ML21118A820

2020 Annual Radiological Environmental Operating Report

ML21118A820
Person / Time
Site:	Wolf Creek
Issue date:	04/28/2021
From:	Benham R Wolf Creek
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RA 21-0041
Download: ML21118A820 (178)

Text

Ron Benham Director Nuclear and Regulatory Affairs April 28, 2021 RA 21-0041 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

Subject:

Docket No. 50-482: 2020 Annual Radiological Environmental Operating Report Commissioners and Staff:

The purpose of this letter is to submit the enclosed Annual Radiological Environmental Operating Report, which is being submitted pursuant to Wolf Creek Generating Station (WCGS) Technical Specification 5.6.2. This report covers radiological environmental monitoring for WCGS for the period of January 1, 2020, through December 31, 2020.

This letter contains no commitments. If you have any questions concerning this matter, please contact me at (620) 364-4204.

Sincerely, Ron Benham RDB/rlt Enclosure cc: S. S. Lee (NRC), w/e S. A. Morris (NRC), w/e N. OKeefe (NRC), w/e Senior Resident Inspector (NRC), w/e P.O. Box 411 l Burlington, KS 66839 l 620-364-8831

Enclosure to RA 21-0041 Wolf Creek Generating Station 2020 Annual Radiological Environmental Operating Report (177 pages including this page)

WOLF CREEK NUCLEAR OPERATING CORPORATION WOLF CREEK GENERATING STATION 2020 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT March 30, 2021

TABLE OF CONTENTS List of Tables iii List of Figures iii List of Charts iii Executive Summary 1 Introduction 1 I. Program Description 1 II. Discussion of Results 4 III. Program Revisions/Changes 9 IV. Program Deviations 10 V. Interlaboratory Comparison Program 10 VI. Comparison to the Radioactive Effluent Release Program 10 VII. Condition Reports 11 Tables 12 Figures 21 Charts 26 Appendix A - Interlaboratory Comparison Program Results Appendix B - Summary Tables Appendix C - Individual Sample Results Air Particulate Filters and Radioiodine Canisters C-1 Quarterly Air Particulate - Gamma C-13 Surface Water C-21 Ground Water C-29 Ground Water (Lake Perimeter) C-43 Drinking Water C-61 Quarterly Drinking Water - Tritium C-71 Shoreline Sediment C-72 Fish C-76 Food/Garden C-83 Food/Crops C-93 Bottom Sediment C-95 Aquatic Vegetation C-99 Terrestrial Vegetation C-102 Soil C-104 i

Meat C-105 Appendix D - Land Use Census Report ii

LIST OF TABLES 1 Radiological Environmental Monitoring Program Description 12 2 Sample Location Identifiers, Distances (Miles) and Directions (Sectors) 17 3 OSL Dosimeter Results 20 LIST OF FIGURES 1 Airborne Pathway Sampling Locations 21 2 Direct Radiation Pathway Sampling Locations 22 3 Waterborne Pathway Sampling Locations 23 4 Ingestion Pathway Sampling Locations 24 5 Distant Sampling Locations 25 LIST OF CHARTS 1 Airborne Gross Beta Weekly Results 26 2 Historical Airborne Smoothed Indicator and Control Gross Beta 27 3 OSL Dosimeters - Indicator and Control Locations 28 4 Historical TLD Nearsite Locations and Control Locations 29 5 Coffey County Lake Surface Water Tritium Data 30 6 Drinking Water Gross Beta (5 years) 31 7 Detected Cs-137 Activity in Bottom Sediment 32 iii

EXECUTIVE

SUMMARY

Plant-related activation, corrosion, or fission products were not detected during 2020 in air particulate filters, radioiodine canisters, ground water, drinking water, broadleaf vegetation, shoreline sediment, crops, bottom sediment, aquatic vegetation, terrestrial vegetation or soil samples. Activation, corrosion or fission products attributable to plant operation were detected during 2020 in surface water, fish, and deer samples.

Nuclides detected in Radiological Environmental Monitoring Program (REMP) samples were below applicable Nuclear Regulatory Commission (NRC) reporting levels.

Based upon the REMP results, it was concluded station operations had no significant radiological impact on the health and safety of the public or the environment.

INTRODUCTION The 2020 Annual Radiological Environmental Operating Report for Wolf Creek Generating Station (WCGS) covers the period from January 1 through December 31, 2020. WCGS is in Coffey County, Kansas, approximately five miles northeast of Burlington, Kansas.

Fuel loading commenced at WCGS on March 12, 1985. The operational phase of the REMP began with initial criticality on May 22, 1985, and the first detectable quantities of radioactivity were reported in plant effluents in June 1985.

This report contains a description of the REMP conducted by Wolf Creek Nuclear Operating Corporation (WCNOC), a discussion of monitoring program results, the revisions or changes to the program, program deviations, the Interlaboratory Comparison Program and a comparison to the Radioactive Effluent Release Program. The Interlaboratory Comparison Program results, a summary of results in the NRC Branch Technical Position specified format, the individual sample results, and the Land Use Census Report are included as appendices.

I. PROGRAM DESCRIPTION Radiological environmental monitoring samples were collected according to the schedule in WCGS procedure AP 07B-004, Offsite Dose Calculation Manual (Radiological Environmental Monitoring Program). Radiological environmental monitoring program samples were collected by the WCGS Environmental Management group and were analyzed by Environmental, Inc.

Landauer, Inc. processed the environmental optically stimulated luminescence (OSL) dosimeters. Table 1 identifies the exposure pathway/sample type, number of samples and sample locations, sample collection frequency, and the type and frequency of analysis. Table 2 lists the sample location identifiers, distances and directions from the plant. Samples in addition to those required by AP 07B-004 were also obtained and analyzed.

The following is a description of the sampling and analysis program by individual pathways.

A. Airborne Pathway Low volume air sampling pumps with digital flow meters continuously sampled air through 47 mm glass fiber particulate filters and radioiodine canisters, respectively. The air particulate filters and radioiodine canisters were collected weekly. Gross beta analysis was performed weekly on the air particulate filters. Gamma isotopic analysis was also performed quarterly on 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 1 of 32

the air particulate filters. Radioiodine canisters were analyzed weekly for I-131.

Air samples were collected from six locations. The indicator locations sampled included 2, 18, 32, 37 and 49. A control location near the intersection of 20th Road and Yearling Road (location

53) was also sampled. Indicator sample locations are shown in Figure 1 and the control sample location is shown in Figure 5.

B. Direct Radiation Pathway Optically stimulated luminescence (OSL) dosimeters were used continuously at 44 locations during the sample year to measure direct radiation. The OSLs were typically positioned roughly 3 to 4 feet above the ground in plastic thermostat boxes. Three OSLs were placed at each designated location. The OSLs were changed out quarterly and analyzed quarterly for gamma dose. Transit dose was measured and subtracted from the ambient dose. Indicator OSL sample locations are illustrated in Figure 2 and control sample locations are shown in Figure 5.

Control sample locations were 39 (Beto Junction) and 53 (near the intersection of 20th Road and Yearling Road).

C. Waterborne Pathway Gamma isotopic analysis was performed on the water samples. In addition to gamma isotopic analysis, analysis for I-131 was performed monthly on drinking water and quarterly on ground water samples. Gross beta analysis was performed monthly on drinking water samples. Tritium analysis was performed monthly for surface water and quarterly for drinking water. Tritium analysis was also performed quarterly on ground water samples. Four surface water samples from the Coffey County Lake Spillway (SP) location and four surface water samples from the John Redmond Reservoir (JRR) location were also analyzed for Fe-55. The waterborne pathway sample locations are shown in Figures 3 and 5.

Monthly grab samples of surface water were collected from the John Redmond Reservoir (JRR) control location and from the Coffey County Lake Spillway (SP) indicator location.

Quarterly grab samples of ground water were collected from seven wells. Six locations (C-10, C-49, F-1, G-2, J-1 and J-2) located hydrologically down gradient from the site were used as indicator sample locations. Location B-12 located hydrologically up gradient from the site was used as a control location.

Drinking water was sampled at the water treatment facilities in the towns of Iola (indicator sample location IO-DW) and Burlington (control sample location BW-15). The Iola facility is located downstream of the Neosho River-Wolf Creek confluence and the Burlington facility is located upstream of the Neosho River-Wolf Creek confluence. Composite samples were obtained monthly from automatic samplers at each location. The automatic drinking water samples collected approximately 27 milliliters of water every two hours.

Shoreline sediments were sampled semiannually. Gamma isotopic analyses were performed on the shoreline sediment samples. Shoreline sediment sample locations were the Coffey County Lake discharge cove (DC) indicator location and the John Redmond Reservoir (JRR) control location.

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D. Ingestion Pathway Milk was not collected during the sample year. The Land Use Census did not identify any locations producing milk for human consumption within five miles of the plant.

Fish were sampled semiannually from the indicator sample location Coffey County Lake (CCL) and from the tail waters of John Redmond Reservoir (JRR) control sample location. These sample locations are identified in Figure 4. Gamma isotopic analyses were performed on the boneless meat portions of the fish. Several species of game fish and rough fish were sampled.

Fish were also analyzed for tritium.

Broadleaf vegetation samples were collected monthly when available during the growing season. Indicator (A-3, B-1, H-2 and Q-6) location gardens (Figure 4) and a control (D-2) location garden (Figure 5) were sampled. Gamma isotopic analyses were performed on these samples.

Irrigated crop samples were obtained from indicator location (NR-D1) and non-irrigated samples from indicator location (NR-D2) downstream of the confluence of Wolf Creek and the Neosho River. Irrigated crops were also sampled from control location (NR-U1). Gamma isotopic analysis was performed on each sample. Crop sample locations are identified on Figure 5.

E. Additional Samples Collected (not required by AP 07B-004)

Bottom sediment samples were collected semiannually from indicator sample locations at the Discharge Cove (DC), and the control sample location at John Redmond Reservoir (JRR).

Gamma isotopic analyses were performed on the bottom sediment samples. Two samples collected from indicator location (DC) were also analyzed for Fe-55. No samples were analyzed for Ni-63, Sr-89 and Sr-90 activity (Hard to Detect Metals). One shoreline sediment sample was collected from indicator sample location at Stringtown Cemetery (SC) as part of a cooperative sampling effort with the Kansas Department of Health and Environment (KDHE). The sample locations are identified on Figure 3.

Aquatic vegetation was collected from indicator locations at the Makeup Discharge Structure (MUDS), Environmental Education Area (EEA) and Stringtown Cemetery (SC). Gamma isotopic analyses were performed on the aquatic vegetation samples. These samples were collected as part of a cooperative sampling effort with the KDHE. The sample locations are identified on Figure 3.

Terrestrial vegetation (grass) was sampled from the Environmental Education Area (EEA) and the Makeup Discharge Structure (MUDS) indicator sample locations. Gamma isotopic analysis was performed on the grass samples. These samples were collected as part of a cooperative sampling effort with the KDHE. The sample locations are identified on Figure 4.

Soil was sampled from the Environmental Education Area (EEA) and Makeup Discharge Structure (MUDS). Gamma isotopic analysis was performed on the soil samples. These samples were collected as part of a cooperative sampling effort with the KDHE. The sample locations are identified on Figure 4.

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Turkey was sampled from indicator sample location R 3.9. Gamma isotopic analysis and tritium analysis was performed on the turkey sample. This sample was collected as part of a cooperative sampling effort with the KDHE. The sample location is identified on Figure 4.

Deer was sampled from indicator sample location G 1.8. Gamma isotopic analysis and tritium analysis was performed on the deer sample. This sample was collected as part of a cooperative sampling effort with the KDHE. The sample location is identified on Figure 4.

II. DISCUSSION OF RESULTS Analysis results for pathways are summarized in Appendix B using the format described in Radiological Assessment Branch Technical Position, Revision 1, November 1979 (NRC Generic Letter 79-065). Results for individual samples are listed in Appendix C.

A. Airborne Pathway Chart 1 graphically illustrates weekly gross beta results for the sample year. Chart 2 represents the gross beta historical airborne smoothed averages of indicator sample locations and control sample locations. Charts 1 and 2 demonstrate how closely the indicator and control sample locations tracked together. Chart 2 reveals a seasonal cyclic trend; the gross beta values peak in the winter months (December or January) and decrease to a low point in the spring months (May or June). This trend is expected and is attributed to seasonal meteorological changes, i.e., changes in prevailing winds and precipitation.

The gross beta results of 2020 were compared to pre-operational monitoring results of 1983 and 1984. The weekly gross beta analyses range for 1983 and 1984 was 0.0064 to 0.084 pCi/m3.

The 2020 weekly gross beta analyses range for indicator locations was 0.009 to 0.050 pCi/m3.

The 2020 weekly gross beta analyses range was within the 1983 and 1984 pre-operational range. Additionally, the annual mean for indicator locations for 2020 (0.025 pCi/m3) was lower than the annual mean for 1983 (0.032 pCi/m3).

The gross beta results for the indicator locations were also compared to the control location.

The annual mean for indicator locations for 2020 (0.025 pCi/m3) was one point higher than the controlled location (0.024 pCi/m3). The indicator location with the highest gross beta annual mean was location 32, 37, and 49 (0.025 pCi/m3). Again, one point higher than the controlled location (0.024 pCi/m3).

Naturally occurring Be-7 activity was detected, as was the case during pre-operational monitoring. In 1984, the range for Be-7 detected activity was 0.024 to 0.211 pCi/m3 for indicator locations and the annual mean for indicator locations was 0.069 pCi/m3. In 2020, the range for Be-7 detected activity was 0.064 to 0.115 pCi/m3 for indicator locations and the annual mean for indicator locations was 0.089 pCi/m3. The control location annual mean for Be-7 detected activity (0.080 pCi/m3) was lower than the annual mean of the indicator locations (0.089 pCi/m3).

The indicator location with the highest annual mean of detected Be-7 activity was location 2 (0.094 pCi/ m3).

I-131 activity was not detected in the weekly analysis of radioiodine canisters at any location.

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The AP 07B-004 required lower limits of detection were met. Plant-related activation, corrosion, or fission products were not detected during 2020 in air particulate filters and radioiodine canisters. No unusual trends were noted.

B. Direct Radiation Pathway Quarterly OSL dosimeter results for each location are shown in Table 3. Measured values have been converted to a standardized 90-day quarter.

The annual mean of indicator sample locations in 2020 was 17.9 mR per standardized 90-day quarter. The annual mean of the control sample locations in 2020 was 19.1 mR per standardized 90-day quarter.

For pre-operational comparison, in 1981, the annual mean of indicator sample locations was 18.9 mR per standardized 90-day quarter and the annual mean for the control sample locations was 17.1 mR per standardized 90-day quarter. It should be noted WCGS changed from thermoluminescence dosimeters (TLD) to optically stimulated luminescence (OSL) dosimeters in 2008.

The indicator sample location with the highest annual mean was location 13 (20.3 mR per standardized 90-day quarter) which is slightly higher than the annual mean of the control sample locations (19.1 mR per standardized 90-day quarter).

Based upon Condition Report 00027489, improvements were made in measuring and subtracting transit dose in 2010. As expected, the OSL results increased during 2010 based on how transit dosimeters are handled. Chart 3 visibly displays the increase of the OSL results since 2010. Chart 3 also displays how closely the indicator and control location OSL dosimeter results are for 2018. Condition Report 00128355 was written to reduce data elimination based on standard deviation starting in Quarter 3 of 2018. In 2020 no change in trend was noted due to this change.

Chart 4 displays the TLD nearsite sample locations (1, 2, 7-9, 11-14, 18, 26, 27, 29, 30, 37, and

38) and the control sample locations (locations 39 and 48) for the preoperational years through 2007.

C. Waterborne Pathway (1) Surface Water Tritium, attributable to WCGS operation, was detected in surface water samples collected from the Coffey County Lake spillway (SP) indicator sample location. The annual mean for detected tritium activity at the SP location was 10,597 pCi/L and the range was 8,972 to 11,991 pCi/L.

The detected tritium activity was below the 30,000 pCi/L AP 07B-004 reporting level. Chart 5 illustrates the yearly average of surface water tritium data for the SP location. Chart 5 indicates the average tritium concentration of the SP location has increased slightly from last year. Tritium activity was not detected in samples obtained from the John Redmond Reservoir (JRR) control sample location.

During pre-operational radiological environmental monitoring, measured radiological activity was not detected in surface water samples.

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The AP 07B-004 required lower limits of detection were met. Radionuclides were not detected by the gamma isotopic analyses or by Fe-55 analyses.

Tritium was the only activity detected during 2020 in surface water samples and no unusual trends were noted.

(2) Ground Water The AP 07B-004 required lower limits of detection were met for I-131, tritium and gamma isotopic analyses. Radioactivity was not detected in any ground water samples. No unusual trends were noted. Plant-related activation, corrosion or fission products were not detected during 2020 in ground water samples.

(3) Drinking Water Gross beta activity was detected in drinking water samples collected from the indicator sample location and in samples collected from the control sample location. The annual mean of the indicator sample location gross beta activity (2.392 pCi/L) was slightly higher when compared to the annual mean of the control sample location gross beta activity (2.013 pCi/L). The 2020 annual means of gross beta activity for both the indicator and control sample locations were lower than those of the pre-operational monitoring year of 1984. In 1984, the annual mean of the indicator sample location gross beta activity was 7.5 pCi/L and the annual mean of the control sample location gross beta activity was 6.4 pCi/L.

Chart 6 illustrates the drinking water gross beta results for the last five years and how closely the gross beta results compared for the indicator and control sample locations.

No tritium was detected in the indicator sample location during 2020. No release limits were exceeded, and results were well below required detection limits. No other radionuclides were detected by the gamma isotopic analyses of the indicator or control location samples.

The AP 07B-004 required lower limits of detection were met. Plant-related activation, corrosion, or fission products were not detected during 2020 in drinking water samples and no unusual trends were noted.

(4) Shoreline Sediment Naturally occurring K-40 was detected in shoreline sediment samples collected from the DC (indicator sample location) and JRR (control sample location). K-40 was also detected during pre-operational shoreline sediment monitoring.

No other radionuclides were detected in the DC or JRR shoreline sediment samples during 2020. The AP 07B-004 required lower limits of detection were met. Plant-related activation, corrosion, or fission products were not detected during 2020 in shoreline sediment samples and no unusual trends were noted.

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D. Ingestion Pathway (1) Milk Milk was not collected during the sample year since no indicator locations within five miles of the plant were identified during the 2020 Land Use Census.

(2) Fish Naturally occurring K-40 activity was detected in fish samples obtained from the Coffey County Lake (CCL) indicator sample location and in fish samples obtained from the JRR control sample location. K-40 activity was also detected during pre-operational fish monitoring.

Fish samples were also analyzed for tritium. Fish samples collected from Coffey County Lake had tritium activity detected annual mean (9,110 pCi/kg). The detected tritium activity was attributable to plant operation. An adult consuming 21 kilograms of fish, at the maximum measured tritium concentration (12,561 pCi/kg), would receive a committed effective dose equivalent of 0.017 mRem.

Tritium activity was not detected in the control location samples collected from JRR.

No other radionuclides were detected in fish samples during 2020. The AP 07B-004 required lower limits of detection were met and no unusual trends were noted.

(3) Broadleaf Vegetation Gamma analyses of broadleaf vegetation samples obtained from indicator and control sample locations detected naturally occurring Be-7 and K-40. Be-7 and K-40 activity were also detected pre-operationally.

No other radionuclides were detected in broadleaf vegetation samples collected during the year.

The AP 07B-004 required lower limits of detection were met. Plant-related activation, corrosion, or fission products were not detected during 2020 in broadleaf vegetation samples and no unusual trends were noted.

(4) Crop Samples Gamma analysis detected naturally occurring K-40 activity to be present in the samples collected from the indicator sample locations and in the samples collected from the control sample location. K-40 activity was also detected during pre-operational crop monitoring. K-40 was the only activity detected in the crop samples.

The AP 07B-004 required lower limits of detection were met. Plant-related activation, corrosion, or fission products were not detected during 2020 in crop samples and no unusual trends were noted.

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E. Additional Samples Collected (not required by AP 07B-004)

(1) Bottom Sediment Gamma analysis detected naturally occurring K-40 activity to be present in the samples collected from the indicator sample locations and in the samples collected from the control sample location. K-40 activity was also detected during pre-operational bottom sediment monitoring.

Cs-137 activity was detected in the EEA sample we took (124.8 pCi/kg). Cs-137 was not detected in two samples obtained from control location JRR.

Cs-137 activity was detected in pre-operational samples. The Cs-137 activity detected in 2020 indicator sample location bottom sediment samples was within the pre-operational range.

Cs-137 activity detected in 1981 and 1982 was in the range of 79 to 953 pCi/kg. The decay corrected range of pre-operational Cs-137 activity detected is approximately 32 to 380 pCi/kg.

The detected Cs-137 activity in the sample collected from the indicator sample locations was likely due to fallout since the measured activity is within the decay corrected range of pre-operational Cs-137 detected activity.

Chart 7 plots the Cs-137 detected activity from the discharge cove indicator sample location and JRR control sample location bottom sediment samples. The detected Cs-137 activity measured from the discharge cove location reflects a decreasing trend. The Chart 7 trendline indicates Cs-137 activity detected at the JRR control location has also been decreasing. Chart 7 also displays that in recent years, the detected Cs-137 activity for the JRR and DC sample locations overlap.

Fe-55 activity was not detected in the two samples obtained from indicator sample locations.

No other radionuclides were detected in bottom sediment samples. Plant-related activation, corrosion, or fission products were not detected during 2020 in bottom sediment samples and no unusual trends were noted.

(2) Aquatic Vegetation Gamma analyses of aquatic vegetation samples obtained from indicator sample locations detected naturally occurring Be-7 and K-40. Be-7 and K-40 activity were also detected during pre-operational monitoring.

No other radionuclides were detected in aquatic vegetation samples. Plant-related activation, corrosion, or fission products were not detected during 2020 in aquatic vegetation samples and no unusual trends were noted.

(3) Terrestrial Vegetation Naturally occurring Be-7 and K-40 activity were detected in the terrestrial vegetation indicator location samples. No other radionuclides were detected in terrestrial vegetation. Plant-related activation, corrosion or fission products were not detected during 2020 in terrestrial vegetation and no unusual trends were noted.

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(4) Soil Naturally occurring K-40 activity was detected in the soil sample that was collected from the indicator location. K-40 activity was also detected during pre-operational soil monitoring.

Cs-137 activity was also detected in the one sample we took in 2020 (154.9 pCi/kg). Data was reviewed for soil samples collected pre-operationally. The detected Cs-137 activity range from February of 1985 was 255 to 2,160 pCi/kg. The decay corrected range of pre-operational Cs-137 activity detected in soil is approximately 102 to 862 pCi/kg. The detected Cs-137 activity in soil sampled in 2020 is below and within the decay corrected pre-operational range and is likely due to fallout.

Plant-related activation, corrosion, or fission products were not detected during 2019 in soil samples and no unusual trends were noted.

(5) Turkey (Ingestion Pathway)

Naturally occurring K-40 activity was detected in the turkey sample obtained from the indicator location. No tritium activity was detected in the turkey sample. No activity was attributable to plant operation.

(6) Deer (Ingestion Pathway)

Naturally occurring K-40 activity was detected in the deer sample obtained from the indicator location.

Tritium activity (2601.0 pCi/kg) was also detected in the deer sample. The detected tritium activity was attributable to plant operation.

An adult consuming 72.6 kilograms of deer meat, at the measured tritium concentration (2601.0 pCi/kg), would receive a committed effective dose equivalent of 0.012 mRem.

No other radionuclides were detected in the deer sample. No unusual trends were identified.

III. PROGRAM REVISIONS/CHANGES No revisions or changes were made to AP 07B-004, Offsite Dose Calculation Manual (Radiological Environmental Monitoring Program) during 2020.

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IV. PROGRAM DEVIATIONS Air Samples The following air sample locations failed to meet the requirement for continuous sampler operation. As described in footnote (1) of procedure AP 07B-004, Offsite Dose Calculation Manual (Radiological Environmental Monitoring Program), Table 5-1, deviations are permitted from the required sampling schedule due to malfunction of sampling equipment and other legitimate reasons.

Ground Water Protection The following information is being provided in association with the Nuclear Energy Institute (NEI) Groundwater Protection Industry Initiative:

Describe offsite ground water or surface water sample results that exceeded the REMP reporting criteria that were voluntarily communicated to State/Local officials during the calendar year - None.

V. INTERLABORATORY COMPARISON PROGRAM Environmental, Inc., Midwest Laboratory was contracted to perform radiological analysis of environmental samples for WCNOC. The laboratory participated in the intercomparison studies administered by Environmental Resource Associates, Inc. Appendix A is the Interlaboratory Comparison Program Results for Environmental, Inc., Midwest Laboratory. Intercomparison results, in-house spikes, blanks, duplicates and mixed analyte performance evaluation program results are also contained in Appendix A.

VI. COMPARISON TO THE RADIOACTIVE EFFLUENT RELEASE PROGRAM As described in the section discussing radioisotopes found in fish from Coffey County Lake, dose that may be received as a result of tritium released from WCGS is comparable with the theoretical doses calculated by the Radioactive Effluent Release Program.

The theoretical doses calculated by the Radioactive Effluent Release Program assume a person drinks the water from Coffey County Lake and eats the fish from Coffey County Lake. Based upon these assumptions the dose to man from both pathways was calculated to be 0.160 mRem for 2020.

Using sample data obtained from the REMP, an adult drinking 2 liters per day of surface water from Coffey County Lake, using the average tritium activity (10,450 pCi/L), would receive a committed effective dose equivalent of 0.484 mRem per year. For an adult eating 21 kg of fish per year from Coffey County Lake, using the average tritium activity (9,291 pCi/kg), would receive a committed effective dose equivalent of 0.012 mRem per year. Based upon the REMP results, the dose from both pathways was calculated to be 0.496 mRem per year.

It should be noted Coffey County Lake is not used as a drinking water source. Calculating the dose to man for tritium detected in the Coffey County Lake surface water is for comparison purposes only.

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The tritium dose values are being compared on a qualitative basis. It is not expected that the annual doses, as calculated in the Radioactive Effluent Release Report, would compare directly to those calculated from the REMP. The Radioactive Effluent Release Report provides a snap shot of potential dose resulting from the year's releases. The REMP data indicates the accumulated result of releasing tritium into the lake since the start of plant operation.

VII. Condition reports on REMP for 2020 First quarter REMP data lost due to damaged dosimeters. (CR# 00141671)

REMP Air Particulate Sample location 53 melted the outlet. (CR# 00141691)

REMP Horseradish dead at control location D-2. (CR# 00142656)

Digital Flow Meter Linerity Check. (CR# 00143723)

Error indentified in the 2019 AREOR. (CR# 00143767)

REMP sample cooler not shipped. (CR# 00146113)

Tritium above 10,000 pCi/L in 1DW0003. (CR# 141067)

REMP Air Sample loose from power pole. (CR# 00144633) 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 11 of 32

TABLE 1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM DESCRIPTION (SAMPLE COLLECTION SPECIFIED BY AP 07B-004)

EXPOSURE NUMBER OF SAMPLE COLLECTION TYPE AND PATHWAY/ SAMPLES AND FREQUENCY FREQUENCY OF SAMPLE TYPE SAMPLE LOCATIONS ANALYSIS AIRBORNE (See Figures 1 & 5)

Radioiodine and Samples from six Continuous sampler Analyze radioiodine Particulates locations operation with sample canister weekly for collection weekly, or more I-131 frequently if required, by dust loading.

Samples from locations Analyze particulate near the site boundary filter weekly for in three sectors having gross beta activity; the highest calculated perform quarterly annual average D/Q gamma isotopic and one supplemental analysis composite location (Locations 2, (by location) 18, 37, or 49 on Figure 1)

Sample from the vicinity of a community having the highest calculated annual average D/Q (Location 32 on Figure 1, New Strawn)

Sample from a control location 9.5 to 18.5 miles distant in a low ranked D/Q sector (Location 53 on Figure 5) 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 12 of 32

TABLE 1 (Cont.)

EXPOSURE NUMBER OF SAMPLE COLLECTION TYPE AND PATHWAY/ SAMPLES AND FREQUENCY FREQUENCY OF SAMPLE TYPE SAMPLE LOCATIONS ANALYSIS DIRECT (See Figures 2 & 5)

RADIATION 44 routine monitoring Quarterly Gamma dose stations with two or quarterly more dosimeters measuring dose continuously, placed as follows:

An inner ring of stations, one in each meteorological sector 0-3 mile range from the site (Locations 1, 7, 9, 11-13, 18, 26, 27, 29, 30, 37, 38, 41, 42, 43, 46, 49, 55, & 54 on Figure 2).

An outer ring of stations, one in each meteorological sector in the 3 to 5 mile range from the site (Locations 4, 5, 15-17, 19, 22-25, 32, 34-36, 50 & 51 on Figure 2). Four sectors

[A, B, G & J] contain an additional station (Locations 2, 8, 14 &

20).

The balance of the stations to be placed in special interest areas such as population centers (Locations 23, 32 & 52), nearby residences 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 13 of 32

TABLE 1 (Cont.)

EXPOSURE NUMBER OF SAMPLE COLLECTION TYPE AND PATHWAY/ SAMPLES AND FREQUENCY FREQUENCY OF SAMPLE TYPE SAMPLE LOCATIONS ANALYSIS DIRECT RADIATION (cont.)

(many locations are near a residence),

schools (Locations 23

& 52), Wilson Cadman Wildlife Education Area (44), CCL Public Fishing Area (46) and in two areas to serve as control stations 10-20 miles distant from the site (Locations 39 and 53 on Figure 5).

WATERBORNE (See Figure 3)

Surface One sample upstream Monthly grab sample Monthly gamma (Location JRR on isotopic analysis and Figure 3) and one composite for tritium sample downstream analysis quarterly (Location SP on Figure 3).

Ground Samples from one or Quarterly grab sample Quarterly gamma two sources only if isotopic analysis and likely to be affected. tritium analysis Indicator samples at locations hydrologically down-gradient of the site (Locations C-10, C-49, F-1, G-2, J-1 and J-2 on Figure 3);

control sample at a location hydrologically upgradient of the site (Location B-12 on Figure 3).

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TABLE 1 (Cont.)

EXPOSURE NUMBER OF SAMPLE COLLECTION TYPE AND PATHWAY/ SAMPLES AND FREQUENCY FREQUENCY OF SAMPLE TYPE SAMPLE LOCATIONS ANALYSIS WATERBORNE (cont.)

Drinking Sample of municipal Monthly Composite Monthly gamma water supply at an isotopic analysis and indicator location gross beta analysis downstream of the of composite Neosho River-Wolf sample. Quarterly Creek confluence tritium analysis of (Location IO-DW on composites.

Figure 5); control sample from location upstream of the Neosho River-Wolf Creek confluence (Location BW-15 on Figure 3).

Shoreline One sample from the Semiannually Semiannual gamma Sediment vicinity of Coffey isotopic analysis County Lake discharge cove (Location DC on Figure 3); control sample from John Redmond Reservoir (Location JRR on Figure 3).

INGESTION (See Figures 4 & 5)

Milk Samples from milking Semimonthly April to Gamma isotopic animals at three November; monthly analysis and I-131 indicator locations December-March analysis of each within 5 miles of the sample site having the highest dose potential (currently there are no locations producing milk for human consumption within 5 miles of the site); one sample from a control location greater than 10 miles from the site if indicator locations are sampled.

2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 15 of 32

TABLE 1 (Cont.)

EXPOSURE NUMBER OF SAMPLE COLLECTION TYPE AND PATHWAY/ SAMPLES AND FREQUENCY FREQUENCY OF SAMPLE TYPE SAMPLE LOCATIONS ANALYSIS INGESTION (cont.)

Fish Indicator samples of 1 Semiannually Gamma isotopic to 3 recreationally analysis on edible important species from portions Coffey County Lake; control samples of similar species from John Redmond Reservoir spillway (Figure 4).

Broadleaf Samples of available Monthly when available Gamma isotopic Vegetation broadleaf vegetation analysis on edible from two indicator portions locations (using the criteria from the Land Use Census section) with highest calculated annual average D/Q (Locations A-3 and Q-6 and alternate locations B-1, H-2, N-1 and R-2 on Figure 4); sample of similar broadleaf vegetation from a control location 9.5 to 18.5 miles distant in a low ranked D/Q sector (Location D-2 on Figure 5).

