L-MT-20-013, 2019 Annual Radiological Environmental Operating Report

2019 Annual Radiological Environmental Operating Report

ML20135H150
Person / Time
Site:	Monticello
Issue date:	05/14/2020
From:	Conboy T Northern States Power Co, Xcel Energy
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-MT-20-013
Download: ML20135H150 (158)

Text

Xcel Energy RESPONSIBLE BY NATURE 2807 West County Road 75 Monticello, MN 55362 May 14, 2020 L-MT-20-013 10 CFR 50, Appendix I ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 Monticello Nuclear Generating Plant Docket No. 50-263 Renewed Facility Operating License No. DPR-22 2019 Annual Radiological Environmental Operating Report Pursuant to 10 CFR 50, Appendix I, Section IV.B.2, IV.B.3, IV.C and, in accordance with Monticello Nuclear Generating Plant (MNGP) Technical Specifications 5.6.1, the Northern States Power Company, a Minnesota corporation (NSPM), d/b/a Xcel Energy, is submitting the Annual Radiological Environmental Operating Report, under MNGP's "Radiological Environmental Monitoring Program," for year 2019.

Summary of Commitments This letter makes no new commitments and no revisions to existing commitments.

Thomas A. Conboy Site Vice President, Monticello Nuclear Generating Plant Northern States Power Company - Minnesota Enclosure cc: Administrator, Region 111, USNRC Project Manager, Monticello, USNRC Resident Inspector, Monticello, USNRC Minnesota Department of Commerce

Document Control Desk Page 2 ENCLOSURE RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM JANUARY 1 - DECEMBER 31, 2019

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT (AREOR)

Monticello Nuclear Generating Plant Last Updated: 4/27/2020

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT Monticello Nuclear Generating Plant Heather Baxter Prepared for:

Principal Scientist & Technical Lead Xcel Energy, Inc.

Prepared by:

Arcadis US, Inc.

630 Plaza Drive Suite 200 Highlands Ranch Colorado 80129 Eric Cowan Our Ref.:

Quality Assurance Reviewer 30008742 Date: 4/27/2020 Jesse Toepfer, PhD Program Manager arcadis.com

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT CONTENTS Acronyms and Abbreviations ......................................................................................................................... v References .................................................................................................................................................. vii Executive Summary................................................................................................................................. ES-1 Summary of Activities and Results ................................................................................................... ES-1 1 Introduction ............................................................................................................................................. 2 1.1 Site Description and Sample Locations .......................................................................................... 4 1.2 Scope and Requirements of the REMP .......................................................................................... 4 2 Radiological Environmental Sampling Program Requirements .............................................................. 6 2.1 Exposure Pathway and Sample Locations ..................................................................................... 6 2.2 Maps of Sample Locations ........................................................................................................... 14 3 Statistical and Calculational Methodology ............................................................................................ 19 3.1 Trend Identification ....................................................................................................................... 19 3.2 Estimation of the Mean Value ....................................................................................................... 19 3.3 Lower Limit of Detection and Minimum Detectable Activity .......................................................... 20 3.4 Reporting Levels and Lower Limits of Detection for Radioactivity ............................................... 20 4 Interpretation of Results ........................................................................................................................ 25 4.1 Airborne Radioiodine and Particulates ......................................................................................... 25 4.2 Drinking Water .............................................................................................................................. 27 4.3 River Water ................................................................................................................................... 27 4.4 Groundwater ................................................................................................................................. 27 4.5 Broadleaf Vegetation .................................................................................................................... 28 4.6 Food Products ............................................................................................................................... 28 4.7 Fish ............................................................................................................................................... 28 4.8 Aquatic Invertebrates .................................................................................................................... 28 4.9 Shoreline Sediment....................................................................................................................... 29 4.10 Direct Gamma Radiation .............................................................................................................. 30 5 Land Use Census.................................................................................................................................. 33 5.1 Purpose ......................................................................................................................................... 33 5.2 Methodology ................................................................................................................................. 34 arcadis.com i

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 5.3 2019 Land Use Census ................................................................................................................ 34 6 Quality Assurance ................................................................................................................................. 37 6.1 Sample Collection ......................................................................................................................... 37 6.2 Sample Analysis ........................................................................................................................... 37 6.3 Dosimetry Analysis ....................................................................................................................... 37 6.4 Laboratory Equipment Quality Assurance .................................................................................... 37 6.5 General Engineering Laboratory, LLC (GEL) ............................................................................... 38 6.6 Environmental Dosimetry Company ............................................................................................. 38 7 Environmental Sampling Modifications ................................................................................................. 39 7.1 Program Modifications .................................................................................................................. 39 7.2 Change of Sampling Procedures .................................................................................................. 39 7.3 Change of Analysis Procedures ................................................................................................... 40 7.4 Sample Deviations and Unavailable Analysis .............................................................................. 41 7.5 Analytical Deviations ..................................................................................................................... 42 8 Radiological Environmental Monitoring Program - Summary of Results ............................................. 43 8.1 Radiological Environmental Monitoring Program Data Summary ................................................ 43 9 Errata to Previous Reports .................................................................................................................... 48 9.1 Errata to the MNGP AREOR ........................................................................................................ 48 10 Radiological Environmental Monitoring Program Results .................................................................... 49 10.1 Detection of activity ....................................................................................................................... 50 arcadis.com ii

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT TABLES Table 2.1-1: Monticello Nuclear Generating Plant Radiological Environmental Monitoring Program Sample Collection and Analysis: Airborne (ODCM 07.01 Table 1) ........................................................ 6 Table 2.1-2: Monticello Nuclear Generating Plant Radiological Environmental Monitoring Program Sample Collection and Analysis: Direct Radiation (ODCM 07.01 Table 1) ............................................ 7 Table 2.1-3: Monticello Nuclear Generating Plant Radiological Environmental Monitoring Program Sample Collection and Analysis: Waterborne (ODCM 07.01 Table 1) ................................................... 8 Table 2.1-4: Monticello Nuclear Generating Plant Radiological Environmental Monitoring Program Sample Collection and Analysis: Ingestion (ODCM 07.01 Table 1) ....................................................... 9 Table 2.1-5: Monticello Nuclear Generating Plant Radiological Environmental Monitoring Program Sample Collection and Analysis (ODCM 07.01 Table 4) ...................................................................... 10 Table 3.4-1: Reporting Levels for Radioactivity Concentration in Environmental Samples ........................ 21 Table 3.4-2: Maximum Values for the Lower Limits of Detection (LLD) ...................................................... 22 Table 3.4-3: Analysis and Frequency of Samples ....................................................................................... 23 Table 5.3-1: Changes in Land Use Census from 2018 to 2019 .................................................................. 36 Table 5.3-2: Summary of Highest Location for each pathway in 2019 ....................................................... 36 Table 7.4-1: Sample Deviations and Unavailable Analysis ......................................................................... 41 Table 7.5-1: Analytical Deviations for Lanthanum-140 ............................................................................... 42 Table 8.1-1: Radiological Environmental Monitoring Program Summary ................................................... 44 DATA TABLES Airborne Cartridge: Radioiodine .................................................................................................................. 51 Airborne Particulates: Gross Beta ............................................................................................................... 54 Airborne Particulates: Gamma Isotopic ....................................................................................................... 56 Sediment: Gamma Isotopic ......................................................................................................................... 61 Tissue - Fish: Gamma Isotopic .................................................................................................................... 63 Tissue - Invertebrate: Gamma Isotopic ....................................................................................................... 64 Tissue - Plant: Gamma Isotopic ................................................................................................................. 65 Water: Tritium .............................................................................................................................................. 65 Water - Drinking: Gross Beta ...................................................................................................................... 66 Water - Drinking: Iodine-131 ....................................................................................................................... 67 Water - Groundwater: Gamma Isotopic ...................................................................................................... 68 arcadis.com iii

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Water - Drinking: Gamma Isotopic .............................................................................................................. 72 Water - Surface: Gamma Isotopic ............................................................................................................... 73 Direct Radiation - TLD: Gamma ................................................................................................................. 76 Direct Radiation - ISFSI: Gamma ............................................................................................................... 78 FIGURES Figure 1.0-1: Monitored Potential Exposure Pathways ................................................................................. 3 Figure 2.2-1: Radiation Environmental Monitoring Program (ODCM 07.01 Figure 1) ................................ 14 Figure 2.2-2: 4 - 5 Mile Ring and Special Interest TLD Locations (ODCM 07.01 Figure 2) ....................... 15 Figure 2.2-3: Site Boundary TLD Locations (ODCM 07.01 Figure 3) ......................................................... 16 Figure 2.2-4: Control Locations (ODCM 07.01 Figure 4) ............................................................................ 17 Figure 2.2-5: ISFSI TLD Locations (ODCM 07.01 Figure 5) ....................................................................... 18 Figure 4.1-1: Graph of Historical Airborne Particulate Gross Beta ............................................................. 25 Figure 4.1-2: Graph of 2019 Average Airborne Particulate Gross Beta for Indicator and Control Locations ............................................................................................................................................... 26 Figure 4.2-1: Graph of Historical Gross Beta for Drinking Water Sample ................................................... 27 Figure 4.9-1: Graph of Historical Cs-137 in River Sediment ....................................................................... 29 Figure 4.10.1-1: Graph of Direct Gamma Radiation Measurements........................................................... 30 Figure 4.10.1-2: Graph of Historical Direct Gamma Measurements ........................................................... 31 EQUATIONS Equation 1 ................................................................................................................................................... 19 APPENDICES Appendix A GEL Laboratories, LLC 2019 Annual Quality Assurance Report Appendix B Environmental Dosimetry Company, Annual Quality Assurance Status Report, January -

December 2019 arcadis.com iv

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT ACRYONYMS AND ABBREVIATIONS AREOR Annual Radiological Environmental Operating Report BTP Radiological Assessment Branch Technical Position, Rev. 1, on Radiological Monitoring CFR Code of Federal Regulations d/b/a doing business as D/Q deposition coefficient E East EDC Environmental Dosimetry Company ENE East-Northeast ESE East-Southeast ft feet ft2 square feet GEL General Engineering Laboratories LLC GPS Global Positioning System I-131 iodine-131 ISFSI Independent Spent Fuel Storage Installation LLD lower limit of detection MDA minimum detectable activity mi mile MNGP Monticello Nuclear Generating Plant mrem millirem MWe megawatt electric N North NE Northeast NIST National Institute of Standards and Technology NNE North-Northeast NNW North-Northwest NRC Nuclear Regulatory Commission NW Northwest OCA owner-controlled area arcadis.com v

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT ODCM Offsite Dose Calculation Manual pCi/g picocurie per gram pCi/L picocurie per liter pCi/kg picocurie per kilogram pCi/m3 picocurie per cubic meter REMP Radiological Environmental Monitoring Program S South SE Southeast SSE South-Southeast std quarter Standard quarter, 91 days SSW South-Southwest SW Southwest TLD thermoluminescent dosimeter UFSAR Updated Final Safety Analysis Report USB Universal Serial Bus W West WNW West-Northwest WSW West-Southwest arcadis.com vi

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT REFERENCES Arnold, J.R., and H.A. Al-Salih. 1955. Beryllium-7 Produced by Cosmic Rays. Science. April 121(3144):

451-453.

MNGP Chemistry Manual, Procedure I.05.41, Annual Land Use Census and Critical Receptor Identification.

NRC Generic Letter 79-65 Radiological Environmental Monitoring Program Requirements Enclosing Branch Technical Position (BTP), Revision 1, November 1979.

NUREG 1302 Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Boiling Water Reactors, April 1991 Offsite Dose Calculation Manual (ODCM) 07.01 Monticello Nuclear Generating Plant, Revision 25.

Offsite Dose Calculation Manual (ODCM) 07.01 Monticello Nuclear Generating Plant, Revision 26.

Regulatory Guide 4.15 Quality Assurance for Radiological Monitoring Programs, Revision 1, 1979.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT EXECUTIVE

SUMMARY

This 2019 Annual Radiological Environmental Operating Report (AREOR) describes the Monticello Nuclear Generating Plant (MNGP) Radiological Environmental Monitoring Program (REMP) and program results for January 1 through December 31, 2019. MNGP is operated by Northern States Power Company, a Minnesota corporation, d/b/a Xcel Energy (Xcel) under a license granted by the U.S.

Nuclear Regulatory Commission (NRC).

Provisions of NRCs NUREG-1302, NRC Generic Letter 79-65 Branch Technical Position, MNGP Technical Specifications, and MNGPs Offsite Dose Calculation Manual (ODCM) establish the requirements of the REMP. This report describes the purpose and scope of MNGPs REMP, along with the monitoring and sampling results for the reporting period.

Report Contents This AREOR includes the following:

Identification of sampling locations Descriptions of environmental sampling and analysis procedures Comparisons of present environmental radioactivity levels and historical environmental data Analysis of trends in environmental radiological data as potentially affected by plant operations Summary of environmental radiological sampling results Photo Credit: Daniel Thurston, Chemistry Supervisor, MNGP Quality assurance practices, sampling deviations, unavailable samples, and program changes. Plant Stack, used for dispersing treated gaseous effluents, Monticello Nuclear Generating Plant in Winter Summary of Activities and Results Sampling activities were conducted as prescribed by MNGPs ODCM. Required analyses were performed and detection capabilities were met for the collected samples required by the ODCM. To compile data for this AREOR, 865 samples were analyzed, yielding 1,961 test results. Based on the annual MNGP Land Use Census, the current number of sampling sites for MNGP is sufficient. Concentrations observed in the environment in 2019 for plant-related radionuclides were within the ranges of concentrations observed in the past. The continued operation of the plant has not contributed measurable radiation or the presence of gamma radioactivity.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 1 INTRODUCTION Photo Credit: Daniel Thurston, Chemistry Supervisor, MNGP Welcome to Monticello Nuclear Generating Plant The Radiological Environmental Monitoring Program (REMP) for the Monticello Nuclear Generating Plant (MNGP),1 located in Monticello, Minnesota, provides data on measurable levels of radiation and radioactive materials in the areas surrounding the Site 2 and evaluates the relationship between quantities of radioactive materials released from the plant and the resultant doses to individuals from principal pathways of exposure. At any given nuclear utility in the United States, REMPs are designed to provide a check on a nuclear utilitys Effluent Release Program 3 and dispersion modeling to ensure that radioactive effluent concentrations in the air, terrestrial, and aquatic environments conform to the As Low As Reasonably Achievable (ALARA) design objectives of Appendix I of Chapter 10 of the Code of Federal Regulations (CFR) Part 50.

This 2019 Annual Radiological Environmental Operating Report (AREOR) has been prepared by Arcadis U.S., Inc. and presents an interpretation and summary of the environmental data from exposure pathways, interpretations of that data, along with analyses and trends of the results covering the January, to December 2019, period.

1 In this document, a distinction is made between MNGP, Site, and Plant. MNGP is the name of the facility. Site refers to the entire areal extent of MNGPs property, including the uncontrolled and controlled areas. Plant refers to the controlled area. The REMP involves monitoring and sampling at various locations across the Site and offsite locations.

2 Referred to as the Site environs.

3 The Effluent Release Program is separate but related to the REMP. Both are required by federal regulations.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Figure 1.0-14 below illustrates various exposure pathways5 for receptors.6 Routinely monitored pathways include ingestion, inhalation, and direct radiation. Exposure pathways are based on Site-specific information, such as the locations and habitats of receptors, the ages of these receptors, and the distance and relationship of these receptors with respect to release points and water usage around the Plant. A Site-specific REMP has been developed and maintained in accordance with MNGPs Offsite Dose Calculation Manual (ODCM), NUREG-1302, and the Branch Technical Position on Radiological Environmental Monitoring.

Figure 1.0-1 Monitored Potential Exposure Pathways.

4 Image Credit: Jesse R. Toepfer, © 2020.

5 An exposure pathway describes the route of the radiological exposure from a source. The primary form of radiological emissions from the Plant are airborne discharges. The following pathways are monitored as part of MNGPs REMP: external dose, ingestion of radioactive materials, and inhalation of radioactive material.

6 Living things that can be affected by radioactive effluent releases are referred to as environmental receptors.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 1.1 Site Description and Sample Locations 1.1.1 Site Description Located in Wright County, Minnesota, MNGP is located along the Mississippi River and is about 40 miles northwest of the Twin Cities of Minneapolis and St. Paul. MNGP generates commercial electrical power via a boiling water reactor with a nominal generating capacity of 681 megawatts electric (MWe).

Commercial production was initiated on June 30, 1971.

1.1.2 Rationale for Sample Locations Although the contribution to background radiation is very small the REMP was established to assess the exposure pathways to humans. Specific methods and different environmental media are required to assess each pathway. Sampling locations for the Site are chosen based upon meteorological factors, preoperational monitoring, and results of the land use surveys. A number of sample points are selected as control locations, because they are distant enough to preclude any plant effect and thus, unaffected by Site operations. MNGPs REMP sampling locations and the TLD monitoring locations are discussed in Section 2 of this report.

1.2 Scope and Requirements of the REMP MNGPs REMP is based on U.S. Nuclear Regulatory Commission (NRC) guidance, and is conducted in accordance with MNGPs ODCM, and is furthermore guided by applicable procedures for sample media, sampling locations, sampling frequency, and analytical sensitivity requirements. Indicator and control locations were established for comparison purposes to distinguish radioactivity of originating from the Plant versus that from natural or other anthropogenic7 sources. This program provides for surveillance of appropriate critical exposure pathways to man, protects vital interests of members of the public, and is intended to satisfy compliance with state and federal environmental agencies. Section 3 lists the reporting levels and sample collection frequency for detection of radioactivity in the environment.

7 An anthropogenic source refers to radioactivity from a manmade substance, as well as radioactivity from natural sources that would not otherwise normally be present in the environment either in an amount, concentration, and/or at a specified rate, without human intervention.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Photo Credit: Daniel Thurston, Chemistry Supervisor, MNGP Blooming Trees at Monticello Nuclear Generating Plant The Annual Land Use Census, required by MNGPs ODCM, is performed to ensure changes in the use of areas at or beyond the Site boundary are identified and that appropriate modifications to the REMP are made if necessary. This census satisfies the requirements of Section IV.B.3 of Appendix I to 10 CFR 50.

Results are described in Section 5 of this document.

In addition, participation in an interlaboratory comparison program is performed in fulfillment of MNGPs ODCM operational requirements. The comparison program provides for independent checks on the precision and accuracy of measurements of radioactive material in REMP sample matrices. These checks are performed as part of the quality assurance (QA) program for environmental monitoring to demonstrate that the results are valid for the purposes of Section IV.B.2 of Appendix I to 10 of CFR Part 50 and Regulatory Guide 4.15 Quality Assurance for Radiological Environmental Monitoring Programs.

Appendix A of this 2019 AREOR summarizes the results obtained as part of this comparison program.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 2 RADIOLOGICAL ENVIRONMENTAL SAMPLING PROGRAM REQUIREMENTS Figures 2.2-1 through 2.2-5 depict MNGPs REMP sampling locations and the TLD monitoring locations.

The location numbers shown on these maps correspond to those listed in Tables 2.1-2 through 2.1-4.

Guidance for the format and layout of these tables and figures is derived from MNGPs ODCM.

2.1 Exposure Pathway and Sample Locations Table 2.1-1 below presents the sample frequency and collection, analysis type, and number of samples versus their locations for airborne radioiodine and particulates.

Table 2.1-1: Monticello Nuclear Generating Plant Radiological Environmental Monitoring Program Sample Collection and Analysis: Airborne (ODCM 07.01 Table 1)

Exposure Pathway Number of Samples and Sample Sampling and Type and Frequency of and/or Sample Locations** Collection Frequency Analysis

1. Airborne Samples from five locations: Continuous sampler Radioiodine analysis Weekly Radioiodine & three samples from offsite locations operation with sample for I-131 Particulates (in different sectors) of the highest collection weekly.

calculated annual average ground Particulate:

level D/Q, one sample from the Gross beta activity on each vicinity of a community having the filter weekly*. Analysis highest calculated annual average SHALL be performed more ground-level D/Q, and one sample than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> following filter from a control location specified in change.

Table 2.1-5. Perform gamma isotopic analysis on composite (by location) sample quarterly.

Notes:

• If gross beta activity in any indication sample exceeds 10 times the yearly average of the control sample, a gamma isotopic analysis is required.

• • Sample locations are further described in Table 2.1-5.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Table 2.1-2 below presents the sample frequency and collection, analysis type, and number of samples versus their locations for direct radiation.

Table 2.1-2: Monticello Nuclear Generating Plant Radiological Environmental Monitoring Program Sample Collection and Analysis: Direct Radiation (ODCM 07.01 Table 1)

Exposure Pathway Number of Samples and Sample Sampling and Type and Frequency of and/or Sample Locations** Collection Frequency Analysis

2. Direct Radiation 40 TLD stations established with Quarterly Gamma/Neutron Dose duplicate dosimeters placed at the quarterly following locations:****

1. Using the 16 meteorological sectors as guidelines, an inner ring of stations in the general area of the site boundary is established and an outer ring of stations at a distance of 4 to 5 miles distance from the MNGP is established.

Because of inaccessibility, two sectors in the inner ring are not covered.

2. Ten dosimeters are established at special interest areas and four control stations.

3. Three neutron and gamma dosimeter sets are located along the OCA fence. Additionally, three neutron dosimeters are stationed with special interest and inner ring TLDs and four neutron control dosimeters are stationed with the REMP control TLDs.

Notes:

• • Sample locations are further described in Table 2.1-5.

• • • • Three control TLD locations have only one dosimeter.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Table 2.1-3 below presents the sample frequency and collection, analysis type, and number of samples versus their locations for waterborne pathways.

Table 2.1-3: Monticello Nuclear Generating Plant Radiological Environmental Monitoring Program Sample Collection and Analysis: Waterborne (ODCM 07.01 Table 1)

Exposure Pathway Number of Samples and Sampling and Type and Frequency of and/or Sample Sample Locations* Collection Frequency Analysis

3. Waterborne

a. Surface Water Upstream and downstream Monthly composite of Gamma Isotopic analysis of each locations. weekly samples (water monthly composite and ice conditions permitting) Tritium analysis of quarterly composites of monthly composites

b. Groundwater Three samples from wells Quarterly Gamma Isotopic and tritium within 5 miles of the MNGP analyses of each sample and one sample from a well greater than 10 miles from the MNGP.

c. Drinking One sample from the City of Composite of 2 weekly I-131 analysis on each bi-weekly Water Minneapolis water supply. samples when I-131 composite when the dose analysis is performed; calculated for the consumption of monthly composite of the water is greater than weekly samples 1 millirem (mrem) per year#.

otherwise. Composite for gross beta and Monthly composite of gamma isotopic analyses weekly samples monthly. Composite for tritium analysis quarterly I-131 Analysis and Gross beta and Gamma isotopic analysis of each monthly composite Tritium analysis of quarterly composites of monthly composites

d. Sediment from One sample upstream of the Semiannually Gamma isotopic analysis of each Shoreline MNGP, one sample sample downstream of the MNGP, and one sample from the shoreline of the recreational area.

Notes:

Italicized text reflects revisions that were made to the ODCM in 2019. Struck out text indicates the previous language that was changed.

1. The dose shall be calculated for the maximum organ and age group, using the methodology and parameters in the ODCM.

• • Sample locations are further described in Table 2.1-5.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Table 2.1-4 below presents the sample frequency and collection, analysis type, and number of samples versus their locations for ingestion pathways.

Table 2.1-4: Monticello Nuclear Generating Plant Radiological Environmental Monitoring Program Sample Collection and Analysis: Ingestion (ODCM 07.01 Table 1)

Sampling and Exposure Pathway Number of Samples and Sample Collection Type and Frequency of and/or Sample Locations** Frequency Analysis

4. Ingestion

a. Milk Samples from milking animals in three Biweekly when Gamma Isotopic and I-131 locations within 3 miles from the animals are on analysis of each sample.

MNGP having the highest dose pasture; monthly potential. If there are none, then one at other times.

sample from milking animals in each of Monthly or three areas between 3 to 5 miles from biweekly if animals the MNGP where doses are calculated are on pasture to be greater than 1 mrem per year.#

One sample from milking animals at a control location, 10 to 20 miles from the MNGP and in the least prevalent wind direction.

One sample from dairy farm having highest D/Q, one sample from each of three dairy farms (if available) calculated to have doses from I-131 >

1 mrem/yr, and one sample from 10-20 miles

b. Vegetation Samples of vegetation grown closest to Monthly during Gamma Isotopic and I-131 each of the two offsite locations of growing season analysis of each sample.

highest predicted annual average D/Q if milk sampling is not performed, and one sample from 10 to 20 miles in the least prevalent wind direction.

c. Fish and One sample of one game species of Samples collected Gamma isotopic analysis on Invertebrates fish located upstream and downstream semi-annually each sample (edible portion of the MNGP. only on fish).

One sample of Invertebrates upstream and downstream of the plant site.

d. Food Products One sample of corn and potatoes from At time of harvest Gamma isotopic analysis of any area that is irrigated by water in edible portion of each which liquid radioactive effluent has sample been discharged.***

Notes:

Italicized text reflects revisions that were made to the ODCM in 2019. Struck out text indicates the previous language that was changed.

• • Sample locations are further described in Table 2.1-5.

• • • As determined by methods outlined in Section 2.3 of the ODCM 07.01.

The dose shall be calculated for the maximum organ and age group, using the methodology and parameters in the ODCM.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Table 2.1-5 below presents the location, code designation, and referenced collection site for a given sample type.

Table 2.1-5: Monticello Nuclear Generating Plant Radiological Environmental Monitoring Program Sample Collection and Analysis (ODCM 07.01 Table 4)

Location Distance Compass Type of Sample Code Collection Site Miles Heading Sector River water M-8c Upstream of plant within 1,000 ft upstream of plant intake River water M-9 Downstream of plant within 1,000 ft downstream of plant discharge Drinking water M-14 City of Minneapolis 37.0 132 SE Groundwater M-43c Imholte Farm 12.3 313 NW Groundwater M-11 City of Monticello 3.3 127 SE Groundwater M-12 Plant Well No. 11 0.26 252 WSW Groundwater M-55 Hasbrouck Residence 1.60 255 WSW Sediment-River M-8c Upstream of plant within 1,000 ft upstream of plant intake Sediment-River M-9 Downstream of plant within 1,000 ft downstream of plant discharge Sediment-Shoreline M-15 Montissippi Park 1.27 114 ESE Fish M-8c Upstream of plant within 1,000 ft upstream of plant intake Fish M-9 Downstream of plant within 1,000 ft downstream of plant discharge Vegetation* M-41 Training Center Near 0.8 151 SSE Vegetation* M-42** Biology Station Road Near 0.7 0.6 136 134 SE M-42A** Near 0.7 108 ESE Vegetation* M-43c Imholte Farm Near 12.3 313 NW Cultivated Crops (corn)*** - -

(potatoes)*** - -

Notes:

Italicized text reflects revisions that were made to the ODCM in 2019. Struck out text indicates the previous language that was changed.

• Actual location for vegetation sampling may vary depending on availability of broad leaf plant species. The nearest available broad leaf specimens to the location should be used.

• • M-42 is the preferred sampling location; however, M-42A may be used in place of M-42, if samples are not available at the preferred location.

• • • Collected only if plant discharges radioactive effluent into the river, then only from river irrigated fields. (See Section 2.1 of the ODCM 07.01) arcadis.com 10

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Table 2.1-5: Monticello Nuclear Generating Plant Radiological Environmental Monitoring Program Sample Collection and Analysis (ODCM 07.01 Table 4) (Continued)

Location Distance Compass Type of Sample Code Collection Site Miles Heading Sector Particulates and Radioiodine (air) M-1c Air Station M-1 11.0 307 NW (air) M-2 Air Station M-2 0.8 140 SE (air) M-3 Air Station M-3 0.6 104 ESE (air) M-4 Air Station M-4 0.8 147 SSE (air) M-5 Air Station M-5 2.6 134 SE Direct Radiation Inner Ring - (general area of the site boundary)

(TLD) M01A Sherburne Ave. So. 0.75 353 N (TLD) M02A Sherburne Ave. So. 0.79 23 NNE (TLD) M03A Sherburne Ave. So. 1.29 56 NE (TLD) M04A Biology Station Rd. 0.5 92 E (TLD) M05A Biology Station Rd. 0.48 122 ESE (TLD) M06A Biology Station Rd. 0.54 138 SE (TLD) M07A Parking Lot H 0.43 0.47 157158 SSE (TLD) M08A Parking Lot F 0.45 175 S (TLD) M09A County Road 75 0.38 206 SSW (TLD) M10A & ISFSI- County Road 75 0.38 224 SW 15 (neutron)

(TLD) M11A County Road 75 0.4 237 WSW (TLD) M12A & ISFSI- County Road 75 0.5 262 W 14 (neutron)

(TLD) M13A North Boundary Rd. 0.89 322 NW (TLD) M14A North Boundary Rd. 0.78 335 NNW Notes:

Italicized text reflects revisions that were made to the ODCM in 2019. Struck out text indicates the previous language that was changed.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Table 2.1-5: Monticello Nuclear Generating Plant Radiological Environmental Monitoring Program Sample Collection and Analysis (ODCM 07.01 Table 4) (Continued)

Location Distance Compass Type of Sample Code Collection Site Miles Heading Sector Direct Radiation Outer Ring - (about 4 to 5 miles distant from the plant)

(TLD) M01B 117th Street 4.65 1 N (TLD) M02B County Road 11 4.4 18 NNE (TLD) M03B County Rd. 73 & 81 4.3 51 NE (TLD) M04B County Rd. 73 (196th Street) 4.2 67 ENE (TLD) M05B City of Big Lake 4.3 89 E (TLD) M06B County Rd 14 &

4.3 117 ESE 196th Street (TLD) M07B Monticello Industrial Dr. 4.3 136 SE (TLD) M08B Residence Hwy 25 &

4.6 162 SSE Davidson Ave (TLD) M09B Weinand Farm 4.7 178 S (TLD) M10B Reisewitz Farm - Acacia Ave 4.2 204 SSW (TLD) M11B Vanlith Farm - 97th Ave 4.0 228 SW (TLD) M12B Lake Maria St. Park 4.2 254 WSW (TLD) M13B Bridgewater Sta. 4.1 270 W (TLD) M14B Anderson Res. - Cty Rd 111 4.3 289 WNW (TLD) M15B Red Oak Wild Bird Farm 4.3 309 NW (TLD) M16B University Ave and Hancock St, Becker Sand Plain 4.4 341 NNW Research Farm Notes:

Italicized text reflects revisions that were made to the ODCM in 2019. Struck out text indicates the previous language that was changed.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Table 2.1-5: Monticello Nuclear Generating Plant Radiological Environmental Monitoring Program Sample Collection and Analysis (ODCM 07.01 Table 4) (Continued)

Location Distance Compass Type of Sample Code Collection Site Miles Heading Sector Direct Radiation - (special interest locations)

(TLD) M01S 127th Street NE Osowski 0.66 241 WSW Fun Market (TLD) M02S & ISFSI- Krone Residence 0.5 220 SW 16 (neutron)

(TLD) M03S Big Oaks Park 1.53 103 ESE (TLD) M04S Pinewood School 2.3 131 SE (TLD) M05S 20500 Co. Rd 11, Big Lake Rivercrest 3.0 118 ESE Christian Academy (TLD) M06S Monticello Public Works 2.6 134 SE (TLD) I-11 & ISFSI-11 OCA Fence South, on 0.31 222 SW (neutron) exit road (TLD) I-12 & ISFSI-12 OCA Fence Middle, on 0.32 230 SW (neutron) exit road (TLD) I-13 & ISFSI-13 OCA Fence North, on 0.34 240 WSW (neutron) exit road Direct Radiation Controls - (10 to 12 miles distant from plant)

(TLD) M01C & Kirchenbauer Farm 11.5 323 NW Neutron Control D

(TLD) M02C & Cty Rd 4 & 15 11.2 47 NE Neutron Control C

(TLD) M03C & Cty Rd 19 & Jason Ave 11.6 130 SE Neutron Control A

(TLD) M04C & Maple Lake Water Tower 10.3 226 SW Neutron Control B

Notes:

Italicized text reflects revisions that were made to the ODCM in 2019. Struck out text indicates the previous language that was changed.

Code letters are defined below:

A = Locations in the general area of the site boundary B = Locations about 4 to 5 miles distant from the MNGP C = Locations of control TLDs greater than 10 miles from the MNGP S = Special interest locations arcadis.com 13

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 2.2 Maps of Sample Locations Figure 2.2-1 below illustrates the sampling locations associated with surface water, well water, air, and vegetation.

Figure 2.2-1: Radiation Environmental Monitoring Program (ODCM 07.01 Figure 1) arcadis.com 14

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Figure 2.2-2 below illustrates the locations of the 4- to 5-mile ring and special interest TLD monitoring stations.

Figure 2.2-2: 4 - 5 Mile Ring and Special Interest TLD Locations (ODCM 07.01 Figure 2) arcadis.com 15

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Figure 2.2-3 below illustrates the locations of site boundary TLD monitoring stations.

Figure 2.2-3: Site Boundary TLD Locations (ODCM 07.01 Figure 3) arcadis.com 16

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Figure 2.2-4 below illustrates the control sample locations, while Figure 2.2-5 illustrates ISFSI TLD locations.

Figure 2.2-4: Control Locations (ODCM 07.01 Figure 4) arcadis.com 17

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Figure 2.2-5: ISFSI TLD Locations (ODCM 07.01 Figure 5) arcadis.com 18

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 3 STATISTICAL AND CALCULATIONAL METHODOLOGY 3.1 Trend Identification One of the purposes of the REMP is not only to determine the levels of radionuclides in the environment associated with MNGPs operations, but what happens to those levels over a period of time. If data trends indicate changes in the concentration of a radionuclide in an environmental medium, it could indicate that reactor operations are causing that particular radionuclide to fluctuate in the environment. Understanding effluent releases from MNGP is necessary to identify and interpret trends (or lack of trends) based on environmental data. Factors that may affect environmental levels of radionuclides include prevailing weather conditions (periods of drought, solar cycles, and extreme precipitation events) and construction activities in close proximity to MNGP of a given sampling location. 8 Some of these factors may be obvious, such as, the increase of airborne particulate beryllium-7 concentration due to atmospheric mixing or increase of surface water tritium due to atmospheric deposition from heavy precipitation events, while others are sometimes unknown.

3.2 Estimation of the Mean Value A widely used statistical calculation was performed on the raw data collected under the sample analysis program. The calculation involved the determining the mean value for the indicator and control samples for each sample medium. The mean value was used in the reduction of the data generated by the sampling and analysis of the various media in the REMP. Net activity (or concentration)" is the activity (or concentration) determined to be present in the sample. No "minimum detectable activity," "lower limit of detection," "less than level," or negative activities or concentrations are included in the calculation of the mean. Equation 1 below was used to calculate the estimated mean. The estimated mean is equal to the sum of all the individual sample values, beginning with the first sample, divided by the total number of samples.

N x = xi i=1 N

(Equation 1)

Where:

x = estimate of the mean i = individual sample N = total number of samples with a net activity (or concentration) xi = net activity (or concentration) for sample i 8

Additionally, from time to time, the trends may be affected by statistical additions or exclusions of known sources of radioactive materials. For instance, there is a measurable amount of radioactivity attributable to the 1986 Chernobyl accident and the 2011 Japan earthquake and tsunami, which triggered the Fukushima Dai-ichi Nuclear Power Plant incident. It is important to note if these factors are being accounted for, as they affect radiological environmental measurements, even though they are not attributable to MNGP.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 3.3 Lower Limit of Detection and Minimum Detectable Activity The lower limit of detection (LLD) and minimum detectable concentration (MDC) are used throughout the REMP and are defined as follows.

LLD is defined in the ODCM as the smallest concentration of radioactive material in a sample that will yield a net count, above the system background, that will be detected with 95 percent probability with only 5 percent probability of falsely concluding that a blank observation represents a real signal. The LLD is an a priori (i.e., before the fact) measurement. The actual LLD is dependent upon the standard deviation of the background-counting rate, the counting efficiency, the sample size (mass or volume),

the radiochemical yield, and the radioactive decay of the sample between sample collection and counting. The required LLDs for each sample medium and selected radionuclides are provided in the ODCM and listed in Table 3.4-2.

