Text

2018 Annual Radiological Environmental Operating Report (AREOR)
	ML19136A181
Person / Time
Site:	Oconee
Issue date:	05/15/2019
From:	Fisk P; Duke Energy Carolinas
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	RA-19-0226
	Download: ML19136A181 (179)
	v • d • e

( ~ DUKE Paul V. Fisk Plant Manager ENERGY Oconee Nuclear Station Duke Energy ON01VP I 7800 Rochester Hwy Seneca, SC 29672 o 864.873.6413 r 864.873.4208 Paul. Fisk@duke-energy.com RA-19-0226 May 15, 2019 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555

Subject:

Duke Energy Carolinas, LLC Oconee Nuclear Station, Units 1, 2 and 3 Docket Nos. 50-269, 50-270 and 50-287 2018 Annual Radiological Environmental Operating Report (AREOR)

Pursuant to Oconee Nuclear Station Technical Specification 5.6.2 and Selected Licensee Commitment 16.11 .10, please find the enclosed 2018 Annual Radiological Environmental Operating Report. This report covers operation of Units 1, 2 and 3 during the 2018 calendar year.

Any questions concerning this report may be directed to Samuel Adams, Oconee Regulatory Affairs at 864-873-3348 .

Sincerely,

~ Paul V. Fisk Plant Manager Oconee Nuclear Station Enclosure

U.S. Nuclear Regulatory Commission 2018 Annual Radiological Environmental Operating Report May 15, 2019 Page2 xc (with enclosure):

Ms. Catherine Haney Administrator, Region II U.S. Nuclear Regulatory Commission Marquis One Tower 245 Peachtree Center Ave., NE, Suite 1200 Atlanta, GA 30303-1257 Mr. Adam Ruh NRC Senior Resident Inspector (Acting)

Oconee Nuclear Station Ms. Audrey Klett, Project Manager

U.S. Nuclear Regulatory Commission 11555 Rockville Pike Mail Stop OWFN/8G-9A Rockville, MD 20852 Ms. Lynne Garner, Manager Radioactive & Infectious Waste Management SC Department. of Health and Environmental Control 2600 Bull St.

Columbia, SC 29201 Mr. Gary Stewart State Voluntary Cleanup Section S.C. Dept. of Health & Environmental Control 2600 Bull Street Columbia, SC 29201-1708 Ms. Anuradha Nair Gimmi, Manager Nuclear Response and Emergency Environmental Surveillance Division of Emergency Response S.C. Dept. of Health & Environmental Control 2600 Bull Street Columbia, SC 29201-1708

,/ ~ DUKE ENERGY ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT DUKE ENERGY CORPORATION OCONEE NUCLEAR STATION Units 1, 2, and 3 2018

TABLE OF CONTENTS 1.0 Executive Summary . . . . . . . . . . . . 1-1 2.0 Introduction . . . . . . . . . . . . . 2-1 2.1 Site Description and Sample Locations . . . . . . . 2-1 2.2 Scope and Requirements of the REMP . . . . . . . 2-1 2.3 Statistical and Calculational Methodology . . . . . . . 2-2 2.3.1 Estimation of the Mean Value . . . . . . . . 2-2 2.3.2 Lower Limit of Detection and Minimum Detectable Activity . . 2-3 2.3.3 Trend Identification . . . . . . . . . 2-3 3.0 Interpretation of Results . . . . . . . . . . . 3-1 3.1 Airborne Radioiodine and Particulates . . . . . . . 3-3 3.2 Drinking Water . . . . . . . . . . . . 3-7 3.3 Surface Water . . . . . . . . . . . . 3-11 3.4 Milk . . . . . . . . . . . . . . 3-14 3.5 Broadleaf Vegetation . . . . . . . . . . 3-17 3.6 Fish . . . . . . . . . . . . . . 3-19 3.7 Shoreline Sediment . . . . . . . . . . . 3-22 3.8 Direct Gamma Radiation . . . . . . . . . . 3-24 3.8.1 Environmental TLD . . . . . . . . . . 3-24 3.8.2 ISFSI . . . . . . . . . . . . 3-25 3.9 Land Use Census . . . . . . . . . . . 3-30 4.0 Evaluation of Dose . . . . . . . . . . . . 4-1 4.1 Dose from Environmental Measurements . . . . . . . 4-1 4.2 Estimated Dose from Releases . . . . . . . . . 4-1 4.3 Comparison of Doses . . . . . . . . . . 4-2 5.0 Quality Assurance . . . . . . . . . . . . 5-1 5.1 Sample Collection . . . . . . . . . . 5-1 5.2 Sample Analysis . . . . . . . . . . . 5-1 5.3 Dosimetry Analysis . . . . . . . . . . . 5-1 5.4 Laboratory Equipment Quality Assurance . . . . . . . 5-1 5.4.1 Daily Quality Control . . . . . . . . . 5-1 5.4.2 Calibration Verification . . . . . . . . . 5-1 5.4.3 Batch Processing . . . . . . . . . . 5-1 5.5 Duke Energy Interlaboratory Comparison Program . . . . . 5-2 5.5.1 Eckert & Ziegler Analytics Cross Check Program . . . . 5-2 5.6 Split Comparison Program . . . . . . . . . . 5-2 5.7 TLD Intercomparison Program . . . . . . . . . 5-2 5.7.1 Nuclear Technology Services Intercomparison Program . . . 5-2 5.7.2 Internal Cross Check (Duke Energy) . . . . . . . 5-2 5.8 General Engineering Laboratory, LLC (GEL) . . . . . . 5-3 Appendices Appendix A: Environmental Sampling & Analysis Procedures . . . . A-1 I. Change of Sampling Procedures . . . . . . . . . A-2 II. Description of Analysis Procedures . . . . . . . . A-2 III. Change of Analysis Procedures . . . . . . . . . A-3 IV. Sampling and Analysis Procedures . . . . . . . . A-3 A.1 Airborne Particulate and Radioiodine . . . . . . A-3 i

A.2 Drinking Water . . . . . . . . . . A-3 A.3 Surface Water . . . . . . . . . . . A-4 A.4 Milk . . . . . . . . . . . . A-4 A.5 Broadleaf Vegetation . . . . . . . . . A-4 A.6 Fish . . . . . . . . . . . . A-4 A.7 Shoreline Sediment . . . . . . . . . . A-4 A.8 Direct Gamma Radiation (TLD) . . . . . . . A-5 A.9 Annual Land Use Census . . . . . . . . . A-5 V. Global Positioning System (GPS) Analysis . . . . . . . A-5 Appendix B: Radiological Environmental Monitoring Program - Summary of Results . B-1 Air Particulate . . . . . . . . . . . . B-2 Air Radioiodine. . . . . . . . . . . . B-2 Drinking Water . . . . . . . . . . . . B-2 Surface Water . . . . . . . . . . . . B-2 Milk . . . . . . . . . . . . . . B-2 Broadleaf Vegetation . . . . . . . . . . B-3 Fish . . . . . . . . . . . . . . B-3 Shoreline Sediment . . . . . . . . . . . B-3 Direct Gamma Radiation (TLD) . . . . . . . . B-3 Appendix C: Sampling Deviations & Unavailable Analyses . . . . . C-1 C.1 Sampling Deviations . . . . . . . . . . C-2 C.2 Unavailable Analyses . . . . . . . . . . C-3 Appendix D: Analytical Deviations . . . . . . . . . . D-1 Appendix E: Radiological Environmental Monitoring Program Results . . . E-1 Appendix F: Errata to Previous Reports . . . . . . . . . F-1 LIST OF FIGURES 2.1-1 Oconee Nuclear Station Sampling Locations Map (One Mile Radius). . . 2-4 2.1-2 Oconee Nuclear Station Sampling Locations Map (Ten Mile Radius) . . 2-5 3.1 Concentration of Gross Beta in Air Particulate . . . . . . 3-6 3.2-1 Concentration of Gross Beta in Drinking Water . . . . . . 3-8 3.2-2 Concentration of Tritium in Drinking Water . . . . . . 3-8 3.3 Concentration of Tritium in Surface Water . . . . . . . 3-11 3.5 Concentration of Cs-137 in Broadleaf Vegetation . . . . . 3-17 3.6-1 Concentration of Cs-137 in Fish . . . . . . . . 3-20 3.6-2 Concentration of Cs-134 in Fish . . . . . . . . 3-20 3.7 Concentration of Cs-137 in Shoreline Sediment . . . . . . 3-22 3.8 Direct Gamma Radiation (TLD) Results . . . . . . . 3-26 3.9 Oconee Nuclear Station 2018 Land Use Census Map . . . . . 3-31 LIST OF TABLES 2.1-A Oconee Radiological Monitoring Program Sampling Locations . . . 2-6 2.1-B Oconee Radiological Monitoring Program Sampling Locations (TLD Sites) 2-7 2.2-A Reporting Levels for Radioactivity Concentrations in Environmental Samples . . . . . . . . . . 2-8 2.2-B REMP Analysis Frequency . . . . . . . . . 2-8 2.2-C Maximum Values for the A PRIORI Lower Limits of Detection . . . 2-9 3.1-A Mean Concentration of Air Radioiodine (I-131) (Preoperational-1995). . 3-4 3.1-B Mean Concentration of Air Radioiodine (I-131) (1996-2018) . . . 3-5 3.1-C Mean Concentration of Gross Beta in Air Particulate . . . . . 3-6 3.2-A Mean Concentrations of Radionuclides in Drinking Water (1971-1995) . 3-9 3.2-B Mean Concentrations of Radionuclides in Drinking Water (1996-2018) . 3-10 3.3-A Mean Concentrations of Radionuclides in Surface Water (1969-1995) . . 3-12 3.3-B Mean Concentrations of Radionuclides in Surface Water (1996-2018) . . 3-13 ii

3.4-A Mean Concentration of Radionuclides in Milk (Preoperational-1995). . . 3-15 3.4-B Mean Concentration of Radionuclides in Milk (1996-2018). . . . 3-16 3.5 Mean Concentration of Radionuclides in Vegetation . . . . . 3-18 3.6 Mean Concentrations of Radionuclides in Fish . . . . . . 3-21 3.7 Mean Concentrations of Radionuclides in Shoreline Sediment . . . 3-23 3.8-A Direct Gamma Radiation (TLD) Results . . . . . . . 3-27 3.8-B Direct Gamma Radiation (TLD) Oconee 2018 Investigation Level . . 3-28 3.9 Oconee 2018 Land Use Census Results . . . . . . . 3-30 4.1-A Oconee Nuclear Station 2018 Environmental and Effluent Dose Comparison 4-3 4.1-B Maximum Individual Dose for 2018 based on Environmental Measurements (mrem) for Oconee Nuclear Station . . . . . 4-5 5.0-A Eckert & Ziegler Analytics Cross Check Program . . . . . 5-4 5.0-B 2018 Environmental Dosimeter Cross-Check Results . . . . . 5-6 5.0-C 2018 GEL Laboratories, LLC QA Results . . . . . . . 5-8 LIST OF ACRONYMS USED IN THIS TEXT (in alphabetical order)

A Annually AP Air Particulate AR Air Radioiodine/ Air Cartridge AREOR Annual Radiological Environmental Operating Report BLV Broadleaf Vegetation C Control CR Condition Report (analogous to Nuclear Condition Report (NCR))

EZA Eckert & Ziegler Analytics FI Fish FP Food Product GEL General Engineering Laboratories, LLC GPS Global Positioning System GW Ground Water I Indicator IR Inner Ring - TLDs ISFSI Independent Spent Fuel Storage Installation HBRSEP or RNP H. B. Robinson Steam Electric Plant, Unit No. 2 LLD Lower Limit of Detection M Monthly MAPEP Department of Energy Mixed Analyte Performance Evaluation Program MDA Minimum Detectable Activity mrem millirem mR milliroentgen mR/Std Qtr milliroentgen per standard quarter MWe Megawatt (electrical)

NCR Nuclear Condition Report (analogous to Condition Report (CR))

NIST National Institute of Standards and Technology NRC Nuclear Regulatory Commission ODCM Off-Site Dose Calculation Manual OR Outer Ring - TLDs pCi/kg picocurie per kilogram pCi/l picocurie per liter pCi/m3 picocurie per cubic meter PI Power Interrupt Q Quarterly REMP Radiological Environmental Monitoring Program SA Semiannually SS Sediment - Shoreline SI Special Interest - TLDs SW Surface Water TECH SPECs Technical Specifications TLD Thermoluminescent Dosimeter UFSAR Updated Final Safety Analysis Report Ci/ml microcurie per milliliter W Weekly iii

1.0 EXECUTIVE

SUMMARY

This Annual Radiological Environmental Operating Report describes the Oconee Nuclear Station Radiological Environmental Monitoring Program (REMP), and the program results for the calendar year 2018.

Included are the identification of sampling locations, descriptions of environmental sampling and analysis procedures, comparisons of present environmental radioactivity levels and pre-operational environmental data, comparisons of doses calculated from environmental measurements and effluent data, analysis of trends in environmental radiological data as potentially affected by station operations, and a summary of environmental radiological sampling results. Quality assurance practices and program changes are also discussed.

Sampling activities were conducted as prescribed by Selected Licensee Commitments (SLCs). Required analyses were performed and detection capabilities were met for all collected samples as required by SLCs. One-thousand twenty-six samples were analyzed comprising 1,091 test results in order to compile data for the 2018 report. Based on the annual land use census, the current number of sampling sites for Oconee Nuclear Station is sufficient.

Concentrations observed in the environment in 2018 for station related radionuclides were within the ranges of concentrations observed in the past. Inspection of data showed that radioactivity concentrations in drinking water, surface water, fish, and shoreline sediment are higher than the activities reported for samples collected at control locations. All positively identified measurements attributable to station operation were within limits as specified in SLCs.

Additionally, environmental radiological monitoring data is consistent with effluents introduced into the environment by plant operations. The total body dose estimated to the maximum exposed member of the public as calculated by environmental sampling data, excluding TLD results, was 4.14E-02 mrem for 2018. Background radiation dose in the United States is approximately 620 mrem per year (approximately half from naturally occurring sources such as radon and half from man-made sources such as medical processes).1 It is therefore concluded that station operations has had no significant radiological impact on the health and safety of the public or the environment.

1 NCRP (2009). National Council on Radiation Protection and Measurements. Ionizing Radiation Exposure of the Population of the United States, NCRP Report No. 160 (National Council on Radiation Protection and Measurements, Bethesda, Maryland).

Section 1 - Page 1

2.0 INTRODUCTION

2.1 SITE DESCRIPTION AND SAMPLE LOCATIONS Oconee Nuclear Station (ONS) is located in Oconee County, South Carolina, approximately 8 miles northeast of Seneca, South Carolina, on the shore of Lake Keowee. This lake was formed by damming the Keowee and Little Rivers in that location. Immediately to the south is the U.S.

Government Hartwell Project. The Keowee Hydroelectric Plant near the station joins Lake Keowee and the upper reaches of Lake Hartwell. To the north, the Jocassee Hydroelectric Plant joins Lake Jocassee and Lake Keowee. Jocassee is a pumped storage plant.

ONS consists of three pressurized water reactors. Each unit has an output of 846 megawatts net. Unit 1 license for operation was issued 2/6/1973. Unit 2 license for operation was issued 10/6/1973. Unit 3 license for operation was issued 7/19/1974. An independent spent fuel storage installation is also located at the site.

Figures 2.1-1 and 2.1-2 are maps depicting the Thermoluminescent Dosimeter (TLD) monitoring locations and the sampling locations. The location numbers shown on these maps correspond to those listed in Tables 2.1-A and 2.1-B. Figure 2.1-1 comprises all sample locations within a one mile radius of ONS. Figure 2.1-2 comprises all sample locations within a ten mile radius of ONS.

2.2 SCOPE AND REQUIREMENTS OF THE REMP A Radiological Environmental Monitoring Program (REMP) has been in effect at Oconee Nuclear Station since 1969, four years prior to operation of Unit 1 in 1973. The preoperational program provides data on the existing environmental radioactivity levels for the site and vicinity which may be used to determine whether increases in environmental levels are attributable to the station. The operational program provides surveillance and backup support of detailed effluent monitoring which is necessary to evaluate the significance, if any, of the contributions to the existing environmental radioactivity levels that result from station operation.

This monitoring program is based on NRC guidance as reflected in the Selected Licensee Commitments Manual, with regard to sample media, sampling locations, sampling frequency, and analytical sensitivity requirements. Indicator and control locations were established for comparison purposes to distinguish radioactivity of station origin from natural or other man-made environmental radioactivity. The environmental monitoring program also verifies projected and anticipated radionuclide concentrations in the environment and related exposures from releases of radionuclides from Oconee Nuclear Station. This program satisfies the requirements of Section IV.B.2 of Appendix I to 10CFR50 and 10CFR72.44(d)(2) and provides surveillance of all appropriate critical exposure pathways to man and protects vital interests of the company, public, and state and federal agencies concerned with the environment. Reporting levels for radioactivity found in environmental samples are listed in Table 2.2-A. Table 2.2-B lists the REMP analysis and frequency schedule.

Section 2 - Page 1

The Annual Land Use Census, required by Selected Licensee Commitments, is performed to ensure that changes in the use of areas at or beyond the site boundary are identified and that modifications to the Radiological Environmental Monitoring Program are made if required by changes in land use. This census satisfies the requirements of Section IV.B.3 of Appendix I to 10CFR50. Results are shown in Table 3.9.

Participation in an interlaboratory comparison program as required by Selected Licensee Commitments provides for independent checks on the precision and accuracy of measurements of radioactive material in REMP sample matrices. Such checks are performed as part of the quality assurance program for environmental monitoring in order to demonstrate that the results are valid for the purposes of Section IV.B.2 of Appendix I to 10CFR50. A summary of the results obtained as part of this comparison program are in Section 5 of this annual report.

2.3 STATISTICAL AND CALCULATIONAL METHODOLOGY 2.3.1 ESTIMATION OF THE MEAN VALUE There was one (1) basic statistical calculation performed on the raw data resulting from the environmental sample analysis program. The calculation involved the determination of the mean value for the indicator and the control samples for each sample medium.

The mean is a widely used statistic. This value was used in the reduction of the data generated by the sampling and analysis of the various media in the Radiological Environmental Monitoring Program. 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. The following equation was used to estimate the mean:

N x

i 1 i

x =

N Where:

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

i = net activity (or concentration) for sample i.

Section 2 - Page 2

2.3.2 LOWER LIMIT OF DETECTION AND MINIMUM DETECTABLE ACTIVITY The Lower Limit of Detection (LLD) and Minimum Detectable Activity (MDA) are used throughout the Environmental Monitoring Program.

LLD - The LLD, as defined in the Selected Licensee Commitments Manual is 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% probability with only 5%

probability of falsely concluding that a blank observation represents a "real" signal. The LLD is an a priori (before the fact) lower limit of detection. 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 given in the Selected Licensee Commitments and are listed in Table 2.2-C.

MDA - The MDA 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 MDA 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.

2.3.3 TREND IDENTIFICATION One of the purposes of an environmental monitoring program is to determine if there is a buildup of radionuclides in the environment due to the operation of the nuclear station.

Visual inspection of tabular or graphical presentations of data (including preoperational) is used to determine if a trend exists. A decrease in a particular radionuclide's concentration in an environmental medium does not indicate that reactor operations are removing radioactivity from the environment but that reactor operations are not adding that radionuclide to the environment in quantities exceeding the preoperational level and that the normal removal processes (radioactive decay, deposition, resuspension, etc.) are influencing the concentration.

Substantial increases or decreases in the amount of a particular radionuclide's release from the nuclear plant will greatly affect the resulting environmental levels; therefore, a knowledge of the release of a radionuclide from the nuclear plant is necessary to completely interpret the trends, or lack of trends, determined from the environmental data. Some factors that may affect environmental levels of radionuclides include prevailing weather conditions (periods of drought, solar cycles or heavier than normal precipitation), construction in or around either the nuclear plant or the sampling location, and addition or deletion of other sources of radioactive materials (such as the 1986 Chernobyl accident and the 2011 Japan earthquake and tsunami, which triggered the Fukushima Dai-ichi nuclear power plant incident). Some of these factors may be obvious while others are sometimes unknown. Therefore, how trends are identified will include some judgment by plant personnel.

Section 2 - Page 3

Figure 2.1-1 Oconee Nuclear Station Sampling Locations Map (One Mile Radius)

J

) \

TLD Locations All Other Locations 087 /'</ Railroads

\

Roads

[= ] States

[= ] Counties

- Waterbody Approximate /ocabon of features shOVJTl 0 0.25 0.5

===:::::iMiles Projection NCSP NAD27 089

Map generated September 10, 2018 Section 2 - Page 4

Figure 2.1-2

) Oconee Nuclear

-~

Station Sampling

" J Locations Map

(

') i 303.75"-

7'5 ~

326.25~0 9

.,/

Peckens 052 (Ten Mile Radius)

T LO Locations All Other Locations 56.25° - .*

/\</

\~ \~

Railroads Roads C_J States 78.75 ° CJ Counties

[:1 Waterbody s: m "Lil,e y

101 .25° 053 I Incorporated Areas l\pprox1mate IOcation of features shown W estminster

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...--,-----.....--t....--:,-........,~

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- 2 3 1Miles Projection NCSP NAD27 Other Sampling Locations Map generated September 10, 2018 066 ( 18 9 Mi. SSE)

Section 2 - Page 5

TABLE 2.1-A OCONEE RADIOLOGICAL MONITORING PROGRAM SAMPLING LOCATIONS Table 2.1-A Codes W Weekly SM Semimonthly BW BiWeekly Q Quarterly M Monthly SA Semiannually C Control I Indicator Site Measure Air Rad. & Surface Drinking Shoreline Fish Milk Broadleaf Location Description* Particulate Water Water Sediment Vegetation

Type 060 I Greenville Water Intake Road (3.23 NE) M 060 C** Greenville Water Intake Road (2.28 NE) SA 062 C Lake Keowee Hydro Intake (0.85 mi ENE) M Lake Hartwell Hwy 183 Bridge 063 I (0.80 mi ESE) [000.7] SA 063.1 I Lake Hartwell Hwy 183 (0.79 mi E) M 064 C Seneca Municipal Water Supply (6.67 mi SSW) M

[004.1]

066 I Anderson Municipal Water Supply (18.9 mi M SSE) [012]

Lawrence Ramsey Bridge Hwy 27 067 I (4.34 mi SSE) [005.2] SA SA 068 C High Falls County Park (1.82 mi W) SA 071 C Clemson Dairy (10.2 mi SSE) [006.3] SM 077 I Skimmer Wall (1.00 mi SW) W M 078.1 I Recreation Site (0.53 mi WSW) W 079 I Keowee Dam (0.56 mi NE) W M 081 C Clemson Operations Center (9.33 mi SE) W M 084 I Sue Craig Road (2.58 mi NNE) W M 085 I Lake Services / Building B9125 (0.88 mi NNW) W 091 I Holders Landing Road (2.09 miles S) SA

GPS data reflect approximate accuracy to within 2-5 meters. GPS field measurements were taken as close as possible to the item of interest.

- Control for Fish Only

[ ] Location Numbers prior to 1984 Section 2 - Page 6

TABLE 2.1-B OCONEE RADIOLOCICAL MONITORING PROGRAM SAMPLING LOCATIONS (TLD SITES)

Table 2.1-B Codes IR Inner Ring OR Outer Ring C Control SI Special Interest Site Measure Location* Distance Sector Site Measure Location* Distance Sector

Type (miles) # Type (miles) 020 IR Site Boundary 0.16 N 044 OR HWY 130 at Little River Dam 3.96 S Terminus of HWY 588 021 IR Site Boundary 0.25 NNE 045 OR at Crooked Creek 4.78 SSW HWY 188 at 022 IR Site Boundary 0.53 NE 046 OR Crooked Creek 4.61 SW 023 IR Site Boundary 0.93 ENE 047 OR New Hope Church, HWY 188 3.58 WSW 024 IR Site Boundary 0.81 E 048 OR JCT HWY 175 & 188 3.64 W 025 IR Site Boundary 0.42 ESE 049 OR JCT HWY 201 & 92 3.60 WNW Stamp Creek Landing, 026 IR Site Boundary 0.34 SE 050 OR End of HWY 92 3.53 NW HWY 128, 027 IR Site Boundary 0.49 SSE 051 OR 1 mile N OF HWY 130 4.64 NNW DPC Branch Office Site, 028 IR Site Boundary 0.46 S 052 SI Pickens 12.4 ENE 029 IR Site Boundary 0.56 SSW 053 SI DPC Branch Office Site, Liberty 11.7 E 030 IR Site Boundary 0.42 SW 054 SI Post Office - HWY 93 Norris 8.60 ESE 031 IR Site Boundary 0.27 WSW 055 SI Clemson Meteorology Plot 9.27 SSE 076 IR Site Boundary 0.19 W 056 SI Water Tower - Seneca 7.30 SSW 032 IR Site Boundary 0.19 WNW 057 SI Oconee Memorial Hospital 8.42 SW 033 IR Site Boundary 0.21 WNW 058 C Branch Rd Substation, Walhalla 9.39 WSW 034 IR Site Boundary 0.22 NW 059 SI Tamassee Dar School 9.20 NW Skimmer wall shared with air 035 IR Site Boundary 0.17 NNW 077*** IR monitoring station 1.00 SW ONS Recreation Site shared 036 OR Mile Creek Landing 4.18 N 078.1*** IR with air monitoring station 0.53 WSW 037 OR Keowee Church, HWY 327 4.85 NNE 081 C Clemson Operations Center 9.33 SE Convenience Mart, Lake Services Bldg 9125 shared 038 OR JCT HWY 183 & 133 4.24 NE 085*** IR with air monitoring location 0.88 NNW HWY 133, 1 mile East Lake Keowee Service Rd at 039 OR of JCT HWY 183 & 133 4.02 ENE 086*** IR Boat Landing 0.83 NW Microwave Tower, Six 040 OR Mile 4.74 E 087*** IR End of Waterfall Rd 1.33 WNW Doug Hollow Rd / Transmission 041 OR JCT HWY 101 & 133 4.25 ESE 088*** IR Tower 1.00 SSW Lawrence Chapel Church, Intersection 042 OR HWY 133 4.93 SE 089*** IR Hwy 130 & Keowee River Rd 1.19 S HWY 291 at Crescent Resources, Keowee 043 OR Issaqueena Park 4.09 SSE 090*** IR River Rd at Beaver Dam 0.79 SE Hilton Circle stop sign 092** OR HWY 188 3.62 WSW

GPS data reflect accuracy to within 2-5 meters. GPS field measurements were taken as close as possible to the item of interest.

- TLD location added to Oconee REMP, ODCM Revision 59 (NCR # 02226974).

- - TLD location changed from Special Interest to Inner Ring (NCR # 02266080).

Section 2 - Page 7

TABLE 2.2-A REPORTING LEVELS FOR RADIOACTIVITY CONCENTRATIONS IN ENVIRONMENTAL SAMPLES Analysis Water Air Particulates Fish Milk Broadleaf (pCi/liter) or Gases (pCi/kg-wet) (pCi/liter) Vegetation (pCi/m3) (pCi/kg-wet)

H-3 20,000(a) --- --- --- ---

Mn-54 1,000 --- 30,000 --- ---

Fe-59 400 --- 10,000 --- ---

Co-58 1,000 --- 30,000 --- ---

Co-60 300 --- 10,000 --- ---

Zn-65 300 --- 20,000 --- ---

Zr-Nb-95 400 --- --- --- ---

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

(a) For drinking water samples only. This is 40CFR Part 141 value.

(b) If low-level I-131 analyses are performed.

TABLE 2.2-B REMP ANALYSIS FREQUENCY Sample Analysis Gamma Tritium Low Level Gross TLD Medium Schedule Isotopic I-131 Beta Air Radioiodine Weekly X --- --- ---

Air Weekly --- --- --- X ---

Particulate Quarterly Composite X --- --- --- ---

Direct Radiation Quarterly --- --- --- --- X Surface Monthly X --- --- --- ---

Water Quarterly Composite --- X --- --- ---

Drinking Monthly X --- (a) X ---

Water Quarterly Composite --- X --- --- ---

Shoreline Sediment Semiannually X --- --- --- ---

Milk Semimonthly X --- X --- ---

Fish Semiannually X --- --- --- ---

Broadleaf Vegetation Monthly X --- --- --- ---

(a) Low level I-131 analysis will be performed if abnormal releases occur which could reasonably result in > 1 pCi/liter of I-131 in drinking water. An LLD of 1 pCi/liter will be required for this analysis.

Section 2 - Page 8

TABLE 2.2-C MAXIMUM VALUES FOR THE A PRIORI LOWER LIMITS OF DETECTION Analysis Water Air Fish Milk Broadleaf Sediment (pCi/liter) Particulates (pCi/kg-wet) (pCi/liter) Vegetation (pCi/kg-dry) or Gases (pCi/kg-wet)

(pCi/m3)

Gross Beta 4 0.01 --- --- --- ---

H-3 2000 --- --- --- --- ---

Mn-54 15 --- 130 --- --- ---

Fe-59 30 --- 260 --- --- ---

Co-58, 60 15 --- 130 --- --- ---

Zn-65 30 --- 260 --- --- ---

Zr-95 15 --- --- --- --- ---

Nb-95 15 --- --- --- --- ---

I-131 15(a) 0.07 --- 1 60 Cs-134 15 0.05 130 15 60 150 Cs-137 18 0.06 150 18 80 180 Ba-La-140 15 --- --- 15 --- ---

(a) LLD for low-level I-131 analyses is 1 pCi/liter if performed Section 2 - Page 9

3.0 INTERPRETATION OF RESULTS Review of 2018 REMP analysis results was performed to identify changes in environmental levels as a result of station operations. The review is summarized in this section. Data from 2018 was compared to preoperational and historical data. Sample data for some media is not directly comparable to preoperational and earlier operational sample results because of either significant changes in the analysis methods or changes in the reporting of the results. Summary tables containing 2018 information required by Technical Specification Administrative Control 5.6.2 are located in Appendix B. REMP results for 2018 are located in Appendix E.

Evaluation for significant trends was performed for the radionuclides that have required LLDs listed in Selected Licensee Commitment 16.11.6. These radionuclides are collectively referred to as "Selected Licensee Commitments radionuclides" and include H-3, Mn-54, Fe-59, Co-58, Co-60, Zn-65, Zr-95, Nb-95, I-131, Cs-134, Cs-137, Ba-140, and La-140. Drinking water gross beta results are routinely trended. Trending of air particulate gross beta results was initiated in 1996 when the analysis was resumed. Trending is also performed for other radionuclides that are detected and could have been the result of station effluents. Only Selected Licensee Commitment radionuclides were detected in 2018.

Trending was performed by comparing annual mean concentrations of any effluent related detected radionuclide to historical results. Factors evaluated include the frequency of detection and the concentration in terms of the percent of the radionuclide's SLC reporting level (Table 2.2-A). All maximum percent of reporting level values were well below the 100% action level.

The highest value reached during 2018 due to ONS operation was 2.3 % for H-3 in a drinking water sample collected at location 066.

Changes in sample location, analytical technique, and presentation of results must be considered when reviewing for trends. Calculation of the annual mean concentrations has been performed differently over the history of the REMP. During 1979-1986, all net results (sample minus background), positive and negative, were included in the calculation of the mean. Only positive net activity results were used to calculate the mean for the other years. A change in gamma spectroscopy analysis systems in 1987 ended a period when many measurements yielded detectable low-level activity for both indicator and control location samples. It is thought that the method the previous system used to estimate net activity may have been vulnerable to false-positive results.

Review of the 2018 data presented in this section supports the conclusion that there were no significant changes in environmental sample radionuclide concentrations of samples collected and analyzed from ONS and surrounding areas that were attributable to plant operations. The radiological environmental data for 2018 indicates that radioactivity concentrations were not higher than expected and all positively identified measurements attributable to ONS operations in 2018 were within limits as specified in the ONS SLC, thus presenting no significant impact on the environment or public safety.

Data presented in Sections 3.1 - 3.8 support the conclusion that there was no significant increase in radioactivity in the environment around ONS due to station operations in 2018. Similarly, Section 3 - Page 1

there was no significant increase in ambient background radiation levels in the surrounding areas. The 2018 land use census data, shown in Section 3.9, indicates that no program changes are required as a result of the census.

Section 3 - Page 2

3.1 AIRBORNE RADIOIODINE AND PARTICULATES In 2018, 312 radioiodine and particulate samples were analyzed, 260 from five indicator locations and 52 from the control location. Particulate samples were analyzed weekly for gross beta. A quarterly gamma analysis was performed on the quarterly filter composite (by location).

Radioiodine samples received a weekly gamma analysis. Due to a field placement error, there was one air particulate filter analyzed separately from the 2018 first quarter composite to prevent from having more than 13 filters in the composite (NCR # 02179565 and NCR # 02180971).

There was no detectable I-131 in air samples in 2018. Table 3.1-A and Table 3.1-B give the highest indicator location annual mean and control location annual mean for I-131 since the preoperational period. The tables show similar historical concentrations for both the indicator and control locations and the activities decreasing from early in the operational history of the plant. No I-131 activity due to ONS plant operations has been detected since 1994.

There were no detectable gamma emitting radionuclides detected in air particulate samples in 2018 due to ONS plant operations. No gamma emitting particulates due to ONS operations have been detected in indicator location samples since the change in gamma spectroscopy analysis systems in 1987.

Beta analysis of particulate filters was initiated in March of 1996 and became required by Selected Licensee Commitments in 1998. Gross beta analysis was performed on particulate filters during the preoperational and early operational history of the plant but had not been required since 1984. Figure 3.1 summarizes gross beta results for the indicator location with the highest annual mean and the control location samples. Table 3.1-C gives the Gross Beta concentration in air particulate filters since 1996. Both the indicator and control location results are similar in concentration and are near the lower range of preoperational gross beta results which ranged from 0.04 to 1.46 pCi/m3.

K-40 and Be-7 observed in air samples are naturally occurring radionuclides.

Section 3 - Page 3

Table 3.1-A Mean Concentration of Air Radioiodine (I-131) (Preoperational-1995)

Year Indicator Location (pCi/m3) Control Location (pCi/m3)

Preoperational 1969-1972 0.00E0 0.00E0 Feb. 1973 - June 1973 0.00E0 0.00E0 July 1973 - Dec. 1973 0.00E0 0.00E0 Jan. 1974 - June 1974 0.00E0 0.00E0 July 1974 - Dec. 1974 2.60E-2 8.00E-3 Jan. 1975 - June 1975 8.65E-2 3.12E-2 July 1975 - Dec. 1975 1.13E-2 9.52E-3 1976 2.76E-2 2.18E-2 1977 3.60E-2 3.60E-2 1978 2.19E-1 1.15E-1 1979 7.54E-3 4.75E-4 1980 3.07E-3 9.67E-4 1981 6.31E-3 5.39E-4 1982 2.87E-3 8.10E-4 1983 1.48E-3 3.05E-4 1984 8.11E-4 -2.30E-5 1985 7.71E-4 4.54E-4 1986 5.02E-3 7.86E-3 1987(1) 4.29E-3 5.19E-3 1988 0.00E0 0.00E0 1989 4.99E-4 0.00E0 1990 0.00E0 0.00E0 1991 0.00E0 0.00E0 1992 0.00E0 0.00E0 1993 0.00E0 0.00E0 1994 1.03E-2 0.00E0 1995 0.00E0 0.00E0 0.00E0 indicates no detectable measurements 1979 - 1986 mean based on all net activity (1) 1987 - Gamma spectroscopy system change Section 3 - Page 4

Table 3.1-B Mean Concentration of Air Radioiodine (I-131) (1996-2018)

Year Indicator Location (pCi/m3) Control Location (pCi/m3) 1996 0.00E0 0.00E0 1997 0.00E0 0.00E0 1998 0.00E0 0.00E0 1999 0.00E0 0.00E0 2000 0.00E0 0.00E0 2001 0.00E0 0.00E0 2002 0.00E0 0.00E0 2003 0.00E0 0.00E0 2004 0.00E0 0.00E0 2005 0.00E0 0.00E0 2006 0.00E0 0.00E0 2007 0.00E0 0.00E0 2008 0.00E0 0.00E0 2009 0.00E0 0.00E0 2010 0.00E0 0.00E0 2011(1) 5.05E-2 4.13E-2 2012 0.00E0 0.00E0 2013 0.00E0 0.00E0 2014(2) 0.00E0 0.00E0 2015 0.00E0 0.00E0 2016 0.00E0 0.00E0 2017 0.00E0 0.00E0 2018 0.00E0 0.00E0 0.00E0 indicates no detectable measurements (1) 2011 concentration affected by Fukushima Daiichi (2) 2014 Gamma spectroscopy system was replaced 10JUL2014. Gamma spectroscopy system hardware, detector cooling apparatus, software, electronics, nuclide identification libraries, and analytical test matrix components for test matrices were modified (NCR # 0739995). No analytical changes were noted due to the 2014 gamma spectroscopy system change.