Irrigated Crops Sample of crops At time of harvest Gamma isotopic irrigated with water analysis on edible from the Neosho River portions downstream of the Neosho River - Wolf Creek confluence (locations will vary from year to year, e.g.,

Location NR-D1 and NR-D2 on Figure 5).

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TABLE 2 SAMPLE LOCATION IDENTIFIERS, DISTANCES (Miles) AND DIRECTIONS (Sectors)

Sample Type Location Distance from Direction Sector Identifier Reactor Air Particulates and Radioiodine 2 2.7 N A 18 3.0 SSE H 32 3.1 WNW P 37 2.0 NNW R 49 0.8 NNE B 53 10.8 ENE D Dosimeters 1 1.4 N A 2 2.7 N A 4 4.0 NNE B 5 4.1 NE C 7 2.1 NE C 8 1.7 NNE B 9 2.0 ENE D 11 1.7 E E 12 1.9 ESE F 13 1.6 SE G 14 2.5 SE G 15 4.6 ESE F 16 4.3 E E 17 3.7 SE G 18 3.0 SSE H 19 3.9 SSE H 20 3.3 S J 22 3.9 SSW K 23 4.3 SW L 24 4.1 WSW M 25 3.4 W N 26 2.4 WSW M 27 2.2 SW L 29 2.7 SSW K 30 2.5 W N 32 3.1 WNW P 34 4.4 NW Q 35 4.6 NNW R 36 4.2 N A 37 2.0 NNW R 38 1.2 NW Q 39 13.1 N A 41 0.8 NNW R 42 0.8 SSE H 43 0.7 WNW P 44 3.0 NNW R 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 17 of 32

TABLE 2 (Cont.)

SAMPLE LOCATION IDENTIFIERS, DISTANCES (Miles) AND DIRECTIONS (Sectors)

Sample Type Location Distance from Direction Sector Identifier Reactor Dosimeters 46 1.6 WNW P 49 0.8 NNE B 50 3.6 ENE D 51 4.3 S J 52 3.6 SW L 53 10.8 ENE D 54 0.18 S K 55 0.25 SSW L Surface Water JRR 3.7 W N SP 3.2 SSE H Ground Water B-12 1.9 NNE B C-10 2.7 W N C-49/L-49 2.8 SW L F-1 2.5 ESE F G-2 3.6 SE G J-1 3.8 S J J-2 4.3 S J Drinking Water BW-15 3.9 SW L IO-DW 26.1 SSE H Shoreline Sediment DC 0.8 WNW P EEA 3.0 NNW R JRR 3.6 W N SC 0.8 NNW R Fish CCL 0.6 E to NNW E to R JRR 3.7 W N Food/Garden A-3 2.6 N A B-1 0.8 NNE B D-2 14.8 ENE D H-2 3.0 SSE H Q-6 2.4 NW Q Crops NR-D1 8.9 S J NR-D2 11.5 S J NR-U1 4.0 SSW K Bottom Sediment DC 0.9 WNW P EEA 3.0 NNW R ESW 0.5 E E JRR 3.7 W N MUDS 1.5 WNW P UHS 0.6 E E Aquatic Vegetation DC ALT 1.5 NW Q EEA 3.0 NNW R MUDS 1.5 WNW P SC 0.8 NNW R 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 18 of 32

TABLE 2 (Cont.)

SAMPLE LOCATION IDENTIFIERS, DISTANCES (Miles) AND DIRECTIONS (Sectors)

Sample Type Location Distance from Direction Sector Identifier Reactor Terrestrial Vegetation EEA 3.0 NNW R MUDS 1.5 WNW P Soil EEA 3.0 NNW R MUDS 1.5 WNW P Meat (Turkey) R3.9 3.9 NNE R Meat (Deer) G1.8 1.8 SE G 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 19 of 32

TABLE 3 OSL Dosimeter Results (mR/Standardized 90-day Quarter)

Location Qtr. 1 Qtr. 2 Qtr. 3 Qtr. 4 Total Annual (mR) (mR) (mR) (mR) Exposure (mR) 1 16.6 17.8 22.0 21.9 78.3 2 18.1 18.8 16.8 17.8 71.5 4 17.4 19.4 19.7 19.1 75.6 5 14.5 17.8 16.4 16.3 65.0 7 17.0 16.8 17.4 19.4 67.6 8 17.4 20.1 23.6 19.7 80.8 9 16.7 14.8 16.8 18.4 66.7 11 17.0 20.1 18.1 20.6 75.8 12 17.8 17.8 19.4 20.0 75.0 13 19.9 18.1 21.0 22.2 81.2 14 18.5 19.8 20.0 21.0 79.3 15 17.0 20.1 20.0 19.1 76.2 16 16.7 18.1 19.1 19.1 73.0 17 18.1 17.8 17.1 20.0 73.0 18 18.1 18.1 17.5 17.5 71.2 19 16.3 18.8 20.1 19.4 74.6 20 18.8 18.5 16.8 19.7 73.8 22 17.4 19.8 19.7 21.2 78.1 23 17.7 17.8 17.5 18.8 71.8 24 15.5 18.1 17.8 18.4 69.8 25 16.3 15.2 18.7 17.2 67.4 26 17.4 14.5 16.1 18.1 66.1 27 13.4 17.1 21.7 20.0 72.2 29 17.0 13.8 14.2 17.1 62.1 30 15.5 19.1 19.4 16.6 70.6 32 16.3 17.5 17.8 19.1 70.7 34 17.4 19.4 20.7 19.9 77.4 35 17.0 18.5 20.0 18.8 74.3 36 14.1 16.1 21.0 19.1 70.3 37 15.9 16.1 20.0 19.1 71.1 38 14.1 17.7 19.7 21.9 73.4 39 17.8 16.8 18.1 17.1 69.8 41 11.6 18.8 20.4 20.3 71.1 42 9.1 9.9 10.9 12.5 42.4 43 17.7 11.5 13.2 13.4 55.8 44 18.1 18.1 17.4 19.4 73.0 46 14.8 18.8 19.7 20.6 73.9 49 17.4 14.2 15.2 17.2 64.0 50 17.7 17.8 20.7 21.2 77.4 51 17.7 17.8 19.7 20.0 75.2 52 17.0 18.1 21.7 23.1 79.9 53 15.2 19.4 17.4 20.6 72.6 54 15.6 18.5 17.4 20.9 72.4 55 16.3 17.1 17.7 20.0 71.1 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 20 of 32

FIGURE 1 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 21 of 32

FIGURE 2 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 22 of 32

FIGURE 3 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 23 of 32

FIGURE 4 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 24 of 32

FIGURE 5 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 25 of 32

CHART 1 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 26 of 32

CHART 2 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 27 of 32

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CHART 7 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page 32 of 32

APPENDIX A INTERLABORATORY AND INTRALABORATORY COMPARISON PROGRAM RESULTS NOTE: 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 Interlaboratory/ Intralaboratory 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 laboratorys 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, 0.8 to 1.2 Strontium-90 Potassium-40 0.8 to 1.2 Gross alpha 0.5 to 1.5 Gross beta 0.8 to 1.2 Tritium 0.8 to 1.2 Radium-226, 0.7 to 1.3 Radium-228 Plutonium 0.8 to 1.2 Iodine-129, 0.8 to 1.2 Iodine-131 Nickel-63, 0.7 to 1.3 Technetium-99, Uranium-238 Iron-55 0.8 to 1.2 Other Analyses 0.8 to 1.2 A-2

TABLE A-1. Interlaboratory Comparison Crosscheck program, Environmental Resource Associates (ERA) a.

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 I-131 27.8 +/- 1.2 26.1 21.7 - 30.8 Pass a

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.

c 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

TABLE A-2. Interlaboratory 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 I-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 NYW-3337 9/15/2020 Cs-137 147 +/-7 134 121 - 150 Pass a

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 overlaped upper acceptance limit. Lab will continue to monitor results going forward for trends.

A-4

TABLE A-3. Thermoluminescent Dosimetry, (TLD, CaSO4: Dy Cards).a 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)K a = 1.20 . mrem/cGy = 1000.

c Performance Quotient (P) is calculated as ((reported dose - conventially true value) ÷ conventially true value) where the conventially 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

TABLE A-3. Thermoluminescent Dosimetry, (TLD, CaSO4: Dy Cards).a mrem Lab Code Irradiation Delivered Reportedb Performancec 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 Passd Standard Deviation (Spike 21-40) 4.6 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)K a = 1.20 . mrem/cGy = 1000.

c Performance Quotient (P) is calculated as ((reported dose - conventially true value) ÷ conventially true value) where the conventially 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. Intralaboratory "Spiked" Samples Concentrationa b

Lab Code Date Analysis Laboratory results Known Control Ratio 2s, n=1c 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 a

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), MI (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. Intralaboratory "Spiked" Samples Concentrationa Lab Codeb Date Analysis Laboratory results Known Control Ratio 2s, n=1c 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 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 a

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), MI (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-8

TABLE A-4. Intralaboratory "Spiked" Samples Concentrationa Lab Codeb Date Analysis Laboratory results Known Control Ratio 2s, n=1c 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 1,688 - 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 a

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), MI (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-9

TABLE A-5. Intralaboratory "Blank" Samples Concentrationa b c Lab Code Sample Date Analysis Laboratory results (4.66s) Acceptance Type LLD Activityd Criteria (4.66 s)

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 I-131 0.47 -0.22 +/- 0.21 1 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 1 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 I-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 1 SPW-1499 Water 5/18/2020 Ra-228 0.88 0.03 +/- 0.41 2 SPW-1541 Water 5/19/2020 I-131 0.20 0.00 +/- 0.11 1 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 a

Liquid sample results are reported in pCi/Liter, air filters ( pCi/m 3), charcoal (pCi/charcoal canister), and solid samples (pCi/g).

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

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

d Activity reported is a net activity result.

A-10

TABLE A-5. Intralaboratory "Blank" Samples Concentrationa b c Lab Code Sample Date Analysis Laboratory results (4.66s) Acceptance Type LLD Activityd Criteria (4.66 s)

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 1 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 8/7/2020 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 I-131 0.42 -0.04 +/- 0.22 1 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 ( pCi/m 3), charcoal (pCi/charcoal canister), and solid samples (pCi/g).

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

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

d Activity reported is a net activity result.

A-11

TABLE A-6. Intralaboratory "Duplicate" Samples Concentrationa 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-868,869 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. Intralaboratory "Duplicate" Samples Concentrationa 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. Intralaboratory "Duplicate" Samples Concentrationa 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. Intralaboratory "Duplicate" Samples Concentrationa Averaged Lab Codeb Date Analysis First Result Second Result Result Acceptance SW-3515,3516 10/1/2020 H-3 154 +/- 86 111 +/- 84 133 +/- 60 Pass DW-20141,20142 10/1/2020 Ra-226 1.34 +/- 0.16 1.39 +/- 0.16 1.37 +/- 0.11 Pass DW-20141,20142 10/1/2020 Ra-228 1.74 +/- 0.62 2.09 +/- 0.64 1.92 +/- 0.45 Pass SW-3536,3537 10/5/2020 H-3 376 +/- 97 378 +/- 97 377 +/- 68 Pass WW-3727,3728 10/8/2020 H-3 152 +/- 82 190 +/- 84 171 +/- 59 Pass VE-3748,3749 10/12/2020 K-40 3.07 +/- 0.25 2.88 +/- 0.26 2.98 +/- 0.18 Pass VE-3769,3770 10/12/2020 Be-7 0.80 +/- 0.31 0.51 +/- 0.15 0.66 +/- 0.17 Pass VE-3769,3770 10/12/2020 K-40 5.69 +/- 0.61 5.79 +/- 0.39 5.74 +/- 0.36 Pass WW-4092,4093 10/13/2020 H-3 6,484 +/- 252 6,275 +/- 248 6,380 +/- 177 Pass WW-3838,3839 10/14/2020 H-3 313 +/- 90 263 +/- 88 288 +/- 63 Pass WW-4394,4395 11/3/2020 H-3 161 +/- 83 199 +/- 85 180 +/- 60 Pass WW-4587,4588 11/4/2020 H-3 6,468 +/- 252 6,638 +/- 255 6,553 +/- 179 Pass WW-4524,4525 11/5/2020 H-3 160 +/- 86 131 +/- 84 145 +/- 60 Pass VE-4415,4416 11/24/2020 Be-7 0.28 +/- 0.08 0.22 +/- 0.07 0.25 +/- 0.05 Pass VE-4415,4416 11/24/2020 K-40 2.25 +/- 0.21 2.20 +/- 0.19 2.23 +/- 0.14 Pass AP-4845,4846 12/31/2020 Be-7 0.07 +/- 0.01 0.06 +/- 0.02 0.06 +/- 0.01 Pass Note: Duplicate analyses are performed on every twentieth sample received. Results are not listed for those analyses with activities that measure below the LLD.

a 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).

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

DW (Drinking Water), E (Egg), F (Fish), G (Grass), LW (Lake Water), MI (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

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

Concentrationa Reference Known Control b

Lab Code 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 I-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 f 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

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

Concentrationa Reference Known Control b

Lab Code 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 c

MAVE-668 2/1/2020 Co-57 0.02 +/- 0.03 0 NA 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 MAAP-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 NA c Pass A-17

TABLE A-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-3177 8/1/2020 Cs-134 1.28 +/- 0.05 1.83 1.28 - 2.38 Failg MAAP-3177 8/1/2020 Cs-137 0.981 +/- 0.068 0.996 0.697 - 1.295 Pass MAAP-3177 8/1/2020 Co-57 0.020 +/- 0.027 0 NA c Pass MAAP-3177 8/1/2020 Co-60 1.57 +/- 0.06 1.73 1.21 - 2.25 Pass MAAP-3177 8/1/2020 Mn-54 0.751 +/- 0.077 1.400 0.98 - 1.82 Failh MAAP-3177 8/1/2020 Zn-65 2.07 +/- 0.15 2.00 1.40 - 2.60 Pass MAVE-3185 8/1/2020 Cs-134 4.73 +/- 0.10 4.94 3.46 - 6.42 Pass MAVE-3185 8/1/2020 Cs-137 0.03 +/- 0.06 0 NA c Pass MAVE-3185 8/1/2020 Co-57 7.83 +/- 0.12 6.67 4.67 - 8.67 Pass MAVE-3185 8/1/2020 Co-60 4.41 +/- 0.10 4.13 2.89 - 5.37 Pass MAVE-3185 8/1/2020 Mn-54 6.52 +/- 0.18 5.84 4.09 - 7.59 Pass MAVE-3185 8/1/2020 Zn-65 7.26 +/- 0.19 6.38 4.47 - 8.29 Pass 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).

c 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.

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 satisifactory.

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

f 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.

g Lab result barely missed lower contol limit.

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

A-18

TABLE A-8. Interlaboratory Comparison Crosscheck Program, Environmental Resource Associates (ERA) a.

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 a

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

Appendix B Summary Tables in the format of NRC Radiological Assessment Branch Technical Position Revision 1, November 1979 Page B-1

RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Name of Facility: Wolf Creek Generating Station Docket No.: 50-482 Location of Facility: Coffey County, Kansas Reporting Period: Annual 2020 Medium of ODCM All Indicator Indicator Location with Control Locations Pathway Analysis and Lower Locations Highest Annual Mean Number of Sampled Total Number of Limit of Name Nonroutine (Unit of Analysis Performed Detection ** Mean (f) Distance and ** Mean (f) ** Mean (f) Reported Measurement) (LLD) ** Range Direction ** Range ** Range Measurements **

Air Particulate Station 53 (pCi/m3) Gross Beta (318) 0.01 0.025 (265/265) 32,49 0.025 (53/53) 0.025 (53/53) 0 (0.009 - 0.050) 3.1 miles WNW (0.010 - 0.050) (0.010 - 0.045) 0.8 miles NNE Air Radioiodine (pCi/m3) Gamma (24) - 0.089 (20/20) 2 0.081 (4/4) 0.080 (4/4) 0 Be-7 (0.064 - 0.115) 2.7 miles N (0.064 - 0.103) (0.056 - 0.100)

Station 53 I-131 (318) 0.07 - (0/265) N/A N/A - (0/53) 0 Direct Radiation Stations 39 & 53 Dosimeters (mR per std. Gamma Dose - 17.9(168/168) 13 18.1 (4/4) 19.1 (8/8) 0 90-day Qtr.) (176) (9.1 - 23.6) 1.6 miles SE (18.1 - 22.2) (15.2 - 23.1)

Surface Water JRR (pCi/l) Gamma (24) - (0/12) N/A N/A - (0/12) 0 Tritium (24) 30,000 10,597 (12/12) SP 10,597 (12/12) - (0/12) 0 (8,972 - 11,991) 3.2 miles SSE (8,972 - 11,991)

Fe-55 (8) - - (0/4) N/A N/A - (0/4) 0 Ground Water B-12 (pCi/l) I-131 (32) 1 - (0/28) N/A N/A - (0/4) 0 Gamma (32) - (0/28) N/A N/A - (0/4) 0 Tritium (32) 20,000 - (0/28) N/A N/A - (0/4) 0 Page B-2

• • Mean and range based upon detectable measurements only. Fraction of detectable measurements at specified locations is indicated in parentheses (f)

RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Name of Facility: Wolf Creek Generating Station Docket No.: 50-482 Location of Facility: Coffey County, Kansas Reporting Period: Annual 2020 Medium of ODCM All Indicator Indicator Location with Control Locations Pathway Analysis and Lower Locations Highest Annual Mean Number of Sampled Total Number of Limit of Name Nonroutine (Unit of Analysis Performed Detection ** Mean (f) Distance and ** Mean (f) ** Mean (f) Reported Measurement) (LLD) ** Range Direction ** Range ** Range Measurements **

Drinking BW-15 Water I-131 (24) 1 - (0/12) N/A N/A - (0/12) 0 (pCi/l)

Gross Beta (24) 4 2.4 (12/12) IO-DW 2.4 (12/12) 2.0 (12/12) 0 (1.1 - 3.3) 26.1 miles SSE (1.1 - 3.3) (1.4 - 3.1)

Gamma (24) - (0/12) N/A N/A - (0/12) 0 Tritium (8) 2,000 - (0/4) N/A - (1/4) - (0/4) 0 Shoreline Gamma (4) JRR Sediment (pCi/kg dry) K-40 - 7,234 (2/2) DC 7,234 (2/2) 8,578 (2/2) 0 (5,674 - 8,794) 0.8 miles WNW (5,674 - 8,794) (7,827 - 9,328)

Cs-137 - (0-2) N/A N/A (0-2) 0 Fish - Flesh Gamma (23) JRR (pCi/kg wet)

K-40 - 3,944 (13/13) CCL 3,944 (13/13) 4,133(10/10) 0 (3,304 - 4,971) 0.6 miles E to (3,304 - 4,971) (3,291- 5,196)

NNW Tritium (23) - 9,110 (13/13) CCL 9,110 (13/13) - (0/10) 0 (6,907 - 12,561) 0.6 miles E to (6,907 - 12,561)

NNW Page B-3

• • Mean and range based upon detectable measurements only. Fraction of detectable measurements at specified locations is indicated in parentheses (f)

RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Name of Facility: Wolf Creek Generating Station Docket No.: 50-482 Location of Facility: Coffey County, Kansas Reporting Period: Annual 2020 Medium of ODCM All Indicator Indicator Location with Control Locations Pathway Analysis and Lower Locations Highest Annual Mean Number of Sampled Total Number of Limit of Name Nonroutine (Unit of Analysis Performed Detection ** Mean (f) Distance and ** Mean (f) ** Mean (f) Reported Measurement) (LLD) ** Range Direction ** Range ** Range Measurements **

Food and Gamma (23) D-2 Garden (pCi/kg wet) Be-7 - 1,160 (18/18) Q-6 1,268(2/2) 1,028 (5/5) 0 (441 - 2,277) (852 - 1,685) (551 - 1,747)

K-40 - 6,157 (18/18) A-3 7,875 (4/4) 7,569 (5/5) 0 (2,845 - 9,460) 2.6 miles N (5,477 - 9,460) (5,883 - 10,478)

Crops Gamma (4) NR-D1 (pCi/kg wet)

K-40 - 6,914 (3/3) NR-U1 14,538 (1/1)18-345 (1/1) 0 (2,651-14,538) 4.0 miles SSW (14,538-14,538) (18,435-18,435)

Bottom Gamma (4) JRR Sediment (pCi/kg dry)

K-40 - 9,814 (2/2) DC 9,814 (2/2) 13,007 (2/2) 0 (8,345-11,282) 0.9 miles WNW (8,345-11,282) (12,966 - 13,048)

Cs-137 - 33 (1/2) DC 33 (1/2) - (0/2) 0 (33 - 33) 0.9 miles WNW (33 - 33)

Fe-55 (2) - - (0/2) N/A N/A No Control 0 Page B-4

• • Mean and range based upon detectable measurements only. Fraction of detectable measurements at specified locations is indicated in parentheses (f)

RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Name of Facility: Wolf Creek Generating Station Docket No.: 50-482 Location of Facility: Coffey County, Kansas Reporting Period: Annual 2020 Medium of ODCM All Indicator Indicator Location with Control Locations Pathway Analysis and Lower Locations Highest Annual Mean Number of Sampled Total Number of Limit of Name Nonroutine (Unit of Analysis Performed Detection ** Mean (f) Distance and ** Mean (f) ** Mean (f) Reported Measurement) (LLD) ** Range Direction ** Range ** Range Measurements **

Gamma (3)

Aquatic No Control Be-7 - 552 (3/3) EEA 702 (1/1)

Vegetation (pCi/kg wet) (267 - 702) 3.0 miles NNW (702 - 702) - 0 K-40 - 3,458 (3/3) SC 4,449 (1/1)

(2,797- 4,449) 0.8 miles NNW (4,449 - 4,449) - 0 Cs-137 - - (0/3) N/A N/A - 0 Gamma (2)

Terrestrial - 1,377 (2/2) MUDS 2,262 (1/1) No Control Vegetation Be-7 (493 - 2,262) 1.5 miles WNW (2,262 - 2,262)

(pCi/kg wet) - 0 K-40 - 5,116 (2/2) EEA (2,715 - 7,517) 7,517 (1/1) 3.0 miles NNW (7,517 - 7,517) - 0 Gamma (1)

Soil - 12,640 (1/1) EEA No Control K-40 (12,640-12,640) 12,640 (1/1)

(pCi/kg dry) 3.0 miles NNW (12,640-12,640)

- 0 Cs-137 - 155 (1/1)

EEA 155 (1/1)

(155-155) (155-155) 3.0 miles NNW

- 0 Gamma (2)

- 3,592 (2/2) R3.9 (Turkey) No Control Meat 3,592 (2/2)

K-40 (3,278 - 3,906) (3,278 - 3,906)

(pCi/kg wet) 3.9 miles NNW - 0 Deer/Turkey

- 2,601 (1/1) G1.8 (Deer) 2,601 (1/1)

Tritium No Control 0 (2,601-2,601) 1.8 miles SE (2,601-2,601)

Page B-5

• • Mean and range based upon detectable measurements only. Fraction of detectable measurements at specified locations is indicated in parentheses (f)

APPENDIX C INDIVIDUAL SAMPLE RESULTS 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station

Air Particulate Filters and Radioiodine Canisters Location: 002 Collection Collection Volume Gross Beta I-131 Duplicate StartDate EndDate m3 Concentration Concentration Analysis (pCi/m3) (pCi/m3) 30-Dec-19 07-Jan-20 344 0.019 +/- 0.004 < 0.012 30-Dec-19 07-Jan-20 344 0.020 +/- 0.004 Duplicate 07-Jan-20 13-Jan-20 261 0.020 +/- 0.005 < 0.015 13-Jan-20 20-Jan-20 308 0.035 +/- 0.005 < 0.012 20-Jan-20 27-Jan-20 287 0.025 +/- 0.005 < 0.011 27-Jan-20 03-Feb-20 300 0.020 +/- 0.004 < 0.010 03-Feb-20 10-Feb-20 308 0.016 +/- 0.004 < 0.009 10-Feb-20 17-Feb-20 306 0.020 +/- 0.004 < 0.015 17-Feb-20 24-Feb-20 315 0.023 +/- 0.004 < 0.012 24-Feb-20 02-Mar-20 304 0.016 +/- 0.004 < 0.010 02-Mar-20 09-Mar-20 300 0.011 +/- 0.004 < 0.010 09-Mar-20 16-Mar-20 308 0.015 +/- 0.004 < 0.016 16-Mar-20 23-Mar-20 293 0.015 +/- 0.004 < 0.016 23-Mar-20 30-Mar-20 299 0.020 +/- 0.004 < 0.011 30-Mar-20 06-Apr-20 304 0.023 +/- 0.004 < 0.018 06-Apr-20 13-Apr-20 298 0.027 +/- 0.005 < 0.015 13-Apr-20 20-Apr-20 296 0.027 +/- 0.004 < 0.009 20-Apr-20 27-Apr-20 301 0.020 +/- 0.004 < 0.011 27-Apr-20 04-May-20 293 0.020 +/- 0.004 < 0.010 04-May-20 11-May-20 310 0.014 +/- 0.004 < 0.012 11-May-20 18-May-20 297 0.018 +/- 0.004 < 0.012 18-May-20 26-May-20 334 0.014 +/- 0.004 < 0.006 18-May-20 26-May-20 334 0.010 +/- 0.004 Duplicate 26-May-20 01-Jun-20 255 0.015 +/- 0.005 < 0.007 01-Jun-20 08-Jun-20 294 0.024 +/- 0.004 < 0.010 08-Jun-20 15-Jun-20 301 0.023 +/- 0.004 < 0.011 15-Jun-20 23-Jun-20 334 0.027 +/- 0.004 < 0.010 23-Jun-20 29-Jun-20 244 0.022 +/- 0.005 < 0.007 29-Jun-20 06-Jul-20 294 0.028 +/- 0.004 < 0.007 06-Jul-20 14-Jul-20 342 0.029 +/- 0.004 < 0.010 14-Jul-20 20-Jul-20 254 0.020 +/- 0.005 < 0.005 20-Jul-20 28-Jul-20 327 0.018 +/- 0.004 < 0.012 28-Jul-20 03-Aug-20 255 0.019 +/- 0.005 < 0.022 03-Aug-20 10-Aug-20 293 0.030 +/- 0.005 < 0.007 10-Aug-20 17-Aug-20 320 0.022 +/- 0.004 < 0.007 17-Aug-20 24-Aug-20 294 0.027 +/- 0.005 < 0.007 24-Aug-20 31-Aug-20 296 0.035 +/- 0.005 < 0.015 31-Aug-20 08-Sep-20 347 0.024 +/- 0.004 < 0.010 08-Sep-20 14-Sep-20 263 0.014 +/- 0.004 < 0.018 14-Sep-20 21-Sep-20 295 0.040 +/- 0.005 < 0.006 21-Sep-20 28-Sep-20 301 0.023 +/- 0.004 < 0.005 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 1

Air Particulate Filters and Radioiodine Canisters Location: 002 Collection Collection Volume Gross Beta I-131 Duplicate StartDate EndDate m3 Concentration Concentration Analysis (pCi/m3) (pCi/m3) 28-Sep-20 05-Oct-20 299 0.020 +/- 0.004 < 0.007 05-Oct-20 12-Oct-20 289 0.038 +/- 0.005 < 0.005 12-Oct-20 19-Oct-20 307 0.026 +/- 0.004 < 0.012 12-Oct-20 19-Oct-20 307 0.025 +/- 0.004 Duplicate 19-Oct-20 26-Oct-20 293 0.031 +/- 0.005 < 0.028 26-Oct-20 02-Nov-20 292 0.026 +/- 0.005 < 0.009 02-Nov-20 09-Nov-20 292 0.031 +/- 0.005 < 0.017 09-Nov-20 16-Nov-20 299 0.023 +/- 0.004 < 0.008 16-Nov-20 23-Nov-20 296 0.026 +/- 0.005 < 0.017 23-Nov-20 30-Nov-20 300 0.030 +/- 0.005 < 0.010 30-Nov-20 07-Dec-20 294 0.028 +/- 0.005 < 0.017 07-Dec-20 14-Dec-20 297 0.038 +/- 0.005 < 0.010 14-Dec-20 21-Dec-20 300 0.046 +/- 0.005 < 0.017 21-Dec-20 28-Dec-20 303 0.029 +/- 0.005 < 0.012 28-Dec-20 04-Jan-21 300 0.034 +/- 0.005 < 0.008 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 2

Air Particulate Filters and Radioiodine Canisters Location: 018 Collection Collection Volume Gross Beta I-131 Duplicate StartDate EndDate m3 Concentration Concentration Analysis (pCi/m3) (pCi/m3) 30-Dec-19 07-Jan-20 340 0.019 +/- 0.004 < 0.012 07-Jan-20 13-Jan-20 257 0.020 +/- 0.005 < 0.016 07-Jan-20 13-Jan-20 257 0.020 +/- 0.005 Duplicate 13-Jan-20 20-Jan-20 305 0.027 +/- 0.004 < 0.012 20-Jan-20 27-Jan-20 302 0.024 +/- 0.004 < 0.011 27-Jan-20 03-Feb-20 303 0.021 +/- 0.004 < 0.010 27-Jan-20 03-Feb-20 303 0.024 +/- 0.004 Duplicate 03-Feb-20 10-Feb-20 318 0.017 +/- 0.004 < 0.009 10-Feb-20 17-Feb-20 308 0.017 +/- 0.004 < 0.015 17-Feb-20 24-Feb-20 320 0.020 +/- 0.004 < 0.012 24-Feb-20 02-Mar-20 304 0.014 +/- 0.004 < 0.010 24-Feb-20 02-Mar-20 304 0.017 +/- 0.004 Duplicate 02-Mar-20 09-Mar-20 299 0.013 +/- 0.004 < 0.010 09-Mar-20 16-Mar-20 308 0.017 +/- 0.004 < 0.016 09-Mar-20 16-Mar-20 308 0.018 +/- 0.004 Duplicate 16-Mar-20 23-Mar-20 292 0.016 +/- 0.004 < 0.016 16-Mar-20 23-Mar-20 292 0.016 +/- 0.004 Duplicate 23-Mar-20 30-Mar-20 303 0.020 +/- 0.004 < 0.011 30-Mar-20 06-Apr-20 312 0.026 +/- 0.004 < 0.017 06-Apr-20 13-Apr-20 294 0.028 +/- 0.005 < 0.015 13-Apr-20 20-Apr-20 299 0.027 +/- 0.004 < 0.009 13-Apr-20 20-Apr-20 299 0.032 +/- 0.005 Duplicate 20-Apr-20 27-Apr-20 300 0.020 +/- 0.004 < 0.011 20-Apr-20 27-Apr-20 300 0.019 +/- 0.004 Duplicate 27-Apr-20 04-May-20 299 0.024 +/- 0.004 < 0.009 04-May-20 11-May-20 310 0.012 +/- 0.004 < 0.012 11-May-20 18-May-20 303 0.020 +/- 0.004 < 0.012 18-May-20 26-May-20 330 0.015 +/- 0.004 < 0.006 26-May-20 01-Jun-20 257 0.014 +/- 0.005 < 0.007 01-Jun-20 08-Jun-20 293 0.025 +/- 0.005 < 0.010 01-Jun-20 08-Jun-20 293 0.024 +/- 0.004 Duplicate 08-Jun-20 15-Jun-20 303 0.027 +/- 0.004 < 0.011 15-Jun-20 23-Jun-20 343 0.028 +/- 0.004 < 0.010 23-Jun-20 29-Jun-20 215 0.023 +/- 0.006 < 0.008 23-Jun-20 29-Jun-20 215 0.017 +/- 0.006 Duplicate 29-Jun-20 06-Jul-20 302 0.028 +/- 0.004 < 0.007 06-Jul-20 14-Jul-20 346 0.024 +/- 0.004 < 0.010 06-Jul-20 14-Jul-20 346 0.026 +/- 0.004 Duplicate 14-Jul-20 20-Jul-20 253 0.026 +/- 0.005 < 0.005 20-Jul-20 28-Jul-20 338 0.013 +/- 0.004 < 0.011 28-Jul-20 03-Aug-20 264 0.017 +/- 0.004 < 0.023 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 3

