NG-22-0053, 2021 Annual Radiological Environmental Operating Report

2021 Annual Radiological Environmental Operating Report

ML22126A035
Person / Time
Site:	Duane Arnold
Issue date:	05/06/2022
From:	Hansen P NextEra Energy Duane Arnold
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NG-22-0053
Download: ML22126A035 (120)

Text

NEXTeraM ENERGY~

DUANE ARNOLD May 6, 2022 NG-22-0053 FPL-3 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 Duane Arnold Energy Center Docket No. 50-331 Renewed Op. License No. DPR-49

Subject:

2021 Annual Radiological Environmental Operating Report Please find as Enclosure 1 to this letter, a copy of NextEra Energy Duane Arnold, LLC's 2021 Annual Radiological Environmental Operating Report for the Duane Arnold Energy Center, pursuant to the requirements of DODAM Section 8.2.2 and FPL-3 Appendix G.

This letter contains no new commitments and does not revise any existing commitments.

Should you have any questions regarding this matter, please contact Michael Casey at (319) 851-7606 .

pew.,1 HC<n.s.e'1 Paul Hansen Decommissioning Director NextEra Energy Duane Arnold, LLC Enclosure cc: Regional Administrator, USNRC, Region Ill Inspector, USNRC, Duane Arnold Energy Center Project Manager, USNRC, Duane Arnold Energy Center NextE ra En ergy Duane Arnold, LLC, 3277 DAEC Ro ad, Palo, IA 5232 4

Enclosure to NG-22-0053 Duane Arnold Energy Center 2021 Annual Radiological Environmental Operating Report 118 pages follow

NEXTera' ENER ~G _....

-J"-0

~

• _r DUANE

/' ARNOLD 2021 Annual Radiological Environmental Operating Report Duane Arnold Energy Center Cedar Rapids, Iowa Docket No. 50-331 January 1, 2021 through December 31, 2021

2020 Annual Radiological Environmental Operating Report Duane Arnold Energy Center DOCKET NUMBER. 50-331 ReviewedBy: ~ ~

Micha Approved By: ~ ~Oil\~

Paul Hansen Date: ?*? *ZP't 1--

~ Al l Environmental, Inc.

/"'\I Midwest Laboratory 700 Landwehr Road

• Non hbrook, IL 60062-2310 phone (8*17) 564-0700

• fa ~ (8'17) 56H 5 I 7 DUANE ARNOLD ENERGY CENTER CEDAR RAPIDS, IOWA DOCKET NO. 50-331 REPORT to the UNITED STATES NUCLEAR REGULATORY COMMISSION Annual Radiological Environmental Operating Report January 1 to December 31 , 2021 Prepared by ATI ENVIRONMENTAL, Inc.

Midwest Laboratory Project No. 8001 Reviewed and Approved Ashok Banavali, Ph.D.

Laboratory Manager

PREFACE Staff members of the Environmental, Inc., Midwest Laboratory were responsible for the acquisition of data presented in this report, with the exception of Appendices D and E which were completed by DAEC personnel. All environmental samples, with the exception of aquatic, were collected by personnel of DAEC. Aquatic samples were collected by the University of Iowa Hygienic Laboratory.

The report was prepared by Environmental, Inc., Midwest Laboratory, with the exception of Appendices D and E, which were prepared by DAEC personnel.

ii

TABLE OF CONTENTS PARTI No.

PREFACE ..................................................................................................................... ii List of Tables ................................................................................................................. v List of Figures ............................................................................................................... vi

1.0 INTRODUCTION

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

SUMMARY

................................................................................................................... 2 3.0 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ............................... 3 3.1 Program Design and Data Interpretation .......................................................... 3 3.2 Program Description ............................................................................................. 4 3.2.1 Environmental Monitoring ........................................................................ 4 3.2.2 Groundwater Protection Program ............................................................ 5 3.3 Program Execution ............................................................................................... 5 3.4 Laboratory Procedures ..................................................................................... 6 3.5 Program Modifications .......................................................................................... 6 4.0 RES ULTS AND DISCUSSION ..................................................................................... 7 4.1 Atmospheric Nuclear Detonations and Nuclear Accidents ..................................... 7 4.2 Program Findings ................................................................................................. 7 4.3 Groundwater Protection Program Findings ......................................................... 9 5.0 TABLES AND FIGURES ............................................................................................. 11

6.0 REFERENCES

CITED ............................................................................................... 26 APPENDICES A lnterlaboratory Comparison Program Results .......................................................... A-1 B Data Reporting Conventions ........................................................................................ B-1 C Effluent Concentration Limits for Radioactivity in Air and Water Above Background in Unrestricted Areas ............................................................................ C-1 D Summary of the Land Use Census ............................................................................ D-1 E Annual Radiation Dose Assessment ......................................................................... E-1 iii

TABLE OF CONTENTS (continued)

PARTll Data Tabulations and Analyses ...................................................................................... i iv

LIST OF TABLES 5.1 Characteristic Properties of Isotopes Quantified in Gamma-spectroscopic Analyses .................................................................................................................... 12 5.2 Sample Collection and Analysis Program ..................................................................... 13 5.3 Sampling Locations, DAEC .......................................................................................... 15 5.4 Type and Frequency of Collections .............................................................................. 17 5.5 Sample Codes for Tables 5.4 and 5.6 .......................................................................... 18 5.6 Program Deviations .......................................................................................................... 19 5.7 Radiological Environmental Monitoring Program Summary ......................................... 21 In addition, the following tables are included in the Appendices:

Appendix A A-0 Attachment A ..................................................................................................................A-2 A-1 Environmental Resource Associates (RAD) ..................................................................A-3 A-2 lnterlaboratory Comparison Program Results, Thermo luminescent Dosimeters(TLDs) ..........................................................................A-4 A-3 In-house "Spiked" Samples ............................................................................................A-6 A-4 In-house "Blank" Samples ............................................................................................ A-8 A-5 In-house "Duplicate" Samples .................................................................................... A-10 A-6 Department of Energy MAPEP comparison results .................................................... A-14 A-7 Environmental Resource Associates (MRAD) ....................................................A-16 AppendixC C-1 Effluent Concentration Limits for Radioactivity in Air and Water Above Background in Unrestricted Areas .................................................................. C-2 v

LIST OF FIGURES 5.1 Radiological Environmental Monitoring Program Sampling Stations near the Duane Arnold Energy Center ......................................................................... 25 5.2 Radiological Environmental Monitoring Program Sampling Stations Outside 0.5 Miles .........................................................................................................26 vi

1.0 INTRODUCTION

This report summarizes and interprets results of the Radiological Environmental Monitoring Program (REMP) conducted by Environmental, Inc., Midwest Laboratory at the Duane Arnold Energy Center, Palo, Iowa, during the period January - December 2021. This Program monitors the levels of radioactivity in the air, terrestrial, and aquatic environments in order to assess the impact of the plant on its surroundings.

The REMP fulfills the requirements of Sections IV.B.2 and IV.B.3 of Appendix I to 10 CFR 50 for the operation of the plant. The REMP also fulfills the requirements of 10 CFR 72.44(d)(2) for operation of the ISFSI.

Tabulations of individual analyses made during the year are included in Part II of this report.

The Duane Arnold Energy Center (DAEC) is a boiling water reactor, located in Linn County, Iowa, on the Cedar River, and owned and operated by NextEra Energy Resources. Initial criticality was attained on March 23, 1974. The reactor reached 100% power on August 12, 1974. Commercial operation began on February 1, 1975.

In July of 2018, NextEra Energy Duane Arnold L.L.C. announced the cessation of power operations planned for the 4th quarter of 2020. However, a severe windstorm on August 10, 2020, damaged the plant's cooling towers. There were no abnormal releases as all safety systems functioned as designed.

The reactor was permanently defueled on October 12, 2020. The decommissioning process has started with the layup plans for long-term dormancy period prior to returning the area to a greenfield. The plant is being placed in SAFSTOR.

2.0

SUMMARY

The Radiological Environmental Monitoring Program, as required by the U.S. Nuclear Regulatory Commission (NRC) Technical Specifications for the Duane Arnold Energy Center, is herein described.

Results for the year 2021 are summarized and discussed. Information regarding DAEC effluents and the Offsite Dose Assessment Manual (ODAM) and Defueled Offsite Dose Assessment Manual (DODAM) can be found in the 2021 DAEC Annual Radiological Material Release Report (ARMRR).

Program findings show only background levels of radioactivity in the environmental samples collected in the vicinity of the Duane Arnold Energy Center.

No effect on the environment is indicated in the areas surrounding the site of the Duane Arnold Energy Center.

2

3.0 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM 3.1 Program Design and Data Interpretation The purpose of the Radiological Environmental Monitoring Program at the Duane Arnold Energy Center (DAEC) is to assess the impact of the plant on its environment. For this purpose, samples are collected from the air, terrestrial, and aquatic environments and analyzed for radioactive content. In addition, ambient gamma radiation levels are monitored by thermoluminescent dosimeters (TLDs).

Sources of environmental radiation include the following:

(1) Natural background radiation arising from cosmic rays and primordial radionuclides; (2) Fallout from atmospheric nuclear detonations; (3) Releases from nuclear power plants; and (4) Industrial and medical radioactive waste.

In interpreting the data, effects due to the DAEC operation must be distinguished from those due to other sources.

A major interpretive aid in assessment of these effects is the design of the monitoring program at the DAEC which is based on the indicator-control concept. Most types of samples are collected both at indicator locations (nearby, downwind, or downstream) and at control locations (distant, upwind, or upstream). A station effect would be indicated if the radiation level at an indicator location was significantly larger than that at the control location. The difference would have to be greater than could be accounted for by typical fluctuations in radiation levels arising from other sources.

An additional interpretive technique involves analyses for specific radionuclides present in the environmental samples collected from the DAEC site. The DAEC's monitoring program includes analyses for strontium-90 and iodine-131, which are fission products, and tritium, which is produced by cosmic rays, atmospheric nuclear detonations, and also by nuclear power plants. Most samples are also analyzed for gamma-emitting isotopes with results for the following groups quantified: zirconium-95, cesium-137, and cerium-144. These three gamma-emitting isotopes were selected as radiological impact indicators because of the different characteristic proportions in which they appear in the fission product mix produced by a nuclear reactor and that produced by a nuclear detonation. Each of the three isotopes is produced in roughly equivalent amounts by a reactor: each constitutes about 10% of the total activity of fission products ten (10) days after reactor shutdown. Alternatively, ten (10) days after a nuclear explosion, the contributions of zirconium-95, cerium-144, and cesium-137 to the activity of the resulting debris are in the approximate ratio 4:1 :0.03 (Eisenbud, 1963). The other group quantified consists of niobium-95, ruthenium-103 and -106, cesium-134, barium-lanthanum-140, and cerium-141. These isotopes are released in small quantities by nuclear power plants, but to date their major source of injection into the general environment has been atmospheric nuclear testing. Nuclides of the next group, manganese-54, cobalt-58 and-60, and zinc-65, are activation products and arise from activation of corrosion products. They are typical components of nuclear power plant effluents, but are not produced in significant quantities by nuclear detonations. Nuclides of the final group, beryllium-?,

which is of cosmogenic origin, and potassium-40, a naturally-occurring isotope, were chosen as calibration monitors and provide a comparison between levels of naturally occurring radionuclides and radionuclides that could be attributed to the operation of the plant.

Characteristic properties of isotopes quantified in gamma-spectroscopic analysis are presented in Table 5.1. Other means of distinguishing sources of environmental radiation can be employed in interpreting the data. Current radiation levels can be compared with previous levels, including those measured before the plant became operational. Results of the DAEC's Monitoring Program 3

can be related to those obtained in other parts of the world. Finally, results can be related to events known to cause elevated levels of radiation in the environment, e.g., atmospheric nuclear detonations.

3.2 Program Description 3.2.1 Environmental Monitoring The sampling and analysis schedule for the Radiological Environmental Monitoring Program (REMP) at the DAEC is summarized in Table 5.2 and is briefly reviewed below. Table 5.3 defines the sampling location codes used in Table 5.2 and specifies for each location its distance, direction, and sector relative to the reactor site. The types of samples collected at each location and the frequency of collections are presented in Table 5.4 using codes defined in Table 5.5.

To monitor the air environment, a continuous air sampler is employed. Airborne particulates and activated charcoal canisters are mounted on the intake of the air sampler to collect airborne particulates and airborne iodine respectively at ten sampling locations. Nine locations are indicators:

D-3, D-4, D-5a, D-6, D-7, D-11, D-15, D-16, D-40, and control location D-13. Filters are changed and counted weekly. Particulate filters are analyzed for gross beta activity. If gross beta activity exceeds ten times the yearly mean of the control samples, gamma isotopic analysis is performed.

Quarterly composites of airborne particulates from each location are analyzed for gamma-emitting isotopes. Charcoal canister samples are analyzed weekly for iodine-131.

Ambient gamma radiation is monitored at a total of 52 locations. A TLD is placed at each location and exchanged and analyzed quarterly. The TLD locations are distributed as follows:

• Two on-site locations

• Eighteen in a circle within a 0.5 mi. radius from the DAEC stack.

• Six in 22.5° sectors within 1 mi. from the DAEC stack.

• Ten in 22.5° sectors between 1 and 3 miles from the DAEC stack.

• Twelve control locations greater than 3 miles from the DAEC stack.

• Four along sections of the Independent Spent Fuel Storage Installation (ISFSI) fence line.

Surface water is collected monthly from five total locations: D-49, D-50, D-51, D-61 and D-99. The monthly samples are analyzed for tritium and gamma-emitting isotopes. Additional analyses are performed on samples collected from the control and indicator locations, D-49 and D-61. Analyses for low-level iodine-131 are performed on monthly collections and quarterly composites are prepared and analyzed for strontium-89 and strontium-90.

The aquatic environment is also monitored at D-49 and D-61 with semiannual fish collection.

Cedar River bottom sediment is collected semiannually at the D-49, D-51, and D-107a. The samples are analyzed for gamma-emitting isotopes.

Drinking water is collected monthly from D-53, D-54, and D-52, and quarterly from D-55, D-57, D-58 and control location D-72. The samples are analyzed for tritium and gamma-emitting isotopes.

Any positive identification of a reactor by-product material initiates analyses for hard to detect isotopes of Ni-63, Sr-89, Sr-90, Fe-55 and gross alpha. The samples are analyzed for tritium, 1-131 by chemical separation to an MDC of 1 pCi/L, and gamma-emitting isotopes.

Milk sampling was discontinued in November of 2020.

4

Additional monitoring of the terrestrial environment, grain, hay, grass and broadleaf vegetation samples are collected annually, as available, from four locations: D-1 6, D-57, D-58 and D-59.

Grain, hay and broadleaf (green leafy) vegetation samples are analyzed for gamma-emitting isotopes and at least two broad leaf vegetation samples are analyzed for iodine-131.

If any of the cattle grazing on-site are slaughtered for home use, a meat sample is collected.

The sample is analyzed for gamma-emitting isotopes.

3.2.2 Groundwater Protection Program Environmental, Inc., Midwest Laboratory provides laboratory services for the Duane Arnold Energy Center Groundwater Protection Program (GWPP). The GWPP is formally included within REMP and the standards are set forth in the ODAM-DODAM, Table 6.3-2. The Groundwater Protection Program encompasses activities to ensure the protection of groundwater within the owner-c on tr o 11 e d area by sampling the groundwater, soil, precipitation, electrical vaults and sewage effluent. For sewage effluent results only, refer to the Duane Arnold Energy Center, 2021 Annual Radioactive Material Release Report and Table 22 of Part II of this report for groundwater, soil, electrical vault, and precipitation sample results.

3.3 Program Execution The program was executed as described in the preceding section with the following exceptions:

(1) REMP Air Samplers for Airborne Particulates I Airborne Iodine:

Sampling was discontinued at locations D-03, D-06, D-07, D-11 and D-40 after completion of the 4/16/21 sampling as a result of the decommissioning process begun in the fourth quarter of 2020.

(2) Thermoluminescent Dosimetry (TLD):

TLD's at locations D-02 and D-83 for the 1st quarter were missing from the field, possibly vandalized.

The TLD at location D-08 was missing in the field for the 4th quarter.

(3) Well Water:

D-58, sample not collected 8/25/21 due to a power outage at the location.

D-58, sample not collected 11/18/21 due to a power outage at the location.

(4) Surface Water:

D-49, D-61 and D-99 surface water samples not available 1/13/21 due to frozen conditions.

D-49, D-50, D-51, D-61 and D-99 surface water samples not collected 2/11/21 due to frozen conditions.

3.4 Laboratory Procedures The lodine-131 analyses in milk and water are based on EPA recognized Standard Method 7500-l-C(2000), which involves separation of iodine using an ion-exchange method, solvent extraction, and subsequent beta counting. Levels of iodine-131 in vegetation and concentrations of airborne iodine-131 in charcoal samples were determined by gamma spectroscopy.

Gamma-spectroscopic analyses are performed using high-purity germanium (HPGe) detectors.

The gamma isotopic analysis provides a spectrum with an energy range from 80 to 2048 KeV.

Specific isotopes included in the gamma library are Mn-54, Fe-59, Co-58, Co-60, Zn-65, Zr-95, 5

Nb-95, Ru-103, Ru-106, 1-131, Ba-La-140, Cs-134, Cs-137, Ce-141, and Ce-144. Naturally occurring gamma-emitters, such as Be-7, K-40 and Ra daughters, are frequently detected but may not be listed.

Tritium was measured by liquid scintillation spectrometry.

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

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

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

3.5 Program Modifications Sampling was discontinued at air station locations D-03, D-06, D-07, D-11 and D-40 after completion of the 4/16/21 sampling as a result of the decommissioning process begun in the fourth quarter of 2020.

6

4.0 RESULTS AND DISCUSSION All collections and analyses were made as scheduled, except for those listed in Table 5.6.

Results are summarized in Table 5.7 as recommended by the Nuclear Regulatory Commission.

For each type of analysis and sample medium, the table lists the mean and range of all indicator and control locations, as well as that location with the highest mean and range.

Tabulated results of measurements are not included in this section, although reference to these results will be made in discussion. A complete tabulation of results for 2021 is contained in Part II of the Annual Report on the Radiological Environmental Monitoring Program for the Duane Arnold Energy Center.

4.1 Atmospheric Nuclear Detonations and Nuclear Accidents There were no reported accidents involving significant release to the environment at nuclear reactor facilities in 2021. The Fukushima Daiichi nuclear accident occurred March 11, 2011.

There were no reported atmospheric nuclear tests in 2021. The last reported test was conducted on October 16, 1980 by the People's Republic of China.

4.2 Program Findings Results obtained show background levels of radioactivity in the environmental samples collected outside of the Owner Controlled Area in 2021.

Airborne Particulates The average annual gross beta concentrations in airborne particulates were 0.031 pCi/m3 and 0.028 pCi/m3 at the control location. Sampling was discontinued at five of the ten sampling locations after the 4/16/21 collection period. These results are consistent with levels observed from 2000 through 2020. The results are tabulated below.

Year Indicators Controls Year Indicators Controls 3 3 Concentration (pCi/m ) Concentration (pCi/m )

2000 0.026 0.027 2011 0.030 0.029 2001 0.026 0.026 2012 0.030 0.029 2002 0.027 0.027 2013 0.028 0.025 2003 0.029 0.029 2014 0.026 0.025 2004 0.028 0.028 2015 0.027 0.024 2005 0.031 0.031 2016 0.027 0.023 2006 0.029 0.027 2017 0.028 0.025 2007 0.031 0.031 2018 0.028 0.026 2008 0.029 0.029 2019 0.026 0.025 2009 0.031 0.030 2020 0.026 0.026 2010 0.028 0.028 2021 0.031 0.028 Average annual gross beta concentrations in airborne particulates.

7

4.2 Program Findings. Airborne Particulates (continued)

Gamma-spectroscopic analysis of quarterly composites of air particulate filters yielded similar results for indicator and control locations. Beryllium-7, produced continuously in the upper atmosphere by cosmic radiation (Arnold and Al-Salih, 1955), was detected in all samples, with an average activity of 0.087 pCi/m 3 for indicator locations and 0.073 pCi/m 3 for the control location.

No reactor by-product radionuclides were identified. All samples met required lower limits of detection as specified in the ODAM.

Airborne Iodine 335 weekly air samples were collected in 2021 from ten air monitoring stations. Levels of airborne 3

iodine-131 measured below the required limit of 0.030 pCi/m in all of the samples tested.

Sampling was discontinued at five of the ten locations after 4/16/21 collection period.

Ambient Radiation (TLDs) 205 TLDs were collected and analyzed in 2021. At twelve control locations, thermoluminescent dosimeter (TLD) readings averaged 14.7 mR/quarter. At locations within a half mile, one mile and three mile radius of the stack, the measurements averaged 15.6, 17.2 and 15.1 mR/quarter, respectively. The two on-site locations D-15 and D-16 averaged 14.2 and 14.1 mR/quarter respectively. These average measurements are similar to the estimated average natural background radiation for Middle America, 19.5 mR/quarter, which is based on data on Pages 71 and 108 of the report, "Natural Background Radiation in the United States" (National Council on Radiation Protection and Measurements, 1975). The terrestrial absorbed dose (uncorrected for structural and body shielding) ranges from 8.8 to 18.8 mrad/quarter and averages 11.5 mrad/quarter for Middle America. Cosmic radiation and cosmogenic radionuclides contribute 8.0 mrad/quarter for a total average of 19.5 mrad/quarter. No plant effect is indicated.

ISFSI Facility Operations Monitoring Four TLDs, placed directionally along the ISFSI fence line, averaged 3 7 .5 mR/quarter. The TLD site D-30, located between the nearest residence and the ISFSI site averaged 17.1 mR/quarter.

Calculated dose rates indicate the site is in compliance with 10 CFR 72.104 and 40 CFR 190.

Groundwater (drinking water-potable) 50 drinking water samples from seven locations were collected in 2021. Tritium concentrations in ground water samples were less than the MDC of 167 pCi/L in all samples analyzed. 1-131 and other gamma-emitting isotopes were below detection limits.

No reactor by-product radionuclides could be identified. All samples met required lower limits of detection as specified in the ODAM.

8

4.2 Program Findings (continued)

Vegetation Two broadleaf and four grain and forage vegetation samples from four locations were collected in 2021. lodine-131 concentrations in vegetation samples were less than the LLD level of 0.028 pCi/g wet weight in all samples analyzed.

With the exception of potassium-40, which was observed in all vegetation samples, all other gamma-emitting isotopes were below detection limits. No reactor by-product radionuclides were identified. All samples met required lower limits of detection as specified in the ODAM.

Surface Water 36 surface water samples were collected from five locations in 2021. One surface water tested positive for tritium at a concentration of 1335 pCi/L. This positive result is due to a release from the liquid radwaste system. No tritium was detected above an LLD of 167 pCi/L in the other 35 samples tested. No 1-131 was measured above an LLD of 0.5 pCi/L and no gamma-emitting isotopes were measured above their respective LLD's in any of the 36 samples tested.

Quarterly composites were also prepared from the samples collected at locations D-49 and D-61 and tested for strontium-89 and strontium-90. All samples tested below detection limits.

Eight fish samples from three sport fish species were collected in May and September, 2021, and analyzed for gamma-emitting isotopes. With the exception of naturally-occurring potassium-40, no gamma-emitting isotopes were identified in edible portions of fish. The potassium-40 level was similar at both the indicator and control locations (3.77 and 3.36 pCi/g wet, respectively).

No reactor by-product radionuclides were identified. All samples met required lower limits of detection as specified in the ODAM.

River Sediments Five river sediment samples from three locations were collected in 2021 during the months of March and September, and analyzed for gamma-emitting isotopes. Potassium-40 activity ranged from 5.18 to 8.51 pCi/g dry weight at the indicator locations and between 7.35 and 8.21 pCi/g dry weight at the control location.

All samples met required lower limits of detection as specified in the ODAM-DODAM.

4.3 GroundWaterProtection Program Findings Environmental, Inc., Midwest Laboratory provides laboratory services for the Duane Arnold Energy Center Ground Water Protection Program except for sewage effluent results; refer to Appendix E. Sewage effluent sample results can be found in the Duane Arnold Energy Center 2021 Annual Radiological Material Release Report.

Groundwater 139 groundwater samples (non-potable water) were collected from 55 permitted monitoring wells 2021. Tritium was the only plant by-product identified. Concentrations of tritium ranged from less than 161 pCi/L to 28,095 pCi/L at D-67, monitoring well MW-23A. An explanation of tritium mitigation can be found in the Duane Arnold Energy Center 2021 Radioactive Material Release Report. Tritium was not identified in any drinking water well on-site or at 9

off-site wells or Cedar Rapids municipal drinking water samples. Lastly, the monitoring well farthest down gradient prior to the boundary of the owner-controlled area and the Cedar River, MW-33A, did not indicate tritium above the lower level of detection, less than 168 pCi/L.

Precipitation 28 precipitation samples were collected in 2021 from seven locations. Tritium was consistently identified at location D-127. Tritium concentrations range from 202 pCi/L to 355 pCi/L (+/- 92 pCi/L) from D-127. The proximity of the plant gaseous effluent release points coupled with atmospheric conditions enables recapture of gaseous effluent, specifically tritiated water vapor, to be entrained in precipitation and deposited within the protected area.

Occasionally, tritiated precipitation collects in a basin or pit. This water is then sampled and released in accordance with the ODAM-DODAM, Table 7.1-2.

Electrical Vaults One electrical vault sample was collected in 2021. Electrical vaults are below grade structures designed for electrical cabling. Surface water and groundwater may seep into the vaults. The tritium concentration location D-121 measured less than 161 pCi/L.

Storm Drains, Sluice Pond, and Drainage Ditches Other samples collected in 2021 included two sluice pond samples from location D-122, 1 drainage ditch sample from location D-124, and one storm drain sample from location D-125. The storm drain sample tritium concentration was (239 +/- 90 pCi/L). The drainage ditch sample and sluice pond samples measured below the lower level of detection.

10

5.0 TABLES AND FIGURES 11

Table 5.1 Characteristic properties of isotopes quantified in gamma-spectroscopic analyses.

Designation Comment Isotope Half-life a Naturally Occurring A. Cosmogenic Produced by interaction of cosmic rays Be-7 53.2 d with atmosphere 9

B. Terrestrial Primordial K-40 1.26x10 y II. Fission Products b Nuclear accidents and detonations constitute the major environmental source.

A. Short-lived 1-131 8.04d Ba-140 12.8 d B. Other than Short-lived Nb-95 35.15d Zr-95 65 d Ru-103 39.35 d Ru-106 368.2 d Cs-134 2.061 y Cs-137 30.174y Ce-141 32.5 d Ce-144 284.31 d Ill. Activation Products Typically found in nuclear power plant Mn-54 312.5 d effluents Fe-59 45.0d Co-58 70.78 d Co-60 5.26y Zn-65 245 d Half-lives are taken from Appendix E of Environmental Quarterly, 1 January 1978, EML-334 (U. S. Department of Energy, 1978).

