ML21145A081

2020 Annual Radiological Environmental Operating Report (Part 1, Summary and Interpretation)

ML21145A081
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Site:	Kewaunee
Issue date:	05/10/2021
From:	ATI Environmental Midwest Lab, Dominion Energy Kewaunee
To:	Office of Nuclear Reactor Regulation
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a Dominion i=' Energy 2020 Annual Radiological Environmental Operating Report Kewaunee Power Station Part/

Summary and Interpretation Don1inion Energy Kewaunee, Inco

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• ATI E:nvironmental, Inc.

M.I Midwest Laboratory 700 Landwehr Road

• Northbrook, IL 60062-23 IO phone (847) 56-0700

• fax (847) S64-4517 Approved:

ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT TO DOMINION NUCLEAR RADIOLOGICAL MONITORING PROGRAM FOR THE KEWAUNEE POWER STATION KEWAUNEE, WISCONSIN PART I -

SUMMARY

AND INTERPRETATION January 1 to December 31, 2020 Prepared an_d submitted by:

ATI ENVIRONMENTAL Inc.

Asnok D. Banavali, Ph.D.

Laboratory Manager Midwest laboratory Project No. 8002 J.Shannon Manager -

adiological Protection and Chemistry, KPS

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PREFACE The staff of ATI Environmental, Inc., Midwest Laboratory were responsible for the acquisition of data presented in this report. Assistance in sample collection was provided by Kewaunee Power Station personnel. The report was prepared by staff members of ATI Environmental, Inc., Midwest Laboratory.

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TABLE OF CONTENTS Page Preface......................................................................................................................................................... ii List of Figures.............................................................................................................................................. iv List of Tables................................................................................................................................................ iv

1.0 INTRODUCTION

.......................................................................................................................................... 1 2.0

SUMMARY

............................................................................................................................................... '............ 2 3.0 RADIOLOGICAL SURVEILLANCE PROGRAM........................................................................................... 3 3.1 Methodology.................................................................................................................................. 3 3.1.1 3.1.2 3.1.3 3.1.4 3.1.5 The Air Program.............................................................................................................. 3 The Terrestrial Program.................................................................................................. 4 The Aquatic Program...................................................................................................... 5

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3.2 Results and Discussion................................................................................................................. 7 3.2.1 Atmospheric Nuclear Detonations and Nuclear Accidents.............................................. 7 3.2.2 The Air Environment........................................................................................................ 7 3.2.3 The Terrestrial Environment.......................................................................................... 10 3.2.4 The Aquatic Environment.............................................................................................. 11 3.3 Land Use Census.................. :..................................................................................................... 12 3.4 Laboratory Procedures................................................................................................................ 12 4.0 FIGURES AND TABLES............................................................................................................................ 13

5.0 REFERENCES

.......................................................................................................................................... 25 APPENDICES A

lnterlaboratory Comparison Program Results............................................................................ A-1 B

Data Reporting Conventions...................................................................................................... 8-1 C

Effluent Concentrations............................................................................................................. C-1 iii

LIST OF FIGURES Caption Page 4-1 Sampling locations, Kewaunee Power Station............................................................................. 14 4-2 Groundwater Monitoring Wells, Kewaunee Power Station........................................................... 15 LIST OF TABLES Title Page 4.1 Sampling locations, Kewaunee Power Station.............................................................................. 16 4.2 Type and frequency of collection................................................................................................. 17 4.3 Sample codes used in Table 4.2................................................................................................. 17 4.4 Sampling summary, January - December, 2020......................................................................... 18 4.5 Environmental Radiological Monitoring Program Summary......................................................... 19 4.6 Land Use Census........................................................................................................................ 24 In addition, the following tables are in the Appendices:

Appendix A Attachment A: Acceptance criteria for spiked samples........................................... A-2 A-1 lnterlaboratory Comparison Crosscheck Program, Environmental Resource Associates RAD study (substitute program for EPA).............................................. A-3 A-2 lnterlaboratory Comparison Crosscheck Program, New York Department of Health (ELAP)......................................................................................................... A-4 A-3 lnterlaboratory Comparison Program Results, Thermoluminescent Dosimeters (TLDs).................................................................................................................... A-5 A-4 In-house Spiked Samples........................................................................................ A-7 A-5 In-house "Blank" Samples....................................................................................... A-10 A-6 In-house "Duplicate" Samples................................................................................. A-12 A-7 Department of Energy MAPEP comparison results................................................. A-16 A-8 lnterlaboratory Comparison Crosscheck Program, Environmental Resource Associates (substitute program for EML)................................................................. A-19 iv

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1.0 INTRODUCTION

The Kewaunee Power Station was a 598 megawatt pressurized water reactor located on the Wisconsin shore of Lake Michigan in Kewaunee County. The Plant became critical on March 7, 1974. Initial power generation was achieved on April 8, 197 4, and the Plant was declared commercial on June 16, 197 4.

On February 25, 2013, Dominion Energy Kewaunee submitted a certification of intent to cease power operations to the Nuclear Regulatory Commission. Power Operation of the Kewaunee Power Station ceased on May 7, 2013. The fuel was permanently removed from the reactor and placed in the spent fuel pool for storage on May 14, 2013. On June 15, 2017, the transfer of all spent fuel from the KPS Spent Fuel Pool (SFP) to the Independent Spent Fuel Storage Installation (ISFSI) was completed. All remaining irradiated materials were removed from the SFP in October of 2017. All radioactive liquid was drained from systems in the Auxiliary Building by the end of the first week of August 2018.

This report summarizes the environmental operation data collected during the period January -

December 2020.

Dominion Energy Kewaunee, operator and owner of the Kewaunee Power Station, assumes responsibility for the environmental program at the Plant. Any questions should be directed to Mr. Daniel J. Shannon, Manager Radiological Protection and Chemistry, at (920) 304-1129.

2.0

SUMMARY

Results of sample analyses during the period January - December 2020 are summarized in Table 4.5. Radionuclide concentrations measured at indicator locations are compared with levels measured at control locations and in preoperational studies. In no instance were REMP threshold reporting levels exceeded.

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• 3.0 RADIOLOGICAL SURVEILLANCE PROGRAM Following is a description of the Radiological Surveillance Program and its execution.

3.1 METHODOLOGY The sampling locations are shown in Figure 4-1. Table 4.1 describes the locations, lists for each direction and distance from the reactor, and defines which are the indicator and control locations.

The sampling program monitors the air, terrestrial, and aquatic environments. The types of samples collected at each location and the frequency of collections are presented in Table 4.2, using sample codes defined in Table 4.3. The collections and analyses that comprise the program are described below. Finally, the execution of the program in the current reporting year is discussed.

3.1.1 The Air Program Ambient Gamma Radiation - TLDs Ambient gamma radiation is monitored at the one control location (K-2), at four inner ring locations (K-1f, K-25, K-27 and K-30), and from six outer ring locations (K-3, K-5, K-8, K-17, K-39 and K-43) by thermoluminescent dosimetry (TLD}. Two TLD cards, each having four main readout areas containing CaSO4:Dy phosphor, are placed at each location (eight readout areas per each location). One card is exchanged quarterly, the other card is exchanged annually and read only on an emergency basis.

Dosimeters have also been placed at four additional locations (K-1m, K-1o, K-1q and K-1r), to monitor an Independent Spent Fuel Storage Installation (ISFSI) as part of the inner ring locations.

They are replaced and measured quarterly.

Airborne Particulates Airborne particulates are collected on 47 mm diameter filters, at a volumetric rate of approx. one cubic foot per minute. The filters are collected weekly from four locations (K-1f, K-2(control), K-8 and K-43), and dispatched by mail to ATI Environmental, Inc. for radiometric analysis. The p'articulate filters are counted for gross beta activity, a minimum of three days after the date of collection, to allow for the decay of naturally-occurring short-lived radionuclides.

Quarterly composites from each sampling location are analyzed for gamma-emitting isotopes on a high-purity germanium (HPGe) detector.

Airborne Iodine Airborne iodine analysis was discontinued beginning in 2018 due to the cessation of power operations (see Introduction on page 1).

Precipitation The collection and analysis of precipitation samples was discontinued beginning in 2018 due to the cessation of power operations (see Introduction on page 1).

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3.1.2 The Terrestrial Program Milk The collection and analysis of milk samples was discontinued beginning in 2018 due to the cessation of power operations (see Introduction on page 1).

WellWater Well water is collected quarterly from one off-site well location K-13 and from three on-site wells located at K-1h, K-1t and K-1u. Samples are only collected at locations K-1t and K-1u when these sources are tapped for drinking or irrigation purposes in areas where the hydraulic gradient or recharge properties are suitable for contamination.

Gamma spectroscopic analysis, tritium and gross beta on the total residue are performed for each water sample. The concentration of potassium-40 is calculated from total potassium. Samples of water from the three on-site wells (K-1 h, K-1 t and K-1 u) are analyzed for gross alpha. The water sample from K-1 h is also tested for strontium-90.

Monitoring wells and results associated With the Ground Water Protection Program (GWPP) are reported in the KPS Annual Radioactive Effluent Release Report (ARERR).

The groundwater monitoring well locations associated with the GWPP are included in Figure 4-2 along with the onsite well water sampling locations associated with the REMP.

Domestic Meat The collection and analysis of domestic meat was discontinued in 2018 due to the cessation of power operations (see Introduction on page 1).

.!;_gg§ The collection and analysis of eggs was discontinued in 2018 due to the cessation of power operations (see Introduction on page 1).

Broad leaf Vegetation Annually, during the third quarter, samples of broad leaf vegetation are collected from location K-26. Samples may also be obtained from other local sources to supplement the program. In addition, two samples of broad leaf vegetation are collected annually from farmland owned by Dominion Energy Kewaunee (K-23a and K-23b) and rented to a private individual for growing crops.

The samples are analyzed for gamma emitting isotopes.

Cattle Feed Cattle feed (e.g., hay and silage) is collected during the first quarter from dairy farm locations (K-3, K-5, K-34, K-35, K-38 and K-39). The samples are analyzed for gross beta, strontium-90 and gamma emitting isotopes.

Grass is collected during the second, third and fourth quarters from two on-site locations (K-1 b and K-1f) and from the dairy farm locations (K-3, K-5, K-34, K-35, K-38 and K-39). The samples are analyzed for gross beta, strontium-90 and gamma emitting isotopes.

Soil Soil samples are collected twice a year on-site at K-1f and from the dairy farm locations (K-3, K-34, K-35 and K-38). The samples are analyzed for gross alpha, gross beta, strontium-90 and gamma emitting isotopes.

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3.1.3 The Aquatic Program Surface Water Surface water samples are taken quarterly from two locations on Lake Michigan: 1) at the point where plant effluent water is discharged into Lake Michigan (K-1 d); and 2) at the main pumping station located approximately equidistant from Kewaunee and Green Bay, which pumps water from the Rostok water intake (K-9) located 11.5 miles NNE of the reactor site. Both raw and tap water are collected at K-9. One-gallon water samples are taken quarterly from two creeks that pass through the site (K-1b and K-1e). Samples from the Middle Creek (K-1b) are collected near the mouth of the creek. Samples from the South Creek (K-1 e) are collected about ten feet downstream from the point where the outflow from the two drain pipes meets.

The water is analyzed for gamma emitting isotopes, gross beta activity in total residue, dissolved and suspended solids, and potassium-40, tritium and strontium-90. The concentration of potassium-40 is calculated from the total potassium concentration.

Fish Fish samples are collected during the third quarter near location K-1d. The flesh is separated from the bones, gamma scanned and analyzed for gross beta activity. Bone samples are analyzed for gross beta, and strontium-90. A local fish market, (e.g.,Lafond's in Kewaunee), may be used for backup fish samples, if needed.

Aquatic Slime The collection and analysis of aquatic slime was discontinued in 2018 due to the cessation of power operations (see Introduction on page 1 ).

Shoreline Sediment Shoreline sediments are collected iii May and November from three locations (K-1c, K-1j and K-9) in areas with potential for recreational value. The samples are analyzed for gross beta, strontium-90 and gamma emitting isotopes.

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3.1.4 Program Execution Program execution is summarized in Table 4.4. The program was executed for the year 2020 as described in the preceding sections, with the following exceptions:

Air Particulates The sample pump was found degraded at location K-1f, for the sample period ending 2/18/20. There was no indication of flow during the filter changeout (CR#2016}.

A partial air particulate sample (61 m 3

} was collected at location K-8, for the sample period ending 3/10/20 due to pump problems. The pump was replaced (CR#2025).

No air particulate sample was able to be collected at location K-2, for the sample period ending 4/28/20. The air sampler was found on the ground (CR#2034).

A partial air particulate sample (243 m 3

} was collected at location K-1 f for the sample period ending 7/14/20, due to the loss of offsite power (CR#2063).

A partial air particulate sample (151 m 3

} was collected at location K-1f for the sample period ending 7/28/20. A fuse to the sample pump was blown (CR#2076).

The air particulate run time for the period ending 8/04/20 was calculated using filter service (change) dates/ times due to totalizer displays at K-43 and K-8 not showing indication (CR#2081). New hour/ minute totalizers were placed into service at air sampler locations K-43 and K-8 during the filter changeouts for the period ending 8/11/20.

New hour/ minute totalizers were placed into service at air sampler locations K-1f and K-2 during the filter changeouts for the period ending 8/25/20.

3.1.5 Program Modifications TLD's I Air Particulates TLD location K-1f was moved approximately 200 feet west of its previous location on 4/01/20 to the same location as the air sampler at location K-1f, which was moved in 2018 due to a change in the power source (REMM revision 22). The TLD was attached to the air sampler cage.

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3.2 RESULTS AND DISCUSSION Results for the reporting period January to December, 2020 are presented in summary form in Table 4.5. For each type of analysis, ofeach sampled medium, the table shows the annual mean and range for all indicator and control locations. The location with the highest annual mean and the results for this location are also given.

The discussion of the results has been divided into three broad categories: the air, terrestrial, and aquatic environments. Within each category, samples will be discussed in the order listed in Table 4.4.

Any discussion of previous environmental data for the Kewaunee Power Station refers to data collected by Environmental Inc., Midwest Laboratory.

Results of all measurements made in 2020 are not included in this section, although references to these results will be made in the discussion. A complete tabulation of results is provided in Part II of the 2020 annual report on the Radiological Monitoring Program for the Kewaunee Power Station.

3.2.1 Atmospheric Nuclear Detonations and Nuclear Accidents There were no atmospheric nuclear tests or accidents reported in 2020. The Chernobyl and Fukushima Daiichi nuclear accidents occurred on April 26, 1986 and March 11, 2011, respectively. The last reported atmospheric nuclear test was conducted by the People's Republic of China on October 16, 1980. Contributions from these events have resulted in the presence of long-lived radioisotopes of cesium and strontium still detectable in the environment.

3.2.2 The Air Environment Ambient Gamma Radiation - TLDs Ambient gamma radiation was monitored by TLDs at eleven locations, ten indicators (K-1f, K-3, K-5, K-8, K-17, K-25, K-27, K-30, K-39 and K-43) and one control (K-2). TLDs at the indicator locations measured a mean dose equivalent of 16.4 mR/91 days, in close agreement with the control location 16. 7 mR/91 days. The readings are similar to the averages obtained from 2002 (and prior to) through 2019.

These results support the conclusion that no plant effect on ambient gamma radiation was indicated. These values are lower than the United States average value of 19.5 mR/91 days due to natural background radiation (National Council on Radiation Protection and Measurements, 1975). The highest annual mean was 18.3 mR/91 days, measured at indicator location K-25.