Section 3 - Page 5

Figure 3.1 pCi/m 3 Concentration of Gross Beta in Air Particulate 4.SOOE-2 4.000E-2

~~~

-+-----+i--+/- -~ - --=f~ I 3.000E-2 l 2.SOOE-2 -',

2.000E-2 1.SOOE-2

\ f----:r:-- ~----Ft=a~' !

I r --i 1.000E-2 5.000E-3 O.OOOE+O 1996 1998 2000 2002 2004 2006 2008 2010 t 2012 2014 2016 2018

-e- Indicat or Location - - Contro l Location There is no reporting level for gross beta in air particulate Table 3.1-C Mean Concentration of Gross Beta in Air Particulate Monitorinf Period Indicator Location (pCi/m 3 ) Control Location (pCi/m 3 )

1996 3.87E-2 3.69E-2 1997 2.87E-2 2.92E-2 1998 2.47E-2 1.56E-2 1999 2.85E-2 2.23E-2 2000 2.38E-2 1.85E-2 2001 2.0SE-2 l .94E-2 2002 2.01E-2 1.84E-2 2003 1.86E-2 1.82E-2 2004 1.92E-2 1.90E-2 2005 l.95E-2 1.91 E-2 2006 2.09E-2 2.00E-2 2007 2.31E-2 2. 13E-2 2008 2.08E-2 2.04E-2 2009 1.82E-2 1.80E-2 2010 2.02E-2 2.04E-2 2011 2.06E-2 l.92E-2 2012 2.63E-2 l .97E-2 201 3 l .96E-2 l.74E-2 2014 2.1 lE-2 1.86E-2 2015 2.13E-2 l .78E-2 2016 2.37E-2 2.17E-2 2017 2.58E-2 2.28E-2 2018 2.30E-2 2.0IE-2 Section 3 - Page 6

3.2 DRINKING WATER Gross beta analysis and gamma spectroscopy were performed on 39 monthly drinking water samples. These samples were composited to form 12 quarterly composite period samples for Tritium analysis. Two indicator locations and a control location were sampled; however, only one of the indicator locations is downstream of the effluent release point.

Table 3.2-A lists the highest indicator location annual mean and control location annual mean for gross beta results since the preoperational period through 1995. Table 3.2-B lists the highest indicator location annual mean and control location annual mean for gross beta results from 1996 through 2018. The indicator location had an average concentration of 1.50 pCi/liter in 2018, and the control location had a concentration of 1.27 pCi/liter. For comparison purposes, the 2017 indicator mean was 1.25 pCi/liter. Figure 3.2-1 shows the highest indicator and control location annual means for gross beta. The tables show that 2018 gross beta levels in drinking water are lower than preoperational concentrations.

Tritium was detected in four of the twelve composite samples during 2018. The 2018 mean indicator location 066 concentration was 356 pCi/liter, which is 1.78% of the 20,000 pCi/l Tritium reporting level. Table 3.2-A, Table 3.2-B and Figure 3.2-2 show the highest indicator and control location annual means for Tritium since analysis was initiated early in the operational period. Tritium concentrations have decreased at both the indicator and control locations. The closure of the Clemson water plant in 1989 is one reason for the decrease shown in the table and graph. The Clemson site was typically the high mean location when the plant was in operation.

There were no gamma emitting radionuclides attributable to plant operations identified in drinking water samples in 2018. Gamma spectroscopy analysis has not detected any gamma activity in the water supplies since 1988.

The dose for consumption of water was less than one mrem per year based on effluent calculations and there were no abnormal releases exceeding 1 pCi/liter I-131 in 2018; therefore low-level iodine analysis is not required.

K-40 and Be-7 observed in drinking water samples are naturally occurring radionuclides.

Section 3 - Page 7

Figure 3.2-1 pCl/liter Concentration of Gross Beta in Drinking Water 10 -----r----.---.-----.-----.------,---.------.--- .---.------r----r---,----.--,

,i1

'l'l I \ I

~"

~

{

,I

\

V 0

1976 1982 1988 1994 2000 2006 2012 2018

---e--- Contro l Locat ion

-- lnd1cat or l ocaticn Figure 3.2-2 pCi/liter Concentration ofTritium in Drinking Water 5000 I

4500 4000 3500 I 3000 2500 I I\

Ii

/ " l 2000 I I I

~

1500 1000 t i

j Ir \ *-- .__

~

_/ \1 1111

'"'*1\

I Ii II 1:~,,-,

/, ) \ . \ -~ * * * * * ........ fiJ *

t.-** *

==I~ *=,_* '= ~ -

500 I

, . . * * .. . . I I(* *

-- - ~_J} I- - - - - - - - - - - - - - =L ---

1974 1978 1983 1988 1993 1998 2003 zooo 2013 20 18

In dica t or location -* Control Locatio n - 20 % Re por ting Level Current reporting level implemented 1984 Section 3 - Page 8

Table 3.2-A Mean Concentrations of Radionuclides in Drinking Water (1971-1995)

Gross Beta (pCi/l) Tritium (pCi/l)

Year Indicator Control Indicator Control Location Location Location Location Preoperational ending Jan. 1971 3.03 5.90 Analysis not required Preoperational ending Jan. 1973 3.58 4.94 Analysis not required Feb. 1973 - June 1973 Qualitative results reported Analysis not required June 1973 - Dec. 1973 7.15 21.78 Analysis not required Jan. 1974 - June 1974 3.13 6.98 Analysis not required July 1974 - Dec. 1974 2.24 2.02 525 330 Jan. 1975 - June 1975 1.98 1.59 600 300 July 1975 - Dec. 1975 2.01 1.22 2990 505 1976 2.38 2.00 2196 224 1977 2.70 2.30 1200 290 1978 2.56 2.17 1050 333 1979 1.83 1.36 576 235 1980 1.86 1.63 660 200 1981 1.98 1.88 830 127 1982 2.04 1.45 643 153 1983 1.85 1.54 937 220 1984 1.87 1.08 765 145 1985 2.14 1.16 856 210 1986 1.91 1.04 1240 503 1987 2.00 1.20 815 680 1988 2.00 1.40 1570 0.00 1989 2.30 1.80 1350 559 1990 3.00 2.70 0.00 0.00 1991 1.80 1.40 558 0.00 1992 3.20 1.60 0.00 0.00 1993 2.10 1.90 0.00 0.00 1994 1.90 2.10 0.00 0.00 1995 5.10 2.90 248 0.00 0.00 indicates no detectable measurements 1989 - Clemson water plant closes; nearest downstream plant is Anderson.

1979 - 1986 mean based on all net activity results Section 3 - Page 9

Table 3.2-B Mean Concentrations of Radionuclides in Drinking Water (1996-2018)

Gross Beta (pCi/l) Tritium (pCi/l)

Year Indicator Control Indicator Control Location Location Location Location 1996 2.07 1.77 214 0.00 1997 2.52 2.23 194 0.00 1998 2.48 1.70 0.00 0.00 1999 1.73 1.49 185 0.00 2000 2.07 1.68 251 0.00 2001 1.75 1.29 390 0.00 2002 1.61 1.21 338 0.00 2003 1.51 1.05 266 0.00 2004 1.58 1.25 225 0.00 2005 1.28 1.37 377 0.00 2006 1.54 1.75 340 0.00 2007 1.58 1.08 402 0.00 2008 1.82 1.25 372 0.00 2009 1.37 1.19 415 0.00 2010 1.10 0.97 308 0.00 2011 1.18 1.00 339 0.00 2012 1.40 0.92 322 0.00 2013 1.57 1.11 325 0.00 2014 1.43 1.12 292 0.00 2015 2.34 1.46 325 0.00 2016 1.44 1.15 325 0.00 2017 1.25 1.19 419 0.00 2018 1.50 1.27 356 0.00 0.00 indicates no detectable measurements Section 3 - Page 10

3.3 SURFACE WATER Gamma spectroscopy was performed on 26 monthly surface water samples. These samples were composited to form eight quarterly composite period samples for Tritium analysis. One indicator and one control location were sampled. The indicator location is near the liquid effluent release point.

Tritium was detected in the four indicator location samples. The 2018 average concentration was 3,515 pCi/liter. The individual samples ranged from 1,290 to 5,610 pCi/liter. For comparison purposes, the 2017 mean concentration was 5,564 pCi/liter. Tritium was not detected in any control surface water samples.

Figure 3.3 shows the indicator and control annual means for Tritium since the preoperational period. Table 3.3-A lists the indicator annual means since preoperational through 1995. Table 3.3-B lists the indicator annual means from 1996 through 2018.

Gamma spectroscopy analysis did not detect any station related gamma activity during 2018. No gamma emitting radionuclides attributable to station operation have been detected in surface water samples since 1999. Table 3.3-A and Table 3.3-B summarize the indicator annual means of radionuclides detected since the change in the gamma spectroscopy analysis system in 1987.

Visual inspection of the gamma spectroscopy tabular data covering the early operational period through 2018 did not reveal any increasing trends .

K-40 and Be-7 observed in surface water samples are naturally occurring radionuclides.

Figure 3.3 pCl/liter Concentration of Tritium in Surface Water 60000 I

50000 IA 40000 I I\'\

j 1 \

30000 11 i 20000 II \

i 1,

.... * . *.. *' . ~ -"'-. 'J"1. . I ' \

10000 0

1969

,....~

i 97S 1978 1983 L... .. -

1988

....-4*......,_*..1... *...

1993 1998

t::~~~ .

2003 2008 201J 2018

lnd1cJtor Location - . - control Location There is no reporting level for Tritium in surface water Section 3 - Page 11

Table 3.3-A Mean Concentrations of Radionuclides in Surface Water (1969-1995)

Year Co-58 (pCi/l) Co-60 (pCi/l) Nb-95 (pCi/l) Cs-137 (pCi/l) H-3 pCi/l)

Preoperational 1969 Qualitative results reported 4.86E2 Preoperational 1970 Qualitative results reported 5.94E2 Preoperational 1971 Qualitative results reported 4.01E2 Preoperational 1972 Qualitative results reported 3.62E2 1973 Qualitative results reported 0.00E0 1974 0.00E0 1.32E1 0.00E0 1.60E1 1.99E3 Jan. 1975 - June 1975 0.00E0 0.00E0 0.00E0 0.00E0 1.56E4 July 1975 - Dec. 1975 0.00E0 1.34E1 0.00E0 0.00E0 5.52E4 1976 1.08E2 3.30E1 0.00E0 3.50E1 2.95E4 1977 2.60E1 1.80E1 0.00E0 3.10E1 2.90E3 1978 2.96E2 0.00E0 0.00E0 2.22E1 8.00E2 1979 1.33E0 2.60E0 1.78E0 2.82E0 4.37E3 1980 1.56E0 2.30E0 1.22E0 5.40E0 4.93E3 1981 1.10E0 6.10E-1 1.70E0 3.90E0 7.21E3 1982 6.14E-1 1.99E0 2.29E0 4.85E0 6.13E3 1983 6.99E-1 3.02E0 3.91E-1 6.83E-1 8.40E3 1984 9.40E-1 6.30E-1 7.90E-1 4.83E-1 9.90E3 1985 2.15E-1 6.27E-1 4.95E-1 9.90E-1 1.05E4 1986 3.28E0 1.23E0 1.14E0 3.07E-1 1.26E4 1987(1) 5.10E1 3.40E0 4.00E0 0.00E0 7.08E3 1988 6.20E0 5.00E0 2.50E0 3.50E0 1.10E4 1989 5.30E0 3.00E0 0.00E0 3.40E0 1.02E4 1990 1.70E0 1.60E0 0.00E0 0.00E0 1.03E4 1991 5.40E0 0.00E0 0.00E0 0.00E0 5.76E3 1992 2.50E0 0.00E0 0.00E0 0.00E0 6.22E3 1993 0.00E0 0.00E0 0.00E0 0.00E0 8.62E3 1994 0.00E0 0.00E0 0.00E0 0.00E0 5.75E3 1995 0.00E0 0.00E0 0.00E0 0.00E0 6.65E3 0.00E0 indicates no detectable measurements 1979-1986 mean based on all net activity results (1) 1987 - Gamma spectroscopy system change Section 3 - Page 12

Table 3.3-B Mean Concentrations of Radionuclides in Surface Water (1996-2018)

Year Co-58 (pCi/l) Co-60 (pCi/l) Nb-95 (pCi/l) Cs-137 (pCi/l) H-3 pCi/l) 1996 0.00E0 0.00E0 0.00E0 0.00E0 4.54E3 1997 0.00E0 0.00E0 0.00E0 0.00E0 5.50E3 1998 0.00E0 0.00E0 0.00E0 0.00E0 3.35E3 1999 2.73E1 0.00E0 0.00E0 0.00E0 1.13E4 2000 0.00E0 0.00E0 0.00E0 0.00E0 1.48E4 2001 0.00E0 0.00E0 0.00E0 0.00E0 7.43E3 2002 0.00E0 0.00E0 0.00E0 0.00E0 1.00E4 2003 0.00E0 0.00E0 0.00E0 0.00E0 4.77E3 2004 0.00E0 0.00E0 0.00E0 0.00E0 3.86E3 2005 0.00E0 0.00E0 0.00E0 0.00E0 5.15E3 2006 0.00E0 0.00E0 0.00E0 0.00E0 6.72E3 2007 0.00E0 0.00E0 0.00E0 0.00E0 9.91E3 2008 0.00E0 0.00E0 0.00E0 0.00E0 9.43E3 2009 0.00E0 0.00E0 0.00E0 0.00E0 4.68E3 2010 0.00E0 0.00E0 0.00E0 0.00E0 1.23E4 2011 0.00E0 0.00E0 0.00E0 0.00E0 4.75E3 2012 0.00E0 0.00E0 0.00E0 0.00E0 5.76E3 2013 0.00E0 0.00E0 0.00E0 0.00E0 3.68E3 2014(1) 0.00E0 0.00E0 0.00E0 0.00E0 3.49E3 2015 0.00E0 0.00E0 0.00E0 0.00E0 7.73E3 2016 0.00E0 0.00E0 0.00E0 0.00E0 4.29E3 2017 0.00E0 0.00E0 0.00E0 0.00E0 5.56E3 2018 0.00E0 0.00E0 0.00E0 0.00E0 3.52E3 0.00E0 indicates no detectable measurements (1) 2014 Gamma spectroscopy system was replaced 10JUL2014. Gamma spectroscopy system hardware, detector cooling apparatus, software, electronics, nuclide identification libraries, and analytical test matrix components for test matrices were modified (NCR # 0739995). No analytical changes were noted due to the 2014 gamma spectroscopy system change.

Section 3 - Page 13

3.4 MILK Gamma spectroscopy and low level iodine analysis was performed on 26 milk samples collected from the control location in 2018. No indicator dairies were sampled during 2018 and none were identified by the 2018 land use census.

The milk animal found at 4.66 miles in the East sector during the 2017 LUC was no longer present during the 2018 LUC, and no longer appears on Figure 3.9.

There were no gamma emitting radionuclides due to ONS plant operations identified in milk samples in 2018. Cs-137 is the only radionuclide, other than naturally occurring, reported in milk samples since 1988 (excluding Fukushima Daiichi). Cs-137 in milk is not unusual. It is a constituent of nuclear weapons test fallout and nuclear plant accidents and has been observed periodically in samples from indicator and control locations since the preoperational period.

Table 3.4-A lists the highest indicator location annual mean and control location annual mean for Cs-137 since the preoperational period through 1995. Table 3.4-B lists the highest indicator location annual mean and control location annual mean for Cs-137 from 1996 through 2018.

The tables show similar concentrations for both indicator and control locations through 2005, and Cs-137 was not detected in the control location since 1996.

K-40 observed in milk samples is a naturally occurring radionuclide.

Section 3 - Page 14

Table 3.4-A Mean Concentration of Radionuclides in Milk (Preoperational-1995)

Year Cs-137 Indicator (pCi/l) Cs-137 Control (pCi/l)

Preoperational 1.57E1 1.46E1 Feb. 1973 - June 1973 Qualitative results reported Qualitative results reported July 1973 - Dec. 1973 5.80E0 Qualitative results reported Jan. 1974 - June 1974 5.30E0 0.00E0 July 1974 - Dec. 1974 1.11E1 0.00E0 Jan. 1975 - June 1975 1.51E1 9.45E0 July 1975 - Dec. 1975 0.00E0 0.00E0 1976 1.80E1 7.47E0 1977 0.00E0 0.00E0 1978 1.33E1 1.33E1 1979 7.25E0 2.52E0 1980 3.58E0 2.63E0 1981 5.52E0 5.51E0 1982 2.71E0 3.25E0 1983 5.04E0 -4.27E-1 1984 2.30E0 2.58E0 1985 2.38E0 1.31E0 1986 2.92E0 2.97E0 1987(1) 4.90E0 4.90E0 1988 3.90E0 3.20E0 1989 4.70E0 2.90E0 1990 6.40E0 0.00E0 1991 5.00E0 0.00E0 1992 6.60E0 0.00E0 1993 0.00E0 0.00E0 1994 0.00E0 1.80E0 1995 2.30E0 2.00E0 0.00E0 indicates no detectable measurements 1979 - 1986 mean based on all net activity results (1) 1987 - Gamma spectroscopy system change Section 3 - Page 15

Table 3.4-B Mean Concentration of Radionuclides in Milk (1996-2018)

Year Cs-137 Indicator (pCi/l) Cs-137 Control (pCi/l) 1996 0.00E0 4.10E0 1997 0.00E0 0.00E0 1998 0.00E0 0.00E0 1999 0.00E0 0.00E0 2000 0.00E0 0.00E0 2001 0.00E0 0.00E0 2002 0.00E0 0.00E0 2003 0.00E0 0.00E0 2004 0.00E0 0.00E0 2005(1) 0.00E0 0.00E0 2006 No Indicator Location 0.00E0 2007 No Indicator Location 0.00E0 2008 No Indicator Location 0.00E0 2009 No Indicator Location 0.00E0 2010 No Indicator Location 0.00E0 2011 No Indicator Location 0.00E0 2012 No Indicator Location 0.00E0 2013 No Indicator Location 0.00E0 2014(2) No Indicator Location 0.00E0 2015 No Indicator Location 0.00E0 2016 No Indicator Location 0.00E0 2017 No Indicator Location 0.00E0 2018 No Indicator Location 0.00E0 0.00E0 indicates no detectable measurements (1) The Oconee milk program was updated to align with NUREG-1301 during 2005 (NCR # 01753418). Location 071 was designated as the new control site effective with the 7/12/2005 sampling.

(2) 2014 Gamma spectroscopy system was replaced 10JUL2014. Gamma spectroscopy system hardware, detector cooling apparatus, software, electronics, nuclide identification libraries, and analytical test matrix components for test matrices were modified (NCR # 0739995). No analytical changes were noted due to the 2014 gamma spectroscopy system change.

Section 3 - Page 16

3.5 BROADLEAF VEGETATION Gamma spectroscopy was performed on 48 broadleaf vegetation samples during 2018. Three indicator locations and one control location were sampled. There were no gamma emitting radionuclides due to ONS plant operations identified in vegetation samples in 2018.

Cs-137 is the only radionuclide, other than naturally occurring, reported in vegetation samples since the change in gamma spectroscopy analysis systems in 1987. Figure 3.5 shows the indicator and control annual means for Cs-137 since the early operational period of the plant. Table 3 .5 shows historical concentrations of Cs-13 7.

It is not unusual for Cs-13 7 to be present in vegetation. It is a constituent of nuclear weapons test fallout and nuclear plant accidents and has been observed in samples from indicator and control locations since the preoperational period. Table 3 .5 lists the highest indicator location annual mean and control location annual mean for Cs-137 since early in the station's operational history. Visual inspection of the tabular data did not reveal any increasing trends.

K-40 and Be-7 observed in broadleaf vegetation samples are naturally occurring radionuclides.

Figure 3.5 pCi/kg Concentration of Cs -137 in Broadleaf Vegetation 2500 - - ~ - ~ - ~ - ~ ~ - ~ - ~ - ~ - ~ - - ~ - ~ - ~ - ~ - - ~ - ~ - ~

lOOO 1500 a j

____ .a ; I

_ , __

1974 1978 1983 1988 1993 1998 2003 2008 20 13 2018

Indicate, lDcat 1on -.- control Locat ion - R<?por tinalevet 2011 concentration affected by Fukushima Daiichi Section 3 - Page 17

Table 3.5 Mean Concentration of Radionuclides in Vegetation Year Cs-137 Indicator (pCi/kg) Cs-137 Control (pCi/kg)

July 1974 - Dec. 1974 1.54E3 0.00E0 Jan. 1975 - June 1975 1.55E3 1.59E3 July 1975 - Dec. 1975 0.00E0 0.00E0 1976 0.00E0 0.00E0 1977 0.00E0 7.90E2 1978 1.19E2 8.19E1 1979 5.04E1 2.96E1 1980 2.80E1 1.55E1 1981 2.99E1 2.60E1 1982 2.42E1 2.62E1 1983 7.44E0 5.35E-1 1984 1.37E1 4.74E2 1985 1.62E1 2.20E2 1986 3.28E1 3.12E2 1987(1) 2.70E1 4.20E1 1988 2.40E1 7.50E1 1989 0.00E0 1.08E2 1990 2.73E2 1.74E2 1991 2.20E1 1.45E2 1992 0.00E0 1.46E2 1993 0.00E0 1.49E2 1994 0.00E0 1.06E2 1995 4.30E1 1.58E2 1996 3.79E1 1.83E2 1997 4.73E1 1.35E2 1998 7.28E1 1.61E2 1999 1.34E2 0.00E0 2000 1.06E2 0.00E0 2001 3.19E1 0.00E0 2002 8.44E1 0.00E0 2003 0.00E0 0.00E0 2004 0.00E0 5.96E1 2005 4.51E1 4.11E1 2006 1.77E1 0.00E0 2007 0.00E0 0.00E0 2008 0.00E0 0.00E0 2009 0.00E0 0.00E0 2010 0.00E0 0.00E0 2011 6.68E1 3.35E1 2012 0.00E0 0.00E0 2013 2.57E1 0.00E0 2014(2) 0.00E0 0.00E0 2015 0.00E0 0.00E0 2016 0.00E0 0.00E0 2017 3.94E1 0.00E0 2018 0.00E0 0.00E0 0.00E0 indicates no detectable measurements Control location changed to 073 in 1984 Qualitative results reported prior to 1974 Control location 081 added in 1998 1979 - 1986 mean based on all net activity Control location 073 removed in 1999 (1) 1987 - Gamma spectroscopy system change 2011 concentration affected by Fukushima Daiichi (2) 2014 Gamma spectroscopy system was replaced 10JUL2014. Gamma spectroscopy system hardware, detector cooling apparatus, software, electronics, nuclide identification libraries, and analytical test matrix components for test matrices were modified (NCR #

0739995). No analytical changes were noted due to the 2014 gamma spectroscopy system change.

Section 3 - Page 18

3.6 FISH In 2018, gamma spectroscopy was performed on 12 fish samples. Two downstream indicator locations and one control location were sampled. There were no gamma emitting radionuclides due to ONS plant operations identified in fish samples in 2018.

Figures 3.6-1 and 3.6-2 are graphs displaying the annual means for Cs-137 and Cs-134.

Historically, both are contributors to the calculated dose from liquid effluents from ingestion of fish. Radioactivity concentrations in downstream fish samples are higher than those reported in preoperational fish samples, however, concentrations in fish have decreased over time with decreases in radioactive material releases from the plant.

One factor affecting the trend analysis is a change in sampling locations. In 1984, a second downstream fish location was added. Location 063 is closer to the liquid effluent discharge point and has been the highest mean indicator since it was added.

Table 3.6 lists the highest indicator location annual means since the preoperational period for radionuclides detected in 2018. Also included in the table are radionuclides that have been identified in this media since the change in analysis systems in 1987. Comparison of data to previous years does not indicate any increases in concentrations.

K-40 observed in fish samples is a naturally occurring radionuclide.

Section 3 - Page 19

Figure 3.6-1 pCi/kg Concentration of Cs-137 in Fish isoo~-~-------~--~-~-------~--~----- ,-----------~------,--~

I 1970 1976 1961 1987 1993 19'l'l 2005 2011 2017

Indicat or Locac1on ......- Control Locat10n - Reporting level Figure 3.6-2 pCi/kg Concentration of Cs-134 in Fish I

700 ~ - - - - - - ~ - - ~ - - ~ - ~ - - - - ~ - - ~ - - ~ - ~ - - - - - - - ~ - ~ ~ - - - - - , - - ~

I 600 I I 500 I ] _-+--+--+---+---+--+--+--.--+--+---+ -

~

400 I

L~\

300 100 iii I

I ,\

, , , r 1

1 100

l I.. l ~ 1*. *1 It * * *

1

1 1*" I I a* .1 . a. ,.** ..... ** ..........

I "I

a* * *

j 1970 1976

t * * * * * * * *'- 11 ***a*********** a a a****

1961 1987 1993 1999 1005 2011 2017

Indicator l ocation

Control locat1on - so%Reporling Lenl Current reporting levels implemented 1984 Section 3 - Page 20

Table 3.6 Mean Concentrations of Radionuclides in Fish Year Co-58 (pCi/kg) Co-60 (pCi/kg) Cs-134 (pCi/kg) Cs-137 (pCi/kg)

Preop ending Jan.1971 0.00E0 0.00E0 0.00E0 1.46E2 Preop ending Jan.1973 0.00E0 0.00E0 0.00E0 1.66E2 Feb. 1973 - June 1973 Qualitative results reported-no significant measurements above background July 1973 - Dec. 1973 0.00E0 0.00E0 0.00E0 1.89E2 Jan. 1974 - June 1974 0.00E0 0.00E0 0.00E0 2.47E1 July 1974 - Dec. 1974 0.00E0 0.00E0 0.00E0 4.85E1 Jan. 1975 - June 1975 0.00E0 0.00E0 3.81E1 1.05E2 July 1975 - Dec. 1975 8.50E1 0.00E0 7.00E1 3.13E2 1976 5.70E1 1.14E2 7.73E1 1.66E2 1977 0.00E0 0.00E0 1.80E2 3.60E2 1978 3.27E2 0.00E0 3.31E2 0.00E0 1979 1.91E0 1.56E1 9.26E1 3.88E2 1980 1.45E1 1.90E1 1.10E2 3.99E2 1981 2.25E1 1.49E1 1.40E2 4.51E2 1982 9.83E-1 8.03E0 1.17E2 2.94E2 1983 3.35E1 4.53E0 1.24E2 3.32E2 1984 1.21E2 6.23E1 3.87E2 1.04E3 1985 1.62E1 1.10E1 7.93E1 2.85E2 1986 9.56E1 2.59E1 2.57E2 7.36E2 1987(1) 1.63E2 6.30E1 9.80E1 3.93E2 1988 9.60E1 0.00E0 7.20E1 2.60E2 1989 4.30E1 1.50E1 8.60E1 3.36E2 1990 1.50E1 0.00E0 4.80E1 1.19E2 1991 4.59E1 0.00E0 1.25E2 1.94E2 1992 6.10E1 0.00E0 4.80E1 1.36E2 1993 0.00E0 0.00E0 2.10E1 1.10E2 1994 0.00E0 0.00E0 2.80E1 1.05E2 1995 0.00E0 0.00E0 3.10E1 9.20E1 1996 0.00E0 0.00E0 4.49E1 1.25E2 1997 0.00E0 0.00E0 0.00E0 1.18E2 1998 0.00E0 0.00E0 0.00E0 5.79E1 1999 0.00E0 0.00E0 0.00E0 1.04E2 2000 0.00E0 0.00E0 0.00E0 7.54E1 2001 1.72E1 0.00E0 0.00E0 9.92E1 2002 0.00E0 0.00E0 0.00E0 9.37E1 2003 5.02E1 0.00E0 0.00E0 6.04E1 2004 0.00E0 0.00E0 0.00E0 5.29E1 2005 0.00E0 0.00E0 0.00E0 5.14E1 2006 0.00E0 0.00E0 0.00E0 5.58E1 2007 0.00E0 0.00E0 0.00E0 4.10E1 2008 0.00E0 0.00E0 0.00E0 3.13E1 2009 9.01E0 0.00E0 0.00E0 2.68E1 2010 0.00E0 0.00E0 0.00E0 2.69E1 2011 0.00E0 0.00E0 0.00E0 3.53E1 2012 1.23E2 3.61E1 0.00E0 4.32E1 2013 0.00E0 0.00E0 0.00E0 2.44E1 2014(2) 0.00E0 0.00E0 0.00E0 1.40E1 2015 0.00E0 0.00E0 0.00E0 1.94E1 2016 0.00E0 0.00E0 0.00E0 2.74E1 2017 0.00E0 0.00E0 0.00E0 1.73E1 2018 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 indicates no detectable measurements 1979 - 1986 mean based on all net activity (1) 1987 - Gamma spectroscopy system change (2) 2014 Gamma spectroscopy system was replaced 10JUL2014. Gamma spectroscopy system hardware, detector cooling apparatus, software, electronics, nuclide identification libraries, and analytical test matrix components for test matrices were modified (NCR # 0739995). No analytical changes were noted due to the 2014 gamma spectroscopy system change.

Section 3 - Page 21

3. 7 SHORELINE SEDIMENT Gamma spectroscopy was performed on six sediment samples. Two downstream indicator locations and one control location were sampled. Four samples were taken from indicator locations and two from the control location.

Cs-137 was identified in three of the four indicator location samples. Cs-137 was not identified in the control location samples. The highest 2018 individual sample Cs-13 7 concentration was 316 pCi/kg. Table 3.7 lists the highest indicator location annual means since shoreline sediment was initiated in 1984. Included in the table are radionuclides that have been identified in this media since the change in analysis systems in 1987.

Visual inspection of the tabular data did not reveal any trends. Figure 3.7 is a graph of the Cs-137 annual means. Historically, Cs-137 is a contributor to the calculated dose from liquid effluents from shoreline sediment. No trends are apparent.

K-40 and Be-7 observed in shoreline samples are naturally occurring radionuclides.

Figure 3.7 pCi/kg Concentration of Cs-137 in Shoreline Sediment 1000 , - - - - - - - , - - - - , - - - - , - - -- r - - -- . . . . - - - - , - - - - - , , - - - - - - , - - - . . . . . . , . - - - - r - - - -- , - ~

900 1984 1987 1990 1993 1996 1999 2002 2005 200S 2011 2014 2017

--a- 1nd1c<!tor Location 063 - r - 1ndicator Location 067 _..,,n dsca tcr Le cation 091 -+-- Cc ntrcl Loca;:ion 068 Th ere are no reporting levels for shoreline sediment Section 3 - Page 22

Table 3.7 Mean Concentrations of Radionuclides in Shoreline Sediment (pCi/kg)

Year Mn-54 Co-58 Co-60 Zn-65 Cs-134 Cs-137 Ag-110m Sb-125 1984 1.10E1 1.09E1 1.19E1 0.00E0 7.77E1 5.16E1 0.00E0 0.00E0 1985 9.39E0 1.27E0 4.79E0 0.00E0 7.63E1 9.47E1 0.00E0 0.00E0 1986 2.24E1 1.62E1 2.50E1 0.00E0 1.41E2 7.12E2 0.00E0 0.00E0 1987(1) 5.40E1 4.70E2 5.07E2 0.00E0 1.01E2 6.22E2 3.46E2 0.00E0 1988 3.30E1 1.20E2 1.87E2 6.70E1 6.60E1 7.59E2 1.62E2 3.67E2 1989 2.30E1 1.24E2 1.96E2 0.00E0 5.40E1 8.48E2 5.50E1 1.86E2 1990 3.40E1 8.00E1 2.59E2 0.00E0 4.50E1 5.36E2 1.71E2 9.00E1 1991 3.26E1 5.60E1 8.57E1 0.00E0 6.91E1 1.24E2 1.10E2 1.78E2 1992 8.79E1 1.79E2 1.12E2 0.00E0 5.60E1 3.31E2 1.69E2 2.08E2 1993 8.20E1 8.20E1 6.50E1 0.00E0 3.20E1 1.36E2 5.63E1 1.11E2 1994 5.30E1 7.00E1 1.49E2 0.00E0 6.70E1 2.38E2 1.04E2 1.29E2 1995 1.43E2 3.90E1 2.40E1 0.00E0 1.10E1 5.20E1 0.00E0 0.00E0 1996 0.00E0 5.10E1 0.00E0 0.00E0 1.98E1 1.19E2 0.00E0 0.00E0 1997 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 1.06E2 0.00E0 0.00E0 1998 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 1.01E2 0.00E0 0.00E0 1999 6.96E1 0.00E0 0.00E0 0.00E0 0.00E0 7.38E1 0.00E0 0.00E0 2000 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 8.54E1 0.00E0 0.00E0 2001 0.00E0 2.10E1 0.00E0 0.00E0 0.00E0 1.20E2 0.00E0 0.00E0 2002 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 6.96E1 0.00E0 0.00E0 2003 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 1.93E2 0.00E0 0.00E0 2004 8.54E1 0.00E0 0.00E0 0.00E0 0.00E0 9.56E1 0.00E0 0.00E0 2005 2.00E2 0.00E0 0.00E0 0.00E0 0.00E0 6.53E1 0.00E0 0.00E0 2006 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 5.01E1 0.00E0 0.00E0 2007 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 2.97E2 0.00E0 0.00E0 2008 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 1.78E2 0.00E0 0.00E0 2009 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 6.97E1 0.00E0 0.00E0 2010 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 1.15E2 0.00E0 0.00E0 2011 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 6.83E1 0.00E0 0.00E0 2012 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 6.35E1 0.00E0 0.00E0 2013 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 4.37E1 0.00E0 0.00E0 2014(2) 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 2.11E1 0.00E0 0.00E0 2015 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 2.24E1 0.00E0 0.00E0 2016 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 1.36E2 0.00E0 0.00E0 2017 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 1.22E2 0.00E0 0.00E0 2018 0.00E0 0.00E0 0.00E0 0.00E0 0.00E0 1.68E2 0.00E0 0.00E0 0.00E0 indicates no detectable measurements 1984 - 1986 mean based on all net activity (1) 1987 - Gamma spectroscopy system change (2) 2014 Gamma spectroscopy system was replaced 10JUL2014. Gamma spectroscopy system hardware, detector cooling apparatus, software, electronics, nuclide identification libraries, and analytical test matrix components for test matrices were modified (NCR # 0739995). No analytical changes were noted due to the 2014 gamma spectroscopy system change.

Section 3 - Page 23

3.8 DIRECT GAMMA RADIATION 3.8.1 ENVIRONMENTAL TLD Oconee is licensed with an exclusion area boundary defined by UFSAR Section 2.1.1.2 as a 1 mile radius from station center. This is the same boundary established for determining radioactive effluent release limits. No permanent public access is permitted within the exclusion area. TLD locations designated as "inner ring" were placed within exclusion area upon inception of the REMP and all are used as indicators. Due to close proximity with Oconee, inner ring TLD locations are not good indicators of radiation exposure to a member of the public, but are good at determining nearby environmental effects due to plant operation. Based on their placement, inner ring TLD locations are expected to occasionally be influenced by normal plant operation. TLD locations designated as "outer ring" are outside the 1 mile exclusion area but within a 5 mile radius of station center. In 2018, it was identified that Locations 077, 078.1, 085, 086, 087, 088, 089, and 090 were changed from a measurement type of Special Interest to Inner Ring for 2017 and 2018 TLD data (NCR# 02266080). All outer ring TLD locations are used as indicators. A subset of TLD locations within a 7 to 13 mile radius from station center are designated as "special interest." The two "control" locations are greater than 9 miles from station center. These locations were chosen to reduce the probability of influence from Oconee operation on data. The control locations are not used as background subtraction in the TLD analysis. Their purpose is to provide a comparison to indicator locations.

In 2018, 200 total TLDs were analyzed, 192 at indicator locations and 8 at control locations. TLDs are collected and analyzed quarterly. Transit and laboratory background dose is determined and subtracted from gross field readings as required by ANSI N545-1975. Based on Appendix B TLD data, the highest annual total dose was 114 mrem at indicator location 024, 0.81 miles E of station center. Figure 3.8 and Table 3.8-A show TLD inner ring, outer ring, and control location annual averages in mrem per year. Data is provided from 1984 when TLD locations were added and arranged in an inner ring and outer ring configuration. Preoperational data is also provided in the table. As shown in the graph, historical inner and outer ring averages compare similarly, while control data is somewhat higher. This is most likely an artifact of the underlying geologic structures at the control locations.

Comparing data from the 2018 Oconee Annual Radiological Effluent Release Report (ARERR), dose to a member of the public resulting from gaseous effluent releases at Oconee is a small fraction of measured TLD dose. Therefore, it can be concluded that gaseous effluents from Oconee had negligible impact on measured TLD values.

Starting in 2014, enhanced analytical methods were implemented. Quarterly and annual baseline dose was determined using appropriate statistical methods considering data from 2000 through 2012. Quarterly and annual dose for 2018 was compared to baseline values to determine if an Investigation Level had been exceeded for evaluation of potential dose to a member of the public. No TLD location exceeded the Quarterly or Annual Investigation Level in 2018 due to plant operations, Section 3 - Page 24

therefore no evaluation of dose to a member of the public from direct or scattered radiation was performed. Table 3.8-B summarizes the data.

A TLD intercomparison program is conducted as part of the quality assurance program. Results of this program are included in section 5.7.

3.8.2 ISFSI The Oconee ISFSI began operation in 1990. It is located 0.25 miles southwest of station center in a secured area specifically constructed to provide dry storage for spent nuclear fuel. The ISFSI employs the NUHOMS horizontal storage module design. Irradiated fuel assemblies are confined, protected, and shielded by a reinforced concrete module. The system is completely passive and designed to provide shielding and safe confinement of spent fuel for a range of postulated accident conditions and natural phenomena. Decay heat is removed from the module by a passive ventilation system. No radiological liquid or gaseous effluents are expected from the passive storage provided by the ISFSI. Therefore, any dose to offsite locations would be from direct and scattered gamma radiation.

The Oconee REMP serves as the operational program for the ISFSI. Several environmental TLD locations are presently located at the Oconee site boundary fence near the ISFSI. The closest of these is 0.3 miles from the ISFSI, well within the 1 mile exclusion boundary. In addition, dose rates at the ISFSI restricted area fence are monitored with TLDs as part of the routine REMP. These are used, in part, to control occupational exposure and augment the REMP according to the Oconee ISFSI UFSAR. The maximum TLD dose at the ISFSI fence, which is not accessible to the public, was 589 mrem per standard quarter. This is consistent with previous measurements.

Section 3 - Page 25

Figure 3.8 mrem/year Direct Gamma Radiation (TLD) Results 250 200 100 *- * ....... . ----... ..._._. . .----

.-.*1"*- *.._.,.*~*l---.-...t:--=

~.:--:.-1-:~~u::.-.;*~*~*.___.-.11-,--.*~11-- . .

50 0

1984 1988 1992 1996 2000 2004 200S 2012 2016

~ Inner Ring -a OutorRing ----- cont rol There is no repo~ting level for Direct Radiation (TLD)

Section 3 - Page 26

Table 3.8-A Direct Gamma Radiation (TLD) Results(1)

Inner Ring Average Outer Ring Average Control Average Year (mrem/yr) (mrem/yr) (mrem/yr)

Preoperational 1.07E2 1.18E2 1.42E2 1984 7.54E1 7.96E1 1.05E2 1985 1.11E2 1.15E2 1.49E2 1986 9.90E1 1.01E2 1.43E2 1987 8.01E1 8.44E1 9.91E1 1988 6.87E1 7.47E1 1.07E2 1989 6.05E1 5.86E1 8.49E1 1990 4.96E1 4.82E1 6.66E1 1991 5.81E1 6.18E1 8.36E1 1992 7.24E1 6.95E1 8.74E1 1993 7.11E1 7.66E1 8.84E1 1994 8.25E1 9.00E1 1.06E2 1995 8.89E1 9.66E1 1.25E2 1996 6.51E1 7.44E1 9.60E1 1997 6.92E1 7.96E1 9.93E1 1998 6.81E1 7.68E1 1.12E2 1999 7.08E1 7.84E1 9.88E1 2000 7.24E1 8.03E1 1.00E2 2001 6.99E1 7.83E1 9.71E1 2002 7.28E1 8.11E1 1.03E2 2003 7.36E1 8.23E1 1.03E2 2004 7.61E1 8.31E1 1.05E2 2005 7.54E1 8.46E1 9.95E1 2006 7.79E1 8.57E1 1.04E2 2007 7.70E1 8.55E1 1.03E2 2008 8.04E1 9.03E1 1.05E2 2009 8.08E1 8.98E1 1.06E2 2010 7.94E1 8.85E1 9.77E1 2011 7.96E1 8.91E1 1.05E2 2012 7.89E1 8.79E1 1.05E2 2013 7.83E1 8.84E1 1.06E2 2014 7.58E1 8.46E1 1.05E2 2015 7.48E1 8.67E1 1.04E2 2016 7.59E1 8.65E1 1.06E2 2017 7.32E1 8.17E1 1.01E2 2018 7.95E1 8.68E1 1.07E2 (1) In the 2014 AREOR, tabular results were converted from mR/yr to mrem/yr (n

0.95).

Section 3 - Page 27

Table 3.8-B Direct Gamma Radiation (TLD) Oconee 2018 Investigation Level Oconee 2018 MDDQ: 7 Oconee 2018 MDDA: 11 Quarterly (mrem) Annual(mrem)

Location BQ MQQ1 MQQ2 MQQ3 MQQ4 LQQ1 LQQ2 LQQ3 LQQ4 BA M A* LA 20 18.9 21.9 18.3 17.1 19.4 ND ND ND ND 75.7 76.7 ND 21 14.0 15.7 14.5 13.8 16.1 ND ND ND ND 56.9 60.0 ND 22 21.8 24.7 23.4 20.2 23.1 ND ND ND ND 89.7 91.4 ND 23 21.9 23.8 22.6 19.9 20.9 ND ND ND ND 87.8 87.1 ND 24*** 27.4 31.0 28.5 26.5 28.0 ND ND ND ND 108.4 114.0 ND 25 17.1 19.3 17.2 15.9 16.7 ND ND ND ND 72.9 69.1 ND 26 16.5 17.6 17.2 16.2 16.2 ND ND ND ND 67.2 67.3 ND 27 19.2 18.8 19.0 17.4 18.3 ND ND ND ND 78.1 73.5 ND 28 17.0 16.2 16.2 16.4 17.8 ND ND ND ND 68.3 66.7 ND 29 15.7 17.6 15.2 14.6 16.8 ND ND ND ND 63.3 64.2 ND 30 17.0 20.2 17.8 17.1 17.5 ND ND ND ND 70.6 72.6 ND 31 16.4 17.6 16.6 15.7 17.5 ND ND ND ND 65.7 67.4 ND 32 22.9 21.5 19.4 17.2 19.9 ND ND ND ND 94.5 77.9 ND 33 19.5 18.1 18.0 15.8 18.5 ND ND ND ND 77.9 70.3 ND 34 21.5 20.6 17.7 17.1 18.7 ND ND ND ND 86.0 74.1 ND 35 22.9 25.2 23.3 21.8 22.9 ND ND ND ND 93.3 93.1 ND 36 26.5 28.1 26.5 23.8 26.0 ND ND ND ND 105.1 104.5 ND 37 20.4 19.9 18.2 15.5 18.1 ND ND ND ND 82.0 71.6 ND 38 21.9 23.4 21.6 19.4 22.0 ND ND ND ND 87.5 86.4 ND 39 24.2 23.8 24.2 22.0 24.7 ND ND ND ND 96.2 94.8 ND 40 23.7 30.1 26.7 23.4 25.7 ND ND ND ND 101.1 105.8 ND 41 17.3 18.2 17.0 16.0 17.0 ND ND ND ND 69.1 68.2 ND 42 25.0 26.7 25.7 24.7 25.4 ND ND ND ND 102.2 102.4 ND 43 23.8 25.4 23.6 21.6 23.8 ND ND ND ND 95.3 94.3 ND 44 18.3 20.7 18.6 18.3 18.6 ND ND ND ND 80.0 76.3 ND 45 17.0 18.1 17.0 16.1 17.5 ND ND ND ND 67.9 68.6 ND 46 21.5 23.7 23.8 22.1 23.2 ND ND ND ND 91.8 92.7 ND 47 22.4 24.1 21.9 21.2 ND ND ND ND 91.1 89.7 ND 48 25.3 25.8 25.5 22.2 25.0 ND ND ND ND 101.3 98.5 ND 50 20.7 23.0 21.6 20.4 21.6 ND ND ND ND 82.6 86.5 ND 51 19.0 20.8 17.9 17.6 19.5 ND ND ND ND 76.2 75.7 ND 52 22.9 26.3 25.4 21.2 22.8 ND ND ND ND 94.8 95.7 ND 53 25.1 28.5 23.7 22.8 25.2 ND ND ND ND 102.3 100.1 ND 54 18.5 19.6 18.1 16.9 19.1 ND ND ND ND 76.5 73.7 ND 55 15.5 16.2 15.0 14.3 15.8 ND ND ND ND 65.1 61.3 ND 56 22.8 22.9 23.3 21.5 23.4 ND ND ND ND 91.8 91.0 ND 57 22.4 27.1 24.5 20.1 19.5 ND ND ND ND 93.6 91.2 ND 58 29.3 32.5 31.4 27.2 29.5 ND ND ND ND 119.7 120.7 ND 59 24.1 25.7 23.5 22.3 24.6 ND ND ND ND 98.5 96.0 ND 76 20.8 27.7 25.2 21.4 24.9 ND ND ND ND 89.0 99.2 ND 77** 17.9 20.0 17.2 16.2 18.1 ND ND ND ND 69.6 71.5 ND 78.1** 25.6 28.1 28.9 24.1 25.9 ND ND ND ND 97.8 107.1 ND 81 21.9 26.0 21.8 21.5 23.8 ND ND ND ND 91.1 93.0 ND 85** 18.3 20.1 19.9 18.1 18.9 ND ND ND ND 73.1 77.0 ND 86** 16.3 16.9 17.1 15.7 15.8 ND ND ND ND 63.7 65.5 ND 87** 16.7 18.3 18.1 16.5 17.5 ND ND ND ND 63.9 70.4 ND 88** 20.3 20.9 21.7 19.7 20.7 ND ND ND ND 76.1 82.9 ND 89** 21.6 23.5 23.8 21.4 22.6 ND ND ND ND 82.0 91.3 ND 90** 23.4 25.7 24.3 21.9 23.2 ND ND ND ND 90.7 95.1 ND 92**** 21.8

Ma determined by normalizing available quarterly data to 4 full quarters

- Test Locations added to ODCM for 2017Q1 (ONS ODCM Revision 58), baseline analysis ongoing (NCR # 02035669)

Section 3 - Page 28

- - Location 24 re-baseline in progress due to changes in local environment

- - - Location 92 was added to the ODCM for 2018Q4 (ONS ODCM Revision 59, baseline analysis ongoing).

--- indicates no data resulting from missing TLD, erroneous TLD reading, or omitted after investigation Note Location exceeded investigation level, determined attributable to TLD location changes around/near TLD, not plant operation.

