample location (BP-01) is placed in OLl-12 west of the line shack between the line shack wall and the fence.

2.1.10 Because of the potential for residual activity transfer through vehicle movement and post-shutdown topfill on the gravel, two biased samples locations (BP-02 and BP-03) are defined in the gravel areas north and south of the line shack in OL1-12. See note below for sampling process for gravel areas.

2.1.11 A portion of the area of OL1-9 has a layer of old pavement underneath of a thin (4-6 inch) layer of soils. This area is indicated by the darker color on Attachment 6-3. The soil sample in this area should only be collected from the soils on top of the pavement. Cutting down through the pavement to obtain a deeper sample is not required. The soil will be removed after FSS of the soil so that the pavement can be separately surveyed under design E900-05-015.

2.1.12 Some sampling points may need to be adjusted to accommodate obstructions within the survey area. Contact the SR coordinator to report any difficulties encountered when laying out systematic grid sampling points.

2.1.13 When an obstruction is encountered that will not allow collection of a sample, contact the cognizant SR coordinatorforpermission to delete the sampling point.

NOTE If remediation actions are taken as a result of this survey, this survey design must be revised or re-written entirely.

2.2 Sample the biased and random fixed points and any elevated areas(s) LAW SNEC procedure E900-IMP-4520.04 (Reference 3.2) and the following.

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-014 0 Page 6 of 11 Subject SNEC plant area open land - OL1 - Survey Design NOTE Since the site surface dose model is 1 meter in depth, samples representative of the entire one meter thick dose model layer must be collected to satisfy the sampling requirements of Section 2.1.5 (of this document). This should be done by obtaining a well mixed sample of an entire 1 meter deep core. Section 4.2.3, 4.2.6 or 4.2.7 of site procedure E900-IMP-4520.04 are applicable when satisfying Section 2.1.5. Sampling due to an instrument alarm condition should also be of the entire 1 meter of soil/material.

The gravel samples in OLl-12 (including the two biased samples BP-02 and BP-03) should be sampled by collecting two well mixed samples of the layers, one of the gravel overburden layer, and a second of the underlying soil down to a total of 1 meter in depth.

This same process should be used whenever a random point lies on a gravel road or gravel parking area.

For the fixed point soil sample in OL1 -9 over the pavement (FP-1 1), only the soil layer on top of the pavement is to be sampled under this design.

2.2.1 Clearly mark, identify and document all sample locations.,3*

2.2.2 Sample any location that is above the action level cited if Table 2 based on specific investigation plan. n 2.2.3 Maintain chain-of custody requirements on all design fixed point and action level samples (Reference 3.14).

3.0 REFERENCES

3.1 SNEC Calculation No. E900-03-018, "Optimize Window and Threshold Settings for the Detection of Cs-1 37 Using the Ludlum 2350-1 and a 44/10 Nal Detector", 8/7/03.

3.2 SNEC Procedure E900-IMP-4520.04, "Survey Methodology to Support SNEC License Termination".

3.3 COMPASS Computer Program, Version 1.0.0, Oak Ridge Institute for Science and Education.

3.4 Visual Sample Plan, Version 3.0, Copyright 2004, Battelle Memorial Institute.

3.5 SNEC Facility License Termination Plan.

3.6 SNEC Procedure E900-IMP-4500.59, "Final Site Survey Planning and DQA".

3.7 SNEC survey Nal measurements in OLI & OL2 3/8/05 3.8 GPU Nuclear, SNEC Facility, "Site Area Grid Map", SNECRM-020, Sheet 1, Rev 4,1/18/05.

3.9 SNEC Calculation No. E900-03-012, Effective DCGL Worksheet Verification.

3.10 SNEC Calculation No. E900-04-005 "CV Yard Survey Design - North West Side of CV" 3.11 SNEC Procedure E900-IMP-4520.06, 'Survey Unit Inspection in Support of FSS Design".

3.12 NUREG-1575, "Multi-Agency Radiation Survey and Site Investigation Manual", August, 2000.

3.13 Microsoft Excel 97, Microsoft Corporation Inc., SR-1 and SR-2, 1985-1997.

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-014 0 Page 7 of 11 Subject SNEC plant area open land - OLI - Survey Design 3.14 SNEC Procedure E900-ADM-4500.39 Chain of Custody for Samples" 3.15 SNEC survey SR0186 3.16 SNEC survey SR0190 3.17 uFinal ReportforSurvey of Debris Pile", Revision 3 1/4/05 Shonka Research Associates 4.0 ASSUMPTIONS AND BASIC DATA 4.1 The COMPASS computer program is used to calculate the required number of random start systematic samples to be taken in the survey unit (Reference 3.3).

4.2 Scoping and post-remediation soil samples from this area are used as the initial estimate of variability. These results are shown on Attachment 8-1 and 8-2. The grid locations where these samples were taken are shown on Attachment I-1.

4.3 The MARSSIM Sign Test (Reference 3.12) will be applicable for this survey design. No background subtraction will be performed under this criteria during the DQA phase. Normal environmental background of Cs137 will (conservatively) not be subtracted.

4.4 The required number of fixed survey points as determined by COMPASS are then located on the survey map for the survey unit by the Visual Sample Plan (VSP) computer code (Reference 3.4).

4.5 Reference 3.5 and 3.6 were used as guidance during the survey design development phase.

4.6 Background has been measured in the area, and ranges from about 100 cpm to about 200 cpm (Reference 3.7). See Attachment 8-3.

4.7 The determination of the physical extent of this area is based on the drawing Reference 3.8 and numerous walkdowns and measurements.

4.8 Remediation History: OL1 is an open land area. Portions contained the original SNEC site facility and the Saxton Steam Generating Station. Extensive remediation has occurred in the survey area.

4.8.1 The SNEC Radwaste building (RWDF), Control and Auxiliary (C&A) building, Containment Vessel (CV), the SSGS, various buried pipe tunnels and underground tanks were all extensively remediated by removal, various decon methods and extensive concrete removal. The buildings were then demolished to grade or below.

The residual building portions have been previously surveyed and the release surveys have been accepted.

4.8.2 Extensive soil remediation (removal) was performed.

4.8.3 The SSGS was backfilled when it was permanently shut down. Subsequently, activity was found using core bores. The SSGS backfill was removed and surveyed through an automated conveyor system. Additional concrete surfaces in the SSGS basement were remediated and then the scanned backfill was replaced.

4.8.4 The underground tank excavation was backfilled after the tanks were removed early in the project. This backfill was removed. Portions were disposed of as radioactive

A s- SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-014 0 Page 8 of 11 Subject SNEC plant area open land - OL1 - Survey Design waste, while the remainder was scanned using a automated conveyor scanning system and is currently stored for re-use.

4.8.5 The barrel bunker was removed to below grade.

4.8.6 Underground drainage and sewerage systems have been removed.

4.9 This survey design uses Cs-137 as a surrogate for all SNEC facility related radionuclides in the survey unit. The effective DCGLw is the Cs-1 37 DCGLw from the SNEC LTP (6.6 pCi/g) adjusted (lowered) to compensate for the presence (or potential presence) of other SNEC related radionuclides. In addition, an administrative limit (75%) has been set that further lowers the permissible Cs-137 concentration to an effective surrogate DCGLw for this survey area.

4.10 The sample database used to determine the effective radionuclide mix for the CL1 area has been drawn from samples that were assayed at off-site laboratories. This list is shown on Attachment 2-1 through 2-3, and includes twenty-one analysis results. Review of the data shows several radionuclides were not positively identified at any significant concentration.

These radionuclides have been removed from the data set and are not considered further as any minor contribution is accounted for by the administrative reduction of the surrogate DCGLw to 75% of the surrogate DCGLw based on the identified nuclide ratios.

Radionuclides remaining include H-3, Co-60, Sr-90, and Cs-137. Additionally, the data shows Cs-137 to be the predominant radioactive contaminant (based on activity) found in the area.