Year Averaae (Indicators)

Averaae (Controls)

Dose rate (mR/91 days) 2006 16.4 15.0 2007 16.2 15.2 2008 15.6 14.2 2009 15.2 13.9 2010 15.2 14.3 2011 15.0 14.5 2012 16.1 15.3 2013 16.2 15.5 2014 15.0 14.8 2015 16.2 16.1 2016 16.5 15.9 2017 16.1 15.4 2018 16.4 17.1 2019 15.8 16.6 2020 16.4 16.7 Ambient gamma radiation as measured by thermoluminescent dosimetry. Average quarterly dose rates.

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Using ANSI/HPS N13.37-2014 as guidance, a determination of facility related dose was performed using quarterly TLD data from control and indicator locations from 2010 through 2019. A baseline background dose (B0) was computed for each TLD location. Then a Quarterly Minimum Differential Dose (MDD0 ) was calculated as 3 times the 90th percentile of the *standard deviations of the historical quarterly results. The result of this calculation was 6.2 mrem. Transit and storage doses weren't considered since the TLD's currently are, and have historically been, collected in the field and delivered to the laboratory for immediate processing.

2020 results at all locations, both indicator and control, were lower than the sum of the Baseline Background Dose (80 ) and the Quarterly Minimum Differential Dose (MDD0 ), which according to ANSI/HPS N13.37-2014 indicates no detection (ND) and which supports the conclusion that there is no plant effect.

Normalized Quarterly Monitoring Data Quarterly Facility Dose Monitoring Quarterly M0 (mrem per standard quarter)

F0 = M0 - [B0+MDD0](mrem)

Baseline Location B0(mrem) 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Indicators K-1f 13.9 13.2 15.4 14.0 15.1 ND ND ND ND K-3 17.3 16.3 16.4 16.4 16.1 ND ND ND ND K-5 16.5 14.9 16.0 15.5 16.6 ND ND ND ND K-8 15.4 15.9 16.8 15.6 17.1 ND ND ND ND K-17 16.0 17.2 19.0 17.3 19.1 ND ND ND ND K-25 17.6 16.9 19.3 17.7 19.1 ND ND ND ND K-27 16.2 16.3 17.8 16.8 17.8 ND ND ND ND K-30 15.9 16.5 14.7 16.2 15.0 ND ND ND ND K-39 16.0 17.3 17.6 17.0 17.6 ND ND ND ND K-43 14.6 14.1 15.0 13.7 14.5 ND ND ND ND Control K-2 16.4 16.5 16.6 17.1 16.6 ND ND ND ND Table assumes 1 roentgen = 1 rem.

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• Airborne Particulates The annual gross beta concentration in air particulates averaged 0.023 pCi/m3 at both the indicator and control locations, similar to the means observed from 2002 (and prior to) through 2019. There is no indication of a plant effect, the average readings were evenly distributed between indicator and control locations. New sampler pumps were installed in the third quarter of 2010. The slight increases in beta activity may be due to a change in the calculated volume. Results are tabulated below.

Year Average (Indicators)

Average (Controls)

Concentration (pCi/m 3

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2002 0.023 0.023 2003 0.022 0.022 2004 0.019 0.020 2005 0.023 0.023 2006 0.021 0.021 2007 0.022 0.021 2008 0.022 0.022 2009 0.023 0.023 2010 0.023 0.022 2011 0.029 0.029 2012 0.029 0.030 2013 0.024 0.025 2014 0.019 0.019 2015 0.022 0.022 2016 0.021 0.020 2017 0.021 0.021 2018 0.023 0.024 2019 0.021 0.019 2020 0.023 0.023 Average annual gross beta concentrations in airborne particulates.

Variation in the gross beta activity throughout the year is not unusual. Typically, higher beta averages occur during the months of January and December, and the first and fourth quarters, as noted in data from 2002 through 2020.

Gamma spectroscopic analysis of quarterly composites of air particulate filters yielded similar results for indicator and control locations. Beryllium-?, produced continuously in the upper atmosphere by cosmic radiation, was detected in all samples, with an average activity of 0.088 pCi/m at the indicator locations and an average of 0.085 pCi/m3 at the control location. All other gamma-emitting isotopes were below their respective MDC levels.

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3.2.3 The Terrestrial Environment Well Water Three of twelve samples tested positive for gross alpha at an average of 2.6 pCi/L. Detectable gross beta activity was measured in two of the twelve indicator samples and also in one of the four control samples tested. The average of indicator samples concentration measured 2.0 pCi/L versus a measurement of 1.4 pCi/L for the positive control sample. These levels are consistent with the concentrations of potassium-40 measured (2.17 pCi/L average for indicators versus 1.38 pCi/L average for controls). It is not unusual to see high potassium-40 levels in an agricultural setting.

Potassium-40 is present wherever stable potassium is found. Therefore positive results can be attributed to agricultural runoff. The gross alpha activities are most likely contributions from naturally-occurring daughters of radium and thorium when detected in the well water. _

No strontium-90 was detected in any of the four samples tested. All concentrations measured below an MDC value 0.6 pCi/L.

Sixteen well water samples were tested for tritium and gamma emitting isotopes. All tritium concentrations measured below a detection level of 159 pCi/L. Gamma-emitting isotopes measured below respective MDC levels.

Broad Leaf Vegetation Three samples of broad leaf vegetation were analyzed for gamma emitters. Only naturally occurring potassium-40 and beryllium-? were detected.

Cattle Feed In the twelve cattlefeed samples analyzed in 2020 the gross beta average concentrations of 13. 02 pCi/g wet indicator and 13.05 pCi/g wet control agree well with the potassium-40 average concentration results of 10.12 pCi/g wet indicator and 10.94 pCi/g wet control. Strontium-90 was detected in two of the eight indicator samples at a level of 0.021 pCi/g wet and two of the four control samples at a level of 0.014 pCi/g wet. Cesium-137 was detected in one of the eight indicator samples at a level of 0.056 pCi/g wet. Trace levels of strontium-90 and cesium-137 in the environment can be attributed to nuclear testing and accidents. These results are also comparable to historical results for analysis of cattle feed. No plant effect is indicated.

Grass Eight grass samples were collected in June, August and October at six indicator locations and two control locations for a total of twenty-four samples for the year. The samples were analyzed for gross beta, strontium-90 and gamma emitting isotopes. Analysis results show very good agreement between the gross beta results and the potassium-40 results. Naturally occurring beryllium-? was also detected in all of the samples. Strontium-90 tested below an overall MDC of 0.007 pCi/g wet in all twenty-four samples tested.

With the exception of the naturally-occurring beryllium and potassium, all gamma-emitting isotopes were below MDC levels. These results are comparable to historical results for analysis of grass. No plant effect is indicated.

Soil Gross alpha concentrations in soil averaged 6.20 pCi/g dry in the six indicator samples and 4.50 pCi/g dry in the four control samples. Mean gross beta levels measured at indicator and control locations averaged 25.63 and 20.54 pCi/g dry, respectively, primarily due to potassium-40 activity.

Strontium-9_0 was measured below an overall MDC value of 0.046 pCi/g dry in the ten samples tested.

Cesium-137 was detected in five of six indicator samples and three of four control soil samples at an average of 0.08 pCi/g dry at the indicator and 0.07 pCi/g dry at the control locations. Trace levels of Cs-137 in the environment can be attributed to nuclear testing and accidents. Potassium-40 was detected in all samples and averaged 18.49 and 13.20 pCi/g dry for indicator and control locations, 10

respectively. Naturally occurring Be-7 was detected in two of six indicator samples and one of four control samples at a concentration of 0.27 and 1.30 pCi/ gdry respectively. All other gamma-emitting isotopes were below respective MDC levels. The levels of detected activities are similar to those observed from 1990 through 2019. The data suggests no evidence of a plant effect.

3.2.4 The Aquatic Environment Surface Water Gross beta activity in surface water measured higher at the indicator locations (3.3 pCi/L) than at the control locations (0.9 pCi/L). A similar pattern of activity has been observed since 1978. The highest gross beta activities measured in 2020 were sampled from location K-1 e. The average activity was 5.2 pCi/L, with a range of 0.5 to 15.9 pCi/L. The potassium-40 concentrations also averaged 4.4 pCi/L and ranged from 1.4 to 24.6 pCi/L at the indicator locations, with the highest activity measured at location K-1e (8.0 pCi/L).

Year Averaae (Indicators)

Average (Controls)

Gross Beta (J;!Ci/L) 2002 5.7 2.2 2003 7.3 2.4 2004 6.2 2.3 2005 5.2 1.7 2006 5.5 1.8 2007 5.7 1.8 2008 4.7 1.5 2009 4.7 1.5 2010 4.7 1.4 2011 5.0 1.5 2012 6.1 1.4 2013 5.7 1.5 2014 4.4 1.9 2015 4.2 1.4 2016 5.2 1.6 2017 4.2 1.4 2018 2.8 1.1 2019 3.1 1.2 2020 3.3 0.9 Average annual gross beta concentrations in surface water.

Sampling at location K-1k was discontinued in 2018. Location K-1k had historically displayed higher gross beta and potassium-40 levels due to agricultural runoff. The remaining sampling locations exhibit results that are comparable with past results.

Tritium and Sr-90 were measured below their respective MDC's of 159 pCi/L and 0.6 pCi/ L for all twenty quarterly samples taken in 2020.

With the exception of naturally occurring potassium-40, gamma-emitting isotopes measured below their respective MDC levels in all samples.

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Fish In the fish sample, the gross beta concentration was 4.48 pCi/g wet in flesh and 4.56 pCi/g wet in bone fractions. In flesh, the gross beta concentration was primarily due to the potassium-40 concentration of 3.87 pCi/g wet.

Excluding potassium-40, gamma-emitting isotopes measured below their respective MDC levels.

Strontium-90 was detected at a concentration of 0.15 pCi/g wet in the bone fractions. Trace levels of strontium-90 can be attributed to nuclear testing and fallout.

Shoreline Sediments In shoreline sediment samples, the mean gross beta concentrations measured an average 6.87 pCi/g dry at the indicator locations versus an average of 9.63 pCi/g dry at the control location. These results are consistent with the average levels of potassium-40 measured in these s;:imples (4.33 pCi/g dry and 6.67 pCi/g dry respectively).

Cesium-137 was detected in one of four samples taken in 2020 at the indicator locations at a level of 0.019 pCi/g dry and in one of the two samples taken at the control location measuring at a concentration of 0.018 pCi/g dry. Trace levels of Cs-137 in the environment can be attributed to nuclear testing and fallout. Other gamma-emitting isotopes, with the exception of naturally-occurring potassium-40, were below their respective MDC levels.

Strontium-90 was measured below an MDC of 0.049 pCi/g dry for all locations.

These results support the conclusion that there is no plant effect.

3.3 LAND USE CENSUS The Land Use Census satisfies the requirements of the KPS Radiological Environmental Monitoring Manual. Section 2.2.2 states:

"A land use census shall be conducted and shall identify within a distance of 8 km (5 mi.) the location, in each of the 10 meteorological sectors, of the nearest residence and the nearest garden of greater than 50m2 (500 ft2) producing broad leaf vegetation." (Figure 4-1)

The 2020 Land Use Census was completed to identify the presence of the nearest milk animals, gardens and farm crops surrounding the Kewaunee Power Station. The Land Use Census was conducted on September 2, 2020. The census is performed annually during the growing season per Radiation Protection Procedure RP-KW-001-014.

The Land Use Census observed that in Sector B there was no garden found where there had been one previously. A summary of the Land Use Census is shown in table 4.6.

3.4 LABORATORY PROCEDURES Analytical Procedures used by Environmental, Inc. are on file and are available for inspection.

Procedures are based on those prescribed by the Health and Safety Laboratory of the U.S. Dep't of Energy, Edition 28, 1997, U.S. Environmental Protection Agency for Measurement of Radioactivity in Drinking Water, 1980, and the U.S. Environmental Protection Agency, EERF, Radiochemical Procedures Manual, 1984.

Environmental, Inc., Midwest Laboratory has a comprehensive quality control/quality assurance program designed to assure the reliability of data obtained. Details of the QA Program are presented elsewhere (Environmental, Inc., Midwest Laboratory, 2018). The QA Program includes participation in lnterlaboratory Comparison (crosscheck) Programs. Results obtained are presented in Appendix A.

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4.0 FIGURES AND TABLES 13

Figure 4-1. Sampling locations, Kewaunee Power Station.

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~1'7Lr i,t:LL em:;l.dQn 12/1312017 11 :2:8:40 AM Figure 4-2. Groundwater Monitoring Wells, Kewaunee Power Station.

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Table 4.1. Sampling locations. Kewaunee Power Station.

Code K-1 K-1b K-1c K-1d K-1e K-1f K-1h K-1j K-1m K-1o K-1q K-1r K-1t K-1u K-2 K-3° K-5 K-8 K-9 K-13 K-17 K-23a K-23b K-25 K-26 K-27 K-30 K-34 K-35 K-38 K-39 K-43 Type a I

C 1/C C

C C

C Distance (miles)b and Sector 0.12 N 0.10 N 0.10 E 0.12S 0.12 S 0.12NW 0.10 S 0.15 N 0.16 N 0.16 N 0.13 N 0.10 ESE 0.05SSW 8.91 NNE 5.9 N 3.2NNW 4.85WSW 11.5 NNE 3.0SSW 4.0W 0.5W 0.6 N 1.9SW 9.1 SSW 1.53 NW 0.8 N 2.7 N 6.71 mi. WNW 2.45 mi. WNW 3.46 mi. N 2.71 SSW a I = indicator; C = control b Distances are measured from reactor stack.

Onsite Middle Creek Location 500' north of condenser discharge Condenser discharge South Creek Maintenance Waste Oil and Material Storage Building North Well 500' south of condenser discharge ISFSI East ISFSI North ISFSI West ISFSI West Gatehouse Maintenance Building WPS Operations Building in Kewaunee Lyle and John Siegmund Farm, N2815 Hwy 42, Kewaunee Ed Paplham Farm, E4160 Old Settlers Rd, Kewaunee St. Isadore the Farmer Church, 18424 Tisch Mills Rd, Tisch Mills Green Bay Municipal Pumping Station, six miles east of Green Bay (sample source is Lake Michigan from Rostok Intake two miles north of Kewaunee.

Rand's General Store, Two Creeks Klimesh's' Farm, N885 Tk B, Kewaunee 0.5 miles west of plant, Kewaunee site 0.6 miles north of plant, Kewaunee site Wotachek Fann, 3968 E. Cly Tk BB, Two Rivers Wilfert Farms Vegetable Stand (9.1 miles south of "BB")

Schleis Fann, E4298 Sandy Bay Rd, Kewaunee End of site boundary Leon and Vicky Struck, N1549 Lakeshore Dr., Kewaunee Duane Ducat, N1215 Sleepy Hollow Rd., Kewaunee Dave Sinkula Farm, N890 Town Hall Road, Kewaunee Francis Wojta, N1859 Lakeshore Dr., Kewaunee Gary Maigatter Property, 17333 Hwy 42, Two Rivers c Location K-3 is an indicator for ambient radiation and a control for soil, cattle feed, and grass.

16

• * * * * * * * * * * * * * * * * * * * * *,. i. * * * * * * * * * * * * * * * * * * *

• Table 4.2. Type and frequency of collection.

