ZS-2016-0014, Partial Site Release Request for Additional Information

Partial Site Release Request for Additional Information

ML16028A192
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	01/26/2016
From:	Ashburner J ZionSolutions
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ZS-2016-0014
Download: ML16028A192 (84)

Text

ZIONSOLUTIONSLLc An EnergySolullons Company 10 CFR 50.83(b) 10 CFR 50.4(b)(1)

January 26, 2016 ZS-2016-0014 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-000 1 Zion Nuclear Power Station, Units 1 and 2 Facility Operating License Nos. DPR-39 and DPR-48 NRC Docket Nos. 50-295 and 50-3 04

Subject:

Zion Station Partial Site Release Request for Additional Information

References:

1.)

Gerard van Noordennen, ZionSolutions, Letter to U.S. Nuclear Regulatory Commission, "Zion Station Request for Partial Site Release," dated August 27, 2015 2.)

John B. Hickman, U.S. Nuclear Regulatory Commission, Letter to John Sauger, ZionSolutions, "Request for Additional Information related to Partial Site Release Request for Zion Nuclear Power Station, Units 1 and 2," dated November 3, 2015 ZionSolutions, the licensee for Zion Nuclear Power Station, submitted a request to the Nuclear Regulatory Commission (NRC) to remove a portion of the site from the Part 50 licenses (License Nos. DPR-39 and DPR-48) in accordance with 10 CFR 50.83(b), "Release of a power reactor facility or site for unrestricted use," as documented in Reference 1. Following initial NRC review, a Request for Additional Information (RAI), as documented in Reference 2, was received on November 3, 2015.

Responses to the three issues identified in the referenced RAI are provided in Enclosure 1. contains requested reference documentation.

There are no regulatory commitments made in this submittal. If you should have any questions regarding this submittal, please contact Robert Yetter at (224) 789-4250.

VP of Construction and D&D 101 Shiloh Boulevard, Zion

• IL 60099 (224) 789-4016

• Fax: (224) 789-4008 *www.zionsolutionscompany.com

ZionSolutions, LLC ZS-2016-0014 Page 2 of 2

Enclosures:

RAI Issue Responses :

Reference Documentation containing:

• LTP Reference 2-21, "Determination of Radionuclide Activity Concentrations in Soils in Non-Impacted Soils Adjacent to the Zion Nuclear Station"

• LTP Reference 2-22, TSD-13.-004, "Examination of Cs-137 Global Fallout in Soils at Zion Station" cc:

John Hickman, U.S. NRC Senior Project Manager (2 copies of the enclosures)

Regional Administrator, U.S. NRC Region III (1 copy of the enclosures)

Service List (Cover letter only, no enclosures)

Zion Nuclear Power Station, Unit 1 and 2 License Transfer Service List cc:

Ken Robuck Group President Disposal and Decommissioning EnergySolutions 299 South Main Street, 17th Floor Salt Lake City, UT 841.11 John Sauger Executive VP & General Manager ZionSolutions, LLC 101 Shiloh Boulevard Zion, IL 60099 Gerard van Noordennen VP Regulatory Affairs ZionSolutions, LLC 101 Shiloh Boulevard Zion, IL 60099 Anthony Orawiec Decommissioning Plant Manager ZionSolutions, LLC 101 Shiloh Boulevard Zion, IL 60099 Dan Shrum Senior VP Regulatory Affairs EnergySolutions 299 South Main Street, 17th Floor Salt Lake City, UT 84111 Russ Workman General Counsel EnergySolutions 299 South Main Street, 17th Floor Salt Lake City, UT 84111 Alwyn C. Settles Section Head, Nuclear Facility Inspection Bureau of Nuclear Facility Safety Illinois Emergency Management Agency 1011 North Street, P0 Box 250 Mazon, IL 60444 Kelly F. Grahn Senior Health Physicist, Unit Supervisor Illinois Emergency Management Agency Bureau of Radiation Safety, Environmental Management 245 W Roosevelt Road, Building 8, Suite 55 West Chicago, IL 60185 Kent McKenzie Emergency Management Coordinator Lake County Emergency Management Agency 1303 N. Milwaukee Avenue Libertyville, IL 60048-1308 John E. Matthews Morgan, Lewis & Bockius LLP 1111 Pennsylvania Avenue, NW Washington, DC 20004

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Zion Partial Site Release Response to RA~s 1 through 3

ZionSolutions, LLC ZS-2016-001!4: Enclosure 1 Page 1 ofl14

1. Comment: The determination of background values for Cs-137 needs clarification.

Basis: Section 2.3.1 summarizes the three background studies performed at the site (February 2012 ESCSG Study, March 2012 Crib House Study, and July 2012 ZionSolutions Soil Study).

During the first study in February of 2012, 15 samples of concrete, asphalt and soil were collected from the Vertical Concrete Cask Construction area. This study determined that only natural radioactivity was detected. The second study, during which concrete core samples were taken from the Crib House, also determined that only natural radioactivity was detected. In the third study of soil samples from Hosah Park, Cs-137 was identified in addition to naturally occurring radionuclides. In the Hosah Park study, 30 soil sample locations were chosen where static measurements were taken, as well as surface and subsurface volumetric samples. It is postulated that the Cs-137 is attributable to global fallout. The LTP states that while there did appear to be evidence of soil disturbance at Hosah Park, the evidence suggested that this occurred in the past and the land has been undisturbed for a number of years. The study concluded that the majority of the soil samples from Hosah Park were from disturbed soils. The Hosah Park results are summarized in Table 2-10, which shows an average of 0.0626 pCi/g and a maximum of 0.241 pCi/g.

Section 2.3.1.4 of the LTP states "The soil sample data compiled in the TSD concludes that the majority of the soil samples taken for the background studies were from disturbed soils. The Hosah Park data as well as the data obtained during the ESCSG study corresponded with documented fallout levels from disturbed soil at sites in Massachusetts, New York and Pennsylvania. Consequently, predicted ranges for background concentrations of Cs-137 were established for disturbed soils as well as undisturbed soils based on literature. These ranges are presented in Table 2-11. The upper Cs-137 concentration for each category was used as the investigation levels for non-impacted open land survey units. The upper Cs-137 concentration for disturbed, non-drainage in Table 2-11 was used as the investigation level for Class 2 and 3 open land area survey units."

Section 2.3.1.4 of the LTP suggests that the background study data from the Hosah Park and ESCSG study corresponded to global fallout levels; the LTP does not provide a basis for why this conclusion was reached even though Cs-137 was not found in the ESCSG Study or Crib House Study. The upper values of global fallout ranges were assigned as investigation levels for Cs-137 when initially characterizing the survey units. Table 2-11 provides Investigative Levels for Cs-137 Based on Background Studies. The upper value for undisturbed soil is 2.8 pCi/g or 0.66 pCi/g for a drainage or non-drainage area respectively. The upper value for disturbed soil in drainage area is 1.67 pCi/g. The upper value for a disturbed, non-drainage area, which was used for Class 2 and 3 open land area survey units, is 0.34 pCi/g. These upper values are well above the average of 0.0626 pCi/g or maximum of 0.241 pCi/g found in Hosah Park. The LTP does not provide a basis for using the upper values of the global fallout ranges from Massachusetts, New York and Pennsylvania, as opposed to the site-specific data.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 2 of 14 NUREG 1757 Vol. 2, Rev. 1, Section A.3.2, providing guidance on soil reference areas, states that "if there is a choice of possible reference areas with similar soil types, consideration should be given to selecting reference areas that are most similar in terms of other physical, chemical, geological, and biological characteristics." Section A.3.4 provides additional guidance on differences in background areas.

Path Forward:

a. Provide a basis for why the ESCGG study corresponds to documented global fallout ranges, even though Cs-137 was not found in the ESCSG study.

b. Provide a basis for assuming the upper values of the global fallout ranges from Massachusetts, New York and Pennsylvania as investigation levels, as opposed to the site-specific background reference data.

ZSRP Response (la and lb) - It should be first noted that analytical data reported as "Surface Soil Sample Analysis Results" for the July 2012 Hosah Park background assessment in Chapter 2, Table 2-10 was a modified result of the subsurface soil analysis data. Table 2-10 in LTP Chapter 2 will be revised to present both the reported surface and subsurface soil analysis data from EnergySolutions report "Determination of Radionuclide Activity Concentrations in Soils in Non-Impacted Soils Adjacent to the Zion Nuclear Station" - July 2012 as described in section 2.3.1.3. The revised Table 2-10 is presented below; Revised LTP Table 2-10 Hosah Park Background Assessment Sample Analysis Surface Soil Sample Analysis Results K-40 6.96E+00 8.95E+00 9.01E-01 Co-60

-3.19E-02 2.87E-02 1.88E-01 Sr-90

-6.03 E-04 5.26E-02 2.41 E-02 Cs-137 2.11E-01 6.51E-01 1.48E-01 Th-228 1.72E-01 4.30E-01 1.1 8E-0 1 Th-230 3.45E-01 2.07E+00 3.55E-01 Th-232 1.53E-01 5.11E-01 1.04E-01 U-234 2.03 E-01 1.74E+00 3.23 E-01 U-235 1.40E-02 1.37E-01 3.24E-02 U-238 2.11E-01 1.86E+00 3.24E-01

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 3 ofl14 Subsurface Soil Sample Analysis Results K-40 6.62E+00 8.59E+00 9.49E-0 1 Co-60 3.72E-04 3.79E-02 1.38E-02 Sr-90 4.40E-03 5.30E-02 2.16E-02 Cs-137 2.64E-02 2.41 E-O01 6.00E-02 Th-228 1.26E-01 4.50E-01 1.1 4E-0 1 Th-230 3.28E-01 8.11lE-01 2.09E-01 Th-232 1.21E-01 4.05E-01 9.54E-02 U-234 1.25E-01 7.36E-01 1.57E-01 U-235 1.05E-02 1.10E-01 2.43 E-02 U-238 1.31E-01 6.65E-01 1.47E-01 a

Bold values indicate concentration(s) greater than MDC. Italicized values indicate MDC value.

ZionSolutions TSD 13-004 "Examination of Cs-137 Global Fallout in Soils at Zion Station" evaluated the Hosah Park background data from the July 2012 background report above, combined with data from the ESCGG background report from February 2012 (that was also conducted in Hosah Park). The initial finding was that the combined Hosah Park data only represented soil from an area that was categorized as "disturbed non-drainage". Other soil types such as "disturbed drainage"~ or "undisturbed drainage" are known through literature to contain higher Cs-137 background concentrations from fallout then "disturbed non-drainage" soils. Four different soil types were identified that could have different Cs-137 backgrounds:

disturbed non-drainage disturbed drainage undisturbed non-drainage undisturbed drainage In order to address all four of the potential soil types expected to be encountered during the survey of non-impacted areas at Zion, the study "Investigations of Natural Variations of Cesium-137 Concentrations in Residential Soils" (prepared for the Health Physics Society 39th Annual Meeting in June 1994) was reviewed. This study was based on the analysis of a large population (600 sample locations from over 200 properties) of soil samples taken in New York, Massachusetts, and Pennsylvania. The specific sites reviewed in this study are all within the same atmospheric fallout region as Zion and is therefore considered applicable to Zion.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 4 of 14 Based on the analyses of the combined Hosah Park data sets, TSD 13-004 concluded that the combined Hosah Park data for Cs-137 (February 2012 ESCGG combined with the July 2012 data) fit well with fallout levels reported for disturbed non-drainage soils in the study. The maximum measured concentration of Cs-137 for disturbed non-drainage areas in the study was 3.40E-01 pCi/g with an upper 95th percentile of4.20E-01 pCi/g. This compares favorably with the combined Hosah Park data with a maximum Cs-137 concentration of 6.51E-01 pCi/g and an upper 95% confidence level of 3.95E-01 pCi/g.

TSD 13-004 also concludes that the Hosah Park location is not necessarily indicative of the Cs-137 background levels that would be expected in drainage areas, wetlands or undisturbed forest areas which are not in the undisturbed non-drainage soil category. As no site-specific background data was available for the other soil types and, taking into consideration that the combined Hosah Park data was reasonably correlated with disturbed non-drainage soils in the study, TSD 13-004 concludes that it was appropriate to use the decay corrected Luzerne County PA data from the study as investigation levels (maximum value) and action levels (upper 95th percentile value) for all disturbed and undisturbed soils for drainage and non-drainage areas.

These values are reported in Table 2-1 1 from LTP Chapter 2 which is reproduced below; LTP Table 2-11 Investigative Levels for Cs-137 Based on Background Studies Undisturbed0.0t2.004to36 Disturbed 0.00 to 1.67 0.35 to 2.86 Non-Drainage Areas Surface 0-10 cm Undisturbed 0.23 to 0.66 0.15 to 0.77 Disturbed 0.27 to 0.34 0.23 to 0.42 If during the surveys of the non-impacted survey units, a measurement (ISOCS or surface soil sample) exceeded the investigation level for a given soil type (upper value for the measured range for the applicable soil type), then an investigation would have been performed. If a measurement (ISOCS or surface soil sample) exceeded the upper 95th percentile for a given soil type, then the area would have been reclassified as impacted. The disturbed and undisturbed soil Cs-137 levels from Table 2-11 were also used as action levels to assess the classification of Class 3 open land area survey units.

c. Provide "Determination of Radionuclide Activity Concentrations in Soils in Non-Impacted Soils Adjacent to the Zion Nuclear Station" (Reference 2-21)

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 5 ofl14 ZSRP Response (lc) - LTP Reference 2-21, "Determination of Radionuclide Activity Concentrations in Soils in Non-Impacted Soils Adjacent to the Zion Nuclear Station" is provided as Enclosure 2 of this submittal.

d. Provide ZionSolutions TSD 13-004, "Examination of Cs-13 7 Global Fallout In Soils At Zion Station" (Reference 2-22)

ZSRP Response (ld) - LTP Reference 2-22, TSD 13-004, "Examination of Cs-137 Global Fallout in Soils at Zion Station" is provided as Enclosure 2 to this submittal.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 6 of 14

2. Comment: The use of Cs-137 global fallout values as an investigation level during site characterization and initial survey unit classification needs clarification.

Basis: Section 2.3.1.4 of the LTP states that the upper values of global fallout ranges were assumed as background for Cs-137 when characterizing the open land survey units. However, it is not clear how this assumption impacted the initial classification of survey units (if at all).

It is also not clear if the global fallout levels were also assumed as background in characterizing survey units consisting of concrete, asphalt, or piping. NUREG 1757 Vol. 2, Section A.3.3, states that "when there are different materials with substantially different backgrounds in a survey unit, the licensee may use a reference area that is a non-impacted room with roughly the same mix of materials as the survey unit. If a survey unit contains several different materials, but one material is predominant or if there is not too great a variation in background among materials, a background from a reference area containing only a single material may still be appropriate. However, the licensee should demonstrate that the selected reference area will not result in underestimating the residual radioactivity on other materials." The LTP suggests that the Hosah Park soil background reference area will be applied for the open land areas. It is not clear if the global fallout values will be assumed for background in other materials such as concrete, asphalt, or piping.

Table 2-31 summarizes the characterization for Class 3 Open Land Survey Units. The footnote on Table 2-31 (pg 2-153) for Survey Unit 10220C (south of the Radiological Restricted Area) indicates that while 41 out of 55 samples exceeded the MDC for Cs-137, with the maximum being 1.14 pCi/g Cs-137, an investigation concluded that the elevated levels of Cs-137 are due to global fallout. However, the details of this investigation for Survey Unit 1 0220C do not seem to be discussed in the body of the LTP.

Path Forward:

a. Define the term investigation level as applied during initial classification of survey units.

ZSRP Response (2a) - The initial classification of survey units at Zion were based on the information compiled in the Zion HSA. From June to September 2013, characterization surveys were performed in the open land areas of the site that were classified as non-impacted in the Zion HSA. The objective was to acquire sufficient radiological survey data to confirm the "non-impacted" classification and to provide reasonable assurance that the survey units in question were free of detectable plant-derived radioactive material.

The characterization survey consisted of both qualitative evaluations and quantitative analysis results. The qualitative evaluation consisted of static measurements using the Canberra In Situ Object Counting System (ISOCS). Gamma scans were performed using a Ludlum Model 23 50-1 and a Model 44-10 NaI detector. The ISOCS MDC and gamma scanning sensitivities were estimated based on the assumed geometry and the potential plant-derived gamma-emitting radionuclides that could hypothetically be present. Quantitative radionuclide specific analysis of surface soil was performed using a calibrated counting geometry. Analysis times were set to achieve the required MDCs that were based on the most limiting expected Cs-137 background due to global fallout as set forth in TSD 13-004, i.e., the maximum measured range value for disturbed non-drainage soils (3.40E-01 pCi/g).

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 7 of 14 The results of the ISOCS and soil sample analysis were compared to the appropriate background value commensurate with the soil type (as presented in Table 2-11 of LTP Chapter 2). The Cs-137 background values in Table 2-11 are reproduced from TSD 13-004 and are based on the decay corrected Luzerne County PA data from the study "Investigations of Natural Variations of Cesium-1 37 Concentrations in Residential Soils". As stated in ZSRP RAI response #1 a and lb, the maximum value of the measured range for each of the four soil categories (disturbed non-drainage, disturbed drainage, undisturbed non-drainage and undisturbed drainage) was used as the investigation level for these surveys. If during the performance of these surveys, any measurement exceeded these values, then it would have been considered as indicative of the possible presence of plant-derived radioactivity. The investigation levels were not exceeded and no investigations were performed.

b. Clarify how the investigation level may impact whether an open land survey unit area is classified as non-impacted versus impacted.

ZSRP Response (2b) - If during the surveys of the non-impacted survey units, a measurement (ISOCS or surface soil sample) exceeded the investigation level for a given soil type (upper value for the measured range for the applicable soil type), then an investigation would have been performed. If a measurement (ISOCS or surface soil sample) exceeded the upper 95%

confidence level for a given soil type, then the area would have been reclassified as impacted.

A total of 236 ISOCS measurements and 166 surface soil samples were taken during the survey of non-impacted survey units. No plant-derived radionuclide was positively identified (at concentration greater than MDC) other than Cs-137 in any sample or measurement taken. Of the 402 total measurements/samples taken in these survey units, Cs-137 was positively identified at a concentration greater than the instrument MDC in 181 measurements/samples. Of the 181 measurements/samples where Cs-137 was positively identified, 18 measurements/samples results exceeded the most limiting investigation level (3.40E-01 pCi/g applicable to disturbed non-drainage soils). Those samples results are as follows; L4-1021 7-CRGS-SS-01I 5.09E-01 5.8 1E-02 6.94E-02 Wooded area Undisturbed Non-Drainage Undisturbed L4-10217-CRGS-SS-07 5.22E-01 6.46E-02 8.19E-02 Wooded area Non-Drainage Disturbed L4-1021 7-CRGS-SS-10 4.42E-0 1 5.60E-02 5.34E-02 Wooded area Dang Undisturbed L4-1021 7-CRGS-SS-19 3.99E-0 1 6.52E-02 6.42E-02 Wooded area NnDang Undisturbed L4-1021 7-CRGS-SS-23 4.31 E-0 1 5.53E-02 6.91 E-02 Wooded area NnDang

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 8 of 14 L4-10302-VC VGS-00 1 -SS 4.20E-0 1 5.3 1E-02 6.29E-02 Marsh Undisturbed Drainage L4-10302-VCVGS-027-SS 4.64E-01 6.46E-02 8.80E-02 Native Grass Unitre Non-Drainage Undisturbed L4-1I0302-VC VGS-03 3-SS

3. 82E-0 1 5.99E-02 8.98E-02 Wooded area NnDang Undisturbed L4-10303-VCVGS-01 1-SS 3.58E-01 4.57E-02 6.52E-02 Native Grass NnDang Non-Drainage Undisturbed L4-10303-VCVGS-021-SS 3.53E-01 4.74E-02 8.21E-02 Native Grass NnDang Undisturbed L4-1I0406-VCRGS-0327-SS 3.516E-0 1 4.025E-02 4.62E-02 Woodved ara No-ra inag Undisturbed L4-10402-VCRGS-0175-SS 3.51E-0 1 54.25E-02 7.898E-02 Wooded area NnDang Non-Drainage Undisturbed L4-10402-VCRVGS-0311-S S 3.629E-0 1 4.324E-02 57.89E-02 Natived Greass NnDang Undisturbed L4-1I0404-VCRGS-0615-SS 3.81 E-0 1 4.42E-02 3.65E-02 Native Grass NnDang Undisturbed L4-10404-VCVGS-021-SS 3.89E-0 1 4.94E-02 7.410E-02 Woodved ara No-ra inag Undisturbed L4-10404-VCRGS-022-SS 53.96E-0 1 6.978E-02 7.41E-02 Wooded area NnDang As shown above, all but two of the 18 sample locations were categorized as "undisturbed non-drainage" soil. None of the 18 sample results exceeded the investigation level for the "undisturbed non-drainage" soil category (6.60E-01 pCi/g). The two samples not categorized as "undisturbed non-drainage" was classified as "undisturbed drainage" and "disturbed drainage" which both had a higher investigation level of 2.80 pCi/g and 1.67 pCi/g respectively.

Therefore, no investigations were required for any of the non-impacted survey units.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 9 of 14 No measurement taken in any non-impacted survey unit exceeded the upper value for the measured range (from Table 2-11) for all soil types. Therefore, it follows that no measurement/sample result taken in any non-impacted survey unit exceeded the exceeded the upper 95th confidence level for Cs-137 for their respective soil category and that no survey unit required reclassification to "impacted."

c. Evaluate whether initial classifications would change if actual site data were used instead of global fallout data.

ZSRP Response (2c) - ZionSolutions TSD 13-004 "Examination of Cs-137 Global Fallout in Soils at Zion Station" evaluated the Hosah Park background data from the July 2012 study combined with data from the ESCGG background study from February 2012 (that was also conducted in Hosah Park). Based on the analyses of the combined Hosahi Park data sets, the TSD concluded that the combined Hosah Park data for Cs-137 (data set from the February 2012 ESCGG background study in Hosah Park combined with the July 2012 background study in Hosah Park) fit well with fallout levels predicted for disturbed non-drainage soils. The maximum measured concentration of Cs-137 for the combined Hosah Park study was 6.51lE-01 pCi/g and an upper 95% confidence level for the data set of 3.95E-01 pCi/g.

If only the Hosah Park background data set was used, it should be noted that of the 402 total measurements/samples taken in the non-impacted survey units, no measurement of Cs-137 exceeded the maximum observed measurement of Cs-137 (6.51E-01 pCi/g) detected in the combined Hosah Park background data set. Also, of the 402 total measurements/samples taken in the non-impacted survey units, only 11 measurements (2.7%) exceed the upper 95%

confidence level of 3.95E-01 pCi/g for the actual site data set. The table below lists the 11 results exceeding 3.95E-01 pCi/g. Inspection of the table confirms that all of the 11 results are from areas with undisturbed soil types which are expected to have higher Cs-137 fallout background concentrations as described in TSD 13-004. All 11 results are below upper 95%

confidence level for their respective soil type category in Table 2-11.

In conclusion, a very small percentage, i.e., 2.7%, of the 402 non-impacted area measurement/samples slightly exceeded the upper 95% confidence level of the actual site data.

However, all 402 non-impacted area samples were below the maximum individual result from the Hosah Park background data. Also, the 11 samples that slightly exceeded the 3.95E-01 pCi/g upper 95% confidence level were well below the predicted 95% confidence levels for their respective soil type. Zion contends the review of actual site background data provides compelling and defensible support to the conclusion that all non-impacted areas are properly classified.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 10 of 14 L4-1 021 7-CRGS-SS-01 5.09E-0 1 5.8 1E-02 6.94E-02 Wooded area Undisturbed Non-Drainage Undisturbed L4-10217-CRGS-SS-07 5.22E-01 6.46E-02 8.19E-02 Wooded area Non-Drainage Disturbed L4-10217-CRGS-SS-10 4.42E-01 5.60E-02 5.34E-02 Wooded area Dang Undisturbed L4-10217-CRGS-SS-19 3.99E-01 6.52E-02 6.42E-02 Wooded area NnDang Undisturbed L4-1021 7-CRGS-SS-23 4.31 E-0 1 5.53E-02 6.91 E-02 Wooded area NnDang Undisturbed L4-10302-VCVGS-001-SS 4.20E-01 5.31E-02 6.29E-02 Marsh Dang Undisturbed L4-10302-VCVGS-027-SS 4.64E-01 6.46E-02 8.80E-02 Native Grass NnDang Undisturbed L4-10306-VCVGS-032-SS 3.96E-01 6.02E-02 8.62E-02 Native Grass NnDang Non-Drainage Undisturbed L4-1I0402-VCRGS-065-S S 34.21E-0 1 4.42E-02 7.415E-02 Woodved ara No-ra inag Undisturbed L4-10404-VCRGS-023 -SS

5. 70E-0 1 6.5 8E-02 9.69E-02 Wooded area NnDang

d. Describe the analysis that was performed to conclude that the non-impacted areas are indistinguishable from background.

ZSRP Response (2d) - If during the surveys of the non-impacted survey units, a measurement (ISOCS or surface soil sample) exceeded the investigation level for a given soil type (upper value for the measured range for the applicable soil type), then an investigation would have been performed. If during the surveys of the non-impacted survey units, a scan measurement (NaI detector) exceeded the alarm set-point (background plus the MDCR of the instrument), then an investigation would have been performed. If a measurement (IS OCS or surface soil sample) exceeded the upper 95th percentile for a given soil type, then the area would have been reclassified as impacted. These investigation levels were not exceeded during the characterization survey of the non-impacted survey units and no investigations were performed.

Consequently, ZSRP contends that no additional analysis is necessary.

e. Provide the investigation details that concluded that the elevated levels of Cs-i137 in Survey Unit 10220C are due to global fallout.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 11 of 14 ZSRP Response (2e) - Survey unit #L3 10220 is an impacted Class 3 open land survey unit.

While elevated levels of Cs-137 (elevated defined as concentrations greater than the Cs-137 levels observed in the balance of this survey unit or in the adjacent surrounding survey units) were detected and investigated during the characterization, the concentrations of Cs-137 detected (maximum observed concentration of 1.14 pCi/g) would not have changed the classification of this survey unit.

Impacted Class 3 open land survey unit #L3 10220 is the open land area along the southern border of the "Radiologically-Restricted Area". Impacted Class 3 open land survey unit

1. L3 10220, as specified in the HSA, was broken into three (3) smaller Class 3 survey units.

Class 3 survey unit #L31I0220C is the south section of the original Class 3 open land survey unit

1. 10220, as specified in the HSA. The size of the survey unit is 25,560 square meters. The area is predominantly fiat wetlands covered with native grasses and underbrush. "Bull Creek" traverses the center of the survey unit in an east/west direction. The HSA discusses the potential for low levels of radiological contaminates due to elevated enviromnental sample results taken in and at the outfalls of the storm drain system prior to 1980. As required by the survey instructions, a visual inspection was performed to identify any potential subsurface burial sites in this survey unit. No potential burial sites were identified by the inspection.

The survey design for the characterization of this survey unit called for the acquisition of 31 surface soil samples taken at random locations and 5 additional surface soil samples taken at judgmental locations. No subsurface soil samples were included as part of the survey design.

3,453 square meters or approximately 14% of the total surface area in the survey unit was scanned using a Ludlum Model 2350-1 and a Model 44-10 NaI detector.

For the area scanned, the average observed background in the survey unit was 5,395 cpm.

Background was assessed in the survey unit while holding the detector at waist height. The average observed scan measurement was 6,037 cpm with a maximum observed measurement of 8,418 cpm. Nine scan alarms were observed in this survey unit with the scan alarm set-point set at the MDCR plus background. The area exhibiting elevated activity, which was primarily located in and around Bull Creek, was investigated by additional scans and 20 investigative surface soil samples that were acquired at the locations where the scan alarms were observed.

The majority of the samples with elevated Cs-137 concentration were located in and around Bull Creek. The initial samples taken in this area contained Cs-137 levels up to 7.28E-0l pCi/g. As this Cs-137 concentration was significantly greater than those taken in the adjacent soils, investigation samples were taken along the creek bank upstream and downstream. Results of the investigations indicted Cs-137 concentrations along the creek bank ranging from 1.29E-01 pCi/g to 1.1 4E+00 pCi/g. It was postulated that background levels of Cs-137 in the soil surrounding Bull Creek concentrates in this area due to the fluctuating water levels in the creek. The samlples were generally lower in density than most of the other samples in the survey unit, indicating the possible presence of decaying organic matter.

The 56 surface soil samples (random, judgmnental and investigation) and 2 QC split samples were acquired and analyzed by the on-site gamma speetroscopy system. Cs-137 was identified at concentrations greater than the MDC of the instrument in 42 of the surface soil samples taken.

No other potential plant-derived radionuclides were positively identified. The average Cs-137 concentration observed in the analysis of the surface soil samples was 3.20E-01 pCi/g with a

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 12 of 14 maximum observed concentration of 1.1 4E+00 pCi/g. As the area in question was categorized as a disturbed drainage area, all Cs-137 results were less than the upper value of the measured range for that soil category (1.67E+00 pCi/g). Consequently, the investigation concluded that the elevated Cs-137 concentration was due to global fallout.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 13 ofl14

3. Comment: Section 2.2.1 (Data Quality Objectives), Section 2.3.4 (Non-Impacted Open Land Areas), and Section 2.3.5 (lImpacted Open Land Areas)

Section 2.2.1 of the LTP indicates that "direct measurements and scans of concrete and surface soils were also made using the same instruments and Minimal Detectable Concentrations (MDC) as will be employed for FSS," and that "volumetric samples that exhibited the highest activity were sent to an off-site laboratory for analysis of Hard-to-Detect (HTD) radionuclide(s)." This discussion indicates that HTD radionuclides are only measured during characterization when an elevated direct measurement was encountered, but it is not clear that a surrogate correlation has been established between HTD and easy-to-detect radionuclides, or that these radionuclides are co-located at the site. As such, it is not evident that a sufficient number of HTD samples were taken during characterization to establish a surrogate or to adequately characterize the radiological status of the site. For example, Section 2.3.4.1 of the LTP discusses surface soil sampling in non-impacted areas and indicates that "of the total number of surface soil samples taken and analyzed, Cs-137 was identified at concentrations greater than the MDC of the instrument in 106 surface soil samples," and that "no other potential plant-derived radionuclides were positively identified." However, it is not evident from the discussion in Section 2.3.4.1 and the corresponding results summary in Table 2-29 (Non-Impacted Open Land Survey Units -

Characterization Survey Summary) that an analysis of these soil samples was performed for radionuclides other than Cs-137 and Co-60. A similar question exists for the discussion of soil sampling related to Class 2 and 3 impacted areas, as presented in Section 2.3.5 of the LTP and Tables 2-31 and 2-32 (though footnotes associated with Class 3 areas in Table 2-31 indicate that some samples were analyzed for H-3, Fe-55, Ni-63 and Sr-90).

Basis: Per the acceptance criteria/information to be submitted described in NUREG-1 757, Vol.

2, Rev. 1, Section 4.2 (Scoping and Characterization Surveys), licensees should provide:

• A description and justification of the survey measurements for impacted media (for example, building surfaces, building volumetric, surface soils, subsurface soils, surface water, ground water, sediments, etc., as appropriate),

• The justification for considering areas to be non-impacted,

• A discussion of why the licensee considers the characterization survey to be adequate to demonstrate that it is unlikely that significant quantities of residual radioactivity have gone undetected.

Path Forward:

a. Describe the basis for only analyzing for hard-to-detect radionuclides when an elevated direct measurement was encountered during characterization.

b. Describe the analytical measurements that were performed to ensure potential plant derived radionuclides other than Cs-13 7 and Co-60 would be positively identified in both non-impacted and impacted areas.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 14 of 14 ZSRP Response (3a and 3b) - For the characterization of surface and subsurface soils at Zion, 402 combined surface soil samples and ISOCS measurements were taken in survey units designated as non-impacted. Of the 402 measurement/samples taken, Cs-137 was positively detected through gamma spectroscopy in 181 samples with a maximum observed concentration of 5.70E-01 pCi/g. No other plant-derived gamma-emitting radionuclides (i.e. Co-60) were detected at concentrations greater than the instrument MDC in any of these samples. For the characterization of surface and subsurface soils in impacted Class 3 survey units, 764 combined surface soil samples and ISOCS measurements were taken and 380 subsurface soil samples were taken. Of the 1,144 measurement/samples taken in Class 3 areas, Cs-137 was positively detected through gamma spectroscopy in 182 samples with a maximum observed concentration of 1.1 4E-00 pCi/g. Co-60 was positively identified in one sample at a concentration of 1.25E-01 pCi/g.

For the characterization of surface and subsurface soils in impacted Class 2 survey units, 59 surface soil samples were taken and 60 subsurface soil samples were taken. Of the 119 samples of soil taken in Class 2 areas, Cs-i137 was positively detected through gamma spectroscopy in 15 samples with a maximum observed concentration of 2.10E-01 pCi/g. No other plant-derived gamma-emitting radionuclides (i.e. Co-60) were detected at concentrations greater than the instrument MDC in any of these samples. For the characterization of surface and subsurface soils in impacted Class 1 survey units, 111 surface soil samples and 283 subsurface soil samples were taken. Of the 394 samples of soil taken in Class 1 areas, Cs-137 was positively detected through gamma spectroscopy in 65 samples with a maximum observed concentration of 3.39E+00 pCi/g. Co-60 was detected in 14 surface soil samples and one subsurface soil sample with a maximum observed concentration of 1.04E+00 pCi/g. No other plant-derived gamma emitting radionuclide was identified by gamma spectroscopy in these samples. The 9 surface soil samples and one subsurface soil sample taken in the Class 1 survey units that were showing the highest concentrations of Cs-137 were sent to Eberline Laboratory for full HTD analysis.

The results are presented in Table 2-34 of LTP Chapter 2. No plant-derived radionuclides, including HTD radionuclides, other than Co-60 and Cs-137, were detected by this analysis.

ZSRP contends that there is no reasonable or plausible scenario at Zion where a HTD ROC would be present without the presence of a plant-derived gamma emitting ROC.

c. Provide a justification for considering areas to be non-impacted, when it appears that HTD radionuclides may not have been considered in those areas.

ZSRP Response (3c) - No measurement or sample analysis fi'om characterization samples taken in non-impacted areas positively identified plant-derived radionuclides or Cs-137 at concentrations that exceeded what is considered background for Cs-137 at Zion. The value for Cs-137 ranged fr'om non-detectable to a maximum reading of 5.70E-01 pCi/g over 236 ISOCS measurements and 166 surface soil samples. The mean Cs-137 level detected over this sample population was 2.10E-01 pCi/g with no other plant derived radionuclides positively detected.

This provides a high degree of confidence that the non-impacted survey units are classified correctly. As previously stated, ZSRP contends that there is no reasonable or plausible scenario at Zion where a HTD ROC would be present without the presence of a plant-derived gamma emitting ROC. Consequently, ZSRP does not believe that it is technically justified or necessary to analyze samples from non-impacted areas for HTD radionuclides when no detectable plant-derived gamma emitting ROC were identified above background levels.

ZionSolutions, LLC ZS-2016-0014: Enclosure 2 Reference Documentation LTP Reference 2-21, "Determination of Radionuclide Activity Concentrations in Soils in Non-Impacted Soils Adjacent to the Zion Nuclear Station"

• LTP Reference 2-22, TSD-13-004, "Examination of C s-137 Global Fallout in Soils at Zion Station"

DETERMINATION OF RADIONUCLIDE ACTIVITY CONCENTRATIONS IN SOILS IN NON-IMPACTED SOILS ADJACENT TO THE ZION NUCLEAR STATION July 20122 Prepared By; Reviewed By; Doug Sclhult, Clip Radiological Engineer Bob Decker LTP Radiological Engineering Manager ZionSolutions, LLC Date; Date; 4*4Ž Date; 7~1 Approved By; ZionSolutions, LIC

TABLE OF CONTENETS 1.0 Introduction Page -i 2.0 Survey Design Page -3 3.0 Sample Analyses Page - 5 4.0 Minimum Detectable Activities Page -S 5.0 Survey Results Page-S5 5.1 Surface Soil Samples 5.2 Subsurface Soil Samples 5.3 Ludlum Model 44-10 Detector Measurement Results 6.0 Predicted Cs-137 Activity Concentration in Surface Soils Page - 8 Uist of Attachments;

• - Sampling Location GPS Coordinates

• e Attachment 2 - Ludlum Model 44-10 Detector 1 Minute Readings Collected at Various Heights

• -Surface Soil Sample Results

• • Attachment 4-Subsurface Soil Sample Results

1.0 INTRODUCTION

In support of the decommissioning of the Zion Nuclear Station in Zion, Illinois a survey was performed to determine the radionuclide activity concentration of key radionuclides in non impacted soils adjacent to the Zion Nuclear Station. The area chosen for the survey was the Zion City Park District's Hosah Park, located north of the Zion Nuclear Station, at the end of Shiloh Blvd. The park consists of open land areas with a small shelter and several asphalt walking trails.

There is evidence of several old foundations present. The land area is covered with native grasses and low lying brush. For the most part the open land area appears not to have been disturbed for a number of years. Figure 1 shows the location of the area chosen for survey relative to the location of the Zion Nuclear Station.

In November of 2011 an open land area adjacent to the southern boundary of Hosah Park was surveyed to confirm that the soils in this area could be free released. An area measuring approximately 600 feet by 275 feet, covering an area of approximately 165,000 ft2 (15,300 in2) was surveyed in accordance with Zion Nuclear Station's MARSAME Program. See MARSAME survey package U0-EXT-VCC-592-001. The intent of the survey was to allow soils that may be excavated during constructions activities associated with the Vertical Cask Construction (VCC) area to be moved and/or free released from the site without further radiological concerns. The survey consisted of gamma scans and systematic surface and subsurface soil sampling at 30 sampling locations. The gamma scans failed to identify any areas of elevated activity. The combined data sets, consisting of 60 soil sample analysis results had a mean Cs-137 activity concentration of 1.50E-2 pCifg and a maximum Cs-137 activity concentration of 1.28E-1 pCi/g.

The mean Cs-137 activity concentration for the 30 surface soil samples was 1.14E-2 pCi/g. The sample analysis results were considered to be consistent with expected Cs-137 activity concentrations in disturbed soils due to global fallout and not due to licensed activities associated with the Zion Nuclear Station. This MARSAME survey provided assurance that the open land areas in Hosah Park were not impacted by licensed activities associated with the Zion Nuclear Station.

The survey in Hosah Park was designed to determine the radionuclide activity concentrations of key radionuclides, both naturally occurring and manmade, in surface and subsurface soil. Of particular interest is the activity concentration of Cs-137 in soil due to global fallout since Cs-137 is also one of the more predominant, and easily identified, radionuclides associated with licensed activities at the Zion Nuclear Station. The results of this survey will be used in the future evaluation of soils associated with the Zion Nuclear Station to help ensure that soils impacted by site operations are identified.

Page 1 of 10

Figure 1 Survey Area Relative to Zion Nuclear Station N 4U 48 3?

3 3 S

3 I

i I

N i

i-"

U I

6 3406 Iw.ml ii*

III 4 ~ ~~8A'5R'~ I jJ~

Page 2 of 10

2.0 Survey Design The survey design included surface and subsurface soil samples as well as static gamma measurements using a Ludlum 44-10 sodium iodide detector at several distances above the surface of the ground. The survey was designed to; Determine the mean activity concentration and related statistical parameters of key radionuclides in surface soils (0 -15 cm) that have not been impacted by Zion Nuclear Station operations.

Determine the mean activity concentration and related statistical parameters of key radionuclides in subsurface soils (30 - 60 cm) that have not been Impacted by Zion Nuclear Station operations.

Determine the mean response and related statistical parameters of a Ludlum Model 44-10 detector at various distances above soils that have not been impacted by site operations.

Prior to the survey, thirty (30) soil sampling locations were identified in Hosah Park. The sampling locations were chosen in areas that appeared to be undisturbed with minimal vegetation. Each sampling location was flagged and labeled with a sequential number beginning with 001. A GPS device was used to record the GPS coordinates of each of the sampling locations. Attachment 1 contains a listing of the GPS coordinates for each of the sampling locations.

Prior to sampling, all vegetation was cleared from an area of approximately 2 ft2 surrounding each sample location. Once the vegetation was cleared, a one minute count using a Ludlum Model 44-10 detector was collected in contact with the ground and at a height of 15 cm above the ground's surface at each of the sampling locations. Attachment 2 contains a listing of the measurement results collected at each of the sampling locations.

At each sampling location a surface (0 -15 cm) and a subsurface (30 -60 cm) soil sample was collected. As they were collected each soil sample was screened in the field to remove debris, vegetation, and rocks greater than 1 cm in diameter. Each sample was then'placed in a pre labeled sample container and chain of custody paperwork initiated in anticipation of sending the samples to an offsite laboratory for analysis. The surface and subsurface samples collected from two of the sampling locations (01, and 16) were split and submitted to the offsite laboratory as separate samples. A total of 64 samples were submitted to the offsite laboratory for analysis.

Page 3 of 10

Sample containers were pre labeled with a 17 digit alpha numeric sample number. The following example is the sample number for a surface soil sample collected at sample location 001; L4BKGOIBJGSSAOOt iThe first digit "L" designates that the sample came from an open land area.

The second digit "4" designates that the sample came from a non-impacted area.

The third, fourth, and fifth digits indicates the survey area, "BKG" was chosen to designate a survey area for conducting a background study.

The sixth and seventh digit indicates the survey unit, "01" was chosen to represent Hosah Park.

The eighth digit "B' designates that the sample as a background sample.

The ninth digit designates whether the sample Is a biased (judgmental) sample "J" or if the sample is a QC sample "Q".

The tenth digit "G" designates that the sample was from the ground.

• The eleventh digit "S" designates that the sample is a soil sample.

The twelfth and thirteenth digits designate whether the sample is a surface "SS" or a subsurface "BS" soil sample.

The fourteenth digit "A" allows for the survey unit to be subdivided if necessary The fifteenth, sixteenth, and seventeenth digits "001" designate which sample location the sample was obtained from.

At the completion of sampling each sample location was backfilled. Once the GPS data for each of the sampling locations was validated, the flags marking the sample locations were removed.

Page 4 of 10

3.0 Sample Analyses Each soil sample was shipped to Teledyne Brown in Knoxville, Tennessee for analysis. Prior to analysis each soil sample was dried and homogenized. Each soil sample was analyzed for gamma emitting nuclides by gamma spectroscopy (Co-60 and Cs-137), Sr-90, tharium isotopic (Th-228, Th-230, and Th-232), and uranium isotopic (U-234, U-235, and U-238).

Teledyne Brown performed a receipt inspection for each of the samples received and validated that; The sample containers were received in good condition, A chain of custody form was received with each sample, All of the samples listed on the chain of custody were received,

• .* Each sample container contained a label, and The information on the labels matched the information on the chain of custody form.

Four batches of samples were sent to Teledyne Brown using four separate chain of custody forms. For each batch of samples received for analysis Teledyne Brown analyzed a method blank, a laboratory corntrol sample, and performed a duplicate analysis on an arbitrary sample.

4.0 Minimum Detectable Activity The minimum detectable activity specified for the four required analyses; gamma spectroscopy (Co-SO, Cs-137), Sr-90, thorium isotopic (Th-228, Th-230, and Th-232), and uranium isotopic (U-234, U-235, and U-238) was less than 0.1 pCi/g. In all cases the offsite laboratory was able to achieve this MDA, except in those cases where the radionuclide specific activity concentration in the sample exceeded the MDA.

5.0 Survey Results The sample analysis results for select radionuclides are provided in Attachment 3 for the surface soil samples and in Attachment 4 for the subsurface soil samples. Analysis results associated with the gamma spectroscopy analyses for K-40, Co-60, and Cs-137 are included. While other radionuclides were identified by gamma spectroscopy, none of these other radionuclides could be attributed to licensed activities. The radionuclides identified by the gamma spectroscopy analyses not listed in Attachments 3 and Attachments 4 are primarily due to decay products associated with the naturally occurring thorium and uranium decay chains.

Page 5 of 10

5.1 Surface Soil Samples Table 5-1 provides a summary of the surface soil sample results; Table 5-1 Surface Soil Samples_________

Mean Activty 1 Maximum Activity Standard Radian ucl ide Co ncentration Concentration Deviation (pCi/g) pCi/g)

(pCi/g)

K-40 6.96E+0 8.95E+0 9.01E-1 Co-60

-3.19 E-2 2.87 E-2 1.88E-1 Sr-90

-6.03 E-4 5.26 E-2 2.41 E-2 Cs-137 2.11E-1 6.51E-1 1.48E-1 Th-228 1.72E-1 4.30E-1 1.18E-1 Th-230 3.45E-1 2.07E+O 3.55E-1 Th-232 1.53E-1 5.11E-1 1.04E-1 U-234 2.03E-1 1.74E+0 3.23E-1.

U-235 1.40E-2 1

1.37E-1 3.24E-2 U-238 2.11E-1 j

1.86E+O 3.24E-1 With the exception of the naturally occurring radionuclides, the only other radionuclide identified in the surface soil samples was Cs-137. Although Cs-137 is a licensed radionuclide associated with operation/decommissioning of the Zion Nuclear Station it is assumed that the Cs-137 activity concentrations in surface soils summarized in Table 5-1 are due to radioactive fallout.

Page 6 of 10

5.2 Subsurface Soil Samples Table 5-2 provides a summary of the subsurface soil sample results; Table 5-2 Subsurface Soil Samples_________

Mean Activity Maximum Activity Standard Radionuclide Concentration Concentration Deviation (pCi/g)

(pCi/g)

(pCi/g)

K-40 6.62E+0 8.59E+0 9.49E-1.

Co-60 3.72E-4 3.79E-2 1.38E-2 Sr-90 4.40E-3 5.30E-2.

2.16E-2 Cs-137 2.64E-2 2.41E-1 6.00E-2 Th-228 1.26E-1 4.50E-1 1.14E-1 Th-230 3.28E-1 8.11E-1 2.09E-1 Th-232 1.21E-1.

4.05E-1 9.54E-2 U-234 1.25E-1 7.36E-1 1.57E-1 U-235 1.05E-2 1.10E-1 2.43E-2 U-238 1.31E-01 6.65E-1 1.47E-1 As with the surface soil samples, the only other radionuclide, with the exception of the naturally occurring rad~ionuclides, identified in the subsurface soil samples was Cs-137.

However, Cs-137 was only detected in 5 out of 30 subsurface soil samples as compared to 26 out of 30 of the surface soil samples. For the purpose of this report a radionuclide is considered detected when its radionuclide specific activity concentration exceeds both the MDA for the analysis and the 2 o error term associated with the analysis.

Page 7 of 10

5.3 Ludlum Model 44-10 Detector Measurement Result Table 5-3 provides a summary of the, 1 minute, Ludlum Model 44-10 detector measurements at various distances above the ground; Table 5-3 Ludlum 44-10 Detector Measurements Distance Mean Maximum Standard Above (cpm)

(cpm)

Deviation Ground (cpm)

(cm)

Contact 4,464 4,759 129 15 4,432

.4,733 137 The Ludlum Model 44-10 detector measurement results summarized in Table 5-3 show no difference between the contact measurements and the measurements taken at a height of 15 cm. The results also show no indication of elevated activity at any of the measurement locations.

6.0 Predicted Cs-137 Activity Concentration in Surface Soils A review of the Cs-137 sample analysis results for surface and subsurface soil samples summarized in Tables 5-1 and 5-2 show a clear difference in the results. Clearly the sample results can be attributed to two distinct populations. It is postulated that some portions of the open land areas comprising Hosah Park that were sampled during this survey were in fact disturbed areas, allowing surface and subsurface soils to mix. In order to determine the mean activity concentration of Cs-137 in surface soil that have not been impacted by Zion Station operations the surface soil sample analysis results for Cs-137 provided in Attachment 3 have been further analyzed. Of the 32 sample analysis results seven have been eliminated since Cs-137 was not detected in these samples. The analysis results for the remaining 25 samples is provided in Table 6-1 Page 8 of 10

Table 6-1

__________________Cs-137 Activity Concentrations in Surface Soil Sample Number Act~vty (pCi/g) 2 o error (pCi/g)

MDA (pCi/g)

L4BKG01BJGSSSAO2 1.37E-1 5.77E-2 5.29E-2 L4BKGOIBJGSSSAO3 8.32E-2 5.2.6E-2 5.94E-2 L4BKG01BJGSSSAO4 1.23E-1 6.75E-2 5.01E-2 L4BKG01BJGSSSA05 1.72E-15.7-4.E-L4BKG01BJGSSSA06 4.97E-18.4-55E2 L4BKG01BJGSSSA07 3.34E-192125.7-L4BKG01BJGSSSA09 2.66E-15.E-44E2 L4BKG01BJGSSSA10 1.94E-15.E254E-L4BKG01BJGSSSA11 1.51E-14.E-43E2 L4BKGO1BJGSSSA12 3.12E-16.9-5,9-L4B KGO1 BJ GSSSA13 3.17 E-169E-4,E-L4BKGO1BJGSSSA15 2.80E-1 7.38E-2 5,17E-2 L4BKG01BJGSSSA16 2.18E-1 5.72E-2 5.O0E-2 L4BKG01 BJGSSSA17 2.5S2E-1 6.53 E-2 6,11 E-2 L4BKGO1BJGSSSA19 8,06E-2 5.21E-2 4,87E-2 L4BKGO1BJGSSSA20 4.02E-1 6.32E-2 4.71E-2 L4BIKGD1BJGSSSA21 6.51E-1 8.77 E-2 5.85E-2 L4BKG01BJGSSSA22 2,53E-1 6.56E-2 5,56E-2 L4BKGO1BUGSSSA23 2.25E-1 7.19E-2 5.97E-2 L4BKG01BJGSSSA25 2.89E-1 6.11E-2 4.76 E-2 L4BKGO1BJGSSSA2G 2.01E-1 5.81E-2 4.79E-2 L4BKGO1BJGSSSA27 2.27E-1 j

6.92E-2 4.40E-2 L4BKGO1BJGSSSA2B 2.41E-1 6.45E-2 5.O1E-2 J

L4BKG01BJGSSSA29 2,77E-1 7.17E-2 4.90E-2 L4BKG01BJGsSsA30 2.60E-1 6.15E-2 4.13E-2 Number 25 Mean 0.26

• Maximum 0.65 Standard Deviation 0:13 UCLmean 0.31 Page 9 Of 10

Based on the data presented in the Table 6-I the Upper Confidence Level of the Mean of the Cs-137 activity concentrations in undisturbed surface soil in the vicinity of the Zion Nuclear Station is 3.1E-1 pCi/g. Individual activity concentrations as high as 7.4E-1 (6.51E-1 + 8.77-E-2) pCi/g for Cs-137 in undisturbed surface soil would not be unexpected. These results compare favorable to data contained in an August 2005 Human Health Fact Sheet published by Argonne National Laboratory which stated that "The concentration of cesium-137 is surface soil from fallout ranges from about 0.1 to 1 picocurie (pCi)/g, averaging less than 0.4 pCilg."