4.11 The decayed set of sample results were input to the spreadsheet titled "Effective DCGL Calculator for Cs-1 37" (Reference 3.9) to determine the effective volumetric DCGLw values for the CL1 area. The output of this spreadsheet is shown on Attachment 2-4. This data is copied from Reference 3.10.

4.12 The Nal detector scan MDC calculation is determined based on a 25 cm/sec scan rate, a 1.38 index of sensitivity (95% correct detection probability and 60% false positive) and a detector sensitivity of 205.6 cpm/uRlh for Cs-137. Additionally, the detection system incorporates a Cs-137 window that lowers sensitivity to background in the survey unit. The resulting range of background values varies from about 100 to 200 cpm (Attachment 8-3).

4.13 The survey unit described in this survey design was inspected after remediation efforts were shown effective. A copy of the OLI specific portion of the SNEC facility post-remediation inspection report (Reference 3.11) is included as Attachment 9-1.

4.14 No special area characteristics including any additional residual radioactivity (not previously noted during characterization) have been identified in this survey area.

4.15 The decision error for this survey design is 0.05 for the a value and 0.1 for the P value.

4.16 "Special measurements" (as described in the SNEC LTP sec 5.5.3.4) are included in this survey design. Section 5.5.3.4.4 discusses re-fill materials. Portions of this survey will include areas that consist of crushed structural materials and backfill. These will be treated as soil for scanning and sampling.

4.17 No additional sampling will be performed IAW this survey design beyond that described herein.

as o SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-014 0 l Page 9 of 11 Subject SNEC plant area open land - OLI - Survey Design 4.18 SNEC site radionuclides and their individual DCGLw values are listed on Exhibit I of this calculation based on Table 5-1 of Reference 3.5.

4.19 The survey design checklist is listed in Exhibit 2.

4.20 Area factors are shown as part of COMPASS output (see Attachment 7-1) and are based on the Cs-137 area factors from the SNEC LTP.

5.0 CALCULATIONS 5.1 All calculations are performed internal to applicable computer codes or within an Excel (Reference 3.13) spreadsheet.

6.0 APPENDICES 6.1 Attachment 1-1, is a diagram of survey unit OL1. Attachment 1-3 through 1-7 are the grid layouts for the five OLI open land survey units included in this design.

6.2 Attachment 2-1 to 2-4 is the DCGLw calculation logic and sample results from the OL1 and OL2 areas in addition to the DCGL calculation sheets (decayed to January 15, 2004).

6.3 Attachment 3-1, is a copy of the calibration data from typical Nal radiation detection instrumentation that will be used in this survey area.

6.4 Attachment 4-1, is the MDCscan calculation sheet for volumetric materials in pCi/g.

6.5 Attachment 5-1, is the MicroShield dose rate calculation results for 6" thick soil used to determine the exposure rate from a I pCilcm3 Cs-137 source term in a end-cylinder geometry.

6.6 Attachment 6-3 to 6-12, show the randomly picked scan locations (from VSP) and reference coordinates for the five OLI open land survey units included in this design.

6.7 Attachment 7-1 is a COMPASS output showing the area factors used. Attachment 7-2 shows the variability used for all five survey units. Attachments 7-4 through 7-8, are the COMPASS output for the five OL1 open land survey units included in this design, showing the number of sampling points in the survey unit, area factors, and prospective power.

6.8 Attachment 8-1 and 8-2, is the soil variability results from selected recent soil samples from the OL1 area. Attachment 8-3 is the general area Nal detector backgrounds measured on 318105.

6.9 Attachment 9-1, is the results of the inspection report for the OL1 area.

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-014 0 Page 10 of 11 Subject SNEC plant area open land - O1 - Survey Design Exhibit I SNEC Facility Individual Radionuclide DCGL Values (a) 25 mremly Limit 4 mremly Goal 25 mremly Limit (All Pathways) (Drinking Water)

Radionuclide Surface Area Open Land Areas Open Land Areas (b)

(dpml100cm 2 ) (Surface & Subsurface) (Surface & Subsurface)

(pClUg) (pCilg)

Am-241 2.7E+01 9.9 2.3 C-14 3.7E+06 2 5.4 Co-G0 7.1 E+03 3.5 67 Cs-137 2.8E+04 6.6 397 Eu-152 1.3E+04 10.1 1440 H-3 1.2E+08 132 31.1 Ni-63 1.8E+06 747 1.9E+04 Pu-238 3.OE+01 1.8 0.41 Pu-239 2.8E+01 1.6 0.37 Pu-241 8.8E+02 86 19.8 Sr-90 8.7E+03 1.2 0.61 NOTES:

(a)While drinking water DCGLs will be used by SNEC to meet the drinking water 4 mremly goal, only the DCGL values that constitute the 25 mremly regulatory limit will be controlled under this LTP and the NRCs approving license amendment.

(b) Listed values are from the subsurface model. These values are the most conservative values between the two models (i.e.,

surface & subsurface).

SNEC CALCULATION SHEET Calculation Number Revision Number Page Number E900-05-014 0 Page 11 of 11 Subject SNEC plant area open land - OL1 - Survey Design Exhibit 2 Survey Design Checklist Calculation No. Location Codes E900-05-014 SNEC plant area open land - OL1 - Survey Design Status Reviewer ITEM REVIEW FOCUS (Circle One) Initials & Date 1 Has a survey design calculation number been assigned and is a survey design summary At description provided? Cz "a r 2 Are drawngs/diagrams adequate for the subject area (drawings should have compass N/A 2r r w n s d a r m d q a e~ headings)? 4':.l' 3 Are boundaries property identified and is the survey area classification clearly indicated? Nies !A 4 Has the survey area(s) been property divided Into survey units tAW EXHIBIT 10 N/A 5 Are physical characteristics of the areallocation or system documented? Ye NIA 6 Is a remediation effectiveness discussion included? NA Have characterization survey and/or sampling results been converted to units that are . NIA

/J comparable to applicable DCGL values? a5 8 Is survey and/or sampling data that was used for determining survey unit variance included? Y N/A 9 Is a description of the background reference areas (or materials) and their survey and/or Yes sampling results included along with a Justification for their selection?

10 Are applicable survey and/or sampling data that was used to determine variability included? ED NtA 11 Will the condition of the survey area have an impact on the survey design, and has the Yes,(S x X -

probable impact been considered in the design? ' . 4 /.

Has any special area characteristic including any additional residual radioactivity (not 12 previously noted during characterization) been identified along with its impact on survey Yes(G design? ._

13 Are all necessary supporting calculations and/or site procedures referenced or included? es N/A VVOt 14 Has an effective DCGLw been identified for the survey unit(s)?Ye N/A 15 Was the appropriate DCGLEuc included in the survey design calculation? Yes, N/

16 Has the statistical tests that will be used to evaluate the data been identified? e NIA 17 Has an elevated measurement comparison been performed (Class I Area)? Yes,(R) 414 18 Has the decision error levels been identified and are the necessary justifications provided? e N/A 19 Has scan instrumentation been identified along with the assigned scanning methodology?

20 Has the scan rate been identified, and is the MDCscan adequate for the survey design?

21 Are special measurements e.g., in-situ gamma-ray spectroscopy required under this design, ('/A and is the survey methodology, and evaluation methods described?

22 Is survey instrumentation calibration data included and are detection sensitivities adequate? NIA 23 Have the assigned sample and/or measurement locations been clearly identified on a diagram N/A or CAD drawing of the survey area(s) along with their coordinates? N/A )

Aeivsiao eesadadministrative limits adequate, and are any associated actions 24 ~-

24 clearly indicated? i) NIA 25 For sample analysis, have the required MDA values been determined.? Yes,(.

26 Has any special sampling methodology been identified other than provided in Reference 6.3? Yes, NOTE: a copy of this completed form or equivalent, shall be included within the survey design calculation.

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ATTACHMENT 1-7, E900-05-014

DCGL Calculation Logic-CV Yard Soil & Boulders Survey Unit: SNEC Containment Vessel (CV) Yard Soil and Boulders

11.