Air Particulate Filters and Radioiodine Canisters Location: 018 Collection Collection Volume Gross Beta I-131 Duplicate StartDate EndDate m3 Concentration Concentration Analysis (pCi/m3) (pCi/m3) 03-Aug-20 10-Aug-20 299 0.029 +/- 0.005 < 0.008 03-Aug-20 10-Aug-20 299 0.028 +/- 0.004 Duplicate 10-Aug-20 17-Aug-20 295 0.023 +/- 0.004 < 0.008 17-Aug-20 24-Aug-20 299 0.025 +/- 0.005 < 0.007 24-Aug-20 31-Aug-20 299 0.036 +/- 0.005 < 0.015 31-Aug-20 08-Sep-20 353 0.024 +/- 0.004 < 0.009 08-Sep-20 14-Sep-20 264 0.018 +/- 0.005 < 0.018 14-Sep-20 21-Sep-20 298 0.043 +/- 0.005 < 0.006 14-Sep-20 21-Sep-20 298 0.041 +/- 0.005 Duplicate 21-Sep-20 28-Sep-20 307 0.025 +/- 0.004 < 0.005 28-Sep-20 05-Oct-20 301 0.020 +/- 0.004 < 0.007 28-Sep-20 05-Oct-20 301 0.023 +/- 0.004 Duplicate 05-Oct-20 12-Oct-20 290 0.037 +/- 0.005 < 0.005 12-Oct-20 19-Oct-20 310 0.027 +/- 0.004 < 0.012 19-Oct-20 26-Oct-20 301 0.031 +/- 0.005 < 0.040 26-Oct-20 02-Nov-20 296 0.030 +/- 0.005 < 0.009 02-Nov-20 09-Nov-20 299 0.039 +/- 0.005 < 0.016 09-Nov-20 16-Nov-20 296 0.022 +/- 0.004 < 0.008 16-Nov-20 23-Nov-20 299 0.029 +/- 0.005 < 0.017 23-Nov-20 30-Nov-20 300 0.032 +/- 0.005 < 0.010 23-Nov-20 30-Nov-20 300 0.027 +/- 0.005 Duplicate 30-Nov-20 07-Dec-20 303 0.035 +/- 0.005 < 0.016 07-Dec-20 14-Dec-20 298 0.039 +/- 0.005 < 0.010 14-Dec-20 21-Dec-20 301 0.048 +/- 0.005 < 0.017 21-Dec-20 28-Dec-20 299 0.032 +/- 0.005 < 0.012 28-Dec-20 04-Jan-21 300 0.039 +/- 0.005 < 0.008 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 4

Air Particulate Filters and Radioiodine Canisters Location: 032 Collection Collection Volume Gross Beta I-131 Duplicate StartDate EndDate m3 Concentration Concentration Analysis (pCi/m3) (pCi/m3) 30-Dec-19 07-Jan-20 339 0.019 +/- 0.004 < 0.012 07-Jan-20 13-Jan-20 191 0.017 +/- 0.006 < 0.021 13-Jan-20 20-Jan-20 306 0.035 +/- 0.005 < 0.012 20-Jan-20 27-Jan-20 295 0.023 +/- 0.005 < 0.011 27-Jan-20 03-Feb-20 304 0.020 +/- 0.004 < 0.010 03-Feb-20 10-Feb-20 311 0.017 +/- 0.004 < 0.009 10-Feb-20 17-Feb-20 305 0.017 +/- 0.004 < 0.015 17-Feb-20 24-Feb-20 314 0.021 +/- 0.004 < 0.012 24-Feb-20 02-Mar-20 298 0.016 +/- 0.004 < 0.010 02-Mar-20 09-Mar-20 296 0.014 +/- 0.004 < 0.010 09-Mar-20 16-Mar-20 304 0.017 +/- 0.004 < 0.016 16-Mar-20 23-Mar-20 292 0.014 +/- 0.004 < 0.016 23-Mar-20 30-Mar-20 298 0.023 +/- 0.004 < 0.011 30-Mar-20 06-Apr-20 304 0.024 +/- 0.004 < 0.018 06-Apr-20 13-Apr-20 300 0.027 +/- 0.005 < 0.015 06-Apr-20 13-Apr-20 300 0.027 +/- 0.005 Duplicate 13-Apr-20 20-Apr-20 300 0.027 +/- 0.004 < 0.009 20-Apr-20 27-Apr-20 239 0.018 +/- 0.005 < 0.014 27-Apr-20 04-May-20 307 0.022 +/- 0.004 < 0.009 04-May-20 11-May-20 305 0.016 +/- 0.004 < 0.012 11-May-20 18-May-20 297 0.021 +/- 0.004 < 0.012 18-May-20 26-May-20 339 0.009 +/- 0.004 < 0.006 26-May-20 01-Jun-20 257 0.016 +/- 0.005 < 0.007 01-Jun-20 08-Jun-20 299 0.025 +/- 0.004 < 0.010 08-Jun-20 15-Jun-20 301 0.028 +/- 0.004 < 0.011 15-Jun-20 23-Jun-20 342 0.028 +/- 0.004 < 0.010 23-Jun-20 29-Jun-20 250 0.022 +/- 0.005 < 0.007 29-Jun-20 06-Jul-20 306 0.026 +/- 0.004 < 0.007 06-Jul-20 14-Jul-20 346 0.029 +/- 0.004 < 0.010 14-Jul-20 20-Jul-20 257 0.019 +/- 0.005 < 0.005 20-Jul-20 28-Jul-20 346 0.015 +/- 0.004 < 0.011 20-Jul-20 28-Jul-20 346 0.014 +/- 0.004 Duplicate 28-Jul-20 03-Aug-20 260 0.020 +/- 0.005 < 0.022 03-Aug-20 10-Aug-20 302 0.030 +/- 0.005 < 0.008 10-Aug-20 17-Aug-20 302 0.023 +/- 0.004 < 0.007 17-Aug-20 24-Aug-20 313 0.028 +/- 0.005 < 0.007 24-Aug-20 31-Aug-20 294 0.038 +/- 0.005 < 0.015 31-Aug-20 08-Sep-20 355 0.027 +/- 0.004 < 0.009 08-Sep-20 14-Sep-20 267 0.016 +/- 0.004 < 0.017 14-Sep-20 21-Sep-20 299 0.043 +/- 0.005 < 0.006 21-Sep-20 28-Sep-20 302 0.027 +/- 0.005 < 0.005 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 5

Air Particulate Filters and Radioiodine Canisters Location: 032 Collection Collection Volume Gross Beta I-131 Duplicate StartDate EndDate m3 Concentration Concentration Analysis (pCi/m3) (pCi/m3) 28-Sep-20 05-Oct-20 302 0.022 +/- 0.004 < 0.007 05-Oct-20 12-Oct-20 294 0.041 +/- 0.005 < 0.005 12-Oct-20 19-Oct-20 310 0.027 +/- 0.004 < 0.012 19-Oct-20 26-Oct-20 302 0.030 +/- 0.005 < 0.037 26-Oct-20 02-Nov-20 302 0.031 +/- 0.005 < 0.009 02-Nov-20 09-Nov-20 297 0.033 +/- 0.005 < 0.017 09-Nov-20 16-Nov-20 303 0.025 +/- 0.004 < 0.008 16-Nov-20 23-Nov-20 306 0.027 +/- 0.005 < 0.016 23-Nov-20 30-Nov-20 295 0.031 +/- 0.005 < 0.010 30-Nov-20 07-Dec-20 294 0.036 +/- 0.005 < 0.017 07-Dec-20 14-Dec-20 299 0.045 +/- 0.005 < 0.010 14-Dec-20 21-Dec-20 300 0.049 +/- 0.005 < 0.017 21-Dec-20 28-Dec-20 302 0.032 +/- 0.005 < 0.012 28-Dec-20 04-Jan-21 305 0.037 +/- 0.005 < 0.008 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 6

Air Particulate Filters and Radioiodine Canisters Location: 037 Collection Collection Volume Gross Beta I-131 Duplicate StartDate EndDate m3 Concentration Concentration Analysis (pCi/m3) (pCi/m3) 30-Dec-19 07-Jan-20 346 0.018 +/- 0.004 < 0.012 07-Jan-20 13-Jan-20 240 0.023 +/- 0.005 < 0.017 13-Jan-20 20-Jan-20 309 0.039 +/- 0.005 < 0.012 20-Jan-20 27-Jan-20 277 0.023 +/- 0.005 < 0.012 27-Jan-20 03-Feb-20 296 0.022 +/- 0.004 < 0.010 03-Feb-20 10-Feb-20 318 0.019 +/- 0.004 < 0.009 10-Feb-20 17-Feb-20 303 0.019 +/- 0.004 < 0.015 17-Feb-20 24-Feb-20 315 0.021 +/- 0.004 < 0.012 24-Feb-20 02-Mar-20 305 0.014 +/- 0.004 < 0.010 02-Mar-20 09-Mar-20 299 0.016 +/- 0.004 < 0.010 09-Mar-20 16-Mar-20 310 0.018 +/- 0.004 < 0.016 16-Mar-20 23-Mar-20 294 0.010 +/- 0.004 < 0.016 23-Mar-20 30-Mar-20 299 0.023 +/- 0.004 < 0.011 30-Mar-20 06-Apr-20 305 0.024 +/- 0.004 < 0.018 06-Apr-20 13-Apr-20 300 0.026 +/- 0.005 < 0.015 13-Apr-20 20-Apr-20 305 0.031 +/- 0.005 < 0.009 20-Apr-20 27-Apr-20 302 0.027 +/- 0.005 < 0.011 27-Apr-20 04-May-20 298 0.018 +/- 0.004 < 0.009 04-May-20 11-May-20 309 0.013 +/- 0.004 < 0.012 11-May-20 18-May-20 298 0.018 +/- 0.004 < 0.012 18-May-20 26-May-20 342 0.014 +/- 0.004 < 0.005 26-May-20 01-Jun-20 256 0.013 +/- 0.005 < 0.007 01-Jun-20 08-Jun-20 211 0.021 +/- 0.006 < 0.014 08-Jun-20 15-Jun-20 306 0.021 +/- 0.004 < 0.010 15-Jun-20 23-Jun-20 347 0.029 +/- 0.004 < 0.009 23-Jun-20 29-Jun-20 244 0.024 +/- 0.005 < 0.007 29-Jun-20 06-Jul-20 303 0.027 +/- 0.004 < 0.007 06-Jul-20 14-Jul-20 348 0.024 +/- 0.004 < 0.010 14-Jul-20 20-Jul-20 261 0.024 +/- 0.005 < 0.005 20-Jul-20 28-Jul-20 343 0.014 +/- 0.004 < 0.011 28-Jul-20 03-Aug-20 261 0.022 +/- 0.005 < 0.022 03-Aug-20 10-Aug-20 301 0.032 +/- 0.005 < 0.008 10-Aug-20 17-Aug-20 302 0.025 +/- 0.004 < 0.007 17-Aug-20 24-Aug-20 301 0.029 +/- 0.005 < 0.007 17-Aug-20 24-Aug-20 301 0.025 +/- 0.005 Duplicate 24-Aug-20 31-Aug-20 302 0.033 +/- 0.005 < 0.015 31-Aug-20 08-Sep-20 347 0.025 +/- 0.004 < 0.010 08-Sep-20 14-Sep-20 268 0.014 +/- 0.004 < 0.017 14-Sep-20 21-Sep-20 302 0.044 +/- 0.005 < 0.005 21-Sep-20 28-Sep-20 304 0.024 +/- 0.004 < 0.005 28-Sep-20 05-Oct-20 307 0.020 +/- 0.004 < 0.007 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 7

Air Particulate Filters and Radioiodine Canisters Location: 037 Collection Collection Volume Gross Beta I-131 Duplicate StartDate EndDate m3 Concentration Concentration Analysis (pCi/m3) (pCi/m3) 05-Oct-20 12-Oct-20 294 0.043 +/- 0.005 < 0.005 12-Oct-20 19-Oct-20 308 0.025 +/- 0.004 < 0.012 19-Oct-20 26-Oct-20 300 0.028 +/- 0.005 < 0.028 26-Oct-20 02-Nov-20 299 0.030 +/- 0.005 < 0.009 26-Oct-20 02-Nov-20 299 0.030 +/- 0.005 Duplicate 02-Nov-20 09-Nov-20 298 0.031 +/- 0.005 < 0.016 02-Nov-20 09-Nov-20 298 0.035 +/- 0.005 Duplicate 09-Nov-20 16-Nov-20 305 0.025 +/- 0.004 < 0.008 16-Nov-20 23-Nov-20 302 0.026 +/- 0.005 < 0.016 23-Nov-20 30-Nov-20 302 0.032 +/- 0.005 < 0.010 30-Nov-20 07-Dec-20 292 0.037 +/- 0.005 < 0.017 07-Dec-20 14-Dec-20 327 0.038 +/- 0.005 < 0.009 14-Dec-20 21-Dec-20 297 0.050 +/- 0.005 < 0.018 21-Dec-20 28-Dec-20 302 0.031 +/- 0.005 < 0.012 28-Dec-20 04-Jan-21 301 0.043 +/- 0.005 < 0.008 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 8

Air Particulate Filters and Radioiodine Canisters Location: 049 Collection Collection Volume Gross Beta I-131 Duplicate StartDate EndDate m3 Concentration Concentration Analysis (pCi/m3) (pCi/m3) 30-Dec-19 07-Jan-20 344 0.020 +/- 0.004 < 0.012 07-Jan-20 13-Jan-20 258 0.023 +/- 0.005 < 0.016 13-Jan-20 20-Jan-20 306 0.035 +/- 0.005 < 0.012 20-Jan-20 27-Jan-20 299 0.025 +/- 0.005 < 0.011 27-Jan-20 03-Feb-20 302 0.020 +/- 0.004 < 0.010 03-Feb-20 10-Feb-20 304 0.017 +/- 0.004 < 0.009 10-Feb-20 17-Feb-20 304 0.015 +/- 0.004 < 0.015 17-Feb-20 24-Feb-20 317 0.021 +/- 0.004 < 0.012 24-Feb-20 02-Mar-20 303 0.019 +/- 0.004 < 0.010 02-Mar-20 09-Mar-20 304 0.012 +/- 0.004 < 0.010 02-Mar-20 09-Mar-20 304 0.013 +/- 0.004 Duplicate 09-Mar-20 16-Mar-20 313 0.015 +/- 0.004 < 0.015 16-Mar-20 23-Mar-20 300 0.014 +/- 0.004 < 0.016 23-Mar-20 30-Mar-20 270 0.022 +/- 0.005 < 0.012 30-Mar-20 06-Apr-20 304 0.020 +/- 0.004 < 0.018 06-Apr-20 13-Apr-20 305 0.027 +/- 0.005 < 0.014 13-Apr-20 20-Apr-20 294 0.030 +/- 0.005 < 0.009 20-Apr-20 27-Apr-20 303 0.020 +/- 0.004 < 0.011 27-Apr-20 04-May-20 299 0.022 +/- 0.004 < 0.009 04-May-20 11-May-20 310 0.012 +/- 0.004 < 0.012 11-May-20 18-May-20 302 0.014 +/- 0.004 < 0.012 18-May-20 26-May-20 340 0.012 +/- 0.004 < 0.006 26-May-20 01-Jun-20 257 0.015 +/- 0.005 < 0.007 01-Jun-20 08-Jun-20 297 0.027 +/- 0.005 < 0.010 08-Jun-20 15-Jun-20 307 0.022 +/- 0.004 < 0.010 15-Jun-20 23-Jun-20 335 0.024 +/- 0.004 < 0.010 23-Jun-20 29-Jun-20 257 0.020 +/- 0.005 < 0.007 29-Jun-20 06-Jul-20 296 0.024 +/- 0.004 < 0.007 06-Jul-20 14-Jul-20 353 0.028 +/- 0.004 < 0.010 14-Jul-20 20-Jul-20 259 0.026 +/- 0.005 < 0.005 14-Jul-20 20-Jul-20 259 0.020 +/- 0.005 Duplicate 20-Jul-20 28-Jul-20 340 0.015 +/- 0.004 < 0.011 28-Jul-20 03-Aug-20 258 0.022 +/- 0.005 < 0.022 03-Aug-20 10-Aug-20 299 0.030 +/- 0.005 < 0.008 10-Aug-20 17-Aug-20 301 0.024 +/- 0.004 < 0.007 17-Aug-20 24-Aug-20 278 0.024 +/- 0.005 < 0.008 24-Aug-20 31-Aug-20 290 0.036 +/- 0.005 < 0.016 31-Aug-20 08-Sep-20 347 0.022 +/- 0.004 < 0.010 08-Sep-20 14-Sep-20 264 0.019 +/- 0.005 < 0.018 14-Sep-20 21-Sep-20 299 0.037 +/- 0.005 < 0.006 21-Sep-20 28-Sep-20 291 0.024 +/- 0.005 < 0.006 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 9

Air Particulate Filters and Radioiodine Canisters Location: 049 Collection Collection Volume Gross Beta I-131 Duplicate StartDate EndDate m3 Concentration Concentration Analysis (pCi/m3) (pCi/m3) 28-Sep-20 05-Oct-20 310 0.019 +/- 0.004 < 0.007 05-Oct-20 12-Oct-20 298 0.036 +/- 0.005 < 0.005 12-Oct-20 19-Oct-20 305 0.023 +/- 0.004 < 0.012 19-Oct-20 26-Oct-20 297 0.029 +/- 0.005 < 0.033 26-Oct-20 02-Nov-20 301 0.027 +/- 0.005 < 0.009 02-Nov-20 09-Nov-20 292 0.031 +/- 0.005 < 0.017 09-Nov-20 16-Nov-20 301 0.020 +/- 0.004 < 0.008 16-Nov-20 23-Nov-20 296 0.030 +/- 0.005 < 0.017 23-Nov-20 30-Nov-20 300 0.029 +/- 0.005 < 0.010 30-Nov-20 07-Dec-20 298 0.033 +/- 0.005 < 0.017 07-Dec-20 14-Dec-20 306 0.044 +/- 0.005 < 0.009 14-Dec-20 21-Dec-20 310 0.048 +/- 0.005 < 0.017 14-Dec-20 21-Dec-20 310 0.048 +/- 0.005 Duplicate 21-Dec-20 28-Dec-20 308 0.032 +/- 0.005 < 0.012 28-Dec-20 04-Jan-21 293 0.043 +/- 0.005 < 0.008 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 10

Air Particulate Filters and Radioiodine Canisters Location: 053 Collection Collection Volume Gross Beta I-131 Duplicate StartDate EndDate m3 Concentration Concentration Analysis (pCi/m3) (pCi/m3) 30-Dec-19 07-Jan-20 341 0.019 +/- 0.004 < 0.012 07-Jan-20 13-Jan-20 256 0.020 +/- 0.005 < 0.016 13-Jan-20 20-Jan-20 312 0.033 +/- 0.005 < 0.012 20-Jan-20 27-Jan-20 294 0.024 +/- 0.005 < 0.011 27-Jan-20 03-Feb-20 302 0.022 +/- 0.004 < 0.010 03-Feb-20 10-Feb-20 314 0.019 +/- 0.004 < 0.009 10-Feb-20 17-Feb-20 305 0.018 +/- 0.004 < 0.015 17-Feb-20 24-Feb-20 319 0.021 +/- 0.004 < 0.012 24-Feb-20 02-Mar-20 301 0.015 +/- 0.004 < 0.010 02-Mar-20 09-Mar-20 299 0.010 +/- 0.004 < 0.010 09-Mar-20 16-Mar-20 301 0.016 +/- 0.004 < 0.016 16-Mar-20 23-Mar-20 291 0.016 +/- 0.004 < 0.017 23-Mar-20 30-Mar-20 295 0.021 +/- 0.004 < 0.011 30-Mar-20 06-Apr-20 306 0.020 +/- 0.004 < 0.018 06-Apr-20 13-Apr-20 303 0.025 +/- 0.004 < 0.014 13-Apr-20 20-Apr-20 301 0.029 +/- 0.005 < 0.009 20-Apr-20 27-Apr-20 302 0.020 +/- 0.004 < 0.011 27-Apr-20 04-May-20 297 0.018 +/- 0.004 < 0.010 04-May-20 11-May-20 304 0.013 +/- 0.004 < 0.012 11-May-20 18-May-20 302 0.019 +/- 0.004 < 0.012 18-May-20 26-May-20 329 0.010 +/- 0.004 < 0.006 26-May-20 01-Jun-20 251 0.012 +/- 0.005 < 0.008 01-Jun-20 08-Jun-20 273 0.023 +/- 0.005 < 0.010 08-Jun-20 15-Jun-20 290 0.020 +/- 0.004 < 0.011 08-Jun-20 15-Jun-20 290 0.022 +/- 0.004 Duplicate 15-Jun-20 23-Jun-20 339 0.024 +/- 0.004 < 0.010 23-Jun-20 29-Jun-20 245 0.022 +/- 0.005 < 0.007 29-Jun-20 06-Jul-20 298 0.026 +/- 0.004 < 0.007 06-Jul-20 14-Jul-20 349 0.026 +/- 0.004 < 0.010 14-Jul-20 20-Jul-20 256 0.024 +/- 0.005 < 0.005 20-Jul-20 28-Jul-20 332 0.016 +/- 0.004 < 0.012 28-Jul-20 03-Aug-20 263 0.023 +/- 0.005 < 0.023 03-Aug-20 10-Aug-20 291 0.028 +/- 0.005 < 0.008 10-Aug-20 17-Aug-20 301 0.025 +/- 0.004 < 0.007 17-Aug-20 24-Aug-20 299 0.027 +/- 0.005 < 0.007 24-Aug-20 31-Aug-20 305 0.030 +/- 0.005 < 0.015 31-Aug-20 08-Sep-20 345 0.023 +/- 0.004 < 0.010 08-Sep-20 14-Sep-20 267 0.012 +/- 0.004 < 0.017 14-Sep-20 21-Sep-20 298 0.037 +/- 0.005 < 0.006 21-Sep-20 28-Sep-20 310 0.021 +/- 0.004 < 0.005 21-Sep-20 28-Sep-20 310 0.023 +/- 0.004 Duplicate 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 11

Air Particulate Filters and Radioiodine Canisters Location: 053 Collection Collection Volume Gross Beta I-131 Duplicate StartDate EndDate m3 Concentration Concentration Analysis (pCi/m3) (pCi/m3) 28-Sep-20 05-Oct-20 305 0.020 +/- 0.004 < 0.007 05-Oct-20 12-Oct-20 298 0.036 +/- 0.005 < 0.005 12-Oct-20 19-Oct-20 309 0.028 +/- 0.004 < 0.012 19-Oct-20 26-Oct-20 301 0.026 +/- 0.005 < 0.046 26-Oct-20 02-Nov-20 299 0.028 +/- 0.005 < 0.009 02-Nov-20 09-Nov-20 297 0.032 +/- 0.005 < 0.017 09-Nov-20 16-Nov-20 303 0.021 +/- 0.004 < 0.008 16-Nov-20 23-Nov-20 303 0.025 +/- 0.004 < 0.016 23-Nov-20 30-Nov-20 301 0.024 +/- 0.005 < 0.010 30-Nov-20 07-Dec-20 287 0.035 +/- 0.005 < 0.017 07-Dec-20 14-Dec-20 298 0.042 +/- 0.005 < 0.010 14-Dec-20 21-Dec-20 299 0.045 +/- 0.005 < 0.017 21-Dec-20 28-Dec-20 301 0.028 +/- 0.005 < 0.012 21-Dec-20 28-Dec-20 301 0.029 +/- 0.005 Duplicate 28-Dec-20 04-Jan-21 305 0.036 +/- 0.005 < 0.008 28-Dec-20 04-Jan-21 305 0.035 +/- 0.005 Duplicate 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 12

Quarterly Air Particulates - Gamma Location: 002 30-Mar-20 Nuclide Concentration (pCi/m3)

BE-7 0.066 +/- 0.012 BE-7 0.078 +/- 0.019

• MN-54 < 0.001

• MN-54 < 0.001 CO-58 < 0.001

• CO-58 < 0.001 FE-59 < 0.001 FE-59 < 0.002

• CO-60 < 0.001

• CO-60 < 0.001 ZN-65 < 0.001 ZN-65 < 0.002

• ZR-NB-95 < 0.001

• ZR-NB-95 < 0.001 CS-134 < 0.001

• CS-134 < 0.001 CS-137 < 0.001

• CS-137 < 0.001 29-Jun-20 Nuclide Concentration (pCi/m3)

BE-7 0.103 +/- 0.018 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.002 CO-60 < 0.001 ZN-65 < 0.001 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001 28-Sep-20 Nuclide Concentration (pCi/m3)

BE-7 0.089 +/- 0.022 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.003 CO-60 < 0.001 ZN-65 < 0.002 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001 28-Dec-20 Nuclide Concentration (pCi/m3)

BE-7 0.064 +/- 0.015

• Duplicate Analysis 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 13

Quarterly Air Particulates - Gamma Location: 002 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.001 CO-60 < 0.001 ZN-65 < 0.001 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001

• Duplicate Analysis 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 14

Quarterly Air Particulates - Gamma Location: 018 30-Mar-20 Nuclide Concentration (pCi/m3)

BE-7 0.077 +/- 0.019 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.002 CO-60 < 0.001 ZN-65 < 0.001 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001 29-Jun-20 Nuclide Concentration (pCi/m3)

BE-7 0.110 +/- 0.018 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.003 CO-60 < 0.001 ZN-65 < 0.002 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001 28-Sep-20 Nuclide Concentration (pCi/m3)

BE-7 0.107 +/- 0.021 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.002 CO-60 < 0.001 ZN-65 < 0.001 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001 28-Dec-20 Nuclide Concentration (pCi/m3)

BE-7 0.082 +/- 0.014 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.001 CO-60 < 0.001 ZN-65 < 0.002 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001

• Duplicate Analysis 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 15

Quarterly Air Particulates - Gamma Location: 032 30-Mar-20 Nuclide Concentration (pCi/m3)

BE-7 0.078 +/- 0.018 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.002 CO-60 < 0.001 ZN-65 < 0.002 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001 29-Jun-20 Nuclide Concentration (pCi/m3)

BE-7 0.097 +/- 0.016 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.002 CO-60 < 0.001 ZN-65 < 0.002 ZR-NB-95 < 0.002 CS-134 < 0.001 CS-137 < 0.001 28-Sep-20 Nuclide Concentration (pCi/m3)

BE-7 0.099 +/- 0.022 BE-7 0.110 +/- 0.025

• MN-54 < 0.001

• MN-54 < 0.001 CO-58 < 0.001

• CO-58 < 0.001 FE-59 < 0.002

• FE-59 < 0.002 CO-60 < 0.001

• CO-60 < 0.001 ZN-65 < 0.001

• ZN-65 < 0.001 ZR-NB-95 < 0.001

• ZR-NB-95 < 0.002 CS-134 < 0.001

• CS-134 < 0.001 CS-137 < 0.001

• CS-137 < 0.001 28-Dec-20 Nuclide Concentration (pCi/m3)

BE-7 0.083 +/- 0.016

• Duplicate Analysis 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 16

Quarterly Air Particulates - Gamma Location: 032 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.002 CO-60 < 0.001 ZN-65 < 0.003 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001

• Duplicate Analysis 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 17

Quarterly Air Particulates - Gamma Location: 037 30-Mar-20 Nuclide Concentration (pCi/m3)

BE-7 0.072 +/- 0.015 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.002 CO-60 < 0.001 ZN-65 < 0.001 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001 29-Jun-20 Nuclide Concentration (pCi/m3)

BE-7 0.112 +/- 0.017 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.002 CO-60 < 0.001 ZN-65 < 0.002 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001 28-Sep-20 Nuclide Concentration (pCi/m3)

BE-7 0.093 +/- 0.024 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.003 CO-60 < 0.001 ZN-65 < 0.004 ZR-NB-95 < 0.002 CS-134 < 0.001 CS-137 < 0.001 28-Dec-20 Nuclide Concentration (pCi/m3)

BE-7 0.082 +/- 0.015 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.001 CO-60 < 0.001 ZN-65 < 0.002 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001

• Duplicate Analysis 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 18

Quarterly Air Particulates - Gamma Location: 049 30-Mar-20 Nuclide Concentration (pCi/m3)

BE-7 0.069 +/- 0.014 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.002 CO-60 < 0.001 ZN-65 < 0.001 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001 29-Jun-20 Nuclide Concentration (pCi/m3)

BE-7 0.110 +/- 0.017 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.002 CO-60 < 0.001 ZN-65 < 0.001 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001 28-Sep-20 Nuclide Concentration (pCi/m3)

BE-7 0.115 +/- 0.019 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.003 CO-60 < 0.001 ZN-65 < 0.001 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001 28-Dec-20 Nuclide Concentration (pCi/m3)

BE-7 0.079 +/- 0.015 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.002 CO-60 < 0.001 ZN-65 < 0.002 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001

• Duplicate Analysis 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 19

Quarterly Air Particulates - Gamma Location: 053 30-Mar-20 Nuclide Concentration (pCi/m3)

BE-7 0.068 +/- 0.014 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.002 CO-60 < 0.001 ZN-65 < 0.001 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001 29-Jun-20 Nuclide Concentration (pCi/m3)

BE-7 0.097 +/- 0.021 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.002 CO-60 < 0.001 ZN-65 < 0.003 ZR-NB-95 < 0.002 CS-134 < 0.001 CS-137 < 0.001 28-Sep-20 Nuclide Concentration (pCi/m3)

BE-7 0.100 +/- 0.021 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.003 CO-60 < 0.001 ZN-65 < 0.002 ZR-NB-95 < 0.001 CS-134 < 0.001 CS-137 < 0.001 28-Dec-20 Nuclide Concentration (pCi/m3)

BE-7 0.056 +/- 0.015 MN-54 < 0.001 CO-58 < 0.001 FE-59 < 0.004 CO-60 < 0.002 ZN-65 < 0.004 ZR-NB-95 < 0.003 CS-134 < 0.001 CS-137 < 0.001

• Duplicate Analysis 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 20

Exposure Pathway - Waterborne Surface Water Location: JRR Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 13-Jan-20 SURFACE WATER MN-54 < 4.1 13-Jan-20 SURFACE WATER CO-58 < 3.2 13-Jan-20 SURFACE WATER FE-59 < 7.1 13-Jan-20 SURFACE WATER CO-60 < 2.7 13-Jan-20 SURFACE WATER ZN-65 < 4.7 13-Jan-20 SURFACE WATER ZR-NB-95 < 3.8 13-Jan-20 SURFACE WATER I-131 < 6.3 13-Jan-20 SURFACE WATER CS-134 < 5.1 13-Jan-20 SURFACE WATER CS-137 < 5.6 13-Jan-20 SURFACE WATER BA-LA-140 < 2.3 13-Jan-20 SURFACE WATER H-3 < 158.0 10-Feb-20 SURFACE WATER MN-54 < 6.9 10-Feb-20 SURFACE WATER CO-58 < 6.7 10-Feb-20 SURFACE WATER FE-59 < 12.2 10-Feb-20 SURFACE WATER CO-60 < 2.6 10-Feb-20 SURFACE WATER ZN-65 < 17.6 10-Feb-20 SURFACE WATER ZR-NB-95 < 8.6 10-Feb-20 SURFACE WATER I-131 < 4.5 10-Feb-20 SURFACE WATER CS-134 < 5.6 10-Feb-20 SURFACE WATER CS-137 < 5.4 10-Feb-20 SURFACE WATER BA-LA-140 < 9.0 10-Feb-20 SURFACE WATER H-3 < 154.0 10-Feb-20 SURFACE WATER FE-55 < 166.0 09-Mar-20 SURFACE WATER MN-54 < 2.5 09-Mar-20 SURFACE WATER CO-58 < 2.5 09-Mar-20 SURFACE WATER FE-59 < 6.5 09-Mar-20 SURFACE WATER CO-60 < 2.7 09-Mar-20 SURFACE WATER ZN-65 < 4.6 09-Mar-20 SURFACE WATER ZR-NB-95 < 2.8 09-Mar-20 SURFACE WATER I-131 < 2.7 09-Mar-20 SURFACE WATER CS-134 < 3.3 09-Mar-20 SURFACE WATER CS-137 < 3.4 09-Mar-20 SURFACE WATER BA-LA-140 < 2.1 09-Mar-20 SURFACE WATER H-3 < 151.0 06-Apr-20 SURFACE WATER MN-54 < 1.5 06-Apr-20 SURFACE WATER CO-58 < 1.7 06-Apr-20 SURFACE WATER FE-59 < 3.0 06-Apr-20 SURFACE WATER CO-60 < 1.4 2020 Annual Radiological Environmental Operating Report Page C - 21 Wolf Creek Generating Station