Note: Data may be omitted after investigation considering the following: (1) Other TLD locations data from upwind, downwind, and adjacent sectors (2) Review of documentation on location's characteristics, geography, topography, etc. (3) Comparison with other Table 3.8-B radiological datadefinition of terms (i.e. gaseous effluent releases, direct radiation reports, surveys, dose calculations, Area TLDs, etc.).

MDDQ = minimum differential dose, quarterly, 3 times 90th percentile sQ determined from analysis in mrem MDDA = minimum differential dose, annual, 3 times 90th percentile sA determined from analysis in mrem BQ = Quarterly baseline (mrem)

MQ = locations 91 day standard quarter normalized dose (mrem per standard quarter) averaged between multiple TLDs at each location.

LQ = quarterly investigation level dose (mrem)

BA = baseline background dose (mrem) (annual)

MA = annual monitoring data - Ma determined by normalizing available quarterly data to 4 full quarters LA = annual investigation level dose (mrem)

ND = not detected Section 3 - Page 29

3.9 LAND USE CENSUS The Land Use Census was conducted during the growing season (5/22 - 5/23/2018) as required by SLC 16.11.6. Table 3.9 summarizes census results. A map indicating identified locations is shown in Figure 3.9. The nearest residence is located in the NNW sector at 1.03 miles, and there were no milk locations identified during the performance of the land use census. No program changes were required based on the results of the census.

Table 3.9 Oconee 2018 Land Use Census Results*

Nearest Pathways (Miles)

RESIDENCE MILK ANIMAL SECTOR 2017 2018 2017 2018 North 2.98 2.98 --- ---

North-Northeast 1.84 1.84 --- ---

Northeast 1.20 1.20 --- ---

East-Northeast 1.34 1.34 --- ---

East 1.64 1.64 4.66*(1) ---*

East-Southeast 1.57 1.57 --- ---

Southeast 1.46 1.46 --- ---

South-Southeast 1.54 1.54 --- ---

South 1.96 1.96 --- ---

South-Southwest 1.34 1.34 --- ---

Southwest 1.27 1.27 --- ---

West-Southwest 1.76 1.73* --- ---

West 1.58 1.58 --- ---

West-Northwest 1.35 1.35 --- ---

Northwest 1.04 1.04 --- ---

North-Northwest 1.03 1.03 --- ---

NOTE: Sector and distances were determined by Global Positioning System

Represents a change from the previous year

--- Indicates no occurrences within the 5 mile radius (1) Goat milk used to feed goat kids. Milk not used for human consumption (NCR #02132422).

Section 3 - Page 30

Figure 3.9 Oconee Nuclear Station 2018 Land Use Census Map Legend

ONS Residence

/'../ ONS Railroads NavteqHwys NavteqStreets CJ States

[= ] Counties

- NHDWaterbody Approximate location of features shown 0 0.5 ProJection NCSP NAD27 2 Miles Section 3 - Page 31

4.0 EVALUATION OF DOSE 4.1 DOSE FROM ENVIRONMENTAL MEASUREMENTS Annual doses to maximum exposed individuals were estimated based on measured concentrations of radionuclides in 2018 ONS REMP samples. The primary purpose of estimating doses based on sample results is to allow comparison to effluent program dose estimates. Doses based on sample results were conservatively calculated in a manner as equivalent as possible to effluent-based dose estimates.

Doses based on REMP sample results were calculated using the methodology and data presented in NRC Regulatory Guide 1.109. Measured radionuclide concentrations, averaged over the entire year for a specific radionuclide, indicator location, and sample type, were used to calculate REMP-based doses, after subtracting the applicable average background concentration (as measured at the corresponding control location). Regulatory Guide 1.109 consumption rates for the maximum exposed individual were used in the calculations. A dose factor of zero was assumed when the guide listed NO DATA as the dose factor for a given radionuclide and organ.

Maximum dose estimates calculated using drinking water, fish, and shoreline sediment results are reported in Table 4.1-A. The individual critical population and pathway dose calculations are contained in Table 4.1-B.

No radionuclides attributable to ONS operations were detected in milk, broadleaf vegetation, airborne radioiodine or airborne particulate samples. Naturally occurring K-40 and Be-7 were detected in some samples but were not included in any REMP-based dose estimates. Dose estimates were not calculated for surface water samples because surface water is not considered a potable drinking water source although surface water tritium concentrations are used in calculating doses from fish. REMP TLD exposure results are discussed in Section 3.8.

The maximum environmental organ dose estimate for any single sample type (excluding TLD results) collected during 2018 was 3.694E-2 mrem to the child, liver, total body, thyroid, kidney, lung, and GI-LLI from the consumption of drinking water.

4.2 ESTIMATED DOSE FROM RELEASES Throughout the year, dose estimates were calculated based on actual 2018 liquid and gaseous effluent release data. Effluent-based dose estimates were calculated using OpenEMS which employs methodology and data presented in NRC Regulatory Guide 1.109. These doses are shown in Table 4.1-A along with the corresponding REMP-based dose estimates. Summaries of OpenEMS dose calculations are reported in the Annual Radioactive Effluent Release Report.

Section 4 - Page 1

The effluent-based liquid release doses are summations of the dose contributions of the drinking water, fish, and shoreline pathways. For iodine, particulate, and tritium exposure the effluent-based gaseous release doses are summations of the dose contributors from ground/plane, milk, inhalation and vegetation pathways.

4.3 COMPARISON OF DOSES The liquid environmental and release data doses given in Table 4.1-A agree reasonably well.

The similarity of the doses indicates that the radioactivity levels in the environment do not differ significantly from those expected based on effluent measurements and modeling of the environmental exposure pathways.

There are some differences in how effluent and environmental doses are calculated that affect the comparison. Doses calculated from environmental data are conservative because they are based on a mean that includes only samples with a net positive activity versus a mean that includes all sample results (i.e. zero results are not included in the mean). Also, airborne tritium is not measured in environmental samples but is used to calculate effluent doses.

Additionally, in 2010 Oconee began reporting estimated dose from effluent Carbon 14 (C-14).

This change came about with the issuing of Regulatory Guide 1.21, Revision 2, Measuring, Evaluating and Reporting Radioactive Material in Liquid and Gaseous Effluents and Solid Waste. A description of this change is found in the 2010 Annual Radiological Effluent Release Report. C-14 is not easily measured in the environment and therefore, environmental and effluent doses from C-14 cannot be compared directly.

In calculations based on liquid release effluent pathways, fish, drinking water, and shoreline sediment were the predominant dose pathways based on environmental and effluent samples.

The maximum total organ dose based on 2018 environmental sample results was 4.14E-02 mrem to the child total body. The maximum total organ dose of 2.07E-1 mrem for liquid effluent-based estimates was to the adult GI-LLI.

The gaseous effluent dose is due to C-14 and tritium in broadleaf vegetation. The maximum total organ dose for gaseous effluent estimates was 3.40E-1 mrem to the child bone, with C-14 being the primary dose contributor. There was no gaseous release pathway media that contained detectable activity.

The doses calculated do not exceed 40CFR190 or 10CFR50 dose commitment limits for members of the public. Doses to members of the public attributable to the operation of ONS are being maintained well within regulatory limits and are described in the Annual Radiological Effluent Release Report (ARERR).

Section 4 - Page 2

TABLE 4.1-A Page 1 of 2 OCONEE NUCLEAR STATION 2018 ENVIRONMENTAL AND EFFLUENT DOSE COMPARISON LIQUID RELEASE PATHWAY Environmental Critical Critical Maximum Dose (3)

Organ or Location Age (1) Pathway (2) (mrem)

Effluent Data Skin Environmental Teen Shoreline Sediment 091 (2.09 mi S) 4.41E-04 Skin Effluent Teen N/A Discharge Pt. 3.94E-04 Bone Environmental - - - -

Bone Effluent Child N/A Discharge Pt. 7.56E-03 Liver Environmental Child Drinking Water 066 (18.9 mi SSE) 4.13E-02 Liver Effluent Child N/A 18.9 mi SSE 1.36E-01 T. Body Environmental Child Drinking Water 066 (18.9 mi SSE) 4.14E-02 T. Body Effluent Child N/A 18.9 mi SSE 1.35E-01 Thyroid Environmental Child Drinking Water 066 (18.9 mi SSE) 4.13E-02 Thyroid Effluent Child N/A 18.9 mi SSE 1.34E-01 Kidney Environmental Child Drinking Water 066 (18.9 mi SSE) 4.13E-02 Kidney Effluent Child N/A 18.9 mi SSE 1.35E-01 Lung Environmental Child Drinking Water 066 (18.9 mi SSE) 4.13E-02 Lung Effluent Child N/A 18.9 mi SSE 1.35E-01 GI-LLI Environmental Child Drinking Water 066 (18.9 mi SSE) 4.13E-02 GI-LLI Effluent Child N/A 18.9 mi SSE 2.07E-01 (1) Critical Age is the highest total dose (all pathways) to an age group.

(2) Critial Pathway is the highest individual dose within the identified Critical Age group. Not available at time of report compilation.

(3) Maximum dose is a summation of the fish, drinking water and shoreline sediment pathways.

Section 4 - Page 3

Page 2 of 2 GASEOUS RELEASE PATHWAY IODINE, PARTICULATE, and TRITIUM Environmental or Critical Critical Maximum Dose (3)

Organ Location Effluent Data Age (1) Pathway (2) (mrem)

Skin Environmental - - - -

Skin Effluent Teen N/A 1.0 mi. NE 1.44E-07 Bone Environmental - - - -

Bone Effluent Child N/A 1.0 mi. SW 3.40E-01 Liver Environmental - - - -

Liver Effluent Child N/A 1.0 mi. SW 1.19E-01 T. Body Environmental - - - -

T. Body Effluent Child N/A 1.0 mi. SW 1.19E-01 Thyroid Environmental - - - -

Thyroid Effluent Child N/A 1.0 mi. SW 1.19E-01 Kidney Environmental - - - -

Kidney Effluent Child N/A 1.0 mi. SW 1.19E-01 Lung Environmental - - - -

Lung Effluent Child N/A 1.0 mi. SW 1.19E-01 GI-LLI Environmental - - - -

GI-LLI Effluent Child N/A 1.0 mi. SW 1.19E-01 (1) Critical Age is the highest total dose (all pathways) to an age group.

(2) Critial Pathway is the highest individual dose within the identified Critical Age group. Not available at time of report compilation.

(3) Maximum dose is a summation of the ground/plane, inhalation, milk and vegetation pathways.

Section 4 - Page 4

TABLE 4.1-B Maximum Individual Dose for 2018 based on Environmental Measurements (mrem) for Oconee Nuclear Station Age Sample Medium Bone Liver T. Body Thyroid Kidney Lung GI-LLI Skin Infant Airborne 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Drinking Water 0.00E+00 3.62E-02 3.62E-02 3.62E-02 3.62E-02 3.62E-02 3.62E-02 0.00E+00 Milk 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 TOTAL 0.00E+00 3.62E-02 3.62E-02 3.62E-02 3.62E-02 3.62E-02 3.62E-02 0.00E+00 Child Airborne 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Drinking Water 0.00E+00 3.69E-02 3.69E-02 3.69E-02 3.69E-02 3.69E-02 3.69E-02 0.00E+00 Milk 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Broadleaf Vegetation 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Fish 0.00E+00 4.44E-03 4.44E-03 4.44E-03 4.44E-03 4.44E-03 4.44E-03 0.00E+00 Shoreline Sediment 0.00E+00 0.00E+00 7.90E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9.22E-05 TOTAL 0.00E+00 4.13E-02 4.14E-02 4.13E-02 4.13E-02 4.13E-02 4.13E-02 9.22E-05 Teen Airborne 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Drinking Water 0.00E+00 1.92E-02 1.92E-02 1.92E-02 1.92E-02 1.92E-02 1.92E-02 0.00E+00 Milk 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Broadleaf Vegetation 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Fish 0.00E+00 5.37E-03 5.37E-03 5.37E-03 5.37E-03 5.37E-03 5.37E-03 0.00E+00 Shoreline Sediment 0.00E+00 0.00E+00 3.78E-04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.41E-04 TOTAL 0.00E+00 2.46E-02 2.49E-02 2.46E-02 2.46E-02 2.46E-02 2.46E-02 4.41E-04 Adult Airborne 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Drinking Water 0.00E+00 2.73E-02 2.73E-02 2.73E-02 2.73E-02 2.73E-02 2.73E-02 0.00E+00 Milk 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Broadleaf Vegetation 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Fish 0.00E+00 6.99E-03 6.99E-03 6.99E-03 6.99E-03 6.99E-03 6.99E-03 0.00E+00 Shoreline Sediment 0.00E+00 0.00E+00 6.77E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 7.90E-05 TOTAL 0.00E+00 3.43E-02 3.44E-02 3.43E-02 3.43E-02 3.43E-02 3.43E-02 7.90E-05 Note: Dose tables are provided for sample media displaying positive nuclide occurrence.

Section 4 - Page 5

Oconee Nuclear Station Dose from Drinking Water Pathway for 2018 Data Maximum Exposed Infant Infant Dose from Drinking Water Pathway (mrem) = Usage (l) x Dose Factor (mrem/pCi ingested) x Concentration (pCi/l)

Usage (intake in one year) = 330 l Highest Annual Net Mean Ingestion Dose Factor Concentration Dose (mrem)

Indicator Water Radionuclide Bone Liver T. Body Thyroid Kidney Lung GI-LLI Location (pCi/l) Bone Liver T. Body Thyroid Kidney Lung GI-LLI Mn-54 NO DATA 1.99E-05 4.51E-06 NO DATA 4.41E-06 NO DATA 7.31E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Co-58 NO DATA 3.60E-06 8.98E-06 NO DATA NO DATA NO DATA 8.97E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Fe-59 3.08E-05 5.38E-05 2.12E-05 NO DATA NO DATA 1.59E-05 2.57E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Co-60 NO DATA 1.08E-05 2.55E-05 NO DATA NO DATA NO DATA 2.57E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Zn-65 1.84E-05 6.31E-05 2.91E-05 NO DATA 3.06E-05 NO DATA 5.33E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Nb-95 4.20E-08 1.73E-08 1.00E-08 NO DATA 1.24E-08 NO DATA 1.46E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Zr-95 2.06E-07 5.02E-08 3.56E-08 NO DATA 5.41E-08 NO DATA 2.50E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 I-131 3.59E-05 4.23E-05 1.86E-05 1.39E-02 4.94E-05 NO DATA 1.51E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Cs-134 3.77E-04 7.03E-04 7.10E-05 NO DATA 1.81E-04 7.42E-05 1.91E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Cs-137 5.22E-04 6.11E-04 4.33E-05 NO DATA 1.64E-04 6.64E-05 1.91E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BaLa-140 1.71E-04 1.71E-07 8.81E-06 NO DATA 4.06E-08 1.05E-07 4.20E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 H-3 NO DATA 3.08E-07 3.08E-07 3.08E-07 3.08E-07 3.08E-07 3.08E-07 066 356 0.00E+00 3.62E-02 3.62E-02 3.62E-02 3.62E-02 3.62E-02 3.62E-02 Dose Commitment (mrem) = 0.00E+00 3.62E-02 3.62E-02 3.62E-02 3.62E-02 3.62E-02 3.62E-02 Section 4 - Page 6

Oconee Nuclear Station Dose from Drinking Water Pathway for 2018 Data Maximum Exposed Child Child Dose from Drinking Water Pathway (mrem) = Usage (l) x Dose Factor (mrem/pCi ingested) x Concentration (pCi/l)

Usage (intake in one year) = 510 l Highest Annual Net Mean Ingestion Dose Factor Concentration Dose (mrem)

Indicator Water Radionuclide Bone Liver T. Body Thyroid Kidney Lung GI-LLI Location (pCi/l) Bone Liver T. Body Thyroid Kidney Lung GI-LLI Mn-54 NO DATA 1.07E-05 2.85E-06 NO DATA 3.00E-06 NO DATA 8.98E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Co-58 NO DATA 1.80E-06 5.51E-06 NO DATA NO DATA NO DATA 1.05E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Fe-59 1.65E-05 2.67E-05 1.33E-05 NO DATA NO DATA 7.74E-06 2.78E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 C0-60 NO DATA 5.29E-06 1.56E-05 NO DATA NO DATA NO DATA 2.93E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Zn-65 1.37E-05 3.65E-05 2.27E-05 NO DATA 2.30E-05 NO DATA 6.41E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Nb-95 2.25E-08 8.76E-09 6.26E-09 NO DATA 8.23E-09 NO DATA 1.62E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Zr-95 1.16E-07 2.55E-08 2.27E-08 NO DATA 3.65E-08 NO DATA 2.66E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 I-131 1.72E-05 1.73E-05 9.83E-06 5.72E-03 2.84E-05 NO DATA 1.54E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Cs-134 2.34E-04 3.84E-04 8.10E-05 NO DATA 1.19E-04 4.27E-05 2.07E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Cs-137 3.27E-04 3.13E-04 4.62E-05 NO DATA 1.02E-04 3.67E-05 1.96E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BaLa-140 8.31E-05 7.28E-08 4.85E-06 NO DATA 2.37E-08 4.34E-08 4.21E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 H-3 NO DATA 2.03E-07 2.03E-07 2.03E-07 2.03E-07 2.03E-07 2.03E-07 066 356 0.00E+00 3.69E-02 3.69E-02 3.69E-02 3.69E-02 3.69E-02 3.69E-02 Dose Commitment (mrem) = 0.00E+00 3.69E-02 3.69E-02 3.69E-02 3.69E-02 3.69E-02 3.69E-02 Section 4 - Page 7

Oconee Nuclear Station Dose from Fish Pathway for 2018 Data Maximum Exposed Child Child Dose from Fish Pathway (mrem) = Usage (kg) x Dose Factor (mrem/pCi ingested) x Concentration (pCi/kg)

H-3 Concentration in Fish = Surface Water pCi/l x Bioaccumulation Factor 0.9 pCi/kg per pCi/l = 3520 pCi/l x 0.9 =3168 pCi/kg Usage (intake in one year) = 6.9 kg Highest Annual Net Mean Ingestion Dose Factor Concentration Dose (mrem)

Indicator Fish Radionuclide Bone Liver T. Body Thyroid Kidney Lung GI-LLI Location (pCi/kg) Bone Liver T. Body Thyroid Kidney Lung GI-LLI Mn-54 NO DATA 1.07E-05 2.85E-06 NO DATA 3.00E-06 NO DATA 8.98E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Co-58 NO DATA 1.80E-06 5.51E-06 NO DATA NO DATA NO DATA 1.05E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Fe-59 1.65E-05 2.67E-05 1.33E-05 NO DATA NO DATA 7.74E-06 2.78E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 C0-60 NO DATA 5.29E-06 1.56E-05 NO DATA NO DATA NO DATA 2.93E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Zn-65 1.37E-05 3.65E-05 2.27E-05 NO DATA 2.30E-05 NO DATA 6.41E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Cs-134 2.34E-04 3.84E-04 8.10E-05 NO DATA 1.19E-04 4.27E-05 2.07E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Cs-137 3.27E-04 3.13E-04 4.62E-05 NO DATA 1.02E-04 3.67E-05 1.96E-06 ALL 0.0 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 H-3 NO DATA 2.03E-07 2.03E-07 2.03E-07 2.03E-07 2.03E-07 2.03E-07 063 3168 0.00E+00 4.44E-03 4.44E-03 4.44E-03 4.44E-03 4.44E-03 4.44E-03 Dose Commitment (mrem) = 0.00E+00 4.44E-03 4.44E-03 4.44E-03 4.44E-03 4.44E-03 4.44E-03 Section 4 - Page 8

Oconee Nuclear Station Dose from Shoreline Sediment Pathway for 2018 Data Maximum Exposed Child Shoreline Recreation = 14 hr (in one year)

Shore Width Factor = 0.2 Sediment Surface Mass = 40 kg/m2 Child Dose from Shoreline Sediment Pathway (mrem) = Shoreline Recreation (hr) x External Dose Factor (mrem/hr per pCi/m2) x Shore Width Factor x Sediment Surface Mass (kg/m2) x Sediment Concentration (pCi/kg)

External Dose Factor Standing Highest Annual Net Dose on Contaminated Ground Mean Concentration (mrem/hr per pCi/m2) Indicator Sediment (mrem)

Radionuclide T. Body Skin Location (pCi/kg) T. Body Skin Cs-134 1.20E-08 1.40E-08 ALL 0.00 0.00E+00 0.00E+00 Cs-137 4.20E-09 4.90E-09 091 168 7.90E-05 9.22E-05 Dose Commitment (mrem) = 7.90E-05 9.22E-05 Section 4 - Page 9

Oconee Nuclear Station Dose from Drinking Water Pathway for 2018 Data Maximum Exposed Teen Teen Dose from Drinking Water Pathway (mrem) = Usage (l) x Dose Factor (mrem/pCi ingested) x Concentration (pCi/l)

Usage (intake in one year)= 510 l Highest Annual Net Mean Ingestion Dose Factor Concentration Dose (mrem)

Indicator Water Radionuclide Bone Liver T. Body Thyroid Kidney Lung GI-LLI Location (pCi/l) Bone Liver T. Body Thyroid Kidney Lung GI-LLI Mn-54 NO DATA 5.90E-06 1.17E-06 NO DATA 1.76E-06 NO DATA 1.21E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Co-58 NO DATA 9.72E-07 2.24E-06 NO DATA NO DATA NO DATA 1.34E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Fe-59 5.87E-06 1.37E-05 5.29E-06 NO DATA NO DATA 4.32E-06 3.24E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Co-60 NO DATA 2.81E-06 6.33E-06 NO DATA NO DATA NO DATA 3.66E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Zn-65 5.76E-06 2.00E-05 9.33E-06 NO DATA 1.28E-05 NO DATA 8.47E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Nb-95 8.22E-09 4.56E-09 2.51E-09 NO DATA 4.42E-09 NO DATA 1.95E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Zr-95 4.12E-08 1.30E-08 8.94E-09 NO DATA 1.91E-08 NO DATA 3.00E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 I-131 5.85E-06 8.19E-06 4.40E-06 2.39E-03 1.41E-05 NO DATA 1.62E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Cs-134 8.37E-05 1.97E-04 9.14E-05 NO DATA 6.26E-05 2.39E-05 2.45E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Cs-137 1.12E-04 1.49E-04 5.19E-05 NO DATA 5.07E-05 1.97E-05 2.12E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BaLa-140 2.84E-05 3.48E-08 1.83E-06 NO DATA 1.18E-08 2.34E-08 4.38E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 H-3 NO DATA 1.06E-07 1.06E-07 1.06E-07 1.06E-07 1.06E-07 1.06E-07 066 356 0.00E+00 1.92E-02 1.92E-02 1.92E-02 1.92E-02 1.92E-02 1.92E-02 Dose Commitment (mrem)= 0.00E+00 1.92E-02 1.92E-02 1.92E-02 1.92E-02 1.92E-02 1.92E-02 Section 4 - Page 10

Oconee Nuclear Station Dose from Fish Pathway for 2018 Data Maximum Exposed Teen Teen Dose from Fish Pathway (mrem) = Usage (kg) x Dose Factor (mrem/pCi ingested) x Concentration (pCi/kg)

H-3 Concentration in Fish = Surface Water pCi/l x Bioaccumulation Factor 0.9 pCi/kg per pCi/l = 3520 pCi/l x 0.9 = 3168 pCi/kg Usage (intake in one year) = 16 kg Highest Annual Ingestion Dose Factor Net Mean Dose (mrem)

Concentration Radionuclide Bone Liver T. Body Thyroid Kidney Lung GI-LLI Location (pCi/kg) Bone Liver T. Body Thyroid Kidney Lung GI-LLI Mn-54 NO DATA 5.90E-06 1.17E-06 NO DATA 1.76E-06 NO DATA 1.21E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Co-58 NO DATA 9.72E-07 2.24E-06 NO DATA NO DATA NO DATA 1.34E-05 ALL 0.0 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Fe-59 5.87E-06 1.37E-05 5.29E-06 NO DATA NO DATA 4.32E-06 3.24E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Co-60 NO DATA 2.81E-06 6.33E-06 NO DATA NO DATA NO DATA 3.66E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Zn-65 5.76E-06 2.00E-05 9.33E-06 NO DATA 1.28E-05 NO DATA 8.47E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Cs-134 8.37E-05 1.97E-04 9.14E-05 NO DATA 6.26E-05 2.39E-05 2.45E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Cs-137 1.12E-04 1.49E-04 5.19E-05 NO DATA 5.07E-05 1.97E-05 2.12E-06 ALL 0.0 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 H-3 NO DATA 1.06E-07 1.06E-07 1.06E-07 1.06E-07 1.06E-07 1.06E-07 063 3168 0.00E+00 5.37E-03 5.37E-03 5.37E-03 5.37E-03 5.37E-03 5.37E-03 Dose Commitment (mrem) = 0.00E+00 5.37E-03 5.37E-03 5.37E-03 5.37E-03 5.37E-03 5.37E-03 Section 4 - Page 11

Oconee Nuclear Station Dose from Shoreline Sediment Pathway for 2018 Data Maximum Exposed Teen Shoreline Recreation = 67 hr (in one year)

Shore Width Factor = 0.2 2

Sediment Surface Mass = 40 kg/m Teen Dose from Shoreline Sediment Pathway (mrem) = Shoreline Recreation (hr) x External Dose Factor (mrem/hr per pCi/m2) x Shore Width Factor x Sediment Surface Mass (kg/m2) x Sediment Concentration (pCi/kg)

External Dose Factor Standing Highest Annual Net Dose on Contaminated Ground Mean Concentration (mrem/hr per pCi/m2) Indicator Sediment (mrem)

Radionuclide T. Body Skin Location (pCi/kg) T. Body Skin Cs-134 1.20E-08 1.40E-08 ALL 0.00 0.00E+00 0.00E+00 Cs-137 4.20E-09 4.90E-09 091 168 3.78E-04 4.41E-04 Dose Commitment (mrem) = 3.78E-04 4.41E-04 Section 4 - Page 12

Oconee Nuclear Station Dose from Drinking Water Pathway for 2018 Data Maximum Exposed Adult Adult Dose from Drinking Water Pathway (mrem) = Usage (l) x Dose Factor (mrem/pCi ingested) x Concentration (pCi/l)

Usage (intake in one year) = 730 l Highest Annual Net Mean Ingestion Dose Factor Concentration Dose (mrem)

Indicator Water Radionuclide Bone Liver T. Body Thyroid Kidney Lung GI-LLI Location (pCi/l) Bone Liver T. Body Thyroid Kidney Lung GI-LLI Mn-54 NO DATA 4.57E-06 8.72E-07 NO DATA 1.36E-06 NO DATA 1.40E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Co-58 NO DATA 7.45E-07 1.67E-06 NO DATA NO DATA NO DATA 1.51E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Fe-59 4.34E-06 1.02E-05 3.91E-06 NO DATA NO DATA 2.85E-06 3.40E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Co-60 NO DATA 2.14E-06 4.72E-06 NO DATA NO DATA NO DATA 4.02E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Zn-65 4.84E-06 1.54E-05 6.96E-06 NO DATA 1.03E-05 NO DATA 9.70E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Nb-95 6.22E-09 3.46E-09 1.86E-09 NO DATA 3.42E-09 NO DATA 2.10E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Zr-95 3.04E-08 9.75E-09 6.60E-09 NO DATA 1.53E-08 NO DATA 3.09E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 I-131 4.16E-06 5.95E-06 3.41E-06 1.95E-03 1.02E-05 NO DATA 1.57E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Cs-134 6.22E-05 1.48E-04 1.21E-04 NO DATA 4.79E-05 1.59E-05 2.59E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Cs-137 7.97E-05 1.09E-04 7.14E-05 NO DATA 3.70E-05 1.23E-05 2.11E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 BaLa-140 2.03E-05 2.55E-08 1.33E-06 NO DATA 8.67E-09 1.46E-08 4.18E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 H-3 NO DATA 1.05E-07 1.05E-07 1.05E-07 1.05E-07 1.05E-07 1.05E-07 066 356 0.00E+00 2.73E-02 2.73E-02 2.73E-02 2.73E-02 2.73E-02 2.73E-02 Dose Commitment (mrem) = 0.00E+00 2.73E-02 2.73E-02 2.73E-02 2.73E-02 2.73E-02 2.73E-02 Section 4 - Page 13

Oconee Nuclear Station Dose from Fish Pathway for 2018 Data Maximum Exposed Adult Adult Dose from Fish Pathway (mrem) = Usage (kg) x Dose Factor (mrem/pCi ingested) x Concentration (pCi/kg)

H-3 Concentration in Fish = Surface Water pCi/l x Bioaccumulation Factor 0.9 pCi/kg per pCi/l = 3520 pCi/l x 0.9 = 3168 pCi/kg Usage (intake in one year) = 21 kg Highest Annual Net Mean Ingestion Dose Factor Concentration Dose (mrem)

Radionuclide Bone Liver T. Body Thyroid Kidney Lung GI-LLI Location (pCi/kg) Bone Liver T. Body Thyroid Kidney Lung GI-LLI Mn-54 NO DATA 4.57E-06 8.72E-07 NO DATA 1.36E-06 NO DATA 1.40E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Co-58 NO DATA 7.45E-07 1.67E-06 NO DATA NO DATA NO DATA 1.51E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Fe-59 4.34E-06 1.02E-05 3.91E-06 NO DATA NO DATA 2.85E-06 3.40E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Co-60 NO DATA 2.14E-06 4.72E-06 NO DATA NO DATA NO DATA 4.02E-05 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Zn-65 4.84E-06 1.54E-05 6.96E-06 NO DATA 1.03E-05 NO DATA 9.70E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Cs-134 6.22E-05 1.48E-04 1.21E-04 NO DATA 4.79E-05 1.59E-05 2.59E-06 ALL 0.00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Cs-137 7.97E-05 1.09E-04 7.14E-05 NO DATA 3.70E-05 1.23E-05 2.11E-06 ALL 0.0 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 H-3 NO DATA 1.05E-07 1.05E-07 1.05E-07 1.05E-07 1.05E-07 1.05E-07 063 3168 0.00E+00 6.99E-03 6.99E-03 6.99E-03 6.99E-03 6.99E-03 6.99E-03 Dose Commitment (mrem) = 0.00E+00 6.99E-03 6.99E-03 6.99E-03 6.99E-03 6.99E-03 6.99E-03 Section 4 - Page 14

Oconee Nuclear Station Dose from Shoreline Sediment Pathway for 2018 Data Maximum Exposed Adult Shoreline Recreation = 12 hr (in one year)

Shore Width Factor = 0.2 2

Sediment Surface Mass = 40 kg/m Adult Dose from Shoreline Sediment Pathway (mrem) = Shoreline Recreation (hr) x External Dose Factor (mrem/hr per pCi/m2) x Shore Width Factor x Sediment Surface Mass (kg/m2) x Sediment Concentration (pCi/kg)

External Dose Factor Standing Highest Annual Net Dose on Contaminated Ground Mean Concentration (mrem)

(mrem/hr per pCi/m2) Indicator Sediment Radionuclide T. Body Skin Location (pCi/kg) T. Body Skin Cs-134 1.20E-08 1.40E-08 ALL 0.00 0.00E+00 0.00E+00 Cs-137 4.20E-09 4.90E-09 091 168 6.77E-05 7.90E-05 Dose Commitment (mrem) = 6.77E-05 7.90E-05 Section 4 - Page 15

5.0 QUALITY ASSURANCE 5.1 SAMPLE COLLECTION EnRad Laboratories and the Environmental Service performed the environmental sample collections as specified by approved sample collection procedures.

5.2 SAMPLE ANALYSIS EnRad Laboratories performed the environmental sample analyses as specified by approved analysis procedures. EnRad Laboratories is located in Huntersville, North Carolina, at Duke Energys Environmental Center. During 2018, a vendor laboratory, General Engineering Laboratory, LLC (GEL), performed some environmental sample analyses as specified by approved analysis procedures.

5.3 DOSIMETRY ANALYSIS The Dosimetry and Records group performed the environmental dosimetry measurements as specified by approved dosimetry analysis procedures. The Dosimetry and Records Laboratory is located in Huntersville, North Carolina, at Duke Energys Environmental Center.

5.4 LABORATORY EQUIPMENT QUALITY ASSURANCE 5.4.1 DAILY QUALITY CONTROL EnRad Laboratories 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.

5.4.2 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.

5.4.3 BATCH PROCESSING Method quality control samples are analyzed with sample analyses that are processed in batches. These include tritium analyses in drinking water and surface water samples.

Section 5 - Page 1

5.5 DUKE ENERGY INTERLABORATORY COMPARISON PROGRAM In 2018 Duke Energy Environmental Laboratory (EnRad) participated in an interlaboratory program to satisfy Radiological Environmental Monitoring Program requirements in Duke Energy nuclear plant Offsite Dose Calculation Manuals and Selected Licensee Commitments Manuals, as applicable.

EnRad Laboratory participated in an interlaboratory program with Eckert & Ziegler Analytics (EZA) in 2018. EZA results were evaluated against the NRC Inspection Manual Procedure 84750 (IP 84750) acceptance criteria stated in EnRad Procedure 515, Cross Check Program Administration. All regulatory requirements continue to be met by the EZA Cross Check Program.

Low-level Iodine-131 analysis of drinking water was not required during 2018 since the dose calculated for the consumption of the water was not greater than 1 mrem per year and there were no abnormal releases exceeding 1 pCi/liter I-131 in 2018 in the ONS program.

This dose was calculated monthly during 2018 to ensure that low-level Iodine-131 analysis of drinking water samples was not required.

5.5.1 ECKERT & ZIEGLER ANALYTICS CROSS CHECK PROGRAM EZA mixed gamma in liquid, mixed gamma in soil, low-level I-131 in liquid, mixed gamma air filter composites, I-131 air cartridges, strontium in water, gross alpha and beta in water, gross alpha and beta in filters, and tritium in water were analyzed at various times of the year at EnRad Laboratories. A summary of the applicable REMP EnRad Laboratory program results for 2018 is documented in Table 5.0-A.

Interlaboratory cross check samples from EZA were received and analyzed in three of the four quarters of 2018. Table 5.0-A lists the performance for specific samples. Forty-six nuclide results were reported to EZA of which forty-six (100

%) met the acceptance criteria based on IP 84750.

5.6 SPLIT COMPARISON PROGRAM Oconee Nuclear Station routinely participates in an environmental sample intercomparison program. Program elements include sampling frequency and analysis for drinking water, surface water, milk, fish, broadleaf vegetation, and shoreline sediment samples that have been collected. Samples are routinely split with a vendor laboratory for intercomparison.

5.7 TLD INTERCOMPARISON PROGRAM 5.7.1 NUCLEAR TECHNOLOGY SERVICES INTERCOMPARISON PROGRAM Radiation Dosimetry and Records participates in a quarterly TLD intercomparison program administered by Nuclear Technology Services, Inc. of Roswell, GA.

Nuclear Technology Services irradiates environmental dosimeters quarterly and sends them to the Radiation Dosimetry and Records group for analysis of the Section 5 - Page 2

unknown estimated delivered exposure. A summary of the 2018 Nuclear Technology Services Intercomparison Report is documented in Table 5.0-B.

The individual measurements were evaluated and results falling outside the acceptable ratio criteria had an evaluation performed to identify any recommended remedial actions and to reduce anomalous errors.

5.7.2 INTERNAL CROSS CHECK (DUKE ENERGY)

Radiation Dosimetry and Records participates in a quarterly TLD internal comparison program administered internally by the Dosimetry Lab. The Dosimetry Lab Staff irradiates environmental dosimeters quarterly and submits them for analysis of the unknown estimated delivered exposure. A summary of the 2018 Internal Cross Check (Duke Energy) Program is documented in Table 5.0-B.

5.8 GENERAL ENGINEERING LABORATORY, LLC (GEL)

General Engineering Laboratory, LLC (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 2018. A summary of the GEL quality assurance program results for the sample media types sent to GEL during 2018 is documented in Table 5.0-C. Table 5.0-C may not be applicable to all plants or stations.

Section 5 - Page 3

TABLE 5.0-A ECKERT & ZIEGLER ANALYTICS CROSS CHECK PROGRAM 2018 Cross Check Results for EnRad Laboratories Interlaboratory cross check samples from EZA were received and analyzed in three of the four quarters of 2018. Results are reported directly to Eckert & Ziegler Analytics. Environmental cross check samples were analyzed in replicate, and the result closest to the mean is reported to Eckert & Ziegler Analytics. The acceptance criteria for the program was based on the NRC Inspection Manual Procedure 84750 (IP 84750). Table 5.0-A lists the performance for specific samples. Forty-six nuclide results were reported to EZA of which forty-six (100 %) met the acceptance criteria based on IP 84750.

EnRad EZA EnRad/EZA Sample Sample ID Nuclide Quarter Units Evaluation Value Value Ratio Beta Filter in E12096 Cs-137 1 pCi 212 207 1.02 Agreement Planchet E12180 Cs-137 2 pCi 202 210 0.96 Agreement I-131 in E12095 I-131 1 pCi 99.2 95.3 1.04 Agreement Charcoal Cartridge E12246 I-131 3 pCi 82.0 81.6 1.00 Agreement Gamma in E12094 Ce-141 1 pCi 83.8 82.0 1.02 Agreement Composite 1 Agreement Filter Co-58 pCi 124 121 1.02 Co-60 1 pCi Agreement 197 199 0.99 Cr-51 1 pCi Agreement 349 347 1.01 Cs-134 1 pCi Agreement 180 191 0.94 Cs-137 1 pCi Agreement 192 183 1.05 Fe-59 1 pCi Agreement 160 148 1.08 Mn-54 1 pCi Agreement 138 140 0.99 Zn-65 1 pCi 283 Agreement 260 1.09 Gamma in E12249 Ce-141 3 pCi/g 0.217 0.221 0.98 Agreement Simulated 3 Agreement Co-58 pCi/g 0.239 0.248 0.96 Soil Co-60 3 pCi/g 0.317 0.328 0.97 Agreement Cr-51 3 pCi/g 0.407 0.457 0.89 Agreement Cs-134 3 pCi/g 0.207 0.212 0.98 Agreement Cs-137 3 pCi/g 0.311 0.330 0.94 Agreement Fe-59 3 pCi/g 0.196 0.206 0.95 Agreement Mn-54 3 pCi/g 0.309 0.289 1.07 Agreement Zn-65 3 pCi/g 0.362 0.347 1.04 Agreement Section 5 - Page 4

TABLE 5.0-A (Cont.)

Sample EnRad EZA EnRad/EZA Sample Nuclide Quarter Units Evaluation ID Value Value Ratio Gamma in E12250 Ce-141 3 146 137 1.07 Agreement pCi/L Water 3 Agreement Co-58 pCi/L 164 153 1.07 Co-60 3 215 202 1.06 Agreement pCi/L Cr-51 3 307 282 1.09 Agreement pCi/L Cs-134 3 127 131 0.97 Agreement pCi/L Cs-137 3 169 157 1.07 Agreement pCi/L Fe-59 3 138 127 1.08 Agreement pCi/L I-131 3 64.7 62.5 1.04 Agreement pCi/L Mn-54 3 193 178 1.08 Agreement pCi/L Zn-65 3 240 214 1.12 Agreement pCi/L Gamma in E12097 Ce-141 1 pCi/L 79.4 77.0 1.03 Agreement Milk 1 Agreement Co-58 pCi/L 116 114 1.02 Co-60 1 pCi/L 192 187 1.03 Agreement Cr-51 1 Agreement pCi/L 335 326 1.03 Cs-134 1 Agreement pCi/L 174 180 0.97 Cs-137 1 Agreement pCi/L 183 172 1.06 Fe-59 1 Agreement pCi/L 151 139 1.09 Mn-54 1 Agreement pCi/L 141 131 1.07 Zn-65 1 Agreement pCi/L 266 244 1.09 LLI-131 in E12097 I-131 1 pCi/L 101 108 0.93 Agreement Milk Gross Beta E12178 Cs-137 2 pCi/L 224 226 0.99 Agreement in Water E12248 Cs-137 3 pCi/L 174 199 0.88 Agreement Tritium in E12179 H-3 2 pCi/L 11300 11000 1.02 Agreement Water E12247 H-3 3 pCi/L 13100 12900 1.02 Agreement Section 5 - Page 5

TABLE 5.0-B 2018 ENVIRONMENTAL DOSIMETER CROSS-CHECK RESULTS Nuclear Technology Services Radiation Dosimetry and Records participates in a quarterly TLD intercomparison program administered by Nuclear Technology Services, Inc. of Roswell, GA. Nuclear Techno1ogy Services irradiates environmental dosimeters quarterly and sends them to Radiation Dosimetry and Records group for analysis of the unknown estimated delivered exposure. The individual measurements were evaluated and results falling outside the acceptable ratio criteria had an evaluation performed to identify any recommended remedial actions and to reduce anomalous errors.

1st Quarter 2018 2nd Quarter 2018 TLD Reported Delivered Bias Pass/Fail TLD Reported Delivered Bias Pass/Fail Number (mR) (mR) (% diff) Criteria Pass/Fail Number (mR) (mR) (% diff) Criteria Pass/Fail 103109 84.34 76.32 10.51 <+/-15% Pass 100476 57.72 60.80 -5.07 <+/-15% Pass 103168 83.20 76.32 9.01 <+/-15% Pass 101207 59.63 60.80 -1.92 <+/-15% Pass 102842 79.60 76.32 4.30 <+/-15% Pass 100628 58.40 60.80 -3.95 <+/-15% Pass 102197 79.34 76.32 3.96 <+/-15% Pass 100232 54.45 60.80 -10.44 <+/-15% Pass 102240 79.98 76.32 4.80 <+/-15% Pass 103236 58.36 60.80 -4.01 <+/-15% Pass Average Bias (B) 6.51 Average Bias (B) -5.08 Standard Deviation (S) 3.03 Standard Deviation (S) 3.21 Measure Performance lBl+S 9.54 <15% Pass Measure Performance lBl+S 8.29 <15% Pass 3rd Quarter 2018 4th Quarter 2018 TLD Reported Delivered Bias Pass/Fail TLD Reported Delivered Bias Pass/Fail Number (mR) (mR) (% diff) Criteria Pass/Fail Number (mR) (mR) (% diff) Criteria Pass/Fail 102475 18.69 18.84 -0.80 <+/-15% Pass 103532 67.52 61.93 9.03 <+/-15% Pass 100674 18.66 18.84 -0.96 <+/-15% Pass 102805 67.74 61.93 9.38 <+/-15% Pass 100287 17.66 18.84 -6.96 <+/-15% Pass 103209 66.84 61.93 7.93 <+/-15% Pass 101172 18.23 18.84 -3.24 <+/-15% Pass 103347 69.03 61.93 11.46 <+/-15% Pass 101202 18.48 18.84 -1.91 <+/-15% Pass 103399 67.21 61.93 8.53 <+/-15% Pass Average Bias (B) -2.63 Average Bias (B) 9.27 Standard Deviation (S) 2.25 Standard Deviation (S) 1.35 Measure Performance lBl+S 4.88 <15% Pass Measure Performance lBl+S 10.61 <15% Pass Section 5 - Page 6