Page 10 of 10 Sampling Location GPS Coordinates_______________

Sample Location Number Northing Easting 001 642344.0534722 002 642348.84 343768.87 03 642359.14 343773.78 004 642358.54 343779.18 005 642363.36 343784.70 006 642366.39 343779.80 007 642371.09 343773.91 008 642376.90 343777.31 009 642378.36 343783.08 010 642378.71 343787.07 011 642378.01 343792.20 012 642358.54 343788.74 013 642387.43 343785.62 014 642389.91 343781.38 015 642394.14 343782.44 016 642392.77 343785.67 017 642392.28 343791.59 018 642394.10 343795.93 019 642395.13 343792.08 020 642395.81 343787.90 021 642396.25 343783.63 022 642397.71 343782.46 023 642400.89 343783.64 024 642398.81 343791.63 025 642397.81 343793.86 026 642395.33 343804.09 027 642399.48 343803.90 028 642400.86 343796.20 029 1642401.14 343794.38 030 1642405.53 343797.33 Page '1 of 1 Ludlum Model 44-10 Detector 1 Minute Readings Collected at Various Heights Sample Location Number Contact Reading (counts) 15 cm Reading (counts) 001 4318 4279 002 4272 4334 003 4540 4402 004 4530 4395 005 4373

.4372 006 4384 4403 007 4531 4391 008 4426 4502 009 4759 4733 010 4656 4471 011 4573 4719 012 4502 4422 013 4603 4615 014 4453 4390 015 4466 4458 016 4591 4527 017 4605 4627 018 4473 4487 019 4451 4326 020 4447 4353 02.1 I4598 4596 022 4353 4407 023 4263 4274 024 4297 4330 025 4507 4386 026 4258 4105 027 4294 4236 028 4587 4516 029 4487 4392 030 4337 4500

• Page 1 of: 1 Surface Soil Sample Results

SAMPLE ANALYSIS RESULTS FOR SELECT RADIONUCLIDES - SURFACE SOILS Sample Number K-40 Sr-90 1Co-60 Cs-137 Activity 2 o Error MDA Activity 20o Error MDA Activity 2 o Error MDA.

Activity 2 a Error MDA pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g L4BKGO1BJGSSSAO1 L4BKGO1CUGSSSA01 L4BKGO1BJGSSSA02 L4BKGO1BJGSSSA03 L4BKGO1BJGSSSA04 L4BKGO1BJGSSSA05 L4BKGO1BJGSSSA06 L4BKGOIBJGSSSA07 L4BKGOIBJGSSSA08 L4BKGO1BJGSSSA09 L4BKGOIBJGSSSA1O L4BKGO1BJGSSSAl1 L4BKGO1BJGSSSA12 L4BKGO1BJGSSSA13 L4BKGO1BJGSSSA14 L4BKGO1BJGSSSA15 L4BKGO1BJGSSSA16 L4BKGO1QUGSSSA16 L4BKGOQIUGSSSA17 L4BKGO1QJGSSSA18 L4BKGO1QJGSSSA19 L4BKGO1OJGSSSA2O L4BKGO1QJGSSSA21 6.01E+00 7.26E-01 5.85E+00 1.22E+00 6.06E+00 1.14E+O0 7.20E+0O 1.09E+00 5.65E+0O 1,05E-'00 7.97E+00 9.41E-01 6.03E+00O 1.30E+0O 6.55E+O0 1.15E+00 5.80E+00 1.05E+00 7.47E+0O 1.09E+00 8.59E+00 1.23E+00 8.57E+00 9.90E-01 6.55E+00 9.55E-01 7.98E+00 1.03E+00 6.21E+00 9.90E-01 6.89E+00 1.07E+00 6.00E+O0 9.82E-01 8.55E+O0 9.11E-01 7.18E+0O 9.89E-01 6.63E+00 1.39E+00 7.70E+0O 1.08E+00 6.83E+00O 9.35E-01 7.91E+00 1.03+00 2.77E-01 4.25E-01 5,50E-O1 4.43E-01 5.48 E-01 4.37E-01 4.04E-01 5.80E-01 4.18E-01 5.26E-01 5.0DE-01 3.45E-01 5.17E-O1 3.31E-01 4.18E-01 4.71E-01 3.39E-01 3.08E-01 3.79E-01 5.01E-01 4.03E-01 4.O0E-01 3.92E-01 1.18E-02 7.43E--03

-7.41E-03 8.74E-03

-3.55E-02

-7.32E-03 1.05E-02 1.27E-03

-2.25E-02 1.42E-02

-3.29E-02

-1.65E-02

-3.28E-02

-6.13E-D3 1.10E.-02

-1.21E-04 2.02E-02 3.41E-02

-6.22E-03 2.96E-03

-4.79E-02 1.45E-02 2.55E-02 2.65E-02 3.04E-02 2.69E-02 2.79E-02 2.66E-02 3.30E-02 2.87E-02 2.41E-02 2.64E-02 2.84E-02 2,38E-02 3.02E-02 2.83E-02 3.30E-02 3.21E-02 2.44E-02 2.91E-02 4.78E-02 2.05E-02 2.25E-02*

4.74E..02 5.05E-02 6.1OE-02 5.09E-02 5.94E.-02 5.46E-02 5.41E-02 5.75E-02 6.67E-02 5.56E-02 4.77E-02 5.56E-02 5.44E-02 5.21E-02 6.23 E-02 6.08E-02 6.63E-02 6.20E-02 4.85E-02 4.57E-02 7.49E-02 3.46E-02 3.67E-02 8.14E-02 9.82E-02 9.77E-02

-1.16E-02 1.69E-03

-1.66E-03 2.87E-02

-2,71E-02

-4.08E-03 2.49E-03

-4.17E-03 5.72E-03 5.08E-03 1,41E-02 2.47E-02

-1.15E-02

-5.01E-03

-5.28E-03

-1.09E-02

-1.06E+O0 5.51E-03 2.24E-02

-2.97E-02

-1.22E-02

-1.10E-03 2.87E-02 2,20E--02 3.44E-02 3.06E-02 3.95E-02 4.00E-02 2.78 E-02 4.12E-02 3.96 E-02 3.49E-02 2.48E-02.

3.72E-02 3.28E-02 3.27E-02 3.28 E-02 3.36SE-02 3.64E-02 2.83E-02 2.92E-02 3.12E-02 3.57E-02 2.62E-02 2.87E-02 3.O1E-02 3.34E-02 5,59E-02 4.62E-02 7.34E-02 6.02E-02 4.51E-02 6.74E--02 6.33E-02 5.86E-02 4.19E-02 6.38E-02 6.02E-02 5.09E-02 5.23E-02 5.25E-02 5.55E-02 4.18E-02 4.89E-02 5.79E-02 4.58E-02 3.90E-02 4.77E-02 5.64E-02

-2.61E-03 2.42E-02 3.42E-02 1.37E-O1 5.77E-02 8.32E-O2 5.16E-02 1.23E-G1 6.75E-02 1.72E-01 5.37E-02 4.97E-01 8.54E-02 3,34E-01 9,21E-02 1,22E-02 4.24E-02 2.66E-D1 5.53E-02 1.94E-01 5.57E-02 1.51E-O1 4.74E-02 3,12E-O1 6.09E-02 3.17E-01 6.99E-02 1.05E-02 2,84E-02 2.80E-O1 7.38E-02 2.18E.-01 5.72E-02 7.57E-03 3.O0E-02 2.52E-01 6.53E-02 8.86E-02 4.41E-02 8.06E-02 5.21E-02 4.02E-01 6.32E-02 6.51E-01 8.77E-02 3.97E-02 6,20E-02 5.29E-02 5.94E-02 5.01E-.02 4.01E-02 5.58E-02 5.27E-02 6.22E-02 4.46E-02 5.41E-02 4.39E-02 5.09E-02 4.46E-02 4.42E-02 5.17E-02 5.00E-02 5.05E-02 6.11E-02 9.22E-02 4.B7E-02 4.71E-02 5.85E-02 Page 1 of 6

Sample Number K-40 Activity 2 a Error pCi/g pCi/g MDA pCi/g St-90 Activity 2 oi Error pCi/g pCi/g M DA pCi/g Co-60 Activity 2 oi Error pCi/g pCi/g L4BKG01BJGSSSA22 L4BKGOIBJGSSSA23 L4BKGO1BJGSSSA24 L4BKGO1IBGSSSA25 L4BKGOIBJGSSSA26 L4BKGOIBJGSSSA27 L4BKG01BJGSSSA2.8 L4BKG01BJGSSSA29 L4BKG01BJGSSSA30 6.92E+OO 1.05E+00 4.22E-01.

6.20E+00 9.62E-01 5.43E-01 7.89E+00 7.50E-01 2.23E-C1 7.64E+0O 9.35E-01 3.71E-O1 6.68E+00 1.03E+00 4.02E-01 7.31E+00 9.28E-01 3.42E-O1 7.47E+00 9.46E-01 4.20E--O1 7.05E+00 9.61E-01 4.66E-01 5.44E+00 8.11E-01 4.27E-01 5.26E-02 1.63E-O2

-3.71E-02 1.36E-02

-2.99E-02

-2.06E-02 4.79E-O2

-1.15E-03

-7.83E-O3 5.78E--02 8.88E-02 1.96E-02 3.68E--02 4.64E-02 9.79E-O2 4.12E-02 8.01E-O2 4.31E-02 8.98E-02 4.61E-02 9.44E--02 4.98E-02 9.29E-02 1.52E-02 3.05E-02 2.49E-02 5.06E-02 7.70E-03 3.54E-03

-1.08E-05

-1.47E-02 2,00E-02 7.11E-03 5.69E-O3

-9.79E-O3 4.48E-03 2.98E-O2

2. 22E-02 2.14E-02 2.18E-02 3.08E-02 2.69E-02 3.04E-02 2.18E-02 2.78E-O2 MDA pCi/g 5.12E-O2 4.74E-02 3.53E-02 2.91E-02 5.65E-02 4.55E-02 5.13E-02 3.95E-02 5.54E-02 Cs-1.37 Activity 2 a Error pCi/g pCi/g 2.53E.-1 6.56E-02 2.25E-01 7.19E-02

-7.93E-03 2.11E-02 2.89E-01 6.11E-02 2,01E-01 5.81E-02 2.27E-O1 6.92E-02 2.41E-01 6.45E-O2 2.77E-01 7.17 E-02 2.60E-O1 6.15E-02 M DA pCi/g 5.56E-02 5.97E-02 3.35E-02 4.76E-02 4.79E-02 4.40E-02 5.0 1E-02 4.90E.-02 4.13 E-02 6.96E+00 MEAN 8.59E400 MAX 9.01E-01 STDEV

-6.03E-04 5.26E-02 2.41E-02 MEAN MAX STDEV

-3.19E-02 2.87E-02 1.88E-01 MEAN MAX STDEV 2.11E-01 MEAN 6.51E-01 MAX 1.48E-O1 STDEV Page 2 of 6

SAMPLE ANALYSIS RESULTS FOR THORIUM - SURFACE SOILS Sample Number L4BKGO1BJGSSSA01 L4BKG01QJGSSSA01 L4BKGO1BJGSSSA02 L4BKGD1BJGSSSA03 L4BKG01BJGSSSA04 L4BKG01BJGSSSA05 L4BKG01BJGSSSA06 L4BKGO1BJGSSSA07 L4BKGO1B.IGSSSA08 L4BKGOIBJGSSSA09 L4BKGOIBJGSSSA1O L4BKG01BJGSSSA11 L41BKG01BJIGSSSA12 L4BKG01BJGSSSA13 L4BKG01BJGSSSA14 L4BKGO1BJGSSSA15 L4BKG01BJGSSSA16 L4BKGO1QJGSSSA16 L4BKG01BJGSSSA17 L4BKGO1BJGSSSA18 L4BKGO1BJGSSSA19 L4B KGO1BJIGSSSA20 L4BKG01BJGSSSA21 Activity pCi/g 1.90E-O1 1.91E-O1 1.55E-01 1,07E-01 1.46E-01 1.36E-01 2.49E-01 1.59E-02 3.88E-O1 4.94E-02 2.46E-O1 4.30E-01 6.23E-03 2.23E-01 2.99E-01 1.27E-01 3.19E-01 2.53E-01 1.97E-02 3.73E-01 2.44E-01 5.11E-02 1.a6E-01 Th-228 2 o Error pCi/g MDA pCi/g Activity pCi/g Th-230 2 a Error pCi/g 9.06E-02 9.97E-02 8,20E-02 6,62E-02 8,39E-02 9.16E-02 7.58E-02 6.11E-02 7.33E-02 4.93E-02 7.88E-02 7.16E-02 1.03E-01 6.39E-02 6.64E-02 4.71E-02 2.56E-O1 3.07 E-01 4.66E-02 3.61E-02 1.37E-O1 1.39E-01 1.81E-01 9.99E-02 4.6 1E-02 8.02E-02 1.24E-01 1.01E-01 1.62E-01 2.93E-02 7.35E-02 6.68E-02 1.19E-01 1.43E-01 1,45E-01 1.64E-O1 5.51E-02 9.09E-02 1.74E-01 1.88E-01 1,05E-01 9.83E-02 9.04E-02 8.48E-02 1,24E-O1 5.22 E-02 5.94E-01 1,38E-O1 3.52E-01 1.04E-01 5.78E-01 1.41E-01 3.26E-01 1.25E-01 2.68E-O1 9.85E-02 2.15E-O1 9.12E-02 3.50E-01 1.20E-01 4.75E-02 5.60E-02 2.07E+00 5.07E-O1 3.06E-01 1,13E-O1 2.95E-01 1.40E-O1 4,55E-01 1.82E-01 3.54E-01 1.84E-01 3.59 E-O1 1.47E-01 5.23 E-02 7.O1E-02 3.27E-01 1.13E-01 4.58E-01 1.18E-01 4.74E-01 1.70E-01 1.07E-01 7.51E-02 4.14E-01 1.61E-01 6.09E-O1 1.53E-01 2.O0E-02 6.48E-02 3.50E-02 7.03E-02 MDA pCi/g 4.94E-02 3,42E-02 6.05E--02 6.05E-02 3.45E-02 3.17 E-02 1.20 E-02 5.7 1E-02 1.01E-01 7.15E-02 1.08E-01 6.99E-02 7.94E-.02 1.89E-02 5.41E-02 3.62E-02 6.21E-02 9.13E-02 3.40E-02 9.31E-02 7.08E-02 8.39E-02 5.17E-02 Activity pCi/g Th-232 2 a Error pCifg 2.08E-01 8.00E-02 2.18E-01 8.29E-02 1.81E-O1 7.72E-02 8.81E-02 6.25E-02 1.57E-01 7.22E-02 1.52E-01 7.50E-02 1.87E-01 8.54E-02 4.80E-02 4.86E-02 5.11E-01 2.46E-01 1.10E-01 6.76E-02 9.67E-02 8.06E-02 1.71E-01 1.06E-01 2.18E-01 1.41E-O1 1.79E-01 1.04E-01 1.31E-01 1.07E-01 1.27E-01 6.59E-02 2.18E-O1 8.11E-02 2.76E-01 1.27E-01 2.48E-02 3.51E-02 2.12E-01 1.13E-01 2.69E-01 9,88E-02 9.17E402 1.07E-01 0.00E+00 0.00E+00 MDA pCi/g 2,85E-02 4.42E-02 3.02E-02 1.62E-02 1.99E-02 2.24E-02 3.88E-02 1.77E-02 1.43E-01 4.38E-02 6.61E-02 4.04E-02 5.62E-02 5.10E-02 5.41E-02 2.09E-02 4.59E-02 5,27E-02 1.83E-02 5.38E-02 3.34E-02 4.51E-02 5.17 E-02 Page 3 of 6

Sample Number L4BKGO1BJGSSSA22 L4BKGO1BJGSSSA23 L4BKGOIBJGSSSA24 L4BKGOIBJGSSSA25 L4BKGOIBJGSSSA26 L4BKGO1BJGSSSA27 L4BKGO1BJGSSSA28 L4BKGOIBJGSSSA29 L4BKGOIBJGSSSA30 Th-228 Activity 2 o Error pCi/g pCi/g MDA pCi/g 9.55E-02 1.28E-O1 9.88E-02 3.31E-01 1.92E-O1 1.74E-01

-7.29E-03 1.46E-02 5.76E-02 1.70E-01 1.03E-01 9.31E-02

-1.37E-02 4.30E-02 9.68E-02 1.49E-01 7.67E-02 5.28E-02 1.46E-01 7.89E-02 6.82E-02 1.65E-01 8.63E-02 6.68E-02 1.50E-01 8.67E-02 1.30E-O1 Activity pCi/g 0.O0E+00 3.42E-01 2.91E-01 1.38E-01 1.22E-01 2.72E-01.

2.20E-01 2.89E-01 3.00E-01 Th-230 2 o Error pCi/g 0.00E+00 1.78E-01 1.63E-01 8.19E-02 7.17E-02 1.02E-01 9.04E-02 1.09 E-01 8.35E-02 MDA pCi/g 5,25E-02 7.68E-02 3.06E-02 4.61E-02 5.87E-02 3.70E-02 3.02E-02 1.26E-02 3.34E-02 Activity pCi/g O.00E+00 2.70E-01 0.00E+00 1.88E-01

-1*21E-02 1.06E-01 1.68E-01 1.53E-O1 1.59E-01 Th-232 2 G Error pCi/g O.OOE+00 1.55E-01 0.00E+00 9.51E-02 1.21E-02 6.06E-02 7.74E-02 7,85E-02 6.15E-02 MDA pCi/g S.25E-02 5.43E-02 3.06E-02 4.61E-02 4.79E-02 2.14E-02 2.14E-02 4.O5E-02 3.34E-02 1,72E-01 4.30E-01 1.18E-01 MEAN MAX STDEV 3.45E-01 2.07E+00 3.55E-01 MEAN MAX STDEV 1.53E-01 5.11E-01 1.04E-01 MEAN MAX STDEV Page 4 of 6

SAMPLE ANALYSIS RESULTS FOR URANIUM -SURFACE SOILS sample Number L4BKG01BJGSSSA01 L4BKG01QJGSSSA01 L4BKG01BJGSSSAO2 L4BKGO1BJGSSSA03 L4BKG01BJGSSSA04 L4BKG01BJGSSSA05 L4BKG01BJGSSSA06 L4BKG01BJGSSSA07 L4BKGO1BJGSSSA08 L4BKGOIBJGSSSA09 L4BKG01BJGSSSA10 L4BKG01BJGSSSA11 L4BKG01BJGSSSA12 L4BKG01BJGSSSA13 L4BKGOIBJGSSSA14 L4BKGO1BJGSSSA15 L4BKGO1BJGSSSA16 L4BKGOIQJGSSSA16 L4BKGOIBJGSSSA17 L4BKGO1BJGSSSA18 L4BKGO1BJGSSSA19 L4BKGO1BJGSSSA20 IL4BKGO1BJGSSSA21 Activity pci/g 2.88E-O1 6.49E-03

-i.55E-O2 4.99E-02

-1.07E-O2 2.97E-01 1.49E-01 7.5OE-02 1.74E+00 4.37E-01 O.OOE+O0 0.00E+O0 9.16E-02 2.69E-02 0OJOE+OO O.00E+00 2.67E-01 1.75E-01.

2.57E--01 2.13E-01 2.99E-O1 2.51E-01 8.23E-03 U-234 2 a Error pCi/g MDA

.pCi/g 1.72E-01 1.60E-01 4.73E-02 8.25E-02 2.20E-02 8.67E-02 7.81E-02 8.41E-02 2.14E-02 8.44E-02 1.40E-O1 6.44E-02 1.36E-01 4.39 E-O2 7.61E-02 2.77E-O2 6.75E-O1 4.22E-O1 2.65E-01 2.62E-01 2.42E-02 4.39E-02 0.00E+00 4.35E-02 8.25E-02 2.70E-02 4.20E-02 4.53E-02 O.00E+00 5.19E-02 1.53E-02 5.45E-02 1.26E-O1 5.66E-02 9.85E-02 7.83E-02 1.59E-O1 1.80E-01 1.22E-O1 1.37E-01 1.43E-01 1.44E-O1 1.16E-01 1.76E-02 4.19E-02 7.04E-02 Activity pCi/g

-8.32E-03 1.71E-02 2.76E-02 O.OOE+-O0 0.00E+00 l.67E-02 O.OOE+O0 4.64E-02 O.OOE+00O

-1.24E-02 O.00E+O0 0.00E+00

-1.57E-02 1.44E-02 0.00E-I00 l.37E-O1 6.00E-02 1.38E-02 O.OOE÷IO0 1.15E-02 5.10E-02 0.OOE+00 O,00E+O0 U-235 2 a Error pCi/g 1.67 E-02 5,56E-02 5.52 E-02 2.03E-02 2.95E-02 3.36E-02 O.00E+00 6.61E-02 2.78E-O2 2.48E-02 3.00E-02 0.OOE+00 2.23E-02 2.88E-02 O,00E+00 1.60E-O1 6.07E-O2 2.7.6E-02 9.72E--03 3.97E-02 6.25E-02 0.00E+00 M DA pCi/g 6.58E-02 7.21E-02 4.07E-02 3.95E-02 5.60E-02 2.47E-O2 5.43E-02 3.42E-02 9.34E-O2 9.78E-O2 5.43E-02 5.38 E-02 8.80E-O2 2.12E-02 6.42E-02 6.74E-02 2.21E-02 2.03E-02 2.34E-02 5.34E-02 5.94E-02 6.88E-02 Activity pCifg U-238 2 a Error pCi/g 2.77E-01 1.61E-01 6.37E-02 7.39E-02 1,41E-01 1.21E-01 0.00E+O0 O.00E+O0 6.14E-02 8.71E-O2 2,34E-01 1.22E-01 1.49E-01 1.36E-01

-1.95E-02 2.28E-02 1.86E+00 6.85E-01 3.45E-01 2.15E-01 3.56E-O1 2.21E-01 2.95E-02 5.92E-02 7.25E-02 8.52E-02 3.45E-02 4.88E-02 O.00E+0O 0.00E+O0 O.00E+00 1.53E-02 2.18E-01 1.28E-01 2.42E-01 1.14E-01 2.57E-01 1,42E-O1 2.04E-01 1.06E-01 3.51E-01 1.32E-O1 2.39E-01 1.13E-O1 4.59E-02 5.33E-02 M DA pCi/g 1.19E-Q1 3.13E-02 8.67E-02 3,19E-02 4.53E-02 5.26E-02 4.39E-02 8.92E-02 3,15E-O1 1.37E-O1 1.42E-01 4.35E-02 8.72E-02 5.54E-02 5.19E-02 5.45E-02 1.13E-01 7.83E-02 1.34E-01 9.65E-02 8.32E-02 1.76E-02 4.07E-02 1.14E-02 2.36E-02 Page 5 of 6

Sample Number L4BKG01B.JGSSSA22 L4BKGOIBJGSSSA23 L4BKGO1BJGSSSA24 L4BKGO1BJGSSSA25 L4BKGO1BJGSSSA26 L4BKGOIBJGSSSA27 L4BKGO1BJGSSSA28 L4BKGO1BJGSSSA29 L4BKGO1BJGSSSA30 Activity pCi/g U-234 2 a Error pci/g M DA pCi/g 6.34E-01 2.73E-01 1.58E-01 2.67E-01 1.12E-01 7.03E-02 1,48E-02 5.13E-02 6.90E-02 4.37E-01.

1.65E-01 1.04E-01 1.53E-01 6.71E-02 1.96E-02 1.41E-02 4.89E-02 6.57E-02 2.24E-02 7.26E-02 9.41E-02 1.85E-01 8.61E-02 5.80E-02 1.56E-O1 8.21E-02 4.75E-02 Activity pCi/g 9.34E-02 1.09E-03

-1.83E-02 1.59E--02 7.70E-03 O.OOE+0O 0.00E+00 0.00E+00

-9.72E-03 U-235 2 a Error pCi/g 1.08E-01 2.94E-02 3.66E-02 5.50E-02 l.55E-02 1.13E-02 2.72E-02 O.OOE+O0 1.38E-02 MDA pCi/g 4.59E-02 5.50E-02 8.53E-02 7.40 E-O2 1.14E-02 8.13E-02 6.24E--02 1.39 E-02 4.80E-02 Activity pCi/g 4.01 E-01 1.66 E-O1 O.OOE+O0 2.83E-01 1.53E-01 7.05E-02 1.71E-01 1.64F-01 1.77E-01 U-238 2 a Error pCi/g 2.39E-01.

8.74E-02 9.25E-03 1.42E-01 6.71E-02 6.33E-02 1.54E-01 7.64E-02 8.66E-02 MDA pCij/g 2.37E-01 5.45E-02 2.18E-02 1.20E-01 1.96E-02 2.08E-02 5.05E-02 2.37E-02 3.88E-02 2.03E-01 1.74E-i00 3.23E-01 MEAN MAX STDEV 1.40 E-02 1.37E-01 3.24E-02 MEAN MAX STDEV 2.11E-01 1.86E+00 3,.24E-01 MEAN MAX STDEV Page 6 of 6

SAMPLE ANALYSIS RESULTS FOR SELECT RADIONUCLIDES - SUB SURFACE SOILS Sample Number L4BKG01BJGSBSA01 L4BKGO1QJGSBSAO1 L4BKG01BJGSBSA02 L4BKG01BJGSBSAO3 L4BKG01BJGSBSA04 L4BKG01BJGSBSAO5 L4BKGO1BJGSBSA06 L4BKGO1BJGSBSAO7 L4BKG01BJGSBSA08 L4BKGO1BJGSBSAO9 L4BKG01BJGSBSA10 L4BKG01BJGSBSA11 L4BKGO1BJGSBSA12 L4BKG01BJGSBSA13

• L4BK(GOIBJGSBSA14 L4BKGOIBJGSBSA15 L4BKG01BJGSBSA16 L4BKGOIQJGSBSA16 L4BKGO1BJGSBSA17 L4BKGOIBJGSBSA18 L4BKGO1BJGSBSA19 L4BKG01BJGSBSA2O L4BKG01BJGSBSA21 I.

K-40 Activity 2aoError pCi/g pCi/g 6.30E+00 9.26E-01 6.80E+0O 9.S5E1-O1 6.82E+i0O 8.35E-01 6.41E+00 9.13E-01 5.75E+I00 8.92 E-01 5.79E+00 1.05E+00 4.48E+00 8.07 E-01 5.56E+00 8.92E-01 6,41E+00 1.20E+00 6.09E+O0 8.19E-01 5.17E+00 8.84E-01 8.04E+OO 1.08E+00 7.12E+O0 1.03E+00 6.23E+O0 1.O8E-i00 6.90E+OO 7.14E-01 6.92E+O0 9.77E-01 6.16E+0O 8.69E-O1 6.45 E+0O 8.32E-O1 7.13E+0O 8.63E-01 8.59E+00 8.72E-01 5,34E+O0 9.04E-O1 6.75E+00 1.02E+OO 7.24E+00 9.34E-01 MDA pCi/g 2.47E-O1 3.86E-01 4.03E-01 2.80E-01 4.21E-01 4.90E+00 3.03E-O1 4.22E-01 5.33E-01 2.65E-01 3.16E-01 3.45E-O1 1.46E-O1 4.57E-O1 1.45E-O1 3.60E-01 2.58E-O1 3.85E-01 2.80E-O1 3.14E-O1 3.86E-O1 2.03E-O1 3.06E-O1 Sr-90 Activity 2 o Error MDA pCi/g pCi/g pCi/g 4.99E-03 2.70E-02 5.30E-02 2.21E-02 3.41E-02 6.48E-02 1.67E-02 2.94E-02 5.61E-02

-2.3 1E-02 2.59E-02 5.48E-02

-1.35E-02 2.84E-02 5.83E-02

-2.68E-02 2.78E-02 5.90E-02 2.50E-03 3.24E-02 6.42E-02

-1.10E-03 2.46E-02 4.90E-02 9.76E-03 2.76E-02 5.35E-02

-5.47E-03 2.59E-02 5.23E-02

-5.13E-03 3.37E-02 6.77E-02

-2.42E-04 2.77E-02 5.51E-02 9,04E-03 3.02E-02 5.88E-02

-2.03E-02 2.17E-02 4.63E-02 2.59E-04 2.54E-02 5.03E-02

-1.39E-03 2.36E-02 4.71E-02

-1.3DOE-02 4.77E-02 7.95E-02

-4.08E-02 4.96E-02 8.45E-02 1.97E-02 2.26E-02 3.46E-02 4.96E-02 5.45E-02 8.42E-02 5.30E-02 6.31E-02 9.76E-02 7,97E-03 5.47E-02 8.91E-02

-2.1BE-02 5.30E-02 9.03E-02 Activity pCi/g Co-60 2 a Error pCi/g 1.92E-02 2.88E-02

-9.67E-03 2.79E-02

-1.34E-02 2.89E-02

-8.91E-03 2.99E-02 6.79E-03 2.48E-02

-1.59E-02 3.19E-02

-1.26E-02 3.06E-02

-4.69E-03 2.77E-02

-1.08E-02 3.70E-02

-9.42E-04 2.18E-02 3.22E-03 2.91E-02 1.25E-02 3.53E-02 9.58E-05 3.10E-02

-2.54E-02 3.74E-02 1.18E-02 2.03E-02

-3.15E-04 2.60E-02 1.7OE-02 2.63E-02

-3.89E-03 2.29E-02 3.98E-03 2.14E-02 2.89E-03 1.82 E-02 3.79E-D2 2.97E-02

-8,81E-03 3.20E-02

-2.43E-02 2.59E-02 M DA pCi/g 5,,24E-02 4.44E-02 4.43E-02 4.67E-02 4,22E-02 4,61E-02 4.81E-02 4.44E-02 5.87E-O2 3.61E-02 4.83E-02 6.09E-02 5.21E-O2 5.57E-02 3.64E-02 4.20 E-O2 4.87E-02 3.62E-02 3.71E-02 3.09E-02 5.93E-02 5.03E-02 3,42E-02 Cs-137 Activity 2 a Error pCi/g pCi/g 1.98E-02 2.19E-02 1.59E-02

-1.20E-02 1.94E-02

-6.27E-03 4.61E-03 5.09E-03

-6.13E-03

-3.70E-03

-2.22E-02 1.1OE-02 1.32E-02 1.13E-02 9.30E-03

-2.27 E-03 1.05E-01

-6.13E-03 4.03E-02

-6.63E-03 5.66E-03

-4.67E-03 1.26E-03 2.95E-02 2.56E-02 2.87E-02 2.88E-02 2.66E-02 3.07E-02 3.00E-02 2.57E-02 4.11E-02 2.17E-02 2.69E-02 3.14E-02 3.07E-02 3.51E-02 2.26E-02 2.50E-02 4.10E-02 2.52E-02 3.86E-02 2.07E-02 2.80E-02 3.38E-02 2.65E-02 MDA pCi/g 5.29E-02 4.66E-02 5.O0E-02 4.46E-02 4.84E-02 5.02E-02 5.09E-02 4.33E-02 6.52E-02 3.52E-02 3.91E-02 5.48 E-02 5.27E-02 5.91E-02 3.89E-02 4.11E-02 4.46E-02 3.98 E-02 3.73E-02 3.30E-02 4.77E-02 5.46E-02 4.31E-02 Page 1 of 6

Sample Number L4BKGOIBJGSBSA22 L4BKGOIBJGSBSA23 L4BKGO1BJGSBSA24 L4BKGO1BJGSBSA25 L4BKG01BJGSBSA26 L4BKG01BJGSBSA27 L4BKG01BJGSBSA28 L4BKG01BJGSBSA29 L4BKG01BJGSBSA30 K-40 Activity 2 o Error MDA pCi/g pCi/g pCi/g 7,73E+00 1.002+00 2.92E-01 5.44E+00 1.11E+00 3.192-01 8.28E+00 9.91E-01 2.69E-01 7.82E+00 7.84E-01 2.86E-01 7.29E+00 7.71E-01 2.51E-01 5.96E+00 8.142-01 1.19E-01 7.47E+O0 9.46E-01 4.20E-01 7.33E+00 1.17E+00 2.78E+00 6.17E+00 1.39E+00 5.37E-01 Activity pCi/g

-7.22E-04 1.23E-02 3.88E-02

-3.25E-03 2.49E-03 1.04E-02 4.79E-02 9.44E-03 3.43E-04 Sr-90 2 o Error pCi/g 1.84E-02 1.32E-02 2.58E-02 1.50E-02 1.52E-02 2.84E-02 4.98E-02 1.26E-02 1.23E-02 MDA pa/lg 3.05E-02 2.45E-02 4.59E-02 3.02E-02 2.99E-02 5.50E-02 9.29E-02 2.37E-02 2.44E-02 Co-60 Activity 2 a Error pCi/g pCi/g M DA pCi/g

-7.792-03 2.78E-O2 4.34E-02 1.44E-02 2.51E-02 5.01E-02

-5.58E-03 2.92E-02 4.71E-02

-1.262-02 2.00E-O2 3.06E-02 3.57E-03 2.03E-02 3.47E-02 1.97E-03 2.48E-02 4,06E-02 5.69E-03 3.04E-02 5.13E-02 1.60E-02 2.62E-02 5.03E-02 2.05E-02 2.81E-02 5,52E-02 Cs-137 Activity 2 o Error pCi/g pCifg 4.81E-03 3.36E-02 2.14E-01 6.89E-02 1.62E-02 2.87E-02 1.17E-03 2.25E-02

-1.54E-02 2.29E-02 1.07E-01 4.10E-02 2.41E-01 6.45E-02 4.50E-02 3.59E-02 1.61E-02 3.33E-02 M DA pCi/g 5.53E-02 4.78E-02 5,08E-02 3,67E-02 3.52E-02 4,65E-02 5.O1E-02 6.81E-02 5.74E-02, I ______________________________

L 6.622+00 MEAN 8.59E+OO0 MAX 9.49E-01 STDEV 4.40E-03 5.30E-02 2.16E-02 MEAN MAX STDEV 3.72E-04 MEAN 3.79E-02 MAX 1.38E-02 STDEV 2,64E-02 2.41E-01 6.00E-02 MEAN MAX STDEV Page 2 of 6

SAMPLE ANALYSIS RESULTS FOR THORIUM - SUB SURFACE SOILS Sample Number L4BKG01BJGSBSA01 L4BKG01QJGSBSA01 L4BKG01BJGSBSA02 L4BKG01BJGSBSA03 L4BKG01BJGSBSA04 L4BKGO1BJGSBSAO5 L4BKGOIBJGSBSA06 L4BKGOIBJGSBSA07 L4BKGO1BJGSBSA08 L4BKGO1BJGSBSA09 L4BKGOIBJGSBSAIO L4BKGOIBJGSBSA11 L4BKGOIBJGSBSA12 L4.BKGOIBJGSBSA13 L4BKGOIBJGSBSA14 L4BKGO1BJGSBSA15 L4BKGOIBJGSBSA16 L4BKGO1QJGSBSA16 L4BKGO1BJGSBSA17 L4BKGOIBJGSBSA18 L4BKGOIBJGSBSA19 L4BKGOIBJGSBSA20 L4BKGOIBJGSBSA21 Th-228 Activity 2 a Error pCi/g pCi/g MDA pCi/g 5.79E-02 8.20E-02 4.26E-02 1.99E-02 5.99E-02 9.66E-02 4.19E-02 4.63E-02 4.98E-02 3.30E-02 4.40E-02 3.42E-02 1.51E-O1 7.25E-02 4.35E-02 1.56E-O1 8.27E-02 6.79E-02 8.85E-02 9,03E-02 8.48E-02 3.38E-O1 1.88E-O1 1.79E-01 3.86E-02 5.50E-02 2.84E-02 3.43E-02 6.08E-02 5.69E-02 2.64E-01 1.50E-01 1,37E-01 3.03E-01 1.80E-01 1.30E-01 4.50E-01 2.42E-O1 1.96E-01 1.45E-01 1.01E-01 6.90E-02 6.07E-02 8,65E-02 4.47E-02 3.64E-01 1.41E-01 8.03E-02 7.17E-02 7.99E-02 5.38E-02 1.78E-01 1.11E-O1 1.14E-01 2.25E-01 1.28E-01 1.41E-01 7.18E-02 8.96E-02 8.43E-02 2.95E-02 5,47E-02 8.45E-02 2.02E-O1 1.17E-01 7.58E-02 3.17E-02 7.30E-02 9.43E-02 Activity pci/g 6.74E-01 7.79 E-02 4.51E-01 2.83E-01 2.64E-01 3.34E-01 2.40E-O1 3.69E-01 5.34E-01 6.29E-01 3.98E-01 8.11E-01 3.99E-01 3,68E-01 5.60E-01 7.80E-01 5.15E-02 2.39E-01 5.07E-01 9.99E-02 3.74E-01 2.68E-01 7.35E-03 Th-230 2 o Error pCi/g 3.04E-O1 7.08E-02 1.27E-01 1.20E-01 9.53E-02 1.19E-01 1.40E-O1 1.78E-O1 2.20E-01 2.52E-01 1.72E-O1 2.95E-O1 2.20E-01 1.62E-01 2.80E-01 2.18E-01 6.87E-02 1.16E-01 1.66E-01 9.76E-02 1.32E-01 1,30E-O1 5.36E-02 M DA pCi/g 2.08 E-01 2.30E-02 5.5 1E-02 1t83E-02 1.93E-02 5.49E-02 9.70E-02 9.26E-02 2.81E-02 5.64E-02 1.01E-01 5.76E-02 1.59E-01 7.89E-02 8.25E-02 6.28E-02 5.33E-02 7.61E-02 7.54E-02 5.90E-02 8.36E-02 3.75E-02 9.34E-02 Activity pCi/g 1.62E-01 4.67E-02 1.32E-O1 4.50E-02 1.31lE-Ol 1.79E-01 4.6BE-02 2.39 E-01 3.81E-02 4.10E-02 4.05E-01 2.24E-01 i.42E-O1 1.91E-O1 1.40E-01 3.38E-O1 1.94E-02 2.02E-O1 1.92E-01 4.30E-02 7.77E-02 2.14E-01 0.OOE+O0 Th-232 2 a Error pCi/g 1.43E-01 6.45E-02 7.02E-02 5.01E-02 6.44E-02 8.12E-02 6.25E-02 1.50E-01 5.43E-02 5.85E-02 1.67E-O1 1.45E-01 1.18E-01 1.13E-O1 1.38E-O1 1.29E-O1 3.88E-02 1.04E-01 1.04E-01 6.09E-02 5.80E-02 1.15E-O1 0.00E+00 MDA pCi/g 7.86E-02 2.30OE-02 2.47 E-02 3.38E-02 1.93E-02 1.20E-02 4.85E-02 1.20E-01 2.81E-02 3.03E-02 4.5 1E-02 5.76 E-02 3.48E-02 5.58E-02 8.25E-02 1.51E-02 2.86E-02 4.82E-02 6.75E-02 3.17E-02 2.79E-02 3.75E-02 3.55E-02 Page 3 of 6

Sample Number L4BKGO1BJGSBSA22 L4BKGOIBJGSBSA23 L4BKGO1BJGSBSA24 L4BKGO1BJGSBSA25 L4BKGO1BJGSBSA26 L4BKGO1BJGSBSA27 L4BKGO1BJGSBSA28 L4BKGO1BJGSBSA29 L4BKGO1BJGSBSA30 Activity pCi/g 9.22E-02 4.52E-02 2.39E-02 5.52E-02 6.53E-02 1.49E-O1 4.75 E-03 8.11E-02 1.56E-01 Th-228 2 a Error pCi/g 9.35E-02 5.47E-02 4.80E-02 7.80E-02 7.08E-02 7.76E-02 3.27E-02 6.37E-02 7.73E-02 MDA pCifg 3.40E-02 5.95E-02 3.52E-02 8.86E-02 9.15E-02 5.O1E-02 6.05E-02 4.85 E-02 1.09E-01 Activity pCi/g 1.75E-01 1.79E-O1 1.10E-01 1.35E-01 3.84E-01 2.48E-O1 6.02E-02 2.35E-01 2.66E-01 Th-230 2 a Error pCi/g 1.33E-01 9.52E-02 1.09E-O1 1.06E-O1 1.40E-O1 9.77E-02 4.82E-02 1.06E-O1 7.45E-02 MDA pCi/g 6.26E-02 7,22E-02 6,49E-02 7.16 E-02 9.06E-02 2.22E-02 3,20E-02 3.92E-02 3.92E-02 Activity pCi/g

-7.92E-03 4.47E-02 3.91E-02 9.22E-02 9.47E-02 1.27E-01 7.42E-02 7.02E-02 1.04E-01 Th-232 2 a Error pCi/g MDA pCi/g 1.59E-02 6.26E-02 4.78 E-02 4.17 E-02 6.92E-02 6.49E-02 8,28E-02 2,72E-02 7.15E-02 6,04E--02 6.77E-02 2.22 E-02 5.07E-02 1.22 E-02 5.93E-02 4.80E-O2 4.88E-02 3.92E-02 I

L ______________________________________

I.

1,26E-01 4.50E-01.

1.14E-01 MEAN MAX STDEV 3.28E-O1 8.11E-01 2.09E-01 MEAN MAX STDEV 1.21E-01 4.05E-01 9.54E-02 MEAN MAX STDEV Page 4 of 6

SAMPLE ANALYSIS RESULTS FOR URANIUM - SUB SURFACE SOILS Sample Number L4BKGO1BJGSBSA01 L4BKGO1QJGSBSA01 L4BKGO1BJGSBSAO2 L4BKG01BJGSBSA03 L4BKG01BJGSBSAO4 L4BKG01BJGSBSA05 L4BKG01BJGSBSA06 L4BKG01BJGSBSA07 L4BKG01BJGSBSA08 L4BKGOIBJGSBSA09 L4BKG01BJGSBSA10 L4BKG01BJGSBSA11 L4BKGOIBJGSBSA12 L4BKGO1BJGSBSA13 L4BKG01BJGSBSA14 L4BKGO1BJGSBSA15 L4BKGO1BJGSBSA16 L4BK(GOICJGSBSA16 L4BKG01BJGSBSA17 L4BKG01BJGSBSA18 L4BKGOIBJGSBSA19 L4BKGO1BJGSBSA20 L4BKG01BJGSBSA21 U-234 Activity 2 o Error pCi/g pCi/g M DA pCifg Activity pci/g 3.06E-02 6.14E-02 4.52E-02 O.OOE+00 4.61E-02 8.13E-02 7.66E-02

-1.79E-02 2.54E-02 9.99E-02

-1.09E-02 2,19E-02 8.64E-02 5.86E-02 7.83E-02 6.07E-02 4,38E-02 8.80E-02 6.46E-02 4.74E-02 8.39E-02 7.87 E-02 0OOE+00O 2.26E-02 6.54E-02 7.36E-01 4,07E-01 3.23E-01 6.85 E-02 6.69E-02 4.05E-02 3.O1E-01 1.55E-O1 8.43E-02 5.19E-02 6.48E-02 6.10E-02 8.09 E-02 7.6 1E-02 7.93 E-02 3.85E-02 5.14E-02 3.98E-02 0.OOE+O0 0.00E+00 4.29E-02 2.00E-02 6.49E-02 8.41E-02 2.59E-01 1.21E-01 1.09E-01 4.68E-01.

1.60E-01 9.22E-02 2.38E-01 1.17E-O1 1.O9E-01 1.69E-01 9.99E-02 9.79E-02 2.00E-01 1.33E-01 1.43E-01 1.57E-02 5.46E-02 7.34E-02 5.44E-02 6.54E-02 7.17E-02 O.OOE+OO

-1.11E-02 O.OOE+O0 0,0OE+00 0.OOE+0O

-1.23E-02 O.OOE+O0 1.1OE-01 5.56E-03 2.19E-O2 1.94E-02 2.64E--02 1.17E-02

-1.25E-02 0.OOE+0D 1.19E-02 1.41E-02 2.35E-02

-1.16E-02 1.55E-02 O.OOE+O0 4.04E-02 U-235 2 o Error pCi/g 2.79E-02 2,93E-02 2.22E-02 2.84E-02 1,86E-02 0.O0E+00 2.47E-02 2.79E-02 1,56E-01 4.06E-02 4,39E-02 3.89E-02 4.66E-02 3.80E-02 2.51E-02 O.OOE+O0 2.37E-02 6.32 E-02 3.33 E-02 4.02E-02 3.09E-02 O.OOE-I00 4.67 E-02 MDA pCi/g 5.58E-02 5.08E-02 8.75E-02 5.73E-02 4.03E-02 7.99 E-02 9.73E-02 8,09E-02 8.10E-02 7.07E-02 3.23E-02 2.86E-02 4.39E-02 4.92E-02 9.88E-02 5.58E-02 1.75 E-02 9.3 1E-02 1.74E-02 7.65E-02 2.28E-02 2.87E-02 1.98E-02 Activity pCi/g O.OOE+O0 O.00E+00 4.26E-02 2.05E-02 0.OOE+00 0O.OE+00) 1.72E-01 0OE+0O 6,65E-01 2,43E-02 2.88E-01 9.42E-O2 7.30E-02 1.89E-02 1.46E-01 6.12E-02 3.07E-01 3.20E-01 2.38E-01 2.25E-O1 3.38E-01 4.72E-02 3.27 E-02 U-238 2 a Error pCi/g 0.00E+O0

.0.OOE+00 7.52E-02 6.66E-02 1.51E-02 0.00E+00 1.44E-01 2.26E-02 3.69E-01 4.30E-02 1.56E-01 7.74E-02 6,42E-02 4.35E-02 1.33E-01 8.74E-02 1.20E-01 1.46E-01 1.07E-01 1.10E-01 1.45E-01 5.5 1E-02 4.87E-O2 MDA pci/g 4.52E-02

4. 11E-02 7.O8E-02 8,64E-02 3.26E-02 6.46E-02 4.23E-O2 6.54 E-02 2.11E-01 4.05E-02 1.09E-O1 2.32E-02 3.55E-02 5.63E-02 4.29E-02 4.52E-02 7.74E-02 1.30 E-01 7.69E-02 9.79E-02 1,01E-Ol 2.32E-O2 5,07E-O2 Page 5 of 6

Sample Number L4BKGO1BJGSBSA22 L4BKGOIBJGSBSA23 L4BKGO1BJGSBSA24 L4BKGO1BJGSBSA25 L4BKG01BJGSBSA26 L4BKGO1BJGSBSA27 L4BKGO1BJGSBSA28 L4BKG01BJGSBSA29 L4BKGO1BJGSBSA30 U-234 Activity 2 a Error pCi/g pCi/g MDA pci/g 9.36E-O2 7.11E-02 1.97E-02 4.79E-02 4.80E-02 1.77 E-02 1.64E-O1 9.91E-02 9.25E-02 2.42E-01 9.72E-02 6.76E-02 1.42E-O1 7.87E-02 6.62E-02 1.75E-01 8.74E-02 4.03 E-02 1.86E-O1 7.99E-02 5.30E-02 5.28E-02 6,59E-02 6.21E-02

-1.04E-02 2.07E-02 8.19E-02 Activity pCi/g" 4.96E-02

-2.96E-02 7.47E-03 8.86E-04 5.35E-03 2.26E-02 0.00E+IO0 2.58E-02 0,00E+O0 U-235 2 o Error pCifg M DA pCi/g 7.40E-2 7.71E-02 4.19E-02 9.76E-02 3.02E-02 4.32E-02 2.39E-02 4.47 E-02 2.16E-02 3.09E-02 3.22E-02 1.67E-02 0.00E+00 1.17E-02 5.92E-02 7.67E-02 2.84E-02 5.43E-02

• Activity pCi/g 1.34E-02 2.40E-02 2.29E-01 1.96E-01 1.73E-01 2.11E-01 1.66E-01 6.81E-02 0.00E+00 U-238 2 o Error pCi/g 4.63E-2 3.39E-02 1.08E-01 8.55E-02 8.43E-02 9.67E-02 7.40E-02 8.23E-02 0.00E+00 MDA pCi/g 6.23E-2 1.77E-02 6.05E-02 5.11E-02 5.59E-02 4.03E-02 4.48E-O2 9.81E-02 4.40E-02 1.25E-O1 MEAN 7.36E-01 MAX 1.57E-O1 STDEV 1.05E-02 1.10E-01 2.43E-02 MEAN MAX STDEV 1.31E-01 6.65E-01 1.47E-0I.

MEAN MAX STDEV Page 6 of 6

a ZionSolutions, Inc.