MDC is the net counting rate (sample after subtraction of background) that must be surpassed before a sample is considered to contain a scientifically measurable amount of a radioactive material exceeding background amounts. The MDC is calculated using a sample background and may be thought of as an "actual" LLD for a particular sample measurement.

Certain gross counting measurements display a calculated negative value, indicating background is greater than sample activity. In these instances, it does not mean that radioactivity is removed from the environment. Instead, the measurement errors associated with the radiochemical analysis have fluctuated causing the background count rate to be greater than the sample count rate.

3.4 Reporting Levels and Lower Limits of Detection for Radioactivity Reporting levels and lower limits of detection for activity found in environmental samples are listed in Table 3.4-1 and Table 3.4-2. Required REMP sample analyses and their frequencies are listed in Table 3.4-3.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Table 3.4-1: Reporting Levels for Radioactivity Concentration in Environmental Samples Airborne Vegetables Water Fish Milk Analysis Particulate or (pCi/kg, (pCi/L) (pCi/kg, wet) (pCi/L)

Gas (pCi/m3) wet)

Tritium (H-3) 20,000a Manganese-54 (Mn-54) 1,000 30,000 Iron-59 (Fe-59) 400 10,000 Cobalt-58 (Co-58) 1,000 30,000 Cobalt-60 (Co-60) 300 10,000 Zinc-65 (Zn-65) 300 20,000 Zirconium-95 and Niobium-95 400b (Zr-Nb-95)

Iodine-131 (I-131) 2c 0.9 3 100 Cesium-134 (Cs-134) 30 10 1,000 60 1,000 Cesium-137 (Cs-137) 50 20 2,000 70 2,000 Barium-140 and Lanthanum-140 200b 300b (Ba-La-140)

Notes:

a For drinking water samples. This is a 40 CFR Part 141 value. If no drinking water pathway exists, a value of 30,000 pCi/L may be used.

b Total for parent and daughter product.

c If no drinking water pathways exist, a value of 20 pCi/L may be used.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Table 3.4-2: Maximum Values for the Lower Limits of Detection (LLD)

Airborne Fish Food Water Milk Sediment Analysis Particulate or (pCi/kg, Products (pCi/l) (pCi/L) (pCi/kg, dry)

Gas (pCi/m3) wet) (pCi/kg, wet)

Gross beta 4 0.01 Tritium (H-3) 2000a Manganese-54 (Mn-54) 15 130 Iron-59 (Fe-59) 30 260 Cobalt-58 and Cobalt-60 15 130 (Co-58, 60)

Zinc-65 (Zn-65) 30 260 Zirconium-95 and b 15 Niobium-95 (Zr-Nb-95)

Iodine-131 (I-131) 1c 0.07 1 60 Cesium-134 (Cs-134) 15 0.05 130 15 60 150 Cesium-137 (Cs-137) 18 0.06 150 18 80 180 Barium-140 and Lanthanum-140 15b 15b (Ba-La-140)

Notes:

a If no drinking water pathway exists, a value of 3000 pCi/L may be used.

b The specified LLD applies to the daughter nuclide of an equilibrium mixture of the parent and daughter nuclides.

Per the Radiological Assessment Branch Technical Position, the following values may be used for individual nuclide LLDs when equilibrium conditions are not met: 30 pCi/L for Zr-95, 15 pCi/L for Nb-95, 60 pCi/L for Ba-140, and 15 pCi/L for La-140.

c If no drinking water pathway exists, a value of 15 pCi/L may be used.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Table 3.4-3: Analysis and Frequency of Samples Pathway Sample Location Type I-131 Gross Beta Gamma Isotopic Tritium Gamma Dose Airborne Particulate and Radioiodine M-1 Air Station M-1 Control W W Q1 M-2 Air Station M-2 W W Q1 M-3 Air Station M-3 W W Q1 M-4 Air Station M-4 W W Q1 M-5 Air Station M-5 W W Q1 Direct Radiation M01C to M04C Control Q M01A to M14A Q M01B to M16B Q M01S to M06S Q I-11 to 1-13 Q Waterborne: River Water M-8c Upstream of MNGP Control M1 Q1 M-9 Downstream of MNGP M1 Q1 Waterborne: Groundwater M-43c Imholte Farm Control Q Q M-11 City of Monticello Q Q M-12 Plant Well No. 11 Q Q M-55 Hasbrouck Residence Q Q Waterborne: Drinking Water M-14 City of Minneapolis BW1,2 M1 M1 Q1 Waterborne: Sediment M-8c Upstream of Plant Control SA M-9 Downstream of Plant SA M-15 Montissippi Park SA Ingestion: Milk - M/BW3,4 M/BW3,4 Ingestion: Vegetation M-43c Imholte Farm Control M5 M5 M-41 Training Center M5 M5 M-42 Biology Station Road M5 M5 Ingestion: Fish M-8c Upstream of Plant Control SA M-9 Downstream of Plant SA Ingestion: Invertebrates M-8c Upstream of Plant Control SA6 M-9 Downstream of Plant SA6 Ingestion: Food Products - A3 arcadis.com 23

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Notes for Table 3.4-3:

1 Composite of weekly samples.

2 I-131 on each bi-weekly composite when the dose from the consumption of the water is greater than 1 mrem/year. (ODCM Revision 26) 3 This pathway is currently unavailable at MNGP.

4 Every two weeks when animals are on pasture; monthly at other times.

5 During growing season when milk samples are unavailable.

6 This sample was removed as part of ODCM Revision 26.

W = weekly BW = every two weeks M = monthly Q = quarterly SA = semi-annually A = annually arcadis.com 24

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 4 INTERPRETATION OF RESULTS 4.1 Airborne Radioiodine and Particulates The average annual gross beta9 concentrations in airborne particulates were similar at the indicator and control locations (both 0.035 +/- 0.014 pCi/m3 for 2019). These 2019 results are comparable to levels observed from 1999 through 2018. The results are graphed below in Figure 4.1-1.

Figure 4.1-1: Graph of Historical Airborne Particulate Gross Beta Figure 4.1-2 shows the average indictor gross beta from the four indicator locations (Air Station locations M-2, M-3, M-4, M-5) versus the control location (Air Station M-1) in 2019. The error bar represents the statistical uncertainty, as 1.96 sigma (95% confidence), associated with each measurement for a given 9

Gross beta is a measurement of all beta activity present, regardless of specific radionuclide source. Beta particles are physically identical to electrons, but are differentiated by their source (beta particles are created in the nucleus during certain types of nuclear transformations, whereas electrons come from the electron cloud). Beta particles can have various states of energy.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT sample collection date. Despite the variability of gross beta activity in airborne particulates, the average results from the indicator locations were similar to the results from the control location.

Note: the airborne particulate results from December 26, 2018 to January 2, 2019 were reported in the 2018 AREOR.

Figure 4.1-2: Graph of 2019 Average Airborne Particulate Gross Beta for Indicator and Control Locations The upward trend observed in December 2019 is due to increase mixing between the upper and lower atmosphere from atmospheric temperature changes. This mixing relocates suspend particles and beryllium-7, created in the upper atmosphere by cosmic radiation and solar flares, from the upper atmosphere to the lower atmosphere; increasing the airborne particulate gross beta. (Arnold and Al-Salih, 1955) Gamma spectroscopic analysis of quarterly composites of air particulate filters yielded similar results for indicator and control locations. Beryllium-7 was detected in all samples, with an average activity of 0.074 +/- 0.009 pCi/m3 for the indicator and control locations. All other gamma-emitting isotopes were below their respective LLD limits.

The weekly levels of airborne radioiodine-131 were below the LLD for the airborne radioiodine cartridge samples analyzed. There was no indication of an emission of radioiodine from the MNGP.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 4.2 Drinking Water Tritium activity measured below the detection limit for all samples. Gamma isotopic results were all below detection limits. Gross beta was detected in 1 out of 12 samples tested, with a concentration of 2.97 +/-

1.67 pCi/L and was similar to average levels observed from 2009 through 2018. Gross beta averages are shown in Figure 4.2-1. There was no indication of a plant effect.

The required LLD for lanthanum-140 was not met in three of the twelve river water samples in 2019. See Section 7.5 for further details. The remaining gamma isotopic results were all below detection limits.

Figure 4.2-1: Graph of Historical Gross Beta for Drinking Water Sample 4.3 River Water River water was analyzed from samples both upstream and downstream of MNGP. Tritium activity measured below the detection limit for all samples. The required LLD for lanthanum-140 was not met in five of the twenty river water samples in 2019. See Section 7.5 for further details. The remaining gamma isotopic results were all below detection limits.

4.4 Groundwater Tritium, gamma isotopic, and iodine-131 were below the detection limit for all samples taken. The data for 2019 was consistent with the previous years results and no plant operational effects were indicated.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 4.5 Broadleaf Vegetation Vegetation samples were collected during the growing season of July, August and September 2019.

Iodine-131 concentrations measured below the detection limit in all samples. These samples are required when milk samples are not available.

4.6 Food Products Corn and potato samples were not required for 2019. There were no crops, within five miles of the plant, using irrigation water from the Mississippi River, and the plant did not discharge radioactive liquid effluents.

4.7 Fish Eight fish were analyzed in 2019, consisting of two fish collected from upstream locations and two collected from downstream locations in May and then again in September. Two species of fish, shorthead redhorse and smallmouth bass, were collected from each location. Gamma spectroscopy was performed on the edible portion of the fish. Only naturally occurring potassium-40 was found with an average of 3.32

+/- 0.24 pCi/g wet weight for four upstream samples and 3.01 +/- 0.26 picocuries per gram (pCi/g) wet weight for the four downstream samples. These results are consistent with historical results. Other gamma-emitting isotopes remained below detection limits. There were no gamma emitting radionuclides attributable to plant operations identified in any of the 2019 fish samples.

4.8 Aquatic Invertebrates Invertebrates (crayfish) were collected in July 2019 at the control and indicator locations.

Revision 26 of ODCM 07.01 removed invertebrate sample collection and analysis.

Thus, only one sample collection was performed during 2019. There were no gamma emitting radionuclides attributable to plant operations identified in any of the 2019 aquatic invertebrate samples.

Photo Credit: Darin Jensen, Senior Design Engineer, MNGP Canada Goose and Goslings Crossing Near an MNGP Radiological Environmental Sampling Point arcadis.com 28

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 4.9 Shoreline Sediment Upstream, downstream and downstream recreational area shoreline sediment collections were made in June and October 2019 and analyzed for gamma-emitting isotopes. Cesium-137 was detected in October at the downstream samples (M-9), with a concentration of 0.120 +/- 0.049 pCi/g dry weight. Similar levels of activity have been observed since 1996 (see Figure 4.9-1) and are indicative of the influence of fallout deposition from above ground nuclear weapons testing. Levels of Cs-137 in sediments are observed to fluctuate as silt distributions shift due to natural erosion and transport processes. Naturally occurring beryllium-7 and potassium-40 were also detected. There was no indication of a plant effect.

Figure 4.9-1: Graph of Historical Cs-137 in River Sediment arcadis.com 29

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 4.10 Direct Gamma Radiation 4.10.1 Environmental TLD Ambient radiation was measured in the general area of the site boundary, inner ring, at an outer ring 4 to 5 miles (mi) from the plant, at special interest areas and at four control locations. The means were similar for both inner and outer rings (13.8 and 13.7 millirem (mrem/91 days), respectively. The mean for special interest locations was 13.8 mrem/91 days and the mean for the control locations was 13.1 mrem/91 days.

Figure 4.10.1-1 shows the average measured dose from each standard (std) quarter. The error bars represent the statistical uncertainty associated with each average measurement.

Figure 4.10.1-1: Graph of Direct Gamma Radiation Measurements Dose rates measured at the inner and outer ring locations were similar to those observed from 1999 through 2018 and are shown in Figure 4.10.1-2. No plant effect on ambient gamma radiation is indicated.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Figure 4.10.1-2: Graph of Historical Direct Gamma Measurements arcadis.com 31

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 4.10.2 ISFSI TLD Gamma and Neutron TLDs are located around the Independent Spent Fuel Storage Installation (ISFSI) to monitor direct radiation from stored fuel for trending purposes. The ISFSI TLDs are not considered true REMP TLDs and are not representative of the dose to members of the public. Results for monitoring are included in Section 10.

No additional spent fuel casks were moved to the ISFSI during 2019. Review of the ISFSI TLD data indicates that in some cases TLDs at positions I-04 and I-10 showed higher uncertainty than at the other ISFSI locations. The increased uncertainty is driven by what appear to be statistically significant differences between the readings for the two TLD badges located at each location. In these cases, all data was still included in the averages in order to provide consistent data treatment. Annual data trends at the ISFSI are consistent with what is expected, based on the amount of spent fuel in the installation.

During 2019, the average quarterly gamma dose rate for locations I-01 through I-10 was 50 +/- 23 mrem/quarter. There were no detectable dose rate increases observed at the site boundary TLDs during 2019 (See Figures 4.10.1-2, and 4.10.1-1, Table 8.1-1).

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 5 LAND USE CENSUS 5.1 Purpose The Land Use Census identifies the pathways (or routes) by which radioactive material may reach the general populations near commercial nuclear generating stations. This is accomplished by completing studies each year that identify how the surrounding lands are used by the population. A comprehensive census of the use of the land within a five-mile distance of the plant is completed during the growing season each year. This information is used for dose assessment and to identify changes to the stations sampled and the type of samples. Therefore, the purpose of the Land Use Census is to ensure the REMP is current based on human activity near MNGP, as well as provide data for the calculation of estimated radiation exposure.

Photo Credit: Darin Jensen, Senior Design Engineer, MNGP Woodchuck Near an MNGP Radiological Environmental Sampling Point.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT The pathways evaluated are:

Ingestion Pathway - Results from eating food crops that may have radioactive materials deposited on them or incorporated radioactive materials from the soil or atmosphere. Another potential pathway is through drinking milk or eating cheese from local cows or goats. The vegetation used to feed these animals may include radioactive material due to deposition or uptake from soil and the radioactivity transferred to the milk. If milk animals are not present, vegetation is collected in lieu of milk.

Direct Radiation Exposure Pathway- Results from deposition of radioactive materials on the ground or from passage of these radioactive materials in the air.

Inhalation Pathway- Results from breathing radioactive materials transported in the air.

5.2 Methodology The following must be identified within the five-mile radius of the plant for each of the sixteen meteorological sectors (compass direction the winds may blow, for example NNE [North-Northeast]):

The nearest resident The nearest garden of greater than 500 square feet (ft2), producing broadleaf vegetables The nearest meat animal The nearest milk animal In addition, all milk animals, meat animals, and gardens greater than 500 ft 2 within three miles of the site are located.

The primary methods are visual inspection from the roadside within the 5-mile radius, inputs from field data forms, Google Earth Pro satellite imagery, and Homeland Security Emergency Management Monticello base map.

5.3 2019 Land Use Census The 2019 Land Use Census was conducted between August 26 and September 20, 2019, by the REMP Coordinator in accordance with MNGPs Chemistry Manual, Procedure I.05.41, Annual Land Use Census and Critical Receptor Identification. The survey was performed in order to identify the nearest residence, milk animals, meat animals, and gardens of greater than 500 ft 2 with broadleaf vegetables, in each of the sixteen meteorological sectors within a five-mile radius. In addition, all milk animals, meat animals and all gardens of 500 ft2 or greater with broadleaf vegetables within a three mile radius of the plant were located. Distance, direction and dose pathway information is used to determine if any sampling locations need to be changed in the REMP sampling program and for determining Critical Receptor data.

The 2019 survey was performed using door-to-door surveys and visual observations while driving; additionally, inputs from the 2018 field data forms were used to evaluate changes to the land use. Google Earth Pro satellite imagery and Homeland Security Emergency Management Monticello Basemap were used in determining changes in land use. Data was collected using a combination of the Spyglass App and in Google Earth Pro, using a universal serial bus (USB) global positioning system (GPS) receiver.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Google Earth Pro was used to determine receptor location distances and sectors; these results were used in determining dispersion parameters for dose calculations.

The nearest garden in one sector had an increase in deposition coefficient (D/Q) of greater than 20 percent, from compared to 2018; from South-Southwest sector went from 2.10 miles from the site (2018) to 1.63 miles from the site (2019). The highest D/Q garden for 2019 remains in sector SSE at 1.20 miles from the plant.

There was one sector where the highest D/Q value for meat increased by greater than 20 percent. The highest D/Q meat location is in the West-Southwest sector, 1.78 miles from the plant. The highest D/Q combined Meat/Garden location is in the West Sector, 1.82 miles from the plant.

There were no sectors in which the highest D/Q values for the nearest residence increased by more than 20 percent in 2019. The highest D/Q residence remains at 0.99 miles from the plant in the South-Southeast sector.

One milk animal was identified within five miles radius of the site. The new Photo Credit: Gene Richter, Operator, Special Projects, MNGP milk location is located 3.25 miles in the North-Northeast sector. Due to Deer Near an MNGP Radiological Environmental Sampling Point. the relativity low deposition, the calculated dose at this location is lower than the vegetation sample locations. Milk samples are required for three locations within 3 miles or three locations where doses are calculated to be greater than 1 mrem/year (ODCM 07.01). The identified milk animal is greater than 3 miles from the site and the dose from all pathways at that location is 0.046 mrem/year. Thus, vegetation sampling was performed in lieu of milk sampling.

There are no crops being irrigated from the Mississippi River within five miles downstream of the plant, based upon the most recent Water Use Resources Permit Index Report from the Minnesota Department of Natural Resources. The nearest downstream drinking water supplies, drawn from the Mississippi River, remain St. Paul and Minneapolis water supplies as currently documented in the ODCM and UFSAR.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Table 5.3-1 summarizes the locations showing >20% increase in D/Q as identified in the Land Use Census from 2018 to 2019. The identified locations in Table 5.3-1 do not necessarily represent the highest D/Q locations for a pathway (i.e. garden, meat, milk) but are > 20% increase in the D/Q of a pathway within a specific sector . The highest D/Q location for each pathway is described in Table 5.3-2.

Table 5.3-1: Changes in Land Use Census from 2018 to 2019 2018 2019 Sector Pathway Distance Distance 2018 D/Q 2019 D/Q (mi) (mi)

SSW Garden 2.10 1.63 7.0E-10 1.2E-09 SSW Meat 4.53 2.77 1.5E-10 4.1E-10 NNE Milk - 3.25 - 3.90E-10 Table 5.3-2: Summary of Highest Location for each pathway in 2019 Pathway Sector Distance (mi) D/Q Residence SSE 0.99 1.40E-08 Meat WSW 1.78 9.60E-10 Meat + Garden W 1.82 6.90E-10 Garden SSE 1.20 6.70E-09 Milk1,2 NNE 3.25 3.90E-10 Crops - - -

Notes:

1 Represents a change from 2018 2

Vegetation performed in lieu of milk sampling Doses due to ground plane, inhalation, and ingestion of vegetables and meat, were calculated for the highest D/Q Residence, Meat Animal, Vegetable Garden, and combined Vegetable/Meat locations identified in the 2019 Land Use Census. In accordance with the ODCM, the long- and short-duration gaseous releases from the Reactor Building Vent and the Off-gas Stack for the previous calendar year were used as the source terms.

Doses were calculated using the RADEAS computer program with the 2018 Annual Effluent Data report source term as input. This resulted in identifying the same Sector, Distance, and Pathway, as compared to last year's Critical Receptor. The location is a residence with a garden located 1.20 miles away in the SSE sector (designated GH) and the pathway identified is the combination of ground plane, inhalation, and vegetable ingestion, to the thyroid of the child age group. The critical receptor, for purposes of compliance with 10CFR50 Appendix I for this period, is defined as follows: SSE Sector at a distance of 1.20 miles considering ground plane, inhalation, and vegetable exposure pathways to the thyroid of a child with a dose of 7.50E-02 mrem/year.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 6 QUALITY ASSURANCE 6.1 Sample Collection MNGP personnel performed the environmental sample collections as specified by approved sample collection procedures.

6.2 Sample Analysis General Engineering Laboratories (GEL), LLC performed the environmental sample analyses as specified by approved analysis procedures. GEL is located in Charleston, South Carolina.

6.3 Dosimetry Analysis Environmental Dosimetry Company (EDC) works in conjunction with Stanford Dosimetry to perform the environmental dosimetry measurements as specified by approved dosimetry analysis procedures. The Environmental TLD program at the EDC provides Panasonic TLD badges containing calcium sulfate (CaSO4) phosphor elements for posting in the field. The raw TLD results are corrected for individual element sensitivity and reader sensitivity as determined by the quality control results. Control dosimeters are used to determine the background radiation exposure during the shipment and serve to evaluate transit exposures. The transit exposures are subtracted from the field dosimeters. Since the measured signal fades from time of exposure to analysis the fade of the thermoluminescent response is compensated.

6.4 Laboratory Equipment Quality Assurance 6.4.1 Daily Quality Control GEL has an internal quality assurance program which monitors each type of instrumentation for reliability and accuracy. Daily quality control checks ensure that instruments are in proper working order and these checks are used to monitor instrument performance.

6.4.2 Calibration Verification National Institute of Standards and Technology (NIST) standards that represent counting geometries are analyzed as unknowns at various frequencies, ranging from weekly to annually, to verify that efficiency calibrations are valid. The frequency is dependent upon instrument use and performance. Investigations are performed and documented should calibration verification data fall outside of the acceptable limits.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 6.5 General Engineering Laboratory, LLC (GEL)

GEL participated in various Quality Assurance Programs for Inter-laboratory, Intra-laboratory, Third Party Cross Check programs, and a number of proficiency testing programs during 2019. A summary of the GEL quality assurance program results for the sample media types sent to GEL during 2019 is documented in Appendix A.

6.6 Environmental Dosimetry Company Environmental Dosimetry Company participates in an internal performance acceptance criteria and a quarterly independent testing TLD intercomparison program. In 2019, 100 percent of the individual dosimeters passed the performance criteria. A summary of the 2019 Environmental Dosimetry Company Annual Quality Assurance Status Report is documented in Appendix B.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 7 ENVIRONMENTAL SAMPLING MODIFICATIONS 7.1 Program Modifications ODCM-07.01 Revision 26 was issued December 12, 2019. This revision included the following changes to the REMP:

Added new broadleaf vegetation sample location M-42A to supplement location M-42. Previous location M-42 did not produce enough quantity and species for sample.

Revised drinking water I-131 analysis to be required when the dose from the consumption of the water is greater than 1 mrem/year. NUREG 1302 specifies a composite sample over a 2-week period when I-131 analysis is performed and monthly composite otherwise. Also, I-131 analysis is required only when the dose calculated for consumption of the water is greater than 1 mrem/year. This change is consistent with NUREG-1302 and historical grab sampling practices at MNGP.

The equilibrium pairs listed in ODCM 07.01 Table 3 (Zr-Nb-95 and Ba-La-140) will establish full equilibrium following approximately 7 daughter half-lives. In the event that a sample is counted when equilibrium has not been established, then the guidance from the NRC's "Radiological Assessment Branch Technical Position, Rev. 1, on Radiological Monitoring" (referred to as the BTP) was used for guidance on what LLD should be used for the parent isotope (which is harder to detect in both cases).

The BTP was the original NRC guidance for REMP that was eventually adapted into NUREG-1302 and remains a valid basis document for LLDs.

Removed the requirement to sample invertebrates. NUREG-1302 specifies 'One sample of each commercially and recreationally important species in vicinity of plant discharge area. Aquatic invertebrate species near Monticello include freshwater clams and mussels, and crayfish. None of these species are commercially or recreationally important in the area. Further, freshwater mussels are protected, and several endangered mussel species are present in the Mississippi River, making it problematic to harvest these organisms when they are found. These invertebrate samples do not provide useful data for monitoring public dose and were removed from the program, consistent with NUREG-1302.

7.2 Change of Sampling Procedures There were no changes to sampling procedures in 2019.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 7.3 Change of Analysis Procedures In 2018, samples were analyzed by Environmental, Inc. Midwest Laboratory. In 2019, the samples were analyzed by GEL Laboratory, Charleston, South Carolina. While the laboratory change did not impact the required LLDs, the actual MDC of some analyses, such as tritium and gross beta, could be different between the two laboratories due to variations between laboratory background and analytical equipment.

This may cause positive detection of radioactivity in instances when the MDC is lower at GEL than Environmental, Inc or no detection when then MDC was higher at GEL than Environmental, Inc. This may result is a slight skewing of the long term annual average trends due to the number of positive detections from one laboratory to another.

The standard operating procedures used by GEL are approved methods. Copies of GELs accreditations and certifications are available on their website, www.gel.com.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 7.4 Sample Deviations and Unavailable Analysis Table 7.4-1 lists the deviations from the required REMP sample collection in 2019. Despite these sample deviations, the intent of the program was satisfied as 98.9 percent of the required samples were obtained.

Table 7.4-1: Sample Deviations and Unavailable Analysis Reason for not Sample Collection conducting Corrective Condition Analysis Location Type Date or Period REMP as Action Report required Gamma Composite - Unsafe Isotopic Gamma: Jan, condition for Sample Surface M-8C Feb, Mar 2019 sampling due to obtained when 501000021813 Water Tritium and Tritium: 1st river surface water thawed quarter being frozen Quarter 1 (Jan TLD was Relocted to a Direct TLD M-15B through Mar missing in the pole across the 501000025016 Radiation 2019) field road Gamma Air sampler Restored Isotopic power loss -

Air Power to May 8 - 14, sample Particulate & Gross Beta M-5 station, sample 501000027446 2019 collected 47.9 of Air Cartridge collected and

~192 hour Radioiodine analyzed period Quarter 2 (Apr TLD was Direct TLD M-12B through Jun missing in the Replaced TLD 501000029403 Radiation 2019) field TLD was Quarter 2 (Apr Direct damaged by TLD M-02C through Jun Replaced TLD 501000029403 Radiation lawn mowing 2019) equipment Gamma Air sampler Restored Isotopic power loss -

Air Power to Aug 8 - 14, sample Particulate & Gross Beta M-2 station, sample 501000030820 2019 collected 113.6 Air Cartridge collected and of ~192 hour Radioiodine analyzed period ODCM Revision Sample 26 deleted Gamma M-8 & requirement Invertebrate Quarter 3 semi-annual 616000000020 Isotopic M-9 removed from sample program requirement Composite- Unsafe Gamma Gamma: Nov 7 condition for Sample Surface Isotopic M-8C - 30, Dec 2019 sampling due to obtained when 501000021813 Water Tritium: Nov 7 - river surface water thawed Tritium Dec 31, 2019 being frozen Quarter 4 2019 TLD was Direct TLD M-02A (Oct through missing in the Replaced TLD 501000036267 Radiation Dec 2019) field Quarter 4 2019 Direct TLD post TLD M-16B (Oct through Relocated Pole 501000032318 Radiation leaning Dec 2019) arcadis.com 41

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 7.5 Analytical Deviations The LLD is the smallest concentration of radioactive material in a sample that will be detected with 95 percent probability with 5 percent probability of falsely concluding that a blank observation represents a real signal. The LLD is established a priori, before sample analysis, and is a statement of the expected capability of the analysis. The MDC measured a posteriori, after the fact, is the actual performance of the analytical measurement and is based upon the actual sample background count rate, sample hold time, and sample volume. The ODCM 07.01 Table 3 LLD for the parent-daughter isotopic pair Barium-140/Lathanum-140 is 15 pCi/L. (see Table 3.4-2) Of the 46 groundwater, surface water, and drinking water samples performed in 2019, the lower limit of detection of 15 pCi/L was not satisfied in eight of the Barium-140/Lanthanum-140 samples (17%). In each sample, the a posteriori MDC was higher than the ODCM Table 3 LLD.

The cause of the deviation was largely due to the time period between sample analysis and sample collection. Shipping delays, laboratory closure due to Hurricane Dorian, and short radiochemical half-life caused the deviations. The average number of days between sample collection and analysis for the 46 water samples was 23 days. Since Barium-140 and Lathanum-140 half-lives are 12.75 days and 1.68 days, respectively, 30 days beyond the sample collect and analysis challenges the laboratorys ability to meet the required lower limit of detection. See Table 7.5-1 for more details.

Table 7.5-1: Analytical Deviations for Lanthanum-140 ODCM 07.01 Minimum Detectible Collect Analysis Result Table 3 Concentration Location Cause Date/Time Date/Time (pCi/L) Required (MDC)

LLD (pCi/L) (pCi/L)

M-14 City of 4/24/2019 6/5/2019 -8.15 15 16.50 A Minneapolis 6:00 11:56 M-8 Upstream of 4/24/2019 6/5/2019 -1.95 15 15.60 A plant 8:25 11:56 M-9 Downstream 4/24/2019 6/5/2019 -2.99 15 15.80 A of plant 8:40 11:56 M-14 City of 8/27/2019 10/15/2019 4.00 15 20.20 B Minneapolis 14:00 12:41 M-8 Upstream of 8/28/2019 10/15/2019 1.40 15 24.30 B plant 8:20 12:41 M-9 Downstream 8/28/2019 10/15/2019 -11.7 15 20.80 B of plant 8:30 12:41 M-8 Upstream of 11/6/2019 12/30/2019 -2.01 15 28.10 C plant 8:30 14:11 M-14 City of 11/26/2019 12/30/2019 -13.8 15 26.80 D Minneapolis 6:00 14:10 Cause Codes:

A= Shipping delayed sample receipt to laboratory.

B= Hurricane Dorian flooding closed laboratory.

C= Sample Exceeded hold time due to sample unavailability after November 6, 2019.

D= High statistical error associated with analysis.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 8 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM -

SUMMARY

OF RESULTS This section presents a summary of MNGPs REMP sampling and monitoring results for the 2019 period for airborne particulates, airborne radioiodine, direct radiation, and measurable radioactivity in milk, broadleaf vegetation, river water, aquatic invertebrates, shoreline sediments, groundwater, drinking water, and fish. In all, there were no reported non-routine measurements.

8.1 Radiological Environmental Monitoring Program Data Summary Table 8.1-1 below presents the summary of MNGPs REMP sampling and monitoring results for the 2019 period.

Notes from Table 8.1-1:

1 Mean and range are based upon detectible measurements only.

2 (f) Fraction of detectible measurements at a specific location 3 Natural and not due to plant influence 4 The specified LLD applies to the daughter nuclide of an equilibrium mixture of the parent and daughter nuclides. Per the Radiological Assessment Branch Technical Position, the following values may be used for individual nuclide LLDs when equilibrium conditions are not met: 30 pCi/L for Zr-95, 15 pCi/L for Nb-95, 60 pCi/L for Ba-140, and 15 pCi/L for La-140.

5 If no drinking water pathway exists, a value of 15 pCi/L may be used.

6 Positive Ba-140 results were due to analytical deviations rather than actual detection of plant related material. La-140 was not detected in any of the water samples. In some cases, the required LLD was not met for Ba-La-140. See Section 7.5 for further details.

7 Not required arcadis.com 43

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Table 8.1-1: Radiological Environmental Monitoring Program Summary Name of Facility: Monticello Nuclear Generating Plant Docket No: 50-263 Location of Facility: Wright, Minnesota Reporting Period January - December 2019 Type, Control Location with Highest Annual Mean1 (f)2 Total Mean Number of ODCM Indicator Mean1; Analyses Table 3 Number of Medium or Pathway Sampled performed Lower Name Mean 1 Nonroutine (Units) Limit of Reported Detection Range1 Measurements (f)2 (f)2 (e.g. I-131, (LLD) Distance and 400) 1 Direction Range Range1 Airborne Particulates Gross Beta 0.01 0.035 (204/204) M-4, Air Station 0.035 (51/51) 0.035 (51/51) 0 (pCi/m3) (255) 0.013 - 0.11 0.8 mi @ 147/SSE 0.016 - 0.11 0.012 - 0.088 Gamma 0 (20)

Be-7 3 - 0.074 (16/16) M-3, Air Station 0.077 (4/4) 0.074 (4/4) 0.048 - 0.098 0.6 m @ 104/ESE 0.048 - 0.098 0.054 - 0.097 Mn-54 - <LLD - - <LLD Co-58 - <LLD - - <LLD Co-60 - <LLD - - <LLD Zn-65 - <LLD - - <LLD Zr-Nb-95 - <LLD - - <LLD Ru-103 - <LLD - - <LLD Ru-106 - <LLD - - <LLD Cs-134 0.05 <LLD - - <LLD Cs-137 0.06 <LLD - - <LLD Ba-La-140 - <LLD - - <LLD Ce-141 - <LLD - - <LLD Ce-144 - <LLD - - <LLD Airborne Radioiodine I-131 0.07 <LLD - - <LLD 0 (pCi/m3) (255)

Broadleaf Vegetation Gamma 0 (pCi/kg-wet) (9)

Mn-54 - <LLD - - <LLD Fe-59 - <LLD - - <LLD Co-58 - <LLD - - <LLD Co-60 - <LLD - - <LLD Zn-65 - <LLD - - <LLD Zr-Nb-95 - <LLD - - <LLD I-131 60 <LLD - - <LLD Cs-134 60 <LLD - - <LLD Cs-137 80 <LLD - - <LLD Milk I-131 1 N/A N/A N/A N/A 0 (pCi/L) (0)

Gamma N/A N/A N/A N/A N/A 0 (0) arcadis.com 44

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Type, Control Location with Highest Annual Mean1 (f)2 Total Mean Number of ODCM Indicator Mean1; Analyses Table 3 Number of Medium or Pathway Sampled performed Lower Name Mean1 Nonroutine (Units) Limit of Reported Detection Range1 Measurements (f)2 (f)2 (e.g. I-131, (LLD) Distance and 400) Direction Range1 Range1 Aquatic Invertebrates Gamma 0 (pCi/kg-wet) (2)

K-403 - <LLD - - <LLD Mn-54 130 <LLD - - <LLD Fe-59 260 <LLD - - <LLD Co-58 130 <LLD - - <LLD Co-60 130 <LLD - - <LLD Zn-65 260 <LLD - - <LLD Zr-Nb-95 - <LLD - - <LLD Cs-134 130 <LLD - - <LLD Cs-137 150 <LLD - - <LLD Ba-La-140 - <LLD - - <LLD Ce-144 - <LLD - - <LLD Fish Gamma 0 (pCi/kg-wet) (8)

K-403 - 3010 (4/4) M-9 Downstream 3010 (4/4) 3320 (4/4) 2730 - 3290 of plant 2730 - 3290 3020 - 3600 Mn-54 130 <LLD - - <LLD Fe-59 260 <LLD - - <LLD Co-58 130 <LLD - - <LLD Co-60 130 <LLD - - <LLD Zn-65 260 <LLD - - <LLD Zr-Nb-95 - <LLD - - <LLD Cs-134 130 <LLD - - <LLD Cs-137 150 <LLD - - <LLD Ba-La-140 - <LLD - - <LLD Ce-144 - <LLD - - <LLD Shoreline Sediments Gamma 0 (pCi/kg-dry) (6)

Be-73 - 1040 (1/4) M-9, Downstream 1040 (1/2) <LLD 1040 - 1040 of plant 1040 - 1040 K-403 - 15800 (4/4) M-15 17900 (2/2) 11850 (2/2) 12700-23100 Montissippi Park 12700-23100 11800-11900 Mn-54 - <LLD - - <LLD Fe-59 - <LLD - - <LLD Co-58 - <LLD - - <LLD Co-60 - <LLD - - <LLD Zn-65 - <LLD - - <LLD Zr-Nb-95 - <LLD - - <LLD Cs-134 150 <LLD - - <LLD Cs-137 180 120 (1/4) M-9, Downstream 120 (1/2) <LLD 120 - 120 of plant 120 - 120 Ba-La-140 - <LLD - - <LLD Ce-144 - <LLD - - <LLD arcadis.com 45

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Type, Control Location with Highest Annual Mean1 (f)2 Total Mean Number of ODCM Indicator Mean1; Analyses Table 3 Number of Medium or Pathway Sampled performed Lower Name Mean1 Nonroutine (Units) Limit of Reported Detection Range1 Measurements (f)2 (f)2 (e.g. I-131, (LLD) Distance and 400) Direction Range1 Range1 Drinking Water Gross Beta 4 2.97 (1/12) M-14 City of 2.97 (1/12) None 0 (pCi/L) (12) 2.97 - 2.97 Minneapolis 2.97 - 2.97 Gamma 0 (12)

Mn-54 15 <LLD - - None Fe-59 30 <LLD - - None Co-58 15 <LLD - - None Co-60 15 <LLD - - None Zn-65 30 <LLD - - None Zr-Nb-95 154 <LLD - - None Cs-134 15 <LLD - - None Cs-137 18 <LLD - - None Ba-La-140 154 <LLD 6 - <LLD 6 None Ce-144 - <LLD - - None I-131 1 <LLD - - None 0 (51)

Tritium 2000 <LLD - - None 0 (4)

Groundwater Gamma 0 (pCi/L) (16)

Mn-54 15 <LLD - - <LLD Fe-59 30 <LLD - - <LLD Co-58 15 <LLD - - <LLD Co-60 15 <LLD - - <LLD Zn-65 30 <LLD - - <LLD Zr-Nb-95 154 <LLD - - <LLD Cs-134 15 <LLD - - <LLD Cs-137 18 <LLD - - <LLD Ba-La-140 154 <LLD - - <LLD Ce-144 - <LLD - - <LLD I-1317 15 <LLD - - <LLD 0 (4)

Tritium 2000 <LLD - - <LLD 0 (16)

River Water Gamma 0 (pCi/L) (20)

Mn-54 15 <LLD - <LLD <LLD Fe-59 30 <LLD - <LLD <LLD Co-58 15 <LLD - <LLD <LLD Co-60 15 <LLD - <LLD <LLD Zn-65 30 <LLD - <LLD <LLD Zr-Nb-95 154 <LLD - <LLD <LLD Cs-134 15 <LLD - <LLD <LLD Cs-137 18 <LLD - <LLD <LLD Ba-La-140 154 <LLD 6 - <LLD 6 <LLD 6 Ce-144 - <LLD - <LLD <LLD Tritium 2000 <LLD - - <LLD 0 (7) arcadis.com 46

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Type, Control Location with Highest Annual Mean1 (f)2 Total Mean Number of ODCM Indicator Mean1; Analyses Table 3 Number of Medium or Pathway Sampled performed Lower Name Mean1 Nonroutine (Units) Limit of Reported Detection Range1 Measurements (f)2 (f)2 (e.g. I-131, (LLD) Distance and 400) Direction Range1 Range1 Direct Radiation: Gamma - N/A M03C 13.7 (4/4) 13.1 (15/15) 0 Control (15) 11.6 mi @ (12.9-14.9) (11.8 - 14.9) 130/SE (10 to 12 miles distant)

(mrem/91 days)

Direct Radiation: Gamma - 13.8 (55/55) M11A, 14.6 (4/4) 0 Inner Ring (55) (11.7- 16.1) 0.4 mi @ (13.8 -15.9) 237/WSW (General Area at Site Boundary)

(mrem/91 days)

Direct Radiation: Gamma - 13.7 (62/62) M14B, 15.5 (4/4) 0 Outer Ring (62) (10.3 - 16.0) 4.3 mi @ (14.3 - 16.0) 289/WNW (4-5 mi. distant)

(mrem/91 days)

Direct Radiation: Gamma - 13.8 (36/36) M06S, 14.8 (4/4) 0 Special Interest Areas (36) (10.6 - 15.9) 2.6 mi @134/SE (13.8 - 15.9)

(mrem/91 days) arcadis.com 47

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 9 ERRATA TO PREVIOUS REPORTS 9.1 Errata to the MNGP AREOR There are no errata for previous reports from 2019.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 10 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM RESULTS Data below was analyzed by GEL Laboratories, LLC (GEL). The results reported relate only to the items tested and to the sample as received by the laboratory. Copies of GELs accreditations and certificates can be found at www.gel.com.