Description:

The purpose of this calculation is to determine a representative isotopic mix for the CV Yard Soil and associated Boulders from available sample analyses. The effective volumetric DCGLws are then determined from the mean percent of applicable samples.

1ll. Data Selection Logic Tables: The radionuclide selection logic and subsequent DCGL calculations are provided in six (6) tables. These tables were developed using Microsoft Excel. Table explanation is as follows.

Table 1: Data Listing - This table, which has been extracted from a larger database, provides a list of the most representative sample analyses. Results are from scoping, characterization, and pre/post remediation surveys. The samples consist of soil media that was taken in support of the aforementioned surveys. As applicable, a sample number, sample location/description, radionuclide concentration, analysis date are provided for each sample. Positive nuclide concentrations are noted with yellow/shaded background fields while MDA values are noted in the gray shaded fields.

Table 2: Decayed Listing - This table decays the data from Table 1. Half-life values (days) are listed above each respective nuclide column. Samples are decayed from the respective analysis date to January 15, 2004. Positive results are denoted in a yellow background field while MDA values are noted in the gray shaded fields.

Table 3: Decayed Listing of Positive Nuclides & MDAs Removed - This table provides the best overall representation of the data. Non-positive nuclide columns have been removed as well as all the MDA values. Therefore, 11 nuclides have been reduced to four (4).

Table 4: Ratio to Cs-1 37 for Positive Nuclides - This table provides the calculation methodology for determining the surrogate ratio to Cs-137 for each radionuclide. From this information the mean, sigma, and mean % of total are calculated. The mean % of total values is used to calculate the volumetric DCGLW per MARSSIM equation 1-14. See Table 5. Note that the mean percent values were averaged using only the positive sample results in each column. In some cases only a single nuclide value (e.g. Sr-90) had a positive result. This value is listed as the value in the mean result field. This results in higher "mean percent of total' values in the mix, which are conservative.

Note: From Table 4 only the "mean % of total" values are used as input to the "Effective DCGL Calculation Spreadsheet" as illustrated in Table 5.

Table 5: Effective DCGL Calculator for Cs-1 37 (in pCi/g) - This table provides the surrogate volumetric modified Cs-137 DCGL, calculation results from data derived from Table 4.

IV. Summary - Since the CV Yard and Boulders are volumes of soil or rock material, existing in place or in a pile, the release limit is primarily based on the volumetric DCGLw. Using the above data selection logic tables the calculated Cs-137 volumetric DCGLw is 5.73 pCi/g. This value will be reduced by 25% as part of SNEC's requirement to apply an administrative limit as discussed in the License Termination Plan (LTP).

Attachment 2-1 E900-05-014 1

TABLE 1 . Data Listing (pCUg)

Pu-241 C441 "1.8 Eu-IS?

CVTuonel CV Tunnel SedimentComposile, O1 4R4Eu0 .3E0 4.02E.0 I 1.30E-01 SXOSL.0211S Suasuface SampleP29 5.'), AY-12 01 OC1 5551.11062 north CV Yard SIl 8A.127.12' El. Sample 5,01.2 3.TTE.0

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- - l

• 1I _

I 4,99E.0 SAW-0 2KE42 2.M26E1 11A9E.01 &56E402 71.21E.2 I 3.55E00 231-1 .8E0 9.89E.2 SXS1132 lorth CVYard Soil AZ.13t0,Smple 99S.O1 2.98E.0 1.15E.02 259E.00 1 5.27E.00 .1.0 1.206E01 7.34E.02 SXSL1270 I 3.001E.02 2.1OEa.0 . 0 0.606.0 7.00-02 1.9IE.0 000 0 7.E6.0 4.OE0 3,14E.02 6.OOE.01 1.OE.00I 17E0 I.3.1 5.6E.01 SXSi.2N72 IL ._ AM41-O Is SXSL3140 Ealt CVYard. Soil Pilei ' o iDepth),01.1 1A9E9or 120E.02 I .0E0-2 8.25E.1 -7OOE03 5 E0-03 5&OE.03 I 3.69E-01 8.6GE-02 31E* .0.2 1S SXSI.3142 Sdl Pile, CV Yard, Three Fect onSEut Side, SRJ37,O1.1 2.95E42 I? SXS1.3146 Eat CVYard. Soil Pile 3M'onEast Sidt (' Septh),01.1 iS SXSL1.240 Soil Pie, CV Yard,Six Feeton Etst Side, SR-37,01.1 :w1 19 SXS1.192 East CVYard, Soil Pile p Top 16"DSepth).O1 21 22 23 SXSS14`42 SXS1.4143 SXSL.4149 CVYard Sodl- inat Side.API-7, O1.

CV Yard Soil. est Side,API-7. 01.

CV Yard Soil eastSide,APIt.7 OEI 213Eu00 224E.00 I

I 3.OE.02 2.M1E42

= K-3::::: i ;i 7.006.02I 3.9i-E+oOI 2.IE M2 6.71E.02I 6.31E42 3.4E402 4.30E.02I 3.04E.02 ABLE 2 - DEtayed Lsting (pCIvg I T1 2 TII2 T 1Q2 T12 T12 T112I T 1,2 T ,2 T 12 T112 T 12 1 Oay Dxat 4485.27 32050.6875 9-3 Pu-238 ET (d) i 5C n~.... O 1.STEh0 9.OIE.00 I 8.5901 5.37E.1 I

1.0

= [1.10E.01 22E4t1 l 3.88E.01] 9.34E+( 1 3;94E. l 1.12E February14,2001 1065 SubsuaaceSample029 (06S, AY-129,OL1 SXOS1.109 I November17,f99 1520 North CV Yard Soll 9A412T,812 El, Sample S0,01.2 June27,2002 567 SXSLID", i North CV Yard Soil AY.127,810'El, Sample 3,OL1 June2, 2002 566 Nor1hCV Yard Soil AY.12. 804' El, Sample 2,01.1 Junte29,202 565 No.1hCVYard Soil AY.12, 79tr El, Sample;?201.1 June29,2802 565 North CV Yard Soil AX129, 803tE. Sample 4,0L1 6.24E-02 2.44E8.2 2.11-001 I 1tAIIE 846E42 I 121E.02 3A30E.00 I 2 31EAO July3,2002 561 It37 tinro "I -~r Sni 7.1111 Sam- :6 r z 2 73E A tt2A' 7 gEap 7 7 NW1F.Ud I UE01 T37, M U AP6A7 4HM.f 11FJl ISM-hiA1 I ?M7.111 11.

S 4 1. 4 * S '-J..Z5..ZLl..+/-L0kZ-...4 July3,2002 561 00011270 AX123, 3-1 Soil, CV SESide ' From CV SO El.,OL5 7.T2203 2.1E8.01 369E42 6.86E-03 7.006.03 1.087E+00 I 393E.00 153m.0o 6.1 7E02 SXSL1I281 AX 12S,31. Soil,CV Tunnel Ent 6' From CV, 801El, O1.