EH&S Technical Support Document ZIONSOLUTIONS*

TSD # 13-004 Examination of Cs-I137 Global Fallout In Soils At Zion Station Revision 00 Harve*(F~rr -JRSCS Radiological Engineer Originator:

Date:

_,__,_/____/

I Reviewer:

?J4, o

• ,L.*

Date:

• /

.-9/13 Robert Deckder - ZionSolutions LTP Radiological Engineer Approval:

Date:

Steve Horvath - Zoo lutos aracterization/License Termination Manager

EH&S TSD # 13-004 Revision 00 Page 2 of 38 1.0 Introduction This TSD provides a review of information from published global fallout studies and Zion Solutions soil sample data. The TSD establish the technical basis for anticipated soil concentrations attributable to fallout and establishes criteria for investigating soil Cs-I137 concentrations that are higher than those anticipated due to word-wide fallout.

2.0 Table of Contents 1.0 Introduction............................................................................................. 2 2.0 Table of Contents......................

................................................................ 2 3.0 Background............................................................................................. 2 4.0 Definitions............................................................................................... 2 5.0 Calculations and Evaluations.......................................................................... 2 5.1 Background Cs-I137 Levels from Nuclear Weapons Testing........................................ 2 5.2 Background Cs-I137 Levels in Zion Soils............................................................ 15 6.0 Conclusion............................................................................................ 26 7.0 Attachments........................................................................................... 26 7.1 Attachment A - Zion Site Layout with Future ISFSI Location...................................... 27 7.2 Attachment B - All Soil Sample Results Background Studies and Class 3 Southwest Survey Units................................................................................................... 27 8.0 References............................................................................................ 27 3.0

Background

For confirmation surveys of non-impacted land areas and MARSSIM Class 2 and 3 land areas it is important to distinguish licensed materials originating from facility operations from world-wide fallout in order to establish reasonable action levels requiring further investigation. In order to establish investigation criteria indicative of Cs-I137 contamination levels in soil that are distinguishable from background levels, a review of predicted fallout levels and results of studies is provided and Zion Solutions soil sample results for Cs-137 in soils to date are compared to those anticipated from world-wide fallout based upon the literature.

4.0)

Definitions Investigation criterion-An activity limit at which further evaluation of the survey data is required for a MARSSIM Class I survey area. The investigation criterion is typically set at a value that ensures that the DCGLEMc will not be exceeded. [I]

World-Wide Fallout - The descent and deposition of radioactive material in the atmosphere onto the earth following a nuclear explosion, incident, or accident.

5.0)

Calculations and Evaluations 5.1 Background Cs-I 37 Levels from Nuclear Weapons Testing As noted in a "Historical Overview of Atmospheric Nuclear Weapons Testing and Estimates of Fallout In the Continental United States" by Beck and Bennet [2]. from 1945 to 1980, over 500 weapons tests were conducted in the atmosphere at a number of locations around the world.

These tests resulted in the release of substantial quantities of radioactive debris to the environment. The amount of fallout and its geographical distribution was a function of the location, yield, height of burst, and meteorological conditions associated with the various tests.

[2] As seen in Figure I only Cs-I137 is readily detectable by gamma spectroscopy and has a long enough half-life to remain present in the environment from fallout.

EH&S TSD # 13-004 Revision 00 Page 3 of 38 Nuclide Half-lifc PBq MT-'

P~lq Fission products:

'37Cs 30.2 y 5.9 950

'*r28.8 y

3.9 620

• °Ru 374 d 76 12,200 1Ce285(d 191 30,700)

'JZr 64 d 921 148,000 1Ba12.8 d

4730 759,000 J~l8.0(d 4210 675,000

'3"Te 3,3 d 10,500 1,700,000 Activation products:

4C 5,730 y

-0.85

'-213 31112.3 y

'-740

'-186,000 54Mn 312 d 15.9 3,980 23h2Ou24,110 y I1 Tracers:

x5*W 74 d 11,000 Figure 1 - Beck Summary of Some of the More Important Fission and Activation Nuclides Produced In Weapons Tests ["2].

As Beck and Bennet point illustrate in Figure 2, Cs-137 fall out is predominantly from nuclear weapons tests in comparison to accidental releases from accidents such as Chernobyl and Windscale.

Evenlt

'37Cs i3t11 239 +240pu All weapons testsa 950 675,000

-11 NTS tests"'t' 7

5,400

-0.5 Chernobyl accident"'

85 1,.760

-0.1I Hanford releasesc 27 Windscale accidentd' 0.02 0.74 a1 UNSCEAR (2000).

t, Beck (2001Ia).

TSP (1994).

,' UJNSCEAR (1993).

Figure 2 - Activity of 0s-137, 1-131, and Pu-239, 240 (PBq) produced by atmospheric weapons tests compared with reported releases that occurred as a result of accidents or production of fuels.

Deposition of cesium from fallout peaked in the United States in the mid-i1960's and contributions following 1980 are generally insignificant. The possible exception was depositions resulting from the Chernobyl nuclear reactor accident in 1986. However, while small increases could be measured in the United States, the increases were not significant in comparison to depositions from weapons testing fallout. [3] A PBq (petabecquerel) is 1015 Bq.

Estimates of the Cs-137 released into the atmosphere from the March 2011 Fukushima Daichii accident range from 13 x 1015 Bq (13 PBq) up to 50 x 1015 Bq (50 PBq) [4]

Thus Cs-I137 fallout in the U.S. is still predominantly from nuclear weapons testing in comparison to releases from nuclear accidents. Most of the fallout in the eastern United States from Nevada tests resulted from precipitation scavenging when the fallout clouds intersected rain clouds. [21 In the fall of 1951 the Health and Safety Laboratory (HASL) established a network of fixed stations throughout the world using a semiquantitative system based on deploying trays filled with water and/or trays of gummed film at weather stations. The gummed film and precipitation sampling provided estimates of daily or weekly deposition at a fairly large number of sites and allowed estimates to be made of the total global deposition. [2]

EH&S TSD # 13-004 Revision 00 Page 4 of 38 Fallout data is typically reported as activity per unit surface area (e.g., Bq/m 2, nCi/m2, etc.).

Note that I Bq equals approximately 27 pCi. This provides a more accurate depiction of the total deposition since the results are not influenced by the density of the soil or other medium on which the fall out deposits. In addition, results reported as activity per surface area are not influenced by the rate at which the nuclide migrates through the soil to as great an extent as typical environmental sample measurements based upon activity per unit mass. For example, two different locations with identical depositions in Bq/m 2 could have drastically different soil concentrations if one's soil was rich in organic material, and thus had a lower bulk density, and the other was clay like or sand like material, with a high bulk density. Even if the nuclide was distributed to the same depth, the difference in the densities of the soil types would yield different soil concentrations in pCi/g.

Estimates of Nevada Test Site (NTS) fallout depositions were confirmed by large-scale soil sample surveys carried out by HASL and U.S. Department of Agriculture (USDA) investigators. Large-scale soil sampling was carried out every few years beginning in the early 1950's with the last survey occurring in the late 1960's. Generally about 50 to 100 sites were sampled during each survey. Over 500 samples were collected over the testing period. Many sites were resampled several times allowing estimates to be made of the deposition since the previous sampling. The samples were at first analyzed only for Sr-90. Many of the early samples were retained at HASL and later reanalyzed for long-lived radionuclides, such as plutonium isotopes and Cs-1 37. [2] The total deposition of Sr-90 from all tests as a function of latitude, based on the soil sample and deposition data, is shown in Figure 3. As can be seen, the deposition varied with latitude, peaking in the 40 to 50 degree north latitude band. This apparently reflects preferential stratospheric to troposphere transfer at the mid latitudes.

Sr-40 Deposition 100 40

<~-N. Degrees Latitude S->

Figure 3 - Variation of total Sr-90 deposition with latitude. [2]

It also reflects the fact that most of the debris was injected into the stratosphere in the northern hemisphere, and that the transfer from the northern hemisphere to the southern hemisphere is very slow. About 460 PBq of the estimated total 604 PBq of Sr-90 deposited globally was

EH&S TSD # 13-004 Revision 00 Page 5 of 38 deposited in the northern hemisphere. Zion Illinois has a latitude of 42.44610° N which corresponds to the latitude with the highest fallout deposition.

'E Z0

$otitheiTr"h*ni*he*'e lmm*mqwm p

m Figure 4 - Cesium-I137 deposition density in the northern and southern hemispheres [5]

As seen in Figure 4 Cs-I137 fallout peaked in the 1963 to 1964 time frame in the 40 to 50 degrees north latitude region of the northern hemisphere. UNSCEAR [5] reports provide estimates of total deposition of various radionuclides from global fallout. While such reports are suitable for estimating the overall or average hemispheric impact, they do not reflect the actual geographical variation across the continental United States. [2] It is well established that the major mechanism for the deposition of global fallout was precipitation scavenging and rainout. Numerous studies demonstrated that in any particular area the deposition was generally proportional to the amount of rain experienced. [2] Fallout depositions vary longitudinally across the Continental U.S. due to washout and rainfall patterns. Zion is located at 87.83280 W longitude and would have a correction factor of 0.8 for NTS related fallout. [2]

Longitude (degrees west)

Latitude 60-90 90-1I00 100-110 I110-120

> 120 25-30 0.45 0.45 0.6 0.5 0.5 30-35 0.6 0.65 1.2 1.0 0.7 35--40 0.8 0.9 1.5 2.0 0.8 45.-45 1.0 IJ 1.6 1.9 0.6 45-50 0.8 0.85 0.9 1.0 0.5 Figure 5 - Estimated Longitudinal Variation in NTS Fallout by Longitude Over the United States

[2]

This does not account for variation in fallout deposition patterns for non-NTS weapons testing global fallout.

Local or regional measurements of Cs-I137 are typically compared to baseline estimates of Cs-137 concentrations world-wide which are calculated from deposition measurements of Sr-90.

EH&S TSD # 13-004 Revision 00 Page 6 of 38 These estimates use a well-established Cs-I137 to Sr-90 deposition ratio of 1.6 for fallout. [3]

Table 2.1 (Figure 6 of this TSD) of a 1994 report on Cs-137 distributions in residential areas

[3] provides such estimates of Cs-I137 depositions by latitude integrated to 1980 and decay corrected to 1991.

Table 2.1 Estimates of Potential Cs-137 Concentrations in Soils by Latitude and Assulned Depth of Distiibution Concentrtions if distributed from LATUTUDE BA*ND Dem'ees 70-SON 60-70N 50-60N 40-50N 30-40N 2 0-30ON 1o-20N I0-20S20-30OS 30-408 40-5SO 50-608 60-705 70-S0S Deposition (a)

Cs-13 7 Bq/cm2 (pCi/cmi2) 0.11 2.'9 0 to 5cm (b) 0 to 30cm (b) p)Clig (B~q/Kg) pciig (Bq/Kg)

'0.20 7.4 0.03 1.2 0.28 0.46

'0.52 0.37 0.28 0.19

'0.13 0.08 0.07 0.11 0.12 0.14 0.08 0.06 0.04 7.5 12.5 14.0 1*0.1 7.6 5.1 3.5 2.1 1.8 3.0 3.3 3.8 2.0 1.5 1.0 0.51 0.85 0.9;4 0.68

'0.52' 0.35 0.24

0.14

,0.12 0:20 0.22 0.26 0,14 0.10 0.06 15.8

'31.3 35.0 25.3 19.2

.12.9 4:5 5.2 9.6 5.1 3.8 2.4 0.08 0L14 0.16 0.11 0.09 0.06

.0.04

'0.02 0.02 0.03 0.04 0.04 0.02 0.02 0.0*1 3.1 5.2 5.8 4.2 3.2 2.1 1.5 0.9 0.8 1:3 1.4 1.6 0.8 0.6 0.4 (a) Cs-137 Deposition estimnate from Sr-90 assimunig a ratio of 1.6 Cs-137 to St-90 integrated to 1980 (b) Soil concentration estimated assumfing an average soil density of 1.6 g/cm3 and the deposition averaged over the entire depth. The values are corrected for decay to 1991.

Figure 6 - Estimated Soil Fallout Concentrations by Latitude Based Upon Estimates of Global Fall Out [3]

The calculated soil concentration in the 40 to 50 degrees north latitude where Zion is located is 0.16 pCi/g for a 0 - 30 cm core length of soil with a bulk density of 1.6 g/cm3. [3] As noted in the report, such generalized estimates of soil concentrations from global fallout do not adequately address the variations in actual fallout depositions and variability in Cs-I137 concentration and redistribution in the environment. [3] The authors of the referenced study [3]

state that within the region of interest (400 to 500 North Latitudes) and given normal soil variability, soil Cs-I137 concentration would be expected to range from about less than 0.2 pCi/g to 1 pCi/g. These estimates assume an average soil density of 1.6 g/cm3 which is reasonable for U.S. soils. However, soil density can vary significantly in local areas and may commonly range from about 1 to more than 2 g/cm3. Such variations can cause concentrations to vary several fold or more even with the same fallout depositions. For instance, varying the

EH&S TSD # 13-004 Revision 00 Page 7 of 38 soil density over this range changes the estimated range of Cs-I137 concentrations in the soils from 0.1 pCi/g to 2.0 pCi/g. However, cesium migrates slowly and is not evenly distributed by depth. Using Cs-I137 soil migration measurements, the study [3] predicted a up to 0.8 pCi/g [30 Bq/kg] in the first 0.5 cm of surface soil and about 0.1 pCi/g [3.7 Bq/kg] in soil at the 5 to 30 cm depth. [3]

The study from which the above information was obtained was published in 1994. [31 The study examined natural variation in fallout Cs-I137 concentrations in residential areas in comparison to the predicted range of concentrations of 0.1 to 0.8 pCi/g Cs-I137 concentrations from fallout. [3] The study data included about 600 sample locations from over 200 properties in central New York, 26 properties in Beverly, Massachusetts, and 10 properties in northeastern Pennsylvania. The specific sites reviewed in this study all are in the 400 to 500 North Latitudinal region as is Zion. All the data was decay corrected to 1991.As seen in Figure 7, for Central New York the range of and geometric mean of Cs-i137 concentrations were higher than the predicted 0.10. to 0.8 pCi/g range in drainage areas and the upper 95%

confidence levels of the non-drainage areas was 3 times higher than the predicted 0.8 pCi/g value. [3]

Table 3.1 - Colonie,.NY - Summary~ Cesium-137 in Soil Data and Statistics unitsp{L Aritlm~etic Measured Mean G3eometric Condition1! &

Number of Range

,(pCi/g) +

Meani Range (pCi/g) for.

Depth,(cni)

Samples (pCi/g)

(1 Sigmaa)

(p'Ci/g) 95% of Distmibtition Drainage.Areas All Samples 109

<0.01 - 12 2.1 +__2.1 0.94 10.05 - 17

'0-5 cm S3

<0.04 -11 2.1i +2__.4 1.1 i 0.09 -13 5--15 cm 12 0.4 122 2*.8+,3.3 1.7 0.23 -1.2

>15 cm 10

<0.010

<0.15:+._0.24 0.07 0.01 -0.75 Non-Drainage.Areas.

All Samuples 347

<0.01 - 4.4 0.66 +_ 0.70 0.39 0.05 - 3.3

'0-5 cm 277

<0.01 -4.4 0.74 +0.75 0.47 0.07-3.4 5-15.cm!

58

<0.01 -2.1 0.41+-*0.24 0.25 0.04 -L!9

>15 cm 17

<0.02-0.7'

<0.2-+0.21 0.12 0.01 -1.0 1-Conditions include drainage areas (locations that collect water) and nondrainage areas (open areas such as lawns and fields. 2 - Subsurface samples where [sic] taken from high concentration area, and, hence, are biased high in comparison to surface samples. 3 - About 40% of the samples contained cesium-I137 at levels below detectable limits.

Figure 7 - Colonie New York Residential Soil Concentrations The Beverly MA (Figure 8) and Luzerne County PA (Figure 9) data had somewhat lower geometric means and upper 95% confidence ranges. However they were still well above the predicted concentrations based upon overall world-wide fallout deposition in the 40 to 50 degree North latitude.

EH&S TSD # 13-004 Revision 00 Page 8 of 38 Table 3.2 - Be~verly MAL

- Cesinm 137 in Soil Summary Data and Statistics Units pCi/g

'Range (pCi/g for 95!%of Distribution Drainage A-rea s

-l A!Samples

____2__

0.02 -11 1.5 +2.4 0.53 0.02-11 0-15 cm 190,02-11 1.7+'2.7 0.63 j

0.04-11 15-30 cliii1 0.02 -4.6 1.1 + 1.6.

0,34 1

0.01 -9.0 N~n-Draina-,e Areas

.All Samples 195

<0.01 - 2.8 0.32 _+0.38 0.19 0.02 - 1.6 0-5 cui 1,04 0:04-2:8

.043._+ 0.41 0.31 0.06-1.6.

15-30 cm S4

<0.01 -2.5 0.19__+0.31 0.11 0.04-0.317

>30 cm

• 7 0.07-0.32

.0.12 +0.09 0.11 0.04-0.31 "Wet" Areas (TiclaliBeaclh) 21 0,01 -0.12 0.04_+0.04 0,04 0.01 -0.16 1 - Conditions include drainage areas (areas that collect water) and nondrainage areas (open areas such as lawns and fields).

Wet areas are those that are frequently under water (tidal and beach front areas).

Figure 8 - Beverly MA Residential Soil Concentrations

EH&S TSD # 13-004 Revision 00 Page 9 of 38 Table 3.3(a) - Luzerne County, PA - 'Cesiuin-137 in Soil Suimmarv Data aiid Stntistics

_________Units pCi/g Number IMeasu.red Men Geometric J____

Condition !&

of Range (pCi/g)

Mean Range (pCi/g) for

.Dpth (cm) samples (pci/g)

+/-- (1 sigma)

(pci/g)

.95% of Distribiition Drahmage Areas All Samples 33 0.16 -7.5 2*5-,+2*0 1.8 0*33 -1I0 Subsurfade'Samples 22 OA6 -7.5 2.7 + 2,1 2

0.33-1]2 0-5 cm 12

0.16-7.5 3.1 -- 2.6 2

0321 - 19

• 0-10 cm 10 0.8 - 47 2.2+1i.2 1.9 0.7 -5.3 Stubsui'face S

0.32 - 7.2 2.6 + 2.2 1.8 0.3 - 12 5-15 cm 4

0.68 -7.2 3:0__+ 3*3 2.1 0.21 -20 10-:15 cm 3

0.32--2.3 1.6-+/-i.1 1.2 0.13 -1.1 Non-Drainage.A'eas A&ll Samples 21 0.08 - 1.5

,0.62 +/- 0.4 0.47 0.1 - 2.4 SSubs~urfaceSamples

,18 Q.19 - 1.5 0:674- 0.39 0.56 0.16-2 0-5 'cii 10

.0.13 - 1.5 0.73 +/- 1.4 0:56 0.11 -2.8

,0-10 cm 8

0.39 -1.00 0.59 4- 0.48 0155

0.28 - 1.i Susrhe3 0.0S-0.77 0.32+/-0.77 0.18 0.02-2.1

>5 cm 1 - Conditions include Drainage areas (areas that collect rain water) and nondrainage areas (open areas such as lawns and fields). Some areas were also classified as disturbed and undisturbed Figure 9 - Luzerne County PA Residential Soil Concentrations All three locations found Cs-I137 concentrations in drainage areas were two to three times higher than in non-drainage areas. As seen in Figure 10, evaluation of the Luzerne County data relative to whether the soil was disturbed or undisturbed showed that the highest concentrations were found in the upper 5 to 10 cm of undisturbed soil as would be expected.

Since the highest levels are found in the upper 5 cm, mixing of the soil lowers the overall average concentration. Disturbed soils included tilled locations and locations where fill was used.

EH&S TSD # 13-004 Revision 00 Page 10 of 38 Table,3.3(i)- Luzeine county, PA - Cesiuin-137 in Soil summar.y Data and Statistics Disturbed Versus Undisturbed :Soil Units pCi/g Aritlmaetic Measured Mean

,Geometlic Condition &

Num~ber of Range (pCi/g)

Mean Range (pC i!g), for Depth (cin)

Samples (pCi/g)*

+ (1 signa)

(pCi/g) 95%-of Distribution Drainage Areas Surface 0-5 cm Undisturbed 9

0.7 -7.5

+ 2,9

]

3.1 J

0.58 -17 Disturb'ed 3

j0.'16 -0.99 j0.654-0.14 0.5 0.1 -3.6 Surface 0-1I0 cm Unldisturbed

[

6

- 4.7 2,4+/--1.4 ]

21 0.75 -6.1 Disturbed

[

4

- 2.8 j3.9+/-4,0.81 J 1.7

,0259 -4.8 Non-.Drainage A*reas Surface 0-5 cm Undisturbed 4

0.58 -1.4

0..37 0.85 0.39 - 1.8 Disturbed 6

0.13 -1.5 0:2+/-.6[04 0,07 -2.8 Surface 0-10 cmr Unldisturb. d

[

6 0.39 -14~

0.61 4-0.26 0.57 0.26-1.3 Disturbed 2

j0.45 - 057 0.51 +/-0.08 0:51 0,39 -0.7 1 - Conditions include drainage and nondrainage areas and disturbed (normally flower beds or areas where there was evidence of fill material) and undisturbed areas (those with no evidence that the soil was excavated or filled).

Figure 10 - Luzerne County PA Disturbed and Undisturbed Residential Soil Concentrations The analysis indicates that cesium moves slowly in the soil and unless physically disturbed and remains in the surface layer. The data also indicated that Cs-i137 concentrations in drainage areas (e.g., roof driplines and drain spout discharge locations) are significantly higher than concentrations in open areas. More specifically, the study resulted in 5 general conclusions or findings:

The analysis indicates that fallout deposition data do not adequately predict the variability in local background concentrations for Cs-i137 in soil. Surface samples from undisturbed soil produce the greatest variability and can differ by several orders of magnitude. The 1991 surface sample geometric mean concentrations were in the range from 0.3 to 3 pCi/g

[10 to 110 Bq/kg] with the range of the 95th percentile concentrations extending to about 20 pCi/g [700 Bq/kgJ. [3]

• Areas that collect rain water have significantly higher concentrations of Cs-137 in soil than open areas. The geometric mean concentrations in drainage areas are typically 3 times that of non-drainage areas. [3]

• The concentration of Cs-I137 in soil decrease significantly with depth. In general, most of the cesium is contained in the top 15 cm of undisturbed soil. [3]

Surface samples taken from the 0 to 5 cm depth in undisturbed soil had significantly higher concentrations than those taken at the same depth in disturbed soil. However, surface

EH&S TSD # 13-004 Revision 00 Page 11 of 38 samples taken over the 0 to 10 cm or 0 to 15 cm range were less sensitive to soil disturbance. [3]

• The lognormal distribution is generally more representative of environmental concentrations of Cs-I137 than the normal distribution. [3]

The study concluded that in general, fallout deposition data can be used to predict total surface inventory in a large area but it does not provide a good measure of central tendency and variability for background Cs-i137 concentrations for remedial action or decontamination planning activities in residential, commercial or industrial areas. A reasonable estimate of such background variability can only be obtained by direct sampling and measurement of local data from a nearby area (with like soil and drainage conditions) that has not been affected by the operating facility. [3]

The study reinforces that in addition to local variations due to atmospheric dispersion and washout, factors such as the land-use characteristics, soil bulk density, amount of organic material and drainage affect the Cs-I137 levels from fallout in the soil. Transport of the cesium in the soil, once it is deposited, is affected by many site specific factors including soil type, rainfall, drainage, terrain, vegetation and local activities and conditions. Furthermore, local meteorological conditions can have significant impact on the fallout deposition and transport in a given area. Finally, sampling protocol significantly effects the reported soil concentrations.

[3] Once in contact with the soil, Cs-I137 is tightly bound by the clay-size soil fraction and organic matter, and its further movement by natural chemical processes in the environment is limited. [6] Soils that have been disturbed since the peak depositions in the 1960s, such as those from agricultural tilling, construction work or made ground (e.g., fill) would have lower overall fallout concentrations than natural undisturbed locations due to the variation in concentrations with soil depth. Undisturbed soils in forested areas tend to have higher Cs-I137 concentration in the upper 5 to 10 cm due to root uptake and leaf litter deposition which continuously re-deposits Cs-i137 on the surface of the forest floor. "Drainage' areas or areas where water tends to accumulate and evaporate are locations that concentrate Cs-I137 in soil.

These factors apply to more natural forested and agricultural areas as well as residential areas. A study of Cs-137 fallout redistribution in soils was conducted in 1974 and 1975 for the Brunner Creek watershed of White Clay Lake in Shawano County Wisconsin. [6] As noted in Figure 11, White Clay Lake is located northwest of Green Bay Wisconsin approximately 190 miles from Zion at Latitude 44-48'05" N and Longitude: 088-24'15" W. It is in the same zone of higher fallout deposition between 40 and 50 degrees North as Zion Station.

EH&S TSD # 13-004 Revision 00 Page 12 of 38 Figure 11 -White Clay Lake Shawano County, WI Location The study [6] measured fallout Cs-I137 levels (nCi/m 2) for undisturbed woodland, pasture and marsh soils as well disturbed corn and alfalfa field soils. Major soil types in the watershed area were Onaway loam, Salona loam, and Shiocton silt loam. Land use types sampled were from a 40- to 50- year old upland oak-maple forest that showed no evidence of soil erosion, from corn and alfalfa fields, from pastures, and from a low marshy area where Brunner Creek enters White Clay Lake. Samples of the sediment in the delta area where Brunner Creek enters White Clay Lake were also collected. [6] The data from the reported results are provided in Figure 12.

EH&S TSD # 13-004 Revision 00 Page 13 of 38 0-. 5 53.7

• 2.0O 54.9 *: 3.S 19.3

• 0.8 18.7

• 0.8 38.6

• 4.0 51.8

• 11.5 5-10 41.6

• 2.8 40.0 *: 0.8 19.8

• 0,8 20.2 *k 0.8 4,5.0 *k 4.7 17.3 -, 5.0 10.-IS 18.1 *2.7 14.3 *- 0.1 19.5 *k 0.6 19.3

• 0.8 33.2

• 5.8 3.0

• 1.3 15.20 6.6

• 0.9 3.6 *: 1.6 19.4

• 0.5 18.1

• 0.9 28.7

• 7.0 3.0

• 1.3 20-25 3.1

• 1.1 2.5 *k 0.4 17.5

• 0.9 14.7

• 1.4 29.2 d* 8.2 0.8

• 0.5 25-30 ND ND 9.6 *k1.4 9.8 d1.5 9.1 **2.8 0.3**0.5 30-35 NI)

ND 7.6**1.6 9.0 *1.2 ND ND 35-40 NiD ND 3.2**0.8 3.4*i0.7 ND ND 40-45 ND ND 1.6*:*0.8 0.9*4-0.2 hNd ND Total**

123.6

• 5.1 115.2 t 0.3 110.0 ** 4.1 107.8

• 5.1 184.0

• 17.6 69.9

• 16.7 Range*

102-141 114-116 80-128 68.-141 89-256 31-176 N*6 2

23 23 7

• NI) No smplesclletd

• • Totel and Ranse axe based on the summarization totals for each sample site.

'* Number of samples per det and numbe of sample sites per vegetation type.

Figure 12 - Average concentrations and standard error of the mean of Cs-I137 (nCi/m') in soil profiles under different conditions.

The data indicates that Cs-i137 is retained in the upper 15 cm of undisturbed soils and that collection by marsh and lake sediments of eroded soils can lead to high concentrations similar to the upper layers of undisturbed soils. Although the data set is limited, it can be corrected to pCi/g based upon 1000 pCi/nCi and an average soil bulk density of 1.63 g/cm3 which equates to 8000 grams of material for every 5 cm of depth over a 1 m2 area. Assuming sample dates of January 1, 1975 for the samples collected in 1974 and 1975 this a 38.4 year decay time to June 1, 2013 which is just over the 30 year half-life of Cs-i137. The decay corrected values in pCi/g at an average bulk density of 1.63 g/cm3 are provided in Table 1.

EH&S TSD # 13-004 Revision 00 Page 14 of 38 Table I -Brunner Creek Drainaae Basin Decay Corrected Cs-I137 Concentrations F

F T

T Oak-Maple Pasture Corn Alfalfa Marsh Sediment a

4.

1 1

4 4.

Depth cm 0-5 5-10 10-15 15-20 20-25 25-30 30- 35 35-40 40-45 Activity Error pCi/g pCi/g 2.8E-01

+

1.0E-02 2.1E-01

-+ 1.4E-02 9.3E-02

+

1.4E-02 3.4E-02

+/-

4.6E-03 1.6E-02

+/-

5.7E-03 No Sample No Sample No Sample No Sample Activity Error pCi/g pCi/g 2.8E-01

+/-+

1.8E-02 2.1E-01

+/-+

4.1E-03 7.4E-02

_+/- 5.1E-04 1.9E-02

+

8.2E-03 1.3E-02

+/-

2.1E-03 No Sample No Sample No Sample No Sample Activity pCi/g 9.9E-02 1.0E-01 1.0E-01 1.0E-01 9.0E-02 4.9E-02 3.9E-02 1.6E-02 8.2E-03

+

-+

+_

+

+

Error pCi/g 4.1E-03 4.1E-03 3.1E-03 2.6E-03 4.6E-03 7.2E-03 8.2E-03

4. 1E-03 4.1E-03 Activity pCi/g 9.6E-02 1.0E-01 1.0E-01 9.3E-02 7.6E-02 5.0E-02 4.6E-02 1.7E-02 4.6E-03

+r

+

+

+r

+r

+r Error pCi/g

4. 1E-03 4.1E-03 4.1E-03 4.6E-03 7.2E-03 7.7E-03 6.2E-03 3.6E-03 1.0E-03 Activity Error pCi/g pCi/g 2.0E-01

+/-

2.1E-02 2.3E-01

+/-_

2.4E-02 1.7E-01

+/-

3.0E-02 1.5E-01

+/-

3.6E-02 1.5E-01

+/-+ 4.2E-02 4.7E-02

+/-

1.4E-02 No Sample No Sample No Sample Activity Error pCi/g pCi/g 2.7E-01

+/-

5.9E-02 8.9E-02

+/-+ 2.6E-02 1.SE-02

+/-+ 6.7E-03 1.5E-02

+/-+ 6.7E-03 4.1E-03

+/-

2.6E-03 4.1E-03

+/-

2.6E-03 No Sample No Sample No Sample Total.-

0.636

+/-

0.026 0.592

+/-

0.003 0.566

+_ 0.021 0.554

+/-

0.026 0.946

+/-

0.091 0.359

+/-

0.086 0-15 cm Average 0.194

+/-

0.013 0.187

+/-

0.008 0.100

+/-

0.004 0.101

+/-

0.004 0.200

+

0.025 0.124

+/-

0.031 30 -45 cm Average No Sample No Sample 0.021

+/-_ 0.005 0.023

+

0.004 No Sample No Sample Range 0.525 0.725 0.586 0.597 0.453 0.658 0.350 0.725 0.458 1.316 0.159 0.905 Number of Samples 6

2 23 23 7

9

EH&S TSD # 13-004 Revision 00 Page 15 of 38 The concentration of Cs-I137 was highest in the marsh community where concentrations up to 256 nCi/m 2 (e.g., 1.32 pCi/g decay corrected) where some evaporative concentration would be expected. This is also a deposition area for soil particles eroded from the upland.

Concentrations of Cs-I137 were lowest in the alfalfa and corn fields where erosion had occurred, removing some soil and its associated Cs-I137. (6] Tilling of the soil which mixes soils homogeneously over a 30 cm to 40 cm depth also would have contributed to lower overall concentrations although this was not noted in the study. Fill material from local gravel/sand pits or construction activities that mix soils over a deeper horizon than 15 cm would result even lower overall concentrations.

5.2 Background Cs-I137 Levels in Zion Soils Two studies on soil type and background fallout levels have been conducted in the immediate vicinity of Zion Station. These studies have focused on areas in the eastern portions of the property near Lake Michigan. These areas have consisted of Hosah Park non-impacted areas

[7] and areas located north and northwest of the facility. [8] It was determined that the best location for measuring background would be outside the restricted area boundary toward the north as based in part on Reference 6.1 of one of the studies [8], Annual Report on the Meteorological Monitoring Program at Zion Nuclear Power Station for 2010, Murray and Trettel, Inc. 2/21/2011. The reference demonstrates that winds are predominately from the west and northwest. As a result, locations north and northwest of the restricted area are less likely to be impacted by airborne particulate and gaseous effluents from past plant operations.

An initial determination of background Cs-I 37 levels was conducted to determine the radionuclide activity concentration of key radionuclides in non-impacted soils adjacent to the Zion Nuclear Station. [7] The area chosen for the survey was the Zion City Park District's Hosah Park, located north east of the Zion Nuclear Station, at the end of Shiloh Blvd. [7], as seen in Attachment A. The park consists of open land areas with a small shelter and several asphalt walking trails. There is evidence of several old foundations present indicating some potential soil disturbance since the.1960's. The land area is covered with native grasses and low lying brush. For the most part the open land area appeared not to have been disturbed for a number of years. Prior to the survey, thirty (30) soil sampling locations were identified in Hosah Park. The sampling locations were chosen in areas that appeared to be undisturbed with minimal vegetation as shown in Figure 13.

EH&S TSD # 13-004 Revision 00 Page 16 of 38 mum tiNS tiNS titUS tiNtS U

I I

I t

Ii

!I I

I Figure 13 - Hosah Park Background Soil Evaluation Location [7]

The sampling protocols, analyses and results are described in the technical report "Determination of Radionuclide Activity Concentrations In Soils In Non-Impacted Soils Adjacent to the Zion Nuclear Station, July 2012." [7] At each sampling location a surface (0 -15 cm) and a subsurface (30 - 60 cm) soil sample was collected. As they were collected each soil sample was screened in the field to remove debris, vegetation, and rocks greater than 1 cm in diameter. A total of 64 samples were submitted to an offsite laboratory for analysis. Each soil sample was analyzed for gamma emitting nuclides by gamma spectroscopy. These included (Co-60 and Cs-i137), Sr-90, thorium isotopic (Th-228, Th-230, and Th-232), and uranium isotopic (U-234, U-23S, and U-238). The sample analysis results for select radionuclides are provided in Attachment 3 for the surface soil samples and in for the subsurface soil samples of the report [71. The Cs-I137 results for the surface (SSS) and subsurface (SSB) Hosah Park samples are provided in Table 2 below.

EH&S TSD # 13-004 Revision 00 Page 17 of 38 L4BKG01BJGSSSA01

-2.61E-03 NO 555 L4BKG01BJGSBSA01 1.98E-02 NO SSB L4BKG01C.JGSSSA01 2.49E-02 NO 555 L4BKG01QJGSBSA01 2.19E-02 NO SSB L4BKG01BJGSSSA02 1.37E-01 YES 555 L4BKG01BJGSBSA02 1.59E-02 NO SSB L4BKG01BJGSSSA03 8.32E-02 YES SSS L4BKG01BJGSBSA03

-1.20E-02 NO SSB L4BKG01BJGSSSA04 1.23E-01 YES 555 L4BKG01BJGSBSA04 1.94E-02 NO SSB L4BKG01BJGSSSA05 1.72E-01 YES 555 L4BKG01BJGSBSA05

-6.27E-03 NO SSB L4BKG01BJGSSSA06 4.97E-01 YES SSS L4BKG01BJGSBSA06 4.61E-03 NO SSB L4BKG01BJGSSSA07 3.34E-01 YES 555 L4BKG01BJGSBSA07 5.09E-03 NO SSB L4BKG01BJGSSSA08 1.22E-02 NO 555 L4BKG01BJGSBSA08

-6.13E-03 NO SSB L4BKG01BJGSSSA09 2.66E-01 YES 555 L4BKG01BJGSBSA09

-3.70E-03 NO SSB L4BKG01BJGSSSA10 1.94E-01 YES SSS L4BKGO1BJG5BSA10

-2.22E-02 NO SSB L4BKG01BJGSSSA11 1.51E-01 YES 555 L4BKGO1BJGSBSA11 1.10E-02 NO SSB L4BKGO1BJGSSSA12 3.12E-01 YES SSS L4BKG01BJGSBSA12 1.32E-02 NO SSB L4BKG01BJGSSSA13 3.17E-01 YES 555 L4BKG01BJGSBSA13 1.13E-02 NO SSB L4BKG01BJGSSSA14 1.05E-02 NO 555 L4BKG01BJGSBSA14 9.30E-03 NO SSB L4BKG01BJGSSSA15 2.80E-01 YES 555 L4BKG01BJGSBSA15

-2.27E-03 NO SSB L4BKG01BJGSSSA16 2.18E-01 YES 555 L4BKG01BJGSBSA16 1.05E-01 YES SSB L4BKG01QJGSSSA16 7.57E-03 NO 555 L4BKG01CUJGSBSA16

-6.13E-03 NO SSB L4BKG01QJGSSSA17 2.52E-01 YES 555 L4BKG01BJGSBSA17 4.03E-02 YES SSB L4BKG01CUiGSSSA18 8.86E-02 NO 555 L4BKGO1BJGSBSA18

-6.63E-03 NO SSB L4BKG01QJGSSSA19 8.06E-02 YES 555 L4BKGOIBJGSBSA19 5.66E-03 NO SSB L4BKG01QJGSSSA20 4.02E-01 YES 555 L4BKGO1BJG5BSA20

-4.67E-03 NO SSB L4BKG01O.JGSSSA21 6.51E-01 YES 555 L4BKG01BJGSBSA21 1.26E-03 NO SSB L4BKG01BJGSSSA22 2.53E-01 YES 555 L4BKG01BJGSBSA22 4.81E-03 NO SSB L4BKG01BJGSSSA23 2.25E-01 YES 555 L4BKG01BJGSBSA23 2.14E-01 YES SSB L4BKG01BJGSSSA24

-7.93E-03 NO 555 L4BKG01BJGSBSA24 1.62E-02 NO SSB L4BKG01BJGSSSA25 2.89E-01 YES 555 L4BKG01BJGSBSA2S 1.17E-03 NO SSB L4BKG01BJGSSSA26 2.01E-01 YES 555 L4BKG01BJGSBSA26

-1.54E-02 NO SSB L4BKGO1BJGSSSA27 2.27E-01 YES 555 L4BKG01BJGSBSA27 1.07E-01 YES SSB L4BKG01BJGSSSA28 2.41E-01 YES 555 L4BKG01BJGSBSA28 2.41E-01 YES SSB L4BKG01BJGSSSA29 2.77E-01 YES 555 L4BKG01BJGSBSA29 4.50E-02 NO SSB L4BKGO1BJGSSSA30 2.60E-01 YES 555 L4BKG01BJGSBSA30 1.61E-02 NO SSB When the Hosah Park data is sorted by the Cs-I137 activity in pCi/g and assigned a rank order, the resulting plot shows several background distributions as seen in Figure 14. A frequency plot of the data, provided as Figure 15, also shows several background distributions.

EH&S TSD # 13-004 Revision 00 Page 18 of 38 Rank Order Plot All Hosah Park Cs-137 Result pCi/g 7.00E-01 6.00E-01 5.00E-01

,.4.AIHaC-37Rut i!

4.00E-01 3.00E-01 2,00E-OI1 1.OOE-O1 O.OOE+00*

10 20 30 40 50 60 70

-1.00E-O1 Figure 14 - Rank Order Plot of All Hosah Park Cs-137 Soil Sample Results in pCilg Frequency Plot All Hosah Park Cs-137 Results pCi/g 35 30

• --Frequency 15 101

-0.10 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 pCi/g Figure 15 - Frequency Plot of All Hosah Park Cs-137 Soil Sample Results The Hosah Park concentrations align well with the decay corrected Brunner Creek concentrations for undisturbed forest and pasture soils and disturbed corn and alfalfa field data in Table 1. As expected the range and distribution of the subsurface 30 - 45 cm Cs-I137 concentrations (Figure 17) is lower than the 0-15 cm surface samples (Figure 16).

EH&S TSD # 13-004 Revision 00 Page 19 of 38 Frequency Plot Hosah Park Surface Soil Samples Cs-137 pCi/g 8-Undisturbed

-4Frequency 6

Disturbed 4

Bulk Density Or anic 4 /

/

\\

Content and Drainage 1

0 I

I I

-0.10 0.00 0.10 0.20 0.30 0.40 0.50 0.60 pCi/g Figure 16 - Frequency Plot of Hosah Park Cs-I137 Surface Soil Sample Results Frequency Plot Subsurface Hosah Park Cs-137 Results pCi/g 16 14

-* -Frequency 12 10 8

4

-0. 5 0.00 0.05 0.10 0.15 0.20 0.25 0.30

-2 pCl/g Figure 17 - Frequency Plot of Hosah Park Cs-I137 Subsurface Soil Sample Results The surface sample results are indicative of a lower disturbed soil concentration mingled with a higher undisturbed concentration that ranges out to just over twice the Undisturbed mean concentration of 0.3 pCi/g, This is consistent with the ranges relative to the mean reported for

EH&S TSD # 13-004 Revision 00 Page 20 of 38 the residential soils [3]and agrarian soils at Brunner Creek [6]. The overall surface sample data had a mean Cs-I137 concentration of 0.211 pCi/g and a standard deviation of 0.148 reflecting the overall mean and standard deviation for disturbed and undisturbed soils. When only positively identified results that were above the two sigma error and minimum detectable activity (MDA) were included in the sample set the mean concentration was 0.26 pCi/g, a standard deviation of 0.13 pCi/g and an upper confidence level of 0.31 pCi/g were calculated for the positive results. The report concluded that individual activity concentrations as high as 0.74 pCi/g (e.g., 6.51 E-1 pCi/g maximum + 2 o error 8.77-E-2 pCi/g) for Cs-1 37 in undisturbed surface soil would not be unexpected. This is in the range of the Brunner Creek forest and pasture maximum undisturbed surface soil sample data in Table 1 but is lower than the maximum concentration observed in the marsh samples (up to 1.3 pCi/g) and sediment sample (up to 0.9 pCilg). It is also lower than the undisturbed soil data 95% confidence level for Luzerne County PA in Figure 10 of 1.3 pCi/g for 0 - 10 cm of undisturbed non-drainage area samples. Although the Hosah Park data set fits well within the expected soil concentration from fallout Cs-137 from the residential soils [3]and the Brunner Creek [6] data, undisturbed forested soils could be expected to have 0 - 15 cm average concentration of I to 2 pCi/g and drainage areas could have concentrations of 3 to 6 pCi/g as seen in Figure 10.

The Zion Background reference area study [8] consisted of a description of the survey activities performed and their results in order to assess the levels of natural radioactivity within the environment and building materials at the Zion Nuclear Power Station. The materials of concern were asphalt, concrete and soil. The focus included the unconditional release and potential re-use of concrete and soils originating at the Zion Nuclear Power Station as backfill materials. The soil Cs-I137 sample data from the study was examined for this TSD. The study focused on areas north and northwest of the Zion Unit 1 and 2 plant area as shown in Figure

18. The Cs-137 sample surface (SSS) and subsurface (SSB) results are summarized in Table 3.

Table 3 - Energy Solutions Background Reference Stud, Soil samp*le Results Cs-I137 Result Sample Positive Study Sample pCilg Type ID ES Ref Z-BKG-SOIL-DP-01 1.54E-02 SSB NO ES Ref Z-BKG-SOIL-DP-02

-1.23E-02 SSB NO ES Ref Z-BKG-SOIL-DP-03

-6.58E-03 SSB NO ES Ref Z-BKG-SOIL-DP-04 9.48E-03 SSB NO ES Ref Z-BKG-SOIL-DP-05

-3.47E-02 SSB NO ES Ref Z-BKG-SOIL-DP-06 4.71E-03 SSB NO ES Ref Z-BKG-SOIL-DP-07

-2.80E-03 SSB NO ES Ref Z-BKG-SOIL-DP-08 1.46E-02 SSB NO ES Ref Z-BKG-SOIL-DP-09

-1.48E-02 SSB NO ES Ref Z-BKG-SOIL-DP-1O

-1.83E-02 SSB NO ES Ref Z-BKG-SOIL-DP-11

-4.04E-03 SSB NO ES Ref Z-BKG-SOIL-DP-12

-8.59E-03 S5B NO ES Ref Z-BKG-SOIL-DP-13 1.10E-02 SSB NO ES Ref Z-BKG-SOIL-DP-14 3.91E-02 SSB NO ES Ref Z-BKG-SOIL-DP-15

-2.14E-02 SSB NO ES Ref Z-BKG-SOIL-SF-01 1.05E-02 SSS NO

EH&S TSD # 13-004 Revision 00 Page 21 of 38 Cs-I137 Result Sample Positive Study Sample pCilg Type ID ES Ref Z-BKG-SOIL-SF-02

-8.53E-03 SSS NO ES Ref Z-BKG-SOIL-SF-03

-2.82E-02 SSS NO ES Ref Z-BKG-SOIL-SF-04

-1.27E-02 SSS NO ES Ref Z-BKG-SOIL-SF-05 6.60E-02 SSS YES ES Ref Z-BKG-SOII.-SF-06 1.84E-03 SSS NO ES Ref Z-BKG-SOIL-SF-07

-9.25E-03 SSS NO ES Ref Z-BKG-SOIL-SF-08 1.17E-02 SSS NO ES Ref Z-BKG-SOIL-SF-09

-6.62E-03 SSS NO ES Ref Z-BKG-SOIL-SF-1O 2.49E-02 SSS NO ES Ref Z-BKG-SOIL-SF-11 5.31E-03 SSS NO ES Ref Z-BKG-SOIL-SF-12 9.79E-03 SSS NO ES Ref Z-BKG-SOIL-SF-13 2.93E-02 SSS NO ES Ref Z-BKG-SOIL-SF-14 1.13E-02 SSS NO ES Ref Z-BKG-SOIL-SF-15 3.82E-03 SSS NO oil Location Marked in Blue)

EH&S TSD # 13-004 Revision 00 Page 22 of 38 The frequency plot Figure 19 of the Table 3 data for the Energy Solutions reference background study [8] indicates several background Cs-i137 distributions that are an order of magnitude lower than the Hosah Park data in Figure 15, Figure 16, and Figure 17. This indicates that the sample area was highly disturbed soil with much lower overall Cs-I137 concentrations from fallout.

Frequency Plot All ES Reference Study Cs-137 Soil Results Frequency 7.00 6.00[

5.00I 4.00I 3.001 2.00 1*

1.00I 0.00 L

-4.00 -02

-2.O0E-02 0.OOE+00 2.00E-02 4.O0E-02 6.00E-02 8.00E-02

-1.00 Figure 19-Frequency Plot of All Energy Solution Reference Background Study Soil Cs-137 Results It is not surprising that the Energy Solutions Reference Area has lower overall Cs-I137 concentrations than the Hosah Park data given the sampling locations proximity to site structures and roads.

The Hosah Park and Energy Solutions sample data is representative of well drained disturbed and undisturbed soils adjacent to the Lake. As noted in the residential area and Brunner Creek soil study results, these locations are not necessarily indicative of the Cs-i137 levels that would be expected in drainage areas, wetlands, or undisturbed forest areas of the Zion Station property where characterization measurements will be conducted.

Extensive soil sampling has also been conducted to date in ISFSI impacted MARSSIM Class 3 areas and adjacent ISFSI in survey units 10218, 10219, 10220, 10221. Results from these additional study areas and the Hosah Park and Energy Solutions Reference Background Study are provided in Attachment B and comprise a Zion Facility on-site sample set of 635 surface (0-15 cm) and subsurface (30-45 cm) soil sample results.

EH&S TSD # 13-004 Revision 00 Page 23 of 38 irough 3 Survey Units Showing ISFSI Area 10218 and Adjacent Survey Units The overall sample results range from a non-detect of -9.86E-3 pCi/g for sample L3I0218CJGSSB-C003 from Survey Unit 10218 to 1.14 pCi/g for sample L310220CIGSSSC017 of Bull Creek sediment in survey Unit 10220. It should be noted that this is within the range of the Cs-I137 anticipated fallout levels in the 40 to 50 degrees north latitude region based upon the residential soil [3] Figure 10 and decay corrected Brunner Creek [6] data Table 1.

As seen in Figure 21 the 635 sample data set is heavily weighted to results at the lower end of the spectrum which is indicative of non-detected sample results or very low results that correspond to undisturbed subsurface soils or highly disturbed surface and subsurface soils. Of the 635 sample results 177 had detectable Cs-I137 concentrations that exceeded both the MDA and 2 sigma error associated with the measurement. The frequency plot of the positive identification results is provided as Figure 22.

EH&S TSD # 13-004 Revision 00 Page 24 of 38 Frequency Plot of All Soil Sample Cs-137 Results pCi/g 500 200

• Unisturbed--4-Freqbe nl-y Un¢ DisturbedSufe n Subsurfc H*~

• w Disturbed Surface an Fiur2

- FeUencyiPlture oufa AlU65Solaplis-I37re suDltsal 50 Freqenc AlF Postiv IDSoi 40 Some Undisturbed 35 buru&

30

'Disturbe Surface and 30 Subsurface 25 20 h% ~Undisturbed Surf-_ce 15 Non*-Draina 10

• .Undisturbed Draina e s

• and Marsh 0.0+00 2.00E-01 4.O0E-01 6.00E-01 8.00E-01 1.00E+00 1.20E+00 1.40E+00

-5 Figure 22 - Frequency Plot of 177 Soils Samples with Positive Identification of Cs-I137 Most undisturbed subsurface soil has undetectable levels of Cs-i137 at the 30 to 45 cm depth.

As seen in Figure 22 the bulk of the soil sample results to date are indicative of disturbed soils

EH&S TSD # 13-004 Revision 00 Page 25 of 38 since most areas sampled are in the vicinity of the facility rather than at remote locations on the property. Some data indicates that the results are from undisturbed soils in the 0.2 to I pCi/g range indicative of non-drainage soils similar to the Hosah Park data shown in Figure 16. As seen in Figure 23 the bias created by a preponderance of data lacking positive Cs-i137 identification and with disturbed soil results artificially weights the data set to levels that are well below the 95% confidence levels reported in residential soils (Figure 7, Figure 8, Figure 9, Figure 10) and the range of Cs-I137 concentrations observed in surface samples in the environment such as those from Brunner Creek Table 1.