Notes:

1. LLDs are a priori values.

2. MDCs are calculated a posteriori value.

3. Gamma spectroscopy analysis results are calculated from a measurement using only one gamma energy line.

4. Results with either no qualifier, an M, or an L are considered positive results. While a U, UI, or ND are negative.

Matrix Abbreviations AC Airborne Cartridge AP Airborne Particulate SE Sediment TA Aquatic Tissue TP Plant Tissue WG Groundwater WP Drinking Water WS Surface Water Qualifiers L Analyte present. Reported value may be biased low. Actual value is expected to be higher M M if above MDC and less than LLD M REMP Result >MDC/CL and <RDL ND Analyte concentration is not detected above the limits as defined as the U qualifier U Analyte was analyzed for, but not detected above the MDL, MDA, MDC, or LOD UI Gamma Spectroscopy - uncertain identification; these results were evaluated and found to be false positives, unless otherwise noted X Lab specific qualifier - see notes from data tables for details.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT 10.1 Detection of activity It is often not possible to say for certain when net radioactivity is present in samples at environmental background levels due to natural variations in counting instrument backgrounds and other factors. The data below is reported as determined by the lab with uncertainties and all data has been included (even results with negative numbers). Results with U, UI, or ND qualifiers are considered not detected and results with L, M, or blank qualifiers are considered to be detected.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT AIRBORNE CARTRIDGE: RADIOIODINE Sample Date Air Station M-1 Air Station M-2 Air Station M-3 Air Station M-4 Air Station M-5 (pCi/m3) (pCi/m3) (pCi/m3) (pCi/m3) (pCi/m3) 1/9/2019 2.15E-03 +/- 6.44E-03 -1.56E-03 +/- 6.56E-03 -5.85E-04 +/- 5.87E-03 -1.85E-04 +/- 5.40E-03 -6.60E-04 +/- 7.79E-03 U U U U U 1/16/2019 4.83E-03 +/- 1.10E-02 4.61E-03 +/- 9.36E-03 9.66E-03 +/- 1.10E-02 5.74E-03 +/- 1.28E-02 -9.31E-03 +/- 1.34E-02 U U U U U 1/23/2019 -3.89E-03 +/- 1.25E-02 3.00E-03 +/- 1.04E-02 2.59E-03 +/- 1.02E-02 1.24E-02 +/- 1.58E-02 7.51E-03 +/- 1.18E-02 U U U U U 1/31/2019 1.00E-03 +/- 6.77E-03 -1.14E-03 +/- 4.71E-03 -2.77E-03 +/- 6.32E-03 2.01E-03 +/- 6.68E-03 8.17E-04 +/- 5.91E-03 U U U U U 2/6/2019 4.45E-03 +/- 1.03E-02 -1.39E-03 +/- 9.27E-03 -3.79E-03 +/- 1.00E-02 1.26E-03 +/- 6.66E-03 4.99E-03 +/- 8.35E-03 U U U U U 2/13/2019 -7.76E-03 +/- 9.63E-03 -2.02E-03 +/- 1.11E-02 5.42E-04 +/- 1.99E-02 2.12E-03 +/- 1.43E-02 3.38E-03 +/- 1.12E-02 U U U U U 2/20/2019 -1.86E-03 +/- 5.43E-03 7.55E-03 +/- 8.39E-03 -4.46E-04 +/- 5.75E-03 -6.28E-04 +/- 5.95E-03 4.73E-04 +/- 7.71E-03 U UI U U U 2/27/2019 -9.20E-03 +/- 1.29E-02 -8.06E-03 +/- 1.58E-02 -2.53E-03 +/- 1.24E-02 -6.06E-03 +/- 1.47E-02 -4.52E-03 +/- 1.15E-02 U U U U U 3/6/2019 4.66E-03 +/- 7.36E-03 5.86E-03 +/- 5.75E-03 3.45E-03 +/- 6.41E-03 -1.31E-03 +/- 6.10E-03 2.35E-03 +/- 6.18E-03 U U U U U 3/13/2019 -6.84E-03 +/- 6.26E-03 7.91E-04 +/- 7.36E-03 -1.35E-03 +/- 1.01E-02 4.32E-03 +/- 9.69E-03 1.22E-03 +/- 9.19E-03 U U U U U 3/20/2019 5.07E-03 +/- 5.31E-03 -1.06E-03 +/- 6.12E-03 5.42E-04 +/- 5.82E-03 -2.71E-03 +/- 6.63E-03 -5.48E-03 +/- 6.52E-03 U U U U U 3/27/2019 1.81E-03 +/- 7.64E-03 1.49E-03 +/- 6.04E-03 8.06E-03 +/- 8.92E-03 -3.05E-03 +/- 9.20E-03 2.66E-03 +/- 1.68E-02 U U U U U 4/3/2019 4.21E-03 +/- 6.83E-03 1.88E-03 +/- 7.52E-03 -5.16E-03 +/- 8.09E-03 6.88E-03 +/- 8.31E-03 3.14E-03 +/- 6.72E-03 U U U U U 4/10/2019 -5.68E-03 +/- 1.46E-02 7.19E-04 +/- 1.09E-02 -2.10E-03 +/- 1.00E-02 -1.06E-02 +/- 1.13E-02 -9.24E-03 +/- 2.24E-02 U U U U U 4/17/2019 -3.51E-03 +/- 6.74E-03 -3.51E-03 +/- 6.28E-03 5.65E-03 +/- 8.62E-03 5.78E-03 +/- 8.49E-03 1.23E-03 +/- 7.17E-03 U U U U U 4/24/2019 -2.00E-03 +/- 2.15E-02 -5.13E-03 +/- 7.10E-03 -8.20E-03 +/- 1.05E-02 -5.62E-03 +/- 1.26E-02 -6.90E-03 +/- 1.59E-02 U U U U U 5/1/2019 -4.21E-03 +/- 7.10E-03 3.86E-03 +/- 8.24E-03 -2.36E-03 +/- 6.96E-03 6.03E-03 +/- 9.28E-03 1.18E-02 +/- 1.58E-02 U U U U U 5/8/2019 -5.34E-04 +/- 5.73E-03 -9.44E-04 +/- 5.94E-03 -8.33E-04 +/- 6.63E-03 -3.54E-03 +/- 6.61E-03 1.44E-04 +/- 4.80E-03 U U U U U arcadis.com 51

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Sample Date Air Station M-1 Air Station M-2 Air Station M-3 Air Station M-4 Air Station M-5 (pCi/m3) (pCi/m3) (pCi/m3) (pCi/m3) (pCi/m3) 5/15/2019 (1) -4.95E-03 +/- 1.11E-02 -1.02E-03 +/- 8.62E-03 -6.52E-03 +/- 7.32E-03 -5.80E-04 +/- 7.86E-03 1.89E-02 +/- 2.62E-02 U U U U U 5/22/2019 4.08E-03 +/- 6.74E-03 5.88E-03 +/- 7.77E-03 3.53E-03 +/- 8.01E-03 2.18E-03 +/- 6.10E-03 -5.34E-04 +/- 6.33E-03 U U U U U 5/29/2019 2.30E-03 +/- 5.32E-03 -6.56E-04 +/- 6.38E-03 3.77E-03 +/- 1.02E-02 2.70E-03 +/- 6.92E-03 -5.28E-03 +/- 5.68E-03 U U U U U 6/5/2019 -1.80E-02 +/- 1.34E-02 -6.28E-03 +/- 1.28E-02 1.16E-02 +/- 1.33E-02 9.44E-03 +/- 1.29E-02 1.30E-02 +/- 1.35E-02 U U U U U 6/12/2019 2.07E-03 +/- 9.75E-03 8.30E-04 +/- 9.45E-03 5.16E-03 +/- 9.77E-03 2.22E-03 +/- 7.84E-03 -1.81E-03 +/- 1.01E-02 U U U U U 6/19/2019 -4.32E-04 +/- 5.66E-03 9.83E-03 +/- 1.13E-02 7.70E-03 +/- 8.36E-03 -6.28E-04 +/- 5.54E-03 -2.03E-03 +/- 5.62E-03 U U U U U 6/26/2019 -2.89E-03 +/- 1.20E-02 3.84E-03 +/- 9.88E-03 1.26E-02 +/- 1.32E-02 -6.55E-03 +/- 1.47E-02 -3.13E-03 +/- 1.45E-02 U U U U U 7/3/2019 4.18E-04 +/- 1.19E-02 4.06E-02 +/- 2.05E-02 2.54E-03 +/- 6.03E-03 -3.68E-03 +/- 1.08E-02 1.07E-02 +/- 1.49E-02 U UI U U U 7/11/2019 -5.66E-03 +/- 6.57E-03 2.24E-03 +/- 6.18E-03 -1.37E-03 +/- 6.03E-03 2.87E-03 +/- 7.25E-03 -1.17E-03 +/- 5.75E-03 U U U U U 7/17/2019 -1.65E-03 +/- 7.24E-03 -1.21E-03 +/- 7.47E-03 5.87E-03 +/- 6.47E-03 1.07E-03 +/- 7.80E-03 -3.77E-03 +/- 8.58E-03 U U U U U 7/24/2019 -4.64E-04 +/- 5.38E-03 4.12E-03 +/- 7.70E-03 2.17E-03 +/- 5.96E-03 -4.07E-03 +/- 6.51E-03 7.30E-03 +/- 5.48E-03 U U U U U 7/31/2019 1.22E-03 +/- 5.81E-03 5.56E-03 +/- 6.69E-03 -6.75E-03 +/- 8.09E-03 1.31E-02 +/- 1.61E-02 1.11E-03 +/- 6.43E-03 U U U UI U 8/7/2019 1.40E-03 +/- 6.61E-03 2.22E-03 +/- 5.54E-03 1.70E-03 +/- 6.31E-03 -9.68E-04 +/- 6.94E-03 1.78E-03 +/- 7.73E-03 U U U U U 8/15/2019 (2) 2.43E-03 +/- 5.30E-03 9.18E-04 +/- 6.22E-03 7.66E-04 +/- 5.36E-03 4.97E-03 +/- 4.53E-03 -1.66E-03 +/- 3.75E-03 U U U U U 8/21/2019 -1.57E-03 +/- 7.51E-03 3.33E-03 +/- 9.46E-03 3.37E-03 +/- 9.37E-03 -1.18E-03 +/- 1.01E-02 1.87E-03 +/- 1.01E-02 U U U U U 8/28/2019 7.09E-03 +/- 1.47E-02 -1.16E-02 +/- 2.72E-02 -3.60E-03 +/- 1.85E-02 2.22E-03 +/- 2.46E-02 -1.11E-02 +/- 2.67E-02 U U U U U 9/4/2019 1.09E-02 +/- 2.14E-02 8.24E-03 +/- 1.90E-02 -3.14E-03 +/- 1.94E-02 -1.12E-02 +/- 2.63E-02 -2.37E-02 +/- 2.06E-02 U U U U U 9/11/2019 5.23E-03 +/- 8.15E-03 7.24E-04 +/- 7.06E-03 -8.57E-03 +/- 8.78E-03 1.91E-03 +/- 5.61E-03 2.30E-03 +/- 1.64E-02 U U U U U 9/17/2019 -1.00E-02 +/- 1.19E-02 3.60E-03 +/- 7.06E-03 -5.11E-04 +/- 7.07E-03 1.88E-02 +/- 2.07E-02 5.39E-03 +/- 1.27E-02 U U U U U 9/25/2019 4.33E-03 +/- 1.24E-02 -4.88E-03 +/- 6.96E-03 -6.40E-03 +/- 8.86E-03 3.88E-03 +/- 7.76E-03 5.54E-04 +/- 8.21E-03 U U U U U arcadis.com 52

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Sample Date Air Station M-1 Air Station M-2 Air Station M-3 Air Station M-4 Air Station M-5 (pCi/m3) (pCi/m3) (pCi/m3) (pCi/m3) (pCi/m3) 10/2/2019 -4.63E-03 +/- 1.01E-02 -2.99E-03 +/- 9.78E-03 7.24E-03 +/- 8.45E-03 3.69E-03 +/- 1.32E-02 8.68E-04 +/- 8.63E-03 U U U U U 10/9/2019 -4.65E-03 +/- 8.85E-03 -1.22E-03 +/- 1.01E-02 1.21E-02 +/- 1.16E-02 -4.07E-04 +/- 8.01E-03 9.52E-03 +/- 1.37E-02 U U U U U 10/16/2019 -3.20E-03 +/- 8.33E-03 1.64E-03 +/- 1.27E-02 -2.62E-03 +/- 8.71E-03 -1.14E-02 +/- 1.04E-02 2.26E-03 +/- 8.26E-03 U U U U U 10/23/2019 -4.60E-03 +/- 7.03E-03 3.35E-03 +/- 8.41E-03 -5.11E-03 +/- 1.12E-02 2.53E-04 +/- 7.54E-03 -1.53E-03 +/- 6.51E-03 U U U U U 10/30/2019 1.29E-03 +/- 4.99E-03 -1.13E-03 +/- 6.17E-03 4.33E-03 +/- 5.03E-03 4.40E-03 +/- 8.62E-03 -2.18E-03 +/- 6.94E-03 U U U U U 11/6/2019 1.50E-02 +/- 9.89E-03 -4.42E-03 +/- 8.49E-03 2.22E-03 +/- 1.03E-02 7.27E-03 +/- 6.40E-03 -1.61E-03 +/- 6.31E-03 UI U U U U 11/13/2019 4.76E-03 +/- 4.90E-03 1.48E-04 +/- 7.20E-03 -2.60E-03 +/- 5.51E-03 -1.89E-03 +/- 5.14E-03 -3.48E-04 +/- 4.94E-03 U U U U U 11/20/2019 3.60E-03 +/- 1.26E-02 -5.64E-03 +/- 1.06E-02 -4.30E-03 +/- 9.18E-03 1.69E-03 +/- 9.50E-03 7.60E-03 +/- 7.94E-03 U U U U U 11/26/2019 1.43E-02 +/- 1.45E-02 2.50E-03 +/- 1.03E-02 3.92E-03 +/- 1.59E-02 1.25E-02 +/- 1.11E-02 2.99E-03 +/- 9.30E-03 U U U U U 12/4/2019 -3.59E-03 +/- 1.12E-02 -6.62E-03 +/- 1.12E-02 -6.99E-04 +/- 1.17E-02 -2.99E-03 +/- 8.43E-03 1.08E-04 +/- 7.90E-03 U U U U U 12/11/2019 2.36E-05 +/- 8.13E-03 3.43E-03 +/- 8.18E-03 -2.32E-05 +/- 7.27E-03 1.89E-03 +/- 7.21E-03 1.57E-03 +/- 5.81E-03 U U U U U 12/18/2019 -6.61E-03 +/- 7.89E-03 -1.69E-03 +/- 7.17E-03 5.42E-03 +/- 8.15E-03 -1.12E-03 +/- 1.29E-02 1.75E-03 +/- 5.34E-03 U U U U U 12/26/2019 7.38E-03 +/- 8.49E-03 3.39E-03 +/- 1.11E-02 5.01E-03 +/- 1.12E-02 -1.04E-03 +/- 9.78E-03 4.82E-04 +/- 9.31E-03 U U U U U Notes:

1 - Air Station M-5 air sampler power loss - sample collected 47.9 of ~192 hour period (Condition Report 501000027446) 2 - Air Station M-2 air sampler power loss - sample collected 113.6 of ~192 hour period (Condition Report 501000030820) arcadis.com 53

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT AIRBORNE PARTICULATES: GROSS BETA Sample Date Air Station M-1 Air Station M-2 Air Station M-3 Air Station M-4 Air Station M-5 (pCi/m3) (pCi/m3) (pCi/m3) (pCi/m3) (pCi/m3) 1/9/2019 0.0513 +/- 0.00542 0.0523 +/- 0.00567 0.0519 +/- 0.00582 0.0557 +/- 0.00549 0.0568 +/- 0.00604 1/16/2019 0.0428 +/- 0.00532 0.049 +/- 0.00551 0.0474 +/- 0.00556 0.0487 +/- 0.00514 0.0494 +/- 0.00579 1/23/2019 0.0352 +/- 0.00482 0.0339 +/- 0.00468 0.0345 +/- 0.00483 0.035 +/- 0.00446 0.0346 +/- 0.00486 1/31/2019 0.0508 +/- 0.00553 0.0462 +/- 0.00501 0.0446 +/- 0.0048 0.0457 +/- 0.00489 0.0519 +/- 0.00544 2/6/2019 0.0517 +/- 0.00675 0.0367 +/- 0.00509 0.0447 +/- 0.00581 0.0431 +/- 0.00546 0.0565 +/- 0.0072 2/13/2019 0.0321 +/- 0.00437 0.037 +/- 0.00488 0.0303 +/- 0.00455 0.0300 +/- 0.0042 0.0357 +/- 0.00485 2/20/2019 0.0416 +/- 0.00475 0.0332 +/- 0.00429 0.0555 +/- 0.00614 0.0423 +/- 0.00494 0.0452 +/- 0.00496 2/27/2019 0.0539 +/- 0.00559 0.0492 +/- 0.00529 0.0591 +/- 0.00632 0.0542 +/- 0.00573 0.0499 +/- 0.00548 3/6/2019 0.0477 +/- 0.00526 0.0386 +/- 0.0046 0.0562 +/- 0.00622 0.0432 +/- 0.00501 0.0444 +/- 0.00495 3/13/2019 0.0484 +/- 0.00542 0.0464 +/- 0.00494 0.0533 +/- 0.00568 0.0504 +/- 0.00543 0.0563 +/- 0.00587 3/20/2019 0.0371 +/- 0.00478 0.0297 +/- 0.00404 0.0372 +/- 0.0048 0.0293 +/- 0.00444 0.0348 +/- 0.00471 3/27/2019 0.029 +/- 0.00421 0.0319 +/- 0.00437 0.0269 +/- 0.00434 0.0298 +/- 0.00435 0.0341 +/- 0.00479 4/3/2019 0.0273 +/- 0.0044 0.02 +/- 0.00345 0.0236 +/- 0.00398 0.0211 +/- 0.00373 0.024 +/- 0.00403 4/10/2019 0.0231 +/- 0.00392 0.0247 +/- 0.00365 0.0281 +/- 0.00437 0.0321 +/- 0.00476 0.0263 +/- 0.0042 4/17/2019 0.0158 +/- 0.00338 0.0157 +/- 0.00303 0.0165 +/- 0.00362 0.0275 +/- 0.00446 0.0151 +/- 0.00341 4/24/2019 0.021 +/- 0.00382 0.0262 +/- 0.00397 0.0205 +/- 0.00382 0.0209 +/- 0.00369 0.0209 +/- 0.00386 5/1/2019 0.0308 +/- 0.00449 0.0247 +/- 0.00389 0.0274 +/- 0.00399 0.0256 +/- 0.00419 0.029 +/- 0.00437 5/8/2019 0.0213 +/- 0.0037 0.0194 +/- 0.00348 0.0227 +/- 0.00387 0.0231 +/- 0.00403 0.0193 +/- 0.0037 5/15/2019 (1) 0.0278 +/- 0.00408 0.029 +/- 0.00424 0.0273 +/- 0.00414 0.0237 +/- 0.00387 0.0152 +/- 0.00819 5/22/2019 0.0188 +/- 0.00352 0.0175 +/- 0.00353 0.0204 +/- 0.00382 0.0187 +/- 0.0037 0.0178 +/- 0.00363 5/29/2019 0.0115 +/- 0.00304 0.0134 +/- 0.00309 0.0159 +/- 0.00351 0.0156 +/- 0.00343 0.0144 +/- 0.00328 6/5/2019 0.0328 +/- 0.00453 0.0288 +/- 0.00423 0.0352 +/- 0.00492 0.0272 +/- 0.00414 0.0311 +/- 0.00441 6/12/2019 0.0323 +/- 0.00445 0.0294 +/- 0.00428 0.0373 +/- 0.00505 0.031 +/- 0.00454 0.0315 +/- 0.0044 6/19/2019 0.0212 +/- 0.00371 0.0247 +/- 0.00396 0.0202 +/- 0.00392 0.0207 +/- 0.00368 0.0222 +/- 0.00377 6/26/2019 0.0241 +/- 0.00394 0.0249 +/- 0.00406 0.0249 +/- 0.00416 0.0245 +/- 0.00411 0.0205 +/- 0.00385 7/3/2019 0.0254 +/- 0.00405 0.0303 +/- 0.00443 0.0265 +/- 0.00431 0.0252 +/- 0.00407 0.0308 +/- 0.0046 7/11/2019 0.0289 +/- 0.00399 0.0359 +/- 0.0043 0.0272 +/- 0.00411 0.0297 +/- 0.00396 0.0328 +/- 0.00442 7/17/2019 0.038 +/- 0.00525 0.0349 +/- 0.00498 0.0379 +/- 0.00542 0.0434 +/- 0.00582 0.0344 +/- 0.00525 7/24/2019 0.0321 +/- 0.00442 0.0327 +/- 0.00444 0.0344 +/- 0.00484 0.0339 +/- 0.00456 0.0279 +/- 0.00434 7/31/2019 0.0316 +/- 0.00446 0.0367 +/- 0.00469 0.0332 +/- 0.0048 0.0256 +/- 0.00402 0.0268 +/- 0.00416 arcadis.com 54

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Sample Date Air Station M-1 Air Station M-2 Air Station M-3 Air Station M-4 Air Station M-5 (pCi/m3) (pCi/m3) (pCi/m3) (pCi/m3) (pCi/m3) 8/7/2019 0.0476 +/- 0.00544 0.0506 +/- 0.0055 0.0489 +/- 0.00539 0.0476 +/- 0.00531 0.044 +/- 0.00523 8/15/2019 (2) 0.0292 +/- 0.00395 0.0583 +/- 0.00728 0.027 +/- 0.00381 0.0302 +/- 0.00406 0.0301 +/- 0.004 8/21/2019 0.03 +/- 0.00479 0.0289 +/- 0.00463 0.036 +/- 0.00513 0.0293 +/- 0.00463 0.0315 +/- 0.00488 8/28/2019 0.0207 +/- 0.0037 0.0284 +/- 0.00418 0.0279 +/- 0.00423 0.024 +/- 0.00389 0.0256 +/- 0.00405 9/4/2019 0.0363 +/- 0.00467 0.0289 +/- 0.0043 0.0295 +/- 0.00426 0.0295 +/- 0.00428 0.0301 +/- 0.00428 9/11/2019 0.0293 +/- 0.00428 0.0268 +/- 0.00416 0.0277 +/- 0.00413 0.0274 +/- 0.00424 0.028 +/- 0.00418 9/17/2019 0.0335 +/- 0.00503 0.0327 +/- 0.00495 0.0351 +/- 0.005 0.0341 +/- 0.00509 0.0312 +/- 0.00479 9/25/2019 0.048 +/- 0.00499 0.0487 +/- 0.00498 0.0524 +/- 0.0052 0.0509 +/- 0.00504 0.0481 +/- 0.00499 10/2/2019 0.028 +/- 0.00419 0.0201 +/- 0.00387 0.0189 +/- 0.00382 0.0217 +/- 0.00393 0.0196 +/- 0.00392 10/9/2019 0.026 +/- 0.00416 0.015 +/- 0.00346 0.0234 +/- 0.00414 0.0189 +/- 0.0037 0.0182 +/- 0.00381 10/16/2019 0.0225 +/- 0.00394 0.0225 +/- 0.00401 0.0238 +/- 0.00415 0.0234 +/- 0.00404 0.0196 +/- 0.00393 10/23/2019 0.0332 +/- 0.0049 0.0321 +/- 0.00465 0.0268 +/- 0.00416 0.0302 +/- 0.00451 0.0352 +/- 0.00522 10/30/2019 0.022 +/- 0.00388 0.0228 +/- 0.00353 0.0277 +/- 0.00421 0.0305 +/- 0.00475 0.024 +/- 0.00409 11/6/2019 0.0279 +/- 0.0042 0.0304 +/- 0.00423 0.0349 +/- 0.00485 0.0386 +/- 0.00524 0.0314 +/- 0.00441 11/13/2019 0.035 +/- 0.00468 0.0422 +/- 0.00486 0.0368 +/- 0.00469 0.042 +/- 0.00539 0.0423 +/- 0.00506 11/20/2019 0.0555 +/- 0.00565 0.0542 +/- 0.00543 0.0587 +/- 0.00603 0.0657 +/- 0.00688 0.0519 +/- 0.00547 11/26/2019 0.0331 +/- 0.00492 0.0286 +/- 0.00445 0.0271 +/- 0.00471 0.0383 +/- 0.00564 0.0269 +/- 0.00451 12/4/2019 0.0242 +/- 0.00399 0.0193 +/- 0.0033 0.0213 +/- 0.00349 0.019 +/- 0.00329 0.0233 +/- 0.00392 12/11/2019 0.0515 +/- 0.00546 0.0529 +/- 0.00539 0.0513 +/- 0.00567 0.0645 +/- 0.00681 0.0486 +/- 0.00531 12/18/2019 0.0619 +/- 0.00649 0.059 +/- 0.00584 0.0584 +/- 0.00589 0.0561 +/- 0.00593 0.0684 +/- 0.00679 12/26/2019 0.0879 +/- 0.00656 0.0853 +/- 0.00627 0.0905 +/- 0.00688 0.107 +/- 0.00809 0.0821 +/- 0.00632 Notes:

1 - Air Station M-5 air sampler power loss - sample collected 47.9 of ~192 hour period (Condition Report 501000027446) 2 - Air Station M-2 air sampler power loss - sample collected 113.6 of ~192 hour period (Condition Report 501000030820) arcadis.com 55

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT AIRBORNE PARTICULATES: GAMMA ISOTOPIC Air Station M-1 Qtr 1 Qtr 2 Qtr 3 Qtr 4 (pCi/m3) (pCi/m3) (pCi/m3) (pCi/m3)

Barium-140 -3.79E-03 +/- 5.68E-03 1.33E-03 +/- 2.72E-03 1.86E-03 +/- 2.86E-03 -1.81E-03 +/- 4.64E-03 U U U U Beryllium-7 7.79E-02 +/- 1.03E-02 9.70E-02 +/- 9.31E-03 6.70E-02 +/- 9.25E-03 5.38E-02 +/- 8.58E-03 Cerium-141 -8.66E-05 +/- 6.36E-04 -1.78E-04 +/- 4.04E-04 -2.75E-04 +/- 4.36E-04 2.41E-05 +/- 4.43E-04 U U U U Cerium-144 -3.43E-04 +/- 1.21E-03 1.21E-04 +/- 9.63E-04 -1.25E-04 +/- 1.06E-03 -4.21E-05 +/- 1.19E-03 U U U U Cesium-134 -5.46E-05 +/- 3.31E-04 8.19E-05 +/- 3.08E-04 3.87E-05 +/- 3.61E-04 -1.92E-04 +/- 2.87E-04 U U U U Cesium-137 8.69E-05 +/- 3.49E-04 1.65E-04 +/- 3.19E-04 -2.32E-06 +/- 2.71E-04 -2.63E-04 +/- 3.37E-04 U U U U Cobalt-58 1.30E-05 +/- 3.94E-04 2.00E-04 +/- 2.74E-04 6.29E-04 +/- 5.01E-04 3.12E-04 +/- 3.41E-04 U U UI U Cobalt-60 -9.85E-05 +/- 3.30E-04 1.31E-04 +/- 3.68E-04 -4.17E-05 +/- 3.47E-04 2.45E-04 +/- 3.18E-04 U U U U Lanthanum-140 -6.49E-04 +/- 2.66E-03 1.01E-03 +/- 1.10E-03 -6.30E-05 +/- 1.00E-03 -1.50E-04 +/- 1.48E-03 U U U U Manganese-54 -5.95E-05 +/- 3.35E-04 -8.78E-05 +/- 3.08E-04 7.14E-05 +/- 3.10E-04 1.19E-04 +/- 2.56E-04 U U U U Niobium-95 -1.72E-05 +/- 3.11E-04 4.37E-04 +/- 3.58E-04 -7.06E-05 +/- 3.62E-04 2.61E-06 +/- 3.25E-04 U U U U Ruthenium-103 -7.14E-05 +/- 4.43E-04 -3.61E-04 +/- 3.17E-04 -1.07E-04 +/- 2.96E-04 5.25E-05 +/- 3.51E-04 U U U U Ruthenium-106 3.78E-03 +/- 3.51E-03 1.68E-03 +/- 2.51E-03 1.36E-03 +/- 2.24E-03 2.94E-03 +/- 2.29E-03 U U U U Zinc-65 -4.22E-04 +/- 6.79E-04 7.10E-05 +/- 5.80E-04 -1.03E-04 +/- 7.20E-04 1.78E-05 +/- 6.00E-04 U U U U Zirconium-95 -2.05E-04 +/- 7.13E-04 5.23E-04 +/- 6.55E-04 5.89E-04 +/- 5.85E-04 2.32E-04 +/- 6.37E-04 U U U U arcadis.com 56

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Air Station M-2 Qtr 1 Qtr 2 Qtr 3 Qtr 4 (pCi/m3) (pCi/m3) (pCi/m3) (pCi/m3)

Barium-140 -3.11E-03 +/- 4.12E-03 6.98E-04 +/- 1.55E-03 -3.52E-04 +/- 2.22E-03 2.13E-03 +/- 3.70E-03 U U U U Beryllium-7 6.60E-02 +/- 8.97E-03 8.20E-02 +/- 6.86E-03 8.05E-02 +/- 7.21E-03 5.85E-02 +/- 7.54E-03 Cerium-141 -1.89E-04 +/- 5.04E-04 -1.04E-04 +/- 3.05E-04 -2.93E-04 +/- 4.59E-04 -5.31E-06 +/- 6.69E-04 U U U U Cerium-144 -6.05E-04 +/- 1.12E-03 -4.35E-04 +/- 6.75E-04 -9.63E-05 +/- 1.23E-03 4.64E-04 +/- 1.34E-03 U U U U Cesium-134 2.02E-05 +/- 2.95E-04 -1.95E-05 +/- 1.60E-04 2.15E-04 +/- 2.38E-04 3.09E-04 +/- 3.01E-04 U U U U Cesium-137 3.12E-05 +/- 2.53E-04 -1.77E-05 +/- 1.41E-04 5.33E-05 +/- 2.24E-04 -1.41E-04 +/- 2.79E-04 U U U U Cobalt-58 4.84E-04 +/- 5.61E-04 7.72E-05 +/- 1.98E-04 9.31E-06 +/- 2.60E-04 4.83E-05 +/- 3.22E-04 U U U U Cobalt-60 -6.19E-06 +/- 2.57E-04 -1.15E-04 +/- 2.18E-04 -2.02E-04 +/- 2.59E-04 -5.99E-05 +/- 2.78E-04 U U U U Lanthanum-140 -5.39E-04 +/- 1.80E-03 -9.85E-04 +/- 7.06E-04 -1.25E-04 +/- 1.00E-03 -6.47E-04 +/- 1.25E-03 U U U U Manganese-54 7.89E-06 +/- 2.90E-04 1.75E-05 +/- 1.76E-04 -3.37E-05 +/- 2.27E-04 -2.05E-04 +/- 2.52E-04 U U U U Niobium-95 -1.35E-04 +/- 3.54E-04 -4.19E-05 +/- 1.96E-04 -8.64E-05 +/- 3.01E-04 3.14E-06 +/- 3.16E-04 U U U U Ruthenium-103 -1.88E-04 +/- 3.64E-04 -2.97E-05 +/- 2.06E-04 1.57E-05 +/- 2.89E-04 -1.03E-04 +/- 3.53E-04 U U U U Ruthenium-106 1.77E-04 +/- 2.38E-03 9.32E-04 +/- 1.29E-03 -4.23E-04 +/- 1.71E-03 -1.17E-03 +/- 2.57E-03 U U U U Zinc-65 -1.81E-04 +/- 6.58E-04 3.08E-05 +/- 4.35E-04 -6.92E-05 +/- 5.54E-04 -2.31E-04 +/- 6.68E-04 U U U U Zirconium-95 3.21E-04 +/- 5.62E-04 1.04E-04 +/- 3.00E-04 -9.43E-05 +/- 4.87E-04 4.39E-05 +/- 5.68E-04 U U U U arcadis.com 57

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Air Station M-3 Qtr 1 Qtr 2 Qtr 3 Qtr 4 (pCi/m3) (pCi/m3) (pCi/m3) (pCi/m3)