TABLE 5.0-B (Cont.)

2018 ENVIRONMENTAL DOSIMETER CROSS CHECK RESULTS Internal Crosscheck (Duke Energy)

Radiation Dosimetry and Records participates in a quarterly TLD internal comparison program administered internally by the Dosimetry Lab. The Dosimetry Lab Staff irradiates environmental dosimetry quarterly and submits them for analysis of the unknown estimated delivered exposure.

1st Quarter 2018 2nd Quarter 2018 TLD Reported Delivered Bias Pass/Fail TLD Reported Delivered Bias Pass/Fail Number (mR) (mR) (% diff) Criteria Pass/Fail Number (mR) (mR) (% diff) Criteria Pass/Fail 103932 34.28 37.26 -7.99 <+/-15% Pass 103049 20.41 18.49 10.38 <+/-15% Pass 103952 34.50 37.26 -7.40 <+/-15% Pass 103360 21.06 18.49 13.90 <+/-15% Pass 104007 34.95 37.26 -6.19 <+/-15% Pass 100021 18.06 18.49 -2.33 <+/-15% Pass 103961 35.30 37.26 -5.26 <+/-15% Pass 102504 20.03 18.49 8.33 <+/-15% Pass 103962 35.10 37.26 -5.79 <+/-15% Pass 102466 19.51 18.49 5.52 <+/-15% Pass 103931 35.54 37.26 -4.61 <+/-15% Pass 100208 17.93 18.49 -3.03 <+/-15% Pass 104011 35.22 37.26 -5.47 <+/-15% Pass 101155 18.66 18.49 0.92 <+/-15% Pass 103950 35.48 37.26 -4.77 <+/-15% Pass 101145 17.93 18.49 -3.03 <+/-15% Pass 103949 35.37 37.26 -5.07 <+/-15% Pass 101272 18.00 18.49 -2.65 <+/-15% Pass 103951 35.75 37.26 -4.05 <+/-15% Pass 100515 17.87 18.49 -3.35 <+/-15% Pass Average Bias (B) -5.66 Average Bias (B) 2.47 Standard Deviation (S) 1.24 Standard Deviation (S) 6.52 Measure Performance lBl+S 6.90 <15% Pass Measure Performance lBl+S 8.99 <15% Pass 3rd Quarter 2018 4th Quarter 2018 TLD Reported Delivered Bias Pass/Fail TLD Reported Delivered Bias Pass/Fail Number (mR) (mR) (% diff) Criteria Pass/Fail Number (mR) (mR) (% diff) Criteria Pass/Fail 102886 44.09 40.0 10.23 <+/-15% Pass 102089 46.94 45.0 4.31 <+/-15% Pass 102730 44.27 40.0 10.68 <+/-15% Pass 102442 45.03 45.0 0.07 <+/-15% Pass 102248 41.02 40.0 2.55 <+/-15% Pass 102336 47.40 45.0 5.33 <+/-15% Pass 102867 42.58 40.0 6.45 <+/-15% Pass 103721 48.89 45.0 8.64 <+/-15% Pass 102464 40.91 40.0 2.27 <+/-15% Pass 102738 48.54 45.0 7.87 <+/-15% Pass 102752 43.09 40.0 7.73 <+/-15% Pass 103194 47.94 45.0 6.53 <+/-15% Pass 102803 43.80 40.0 9.50 <+/-15% Pass 102931 47.59 45.0 5.76 <+/-15% Pass 103531 43.17 40.0 7.93 <+/-15% Pass 103742 49.22 45.0 9.38 <+/-15% Pass 102880 44.04 40.0 10.10 <+/-15% Pass 102029 47.14 45.0 4.76 <+/-15% Pass 102415 42.26 40.0 5.65 <+/-15% Pass 102290 46.10 45.0 2.44 <+/-15% Pass Average Bias (B) 7.31 Average Bias (B) 5.51 Standard Deviation (S) 3.06 Standard Deviation (S) 2.84 Measure Performance lBl+S 10.37 <15% Pass Measure Performance lBl+S 8.35 <15% Pass Section 5 - Page 7

TABLE 5.0-C 2018 GEL Laboratories, LLC QA Results Interlaboratory cross check samples from Eckert & Ziegler Analytics (EZA) and Proficiency Tests from the Department of Energy Mixed Analyte Performance Evaluation Program (MAPEP) were received and analyzed by GEL in all four quarters of 2018 from EZA and in two quarters from MAPEP. Table 5.0-C lists the performance for specific samples.

Table 5.0-C may not be applicable to all plants/stations GEL Known Acceptance Sample Sample Nuclide Quarter Units Evaluation Value Value Range/Ratio ID Hard To Detect in MAPEP Fe-55 2 Bq/kg 67 N/A False Pos Test Agreement Soil Ni-63 2 Bq/kg 1.05 N/A False Pos Test Agreement MaS38 Sr-90 2 Bq/kg -1.08 N/A False Pos Test Agreement MAPEP Fe-55 4 Bq/kg 434 512 358 - 666 Agreement Ni-63 4 Bq/kg 793 765 536 - 995 Agreement MaS39 Sr-90 4 Bq/kg 162 193 135 - 251 Agreement I-131 in Milk with E12173 I-131 1 pCi/L 105 108 0.97 Agreement EZA E12173 I-131 2 pCi/L 78.9 71.9 1.10 Agreement E12242 I-131 3 pCi/L 71.8 58.2 1.23 Agreement E12348 I-131 4 pCi/L 95.8 93.3 1.03 Agreement Gross Beta in Water E12304(1) Cs-137 4 pCi/L 241 295 0.82 Agreement (1)

One set of December 2018 Gross Beta in water analyses were analyzed at GEL.

Section 5 - Page 8

APPENDIX A ENVIRONMENTAL SAMPLING ANALYSIS PROCEDURES Appendix A - Page 1

APPENDIX A ENVIRONMENTAL SAMPLING AND ANALYSIS PROCEDURES Adherence to established procedures for sampling and analysis of all environmental media at Oconee Nuclear Station is required to ensure compliance with Station Selected Licensee Commitments. Analytical procedures were employed to ensure that Selected Licensee Commitments detection capabilities were achieved.

Environmental sampling and analyses were performed by EnRad Laboratories, Dosimetry and Records, Environmental Services, and General Engineering Laboratories, LLC.

This appendix describes the environmental sampling frequencies and analysis procedures by media type.

I. CHANGE OF SAMPLING PROCEDURES Location 047 TLD (New Hope Church, Hwy. 188 (3.58 mi. WSW)) was replaced with location 092 TLD (Hilton Circle, Hwy. 188 (3.62 mi. WSW)) due to location 047 being obstructed by bushes and located on private property (NCR # 02226974).

II. DESCRIPTION OF ANALYSIS PROCEDURES Gamma spectroscopy analyses are performed using high purity germanium gamma detectors and Canberra analytical software. Designated sample volumes are transferred to appropriate counting geometries and analyzed by gamma spectroscopy.

Perishable samples such as fish and broadleaf vegetation are ground to achieve a homogeneous mixture. Soils and sediments are dried, sifted to remove foreign objects (rocks, clams, glass, etc.) then transferred to appropriate counting geometry.

Low-level iodine analyses are performed by passing a designated sample aliquot through a pre-weighed amount of ion exchange resin to remove and concentrate any iodine in the aqueous sample (milk). The resin is then dried, mixed thoroughly, and a net resin weight determined before being transferred to appropriate counting geometry and analyzed by gamma spectroscopy.

Tritium analyses are performed by using low-level environmental liquid scintillation analysis technique on a Perkin-Elmer 4910TR liquid scintillation system or a Perkin-Elmer 3100TR liquid scintillation system. Tritium samples are distilled and batch processed with a laboratory fortified blank, matrix spike, matrix spike duplicate, and blank to verify instrument performance and sample preparation technique are acceptable.

Appendix A - Page 2

Gross beta analysis is performed by concentrating a designated aliquot of sample precipitate and analyzing by Tennelec XLB Series 5 gas-flow proportional counters.

Samples are batch processed with a blank to ensure sample contamination has not occurred.

III. CHANGE OF ANALYSIS PROCEDURES No analysis procedures were changed in 2018.

IV. SAMPLING AND ANALYSIS PROCEDURES A.1 AIRBORNE PARTICULATE AND RADIOIODINE Airborne particulate and radioiodine samples at each of six locations were composited continuously by means of continuous air samplers. Air particulates were collected on a particulate filter and radioiodines were collected in a charcoal cartridge positioned behind the filter in the sampler. The samplers are designed to operate at a constant flow rate (in order to compensate for any filter loading) and are set to sample approximately 2 cubic feet per minute. Filters and cartridges were collected weekly. A separate weekly gamma analysis was performed on each charcoal cartridge. A weekly gross beta analysis was performed on each filter. A quarterly gamma analysis was performed on the quarterly filter composite (by location). The continuous composite samples were collected from the locations listed below.

Location 077 = Skimmer Wall (1.00 mi. SW)

Location 078.1 = Recreation Site (0.53 mi. WSW)

Location 079 = Keowee Dam (0.56 mi. NE)

Location 081 = Clemson Operations Center (9.33 mi. SE)(Control)

Location 084 = Sue Craig Road (2.58 mi. NNE)

Location 085 = Lake Services / Building B9125 (0.88 mi. NNW)

A.2 DRINKING WATER Monthly composite samplers were operated to collect an aliquot at least every two hours. Gross beta and gamma analysis was performed on the monthly composites. Tritium analysis was performed on the quarterly composites. The composites were collected monthly from the locations listed below.

Location 060 = Greenville Water Intake Rd. (3.23 mi. NE)

Location 064 = Seneca (6.67 mi. SSW)(Control)

Location 066 = Anderson (18.9 mi SSE)

Appendix A - Page 3

A.3 SURFACE WATER Monthly composite samplers were operated to collect an aliquot at least every two hours. Gamma analysis was performed on the monthly composites. Tritium analysis was performed on the quarterly composites sample. The composites were collected monthly from the locations listed below.

Location 062 = Lake Keowee Hydro Intake (0.85 mi. ENE)(Control)

Location 063.1 = Lake Hartwell Hwy 183 Bridge (0.79 mi. E)

A.4 MILK Biweekly grab samples were collected at one location although the Oconee ODCM requires semimonthly samples. Biweekly grab samples are taken to meet the required sample frequency for scheduling purposes. A gamma and low-level Iodine-131 analysis was performed on each sample. The biweekly grab samples were collected from the location listed below.

Location 071 = Clemson Dairy (10.2 mi. SSE)(Control)

A.5 BROADLEAF VEGETATION Monthly samples were collected and a gamma analysis was performed on each sample. The samples were collected from the locations listed below.

Location 077 = Skimmer Wall (1.00 mi. SW)

Location 079 = Keowee Dam (0.56 mi. NE)

Location 081 = Clemson Operations Center (9.33 mi. SE)(Control)

Location 084 = Sue Craig Road (2.58 mi. NNE)

A.6 FISH Semiannual samples were collected and a gamma analysis was performed on the edible portions of each sample. The samples were collected from the locations listed below.

Location 060 = Greenville Water Intake Rd. (2.28 mi. NE)(Control)

Location 063 = Lake Hartwell Hwy 183 Bridge (0.80 mi. ESE)

Location 067 = Lawrence Ramsey Bridge Hwy 27 (4.34 mi. SSE)

A.7 SHORELINE SEDIMENT Semiannual samples were collected and a gamma analysis was performed on each sample following the drying and removal of rocks and clams. The samples were collected from the locations listed below.

Location 067 = Lawrence Ramsey Bridge Hwy 27 (4.34 mi. SSE)

Location 068 = High Falls County Park (1.82 mi. W)(Control)

Appendix A - Page 4

Location 091 = Holders Landing Road (2.09 mi. S)

A.8 DIRECT GAMMA RADIATION (TLD)

Thermoluminescent dosimeters (TLD) were collected quarterly at fifty locations.

A gamma exposure rate was determined for each TLD. The TLDs were placed as indicated below.

An inner ring of 25 TLDs, one in each meteorological sector in the general area of the site boundary.

An outer ring of 16 TLDs, one in each meteorological sector in the 6 to 8 kilometer range.

The remaining TLDs were placed in special interest areas such as population centers, residential areas, schools, and control locations.

TLD Locations are listed in Table 2.1-B.

A.9 ANNUAL LAND USE CENSUS An annual Land Use Census was conducted to identify within a distance of 8 kilometers (5.0 miles) from the station, the following locations in each of the sixteen meteorological sectors:

The Nearest Residence

The Nearest Milk-giving Animal (cow, goat, etc.) where milk is used for human consumption The census was conducted during the growing season 5/22 - 5/23/2018. Results are shown in Table 3.9. No changes were made to the sampling procedures during 2018 as a result of the 2018 census.

V. GLOBAL POSITIONING SYSTEM (GPS) ANALYSIS The Oconee site centerline used for GPS measurements was referenced from the Oconee Nuclear Station Updated Final Safety Analysis Report (UFSAR), section 2.1.1.1, Specification of Location. Waypoint coordinates used for ONS GPS measurements were latitude 34°-47'-38.2"N and longitude 82°-53'-55.4"W. Maps and tables were generated using North American Datum (NAD) 27. Data normally reflect accuracy to within 2 to 5 meters from point of measurement. GPS field measurements were taken as close as possible to the item of interest. Distances for the locations are displayed using three significant figures.

Appendix A - Page 5

APPENDIX B RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

OF RESULTS 2018 Appendix B - Page 1

OCONEE NUCLEAR STATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM DATA

SUMMARY

Oconee Nuclear Station Docket Numbers 50-269, 270, 287 Oconee County, South Carolina Calendar Year 2018 Location w/Highest Annual Mean Type and All Indicator No. of Medium or Pathway Total No. of Lower Limit Locations(2) (3) Control Locations Non-Routine Sampled or Measured Measurements of Detection Mean Name, Distance, Mean Mean Report (Unit of Measurement) Performed (LLD)(1) Range and Direction Range(2) (3) Range(2) (3) Meas.

081 (9.33 mi SE)

Air Particulate Gross Beta 2.09E-02 (260/260) 2.30E-02 (52/52) 2.01E-02 (52/52) 0 See Table 2.2-C 077 (pCi/m3) 312(4) 5.02E 4.18E-02 (1.00 mi SW) 1.04E 4.18E-02 7.13E 3.67E-02 0

Gamma See Table 2.2-C All less than LLD ----- ----- All less than LLD 25(4)

Air Radioiodine Gamma 0 See Table 2.2-C All less than LLD ----- ----- All less than LLD (pCi/m3) 312(4) 064 (6.67 mi SSW)

Drinking Water Gross Beta 4 1.49E+00 (17/26) 060 1.50E+00 (6/13) 1.27E+00 (8/13) 0 (pCi/l) 39(4) 6.92E 2.58E+00 (3.23 mi NE) 1.02E+00 - 2.58E+00 6.83E 2.32E+00 Gamma See Table 2.2-C All less than LLD ----- ----- All less than LLD 0 39(4) 0 Tritium 3.56E+02 (4/8) 066 3.56E+02 (4/4) All less than LLD 2000 12(4) 2.47E+02 - 4.57E+02 (18.9 mi SSE) 2.47E+02 - 4.57E+02 Gamma See Table 2.2-C All less than LLD ----- All less than LLD 0 Surface Water -----

(pCi/l) 26(4)

Tritium 2000 3.52E+03 (4/4) 063.1 3.52E+03 (4/4) All less than LLD 0 8(4) 1.29E+03 - 5.61E+03 (0.79 mi E) 1.29E+03 - 5.61E+03 Milk Gamma See Table 2.2-C No Indicator Location 0 (pCi/l) ----- ----- All less than LLD 26 I-131 See Table 2.2-C No Indicator Location ----- ----- All less than LLD 0 26 Appendix B - Page 2

OCONEE NUCLEAR STATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM DATA

SUMMARY

Oconee Nuclear Station Docket Numbers 50-269, 270, 287 Oconee County, South Carolina Calendar Year 2018 Location w/Highest Annual Mean Medium or Pathway Type and Lower Limit All Indicator Control Locations No. of Sampled or Measured Total No. of of Detection Locations(2) (3) Name, Distance, Mean Mean Non-Routine (Unit of Measurement) Measurements (LLD)(1) Mean and Direction Range(2) (3) Range(2) (3) Report Performed Range Meas.

Broadleaf Vegetation Gamma See Table 2.2-C All less than LLD ----- ----- All less than LLD 0 (pCi/kg, wet) 48 Gamma See Table 2.2-C All less than LLD ----- All less than LLD 0 Fish -----

(pCi/kg, wet) 12 Sediments--Shoreline 0 Gamma See Table 2.2-C (pCi/kg, dry) All less than LLD 6 1.49E+02 (3/4) 091 1.68E+02 (2/2)

Cs-137 180 1.93E+01 - 3.16E+02 (2.09 mi S) 1.93E+01 - 3.16E+02 058 (9.39 mi WSW)

TLD 0 081 (9.33 mi SE)

(mR per quarter) (5) TLD Readout 2.19E+01 (192/192) 024 3.00E+01 (4/4)

2.81E+01 (8/8) 200 1.45E+01 - 3.26E+01 (0.81 mi E) 2.79E+01 - 3.26E+01 2.26E+01 - 3.42E+01 Appendix B - Page 3

Footnotes to Appendix B

1. The Lower Limit of Detection (LLD) is the smallest concentration of radioactive material in a sample that will yield a net count above system background which will be detected with 95 percent probability and with only 5 percent probability of falsely concluding that a blank observation represents a "real" signal. Due to counting statistics and varying volumes, occasionally lower LLDs are achieved. Refer to Section 2.3.2 for an explanation of how LLD values were derived.

2. Mean and range are based on detectable measurements only.

3. The fractions of all samples with detectable activities at specific locations are indicated in parentheses.

4. Missing samples or surveillances are discussed in Appendix C or Appendix D.

5. TLD exposure is reported in milliroentgen (mR) per standard quarter (91 days). TLD data indicated in section 3.8 (Direct Gamma Radiation) are reported in mrem /yr (n

0.95 ergs/g-Roentgen) 2.

2 Cember, H. (2009). Introduction to Health Physics, 4th Edition. United States: McGraw-Hill Companies, Inc.

Appendix B - Page 4

APPENDIX C SAMPLING DEVIATIONS UNAVAILABLE ANALYSES Appendix C - Page 1

APPENDIX C OCONEE NUCLEAR STATION SAMPLING DEVIATIONS & UNAVAILABLE ANALYSES DEVIATION & UNAVAILABLE REASON CODES BF Blown Fuse PM Preventive Maintenance CN Construction PO Power Outage FZ Sample Frozen PS Pump out of service / Undergoing repair IV Insufficient Volume SL Sample Loss/Lost due to Lab Accident IW Inclement Weather SM Motor / Rotor Seized LC Line Clog to Sampler SU Seasonally Unavailable OT Other TF Torn Filter PI Power Interrupt VN Vandalism C.1 SAMPLING DEVIATIONS Air Particulate and Air Radioiodine REMP weekly air samples (Air Particulate (AP) or Air Radioiodine (AR)) that experience any downtime during a surveillance period are reported as a Deviation and classified as a Sampling Deviation. However, the sample is counted and the data reported, whereas a Deviation with no available sample is classified as an Unavailable Analyses and does not have any data reported. The air samplers operated for a total of 99.46% availability in 2018.

Scheduled Description & Corrective Location Collection Dates Code Action to Prevent Recurrence Action 081 1/2 - 1/8/2018 PI 0.36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months downtime, undetermined cause. NCR # 02176077 Air sampler exceeded calibration due date and incorrect filter placed into field. Implemented procedural review of REMP Instrument Report and removed old filters NCR # 02179565 085 1/22-1/29/2018 OT from REMP supplies to prevent these recurrences. NCR # 02180971 33.85 hours9.837963e-4 days 0.0236 hours 1.405423e-4 weeks 3.23425e-5 months downtime due to severe thunderstorm/high 078.1 4/30-5/7-2018 PI winds. Underground power leg burned up. NCR # 02204607 077 5/7-5/14/2018 PI 2.93 hours0.00108 days 0.0258 hours 1.537698e-4 weeks 3.53865e-5 months downtime due to severe thunderstorm. NCR # 02206651 078.1 5/7-5/14/2018 PI 4.25 hours2.893519e-4 days 0.00694 hours 4.133598e-5 weeks 9.5125e-6 months downtime due to severe thunderstorm. NCR # 02206652 6.24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months downtime due to crew working on 078.1 6/11-6/18/2018 PI underground line repair. NCR # 02214268 18.06 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months downtime due to severe thunderstorm 079 6/11-6/18/2018 PI tripping breaker. NCR # 02214269 084 12/3-12/10/2018 PI 3.92 hours0.00106 days 0.0256 hours 1.521164e-4 weeks 3.5006e-5 months downtime due to unknown reason NCR # 02248327 8.63 hours7.291667e-4 days 0.0175 hours 1.041667e-4 weeks 2.39715e-5 months downtime due to air sampler motor seizing 085 12/10-12/18/2018 SM up. NCR # 02249840 Drinking Water and Surface Water REMP monthly drinking water samples (Drinking Water (DW)) or surface water samples (Surface Water (SW))

that experience any downtime during a surveillance period are reported as a Deviation and classified as a Sampling Deviation. However, the sample is counted and the data reported, whereas a Deviation with no available sample is classified as an Unavailable Analyses and does not have any data reported. The drinking and surface water samplers operated for a total of 100% availability in 2018. There were no deviations for drinking water or surface water samples in 2018.

Appendix C - Page 2

C.2 UNAVAILABLE ANALYSES Air Particulate and Air Radioiodine Scheduled Description & Corrective Location Collection Dates Code Action to Prevent Recurrence Action 163.18 hours2.083333e-4 days 0.005 hours 2.97619e-5 weeks 6.849e-6 months downtime due to severe thunderstorm/high 078.1 4/23-4/30/2018 PI winds. Underground power leg burned up. NCR # 02202968 Appendix C - Page 3

APPENDIX D ANALYTICAL DEVIATIONS No Analytical deviations were incurred for the 2018 Radiological Environmental Monitoring Program Appendix D - Page 1

APPENDIX E RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM RESULTS 2018 This appendix includes sample analysis report summaries and supportive data generated from each sample medium for 2018 Appendix E - Page 1

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR PARTICULATE Concentration (Activity): pCi/m3 Sample Point 077 [ INDICATOR - SW @ 1 miles]

Sample ID: 465646 Sample Dates: 1/2/2018 -1/8/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.48E-02 4.13E-03 3.86E-03 Sample ID: 466007 Sample Dates: 1/8/2018 - 1/15/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.57E-02 2.95E-03 3.54E-03 Sample ID: 466209 Sample Dates: 1/15/2018 -1/22/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.74E-02 3.37E-03 3.18E-03 Sample ID: 466394 Sample Dates: 1/22/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.46E-02 2.72E-03 3.15E-03 Sample ID: 466992 Sample Dates : 1/29/2018 - 2/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.95E-02 3.00E-03 3.09E-03 Sample ID: 467344 Sample Dates : 2/5/2018 - 2/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.85E-02 2.86E-03 3.00E-03 Sample ID: 467668 Sample Dates: 2/12/2018 - 2/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.31 E-02 2.39E-03 2.77E-03 Sample ID: 468442 Sample Dates: 2/19/2018 - 2/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.32E-02 2.77E-03 3.42E-03 Sample ID: 468770 Sample Dates: 2/26/2018 - 3/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.34E-02 3.26E-03 3.31E-03 Sample ID: 469578 Sample Dates: 3/5/2018 - 3/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.70E-02 3.0SE-03 2.92E-03 Sample ID: 470613 Sample Dates: 3/12/2018 - 3/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.36E-02 3.27E-03 3.35E-03 Sample ID: 471164 Sample Dates: 3/19/2018 - 3/26/2018 Nuclide Activity

2 Sigma Error MDA Beta 1.91E-02 3.03E-0 3 3.31E-03 Sample ID: 471725 Sample Dates : 3/26/2018 -4/2/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.51E-02 2.54E-03 2.90E-03 Sample ID: 472522 Sample Dates: 1/2/2018 -4/2/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.44E-03 0.00E+OO 1.44E-03 Cs-137 <1.44E-03 O.OOE+OO 1.44E-03 Be-7 1.31E-01 3.73E-02 3.85E-02 K-40 1.20E-02 1.21E-02 1.BOE-02 Sample ID: 472516 Sample Dates: 4/2/2018 - 4/9/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.76E-02 3.06E-0 3 2. 86E-03 Sample ID: 472991 Sample Dates: 4/9/2018 -4/16/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.41E-02 2.90E-03 2.72E-03 Sample ID: 473272 Sample Dates : 4/16/2018 -4/23/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.29E-02 2.84E-03 2.80E-03 Sample ID: 473644 Sample Dates: 4/23/2018 - 4/30/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.47E-02 2.81 E-03 3.30E-03 Sample ID: 474160 Sample Dates: 4/30/2018 - 517/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.28E-02 3.68E-03 3.48E-03 Sample ID: 474538 Sample Dates: 517/2018 - 5/14/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.73E-02 3.86E-03 3.38E-03 Sample ID: 474905 Sample Dates: 5/14/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.16E-02 3.04E-03 3.0SE-03 Sample ID: 475225 Sample Dates: 5/21/2018 - 5/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.32E-02 2.18E-03 2.41E-03 Sample ID: 475546 Sample Dates: 5/29/2018 -6/4/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.59E-02 2.86E-0 3 3.37E-03 Sample ID: 476371 Sample Dates: 6/4/2018 - 6/11/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.69E-02 3.86E-03 3.49E-03 Report Generated@ 5/1/2019 11 :57:36 Duke Energy Annual Report -Appendix E

([~_) -- EnRad Laboratories 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 2 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR PARTICULATE Concentration (Activity): pCi/m3 Sample Point 077 [ INDICATOR - SW @ 1 miles ]

Sample ID: 477391 Sample Dates: 6/11/2018 - 6/18/2018 Nuclide Activity 2 Sigma Error MOA Beta 2.95E-02 3.06E-03 2.62E-03 Sample ID: 478117 Sample Dates: 6/18/2018 - 6/25/2018 Nuclide Activity 2 Sigma Error MOA Beta 2.26E-02 3.38E-03 3.73E-03 Sample ID: 478433 Sample Dates: 6/25/2018. 7/2/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.70E-02 2.91E-03 3.34E-03 Sample ID: 478806 Sample Dates: 4/2/2018

7/2/2018 Nuclide Activity 2 Sigma Error MOA Cs-134 <9.72E-04 O.OOE+OO 9.72E-04 Cs-137 <1.53E-03 O.OOE+OO 1.53E-03 Be-7 2.19E-01 4.37E-02 3.01 E-02 K-40 <2.29E-02 O.OOE+OO 2.29E-02 Sample ID: 478800 Sample Oates : 7/2/2018

7/9/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.08E-02 2.69E-03 2.58E-03 Sample ID: 479212 Sample Dates : 7/9/2018

7/16/2018 Nuclide Activity 2 Sigma Error MOA Beta 3.21E-02 3.71E-03 3.?0E-03 Sample ID: 479893 Sample Dates: 7/16/2018 - 7/23/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.66E-02 3.43E-03 3.47E-03 Sample ID: 480256 Sample Dates: 7/23/2018 - 7/30/2018 Nuclide Activity 2 Sigma Error MOA Beta 3.09E-02 3.59E-03 3.32E-03 Sample ID: 481083 Sample Dates: 7/30/2018. 8/6/2018 Nuclide Activity 2 Sigma Error MOA Beta 1.45E-02 2.53E-03 2.98E-03 Sample ID: 481524 Sample Dates: 8/6/2018. 8/13/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.06E-02 3.07E-03 3.27E-03 sa*mple ID: 481974 Sample Dates: 8/13/2018

8/20/2018 Nuclide Activity 2 Sigma Error MOA Beta 2.92E-02 3.57E-03 3.44E-03 Sample ID: 482492 Sample Dates: 8/20/2018. 8/27/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.70E-02 3.47E-03 3.57E-03 Sample ID: 482817 Sample Oates: 8/27/2018

9/4/2018 Nuclide Activity 2 Sigma Error MOA Beta 2.70E-02 3.02E-03 2.GOE-03 Sample ID: 483439 Sample Dates: 9/4/2018. 9/10/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.10E-02 3.10E-03 3.39E-03 Sample ID: 484036 Sample Dates: 9/10/2018

9/17/2018 Nuclide Activity 2 Sigma Error MOA Beta 1.04E-02 2.34E-03 3.03E-03 Sample ID: 484611 Sample Dates: 9/17/2018. 9/24/2018 Nuclide Activity 2 Sigma Error MOA Beta 3.14E-02 3.60E-03 3.28E-03 Sample ID: 485036 Sample Dates: 9/24/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MOA Beta 1.87E-02 2.98E-03 3.25E-03 Sample ID: 485499 Sample Dates: 7/2/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.25E-03 O.OOE+OO 1.25E-03 Cs-137 <1 .03E-03 O.OOE+OO 1.03E-03 Be-7 1.51E-01 3.41E-02 1.90E-02 K-40 <2.66E-02 O.OOE+OO 2.66E-02 Sample ID: 485493 Sample Dates: 10/1/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA Beta 4.18E-02 3.93E-03 3.07E-03 Sample ID: 486176 Sample Dates: 10/8/2018 -10/15/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.09E-02 3.06E-03 3.14E-03 Sample ID: 486708 Sample Dates : 10/15/2018

10/22/2018 Nuclide Activity 2 Sigma Error MOA Beta 2.83E-02 3.SOE-03 3.42E-03 Sample ID: 487747 Sample Dates : 10/22/2018 - 10/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.18E-02 3.21E-03 3.47E-03 Sample ID: 487991 Sample Dates: 10/29/2018 -11/5/2018 Nuclide Activity 2 Sigma Error MOA Beta 2.17E-02 2.80E-03 2.82E-03 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 3 of 91 Duke Energy Annual Report - Appendix E (E !~ 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR PARTICULATE Concentration (Activity): pCi/m3 Sample Point 077 [ INDICATOR - SW @ 1 miles J Sample ID: 488483 Sample Dates : 11/5/2018 - 11/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.04E-02 2.78E-03 2.84E-03 Sample ID: 488862 Sample Dates: 11/12/2018 -11/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.34E-02 3.21E-03 3.21E-03 Sample ID: 489159 Sample Dates: 11/19/2018 -11/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.82E-02 3.09E-03 2.82E-03 Sample ID: 489741 Sample Dates: 11/26/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.45E-02 2.95E-03 2.92E-03 Sample ID: 490164 Sample Dates: 12/3/2018 - 12/10/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.66E-02 2.98E-03 3.49E-03 Sample ID: 490811 Sample Dates : 12/10/2018 -12/18/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.82E-02 2.43E-03 2.49E-03 Sample ID: 491186 Sample Dates: 12/18/2018 -12/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.90E-02 2.75E-03 2.82E-03 Sample ID: 491487 Sample Dates: 12/26/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.89E-02 3.42E-03 4.0BE-03 Sample ID: 491772 Sample Dates: 10/1/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <2.27E-03 O.OOE+OO 2.27E-03 Cs-137 <1.SBE-03 O.OOE+OO 1.SBE-03 Be-7 1.41E-01 3.65E-02 3.44E-02 K-40 <2.84E-02 O.OOE+OO 2.84E-02 Sample Point 078.1 [ INDICATOR -WSW@0.53 miles]

Sample ID: 465647 Sample Dates : 1/2/2018 -1/8/2018 Nuclide Activity 2 Sigma Error MD~

Beta 3.0GE-02 3.95E-03 3. 86E-03 Sample ID: 466008 Sample Dates : 1/8/2018 -1/15/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.90E-02 3.11E-03 3. 54E-03 Sample JD: 466210 Sample Dates: 1/15/2018 -1/22/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.45E-02 3.24E-03 3.18E-03 Sample ID: 466395 Sample Dates: 1/22/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.66E-02 2.82E-03 3.15E-03 Sample ID: 466993 Sample Dates: 1/29/2018 -2/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.63E-02 2.82E-03 3.0BE-03 Sample ID: 467345 Sample Dates : 2/5/2018 - 2/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.96E-02 2.92E-03 3.01E-03 Sample JD: 467669 Sample Dates: 2/12/2018 - 2/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.51E-02 2.49E-03 2.77E-03 Sample ID: 468443 Sample Dates : 2/19/2018 -2/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.39E-02 2.81 E-03 3.42E-03 Sample JD: 468771 Sample Dates : 2/26/2018 - 3/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 2. 15E-02 3.17E-03 3.31 E-03 Sample ID: 469579 Sample Dates: 3/5/2018 - 3/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.28E-02 2.88E-03 2.92E-03 Sample JD: 470614 Sample Dates : 3/12/2018 - 3/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.SOE-02 3.34E-03 3.35E-03 Sample ID: 471165 Sample Dates: 3/19/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.82E-02 2.99E-03 3.3 1E-03 Sample ID: 471726 Sample Dates: 3/26/2018 -4/2/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.43E-02 2.49E-03 2.89E-03 Sample ID: 472523 Sample Dates: 1/2/2018 - 4/2/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.SOE-03 O.OOE+OO 1.SOE-03 Cs-137 < 1.36E-03 O.OOE+OO 1.36E-03

~--

Be-7 1.54E-01 4.01E-02 3.83E-02 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 4 of 91 Duke Energy Annual Report - Appendix E <En _) 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR PARTICULATE Concentration (Activity): pCi/m3 Sample Point 078.1 [INDICATOR-WSW@ 0.53 miles]

Sample ID: 472523 Sample Dates: 1/2/2018 -4/2/2018 Nuclide Activity 2 Sigma Error MDA K-40 <3.13E-02 0.00E+OO 3.13E-02 Sample ID: 472517 Sample Dates: 4/2/2018 - 4/9/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.24E-02 2.84E-03 2.86E-03 Sample ID: 472992 Sample Dates: 4/9/2018 -4/16/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.25E-02 2.83E-03 2.72E-03 Sample ID: 473273 Sample Dates: 4/16/2018 - 4/23/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.93E-02 2.68E-03 2.81E-03 Sample ID: 474161 Sample Dates: 5/1/2018 - 5/7/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.32E-02 3.82E-03 4.35E-03 Sample ID: 474539 Sample Dates: 5/7/2018 - 5/14/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.87E-02 3.52E-03 3.41 E-03 Sample ID: 474906 Sample Dates: 5/14/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.84E-02 2.88E-03 3.0SE-03 Sample ID: 475226 Sample Dates: 5/21/2018 - 5/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.03E-02 2.02E-03 2.41E-03 Sample ID: 475547 Sample Dates: 5/29/2018 - 6/4/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.29E-02 2.69E-03 3.37E-03 Sample ID: 476372 Sample Dates: 6/4/2018 - 6/11/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.06E-02 3.60E-03 3.48E-03 Sample ID: 477392 Sample Dates: 6/11/2018 - 6/18/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.41E-02 2.91E-03 2.72E-03 Sample ID: 478118 Sample Dates: 6/18/2018 - 6/25/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.95E-02 3.23E-03 3.73E-03 Sample ID: 478434 Sample Dates: 6/25/2018 - 7/2/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.SOE-02 2.86E-03 3.34E-03 Sample ID: 478807 Sample Dates: 4/2/2018 - 7/2/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <2 .13E-03 O.OOE+OO 2.1 3E-03 Cs-137 <1 .33E-03 0.00E+OO 1.33E-03 Be-7 1.74E-01 4.36E-02 4.14E-02 K-40 3.67E-02 1.85E-02 1.75E-02 Sample ID: 478801 Sample Dates: 7/2/2018 -7/9/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.87E-02 2.60E-03 2.58E-03 Sample ID: 479213 Sample Dates: 7/9/2018 - 7/16/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.25E-02 3.72E-03 3.70E-03 Sample ID: 479894 Sample Dates: 7/16/2018 - 7/23/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.37E-02 3.30E-03 3.47E-03 Sample ID: 480257 Sample Dates: 7/23/2018 - 7/30/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.07E-02 3.58E-03 3.32E-03 Sample ID: 481084 Sample Dates : 7/30/2018 - 8/6/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.37E-02 2.49E-03 2.98E-03 Sample ID: 481525 Sample Dates: 8/6/2018 -8/13/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.66E-02 2.87E-03 3.27E-03 Sample ID: 481975 Sample Dates: 8/13/2018 - 8/20/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.54E-02 3.40E-03 3.44E-03 Sample ID: 482493 Sample Dates: 8/20/2018 - 8/27/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.0SE-02 3.18E-03 3.57E-03 Sample ID: 482818 Sample Dates: 8/27/2018 - 9/4/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.08E-02 2.74E-03 2.SOE-03 Sample ID: 483440 Sample Dates: 9/4/2018 - 9/10/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.18E-02 3.14E-03 3.39E-03 Report Generated@ 5/1/2019 11 :57:36 Duke Energy Annual Report - Appendix E (En~ EnRad Laboratories 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 5 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR PARTICULATE Concentration (Activity): pCi/m3 Sample Point 078.1 [INDICATOR* WSW@0.53 miles]

Sample ID: 484037 Sample Dates: 9/10/2018

9/17/2018 Nuclide Activity 2 Sigma Error MDA Beta 7.15E-03 2.16E-03 3.03E-03 Sample ID: 484612 Sample Dates: 9/17/2018 -9/24/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.62E-02 3.37E-03 3.28E-03 Sample ID: 485037 Sample .Dates: 9/24/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.74E-02 2.91 E-03 3.25E-03 Sample ID: 485500 Sample Dates: 7/2/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.86E-03 O.OOE+OO 1.86E-03 Cs-137 <1 .40E-03 O.OOE+OO 1.40E-03 Be-7 1.59E-01 4.13E-02 4.15E-02 K-40 <4.09E-02 O.OOE+OO 4.09E-02 Sample ID: 485494 Sample Dates: 10/1/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.44E-02 3.64E-03 3.07E-03 Sample ID: 486177 Sample Dates: 10/8/2018 -10/15/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.70E-02 2.87E-03 3.14E-03 Sample ID: 486709 Sample Dates: 10/15/2018 -10/22/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.75E-02 3.47E-03 3.42E-03 Sample ID: 487748 Sample Dates: 10/22/2018 - 10/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.19E-02 3.22E-03 3.47E-03 Sample ID: 487992 Sample Dates: 10/29/2018 -11/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.02E-02 2.73E-03 2.B2E-03 Sample ID: 488484 Sample Dates : 11/5/2018 -11/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.13E-02 2.81 E-03 2.84E-03 Sample ID: . 488863 Sample Dates: 11/12/2018 -11/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.20E-02 3.15E-03 3.21E-03 Sample ID: 489160 Sample Dates: 11/19/2018 -11/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.63E-02 3.02E-03 2.82E-03 Sample ID: 489742 Sample Dates: 11/26/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.93E-02 3.14E-03 2.92E-03 Sample ID: 490165 Sample Dates: 12/3/2018 -12/10/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.69E-02 3.00E-03 3.49E-03 Sample ID: 490812 Sample Dates: 12/10/2018 -12/18/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.82E-02 2.43E-03 2.49E-03 Sample ID: 491187 Sample Dates: 12/18/2018 - 12/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.23E-02 2.92E-03 2.B2E-03 Sample ID: 491488 Sample Dates: 12/26/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.17E-02 3.56E-03 4.0SE-03 Sample ID: 491773 Sample Dates: 10/1/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.43E-03 0.00E+OO 1.43E-03 Cs-137 <2.12E-03 O.OOE+OO 2.12E-03 Be-7 1.67E-01 3.75E-02 2.77E-02 K-40 <3.12E-02 O.OOE+OO 3.12E-02 Sample Point 079 [ INDICATOR - NE@ 0.56 miles]

Sample ID: 465648 Sample Dates: 1/2/2018 -1/8/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.75E-02 4.24E-03 3.86E-03 Sample ID: 466009 Sample Dates: 1/8/2018 -1/15/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.B6E-02 3.10E-03 3.SSE-03 Sample ID: 466211 Sample Dates: 1/15/2018 -1/22/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.62E-02 3.31 E-03 3.18E-03 Sample ID: 466396 Sample Dates: 1/22/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.46E-02 2.70E-03 3.13E-03 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 6 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR PARTICULATE Concentration (Activity): pCi/m3 Sample Point 079 [ INDICATOR - NE @ 0.56 miles ]

Sample ID: 466994 Sample Dates: 1/29/2018 - 2/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.87E-02 2.96E-03 3.11E-03 Sample ID: 467346 Sample Dates: 2/5/2018 - 2/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.88E-02 2.89E-03 3.00E-03 Sample ID: 467670 Sample Dates: 2/12/2018. 2/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.68E-02 2.58E-03 2.77E-03 Sample ID: 468444 Sample Dates: 2/19/2018 - 2/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.24E-02 2.73E-03 3.42E~03 Sample ID: 468772 Sample Dates: 2/26/2018 - 3/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.06E-02 3.12E-03 3.31 E-03 Sample ID: 469580 Sample Dates: 3/5/2018