All Cs-I157 Data, F~Ip~cal Fit

-I-I 0.36 0.32-0.26 0.24 -

0.20 -

0.12 0.06-

.0.1 0.0 95%

(x = 0.27) 99o%

(X = 0.5) 0,4 0.5 0.6 1.1 1.2 0.1 0.2 0.3 0.7 0.6 0.9 1.0 Figure 23 - Empirical Fit of All Soil Sample Data Surface and Subsurface Using Model Risk Software Given the lack of Zion Solutions sample results from undisturbed drainage and non-drainage areas and that all sample data to date aligns well with observed fallout Cs-i137 background concentrations, the decay corrected 0-10 cm 95% confidence values for the Luzerne County, PA - Cesium-I137 in Soil Summary Data and Statistics Disturbed and Undisturbed Soils in Figure 10 can be used to identify Cs-i 37 concentrations that are outside the range of fallout background. As noted in the text below Figure 5, the residential soil study data [3] was decay corrected to 1991. The Figure 10 values were decay corrected for 22.4 years of decay from January 1, 1991 to June 1, 2013. The upper bound of the decay corrected 95% confidence Cs-i 37 concentrations are shown in the last column of Table 5 - Decay Corrected Luzerne County PA Summary Data for Disturbed and Undisturbed Soils at 0 - 10 cm.

EH&S TSD # 13-004 Revision 00 Page 26 of 38 Table 4 - Original Luzerne County PA Summary Data for Disturbed and Undisturbed Soils at 0 -

10 cm Table 5 - Decay Corrected Luzerne County PA Summary Data for Disturbed and Undisturbed Soils at0 -l10cm Decay Corrected Data Condition Number T

Arithmetic Geometric Range (pCiig)

& Depth of Measured Mean (pCi/g) +/-

Mean for 95% of (cm)

Samples Range pCi/g j (1 sigma) j (pCi/g)

Distribution

__________Drainage Areas Surface 0-10 cm Undisturbed 6

0

-2.80 1.43

+

0.83 1.25 0.45 3.63 Disturbed 4

0 1.67 {2.32

+

0.48 j 1.01 0.35

-_ 2.86 Non-Drainage Areas Surface 0-10 cm Undisturbed 6

0.23

-0.66 0.36

+/-

0.15 0.34 0.15 0.77 Disturbed 2

0.27

-0.34 0.30

+/-

0.05 j 0.30 0.23

-0.42 The decay corrected upper 95% value of the distribution in Table 5 can be used to identify Cs-137 concentrations that are outside the range of expected soil concentrations due to world-wide fallout.

6.0 Conclusion The soil sample data indicates that the majority of the Class 3 area soil samples are from disturbed soils. The Hosah Park data [7] and overall sample data fit well with fallout levels predicted using the decay corrected Brunner Creek [6] study data and the decay corrected residential soils study of background levels in New York, Massachusetts, and Pennsylvania

[3]. Given this the Table 5 - Decay Corrected Luzerne County PA Summary Data for Disturbed and Undisturbed Soils at 0 - 10 cm upper 95 th percentile levels for drainage and non-drainage, disturbed and undisturbed soil Cs-i137 levels should be used as investigation levels for non-impacted, and Class 2 and 3 land area survey units. The investigation levels should be specified in the Survey Plan, Survey Package or Work Plan.

7.0 Attachments

EH&S TSD # 13-004 Revision 00 Page 27 of 38 7.1 Attachment A - Zion Site Layout with Future ISFSI Location 7.2 Attachment B - All Soil Sample Results Background Studies and Class 3 Southwest Survey Units 8.0 References

[1]

"DTBD-06-003, Revision No. 0, Use of In Situ Gamma Spectroscopy for Final Site Survey, Rancho Seco Nuclear Generating Station Decommissioning Technical Basis Document, May 26, 2006".

[2]

"Historical Overview of Atmospheric Nuclear Weapons Testing and Estimates of Fallout In the Continental United States, Harold L. Beck and Burton G. Bennett, Health Physics, Vol. 82, No. 5, May 2002.".

[3]

"Investigations of Natural Variations of C3esium137 Concentrations In Residential Soils, Prepared for the Health Physics Society 39th Annual Meeting Student III -

Environmental and Radon Session June 28, 1994".

[4]

"Tracking the Fukushima Radionuclides, Naohiro Yoshida and Jota Kanda, Science 336, 1115 (2012); June 1, 2012".

[5]

"UNSC3EAR 2000 Report Vol. I, Sources and Effects of Ionizing Radiation, Annex C3, Exposures to the public from man-made sources of radiation, 2000.".

[6]

"Redistribution of Fallout 137C3s In Brunner Creek Watershed In Wisconsin, Jerry C3.

Ritchie, J. Roger McHenry, and Gary D. Bubenzer USDA-ARS, Beltsville, MD, and Durant, OK and the University of Wisconsin-Madison, WI, 1982".

[7]

"Determination of Radionuclide Activity Concentrations In Soils In Non-Impacted Soils Adjacent to the Zion Nuclear Station, July 26, 2012".

[8]

"CS-RS-PN-028, Revision 0, Background Reference Area Report Zion Nuclear Power Station Zion, I, February 7, 2012".

Attachment A Zion Site Layout with Future ISFSI Location EH&S TSD # 13-004 Revision 00 Page 28 of 38

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 29 of 38 Cs-137 Result pCi/g Cs-137 Result pOi/g Mosan L'4bKbUlbJbbbRU1

-i.blL-UJ*

S5S PlU Hosan L4IBKLUIBJ(,St5AUb 4.blE-03*

55B NO Hosah L4BKG01QJGSSSA01 2.49E-02 SSS NO Hosah L4BKG01BJGSBSA07 5.09E-03 SSB NO Hosah L4BKG01BJGSSSA02 1.37E-01 SSS YES Hosah L4BKG01BJGSBSA08

-6.13E-03 SSB NO Hosah L4BKG01BJGSSSA03 8.32E-02 SSS YES Hosah L4BKG01BJGSBSA09

-3.70E-03 556 NO Hosah L4BKG01BJGSSSA04 1.23E-01 SSS YES Hosah L4BKGOIBJG5BSA10

-2.22E-02 SSB NO Hosah L4BKGO1BJGSSSA05 1.72E-01 SSS YES Hosah L4BKG01BJGSBSA11 1.10E-02 SSB NO Hosah L4BKG01BJGSSSA06 4.97E-01 SSS YES Hosah L4BKG01BJGSBSA12 1.32E-02 SSB NO Hosah L4BKG01BJGSSSA07 3.34E-01 5S5 YES Hosah L4BKG01BJGSBSA13 1.13E-02 SSB NO Hosah L4BKG01BJGSSSA08 1.22E-02 SSS NO Hosah L4BKG01BJGSBSA14 9.30E-03 SSB NO Hosah L4BKGO1BJGSSSA09 2.66E-01 SSS YES Hosah L4BKGOIBJGSBSA15

-2,27E-03 SSB NO Hosah L4BKG01BJGSSSA10 1.94E-01 SSS YES Hosah L4BKG01BJGSBSA16 1.05E-01 SSB YES Hosah L4BKG01BJGSSSA11 1.51E-01 555 YES Hosah L4BKGO1CJGSBSA16

-6.13E-03 SSB NO Hosah L4BKG01BJGSSSA12 3.12E-01 555 YES Hosah L4BKG01BJGSBSA17 4.03E-02 SSB YES Hosah L4BKG01BJGSSSA13 3.17E-01 555 YES Hosah L4BKG01BJGSBSA18

-6.63E-03 SSB NO Hosah L4BKG01BJGSSSA14 1.05E-02 SSS NO Hosah L4BKGOIBJGSBSA19 5.66E-03 SSB NO Hosah L4BKG01BJGSSSA15 2.80E-01 555 YES Hosah L4BKG01BJG5BSA20

-4.67E-03 556 NO Hosah L4BKG01BJGSSSA16 2.18E-01 SSS YES Hosah L4BKG01BJGSBSA21 1.26E-03 SSB NO Hosah L4BKG01CUJGSSSA16 7.57E-03 555 NO Hosah L4BKGOiBJGSBSA22 4.81E-03 55B NO Hosah L4BKG01QJGSSSA17 2.52E-01 555 YES Hosah L4BKGOiBJGSBSA23 2.14E-01 556 YES Hosah L4BKG01OJGSSSA18 8,86E-02 555 NO Hosah L4BKGOiBJGSBSA24 1.62E-02 SSB NO Hosah L4BKG01WJGSSSA19 8.06E-02 555 YES Hosah L4BKGOiBJGSBSA2S 1,17E-03 SSB NO Hosah L4BKGO1WJGSSSA20 4.02E-01 555 YES Hosah L4BKGOiBJGSBSA26

-1.54E-02 SSB NO Hosah L4BKG01QJGSSSA21 6.51E-01 S55 YES Hosah L4BKGOiBJGSBSA27 1.07E-01 SSB YES Hosah L4BKG01BJGSSSA22 2.53E-01 555 YES Hosah L4BKG01BJGSBSA28 2.41E-01 SSB YES Hosah L4BKG01BJGSSSA23 2.25E-01 555 YES Hosah L4BKG01BJGSBSA29 4.50E-02 556 NO Hosah L4BKG01BJGSSSA24

-7.93E-03 SSS NO Hosah L4BKGOiBJGSBSA30 1.61E-02 556 NO Hasah L4BKG01BJGSSSA25 2.89E-01 SSS YES Hasah L4BKG01BJGSBSA02 1.59E-02 SSB NO Hosah L4BKG01BJGSSSA26 2.01E-01 SSS YES Hosah L4BKG01BJGSBSA03

-1.20E-02 556 NO Hosah L4BKG01BJGSSSA27 2.27E-01 SSS YES Hosah L4BKG01BJGSBSA04 1.94E-O2 SSB NO Hosah L4BKG01BIGSSSA28 2.41E-01 SSS YES Hosah L4BKG01BJGSBSA05

-6.27E-03 SSB NO Hosah L4BKG01BJGSSSA29 2.77E-01 SSS YES ES Ref Z-BKG-SOIL-DP-01 1.54E-02 55B NO Hosah L4BKG01BJGSSSA30 2,60E-01 SSS YES ES Ref Z-BKG-SOIL-DP-02

-1.23E-02 556 NO Hosah L4BKG01BJGSBSA01 1.98E-02 SSB NO ES Ref Z-BKG-SOIL-DP-03

-6.58E-03 556 NO Hosah L4BKG01OJGSBSA01 2.19E-02 SSB NO ES Ref Z-BKG-SOIL-DP-04 9.48E-03 SSB NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 30 of 38 Cs-237 Result pCi/g

-3.47E-02 Cs-137 Result pCi/g 2.97E-02 t

eT

/IIt-*

I-VU NO 1*1"31 VLL-3Y T}IM--Ui.L-I.

I I

4

+

4-ES Ref IZ-BKG-SOIL-DP-06 4.71E-03 I SSB NO ISFSI IVCC-SYST-A019-SS 3.17E-03 NO ES Ref Z-BKG-SOIL-DP-07

-2.80E-03 SSB NO ISFSI VCC-SYST-A020-SS 3.24E-03 SSB NO ES Ref Z-BKG-SOIL-DP-08 1.46E-02 SSB NO ISFS1 VCC-SYST-A021-SS 1.13E-02 SSB NO ES Ref Z-BKG-SOIL-DP-09

-1.48E-02 SSB NO ISFS1 VCC-SYST-A022-SS 3.22E-02 SSB NO ES Ref Z-BKG-SOIL-DP-10

-1.83E-02 SSB NO ISFS1 VCC-SYST-A023-SS 1.68E-02 SSB NO ES Ref Z-BKG-SOIL-DP-11

-4.04E-03 SSB NO ISFS1 VCC-SYST-A024-SS 2.57E-02 SSB YES ES Ref Z-BKG-SOIL-DP-12

-8.59E-03 SSB NO ISFS1 VCC-SYST-A025-SS 2.36E-03 SSB NO ES Ref Z-BKG-SOIL-DP-14 3.91E-02 SSB NO ISFS1 L310218CSGSSB-A001 3.08E-02 SSB YES ES Ref Z-BKG-SOIL-DP-15

-2.14E-02 SSB NO ISFS1 L310218CSGSSB-A002 4.62E-03 SSB NO ES Ref Z-BKG-SOIL-SF-01 1.05E-02 555 NO ISFS1 L310218CSGSSB-A003

-3.07E-03 SSB NO ES Ref Z-BKG-SOIL-SF-02

-8.53E-03 SSS NO lSFSI L310218CSGSSB-A004 7.96E-02 SSB YES ES Ref Z-BKG-SOIL-SF-03

-2.82E-02 SSS NO ISFS1 L310218CSGSSB-A005 3.23E-02 SSB YES ES Ref Z-BKG-SOIL-SF-04

-1.27E-02 SSS NO ISFS1 L310218CSGSSB-AO06 3.41E-03 SSB NO ES Ref Z-BKG-SOIL-SF-05 6.60E-02 SSS YES ISFS1 L310218CSGSSB-A007 2.75E-04 SSB NO ES Ref Z-BKG-SOIL-SF-06 1.84E-03 SSS NO ISFS1 L310218CSGSSB-A008 1.57E-02 SSB NO ES Ref Z-BKG-SOIL-SF-07

-9.25E-03 SSS NO ISFSI L310218CSGSSB-BO05

-2.25E-03 SSB NO ES Ref Z-BKG-SOIL-SF-08 1.17E-02 SSS NO ISFSI L310218CSGSSB-B006 8.73E-04 SSB NO ES Ref Z-BKG-SOIL-SF-09

-6.62E-03 SSS NO ISFSt L310218CSGSSB-B002 1.62E-03 SSB NO ES Ref Z-BKG-SOIL-SF-10 1.49E-02 55S NO ISFSI L310218CSGSSB-B003 1.82E-02 SSB NO ES Ref Z-BKG-SOIL-SF-11 5.31E-03 SSS NO ISFSI L310218CSGSSB-B007 3.12E-02 SSB YES ES Ref Z-BKG-SOlL-SF-12 9.79E-03 SSS NO ISFSI L310218CSGSSB-B001 6.95E-02 SSB YES ES Ref Z-BKG-SOIL-SF-13 2.93E-02 555 NO ISFSI L310218CSGSSB-B004 7.37E-02 SSB YES ES Ref Z-BKG-SOIL-SF-14 1.13E-02 SSS NO ISFS1 L310218CSGSSB-B025 3.00E-02 SSB YES ES Ref Z-BKG-SOIL-SF-15 3.82E-03 SSS NO ISF51 L310218CSGSSB-B026

-6.86E-03 SSB NO ISFSI L310218CSGSSB-B009 6.54E-02 SSB YES ISFS1 L310218CSGSSB-B027 3.39E-02 SSB YES ISFSI L310218CSGSSB-B010

-6,20E-03 SSB NO ISFS1 L310218CSGSSB-B029

-8.91E-03 SSB NO ISFSI L310218CSGSSB-B011

-1.26E-02 SSB NO ISFSI L310218CSGSSB-B030

-9.28E-03 SSB NO ISFSI L310218CDGSSB-B011 1.33E-02 SSB NO ISF51 L310218CSGSSB-A017 5.64E-02 SSB YES ISFS1 L310218CSGSSB-B012

-8.03E-03 SSB NO ISFSI L310218CSGSSB-A018

-4,20E-03 SSB NO ISFS1 L310218CSGSSB-B013 1.18E-02 SSB NO ISFS1 L310218CSGSSB-A019 2.00E-02 SSB NO ISFSI L310218CSGSSB-B014 6.28E-02 SSB YES ISFS1 L310218CDGSSB-A019 6.95E-03 SSB NO ISFSl 1310218CSGSSB-B015 2.61E-04 SSB NO ISF51 L310218CSGSSB-A020 4,87E-02 SSB YES ISFSI L310218CSGSSB-B016 1.78E-02 SSB NO ISFSI L310218CSGSSB-A021 3.64E-03 SSB NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 31 of 38 SCs-137 Result pCi/g 1.85E-02 3.12E-02 Cs-137 Result pCi/g 5.07E-03 SSB NO ISFSI I

4 Li1U~l+/-bLbbb-MULL 8.69E-03 SB NO ISFSI I L310218CSGSSB-B017 6.30E-03 I SSB NO ISFSI VCC-SYST-A011-SS 1.53E-02 ISSB NO ISFSI 1.310218CSGSSB-B018 2.98E-02 SSB YES ISFS1 VCC-SYST-A009-SS 2.11E-02 SSB NO ISFSI L310218CSGSSB-B019 9.49E-03 SSB NO ISFSI VCC-SYST-A016-SS 2.44E-02 SSB NO ISF51 L310218CSGSSB-B021 3.10E-02 SSB NO ISFSI VCC-SYST-A014-SS 2.70E-02 SSB NO ISF51 L31O218CSGSSB-B022 2.27E-02 SSB NO tSFSl VCC-SYST-A010-SS 5.61E-02 SSB YES ISFSI L310218CSGSSB-B023 7,67E-02 SSB YES ISFSI VCC-SYST-A017-SS

-1.25E-02 SSB NO ISFSl L310218CSGSSB-A025 1,92E-02 SSB NO ISF51 L310218CJGSSB-C004

-9.11E-04 SSB NO ISFSl L310218CSGSSB-A026

-5.51E-03 SSB NO ISFS1 L310218CJGSSB-C005 8.91E-04 SSB NO ISFSl L310218CSGSSB-A010

-3.35E-03 SSB NO ISF51 L310218CJGSSB-C004 2.34E-03 SSB NO ISF51 1.310218CSGSSB-A030 1.45E-03 SSB NO ISF51 VCC-SYST-A008-SS 1.10E-02 SSB NO ISFS1 L310218CSGSSB-A026 4.85E-03 SSB NO ISF51 VCC-SYST-A027-SS 1.72E-02 SSB NO ISFSI L310218CSGSSB-A012 5.43E-03 SSB NO ISFSl VCC-SYST-A026-SS 3.07E-02 SSB YES ISFSI L310218CSGSSB-A028 1.43E-02 SSB NO ISFSI L310218CJGSSB-C006 3.16E-02 SSB YES ISFSI L310218CSGSSB-A011 1.45E-02 SSB NO ISFSI VCC-SYST-A029-SS

-1.56E-02 SSB NO lSFSl L31O218CSGSSB-A027 1.52E-02 SSB NO ISFSI VCC-SPL1-A029-SS 8.50E-04 SSB NO ISFSI L310218CSGSSB-A013 5.42E-02 SSB YES ISFSI VCC-SYST-A030-SS 5.20E-03 SSB NO ISFSI L310218CSGSSB-A009 6.95E-02 SSB YES ISFSI 1310218CDGSSB-B024

-2.51E-02 SSB NO ISFSI L310218CJGSSB-C002

-8.38E-03 SSB NO ISFS1 L310218CSGSSB-B024

-1.40E-02 SSB NO ISFS1 L310218CJGSSB-C001 2.77E-03 SSB NO ISF51 L310218CSGSSB-B008

-5.84E-03 SSB NO ISF51 1.310218CJGSSB-C003 9.86E-03 SSB YES ISFS1 L310218CSGSSB-A029 4.55E-03 SSB NO ISF51 L310218CSGSSB-A014 1.96E-02 SSB NO ISFSI L310218CSGSSB-B020 8.35E-03 SSB NO ISFSI L310218CSGSSB-A015 2.93E-02 SSB YES ISFSI L310218CSGSSB-A023 1.94E-02 SSB NO ISFSI L310218CSGSSB-A016 5.55E-02 SSB YES ISF51 L31021811GSSB-A003 1.99E-02 SSB NO ISFSI VCC-SYST-A007-SS

-7.48E-03 556 NO ISF51 L310218CSGSSB-B028 2.56E-02 SSB NO ISFS1 VCC-SYST-A005-SS

-1.62E-03 556 NO ISFS1 L310218CSGSSS-B009 9.23E-02 SSS YES ISFSI VCC-SYST-A004-SS 4.89E-03 SSB NO ISFS1 L310218CSGSSS-B009 3.38E-02 SSS YES ISFSI VCC-SYST-A001-SS 3.12E-02 SSB YES ISF51 L310218CSGSSS-B010 2.14E-02 SSS NO ISF51 VCC-SYST-A003-SS 3.49E-02 SSB YES ISFS1 L310218CSGSSS-B011 7.77E-02 SSS YES ISFSI VCC-SYST-A006-SS 5.03E-02 SSB YES ISFSI L310218CSGSSS-BO12 3.45E-03 SSS NO ISFSI VCC-SPL1-A002-SS 6.27E-02 SSB YES ISFSI L310218CSGSSS-B013 5.17E-02 SSS YES ISFSI VCC-SYST-A002-SS 8.45E-02 SSB YES ISFSI L310218CSGSSS-B014 8.05E-02 SSS YES ISFSI VCC-SYST-A013-SS 2.60E-03 SSB NO ISF51 L310218CSGSSS-B015

-7.03E-03 SSS NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 32 of 38 Cs-137 Result pui/g 7.00E-02 Cs-137 Result pI/g-l I 1.37E-02 8.06E-03 I*I-*I J L5 J.UZ 3.*b* bbb-I*U JLb ISFSI IVCC-SYST-A018-SF 8.51E-03 SSS NO I SFSI L310218CDGSSS-B030 I11li NO ISFSI VCC-SYST-A018-SF 1.73E-02 SSS NO ISFSI L310218CSGSSS-A017 2.73E-02 SSS YES ISFS1 VCC-SYST-A019-SF 7.32E-03 SSS NO ISFSI L310218CSGSSS-A017 4.57E-02 SSS YES ISFS1 VCC-SYST-A020-SF 2.86E-02 SSS NO ISFSI L31021SCSGSSS-A018 3.04E-02 SSS NO ISFSI VCC-SYST-AO21-SF 1.77E-02 SSS NO tSFSI L310218CSGSSS-A019

-6.53E-04 SSS NO ISFSl VCC-SYST-A022-SF 1.80E-02 SSS NO ISFS1 L310218CSGSSS-A020 1.06E-02 SSS NO ISFSI VCC-SYST-A023-SF

-7.90E-03 SSS NO ISFS1 L310218CSGSSS-A021 7.83E-02 SSS YES ISF51 VCC-SYST-AO24-SF 3.32E-02 SSS YES ISFS1 L310218CSGSSS-A022 2.02E-02 SSS NO ISFS1 VCC-SYST-A025-SF

-2.95E-03 SSS NO ISFSI L310218CDGSSS-A022 1.17E-02 SSS NO ISFS1 L31O218CSGSSS-A001 2.59E-02 SSS YES ISFSI L310218CSGSSS-B017 8.02E-02 SSS YES ISFSI L310218CSGSSS-A001 2.05E-02 SSS NO ISFSI L310218CSGSSS-B017 8.41E-02 SSS YES ISFSI L310218CSGSSS-A002 5.86E-02 SSS YES ISFSI L310218CSGSSS-B018 1.16E-02 SSS NO lSFSl L310218CSGSSS-A003 1.90E-02 SSS NO ISFS1 1310218CSGSSS-B019 5.19E-02 SSS YES ISFSI L310218CDGSSS-A003 4.64E-02 SSS YES ISFS1 L310218CSGSSS-B021 2.34E-02 SSS NO ISFSI L31021SCSGSSS-A004 4.14E-02 555 YES ISFS1 L310218CSGSSS-B022 4.35E-03 SSS NO ISFSI L310218CSGSSS-A005 3.65E-02 SSS NO ISFSI L310218CSGSSS-B023 2.55E-03 SSS NO ISFS1 L310218CSGSSS-A006 3.60E-02 SSS YES ISFSI L310218CSGSSS-A024 5.52E-02 SSS YES ISF51 L310218CSGSSS-A007 8.25E-03 SSS NO ISFSI L310218CSGSSS-A025 2.86E-03 SSS NO ISFSI 1.310218CSGSSS-A008 9.34E-03 SSS NO tSFSI L310218CSGSSS-A026

-7.86E-04 SSS NO ISFS1 L310218CSGSSS-B005 1.74E-02 SSS NO ISFS1 L310218CSGSSS-A028

-8.44E-03 SSS NO ISFSI L310218CSGSSS-B001 3.12E-02 SSS NO ISFS1 L310218CSGSSS-A012

-3.57E-03 SSS NO ISFSI L310218CSGSSS-B001 3.25E-02 SSS YES ISFSI L310218CSGSSS-A011 1.07E-03 SSS NO ISFSI L310218CSGSSS-B006 5.27E-02 SSS YES ISFSI L310218CSGSSS-A010 1.19E-02 SSS NO ISF51 L310218CDGSSS-B002 7.13E-02 SSS YES ISFSI L310218CSGSSS-A009 1.49E-02 SSS NO ISFSI L310218CSGSSS-B007 8.19E-02 SSS YES ISFSI L310218CSGSSS-A030 2.18E-02 SSS YES ISFSI L310218CSGSSS-B002 9.08E-02 SSS YES ISFSI L310218CSGSSS-A027 3.43E-02 SSS YES ISFSI L310218CSGSSS-B004 1.17E-01 SSS YES ISF51 L310218CSGSSS-A013 4.13E-02 SSS YES ISFSI L310218CSGSSS-B003 3.07E-01 SSS YES ISFS1 L310218CJGSSS-C003

-5.62E-03 SSS NO ISFSI L310218CSGSSS-B025

-6.81E-04 SSS NO ISFSI L310218CJGSSS-C001 2.72E-04 SSS NO ISFSI L310218CSGSSS-B025

-3.60E-03 SSS NO ISFSI L310218CJGSSS-C002 2.61E-03 SSS NO ISFSI L310218CSGSSS-B026 1.34E-03 SSS NO ISFS1 L310218CSGSSS-A016 1.97E-02 SSS NO ISFSI L310218CSGSSS-B027

-8.50E-04 SSS NO ISFSI L310218CJGSSS-CO04 2.22E-02 SSS YES ISFSI L310218CSGSSS-B029 2.91E-02 SSS YES ISFS1 L310218CSGSSS-A014 2.64E-02 SSS NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 33 of 38 Cs-137 Result pCi/g 2.88E-02 Cs-137 Result pCi/g 2.97E-02 SsS YES ISFSI L310218CSGSSS-A014 3.16E-02 3.56E-02 SSS NO ISFSI VCC-SYST-A004-SF

-2.80E-02 SSS NO ISFSI L310218CSGSSS-B020 4.10E-02 SSS YES ISFSI VCC-SYST-A006-SF

-2.21E-03 SSS NO ISFSI L310218CSGSSS-B028 4.65E-02 SSS YES ISFSI VCC-SYST-A007-SF 2.20E-04 SSS NO ISFS1 L31021811GSSS-A002 1.09E-01 SSS YES ISFSI VCC-SYST-A002-SF 2.12E-03 SSS NO ISFSI L31021811GSSS-AO01 1.16E-01 SSS YES ISF51 VCC-SYST-A005-SF 3.38E-03 SSS NO SW L310220CJGSSSB001 2.74E-01 SSB YES ISFSI VCC-SYST-A001-SF 9,04E-03 SSS NO SW L310220CJGSSSB002 1.02E-01 SSB YES ISFSI VCC-SYST-A003-SF 1.41E-02 SSS NO SW L310220CJGSSSB003 1.30E-O1 SSB YES ISFSI VCC-SPL1-A002-SF 2.43E-02 SSS NO SW L310220CJGSSSB004 3.18E-02 SSS NO ISFSl VCC-SYST-A001-SF 2.85E-02 S55 YES SW 1310220CJGSSSBO05 6.57E-02 SSB NO ISFSl VCC-SYST-A008-SF 1.28E-01 SSS YES SW L310220CJGSSSB006 6.84E-02 SSB NO ISFSI VCC-SYST-A017-SF

-8.30E-03 SSS NO SW L310220CJGSSSBO07 3.37E-02 SSB NO ISF51 VCC-SYST-A014-SF

-5.49E-03 SSS NO SW L310220CJGSSSBO08 7.69E-02 SSB NO lSFSl VCC-SYST-A012-SF

-3.74E-03 SSS NO SW L310220CO.GSSSB008 6.77E-02 SSB YES ISFSI VCC-SYST-A010-SF 1.35E-03 SSS NO SW L310220CJGSSBB001 5.81E-02 SSB NO lSFSI VCC-SYST-A011-SF 6.64E-03 555 NO SW L310220CJGSSBB002 1.13E-01 SS8 YES lSFSI VCC-SYST-A016-SF 7.89E-03 SSS NO SW L310220CJGSSBB003 4.09E-02 SSS NO ISFSI VCC-SYST-A015-SF 1.10E-02 SSS NO SW L310220CJGSSBB004 1.24E-01 SSS YES ISFS1 VCC-SYST-A009-SF 1.66E-02 SSS NO SW L310220CIGSSBB005

-8.06E-04 SSB NO ISFSI VCC-SYST-A009-SF 2.08E-02 SSS NO SW L310220CJGSSBBO06 9.77E-03 SSS NO ISFSI VCC-SYST-A013-SF 5.91E-02 SSS YES SW L310220CJGSSBB007 4.08E-O2 SSB NO ISFSI VCC-SYST-A027-SF

-6.62E-03 SSS NO SW L310220CJGSSBB008 1.87E-02 SSB NO ISFS1 VCC-SYST-A026-SF

-6.47E-03 SSS NO SW L310220CQGSSBB008 8.98E-03 SSB NO ISFSI L310218CJGSSS-C005

-5.62E-04 555 NO SW L310220CJGSSSA001 3.93E-02 SSS NO ISFSI L31O218CJGSSS-C006 3.19E-03 SSS NO SW L310220CJGSSSA002

-1.32E-02 SSB NO ISFSI VCC-SYST-A028-SF 5.99E-03 SSS NO SW L310220CJGSSSA003 2.54E-02 SSS NO ISFSI VCC-SPL1-A029-SF

-5.77E-03 SSS NO SW 1_310220CJGSSSA004 2.43E-01 SSS YES ISFSI VCC-SYST-A030-SF

-5.41E-03 SSS NO SW L310220CJGSSSA005 1.93E-01 SSB YES ISFSI VCC-SYST-A029-SF 2.89E-04 SSS NO SW L310220CJGSSSA006 4.91E-02 SSS NO ISFSI VCC-SYST-A029-SF 1.25E-02 SSS NO SW L310220CQGSSSA006 5.45E-02 SSS NO ISFSI 1L310218CSGSSS-A023

-4.09E-03 SSS NO SW L310220CJGSSBA001

-2.05E-02 SSB NO ISFSI L310218CSGSSS-A023 8.40E-04 SSS NO SW L310220CJGSSBA002

-1.42E-02 SSS NO ISFSI L310218CSGSSS-A029 1.22E-02 SSS NO SW L310220CJGSSBA003 7.52E-03 SSB NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 34 of 38 SCs-137 Result pCi/g 4.1OE-02 Cs-137 Result pCi/g 2.42E-02 SS NO IW L.1ULLOUUJLIbPUU4.

I I

SW II1A1*2ACICGSSRAOOS 1.10EF-01 SSS5 YES SW L310221CSGSSBA019

-5.81E-03 SB NO SW L310220CJGSSBA006

-2.96E-02 SSB NO SW L310221CSGSSBA020 8.22E-03 SB NO SW L31O22OCQGSSBA006 6.55E-03 SSB NO SW 1310221CSGSSBA021 2.77E-02 55 NO SW L31O220CJGSSSA0O1 3.37E-O1 SSB YES SW L31O221CSGSSBAO22 8.72E-03 SB NO SW L310220CJGSSSA002 1.11E-01 SSB NO SW L310221CSGSSBA023 4.70E-02 SB NO SW L31022OCJGSSSA003 1.79E-O1 SSS YES SW L31O221CSGSSBAO24

-1.31E-02 SB NO SW L31022OCJGSSSAO04 1.20E-O1 SSB YES SW L31O221CSGSSBA025 8.74E-03 SB NO SW L31O220CJGSSSA005 1.09E-01 SSB YES SW L31O221CSGSSBA026 1.43E-02 SB NO SW L31022OCQGSSSA005 1.64E-01 SSB YES SW L31O221CSGSSBAO27 3.46E-03 SB NO SW L31O220CJGSSBAOO1

-1.48E-03 SSB NO SW L31O221CSGSSBAO28 1.69E-02 SB NO SW L31O220CJGSSBAOO2 1.52E-O1 SSB YES SW L31O221CSGSSBAO29 5.33E-03 SS NO SW L31O220CJGSSBA0O3 1.27E-O1 SSS YES SW L31O221CSGSSBA03O

-8.51E-03 SB NO SW 1L31022OCJGSSBAOO4

-1.90E-02 SSS NO SW L310221CQGSSSAO01 8.29E-03 SB NO SW L31022OCJGSSBAOO5 2.42E-02 SSB NO SW L310221CQGSSSA016 1.79E-02 SB NO SW L31O22OCQGSSBAOOS 3.16E-03 SSB NO SW L31O221CSGSSSAOO1 1.88E-02 SS NO SW L31O221CQGSSBAOO1 3.03E-02 SSB NO SW L310221CSGSSSA002

-2.48E-03 SS NO SW L310221CQGSSBAO16 1.30E-02 SSB NO SW L310221CSGSSSA003 5.03E-02 SB NO SW L310221CSGSSBAOO1 6.07E-02 SSB NO SW L31O221CSGSSSAOO4 4.22E-02 SS NO SW L310221CSGSSBA0O2

-5.28E-04 SSS NO SW L31O221CSGSSSAO05 1.14E-02 SS NO SW L310221CSGSSBAO03 4.41E-02 SSS YES SW L310221CSGSSSA006 3.98E-02 SB NO SW L31O221CSGSSBAO04 1.74E-02 SSS NO SW L310221CSGSSSA007 2.79E-02 SB NO SW L31O221CSGSSBAO05 7.05E-03 SSS NO SW L310221CSGSSSA008 1.40E-03 SB NO SW 1310221CSGSSBA006 1.69E-02 SSS NO SW L310221CSGSSSA009 8.1OE-03 SB NO SW 1.310221lCSGSSBA007 7.52E-04 SSS NO SW L31O221CSGSSSAO10 2.07E-02 SS NO SW L310221CSGSSBA008

-8.18E-03 SSB NO SW L31O221CSGSSSAO12 7.35E-03 SB NO SW L310221CSGSSBAO09 2.11E-02 SSB NO SW L310221CSGSSSA012 4.90E-02 SS NO SW L31O221CSGSSBAO12 6.02E-04 SSS NO SW L310221CSGSSSA013 1.15E-O1 SS YES SW L31O221CSGSSBAO12 1.08E-03 SSB NO SW L310221CSGSSSA013 1.29E-O1 SB YES SW L31O221CSGSSBAO13 4.27E-02 SSS NO SW L310221CSGSSSA015 1.94E-02 SB NO SW 1310221CSGSSBA014

-5.21E-03 SSB NO SW L310221CSGSSSA016 2.03E-02 SB NO SW L310221CSGSSBA015

-3.23E-03 SSB NO SW L310221CSGSSSA017 2.57E-02 SS NO SW L31O221CSGSSBAO16 4.90E-03 SSS NO SW L310221CSGSSSA018 5.27E-03 SS NO SW L31O221CSGSSBAO17 6.13E-03 SSB NO SW L310221CSGSSSA019 2.02E-02 SS NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 35 of 38 SCs-137 Result pCi/g 4.15E-02 Cs-137 Result pCi/g 1.19E-01 SSs YES IW Lj+/-UZZL1Lb)b)AULU

-4 I.

4 SW IL310221CSGSSSA021 2.32E-01 SB YES SW 1310220CRGSSSC007 2.35E-01 SB YES SW L310221CSGSSSA021 1.90E-O1 SSS YES SW L310220CRGSSSCO08 3.03E-O1 SSB YES SW L310221CSGSSSA022 9.25E-02 SSS YES SW L310220CRGSSSC012 3.80E-02 SSS NO SW L310221CSGSSSA022 1.17E-01 SSS YES SW L310220CRGSSSC016 1.49E-01 SSS YES SW L310221CSGSSSA023 9.46E-03 SSS NO SW L310220CRGSSSC024 9.97E-02 SSB YES SW L310221CSGSSSA024 2.13E-02 SSS NO SW L310220CRGSSSCO01 1.27E-01 SSS YES SW L310221CSGSSSA025 6.27E-02 SSB NO SW L310220CRGSSSC002 1.45E-02 SSB NO SW L310221CSGSSSA026 S.75E-02 SSS NO SW L310220CRGSSSC003 9.79E-03 SSB NO SW L310221CSGSSSA02 1.83E-02 SSB NO SW L310220CRGSSSCO04 2,78E-01 SSB YES SW L310221CSG5SSA028

-9,88E-04 SSB NO SW L310220CRGSSSC00 2.86E-02 SSS NO SW L310221CSGSSSA029

-2.32E-02 SSS NO SW L310220CRGSSSC006 2.10E-01 SSS YES SW 1310221CSGSSSA030 1.65E-02 SSS NO SW L310220CRGSSSC009 2.63E-02 SSS NO SW 1310220CJGSSS001

-5.55E-03 SSS NO SW L310220CRGSSSC010 8.59E-02 SSS YES SW L310220CJGSSS001 1.13E-02 SSS NO SW L310220CRGSSSC011 2.58E-03 SSB NO SW L310220CJGSSSO02 9.53E-O2 SSS YES SW L310220CRGSSSC013 2.94E-02 SSB NO SW L310220CJGSSSO03 1.13E-O1 SSB YES SW L310220CRGSSSC014 3.O7E-O1 SSB YES SW L310220CJGSSS004 2.41E-01 SSS YES SW L310220CRGSSSC017 1.O5E-O1 SSS YES SW L310220CJGSSS008 3.90E-01 SSS YES SW L310220CRGSSSC018 1.04E-01 SSS YES SW L310220C1GSSSB001 1.37E-02 SSS NO SW 1310220CRGSSSC019 5.00E-01 SSS YES SW L310220C1GSSSB002 1.01E-02 SSB NO SW L310220CRGSSSC021 9.23E-02 SSB NO SW L310220CIGSSBBO01 2.10E-02 SSS NO SW L310220CRGSSSC022 7.28E-O1 SSB YES SW L310220CIGSSBB002 1.99E-02 SSB NO SW L310220CRGSSSC023 1.64E-01 SSS YES SW L310220CIGSSSO10 2.87E-01 SSB YES SW L310220CRGSSSC025 3.25E-03 SSB NO SW L310220C1GSSS011 2.25E-01 SSB YES SW L310220CRGSSSC026 1.19E-02 SSB NO SW L310220C1GSSS012 3.71E-01 SSB YES SW L310220CRGSSSC027 8.20E-02 SSB NO SW L310220ClGSSS013 1.29E-01 SSB YES SW L310220CRGSSSC028 2.80E-01 SSS YES SW 1310220CIGSSS014 2.79E-01 SSB YES SW L310220CRGSSSC029 1.66E-01 SSS YES SW L310220C1GSSSC015 9.03E-01 SSS YES SW L310220CRGSSSC030 5.12E-02 SSS NO SW L310220C1GSSSC016 2.40E-01 SSB YES SW L310220CRGSSSCO31 2.07E-01 SSS YES SW L310220CIGSSSC017 1.14E+00 SSS YES SW L310220CR0SSSC025 1.07E-02 SSB NO SW L310220C1GSSSC018 1.35E-01 SSS YES SW L310220CJGSSSBO01 2.71E-01 SSS YES SW L310220C1GSSSC019 2.90E-01 SSS YES SW L310220CJGSSSB001 2.74E-01 SSS YES SW L310220C1GSSSC020 3.23E-01 SSS NO SW L31022OCJGSSBB001 5.81E-02 SSS NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 36 of 38 SCs-137 Result pCi/g 1,02E-01 Cs-137 Result pCi/g 1.80E-02 4.42E-03

.VW L,51ULLUtJ*3I)tUUL SW IL310220CJGSSBBO02 I1.13E-01 I SSS YES SW L310220CSGSSSB018 NO SW L310220CJGSSSB003 1.30E-01 SSB YES SW L310220CSGSSSB019 5.41E-02 SSB NO SW L31022OCJGSSBB003 4.09E-02 SSS NO SW L310220CSGSSSB020

-2.91E-03 SSB NO SW L31022OCJGSSSB004 3.18E-02 SSS NO SW L310220CSGSSSB021 2.74E-02 SSS NO SW L310220CJGSSBBO04 1.24E-01 SSB YES SW L310220CSGSSSB022 1.66E-03 SSS NO SW L31O220CJGSSSB005 6.57E-02 SSS NO SW L310220CJGSSSA001 3.00E-02 SSS NO SW L310220CJGSSBB005

-8.06E-04 SSS NO SW L310220CJGSSSA001 3.93E-02 SSS NO SW L310220CJGSSSB006 6.84E-02 SSS NO SW L310220CJGSSBA001

-2.05E-02 SSB NO SW L310220CJGSSBBO08 9.77E-03 SSB NO SW L310220CJGSSSA002

-1.32E-02 SSB NO SW L310220CIGSSSB007 3.37E-02 SSB NO SW L310220CJGSSBA002

-1.42E-02 SSB NO SW 1310220CJGSSBB007 4.08E-02 SSS NO SW L310220CJGSSSA006 4.91E-02 SSB NO SW L310220CJGSSSB008 7.69E-02 SSS NO SW L310220CQGSSSA006 5.45E-02 SSS NO SW L310220CQGSSSB008 6.77E-02 SSS YES SW L310220CJGSSBA006

-2.96E-02 SSS NO SW L31O220ClGSSBB001 2.10E-02 SSB NO SW L310220CQGSSBA006 6.55E-03 SSS NO SW 1.310220CIGSSBB002 1.99E-02 SSS NO SW 1310220CJGSSSA003 2.54E-02 SSS NO SW L310220CIGSSSB001 1.37E-02 SSS NO SW L310220CJGSSBAO03 7.52E-03 SSS NO SW L310220CIGSSSB002 1.01E-02 SSS NO SW L310220C1GSSSA004 2.43E-01 SSS YES SW L310220CQGSSBB014 3.30E-02 SSS NO SW L310220CJGSSBA004 4.10E-02 SSS NO SW L310220CSGSSSB001 3.48E-02 555S NO SW L310220CJGSSSA005 1.93E-01 SSS YES SW L310220CSGSSSB002 4.09E-02 SSS NO SW L310220CJGSSBA005 1.10E-01 SSS YES SW L310220CSGSSSB003

-3.84E-03 SSS NO SW L310220CJGSSB8008 1.87E-01 SSB YES SW L310220CSGSSSB004 1.10E-02 SSB NO SW L310220C0GSSB8008 8.98E-03 SSS NO SW L310220CSGSSSB005 1.42E-02 SSS NO SW 1310220C0GSSBA014 1.89E-02 SSB NO SW L310220CSGSSSB006

-3.96E-03 SSS NO SW L310220CSGSSBAO01 4.27E-03 SSS NO SW L310220CSGSSSB007 4.14E-02 SSS NO SW L310220CSGSSBA002 1.35E-02 SSS NO SW L310220CSGSSSB008 2.22E-02 SSS NO SW 1310220CSGSSBA003 4.12E-02 SSS NO SW 1310220CSGSSSB009 1.88E-03 SSS NO SW L310220CSGSSBA004 2.31E-02 SSB NO SW L310220CSGSSSB010 5.28E-02 SSS NO SW L310220CSGSSBA005 1.32E-02 SSB NO SW L310220CSGSSSBO11 1.72E-02 SSB NO SW L310220CSGSSBA006

-6.68E-04 SSS NO SW L310220CSGSSSB013 7.68E-02 SSB YES SW L310220CSGSSBA007 4.78E-03 SSB NO SW L310220CSGSSSB014 2.32E-02 SSB NO SW L310220CSGSSBA008 7.76E-02 SSS NO SW L310220CSGSSSB015 4.04E-02 SSB NO SW L310220CSGSSBA009 0.OOE+00 SSS NO SW L310220CSGSSSB016 7.54E-03 SSS NO SW L310220CSGSSBA010

-9.42E-03 SSS NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 37 of 38 Cs-237 Result pCi/g Cs-137 Result pai/g SW 1.31UIIUL5655BA011 3.76E-02 SS5 NO SW 310220CS6~555A022 1.79E-02 SSS N

SW L310220CSGSSBA012 5.68E-03 SSS NO SW L310219CJGSSSA001 2.39E-01 S55 YE SW 1.310220CSGSSBA013

-2.32E-03 SSS NO SW L310219CJGSSSA001 3.37E-01 SSS YE SW L310220CSGSSBA014 3.91E-03 SSS NO SW L310219CJGSSBA001

-1.48E-03 SSS N

SW 1310220CSGSSBA015 1.85E-02 SSS NO SW L310219C1GSSSA002 1.11E-01 SSB N

SW L310220CSGSSBA016

-1.63E-02 SSS NO SW L310219CJGSSBA002 1.52E-01 SSB YE SW L310220CSGSSBA017 1.04E-02 SSS NO SW L310219CJGSSSA003 1.79E-O1 SSB YE SW L310220CSGSSBA018 1.70E-02 SSS NO SW L310219CJGSSBA003 1.27E-01 SSS YE SW 1310220CSGSSBA019 1.67E-02 SSS NO SW 1310219CJGSSSA004 1.20E-01 SSB YE SW L310220CSGSSBA020

-3.00E-02 SSS NO SW L310219CJGSSBA004

-1.90E-02 SSS N

SW L310220CSGSSBA021 2.57E-02 SSB NO SW L310219CJGSSSA005 1.09E-O1 SSS YE SW L310220CSGSSBA022 1.94E-02 SSS NO SW L310219CQGSSSA005 1.64E-01 SSS YE SW L310220CQGSSSAO14 3.33E-02 SSS NO SW L310219CJGSSBAO05 2.42E-02 SSS N

SW L310220CSGSSSA001 2.19E-03 SSB NO SW L310219CQGSSBA005 3.16E-03 SSS N

SW L310220CSGSSSA002 5.32E-02 SSS NO SW L310219COQGSSBA009 5.33E-02 SSS N

SW L310220CSGSSSA003 6.49E-02 SSS YES SW L310219CSGSSBA001 5.44E-02 SSB N

SW 1310220CSGSSSA004 9.49E-02 SSS YES SW L310219CSGSSBA002 4.64E-02 SSB N

SW L310220CSGSSSA005 2.66E-02 555 NO SW L310219CSGSSBA003 7.44E-03 SSS N

SW L310220CSGSSSA006 2.07E-04 SSS NO SW L310219CSGSSBA004 1.37E-03 SSS N

SW L310220CSGSSSA007 7.12E-02 SSS NO SW L310219CSGSSBA005

-1.22E-03 SSS N

SW L310220CSGSSSA008 4.76E-02 SSS NO SW L310219CSGSSBA006 3.05E-02 SSS N

SW L310220CSGSSSA009 2.02E-02 SSS NO SW 1310219CSGSSBAO07 1.69E-02 SSS N

SW L310220CSGSSSA010 1.38E-02 SSS NO SW L310219CSGSSBA008 8.75E-02 SSS N

SW L31022OCSGSSSA011 0.O0E+00 SSS NO SW L310219CSGSSBA009 1.68E-02 SSB N

SW L310220CSGSSSA012

-1.30E-02 SSS NO SW L310219CSGSSBA0010

-3.87E-03 SSS N

SW L310220CSGSSSA013

-4,84E-03 SSS NO SW L310219CSGSSBA0011 2.92E-02 SSS N

SW L310220CSGSSSA014 9.09E-03 SSB NO SW L310219CSGSSBA0012 7.74E-04 SSS N

SW L310220CSGSSSA015 1.47E-02 SSB NO SW L310219CSGSSBA0013 4.05E-02 SSS N

SW L310220CSGSSSA016 8.58E-03 SSS NO SW L310219CSGSSBA0014 1.57E-02 SSS N

SW L31O220CSGSSSA017

-5.49E-03 SSS NO SW L310219CSGSSBAO015 2.23E-02 SSS N

SW L310220CSGSSSA018

-6.82E-03 SSB NO SW L310219CSGSSBA0016 4.06E-03 SSS N

SW L310220CSGSSSA019 3.49E-02 SSS NO SW L310219CSGSSBA0017 6.96E-03 SSS N

SW L310220CSGSSSA020 3.75E-03 SSB NO SW L310219CSGSSBA0018 9,52E-03 SSS N

SW L310220CSGSSSA021 2.38E-03 SSS NO SW L310219CSGSSBA0019 2.68E-02 SSS N

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 38 of 38 Cs-137 Result pCi/g 9.09E-03 Cs-137 Result pCi/g 1.83E-02 2.13E-02 SW I I3U1C(SiIO2

+

I SW I L310219CQGSSSA009 I 1.35E-02 I SSS NO I

SW L310219CSGSSSA011 SSS NO NO SW L310219CSGSSSA001 1.06E-01 SSS NO I

SW L310219CSGSSSA012 5.19E-02 SSS

,NO SW L310219CSGSSSA002 1.49E-02 SSS NO I

SW L310219CSGSSSA013 2.63E-02 55S5 NO SW L310219CSGSSSA003 3.30E-02 SSS NO I

SW L310219CSGSSSA014 6.41E-02 SSS NO SW L310219CSGSSSA004 4.21E-02 SSS NO I

SW L310219CSGSSSA015 3.08E-02 SSS NO SW L310219CSGSSSAO05 5.82E-02 SSS NO I

SW L310219CSGSSSA016 2.53E-02 SSS NO SW L310219CSGSSSA006 3.84E-02 SSS NO I

SW L310219CSGSSSA017 2.93E-02 SSS NO SW L310219CSGSSSA007 3.66E-02 SSS NO I

SW L310219CSGSSSA018 9.14E-03 SSS NO SW L310219CSGSSSA008 1.30E-02 SSS NO I

SW L310219CSGSSSA019 1.02E-02 SSS NO SW L310219CSGSSSA009 1.88E-02 SSS NO I

SW L310219CSGSSSA020 4.20E-03 SSS NO

ZIONSOLUTIONSLLc An EnergySolullons Company 10 CFR 50.83(b) 10 CFR 50.4(b)(1)

January 26, 2016 ZS-2016-0014 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-000 1 Zion Nuclear Power Station, Units 1 and 2 Facility Operating License Nos. DPR-39 and DPR-48 NRC Docket Nos. 50-295 and 50-3 04

Subject:

Zion Station Partial Site Release Request for Additional Information

References:

1.)