Exposure Pathway - Waterborne Surface Water Location: JRR Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 06-Apr-20 SURFACE WATER ZN-65 < 2.2 06-Apr-20 SURFACE WATER ZR-NB-95 < 1.5 06-Apr-20 SURFACE WATER I-131 < 2.9 06-Apr-20 SURFACE WATER CS-134 < 2.2 06-Apr-20 SURFACE WATER CS-137 < 2.1 06-Apr-20 SURFACE WATER BA-LA-140 < 1.0 06-Apr-20 SURFACE WATER H-3 < 157.0 11-May-20 SURFACE WATER MN-54 < 2.6 11-May-20 SURFACE WATER CO-58 < 1.8 11-May-20 SURFACE WATER FE-59 < 1.8 11-May-20 SURFACE WATER CO-60 < 1.7 11-May-20 SURFACE WATER ZN-65 < 4.2 11-May-20 SURFACE WATER ZR-NB-95 < 1.8 11-May-20 SURFACE WATER I-131 < 1.9 11-May-20 SURFACE WATER CS-134 < 1.8 11-May-20 SURFACE WATER CS-137 < 1.8 11-May-20 SURFACE WATER BA-LA-140 < 1.1 11-May-20 SURFACE WATER H-3 < 153.0 11-May-20 SURFACE WATER FE-55 < 123.0 08-Jun-20 SURFACE WATER MN-54 < 3.1 08-Jun-20 SURFACE WATER CO-58 < 3.3 08-Jun-20 SURFACE WATER FE-59 < 8.1 08-Jun-20 SURFACE WATER CO-60 < 3.7 08-Jun-20 SURFACE WATER ZN-65 < 7.4 08-Jun-20 SURFACE WATER ZR-NB-95 < 3.4 08-Jun-20 SURFACE WATER I-131 < 6.0 08-Jun-20 SURFACE WATER CS-134 < 4.2 08-Jun-20 SURFACE WATER CS-137 < 3.2 08-Jun-20 SURFACE WATER BA-LA-140 < 6.0 08-Jun-20 SURFACE WATER H-3 < 156.0 07-Jul-20 SURFACE WATER MN-54 < 2.3 07-Jul-20 SURFACE WATER CO-58 < 2.0 07-Jul-20 SURFACE WATER FE-59 < 3.9 07-Jul-20 SURFACE WATER CO-60 < 2.3 07-Jul-20 SURFACE WATER ZN-65 < 5.7 07-Jul-20 SURFACE WATER ZR-NB-95 < 4.0 07-Jul-20 SURFACE WATER I-131 < 6.3 07-Jul-20 SURFACE WATER CS-134 < 3.5 2020 Annual Radiological Environmental Operating Report Page C - 22 Wolf Creek Generating Station

Exposure Pathway - Waterborne Surface Water Location: JRR Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 07-Jul-20 SURFACE WATER CS-137 < 2.9 07-Jul-20 SURFACE WATER BA-LA-140 < 3.2 07-Jul-20 SURFACE WATER H-3 < 160.0 10-Aug-20 SURFACE WATER MN-54 < 3.9 10-Aug-20 SURFACE WATER CO-58 < 2.7 10-Aug-20 SURFACE WATER FE-59 < 3.9 10-Aug-20 SURFACE WATER CO-60 < 3.5 10-Aug-20 SURFACE WATER ZN-65 < 6.4 10-Aug-20 SURFACE WATER ZR-NB-95 < 3.6 10-Aug-20 SURFACE WATER I-131 < 4.5 10-Aug-20 SURFACE WATER CS-134 < 4.3 10-Aug-20 SURFACE WATER CS-137 < 3.3 10-Aug-20 SURFACE WATER BA-LA-140 < 4.8 10-Aug-20 SURFACE WATER H-3 < 158.0 10-Aug-20 SURFACE WATER FE-55 < 140.0 14-Sep-20 SURFACE WATER MN-54 < 1.9 Duplicate 14-Sep-20 SURFACE WATER MN-54 < 2.9 14-Sep-20 SURFACE WATER CO-58 < 3.0 Duplicate 14-Sep-20 SURFACE WATER CO-58 < 2.6 14-Sep-20 SURFACE WATER FE-59 < 5.5 Duplicate 14-Sep-20 SURFACE WATER FE-59 < 4.5 14-Sep-20 SURFACE WATER CO-60 < 1.8 Duplicate 14-Sep-20 SURFACE WATER CO-60 < 4.0 14-Sep-20 SURFACE WATER ZN-65 < 4.6 Duplicate 14-Sep-20 SURFACE WATER ZN-65 < 2.9 14-Sep-20 SURFACE WATER ZR-NB-95 < 2.2 Duplicate 14-Sep-20 SURFACE WATER ZR-NB-95 < 5.6 14-Sep-20 SURFACE WATER I-131 < 4.9 Duplicate 14-Sep-20 SURFACE WATER I-131 < 9.9 14-Sep-20 SURFACE WATER CS-134 < 3.2 Duplicate 14-Sep-20 SURFACE WATER CS-134 < 4.5 14-Sep-20 SURFACE WATER CS-137 < 2.2 Duplicate 14-Sep-20 SURFACE WATER CS-137 < 3.6 14-Sep-20 SURFACE WATER BA-LA-140 < 3.5 Duplicate 14-Sep-20 SURFACE WATER BA-LA-140 < 4.6 14-Sep-20 SURFACE WATER H-3 < 159.0 Duplicate 14-Sep-20 SURFACE WATER H-3 < 159.0 12-Oct-20 SURFACE WATER MN-54 < 2.1 2020 Annual Radiological Environmental Operating Report Page C - 23 Wolf Creek Generating Station

Exposure Pathway - Waterborne Surface Water Location: JRR Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 12-Oct-20 SURFACE WATER CO-58 < 4.3 12-Oct-20 SURFACE WATER FE-59 < 6.0 12-Oct-20 SURFACE WATER CO-60 < 3.3 12-Oct-20 SURFACE WATER ZN-65 < 7.7 12-Oct-20 SURFACE WATER ZR-NB-95 < 2.3 12-Oct-20 SURFACE WATER I-131 < 7.4 12-Oct-20 SURFACE WATER CS-134 < 4.7 12-Oct-20 SURFACE WATER CS-137 < 3.6 12-Oct-20 SURFACE WATER BA-LA-140 < 2.4 12-Oct-20 SURFACE WATER H-3 < 157.0 16-Nov-20 SURFACE WATER MN-54 < 3.3 16-Nov-20 SURFACE WATER CO-58 < 4.7 16-Nov-20 SURFACE WATER FE-59 < 8.1 16-Nov-20 SURFACE WATER CO-60 < 2.6 16-Nov-20 SURFACE WATER ZN-65 < 4.3 16-Nov-20 SURFACE WATER ZR-NB-95 < 6.1 16-Nov-20 SURFACE WATER I-131 < 9.6 16-Nov-20 SURFACE WATER CS-134 < 5.2 16-Nov-20 SURFACE WATER CS-137 < 3.2 16-Nov-20 SURFACE WATER BA-LA-140 < 3.1 16-Nov-20 SURFACE WATER H-3 < 157.0 16-Nov-20 SURFACE WATER FE-55 < 160.0 07-Dec-20 SURFACE WATER MN-54 < 3.0 07-Dec-20 SURFACE WATER CO-58 < 2.7 07-Dec-20 SURFACE WATER FE-59 < 4.7 07-Dec-20 SURFACE WATER CO-60 < 3.5 07-Dec-20 SURFACE WATER ZN-65 < 11.4 07-Dec-20 SURFACE WATER ZR-NB-95 < 6.0 07-Dec-20 SURFACE WATER I-131 < 14.5 07-Dec-20 SURFACE WATER CS-134 < 5.2 07-Dec-20 SURFACE WATER CS-137 < 3.2 07-Dec-20 SURFACE WATER BA-LA-140 < 8.8 07-Dec-20 SURFACE WATER H-3 < 160.0 2020 Annual Radiological Environmental Operating Report Page C - 24 Wolf Creek Generating Station

Exposure Pathway - Waterborne Surface Water Location: SP Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 13-Jan-20 SURFACE WATER MN-54 < 2.3 13-Jan-20 SURFACE WATER CO-58 < 1.9 13-Jan-20 SURFACE WATER FE-59 < 3.2 13-Jan-20 SURFACE WATER CO-60 < 2.4 13-Jan-20 SURFACE WATER ZN-65 < 6.1 13-Jan-20 SURFACE WATER ZR-NB-95 < 2.7 13-Jan-20 SURFACE WATER I-131 < 3.8 13-Jan-20 SURFACE WATER CS-134 < 2.8 13-Jan-20 SURFACE WATER CS-137 < 2.2 13-Jan-20 SURFACE WATER BA-LA-140 < 2.7 13-Jan-20 SURFACE WATER H-3 10,821 +/- 318.0 10-Feb-20 SURFACE WATER MN-54 < 1.7 10-Feb-20 SURFACE WATER CO-58 < 2.7 10-Feb-20 SURFACE WATER FE-59 < 3.2 10-Feb-20 SURFACE WATER CO-60 < 1.7 10-Feb-20 SURFACE WATER ZN-65 < 2.5 10-Feb-20 SURFACE WATER ZR-NB-95 < 1.7 10-Feb-20 SURFACE WATER I-131 < 2.1 10-Feb-20 SURFACE WATER CS-134 < 2.4 10-Feb-20 SURFACE WATER CS-137 < 1.6 10-Feb-20 SURFACE WATER BA-LA-140 < 2.2 10-Feb-20 SURFACE WATER H-3 10,618 +/- 315.0 10-Feb-20 SURFACE WATER FE-55 < 488.0 09-Mar-20 SURFACE WATER MN-54 < 2.5 09-Mar-20 SURFACE WATER CO-58 < 2.2 09-Mar-20 SURFACE WATER FE-59 < 5.6 09-Mar-20 SURFACE WATER CO-60 < 1.8 09-Mar-20 SURFACE WATER ZN-65 < 4.3 09-Mar-20 SURFACE WATER ZR-NB-95 < 2.6 09-Mar-20 SURFACE WATER I-131 < 4.2 09-Mar-20 SURFACE WATER CS-134 < 3.7 09-Mar-20 SURFACE WATER CS-137 < 2.7 09-Mar-20 SURFACE WATER BA-LA-140 < 1.4 09-Mar-20 SURFACE WATER H-3 10,714 +/- 316.0 06-Apr-20 SURFACE WATER MN-54 < 2.3 06-Apr-20 SURFACE WATER CO-58 < 2.7 06-Apr-20 SURFACE WATER FE-59 < 4.4 06-Apr-20 SURFACE WATER CO-60 < 3.2 2020 Annual Radiological Environmental Operating Report Page C - 25 Wolf Creek Generating Station

Exposure Pathway - Waterborne Surface Water Location: SP Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 06-Apr-20 SURFACE WATER ZN-65 < 4.2 06-Apr-20 SURFACE WATER ZR-NB-95 < 1.5 06-Apr-20 SURFACE WATER I-131 < 2.0 06-Apr-20 SURFACE WATER CS-134 < 4.3 06-Apr-20 SURFACE WATER CS-137 < 3.7 06-Apr-20 SURFACE WATER BA-LA-140 < 1.8 06-Apr-20 SURFACE WATER H-3 10,682 +/- 316.0 11-May-20 SURFACE WATER MN-54 < 3.6 11-May-20 SURFACE WATER CO-58 < 3.0 11-May-20 SURFACE WATER FE-59 < 4.4 11-May-20 SURFACE WATER CO-60 < 1.8 11-May-20 SURFACE WATER ZN-65 < 3.4 11-May-20 SURFACE WATER ZR-NB-95 < 3.6 11-May-20 SURFACE WATER I-131 < 4.6 11-May-20 SURFACE WATER CS-134 < 3.8 11-May-20 SURFACE WATER CS-137 < 2.5 11-May-20 SURFACE WATER BA-LA-140 < 3.3 11-May-20 SURFACE WATER H-3 10,020 +/- 306.0 11-May-20 SURFACE WATER FE-55 < 130.0 08-Jun-20 SURFACE WATER MN-54 < 3.5 08-Jun-20 SURFACE WATER CO-58 < 5.1 08-Jun-20 SURFACE WATER FE-59 < 7.2 08-Jun-20 SURFACE WATER CO-60 < 2.8 08-Jun-20 SURFACE WATER ZN-65 < 7.9 08-Jun-20 SURFACE WATER ZR-NB-95 < 3.4 08-Jun-20 SURFACE WATER I-131 < 7.4 08-Jun-20 SURFACE WATER CS-134 < 4.3 08-Jun-20 SURFACE WATER CS-137 < 4.0 08-Jun-20 SURFACE WATER BA-LA-140 < 5.1 08-Jun-20 SURFACE WATER H-3 9,461 +/- 301.0 07-Jul-20 SURFACE WATER MN-54 < 2.6 07-Jul-20 SURFACE WATER CO-58 < 3.7 07-Jul-20 SURFACE WATER FE-59 < 7.5 07-Jul-20 SURFACE WATER CO-60 < 3.6 07-Jul-20 SURFACE WATER ZN-65 < 3.6 07-Jul-20 SURFACE WATER ZR-NB-95 < 3.1 07-Jul-20 SURFACE WATER I-131 < 6.6 07-Jul-20 SURFACE WATER CS-134 < 4.9 2020 Annual Radiological Environmental Operating Report Page C - 26 Wolf Creek Generating Station

Exposure Pathway - Waterborne Surface Water Location: SP Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 07-Jul-20 SURFACE WATER CS-137 < 2.1 07-Jul-20 SURFACE WATER BA-LA-140 < 4.2 07-Jul-20 SURFACE WATER H-3 8,972 +/- 293.0 10-Aug-20 SURFACE WATER MN-54 < 2.6 10-Aug-20 SURFACE WATER CO-58 < 2.8 10-Aug-20 SURFACE WATER FE-59 < 5.1 10-Aug-20 SURFACE WATER CO-60 < 2.4 10-Aug-20 SURFACE WATER ZN-65 < 4.2 10-Aug-20 SURFACE WATER ZR-NB-95 < 3.2 10-Aug-20 SURFACE WATER I-131 < 5.2 10-Aug-20 SURFACE WATER CS-134 < 4.6 10-Aug-20 SURFACE WATER CS-137 < 3.2 10-Aug-20 SURFACE WATER BA-LA-140 < 6.2 10-Aug-20 SURFACE WATER H-3 9,554 +/- 304.0 10-Aug-20 SURFACE WATER FE-55 < 133.0 14-Sep-20 SURFACE WATER MN-54 < 4.3 14-Sep-20 SURFACE WATER CO-58 < 3.8 14-Sep-20 SURFACE WATER FE-59 < 5.6 14-Sep-20 SURFACE WATER CO-60 < 3.9 14-Sep-20 SURFACE WATER ZN-65 < 4.8 14-Sep-20 SURFACE WATER ZR-NB-95 < 5.1 14-Sep-20 SURFACE WATER I-131 < 9.1 14-Sep-20 SURFACE WATER CS-134 < 5.4 14-Sep-20 SURFACE WATER CS-137 < 5.5 14-Sep-20 SURFACE WATER BA-LA-140 < 3.4 14-Sep-20 SURFACE WATER H-3 11,437 +/- 329.0 12-Oct-20 SURFACE WATER MN-54 < 4.9 12-Oct-20 SURFACE WATER CO-58 < 4.6 12-Oct-20 SURFACE WATER FE-59 < 8.2 12-Oct-20 SURFACE WATER CO-60 < 2.9 12-Oct-20 SURFACE WATER ZN-65 < 8.8 12-Oct-20 SURFACE WATER ZR-NB-95 < 4.3 12-Oct-20 SURFACE WATER I-131 < 5.9 12-Oct-20 SURFACE WATER CS-134 < 5.1 12-Oct-20 SURFACE WATER CS-137 < 4.9 12-Oct-20 SURFACE WATER BA-LA-140 < 4.0 12-Oct-20 SURFACE WATER H-3 11,275 +/- 327.0 16-Nov-20 SURFACE WATER MN-54 < 3.2 2020 Annual Radiological Environmental Operating Report Page C - 27 Wolf Creek Generating Station