3/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.86E-02 2.69E-03 2.92E-03 Sample ID: 470615 Sample Dates: 3/12/2018 - 3/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.36E-02 3.27E-03 3.33E-03 Sample ID: 471166 Sample Dates: 3/19/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.56E-02 2.85E-03 3.31 E-03 Sample ID: 471727 Sample Dates: 3/26/2018 - 4/2/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.42E-02 2.49E-03 2.90E-03 Sample ID: 472524 Sample Dates: 1/2/2018

4/2/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1 .97E-03 O.OOE+OO 1.97E-03 Cs-137 <1 .15E-03 O.OOE+OO 1.15E-03 Be-7 1.44E-01 3.73E-02 3.37E-02 K-40 <2 .29E-02 O.OOE+OO 2.29E-02 Sample ID: 472518 Sample Dates: 4/2/2018

4/9/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.40E-02 2.92E-03 2.87E-03 Sample ID: 472993 Sample Dates: 4/9/2018 -4/16/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.94E-02 2.69E-03 2.73E-03 Sample ID: 473274 Sample Dates: 4/16/2018 - 4/23/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.17E-02 2.78E-03 2.SOE-03 Sample ID: 473646 Sample Dates: 4/23/2018

4/30/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.07E-02 2.60E-03 3.31 E-03 Sample ID: 474162 Sample Dates : 4/30/2018 - 5/7/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.60E-02 3.40E-03 3.48E-03 Sample ID: 474540 Sample Dates: 5/7/2018. 5/14/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.94E-02 3.49E-03 3.31E-03 Sample ID: 474907 Sample Dates: 5/14/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.83E-02 2.88E-03 3.06E-03 Sample ID: 475227 Sample Dates: 5/21/2018 - 5/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.06E-02 2.03E-03 2.39E-03 Sample ID: 475548 Sample Dates: 5/29/2018

6/4/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.43E-02 2.79E-03 3.41 E-03 Sample ID: 476373 Sample Dates: 6/4/2018 - 6/11/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.24E-02 3.68E-03 3.48E-03 Sample ID: 477393 Sample Dates: 6/11/2018

6/18/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.22E-02 2.96E-03 2.92E-03 Sample ID: 478119 Sample Dates: 6/18/2018 - 6/25/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.17E-02 3.35E-03 3.74E-03 Sample ID: 478435 Sample Dates: 6/25/2018 - 7/2/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.47E-02 2.79E-03 3.34E-03 Sample ID: 478808 Sample Dates: 4/2/2018 - 7/2/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.21E-03 O.OOE+OO 1.21E-03 Cs-137 <1 .51E-03 O.OOE+OO 1.51 E-03 Be-7 1.47E-01 3.43E-02 2.30E-02

([R- __)

Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 7 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR PARTICULATE Concentration (Activity): pCi/m3 Sample Point 079 [ INDICATOR - NE @ 0.56 miles ]

Sample ID: 478808 Sample Dates: 4/2/2018 - 7/2/2018 Nuclide Activity 2 Sigma Error MDA K-40 <2.28E-02 O.OOE+OO 2.28E-02 Sample ID: 478802 Sample Dates: 7/2/2018 - 7/9/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.84E-02 2.57E-03 2.58E-03 Sample ID: 479214 Sample Dates : 7/9/2018 -7/16/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.88E-02 3.57E-03 3.69E-03 Sample ID: 479895 Sample Dates: 7/16/2018 - 7/23/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.93E-02 3.10E-03 3.48E-03 Sample ID: 480258 Sample Dates: 7/23/2018 - 7/30/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.42E-02 3.29E-03 3.31 E-03 Sample ID: 481085 Sample Dates: 7/30/2018 - 8/6/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.51 E-02 2.SGE-03 2.98E-03 Sample ID: 481526 Sample Dates: 8/6/2018 -8/13/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.95E-02 2.98E-03 3.20E-03 Sample ID: 481976 Sample Dates: 8/13/2018 -8/20/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.51 E-02 3.44E-03 3.51 E-03 Sample ID: 482494 Sample Dates: 8/20/2018 - 8/27/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.15E-02 3.23E-03 3.57E-03 Sample ID: 482819 Sample Dates: 8/27/2018 -9/4/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.0SE-02 2.73E-03 2.59E-03 Sample ID: 483441 Sample Dates: 9/4/2018 -9/10/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.04E-02 3.07E-03 3.39E-03 Sample ID: 484038 Sample.Dates: 9/10/2018 -9/17/2018 Nuclide Activity

2 Sigma Error MDA Beta 5.02E-03 2.03E-03 3.02E-03 Sample ID: 484613 Sample Dates: 9/17/2018 - 9/24/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.SSE-02 3.34E-03 3.29E-03 Sample ID: 485038 Sample Dates: 9/24/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.40E-02 2.72E-03 3.23E-03 Sample ID: 485501 Sample Dates: 7/2/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.GOE-03 O.OOE+OO 1.SOE-03 Cs-137 <1.17E-03 0.00E+OO 1.17E-03 Be-7 1.15E-01 3.17E-02 2.85E-02 K-40 1.43E-02 1.16E-02 1.46E-02 Sample ID: 485495 Sample Dates: 10/1/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.28E-02 3.59E-03 3.09E-03 Sample ID: 486178 Sample Dates: 10/8/2018 -10/15/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.85E-02 2.95E-03 3.15E-03 Sample ID: 486710 Sample Dates: 10/15/2018 -10/22/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.38E-02 3.30E-03 3.42E-03 Sample ID: 487749 Sample Dates : 10/22/2018 -10/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.47E-02 2.86E-03 3.46E-03 Sample ID: 487993 Sample Dates: 10/29/2018 -11/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.95E-02 2.70E-03 2.82E-03 Sample ID: 488485 Sample Dates: 11/5/2018 -11/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.85E-02 2.68E-03 2.84E-03 Sample ID: 488864 Sample Dates: 11/12/2018 -11/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.99E-02 3.0SE-03 3.22E-03 Sample ID: 489161 Sample Dates: 11/19/2018 -11/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.34E-02 2.89E-03 2.82E-03 Sample ID: 489743 Sample Dates: 11/26/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.11E-02 2.80E-03 2.91E-03 Report Generated @ 5/1/2019 11 :57:36 Duke Energy Annual Report - Appendix E - --

cEn _)

EnRad Laboratories 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 8 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR PARTICULATE Concentration (Activity): pCi/m3 Sample Point 079 [ INDICATOR - NE @ 0.56 miles ]

Sample ID: 490166 Sample Dates: 12/3/2018 -12/10/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.SSE-02 2.93E-03 3.SOE-03 Sample ID: 490813 Sample Dates: 12/10/2018 -12/18/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.69E-02 2.37E-03 2.4SE-03 Sample ID: 491188 Sample Dates: 12/18/2018 -12/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.69E-02 2.66E-03 2.S3E-03 Sample ID: 491489 Sample Dates: 12/26/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.02E-02 3.46E-03 4 .0SE-03 Sample ID: 491774 Sample Dates : 10/1/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.25E-03 O.OOE+OO 1.25E-03 Cs- 137 <1.45E-03 O.OOE+OO 1.45E-03 Be-7 1.0GE-01 3.01E-02 2.66E-02 K-40 1.51E-02 1.01E-02 4.54E-03 Sample Point 081 [ CONTROL - SE @ 9.33 miles]

Sample ID: 465649 Sample Dates: 1/2/2018 -1/8/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.67E-02 4 .20E-03 3.S4E-03 Sample ID: 466010 Sample Dates: 1/8/2018 -1/15/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.66E-02 3.00E-03 3.SSE-03 Sample ID: 466212 Sample Dates: 1/15/2018 -1/22/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.S9E-02 3.43E-03 3.17E-03 Sample ID: 466397 Sample Dates : 1/22/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.36E-02 2.67E-03 3.17E-03 Sample ID: 466995 Sample Dates : 1/29/2018 - 2/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.59E-02 2.SOE-03 3.0SE-03 Sample ID: 467347 Sample Dates : 2/5/2018 -2/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.95E-02 2.92E-03 3.00E-03 Sample ID: 467671 Sample Dates : 2/12/2018

2/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.20E-02 2.33E-03 2.7SE-03 Sample ID: 468445 Sample Dates : 2/19/2018 - 2/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.0SE-02 2.61E-03 3.41E-03 Sample ID: 468773 Sample Dates : 2/26/2018 - 3/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.0SE-02 3.13E-03 3.32E-03 Sample ID: 469581 Sample Dates : 3/5/2018 -3/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.13E-02 2.SOE-03 2.90E-03 Sample ID: 470616 Sample Dates: 3/12/2018 - 3/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.29E-02 3.27E-03 3.3SE-03 Sample ID: 471167 Sample Dates: 3/19/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.79E-02 2.94E-03 3.28E-03 Sample ID: 471728 Sample Dates: 3/26/2018 - 4/2/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.36E-02 2.47E-03 2.9 1E-03 Sample ID: 472525 Sample Dates : 1/2/2018 - 4/2/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <9.9SE-04 O.OOE+OO 9.9SE-04 Cs-137 <1.75E-03 O.OOE+OO 1.75E-03 Be-7 1.SOE-01 3.SSE-02 2.2SE-02 K-40 <2.52E-02 O.OOE+OO 2.52E-02 Sample ID: 472519 Sample Dates : 4/2/2018 -4/9/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.32E-02 2.S7E-03 2.84 E-03 Sample ID: 472994 Sample Dates : 4/9/2018 - 4/16/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.16E-02 2.79E-03 2.73E-03 Sample ID: 473275 Sample Dates: 4/16/2018 -4/23/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.65E-02 2.56E-03 2.82E-03 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 9 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR PARTICULATE Concentration (Activity): pCi/m3 Sample Point 081 [ CONTROL - SE @ 9.33 miles]

Sample ID: 473647 Sample Dates: 4/23/2018 -4/30/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.17E-02 2.63E-03 3.28E-03 Sample ID: 474163 Sample Dates : 4/30/2018 - 5/7/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.59E-02 3.39E-03 3.49E-03 Sample ID: 474541 Sample Dates: 5/7/2018 -5/14/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.19E-02 3.61 E-03 3.33E-03 Sample ID: 474908 Sample Dates: 5/14/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.78E-02 2.84E-03 3.04E-03 Sample ID: 475228 Sample Dates: 5/21/2018 - 5/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.0SE-02 2.03E-03 2.40E-03 Sample ID: 475549 Sample Dates: 5/29/2018 - 6/4/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.46E-02 2.80E-03 3.38E-03 Sample ID: 476374 Sample Dates: 6/4/2018 - 6/11/2018 Nuclide Activity 2 Sigma Error MDA Beta 3. 0SE-02 3.60E-03 3.49E-03 Sample ID: 477394 Sample Dates : 6/11/2018 -6/18/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.39E-02 2.83E-03 2.61E-03 Sample ID: 478120 Sample Dates : 6/18/2018 - 6/25/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.30E-02 3.40E-03 3.73E-03 Sample ID: 478436 Sample Dates : 6/25/2018 - 7/2/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.51E-02 2.83E-03 3.35E-03 Sample ID: 478809 Sample Dates: 4/2/2018 - 7/2/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <2. 00E-03 O.OOE+OO 2.00E-03 Cs-137 <1.53E-03 O.OOE+OO 1.53E-03 Be-7 1.97E-01 4.38E-02 3.S4E-02 K-40 1.82E-02 1.11 E-02 4.49E-03 Sample ID: 478803 Sample Dates: 7/2/2018 - 7/9/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.03E-02 2.67E-03 2.57E-03 Sample ID: 479215 Sample Dates: 7/9/2018 -7/16/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.18E-02 3.70E-03 3.71 E-03 Sample ID: 479896 Sample Dates: 7/16/2018 - 7/23/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.18E-02 3.22E-03 3.48E-03 Sample ID: 480259 Sample Dates: 7/23/2018 - 7/30/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.74E-02 3.43E-03 3.30E-03 Sample ID: 481086 Sample Dates : 7/30/2018 - 8/6/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.35E-02 2.48E-03 2.98E-03 Sample ID: 481527 Sample Dates: 8/6/2018 - 8/13/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.83E-02 2.97E-03 3.28E-03 Sample ID: 481977 Sample Dates : 8/13/2018 - 8/20/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.40E-02 3.33E-03 3.42E-03 Sample ID: 482495 Sample Dates: 8/20/2018 - 8/27/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.21E-02 3.25E-03 3.57E-03 Sample ID: 482820 Sample Dates: 8/27/2018 -9/4/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.21 E-02 2.80E-03 2.60E-03 Sample ID: 483442 Sample Dates: 9/4/2018 - 9/10/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.79E-02 2.96E-03 3.39E-03 Sample ID: 484039 Sample Dates : 9/10/2018 - 9/17/2018 Nuclide Activity 2 Sigma Error MDA Beta 7. 13E-03 2.17E-03 3.04E-03 Sample ID: 484614 Sample Dates : 9/17/2018 - 9/24/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.60E-02 3.36E-03 3.27E-03 Sample ID: 485039 Sample Dates : 9/24/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.20E-02 2.62E-03 3.25E-03 Report Generated@ 5/1/2019 11 :57:36 Duke Energy Annual Report - Appendix E - ----

<En_)

EnRad Laboratories 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 1O of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR PARTICULATE Concentration (Activity): pCi/m3 Sample Point 081 [ CONTROL - SE @ 9.33 miles ]

Sample ID: 485502 Sample Dates: 7/2/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.27E-03 O.OOE+OO 1.27E-03 Cs-137 <8.22E-04 O.OOE+OO 8.22E-04 Be-7 1.41E-01 3.72E-02 3.61E-02 K-40 <3.73E-02 0.00E+OO 3.73E-02 Sample ID: 485496 Sample Dates: 10/1/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.62E-02 3.73E-03 3.0SE-03 Sample ID: 486179 Sample Dates: 10/8/2018 -10/15/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.67E-02 2.84E-03 3.12E-03 Sample ID: 486711 Sample Dates: 10/15/2018 -10/22/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.34E-02 3.28E-03 3.42E-03 Sample ID: 487750 Sample Dates: 10/22/2018 -10/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.SBE-02 3.07E-03 3.48E-03 Sample ID: 487994 Sample Dates: 10/29/2018 -11/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.91E-02 2.69E-03 2.83E-03 Sample ID: 488486 Sample Dates: 11/5/2018 -11/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.41E-02 2.46E-03 2.83E-03 Sample ID: 488865 Sample Dates: 11/12/2018 -11/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.83E-02 2.96E-03 3.20E-03 Sample ID: 489162 Sample Dates: 11/19/2018 -11/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.62E-02 3.02E-03 2.83E-03 Sample ID: 489744 Sample Dates: 11/26/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.14E-02 2.82E-03 2.91 E-03 Sample ID: 490167 Sample Dates: 12/3/2018 -12/10/2018 Nuclide

Activity 2 Sigma Error MDA Beta 1.69E-02 2.99E-03 3.49E-03 Sample ID: 490814 Sample Dates: 12/10/2018 - 12/18/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.67E-02 2.36E-03 2.49E-03 Sample ID: 491189 Sample Dates: 12/18/2018 -12/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.75E-02 2.68E-03 2.82E-03 Sample ID: 491490 Sample Dates: 12/26/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Beta 2. 15E-02 3.56E-03 4.1OE-03 Sample ID: 491775 Sample Dates: 10/1/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.82E-03 O.OOE+OO 1.82E-03 Cs-137 <1.0SE-03 O.OOE+OO 1.0SE-03 Be-7 1.09E-01 3.09E-02 2.66E-02 K-40 <3.33E-02 O.OOE+OO 3.33E-02 Sample Point 084 [ INDICATOR - NNE @ 2.58 miles ]

Sample ID: 465650 Sample Dates : 1/2/2018 -1/8/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.90E-02 3.SSE-03 3.SSE-03 Sample ID: 466011 Sample Dates: 1/8/2018 -1/15/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.63E-02 2.98E-03 3.54E-03 Sample ID: 466213 Sample Dates: 1/15/2018 -1/22/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.36E-02 3.20E-03 3.1SE-03 Sample ID: 466398 Sample Dates: 1/22/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.35E-02 2.GGE- 03 3.15E-03 Sample ID: 466996 Sample Dates: 1/29/2018 - 2/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.70E-02 2.87E-03 3.0SE-03 Sample ID: 467348 Sample Dates: 2/5/2018 - 2/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.56E-02 2.71 E-03 3.00E-03 Sample ID: 467672 Sample Dates: 2/12/2018 - 2/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.35E-02 2.41 E-03 2.77E-03 Report Generated@ 5/1/2019 11:57:36 EnRad Laboratories Appendix E - Page 11 of 91 Duke Energy Annual Report -Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR PARTICULATE Concentration (Activity): pCi/m3 Sample Point 084 [ INDICATOR - NNE@ 2.58 miles]

Sample ID: 468446 Sample Dates: 2/19/2018 -2/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.09E-02 2.64E-03 3.42E-03 Sample ID: 468774 Sample Dates: 2/26/2018 - 3/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.93E-02 3.0SE-03 3.31 E-03 Sample ID: 469582 Sample Dates: 3/5/2018 -3/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.0SE-02 2.78E-03 2.92E-03 Sample ID: 470617 Sample Dates: 3/12/2018 - 3/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.19E-02 3.19E-03 3.34E-03 Sample ID: 471168 Sample Dates: 3/19/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.45E-02 2.79E-03 3.31 E-03 Sample ID: 471729 Sample Dates: 3/26/2018 -4/2/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.53E-02 2.54E-0 3 2.90E-03 Sample ID: 472526 Sample Dates: 1/2/2018 - 4/2/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.48E-03 O.OOE+OO 1.48E-03 Cs-137 <1.47E-03 O.OOE+OO 1.47E-03 Be-7 1.47E-01 3.59E-02 2.52E-02 K-40 <2.83E-02 O.OOE+OO 2.83E-02 Sample ID: 472520 Sample Dates: 4/2/2018 -4/9/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.03E-02 2.76E-03 2.86E-03 Sample ID: 472995 Sample Dates : 4/9/2018 -4/16/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.94E-02 2.69E-03 2.72E-03 Sample ID: 473276 Sample Dates: 4/16/2018 -4/23/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.57E-02 2.51 E-03 2.BOE-03 Sample ID: 473648 Sample Dates : 4/23/2018 - 4/30/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.29E-02 2.73E-03 3.31E-03 Sample ID: 474164 Sample Dates: 4/30/2018 -5/7/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.46E-02 3.33E-03 3.47E-03 Sample ID: 474542 Sample Dates: 5nl2018 - 5/14/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.52E-02 3.31 E-03 3.32E-03 Sample ID: 474909 Sample Dates: 5/14/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.47E-02 2.68E-03 3.0SE-03 Sample ID: 475229 Sample Dates: 5/21/2018 - 5/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.0SE-02 2.03E-03 2.41 E-03 Sample ID: 475550 Sample Dates: 5/29/2018 -6/4/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.17E-02 2.64E-03 3.37E-03 Sample ID: 476375 Sample Dates: 6/4/2018 - 6/11/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.58E-02 3.40E-03 3.49E-03 Sample ID: 477395 Sample Dates: 6/11/2018 -6/18/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.0SE-02 2.69E-03 2.62E-03 Sample ID: 478121 Sample Dates: 6/18/2018 - 6/25/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.98E-02 3.25E-03 3.73E-03 Sample ID: 478437 Sample Dates: 6/25/2018 - 7/2/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.31 E-02 2.71 E-03 3.34E-03 Sample ID: 478810 Sample Dates: 4/2/2018 -7/2/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.70E-03 O.OOE+OO 1.70E-03 Cs- 137 <1.40E-03 O.OOE+OO 1.40E-03 Be-7 1.56E-01 4.04E-02 3.89E-02 K-40 <3.28E-02 O.OOE+OO 3.28E-02 Sample ID: 478804 Sample Dates : 7/2/2018 - 7/9/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.99E-02 2.65E-03 2.58E-03 Sample ID: 479216 Sample Dates : 7/9/2018 - 7/16/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.66E-02 3.48E-03 3.70E-03

- EnRad Laboratories (En 3 Report Generated@ 5/1/201911:57:36 Appendix E - Page 12 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road

~

Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR PARTICULATE Concentration (Activity): pCi/m3 Sample Point 084 [ INDICATOR - NNE @ 2.58 miles ]

Sample ID: 479897 Sample Dates: 7/16/2018

7/23/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.22E-02 3.24E-03 3.47E-03 Sample ID: 480260 Sample Dates: 7/23/2018

7/30/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.79E-02 3.45E-03 3.31 E-03 Sample ID: 481087 Sample Dates: 7/30/2018 - 8/6/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.44E-02 2.53E-03 2.98E-03 Sample ID: 481528 Sample Dates: 8/6/2018 -8/13/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.0SE-02 3.0SE-03 3.26E-03 Sample ID: 481978 Sample Dates: 8/13/2018 - 8/20/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.0?E-02 3.63E-03 3.44E-03 Sample ID: 482496 Sample Dates: 8/20/2018 - 8/27/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.24E-02 3.26E-03 3.57E-03 Sample ID: 482821 Sample Dates: 8/27/2018

9/4/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.25E-02 2.82E-03 2.SOE-03 Sample ID: 483443 Sample Dates: 9/4/2018 -9/10/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.39E-02 3.23E-03 3.39E-03 Sample ID: 484040 Sample Dates: 9/10/2018 - 9/17/2018 Nuclide Activity 2 Sigma Error MDA Beta 6.56E-03 2.13E-03 3.03E-03 Sample ID: 484615 Sample Dates: 9/17/2018 -9/24/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.94E-02 3.51E-03 3.28E-03 Sample ID: 485040 Sample Dates: 9/24/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.68E-02 2.88E-03 3.25E-03 Sample ID: 485503 Sample Dates: 7/2/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.22E-03 O.OOE+OO 1.22E-03 Cs-137 <1.16E-03 O.OOE+OO 1.16E-03 Be-7 1.19E-01 3.39E-02 3.4SE-02 K-40 <2.29E-02 0.00E+OO 2.29E-02 Sample ID: 485497 Sample Dates: 10/1/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.62E-02 3.71E-03 3.0?E-03 Sample ID: 486180 Sample Dates: 10/8/2018 -10/15/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.BSE-02 2.94E-03 3.14E-03 Sample ID: 486712 Sample Dates: 10/15/2018 -10/22/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.12E-02 3.62E-03 3.42E-03 Sample ID: 487751 Sample Dates: 10/22/2018 - 10/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.87E-02 3.0SE-03 3.47E-03 Sample ID: 487995 Sample Dates: 10/29/2018 -11/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.15E-02 2.SOE-03 2.82E-03 Sample ID: 488487 Sample Dates: 11/5/2018

11/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.96E-02 2.74E-03 2.83E-03 Sample ID: 488866 Sample Dates: 11/12/2018 -11/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.12E-02 3.10E-03 3.21 E-03 Sample ID: 489163 Sample Dates: 11/19/2018 -11/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.57E-02 2.99E-03 2.82E-03 Sample ID: 489745 Sample Dates: 11/26/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.31E-02 2.89E-03 2.92E-03 Sample ID: 490168 Sample Dates: 12/3/2018 -12/10/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.SOE-02 3.1 0E-03 3.57E-03 Sample ID: 490815 Sample Dates: 12/10/2018 -12/18/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.83E-02 2.43E-03 2.49E-03 Sample ID: 491190 Sample Dates: 12/18/2018 -12/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.76E-02 2.69E-03 2.82E-03 Report Generated@ 5/1/2019 11 :57:36 Duke Energy Annual Report - Appendix E (f]- _j) -- EnRad Laboratories 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 13 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR PARTICULATE Concentration (Activity): pCi/m3 Sample Point 084 [ INDICATOR - NNE @ 2.58 miles ]

Sample ID: 491491 Sample Dates: 12/26/2018 - 12/31/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.01 E-02 3.48E-03 4.07E-03 Sample ID: 491776 Sample Dates: 10/1/2018 - 12/31/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.37E-03 O.OOE+OO 1.37E-03 Cs-137 <1.12E-03 0.00E+OO 1.12E-03 Be-7 1.23E-01 3.46E-02 3.20E-02 K-40 <2.89E-02 O.OOE+OO 2.89E-02 Sample Point 085 ( INDICATOR - NNW@ 0.88 miles]

Sample ID: 465651 Sample Dates: 1/2/2018 -1/8/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.49E-02 4.12E-03 3.BSE-03 Sample ID: 466012 Sample Dates: 1/8/2018 -1/15/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.67E-02 3.01E-03 3.SSE-03 Sample ID: 466214 Sample Dates: 1/15/2018 -1/22/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.70E-02 3.35E-03 3.18E-03 Sample ID: 468007 Sample Dates: 1/22/2018 -1/24/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.51E-02 4.89E-03 6.3SE-03 Cs-134 <2.93E-02 O.OOE+OO 2.93E-02 Cs-137 <2.31E-02 O.OOE+OO 2.31 E-02 Be-7 <2.SSE-01 O.OOE+OO 2.SSE-01 K-40 5.59E-01 2.79E-01 3.65E-01 Sample ID: 466399 Sample Dates: 1/24/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.43E-02 3.47E-03 4.43E-03 Sample ID: 466997 Sample Dates: 1/29/2018 - 2/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.42E-02 2.71 E-03 3.0BE-03 Sample ID: 467349 Sample Dates: 2/5/2018 - 2/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.81E-02 2.BSE-03 3.01 E-03 Sample ID: 467673 Sample Dates: 2/12/2018

2/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.SOE-02 2.49E-03 2.77E-03 Sample ID: 468447 Sample Dates: 2/19/2018 - 2/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.33E-02 2.77E-03 3.42E-03 Sample ID: 468775 Sample Dates : 2/26/2018 - 3/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.90E-02 3.04E-03 3.31 E-03 Sample ID: 469583 Sample Dates: 3/5/2018 - 3/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.53E-02 2.99E-03 2.92E-03 Sample ID: 470618 Sample Dates: 3/12/2018 - 3/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.22E-02 3.21E-03 3.35E-03 Sample ID: 471169 Sample Dates: 3/19/2018. 3/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.41E-02 2.77E-03 3.31 E-03 Sample ID: 471730 Sample Dates: 3/26/2018 - 4/2/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.44E-02 2.SOE-03 2.89E-03 Sample ID: 472527 Sample Dates: 1/2/2018

4/2/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.BOE-03 0.00E+OO 1.BOE-03 Cs-137 <1.61E-03 O.OOE+OO 1.61 E-03 Be-7 1.59E-01 3.76E-02 2.01 E-02 K-40 <2.77E-02 O.OOE+OO 2.77E-02 Sample ID: 472521 Sample Dates : 4/2/2018 -4/9/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.22E-02 2.84E-03 2.86E-03 Sample ID: 472996 Sample Dates: 4/9/2018 -4/16/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.12E-02 2.76E-03 2.72E-03 Sample ID: 473277 Sample Dates: 4/16/2018 - 4/23/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.BBE-02 2.66E-03 2.81E-03 Sample ID: 473649 Sample Dates: 4/23/2018 -4/30/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.35E-02 2.75E-03 3.30E-03 Report Generated @ 5/1/2019 11 :57:36 - -.._ EnRad Laboratories Appendix E - Page 14 of 91 Duke Energy Annual Report - Appendix E CEn __) 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR PARTICULATE Concentration (Activity): pCi/m3 Sample Point 085 [ INDICATOR - NNW@ 0.88 miles]

Sample ID: 474165 Sample Dates : 4/30/2018 - 5/7/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.SOE-02 3.39E-03 3.48E-03 Sample ID: 474543 Sample Dates: 5/7/2018 - 5/14/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.12E-02 3.57E-03 3.33E-03 Sample ID: 474910 Sample Dates: 5/14/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.70E-02 2.81E-03 3.0SE-03 Sample ID: 475230 Sample Dates : 5/21/2018 - 5/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.20E-02 2.11 E-03 2.41 E-03 Sample ID: 475551 Sample Dates : 5/29/2018 - 6/4/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.37E-02 2.74E-03 3.37E-03 Sample ID: 476376 Sample Dates : 6/4/2018 -6/11/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.07E-02 3.61 E-03 3.48E-03 Sample ID: 477396 Sample Dates: 6/11/2018 - 6/18/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.20E-02 2.75E-03 2.62E-03 Sample ID: 478122 Sample Dates : 6/18/2018 - 6/25/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.83E-02 3.18E-03 3.73E-03 Sample ID: 478438 Sample Dates: 6/25/2018 - 7/2/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.58E-02 2.86E-03 3.34E-03 Sample ID: 478811 Sample Dates: 4/2/2018 - 7/2/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <9.93E-04 O.OOE+OO 9.93E-04 Cs-137 <2. 99E-04 0.00E+OO 2.99E-04 Be-7 1.40E-01 3.70E-02 3.55E-02 K-40 <2.37E-02 O.OOE+OO 2.37E-02 Sample ID: 478805 Sample Dates : 7/2/2018 - 7/9/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.00E-02 2.66E-03 2.58E-03 Sample ID: 479217 Sample Dates : 7/9/2018 -7/16/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.63E-02 3.47E-03 3.70E-03 Sample ID: 479898 Sample Dates : 7/16/2018 - 7/23/2018 Nuclide Activity 2 Sigma Error MDA Beta 2. 0SE-02 3.16E-03 3.47E-03 Sample ID: 480261 Sample Dates: 7/23/2018 - 7/30/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.41 E-02 3.28E-03 3.31E-03 Sample ID: 481088 Sample Dates: 7/30/2018 - 8/6/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.12E-02 2.37E-03 2.98E-03 Sample ID: 481529 Sample Dates: 8/6/2018 -8/13/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.BOE-02 2.94E-03 3.26E-03 Sample ID: 481979 Sample Dates : 8/13/2018 -8/20/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.51E-02 3.39E-03 3.44E-03 Sample ID: 482497 Sample Dates : 8/20/2018 -8/27/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.09E-02 3. 19E-03 3.57E-03 Sample ID: 482822 Sample Dates : 8/27/2018 - 9/4/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.18E-02 2.78E-03 2.60E-03 Sample ID: 483444 Sample Dates : 9/4/2018 -9/10/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.02E-02 3.0SE-03 3.39E-03 Sample ID: 484041 Sample Dates: 9/10/2018 - 9/17/2018 Nuclide Activity 2 Sigma Error MDA Beta 8.61E-03 2.25E-03 3.03E-03 Sample ID: 484616 Sample Dates : 9/17/2018 -9/24/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.71 E-02 3.42E-03 3.28E-03 Sample ID: 485041 Sample Dates : 9/24/2018 - 10/1/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.77E-02 2.93E-0 3 3.25E-03 Sample ID: 485504 Sample Dates : 7/2/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.59E-03 O.OOE+OO 1.59E-03 Cs-137 <8.90E-04 O.OOE+OO 8.90E-04 Be-7 1.53E-01 3.89E-02 3.45E-02 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Duke Energy Annual Report - Appendix E (lg_~ 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 15 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR PARTICULATE Concentration (Activity): pCi/ni3 Sample Point 085 [ INDICATOR - NNW @ 0.88 miles]

Sample ID: 485504 Sample Dates: 7/2/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA K-40 <2.89E-02 O.OOE+OO 2.89E-02 Sample ID: 485498 Sample Dates : 10/1/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA Beta 3.12E-02 3.51E-03 3.07E-03 Sample ID: 486181 Sample Dates: 10/8/2018 - 10/15/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.7BE-02 2.91 E-03 3.14E-03 Sample ID: 486713 Sample Dates: 10/15/2018 -10/22/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.39E-02 3.31 E-03 3.42E-03 Sample ID: 487752 Sample Dates : 10/22/2018 - 10/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.93E-02 3.09E-03 3.47E-03 Sample ID: 487996 Sample Dates: 10/29/2018 -11/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.92E-02 2.69E-03 2.82E-03 Sample ID: 488488 Sample Dates: 11/5/2018 -11/12/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.14E-02 2.82E-03 2.84E-03 Sample ID: 488867 Sample Dates: 11/12/2018 -11/19/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.03E-02 3.0GE-03 3.21E-03 Sample ID: 489164 Sample Dates: 11/19/2018 -11/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.43E-02 2.93E-03 2.82E-03 Sample ID: 489746 Sample Dates: 11/26/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.24E-02 2.86E-03 2.92E-03 Sample ID: 490169 Sample Dates: 12/3/2018 -12/10/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.71E-02 3.01E-03 3.49E-03 Sample ID: 490816 Sample Dates: 12/10/2018 -12/18/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.69E-02 2.45E-03 2.61E-03 Sample ID: 491191 Sample Dates: 12/18/2018 -12/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.66E-02 2.63E-03 2.81 E-03 Sample ID: 491492 Sample Dates: 12/26/2018 - 12/31/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.28E-02 3.62E-03 4.0BE-03 Sample ID: 491777 Sample Dates: 10/1/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.93E-03 O.OOE+OO 1.93E-03 Cs-137 <8.25E-04 0.00E+OO 8.25E-04 Be-7 9.83E-02 3.49E-02 4.29E-02 K-40 2.22E-02 1.24E-02 4.63E-03 Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 077 [ INDICATOR - SW@ 1 miles]

Sample ID: 465658 Sample Dates : 1/2/2018 -1/8/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.55E-02 O.OOE+OO 2.55E-02 Cs-134 <2.30E-02 O.OOE+OO 2.30E-02 Cs-137 <2.02E-02 0.00E+OO 2.02E-02 Be-7 < 1.45E-01 O.OOE+OO 1.45E-01 K-40 4.38E-01 2.32E-01 3.0SE-01 Sample ID: 466013 Sample Dates: 1/8/2018 -1/15/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1.84E-02 O.OOE+OO 1.84E-02 Cs-134 <1.90E-02 0.00E+OO 1.90E-02 Cs- 137 <1.52E-02 O.OOE+OO 1.52E-02 Be-7 <1.17E-01 O.OOE+OO 1.17E-01 K-40 4.01 E-01 1.87E-01 2.26E-01 Sample ID: 466215 Sample Dates: 1/15/2018 -1/22/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.45E-02 O.OOE+OO 2.45E-02 Cs-134 <1.SOE-02 0.00E+OO 1.6 0E-02 Cs-137 <1.BBE-02 O.OOE+OO 1.BBE-02 Be-7 <1.27E-01 0.00E+OO 1.27E-01 K-40 5.53E-01 1.74E-01 3.49E-02 Sample ID: 466400 Sample Dates: 1/22/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.16E-02 0.00E+OO 2.16E-02 Report Generated@ 5/1/2019 11 :57:36 --.... EnRad Laboratories Appendix E - Page 16 of 91 Duke Energy Annual Report - Appendix E ell! _) 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 077 [ INDICATOR - SW @ 1 miles ]

Sample ID: 466400 Sample Dates: 1/22/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA Cs- 134 < 1.72E-02 O.OOE+OO 1.72E-02 Cs-137 <1.35E-02 O.OOE+OO 1.35E-02 Be-7 <1 .21 E-01 O.OOE+OO 1.21E-01 K-40 6.71E-01 2.0SE-01 1.51E-01 Sample ID: 466998 Sample Dates: 1/29/2018 - 2/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.26E-02 O.OOE+OO 2.26E-02 Cs-134 <2.01 E-02 0.00E+OO 2.01E-02 Cs-137 <2.14E-02 O.OOE+OO 2.14E-02 Be-7 <1.14E-01 O.OOE+OO 1.14E-01 K-40 6.47E-01 2.01E-01 1.44E-01 Sample ID: 467350 Sample Dates : 2/5/2018 - 2/12/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.03E-02 O.OOE+OO 2.03E-02 Cs-134 <2.07E-02 0.00E+OO 2.07E-02 Cs-137 < 1.57E-02 O.OOE+OO 1.57E-02 Be-7 < 1.33E-01 O.OOE+OO 1.33E-01 K-40 3.SSE-01 1.54E-01 1.49E-01 Sample ID: 467674 Sample Dates: 2/12/2018

2/19/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.24E-02 O.OOE+OO 2.24E-02 Cs-134 <1.62E-02 O.OOE+OO 1.62E-02 Cs-137 <2.03E-02 0.00E+OO 2 .03E-02 Be-7 <1 .14E-01 O.OOE+OO 1.14E-01 K-40 6.45E-01 2.0SE-01 1.63E-01 Sample ID: 468448 Sample Dates: 2/19/2018 - 2/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.27E-02 O.OOE+OO 2.27E-02 Cs-134 <2.07E-02 O.OOE+OO 2.07,E-02 Cs-137 < 1.67E-02 O.OOE+OO 1.67E-02 Be-7 < 1.08E-01 O.OOE+OO 1.0BE-01 K-40 5.54E-01 2.08E-01 2.23E-01 Sample ID: 468776 Sample Dates : 2/26/2018 - 3/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.41E-02 O.OOE+OO 2.41 E-02 Cs-134 < 1.45E-02 O.OOE+OO 1.45E-02 Cs-137 <1.SSE-02 O.OOE+OO 1.SSE-02 Be-7 <1.03E-01 O.OOE+OO 1.03E-01 K-40 6.54E-01 2.13E-01 1.92E-01 Sample ID: 469584 Sample Dates: 3/5/2018 -3/12/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .0SE-02 O.OOE+OO 2.06E-02 Cs-134 < 1.7 1 E-02 O.OOE+OO 1.71 E-02 Cs-137 < 1.76E-02 0.00E+OO 1.76E-02 Be-7 < 1.19E-01 O.OOE+OO 1.19E-01 K-40 5.53E-01 1.86E-01 1.49E-01 Sample ID: 470619 Sample Dates: 3/12/2018 - 3/19/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.19E-02 O.OOE+OO 2.19E-02 Cs- 134 <1.44E-02 O.OOE+OO 1.44E-02 Cs-137 < 1.42E-02 O.OOE+OO 1.42E-02 Be-7 < 1.43E-01 O.OOE+OO 1.43E-01 K-40 4 .99E-01 1.77E-01 1.41 E-01 Sample ID: 471170 Sample Dates : 3/19/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .SSE-02 O.OOE+OO 2.SSE-02 Cs-134 < 1.68E-02 O.OOE+OO 1.68E-02 Cs-137 < 1.98E-02 O.OOE+OO 1.98E-02 Be-7 < 1.32E-01 O.OOE+OO 1.32E-01 K-40 4.39E-01 2 .13E-01 2.75E-01 Sample ID: 471731 Sample Dates: 3/26/2018

4/2/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.25E-02 O.OOE+OO 2.25E-02 Cs-134 <1 .36E-02 O.OOE+OO 1.36E-02 Cs-137 <1. 80E-02 O.OOE+OO 1.BOE-02 Be-7 <1.12E-01 O.OOE+OO 1.12E-01 K-40 4 .36E-01 1.96E-01 2.35E-01 Sample ID: 472528 Sample Dates: 4/2/2018 -4/9/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.89E-02 O.OOE+OO 1.89E-02 EnRad Laboratories Report Generated @ 5/1/2019 11 :57:36 Duke Energy Annual Report - Appendix E ,_ En ~ 13339 Hagers Ferry Road Appendix E - Page 17 of 91 Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: Ai°R RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 077 [ INDICATOR - SW@ 1 miles]

Sample ID: 472528 Sample Dates: 4/2/2018 -4/9/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 < 1.91 E-02 0.00E+OO 1.91 E-02 Cs-137 <1.63E-02 O.OOE+OO 1.63E- 02 Be-7 <1.07E-01 O.OOE+OO 1.07 E-0 1 K-40 3.15E- 01 1.81E-01 2.45E-0 1 Sample ID: 472997 Sample Dates: 4/9/2018 -4/16/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <2.47E-02 O.OOE+OO 2.47E-02 Cs-134 <1 .76E-02 O.OOE+OO 1.76E-02 Cs-137 <1.86E-02 O.OOE+OO 1.86E-02 Be-7 < 1.11E-01 O.OOE+OO 1.11E-01 K-40 4 .68E- 01 1.60E-01 3.52E-02 Sample ID: 473278 Sample Dates : 4/16/2018 - 4/23/2018 Nuclide Activity 2 Sigma Error MDA 1-1 3 1 <2 .20E- 02 O.OOE+OO 2.20E- 02 Cs- 134 < 1.77 E-02 O.OOE+OO 1.77 E-02 Cs-137 < 1.40E-02 O.OOE+OO 1.40E-02 Be-7 <1 .12E-01 O.OOE+OO 1.12E-01 K-40 3.94E-01 1.88E-01 2 .33E-01 Sample ID: 473650 Sample Dates : 4/23/2018 - 4/30/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.49E-02 O.OOE+OO 2.49E-02 Cs-134 < 1.95E-02 O.OOE+OO 1.95E-02 Cs-137 < 1.61 E-02 O.OOE+OO 1.61 E-02 Be-7 < 1.32E-01 O.OOE+OO 1.32E-0 1 K-40 3.46E-01 1.8 1E-01 2. 30E-0 1 Sample ID: 474166 Sample Dates: 4/30/2018 - 5nt2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.78E-02 O.OOE+OO 1.78E-02 Cs- 134 < 1.73E-02 O.OOE;+OO 1.73E-02 Cs-137 < 1.95E-02 O.OOE+OO 1.95E-02 Be-7 < 1.17E- 01 0.00E+OO 1.17E- 01 K-40 4 .51E- 01 1.76E-01 1.70E- 01 Sample ID: 474544 Sample Dates : 5nt2018 -5/14/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .06E-02 O.OOE+OO 2.06E-02 Cs-134 < 1.SSE- 02 O.OOE+OO 1.SSE-02 Cs-137 < 1.67E- 02 0.00E+OO 1.67E- 02 Be-7 < 1.23E-01 O.OOE+OO 1.23E-01 K-40 6. 15E-01 1.96E-01 1.38E-01 Sample ID: 474911 Sample Dates : 5/14/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.36E-02 O.OOE+OO 2 .36E-02 Cs- 134 < 1.96E- 02 0.00E+OO 1.96E- 02 Cs- 137 <1.77E-02 O.OOE+OO 1.77 E-02 Be-7 < 1.23E-01 O.OOE+OO 1.23E-0 1 K-40 <3 .74E-01 O.OOE+OO 3.74E-01 Sample ID: 475231 Sample Dates: 5/21/2018 - 5/29/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.88E-02 O.OOE+OO 1.88E-02 Cs-134 <9.62 E-03 O.OOE+OO 9.62E-03 Cs- 137 < 1.SSE-02 O.OOE+OO 1.5 5E-02 Be-7 < 1.0SE-01 O.OOE+OO 1.0SE-01 K-40 <3.72E-01 0.00E+OO 3.72E-0 1 Sample ID: 475552 Sample Dates : 5/29/2018 -6/4/2018 Nuclide Activity 2 Sigma Erro r MDA 1-131 <2.66E-02 O.OOE+ OO 2.66E-02 Cs-134 <2.23E-02 O.OOE+OO 2.23E-02 Cs-137 <2.07E-02 O.OOE+OO 2.07E-02 Be-7 < 1.54E-01 0.00E+OO 1.54E-01 K-40 4 .SOE-01 2.09E-01 2.34E-01 Sample ID: 476377 Sample Dates : 6/4/2018 - 6/11/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.22E-02 0.00E+OO 2.22E-02 Cs- 134 <2.11E-02 O.OOE+OO 2.11 E-02 Cs-137 <1.60E-02 O.OOE+OO 1.GOE-02 Be-7 <1.27E-01 O.OOE+OO 1.27E-01 K-40 4.78E-01 1.62E-01 3.50E- 02 Sample ID: 477397 Sample Dates : 6/11/2018 - 6/18/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .34E-02 O.OOE+OO 2.34E-02 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 18 of 91 Duke Energy Annual Report - Appendix E :~ 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (ActMty): pCi/m3 Sample Point 077 [ INDICATOR - SW@ 1 miles ]