Gerard van Noordennen, ZionSolutions, Letter to U.S. Nuclear Regulatory Commission, "Zion Station Request for Partial Site Release," dated August 27, 2015 2.)

John B. Hickman, U.S. Nuclear Regulatory Commission, Letter to John Sauger, ZionSolutions, "Request for Additional Information related to Partial Site Release Request for Zion Nuclear Power Station, Units 1 and 2," dated November 3, 2015 ZionSolutions, the licensee for Zion Nuclear Power Station, submitted a request to the Nuclear Regulatory Commission (NRC) to remove a portion of the site from the Part 50 licenses (License Nos. DPR-39 and DPR-48) in accordance with 10 CFR 50.83(b), "Release of a power reactor facility or site for unrestricted use," as documented in Reference 1. Following initial NRC review, a Request for Additional Information (RAI), as documented in Reference 2, was received on November 3, 2015.

Responses to the three issues identified in the referenced RAI are provided in Enclosure 1. contains requested reference documentation.

There are no regulatory commitments made in this submittal. If you should have any questions regarding this submittal, please contact Robert Yetter at (224) 789-4250.

VP of Construction and D&D 101 Shiloh Boulevard, Zion

• IL 60099 (224) 789-4016

• Fax: (224) 789-4008 *www.zionsolutionscompany.com

ZionSolutions, LLC ZS-2016-0014 Page 2 of 2

Enclosures:

RAI Issue Responses :

Reference Documentation containing:

• LTP Reference 2-21, "Determination of Radionuclide Activity Concentrations in Soils in Non-Impacted Soils Adjacent to the Zion Nuclear Station"

• LTP Reference 2-22, TSD-13.-004, "Examination of Cs-137 Global Fallout in Soils at Zion Station" cc:

John Hickman, U.S. NRC Senior Project Manager (2 copies of the enclosures)

Regional Administrator, U.S. NRC Region III (1 copy of the enclosures)

Service List (Cover letter only, no enclosures)

Zion Nuclear Power Station, Unit 1 and 2 License Transfer Service List cc:

Ken Robuck Group President Disposal and Decommissioning EnergySolutions 299 South Main Street, 17th Floor Salt Lake City, UT 841.11 John Sauger Executive VP & General Manager ZionSolutions, LLC 101 Shiloh Boulevard Zion, IL 60099 Gerard van Noordennen VP Regulatory Affairs ZionSolutions, LLC 101 Shiloh Boulevard Zion, IL 60099 Anthony Orawiec Decommissioning Plant Manager ZionSolutions, LLC 101 Shiloh Boulevard Zion, IL 60099 Dan Shrum Senior VP Regulatory Affairs EnergySolutions 299 South Main Street, 17th Floor Salt Lake City, UT 84111 Russ Workman General Counsel EnergySolutions 299 South Main Street, 17th Floor Salt Lake City, UT 84111 Alwyn C. Settles Section Head, Nuclear Facility Inspection Bureau of Nuclear Facility Safety Illinois Emergency Management Agency 1011 North Street, P0 Box 250 Mazon, IL 60444 Kelly F. Grahn Senior Health Physicist, Unit Supervisor Illinois Emergency Management Agency Bureau of Radiation Safety, Environmental Management 245 W Roosevelt Road, Building 8, Suite 55 West Chicago, IL 60185 Kent McKenzie Emergency Management Coordinator Lake County Emergency Management Agency 1303 N. Milwaukee Avenue Libertyville, IL 60048-1308 John E. Matthews Morgan, Lewis & Bockius LLP 1111 Pennsylvania Avenue, NW Washington, DC 20004

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Zion Partial Site Release Response to RA~s 1 through 3

ZionSolutions, LLC ZS-2016-001!4: Enclosure 1 Page 1 ofl14

1. Comment: The determination of background values for Cs-137 needs clarification.

Basis: Section 2.3.1 summarizes the three background studies performed at the site (February 2012 ESCSG Study, March 2012 Crib House Study, and July 2012 ZionSolutions Soil Study).

During the first study in February of 2012, 15 samples of concrete, asphalt and soil were collected from the Vertical Concrete Cask Construction area. This study determined that only natural radioactivity was detected. The second study, during which concrete core samples were taken from the Crib House, also determined that only natural radioactivity was detected. In the third study of soil samples from Hosah Park, Cs-137 was identified in addition to naturally occurring radionuclides. In the Hosah Park study, 30 soil sample locations were chosen where static measurements were taken, as well as surface and subsurface volumetric samples. It is postulated that the Cs-137 is attributable to global fallout. The LTP states that while there did appear to be evidence of soil disturbance at Hosah Park, the evidence suggested that this occurred in the past and the land has been undisturbed for a number of years. The study concluded that the majority of the soil samples from Hosah Park were from disturbed soils. The Hosah Park results are summarized in Table 2-10, which shows an average of 0.0626 pCi/g and a maximum of 0.241 pCi/g.

Section 2.3.1.4 of the LTP states "The soil sample data compiled in the TSD concludes that the majority of the soil samples taken for the background studies were from disturbed soils. The Hosah Park data as well as the data obtained during the ESCSG study corresponded with documented fallout levels from disturbed soil at sites in Massachusetts, New York and Pennsylvania. Consequently, predicted ranges for background concentrations of Cs-137 were established for disturbed soils as well as undisturbed soils based on literature. These ranges are presented in Table 2-11. The upper Cs-137 concentration for each category was used as the investigation levels for non-impacted open land survey units. The upper Cs-137 concentration for disturbed, non-drainage in Table 2-11 was used as the investigation level for Class 2 and 3 open land area survey units."

Section 2.3.1.4 of the LTP suggests that the background study data from the Hosah Park and ESCSG study corresponded to global fallout levels; the LTP does not provide a basis for why this conclusion was reached even though Cs-137 was not found in the ESCSG Study or Crib House Study. The upper values of global fallout ranges were assigned as investigation levels for Cs-137 when initially characterizing the survey units. Table 2-11 provides Investigative Levels for Cs-137 Based on Background Studies. The upper value for undisturbed soil is 2.8 pCi/g or 0.66 pCi/g for a drainage or non-drainage area respectively. The upper value for disturbed soil in drainage area is 1.67 pCi/g. The upper value for a disturbed, non-drainage area, which was used for Class 2 and 3 open land area survey units, is 0.34 pCi/g. These upper values are well above the average of 0.0626 pCi/g or maximum of 0.241 pCi/g found in Hosah Park. The LTP does not provide a basis for using the upper values of the global fallout ranges from Massachusetts, New York and Pennsylvania, as opposed to the site-specific data.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 2 of 14 NUREG 1757 Vol. 2, Rev. 1, Section A.3.2, providing guidance on soil reference areas, states that "if there is a choice of possible reference areas with similar soil types, consideration should be given to selecting reference areas that are most similar in terms of other physical, chemical, geological, and biological characteristics." Section A.3.4 provides additional guidance on differences in background areas.

Path Forward:

a. Provide a basis for why the ESCGG study corresponds to documented global fallout ranges, even though Cs-137 was not found in the ESCSG study.

b. Provide a basis for assuming the upper values of the global fallout ranges from Massachusetts, New York and Pennsylvania as investigation levels, as opposed to the site-specific background reference data.

ZSRP Response (la and lb) - It should be first noted that analytical data reported as "Surface Soil Sample Analysis Results" for the July 2012 Hosah Park background assessment in Chapter 2, Table 2-10 was a modified result of the subsurface soil analysis data. Table 2-10 in LTP Chapter 2 will be revised to present both the reported surface and subsurface soil analysis data from EnergySolutions report "Determination of Radionuclide Activity Concentrations in Soils in Non-Impacted Soils Adjacent to the Zion Nuclear Station" - July 2012 as described in section 2.3.1.3. The revised Table 2-10 is presented below; Revised LTP Table 2-10 Hosah Park Background Assessment Sample Analysis Surface Soil Sample Analysis Results K-40 6.96E+00 8.95E+00 9.01E-01 Co-60

-3.19E-02 2.87E-02 1.88E-01 Sr-90

-6.03 E-04 5.26E-02 2.41 E-02 Cs-137 2.11E-01 6.51E-01 1.48E-01 Th-228 1.72E-01 4.30E-01 1.1 8E-0 1 Th-230 3.45E-01 2.07E+00 3.55E-01 Th-232 1.53E-01 5.11E-01 1.04E-01 U-234 2.03 E-01 1.74E+00 3.23 E-01 U-235 1.40E-02 1.37E-01 3.24E-02 U-238 2.11E-01 1.86E+00 3.24E-01

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 3 ofl14 Subsurface Soil Sample Analysis Results K-40 6.62E+00 8.59E+00 9.49E-0 1 Co-60 3.72E-04 3.79E-02 1.38E-02 Sr-90 4.40E-03 5.30E-02 2.16E-02 Cs-137 2.64E-02 2.41 E-O01 6.00E-02 Th-228 1.26E-01 4.50E-01 1.1 4E-0 1 Th-230 3.28E-01 8.11lE-01 2.09E-01 Th-232 1.21E-01 4.05E-01 9.54E-02 U-234 1.25E-01 7.36E-01 1.57E-01 U-235 1.05E-02 1.10E-01 2.43 E-02 U-238 1.31E-01 6.65E-01 1.47E-01 a

Bold values indicate concentration(s) greater than MDC. Italicized values indicate MDC value.

ZionSolutions TSD 13-004 "Examination of Cs-137 Global Fallout in Soils at Zion Station" evaluated the Hosah Park background data from the July 2012 background report above, combined with data from the ESCGG background report from February 2012 (that was also conducted in Hosah Park). The initial finding was that the combined Hosah Park data only represented soil from an area that was categorized as "disturbed non-drainage". Other soil types such as "disturbed drainage"~ or "undisturbed drainage" are known through literature to contain higher Cs-137 background concentrations from fallout then "disturbed non-drainage" soils. Four different soil types were identified that could have different Cs-137 backgrounds:

disturbed non-drainage disturbed drainage undisturbed non-drainage undisturbed drainage In order to address all four of the potential soil types expected to be encountered during the survey of non-impacted areas at Zion, the study "Investigations of Natural Variations of Cesium-137 Concentrations in Residential Soils" (prepared for the Health Physics Society 39th Annual Meeting in June 1994) was reviewed. This study was based on the analysis of a large population (600 sample locations from over 200 properties) of soil samples taken in New York, Massachusetts, and Pennsylvania. The specific sites reviewed in this study are all within the same atmospheric fallout region as Zion and is therefore considered applicable to Zion.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 4 of 14 Based on the analyses of the combined Hosah Park data sets, TSD 13-004 concluded that the combined Hosah Park data for Cs-137 (February 2012 ESCGG combined with the July 2012 data) fit well with fallout levels reported for disturbed non-drainage soils in the study. The maximum measured concentration of Cs-137 for disturbed non-drainage areas in the study was 3.40E-01 pCi/g with an upper 95th percentile of4.20E-01 pCi/g. This compares favorably with the combined Hosah Park data with a maximum Cs-137 concentration of 6.51E-01 pCi/g and an upper 95% confidence level of 3.95E-01 pCi/g.

TSD 13-004 also concludes that the Hosah Park location is not necessarily indicative of the Cs-137 background levels that would be expected in drainage areas, wetlands or undisturbed forest areas which are not in the undisturbed non-drainage soil category. As no site-specific background data was available for the other soil types and, taking into consideration that the combined Hosah Park data was reasonably correlated with disturbed non-drainage soils in the study, TSD 13-004 concludes that it was appropriate to use the decay corrected Luzerne County PA data from the study as investigation levels (maximum value) and action levels (upper 95th percentile value) for all disturbed and undisturbed soils for drainage and non-drainage areas.

These values are reported in Table 2-1 1 from LTP Chapter 2 which is reproduced below; LTP Table 2-11 Investigative Levels for Cs-137 Based on Background Studies Undisturbed0.0t2.004to36 Disturbed 0.00 to 1.67 0.35 to 2.86 Non-Drainage Areas Surface 0-10 cm Undisturbed 0.23 to 0.66 0.15 to 0.77 Disturbed 0.27 to 0.34 0.23 to 0.42 If during the surveys of the non-impacted survey units, a measurement (ISOCS or surface soil sample) exceeded the investigation level for a given soil type (upper value for the measured range for the applicable soil type), then an investigation would have been performed. If a measurement (ISOCS or surface soil sample) exceeded the upper 95th percentile for a given soil type, then the area would have been reclassified as impacted. The disturbed and undisturbed soil Cs-137 levels from Table 2-11 were also used as action levels to assess the classification of Class 3 open land area survey units.

c. Provide "Determination of Radionuclide Activity Concentrations in Soils in Non-Impacted Soils Adjacent to the Zion Nuclear Station" (Reference 2-21)

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 5 ofl14 ZSRP Response (lc) - LTP Reference 2-21, "Determination of Radionuclide Activity Concentrations in Soils in Non-Impacted Soils Adjacent to the Zion Nuclear Station" is provided as Enclosure 2 of this submittal.

d. Provide ZionSolutions TSD 13-004, "Examination of Cs-13 7 Global Fallout In Soils At Zion Station" (Reference 2-22)

ZSRP Response (ld) - LTP Reference 2-22, TSD 13-004, "Examination of Cs-137 Global Fallout in Soils at Zion Station" is provided as Enclosure 2 to this submittal.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 6 of 14

2. Comment: The use of Cs-137 global fallout values as an investigation level during site characterization and initial survey unit classification needs clarification.

Basis: Section 2.3.1.4 of the LTP states that the upper values of global fallout ranges were assumed as background for Cs-137 when characterizing the open land survey units. However, it is not clear how this assumption impacted the initial classification of survey units (if at all).

It is also not clear if the global fallout levels were also assumed as background in characterizing survey units consisting of concrete, asphalt, or piping. NUREG 1757 Vol. 2, Section A.3.3, states that "when there are different materials with substantially different backgrounds in a survey unit, the licensee may use a reference area that is a non-impacted room with roughly the same mix of materials as the survey unit. If a survey unit contains several different materials, but one material is predominant or if there is not too great a variation in background among materials, a background from a reference area containing only a single material may still be appropriate. However, the licensee should demonstrate that the selected reference area will not result in underestimating the residual radioactivity on other materials." The LTP suggests that the Hosah Park soil background reference area will be applied for the open land areas. It is not clear if the global fallout values will be assumed for background in other materials such as concrete, asphalt, or piping.

Table 2-31 summarizes the characterization for Class 3 Open Land Survey Units. The footnote on Table 2-31 (pg 2-153) for Survey Unit 10220C (south of the Radiological Restricted Area) indicates that while 41 out of 55 samples exceeded the MDC for Cs-137, with the maximum being 1.14 pCi/g Cs-137, an investigation concluded that the elevated levels of Cs-137 are due to global fallout. However, the details of this investigation for Survey Unit 1 0220C do not seem to be discussed in the body of the LTP.

Path Forward:

a. Define the term investigation level as applied during initial classification of survey units.

ZSRP Response (2a) - The initial classification of survey units at Zion were based on the information compiled in the Zion HSA. From June to September 2013, characterization surveys were performed in the open land areas of the site that were classified as non-impacted in the Zion HSA. The objective was to acquire sufficient radiological survey data to confirm the "non-impacted" classification and to provide reasonable assurance that the survey units in question were free of detectable plant-derived radioactive material.

The characterization survey consisted of both qualitative evaluations and quantitative analysis results. The qualitative evaluation consisted of static measurements using the Canberra In Situ Object Counting System (ISOCS). Gamma scans were performed using a Ludlum Model 23 50-1 and a Model 44-10 NaI detector. The ISOCS MDC and gamma scanning sensitivities were estimated based on the assumed geometry and the potential plant-derived gamma-emitting radionuclides that could hypothetically be present. Quantitative radionuclide specific analysis of surface soil was performed using a calibrated counting geometry. Analysis times were set to achieve the required MDCs that were based on the most limiting expected Cs-137 background due to global fallout as set forth in TSD 13-004, i.e., the maximum measured range value for disturbed non-drainage soils (3.40E-01 pCi/g).

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 7 of 14 The results of the ISOCS and soil sample analysis were compared to the appropriate background value commensurate with the soil type (as presented in Table 2-11 of LTP Chapter 2). The Cs-137 background values in Table 2-11 are reproduced from TSD 13-004 and are based on the decay corrected Luzerne County PA data from the study "Investigations of Natural Variations of Cesium-1 37 Concentrations in Residential Soils". As stated in ZSRP RAI response #1 a and lb, the maximum value of the measured range for each of the four soil categories (disturbed non-drainage, disturbed drainage, undisturbed non-drainage and undisturbed drainage) was used as the investigation level for these surveys. If during the performance of these surveys, any measurement exceeded these values, then it would have been considered as indicative of the possible presence of plant-derived radioactivity. The investigation levels were not exceeded and no investigations were performed.

b. Clarify how the investigation level may impact whether an open land survey unit area is classified as non-impacted versus impacted.

ZSRP Response (2b) - If during the surveys of the non-impacted survey units, a measurement (ISOCS or surface soil sample) exceeded the investigation level for a given soil type (upper value for the measured range for the applicable soil type), then an investigation would have been performed. If a measurement (ISOCS or surface soil sample) exceeded the upper 95%

confidence level for a given soil type, then the area would have been reclassified as impacted.

A total of 236 ISOCS measurements and 166 surface soil samples were taken during the survey of non-impacted survey units. No plant-derived radionuclide was positively identified (at concentration greater than MDC) other than Cs-137 in any sample or measurement taken. Of the 402 total measurements/samples taken in these survey units, Cs-137 was positively identified at a concentration greater than the instrument MDC in 181 measurements/samples. Of the 181 measurements/samples where Cs-137 was positively identified, 18 measurements/samples results exceeded the most limiting investigation level (3.40E-01 pCi/g applicable to disturbed non-drainage soils). Those samples results are as follows; L4-1021 7-CRGS-SS-01I 5.09E-01 5.8 1E-02 6.94E-02 Wooded area Undisturbed Non-Drainage Undisturbed L4-10217-CRGS-SS-07 5.22E-01 6.46E-02 8.19E-02 Wooded area Non-Drainage Disturbed L4-1021 7-CRGS-SS-10 4.42E-0 1 5.60E-02 5.34E-02 Wooded area Dang Undisturbed L4-1021 7-CRGS-SS-19 3.99E-0 1 6.52E-02 6.42E-02 Wooded area NnDang Undisturbed L4-1021 7-CRGS-SS-23 4.31 E-0 1 5.53E-02 6.91 E-02 Wooded area NnDang

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 8 of 14 L4-10302-VC VGS-00 1 -SS 4.20E-0 1 5.3 1E-02 6.29E-02 Marsh Undisturbed Drainage L4-10302-VCVGS-027-SS 4.64E-01 6.46E-02 8.80E-02 Native Grass Unitre Non-Drainage Undisturbed L4-1I0302-VC VGS-03 3-SS

3. 82E-0 1 5.99E-02 8.98E-02 Wooded area NnDang Undisturbed L4-10303-VCVGS-01 1-SS 3.58E-01 4.57E-02 6.52E-02 Native Grass NnDang Non-Drainage Undisturbed L4-10303-VCVGS-021-SS 3.53E-01 4.74E-02 8.21E-02 Native Grass NnDang Undisturbed L4-1I0406-VCRGS-0327-SS 3.516E-0 1 4.025E-02 4.62E-02 Woodved ara No-ra inag Undisturbed L4-10402-VCRGS-0175-SS 3.51E-0 1 54.25E-02 7.898E-02 Wooded area NnDang Non-Drainage Undisturbed L4-10402-VCRVGS-0311-S S 3.629E-0 1 4.324E-02 57.89E-02 Natived Greass NnDang Undisturbed L4-1I0404-VCRGS-0615-SS 3.81 E-0 1 4.42E-02 3.65E-02 Native Grass NnDang Undisturbed L4-10404-VCVGS-021-SS 3.89E-0 1 4.94E-02 7.410E-02 Woodved ara No-ra inag Undisturbed L4-10404-VCRGS-022-SS 53.96E-0 1 6.978E-02 7.41E-02 Wooded area NnDang As shown above, all but two of the 18 sample locations were categorized as "undisturbed non-drainage" soil. None of the 18 sample results exceeded the investigation level for the "undisturbed non-drainage" soil category (6.60E-01 pCi/g). The two samples not categorized as "undisturbed non-drainage" was classified as "undisturbed drainage" and "disturbed drainage" which both had a higher investigation level of 2.80 pCi/g and 1.67 pCi/g respectively.

Therefore, no investigations were required for any of the non-impacted survey units.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 9 of 14 No measurement taken in any non-impacted survey unit exceeded the upper value for the measured range (from Table 2-11) for all soil types. Therefore, it follows that no measurement/sample result taken in any non-impacted survey unit exceeded the exceeded the upper 95th confidence level for Cs-137 for their respective soil category and that no survey unit required reclassification to "impacted."

c. Evaluate whether initial classifications would change if actual site data were used instead of global fallout data.

ZSRP Response (2c) - ZionSolutions TSD 13-004 "Examination of Cs-137 Global Fallout in Soils at Zion Station" evaluated the Hosah Park background data from the July 2012 study combined with data from the ESCGG background study from February 2012 (that was also conducted in Hosah Park). Based on the analyses of the combined Hosahi Park data sets, the TSD concluded that the combined Hosah Park data for Cs-137 (data set from the February 2012 ESCGG background study in Hosah Park combined with the July 2012 background study in Hosah Park) fit well with fallout levels predicted for disturbed non-drainage soils. The maximum measured concentration of Cs-137 for the combined Hosah Park study was 6.51lE-01 pCi/g and an upper 95% confidence level for the data set of 3.95E-01 pCi/g.

If only the Hosah Park background data set was used, it should be noted that of the 402 total measurements/samples taken in the non-impacted survey units, no measurement of Cs-137 exceeded the maximum observed measurement of Cs-137 (6.51E-01 pCi/g) detected in the combined Hosah Park background data set. Also, of the 402 total measurements/samples taken in the non-impacted survey units, only 11 measurements (2.7%) exceed the upper 95%

confidence level of 3.95E-01 pCi/g for the actual site data set. The table below lists the 11 results exceeding 3.95E-01 pCi/g. Inspection of the table confirms that all of the 11 results are from areas with undisturbed soil types which are expected to have higher Cs-137 fallout background concentrations as described in TSD 13-004. All 11 results are below upper 95%

confidence level for their respective soil type category in Table 2-11.

In conclusion, a very small percentage, i.e., 2.7%, of the 402 non-impacted area measurement/samples slightly exceeded the upper 95% confidence level of the actual site data.

However, all 402 non-impacted area samples were below the maximum individual result from the Hosah Park background data. Also, the 11 samples that slightly exceeded the 3.95E-01 pCi/g upper 95% confidence level were well below the predicted 95% confidence levels for their respective soil type. Zion contends the review of actual site background data provides compelling and defensible support to the conclusion that all non-impacted areas are properly classified.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 10 of 14 L4-1 021 7-CRGS-SS-01 5.09E-0 1 5.8 1E-02 6.94E-02 Wooded area Undisturbed Non-Drainage Undisturbed L4-10217-CRGS-SS-07 5.22E-01 6.46E-02 8.19E-02 Wooded area Non-Drainage Disturbed L4-10217-CRGS-SS-10 4.42E-01 5.60E-02 5.34E-02 Wooded area Dang Undisturbed L4-10217-CRGS-SS-19 3.99E-01 6.52E-02 6.42E-02 Wooded area NnDang Undisturbed L4-1021 7-CRGS-SS-23 4.31 E-0 1 5.53E-02 6.91 E-02 Wooded area NnDang Undisturbed L4-10302-VCVGS-001-SS 4.20E-01 5.31E-02 6.29E-02 Marsh Dang Undisturbed L4-10302-VCVGS-027-SS 4.64E-01 6.46E-02 8.80E-02 Native Grass NnDang Undisturbed L4-10306-VCVGS-032-SS 3.96E-01 6.02E-02 8.62E-02 Native Grass NnDang Non-Drainage Undisturbed L4-1I0402-VCRGS-065-S S 34.21E-0 1 4.42E-02 7.415E-02 Woodved ara No-ra inag Undisturbed L4-10404-VCRGS-023 -SS

5. 70E-0 1 6.5 8E-02 9.69E-02 Wooded area NnDang

d. Describe the analysis that was performed to conclude that the non-impacted areas are indistinguishable from background.

ZSRP Response (2d) - If during the surveys of the non-impacted survey units, a measurement (ISOCS or surface soil sample) exceeded the investigation level for a given soil type (upper value for the measured range for the applicable soil type), then an investigation would have been performed. If during the surveys of the non-impacted survey units, a scan measurement (NaI detector) exceeded the alarm set-point (background plus the MDCR of the instrument), then an investigation would have been performed. If a measurement (IS OCS or surface soil sample) exceeded the upper 95th percentile for a given soil type, then the area would have been reclassified as impacted. These investigation levels were not exceeded during the characterization survey of the non-impacted survey units and no investigations were performed.

Consequently, ZSRP contends that no additional analysis is necessary.

e. Provide the investigation details that concluded that the elevated levels of Cs-i137 in Survey Unit 10220C are due to global fallout.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 11 of 14 ZSRP Response (2e) - Survey unit #L3 10220 is an impacted Class 3 open land survey unit.

While elevated levels of Cs-137 (elevated defined as concentrations greater than the Cs-137 levels observed in the balance of this survey unit or in the adjacent surrounding survey units) were detected and investigated during the characterization, the concentrations of Cs-137 detected (maximum observed concentration of 1.14 pCi/g) would not have changed the classification of this survey unit.

Impacted Class 3 open land survey unit #L3 10220 is the open land area along the southern border of the "Radiologically-Restricted Area". Impacted Class 3 open land survey unit

1. L3 10220, as specified in the HSA, was broken into three (3) smaller Class 3 survey units.

Class 3 survey unit #L31I0220C is the south section of the original Class 3 open land survey unit

1. 10220, as specified in the HSA. The size of the survey unit is 25,560 square meters. The area is predominantly fiat wetlands covered with native grasses and underbrush. "Bull Creek" traverses the center of the survey unit in an east/west direction. The HSA discusses the potential for low levels of radiological contaminates due to elevated enviromnental sample results taken in and at the outfalls of the storm drain system prior to 1980. As required by the survey instructions, a visual inspection was performed to identify any potential subsurface burial sites in this survey unit. No potential burial sites were identified by the inspection.

The survey design for the characterization of this survey unit called for the acquisition of 31 surface soil samples taken at random locations and 5 additional surface soil samples taken at judgmental locations. No subsurface soil samples were included as part of the survey design.

3,453 square meters or approximately 14% of the total surface area in the survey unit was scanned using a Ludlum Model 2350-1 and a Model 44-10 NaI detector.

For the area scanned, the average observed background in the survey unit was 5,395 cpm.

Background was assessed in the survey unit while holding the detector at waist height. The average observed scan measurement was 6,037 cpm with a maximum observed measurement of 8,418 cpm. Nine scan alarms were observed in this survey unit with the scan alarm set-point set at the MDCR plus background. The area exhibiting elevated activity, which was primarily located in and around Bull Creek, was investigated by additional scans and 20 investigative surface soil samples that were acquired at the locations where the scan alarms were observed.

The majority of the samples with elevated Cs-137 concentration were located in and around Bull Creek. The initial samples taken in this area contained Cs-137 levels up to 7.28E-0l pCi/g. As this Cs-137 concentration was significantly greater than those taken in the adjacent soils, investigation samples were taken along the creek bank upstream and downstream. Results of the investigations indicted Cs-137 concentrations along the creek bank ranging from 1.29E-01 pCi/g to 1.1 4E+00 pCi/g. It was postulated that background levels of Cs-137 in the soil surrounding Bull Creek concentrates in this area due to the fluctuating water levels in the creek. The samlples were generally lower in density than most of the other samples in the survey unit, indicating the possible presence of decaying organic matter.

The 56 surface soil samples (random, judgmnental and investigation) and 2 QC split samples were acquired and analyzed by the on-site gamma speetroscopy system. Cs-137 was identified at concentrations greater than the MDC of the instrument in 42 of the surface soil samples taken.

No other potential plant-derived radionuclides were positively identified. The average Cs-137 concentration observed in the analysis of the surface soil samples was 3.20E-01 pCi/g with a

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 12 of 14 maximum observed concentration of 1.1 4E+00 pCi/g. As the area in question was categorized as a disturbed drainage area, all Cs-137 results were less than the upper value of the measured range for that soil category (1.67E+00 pCi/g). Consequently, the investigation concluded that the elevated Cs-137 concentration was due to global fallout.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 13 ofl14

3. Comment: Section 2.2.1 (Data Quality Objectives), Section 2.3.4 (Non-Impacted Open Land Areas), and Section 2.3.5 (lImpacted Open Land Areas)

Section 2.2.1 of the LTP indicates that "direct measurements and scans of concrete and surface soils were also made using the same instruments and Minimal Detectable Concentrations (MDC) as will be employed for FSS," and that "volumetric samples that exhibited the highest activity were sent to an off-site laboratory for analysis of Hard-to-Detect (HTD) radionuclide(s)." This discussion indicates that HTD radionuclides are only measured during characterization when an elevated direct measurement was encountered, but it is not clear that a surrogate correlation has been established between HTD and easy-to-detect radionuclides, or that these radionuclides are co-located at the site. As such, it is not evident that a sufficient number of HTD samples were taken during characterization to establish a surrogate or to adequately characterize the radiological status of the site. For example, Section 2.3.4.1 of the LTP discusses surface soil sampling in non-impacted areas and indicates that "of the total number of surface soil samples taken and analyzed, Cs-137 was identified at concentrations greater than the MDC of the instrument in 106 surface soil samples," and that "no other potential plant-derived radionuclides were positively identified." However, it is not evident from the discussion in Section 2.3.4.1 and the corresponding results summary in Table 2-29 (Non-Impacted Open Land Survey Units -

Characterization Survey Summary) that an analysis of these soil samples was performed for radionuclides other than Cs-137 and Co-60. A similar question exists for the discussion of soil sampling related to Class 2 and 3 impacted areas, as presented in Section 2.3.5 of the LTP and Tables 2-31 and 2-32 (though footnotes associated with Class 3 areas in Table 2-31 indicate that some samples were analyzed for H-3, Fe-55, Ni-63 and Sr-90).

Basis: Per the acceptance criteria/information to be submitted described in NUREG-1 757, Vol.

2, Rev. 1, Section 4.2 (Scoping and Characterization Surveys), licensees should provide:

• A description and justification of the survey measurements for impacted media (for example, building surfaces, building volumetric, surface soils, subsurface soils, surface water, ground water, sediments, etc., as appropriate),

• The justification for considering areas to be non-impacted,

• A discussion of why the licensee considers the characterization survey to be adequate to demonstrate that it is unlikely that significant quantities of residual radioactivity have gone undetected.

Path Forward:

a. Describe the basis for only analyzing for hard-to-detect radionuclides when an elevated direct measurement was encountered during characterization.

b. Describe the analytical measurements that were performed to ensure potential plant derived radionuclides other than Cs-13 7 and Co-60 would be positively identified in both non-impacted and impacted areas.

ZionSolutions, LLC ZS-2016-0014: Enclosure 1 Page 14 of 14 ZSRP Response (3a and 3b) - For the characterization of surface and subsurface soils at Zion, 402 combined surface soil samples and ISOCS measurements were taken in survey units designated as non-impacted. Of the 402 measurement/samples taken, Cs-137 was positively detected through gamma spectroscopy in 181 samples with a maximum observed concentration of 5.70E-01 pCi/g. No other plant-derived gamma-emitting radionuclides (i.e. Co-60) were detected at concentrations greater than the instrument MDC in any of these samples. For the characterization of surface and subsurface soils in impacted Class 3 survey units, 764 combined surface soil samples and ISOCS measurements were taken and 380 subsurface soil samples were taken. Of the 1,144 measurement/samples taken in Class 3 areas, Cs-137 was positively detected through gamma spectroscopy in 182 samples with a maximum observed concentration of 1.1 4E-00 pCi/g. Co-60 was positively identified in one sample at a concentration of 1.25E-01 pCi/g.

For the characterization of surface and subsurface soils in impacted Class 2 survey units, 59 surface soil samples were taken and 60 subsurface soil samples were taken. Of the 119 samples of soil taken in Class 2 areas, Cs-i137 was positively detected through gamma spectroscopy in 15 samples with a maximum observed concentration of 2.10E-01 pCi/g. No other plant-derived gamma-emitting radionuclides (i.e. Co-60) were detected at concentrations greater than the instrument MDC in any of these samples. For the characterization of surface and subsurface soils in impacted Class 1 survey units, 111 surface soil samples and 283 subsurface soil samples were taken. Of the 394 samples of soil taken in Class 1 areas, Cs-137 was positively detected through gamma spectroscopy in 65 samples with a maximum observed concentration of 3.39E+00 pCi/g. Co-60 was detected in 14 surface soil samples and one subsurface soil sample with a maximum observed concentration of 1.04E+00 pCi/g. No other plant-derived gamma emitting radionuclide was identified by gamma spectroscopy in these samples. The 9 surface soil samples and one subsurface soil sample taken in the Class 1 survey units that were showing the highest concentrations of Cs-137 were sent to Eberline Laboratory for full HTD analysis.

The results are presented in Table 2-34 of LTP Chapter 2. No plant-derived radionuclides, including HTD radionuclides, other than Co-60 and Cs-137, were detected by this analysis.

ZSRP contends that there is no reasonable or plausible scenario at Zion where a HTD ROC would be present without the presence of a plant-derived gamma emitting ROC.

c. Provide a justification for considering areas to be non-impacted, when it appears that HTD radionuclides may not have been considered in those areas.

ZSRP Response (3c) - No measurement or sample analysis fi'om characterization samples taken in non-impacted areas positively identified plant-derived radionuclides or Cs-137 at concentrations that exceeded what is considered background for Cs-137 at Zion. The value for Cs-137 ranged fr'om non-detectable to a maximum reading of 5.70E-01 pCi/g over 236 ISOCS measurements and 166 surface soil samples. The mean Cs-137 level detected over this sample population was 2.10E-01 pCi/g with no other plant derived radionuclides positively detected.

This provides a high degree of confidence that the non-impacted survey units are classified correctly. As previously stated, ZSRP contends that there is no reasonable or plausible scenario at Zion where a HTD ROC would be present without the presence of a plant-derived gamma emitting ROC. Consequently, ZSRP does not believe that it is technically justified or necessary to analyze samples from non-impacted areas for HTD radionuclides when no detectable plant-derived gamma emitting ROC were identified above background levels.

ZionSolutions, LLC ZS-2016-0014: Enclosure 2 Reference Documentation LTP Reference 2-21, "Determination of Radionuclide Activity Concentrations in Soils in Non-Impacted Soils Adjacent to the Zion Nuclear Station"

• LTP Reference 2-22, TSD-13-004, "Examination of C s-137 Global Fallout in Soils at Zion Station"

DETERMINATION OF RADIONUCLIDE ACTIVITY CONCENTRATIONS IN SOILS IN NON-IMPACTED SOILS ADJACENT TO THE ZION NUCLEAR STATION July 20122 Prepared By; Reviewed By; Doug Sclhult, Clip Radiological Engineer Bob Decker LTP Radiological Engineering Manager ZionSolutions, LLC Date; Date; 4*4Ž Date; 7~1 Approved By; ZionSolutions, LIC

TABLE OF CONTENETS 1.0 Introduction Page -i 2.0 Survey Design Page -3 3.0 Sample Analyses Page - 5 4.0 Minimum Detectable Activities Page -S 5.0 Survey Results Page-S5 5.1 Surface Soil Samples 5.2 Subsurface Soil Samples 5.3 Ludlum Model 44-10 Detector Measurement Results 6.0 Predicted Cs-137 Activity Concentration in Surface Soils Page - 8 Uist of Attachments;

• - Sampling Location GPS Coordinates

• e Attachment 2 - Ludlum Model 44-10 Detector 1 Minute Readings Collected at Various Heights

• -Surface Soil Sample Results

• • Attachment 4-Subsurface Soil Sample Results

1.0 INTRODUCTION

In support of the decommissioning of the Zion Nuclear Station in Zion, Illinois a survey was performed to determine the radionuclide activity concentration of key radionuclides in non impacted soils adjacent to the Zion Nuclear Station. The area chosen for the survey was the Zion City Park District's Hosah Park, located north of the Zion Nuclear Station, at the end of Shiloh Blvd. The park consists of open land areas with a small shelter and several asphalt walking trails.

There is evidence of several old foundations present. The land area is covered with native grasses and low lying brush. For the most part the open land area appears not to have been disturbed for a number of years. Figure 1 shows the location of the area chosen for survey relative to the location of the Zion Nuclear Station.

In November of 2011 an open land area adjacent to the southern boundary of Hosah Park was surveyed to confirm that the soils in this area could be free released. An area measuring approximately 600 feet by 275 feet, covering an area of approximately 165,000 ft2 (15,300 in2) was surveyed in accordance with Zion Nuclear Station's MARSAME Program. See MARSAME survey package U0-EXT-VCC-592-001. The intent of the survey was to allow soils that may be excavated during constructions activities associated with the Vertical Cask Construction (VCC) area to be moved and/or free released from the site without further radiological concerns. The survey consisted of gamma scans and systematic surface and subsurface soil sampling at 30 sampling locations. The gamma scans failed to identify any areas of elevated activity. The combined data sets, consisting of 60 soil sample analysis results had a mean Cs-137 activity concentration of 1.50E-2 pCifg and a maximum Cs-137 activity concentration of 1.28E-1 pCi/g.

The mean Cs-137 activity concentration for the 30 surface soil samples was 1.14E-2 pCi/g. The sample analysis results were considered to be consistent with expected Cs-137 activity concentrations in disturbed soils due to global fallout and not due to licensed activities associated with the Zion Nuclear Station. This MARSAME survey provided assurance that the open land areas in Hosah Park were not impacted by licensed activities associated with the Zion Nuclear Station.

The survey in Hosah Park was designed to determine the radionuclide activity concentrations of key radionuclides, both naturally occurring and manmade, in surface and subsurface soil. Of particular interest is the activity concentration of Cs-137 in soil due to global fallout since Cs-137 is also one of the more predominant, and easily identified, radionuclides associated with licensed activities at the Zion Nuclear Station. The results of this survey will be used in the future evaluation of soils associated with the Zion Nuclear Station to help ensure that soils impacted by site operations are identified.

Page 1 of 10

Figure 1 Survey Area Relative to Zion Nuclear Station N 4U 48 3?

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Page 2 of 10

2.0 Survey Design The survey design included surface and subsurface soil samples as well as static gamma measurements using a Ludlum 44-10 sodium iodide detector at several distances above the surface of the ground. The survey was designed to; Determine the mean activity concentration and related statistical parameters of key radionuclides in surface soils (0 -15 cm) that have not been impacted by Zion Nuclear Station operations.

Determine the mean activity concentration and related statistical parameters of key radionuclides in subsurface soils (30 - 60 cm) that have not been Impacted by Zion Nuclear Station operations.

Determine the mean response and related statistical parameters of a Ludlum Model 44-10 detector at various distances above soils that have not been impacted by site operations.

Prior to the survey, thirty (30) soil sampling locations were identified in Hosah Park. The sampling locations were chosen in areas that appeared to be undisturbed with minimal vegetation. Each sampling location was flagged and labeled with a sequential number beginning with 001. A GPS device was used to record the GPS coordinates of each of the sampling locations. Attachment 1 contains a listing of the GPS coordinates for each of the sampling locations.

Prior to sampling, all vegetation was cleared from an area of approximately 2 ft2 surrounding each sample location. Once the vegetation was cleared, a one minute count using a Ludlum Model 44-10 detector was collected in contact with the ground and at a height of 15 cm above the ground's surface at each of the sampling locations. Attachment 2 contains a listing of the measurement results collected at each of the sampling locations.

At each sampling location a surface (0 -15 cm) and a subsurface (30 -60 cm) soil sample was collected. As they were collected each soil sample was screened in the field to remove debris, vegetation, and rocks greater than 1 cm in diameter. Each sample was then'placed in a pre labeled sample container and chain of custody paperwork initiated in anticipation of sending the samples to an offsite laboratory for analysis. The surface and subsurface samples collected from two of the sampling locations (01, and 16) were split and submitted to the offsite laboratory as separate samples. A total of 64 samples were submitted to the offsite laboratory for analysis.

Page 3 of 10

Sample containers were pre labeled with a 17 digit alpha numeric sample number. The following example is the sample number for a surface soil sample collected at sample location 001; L4BKGOIBJGSSAOOt iThe first digit "L" designates that the sample came from an open land area.

The second digit "4" designates that the sample came from a non-impacted area.

The third, fourth, and fifth digits indicates the survey area, "BKG" was chosen to designate a survey area for conducting a background study.

The sixth and seventh digit indicates the survey unit, "01" was chosen to represent Hosah Park.

The eighth digit "B' designates that the sample as a background sample.

The ninth digit designates whether the sample Is a biased (judgmental) sample "J" or if the sample is a QC sample "Q".

The tenth digit "G" designates that the sample was from the ground.

• The eleventh digit "S" designates that the sample is a soil sample.

The twelfth and thirteenth digits designate whether the sample is a surface "SS" or a subsurface "BS" soil sample.

The fourteenth digit "A" allows for the survey unit to be subdivided if necessary The fifteenth, sixteenth, and seventeenth digits "001" designate which sample location the sample was obtained from.

At the completion of sampling each sample location was backfilled. Once the GPS data for each of the sampling locations was validated, the flags marking the sample locations were removed.

Page 4 of 10

3.0 Sample Analyses Each soil sample was shipped to Teledyne Brown in Knoxville, Tennessee for analysis. Prior to analysis each soil sample was dried and homogenized. Each soil sample was analyzed for gamma emitting nuclides by gamma spectroscopy (Co-60 and Cs-137), Sr-90, tharium isotopic (Th-228, Th-230, and Th-232), and uranium isotopic (U-234, U-235, and U-238).

Teledyne Brown performed a receipt inspection for each of the samples received and validated that; The sample containers were received in good condition, A chain of custody form was received with each sample, All of the samples listed on the chain of custody were received,

• .* Each sample container contained a label, and The information on the labels matched the information on the chain of custody form.

Four batches of samples were sent to Teledyne Brown using four separate chain of custody forms. For each batch of samples received for analysis Teledyne Brown analyzed a method blank, a laboratory corntrol sample, and performed a duplicate analysis on an arbitrary sample.

4.0 Minimum Detectable Activity The minimum detectable activity specified for the four required analyses; gamma spectroscopy (Co-SO, Cs-137), Sr-90, thorium isotopic (Th-228, Th-230, and Th-232), and uranium isotopic (U-234, U-235, and U-238) was less than 0.1 pCi/g. In all cases the offsite laboratory was able to achieve this MDA, except in those cases where the radionuclide specific activity concentration in the sample exceeded the MDA.

5.0 Survey Results The sample analysis results for select radionuclides are provided in Attachment 3 for the surface soil samples and in Attachment 4 for the subsurface soil samples. Analysis results associated with the gamma spectroscopy analyses for K-40, Co-60, and Cs-137 are included. While other radionuclides were identified by gamma spectroscopy, none of these other radionuclides could be attributed to licensed activities. The radionuclides identified by the gamma spectroscopy analyses not listed in Attachments 3 and Attachments 4 are primarily due to decay products associated with the naturally occurring thorium and uranium decay chains.

Page 5 of 10

5.1 Surface Soil Samples Table 5-1 provides a summary of the surface soil sample results; Table 5-1 Surface Soil Samples_________

Mean Activty 1 Maximum Activity Standard Radian ucl ide Co ncentration Concentration Deviation (pCi/g) pCi/g)

(pCi/g)

K-40 6.96E+0 8.95E+0 9.01E-1 Co-60

-3.19 E-2 2.87 E-2 1.88E-1 Sr-90

-6.03 E-4 5.26 E-2 2.41 E-2 Cs-137 2.11E-1 6.51E-1 1.48E-1 Th-228 1.72E-1 4.30E-1 1.18E-1 Th-230 3.45E-1 2.07E+O 3.55E-1 Th-232 1.53E-1 5.11E-1 1.04E-1 U-234 2.03E-1 1.74E+0 3.23E-1.

U-235 1.40E-2 1

1.37E-1 3.24E-2 U-238 2.11E-1 j

1.86E+O 3.24E-1 With the exception of the naturally occurring radionuclides, the only other radionuclide identified in the surface soil samples was Cs-137. Although Cs-137 is a licensed radionuclide associated with operation/decommissioning of the Zion Nuclear Station it is assumed that the Cs-137 activity concentrations in surface soils summarized in Table 5-1 are due to radioactive fallout.

Page 6 of 10

5.2 Subsurface Soil Samples Table 5-2 provides a summary of the subsurface soil sample results; Table 5-2 Subsurface Soil Samples_________

Mean Activity Maximum Activity Standard Radionuclide Concentration Concentration Deviation (pCi/g)

(pCi/g)

(pCi/g)

K-40 6.62E+0 8.59E+0 9.49E-1.

Co-60 3.72E-4 3.79E-2 1.38E-2 Sr-90 4.40E-3 5.30E-2.

2.16E-2 Cs-137 2.64E-2 2.41E-1 6.00E-2 Th-228 1.26E-1 4.50E-1 1.14E-1 Th-230 3.28E-1 8.11E-1 2.09E-1 Th-232 1.21E-1.

4.05E-1 9.54E-2 U-234 1.25E-1 7.36E-1 1.57E-1 U-235 1.05E-2 1.10E-1 2.43E-2 U-238 1.31E-01 6.65E-1 1.47E-1 As with the surface soil samples, the only other radionuclide, with the exception of the naturally occurring rad~ionuclides, identified in the subsurface soil samples was Cs-137.

However, Cs-137 was only detected in 5 out of 30 subsurface soil samples as compared to 26 out of 30 of the surface soil samples. For the purpose of this report a radionuclide is considered detected when its radionuclide specific activity concentration exceeds both the MDA for the analysis and the 2 o error term associated with the analysis.

Page 7 of 10

5.3 Ludlum Model 44-10 Detector Measurement Result Table 5-3 provides a summary of the, 1 minute, Ludlum Model 44-10 detector measurements at various distances above the ground; Table 5-3 Ludlum 44-10 Detector Measurements Distance Mean Maximum Standard Above (cpm)

(cpm)

Deviation Ground (cpm)

(cm)

Contact 4,464 4,759 129 15 4,432

.4,733 137 The Ludlum Model 44-10 detector measurement results summarized in Table 5-3 show no difference between the contact measurements and the measurements taken at a height of 15 cm. The results also show no indication of elevated activity at any of the measurement locations.

6.0 Predicted Cs-137 Activity Concentration in Surface Soils A review of the Cs-137 sample analysis results for surface and subsurface soil samples summarized in Tables 5-1 and 5-2 show a clear difference in the results. Clearly the sample results can be attributed to two distinct populations. It is postulated that some portions of the open land areas comprising Hosah Park that were sampled during this survey were in fact disturbed areas, allowing surface and subsurface soils to mix. In order to determine the mean activity concentration of Cs-137 in surface soil that have not been impacted by Zion Station operations the surface soil sample analysis results for Cs-137 provided in Attachment 3 have been further analyzed. Of the 32 sample analysis results seven have been eliminated since Cs-137 was not detected in these samples. The analysis results for the remaining 25 samples is provided in Table 6-1 Page 8 of 10

Table 6-1

__________________Cs-137 Activity Concentrations in Surface Soil Sample Number Act~vty (pCi/g) 2 o error (pCi/g)

MDA (pCi/g)

L4BKG01BJGSSSAO2 1.37E-1 5.77E-2 5.29E-2 L4BKGOIBJGSSSAO3 8.32E-2 5.2.6E-2 5.94E-2 L4BKG01BJGSSSAO4 1.23E-1 6.75E-2 5.01E-2 L4BKG01BJGSSSA05 1.72E-15.7-4.E-L4BKG01BJGSSSA06 4.97E-18.4-55E2 L4BKG01BJGSSSA07 3.34E-192125.7-L4BKG01BJGSSSA09 2.66E-15.E-44E2 L4BKG01BJGSSSA10 1.94E-15.E254E-L4BKG01BJGSSSA11 1.51E-14.E-43E2 L4BKGO1BJGSSSA12 3.12E-16.9-5,9-L4B KGO1 BJ GSSSA13 3.17 E-169E-4,E-L4BKGO1BJGSSSA15 2.80E-1 7.38E-2 5,17E-2 L4BKG01BJGSSSA16 2.18E-1 5.72E-2 5.O0E-2 L4BKG01 BJGSSSA17 2.5S2E-1 6.53 E-2 6,11 E-2 L4BKGO1BJGSSSA19 8,06E-2 5.21E-2 4,87E-2 L4BKGO1BJGSSSA20 4.02E-1 6.32E-2 4.71E-2 L4BIKGD1BJGSSSA21 6.51E-1 8.77 E-2 5.85E-2 L4BKG01BJGSSSA22 2,53E-1 6.56E-2 5,56E-2 L4BKGO1BUGSSSA23 2.25E-1 7.19E-2 5.97E-2 L4BKG01BJGSSSA25 2.89E-1 6.11E-2 4.76 E-2 L4BKGO1BJGSSSA2G 2.01E-1 5.81E-2 4.79E-2 L4BKGO1BJGSSSA27 2.27E-1 j

6.92E-2 4.40E-2 L4BKGO1BJGSSSA2B 2.41E-1 6.45E-2 5.O1E-2 J

L4BKG01BJGSSSA29 2,77E-1 7.17E-2 4.90E-2 L4BKG01BJGsSsA30 2.60E-1 6.15E-2 4.13E-2 Number 25 Mean 0.26

• Maximum 0.65 Standard Deviation 0:13 UCLmean 0.31 Page 9 Of 10

Based on the data presented in the Table 6-I the Upper Confidence Level of the Mean of the Cs-137 activity concentrations in undisturbed surface soil in the vicinity of the Zion Nuclear Station is 3.1E-1 pCi/g. Individual activity concentrations as high as 7.4E-1 (6.51E-1 + 8.77-E-2) pCi/g for Cs-137 in undisturbed surface soil would not be unexpected. These results compare favorable to data contained in an August 2005 Human Health Fact Sheet published by Argonne National Laboratory which stated that "The concentration of cesium-137 is surface soil from fallout ranges from about 0.1 to 1 picocurie (pCi)/g, averaging less than 0.4 pCilg."