1r7E42 July29,2001 903 July 2S,2001 903 11 SXSL.2494 Anulus Well,A.2,8 to 10' Dopt, 01. Fehruary13,2002 701 SXS128?1 CV Area- EastYard Din Pile. Middle, 102fay Up. 011 March .2002 114 SXS1.272 V Area - EastYard DtinPilO- Bottom talco top certerl, 01 March6 2002 Is SXt 013140 ESotCV Yard,Soil Pile a ' on Sest Side 1S'Depthl, O0 _ .958 -5 '.01j 8I6 SAM2 I August 30.2002 SXS1.212 Soil Pile, CV Yard,Three Feel on Eact Side, SR37,OL1 2JM5842 5.8?E2 StE4-01 August 13,20022 520 17 SXSSL3146 EactCVYard. Soil Pile @2 uonEtastSide ($- Depth, OL0 t 1.76E-0 1 1.6-02 1.080E42 1.22E- 1 3.99EJ3 1 4.9503 5.00303 352E01l 8 38-02 3.65E-0o 3Sf42 August 30,2092_ 503 18 SXS1.3140 Soil Pile, CVYard, SixFeet on Eat Side, SR4T7, OL1 2.7E42 6J3I-02 2.9QF-01 August13 20922 520 19= Eut CVYard, soil Pile p Top (t Depth). 01. .00 4i7E-02 August 30.2002 _503 21 00X1.4142 22 23 KEY I IYellow Shaded Background - Positive Result Gray Shaded Background = MDA 2

CO

TABLE 3 - Decayed Listing of Positive Nuclides & MDAs Removed (pClg)

C SNECSample No LocationeDescription H-3 Sr-90 Co-60 Cs-137 Total pCog I CV Tunnel CV Tunnel Sediment Composite, OL 9.01 E+00 8.59E-01 1.ITE+03 1178.89 2 SX9SL99219 Subsuface Sample :29 (0-6'), AY-128, OL1 5.36E.01 0.54 3 SXSLI063 North CV Yard SoIl 8A-127, 812' El, Sample:5, 01.2 4.20E-00 8.5i.01 5.05 4 SXSLIO9 North CV Yard Soil AY-127, 810' El, Sample

• 3, OL1 2.78E+00 1.24E+00 4.02 S SXSLIII North CV Yard Soil AY-128, 804' El, Sample 0 2, OL 4.47E400 1.74E4O0 6.21 8 SXSL1122 North CV Yard Soil AY-129, 758' El, Sample

• 2, OLI 3.15E+00 4.6OE+00 7.76 7 SXSL1130 North CV Yard Soil AX-129. 803' El, Sample

• 4, OL1 4.58E.00 2.44E-02 2.16E01 26.42 8 SXSL1132 North CV Yard Soil AZ-130, Sample t 5, OLI 2.73E-0 2.50E+00 5.23 9 SXSL1270 AX-129, 3-3, Soil, CV SESide 5' From CV, 800' El., OL1 s2.IE+01 21.82 10 SXSL1281 AX-128, 3-1, Soil, CV Tunnel East S From CV. 800' El, OL1 4.14E+00 4.14 11 SXSL2649 Anulus Well, A-2, 6 to 10 Depth, OL1 5.74E.01 0.57 13 SXSL2871 CV Area - East Yard Dirt Pile - Middle, 12 Way Up, 0O1 5.37E-01 0.64 14 SXSL2872 CV Area - East Yard Dirt Pile - Bottom (also top center), OL1 9.58E.02 .10 16 SXSL3140 East CV Yard, Soil Pile a 6 on West Side (6 Depth), 011 7.99E01 0.80 16 SXSL3142 Soil Pile, CV Yard, Three Feet on East Side, SR-37,OL1 5.81E41 0.68 17 SXSL3145 East CV Yard, Soil Pile 3' on East Side (68 Depth), OL1 1.22E+00 1.22 18 SXSL3149 Soil Pile, CV Yard, Six Feet on East Side, SR-37, OL1 _ 2.90E401 0.29 19 SXSL3153 East CV Yard, Soil Pile a Top (68 Depth), OL1 2.91E-01 0.29 21 SXSL4142 CV Yard Soil - West Side, AP1-7, OL1 8.94E-01 0.89 22 SXSL4143 CV Yard Soil - West Side. API-7, OL1 4.97E-01 o.s0 23 SXSU4149 CV Yard Soil - West Side, API-7, 011 I 6.74E-02 3.87E+00 3.84 TABLE 4 - Ratio To Cs-137 for Posiive Nuclides StHECSampletlo Locatlon'Description H-3 Sr-90 Co-60 Cs-137 Total I CV Tunnel CV Tunnel Sediment Composite, OL1 7.71E03 7.35E-04 1.OOE+00 1.01 2 SX95L99219 Subsuface Sample #29 (0-8'), AY-128, OL1 I.00E4-0O 1.00 3 SXSL1063 tlorth CV Yard Soil BA-127, 812 El, Sample #5, 012 4.91E*00 1.00E+OO 8.91 4 SXSL1089 tlorth CV Yard Soil AY-127, 810' El, Sample 0 3, OLI 2.23E+00 1.0OE 00 3.23 S SXSL1116 North CV Yard Soil AY-128. 804' El. Sample 02. OLI 2.57E+00 1.OOE.00 3.87 6 SXSL1122 llorth CV Yard Soil AY-129, 798' El. Sample s 2, OL1 6.85E401 1.OOEI 1i.68 7 SXSL1130 North CVYard Soll AX-129, 803EI,Sample s4, OL1 2.10E-01 1.12E403 1.OOE+OO 1.21 8 SXSL1132 North CV Yard Soil A2Z-130,Sample 08,011 16.O9EL 1.OOE+00 2.9 9 SXSL1270 AX-129, 3-3, Sol, CV SESide S From CV.800' El., OL1 1.00E+00 1.00 10 SXSL1281 AX-128, 3-1, Soil, CV Tunnel East 8 From CV, 800' E, OL1 1.00E400 1.00 II SXSL2649 Anulus Well, A-2, S to 10'Depth, OL1 1.OOEa00 1.00 13 SXSL2871 CV Area - East Yard Dirt Pile - Middle, V2 Way Up, OL1 1.OOE+00 1.00 14 SXSL2872 CV Area - East Yard Dirt Pile - Bottom (also top center). 0L1 1.00E+00 1.00 15 SXSL3140 East CV Yard, Soil Pile 6' on West Side (68 Depth), OL1 t.OOE400 1.00 16 SXSL3142 Soil Pile, CV Yard, Three Feet on East Side, SR-37,011 1.00E+00 1.00 17 SXSL3146 East CV Yard, Soil Pile i 3' on East Side (6" Depth), OL1 1.0E+00 1.00 It SXSL3149 Soil Pile. CV Yard, Six Feet on East Side, SR-37,OLI 1.OE*00 1.00 19 SXSL3153 East CV Yard, Soil Pile @ Top (68Depth), OL1 1.04E+00 1o00 21 SXSU4142 CV Yard Soil - West Side, API-7, 011 1.OOE+00 1.00 22 SXSU143 CV Yard Soi - West Side, API-7, 01 1.OOE+00 1.00 23 SXS149 CV Yard Soil - West Side, AP1-7.011

-I__ ___ 1.74E42 1.0E+00 1.02 Nlean=: 1.95E-00 I 7.71E.03 1 6.42F.03 1 2.96 Sigma=*

I - Ii i . - I ~u 1....I1.-- U.U1U

- .- I ..

M~ean %, of Total:: 65.79% 0.26% 0.22% 33.74% 100.00%

A A J a 3

ca2-

Table 5 I SIIEC AL. 75%e l Total Activity Limit DCGLv. .. AdmlnisirtiLve Limit Effective DCGL Calculator for Cs 137 (In pCI!g) 1 16.98 IpC11g 1 12.74 JpCilg I SAMPLE IIUt.M8ER(s3lC.'? YARD SOIL & BOULCER SAtPLES I I .I LUmit

-c1137  :. 1.Ci.!37 AdrmlnlitriWv~Limit 17.45. 25.0 mremry- TEDE Limit 1 5.73 CII)g 1 4.30 IC110 P Che.*. for 25nit en.

7.79% 4.0 rnrem-y Drinking Water (DI'0W Limit . .

Sample Inrut

(:Ci g. uCi. I: 23 mrem.y TECE 4 mremy OD A - Allowed pCi:g for B *Allowed pCtig Value Checked from This Samrlle This Sample Isotope of TojiI. etc.) t o Total Limits (rCI-g) Limit; (pCI;g) 25 mremnv TECE for 4 mremV DOW Coiumn A or B mremni; TEDE mrem4' DW Ain-241 0 000% 9.9 2* °0 0 0 00 0 00 0 00 0.00 . Am.241 C.14 0 00% 2.0 .5:4 000 A P90' -, 000 0 00 0.00 C.14 Co.60 o.00o34 0 219?% 3.5 6700 04 00 0i 04 0 0j O00 Co.60 Cs.137 1.0000 33 733% 6.6 397 3 .3 5.73 3 79 0.01 Cs.137 6 Eut152 0 000% 10.1 1440 0 00 Ad 0 90 0 00 O00 0.00

• Eu.152 H.3 1.9499 r5 736% 132 311 1117 . 25.02 11 17 0 37 0.25 H 3 11i.63 00300% 747 19000 0Q. 0 00 OO 0.00 . II-l63 Pll.238 0 O00% 1.8 - -

0.41- r- 0 00

• j; .00. 0 00 0 00 0. . P11.238 If .0.00 Pu.239 Ptu-239 0 000% 1.6 0:370';00 0 0 00 0 00 ..