Barium-140 -3.25E-04 +/- 6.15E-03 2.83E-03 +/- 2.86E-03 -1.87E-03 +/- 3.50E-03 -3.64E-04 +/- 3.50E-03 U U U U Beryllium-7 7.95E-02 +/- 1.13E-02 9.82E-02 +/- 1.01E-02 8.07E-02 +/- 8.22E-03 4.78E-02 +/- 8.74E-03 Cerium-141 1.32E-04 +/- 7.54E-04 7.75E-05 +/- 4.04E-04 -1.53E-04 +/- 3.99E-04 -2.34E-04 +/- 5.23E-04 U U U U Cerium-144 -1.23E-04 +/- 1.63E-03 -4.21E-04 +/- 1.27E-03 4.24E-04 +/- 1.21E-03 -4.19E-04 +/- 9.77E-04 U U U U Cesium-134 -9.60E-05 +/- 3.21E-04 2.88E-05 +/- 2.84E-04 -7.42E-05 +/- 2.78E-04 3.57E-05 +/- 2.58E-04 U U U U Cesium-137 -2.74E-04 +/- 3.82E-04 2.99E-04 +/- 2.00E-04 -1.55E-04 +/- 2.53E-04 1.70E-04 +/- 2.75E-04 U U U U Cobalt-58 -6.20E-05 +/- 3.51E-04 8.34E-05 +/- 3.38E-04 -9.22E-05 +/- 3.10E-04 -1.10E-04 +/- 3.91E-04 U U U U Cobalt-60 -1.52E-04 +/- 3.82E-04 9.50E-05 +/- 3.70E-04 1.29E-04 +/- 3.06E-04 -1.33E-04 +/- 3.24E-04 U U U U Lanthanum-140 -1.59E-03 +/- 2.46E-03 -8.01E-04 +/- 8.84E-04 1.42E-04 +/- 9.28E-04 9.72E-04 +/- 1.22E-03 U U U U Manganese-54 -9.32E-06 +/- 3.20E-04 2.46E-04 +/- 3.88E-04 3.73E-04 +/- 3.17E-04 1.30E-05 +/- 2.81E-04 U U U U Niobium-95 7.53E-06 +/- 4.30E-04 -7.69E-05 +/- 2.66E-04 -2.62E-06 +/- 2.85E-04 6.37E-05 +/- 3.12E-04 U U U U Ruthenium-103 1.37E-04 +/- 4.31E-04 1.60E-04 +/- 2.87E-04 -1.78E-04 +/- 3.66E-04 5.46E-04 +/- 3.46E-04 U U U U Ruthenium-106 -2.16E-03 +/- 3.35E-03 -1.21E-03 +/- 2.06E-03 1.26E-03 +/- 2.54E-03 7.20E-04 +/- 2.66E-03 U U U U Zinc-65 4.32E-04 +/- 9.49E-04 2.16E-04 +/- 6.83E-04 -2.08E-04 +/- 4.78E-04 9.16E-04 +/- 7.80E-04 U U U U Zirconium-95 -2.31E-04 +/- 7.30E-04 -1.13E-04 +/- 6.24E-04 2.16E-04 +/- 5.26E-04 2.96E-04 +/- 7.38E-04 U U U U arcadis.com 58

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Air Station M-4 Qtr 1 Qtr 2 Qtr 3 Qtr 4 (pCi/m3) (pCi/m3) (pCi/m3) (pCi/m3)

Barium-140 -1.33E-03 +/- 4.13E-03 4.11E-03 +/- 3.06E-03 -1.59E-03 +/- 2.53E-03 9.07E-04 +/- 2.70E-03 U U U U Beryllium-7 7.52E-02 +/- 9.09E-03 9.57E-02 +/- 8.91E-03 7.42E-02 +/- 8.66E-03 5.62E-02 +/- 7.85E-03 Cerium-141 5.45E-04 +/- 8.48E-04 -1.06E-04 +/- 3.52E-04 6.11E-04 +/- 7.91E-04 -2.62E-04 +/- 4.12E-04 U U U U Cerium-144 3.10E-04 +/- 1.10E-03 -3.58E-04 +/- 8.84E-04 1.04E-04 +/- 1.21E-03 -1.49E-04 +/- 8.61E-04 U U U U Cesium-134 -9.73E-05 +/- 2.48E-04 5.58E-05 +/- 2.70E-04 8.37E-05 +/- 2.66E-04 -5.26E-05 +/- 2.66E-04 U U U U Cesium-137 4.31E-05 +/- 2.64E-04 3.92E-04 +/- 4.39E-04 -3.12E-05 +/- 2.71E-04 -9.01E-06 +/- 1.95E-04 U U U U Cobalt-58 7.89E-05 +/- 2.51E-04 3.68E-04 +/- 5.61E-04 -6.52E-06 +/- 2.92E-04 1.57E-04 +/- 2.76E-04 U U U U Cobalt-60 3.77E-05 +/- 2.38E-04 1.10E-04 +/- 2.67E-04 -1.09E-05 +/- 2.11E-04 6.35E-05 +/- 2.85E-04 U U U U Lanthanum-140 5.40E-04 +/- 1.44E-03 3.03E-04 +/- 5.80E-04 1.22E-04 +/- 1.33E-03 4.20E-04 +/- 1.25E-03 U U U U Manganese-54 1.12E-04 +/- 2.67E-04 2.82E-04 +/- 2.56E-04 -7.63E-05 +/- 2.79E-04 2.09E-04 +/- 2.14E-04 U UI U U Niobium-95 4.62E-05 +/- 3.65E-04 3.25E-04 +/- 2.43E-04 -2.18E-04 +/- 3.17E-04 1.53E-04 +/- 2.76E-04 U U U U Ruthenium-103 -1.51E-04 +/- 3.71E-04 2.33E-04 +/- 2.62E-04 1.25E-04 +/- 3.17E-04 -2.81E-06 +/- 2.70E-04 U U U U Ruthenium-106 7.88E-04 +/- 2.30E-03 -3.52E-04 +/- 1.74E-03 -1.52E-04 +/- 2.65E-03 2.10E-03 +/- 1.98E-03 U U U U Zinc-65 -2.17E-04 +/- 5.61E-04 -3.95E-04 +/- 6.33E-04 3.79E-04 +/- 6.97E-04 -1.91E-04 +/- 5.14E-04 U U U U Zirconium-95 5.28E-04 +/- 5.42E-04 -1.74E-04 +/- 4.27E-04 5.91E-04 +/- 6.91E-04 1.41E-04 +/- 3.97E-04 U U U U arcadis.com 59

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Air Station M-5 Qtr 1 Qtr 2 Qtr 3 Qtr 4 (pCi/m3) (pCi/m3) (pCi/m3) (pCi/m3)

Barium-140 -1.41E-03 +/- 4.94E-03 1.60E-04 +/- 2.04E-03 1.62E-03 +/- 2.49E-03 1.56E-03 +/- 3.02E-03 U U U U Beryllium-7 7.57E-02 +/- 1.01E-02 8.46E-02 +/- 9.06E-03 7.36E-02 +/- 8.29E-03 4.98E-02 +/- 7.02E-03 Cerium-141 -1.66E-04 +/- 3.10E-04 -9.98E-05 +/- 3.56E-04 6.92E-05 +/- 4.05E-04 -1.98E-06 +/- 4.12E-04 U U U U Cerium-144 -9.02E-04 +/- 8.40E-04 -5.50E-04 +/- 9.86E-04 -2.91E-04 +/- 1.06E-03 -7.54E-05 +/- 9.45E-04 U U U U Cesium-134 -1.96E-04 +/- 2.97E-04 1.13E-04 +/- 2.28E-04 -1.81E-04 +/- 2.97E-04 1.21E-04 +/- 2.16E-04 U U U U Cesium-137 -6.38E-07 +/- 3.55E-04 8.00E-05 +/- 2.27E-04 4.24E-05 +/- 2.03E-04 1.60E-04 +/- 2.30E-04 U U U U Cobalt-58 9.98E-05 +/- 3.09E-04 -1.44E-04 +/- 3.01E-04 2.99E-05 +/- 2.38E-04 1.57E-05 +/- 2.74E-04 U U U U Cobalt-60 1.59E-04 +/- 4.33E-04 3.42E-04 +/- 2.76E-04 -2.81E-04 +/- 2.66E-04 -4.78E-05 +/- 2.13E-04 U U U U Lanthanum-140 -8.64E-05 +/- 2.61E-03 -5.25E-04 +/- 9.55E-04 -1.56E-04 +/- 8.09E-04 -8.49E-05 +/- 9.35E-04 U U U U Manganese-54 2.04E-04 +/- 3.15E-04 1.34E-04 +/- 2.15E-04 2.13E-04 +/- 1.97E-04 1.57E-04 +/- 2.53E-04 U U U U Niobium-95 -6.78E-05 +/- 4.31E-04 -1.80E-04 +/- 2.36E-04 -3.19E-04 +/- 3.73E-04 -2.14E-05 +/- 2.82E-04 U U U U Ruthenium-103 3.50E-04 +/- 3.60E-04 7.35E-05 +/- 2.58E-04 -2.75E-05 +/- 2.88E-04 -4.81E-05 +/- 2.90E-04 U U U U Ruthenium-106 -6.96E-04 +/- 2.42E-03 4.70E-04 +/- 2.25E-03 -8.49E-04 +/- 2.06E-03 -1.29E-03 +/- 1.87E-03 U U U U Zinc-65 -1.25E-05 +/- 8.34E-04 -2.60E-04 +/- 5.35E-04 -2.16E-04 +/- 4.64E-04 7.43E-04 +/- 7.51E-04 U U U U Zirconium-95 -2.44E-04 +/- 7.95E-04 4.83E-04 +/- 5.24E-04 7.16E-05 +/- 4.89E-04 -2.10E-04 +/- 4.79E-04 U U U U arcadis.com 60

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT SEDIMENT: GAMMA ISOTOPIC M-8c Upstream of plant Qtr 2 Qtr 4 M-9 Downstream of plant Qtr 2 Qtr 4 (pCi/Kg, dry) (pCi/Kg, dry) (pCi/Kg, dry) (pCi/Kg, dry)

Barium-140 166 +/- 137 U 21.3 +/- 103 U Barium-140 -75.7 +/- 188 U -18.4 +/- 194 U Beryllium-7 -32.6 +/- 263 U 131 +/- 194 U Beryllium-7 561 +/- 344 U 1040 +/- 529 Cerium-144 -111 +/- 131 U 36.9 +/- 105 U Cerium-144 12.9 +/- 149 U -143 +/- 182 U Cesium-134 -2.96 +/- 30.8 U 11.3 +/- 24 U Cesium-134 -5.03 +/- 39.2 U 80.8 +/- 38.8 UI Cesium-137 29.9 +/- 32.9 U 10 +/- 20.7 U Cesium-137 61.4 +/- 54.1 UI 120 +/- 48.6 M Cobalt-58 10.3 +/- 25.2 U -10.2 +/- 15.9 U Cobalt-58 -0.694 +/- 31.7 U 4.03 +/- 26.4 U Cobalt-60 -25.2 +/- 37.2 U -23.9 +/- 20.1 U Cobalt-60 -2.32 +/- 40.1 U 35.8 +/- 31.1 U Iron-59 -17.8 +/- 60.2 U 20.3 +/- 46.9 U Iron-59 -43.1 +/- 74.4 U -68.8 +/- 69.2 U Lanthanum-140 26 +/- 42.6 U -12.2 +/- 33.7 U Lanthanum-140 -32.7 +/- 71.1 U -16.1 +/- 42.2 U Manganese-54 12.4 +/- 29.1 U 14.1 +/- 19.9 U Manganese-54 -9.71 +/- 32.9 U -2.53 +/- 37.7 U Niobium-95 0.627 +/- 32.3 U 0.288 +/- 21.5 U Niobium-95 6.16 +/- 40.5 U -17.7 +/- 29 U Potassium-40 11800 +/- 1340 11900 +/- 1070 Potassium-40 13700 +/- 1680 13700 +/- 1560 Ruthenium-103 -4.85 +/- 24.4 U 6.1 +/- 17.9 U Ruthenium-103 -1.52 +/- 34.5 U 16.1 +/- 29.4 U Ruthenium-106 -12.1 +/- 238 U 47.5 +/- 159 U Ruthenium-106 267 +/- 291 U 83.3 +/- 272 U Zinc-65 3.44 +/- 66.2 U 22.5 +/- 54.4 U Zinc-65 18.5 +/- 82.1 U -27.1 +/- 88.8 U Zirconium-95 -20.4 +/- 44.1 U -8.18 +/- 37 U Zirconium-95 -32.3 +/- 61.8 U -18.3 +/- 51.9 U arcadis.com 61

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT M-15 Montissippi Park Qtr 2 Qtr 4 (pCi/Kg, dry) (pCi/Kg, dry)

Barium-140 77 +/- 148 U -578 +/- 3390 U Beryllium-7 588 +/- 584 UI 459 +/- 819 U Cerium-144 -12.9 +/- 128 U -39.2 +/- 123 U Cesium-134 -13.1 +/- 26.7 U 104 +/- 46.9 UI Cesium-137 20.2 +/- 30.7 U 17.5 +/- 22.7 U Cobalt-58 -18.1 +/- 26.1 U -2.18 +/- 35.1 U Cobalt-60 10.7 +/- 25.2 U -1.04 +/- 22.3 U Iron-59 -7.69 +/- 51.9 U -18.2 +/- 125 U Lanthanum-140 -20.7 +/- 45.3 U -1050 +/- 1390 U Manganese-54 7.37 +/- 23.1 U 28.9 +/- 25.5 U Niobium-95 5.09 +/- 32.3 U -38.3 +/- 48.5 U Potassium-40 12700 +/- 1420 23100 +/- 1190 Ruthenium-103 4.08 +/- 26 U -4.67 +/- 62.9 U Ruthenium-106 48.5 +/- 226 U 57.2 +/- 168 U Zinc-65 -15.4 +/- 62.1 U -8.41 +/- 63 U Zirconium-95 -17.6 +/- 49.8 U 12.8 +/- 78.1 U arcadis.com 62

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT TISSUE - FISH: GAMMA ISOTOPIC (pCi/Kg, M-8c Upstream of plant M-9 Downstream of plant wet) May Sep May Sep Fish 1 Fish 2 Fish 1 Fish 2 Fish 1 Fish 2 Fish 1 Fish 2

-14.7 +/- 20.1 1420 +/- 2800 -62.8 +/- 55.3 39.7 +/- 61.1 -6.09 +/- 23 1250 +/- 2610 2.6 +/- 40.2 -26.4 +/- 45.9 Barium-140 U U U U U U U U

-11.1 +/- 21.5 -1.69 +/- 34.4 15.7 +/- 43.6 -12.7 +/- 53.7 -7.5 +/- 20.5 13.5 +/- 30.4 6.35 +/- 35.9 3.56 +/- 38.7 Cerium-144 U U U U U U U U 2.01 +/- 5.09 9.27 +/- 10.5 -0.309 +/- 6.9 -3.2 +/- 12.3 1.92 +/- 4.95 2.79 +/- 5.78 -0.652 +/- 8.36 2.41 +/- 7.47 Cesium-134 U U U U U U U U 1.72 +/- 3.78 4.53 +/- 8.44 2.71 +/- 8.28 1.06 +/- 11.4 4.14 +/- 5.31 2.46 +/- 5.49 4.12 +/- 5.99 6.11 +/- 7.22 Cesium-137 U U U U U U U U 3.64 +/- 3.61 10.9 +/- 11 -2.14 +/- 7.74 -2.24 +/- 10.2 0.333 +/- 5.08 -5.5 +/- 12 0.835 +/- 5.83 3.66 +/- 7.51 Cobalt-58 U U U U U U U U

-0.302 +/- 3.62 -0.0298 +/- 5.97 5 +/- 9.22 4.4 +/- 8.87 0.855 +/- 5.3 2.33 +/- 4.13 8.01 +/- 9.09 Cobalt-60 -2.35 +/- 10.1 U U U U U U U 0.285 +/- 9.54 -5.6 +/- 42.8 23.7 +/- 15.6 10.5 +/- 14.5 14.3 +/- 11.8 -6.67 +/- 47 -5.61 +/- 17.1 -4.4 +/- 17.2 Iron-59 U U U U U U U U Lanthanum- 0.813 +/- 6.17 272 +/- 1020 4.15 +/- 12.3 -16.9 +/- 18.8 10.6 +/- 7.73 87.5 +/- 854 0.22 +/- 13.3 4.49 +/- 14.2 140 U U U U U U U U Manganese 0.5 +/- 3.79 0.753 +/- 5.84 0.25 +/- 6.98 5.67 +/- 10.7 1.37 +/- 4.62 2.71 +/- 4.74 2.22 +/- 5.9 3.49 +/- 7.37

-54 U U U U U U U U 1.92 +/- 3.89 8.45 +/- 11.3 11.2 +/- 9.36 9.95 +/- 9.64 -0.729 +/- 5.43 -0.307 +/- 14.9 -3.07 +/- 8.75 -3.95 +/- 7.06 Niobium-95 U U U U U U U U Potassium-3020 +/- 224 3160 +/- 313 3500 +/- 474 3600 +/- 458 2790 +/- 238 2730 +/- 249 3290 +/- 395 3230 +/- 434 40 4 +/- 9.86 -0.605 +/- 14.4 -4.86 +/- 19.1 1.35 +/- 16.3 2.13 +/- 13.1 7.19 +/- 15.4 4.8 +/- 19.2 7.67 +/- 19.5 Zinc-65 U U U U U U U U Zirconium- -0.0203 +/- 7.38 0.369 +/- 22.1 7.97 +/- 15.2 -0.72 +/- 17.5 -6.09 +/- 11.1 -19.5 +/- 21.7 0.254 +/- 11 3.6 +/- 13.5 95 U U U U U U U U arcadis.com 63

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT TISSUE - INVERTEBRATE: GAMMA ISOTOPIC M-9 Downstream of plant M-8c Upstream of plant (pCi/Kg, wet)

Qtr 2 Qtr 3

-150 +/- 401 -127 +/- 467 Barium-140 U U

-227 +/- 576 338 +/- 403 Beryllium-7 U U

-86.2 +/- 334 54.9 +/- 193 Cerium-144 U U

-17.4 +/- 101 -24.6 +/- 50.9 Cesium-134 U U 69.4 +/- 72.9 -23.5 +/- 45.2 Cesium-137 U U 25.2 +/- 71 18.1 +/- 47.2 Cobalt-58 U U 35.9 +/- 84.7 10.9 +/- 49.8 Cobalt-60 U U

-50.3 +/- 179 32.1 +/- 127 Iron-59 U U

-48.3 +/- 149 66.5 +/- 174 Lanthanum-140 U U 52.9 +/- 80.9 -5.32 +/- 49.4 Manganese-54 U U 4.68 +/- 91.5 46.8 +/- 50.9 Niobium-95 U U 1420 +/- 1300 1110 +/- 1420 Potassium-40 UI UI 20.6 +/- 70.8 5.08 +/- 53.8 Ruthenium-103 U U 219 +/- 637 222 +/- 421 Ruthenium-106 U U 60.1 +/- 155 -41.4 +/- 111 Zinc-65 U U 4.25 +/- 129 -85 +/- 96.4 Zirconium-95 U U arcadis.com 64

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT TISSUE - PLANT: GAMMA ISOTOPIC M-41 Training Center M-42 Biology Station Road M-43 Imholte Farm pCi/Kg Jul Aug Sep Jul Aug Sep Jul Aug Sep 3.35 +/- 9.66 7.46 +/- 9.42 -0.619 +/- 13.5 8.32 +/- 11.4 9.2 +/- 9.98 4.52 +/- 14 2.2 +/- 9.24 4.66 +/- 16.2 3.29 +/- 17.1 Cesium-134 U U U U U U U U U

-0.285 +/- 8.35 3.36 +/- 8.65 19.3 +/- 21.4 16.2 +/- 11.1 -8.31 +/- 10.2 15.1 +/- 14.5 -0.344 +/- 9.48 9.92 +/- 12.7 3.45 +/- 16.5 Cesium-137 U U U U U U U U U

-1.43 +/- 9.18 -1.4 +/- 8.11 2.98 +/- 12.9 -0.0224 +/- 9.7 2.67 +/- 9.59 -4.13 +/- 13.7 1.15 +/- 8.04 0.427 +/- 12.8 -13.3 +/- 17 Cobalt-58 U U U U U U U U U

-8.35 +/- 11.3 1.71 +/- 8.59 -14.6 +/- 14.5 1.02 +/- 11.2 5.13 +/- 11.1 1.47 +/- 14.3 -7.66 +/- 9.84 -3.35 +/- 11 1.98 +/- 17.3 Cobalt-60 U U U U U U U U U 2.2 +/- 11.5 -6.9 +/- 11.8 -5.0 +/- 25.8 7.8 +/- 14.7 -6.8 +/- 13.8 19.4 +/- 27.8 -13.2 +/- 15.4 8.6 +/- 19.7 13.3 +/- 30.8 Iodine-131 U U U U U U U U U 4.2 +/- 17.7 9.87 +/- 18.9 48.8 +/- 47 12.4 +/- 21.9 -6.87 +/- 23.5 37.1 +/- 36.3 9.58 +/- 19.4 10.1 +/- 23 -24.7 +/- 36.5 Iron-59 U U U U U U U U U Manganese- -3.55 +/- 9.82 1.72 +/- 8.71 -7.85 +/- 12.8 3.39 +/- 9.39 1.67 +/- 9.4 7 +/- 15.4 0.556 +/- 9.28 1.1 +/- 13 -3.67 +/- 16.5 54 U U U U U U U U U 7.82 +/- 11.3 2.29 +/- 8.97 -10.4 +/- 15.8 0.083 +/- 11.2 6.74 +/- 9.97 10.6 +/- 15.2 1.68 +/- 8.59 8.29 +/- 12.7 -4.66 +/- 21.5 Niobium-95 U U U U U U U U U 39.6 +/- 52.2 -13.8 +/- 20.2 -6.35 +/- 33.8 12.6 +/- 26.1 10.7 +/- 23.6 9.44 +/- 32.3 4.83 +/- 24.7 -6.4 +/- 24.2 5.29 +/- 33.1 Zinc-65 UI U U U U U U U U WATER: TRITIUM pCi/L Jan Mar Apr Jun Jul Sep Oct Nov Dec M-11 City of 83.4 +/- 207 60.5 +/- 126 187 +/- 236 -71.1 +/- 117 Monticello U U U U M-12 Plant 98 +/- 211 -9.46 +/- 111 -127 +/- 212 -103 +/- 117 Well #11 U U U U M-14 City of 29.6 +/- 129 77.3 +/- 218 -8.81 +/- 232 -135 +/- 253 Minneapolis U U U U M-43 Imholte 256 +/- 224 62.8 +/- 127 291 +/- 243 51.5 +/- 92 Farm U U U U M-55

-111 +/- 185 50.9 +/- 125 61.9 +/- 229 92.7 +/- 95.1 Hasbrouck U U U U Residence M-8 130 +/- 216 127 +/- 251 -227 +/- 241 Upstream of U U U plant M-9 25.2 +/- 127 99.4 +/- 213 -163 +/- 218 -208 +/- 251 Downstream U U U U of plant arcadis.com 65

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT WATER - DRINKING: GROSS BETA M-14 City of Gross Beta Minneapolis (pCi/L)

Jan 2.550 +/- 1.980 U Feb -0.370 +/- 2.300 U Mar 1.990 +/- 2.240 U Apr 2.970 +/- 1.670 M May 0.894 +/- 1.960 U Jun 1.340 +/- 2.080 U Jul 1.430 +/- 1.400 U Aug 1.660 +/- 1.540 U Sep 2.110 +/- 2.140 U Oct -0.111 +/- 2.050 U Nov 1.780 +/- 1.990 U Dec 2.120 +/- 2.350 U arcadis.com 66

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT WATER - DRINKING: IODINE-131 M-14 City of Iodine-131 M-14 City of Iodine-131 Minneapolis (pCi/L) Minneapolis (pCi/L) 1/7/2019 -4.04E-02 +/- 3.78E-01 U 7/11/2019 -1.79E-01 +/- 5.52E-01 U 1/16/2019 2.58E-01 +/- 4.99E-01 U 7/17/2019 -4.64E-01 +/- 4.82E-01 U 1/23/2019 -1.79E-02 +/- 3.92E-01 U 7/24/2019 3.91E-01 +/- 5.40E-01 U 1/29/2019 -2.06E-01 +/- 2.89E-01 U 7/31/2019 5.43E-01 +/- 5.84E-01 U 2/6/2019 1.88E-02 +/- 4.83E-01 U 8/7/2019 -8.49E-01 +/- 3.98E-01 U 2/13/2019 -3.33E-01 +/- 3.57E-01 U 8/14/2019 -2.47E-01 +/- 4.47E-01 U 2/19/2019 1.05E-01 +/- 3.57E-01 U 8/21/2019 1.33E-01 +/- 4.54E-01 U 2/27/2019 4.52E-01 +/- 4.90E-01 U 8/27/2019 -7.05E-02 +/- 1.52E+00 U 3/6/2019 5.96E-01 +/- 5.65E-01 U 9/4/2019 7.55E-02 +/- 5.58E-01 U 3/13/2019 2.79E-01 +/- 5.59E-01 U 9/11/2019 3.30E-01 +/- 4.38E-01 U 3/20/2019 -2.79E-01 +/- 4.69E-01 U 9/18/2019 2.10E-01 +/- 4.27E-01 U 3/27/2019 4.23E-01 +/- 5.48E-01 U 9/25/2019 -1.63E-01 +/- 2.90E-01 U 4/3/2019 -1.79E-01 +/- 4.54E-01 U 10/2/2019 -2.54E-01 +/- 2.23E-01 U 4/10/2019 -1.91E-01 +/- 4.22E-01 U 10/9/2019 4.14E-01 +/- 5.21E-01 U 4/17/2019 1.41E-01 +/- 5.12E-01 U 10/16/2019 -7.84E-02 +/- 4.65E-01 U 4/24/2019 2.41E-01 +/- 5.35E-01 U 10/23/2019 -2.36E-01 +/- 3.30E-01 U 5/1/2019 2.43E-02 +/- 1.99E-01 U 10/30/2019 -1.53E-01 +/- 5.16E-01 U 5/8/2019 -1.24E-01 +/- 5.51E-01 U 11/6/2019 2.59E-01 +/- 5.57E-01 U 5/15/2019 1.34E-01 +/- 3.31E-01 U 11/13/2019 3.68E-01 +/- 5.50E-01 U 5/22/2019 1.66E-01 +/- 5.60E-01 U 11/20/2019 1.33E-01 +/- 4.50E-01 U 5/29/2019 1.57E-01 +/- 5.18E-01 U 11/26/2019 5.69E-02 +/- 3.15E-01 U 6/5/2019 -2.35E-01 +/- 4.01E-01 U 12/4/2019 7.09E-01 +/- 4.68E-01 U 6/12/2019 -1.61E-01 +/- 4.45E-01 U 12/11/2019 9.20E-01 +/- 5.88E-01 U 6/19/2019 -1.12E+00 +/- 3.44E-01 U 12/18/2019 -3.56E-02 +/- 4.78E-01 U 6/26/2019 -3.36E-01 +/- 3.17E-01 U 12/26/2019 5.90E-01 +/- 5.17E-01 U 7/3/2019 -1.54E+00 +/- 4.16E-01 U arcadis.com 67

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT WATER - GROUNDWATER: GAMMA ISOTOPIC Qtr 1 Qtr 2 Qtr 3 Qtr 4 M-11 City of Monticello (pCi/L) (pCi/L) (pCi/L) (pCi/L) 1.22 +/- 4.97 0.181 +/- 5.94 -2.35 +/- 6.33 7.33 +/- 4.61 Barium-140 U U U U

-3.31 +/- 6.41 -3.69 +/- 6.37 0.0441 +/- 5.29 4.52 +/- 5.41 Cerium-144 U U U U 0.462 +/- 1.06 0.278 +/- 0.889 0.142 +/- 0.863 -0.62 +/- 0.882 Cesium-134 U U U U 0.454 +/- 1.02 -0.451 +/- 0.907 -1.05 +/- 1.98 -0.45 +/- 0.756 Cesium-137 U U U U

-0.862 +/- 0.962 -0.433 +/- 0.79 0.515 +/- 0.826 -0.422 +/- 0.826 Cobalt-58 U U U U 0.469 +/- 0.95 -0.306 +/- 0.922 -0.0326 +/- 0.823 0.518 +/- 0.842 Cobalt-60 U U U U 1.61 +/- 1.85 Iodine-131 1 (1) (1) (1)

U

-0.759 +/- 2.34 0.305 +/- 1.94 -0.27 +/- 1.51 -1.05 +/- 1.6 Iron-59 U U U U 0.493 +/- 1.79 0.713 +/- 1.99 -0.5 +/- 1.58 -0.471 +/- 1.69 Lanthanum-140 U U U U

-0.363 +/- 0.965 0.308 +/- 0.894 -0.53 +/- 0.848 0.404 +/- 0.768 Manganese-54 U U U U 0.0192 +/- 1.03 -1.12 +/- 1.73 -0.164 +/- 0.834 -0.0995 +/- 0.906 Niobium-95 U U U U

-2.3 +/- 2.16 0.461 +/- 1.87 0.0783 +/- 1.63 -0.387 +/- 1.62 Zinc-65 U U U U 0.855 +/- 1.8 0.89 +/- 1.5 -0.307 +/- 1.56 -0.0617 +/- 1.42 Zirconium-95 U U U U I I-131 analysis not required arcadis.com 68

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Qtr 1 Qtr 2 Qtr 3 Qtr 4 M-12 Plant Well #11 (pCi/L) (pCi/L) (pCi/L) (pCi/L)

-4.8 +/- 6.91 1.2 +/- 5.74 -1.77 +/- 5.62 3.11 +/- 7.95 Barium-140 U U U U

-3.67 +/- 6.98 0.826 +/- 5.77 -1.93 +/- 6.68 1.53 +/- 6.07 Cerium-144 U U U U

-0.523 +/- 1.08 -0.278 +/- 0.849 0.727 +/- 1.09 0.346 +/- 0.863 Cesium-134 U U U U

-0.155 +/- 1.03 0.205 +/- 1.67 -0.023 +/- 1.19 0.649 +/- 0.811 Cesium-137 U U U U

-1.53 +/- 4.97 0.317 +/- 0.816 -0.718 +/- 0.96 0.92 +/- 0.767 Cobalt-58 U U U U

-0.177 +/- 1 -1.99 +/- 2.03 -0.338 +/- 0.916 0.168 +/- 0.753 Cobalt-60 U U U U

-0.0267 +/- 2.81 Iodine-131 1 (1) (1) (1)

U 2.06 +/- 2.16 -0.592 +/- 1.81 0.565 +/- 1.95 -0.489 +/- 1.63 Iron-59 U U U U

-2.02 +/- 2.23 0.00665 +/- 2.38 0.913 +/- 1.96 0.0205 +/- 1.51 Lanthanum-140 U U U U

-0.598 +/- 1.42 1.31 +/- 1.33 -0.238 +/- 0.929 0.581 +/- 0.827 Manganese-54 U UI U U 0.842 +/- 1.14 0.186 +/- 0.853 -0.372 +/- 1.44 -0.547 +/- 0.856 Niobium-95 U U U U 0.0957 +/- 2.38 0.837 +/- 1.8 0.931 +/- 1.96 1 +/- 1.64 Zinc-65 U U U U

-0.0184 +/- 1.79 1.9 +/- 1.56 2.54 +/- 1.64 0.642 +/- 1.53 Zirconium-95 U U U U I I-131 analysis not required arcadis.com 69

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Qtr 1 Qtr 2 Qtr 3 Qtr 4 M-43 Imholte Farm (pCi/L) (pCi/L) (pCi/L) (pCi/L)

-3.57 +/- 4.87 -2.23 +/- 7.14 0.665 +/- 5.37 1.68 +/- 4.63 Barium-140 U U U U 0.0956 +/- 7.41 -5.93 +/- 8.98 -0.55 +/- 7.36 0.824 +/- 5.39 Cerium-144 U U U U 0.335 +/- 1.08 0.201 +/- 1.07 -0.119 +/- 1.08 0.556 +/- 0.988 Cesium-134 U U U U 0.07 +/- 1.03 0.347 +/- 1.02 0.591 +/- 1.07 0.118 +/- 0.832 Cesium-137 U U U U

-0.941 +/- 1.18 -0.749 +/- 1.04 -0.0469 +/- 0.979 0.252 +/- 0.811 Cobalt-58 U U U U 1.25 +/- 1.23 0.102 +/- 1.01 0.612 +/- 1.27 0.569 +/- 0.804 Cobalt-60 U U U U 0.727 +/- 1.91 Iodine-131 1 (1) (1) (1)

U 1.42 +/- 1.97 -0.941 +/- 2.14 -0.194 +/- 2.14 0.236 +/- 1.7 Iron-59 U U U U 0.685 +/- 1.88 -0.541 +/- 2.26 0.747 +/- 1.92 -0.69 +/- 1.67 Lanthanum-140 U U U U

-0.418 +/- 0.95 -0.476 +/- 1.08 0.492 +/- 1.01 0.053 +/- 0.799 Manganese-54 U U U U

-0.0978 +/- 1.16 0.32 +/- 0.942 -1.34 +/- 1.89 0.397 +/- 0.901 Niobium-95 U U U U 0.238 +/- 2.27 -1.19 +/- 1.99 1.92 +/- 2.24 -1.68 +/- 1.9 Zinc-65 U U U U 0.238 +/- 1.81 -0.368 +/- 1.79 -0.438 +/- 1.64 -0.374 +/- 1.58 Zirconium-95 U U U U I I-131 analysis not required arcadis.com 70

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Qtr 1 Qtr 2 Qtr 3 Qtr 4 M-55 Hasbrouck Residence (pCi/L) (pCi/L) (pCi/L) (pCi/L)

-3.37 +/- 5.59 3.18 +/- 5.53 4.03 +/- 6.15 -0.308 +/- 5.24 Barium-140 U U U U 6.33 +/- 6.73 -2.43 +/- 5.36 3.07 +/- 5.83 1.95 +/- 6.76 Cerium-144 U U U U 0.0915 +/- 1.06 -1.23 +/- 1.36 -0.657 +/- 0.856 0.105 +/- 0.946 Cesium-134 U U U U

-0.76 +/- 1.07 0.379 +/- 0.927 0.723 +/- 0.945 0.565 +/- 0.942 Cesium-137 U U U U

-1.35 +/- 1.02 -0.302 +/- 0.849 0.116 +/- 0.818 -0.511 +/- 0.922 Cobalt-58 U U U U

-0.025 +/- 1.03 0.172 +/- 0.827 0.558 +/- 1.11 -0.439 +/- 0.902 Cobalt-60 U U U U 0.816 +/- 1.95 Iodine-131 1 (1) (1) (1)

U

-0.537 +/- 2.07 0.0598 +/- 1.95 -1.08 +/- 1.79 -1.23 +/- 1.87 Iron-59 U U U U

-1.78 +/- 1.95 -0.293 +/- 1.86 -0.51 +/- 1.61 -2.78 +/- 3.89 Lanthanum-140 U U U U

-0.135 +/- 1.08 0.677 +/- 1.3 0.153 +/- 1.21 -0.605 +/- 0.952 Manganese-54 U U U U 0.193 +/- 1.07 0.475 +/- 0.864 0.0968 +/- 0.896 -0.285 +/- 1.02 Niobium-95 U U U U 0.354 +/- 2.1 -0.408 +/- 2.07 -0.83 +/- 1.76 -1.39 +/- 1.96 Zinc-65 U U U U 0.0692 +/- 1.85 0.495 +/- 1.56 0.79 +/- 1.43 0.416 +/- 1.76 Zirconium-95 U U U U I I-131 analysis not required arcadis.com 71

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT WATER - DRINKING: GAMMA ISOTOPIC M-14 City of Minneapolis Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 1.470 +/- 2.060 +/- 4.890 +/- 7.600 +/- -0.130 -0.640 6.190 +/- -0.600 +/- 3.830 +/- -3.030 +/- 24.700 +/- -2.090 +/-

Barium-140 11.500 13.900 17.600 28.500 +/- 7.720 +/- 6.900 22.000 63.500 9.790 19.200 52.400 1 13.700 U U U U U U U U U U X U 1.970 +/- 4.210 +/- -1.880 -2.910 +/- -1.110 -5.670 0.460 +/- -3.300 +/- -2.070 3.490 +/- -5.030 +/- 2.180 +/-

Cerium-144 5.340 4.820 +/- 6.000 6.470 +/- 4.680 +/- 5.530 5.410 5.070 +/- 6.990 6.700 11.100 4.960 U U U U U U U U U U U U

-0.415 0.285 +/- -0.932 1.520 +/- 0.117 +/- 0.052 +/- -0.130 0.357 +/- -0.432 -0.891 +/- -2.310 +/- 0.776 +/-