Location Weekly Quarterly Semiannually Annually K-1b SW GR*

K-1c SS b K-1d SW Fl 0

K-1e SW K-1f AP 9 GRa TLD so K-1h WW K-1i ssb K-1m TLD K-1o TLD K-1q TLD K-1r TLD K-11 WWh K-1u WWh K-2 AP 9 TLD K-3 GRa TLD so CFd K-5 GR*

TLD CF d K-8 AP 9 TLD K-9 sw1 SS b K-13 WW K-17 TLD K-23a BLV 0

K-23b BLV 0

K-25 TLD K-26 BLV 0 K-27 TLD K-30 TLD K-34 GR*

so CF d K-35 GR" so CFd K-38 GR" so CFd K-39 GR" TLD CFd K-43 AP 9 TLD a Three times a year, second (April, May, June), third (July, August, September), and fourth (October, November, December) quarters b To be collected in May and November cAnnually in the third quarter (July, August, or September).

d First (January, February or March) quarter only.

eAlternate, since milk sampling is no longer performed.

1 Two samples, raw and treated 9 The frequency may be increased dependent on the dust loading.

h Well water shall be taken when this source is tapped for drinking or irrigation purposes in areas where the hydraulic gradient or recharge properties are suitable for contamination.

Table 4.3. Sample Codes:

Code Description AP Airborne particulates BLV Broad leaf vegetation CF Cattle feed Fl Fish GR Grass so Soil SW Surface water ss Shoreline sediment TLD Thermoluminescent dosimeter wvv Well water 17

Table 4.4. Sampling Summary, January - December, 2020.

Sample Type Air Environment TLD's Airborne particulates Terrestrial Environment Well water Broad Leaf Vegetation Cattle Feed Grass Soil Aquatic Environment Surface water Fish Shoreline sediments Collection Type and Frequency*

C/Q CNIJ G/Q G/A G/A GITA G/SA G/M G/A G/SA

• Type of collection is ccided as follows: C = continuous; G = grab.

Number of Locations 15 4

4 3

6 8

5 4

3 Frequency is coded as follows: W = weekly; BW = bi-weekly; SM = semimonthly; M = monthly; Q = quarterly; SA= semiannually; TA= three times per year; A= annually.

18 Number of Samples Collected 60 207 16 3

12 24 10 20 6

Number of Samples Missed 0

1 0

0 0

0 0

0 0

0

• 1 * * * * * * * * * * * * * * * * * * * * * * * * *

• Table 4.5 Environmental Radiation Monitoring Program Summary.

Kewaunee Power Station Name of Facility Location of F aci lily Kewaunee County, Wisconsin (County, State)

Indicator Sample Type Type and Locations (Units)

Number of MDCb Mean(FJ° Analyses*

Range TLDs (Quarterly)

Gamma 44 6.2' 16.4 (40/40)

(mR/91 days)

(13.2-19.3)

TLDs, Quarterly Gamma 16 6.2' 84.2 (16/16)

(Protected Area)

(17.0-159.7)

(mR/91 days)

Airborne GB 207 0.010 0.023 (156/156)

Particulates (0.012-0.051)

(pCi/m3)

GS 16 Be-7 0.020 0.088 (12/12)

(0.068-0.110)

Nb-95 0.0017

<MDC Zr-95 0.0024

<MDC Ru-103 0.0016

<MDC Ru-106 0.0106

<MDC Cs-134 0.0013

<MDC Cs-137 0.0012

<MDC Ce-141 0.0025

< MDC Ce-144 0.0063

< MDC 19 Docket No.

...;5:..:0c...-3:..;0:..:5'--------

Reporting Period January-December, 2020 Location with Highest Control Number Annual Mean Locations Non-Mean (F) 0 Routine Locationd Mean (F)° Range 0

Range 0

Results*

0 K-25,Wotachek 18.3 (4/4) 16.7 (4/4)

Farm (16.9-19.1)

(16.6-17.1) 1.9SW K-1m, ISFSI E 156.4 (4/4) none 0

0.15 N (151.2-159.7)

K-43, Maigatter 0.023 (52/52) 0.023 (51/51) 0

Property, (0.012-0.043)

(0.012-0.047) 2.71 SSW K-8, St. Isadore 0.023 (52/52)

The Farmer Church, 4.85WSW (0.012-0.051)

K-43,Maigatter 0.089 (4/4) 0.085 (4/4) 0 Property (0.072-0.106)

(0.065-0.103) 2.71 SSW

<MDC 0

<MDC 0

<MDC 0

<MDC 0

<MDC 0

<MDC 0

<MDC 0

<MDC 0

Table4.5 Environmental Radiation Monitoring Program Summary.

Name of Facility Location of Facility Kewaunee Power Station Kewaunee County, Wisconsin (county, state)

Docket No.

50-305 Reporting Period January-December, 2020 Indicator Location with Highest Control Number Sample Type Type and Locations Annual Mean Locations Non-(Units)

Numberof MDCb Mean(F/

Locationd Mean(Ft Mean(Ft Routine Analyses*

Range Range Range Results*

GA 12 5.1 2.6 (3/12)

K-1 t, Gatehouse 2.9 (2/4)

None 0

Well Water (2.0-3.2) 0.10 mi, ESE (2.5-3.2)

(pCi/L)

GB 16 3.7 2.0 (2/12)

K-1 t, Gatehouse 2.0 (2/4) 1.4(1/4) 0 (2.0-2.0}

0.10 mi, ESE (2.0-2.0)

H-3 16 159

<MDC

<MDC 0

K-40 16 0.3 2.17 (12/12)

K-1t, Gatehouse 3.04 (4/4) 1.38(4/4) 0 (1.31-3.28) 0.10 mi, ESE (2.79-3.28)

(1.15-1.56)

Sr-90 4

0.6

<MDC None 0

GS 16 Mn-54 4.5

<MDC

<MDC 0

Fe-59 9.7

<MDC

<MDC 0

Co-58 5.8

<MDC

<MDC 0

Co-60 6.6

<MDC

<MDC 0

Zn-65 16.9

<MDC

<MDC 0

Zr-Nb-95 10.7

<MDC

<MDC 0

Cs-134 7.0

<MDC

<MDC 0

Cs-137 6.0

<MDC

<MDC 0

Ba-La-140 7.5

<MDC

<MDC 0

Broad leaf GS 3

Vegetation Be-7 (pCi/gwet) 0.100 1.58 (2/2)

K-23a 1.79 (1/1)

<MDC 0

(1.37-1.79) 0.5 mi W. of Plant K-40 0.50 5.45 (2/2)

K-23b 5.72 (1/1) 1.95 (1/1) 0 (5.17-5.72) 0.6 mi N. of Plant Nb-95 0.019

<MDC

<MDC 0

Zr-95 0.034

<MDC

<MDC 0

Ru;103 0.023

<MDC

<MDC 0

Ru-106 0.130

<MDC

<MDC 0

Cs-134 0.020

<MDC

<MDC 0

Cs-137 0.016

<MDC

<MDC 0

Ce-141 0.045

<MDC

< MDC 0

Ce-144 0.142

<MDC

<MDC 0

GB 12 0.008 13.02 (8/8)

K-3, Siegmund Farm 17.00 (2/2) 13.05 (4/4) 0 Cattle feed (2.02-26.44) 5.9mi. N (8.84-25.15)

(7.36-25.15)

(pCi/gwet)

Sr-90 12 0.026 0.021 (2/8)

K-39,Wojta Residence 0.022 (1/2) 0.014 (2/4) 0 (0.020-0.022) 3.46 mi. N (0.010-0.017)

GS 12 Be-7 0.269 0.85 (6/8)

K-3, Siegmund Farm 2.80 (1/1) 2.80(1/4) 0 (0.39-1.36) 5.9mi. N K-40 0.50 10.12 (8/8)

K-3, Siegmund Farm 15.86 (2/2) 10.94 (4/4) 0 (3.51-21.65) 5.9mi. N (8.84-25.23)

(4.80-24.23)

Nb-95 0.032

<MDC

<MDC 0

Zr-95 0.056

< MDC

<MDC 0

Ru-103 0.032

<MDC

<MDC 0

Ru-106 0.201

<MDC

<MDC 0

Cs-134 0.035

< MDC

<MDC 0

Cs-137 0.036 0.056 (1/8)

K-38, Sinkula Farm 0.056 (1/2)

<MDC 0

2.4mi WNW Ce-141 0.049

<MDC

<MDC 0

Ce-144 0.216

<MDC

<MDC 0

20

Table4.5 Environmental Radiation Monitoring Program Summary.

Kewaunee Power Station Docket No.

50-305 Name of Facility Location of Facility Kewaunee County, Wisconsin Reporting Period January-December, 2020 (County, State)

Indicator Location with Highest Control Number Sample Type Type and Locations Annual Mean Locations Non-(Units)

Number of MDCb Mean(F)° Mean (F) 0 Mean(~)° Routine Analyses*

Range Locationd Range0 Range Results*

Grass GB 24 0.10 8.93(18/18)

K-34, Struck Residence 12.28 (3/3)

8. 3 (6/6) o (pCi/gwet)

(6.03-22.81) 2.7mi N (6.03-22.81)

(7.17-8.54)

Sr-90 24 0.007

<MDC

<MDC o

GS 24 Be-7 0.26 3.05 (18/18)

K-34, Struck Residence 3.88 (3/3) 1.63 (6/6) o (0.28-7.72) 2.7mi N (2.01-5.76)

(0.21-3.54)

K-40 0.50 5.23 (18/18)

K-34, Struck Residence 8.45 (3/3) 6.30 (6/6) o (3.95-14.36) 2.7mi. N (3.95-14.36)

(5.25-6.94)

Mn-54 0.029

<MDC r

<MDC o

Co-58 0.026

<MDC

<MDC o

Co-60 0.024

<MDC

<MDC 0

Nb-95 0.031

< MDC

<MDC o

Zr-95 0.046

<MDC

<MDC 0

Ru-103 0.025

< MDC

<MDC o

Ru-106 0.219

<MDC

<MDC 0

Cs-134 0.034

<MDC

<MDC 0

Cs-137 0.027

<MDC

<MDC o

Ce-141 0.065

<MDC

<MDC o

Ce-144 0.246

<MDC

<MDC o

Soil GA 10 5.6 6.20 (6/6)

K-38, Sinkula Farm 7.81 (2/2) 4.50 (4/4) o (pCi/gdry)

(4.49-9.46) 2.4mi WNW (6.16-9.46)

(3.41-5.98)

GB 10 2.0 25.63 (6/6)

K-38, Sinkula Farm 30.11 (2/2) 20.54 (4/4) o (22.27-30.38) 2.4mi. WNW (29.83-30.38)

(16.65-28.35)

Sr-90 10 0.046

<MDC

<MDC o

GS 10 Be-7 0.43 0.27 (2/6)

K-38, Sinkula Farm 0.28 (1/2) 1.30 (1/4) o (0.26-0.28) 2.4mi WNW K-40 1.4 18.49 (6/6)

K-38, Sinkula Farm 20.96 (2/2) 13.20(4/4) o (16.34-21.36) 2.4mi WNW (20.56-21.36)

(10.34-18.63)

Nb-95 0.182

< MDC

<MDC 0

Zr-95 0.105

<MDC

<MDC o

Ru-103 0.089

<MDC

<MDC o

Ru-106 0.256

< MDC

<MDC 0

Cs-134 0.035

< MDC

<MDC o

Cs-137 0.024 0.08 (5/6)

K-38,Sinkula Farm 0.09 (2/2) 0.07 (3/4) 0 (0.06-0.10) 2.4miWNW (0.08-0.10)

(0.05-0.08)

Ce-141 0.203

< MDC

<MDC 0

Ce-144 0.196

< MDC

<MDC o

21

Table 4.5 Environmental Radiation Monitoring Program Summary.

Name of Facility Location of Facility Sample Type Type and (Units)

Number of Analyses*

Surface Water GB(TR) 20 (pCi/L)

GS 20 Mn-54 Fe-59 Co-58 Co-60 Zn-65 Zr-Nb-95 Cs-134 Cs-137 Ba-La-14.0 H-3 20 Sr-90 20 K-40 29 Fish (Flesh)

GB 1

(pCi/gwet)

GS 1

K-40 Mn-54 Fe-59 Co-58 Co-60 Cs-134 Cs-137 Fish (Bones)

GB 1

(pCi/gwet)

Sr-90 1

Kewaunee Power Station Docket No.

50-305 Kewaunee County, Wisconsin Reporting Period January-December, 2020 (County, State)

Indicator Location with Highest Control Number Locations Annual Mean Locations Non-MDCb Mean (F/

Mean (F/

Mean(F)° Routine Range Locationd Range Range 0

Results*

1.3 3.3 (12/12) l:<-1 e, Middle Creek 5.2 (4/4) 0.9 (8/8) 0 (0.5 -15.9) 0.12 N (0.5-15.9)

(0.5 - 1.1) 5.4

<MDC

<MDC 0

9.6

<MDC

<MDC 0

4.8

<MDC

<MDC 0

6.4

<MDC

<MDC 0

16.2

<MDC

<MDC 0

9.5

<MDC

<MDC 0

5.3

<MDC

<MDC 0

6.2

<MDC

<MDC 0

8.8

<MDC

<MDC 0

159

<MDC

<MDC 0

0.6

<MDC

<MDC 0

0.25 4.4 (11/12)

K-1e, Middle Creek 8.0 (4/4) 1.4 (7/8) 0 (1.4-24.6) 0.12 N (1.6-24.6)

(1.2-1.5) 0.5 4.48 (1/1)

K-1d, Cond. Discharge 4.48 (1/1)

None 0

0.10 mi. E 0.5 3.87 (1/1)

K-1 d, Cond. Discharge 3.87 (1/1)

None 0

0.10mi. E 0.028

<MDC None 0

0.058

<MDC None 0

0.019

<MDC None 0

0.016

<MDC None 0

0.022

< MDC None 0

0.025

<MDC None 0

0.5 4.56 (1/1)

K-1 d, Cond. Discharge 4.56 (1/1)

None 0

0.10 mi. E 0.16 0.15 (1/1)

K-1d, Cond. Discharge 0.15 (1/1)

None 0

0.10 mi. E 22

Table 4.5 Environmental Radiation Monitoring Program Summary.

Kewaunee Power Station Docket No.

50-305 Name of Facility Location of Facility Kewaunee County, Wisconsin Reporting Period January-December, 2020 (County, State)

Indicator Location with Highest Control Number Sample Type Type and Locations Annual Mean Locations Non-Number of MDCb Mean (F) 0 Mean (F) 0 Routine (Units)

Mean (F) 0 Analyses" Range 0

Locationd Ranae 0

Range 0

Results*

Shoreline GB 6

1.0 6.87 (4/4)

K-9, Rostek Intake 9.63 (2/2) 9.63 (2/2)

Sediments (4.55-8.81) 11.5 mi. NNE (7.76-11.49)

(7.76-11.49)

Sr-90 6

0.049

<MDC

<MDC GS 6

K-40 0.5 4.33 (4/4)

K-9, Rostek Intake 6.67 (2/2) 6.67 (2/2)

(3.10-5.58) 11.5 mi. NNE (5.41-7.92)

(5.41-7.92)

Co-58 0.037

<MDC

<MDC Co-60 0.026

<MDC

<MDC Cs-134 0.022

<MDC

<MDC Cs-137 0.024 0.019 (1/4)

K-1c, N. of Cond.

0.019 (1/2) 0.018 (1/2)

Discharge 0.10 mi. N

• GA = gross alpha, GB = gross beta, GS = gamma spectroscopy, TR = total residue.

b MDC = Minimum Detectable Concentration based on a 4.66 sigma counting error for background sample.

0 Mean and range are based on detectable measurements only (i.e., >MDC) Fraction of detectable measurements at specified locations is indicated in parentheses (F).

d Locations are specified by station code (Table 4.1) and distance (miles) and direction relative to reactor site.

• Non-routine results are those which exceed ten times the control station value. If no control station value is available, the result is considered non-routine if it exceeds ten times the preoperational value for the location.