Pui.241 0 000% 86  ; 198 0 00 0 0n 0.00 Pu.241 PI I Sr.90 0.0077 0 260%' 1.2 0.61 0 04 0 10 0 04 0 16 . 0.05 Sr.90 2.96E400 100.000'. 16.98 38.03 16.98 4.364 0.312 DC . _ . .

I I Maximum Permissible Maximum To Use This Information, pCi-g Permissible pCi'g Sample Input Units Must Be In (25 mremrnV) (4 mrem-'y) l)C!1q lot %*o1 Total.

IJ tj m

(0 0

0 001 0

4

2350 INSTRUMENT AND PROBE EFFICIENCY CHART 7/01/04 (Typical 2" by 2" Nal (Cs-137 W) Conversion Factors)

Inst.' Cal Due AP Probe m Cal Due cpm/mRJh 986256 s12 (i' R& Y 2 1680 KP ! 5.'185 21 l 214.8I2 986476 5/175 I 3 &Y ___ 21 1667 Pk ___ ___ _ 1_2 U__ _S_

_ _ _ _ _ _ __ __-_ I _ __

129423 1 i P[&Y.

8118(J0 1 21687 Pk 5 '/IXiOSi05 21S I117 I 8I05 LK i573

_____ 21 1674Pk I 51t105 .2I2.173 I __ I _ _ l _ I _ __ I __ I ___

I 17'566 4/9/05 l G&R l_ _ l Is52 Pk l 4/13/05 209-862

_ _ I _ _ I _ _ I __ I _ _ _ I __ I _ _ _ _

1261 83 I 11/9/04 [3&R _ 20628() Pk I 12/12/04 I 190,907

__I __I __I ___ __ 1____

1"2942l 1 1.3/)04 Y&,W l_ l 206283 Pk 10/31/04 j 177185 12'6198 1I `03/04 I&- ___ j__1(602)1 Pk 5/25/05 209). 19I 1____ __- 196022' 6/07/05 j 208.302

__ l _ _ _ _ _ I *. L I __ _ i 129'4(40 4/09/05 l)&W l_ l 210938 Pk I 4/14/05 205.60h 120)88 l 6/008/05 1_&_ I [185844 Pk l 6/09/05 l 216.654 66 o.

.1.

_ II -

ILŽ/8/05 l.nvS 21 ~7 9(,t)t

______6___0_21___

Attachment 3-1 E900-05-014

Nal Scan MDC Calculation I MDCscan = 6.2 pCi / g b background in counts per minute bi = background counts in observation interval Conv = Nal Detector / meter calibrated response in cpm/uRlhr d = Index of sensitivity from MARSSIM Table 6.5 based on 95% detection, 60% false positive HSd = Elevated measurement spot diameter in centimeters MDCscan = MinimumDetectable Concentration for scanning in pCilg MDCRi = Minimum Detectable Count Rate in net counts per minute MDCRsurv = MDCRi adjusted for the human performance factor p - in net counts per minute MDER = Minimum Detectable Exposure Rate in uR / hr MSoutput = MicroShield derived exposure rate for 1 pCilg contaminant in mR/hr 01 = Observation interval in seconds p = human performance adjustment factor - unitless SR = Scanning movement rate in centimeters per second DCGLeq = Net count rate equivalent to the Adjusted DCGL b= 300 cpm p= 0.5 HSd = 56 cm SR = 25 cm d= 1.38 Conv = i 205.6 1cpm/uRlhr Msoutput = 1.37E-04 lmR/hr I pCi/g DCGL = 4.3 pCi/g HSd = 2.24 = Oi (sec) b*Oi = 11.2 = bi (counts)

SR 60 (sec/min) d*sqrt(bi)*60 = 123.7 = MDCRi (net counts per minute)

Oi MDCRi = 174.9 = MDCRsurv (net counts per minute) sqrt(p)

MDCRsurveyor = 0.851 = MDER (uR/hr)

Conv MDER = 6.21 = MDCscan pCi/g MSoutput*1 000(uR/mR)

MDCsurv*DCGL = 121 = AL net cpm MDCscan Attachment 4-1 E900-05-014

MicroShield v5.15 (5.115-001 21) -t GPU Nuclear Page :1 File Ref:

DOS File : MODEL.MS5 Dale:

/ Rim Dale : September 23 2003 BC i

Rimn line : 243.26 PIAl Checked D 00.00.02 n:ation Case

Title:

Cs-1 37 Soil

Description:

Model for Scanning Geometry: 0 - Cylinder Volume - End Shields Source Dimensions

'Feighl 15.24 cm 6.1in Radius 28.0cm 11.0in Dose Points A l X I Y I z t1 0 cm 25.4 cm a cm 0.Oin lO.Oin O.Oin Shields Shield Name l Dimension l Matedial l Densily Source 3.75e104 crm' Concrete 1.6 Ai Gap Air 0.00122 Snurce Inptit Grouping Method : Actual Photon Energies Ihucrde curies l becqterels l :lCicm I Ba/cm' Ba.137m 5.6015eO000 2.1022etf03 1.5136e006 5 6003e-002 Cs-137 6.0050e-000 22221e4003 1.6000e*006 5.9200e-002

£1) Builtdllp

=r The material reterence Is: Source 3

CD Integration Parameters Radal 50 Circumferenlial 50 Y Direction laxiat 50 m

CD Results EneVgy pActiityd Fluence Rate MeV/cr'/tec Floence Rate MeVlcrri/seo Exposure mR/Ah Rate Exposute mR/hiRalte 0

0 photons/sec to Buildup HeV With BilAdup No Buildup With Buildup 0

0 0.0318 4.352eo01 7.617et06 9.220e06 6.345e08 7.690e-00 0.0322 9 030e01 1.465e-05 1.734e 05 1.179e 07 1.436e*07 00364 2.922e+01 O.ll0e-06 1.060e-05 4.613e-08 6.024e00 0.6616 1.892e403 7.060e-02 1.260e-01 1.369e 04 2.443e*04 TOTALS: 2.045e*03 7.063e-02 1.261e-01 1.371e-04 2446e*04

LEFT INTENTIONALLY BLANK Attachment 6-1 E900-05-014

LEFT INTENTIONALLY BLANK Attachment 6-2 E900-05-014

OLI-9 Open Land CV Area I

I N

Origin Pin AX131 Attachment 6-3 E900-05-014

OLI-9 Fixed point Dimensions in METERS X Coord Y Coord Label Grid Type East North 20.63 3.52 FP-1 AX129 Systematic 0.6 3.5 32.27 3.52 FP-2 AX128 Systematic 2.3 3.5 43.91 3.52 FP-3 AX127 Systematic 3.9 3.5 14.81 13.60 FP-4 AY130 Systematic 4.8 3.6 26.45 13.60 FP-5 AY129 Systematic 6.5 3.6 38.09 13.60 FP-6 AY128 Systematic 8.1 3.6 49.73 13.60 FP-7 AY127 Systematic 9.7 3.6 20.63 23.68 FP-8 AZ129 Systematic 0.6 3.7 32.27 23.68 FP-9 AZ128 Systematic 2.3 3.7 43.91 23.68 FP-10 AZ127 Systematic 3.9 3.7 4.27 11.72 FP-11 AY131 Systematic 4.3 1.7 OL1-9 Fixed point Dimensions in FEET X Coord Y Coord Label Grid Type East North 67.67 11.55 FP-1 AX129 Systematic 2.1 11.5 105.85 11.55 FP-2 AX128 Systematic 7.5 11.5 144.03 11.55 FP-3 AX127 Systematic 12.8 11.5 48.59 44.61 FP-4 AY130 Systematic 15.8 11.8 86.76 44.61 FP-5 AY129 Systematic 21.2 11.8 124.94 44.61 FP-6 AY128 Systematic 26.5 11.8 163.11 44.61 FP-7 AY127 Systematic 31.9 11.8 67.67 77.67 FP-8 AZ129 Systematic 2.1 12.1 105.85 77.67 FP-9 AZ128 Systematic 7.5 12.1 144.03 77.67 FP-10 AZ127 Systematic 12.8 12.1 14.00 38.44 FP-11 AY131 Systematic 14.0 5.6 Xcoord and Ycoord values are from the origin pin AX131 East and North are from each grid ID pin Attachment 6-4 E900-05-014