Cesium-134 +/- 0.714 0.761 +/- 0.966 1.510 0.783 0.858 +/- 1.220 1.560 +/- 0.972 0.985 1.900 0.757 U U U U U U U U U U U U 0.042 +/- 1.030 +/- 0.333 +/- -1.120 +/- 0.018 +/- -0.066 0.092 +/- 0.512 +/- 0.068 +/- 0.317 +/- -3.410 +/- 0.550 +/-

Cesium-137 0.720 1.830 0.829 1.840 0.807 +/- 0.780 1.160 1.500 0.971 0.898 2.890 0.701 U U U U U U U U U U U U 0.076 +/- -0.243 -0.389 -0.217 +/- -0.264 0.302 +/- 0.308 +/- 0.842 +/- -0.598 -0.070 +/- -2.410 +/- 0.844 +/-

Cobalt-58 0.774 +/- 0.934 +/- 1.030 1.270 +/- 0.793 0.825 1.260 1.030 +/- 1.050 1.220 2.390 0.844 U U U U U U U U U U U U 0.305 +/- 0.417 +/- -3.080 1.610 +/- 0.045 +/- -0.645 0.095 +/- -0.197 +/- -0.297 0.221 +/- 1.440 +/- -0.119 +/-

Cobalt-60 0.721 0.753 +/- 2.890 1.000 0.802 +/- 0.785 1.150 0.655 +/- 0.912 1.030 1.610 0.720 U U U U U U U U U U U U 0.448 +/- 0.004 +/- 1.350 +/- 0.886 +/- -0.262 -0.304 1.120 +/- -1.080 +/- 1.710 +/- 2.900 +/- -0.247 +/- -1.390 +/-

Iron-59 1.910 2.190 2.790 3.060 +/- 1.800 +/- 2.140 3.470 2.580 2.220 2.650 5.360 2.070 U U U U U U U U U U U U 1.390 +/- -5.480 5.330 +/- -8.150 +/- -1.220 -0.938 -2.220 4.000 +/- -1.610 -1.310 +/- -13.800 +/- -0.533 +/-

Lanthanum-3.850 +/- 4.420 6.420 10.500 +/- 2.450 +/- 2.380 +/- 6.310 11.600 +/- 3.160 7.520 17.800 5.300 140 U U U U U U U U U U U U 0.192 +/- -1.070 -0.378 -0.484 +/- 0.039 +/- -0.563 -0.063 -0.132 +/- -0.181 -0.328 +/- 0.044 +/- 0.482 +/-

Manganese-0.663 +/- 1.550 +/- 0.859 0.940 0.679 +/- 0.793 +/- 1.720 0.713 +/- 0.955 0.873 1.790 0.712 54 U U U U U U U U U U U U 1.630 +/- 0.154 +/- 0.521 +/- 0.413 +/- 1.360 +/- 0.177 +/- 0.636 +/- 0.120 +/- -0.276 -2.020 +/- -0.544 +/- -0.956 +/-

Niobium-95 1.730 0.965 1.180 1.380 1.390 0.944 1.290 1.110 +/- 1.070 2.840 2.270 1.600 UI U U U UI U U U U U U U 0.553 +/- -0.017 0.831 +/- 0.142 +/- 1.870 +/- 0.196 +/- -1.230 -0.183 +/- 1.990 +/- -0.478 +/- -1.490 +/- 0.513 +/-

Zinc-65 1.550 +/- 1.490 1.950 1.980 1.670 1.710 +/- 2.330 1.630 2.180 2.240 3.530 1.610 U U U U U U U U U U U U

-0.369 0.603 +/- -1.070 0.101 +/- 0.135 +/- 0.971 +/- 0.853 +/- 1.160 +/- 0.795 +/- 1.750 +/- 0.552 +/- 0.280 +/-

Zirconium-95 +/- 1.560 1.520 +/- 2.280 2.220 1.430 1.660 2.390 1.990 1.920 2.050 4.350 1.630 U U U U U U U U U U U U 1 Positive Ba-140 results were due to analytical deviations rather than actual detection of plant related material. La-140 was not detected in any of the water samples. In some cases, the required LLD was not met for Ba-La-140. See Section 7.5 for further details.

arcadis.com 72

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT WATER - SURFACE: GAMMA ISOTOPIC M-8 Upstream of plant pCi/L Jan1 Feb1 Mar1 Apr May Jun Jul Aug Sep Oct Nov2 Dec1 6.790 +/- 7.840 +/- -0.517 +/- 1.880 +/- 54.800 +/- 1.680 +/- -21.400 46.200 +/-

Barium-140 - - - 29.700 8.230 7.030 11.600 47.600 3 11.600 +/- 19.400 47.100 3 -

U U U U X U U 6.280 +/- 2.980 +/- 2.720 +/- 2.240 +/- -0.913 +/- -3.060 +/- 0.495 +/- 0.972 +/-

Cerium-144 - - - 7.600 6.130 5.610 5.720 5.740 7.270 6.310 5.180 -

U U U U U U U U

-0.989 +/- -0.331 +/- -0.413 +/- 0.316 +/- 0.443 +/- -1.370 +/- 0.450 +/- 0.802 +/-

Cesium-134 - - - 1.440 0.830 0.870 0.891 0.962 1.060 0.935 0.801 -

U U U U U U U U 0.158 +/- 0.492 +/- 0.596 +/- -0.342 +/- 1.310 +/- 0.053 +/- 1.300 +/- -0.063 +/-

Cesium-137 - - - 0.786 0.851 0.861 0.826 0.810 0.979 1.520 0.755 -

U U U U U U U U 0.302 +/- 0.118 +/- 0.544 +/- -0.580 +/- -0.903 +/- 0.725 +/- 0.473 +/- 0.395 +/-

Cobalt-58 - - - 1.140 1.270 0.875 0.893 1.190 1.210 1.090 1.080 -

U U U U U U U U 0.229 +/- 0.294 +/- -0.436 +/- 0.403 +/- 0.973 +/- -0.642 +/- 1.340 +/- 0.147 +/-

Cobalt-60 - - - 0.965 0.901 0.970 0.807 0.868 1.760 0.910 0.844 -

U U U U U U U U

-1.820 +/- 3.410 +/- -1.550 +/- -1.710 +/- -2.440 +/- -1.230 +/- 0.448 +/- -0.446 +/-

Iron-59 - - - 3.060 5.190 2.190 5.270 3.610 3.170 2.770 3.050 -

U U U U U U U U

-1.950 +/- -0.874 +/- -1.280 +/- 2.060 +/- 1.400 +/- -0.395 +/- -3.650 +/- -2.010 +/-

Lanthanum-

- - - 9.320 2.770 2.390 3.790 14.700 3.740 6.950 16.700 -

140 U U U U U U U U 0.875 +/- 0.897 +/- -0.323 +/- 0.102 +/- -0.358 +/- 0.468 +/- 0.344 +/- -0.388 +/-

Manganese-

- - - 0.887 1.340 0.835 0.792 0.835 0.973 0.897 1.340 -

54 U U U U U U U U 0.937 +/- 0.491 +/- -0.648 +/- -0.228 +/- 2.470 +/- -0.643 +/- 0.400 +/- -2.070 +/-

Niobium-95 - - - 2.300 1.040 0.943 0.990 2.450 1.140 1.100 2.210 -

U U U U UI U U U

-0.703 +/- 1.120 +/- -1.900 +/- 0.913 +/- 0.116 +/- -0.510 +/- 1.860 +/- -0.056 +/-

Zinc-65 - - - 2.030 1.980 2.240 1.700 2.150 2.530 2.800 1.980 -

U U U U U U U U 2.240 +/- 0.022 +/- -0.188 +/- -1.140 +/- 1.680 +/- -0.484 +/- -1.090 +/- -0.983 +/-

Zirconium-95 - - - 2.160 1.610 1.530 1.660 2.350 1.980 2.150 2.100 -

U U U U U U U U Notes:

1 Sample unavailable because unsafe condition for sampling due to river surface being frozen.

2 Sample collection November 1 - 6th, 2019, sample unavailable because river surface was frozen.

3 Positive Ba-140 results were due to analytical deviations rather than actual detection of plant related material. La-140 was not detected in any of the water samples. In some cases, the required LLD was not met for Ba-La-140. See Section 7.5 for further details.

arcadis.com 73

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT M-9 Downstream of plant pCi/L Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 5.660 +/- -5.260 +/- 1.020 +/- 28.50 +/- 3.200 +/- 1.450 +/- -0.551 +/- 28.400 +/- 5.140 +/- 0.688 +/- -0.400 +/- -1.950 +/-

Barium-140 10.300 27.900 16.400 26.30 14.40 6.670 10.200 38.700 1 12.600 13.600 16.100 14.800 U U U U U U U X U U U U

-2.250 +/- 0.468 +/- 0.818 +/- 0.171 +/- 8.660 +/- 1.810 +/- 2.690 +/- 1.830 +/- 2.290 +/- 2.830 +/- 0.865 +/- -2.100 +/-

Cerium-144 4.850 5.180 5.230 5.770 7.730 5.480 4.820 6.800 7.290 4.550 4.980 6.220 U U U U UI U U U U U U U 0.081 +/- 0.241 +/- 1.360 +/- 1.380 +/- 0.005 +/- 0.485 +/- -0.454 +/- -0.053 +/- -0.081 +/- 0.308 +/- 0.688 +/- 0.985 +/-

Cesium-134 0.757 0.802 0.964 1.060 0.912 0.885 1.590 0.955 1.300 0.718 0.860 0.979 U U U U U U U U U U U U

-0.504 +/- 1.190 +/- -0.142 +/- 0.425 +/- 0.360 +/- 0.091 +/- 0.252 +/- -1.100 +/- 0.866 +/- -0.073 +/- 1.610 +/- -0.051 +/-

Cesium-137 0.715 1.340 0.830 0.832 0.831 0.867 0.765 1.810 1.170 0.681 1.060 0.829 U UI U U U U U U U U UI U

-0.839 +/- -0.539 +/- -0.607 +/- -1.010 +/- -0.166 +/- -0.046 +/- 0.512 +/- -0.240 +/- -0.100 +/- -0.200 +/- -0.266 +/- -0.822 +/-

Cobalt-58 0.835 0.875 1.060 1.160 0.907 0.918 1.410 1.230 1.340 0.838 0.880 1.080 U U U U U U U U U U U U

-0.252 +/- -0.195 +/- 0.141 +/- 0.556 +/- -0.237 +/- 0.971 +/- -0.227 +/- -1.320 +/- -0.913 +/- 0.185 +/- 0.376 +/- -0.220 +/-

Cobalt-60 0.727 0.804 0.987 0.939 0.901 0.830 0.790 1.040 1.080 0.681 0.770 0.757 U U U U U U U U U U U U 0.781 +/- 0.881 +/- -0.552 +/- 2.080 +/- 0.729 +/- 0.133 +/- -0.983 +/- 1.230 +/- -0.433 +/- -2.340 +/- 1.270 +/- 3.370 +/-

Iron-59 1.960 1.990 3.160 2.960 2.080 1.910 2.390 3.580 2.970 2.050 2.390 3.110 U U U U U U U U U U U UI

-2.940 +/- -2.930 +/- 0.403 +/- -2.990 +/- -0.935 +/- -1.720 +/- -2.540 +/- -11.700 0.437 +/- 2.080 +/- -4.640 +/- -0.766 +/-

Lanthanum-3.960 5.080 6.770 9.960 2.940 2.210 3.440 +/- 13.300 4.860 4.810 5.260 5.370 140 U U U U U U U U U U U U 0.041 +/- -0.344 +/- 0.083 +/- -0.044 +/- 0.388 +/- 0.164 +/- 0.718 +/- -0.467 +/- -1.470 +/- 0.177 +/- -0.657 +/- -0.070 +/-

Manganese-0.669 0.651 0.945 0.864 0.798 0.891 0.745 0.924 1.720 0.785 0.738 0.855 54 U U U U U U U U U U U U

-1.340 +/- -1.660 +/- 0.427 +/- 0.506 +/- -0.436 +/- 1.170 +/- 0.981 +/- 1.310 +/- -0.197 +/- -0.127 +/- -0.728 +/- -0.102 +/-

Niobium-95 1.540 1.530 1.150 1.230 0.980 1.190 0.917 1.390 1.350 0.884 1.000 1.080 U U U U U U U U U U U U 0.296 +/- 0.553 +/- 0.843 +/- -0.611 +/- -0.186 +/- -0.262 +/- -0.642 +/- -2.640 +/- -2.560 +/- -1.710 +/- -0.762 +/- -0.083 +/-

Zinc-65 1.510 1.650 2.130 2.030 1.930 1.620 1.880 3.800 2.580 1.590 1.780 1.930 U U U U U U U U U U U U 0.158 +/- 0.964 +/- 2.710 +/- -0.720 +/- -1.480 +/- 2.470 +/- 0.237 +/- -0.063 +/- 1.010 +/- 0.357 +/- -0.252 +/- -1.350 +/-

Zirconium-95 1.450 1.650 2.480 2.140 1.680 2.520 1.570 2.420 2.370 1.500 1.720 1.890 U U U U U U U U U U U U 1 Positive Ba-140 results were due to analytical deviations rather than actual detection of plant related material. La-140 was not detected in any of the water samples. In some cases, the required LLD was not met for Ba-La-140. See Section 7.5 for further details.

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2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT Data below was analyzed Environmental Dosimetry Company (EDC). The results reported relate only to the items tested and to the sample as received by the laboratory. The raw TLD results are corrected for individual element sensitivity and reader sensitivity and determined by QC results. Transit exposures are subtracted and the fade of the thermoluminescent response is compensated. Abbreviations ISFSI Independent Spent Fuel Storage Installation TLD Thermoluminescent Dosimeter mR/Std. Qtr Millirem per standard quarter (91 days) arcadis.com 75

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT DIRECT RADIATION - TLD: GAMMA mrem/91 day Qtr 1 Qtr 2 Qtr 3 Qtr 4 Control M01C Kirchenbauer Farm 12.6 +/- 0.7 11.8 +/- 0.9 14.4 +/- 0.8 12.9 +/- 0.7 M02C Cty Rd 4 & 15 12.1 +/- 0.6 (1) 13.5 +/- 0.6 12.0 +/- 0.6 M03C Cty Rd 19 & Jason Ave 13.0 +/- 0.6 13.9 +/- 0.9 14.9 +/- 0.8 12.9 +/- 0.6 M04C Maple Lake Water Tower 13.4 +/- 1.0 12.9 +/- 1.0 14.2 +/- 0.7 12.6 +/- 0.8 Inner M01A Sherburne Ave. So. 13.5 +/- 0.6 13.6 +/- 0.9 15.2 +/- 0.8 13.8 +/- 0.9 M02A Sherburne Ave. So. 13.7 +/- 0.7 13.3 +/- 1.0 15.5 +/- 0.8 (2)

M03A Sherburne Ave. So. 11.7 +/- 0.6 14.3 +/- 1.2 14.7 +/- 0.8 12.9 +/- 0.6 M04A Biology Station Rd. 12.8 +/- 0.7 12.3 +/- 0.8 14.7 +/- 1.0 13.1 +/- 0.9 M05A Biology Station Rd. 12.3 +/- 0.8 12.1 +/- 0.9 14.7 +/- 0.9 13.6 +/- 0.8 M06A Biology Station Rd. 13.3 +/- 0.7 13.7 +/- 1.1 15.6 +/- 1.0 14.2 +/- 0.9 M07A Parking Lot H 12.6 +/- 0.6 13.1 +/- 1.0 15.1 +/- 0.8 13.9 +/- 0.9 M08A Parking Lot F 12.6 +/- 0.6 13.8 +/- 1.1 15.1 +/- 0.7 14.4 +/- 0.8 M09A County Road 75 13.2 +/- 0.7 13.7 +/- 1.1 15.5 +/- 1.0 14.1 +/- 0.9 M10A County Road 75 12.8 +/- 0.7 12.5 +/- 1.0 14.1 +/- 1.0 13.8 +/- 0.8 M11A County Road 75 13.8 +/- 0.8 14.2 +/- 0.9 15.9 +/- 0.7 14.4 +/- 0.9 M12A County Road 75 13.3 +/- 0.6 13.1 +/- 0.8 14.8 +/- 0.7 14.1 +/- 0.7 M13A North Boundary Rd. 13.1 +/- 0.8 13.7 +/- 1.0 15.1 +/- 0.7 13.7 +/- 0.6 M14A North Boundary Rd. 12.2 +/- 0.8 13.8 +/- 0.9 16.1 +/- 0.8 14.1 +/- 0.8 Outer M01B 117th Street 12.5 +/- 0.7 12.6 +/- 0.9 14.4 +/- 0.8 13.4 +/- 0.9 M02B County Road 11 13.4 +/- 0.9 13.2 +/- 1.0 15.6 +/- 1.0 14.2 +/- 0.8 M03B County Rd. 73 & 81 11.1 +/- 0.7 10.3 +/- 0.8 13.2 +/- 0.7 11.5 +/- 0.6 M04B County Rd. 73 (196th Street) 11.9 +/- 0.7 12.8 +/- 0.8 14.5 +/- 1.0 12.9 +/- 0.7 M05B City of Big Lake 13.2 +/- 0.8 15.0 +/- 1.1 14.8 +/- 0.9 13.8 +/- 0.9 M06B County Rd 14 & 196th Street 11.0 +/- 0.6 13.7 +/- 1.0 15.1 +/- 0.7 13.2 +/- 0.8 M07B Monticello Industrial Dr. 13.5 +/- 0.6 13.6 +/- 0.9 14.8 +/- 0.6 14.2 +/- 0.7 M08B Residence Hwy 25 & Davidson Ave 13.3 +/- 0.6 12.7 +/- 0.9 13.5 +/- 0.7 12.9 +/- 0.7 M09B Weinand Farm 13.3 +/- 0.9 14.7 +/- 1.1 15.5 +/- 0.9 15.0 +/- 1.0 M10B Reisewitz Farm - Acacia Ave 12.4 +/- 0.7 13.3 +/- 0.9 14.9 +/- 0.7 13.7 +/- 0.6 arcadis.com 76

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT mrem/91 day Qtr 1 Qtr 2 Qtr 3 Qtr 4 M11B Vanlith Farm - 97th Ave 13.1 +/- 0.8 14.4 +/- 1.2 15.2 +/- 1.2 14.8 +/- 0.9 M12B Lake Maria St. Park 12.8 +/- 0.7 (3) 15.1 +/- 0.9 14.1 +/- 0.8 M13B Bridgewater Sta. 13.8 +/- 0.8 13.1 +/- 1.0 14.8 +/- 0.9 14.0 +/- 0.9 M14B Anderson Res. - Cty Rd 111 14.3 +/- 0.9 15.9 +/- 1.1 16.0 +/- 0.8 15.8 +/- 0.8 M15B Red Oak Wild Bird Farm (4) 13.2 +/- 0.9 14.0 +/- 0.9 13.9 +/- 0.9 M16B University Ave and Hancock St, Becker 13.1 +/- 0.5 12.3 +/- 1.0 14.1 +/- 0.9 13.4 +/- 0.9 Special Interest I-11 OCA Fence South, on exit road 13.6 +/- 0.6 13.7 +/- 1.0 14.9 +/- 0.7 14.3 +/- 0.7 I-12 OCA Fence Middle, on exit road 13.1 +/- 0.5 13.8 +/- 0.9 14.7 +/- 0.9 14.8 +/- 0.7 I-13 OCA Fence North, on exit road 15.0 +/- 1.0 13.4 +/- 1.0 15.2 +/- 0.9 15.1 +/- 0.7 M01S 127th St. NE 11.6 +/- 0.9 10.6 +/- 0.8 12.9 +/- 0.6 11.4 +/- 1.0 M02S Krone Residence 12.8 +/- 0.8 11.9 +/- 0.8 13.0 +/- 1.0 12.1 +/- 0.8 M03S Big Oaks Park 13.2 +/- 0.8 13.4 +/- 0.9 15.2 +/- 0.9 13.9 +/- 0.9 M04S Pinewood School 13.9 +/- 0.9 13.8 +/- 1.0 15.4 +/- 0.7 15.0 +/- 0.8 M05S 20500 Co. Rd 11, Big Lake 13.6 +/- 0.8 13.5 +/- 0.9 14.9 +/- 0.9 13.3 +/- 0.9 M06S Monticello Public Works 14.7 +/- 0.7 13.8 +/- 1.1 15.9 +/- 0.6 15.0 +/- 1.1 Notes:

1 TLD was damaged by lawn mowing equipment. (Condition Report 501000029403) 2 TLD was missing in the field. (Condition Report 501000036267) 3 TLD was missing in the field. (Condition Report 501000029403) 4 TLD was missing in the field. (Condition Report 501000025016) arcadis.com 77

2019 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT MONTICELLO NUCLEAR GENERATING PLANT DIRECT RADIATION - ISFSI: GAMMA mrem/91 day Type Qtr1 Qtr2 Qtr3 Qtr4 I-01 NE corner of ISFSI Gamma 38.1 +/- 2.3 35.0 +/- 2.3 41.5 +/- 2.0 40.3 +/- 4.1 I-02 North side of ISFSI, center Gamma 34.0 +/- 2.1 31.7 +/- 2.3 34.0 +/- 2.3 37.0 +/- 2.1 I-03 NW corner of ISFSI Gamma 31.5 +/- 1.6 30.2 +/- 3.7 32.1 +/- 2.1 32.2 +/- 2.3 I-04 West side of ISFSI, middle Gamma 86.3 +/- 12.9 86.7 +/- 8.1 82.0 +/- 6.2 103.7 +/- 19.3 I-05 West side of ISFSI, at center of array Gamma 52.4 +/- 2.3 57.6 +/- 4.6 54.6 +/- 5.6 56.9 +/- 4.5 I-06 SW corner of ISFSI Gamma 29.7 +/- 1.0 28.6 +/- 2.5 30.3 +/- 2.1 34.3 +/- 3.9 I-07 South side of ISFSI, center Gamma 34.2 +/- 3.3 32.4 +/- 3.5 33.4 +/- 2.2 34.7 +/- 3.6 I-08 SE corner of ISFSI Gamma 33.5 +/- 3.0 32.8 +/- 2.3 33.5 +/- 3.6 32.2 +/- 2.4 I-09 East side of ISFSI, at center of array Gamma 64.8 +/- 3.6 69.3 +/- 5.0 61.2 +/- 4.7 68.7 +/- 5.9 I-10 East side of ISFSI, middle Gamma 81.3 +/- 4.7 94.9 +/- 13.4 84.4 +/- 5.2 90.1 +/- 7.2 arcadis.com 78

APPENDIX A GEL 2019 ANNUAL ENVIRONMENTAL QA REPORT

2019 ANNUAL QUALITY ASSURANCE REPORT FOR THE RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM (REMP)

2019 ANNUAL QUALITY ASSURANCE REPORT FOR THE RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM (REMP)

Approved By February 28, 2020 Robert L. Pullano Date Director, Quality Systems Page 2 of 52

TABLE OF CONTENTS

1. INTRODUCTION ........................................................................................................................ 5

2. QUALITY ASSURANCE PROGRAMS FOR INTER-LABORATORY, INTRA-LABORATORY AND THIRD PARTY CROSS-CHECK ............................................................................................... 5

3. QUALITY ASSURANCE PROGRAM FOR INTERNAL AND EXTERNAL AUDITS .................. 7

4. PERFORMANCE EVALUATION ACCEPTANCE CRITERIA FOR ENVIRONMENTAL SAMPLE ANALYSIS ................................................................................................................................. 7

5. PERFORMANCE EVALUATION SAMPLES ............................................................................. 7

6. QUALITY CONTROL PROGRAM FOR ENVIRONMENTAL SAMPLE ANALYSIS .................. 8

7.

SUMMARY

OF DATA RESULTS ............................................................................................... 9

8.

SUMMARY

OF PARTICIPATION IN THE ECKERT & ZIEGLER ANALYTICS ENVIRONMENTAL CROSS-CHECK PROGRAM .................................................................................................... 9

9.

SUMMARY

OF PARTICIPATION IN THE MAPEP MONITORING PROGRAM ....................... 9

10.

SUMMARY

OF PARTICIPATION IN THE ERA MRAD PT PROGRAM .................................. 9

11.

SUMMARY

OF PARTICIPATION IN THE ERA PT PROGRAM.............................................. 9

12. CORRECTIVE ACTION REQUEST AND REPORT (CARR) ................................................ 10

13. REFERENCES ....................................................................................................................... 11 TABLES Table 1 2019 Radiological Proficiency Testing Results and Acceptance Criteria ..................... 12 Table 2 2019 Eckert & Ziegler Analytics Performance Evaluation Results ............................... 23 Table 3 2019 DOE Mixed Analyte Performance Evaluation Program (MAPEP) Results ......... 23 Table 4 2019 ERA Program Performance Evaluation Results .................................................. 26 Table 5 2019 ERA Program (MRAD) Performance Evaluation Results .................................... 27 Table 6 REMP Intra-Laboratory Data Summary: Bias and Precision By Matrix...40 Table 7 All Radiological Intra-Laboratory Data Summary: Bias and Precision By Matrix....42 Table 8 2019 Corrective Action Report Summary.......48 Page 3 of 52

TABLE OF CONTENTS (CONTINUED)

FIGURES Figure 1 Cobalt-60 Performance Evaluation Results and % Bias ........................................... 31 Figure 2 Cesium-137 Performance Evaluation Results and % Bias ....................................... 32 Figure 3 Tritium Performance Evaluation Results and % Bias ................................................ 33 Figure 4 Strontium-90 Performance Evaluation Results and % Bias ....................................... 34 Figure 5 Gross Alpha Performance Evaluation Results and % Bias ........................................ 35 Figure 6 Gross Beta Performance Evaluation Results and % Bias ......................................... 36 Figure 7 Iodine-131 Performance Evaluation Results and % Bias .......................................... 37 Figure 8 Americium-241 Performance Evaluation Results and % Bias ................................... 38 Figure 9 Plutonium-238 Performance Evaluation Results and % Bias .................................... 39 Page 4 of 52

2019 ANNUAL QUALITY ASSURANCE REPORT FOR THE RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM (REMP)

1. Introduction GEL Laboratories, LLC (GEL) is a privately owned environmental laboratory dedicated to providing personalized client services of the highest quality. GEL was established as an analytical testing laboratory in 1981. Now a full service lab, our analytical divisions use state of the art equipment and methods to provide a comprehensive array of organic, inorganic, and radiochemical analyses to meet the needs of our clients.

At GEL, quality is emphasized at every level of personnel throughout the company.

Managements ongoing commitment to good professional practice and to the quality of our testing services to our customers is demonstrated by their dedication of personnel and resources to develop, implement, assess, and improve our technical and management operations.

The purpose of GELs quality assurance program is to establish policies, procedures, and processes to meet or exceed the expectations of our clients. To achieve this, all personnel that support these services to our clients are introduced to the program and policies during their initial orientation, and annually thereafter during company-wide training sessions.

GELs primary goals are to ensure that all measurement data generated are scientifically and legally defensible, of known and acceptable quality per the data quality objectives (DQOs), and thoroughly documented to provide sound support for environmental decisions. In addition, GEL continues to ensure compliance with all contractual requirements, environmental standards, and regulations established by local, state and federal authorities.

GEL administers the QA program in accordance with the Quality Assurance Plan, GL-QS-B-001. Our Quality Systems include all quality assurance (QA) policies and quality control (QC) procedures necessary to plan, implement, and assess the work we perform. GELs QA Program establishes a quality management system (QMS) that governs all of the activities of our organization.

This report entails the quality assurance program for the proficiency testing and environmental monitoring aspects of GEL for 2019. GELs QA Program is designed to monitor the quality of analytical processing associated with environmental, radiobioassay, effluent (10 CFR Part 50), and waste (10 CFR Part 61) sample analysis.

This report covers the category of Radiological Environmental Monitoring Program (REMP) and includes:

Intra-laboratory QC results analyzed during 2019.

Inter-laboratory QC results analyzed during 2019 where known values are available.

2. Quality Assurance Programs for Inter-laboratory, Intra-laboratory and Third Party Cross-Check In addition to internal and client audits, our laboratory participates in annual performance evaluation studies conducted by independent providers. We routinely participate in the following types of performance audits:

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Proficiency testing and other inter-laboratory comparisons Performance requirements necessary to retain Certifications Evaluation of recoveries of certified reference and in-house secondary reference materials using statistical process control data.

Evaluation of relative percent difference between measurements through SPC data.

We also participate in a number of proficiency testing programs for federal and state agencies and as required by contracts. It is our policy that no proficiency evaluation samples be analyzed in any special manner. Our annual performance evaluation participation generally includes a combination of studies that support the following:

US Environmental Protection Agency Discharge Monitoring Report, Quality Assurance Program (DMR-QA). Annual national program sponsored by EPA for laboratories engaged in the analysis of samples associated with the NPDES monitoring program.

Participation is mandatory for all holders of NPDES permits. The permit holder must analyze for all of the parameters listed on the discharge permit. Parameters include general chemistry, metals, BOD/COD, oil and grease, ammonia, nitrates, etc.

Department of Energy Mixed Analyte Performance Evaluation Program (MAPEP). A semiannual program developed by DOE in support of DOE contractors performing waste analyses. Participation is required for all laboratories that perform environmental analytical measurements in support of environmental management activities. This program includes radioactive isotopes in water, soil, vegetation and air filters.

ERAs MRAD-Multimedia Radiochemistry Proficiency test program. This program is for labs seeking certification for radionuclides in wastewater and solid waste. The program is conducted in strict compliance with USEPA National Standards for Water Proficiency study.

ERAs InterLaB RadCheM Proficiency Testing Program for radiological analyses. This program completes the process of replacing the USEPA EMSL-LV Nuclear Radiation Assessment Division program discontinued in 1998. Laboratories seeking certification for radionuclide analysis in drinking water also use the study. This program is conducted in strict compliance with the USEPA National Standards for Water Proficiency Testing Studies. This program encompasses Uranium by EPA method 200.8 (for drinking water certification in Utah/Primary NELAP), gamma emitters, Gross Alpha/Beta, Iodine-131, naturally occurring radioactive isotopes, Strontium-89/90, and Tritium.

ERAs Water Pollution (WP) biannual program for waste methodologies includes parameters for both organic and inorganic analytes.

ERAs Water Supply (WS) biannual program for drinking water methodologies includes parameters for organic and inorganic analytes.

Environmental Cross-Check Program administered by Eckert & Ziegler Analytics, Inc.

This program encompasses radionuclides in water, soil, milk, naturally occurring radioactive isotopes in soil and air filters.

GEL procures single-blind performance evaluation samples from Eckert & Ziegler Analytics to verify the analysis of sample matrices processed at GEL. Samples are received on a quarterly basis. GELs Third-Party Cross-Check Program provides environmental matrices encountered in a typical nuclear utility REMP. The Third-Party Cross-Check Program is intended to meet or exceed the inter-laboratory comparison program requirements Page 6 of 52

discussed in NRC Regulatory Guide 4.15. Once performance evaluation samples have been prepared in accordance with the instructions provided by the PT provider, samples are managed and analyzed in the same manner as environmental samples from GELs clients.

3. Quality Assurance Program for Internal and External Audits During each annual reporting period, at least one internal assessment of each area of the laboratory is conducted in accordance with the pre-established schedule from Standard Operating Procedure for the Conduct of Quality Audits, GL-QS-E-001. The annual internal audit plan is reviewed for adequacy and includes the scheduled frequency and scope of quality control actions necessary to GELs QA program. Internal audits are conducted at least annually in accordance with a schedule approved by the Quality Systems Director.

Supplier audits are contingent upon the categorization of the supplier, and may or may not be conducted prior to the use of a supplier or subcontractor. Type I suppliers and subcontractors, regardless of how they were initially qualified, are re-evaluated at least once every three years.

In addition, prospective customers audit GEL during pre-contract audits. GEL hosts several external audits each year for both our clients and other programs. These programs include environmental monitoring, waste characterization, and radiobioassay. The following list of programs may audit GEL at least annually or up to every three years depending on the program.

TNI, The NELAC Institute, National Environmental Laboratory Accreditation Program DOECAP, U.S. Department of Energy Consolidated Audit Program DOELAP, U.S. Department of Energy Laboratory Accreditation Program DOE QSAS, U.S. Department of Energy, Quality Systems for Analytical Services ISO/IEC 17025:2005 A2LA, American Association for Laboratory Accreditation DoD ELAP, US Department of Defense Environmental Accreditation Program NUPIC, Nuclear Procurement Issues Committee South Carolina Department of Health and Environmental Control (SC DHEC)

The annual radiochemistry laboratory internal audit (19-RAD-001) was conducted in July and August, 2019. There were no findings or observations and four noteworthy improvements from this assessment.

4. Performance Evaluation Acceptance Criteria for Environmental Sample Analysis GEL utilized an acceptance protocol based upon two performance models. For those inter-laboratory programs that already have established performance criteria for bias (i.e.,

MAPEP, and ERA/ELAP), GEL will utilize the criteria for the specific program. For intra-laboratory or third party quality control programs that do not have a specific acceptance criteria (i.e. the Eckert-Ziegler Analytics Environmental Cross-check Program), results will be evaluated in accordance with GELs internal acceptance criteria.

5. Performance Evaluation Samples Performance Evaluation (PE) results and internal quality control sample results are evaluated in accordance with GEL acceptance criteria. The first criterion concerns bias, which is defined as the deviation of any one result from the known value. The second criterion concerns precision, which deals with the ability of the measurement to be replicated by comparison of an individual result with the mean of all results for a given sample set.

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At GEL, we also evaluate our analytical performance on a regular basis through statistical process control (SPC) acceptance criteria. Where feasible, this criterion is applied to both measures of precision and accuracy and is specific to sample matrix. We establish environmental process control limits at least annually.

For Radiochemistry analysis, quality control evaluation is based on static limits rather than those that are statistically derived. Our current process control limits are maintained in GELs AlphaLIMS. We also measure precision with matrix duplicates and/or matrix spike duplicates. The upper and lower control limits (UCL and LCL respectively) for precision are plus or minus three times the standard deviation from the mean of a series of relative percent differences. The static precision criteria for radiochemical analyses are 0 - 20%,

for activity levels exceeding the contract required detection limit (CRDL).

6. Quality Control Program for Environmental Sample Analysis GELs internal QA Program is designed to include QC functions such as instrumentation calibration checks (to insure proper instrument response), blank samples, instrumentation backgrounds, duplicates, as well as overall staff qualification analyses and statistical process controls. Both quality control and qualification analyses samples are used to be as similar as the matrix type of those samples submitted for analysis by the various laboratory clients. These performance test samples (or performance evaluation samples) are either actual sample submitted in duplicate in order to evaluate the precision of laboratory measurements, or fortified blank samples, which have been given a known quantity of a radioisotope that is in the interest to GELs clients.

Accuracy (or Bias) is measured through laboratory control samples and/or matrix spikes, as well as surrogates and internal standards. The UCLs and LCLs for accuracy are plus or minus three times the standard deviation from the mean of a series of recoveries. The static limit for most radiochemical analyses is 75 - 125%. Specific instructions for out-of-control situations are provided in the applicable analytical SOP.

GELs Laboratory Control Standard (LCS) is an aliquot of reagent water or other blank matrix to which known quantities of the method analytes are added in the laboratory. The LCS is analyzed exactly like a sample, and its purpose is to determine whether the methodology is in control, and whether the laboratory is capable of making accurate and precise measurements. Some methods may refer to these samples as Laboratory Fortified Blanks (LFB). The requirement for recovery is between 75% and 125% for radiological analyses excluding drinking water matrix.

Bias (%) = (observed concentration)

• 100 %

(known concentration)

Precision is a data quality indicator of the agreement between measurements of the same property, obtained under similar conditions, and how well they conform to themselves.

Precision is usually expressed as standard deviation, variance or range in either absolute or relative (percentage) terms.

GELs laboratory duplicate (DUP or LCSD) is an aliquot of a sample taken from the same container and processed in the same manner under identical laboratory conditions. The aliquot is analyzed independently from the parent sample and the results are compared to measure precision and accuracy.

If a sample duplicate is analyzed, it will be reported as Relative Percent Difference (RPD).

The RPD must be 20 percent or less, if both samples are greater than 5 times the MDC. If both results are less than 5 times MDC, then the RPD must be equal to or less than 100%.