0 0

0 0

0 0

0 1 For TLD's this value is the Quarterly Minimum Differential Dose(MDD0 ). See page 8 of this report for the details of how it is computed.

23

Table 4.6 Land Use Census The following table lists an inventory of residence gardens ;;:: 500 ft2 and milk animals found nearest the plant in each of the 1 0 meteorological sectors within a five mile radius of the Kewaunee Power Station. (Figure 4-1)

Sector Township No.

Residence Garden Milk Animals Distance From Plant <miles)

A 24 X

1.12 A

12 X

3.71 A

1 X

4.62 8

24 X

(Note 2) 1.01 8

18 X

2.70 R

26 X

0.96 R

23 X

X 2.16 Q

23 X

1.27 Q

23 X

X 1.53 p

26 X

1.35 p

26 X

1.41 p

27 X

2.45 N

35 X

0.94 N

28 X

X 2.37 M

35 X

(Note 3) 1.38 M

4 X

2.89 L

35 X

1.00 L

2 X

2.04 L

4 X

3.26 K

36 X

(Note 4) 0.91 K

15 X

3.40 J

11 X

(Note 5)

(Note 5) 2.72 Note 1. Bold Type denotes change from previous census.

Note 2. There were no gardens located in Sector B within five miles of the Kewaunee Power Station.

Note 3. There were no gardens located in Sector M within five miles of the Kewaunee Power Station.

Note 4. There was no garden located in Sector K within five miles of the Kewaunee Power Station.

Location ID K-34 K-27 K-38 Note 5. There were no milk animals or gardens located in Sector J within five miles of the Kewaunee Power Station.

24

• * * * * * * * * * * * * * * * * *

• I. * * * * * * * * * * * *

5.0 REFERENCES

Arnold. J. R. and H. A. AI-Salih. 1955. Beryllium-7 Produced by Cosmic Rays. Science 121: 451-453.

Eisenbud, M. 1963. Environmental Radioactivity, McGraw-Hill, New York, New York, pp. 213, 275, and 276.

Gold, S., H. W. Barkhau, B. Shlein, and B. Kahn, 1964 Measurement of Naturally Occurring Radionuclides in Air, in the Natural Radiation* Environment, University of Chicago Press, Chicago, Illinois, 369-382.

ATI Environmental, Inc., Midwest Laboratory.

____ 2001 to 2018. Annual Report. Radiological Monitoring Program for the Kewaunee Power Station, Kewaunee, Wisconsin, Final Report, Part II, Data Tabulations and Analysis, January - December 2000 -2016.

____ 1984 to 2000. (formerly Teledyne Brown Engineering Environmental Services, Midwest Laboratory)

Annual Reports. Radiological Monitoring Program for the Kewaunee Power Station, Kewaunee, Wisconsin, Final Report, Part 11, Data Tabulations and Analysis, January - December 1983 through January - December 1999.

____ 1979 to 1983.

(formerly Hazleton Environmental Sciences Corporation) Annual Reports.

Radiological MoQitoring for the Kewaunee Power Station, Kewaunee, Wisconsin, Final Report - Part II, Data Tabulations and Analysis, january-December, 1978 through 1982.

• ____ 1977 to 1978. (formerly NALCO Environmental Sciences Corporation)

Annual Reports.

Radiological Monitoring for the Kewaunee Power Station, Kewaunee, Wisconsin, Final Report - Part II, Data Tabulations and Analysis, January-December, 1976 to 1977.

_....2018.

Quality Manual, Rev. 6, 20 July 2018.

---

~2020.

Quality Control Procedures Manual, Rev. 4, 15 January 2020.

---

~20~2.

Quality Assurance Program Manual, Rev. 3, 14 November 2012.

---

~2009.

Quality Control Program, Rev. 2, 12 November 2009.

Industrial BIO-TEST Laboratories, Inc. 1974.

Annual Report.

Pre-operational Radiological Monitoring Program for the Kewaunee Power Station. Kewaunee, Wisconsin. January-December 1973.

Industrial BIO-TEST Laboratories, Inc. 1975. Semi-annual Report. Radiological Monitoring Program for the Kewaunee Power Station, Kewaunee, Wisconsin. Jan. - June, 1975.

Kewaunee Power Station. 2019. Radiological Environmental Monitoring Manual (REMM). Revision 22, 01 April 2019 National Center for Radiological Health. 1968. Section 1. Milk Surveillance. Radiological Health Data Rep., December 9:

730-746.

National Council on Radiation Protection and Measurements. 1975. Natural Radiation Background in the United States.

NCRP Report No. 45.

Solon, L. R., W. M. Lowder, A. Shambron, and H. Blatz. 1960. Investigations of Natural Environmental Radiation. Science.

131: 903-906.

U.S. Environmental Protection Agency, 2007.

RadNet, formerly Environmental.Radiation Ambient Monitoring System, Gross Beta in Air (WI) 1981 - 2000.

Wilson, D.W., G. M. Ward, and J.E. Johnson, 1969. Environmental Contamination by Radioactive Materials. International Atomic Energy Agency, p. 125 American National Standards Institute/Health Physics Society (ANSI/HPS) N13.37 - 2014, Environmental Dosimetry-Criteria for System Design and Implementation.

25

NOTE:

APPENDIX A INTERLABORATORY AND INTRALABORATORY COMPARISON PROGRAM RESULTS Appendix A is updated four times a year. The complete appendix is included in March, June, September and December monthly progress reports only.

January, 2020 through December, 2020

"Appendix A lnterlaboratory/ lntralaboratory Comparison Program Results Environmental, Inc., Midwest Laboratory has participated in interlaboratory comparison (crosscheck) programs since the formulation of its quality control program in December 1971. These programs are operated by agencies which supply environmental type samples containing concentrations of radionuclides known to the issuing agency but not to participant laboratories. The purpose of such a program is to provide an independent check on a laboratory's analytical procedures and to alert it of any possible problems.

Participant laboratories measure the concentration of specified radionuclides and report them to the issuing agency. Several months later, the agency reports the known values to the participant laboratories and specifies control limits. Results consistently higher or lower than the known values or outside the control limits indicate a need to check the instruments or procedures used.

Results in Table A-1 were obtained through participation in the RAD PT Study Proficiency Testing Program administered by Environmental Resource Associates, serving as a replacement for studies conducted previously by the U.S. EPA Environmental Monitoring Systems Laboratory, Las Vegas, Nevada.

Results in Table A-2 were obtained through participation in the New York Department of Health Environmental Laboratory Approval Program (ELAP) PT.

Table A-3 lists results for thermoluminescent dosimeters (TLDs), via irradiation and evaluation by the University of Wisconsin-Madison Radiation Calibration Laboratory at the University of Wisconsin Medical Radiation Research Center.

Table A-4 lists results of the analyses on intralaboratory "spiked" samples for the past twelve months. All samples are prepared using NIST traceable sources. Data for previous years available upon request.

Table A-5 lists results of the analyses on intralaboratory "blank" samples for the past twelve months. Data for previous years available upon request.

Table A-6 lists analytical results from the intralaboratory "duplicate" program for the past twelve months. Acceptance is based on each result being within 25% of the mean of the two results or the two sigma uncertainties of each result overlap.

The results in Table A-7 were obtained through participation in the Mixed Analyte Performance Evaluation Program.

Results in Table A-8 were obtained through participation in the MRAD PT Study Proficiency Testing Program administered by Environmental Resource Associates, serving as a replacement for studies conducted previously by the Environmental Measurement Laboratory Quality Assessment Program (EML).

Attachment A lists the laboratory acceptance criteria for various analyses.

Out-of-limit results are explained directly below the result.

A-1

Attachment A ACCEPTANCE CRITERIA FOR INTRALABORATORY "SPIKED" SAMPLES Analysis Ratio of lab result to known value.

Gamma Emitters 0.8 to 1.2 Strontium-89, Strontium-90 0.8 to 1.2 Potassium-40 0.8 to 1,2 Gross alpha 0.5 to 1.5 Gross beta 0.8 to 1.2 i *

• Tritium 0.8 to 1.2 Radium-226, 0.7to1.3 Radium-228 Plutonium 0.8 to 1.2 lodine-129, lodine-131 0.8 to 1.2 Nickel-63, 0.7to1.3 Technetium-99, Uranium-238 lron-55 0.8 to 1.2 Other Analyses 0.8 to 1.2 A-2

TABLEA-1. lnterlaboratory Comparison Crosscheck program, Environmental Resource Associates (ERA)".

RAD study Concentration (pCi/L)

Lab Code Date Analysis Laboratory ERA Control Result Result Limits Acceptance RAD-120 Study ERW-49 1/6/2020 Ba-133 60.8 +/- 4.4 64.5 53.7 - 71.0 Pass ERW-49 1/6/2020 Cs-134 22.7 +/- 2.8 22.9 17.5 - 25.6 Pass ERW-49 1/6/2020 Cs-137 225 +/-8 220 198 -244 Pass ERW-49 1/6/2020 Co-60 94.6 +/-4.6 91.2 82.1 -103 Pass ERW-49 1/6/2020 Zn-65 331 +/- 13 298 268 - 348 Pass ERDW-51 1/6/2020 Gr. Alpha 52.3 +/- 2.4 58.9 30.8 - 73.3 Pass ERDW-51 1/6/2020 Gr. Beta 19.9 +/- 1.0 21.0 12.6 - 29.1 Pass ERDW-53 1/6/2020 Ra-226 12.8 +/- 0.5 17.4 12.9 -19.9 Failb ERDW-53 1/6/2020 Ra-228 7.13 +/- 0.9 7.95 5.06 -10.1 Pass ERDW-53 1/6/2020 Uranium 63.8 +/- 1.0 68.2 55.7 - 75.0 Pass ERW-55 1/6/2020 H-3 18,200 +/- 408 17,800 15,600 -19,600 Pass RAD-121 Study ERDW-1034 4/6/2020 Ra-226 17.8 +/- 0.5 18.4 13.7 - 21.0 Pass ERDW-1034 4/6/2020 Ra-228 6.30 +/- 0.86 5.81 3.56 - 7.64 Pass ERDW-1034 4/6/2020 Uranium 18.7 +/- 1.3 18.6 14.9 - 20.9 Pass RAD-122 Study ERW-2297 7/6/2020 Ba-133 43.8 +/- 3.4 58.6 48.6 -64.6 Failc ERW-2297 7/6/2020 Cs-134 19.8 +/- 2.4 22.3 17.0 -25.0 Pass ERW-2297 7/6/2020 Cs-137 73.2 +/- 5.4 73.0 65.7 - 83.0 Pass ERW-2297 7/6/2020 Co-60 90.0 +/-4.0 86.1 77.5 - 97.0 Pass ERW-2297 7/6/2020 Zn-65 84.9 +/-7.5 82.9 74.6 - 99.6 Pass ERDW-2299 7/6/2020 Gr. Alpha 40.3 +/-2.2 52.40 27.30 - 65.6 Pass ERDW-2299 7/6/2020 Gr. Beta 19.9 +/- 1.0 24.3 15.0 - 32.3 Pass ERDW-2303 7/6/2020 Ra-226 8.91 +/- 0.43 10.8 8.08 -12.5 Pass ERDW-2303 7/6/2020 Ra-228 4.79 +/- 0.80 5.42 3.28 - 7.19 Pass ERDW-2303 7/6/2020 Uranium 27.7 +/- 0.9 29.3 23.7 - 32.5 Pass ERW-2305 7/6/2020 H-3 21,100 +/-400 20,300 17,800 -22,300 Pass ERW-2301 7/6/2020 1-131 27.8 +/- 1.2 26.1 21.7 - 30.8 Pass

• Results obtained by Environmental, Inc., Midwest Laboratory as a participant in the crosscheck program for proficiency testing in drinking water conducted by Environmental Resource Associates (ERA).

b Ra-226 was slightly below the lower limit of the study. The reported value was the mean of two results (12.5 & 13.0).

The sample was re-run in duplicate and both results, 15.6 and 13.8 pCi/L, were within the acceptance band.

0 Ba-133 was below the lower acceptable limit of the study. No cause for the failure could be identified. Going forward gamma results will be monitored to see if any trend develops.

A-3

e * * * * * * * * * * * * * * * * * *

• TABLE A-2. lnterlaboratory Comparison Crosscheck program, New York Department of Health (ELAP)a_

Concentration (pCi/L)

Lab Code Date Analysis Laboratory Assigned Acceptance Result Value Limits Acceptance Shipment 437R NYW-3307 9/15/2020 H-3 11,500 +/-465 11,208 9760 - 12,300 Pass NYW-3331 9/15/2020 Gross Alpha 43.7 +/- 2.5 64.9 34.0 -80.4 Pass NYW-3331 9/15/2020 Gross Beta 11.1 +/- 1.1 8.85 3.62 - 17.4 Pass NYW-3335 9/15/2020 1-131 14.1 +/- 1.4 12.6 10.3 -16.0 Pass NYW-3333 9/15/2020 Ra-226 2.24 +/- 0.27 2.63 2.06 - 3.44 Pass NYW-3333 9/15/2020 Ra-228 4.91 +/- 1.12 5.41 3.27 - 7.18 Pass NYW-3333 9/15/2020 Uranium 42.8 +/- 1.94 37.1 30.1 -41.0 Failb NYW-3337 9/15/2020 Co-60 46.4 +/- 3.8 42.3 38.1 -49.2 Pass NYW-3337 9/15/2020 Zn-65 133 +/- 9 116 104 -138 Pass NYW-3337 9/15/2020 Ba-133 49.5 +/- 4.1 46.4 38.0 - 51.6 Pass NYW-3337 9/15/2020 Cs-134 32.5 +/- 3.1 33.0 26.0 - 36.3 Pass NyYV-3337 9/15/2020 Cs-137 147 +/-7 134 121 -150 Pass

• Results obtained by Environmental, Inc., Midwest Laboratory as a participant in the crosscheck program for proficiency testing in drinking water conducted by the New York Department of Health Laboratory Approval Program(NY ELAP).

b Lab passed all ERA and MAPEP studies for uranium in 2020.(See tables A-1, A-7 and A-8) Uncertainty overlapped upper acceptance limit. Lab will continue to monitor results going forward for trends.

A-4

TABLE A-3. Thermoluminescent Dosimetry, (TLD, CaSO4: Dy Cards).

8 mrem Lab Code Irradiation Delivered Reportedb Performancec Date Description Dose Dose Quotient (P)

Environmental. Inc.

Group 1 2020-1 10/28/2020 Spike 1 172.0 180.0 0.05 2020-1 10/28/2020 Spike 2 172.0 174.5 0.01 2020-1 10/28/2020 Spike 3 172.0 174.3 0.01 2020-1 10/28/2020 Spike 4 172.0 174.0 0.01 2020-1 10/28/2020 Spike 5 172.0 167.1

-0.03 2020-1 10/28/2020 Spike 6 172.0 161.9

-0.06 2020-1 10/28/2020 Spike 7 172.0 167.9

-0.02 2020-1 10/28/2020 Spike 8 172.0 171.0

-0.01 2020-1 10/28/2020 Spike 9 172.0 170.7

-0.01 2020-1 10/28/2020 Spike 10 172.0 170.1

-0.01 2020-1 10/28/2020 Spike 11 172.0 173.8 0.01 2020-1 10/28/2020 Spike 12 172.0 178.3 0.04 2020-1 10/28/2020 Spike 13 172.0 178.2 0.04 2020-1 10/28/2020 Spike 14 172.0 171.9 0.00 2020-1 10/28/2020 Spike 15 172.0 190.4 0.11 2020-1 10/28/2020 Spike 16 172.0 170.9

-0.01 2020-1 10/28/2020 Spike 17 172.0 183.3 0.07 2020-1 10/28/2020 Spike 18 172.0 170.6

-0.01 2020-1 10/28/2020 Spike 19 172.0 164.9

-0.04 2020-1 10/28/2020 Spike 20 172.0 175.7 0.02 Mean (Spike 1-20).