Page 10 of 10 Sampling Location GPS Coordinates_______________

Sample Location Number Northing Easting 001 642344.0534722 002 642348.84 343768.87 03 642359.14 343773.78 004 642358.54 343779.18 005 642363.36 343784.70 006 642366.39 343779.80 007 642371.09 343773.91 008 642376.90 343777.31 009 642378.36 343783.08 010 642378.71 343787.07 011 642378.01 343792.20 012 642358.54 343788.74 013 642387.43 343785.62 014 642389.91 343781.38 015 642394.14 343782.44 016 642392.77 343785.67 017 642392.28 343791.59 018 642394.10 343795.93 019 642395.13 343792.08 020 642395.81 343787.90 021 642396.25 343783.63 022 642397.71 343782.46 023 642400.89 343783.64 024 642398.81 343791.63 025 642397.81 343793.86 026 642395.33 343804.09 027 642399.48 343803.90 028 642400.86 343796.20 029 1642401.14 343794.38 030 1642405.53 343797.33 Page '1 of 1 Ludlum Model 44-10 Detector 1 Minute Readings Collected at Various Heights Sample Location Number Contact Reading (counts) 15 cm Reading (counts) 001 4318 4279 002 4272 4334 003 4540 4402 004 4530 4395 005 4373

.4372 006 4384 4403 007 4531 4391 008 4426 4502 009 4759 4733 010 4656 4471 011 4573 4719 012 4502 4422 013 4603 4615 014 4453 4390 015 4466 4458 016 4591 4527 017 4605 4627 018 4473 4487 019 4451 4326 020 4447 4353 02.1 I4598 4596 022 4353 4407 023 4263 4274 024 4297 4330 025 4507 4386 026 4258 4105 027 4294 4236 028 4587 4516 029 4487 4392 030 4337 4500

• Page 1 of: 1 Surface Soil Sample Results

SAMPLE ANALYSIS RESULTS FOR SELECT RADIONUCLIDES - SURFACE SOILS Sample Number K-40 Sr-90 1Co-60 Cs-137 Activity 2 o Error MDA Activity 20o Error MDA Activity 2 o Error MDA.

Activity 2 a Error MDA pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g L4BKGO1BJGSSSAO1 L4BKGO1CUGSSSA01 L4BKGO1BJGSSSA02 L4BKGO1BJGSSSA03 L4BKGO1BJGSSSA04 L4BKGO1BJGSSSA05 L4BKGO1BJGSSSA06 L4BKGOIBJGSSSA07 L4BKGOIBJGSSSA08 L4BKGO1BJGSSSA09 L4BKGOIBJGSSSA1O L4BKGO1BJGSSSAl1 L4BKGO1BJGSSSA12 L4BKGO1BJGSSSA13 L4BKGO1BJGSSSA14 L4BKGO1BJGSSSA15 L4BKGO1BJGSSSA16 L4BKGO1QUGSSSA16 L4BKGOQIUGSSSA17 L4BKGO1QJGSSSA18 L4BKGO1QJGSSSA19 L4BKGO1OJGSSSA2O L4BKGO1QJGSSSA21 6.01E+00 7.26E-01 5.85E+00 1.22E+00 6.06E+00 1.14E+O0 7.20E+0O 1.09E+00 5.65E+0O 1,05E-'00 7.97E+00 9.41E-01 6.03E+00O 1.30E+0O 6.55E+O0 1.15E+00 5.80E+00 1.05E+00 7.47E+0O 1.09E+00 8.59E+00 1.23E+00 8.57E+00 9.90E-01 6.55E+00 9.55E-01 7.98E+00 1.03E+00 6.21E+00 9.90E-01 6.89E+00 1.07E+00 6.00E+O0 9.82E-01 8.55E+O0 9.11E-01 7.18E+0O 9.89E-01 6.63E+00 1.39E+00 7.70E+0O 1.08E+00 6.83E+00O 9.35E-01 7.91E+00 1.03+00 2.77E-01 4.25E-01 5,50E-O1 4.43E-01 5.48 E-01 4.37E-01 4.04E-01 5.80E-01 4.18E-01 5.26E-01 5.0DE-01 3.45E-01 5.17E-O1 3.31E-01 4.18E-01 4.71E-01 3.39E-01 3.08E-01 3.79E-01 5.01E-01 4.03E-01 4.O0E-01 3.92E-01 1.18E-02 7.43E--03

-7.41E-03 8.74E-03

-3.55E-02

-7.32E-03 1.05E-02 1.27E-03

-2.25E-02 1.42E-02

-3.29E-02

-1.65E-02

-3.28E-02

-6.13E-D3 1.10E.-02

-1.21E-04 2.02E-02 3.41E-02

-6.22E-03 2.96E-03

-4.79E-02 1.45E-02 2.55E-02 2.65E-02 3.04E-02 2.69E-02 2.79E-02 2.66E-02 3.30E-02 2.87E-02 2.41E-02 2.64E-02 2.84E-02 2,38E-02 3.02E-02 2.83E-02 3.30E-02 3.21E-02 2.44E-02 2.91E-02 4.78E-02 2.05E-02 2.25E-02*

4.74E..02 5.05E-02 6.1OE-02 5.09E-02 5.94E.-02 5.46E-02 5.41E-02 5.75E-02 6.67E-02 5.56E-02 4.77E-02 5.56E-02 5.44E-02 5.21E-02 6.23 E-02 6.08E-02 6.63E-02 6.20E-02 4.85E-02 4.57E-02 7.49E-02 3.46E-02 3.67E-02 8.14E-02 9.82E-02 9.77E-02

-1.16E-02 1.69E-03

-1.66E-03 2.87E-02

-2,71E-02

-4.08E-03 2.49E-03

-4.17E-03 5.72E-03 5.08E-03 1,41E-02 2.47E-02

-1.15E-02

-5.01E-03

-5.28E-03

-1.09E-02

-1.06E+O0 5.51E-03 2.24E-02

-2.97E-02

-1.22E-02

-1.10E-03 2.87E-02 2,20E--02 3.44E-02 3.06E-02 3.95E-02 4.00E-02 2.78 E-02 4.12E-02 3.96 E-02 3.49E-02 2.48E-02.

3.72E-02 3.28E-02 3.27E-02 3.28 E-02 3.36SE-02 3.64E-02 2.83E-02 2.92E-02 3.12E-02 3.57E-02 2.62E-02 2.87E-02 3.O1E-02 3.34E-02 5,59E-02 4.62E-02 7.34E-02 6.02E-02 4.51E-02 6.74E--02 6.33E-02 5.86E-02 4.19E-02 6.38E-02 6.02E-02 5.09E-02 5.23E-02 5.25E-02 5.55E-02 4.18E-02 4.89E-02 5.79E-02 4.58E-02 3.90E-02 4.77E-02 5.64E-02

-2.61E-03 2.42E-02 3.42E-02 1.37E-O1 5.77E-02 8.32E-O2 5.16E-02 1.23E-G1 6.75E-02 1.72E-01 5.37E-02 4.97E-01 8.54E-02 3,34E-01 9,21E-02 1,22E-02 4.24E-02 2.66E-D1 5.53E-02 1.94E-01 5.57E-02 1.51E-O1 4.74E-02 3,12E-O1 6.09E-02 3.17E-01 6.99E-02 1.05E-02 2,84E-02 2.80E-O1 7.38E-02 2.18E.-01 5.72E-02 7.57E-03 3.O0E-02 2.52E-01 6.53E-02 8.86E-02 4.41E-02 8.06E-02 5.21E-02 4.02E-01 6.32E-02 6.51E-01 8.77E-02 3.97E-02 6,20E-02 5.29E-02 5.94E-02 5.01E-.02 4.01E-02 5.58E-02 5.27E-02 6.22E-02 4.46E-02 5.41E-02 4.39E-02 5.09E-02 4.46E-02 4.42E-02 5.17E-02 5.00E-02 5.05E-02 6.11E-02 9.22E-02 4.B7E-02 4.71E-02 5.85E-02 Page 1 of 6

Sample Number K-40 Activity 2 a Error pCi/g pCi/g MDA pCi/g St-90 Activity 2 oi Error pCi/g pCi/g M DA pCi/g Co-60 Activity 2 oi Error pCi/g pCi/g L4BKG01BJGSSSA22 L4BKGOIBJGSSSA23 L4BKGO1BJGSSSA24 L4BKGO1IBGSSSA25 L4BKGOIBJGSSSA26 L4BKGOIBJGSSSA27 L4BKG01BJGSSSA2.8 L4BKG01BJGSSSA29 L4BKG01BJGSSSA30 6.92E+OO 1.05E+00 4.22E-01.

6.20E+00 9.62E-01 5.43E-01 7.89E+00 7.50E-01 2.23E-C1 7.64E+0O 9.35E-01 3.71E-O1 6.68E+00 1.03E+00 4.02E-01 7.31E+00 9.28E-01 3.42E-O1 7.47E+00 9.46E-01 4.20E--O1 7.05E+00 9.61E-01 4.66E-01 5.44E+00 8.11E-01 4.27E-01 5.26E-02 1.63E-O2

-3.71E-02 1.36E-02

-2.99E-02

-2.06E-02 4.79E-O2

-1.15E-03

-7.83E-O3 5.78E--02 8.88E-02 1.96E-02 3.68E--02 4.64E-02 9.79E-O2 4.12E-02 8.01E-O2 4.31E-02 8.98E-02 4.61E-02 9.44E--02 4.98E-02 9.29E-02 1.52E-02 3.05E-02 2.49E-02 5.06E-02 7.70E-03 3.54E-03

-1.08E-05

-1.47E-02 2,00E-02 7.11E-03 5.69E-O3

-9.79E-O3 4.48E-03 2.98E-O2

2. 22E-02 2.14E-02 2.18E-02 3.08E-02 2.69E-02 3.04E-02 2.18E-02 2.78E-O2 MDA pCi/g 5.12E-O2 4.74E-02 3.53E-02 2.91E-02 5.65E-02 4.55E-02 5.13E-02 3.95E-02 5.54E-02 Cs-1.37 Activity 2 a Error pCi/g pCi/g 2.53E.-1 6.56E-02 2.25E-01 7.19E-02

-7.93E-03 2.11E-02 2.89E-01 6.11E-02 2,01E-01 5.81E-02 2.27E-O1 6.92E-02 2.41E-01 6.45E-O2 2.77E-01 7.17 E-02 2.60E-O1 6.15E-02 M DA pCi/g 5.56E-02 5.97E-02 3.35E-02 4.76E-02 4.79E-02 4.40E-02 5.0 1E-02 4.90E.-02 4.13 E-02 6.96E+00 MEAN 8.59E400 MAX 9.01E-01 STDEV

-6.03E-04 5.26E-02 2.41E-02 MEAN MAX STDEV

-3.19E-02 2.87E-02 1.88E-01 MEAN MAX STDEV 2.11E-01 MEAN 6.51E-01 MAX 1.48E-O1 STDEV Page 2 of 6

SAMPLE ANALYSIS RESULTS FOR THORIUM - SURFACE SOILS Sample Number L4BKGO1BJGSSSA01 L4BKG01QJGSSSA01 L4BKGO1BJGSSSA02 L4BKGD1BJGSSSA03 L4BKG01BJGSSSA04 L4BKG01BJGSSSA05 L4BKG01BJGSSSA06 L4BKGO1BJGSSSA07 L4BKGO1B.IGSSSA08 L4BKGOIBJGSSSA09 L4BKGOIBJGSSSA1O L4BKG01BJGSSSA11 L41BKG01BJIGSSSA12 L4BKG01BJGSSSA13 L4BKG01BJGSSSA14 L4BKGO1BJGSSSA15 L4BKG01BJGSSSA16 L4BKGO1QJGSSSA16 L4BKG01BJGSSSA17 L4BKGO1BJGSSSA18 L4BKGO1BJGSSSA19 L4B KGO1BJIGSSSA20 L4BKG01BJGSSSA21 Activity pCi/g 1.90E-O1 1.91E-O1 1.55E-01 1,07E-01 1.46E-01 1.36E-01 2.49E-01 1.59E-02 3.88E-O1 4.94E-02 2.46E-O1 4.30E-01 6.23E-03 2.23E-01 2.99E-01 1.27E-01 3.19E-01 2.53E-01 1.97E-02 3.73E-01 2.44E-01 5.11E-02 1.a6E-01 Th-228 2 o Error pCi/g MDA pCi/g Activity pCi/g Th-230 2 a Error pCi/g 9.06E-02 9.97E-02 8,20E-02 6,62E-02 8,39E-02 9.16E-02 7.58E-02 6.11E-02 7.33E-02 4.93E-02 7.88E-02 7.16E-02 1.03E-01 6.39E-02 6.64E-02 4.71E-02 2.56E-O1 3.07 E-01 4.66E-02 3.61E-02 1.37E-O1 1.39E-01 1.81E-01 9.99E-02 4.6 1E-02 8.02E-02 1.24E-01 1.01E-01 1.62E-01 2.93E-02 7.35E-02 6.68E-02 1.19E-01 1.43E-01 1,45E-01 1.64E-O1 5.51E-02 9.09E-02 1.74E-01 1.88E-01 1,05E-01 9.83E-02 9.04E-02 8.48E-02 1,24E-O1 5.22 E-02 5.94E-01 1,38E-O1 3.52E-01 1.04E-01 5.78E-01 1.41E-01 3.26E-01 1.25E-01 2.68E-O1 9.85E-02 2.15E-O1 9.12E-02 3.50E-01 1.20E-01 4.75E-02 5.60E-02 2.07E+00 5.07E-O1 3.06E-01 1,13E-O1 2.95E-01 1.40E-O1 4,55E-01 1.82E-01 3.54E-01 1.84E-01 3.59 E-O1 1.47E-01 5.23 E-02 7.O1E-02 3.27E-01 1.13E-01 4.58E-01 1.18E-01 4.74E-01 1.70E-01 1.07E-01 7.51E-02 4.14E-01 1.61E-01 6.09E-O1 1.53E-01 2.O0E-02 6.48E-02 3.50E-02 7.03E-02 MDA pCi/g 4.94E-02 3,42E-02 6.05E--02 6.05E-02 3.45E-02 3.17 E-02 1.20 E-02 5.7 1E-02 1.01E-01 7.15E-02 1.08E-01 6.99E-02 7.94E-.02 1.89E-02 5.41E-02 3.62E-02 6.21E-02 9.13E-02 3.40E-02 9.31E-02 7.08E-02 8.39E-02 5.17E-02 Activity pCi/g Th-232 2 a Error pCifg 2.08E-01 8.00E-02 2.18E-01 8.29E-02 1.81E-O1 7.72E-02 8.81E-02 6.25E-02 1.57E-01 7.22E-02 1.52E-01 7.50E-02 1.87E-01 8.54E-02 4.80E-02 4.86E-02 5.11E-01 2.46E-01 1.10E-01 6.76E-02 9.67E-02 8.06E-02 1.71E-01 1.06E-01 2.18E-01 1.41E-O1 1.79E-01 1.04E-01 1.31E-01 1.07E-01 1.27E-01 6.59E-02 2.18E-O1 8.11E-02 2.76E-01 1.27E-01 2.48E-02 3.51E-02 2.12E-01 1.13E-01 2.69E-01 9,88E-02 9.17E402 1.07E-01 0.00E+00 0.00E+00 MDA pCi/g 2,85E-02 4.42E-02 3.02E-02 1.62E-02 1.99E-02 2.24E-02 3.88E-02 1.77E-02 1.43E-01 4.38E-02 6.61E-02 4.04E-02 5.62E-02 5.10E-02 5.41E-02 2.09E-02 4.59E-02 5,27E-02 1.83E-02 5.38E-02 3.34E-02 4.51E-02 5.17 E-02 Page 3 of 6

Sample Number L4BKGO1BJGSSSA22 L4BKGO1BJGSSSA23 L4BKGOIBJGSSSA24 L4BKGOIBJGSSSA25 L4BKGOIBJGSSSA26 L4BKGO1BJGSSSA27 L4BKGO1BJGSSSA28 L4BKGOIBJGSSSA29 L4BKGOIBJGSSSA30 Th-228 Activity 2 o Error pCi/g pCi/g MDA pCi/g 9.55E-02 1.28E-O1 9.88E-02 3.31E-01 1.92E-O1 1.74E-01

-7.29E-03 1.46E-02 5.76E-02 1.70E-01 1.03E-01 9.31E-02

-1.37E-02 4.30E-02 9.68E-02 1.49E-01 7.67E-02 5.28E-02 1.46E-01 7.89E-02 6.82E-02 1.65E-01 8.63E-02 6.68E-02 1.50E-01 8.67E-02 1.30E-O1 Activity pCi/g 0.O0E+00 3.42E-01 2.91E-01 1.38E-01 1.22E-01 2.72E-01.

2.20E-01 2.89E-01 3.00E-01 Th-230 2 o Error pCi/g 0.00E+00 1.78E-01 1.63E-01 8.19E-02 7.17E-02 1.02E-01 9.04E-02 1.09 E-01 8.35E-02 MDA pCi/g 5,25E-02 7.68E-02 3.06E-02 4.61E-02 5.87E-02 3.70E-02 3.02E-02 1.26E-02 3.34E-02 Activity pCi/g O.00E+00 2.70E-01 0.00E+00 1.88E-01

-1*21E-02 1.06E-01 1.68E-01 1.53E-O1 1.59E-01 Th-232 2 G Error pCi/g O.OOE+00 1.55E-01 0.00E+00 9.51E-02 1.21E-02 6.06E-02 7.74E-02 7,85E-02 6.15E-02 MDA pCi/g S.25E-02 5.43E-02 3.06E-02 4.61E-02 4.79E-02 2.14E-02 2.14E-02 4.O5E-02 3.34E-02 1,72E-01 4.30E-01 1.18E-01 MEAN MAX STDEV 3.45E-01 2.07E+00 3.55E-01 MEAN MAX STDEV 1.53E-01 5.11E-01 1.04E-01 MEAN MAX STDEV Page 4 of 6

SAMPLE ANALYSIS RESULTS FOR URANIUM -SURFACE SOILS sample Number L4BKG01BJGSSSA01 L4BKG01QJGSSSA01 L4BKG01BJGSSSAO2 L4BKGO1BJGSSSA03 L4BKG01BJGSSSA04 L4BKG01BJGSSSA05 L4BKG01BJGSSSA06 L4BKG01BJGSSSA07 L4BKGO1BJGSSSA08 L4BKGOIBJGSSSA09 L4BKG01BJGSSSA10 L4BKG01BJGSSSA11 L4BKG01BJGSSSA12 L4BKG01BJGSSSA13 L4BKGOIBJGSSSA14 L4BKGO1BJGSSSA15 L4BKGO1BJGSSSA16 L4BKGOIQJGSSSA16 L4BKGOIBJGSSSA17 L4BKGO1BJGSSSA18 L4BKGO1BJGSSSA19 L4BKGO1BJGSSSA20 IL4BKGO1BJGSSSA21 Activity pci/g 2.88E-O1 6.49E-03

-i.55E-O2 4.99E-02

-1.07E-O2 2.97E-01 1.49E-01 7.5OE-02 1.74E+00 4.37E-01 O.OOE+O0 0.00E+O0 9.16E-02 2.69E-02 0OJOE+OO O.00E+00 2.67E-01 1.75E-01.

2.57E--01 2.13E-01 2.99E-O1 2.51E-01 8.23E-03 U-234 2 a Error pCi/g MDA

.pCi/g 1.72E-01 1.60E-01 4.73E-02 8.25E-02 2.20E-02 8.67E-02 7.81E-02 8.41E-02 2.14E-02 8.44E-02 1.40E-O1 6.44E-02 1.36E-01 4.39 E-O2 7.61E-02 2.77E-O2 6.75E-O1 4.22E-O1 2.65E-01 2.62E-01 2.42E-02 4.39E-02 0.00E+00 4.35E-02 8.25E-02 2.70E-02 4.20E-02 4.53E-02 O.00E+00 5.19E-02 1.53E-02 5.45E-02 1.26E-O1 5.66E-02 9.85E-02 7.83E-02 1.59E-O1 1.80E-01 1.22E-O1 1.37E-01 1.43E-01 1.44E-O1 1.16E-01 1.76E-02 4.19E-02 7.04E-02 Activity pCi/g

-8.32E-03 1.71E-02 2.76E-02 O.OOE+-O0 0.00E+00 l.67E-02 O.OOE+O0 4.64E-02 O.OOE+00O

-1.24E-02 O.00E+O0 0.00E+00

-1.57E-02 1.44E-02 0.00E-I00 l.37E-O1 6.00E-02 1.38E-02 O.OOE÷IO0 1.15E-02 5.10E-02 0.OOE+00 O,00E+O0 U-235 2 a Error pCi/g 1.67 E-02 5,56E-02 5.52 E-02 2.03E-02 2.95E-02 3.36E-02 O.00E+00 6.61E-02 2.78E-O2 2.48E-02 3.00E-02 0.OOE+00 2.23E-02 2.88E-02 O,00E+00 1.60E-O1 6.07E-O2 2.7.6E-02 9.72E--03 3.97E-02 6.25E-02 0.00E+00 M DA pCi/g 6.58E-02 7.21E-02 4.07E-02 3.95E-02 5.60E-02 2.47E-O2 5.43E-02 3.42E-02 9.34E-O2 9.78E-O2 5.43E-02 5.38 E-02 8.80E-O2 2.12E-02 6.42E-02 6.74E-02 2.21E-02 2.03E-02 2.34E-02 5.34E-02 5.94E-02 6.88E-02 Activity pCifg U-238 2 a Error pCi/g 2.77E-01 1.61E-01 6.37E-02 7.39E-02 1,41E-01 1.21E-01 0.00E+O0 O.00E+O0 6.14E-02 8.71E-O2 2,34E-01 1.22E-01 1.49E-01 1.36E-01

-1.95E-02 2.28E-02 1.86E+00 6.85E-01 3.45E-01 2.15E-01 3.56E-O1 2.21E-01 2.95E-02 5.92E-02 7.25E-02 8.52E-02 3.45E-02 4.88E-02 O.00E+0O 0.00E+O0 O.00E+00 1.53E-02 2.18E-01 1.28E-01 2.42E-01 1.14E-01 2.57E-01 1,42E-O1 2.04E-01 1.06E-01 3.51E-01 1.32E-O1 2.39E-01 1.13E-O1 4.59E-02 5.33E-02 M DA pCi/g 1.19E-Q1 3.13E-02 8.67E-02 3,19E-02 4.53E-02 5.26E-02 4.39E-02 8.92E-02 3,15E-O1 1.37E-O1 1.42E-01 4.35E-02 8.72E-02 5.54E-02 5.19E-02 5.45E-02 1.13E-01 7.83E-02 1.34E-01 9.65E-02 8.32E-02 1.76E-02 4.07E-02 1.14E-02 2.36E-02 Page 5 of 6

Sample Number L4BKG01B.JGSSSA22 L4BKGOIBJGSSSA23 L4BKGO1BJGSSSA24 L4BKGO1BJGSSSA25 L4BKGO1BJGSSSA26 L4BKGOIBJGSSSA27 L4BKGO1BJGSSSA28 L4BKGO1BJGSSSA29 L4BKGO1BJGSSSA30 Activity pCi/g U-234 2 a Error pci/g M DA pCi/g 6.34E-01 2.73E-01 1.58E-01 2.67E-01 1.12E-01 7.03E-02 1,48E-02 5.13E-02 6.90E-02 4.37E-01.

1.65E-01 1.04E-01 1.53E-01 6.71E-02 1.96E-02 1.41E-02 4.89E-02 6.57E-02 2.24E-02 7.26E-02 9.41E-02 1.85E-01 8.61E-02 5.80E-02 1.56E-O1 8.21E-02 4.75E-02 Activity pCi/g 9.34E-02 1.09E-03

-1.83E-02 1.59E--02 7.70E-03 O.OOE+0O 0.00E+00 0.00E+00

-9.72E-03 U-235 2 a Error pCi/g 1.08E-01 2.94E-02 3.66E-02 5.50E-02 l.55E-02 1.13E-02 2.72E-02 O.OOE+O0 1.38E-02 MDA pCi/g 4.59E-02 5.50E-02 8.53E-02 7.40 E-O2 1.14E-02 8.13E-02 6.24E--02 1.39 E-02 4.80E-02 Activity pCi/g 4.01 E-01 1.66 E-O1 O.OOE+O0 2.83E-01 1.53E-01 7.05E-02 1.71E-01 1.64F-01 1.77E-01 U-238 2 a Error pCi/g 2.39E-01.

8.74E-02 9.25E-03 1.42E-01 6.71E-02 6.33E-02 1.54E-01 7.64E-02 8.66E-02 MDA pCij/g 2.37E-01 5.45E-02 2.18E-02 1.20E-01 1.96E-02 2.08E-02 5.05E-02 2.37E-02 3.88E-02 2.03E-01 1.74E-i00 3.23E-01 MEAN MAX STDEV 1.40 E-02 1.37E-01 3.24E-02 MEAN MAX STDEV 2.11E-01 1.86E+00 3,.24E-01 MEAN MAX STDEV Page 6 of 6

SAMPLE ANALYSIS RESULTS FOR SELECT RADIONUCLIDES - SUB SURFACE SOILS Sample Number L4BKG01BJGSBSA01 L4BKGO1QJGSBSAO1 L4BKG01BJGSBSA02 L4BKG01BJGSBSAO3 L4BKG01BJGSBSA04 L4BKG01BJGSBSAO5 L4BKGO1BJGSBSA06 L4BKGO1BJGSBSAO7 L4BKG01BJGSBSA08 L4BKGO1BJGSBSAO9 L4BKG01BJGSBSA10 L4BKG01BJGSBSA11 L4BKGO1BJGSBSA12 L4BKG01BJGSBSA13

• L4BK(GOIBJGSBSA14 L4BKGOIBJGSBSA15 L4BKG01BJGSBSA16 L4BKGOIQJGSBSA16 L4BKGO1BJGSBSA17 L4BKGOIBJGSBSA18 L4BKGO1BJGSBSA19 L4BKG01BJGSBSA2O L4BKG01BJGSBSA21 I.

K-40 Activity 2aoError pCi/g pCi/g 6.30E+00 9.26E-01 6.80E+0O 9.S5E1-O1 6.82E+i0O 8.35E-01 6.41E+00 9.13E-01 5.75E+I00 8.92 E-01 5.79E+00 1.05E+00 4.48E+00 8.07 E-01 5.56E+00 8.92E-01 6,41E+00 1.20E+00 6.09E+O0 8.19E-01 5.17E+00 8.84E-01 8.04E+OO 1.08E+00 7.12E+O0 1.03E+00 6.23E+O0 1.O8E-i00 6.90E+OO 7.14E-01 6.92E+O0 9.77E-01 6.16E+0O 8.69E-O1 6.45 E+0O 8.32E-O1 7.13E+0O 8.63E-01 8.59E+00 8.72E-01 5,34E+O0 9.04E-O1 6.75E+00 1.02E+OO 7.24E+00 9.34E-01 MDA pCi/g 2.47E-O1 3.86E-01 4.03E-01 2.80E-01 4.21E-01 4.90E+00 3.03E-O1 4.22E-01 5.33E-01 2.65E-01 3.16E-01 3.45E-O1 1.46E-O1 4.57E-O1 1.45E-O1 3.60E-01 2.58E-O1 3.85E-01 2.80E-O1 3.14E-O1 3.86E-O1 2.03E-O1 3.06E-O1 Sr-90 Activity 2 o Error MDA pCi/g pCi/g pCi/g 4.99E-03 2.70E-02 5.30E-02 2.21E-02 3.41E-02 6.48E-02 1.67E-02 2.94E-02 5.61E-02

-2.3 1E-02 2.59E-02 5.48E-02

-1.35E-02 2.84E-02 5.83E-02

-2.68E-02 2.78E-02 5.90E-02 2.50E-03 3.24E-02 6.42E-02

-1.10E-03 2.46E-02 4.90E-02 9.76E-03 2.76E-02 5.35E-02

-5.47E-03 2.59E-02 5.23E-02

-5.13E-03 3.37E-02 6.77E-02

-2.42E-04 2.77E-02 5.51E-02 9,04E-03 3.02E-02 5.88E-02

-2.03E-02 2.17E-02 4.63E-02 2.59E-04 2.54E-02 5.03E-02

-1.39E-03 2.36E-02 4.71E-02

-1.3DOE-02 4.77E-02 7.95E-02

-4.08E-02 4.96E-02 8.45E-02 1.97E-02 2.26E-02 3.46E-02 4.96E-02 5.45E-02 8.42E-02 5.30E-02 6.31E-02 9.76E-02 7,97E-03 5.47E-02 8.91E-02

-2.1BE-02 5.30E-02 9.03E-02 Activity pCi/g Co-60 2 a Error pCi/g 1.92E-02 2.88E-02

-9.67E-03 2.79E-02

-1.34E-02 2.89E-02

-8.91E-03 2.99E-02 6.79E-03 2.48E-02

-1.59E-02 3.19E-02

-1.26E-02 3.06E-02

-4.69E-03 2.77E-02

-1.08E-02 3.70E-02

-9.42E-04 2.18E-02 3.22E-03 2.91E-02 1.25E-02 3.53E-02 9.58E-05 3.10E-02

-2.54E-02 3.74E-02 1.18E-02 2.03E-02

-3.15E-04 2.60E-02 1.7OE-02 2.63E-02

-3.89E-03 2.29E-02 3.98E-03 2.14E-02 2.89E-03 1.82 E-02 3.79E-D2 2.97E-02

-8,81E-03 3.20E-02

-2.43E-02 2.59E-02 M DA pCi/g 5,,24E-02 4.44E-02 4.43E-02 4.67E-02 4,22E-02 4,61E-02 4.81E-02 4.44E-02 5.87E-O2 3.61E-02 4.83E-02 6.09E-02 5.21E-O2 5.57E-02 3.64E-02 4.20 E-O2 4.87E-02 3.62E-02 3.71E-02 3.09E-02 5.93E-02 5.03E-02 3,42E-02 Cs-137 Activity 2 a Error pCi/g pCi/g 1.98E-02 2.19E-02 1.59E-02

-1.20E-02 1.94E-02

-6.27E-03 4.61E-03 5.09E-03

-6.13E-03

-3.70E-03

-2.22E-02 1.1OE-02 1.32E-02 1.13E-02 9.30E-03

-2.27 E-03 1.05E-01

-6.13E-03 4.03E-02

-6.63E-03 5.66E-03

-4.67E-03 1.26E-03 2.95E-02 2.56E-02 2.87E-02 2.88E-02 2.66E-02 3.07E-02 3.00E-02 2.57E-02 4.11E-02 2.17E-02 2.69E-02 3.14E-02 3.07E-02 3.51E-02 2.26E-02 2.50E-02 4.10E-02 2.52E-02 3.86E-02 2.07E-02 2.80E-02 3.38E-02 2.65E-02 MDA pCi/g 5.29E-02 4.66E-02 5.O0E-02 4.46E-02 4.84E-02 5.02E-02 5.09E-02 4.33E-02 6.52E-02 3.52E-02 3.91E-02 5.48 E-02 5.27E-02 5.91E-02 3.89E-02 4.11E-02 4.46E-02 3.98 E-02 3.73E-02 3.30E-02 4.77E-02 5.46E-02 4.31E-02 Page 1 of 6

Sample Number L4BKGOIBJGSBSA22 L4BKGOIBJGSBSA23 L4BKGO1BJGSBSA24 L4BKGO1BJGSBSA25 L4BKG01BJGSBSA26 L4BKG01BJGSBSA27 L4BKG01BJGSBSA28 L4BKG01BJGSBSA29 L4BKG01BJGSBSA30 K-40 Activity 2 o Error MDA pCi/g pCi/g pCi/g 7,73E+00 1.002+00 2.92E-01 5.44E+00 1.11E+00 3.192-01 8.28E+00 9.91E-01 2.69E-01 7.82E+00 7.84E-01 2.86E-01 7.29E+00 7.71E-01 2.51E-01 5.96E+00 8.142-01 1.19E-01 7.47E+O0 9.46E-01 4.20E-01 7.33E+00 1.17E+00 2.78E+00 6.17E+00 1.39E+00 5.37E-01 Activity pCi/g

-7.22E-04 1.23E-02 3.88E-02

-3.25E-03 2.49E-03 1.04E-02 4.79E-02 9.44E-03 3.43E-04 Sr-90 2 o Error pCi/g 1.84E-02 1.32E-02 2.58E-02 1.50E-02 1.52E-02 2.84E-02 4.98E-02 1.26E-02 1.23E-02 MDA pa/lg 3.05E-02 2.45E-02 4.59E-02 3.02E-02 2.99E-02 5.50E-02 9.29E-02 2.37E-02 2.44E-02 Co-60 Activity 2 a Error pCi/g pCi/g M DA pCi/g

-7.792-03 2.78E-O2 4.34E-02 1.44E-02 2.51E-02 5.01E-02

-5.58E-03 2.92E-02 4.71E-02

-1.262-02 2.00E-O2 3.06E-02 3.57E-03 2.03E-02 3.47E-02 1.97E-03 2.48E-02 4,06E-02 5.69E-03 3.04E-02 5.13E-02 1.60E-02 2.62E-02 5.03E-02 2.05E-02 2.81E-02 5,52E-02 Cs-137 Activity 2 o Error pCi/g pCifg 4.81E-03 3.36E-02 2.14E-01 6.89E-02 1.62E-02 2.87E-02 1.17E-03 2.25E-02

-1.54E-02 2.29E-02 1.07E-01 4.10E-02 2.41E-01 6.45E-02 4.50E-02 3.59E-02 1.61E-02 3.33E-02 M DA pCi/g 5.53E-02 4.78E-02 5,08E-02 3,67E-02 3.52E-02 4,65E-02 5.O1E-02 6.81E-02 5.74E-02, I ______________________________

L 6.622+00 MEAN 8.59E+OO0 MAX 9.49E-01 STDEV 4.40E-03 5.30E-02 2.16E-02 MEAN MAX STDEV 3.72E-04 MEAN 3.79E-02 MAX 1.38E-02 STDEV 2,64E-02 2.41E-01 6.00E-02 MEAN MAX STDEV Page 2 of 6

SAMPLE ANALYSIS RESULTS FOR THORIUM - SUB SURFACE SOILS Sample Number L4BKG01BJGSBSA01 L4BKG01QJGSBSA01 L4BKG01BJGSBSA02 L4BKG01BJGSBSA03 L4BKG01BJGSBSA04 L4BKGO1BJGSBSAO5 L4BKGOIBJGSBSA06 L4BKGOIBJGSBSA07 L4BKGO1BJGSBSA08 L4BKGO1BJGSBSA09 L4BKGOIBJGSBSAIO L4BKGOIBJGSBSA11 L4BKGOIBJGSBSA12 L4.BKGOIBJGSBSA13 L4BKGOIBJGSBSA14 L4BKGO1BJGSBSA15 L4BKGOIBJGSBSA16 L4BKGO1QJGSBSA16 L4BKGO1BJGSBSA17 L4BKGOIBJGSBSA18 L4BKGOIBJGSBSA19 L4BKGOIBJGSBSA20 L4BKGOIBJGSBSA21 Th-228 Activity 2 a Error pCi/g pCi/g MDA pCi/g 5.79E-02 8.20E-02 4.26E-02 1.99E-02 5.99E-02 9.66E-02 4.19E-02 4.63E-02 4.98E-02 3.30E-02 4.40E-02 3.42E-02 1.51E-O1 7.25E-02 4.35E-02 1.56E-O1 8.27E-02 6.79E-02 8.85E-02 9,03E-02 8.48E-02 3.38E-O1 1.88E-O1 1.79E-01 3.86E-02 5.50E-02 2.84E-02 3.43E-02 6.08E-02 5.69E-02 2.64E-01 1.50E-01 1,37E-01 3.03E-01 1.80E-01 1.30E-01 4.50E-01 2.42E-O1 1.96E-01 1.45E-01 1.01E-01 6.90E-02 6.07E-02 8,65E-02 4.47E-02 3.64E-01 1.41E-01 8.03E-02 7.17E-02 7.99E-02 5.38E-02 1.78E-01 1.11E-O1 1.14E-01 2.25E-01 1.28E-01 1.41E-01 7.18E-02 8.96E-02 8.43E-02 2.95E-02 5,47E-02 8.45E-02 2.02E-O1 1.17E-01 7.58E-02 3.17E-02 7.30E-02 9.43E-02 Activity pci/g 6.74E-01 7.79 E-02 4.51E-01 2.83E-01 2.64E-01 3.34E-01 2.40E-O1 3.69E-01 5.34E-01 6.29E-01 3.98E-01 8.11E-01 3.99E-01 3,68E-01 5.60E-01 7.80E-01 5.15E-02 2.39E-01 5.07E-01 9.99E-02 3.74E-01 2.68E-01 7.35E-03 Th-230 2 o Error pCi/g 3.04E-O1 7.08E-02 1.27E-01 1.20E-01 9.53E-02 1.19E-01 1.40E-O1 1.78E-O1 2.20E-01 2.52E-01 1.72E-O1 2.95E-O1 2.20E-01 1.62E-01 2.80E-01 2.18E-01 6.87E-02 1.16E-01 1.66E-01 9.76E-02 1.32E-01 1,30E-O1 5.36E-02 M DA pCi/g 2.08 E-01 2.30E-02 5.5 1E-02 1t83E-02 1.93E-02 5.49E-02 9.70E-02 9.26E-02 2.81E-02 5.64E-02 1.01E-01 5.76E-02 1.59E-01 7.89E-02 8.25E-02 6.28E-02 5.33E-02 7.61E-02 7.54E-02 5.90E-02 8.36E-02 3.75E-02 9.34E-02 Activity pCi/g 1.62E-01 4.67E-02 1.32E-O1 4.50E-02 1.31lE-Ol 1.79E-01 4.6BE-02 2.39 E-01 3.81E-02 4.10E-02 4.05E-01 2.24E-01 i.42E-O1 1.91E-O1 1.40E-01 3.38E-O1 1.94E-02 2.02E-O1 1.92E-01 4.30E-02 7.77E-02 2.14E-01 0.OOE+O0 Th-232 2 a Error pCi/g 1.43E-01 6.45E-02 7.02E-02 5.01E-02 6.44E-02 8.12E-02 6.25E-02 1.50E-01 5.43E-02 5.85E-02 1.67E-O1 1.45E-01 1.18E-01 1.13E-O1 1.38E-O1 1.29E-O1 3.88E-02 1.04E-01 1.04E-01 6.09E-02 5.80E-02 1.15E-O1 0.00E+00 MDA pCi/g 7.86E-02 2.30OE-02 2.47 E-02 3.38E-02 1.93E-02 1.20E-02 4.85E-02 1.20E-01 2.81E-02 3.03E-02 4.5 1E-02 5.76 E-02 3.48E-02 5.58E-02 8.25E-02 1.51E-02 2.86E-02 4.82E-02 6.75E-02 3.17E-02 2.79E-02 3.75E-02 3.55E-02 Page 3 of 6

Sample Number L4BKGO1BJGSBSA22 L4BKGOIBJGSBSA23 L4BKGO1BJGSBSA24 L4BKGO1BJGSBSA25 L4BKGO1BJGSBSA26 L4BKGO1BJGSBSA27 L4BKGO1BJGSBSA28 L4BKGO1BJGSBSA29 L4BKGO1BJGSBSA30 Activity pCi/g 9.22E-02 4.52E-02 2.39E-02 5.52E-02 6.53E-02 1.49E-O1 4.75 E-03 8.11E-02 1.56E-01 Th-228 2 a Error pCi/g 9.35E-02 5.47E-02 4.80E-02 7.80E-02 7.08E-02 7.76E-02 3.27E-02 6.37E-02 7.73E-02 MDA pCifg 3.40E-02 5.95E-02 3.52E-02 8.86E-02 9.15E-02 5.O1E-02 6.05E-02 4.85 E-02 1.09E-01 Activity pCi/g 1.75E-01 1.79E-O1 1.10E-01 1.35E-01 3.84E-01 2.48E-O1 6.02E-02 2.35E-01 2.66E-01 Th-230 2 a Error pCi/g 1.33E-01 9.52E-02 1.09E-O1 1.06E-O1 1.40E-O1 9.77E-02 4.82E-02 1.06E-O1 7.45E-02 MDA pCi/g 6.26E-02 7,22E-02 6,49E-02 7.16 E-02 9.06E-02 2.22E-02 3,20E-02 3.92E-02 3.92E-02 Activity pCi/g

-7.92E-03 4.47E-02 3.91E-02 9.22E-02 9.47E-02 1.27E-01 7.42E-02 7.02E-02 1.04E-01 Th-232 2 a Error pCi/g MDA pCi/g 1.59E-02 6.26E-02 4.78 E-02 4.17 E-02 6.92E-02 6.49E-02 8,28E-02 2,72E-02 7.15E-02 6,04E--02 6.77E-02 2.22 E-02 5.07E-02 1.22 E-02 5.93E-02 4.80E-O2 4.88E-02 3.92E-02 I

L ______________________________________

I.

1,26E-01 4.50E-01.

1.14E-01 MEAN MAX STDEV 3.28E-O1 8.11E-01 2.09E-01 MEAN MAX STDEV 1.21E-01 4.05E-01 9.54E-02 MEAN MAX STDEV Page 4 of 6

SAMPLE ANALYSIS RESULTS FOR URANIUM - SUB SURFACE SOILS Sample Number L4BKGO1BJGSBSA01 L4BKGO1QJGSBSA01 L4BKGO1BJGSBSAO2 L4BKG01BJGSBSA03 L4BKG01BJGSBSAO4 L4BKG01BJGSBSA05 L4BKG01BJGSBSA06 L4BKG01BJGSBSA07 L4BKG01BJGSBSA08 L4BKGOIBJGSBSA09 L4BKG01BJGSBSA10 L4BKG01BJGSBSA11 L4BKGOIBJGSBSA12 L4BKGO1BJGSBSA13 L4BKG01BJGSBSA14 L4BKGO1BJGSBSA15 L4BKGO1BJGSBSA16 L4BK(GOICJGSBSA16 L4BKG01BJGSBSA17 L4BKG01BJGSBSA18 L4BKGOIBJGSBSA19 L4BKGO1BJGSBSA20 L4BKG01BJGSBSA21 U-234 Activity 2 o Error pCi/g pCi/g M DA pCifg Activity pci/g 3.06E-02 6.14E-02 4.52E-02 O.OOE+00 4.61E-02 8.13E-02 7.66E-02

-1.79E-02 2.54E-02 9.99E-02

-1.09E-02 2,19E-02 8.64E-02 5.86E-02 7.83E-02 6.07E-02 4,38E-02 8.80E-02 6.46E-02 4.74E-02 8.39E-02 7.87 E-02 0OOE+00O 2.26E-02 6.54E-02 7.36E-01 4,07E-01 3.23E-01 6.85 E-02 6.69E-02 4.05E-02 3.O1E-01 1.55E-O1 8.43E-02 5.19E-02 6.48E-02 6.10E-02 8.09 E-02 7.6 1E-02 7.93 E-02 3.85E-02 5.14E-02 3.98E-02 0.OOE+O0 0.00E+00 4.29E-02 2.00E-02 6.49E-02 8.41E-02 2.59E-01 1.21E-01 1.09E-01 4.68E-01.

1.60E-01 9.22E-02 2.38E-01 1.17E-O1 1.O9E-01 1.69E-01 9.99E-02 9.79E-02 2.00E-01 1.33E-01 1.43E-01 1.57E-02 5.46E-02 7.34E-02 5.44E-02 6.54E-02 7.17E-02 O.OOE+OO

-1.11E-02 O.OOE+O0 0,0OE+00 0.OOE+0O

-1.23E-02 O.OOE+O0 1.1OE-01 5.56E-03 2.19E-O2 1.94E-02 2.64E--02 1.17E-02

-1.25E-02 0.OOE+0D 1.19E-02 1.41E-02 2.35E-02

-1.16E-02 1.55E-02 O.OOE+O0 4.04E-02 U-235 2 o Error pCi/g 2.79E-02 2,93E-02 2.22E-02 2.84E-02 1,86E-02 0.O0E+00 2.47E-02 2.79E-02 1,56E-01 4.06E-02 4,39E-02 3.89E-02 4.66E-02 3.80E-02 2.51E-02 O.OOE+O0 2.37E-02 6.32 E-02 3.33 E-02 4.02E-02 3.09E-02 O.OOE-I00 4.67 E-02 MDA pCi/g 5.58E-02 5.08E-02 8.75E-02 5.73E-02 4.03E-02 7.99 E-02 9.73E-02 8,09E-02 8.10E-02 7.07E-02 3.23E-02 2.86E-02 4.39E-02 4.92E-02 9.88E-02 5.58E-02 1.75 E-02 9.3 1E-02 1.74E-02 7.65E-02 2.28E-02 2.87E-02 1.98E-02 Activity pCi/g O.OOE+O0 O.00E+00 4.26E-02 2.05E-02 0.OOE+00 0O.OE+00) 1.72E-01 0OE+0O 6,65E-01 2,43E-02 2.88E-01 9.42E-O2 7.30E-02 1.89E-02 1.46E-01 6.12E-02 3.07E-01 3.20E-01 2.38E-01 2.25E-O1 3.38E-01 4.72E-02 3.27 E-02 U-238 2 a Error pCi/g 0.00E+O0

.0.OOE+00 7.52E-02 6.66E-02 1.51E-02 0.00E+00 1.44E-01 2.26E-02 3.69E-01 4.30E-02 1.56E-01 7.74E-02 6,42E-02 4.35E-02 1.33E-01 8.74E-02 1.20E-01 1.46E-01 1.07E-01 1.10E-01 1.45E-01 5.5 1E-02 4.87E-O2 MDA pci/g 4.52E-02

4. 11E-02 7.O8E-02 8,64E-02 3.26E-02 6.46E-02 4.23E-O2 6.54 E-02 2.11E-01 4.05E-02 1.09E-O1 2.32E-02 3.55E-02 5.63E-02 4.29E-02 4.52E-02 7.74E-02 1.30 E-01 7.69E-02 9.79E-02 1,01E-Ol 2.32E-O2 5,07E-O2 Page 5 of 6

Sample Number L4BKGO1BJGSBSA22 L4BKGOIBJGSBSA23 L4BKGO1BJGSBSA24 L4BKGO1BJGSBSA25 L4BKG01BJGSBSA26 L4BKGO1BJGSBSA27 L4BKGO1BJGSBSA28 L4BKG01BJGSBSA29 L4BKGO1BJGSBSA30 U-234 Activity 2 a Error pCi/g pCi/g MDA pci/g 9.36E-O2 7.11E-02 1.97E-02 4.79E-02 4.80E-02 1.77 E-02 1.64E-O1 9.91E-02 9.25E-02 2.42E-01 9.72E-02 6.76E-02 1.42E-O1 7.87E-02 6.62E-02 1.75E-01 8.74E-02 4.03 E-02 1.86E-O1 7.99E-02 5.30E-02 5.28E-02 6,59E-02 6.21E-02

-1.04E-02 2.07E-02 8.19E-02 Activity pCi/g" 4.96E-02

-2.96E-02 7.47E-03 8.86E-04 5.35E-03 2.26E-02 0.00E+IO0 2.58E-02 0,00E+O0 U-235 2 o Error pCifg M DA pCi/g 7.40E-2 7.71E-02 4.19E-02 9.76E-02 3.02E-02 4.32E-02 2.39E-02 4.47 E-02 2.16E-02 3.09E-02 3.22E-02 1.67E-02 0.00E+00 1.17E-02 5.92E-02 7.67E-02 2.84E-02 5.43E-02

• Activity pCi/g 1.34E-02 2.40E-02 2.29E-01 1.96E-01 1.73E-01 2.11E-01 1.66E-01 6.81E-02 0.00E+00 U-238 2 o Error pCi/g 4.63E-2 3.39E-02 1.08E-01 8.55E-02 8.43E-02 9.67E-02 7.40E-02 8.23E-02 0.00E+00 MDA pCi/g 6.23E-2 1.77E-02 6.05E-02 5.11E-02 5.59E-02 4.03E-02 4.48E-O2 9.81E-02 4.40E-02 1.25E-O1 MEAN 7.36E-01 MAX 1.57E-O1 STDEV 1.05E-02 1.10E-01 2.43E-02 MEAN MAX STDEV 1.31E-01 6.65E-01 1.47E-0I.

MEAN MAX STDEV Page 6 of 6

a ZionSolutions, Inc.

EH&S Technical Support Document ZIONSOLUTIONS*

TSD # 13-004 Examination of Cs-I137 Global Fallout In Soils At Zion Station Revision 00 Harve*(F~rr -JRSCS Radiological Engineer Originator:

Date:

_,__,_/____/

I Reviewer:

?J4, o

• ,L.*

Date:

• /

.-9/13 Robert Deckder - ZionSolutions LTP Radiological Engineer Approval:

Date:

Steve Horvath - Zoo lutos aracterization/License Termination Manager

EH&S TSD # 13-004 Revision 00 Page 2 of 38 1.0 Introduction This TSD provides a review of information from published global fallout studies and Zion Solutions soil sample data. The TSD establish the technical basis for anticipated soil concentrations attributable to fallout and establishes criteria for investigating soil Cs-I137 concentrations that are higher than those anticipated due to word-wide fallout.