Includes fission-product daughters.

12

Table 5.2 Sample collection and analysis program.

Sampling Location a Exposure Sample Description Sampling and Collection Type and Frequency Pathway and/or Point Frequency of Analysis b Sample Type Airborne 3 Hiawatha Continuous operation of Analyze for gross beta activity Particulates 4 Pleasant Creek SRA sampler with sample more than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> after filter 5A Palo collection at least once per change. Perform gamma isotopic 6 Center Point week or as required analysis on each sample having 7 Shellsburg by dust loading gross beta activity greater than 11 Toddville ten times the yearly mean of the 13 Alburnett (C) control samples.

15 On-site North 16 On-site South Composite weekly samples to 40 Wickiup Hill form a quarterly composite (by location). Analyze quarterly composite for gamma isotopic.

Airborne 3 Hiawatha Continuous operation of Analyze each cartridge for Iodine 4 Pleasant Creek SRA sampler with sample iodine-131.

5A Palo collection at least once per 6 Center Point week.

7 Shellsburg 11 Toddville 13 Alburnett (C) 15 On-site North 16 On-site South 40 Wickiup Hill Ambient 1-3, 5A, (Controls) One dosimeter continuously Read gamma radiation dose Radiation 6-8 (Controls) at each location. quarterly.

10, 11, 13 (Indicators)

Dosimeters are changed at 15-23, Within 0.5 mile of least quarterly.

28-32, Stack 4, 33-42 Within 3.0 miles of Stack 43-48 Within 1.0 mile of 82-86, 91 Stack 161-164 ISFSI Fence line Surface Water 49 Lewis Access (C) Once per month. Gamma isotopic and tritium 50 Plant Intake analysis for each sample (by 51 Plant Discharge location).

61 - Y, mi. downstream from PlantDischarge Locations 49 and 61, analyses for low-level 1-131. Quarterly 99 Pleasant Creek Lake composites for Sr-89, Sr-90.

13

Table 5.2 Sample collection and analysis program, (continued).

Sampling Location a Exposure Sample Description Sampling and Collection Type and Frequency Pathway and/or Point Frequency of Analysis b Sample Type 52 Plant potable water Ground Analysis gamma-emitting Water 53 Treated Municipal Grab sample at least isotopes, iodine-131 and tritium Water once per quarter on quarterly samples.

54 Inlet to Municipal Water Treatment System If reactor by-product gamma-55 On-site well emitters are identified, or if tritium 57, 58 Wells off-site and concentrations measure > MDA, 72 (C) within 4 km of DAEC then analyze for Ni-63, Sr-89, Sr-90 and alpha emitters.

River 49 Lewis Access At least once every six Gamma isotopic analysis of each Sediment months. sample 50 Plant Intake (C) 51 Plant Discharge 107a North Drainage Ditch (on-site)

Vegetation 16,57 Farms raising food Annually at harvest Gamma isotopic analysis, 56, 57, crops time. Two samples of including iodine-131, on each 58,59,77, each: grain, green leafy, sample.

96,108, and forage.

110, 118 138 (C)

Fish 49 Cedar River upstream One sample per 6 Gamma isotopic analysis on edible of DAEC not months (once during portions.

influenced by effluent January through June (C) and once during July through December).

56 Downstream of DAEC 61 in influence of effluent Milk 138 (C) Farm near Newhall, IA Monthly. Gamma isotopic and iodine-131 analyses of each sample.

110 Dairy Farm within 7.8 Monthly.

miles from Site 76 Goat Farm ENE of site. Monthly depending on availability.

• (C) denotes control location. All other locations are indicators.

b Gamma isotopic analysis and analysis for gamma-emitting nuclides refer to high resolution gamma ray spectrum analysis.

14

Table 5.3 Sampling locations, Duane Arnold Energy Center.

Sampling Location Code Location Description Distance and Direction from Site Stack D-1 Cedar Rapids 20,800 meters SE D-2 Marion 16,900 meters ESE D-3 Hiawatha 10,800 meters SE D-5 Palo 4,500 meters SSW D-4 Pleasant Creek SRA 4,960 meters NW D-5A Palo 3,470 meters SSW D-6 Center Point 9,660 meters N 0-7 Shellsburg 7,950 meters W 0-8 Urbana 15,000 meters NNW 0-10 Atkins 13,600 meters SSW 0-11 Toddville 4,980 meters E 0-13 Alburnett 14,500 meters ENE D-15 On-site, North-Northwest 1,050 meters NNW D-16 On-site, South-Southeast 520 meters SSE D-17 On-site, N 1,050 meters N D-18 On-site, NNE 630 meters NNE 0-19 On-site, NE 590 meters NE 0-20 On-site, ENE 550 meters ENE 0-21 On-site, ENE 515 meters ENE 0-22 On-site, ESE 535 meters ESE D-23 On-site, SE 490 meters SE 0-28 On-site, WSW 730 meters WSW D-29 On-site,W 630 meters W 0-30 On-site, WNW 640 meters WNW 0-31 On-site, NW 1,020 meters NW 0-32 On-site, NNW 1, 110 meters NNW 0-33 3 mile rinq 4,340 meters N D-34 3 mile ring 3,930 meters NNE D-35 3 mile ring 2,800 meters NE D-36 3 mile ring 3,500 meters ENE 0-37 3 mile ring 2,960 meters E 0-38 3 mile rinq 3, 180 meters ESE 0-39 3 mile rinq 2,510 meters SE 0-40 3 mile ring 2,430 meters SSE D-41 3 mile ring 5,680 meters S D-42 3 mile ring 4,380 meters SSE 0-43 1 mile rinq 1,590 meters SSW 0-44 1 mile ring 1,580 meters WSW 0-45 1 mile ring 1,420 meters W 0-46 1 mile rinq 1,580 meters WNW D-47 1 mile rinq 1,760 meters NW 0-48 1 mile rinq 1,680 meters NNW 15

Table 5.3 Sampling locations, Duane Arnold Energy Center (continued).

Sampling Location Code Location Description Distance and Direction from Site Stack D-49 Lewis Access, upstream of DAEC 6,750 meters NNW D-50 Plant Intake 560 meters SE D-51 Plant DischarQe 600 meters SE D-52 Plant potable water On-site D-53 Treated Municipal Water 13,900 meters SE D-54 Inlet, Municipal Water Treatment System 13,900 meters SE D-55 Production Well Production wells A-D D-56 Control samples from various locations Sample location varies D-57 Farm (Off-site Well) 805 metersW D-58 Farm (Off-site Well) 97 4 meters WSW-SW D-61 Downstream of plant discharQe 670 meters SSE D-59 Hobby farm 2.615 meters SE D-72 Farm 3,200 meters SSW D-76 Farm 2,888 meters ENE D-77 Farm 2,288 meters SW D-82 On-site, SSE 660 meters SSE D-83 On-site, SSE 620 meters SSE D-84 On-site, S 610 meters s D-85 On-site, SSW 660 meters SSW D-86 On-site, SW 850 meters SW D-91 On-site, NNW 1,090 meters NNW D-96 Farm 11,400 meters SSW D-99 Pleasant Creek Lake 3,880 meters WNW D-107a North Drainage Ditch On-site D-109 Farm 5,890 meters SW D-110 Farm 12,700 meters SW D-118 Farm 2,230 meters NW D-138 Farm 21,600 meters WSW D-161 ISFSI Fence East On-site D-162 ISFSI Fence South On-site D-163 ISFSI Fence West On-site D-164 ISFSI Fence North On-site 16

Table 5.4 Type and Frequency of collections.

Location Weekly Monthly Quarterly Semiannually Annually 0-1 TLO 0-2 TLO 0-3 AP,AI TLO 0-4 AP,AI TLO 0-5 TLO 0-5A AP,AI TLO 0-6 AP.Al TLO 0-7 AP.Al TLO 0-8 TLO 0-10 TLO 0-11 AP,AI TLO 0-13 AP,AI TLO 0-15 AP,AI TLO 0-15a so 0-16 AP,AI TLO G,SO 0-17 to 0-23 TLO 0-28 to 0-39 TLD 0-40 AP.Al TLO 0-41to0-48 TLO 0-49 SW F 0-50 SW BS 0-51 SW BS 0-52 WW 0-53 WW 0-54 WW 0-55 WW 0-56 0-57 WW G 0-58 WW 0-59 G 0-61 SW F 0-72 0-76 Ml

. WW 0-77 G 0-82 to 0-86 TLO 0-91 TLD 0-99 SW ME**

0-107A BS 0-108 G 0-110 Ml G 0-118 G 0-138 Ml G 0-161to0-164 TLO On-site

• Goat's milk sampled when available.

• • Meat sampled when available.

17

Table 5.5. Sample codes used in Table 5.4 and Table 5.6.

Code Description AP Airborne Particulates Al Airborne Iodine TLD Thermolum inescent Dosimeter Ml Milk WW Well Water G Vegetation ME Meat SW Surface Water F Fish BS River Sediment so Soil 18

Table 5.6. Program Deviations, Duane Arnold Energy Center.

Sample Collection Date Type Analysis Location( s) or Period Comments SW D-49 01-13-21 Unable to collect sample, water frozen.

SW D-61 01-13-21 Unable to collect sample, water frozen.

SW D-99 01-13-21 Unable to collect sample, water frozen.

SW D-49 02-11-21 Unable to collect sample, water frozen.

SW D-50 02-11-21 Unable to collect sample, water frozen.

SW D-51 02-11-21 Unable to collect sample, water frozen.

SW D-61 02-11-21 Unable to collect sample, water frozen.

SW D-99 02-11-21 Unable to collect sample, water frozen.

TLD D-2 1st Qtr '21 TLD missing in field.

TLD D-83 1st Qtr '21 TLD missing in field.

Unable to collect water due to a power WW D-58 08-25-21 outage at the location.

Unable to collect water due to a power WW D-58 11-18-21 outage at the location.

TLD D-8 4th Qtr '21 TLD missing in field.

19

Table 5.7 Radiological Environmental Monitoring Program Summary.

Name of Facility Duane Arnold Energy Center Docket No. 50-331 Location of Facility Linn, Iowa Reporting Period January-December, 2021 Indicator Control Number Sample Type and Location with Highest Annual Mean Locations Locations Non-Type Number of LLD b Mean (F) c Mean (F) 0 Mean (F) c Routine (Units) Analyses a Location d Range 0 Range 0 Range c Results*

Airborne Pathway Airborne 0 Particulates GB 335 0.003 0.031 (283/283) D-40 0.035 (15/15) 0.028 (52/52)

(pCi/m )

3 (0.006-0.064) (0.006-0.060) (0.007-0.065)

GS 30 Be-7 0.210 0.087 (24/30) D-5A 0.092 (4/4) 0.073(4/4) 0 (0.064-0.117) (0.076-0.110) (0.051-0.102)

Mn-54 0.0062 <LLD <LLD 0 Fe-59 0.0398 <LLD - - <LLD 0

- - 0 Co-58 0.0111 <LLD - <LLD

- - <LLD 0 Co-60 0.0046 <LLD -

- - 0 Zn-65 0.0131 <LLD

<LLD Nb-95 0.0327 <LLD - - <LLD 0 Zr-95 0.0240 <LLD - - <LLD 0

- - 0 Ru-103 0.0304 <LLD - <LLD

- 0 Ru-106 0.0518 <LLD - - <LLD Cs-134 0.0060 <LLD - - <LLD 0

- - 0 Cs-137 0.0064 <LLD - <LLD

- 0 Ce-141 0.0682 <LLD - - <LLD Ce-144 <LLD

- - <LLD 0

0.0425 -

Airborne Iodine 1-131 335 0.030 0

<LLD - - <LLD (pCi/m 3)

Direct Radiation TLDs (mR/quarter)

Gamma 46 1.0 None D-5 17.4(4/4) 14.7 (47/47) 0 Control Locations (15.7-18.4) (11.5-18.4)

Within 0.5 mi. of Gamma 79 1.0 15.6 (79/79) D-28 None 0 18.5 (4/4)

Stack (9.8-20.9) (15.8-20.6)

Within 1.0 mi. of Gamma 24 1.0 17.2 (24/24) D-46 19.2 (4/4) None 0 Stack (13.0-20.6) (17.2-20.0)

Within 3.0 mi.of Gamma 40 1.0 D-38 17.5(4/4) None 0 15.1 (40/40)

Stack (11.0-19.2) (16.0-19.2) 37 .5 (16/16) D-161 59.4 (4/4) None ISFSI border Gamma 16 1.0 0 (16.6-63.1) (53.3-63.1) 20

Table 5.7 Radiological Environmental Monitoring Program Summary.

Name of Facility Duane Arnold Energy Center Docket No. 50-331 Location of Facility Linn, Iowa Reporting Period January-December, 2021 Indicator Location with Highest Annual Mean Control Number Sample Type and Locations Locations Non-Type Number of LLD b Mean (F) c Mean (F) 0 Mean (F) c Routine (Units) Analyses*

Range c Location d Range 0 Range c Results*

Waterborne Pathway Surface Water H-3 36 167 1335 (1/36) D-51 1335 (1/11) <LLD 0 (pCi/L) l-131chem 36 0.5 <LLD - - <LLD 0 Sr-89 8 0.77 <LLD - - <LLD 0 Sr-90 8 0.57 <LLD - - <LLD 0 GS 36 Mn-54 4.4 <LLD - - <LLD 0 Fe-59 9.5 <LLD - - <LLD 0 Co-58 4.2 <LLD - - <LLD 0 Co-60 4.0 <LLD - - <LLD 0 Zn-65 8.1 <LLD - - <LLD 0 Nb-95 6.9 <LLD - - <LLD 0 Zr-95 8.1 <LLD - - <LLD 0 1-131 9.7 <LLD - - <LLD 0 Cs-134 7.5 <LLD - - <LLD 0 Cs-137 6.1 <LLD - - <LLD 0 Ba-140 20.8 <LLD - - <LLD 0 La-140 16.6 <LLD - - <LLD 0 GS Sediments 5 Ci/gdry) D-51 8.45 (2/2) 7.78 (2/2) 0 7.36 (3/3)

K-40 1.0 (8.39-8.51) (7.35-8.21)

(5.18-8.51)

Mn-54 0.023 <LLD - - <LLD 0 Fe-59 0.065 <LLD - - <LLD 0 Co-58 0.022 <LLD - - <LLD 0 Co-60 0.013 <LLD - - <LLD 0 Zn-65 0.054 <LLD <LLD 0 Nb-95 0.043 <LLD - - <LLD 0 Zr-95 0.052 <LLD - - <LLD 0 Ru-103 0.035 <LLD - - <LLD 0 Ru-106 0.128 <LLD - - <LLD 0 Cs-134 0.018 <LLD - - <LLD 0 Cs-137 0.016 <LLD - - <LLD 0 Ce-141 0.066 <LLD <LLD Ce-144 0.137 <LLD

<LLD 0

0 21

Table 5.7 Radiological Environmental Monitoring Program Summary.

Name of Facility Duane Arnold Energy Center Docket No. 50-331 Location of Facility Linn, Iowa Reporting Period January-December, 2021 Indicator Location with Highest Annual Mean Control Number Sample Type and Locations Locations Non-Type Number of LLD b Mean (F) c Mean (F) c Mean (F) c Routine (Units) Analyses a Location d Range c Range c Range c Results e Waterborne Pathway Ground Water, 1-131 50 0.5 <LLD - - <LLD 0 potable (pCi/L)

H-3 50 167 <LLD - - <LLD 0 GS 50 Mn-54 6.1 <LLD - - <LLD 0 Fe-59 14.1 <LLD - - <LLD 0 Co-58 5.4 <LLD - - <LLD 0 Co-60 5.9 <LLD - - <LLD 0 Zn-65 10.3 <LLD - - <LLD 0 Nb-95 6.1 <LLD - - <LLD 0 Zr-95 11.1 <LLD - - <LLD 0 1-131 13.1 <LLD - - <LLD 0 Cs-134 9.3 <LLD - - <LLD 0 Cs-137 7.7 <LLD - - <LLD 0 Ba-140 31.5 <LLD - - <LLD 0 La-140 6.7 <LLD - - <LLD 0 Ingestion Pathway Broadleaf GS 4 Vegetation K-40 0.05 5.42 (4/4) D-58 6.58 (1/1) None 0 (pCi/gwet) (4.47-6.58) .. -

Mn-54 0.022 <LLD - - - 0 Fe-59 0.051 <LLD - - - 0 Co-58 0.019 <LLD - - - 0 Co-60 0.019 <LLD - - - 0 Zn-65 0.043 <LLD - - - 0 Nb-95 0.020 <LLD - - - 0 Zr-95 0.037 <LLD - - - 0 Ru-103 0.023 <LLD - - - 0 Ru-106 0.233 <LLD - - - 0 1-131 0.028 <LLD - - - 0 Cs-134 0.026 <LLD - - - 0 Cs-137 0.022 <LLD - - - 0 Ce-141 0.056 <LLD - - - 0 Ce-144 0.179 <LLD - - - 0 22

Table 5.7 Radiological Environmental Monitoring Program Summary.

Name of Facility Duane Arnold Energy Center Docket No. 50-331 Location of Facility Linn, Iowa Reporting Period January-December, 2021 (County, State)

Indicator Location with Highest Annual Mean Control Number Sample Type and Locations Locations Non-Type Number of LLD b Mean (F) c Mean (F) c Mean (F) c Routine (Units) Analyses a Location d Range c Range c Range c Results*

Ingestion Pathway (cont.)

GS 2 Vegetation (Grain and Forage) 0 K-40 0.05 8.31 (2/2) D-16 13.56 (1/1) None (pCi/gwet) (3.07-13.56)

Mn-54 0.014 <LLD - - 0 Fe-59 0.025 <LLD - - 0 Co-58 0.013 <LLD - - 0 Co-60 0.015 <LLD - - 0 Zn-65 0.026 <LLD - - 0 Nb-95 0.013 <LLD - - 0 Zr-95 0.027 <LLD - - 0 Ru-103 0.010 <LLD - - 0 Ru-106 0.121 <LLD - - 0 1-131 0.019 <LLD - - 0 Cs-134 0.013 <LLD - - 0 Cs-137 0.013 <LLD - - 0 Ce-141 0.021 <LLD - - 0 Ce-144 0.085 <LLD - - 0 GS 8 Fish (pCi/gwet) K-40 1.0 3.77 (4/4) D-61 3.63 (5/5) 3.36(4/4) 0 (3.53-3.96) (2.97-4.22) (3.09-3.66) 0 0.023 <LLD - - <LLD 0 Mn-54 0.063 <LLD - - <LLD 0 Fe-59 0

Co-58 0.022 <LLD - - <LLD 0.023 <LLD <LLD 0 Co-60 - -

0.056 0 Zn-65 <LLD

- - <LLD 0.028 0 Nb-95 <LLD

- - <LLD 0.060 0 Zr-95 <LLD

- - <LLD 0.047 0 Ru-103 <LLD

- - <LLD 0.227 0 Ru-106 <LLD

- - <LLD 0.029 <LLD <LLD 0 Cs-134 - -

0.021 0 Cs-137 <LLD

- - <LLD 0.056 0 Ce-141 <LLD

- - <LLD 0

0.190 Ce-144 <LLD

- - <LLD a GB= Gross beta; GS =Gamma spectroscopy b LLD= Nominal lower limit of detection based on 4.66 sigma counting error for the background sample.

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

d Locations are specified by: (1) Name and code (Table 5.3); and (2) distance, direction and sector relative to reactor site.

• Non-routine results are those which exceed ten times the control station value for the location. If a control station value is not available, the result is considered non-routine if it exceeds ten times the preoperational value for the location.

23

Figure 5.1 Radiological Environmental Monitoring Program Sampling Stations near the Duane Arnold Energy Center.

Figure 5-1 Environmental Monitoring Programs Sampling Near the Duane Arnold Energy Center trI

.. - - --*91 I

32 I

I I

I I

31 I

I I

I

~

I I

I I 113 I

29 I

I

[))

I 2.8 86 1..-----

GATE 2000feet 11}7 OAEC nt n IM m '" tN 111 .. 141 See Table 5.3 for sampling locations and Table 5.4 for Type and Frequency of collection.

24

Figure 5.2. Radiological Environmental Monitoring Program Sampling Stations Outside 0.5 Miles.

Figure 5-2 Radiological Environmental Monitoring Program Sampling Stations Outside 0.5 Miles from OAEC 34 35 04 Tl5 36 00 37 TOC:OYILU 38 *11 109 05c PALO~

110 ATKINS

• 10 See Table 5.3 for sampling locations and Table 5.4 for Type and Frequency of collection.

25

6.0 REFERENCES

CITED Arnold, J. R. and H. A. Al-Salih. 1955. Beryllium-? Produced by Cosmic Rays. Science 121: 451-453.

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

Environmental, Inc., Midwest Laboratory.

_ _ _2015 Study Plan, SP-DAEC-8001, rev1s1on 24 February 12, 2015, The Operational Radiological Environmental Monitoring Program for the Duane Arnold Energy Center, Cedar Rapids, Iowa

____ 2001 through 2020. Environmental Radiological Monitoring Program for the Duane Arnold Energy Center, Annual Report - Part II, Data Tabulations and Analyses, January - December, 2001 - 2020.

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

Environmental Radiological Monitoring Program for the Duane Arnold Energy Center, Annual Report

- Part II, Data Tabulations and Analyses, January - December, 1983 - 1999.

____ 1982 to 1984. (formerly Hazleton Environmental Sciences Corporation) Environmental Radiation Monitoring for the Duane Arnold Energy Center, Annual Report - Part II, Data Tabulations and Analyses, January - December 1981 -1983.

_ _ _2022. Quality Manual, Rev. 7, 15 January 2022.

____2012. Quality Assurance Program Manual, Rev. 3, 14 November2012.

____2020. Quality Control Procedures Manual, Rev. 4, 15 January 2020.

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

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

National Center for Radiological Health, 1968. Radiological Health and Data Reports, Vol. 9, Number 12, 730-746.

U. S. Department of Energy. 1978. Environmental Quarterly, Appendix E. Half-Life Tables, 1 January 1978, EML-334.

U. S. Nuclear Regulatory Commission. 1977. Regulatory Guide 1.109, Calculation of Annual Doses to Man from Routine Releases of Reactor Effluents for the Purpose of Evaluating Compliance with 10CFR Part 50, Appendix I.

Wilson, D. W., G. M. Ward and J. E. Johnson. 1969. In Environmental Contamination by Radioactive Materials, International Atomic Energy Agency. p.125.

26

~*L All Environmental, Inc.

7+~/"'\.I Midwest Laboratory 700 Landwehr Road* Northbrook, IL 60062-2310 phone (847) 564-0700 *fax (847) 564-4517 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, 2021 through December, 2021

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

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

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

Table A-2 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-3 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-4 lists results of the analyses on intralaboratory "blank" samples for the past twelve months. Data for previous years available upon request.

Table A-5 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-6 were obtained through participation in the Mixed Analyte Performance Evaluation Program.

Results in Table A-7 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 0.8to1.2 lodine-129, 0.8 to 1.2 lodine-131 Nickel-63, 0.7to1.3 Technetium-99, Uranium-238 lron-55 0.8 to 1.2 Other Analyses 0.8 to 1.2 A-2

2 TABLE A-1. lnterlaboratory Comparison Crosscheck program, Environmental Resource Associates (ERA) .

RAD study Concentration (pCi/L}

Lab Code Date Analysis Laboratory ERA Control Result Result Limits Acceptance RAD-124 Study ERW-94 1/11/2021 Ba-133 24.1 +/- 3.5 23.8 18.4 -27.4 Pass ERW-94 1/11/2021 Cs-134 46.1 +/- 3.1 42.8 34.2 - 47.1 Pass ERW-94 1/11/2021 Cs-137 154 +/- 6.0 148 133 - 165 Pass ERW-94 1/11/2021 Co-60 39.4 +/- 3.2 34.6 30.8 - 40.8 Pass ERW-94 1/11/2021 Zn-65 66.2 +/- 6.3 61.6 54.6 - 75.0 Pass ERDW-96 1/11/2021 Gr. Alpha 58.4 +/- 2.6 63.3 33.2 - 78.5 Pass ERDW-96 1/11/2021 Gr. Beta 38.1 +/- 1.3 39.8 26.4 - 47.3 Pass ERDW-98 1/11/2021 Ra-226 16.3 +/- 0.5 15.5 11.5 -17.8 Pass ERDW-98 1/11/2021 Ra-228 12.3+/-1.2 12.9 8.54 - 15.8 Pass ERDW-98 1/11/2021 Uranium 33.2+/-1.8 30.1 24.4 - 33.4 Pass ERW-100 1/11/2021 H-3 2,100 +/- 160 2,120 1,750 -2,350 Pass RAD-126 Study ERDW-2194 7/12/2021 Ba-133 44.1 +/-4.0 45.5 37.2 - 50.6 Pass ERDW-2194 7/12/2021 Cs-134 85.2 +/- 3.9 87.5 71.8 - 96.2 Pass ERDW-2194 7/12/2021 Cs-137 218 +/- 8 208 187 - 230 Pass ERDW-2194 7/12/2021 Co-60 91.7 +/-4.0 87.1 78.4 - 98.1 Pass ERDW-2194 7/12/2021 Zn-65 114 +/- 9 102 91.8 -122.0 Pass ERDW-2196 7/12/2021 Gr. Alpha 61.5 +/- 2.9 49.1 25.6 - 61.7 Pass ERDW-2196 7/12/2021 Gr. Beta 31.7+/-1.3 31.5 20.3 - 39.2 Pass ERDW-2200 7/12/2021 Ra-226 16.5 +/- 0.5 13.4 10.0 -15.4 Failb ERDW-2200 7/12/2021 Ra-228 8.7+/-1.0 7.6 4.81 - 9.7 Pass ERDW-2200 7/12/2021 Uranium 71.7+/-2.3 62.3 50.9 - 68.5 Failc ERDW-2202 7/12/2021 H-3 11,300 +/- 300 10,400 9,050 - 11,400 Pass ERDW-2198 7/12/2021 1-131 22.3+/-1.1 20.8 17.2 - 25.0 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 The radium-226 result did not meet ERA acceptance criteria.

c The uranium result did not meet ERA acceptance criteria.

A-3

TABLE A-2. Thermoluminescent Dosimetry, (TLD, CaS0 4 : Dy Cards)."