173.5 0.01 Passd Standard Deviation (Spike 1-20) 6.5 0.04 Passd a TLD's were irradiated by the University of Wisconsin-Madison Radiation Calibration Laboratory following ANSI N13.37 protocol from a known air kerma rate. TLD's were read and the results were submitted by Environmental Inc. to the University of Wisconsin-Madison Radiation Calibration Laboratory for comparison to the delivered dose.

b Reported dose was converted from exposure (R) to Air Kerma (cGy) using a conversion of 0.876. Conversion from air kerma to ambient dose equivalent for Cs-137 at the reference dose point H*(10)Ka = 1.20. mrem/cGy = 1000.

c Performance Quotient (P) is calculated as ((reported dose - conventionally true value) + conventionally true value) where the conventionally true value is the delivered dose.

d Acceptance is achieved when neither the absolute value of the mean of the P values, nor the standard deviation of the P values exceed 0.15.

A-5

• * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -~ * * * * * **

1*

e I * * * * * * * * *

• TABLE A-3. Thermoluminescent Dosimetry, (TLD, CaSO4: Dy Cards).

8 mrem Lab Code Irradiation Delivered Reportedb Performance 0

Date Description Dose Dose Quotient (P)

Environmental, Inc.

Group 2 2020-2 10/28/2020 Spike 21 114.0 117.3 0.03 2020-2 10/28/2020 Spike 22 114.0 103.3

-0.09 2020-2 10/28/2020 Spike 23 114.0 106.2

-0.07 2020-2 10/28/2020 Spike 24 114.0 110.1

-0.03 2020-2 10/28/2020 Spike 25 114.0 114.9 0.01 2020-2 10/28/2020 Spike 26 114.0 115.5 0.01 2020-2 10/28/2020 Spike 27 114.0 110.4

-0.03 2020-2 10/28/2020 Spike 28 114.0 111.7

-0.02 2020-2 10/28/2020 Spike 29 114.0 111.3

-0.02 2020-2 10/28/2020 Spike 30 114.0 113.1

-0.01 2020-2 10/28/2020 Spike 31 114.0 116.4 0.02 2020-2 10/28/2020 Spike 32 114.0 111.8

-0.02 2020-2 10/28/2020 Spike 33 114.0 112.6

-0.01 2020-2 10/28/2020 Spike 34 114.0 105.7

-0.07 2020-2 10/28/2020 Spike 35 114.0 104.5

-0.08 2020-2 10/28/2020 Spike 36 114.0 103.6

-0.09 2020-2 10/28/2020 Spike 37 114.0 104.4

-0.08 2020-2 10/28/2020 Spike 38 114.0 104.5

-0.08 2020-2 10/28/2020 Spike 39 114.0 106.4

-0.07 2020-2 10/28/2020 Spike 40 114.0 107.7

-0.06 Mean (Spike 21-40) 109.6

-0.04 Passct Standard Deviation (Spike 21-40) 4.6 0.04 Passct a TLD's were irradiated by the University of Wisconsin-Madison Radiation Calibration Laboratory following ANSI N13.37 protocol from a known air kerma rate. TLD's were read and the results were submitted by Environmental Inc. to the University of Wisconsin-Madison Radiation Calibration Laboratory for comparison to the delivered dose.

b Reported dose was converted from exposure (R) to Air Kerma (cGy) using a conversion of 0.876. Conversion from air kerma to ambient dose equivalent for Cs-137 at the reference dose point H*(1 0)Ka = 1.20. mrem/cGy = 1000.

c Performance Quotient (P) is calculated as ((reported dose - conventionally true value) s-conventionally true value) where the conventionally true value is the delivered dose.

d Acceptance is achieved when neither the absolute value of the mean of the P values, nor the standard deviation of the P values exceed 0.15.

A-6

TABLE A-4. lntralaboratory "Spiked" Samples Concentration*

Lab Codeb Date Analysis Laboratory results Known Control Ratio 2s, n=1° Activity Limitsd Acceptance Lab/Known SPW-481 1/1/2020 Ra:226 10.4 +/- 0.3 12.3 8.6 - 16.0 Pass 0.85 SPW-110 1/16/2020 H-3 2,101 +/- 154 2,110 1,688 - 2,532 Pass 1.00 W-041620 4/29/2016 Cs-134 35.7 +/- 8.8 36.2 29.0 - 43.4 Pass 0.99 W-041620 4/29/2016 Cs-137 75.0 +/- 6.6 71.9 57.5 - 86.3 Pass 1.04 W-042020 4/29/2016 Cs-134 40.6 +/- 10.2 36.2 29.0 -43.4 Pass 1.12 W-042020 4/29/2016 Cs-137 71.2 +/- 7.0 71.9 57.5 -86.3 Pass 0.99 SPW-190 1/23/2020 H-3 2,058 +/- 153 2,110 1,688 - 2,532 Pass 0.98 SPW-205 1/28/2020 Sr-90 17.6 +/- 1.2 17.9 14.3 - 21.5 Pass 0.99 SPW-217 1/31/2020 H-3 2,005 +/- 152 2,110 1,688 - 2,532 Pass 0.95 SPW-270 2/7/2020 H-3 2,153 +/- 157 2,110 1,688 - 2,532 Pass 1.02 SPW-288 2/11/2020 Ra-228 13.1 +/- 1.7 14.9 10.4-19.3 Pass 0.88 W-021220 4/29/2016 Cs-134 39.3 +/- 18.9 36.2 29.0 - 43.4 Pass 1.09 W-021220 4/29/2016 Cs-137 73.9 +/- 15.8 71.9 57.5 -86.3 Pass 1.03 SPW-396 2/14/2020 H-3 2,298 +/- 160 2,110 1,688 - 2,532 Pass 1.09 W-022420 4/29/2016 Cs-134 33.4 +/- 10.5 36.2 29.0 - 43.4 Pass 0.92 W-022420 4/29/2016 Cs-137 75.6 +/- 7.8 71.9 57.5 -86.3 Pass 1.05 SPW-716 2/26/2020 Ra-226 11.3 +/- 0.4 12.3 8.6 - 16.0 Pass 0.92 W-022820 4/29/2016 Cs-134 34.9 +/- 11.6 36.2 29.0 -43.4 Pass 0.96 W-022820 4/29/2016 Cs-137 82.9 +/- 8.5 71.9 57.5 - 86.3 Pass 1.15 SPW-532 2/28/2020 H-3 2,054 +/- 153 2,110 1,688 - 2,532 Pass 0.97 W-030420 4/29/2016 Cs-134 29.7 +/- 9.6 36.2 29.0 - 43.4 Pass 0.82 W-030420 4/29/2016 Cs-137 74.2 +/- 7.3 71.9 57.5 - 86.3 Pass 1.03 W-031020 4/29/2016 Cs-134 41.6 +/- 17.8 36.2 29.0 -43.4 Pass 1.15 W-031020 4/29/2016 Cs-137 78.6 +/- 14.3 71.9 57.5 -86.3 Pass 1.09 SPW-711 3/12/2020 H-3 2,083 +/- 154 2,110 1,688 - 2,532 Pass 0.99 SPW-825 3/12/2020 Ra-226 12.4 +/- 0.4 12.3 8.6 - 16.0 Pass 1.01 SPW-774 3/18/2020 H-3 2,021 +/- 151 2,110 1,688 - 2,532 Pass 0.96 W-031820 4/29/2016 Cs-134 29.7 +/- 10.6 36.2 29.0 -43.4 Pass 0.82 W-031820 4/29/2016 Cs-137 75.5 +/- 9.2 71.9 57.5 - 86.3 Pass 1.05 W-032520 4/29/2016 Cs-134 36.4 +/- 9.2 36.2 29.0 - 43.4 Pass 1.01 W-032520 4/29/2016 Cs-137 74.9 +/- 7.0 71.9 57.5 - 86.3 Pass 1.04 SPW-877 3/31/2020 Ra-228 13.0 +/- 2.0 14.9 10.4-19.3 Pass 0.88 SPW-925 3/23/2020 Ra-226 10.7 +/-0.4 12.3 8.6 - 16.0 Pass 0.87 SPW-859 3/27/2020 H-3 2,065 +/- 153 2,110 1,688 - 2,532 Pass 0.98 W-040320 4/29/2016 Cs-134 38.1 +/- 10.3 36.2 29.0 - 43.4 Pass 1.05 W-040320 4/29/2016 Cs-137 78.6 +/- 7.5 71.9 57.5 - 86.3 Pass 1.09 SPDW-1009 4/8/2020 Gr. Alpha 11.5 +/- 0.9 18.7 9.4 - 28.1 Pass 0.61 SPDW-1009 4/8/2020 Gr. Beta 22.0 +/- 1.0 26.1 20.9 - 31.3 Pass 0.84 SPW-1033 4/9/2020 H-3 2,041 +/- 153 2,110 1,688 - 2,532 Pass 0.97 W-040920 4/29/2016 Cs-134 34.3 +/- 9.4 36.2 29.0 -43.4 Pass 0.95 W-040920 4/29/2016 Cs-137 77.9 +/- 8.0 71.9 57.5 - 86.3 Pass 1.08 SPW-1145 4/15/2020 Ra-228 14.3 +/-2.0 14.9 10.4 -19.3 Pass 0.96 SPW-1186 4/17/2020 H-3 1,972 +/- 151 2,110 1,688 - 2,532 Pass 0.93

• Liquid sample results are reported in pCi/Liter, air filters ( pCi/m3), charcoal (pCi/charcoal canister), and solid samples (pCi/kg).

b Laboratory codes: W & SPW (Water), Ml (milk), AP (air filter), SO (soil), VE (vegetation), CH (charcoal canister), F (fish), U (urine).

c Results are based on single determinations.

d Acceptance criteria are listed in Attachment A of this report.

A-7

TABLE A-4. lntralaboratory "Spiked" Samples Concentration" Lab Codeb Date Analysis Laboratory results Known Control Ratio 2s, n=1° Activity Limitsd Acceptance Lab/Known SPW-1284 4/24/2020 H-3 2,015 +/- 153 2,110 1,688 - 2,532 Pass 0.95 SPW-1745 4/24/2020 Ra-226 11.9 +/- 0.3 12.3 8.6 - 16.0 Pass 0.97 W-042220 4/29/2016 Cs-134 33.7 +/- 9.2 36.2 29.0 - 43.4 Pass 0.93 W-042220 4/29/2016 Cs-137 74.9 +/- 6.6 71.9 57.5 - 86.3 Pass 1.04 W-042420 4/29/2016 Cs-134 33.3 +/- 10.8 36.2 29.0 - 43.4 Pass 0.92 W-042420 4/29/2016 Cs-137 73.7 +/- 8.5 71.9 57.5 - 86.3 Pass 1.03 W-043020 4/29/2016 Cs-134 33.7 +/- 15.7 36.2 29.0 - 43.4 Pass 0.93 W-043020 4/29/2016 Cs-137 72.5 +/- 7.1 71.9 57.5 - 86.3 Pass 1.01 SPW-1327 5/1/2020 H-3 2,071 +/- 153 2,110 1,688 - 2,532 Pass 0.98 W-050520 4/29/2016 Cs-134 31.1 +/- 11.9 36.2 29.0 - 43.4 Pass 0.86 W-050520 4/29/2016 Cs-137 73.2 +/- 8.3 71.9 57.5 - 86.3 Pass 1.02 SPW-1394 5/5/2020 Sr-90 18.1+/-1.1 17.9 14.3 - 21.5 Pass 1.01 W-050720 4/29/2016 Cs-134 39.9 +/- 2.0 36.2 29.0 - 43.4 Pass 1.10 W-050720 4/29/2016 Cs-137 75.2 +/- 14.3 71.9 57.5 - 86.3 Pass 1.05 SPW-1500 5/18/2020 Ra-228 13.8 +/- 1.9 14.9 10.4 - 19.3 Pass 0.93 W-052020 4/29/2016 Cs-134 33.1 +/- 1.2 36.2 29.0 - 43.4 Pass 0.91 W-052020 4/29/2016 Cs-137 80.8 +/- 8.3 71.9 57.5 - 86.3 Pass 1.12 SPW-1613 5/22/2020 H-3 1,953 +/- 149 2,110 1,688 - 2,532 Pass 0.93 W-052620 4/29/2016 Cs-134 31.0 +/- 9.2 36.2 29.0 - 43.4 Pass 0.86 W-052620 4/29/2016 Cs-137 74.6 +/- 7.5 71.9 57.5 - 86.3 Pass 1.04 SPW-2061 5/21/2020 Ra-226 10.4+/-0.3 12.3 8.6 - 16.0 Pass 0.85 W-052620 4/29/2016 Cs-134 33.6 +/- 12.8 36.2 29.0 - 43.4 Pass 0.93 W-052620 4/29/2016 Cs-137 69.2 +/- 7.7 71.9 57.5 - 86.3 Pass 0.96 SPW-1741 5/27/2020 H-3 1,925 +/- 150 2,110 1,688 - 2,532 Pass 0.91 SPW-1824 6/3/2020 H-3 1,971 +/- 151 2,110 1,688 - 2,532 Pass 0.93 SPW-1853 6/4/2020 H-3 2,027 +/- 153 2,110 1,688 - 2,532 Pass 0.96 W-061120 4/29/2016 Cs-134 39.8 +/- 21.0 36.2 29.0 - 43.4 Pass 1.10 1e W-061120 4/29/2016 Cs-137 79.3 +/- 13.5 71.9 57.5 - 86.3 Pass 1.10 SPW"1982 6/12/2020 H-3 2,065 +/- 154 2,110 1,688 - 2,532 Pass 0.98 SPW-2038 6/18/2020 H-3 2,012 +/- 154 2,110 1,688 - 2,532 Pass 0.95 SPW-2116 6/25/2020 H-3 2,051 +/- 159 2,110 1,688 - 2,532 Pass 0.97 SPW-2173 7/1/2020 H-3 2,010 +/- 154 2,110 1,688 - 2,532 Pass 0.95 SPW-2328 7/10/2020 H-3 1,924 +/- 151 2,110 1,688 - 2,532 Pass 0.91 SPW-2458 7/16/2020 H-3 1,932 +/- 151 2,110 1,688 - 2,532 Pass 0.92 SPW-2556 7/27/2020 Sr-90 16.8+/-1.1 17.9 14.3-21.5 Pass 0.94 SPW-2558 7/6/2020 Gr. Alpha 29.9 +/- 2.1 58.9 29.5 - 88.4 Pass 0.51 SPW-2558 7/6/2020 Gr. Beta 20.0 +/- 1.0 21.0 16.8 - 25.2 Pass 0.95 SPW-2640 7/31/2020 H-3 1,984 +/- 154 2,110 1,688 - 2,532 Pass 0.94 SPW-2778 8/7/2020 H-3 1,936 +/- 151 2,110 1,688 - 2,532 Pass 0.92 SPW-2797 6/22/2020 Ra-226 10.4+/-0.3 12.3 8.6 - 16.0 Pass 0.85 SPW-2852 8/11/2020 Ra-228 10.2 +/- 1.6 12.5 8.7 - 16.2 Pass 0.82

• Liquid sample results are reported in pCi/Liter, air filters ( pCi/m3), charcoal (pCi/charcoal canister), and solid samples (pCi/kg).

b Laboratory codes : W & SPW (Water), Ml (milk), AP (air filter), SO (soil), VE (vegetation), CH (charcoal canister), F (fish), U (urine).