Exposure Pathway - Waterborne Surface Water Location: SP Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 16-Nov-20 SURFACE WATER CO-58 < 4.8 16-Nov-20 SURFACE WATER FE-59 < 4.3 16-Nov-20 SURFACE WATER CO-60 < 2.7 16-Nov-20 SURFACE WATER ZN-65 < 8.8 16-Nov-20 SURFACE WATER ZR-NB-95 < 5.6 16-Nov-20 SURFACE WATER I-131 < 8.7 16-Nov-20 SURFACE WATER CS-134 < 5.1 16-Nov-20 SURFACE WATER CS-137 < 5.4 16-Nov-20 SURFACE WATER BA-LA-140 < 3.9 16-Nov-20 SURFACE WATER H-3 11,618 +/- 330.0 16-Nov-20 SURFACE WATER FE-55 < 166.0 07-Dec-20 SURFACE WATER MN-54 < 5.5 07-Dec-20 SURFACE WATER CO-58 < 5.2 07-Dec-20 SURFACE WATER FE-59 < 4.6 07-Dec-20 SURFACE WATER CO-60 < 3.3 07-Dec-20 SURFACE WATER ZN-65 < 10.0 07-Dec-20 SURFACE WATER ZR-NB-95 < 3.1 07-Dec-20 SURFACE WATER I-131 < 9.6 07-Dec-20 SURFACE WATER CS-134 < 5.5 07-Dec-20 SURFACE WATER CS-137 < 5.4 07-Dec-20 SURFACE WATER BA-LA-140 < 5.7 07-Dec-20 SURFACE WATER H-3 11,991 +/- 335.0 2020 Annual Radiological Environmental Operating Report Page C - 28 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: B-12 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 10-Feb-20 GROUND WATER MN-54 < 4.4 10-Feb-20 GROUND WATER CO-58 < 3.3 10-Feb-20 GROUND WATER FE-59 < 6.9 10-Feb-20 GROUND WATER CO-60 < 1.8 10-Feb-20 GROUND WATER ZN-65 < 9.5 10-Feb-20 GROUND WATER ZR-NB-95 < 4.4 10-Feb-20 GROUND WATER I-131 < 0.299 10-Feb-20 GROUND WATER CS-134 < 4.4 10-Feb-20 GROUND WATER CS-137 < 4.1 10-Feb-20 GROUND WATER BA-LA-140 < 3.9 10-Feb-20 GROUND WATER H-3 < 154.0 11-May-20 GROUND WATER MN-54 < 2.4 11-May-20 GROUND WATER CO-58 < 2.5 11-May-20 GROUND WATER FE-59 < 5.7 11-May-20 GROUND WATER CO-60 < 1.7 11-May-20 GROUND WATER ZN-65 < 5.9 11-May-20 GROUND WATER ZR-NB-95 < 3.1 11-May-20 GROUND WATER I-131 < 0.239 11-May-20 GROUND WATER CS-134 < 3.7 11-May-20 GROUND WATER CS-137 < 2.4 11-May-20 GROUND WATER BA-LA-140 < 3.5 11-May-20 GROUND WATER H-3 < 153.0 10-Aug-20 GROUND WATER MN-54 < 4.2 10-Aug-20 GROUND WATER CO-58 < 3.2 10-Aug-20 GROUND WATER FE-59 < 4.7 10-Aug-20 GROUND WATER CO-60 < 3.2 10-Aug-20 GROUND WATER ZN-65 < 2.3 10-Aug-20 GROUND WATER ZR-NB-95 < 3.8 10-Aug-20 GROUND WATER I-131 < 0.231 10-Aug-20 GROUND WATER CS-134 < 4.6 10-Aug-20 GROUND WATER CS-137 < 3.2 10-Aug-20 GROUND WATER BA-LA-140 < 1.7 10-Aug-20 GROUND WATER H-3 < 158.0 16-Nov-20 GROUND WATER MN-54 < 1.9 16-Nov-20 GROUND WATER CO-58 < 1.4 16-Nov-20 GROUND WATER FE-59 < 2.3 16-Nov-20 GROUND WATER CO-60 < 2.3 16-Nov-20 GROUND WATER ZN-65 < 3.8 2020 Annual Radiological Environmental Operating Report Page C - 29 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: B-12 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 16-Nov-20 GROUND WATER ZR-NB-95 < 3.3 16-Nov-20 GROUND WATER I-131 < 0.225 16-Nov-20 GROUND WATER CS-134 < 3.7 16-Nov-20 GROUND WATER CS-137 < 2.1 16-Nov-20 GROUND WATER BA-LA-140 < 3.0 16-Nov-20 GROUND WATER H-3 < 157.0 2020 Annual Radiological Environmental Operating Report Page C - 30 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: C-10 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 10-Feb-20 GROUND WATER MN-54 < 3.2 10-Feb-20 GROUND WATER CO-58 < 2.9 10-Feb-20 GROUND WATER FE-59 < 7.4 10-Feb-20 GROUND WATER CO-60 < 2.1 10-Feb-20 GROUND WATER ZN-65 < 5.9 10-Feb-20 GROUND WATER ZR-NB-95 < 3.7 10-Feb-20 GROUND WATER I-131 < 0.284 10-Feb-20 GROUND WATER CS-134 < 3.7 10-Feb-20 GROUND WATER CS-137 < 3.6 10-Feb-20 GROUND WATER BA-LA-140 < 2.2 10-Feb-20 GROUND WATER H-3 < 154.0 11-May-20 GROUND WATER MN-54 < 1.9 11-May-20 GROUND WATER CO-58 < 2.9 11-May-20 GROUND WATER FE-59 < 4.5 11-May-20 GROUND WATER CO-60 < 2.1 11-May-20 GROUND WATER ZN-65 < 4.4 11-May-20 GROUND WATER ZR-NB-95 < 3.4 11-May-20 GROUND WATER I-131 < 0.257 11-May-20 GROUND WATER CS-134 < 2.7 11-May-20 GROUND WATER CS-137 < 3.4 11-May-20 GROUND WATER BA-LA-140 < 2.8 11-May-20 GROUND WATER H-3 < 153.0 10-Aug-20 GROUND WATER MN-54 < 4.7 10-Aug-20 GROUND WATER CO-58 < 3.1 10-Aug-20 GROUND WATER FE-59 < 4.5 10-Aug-20 GROUND WATER CO-60 < 3.3 10-Aug-20 GROUND WATER ZN-65 < 12.7 10-Aug-20 GROUND WATER ZR-NB-95 < 7.3 10-Aug-20 GROUND WATER I-131 < 0.49 10-Aug-20 GROUND WATER CS-134 < 5.7 10-Aug-20 GROUND WATER CS-137 < 3.9 10-Aug-20 GROUND WATER BA-LA-140 < 5.6 10-Aug-20 GROUND WATER H-3 < 158.0 16-Nov-20 GROUND WATER MN-54 < 4.1 16-Nov-20 GROUND WATER CO-58 < 5.5 16-Nov-20 GROUND WATER FE-59 < 7.3 16-Nov-20 GROUND WATER CO-60 < 4.3 16-Nov-20 GROUND WATER ZN-65 < 11.7 2020 Annual Radiological Environmental Operating Report Page C - 31 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: C-10 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 16-Nov-20 GROUND WATER ZR-NB-95 < 3.7 16-Nov-20 GROUND WATER I-131 < 0.236 16-Nov-20 GROUND WATER CS-134 < 6.1 16-Nov-20 GROUND WATER CS-137 < 5.7 16-Nov-20 GROUND WATER BA-LA-140 < 5.0 16-Nov-20 GROUND WATER H-3 < 157.0 2020 Annual Radiological Environmental Operating Report Page C - 32 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: C-49 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 10-Feb-20 GROUND WATER MN-54 < 3.3 10-Feb-20 GROUND WATER CO-58 < 2.1 10-Feb-20 GROUND WATER FE-59 < 5.3 10-Feb-20 GROUND WATER CO-60 < 1.7 10-Feb-20 GROUND WATER ZN-65 < 7.4 10-Feb-20 GROUND WATER ZR-NB-95 < 2.9 10-Feb-20 GROUND WATER I-131 < 0.266 10-Feb-20 GROUND WATER CS-134 < 3.4 10-Feb-20 GROUND WATER CS-137 < 2.6 10-Feb-20 GROUND WATER BA-LA-140 < 2.0 10-Feb-20 GROUND WATER H-3 < 154.0 11-May-20 GROUND WATER MN-54 < 1.9 11-May-20 GROUND WATER CO-58 < 2.0 11-May-20 GROUND WATER FE-59 < 2.8 11-May-20 GROUND WATER CO-60 < 1.7 11-May-20 GROUND WATER ZN-65 < 3.0 11-May-20 GROUND WATER ZR-NB-95 < 1.6 11-May-20 GROUND WATER I-131 < 0.262 11-May-20 GROUND WATER CS-134 < 2.3 11-May-20 GROUND WATER CS-137 < 2.7 11-May-20 GROUND WATER BA-LA-140 < 2.0 11-May-20 GROUND WATER H-3 < 153.0 10-Aug-20 GROUND WATER MN-54 < 2.4 10-Aug-20 GROUND WATER CO-58 < 2.9 10-Aug-20 GROUND WATER FE-59 < 4.5 10-Aug-20 GROUND WATER CO-60 < 1.9 10-Aug-20 GROUND WATER ZN-65 < 5.1 10-Aug-20 GROUND WATER ZR-NB-95 < 4.4 10-Aug-20 GROUND WATER I-131 < 0.337 10-Aug-20 GROUND WATER CS-134 < 3.4 10-Aug-20 GROUND WATER CS-137 < 3.2 10-Aug-20 GROUND WATER BA-LA-140 < 2.2 10-Aug-20 GROUND WATER H-3 < 158.0 16-Nov-20 GROUND WATER MN-54 < 2.3 16-Nov-20 GROUND WATER CO-58 < 2.5 16-Nov-20 GROUND WATER FE-59 < 3.9 16-Nov-20 GROUND WATER CO-60 < 1.7 16-Nov-20 GROUND WATER ZN-65 < 4.9 2020 Annual Radiological Environmental Operating Report Page C - 33 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: C-49 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 16-Nov-20 GROUND WATER ZR-NB-95 < 2.6 16-Nov-20 GROUND WATER I-131 < 0.438 16-Nov-20 GROUND WATER CS-134 < 3.2 16-Nov-20 GROUND WATER CS-137 < 3.8 16-Nov-20 GROUND WATER BA-LA-140 < 1.2 16-Nov-20 GROUND WATER H-3 < 157.0 2020 Annual Radiological Environmental Operating Report Page C - 34 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: F-1 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 10-Feb-20 GROUND WATER MN-54 < 1.7 Duplicate 10-Feb-20 GROUND WATER MN-54 < 3.7 10-Feb-20 GROUND WATER CO-58 < 1.1 Duplicate 10-Feb-20 GROUND WATER CO-58 < 2.8 10-Feb-20 GROUND WATER FE-59 < 6.9 10-Feb-20 GROUND WATER FE-59 < 5.4 Duplicate 10-Feb-20 GROUND WATER CO-60 < 2.9 10-Feb-20 GROUND WATER CO-60 < 2.0 Duplicate 10-Feb-20 GROUND WATER ZN-65 < 6.7 10-Feb-20 GROUND WATER ZN-65 < 3.7 Duplicate 10-Feb-20 GROUND WATER ZR-NB-95 < 3.9 10-Feb-20 GROUND WATER ZR-NB-95 < 1.9 Duplicate 10-Feb-20 GROUND WATER I-131 < 0.377 10-Feb-20 GROUND WATER I-131 < 0.329 Duplicate 10-Feb-20 GROUND WATER CS-134 < 4.2 10-Feb-20 GROUND WATER CS-134 < 3.7 Duplicate 10-Feb-20 GROUND WATER CS-137 < 1.9 10-Feb-20 GROUND WATER CS-137 < 2.7 Duplicate 10-Feb-20 GROUND WATER BA-LA-140 < 2.1 10-Feb-20 GROUND WATER BA-LA-140 < 1.6 Duplicate 10-Feb-20 GROUND WATER H-3 < 154.0 10-Feb-20 GROUND WATER H-3 < 154.0 Duplicate 11-May-20 GROUND WATER MN-54 < 3.9 11-May-20 GROUND WATER CO-58 < 3.8 11-May-20 GROUND WATER FE-59 < 6.8 11-May-20 GROUND WATER CO-60 < 3.2 11-May-20 GROUND WATER ZN-65 < 8.0 11-May-20 GROUND WATER ZR-NB-95 < 3.3 11-May-20 GROUND WATER I-131 < 0.229 11-May-20 GROUND WATER CS-134 < 3.1 11-May-20 GROUND WATER CS-137 < 3.5 11-May-20 GROUND WATER BA-LA-140 < 5.0 11-May-20 GROUND WATER H-3 < 153.0 10-Aug-20 GROUND WATER MN-54 < 2.3 10-Aug-20 GROUND WATER CO-58 < 2.7 10-Aug-20 GROUND WATER FE-59 < 6.5 10-Aug-20 GROUND WATER CO-60 < 3.3 10-Aug-20 GROUND WATER ZN-65 < 3.0 2020 Annual Radiological Environmental Operating Report Page C - 35 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: F-1 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 10-Aug-20 GROUND WATER ZR-NB-95 < 3.5 10-Aug-20 GROUND WATER I-131 < 0.277 10-Aug-20 GROUND WATER CS-134 < 4.3 10-Aug-20 GROUND WATER CS-137 < 3.3 10-Aug-20 GROUND WATER BA-LA-140 < 3.8 10-Aug-20 GROUND WATER H-3 < 158.0 16-Nov-20 GROUND WATER MN-54 < 2.2 16-Nov-20 GROUND WATER CO-58 < 1.8 16-Nov-20 GROUND WATER FE-59 < 5.2 16-Nov-20 GROUND WATER CO-60 < 3.1 16-Nov-20 GROUND WATER ZN-65 < 2.4 16-Nov-20 GROUND WATER ZR-NB-95 < 3.6 16-Nov-20 GROUND WATER I-131 < 0.388 16-Nov-20 GROUND WATER CS-134 < 3.7 16-Nov-20 GROUND WATER CS-137 < 2.8 16-Nov-20 GROUND WATER BA-LA-140 < 3.5 16-Nov-20 GROUND WATER H-3 < 157.0 2020 Annual Radiological Environmental Operating Report Page C - 36 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: G-2 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 10-Feb-20 GROUND WATER MN-54 < 2.3 10-Feb-20 GROUND WATER CO-58 < 2.7 10-Feb-20 GROUND WATER FE-59 < 9.2 10-Feb-20 GROUND WATER CO-60 < 2.9 10-Feb-20 GROUND WATER ZN-65 < 11.5 10-Feb-20 GROUND WATER ZR-NB-95 < 6.3 10-Feb-20 GROUND WATER I-131 < 0.252 10-Feb-20 GROUND WATER CS-134 < 4.6 10-Feb-20 GROUND WATER CS-137 < 5.1 10-Feb-20 GROUND WATER BA-LA-140 < 4.2 10-Feb-20 GROUND WATER H-3 < 154.0 11-May-20 GROUND WATER MN-54 < 4.8 11-May-20 GROUND WATER CO-58 < 3.8 11-May-20 GROUND WATER FE-59 < 2.8 11-May-20 GROUND WATER CO-60 < 2.8 11-May-20 GROUND WATER ZN-65 < 7.8 11-May-20 GROUND WATER ZR-NB-95 < 2.8 11-May-20 GROUND WATER I-131 < 0.219 11-May-20 GROUND WATER CS-134 < 3.7 11-May-20 GROUND WATER CS-137 < 4.0 11-May-20 GROUND WATER BA-LA-140 < 5.1 11-May-20 GROUND WATER H-3 < 153.0 10-Aug-20 GROUND WATER MN-54 < 4.7 10-Aug-20 GROUND WATER MN-54 < 4.9 Duplicate 10-Aug-20 GROUND WATER CO-58 < 3.1 10-Aug-20 GROUND WATER CO-58 < 2.5 Duplicate 10-Aug-20 GROUND WATER FE-59 < 3.7 10-Aug-20 GROUND WATER FE-59 < 4.9 Duplicate 10-Aug-20 GROUND WATER CO-60 < 3.4 10-Aug-20 GROUND WATER CO-60 < 3.3 Duplicate 10-Aug-20 GROUND WATER ZN-65 < 6.8 Duplicate 10-Aug-20 GROUND WATER ZN-65 < 7.3 10-Aug-20 GROUND WATER ZR-NB-95 < 4.2 Duplicate 10-Aug-20 GROUND WATER ZR-NB-95 < 5.5 10-Aug-20 GROUND WATER I-131 < 0.468 Duplicate 10-Aug-20 GROUND WATER I-131 < 0.302 10-Aug-20 GROUND WATER CS-134 < 4.8 Duplicate 10-Aug-20 GROUND WATER CS-134 < 4.4 2020 Annual Radiological Environmental Operating Report Page C - 37 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: G-2 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 10-Aug-20 GROUND WATER CS-137 < 4.3 10-Aug-20 GROUND WATER CS-137 < 3.1 Duplicate 10-Aug-20 GROUND WATER BA-LA-140 < 4.4 Duplicate 10-Aug-20 GROUND WATER BA-LA-140 < 4.9 10-Aug-20 GROUND WATER H-3 < 158.0 10-Aug-20 GROUND WATER H-3 < 158.0 Duplicate 16-Nov-20 GROUND WATER MN-54 < 4.0 16-Nov-20 GROUND WATER CO-58 < 2.5 16-Nov-20 GROUND WATER FE-59 < 5.7 16-Nov-20 GROUND WATER CO-60 < 2.7 16-Nov-20 GROUND WATER ZN-65 < 6.2 16-Nov-20 GROUND WATER ZR-NB-95 < 4.5 16-Nov-20 GROUND WATER I-131 < 0.425 16-Nov-20 GROUND WATER CS-134 < 5.2 16-Nov-20 GROUND WATER CS-137 < 4.1 16-Nov-20 GROUND WATER BA-LA-140 < 4.2 16-Nov-20 GROUND WATER H-3 < 157.0 2020 Annual Radiological Environmental Operating Report Page C - 38 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: J-1 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 10-Feb-20 GROUND WATER MN-54 < 2.3 10-Feb-20 GROUND WATER CO-58 < 3.7 10-Feb-20 GROUND WATER FE-59 < 8.4 10-Feb-20 GROUND WATER CO-60 < 2.4 10-Feb-20 GROUND WATER ZN-65 < 7.3 10-Feb-20 GROUND WATER ZR-NB-95 < 4.8 10-Feb-20 GROUND WATER I-131 < 0.476 10-Feb-20 GROUND WATER CS-134 < 4.1 10-Feb-20 GROUND WATER CS-137 < 3.0 10-Feb-20 GROUND WATER BA-LA-140 < 3.7 10-Feb-20 GROUND WATER H-3 < 154.0 11-May-20 GROUND WATER MN-54 < 3.2 11-May-20 GROUND WATER CO-58 < 2.1 11-May-20 GROUND WATER FE-59 < 4.0 11-May-20 GROUND WATER CO-60 < 2.0 11-May-20 GROUND WATER ZN-65 < 3.1 11-May-20 GROUND WATER ZR-NB-95 < 1.6 11-May-20 GROUND WATER I-131 < 0.226 11-May-20 GROUND WATER CS-134 < 3.8 11-May-20 GROUND WATER CS-137 < 2.5 11-May-20 GROUND WATER BA-LA-140 < 3.2 11-May-20 GROUND WATER H-3 < 153.0 10-Aug-20 GROUND WATER MN-54 < 2.0 10-Aug-20 GROUND WATER CO-58 < 2.4 10-Aug-20 GROUND WATER FE-59 < 2.6 10-Aug-20 GROUND WATER CO-60 < 2.6 10-Aug-20 GROUND WATER ZN-65 < 3.4 10-Aug-20 GROUND WATER ZR-NB-95 < 1.6 10-Aug-20 GROUND WATER I-131 < 0.433 10-Aug-20 GROUND WATER CS-134 < 3.2 10-Aug-20 GROUND WATER CS-137 < 2.2 10-Aug-20 GROUND WATER BA-LA-140 < 3.3 10-Aug-20 GROUND WATER H-3 < 158.0 16-Nov-20 GROUND WATER MN-54 < 3.3 16-Nov-20 GROUND WATER CO-58 < 2.9 16-Nov-20 GROUND WATER FE-59 < 3.5 16-Nov-20 GROUND WATER CO-60 < 3.1 16-Nov-20 GROUND WATER ZN-65 < 8.4 2020 Annual Radiological Environmental Operating Report Page C - 39 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: J-1 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 16-Nov-20 GROUND WATER ZR-NB-95 < 2.3 16-Nov-20 GROUND WATER I-131 < 0.247 16-Nov-20 GROUND WATER CS-134 < 5.2 16-Nov-20 GROUND WATER CS-137 < 5.4 16-Nov-20 GROUND WATER BA-LA-140 < 1.7 16-Nov-20 GROUND WATER H-3 < 157.0 2020 Annual Radiological Environmental Operating Report Page C - 40 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: J-2 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 10-Feb-20 GROUND WATER MN-54 < 1.7 10-Feb-20 GROUND WATER CO-58 < 2.4 10-Feb-20 GROUND WATER FE-59 < 3.4 10-Feb-20 GROUND WATER CO-60 < 2.0 10-Feb-20 GROUND WATER ZN-65 < 4.8 10-Feb-20 GROUND WATER ZR-NB-95 < 3.1 10-Feb-20 GROUND WATER I-131 < 0.353 10-Feb-20 GROUND WATER CS-134 < 2.9 10-Feb-20 GROUND WATER CS-137 < 2.5 10-Feb-20 GROUND WATER BA-LA-140 < 2.0 10-Feb-20 GROUND WATER H-3 < 154.0 11-May-20 GROUND WATER MN-54 < 4.1 11-May-20 GROUND WATER CO-58 < 2.9 11-May-20 GROUND WATER FE-59 < 4.0 11-May-20 GROUND WATER CO-60 < 2.2 11-May-20 GROUND WATER ZN-65 < 6.6 11-May-20 GROUND WATER ZR-NB-95 < 2.9 11-May-20 GROUND WATER I-131 < 0.251 11-May-20 GROUND WATER CS-134 < 4.7 11-May-20 GROUND WATER CS-137 < 3.7 11-May-20 GROUND WATER BA-LA-140 < 3.8 11-May-20 GROUND WATER H-3 < 153.0 10-Aug-20 GROUND WATER MN-54 < 3.0 10-Aug-20 GROUND WATER CO-58 < 2.0 10-Aug-20 GROUND WATER FE-59 < 5.7 10-Aug-20 GROUND WATER CO-60 < 1.7 10-Aug-20 GROUND WATER ZN-65 < 6.6 10-Aug-20 GROUND WATER ZR-NB-95 < 3.8 10-Aug-20 GROUND WATER I-131 < 0.264 10-Aug-20 GROUND WATER CS-134 < 3.2 10-Aug-20 GROUND WATER CS-137 < 3.9 10-Aug-20 GROUND WATER BA-LA-140 < 2.4 10-Aug-20 GROUND WATER H-3 < 158.0 16-Nov-20 GROUND WATER MN-54 < 2.2 16-Nov-20 GROUND WATER CO-58 < 1.9 16-Nov-20 GROUND WATER FE-59 < 5.2 16-Nov-20 GROUND WATER CO-60 < 2.0 16-Nov-20 GROUND WATER ZN-65 < 5.5 2020 Annual Radiological Environmental Operating Report Page C - 41 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: J-2 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 16-Nov-20 GROUND WATER ZR-NB-95 < 3.8 16-Nov-20 GROUND WATER I-131 < 0.209 16-Nov-20 GROUND WATER CS-134 < 3.2 16-Nov-20 GROUND WATER CS-137 < 2.9 16-Nov-20 GROUND WATER BA-LA-140 < 1.4 16-Nov-20 GROUND WATER H-3 < 157.0 2020 Annual Radiological Environmental Operating Report Page C - 42 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-06A Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 05-Mar-20 LAKE PERIMETER MN-54 < 4.4 05-Mar-20 LAKE PERIMETER CO-58 < 2.9 05-Mar-20 LAKE PERIMETER FE-59 < 3.4 05-Mar-20 LAKE PERIMETER CO-60 < 3.6 05-Mar-20 LAKE PERIMETER ZN-65 < 3.2 05-Mar-20 LAKE PERIMETER ZR-NB-95 < 3.5 05-Mar-20 LAKE PERIMETER I-131 < 0.288 05-Mar-20 LAKE PERIMETER CS-134 < 3.0 05-Mar-20 LAKE PERIMETER CS-137 < 3.2 05-Mar-20 LAKE PERIMETER BA-LA-140 < 2.8 05-Mar-20 LAKE PERIMETER H-3 < 157.0 20-May-20 LAKE PERIMETER MN-54 < 2.7 20-May-20 LAKE PERIMETER CO-58 < 1.9 20-May-20 LAKE PERIMETER FE-59 < 6.2 20-May-20 LAKE PERIMETER CO-60 < 2.4 20-May-20 LAKE PERIMETER ZN-65 < 2.7 20-May-20 LAKE PERIMETER ZR-NB-95 < 3.0 20-May-20 LAKE PERIMETER I-131 < 0.313 20-May-20 LAKE PERIMETER CS-134 < 3.8 20-May-20 LAKE PERIMETER CS-137 < 3.6 20-May-20 LAKE PERIMETER BA-LA-140 < 2.3 20-May-20 LAKE PERIMETER H-3 < 158.0 15-Sep-20 LAKE PERIMETER MN-54 < 4.2 15-Sep-20 LAKE PERIMETER CO-58 < 4.5 15-Sep-20 LAKE PERIMETER FE-59 < 7.3 15-Sep-20 LAKE PERIMETER CO-60 < 3.5 15-Sep-20 LAKE PERIMETER ZN-65 < 10.2 15-Sep-20 LAKE PERIMETER ZR-NB-95 < 5.0 15-Sep-20 LAKE PERIMETER I-131 < 0.454 15-Sep-20 LAKE PERIMETER CS-134 < 5.7 15-Sep-20 LAKE PERIMETER CS-137 < 4.6 15-Sep-20 LAKE PERIMETER BA-LA-140 < 2.4 15-Sep-20 LAKE PERIMETER H-3 < 159.0 14-Oct-20 LAKE PERIMETER MN-54 < 3.6 14-Oct-20 LAKE PERIMETER CO-58 < 2.1 14-Oct-20 LAKE PERIMETER FE-59 < 6.5 14-Oct-20 LAKE PERIMETER CO-60 < 1.5 14-Oct-20 LAKE PERIMETER ZN-65 < 2.2 2020 Annual Radiological Environmental Operating Report Page C - 43 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-06A Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 14-Oct-20 LAKE PERIMETER ZR-NB-95 < 2.8 14-Oct-20 LAKE PERIMETER I-131 < 0.304 14-Oct-20 LAKE PERIMETER CS-134 < 3.8 14-Oct-20 LAKE PERIMETER CS-137 < 2.3 14-Oct-20 LAKE PERIMETER BA-LA-140 < 3.0 14-Oct-20 LAKE PERIMETER H-3 < 157.0 2020 Annual Radiological Environmental Operating Report Page C - 44 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-06C Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 05-Mar-20 LAKE PERIMETER MN-54 < 2.3 05-Mar-20 LAKE PERIMETER CO-58 < 2.4 05-Mar-20 LAKE PERIMETER FE-59 < 5.6 05-Mar-20 LAKE PERIMETER CO-60 < 2.7 05-Mar-20 LAKE PERIMETER ZN-65 < 3.7 05-Mar-20 LAKE PERIMETER ZR-NB-95 < 3.5 05-Mar-20 LAKE PERIMETER I-131 < 0.337 05-Mar-20 LAKE PERIMETER CS-134 < 4.1 05-Mar-20 LAKE PERIMETER CS-137 < 2.6 05-Mar-20 LAKE PERIMETER BA-LA-140 < 2.7 05-Mar-20 LAKE PERIMETER H-3 < 157.0 20-May-20 LAKE PERIMETER MN-54 < 1.1 20-May-20 LAKE PERIMETER CO-58 < 2.1 20-May-20 LAKE PERIMETER FE-59 < 3.9 20-May-20 LAKE PERIMETER CO-60 < 2.4 20-May-20 LAKE PERIMETER ZN-65 < 1.2 20-May-20 LAKE PERIMETER ZR-NB-95 < 1.9 20-May-20 LAKE PERIMETER I-131 < 0.365 20-May-20 LAKE PERIMETER CS-134 < 2.3 20-May-20 LAKE PERIMETER CS-137 < 2.5 20-May-20 LAKE PERIMETER BA-LA-140 < 1.0 20-May-20 LAKE PERIMETER H-3 < 158.0 15-Sep-20 LAKE PERIMETER MN-54 < 2.6 15-Sep-20 LAKE PERIMETER CO-58 < 2.6 15-Sep-20 LAKE PERIMETER FE-59 < 6.1 15-Sep-20 LAKE PERIMETER CO-60 < 2.2 15-Sep-20 LAKE PERIMETER ZN-65 < 3.9 15-Sep-20 LAKE PERIMETER ZR-NB-95 < 3.6 15-Sep-20 LAKE PERIMETER I-131 < 0.465 15-Sep-20 LAKE PERIMETER CS-134 < 4.1 15-Sep-20 LAKE PERIMETER CS-137 < 3.5 15-Sep-20 LAKE PERIMETER BA-LA-140 < 1.7 15-Sep-20 LAKE PERIMETER H-3 < 159.0 14-Oct-20 LAKE PERIMETER MN-54 < 2.8 14-Oct-20 LAKE PERIMETER CO-58 < 2.7 14-Oct-20 LAKE PERIMETER FE-59 < 3.1 14-Oct-20 LAKE PERIMETER CO-60 < 3.1 14-Oct-20 LAKE PERIMETER ZN-65 < 5.8 2020 Annual Radiological Environmental Operating Report Page C - 45 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-06C Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 14-Oct-20 LAKE PERIMETER ZR-NB-95 < 3.3 14-Oct-20 LAKE PERIMETER I-131 < 0.491 14-Oct-20 LAKE PERIMETER CS-134 < 3.7 14-Oct-20 LAKE PERIMETER CS-137 < 1.4 14-Oct-20 LAKE PERIMETER BA-LA-140 < 5.1 14-Oct-20 LAKE PERIMETER H-3 < 157.0 2020 Annual Radiological Environmental Operating Report Page C - 46 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-07A Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 05-Mar-20 LAKE PERIMETER MN-54 < 2.0 05-Mar-20 LAKE PERIMETER CO-58 < 2.4 05-Mar-20 LAKE PERIMETER FE-59 < 3.3 05-Mar-20 LAKE PERIMETER CO-60 < 2.5 05-Mar-20 LAKE PERIMETER ZN-65 < 5.1 05-Mar-20 LAKE PERIMETER ZR-NB-95 < 2.8 05-Mar-20 LAKE PERIMETER I-131 < 0.481 05-Mar-20 LAKE PERIMETER CS-134 < 3.3 05-Mar-20 LAKE PERIMETER CS-137 < 3.8 05-Mar-20 LAKE PERIMETER BA-LA-140 < 1.6 05-Mar-20 LAKE PERIMETER H-3 < 157.0 20-May-20 LAKE PERIMETER MN-54 < 4.6 20-May-20 LAKE PERIMETER CO-58 < 3.5 20-May-20 LAKE PERIMETER FE-59 < 4.3 20-May-20 LAKE PERIMETER CO-60 < 3.2 20-May-20 LAKE PERIMETER ZN-65 < 7.0 20-May-20 LAKE PERIMETER ZR-NB-95 < 3.3 20-May-20 LAKE PERIMETER I-131 < 0.305 20-May-20 LAKE PERIMETER CS-134 < 3.8 20-May-20 LAKE PERIMETER CS-137 < 3.4 20-May-20 LAKE PERIMETER BA-LA-140 < 4.0 20-May-20 LAKE PERIMETER H-3 < 158.0 15-Sep-20 LAKE PERIMETER MN-54 < 2.7 15-Sep-20 LAKE PERIMETER CO-58 < 2.9 15-Sep-20 LAKE PERIMETER FE-59 < 4.0 15-Sep-20 LAKE PERIMETER CO-60 < 3.2 15-Sep-20 LAKE PERIMETER ZN-65 < 1.9 15-Sep-20 LAKE PERIMETER ZR-NB-95 < 3.6 15-Sep-20 LAKE PERIMETER I-131 < 0.401 15-Sep-20 LAKE PERIMETER CS-134 < 3.9 15-Sep-20 LAKE PERIMETER CS-137 < 1.9 15-Sep-20 LAKE PERIMETER BA-LA-140 < 3.2 15-Sep-20 LAKE PERIMETER H-3 < 159.0 14-Oct-20 LAKE PERIMETER MN-54 < 2.7 14-Oct-20 LAKE PERIMETER CO-58 < 2.0 14-Oct-20 LAKE PERIMETER FE-59 < 3.4 14-Oct-20 LAKE PERIMETER CO-60 < 2.5 14-Oct-20 LAKE PERIMETER ZN-65 < 4.4 2020 Annual Radiological Environmental Operating Report Page C - 47 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-07A Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 14-Oct-20 LAKE PERIMETER ZR-NB-95 < 3.8 14-Oct-20 LAKE PERIMETER I-131 < 0.417 14-Oct-20 LAKE PERIMETER CS-134 < 4.3 14-Oct-20 LAKE PERIMETER CS-137 < 3.5 14-Oct-20 LAKE PERIMETER BA-LA-140 < 2.8 14-Oct-20 LAKE PERIMETER H-3 < 157.0 2020 Annual Radiological Environmental Operating Report Page C - 48 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-07C Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 05-Mar-20 LAKE PERIMETER MN-54 < 2.1 05-Mar-20 LAKE PERIMETER CO-58 < 1.8 05-Mar-20 LAKE PERIMETER FE-59 < 5.2 05-Mar-20 LAKE PERIMETER CO-60 < 1.0 05-Mar-20 LAKE PERIMETER ZN-65 < 2.4 05-Mar-20 LAKE PERIMETER ZR-NB-95 < 2.1 05-Mar-20 LAKE PERIMETER I-131 < 0.33 05-Mar-20 LAKE PERIMETER CS-134 < 2.0 05-Mar-20 LAKE PERIMETER CS-137 < 1.8 05-Mar-20 LAKE PERIMETER BA-LA-140 < 3.3 05-Mar-20 LAKE PERIMETER H-3 < 157.0 20-May-20 LAKE PERIMETER MN-54 < 2.9 20-May-20 LAKE PERIMETER CO-58 < 3.2 20-May-20 LAKE PERIMETER FE-59 < 5.6 20-May-20 LAKE PERIMETER CO-60 < 1.6 20-May-20 LAKE PERIMETER ZN-65 < 5.4 20-May-20 LAKE PERIMETER ZR-NB-95 < 2.5 20-May-20 LAKE PERIMETER I-131 < 0.338 20-May-20 LAKE PERIMETER CS-134 < 3.4 20-May-20 LAKE PERIMETER CS-137 < 3.6 20-May-20 LAKE PERIMETER BA-LA-140 < 2.6 20-May-20 LAKE PERIMETER H-3 < 158.0 15-Sep-20 LAKE PERIMETER MN-54 < 3.7 15-Sep-20 LAKE PERIMETER CO-58 < 2.3 15-Sep-20 LAKE PERIMETER FE-59 < 3.2 15-Sep-20 LAKE PERIMETER CO-60 < 2.7 15-Sep-20 LAKE PERIMETER ZN-65 < 3.8 15-Sep-20 LAKE PERIMETER ZR-NB-95 < 3.0 15-Sep-20 LAKE PERIMETER I-131 < 0.27 15-Sep-20 LAKE PERIMETER CS-134 < 3.2 15-Sep-20 LAKE PERIMETER CS-137 < 3.3 15-Sep-20 LAKE PERIMETER BA-LA-140 < 1.8 15-Sep-20 LAKE PERIMETER H-3 < 159.0 14-Oct-20 LAKE PERIMETER MN-54 < 3.9 14-Oct-20 LAKE PERIMETER CO-58 < 2.8 14-Oct-20 LAKE PERIMETER FE-59 < 4.4 14-Oct-20 LAKE PERIMETER CO-60 < 2.2 14-Oct-20 LAKE PERIMETER ZN-65 < 6.1 2020 Annual Radiological Environmental Operating Report Page C - 49 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-07C Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 14-Oct-20 LAKE PERIMETER ZR-NB-95 < 3.0 14-Oct-20 LAKE PERIMETER I-131 < 0.413 14-Oct-20 LAKE PERIMETER CS-134 < 3.5 14-Oct-20 LAKE PERIMETER CS-137 < 3.5 14-Oct-20 LAKE PERIMETER BA-LA-140 < 1.5 14-Oct-20 LAKE PERIMETER H-3 < 157.0 2020 Annual Radiological Environmental Operating Report Page C - 50 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-08B Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 05-Mar-20 LAKE PERIMETER MN-54 < 5.2 05-Mar-20 LAKE PERIMETER CO-58 < 6.6 05-Mar-20 LAKE PERIMETER FE-59 < 6.4 05-Mar-20 LAKE PERIMETER CO-60 < 3.2 05-Mar-20 LAKE PERIMETER ZN-65 < 15.0 05-Mar-20 LAKE PERIMETER ZR-NB-95 < 7.9 05-Mar-20 LAKE PERIMETER I-131 < 0.288 05-Mar-20 LAKE PERIMETER CS-134 < 6.1 05-Mar-20 LAKE PERIMETER CS-137 < 5.3 05-Mar-20 LAKE PERIMETER BA-LA-140 < 7.1 05-Mar-20 LAKE PERIMETER H-3 319.0 +/- 90.0 20-May-20 LAKE PERIMETER MN-54 < 3.5 20-May-20 LAKE PERIMETER CO-58 < 2.4 20-May-20 LAKE PERIMETER FE-59 < 6.8 20-May-20 LAKE PERIMETER CO-60 < 2.1 20-May-20 LAKE PERIMETER ZN-65 < 7.6 20-May-20 LAKE PERIMETER ZR-NB-95 < 2.8 20-May-20 LAKE PERIMETER I-131 < 0.367 20-May-20 LAKE PERIMETER CS-134 < 4.4 20-May-20 LAKE PERIMETER CS-137 < 4.8 20-May-20 LAKE PERIMETER BA-LA-140 < 6.0 20-May-20 LAKE PERIMETER H-3 432.0 +/- 96.0 15-Sep-20 LAKE PERIMETER MN-54 < 4.2 15-Sep-20 LAKE PERIMETER CO-58 < 2.4 15-Sep-20 LAKE PERIMETER FE-59 < 6.2 15-Sep-20 LAKE PERIMETER CO-60 < 2.8 15-Sep-20 LAKE PERIMETER ZN-65 < 2.0 15-Sep-20 LAKE PERIMETER ZR-NB-95 < 5.1 15-Sep-20 LAKE PERIMETER I-131 < 0.391 15-Sep-20 LAKE PERIMETER CS-134 < 4.9 15-Sep-20 LAKE PERIMETER CS-137 < 4.6 15-Sep-20 LAKE PERIMETER BA-LA-140 < 2.5 15-Sep-20 LAKE PERIMETER H-3 < 159.0 14-Oct-20 LAKE PERIMETER MN-54 < 5.4 14-Oct-20 LAKE PERIMETER CO-58 < 5.0 14-Oct-20 LAKE PERIMETER FE-59 < 5.6 14-Oct-20 LAKE PERIMETER CO-60 < 5.3 14-Oct-20 LAKE PERIMETER ZN-65 < 5.8 2020 Annual Radiological Environmental Operating Report Page C - 51 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-08B Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 14-Oct-20 LAKE PERIMETER ZR-NB-95 < 2.8 14-Oct-20 LAKE PERIMETER I-131 < 0.292 14-Oct-20 LAKE PERIMETER CS-134 < 4.4 14-Oct-20 LAKE PERIMETER CS-137 < 5.3 14-Oct-20 LAKE PERIMETER BA-LA-140 < 3.6 14-Oct-20 LAKE PERIMETER H-3 160.0 +/- 82.0 2020 Annual Radiological Environmental Operating Report Page C - 52 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-08C Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 05-Mar-20 LAKE PERIMETER MN-54 < 3.0 05-Mar-20 LAKE PERIMETER CO-58 < 3.5 05-Mar-20 LAKE PERIMETER FE-59 < 6.2 05-Mar-20 LAKE PERIMETER CO-60 < 2.5 05-Mar-20 LAKE PERIMETER ZN-65 < 6.6 05-Mar-20 LAKE PERIMETER ZR-NB-95 < 5.2 05-Mar-20 LAKE PERIMETER I-131 < 0.309 05-Mar-20 LAKE PERIMETER CS-134 < 3.9 05-Mar-20 LAKE PERIMETER CS-137 < 3.0 05-Mar-20 LAKE PERIMETER BA-LA-140 < 2.2 05-Mar-20 LAKE PERIMETER H-3 < 157.0 20-May-20 LAKE PERIMETER MN-54 < 2.8 20-May-20 LAKE PERIMETER CO-58 < 2.2 20-May-20 LAKE PERIMETER FE-59 < 4.9 20-May-20 LAKE PERIMETER CO-60 < 2.5 20-May-20 LAKE PERIMETER ZN-65 < 3.5 20-May-20 LAKE PERIMETER ZR-NB-95 < 3.6 20-May-20 LAKE PERIMETER I-131 < 0.492 20-May-20 LAKE PERIMETER CS-134 < 3.8 20-May-20 LAKE PERIMETER CS-137 < 3.4 20-May-20 LAKE PERIMETER BA-LA-140 < 3.7 20-May-20 LAKE PERIMETER H-3 < 158.0 15-Sep-20 LAKE PERIMETER MN-54 < 2.4 15-Sep-20 LAKE PERIMETER CO-58 < 1.2 15-Sep-20 LAKE PERIMETER FE-59 < 3.5 15-Sep-20 LAKE PERIMETER CO-60 < 0.9 15-Sep-20 LAKE PERIMETER ZN-65 < 4.2 15-Sep-20 LAKE PERIMETER ZR-NB-95 < 1.7 15-Sep-20 LAKE PERIMETER I-131 < 0.272 15-Sep-20 LAKE PERIMETER CS-134 < 3.1 15-Sep-20 LAKE PERIMETER CS-137 < 2.0 15-Sep-20 LAKE PERIMETER BA-LA-140 < 1.6 15-Sep-20 LAKE PERIMETER H-3 < 159.0 14-Oct-20 LAKE PERIMETER MN-54 < 3.0 14-Oct-20 LAKE PERIMETER CO-58 < 1.8 14-Oct-20 LAKE PERIMETER FE-59 < 4.6 14-Oct-20 LAKE PERIMETER CO-60 < 2.6 14-Oct-20 LAKE PERIMETER ZN-65 < 2.1 2020 Annual Radiological Environmental Operating Report Page C - 53 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-08C Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 14-Oct-20 LAKE PERIMETER ZR-NB-95 < 4.0 14-Oct-20 LAKE PERIMETER I-131 < 0.298 14-Oct-20 LAKE PERIMETER CS-134 < 3.7 14-Oct-20 LAKE PERIMETER CS-137 < 2.8 14-Oct-20 LAKE PERIMETER BA-LA-140 < 3.5 14-Oct-20 LAKE PERIMETER H-3 < 157.0 2020 Annual Radiological Environmental Operating Report Page C - 54 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-09A Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 05-Mar-20 LAKE PERIMETER MN-54 < 3.2 05-Mar-20 LAKE PERIMETER CO-58 < 2.5 05-Mar-20 LAKE PERIMETER FE-59 < 7.3 05-Mar-20 LAKE PERIMETER CO-60 < 3.2 05-Mar-20 LAKE PERIMETER ZN-65 < 7.6 05-Mar-20 LAKE PERIMETER ZR-NB-95 < 5.7 05-Mar-20 LAKE PERIMETER I-131 < 0.29 05-Mar-20 LAKE PERIMETER CS-134 < 3.9 05-Mar-20 LAKE PERIMETER CS-137 < 2.4 05-Mar-20 LAKE PERIMETER BA-LA-140 < 2.5 05-Mar-20 LAKE PERIMETER H-3 < 157.0 20-May-20 LAKE PERIMETER MN-54 < 3.9 20-May-20 LAKE PERIMETER CO-58 < 3.5 20-May-20 LAKE PERIMETER FE-59 < 3.4 20-May-20 LAKE PERIMETER CO-60 < 2.2 20-May-20 LAKE PERIMETER ZN-65 < 7.9 20-May-20 LAKE PERIMETER ZR-NB-95 < 2.3 20-May-20 LAKE PERIMETER I-131 < 0.419 20-May-20 LAKE PERIMETER CS-134 < 3.0 20-May-20 LAKE PERIMETER CS-137 < 3.1 20-May-20 LAKE PERIMETER BA-LA-140 < 5.3 20-May-20 LAKE PERIMETER H-3 < 158.0 15-Sep-20 LAKE PERIMETER MN-54 < 3.7 15-Sep-20 LAKE PERIMETER CO-58 < 3.2 15-Sep-20 LAKE PERIMETER FE-59 < 3.7 15-Sep-20 LAKE PERIMETER CO-60 < 3.8 15-Sep-20 LAKE PERIMETER ZN-65 < 8.6 15-Sep-20 LAKE PERIMETER ZR-NB-95 < 3.7 15-Sep-20 LAKE PERIMETER I-131 < 0.47 15-Sep-20 LAKE PERIMETER CS-134 < 4.2 15-Sep-20 LAKE PERIMETER CS-137 < 4.8 15-Sep-20 LAKE PERIMETER BA-LA-140 < 2.8 15-Sep-20 LAKE PERIMETER H-3 < 159.0 14-Oct-20 LAKE PERIMETER MN-54 < 2.5 14-Oct-20 LAKE PERIMETER CO-58 < 2.2 14-Oct-20 LAKE PERIMETER FE-59 < 4.8 14-Oct-20 LAKE PERIMETER CO-60 < 2.5 14-Oct-20 LAKE PERIMETER ZN-65 < 4.2 2020 Annual Radiological Environmental Operating Report Page C - 55 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-09A Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 14-Oct-20 LAKE PERIMETER ZR-NB-95 < 4.0 14-Oct-20 LAKE PERIMETER I-131 < 0.292 14-Oct-20 LAKE PERIMETER CS-134 < 3.2 14-Oct-20 LAKE PERIMETER CS-137 < 2.8 14-Oct-20 LAKE PERIMETER BA-LA-140 < 2.2 14-Oct-20 LAKE PERIMETER H-3 < 157.0 2020 Annual Radiological Environmental Operating Report Page C - 56 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-10B Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 05-Mar-20 LAKE PERIMETER MN-54 < 2.2 05-Mar-20 LAKE PERIMETER CO-58 < 1.2 05-Mar-20 LAKE PERIMETER FE-59 < 3.9 05-Mar-20 LAKE PERIMETER CO-60 < 3.1 05-Mar-20 LAKE PERIMETER ZN-65 < 5.1 05-Mar-20 LAKE PERIMETER ZR-NB-95 < 2.6 05-Mar-20 LAKE PERIMETER I-131 < 0.288 05-Mar-20 LAKE PERIMETER CS-134 < 3.5 05-Mar-20 LAKE PERIMETER CS-137 < 3.8 05-Mar-20 LAKE PERIMETER BA-LA-140 < 2.1 05-Mar-20 LAKE PERIMETER H-3 < 153.0 20-May-20 LAKE PERIMETER MN-54 < 2.1 20-May-20 LAKE PERIMETER CO-58 < 2.4 20-May-20 LAKE PERIMETER FE-59 < 3.4 20-May-20 LAKE PERIMETER CO-60 < 1.4 20-May-20 LAKE PERIMETER ZN-65 < 3.5 20-May-20 LAKE PERIMETER ZR-NB-95 < 1.6 20-May-20 LAKE PERIMETER I-131 < 0.412 20-May-20 LAKE PERIMETER CS-134 < 2.5 20-May-20 LAKE PERIMETER CS-137 < 1.7 20-May-20 LAKE PERIMETER BA-LA-140 < 2.4 20-May-20 LAKE PERIMETER H-3 < 158.0 15-Sep-20 LAKE PERIMETER MN-54 < 2.4 15-Sep-20 LAKE PERIMETER CO-58 < 3.1 15-Sep-20 LAKE PERIMETER FE-59 < 6.1 15-Sep-20 LAKE PERIMETER CO-60 < 2.5 15-Sep-20 LAKE PERIMETER ZN-65 < 6.4 15-Sep-20 LAKE PERIMETER ZR-NB-95 < 2.7 15-Sep-20 LAKE PERIMETER I-131 < 0.487 15-Sep-20 LAKE PERIMETER CS-134 < 3.6 15-Sep-20 LAKE PERIMETER CS-137 < 2.6 15-Sep-20 LAKE PERIMETER BA-LA-140 < 1.8 15-Sep-20 LAKE PERIMETER H-3 < 159.0 14-Oct-20 LAKE PERIMETER MN-54 < 3.5 Duplicate 14-Oct-20 LAKE PERIMETER MN-54 < 2.7 14-Oct-20 LAKE PERIMETER CO-58 < 2.7 14-Oct-20 LAKE PERIMETER CO-58 < 3.1 Duplicate 14-Oct-20 LAKE PERIMETER FE-59 < 4.9 Duplicate 2020 Annual Radiological Environmental Operating Report Page C - 57 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-10B Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 14-Oct-20 LAKE PERIMETER FE-59 < 3.1 14-Oct-20 LAKE PERIMETER CO-60 < 2.5 Duplicate 14-Oct-20 LAKE PERIMETER CO-60 < 3.4 14-Oct-20 LAKE PERIMETER ZN-65 < 4.9 Duplicate 14-Oct-20 LAKE PERIMETER ZN-65 < 2.9 14-Oct-20 LAKE PERIMETER ZR-NB-95 < 4.3 Duplicate 14-Oct-20 LAKE PERIMETER ZR-NB-95 < 3.2 14-Oct-20 LAKE PERIMETER I-131 < 0.481 Duplicate 14-Oct-20 LAKE PERIMETER I-131 < 0.498 14-Oct-20 LAKE PERIMETER CS-134 < 3.8 Duplicate 14-Oct-20 LAKE PERIMETER CS-134 < 4.4 14-Oct-20 LAKE PERIMETER CS-137 < 3.4 14-Oct-20 LAKE PERIMETER CS-137 < 3.5 Duplicate 14-Oct-20 LAKE PERIMETER BA-LA-140 < 3.0 Duplicate 14-Oct-20 LAKE PERIMETER BA-LA-140 < 3.4 14-Oct-20 LAKE PERIMETER H-3 < 157.0 14-Oct-20 LAKE PERIMETER H-3 < 157.0 Duplicate 2020 Annual Radiological Environmental Operating Report Page C - 58 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-10C Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 05-Mar-20 LAKE PERIMETER MN-54 < 1.8 05-Mar-20 LAKE PERIMETER CO-58 < 1.4 05-Mar-20 LAKE PERIMETER FE-59 < 4.2 05-Mar-20 LAKE PERIMETER CO-60 < 2.0 05-Mar-20 LAKE PERIMETER ZN-65 < 2.5 05-Mar-20 LAKE PERIMETER ZR-NB-95 < 2.1 05-Mar-20 LAKE PERIMETER I-131 < 0.305 05-Mar-20 LAKE PERIMETER CS-134 < 1.5 05-Mar-20 LAKE PERIMETER CS-137 < 1.5 05-Mar-20 LAKE PERIMETER BA-LA-140 < 2.6 05-Mar-20 LAKE PERIMETER H-3 < 153.0 20-May-20 LAKE PERIMETER MN-54 < 3.1 20-May-20 LAKE PERIMETER CO-58 < 4.3 20-May-20 LAKE PERIMETER FE-59 < 7.7 20-May-20 LAKE PERIMETER CO-60 < 7.3 20-May-20 LAKE PERIMETER ZN-65 < 11.6 20-May-20 LAKE PERIMETER ZR-NB-95 < 7.6 20-May-20 LAKE PERIMETER I-131 < 0.336 20-May-20 LAKE PERIMETER CS-134 < 5.6 20-May-20 LAKE PERIMETER CS-137 < 5.4 20-May-20 LAKE PERIMETER BA-LA-140 < 8.1 20-May-20 LAKE PERIMETER H-3 < 158.0 15-Sep-20 LAKE PERIMETER MN-54 < 4.4 15-Sep-20 LAKE PERIMETER CO-58 < 3.1 15-Sep-20 LAKE PERIMETER FE-59 < 2.8 15-Sep-20 LAKE PERIMETER CO-60 < 3.9 15-Sep-20 LAKE PERIMETER ZN-65 < 7.2 15-Sep-20 LAKE PERIMETER ZR-NB-95 < 4.4 15-Sep-20 LAKE PERIMETER I-131 < 0.447 15-Sep-20 LAKE PERIMETER CS-134 < 3.9 15-Sep-20 LAKE PERIMETER CS-137 < 3.7 15-Sep-20 LAKE PERIMETER BA-LA-140 < 2.9 15-Sep-20 LAKE PERIMETER H-3 < 159.0 14-Oct-20 LAKE PERIMETER MN-54 < 3.9 14-Oct-20 LAKE PERIMETER CO-58 < 4.2 14-Oct-20 LAKE PERIMETER FE-59 < 7.5 14-Oct-20 LAKE PERIMETER CO-60 < 2.6 14-Oct-20 LAKE PERIMETER ZN-65 < 4.9 2020 Annual Radiological Environmental Operating Report Page C - 59 Wolf Creek Generating Station