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

Environmental, Inc. Group 1 2021-1 11/8/2021 Spike 1 167.0 171.4 0.03 2021-1 11/8/2021 Spike 2 167.0 159.4 -0.05 2021-1 11/8/2021 Spike 3 167.0 160.8 -0.04 2021-1 11/8/2021 Spike 4 167.0 164.5 -0.01 2021-1 11/8/2021 Spike 5 167.0 156.7 -0.06 2021-1 11/8/2021 Spike 6 167.0 152.3 -0.09 2021-1 11/8/2021 Spike 7 167.0 158.7 -0.05 2021-1 11/8/2021 Spike 8 167.0 161.6 -0.03 2021-1 11/8/2021 Spike 9 167.0 152.4 -0.09 2021-1 11/8/2021 Spike 10 167.0 155.7 -0.07 2021-1 11/8/2021 Spike 11 167.0 158.8 -0.05 2021-1 11/8/2021 Spike 12 167.0 163.1 -0.02 2021-1 11/8/2021 Spike 13 167.0 162.2 -0.03 2021-1 11/8/2021 Spike 14 167.0 158.8 -0.05 2021-1 11/8/2021 Spike 15 167.0 173.5 0.04 2021-1 11/8/2021 Spike 16 167.0 158.7 -0.05 2021-1 11/8/2021 Spike 17 167.0 162.9 -0.02 2021-1 11/8/2021 Spike 18 167.0 159.3 -0.05 2021-1 11/8/2021 Spike 19 167.0 158.2 -0.05 2021-1 11/8/2021 Spike 20 167.0 161.7 -0.03 Mean (Spike 1-20) 160.5 -0.04 Passd Standard Deviation (Spike 1-20) 5.2 0.03 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*(1 O)Ka = 1.20 . mrem/cGy = 1000.

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

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

A-4

8 TABLE A-2. Thermoluminescent Dosimetry, (TLD, CaS0 4 : Dy Cards).

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

Environmental, Inc. Group 2 2021-2 11/8/2021 Spike 21 102.0 98.3 -0.04 2021-2 11/8/2021 Spike 22 102.0 88.4 -0.13 2021-2 11/8/2021 Spike 23 102.0 96.7 -0.05 2021-2 11/8/2021 Spike 24 102.0 101.4 -0.01 2021-2 11/8/2021 Spike 25 102.0 98.5 -0.03 2021-2 11/8/2021 Spike 26 102.0 96.3 -0.06 2021-2 11/8/2021 Spike 27 102.0 95.8 -0.06 2021-2 11/8/2021 Spike 28 102.0 94.3 -0.08 2021-2 11/8/2021 Spike 29 102.0 93.5 -0.08 2021-2 11/8/2021 Spike 30 102.0 95.7 -0.06 2021-2 11/8/2021 Spike 31 102.0 101.7 0.00 2021-2 11/8/2021 Spike 32 102.0 98.5 -0.03 2021-2 11/8/2021 Spike 33 102.0 96.7 -0.05 2021-2 11/8/2021 Spike 34 102.0 87.2 -0.15 2021-2 11/8/2021 Spike 35 102.0 89.7 -0.12 2021-2 11/8/2021 Spike 36 102.0 88.5 -0.13 2021-2 11/8/2021 Spike 37 102.0 85.4 -0.16 2021-2 11/8/2021 Spike 38 102.0 90.0 -0.12 2021-2 11/8/2021 Spike 39 102.0 90.9 -0.11 2021-2 11/8/2021 Spike 40 102.0 92.6 -0.09 Mean (Spike 21-40) 94.0 -0.08 Passd Standard Deviation (Spike 21-40) 4.7 0.05 Passd a TLD's were irradiated by the University of Wisconsin-Madison Radiation Calibration Laboratory following ANSI N13.37 protocol from a known air kerma rate. TLD's were read and the results were submitted by Environmental Inc. to the University of Wisconsin-Madison Radiation Calibration Laboratory for comparison to the delivered dose.

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

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

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

A-5

TABLE A-3. lntralaboratory "Spiked" Samples Concentration" Lab Codeb Date Analysis Laboratory results Known Control Ratio 2s,n=1c Activity Limitsd Acceptance Lab/Known SPW-55 1/8/2021 H-3 1,889 +/- 150 2,110 1,688 - 2,532 Pass 0.90 SPDW-62 1/11/2021 Gr. Alpha 34.3+/-1.7 64.9 34.0 - 80.4 Pass 0.53 SPDW-62 1/11/2021 Gr. Beta 9.2 +/- 0.8 8.9 3.6 - 17.4 Pass 1.04 SPW-131 1/19/2021 Sr-90 18.0+/-1.1 17.9 14.3 - 21.5 Pass 1.00 SPW-133 1/19/2021 H-3 1,842 +/- 150 2,110 1,688 - 2,532 Pass 0.87 SPW-188 1/18/2021 Ra-228 14.2 +/- 1.7 14.9 10.4-19.3 Pass 0.96 SPW-236 1/26/2021 Ra-228 12.2 +/- 1.9 15.3 10.7-19.9 Pass 0.80 SPW-305 2/5/2021 H-3 1,785 +/- 147 2,110 1,688 - 2,532 Pass 0.85 SPW-372 2/12/2021 H-3 1,742 +/- 145 2,110 1,688 - 2,532 Pass 0.83 SPW-526 3/5/2021 H-3 1,899 +/- 150 2,110 1,688 - 2,532 Pass 0.90 SPW-692 3/19/2021 H-3 1,953+/-151 2,110 1,688 - 2,532 Pass 0.93 SPW-694 1/4/2021 Ra-226 9.7 +/- 0.4 12.3 8.6 -16.0 Pass 0.79 SPW-800 3/30/2021 Ra-228 15.8 +/- 2.0 15.3 10.7 -19.9 Pass 1.03 SPW-802 3/31/2021 H-3 1,878 +/- 150 2,110 1,688 - 2,532 Pass 0.89 SPW-810 3/19/2021 Ra-226 11.4+/-0.3 12.3 8.6 -16.0 Pass 0.93 SPDW-30103 3/31/2021 Ra-226 13.5+/-0.4 12.3 8.6 -16.0 Pass 1.10 SPW-812 4/1/2021 H-3 2,005 +/- 155 2,110 1,688 - 2,532 Pass 0.95 SPW-919 4/7/2021 H-3 1,877 +/- 149 2,110 1,688 - 2,532 Pass 0.89 SPW-944 4/9/2021 Gr. Alpha 56.7 +/- 2.5 58.4 29.2 - 87.6 Pass 0.97 SPW-944 4/9/2021 Gr. Beta 35.1 +/- 1.3 38.1 30.5 - 45.7 Pass 0.92 SPW-1048 4/15/2021 H-3 1,915+/-152 2,110 1,688 - 2,532 Pass 0.91 SPW-1250 4/30/2021 H-3 2,015+/-154 2,110 1,688 - 2,532 Pass 0.95 SPW-1373 5/11/2021 Gr. Alpha 63.5 +/- 2.9 58.4 29.2 - 87.6 Pass 1.09 SPW-1373 5/11/2021 Gr. Beta 38.5+/-1.3 38.1 30.5 - 45.7 Pass 1.01 SPW-1377 5/11/2021 Sr-90 17.4+/-1.2 17.9 14.3 - 21.5 Pass 0.97 SPDW-30108 5/28/2021 H-3 2,222 +/- 161 2,110 1,688 - 2,532 Pass 1.05 SPDW-30125 5/13/2021 Ra-226 10.9 +/- 0.3 12.3 8.6 -16.0 Pass 0.89 SPDW-30118 6/4/2021 H-3 2,230 +/- 163 2,110 1,688 - 2,532 Pass 1.06 SPMl-1672 6/8/2021 Sr-90 14.2 +/- 0.9 13.6 10.9 -16.3 Pass 1.04 SPDW-30160 6/11/2021 Ra-226 11.4 +/- 0.3 12.3 8.6 -16.0 Pass 0.93 SPDW-30129 6/15/2021 H-3 2,238 +/- 162 2,110 1,688 - 2,532 Pass 1.06 SPDW-30134 6/18/2021 Gr. Alpha 17.9+/-1.4 23.5 11.8 - 35.3 Pass 0.76 SPDW-30134 6/18/2021 Gr. Beta 60.9+/-1.6 67.6 54.1 - 81.1 Pass 0.90 SPDW-30148 6/25/2021 Ra-228 15.1 +/- 2.9 15.3 10.7 -19.9 Pass 0.98 SPDW-30206 7/8/2021 Ra-226 12.7+/-0.4 12.3 8.6 -16.0 Pass 1.03 SPDW-3001 7/29/2021 Ra-226 11.6 +/- 0.3 12.3 8.6 -16.0 Pass 0.95

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

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

c Results are based on single determinations.

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

A-6

TABLE A-3. lntralaboratory "Spiked" Samples Concentration*

Lab Codeb Date Analysis Laboratory results Known Control Ratio 2s, n=1° Activity Limitsd Acceptance Lab/Known SPDW-30224 8/2/2021 Gr. Alpha 38.6 +/- 2.1 49.1 24.6 - 73.7 Pass 0.79 SPDW-30224 8/2/2021 Gr. Beta 27.8+/-1.2 31.5 25.2 - 37.8 Pass 0.88 SPDW-30226 8/13/2021 H-3 2,074 +/- 157 2,110 1,688 - 2,532 Pass 0.98 SPDW-30231 8/18/2021 Ra-228 14.5 +/- 2.2 15.3 10.7 - 19.9 Pass 0.95 SPW-2783 9/3/2021 Sr-90 18.9 +/- 1.2 17.1 13.7 - 20.5 Pass 1.10 SPDW-2785 9/3/2021 H-3 2,135 +/- 158 2,110 1,688 - 2,532 Pass 1.01 SPDW-2891 9/10/2021 H-3 2,159 +/- 160 2,110 1,688 - 2,532 Pass 1.02 SPDW-3115 9/17/2021 Ra-226 11.3 +/- 0.3 12.3 8.6 -16.0 Pass 0.92 SPDW-3036 9/23/2021 Ra-228 18.0 +/- 2.6 15.3 10.7 -19.9 Pass 1.17 SPDW-3223 9/28/2021 Ra-228 16.6 +/- 2.5 15.3 10.7 -19.9 Pass 1.08 SPDW-3288 9/29/2021 U-234 29.2+/-1.6 23.0 16.1 - 29.9 Pass 1.27 SPDW-3288 9/29/2021 U-238 28.2 +/- 1.6 23.2 16.3 - 30.2 Pass 1.21 SPDW-30276 9/29/2021 Ra-226 9.4 +/- 0.4 12.3 8.6 -16.0 Pass 0.76 SPDW-3157 10/1/2021 H-3 2,111+/-158 2,110 1,688 - 2,532 Pass 1.00 SPDW-3393 10/15/2021 H-3 2,184+/-161 2,110 1,688 - 2,532 Pass 1.04 SPDW-3604 10/28/2021 H-3 2,104+/-15 2,110 1,688 - 2 ,532 Pass 1.00 SPDW-30283 11/4/2021 Ra-226 11.7+/-0.3 12.3 8.6 -16.0 Pass 0.95 SPDW-3769 11/10/2021 H-3 2,026 +/- 156 2,110 1,688 - 2,532 Pass 0.96 SPDW-3860 11/18/2021 H-3 2,161 +/- 161 2,110 1,688 - 2,532 Pass 1.02 SPDW-30290 11/22/2021 Ra-226 12.0 +/- 0.3 12.3 8.6 -16.0 Pass 0.97 SPDW-3958 12/3/2021 H-3 2,126 +/- 160 2,110 1,688 - 2,532 Pass 1.01 SPW-3971 12/7/2021 Sr-90 19.0+/-1.2 17.1 13.7 - 20.5 Pass 1.11 SPDW-30287 12/9/2021 Ra-228 12.3+/-1.7 15.3 10.7 -19.9 Pass 0.80 SPDW-30295 12/16/2021 H-3 2,265 +/- 163 2,110 1,688 - 2,532 Pass 1.07 SPDW-30301 12/30/2021 H-3 2,055 +/- 163 2,110 1,688 - 2,532 Pass 0.97 SPDW-30307 12/13/2021 Ra-226 11.7+/-0.4 12.3 8.6 -16.0 Pass 0.95 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), Ml (milk), AP (air filter), SO (soil), VE (vegetation), CH (charcoal canister), F (fish), U (urine).

c Results are based on single determinations.

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

A-7

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

Lab Codeb Sample Date Analysisc Laboratory results (4.66cr) Acceptance Type LLD Activity Criteria (4.66 cr)

SPW-54 Water 1/8/2021 H-3 153 24 +/- 77 200 SPDW-61 Water 1/11/2021 Gr. Alpha 0.56 -0.32 +/- 0.37 2 SPDW-61 Water 1/11/2021 Gr. Beta 0.73 -0.11+/-0.49 4 SPW-130 Water 1/19/2021 Sr-89 0.66 -0.12 +/- 0.49 5 SPW-130 Water 1/19/2021 Sr-90 0.68 -0.02 +/- 0.31 1 SPW-132 Water 1/19/2021 H-3 165 38 +/- 79 200 SPW-4923 Water 1/26/2021 1-131 0.28 0.26+/-0.16 SPW-187 Water 1/18/2021 Ra-228 1.44 0.81 +/- 0.76 2 SPW-235 Water 1/26/2021 Ra-228 1.54 0.94 +/- 0.82 2 SPW-254 Water 2/2/2021 1-131 0.29 -0.06 +/- 0.13 SPW-304 Water 2/5/2021 H-3 159 6 +/- 74 200 SPW-371 Water 2/12/2021 H-3 154 -37 +/- 70 200 SPW-525 Water 3/5/2021 H-3 160 97 +/- 80 200 SPW-691 Water 3/19/2021 H-3 158 -38 +/- 71 200 SPW-693 Water 1/4/2021 Ra-226 0.03 -0.01 +/- 0.01 2 SPW-799 Water 3/30/2021 Ra-228 1.03 0.06 +/- 0.48 2 SPW-809 Water 3/19/2021 Ra-226 0.04 0.01 +/- 0.03 2 SPDW-30102 Water 3/31/2021 Ra-226 0.03 0.00 +/- 0.03 2 SPW-811 Water 4/1/2021 H-3 158 -29 +/- 77 200 SPW-918 Water 4/7/2021 H-3 156 93 +/- 79 200 SPW-943 Water 4/9/2021 Gr. Alpha 0.39 -0.08 +/- 0.27 2 SPW-943 Water 4/9/2021 Gr. Beta 0.73 0.04 +/- 0.51 4 SPW-1047 Water 4/15/2021 H-3 160 -51 +/- 74 200 SPW-1249 Water 4/30/2021 H-3 158 109 +/- 81 200 SPW-1372 Water 5/11/2021 Gr. Alpha 0.35 0.27 +/- 0.27 2 SPW-1372 Water 5/11/2021 Gr. Beta 0.68 0.27 +/- 0.49 4 SPW-1376 Water 5/11/2021 Sr-89 0.52 0.23 +/- 0.39 5 SPW-1376 Water 5/11/2021 Sr-90 0.51 -0.06 +/- 0.23 1 SPDW-30124 Water 5/13/2021 Ra-226 0.03 -0.02 +/- 0.03 2 SPDW-30104 Water 5/26/2021 Ra-228 1.30 -0.04 +/- 0.60 2 SPDW-30107 Water 5/28/2021 H-3 157 33 +/- 76 200 SPDW-30117 Water 6/4/2021 H-3 165 67 +/- 81 200 SPMl-1671 Milk 6/8/2021 Sr-89 0.46 0.23 +/- 0.42 5 SPMl-1671 Milk 6/8/2021 Sr-90 0.45 0.23 +/- 0.24 1 SPDW-30159 Water 6/11/2021 Ra-226 0.04 -0.02 +/- 0.04 2 SPDW-30128 Water 6/15/2021 H-3 161 17 +/- 76 200 SPDW-30133 Water 6/17/2021 1-131 0.20 0.06 +/- 0.12 1 SPDW-30134 Water 6/18/2021 Gr. Alpha 0.46 -0.11 +/- 0.32 2 SPDW-30134 Water 6/18/2021 Gr. Beta 0.70 -0.10 +/- 0.49 4 SPDW-30147 Water 6/25/2021 Ra-228 1.76 -0.15 +/- 0.80 2

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

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

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

d Activity reported is a net activity result.

A-8

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

Lab Codeb Sample Date Analysis 0 Laboratory results (4.66cr) Acceptance Type LLD Activity Criteria (4.66 cr)

SPDW-30205 Water 7/8/2021 Ra-226 0.03 0.02 +/- 0.03 2 SPDW-3000 Water 7/29/2021 Ra-226 0.03 0.03 +/- 0.03 2 SPDW-30223 Water 8/2/2021 Gr. Alpha 0.46 -0.13 +/- 0.31 2 SPDW-30223 Water 8/2/2021 Gr. Beta 0.70 0.16 +/-0.49 4 SPDW-30225 Water 8/13/2021 H-3 161 -2 +/- 75 200 SPDW-30230 Water 8/18/2021 Ra-228 1.02 0.47 +/- 0.53 2 SPW-2782 Water 9/3/2021 Sr-89 0.60 -0.16 +/- 0.48 5 SPW-2782 Water 9/3/2021 Sr-90 0.63 0.20 +/- 0.32 1 SPDW-2784 Water 9/3/2021 H-3 157 -50 +/- 69 200 SPDW-2890 Water 9/10/2021 H-3 163 -59 +/- 72 200 SPDW-2981 Water 9/17/2021 H-3 162 11 +/- 78 200 SPDW-3114 Water 9/17/2021 Ra-226 0.03 0.04 +/- 0.03 2 SPDW-3035 Water 9/23/2021 Ra-228 1.15 0.10 +/- 0.55 2 SPDW-3222 Water 9/28/2021 Ra-228 1.37 -0.30 +/- 0.60 2 SPDW-3287 Water 9/29/2021 U-234 0.22 0.19 +/- 0.23 1 SPDW-3287 Water 9/29/2021 U-238 0.38 -0.05 +/- 0.21 1 SPDW-30275 Water 9/29/2021 Ra-226 0.05 0.03 +/- 0.04 2 SPDW-3156 Water 10/1/2021 H-3 161 -11 +/- 75 200 SPDW-3289 Water 10/12/2021 Gr. Alpha 0.40 0.21 +/- 0.30 2 SPDW-3289 Water 10/12/2021 Gr. Beta 0.72 0.31 +/- 0.52 4 SPDW-3392 Water 10/15/2021 H-3 158 58 +/- 79 200 SPDW-3603 Water 10/28/2021 H-3 163 26 +/- 77 200 SPDW-30282 Water 11/4/2021 Ra-226 0.04 0.04 +/- 0.03 2 SPDW-3768 Water 11/10/2021 H-3 162 31 +/- 77 200 SPDW-3859 Water 11/18/2021 H-3 162 45 +/- 78 200 SPDW-30289 Water 11/22/2021 Ra-226 0.03 0.19 +/- 0.03 2 SPDW-3957 Water 12/3/2021 H-3 161 118 +/- 84 200 SPW-3970 Water 12/7/2021 Sr-89 0.54 -0.12 +/- 0.43 5 SPW-3970 Water 12/7/2021 Sr-90 0.54 0.08 +/- 0.26 SPDW-30286 Water 12/9/2021 Ra-228 0.91 -0.26 +/- 0.39 2 SPDW-30288 Water 12/10/2021 1-131 0.22 0.00 +/-0.12 1 SPDW-30306 Water 12/13/2021 Ra-226 0.05 -0.05 +/- 0.04 2 SPDW-30294 Water 12/16/2021 H-3 162 -33 +/- 73 200 SPDW-30300 Water 12/30/2021 H-3 166 68 +/- 91 200 3

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

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

0 1-131 (G); iodine-131 as analyzed by gamma spectroscopy.

d Activity reported is a net activity result.

A-9

TABLE A-5. lntralaboratory "Duplicate" Samples Concentration*

Averaged Lab Codeb Date Analysis First Result Second Result Result Acceptance S-20,21 1/5/2021 K-40 23.3 +/- 0.6 22.6 +/- 1.6 23.0 +/- 0.9 Pass XW-295,296 1/13/2021 H-3 245 +/- 87 288 +/- 89 267 +/- 62 Pass S-143, 144 1/14/2021 K-40 7.47 +/- 0.76 8.38 +/- 0.22 7.93 +/- 0.40 Pass S-360,361 2/10/2021 K-40 9.23 +/- 0.54 9.00 +/- 0.68 9.12 +/- 0.43 Pass S-406,407 2/15/2021 K-40 2.92 +/- 0.28 2.94 +/- 0.94 2.93 +/- 0.49 Pass W-469,470 2/22/2021 Ra-226 0.75 +/- 0.21 0.87 +/- 0.22 0.81 +/- 0.15 Pass W-448,449 2/25/2021 Gr. Alpha 3.52 +/- 1.84 3.72 +/- 1.87 3.62 +/- 1.31 Pass W-448,449 2/25/2021 Gr. Beta 8.71 +/- 1.36 8.91 +/- 1.40 8.81 +/- 0.98 Pass W-448,449 2/25/2021 Ra-226 1.87 +/- 0.25 1.82 +/- 0.28 1.85 +/- 0.19 Pass W-448,449 2/25/2021 Ra-228 2.65 +/- 1.26 2.53 +/- 1.35 2.59 +/- 0.92 Pass P-511,512 3/2/2021 H-3 198 +/- 85 202 +/- 86 200 +/- 60 Pass WW-630,631 3/10/2021 H-3 144 +/- 82 148 +/- 82 146 +/- 58 Pass WW-743,744 3/16/2021 H-3 183 +/- 85 167 +/- 84 175 +/- 60 Pass S-785,786 3/25/2021 Pb-214 0.59 +/- 0.08 0.34 +/- 0.05 0.47 +/- 0.05 Pass S-785,786 3/25/2021 Ac-228 0.61 +/- 0.12 0.58 +/- 0.13 0.60 +/- 0.09 Pass AP-1052,1053 3/30/2021 Be-7 0.081 +/- 0.010 0.075 +/- 0.011 0.078 +/- 0.007 Pass AP-966,967 3/30/2021 Be-7 0.080 +/- 0.010 0.085 +/- 0.009 0.083 +/- 0.007 Pass SWU-835,836 3/30/2021 Gr. Beta 1.22 +/- 0.56 1.27 +/- 0.55 1.24 +/- 0.39 Pass AP-1204,1205 3/30/2021 Be-7 0.187 +/- 0.102 0.160 +/- 0.088 0.173 +/- 0.067 Pass AP-1029,1030 4/2/2021 Be-7 0.067 +/- 0.012 0.079 +/- 0.012 0.073 +/- 0.009 Pass SW-922,923 4/7/2021 H-3 440 +/- 99 307 +/- 93 373 +/- 68 Pass WW-987,988 4/12/2021 H-3 190 +/- 87 284 +/- 92 237 +/- 63 Pass F-1246,1247 4/22/2021 K-40 3.26 +/- 0.66 2.83 +/- 0.46 3.04 +/- 0.40 Pass SWT-1311,1312 4/27/2021 Gr. Beta 1.05 +/- 0.52 1.16 +/- 0.55 1.10 +/- 0.38 Pass WW-1401, 1402 5/5/2021 Gr. Alpha 1.10+/-1.00 2.50 +/- 1.20 1.80 +/- 0.78 Pass WW-1401, 1402 5/5/2021 K-40 126 +/- 15 105 +/- 30 115+/-17 Pass DW-30071.,30072 5/6/2021 Ra-226 0.98 +/-0.15 0.67 +/- 0.13 0.83+/-0.10 Pass DW-30071.,30072 5/6/2021 Ra-228 0.83 +/- 0.51 1.21 +/- 0.54 1.02 +/- 0.37 Pass DW-30078,30079 5/10/2021 Gr. Alpha 4.90 +/- 0.92 5.92 +/- 0.99 5.41 +/- 0.68 Pass AP-051120A,B 5/11/2021 Gr. Beta 0.006 +/- 0.002 0.005 +/- 0.002 0.005 +/- 0.002 Pass DW-30083,30084 5/11/2021 Ra-226 0.34 +/- 0.13 0.19 +/-0.20 0.27 +/-0.12 Pass DW-30083,30084 5/11/2021 Ra-228 0.98 +/- 0.60 0.15 +/- 0.56 0.57 +/- 0.41 Pass S-1506, 1507 5/18/2021 K-40 10.1+/-0.8 14.9 +/- 1.2 12.5 +/- 0.7 Pass DW-30092,30093 5/20/2021 Gr. Alpha 2.86 +/- 0.85 2.40 +/- 0.90 2.63 +/- 0.62 Pass DW-30095,30096 5/21/2021 Ra-226 1.18 +/- 0.16 0.73 +/- 0.15 0.96+/-0.11 Pass DW-30095,30096 5/21/2021 Ra-228 1.44 +/- 0.63 0.61 +/- 0.59 1.03 +/- 0.43 Pass AP-052521A,B 5/25/2021 Gr. Beta 0.021 +/- 0.003 0.022 +/- 0.003 0.021 +/- 0.002 Pass S-1589,1590 5/28/2021 Pb-214 1.16 +/- 0.08 1.06 +/- 0.09 1.11 +/- 0.06 Pass S-1589,1590 5/28/2021 Ac-228 1.17 +/- 0.18 1.08 +/- 0.14 1.13 +/- 0.11 Pass A-10