0 Results are based on single determinations.

d Acceptance criteria are listed in Attachment A of this report.

A-8

TABLE A-4. lntralaboratory "Spiked" Samples Concentration*

Lab Codeb Date Analysis Laboratory results Known Control Ratio 2s,n=1° Activity Limitsd Acceptance Lab/Known' SPW-2854 8/14/2020 H-3 1,927 +/- 153 2,110 1,688 - 2,532 Pass 0.91 SPW-2890 8/4/2020 Ra-226 11.6 +/- 0.4 12.3 8.6 - 16.0 Pass 0.95 SPW-3013 8/24/2020 H-3 2,005 +/- 153 2,110 1,688 - 2,532 Pass 0.95 SPW-3053 8/28/2020 H-3 1,904 +/- 149 2,110 1,688 - 2,532 Pass 0.90 SPW-3123 8/19/2020 Ra-226 10.4 +/- 0.3 12.3 8.6 -16.0 Pass 0.85 SPW-3447 9/3/2020 Ra-226 9.8 +/- 0.3 12.3 8.6 - 16.0 Pass 0.80 SPW-3241 9/11/2020 H-3 1,952 +/- 154 2,110 1,688 - 2,532 Pass 0.93 SPW-3425 9/23/2020 Ra-228 10.7+/-1.6 12.3 8.6 - 16.0 Pass 0.87 SPW-3412 9/25/2020 H-3 2,099 +/- 155 2,110 1,688 - 2,532 Pass 0.99 SPW-4131 9/30/2020 Ra-226 13.2 +/- 0.4 12.3 8.6 -16.0 Pass 1.07 SPW-3482 10/2/2020 H-3 1,984 +/- 154 2,110 1,688 ~ 2,532 Pass 0.94 SPW-3624 10/9/2020 H-3 1,924 +/- 152 2,110 1,688 - 2,532 Pass 0.91 SPW-3794 10/16/2020 H-3 2,109+/-156 2,110 1,688 - 2,532 Pass 1.00 SPW-3836 10/20/2020 Sr-90 16.8+/-1.1 17.9 14.3 - 21.5 Pass 0.94 SPW-4043 10/23/2020 H-3 1893.4 +/- 148.8 2,110 1,6?8 - 2,532 Pass 0.90 SPW-4179 10/28/2020 Ra-228 15.4 +/- 2.4 12.1 8.5 - 15.7 Pass 1.27 SPW-4422 10/30/2020 Ra-226 12.3 +/- 0.3 12.3 8.6 - 16.0 Pass 1.00 SPW-4234 11/11/2020 H-3 2,008 +/- 154 2,110 1,688 - 2,532 Pass 0.95 SPW-4634 11/23/2020 Ra-226 11.4 +/- 0.3 12.3 8.6 - 16.0 Pass 0.93 SPW-4509 12/4/2020 H-3 1,873 +/- 149 2,110 1,688 - 2,532 Pass 0.89 SPW-4625 12/18/2020 H-3 1,940 +/- 152 2,110 1,688 - 2,532 Pass 0.92 SPW-4741 12/18/2020 Ra-226 12.5 +/- 0.4 12.3 8.6 -16.0 Pass 1.02

• Liquid sample results are reported in pCi/Liter, air filters ( pCi/m3), charcoal (pCi/charcoal canister), and solid samples (pCi/kg).

b Laboratory codes : W & SPW (Water), Ml (milk), AP (air filter), SO (soil), VE (vegetation), CH (charcoal canister), F (fish), U (urine).

0 Results are based on single determinations.

d Acceptance criteria are listed in Attachment A of this report.

A-9

TABLE A-5. lntralaboratory "Blank" Samples Concentration" Lab Codeb Sample Date Analysis 0

Laboratory results (4.66cr)

Acceptance Type LLD Activity Criteria (4.66 cr)

SPW-480 Water 1/1/2020 Ra-226 0.03 0.12 +/- 0.02 2

SPW-93 Water 1/7/2020 Gr. Alpha 0.35 0.47 +/- 0.29 2

SPW-93 Water 1/7/2020 Gr. Beta 0.74 0.18 +/- 0.53 4

SPW-109 Water 1/16/2020 H-3 157

-6 +/- 73 200 SPW-154 Water 1/16/2020 1-131 0.47

-0.22 +/- 0.21 SPW-189 Water 1/23/2020 H-3 158 0 +/- 73 200 SPW-204 Water 1/28/2020 Sr-89 0.64

-0.16 +/- 0.50 5

SPW-204 Water 1/28/2020 Sr-90 0.54 0.11 +/- 0.27 SPW-216 Water 1/31/2020 H-3 156 86 +/- 78 200 SPW-269 Water 2/7/2020 H-3 153 79 +/- 80 200 SPW-287 Water 2/11/2020 Ra-228 0.81 1.49 +/- 0.53 2

SPW-395 Water 2/14/2020 H-3 154 46 +/- 75 200 SPW-463 Water 2/25/2020 1-131 0.16 0.02 +/- 0.09 1

SPW-715 Water 2/26/2020 Ra-226 0.01 0.17 +/- 0.01 2

SPW-531 Water 2/28/2020 H-3 156 44 +/- 75 200 SPW-710 Water 3/12/2020 H-3 157

-16 +/- 72 200 SPW-824 Water 3/12/2020 Ra-226 0.03 0.15 +/- 0.03 2

SPW-773 Water 3/18/2020 H-3 151 76 +/- 76 200 SPW-876 Water 3/31/2020 Ra-228 0.88 0.57 +/- 0.47 2

SPW-924 Water 3/23/2020 Ra-226 0.04 0.18 +/- 0.03 2

SPW-1032 Water 4/9/2020 H-3 157 68 +/- 77 200 SPW-1144 Water 4/15/2020 Ra-228 0.89 0.03 +/- 0.42 2

SPW-1185 Water 4/17/2020 H-3 158 8 +/- 74 200 SPW-1283 Water 4/24/2020 H-3 156 10 +/- 75 200 SPW-1744 Water 4/24/2020 Ra-226 0.03

-0.01 +/- 0.03 2

SPW-1326 Water 5/1/2020 H-3 153 67 +/- 75 200 SPW-1393 Water 5/5/2020 Sr-89 0.66 0.11 +/- 0.44 5

SPW-1393 Water 5/5/2020 Sr-90 0.63

-0.27 +/- 0.26 SPW-1499 Water 5/18/2020 Ra-228 0.88 0.03 +/- 0.41 2

SPW-1541 Water 5/19/2020 1-131 0.20 0.00 +/- 0.11 SPW-2060 Water 5/21/2020 Ra-226 0.03

-0.01 +/- 0.02 2

SPW-1612 Water 5/22/2020 H-3 153 91 +/- 76 200 SPW-1740 Water 5/27/2020 H-3 158

-26 +/- 71 200 SPW-1823 Water 6/3/2020 H-3 157 18 +/- 74 200 SPW-1852 Water 6/4/2020 H-3 159 33 +/- 76 200 SPW-1981 Water 6/12/2020 H-3 149 52 +/- 77 200 SPW-2037 Water 6/18/2020 H-3 156 101 +/- 81 200 SPW-2115 Water 6/25/2020 H-3 158 56 +/- 86 200

• Liquid sample results are reported in pCi/Liter, air filters ( pCitm\\ charcoal (pCi/charcoal canister), and solid samples (pCi/g).

b Laboratory codes : W & SPW (Waler), Ml (milk), AP (air filter), SO (soil), VE (vegetation), CH (charcoal canister), F (fish), U (urine).

c 1-131 (G); iodine-131 as analyzed by gamma spectroscopy.

d Activity reported is a net activity result.

A-10

TABLE A-5. lntralaboratory "Blank" Samples Concentration" Lab Codeb Sample Date Analysis 0

Laboratory results (4.66cr)

Acceptance Type LLD Activity Criteria (4.66 cr)

SPW-2172 Water 7/1/2020 H-3 159

-15 +/- 75 200 SPW-2327 Water 7/10/2020 H-3 158 50 +/- 77 200 SPW-2457 Water 7/16/2020 H-3 159

-46 +/- 71 200 SPW-2555 Water 7/27/2020 Sr-89 0.48 0.18 +/- 0.40 5

SPW-2555 Water 7/27/2020 Sr-90 0.54 0.03 +/- 0.25 SPW-2557 Water 7/6/2020 Gr. Alpha 0.37 0.25 +/- 0.28 2

SPW-2557 Water 7/6/2020 Gr. Beta 0.75

-0.23 +/- 0.52 4

SPW-2639 Water 7/31/2020 H-3 158 80 +/- 81 200 SPW-2777 Water 8nt2020 H-3 157 0 +/-74 200 SPW-2796 Water 6/22/2020 Ra-226 0.03

-0.02 +/- 0.03 2

SPW-2851 Water 8/11/2020 Ra-228 0.85 0.44 +/- 0.45 2

SPW-2853 Water 8/14/2020 H-3 158 18 +/- 77 200 SPW-2880 Water 8/18/2020 1-131 0.42

-0.04 +/- 0.22 SPW-2889 Water 8/4/2020 Ra-228 0.05 0.13 +/- 0.11 2

SPW-3012 Water 8/24/2020 H-3 159 59 +/-77 200 SPW-3052 Water 8/28/2020 H-3 155 46 +/-75 200 SPW-3122 Water 9/3/2020 Ra-226 0.03 0.20 +/- 0.03 2

SPW-3240 Water 9/11/2020 H-3 161 3 +/- 78 200 SPW-3446 Water 9/3/2020 Ra-226 0.01 0.12 +/- 0.02 2

SPW-3424 Water 9/23/2020 Ra-228 0.85 0.81 +/- 0.48 2

SPW-3411 Water 9/25/2020 H-3 158 82 +/- 78 200 SPW-4130 Water

. 9/30/2020 Ra-226 0.04 0.01 +/- 0.04 2

SPW-3481 Water 10/2/2020 H-3 154 63 +/- 80 200 SPW-3623 Water 10/9/2020 H-3 156 57 +/- 81 200 SPW-3793 Water 10/16/2020 H-3 157 3 +/- 73 200 SPW-3835 Water 10/20/2020 Sr-89 0.55

-0.10 +/- 0.43 5

SPW-3835 Water 10/20/2020 Sr-90 0.59 0.09 +/- 0.28 1

SPW-4042 Water 10/23/2020 H-3 155

-6 +/- 72 200 SPW-4178 Water 10/28/2020 Ra-228 1.04 0.33 +/- 0.52 2

SPW-4421 Water 10/30/2020 Ra-226 0.03 0.07 +/- 0.03 2

SPW-4233 Water 11/11/2020 H-3 155 78 +/- 79 200 SPW-4356 Water 11/20/2020 H-3 157 52 +/- 76 200 SPW-4633 Water 11/23/2020 Ra-226 0.05 0.04 +/- 0.11 2

SPW-4508 Water 12/4/2020 H-3 159

-68 +/- 69 200 SPW-4624 Water 12/18/2020 H-3 160 8 +/-77 200 SPW-4740 Water 12/18/2020 Ra-226 0.04 0.02 +/- 0.03 2

a Liquid sample results are reported in pCi/Liter, air filters ( pCitm3>, charcoal (pCi/charcoal canister), and solid samples (pCi/g).

b Laboratory codes : W & SPW (Water), Ml (milk), AP (air filter), SO (soil), VE (vegetation), CH (charcoal canister), F (fish), U (urine).

c l-131(G); iodine-131 as analyzed by gamma spectroscopy.

d Activity reported is a net activity result.

A-11

TABLE A-6. lntralaboratory "Duplicate" Samples Concentration*

Averaged Lab Codeb Date Analysis First Result Second Result Result Acceptance SG-20,21 1/2/2020 Pb-214 2.23 +/- 0.12 1.61 +/- 0.09 1.92 +/- 0.08 Pass SG-20,21 1/2/2020 Ac-228 1.49 +/- 0.20 1.42 +/-0.18 1.46+/-0.13 Pass AP-5060,5061 1/3/2020 Be-7 0.052 +/- 0.014 0.063 +/- 0.012 0.057 +/- 0.009 Pass AP-010720A,B 1/7/2020 Gr. Beta 0.023 +/- 0.004 0.022 +/- 0.004 0.022 +/- 0.003 Pass WW-72,73 1/7/2020 H-3 547 +/- 101 478 +/- 98 513 +/- 70 Pass WW-184,185 1/21/2020 H-3 265 +/- 88 311 +/- 90 288 +/- 63 Pass SWU-253,254 1/28/2020 Gr. Beta 1.73 +/- 0.58 2.10 +/- 0.62 1.92 +/- 0.42 Pass DW-20014,20015 1/29/2020 Ra-228 3.34 +/- 0.74 2.25 +/- 0.70 2.80 +/- 0.51 Pass DW-20014,20015 1/29/2020 Ra-226 1.05 +/- 0.15 0.64 +/- 0.24 0.85 +/- 0.14 Pass S-209,210 1/31/2020 K-40 8.28 +/- 0.20 7.95 +/- 0.42 8.12 +/- 0.23 Pass LW-383,384 1/31/2020 Gr. Beta 1.67 +/- 0.58 0.77 +/- 0.52 1.22 +/- 0.39 Pass AP-020320A,B 2/3/2020 Gr. Beta 0.021 +/- 0.004 0.024 +/- 0.004 0.023 +/- 0.003 Pass S-362,363 2/7/2020 Pb-214 2.39 +/- 0.11 2.25 +/- 0.10 2.32 +/- 0.07 Pass S-362,363 2/7/2020 Ac-228 1.84+/-0.18 1.95+/-0.17 1.90+/-0.12 Pass DW-20018,20019 2/7/2020 Gr. Alpha 0.23 +/- 0.86 0.37 +/- 0.88 0.30 +/- 0.62 Pass DW-20018,20019 2/7/2020 Gr. Beta 0.50 +/- 0.56 1.19 +/- 0.63 0.85 +/- 0.42 Pass DW-20026,20027 2/7/2020 Ra-226 2.40 +/- 0.21 2.11 +/- 0.15 2.26 +/- 0.13 Pass DW-20026,20027 2/7/2020 Ra-228 2.60 +/- 0.68 1.81 +/- 0.57 2.21 +/- 0.44 Pass WW-452,453 2/17/2020 H-3 583 +/- 102 678 +/- 106 630 +/- 74 Pass DW-20031,20032 2/25/2020 Gr. Alpha 1.02 +/- 0.77 0.80 +/- 0.81 0.91 +/- 0.56 Pass DW-20031,20032 2/25/2020 Gr. Beta 1.11 +/- 0.59 1.19 +/- 0.58 1.15 +/- 0.41 Pass DW-20038,20039 3/3/2020 Ra-226 8.39 +/- 0.43 8.78 +/- 0.49 8.59 +/- 0.33 Pass DW-20038,20039 3/3/2020 Ra-228 2.81 +/- 1.00 2.31 +/- 0.86 2.56 +/- 0.66 Pass WW-752,753 3/13/2020 H-3 435 +/- 94 393 +/- 92 414 +/- 66 Pass S-868,8_69 3/13/2020 Pb-214 0.97 +/- 0.10 0.99 +/- 0.09 0.98 +/- 0.07 Pass S-868,869 3/13/2020 Ac-228 0.93 +/- 0.18 1.01 +/- 0.23 0.97 +/- 0.15 Pass LW-977,978 3/25/2020 Gr. Beta 0.98 +/- 0.53 0.92 +/- 0.51 0.95 +/- 0.37 Pass AP-1220,1221 3/31/2020 Be-7 0.063 +/- 0.011 0.062 +/- 0.013 0.063 +/- 0.009 Pass SWT-912,913 3/31/2020 Gr. Beta 0.79 +/- 0.53 0.49 +/- 0.50 0.64 +/- 0.37 Pass AP-956,957 4/2/2020 Be-7 0.189 +/- 0.097 0.256 +/- 0.130 0.222 +/- 0.081 Pass AP-1110, 1111 4/3/2020 Be-7 0.069 +/- 0.012 0.072 +/- 0.013 0.071 +/- 0.009 Pass WW-1047,1048 4/7/2020 H-3 438 +/- 96 478 +/- 98 458 +/- 69 Pass VE-1022,1023 4/8/2020 Be-7 9.28 +/- 0.57 8.00 +/- 0.62 8.64 +/- 0.42 Pass VE-1022, 1023 4/8/2020 K-40 3.89 +/- 0.67 3.94 +/- 0.73 3.92 +/- 0.49 Pass S-1199, 1200 4/12/2020 Pb-214 0.77 +/- 0.07 0.98 +/- 0.08 0.88 +/- 0.05 Pass S-1199,1200 4/12/2020 Ac-228 1.09+/-0.15 1.18 +/- 0.17 1.14 +/- 0.11 Pass SS-1419,1420 4/14/2020 K-40 10.8 +/- 0.6 9.4 +/- 0.4 10.1 +/- 0.4 Pass AP-1241,1242 4/16/2020 Be-7 0.203 +/- 0.113 0.245 +/- 0.145 0.224 +/- 0.092 Pass DW-20051,20052 4/23/2020 Ra-228 3.50 +/- 0.85 4.60 +/- 0.89 4.05 +/- 0.62 Pass DW-20051,20052 4/23/2020 Ra-226 0.80 +/- 0.10 0.60 +/- 0.10 0.70 +/- 0.07 Pass SS-1310,1311 4/23/2020 K-40 7,827 +/- 492 8,157 +/- 505 7,992 +/- 352 Pass LW-1375,1376 4/29/2020 Gr. Beta 1.62 +/- 0.59 1.61 +/- 0.58 1.62 +/- 0.41 Pass A-12