If one result is above the MDC and the other is below the MDC, then the RPD can be calculated using the MDC for the result of the one below the MDC. The RPD must be 100%

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or less. In the situation where both results are above the MDC but one result is greater than 5 times the MDC and the other is less than 5 times the MDC, the RPD must be less than or equal to 20%. If both results are below MDC, then the limits on % RPD are not applicable.

Difference (%) = (high duplicate result - low duplicate result)

• 100 %

(average of results)

7. Summary of Data Results During 2019, forty-five (45) radioisotopes associated with seven (7) matrix types were analyzed under GELs Performance Evaluation program in participation with ERA, MAPEP, and Eckert & Ziegler Analytics. Matrix types were representative of client analyses performed during 2019. Of the four hundred twenty-five (425) total results, 97.2% (413 of 425) were found to be acceptable within the PT providers three sigma or other statistical criteria. The list below contains the type of matrix evaluated by GEL.

Air Filter Cartridge Water Milk Soil Liquid Vegetation Graphs are provided in Figures 1-9 of this report to allow for the evaluation of trends or biases. These graphs include radioisotopes Cobalt-60, Cesium-137, Tritium, Strontium-90, Gross Alpha, Gross Beta, Iodine-131, Americium-241, and Plutonium-238.

8. Summary of Participation in the Eckert & Ziegler Analytics Environmental Cross-Check Program Eckert & Ziegler Analytics provided samples for eighty-nine (89) individual environmental analyses. The accuracy of each result reported to Eckert & Ziegler Analytics, Inc. is measured by the ratio of GELs result to the known value. All results fell within GELs acceptance criteria (100% within acceptance).

9. Summary of Participation in the MAPEP Monitoring Program MAPEP Series 40 and 41 were analyzed by the laboratory. Of the one hundred twenty-eight (128) analyses, 98% (126 out of 128) fell within the PT providers acceptance criteria.

10. Summary of Participation in the ERA MRaD PT Program The ERA MRad program provided samples (MRAD-30 and MRAD-31) for one hundred sixty-six (166) individual environmental analyses. Of the 166 analyses, 96% (160 out of 166) fell within the PT providers acceptance criteria.

11. Summary of Participation in the ERA PT Program The ERA program provided samples (RAD-116, RAD-117, RAD-118, and 9116) for forty-two (42) individual environmental analyses. Of the 42 analyses, 90% (38 out of 42) fell within the PT providers acceptance criteria.

All corrective actions are summarized in Table 8.

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12. Corrective Action Request and Report (CARR)

There are two categories of corrective action at GEL. One is corrective action implemented at the analytical and data review level in accordance with the analytical SOP. The other is formal corrective action documented by the Quality Systems Team in accordance with GL-QS-E-002. A formal corrective action is initiated when a nonconformance reoccurs or is so significant that permanent elimination or prevention of the problem is required. Formal corrective action investigations include root cause analysis.

GEL includes quality requirements in most analytical standard operating procedures to ensure that data are reported only if the quality control criteria are met or the quality control measures that did not meet the acceptance criteria are documented. A formal corrective action is implemented according to GL-QS-E-002 for Conducting Corrective/Preventive Action and Identifying Opportunities for Improvement. Recording and documentation is performed following guidelines stated in GL-QS-E-012 for Client NCR Database Operation.

Any employee at GEL can identify and report a nonconformance and request that corrective action be taken. Any GEL employee can participate on a corrective action team as requested by the QS team or Group Leaders. The steps for conducting corrective action are detailed in GL-QS-E-002. In the event that correctness or validity of the laboratorys test results in doubt, the laboratory will take corrective action. If investigations show that the results have been impacted, affected clients will be informed of the issue in writing within five (5) calendar days of the discovery.

CARR190225-1192 documents the unacceptable result of Strontium-89 of ERA Study 116 CARR190530-1211 documents the unacceptable results of Uranium-238, Uranium-238, Uranium-Mass and Plutonium-238 in vegetation and Uranium-238 in soil of ERA MRAD-30 CARR 190603-1212 documents the unacceptable result of Iron-55 in soil of MAPEP-40, CARR 190826-1250 documents the unacceptable result of Strontium-89 and Gross Alpha of RAD-118 CARR 191212-1262 documents the unacceptable result of Lead-212 of MRAD-31 CARR 191213-1265 documents the unacceptable result of Radium-226 of MAPEP-41 Table 8 provides the status of CARRs for radiological performance testing during 2019. It has been determined that causes of the unacceptable results did not impact any data reported to our clients.

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13. References

1. GEL Quality Assurance Plan, GL-QS-B-001

2. GEL Standard Operating Procedure for the Conduct of Quality Audits, GL-QS-E-001

3. GEL Standard Operating Procedure for Conducting Corrective/Preventive Action and Identifying Opportunities for Improvement, GL-QS-E-002

4. GEL Standard Operating Procedure for AlphaLIMS Documentation of Nonconformance Reporting and Dispositioning and Control of Nonconforming Items, GL-QS-E-004

5. GEL Standard Operating Procedure for Handling Proficiency Evaluation Samples, GL-QS-E-013

6. GEL Standard Operating Procedure for Quality Assurance Measurement Calculations and Processes, GL-QS-E-014

7. 40 CFR Part 136 Guidelines Establishing Test Procedures for the Analysis of Pollutants

8. ISO/IEC 17025-2017, General Requirements for the Competence of Testing and Calibration Laboratories

9. ANSI/ASQC E4-1994, Specifications and Guidelines for Quality Systems for Environmental Data Collection and Environmental Technology Programs, American National Standard

10. 2003 NELAC Standard, National Environmental Laboratory Accreditation Program

11. 2009 TNI Standard, The NELAC Institute, National Environmental Accreditation Program

12. MARLAP, Multi-Agency Radiological Laboratory Analytical Protocols

13. 10 CFR Part 21, Reporting of Defects and Noncompliance

14. 10 CFR Part 50 Appendix B, Quality Assurance Criteria for Nuclear Power Plants and Fuel Reprocessing Plants

15. 10 CFR Part 61, Licensing Requirements for Land Disposal and Radioactive Waste

16. NRC REG Guide 4.15 and NRC REG Guide 4.8 Page 11 of 52

TABLE 1 2019 RADIOLOGICAL PROFICIENCY TESTING RESULTS AND ACCEPTANCE CRITERIA Report Closing /

PT Quarter / Received Sample Reported Assigned Acceptance Performance Provider Year Date Sample Number Media Units Analyte Value Value Limits Evaluation ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Barium-133 105 99.5 84.1 - 109 Acceptable ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Cesium-134 48.2 49.1 39.5 - 54.0 Acceptable ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Cesium-137 128 125 112 - 140 Acceptable ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Cobalt-60 104 96.4 86.8 - 108 Acceptable ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Zinc-65 88.1 77.4 69.5 - 93.2 Acceptable ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Gross Alpha 22.3 21.8 10.9 - 29.5 Acceptable ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Gross Alpha 23.5 21.8 10.9 - 29.5 Acceptable ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Gross Beta 43.6 55.7 38.1 - 62.6 Acceptable ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Radium-226 6.47 7.37 5.55 - 8.72 Acceptable ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Radium-228 3.99 4.28 2.48 - 5.89 Acceptable ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Radium-228 4.48 4.28 2.48 - 5.89 Acceptable ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Uranium (Nat) 70 68.2 55.7 - 75.0 Acceptable Uranium (Nat)

ERA 1st /2019 2/25/19 RAD-116 Water µg/L mass 99.3 99.5 81.3 - 109 Acceptable ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Tritium 2160 2110 1740 - 2340 Acceptable ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Tritium 1920 2110 1740 - 2340 Acceptable Not ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Strontium-89 78.5 66.9 54.4 - 75.0 Acceptable Not ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Strontium-89 76.5 66.9 54.4 - 75.0 Acceptable ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Strontium-90 40.1 41 30.2 - 47.1 Acceptable ERA 1st /2019 2/25/19 RAD-116 Water pCi/L Strontium-90 42.2 41 30.2 - 47.1 Acceptable ERA 1st /2019 3/14/19 RAD-9116 Water pCi/L Iodine-131 27.4 25.9 21.5 - 30.6 Acceptable ERA 1st /2019 3/14/19 RAD-9116 Water pCi/L Iodine-131 25.1 25.9 21.5 - 30.6 Acceptable EZA 1st/2019 05/10/19 E12364 Cartridge pCi Iodine-131 7.80E+01 7.54E+01 1.03 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Cerium-141 1.23E+02 1.17E+02 1.05 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Cobalt-58 1.51E+02 1.43E+02 1.05 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Cobalt-60 3.12E+02 2.99E+02 1.04 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Chromium-51 3.04E+02 2.93E+02 1.04 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Cesium-134 1.53E+02 1.60E+02 0.96 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Cesium-137 2.04E+02 1.96E+02 1.04 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Manganese-54 1.55E+02 1.43E+02 1.08 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Iron-59 1.78E+02 1.59E+02 1.12 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Zinc-65 2.42E+02 2.20E+02 1.1 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Cerium-141 1.20E+02 1.13E+02 1.06 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Cesium-134 1.43E+02 1.55E+02 0.92 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Cesium-137 2.09E+02 1.91E+02 1.10 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Chromium-51 3.55E+02 2.84E+02 1.25 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Cobalt-58 1.43E+02 1.39E+02 1.03 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Cobalt-60 3.18E+02 2.90E+02 1.10 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Iodine-131 8.89E+01 9.65E+01 1.03 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Iron-59 1.76E+02 1.54E+02 1.14 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Manganese-54 1.55E+02 1.39E+02 1.12 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Zinc-65 2.44E+02 2.14E+02 1.14 Acceptable EZA 2nd/2019 07/29/19 E12360 Cartridge pCi Iodine-131 8.40E+01 8.17E+01 1.03 Acceptable EZA 2nd/2019 07/29/19 E12361 Milk pCi/L Strontium-89 1.01E+02 8.29E+01 1.22 Acceptable Page 12 of 52

EZA 2nd/2019 07/29/19 E12361 Milk pCi/L Strontium-90 1.21E+01 1.35E+01 0.90 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Cerium-141 1.39E+02 1.33E+02 1.04 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Cobalt-58 1.17E+02 1.12E+02 1.05 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Cobalt-60 2.05E+02 1.98E+02 1.04 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Chromium-51 3.41E+02 3.37E+02 1.01 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Cesium-134 1.30E+02 1.40E+02 0.93 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Cesium-137 1.78E+02 1.68E+02 1.06 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Iron-59 1.66E+02 1.41E+02 1.18 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Iodine-131 8.51E+01 8.14E+01 1.05 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Manganese-54 2.09E+02 1.90E+02 1.10 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Zinc-65 2.82E+02 2.47E+02 1.14 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Cerium-141 1.50E+02 1.45E+02 1.03 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Cobalt-58 1.22E+02 1.22E+02 1.00 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Cobalt-60 2.22E+02 2.16E+02 1.03 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Chromium-51 3.56E+02 3.68E+02 0.97 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Cesium-134 1.37E+02 1.53E+02 0.89 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Cesium-137 1.90E+02 1.84E+02 1.03 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Iron-59 1.73E+02 1.54E+02 1.12 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Iodine-131 8.92E+01 8.91E+01 1.00 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Manganese-54 2.27E+02 2.70E+00 1.10 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Zinc-65 3.01E+02 2.70E+02 1.11 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-GrF40 Filter Bq/sample Gross alpha 0.540 0.528 0.158-0.898 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-GrF41 Filter Bq/sample Gross beta 0.928 0.948 0.474-1.422 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-GrW40 Water Bq/L Gross alpha 0.819 0.840 0.25-1.43 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-GrW40 Water Bq/L Gross beta 2.390 2.330 1.17-3.50 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Americium-241 52.8 49.9 34.9-64.9 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Cesium-134 2.25 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Cesium-137 1290.00 1164.0 815-1513 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Cobalt-57 0.133 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Cobalt-60 853 855 599-1112 Acceptable Not MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Iron-55 486 344 241-447 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Manganese-54 1130 1027 719-1335 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Nickel-63 524.00 519 363-675 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Plutonium-238 75.2 71.0 49.7-92.3 Acceptable Plutonium-MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg 239/240 67.3 59.8 41.9-77.7 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Potassium-40 596 585 410-761 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Strontium-90 3.44 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Technetium-99 381 408 286-530 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Uranium 234 54.7 56.0 39-73 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Uranium-238 204 205 144-267 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Zinc-65 751 668 468-868 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Americium-241 0.549 0.582 0.407-0.757 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Cesium-134 5.32 5.99 4.19-7.79 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Cesium-137 0.0 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Cobalt-57 9.840 10 7.0-13.0 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Cobalt-60 6.7 6.7 4.7-8.7 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Hydrogen-3 389.00 421 295-547 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Iron-55 0.0173 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Manganese-54 8.80 8.4 5.9-10.9 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Nickel-63 4.62 5.8 4.1-7.5 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Plutonium-238 0.419 0.451 0.316-0.586 Acceptable Page 13 of 52

Plutonium-MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L 239/240 0.0158 0.0045 Sens. Eval. Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Potassium-40 -0.156 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Radium-226 0.593 0.672 0.470-0.874 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Strontium-90 5.86 6.350 4.45-8.26 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Technetium-99 3.66 3.3 2.34-4.34 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Uranium-234 0.81 0.8 0.56-1.04 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Uranium-238 0.802 0.81 0.57-1.05 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Zinc-65 -0.0318 Test Acceptable 0.0448-MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter ug/sample Uranium-235 0.0566 0.0640 0.0832 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter ug/sample Uranium-238 7.76 8.8 6.2-11.4 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter ug/sample Uranium-Total 7.72 8.9 6.2-11.6 Acceptable 0.0206-MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Americium-241 0.0284 0.0294 0.0382 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Cesium-134 0.251 0.216 0.151-0.281 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Cesium-137 0.313 0.290 0.203-0.377 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Cobalt-57 0.424 0.411 0.288-0.534 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Cobalt-60 0.373 0.34 0.238-0.442 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Manganese-54 0.576 0.547 0.383-0.711 Acceptable 0.0368-MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Plutonium-238 0.0551 0.0526 0.0684 Acceptable Plutonium- 0.0265-MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample 239/240 0.0377 0.038 0.0493 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Strontium-90 0.616 0.662 0.463-0.861 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Uranium-234 0.108 0.106 0.074-0.138 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Uranium-238 0.118 0.110 0.077-0.143 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Zinc-65 0.0143 Test Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Americium-241 0.000092 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Cesium-134 2.25 2.44 1.71-3.17 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Cesium-137 2.37 2.30 1.61-2.99 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Cobalt-57 2.04 2.07 1.45-2.69 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Cobalt-60 -0.0061 Test Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Manganese-54 0.00255 Test Acceptable 0.0237-MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Plutonium-238 0.0247 0.0339 0.0441 Acceptable Plutonium- 0.0322-MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample 239/240 0.0425 0.0460 0.0598 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Strontium-90 0.00951 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Uranium-234 0.20 0.217 0.152-0.282 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Uranium-238 0.216 0.225 0.158-0.293 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Zinc-65 1.85 1.71 1.20-2.22 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-XaW40 Water Bq/L Iodine-129 0.64 0.62 0.431-0.801 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Actinium-228 3060 3280 2160 - 4130 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Americium-241 346 474 256 - 671 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Bismuth-212 3200 3400 973 - 5070 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Bismuth-214 1160 1370 658 - 2040 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Cesium-134 6590 9280 6350 - 11100 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Cesium-137 831 1030 779 - 1300 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Cobalt-60 4830 5880 4630 - 7260 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Lead-212 3360 3380 2360 - 4270 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Lead-214 1500 1450 609 - 2280 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Manganese-54 <25.4 <1000 <1000 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Plutonium-238 955 1220 608 - 1850 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Plutonium-239 579 829 452 - 1190 Acceptable Page 14 of 52

16700 -

ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Potassium-40 25800 24300 29000 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Strontium-90 1220 1350 420 - 2100 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Thorium-234 1050 1470 555 - 2520 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-234 1170 1050 492 - 1380 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-234 925 1050 492 - 1380 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-234 925 1050 492 - 1380 Acceptable Not ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-238 437 1030 565 - 1380 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-238 928 1030 565 - 1380 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-238 880 1030 565 - 1380 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-Total 2090 2030 1130 - 2620 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-Total 1910 2030 1130 - 2620 Acceptable Uranium-Total ERA 2nd/2019 05/21/19 MRAD-30 Soil µg/kg (mass) 1360 2420 1090 - 3270 Acceptable Uranium-Total ERA 2nd/2019 05/21/19 MRAD-30 Soil µg/kg (mass) 2780 2420 1090 - 3270 Acceptable Uranium-Total ERA 2nd/2019 05/21/19 MRAD-30 Soil µg/kg (mass) 2630 2420 1090 - 3270 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Zinc-65 1300 1460 1170 - 1990 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Americium-241 2090 1680 1040 - 2370 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Cesium-134 1590 1640 1090 - 2180 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Cesium-137 1510 1410 1080 - 1900 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Cobalt-60 1200 1000 785 - 1310 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Curium-244 87.1 87.3 49.2 - 109 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Manganese-54 <35.9 <300 <300 Acceptable Not ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Plutonium-238 110 76 52.6 - 98.0 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Plutonium-239 1150 941 650 - 1190 Acceptable 25900 -

ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Potassium-40 41500 34500 43700 Acceptable Not ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Strontium-90 4670 3530 1990 - 4600 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Uranium-234 1210 961 675 - 1230 Acceptable Not ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Uranium-238 1230 953 673 - 1190 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Uranium-Total 2540 1940 1240 - 2620 Acceptable Uranium-Total Not ERA 2nd/2019 05/21/19 MRAD-30 Vegetation µg/kg (mass) 3720 2830 2170 - 3500 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Zinc-65 715 527 393 - 781 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Americium-241 18.7 18.7 13.3 - 24.9 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Cesium-134 639 721 468 - 884 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Cesium-137 627 634 521 - 832 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Cobalt-60 103 93.8 79.7 - 119 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Iron-55 613 718 262 - 1150 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Manganese-54 <3.29 <50.0 <50.0 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Plutonium-238 31.1 33.8 25.5 - 41.5 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Plutonium-239 62 67 50.1 - 80.8 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Strontium-90 169 181 114 - 246 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Uranium-234 17.1 18.2 13.5 - 21.3 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Uranium-234 16.4 18.2 13.5 - 21.3 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Uranium-238 16.9 18.1 13.7 - 21.6 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Uranium-238 16 18.1 13.7 - 21.6 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Uranium-Total 33.1 37.1 27.1 - 44.0 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Uranium-Total 34.7 37.1 27.1 - 44.0 Acceptable Uranium-Total ERA 2nd/2019 05/21/19 MRAD-30 Filter µg/Filter (mass) 50.9 54.1 43.4 - 63.4 Acceptable Uranium-Total ERA 2nd/2019 05/21/19 MRAD-30 Filter µg/Filter (mass) 48 54.1 43.4 - 63.4 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Zinc-65 1520 1380 1130 - 2110 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Gross Alpha 43 50.3 26.3 - 82.9 Acceptable Page 15 of 52

ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Gross Beta 75.7 78.6 47.7 - 119 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Americium-241 180 168 115 - 215 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Cesium-134 116 123 92.9 - 135 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Cesium-137 126 125 107 - 142 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Cobalt-60 1200 1100 949 - 1260 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Iron-55 1310 1320 776 - 1920 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Manganese-54 <5.6 <100 <100 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Plutonium-238 41.2 42.8 25.7 - 55.5 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Plutonium-239 117 123 76.1 - 152 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Strontium-90 365 315 227 - 389 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-234 56.3 55.2 42.0 - 63.1 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-234 56 55.2 42.0 - 63.1 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-234 53.7 55.2 42.0 - 63.1 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-234 56 55.2 42.0 - 63.1 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-238 55.3 54.7 42.4 - 64.4 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-238 51.8 54.7 42.4 - 64.4 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-238 51 54.7 42.4 - 64.4 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-Total 107.3 112 87.4 - 128 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-Total 113 112 87.4 - 128 Acceptable Uranium-Total ERA 2nd/2019 05/21/19 MRAD-30 Water µg/L (mass) 166 163 132 - 185 Acceptable Uranium-Total ERA 2nd/2019 05/21/19 MRAD-30 Water µg/L (mass) 153 163 132 - 185 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Zinc-65 1990 1780 1580 - 2250 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Gross Alpha 79.8 68.5 25.0 - 94.5 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Gross Beta 140 151 75.5 - 208 Acceptable 17900 -

ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Tritium 22200 23700 28800 Acceptable ERA 2nd/2019 05/23/19 RAD-117 Water pCi/L Strontium-89 35.9 33.3 24.5-40.1 Acceptable ERA 2nd/2019 05/24/19 RAD-117 Water pCi/L Strontium-89 34.4 33.3 24.5-40.2 Acceptable ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Barium-133 68.2 66.9 55.8 - 73.6 Acceptable ERA 3rd/2019 3rd/2019 RAD - 118 Water pCi/L Cesium-134 30.4 32 25.1 - 35.2 Acceptable ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Cesium-137 22.7 21.4 17.6 - 26.7 Acceptable ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Cobalt-60 102 95.1 85.6 - 107 Acceptable ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Zinc-65 49.2 41.2 35.3 - 51.4 Acceptable Not ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Gross Alpha 88.7 70.6 37.1 - 87.1 Acceptable ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Gross Alpha 80.7 70.6 37.1 - 87.1 Acceptable ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Gross Beta 57.7 63.9 44.2 - 70.5 Acceptable ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Radium-226 18.5 18.5 13.8 - 21.1 Acceptable ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Radium-228 7.97 8.16 5.21 - 10.3 Acceptable ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Radium-228 6.72 8.16 5.21 - 10.3 Acceptable ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Uranium (Nat) 67.8 68.3 55.8 - 75.1 Acceptable Uranium (Nat)

ERA 3rd/2019 08/26/19 RAD - 118 Water µg/L mass 100.73 99.6 81.4 - 110 Acceptable 14600 -

ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Tritium 14700 16700 18400 Acceptable 14600 -

ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Tritium 15000 16700 18400 Acceptable Not ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Strontium-89 69.4 58.7 47.1 - 66.5 Acceptable ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Strontium-89 62.1 58.7 47.1 - 66.5 Acceptable ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Strontium-90 34.3 38.5 28.3 - 44.3 Acceptable ERA 3rd/2019 08/26/19 RAD - 118 Water pCi/L Strontium-90 33.4 38.5 28.3 - 44.3 Acceptable EZA 3rd/2019 11/08/19 E12368 Cartridge pCi Iodine-131 9.93E+01 9.33E+01 1.06 Acceptable EZA 3rd/2019 11/08/19 E12369 Milk pCi/L Strontium-89 8.71E+01 9.39E+01 0.93 Acceptable EZA 3rd/2019 11/08/19 E12369 Milk pCi/L Strontium-90 7.02E+00 1.29E+01 0.54 Acceptable EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Cerium-141 1.69E+02 1.67E+02 1.01 Acceptable EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Cobalt-58 1.74E+02 1.75E+02 0.99 Acceptable Page 16 of 52

EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Cobalt-60 2.08E+02 2.11E+02 0.99 Acceptable EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Chromium-51 3.64E+02 3.31E+02 1.1 Acceptable EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Cesium-134 1.93E+02 2.07E+02 0.93 Acceptable EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Cesium-137 1.49E+02 1.51E+02 0.99 Acceptable EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Iron-59 1.66E+02 1.48E+02 1.12 Acceptable EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Iodine-131 9.28E+01 9.21E+01 1.01 Acceptable EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Manganese-54 1.69E+02 1.54E+02 1.09 Acceptable EZA 3rd/2019 11/08/19 E12371 Milk pCi/L Zinc-65 3.21E+02 2.93E+02 1.1 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Cerium-141 1.41E+02 1.27E+02 1.11 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Cobalt-58 1.36E+02 1.33E+02 1.03 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Cobalt-60 1.68E+02 1.60E+02 1.036 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Chromium-51 2.45E+02 2.51E+02 0.98 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Cesium-134 1.50E+02 1.57E+02 0.96 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Cesium-137 1.22E+02 1.14E+02 1.07 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Iron-59 1.27E+02 1.12E+02 1.13 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Iodine-131 9.34E+01 8.94E+01 1.04 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Manganese-54 1.34E+02 1.17E+02 1.15 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Zinc-65 2.57E+02 2.22E+02 1.16 Acceptable EZA 4th/2019 02/05/20 E12372 Cartridge pCi Iodine-131 9.07E+01 8.88E+01 1.02 Acceptable EZA 4th/2019 02/05/20 E12373 Milk pCi/L Strontium-89 6.60E+01 8.06E+01 0.82 Acceptable EZA 4th/2019 02/05/20 E12373 Milk pCi/L Strontium-90 1.11E+01 1.10E+01 1.00 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Cerium-141 7.95E+01 8.30E+01 0.96 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Cobalt-58 8.93E+01 8.99E+01 0.99 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Cobalt-60 1.17E+02 1.15E+02 1.02 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Chromium-51 2.67E+02 2.41E+02 1.11 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Cesium-134 9.79E+01 1.13E+02 0.87 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Cesium-137 1.01E+02 1.02E+02 0.99 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Iron-59 1.01E+02 8.71E+01 1.16 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Iodine-131 9.34E+01 9.45E+01 0.99 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Manganese-54 1.34E+02 1.30E+02 1.03 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Zinc-65 1.17E+02 1.59E+02 1.08 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Cerium-141 8.92E+01 8.41E+01 1.06 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Cobalt-58 9.54E+01 9.11E+01 1.05 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Cobalt-60 1.22E+02 1.17E+02 1.05 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Chromium-51 2.64E+02 2.44E+02 1.08 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Cesium-134 1.06E+02 1.14E+02 0.93 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Cesium-137 1.09E+02 1.03E+02 1.06 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Iron-59 9.32E+01 8.82E+01 1.06 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Iodine-131 1.04E+02 9.45E+01 1.10 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Manganese-54 1.44E+02 1.31E+02 1.10 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Zinc-65 1.91E+02 1.61E+02 1.19 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Americium-241 86.1 74.7 52.3-97.1 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Cesium-134 896 1020 714-1326 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Cesium-137 865 789 552-1026 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Cobalt-57 0.227 Test Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Cobalt-60 761 760 532-988 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Iron-55 -48.0 Test Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Manganese-54 816 745 522-969 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Nickel-63 552 629 440-818 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Plutonium-238 55.3 52.1 36.5-67.7 Acceptable Plutonium-MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg 239/240 59.9 61.4 43.0-79.8 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Potassium-40 604 555 389-722 Acceptable Page 17 of 52

MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Strontium-90 609 572 400-744 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Technetium-99 514 593 415-771 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg U-234/233 125 116 81-151 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Uranium-238 122 117 82-152 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Zinc-65 -0.650 Test Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Americium-241 0.511 0.522 0.365-0.679 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Cesium-134 0.0266 Test Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Cesium-137 19.70 18.4 12.9-23.9 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Cobalt-57 16.2 15.6 10.9-20.3 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Cobalt-60 9.01 8.8 6.2-11.4 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Hydrogen-3 166 175 123-228 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Iron-55 13.80 15.7 11.0-20.4 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Manganese-54 22.6 20.6 14.4-26.8 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Nickel-63 9.26 9.7 6.8-12.6 Acceptable Sens.

MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Plutonium-238 0.0164 0.0063 Evaluation Acceptable Plutonium-MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L 239/240 0.701 0.727 0.509-0.945 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Potassium-40 -0.121 Test Acceptable Not MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Radium-226 0.481 0.307 0.215-0.399 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Strontium-90 9.34 10.60 7.4-13.8 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Technetium-99 0.119 Test Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Uranium-234/233 1.09 1.07 0.75-1.39 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Uranium-238 1.12 1.05 0.74-1.37 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Zinc-65 23.1 20.3 5.27-9.79 Acceptable 0.0396-MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter ug/sample Uranium-235 0.0565 0.0565 0.0735 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter ug/sample Uranium-238 7.8 7.7 5.4-10.0 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter ug/sample Uranium-Total 7.9 7.8 5.5-10.1 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Americium-241 0.00106 Test Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Cesium-134 0.00080 Test Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Cesium-137 1.63 1.58 1.11-2.05 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Cobalt-57 1.23 1.16 0.81-1.51 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Cobalt-60 0.783 0.815 0.571-1.060 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Manganese-54 1.35 1.37 0.96-1.78 Acceptable 0.0533-MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Plutonium-238 0.0755 0.0761 0.0989 Acceptable Plutonium- 0.0328-MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample 239/240 0.0485 0.0468 0.0608 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Strontium-90 0.442 0.498 0.349-0.647 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Uranium-234/233 0.0965 0.093 0.065-0.121 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Uranium-238 0.0935 0.096 0.067-0.125 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Zinc-65 1.09 1.06 0.74-1.38 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Americium-241 0.0958 0.090 0.063-0.117 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Cesium-134 0.0190 Test Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Cesium-137 3.34 3.28 2.30-4.26 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Cobalt-57 4.50 4.57 3.20-5.94 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Cobalt-60 5.34 5.30 3.71-6.89 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Manganese-54 4.57 4.49 3.14-5.84 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Plutonium-238 0.0882 0.081 0.057-0.105 Acceptable Plutonium- False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample 239/240 0.00127 Test Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Strontium-90 0.847 1.00 0.70-1.30 Acceptable 0.0453-MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Uranium-234/233 0.0656 0.0647 0.0841 Acceptable Page 18 of 52

MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Uranium-238 0.0660 0.0670 0.0469-0.871 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Zinc-65 2.89 2.85 2.00-3.71 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-XaW41 Alk. Water Bq/L Iodine-129 1.69 1.78 1.25-2.31 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Actinium-228 3730 3170 2090 - 3990 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Americium-241 1740 1920 1040 - 2720 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Bismuth-212 4130 3280 939 - 4890 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Bismuth-214 1370 1330 638 - 1980 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Cesium-134 7600 7650 5230 - 9140 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Cesium-137 1350 1230 930 - 1560 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Cobalt-60 3840 3710 2920 - 4580 Acceptable Not ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Lead-212 4300 3350 2340 - 4240 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Lead-214 1740 1450 609 - 2280 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Manganese-54 <26.5 <1000 <1000 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Plutonium-238 680 546 272 - 830 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Plutonium-239 1010 1090 594 - 1570 Acceptable 17000 -

ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Potassium-40 26200 24700 29500 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Strontium-90 1660 1910 594 - 2980 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Thorium-234 1580 1360 513 - 2330 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Uranium-234 1140 1030 483 - 1350 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Uranium-234 1290 1030 483 - 1350 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Uranium-238 1080 974 534 - 1310 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Uranium-238 1070 974 534 - 1310 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Uranium-Total 2290 1930 1070 - 2500 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Uranium-Total 2409 1930 1070 - 2500 Acceptable Uranium-Total ERA 4th/2019 11/19/19 MRAD-31 Soil µg/kg (mass) 3250 2410 1090 - 3250 Acceptable Uranium-Total ERA 4th/2019 11/19/19 MRAD-31 Soil µg/kg (mass) 3200 2410 1090 - 3250 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil µg/kg Zinc-65 3100 2690 2150 - 3670 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Americium-241 2070 2050 1270 - 2900 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Cesium-134 1910 2210 1470 - 2940 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Cesium-137 2500 2480 1910-3340 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Cobalt-60 604 607 476 - 793 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Curium-244 2760 3010 1700 - 3740 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Manganese-54 <35.4 <300 <300 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Plutonium-238 2120 1920 1330 - 2480 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Plutonium-239 2860 2600 1800 - 3290 Acceptable 29500 -

ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Potassium-40 41600 39300 49800 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Strontium-90 4010 3940 2220 - 5130 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Uranium-234 3510 3320 2330 - 4230 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Uranium-238 3620 3290 2320 - 4110 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Uranium-Total 7360 6670 4260 - 8990 Acceptable Uranium-Total ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg (mass) 10900 9730 7470 - 12100 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Zinc-65 1860 1620 1210 - 2400 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Americium-241 34.5 32 22.8 - 42.7 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Cesium-134 55.6 59 38.3 - 72.3 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Cesium-137 443 437 359 - 573 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Cobalt-60 63.7 58.4 49.6 - 74.2 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Iron-55 150 151 55.1 - 241 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Manganese-54 <1.96 <50.0 <50.0 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Plutonium-238 23.8 21 15.9 - 25.8 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Plutonium-239 19.9 19 14.2 - 22.9 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Strontium-90 34.8 34.5 21.8 - 47.0 Acceptable Page 19 of 52

ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Uranium-234 27.1 27.5 20.4 - 32.2 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Uranium-234 30.4 27.5 20.4 - 32.2 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Uranium-238 28.4 27.3 20.6 - 32.6 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Uranium-238 25.2 27.3 20.6 - 32.6 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Uranium-Total 57.3 56.1 41.0 - 66.5 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Uranium-Total 55.6 56.1 41.0 - 66.5 Acceptable Uranium-Total ERA 4th/2019 11/19/19 MRAD-31 Filter µg/Filter (mass) 85.4 81.8 65.6 - 95.8 Acceptable Uranium-Total ERA 4th/2019 11/19/19 MRAD-31 Filter µg/Filter (mass) 75.6 81.8 65.6 - 95.8 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Zinc-65 412 364 298 - 556 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Gross Alpha 71 59 30.8 - 97.2 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Gross Beta 54.7 57.6 34.9 - 87.0 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Americium-241 67.6 64.2 44.1 - 82.1 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Cesium-134 1820 1960 1480 - 2160 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Cesium-137 1820 1840 1580 - 2090 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Cobalt-60 1970 1870 1610 - 2150 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Iron-55 1410 1460 858 - 2120 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Manganese-54 <7.24 <100 <100 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Plutonium-238 41.2 47.8 28.7 - 61.9 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Plutonium-239 36.9 46.8 29.0 - 57.7 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Strontium-90 508 481 346 - 595 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Uranium-234 135 139 106 - 159 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Uranium-234 138 139 106 - 159 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Uranium-238 141 137 106 - 161 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Uranium-238 118 137 106 - 161 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Uranium-Total 285 282 220 - 321 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Uranium-Total 261.3 282 220 - 321 Acceptable Uranium-Total ERA 4th/2019 11/19/19 MRAD-31 Water µg/L (mass) 424 411 333 - 466 Acceptable Uranium-Total ERA 4th/2019 11/19/19 MRAD-31 Water µg/L (mass) 353 411 333 - 466 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Zinc-65 1490 1370 1220 - 1730 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Gross Alpha 147 124 45.3 - 171 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Gross Beta 72.9 68 34.0 - 93.6 Acceptable 16800 -

ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Tritium 20900 22300 27100 Acceptable Page 20 of 52

TABLE 2 2019 ECKERT & ZIEGLER ANALYTICS PERFORMANCE EVALUATION RESULTS Report Acceptance PT Quarter / Received Sample Sample Analyte / GEL Known Range/