Exposure Pathway - Waterborne Ground Water Location: MW-10C Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Liter) Analysis 14-Oct-20 LAKE PERIMETER ZR-NB-95 < 3.9 14-Oct-20 LAKE PERIMETER I-131 < 0.446 14-Oct-20 LAKE PERIMETER CS-134 < 5.2 14-Oct-20 LAKE PERIMETER CS-137 < 2.9 14-Oct-20 LAKE PERIMETER BA-LA-140 < 3.4 14-Oct-20 LAKE PERIMETER H-3 < 157.0 2020 Annual Radiological Environmental Operating Report Page C - 60 Wolf Creek Generating Station

Exposure Pathway - Waterborne Drinking Water Location: BW-15 Nuclide Concentration Duplicate Collection (pCi/Liter) Analysis Date 07-Jan-20 MN-54 < 1.7 07-Jan-20 CO-58 < 2.7 07-Jan-20 FE-59 < 5.5 07-Jan-20 CO-60 < 1.9 07-Jan-20 ZN-65 < 2.7 07-Jan-20 ZR-NB-95 < 2.2 07-Jan-20 I-131 < 0.267 07-Jan-20 CS-134 < 4.1 07-Jan-20 CS-137 < 3.7 07-Jan-20 BA-LA-140 < 3.4 07-Jan-20 GROSS BETA 1.557 +/- 0.573 06-Feb-20 MN-54 < 2.2 06-Feb-20 CO-58 < 2.7 06-Feb-20 FE-59 < 7.7 06-Feb-20 CO-60 < 2.5 06-Feb-20 ZN-65 < 8.6 06-Feb-20 ZR-NB-95 < 3.2 06-Feb-20 I-131 < 0.273 06-Feb-20 CS-134 < 4.1 06-Feb-20 CS-137 < 2.0 06-Feb-20 BA-LA-140 < 2.5 06-Feb-20 GROSS BETA 2.012 +/- 0.952 02-Mar-20 MN-54 < 3.7 02-Mar-20 MN-54 < 3.7 02-Mar-20 CO-58 < 1.7 02-Mar-20 CO-58 < 1.7 02-Mar-20 FE-59 < 3.5 02-Mar-20 FE-59 < 3.5 02-Mar-20 CO-60 < 3.5 02-Mar-20 CO-60 < 3.5 02-Mar-20 ZN-65 < 6.3 02-Mar-20 ZN-65 < 6.3 02-Mar-20 ZR-NB-95 < 5.1 02-Mar-20 ZR-NB-95 < 5.1 02-Mar-20 I-131 < 0.358 02-Mar-20 I-131 < 0.358 02-Mar-20 CS-134 < 4.2 02-Mar-20 CS-134 < 4.2 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 61

Exposure Pathway - Waterborne Drinking Water Location: BW-15 Nuclide Concentration Duplicate Collection (pCi/Liter) Analysis Date 02-Mar-20 CS-137 < 2.1 02-Mar-20 CS-137 < 2.1 02-Mar-20 BA-LA-140 < 4.3 02-Mar-20 BA-LA-140 < 4.3 02-Mar-20 GROSS BETA 2.065 +/- 0.65 06-Apr-20 MN-54 < 2.9 06-Apr-20 CO-58 < 3.3 06-Apr-20 FE-59 < 7.7 06-Apr-20 CO-60 < 3.2 06-Apr-20 ZN-65 < 7.1 06-Apr-20 ZR-NB-95 < 2.7 06-Apr-20 I-131 < 0.464 06-Apr-20 CS-134 < 4.4 06-Apr-20 CS-137 < 3.1 06-Apr-20 BA-LA-140 < 2.5 06-Apr-20 GROSS BETA 1.874 +/- 0.607 04-May-20 MN-54 < 3.7 04-May-20 CO-58 < 2.6 04-May-20 FE-59 < 4.6 04-May-20 CO-60 < 1.3 04-May-20 ZN-65 < 4.6 04-May-20 ZR-NB-95 < 2.3 04-May-20 I-131 < 0.283 04-May-20 CS-134 < 3.5 04-May-20 CS-137 < 3.4 04-May-20 BA-LA-140 < 3.9 04-May-20 GROSS BETA 1.637 +/- 0.597 01-Jun-20 MN-54 < 4.1 01-Jun-20 CO-58 < 2.1 01-Jun-20 FE-59 < 3.8 01-Jun-20 CO-60 < 2.1 01-Jun-20 ZN-65 < 2.2 01-Jun-20 ZR-NB-95 < 2.3 01-Jun-20 I-131 < 0.324 01-Jun-20 CS-134 < 3.6 01-Jun-20 CS-137 < 2.4 01-Jun-20 BA-LA-140 < 3.9 01-Jun-20 GROSS BETA 1.661 +/- 0.571 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 62

Exposure Pathway - Waterborne Drinking Water Location: BW-15 Nuclide Concentration Duplicate Collection (pCi/Liter) Analysis Date 08-Jul-20 MN-54 < 4.4 08-Jul-20 CO-58 < 3.2 08-Jul-20 FE-59 < 4.9 08-Jul-20 CO-60 < 1.9 08-Jul-20 ZN-65 < 4.5 08-Jul-20 ZR-NB-95 < 4.2 08-Jul-20 I-131 < 0.428 08-Jul-20 CS-134 < 3.6 08-Jul-20 CS-137 < 2.9 08-Jul-20 BA-LA-140 < 1.4 08-Jul-20 GROSS BETA 1.379 +/- 0.508 03-Aug-20 MN-54 < 2.4 03-Aug-20 CO-58 < 3.7 03-Aug-20 FE-59 < 4.7 03-Aug-20 CO-60 < 2.1 03-Aug-20 ZN-65 < 5.6 03-Aug-20 ZR-NB-95 < 3.7 03-Aug-20 I-131 < 0.351 03-Aug-20 CS-134 < 3.8 03-Aug-20 CS-137 < 2.7 03-Aug-20 BA-LA-140 < 2.7 03-Aug-20 GROSS BETA 2.125 +/- 0.618 08-Sep-20 MN-54 < 3.7 08-Sep-20 CO-58 < 3.5 08-Sep-20 FE-59 < 3.9 08-Sep-20 CO-60 < 3.3 08-Sep-20 ZN-65 < 9.9 08-Sep-20 ZR-NB-95 < 3.4 08-Sep-20 I-131 < 0.434 08-Sep-20 CS-134 < 4.7 08-Sep-20 CS-137 < 4.7 08-Sep-20 BA-LA-140 < 2.1 08-Sep-20 GROSS BETA 2.121 +/- 0.6 05-Oct-20 MN-54 < 2.8 05-Oct-20 CO-58 < 2.3 05-Oct-20 FE-59 < 6.0 05-Oct-20 CO-60 < 1.5 05-Oct-20 ZN-65 < 5.8 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 63

Exposure Pathway - Waterborne Drinking Water Location: BW-15 Nuclide Concentration Duplicate Collection (pCi/Liter) Analysis Date 05-Oct-20 ZR-NB-95 < 4.9 05-Oct-20 I-131 < 0.48 05-Oct-20 CS-134 < 4.6 05-Oct-20 CS-137 < 4.0 05-Oct-20 BA-LA-140 < 2.4 05-Oct-20 GROSS BETA 2.076 +/- 0.614 09-Nov-20 MN-54 < 3.8 09-Nov-20 CO-58 < 3.2 09-Nov-20 FE-59 < 7.5 09-Nov-20 CO-60 < 3.7 09-Nov-20 ZN-65 < 2.9 09-Nov-20 ZR-NB-95 < 2.6 09-Nov-20 I-131 < 0.337 09-Nov-20 CS-134 < 4.4 09-Nov-20 CS-137 < 5.8 09-Nov-20 BA-LA-140 < 2.0 09-Nov-20 GROSS BETA 1.924 +/- 0.597 01-Dec-20 MN-54 < 2.2 01-Dec-20 CO-58 < 2.9 01-Dec-20 FE-59 < 3.9 01-Dec-20 CO-60 < 1.7 01-Dec-20 ZN-65 < 6.7 01-Dec-20 ZR-NB-95 < 2.7 01-Dec-20 I-131 < 0.288 01-Dec-20 CS-134 < 3.8 01-Dec-20 CS-137 < 4.0 01-Dec-20 BA-LA-140 < 2.3 01-Dec-20 GROSS BETA 2.178 +/- 0.629 07-Jan-21 MN-54 < 2.4 07-Jan-21 CO-58 < 3.6 07-Jan-21 FE-59 < 9.7 07-Jan-21 CO-60 < 3.3 07-Jan-21 ZN-65 < 11.6 07-Jan-21 ZR-NB-95 < 2.8 07-Jan-21 I-131 < 0.397 07-Jan-21 CS-134 < 4.9 07-Jan-21 CS-137 < 3.4 07-Jan-21 BA-LA-140 < 2.5 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 64

Exposure Pathway - Waterborne Drinking Water Location: BW-15 Nuclide Concentration Duplicate Collection (pCi/Liter) Analysis Date 07-Jan-21 GROSS BETA 3.100 +/- 0.676 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 65

Exposure Pathway - Waterborne Drinking Water Location: IO-DW Nuclide Concentration Duplicate Collection (pCi/Liter) Analysis Date 07-Jan-20 MN-54 < 2.9 07-Jan-20 CO-58 < 3.0 07-Jan-20 FE-59 < 3.2 07-Jan-20 CO-60 < 2.1 07-Jan-20 ZN-65 < 5.3 07-Jan-20 ZR-NB-95 < 3.2 07-Jan-20 I-131 < 0.259 07-Jan-20 CS-134 < 3.3 07-Jan-20 CS-137 < 2.6 07-Jan-20 BA-LA-140 < 1.8 07-Jan-20 GROSS BETA 1.898 +/- 0.632 06-Feb-20 MN-54 < 4.3 06-Feb-20 CO-58 < 2.2 06-Feb-20 FE-59 < 6.2 06-Feb-20 CO-60 < 3.4 06-Feb-20 ZN-65 < 6.7 06-Feb-20 ZR-NB-95 < 3.5 06-Feb-20 I-131 < 0.263 06-Feb-20 CS-134 < 4.2 06-Feb-20 CS-137 < 5.2 06-Feb-20 BA-LA-140 < 4.2 06-Feb-20 GROSS BETA 2.685 +/- 1.08 02-Mar-20 MN-54 < 1.6 02-Mar-20 MN-54 < 1.6 02-Mar-20 CO-58 < 2.4 02-Mar-20 CO-58 < 2.4 02-Mar-20 FE-59 < 4.7 02-Mar-20 FE-59 < 4.7 02-Mar-20 CO-60 < 2.0 02-Mar-20 CO-60 < 2.0 02-Mar-20 ZN-65 < 7.8 02-Mar-20 ZN-65 < 7.8 02-Mar-20 ZR-NB-95 < 4.7 02-Mar-20 ZR-NB-95 < 4.7 02-Mar-20 I-131 < 0.369 02-Mar-20 I-131 < 0.369 02-Mar-20 CS-134 < 3.9 02-Mar-20 CS-134 < 3.9 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 66

Exposure Pathway - Waterborne Drinking Water Location: IO-DW Nuclide Concentration Duplicate Collection (pCi/Liter) Analysis Date 02-Mar-20 CS-137 < 2.7 02-Mar-20 CS-137 < 2.7 02-Mar-20 BA-LA-140 < 1.5 02-Mar-20 BA-LA-140 < 1.5 02-Mar-20 GROSS BETA 1.189 +/- 0.581 06-Apr-20 MN-54 < 3.1 06-Apr-20 CO-58 < 2.2 06-Apr-20 FE-59 < 3.6 06-Apr-20 CO-60 < 2.0 06-Apr-20 ZN-65 < 4.7 06-Apr-20 ZR-NB-95 < 2.4 06-Apr-20 I-131 < 0.229 06-Apr-20 CS-134 < 3.2 06-Apr-20 CS-137 < 3.2 06-Apr-20 BA-LA-140 < 2.1 06-Apr-20 GROSS BETA 1.807 +/- 0.602 04-May-20 MN-54 < 2.5 04-May-20 CO-58 < 1.3 04-May-20 FE-59 < 3.7 04-May-20 CO-60 < 1.8 04-May-20 ZN-65 < 2.4 04-May-20 ZR-NB-95 < 3.1 04-May-20 I-131 < 0.256 04-May-20 CS-134 < 3.3 04-May-20 CS-137 < 3.2 04-May-20 BA-LA-140 < 2.3 04-May-20 GROSS BETA 1.880 +/- 0.617 01-Jun-20 MN-54 < 2.8 01-Jun-20 CO-58 < 2.8 01-Jun-20 FE-59 < 5.1 01-Jun-20 CO-60 < 2.0 01-Jun-20 ZN-65 < 6.7 01-Jun-20 ZR-NB-95 < 3.9 01-Jun-20 I-131 < 0.328 01-Jun-20 CS-134 < 4.2 01-Jun-20 CS-137 < 4.2 01-Jun-20 BA-LA-140 < 4.3 01-Jun-20 GROSS BETA 2.527 +/- 0.651 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 67

Exposure Pathway - Waterborne Drinking Water Location: IO-DW Nuclide Concentration Duplicate Collection (pCi/Liter) Analysis Date 08-Jul-20 MN-54 < 3.2 08-Jul-20 CO-58 < 1.9 08-Jul-20 FE-59 < 4.2 08-Jul-20 CO-60 < 2.4 08-Jul-20 ZN-65 < 6.7 08-Jul-20 ZR-NB-95 < 2.7 08-Jul-20 I-131 < 0.472 08-Jul-20 CS-134 < 3.8 08-Jul-20 CS-137 < 4.2 08-Jul-20 BA-LA-140 < 4.0 08-Jul-20 GROSS BETA 2.852 +/- 0.69 03-Aug-20 MN-54 < 2.2 03-Aug-20 CO-58 < 1.6 03-Aug-20 FE-59 < 4.9 03-Aug-20 CO-60 < 2.1 03-Aug-20 ZN-65 < 4.5 03-Aug-20 ZR-NB-95 < 3.1 03-Aug-20 I-131 < 0.265 03-Aug-20 CS-134 < 2.9 03-Aug-20 CS-137 < 2.8 03-Aug-20 BA-LA-140 < 1.7 03-Aug-20 GROSS BETA 2.005 +/- 0.624 08-Sep-20 MN-54 < 2.0 08-Sep-20 CO-58 < 2.2 08-Sep-20 FE-59 < 2.0 08-Sep-20 CO-60 < 0.9 08-Sep-20 ZN-65 < 3.8 08-Sep-20 ZR-NB-95 < 1.8 08-Sep-20 I-131 < 0.404 08-Sep-20 CS-134 < 2.7 08-Sep-20 CS-137 < 2.9 08-Sep-20 BA-LA-140 < 1.4 08-Sep-20 GROSS BETA 2.611 +/- 0.657 05-Oct-20 MN-54 < 2.2 05-Oct-20 CO-58 < 2.9 05-Oct-20 FE-59 < 5.5 05-Oct-20 CO-60 < 1.1 05-Oct-20 ZN-65 < 5.3 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 68

Exposure Pathway - Waterborne Drinking Water Location: IO-DW Nuclide Concentration Duplicate Collection (pCi/Liter) Analysis Date 05-Oct-20 ZR-NB-95 < 2.5 05-Oct-20 I-131 < 0.231 05-Oct-20 CS-134 < 3.0 05-Oct-20 CS-137 < 3.6 05-Oct-20 BA-LA-140 < 3.7 05-Oct-20 GROSS BETA 2.631 +/- 0.662 09-Nov-20 MN-54 < 2.9 09-Nov-20 CO-58 < 5.5 09-Nov-20 FE-59 < 6.3 09-Nov-20 CO-60 < 2.5 09-Nov-20 ZN-65 < 4.8 09-Nov-20 ZR-NB-95 < 3.5 09-Nov-20 I-131 < 0.36 09-Nov-20 CS-134 < 4.8 09-Nov-20 CS-137 < 3.6 09-Nov-20 BA-LA-140 < 3.3 09-Nov-20 GROSS BETA 3.551 +/- 0.751 01-Dec-20 MN-54 < 3.0 01-Dec-20 CO-58 < 2.9 01-Dec-20 FE-59 < 5.2 01-Dec-20 CO-60 < 3.1 01-Dec-20 ZN-65 < 2.0 01-Dec-20 ZR-NB-95 < 3.2 01-Dec-20 I-131 < 0.296 01-Dec-20 CS-134 < 3.7 01-Dec-20 CS-137 < 3.1 01-Dec-20 BA-LA-140 < 3.2 01-Dec-20 GROSS BETA 3.287 +/- 0.729 07-Jan-21 MN-54 < 2.8 07-Jan-21 CO-58 < 2.5 07-Jan-21 FE-59 < 6.2 07-Jan-21 CO-60 < 3.1 07-Jan-21 ZN-65 < 5.2 07-Jan-21 ZR-NB-95 < 2.6 07-Jan-21 I-131 < 0.307 07-Jan-21 CS-134 < 3.9 07-Jan-21 CS-137 < 4.0 07-Jan-21 BA-LA-140 < 2.2 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 69

Exposure Pathway - Waterborne Drinking Water Location: IO-DW Nuclide Concentration Duplicate Collection (pCi/Liter) Analysis Date 07-Jan-21 GROSS BETA 2.680 +/- 0.684 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 70

Exposure Pathway - Waterborne Drinking Water Quarterly Tritium Analysis Location: BW-15 Collection Nuclide Concentration Duplicate Date (pCi/Liter) Analysis 07-Jan-20 H-3 < 157 06-Apr-20 H-3 < 158 08-Jul-20 H-3 < 160 05-Oct-20 H-3 < 158 07-Jan-21 H-3 < 165 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station Page C - 71

Exposure Pathway - Waterborne Shoreline Sediment Location: DC Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Dry) Analysis 27-May-20 SHORELINE SEDIMENT K-40 5,673.7 +/- 412.9 27-May-20 SHORELINE SEDIMENT MN-54 < 17.7 27-May-20 SHORELINE SEDIMENT CO-58 < 12.4 27-May-20 SHORELINE SEDIMENT FE-59 < 30.4 27-May-20 SHORELINE SEDIMENT CO-60 < 15.1 27-May-20 SHORELINE SEDIMENT ZN-65 < 30.0 27-May-20 SHORELINE SEDIMENT CS-134 < 13.2 27-May-20 SHORELINE SEDIMENT CS-137 < 11.9 15-Oct-20 SHORELINE SEDIMENT K-40 8,793.9 +/- 560.0 15-Oct-20 SHORELINE SEDIMENT MN-54 < 27.8 15-Oct-20 SHORELINE SEDIMENT CO-58 < 31.9 15-Oct-20 SHORELINE SEDIMENT FE-59 < 69.0 15-Oct-20 SHORELINE SEDIMENT CO-60 < 17.2 15-Oct-20 SHORELINE SEDIMENT ZN-65 < 70.4 15-Oct-20 SHORELINE SEDIMENT CS-134 < 24.2 15-Oct-20 SHORELINE SEDIMENT CS-137 < 30.2 2020 Annual Radiological Environmental Operating Report Page C - 72 Wolf Creek Generating Station

Exposure Pathway - Waterborne Shoreline Sediment Location: EEA Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Dry) Analysis 19-Jun-20 SHORELINE SEDIMENTS K-40 11,572.0 +/- 672.1 19-Jun-20 SHORELINE SEDIMENTS MN-54 < 24.2 19-Jun-20 SHORELINE SEDIMENTS CO-58 < 21.5 19-Jun-20 SHORELINE SEDIMENTS FE-59 < 55.2 19-Jun-20 SHORELINE SEDIMENTS CO-60 < 25.2 19-Jun-20 SHORELINE SEDIMENTS ZN-65 < 47.6 19-Jun-20 SHORELINE SEDIMENTS CS-134 < 19.3 19-Jun-20 SHORELINE SEDIMENTS CS-137 124.8 +/- 30.9 2020 Annual Radiological Environmental Operating Report Page C - 73 Wolf Creek Generating Station

Exposure Pathway - Waterborne Shoreline Sediment Location: JRR Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Dry) Analysis 23-Apr-20 SHORELINE SEDIMENTS K-40 8,156.8 +/- 505.3 Duplicate 23-Apr-20 SHORELINE SEDIMENTS K-40 7,826.5 +/- 491.6 23-Apr-20 SHORELINE SEDIMENTS MN-54 < 27.4 Duplicate 23-Apr-20 SHORELINE SEDIMENTS MN-54 < 25.8 23-Apr-20 SHORELINE SEDIMENTS CO-58 < 27.7 23-Apr-20 SHORELINE SEDIMENTS CO-58 < 30.7 Duplicate 23-Apr-20 SHORELINE SEDIMENTS FE-59 < 42.2 Duplicate 23-Apr-20 SHORELINE SEDIMENTS FE-59 < 46.5 23-Apr-20 SHORELINE SEDIMENTS CO-60 < 14.1 Duplicate 23-Apr-20 SHORELINE SEDIMENTS CO-60 < 25.0 23-Apr-20 SHORELINE SEDIMENTS ZN-65 < 56.2 23-Apr-20 SHORELINE SEDIMENTS ZN-65 < 49.6 Duplicate 23-Apr-20 SHORELINE SEDIMENTS CS-134 < 21.6 Duplicate 23-Apr-20 SHORELINE SEDIMENTS CS-134 < 22.2 23-Apr-20 SHORELINE SEDIMENTS CS-137 < 24.6 Duplicate 23-Apr-20 SHORELINE SEDIMENTS CS-137 < 22.8 15-Oct-20 SHORELINE SEDIMENT K-40 9,328.3 +/- 488.4 15-Oct-20 SHORELINE SEDIMENT K-40 10,867.0 +/- 655.7 Duplicate 15-Oct-20 SHORELINE SEDIMENT MN-54 < 33.1 Duplicate 15-Oct-20 SHORELINE SEDIMENT MN-54 < 25.1 15-Oct-20 SHORELINE SEDIMENT CO-58 < 41.1 Duplicate 15-Oct-20 SHORELINE SEDIMENT CO-58 < 24.5 15-Oct-20 SHORELINE SEDIMENT FE-59 < 68.7 Duplicate 15-Oct-20 SHORELINE SEDIMENT FE-59 < 95.6 15-Oct-20 SHORELINE SEDIMENT CO-60 < 18.3 15-Oct-20 SHORELINE SEDIMENT CO-60 < 17.4 Duplicate 15-Oct-20 SHORELINE SEDIMENT ZN-65 < 44.0 15-Oct-20 SHORELINE SEDIMENT ZN-65 < 74.4 Duplicate 15-Oct-20 SHORELINE SEDIMENT CS-134 < 15.8 15-Oct-20 SHORELINE SEDIMENT CS-134 < 17.8 Duplicate 15-Oct-20 SHORELINE SEDIMENT CS-137 < 31.2 Duplicate 15-Oct-20 SHORELINE SEDIMENT CS-137 < 21.5 2020 Annual Radiological Environmental Operating Report Page C - 74 Wolf Creek Generating Station

Exposure Pathway - Waterborne Shoreline Sediment Location: SC Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Dry) Analysis 19-Jun-20 SHORELINE SEDIMENTS K-40 12,593.0 +/- 582.9 19-Jun-20 SHORELINE SEDIMENTS MN-54 < 25.0 19-Jun-20 SHORELINE SEDIMENTS CO-58 < 24.2 19-Jun-20 SHORELINE SEDIMENTS FE-59 < 45.1 19-Jun-20 SHORELINE SEDIMENTS CO-60 < 17.2 19-Jun-20 SHORELINE SEDIMENTS ZN-65 < 37.2 19-Jun-20 SHORELINE SEDIMENTS CS-134 < 14.8 19-Jun-20 SHORELINE SEDIMENTS CS-137 43.3 +/- 21.2 23-Sep-20 SHORELINE SEDIMENTS K-40 10,100.0 +/- 708.4 23-Sep-20 SHORELINE SEDIMENTS K-40 8,782.7 +/- 520.5 Duplicate 23-Sep-20 SHORELINE SEDIMENTS MN-54 < 32.8 23-Sep-20 SHORELINE SEDIMENTS MN-54 < 22.0 Duplicate 23-Sep-20 SHORELINE SEDIMENTS CO-58 < 27.1 Duplicate 23-Sep-20 SHORELINE SEDIMENTS CO-58 < 34.5 23-Sep-20 SHORELINE SEDIMENTS FE-59 < 120.3 23-Sep-20 SHORELINE SEDIMENTS FE-59 < 81.5 Duplicate 23-Sep-20 SHORELINE SEDIMENTS CO-60 < 19.7 Duplicate 23-Sep-20 SHORELINE SEDIMENTS CO-60 < 14.2 23-Sep-20 SHORELINE SEDIMENTS ZN-65 < 40.7 Duplicate 23-Sep-20 SHORELINE SEDIMENTS ZN-65 < 65.4 23-Sep-20 SHORELINE SEDIMENTS CS-134 < 16.7 Duplicate 23-Sep-20 SHORELINE SEDIMENTS CS-134 < 29.0 23-Sep-20 SHORELINE SEDIMENTS CS-137 < 19.6 Duplicate 23-Sep-20 SHORELINE SEDIMENTS CS-137 < 30.5 2020 Annual Radiological Environmental Operating Report Page C - 75 Wolf Creek Generating Station

Exposure Pathway - Ingestion Fish Location: CCL Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 17-Mar-20 CHANNEL CATFISH K-40 4,239.8 +/- 513.9 17-Mar-20 CHANNEL CATFISH MN-54 < 19.1 17-Mar-20 CHANNEL CATFISH CO-58 < 18.8 17-Mar-20 CHANNEL CATFISH FE-59 < 28.9 17-Mar-20 CHANNEL CATFISH CO-60 < 13.9 17-Mar-20 CHANNEL CATFISH ZN-65 < 33.7 17-Mar-20 CHANNEL CATFISH I-131 < 25.5 17-Mar-20 CHANNEL CATFISH CS-134 < 16.9 17-Mar-20 CHANNEL CATFISH CS-137 < 17.3 17-Mar-20 CHANNEL CATFISH H-3 11,171.0 +/- 287.0 17-Mar-20 COMMON CARP K-40 4,461.7 +/- 609.5 17-Mar-20 COMMON CARP MN-54 < 20.8 17-Mar-20 COMMON CARP CO-58 < 19.2 17-Mar-20 COMMON CARP FE-59 < 59.8 17-Mar-20 COMMON CARP CO-60 < 12.1 17-Mar-20 COMMON CARP ZN-65 < 39.2 17-Mar-20 COMMON CARP I-131 < 22.2 17-Mar-20 COMMON CARP CS-134 < 24.3 17-Mar-20 COMMON CARP CS-137 < 17.1 17-Mar-20 COMMON CARP H-3 12,561.0 +/- 304.0 17-Mar-20 FRESHWATER DRUM K-40 3,816.2 +/- 538.1 17-Mar-20 FRESHWATER DRUM MN-54 < 31.1 17-Mar-20 FRESHWATER DRUM CO-58 < 21.4 17-Mar-20 FRESHWATER DRUM FE-59 < 40.9 17-Mar-20 FRESHWATER DRUM CO-60 < 9.7 17-Mar-20 FRESHWATER DRUM ZN-65 < 50.9 17-Mar-20 FRESHWATER DRUM I-131 < 33.4 17-Mar-20 FRESHWATER DRUM CS-134 < 23.0 17-Mar-20 FRESHWATER DRUM CS-137 < 14.7 17-Mar-20 FRESHWATER DRUM H-3 9,689.0 +/- 269.0 17-Mar-20 SMALLMOUTH BUFFALO K-40 3,949.4 +/- 589.9 Duplicate 17-Mar-20 SMALLMOUTH BUFFALO K-40 4,971.1 +/- 589.1 17-Mar-20 SMALLMOUTH BUFFALO MN-54 < 25.4 Duplicate 17-Mar-20 SMALLMOUTH BUFFALO MN-54 < 15.7 17-Mar-20 SMALLMOUTH BUFFALO CO-58 < 22.9 Duplicate 17-Mar-20 SMALLMOUTH BUFFALO CO-58 < 10.2 17-Mar-20 SMALLMOUTH BUFFALO FE-59 < 59.3 Duplicate 17-Mar-20 SMALLMOUTH BUFFALO FE-59 < 41.1 2020 Annual Radiological Environmental Operating Report Page C - 76 Wolf Creek Generating Station