2.0 Table of Contents 1.0 Introduction............................................................................................. 2 2.0 Table of Contents......................

................................................................ 2 3.0 Background............................................................................................. 2 4.0 Definitions............................................................................................... 2 5.0 Calculations and Evaluations.......................................................................... 2 5.1 Background Cs-I137 Levels from Nuclear Weapons Testing........................................ 2 5.2 Background Cs-I137 Levels in Zion Soils............................................................ 15 6.0 Conclusion............................................................................................ 26 7.0 Attachments........................................................................................... 26 7.1 Attachment A - Zion Site Layout with Future ISFSI Location...................................... 27 7.2 Attachment B - All Soil Sample Results Background Studies and Class 3 Southwest Survey Units................................................................................................... 27 8.0 References............................................................................................ 27 3.0

Background

For confirmation surveys of non-impacted land areas and MARSSIM Class 2 and 3 land areas it is important to distinguish licensed materials originating from facility operations from world-wide fallout in order to establish reasonable action levels requiring further investigation. In order to establish investigation criteria indicative of Cs-I137 contamination levels in soil that are distinguishable from background levels, a review of predicted fallout levels and results of studies is provided and Zion Solutions soil sample results for Cs-137 in soils to date are compared to those anticipated from world-wide fallout based upon the literature.

4.0)

Definitions Investigation criterion-An activity limit at which further evaluation of the survey data is required for a MARSSIM Class I survey area. The investigation criterion is typically set at a value that ensures that the DCGLEMc will not be exceeded. [I]

World-Wide Fallout - The descent and deposition of radioactive material in the atmosphere onto the earth following a nuclear explosion, incident, or accident.

5.0)

Calculations and Evaluations 5.1 Background Cs-I 37 Levels from Nuclear Weapons Testing As noted in a "Historical Overview of Atmospheric Nuclear Weapons Testing and Estimates of Fallout In the Continental United States" by Beck and Bennet [2]. from 1945 to 1980, over 500 weapons tests were conducted in the atmosphere at a number of locations around the world.

These tests resulted in the release of substantial quantities of radioactive debris to the environment. The amount of fallout and its geographical distribution was a function of the location, yield, height of burst, and meteorological conditions associated with the various tests.

[2] As seen in Figure I only Cs-I137 is readily detectable by gamma spectroscopy and has a long enough half-life to remain present in the environment from fallout.

EH&S TSD # 13-004 Revision 00 Page 3 of 38 Nuclide Half-lifc PBq MT-'

P~lq Fission products:

'37Cs 30.2 y 5.9 950

'*r28.8 y

3.9 620

• °Ru 374 d 76 12,200 1Ce285(d 191 30,700)

'JZr 64 d 921 148,000 1Ba12.8 d

4730 759,000 J~l8.0(d 4210 675,000

'3"Te 3,3 d 10,500 1,700,000 Activation products:

4C 5,730 y

-0.85

'-213 31112.3 y

'-740

'-186,000 54Mn 312 d 15.9 3,980 23h2Ou24,110 y I1 Tracers:

x5*W 74 d 11,000 Figure 1 - Beck Summary of Some of the More Important Fission and Activation Nuclides Produced In Weapons Tests ["2].

As Beck and Bennet point illustrate in Figure 2, Cs-137 fall out is predominantly from nuclear weapons tests in comparison to accidental releases from accidents such as Chernobyl and Windscale.

Evenlt

'37Cs i3t11 239 +240pu All weapons testsa 950 675,000

-11 NTS tests"'t' 7

5,400

-0.5 Chernobyl accident"'

85 1,.760

-0.1I Hanford releasesc 27 Windscale accidentd' 0.02 0.74 a1 UNSCEAR (2000).

t, Beck (2001Ia).

TSP (1994).

,' UJNSCEAR (1993).

Figure 2 - Activity of 0s-137, 1-131, and Pu-239, 240 (PBq) produced by atmospheric weapons tests compared with reported releases that occurred as a result of accidents or production of fuels.

Deposition of cesium from fallout peaked in the United States in the mid-i1960's and contributions following 1980 are generally insignificant. The possible exception was depositions resulting from the Chernobyl nuclear reactor accident in 1986. However, while small increases could be measured in the United States, the increases were not significant in comparison to depositions from weapons testing fallout. [3] A PBq (petabecquerel) is 1015 Bq.

Estimates of the Cs-137 released into the atmosphere from the March 2011 Fukushima Daichii accident range from 13 x 1015 Bq (13 PBq) up to 50 x 1015 Bq (50 PBq) [4]

Thus Cs-I137 fallout in the U.S. is still predominantly from nuclear weapons testing in comparison to releases from nuclear accidents. Most of the fallout in the eastern United States from Nevada tests resulted from precipitation scavenging when the fallout clouds intersected rain clouds. [21 In the fall of 1951 the Health and Safety Laboratory (HASL) established a network of fixed stations throughout the world using a semiquantitative system based on deploying trays filled with water and/or trays of gummed film at weather stations. The gummed film and precipitation sampling provided estimates of daily or weekly deposition at a fairly large number of sites and allowed estimates to be made of the total global deposition. [2]

EH&S TSD # 13-004 Revision 00 Page 4 of 38 Fallout data is typically reported as activity per unit surface area (e.g., Bq/m 2, nCi/m2, etc.).

Note that I Bq equals approximately 27 pCi. This provides a more accurate depiction of the total deposition since the results are not influenced by the density of the soil or other medium on which the fall out deposits. In addition, results reported as activity per surface area are not influenced by the rate at which the nuclide migrates through the soil to as great an extent as typical environmental sample measurements based upon activity per unit mass. For example, two different locations with identical depositions in Bq/m 2 could have drastically different soil concentrations if one's soil was rich in organic material, and thus had a lower bulk density, and the other was clay like or sand like material, with a high bulk density. Even if the nuclide was distributed to the same depth, the difference in the densities of the soil types would yield different soil concentrations in pCi/g.

Estimates of Nevada Test Site (NTS) fallout depositions were confirmed by large-scale soil sample surveys carried out by HASL and U.S. Department of Agriculture (USDA) investigators. Large-scale soil sampling was carried out every few years beginning in the early 1950's with the last survey occurring in the late 1960's. Generally about 50 to 100 sites were sampled during each survey. Over 500 samples were collected over the testing period. Many sites were resampled several times allowing estimates to be made of the deposition since the previous sampling. The samples were at first analyzed only for Sr-90. Many of the early samples were retained at HASL and later reanalyzed for long-lived radionuclides, such as plutonium isotopes and Cs-1 37. [2] The total deposition of Sr-90 from all tests as a function of latitude, based on the soil sample and deposition data, is shown in Figure 3. As can be seen, the deposition varied with latitude, peaking in the 40 to 50 degree north latitude band. This apparently reflects preferential stratospheric to troposphere transfer at the mid latitudes.

Sr-40 Deposition 100 40

<~-N. Degrees Latitude S->

Figure 3 - Variation of total Sr-90 deposition with latitude. [2]

It also reflects the fact that most of the debris was injected into the stratosphere in the northern hemisphere, and that the transfer from the northern hemisphere to the southern hemisphere is very slow. About 460 PBq of the estimated total 604 PBq of Sr-90 deposited globally was

EH&S TSD # 13-004 Revision 00 Page 5 of 38 deposited in the northern hemisphere. Zion Illinois has a latitude of 42.44610° N which corresponds to the latitude with the highest fallout deposition.

'E Z0

$otitheiTr"h*ni*he*'e lmm*mqwm p

m Figure 4 - Cesium-I137 deposition density in the northern and southern hemispheres [5]

As seen in Figure 4 Cs-I137 fallout peaked in the 1963 to 1964 time frame in the 40 to 50 degrees north latitude region of the northern hemisphere. UNSCEAR [5] reports provide estimates of total deposition of various radionuclides from global fallout. While such reports are suitable for estimating the overall or average hemispheric impact, they do not reflect the actual geographical variation across the continental United States. [2] It is well established that the major mechanism for the deposition of global fallout was precipitation scavenging and rainout. Numerous studies demonstrated that in any particular area the deposition was generally proportional to the amount of rain experienced. [2] Fallout depositions vary longitudinally across the Continental U.S. due to washout and rainfall patterns. Zion is located at 87.83280 W longitude and would have a correction factor of 0.8 for NTS related fallout. [2]

Longitude (degrees west)

Latitude 60-90 90-1I00 100-110 I110-120

> 120 25-30 0.45 0.45 0.6 0.5 0.5 30-35 0.6 0.65 1.2 1.0 0.7 35--40 0.8 0.9 1.5 2.0 0.8 45.-45 1.0 IJ 1.6 1.9 0.6 45-50 0.8 0.85 0.9 1.0 0.5 Figure 5 - Estimated Longitudinal Variation in NTS Fallout by Longitude Over the United States

[2]

This does not account for variation in fallout deposition patterns for non-NTS weapons testing global fallout.

Local or regional measurements of Cs-I137 are typically compared to baseline estimates of Cs-137 concentrations world-wide which are calculated from deposition measurements of Sr-90.

EH&S TSD # 13-004 Revision 00 Page 6 of 38 These estimates use a well-established Cs-I137 to Sr-90 deposition ratio of 1.6 for fallout. [3]

Table 2.1 (Figure 6 of this TSD) of a 1994 report on Cs-137 distributions in residential areas

[3] provides such estimates of Cs-I137 depositions by latitude integrated to 1980 and decay corrected to 1991.

Table 2.1 Estimates of Potential Cs-137 Concentrations in Soils by Latitude and Assulned Depth of Distiibution Concentrtions if distributed from LATUTUDE BA*ND Dem'ees 70-SON 60-70N 50-60N 40-50N 30-40N 2 0-30ON 1o-20N I0-20S20-30OS 30-408 40-5SO 50-608 60-705 70-S0S Deposition (a)

Cs-13 7 Bq/cm2 (pCi/cmi2) 0.11 2.'9 0 to 5cm (b) 0 to 30cm (b) p)Clig (B~q/Kg) pciig (Bq/Kg)

'0.20 7.4 0.03 1.2 0.28 0.46

'0.52 0.37 0.28 0.19

'0.13 0.08 0.07 0.11 0.12 0.14 0.08 0.06 0.04 7.5 12.5 14.0 1*0.1 7.6 5.1 3.5 2.1 1.8 3.0 3.3 3.8 2.0 1.5 1.0 0.51 0.85 0.9;4 0.68

'0.52' 0.35 0.24

0.14

,0.12 0:20 0.22 0.26 0,14 0.10 0.06 15.8

'31.3 35.0 25.3 19.2

.12.9 4:5 5.2 9.6 5.1 3.8 2.4 0.08 0L14 0.16 0.11 0.09 0.06

.0.04

'0.02 0.02 0.03 0.04 0.04 0.02 0.02 0.0*1 3.1 5.2 5.8 4.2 3.2 2.1 1.5 0.9 0.8 1:3 1.4 1.6 0.8 0.6 0.4 (a) Cs-137 Deposition estimnate from Sr-90 assimunig a ratio of 1.6 Cs-137 to St-90 integrated to 1980 (b) Soil concentration estimated assumfing an average soil density of 1.6 g/cm3 and the deposition averaged over the entire depth. The values are corrected for decay to 1991.

Figure 6 - Estimated Soil Fallout Concentrations by Latitude Based Upon Estimates of Global Fall Out [3]

The calculated soil concentration in the 40 to 50 degrees north latitude where Zion is located is 0.16 pCi/g for a 0 - 30 cm core length of soil with a bulk density of 1.6 g/cm3. [3] As noted in the report, such generalized estimates of soil concentrations from global fallout do not adequately address the variations in actual fallout depositions and variability in Cs-I137 concentration and redistribution in the environment. [3] The authors of the referenced study [3]

state that within the region of interest (400 to 500 North Latitudes) and given normal soil variability, soil Cs-I137 concentration would be expected to range from about less than 0.2 pCi/g to 1 pCi/g. These estimates assume an average soil density of 1.6 g/cm3 which is reasonable for U.S. soils. However, soil density can vary significantly in local areas and may commonly range from about 1 to more than 2 g/cm3. Such variations can cause concentrations to vary several fold or more even with the same fallout depositions. For instance, varying the

EH&S TSD # 13-004 Revision 00 Page 7 of 38 soil density over this range changes the estimated range of Cs-I137 concentrations in the soils from 0.1 pCi/g to 2.0 pCi/g. However, cesium migrates slowly and is not evenly distributed by depth. Using Cs-I137 soil migration measurements, the study [3] predicted a up to 0.8 pCi/g [30 Bq/kg] in the first 0.5 cm of surface soil and about 0.1 pCi/g [3.7 Bq/kg] in soil at the 5 to 30 cm depth. [3]

The study from which the above information was obtained was published in 1994. [31 The study examined natural variation in fallout Cs-I137 concentrations in residential areas in comparison to the predicted range of concentrations of 0.1 to 0.8 pCi/g Cs-I137 concentrations from fallout. [3] The study data included about 600 sample locations from over 200 properties in central New York, 26 properties in Beverly, Massachusetts, and 10 properties in northeastern Pennsylvania. The specific sites reviewed in this study all are in the 400 to 500 North Latitudinal region as is Zion. All the data was decay corrected to 1991.As seen in Figure 7, for Central New York the range of and geometric mean of Cs-i137 concentrations were higher than the predicted 0.10. to 0.8 pCi/g range in drainage areas and the upper 95%

confidence levels of the non-drainage areas was 3 times higher than the predicted 0.8 pCi/g value. [3]

Table 3.1 - Colonie,.NY - Summary~ Cesium-137 in Soil Data and Statistics unitsp{L Aritlm~etic Measured Mean G3eometric Condition1! &

Number of Range

,(pCi/g) +

Meani Range (pCi/g) for.

Depth,(cni)

Samples (pCi/g)

(1 Sigmaa)

(p'Ci/g) 95% of Distmibtition Drainage.Areas All Samples 109

<0.01 - 12 2.1 +__2.1 0.94 10.05 - 17

'0-5 cm S3

<0.04 -11 2.1i +2__.4 1.1 i 0.09 -13 5--15 cm 12 0.4 122 2*.8+,3.3 1.7 0.23 -1.2

>15 cm 10

<0.010

<0.15:+._0.24 0.07 0.01 -0.75 Non-Drainage.Areas.

All Samuples 347

<0.01 - 4.4 0.66 +_ 0.70 0.39 0.05 - 3.3

'0-5 cm 277

<0.01 -4.4 0.74 +0.75 0.47 0.07-3.4 5-15.cm!

58

<0.01 -2.1 0.41+-*0.24 0.25 0.04 -L!9

>15 cm 17

<0.02-0.7'

<0.2-+0.21 0.12 0.01 -1.0 1-Conditions include drainage areas (locations that collect water) and nondrainage areas (open areas such as lawns and fields. 2 - Subsurface samples where [sic] taken from high concentration area, and, hence, are biased high in comparison to surface samples. 3 - About 40% of the samples contained cesium-I137 at levels below detectable limits.

Figure 7 - Colonie New York Residential Soil Concentrations The Beverly MA (Figure 8) and Luzerne County PA (Figure 9) data had somewhat lower geometric means and upper 95% confidence ranges. However they were still well above the predicted concentrations based upon overall world-wide fallout deposition in the 40 to 50 degree North latitude.

EH&S TSD # 13-004 Revision 00 Page 8 of 38 Table 3.2 - Be~verly MAL

- Cesinm 137 in Soil Summary Data and Statistics Units pCi/g

'Range (pCi/g for 95!%of Distribution Drainage A-rea s

-l A!Samples

____2__

0.02 -11 1.5 +2.4 0.53 0.02-11 0-15 cm 190,02-11 1.7+'2.7 0.63 j

0.04-11 15-30 cliii1 0.02 -4.6 1.1 + 1.6.

0,34 1

0.01 -9.0 N~n-Draina-,e Areas

.All Samples 195

<0.01 - 2.8 0.32 _+0.38 0.19 0.02 - 1.6 0-5 cui 1,04 0:04-2:8

.043._+ 0.41 0.31 0.06-1.6.

15-30 cm S4

<0.01 -2.5 0.19__+0.31 0.11 0.04-0.317

>30 cm

• 7 0.07-0.32

.0.12 +0.09 0.11 0.04-0.31 "Wet" Areas (TiclaliBeaclh) 21 0,01 -0.12 0.04_+0.04 0,04 0.01 -0.16 1 - Conditions include drainage areas (areas that collect water) and nondrainage areas (open areas such as lawns and fields).

Wet areas are those that are frequently under water (tidal and beach front areas).

Figure 8 - Beverly MA Residential Soil Concentrations

EH&S TSD # 13-004 Revision 00 Page 9 of 38 Table 3.3(a) - Luzerne County, PA - 'Cesiuin-137 in Soil Suimmarv Data aiid Stntistics

_________Units pCi/g Number IMeasu.red Men Geometric J____

Condition !&

of Range (pCi/g)

Mean Range (pCi/g) for

.Dpth (cm) samples (pci/g)

+/-- (1 sigma)

(pci/g)

.95% of Distribiition Drahmage Areas All Samples 33 0.16 -7.5 2*5-,+2*0 1.8 0*33 -1I0 Subsurfade'Samples 22 OA6 -7.5 2.7 + 2,1 2

0.33-1]2 0-5 cm 12

0.16-7.5 3.1 -- 2.6 2

0321 - 19

• 0-10 cm 10 0.8 - 47 2.2+1i.2 1.9 0.7 -5.3 Stubsui'face S

0.32 - 7.2 2.6 + 2.2 1.8 0.3 - 12 5-15 cm 4

0.68 -7.2 3:0__+ 3*3 2.1 0.21 -20 10-:15 cm 3

0.32--2.3 1.6-+/-i.1 1.2 0.13 -1.1 Non-Drainage.A'eas A&ll Samples 21 0.08 - 1.5

,0.62 +/- 0.4 0.47 0.1 - 2.4 SSubs~urfaceSamples

,18 Q.19 - 1.5 0:674- 0.39 0.56 0.16-2 0-5 'cii 10

.0.13 - 1.5 0.73 +/- 1.4 0:56 0.11 -2.8

,0-10 cm 8

0.39 -1.00 0.59 4- 0.48 0155

0.28 - 1.i Susrhe3 0.0S-0.77 0.32+/-0.77 0.18 0.02-2.1

>5 cm 1 - Conditions include Drainage areas (areas that collect rain water) and nondrainage areas (open areas such as lawns and fields). Some areas were also classified as disturbed and undisturbed Figure 9 - Luzerne County PA Residential Soil Concentrations All three locations found Cs-I137 concentrations in drainage areas were two to three times higher than in non-drainage areas. As seen in Figure 10, evaluation of the Luzerne County data relative to whether the soil was disturbed or undisturbed showed that the highest concentrations were found in the upper 5 to 10 cm of undisturbed soil as would be expected.

Since the highest levels are found in the upper 5 cm, mixing of the soil lowers the overall average concentration. Disturbed soils included tilled locations and locations where fill was used.

EH&S TSD # 13-004 Revision 00 Page 10 of 38 Table,3.3(i)- Luzeine county, PA - Cesiuin-137 in Soil summar.y Data and Statistics Disturbed Versus Undisturbed :Soil Units pCi/g Aritlmaetic Measured Mean

,Geometlic Condition &

Num~ber of Range (pCi/g)

Mean Range (pC i!g), for Depth (cin)

Samples (pCi/g)*

+ (1 signa)

(pCi/g) 95%-of Distribution Drainage Areas Surface 0-5 cm Undisturbed 9

0.7 -7.5

+ 2,9

]

3.1 J

0.58 -17 Disturb'ed 3

j0.'16 -0.99 j0.654-0.14 0.5 0.1 -3.6 Surface 0-1I0 cm Unldisturbed

[

6

- 4.7 2,4+/--1.4 ]

21 0.75 -6.1 Disturbed

[

4

- 2.8 j3.9+/-4,0.81 J 1.7

,0259 -4.8 Non-.Drainage A*reas Surface 0-5 cm Undisturbed 4

0.58 -1.4

0..37 0.85 0.39 - 1.8 Disturbed 6

0.13 -1.5 0:2+/-.6[04 0,07 -2.8 Surface 0-10 cmr Unldisturb. d

[

6 0.39 -14~

0.61 4-0.26 0.57 0.26-1.3 Disturbed 2

j0.45 - 057 0.51 +/-0.08 0:51 0,39 -0.7 1 - Conditions include drainage and nondrainage areas and disturbed (normally flower beds or areas where there was evidence of fill material) and undisturbed areas (those with no evidence that the soil was excavated or filled).

Figure 10 - Luzerne County PA Disturbed and Undisturbed Residential Soil Concentrations The analysis indicates that cesium moves slowly in the soil and unless physically disturbed and remains in the surface layer. The data also indicated that Cs-i137 concentrations in drainage areas (e.g., roof driplines and drain spout discharge locations) are significantly higher than concentrations in open areas. More specifically, the study resulted in 5 general conclusions or findings:

The analysis indicates that fallout deposition data do not adequately predict the variability in local background concentrations for Cs-i137 in soil. Surface samples from undisturbed soil produce the greatest variability and can differ by several orders of magnitude. The 1991 surface sample geometric mean concentrations were in the range from 0.3 to 3 pCi/g

[10 to 110 Bq/kg] with the range of the 95th percentile concentrations extending to about 20 pCi/g [700 Bq/kgJ. [3]

• Areas that collect rain water have significantly higher concentrations of Cs-137 in soil than open areas. The geometric mean concentrations in drainage areas are typically 3 times that of non-drainage areas. [3]

• The concentration of Cs-I137 in soil decrease significantly with depth. In general, most of the cesium is contained in the top 15 cm of undisturbed soil. [3]

Surface samples taken from the 0 to 5 cm depth in undisturbed soil had significantly higher concentrations than those taken at the same depth in disturbed soil. However, surface

EH&S TSD # 13-004 Revision 00 Page 11 of 38 samples taken over the 0 to 10 cm or 0 to 15 cm range were less sensitive to soil disturbance. [3]

• The lognormal distribution is generally more representative of environmental concentrations of Cs-I137 than the normal distribution. [3]

The study concluded that in general, fallout deposition data can be used to predict total surface inventory in a large area but it does not provide a good measure of central tendency and variability for background Cs-i137 concentrations for remedial action or decontamination planning activities in residential, commercial or industrial areas. A reasonable estimate of such background variability can only be obtained by direct sampling and measurement of local data from a nearby area (with like soil and drainage conditions) that has not been affected by the operating facility. [3]

The study reinforces that in addition to local variations due to atmospheric dispersion and washout, factors such as the land-use characteristics, soil bulk density, amount of organic material and drainage affect the Cs-I137 levels from fallout in the soil. Transport of the cesium in the soil, once it is deposited, is affected by many site specific factors including soil type, rainfall, drainage, terrain, vegetation and local activities and conditions. Furthermore, local meteorological conditions can have significant impact on the fallout deposition and transport in a given area. Finally, sampling protocol significantly effects the reported soil concentrations.

[3] Once in contact with the soil, Cs-I137 is tightly bound by the clay-size soil fraction and organic matter, and its further movement by natural chemical processes in the environment is limited. [6] Soils that have been disturbed since the peak depositions in the 1960s, such as those from agricultural tilling, construction work or made ground (e.g., fill) would have lower overall fallout concentrations than natural undisturbed locations due to the variation in concentrations with soil depth. Undisturbed soils in forested areas tend to have higher Cs-I137 concentration in the upper 5 to 10 cm due to root uptake and leaf litter deposition which continuously re-deposits Cs-i137 on the surface of the forest floor. "Drainage' areas or areas where water tends to accumulate and evaporate are locations that concentrate Cs-I137 in soil.

These factors apply to more natural forested and agricultural areas as well as residential areas. A study of Cs-137 fallout redistribution in soils was conducted in 1974 and 1975 for the Brunner Creek watershed of White Clay Lake in Shawano County Wisconsin. [6] As noted in Figure 11, White Clay Lake is located northwest of Green Bay Wisconsin approximately 190 miles from Zion at Latitude 44-48'05" N and Longitude: 088-24'15" W. It is in the same zone of higher fallout deposition between 40 and 50 degrees North as Zion Station.

EH&S TSD # 13-004 Revision 00 Page 12 of 38 Figure 11 -White Clay Lake Shawano County, WI Location The study [6] measured fallout Cs-I137 levels (nCi/m 2) for undisturbed woodland, pasture and marsh soils as well disturbed corn and alfalfa field soils. Major soil types in the watershed area were Onaway loam, Salona loam, and Shiocton silt loam. Land use types sampled were from a 40- to 50- year old upland oak-maple forest that showed no evidence of soil erosion, from corn and alfalfa fields, from pastures, and from a low marshy area where Brunner Creek enters White Clay Lake. Samples of the sediment in the delta area where Brunner Creek enters White Clay Lake were also collected. [6] The data from the reported results are provided in Figure 12.

EH&S TSD # 13-004 Revision 00 Page 13 of 38 0-. 5 53.7

• 2.0O 54.9 *: 3.S 19.3

• 0.8 18.7

• 0.8 38.6

• 4.0 51.8

• 11.5 5-10 41.6

• 2.8 40.0 *: 0.8 19.8

• 0,8 20.2 *k 0.8 4,5.0 *k 4.7 17.3 -, 5.0 10.-IS 18.1 *2.7 14.3 *- 0.1 19.5 *k 0.6 19.3

• 0.8 33.2

• 5.8 3.0

• 1.3 15.20 6.6

• 0.9 3.6 *: 1.6 19.4

• 0.5 18.1

• 0.9 28.7

• 7.0 3.0

• 1.3 20-25 3.1

• 1.1 2.5 *k 0.4 17.5

• 0.9 14.7

• 1.4 29.2 d* 8.2 0.8

• 0.5 25-30 ND ND 9.6 *k1.4 9.8 d1.5 9.1 **2.8 0.3**0.5 30-35 NI)

ND 7.6**1.6 9.0 *1.2 ND ND 35-40 NiD ND 3.2**0.8 3.4*i0.7 ND ND 40-45 ND ND 1.6*:*0.8 0.9*4-0.2 hNd ND Total**

123.6

• 5.1 115.2 t 0.3 110.0 ** 4.1 107.8

• 5.1 184.0

• 17.6 69.9

• 16.7 Range*

102-141 114-116 80-128 68.-141 89-256 31-176 N*6 2

23 23 7

• NI) No smplesclletd

• • Totel and Ranse axe based on the summarization totals for each sample site.

'* Number of samples per det and numbe of sample sites per vegetation type.

Figure 12 - Average concentrations and standard error of the mean of Cs-I137 (nCi/m') in soil profiles under different conditions.

The data indicates that Cs-i137 is retained in the upper 15 cm of undisturbed soils and that collection by marsh and lake sediments of eroded soils can lead to high concentrations similar to the upper layers of undisturbed soils. Although the data set is limited, it can be corrected to pCi/g based upon 1000 pCi/nCi and an average soil bulk density of 1.63 g/cm3 which equates to 8000 grams of material for every 5 cm of depth over a 1 m2 area. Assuming sample dates of January 1, 1975 for the samples collected in 1974 and 1975 this a 38.4 year decay time to June 1, 2013 which is just over the 30 year half-life of Cs-i137. The decay corrected values in pCi/g at an average bulk density of 1.63 g/cm3 are provided in Table 1.

EH&S TSD # 13-004 Revision 00 Page 14 of 38 Table I -Brunner Creek Drainaae Basin Decay Corrected Cs-I137 Concentrations F

F T

T Oak-Maple Pasture Corn Alfalfa Marsh Sediment a

4.

1 1

4 4.

Depth cm 0-5 5-10 10-15 15-20 20-25 25-30 30- 35 35-40 40-45 Activity Error pCi/g pCi/g 2.8E-01

+

1.0E-02 2.1E-01

-+ 1.4E-02 9.3E-02

+

1.4E-02 3.4E-02

+/-

4.6E-03 1.6E-02

+/-

5.7E-03 No Sample No Sample No Sample No Sample Activity Error pCi/g pCi/g 2.8E-01

+/-+

1.8E-02 2.1E-01

+/-+

4.1E-03 7.4E-02

_+/- 5.1E-04 1.9E-02

+

8.2E-03 1.3E-02

+/-

2.1E-03 No Sample No Sample No Sample No Sample Activity pCi/g 9.9E-02 1.0E-01 1.0E-01 1.0E-01 9.0E-02 4.9E-02 3.9E-02 1.6E-02 8.2E-03

+

-+

+_

+

+

Error pCi/g 4.1E-03 4.1E-03 3.1E-03 2.6E-03 4.6E-03 7.2E-03 8.2E-03

4. 1E-03 4.1E-03 Activity pCi/g 9.6E-02 1.0E-01 1.0E-01 9.3E-02 7.6E-02 5.0E-02 4.6E-02 1.7E-02 4.6E-03

+r

+

+

+r

+r

+r Error pCi/g

4. 1E-03 4.1E-03 4.1E-03 4.6E-03 7.2E-03 7.7E-03 6.2E-03 3.6E-03 1.0E-03 Activity Error pCi/g pCi/g 2.0E-01

+/-

2.1E-02 2.3E-01

+/-_

2.4E-02 1.7E-01

+/-

3.0E-02 1.5E-01

+/-

3.6E-02 1.5E-01

+/-+ 4.2E-02 4.7E-02

+/-

1.4E-02 No Sample No Sample No Sample Activity Error pCi/g pCi/g 2.7E-01

+/-

5.9E-02 8.9E-02

+/-+ 2.6E-02 1.SE-02

+/-+ 6.7E-03 1.5E-02

+/-+ 6.7E-03 4.1E-03

+/-

2.6E-03 4.1E-03

+/-

2.6E-03 No Sample No Sample No Sample Total.-

0.636

+/-

0.026 0.592

+/-

0.003 0.566

+_ 0.021 0.554

+/-

0.026 0.946

+/-

0.091 0.359

+/-

0.086 0-15 cm Average 0.194

+/-

0.013 0.187

+/-

0.008 0.100

+/-

0.004 0.101

+/-

0.004 0.200

+

0.025 0.124

+/-

0.031 30 -45 cm Average No Sample No Sample 0.021

+/-_ 0.005 0.023

+

0.004 No Sample No Sample Range 0.525 0.725 0.586 0.597 0.453 0.658 0.350 0.725 0.458 1.316 0.159 0.905 Number of Samples 6

2 23 23 7

9

EH&S TSD # 13-004 Revision 00 Page 15 of 38 The concentration of Cs-I137 was highest in the marsh community where concentrations up to 256 nCi/m 2 (e.g., 1.32 pCi/g decay corrected) where some evaporative concentration would be expected. This is also a deposition area for soil particles eroded from the upland.

Concentrations of Cs-I137 were lowest in the alfalfa and corn fields where erosion had occurred, removing some soil and its associated Cs-I137. (6] Tilling of the soil which mixes soils homogeneously over a 30 cm to 40 cm depth also would have contributed to lower overall concentrations although this was not noted in the study. Fill material from local gravel/sand pits or construction activities that mix soils over a deeper horizon than 15 cm would result even lower overall concentrations.

5.2 Background Cs-I137 Levels in Zion Soils Two studies on soil type and background fallout levels have been conducted in the immediate vicinity of Zion Station. These studies have focused on areas in the eastern portions of the property near Lake Michigan. These areas have consisted of Hosah Park non-impacted areas

[7] and areas located north and northwest of the facility. [8] It was determined that the best location for measuring background would be outside the restricted area boundary toward the north as based in part on Reference 6.1 of one of the studies [8], Annual Report on the Meteorological Monitoring Program at Zion Nuclear Power Station for 2010, Murray and Trettel, Inc. 2/21/2011. The reference demonstrates that winds are predominately from the west and northwest. As a result, locations north and northwest of the restricted area are less likely to be impacted by airborne particulate and gaseous effluents from past plant operations.

An initial determination of background Cs-I 37 levels was conducted to determine the radionuclide activity concentration of key radionuclides in non-impacted soils adjacent to the Zion Nuclear Station. [7] The area chosen for the survey was the Zion City Park District's Hosah Park, located north east of the Zion Nuclear Station, at the end of Shiloh Blvd. [7], as seen in Attachment A. The park consists of open land areas with a small shelter and several asphalt walking trails. There is evidence of several old foundations present indicating some potential soil disturbance since the.1960's. The land area is covered with native grasses and low lying brush. For the most part the open land area appeared not to have been disturbed for a number of years. Prior to the survey, thirty (30) soil sampling locations were identified in Hosah Park. The sampling locations were chosen in areas that appeared to be undisturbed with minimal vegetation as shown in Figure 13.

EH&S TSD # 13-004 Revision 00 Page 16 of 38 mum tiNS tiNS titUS tiNtS U

I I

I t

Ii

!I I

I Figure 13 - Hosah Park Background Soil Evaluation Location [7]

The sampling protocols, analyses and results are described in the technical report "Determination of Radionuclide Activity Concentrations In Soils In Non-Impacted Soils Adjacent to the Zion Nuclear Station, July 2012." [7] At each sampling location a surface (0 -15 cm) and a subsurface (30 - 60 cm) soil sample was collected. As they were collected each soil sample was screened in the field to remove debris, vegetation, and rocks greater than 1 cm in diameter. A total of 64 samples were submitted to an offsite laboratory for analysis. Each soil sample was analyzed for gamma emitting nuclides by gamma spectroscopy. These included (Co-60 and Cs-i137), Sr-90, thorium isotopic (Th-228, Th-230, and Th-232), and uranium isotopic (U-234, U-23S, and U-238). The sample analysis results for select radionuclides are provided in Attachment 3 for the surface soil samples and in for the subsurface soil samples of the report [71. The Cs-I137 results for the surface (SSS) and subsurface (SSB) Hosah Park samples are provided in Table 2 below.

EH&S TSD # 13-004 Revision 00 Page 17 of 38 L4BKG01BJGSSSA01

-2.61E-03 NO 555 L4BKG01BJGSBSA01 1.98E-02 NO SSB L4BKG01C.JGSSSA01 2.49E-02 NO 555 L4BKG01QJGSBSA01 2.19E-02 NO SSB L4BKG01BJGSSSA02 1.37E-01 YES 555 L4BKG01BJGSBSA02 1.59E-02 NO SSB L4BKG01BJGSSSA03 8.32E-02 YES SSS L4BKG01BJGSBSA03

-1.20E-02 NO SSB L4BKG01BJGSSSA04 1.23E-01 YES 555 L4BKG01BJGSBSA04 1.94E-02 NO SSB L4BKG01BJGSSSA05 1.72E-01 YES 555 L4BKG01BJGSBSA05

-6.27E-03 NO SSB L4BKG01BJGSSSA06 4.97E-01 YES SSS L4BKG01BJGSBSA06 4.61E-03 NO SSB L4BKG01BJGSSSA07 3.34E-01 YES 555 L4BKG01BJGSBSA07 5.09E-03 NO SSB L4BKG01BJGSSSA08 1.22E-02 NO 555 L4BKG01BJGSBSA08

-6.13E-03 NO SSB L4BKG01BJGSSSA09 2.66E-01 YES 555 L4BKG01BJGSBSA09

-3.70E-03 NO SSB L4BKG01BJGSSSA10 1.94E-01 YES SSS L4BKGO1BJG5BSA10

-2.22E-02 NO SSB L4BKG01BJGSSSA11 1.51E-01 YES 555 L4BKGO1BJGSBSA11 1.10E-02 NO SSB L4BKGO1BJGSSSA12 3.12E-01 YES SSS L4BKG01BJGSBSA12 1.32E-02 NO SSB L4BKG01BJGSSSA13 3.17E-01 YES 555 L4BKG01BJGSBSA13 1.13E-02 NO SSB L4BKG01BJGSSSA14 1.05E-02 NO 555 L4BKG01BJGSBSA14 9.30E-03 NO SSB L4BKG01BJGSSSA15 2.80E-01 YES 555 L4BKG01BJGSBSA15

-2.27E-03 NO SSB L4BKG01BJGSSSA16 2.18E-01 YES 555 L4BKG01BJGSBSA16 1.05E-01 YES SSB L4BKG01QJGSSSA16 7.57E-03 NO 555 L4BKG01CUJGSBSA16

-6.13E-03 NO SSB L4BKG01QJGSSSA17 2.52E-01 YES 555 L4BKG01BJGSBSA17 4.03E-02 YES SSB L4BKG01CUiGSSSA18 8.86E-02 NO 555 L4BKGO1BJGSBSA18

-6.63E-03 NO SSB L4BKG01QJGSSSA19 8.06E-02 YES 555 L4BKGOIBJGSBSA19 5.66E-03 NO SSB L4BKG01QJGSSSA20 4.02E-01 YES 555 L4BKGO1BJG5BSA20

-4.67E-03 NO SSB L4BKG01O.JGSSSA21 6.51E-01 YES 555 L4BKG01BJGSBSA21 1.26E-03 NO SSB L4BKG01BJGSSSA22 2.53E-01 YES 555 L4BKG01BJGSBSA22 4.81E-03 NO SSB L4BKG01BJGSSSA23 2.25E-01 YES 555 L4BKG01BJGSBSA23 2.14E-01 YES SSB L4BKG01BJGSSSA24

-7.93E-03 NO 555 L4BKG01BJGSBSA24 1.62E-02 NO SSB L4BKG01BJGSSSA25 2.89E-01 YES 555 L4BKG01BJGSBSA2S 1.17E-03 NO SSB L4BKG01BJGSSSA26 2.01E-01 YES 555 L4BKG01BJGSBSA26

-1.54E-02 NO SSB L4BKGO1BJGSSSA27 2.27E-01 YES 555 L4BKG01BJGSBSA27 1.07E-01 YES SSB L4BKG01BJGSSSA28 2.41E-01 YES 555 L4BKG01BJGSBSA28 2.41E-01 YES SSB L4BKG01BJGSSSA29 2.77E-01 YES 555 L4BKG01BJGSBSA29 4.50E-02 NO SSB L4BKGO1BJGSSSA30 2.60E-01 YES 555 L4BKG01BJGSBSA30 1.61E-02 NO SSB When the Hosah Park data is sorted by the Cs-I137 activity in pCi/g and assigned a rank order, the resulting plot shows several background distributions as seen in Figure 14. A frequency plot of the data, provided as Figure 15, also shows several background distributions.

EH&S TSD # 13-004 Revision 00 Page 18 of 38 Rank Order Plot All Hosah Park Cs-137 Result pCi/g 7.00E-01 6.00E-01 5.00E-01

,.4.AIHaC-37Rut i!

4.00E-01 3.00E-01 2,00E-OI1 1.OOE-O1 O.OOE+00*

10 20 30 40 50 60 70

-1.00E-O1 Figure 14 - Rank Order Plot of All Hosah Park Cs-137 Soil Sample Results in pCilg Frequency Plot All Hosah Park Cs-137 Results pCi/g 35 30

• --Frequency 15 101

-0.10 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 pCi/g Figure 15 - Frequency Plot of All Hosah Park Cs-137 Soil Sample Results The Hosah Park concentrations align well with the decay corrected Brunner Creek concentrations for undisturbed forest and pasture soils and disturbed corn and alfalfa field data in Table 1. As expected the range and distribution of the subsurface 30 - 45 cm Cs-I137 concentrations (Figure 17) is lower than the 0-15 cm surface samples (Figure 16).

EH&S TSD # 13-004 Revision 00 Page 19 of 38 Frequency Plot Hosah Park Surface Soil Samples Cs-137 pCi/g 8-Undisturbed

-4Frequency 6

Disturbed 4

Bulk Density Or anic 4 /

/

\\

Content and Drainage 1

0 I

I I

-0.10 0.00 0.10 0.20 0.30 0.40 0.50 0.60 pCi/g Figure 16 - Frequency Plot of Hosah Park Cs-I137 Surface Soil Sample Results Frequency Plot Subsurface Hosah Park Cs-137 Results pCi/g 16 14

-* -Frequency 12 10 8

4

-0. 5 0.00 0.05 0.10 0.15 0.20 0.25 0.30

-2 pCl/g Figure 17 - Frequency Plot of Hosah Park Cs-I137 Subsurface Soil Sample Results The surface sample results are indicative of a lower disturbed soil concentration mingled with a higher undisturbed concentration that ranges out to just over twice the Undisturbed mean concentration of 0.3 pCi/g, This is consistent with the ranges relative to the mean reported for

EH&S TSD # 13-004 Revision 00 Page 20 of 38 the residential soils [3]and agrarian soils at Brunner Creek [6]. The overall surface sample data had a mean Cs-I137 concentration of 0.211 pCi/g and a standard deviation of 0.148 reflecting the overall mean and standard deviation for disturbed and undisturbed soils. When only positively identified results that were above the two sigma error and minimum detectable activity (MDA) were included in the sample set the mean concentration was 0.26 pCi/g, a standard deviation of 0.13 pCi/g and an upper confidence level of 0.31 pCi/g were calculated for the positive results. The report concluded that individual activity concentrations as high as 0.74 pCi/g (e.g., 6.51 E-1 pCi/g maximum + 2 o error 8.77-E-2 pCi/g) for Cs-1 37 in undisturbed surface soil would not be unexpected. This is in the range of the Brunner Creek forest and pasture maximum undisturbed surface soil sample data in Table 1 but is lower than the maximum concentration observed in the marsh samples (up to 1.3 pCi/g) and sediment sample (up to 0.9 pCilg). It is also lower than the undisturbed soil data 95% confidence level for Luzerne County PA in Figure 10 of 1.3 pCi/g for 0 - 10 cm of undisturbed non-drainage area samples. Although the Hosah Park data set fits well within the expected soil concentration from fallout Cs-137 from the residential soils [3]and the Brunner Creek [6] data, undisturbed forested soils could be expected to have 0 - 15 cm average concentration of I to 2 pCi/g and drainage areas could have concentrations of 3 to 6 pCi/g as seen in Figure 10.

The Zion Background reference area study [8] consisted of a description of the survey activities performed and their results in order to assess the levels of natural radioactivity within the environment and building materials at the Zion Nuclear Power Station. The materials of concern were asphalt, concrete and soil. The focus included the unconditional release and potential re-use of concrete and soils originating at the Zion Nuclear Power Station as backfill materials. The soil Cs-I137 sample data from the study was examined for this TSD. The study focused on areas north and northwest of the Zion Unit 1 and 2 plant area as shown in Figure

18. The Cs-137 sample surface (SSS) and subsurface (SSB) results are summarized in Table 3.

Table 3 - Energy Solutions Background Reference Stud, Soil samp*le Results Cs-I137 Result Sample Positive Study Sample pCilg Type ID ES Ref Z-BKG-SOIL-DP-01 1.54E-02 SSB NO ES Ref Z-BKG-SOIL-DP-02

-1.23E-02 SSB NO ES Ref Z-BKG-SOIL-DP-03

-6.58E-03 SSB NO ES Ref Z-BKG-SOIL-DP-04 9.48E-03 SSB NO ES Ref Z-BKG-SOIL-DP-05

-3.47E-02 SSB NO ES Ref Z-BKG-SOIL-DP-06 4.71E-03 SSB NO ES Ref Z-BKG-SOIL-DP-07

-2.80E-03 SSB NO ES Ref Z-BKG-SOIL-DP-08 1.46E-02 SSB NO ES Ref Z-BKG-SOIL-DP-09

-1.48E-02 SSB NO ES Ref Z-BKG-SOIL-DP-1O

-1.83E-02 SSB NO ES Ref Z-BKG-SOIL-DP-11

-4.04E-03 SSB NO ES Ref Z-BKG-SOIL-DP-12

-8.59E-03 S5B NO ES Ref Z-BKG-SOIL-DP-13 1.10E-02 SSB NO ES Ref Z-BKG-SOIL-DP-14 3.91E-02 SSB NO ES Ref Z-BKG-SOIL-DP-15

-2.14E-02 SSB NO ES Ref Z-BKG-SOIL-SF-01 1.05E-02 SSS NO

EH&S TSD # 13-004 Revision 00 Page 21 of 38 Cs-I137 Result Sample Positive Study Sample pCilg Type ID ES Ref Z-BKG-SOIL-SF-02

-8.53E-03 SSS NO ES Ref Z-BKG-SOIL-SF-03

-2.82E-02 SSS NO ES Ref Z-BKG-SOIL-SF-04

-1.27E-02 SSS NO ES Ref Z-BKG-SOIL-SF-05 6.60E-02 SSS YES ES Ref Z-BKG-SOII.-SF-06 1.84E-03 SSS NO ES Ref Z-BKG-SOIL-SF-07

-9.25E-03 SSS NO ES Ref Z-BKG-SOIL-SF-08 1.17E-02 SSS NO ES Ref Z-BKG-SOIL-SF-09

-6.62E-03 SSS NO ES Ref Z-BKG-SOIL-SF-1O 2.49E-02 SSS NO ES Ref Z-BKG-SOIL-SF-11 5.31E-03 SSS NO ES Ref Z-BKG-SOIL-SF-12 9.79E-03 SSS NO ES Ref Z-BKG-SOIL-SF-13 2.93E-02 SSS NO ES Ref Z-BKG-SOIL-SF-14 1.13E-02 SSS NO ES Ref Z-BKG-SOIL-SF-15 3.82E-03 SSS NO oil Location Marked in Blue)

EH&S TSD # 13-004 Revision 00 Page 22 of 38 The frequency plot Figure 19 of the Table 3 data for the Energy Solutions reference background study [8] indicates several background Cs-i137 distributions that are an order of magnitude lower than the Hosah Park data in Figure 15, Figure 16, and Figure 17. This indicates that the sample area was highly disturbed soil with much lower overall Cs-I137 concentrations from fallout.

Frequency Plot All ES Reference Study Cs-137 Soil Results Frequency 7.00 6.00[

5.00I 4.00I 3.001 2.00 1*

1.00I 0.00 L

-4.00 -02

-2.O0E-02 0.OOE+00 2.00E-02 4.O0E-02 6.00E-02 8.00E-02

-1.00 Figure 19-Frequency Plot of All Energy Solution Reference Background Study Soil Cs-137 Results It is not surprising that the Energy Solutions Reference Area has lower overall Cs-I137 concentrations than the Hosah Park data given the sampling locations proximity to site structures and roads.

The Hosah Park and Energy Solutions sample data is representative of well drained disturbed and undisturbed soils adjacent to the Lake. As noted in the residential area and Brunner Creek soil study results, these locations are not necessarily indicative of the Cs-i137 levels that would be expected in drainage areas, wetlands, or undisturbed forest areas of the Zion Station property where characterization measurements will be conducted.

Extensive soil sampling has also been conducted to date in ISFSI impacted MARSSIM Class 3 areas and adjacent ISFSI in survey units 10218, 10219, 10220, 10221. Results from these additional study areas and the Hosah Park and Energy Solutions Reference Background Study are provided in Attachment B and comprise a Zion Facility on-site sample set of 635 surface (0-15 cm) and subsurface (30-45 cm) soil sample results.

EH&S TSD # 13-004 Revision 00 Page 23 of 38 irough 3 Survey Units Showing ISFSI Area 10218 and Adjacent Survey Units The overall sample results range from a non-detect of -9.86E-3 pCi/g for sample L3I0218CJGSSB-C003 from Survey Unit 10218 to 1.14 pCi/g for sample L310220CIGSSSC017 of Bull Creek sediment in survey Unit 10220. It should be noted that this is within the range of the Cs-I137 anticipated fallout levels in the 40 to 50 degrees north latitude region based upon the residential soil [3] Figure 10 and decay corrected Brunner Creek [6] data Table 1.

As seen in Figure 21 the 635 sample data set is heavily weighted to results at the lower end of the spectrum which is indicative of non-detected sample results or very low results that correspond to undisturbed subsurface soils or highly disturbed surface and subsurface soils. Of the 635 sample results 177 had detectable Cs-I137 concentrations that exceeded both the MDA and 2 sigma error associated with the measurement. The frequency plot of the positive identification results is provided as Figure 22.

EH&S TSD # 13-004 Revision 00 Page 24 of 38 Frequency Plot of All Soil Sample Cs-137 Results pCi/g 500 200

• Unisturbed--4-Freqbe nl-y Un¢ DisturbedSufe n Subsurfc H*~

• w Disturbed Surface an Fiur2

- FeUencyiPlture oufa AlU65Solaplis-I37re suDltsal 50 Freqenc AlF Postiv IDSoi 40 Some Undisturbed 35 buru&

30

'Disturbe Surface and 30 Subsurface 25 20 h% ~Undisturbed Surf-_ce 15 Non*-Draina 10

• .Undisturbed Draina e s

• and Marsh 0.0+00 2.00E-01 4.O0E-01 6.00E-01 8.00E-01 1.00E+00 1.20E+00 1.40E+00

-5 Figure 22 - Frequency Plot of 177 Soils Samples with Positive Identification of Cs-I137 Most undisturbed subsurface soil has undetectable levels of Cs-i137 at the 30 to 45 cm depth.

As seen in Figure 22 the bulk of the soil sample results to date are indicative of disturbed soils

EH&S TSD # 13-004 Revision 00 Page 25 of 38 since most areas sampled are in the vicinity of the facility rather than at remote locations on the property. Some data indicates that the results are from undisturbed soils in the 0.2 to I pCi/g range indicative of non-drainage soils similar to the Hosah Park data shown in Figure 16. As seen in Figure 23 the bias created by a preponderance of data lacking positive Cs-i137 identification and with disturbed soil results artificially weights the data set to levels that are well below the 95% confidence levels reported in residential soils (Figure 7, Figure 8, Figure 9, Figure 10) and the range of Cs-I137 concentrations observed in surface samples in the environment such as those from Brunner Creek Table 1.