TABLE A-5. lntralaboratory "Duplicate" Samples Concentration*

Averaged Lab Codeb Date Analysis First Result Second Result Result Acceptance AP-060121A,B 6/1/2021 Gr. Beta 0.015 +/- 0.003 0.013 +/- 0.003 0.014 +/- 0.002 Pass DW-30113,30114 6/1/2021 Ra-226 2.00 +/- 0.34 2.64 +/- 0.26 2.32 +/- 0.21 Pass DW-30113,30114 6/1/2021 Ra-228 2.50 +/- 0.78 3.13 +/- 0.82 2.82 +/- 0.57 Pass PS-1631,1632 6/2/2021 K-40 21.1 +/- 0.8 20.4 +/- 0.8 20.7 +/- 0.6 Pass DW-30119,30120 6/3/2021 Gr. Alpha 1.18 +/- 0.75 0.66 +/- 0.64 0.92 +/- 0.49 Pass WW-1908, 1909 6/4/2021 H-3 150 +/- 85 176 +/- 87 163 +/- 61 Pass VE-1717,1718 6/7/2021 Be-7 0.50 +/- 0.19 0.38 +/- 0.14 0.44 +/- 0.12 Pass VE-1717,1718 6/7/2021 K-40 5.26 +/- 0.47 5.45 +/- 0.44 5.35 +/- 0.32 Pass AP-060821 A,B 6/8/2021 Gr. Beta 0.030 +/- 0.004 0.028 +/- 0.004 0.029 +/- 0.003 Pass AP-1822,1823 6/10/2021 Be-7 0.23 +/- 0.12 0.22 +/- 0.12 0.22 +/- 0.08 Pass CF-1844,1845 6/14/2021 K-40 8.37 +/- 0.44 8.33 +/- 0.35 8.35 +/- 0.28 Pass AP-061521A,B 6/15/2021 Gr. Beta 0.020 +/- 0.004 0.017 +/- 0.003 0.019 +/- 0.002 Pass DW-30131,30132 6/17/2021 Ra-226 0.41 +/- 0.21 0.34 +/- 0.23 0.38 +/- 0.16 Pass DW-30131,30132 6/17/2021 Ra-228 0.42 +/- 0.85 0.52 +/- 0.74 0.47 +/- 0.56 Pass DW-30138,30139 6/17/2021 Gr. Alpha 1.59 +/- 0.84 2.21 +/- 0.95 1.90 +/- 0.63 Pass S-1929,1930 6/22/2021 K-40 19.4+/-1.0 19.2 +/- 1.1 19.3 +/- 0.7 Pass AP-062221A,B 6/22/2021 Gr. Beta 0.014 +/- 0.003 0.012 +/- 0.028 0.013 +/- 0.014 Pass DW-30150,30151 6/28/2021 Ra-226 0.53 +/-0.15 0.55 +/-0.19 0.54+/-0.12 Pass DW-30150,30151 6/28/2021 Ra-228 0.76 +/- 0.54 0.52 +/- 0.52 0.64 +/- 0.37 Pass AP-2160,2161 6/28/2021 Be-7 0.11 +/- 0.01 0.11 +/- 0.01 0.11 +/- 0.01 Pass DW-30150,30151 6/28/2021 Ra-226 0.53 +/- 0.15 0.55 +/- 0.19 0.54 +/- 0.12 Pass DW-30150,30151 6/28/2021 Ra-228 0.76 +/- 0.54 0.52 +/- 0.52 0.64 +/- 0.37 Pass AP-2218,2119 6/29/2021 Be-7 0.11 +/- 0.01 0.12 +/- 0.01 0.11 +/- 0.01 Pass AP-2235,2236 6/30/2021 Be-7 0.10 +/- 0.01 0.11 +/- 0.01 0.10 +/- 0.01 Pass CF-2139,2140 7/12/2021 Be-7 0.49 +/- 0.12 0.65 +/- 0.20 0.57 +/- 0.12 Pass CF-2139,2140 7/12/2021 K-40 8.25 +/-0.41 7.94 +/- 0.46 8.10 +/- 0.31 Pass VE-2214,2215 7/12/2021 K-40 3.26 +/- 0.11 3.41 +/- 0.25 3.34 +/- 0.14 Pass DW-30169,30170 7/12/2021 Gr. Alpha 2.61 +/- 0.87 2.09 +/- 0.84 2.35 +/- 0.60 Pass DW-30169,30170 7/12/2021 Gr. Beta 2.09 +/- 0.67 2.52 +/- 0.60 2.31 +/- 0.45 Pass DW-30169,30170 7/12/2021 Ra-226 0.84 +/- 0.24 0.82 +/- 0.20 0.83+/-0.16 Pass DW-30169,30170 7/12/2021 Ra-228 0.80 +/- 0.54 0.84 +/- 0.50 0.82 +/- 0.37 Pass AP-71320,71321 7/13/2021 Gr. Beta 0.015 +/- 0.003 0.010 +/- 0.003 0.013 +/- 0.002 Pass XW-2424,2425 7/16/2021 H-3 193 +/- 86 104 +/- 81 149 +/- 59 Pass DW-30183,30184 7/19/2021 Ra-226 1.37 +/- 0.18 1.21 +/- 0.27 1.29 +/- 0.16 Pass DW-30183,30185 7/19/2021 Ra-228 1.51 +/- 0.69 1.52 +/- 0.68 1.52 +/- 0.48 Pass AP-71920,71921 7/19/2021 Gr. Beta 0.021 +/- 0.004 0.020 +/- 0.003 0.021 +/- 0.002 Pass S-2277,2278 7/20/2021 K-40 13.6 +/- 0.9 12.3 +/- 0.9 12.9 +/- 0.6 Pass DW-30191,30192 7/20/2021 Gr. Alpha 3.88 +/- 0.94 3.66 +/- 94.00 3.77 +/- 47.00 Pass SG-2382,2383 7/23/2021 Pb-214 1.88 +/- 0.21 1.94 +/- 0.21 1.91 +/- 0.15 Pass SG-2382,2383 7/23/2021 Ac-228 1.69 +/- 0.28 1.96 +/- 0.33 1.83 +/- 0.22 Pass DW-30207 ,30208 7/26/2021 Gr. Alpha 5.47+/-1.29 5.20 +/- 1.24 5.34 +/- 0.89 Pass DW-30207 ,30208 7/26/2021 Gr. Beta 5.89 +/- 0.77 6.11+/-0.73 6.00 +/- 0.53 Pass A-11

TABLE A-5. lntralaboratory "Duplicate" Samples Concentration a Averaged Lab Codeb Date Analysis First Result Second Result Result Acceptance DW-30210,30211 7/28/2021 Ra-226 0.48 +/-0.13 0.62+/-0.11 0.55 +/- 0.09 Pass DW-30210,30211 7/28/2021 Ra-228 0.45 +/- 0.53 0.73 +/- 0.65 0.59 +/- 0.42 Pass S-2509,2510 8/1/2021 K-40 14.2 +/- 0.5 13.7+/-1.0 14.0 +/- 0.6 Pass S-2509,2510 8/1/2021 Be-7 7.27 +/- 0.29 7.97 +/- 0.69 7.62 +/- 0.37 Pass DW-30221,30222 8/6/2021 Gr. Alpha 2.19 +/- 1.55 2.08 +/- 1.54 2.14+/-1.09 Pass DW-30221,30222 8/6/2021 Gr. Beta 1.19+/-1.04 2.76 +/- 1.08 1.98 +/- 0.75 Pass DW-30221,30222 8/6/2021 Ra-226 2.00 +/- 0.22 1.58 +/- 0.26 1.79 +/- 0.17 Pass DW-30221,30222 8/6/2021 Ra-228 1.69 +/- 0.56 1.75 +/- 0.54 1.72 +/- 0.39 Pass VE-2551,2552 8/11/2021 K-40 2.68 +/- 0.20 2.61 +/- 0.27 2.64 +/-0.17 Pass VE-2551,2552 8/11/2021 Be-7 0.16 +/- 0.08 0.18+/-0.08 0.17 +/- 0.05 Pass AP-2578,2579 8/12/2021 Be-7 0.18 +/- 0.09 0.20 +/- 0.11 0.19 +/- 0.07 Pass AP-082421A,B 8/24/2021 Gr. Beta 0.032 +/- 0.004 0.028 +/- 0.004 0.030 +/- 0.003 Pass AP-083121A,B 8/24/2021 Gr. Beta 0.027 +/- 0.004 0.029 +/- 0.004 0.028 +/- 0.003 Pass VE-2684,2685 8/25/2021 K-40 2.15 +/-0.26 1.92 +/- 0.27 2.03 +/- 0.19 Pass VE-2684,2685 8/25/2021 Be-7 0.20 +/- 0.10 0.26 +/- 0.11 0.23 +/- 0.07 Pass VE-2728,2729 8/25/2021 K-40 2.34 +/- 0.41 2.27 +/- 0.40 2.31 +/- 0.29 Pass DW-30238,30239 8/25/2021 Gr. Alpha 3.94 +/- 0.91 2.43 +/- 0.86 3.185 +/- 0.63 Pass DW-30238,30239 8/25/2021 Ra-226 2.57 +/- 0.24 1.83 +/- 0.24 2.20 +/- 0.17 Pass DW-30238,30239 8/25/2021 Ra-228 2.86 +/- 0.83 2.52 +/- 0.66 2.69 +/- 0.53 Pass SW-2641,2642 8/31/2021 H-3 289 +/- 92 310 +/- 93 300 +/- 65 Pass VE-2858,2859 9/2/2021 K-40 8.36 +/- 0.41 8.02 +/- 0.47 8.19 +/- 0.31 Pass SG-2934,2935 9/13/2021 Pb-214 2.72 +/- 0.22 2.54 +/- 0.27 2.63 +/- 0.17 Pass SG-2934,2935 9/13/2021 Ac-228 3.16 +/-0.39 3.22 +/- 0.58 3.19 +/- 0.35 Pass DW-30249,30250 9/17/2021 Ra-226 0.70 +/- 0.18 1.00 +/- 0.17 0.85+/-0.12 Pass S-3042,3043 9/22/2021 K-40 7.55 +/- 0.80 7.57 +/- 0.81 7.56 +/- 0.57 Pass DW-30249,30250 9/17/2021 Ra-226 0.70 +/- 0.18 1.00+/-0.17 0.85 +/- 0.12 Pass S-3042,3043 9/22/2021 K-40 7.55 +/- 0.80 7.57 +/- 0.81 7.56 +/- 0.57 Pass DW-30256,30257 10/8/2021 Gr. Alpha 2.35 +/- 0.79 2.71 +/- 0.92 2.53 +/- 0.61 Pass S-3279,3280 10/11/2021 K-40 10.08 +/- 0.58 9.18 +/- 0.53 9.63 +/- 0.39 Pass DW-30262,30263 10/14/2021 Ra-226 1.49 +/- 0.30 1.51 +/- 0.17 1.50 +/-0.17 Pass DW-30262,30263 10/14/2021 Ra-228 1.16 +/- 0.79 2.08 +/- 0.82 1.62 +/- 0.57 Pass AP-102521A,B 10/25/2021 Gr. Beta 0.026 +/- 0.005 0.030 +/- 0.010 0.028 +/- 0.010 Pass XWW-3707 ,3708 10/27/2021 H-3 206 +/- 87 268 +/- 90 237 +/- 63 Pass AP-110121A,B 11/1/2021 Gr. Beta 0.017 +/- 0.004 0.016 +/- 0.00 0.016 +/- 0.003 Pass DW-30277 ,30278 11/5/2021 Gr. Alpha 10.11+/-1.19 9.72+/-1.11 9.92 +/- 0.81 Pass DW-30277,30278 11/5/2021 Gr .Beta 5.53 +/- 0.72 4.22 +/- 0.69 4.88 +/- 0.50 Pass DW-30277 ,30278 11/5/2021 Ra-226 6.27 +/- 0.32 6.34 +/- 0.37 6.31 +/- 0.25 Pass DW-30277 ,30278 11/5/2021 Ra-228 3.10 +/- 0.86 3.76 +/- 0.90 3.43 +/- 0.62 Pass AP-111521A,B 11/15/2021 Gr. Beta 0.022 +/- 0.004 0.026 +/- 0.005 0.024 +/- 0.003 Pass AP-112221A,B 11/22/2021 Gr. Beta 0.023 +/- 0.004 0.025 +/- 0.005 0.024 +/- 0.003 Pass AP-112921A,B 11/29/2021 Gr. Beta 0.038 +/- 0.005 0.035 +/- 0.005 0.037 +/- 0.004 Pass A-12

TABLE A-5. lntralaboratory "Duplicate" Samples Concentration*

Averaged Lab Codeb Date Analysis First Result Second Result Result Acceptance DW-30297,8 12/15/2021 Ra-226 1.71+/-0.15 1.21 +/-0.13 1.46+/-0.10 Pass DW-30297,8 12/15/2021 Ra-228 2.44 +/- 0.98 1.96 +/- 0.97 2.20 +/- 0.69 Pass S-4182,4183 12/19/2021 Pb-214 1.19 +/- 0.06 1.07 +/- 0.08 1.13 +/- 0.05 Pass S-4182,4183 12/19/2021 Ac-228 1.08 +/- 0.11 1.15+/-0.14 1.12 +/-0.09 Pass S-4182,4183 12/19/2021 K-40 1.75 +/- 0.74 1.80 +/- 0.84 1.78+/-0.56 Pass AP-122721A,B 12/27/2021 Gr. Beta 0.063 +/- 0.006 0.060 +/- 0.006 0.062 +/- 0.004 Pass AP-4350,4351 12/28/2021 Be-7 0.06 +/- 0.02 0.06 +/- 0.02 0.06 +/- 0.01 Pass AP-4845,4846 12/31/2021 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),

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

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

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

A-13

TABLE A-6. Department of Energy's Mixed Analyte Performance Evaluation Program (MAPEP).

Concentration" Reference Known Control Lab Code b Date Analysis Laboratory result Activity Limits c Acceptance MAAP-594 2/1/2021 Gross Alpha 1.30 +/- 0.08 1.77 0.53 - 3.01 Pass MAAP-594 2/1/2021 Gross Beta 0.81 +/- 0.04 0.649 0.325 - 0.974 Pass MADW-571 2/1/2021 Gross Alpha 0.73 +/- 0.06 0.87 0.26 - 1.48 Pass MADW-572 2/1/2021 Gross Beta 2.38 +/- 0.06 2.50 1.25 -3.75 Pass MAS0-591 2/1/2021 Cs-134 -2.57 +/- 2.21 0 NA c Pass MAS0-591 2/1/2021 Cs-137 1700 +/- 20 1550 1085 - 2015 Pass MAS0-591 2/1/2021 Co-57 977 +/- 7 920 644 - 1196 Pass MAS0-591 2/1/2021 Co-60 1360 +/- 10 1370 959 - 1781 Pass MAS0-591 2/1 /2021 Mn-54 0.91 +/- 2.85 0 NA c Pass MAS0-591 2/1/2021 Zn-65 687 - 17 604 423 - 785 Pass MAS0-591 2/1 /2021 K-40 682 +/- 53 618 433 - 803 Pass MAW-569 2/1 /2021 Cs-134 10.5 +/- 0.3 11.5 8.1 -15.0 Pass MAW-569 2/1 /2021 Cs-137 8.53 +/- 0.32 7.9 5.5 -10.3 Pass MAW-569 2/1 /2021 Co-57 12.2 +/- 0.3 11.4 8.0 - 14.8 Pass MAW-569 2/1/2021 Co-60 0.03 +/- 0.05 0 NAC Pass MAW-569 2/1/2021 Mn-54 16.5 +/- 0.4 15.5 10.9 - 20.2 Pass MAW-569 2/1/2021 Zn-65 11.5 +/- 0.5 10.5 7.40 - 13.7 Pass MAW-569 2/1/2021 K-40 9.93 +/- 1.42 0 NA c Fail d MAAP-592 2/1/2021 Cs-134 1.54 +/- 0.06 2.14 1.50 - 2.78 Pass MAAP-592 2/1 /2021 Cs-137 -0.011 +/- 0.020 0 NAC Pass MAAP-592 2/1 /2021 Co-57 0.636 +/- 0.042 0.69 0.480 - 0.892 Pass MAAP-592 2/1 /2021 Co-60 -0.64 +/- 0.02 0 NAC Fail e MAAP-592 2/1 /2021 Mn-54 0.312 +/- 0.058 0.312 0.218 - 0.406 Pass MAAP-592 2/1 /2021 Zn-65 0.41 +/- 0.07 0.352 0.246 - 0.458 Pass MAVE-588 2/1/2021 Cs-134 3.73 +/- 0.09 3.60 2.50 - 4.70 Pass MAVE-588 2/1/2021 Cs-137 5.69 +/- 0.10 4.69 3.28 - 6.10 Pass MAVE-588 2/1/2021 Co-57 6.23 +/- 0.07 5.05 3.54 - 6.57 Pass MAVE-588 2/1/2021 Co-60 3.29 +/- 0.06 2.99 2.09 - 3.89 Pass MAVE-588 2/1 /2021 Mn-54 6.17 +/- 0.16 5.25 3.68 - 6.83 Pass MAVE-588 2/1 /2021 Zn-65 -0.04 +/- 0.08 0 NA c Pass MAAP-3007 8/1/2021 Gross Alpha 0.45 +/- 0.04 0.960 0.288 - 1.632 Pass MAAP-3007 8/1 /2021 Gross Beta 0.71 +/- 0.04 0.553 0.277 - 0.830 Pass MADW-2688 8/1/2021 Gross Alpha 0.19 +/- 0.03 0.232 0.070 - 0.394 Pass MADW-2688 8/1/2021 Gross Beta 2.60 +/- 0.06 2.807 1.404 - 4.211 Pass A-14

TABLE A-6. Department of Energy's Mixed Analyte Performance Evaluation Program (MAPEP).

Concentration a Reference Known Control Lab Code b Date Analysis Laboratory result Activity Limits c Acceptance MAS0-3004 8/1/2021 Cs-134 1035 +/- 10 1170 819 -1521 Pass MAS0-3004 8/1/2021 Cs-137 628 +/- 11 572 400 - 744 Pass MAS0-3004 8/1/2021 Co-57 -0.11 +/- 1.26 0 NA c Pass MAS0-3004 8/1/2021 Co-60 720 +/- 7 722 714 - 1326 Pass MAS0-3004 8/1/2021 Mn-54 456 +/- 11 410 287 - 533 Pass MAS0-3004 8/1/2021 Zn-65 1002 +/- 22 907 635 - 1179 Pass MAS0-3004 8/1/2021 K-40 663 +/- 50 607 425 - 789 Pass MADW-3003 8/1/2021 Ra-226 0.32 +/- 0.06 0.226 0.158 -0.294 Fail1 MADW-3003 8/1/2021 Sr-90 3.63 +/-0.16 3.9 2.70 - 5.02 Pass MADW-3003 8/1/2021 U-234 0.02 - 0.01 0.02 NA 9 Pass MADW-3003 8/1/2021 U-238 0.02 - 0.01 0.01 NA 9 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.

ct The sample spectrum was reanalyzed utilizing the minimum data point background width method. The result was 1.59 +/- 1. 77 Bq/L which satisfies MAPEP criteria for a false positive test.

0 A decimal was misplaced in one of two cobalt-60 results while calculating a mean result causing MAPEP to fail the result as a statistically significant negative value at 3 standard deviations. The correct mean result (-0.0004 +/- 0.0186) is not a statistically significant negative value and would not have failed.

f Radium result did not meet MAPEP acceptance criteria.

9 Provided in the series for "sensitivity evaluation". MAPEP does not provide control limits.

A-15

TABLE A-7. lnterlaboratory Comparison Crosscheck Program, Environmental Resource Associates (ERA)*.

MRAD-30 Study Concentration a Lab Code b Date Analysis Laboratory ERA Control Result Value c Limits d Acceptance ERAP-722 3/22/2021 Cs-134 898 1030 668 - 1260 Pass ERAP-722 3/22/2021 Cs-137 181 163 134 - 214 Pass ERAP-722 3/22/2021 Co-60 1270 1220 1040 - 1550 Pass ERAP-722 3/22/2021 Mn-54 < 4.3 < 50.0 0.00 - 50.0 Pass ERAP-722 3/22/2021 Zn-65 908 771 632 - 1180 Pass ERAP-722 3/22/2021 Sr-90 184 189 120 - 257 Pass ERAP-724 3/22/2021 Gross Alpha 88.4 96.1 50.2 - 158 Pass ERAP-724 3/22/2021 Gross Beta 74.1 62.6 38.0 - 94.6 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 (OAP)

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

A-16

~*L. All Environmental, Inc.

'+~Ml Midwest Laboratory 700 Landwehr Road* Northbrook, IL 60062-2310 phone (847) 564-0700 *fax (847) 564-4517 Appendix B Data Reporting Conventions

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

2.0. Single Measurements Each single measurement is reported as follows: x +/-s where: x = value of the measurement; s = 2cr counting uncertainty (corresponding to the 95% confidence level).

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

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

3.1 Individual results: For two analysis results; x 1 +/- s1 and x2 +/- s2 Reported result: x +/- s; where x = (1/2) (x 1 + x2 ) ands= (1/2) ~ s~ + si 3.2. Individual results: < L1 , < L2 Reported result: < L, where L = lower of L1 and L2 3.3. Individual results: x +/- s, < L Reported result: x +/- s if x ;:: L; < L otherwise.

4.0. Computation of Averages and Standard Deviations 4.1 Averages and standard deviations listed in the tables are computed from all of the individual measurements over the period averaged; for examp~e, an annual standard deviation would not be the average of quarterly standard deviations. The average x and standard deviation "s" of a set of n numbers x 1 , x2 . . . x0 are defined as follows:

- 1 x =;; :Lx _ '\/:L (x- ~ > 2 s- n-1 4.2 Values below the highest lower limit of detection are not included in the average.

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

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

4.5 In rounding off, the following rules are followed:

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

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

8-1

~*£. All E11vironmental, Inc.

~.~/-'\.I Midwest Laboratory 700 Landwehr Road* Northbrook, IL 60062-2310 phone (847) 564-0700 *fax (847) 564-4517 Appendix C Maximum permissible concentrations of radioactivity in air and water above natural background in unrestricted areas

APPENDIX C Table C-1. Maximum permissible concentrations of radioactivity in air and water above natural 8

background in unrestricted areas .

3 Air (pCi/m ) Water (pCi/L) 3 Gross alpha 1 x 10- Strontium-89 8,000 Gross beta 1 Strontium-90 500 1

lodine-131b 2.8x10- Cesium-137 1,000 Barium-140 8,000 lodine-131 1,000 Potassium-40 c 4,000 Gross alpha 2 Gross beta 10 6

Tritium 1x10 a Taken from Table 2 of Appendix B to Code of Federal Regulations Title 10, Part 20, and appropriate footnotes.

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

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

c A natural radionuclide.

C-1

APPENDIX D

SUMMARY

OF THE LAND USE CENSUS AND REMP-GWPP DATA D-1

Appendix D Summary of the 2021 Land Use Census and REMP-GWPP Data Executive Summary The 2021 Radiological Environmental Monitoring Program (REMP) and Groundwater Protection Program (GWPP) sample locations and results were reviewed. There were no indications of any DAEC plant by-product in any REMP air, soil, river bed sediment, vegetation, meat, surface-water, and drinking water sample. GWPP sampling and results indicate tritiated groundwater remains within the owner controlled area and tritium concentrations in the SE sector continue to decline due to the combination of temporary and permanent groundwater mitigation. Post shutdown, the DAEC REMP-GWPP will remain necessary for 2021 and beyond. Defueled Offsite Dose Assessment Manual (DODAM) was revised to reduce environmental sampling consistent with the plant's operational condition.

Evaluation The Duane Arnold Energy Center Land Use Census was completed during December 2021. Residences, cattle, and gardens greater than 500 square feet were identified within three miles for each of the 16 meteorological sectors. If none were identified within three mile range, additional surveys were performed out to a distance of five miles. Meteorological sectors were identified using Google Earth and digital compass rose overlay for accuracy and precision. The 2021 Land Use Census details can be found in Attachment 1.

Milk sampling was discontinued in 2021. The 2020 Land Use Census did not identify dairies within ten miles of the plant and removed the requirement from the DODAM. The Land Use Census will discontinue assessing dairies and goats as radioactive iodine has decayed and is no longer a concern.

A list of nearest livestock can be found on Attachment 2.

There were two nearest resident changes in the SSW sector and WSW sector. A list of the nearest residential property can be found in Attachment 3.

There are nine new residences added to the 2021 Land Use Survey. A list of new residences can be found in Attachment 4. (complete attachment 4)

D-2

One meteorological sector, WSW, had a garden change and a list of the nearest gardens can be found in Attachment 5. Seven farmers/residents provided vegetation samples including the two closets neighbors to DAEC, D-58 and D-57. Vegetation providers are found in ODAM, Table 5-1. Subsequent vegetation analysis did not identify any DAEC plant by-product. Gardens were identified using Google Earth, and field observations.

Soil sampling on July 06, 2020, from D-15a and D-16., both of which identified Cesium-137 below reporting level of 180 pCi/g. A 2017-2018 soil sampling and evaluation at multiple locations near Waterloo, Ames, and Coralville, Iowa confirm the Cesium-137 is not from DAEC operations and Cs-137 can be attributed to weapons testing in the 1950-1960's.

Six Cedar River bed sediment samples were collected at D-49, D-51, and D-107a. No reactor by-product material was identified. Cs-137 was identified in past samples. The likely source of the Cs-137 is weapons testing in the 1950's-1960's and not from DAEC plant operations or plant by-product.

No meat samples were collected in 2020. However, a review of particulate and iodine sample results, indicates no deposition of radioactive material was likely.

Precipitation sampling has been discontinued. Given tritium trends in precipitation sample and regulatory guidance, sampling was discontinued.

310 groundwater samples were collected in 2020 and tritium wase the only plant by-product nuclide identified in the samples. The highest concentration identified in a monitoring well was 51,271 pCi/L on 10/13/2020 from monitoring well MW-08A, which is upstream of the temporary and permanent mitigation systems. Subsequent sampling and analysis confirm the tritium concentration in MW-08A decreased by 94% after continued mitigation operations. Since 10/13/2020, tritium in MW-08A has been consistently below 20,000 pCi/L. Monitoring wells MW-22A and MW-23A continue to have elevated tritium concentrations. Tritium was not identified in monitoring well MW-33A, which is the closet shallow monitoring well nearest the Cedar River. Therefore, the tritiated groundwater in the shallow appears to remain within DAEC owner-controlled area and mitigation efforts continue to successfully intercept the tritiated plume field.

The Cedar River was surveyed by University of Iowa Hygienic Laboratory boat on October 2, 2021 for water use downstream of the DAEC to Cedar Rapids. The survey identified no new usages of river water when compared to previous surveys.

The University of Iowa Hygienic Laboratory performed fish sampling on June 03, 2020 and August 14, 2020. Sportfish were targeted and edible fish filets include smallmouth bass, white crappie, northern pike, and channel catfish. Fish filets were processed for D-3

off-site laboratory analysis and results indicate no impact to human consumable fish from DAEC operations or plant by-products. Recreational fishing is the only identified food pathway use of Cedar River water between DAEC and the City of Cedar Rapids eight miles down-river.

State of Iowa website, https://www.iihr.uiowa.edu/igs/geosam/well/search?m=471 was used to identify new private, municipal, or commercial wells within five miles of the plant. No new wells were identified in neighboring townships T83, T84 and T85 Ranges R7W, R8W and R9W.

In accordance with the DAEC's Environmental Sampling Procedure ESP 4.4, "Land Use Census", no changes in land use were identified that would adversely affect the Defueled Safety Analysis Report (DSAR). Examples of land use that would warrant an UFSAR update include new hazards near the DAEC such as new gas pipelines or new installations utilizing toxic gases. In 2020, there were no new hazards identified that would impact DAEC operations.

As a result of the 2021 Land Use Census, adjustments were made to the MIDAS dose projection software model for changes in receptor distances. Changes to MIDAS are noted in Attachment 6 and include quality assurance test problems from 2018 and 2019.

There were no abnormalities noted between quality assurance tests and results.

The 2020 hypothetical maximally exposed organ due to airborne iodines and particulates with half-lives greater than eight days (excluding carbon-14) was the GI tract of a child at 805 meters towards the west of the facility, with an estimated dose equivalent of 0.00446 mRem. The 2020 hypothetical maximally expose organ due to a liquid effluent release from tritium is to a child's liver 0.0328 mRem at D-51, which is the liquid effluent release point into the Cedar River.

Effluents During Decommissioning DAEC ceased power production permanently August 10, 2020 following the derecho.

The derecho destroyed the cooling towers. After evaluating the condition, FPL chose not to restart the plant.

With the plant shutdown, gaseous effluents have significantly decreased. The offgas stack is no longer a release point. No credible sources of noble gas, iodine or tritium remain in the Turbine Building. Only particulate material will be monitored from the Turbine Building. No credible sources of noble gas or iodine remain in Low Level Radwaste (LLRW). Only particulate and tritium will be monitored in LLRW. While fuel remains in the fuel pool, all reactor building gaseous effluents will continue to be monitored.