Exposure Pathway - Ingestion Fish Location: CCL Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 17-Mar-20 SMALLMOUTH BUFFALO CO-60 < 24.0 Duplicate 17-Mar-20 SMALLMOUTH BUFFALO CO-60 < 12.3 17-Mar-20 SMALLMOUTH BUFFALO ZN-65 < 30.1 17-Mar-20 SMALLMOUTH BUFFALO ZN-65 < 52.2 Duplicate 17-Mar-20 SMALLMOUTH BUFFALO I-131 < 37.1 17-Mar-20 SMALLMOUTH BUFFALO I-131 < 23.7 Duplicate 17-Mar-20 SMALLMOUTH BUFFALO CS-134 < 25.2 Duplicate 17-Mar-20 SMALLMOUTH BUFFALO CS-134 < 23.4 17-Mar-20 SMALLMOUTH BUFFALO CS-137 < 21.4 Duplicate 17-Mar-20 SMALLMOUTH BUFFALO CS-137 < 15.4 17-Mar-20 SMALLMOUTH BUFFALO H-3 10,449.0 +/- 276.0 Duplicate 17-Mar-20 SMALLMOUTH BUFFALO H-3 10,758.0 +/- 279.0 17-Mar-20 WHITE BASS K-40 4,202.2 +/- 531.7 17-Mar-20 WHITE BASS MN-54 < 14.3 17-Mar-20 WHITE BASS CO-58 < 23.9 17-Mar-20 WHITE BASS FE-59 < 33.7 17-Mar-20 WHITE BASS CO-60 < 15.2 17-Mar-20 WHITE BASS ZN-65 < 30.1 17-Mar-20 WHITE BASS I-131 < 30.6 17-Mar-20 WHITE BASS CS-134 < 21.8 17-Mar-20 WHITE BASS CS-137 < 23.5 17-Mar-20 WHITE BASS H-3 10,200.0 +/- 272.0 17-Mar-20 WHITE CRAPPIE K-40 4,444.2 +/- 1,074.0 17-Mar-20 WHITE CRAPPIE MN-54 < 34.5 17-Mar-20 WHITE CRAPPIE CO-58 < 38.3 17-Mar-20 WHITE CRAPPIE FE-59 < 100.6 17-Mar-20 WHITE CRAPPIE CO-60 < 46.0 17-Mar-20 WHITE CRAPPIE ZN-65 < 136.5 17-Mar-20 WHITE CRAPPIE I-131 < 87.9 17-Mar-20 WHITE CRAPPIE CS-134 < 42.4 17-Mar-20 WHITE CRAPPIE CS-137 < 39.3 17-Mar-20 WHITE CRAPPIE H-3 9,205.0 +/- 260.0 03-Nov-20 BLUE CATFISH K-40 3,332.7 +/- 453.4 03-Nov-20 BLUE CATFISH MN-54 < 15.7 03-Nov-20 BLUE CATFISH CO-58 < 20.0 03-Nov-20 BLUE CATFISH FE-59 < 56.8 03-Nov-20 BLUE CATFISH CO-60 < 14.2 03-Nov-20 BLUE CATFISH ZN-65 < 32.2 2020 Annual Radiological Environmental Operating Report Page C - 77 Wolf Creek Generating Station

Exposure Pathway - Ingestion Fish Location: CCL Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 03-Nov-20 BLUE CATFISH I-131 < 72.2 03-Nov-20 BLUE CATFISH CS-134 < 18.7 03-Nov-20 BLUE CATFISH CS-137 < 20.0 03-Nov-20 BLUE CATFISH H-3 7,782.0 +/- 241.0 03-Nov-20 CHANNEL CATFISH K-40 3,479.6 +/- 396.2 03-Nov-20 CHANNEL CATFISH MN-54 < 17.2 03-Nov-20 CHANNEL CATFISH CO-58 < 18.5 03-Nov-20 CHANNEL CATFISH FE-59 < 30.7 03-Nov-20 CHANNEL CATFISH CO-60 < 15.1 03-Nov-20 CHANNEL CATFISH ZN-65 < 25.8 03-Nov-20 CHANNEL CATFISH I-131 < 89.2 03-Nov-20 CHANNEL CATFISH CS-134 < 16.0 03-Nov-20 CHANNEL CATFISH CS-137 < 19.0 03-Nov-20 CHANNEL CATFISH H-3 6,907.0 +/- 231.0 03-Nov-20 COMMON CARP K-40 3,476.1 +/- 367.3 03-Nov-20 COMMON CARP MN-54 < 20.6 03-Nov-20 COMMON CARP CO-58 < 23.7 03-Nov-20 COMMON CARP FE-59 < 29.8 03-Nov-20 COMMON CARP CO-60 < 16.3 03-Nov-20 COMMON CARP ZN-65 < 46.4 03-Nov-20 COMMON CARP I-131 < 80.1 03-Nov-20 COMMON CARP CS-134 < 16.9 03-Nov-20 COMMON CARP CS-137 < 19.3 03-Nov-20 COMMON CARP H-3 8,371.0 +/- 249.0 03-Nov-20 CRAPPIE K-40 3,832.7 +/- 235.4 03-Nov-20 CRAPPIE MN-54 < 14.4 03-Nov-20 CRAPPIE CO-58 < 7.6 03-Nov-20 CRAPPIE FE-59 < 22.6 03-Nov-20 CRAPPIE CO-60 < 12.3 03-Nov-20 CRAPPIE ZN-65 < 29.5 03-Nov-20 CRAPPIE I-131 < 51.9 03-Nov-20 CRAPPIE CS-134 < 11.8 03-Nov-20 CRAPPIE CS-137 < 12.8 03-Nov-20 CRAPPIE H-3 7,861.0 +/- 243.0 03-Nov-20 FISH K-40 3,706.6 +/- 397.7 Duplicate 03-Nov-20 FISH MN-54 < 10.9 Duplicate 03-Nov-20 FISH CO-58 < 17.0 Duplicate 03-Nov-20 FISH FE-59 < 41.8 Duplicate 2020 Annual Radiological Environmental Operating Report Page C - 78 Wolf Creek Generating Station

Exposure Pathway - Ingestion Fish Location: CCL Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 03-Nov-20 FISH CO-60 < 14.8 Duplicate 03-Nov-20 FISH ZN-65 < 28.9 Duplicate 03-Nov-20 FISH I-131 < 118.6 Duplicate 03-Nov-20 FISH CS-134 < 17.3 Duplicate 03-Nov-20 FISH CS-137 < 15.0 Duplicate 03-Nov-20 FISH H-3 8,034.0 +/- 247.0 Duplicate 03-Nov-20 SMALLMOUTH BUFFALO K-40 3,303.6 +/- 464.4 03-Nov-20 SMALLMOUTH BUFFALO MN-54 < 18.6 03-Nov-20 SMALLMOUTH BUFFALO CO-58 < 25.4 03-Nov-20 SMALLMOUTH BUFFALO FE-59 < 48.7 03-Nov-20 SMALLMOUTH BUFFALO CO-60 < 14.6 03-Nov-20 SMALLMOUTH BUFFALO ZN-65 < 31.4 03-Nov-20 SMALLMOUTH BUFFALO I-131 < 94.0 03-Nov-20 SMALLMOUTH BUFFALO CS-134 < 21.5 03-Nov-20 SMALLMOUTH BUFFALO CS-137 < 17.5 03-Nov-20 SMALLMOUTH BUFFALO H-3 7,996.0 +/- 249.0 03-Nov-20 WALLEY K-40 4,135.1 +/- 398.2 03-Nov-20 WALLEY MN-54 < 17.9 03-Nov-20 WALLEY CO-58 < 12.8 03-Nov-20 WALLEY FE-59 < 47.1 03-Nov-20 WALLEY CO-60 < 11.1 03-Nov-20 WALLEY ZN-65 < 41.2 03-Nov-20 WALLEY I-131 < 98.3 03-Nov-20 WALLEY CS-134 < 16.0 03-Nov-20 WALLEY CS-137 < 19.7 03-Nov-20 WALLEY H-3 8,052.0 +/- 245.0 03-Nov-20 WHITE BASS K-40 3,572.6 +/- 346.4 03-Nov-20 WHITE BASS MN-54 < 16.8 03-Nov-20 WHITE BASS CO-58 < 13.0 03-Nov-20 WHITE BASS FE-59 < 45.3 03-Nov-20 WHITE BASS CO-60 < 20.3 03-Nov-20 WHITE BASS ZN-65 < 23.2 03-Nov-20 WHITE BASS I-131 < 88.1 03-Nov-20 WHITE BASS CS-134 < 19.5 03-Nov-20 WHITE BASS CS-137 < 18.8 03-Nov-20 WHITE BASS H-3 7,878.0 +/- 245.0 2020 Annual Radiological Environmental Operating Report Page C - 79 Wolf Creek Generating Station

Exposure Pathway - Ingestion Fish Location: JRR Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 23-Apr-20 BLACK CRAPPIE K-40 5,196.4 +/- 646.6 23-Apr-20 BLACK CRAPPIE MN-54 < 33.1 23-Apr-20 BLACK CRAPPIE CO-58 < 20.5 23-Apr-20 BLACK CRAPPIE FE-59 < 44.0 23-Apr-20 BLACK CRAPPIE CO-60 < 22.2 23-Apr-20 BLACK CRAPPIE ZN-65 < 71.8 23-Apr-20 BLACK CRAPPIE I-131 < 35.0 23-Apr-20 BLACK CRAPPIE CS-134 < 25.6 23-Apr-20 BLACK CRAPPIE CS-137 < 19.4 23-Apr-20 BLACK CRAPPIE H-3 < 123.0 23-Apr-20 CHANNEL CATFISH K-40 4,067.8 +/- 507.9 23-Apr-20 CHANNEL CATFISH MN-54 < 16.7 23-Apr-20 CHANNEL CATFISH CO-58 < 13.8 23-Apr-20 CHANNEL CATFISH FE-59 < 49.1 23-Apr-20 CHANNEL CATFISH CO-60 < 18.1 23-Apr-20 CHANNEL CATFISH ZN-65 < 25.9 23-Apr-20 CHANNEL CATFISH I-131 < 35.1 23-Apr-20 CHANNEL CATFISH CS-134 < 19.1 23-Apr-20 CHANNEL CATFISH CS-137 < 20.7 23-Apr-20 CHANNEL CATFISH H-3 < 124.0 23-Apr-20 COMMON CARP K-40 4,613.4 +/- 550.2 23-Apr-20 COMMON CARP MN-54 < 17.0 23-Apr-20 COMMON CARP CO-58 < 18.9 23-Apr-20 COMMON CARP FE-59 < 46.2 23-Apr-20 COMMON CARP CO-60 < 24.5 23-Apr-20 COMMON CARP ZN-65 < 61.1 23-Apr-20 COMMON CARP I-131 < 23.7 23-Apr-20 COMMON CARP CS-134 < 23.6 23-Apr-20 COMMON CARP CS-137 < 17.6 23-Apr-20 COMMON CARP H-3 < 124.0 23-Apr-20 DRUM K-40 4,684.2 +/- 534.0 23-Apr-20 DRUM MN-54 < 14.2 23-Apr-20 DRUM CO-58 < 13.0 23-Apr-20 DRUM FE-59 < 55.1 23-Apr-20 DRUM CO-60 < 15.6 23-Apr-20 DRUM ZN-65 < 21.4 23-Apr-20 DRUM I-131 < 21.1 23-Apr-20 DRUM CS-134 < 20.7 2020 Annual Radiological Environmental Operating Report Page C - 80 Wolf Creek Generating Station

Exposure Pathway - Ingestion Fish Location: JRR Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 23-Apr-20 DRUM CS-137 < 19.2 23-Apr-20 DRUM H-3 < 124.0 23-Apr-20 LARGEMOUTH BASS K-40 4,552.1 +/- 522.2 23-Apr-20 LARGEMOUTH BASS MN-54 < 14.7 23-Apr-20 LARGEMOUTH BASS CO-58 < 12.1 23-Apr-20 LARGEMOUTH BASS FE-59 < 44.8 23-Apr-20 LARGEMOUTH BASS CO-60 < 17.4 23-Apr-20 LARGEMOUTH BASS ZN-65 < 43.4 23-Apr-20 LARGEMOUTH BASS I-131 < 28.7 23-Apr-20 LARGEMOUTH BASS CS-134 < 19.5 23-Apr-20 LARGEMOUTH BASS CS-137 < 16.2 23-Apr-20 LARGEMOUTH BASS H-3 < 120.0 23-Apr-20 SMALLMOUTH BUFFALO K-40 3,849.6 +/- 509.8 23-Apr-20 SMALLMOUTH BUFFALO MN-54 < 13.6 23-Apr-20 SMALLMOUTH BUFFALO CO-58 < 18.9 23-Apr-20 SMALLMOUTH BUFFALO FE-59 < 39.1 23-Apr-20 SMALLMOUTH BUFFALO CO-60 < 15.5 23-Apr-20 SMALLMOUTH BUFFALO ZN-65 < 44.0 23-Apr-20 SMALLMOUTH BUFFALO I-131 < 34.3 23-Apr-20 SMALLMOUTH BUFFALO CS-134 < 16.1 23-Apr-20 SMALLMOUTH BUFFALO CS-137 < 23.1 23-Apr-20 SMALLMOUTH BUFFALO H-3 < 118.0 23-Apr-20 WHITE CRAPPIE K-40 3,776.1 +/- 542.1 23-Apr-20 WHITE CRAPPIE MN-54 < 23.0 23-Apr-20 WHITE CRAPPIE CO-58 < 13.0 23-Apr-20 WHITE CRAPPIE FE-59 < 54.4 23-Apr-20 WHITE CRAPPIE CO-60 < 8.5 23-Apr-20 WHITE CRAPPIE ZN-65 < 51.0 23-Apr-20 WHITE CRAPPIE I-131 < 36.3 23-Apr-20 WHITE CRAPPIE CS-134 < 24.9 23-Apr-20 WHITE CRAPPIE CS-137 < 20.6 23-Apr-20 WHITE CRAPPIE H-3 < 121.0 06-Nov-20 COMMON CARP K-40 3,608.6 +/- 485.1 06-Nov-20 COMMON CARP MN-54 < 17.4 06-Nov-20 COMMON CARP CO-58 < 24.4 06-Nov-20 COMMON CARP FE-59 < 26.0 06-Nov-20 COMMON CARP CO-60 < 9.6 06-Nov-20 COMMON CARP ZN-65 < 26.4 2020 Annual Radiological Environmental Operating Report Page C - 81 Wolf Creek Generating Station

Exposure Pathway - Ingestion Fish Location: JRR Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 06-Nov-20 COMMON CARP I-131 < 85.2 06-Nov-20 COMMON CARP CS-134 < 20.3 06-Nov-20 COMMON CARP CS-137 < 22.2 06-Nov-20 COMMON CARP H-3 < 125.0 06-Nov-20 CRAPPIE K-40 3,686.9 +/- 483.6 06-Nov-20 CRAPPIE MN-54 < 17.0 06-Nov-20 CRAPPIE CO-58 < 24.6 06-Nov-20 CRAPPIE FE-59 < 32.6 06-Nov-20 CRAPPIE CO-60 < 19.2 06-Nov-20 CRAPPIE ZN-65 < 31.7 06-Nov-20 CRAPPIE I-131 < 69.2 06-Nov-20 CRAPPIE CS-134 < 20.6 06-Nov-20 CRAPPIE CS-137 < 22.1 06-Nov-20 CRAPPIE H-3 < 123.0 06-Nov-20 WHITE BASS K-40 3,291.4 +/- 418.9 06-Nov-20 WHITE BASS MN-54 < 14.2 06-Nov-20 WHITE BASS CO-58 < 23.5 06-Nov-20 WHITE BASS FE-59 < 29.0 06-Nov-20 WHITE BASS CO-60 < 16.2 06-Nov-20 WHITE BASS ZN-65 < 21.1 06-Nov-20 WHITE BASS I-131 < 98.1 06-Nov-20 WHITE BASS CS-134 < 18.3 06-Nov-20 WHITE BASS CS-137 < 15.3 06-Nov-20 WHITE BASS H-3 < 121.0 2020 Annual Radiological Environmental Operating Report Page C - 82 Wolf Creek Generating Station

Exposure Pathway - Ingestion Food/Garden Location: A-3 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 23-Jun-20 HORSERADISH LEAVES BE-7 440.5 +/- 263.5 23-Jun-20 HORSERADISH LEAVES K-40 5,476.4 +/- 722.6 23-Jun-20 HORSERADISH LEAVES MN-54 < 17.3 23-Jun-20 HORSERADISH LEAVES CO-58 < 21.0 23-Jun-20 HORSERADISH LEAVES FE-59 < 43.6 23-Jun-20 HORSERADISH LEAVES CO-60 < 20.3 23-Jun-20 HORSERADISH LEAVES ZN-65 < 40.8 23-Jun-20 HORSERADISH LEAVES ZR-NB-95 < 23.1 23-Jun-20 HORSERADISH LEAVES I-131 < 31.9 23-Jun-20 HORSERADISH LEAVES CS-134 < 24.4 23-Jun-20 HORSERADISH LEAVES CS-137 < 22.4 28-Jul-20 HORSERADISH LEAVES BE-7 997.5 +/- 124.9 28-Jul-20 HORSERADISH LEAVES K-40 7,864.0 +/- 290.1 28-Jul-20 HORSERADISH LEAVES MN-54 < 12.6 28-Jul-20 HORSERADISH LEAVES CO-58 < 10.7 28-Jul-20 HORSERADISH LEAVES FE-59 < 13.5 28-Jul-20 HORSERADISH LEAVES CO-60 < 11.4 28-Jul-20 HORSERADISH LEAVES ZN-65 < 25.7 28-Jul-20 HORSERADISH LEAVES ZR-NB-95 < 12.6 28-Jul-20 HORSERADISH LEAVES I-131 < 26.8 28-Jul-20 HORSERADISH LEAVES CS-134 < 9.6 28-Jul-20 HORSERADISH LEAVES CS-137 < 8.4 17-Aug-20 HORSERADISH LEAVES BE-7 2,277.3 +/- 448.3 17-Aug-20 HORSERADISH LEAVES K-40 9,460.1 +/- 870.5 17-Aug-20 HORSERADISH LEAVES MN-54 < 16.8 17-Aug-20 HORSERADISH LEAVES CO-58 < 19.9 17-Aug-20 HORSERADISH LEAVES FE-59 < 44.8 17-Aug-20 HORSERADISH LEAVES CO-60 < 16.0 17-Aug-20 HORSERADISH LEAVES ZN-65 < 42.9 17-Aug-20 HORSERADISH LEAVES ZR-NB-95 < 34.8 17-Aug-20 HORSERADISH LEAVES I-131 < 39.9 17-Aug-20 HORSERADISH LEAVES CS-134 < 36.0 17-Aug-20 HORSERADISH LEAVES CS-137 < 22.7 12-Oct-20 HORSERADISH LEAVES BE-7 815.1 +/- 322.7 12-Oct-20 HORSERADISH LEAVES K-40 8,697.7 +/- 798.5 12-Oct-20 HORSERADISH LEAVES MN-54 < 26.9 12-Oct-20 HORSERADISH LEAVES CO-58 < 28.2 12-Oct-20 HORSERADISH LEAVES FE-59 < 64.6 2020 Annual Radiological Environmental Operating Report Page C - 83 Wolf Creek Generating Station

Exposure Pathway - Ingestion Food/Garden Location: A-3 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 12-Oct-20 HORSERADISH LEAVES CO-60 < 22.2 12-Oct-20 HORSERADISH LEAVES ZN-65 < 35.5 12-Oct-20 HORSERADISH LEAVES ZR-NB-95 < 18.7 12-Oct-20 HORSERADISH LEAVES I-131 < 53.0 12-Oct-20 HORSERADISH LEAVES CS-134 < 28.8 12-Oct-20 HORSERADISH LEAVES CS-137 < 26.5 2020 Annual Radiological Environmental Operating Report Page C - 84 Wolf Creek Generating Station

Exposure Pathway - Ingestion Food/Garden Location: B-1 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 18-May-20 HORSERADISH LEAVES BE-7 1,350.7 +/- 240.0 18-May-20 HORSERADISH LEAVES K-40 2,984.8 +/- 398.3 18-May-20 HORSERADISH LEAVES MN-54 < 14.0 18-May-20 HORSERADISH LEAVES CO-58 < 8.6 18-May-20 HORSERADISH LEAVES FE-59 < 30.7 18-May-20 HORSERADISH LEAVES CO-60 < 13.4 18-May-20 HORSERADISH LEAVES ZN-65 < 42.2 18-May-20 HORSERADISH LEAVES ZR-NB-95 < 11.9 18-May-20 HORSERADISH LEAVES I-131 < 13.5 18-May-20 HORSERADISH LEAVES CS-134 < 16.7 18-May-20 HORSERADISH LEAVES CS-137 < 19.3 23-Jun-20 HORSERADISH LEAVES BE-7 1,137.2 +/- 363.2 23-Jun-20 HORSERADISH LEAVES K-40 6,628.3 +/- 909.0 23-Jun-20 HORSERADISH LEAVES MN-54 < 36.6 23-Jun-20 HORSERADISH LEAVES CO-58 < 21.3 23-Jun-20 HORSERADISH LEAVES FE-59 < 47.7 23-Jun-20 HORSERADISH LEAVES CO-60 < 19.3 23-Jun-20 HORSERADISH LEAVES ZN-65 < 55.6 23-Jun-20 HORSERADISH LEAVES ZR-NB-95 < 24.5 23-Jun-20 HORSERADISH LEAVES I-131 < 20.6 23-Jun-20 HORSERADISH LEAVES CS-134 < 34.1 23-Jun-20 HORSERADISH LEAVES CS-137 < 28.1 28-Jul-20 HORSERADISH LEAVES BE-7 1,148.7 +/- 149.2 28-Jul-20 HORSERADISH LEAVES K-40 5,206.9 +/- 290.1 28-Jul-20 HORSERADISH LEAVES MN-54 < 11.5 28-Jul-20 HORSERADISH LEAVES CO-58 < 5.8 28-Jul-20 HORSERADISH LEAVES FE-59 < 24.2 28-Jul-20 HORSERADISH LEAVES CO-60 < 9.6 28-Jul-20 HORSERADISH LEAVES ZN-65 < 23.7 28-Jul-20 HORSERADISH LEAVES ZR-NB-95 < 12.1 28-Jul-20 HORSERADISH LEAVES I-131 < 38.0 28-Jul-20 HORSERADISH LEAVES CS-134 < 9.9 28-Jul-20 HORSERADISH LEAVES CS-137 < 11.7 17-Aug-20 HORSERADISH LEAVES BE-7 1,544.6 +/- 313.0 17-Aug-20 HORSERADISH LEAVES K-40 7,629.3 +/- 762.1 17-Aug-20 HORSERADISH LEAVES MN-54 < 21.7 17-Aug-20 HORSERADISH LEAVES CO-58 < 23.6 17-Aug-20 HORSERADISH LEAVES FE-59 < 56.7 2020 Annual Radiological Environmental Operating Report Page C - 85 Wolf Creek Generating Station

Exposure Pathway - Ingestion Food/Garden Location: B-1 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 17-Aug-20 HORSERADISH LEAVES CO-60 < 26.2 17-Aug-20 HORSERADISH LEAVES ZN-65 < 75.4 17-Aug-20 HORSERADISH LEAVES ZR-NB-95 < 31.5 17-Aug-20 HORSERADISH LEAVES I-131 < 23.0 17-Aug-20 HORSERADISH LEAVES CS-134 < 24.7 17-Aug-20 HORSERADISH LEAVES CS-137 < 17.0 08-Sep-20 HORSERADISH LEAVES BE-7 1,331.1 +/- 306.0 08-Sep-20 HORSERADISH LEAVES K-40 6,046.1 +/- 669.0 08-Sep-20 HORSERADISH LEAVES MN-54 < 15.2 08-Sep-20 HORSERADISH LEAVES CO-58 < 12.2 08-Sep-20 HORSERADISH LEAVES FE-59 < 53.8 08-Sep-20 HORSERADISH LEAVES CO-60 < 14.5 08-Sep-20 HORSERADISH LEAVES ZN-65 < 42.3 08-Sep-20 HORSERADISH LEAVES ZR-NB-95 < 21.1 08-Sep-20 HORSERADISH LEAVES I-131 < 56.2 08-Sep-20 HORSERADISH LEAVES CS-134 < 24.4 08-Sep-20 HORSERADISH LEAVES CS-137 < 19.5 12-Oct-20 HORSERADISH LEAVES BE-7 441.2 +/- 124.2 12-Oct-20 HORSERADISH LEAVES K-40 6,393.6 +/- 287.0 12-Oct-20 HORSERADISH LEAVES MN-54 < 12.9 12-Oct-20 HORSERADISH LEAVES CO-58 < 10.8 12-Oct-20 HORSERADISH LEAVES FE-59 < 24.0 12-Oct-20 HORSERADISH LEAVES CO-60 < 12.4 12-Oct-20 HORSERADISH LEAVES ZN-65 < 20.5 12-Oct-20 HORSERADISH LEAVES ZR-NB-95 < 9.9 12-Oct-20 HORSERADISH LEAVES I-131 < 17.2 12-Oct-20 HORSERADISH LEAVES CS-134 < 11.1 12-Oct-20 HORSERADISH LEAVES CS-137 < 8.4 2020 Annual Radiological Environmental Operating Report Page C - 86 Wolf Creek Generating Station

Exposure Pathway - Ingestion Food/Garden Location: D-2 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 23-Jun-20 HORSERADISH LEAVES BE-7 613.7 +/- 248.0 23-Jun-20 HORSERADISH LEAVES K-40 6,390.8 +/- 668.8 23-Jun-20 HORSERADISH LEAVES MN-54 < 15.1 23-Jun-20 HORSERADISH LEAVES CO-58 < 15.4 23-Jun-20 HORSERADISH LEAVES FE-59 < 32.8 23-Jun-20 HORSERADISH LEAVES CO-60 < 12.2 23-Jun-20 HORSERADISH LEAVES ZN-65 < 41.2 23-Jun-20 HORSERADISH LEAVES ZR-NB-95 < 19.7 23-Jun-20 HORSERADISH LEAVES I-131 < 21.2 23-Jun-20 HORSERADISH LEAVES CS-134 < 22.8 23-Jun-20 HORSERADISH LEAVES CS-137 < 16.8 28-Jul-20 HORSERADISH LEAVES BE-7 851.3 +/- 222.7 28-Jul-20 HORSERADISH LEAVES K-40 5,883.3 +/- 406.4 28-Jul-20 HORSERADISH LEAVES MN-54 < 14.1 28-Jul-20 HORSERADISH LEAVES CO-58 < 14.0 28-Jul-20 HORSERADISH LEAVES FE-59 < 20.1 28-Jul-20 HORSERADISH LEAVES CO-60 < 11.5 28-Jul-20 HORSERADISH LEAVES ZN-65 < 20.3 28-Jul-20 HORSERADISH LEAVES ZR-NB-95 < 15.3 28-Jul-20 HORSERADISH LEAVES I-131 < 44.4 28-Jul-20 HORSERADISH LEAVES CS-134 < 14.4 28-Jul-20 HORSERADISH LEAVES CS-137 < 14.8 17-Aug-20 HORSERADISH LEAVES BE-7 1,379.3 +/- 318.9 17-Aug-20 HORSERADISH LEAVES K-40 7,443.6 +/- 731.7 17-Aug-20 HORSERADISH LEAVES MN-54 < 21.5 17-Aug-20 HORSERADISH LEAVES CO-58 < 24.7 17-Aug-20 HORSERADISH LEAVES FE-59 < 38.3 17-Aug-20 HORSERADISH LEAVES CO-60 < 18.3 17-Aug-20 HORSERADISH LEAVES ZN-65 < 63.1 17-Aug-20 HORSERADISH LEAVES ZR-NB-95 < 22.5 17-Aug-20 HORSERADISH LEAVES I-131 < 30.0 17-Aug-20 HORSERADISH LEAVES CS-134 < 27.5 17-Aug-20 HORSERADISH LEAVES CS-137 < 11.8 08-Sep-20 HORSERADISH LEAVES BE-7 1,746.9 +/- 249.7 08-Sep-20 HORSERADISH LEAVES K-40 10,478.0 +/- 558.0 08-Sep-20 HORSERADISH LEAVES MN-54 < 15.9 08-Sep-20 HORSERADISH LEAVES CO-58 < 13.1 08-Sep-20 HORSERADISH LEAVES FE-59 < 42.9 2020 Annual Radiological Environmental Operating Report Page C - 87 Wolf Creek Generating Station

Exposure Pathway - Ingestion Food/Garden Location: D-2 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 08-Sep-20 HORSERADISH LEAVES CO-60 < 19.6 08-Sep-20 HORSERADISH LEAVES ZN-65 < 35.1 08-Sep-20 HORSERADISH LEAVES ZR-NB-95 < 15.5 08-Sep-20 HORSERADISH LEAVES I-131 < 57.1 08-Sep-20 HORSERADISH LEAVES CS-134 < 19.0 08-Sep-20 HORSERADISH LEAVES CS-137 < 16.9 12-Oct-20 HORSERADISH LEAVES BE-7 550.6 +/- 212.3 12-Oct-20 HORSERADISH LEAVES K-40 7,651.7 +/- 617.6 12-Oct-20 HORSERADISH LEAVES MN-54 < 17.4 12-Oct-20 HORSERADISH LEAVES CO-58 < 19.2 12-Oct-20 HORSERADISH LEAVES FE-59 < 31.3 12-Oct-20 HORSERADISH LEAVES CO-60 < 15.7 12-Oct-20 HORSERADISH LEAVES ZN-65 < 38.0 12-Oct-20 HORSERADISH LEAVES ZR-NB-95 < 20.3 12-Oct-20 HORSERADISH LEAVES I-131 < 48.1 12-Oct-20 HORSERADISH LEAVES CS-134 < 19.2 12-Oct-20 HORSERADISH LEAVES CS-137 < 13.4 2020 Annual Radiological Environmental Operating Report Page C - 88 Wolf Creek Generating Station