Sample ID: 477397 Sample Dates: 6/11/2018 -6/18/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1 .33E-02 O.OOE+OO 1.33E-02 Cs-137 <1.57E-02 O.OOE+OO 1.57E-02 Be-7 <1.0SE-01 O.OOE+OO 1.0SE-01 K-40 5.75E-01 1.95E-01 1.72E-01 Sample ID: 478123 Sample Dates: 6/18/2018 - 6/25/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.36E-02 O.OOE+OO 2.36E-02 Cs-134 <1.46E-02 O.OOE+OO 1.46E-02 Cs-137 <1.71E-02 O.OOE+OO 1.71E-02 Be-7 <1.21E-01 O.OOE+OO 1.21E-01 K-40 4.57E-01 1.69E-01 1.35E-01 Sample ID: 478439 Sample Dates : 6/25/2018 - 7/2/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.17E-02 O.OOE+OO 2.17E-02 Cs-134 <1.59E-02 0.00E+OO 1.59E-02 Cs- 137 <2.0SE-02 O.OOE+OO 2.0SE-02 Be-7 <1.26E-01 O.OOE+OO 1.26E-01 K-40 5.77E-01 2.17E-01 2.38E-01 Sample ID: 478812 Sample Dates: 7/2/2018 - 7/9/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.33E-02 O.OOE+OO 2.33E-02 Cs-134 <1.93E-02 O.OOE+OO 1.93E-02 Cs-137 <1.59E-02 O.OOE+OO 1.59E-02 Be-7 <1.06E-01 O.OOE+OO 1.0GE-01 K-40 <3.84E-01 O.OOE+OO 3.84E-01 Sample ID: 479218 Sample Dates: 7/9/2018 - 7/16/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.SSE-02 O.OOE+OO 2.SSE-02 Cs-134 < 1.95E-02 O.OOE+OO 1.95E-02 Cs-137 < 1.56E-02 O.OOE+OO 1.56E-02 Be-7 <1.36E-01 O.OOE+OO 1.36E-01 K-40 5.68E-01 1.85E-01 1.34E-01 Sample ID: 479899 Sample Dates: 7/16/2018 - 7/23/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.19E-02 O.OOE+OO 2.19E-02 Cs-134 <1.76E-02 O.OOE+OO 1.76E-02 Cs-137 <1.94E-02 O.OOE+OO 1.94E-02 Be-7 <1.19E-01 O.OOE+OO 1.19E-01 K- 40 3.81E-01 2.11 E-01 2.89E-01 Sample ID: 480262 Sample Dates: 7/23/2018 - 7/30/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.57E-02 O.OOE+OO 1.57E-02 Cs-134 < 1.79E-02 O.OOE+OO 1.79E-02 Cs-137 < 1.78E-02 O.OOE+OO 1.78E-02 Be-7 4.86E-03 7.15E-02 1.31E-01 K-40 <3.82E-01 O.OOE+OO 3.82E-01 Sample ID: 481089 Sample Dates: 7/30/2018. 8/6/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.29E-02 O.OOE+OO 2.29E-02 Cs-134 <2.04E-02 O.OOE+OO 2.04E-02 Cs-137 <1.79E-02 O.OOE+OO 1.79E-02 Be-7 <1.09E-01 O.OOE+OO 1.09E-01 K-40 5.14E-01 2.00E-01 2.14E-01 Sample ID: 481530 Sample Dates : 8/6/2018 -8/13/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.33E-02 O.OOE+OO 2.33E-02 Cs-134 <1 .91E-02 O.OOE+OO 1.91E-02 Cs-137 <1.81E-02 O.OOE+OO 1.81 E-02 Be-7 <1.01 E-01 O.OOE+OO 1.01E-01 K- 40 <3.30E-01 O.OOE+OO 3.30E-01 Sample ID: 481980 Sample Dates: 8/13/2018 -8/20/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.78E-02 O.OOE+OO 1.78E-02 Cs-134 < 1.64E-02 O.OOE+OO 1.64E-02 Cs-137 < 1.28E-02 O.OOE+OO 1.28E-02 Be-7 <8.15E-02 O.OOE+OO 8.15E-02 K-40 2.03E-01 1.44E-01 2.01E-01 Sample ID: 482498 Sample Dates: 8/20/2018 - 8/27/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1.53E-02 O.OOE+OO 1.53E-02 (En ~

Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 19 of 91 Duke Energy Annual Report - Appendix E

-- 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 077 [INDICATOR* SW@ 1 miles]

Sample ID: 482498 Sample Dates: 8/20/2018

8/27/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.SSE-02 O.OOE+OO 1.SSE-02 Cs-137 <1.33E-02 O.OOE+OO 1.33E-02 Be-7 <9.GBE-02 O.OOE+OO 9.GBE-02 K-40 1.76E-01 1.44E-01 2.13E-01 Sample ID: 482823 Sample Dates: 8/27/2018 - 9/4/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1.29E-02 O.OOE+OO 1.29E-02 Cs-134 <1 .23E-02 O.OOE+OO 1.23E-02 Cs-137 <1 .32E-02 0.00E+OO 1.32E-02 Be-7 <8.SSE-02 O.OOE+OO 8.SSE-02 K-40 3.53E-01 1.33E-01 9.98E-02 Sample ID: 483445 Sample Dates: 9/4/2018 -9/10/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.41E-02 O.OOE+OO 2.41 E-02 Cs-134 <1.74E-02 O.OOE+OO 1.74E-02 Cs-137 <1.82E-02 O.OOE+OO 1.82E-02 Be-7 <1.32E-01 O.OOE+OO 1.32E-01 K-40 6.25E-01 2.31E-01 2.36E-01 Sample ID: 484042 Sample Dates: 9/10/2018 - 9/17/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.35E-02 O.OOE+OO 3.35E-02 Cs-134 <1.46E-02 O.OOE+OO 1.46E-02 Cs-137 <1.90E-02 O.OOE+OO 1.90E-02 Be-7 <1.52E-01 O.OOE+OO 1.52E-01 K-40 6.01E-01 1.25E-01 1.84E-01 Sample ID: 484617 Sample Dates : 9/17/2018 - 9/24/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1.79E-02 O.OOE+OO 1.79E-02 Cs-134 <1.86E-02 O.OOE+OO 1.86E-02 Cs-137 <1.48E-02 O.OOE+OO 1.48E-02 Be-7 <1 .23E-01 O.OOE+OO 1.23E-01 K-40 6.62E-01 2.14E-01 1.92E-01 Sample ID: 485042 Sample Dates : 9/24/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.42E-02 O.OOE+OO 2.42E-02 Cs-134 < 1.81E-02 O.OOE+OO 1.81E-02 Cs-137 <1.70E-02 O.OOE+OO 1.70E-02 Be-7 <1.28E-01 O.OOE+OO 1.28E-01 K-40 3.96E-01 1.97E-01 2.52E-01 Sample ID: 485505 Sample Dates: 10/1/2018

10/8/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.32E-02 O.OOE+OO 2.32E-02 Cs-134 < 1.89E-02 O.OOE+OO 1.89E-02 Cs-137 < 1.51 E-02 O.OOE+OO 1.51 E-02 Be-7 < 1.07E-01 O.OOE+OO 1.07E-01 K-40 2.86E-01 1.69E-01 2.27E-01 Sample ID: 486182 Sample Dates: 10/8/2018 -10/15/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.46E-02 O.OOE+OO 2.46E-02 Cs-134 <1.71E-02 O.OOE+OO 1.71E-02 Cs-137 < 1.62E-02 O.OOE+OO 1.62E-02 Be-7 < 1.18E-01 O.OOE+OO 1.18E-01 K-40 4.35E-01 2.19E-01 2.91E-01 Sample ID: 486714 Sample Dates: 10/15/2018 -10/22/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.29E-02 O.OOE+OO 2.29E-02 Cs-134 <1 .72E-02 O.OOE+OO 1.72E-02 Cs-137 <1 .52E-02 O.OOE+OO 1.52E-02 Be-7 <1 .25E-01 O.OOE+OO 1.25E-01 K-40 3.79E-01 1.84E-01 2.27E-01 Sample ID: 487753 Sample Dates: 10/22/2018 -10/29/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.11E-02 O.OOE+OO 2.11 E-02 Cs-134 < 1.68E-02 O.OOE+OO 1.68E-02 Cs-137 < 1.44E-02 O.OOE+OO 1.44E-02 Be-7 < 1.03E-01 O.OOE+OO 1.03E-01 K-40 4 .83E-01 1.96E-01 2.15E-01 Sample ID: 487997 Sample Dates : 10/29/2018 -11/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.0SE-02 O.OOE+OO 2.0SE-02

- EnRad Laboratories

--- ~

Report Generated@ 5/1/201911 :57:36 Duke Energy Annual Report - Appendix E cEn 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 20 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 077 [ INDICATOR - SW @ 1 miles ]

Sample ID: 487997 Sample Dates: 10/29/2018 -11/5/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.57E-02 O.OOE+OO 1.57E-02 Cs-137 <1.46E-02 O.OOE+OO 1.46E-02 Be-7 <1.04E-01 O.OOE+OO 1.04E-01 K-40 6.83E-01 1.93E-01 3.43E-02 Sample ID: 488489 Sample Dates : 11/5/2018 -11/12/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .16E-02 O.OOE+OO 2.16E-02 Cs-134 <1.SOE-02 O.OOE+OO 1.SOE-02 Cs-137 < 1.56E-02 O.OOE+OO 1.56E-02 Be-7 < 1.03E-01 O.OOE+OO 1.03E-01 K-40 4.56E-01 1.SBE-01 3.53E-02 Sample ID: 488868 Sample Dates: 11/12/2018 -11/19/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.38E-02 O.OOE+OO 3.38E-02 Cs-134 < 1.SOE-02 0.00E+OO 1.BOE-02 Cs-137 < 1.95E-02 O.OOE+OO 1.95E-02 Be-7 < 1.26E-01 O.OOE+OO 1.26E-01 K-40 4.28E-01 1.91E-01 2.26E-01 Sample ID: 489165 Sample Dates: 11/19/2018 -11/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.68E-02 0.00E+OO 3.68E-02 Cs-134 <2.13E-02 O.OOE+OO 2.13E-02 Cs-137 < 1.SSE-02 O.OOE+OO 1.SSE-02 Be-7 < 1.22E-01 O.OOE+OO 1.22E-01 K-40 4.48E-01 1.86E-01 2.01E-01 Sample ID: 489747 Sample Dates: 11/26/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2. 1 BE-02 O.OOE+OO 2.18E-02 Cs-134 <1.58E-02 0.00E+OO 1.58E-02 Cs-137 < 1.63E-02 O.OOE+OO 1.63E-02 Be-7 <1.18E-01 0.00E+OO 1.18E-01 K-40 <3.85E-01 O.OOE+OO 3.BSE-01 Sample ID: 490170 Sample Dates: 12/3/2018 -12/10/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.60E-02 O.OOE+OO 3.60E-02 Cs-134 <1.BOE-02 O.OOE+OO 1.BOE-02 Cs-137 <1.42E-02 0.00E+OO 1.42E-02 Be-7 <1.23E-01 O.OOE+OO 1.23E-01 K-40 <4.07E-01 O.OOE+OO 4.07E-01 Sample ID: 490817 Sample Dates: 12/10/2018 -12/18/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.02E-02 O.OOE+OO 3.02E-02 Cs-134 <1.27E-02 O.OOE+OO 1.27E-02 Cs-137 <1.59E-02 O.OOE+OO 1.59E-02 Be-7 <7.63E-02 O.OOE+OO 7.63E-02 K-40 <2.53E-01 O.OOE+OO 2.53E-01 Sample ID: 491192 Sample Dates: 12/18/2018 -12/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.33E-02 O.OOE+OO 3.33E-02 Cs-134 <1 .66E-02 O.OOE+OO 1.66E-02 Cs-137 <1.BOE-02 O.OOE+OO 1.BOE-02 Be-7 <1.06E-01 0.00E+OO 1.06E-01 K-40 5.42E-01 1.96E-01 2.11E-01 Sample ID: 491493 Sample Dates: 12/26/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.76E-02 O.OOE+OO 3.76E-02 Cs-134 <1.74E-02 O.OOE+OO 1.74E-02 Cs-137 <2.12E-02 0.00E+OO 2.12E-02 Be-7 <1.60E-01 O.OOE+OO 1.60E-01 K-40 5.66E-01 2.0SE-01 4.BOE-02 Sample Point 078.1 [ INDICATOR - WSW@ 0.53 miles]

Sample ID: 465659 Sample Dates: 1/2/2018 -1/8/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.69E-02 O.OOE+OO 2.69E-02 Cs- 134 <1.99E-02 O.OOE+OO 1.99E-02 Cs-137 <1.96E-02 O.OOE+OO 1.96E-02 Be-7 <1.42E-01 O.OOE+OO 1.42E-01 K-40 6.84E-01 2.40E-01 2.28E-01 Report Generated@ 5/1/2019 11:57:36 EnRad Laboratories Appendix E - Page 21 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCilm3 Sample Point 078.1 [ INDICATOR - WSW@ 0.53 miles]

Sample ID: 466014 Sample Dates: 1/8/2018 -1/15/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.SSE-02 O.OOE+OO 2.SSE-02 Cs-134 <1.65E-02 O.OOE+OO 1.65E-02 Cs-137 <1.77E-02 O.OOE+OO 1.77E-02 Be-7 <1 .26E-01 O.OOE+OO 1.26E-01 K-40 5.63E-01 2.07E-01 2.18E-01 Sample ID: 466216 Sample Dates: 1/15/2018 -1/22/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.36E-02 0.00E+OO 2.36E-02 Cs-134 <1 .60E-02 O.OOE+OO 1.60E-02 Cs-137 <1 .88E-02 O.OOE+OO 1.88E-02 Be-7 <1 .40E-01 O.OOE+OO 1.40E-01 K-40 5.02E-01 1.65E-01 3.49E-02 Sample ID: 466401 Sample Dates: 1/22/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.62E-02 O.OOE+OO 2.62E-02 Cs- 134 <1.43E-02 O.OOE+OO 1.43E-02 Cs-137 <1.68E-02 O.OOE+OO 1.68E-02 Be-7 <1.21 E-01 O.OOE+OO 1.21E-01 K-40 5.83E-01 1.91E-01 1.48E-01 Sample ID: 466999 Sample Dates: 1/29/2018 - 2/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.14E-02 O.OOE+OO 2.14E-02 Cs-134 <1.82E-02 O.OOE+OO 1.82E-02 Cs-137 <1.SOE-02 O.OOE+OO 1.SOE-02 Be-7 <1 .26E-01 O.OOE+OO 1.26E-01 K-40 5.10E-01 1.96E-01 2.03E-01 Sample ID: 467351 Sample Dates: 2/5/2018 - 2/12/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.24E-02 O.OOE+OO 2.24E-02 Cs-134 <1.84E-02 O.OOE+OO 1.84E-02 Cs-137 <1.98E-02 O.OOE+OO 1.98E-02 Be-7 <1.22E-01 O.OOE+OO 1.22E-01 K-40 6.21E-01 2.04E-01 1.79E-01 Sample ID: 467675 Sample Dates: 2/12/2018 - 2/19/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.32E-02 O.OOE+OO 2.32E-02 Cs-134 <1.61E-02 O.OOE+OO 1.61 E-02 Cs-137 <1.66E-02 O.OOE+OO 1.66E-02 Be-7 <1 .30E-01 O.OOE+OO 1.30E-01 K-40 4.18E-01 1.62E-01 1.30E-01 Sample ID: 468449 Sample Dates: 2/19/2018

2/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.23E-02 O.OOE+OO 2.23E-02 Cs-134 <1.96E-02 O.OOE+OO 1.96E-02 Cs-137 <1.46E-02 O.OOE+OO 1.46E-02 Be-7 <1 .37E-01 O.OOE+OO 1.37E-01 K-40 5.21E-01 1.89E-01 1.79E-01 Sample ID: 468777 Sample Dates: 2/26/2018 - 3/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.16E-02 O.OOE+OO 2.16E-02 Cs-134 <1.81E-02 O.OOE+OO 1.81E-02 Cs-137 <1.93E-02 O.OOE+OO 1.93E-02 Be-7 <1.25E-01 O.OOE+OO 1.25E-01 K-40 5.96E-01 2.23E-01 2.48E-01 Sample ID: 469585 Sample Dates: 3/5/2018 -3/12/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1 .99E-02 O.OOE+OO 1.99E-02 Cs-134 <2.31E-02 O.OOE+OO 2.31 E-02 Cs-137 <1.76E-02 O.OOE+OO 1.76E-02 Be-7 <1 .30E-01 O.OOE+OO 1.30E-01 K-40 5.75E-01 1.94E-01 1.65E-01 Sample ID: 470620 Sample Dates : 3/12/2018 - 3/19/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.41E-02 O.OOE+OO 2.41E-02 Cs-134 <1 .86E-02 O.OOE+OO 1.86E-02 Cs-137 <1.54E-02 O.OOE+OO 1.54E-02 Be-7 <1 .12E-01 O.OOE+OO 1.12E-01 K-40 <4.12E-01 O.OOE+OO 4 .12E-01 (f~ --

Report Generated@ 5/1/201911:57:36 EnRad Laboratories Appendix E - Page 22 of 91 Duke Energy Annual Report - Appendix E __) 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 078.1 [ INDICATOR - WSW@ 0.53 miles]

Sample ID: 471171 Sample Dates: 3/19/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .19E-02 O.OOE+OO 2.19E-02 Cs-134 <1 .53E-02 O.OOE+OO 1.53E-02 Cs-137 <1.98E-02 O.OOE+OO 1.98E-02 Be-7 <1.38E-01 0.00E+OO 1.38E-01 K-40 5.30E-01 2.04E-01 2.19E-01 Sample ID: 471732 Sample Dates : 3/26/2018 - 4/2/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1.97E-02 O.OOE+OO 1.97E-02 Cs-134 <6.84E-03 O.OOE+OO 6.84E-03 Cs-137 <6.16E-03 O.OOE+OO 6.16E-03 Be-7 <5 .32E-02 O.OOE+OO 5.32E-02 K-40 2.30E-01 7 .51 E-02 9.04E-02 Sample ID: 472529 Sample Dates : 4/2/2018 -4/9/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2. 04E-02 O.OOE+OO 2.04E-02 Cs-134 < 1.34E-02 O.OOE+OO 1.34E-02 C s-137 < 1.72E-02 O.OOE+OO 1.72E-02 Be-7 2.69E-02 8.16E-02 1.43E-01 K-40 3.60E-01 1.75E-01 2.11E-01 Sample ID: 472998 Sample Dates: 4/9/2018 -4/16/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.62E-02 O.OOE+OO 2.62E-02 Cs-134 <2.07E-02 O.OOE+OO 2.07E-02 Cs- 137 <1 .66E-02 O.OOE+OO 1.66E-02 Be-7 <1.35E-01 O.OOE+OO 1.35E-01 K-40 4 .64E-01 1.86E-01 1.94E-01 Sample ID: 473279 Sample Dates : 4/16/2018 - 4/23/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.72E-02 O.OOE+OO 2.72E-02 C~-134 < 1.64E-02 O.OOE+OO 1.64E-02 Cs-137 < 1.BBE-02 O.OOE+OO 1.BBE-02 Be-7 <1 .35E-01 O.OOE+OO 1.35E-01 K-40 3.17E-01 1.68E-01 2.12E-01 Sample ID: 474167 Sample Dates : 5/1/2018 - 5nt2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.39E-02 O.OOE+OO 2.39E-02 Cs-134 < 1.89E-02 O.OOE+OO 1.89E-02 Cs-137 <2 .22E-02 O.OOE+OO 2.22E-02 Be-7 < 1.41 E-01 O.OOE+OO 1.41E-01 K-40 6.69E-01 2.54E-01 2.71E-01 Sample ID: 474545 Sample Dates : 5nt2018 - 5/14/2018 Nuclide Activity 2 Sigma Error MDA 1-1 31 <2.0BE-02 O.OOE+OO 2.0BE-02 Cs-134 < 1.56E-02 O.OOE+OO 1.56E-02 Cs-137 < 1.SBE-02 O.OOE+OO 1.SBE-02 Be-7 <1 .21E-01 O.OOE+OO 1.21E-01 K-40 5.28E-01 1.99E-01 2.00E-01 Sample ID: 474912 Sample Dates: 5/14/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .26E-02 O.OOE+OO 2.26E-02 Cs-134 <1 .SBE-02 O.OOE+OO 1.SBE-02 Cs- 137 <1 .81E-02 O.OOE+OO 1.81E-02 Be-7 <1.01 E-01 O.OOE+OO 1.01E-01 K-40 <3 .93E-01 O.OOE+OO 3.93E-01 Sample ID: 475232 Sample Dates: 5/21/2018 - 5/29/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1 .63E-02 O.OOE+OO 1.63E-02 Cs- 134 <1 .SSE-02 O.OOE+OO 1.SSE-02 Cs-137 <1 .15E-02 O.OOE+OO 1.15E-02 Be-7 <9 .99E-02 O.OOE+OO 9.99E-02 K-40 3.57E-01 1.61E-01 1.86E-01 Sample ID: 475553 Sample Dates : 5/29/2018 - 6/4/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.59E-02 O.OOE+OO 2.59E-02 Cs-134 <2.16E-02 O.OOE+OO 2.16E-02 Cs-137 <2.23E-02 O.OOE+OO 2.23E-02 Be-7 <1 .14E-01 O.OOE+OO 1.14E-01 K-40 7.42E-01 2.31 E-01 1.66E-01 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 23 of 91 Duke Energy Annual Report -Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report- 2018 {Appendix E)

Media Type: . AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 078.1 [ INDICATOR - WSW@ 0.53 miles J Sample ID: 476378 Sample Dates: 6/4/2018. 6/11/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1 .98E-02 O.OOE+OO 1.98E-02 Cs-134 < 1.75E-02 O.OOE+OO 1.75E-02 Cs-137 < 1.84E-02 O.OOE+OO 1.84E-02 Be-7 < 1.27E-01 O.OOE+OO 1.27E-01 K-40 <4.29E-01 O.OOE+OO 4.29E-01 Sample ID: 477398 Sample Dates: 6/11/2018. 6/18/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.SSE-02 O.OOE+OO 2.SSE-02 Cs-134 <1 .85E-02 O.OOE+OO 1.85E-02 Cs-137 < 1.79E-02 O.OOE+OO 1.79E-02 Be-7 < 1.16E-01 O.OOE+OO 1.16E-01 K-40 5.27E-01 1.72E-01 3.57E-02 Sample ID: 478124 Sample Dates: 6/18/2018 - 6/25/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.44E-02 O.OOE+OO 2.44E-02 Cs-134 <1 .54E-02 O.OOE+OO 1.54E-02 Cs- 137 <1 .66E-02 O.OOE+OO 1.66E-02 Be-7 <1 .11E-01 O.OOE+OO 1.11E-01 K-40 5.48E-01 2.23E-01 2.64E-01 Sample ID: 478440 Sample Dates: 6/25/2018 - 7/2/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.21E-02 O.OOE+OO 2.21E-02 Cs-134 <1 .92E-02 O.OOE+OO 1.92E-02 Cs-137 <1 .74E-02 O.OOE+OO 1.74E-02 Be-7 <1 .29E-01 O.OOE+OO 1.29E-01 K-40 5.34E-01 1.96E-01 1.92E-01 Sample ID: 478813 Sample Dates : 7/2/2018 . 7/9/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <2.33E-02 O.~OE+OO 2.33E-02 Cs-134 <1 .93E-02 O.OOE+OO 1.93E-02 Cs-137 <1 .79E-02 O.OOE+OO 1.79E-02 Be-7 <1 .15E-01 O.OOE+OO 1.15E-01 K-40 5.94E-0 1 2.00E-01 1.76E-01 Sample ID: 479219 Sample Dates: 7/9/2018 - 7/16/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.43E-02 O.OOE+OO 2.43E-02 Cs-134 <1 .83E-02 O.OOE+OO 1.83E-02 Cs-137 <1 .51E-02 O.OOE+OO 1.51 E-02 Be-7 <1.41E-01 O.OOE+OO 1.41E-01 K-40 <3.SOE-01 O.OOE+OO 3.SOE-0 1 Sample ID: 479900 Sample Dates: 7/16/2018 . 7/23/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.06E-02 O.OOE+OO 2.06E-02 Cs-134 < 1.62E-02 O.OOE+OO 1.62E-02 Cs-137 <1.66E-02 O.OOE+OO 1.66E-02 Be-7 < 1.31E-01 O.OOE+OO 1.31 E-01 K- 40 4.57E-01 2.03E-01 2.44E-01 Sample ID: 480263 Sample Dates : 7/23/2018. 7/30/2018 Nuclide Activity 2 Sigma Error MDA 1- 13 1 <2.23E-02 O.OOE+OO 2.23E-02 Cs-134 < 1.86E-02 O.OOE+OO 1.86E-02 Cs-137 < 1.78E-02 O.OOE+OO 1.78E-02 Be-7 < 1.17E-01 O.OOE+OO 1.17E-01 K- 40 3.66E-01 1.66E-01 1.81 E-01 Sample ID: 481090 Sample Dates: 7/30/2018 - 8/6/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <2.30E-02 O.OOE+OO 2.30E-02 Cs-134 < 1.52E-02 O.OOE+OO 1.52E-02 Cs-137 <1.74E-02 O.OOE+OO 1.74E-02 Be-7 <1.09E-01 O.OOE+OO 1.09E-01 K-40 4.71E-01 2.15E-01 2.71 E-01 Sample ID: 481531 Sample Dates: 8/6/2018

8/13/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.51E-02 O.OOE+OO 2.51E-02 Cs-134 <2.13E-02 O.OOE+OO 2.13E-02 Cs-137 <1.57E-02 O.OOE+OO 1.57E-02 Be-7 <1.27E-01 O.OOE+OO 1.27E-01 K-40 2.95E-01 1.63E-01 2.0SE-01 Report Generated@ 5/1/2019 11:57:36 EnRad Laboratories Appendix E - Page 24 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 078.1 [ INDICATOR-WSW@0.53 miles J Sample ID: 481981 Sample Dates: 8/13/2018 -8/20/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1.92E-02 O.OOE+OO 1.92E-02 Cs-134 <9.67E-03 O.OOE+OO 9.67E-03 Cs-137 <1.49E-02 O.OOE+OO 1.49E-02 Be-7 <5.63E-02 O.OOE+OO 5.63E-02 K-40 <3.03E-01 O.OOE+OO 3.03E-01 Sample ID: 482499 Sample Dates: 8/20/2018 - 8/27/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.46E-02 O.OOE+OO 1.46E-02 Cs-134 < 1.68E-02 O.OOE+OO 1.68E-02 Cs-137 < 1.56E-02 0.00E+OO 1.56E-02 Be-7 <9.SOE- 02 O.OOE+OO 9.SOE-02 K-40 2.65E-01 1.46E-01 1.77E-01 Sample ID: 482824 Sample Dates: 8/27/2018 - 9/4/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.51 E-02 O.OOE+OO 1.51 E-02 Cs-134 < 1.65E-02 O.OOE+OO 1.65E-02 Cs-137 <1.32E-02 0.00E+OO 1.32E-02 Be-7 <8.48E-02 O.OOE+OO 8.48E-02 K-40 3.09E-01 1.28E-01 1.07E-01 Sample ID: 483446 Sample Dates: 9/4/2018 -9/10/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.BSE-02 0.00E+OO 2.85E-02 Cs-134 <2.46E-02 O.OOE+OO 2.46E-02 Cs-137 <1.88E-02 O.OOE+OO 1.88E-02 Be-7 <1 .1 7E-01 O.OOE+OO 1.17E-01 K-40 6 .07E-01 2.27E-01 2.31E-01 Sample ID: 484043 Sample Dates: 9/10/2018 - 9/17/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3 .42E-02 O.OOE+OO 3.42E-02 Cs-134 < 1.96E-02 O.OOE+OO 1.96E-02 Cs-137 < 1.31E-02 O.OOE+OO 1.31 E-02 Be-7 < 1.21E-01 0 .00E+OO 1.21E-01 K-40 3.59E-01 1.SOE-01 1.63E-01 Sample ID: 484618 Sample Dates: 9/17/2018 -9/24/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.27E-02 O.OOE+OO 2.27E-02 Cs-134 <1.44E-02 O.OOE+OO 1.44E-02 Cs-137 < 1.79E-02 O.OOE+OO 1.79E-02 Be-7 <1. 18E-01 O.OOE+OO 1.18E-01 K-40 4.SSE-01 1.81E-01 1.84E-01 Sample ID: 485043 Sample Dates: 9/24/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA 1-1 31 <2. 93E-02 O.OOE+OO 2.93E-02 Cs-134 < 1.87E-02 O.OOE+OO 1.87E-02 Cs-137 < 1.79E-02 O.OOE+OO 1.79E-02 Be-7 < 1.19E-01 O.OOE+OO 1.19E-01 K-40 4.16E-01 1.SOE-01 1.26E-01 Sample ID: 485506 Sample Dates: 10/1/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.73E-02 O.OOE+OO 1.73E-02 Cs-134 <1.77E-02 O.OOE+OO 1.77E-02 Cs-137 < 1.66E-02 O.OOE+OO 1.66E-02 Be-7 < 1.07E-01 0 .00E+OO 1.07E-01 K-40 5.28E-01 2.00E- 01 2.12E-01 Sample ID: 486183 Sample Dates : 10/8/2018 -10/15/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .12E-02 O.OOE+OO 2.12E-02 Cs-134 <1 .70E-02 O.OOE+OO 1.70E-02 Cs-137 <1.51 E-02 O.OOE+OO 1.51 E-02 Be-7 <1.18E-01 0.00E+OO 1.18E-01 K-40 5.09E-01 1.91E-01 1.85E-01 Sample ID: 486715 Sample Dates: 10/15/2018 -10/22/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .51 E-02 O.OOE+OO 2.51E-02 Cs-134 < 1.65E-02 O.OOE+OO 1.65E-02 Cs-137 < 1.52E-02 O.OOE+OO 1.52E-02 Be-7 < 1.16E-01 O.OOE+OO 1.16E-01 K-40 4 .70E-01 1.82E-01 1.82E-01 (f~ --

EnRad Laboratories Report Generated @ 5/1/2019 11 :57:36 - Appendix E - Page 25 of 91 Duke Energy Annual Report -Appendix E _) 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 078.1 [ INDICATOR - WSW@ 0.53 miles J Sample ID: 487754 Sample Dates: 10/22/2018 -10/29/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .30E-02 O.OOE+OO 2.30E-02 Cs- 134 <1.53E-02 O.OOE+OO 1.53E-02 Cs-137 <1.71 E-02 O.OOE+OO 1.71 E-02 Be-7 <1.10E-01 O.OOE+OO 1. 10E-01 K-40 6.1 OE-01 2.07E-01 1.91E-01 Sample ID: 487998 Sample Dates: 10/29/2018 -11/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.06E-02 O.OOE+OO 2.06E-02 Cs-134 < 1.71E-02 O.OOE+OO 1.71E-02 Cs-137 < 1.72E-02 O.OOE+OO 1.72E-02 Be-7 < 1.04E-01 0.00E+OO 1.04E-01 K-40 5.09E-01 1.75E-01 1.26E-01 Sample ID: 488490 Sample Dates : 11/5/2018 -11/12/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1. 99E-02 O.OOE+OO 1.99E-02 Cs-134 <2. 02E-02 O.OOE+OO 2.02E-02 Cs-137 <1.91E-02 O.OOE+OO 1.91E-02 Be-7 <1.26E-01 0.00E+OO 1.26E-01 K- 40 3.93E-01 1.77E-01 1.99E-01 Sample ID: 488869 Sample Dates: 11/12/2018 -11/19/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.44E-02 O.OOE+OO 3.44E-02 Cs- 134 <1.59E-02 0.00E+OO 1.59E-02 Cs-137 < 1.77E-02 O.OOE+OO 1.77E-02 Be-7 <1 .38E-01 O.OOE+OO 1.38E-01 K-40 4.31 E-01 1.98E-01 2.44E-01 Sample ID: 489166 Sample Dates: 11/19/2018 -11/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.08E-02 O.OOE+OO 2.08E-02 Cs-134 < 1.68E-02 O.OOE+OO 1.68E-02 Cs-137 < 1.31 E-02 O.OOE+OO 1.31E-02 Be-7 < 1.39E-01 0.00E+OO 1.39E-01 K-40 4.79E-01 1.98E-01 2.21E-01 Sample ID: 489748 Sample Dates: 11/26/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.15E-02 O.OOE+OO 2.15E-02 Cs- 134 <1.58E-02 O.OOE+OO 1.58E-02 Cs- 137 <1.82E-02 0.00E+OO 1.82E-02 Be-7 <1.21E-01 O.OOE+OO 1.21E-01 K-40 <3.69E-01 O.OOE+OO 3.69E-01 Sample ID: 490171 Sample Dates: 12/3/2018 -12/10/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.76E-02 O.OOE+OO 3.76E-02 Cs-134 < 1.67E-02 0.00E+OO 1.67E-02 Cs- 137 < 1.69E-02 O.OOE+OO 1.69E-02 Be-7 < 1.26E-01 O.OOE+OO 1.26E-01 K-40 <3.20E-01 O.OOE+OO 3.20E-01 Sample ID: 490818 Sample Dates: 12/10/2018 -12/18/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.48E-02 O.OOE+OO 2.48E-02 Cs-134 < 1.43E-02 O.OOE+OO 1.43E-02 Cs-137 < 1.04E-02 0.00E+OO 1.04E-02 Be-7 <7.75E-02 O.OOE+OO 7.75E-02 K-40 <2.7 1E-01 0.00E+OO 2.71 E-01 Sample ID: 491193 Sample Dates : 12/18/2018 - 12/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.88E-02 O.OOE+OO 2.88E-02 Cs-134 <1.35E-02 O.OOE+OO 1.35E-02 Cs-137 <1.49E-02 O.OOE+OO 1.49E-02 Be-7 <1.24E-01 0.00E+OO 1.24E-01 K-40 5.00E-01 1.97E-01 2.30E-01 Sample ID: 491494 Sample Dates: 12/26/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <4.93E-02 O.OOE+OO 4.93E-02 Cs- 134 <2.41E-02 O.OOE+OO 2.41 E-02 Cs-137 <2.20E-02 O.OOE+OO 2.20E-02 Be-7 <1 .99E-01 O.OOE+OO 1.99E-01 K-40 5.43E-01 2.40E-01 2.66E-01 Report Generated@ 5/1/2019 11 :57:36 Duke Energy Annual Report - Appendix E ---

En __)

EnRad Laboratories 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 26 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 079 [ INDICATOR - NE@ 0.56 miles]

Sample ID: 465660 Sample Dates: 1/2/2018 -1/8/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.82E-02 0.00E+OO 2.82E-02 Cs-134 <2.23E-02 O.OOE+OO 2.23E-02 Cs-137 <1.90E-02 O.OOE+OO 1.90E-02 Be-7 <1.68E-01 O.OOE+OO 1.68E-01 K-40 6.04E-01 2.25E-01 2.17E-01 Sample ID: 466015 Sample Dates : 1/8/2018 -1/15/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.77E-02 O.OOE+OO 2.77E-02 Cs-134 <1.58E-02 0.00E+OO 1.58E-02 Cs-137 <1.72E-02 O.OOE+OO 1.72E-02 Be-7 < 1.21 E-01 O.OOE+OO 1.21E-01 K-40 5.53E-01 1.89E-01 1.57E-01 Sample ID: 466217 Sample Dates: 1/15/2018 -1/22/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.54E-02 O.OOE+OO 2.54E-02 Cs-134 <1.99E-02 O.OOE+OO 1.99E-02 Cs- 137 <1.84E-02 O.OOE+OO 1.84E-02 Be-7 <1.32E-01 0.00E+OO 1.32E-01 K-40 5.53E-01 1.85E-01 1.38E-01 Sample ID: 466402 Sample Dates: 1/22/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.27E-02 O.OOE+OO 2.27E-02 Cs-134 < 1.90E-02 O.OOE+OO 1.90E-02 Cs-137 < 1.81 E-02 O.OOE+OO 1.81 E-02 Be-7 < 1.39E-0 1 0.00E+OO 1.39E-01 K-40 5.65E-01 1.99E-01 1.89E-01 Sample ID: 467000 Sample Dates : 1/29/2018 - 2/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.20E-02 O.OOE+OO 2.20E-02 Cs-134 <1.17E-02 O.OOE+OO 1.17E-02 Cs-137 <1 .91 E-02 O.OOE+OO 1.91E-02 Be-7 < 1.46E-01 O.OOE+OO 1.46E-01 K-40 6.61 E-01 2.16E-01 1.95E-01 Sample ID: 467352 Sample Dates: 2/5/2018 - 2/12/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.24E-02 O.OOE+OO 2.24E-02 Cs-134 <1.58E-02 O.OOE+OO 1.58E-02 Cs-137 < 1.77E-02 O.OOE+OO 1.77E-02 Be-7 < 1.16E-01 0.00E+OO 1.16E-01 K-40 5.56E-01 2.0SE-01 2.15E-01 Sample ID: 467676 Sample Dates : 2/12/2018 - 2/19/2018 Nuclide Activity 2 Sigma Error MDA 1- 13 1 <2.28E-0 2 O.OOE+OO 2.28E-02 Cs-134 <2 .01E-0 2 O.OOE+OO 2.01E-02 Cs-137 < 1.66E-02 O.OOE+OO 1.66E-02 Be-7 <9.18E-02 O.OOE+OO 9.18E-02 K-40 5.65E-01 1.92E-01 1.59E-01 Sample ID: 468450 Sample Dates : 2/19/2018 - 2/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .28E-02 O.OOE+OO 2.28E-02 Cs-1 34 < 1.72E-02 O.OOE+OO 1.72E-02 Cs-1 37 < 1.52E-02 0.00E+OO 1.52E-02 Be-7 < 1.15E-01 O.OOE+OO 1.15E-01 K-40 4.95E-01 1.85E-01 1.BOE-01 Sample ID: 468778 Sample Dates: 2/26/2018 - 3/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .87E-02 O.OOE+OO 2.87E-02 Cs-134 <1.45E-02 O.OOE+OO 1.45E-02 Cs-137 <1.80E-02 O.OOE+OO 1.80E-02 Be-7 <1.20E-01 O.OOE+OO 1.20E-01 K-40 4.18E-01 1.86E-01 2.16E-01 Sample ID: 469586 Sample Dates : 3/5/2018 - 3/12/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.30E-02 O.OOE+OO 2.30E-02 Cs-134 < 1.90E-02 O.OOE+OO 1.90E-02 Cs- 137 <1.46E-02 O.OOE+OO 1.46E-02 Be-7 <9.97E-02 0.00E+OO 9.97E-02 K-40 <3 .23E-01 O.OOE+OO 3.23E-01 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 27 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report- 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 079 [ INDICATOR

NE @ 0.56 miles]

Sample ID: 470621 Sample Dates: 3/12/2018

3/19/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.15E-02 O.OOE+OO 2.15E-02 Cs-134 <1.43E-02 O.OOE+OO 1.43E-02 Cs-137 <1.91E-02 0.00E+OO 1.91E-02 Be-7 <1.21E-01 O.OOE+OO 1.21E-01 K-40 5.00E-01 1.86E-01 1.77E-01 Sample ID: 471172 Sample Dates: 3/19/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.52E-02 O.OOE+OO 2.52E-02 Cs-134 <2.12E-02 O.OOE+OO 2.12E-02 Cs-137 <1.98E-02 O.OOE+OO 1.98E-02 Be-7 <1.17E-01 O.OOE+OO 1.17E-01 K- 40 6.35E-01 2.09E-01 1.83E-01 Sample ID: 471733 Sample Dates : 3/26/2018 - 4/2/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.01E-02 O.OOE+OO 2.01E-02 Cs-134 < 1.26E-02 O.OOE+OO 1.26E-02 Cs-137 < 1.80E-02 O.OOE+OO 1.80E-02 Be-7 < 1.24E-01 O.OOE+OO 1.24E-01 K-40 4.69E-01 2.21E-01 2.87E-01 Sample ID: 472530 Sample Dates : 4/2/2018 -4/9/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.49E-02 O.OOE+OO 2.49E-02 Cs-134 <1.72E-02 O.OOE+OO 1.72E-02 Cs-137 <1.63E-02 O.OOE+OO 1.63E-02 Be-7 <9.28E-02 O.OOE+OO 9.28E-02 K- 40 4.69E-01 1.85E-01 1.91E-01 Sample ID: 472999 Sample Dates : 4/9/2018 -4/16/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.26E-02 O.OOE+OO 2.26E-02 Cs-134 <1 .76E-02 O.OOE+OO 1.76E-02 Cs-137 <1.32E-02 O.OOE+OO 1.32E-02 Be-7 < 1.21E-01 O.OOE+OO 1.21E-01 K-40 2.01E-01 1.51E-01 2.17E-01 Sample ID: 473280 Sample Dates: 4/16/2018 -4/23/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.52E-02 O.OOE+OO 2.52E-02 Cs-134 <2.00E-02 O.OOE+OO 2.00E-02 Cs-137 <1.56E-02 O.OOE+OO 1.56E-02 Be-7 <1 .18E-01 O.OOE+OO 1.18E-01 K-40 5.14E-01 1.66E-01 3.40E-02 Sample ID: 473652 Sample Dates : 4/23/2018 - 4/30/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.63E-02 O.OOE+OO 2.63E-02 C s- 134 <1 .62E-02 0.00E+OO 1.62E-02 C s-137 < 1.77E-02 O.OOE+OO 1.77E-02 Be-7 < 1.11E-01 O.OOE+OO 1.11E-01 K-40 4.58E-01 2.12E-01 2.68E-01 Sample ID: 474168 Sample Dates: 4/30/2018 - 5/7/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.41E-02 O.OOE+OO 2.41E-02 Cs-134 < 1.91E-02 O.OOE+OO 1.91E-02 Cs-137 < 1.68E-02 O.OOE+OO 1.68E-02 Be-7 < 1.11E-01 O.OOE+OO 1.11E-01 K-40 3.86E-01 1.92E-01 2.45E-01 Sample ID: 474546 Sample Dates: 5n/2018 - 5/14/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.29E-02 O.OOE+OO 2.29E-02 Cs-134 < 1.80E-02 0.00E+OO 1.80E-02 Cs-137 < 1.96E-02 O.OOE+OO 1.96E-02 Be-7 <1.26E-01 O.OOE+OO 1.26E-01 K-40 3.70E-01 2.12E-01 2.96E-01 Sample ID: 474913 Sample Dates : 5/14/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.30E-02 O.OOE+OO 2.30E-02 Cs-134 < 1.85E-02 O.OOE+OO 1.85E-02 Cs-137 < 1.95E-02 O.OOE+OO 1.95E-02 Be-7 < 1.21 E-01 O.OOE+OO 1.21E-01 K-40 4.96E-01 1.96E-01 2.12E-01 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 28 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOiODINE Concentration (Activity): pCi/m3 Sample Point 079 [ INDICATOR

NE @ 0.56 miles ]

Sample ID: 475233 Sample Oates: 5/21/2018

5/29/2018 Nuclide Activity 2 Sigma Error MOA 1-131 <2.03E-02 O.OOE+OO 2.03E-02 Cs-134 <1.51 E-02 O.OOE+OO 1.51 E-02 Cs-137 <1.70E-02 O.OOE+OO 1.70E-02 Be-7 <1.0BE-01 O.OOE+OO 1.0BE-01 K-40 3.71 E-01 1.49E-01 1.42E-01 Sample ID: 475554 Sample Oates: 5/29/2018 - 6/4/2018 Nuclide Activity 2 Sigma Error MOA 1-131 <2.61 E-02 O.OOE+OO 2.61E-02 Cs-134 <2.26E-02 O.OOE+OO 2.26E-02 Cs-137 <1.92E-02 O.OOE+OO 1.92E-02 Be-7 <1 .62E-01 O.OOE+OO 1.62E-01 K-40 5.93E-01 2.2BE-01 2.37E-01 Sample ID: 476379 Sample Oates: 6/4/2018 - 6/11/2018 Nuclide Activity 2 Sigma Error MOA 1-131 <2.23E-02 O.OOE+OO 2.23E-02 Cs-134 <1 .99E-02 O.OOE+OO 1.99E-02 Cs-137 <1.84E-02 O.OOE+OO 1.84E-02 Be-7 <1 .12E-01 O.OOE+OO 1.12E-01 K-40 <4.00E-01 0.00E+OO 4.00E-01 Sample ID: 477399 Sample Oates: 6/11/2018 - 6/18/2018 Nuclide Activity 2 Sigma Error MOA 1-131 <2.38E-02 O.OOE+OO 2.38E-02 Cs-134 <1 .59E-02 O.OOE+OO 1.59E-02 Cs-137 <2.12E-02 O.OOE+OO 2.12E-02 Be-7 <1.17E-01 O.OOE+OO 1.17E-01 K-40 4.19E-01 1.91E-01 2.16E-01 Sample ID: 478125 Sample Oates: 6/18/2018 - 6/25/2018 Nuclide Activity 2 Sigma Error MOA 1-131 <2 .25E-02 O.OOE+OO 2.25E-02 Cs-134 < 1.90E-02 O.OOE+OO 1.90E-02 Cs-137 < 1.30E-02 O.OOE+OO 1.30E-02 Be-7 <1.18E-01 O.OOE+OO 1.1BE-01 K-40 5.38E-01 2.03E-01 2.12E-01 Sample 10: 478441 Sample Dates: 6/25/2018 - 7/2/2018 Nuclide Activity 2 Sigma Error MOA 1-131 <2.11E-02 O.OOE+OO 2.11 E-02 Cs-134 <2.09E-02 O.OOE+OO 2.09E-02 Cs-137 <1.42E-02 O.OOE+OO 1.42E-02 Be-7 <1 .15E-01 O.OOE+OO 1.15E-01 K-40 6.40E-01 2.12E-01 1.94E-01 Sample ID: 478814 Sample Oates: 7/2/2018 - 7/9/2018 Nuclide Activity 2 Sigma Error MOA 1-131 <2. 37E-02 0.00E+OO 2.37E-02 Cs-134 < 1.BOE-02 O.OOE+OO 1.BOE-02 Cs-137 <1.79E-02 0.00E+OO 1.79E-02 Be-7 <1.30E-01 O.OOE+OO 1.30E-01 K-40 3.90E-01 1.92E-01 2 .42E-01 Sample 10: 479220 Sample Oates: 7/9/2018 - 7/16/2018 Nuclide Activity 2 Sigma Error MOA 1-131 <2.04E-02 O.OOE+OO 2.04E-02 Cs- 134 < 1.77E-02 O.OOE+OO 1.77E-02 Cs-137 < 1.75E-02 O.OOE+OO 1.75E-02 Be-7 < 1.07E-01 O.OOE+OO 1.07E-01 K-40 4 .87E-01 1.BBE-01 1.94E-01 Sample 10: 479901 Sample Dates: 7/16/2018 - 7/23/2018 Nuclide Activity 2 Sigma Error MOA 1-131 <2.24E-02 O.OOE+OO 2.24E-02 Cs-134 <1.62E-02 O.OOE+OO 1.62E-02 Cs-137 <1.67E-02 O.OOE+OO 1.67E-02 Be-7 <1 .37E-01 O.OOE+OO 1.37E-01 K-40 4.98E-01 1.76E-01 1.32E-01 Sample ID: 480264 Sample Oates: 7/23/2018 - 7/30/2018 Nuclide Activity 2 Sigma Error MOA 1-131 < 1.84E-02 O.OOE+OO 1.84E-02 Cs-134 < 1.79E-02 O.OOE+OO 1.79E-02 Cs-137 <1.07E-02 O.OOE+OO 1.07E-02 Be-7 <1.26E-01 O.OOE+OO 1.26E-01 K-40 6.64E-01 1.91E-01 3.46E-02 Report Generated@ 5/1/201911:57:36 EnRad Laboratories Appendix E - Page 29 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 079 [ INDICATOR - NE@ 0.56 miles]

Sample ID: 481091 Sample Dates : 7/30/2018 - 8/6/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.20E-02 O.OOE+OO 2.20E-02 Cs-134 <1 .52E-02 O.OOE+OO 1.52E-02 Cs-137 <1 .54E-02 O.OOE+OO 1.54E-02 Be-7 <1.43E-01 O.OOE+OO 1.43E-01 K-40 5.97E-01 2.17E-01 2.31E-01 Sample ID: 481532 Sample Dates : 8/6/2018 - 8/13/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.70E-02 O.OOE+OO 2.70E-02 C s-134 < 1.62E-02 O.OOE+OO 1.62E-02 C s-1 37 < 1.74E-02 O.OOE+OO 1.74E-02 Be-7 < 1.04E-01 O.OOE+OO 1.04E-01 K-40 5.21 E-01 2.0SE-01 2. 30E-01 Sample ID: 481982 Sample Dates: 8/13/2018 - 8/20/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.37 E-02 O.OOE+OO 2.37E-02 C s-134 < 1.BSE-02 O.OOE+OO 1.BSE-02 Cs- 137 < 1.84E-02 O.OOE+OO 1.84E-02 Be-7 < 1.17E-01 O.OOE+OO 1.17E-01 K-40 1.62E-01 1.47E-01 2.22E-01 Sample ID: 482500 Sample Dates: 8/20/2018 - 8/27/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1.40E-02 O.OOE+OO 1.40E-02 Cs-134 <1 .28E-02 O.OOE+OO 1.28E-02 Cs-137 <1 .47E-02 O.OOE+OO 1.47E-02 Be-7 <6.87E-02 O.OOE+OO 6.87E-02 K-40 2.29E-01 1.35E-01 1.71 E-01 Sample ID: 482825 Sample Dates : 8/27/2018 - 9/4/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.49E-02 O.OOE+OO 1.49E-02 Cs-134 < 1.SOE-02 O.OOE+OO 1.SOE-02 Cs-137 <1.03E-02 O.OOE+OO 1.03E-02 Be-7 <7.SBE-02 O.OOE+OO 7 .SBE-02 K-40 <2.53E-01 O.OOE+OO 2. 53E-01 Sample ID: 483447 Sample Dates : 9/4/2018 - 9/10/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.SOE-02 O.OOE+OO 2.SOE-02 Cs- 134 <2.13E-02 O.OOE+OO 2.13E-02 Cs-137 < 1.94E-02 O.OOE+OO 1.94E-02 Be-7 < 1.42E-01 O.OOE+OO 1.42E-01 K-40 <4.33E-01 O.OOE+OO 4.33E-0 1 Sample ID: 484044 Sample Dates: 9/10/2018 - 9/17/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <3 .10E-02 O.OOE+OO 3.10E-02 C s-134 < 1.46E-02 O.OOE+OO 1.46E-02 C s-137 < 1.SSE-02 O.OOE+OO 1.SSE-02 Be-7 < 1.14E-01 O.OOE+OO 1.14E-01 K-40 3.46E-01 1.81E-01 2.30E-01 Sample ID: 484619 Sample Dates : 9/17/2018 - 9/24/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.07E-02 O.OOE+OO 2.07E-02 Cs- 134 < 1.74E-02 O.OOE+OO 1.74E-02 Cs-137 < 1.42E-02 O.OOE+OO 1.42E-02 Be-7 <9.76E-02 O.OOE+OO 9.76E-02 K-40 2.72E-01 1.77E-01 2.SOE-01 Sample ID: 485044 Sample Dates: 9/24/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.36E-02 O.OOE+OO 2.36E-02 Cs-134 <1 .92E-02 O.OOE+OO 1.92E-02 Cs-137 <2.04E-02 O.OOE+OO 2.04E-02 Be-7 <1 .30E-01 O.OOE+OO 1.30E-01 K-40 4.12E-01 1.75E-01 1.BSE-0 1 Sample ID: 485507 Sample Dates: 10/1/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 < 1.99E-02 O.OOE+OO 1.99E-02 C s-134 < 1.33E-02 O.OOE+OO 1.33E-02 Cs-137 <1 .62E-02 O.OOE+OO 1.62E-02 Be-7 <9.29E-02 O.OOE+OO 9.29E-02 K-40 2.35E-01 1.77E-01 2.62E-01 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 30 of 91 Duke Energy Annual Report - Appendix E (~ _) 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 079 [ INDICATOR - NE @ 0.56 miles ]

Sample ID: 486184 Sample Dates: 10/8/2018 -10/15/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.60E-02 0.00E+OO 2.60E-02 Cs-134 <1.90E-02 O.OOE+OO 1.90E-02 Cs-137 <2.16E-02 O.OOE+OO 2.16E-02 Be-7 <1.08E-01 O.OOE+OO 1.0SE-01 K-40 5.94E-01 2.19E-01 2.36E-01 Sample ID: 486716 Sample Dates: 10/15/2018 -10/22/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .52E-02 O.OOE+OO 2.52E-02 Cs-134 <2.13E-02 0.00E+OO 2.13E-02 Cs-137 < 1.63E-02 O.OOE+OO 1.63E-02 Be-7 < 1.13E-01 O.OOE+OO 1.13E-01 K-40 2.69E-01 1.59E-01 2.09E-01 Sample ID: 487755 Sample Dates: 10/22/2018 -10/29/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .40E-02 O.OOE+OO 2.40E-02 Cs-134 <1 .94E-02 O.OOE+OO 1.94E-02 Cs-137 <1.49E-02 O.OOE+OO 1.49E-02 Be-7 <1 .19E-01 0.00E+OO 1.19E-01 K-40 5.81 E-01 1.79E-01 3.SOE-02 Sample ID: 487999 Sample Dates: 10/29/2018 -11/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.06E-02 O.OOE+OO 2.06E-02 Cs-134 <1.7BE-02 O.OOE+OO 1.78E-02 Cs-137 <1.81E-02 O.OOE+OO 1.81E-02 Be-7 <1 .29E-01 O.OOE+OO 1.29E-01 K-40 5.01 E-01 1.B9E-01 1.B9E-01 Sample ID: 488491 Sample Dates: 11/5/2018 -11/12/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.54E-02 O.OOE+OO 2 .54E-02 Cs-134 < 1.46E-02 O.OOE+OO 1.46E-02 Cs-137 <1.67E-02 O.OOE+OO 1.67E-02 Be-7 < 1.25E-01 O.OOE+OO 1.25E-01 K-40 3. 91E-01 1.97E-01 2.52E-01 Sample ID: 488870 Sample Dates: 11/12/2018 -11/19/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <3.22E-02 O.OOE+OO 3.22E-02 Cs-134 < 1.44E-02 O.OOE+OO 1.44E-02 Cs-137 < 1.73E-02 O.OOE+OO 1.73E-02 Be-7 < 1.SOE-01 O.OOE+OO 1.SOE-01 K-40 4 .SSE-01 1.94E-01 2.25E-01 Sample ID: 489167 Sample Dates: 11/19/2018 -11/26/2018 Nuclide Activity 2 Sigma Error MDA 1-1 3 1 <2.45E-02 O.OOE+OO 2.45E-02 C s-134 < 1.61 E-02 0.00E+OO 1.61 E-02 Cs-137 <1.71 E-02 O.OOE+OO 1.71E-02 Be-7 <1 .17E-01 O.OOE+OO 1.17E-01 K-40 4 .0SE-01 1.83E-01 2 .11E-01 Sample ID: 489749 Sample Dates: 11/26/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .03E-02 O.OOE+OO 2.03E-02 Cs-134 < 1.65E-02 O.OOE+OO 1.65E-02 Cs-137 < 1.34E-02 0.00E+OO 1.34E-02 Be-7 < 1.17E-01 O.OOE+OO 1.17E-01 K-40 4 .73E-01 1.79E-01 1.69E-01 Sample ID: 490172 Sample Dates: 12/3/2018 - 12/10/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.39E-02 O.OOE+OO 3.39E-02 Cs-134 <1.93E-02 O.OOE+OO 1.93E-02 Cs-137 <1.69E-02 O.OOE+OO 1.69E-02 Be-7 < 1.27E-01 O.OOE+OO 1.27E-01 K-40 5.26E-01 1.69E-01 3.47E-02 Sample ID: 490819 Sample Dates: 12/10/2018 -12/18/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.45E-02 O.OOE+OO 2.45E-02 Cs-134 < 1.81 E-02 O.OOE+OO 1.81E-02 Cs- 137 <1.34E-02 O.OOE+OO 1.34E-02 Be-7 <8 .09E-02 O.OOE+OO 8.09E-02 K-40 2.84E-01 1.39E-01 1.56E-01 Report Generated@ 5/1/201911:57:36 EnRad Laboratories Appendix E- Page 31 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 079 [ INDICATOR - NE @ 0.56 miles ]