D-4

To reduce plant water inventory, liquid effluent releases started in December 2020 and continued into 2021 and will continue in 2022. The liquid effluents are discharged in accordance with the DODAM sampling and analysis requirements and regulatory requirements. Three liquid radwaste discharges occurred in 2020, and ninety-four liquid discharges have occurred to date in 2021. The goal is to keep the radioactive liquid effluent less than 10% of the regulatory annual dose limit of 3 mrem Total Body and 10 mrem Organ. To date in 2021 the dose is at 6.5% Total Body and 3.0% Organ.

Groundwater mitigation will continue as tritium is removed from the shallow aquifer.

REMP Revision During Decommisioning DODAM REMP sampling and analysis requirements were evaluated and the following DODAM changes were made.

1. As 1-131and1-133 have decayed since shutdown, iodine will no longer be analyzed in air samples. An evaluation was performed and REMP particulate sampling is reduced to location D-15 and D-16.

2. The number of REMP TLDs has been reduced by approximately half. No restrictions were made to increase TLDs as needed to support IFISI activities.

3. Weekly sewage sampling remains alternating between tritium and gamma analysis each week.

4. Surface-water, soil, vegetation, fish, Cedar River bed sediment, water use survey, meat sampling, and groundwater sampling remain though number of required samples have been reduced.

5. Gaseous effluent from carbon fourteen, C-14, will cease with power production and will not need to be included in the annual effluent report.

6. The Land Use Survey remains, though because of the reduced effluents, the frequency is extended to a biennial activity.

7. The Annual Radiological Material Release Report will remain an annual regulatory reporting requirement, which is due to the NRC by May 1st of each year for the previous calendar year.

8. The Annual Radiological Environmental Operating Report will remain an annual regulatory reporting requirement, which is due to the NRC by May 15th of each year for the previous calendar year.

D-5

Conclusion The 2020 Radiological Environmental Monitoring Program (REMP) and Groundwater Protection Program (GWPP) sample locations and results were reviewed. There were no indications of any DAEC plant by-product in any REMP air, soil, riverbed sediment, vegetation, meat, surface-water, and drinking water sample.

GWPP sampling and results indicate tritiated groundwater remains within the owner-controlled area and tritium concentrations in the SE sector continue to decline due to the combination of temporary and permanent groundwater mitigation. Post shutdown, the DAEC REMP-GWPP remain. REMP-GWPP sampling and scheduling will be adjusted as needed, based on analysis review.

D-6

APPENDIX E ANNUAL RADIATION DOSE ASSESSMENT E-1

Appendix E Annual Radiation Dose Assessment The annual offsite radiation dose to a member of the public was determined by assessment of environmental dosimetry results and by calculations based on monitored effluent releases.

Section A Dose Contribution from Direct Radiation Direct radiation dose from the operation of the DAEC was captured by TLDs placed at locations in the surrounding environment as described in the ODAM-DODAM. Pre-operational and 2021 TLD results were evaluated with a paired difference statistical test. The evaluation concluded that there were no significant differences in the TLD populations for the 0.5-mile, 1 mile and Control TLD populations. No measurable dose due to the operation of the DAEC was detected by environmental TLDs in 2021. In addition, compliance with 40 CFR 190 limits of 25 mrem whole body and 75 mrem thyroid is demonstrated in the Duane Arnold Energy Center 2021 Annual Radiological Environmental Operating Report, subsections "Ambient Radiation (TLDs)" and "ISFSI Facility Operations Monitoring".

Section B Estimated Offsite Dose from Effluent Releases The contribution of dose to a member of the public most likely to be exposed from liquid and gaseous effluent releases was calculated using the MIDAS computer program in accordance with the DODAM. Calculation methods follow those prescribed by Regulatory Guide 1.109, "Calculation of Annual Doses to Man from Routine Releases of Reactor Effluents for the Purpose of Evaluating Compliance with 10 CFR Part 50, Appendix I".

Results of the MIDAS dose calculations are below:

1.) There were ninety-nine batch and continuous releases of radioactive material to liquid effluents in 2021. The maximum dose from liquid releases to an adult total body was 0.202 mrem and maximum organ dose to a teen liver was 0.315 mrem.

2.) As no noble gases were detected in 2021, the maximum gamma air dose from noble gases released was 0.0 mrad located at 481 meters towards the South-Southeast from plant centerline.

3.) As no noble gases were detected in 2021, the maximum beta air dose from noble gases released was 0.0 mrad at 481 meters towards the South-Southeast from the plant centerline.

4.) The whole-body dose equivalent to the hypothetical maximally exposed individual from E-2

noble gases was 0.0010 mrem at 805 meters towards the West from the plant centerline.

5.) The skin dose equivalent to the hypothetical maximally exposed individual from noble gases was 0.0 mrem at 805 meters towards the West from the plant centerline.

6.) The hypothetical maximally exposed organ due to airborne iodines and particulates with half-lives greater than eight days (excluding carbon-14) was 0.00103 mrem to the Lung of a child at 805 meters towards the West from the centerline of the plant.

CONCLUSION The contribution of dose to a member of the public most likely to be exposed from liquid and gaseous effluent releases was calculated using the MIDAS computer program in accordance with the ODAM-DODAM and site procedures. The calculated doses for gaseous and liquid effluent releases are below the regulatory limits stated in 10 CFR 50, Appendix I and in 40 CFR 190.

Estimated Maximum Offsite Individual Doses for 2021 Type Age Group Distance Direction Dose or Dose Equivalent Annual 10 CFR 50, (meters) (mrem) Appendix I "Limit" Direct Radiation None *

(as measured by TLDs)

Liquid Releases Whole Body Dose Adult D1 SE 0.202 mrem 3mrem Oman Dose Child - Liver D1 SE 0.315 mrem 10 mrem Noble Gas Gamma Air Dose 481 SSE 0.0 mrad 10 mrad Beta Air Dose 481 SSE 0.0 mrad 20 mrad Whole Bodv All 805 w 0.0 mrem 5 mrem Skin Child 805 w 0.0 mrem 15 mrem Particulates & Iodines Organ Dose Child - Lung 805 w 0.00103 mrem 15 mrem Carbon 14 Organ Dose Child- Bone 1,760 N 0.0 mrem 15 mrem

• There is no Appendix I limit for direct radiation. Compliance with 40 CFR 190 limits of 25 mrem whole body and 75 mrem thyroid is demonstrated in the Duane Arnold Energy Center 2021 Annual Radiological Environmental Operating Report, subsections "Ambient Radiation (TLDs)" and "ISFSI Facility Operations Monitoring.

01 Receptor location is aquatic pathway at Cedar River. See ODAM-DODAM, Figure 3-2.

E-3

~~ Al l E~vironmental,

-,J+~ /'"\I Midwest Laboratory Inc.

700 bndwc hr Rold , Northbrook, IL 60062-2310 phone (847) 564 -0700, fa x (847) 564*4517 DUANE ARNOLD ENERGY CENTER CEDAR RAPIDS, IOWA Docket No. 50-331 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM (REMP)

ANNUAL REPORT - PART II DATA TABULATIONS AND ANALYSES January 1 to December 31, 2021 Prepared by ATI ENVIRONMENTAL, Inc.

Midwest Laboratory Project No. 8001 Reviewed and Approved Ashok Banavali, Ph.D.

Laboratory Manager

TABLE OF CONTENTS Section Page List of Tables ............................................................................................................... iii

1.0 INTRODUCTION

......................................................................................................... iv 2.0 PROGRAM DEVIATIONS ............................................................................................. v 3.0 DATA TABLES ............................................................................................................. vi ii

LIST OF TABLES 1 Airborne particulates and iodine, Location D-3, analyses for gross beta and iodine-131 ............ 1-1 2 Airborne particulates and iodine, Location D-4, analyses for gross beta and iodine-131 ............ 2-1 3 Airborne particulates and iodine, Location D-5A, analyses for gross beta and iodine-131 .......... 3-1 4 Airborne particulates and iodine, Location D-6, analyses for gross beta and iodine-131 ........... .4-1 5 Airborne particulates and iodine, Location D-7, analyses for gross beta and iodine-131 ............ 5-1 6 Airborne particulates and iodine, Location D-11, analyses for gross beta and iodine-131 .......... 6-1 7 Airborne particulates and iodine, Location D-13, analyses for gross beta and iodine-131 .......... 7-1 8 Airborne particulates and iodine, Location D-15, analyses for gross beta and iodine-131 ........... 8-1 9 Airborne particulates and iodine, Location D-16, analyses for gross beta and iodine-131 ........... 9-1 10 Airborne particulates and iodine, Location D-40, analyses for gross beta and iodine-131 ......... 10-1 11 Airborne Particulate samples, quarterly composites of weekly samples, analyses for gamma-emitting isotopes ............................................................................. 11-1 12 Ambient gamma radiation by thermoluminescent dosimeters (TLD), quarterly exposure ........... 12-1 13 Groundwater samples, analysis for iodine-131, tritium and gamma-emitting isotopes ............... 13-1 14 Vegetation samples (broadleaf), analysis for iodine-131 and gamma-emitting isotopes .............................................................................................. 14-1 15 Vegetation samples (hay and grain), analysis for iodine-131 and gamma-emitting isotopes ............................................................................................ 15-1 16 Surface water samples, analysis for iodine-131, tritium and gamma-emitting isotopes .............. 16-1 17 Surface water samples, quarterly composites of monthly samples, analysis for strontium ......... 17-1 18 Fish samples, analysis for gamma-emitting isotopes ................................................................ 18-1 19 River sediment samples, analysis for gamma-emitting isotopes .......................................... 19-1 20 Groundwater Protection Program ................................................................................... 20-1 iii

1.0 INTRODUCTION

The following constitutes a supplement to the Annual Report for the Radiological Environmental Monitoring Program conducted at the Duane Arnold Energy Center, Palo, Iowa in 2021. Results of completed analyses are presented in the attached tables.

For information regarding sampling locations, type and frequency of collection, and sample codes, please refer to Part I, Tables 5.3 - 5.5 and Figures 5.1 and 5.2.

All concentrations, except gross beta and airborne iodine, are decay corrected to the time of collection.

Airborne 1-131 is decayed to the midpoint of the collection period.

The required values for lower limits of detection (LLD) for gamma emitting isotopes are established through the Offsite Dose Assessment Manual (ODAM). Naturally occurring radioisotopes, such as Be-7, K-40 and Ra daughters, are frequently detected, but may not be listed for every sample medium.

iv

2.0 PROGRAM DEVIATIONS Sample Collection Date Type Analysis Location( s) or Period Comments SW D-49 01-13-21 No sample; river frozen.

SW D-61 01-13-21 No sample; river frozen.

SW D-99 01-13-21 No sample; river frozen.

SW D-49 02-11-21 No sample; river frozen.

SW D-50 02-11-21 No sample; river frozen.

SW D-51 02-11-21 No sample; river frozen.

SW D-61 02-11-21 No sample; river frozen.

SW D-99 02-11-21 No sample; river frozen.

TLD D-02 1st Qtr '21 TLD lost in field.

TLD D-83 1st Qtr '21 TLD lost in field.

Sample not collected due to power outage WW D-58 08-25-21 at location.

Sample not collected due to power outage WW D-58 11-18-21 at location.

TLD D-8 4th Qtr '21 TLD lost in field.

v

3.0 DATA TABLES vi

Table 1. Airborne particulates and charcoal canisters, analyses for gross beta and iodine-131 8 .

Location: D-3 (Hiawatha) 3 Units: pCi/m Collection: Continuous, weekly exchange.

Date Volume Date Volume Collected (m3) Gross Beta Collected (m3) Gross Beta Required LLD 0.010 Required LLD 0.010 01-08-21 310 0.044 +/- 0.004 01-14-21 232 0.052 +/- 0.006 01-22-21 323 0.026 +/- 0.003 01-29-21 283 0.026 +/- 0.004 02-03-21 202 0.029 +/- 0.005 02-10-21 283 0.047 +/- 0.005 02-18-21 322 0.039 +/- 0.004 02-25-21 283 0.052 +/- 0.005 03-05-21 322 0.035 +/- 0.004 03-12-21 283 0.026 +/- 0.004 03-18-21 240 0.025 +/- 0.004 03-26-21 324 0.015 +/- 0.003 04-02-21 283 0.023 +/- 0.003 1st Quarter Mean+/- s.d. 0.034 +/- 0.012 04-09-21 282 0.027 +/- 0.004 04-16-21 283 0.006 +/- 0.002 Collection discontinued at the location 2nd Quarter Mean +/- s.d. 0.016 +/- 0.015 Cumulative Average 0.031 3

a lodine-131 concentrations are< 0.03 pCi/m unless noted otherwise.

1-1

Table 2. Airborne particulates and charcoal canisters, analyses for gross beta and iodine-131 a.

Location: D-4 (NW Sector)

Units: pCi/m 3 Collection: Continuous, weekly exchange.

Date Volume Date Volume Collected (m3) Gross Beta Collected (m3) Gross Beta Required LLD 0.010 Required LLD 0.010 01-08-21 320 0.045 +/- 0.004 07-09-21 300 0.025 +/- 0.004 01-14-21 240 0.052 +/- 0.005 07-16-21 300 0.021 +/- 0.003 01-22-21 320 0.022 +/- 0.003 07-23-21 300 0.031 +/- 0.004 01-29-21 280 0.031 +/- 0.004 07-31-21 343 0.034 +/- 0.004 02-03-21 200 0.033 +/- 0.005 08-06-21 258 0.024 +/- 0.004 02-10-21 280 0.048 +/- 0.005 08-12-21 257 0.030 +/- 0.004 02-18-21 319 0.045 +/- 0.004 08-20-21 341 0.031 +/- 0.004 02-25-21 280 0.059 +/- 0.005 08-27-21 299 0.020 +/- 0.004 03-05-21 319 0.017 +/- 0.003 09-02-21 257 0.031 +/- 0.004 03-12-21 280 0.029 +/- 0.004 09-10-21 342 0.027 +/- 0.003 03-18-21 237 0.022 +/- 0.004 09-17-21 275 0.046 +/- 0.005 03-26-21 321 0.020 +/- 0.003 09-24-21 274 0.025 +/- 0.004 04-02-21 280 0.023 +/- 0.003 10-01-21 274 0.044 +/- 0.005 1st Quarter Mean+/- s.d. 0.034 +/- 0.014 3rd Quarter Mean+/- s.d. 0.030 +/- 0.008 04-09-21 279 0.023 +/- 0.003 10-08-21 277 0.034 +/- 0.004 04-16-21 280 0.006 +/- 0.003 10-15-21 272 0.033 +/- 0.004 04-23-21 280 0.018 +/- 0.003 10-22-21 274 0.031 +/- 0.004 04-29-21 240 0.024 +/- 0.004 10-29-21 275 0.018 +/- 0.003 05-07-21 320 0.017 +/- 0.003 11-05-21 275 0.026 +/- 0.004 05-14-21 299 0.013 +/- 0.003 11-11-21 236 0.042 +/- 0.005 05-21-21 300 0.020 +/- 0.003 11-18-21 274 0.017 +/- 0.003 05-28-21 300 0.016 +/- 0.003 11-24-21 236 0.036 +/- 0.005 12-02-21 313 0.036 +/- 0.004 06-04-21 299 0.024 +/- 0.004 06-10-21 258 0.025 +/- 0.004 12-09-21 274 0.027 +/- 0.004 06-18-21 342 0.024 +/- 0.003 12-16-21 275 0.038 +/- 0.004 06-25-21 300 0.019 +/- 0.003 12-22-21 234 0.043 +/- 0.005 07-02-21 299 0.022 +/- 0.003 12-30-21 314 0.060 +/- 0.005 2nd Quarter Mean +/- s.d. 0.019 +/- 0.006 4th Quarter Mean +/- s.d. 0.034 +/- 0.011 Cumulative Average 0.029 a lodine-131 concentrations are< 0.03 pCi/m 3 unless noted otherwise.

2-1

8 Table 3. Airborne particulates and charcoal canisters, analyses for gross beta and iodine-131 .

Location: D-5A (Palo) 3 Units: pCi/m Collection: Continuous, weekly exchange.

Date Volume Date Volume Collected (m3) Gross Beta Collected (m3) Gross Beta Required LLD 0.010 Required LLD 0.010 01-08-21 316 0.043 +/- 0.004 07-09-21 272 0.024 +/- 0.004 01-14-21 237 0.052 +/- 0.005 07-16-21 272 0.024 +/- 0.004 01-22-21 316 0.025 +/- 0.003 07-23-21 271 0.019 +/- 0.003 01-29-21 277 0.031 +/- 0.004 07-31-21 311 0.033 +/- 0.004 02-03-21 198 0.034 +/- 0.005 08-06-21 233 0.027 +/- 0.004 02-10-21 278 0.047 +/- 0.005 08-12-21 232 0.031 +/- 0.005 02-18-21 315 0.042 +/- 0.004 08-20-21 309 0.036 +/- 0.004 02-25-21 278 0.050 +/- 0.005 08-27-21 276 0.027 +/- 0.004 03-05-21 308 0.035 +/- 0.004 09-02-21 237 0.041 +/- 0.005 03-12-21 271 0.035 +/- 0.004 09-10-21 316 0.032 +/- 0.004 03-18-21 231 0.023 +/- 0.004 09-17-21 278 0.042 +/- 0.004 03-26-21 310 0.016 +/- 0.003 09-24-21 276 0.028 +/- 0.004 04-02-21 270 0.027 +/- 0.004 10-01-21 277 0.047 +/- 0.005 1st Quarter Mean+/- s.d. 0.036 +/- 0.011 3rd Quarter Mean +/- s.d. 0.032 +/- 0.008 04-09-21 271 0.031 +/- 0.004 10-08-21 280 0.028 +/- 0.004 04-16-21 272 0.007 +/- 0.003 10-15-21 275 0.032 +/- 0.004 04-23-21 270 0.025 +/- 0.004 10-22-21 276 0.033 +/- 0.004 04-29-21 232 0.030 +/- 0.004 10-29-21 277 0.020 +/- 0.004 05-07-21 310 0.024 +/- 0.003 11-05-21 277 0.029 +/- 0.004 05-14-21 268 0.018 +/- 0.003 11-11-21 238 0.046 +/- 0.005 05-21-21 271 0.028 +/- 0.004 11-18-21 277 0.016 +/- 0.003 05-28-21 272 0.022 +/- 0.004 11-24-21 239 0.038 +/- 0.005 12-02-21 316 0.038 +/- 0.004 06-04-21 270 0.029 +/- 0.004 06-10-21 233 0.022 +/- 0.004 12-09-21 277 0.024 +/- 0.004 06-18-21 309 0.025 +/- 0.003 12-16-21 278 0.037 +/- 0.004 06-25-21 272 0.028 +/- 0.004 12-22-21 236 0.048 +/- 0.005 07-02-21 270 0.023 +/- 0.004 12-30-21 317 0.061 +/- 0.005 2nd Quarter Mean +/- s.d. 0.024 +/- 0.006 4th Quarter Mean +/- s.d. 0.035 +/- 0.012 Cumulative Average 0.032 3

a lodine-131 concentrations are< 0.03 pCi/m unless noted otherwise.

3-1

Table 4. Airborne particulates and charcoal canisters, analyses for gross beta and iodine-131 a.

Location: D-6 (Center Point) 3 Units: pCi/m Collection: Continuous, weekly exchange.

Date Volume Date Volume Collected (m3) Gross Beta Collected (m3) Gross Beta Required LLD 0.010 Required LLD 0.010 01-08-21 333 0.046 +/- 0.004 01-14-21 249 0.050 +/- 0.005 01-22-21 333 0.028 +/- 0.003 01-29-21 291 0.032 +/- 0.004 02-03-21 208 0.035 +/- 0.005 02-10-21 294 0.049 +/- 0.005 02-18-21 332 0.044 +/- 0.004 02-25-21 292 0.051 +/- 0.005 03-05-21 332 0.027 +/- 0.003 03-12-21 291 0.032 +/- 0.004 03-18-21 247 0.023 +/- 0.004 03-26-21 333 0.018 +/- 0.003 04-02-21 274 0.022 +/- 0.003 1st Quarter Mean+/- s.d. 0.035 +/- 0.012 04-09-21 274 0.027 +/- 0.004 04-16-21 274 0.006 +/- 0.003 Collection discontinued at the location 2nd Quarter Mean +/- s.d. 0.016 +/- 0.015 Cumulative Average 0.033 3

a lodine-131 concentrations are< 0.03 pCi/m unless noted otherwise.

4-1

Table 5. Airborne particulates and charcoal canisters, analyses for gross beta and iodine-131 a.

Location: D-7 (Shellsburg) 3 Units: pCi/m Collection: Continuous, weekly exchange.

Date Volume Date Volume Collected (m3) Gross Beta Collected (m3) Gross Beta Required LLD 0.010 Required LLD 0.010 01-08-21 320 0.048 +/- 0.004 01-14-21 240 0.052 +/- 0.005 01-22-21 320 0.027 +/- 0.003 01-29-21 280 0.033 +/- 0.004 02-03-21 200 0.030 +/- 0.005 02-10-21 281 0.048 +/- 0.005 02-18-21 319 0.046 +/- 0.004 02-25-21 281 0.058 +/- 0.005 03-05-21 318 0.031 +/- 0.004 03-12-21 280 0.025 +/- 0.004 03-18-21 238 0.024 +/- 0.004 03-26-21 320 0.016 +/- 0.003 04-02-21 280 0.021 +/- 0.003 1st Quarter Mean+/- s.d. 0.035 +/- 0.014 04-09-21 280 0.024 +/- 0.003 04-16-21 280 0.008 +/- 0.003 Collection discontinued at the location 2nd Quarter Mean +/- s.d. 0.016 +/- 0.011 Cumulative Average 0.033 3

a lodine-131 concentrations are < 0. 03 pCi/m unless noted otherwise.

5-1

8 Table 6. Airborne particulates and charcoal canisters, analyses for gross beta and iodine-131 .

Location: D-11 (Toddville) 3 Units: pCi/m Collection: Continuous, weekly exchange.

Date Volume Date Volume Collected (m3) Gross Beta Collected (m3) Gross Beta Required LLD 0.010 Required LLD 0.010 01-08-21 330 0.047 +/- 0.004 01-14-21 247 0.055 +/- 0.005 01-22-21 330 0.024 +/- 0.003 01-29-21 289 0.025 +/- 0.004 02-03-21 206 0.034 +/- 0.005 02-10-21 289 0.049 +/- 0.005 02-18-21 328 0.041 +/- 0.004 02-25-21 289 0.053 +/- 0.005 03-05-21 329 0.031 +/- 0.004 03-12-21 289 0.031 +/- 0.004 03-18-21 245 0.025 +/- 0.004 03-26-21 343 0.020 +/- 0.003 04-02-21 300 0.019 +/- 0.003 1st Quarter Mean+/- s.d. 0.035 +/- 0.013 04-09-21 299 0.026 +/- 0.003 04-16-21 300 0.007 +/- 0.002 Collection discontinued at the location 2nd Quarter Mean +/- s.d. 0.016 +/- 0.013 Cumulative Average 0.032 a lodine-131 concentrations are< 0.03 pCi/m 3 unless noted otherwise.

6-1

8 Table 7. Airborne particulates and charcoal canisters, analyses for gross beta and iodine-131 .

Location: D-13 (Alburnett) 3 Units: pCi/m Collection: Continuous, weekly exchange.

Date Volume Date Volume Collected (m3) Gross Beta Collected (m3) Gross Beta Required LLD 0.010 Required LLD 0.010 01-08-21 310 0.059 +/- 0.005 07-09-21 266 0.023 +/- 0.004 01-14-21 232 0.065 +/- 0.006 07-16-21 274 0.020 +/- 0.003 01-22-21 303 0.026 +/- 0.004 07-23-21 274 0.028 +/- 0.004 01-29-21 266 0.030 +/- 0.004 07-31-21 314 0.026 +/- 0.003 02-03-21 190 0.036 +/- 0.006 08-06-21 236 0.026 +/- 0.004 02-10-21 266 0.050 +/- 0.005 08-12-21 235 0.027 +/- 0.004 02-18-21 302 0.042 +/- 0.004 08-20-21 312 0.028 +/- 0.004 02-25-21 266 0.056 +/- 0.005 08-27-21 273 0.020 +/- 0.004 03-05-21 303 0.027 +/- 0.004 09-02-21 235 0.033 +/- 0.005 03-12-21 266 0.032 +/- 0.004 09-10-21 313 0.025 +/- 0.003 03-18-21 225 0.025 +/- 0.004 09-17-21 275 0.015 +/- 0.003 03-26-21 304 0.020 +/- 0.003 09-24-21 274 0.026 +/- 0.004 04-02-21 266 0.019 +/- 0.003 10-01-21 274 0.024 +/- 0.004 1st Quarter Mean +/- s.d. 0.038 +/- 0.015 3rd Quarter Mean +/- s.d. 0.025 +/- 0.004 04-09-21 265 0.025 +/- 0.004 10-08-21 277 0.028 +/- 0.004 04-16-21 266 0.007 +/- 0.003 10-15-21 275 0.029 +/- 0.004 04-23-21 266 0.019 +/- 0.003 10-22-21 276 0.023 +/- 0.004 04-29-21 228 0.027 +/- 0.004 10-29-21 277 0.018 +/- 0.003 05-07-21 304 0.017 +/- 0.003 11-05-21 277 0.024 +/- 0.004 05-14-21 265 0.010 +/- 0.003 11-11-21 238 0.039 +/- 0.005 05-21-21 266 0.021 +/- 0.004 11-18-21 277 0.016 +/- 0.003 05-28-21 266 0.016 +/- 0.003 11-24-21 239 0.026 +/- 0.004 12-02-21 316 0.031 +/- 0.004 06-04-21 265 0.029 +/- 0.004 06-10-21 228 0.016 +/- 0.004 12-09-21 277 0.019 +/- 0.004 06-18-21 303 0.022 +/- 0.003 12-16-21 278 0.030 +/- 0.004 06-25-21 266 0.021 +/- 0.004 12-22-21 237 0.046 +/- 0.005 07-02-21 265 0.021 +/- 0.004 12-30-21 317 0.046 +/- 0.004 2nd Quarter Mean +/- s.d. 0.019 +/- 0.006 4th Quarter Mean+/- s.d. 0.029 +/- 0.010 Cumulative Average 0.028 a lodine-131 concentrations are< 0.03 pCi/m 3 unless noted otherwise.

7-1

8 Table 8. Airborne particulates and charcoal canisters, analyses for gross beta and iodine-131 .

Location: D-15 (On-site, north)

Units: pCi/m 3 Collection: Continuous, weekly exchange.