OLl-10 SNEC Yard after backill N

'P P-F-1PI F7P-1 FP P Origin Pin AX126 Attachment 6-5 E900-05-014

OLl-10 Fixed point Dimensions in METERS X Coord Y Coord Label GRID Type East North 2.87 3.64 FP-1 AX126 Systematic 2.87 3.64 14.09 3.64 FP-2 Ax125 Systematic 4.09 3.64 25.32 3.64 FP-3 Ax124 Systematic 5.32 3.64 36.54 3.64 FP-4 Ax123 Systematic 6.54 3.64 8.48 13.36 FP-5 AY126 Systematic 8.48 3.36 19.70 13.36 FP-6 AY125 Systematic 9.70 3.36 30.93 13.36 FP-7 AY123 Systematic 0.93 3.36 2.87 23.08 FP-8 AZ126 Systematic 2.87 3.08 14.09 23.08 FP-9 AZ125 Systematic 4.09 3.08 25.32 23.08 FP-10 AZ124 Systematic 5.32 3.08 36.54 23.08 FP-11 AZ123 Systematic 6.54 3.08 OL1 -10 Fixed point Dimensions in FEET X Coord Y Coord Label GRID Type East North 9.41 11.95 FP-01 AX126 Systematic 9.4 12.0 46.22 11.95 FP-02 Ax125 Systematic 13.4 12.0 83.04 11.95 FP-03 Ax124 Systematic 17.4 12.0 119.85 11.95 FP-04 Ax123 Systematic 21.4 12.0 27.82 43.83 FP-05 AY126 Systematic 27.8 11.0 64.63 43.83 FP-06 AY125 Systematic 31.8 11.0 101.44 43.83 FP-07 AY123 Systematic 3.0 11.0 9.41 75.71 FP-08 AZ126 Systematic 9.4 10.1 46.22 75.71 FP-09 AZ125 Systematic 13.4 10.1 83.04 75.71 FP-10 AZ124 Systematic 17.4 10.1 119.85 75.71 FP-11 AZ123 Systematic 21.4 10.1 Xcoord and Ycoord values are from the origin pin AX126 East and North are from each grid ID pin Attachment 6-6 E900-05-01 4

OLl-11 Barrel Bunker Area N

Origin Pin AU 126 Attachment 6-7 E900-05-014

O1-11 sample dimensions in METERS X Coord Y Coord Label Grid Type East North 2.50 6.95 FP-1 AU126 Systematic 2.5 7.0 13.72 6.95 FP-2 AU125 Systematic 3.7 7.0 24.95 6.95 FP-3 AU124 Systematic 4.9 7.0 36.17 6.95 FP-4 AU123 Systematic 6.2 7.0 8.11 16.67 FP-5 AV126 Systematic 8.1 6.7 19.33 16.67 FP-6 AV125 Systematic 9.3 6.7 30.56 16.67 FP-7 AV123 Systematic 0.6 6.7 2.50 26.39 FP-8 AW126 Systematic 2.5 6.4 13.72 26.39 FP-9 AW125 Systematic 3.7 6.4 24.95 26.39 FP-10 AW124 Systematic 4.9 6.4 36.17 26.39 FP-11 AW123 Systematic 6.2 6.4 OL1-1 1 Fixed point Dimensions in FEET X Coord Y Coord Label Grid Type East North 8.20 22.80 FP-1 AU126 Systematic 8.2 22.8 45.01 22.80 FP-2 AU125 Systematic 12.2 22.8 81.82 22.80 FP-3 AU124 Systematic 16.2 22.8 118.64 22.80 FP-4 AU123 Systematic 20.2 22.8 26.60 54.68 FP-5 AV126 Systematic 26.6 21.9 63.42 54.68 FP-6 AV125 Systematic 30.6 21.9 100.23 54.68 FP-7 AV123 Systematic 1.8 21.9 8.20 86.56 FP-8 AW126 Systematic 8.2 21.0 45.01 86.56 FP-9 AW125 Systematic 12.2 21.0 81.82 86.56 FP-10 AW124 Systematic 16.2 21.0 118.64 86.56 FP-1 I AW123 Systematic 20.2 21.0 Xcoord and Ycoord values are from the origin pin AU126 East and North are from each grid ID pin Attachment 6-8 E900-05-014

OLl-12 Line Shack Surrounding Area FP FP

- .: BP-03 NT--

T Origin Pin AT122 Attachment 6-9 E900-05-014

OLl-12 Fixed point Dimensions in METERS X Coord Y Coord Label Grid Type East North 7.03 7.00 FP-1 AT122 Systematic 7.0 7.0 19.87 7.00 FP-2 AT121 Systematic 9.9 7.0 0.60 18.12 FP-3 AU122 Systematic 0.6 8.1 13.45 18.12 FP-4 AU121 Systematic 3.4 8.1 26.29 18.12 FP-5 AU120 Systematic 6.3 8.1 0.60 40.37 FP-6 AX122 Systematic 0.6 0.4 26.29 40.37 FP-7 AX120 Systematic 6.3 0.4 7.03 51.50 FP-8 AY122 Systematic 7.0 1.5 19.87 51.50 FP-9 AY121 Systematic 9.9 1.5 0.60 62.62 FP-10 AZ122 Systematic 0.6 2.6 13.45 62.62 FP-11 AZ121 Systematic 3.4 2.6 0.40 34.00 BP-01 AW122 Biased 0.4 4 15.00 45.00 BP-02 AX121 Biased 5 5 5.00 5.00 BP-03 AT122 Biased 5 5 OLI-12 Fixed point Dimensions in FEET X Coord Y Coord Label Grid Type East North 23.05 22.96 FP-1 AT122 Systematic 23.0 23.0 65.18 22.96 FP-2 AT121 Systematic 32.4 23.0 1.98 59.45 FP-3 AU122 Systematic 2.0 26.6 44.11 59.45 FP-4 AU121 Systematic 11.3 26.6 86.25 59.45 FP-5 AU120 Systematic 20.6 26.6 1.98 132.42 FP-6 AX122 Systematic 2.0 1.2 86.25 132.42 FP-7 AX120 Systematic 20.6 1.2 23.05 168.91 FP-8 AY122 Systematic 23.0 4.9 65.18 168.91 FP-9 AY121 Systematic 32.4 4.9 1.98 205.40 FP-10 AZ122 Systematic 2.0 8.6 44.11 205.40 FP-11 AZI21 Systematic 11.3 8.6 1.31 111.52 BP-01 AW122 Biased 1.3 13.1 49.20 147.60 BP-02 AX121 Biased 16.4 16.4 16.40 16.40 BP-03 AT122 Biased 16.4 16.4 Xcoord and Ycoord values are from the origin pin AT122 East and North are from each grid ID pin Attachment 6-1 0 E900-05-01 4