All Cs-I157 Data, F~Ip~cal Fit

-I-I 0.36 0.32-0.26 0.24 -

0.20 -

0.12 0.06-

.0.1 0.0 95%

(x = 0.27) 99o%

(X = 0.5) 0,4 0.5 0.6 1.1 1.2 0.1 0.2 0.3 0.7 0.6 0.9 1.0 Figure 23 - Empirical Fit of All Soil Sample Data Surface and Subsurface Using Model Risk Software Given the lack of Zion Solutions sample results from undisturbed drainage and non-drainage areas and that all sample data to date aligns well with observed fallout Cs-i137 background concentrations, the decay corrected 0-10 cm 95% confidence values for the Luzerne County, PA - Cesium-I137 in Soil Summary Data and Statistics Disturbed and Undisturbed Soils in Figure 10 can be used to identify Cs-i 37 concentrations that are outside the range of fallout background. As noted in the text below Figure 5, the residential soil study data [3] was decay corrected to 1991. The Figure 10 values were decay corrected for 22.4 years of decay from January 1, 1991 to June 1, 2013. The upper bound of the decay corrected 95% confidence Cs-i 37 concentrations are shown in the last column of Table 5 - Decay Corrected Luzerne County PA Summary Data for Disturbed and Undisturbed Soils at 0 - 10 cm.

EH&S TSD # 13-004 Revision 00 Page 26 of 38 Table 4 - Original Luzerne County PA Summary Data for Disturbed and Undisturbed Soils at 0 -

10 cm Table 5 - Decay Corrected Luzerne County PA Summary Data for Disturbed and Undisturbed Soils at0 -l10cm Decay Corrected Data Condition Number T

Arithmetic Geometric Range (pCiig)

& Depth of Measured Mean (pCi/g) +/-

Mean for 95% of (cm)

Samples Range pCi/g j (1 sigma) j (pCi/g)

Distribution

__________Drainage Areas Surface 0-10 cm Undisturbed 6

0

-2.80 1.43

+

0.83 1.25 0.45 3.63 Disturbed 4

0 1.67 {2.32

+

0.48 j 1.01 0.35

-_ 2.86 Non-Drainage Areas Surface 0-10 cm Undisturbed 6

0.23

-0.66 0.36

+/-

0.15 0.34 0.15 0.77 Disturbed 2

0.27

-0.34 0.30

+/-

0.05 j 0.30 0.23

-0.42 The decay corrected upper 95% value of the distribution in Table 5 can be used to identify Cs-137 concentrations that are outside the range of expected soil concentrations due to world-wide fallout.

6.0 Conclusion The soil sample data indicates that the majority of the Class 3 area soil samples are from disturbed soils. The Hosah Park data [7] and overall sample data fit well with fallout levels predicted using the decay corrected Brunner Creek [6] study data and the decay corrected residential soils study of background levels in New York, Massachusetts, and Pennsylvania

[3]. Given this the Table 5 - Decay Corrected Luzerne County PA Summary Data for Disturbed and Undisturbed Soils at 0 - 10 cm upper 95 th percentile levels for drainage and non-drainage, disturbed and undisturbed soil Cs-i137 levels should be used as investigation levels for non-impacted, and Class 2 and 3 land area survey units. The investigation levels should be specified in the Survey Plan, Survey Package or Work Plan.

7.0 Attachments

EH&S TSD # 13-004 Revision 00 Page 27 of 38 7.1 Attachment A - Zion Site Layout with Future ISFSI Location 7.2 Attachment B - All Soil Sample Results Background Studies and Class 3 Southwest Survey Units 8.0 References

[1]

"DTBD-06-003, Revision No. 0, Use of In Situ Gamma Spectroscopy for Final Site Survey, Rancho Seco Nuclear Generating Station Decommissioning Technical Basis Document, May 26, 2006".

[2]

"Historical Overview of Atmospheric Nuclear Weapons Testing and Estimates of Fallout In the Continental United States, Harold L. Beck and Burton G. Bennett, Health Physics, Vol. 82, No. 5, May 2002.".

[3]

"Investigations of Natural Variations of C3esium137 Concentrations In Residential Soils, Prepared for the Health Physics Society 39th Annual Meeting Student III -

Environmental and Radon Session June 28, 1994".

[4]

"Tracking the Fukushima Radionuclides, Naohiro Yoshida and Jota Kanda, Science 336, 1115 (2012); June 1, 2012".

[5]

"UNSC3EAR 2000 Report Vol. I, Sources and Effects of Ionizing Radiation, Annex C3, Exposures to the public from man-made sources of radiation, 2000.".

[6]

"Redistribution of Fallout 137C3s In Brunner Creek Watershed In Wisconsin, Jerry C3.

Ritchie, J. Roger McHenry, and Gary D. Bubenzer USDA-ARS, Beltsville, MD, and Durant, OK and the University of Wisconsin-Madison, WI, 1982".

[7]

"Determination of Radionuclide Activity Concentrations In Soils In Non-Impacted Soils Adjacent to the Zion Nuclear Station, July 26, 2012".

[8]

"CS-RS-PN-028, Revision 0, Background Reference Area Report Zion Nuclear Power Station Zion, I, February 7, 2012".

Attachment A Zion Site Layout with Future ISFSI Location EH&S TSD # 13-004 Revision 00 Page 28 of 38

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 29 of 38 Cs-137 Result pCi/g Cs-137 Result pOi/g Mosan L'4bKbUlbJbbbRU1

-i.blL-UJ*

S5S PlU Hosan L4IBKLUIBJ(,St5AUb 4.blE-03*

55B NO Hosah L4BKG01QJGSSSA01 2.49E-02 SSS NO Hosah L4BKG01BJGSBSA07 5.09E-03 SSB NO Hosah L4BKG01BJGSSSA02 1.37E-01 SSS YES Hosah L4BKG01BJGSBSA08

-6.13E-03 SSB NO Hosah L4BKG01BJGSSSA03 8.32E-02 SSS YES Hosah L4BKG01BJGSBSA09

-3.70E-03 556 NO Hosah L4BKG01BJGSSSA04 1.23E-01 SSS YES Hosah L4BKGOIBJG5BSA10

-2.22E-02 SSB NO Hosah L4BKGO1BJGSSSA05 1.72E-01 SSS YES Hosah L4BKG01BJGSBSA11 1.10E-02 SSB NO Hosah L4BKG01BJGSSSA06 4.97E-01 SSS YES Hosah L4BKG01BJGSBSA12 1.32E-02 SSB NO Hosah L4BKG01BJGSSSA07 3.34E-01 5S5 YES Hosah L4BKG01BJGSBSA13 1.13E-02 SSB NO Hosah L4BKG01BJGSSSA08 1.22E-02 SSS NO Hosah L4BKG01BJGSBSA14 9.30E-03 SSB NO Hosah L4BKGO1BJGSSSA09 2.66E-01 SSS YES Hosah L4BKGOIBJGSBSA15

-2,27E-03 SSB NO Hosah L4BKG01BJGSSSA10 1.94E-01 SSS YES Hosah L4BKG01BJGSBSA16 1.05E-01 SSB YES Hosah L4BKG01BJGSSSA11 1.51E-01 555 YES Hosah L4BKGO1CJGSBSA16

-6.13E-03 SSB NO Hosah L4BKG01BJGSSSA12 3.12E-01 555 YES Hosah L4BKG01BJGSBSA17 4.03E-02 SSB YES Hosah L4BKG01BJGSSSA13 3.17E-01 555 YES Hosah L4BKG01BJGSBSA18

-6.63E-03 SSB NO Hosah L4BKG01BJGSSSA14 1.05E-02 SSS NO Hosah L4BKGOIBJGSBSA19 5.66E-03 SSB NO Hosah L4BKG01BJGSSSA15 2.80E-01 555 YES Hosah L4BKG01BJG5BSA20

-4.67E-03 556 NO Hosah L4BKG01BJGSSSA16 2.18E-01 SSS YES Hosah L4BKG01BJGSBSA21 1.26E-03 SSB NO Hosah L4BKG01CUJGSSSA16 7.57E-03 555 NO Hosah L4BKGOiBJGSBSA22 4.81E-03 55B NO Hosah L4BKG01QJGSSSA17 2.52E-01 555 YES Hosah L4BKGOiBJGSBSA23 2.14E-01 556 YES Hosah L4BKG01OJGSSSA18 8,86E-02 555 NO Hosah L4BKGOiBJGSBSA24 1.62E-02 SSB NO Hosah L4BKG01WJGSSSA19 8.06E-02 555 YES Hosah L4BKGOiBJGSBSA2S 1,17E-03 SSB NO Hosah L4BKGO1WJGSSSA20 4.02E-01 555 YES Hosah L4BKGOiBJGSBSA26

-1.54E-02 SSB NO Hosah L4BKG01QJGSSSA21 6.51E-01 S55 YES Hosah L4BKGOiBJGSBSA27 1.07E-01 SSB YES Hosah L4BKG01BJGSSSA22 2.53E-01 555 YES Hosah L4BKG01BJGSBSA28 2.41E-01 SSB YES Hosah L4BKG01BJGSSSA23 2.25E-01 555 YES Hosah L4BKG01BJGSBSA29 4.50E-02 556 NO Hosah L4BKG01BJGSSSA24

-7.93E-03 SSS NO Hosah L4BKGOiBJGSBSA30 1.61E-02 556 NO Hasah L4BKG01BJGSSSA25 2.89E-01 SSS YES Hasah L4BKG01BJGSBSA02 1.59E-02 SSB NO Hosah L4BKG01BJGSSSA26 2.01E-01 SSS YES Hosah L4BKG01BJGSBSA03

-1.20E-02 556 NO Hosah L4BKG01BJGSSSA27 2.27E-01 SSS YES Hosah L4BKG01BJGSBSA04 1.94E-O2 SSB NO Hosah L4BKG01BIGSSSA28 2.41E-01 SSS YES Hosah L4BKG01BJGSBSA05

-6.27E-03 SSB NO Hosah L4BKG01BJGSSSA29 2.77E-01 SSS YES ES Ref Z-BKG-SOIL-DP-01 1.54E-02 55B NO Hosah L4BKG01BJGSSSA30 2,60E-01 SSS YES ES Ref Z-BKG-SOIL-DP-02

-1.23E-02 556 NO Hosah L4BKG01BJGSBSA01 1.98E-02 SSB NO ES Ref Z-BKG-SOIL-DP-03

-6.58E-03 556 NO Hosah L4BKG01OJGSBSA01 2.19E-02 SSB NO ES Ref Z-BKG-SOIL-DP-04 9.48E-03 SSB NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 30 of 38 Cs-237 Result pCi/g

-3.47E-02 Cs-137 Result pCi/g 2.97E-02 t

eT

/IIt-*

I-VU NO 1*1"31 VLL-3Y T}IM--Ui.L-I.

I I

4

+

4-ES Ref IZ-BKG-SOIL-DP-06 4.71E-03 I SSB NO ISFSI IVCC-SYST-A019-SS 3.17E-03 NO ES Ref Z-BKG-SOIL-DP-07

-2.80E-03 SSB NO ISFSI VCC-SYST-A020-SS 3.24E-03 SSB NO ES Ref Z-BKG-SOIL-DP-08 1.46E-02 SSB NO ISFS1 VCC-SYST-A021-SS 1.13E-02 SSB NO ES Ref Z-BKG-SOIL-DP-09

-1.48E-02 SSB NO ISFS1 VCC-SYST-A022-SS 3.22E-02 SSB NO ES Ref Z-BKG-SOIL-DP-10

-1.83E-02 SSB NO ISFS1 VCC-SYST-A023-SS 1.68E-02 SSB NO ES Ref Z-BKG-SOIL-DP-11

-4.04E-03 SSB NO ISFS1 VCC-SYST-A024-SS 2.57E-02 SSB YES ES Ref Z-BKG-SOIL-DP-12

-8.59E-03 SSB NO ISFS1 VCC-SYST-A025-SS 2.36E-03 SSB NO ES Ref Z-BKG-SOIL-DP-14 3.91E-02 SSB NO ISFS1 L310218CSGSSB-A001 3.08E-02 SSB YES ES Ref Z-BKG-SOIL-DP-15

-2.14E-02 SSB NO ISFS1 L310218CSGSSB-A002 4.62E-03 SSB NO ES Ref Z-BKG-SOIL-SF-01 1.05E-02 555 NO ISFS1 L310218CSGSSB-A003

-3.07E-03 SSB NO ES Ref Z-BKG-SOIL-SF-02

-8.53E-03 SSS NO lSFSI L310218CSGSSB-A004 7.96E-02 SSB YES ES Ref Z-BKG-SOIL-SF-03

-2.82E-02 SSS NO ISFS1 L310218CSGSSB-A005 3.23E-02 SSB YES ES Ref Z-BKG-SOIL-SF-04

-1.27E-02 SSS NO ISFS1 L310218CSGSSB-AO06 3.41E-03 SSB NO ES Ref Z-BKG-SOIL-SF-05 6.60E-02 SSS YES ISFS1 L310218CSGSSB-A007 2.75E-04 SSB NO ES Ref Z-BKG-SOIL-SF-06 1.84E-03 SSS NO ISFS1 L310218CSGSSB-A008 1.57E-02 SSB NO ES Ref Z-BKG-SOIL-SF-07

-9.25E-03 SSS NO ISFSI L310218CSGSSB-BO05

-2.25E-03 SSB NO ES Ref Z-BKG-SOIL-SF-08 1.17E-02 SSS NO ISFSI L310218CSGSSB-B006 8.73E-04 SSB NO ES Ref Z-BKG-SOIL-SF-09

-6.62E-03 SSS NO ISFSt L310218CSGSSB-B002 1.62E-03 SSB NO ES Ref Z-BKG-SOIL-SF-10 1.49E-02 55S NO ISFSI L310218CSGSSB-B003 1.82E-02 SSB NO ES Ref Z-BKG-SOIL-SF-11 5.31E-03 SSS NO ISFSI L310218CSGSSB-B007 3.12E-02 SSB YES ES Ref Z-BKG-SOlL-SF-12 9.79E-03 SSS NO ISFSI L310218CSGSSB-B001 6.95E-02 SSB YES ES Ref Z-BKG-SOIL-SF-13 2.93E-02 555 NO ISFSI L310218CSGSSB-B004 7.37E-02 SSB YES ES Ref Z-BKG-SOIL-SF-14 1.13E-02 SSS NO ISFS1 L310218CSGSSB-B025 3.00E-02 SSB YES ES Ref Z-BKG-SOIL-SF-15 3.82E-03 SSS NO ISF51 L310218CSGSSB-B026

-6.86E-03 SSB NO ISFSI L310218CSGSSB-B009 6.54E-02 SSB YES ISFS1 L310218CSGSSB-B027 3.39E-02 SSB YES ISFSI L310218CSGSSB-B010

-6,20E-03 SSB NO ISFS1 L310218CSGSSB-B029

-8.91E-03 SSB NO ISFSI L310218CSGSSB-B011

-1.26E-02 SSB NO ISFSI L310218CSGSSB-B030

-9.28E-03 SSB NO ISFSI L310218CDGSSB-B011 1.33E-02 SSB NO ISF51 L310218CSGSSB-A017 5.64E-02 SSB YES ISFS1 L310218CSGSSB-B012

-8.03E-03 SSB NO ISFSI L310218CSGSSB-A018

-4,20E-03 SSB NO ISFS1 L310218CSGSSB-B013 1.18E-02 SSB NO ISFS1 L310218CSGSSB-A019 2.00E-02 SSB NO ISFSI L310218CSGSSB-B014 6.28E-02 SSB YES ISFS1 L310218CDGSSB-A019 6.95E-03 SSB NO ISFSl 1310218CSGSSB-B015 2.61E-04 SSB NO ISF51 L310218CSGSSB-A020 4,87E-02 SSB YES ISFSI L310218CSGSSB-B016 1.78E-02 SSB NO ISFSI L310218CSGSSB-A021 3.64E-03 SSB NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 31 of 38 SCs-137 Result pCi/g 1.85E-02 3.12E-02 Cs-137 Result pCi/g 5.07E-03 SSB NO ISFSI I

4 Li1U~l+/-bLbbb-MULL 8.69E-03 SB NO ISFSI I L310218CSGSSB-B017 6.30E-03 I SSB NO ISFSI VCC-SYST-A011-SS 1.53E-02 ISSB NO ISFSI 1.310218CSGSSB-B018 2.98E-02 SSB YES ISFS1 VCC-SYST-A009-SS 2.11E-02 SSB NO ISFSI L310218CSGSSB-B019 9.49E-03 SSB NO ISFSI VCC-SYST-A016-SS 2.44E-02 SSB NO ISF51 L310218CSGSSB-B021 3.10E-02 SSB NO ISFSI VCC-SYST-A014-SS 2.70E-02 SSB NO ISF51 L31O218CSGSSB-B022 2.27E-02 SSB NO tSFSl VCC-SYST-A010-SS 5.61E-02 SSB YES ISFSI L310218CSGSSB-B023 7,67E-02 SSB YES ISFSI VCC-SYST-A017-SS

-1.25E-02 SSB NO ISFSl L310218CSGSSB-A025 1,92E-02 SSB NO ISF51 L310218CJGSSB-C004

-9.11E-04 SSB NO ISFSl L310218CSGSSB-A026

-5.51E-03 SSB NO ISFS1 L310218CJGSSB-C005 8.91E-04 SSB NO ISFSl L310218CSGSSB-A010

-3.35E-03 SSB NO ISF51 L310218CJGSSB-C004 2.34E-03 SSB NO ISF51 1.310218CSGSSB-A030 1.45E-03 SSB NO ISF51 VCC-SYST-A008-SS 1.10E-02 SSB NO ISFS1 L310218CSGSSB-A026 4.85E-03 SSB NO ISF51 VCC-SYST-A027-SS 1.72E-02 SSB NO ISFSI L310218CSGSSB-A012 5.43E-03 SSB NO ISFSl VCC-SYST-A026-SS 3.07E-02 SSB YES ISFSI L310218CSGSSB-A028 1.43E-02 SSB NO ISFSI L310218CJGSSB-C006 3.16E-02 SSB YES ISFSI L310218CSGSSB-A011 1.45E-02 SSB NO ISFSI VCC-SYST-A029-SS

-1.56E-02 SSB NO lSFSl L31O218CSGSSB-A027 1.52E-02 SSB NO ISFSI VCC-SPL1-A029-SS 8.50E-04 SSB NO ISFSI L310218CSGSSB-A013 5.42E-02 SSB YES ISFSI VCC-SYST-A030-SS 5.20E-03 SSB NO ISFSI L310218CSGSSB-A009 6.95E-02 SSB YES ISFSI 1310218CDGSSB-B024

-2.51E-02 SSB NO ISFSI L310218CJGSSB-C002

-8.38E-03 SSB NO ISFS1 L310218CSGSSB-B024

-1.40E-02 SSB NO ISFS1 L310218CJGSSB-C001 2.77E-03 SSB NO ISF51 L310218CSGSSB-B008

-5.84E-03 SSB NO ISF51 1.310218CJGSSB-C003 9.86E-03 SSB YES ISFS1 L310218CSGSSB-A029 4.55E-03 SSB NO ISF51 L310218CSGSSB-A014 1.96E-02 SSB NO ISFSI L310218CSGSSB-B020 8.35E-03 SSB NO ISFSI L310218CSGSSB-A015 2.93E-02 SSB YES ISFSI L310218CSGSSB-A023 1.94E-02 SSB NO ISFSI L310218CSGSSB-A016 5.55E-02 SSB YES ISF51 L31021811GSSB-A003 1.99E-02 SSB NO ISFSI VCC-SYST-A007-SS

-7.48E-03 556 NO ISF51 L310218CSGSSB-B028 2.56E-02 SSB NO ISFS1 VCC-SYST-A005-SS

-1.62E-03 556 NO ISFS1 L310218CSGSSS-B009 9.23E-02 SSS YES ISFSI VCC-SYST-A004-SS 4.89E-03 SSB NO ISFS1 L310218CSGSSS-B009 3.38E-02 SSS YES ISFSI VCC-SYST-A001-SS 3.12E-02 SSB YES ISF51 L310218CSGSSS-B010 2.14E-02 SSS NO ISF51 VCC-SYST-A003-SS 3.49E-02 SSB YES ISFS1 L310218CSGSSS-B011 7.77E-02 SSS YES ISFSI VCC-SYST-A006-SS 5.03E-02 SSB YES ISFSI L310218CSGSSS-BO12 3.45E-03 SSS NO ISFSI VCC-SPL1-A002-SS 6.27E-02 SSB YES ISFSI L310218CSGSSS-B013 5.17E-02 SSS YES ISFSI VCC-SYST-A002-SS 8.45E-02 SSB YES ISFSI L310218CSGSSS-B014 8.05E-02 SSS YES ISFSI VCC-SYST-A013-SS 2.60E-03 SSB NO ISF51 L310218CSGSSS-B015

-7.03E-03 SSS NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 32 of 38 Cs-137 Result pui/g 7.00E-02 Cs-137 Result pI/g-l I 1.37E-02 8.06E-03 I*I-*I J L5 J.UZ 3.*b* bbb-I*U JLb ISFSI IVCC-SYST-A018-SF 8.51E-03 SSS NO I SFSI L310218CDGSSS-B030 I11li NO ISFSI VCC-SYST-A018-SF 1.73E-02 SSS NO ISFSI L310218CSGSSS-A017 2.73E-02 SSS YES ISFS1 VCC-SYST-A019-SF 7.32E-03 SSS NO ISFSI L310218CSGSSS-A017 4.57E-02 SSS YES ISFS1 VCC-SYST-A020-SF 2.86E-02 SSS NO ISFSI L31021SCSGSSS-A018 3.04E-02 SSS NO ISFSI VCC-SYST-AO21-SF 1.77E-02 SSS NO tSFSI L310218CSGSSS-A019

-6.53E-04 SSS NO ISFSl VCC-SYST-A022-SF 1.80E-02 SSS NO ISFS1 L310218CSGSSS-A020 1.06E-02 SSS NO ISFSI VCC-SYST-A023-SF

-7.90E-03 SSS NO ISFS1 L310218CSGSSS-A021 7.83E-02 SSS YES ISF51 VCC-SYST-AO24-SF 3.32E-02 SSS YES ISFS1 L310218CSGSSS-A022 2.02E-02 SSS NO ISFS1 VCC-SYST-A025-SF

-2.95E-03 SSS NO ISFSI L310218CDGSSS-A022 1.17E-02 SSS NO ISFS1 L31O218CSGSSS-A001 2.59E-02 SSS YES ISFSI L310218CSGSSS-B017 8.02E-02 SSS YES ISFSI L310218CSGSSS-A001 2.05E-02 SSS NO ISFSI L310218CSGSSS-B017 8.41E-02 SSS YES ISFSI L310218CSGSSS-A002 5.86E-02 SSS YES ISFSI L310218CSGSSS-B018 1.16E-02 SSS NO lSFSl L310218CSGSSS-A003 1.90E-02 SSS NO ISFS1 1310218CSGSSS-B019 5.19E-02 SSS YES ISFSI L310218CDGSSS-A003 4.64E-02 SSS YES ISFS1 L310218CSGSSS-B021 2.34E-02 SSS NO ISFSI L31021SCSGSSS-A004 4.14E-02 555 YES ISFS1 L310218CSGSSS-B022 4.35E-03 SSS NO ISFSI L310218CSGSSS-A005 3.65E-02 SSS NO ISFSI L310218CSGSSS-B023 2.55E-03 SSS NO ISFS1 L310218CSGSSS-A006 3.60E-02 SSS YES ISFSI L310218CSGSSS-A024 5.52E-02 SSS YES ISF51 L310218CSGSSS-A007 8.25E-03 SSS NO ISFSI L310218CSGSSS-A025 2.86E-03 SSS NO ISFSI 1.310218CSGSSS-A008 9.34E-03 SSS NO tSFSI L310218CSGSSS-A026

-7.86E-04 SSS NO ISFS1 L310218CSGSSS-B005 1.74E-02 SSS NO ISFS1 L310218CSGSSS-A028

-8.44E-03 SSS NO ISFSI L310218CSGSSS-B001 3.12E-02 SSS NO ISFS1 L310218CSGSSS-A012

-3.57E-03 SSS NO ISFSI L310218CSGSSS-B001 3.25E-02 SSS YES ISFSI L310218CSGSSS-A011 1.07E-03 SSS NO ISFSI L310218CSGSSS-B006 5.27E-02 SSS YES ISFSI L310218CSGSSS-A010 1.19E-02 SSS NO ISF51 L310218CDGSSS-B002 7.13E-02 SSS YES ISFSI L310218CSGSSS-A009 1.49E-02 SSS NO ISFSI L310218CSGSSS-B007 8.19E-02 SSS YES ISFSI L310218CSGSSS-A030 2.18E-02 SSS YES ISFSI L310218CSGSSS-B002 9.08E-02 SSS YES ISFSI L310218CSGSSS-A027 3.43E-02 SSS YES ISFSI L310218CSGSSS-B004 1.17E-01 SSS YES ISF51 L310218CSGSSS-A013 4.13E-02 SSS YES ISFSI L310218CSGSSS-B003 3.07E-01 SSS YES ISFS1 L310218CJGSSS-C003

-5.62E-03 SSS NO ISFSI L310218CSGSSS-B025

-6.81E-04 SSS NO ISFSI L310218CJGSSS-C001 2.72E-04 SSS NO ISFSI L310218CSGSSS-B025

-3.60E-03 SSS NO ISFSI L310218CJGSSS-C002 2.61E-03 SSS NO ISFSI L310218CSGSSS-B026 1.34E-03 SSS NO ISFS1 L310218CSGSSS-A016 1.97E-02 SSS NO ISFSI L310218CSGSSS-B027

-8.50E-04 SSS NO ISFSI L310218CJGSSS-CO04 2.22E-02 SSS YES ISFSI L310218CSGSSS-B029 2.91E-02 SSS YES ISFS1 L310218CSGSSS-A014 2.64E-02 SSS NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 33 of 38 Cs-137 Result pCi/g 2.88E-02 Cs-137 Result pCi/g 2.97E-02 SsS YES ISFSI L310218CSGSSS-A014 3.16E-02 3.56E-02 SSS NO ISFSI VCC-SYST-A004-SF

-2.80E-02 SSS NO ISFSI L310218CSGSSS-B020 4.10E-02 SSS YES ISFSI VCC-SYST-A006-SF

-2.21E-03 SSS NO ISFSI L310218CSGSSS-B028 4.65E-02 SSS YES ISFSI VCC-SYST-A007-SF 2.20E-04 SSS NO ISFS1 L31021811GSSS-A002 1.09E-01 SSS YES ISFSI VCC-SYST-A002-SF 2.12E-03 SSS NO ISFSI L31021811GSSS-AO01 1.16E-01 SSS YES ISF51 VCC-SYST-A005-SF 3.38E-03 SSS NO SW L310220CJGSSSB001 2.74E-01 SSB YES ISFSI VCC-SYST-A001-SF 9,04E-03 SSS NO SW L310220CJGSSSB002 1.02E-01 SSB YES ISFSI VCC-SYST-A003-SF 1.41E-02 SSS NO SW L310220CJGSSSB003 1.30E-O1 SSB YES ISFSI VCC-SPL1-A002-SF 2.43E-02 SSS NO SW L310220CJGSSSB004 3.18E-02 SSS NO ISFSl VCC-SYST-A001-SF 2.85E-02 S55 YES SW 1310220CJGSSSBO05 6.57E-02 SSB NO ISFSl VCC-SYST-A008-SF 1.28E-01 SSS YES SW L310220CJGSSSB006 6.84E-02 SSB NO ISFSI VCC-SYST-A017-SF

-8.30E-03 SSS NO SW L310220CJGSSSBO07 3.37E-02 SSB NO ISF51 VCC-SYST-A014-SF

-5.49E-03 SSS NO SW L310220CJGSSSBO08 7.69E-02 SSB NO lSFSl VCC-SYST-A012-SF

-3.74E-03 SSS NO SW L310220CO.GSSSB008 6.77E-02 SSB YES ISFSI VCC-SYST-A010-SF 1.35E-03 SSS NO SW L310220CJGSSBB001 5.81E-02 SSB NO lSFSI VCC-SYST-A011-SF 6.64E-03 555 NO SW L310220CJGSSBB002 1.13E-01 SS8 YES lSFSI VCC-SYST-A016-SF 7.89E-03 SSS NO SW L310220CJGSSBB003 4.09E-02 SSS NO ISFSI VCC-SYST-A015-SF 1.10E-02 SSS NO SW L310220CJGSSBB004 1.24E-01 SSS YES ISFS1 VCC-SYST-A009-SF 1.66E-02 SSS NO SW L310220CIGSSBB005

-8.06E-04 SSB NO ISFSI VCC-SYST-A009-SF 2.08E-02 SSS NO SW L310220CJGSSBBO06 9.77E-03 SSS NO ISFSI VCC-SYST-A013-SF 5.91E-02 SSS YES SW L310220CJGSSBB007 4.08E-O2 SSB NO ISFSI VCC-SYST-A027-SF

-6.62E-03 SSS NO SW L310220CJGSSBB008 1.87E-02 SSB NO ISFS1 VCC-SYST-A026-SF

-6.47E-03 SSS NO SW L310220CQGSSBB008 8.98E-03 SSB NO ISFSI L310218CJGSSS-C005

-5.62E-04 555 NO SW L310220CJGSSSA001 3.93E-02 SSS NO ISFSI L31O218CJGSSS-C006 3.19E-03 SSS NO SW L310220CJGSSSA002

-1.32E-02 SSB NO ISFSI VCC-SYST-A028-SF 5.99E-03 SSS NO SW L310220CJGSSSA003 2.54E-02 SSS NO ISFSI VCC-SPL1-A029-SF

-5.77E-03 SSS NO SW 1_310220CJGSSSA004 2.43E-01 SSS YES ISFSI VCC-SYST-A030-SF

-5.41E-03 SSS NO SW L310220CJGSSSA005 1.93E-01 SSB YES ISFSI VCC-SYST-A029-SF 2.89E-04 SSS NO SW L310220CJGSSSA006 4.91E-02 SSS NO ISFSI VCC-SYST-A029-SF 1.25E-02 SSS NO SW L310220CQGSSSA006 5.45E-02 SSS NO ISFSI 1L310218CSGSSS-A023

-4.09E-03 SSS NO SW L310220CJGSSBA001

-2.05E-02 SSB NO ISFSI L310218CSGSSS-A023 8.40E-04 SSS NO SW L310220CJGSSBA002

-1.42E-02 SSS NO ISFSI L310218CSGSSS-A029 1.22E-02 SSS NO SW L310220CJGSSBA003 7.52E-03 SSB NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 34 of 38 SCs-137 Result pCi/g 4.1OE-02 Cs-137 Result pCi/g 2.42E-02 SS NO IW L.1ULLOUUJLIbPUU4.

I I

SW II1A1*2ACICGSSRAOOS 1.10EF-01 SSS5 YES SW L310221CSGSSBA019

-5.81E-03 SB NO SW L310220CJGSSBA006

-2.96E-02 SSB NO SW L310221CSGSSBA020 8.22E-03 SB NO SW L31O22OCQGSSBA006 6.55E-03 SSB NO SW 1310221CSGSSBA021 2.77E-02 55 NO SW L31O220CJGSSSA0O1 3.37E-O1 SSB YES SW L31O221CSGSSBAO22 8.72E-03 SB NO SW L310220CJGSSSA002 1.11E-01 SSB NO SW L310221CSGSSBA023 4.70E-02 SB NO SW L31022OCJGSSSA003 1.79E-O1 SSS YES SW L31O221CSGSSBAO24

-1.31E-02 SB NO SW L31022OCJGSSSAO04 1.20E-O1 SSB YES SW L31O221CSGSSBA025 8.74E-03 SB NO SW L31O220CJGSSSA005 1.09E-01 SSB YES SW L31O221CSGSSBA026 1.43E-02 SB NO SW L31022OCQGSSSA005 1.64E-01 SSB YES SW L31O221CSGSSBAO27 3.46E-03 SB NO SW L31O220CJGSSBAOO1

-1.48E-03 SSB NO SW L31O221CSGSSBAO28 1.69E-02 SB NO SW L31O220CJGSSBAOO2 1.52E-O1 SSB YES SW L31O221CSGSSBAO29 5.33E-03 SS NO SW L31O220CJGSSBA0O3 1.27E-O1 SSS YES SW L31O221CSGSSBA03O

-8.51E-03 SB NO SW 1L31022OCJGSSBAOO4

-1.90E-02 SSS NO SW L310221CQGSSSAO01 8.29E-03 SB NO SW L31022OCJGSSBAOO5 2.42E-02 SSB NO SW L310221CQGSSSA016 1.79E-02 SB NO SW L31O22OCQGSSBAOOS 3.16E-03 SSB NO SW L31O221CSGSSSAOO1 1.88E-02 SS NO SW L31O221CQGSSBAOO1 3.03E-02 SSB NO SW L310221CSGSSSA002

-2.48E-03 SS NO SW L310221CQGSSBAO16 1.30E-02 SSB NO SW L310221CSGSSSA003 5.03E-02 SB NO SW L310221CSGSSBAOO1 6.07E-02 SSB NO SW L31O221CSGSSSAOO4 4.22E-02 SS NO SW L310221CSGSSBA0O2

-5.28E-04 SSS NO SW L31O221CSGSSSAO05 1.14E-02 SS NO SW L310221CSGSSBAO03 4.41E-02 SSS YES SW L310221CSGSSSA006 3.98E-02 SB NO SW L31O221CSGSSBAO04 1.74E-02 SSS NO SW L310221CSGSSSA007 2.79E-02 SB NO SW L31O221CSGSSBAO05 7.05E-03 SSS NO SW L310221CSGSSSA008 1.40E-03 SB NO SW 1310221CSGSSBA006 1.69E-02 SSS NO SW L310221CSGSSSA009 8.1OE-03 SB NO SW 1.310221lCSGSSBA007 7.52E-04 SSS NO SW L31O221CSGSSSAO10 2.07E-02 SS NO SW L310221CSGSSBA008

-8.18E-03 SSB NO SW L31O221CSGSSSAO12 7.35E-03 SB NO SW L310221CSGSSBAO09 2.11E-02 SSB NO SW L310221CSGSSSA012 4.90E-02 SS NO SW L31O221CSGSSBAO12 6.02E-04 SSS NO SW L310221CSGSSSA013 1.15E-O1 SS YES SW L31O221CSGSSBAO12 1.08E-03 SSB NO SW L310221CSGSSSA013 1.29E-O1 SB YES SW L31O221CSGSSBAO13 4.27E-02 SSS NO SW L310221CSGSSSA015 1.94E-02 SB NO SW 1310221CSGSSBA014

-5.21E-03 SSB NO SW L310221CSGSSSA016 2.03E-02 SB NO SW L310221CSGSSBA015

-3.23E-03 SSB NO SW L310221CSGSSSA017 2.57E-02 SS NO SW L31O221CSGSSBAO16 4.90E-03 SSS NO SW L310221CSGSSSA018 5.27E-03 SS NO SW L31O221CSGSSBAO17 6.13E-03 SSB NO SW L310221CSGSSSA019 2.02E-02 SS NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 35 of 38 SCs-137 Result pCi/g 4.15E-02 Cs-137 Result pCi/g 1.19E-01 SSs YES IW Lj+/-UZZL1Lb)b)AULU

-4 I.

4 SW IL310221CSGSSSA021 2.32E-01 SB YES SW 1310220CRGSSSC007 2.35E-01 SB YES SW L310221CSGSSSA021 1.90E-O1 SSS YES SW L310220CRGSSSCO08 3.03E-O1 SSB YES SW L310221CSGSSSA022 9.25E-02 SSS YES SW L310220CRGSSSC012 3.80E-02 SSS NO SW L310221CSGSSSA022 1.17E-01 SSS YES SW L310220CRGSSSC016 1.49E-01 SSS YES SW L310221CSGSSSA023 9.46E-03 SSS NO SW L310220CRGSSSC024 9.97E-02 SSB YES SW L310221CSGSSSA024 2.13E-02 SSS NO SW L310220CRGSSSCO01 1.27E-01 SSS YES SW L310221CSGSSSA025 6.27E-02 SSB NO SW L310220CRGSSSC002 1.45E-02 SSB NO SW L310221CSGSSSA026 S.75E-02 SSS NO SW L310220CRGSSSC003 9.79E-03 SSB NO SW L310221CSGSSSA02 1.83E-02 SSB NO SW L310220CRGSSSCO04 2,78E-01 SSB YES SW L310221CSG5SSA028

-9,88E-04 SSB NO SW L310220CRGSSSC00 2.86E-02 SSS NO SW L310221CSGSSSA029

-2.32E-02 SSS NO SW L310220CRGSSSC006 2.10E-01 SSS YES SW 1310221CSGSSSA030 1.65E-02 SSS NO SW L310220CRGSSSC009 2.63E-02 SSS NO SW 1310220CJGSSS001

-5.55E-03 SSS NO SW L310220CRGSSSC010 8.59E-02 SSS YES SW L310220CJGSSS001 1.13E-02 SSS NO SW L310220CRGSSSC011 2.58E-03 SSB NO SW L310220CJGSSSO02 9.53E-O2 SSS YES SW L310220CRGSSSC013 2.94E-02 SSB NO SW L310220CJGSSSO03 1.13E-O1 SSB YES SW L310220CRGSSSC014 3.O7E-O1 SSB YES SW L310220CJGSSS004 2.41E-01 SSS YES SW L310220CRGSSSC017 1.O5E-O1 SSS YES SW L310220CJGSSS008 3.90E-01 SSS YES SW L310220CRGSSSC018 1.04E-01 SSS YES SW L310220C1GSSSB001 1.37E-02 SSS NO SW 1310220CRGSSSC019 5.00E-01 SSS YES SW L310220C1GSSSB002 1.01E-02 SSB NO SW L310220CRGSSSC021 9.23E-02 SSB NO SW L310220CIGSSBBO01 2.10E-02 SSS NO SW L310220CRGSSSC022 7.28E-O1 SSB YES SW L310220CIGSSBB002 1.99E-02 SSB NO SW L310220CRGSSSC023 1.64E-01 SSS YES SW L310220CIGSSSO10 2.87E-01 SSB YES SW L310220CRGSSSC025 3.25E-03 SSB NO SW L310220C1GSSS011 2.25E-01 SSB YES SW L310220CRGSSSC026 1.19E-02 SSB NO SW L310220C1GSSS012 3.71E-01 SSB YES SW L310220CRGSSSC027 8.20E-02 SSB NO SW L310220ClGSSS013 1.29E-01 SSB YES SW L310220CRGSSSC028 2.80E-01 SSS YES SW 1310220CIGSSS014 2.79E-01 SSB YES SW L310220CRGSSSC029 1.66E-01 SSS YES SW L310220C1GSSSC015 9.03E-01 SSS YES SW L310220CRGSSSC030 5.12E-02 SSS NO SW L310220C1GSSSC016 2.40E-01 SSB YES SW L310220CRGSSSCO31 2.07E-01 SSS YES SW L310220CIGSSSC017 1.14E+00 SSS YES SW L310220CR0SSSC025 1.07E-02 SSB NO SW L310220C1GSSSC018 1.35E-01 SSS YES SW L310220CJGSSSBO01 2.71E-01 SSS YES SW L310220C1GSSSC019 2.90E-01 SSS YES SW L310220CJGSSSB001 2.74E-01 SSS YES SW L310220C1GSSSC020 3.23E-01 SSS NO SW L31022OCJGSSBB001 5.81E-02 SSS NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 36 of 38 SCs-137 Result pCi/g 1,02E-01 Cs-137 Result pCi/g 1.80E-02 4.42E-03

.VW L,51ULLUtJ*3I)tUUL SW IL310220CJGSSBBO02 I1.13E-01 I SSS YES SW L310220CSGSSSB018 NO SW L310220CJGSSSB003 1.30E-01 SSB YES SW L310220CSGSSSB019 5.41E-02 SSB NO SW L31022OCJGSSBB003 4.09E-02 SSS NO SW L310220CSGSSSB020

-2.91E-03 SSB NO SW L31022OCJGSSSB004 3.18E-02 SSS NO SW L310220CSGSSSB021 2.74E-02 SSS NO SW L310220CJGSSBBO04 1.24E-01 SSB YES SW L310220CSGSSSB022 1.66E-03 SSS NO SW L31O220CJGSSSB005 6.57E-02 SSS NO SW L310220CJGSSSA001 3.00E-02 SSS NO SW L310220CJGSSBB005

-8.06E-04 SSS NO SW L310220CJGSSSA001 3.93E-02 SSS NO SW L310220CJGSSSB006 6.84E-02 SSS NO SW L310220CJGSSBA001

-2.05E-02 SSB NO SW L310220CJGSSBBO08 9.77E-03 SSB NO SW L310220CJGSSSA002

-1.32E-02 SSB NO SW L310220CIGSSSB007 3.37E-02 SSB NO SW L310220CJGSSBA002

-1.42E-02 SSB NO SW 1310220CJGSSBB007 4.08E-02 SSS NO SW L310220CJGSSSA006 4.91E-02 SSB NO SW L310220CJGSSSB008 7.69E-02 SSS NO SW L310220CQGSSSA006 5.45E-02 SSS NO SW L310220CQGSSSB008 6.77E-02 SSS YES SW L310220CJGSSBA006

-2.96E-02 SSS NO SW L31O220ClGSSBB001 2.10E-02 SSB NO SW L310220CQGSSBA006 6.55E-03 SSS NO SW 1.310220CIGSSBB002 1.99E-02 SSS NO SW 1310220CJGSSSA003 2.54E-02 SSS NO SW L310220CIGSSSB001 1.37E-02 SSS NO SW L310220CJGSSBAO03 7.52E-03 SSS NO SW L310220CIGSSSB002 1.01E-02 SSS NO SW L310220C1GSSSA004 2.43E-01 SSS YES SW L310220CQGSSBB014 3.30E-02 SSS NO SW L310220CJGSSBA004 4.10E-02 SSS NO SW L310220CSGSSSB001 3.48E-02 555S NO SW L310220CJGSSSA005 1.93E-01 SSS YES SW L310220CSGSSSB002 4.09E-02 SSS NO SW L310220CJGSSBA005 1.10E-01 SSS YES SW L310220CSGSSSB003

-3.84E-03 SSS NO SW L310220CJGSSB8008 1.87E-01 SSB YES SW L310220CSGSSSB004 1.10E-02 SSB NO SW L310220C0GSSB8008 8.98E-03 SSS NO SW L310220CSGSSSB005 1.42E-02 SSS NO SW 1310220C0GSSBA014 1.89E-02 SSB NO SW L310220CSGSSSB006

-3.96E-03 SSS NO SW L310220CSGSSBAO01 4.27E-03 SSS NO SW L310220CSGSSSB007 4.14E-02 SSS NO SW L310220CSGSSBA002 1.35E-02 SSS NO SW L310220CSGSSSB008 2.22E-02 SSS NO SW 1310220CSGSSBA003 4.12E-02 SSS NO SW 1310220CSGSSSB009 1.88E-03 SSS NO SW L310220CSGSSBA004 2.31E-02 SSB NO SW L310220CSGSSSB010 5.28E-02 SSS NO SW L310220CSGSSBA005 1.32E-02 SSB NO SW L310220CSGSSSBO11 1.72E-02 SSB NO SW L310220CSGSSBA006

-6.68E-04 SSS NO SW L310220CSGSSSB013 7.68E-02 SSB YES SW L310220CSGSSBA007 4.78E-03 SSB NO SW L310220CSGSSSB014 2.32E-02 SSB NO SW L310220CSGSSBA008 7.76E-02 SSS NO SW L310220CSGSSSB015 4.04E-02 SSB NO SW L310220CSGSSBA009 0.OOE+00 SSS NO SW L310220CSGSSSB016 7.54E-03 SSS NO SW L310220CSGSSBA010

-9.42E-03 SSS NO

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 37 of 38 Cs-237 Result pCi/g Cs-137 Result pai/g SW 1.31UIIUL5655BA011 3.76E-02 SS5 NO SW 310220CS6~555A022 1.79E-02 SSS N

SW L310220CSGSSBA012 5.68E-03 SSS NO SW L310219CJGSSSA001 2.39E-01 S55 YE SW 1.310220CSGSSBA013

-2.32E-03 SSS NO SW L310219CJGSSSA001 3.37E-01 SSS YE SW L310220CSGSSBA014 3.91E-03 SSS NO SW L310219CJGSSBA001

-1.48E-03 SSS N

SW 1310220CSGSSBA015 1.85E-02 SSS NO SW L310219C1GSSSA002 1.11E-01 SSB N

SW L310220CSGSSBA016

-1.63E-02 SSS NO SW L310219CJGSSBA002 1.52E-01 SSB YE SW L310220CSGSSBA017 1.04E-02 SSS NO SW L310219CJGSSSA003 1.79E-O1 SSB YE SW L310220CSGSSBA018 1.70E-02 SSS NO SW L310219CJGSSBA003 1.27E-01 SSS YE SW 1310220CSGSSBA019 1.67E-02 SSS NO SW 1310219CJGSSSA004 1.20E-01 SSB YE SW L310220CSGSSBA020

-3.00E-02 SSS NO SW L310219CJGSSBA004

-1.90E-02 SSS N

SW L310220CSGSSBA021 2.57E-02 SSB NO SW L310219CJGSSSA005 1.09E-O1 SSS YE SW L310220CSGSSBA022 1.94E-02 SSS NO SW L310219CQGSSSA005 1.64E-01 SSS YE SW L310220CQGSSSAO14 3.33E-02 SSS NO SW L310219CJGSSBAO05 2.42E-02 SSS N

SW L310220CSGSSSA001 2.19E-03 SSB NO SW L310219CQGSSBA005 3.16E-03 SSS N

SW L310220CSGSSSA002 5.32E-02 SSS NO SW L310219COQGSSBA009 5.33E-02 SSS N

SW L310220CSGSSSA003 6.49E-02 SSS YES SW L310219CSGSSBA001 5.44E-02 SSB N

SW 1310220CSGSSSA004 9.49E-02 SSS YES SW L310219CSGSSBA002 4.64E-02 SSB N

SW L310220CSGSSSA005 2.66E-02 555 NO SW L310219CSGSSBA003 7.44E-03 SSS N

SW L310220CSGSSSA006 2.07E-04 SSS NO SW L310219CSGSSBA004 1.37E-03 SSS N

SW L310220CSGSSSA007 7.12E-02 SSS NO SW L310219CSGSSBA005

-1.22E-03 SSS N

SW L310220CSGSSSA008 4.76E-02 SSS NO SW L310219CSGSSBA006 3.05E-02 SSS N

SW L310220CSGSSSA009 2.02E-02 SSS NO SW 1310219CSGSSBAO07 1.69E-02 SSS N

SW L310220CSGSSSA010 1.38E-02 SSS NO SW L310219CSGSSBA008 8.75E-02 SSS N

SW L31022OCSGSSSA011 0.O0E+00 SSS NO SW L310219CSGSSBA009 1.68E-02 SSB N

SW L310220CSGSSSA012

-1.30E-02 SSS NO SW L310219CSGSSBA0010

-3.87E-03 SSS N

SW L310220CSGSSSA013

-4,84E-03 SSS NO SW L310219CSGSSBA0011 2.92E-02 SSS N

SW L310220CSGSSSA014 9.09E-03 SSB NO SW L310219CSGSSBA0012 7.74E-04 SSS N

SW L310220CSGSSSA015 1.47E-02 SSB NO SW L310219CSGSSBA0013 4.05E-02 SSS N

SW L310220CSGSSSA016 8.58E-03 SSS NO SW L310219CSGSSBA0014 1.57E-02 SSS N

SW L31O220CSGSSSA017

-5.49E-03 SSS NO SW L310219CSGSSBAO015 2.23E-02 SSS N

SW L310220CSGSSSA018

-6.82E-03 SSB NO SW L310219CSGSSBA0016 4.06E-03 SSS N

SW L310220CSGSSSA019 3.49E-02 SSS NO SW L310219CSGSSBA0017 6.96E-03 SSS N

SW L310220CSGSSSA020 3.75E-03 SSB NO SW L310219CSGSSBA0018 9,52E-03 SSS N

SW L310220CSGSSSA021 2.38E-03 SSS NO SW L310219CSGSSBA0019 2.68E-02 SSS N

Attachment B All Soil Sample Results Background Studies and Class 3 Southwest Survey Units EH&S TSD # 13-004 Revision 00 Page 38 of 38 Cs-137 Result pCi/g 9.09E-03 Cs-137 Result pCi/g 1.83E-02 2.13E-02 SW I I3U1C(SiIO2

+

I SW I L310219CQGSSSA009 I 1.35E-02 I SSS NO I

SW L310219CSGSSSA011 SSS NO NO SW L310219CSGSSSA001 1.06E-01 SSS NO I

SW L310219CSGSSSA012 5.19E-02 SSS

,NO SW L310219CSGSSSA002 1.49E-02 SSS NO I

SW L310219CSGSSSA013 2.63E-02 55S5 NO SW L310219CSGSSSA003 3.30E-02 SSS NO I

SW L310219CSGSSSA014 6.41E-02 SSS NO SW L310219CSGSSSA004 4.21E-02 SSS NO I

SW L310219CSGSSSA015 3.08E-02 SSS NO SW L310219CSGSSSAO05 5.82E-02 SSS NO I

SW L310219CSGSSSA016 2.53E-02 SSS NO SW L310219CSGSSSA006 3.84E-02 SSS NO I

SW L310219CSGSSSA017 2.93E-02 SSS NO SW L310219CSGSSSA007 3.66E-02 SSS NO I

SW L310219CSGSSSA018 9.14E-03 SSS NO SW L310219CSGSSSA008 1.30E-02 SSS NO I

SW L310219CSGSSSA019 1.02E-02 SSS NO SW L310219CSGSSSA009 1.88E-02 SSS NO I

SW L310219CSGSSSA020 4.20E-03 SSS NO