Date Volume Date Volume Collected (m3) Gross Beta Collected (m3) Gross Beta Required LLD 0.010 Required LLD 0.010 01-08-21 326 0.047 +/- 0.004 07-09-21 277 0.028 +/- 0.004 01-14-21 244 0.050 +/- 0.005 07-16-21 277 0.026 +/- 0.004 01-22-21 326 0.029 +/- 0.004 07-23-21 277 0.038 +/- 0.004 01-29-21 286 0.032 +/- 0.004 07-31-21 321 0.037 +/- 0.004 02-03-21 204 0.035 +/- 0.005 08-06-21 240 0.028 +/- 0.004 02-10-21 286 0.045 +/- 0.005 08-12-21 240 0.035 +/- 0.005 02-18-21 325 0.046 +/- 0.004 08-20-21 319 0.037 +/- 0.004 02-25-21 286 0.054 +/- 0.005 08-27-21 279 0.024 +/- 0.004 03-05-21 316 0.035 +/- 0.004 09-02-21 240 0.035 +/- 0.005 03-12-21 277 0.033 +/- 0.004 09-10-21 320 0.035 +/- 0.004 03-18-21 235 0.029 +/- 0.004 09-17-21 281 0.040 +/- 0.004 03-26-21 317 0.020 +/- 0.003 09-24-21 279 0.029 +/- 0.004 04-02-21 277 0.016 +/- 0.003 10-01-21 280 0.044 +/- 0.005 1st Quarter Mean+/- s.d. 0.036 +/- 0.011 3rd Quarter Mean +/- s.d. 0.034 +/- 0.006 04-09-21 277 0.020 +/- 0.003 10-08-21 283 0.029 +/- 0.004 04-16-21 277 0.009 +/- 0.003 10-15-21 263 0.034 +/- 0.004 04-23-21 277 0.022 +/- 0.003 10-22-21 265 0.032 +/- 0.004 04-29-21 237 0.023 +/- 0.004 10-29-21 266 0.018 +/- 0.004 05-07-21 317 0.014 +/- 0.003 11-05-21 266 0.030 +/- 0.004 05-14-21 276 0.014 +/- 0.003 11-11-21 229 0.046 +/- 0.005 05-21-21 277 0.023 +/- 0.004 11-18-21 265 0.016 +/- 0.003 05-28-21 277 0.019 +/- 0.003 11-24-21 229 0.035 +/- 0.005 12-02-21 303 0.034 +/- 0.004 06-04-21 277 0.030 +/- 0.004 06-10-21 239 0.022 +/- 0.004 12-09-21 266 0.026 +/- 0.004 06-18-21 316 0.028 +/- 0.004 12-16-21 266 0.035 +/- 0.004 06-25-21 277 0.024 +/- 0.004 12-22-21 227 0.046 +/- 0.005 07-02-21 276 0.023 +/- 0.004 12-30-21 304 0.058 +/- 0.005 2nd Quarter Mean +/- s.d. 0.021 +/- 0.006 4th Quarter Mean +/- s.d. 0.034 +/- 0.011 Cumulative Average 0.031 a lodine-131 concentrations are< 0.03 pCi/m 3 unless noted otherwise.

8-1

8 Table 9. Airborne particulates and charcoal canisters, analyses for gross beta and iodine-131 .

Location: D-16 (On-site) 3 Units: pCi/m Collection: Continuous, weekly exchange.

Date Volume Date Volume Collected (m3) Gross Beta Collected (m3) Gross Beta Required LLD 0.010 Required LLD 0.010 01-08-21 346 0.049 +/- 0.004 07-09-21 286 0.026 +/- 0.004 01-14-21 259 0.053 +/- 0.005 07-16-21 286 0.022 +/- 0.003 01-22-21 346 0.029 +/- 0.003 07-23-21 285 0.036 +/- 0.004 01-29-21 303 0.034 +/- 0.004 07-31-21 327 0.042 +/- 0.004 02-03-21 217 0.037 +/- 0.005 08-06-21 245 0.025 +/- 0.004 02-10-21 303 0.051 +/- 0.005 08-12-21 245 0.035 +/- 0.005 02-18-21 345 0.042 +/- 0.004 08-20-21 325 0.037 +/- 0.004 02-25-21 303 0.057 +/- 0.005 08-27-21 285 0.019 +/- 0.004 03-05-21 345 0.031 +/- 0.004 09-02-21 245 0.038 +/- 0.005 03-12-21 303 0.034 +/- 0.004 09-10-21 326 0.031 +/- 0.004 03-18-21 256 0.027 +/- 0.004 09-17-21 269 0.048 +/- 0.005 03-26-21 347 0.019 +/- 0.003 09-24-21 268 0.027 +/- 0.004 04-02-21 303 0.020 +/- 0.003 10-01-21 269 0.052 +/- 0.005 1st Quarter Mean+/- s.d. 0.037 +/- 0.012 3rd Quarter Mean +/- s.d. 0.034 +/- 0.010 04-09-21 302 0.027 +/- 0.003 10-08-21 271 0.033 +/- 0.004 04-16-21 303 0.007 +/- 0.002 10-15-21 266 0.031 +/- 0.004 04-23-21 303 0.018 +/- 0.003 10-22-21 268 0.031 +/- 0.004 04-29-21 260 0.028 +/- 0.004 10-29-21 269 0.021 +/- 0.004 05-07-21 317 0.022 +/- 0.003 11-05-21 269 0.029 +/- 0.004 05-14-21 285 0.013 +/- 0.003 11-11-21 231 0.048 +/- 0.005 05-21-21 286 0.021 +/- 0.004 11-18-21 268 0.014 +/- 0.003 05-28-21 286 0.021 +/- 0.003 11-24-21 231 0.028 +/- 0.005 12-02-21 306 0.036 +/- 0.004 06-04-21 285 0.027 +/- 0.004 06-10-21 246 0.023 +/- 0.004 12-09-21 269 0.032 +/- 0.004 06-18-21 325 0.025 +/- 0.003 12-16-21 269 0.040 +/- 0.004 06-25-21 286 0.022 +/- 0.003 12-22-21 229 0.046 +/- 0.005 07-02-21 285 0.020 +/- 0.003 12-30-21 307 0.064 +/- 0.005 2nd Quarter Mean +/- s.d. 0.021 +/- 0.006 4th Quarter Mean +/- s.d. 0.035 +/- 0.013 Cumulative Average 0.032 a lodine-131 concentrations are< 0.03 pCi/m 3 unless noted otherwise.

9-1

Table 10. Airborne particulates and charcoal canisters, analyses for gross beta and iodine-131 8 .

Location: D-40 (Wickiup Hill) 3 Units: pCi/m Collection: Continuous, weekly exchange.

Date Volume Date Volume Collected (mJ) Gross Beta Collected (mJ) Gross Beta Required LLD 0.010 Required LLD 0.010 01-08-21 336 0.049 +/- 0.004 01-14-21 252 0.053 +/- 0.005 01-22-21 336 0.027 +/- 0.003 01-29-21 294 0.035 +/- 0.004 02-03-21 210 0.038 +/- 0.005 02-10-21 295 0.052 +/- 0.005 02-18-21 335 0.055 +/- 0.005 02-25-21 295 0.060 +/- 0.005 03-05-21 334 0.032 +/- 0.004 03-12-21 294 0.029 +/- 0.004 03-18-21 250 0.027 +/- 0.004 03-26-21 327 0.015 +/- 0.003 04-02-21 286 0.020 +/- 0.003 1st Quarter Mean+/- s.d. 0.038 +/- 0.014 04-09-21 285 0.024 +/- 0.003 04-16-21 286 0.006 +/- 0.002 Collection discontinued at the location 2nd Quarter Mean +/- s.d. 0.015 +/- 0.013 Cumulative Average 0.035 3

a lodine-131 concentrations are< 0.03 pCi/m unless noted otherwise.

10-1

Table 11. Airborne particulates, analyses for gamma-emitting isotopes.

Collection: Quarterly Composite Units: pCi/mJ Location D-3 Quarter 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Lab Code OAP- 1024 OAP- 2144 Volume (mJ) 3690 565 Discontinued Discontinued Be-7 0.077 +/- 0.015 < 0.181 Mn-54 < 0.0006 < 0.0054 Fe-59 < 0.0023 < 0.0398 Co-58 < 0.0008 < 0.0110 Co-60 < 0.0003 < 0.0039 Zn-65 < 0.0017 < 0.0131 Nb-95 < 0.0008 < 0.0327 Zr-95 < 0.0010 < 0.0240 Ru-103 < 0.0012 < 0.0173 Ru-106 < 0.0081 < 0.0518 Cs-134 < 0.0009 < 0.0060 Cs-137 < 0.0008 < 0.0043 Ce-141 < 0.0010 < 0.0682 Ce-144 < 0.0052 < 0.0425 Location D-4 Quarter 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Lab Code OAP- 1025 OAP- 2145 OAP- 3386 OAP- 4355 Volume (mJ) 3676 3797 3820 3527 Be-7 0.065 +/- 0.014 0.108 +/- 0.016 0.078 +/- 0.015 0.069 +/- 0.019 Mn-54 < 0.0007 < 0.0007 < 0.0007 < 0.0007 Fe-59 < 0.0010 < 0.0007 < 0.0012 < 0.0026 Co-58 < 0.0004 < 0.0006 < 0.0008 < 0.0009 Co-60 < 0.0004 < 0.0004 < 0.0007 < 0.0006 Zn-65 < 0.0007 < 0.0012 < 0.0018 < 0.0011 Nb-95 < 0.0009 < 0.0006 < 0.0009 < 0.0015 Zr-95 < 0.0008 < 0.0013 < 0.0022 < 0.0019 Ru-103 < 0.0010 < 0.0011 < 0.0015 < 0.0012 Ru-106 < 0.0063 < 0.0083 < 0.0057 < 0.0073 Cs-134 < 0.0008 < 0.0008 < 0.0010 < 0.0009 Cs-137 < 0.0005 < 0.0007 < 0.0008 < 0.0007 Ce-141 < 0.0008 < 0.0013 < 0.0020 < 0.0016 Ce-144 < 0.0023 < 0.0029 < 0.0050 < 0.0044 Location D-5A Quarter 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Lab Code OAP- 1026 OAP- 2146 OAP- 3387 OAP- 4356 Volume (mJ) 3607 3520 3560 3564 Be-7 0.081 +/- 0.018 0.101 +/- 0.013 0.110 +/- 0.017 0.091 +/- 0.020 Mn-54 < 0.0009 < 0.0006 < 0.0009 < 0.0009 Fe-59 < 0.0017 < 0.0013 < 0.0013 < 0.0021 Co-58 < 0.0008 < 0.0005 < 0.0011 < 0.0009 Co-60 < 0.0005 < 0.0004 < 0.0005 < 0.0005 Zn-65 < 0.0008 < 0.0016 < 0.0008 < 0.0007 Nb-95 < 0.0014 < 0.0005 < 0.0013 < 0.0017 Zr-95 < 0.0020 < 0.0012 < 0.0020 < 0.0025 Ru-103 < 0.0010 < 0.0007 < 0.0016 < 0.0015 Ru-106 < 0.0072 < 0.0042 < 0.0054 < 0.0063 Cs-134 < 0.0009 < 0.0008 < 0.0009 < 0.0010 Cs-137 < 0.0009 < 0.0004 < 0.0009 < 0.0010 Ce-141 < 0.0014 < 0.0009 < 0.0016 < 0.0019 Ce-144 < 0.0043 < 0.0040 < 0.0041 < 0.0032 a Collection stopped at 4/16/21 11-1

Table 11. Airborne particulates, analyses for gamma-emitting isotopes.

Collection: Quarterly Composite Units: pCilm" Location D-6 Quarter 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Lab Code OAP- 1027 OAP- 2147 Volume (m") 3810 548 Discontinued Discontinued Be-7 0.081 +/- 0.013 < 0.210 Mn-54 < 0.0008 < 0.0062 Fe-59 < 0.0008 < 0.0374 Co-58 < 0.0006 < 0.0111 Co-60 < 0.0004 < 0.0043 Zn-65 < 0.0006 < 0.0129 Nb-95 < 0.0009 < 0.0226 Zr-95 < 0.0008 < 0.0182 Ru-103 < 0.0009 < 0.0304 Ru-106 < 0.0044 < 0.0331 Cs-134 < 0.0008 < 0.0059 Cs-137 < 0.0009 < 0.0064 Ce-141 < 0.0014 < 0.0448 Ce-144 < 0.0026 < 0.0301 Location D-7 Quarter 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Lab Code DAP- 1028 OAP- 2148 Volume (m") 3675 560 Discontinued Discontinued Be-7 0.076 +/- 0.016 < 0.086 Mn-54 < 0.0008 < 0.0040 Fe-59 < 0.0010 < 0.0294 Co-58 < 0.0006 < 0.0063 Co-60 < 0.0005 < 0.0022 Zn-65 < 0.0014 < 0.0045 Nb-95 < 0.0009 < 0.0191 Zr-95 < 0.0014 < 0.0151 Ru-103 < 0.0010 < 0.0235 Ru-106 < 0.0070 < 0.0425 Cs-134 < 0.0010 < 0.0040 Cs-137 < 0.0007 < 0.0045 Ce-141 < 0.0018 < 0.0260 Ce-144 < 0.0043 < 0.0308 Location D-11 Quarter 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Lab Code DAP- 1029 DAP- 2149 3

Volume (m ) 3813 599 Discontinued Discontinued Be-7 0.079 +/- 0.012 < 0.095 Mn-54 < 0.0005 < 0.0035 Fe-59 < 0.0009 < 0.0339 Co-58 < 0.0006 < 0.0046 Co-60 < 0.0004 < 0.0029 Zn-65 < 0.0016 < 0.0094 Nb-95 < 0.0009 < 0.0312 Zr-95 < 0.0017 < 0.0205 Ru-103 < 0.0006 < 0.0152 Ru-106 < 0.0055 < 0.0451 Cs-134 < 0.0010 < 0.0039 Cs-137 < 0.0006 < 0.0036 Ce-141 < 0.0011 < 0.0303 Ce-144 < 0.0036 < 0.0194 "Collection stopped at 4/16/21 11-2

Table 11. Airborne particulates, analyses for gamma-emitting isotopes.

0 Collection: Quarterly Composite Units: pCi/m Location D-13 Quarter 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Lab Code DAP- 1031 DAP- 2150 DAP- 3388 DAP- 4357 0

Volume (m ) 3500 3452 3555 3561 Be-7 0.075 +/- 0.013 0.102 +/- 0.012 0.066 +/- 0.018 0.051 +/- 0.021 Mn-54 < 0.0009 < 0.0007 < 0.0010 < 0.0012 Fe-59 < 0.0012 < 0.0010 < 0.0018 < 0.0028 Co-58 < 0.0006 < 0.0005 < 0.0012 < 0.0012 Co-60 < 0.0008 < 0.0005 < 0.0005 < 0.0008 Zn-65 < 0.0019 < 0.0008 < 0.0018 < 0.0014 Nb-95 < 0.0010 < 0.0009 < 0.0016 < 0.0012 Zr-95 < 0.0012 < 0.0013 < 0.0018 < 0.0018 Ru-103 < 0.0008 < 0.0008 < 0.0016 < 0.0013 Ru-106 < 0.0062 < 0.0052 < 0.0094 < 0.0047 Cs-134 < 0.0010 < 0.0007 < 0.0010 < 0.0010 Cs-137 < 0.0006 < 0.0006 < 0.0011 < 0.0005 Ce-141 < 0.0016 < 0.0010 < 0.0023 < 0.0026 Ce-144 < 0.0043 < 0.0022 < 0.0052 < 0.0064 Location D-15 Quarter 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Lab Code DAP- 1032 DAP- 2151 DAP- 3390 DAP- 4358 Volume (m") 3707 3601 3628 3431 Be-7 0.064 +/- 0.015 0.117 +/- 0.017 0.102 +/- 0.019 0.080 +/- 0.017 Mn-54 < 0.0007 < 0.0009 < 0.0009 < 0.0009 Fe-59 < 0.0013 < 0.0012 < 0.0022 < 0.0025 Co-58 < 0.0011 < 0.0007 < 0.0008 < 0.0006 Co-60 < 0.0007 < 0.0004 < 0.0005 < 0.0004 Zn-65 < 0.0019 < 0.0016 < 0.0011 < 0.0017 Nb-95 < 0.0009 < 0.0010 < 0.0014 < 0.0012 Zr-95 < 0.0017 < 0.0013 < 0.0022 < 0.0012 Ru-103 < 0.0006 < 0.0011 < 0.0013 < 0.0010 Ru-106 < 0.0059 < 0.0075 < 0.0093 < 0.0052 Cs-134 < 0.0010 < 0.0008 < 0.0010 < 0.0009 Cs-137 < 0.0010 < 0.0007 < 0.0007 < 0.0008 Ce-141 < 0.0014 < 0.0012 < 0.0011 < 0.0027 Ce-144 < 0.0039 < 0.0030 < 0.0045 < 0.0038 Location D-16 Quarter 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Lab Code DAP- 1033 DAP- 2152 DAP- 3391 DAP- 4359 0

Volume (m ) 3976 3769 3660 3453 Be-7 0.073 +/- 0.012 0.097 +/- 0.015 0.091 +/- 0.016 0.092 +/- 0.021 Mn-54 < 0.0004 < 0.0007 < 0.0007 < 0.0016 Fe-59 < 0.0006 < 0.0017 < 0.0011 < 0.0043 Co-58 < 0.0005 < 0.0007 < 0.0006 < 0.0021 Co-60 < 0.0005 < 0.0005 < 0.0005 < 0.0012 Zn-65 < 0.0005 < 0.0015 < 0.0009 < 0.0048 Nb-95 < 0.0006 < 0.0007 < 0.0011 < 0.0026 Zr-95 < 0.0017 < 0.0010 < 0.0015 < 0.0020 Ru-103 < 0.0008 < 0.0010 < 0.0008 < 0.0015 Ru-106 < 0.0055 < 0.0056 < 0.0067 < 0.0060 Cs-134 < 0.0008 < 0.0007 < 0.0008 < 0.0016 Cs-137 < 0.0005 < 0.0007 < 0.0006 < 0.0007 Ce-141 < 0.0017 < 0.0010 < 0.0012 < 0.0025 Ce-144 < 0.0036 < 0.0029 < 0.0037 < 0.0039 11-3

Table 11. Airborne particulates, analyses for gamma-emitting isotopes.

Collection: Quarterly Composite Units: pCilm" Location D-40 Quarter 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Lab Code OAP- 1034 OAP- 2153 Volume (m") 3845 571 Discontinued Discontinued Be-7 0.077 +/- 0.013 < 0.127 Mn-54 < 0.0008 < 0.0043 Fe-59 < 0.0007 < 0.0339 Co-58 < 0.0006 < 0.0100 Co-60 < 0.0007 < 0.0046 Zn-65 < 0.0010 < 0.0099 Nb-95 < 0.0007 < 0.0202 Zr-95 < 0.0012 < 0.0142 Ru-103 < 0.0008 < 0.0209 Ru-106 < 0.0078 < 0.0386 Cs-134 < 0.0007 < 0.0049 Cs-137 < 0.0004 < 0.0030 Ce-141 < 0.0012 < 0.0291 Ce-144 < 0.0036 < 0.0217 a Collection stopped at 4/16/21 11-4

Table 12. Ambient gamma radiation as measured by thermoluminescent dosimeters (TLD).

Quarterly collection. Units: mR/91 days Control Locations 1st Qtr. 2nd Qtr. 3rd Qtr. 4th Qtr.

D-1 14.0+/-1.2 12.5+/-1.6 14.3+/-1.1 14.1 +/- 1.2 D-2 NDa 15.2 +/- 0.6 14.3 +/- 0.8 14.9 +/- 0.5 D-3 12.3 +/- 0.7 13.1 +/-0.7 13.5 +/- 0.8 14.3 +/- 0.9 D-4 14.0+/-1.2 15.3+/-1.1 15.4+/-1.2 16.9+/-1.4 D-5 15.7 +/- 0.8 17.5 +/- 1.0 17.9 +/- 0.9 18.4 +/- 0.6 D-5A 14.4 +/- 0.8 13.5 +/- 0.5 13.9 +/- 0.8 15.3 +/- 0.6 D-6 13.0 +/- 0.9 13.8 +/- 0.7 13.9 +/- 0.9 15.1+/-0.7 D-7 11.5 +/- 0.7 13.5+/-1.2 12.8 +/- 0.7 14.9 +/- 0.8 D-8 16.1 +/- 0.9 17.7+/-1.5 18.2 +/- 0.9 NDa D-10 16.0 +/- 0.9 15.5 +/- 0.8 16.9 +/- 0.9 17.2 +/- 1.1 D-11 12.7 +/- 0.7 11.8+/-1.4 13.6 +/- 0.7 13.2 +/- 0.9 D-13 13.3 +/- 0.7 13.6 +/- 0.9 14.5+/-1.4 16.0 +/- 0.7 Mean+/- s.d. 13.9 +/- 1.6 14.4+/-1.9 14.9+/-1.8 15.5 +/- 1.5 Within 0.5 mi. of Stack D-15 14.2 +/- 0.9 13.0 +/- 0.6 15.0 +/- 0.9 14.6 +/- 0.6 D-16 13.2 +/- 0.9 13.8+/-1.5 13.5+/-1.0 15.7 +/- 1.0 D-17 16.6+/-1.0 18.5 +/- 0.9 18.4 +/- 1.0 17.6 +/- 0.9 D-18 14.2 +/- 0.7 14.6 +/- 0.8 15.4+/-1.3 16.6 +/- 0.5 D-19 13.8+/-1.2 14.1 +/- 0.6 15.6 +/- 0.8 15.7 +/- 0.6 D-20 13.5 +/- 1.0 14.7+/-1.3 15.3+/-1.6 12.9 +/- 1.2 D-21 14.6 +/- 0.7 15.6+/-1.2 15.4 +/- 0.8 16.7 +/- 0.8 D-22 13.1 +/- 0.8 14.8 +/- 0.9 13.9 +/- 0.9 16.7 +/- 0.7 D-23 10.3+/-1.2 9.8 +/- 0.6 11.0 +/- 1.1 11.4 +/- 0.8 D-28 15.8+/-1.1 19.1 +/- 1.0 18.5 +/- 0.9 20.6 +/- 1.1 D-29 15.9+/-1.3 18.2+/-1.5 19.2 +/- 1.6 20.2 +/- 1.0 D-30 15.5 +/- 1.2 16.9+/-1.6 17.9+/-1.3 17.9 +/- 1.6 D-31 15.8 +/- 1.3 18.7+/-1.8 18.0+/-1.3 20.9 +/- 1.5 D-32 15.3 +/- 1.0 16.3+/-1.4 17.2 +/- 0.9 18.2+/-1.5 D-82 13.9 +/- 0.8 13.8 +/- 0.9 13.4 +/- 0.7 14.3 +/- 0.9 D-83 NDa 13.1+/-0.9 17.5+/-1.2 14.4 +/- 0.5 D-84 13.6 +/- 1.1 16.1+/-0.9 15.7+/-1.2 16.7+/-1.1 D-85 15.3 +/- 0.6 14.7 +/- 1.0 16.7 +/- 0.6 16.6+/-1.0 D-86 13.8+/-1.1 16.8+/-1.8 15.4+/-1.0 15.4 +/- 1.6 D-91 15.4 +/- 0.9 18.0+/-1.2 16.8+/-1.1 18.8 +/- 0.8 Mean+/- s.d. 14.4+/-1.4 15.5 +/- 2.4 16.0 +/-2.1 16.6 +/- 2.5 a"ND"= No data; see Table 2.0, Program Deviations.

12-1

Table 12. Ambient gamma radiation as measured by thermoluminescent dosimeters (TLD).

Quarterly collection. Units: mR/91 days Within 1.0 mi. of 1st Qtr. 2nd Qtr. 3rd Qtr. 4th Qtr.

Stack D-43 14.8+/-1.1 13.2+/-1.5 16.5 +/- 0.8 14.6 +/- 1.3 D-44 16.3+/-1.1 20.3 +/- 0.7 18.2+/-1.0 20.6 +/- 0.8 D-45 13.0+/-1.0 14.6 +/- 0.9 14.2 +/- 0.8 16.6+/-1.7 D-46 17.2+/-1.1 20.0+/-1.1 19.8 +/- 1.3 20.0 +/- 1.3 D-47 15.6 +/- 1.0 18.6+/-1.2 17.8 +/- 0.9 20.4 +/- 0.8 D-48 17.3 +/- 1.6 17.0+/-1.0 19.4 +/- 1.7 17.9 +/- 1.5 Mean+/- s.d. 15.7+/-1.6 17.3 +/- 2.9 17.6 +/-2.1 18.4 +/- 2.4 Within 3.0 mi. of Stack D-33 11.0 +/- 0.8 14.5 +/- 0.5 12.4 +/- 0.8 15.0 +/- 0.6 D-34 12.1 +/- 0.8 12.9+/-1.0 12.9 +/- 0.8 14.6+/-1.0 D-35 13.0 +/- 0.8 12.9 +/- 0.9 13.9 +/- 0.6 13.4 +/- 0.7 D-36 13.7+/-1.0 13.5 +/- 0.7 14.7 +/- 0.7 15.5 +/- 0.8 D-37 15.9 +/- 1.6 13.6+/-1.0 16.7+/-1.4 15.3 +/- 1.0 D-38 16.0+/-1.4 16.5+/-1.2 18.0 +/- 1.3 19.2+/-1.2 D-39 14.8 +/- 0.9 16.1 +/- 0.9 15.8 +/- 0.9 17.8 +/- 0.8 D-40 14.8 +/- 0.8 13.3+/-1.0 15.4 +/- 0.8 14.5 +/- 0.6 D-41 16.8+/-1.2 16.0 +/- 1.3 19.2+/-1.7 17.9 +/- 1.3 D-42 14.6 +/- 1.0 17.4 +/- 1.4 16.3+/-1.7 16.6 +/- 0.7 Mean+/- s.d. 14.3+/-1.8 14.7+/-1.7 15.5 +/- 2.2 16.0 +/- 1.8 ISFSI Fenceline D-161 63.1 +/- 3.9 53.3 +/- 3.7 58.4 +/- 3.1 62.9 +/- 3.9 D-162 19.0+/-1.2 17.3 +/- 1.4 18.2 +/- 0.9 18.5 +/- 1.0 D-163 58.6 +/- 3.1 49.6 +/- 2.2 52.3+/-1.4 55.9 +/- 2.6 D-164 16.9+/-1.2 17.2 +/- 0.9 16.6+/-1.1 21.4 +/- 1.4 Mean+/- s.d. 39.4 +/- 24.9 34.4 +/- 19.8 36.4 +/- 22.1 39.7 +/- 23.0 12-2

Table 13. Well water samples, analyses for gamma-emitting isotopes iodine-131 and tritium.