Provider Year Date Number Media Unit Nuclide Value value Ratio Evaluation EZA 2nd/2019 07/29/19 E12360 Cartridge pCi Iodine-131 8.40E+01 8.17E+01 1.03 Acceptable EZA 2nd/2019 07/29/19 E12361 Milk pCi/L Strontium-89 1.01E+02 8.29E+01 1.22 Acceptable EZA 2nd/2019 07/29/19 E12361 Milk pCi/L Strontium-90 1.21E+01 1.35E+01 0.90 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Cerium-141 1.39E+02 1.33E+02 1.04 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Cobalt-58 1.17E+02 1.12E+02 1.05 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Cobalt-60 2.05E+02 1.98E+02 1.04 Acceptable Chromium-EZA 2nd/2019 07/29/19 E12362 Milk pCi/L 51 3.41E+02 3.37E+02 1.01 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Cesium-134 1.30E+02 1.40E+02 0.93 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Cesium-137 1.78E+02 1.68E+02 1.06 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Iron-59 1.66E+02 1.41E+02 1.18 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Iodine-131 8.51E+01 8.14E+01 1.05 Acceptable Manganese-EZA 2nd/2019 07/29/19 E12362 Milk pCi/L 54 2.09E+02 1.90E+02 1.10 Acceptable EZA 2nd/2019 07/29/19 E12362 Milk pCi/L Zinc-65 2.82E+02 2.47E+02 1.14 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Cerium-141 1.50E+02 1.45E+02 1.03 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Cobalt-58 1.22E+02 1.22E+02 1.00 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Cobalt-60 2.22E+02 2.16E+02 1.03 Acceptable Chromium-EZA 2nd/2019 07/29/19 E12363 Water pCi/L 51 3.56E+02 3.68E+02 0.97 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Cesium-134 1.37E+02 1.53E+02 0.89 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Cesium-137 1.90E+02 1.84E+02 1.03 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Iron-59 1.73E+02 1.54E+02 1.12 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Iodine-131 8.92E+01 8.91E+01 1.00 Acceptable Manganese-EZA 2nd/2019 07/29/19 E12363 Water pCi/L 54 2.27E+02 2.70E+00 1.10 Acceptable EZA 2nd/2019 07/29/19 E12363 Water pCi/L Zinc-65 3.01E+02 2.70E+02 1.11 Acceptable EZA 1st/2019 05/10/19 E12364 Cartridge pCi Iodine-131 7.80E+01 7.54E+01 1.03 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Cerium-141 1.23E+02 1.17E+02 1.05 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Cobalt-58 1.51E+02 1.43E+02 1.05 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Cobalt-60 3.12E+02 2.99E+02 1.04 Acceptable Chromium-EZA 1st/2019 05/10/19 E12366A Milk pCi/L 51 3.04E+02 2.93E+02 1.04 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Cesium-134 1.53E+02 1.60E+02 0.96 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Cesium-137 2.04E+02 1.96E+02 1.04 Acceptable Manganese-EZA 1st/2019 05/10/19 E12366A Milk pCi/L 54 1.55E+02 1.43E+02 1.08 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Iron-59 1.78E+02 1.59E+02 1.12 Acceptable EZA 1st/2019 05/10/19 E12366A Milk pCi/L Zinc-65 2.42E+02 2.20E+02 1.1 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Cerium-141 1.20E+02 1.13E+02 1.06 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Cesium-134 1.43E+02 1.55E+02 0.92 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Cesium-137 2.09E+02 1.91E+02 1.10 Acceptable Chromium-EZA 1st/2019 05/10/19 E12367 Water pCi/L 51 3.55E+02 2.84E+02 1.25 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Cobalt-58 1.43E+02 1.39E+02 1.03 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Cobalt-60 3.18E+02 2.90E+02 1.10 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Iodine-131 8.89E+01 9.65E+01 1.03 Acceptable EZA 1st/2019 05/10/19 E12367 Water pCi/L Iron-59 1.76E+02 1.54E+02 1.14 Acceptable Manganese-EZA 1st/2019 05/10/19 E12367 Water pCi/L 54 1.55E+02 1.39E+02 1.12 Acceptable Page 21 of 52

EZA 1st/2019 05/10/19 E12367 Water pCi/L Zinc-65 2.44E+02 2.14E+02 1.14 Acceptable EZA 3rd/2019 11/08/19 E12368 Cartridge pCi Iodine-131 9.93E+01 9.33E+01 1.06 Acceptable EZA 3rd/2019 11/08/19 E12369 Milk pCi/L Strontium-89 8.71E+01 9.39E+01 0.93 Acceptable EZA 3rd/2019 11/08/19 E12369 Milk pCi/L Strontium-90 7.02E+00 1.29E+01 0.54 Acceptable EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Cerium-141 1.69E+02 1.67E+02 1.01 Acceptable EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Cobalt-58 1.74E+02 1.75E+02 0.99 Acceptable EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Cobalt-60 2.08E+02 2.11E+02 0.99 Acceptable Chromium-EZA 3rd/2019 11/08/19 E12370 Milk pCi/L 51 3.64E+02 3.31E+02 1.1 Acceptable EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Cesium-134 1.93E+02 2.07E+02 0.93 Acceptable EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Cesium-137 1.49E+02 1.51E+02 0.99 Acceptable EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Iron-59 1.66E+02 1.48E+02 1.12 Acceptable EZA 3rd/2019 11/08/19 E12370 Milk pCi/L Iodine-131 9.28E+01 9.21E+01 1.01 Acceptable Manganese-EZA 3rd/2019 11/08/19 E12370 Milk pCi/L 54 1.69E+02 1.54E+02 1.09 Acceptable EZA 3rd/2019 11/08/19 E12371 Milk pCi/L Zinc-65 3.21E+02 2.93E+02 1.1 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Cerium-141 1.41E+02 1.27E+02 1.11 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Cobalt-58 1.36E+02 1.33E+02 1.03 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Cobalt-60 1.68E+02 1.60E+02 1.036 Acceptable Chromium-EZA 3rd/2019 11/08/19 E12371 Water pCi/L 51 2.45E+02 2.51E+02 0.98 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Cesium-134 1.50E+02 1.57E+02 0.96 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Cesium-137 1.22E+02 1.14E+02 1.07 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Iron-59 1.27E+02 1.12E+02 1.13 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Iodine-131 9.34E+01 8.94E+01 1.04 Acceptable Manganese-EZA 3rd/2019 11/08/19 E12371 Water pCi/L 54 1.34E+02 1.17E+02 1.15 Acceptable EZA 3rd/2019 11/08/19 E12371 Water pCi/L Zinc-65 2.57E+02 2.22E+02 1.16 Acceptable EZA 4th/2019 02/05/20 E12372 Cartridge pCi Iodine-131 9.07E+01 8.88E+01 1.02 Acceptable EZA 4th/2019 02/05/20 E12373 Milk pCi/L Strontium-89 6.60E+01 8.06E+01 0.82 Acceptable EZA 4th/2019 02/05/20 E12373 Milk pCi/L Strontium-90 1.11E+01 1.10E+01 1.00 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Cerium-141 7.95E+01 8.30E+01 0.96 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Cobalt-58 8.93E+01 8.99E+01 0.99 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Cobalt-60 1.17E+02 1.15E+02 1.02 Acceptable Chromium-EZA 4th/2019 02/05/20 E12374 Milk pCi/L 51 2.67E+02 2.41E+02 1.11 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Cesium-134 9.79E+01 1.13E+02 0.87 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Cesium-137 1.01E+02 1.02E+02 0.99 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Iron-59 1.01E+02 8.71E+01 1.16 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Iodine-131 9.34E+01 9.45E+01 0.99 Acceptable Manganese-EZA 4th/2019 02/05/20 E12374 Milk pCi/L 54 1.34E+02 1.30E+02 1.03 Acceptable EZA 4th/2019 02/05/20 E12374 Milk pCi/L Zinc-65 1.17E+02 1.59E+02 1.08 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Cerium-141 8.92E+01 8.41E+01 1.06 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Cobalt-58 9.54E+01 9.11E+01 1.05 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Cobalt-60 1.22E+02 1.17E+02 1.05 Acceptable Chromium-EZA 4th/2019 02/05/20 E12375 Water pCi/L 51 2.64E+02 2.44E+02 1.08 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Cesium-134 1.06E+02 1.14E+02 0.93 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Cesium-137 1.09E+02 1.03E+02 1.06 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Iron-59 9.32E+01 8.82E+01 1.06 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Iodine-131 1.04E+02 9.45E+01 1.10 Acceptable Manganese-EZA 4th/2019 02/05/20 E12375 Water pCi/L 54 1.44E+02 1.31E+02 1.10 Acceptable EZA 4th/2019 02/05/20 E12375 Water pCi/L Zinc-65 1.91E+02 1.61E+02 1.19 Acceptable Page 22 of 52

TABLE 3 2019 DEPARTMENT OF ENERGY MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP) RESULTS Report PT Quarter / Received Sample Analyte / GEL Known Acceptance Provider Year Date Sample Number Media Unit Nuclide Value value Range/ Ratio Evaluation MAPEP 2nd/2019 05/31/19 MAPEP-19-GrF40 Filter Bq/sample Gross alpha 0.540 0.528 0.158-0.898 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-GrF41 Filter Bq/sample Gross beta 0.928 0.948 0.474-1.422 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-GrW40 Water Bq/L Gross alpha 0.819 0.840 0.25-1.43 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-GrW40 Water Bq/L Gross beta 2.390 2.330 1.17-3.50 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Americium-241 52.8 49.9 34.9-64.9 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Cesium-134 2.25 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Cesium-137 1290.00 1164.0 815-1513 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Cobalt-57 0.133 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Cobalt-60 853 855 599-1112 Acceptable Not MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Iron-55 486 344 241-447 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Manganese-54 1130 1027 719-1335 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Nickel-63 524.00 519 363-675 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Plutonium-238 75.2 71.0 49.7-92.3 Acceptable Plutonium-MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg 239/240 67.3 59.8 41.9-77.7 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Potassium-40 596 585 410-761 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Strontium-90 3.44 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Technetium-99 381 408 286-530 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Uranium 234 54.7 56.0 39-73 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Uranium-238 204 205 144-267 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaS40 Soil Bq/Kg Zinc-65 751 668 468-868 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Americium-241 0.549 0.582 0.407-0.757 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Cesium-134 5.32 5.99 4.19-7.79 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Cesium-137 0.0 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Cobalt-57 9.840 10 7.0-13.0 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Cobalt-60 6.7 6.7 4.7-8.7 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Hydrogen-3 389.00 421 295-547 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Iron-55 0.0173 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Manganese-54 8.80 8.4 5.9-10.9 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Nickel-63 4.62 5.8 4.1-7.5 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Plutonium-238 0.419 0.451 0.316-0.586 Acceptable Plutonium-MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L 239/240 0.0158 0.0045 Sens. Eval. Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Potassium-40 -0.156 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Radium-226 0.593 0.672 0.470-0.874 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Strontium-90 5.86 6.350 4.45-8.26 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Technetium-99 3.66 3.3 2.34-4.34 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Uranium-234 0.81 0.8 0.56-1.04 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Uranium-238 0.802 0.81 0.57-1.05 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-MaW40 Water Bq/L Zinc-65 -0.0318 Test Acceptable 0.0448-MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter ug/sample Uranium-235 0.0566 0.0640 0.0832 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter ug/sample Uranium-238 7.76 8.8 6.2-11.4 Acceptable Page 23 of 52

MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter ug/sample Uranium-Total 7.72 8.9 6.2-11.6 Acceptable 0.0206-MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Americium-241 0.0284 0.0294 0.0382 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Cesium-134 0.251 0.216 0.151-0.281 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Cesium-137 0.313 0.290 0.203-0.377 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Cobalt-57 0.424 0.411 0.288-0.534 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Cobalt-60 0.373 0.34 0.238-0.442 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Manganese-54 0.576 0.547 0.383-0.711 Acceptable 0.0368-MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Plutonium-238 0.0551 0.0526 0.0684 Acceptable Plutonium- 0.0265-MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample 239/240 0.0377 0.038 0.0493 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Strontium-90 0.616 0.662 0.463-0.861 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Uranium-234 0.108 0.106 0.074-0.138 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Uranium-238 0.118 0.110 0.077-0.143 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-RdF40 Filter Bq/sample Zinc-65 0.0143 Test Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Americium-241 0.000092 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Cesium-134 2.25 2.44 1.71-3.17 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Cesium-137 2.37 2.30 1.61-2.99 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Cobalt-57 2.04 2.07 1.45-2.69 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Cobalt-60 -0.0061 Test Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Manganese-54 0.00255 Test Acceptable 0.0237-MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Plutonium-238 0.0247 0.0339 0.0441 Acceptable Plutonium- 0.0322-MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample 239/240 0.0425 0.0460 0.0598 Acceptable False Pos MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Strontium-90 0.00951 Test Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Uranium-234 0.20 0.217 0.152-0.282 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Uranium-238 0.216 0.225 0.158-0.293 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-RdV40 Vegetation Bq/sample Zinc-65 1.85 1.71 1.20-2.22 Acceptable MAPEP 2nd/2019 05/31/19 MAPEP-19-XaW40 Water Bq/L Iodine-129 0.64 0.62 0.431-0.801 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Americium-241 86.1 74.7 52.3-97.1 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Cesium-134 896 1020 714-1326 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Cesium-137 865 789 552-1026 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Cobalt-57 0.227 Test Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Cobalt-60 761 760 532-988 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Iron-55 -48.0 Test Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Manganese-54 816 745 522-969 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Nickel-63 552 629 440-818 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Plutonium-238 55.3 52.1 36.5-67.7 Acceptable Plutonium-MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg 239/240 59.9 61.4 43.0-79.8 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Potassium-40 604 555 389-722 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Strontium-90 609 572 400-744 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Technetium-99 514 593 415-771 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg U-234/233 125 116 81-151 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Uranium-238 122 117 82-152 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-MaS41 Soil Bq/Kg Zinc-65 -0.650 Test Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Americium-241 0.511 0.522 0.365-0.679 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Cesium-134 0.0266 Test Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Cesium-137 19.70 18.4 12.9-23.9 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Cobalt-57 16.2 15.6 10.9-20.3 Acceptable Page 24 of 52

MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Cobalt-60 9.01 8.8 6.2-11.4 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Hydrogen-3 166 175 123-228 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Iron-55 13.80 15.7 11.0-20.4 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Manganese-54 22.6 20.6 14.4-26.8 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Nickel-63 9.26 9.7 6.8-12.6 Acceptable Sens.

MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Plutonium-238 0.0164 0.0063 Evaluation Acceptable Plutonium-MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L 239/240 0.701 0.727 0.509-0.945 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Potassium-40 -0.121 Test Acceptable Not MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Radium-226 0.481 0.307 0.215-0.399 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Strontium-90 9.34 10.60 7.4-13.8 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Technetium-99 0.119 Test Acceptable Uranium-MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L 234/233 1.09 1.07 0.75-1.39 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Uranium-238 1.12 1.05 0.74-1.37 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-MaW41 Water Bq/L Zinc-65 23.1 20.3 5.27-9.79 Acceptable 0.0396-MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter ug/sample Uranium-235 0.0565 0.0565 0.0735 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter ug/sample Uranium-238 7.8 7.7 5.4-10.0 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter ug/sample Uranium-Total 7.9 7.8 5.5-10.1 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Americium-241 0.00106 Test Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Cesium-134 0.00080 Test Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Cesium-137 1.63 1.58 1.11-2.05 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Cobalt-57 1.23 1.16 0.81-1.51 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Cobalt-60 0.783 0.815 0.571-1.060 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Manganese-54 1.35 1.37 0.96-1.78 Acceptable 0.0533-MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Plutonium-238 0.0755 0.0761 0.0989 Acceptable Plutonium- 0.0328-MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample 239/240 0.0485 0.0468 0.0608 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Strontium-90 0.442 0.498 0.349-0.647 Acceptable Uranium-MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample 234/233 0.0965 0.093 0.065-0.121 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Uranium-238 0.0935 0.096 0.067-0.125 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdF41 Filter Bq/sample Zinc-65 1.09 1.06 0.74-1.38 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Americium-241 0.0958 0.090 0.063-0.117 Acceptable False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Cesium-134 0.0190 Test Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Cesium-137 3.34 3.28 2.30-4.26 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Cobalt-57 4.50 4.57 3.20-5.94 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Cobalt-60 5.34 5.30 3.71-6.89 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Manganese-54 4.57 4.49 3.14-5.84 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Plutonium-238 0.0882 0.081 0.057-0.105 Acceptable Plutonium- False Pos MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample 239/240 0.00127 Test Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Strontium-90 0.847 1.00 0.70-1.30 Acceptable Uranium- 0.0453-MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample 234/233 0.0656 0.0647 0.0841 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Uranium-238 0.0660 0.0670 0.0469-0.871 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-RdV41 Vegetation Bq/sample Zinc-65 2.89 2.85 2.00-3.71 Acceptable MAPEP 4th/2019 12/13/19 MAPEP-19-XaW41 Alk. Water Bq/L Iodine-129 1.69 1.78 1.25-2.31 Acceptable Page 25 of 52

TABLE 4 2019 ERA PROGRAM PERFORMANCE EVALUATION RESULTS Report PT Quarter / Received Sample Sample GEL Known Acceptance Provider Year Date Number Media Unit Analyte / Nuclide Value value Range Evaluation ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Barium-133 105 99.5 84.1 - 109 Acceptable ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Cesium-134 48.2 49.1 39.5 - 54.0 Acceptable ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Cesium-137 128 125 112 - 140 Acceptable ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Cobalt-60 104 96.4 86.8 - 108 Acceptable ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Zinc-65 88.1 77.4 69.5 - 93.2 Acceptable ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Gross Alpha 22.3 21.8 10.9 - 29.5 Acceptable ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Gross Alpha 23.5 21.8 10.9 - 29.5 Acceptable ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Gross Beta 43.6 55.7 38.1 - 62.6 Acceptable ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Radium-226 6.47 7.37 5.55 - 8.72 Acceptable ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Radium-228 3.99 4.28 2.48 - 5.89 Acceptable ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Radium-228 4.48 4.28 2.48 - 5.89 Acceptable ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Uranium (Nat) 70 68.2 55.7 - 75.0 Acceptable Uranium (Nat)

ERA 2nd/2019 2/25/19 RAD-116 Water µg/L mass 99.3 99.5 81.3 - 109 Acceptable ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Tritium 2160 2110 1740 - 2340 Acceptable ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Tritium 1920 2110 1740 - 2340 Acceptable Not ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Strontium-89 78.5 66.9 54.4 - 75.0 Acceptable Not ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Strontium-89 76.5 66.9 54.4 - 75.0 Acceptable ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Strontium-90 40.1 41 30.2 - 47.1 Acceptable ERA 2nd/2019 2/25/19 RAD-116 Water pCi/L Strontium-90 42.2 41 30.2 - 47.1 Acceptable RAD-ERA 2nd/2019 3/14/19 9116 Water pCi/L Iodine-131 27.4 25.9 21.5 - 30.6 Acceptable RAD-ERA 2nd/2019 3/14/19 9116 Water pCi/L Iodine-131 25.1 25.9 21.5 - 30.6 Acceptable ERA 2nd/2019 05/23/19 RAD-117 Water pCi/L Strontium-89 35.9 33.3 24.5-40.1 Acceptable ERA 2nd/2019 05/24/19 RAD-117 Water pCi/L Strontium-89 34.4 33.3 24.5-40.2 Acceptable ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Barium-133 68.2 66.9 55.8 - 73.6 Acceptable ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Cesium-134 30.4 32 25.1 - 35.2 Acceptable ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Cesium-137 22.7 21.4 17.6 - 26.7 Acceptable ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Cobalt-60 102 95.1 85.6 - 107 Acceptable ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Zinc-65 49.2 41.2 35.3 - 51.4 Acceptable Not ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Gross Alpha 88.7 70.6 37.1 - 87.1 Acceptable ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Gross Alpha 80.7 70.6 37.1 - 87.1 Acceptable ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Gross Beta 57.7 63.9 44.2 - 70.5 Acceptable ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Radium-226 18.5 18.5 13.8 - 21.1 Acceptable ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Radium-228 7.97 8.16 5.21 - 10.3 Acceptable ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Radium-228 6.72 8.16 5.21 - 10.3 Acceptable ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Uranium (Nat) 67.8 68.3 55.8 - 75.1 Acceptable Uranium (Nat)

ERA 3rd/2019 08/26/19 RAD-118 Water µg/L mass 100.73 99.6 81.4 - 110 Acceptable 14600 -

ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Tritium 14700 16700 18400 Acceptable 14600 -

ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Tritium 15000 16700 18400 Acceptable Not ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Strontium-89 69.4 58.7 47.1 - 66.5 Acceptable ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Strontium-89 62.1 58.7 47.1 - 66.5 Acceptable ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Strontium-90 34.3 38.5 28.3 - 44.3 Acceptable ERA 3rd/2019 08/26/19 RAD-118 Water pCi/L Strontium-90 33.4 38.5 28.3 - 44.3 Acceptable Page 26 of 52

TABLE 5 2019 ERA PROGRAM (MRAD) PERFORMANCE EVALUATION RESULTS Report Acceptance PT Quarter / Received Sample Sample GEL Known Range/

Provider Year Date Number Media Unit Analyte / Nuclide Value value Ratio Evaluation ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Actinium-228 3060 3280 2160 - 4130 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Americium-241 346 474 256 - 671 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Bismuth-212 3200 3400 973 - 5070 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Bismuth-214 1160 1370 658 - 2040 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Cesium-134 6590 9280 6350 - 11100 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Cesium-137 831 1030 779 - 1300 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Cobalt-60 4830 5880 4630 - 7260 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Lead-212 3360 3380 2360 - 4270 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Lead-214 1500 1450 609 - 2280 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Manganese-54 <25.4 <1000 <1000 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Plutonium-238 955 1220 608 - 1850 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Plutonium-239 579 829 452 - 1190 Acceptable 16700 -

ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Potassium-40 25800 24300 29000 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Strontium-90 1220 1350 420 - 2100 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Thorium-234 1050 1470 555 - 2520 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-234 1170 1050 492 - 1380 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-234 925 1050 492 - 1380 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-234 925 1050 492 - 1380 Acceptable Not ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-238 437 1030 565 - 1380 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-238 928 1030 565 - 1380 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-238 880 1030 565 - 1380 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-Total 2090 2030 1130 - 2620 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Uranium-Total 1910 2030 1130 - 2620 Acceptable Uranium-Total ERA 2nd/2019 05/21/19 MRAD-30 Soil µg/kg (mass) 1360 2420 1090 - 3270 Acceptable Uranium-Total ERA 2nd/2019 05/21/19 MRAD-30 Soil µg/kg (mass) 2780 2420 1090 - 3270 Acceptable Uranium-Total ERA 2nd/2019 05/21/19 MRAD-30 Soil µg/kg (mass) 2630 2420 1090 - 3270 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Soil pCi/kg Zinc-65 1300 1460 1170 - 1990 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Americium-241 2090 1680 1040 - 2370 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Cesium-134 1590 1640 1090 - 2180 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Cesium-137 1510 1410 1080 - 1900 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Cobalt-60 1200 1000 785 - 1310 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Curium-244 87.1 87.3 49.2 - 109 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Manganese-54 <35.9 <300 <300 Acceptable Not ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Plutonium-238 110 76 52.6 - 98.0 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Plutonium-239 1150 941 650 - 1190 Acceptable 25900 -

ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Potassium-40 41500 34500 43700 Acceptable Not ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Strontium-90 4670 3530 1990 - 4600 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Uranium-234 1210 961 675 - 1230 Acceptable Not ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Uranium-238 1230 953 673 - 1190 Acceptable Page 27 of 52

ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Uranium-Total 2540 1940 1240 - 2620 Acceptable Uranium-Total Not ERA 2nd/2019 05/21/19 MRAD-30 Vegetation µg/kg (mass) 3720 2830 2170 - 3500 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Vegetation pCi/kg Zinc-65 715 527 393 - 781 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Americium-241 18.7 18.7 13.3 - 24.9 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Cesium-134 639 721 468 - 884 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Cesium-137 627 634 521 - 832 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Cobalt-60 103 93.8 79.7 - 119 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Iron-55 613 718 262 - 1150 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Manganese-54 <3.29 <50.0 <50.0 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Plutonium-238 31.1 33.8 25.5 - 41.5 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Plutonium-239 62 67 50.1 - 80.8 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Strontium-90 169 181 114 - 246 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Uranium-234 17.1 18.2 13.5 - 21.3 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Uranium-234 16.4 18.2 13.5 - 21.3 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Uranium-238 16.9 18.1 13.7 - 21.6 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Uranium-238 16 18.1 13.7 - 21.6 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Uranium-Total 33.1 37.1 27.1 - 44.0 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Uranium-Total 34.7 37.1 27.1 - 44.0 Acceptable Uranium-Total ERA 2nd/2019 05/21/19 MRAD-30 Filter µg/Filter (mass) 50.9 54.1 43.4 - 63.4 Acceptable Uranium-Total ERA 2nd/2019 05/21/19 MRAD-30 Filter µg/Filter (mass) 48 54.1 43.4 - 63.4 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Zinc-65 1520 1380 1130 - 2110 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Gross Alpha 43 50.3 26.3 - 82.9 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Filter pCi/Filter Gross Beta 75.7 78.6 47.7 - 119 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Americium-241 180 168 115 - 215 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Cesium-134 116 123 92.9 - 135 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Cesium-137 126 125 107 - 142 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Cobalt-60 1200 1100 949 - 1260 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Iron-55 1310 1320 776 - 1920 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Manganese-54 <5.6 <100 <100 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Plutonium-238 41.2 42.8 25.7 - 55.5 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Plutonium-239 117 123 76.1 - 152 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Strontium-90 365 315 227 - 389 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-234 56.3 55.2 42.0 - 63.1 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-234 56 55.2 42.0 - 63.1 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-234 53.7 55.2 42.0 - 63.1 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-234 56 55.2 42.0 - 63.1 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-238 55.3 54.7 42.4 - 64.4 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-238 51.8 54.7 42.4 - 64.4 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-238 51 54.7 42.4 - 64.4 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-Total 107.3 112 87.4 - 128 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Uranium-Total 113 112 87.4 - 128 Acceptable Uranium-Total ERA 2nd/2019 05/21/19 MRAD-30 Water µg/L (mass) 166 163 132 - 185 Acceptable Uranium-Total ERA 2nd/2019 05/21/19 MRAD-30 Water µg/L (mass) 153 163 132 - 185 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Zinc-65 1990 1780 1580 - 2250 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Gross Alpha 79.8 68.5 25.0 - 94.5 Acceptable ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Gross Beta 140 151 75.5 - 208 Acceptable 17900 -

ERA 2nd/2019 05/21/19 MRAD-30 Water pCi/L Tritium 22200 23700 28800 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Actinium-228 3730 3170 2090 - 3990 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Americium-241 1740 1920 1040 - 2720 Acceptable Page 28 of 52

ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Bismuth-212 4130 3280 939 - 4890 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Bismuth-214 1370 1330 638 - 1980 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Cesium-134 7600 7650 5230 - 9140 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Cesium-137 1350 1230 930 - 1560 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Cobalt-60 3840 3710 2920 - 4580 Acceptable Not ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Lead-212 4300 3350 2340 - 4240 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Lead-214 1740 1450 609 - 2280 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Manganese-54 <26.5 <1000 <1000 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Plutonium-238 680 546 272 - 830 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Plutonium-239 1010 1090 594 - 1570 Acceptable 17000 -

ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Potassium-40 26200 24700 29500 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Strontium-90 1660 1910 594 - 2980 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Thorium-234 1580 1360 513 - 2330 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Uranium-234 1140 1030 483 - 1350 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Uranium-234 1290 1030 483 - 1350 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Uranium-238 1080 974 534 - 1310 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Uranium-238 1070 974 534 - 1310 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Uranium-Total 2290 1930 1070 - 2500 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil pCi/kg Uranium-Total 2409 1930 1070 - 2500 Acceptable Uranium-Total ERA 4th/2019 11/19/19 MRAD-31 Soil µg/kg (mass) 3250 2410 1090 - 3250 Acceptable Uranium-Total ERA 4th/2019 11/19/19 MRAD-31 Soil µg/kg (mass) 3200 2410 1090 - 3250 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Soil µg/kg Zinc-65 3100 2690 2150 - 3670 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Americium-241 2070 2050 1270 - 2900 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Cesium-134 1910 2210 1470 - 2940 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Cesium-137 2500 2480 1910-3340 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Cobalt-60 604 607 476 - 793 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Curium-244 2760 3010 1700 - 3740 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Manganese-54 <35.4 <300 <300 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Plutonium-238 2120 1920 1330 - 2480 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Plutonium-239 2860 2600 1800 - 3290 Acceptable 29500 -

ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Potassium-40 41600 39300 49800 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Strontium-90 4010 3940 2220 - 5130 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Uranium-234 3510 3320 2330 - 4230 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Uranium-238 3620 3290 2320 - 4110 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Uranium-Total 7360 6670 4260 - 8990 Acceptable Uranium-Total ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg (mass) 10900 9730 7470 - 12100 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Vegetation pCi/kg Zinc-65 1860 1620 1210 - 2400 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Americium-241 34.5 32 22.8 - 42.7 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Cesium-134 55.6 59 38.3 - 72.3 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Cesium-137 443 437 359 - 573 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Cobalt-60 63.7 58.4 49.6 - 74.2 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Iron-55 150 151 55.1 - 241 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Manganese-54 <1.96 <50.0 <50.0 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Plutonium-238 23.8 21 15.9 - 25.8 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Plutonium-239 19.9 19 14.2 - 22.9 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Strontium-90 34.8 34.5 21.8 - 47.0 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Uranium-234 27.1 27.5 20.4 - 32.2 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Uranium-234 30.4 27.5 20.4 - 32.2 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Uranium-238 28.4 27.3 20.6 - 32.6 Acceptable Page 29 of 52

ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Uranium-238 25.2 27.3 20.6 - 32.6 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Uranium-Total 57.3 56.1 41.0 - 66.5 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Uranium-Total 55.6 56.1 41.0 - 66.5 Acceptable Uranium-Total ERA 4th/2019 11/19/19 MRAD-31 Filter µg/Filter (mass) 85.4 81.8 65.6 - 95.8 Acceptable Uranium-Total ERA 4th/2019 11/19/19 MRAD-31 Filter µg/Filter (mass) 75.6 81.8 65.6 - 95.8 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Zinc-65 412 364 298 - 556 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Gross Alpha 71 59 30.8 - 97.2 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Filter pCi/Filter Gross Beta 54.7 57.6 34.9 - 87.0 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Americium-241 67.6 64.2 44.1 - 82.1 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Cesium-134 1820 1960 1480 - 2160 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Cesium-137 1820 1840 1580 - 2090 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Cobalt-60 1970 1870 1610 - 2150 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Iron-55 1410 1460 858 - 2120 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Manganese-54 <7.24 <100 <100 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Plutonium-238 41.2 47.8 28.7 - 61.9 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Plutonium-239 36.9 46.8 29.0 - 57.7 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Strontium-90 508 481 346 - 595 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Uranium-234 135 139 106 - 159 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Uranium-234 138 139 106 - 159 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Uranium-238 141 137 106 - 161 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Uranium-238 118 137 106 - 161 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Uranium-Total 285 282 220 - 321 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Uranium-Total 261.3 282 220 - 321 Acceptable Uranium-Total ERA 4th/2019 11/19/19 MRAD-31 Water µg/L (mass) 424 411 333 - 466 Acceptable Uranium-Total ERA 4th/2019 11/19/19 MRAD-31 Water µg/L (mass) 353 411 333 - 466 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Zinc-65 1490 1370 1220 - 1730 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Gross Alpha 147 124 45.3 - 171 Acceptable ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Gross Beta 72.9 68 34.0 - 93.6 Acceptable 16800 -

ERA 4th/2019 11/19/19 MRAD-31 Water pCi/L Tritium 20900 22300 27100 Acceptable Page 30 of 52

FIGURE 1 COBALT-60 PERFORMANCE EVALUATION RESULTS AND % BIAS 2019 Cobalt-60 Performance Evaluation Results and % Bias 100.0 75.0 50.0 Co-60 25.0 Lower

% Bias 0.0 Control Limit Upper

-25.0 Control Limit

-50.0

-75.0

-100.0 January 2019- December 2019 Page 31 of 52

FIGURE 2 CESIUM-137 PERFORMANCE EVALUATION RESULTS AND % BIAS 2019 Cesium-137 Performance Evaluation Results and % Bias 100.0 75.0 50.0 Cs-137 25.0 Lower

% Bias 0.0 Control Limit Upper

-25.0 Control Limit

-50.0

-75.0

-100.0 January 2019- December 2019 Page 32 of 52

FIGURE 3 TRITIUM PERFORMANCE EVALUATION RESULTS AND % BIAS 2019 Tritium Performance Evaluation Results and % Bias 100.0 75.0 50.0 H3 25.0

% Bias Lower 0.0 Control Limit Upper

-25.0 Control Limit

-50.0

-75.0

-100.0 January 2019- December 2019 Page 33 of 52

FIGURE 4 STRONTIUM-90 PERFORMANCE EVALUATION RESULTS AND % BIAS 2019 Strontium-90 Performance Evaluation Results and % Bias 100.0 50.0 Sr-90 Lower

% Bias 0.0 Control Limit Upper Control Limit

-50.0

-100.0 January 2019 - December 2019 Page 34 of 52

FIGURE 5 GROSS ALPHA PERFORMANCE EVALUATION RESULTS AND % BIAS 2019 Gross Alpha Performance Evaluation Results and % Bias 100.0 50.0 Gross Alpha

% Bias Lower 0.0 Control Limit Upper Control Limit

-50.0

-100.0 January 2019 - December 2019 Page 35 of 52

FIGURE 6 GROSS BETA PERFORMANCE EVALUATION RESULTS AND % BIAS 2019 Gross Beta Performance Evaluation Results and % Bias 100.0 50.0 Gross Beta

% Bias Upper 0.0 Control Limit Lower Control Limit

-50.0

-100.0 January 2019 - December 2019 Page 36 of 52

FIGURE 7 IODINE-131 PERFORMANCE EVALUATION RESULTS AND % BIAS 2019 Iodine-131 Performance Evaluation Results and % Bias 100.0 75.0 50.0 25.0 I-131

% Bias 0.0 Upper Limit Lower Limit

-25.0

-50.0

-75.0

-100.0 January 2019- December 2019 Page 37 of 52

FIGURE 8 AMERICIUM-241 PERFORMANCE EVALUATION RESULTS AND % BIAS 2019 Americium-241 Performance Evaluation Results and % Bias 100.0 75.0 50.0 Am-241 25.0

% Bias Lower 0.0 Control Limit Upper

-25.0 Control Limit

-50.0

-75.0

-100.0 January 2019- December 2019 Page 38 of 52

FIGURE 9 PLUTONIUM-238 PERFORMANCE EVALUATION RESULTS AND % BIAS 2019 Plutonium-238 Performance Evaluation Results and % Bias 100.0 75.0 50.0 Plutonium-25.0 238 Lower

% Bias 0.0 Control Limit Upper

-25.0 Control Limit

-50.0

-75.0

-100.0 January 2019- December 2019 Page 39 of 52

TABLE 6 REMP INTRA-LABORATORY DATA

SUMMARY

BIAS AND PRECISION BY MATRIX Bias Criteria (+ / - 25%) Precision Criteria (Note 1)

WITHIN OUTSIDE WITHIN OUTSIDE 2019 Total All REMP Intra-Laboratory Data CRITERIA CRITERIA CRITERIA CRITERIA MILK Gas Flow Sr 2nd count 34 0 39 0 Gas Flow Total Strontium 20 0 21 0 Gamma Spec Liquid RAD A-013 with Ba, La 21 0 71 0 SOLID Gamma Spec Solid RAD A-013 9 0 13 0 LSC Nickel 63 5 0 5 0 Gas Flow Sr 2nd count 4 0 7 0 Gas Flow Total Strontium 4 0 4 0 Gamma Spec Solid RAD A-013 with Iodine 16 0 37 0 FILTER Gas Flow Sr 2nd Count 5 0 5 0 Gross A & B 462 0 333 0 Gas Flow Sr-90 1 0 1 0 Gamma Spec Filter 34 0 76 0 LIQUID Alpha Spec Uranium 7 0 10 0 Tritium 169 0 225 0 LSC Iron-55 17 0 15 0 LSC Nickel 63 18 0 16 0 Gamma Iodine-131 19 0 19 0 Alpha Spec Plutonium 9 0 9 0 Gas Flow Sr 2nd count 6 0 5 0 Alpha Spec Am241 Curium 9 0 9 0 Gas Flow Total Strontium 11 0 9 0 Gross Alpha Non Vol Beta 28 0 55 0 Gamma Spec Liquid RAD A-013 with Ba, La 51 0 116 0 Gamma Spec Liquid RAD A-013 with Iodine 25 0 98 0 TISSUE Gamma Spec Solid RAD A-013 31 0 37 0 Gas Flow Sr 2nd count 7 0 7 0 Gas Flow Total Strontium 10 0 10 0 Gamma Spec Solid RAD A-013 with Iodine 13 0 14 0 VEGETATION Gamma Spec Solid RAD A-013 14 0 13 0 Gas Flow Sr 2nd count 8 0 8 0 Gamma Spec Solid RAD A-013 with Iodine 63 0 79 0 AIR CHARCOAL Carbon-14 (Ascarite/Soda Lime Filter per Liter) 25 0 25 0 DRINKING WATER Tritium 20 0 24 0 LSC Iron-55 14 0 16 0 LSC Nickel 63 14 0 16 0 Gamma Iodine-131 24 0 16 0 Page 40 of 52

Gas Flow Sr 2nd count 10 0 11 0 Gas Flow Total Strontium 13 0 15 0 Gross Alpha Non Vol Beta 52 0 61 0 Gamma Spec Liquid RAD A-013 with Ba, La 21 0 53 0 Gamma Spec Liquid RAD A-013 with Iodine 0 0 6 0 Total 1323 1609 Note 1: The RPD must be 20 percent or less, if both samples are greater than 5 times the MDC. If both results are less than 5 times MDC, then the RPD must be equal to or less than 100%. If one result is above the MDC and the other is below the MDC, then the RPD can be calculated using the MDC for the result of the one below the MDC. The RPD must be 100% or less. In the situation where both results are above the MDC but one result is greater than 5 times the MDC and the other is less than 5 times the MDC, the RPD must be less than or equal to 20%. If both results are below MDC, then the limits on % RPD are not applicable.