TABLE A-6. lntralaboratory "Duplicate" Samples Concentration" Averaged Lab Codeb Date Analysis First Result Second Result Result Acceptance F-1828,1829 4/29/2020 K-40 1.35 +/- 0.41 0.98 +/- 0.33 1.16 +/- 0.27 Pass SG-1398, 1399 5/5/2020 Pb-214 7.51 +/- 0.19 8.62 +/- 0.17 8.07 +/- 0.13 Pass SG-1398,1399 5/5/2020 Ac-228 6.80 +/- 0.31 6.77 +/- 0.27 6.79 +/- 0.21 Pass SW-1461, 1462 5/7/2020 H-3 315 +/- 88 320 +/- 89 317 +/- 63 Pass AP-1610,1611 5/14/2020 Be-7 0.179 +/- 0.101 0.172 +/- 0.086 0.176 +/- 0.066 Pass DW-20062,20063 5/19/2020 Gr. Alpha 6.20 +/- 1.30 5.00 +/- 1.30 5.60 +/- 0.92 Pass DW-20062,20063 5/19/2020 Gr. Beta 6.09 +/- 0.77 5.51 +/- 0.72 5.80 +/- 0.53 Pass W-1805,1806 5/25/2020 Ra-226 0.42 +/- 0.16 0.24 +/- 0.17 0.33 +/- 0.12 Pass F-1763,1764 5/26/2020 K-40 2.82 +/- 0.47 3.01 +/- 0.45 2.92 +/- 0.33 Pass AP-052620A,B 5/26/2020 Gr. Beta 0.014 +/- 0.003 0.016 +/- 0.003 0.015 +/- 0.002 Pass DW-20066,20067 6/1/2020 Ra-226 0.21 +/- 0.09 0.33 +/- 0.12 0.27 +/- 0.08 Pass DW-20066,20067 6/1/2020 Ra-228 0.05 +/- 0.43 0.03 +/- 0.39 0.04 +/- 0.29 Pass P-1849, 1850 6/1/2020 H-3 547 +/- 102 700 +/- 108 624 +/- 74 Pass AP-1893,1894 6/4/2020 Be-7 0.164 +/- 0.080 0.251 +/- 0.140 0.208 +/- 0.081 Pass SW-1872,1873 6/4/2020 H-3 385 +/- 94 400 +/- 95 393 +/- 67 Pass AP-052620A,B 6/8/2020 Gr. Beta 0.024 +/- 0.004 0.025 +/- 0.005 0.024 +/- 0.003 Pass WW-2025,2026 6/16/2020 H-3 318 +/- 92 320 +/- 92 319 +/- 65 Pass AP-061620A,B 6/16/2020 Gr. Beta 0.017 +/- 0.003 0.019 +/- 0.003 0.018 +/- 0.002 Pass DW-20078,20079 6/17/2020 Ra-226 0.53 +/- 0.11 0.50 +/- 0.10 0.52 +/- 0.07 Pass DW-20078,20079 6/17/2020 Ra-228 1.10 +/- 0.50 1.11 +/- 0.50 1.11 +/- 0.35 Pass AP-2048,2049 6/18/2020 Be-7 0.222 +/- 0.087 0.221 +/- 0.092 0.221 +/- 0.063 Pass SW-2157,2158 6/23/2020 H-3 175 +/- 86 235 +/- 89 205 +/- 62 Pass AP-062320A,B 6/23/2020 Gr. Beta 0.021 +/- 0.003 0.023 +/- 0.004 0.022 +/- 0.003 Pass AP-2136,2137 6/25/2020 Be-7 0.242 +/- 0.099 0.343 +/- 0.115 0.292 +/- 0.076 Pass AP-2366,2367 6/30/2020 Be-7 0.144 +/- 0.018 0.177 +/- 0.019 0.161 +/- 0.013 Pass SWU-2180,2181 6/30/2020 H-3 105 +/- 82 199 +/- 87 152 +/- 60 Pass AP-2473,2474 7/1/2020 Be-7 0.079 +/- 0.011 0.089 +/- 0.012 0.084 +/- 0.008 Pass AP-2473,2474 7/1/2020 K-40 0.010 +/- 0.006 0.015 +/- 0.009 0.013 +/- 0.005 Pass AP-2408,2409 7/2/2020 Be-7 0.084 +/- 0.016 0.085 +/- 0.014 0.085 +/- 0.011 Pass P-2264,2265 7/6/2020 H-3 149 +/- 83 144 +/- 83 147 +/- 59 Pass DW-20091,20092 7/10/2020 Ra-226 0.77 +/- 0.17 0.69 +/- 0.24 0.73 +/- 0.15 Pass DW-20091,20092 7/10/2020 Ra-228 0.61 +/- 0.56 0.59 +/- 0.55 0.60 +/- 0.39 Pass SW-2450,2451 7/14/2020 H-3 410 +/- 96 487 +/- 99 448 +/-69 Pass VE-2494,2495 7/16/2020 K-40 1.68 +/- 0.25 2.08 +/- 0.26 1.88+/-0.18 Pass DW-20102,20103 7/17/2020 Gr. Alpha 1.98 +/- 0.82 2.65 +/- 0.82 2.32 +/- 0.58 Pass DW-20102,20103 7/17/2020 Ra-226 0.84 +/- 0.20 0.89 +/- 0.20 0.87 +/- 0.14 Pass DW-20102,20103 7/17/2020 Ra-228 1.24 +/- 0.67 1.57 +/- 0.70 1.41 +/-0.48 Pass WW-2604,2605 7/20/2020 H-3 35,989 +/- 576 36,039 +/- 577 36,014 +/-408 Pass SWU-2669,2670 7/28/2020 H-3 103 +/- 80 101 +/- 80 102 +/- 57 Pass SWU-2669,2670 7/28/2020 Gr. Beta 1.49 +/- 0.56 1.05 +/- 0.51 1.27 +/- 0.38 Pass S-2711,2712 7/29/2020 K-40 17.4 +/- 0.9 19.6 +/- 1.0 18.5 +/- 0.7 Pass A-13

TABLE A-6. lntralaboratory "Duplicate" Samples Concentration" Averaged Lab Codeb Date Analysis First Result Second Result Result Acceptance WW-2799,2800 8/4/2020 H-3 471 +/- 100 437 +/- 99 454 +/- 70 Pass WW-2933,2934 8/4/2020 H-3 316 +/- 91 300 +/- 90 308 +/- 64 Pass S-2774,2775 8/4/2020 K-40 5.9 +/- 0.9 6.1 +/- 0.8 6.0 +/- 0.6 Pass WW-2912,2913 8/5/2020 H-3 176 +/- 84 226 +/- 87 201 +/- 60 Pass F-3040,3041 8/7/2020 Gr. Beta 4.55 +/- 0.12 4.63 +/- 0.12 4.59 +/- 0.09 Pass F-3040,3041 8/7/2020 K-40 3.58 +/- 0.42 3.32 +/- 0.41 3.45 +/- 0.29 Pass WW-2867,2868 8/12/2020 H-3 169 +/- 85 219 +/- 86 194 +/- 61 Pass VE-2842,2843 8/12/2020 K-40 3.18 +/- 0.30 3.14 +/- 0.37 3.16 +/- 0.24 Pass F-2891,2892 8/14/2020 K-40 2.98 +/- 0.39

• 2.82 +/- 0.35 2.90 +/- 0.26 Pass VE-2954,2955 8/20/2020 Be-7 0.222 +/- 0.106 0.283 +/- 0.166 0.252 +/- 0.099 Pass VE-2954,2955 8/20/2020 K-40 4.09 +/- 0.37 3.75 +/- 0.38 3.92 +/- 0.27 Pass DW-20126,20127 8/25/2020 Ra-226 0.90 +/- 0.14 0.73 +/- 0.12 0.82 +/- 0.09 Pass DW-20126,20127 8/25/2020 Ra-228 1.55 +/- 0.52 2.30 +/- 0.58 1.93 +/- 0.39 Pass LW-3154,3155 8/26/2020 Gr. Beta 1.43 +/- 0.60 1.33 +/- 0.55 1.38 +/- 0.41 Pass VE-3084,3085 8/28/2020 Be-7 0.52 +/- 0.12 0.48 +/- 0.07 0.50 +/- 0.07 Pass VE-3084,3085 8/28/2020 K-40 3.87 +/- 0.16 3.36 +/- 0.31 3.62 +/- 0.17 Pass SWU-3133,3134 9/1/2020 H-3 107 +/- 84 116 +/- 84 111 +/- 59 Pass VE-3208,3209 9/8/2020 K-40 5.99 +/- 0.43 5.85 +/- 0.35 5.92 +/- 0.28 Pass VE-3187,3188 9/8/2020 Be-7 0.50 +/- 0.17 0.61 +/- 0.23 0.55 +/- 0.14 Pass VE-3187,3188 9/8/2020 K-40 4.64 +/- 0.54 4.97 +/- 0.45 4.81 +/- 0.35 Pass WW-3427,3428 9/10/2020 H-3 2,321 +/- 163 2,323 +/- 164 2,322 +/- 116 Pass DW-21033,21034 9/14/2020 Gr. Alpha 1.27 +/- 0.79 0.94 +/- 0.75 1.11 +/- 0.54 Pass DW-21033,21034 9/14/2020 Gr. Beta 1.02 +/- 0.60 1.01 +/- 0.59 1.02 +/- 0.42 Pass SG-3265,3266 9/14/2020 Pb-214 11.8 +/- 0.49 10.4 +/- 0.57 11.1 +/-0.38 Pass SG-3265,3266 9/14/2020 Ac-228 18.8 +/- 1.27 17.3 +/- 1.36 18.0 +/- 0.93 Pass SG-3265,3266 9/14/2020 Gr. Alpha 28.0 +/- 4.6 33,5 +/- 4.9 30.8 +/- 3.4 Pass SG-3265,3266 9/14/2020 Gr. Beta 42.1 +/- 2.8 44.5 +/- 3.0 43.3 +/- 2.1 Pass VE-3315,3316 9/15/2020 Be-7 0.25 +/- 0.10 0.28 +/- 0.16 0.27 +/- 0.09 Pass VE-3315,3316 9/15/2020 K-40 5.48 +/- 0.34 5.16 +/- 0.36 5.32 +/- 0.25 Pass WW-3339,3340 9/16/2020 H-3 196 +/- 85 199 +/- 85 198 +/- 60 Pass CF-3381,3382 9/21/2020 Be-7 0.20 +/- 0.10 0.19 +/- 0.11 0.20 +/- 0.07 Pass CF-3381,3382 9/21/2020 K-40 5.94 +/- 0.30 5.72 +/- 0.29 5.83 +/- 0.21 Pass AP-092120A,B 9/21/2020 Gr. Beta 0.043 +/- 0.005 0.041 +/- 0.005 0.042 +/- 0.004 Pass F-3706,3707 9/26/2020 K-40 1.86 +/- 0.35 1.83 +/- 0.39 1.84 +/- 0.26 Pass AP-092820A,B 9/28/2020 Gr. Beta 0.021 +/- 0.004 0.023 +/- 0.004 0.022 +/- 0.003 Pass XW-3620,3621 9/30/2020 Sr-89 11,760 +/- 140 12,487 +/- 133 12,124 +/- 97 Pass XW-3620,3621 9/30/2020 Sr-90 2,287 +/- 45 2,831 +/- 50 2,559 +/- 34 Pass XW-3620,3621 9/30/2020 Fe-55 1,623 +/- 462 1,833+/-474 1,728+/-331 Pass A-14

TABLE A-6. lntralaboratory "Duplicate" Samples Concentration" Averaged Lab Codeb Date Analysis First Result Second Result Result SW-3515,3516 10/1/2020 H-3 154 +/- 86 111 +/- 84 133 +/- 60 DW-20141,20142 10/1/2020 Ra-226 1.34+/-0.16 1.39+/-0.16 1.37 +/- 0.11 DW-20141,20142 10/1/2020 Ra-228 1.74 +/- 0.62 2.09 +/- 0.64 1.92 +/- 0.45 SW-3536,3537 10/5/2020 H-3 376 +/- 97 378 +/- 97 377 +/- 68 WW-3727,3728 10/8/2020 H-3 152 +/- 82 190 +/- 84 171 +/- 59 VE-3748,3749 10/12/2020 K-40 3.07 +/- 0.25 2.88 +/- 0.26 2.98 +/- 0.18 VE-3769,3770 10/12/2020 Be-7 0.80 +/- 0.31 0.51 +/- 0.15 0.66 +/- 0.17 VE-3769,3770 10/12/2020 K-40 5.69 +/- 0.61 5.79 +/- 0.39 5.74 +/- 0.36 WW-4092,4093 10/13/2020 H-3 6,484 +/- 252 6,275 +/- 248 6,380 +/- 177 WW-3838,3839 10/14/2020 H-3 313 +/- 90 263 +/- 88 288 +/- 63 WW-4394,4395 11/3/2020 H-3 161 +/- 83 199 +/- 85 180 +/- 60 WW-4587,4588 11/4/2020 H-3 6,468 +/- 252 6,638 +/- 255 6,553 +/- 179 WW-4524,4525 11/5/2020 H-3 160 +/- 86 131 +/- 84 145 +/- 60 VE-4415,4416 11/24/2020 Be-7 0.28 +/- 0.08 0.22 +/- 0.07 0.25 +/- 0.05 VE-4415,4416 11/24/2020 K-40 2.25 +/- 0.21 2.20 +/- 0.19 2.23 +/- 0.14 AP-4845,4846 12/31/2020 Be-7 0.07 +/- 0.01 0.06 +/- 0.02 0.06 +/- 0.01 Note: Duplicate analyses are performed on every twentieth sample received. Results are not listed for those analyses with activities that measure below the LLD.