Collection: Monthly Units: pCi/L Location D-52 Drinking Water HP Breakroom TSC PSC HP Breakroom Lab Code DWW- 152 DWW- 376 DWW- 725 DWW- 1228 Date Collected 01-18-21 02-08-21 03-24-21 04-27-21 H-3 < 160 < 161 < 159 < 159 1-131 < 0.3 < 0.4 < 0.3 < 0.4 Mn-54 < 3.8 < 4.2 < 2.5 < 3.1 Fe-59 < 3.0 < 6.1 < 6.3 < 5.2 Co-58 < 2.5 < 3.7 < 2.7 < 4.0 Co-60 < 2.8 < 2.7 < 2.4 < 3.5 Zn-65 < 6.3 < 4.4 < 9.9 < 6.7 Nb-95 < 3.5 < 4.4 < 5.2 < 4.8 Zr-95 < 4.8 < 5.4 < 5.0 < 8.5 1-131 < 4.0 < 4.0 < 5.0 < 6.0 Cs-134 < 4.3 < 4.4 < 4.5 < 4.6 Cs-137 < 2.6 < 2.5 < 4.6 < 2.4 Ba-140 < 12.9 < 13.7 < 12.7 < 11.6 La-140 < 2.6 < 4.3 < 3.4 < 2.9 PSC Lab Code DWW- 1516 DWW- 1953 DWW- 2321 DWW- 2649 Date Collected 05-20-21 06-28-21 07-22-21 08-19-21 H-3 < 158 < 158 < 156 < 157 1-131 < 0.5 < 0.3 < 0.4 < 0.3 Mn-54 < 2.2 < 2.9 < 3.3 < 2.0 Fe-59 < 2.8 < 6.8 < 4.1 < 5.0 Co-58 < 3.3 < 3.4 < 3.5 < 2.9 Co-60 < 3.1 < 1.6 < 2.6 < 2.5 Zn-65 < 4.4 < 2.4 < 3.6 < 3.5 Nb-95 < 3.6 < 1.8 < 2.9 < 2.0 Zr-95 < 4.8 < 3.6 < 3.6 < 4.1 1-131 < 5.6 < 4.3 < 6.1 < 4.5 Cs-134 < 3.5 < 3.5 < 3.9 < 2.9 Cs-137 < 2.5 < 2.2 < 2.0 < 1.9 Ba-140 < 17.8 < 14.3 < 16.5 < 10.6 La-140 < 3.5 < 2.3 < 4.0 < 3.8 13-1

Table 13. Well water samples, analyses for gamma-emitting isotopes iodine-131 and tritium.

Collection: Monthly Units: pCi/L Location D-52 Drinking Water OPS PSC HP Lab Code DWW- 3049 DWW- 3415 DWW- 3841 DWW- 4105 Date Collected 09-14-21 10-14-21 11-10-21 12-15-21 H-3 < 161 < 163 < 162 < 167 1-131 < 0.4 < 0.5 < 0.4 < 0.3 Mn-54 < 1.6 < 2.5 < 3.2 < 3.0 Fe-59 < 5.5 < 3.4 < 6.4 < 3.3 Co-58 < 1.8 < 3.7 < 2.3 < 2.8 Co-60 < 1.7 < 2.5 < 2.0 < 2.1 Zn-65 < 3.9 < 5.9 < 2.5 < 3.8 Nb-95 < 3.0 < 2.2 < 1.9 < 2.9 Zr-95 < 3.8 < 5.0 < 3.3 < 4.2 1-131 < 5.0 < 6.3 < 7.2 < 7.0 Cs-134 < 2.6 < 3.6 < 4.0 < 4.3 Cs-137 < 2.7 < 3.6 < 2.9 < 3.1 Ba-140 < 14.0 < 13.8 < 14.4 < 17.7 La-140 < 3.8 < 4.3 < 2.5 < 1.8 13-2

Table 13. Well water samples, analyses for gamma-emitting isotopes iodine-131 and tritium.

Collection: Monthly Units: pCi/L Location D-53 Treated Municipal Water, Drinking Water Lab Code DWW- 153 DWW- 377 DWW- 726 DWW- 1229 Date Collected 01-18-21 02-08-21 03-24-21 04-27-21 H-3 < 160 < 161 < 159 < 159 1-131 < 0.4 < 0.3 < 0.3 < 0.4 Mn-54 < 2.2 < 2.0 < 3.3 < 3.3 Fe-59 < 6.8 < 4.5 < 4.6 < 2.7 Co-58 < 2.3 < 2.3 < 3.0 < 4.3 Co-60 < 2.6 < 3.0 < 3.7 < 2.7 Zn-65 < 4.4 < 2.5 < 7.1 < 3.1 Nb-95 < 4.7 < 2.5 < 2.8 < 2.6 Zr-95 < 6.4 < 4.3 < 6.2 < 3.7 1-131 < 2.3 < 3.1 < 4.2 < 4.3 Cs-134 < 3.7 < 3.2 < 4.0 < 3.8 Cs-137 < 3.9 < 2.0 < 3.1 < 3.2 Ba-140 < 17.0 < 12.5 < 10.7 < 8.1 La-140 < 5.7 < 3.7 < 4.4 < 2.8 Lab Code DWW- 1517 DWW- 1954 DWW- 2322 DWW- 2650 Date Collected 05-20-21 06-28-21 07-22-21 08-19-21 H-3 < 158 < 158 < 156 < 157 1-131 < 0.4 < 0.4 < 0.3 < 0.3 Mn-54 < 2.6 < 1.2 < 3.8 < 3.4 Fe-59 < 2.1 < 3.3 < 7.0 < 4.6 Co-58 < 2.6 < 2.1 < 3.4 < 3.8 Co-60 < 1.7 < 2.1 < 3.2 < 2.1 Zn-65 < 4.9 < 1.9 < 2.1 < 4.5 Nb-95 < 3.0 < 2.2 < 4.2 < 2.6 Zr-95 < 4.8 < 4.0 < 7.3 < 3.3 1-131 < 4.4 < 4.1 < 6.8 < 3.9 Cs-134 < 2.6 < 2.8 < 3.9 < 3.3 Cs-137 < 3.2 < 2.8 < 3.5 < 2.6 Ba-140 < 11.8 < 13.1 < 17.9 < 15.5 La-140 < 2.6 < 1.5 < 4.6 < 3.1 13-3

Table 13. Well water samples, analyses for gamma-emitting isotopes iodine-131 and tritium.

Collection: Monthly Units: pCi/L Location D-53 Treated Municipal Water, Drinking Water Lab Code DWW- 3050 DWW- 3416 DWW- 3842 DWW- 4106 Date Collected 09-14-21 10-14-21 11-10-21 12-15-21 H-3 < 161 < 163 < 162 < 167 1-131 < 0.5 < 0.5 < 0.4 < 0.3 Mn-54 < 2.7 < 1.6 < 2.6 < 5.7 Fe-59 < 1.7 < 4.4 < 4.4 < 9.2 Co-58 < 1.6 < 1.2 < 2.7 < 4.4 Co-60 < 3.6 < 1.7 < 1.6 < 4.0 Zn-65 < 2.8 < 5.1 < 5.3 < 10.3 Nb-95 < 2.0 < 3.5 < 3.3 < 6.1 Zr-95 < 5.7 < 4.8 < 4.2 < 7.9 1-131 < 8.8 < 4.1 < 6.3 < 9.6 Cs-134 < 3.2 < 2.9 < 3.5 < 7.0 Cs-137 < 3.6 < 3.0 < 2.9 < 4.8 Ba-140 < 18.5 < 14.6 < 14.7 < 24.0 La-140 < 1.9 < 2.5 < 2.9 < 5.1 13-4

Table 13. Well water samples, analyses for gamma-emitting isotopes iodine-131 and tritium.

Collection: Monthly Units: pCi/L Location D-54 Untreated Municipal Water, Drinking Water Lab Code DWW- 154 DWW- 378 DWW- 727 DWW- 1230 Date Collected 01-18-21 02-08-21 03-24-21 04-27-21 H-3 < 160 < 161 < 159 < 159 1-131 < 0.3 < 0.2 < 0.4 < 0.5 Mn-54 < 2.5 < 1.9 < 3.6 < 2.5 Fe-59 < 5.5 < 4.6 < 3.4 < 3.5 Co-58 < 4.0 < 2.7 < 1.9 < 2.7 Co-60 < 3.6 < 3.1 < 2.0 < 2.8 Zn-65 < 5.3 < 7.9 < 6.9 < 5.3 Nb-95 < 4.6 < 3.4 < 2.2 < 4.3 Zr-95 < 5.9 < 5.1 < 6.0 < 5.3 1-131 < 4.6 < 5.7 < 4.3 < 4.3 Cs-134 < 3.7 < 3.6 < 3.4 < 3.3 Cs-137 < 2.9 < 2.9 < 3.7 < 4.2 Ba-140 < 11.3 < 12.4 < 11.5 < 12.4 La-140 < 3.9 < 5.4 < 3.0 < 3.1 Lab Code DWW- 1518 DWW- 1955 DWW- 2323 DWW- 2651 Date Collected 05-20-21 06-28-21 07-22-21 08-19-21 H-3 < 158 < 158 < 156 < 157 1-131 < 0.4 < 0.3 < 0.4 < 0.4 Mn-54 < 2.4 < 3.7 < 2.0 < 1.6 Fe-59 < 1.4 < 7.7 < 5.6 < 2.8 Co-58 < 2.6 < 4.0 < 1.4 < 2.2 Co-60 < 2.5 < 1.8 < 2.1 < 1.7 Zn-65 < 2.9 < 5.1 < 3.1 < 3.0 Nb-95 < 2.6 < 3.4 < 1.9 < 1.9 Zr-95 < 6.0 < 7.0 < 4.2 < 4.8 1-131 < 5.9 < 4.1 < 4.8 < 6.3 Cs-134 < 3.2 < 4.5 < 2.7 < 3.2 Cs-137 < 2.7 < 3.1 < 3.3 < 3.2 Ba-140 < 12.6 < 14.9 < 14.5 < 13.5 La-140 < 2.5 < 2.5 < 2.5 < 1.9 13-5

Table 13. Well water samples, analyses for gamma-emitting isotopes iodine-131 and tritium.

Collection: Quarterly Units: pCi/L Location D-55 On-site Treated Drinking Water Lab Code DWW- 432 DWW- 1519 DWW- 2734 DWW- 3864 Date Collected 02-22-21 05-20-21 08-25-21 11-18-21 H-3 < 161 < 158 < 164 < 161 1-131 < 0.5 < 0.5 < 0.3 < 0.4 Mn-54 < 2.9 < 3.3 < 2.2 < 2.9 Fe-59 < 4.8 < 5.3 < 5.2 < 5.1 Co-58 < 2.4 < 2.1 < 2.5 < 2.4 Co-60 < 3.7 < 2.9 < 2.1 < 3.5 Zn-65 < 6.1 < 8.0 < 4.9 < 3.1 Nb-95 < 3.4 < 4.4 < 3.5 < 4.5 Zr-95 < 5.5 < 5.1 < 4.3 < 3.7 1-131 < 6.8 < 5.3 < 4.7 < 5.3 Cs-134 < 5.6 < 3.6 < 2.7 < 3.1 Cs-137 < 3.9 < 3.2 < 2.8 < 3.2 Ba-140 < 14.8 < 18.2 < 9.1 < 13.8 La-140 < 3.0 < 3.1 < 2.7 < 3.6 Location D-57 Untreated Drinking Water Lab Code DWW- 433 DWW- 1520 DWW- 2735 DWW- 3865 Date Collected 02-22-21 05-20-21 08-25-21 11-18-21 H-3 < 161 < 158 < 164 < 161 1-131 < 0.5 < 0.4 < 0.3 < 0.5 Mn-54 < 2.4 < 2.5 < 2.1 < 2.3 Fe-59 < 5.8 < 3.3 < 4.8 < 3.5 Co-58 < 2.2 < 1.4 < 1.4 < 2.9 Co-60 < 2.4 < 1.7 < 2.3 < 2.4 Zn-65 < 6.0 < 3.9 < 3.0 < 8.3 Nb-95 < 2.1 < 2.4 < 2.2 < 4.0 Zr-95 < 4.7 < 2.8 < 5.1 < 6.2 1-131 < 3.6 < 5.1 < 4.4 < 5.4 Cs-134 < 2.9 < 3.0 < 2.7 < 3.8 Cs-137 < 3.5 < 4.1 < 3.4 < 3.1 Ba-140 < 9.2 < 15.4 < 12.6 < 15.8 La-140 < 3.0 < 1.4 < 3.5 < 4.4 13-6

Table 13. Well water samples, analyses for gamma-emitting isotopes iodine-131 and tritium.

Collection: Quarterly Units: pCi/L Location D-58 Untreated Drinking Water Lab Code DWW- 434 DWW- 1521 NDa No*

Date Collected 02-22-21 05-20-21 08-25-21 11-18-21 H-3 < 161 < 158 1-131 < 0.4 < 0.3 Mn-54 < 3.3 < 3.8 Fe-59 < 5.1 < 5.9 Co-58 < 4.0 < 3.5 Co-60 < 2.4 < 2.2 Zn-65 < 6.9 < 5.8 Nb-95 < 3.1 < 3.2 Zr-95 < 4.3 < 4.9 1-131 < 5.2 < 6.3 Cs-134 < 4.3 < 4.7 Cs-137 < 4.4 < 2.4 Ba-140 < 9.8 < 20.9 La-140 < 2.4 < 3.2 Location D-72(C) Untreated Drinking Water Lab Code DWW- 435 DWW- 1522 DWW- 2736 DWW- 3866 Date Collected 02-22-21 05-20-21 08-25-21 11-18-21 H-3 < 161 < 158 < 164 < 161 1-131 < 0.3 < 0.4 < 0.4 < 0.3 Mn-54 < 1.6 < 3.6 < 2.3 < 6.1 Fe-59 < 7.3 < 6.6 < 3.8 < 14.1 Co-58 < 2.6 < 3.7 < 1.3 < 4.1 Co-60 < 2.5 < 4.5 < 1.7 < 4.3 Zn-65 < 7.2 < 7.0 < 3.0 < 5.8 Nb-95 < 3.2 < 4.4 < 2.1 < 4.7 Zr-95 < 6.5 < 7.3 < 3.1 < 11.1 1-131 < 5.2 < 5.8 < 5.1 < 13.1 Cs-134 < 4.3 < 4.4 < 2.9 < 9.3 Cs-137 < 2.9 < 4.4 < 2.7 < 7.7 Ba-140 < 16.2 < 21.0 < 9.2 < 31.5 La-140 < 4.6 < 3.3 < 3.4 < 6.7 "ND" No data; see Table 2.0, Program Deviations.

13-7

Table 14. Vegetation (broadleaf), analyses for iodine-131 and other gamma-emitting isotopes.

Collection: Annually Units: pCi/g wet Location D-57 D-58 D-59 D-59 Lab Code DVE- 2568 DVE- 2569 DVE- 2737 DVE- 2738 Date Collected 08-10-21 08-10-21 08-25-21 08-25-21 Sample Type Vegetation Vegetation Green Leafy Green Leafy K-40 4.93 +/- 0.60 6.58 +/- 0.52 5.70 +/- 0.28 4.47 +/- 0.26 Mn-54 < 0.022 < 0.017 < 0.007 < 0.009 Fe-59 < 0.051 < 0.031 < 0.027 < 0.012 Co-58 < 0.018 < 0.019 < 0.009 < 0.007 Co-60 < 0.017 < 0.019 < 0.010 < 0.008 Zn-65 < 0.043 < 0.033 < 0.025 < 0.021 Nb-95 < 0.020 < 0.019 < 0.010 < 0.010 Zr-95 < 0.037 < 0.023 < 0.017 < 0.014 Ru-103 < 0.020 < 0.023 < 0.012 < 0.015 Ru-106 < 0.233 < 0.162 < 0.117 < 0.092 1-131 < 0.028 < 0.026 < 0.015 < 0.020 Cs-134 < 0.026 < 0.019 < 0.011 < 0.012 Cs-137 < 0.022 < 0.012 < 0.009 < 0.008 Ce-141 < 0.056 < 0.028 < 0.018 < 0.020 Ce-144 < 0.179 < 0.091 < 0.053 < 0.098 14-1

Table 15. Vegetation (hay and grain), analyses for gamma-emitting isotopes.

Collection: Annually Units: pCi/g wet Location D-16 D-57 Lab Code DVE- 3742 DVE- 3743 Date Collected 11-04-21 11-04-21 Sample Type Beans Corn K-40 13.56 +/- 0.54 3.07 +/- 0.31 Mn-54 < 0.014 < 0.006 Fe-59 < 0.025 < 0.020 Co-58 < 0.013 < 0.012 Co-60 < 0.015 < 0.008 Zn-65 < 0.026 < 0.014 Nb-95 < 0.011 < 0.013 Zr-95 < 0.027 < 0.022 Ru-103 < 0.009 < 0.010 Ru-106 < 0.121 < 0.084 1-131 < 0.017 < 0.019 Cs-134 < 0.013 < 0.012 Cs-137 < 0.013 < 0.009 Ce-141 < 0.018 < 0.021 Ce-144 < 0.081 < 0.085 15-1

Table 16. Surface water samples, analyses for iodine-131, tritium and gamma-emitting isotopes.

Collection: Monthly Units: pCi/L Location: D-49 Lab Code NS" NS" DSW- 715 DSW- 998 DSW- 1408 DSW- 1872 Date Collected 01-13-21 02-11-21 03-23-21 04-13-21 05-11-21 06-15-21 H-3 < 161 < 160 < 158 < 158 1-131 (Chemistry) < 0.4 < 0.3 < 0.5 < 0.3 Mn-54 < 2.4 < 3.0 < 2.7 < 2.4 Fe-59 < 4.2 < 3.2 < 6.2 < 6.5 Co-58 < 2.2 < 2.9 < 3.5 < 2.5 Co-60 < 2.7 < 2.0 < 2.1 < 2.3 Zn-65 < 2.4 < 3.8 < 4.8 < 3.4 Nb-95 < 2.2 < 2.2 < 2.2 < 2.5 Zr-95 < 7.1 < 6.1 < 4.5 < 5.4 1-131 < 3.1 < 4.7 < 3.4 < 5.5 Cs-134 < 4.3 < 4.2 < 3.7 < 3.9 Cs-137 < 3.2 < 2.0 < 2.6 < 3.8 Ba-140 < 13.3 < 16.5 < 14.9 < 14.9 La-140 < 4.5 < 1.8 < 1.9 < 2.7 Lab Code DSW- 2279 DSW- 2652 DSW- 3067 DSW- 3486 DSW- 3861 DSW- 4134 Date Collected 07-20-21 08-19-21 09-21-21 10-18-21 11-16-21 12-21-21 H-3 < 156 < 157 < 161 < 163 < 161 < 167 1-131 (Chemistry) < 0.3 < 0.3 < 0.4 < 0.4 < 0.4 < 0.4 Mn-54 < 2.6 < 4.1 < 2.9 < 1.8 < 2.7 < 2.5 Fe-59 < 5.6 < 6.7 < 5.1 < 4.0 < 3.9 < 3.3 Co-58 < 3.4 < 3.6 < 3.4 < 1.8 < 4.0 < 2.7 Co-60 < 2.1 < 1.5 < 2.3 < 2.0 < 2.1 < 2.3 Zn-65 < 6.6 < 8.1 < 3.2 < 3.0 < 7.5 < 6.9 Nb-95 < 3.6 < 2.8 < 2.2 < 3.1 < 3.0 < 2.7 Zr-95 < 2.8 < 8.1 < 1.9 < 4.5 < 6.2 < 5.1 1-131 < 5.6 < 8.2 < 4.2 < 3.8 < 7.1 < 7.5 Cs-134 < 3.5 < 4.4 < 3.5 < 3.4 < 4.0 < 3.5 Cs-137 < 3.7 < 4.8 < 2.8 < 3.5 < 4.5 < 4.3 Ba-140 < 14.1 < 13.8 < 12.9 < 12.5 < 18.4 < 16.6 La-140 < 3.2 < 2.8 < 1.7 < 2.0 < 2.9 < 2.3

" "NS" = No sample; see Table 2.0, Program Deviations.

16-1

Table 16. Surface water samples, analyses for tritium and gamma-emitting isotopes.

Collection: Monthly Units: pCi/L Location: D-50 Lab Code DSW- 135 NS" DSW- 716 DSW- 999 Date Collected 01-13-21 02-11-21 03-23-21 04-13-21 H-3 < 154 < 161 < 160 Mn-54 < 3.3 < 2.0 < 4.0 Fe-59 < 4.7 < 6.9 < 7.5 Co-58 < 2.8 < 2.8 < 2.7 Co-60 < 2.8 < 1.8 < 1.9 Zn-65 < 4.0 < 3.6 < 8.0 Nb-95 < 3.0 < 4.3 < 3.5 Zr-95 < 4.6 < 6.7 < 5.8 1-131 < 5.4 < 6.2 < 5.7 Cs-134 < 3.0 < 4.4 < 4.9 Cs-137 < 3.0 < 4.2 < 6.1 Ba-140 < 18.3 < 18.8 < 16.3 La-140 < 4.4 < 5.4 < 2.9 a "NS" =No sample; see Table 2.0, Program Deviations.

16-2

Table 16. Surface water samples, analyses for tritium and gamma-emitting isotopes.

Collection: Monthly Units: pCi/L Location: D-51 Lab Code DSW- 136 NSb DSW- 717 DSW- 1000 DSW- 1409 DSW- 1873 Date Collected 01-13-21 02-11-21 03-23-21 04-13-21 05-11-21 06-15-21 H-3 1335 +/-132 a < 161 < 160 < 158 < 158 Mn-54 < 2.6 < 2.2 < 4.2 < 4.1 < 4.2 Fe-59 < 4.6 < 5.1 < 7.5 < 6.6 < 7.7 Co-58 < 2.8 < 1.5 < 3.7 < 3.5 < 2.3 Co-60 < 4.0 < 2.8 < 2.1 < 2.4 < 2.3 Zn-65 < 4.3 < 7.3 < 7.4 < 5.1 < 5.1 Nb-95 < 3.1 < 2.5 < 2.5 < 2.0 < 4.0 Zr-95 < 3.0 < 5.5 < 6.9 < 7.7 < 6.8 1-131 < 6.1 < 6.4 < 4.3 < 5.0 < 3.9 Cs-134 < 3.3 < 3.3 < 5.0 < 4.3 < 3.7 Cs-137 < 2.2 < 2.1 < 4.5 < 3.7 < 3.8 Ba-140 < 11.9 < 20.3 < 19.4 < 17.5 < 11.2 La-140 < 4.1 < 4.1 < 4.0 < 2.8 < 3.0 Lab Code DSW- 2280 DSW- 2653 DSW- 3068 DSW- 3487 DSW- 3862 DSW- 4135 Date Collected 07-20-21 08-19-21 09-21-21 10-18-21 11-16-21 12-21-21 H-3 < 156 < 157 < 161 < 163 < 161 < 157 Mn-54 < 4.4 < 2.8 < 1.3 < 2.3 < 4.0 < 3.1 Fe-59 < 6.5 < 4.7 < 4.4 < 5.3 < 2.7 < 4.0 Co-58 < 3.6 < 3.4 < 1.9 < 1.9 < 3.7 < 2.0 Co-60 < 2.4 < 2.0 < 2.3 < 2.1 < 2.6 < 3.0 Zn-65 < 3.1 < 2.5 < 3.9 < 6.6 < 4.1 < 3.7 Nb-95 < 4.4 < 3.0 < 2.7 < 2.7 < 3.1 < 2.2 Zr-95 < 6.5 < 3.8 < 5.1 < 5.4 < 4.7 < 5.2 1-131 < 9.7 < 6.5 < 3.8 < 4.7 < 6.2 < 4.4 Cs-134 < 4.4 < 3.8 < 2.6 < 3.1 < 4.2 < 2.8 Cs-137 < 3.8 < 2.9 < 3.0 < 2.9 < 2.4 < 2.3 Ba-140 < 20.8 < 14.0 < 11.1 < 14.1 < 15.0 < 11.7 La-140 < 3.8 < 3.2 < 1.0 < 4.5 < 2.9 < 3.9 a Tritium from liquid radwaste system.

b "NS"= No sample; see Table 2.0, Program Deviations.

16-3

Table 16. Surface water samples, analyses for iodine-131, tritium and gamma-emitting isotopes.

Collection: Monthly Units: pCi/L Location: D-61 Lab Code NS8 NS8 DSW- 718 DSW- 1001 DSW- 1410 DSW- 1874 Date Collected 01-13-21 02-11-21 03-23-21 04-13-21 05-11-21 06-15-21 H-3 < 161 < 160 < 158 < 158 1-131 (Chemistry) < 0.2 < 0.3 < 0.5 < 0.4 Mn-54 < 2.8 < 2.4 < 1.7 < 1.7 Fe-59 < 7.6 < 4.5 < 4.1 < 2.5 Co-58 < 4.2 < 2.6 < 2.6 < 1.7 Co-60 < 3.1 < 2.1 < 2.2 < 1.6 Zn-65 < 7.7 < 4.1 < 2.6 < 3.5 Nb-95 < 3.8 < 3.6 < 2.3 < 1.0 Zr-95 < 3.7 < 4.3 < 6.0 < 2.6 1-131 < 6.2 < 2.9 < 5.0 < 2.2 Cs-134 < 5.2 < 3.7 < 3.1 < 1.7 Cs-137 < 4.1 < 2.6 < 3.4 < 1.8 Ba-140 < 19.3 < 13.9 < 14.2 < 7.3 La-140 < 5.0 < 2.7 < 3.0 < 2.2 Lab Code DSW- 2281 DSW- 2654 DSW- 3069 DSW- 3488 DSW- 3863 DSW- 4136 Date Collected 07-20-21 08-19-21 09-21-21 10-18-21 11-16-21 12-21-21 H-3 < 156 < 157 < 161 < 163 < 161 < 167 l-131(Chemistry) < 0.4 < 0.5 < 0.4 < 0.4 < 0.4 < 0.5 Mn-54 < 1.2 < 1.6 < 2.2 < 1.4 < 3.9 < 3.2 Fe-59 < 4.3 < 4.3 < 5.4 < 4.6 < 7.7 < 5.5 Co-58 < 2.3 < 1.6 < 1.7 < 1.4 < 3.0 < 2.9 Co-60 < 2.1 < 2.7 < 2.4 < 2.8 < 3.4 < 2.3 Zn-65 < 2.5 < 2.9 < 5.8 < 2.4 < 6.7 < 6.3 Nb-95 < 2.8 < 2.5 < 1.3 < 1.9 < 4.6 < 3.8 Zr-95 < 5.2 < 4.1 < 4.2 < 4.6 < 5.5 < 5.7 1-131 < 4.5 < 4.4 < 3.2 < 3.7 < 5.8 < 4.9 Cs-134 < 2.6 < 2.8 < 2.6 < 2.7 < 3.0 < 3.3 Cs-137 < 3.3 < 2.7 < 2.5 < 2.5 < 3.4 < 3.7 Ba-140 < 11.7 < 8.7 < 9.0 < 10.9 < 13.0 < 11.0 La-140 < 1.3 < 3.2 < 2.7 < 2.0 < 3.4 < 3.3 "NS" = No sample; see Table 2.0, Program Deviations.