Page 41 of 52

TABLE 7 ALL RADIOLOGICAL INTRA-LABORATORY DATA

SUMMARY

BIAS AND PRECISION BY MATRIX:

Bias Criteria (+ / - 25%) Precision Criteria (Note 1)

WITHIN OUTSIDE WITHIN OUTSIDE 2019 Total All Intra-Laboratory Data CRITERIA CRITERIA CRITERIA CRITERIA MILK Gamma Spec Liquid RAD A-013 4 0 5 0 Gamma Iodine-129 4 0 4 0 Gamma Iodine-131 5 0 93 0 Gas Flow Sr 2nd count 34 0 39 0 Gas Flow Strontium 90 6 0 7 0 Gas Flow Total Strontium 20 0 21 0 Gamma Spec Liquid RAD A-013 with Ba, La 21 0 71 0 Gamma Spec Liquid RAD A-013 with Iodine 4 0 4 0 SOLID Gamma Percent Leach 2 0 0 0 Gas Flow Radium 228 72 0 76 0 Tritium 315 0 367 0 Tritium by Pyrolysis 2 0 3 0 Carbon-14 229 0 261 0 Carbon-14 by Pyrolysis 3 0 3 0 LSC Iron-55 132 0 145 0 Alpha Spec Polonium Solid 66 0 83 0 Gamma Nickel 59 RAD A-022 116 0 127 0 LSC Chlorine-36 in Solids 1 0 1 0 Gamma Spec Ra226 RAD A-013 15 0 17 0 Gamma Spec Solid RAD A-013 946 0 1312 0 LSC Nickel 63 226 0 239 0 LSC Plutonium 209 0 216 0 Technetium-99 526 0 561 0 Gross Alpha Beta Soil Leach 24 0 29 0 ICP-MS Technetium-99 in Soil 7 0 6 0 LSC Selenium 79 10 0 12 0 Total Activity, 9 0 10 0 Tritium 29 0 29 0 Alpha Spec Am243 87 0 94 0 Gamma Iodine-129 142 0 164 0 Gas Flow Lead 210 13 0 14 0 Alpha Spec Uranium 551 0 628 0 LSC Promethium 147 4 0 4 0 LSC, Rapid Strontium 89 and 90 51 0 58 0 Alpha Spec Thorium 429 0 491 0 ICP-MS Uranium-233, 234 in Solid 99 0 100 0 LSC Sulfur 35 5 0 5 0 Alpha Spec Plutonium 510 0 497 0 ICP-MS Technetium-99 Prep in Soil 7 0 6 0 LSC Calcium 45 0 0 2 0 Alpha Spec Neptunium 383 0 392 0 Page 42 of 52

Alpha Spec Plutonium 129 0 145 0 Alpha Spec Radium 226 34 0 43 0 Gas Flow Sr 2nd count 31 0 36 0 Gas Flow Strontium 90 316 0 297 0 Lucas Cell Radium 226 165 0 193 0 Total Activity Screen 1 0 1 0 Alpha Spec Am241 Curium 395 0 400 0 LSC Phosphorus-32 1 0 1 0 Alpha Spec Total Uranium 11 0 12 0 Gas Flow Total Strontium 75 0 76 0 ICP-MS Uranium-233, 234 Prep in Solid 99 0 103 0 ICP-MS Uranium-235, 236, 238 in Solid 84 0 85 0 Alpha Spec Polonium Solid 5 0 5 0 Gamma Spec Solid RAD A-013 with Iodine 16 0 37 0 GFC Chlorine-36 in Solids 29 0 29 0 Gamma Spec Solid RAD A-013 (pCi/Sample) 1 0 4 0 Tritium 5 0 5 0 Calculation for Percent Uranium and Ratios 2 0 0 0 ICP-MS Uranium-234, 235, 236, 238 in Solid 189 0 182 0 ICP-MS Uranium-235, 236, 238 Prep in Solid 81 0 85 0 Gross Alpha/Beta (Am/Cs Calibration) Solid 5 0 6 0 Gross Alpha/Beta 445 0 597 0 Gross Alpha/Beta (Americium Calibration)

Solid 3 0 3 0 ICP-MS Uranium-234, 235, 236, 238 Prep in Solid 107 0 106 0 Gross Alpha Beta (F,U) 37 0 45 0 FILTER Alpha Spec Uranium 4 0 22 0 Alpha Spec Polonium 3 0 4 0 Gamma I-131, filter 4 0 4 0 LSC Plutonium Filter 59 0 91 0 Tritium 31 0 265 0 Alpha Spec Californium 1 0 1 0 Carbon-14 6 0 70 0 ICP-MS Tc-99 in Filter 0 0 4 0 Nickel-63 1 0 47 0 LSC Iron-55 42 0 68 0 Gamma Nickel 59 RAD A-022 56 0 84 0 Alpha Spec Californium FPL 4 0 14 0 Gamma Iodine 131 RAD A-013 3 0 3 0 LSC Nickel 63 46 0 73 0 Technetium-99 7 0 86 0 Gamma Spec Filter RAD A-013 111 0 181 0 ICP-MS Tc-99 Prep in Filter 0 0 4 0 Alphaspec Np Filter per Liter 16 0 22 0 Alphaspec Pu Filter per Liter 24 0 29 0 Gamma Iodine-129 4 0 54 0 Gross Alpha/Beta 0 0 115 0 Alpha Spec Am243 8 0 15 0 Alpha Spec Uranium 56 0 88 0 LSC Promethium 147 1 0 3 0 LSC, Rapid Strontium 89 and 90 55 0 77 0 Page 43 of 52

Alpha Spec Thorium 34 0 55 0 Gas Flow Radium 228 2 0 4 0 Alpha Spec Plutonium 70 0 123 0 ICP-MS Uranium-233, 234 in Filter 0 0 4 0 Alpha Spec Neptunium 43 0 69 0 Alpha Spec Plutonium 63 0 113 0 Alpha Spec Plutonium 12 0 12 0 Alpha Spec Polonium,(Filter/Liter) 0 0 3 0 Alpha Spec Radium 226 1 0 4 0 Alpha/Beta (Americium Calibration) 0 0 1 0 Carbon-14 (Soda Lime) 0 0 2 0 Gas Flow Sr 2nd Count 31 0 45 0 Gas Flow Strontium 90 67 0 101 0 Gas Flow Total Radium 2 0 2 0 LSC Plutonium 241 Filter per Liter 29 0 42 0 Lucas Cell Radium-226 1 0 1 0 Alpha Spec Am241Curium 100 0 158 0 Gas Flow Total Strontium 3 0 4 0 ICP-MS Uranium-233, 234 Prep in Filter 0 0 3 0 ICP-MS Uranium-235, 236, 238 in Filter 2 0 5 0 Total Activity in Filter, 0 0 6 0 Alphaspec Am241 Curium Filter per Liter 30 0 55 0 Tritium 79 0 105 0 GFC Chlorine-36 in Filters 0 0 3 0 Gamma Spec Filter RAD A-013 Direct Count 2 0 7 0 Carbon-14 24 0 40 0 GFC Chlorine-36 in Filters PL 3 0 3 0 Gross A & B (Americium Calibration) Liquid 5 0 31 0 Direct Count-Gross Alpha/Beta 78 0 0 0 Gross Alpha/Beta 26 0 39 0 ICP-MS Uranium-234, 235, 236, 238 in Filter 4 0 78 0 ICP-MS Uranium-235, 236, 238 Prep in Filter 2 0 7 0 Alpha Spec U 25 0 64 0 Gross A & B 514 0 388 0 LSC Iron-55 6 0 10 0 Technetium-99 24 0 41 0 Gas Flow Sr-90 28 0 47 0 LSC Nickel 63 29 0 37 0 Gamma Spec Charcoal 9 0 11 0 Gas Flow Pb-210 20 0 38 0 Gas Flow Ra-228 22 0 35 0 Gross Alpha Beta (Flame, Unflame) 9 0 9 0 Direct Count- Alpha/Beta (Americium Calibration) 20 0 0 0 Gamma Iodine 129 29 0 29 0 ICP-MS Uranium-234, 235, 236, 238 Prep in Filter 2 0 39 0 Gamma Spec Filter 87 0 142 0 Lucas Cell Ra-226 16 0 25 0 Alpha Spec Thorium 18 0 31 0 LIQUID Alpha Spec Uranium 482 0 778 0 Alpha Spec Polonium 27 0 36 0 Page 44 of 52

Tritium 1142 0 1267 0 Carbon-14 167 0 204 0 Plutonium 128 0 147 0 Chlorine-36 in Liquids 3 0 3 0 Iodine-131 2 0 2 0 LSC Iron-55 85 0 135 0 Gamma Nickel 59 RAD A-022 28 0 40 0 Gamma Iodine 131 RAD A-013 2 0 2 0 LSC Nickel 63 144 0 188 0 LSC Radon 222 17 0 16 0 Technetium-99 555 0 657 0 Direct Tritium 1 0 1 0 Gamma Spec Liquid RAD A-013 794 0 899 0 Alpha Spec Total U RAD A-011 17 0 17 0 LSC Selenium 79 31 0 33 0 Total Activity, 3 0 4 0 Alpha Spec Am243 14 0 28 0 Gamma Iodine-129 128 0 169 0 Gamma Iodine-131 19 0 19 0 ICP-MS Technetium-99 in Water 5 0 11 0 Gas Flow Lead 210 14 0 41 0 LSC Promethium 147 18 0 19 0 LSC, Rapid Strontium 89 and 90 8 0 10 0 Alpha Spec Polonium 2 0 2 0 Alpha Spec Thorium 190 0 287 0 Gas Flow Radium 228 387 0 474 0 Gas Flow Radium 228 9 0 9 0 Alpha Spec Plutonium 346 0 508 0 LSC Sulfur 35 11 0 12 0 Alpha Spec Neptunium 135 0 233 0 Alpha Spec Plutonium 25 0 29 0 Alpha Spec Radium 226 28 0 31 0 Gas Flow Sr 2nd count 73 0 108 0 Gas Flow Strontium 90 489 0 550 0 Gas Flow Strontium 90 2 0 2 0 Gas Flow Total Radium 183 0 156 0 ICP-MS Technetium-99 Prep in Water 6 0 12 0 ICP-MS Uranium-233, 234 in Liquid 6 0 21 0 LSC Calcium 45 11 0 12 0 Lucas Cell Radium 226 309 0 450 0 Lucas Cell Radium-226 10 0 10 0 Chlorine-36 in Liquids 17 0 27 0 Alpha Spec Am241 Curium 305 0 433 0 Gas Flow Total Strontium 77 0 88 0 Gross Alpha Non Vol Beta 830 0 1183 0 LSC Phosphorus-32 8 0 10 0 ICP-MS Uranium-233, 234 Prep in Liquid 10 0 24 0 Tritium in Drinking Water by EPA 906.0 5 0 3 0 Gamma Spec Liquid RAD A-013 with Ba, La 51 0 124 0 Gamma Spec Liquid RAD A-013 with Iodine 101 0 188 0 Gas Flow Strontium 89 & 90 5 0 3 0 ICP-MS Uranium-235, 236, 238 in Liquid 13 0 25 0 Gas Flow Total Alpha Radium 10 0 10 0 Page 45 of 52

Gross Alpha Co-precipitation 4 0 7 0 ICP-MS Uranium-235, 236, 238 Prep in Liquid 9 0 24 0 Gross Alpha/Beta (Am/Cs Calibration) Liquid 2 0 2 0 Gross Alpha/Beta 0 0 3 0 ICP-MS Uranium-234, 235, 236, 238 in Liquid 170 0 172 0 Gross Alpha Beta (Flame, Unflame) 195 0 213 0 Gross Alpha Beta (Americium Calibration)

Liquid 33 0 72 0 ICP-MS Uranium-234, 235, 236, 238 Prep in Liquid 84 0 85 0 Alpha/Beta (Americium Calibration) Drinking Water 27 0 19 0 ECLS-R-GA NJ 48 Hr Rapid Gross Alpha 4 0 3 0 TISSUE Gamma Spec Solid RAD A-013 46 0 62 0 Alpha Spec Uranium 10 0 12 0 Alpha Spec Plutonium 6 0 6 0 Gas Flow Sr 2nd count 7 0 7 0 Gas Flow Strontium 90 9 0 11 0 Alpha Spec Am241 Curium 3 0 3 0 Gas Flow Total Strontium 10 0 10 0 Gamma Spec Solid RAD A-013 with Iodine 13 0 14 0 Gross Alpha/Beta 1 0 2 0 VEGETATION Carbon-14 4 0 4 0 Gamma Spec Solid RAD A-013 42 0 30 0 Gas Flow Lead 210 1 0 3 0 Alpha Spec Uranium 29 0 21 0 Alpha Spec Thorium 5 0 6 0 Alpha Spec Plutonium 27 0 14 0 Gas Flow Sr 2nd count 8 0 8 0 Gas Flow Strontium 90 24 0 11 0 Gas Flow Total Radium 1 0 3 0 Lucas Cell Radium 226 1 0 1 0 Alpha Spec Am241 Curium 5 0 8 0 Gamma Spec Solid RAD A-013 with Iodine 63 0 79 0 Gamma Spec Solid RAD A-013 (pCi/Sample) 2 0 2 0 Alpha Spec Am241 (pCi/Sample) 1 0 2 0 Alpha Spec Uranium 1 0 2 0 Gross Alpha/Beta 3 0 3 0 Alpha Spec Plutonium 0 0 2 0 Gas Flow Strontium 90 4 0 2 0 AIR CHARCOAL Gamma Iodine-129 25 0 8 0 Carbon-14 (Soda Lime) 0 0 5 0 Carbon-14 12 0 12 0 Carbon-14 (Ascarite/Soda Lime Filter per Liter) 28 0 29 0 Gamma Spec Charcoal 12 0 12 0 Gamma Iodine 129 12 0 12 0 Page 46 of 52

DRINKING WATER Alpha Spec Uranium 2 0 2 0 Tritium 21 0 25 0 Iodine-131 0 0 1 0 LSC Iron-55 14 0 16 0 LSC Nickel 63 14 0 16 0 LSC Radon 222 31 0 39 0 Gamma Spec Liquid RAD A-013 7 0 6 0 Gamma Iodine-129 1 0 2 0 Gamma Iodine-131 24 0 16 0 Gas Flow Radium 228 35 0 33 0 Gas Flow Sr 2nd count 10 0 11 0 Gas Flow Strontium 90 17 0 16 0 Gas Flow Total Radium 1 0 1 0 Lucas Cell Radium 226 1 0 0 0 Lucas Cell Radium-226 36 0 37 0 Gamma Spec Drinking Water RAD A-013 29 0 36 0 Gas Flow Total Strontium 13 0 15 0 Gross Alpha Non Vol Beta 142 0 151 0 Tritium in Drinking Water by EPA 906.0 30 0 32 0 Gamma Spec Liquid RAD A-013 with Ba, La 21 0 53 0 Gamma Spec Liquid RAD A-013 with Iodine 0 0 6 0 Gas Flow Strontium 89 & 90 20 0 14 0 Gas Flow Total Alpha Radium 1 0 1 0 ICP-MS Uranium-234, 235, 236, 238 in Liquid 2 0 2 0 ICP-MS Uranium-234, 235, 236, 238 Prep in Liquid 1 0 1 0 Alpha/Beta (Americium Calibration) Drinking Water 10 0 10 0 ECLS-R-GA NJ 48 Hr Rapid Gross Alpha 19 0 16 0 Total 18630 23501 Note 1: The RPD must be 20 percent or less, if both samples are greater than 5 times the MDC. If both results are less than 5 times MDC, then the RPD must be equal to or less than 100%. If one result is above the MDC and the other is below the MDC, then the RPD can be calculated using the MDC for the result of the one below the MDC. The RPD must be 100% or less. In the situation where both results are above the MDC but one result is greater than 5 times the MDC and the other is less than 5 times the MDC, the RPD must be less than or equal to 20%. If both results are below MDC, then the limits on % RPD are not applicable.

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TABLE 8 2019 CORRECTIVE ACTION REPORT

SUMMARY

CORRECTIVE ACTION ID#

& DISPOSITION PE FAILURE CARR190225-1192 Root Cause Analysis ISO Documentation of PT Failures in RAD Strontium-89 in Drinking Water by EPA 905.0 and 905.0 Mod.

116 for Strontium-89.

A review of the data as well as the preparation processes did not reveal any errors or possible contributors to the high bias. The Laboratory has concluded that this positive bias was an isolated occurrence and that our overall process is within control. In addition, the reported value is 117% of the reference value which is within the laboratorys standard acceptance criteria of +/- 25% for Laboratory Control Samples.

Permanent Corrective/Preventive Actions or Improvements The laboratory must assume unidentified random errors caused the biases because all quality control criteria were met for the batches.

The laboratory will continue to monitor CARR190530-1211 Root Cause Analysis ISO Documentation of PT Failures in Upon receipt of the report, an investigation was initiated by our MRAD-30 for: Quality Department and a Corrective Action (CARR) team Uranium-238 by 6020 (in soil) assembled. The team consisted of representatives from the affected Sr-90 (in vegetation) areas. The sample preparation and analytical processes were Pu-238 (in vegetation) reviewed. This included review of reagents and standards used in Uranium-238 (in vegetation) the sample preparation steps, calibration records, process control Uranium-Total (in vegetation) samples, instruments used during analysis and interviews with the analysts.

The investigation determined that the laboratory met all quality control criteria specified in the methods. Additionally, all internal procedures and processes were evaluated and found to have been performed as required. These failures were tracked through GELs internal non-conformance system.

Additionally, trending of historical PT samples for these isotope/matrix/methods were conducted. Specific tendencies of failures were not observed.

Uranium-238 by 6020: Per the method an acid leach is used instead of a more aggressive total dissolution that other methods use. This method is not the laboratorys standard method of choice for the analysis of Uranium-238.

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Permanent Corrective/Preventive Actions or Improvements The laboratory does not use this digestion method for this isotope and therefore will discontinue analyzing and reporting a PT by using this method.

Sr-90: A reanalysis for Strontium for the Vegetation sample was performed using a larger aliquot. The reanalysis was performed using the same processes as the original reported analysis. The reanalysis result meets the acceptance range with 96% recovery.

Permanent Corrective/Preventive Actions or Improvements None at this time. A reanalysis was performed and results were within acceptance limits. The laboratory will continue to monitor the recoveries of these parameters to ensure that there are no continued issues in the processes Pu-238: A reanalysis for Plutonium for the Vegetation sample was performed using approximately the same size aliquot. Prior to the analysis, the sample was shaken and stirred vigorously to ensure homogenization. Reanalysis values fell within the acceptability range for all Plutonium isotopes. It is noted that the Pu-238 count rate is low (0.05 cpm) which results in an uncertainty of 32% at the 95% confidence interval, even with a long count time of 1000 minutes. The reported Pu-238 result is 116% of the study mean and the Z score is less than 1. Failure was potentially due to high uncertainty due to low count rates for the Pu-238, as well as a possible homogeneity issue Permanent Corrective/Preventive Actions or Improvements None at this time. A reanalysis was performed and results were within acceptance limits. The laboratory will continue to monitor the recoveries of these parameters to ensure that there are no continued issues in the processes U-238/Total U mass: A reanalysis for Uranium for the Vegetation sample was performed using approximately the same size aliquot. Prior to the analysis, the sample was shaken and stirred vigorously to ensure homogenization. Reanalysis values fell within the acceptability range for all Uranium isotopes. The original Uranium results were 126% (for U-234) and 129% (for U-238) of the assigned value, yet the Z-scores were both less than 1 and the results were 106% and 108% of the study mean. Additionally, the U-238 value fails, while the Total Uranium value in Activity units (which is simply a calculation) passes, and the Total Uranium in mass units (simply a conversion from the activity results) fails. Failures were potentially due to a possible homogeneity issue.

Permanent Corrective/Preventive Actions or Improvements None at this time. A reanalysis was performed and results were within acceptance limits. The laboratory will continue to monitor the recoveries of these parameters to ensure that there are no continued issues in the processes.

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CORRECTIVE ACTION ID#

& DISPOSITION PE FAILURE CARR190603-1212 Root Cause Analysis ISO Documentation of PT Failures in Upon receipt of the report, an investigation was initiated by our MAPEP-19-MaS40: Quality Department and a Corrective Action (CARR) team Fe-55 assembled. The team consisted of representatives from the affected areas. The sample preparation and analytical processes were reviewed. This included review of reagents and standards used in the sample preparation steps, calibration records, process control samples, instruments used during analysis and interviews with the analysts.

The investigation determined that the laboratory met all quality control criteria specified in the methods. Additionally, all internal procedures and processes were evaluated and found to have been performed as required. These failures were tracked through GELs internal non-conformance system.

Iron-55: In reviewing the data, it was found that too small of an aliquot was used in the original analysis resulting in a high uncertainty in the result and variance or results between counts. A larger aliquot was used during reanalysis and the result was within the acceptance range and had a lower uncertainty.

Permanent Corrective/Preventive Actions or Improvements None at this time. A reanalysis was performed and results were within acceptance limits. The laboratory will continue to monitor the recoveries of these parameters to ensure that there are no continued issues in the processes.

CARR190826-1250 Root Cause Analysis ISO Documentation of PT Failures in Upon receipt of the report, an investigation was initiated by our RAD-118 Quality Department and a Corrective Action (CARR) team Sr-89 assembled. The team consisted of representatives from the affected Gross Alpha areas. The sample preparation and analytical processes were reviewed. This included review of reagents and standards used in the sample preparation steps, calibration records, process control samples, instruments used during analysis and interviews with the analysts.

The investigation determined that the laboratory met all quality control criteria specified in the methods. Additionally, all internal procedures and processes were evaluated and found to have been performed as required. These failures were tracked through GELs internal non-conformance system.

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Strontium-89: A review of the data as well as the preparation processes did not reveal any errors or possible contributors to the high bias. In addition, the reported value is 118% of the reference value which is with the laboratorys standard acceptance criteria of

+/- 25% for Laboratory Control Samples.

In addition, the Sr-89 was also reported by a method using separation resin and the result was with the acceptance range. The results from the two methods compared with a relative percent difference (RPD) of 11.1% which meets the laboratorys duplicate acceptance criteria.

Gross Alpha: The analysis data was reviewed and no errors were found. The investigation into the sample preparation did not result in any contributors to the high bias. This analysis was performed by Co-Precipitation.

The laboratory also reported the gross alpha analysis by the evaporation method (EPA 900.0) and had an acceptable result. The laboratorys alpha results between the two methods compared with a relative percent difference (RPD) of 9.45% which meets the laboratorys duplicate acceptance criteria.

Permanent Corrective/Preventive Actions or Improvements The Laboratory has concluded that these positive biases were isolated occurrences and that the overall process is within control. The lab will complete PT studies for these parameters as they become available to verify that these were isolated incidences.

CARR191212-1262 Root Cause Analysis ISO Documentation of PT Failures in Upon receipt of the report, an investigation was initiated by our MRAD-31 Quality Department and a Corrective Action (CARR) team Pb-212 assembled. The team consisted of representatives from the affected areas. The sample preparation and analytical processes were reviewed. This included review of reagents and standards used in the sample preparation steps, calibration records, process control samples, instruments used during analysis and interviews with the analysts.

The investigation determined that the laboratory met all quality control criteria specified in the methods. Additionally, all internal procedures and processes were evaluated and found to have been performed as required. These failures were tracked through GELs internal non-conformance system.

Lead-212: The data was reviewed and no anomalies noted. The Duplicate result of the original analysis met the acceptance criteria of the study and replication criteria of the laboratory. Laboratory processes were evaluated and no errors were found. The other reported analytes for the method were within the limits of the study.

A definitive contributor to the slightly high bias could not be identified concluding that this was an isolated occurrence.

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Permanent Corrective/Preventive Actions or Improvements None at this time. The laboratory will continue to monitor the recoveries of these parameters to ensure that there are no continued issues in the processes CARR191212-1265 Root Cause Analysis ISO Documentation of PT Failures in Upon receipt of the report, an investigation was initiated by our MAPEP-19-MaW41 Quality Department and a Corrective Action (CARR) team Ra-226 assembled. The team consisted of representatives from the affected laboratory areas. The sample preparation and analytical processes were reviewed. This included review of reagents and standards used in the sample preparation steps, calibration records, process control samples, and interviews with the analysts.

The investigation determined that the laboratory met all quality control criteria specified in each method. Additionally, all internal procedures and policies were performed as required. These failures were tracked through GELs internal non-conformance system.

The laboratory reviewed the data and no errors were found. The preparation and counting processes were reviewed and no anomalies were noted. It was noted that verification counts of the sample preparations were within limits and met laboratory replication criteria Permanent Corrective/Preventive Actions or Improvements None at this time. The laboratory will continue to monitor the recoveries of these parameters to ensure that there are no continued issues in the processes Page 52 of 52

APPENDIX B 2019 ANNUAL DOSIMETRY QA REPORT

TABLE OF CONTENTS Page LIST OF TABLES ....................................................................................................................... iii EXECUTIVE

SUMMARY

............................................................................................................ iv I. INTRODUCTION ............................................................................................................ 1 A. QC Program........................................................................................................ 1 B. QA Program ........................................................................................................ 1 II. PERFORMANCE EVALUATION CRITERIA ................................................................... 1 A. Acceptance Criteria for Internal Evaluations........................................................ 1 B. QC Investigation Criteria and Result Reporting ................................................... 3 C. Reporting of Environmental Dosimetry Results to EDC Customers ..................... 3 III. DATA

SUMMARY

FOR ISSUANCE PERIOD JANUARY-DECEMBER 2019 ................. 3 A. General Discussion ............................................................................................. 3 B. Result Trending .................................................................................................. 4 IV. STATUS OF EDC CONDITION REPORTS (CR) ........................................................... 4 V. STATUS OF AUDITS/ASSESSMENTS .......................................................................... 4 A. Internal................................................................................................................ 4 B. External .............................................................................................................. 4 VI. PROCEDURES AND MANUALS REVISED DURING JANUARY - DECEMBER 2019 ... 4 VII. CONCLUSION AND RECOMMENDATIONS ................................................................. 4 VIII. REFERENCES ............................................................................................................... 4 APPENDIX A DOSIMETRY QUALITY CONTROL TRENDING GRAPHS

-ii-

LIST OF TABLES Page

1. Percentage of Individual Analyses Which Passed EDC Internal Criteria, January - December 2019 5

2. Mean Dosimeter Analyses (n=6), January - December 2019 5

3. Summary of Independent QC Results for 2019 5

-iii-

EXECUTIVE

SUMMARY

Routine quality control (QC) testing was performed for dosimeters issued by the Environmental Dosimetry Company (EDC) .

During this annual period100% (72/72) of the individual dosimeters, evaluated against the EDC internal performance acceptance criteria (high-energy photons only), met the criterion for accuracy and 100% (72/72) met the criterion for precision (Table 1). In addition, 100% (12/12) of the dosimeter sets evaluated against the internal tolerance limits met EDC acceptance criteria (Table 2) and 100% (6/6) of independent testing passed the performance criteria (Table 3). Trending graphs, which evaluate performance statistic for high-energy photon irradiations and co-located stations are given in Appendix A.

One internal assessment and one external audit were performed in 2019.There were no findings identified.

-iv-

I. INTRODUCTION The TLD systems at the Environmental Dosimetry Company (EDC) are calibrated and operated to ensure consistent and accurate evaluation of TLDs. The quality of the dosimetric results reported to EDC clients is ensured by in-house performance testing and independent performance testing by EDC clients, and both internal and client directed program assessments.

The purpose of the dosimetry quality assurance program is to provide performance documentation of the routine processing of EDC dosimeters. Performance testing provides a statistical measure of the bias and precision of dosimetry processing against a reliable standard, which in turn points out any trends or performance changes. Two programs are used:

A. QC Program Dosimetry quality control tests are performed on EDC Panasonic 814 Environmental dosimeters. These tests include: (1) the in-house testing program coordinated by the EDC QA Officer and (2) independent test perform by EDC clients. In-house test are performed using six pairs of 814 dosimeters, a pair is reported as an individual result and six pairs are reported as the mean result.Results of these tests are described in this report.

Excluded from this report are instrumentation checks. Although instrumentation checks represent an important aspect of the quality assurance program, they are not included as process checks in this report. Instrumentation checks represent between 5-10% of the TLDs processed.

B. QA Program An internal assessment of dosimetry activities is conducted annually by the Quality Assurance Officer (Reference 1). The purpose of the assessment is to review procedures, results, materials or components to identify opportunities to improve or enhance processes and/or services.

II. PERFORMANCE EVALUATION CRITERIA A. Acceptance Criteria for Internal Evaluations

1. Bias For each dosimeter tested, the measure of bias is the percent deviation of the reported result relative to the delivered exposure. The percent deviation relative to the delivered exposure is calculated as follows:

Hi Hi 100 Hi where:

Hi = the corresponding reported exposure for the ith dosimeter (i.e., the reported exposure)

Hi = the exposure delivered to the ith irradiated dosimeter (i.e., the delivered exposure) 1 of 6

2. Mean Bias For each group of test dosimeters, the mean bias is the average percent deviation of the reported result relative to the delivered exposure. The mean percent deviation relative to the delivered exposure is calculated as follows:

Hi Hi 1 100 Hi n where:

Hi = the corresponding reported exposure for the ith dosimeter (i.e., the reported exposure)

Hi = the exposure delivered to the ith irradiated test dosimeter (i.e., the delivered exposure) n = the number of dosimeters in the test group

3. Precision For a group of test dosimeters irradiated to a given exposure, the measure of precision is the percent deviation of individual results relative to the mean reported exposure. At least two values are required for the determination of precision. The measure of precision for the ith dosimeter is:

Hi H 100 H

where:

Hi = the reported exposure for the ith dosimeter (i.e., the reported exposure) 1 H = the mean reported exposure; i.e., H Hi n

n = the number of dosimeters in the test group

4. EDC Internal Tolerance Limits All evaluation criteria are taken from the EDC Quality System Manual, (Reference 2). These criteria are only applied to individual test dosimeters irradiated with high-energy photons (Cs-137) and are as follows for Panasonic Environmental dosimeters: +/- 15% for bias and +/-

12.8% for precision.

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B. QC Investigation Criteria and Result Reporting EDC Quality System Manual (Reference 2) specifies when an investigation is required due to a QC analysis that has failed the EDC bias criteria. The criteria are as follows:

1. No investigation is necessary when an individual QC result falls outside the QC performance criteria for accuracy.

2. Investigations are initiated when the mean of a QC processing batch is outside the performance criterion for bias.

C. Reporting of Environmental Dosimetry Results to EDC Customers

1. All results are to be reported in a timely fashion.

2. If the QA Officer determines that an investigation is required for a process, the results shall be issued as normal. If the QC results prompting the investigation have a mean bias from the known of greater than +/-20%, the results shall be issued with a note indicating that they may be updated in the future, pending resolution of a QA issue.

3. Environmental dosimetry results do not require updating if the investigation has shown that the mean bias between the original results and the corrected results, based on applicable correction factors from the investigation, does not exceed +/-20%.

III. DATA

SUMMARY

FOR ISSUANCE PERIOD JANUARY-DECEMBER 2019 A. General Discussion Results of performance tests conducted are summarized and discussed in the following sections. Summaries of the performance tests for the reporting period are given in Tables 1 through 3 and Figures 1 through 4.

Table 1 provides a summary of individual dosimeter results evaluated against the EDC internal acceptance criteria for high-energy photons only. During this period100% (72/72) of the individual dosimeters, evaluated against these criteria, met the tolerance limits for accuracy and 100% (72/72) met the criterion for precision. A graphical interpretation is provided in Figures 1 and 2.

Table 2 provides the bias and standard deviation results for each group (N=6) of dosimeters evaluated against the internal tolerance criteria. Overall,100% (12/12) of the dosimeter sets, evaluated against the internal tolerance performance criteria, met these criteria. A graphical interpretation is provided in Figure 3.

Table 3 presents the independent blind spike results for dosimeters processed during this annual period. All results passed the performance acceptance criterion. Figure 4 is a graphical interpretation of Seabrook Station blind co-located station results.

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B. Result Trending One of the main benefits of performing quality control tests on a routine basis is to identify trends or performance changes. The results of the Panasonic environmental dosimeter performance tests are presented in Appendix A. The results are evaluated against each of the performance criteria listed in Section II, namely: individual dosimeter accuracy, individual dosimeter precision, and mean bias.

All of the results presented in Appendix A are plotted sequentially by processing date.

IV. STATUS OF EDC CONDITION REPORTS (CR)

No condition reports were issued during this annual period.

V. STATUS OF AUDITS/ASSESSMENTS

1. Internal EDC Internal Quality Assurance Assessment was conducted during the fourth quarter 2019. There were no findings identified.

2. External None.

VI. PROCEDURES AND MANUALS REVISED DURING JANUARY - DECEMBER 2019 No procedures or manuals were revised in 2019.

VII. CONCLUSION AND RECOMMENDATIONS The quality control evaluations continue to indicate the dosimetry processing programs at the EDC satisfy the criteria specified in the Quality System Manual. The EDC demonstrated the ability to meet all applicable acceptance criteria.

VIII. REFERENCES

1. EDC Quality Control and Audit Assessment Schedule, 2019.

2. EDC Manual 1, Quality System Manual, Rev. 3, August 1, 2017.

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TABLE 1 PERCENTAGE OF INDIVIDUAL DOSIMETERS THAT PASSED EDC INTERNAL CRITERIA JANUARY - DECEMBER 2019(1), (2)

Number  % Passed Precision Dosimeter Type  % Passed Bias Criteria Tested Criteria Panasonic Environmental 72 100 100 (1)

This table summarizes results of tests conducted by EDC.

(2)

Environmental dosimeter results are free in air.

TABLE 2 MEAN DOSIMETER ANALYSES (N=6)

JANUARY - DECEMBER 2019(1), (2)

Standard Tolerance Process Date Exposure Level Mean Bias % Deviation Limit +/-

% 15%

4/25/2019 26 1.8 1.7 Pass 4/29/2019 51 3.1 1.5 Pass 5/04/2019 85 -0.4 1.4 Pass 7/28/2019 75 5.9 1.1 Pass 7/30/2019 32 2.8 1.2 Pass 8/4/2019 107 -0.7 1.2 Pass 10/25/2019 64 1.8 1.2 Pass 11/04/2019 90 -0.5 1.8 Pass 11/05/2019 117 3.0 1.7 Pass 01/20/2020 45 1.0 2.0 Pass 01/30/2020 57 1.8 2.6 Pass 02/17/2020 121 -2.6 2.4 Pass (1)

This table summarizes results of tests conducted by EDC for TLDs issued in 2019.

(2)

Environmental dosimeter results are free in air.

TABLE 3

SUMMARY

OF INDEPENDENT DOSIMETER TESTING JANUARY - DECEMBER 2019(1), (2)

Standard Pass / Fail Issuance Period Client Mean Bias %

Deviation %

1st Qtr. 2019 Millstone 0.6 2.6 Pass 2nd Qtr.2019 Seabrook 7.8 2.0 Pass 3rd Qtr. 2019 SONGS 0.1 2.4 Pass 3rd Qtr. 2019 Millstone 1.1 1.9 Pass 4th Qtr.2019 PSEG(PNNL) -3.2 0.9 Pass 4th Qtr.2019 Seabrook 0.9 1.0 Pass (1)

Performance criteria are +/- 15%.

(2)

Blind spikeirradiations using Cs-137 5 of 6

APPENDIX A DOSIMETRY QUALITY CONTROL TRENDING GRAPHS ISSUE PERIOD JANAURY - DECEMBER 2019 6 of 6