Sample ID: 491194 Sample Dates: 12/18/2018 - 12/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.93E-02 O.OOE+OO 3.93E-02 Cs-134 <1.77E-02 O.OOE+OO 1.77E-02 Cs-137 <1.20E-02 O.OOE+OO 1.20E-02 Be-7 <1.03E-01 O.OOE+OO 1.03E-01 K-40 <2.95E-01 O.OOE+OO 2.95E-01 Sample ID: 491495 Sample Dates : 12/26/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <4.95E-02 O.OOE+OO 4.95E-02 Cs-134 <2.95E-02 O.OOE+OO 2.95E-02 Cs-137 <2.51E-02 O.OOE+OO 2.51E-02 Be-7 <1.85E-01 O.OOE+OO 1.85E-01 K-40 6.24E-01 2.67E-01 3.08E-01 Sample Point 081 [ CONTROL - SE@ 9.33 miles]

Sample ID: 465661 Sample Dates : 1/2/2018 -1/8/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.92E-02 O.OOE+OO 2.92E-02 Cs-134 <1 .80E-02 O.OOE+OO 1.80E-02 Cs-137 <2 .06E-02 O.OOE+OO 2.06E-02 Be-7 <1 .30E-01 O.OOE+OO 1.30E-01 K-40 5.52E-01 2.26E-01 2.47E-01 Sample ID: 466016 Sample Dates: 1/8/2018 -1/15/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <2.32E-02 O.OOE+OO 2.32E-02 Cs-134 <1.72E-02 O.OOE+OO 1.72E-02 Cs-137 <1 .77E-02 O.OOE+OO 1.77E-02 Be-7 <1.38E-01 O.OOE+OO 1.38E-01 K-40 4.58E-01 2.00E-01 2.40E-01 Sample ID: 466218 Sample Dates: 1/15/2018 -1/22/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.16E-02 O.OOE+OO 2.16E-02 Cs-134 < 1.09E-02 O.OOE+OO 1.09E-02 Cs-137 <1.53E-02 O.OOE+OO 1.53E-02 Be-7 < 1.08E-01 O.OOE+OO 1.08E-01 K-40 4.24E-01 1.77E-01 1.87E-01 Sample ID: 466403 Sample Dates: 1/22/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.0SE-02 O.OOE+OO 2.0SE-02 Cs-134 <1.98E-02 O.OOE+OO 1.98E-02 Cs-137 < 1.54E-02 O.OOE+OO 1.54E-02 Be-7 < 1.19E-01 O.OOE+OO 1.19E-01 K-40 7.56E-01 2.24E-01 1.82E-01 Sample ID: 467001 Sample Dates: 1/29/2018 - 2/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1.96E-02 O.OOE+OO 1.96E-02 Cs-134 <1 .75E-02 O.OOE+OO 1.75E-02 Cs-137 < 1.SSE-02 O.OOE+OO 1.SSE-02 Be-7 < 1.40E-01 O.OOE+OO 1.40E-01 K-40 4.07E-01 1.62E-01 1.43E-01 Sample ID: 467353 Sample Dates: 2/5/2018 - 2/12/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <2. 00E-02 O.OOE+OO 2.00E-02 Cs-134 < 1.90E-02 O.OOE+OO 1.90E-02 Cs-137 < 1.62E-02 O.OOE+OO 1.62E-02 Be-7 <8 .87E-02 O.OOE+OO 8.87E-02 K-40 5.20E-01 1.89E-01 1.SOE-01 Sample ID: 467677 Sample Dates: 2/12/2018 - 2/19/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.62E-02 O.OOE+OO 2.62E-02 Cs-134 <1.37E-02 O.OOE+OO 1.37E-02 Cs-137 <1.72E-02 O.OOE+OO 1.72E-02 Be-7 < 1.15E-01 O.OOE+OO 1.15E-01 K-40 4.15E-01 1.79E-01 1.94E-01 Sample ID: 468451 Sample Dates: 2/19/2018 - 2/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.22E-02 O.OOE+OO 2.22E-02 Cs-134 <1.96E-02 O.OOE+OO 1.96E-02 Cs-137 <1.57E-02 O.OOE+OO 1.57E-02 Be-7 <1.26E-01 O.OOE+OO 1.26E-01 K-40 5.36E-01 1.77E-01 1.18E-01 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 32 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 081 [ CONTROL - SE @ 9.33 miles]

Sample ID: 468779 Sample Dates: 2/26/2018 - 3/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.95E-02 O.OOE+OO 1.95E-02 Cs-134 < 1.75E-02 O.OOE+OO 1.75E-02 Cs-137 <2.10E-02 O.OOE+OO 2.10E-02 Be-7 < 1.03E-01 0.00E+OO 1.03E-01 K-40 6.25E-01 2.16E-01 2.15E-01 Sample ID: 469587 Sample Dates: 3/5/2018 - 3/12/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.82E-02 O.OOE+OO 1.82E-02 Cs-134 < 1.89E-02 O.OOE+OO 1.89E-02 Cs-137 < 1.56E-02 0.00E+OO 1.SSE-02 Be-7 < 1.16E-01 O.OOE+OO 1.16E-01 K-40 5.82E-01 2.14E-01 2.31 E-01 Sample ID: 470622 Sample Dates : 3/12/2018 - 3/19/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <2.25E-02 0.00E+OO 2.25E-02 Cs-134 <2. 00E-02 O.OOE+OO 2.00E-02 Cs- 137 < 1.76E-02 0.00E+OO 1.76E-02 Be-7 < 1.32E-01 O.OOE+OO 1.32E-01 K-40 3.48E-01 1.72E-01 2.07E-01 Sample ID: 471173 Sample Dates: 3/19/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <2.20E-02 O.OOE+OO 2.20E-02 Cs-134 <1.67E-02 O.OOE+OO 1.67E-02 Cs-137 <1.64E-02 O.OOE+OO 1.64E-02 Be-7 <1 .37E-01 O.OOE+OO 1.37E-01 K-40 6.81E-01 2.1 4E-01 1.81E-01 Sample ID: 471734 Sample Dates: 3/26/2018 -4/2/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.01E-02 O.OOE+OO 2.01E-02 Cs-134 <1.69E-02 0.00E+OO 1.69E-02 Cs- 137 <1.71 E-02 O.OOE+OO 1.71E-02 Be-7 <1.42E-01 O.OOE+OO 1.42E-01 K-40 4.59E-01 1.79E-01 1.73E-01 Sample ID: 472531 Sample Dates : 4/2/2018 - 4/9/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.09E-02 O.OOE+OO 2.09E-02 Cs-134 <1.49E-02 O.OOE+OO 1.49E-02 Cs-137 <1.SSE-02 O.OOE+OO 1.SSE-02 Be-7 <1.27E-01 O.OOE+OO 1.27E-01 K-40 5.46E-01 2.16E-01 2.52E-01 Sample ID: 473000 Sample Dates: 4/9/2018 - 4/16/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.63E-02 0.00E+OO 2.63E-02 Cs-134 < 1.90E-02 O.OOE+OO 1.90E-02 Cs-137 < 1.56E-02 O.OOE+OO 1.56E-02 Be-7 <1. 30E-01 O.OOE+OO 1.30E-01 K-40 <3.95E-01 0.00E+OO 3.95E-01 Sample ID: 473281 Sample Dates : 4/16/2018 -4/23/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .42E-02 O.OOE+OO 2.42E-02 Cs-134 <1.71E-02 0.00E+OO 1.71 E-02 Cs-137 < 1.40E-02 O.OOE+OO 1.40E-02 Be-7 < 1.25E-01 O.OOE+OO 1.25E-01 K-40 3.72E-01 1.SOE-01 1.21E-01 Sample ID: 473653 Sample Dates: 4/23/2018 - 4/30/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.33E-02 O.OOE+OO 2.33E-02 Cs-134 <1.68E-02 O.OOE+OO 1.68E-02 Cs-137 <1.70E-02 O.OOE+OO 1.70E-02 Be-7 <9.94E-02 O.OOE+OO 9.94E-02 K-40 6.41E-01 2.03E-01 1.56E-01 Sample ID: 474169 Sample Dates: 4/30/2018 - 5/7/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.29E-02 O.OOE+OO 2.29E-02 Cs-134 <2.04E-02 0.00E+OO 2.04E-02 Cs-137 < 1.78E-02 O.OOE+OO 1.78E-02 Be-7 <8.95E-02 0.00E+OO 8.95E-02 K-40 4.48E-01 1.79E-01 1.82E-01 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 33 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 081 [ CONTROL - SE @ 9.33 miles ]

Sample ID: 474547 Sample Dates: 5/7/2018 -5/14/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.21E-02 O.OOE+OO 2.21 E-02 Cs-134 <1.52E-02 0.00E+OO 1.52E-02 Cs-137 <1.79E-02 O.OOE+OO 1.79E-02 Be-7 <1.05E-01 O.OOE+OO 1.05E-01 K-40 5.15E-01 1.BBE-01 3.49E-02 Sample ID: 474914 Sample Dates : 5/14/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .01E-02 O.OOE+OO 2.01 E-02 Cs-134 <1.84E-02 O.OOE+OO 1.84E-02 Cs-137 <1 .B9E-02 O.OOE+OO 1.B9E-02 Be-7 <1. 11 E-01 O.OOE+OO 1.11E-01 K-40 3.40E-01 1.95E-01 2.69E-01 Sample ID: 475234 Sample Dates: 5/21/2018 -5/29/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .07E-02 O.OOE+OO 2.07E-02 Cs-134 <1.SOE-02 O.OOE+OO 1.BOE-02 Cs-137 <1.31 E-02 O.OOE+OO 1.31 E-02 Be-7 <9.0BE-02 0.00E+OO 9.0BE-02 K- 40 4.29E-01 1.59E-01 1.43E-01 Sample ID: 475555 Sample Dates: 5/29/2018 - 6/4/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.36E-02 O.OOE+OO 2.36E-02 Cs-134 <2.02E-02 0.00E+OO 2.02E-02 Cs-137 <2.23E-02 O.OOE+OO 2.23E-02 Be-7 <1.38E-01 O.OOE+OO 1.3BE-01 K-40 4.89E-01 2.41 E-01 3.14E-01 Sample ID: 476380 Sample Dates: 6/4/2018 - 6/11/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1. 93E-02 O.OOE+OO 1.93E-02 Cs-134 < 1.75E-02 O.OOE+OO 1.75E-02 Cs-137 < 1.98E-02 O.OOE+OO 1.9BE-02 Be-7 < 1.33E-01 O.OOE+OO 1.33E-01 K-40 3.75E-01 2.03E-01 2.73E-01 Sample ID: 477400 Sample Dates: 6/11/2018 - 6/18/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.11 E-02 O.OOE+OO 2.11E-02 Cs- 134 < 1.57E-02 O.OOE+OO 1.57E-02 Cs-137 < 1.94E-02 0.00E+OO 1.94E-02 Be-7 < 1.34E-01 O.OOE+OO 1.34E-01 K-40 4.SBE-01 1.B1E-01 1.79E-01 Sample ID: 478126 Sample Dates : 6/18/2018 - 6/25/2018 Nuclide Activity 2 Sigma Error MDA 1-1 31 <2.39E-02 O.OOE+OO 2.39E-02 Cs-134 < 1.82E-02 0.00E+OO 1.82E-02 Cs-137 < 1.90E-02 O.OOE+OO 1.90E-02 Be-7 <1.21 E-01 O.OOE+OO 1.21 E-01 K-40 5.32E-01 1.71E-01 3.52E-02 Sample ID: 478442 Sample Dates: 6/25/2018

7/2/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2. 18E-02 O.OOE+OO 2.1BE-02 Cs-134 <1.52E-02 O.OOE+OO 1.52E-02 Cs-137 <1.70E-02 0.00E+OO 1.70E-02 Be-7 <1.15E-01 O.OOE+OO 1.15E-01 K-40 6.49E-01 2.04E-01 1.58E-01 Sample ID: 478815 Sample Dates: 7/2/2018 - 7/9/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .29E-02 O.OOE+OO 2.29E-02 Cs-134 < 1.44E-02 0.00E+OO 1.44E-02 Cs-137 < 1.BBE-02 O.OOE+OO 1.BBE-02 Be-7 < 1.30E-01 O.OOE+OO 1.30E-01 K-40 4.06E-01 1.66E-01 1.61E-01 Sample ID: 479221 Sample Dates: 7/9/2018 -7/16/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.50E-02 O.OOE+OO 2.50E-02 Cs-134 < 1.90E-02 O.OOE+OO 1.90E-02 Cs-137 < 1.71 E-02 O.OOE+OO 1.71 E-02 Be-7 <1. 11E-01 O.OOE+OO 1.11E-01 K-40 4.BOE-01 1.BSE-01 2.00E-01 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 34 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RAD.IOIODINE Concentration (Activity): pCi/m3 Sample Point 081 [ CONTROL - SE@ 9.33 miles]

Sample ID: 479902 Sample Dates: 7/16/2018 - 7/23/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.98E-02 O.OOE+OO 1.98E-02 Cs-134 < 1.96E-02 O.OOE+OO 1.96E-02 Cs-137 < 1.62E-02 0.00E+OO 1.62E-02 Be-7 <1.26E-01 O.OOE+OO 1.26E-01 K-40 <3.68E-01 0.00E+OO 3.68E-01 Sample ID: 480265 Sample Dates: 7/23/2018 - 7/30/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .35E-02 O.OOE+OO 2.35E-02 Cs-134 < 1.65E-02 O.OOE+OO 1.65E-02 Cs-137 < 1.94E-02 O.OOE+OO 1.94E-02 Be-7 < 1.20E-01 0.00E+OO 1.20E-01 K-40 4.0SE-01 1.61E-01 1.44E-01 Sample ID: 481092 Sample Dates: 7/30/2018 - 8/6/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2. 07E-02 O.OOE+OO 2.07E-02 Cs-134 < 1.87E-02 0.00E+OO 1.87E-02 Cs-137 <2.13E-02 O.OOE+OO 2.13E-02 Be-7 <1 .33E-01 O.OOE+OO 1.33E-01 K-40 <3.63E-01 O.OOE+OO 3.63E-01 Sample ID: 481533 Sample Dates: 8/6/2018 -8/13/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.47E-02 0.00E+OO 2.47E-02 Cs-134 < 1.73E-02 O.OOE+OO 1.73E-02 Cs-137 <1.SBE-02 O.OOE+OO 1.SBE-02 Be-7 <1.34E-01 O.OOE+OO 1.34E-01 K-40 4.76E-01 2.12E-01 2.64E-01 Sample ID: 481983 Sample Dates: 8/13/2018 - 8/20/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.96E-02 O.OOE+OO 1.96E-02 Cs-134 < 1.56E-02 O.OOE+OO 1.56E-02 Cs-137 <9.12E-03 O.OOE+OO 9.12E-03 Be-7 <7 .62E-02 O.OOE+OO 7.62E-02 K-40 <2 .BSE-01 O.OOE+OO 2.85E-01 Sample ID: 482501 Sample Dates: 8/20/2018 - 8/27/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1.48E-02 0.00E+OO 1.4SE-02 Cs-134 <1.32E-02 O.OOE+OO 1.32E-02 Cs-137 <1.57E-02 0.00E+OO 1.57E-02 Be-7 <7.SBE-02 O.OOE+OO 7.58E-02 K-40 3.33E-01 1.47E-01 1.46E-01 Sample ID: 482826 Sample Dates: 8/27/2018 -9/4/2018 Nuclide Activity 2 Sigma Error MDA 1- 13 1 < 1.49E-02 O.OOE+OO 1.49E-02 Cs-134 <1.24E-02 0.00E+OO 1.24E-02 Cs-137 <1.SSE-02 O.OOE+OO 1.55E-02 Be-7 <6 .23E-02 0.00E+OO 6.23E-02 K-40 3.71E-01 1.29E-01 2.B7E-02 Sample ID: 483448 Sample Dates: 9/4/2018 - 9/10/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2. 93E-02 0.00E+OO 2.93E-02 Cs-134 < 1.91 E-02 O.OOE+OO 1.91 E-02 Cs-137 < 1.49E-02 O.OOE+OO 1.49E-02 Be-7 < 1.40E-01 0 .00E+OO 1.40E-01 K-40 6.87E-01 2.48E-01 2.62E-01 Sample ID: 484045 Sample Dates: 9/10/2018 - 9/17/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.29E-02 0.00E+OO 3.29E-02 Cs-134 < 1.63E-02 O.OOE+OO 1.63E-02 Cs-137 < 1.91 E-02 0.00E+OO 1.91 E-02 Be-7 < 1.29E-01 O.OOE+OO 1.29E-01 K-40 4.38E-01 2.07E-01 2.61 E-01 Sample ID: 484620 Sample Dates : 9/17/2018 - 9/24/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.12E-02 0.00E+OO 2.12E-02 Cs-134 < 1.51E-02 O.OOE+OO 1.51 E-02 Cs-137 <1 .63E-02 0.00E+OO 1.63E-02 Be-7 <1 .26E-01 O.OOE+OO 1.26E-01 K-40 3.96E-01 1.46E-01 3.46E-02 Report Generated@ 5/1/201911 :57:36 EnRad Laboratories Appendix E - Page 35 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 081 [ CONTROL - SE @ 9.33 miles ]

Sample ID: 485045 Sample Dates: 9/24/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.81E-02 0.00E+OO 2.81 E-02 Cs-134 <1.94E-02 O.OOE+OO 1.94E-02 Cs-137 <1.79E-02 O.OOE+OO 1.79E-02 Be-7 <1.28E-01 O.OOE+OO 1.28E-01 K-40 3.88E-01 1.81 E-01 2.13E-01 Sample ID: 485508 Sample Dates: 10/1/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.94E-02 0.00E+OO 1.94E-02 Cs-134 < 1.96E-02 O.OOE+OO 1.96E-02 Cs-137 < 1.52E-02 O.OOE+OO 1.52 E-02 Be-7 < 1.31E-01 O.OOE+OO 1.31E-01 K-40 6.33E-01 1.86E-01 3.43E-02 Sample ID: 486185 Sample Dates: 10/8/2018 -10/15/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.SSE-02 O.OOE+OO 2.SSE-02 Cs-134 <2.01E-02 0.00E+OO 2.01 E-02 Cs-137 <1.81 E-02 0.00E+OO 1.81E-02 Be-7 <1.22E-01 O.OOE+OO 1.22E-01 K-40 5.72E-01 1.89E-01 1.41E-01 Sample ID: 486717 Sample Dates: 10/1512018 -10/22/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.09E-02 0.00E+OO 2.09E-02 Cs-134 <1.96E-02 O.OOE+OO 1.96E-02 Cs-137 <1.67E-02 O.OOE+OO 1.67E-02 Be-7 <1 .03E-01 O.OOE+OO 1.03E-01 K-40 5.07E-01 2.18E-01 2.68E-01 Sample ID: 487756 Sample Dates: 10/22/2018 -10/29/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.02E-02 O.OOE+OO 2.02E-02 Cs-134 <1.53E-02 O.OOE+OO 1.53E-02 Cs-137 < 1.SOE-02 0.00E+OO 1.SOE-02 Be-7 1.94E-02 7.66E-02 1.36E-01 K-40 6.32E-01 2.00E-01 1.49E-01 Sample ID: 488000 Sample Dates: 1012912018 -1115/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.78E-02 O.OOE+OO 1.78E-02 Cs-134 < 1.78E-02 O.OOE+OO 1.78E-02 Cs-137 < 1.86E-02 O.OOE+OO 1.86E-02 Be-7 <1 .21E-01 O.OOE+OO 1.21E-01 K-40 3.18E-01 1.70E-01 2.17E-01 Sample ID: 488492 Sample Dates : 1115/2018 - 11/12/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.22E-02 O.OOE+OO 2.22E-02 Cs-134 < 1.61 E-02 O.OOE+OO 1.61 E-02 Cs- 137 < 1.44E-02 O.OOE+OO 1.44E-02 Be-7 <1.42E-01 0.00E+OO 1.42E-01 K-40 3.95E-01 1.73E-01 1.87E-01 Sample ID: 488871 Sample Dates : 11112/2018 -11/19/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.30E-02 O.OOE+OO 3.30E-02 Cs-134 < 1.85E-02 O.OOE+OO 1.BSE-02 Cs-137 < 1.72E-02 O.OOE+OO 1.72E-02 Be-7 < 1.04E-01 O.OOE+OO 1.04E-01 K-40 4.54E-01 2.02E-01 2.45E-01 Sample ID: 489168 Sample Dates: 11/19/2018 -11/2612018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.32E-02 O.OOE+OO 2.32E-02 Cs-134 <1.69E-02 O.OOE+OO 1.69E-02 Cs-137 <1.95E-02 O.OOE+OO 1.95E-02 Be-7 <1.04E-01 O.OOE+OO 1.04E-01 K-40 6.61E-01 2.1 SE-01 1.93E-01 Sample ID: 489750 Sample Dates: 11/26/2018 -1213/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <2. 10E-02 O.OOE+OO 2.10E-02 Cs-134 < 1.90E-02 O.OOE+OO 1.90E-02 Cs-137 <1.57E-02 O.OOE+OO 1.57E-02 Be-7 <1 .37E-01 0.00E+OO 1.37E-01 K-40 3.47E-01 1.62E-01 1.81E-01 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 36 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentratlon (Activity): pCi/m3 Sample Point 081 [ CONTROL - SE@ 9.33 miles]

Sample ID: 490173 Sample Dates: 12/3/2018 -12/10/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.54E-02 O.OOE+OO 3.54E-02 Cs-134 <1 .44E-02 O.OOE+OO 1.44E-02 Cs-137 < 1.64E-02 O.OOE+OO 1.64E-02 Be-7 < 1.30E-01 O.OOE+OO 1.30E-01 K-40 5.39E-01 1.92E-01 1.77E-01 Sample ID: 490820 Sample Dates: 12/10/2018 -12/18/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.0SE-02 O.OOE+OO 3.0SE-02 Cs-134 <1.01E-02 O.OOE+OO 1.01 E-02 Cs-137 <1.26E-02 O.OOE+OO 1.26E-02 Be-7 <8.12E-02 O.OOE+OO 8.12E-02 K-40 <2.79E-01 O.OOE+OO 2.79E-01 Sample ID: 491195 Sample Dates: 12/18/2018 -12/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <4.81 E-02 O.OOE+OO 4.81 E-02 Cs-134 < 1.35E-02 O.OOE+OO 1.35E-02 Cs-137 < 1.58E-02 O.OOE+OO 1.SBE-02 Be-7 <1 .40E-01 O.OOE+OO 1.40E-01 K-40 3.59E-01 1.67E-01 2.01 E-01 Sample ID: 491496 Sample Dates : 12/26/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <4.30E-02 O.OOE+OO 4.30E-02 Cs-134 <2.42E-02 O.OOE+OO 2.42E-02 Cs-137 <2.34E-02 O.OOE+OO 2.34E-02 Be-7 <1.92E-01 O.OOE+OO 1.92E-01 K-40 6.40E-01 2.52E-01 2.54E-01 Sample Point 084 [ INDICATOR - NNE@ 2.58 miles]

Sample ID: 465662 Sample Dates: 1/2/2018 -1/8/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.68E-02 O.OOE+OO 2.68E-02 Cs-134 <2.37E-02 0.00E+OO 2.37E-02 Cs-137 <2.24E-02 O.OOE+OO 2.24E-02 Be-7 <1.38E-01 0.00E+OO 1.38E-01 K-40 4.27E-01 2.10E-01 2.SSE-01 Sample ID: 466017 Sample Dates: 1/8/2018 -1/15/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.04E-02 O.OOE+OO 2.04E-02 Cs-134 < 1.65E-02 O.OOE+OO 1.65E-02 Cs-137 < 1.77E-02 O.OOE+OO 1.77E-02 Be-7 <1.18E-01 O.OOE+OO 1.18E-01 K-40 5.42E-01 2.04E-01 2.18E-01 Sample ID: 466219 Sample Dates: 1/15/2018 - 1/22/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1.90E-02 O.OOE+OO 1.90E-02 Cs-134 <1.52E-02 O.OOE+OO 1.52E-02 Cs-137 < 1.74E-02 O.OOE+OO 1.74E-02 Be-7 <1.35E-01 O.OOE+OO 1.35E-01 K-40 6.68E-01 2.03E-01 1.41E-01 Sample ID: 466404 Sample Dates: 1/22/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.95E-02 O.OOE+OO 1.95E-02 Cs-134 < 1.91E-02 O.OOE+OO 1.91 E-02 Cs-137 < 1.58E-02 0.00E+OO 1.58E-02 Be-7 < 1.19E-01 O.OOE+OO 1.19E-01 K-40 6.76E-01 1.93E-01 3.45E-02 Sample ID: 467002 Sample Dates: 1/29/2018 - 2/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.17E-02 O.OOE+OO 2.17E-02 Cs-134 <1.61E-02 O.OOE+OO 1.61 E-02 Cs-137 < 1.94E-02 0.00E+OO 1.94E-02 Be-7 <1.23E-01 0.00E+OO 1.23E-01 K-40 5.44E-01 1.73E-01 3.51E-02 Sample ID: 467354 Sample Dates: 2/5/2018 - 2/12/2018 Nuclide Activity 2 Sigma Error MDA 1-1 31 <2.42E-02 O.OOE+OO 2.42E-02 Cs-134 <1 .84E-02 O.OOE+OO 1.84E-02 Cs-137 <1.77E-02 O.OOE+OO 1.77E-02 Be-7 <1.04E-01 O.OOE+OO 1.04E-01 K-40 5.?0E-01 1.87E-01 1.38E-01 Report Generated@ 5/1/201911 :57:36 EnRad Laboratories Appendix E - Page 37 of 91 Duke Energy Annual Report -Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 084 [ INDICATOR - NNE@ 2.58 miles]

Sample ID: 467678 Sample Dates: 2/12/2018 - 2/19/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.35E-02 O.OOE+OO 2.35E-02 Cs-134 <1.62E-02 O.OOE+OO 1.62E-02 Cs-137 <1.94E-02 O.OOE+OO 1.94E-02 Be-7 <1.24E-01 O.OOE+OO 1.24E-01 K-40 4 .3BE-01 1.84E-01 2.00E-01 Sample ID: 468452 Sample Dates: 2/19/2018 -2/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.11E-02 O.OOE+OO 2.11E-02 Cs-134 <2.07E-02 0.00E+OO 2.07E-02 Cs-137 <1.52E-02 O.OOE+OO 1.52E-02 Be-7 <1.1BE-01 0.00E+OO 1.1BE-01 K-40 <3 .47E-01 O.OOE+OO 3.47E-01 Sample ID: 468780 Sample Dates: 2/26/2018 - 3/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .07E-02 O.OOE+OO 2.07E-02 Cs-134 < 1.BBE-02 O.OOE+OO 1.BBE-02 Cs-137 < 1.BOE-02 O.OOE+OO 1.BOE-02 Be-7 < 1.26E-01 O.OOE+OO 1.26E-01 K-40 <4.34E-01 O.OOE+OO 4 .34E-01 Sample ID: 469588 Sample Dates: 3/5/2018 - 3/12/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.38E-02 O.OOE+OO 2.38E-02 Cs-134 <1.64E-02 O.OOE+OO 1.64E-02 Cs-137 <1.76E-02 O.OOE+OO 1.76E-02 Be-7 <9.99E-02 O.OOE+OO 9.99E-02 K-40 3.65E-01 1.89E-01 2 .44E-01 Sample ID: 470623 Sample Dates: 3/12/2018 - 3/19/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.44E-02 O.OOE+OO 2.44E-02 Cs-134 < 1.9BE-02 O.OOE+OO 1.9BE-02 Cs-137 < 1.42E-02 O.OOE+OO 1.42E-02 Be-7 <8.1 5E-02 O.OOE+OO B.15E-02 K-40 4.01 E-01 2.06E-01 2.72E-01 Sample ID: 471174 Sample Dates : 3/19/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.52E-02 0.00E+OO 2.52E-02 Cs-134 < 1.68E-02 O.OOE+OO 1.6BE-02 Cs- 137 < 1.44E-02 O.OOE+OO 1.44E-02 Be-7 < 1.07E-01 O.OOE+OO 1.07E-01 K-40 4 .99E-01 1.BSE-01 1.70E-01 Sample ID: 471735 Sample Dates: 3/26/2018 -4/2/2018 Nuclide Activity 2 Sigma Error MDA 1-1 3 1 <2.00E-02 O.OOE+OO 2.00E-02 Cs-134 < 1.53E-02 O.OOE+OO 1.53E-02 Cs-137 <1.BSE-02 O.OOE+OO 1.BSE-02 Be-7 <1.2BE-01 O.OOE+OO 1.28E-01 K-40 3.53E-01 1.61E-01 1.72E-01 Sample ID: 472532 Sample Dates: 4/2/2018 -4/9/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1.BOE-02 O.OOE+OO 1.BOE-02 Cs-134 < 1.72E-02 0.00E+OO 1.72E-02 Cs-137 <2.14E-02 O.OOE+OO 2.14E-02 Be-7 < 1.31 E-01 O.OOE+OO 1.3 1E-01 K-40 4.69E-01 2.06E-01 2.51 E-01 Sample ID: 473001 Sample Dates: 4/9/2018 - 4/16/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.0SE-02 O.OOE+OO 3.0SE-02 Cs-134 <1 .76E-02 O.OOE+OO 1.76E-02 Cs-137 <1.B6E-02 0.00E+OO 1.B6E-02 Be-7 <1.33E-01 0.00E+OO 1.33E-01 K-40 4.25E- 01 1.59E-01 1.10E-01 Sample ID: 473282 Sample Dates: 4/16/2018 -4/23/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.56E-02 0.00E+OO 2.56E-02 Cs-134 < 1.41 E-02 O.OOE+OO 1.41E-02 Cs-137 < 1.66E-02 0.00E+OO 1.66E-02 Be-7 < 1.33E-01 O.OOE+OO 1.33E-01 K-40 4.07E-01 1.82E-01 2.11E-01 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 38 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 {Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 084 [ INDICATOR - NNE @ 2.58 miles ]

Sample ID: 473654 Sample Dates: 4/23/2018 - 4/30/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.SOE-02 O.OOE+OO 2.SOE-02 Cs-134 <1.90E-02 O.OOE+OO 1.90E-02 Cs-137 <1.95E-02 O.OOE+OO 1.95E-02 Be-7 <1.27E-01 O.OOE+OO 1.27E-01 K-40 5.SSE-01 1.89E-01 1.SOE-01 Sample ID: 474170 Sample Dates: 4/30/2018 - 5/7/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.14E-02 O.OOE+OO 2.14E-02 Cs-134 < 1.65E-02 0.00E+OO 1.65E-02 Cs-137 < 1.52E-02 O.OOE+OO 1.52E-02 Be-7 <1.17E-01 0.00E+OO 1.17E-01 K-40 5.75E-01 2.14E-01 2.33E-01 Sample ID: 474548 Sample Dates: 5/7/2018 -5/14/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.23E-02 O.OOE+OO 2.23E-02 Cs-134 <1 .67E-02 O.OOE+OO 1.67E-02 Cs-137 <1.42E-02 O.OOE+OO 1.42E-02 Be-7 <1.27E-01 O.OOE+OO 1.27E-01 K-40 3.47E-01 1.SOE-01 1.36E-01 Sample ID: 474915 Sample Dates: 5/14/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.06E-02 0.00E+OO 2.06E-02 Cs-134 <1.34E-02 O.OOE+OO 1.34E-02 Cs-137 <1.72E-02 O.OOE+OO 1.72E-02 Be-7 <1.21E-01 O.OOE+OO 1.21 E-01 K-40 4.35E-01 1.77E-01 1.82E-01 Sample ID: 475235 Sample Dates: 5/21/2018 - 5/29/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <2.17E-02 O.OOE+OO 2.17E-02 Cs-134 < 1.35E-02 O.OOE+OO 1.35E-02 Cs-137 < 1.51 E-02 O.OOE+OO 1.51E-02 Be-7 <1.14E-01 O.OOE+OO 1.14E-01 K-40 4.37E-01 1.73E-01 1.SSE-01 Sample ID: 475556 Sample Dates: 5/29/2018 - 6/4/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.49E-02 O.OOE+OO 2.49E-02 Cs-134 <2.09E-02 O.OOE+OO 2.09E-02 Cs-137 < 1.65E-02 O.OOE+OO 1.65E-02 Be-7 < 1.14E-01 O.OOE+OO 1.14E-01 K-40 5.35E-01 2.14E-01 2.23E-01 Sample ID: 476381 Sample Dates: 6/4/2018 - 6/11/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.29E-02 O.OOE+OO 2.29E-02 Cs-134 < 1.81E-02 0.00E+OO 1.81E-02 Cs-137 < 1.65E-02 O.OOE+OO 1.65E-02 Be-7 < 1.22E-01 O.OOE+OO 1.22E-01 K-40 6.45E-01 2.20E-01 2. 1SE-01 Sample ID: 477401 Sample Dates: 6/11/2018 - 6/18/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.62E-02 O.OOE+OO 2.62E-02 Cs-134 <2.22E-02 O.OOE+OO 2.22E-02 Cs-137 < 1.41E-02 O.OOE+OO 1.41E-02 Be-7 < 1.15E-01 O.OOE+OO 1.15E-01 K-40 4.56E-01 1.79E-01 1.79E-01 Sample ID: 478127 Sample Dates: 6/18/2018 - 6/25/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.31E-02 O.OOE+OO 2.31E-02 Cs-134 < 1.46E-02 O.OOE+OO 1.46E-02 Cs-137 < 1.61 E-02 O.OOE+OO 1.6 1 E-02 Be-7 < 1.36E-01 O.OOE+OO 1.36E-01 K-40 4.67E-01 1.SSE-01 1.89E-01 Sample ID: 478443 Sample Dates: 6/25/2018 -7/2/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <2.14E-0 2 O.OOE+OO 2.14E-02 Cs-134 < 1.44E-02 O.OOE+OO 1.44E-02 Cs-137 < 1.54E-02 O.OOE+OO 1.54E-02 Be-7 < 1.29E-01 O.OOE+OO 1.29E-01 K-40 4.31 E-01 1.SOE-01 1.91 E-01 Report Generated@ 5/1/201911 :57:36 EnRad Laboratories Appendix E - Page 39 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 084 [ INDICATOR - NNE@ 2.58 miles J Sample ID: 478816 Sample Dates: 7/2/2018

7/9/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.43E-02 O.OOE+OO 2.43E-02 Cs-134 <1.44E-02 0.00E+OO 1.44E-02 Cs-137 <1.70E-02 O.OOE+OO 1.70E-02 Be-7 <1.02E-01 O.OOE+OO 1.02E-01 K-40 3.92E-01 1.87E-01 2.28E-01 Sample ID: 479222 Sample Dates: 7/9/2018 - 7/16/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.59E-02 O.OOE+OO 2.59E-02 Cs-134 <1.89E-02 O.OOE+OO 1.89E-02 Cs-137 <2.16E-02 O.OOE+OO 2.16E-02 Be-7 <1.39E-01 O.OOE+OO 1.39E-01 K-40 4.48E-01 1.74E-01 1.65E-01 Sample ID: 479903 Sample Dates: 7/16/2018 - 7/23/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.43E-02 O.OOE+OO 2.43E-02 Cs-134 <1 .62E-02 0.00E+OO 1.62E-02 Cs-137 < 1.61 E-02 O.OOE+OO 1.61 E-02 Be-7 <1.20E-01 0.00E+OO 1.20E-01 K-40 4.98E-01 1.76E-01 1.31E-01 Sample ID: 480266 Sample Dates: 7/23/2018 -7/30/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1 .94E-02 O.OOE+OO 1.94E-02 Cs-134 <1.34E-02 0.00E+OO 1.34E-02 Cs-137 <1 .78E-02 O.OOE+OO 1.78E-02 Be-7 <1.26E-01 O.OOE+OO 1.26E-01 K-40 6.75E-01 2.04E-01 1.42E-01 Sample ID: 481093 Sample Dates: 7/30/2018 - 8/6/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.04E-02 O.OOE+OO 2.04E-02 Cs-134 <1.87E-02 O.OOE+OO 1.87E-02 Cs-137 <1.48E-02 O.OOE+OO 1.48E-02 Be-7 <1 .33E-01 O.OOE+OO 1.33E-01 K-40 4.SOE-01 2.13E-01 2.72E-01 Sample ID: 481534 Sample Dates: 8/6/2018 -8/13/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.65E-02 O.OOE+OO 2.65E-02 Cs-134 <1.42E-02 O.OOE+OO 1.42E-02 Cs-137 <1.62E-02 0.00E+OO 1.62E-02 Be-7 <1 .13E-01 O.OOE+OO 1.13E-01 K-40 4.41 E-01 1.72E-01 1.61E-01 Sample ID: 481984 Sample Dates: 8/13/2018 - 8/20/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.16E-02 O.OOE+OO 3.16E-02 Cs-134 < 1.64E-02 0.00E+OO 1.64E-02 Cs-137 <1 .59E-02 O.OOE+OO 1.59E-02 Be-7 <1.21E-01 0.00E+OO 1.21E-01 K-40 5.27E-01 2.02E-01 2.18E-01 Sample ID: 482502 Sample Dates: 8/20/2018 - 8/27/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.68E-02 O.OOE+OO 1.68E-02 Cs-134 < 1.35E-02 O.OOE+OO 1.35E-02 Cs-137 < 1.38E-02 0.00E+OO 1.38E-02 Be-7 < 1.08E-01 O.OOE+OO 1.08E-01 K-40 2.28E-01 1.SSE-01 2.17E-01 Sample ID: 482827 Sample Dates: 8/27/2018

9/4/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1.84E-02 O.OOE+OO 1.84E-02 Cs-134 <1 .59E-02 0.00E+OO 1.59E-02 Cs-137 < 1.37E-02 O.OOE+OO 1.37E-02 Be-7 <9.54E-02 O.OOE+OO 9.54E-02 K-40 2.03E-01 1.41E-01 1.9BE-01 Sample ID: 483449 Sample Dates: 9/4/2018 - 9/10/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.92E-02 O.OOE+OO 2.92E-02 Cs-134 <2.34E-02 0.00E+OO 2.34E-02 Cs-137 <1.BSE-02 O.OOE+OO 1.88E-02 Be-7 <1.52E-01 0.00E+OO 1.52E-01 K-40 6.60E-01 2.60E-01 3.0SE-01 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 40 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 084 [ INDICATOR - NNE@ 2.58 miles]

Sample ID: 484046 Sample Dates: 9/10/2018 - 9/17/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.28E-02 O.OOE+OO 3.28E-02 Cs-134 <2.14E-02 O.OOE+OO 2.14E-02 Cs-137 <1.72E-02 O.OOE+OO 1.72E-02 Be-7 <1.22E-01 O.OOE+OO 1.22E-01 K-40 3.73E-01 1.75E-01 2.02E-01 Sample ID: 484621 Sample Dates: 9/17/2018 - 9/24/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.46E-02 O.OOE+OO 2.46E-02 C s-134 < 1.66E-02 O.OOE+OO 1.66E-02 C s-137 < 1.83E-02 O.OOE+OO 1.83E-02 Be-7 < 1.01 E-01 O.OOE+OO 1.01E-01 K-40 3.44E-01 1.75E-01 2.18E-01 Sample ID: 485046 Sample Dates: 9/24/2018

10/1/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.64E-02 O.OOE+OO 2.64E-02 Cs- 134 < 1.60E-02 0.00E+OO 1.60E-02 Cs-137 <2.01E-02 O.OOE+OO 2.01E-02 Be-7 <1 .19E-01 O.OOE+OO 1.19E-01 K-40 5.46E-01 1.90E-01 1.63E-01 Sample ID: 485509 Sample Dates: 10/1/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.04E-02 O.OOE+OO 2.04E-02 Cs-134 <1 .64E-02 O.OOE+OO 1.64E-02 Cs-137 <1.84E-02 O.OOE+OO 1.84E-02 Be-7 <1 .16E-01 O.OOE+OO 1.16E-01 K-40 4.40E-01 1.81E-01 1.94E-01 Sample ID: 486186 Sample Dates: 10/8/2018 -10/15/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .71E-02 O.OOE+OO 2.71E-02 Cs-134 < 1.77E-02 O.OOE+OO 1.77E-02 Cs-137 < 1.67E-02 O.OOE+OO 1.67E-02 Be-7 <7.33E-02 O.OOE+OO 7.33E-02 K-40 <3.79E-01 O.OOE+OO 3.79E-01 Sample ID: 486718 Sample Dates : 10/15/2018 -10/22/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.63E-02 0.00E+OO 2.63E-02 Cs-134 <1 .51 E-02 O.OOE+OO 1.51E-02 Cs-137 <1 .72E-02 0.00E+OO 1.72E-02 Be-7 <1 .13E-01 O.OOE+OO 1.13E-01 K-40 5.0BE-01 1.66E-01 3.44E-02 Sample ID: 487757 Sample Dates: 10/22/2018 -10/29/2018 Nuclide Activity 2 Sigma Error MDA 1-1 3 1 <2.29E-02 O.OOE+OO 2.29E-02 Cs- 134 < 1.BBE-02 O.OOE+OO 1.88E-02 Cs-137 < 1.94E-02 O.OOE+OO 1.94E-02 Be-7 <1 .03E-01 0.00E+OO 1.03E-01 K-40 5.35E-01 2.20E-01 2.61E-01 Sample ID: 488001 Sample Dates: 10/29/2018 -11/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.13E-02 O.OOE+OO 2.13E-02 Cs-134 < 1.24E-02 O.OOE+OO 1.24E-02 Cs-137 < 1.52E-02 O.OOE+OO 1.52E-02 Be-7 < 1.26E-01 0.00E+OO 1.26E-01 K-40 3.23E-01 1.60E-01 1.BBE-01 Sample ID: 488493 Sample Dates: 11/5/2018 -11/12/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.30E-02 0.00E+OO 2.30E-02 Cs-134 <1.89E-02 O.OOE+OO 1.89E-02 Cs-137 <1.77E-0 2 O.OOE+OO 1.77E-02 Be-7 <1 .26E-01 0.00E+OO 1.26E-01 K-40 5.51 E-01 1.95E-01 1.78E-01 Sample ID: 488872 Sample Dates : 11/12/2018 -11/19/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.SSE-02 O.OOE+OO 3.55E-02 Cs-134 < 1.86E-02 O.OOE+OO 1.86E-02 Cs-137 <2.03E-02 0.00E+OO 2.03E-02 Be-7 <1.29E-01 O.OOE+OO 1.29E-01 K-40 4.19E-01 2.14E-01 2.87E-01 Report Generated@ 5/1/2019 11:57:36 EnRad Laboratories Appendix E - Page 41 of 91 Duke Energy Annual Report

Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 084 [ INDICATOR - NNE @ 2.58 miles ]

Sample ID: 489169 Sample Dates: 11/19/2018 -11/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.03E-02 O.OOE+OO 2.03E-02 Cs-134 <1.82E-02 O.OOE+OO 1.82E-02 Cs-137 <1.SSE-02 O.OOE+OO 1.SSE-02 Be-7 <9.13E-02 O.OOE+OO 9.13E-02 K-40 6.13E-01 2.11E-01 2.03E-01 Sample ID: 489751 Sample Dates: 11/26/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.33E-02 O.OOE+OO 2.33E-02 Cs-134 < 1.43E-02 O.OOE+OO 1.43E-02 Cs-137 <1.SSE-02 O.OOE+OO 1.SSE-02 Be-7 < 1.37E-01 0.00E+OO 1.37E-01 K-40 <3. 95E-01 O.OOE+OO 3.95E-01 Sample ID: 490174 Sample Dates: 12/3/2018 -12/10/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.51 E-02 O.OOE+OO 3.51 E-02 Cs-134 <1.78E-02 O.OOE+OO 1.78E-02 Cs-137 <1.39E-02 O.OOE+OO 1.39E-02 Be-7 <1.33E-01 O.OOE+OO 1.33E-01 K-40 5.1SE-01 1.77E-01 1.19E-01 Sample ID: 490821 Sample Dates: 12/10/2018 -12/18/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.12E-02 O.OOE+OO 2.12E-02 Cs-134 <1.21E-02 O.OOE+OO 1.2 1 E-02 Cs-137 <1.04E-02 O.OOE+OO 1.04E-02 Be-7 <1.14E-01 O.OOE+OO 1.14E-01 K-40 <2.35E-01 O.OOE+OO 2.35E-01 Sample ID: 491196 Sample Dates: 12/18/2018 -12/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <4.43E-02 O.OOE+OO 4.43E-02 Cs-134 < 1.66E-02 O.OOE+OO 1.66E-02 Cs-137 < 1.31 E-02 O.OOE+OO 1.31 E-02 Be-7 <1.13E-01 0.00E+OO 1.13E-01 K-40 5.69E-01 2.02E-01 2.17E-01 Sample ID: 491497 Sample Dates: 12/26/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <4.99E-02 0.00E+OO 4 .99E-02 Cs-134 <2.31 E-02 O.OOE+OO 2.31 E-02 Cs-137 <2.12E-02 O.OOE+OO 2.12E-02 Be-7 <1.87E-01 O.OOE+OO 1.87E-01 K-40 8.34E-01 3.02E-01 3.23E-01 Sample Point 085 [INDICATOR* NNW@ 0.88 miles]

Sample ID: 465663 Sample Dates: 1/2/2018 -1/8/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.96E-02 O.OOE+OO 2.96E-02 Cs-134 <1.90E-02 O.OOE+OO 1.90E-02 Cs-137 <2.12E-02 0.00E+OO 2.12E-02 Be-7 <1.48E-01 O.OOE+OO 1.48E-01 K-40 6.35E-01 2.23E-01 1.93E-01 Sample ID: 466018 Sample Dates: 1/8/2018 -1/15/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .46E-02 O.OOE+OO 2.46E-02 Cs-134 < 1.91 E-02 O.OOE+OO 1.91 E-02 Cs-137 < 1.99E-02 O.OOE+OO 1.99E-02 Be-7 < 1.0SE-01 O.OOE+OO 1.0SE-01 K-40 5.18E-01 1.81E-01 1.49E-01 Sample ID: 466220 Sample Dates: 1/15/2018 -1/22/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.10E-02 O.OOE+OO 2.10E-02 Cs- 134 <1 .SOE-02 O.OOE+OO 1.SOE-02 Cs-137 < 1.65E-02 O.OOE+OO 1.65E-02 Be-7 < 1.09E-01 O.OOE+OO 1.09E-01 K-40 5.63E-01 1.89E-01 1.SOE-01 Sample ID: 468008 Sample Dates : 1/22/2018 -1/24/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <4.48E-02 0.00E+OO 4.48E-02 Cs-134 <2.75E-02 O.OOE+OO 2.75E-02 Cs-137 <2.36E-02 0.00E+OO 2.36E-02 Be-7 <2.0SE-01 O.OOE+OO 2.0SE-01 K-40 2.11E+OO 3.79E-01 3.41 E-01 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 42 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 085 [ INDICATOR - NNW@ 0.88 miles]

Sample ID: 466405 Sample Dates: 1/24/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .89E-02 O.OOE+OO 2.89E-02 Cs-134 <2.85E-02 0.00E+OO 2.SSE-02 Cs- 137 <2 .22E-02 O.OOE+OO 2.22E-02 Be-7 < 1.77E-01 0.00E+OO 1.77E-01 K-40 8.07E-01 2.78E-01 2.53E-01 Sample ID: 467003 Sample Dates: 1/29/2018 - 2/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .71 E-02 O.OOE+OO 2.71 E-02 Cs-134 < 1.95E-02 O.OOE+OO 1.SSE-02 Cs-137 < 1.81 E-02 O.OOE+OO 1.81 E-02 Be-7 < 1.03E-01 O.OOE+OO 1.03E-01 K-40 6.52E-01 2.18E-01 2.09E-01 Sample ID: 467355 Sample Dates: 2/5/2018 -2/12/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .14E-02 0.00E+OO 2 .14E-02 Cs-134 < 1.78E-02 O.OOE+OO 1.78E-02 Cs-137 < 1.62E-02 O.OOE+OO 1.62E-02 Be-7 < 1.43E-01 O.OOE+OO 1.43E-01 K-40 5.69E-01 1.88E-01 1.44E-01 Sample ID: 467679 Sample Dates: 2/12/2018 -2/19/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.SOE-02 O.OOE+OO 2.GOE-02 Cs-134 <2.12E-02 O.OOE+OO 2.12E-02 Cs-137 <1.44E-02 O.OOE+OO 1.44E-02 Be-7 <1.39E-01 O.OOE+OO 1.39E-01 K-40 3.62E-01 1.91 E-01 2.SOE-01 Sample ID: 468453 Sample Dates: 2/19/2018 - 2/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .15E-02 O.OOE+OO 2.1 SE-02 Cs-134 < 1.SSE-02 0.00E+OO 1.65E-02 Cs-137 < 1.67E-02 O.OOE+OO 1.67E-02 Be-7 < 1.18E-01 O.OOE+OO 1.18E-01 K-40 5.20E-01 1.68E-01 3.44E-02 Sample ID: 468781 Sample Dates : 2/26/2018 - 3/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .38E-02 O.OOE+OO 2.38E-02 Cs-134 < 1.81 E-02 0.00E+OO 1.81 E-02 Cs-137 < 1.SSE-02 O.OOE+OO 1.SSE-02 Be-7 <1.31E-01 0.00E+OO 1.31E-01 K-40 3.82E-01 1.87E-01 2.32E-01 Sample ID: 469589 Sample Dates: 3/5/2018 - 3/12/2018 Nuclide Activity 2 Sigma Error MDA 1-1 3 1 <2 .13E-02 O.OOE+OO 2.13E-02 Cs-134 < 1.71 E-02 O.OOE+OO 1.71 E-02 Cs-137 < 1.57E-02 0.00E+OO 1.57E-02 Be-7 < 1.1SE-01 O.OOE+OO 1.1SE-01 K-40 4.38E-01 1.69E-01 1.52E-01 Sample ID: 470624 Sample Dates: 3/12/2018 - 3/19/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .19E-02 O.OOE+OO 2.19E-02 Cs-134 <2.25E-02 O.OOE+OO 2.25E-02 Cs-137 <2.08E-02 0.00E+OO 2.08E-02 Be-7 <1.16E-01 O.OOE+OO 1.1SE-01 K-40 4.34E-01 1.91E-01 2.22E-01 Sample ID: 471175 Sample Dates: 3/19/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.04E-02 O.OOE+OO 2.04E-02 Cs-134 <2. 17E-02 0.00E+OO 2.17E-02 Cs-137 < 1.71E-02 O.OOE+OO 1.71E-02 Be-7 < 1.14E-01 O.OOE+OO 1.14E-01 K-40 4.64E-01 1.73E-01 1.48E-01 Sample ID: 471736 Sample Dates: 3/26/2018 - 4/2/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.92E-02 O.OOE+OO 1.92E-02 Cs-134 < 1.68E-02 O.OOE+OO 1.68E-02 Cs-137 < 1.70E-02 O.OOE+OO 1.70E-02 Be-7 < 1.25E-01 O.OOE+OO 1.25E-01 K-40 <4.43E-01 0.00E+OO 4.43E-01 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 43 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 085 [ INDICATOR - NNW@ 0.88 miles ]

Sample ID: 472533 Sample Dates: 4/2/2018 -4/9/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.49E-02 O.OOE+OO 2.49E-02 Cs-134 <1.65E-02 O.OOE+OO 1.65E-02 Cs-137 <1.52E-02 O.OOE+OO 1.52E-02 Be-7 <1.04E-01 O.OOE+OO 1.04E-01 K-40 6.40E-01 2.30E-01 2.SSE-01 Sample ID: 473002 Sample Dates: 4/9/2018 -4/16/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.35E-02 O.OOE+OO 2.35E-02 Cs-134 <1.83E-02 O.OOE+OO 1.83E-02 Cs-137 <1.77E-02 O.OOE+OO 1.77E-02 Be-7 <1.48E-01 0.00E+OO 1.48E-01 K-40 <3.62E-01 O.OOE+OO 3.62E-01 Sample ID: 473283 Sample Dates: 4/16/2018 -4/23/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.76E-02 O.OOE+OO 2.76E-02 Cs-134 < 1.49E-02 O.OOE+OO 1.49E-02 Cs-137 <1.56E-02 O.OOE+OO 1.56E-02 Be-7 <1.36E-01 O.OOE+OO 1.36E-01 K-40 5.33E-01 1.88E-01 1.68E-01 Sample ID: 473655 Sample Dates: 4/23/2018 - 4/30/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.59E-02 O.OOE+OO 2.59E-02 Cs-134 <2.01E-02 O.OOE+OO 2.01E-02 Cs- 137 <1.44E-02 O.OOE+OO 1.44E-02 Be-7 <1.17E-01 O.OOE+OO 1.17E-01 K-40 4.84E-01 1.83E-01 1.73E-01 Sample ID: 474171 Sample Dates: 4/30/2018 -5/7/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.97E-02 O.OOE+OO 1.97E-02 Cs-.134 < 1.59E-02 O.OOE+OO 1.59E-02 Cs-137 <1.87E-02 O.OOE+OO 1.87E-02 Be-7 < 1.26E-01 O.OOE+OO 1.26E-01 K-40 4.46E-01 2.11E-01 2.71 E-01 Sample ID: 474549 Sample Dates: 5/7/2018 - 5/14/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.06E-02 O.OOE+OO 2.06E-02 Cs-134 < 1.87E-02 O.OOE+OO 1.87E-02 Cs-137 <1.54E-02 O.OOE+OO 1.54E-02 Be-7 <1.15E-01 O.OOE+OO 1.15E-01 K-40 4.52E-01 1.89E-01 2.10E-01 Sample ID: 474916 Sample Dates: 5/14/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.33 E-02 O.OOE+OO 2.33E-02 Cs-134 < 1.58E-02 O.OOE+OO 1.58E-02 Cs-137 <1.72E-02 0.00E+OO 1.72E-02 Be-7 <1.15E-01 O.OOE+OO 1.15E-01 K-40 3.92E-01 1.58E-01 1.39E-01 Sample ID: 475236 Sample Dates: 5/21/2018 -5/29/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1.81E-02 O.OOE+OO 1.81 E-02 Cs-134 < 1.28E-02 0.00E+OO 1.28E-02 Cs-137 < 1.03E-02 O.OOE+OO 1.03E-02 Be-7 < 1.00E-01 0.00E+OO 1.00E-01 K-40 5.37E-01 1.62E-01 3.10E-02 Sample ID: 475557 Sample Dates: 5/29/2018 - 6/4/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.40E-02 O.OOE+OO 2.40E-02 Cs-134 <2.43E-02 O.OOE+OO 2.43E-02 Cs-137 <2.07E-02 O.OOE+OO 2.07E-02 Be-7 <1.63E-01 0.00E+OO 1.63E-01 K-40 6.40E-01 2.49E-01 2.82E-01 Sample ID: 476382 Sample Dates: 6/4/2018 - 6/11/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.12E-02 0.00E+OO 2.12E-02 Cs-134 <1.68E-02 O.OOE+OO 1.GBE-02 Cs-137 < 1.BOE-02 O.OOE+OO 1.80E-02 Be-7 <1. 16E-01 O.OOE+OO 1.16E-01 K-40 3.82E-01 1.86E-01 2.31E-01 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 44 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 085 [ INDICATOR - NNW@ 0.88 miles]

Sample ID: 477402 Sample Dates : 6/11/2018

6/18/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .42E-02 0.00E+OO 2.42E-02 Cs-134 < 1.42E-02 O.OOE+OO 1.42E-02 Cs-137 < 1.86E-02 O.OOE+OO 1.86E-02 Be-7 < 1.18E-01 O.OOE+OO 1.18E-01 K-40 5.83E-01 1.78E-01 3.44E-02 Sample ID: 478128 Sample Dates: 6/18/2018. 6/25/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .47E-02 O.OOE+OO 2.47E-02 Cs-134 < 1.54E-02 0.00E+OO 1.54E-02 Cs-137 < 1.7 1E-02 O.OOE+OO 1.71E-02 Be-7 < 1.15E-01 0.00E+OO 1.15E-01 K- 40 4.87E-01 2.02E-01 2.30E-01 Sample ID: 478444 Sample Dates: 6/25/2018 - 7/2/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <2. 03E-02 O.OOE+OO 2.03E-02 Cs-134 < 1.59E-02 O.OOE+OO 1.59E-02 Cs-137 < 1.88E-02 O.OOE+OO 1.BBE-02 Be-7 < 1.18E-01 0.00E+OO 1.18E-01 K-40 4.34E-01 1.92E-01 2.25E-01 Sample ID: 478817 Sample Dates: 7/2/2018 - 7/9/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <2.19E-02 O.OOE+OO 2.19E-02 Cs-134 < 1.BOE-02 O.OOE+OO 1.BOE-02 Cs-137 < 1.74E-02 O.OOE+OO 1.74E-02 Be-7 < 1.09E-01 0.00E+OO 1.09E-01 K-40 4.20E-01 1.95E- 01 2.40E-01 Sample ID: 479223 Sample Dates: 7/9/2018