16-4

Table 16. Surface water samples, analyses for tritium and gamma-emitting isotopes.

Collection: Monthly Units: pCi/L Location: D-99 8 8 Lab Code NS NS DSW- 719 DSW- 1002 Date Collected 01-13-21 02-11-21 03-23-21 04-13-21 H-3 < 161 < 160 Mn-54 < 2.1 < 4.2 Fe-59 < 3.7 < 9.5 Co-58 < 3.2 < 3.3 Co-60 < 1.8 < 3.9 Zn-65 < 4.8 < 4.0 Nb-95 < 2.4 < 3.6 Zr-95 < 3.5 < 8.0 1-131 < 3.2 < 5.8 Cs-134 < 3.1 < 4.5 Cs-137 < 2.7 < 4.4 Ba-140 < 4.6 < 13.3 La-140 < 3.0 < 2.4 a "NS" =No sample; see Table 2.0, Program Deviations.

16-5

Table 17. Surface water, analysis for strontium.

Collection: Quarterly composites of monthly samples.

Units: pCi/L Location D-49 Period 1st Qtr. 2nd Qtr. 3rd Qtr. 4th Qtr.

Lab Code DSW-715 DSW-1902 DSW-3097 DSW-4235 Sr-89 < 0.48 < 0.71 < 0.59 < 0.54 Sr-90 < 0.42 < 0.49 < 0.54 < 0.46 Location D-61 Period 1st Qtr. 2nd Qtr. 3rd Qtr. 4th Qtr.

Lab Code DSW-718 DSW-1903 DSW-3098 DSW-4236 Sr-89 < 0.48 < 0.77 < 0.63 < 0.51 Sr-90 < 0.47 < 0.48 < 0.57 < 0.52 17-1

Table 18. Fish, analyses of edible portion for gamma-emitting isotopes.

Collection: Semiannually Units: pCi/g wet Location Upstream, D-49 Lab Code DF- 1501 DF- 1502 Date Collected 05-17-21 05-17-21 Sample Type Channel Catfish Walleye K-40 3.14 +/- 0.38 3.55 +/- 0.45 Mn-54 < 0.020 < 0.012 Fe-59 < 0.030 < 0.047 Co-58 < 0.017 < 0.022 Co-60 < 0.012 < 0.015 Zn-65 < 0.027 < 0.029 Nb-95 < 0.014 < 0.024 Zr-95 < 0.028 < 0.033 Ru-103 < 0.014 < 0.027 Ru-106 < 0.101 < 0.152 Cs-134 < 0.016 < 0.021 Cs-137 < 0.018 < 0.013 Ce-141 < 0.034 < 0.046 Ce-144 < 0.104 < 0.124 Location Upstream, D-49 Lab Code DF- 3166 DF- 3167 Date Collected 09-28-21 09-28-21 Sample Type Channel Catfish Smallmouth Bass K-40 3.09 +/- 0.38 3.66 +/- 0.52 Mn-54 < 0.013 < 0.023 Fe-59 < 0.028 < 0.063 Co-58 < 0.016 < 0.020 Co-60 < 0.014 < 0.015 Zn-65 < 0.031 < 0.034 Nb-95 < 0.020 < 0.022 Zr-95 < 0.029 < 0.039 Ru-103 < 0.023 < 0.047 Ru-106 < 0.112 < 0.214 Cs-134 < 0.014 < 0.023 Cs-137 < 0.018 < 0.021 Ce-141 < 0.025 < 0.056 Ce-144 < 0.102 < 0.167 18-1

Table 18. Fish, analyses of edible portion for gamma-emitting isotopes.

Collection: Semiannually Units: pCi/g wet Location Downstream, D-61 Lab Code OF- 1503 OF- 1504 Date Collected 05-17-21 05-17-21 Sample Type Channel Catfish Smallmouth Bass K-40 3.87 +/- 0.59 3.53 +/- 0.41 Mn-54 < 0.023 < 0.013 Fe-59 < 0.047 < 0.041 Co-58 < 0.020 < 0.016 Co-60 < 0.023 < 0.012 Zn-65 < 0.056 < 0.032 Nb-95 < 0.027 < 0.011 Zr-95 < 0.060 < 0.033 Ru-103 < 0.028 < 0.019 Ru-106 < 0.227 < 0.132 Cs-134 < 0.029 < 0.017 Cs-137 < 0.012 < 0.017 Ce-141 < 0.039 < 0.019 Ce-144 < 0.190 < 0.126 Location D-61 Lab Code OF- 3168 OF- 3169 Date Collected 09-28-21 09-28-21 Sample Type Channel Catfish Walleye K-40 3.96 +/- 0.46 3.72 +/- 0.43 Mn-54 < 0.012 < 0.006 Fe-59 < 0.028 < 0.037 Co-58 < 0.012 < 0.019 Co-60 < 0.012 < 0.012 Zn-65 < 0.026 < 0.023 Nb-95 < 0.015 < 0.028 Zr-95 < 0.048 < 0.040 Ru-103 < 0.025 < 0.020 Ru-106 < 0.103 < 0.102 Cs-134 < 0.018 < 0.014 Cs-137 < 0.012 < 0.012 Ce-141 < 0.050 < 0.028 Ce-144 < 0.109 < 0.080 18-2

Table 19. River sediment, analysis for gamma-emitting isotopes.

Collection: Semiannually Units: pCi/g dry Location D-49 (Control)

Lab Code DBS- 806 DBS- 3040 Date Collected 03-29-21 09-14-21 K-40 8.21 +/- 0.46 7.35 +/- 0.47 Mn-54 < 0.015 < 0.018 Fe-59 < 0.051 < 0.065 Co-58 < 0.014 < 0.014 Co-60 < 0.013 < 0.008 Zn-65 < 0.042 < 0.026 Nb-95 < 0.012 < 0.024 Zr-95 < 0.030 < 0.052 Ru-103 < 0.017 < 0.026 Ru-106 < 0.128 < 0.103 Cs-134 < 0.014 < 0.016 Cs-137 < 0.016 < 0.014 Ce-141 < 0.041 < 0.066 Ce-144 < 0.091 < 0.125 Location D-51 (Discharge)

Lab Code DBS- 807 DBS- 3041 Date Collected 03-29-21 09-14-21 K-40 8.51 +/- 0.41 8.39 +/- 0.56 Mn-54 < 0.011 < 0.023 Fe-59 < 0.036 < 0.045 Co-58 < 0.014 < 0.022 Co-60 < 0.007 < 0.013 Zn-65 < 0.028 < 0.054 Nb-95 < 0.013 < 0.043 Zr-95 < 0.015 < 0.050 Ru-103 < 0.018 < 0.035 Ru-106 < 0.102 < 0.123 Cs-134 < 0.013 < 0.018 Cs-137 < 0.015 < 0.016 Ce-141 < 0.045 < 0.060 Ce-144 < 0.091 < 0.137 19-1

Table 19. River sediment, analysis for gamma-emitting isotopes.

Collection: Semiannually Units: pCi/g dry Location D-107 A (North Drainage Ditch)

Lab Code DBS- 808 Date Collected 03-29-21 K-40 5.18 +/- 0.35 Mn-54 < 0.014 Fe-59 < 0.028 Co-58 < 0.019 Co-60 < 0.011 Zn-65 < 0.030 Nb-95 < 0.028 Zr-95 < 0.026 Ru-103 < 0.021 Ru-106 < 0.106 Cs-134 < 0.011 Cs-137 < 0.013 Ce-141 < 0.042 Ce-144 < 0.050 19-2

Table 20. Groundwater Protection Program Summary.

Precipitation samples for tritium analysis. Units: pCi/L Lab Code Date H-3 Lab Code Date H-3 D-016 D-111 DP- 24 01/05/21 < 153 DP- 26 01/05/21 < 153 DP- 288 02/01/21 < 154 DP- 290 02/01/21 < 154 DP- 506 03/02/21 < 159 DP- 508 03/02/21 < 160 DP- 855 04/02/21 < 156 DP- 858 04/02/21 < 156 D-112 D-114 DP- 27 01/05/21 < 153 ND 8

DP- 291 02/01/21 < 154 ND 8 DP- 509 03/02/21 < 160 ND 8

DP- 859 04/02/21 < 156 ND 8

D-127 D-128 DP- 29 01/05/21 313 +/- 92 DP- 30 01/05/21 < 153 DP- 293 02/01/21 355 +/- 92 DP- 294 02/01/21 < 154 DP- 511 03/02/21 202 +/- 86 DP- 513 03/02/21 < 160 DP- 861 04/02/21 213 +/- 85 DP- 862 04/02/21 < 156 D-081 D-115 DP- 25 01/05/21 < 153 DP- 28 01/05/21 < 153 DP- 289 02/01/21 < 154 DP- 292 02/01/21 < 154 DP- 507 03/02/21 < 160 DP- 510 03/02/21 < 160 DP- 856 04/02/21 < 156 DP- 860 04/02/21 < 156 a No sampler at the location.

20-1

Table 20. Groundwater Protection Program Summary.

Precipitation, monthly collections, analyses for gamma-emitting isotopes.

Location: D-16 Concentration (pCi/L) 54Mn s*Fe 58 Co so Co sszn *sNb *szr 1311 134cs 131cs 140Ba 14oLa Lab Code Date DP- 24 01/05/21 < 20.2 < 22.3 < 21.1 < 18.1 < 31.1 < 23.4 < 27.8 < 17.4 < 19.1 < 19.9 < 80.8 < 17.1 DP- 288 02/01/21 < 15.4 < 24.4 < 12.2 < 17.5 < 27.5 < 13.1 < 22.7 < 22.8 < 17.1 < 21.3 < 66.6 < 22.7 DP- 506 03/02/21 < 22.3 < 26.7 < 21.6 < 17.0 < 38.2 < 25.6 < 20.0 < 16.7 < 20.6 < 24.9 < 96.2 < 20.5 DP- 855 04/02/21 < 3.4 < 5.1 < 3.1 < 2.9 < 6.4 < 3.8 < 4.7 < 3.1 < 3.1 < 3.5 < 16.1 < 3.2 a LLD not met due to a very small sample size.

20-2

Table 20. Groundwater Protection Program Summary.

Ground water, Monitoring wells, analyses for tritium a.

Lab Code Date H-3 (pCi/L) Lab Code Date H-3 (pCi/L)

D-111A (01A)

DWW- 728 03/16/21 < 161 D-111 B (01B)

DWW- 729 03/16/21 < 161 D-112A (02A)

DWW- 730 03/16/21 < 161 D-112B (02B)

DWW- 731 03/16/21 < 161 D-113A (03A)

DWW- 732 03/17/21 < 161 D-113B (03B)

DWW- 733 03/17/21 < 161 DWW- 734 03/17/21 < 161 D-114B (04B)

DWW- 735 03/17/21 < 161 D-115A (05A)

DWW- 736 03/17/21 < 161 D-115B (05B)

DWW- 737 03/17/21 < 161 a Analyses for gamma, gross alpha, Sr-89, Sr-90, Fe-55 and Ni-63 will be performed if tritium activity> 1K pCi/L.

20-3

Table 20. Groundwater Protection Program Summary.

0 Ground water, Monitoring wells, analyses for tritium

• Lab Code Date H-3 (pCi/L) Lab Code Date H-3 (pCi/L)

D-116A (06A)

DWW- 738 03/16/21 < 161 D-116B (06B)

DWW- 739 03/16/21 < 161 D-127A (07A)

DWW- 740 03/16/21 349 +/- 93 DWW- 1875 06/14/21 483 +/- 100 DWW- 2692 08/10/21 403 +/- 97 DWW- 4314 12/18/21 375 +/- 94 D-127B (07B)

DWW- 741 03/16/21 < 161 DWW- 1876 06/14/21 < 158 DWW- 2693 08/17/21 < 164 DWW- 4315 12/18/21 < 156 D-128A (08A)

DWW- 863 03/16/21 4200 +/- 209 DWW- 1623 05/20/21 4772 +/- 224 DWW- 2799 08/10/21 2858 +/- 179 DWW- 4316 12/18/21 989 +/- 120 D-128B (08B)

DWW- 742 03/16/21 518 +/- 101 DWW- 1879 06/14/21 b 9133 +/- 298 DWW- 2800 08/17/21 382 +/- 96 DWW- 4317 12/18/21 495 +/- 100 b Sample possibly mislabelled, station informed, resampling in process.

D-129A (09A)

DWW- 743 03/16/21 167 +/- 84 DWW- 1877 06/14/21 233 +/- 88 DWW- 2694 08/17/21 324 +/- 94 DWW- 4318 12/18/21 317 +/- 91 D-129B (09B)

DWW- 745 03/16/21 < 161 DWW- 1878 06/14/21 219 +/- 87 DWW- 2695 08/17/21 < 164 DWW- 4319 12/18/21 227 +/- 86

• Analyses for gamma, gross alpha, Sr-89, Sr-90, Fe-55 and Ni-63 will be performed if tritium activity> 1K pCi/L .

20-4

Table 20. Groundwater Protection Program Summary.

Ground water, Monitoring wells, analyses for tritium *.

Lab Code Date H-3 (pCi/L) Lab Code Date H-3 (pCi/L)

D-130A (10A)

DWW- 746 03/16/21 < 161 D-1308 (108)

DWW- 747 03/16/21 < 161 D-131A (11A)

DWW- 748 03/17/21 < 161 DWW- 1605 05/20/21 < 165 DWW- 2697 08/17/21 < 164 DWW- 4301 12/21/21 < 156 D-1318 (118)

DWW- 749 03/17/21 < 161 DWW- 1606 05/20/21 < 165 DWW- 2698 08/17/21 < 164 DWW- 4303 12/21/21 216 +/- 86 D-132A (12A)

DWW- 750 03/17/21 259 +/- 89 DWW- 1607 05/20/21 262 +/- 92 DWW- 2801 08/17/21 650 +/- 108 D-1328 (128)

DWW- 751 03/17/21 194 +/- 86 DWW- 1608 05/20/21 180 +/- 88 DWW- 2696 08/17/21 < 164 DWW- 4302 12/21/21 < 156 D-133A (13A)

DWW- 755 03/17/21 < 161 D-1338 (138)

DWW- 756 03/17/21 < 161 D-134A (14A)

DWW- 864 03/16/21 5541 +/- 236 DWW- 1900 06/14/21 9220 +/- 299 DWW- 2802 08/10/21 1912 +/- 153 DWW- 4320 12/18/21 1229 +/- 129

' Analyses for gamma, gross alpha, Sr-89, Sr-90, Fe-55 and Ni-63 will be performed if tritium activity > 1K pCi/L .

20-5

Table 20. Groundwater Protection Program Summary.

Ground water, Monitoring wells, analyses for tritium*.

Lab Code Date H-3 (pCi/L) Lab Code Date H-3 (pCi/L)

D-134B (14B)

D-135A (15A)

DWW- 757 03/17/21 < 161 D-135B (15B)

DWW- 758 03/17/21 < 161 D-136A (16A)

DWW- 759 03/16/21 < 161 D-136B (16B)

DWW- 760 03/16/21 < 161 D-137 (17C)

DWW- 761 03/16/21 < 161 D-62 (18A)

DWW- 865 03/16/21 1293 +/- 131 DWW- 1624 05/20/21 1147+/-129 DWW- 2803 08/10/21 926+/-120 DWW- 4304 12/18/21 502+/-100 D-63 (19A)

DWW- 1880 06/14/21 276 +/- 90 DWW- 2699 08/17/21 274 +/- 91 DWW- 4305 12/18/21 218 +/- 86 a Analyses for gamma, gross alpha, Sr-89, Sr-90, Fe-55 and Ni-63 will be performed if tritium activity > 1K pCi/L .

20-6

Table 20. Groundwater Protection Program Summary.

Ground water, Monitoring wells, analyses for tritium *.

Lab Code Date H-3 (pCi/L) Lab Code Date H-3 (pCi/L)

D-64 (20A)

DWW- 866 03/16/21 599+/-104 DWW- 1881 06/14/21 369 +/- 94 DWW- 2700 08/17/21 246 +/- 90 DWW- 4306 12/18/21 331 +/- 92 D-65 (21A)

DWW- 867 03/16/21 554 +/- 102 DWW- 1882 06/14/21 515 +/- 101 DWW- 2804 08/17/21 409 +/- 98 DWW- 4295 12/18/21 435 +/- 97 D-66 (22A)

DWW- 868 03/16/21 8913 +/- 294 DWW- 1625 05/20/21 23408 +/- 472 DWW- 2805 08/10/21 3208 +/- 188 DWW- 4321 12/18/21 2060 +/- 156 D-67 (23A)

DWW- 869 03/16/21 1611+/-141 DWW- 1901 06/14/21 28095 +/- 512 DWW- 2806 08/10/21 12559 +/- 348 DWW- 4322 12/18/21 2021 +/- 155 D-165 (24A)

DWW- 762 03/17/21 < 161 DWW- 1609 05/20/21 < 165 DWW- 2701 08/17/21 < 164 D-167 (26A)

DWW- 1610 05/20/21 271 +/- 92

' Analyses for gamma, gross alpha, Sr-89, Sr-90, Fe-55 and Ni-63 will be performed if tritium activity > 1 K pCi/L .

20-7

Table 20. Groundwater Protection Program Summary.

Ground water, Monitoring wells, analyses for tritium *.

Lab Code Date H-3 (pCi/L) Lab Code Date H-3 (pCi/L)

D-168A (27A)

DWW- 763 03/16/21 444 +/- 98 D-1688 (278)

DWW- 764 03/16/21 < 161 D-169A (28A)

DWW- 870 03/16/21 962 +/- 119 DWW- 1613 05/19/21 405 +/- 99 DWW- 2702 08/16/21 299 +/- 92 DWW- 4296 12/18/21 < 156 D-1698 (288)

DWW- 766 03/16/21 < 161 DWW- 1614 05/19/21 < 165 DWW- 2703 08/16/21 < 164 DWW- 4297 12/21/21 < 156 D-170A (29A)

DWW- 767 03/16/21 < 161 DWW- 1615 05/19/21 245 +/- 91 DWW- 2704 08/16/21 < 164 DWW- 4298 12/18/21 < 156 D-1708 (298)

DWW- 768 03/16/21 < 161 DWW- 1616 05/19/21 < 165 DWW- 2705 08/16/21 < 164 DWW- 4299 12/21/21 < 156 D-171A (30A)

DWW- 769 03/16/21 < 161 DWW- 1617 05/19/21 < 165 DWW- 2706 08/16/21 < 164 DWW- 4307 12/21/21 < 156 D-1718 (308)

DWW- 770 03/16/21 < 159 DWW- 1618 05/19/21 < 165 DWW- 2707 08/16/21 < 164 DWW- 4308 12/21/21 < 156 a Analyses for gamma, gross alpha, Sr-89, Sr-90, Fe-55 and Ni-63 will be performed if tritium activity > 1 K pCi/L .

20-8

Table 20. Groundwater Protection Program Summary.

Ground water, Monitoring wells, analyses for tritium *.

Lab Code Date H-3 (pCi/L) Lab Code Date H-3 (pCi/L)

D-172A (31A)

DWW- 771 03/16/21 < 159 D-172B (31B)

DWW- 772 03/16/21 < 159 D-173A (32A)

DWW- 773 03/16/21 235 +/- 91 DWW- 1619 05/19/21 < 165 DWW- 2709 08/16/21 191 +/- 87 DWW- 4310 12/18/21 181 +/- 84 D-173B (32B)

DWW- 774 03/16/21 < 159 DWW- 1620 05/19/21 < 165 DWW- 2710 08/16/21 < 164 DWW- 4311 12/18/21 186 +/- 84 D-79 MW-33A DWW- 775 03/16/21 < 159 DWW- 1621 05/19/21 < 165 DWW- 2711 08/16/21 < 164 DWW- 4312 12/18/21 < 156 D-80 MW-34A DWW- 776 03/16/21 161 +/- 87 DWW- 1622 05/19/21 183 +/- 88 DWW- 2712 08/16/21 < 164 DWW- 4313 12/18/21 < 156 D-81 MW-35A DWW- 777 03/16/21 190 +/- 89 DWW- 1612 05/19/21 173 +/- 87 DWW- 2713 08/10/21 304 +/- 93 DWW- 4300 12/18/21 169 +/- 83

• Analyses for gamma, gross alpha, Sr-89, Sr-90, Fe-55 and Ni-63 will be performed if tritium activity > 1K pCi/L .

20-9

Table 20. Groundwater Protection Program Summary.

D-119 (2MH209)

D-121 (2MH211)

DSW- 752 03/23/21 < 161 D-122 (Sluice Pond)

DSW- 753 03/23/21 < 161 DSW- 1231 04/24/21 < 159 D-123 (S. Drainage Ditch)

D-124 (N. Drainage Ditch)

DSW- 754 03/23/21 < 161 D-125 (Onsite S. Storm Drain Outfall)

DSW- 1003 04/13/21 239 +/- 90 DSW- 1411 05/11/21 No sample D-125A D-1258 D-125C D-125D D-125E (1MH213) D-25 (MH105)

MH-217 D-27 (MH-107)

MH-219 D-24 (MH-104)

MH-102 D-26 (MH-106) 20-10

Table 20. Groundwater Protection Program Summary.

Monitoring wells, analyses for gamma-emitting isotopes.

Collection Lab Code Date D-127A (MW-07A)

D-128A (MW-OBA)

DWW- 863 3/16/2021 < 2.3 < 6.6 < 2.8 < 1.7 < 4.2 < 4.3 < 4.5 < 2.2 < 2.3 < 37.6 < 7.5 DWW- 1623 5/20/2021 < 1.1 < 4.3 < 1.3 < 1.6 < 3.8 < 3.2 < 3.5 < 2.0 < 1.8 < 31.2 < 5.0 DWW- 2799 8/10/2021 < 1.7 < 5.1 < 2.2 < 1.9 < 3.5 < 3.4 < 4.0 < 1.7 < 1.9 <35.2 <13.7 D-1288 (MW-088)

DWW- 1879 6/14/2021 a < 2.0 < 4.1 < 1.7 < 1.6 < 3.2 < 3.4 < 3.5 < 1.9 < 1.8 < 33.0 < 8.6 D-134A (MW-14A)

DWW- 864 3/16/2021 < 2.3 < 4.3 < 1.4 < 1.7 < 2.4 < 3.0 < 3.5 < 2.0 < 1.9 < 39.0 < 7.9 DWW- 1900 6/14/2021 < 1.7 < 5.4 < 1.6 < 1.4 < 2.9 < 2.6 < 3.0 < 1.6 < 1.4 < 20.0 < 8.0 DWW- 2802 8/10/2021 < 1.7 < 4.7 < 1.8 < 2.1 < 3.8 < 3.1 < 5.6 < 2.1 < 1.5 < 48.2 < 5.8 D-62 (MW-18A)

DWW- 865 3/16/2021 < 1.9 < 5.7 < 2.1 < 1.5 < 3.9 < 3.8 < 4.2 < 1.8 < 1.5 < 36.9 < 11.7 DWW- 1624 5/20/2021 < 2.2 < 3.9 < 2.5 < 1.3 < 2.3 < 2.6 < 3.9 < 2.1 < 2.1 < 37.5 < 7.7 D-63 (MW-19A)

D-65 (MW-21 A)

D-66 (MW-22A)

DWW- 868 3/16/2021 < 2.0 < 4.6 < 2.5 < 1.5 < 4.3 < 3.9 < 4.1 < 2.2 < 2.0 < 58.9 < 12.0 DWW- 1625 5/20/2021 < 1.4 <4.4 < 2.4 < 1.8 < 3.5 < 3.6 < 2.6 < 1.8 < 2.0 < 29.6 < 8.9 DWW- 2805 8/10/2021 < 1.8 < 4.3 < 1.9 < 1.3 < 3.3 < 2.8 < 4.4 < 1.7 < 1.4 < 35.4 < 7.8 a Sample possibly mislabelled, station informed, resampling in process.

20-11

Table 20. Groundwater Protection Program Summary.

Monitoring wells, analyses for gamma-emitting isotopes.

Collection Lab Code Date s4Mn sgFe ssco ea Co eszn gs Nb gszr 134Cs 137Cs 140Ba 140La D-67 (MW-23A)

DWW- 869 3/16/2021 < 1.4 < 5.3 < 2.4 < 1.6 < 3.1 < 3.8 < 3.8 < 1.7 < 1.5 < 37.2 < 6.0 DWW- 1901 6/14/2021 < 2.0 < 5.1 < 1.6 < 1.9 < 3.5 < 3.5 < 4.0 < 1.8 < 2.2 < 28.9 < 6.7 DWW- 2806 8/10/2021 < 2.0 < 5.2 < 1.9 < 1.5 < 4.1 < 3.2 <4.5 < 2.1 < 2.0 < 38.2 < 7.6 28A 20-12

Table 20. Groundwater Protection Program Summary.

8 Monitoring wells, conditional analyses for gross alpha, iron-55, nickel-63, strontium-89 and strontium-90

• Collection Lab Code Date Location Gross Alpha 55Fe 63Ni assr sosr DWW- 863 3/16/2021 d-128a < 2.0 < 623 < 68 < 0.8 < 0.5 DWW- 864 3/16/2021 d-134a < 2.4 < 619 < 69 < 0.8 < 0.5 DWW- 865 3/16/2021 mw-18a 3.8 +/- 2.0 < 615 < 68 < 0.7 < 0.5 DWW- 868 3/16/2021 mw-22a < 1.7 < 627 < 70 < 0.7 < 0.4 DWW- 869 3/16/2021 mw-23a < 2.4 < 611 < 70 < 0.7 < 0.5 DWW- 1623 5/20/2021 d-128a < 2.3 < 676 < 76 < 1.5 < 1.1 DWW- 1624 5/20/2021 mw-18a 3.0+/-1.7 < 702 < 70 < 1.7 < 1.1 DWW- 1625 5/20/2021 mw-22a 2.9+/-1.9 < 644 < 69 < 2.0 < 1.1 DWW- 1879 6/14/2021 d-128b < 1.4 < 686 < 68 < 1.5 < 1.0 DWW- 1900 6/14/2021 d-134a < 1.8 < 673 < 66 < 1.6 < 1.0 DWW- 1901 6/14/2021 mw-23a < 1.4 < 673 < 66 < 1.4 < 0.9 DWW- 2799 8/10/2021 d-128a < 1.5 < 581 < 65 < 1.5 < 0.8 DWW- 2802 8/10/2021 d-134a < 1.8 < 599 < 69 < 1.5 < 0.9 DWW- 2805 8/10/2021 mw-22a < 2.3 < 571 < 69 < 1.8 < 1.0 DWW- 2806 8/10/2021 mw-23a < 2.7 < 574 < 65 < 1.9 < 1.0 a Analyses for gamma, gross alpha, Sr-89, Sr-90, Fe-55 and Ni-63 will be performed if tritium activity > 1K pCi/L .

b Sample possibly mislabelled.

20-13