OLI-13 South and West SNEC Yard Perimeter r N w

0 3

(D M

0) Old Macadam Parking lot CD m

0 O .......

0 0

091

\Origin Pin ATI 31

OLl-13 Fixed point Dimensions in METERS X Coord Y Coord Label Grid Type East North 17.10 4.53 FP-1 AT130 Systematic 7.1 4.5 27.44 4.53 FP-2 AT129 Systematic 7.4 4.5 37.78 4.53 FP-3 AT128 Systematic 7.8 4.5 48.12 4.53 FP-4 AT127 Systematic 8.1 4.5 58.46 4.53 FP-5 AT126 Systematic 8.5 4.5 68.80 4.53 FP-6 AT125 Systematic 8.8 4.5 79.14 4.53 FP-7 AT124 Systematic 9.1 4.5 89.48 4.53 FP-8 AT123 Systematic 9.5 4.5 1.59 13.48 FP-9 AU131 Systematic 1.6 3.5 17.10 22.43 FP-10 AV130 Systematic 7.1 2.4 11.93 31.39 FP-11 AW130 Systematic 1.9 1.4 41.04 21.37 FP-12 AV127 Systematic 1.0 1.4 46.21 30.32 FP-13 AW127 Systematic 6.2 0.3 20.36 39.28 FP-14 AW129 Systematic 0.4 9.3 30.70 39.28 FP-15 AW128 Systematic 0.7 9.3 41.04 39.28 FP-16 AW127 Systematic 1.0 9.3 OLl-13 Fixed point Dimensions in FEET X Coord Y Coord Label Grid Type East North 56.09 14.84 FP-1 AT130 Systematic 23.3 14.8 90.00 14.84 FP-2 AT129 Systematic 24.4 14.8 123.92 14.84 FP-3 AT128 Systematic 25.5 14.8 157.83 14.84 FP-4 AT127 Systematic 26.6 14.8 191.75 14.84 FP-5 AT126 Systematic 27.7 14.8 225.66 14.84 FP-6 AT125 Systematic 28.9 14.8 259.58 14.84 FP-7 AT124 Systematic 30.0 14.8 293.49 14.84 FP-8 AT123 Systematic 31.1 14.8 5.21 44.22 FP-9 AU131 Systematic 5.2 11.4 56.09 73.59 FP-10 AV130 Systematic 23.3 8.0 39.13 102.96 FP-11 AW130 Systematic 6.3 4.6 134.60 70.09 FP-12 AV127 Systematic 3.4 4.5 151.56 99.46 FP-13 AW127 Systematic 20.4 1.1 66.77 128.83 FP-14 AW129 Systematic 1.2 30.4 100.68 128.83 FP-15 AW128 Systematic 2.3 30.4 134.60 128.83 FP-16 AW127 Systematic 3.4 30.4 Xcoord and Ycoord values are from the origin pin AT1 31 East and North are from each grid ID pin Attachment 6-12 E900-05-014

Site Report Site Summary Site Name: SSGS and SNEC Open land Planner(s): WJCooper Contaminant Summary NOTE: Surface soil DCGLw units are pCig.

Building surface DCGLw units are dpml1DO cm2.

Screening Contaminant Type DCGLw Value Used? Area (ml) Area Factor Cs-137 Surface Soil 4.30 No 400 3 100 3.6 25 4.7 1 28.7 Attachment 7-1 E900-05-014 60OMPASS v1.0.0 31312005 Page 1

-I-!

Surface Soil Survey Plan Contaminant Summary SSGS and SNEC Open Land OLI DCGLw Inferred Modified DCGLw Scan MDC Contaminant (pCWg) Contaminant Ratio (pClIg) (pCUg)

Cs-137 4.30 NIA NWA NIA 6.2 Survey Unit Estimate Reference Area Estimate (Mean t 1-Sigma) (Mean +/- 1-Sigma)

Contaminant (pCUg) (pCUg)

Cs-137 0.32 i 0.3 NIA Attachment 7-9 F900-05-014 COMtPASS v1.0.0 312312005 Page 2

LEFTINTENTIONALLY BLANK Attachment 7-3 E900-05-014

Surface Soil Survey Plan Survey Plan Summary Site: SSGS ar id SNEC Open land Planner(s): WJCoop er Survey Unit Name: Open Land ARea CV OL1-9 Comments:

Area (m2 ): 1:2, Iq0 Classification: 1 Selected Test: Sign '--';7-v 3 lc5- Estimated Sigma (pCi/g): 0.3 DCGL (pCi/g): 4.30 Sample Size (N): 11 LBGR (pCi/g): 3.4 Estimated Conc. (pCi/g): 0.3 Alpha: 0.050 Estimated Power 1 Beta: 0.100 EMC Sample Size (N): 11 Scanning Instrumentation: Nal Prospective Power Curve

_ 0.8 C 4---

- 0.7 r 0.6 I-I---

• 0.5 '-1-__ ___ __

I I

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_ 0.4 . = l_= =-_ e _

. -= I77_

.2 03 I.I z =

0.2 .  : s=

02~

.- 4, _

Z 0.1 =<f=X: - -

Ir O 0.0 0.5 1.0 15 2.0 2.5 3.0 3.5 4.0 4.5 S.0 Soil Concention (pCifg), cluaing background

- Power - DCGL - - Estimated Power

- LsGR I 1Aftlchment 7-4 E900-05-014 411312005 Page 1 vl.0.O COMPASS v1.0.0 4J1312005 Page I

Surface Soil Survey Plan Survey Plan Summary Site: SSGS and SNEC Open land Planner(s): WJCooper Survey Unit Name: SNEC Yard Excavation After Backfill OLl-10 Comments:

Area (m2): 1,200 Classification: I Selected Test: Sign Estimated Sigma (pCi/g): 0.3 DCGL (pCi/g): 4.30 Sample Size (N): 11 LBGR (pCi/g): 3.4 Estimated Conc. (pCi/g): 0.3 Alpha: 0.050 Estimated Power 1 Beta: 0.100 EMC Sample Size (N): 11 Scanning Instrumentaticon: Nal Prospective Power Curve

- 1

> os -I Ca W0.8 I W

- 0.9 -I i1 ......... I  :

= 0.6

_ 0.4 I I

-II t 0.3 I I_ _

6 02 _ _ __ __ __ _ _ _ _ _ _ __ _ _ II_ _ _ I__

O 5 0.1 F--

0 1 2 3 4 S Soil Concentfrtion (pCilg), including backgMund

- Power - DCGL - - Estimated Power

- LBGR E 1-beta Attachment 7-5 E900-05-014 COMPASS v1.0.0 3/32005 Page I

g Surface Soil Survey Plan Survey Plan Summary Site: SSGS and SNEC Open land Planner(s): WJCooper Survey Unit Name: Barrrel Bunker Area OL1 -11 Comments:

Area (ml): + 00 Classification: I Selected Test: Sign Estimated Sigma (pCi/g): 0.3 DCGL (pCi/g): 4.30 Sample Size (N): 11 LBGR (pCi/g): 3.4 Estimated Conc. (pCi/g): 0.3 Alpha: 0.050 Estimated Power: 1 Beta: 0.100 EMC Sample Size (N): 11 Scanning Instrumentation: Nal Prospective Power Curve 1~ -. -- I I I W.

ta 11 0.9

_ 0.8

-0.7 t 0.6 . ... _ _

d0.5

=0.4 - 4-I 0.3

; _ I 0.2

. ' _=I f6 5..  ! E ~_ _ . ==I

0.1 O

0 1 2 3 4 5 Soil Concentration Ci~g), ineluding background

- Power - DCGL - - Estimated Power

- LBGR a 1-beta Attachment 7-6 E900-05-014 COMPASS v1.0.0 313nOOS Page 1

g Surface Soil Survey Plan Survey Plan Summary ---

Site: SSGS and SNEC Open land Planner(s): WJCooper Survey Unit Name: Line Shack Surrounding Area OL1 -12 Comments: Not including line shack and ramp Area (i 2): 'Y0'5 / Classification: I Selected Test: Sign Estimated Sigma (pCilg): 0.3 DCGL (pCi/g): 4.30 Sample Size (N): 11 LBGR (pCi/g): 3.4 Estimated Conc. (pCi/g): 0.3 Alpha: 0.050 Estimated Power 1 Beta: 0.100 EMC Sample Size (N): 11 Scanning Instrumentation: Nal Prospective Power Curve

=1

_0.8

'Ir A.