Exposure Pathway - Ingestion Food/Garden Location: H-2 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 18-May-20 HORSERADISH LEAVES BE-7 811.7 +/- 174.0 18-May-20 HORSERADISH LEAVES K-40 2,845.2 +/- 379.9 18-May-20 HORSERADISH LEAVES MN-54 < 14.9 18-May-20 HORSERADISH LEAVES CO-58 < 15.6 18-May-20 HORSERADISH LEAVES FE-59 < 32.0 18-May-20 HORSERADISH LEAVES CO-60 < 10.8 18-May-20 HORSERADISH LEAVES ZN-65 < 16.8 18-May-20 HORSERADISH LEAVES ZR-NB-95 < 10.9 18-May-20 HORSERADISH LEAVES I-131 < 18.6 18-May-20 HORSERADISH LEAVES CS-134 < 15.8 18-May-20 HORSERADISH LEAVES CS-137 < 14.8 23-Jun-20 HORSERADISH LEAVES BE-7 1,491.1 +/- 468.1 23-Jun-20 HORSERADISH LEAVES K-40 7,947.5 +/- 988.6 23-Jun-20 HORSERADISH LEAVES MN-54 < 33.2 23-Jun-20 HORSERADISH LEAVES CO-58 < 19.0 23-Jun-20 HORSERADISH LEAVES FE-59 < 75.0 23-Jun-20 HORSERADISH LEAVES CO-60 < 21.1 23-Jun-20 HORSERADISH LEAVES ZN-65 < 60.5 23-Jun-20 HORSERADISH LEAVES ZR-NB-95 < 21.0 23-Jun-20 HORSERADISH LEAVES I-131 < 43.5 23-Jun-20 HORSERADISH LEAVES CS-134 < 40.4 23-Jun-20 HORSERADISH LEAVES CS-137 < 22.5 28-Jul-20 HORSERADISH LEAVES BE-7 1,405.1 +/- 124.0 28-Jul-20 HORSERADISH LEAVES K-40 5,425.8 +/- 241.8 28-Jul-20 HORSERADISH LEAVES MN-54 < 7.6 28-Jul-20 HORSERADISH LEAVES CO-58 < 6.3 28-Jul-20 HORSERADISH LEAVES FE-59 < 15.1 28-Jul-20 HORSERADISH LEAVES CO-60 < 8.5 28-Jul-20 HORSERADISH LEAVES ZN-65 < 19.6 28-Jul-20 HORSERADISH LEAVES ZR-NB-95 < 10.9 28-Jul-20 HORSERADISH LEAVES I-131 < 24.8 28-Jul-20 HORSERADISH LEAVES CS-134 < 8.9 28-Jul-20 HORSERADISH LEAVES CS-137 < 10.2 17-Aug-20 HORSERADISH LEAVES BE-7 2,129.1 +/- 334.1 17-Aug-20 HORSERADISH LEAVES K-40 7,363.4 +/- 898.6 17-Aug-20 HORSERADISH LEAVES MN-54 < 29.0 17-Aug-20 HORSERADISH LEAVES CO-58 < 31.0 17-Aug-20 HORSERADISH LEAVES FE-59 < 65.8 2020 Annual Radiological Environmental Operating Report Page C - 89 Wolf Creek Generating Station

Exposure Pathway - Ingestion Food/Garden Location: H-2 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 17-Aug-20 HORSERADISH LEAVES CO-60 < 31.1 17-Aug-20 HORSERADISH LEAVES ZN-65 < 54.1 17-Aug-20 HORSERADISH LEAVES ZR-NB-95 < 45.1 17-Aug-20 HORSERADISH LEAVES I-131 < 37.3 17-Aug-20 HORSERADISH LEAVES CS-134 < 36.5 17-Aug-20 HORSERADISH LEAVES CS-137 < 24.6 08-Sep-20 HORSERADISH LEAVES BE-7 607.1 +/- 230.3 Duplicate 08-Sep-20 HORSERADISH LEAVES BE-7 496.4 +/- 170.6 08-Sep-20 HORSERADISH LEAVES K-40 4,971.8 +/- 446.1 Duplicate 08-Sep-20 HORSERADISH LEAVES K-40 4,643.5 +/- 542.6 08-Sep-20 HORSERADISH LEAVES MN-54 < 15.2 Duplicate 08-Sep-20 HORSERADISH LEAVES MN-54 < 13.1 08-Sep-20 HORSERADISH LEAVES CO-58 < 16.8 Duplicate 08-Sep-20 HORSERADISH LEAVES CO-58 < 16.3 08-Sep-20 HORSERADISH LEAVES FE-59 < 27.2 Duplicate 08-Sep-20 HORSERADISH LEAVES FE-59 < 25.7 08-Sep-20 HORSERADISH LEAVES CO-60 < 19.7 Duplicate 08-Sep-20 HORSERADISH LEAVES CO-60 < 19.8 08-Sep-20 HORSERADISH LEAVES ZN-65 < 51.9 Duplicate 08-Sep-20 HORSERADISH LEAVES ZN-65 < 21.7 08-Sep-20 HORSERADISH LEAVES ZR-NB-95 < 16.6 08-Sep-20 HORSERADISH LEAVES ZR-NB-95 < 36.1 Duplicate 08-Sep-20 HORSERADISH LEAVES I-131 < 31.8 08-Sep-20 HORSERADISH LEAVES I-131 < 59.7 Duplicate 08-Sep-20 HORSERADISH LEAVES CS-134 < 24.1 Duplicate 08-Sep-20 HORSERADISH LEAVES CS-134 < 23.1 08-Sep-20 HORSERADISH LEAVES CS-137 < 13.7 08-Sep-20 HORSERADISH LEAVES CS-137 < 10.7 Duplicate 12-Oct-20 HORSERADISH LEAVES BE-7 517.6 +/- 123.4 12-Oct-20 HORSERADISH LEAVES K-40 7,109.7 +/- 316.1 12-Oct-20 HORSERADISH LEAVES MN-54 < 11.0 12-Oct-20 HORSERADISH LEAVES CO-58 < 12.0 12-Oct-20 HORSERADISH LEAVES FE-59 < 25.1 12-Oct-20 HORSERADISH LEAVES CO-60 < 9.5 12-Oct-20 HORSERADISH LEAVES ZN-65 < 17.9 12-Oct-20 HORSERADISH LEAVES ZR-NB-95 < 11.3 12-Oct-20 HORSERADISH LEAVES I-131 < 25.2 12-Oct-20 HORSERADISH LEAVES CS-134 < 8.8 2020 Annual Radiological Environmental Operating Report Page C - 90 Wolf Creek Generating Station

Exposure Pathway - Ingestion Food/Garden Location: H-2 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 12-Oct-20 HORSERADISH LEAVES CS-137 < 8.6 2020 Annual Radiological Environmental Operating Report Page C - 91 Wolf Creek Generating Station

Exposure Pathway - Ingestion Food/Garden Location: Q-6 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 18-May-20 HORSERADISH LEAVES BE-7 1,684.5 +/- 299.4 18-May-20 HORSERADISH LEAVES K-40 4,827.9 +/- 594.1 18-May-20 HORSERADISH LEAVES MN-54 < 17.8 18-May-20 HORSERADISH LEAVES CO-58 < 19.0 18-May-20 HORSERADISH LEAVES FE-59 < 40.2 18-May-20 HORSERADISH LEAVES CO-60 < 20.2 18-May-20 HORSERADISH LEAVES ZN-65 < 39.7 18-May-20 HORSERADISH LEAVES ZR-NB-95 < 20.6 18-May-20 HORSERADISH LEAVES I-131 < 25.1 18-May-20 HORSERADISH LEAVES CS-134 < 24.7 18-May-20 HORSERADISH LEAVES CS-137 < 15.4 23-Jun-20 HORSERADISH LEAVES BE-7 852.1 +/- 218.8 23-Jun-20 HORSERADISH LEAVES K-40 4,280.4 +/- 623.0 23-Jun-20 HORSERADISH LEAVES MN-54 < 19.5 23-Jun-20 HORSERADISH LEAVES CO-58 < 19.6 23-Jun-20 HORSERADISH LEAVES FE-59 < 44.9 23-Jun-20 HORSERADISH LEAVES CO-60 < 17.9 23-Jun-20 HORSERADISH LEAVES ZN-65 < 23.3 23-Jun-20 HORSERADISH LEAVES ZR-NB-95 < 23.0 23-Jun-20 HORSERADISH LEAVES I-131 < 26.8 23-Jun-20 HORSERADISH LEAVES CS-134 < 21.3 23-Jun-20 HORSERADISH LEAVES CS-137 < 29.7 2020 Annual Radiological Environmental Operating Report Page C - 92 Wolf Creek Generating Station

Exposure Pathway - Ingestion Food/Crops Location: NR-D1 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 07-Oct-20 NON-IRRIGATED CORN BE-7 < 61.8 07-Oct-20 NON-IRRIGATED CORN K-40 2,651.5 +/- 285.3 07-Oct-20 NON-IRRIGATED CORN MN-54 < 10.3 07-Oct-20 NON-IRRIGATED CORN CO-58 < 5.5 07-Oct-20 NON-IRRIGATED CORN FE-59 < 28.6 07-Oct-20 NON-IRRIGATED CORN CO-60 < 11.9 07-Oct-20 NON-IRRIGATED CORN ZN-65 < 15.4 07-Oct-20 NON-IRRIGATED CORN ZR-NB-95 < 12.1 07-Oct-20 NON-IRRIGATED CORN I-131 < 41.2 07-Oct-20 NON-IRRIGATED CORN CS-134 < 11.5 07-Oct-20 NON-IRRIGATED CORN CS-137 < 11.1 29-Oct-20 NON-IRRIGATED CORN BE-7 < 80.0 29-Oct-20 NON-IRRIGATED CORN K-40 3,552.4 +/- 304.6 29-Oct-20 NON-IRRIGATED CORN MN-54 < 9.3 29-Oct-20 NON-IRRIGATED CORN CO-58 < 7.5 29-Oct-20 NON-IRRIGATED CORN FE-59 < 19.5 29-Oct-20 NON-IRRIGATED CORN CO-60 < 6.4 29-Oct-20 NON-IRRIGATED CORN ZN-65 < 21.9 29-Oct-20 NON-IRRIGATED CORN ZR-NB-95 < 10.1 29-Oct-20 NON-IRRIGATED CORN I-131 < 22.4 29-Oct-20 NON-IRRIGATED CORN CS-134 < 10.3 29-Oct-20 NON-IRRIGATED CORN CS-137 < 10.4 04-Nov-20 IRRIGATED SOYBEANS BE-7 < 127.6 04-Nov-20 IRRIGATED SOYBEANS K-40 18,435.0 +/- 784.0 04-Nov-20 IRRIGATED SOYBEANS MN-54 < 20.6 04-Nov-20 IRRIGATED SOYBEANS CO-58 < 19.3 04-Nov-20 IRRIGATED SOYBEANS FE-59 < 51.5 04-Nov-20 IRRIGATED SOYBEANS CO-60 < 24.9 04-Nov-20 IRRIGATED SOYBEANS ZN-65 < 39.6 04-Nov-20 IRRIGATED SOYBEANS ZR-NB-95 < 19.8 04-Nov-20 IRRIGATED SOYBEANS I-131 < 53.4 04-Nov-20 IRRIGATED SOYBEANS CS-134 < 19.1 04-Nov-20 IRRIGATED SOYBEANS CS-137 < 18.4 2020 Annual Radiological Environmental Operating Report Page C - 93 Wolf Creek Generating Station

Exposure Pathway - Ingestion Food/Crops Location: NR-U1 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 04-Nov-20 NON-IRRIGATED SOYBEANS BE-7 < 178.3 04-Nov-20 NON-IRRIGATED SOYBEANS K-40 14,538.0 +/- 681.5 04-Nov-20 NON-IRRIGATED SOYBEANS MN-54 < 17.2 04-Nov-20 NON-IRRIGATED SOYBEANS CO-58 < 14.6 04-Nov-20 NON-IRRIGATED SOYBEANS FE-59 < 44.4 04-Nov-20 NON-IRRIGATED SOYBEANS CO-60 < 13.8 04-Nov-20 NON-IRRIGATED SOYBEANS ZN-65 < 40.4 04-Nov-20 NON-IRRIGATED SOYBEANS ZR-NB-95 < 12.8 04-Nov-20 NON-IRRIGATED SOYBEANS I-131 < 53.8 04-Nov-20 NON-IRRIGATED SOYBEANS CS-134 < 18.0 04-Nov-20 NON-IRRIGATED SOYBEANS CS-137 < 17.9 2020 Annual Radiological Environmental Operating Report Page C - 94 Wolf Creek Generating Station

Exposure Pathway - Aquatic Bottom Sediment Location: DC Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Dry) Analysis 27-May-20 BOTTOM SEDIMENT K-40 8,344.4 +/- 571.3 27-May-20 BOTTOM SEDIMENT MN-54 < 16.8 27-May-20 BOTTOM SEDIMENT CO-58 < 19.3 27-May-20 BOTTOM SEDIMENT FE-59 < 47.1 27-May-20 BOTTOM SEDIMENT CO-60 < 22.0 27-May-20 BOTTOM SEDIMENT ZN-65 < 44.8 27-May-20 BOTTOM SEDIMENT CS-134 < 18.5 27-May-20 BOTTOM SEDIMENT CS-137 32.9 +/- 17.2 27-May-20 BOTTOM SEDIMENT FE-55 < 26,338.0 15-Oct-20 BOTTOM SEDIMENT K-40 11,282.0 +/- 956.5 15-Oct-20 BOTTOM SEDIMENT MN-54 < 39.1 15-Oct-20 BOTTOM SEDIMENT CO-58 < 53.3 15-Oct-20 BOTTOM SEDIMENT FE-59 < 165.9 15-Oct-20 BOTTOM SEDIMENT CO-60 < 22.0 15-Oct-20 BOTTOM SEDIMENT ZN-65 < 72.7 15-Oct-20 BOTTOM SEDIMENT CS-134 < 27.9 15-Oct-20 BOTTOM SEDIMENT CS-137 < 48.1 15-Oct-20 BOTTOM SEDIMENT FE-55 < 5,391.0 2020 Annual Radiological Environmental Operating Report Page C - 95 Wolf Creek Generating Station

Exposure Pathway - Aquatic Bottom Sediment Location: EEA Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Dry) Analysis 19-Jun-20 BOTTOM SEDIMENT K-40 10,360.0 +/- 530.0 19-Jun-20 BOTTOM SEDIMENT MN-54 < 19.7 19-Jun-20 BOTTOM SEDIMENT CO-58 < 18.0 19-Jun-20 BOTTOM SEDIMENT FE-59 < 32.1 19-Jun-20 BOTTOM SEDIMENT CO-60 < 17.1 19-Jun-20 BOTTOM SEDIMENT ZN-65 < 38.4 19-Jun-20 BOTTOM SEDIMENT CS-134 < 15.9 19-Jun-20 BOTTOM SEDIMENT CS-137 < 15.9 2020 Annual Radiological Environmental Operating Report Page C - 96 Wolf Creek Generating Station

Exposure Pathway - Aquatic Bottom Sediment Location: JRR Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Dry) Analysis 23-Apr-20 BOTTOM SEDIMENT K-40 13,048.0 +/- 1,168.9 23-Apr-20 BOTTOM SEDIMENT MN-54 < 59.9 23-Apr-20 BOTTOM SEDIMENT CO-58 < 43.8 23-Apr-20 BOTTOM SEDIMENT FE-59 < 125.3 23-Apr-20 BOTTOM SEDIMENT CO-60 < 25.6 23-Apr-20 BOTTOM SEDIMENT ZN-65 < 97.5 23-Apr-20 BOTTOM SEDIMENT CS-134 < 36.8 23-Apr-20 BOTTOM SEDIMENT CS-137 88.7 +/- 45.5 15-Oct-20 BOTTOM SEDIMENT K-40 12,966.0 +/- 943.4 15-Oct-20 BOTTOM SEDIMENT MN-54 < 35.0 15-Oct-20 BOTTOM SEDIMENT CO-58 < 65.0 15-Oct-20 BOTTOM SEDIMENT FE-59 < 89.2 15-Oct-20 BOTTOM SEDIMENT CO-60 < 26.8 15-Oct-20 BOTTOM SEDIMENT ZN-65 < 105.6 15-Oct-20 BOTTOM SEDIMENT CS-134 < 41.4 15-Oct-20 BOTTOM SEDIMENT CS-137 < 44.0 2020 Annual Radiological Environmental Operating Report Page C - 97 Wolf Creek Generating Station

Exposure Pathway - Aquatic Bottom Sediment Location: MUDS Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Dry) Analysis 15-Apr-20 BOTTOM SEDIMENT K-40 9,440.8 +/- 571.7 15-Apr-20 BOTTOM SEDIMENT MN-54 < 22.8 15-Apr-20 BOTTOM SEDIMENT CO-58 < 26.2 15-Apr-20 BOTTOM SEDIMENT FE-59 < 61.9 15-Apr-20 BOTTOM SEDIMENT CO-60 < 13.8 15-Apr-20 BOTTOM SEDIMENT ZN-65 < 36.6 15-Apr-20 BOTTOM SEDIMENT CS-134 < 14.2 15-Apr-20 BOTTOM SEDIMENT CS-137 < 14.2 08-Jun-20 BOTTOM SEDIMENT K-40 11,031.0 +/- 652.4 08-Jun-20 BOTTOM SEDIMENT MN-54 < 26.4 08-Jun-20 BOTTOM SEDIMENT CO-58 < 34.3 08-Jun-20 BOTTOM SEDIMENT FE-59 < 38.9 08-Jun-20 BOTTOM SEDIMENT CO-60 < 22.8 08-Jun-20 BOTTOM SEDIMENT ZN-65 < 52.5 08-Jun-20 BOTTOM SEDIMENT CS-134 < 24.1 08-Jun-20 BOTTOM SEDIMENT CS-137 334.7 +/- 43.7 2020 Annual Radiological Environmental Operating Report Page C - 98 Wolf Creek Generating Station

Exposure Pathway - Aquatic Vegetation Location: EEA Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 17-Aug-20 PRIMROSE BE-7 701.5 +/- 286.5 17-Aug-20 PRIMROSE K-40 2,797.2 +/- 470.4 17-Aug-20 PRIMROSE MN-54 < 25.1 17-Aug-20 PRIMROSE CO-58 < 20.0 17-Aug-20 PRIMROSE FE-59 < 38.5 17-Aug-20 PRIMROSE CO-60 < 13.0 17-Aug-20 PRIMROSE ZN-65 < 56.7 17-Aug-20 PRIMROSE ZR-NB-95 < 36.1 17-Aug-20 PRIMROSE I-131 < 21.9 17-Aug-20 PRIMROSE CS-134 < 25.9 17-Aug-20 PRIMROSE CS-137 < 25.1 2020 Annual Radiological Environmental Operating Report Page C - 99 Wolf Creek Generating Station

Exposure Pathway - Aquatic Vegetation Location: MUDS Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 04-Sep-20 BRITTLE NAIAD BE-7 266.9 +/- 124.1 04-Sep-20 BRITTLE NAIAD K-40 3,129.1 +/- 279.8 04-Sep-20 BRITTLE NAIAD MN-54 < 10.0 04-Sep-20 BRITTLE NAIAD CO-58 < 8.7 04-Sep-20 BRITTLE NAIAD FE-59 < 13.5 04-Sep-20 BRITTLE NAIAD CO-60 < 9.6 04-Sep-20 BRITTLE NAIAD ZN-65 < 14.2 04-Sep-20 BRITTLE NAIAD ZR-NB-95 < 14.7 04-Sep-20 BRITTLE NAIAD I-131 < 27.1 04-Sep-20 BRITTLE NAIAD CS-134 < 10.4 04-Sep-20 BRITTLE NAIAD CS-137 < 12.8 2020 Annual Radiological Environmental Operating Report Page C - 100 Wolf Creek Generating Station

Exposure Pathway - Aquatic Vegetation Location: SC Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 23-Sep-20 CATTAILS BE-7 686.3 +/- 221.2 23-Sep-20 CATTAILS K-40 4,449.0 +/- 424.0 23-Sep-20 CATTAILS MN-54 < 13.9 23-Sep-20 CATTAILS CO-58 < 8.0 23-Sep-20 CATTAILS FE-59 < 36.9 23-Sep-20 CATTAILS CO-60 < 17.4 23-Sep-20 CATTAILS ZN-65 < 16.1 23-Sep-20 CATTAILS ZR-NB-95 < 16.3 23-Sep-20 CATTAILS I-131 < 35.0 23-Sep-20 CATTAILS CS-134 < 16.7 23-Sep-20 CATTAILS CS-137 < 13.8 2020 Annual Radiological Environmental Operating Report Page C - 101 Wolf Creek Generating Station

Exposure Pathway - Terrestrial Vegetation Location: EEA Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 29-Jun-20 PASTURAGE BE-7 492.9 +/- 178.7 29-Jun-20 PASTURAGE K-40 7,516.9 +/- 577.8 29-Jun-20 PASTURAGE MN-54 < 18.5 29-Jun-20 PASTURAGE CO-58 < 19.5 29-Jun-20 PASTURAGE FE-59 < 24.0 29-Jun-20 PASTURAGE CO-60 < 17.6 29-Jun-20 PASTURAGE ZN-65 < 47.6 29-Jun-20 PASTURAGE ZR-NB-95 < 14.0 29-Jun-20 PASTURAGE I-131 < 50.5 29-Jun-20 PASTURAGE CS-134 < 16.9 29-Jun-20 PASTURAGE CS-137 < 22.0 2020 Annual Radiological Environmental Operating Report Page C - 102 Wolf Creek Generating Station

Exposure Pathway - Terrestrial Vegetation Location: MUDS Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 29-Jun-20 PASTURAGE BE-7 2,262.0 +/- 322.0 29-Jun-20 PASTURAGE BE-7 2,780.0 +/- 355.0 Duplicate 29-Jun-20 PASTURAGE K-40 2,715.1 +/- 455.0 29-Jun-20 PASTURAGE K-40 3,386.3 +/- 569.6 Duplicate 29-Jun-20 PASTURAGE MN-54 < 22.9 29-Jun-20 PASTURAGE MN-54 < 22.3 Duplicate 29-Jun-20 PASTURAGE CO-58 < 18.3 Duplicate 29-Jun-20 PASTURAGE CO-58 < 15.8 29-Jun-20 PASTURAGE FE-59 < 23.9 Duplicate 29-Jun-20 PASTURAGE FE-59 < 38.9 29-Jun-20 PASTURAGE CO-60 < 13.3 29-Jun-20 PASTURAGE CO-60 < 19.8 Duplicate 29-Jun-20 PASTURAGE ZN-65 < 46.5 Duplicate 29-Jun-20 PASTURAGE ZN-65 < 11.6 29-Jun-20 PASTURAGE ZR-NB-95 < 23.5 Duplicate 29-Jun-20 PASTURAGE ZR-NB-95 < 18.0 29-Jun-20 PASTURAGE I-131 < 58.9 Duplicate 29-Jun-20 PASTURAGE I-131 < 38.5 29-Jun-20 PASTURAGE CS-134 < 27.3 Duplicate 29-Jun-20 PASTURAGE CS-134 < 23.4 29-Jun-20 PASTURAGE CS-137 < 25.5 29-Jun-20 PASTURAGE CS-137 < 31.2 Duplicate 2020 Annual Radiological Environmental Operating Report Page C - 103 Wolf Creek Generating Station

Exposure Pathway - Terrestrial Soil Location: EEA Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Dry) Analysis 03-Feb-20 SOIL K-40 12,640.0 +/- 653.2 03-Feb-20 SOIL MN-54 < 22.9 03-Feb-20 SOIL CO-58 < 24.6 03-Feb-20 SOIL FE-59 < 35.5 03-Feb-20 SOIL CO-60 < 21.9 03-Feb-20 SOIL ZN-65 < 55.1 03-Feb-20 SOIL CS-134 < 17.9 03-Feb-20 SOIL CS-137 154.9 +/- 22.2 2020 Annual Radiological Environmental Operating Report Page C - 104 Wolf Creek Generating Station

Exposure Pathway - Ingestion Meat Location: G1.8 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 23-Nov-20 DEER K-40 3,277.8 +/- 473.4 23-Nov-20 DEER MN-54 < 15.7 23-Nov-20 DEER CO-58 < 14.3 23-Nov-20 DEER FE-59 < 19.0 23-Nov-20 DEER FE-59 < 19.0 23-Nov-20 DEER CO-60 < 14.3 23-Nov-20 DEER ZN-65 < 18.7 23-Nov-20 DEER CS-134 < 17.3 23-Nov-20 DEER CS-137 < 17.6 23-Nov-20 DEER H-3 2,601.0 +/- 142.0 2020 Annual Radiological Environmental Operating Report Page C - 105 Wolf Creek Generating Station

Exposure Pathway - Ingestion Meat Location: R3.9 Collection Sample Nuclide Concentration Duplicate Date Description (pCi/Kg Wet) Analysis 23-Apr-20 WILD TURKEY K-40 3,905.9 +/- 415.7 23-Apr-20 WILD TURKEY MN-54 < 13.9 23-Apr-20 WILD TURKEY CO-58 < 10.0 23-Apr-20 WILD TURKEY FE-59 < 31.0 23-Apr-20 WILD TURKEY CO-60 < 9.9 23-Apr-20 WILD TURKEY ZN-65 < 28.7 23-Apr-20 WILD TURKEY CS-134 < 14.5 23-Apr-20 WILD TURKEY CS-137 < 10.9 23-Apr-20 WILD TURKEY H-3 < 114.0 2020 Annual Radiological Environmental Operating Report Page C - 106 Wolf Creek Generating Station

APPENDIX D LAND USE CENSUS REPORT 2020 Annual Radiological Environmental Operating Report Wolf Creek Generating Station

WOLF CREEK GENERATING STATION 2020 LAND USE CENSUS REPORT Prepared by:

12/3/2020 Joseph p. Augustyn Date Peer Review:

12/7/2020 Jon Matthew Vopat Date Approved by:

12/7/2020 Daniel Michel Date 1998 Land Use Census 1

EXECUTIVE

SUMMARY

The annual Land Use Census of rural residents within five miles of the Wolf Creek Generating Station (WCGS) has been completed in 2020 in accordance with AP 07B-004, [Offsite Dose Calculation Manual (Radiological Environmental Monitoring Program)].

No program changes are necessary regarding milk locations. Again, no milk sampling locations were identified.

The two broadleaf vegetation locations with the highest calculated annual average D/Q rankings are A2.60-17TE1527 and Q2.35-MILA1619. Since these gardens are currently listed as sample locations for the Radiological Environmental Monitoring Program in procedure AP 07B-004 (locations A-3 and Q-6), no program changes are necessary regarding broadleaf vegetation locations.

BACKGROUND Section 5.2, Attachment A, of procedure AP 07B-004, directs that "a Land Use Census shall be conducted annually during the growing season to identify the nearest (1) milk animal, (2) residence, and (3) garden of greater than 500 square feet producing broadleaf vegetation in each of the 16 meteorological sections within five miles of the WCGS site."

Table 5-1, Attachment A, of procedure AP 07B-004, requires that broadleaf vegetation samples be collected from two indicator locations (using the criteria from the Land Use Census section) with highest calculated annual average D/Q.

Table 5-1, Attachment A, of procedure AP 07B-004, also requires that milk samples be collected from three indicator locations within 5 miles of the site having the highest dose potential.

METHODOLOGY Over two hundred surveys were mailed to the rural residents living within five miles of WCGS.

The survey excluded the residents of New Strawn and Burlington. These locations were excluded due to the large number of households and the low likelihood that information gained from these residences would affect the locations chosen for REMP sampling. Drive-by information was collected for the nearest residences in each sector that did not return surveys. Also used Google Earth/Maps to obtain images of properties.

The information collected was compiled and the results are identified in Tables 1-3. Calculations were performed so that garden locations could be ranked by their respective D/Q. These results are contained in Table 4.

2020 Land Use Census Report 1

RESULTS No changes were identified for the nearest occupied residence in each sector. Six changes were noted for the nearest garden producing broadleaf vegetation. These changes are identified as an underlined entry in the Tables. There were no changes regarding milk sample locations. Again, no locations were identified that milked animals for human consumption.

2020 Land Use Census Report 2

TABLE 1 2020 LAND USE CENSUS DATA LOCATION OF NEAREST:

SECTOR RESIDENCE MILKING ANIMALS BROADLEAF GARDEN A A2.60-17TE1527 None A2.60-17TE1527 B B3.53-QURD1755 None B4.09-18RD1739 C C1.92-16RD1655 None C3.58-RERD1675 D D2.33-RERD1520 None D2.33-RERD1520 E E1.78-QULA1451 None E4.40-TRRD1551 F F1.76-14RD1730 None F2.44-RERD1391 G G3.03-13RD1820 None G3.60-RERD1198 H H3.09-12RD1711 None H3.80-11RD1674 J J3.70-11RD1540 None J3.70-11RD1540 K K2.70-12LA1437 None K4.10-NARD1120 L L2.10-NARD1339 None L2.39-NARD1309 M M2.34-14RD1346 None M3.69-LYLA1290 N N2.08-15RD1350 None N2.08-15RD1350 P P2.76-HW751534 None P2.94-16RD1309 Q Q2.35-MILA1619 None Q2.35-MILA1619 R R2.08-NALN1650 None None NOTE: Entries underlined indicate changes from the 2019 Land Use Census.

EXAMPLE: A2.60-17TE1527 "A" = Sector A "2.60" = 2.60 miles from the reactor "17TE1527" = address 2020 Land Use Census Report 3

TABLE 2 SECTOR 2019 NEAREST 2020 NEAREST RESIDENCE RESIDENCE A A2.60-17TE1527 A2.60-17TE1527 B B3.53-QURD1755 B3.53-QURD1755 C C1.92-16RD1655 C1.92-16RD1655 D D2.33-RERD1520 D2.33-RERD1520 E E1.78-QULA1451 E1.78-QULA1451 F F1.76-14RD1730 F1.76-14RD1730 G G3.03-13RD1820 G3.03-13RD1820 H H3.09-12RD1711 H3.09-12RD1711 J J3.70-11RD1540 J3.70-11RD1540 K K2.70-12LA1437 K2.70-12LA1437 L L2.10-NARD1339 L2.10-NARD1339 M M2.34-14RD1346 M2.34-14RD1346 N N2.08-15RD1350 N2.08-15RD1350 P P2.76-HW751534 P2.76-HW751534 Q Q2.35-MILA1619 Q2.35-MILA1619 R R2.08-NALN1650 R2.08-NALN1650 NOTE: Entries underlined indicate changes from the 2019 Land Use Census.

2020 Land Use Census Report 4

TABLE 3 2020 LAND USE CENSUS MILK AND GARDEN DATA SECTOR 2019 2020 2019 NEAREST 2020 NEAREST MILKING MILKING BROADLEAF BROADLEAF ANIMALS ANIMALS GARDEN GARDEN A None None A2.60-17TE1527 A2.60-17TE1527 B None None None B4.09-18RD1739 C None None C3.58-RERD1675 C3.58-RERD1675 D None None D3.00-16RD1829 D2.33-RERD1520 E None None None E4.40-TRRD1551 F None None F3.37-14RD1904 F2.44-RERD1391 G None None None G3.60-RERD1198 H None None None H3.80-11RD1674 J None None J3.70-11RD1540 J3.70-11RD1540 K None None K4.10-NARD1120 K4.10-NARD1120 L None None L2.39-NARD1309 L2.39-NARD1309 M None None M3.78-LYRD1390 M3.69-LYLA1290 N None None N2.08-15RD1350 N2.08-15RD1350 P None None P2.94-16RD1309 P2.94-16RD1309 Q None None Q2.35-MILA1619 Q2.35-MILA1619 R None None None None NOTE: Underlined entries indicate changes from the 2019 Land Use Census.

2020 Land Use Census Report 5

TABLE 4 INFORMATION USED FOR D/Q CALCULATIONS ON GARDENS PRODUCING BROADLEAF VEGETATION FROM LAND USE FROM SA-19-002 DIST CALC NEAR NEAR FAR FAR SECTOR SECTOR (MI) (METERS) DIST D/Q DIST D/Q CALC RANKING A 2.60 4184 4000 1.94E-09 5000 1.32E-09 1.83E-09 1 B 4.09 6582 6000 4.84E-10 7000 3.59E-10 4.11E-10 8 C 3.58 5761 5000 2.51E-10 6000 1.85E-10 2.01E-10 14 D 2.33 3750 3000 4.88E-10 4000 2.93E-10 3.42E-10 11 E 4.40 7081 7000 1.28E-10 8000 1.03E-10 1.26E-10 15 F 2.44 3927 3000 6.58E-10 4000 3.95E-10 4.14E-10 7 G 3.60 5794 5000 4.68E-10 6000 3.44E-10 3.70E-10 10 H 3.80 6116 6000 4.71E-10 7000 3.50E-10 4.57E-10 6 J 3.70 5955 5000 4.59E-10 6000 3.37E-10 3.42E-10 11 K 4.00 6437 6000 4.52E-10 7000 3.36E-10 4.01E-10 9 L 2.39 3846 3000 1.02E-09 4000 6.11E-10 6.74E-10 4 M 3.69 5938 5000 4.07E-10 6000 2.99E-10 3.06E-10 13 N 2.08 3347 3000 1.10E-09 4000 6.62E-10 9.48E-10 3 P 2.94 4731 4000 7.51E-10 5000 5.11E-10 5.76E-10 5 Q 2.35 3782 3000 1.53E-09 4000 9.17E-10 1.05E-09 2 R*

• Sector R no broadleaf gardens to report.

Originated by: Date: 12/3/2020 Verified by: Date: 12/7/2020 2020 Land Use Census Report 6