• Results are reported in units of pCi/L, except for air filters (pCi/Filter or pCi/m3), food products, vegetation, soil and sediment (pCi/g).

Acceptance Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass b AP (Air Particulate), AV (Aquatic Vegetation), BS (Bottom Sediment), CF (Cattle Feed), CH (Charcoal Canister),

OW (Drinking Water), E (Egg), F (Fish); G (Grass), LW (Lake Water), Ml (Milk), P (Precipitation), PM (Powdered Milk),

S (Solid), SG (Sludge), SO (Soil), SS (Shoreline Sediment), SW (Surface Water), SWT (Surface Water Treated),

SWU (Surface Water Untreated), VE (Vegetation), W (Water), WW (Well Water).

A-15

TABLEA-7. Department of Energy's Mixed Analyte Performance Evaluation Program (MAPEP).

Concentrationa Reference Known Control Lab Code b Date Analysis Laboratory result Activity Limits c Acceptance MAAP-664 2/1/2020 Gross Alpha 2.26 +/-0.14 1.24 0.37 - 2.11 Fail d MAAP-664 2/1/2020 Gross Beta 2.40 +/- 0.07 2.00 1.00 - 3.00 Pass MAW-536 2/1/2020 Gross Alpha 0.86 +/- 0.06 1.03 0.31-1.75 Pass MAW-536 2/1/2020 Gross Beta 3.79 +/- 0.07 4.24 2.12 - 6.36 Pass MASO-662 2/1/2020 Cs-134 955 +/-9 1114 780 -1448 Pass MASO-662 2/1/2020 Cs-137 1089 +/- 12 1020 714 - 1326 Pass MASO-662 2/1/2020 Co-57 1106 +/- 8 1071 750 - 1392 Pass MASO-662 2/1/2020 Co-60 0.33 +/- 1.26 0

NA C Pass MASO-662 2/1/2020 Mn-54 1022 +/- 27 945 662 - 1229 Pass MASO-662 2/1/2020 Zn-65 842 +/- 17 751 526 - 976 Pass

\\

MASO-662 2/1/2020 K-40 710 +/- 42 625 438 -813 Pass MAW-534 2/1/2020 1-129 0.81 +/- 0.09 1.001

0. 701 - 1.301 Pass MAW-599 2/1/2020 H-3 202 +/- 9 196 137 - 255 Pass MAW-599 2/1/2020 Am-241 0.41 +/- 0.09 0.547 0.383 - 0.711 Pass MAW-599 2/1/2020 Cs-134 16.1 +/- 0.3 18.5 13.0 -24.1 Pass MAW-599 2/1/2020 Cs-137 11.5 +/- 0.4 11.3 7.9 - 14.7 Pass MAW-599 2/1/2020 Co-57 20.0 +/- 0.30 19.7 13.8 - 25.6 Pass MAW-599 2/1/2020 Co-60 10.6 +/- 0.2 10.6 7.4 - 13.8 Pass MAW-599 2/1/2020 Mn-54 20.5 +/- 0.4 19.6 13.7 - 25.5 Pass MAW-599 2/1/2020 Zn-65 24.1 +/- 0.70 22.2 15.5 - 28.9 Pass MAW-599 2/1/2020 K-40 0.57 +/- 1.54 0

NA C Pass MAW-599 2/1/2020 Fe-55 13.3 +/- 12.2 17.8 12.5 -23.1 Pass MAW-599 2/1/2020 Ni-63 9.72 +/- 0.43 11.1 7.8 - 14.4 Pass MAW-599 2/1/2020 Sr-90 0.07 +/- 0.18 0

NA C Pass MAW-599 2/1/2020 Tc-99 3.41 +/- 0.31 3.63

• 2.54 -4.72 Pass MAW-599 2/1/2020 Ra-226 0.56 +/- 0.06 0.365 0.256 - 0.475 Fail e MAW-599 2/1/2020 Pu-238 0.69 +/- 0.08 0.94 0.66 -1.22 Pass MAW-599 2/1/2020 Pu-239/240 0.48 +/- 0.07 0.737 0.516 - 0.958 Fail 1 MAW-599 2/1/2020 U-234 1.04 +/- 0.08 0.97 0.68 -1.26 Pass MAW-599 2/1/2020 U-238 1.02 +/- 0.08 0.95 0.67 -1.24 Pass A-16

TABLEA-7. Department of Energy's Mixed Analyte Performance Evaluation Program (MAPEP).

Concentration° Reference Known Control Lab Code b Date Analysis Laboratory result Activity Limits c Acceptance MAVE-668 2/1/2020 Cs-134 3.51 +/- 0.22 3.82 2.67 -4.97 Pass MAVE-668 2/1/2020 Cs-137 3.04+/-0.18 2.77 1.94 - 3.60 Pass MAVE-668 2/1/2020 Co-57 0.02 +/- 0.03 0

NA C Pass MAVE-668 2/1/2020 Co-60 2.92 +/- 0.08 2.79 1.95 - 3.63 Pass MAVE-668 2/1/2020 Mn-54 5.16 +/- 0.14 4.58 3.21 - 5.95 Pass MAVE-668 2/1/2020 Zn-65 4.36 +/- 0.16 3.79 2.65 -4.93 Pass MAW-689 2/1/2020 Ra-226 172 +/- 1 189 132 - 246 Pass MAW-689 2/1/2020 Ra-228 65 +/- 1 75 53 - 98 Pass MMP-3181 8/1/2020 Gross Alpha 0.45 +/- 0.06 0.528 0.158 - 0.898 Pass MAAP-3181 8/1/2020 Gross Beta 0.97 +/- 0.04 0.915 0.458 - 1.373 Pass MADW-3101 8/1/2020 Gross Alpha 0.57 +/- 0.04 0.62 0.19 -1.05 Pass MADW-3101 8/1/2020 Gross Beta 0.75 +/- 0.04 0.83 0.42 -1.25 Pass MASO-3179 8/1/2020 Cs-134 599 +/- 7 710 497 -923 Pass MASO-3179 8/1/2020 Cs-137 3.33 +/- 4.81 0

NA C Pass MASO-3179 8/1/2020 Co-57 1145 +/- 8 1100 770 -1430 Pass MASO-3179 8/1/2020 Co-60 965 +/- 9 1000 700 - 1300 Pass MASO-3179 8/1/2020 Mn-54 651 +/- 11 610 427 - 793 Pass MASO-3179 8/1/2020 Zn-65 524 +/- 14 470 329 -611 Pass MASO-3179 8/1/2020 K-40 684 +/- 58 622 435 - 809 Pass MAW-3175 8/1/2020 Cs-134 13.9 +/- 0.3 15.2 10.6 - 19.8 Pass MAW-3175 8/1/2020 Cs-137 15.4 +/- 0.4 14.3 10.0-18.6 Pass MAW-3175 8/1/2020 Co-57 0.10 +/- 0.16 0

NA C Pass MAW-3175 8/1/2020 Co-60 12.5 +/- 0.3 12.2 8.5 -15.9 Pass MAW-3175 8/1/2020 Mn-54 0.07 +/- 0.17 0

NA C Pass MAW-3175 8/1/2020 Zn-65 18.3 +/- 0.6 16.9 11.8 - 22.0 Pass MAW-3175 8/1/2020 K-40 1.06 +/- 1.65 0

NAC Pass A-17

TABLEA-7. Department of Energy's Mixed Analyte Performance Evaluation Program (MAPEP).

Concentration 8

Reference Known Control Lab Code b Date Analysis Laboratory result Activity Limits 0

Acceptance MAAP-3177 8/1/2020 Cs-134 1.28 +/- 0.05 1.83 1.28 - 2.38 MAAP-3177 8/1/2020 Cs-137 0.981 +/- 0.068 0.996 0.697 - 1.295 MAAP-3177 8/1/2020 Co-57 0.020 +/- 0.027 0

NA C MAAP-3177 8/1/2020 Co-60 1.57 +/- 0.06 1.73 1.21 -2.25 MAAP-3177 8/1/2020 Mn-54 0.751 +/- 0.077 1.400 0.98 -1.82 MAAP-3177 8/1/2020 Zn-65 2.07 +/- 0.15 2.00 1.40 - 2.60 MAVE-3185 8/1/2020 Cs-134 4.73 +/- 0.10 4.94 3.46 - 6.42 MAVE-3185 8/1/2020 Cs-137 0.03 +/- 0.06 0

NA C MAVE-3185 8/1/2020 Co-57 7.83 +/- 0.12 6.67 4.67 - 8.67 MAVE-3185 8/1/2020 Co-60 4.41 +/- 0.10 4.13 2.89 - 5.37 MAVE-3185 8/1/2020 Mn-54 6.52 +/- 0.18 5.84 4.09 - 7.59 MAVE-3185 8/1/2020 Zn-65 7.26 +/- 0.19 6.38 4.47 - 8.29 a Results are reported in units of Bq/kg (soil), Bq/L (water) or Bq/total sample (filters, vegetation).

b Laboratory codes as follows: MAW (water), MADW (water), MAAP (air filter), MASO (soil) and MAVE (vegetation).

0 MAPEP results are presented as the known values and expected laboratory precision (1 sigma, 1 determination) and control limits as defined by the MAPEP. A known value of "zero" indicates an analysis was included in the testing series as a "false positive". MAPEP does not provide control limits.

Fai19 Pass Pass Pass Failh Pass Pass Pass Pass Pass Pass Pass d The lab utilized a MAPEP specific gross alpha/beta filter calibration as discussed in the MAPEP test instructions for MAAP-664.

Using the MAPEP specific calibration for MAAP-664 caused the bias to shift from low to high.

The subsequent MAPEP study result was acceptable. See Lab code MAAP-3101 (reference date 8/1/2020).

e An investigation of the Radium-226 failure was inconclusive. Subsequent Ra-226 PT analyses were satisfactory.

See ERA RAD-121 and RAD-122 studies Table A-1 and NY ELAP shipment 437R Table A-2.

1 Analysis was repeated in duplicate with acceptable results: Pu-238 (0.97 & 1.10 Bq/Kg);

Pu-239 (0.83 & 0.83 Bq/Kg). The cause of the failure could not be determined.

9 Analysis was run in duplicate. Results were (1.18 Bq/sample and 1.37 Bq/sample). The submitted result was the mean of the two results (1.28 +/- 0.05 Bq/sample).

h A data transcription error resulted in an erroneous reported value. The actual result (1.36 +/- 0.08 Bq/L) passes.

A-18

TABLEA-8. lnterlaboratory Comparison Crosscheck Program, Environmental Resource Associates (ERA)".

MRAD-30 Study Concentration a Lab Code b Date Analysis Laboratory ERA Control Result Value c Limits d Acceptance ERAP-769 3/16/2020 Am-241 71.0 74.7 53.3 - 99.6 Pass ERAP-769 3/16/2020 Cs-134 1210 1390 902 - 1700 Pass ERAP-769 3/16/2020

. Cs-137 393 351 288 -460 Pass ERAP-769 3/16/2020 Co-60 450.0 422.0 359.0 - 536 Pass ERAP-769 3/16/2020 Fe-55 1200 1260 460 - 2010 Pass ERAP-769 3/16/2020 Mn-54

< 2.4

< 50.0 0.00 - 50.0 Pass ERAP-769 3/16/2020 Zn-65 856 694 569 -1060 Pass ERAP-769 3/16/2020 Pu-238 31.4 28.0 21.1 -34.4 Pass ERAP-769 3/16/2020 Pu-239 43.9 40.1 30.0 -48.4 Pass ERAP-769 3/16/2020 Sr-90 190 175 111 - 238 Pass ERAP-769 3/16/2020 U-234 56.7 56.2 41.7 -65.9 Pass ERAP-769 3/16/2020 U-238 57.0 55.7 42.1 - 66.5 Pass ERAP-771 3/16/2020 Gross Alpha 33.4 29.3 15.3 -48.3 Pass ERAP-771 3/16/2020 Gross Beta 68.3 66.4 40.3 -100 Pass

• Results obtained by Environmental, Inc., Midwest Laboratory (EIML) as a participant in the crosscheck program for proficiency testing administered by Environmental Resource Associates, serving as a replacement for studies conducted previously by the Environmental Measurements Laboratory Quality Assessment Program (EML).

b Laboratory code ERAP (air filter). Results are reported in units of (pCi/Filter).

c The ERA_ Assigned values for the air filter standards are equal to 100% of the parameter present in the standard as determined by the gravimetric and/or volumetric measurements made during standard preparation as applicable.

d The acceptance limits are established per the guidelines contained in the Department of Energy (DOE) report EML-564, Analysis of Environmental Measurements Laboratory (EML) Quality Assessment Program (QAP)

Data Determination of Operational Criteria and Control Limits for Performance Evaluation Purposes or ERA's SOP for the generation of Performance Acceptance Limits.

A-19

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Appendix B Data Reporting Conventions

APPENDIX 8.

DATA REPORTING CONVENTIONS Data Reporting Conventions 1.0. All activities, except gross alpha and gross beta, are decay corrected to collection time or the end of the collection period.

2.0. Single Measurements Each single measurement is reported as follows:

x +/- s where:

x = value of the measurement; s = 2cr counting uncertainty (corresponding to the 95% confidence level).

In cases where the activity is less than the lower limit of detection L, it is reported as: < L, where L = the lower limit of detection based on 4.66cr uncertainty for a background sample.

3.0. Duplicate analyses If duplicate analyses are reported, the convention is as follows. :

3.1 Individual results: For two analysis results; x1 +/- s1 and x2 +/- s2 Reported result:

x +/- s; where x = (1/2) (x1 + x2) ands= (1/2),J s~ + s; 3.2.

3.3.

Individual results:

< L1 *, < L2 Individual results:

x +/- s, < L 4.0. Computation of Averages and Standard Deviations Reported result: < L, where L = lower of L1 and L2 Reported result:

x +/- s if x <'= L; < L otherwise.

4.1 Averages and standard deviations listed in the tables are computed from all of the individual measurements over the period averaged; for examp~e, an annual standard deviation wouid not be the average of quarterly

~tandard deviations. The average x and standard deviation "s" of a set of n numbers x1, x2... xn are defined as follows:

4.2 Values below the highest lower limit of detection are not included in the average.

4.3 If all values in the averaging group are less than the highest LLD, the highest LLD is reported.

4.4 If all but one of the values are less than the highest LLD, the single value x and associated two sigma error is reported.

4.5 In rounding off, the following rules are followed:

4.5.1. If the number following those to be retained is less than 5, the number is dropped, and the retained numbers are kept unchanged. As an example, 11.443 is rounded off to 11.44.

4.5.2.

If the number following those to be retained is equal to or greater than 5, the number is dropped and the last retained number is raised by 1. As an example, 11.445 is rounded off to 11.45.

8-1

I,.

1 Appendix C Maximum permissible concentrations of radioactivity in air and water above natural background in unrestricted areas

APPENDIX C Table C-1.

Maximum permissible concentrations of radioactivity in air and water above natural background in unrestricted areas 8

Air (pCi/m 3

)

Water (pCi/L)

Gross alpha 1 X 10" 3

Strontium-89 8,000 Gross beta 1

Strontium-90 500 lodine-131 b 2.8 X 10-1 Cesium-137 1,000 Barium-140 8,000 lodine-131 1,000 Potassium-40 c 4,000 Gross alpha 2

Gross beta 10 Tritium 1 X 10 6

a Taken from Table 2 of Appendix J;3 to Code of Federal Regulations Title 10, Part 20, and appropriate footnotes.

Concentrations may be averaged over a period not greater than one year.

b Value adjusted by a factor of 700 to reduce the dose resulting from the air-grass-cow-milk-child pathway.

c A natural radionuclide.

C-1

• **