- 0.7

= 0.6 C

• 0.5 t- 036

_ 0.2

= 0.4

j 0.1 0 1 2 3 4 S Soil Concenmfaion (pCig), including background

- Power - DCGL - - Estimated Power

- LBGR

• 1-beta Attachment 7-7 E900-05-014 COMPASS v1.0.0 3/312005 Page 1

Surface Soil Survey Plan Survey Plan Summary Site: SSGS and SNEC Open land Planner(s): WJCooper Survey Unit Name: South and West SNEC Yard Perimeter OLl-13 Comments:

Area (m2): 4.4e q go Classification: 1 Selected Test: Sign Estimated Sigma (pCi/g): 0.3 DCGL (pCilg): 4.30 Sample Size (N): 11 LBGR (pCi/g): 3.4 Estimated Conc. (pCi/g): 0.3 Alpha: 0.050 Estimated Power: 1 Beta: 0.100 EMC Sample Size (N): 11 Scanning Instrumentation: Nal Prospective Power Curve V 0. -I

-I _ _ _ _ _ _ _Ef

_ 0.8 0.7 -I _ _

.I _ _ _ _ _ _ _ _ _ _ _ _ _

I.'

4 iW t 0.6 v: 0.5

_ OA S 03 .*. _____ i

.; 0.2 6 02

- 0.1 A O I -I.I _ _ _ _ _

_ =

0 1 2 3 4 5 Soil Concentmfaonp CCi/g), incluing background

- Power - DCGL - - Estimated Power

- LBGR

• 1-beta Attachment 7-8 E900-05-014 COMPASS v1.0.0 3r132005 Page 1

Recent 01 Soil Sample Results Grid Csl 37P(/h Date lMewr 0.32 I #pv4c lStd Do 0.30 AT125 0.13 12/14/2004 AT125 0.27 12/1412004 AT124 0.3 12/13/2004 AT124 0.42 12/13/2004 AT123 0.82 12/13/2004 AT123 0.8 1211312004 AT122 0.07 1211412004 AT122 0.1 12/14/2004 AU125 0.13 12/14/2004 AU125 0.14 12114/2004 AU124 0.4 12/14/2004 AU1 24 0.4 12/1412004 AU123 0.3 1211412004 AU123 0.5 12/14/2004 AU122 0.34 12/14/2004 AU122 0.84 12114/2004 AV122 0.55 12/1312004 AV122 0.16 12/13/2004 AW123 0.13 12114/2004 AW123 0.16 12/1412004 AW123 0.13 12/14/2004 AW122 0.9 12/13/2004 AW120 0.33 1/26/2005 AX131 0.15 9/21/2004 AX131 0.13 9/21/2004 AX130 0.3 4/22/2004 AXI 30 0.13 4/22/2004 AX130 0.15 4/22/2004 AX130 0.3 4/22/2004 AX130 0.1 4/22/2004 AX129 0.4 4/22/2004 AX129 0.08 4127/2004 AX129 0.1 4/27/2004 AX129 0.35 4/27/2004 AX128 0.08 4/26/2004 AX128 0.2 4/26/2004 AX128 0.08 4126/2004 AX128 0.17 4/26/2004 Ax1 26 0.56 1/512005 Ax126 0.09 1/5/2005 AX124 0.06 1/4/2005 AX124 0.06 1/4/2005 Attachment 8-1 AZ122 0.22 10/20/2004 E900-05-014 AZI22 0.2 10/20/2004 AZ122 0.36 1/12/2005

DJ, 2X-~/

A(Z122 AZ122 0.24 1/12/2005 Recent OLI soil results (con't)

AZ122 0.13 1/12/2005 AZ122 0.34 1/12/2005 AZ122 0.2 1/12/2005 AZ121 0.5 10/20/2004 AZI21 0.15 10/20/2004 AZ121 0.28 1112/2005 AZI21 0.1 1/12/2005 AZ121 0.08 1112/2005 AZ121 0.08 1112/2005 AZ12I 0.09 1/12/2005 AU121 0.15 1/26/2005 AU121 0.6 1126/2005 AT121 0.24 1/26/2005 AT121 0.15 1/26/2005 AU120 0.4 1/26/2005 AU120 0.23 1/26/2005 AV121 0.66 1/26/2005 AV121 1.8 1/26/2005 AV120 0.66 1/2612005 AV120 0.3 1/26/2005 AW121 1 1/26/2005 AW121 0.9 1/26/2005 AW120 0.14 1/26/2005 Attachment 8-2 E900-05-014

16:55 8146352317 SNEC FACILITY RADCON PAGE 01 03/OB/2005 7YNRJ 3/15 ' 4:14- 123 60 SCL 8W Y S 7 ." 3/8/05 -14:33 4...... 0 SC

-:.a.E E~sr31815' 1:8 - 4 14 60 'SCL 4:4 4 10 -.60SC 2FN~~H 380 -

tTH149 1"14'¶0' 60 SCL:

'1.A' '4' 3//0 *1~2 - 43/4 iOSCL

• . LSHAKNORr

&. tj h 33//06 . :1.345 0 - 0SL'

'7s~O'f{' ~f5~5..: -4".- 540 6 SCL' V55 ,0!-'1:7 ' 0 35 -6.St

.' :3I8I5 '.1:0 4'.174 '-60 Si

.20.

Attachment 8-3 E900-05-014

Exhibit I Survey Unit Inspection Check Shoot O4 luINAL i2SECEON1 - SUVt NIT.INSECTION DESCRIPT Survey Unit # OL-1 (Land) Survey Unit Location CV & SSGS Footpnnts I CV Yard Date 4-18-05 lTime l 1500 Inspection Team Members R. Shepherd

-. _ ~ . . :.. . . .. -

Hi 'o: ..  :..- :SECTION-UREUN NPCIO!N N .. TF"I 14OPE3 Inspection Requirements (Check the appropriate Yes/No answer.) Yes No N/A

1. Have sufficient surveys (i.e., post remediation, characterization, etc.) been obtained for the survey unit? X

2. Do the surveys (from Question 1)demonstrate that the survey unit will most likely pass the FSS? X

3. Is the physical work (i.e., remediation & housekeeping) in or around the survey unit complete? X

4. Have all tools. non-permanent equipment, and material not needed to perform the FSS been removed? X

5. Are the survey surfaces relatively free of loose debris (i.e.. dirt concrete dust, metal flings, etc.)? X

8. Are the survey surfaces relatively free of liquids (i.e.. water, moisture, oil, etc.)? X

7. Are the survey surfaces free of all paint. which has the potential to shield radiation? . X

8. Have the Surface Measurement Test Areas (SMTA) been established? (Refer to Exhibit 2 for instructions.)

9. Have the Surface Measurement Test Areas (SMTA) data been colected? (Refer to Exhibit 2 for instructions.) X

10. Are the survey surfaces easily accessible? (No scaffolding, high reach, etc. is needed to perform the FSS) X

11. Is lighting adequate to perform the FSS? X

12. Isthe area Industrially safe to perform the FSS? (Evaluate potential fall & trip hazards, confined spaces, etc.) X

13. Have photographs been taken showing the overall condition of the area? X

14. Have all unsatisfactory conditions been resolved? X NOTE: If a 'No answer Is obtained above, the inspector should Immediately correct the problem or initiate corrective actions through the responsible sie department, as applicable. Document actions taken andlorjustifications in the Comments section below. Attach additional sheets as necessary.

Comments:

Items # 3 and 4 - Shonka surveyed dirt piles cover the mraority of the CV and SSGS footprint areas; also there are materials, tools and equipment stored within the survey unit south of the SSGS and line building that will require relocation. Lou Shamenek notified.

Item # 12 - Several grids and grid portions are located inside the switchyard fence presenting potential electrical hazard.

Item # 13 - Photographs of the survey unit were taken to show present existing conditions.

Attachment 9-1 E900-05-014 Survey Unit Inspector (print/sign) R.Shepherd t6r z<, . Date 4/19/05 Survey Designer (print/sign) W. Cooper _ Date