7/16/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.40E-02 0.00E+OO 2.40E-02 Cs-134 < 1.83E-02 O.OOE+OO 1.83E-02 Cs-137 <1 .46E-02 0.00E+OO 1.46E-02 Be-7 <1.14E-01 O.OOE+OO 1.14E-01 K-40 3.87E-01 1.73E-01 1.95E-01 Sample ID: 479904 Sample Dates : 7/16/2018 - 7/23/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2 .37E-02 O.OOE+OO 2.37E-02 Cs-134 < 1.89E-02 0.00E+OO 1.89E-02 Cs- 137 <2.07E-02 O.OOE+OO 2.07E-02 Be-7 3.81E-02 7.24E- 02 1.24E-01 K-40 <3. 93E-01 O.OOE+OO 3.93E-01 Sample ID: 480267 Sample Dates: 7/23/2018

7/30/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <2. 05E-02 O.OOE+OO 2.05E-02 Cs-134 < 1.92E-02 O.OOE+OO 1.92E-02 Cs-137 < 1.78E-02 O.OOE+OO 1.78E-02 Be-7 < 1.23E-01 O.OOE+OO 1.23E-01 K-40 4.64E-01 1.67E-01 1.25E-01 Sample ID: 481094 Sample Dates : 7/30/2018 - 8/6/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.40E-02 O.OOE+OO 2.40E-02 Cs-134 < 1.35E-02 0.00E+OO 1.3 5E-02 Cs-137 <2.20E-02 0.00E+OO 2.20E-02 Be-7 < 1.33E-01 O.OOE+OO 1.33E-01 K-40 4.47E-01 1.71E-01 1.51E-01 Sample ID: 481535 Sample Dates : 8/6/2018 - 8/13/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.33E-02 O.OOE+OO 2.3 3E-02 Cs-134 <1 .58E-02 O.OOE+OO 1.58E-02 Cs-137 <1.72E-02 O.OOE+OO 1.72E-02 Be-7 <1 .13E-01 O.OOE+OO 1.13E-01 K-40 4.82E-01 1.61E-01 3.44E-02 Sample ID: 481985 Sample Dates: 8/13/2018 - 8/20/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <2.04E-02 O.OOE+OO 2.04E-02 Cs-134 < 1.21E-02 O.OOE+OO 1.21E-02 Cs-137 <1.70E-02 O.OOE+OO 1.70E-02 Be-7 <9.56E-02 O.OOE+OO 9.56E-02 K-40 <2.56E-01 0.00E+OO 2.56E-01 Report Generated@ 5/1/201911:57:36 Duke Energy Annual Report - Appendix E

<E!_)

- --- EnRad Laboratories 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 45 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 085 [ INDICATOR - NNW@ 0.88 miles]

Sample ID: 482503 Sample Dates: 8/20/2018 - 8/27/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <1.66E-02 O.OOE+OO 1.66E-02 Cs-134 <2.01E-02 0.00E+OO 2.01 E-02 Cs-137 <1.46E-02 O.OOE+OO 1.46E-02 Be-7 <9.78E-02 O.OOE+OO 9.78E-02 K-40 <2.82E-01 O.OOE+OO 2.82E-01 Sample ID: 482828 Sample Dates: 8/27/2018 - 9/4/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.61E-02 O.OOE+OO 1.61 E-02 Cs-134 < 1.33E-02 O.OOE+OO 1.33E-02 Cs-137 < 1.26E-02 O.OOE+OO 1.26E-02 Be-7 < 1.10E-01 O.OOE+OO 1.10E-01 K-40 <2.48E-01 O.OOE+OO 2.48E-01 Sample ID: 483450 Sample Dates: 9/4/2018 - 9/10/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.8SE-02 O.OOE+OO 2.8SE-02 Cs-134 < 1.74E-02 O.OOE+OO 1.74E-02 Cs-137 <1.?0E-02 O.OOE+OO 1.?0E-02 Be-7 < 1.SSE-01 0.00E+OO 1.SSE-01 K-40 S.49E-01 1.95E-01 1.42E-01 Sample ID: 484047 Sample Dates: 9/10/2018 - 9/17/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.72E-02 O.OOE+OO 2.72E-02 Cs-134 <1 .83E-02 0.00E+OO 1.83E-02 Cs-137 <1 .81E-02 O.OOE+OO 1.81 E-02 Be-7 <1 .22E-01 O.OOE+OO 1.22E-01 K-40 S.80E-01 2.0?E-01 2.0SE-01 Sample ID: 484622 Sample Dates: 9/17/2018 - 9/24/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 < 1.82E-02 O.OOE+OO 1.82E-02 C s-134 <2 .04E-02 0.00E+OO 2.04E-02 Cs-137 < 1.64E-02 O.OOE+OO 1.64E-02 Be-7 < 1.21E-01 O.OOE+OO 1.21 E-01 K-40 S.90E-01 1.80E-01 3.47E-02 Sample ID: 485047 Sample Dates: 9/24/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.82E-02 O.OOE+OO 2.82E-02 Cs-134 <1 .68E-02 O.OOE+OO 1.68E-02 Cs-137 <1.70E-02 0.00E+OO 1.?0E-02 Be-7 <1.42E-01 O.OOE+OO 1.42E-01 K-40 S.66E-01 1.77E-01 3.49E-02 Sample ID: 485510 Sample Dates : 10/1/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA 1- 13 1 <2.36E-02 O.OOE+OO 2.36E-02 C s-1 34 < 1.49E-02 0.00E+OO 1.49E-02 Cs-1 37 <1.61E-02 O.OOE+OO 1.61 E-02 Be-7 < 1.22E-01 O.OOE+OO 1.22E-01 K-40 3. 96E-01 1.?0E-01 1.81 E-01 Sample ID: 486187 Sample Dates : 10/8/2018 -10/15/2018 Nuclide Activity 2 Sigma Error MDA 1- 131 <2.52E-02 O.OOE+OO 2.52E-02 Cs-134 < 1.63E-02 O.OOE+OO 1.63E-02 Cs-137 < 1.56E-02 0.00E+OO 1.56E-02 Be-7 < 1.13E-01 O.OOE+OO 1.13E-01 K-40 5.52E-01 2.14E-01 2.38E-01 Sample ID: 486719 Sample Dates: 10/15/2018 -10/22/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.33E-02 O.OOE+OO 2.33E-02 Cs-134 <1.43E-02 O.OOE+OO 1.43E-02 Cs-137 <1.90E-02 O.OOE+OO 1.90E-02 Be-7 <9.93E-02 0.00E+OO 9.93E-02 K-40 4.40E-01 1.91 E-01 2.22E-01 Sample ID: 487758 Sample Dates : 10/22/2018 - 10/29/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.66E-02 O.OOE+OO 2.66E-02 Cs-134 < 1.61E-02 O.OOE+OO 1.61 E-02 Cs-137 <2 .10E-02 O.OOE+OO 2.10E-02 Be-7 <1 .0?E-01 O.OOE+OO 1.0?E-01 K-40 S.78E-01 2.03E-01 1.93E-01 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 46 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report- 2018 (Appendix E)

Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 085 [ INDICATOR - NNW@ 0.88 miles ]

Sample ID: 488002 Sample Dates: 10/29/2018 -11/5/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.SSE-02 0 .00E+OO 2.SSE-02 Cs-134 <1.84E-02 O.OOE+OO 1.84E-02 Cs-137 <1.74E-02 O.OOE+OO 1.74E-02 Be-7 1.84E-02 7 .34E-02 1.31E-01 K-40 5.4BE-01 1.99E-01 1.99E-01 Sample ID: 488494 Sample Dates: 11/5/2018 -11/12/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.0SE-02 O.OOE+OO 2.0SE-02 Cs-134 < 1.?0E-02 0.00E+OO 1.?0E-02 Cs-137 < 1.67E-02 O.OOE+OO 1.67E- 02 Be-7 < 1.10E-01 O.OOE+OO 1.10E-01 K-40 4.95E-01 1.90E-01 1.90E-01 Sample ID: 488873 Sample Dates : 11/12/2018 -11/19/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3 .72E-02 O.OOE+OO 3.72E- 02 Cs-134 < 1.79E-02 O.OOE+OO 1.79E-02 Cs-137 < 1.63E-02 O.OOE+OO 1.63E-02 Be-7 < 1.19E-01 0.00E+OO 1.19E-01 K-40 4.36E-01 1.74E-01 1.71E-01 Sample ID: 489170 Sample Dates: 11/19/2018 -11/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 < 1.BSE-02 O.OOE+OO 1.BSE-02 Cs-134 < 1.BBE-02 O.OOE+OO 1.BBE-02 Cs-137 < 1.BSE-02 O.OOE+OO 1.BSE-02 Be-7 < 1.42E-01 O.OOE+OO 1.42E-01 K-40 5.33E-01 2.11E-01 2.39E-01 Sample ID: 489752 Sample Dates: 11/26/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <2.44E-02 0.00E+OO 2.44E-02 Cs-134 < 1.24E-02 O.OOE+OO 1.24E-02 Cs-137 < 1.52E-02 0 .00E+OO 1.52E-02 Be-7 < 1.27E-01 O.OOE+OO 1.27E-01 K-40 4 .26E-01 1.83E-01 2 .04E-01 Sample ID: 490175 Sample Dates: 12/3/2018 -12/10/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.11E-02 O.OOE+OO 3.11 E-02 Cs-134 < 1.74E-02 O.OOE+OO 1.74E-02 Cs-137 < 1.69E-02 O.OOE+OO 1.69E-02 Be-7 < 1.20E-01 0.00E+OO 1.20E-01 K-40 4 .98E-01 1.87E-01 1.BOE-01 Sample ID: 490822 Sample Dates: 12/10/2018 -12/18/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3.36E-02 O.OOE+OO 3.36E-02 Cs-134 < 1.34E-02 O.OOE+OO 1.34E-02 Cs-137 <1.42E-02 O.OOE+OO 1.42E-02 Be-7 <1.01E-01 O.OOE+OO 1.01E-01 K-40 <2.75E-01 O.OOE+OO 2.75E-01 Sample ID: 491197 Sample Dates: 12/18/2018 -12/26/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <3 .91E-02 O.OOE+OO 3.91 E-02 Cs-134 <1.48E-02 O.OOE+OO 1.4BE-02 Cs-137 <1.53E-02 0.00E+OO 1.53E-02 Be-7 <1.18E-01 O.OOE+OO 1.18E-01 K-40 <2.99E-01 0.00E+OO 2.99E-01 Sample ID: 491498 Sample Dates: 12/26/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA 1-131 <4.11E-02 O.OOE+OO 4 .11E-02 Cs-134 <2.41E-02 0.00E+OO 2.41E-02 Cs- 137 <2 .59E-02 O.OOE+OO 2.59E-02 Be-7 <2.25E-01 O.OOE+OO 2.25E-01 K-40 5.29E-01 2.36E-01 2.SOE-01 Media Type: DRINKING WATER Concentration (Activity): pCi/1 Sample Point 060 [INDICATOR* NE@ 3.23 miles]

Sample ID: 466681 Sample Dates : 1/2/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.02E+OO 6.79E-01 1.10E+OO Mn-54 <2.00E+OO 0.00E+OO 2.00E+OO Co-58 <2.42E+OO O.OOE+OO 2.42E+OO Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 47 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville. North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: DRINKING WATER Concentration (Activity): pCi/1 Sample Point 060 [ INDICATOR - NE @ 3.23 miles ]

Sample ID: 466681 Sample Dates: 1/2/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA Fe-59 <5.27E+OO O.OOE+OO 5.27E+OO Co-60 <3.15E+OO O.OOE+OO 3.15E+OO Zn-65 <7.73E+OO O.OOE+OO 7.73E+OO Zr-95 <6.15E+OO O.OOE+OO 6.15E+OO

Nb-95 <4.40E+OO 0.00E+OO 4.40E+OO 1-131 <1.18E+01 O.OOE+OO 1.18E+01 Cs-134 <3.07E+OO O.OOE+OO 3.07E+OO Cs-137 <3.14E+OO O.OOE+OO 3.14E+OO Bala-140 <1.06E+01 0.00E+OO 1.06E+01 Be-7 <2.44E+01 O.OOE+OO 2.44E+01 K-40 <4.84E+01 O.OOE+OO 4.84E+01 Sample ID: 468536 Sample Dates: 1/29/2018 - 2/26/2018 Nuclide Activity 2 Sigma Error MDA Beta < 1.03E-01 O.OOE+OO 1.26E+OO Mn-54 <3.24E+OO O.OOE+OO 3.24E+OO Co-58 <3.48E+OO O.OOE+OO 3.48E+OO Fe-59 <5 .SOE+OO O.OOE+OO 5.SOE+OO Co-60 <2.60E+OO O.OOE+OO 2.60E+OO Zn-65 <6.22E+OO 0.00E+OO 6.22E+OO Zr-95 <5.78E+OO O.OOE+OO 5.78E+OO Nb-95 <4.0SE+OO 0.00E+OO 4.0SE+OO 1-131 <1.18E+01 O.OOE+OO 1.18E+01 Cs-134 <2.38E+OO O.OOE+OO 2.38E+OO Cs-137 <3.57E+OO O.OOE+OO 3.57E+OO Bala-140 <6.20E+OO O.OOE+OO 6.20E+OO Be-7 <2.40E+01 O.OOE+OO 2.40E+01 K-40 3.54E+01 2.49E+01 3.64E+01 Sample ID: 471524 Sample Dates: 2/26/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA Beta <3.10E-01 0.00E+OO 1.41E+OO Mn-54 <1 .65E+OO O.OOE+OO 1.65E+OO Co-58 <2.17E+OO 0.00E+OO 2.17E+OO Fe-59 <4.06E+OO O.OOE+OO 4.06E+OO Co-60 <2.07E+OO O.OOE+OO 2.07E+OO Zn-65 <3.87E+OO O.OOE+OO 3.87E+OO Zr-95 <4.88E+OO O.OOE+OO 4.88E+OO Nb-95 <2.81E+OO 0.00E+OO 2.81E+OO 1-131 <1.20E+01 O.OOE+OO 1.20E+01 Cs-134 <2.44E+OO O.OOE+OO 2.44E+OO Cs-137 <1.89E+OO O.OOE+OO 1.89E+OO Bala-140 <6.39E+OO O.OOE+OO 6.39E+OO Be-7 <1.99E+01 O.OOE+OO 1.99E+01 K-40 4.54E+01 2.00E+01 2.62E+01 Sample ID: 467532 Sample Dates: 1/2/2018 - 4/23/2018 Nuclide Activity 2 Sigma Error MDA H3DW <6.64E+01 O.OOE+OO 1.82E+02 Sample ID: 473436 Sample Dates: 3/26/2018 -4/23/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.53E+OO 7.83E-01 1.24E+OO Mn-54 <2.37E+OO O.OOE+OO 2.37E+OO Co-58 <2.66E+OO 0.00E+OO 2.66E+OO Fe-59 <6.39E+OO O.OOE+OO 6.39E+OO Co-60 <2.89E+OO O.OOE+OO 2.89E+OO Zn-65 <6.76E+OO O.OOE+OO 6.76E+OO Zr-95 <5.09E+OO O.OOE+OO 5.09E+OO Nb-95 <3.27E+OO 0.00E+OO 3.27E+OO 1-131 <1.20E+01 O.OOE+OO 1.20E+01 Cs-134 <2.83E+OO O.OOE+OO 2.83E+OO Cs-137 <2.64E+OO O.OOE+OO 2.64E+OO Bala-140 <7.6 5E+OO 0.00E+OO 7.65E+OO Be-7 <2. 85E+01 O.OOE+OO 2.85E+01 K-40 <5.1 6E+01 0.00E+OO 5.1 6E+01 Sample ID: 475000 Sample Dates : 4/23/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA Beta <3.86E-01 O.OOE+OO 1.15E+OO Mn-54 <3.94E+OO O.OOE+OO 3.94E+OO Co-58 <4.81E+OO O.OOE+OO 4.81E+OO Fe-59 <9.88E+OO O.OOE+OO 9.88E+OO Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 48 of 91 Duke Energy Annual Report - Appendix E

<E~~ 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: DRINKING WATER Concentration (Activity): pCi/1 Sample Point 060 [ INDICATOR - NE @ 3.23 miles ]

Sample ID: 475000 Sample Dates: 4/23/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA Co-60 <3.57E+OO O.OOE+OO 3.57E+OO Zn-65 <1.11E+01 O.OOE+OO 1.11E+01 Zr-95 <7.77E+OO O.OOE+OO 7.77E+OO Nb-95 <4.3SE+OO O.OOE+OO 4.3SE+OO 1-131 <1.13E+01 0.00E+OO 1.13E+01 Cs-134 <4.36E+OO O.OOE+OO 4.36E+OO Cs-137 <4.00E+OO O.OOE+OO 4.00E+OO Bala-140 <8.61E+OO O.OOE+OO 8.61E+OO Be-7 <2.54E+01 O.OOE+OO 2.54E+01 K-40 4.35E+01 3.35E+01 4.71 E+01 Sample ID: 477663 Sample Dates: 5/21/2018 - 6/18/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.29E+OO 8.93E-01 1.46E+OO Mn-54 <2.36E+OO O.OOE+OO 2.36E+OO Co-58 <2.94E+OO O.OOE+OO 2.94E+OO Fe-59 <6.49E+OO O.OOE+OO 6.49E+OO Co-60 <2.BSE+OO 0.00E+OO 2.BSE+OO Zn-65 <5.27E+OO O.OOE+OO 5.27E+OO Zr-95 <3.51E+OO O.OOE+OO 3.51 E+OO Nb-95 <3.0BE+OO O.OOE+OO 3.0SE+OO 1-131 <1.07E+01 O.OOE+OO 1.07E+01 Cs-134 <3.46E+OO 0.00E+OO 3.46E+OO Cs-137 <2.39E+OO O.OOE+OO 2.39E+OO Bala-140 <8.42E+OO O.OOE+OO 8.42E+OO Be-7 <2.27E+01 O.OOE+OO 2.27E+01 K-40 5.17E+01 2.65E+01 3.42E+01 Sample ID: 474729 Sample Dates: 4/23/2018 - 7/16/2018 Nuclide Activity 2 Sigma Error MDA H3DW <-1.2E+01 O.OOE+OO 1.9SE+02 Sample ID: 479531 Sample Dates: 6/18/2018 - 7/16/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.SBE+OO 9.1 4E-01 1.39E+OO Mn-54 <2.67E+OO O.OOE+OO 2.67E+OO Co-58 <3 .35E+OO 0.00E+OO 3.35E+OO Fe-59 <6. 34E+OO O.OOE+OO 6.34E+OO Co-60 <2.79E+OO O.OOE+OO 2.79E+OO Zn-65 <5.90E+OO O.OOE+OO 5.90E+OO Zr-95 <5.73E+OO O.OOE+OO 5.73E+OO Nb-95 <3.90E+OO O.OOE+OO 3.90E+OO 1-131 <1.19E+01 O.OOE+OO 1.19E+01 Cs-134 <3.57E+OO O.OOE+OO 3.57E+OO Cs-137 <2.92E+OO 0.00E+OO 2.92E+OO Bala-140 <7.12E+OO O.OOE+OO 7.12E+OO Be-7 <2.36E+01 0.00E+OO 2.36E+01 K-40 3.04E+01 2.54E+01 3.S0E+01 Sample ID: 481631 Sample Dates: 7/16/2018 -8/13/2018 Nuclide Activity 2 Sigma Error MDA Beta <4.73E-01 0.00E+OO 1.21 E+OO Mn-54 <3.10E+OO O.OOE+OO 3.10E+OO Co-58 <2.95E+OO O.OOE+OO 2.95E+OO Fe-59 <7.03E+OO O.OOE+OO 7.03E+OO Co-60 <3.2 1E+OO O.OOE+OO 3.21E+OO Zn-65 <5. 02E+OO O.OOE+OO 5.02E+OO Zr-95 <5.99E+OO O.OOE+OO 5.99E+OO Nb-95 <4.15E+OO O.OOE+OO 4.15E+OO 1-131 <1.17E+01 O.OOE+OO 1.17E+01 Cs-134 <1.93E+OO 0.00E+OO 1.93E+OO Cs-137 <2.12E+OO O.OOE+OO 2.12E+OO Bala-140 <6.0BE+OO 0.00E+OO 6.0BE+OO Be-7 <2. 17E+01 O.OOE+OO 2.17E+01 K-40 <3 .95E+01 0.00E+OO 3.95E+01 Sample ID: 483534 Sample Dates: 8/13/2018 - 9/10/2018 Nuclide Activity 2 Sigma Error MDA Beta <-6.7E-02 O.OOE+OO 1.2SE+OO Mn-54 <3.49E+OO O.OOE+OO 3.49E+OO Co-58 <2.S1E+OO O.OOE+OO 2.81 E+OO Fe-59 <7.37E+OO O.OOE+OO 7.37E+OO Co-60 <2 .06E+OO O.OOE+OO 2.06E+OO Report Generated@ 5/1/2019 11 :57:36 Duke Energy Annual Report - Appendix E (En_)- --- EnRad Laboratories 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 49 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: DRINKING WATER Concentration (Activity): pCi/1 Sample Point 060 [ INDICATOR - NE @ 3.23 miles J Sample ID: 483534 Sample Dates: 8/13/2018 - 9/10/2018 Nuclide Activity 2 Sigma Error MDA Zn-65 <7.29E+OO O.OOE+OO 7.29E+OO Zr-95 <5.86E+OO O.OOE+OO 5.86E+OO Nb-95 <4.63E+OO O.OOE+OO 4.63E+OO 1-131 <1.17E+01 0.00E+OO 1.17 E+01 Cs-134 <4.20E+OO

O.OOE+OO 4.20E+OO Cs-137 <3.94E+OO O.OOE+OO 3.94E+OO BaLa-140 <1.16E+01 O.OOE+OO 1.16E+01 Be-7 <2 .76E+01 O.OOE+OO 2.76E+01 K-40 <7.59E+01 O.OOE+OO 7.59E+01 Sample ID: 481634 Sample Dates: 7/16/2018 - 10/8/2018 Nuclide Activity 2 Sigma Error MDA H3DW <O.OOE+OO O.OOE+OO 1.83E+02 Sample ID: 485853 Sample Dates : 9/10/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.56E+OO 7.31E-01 1.15E+OO Mn-54 <4.30E+OO 0.00E+OO 4.30E+OO Co-58 <3.77E+OO O.OOE+OO 3.77E+OO Fe-59 <6 .81E+OO O.OOE+OO 6.81E+OO Co-60 <3.44E+OO O.OOE+OO 3.44E+OO Zn-65 <3 .88E+OO 0.00E+OO 3.88E+OO Zr-95 <6 .33E+OO O.OOE+OO 6.33E+OO Nb-95 <4.85E+OO O.OOE+OO 4.85E+OO 1-131 <1.14E+01 O.OOE+OO 1.14E+01 Cs-134 <3.95E+OO O.OOE+OO 3.95E+OO Cs-1 37 <4.29E+OO O.OOE+OO 4.29E+OO BaLa-140 <5. 89E+OO O.OOE+OO 5.89E+OO Be-7 <3. 57E+01 0.00E+OO 3.57E+01 K-40 <5. 88E+01 O.OOE+OO 5.88E+01 Sample ID: 488201 Sample Dates : 10/8/2018 -11/5/2018 .Nuclide Activity 2 Sigma Error MDA Beta <3.97E-01 O.OOE+OO 1.26E+OO Mn-54 <3.26E+OO O.OOE+OO 3.26E+OO Co-58 <3.63E+OO 0.00E+OO 3.63E+OO Fe-59 <6.91E+OO O.OOE+OO 6.91E+OO Co-60 <4.11E+OO O.OOE+OO 4.11E+OO Zn-65 <8.SOE+OO O.OOE+OO 8.SOE+OO Zr-95 <6.04E+OO O.OOE+OO 6.04E+OO Nb-95 <3.56E+OO O.OOE+OO 3.56E+OO 1-13 1 <1 .18E+01 O.OOE+OO 1.18E+01 Cs-134 <4.54E+OO O.OOE+OO 4.54E+OO Cs-137 <3.34E+OO O.OOE+OO 3.34E+OO BaLa-140 <9.73E+OO 0.00E+OO 9.73E+OO Be-7 <3.52E+01 O.OOE+OO 3.52E+01 K-40 <6 .32E+01 O.OOE+OO 6.32E+01 Sample ID: 490030 Sample Dates : 11/5/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.04E+OO 8.22E-01 1.35E+OO Mn-54 <2.35E+OO 0.00E+OO 2.35E+OO Co-58 <2.70E+OO O.OOE+OO 2.70E+OO Fe-59 <4.90E+OO O.OOE+OO 4.90E+OO Co-60 <2.32E+OO O.OOE+OO 2.32E+OO Zn-65 <4.29E+OO O.OOE+OO 4. 29E+OO Zr-95 <5.71E+OO O.OOE+OO 5.71E+OO Nb-95 <3.22E+OO O.OOE+OO 3.22E+OO 1-131 <1.07E+01 O.OOE+OO 1.07E+01 Cs-134 <2.67E+OO O.OOE+OO 2.67E+OO Cs-137 <2.21E+OO 0.00E+OO 2.21E+OO BaLa-140 <6.96E+OO O.OOE+OO 6.96E+OO Be-7 <2 .72E+01 0.00E+OO 2.72E+0 1 K-40 6.94E+01 2.97E+01 3.94E+01 Sample ID: 488747 Sample Dates: 10/8/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA H3DW <5.70E+01 0.00E+OO 1.87E+02 Sample ID: 491615 Sample Dates : 12/3/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <8.38E-01 O.OOE+OO 8.38E-01 Co-58 <8.75E-01 O.OOE+OO 8.75E-01 Fe-59 <1.95E+OO O.OOE+OO 1.95E+OO Co-60 <7.47E-01 O.OO E+OO 7.47E-01 Report Generated @ 5/1/2019 11 :57:36 Duke Energy Annual Report - Appendix E ~Jn ~ EnRad Laboratories 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 50 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: DRINKING WATER Concentration (Activity): pCi/1 Sample Point 060 [ INDICATOR - NE @ 3.23 miles ]

Sample ID: 491615 Sample Dates: 12/3/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Zn-65 <1.52E+OO O.OOE+OO 1.52E+OO Zr-95 <1.66E+OO 0.00E+OO 1.66E+OO Nb-95 <1.18E+OO O.OOE+OO 1.18E+OO 1-131 <7.63E+OO 0.00E+OO 7.63E+OO Cs-134 <8.68E-01 O.OOE+OO 8.68E-01 Cs-137 <6.98E-01 0.00E+OO 6.98E-01 BaLa-140 <3.41E+OO O.OOE+OO 3.41E+OO Be-7 <7.58E+OO 0.00E+OO 7.58E+OO K-40 2.67E+01 8.68E+OO 1.23E+01 Beta <2.78E+OO 0.00E+OO 2.78E+OO Sample Point 064 [ CONTROL - SSW @ 6.67 miles ]

Sample ID: 466682 Sample Dates : 1/2/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.25E+OO 6.94E-01 1.11E+OO Mn-54 <2.78E+OO O.OOE+OO 2.78E+OO Co-58 <2.66E+OO 0.00E+OO 2.66E+OO Fe-59 <6.34E+OO O.OOE+OO 6.34E+OO Co-60 <2.81E+OO O.OOE+OO 2.81E+OO Zn-65 <6.25E+OO 0.00E+OO 6.25E+OO Zr-95 <6.13E+OO O.OOE+OO 6.13E+OO Nb-95 <3.46E+OO O.OOE+OO 3.46E+OO 1-131 <1.18E+01 O.OOE+OO 1.18E+01 Cs-134 <2.32E+OO 0.00E+OO 2.32E+OO Cs-137 <3.21E+OO O.OOE+OO 3.21E+OO BaLa-140 <7.09E+OO O.OOE+OO 7.09E+OO Be-7 <2.35E+01 O.OOE+OO 2.35E+01 K-40 3.17E+01 2.26E+01 3.11E+01 Sample ID: 468537 Sample Dates: 1/29/2018 - 2/26/2018 Nuclide Activity 2 Sigma Error MDA Beta <2.74E-01 O.OOE+OO 1.26E+OO Mn-54 <3.02E+OO 0.00E+OO 3.02E+OO Co-58 <3 .19E+OO O.OOE+OO 3.19E+OO Fe-59 <6.65E+OO 0.00E+OO 6.65E+OO Co-60 <2.48E+OO O.OOE+OO 2.48E+OO Zn-65 <5.82E+OO 0.00E+OO 5.82E+OO Zr-95 <4.91E+OO O.OOE+OO 4.91E+OO Nb-95 <3.96E+OO O.OOE+OO 3.96E+OO 1-131 <1.19E+01 O.OOE+OO 1.19E+01 Cs-134 <3. 0SE+OO O.OOE+OO 3.0SE+OO Cs-137 <2.48E+OO O.OOE+OO 2.48E+OO BaLa-140 <8.00E+OO 0.00E+OO 8.00E+OO Be-7 <3 .06E+01 O.OOE+OO 3.06E+01 K-40 5.17E+01 2.63E+01 3.29E+01 Sample ID: 471525 Sample Dates: 2/26/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.20E+OO 8.70E-01 1.42E+OO Mn-54 <1.76E+OO 0.00E+OO 1.76E+OO Co-58 <1.91E+OO 0.00E+OO 1.91 E+OO Fe-59 <3 .44E+OO O.OOE+OO 3.44E+OO Co-60 <1.69E+OO O.OOE+OO 1.69E+OO Zn-65 <3.24E+OO O.OOE+OO 3.24E+OO Zr-95 <2. 98E+OO 0.00E+OO 2.98E+OO Nb-95 <2. 13E+OO O.OOE+OO 2.13E+OO 1-131 <1.15E+01 0.00E+OO 1.15E+01 Cs-134 <1.79E+OO O.OOE+OO 1.79E+OO Cs-137 <1.76E+OO O.OOE+OO 1.76E+OO BaLa-140 <5.38E+OO 0.00E+OO 5.38E+OO Be-7 <1.70E+01 O.OOE+OO 1.70E+01 K-40 2.62E +01 1.41E+01 1.99E+01 Sample ID: 467533 Sample Dates : 1/2/2018 -4/23/2018 Nuclide Activity 2 Sigma Error MDA H3DW <1.19E+01 O.OOE+OO 1.82E+02 Sample ID: 473437 Sample Dates: 3/26/2018 - 4/23/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.32E+OO 8.27E- 01 1.25E+OO Mn-54 <3.21E+OO 0.00E+OO 3.21 E+OO Co-58 <2.94E+OO O.OOE+OO 2.94E+OO Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 51 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 {Appendix E)

Media Type: DRINKING WATER Concentration (Activity): pCi/1 Sample Point 064 [ CONTROL - SSW@ 6.67 miles ]

Sample ID: 473437 Sample Dates: 3/26/2018 - 4/23/2018 Nuclide Activity 2 Sigma Error MDA Fe-59 <6.27E+OO O.OOE+OO 6.27E+OO Co-60 <3.66E+OO O.OOE+OO 3.66E+OO Zn-65 <6.11E+OO O.OOE+OO 6.11 E+OO Zr-95 <6.82E+OO O.OOE+OO 6.82E+OO Nb-95 <3.98E+OO O.OOE+OO 3.98E+OO 1-131 <1.13E+01 O.OOE+OO 1.13E+01 Cs-134 <3 .56E+OO O.OOE+OO 3.56E+OO Cs-137 <2.77E+OO O.OOE+OO 2.77E+OO Bala-140 <1.05E+01 O.OOE+OO 1.05E+01 Be-7 <2.93E+01 O.OOE+OO 2.93E+01 K-40 5.20E+01 2.67E+01 3.18E+01 Sample ID: 475001 Sample Dates : 4/23/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA Beta 9.77E-01 7.13E-01 1.16E+OO Mn-54 <2.51E+OO O.OOE+OO 2.51E+OO Co-58 <2.92E+OO O.OOE+OO 2.92E+OO Fe-59 <7.36E+OO O.OOE+OO 7.36E+OO Co-60 <3.20E+OO O.OOE+OO 3.20E+OO Zn-65 <5.58E+OO O.OOE+OO 5.SBE+OO Zr-95 <5.60E+OO O.OOE+OO 5.60E+OO Nb-95 <3.57E+OO O.OOE+OO 3.57E+OO 1-131 <1 .14E+01 O.OOE+OO 1.14E+01 Cs-134 <3.14E+OO O.OOE+OO 3.14E+OO Cs-137 <2.74E+OO 0.00E+OO 2.74E+OO Bala-140 <8.13E+OO O.OOE+OO 8.13E+OO Be-7 <3 .23E+01 O.OOE+OO 3.23E+01 K-40 1.51E+01 2.71E+01 4.62E+01 Sample ID: 477664 Sample Dates : 5/21/2018 -6/18/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.31E+OO . 8.96E-01 1.46E+OO Mn-54 <2.74E+OO O.OOE+OO 2.74E+OO Co-58 <2.66E+OO O.OOE+OO 2.66E+OO Fe-59 <6.57E+OO 0.00E+OO 6.57E+OO Co-60 <2.16E+OO O.OOE+OO 2.16E+OO Zn-65 <4.SOE+OO O.OOE+OO 4.SOE+OO Zr-95 <5 .34E+OO O.OOE+OO 5.34E+OO Nb-95 <3 .45E+OO O.OOE+OO 3.45E+OO 1-131 <1 .03E+01 O.OOE+OO 1.03E+01 Cs-134 <2.BSE+OO 0.00E+OO 2.BSE+OO Cs-137 <2.40E+OO O.OOE+OO 2.40E+OO Bala-140 <6.40E+OO O.OOE+OO 6.40E+OO Be-7 <2 .08E+01 O.OOE+OO 2.08E+01 K-40 5.05E+01 3.14E+01 4.74E+01 Sample ID: 474730 Sample Dates: 4/23/2018 - 7/16/2018 Nuclide Activity 2 Sigma Error MDA H3DW <-2.9E+01 0.00E+OO 1.97E+02 Sample ID: 479532 Sample Dates: 6/18/2018 -7/16/2018 Nuclide Activity 2 Sigma Error MDA Beta 8.07E-01 8.34E-01 1.39E+OO Mn-54 <2.69E+OO O.OOE+OO 2.69E+OO Co-58 <3.18E+OO O.OOE+OO 3.18E+OO Fe-59 <6.11 E+OO O.OOE+OO 6.11E+OO Co-60 <2.43E+OO O.OOE+OO 2.43E+OO Zn-65 <4.81E+OO 0.00E+OO 4.81 E+OO Zr-95 <5.48E+OO O.OOE+OO 5.48E+OO Nb-95 <4.49E+OO O.OOE+OO 4.49E+OO 1-131 <1.0BE+01 0.00E+OO 1.0BE+01 Cs-134 <3.75E+OO O.OOE+OO 3.75E+OO Cs-137 <2.51E+OO O.OOE+OO 2.51E+OO Bala-140 <6.84E+OO O.OOE+OO 6.84E+OO Be-7 <2 .23E+01 0.00E+OO 2.23E+01 K-40 8.61E+01 3.20E+01 3.54E+01 Sample ID: 481632 Sample Dates: 7/16/2018 - 8/13/2018 Nuclide Activity 2 Sigma Error MDA Beta 6.83E-01 7.28E-01 1.21 E+OO Mn-54 <2.34E+OO O.OOE+OO 2.34E+OO Co-58 <2.62E+OO O.OOE+OO 2.62E+OO Fe-59 <5.14E+OO O.OOE+OO 5.14E+OO Report Generated @ 5/1/2019 11 :57:36 Duke Energy Annual Report - Appendix E En::> EnRad Laboratories 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 52 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: DRINKING WATER Concentration (Activity): pCi/1 Sample Point 064 [ CONTROL - SSW@ 6.67 miles]

Sample ID: 481632 Sample Dates: 7/16/2018 - 8/13/2018 Nuclide Activity 2 Sigma Error MDA Co-60 <2.45E+OO O.OOE+OO 2.45E+OO Zn-65 <5.18E+OO O.OOE+OO 5.18E+OO Zr-95 <4.SSE+OO O.OOE+OO 4.55E+OO Nb-95 <3.38E+OO 0.00E+OO 3.38E+OO 1-131 <1.0BE+01 O.OOE+OO 1.0BE+01 Cs-134 <2.40E+OO 0.00E+OO 2.40E+OO Cs-137 <2.20E+OO O.OOE+OO 2.20E+OO Bala-140 <7.04E+OO O.OOE+OO 7.04E+OO Be-7 <2.33E+01 O.OOE+OO 2.33E+01 K-40 6.6BE+01 3.24E+01 4.62E+01 Sample ID: 483535 Sample Dates : 8/13/2018 -9/10/2018 Nuclide Activity 2 Sigma Error MDA Beta <1.45E-01 O.OOE+OO 1.43E+OO Mn-54 <1.89E+OO O.OOE+OO 1.89E+OO Co-58 <2.61E+OO 0.00E+OO 2.61E+OO Fe-59 <5.09E+OO O.OOE+OO 5.09E+OO Co-60 <2.13E+OO O.OOE+OO 2.13E+OO Zn-65 <4.53E+OO O.OOE+OO 4.53E+OO Zr-95 <4.63E+OO 0.00E+OO 4.63E+OO Nb-95 <3.23E+OO O.OOE+OO 3.23E+OO 1-131 <1.19E+01 0.00E+OO 1.19E+01 Cs-134 <2.32E+OO O.OOE+OO 2.32E+OO Cs-137 <2.33E+OO O.OOE+OO 2.33E+OO Bala-140 <5.12E+OO O.OOE+OO 5.12E+OO Be-7 <2.26E+01 0.00E+OO 2.26E+01 K-40 6.04E+01 2.30E+01 2.73E+01 Sample ID: 481635 Sample Dates : 7/16/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA H3DW <7 .32E+01 O.OOE+OO 1.86E+02 Sample ID: 485854 Sample Dates: 9/10/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA Beta <4.63E-01 O.OOE+OO 1.15E+OO Mn-54 <3.47E+OO 0.00E+OO 3.47E+OO Co-58 <2.52E+OO O.OOE+OO 2.52E+OO Fe-59 <6 .84E+OO 0.00E+OO 6.84E+OO Co-60 <2.46E+OO O.OOE+OO 2.46E+OO Zn-65 <7.04E+OO 0.00E+OO 7.04E+OO Zr-95 <6.86E+OO O.OOE+OO 6.86E+OO Nb-95 <3.93E+OO 0.00E+OO 3.93E+OO 1-131 <1.02E+01 O.OOE+OO 1.02E+01 Cs-134 <3.60E+OO O.OOE+OO 3.60E+OO Cs-137 <2.79E+OO O.OOE+OO 2.79E+OO Bala-140 <5 .99E+OO 0.00E+OO 5.99E+OO Be-7 <2.26E+01 O.OOE+OO 2.26E+01 K-40 2.72E+01 2.13E+01 2.97E+01 Sample ID: 488202 Sample Dates: 10/8/2018 -11/5/2018 Nuclide Activity 2 Sigma Error MDA Beta <2.22E-01 O.OOE+OO 1.26E+OO Mn-54 <2.14E+OO O.OOE+OO 2.14E+OO Co-58 <3.38E+OO 0.00E+OO 3.38E+OO Fe-59 <6.SSE+OO O.OOE+OO 6.SSE+OO Co-60 <2.48E+OO 0.00E+OO 2.48E+OO Zn-65 <6 .SBE+OO O.OOE+OO 6.SBE+OO Zr-95 <5 .29E+OO O.OOE+OO 5.29E+OO Nb-95 <3.36E+OO O.OOE+OO 3.36E+OO 1-131 <1 .20E+01 O.OOE+OO 1.20E+01 Cs-134 <2.SOE+OO 0.00E+OO 2.SOE+OO Cs-137 <3.02E+OO O.OOE+OO 3.02E+OO Bala-140 <7.4BE+OO 0.00E+OO 7.4BE+OO Be-7 <2. 38E+01 O.OOE+OO 2.38E+01 K-40 <4.7BE+01 0.00E+OO 4.78E+01 Sample ID: 490031 Sample Dates : 11/5/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.59E+OO 8.57E-01 1.37E+OO Mn-54 <2.98E+OO O.OOE+OO 2.98E+OO Co-58 <2 .84E+OO 0.00E+OO 2.84E+OO Fe-59 <5.SSE+OO O.OOE+OO 5.SSE+OO Co-60 <3 .01E+OO O.OOE+OO 3.01E+OO EnRad Laboratories Report Generated@ 5/1/2019 11 :57:36 Duke Energy Annual Report - Appendix E , Eg

__) 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 53 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: DRINKING WATER Concentration (Activity): pCi/1 Sample Point 064 [ CONTROL

SSW@ 6.67 miles]

Sample ID: 490031 Sample Dates: 11/5/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA Zn-65 <6.23E+OO O.OOE+OO 6.23E+OO Zr-95 <5.04E+OO 0.00E+OO 5.04E+OO Nb-95 <2.77E+OO O.OOE+OO 2.77E+OO 1-131 <1.10E+01 O.OOE+OO 1.10E+01 Cs-134 <3.30E+OO O.OOE+OO 3.30E+OO Cs-137 <2.51E+OO O.OOE+OO 2.51 E+OO Bala-140 <9.78E+OO 0.00E+OO 9.7BE+OO Be-7 <2.BOE+01 O.OOE+OO 2.BOE+01 K-40 5.68E+01 2.79E+01 3.64E+01 Sample ID: 488748 Sample Dates: 10/8/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA H3DW <4.75E+01 O.OOE+OO 1.87E+02 Sample ID: 491616 Sample Dates : 12/3/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <1.35E+OO O.OOE+OO 1.35E+OO Co-58 <1.57E+OO 0.00E+OO 1.57E+OO Fe-59 <2.92E+OO O.OOE+OO 2.92E+OO Co-60 <1 .34E+OO 0.00E+OO 1.34E+OO Zn-65 <2.89E+OO O.OOE+OO 2.89E+OO Zr-95 <2.72E+OO O.OOE+OO 2.72E+OO Nb-95 <1.75E+OO O.OOE+OO 1.75E+OO 1-131 <1.20E+01 O.OOE+OO 1.20E+01 Cs-134 <1.57E+OO O.OOE+OO 1.57E+OO Cs-137 <1.24E+OO O.OOE+OO 1.24E+OO Bala-140 <5.41E+OO 0.00E+OO 5.41 E+OO Be-7 <1.51E+01 O.OOE+OO 1.51E+01 K-40 2.96E+01 1.30E+01 1.B1E+01 Bela <3.10E+OO O.OOE+OO 3.10E+OO Sample Point 066 [INDICATOR* SSE@ 18.9 miles]

Sample ID: 466683 Sample Dates: 1/2/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.99E+OO 7.40E-01 1.13E+OO Mn-54 <3.61E+OO 0.00E+OO 3.61 E+OO Co-58 <3.79E+OO O.OOE+OO 3.79E+OO Fe-59 <9.SOE+OO 0.00E+OO 9.50E+OO Co-60 <3.97E+OO O.OOE+OO 3.97E+OO Zn-65 <7.89E+OO 0.00E+OO 7.89E+OO Zr-95 <4.83E+OO O.OOE+OO 4.83E+OO Nb-95 <3.41E+OO O.OOE+OO 3.41 E+OO 1-131 <1.14E+01 O.OOE+OO 1.14E+01 Cs-134 <3.3 1E+OO 0.00E+OO 3.31 E+OO Cs-137 <4.58E+OO O.OOE+OO 4.58E+OO Bala-140 <8.97E+OO 0.00E+OO 8.97E+OO Be-7 <3.89E+01 O.OOE+OO 3.89E+01 K-40 <6.22E+01 O.OOE+OO 6.22E+01 Sample ID: 468538 Sample Dates: 1/29/2018. 2/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.48E+OO 8.06E-01 1.29E+OO Mn-54 <3.59E+OO 0.00E+OO 3.59E+OO Co-58 <3.40E+OO O.OOE+OO 3.40E+OO Fe-59 <8.72E+OO O.OOE+OO B.72E+OO Co-60 <4.BOE+OO O.OOE+OO 4.BOE+OO Zn-65 <7. 50E+OO 0.00E+OO 7.50E+OO Zr-95 <4.61E+OO O.OOE+OO 4.61E+OO Nb-95 <5.53E+OO O.OOE+OO 5.53E+OO 1-131 <1.1BE+01 O.OOE+OO 1.1BE+01 Cs-134 <4.15E+OO 0.00E+OO 4.15E+OO Cs-137 <3.62E+OO O.OOE+OO 3.62E+OO Bala-140 <7. 97E+OO O.OOE+OO 7.97E+OO Be-7 <3.64E+01 O.OOE+OO 3.64E+01 K-40 <5.74E+01 O.DOE+OO 5.74E+D1 Sample ID: 471526 Sample Dates: 2/26/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.18E+OO 9.25E-01 1.44E+DO Mn-54 <1.BBE+DO O.OOE+OO 1.88E+OO Co-58 <2.73E+OO 0.DOE+OO 2.73E+OO Fe-59 <5.31E+DO O.OOE+DO 5.31E+OO Report Generated@ 5/1/201911:57:36 EnRad Laboratories Appendix E - Page 54 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: DRINKING WATER Concentration (Activity): pCi/1 Sample Point 066 [INDICATOR-SSE@ 18.9 miles]

Sample ID: 471526 Sample Dates: 2/26/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA Co-60 <2 .00E+OO O.OOE+OO 2.00E+OO Zn-65 <3.19E+OO O.OOE+OO 3.19E+OO Zr-95 <4.71E+OO O.OOE+OO 4.71E+OO Nb-95 <3.54E+OO O.OOE+OO 3.54E+OO 1-131 <1.19E+01 O.OOE+OO 1.19E+01 Cs-134 <2.14E+OO O.OOE+OO 2.14E+OO Cs-137 <1.BOE+OO O.OOE+OO 1.BOE+OO BaLa-140 <7.65E+OO 0.00E+OO 7.65E+OO Be-7 <2.11E+01 O.OOE+OO 2.11E+01 K-40 9.23E+01 2.43E+01 2.55E+01 Sample ID: 467534 Sample Dates : 1/2/2018 -4/23/2018 Nuclide Activity 2 Sigma Error MDA H30W 4.57E+02 1.21E+02 1.B3E+02 Sample ID: 473438 Sample Dates: 3/26/2018 - 4/23/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.33E+OO B.39E-01 1.27E+OO Mn-54 <2.94E+OO 0.00E+OO 2.94E+OO Co-58 <3.43E+OO O.OOE+OO 3.43E+OO Fe-59 <7.92E+OO O.OOE+OO 7.92E+OO Co-60 <1 .66E+OO O.OOE+OO 1.66E+OO Zn-65 <6 .61E+OO O.OOE+OO 6.61 E+OO Zr-95 <5 .33E+OO 0.00E+OO 5.33E+OO Nb-95 <3.91E+OO O.OOE+OO 3.91 E+OO 1-131 <B.91E+OO 0.00E+OO 8.91E+OO Cs-134 <3.63E+OO O.OOE+OO 3.63E+OO Cs-137 <2.SBE+OO O.OOE+OO 2.58E+OO BaLa-140 <9.53E+OO O.OOE+OO 9.53E+OO Be-7 <3. 14E+01 O.OOE+OO 3.14E+01 K-40 3.99E+01 2.78E+01 3.92E+01 Sample ID: 475002 Sample Dates: 4/23/2018 -5/21/2018 Nuclide Activity 2 Sigma Error MDA Beta 9.32E-01 7.20E-01 1.18E+OO Mn-54 <3 .65E+OO 0.00E+OO 3.65E+OO Co-58 <4.27E+OO O.OOE+OO 4.27E+OO Fe-59 <6.58E+OO O.OOE+OO 6.58E+OO Co-60 <3.33E+OO O.OOE+OO 3.33E+OO Zn-65 <8.02E+OO O.OOE+OO 8.02E+OO Zr-95 <7 .21E+OO O.OOE+OO 7.21E+OO Nb-95 <5.23E+OO O.OOE+OO 5.23E+OO 1-131 <1.1 4E+01 O.OOE+OO 1.14E+01 Cs-134 <4.63E+OO O.OOE+OO 4.63E+OO Cs-137 <3.34E+OO O.OOE+OO 3.34E+OO BaLa-140 <8.09E+OO O.OOE+OO 8.09E+OO Be-7 <3 .38E+01 O.OOE+OO 3.38E+01 K-40 7.90E+01 3.58E+01 3.55E+01 Sample ID: 477665 Sample Dates: 5/21/2018 - 6/18/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.31E+OO 9.14E-01 1.49E+OO Mn-54 <3 .60E+OO O.OOE+OO 3.60E+OO Co-58 <3 .25E+OO O.OOE+OO 3.25E+OO Fe-59 <5.0BE+OO 0.00E+OO 5.0BE+OO Co-60 <2.55E+OO O.OOE+OO 2.55E+OO Zn-65 <7 .63E+OO O.OOE+OO 7.63E+OO Zr-95 <5.36E+OO O.OOE+OO 5.36E+OO Nb-95 <4.12E+OO 0.00E+OO 4.12E+OO 1-131 <1.19E+01 0.00E+OO 1.19E+01 Cs-134 <3.57E+OO O.OOE+OO 3.57E+OO Cs-137 <3.49E+OO 0.00E+OO 3.49E+OO BaLa-140 <9.29E+OO O.OOE+OO 9.29E+OO Be-7 <3.90E+01 O.OOE+OO 3.90E+01 K-40 3.55E+01 2.81E+01 4.00E+01 Sample ID: 474731 Sample Dates : 4/23/2018 - 7/16/2018 Nuclide Activity 2 Sigma Error MDA H30W 4.05E+02 1.27E+02 1.98E+02 Sample ID: 479533 Sample Dates: 6/18/2018 - 7/16/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.03E+OO 8.57E-01 1.41E+OO Mn-54 <3 .14E+OO O.OOE+OO 3.14E+OO Co-58 <3.60E+OO O.OOE+OO 3.60E+OO Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 55 of 91 Duke Energy Annual Report - Appendix E ((!I~ 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: DRINKING WATER Concentration (Activity): pCi/1 Sample Point 066 [INDICATOR-SSE@ 18.9 miles)

Sample ID: 479533 Sample Dates: 6/18/2018 -7/16/2018 Nuclide Activity 2 Sigma Error MDA Fe-59 <7.79E+OO O.OOE+OO 7.79E+OO Co-60 <2.74E+OO O.OOE+OO 2.74E+OO Zn-65 <6.42E+OO O.OOE+OO 6.42E+OO Zr-95 <6.20E+OO O.OOE+OO 6.20E+OO Nb-95 <2.76E+OO O.OOE+OO 2.76E+OO 1-131 <1.08E+01 O.OOE+OO 1.08E+01 Cs-134 <3.59E+OO O.OOE+OO 3.59E+OO Cs-137 <3.39E+OO O.OOE+OO 3.39E+OO Bala-140 <B.22E+OO O.OOE+OO 8.22E+OO Be-7 <3.11E+01 0.00E+OO 3.11E+01 K-40 4.61E+01 2.39E+01 2.75E+01 Sample ID: 481633 Sample Dates : 7/16/2018 - 8/13/2018 Nuclide Activity 2 Sigma Error MDA Beta 6.92E-01 7.41E-01 1.23E+OO Mn-54 <2.2BE+OO O.OOE+OO 2.28E+OO Co-58 <2.66E+OO O.OOE+OO 2.66E+OO Fe-59 <6.63E+OO O.OOE+OO 6.63E+OO Co-60 <2.63E+OO O.OOE+OO 2.63E+OO Zn-65 <6 .30E+OO O.OOE+OO 6.30E+OO Zr-95 <5.84E+OO O.OOE+OO 5.B4E+OO Nb-95 <4.25E+OO O.OOE+OO 4.25E+OO 1-131 <1.1DE+01 O.OOE+OO 1.10E+01 Cs-134 <2.62E+OO O.OOE+OO 2.62E+OO Cs-137 <2.29E+OO O.OOE+OO 2.29E+OO Bala-140 <7.34E+OO O.OOE+OO 7.34E+OO Be-7 <2.44E+01 O.OOE+OO 2.44E+01 K-40 4.69E+01 2.67E+01 3.66E+01 Sample ID: 483536 Sample Dates: 8/13/2018 - 9/10/2018 Nuclide Activity 2 Sigma Error MDA Beta <4.BSE-01 O.OOE+OO 1.30E+OO Mn-54 <2.57E+OO 0.00E+OO 2.57E+OO Co-SB <3.13E+OO O.OOE+OO 3.13E+OO Fe-59 <6.57E+OO O.OOE+OO 6.57E+OO Co-60 <3.09E+OO D.OOE+OO 3.09E+OO Zn-65 <6.89E+OO 0.00E+OO 6.89E+OO Zr-95 <6.16E+OO O.OOE+OO 6.16E+OO Nb-95 <2.77E+OO O.OOE+OO 2.77E+OO 1-131 <1 .1BE+01 O.OOE+OO 1.1BE+01 Cs-134 <3 .32E+OO 0.00E+OO 3.32E+OO Cs-137 <2.BOE+OO O.OOE+OO 2.BOE+OO Bala-140 <7.94E+OO 0.00E+OO 7.94E+OO Be-7 <2.66E+01 O.OOE+OO 2.66E+01 K-40 1.49E+01 2.31E+01 3.89E+01 Sample ID: 481636 Sample Dates: 7/16/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA H3DW 3.14E+02 1.1BE+02 1.86E+02 Sample ID: 485855 Sample Dates: 9/10/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA Beta 1.33E+OO 7.35E-01 1.17E+OO Mn-54 <2.39E+OO O.OOE+OO 2.39E+OO Co-58 <3.77E+OO 0.00E+OO 3.77E+OO Fe-59 <7.66E+OO O.OOE+OO 7.66E+OO Co-60 <2.BOE+OO O.OOE+OO 2.BOE+OO Zn-65 <6.23E+OO 0.00E+OO 6.23E+OO Zr-95 <6.SOE+DO O.OOE+OO 6.SOE+OO Nb-95 <3.BBE+OO O.OOE+OO 3.BBE+OO 1-131 <1.19E+01 0.00E+OO 1.19E+01 Cs-134 <3.54E+OO O.OOE+OO 3.54E+OO Cs-137 <3.BSE+OO O.OOE+OO 3.BSE+OO Bala-140 <8.4BE+OO D.DOE+OO 8.48E+OO Be-7 <2.25E+01 0.00E+OO 2.25E+D1 K-40 6.1 6E+01 2.75E+01 2.96E+D1 Sample ID: 488203 Sample Dates: 10/8/2018 -11/5/2018 Nuclide Activity 2 Sigma Error MDA Beta 7.81E-01 7.73E-01 1.29E+OO Mn-54 <3.09E+OO O.OOE+OO 3.09E+OO Co-58 <2.74E+OO O.OOE+OO 2.74E+OO Fe-59 <6.54E+OO O.OOE+OO 6.54E+OO Report Generated @ 5/1/2019 11 :57:36 Duke Energy Annual Report - Appendix E <ij =:> EnRad Laboratories 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 56 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: DRINKING WATER Concentration (Activity): pCi/1 Sample Point 066 [INDICATOR* SSE@ 18.9 miles]

Sample ID: 488203 Sample Dates: 10/8/2018 -11/5/2018 Nuclide Activity 2 Sigma Error MDA Co-60 <2.88E+OO O.OOE+OO 2.88E+OO Zn-65 <5.71E+OO O.OOE+OO 5.71 E+OO Zr-95 <6.52E+OO 0.00E+OO 6.52E+OO Nb-95 <4.13E+OO O.OOE+OO 4.13E+OO 1-131 <1 .18E+01 O.OOE+OO 1.18E+01 Cs-134 <3.04E+OO O.OOE+OO 3.04E+OO Cs-137 <2.88E+OO O.OOE+OO 2.88E+OO Bala-140 <7 .36E+OO O.OOE+OO 7.36E+OO Be-7 <2.41E+01 O.OOE+OO 2.41 E+01 K-40 <4.51E+01 O.OOE+OO 4.51 E+01 Sample ID: 490032 Sample Dates : 11/5/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA Beta 2.24E+OO 8.94E-01 1.38E+OO Mn-54 <2 .0GE+OO O.OOE+OO 2.0GE+OO Co-58 <2 .67E+OO O.OOE+OO 2.67E+OO Fe-59 <5.30E+OO O.OOE+OO 5.30E+OO Co-60 <2.49E+OO O.OOE+OO 2.49E+OO Zn-65 <5.07E+OO O.OOE+OO 5.07E+OO Zr-95 <4.89E+OO O.OOE+OO 4.89E+OO Nb-95 <3.0SE+OO O.OOE+OO 3.0SE+OO 1-131 <1 .10E+01 O.OOE+OO 1.10E+01 Cs-134 <2.18E+OO O.OOE+OO 2.18E+OO Cs-137 <2.30E+OO O.OOE+OO 2.30E+OO Bala-140 <6.15E+OO O.OOE+OO 6.15E+OO Be-7 <2 .26E+01 O.OOE+OO 2.26E+01 K-40 <3.40E+01 O.OOE+OO 3.40E+01 Sample ID: 488749 Sample Dates: 10/8/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA H3DW 2.47E+02 1.16E+02 1.87E+02 Sample ID: 491617 Sample Dates: 12/3/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <1.25E+OO O.OOE+OO 1.25E+OO Co-58 <1.49E+OO O.OOE+OO 1.49E+OO Fe-59 <3 .40E+OO O.OOE+OO 3.40E+OO Co-60 <1.29E+OO O.OOE+OO 1.29E+OO Zn-65 <3.0SE+OO O.OOE+OO 3.0SE+OO Zr-95 <3 .07E+OO O.OOE+OO 3.07E+OO Nb-95 <2.08E+OO O.OOE+OO 2.0BE+OO 1-131 <1.20E+01 O.OOE+OO 1.20E+01 Cs-134 <1.57E+OO O.OOE+OO 1.57E+OO Cs-137 <1.35E+OO O.OOE+OO 1.35E+OO Bala-140 <5.20E+OO O.OOE+OO 5.20E+OO Be-7 <1.38E+01 O.OOE+OO 1.38E+01 K-40 4.17E+01 1.57E+01 2.14E+01 Beta <3 .72E+OO O.OOE+OO 3.72E+OO Media Type: FISH Concentration (Activity): pCi/kg wet Sample Point 060 [ CONTROL FISH / INDICATOR

NE @ 3.23 miles]

Sample ID: 472828 Sample Dates: 4/23/2018 - 4/25/2018 FREESWIM Nuclide Activity 2 Sigma Error MDA Mn-54 <2.55E+01 O.OOE+OO 2.55E+01 Co-58 <3.47E+01 O.OOE+OO 3.47E+01 Fe-59 <6 .13E+01 O.OOE+OO 6.13E+01 Co-60 <3 .28E+01 O.OOE+OO 3.28E+01 Zn-65 <5 .87E+01 O.OOE+OO 5.87E+01 Nb-95 <3.31E+01 O.OOE+OO 3.31E+01 1-131 <6.65E+01 O.OOE+OO 6.65E+01 Cs-134 <2.17E+01 O.OOE+OO 2.17E+01 Cs-137 <3.62E+01 O.OOE+OO 3.62E+01 Be-7 <2.52E+02 O.OOE+OO 2.52E+02 K-40 2.90E+03 6.74E+02 4.33E+02 Ag-110M <2.59E+01 O.OOE+OO 2.59E+01 Sb-122 <1 .15E+03 O.OOE+OO 1.15E+03 Sb-125 <5.86E+01 O.OOE+OO 5.86E+01 Sample ID: 472829 Sample Dates: 4/23/2018 - 4/25/2018 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Mn-54 <1 .84E+01 O.OOE+OO 1.84E+01 Co-58 <4 .34E+01 O.OOE+OO 4.34E+01 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 57 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report- 2018 (Appendix E)

Media Type: FISH Concentration (Activity): *pci/kg wet Sample Point 060 [ CONTROL FISH/ INDICATOR - NE@ 3.23 miles]

Sample ID: 472829 Sample Dates: 4/23/2018 - 4/25/2018 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Fe-59 <4.97E+01 O.OOE+OO 4 .97E+01 Co-60 <3.88E+01 O.OOE+OO 3.88E+01 Zn-65 <1.12E+02 O.OOE+OO 1.12E+02 Nb-95 <2.20E+01 0.00E+OO 2.20E+01 1-131 <8.86E+01 0.00E+OO 8.86E+01 Cs-134 <3.63E+01 O.OOE+OO 3.63E+01 Cs-137 <2.54E+01 O.OOE+OO 2.54E+01 Be-7 <2.35E+02 O.OOE+OO 2.35E+ 02 K-40 3.93E+03 8.72E+02 5.95E+02 Ag-110M <1.60E+01 O.OOE+OO 1.60E+01 Sb-122 <1 .08E+03 O.OOE+OO 1.08E+03 Sb-125 <7 .37E+01 O.OOE+OO 7.37E+01 Sample ID: 486017 Sample Dates: 10/22/2018 -10/22/2018 FREESWIM Nuclide Activity 2 Sigma Error MDA Mn-54 <8.23E+D1 O.OOE+OO 8.23E+01 Co-58 <5.66E+01 O.OOE+OO 5.66E+01 Fe-59 <1.42E+02 O.OOE+OO 1.42E+02 Co-60 <8.42E+01 O.OOE+OO 8.42E+01 Zn-65 <2.01E+02 O.OOE+OO 2 .01E+02 Nb-95 <7.81E+01 O.OOE+OO 7 .81E+01 1-131 <3.59E+02 O.OOE+OO 3.59E+02 Cs-134 <6.33E+01 O.OOE+OO 6 .33E+ 01 Cs-137 <7.00E+01 O.OOE+OO 7 .00E+01 Be-7 <7.67E+02 O.OOE+OO 7 .67E+02 K-40 4.47E+03 1.12E+03 7.45E+02 Ag- 110M <7.0SE+01 O.OOE+OO 7 .05E+01 Sb-122 < 1.18E+04 O.OOE+OO 1.18E+04 Sb-125 < 1.66E+02 O.OOE+OO 1.66E+02 Sample ID: 486018 Sample Dates: 10/22/2018 - 10/24/2018 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Mn-54 <8.07 E+ 01 O.OOE+ OO 8.07E+ 01 Co-58 <6.20E+01 O.OOE+OO 6.20E+01 Fe-59 < 1.41E+02 O.OOE+OO 1.41E+02 Co-60 < 1.53E+01 O.OOE+OO 1.53E+01 Zn-65 < 1.47E+02 O.OOE+OO 1.47E+02 Nb-95 < 1.00E+02 O.OOE+OO 1.00E+02 1-131 <2.92E+02 O.OOE+OO 2 .92E+02 Cs-134 <8.26 E+01 O.OOE+OO 8.26E+01 Cs-137 <7 .12E+01 O.OOE+OO 7 .12E+01 Be-7 <5.20E+02 O.OOE+OO 5.20E+02 K-40 4.05E+03 1.04E+03 5.86E+02 Ag-110M <5.18E+01 O.OOE+OO 5.18E+01 Sb-122 <7 .91E+03 O.OOE+OO 7 .91E+03 Sb-125 < 1.52E+02 O.OOE+OO 1.52E+02 Sample Point 063 [ INDICATOR - ESE@ 0.8 miles]

Sample ID: 472830 Sample Dates: 4/24/2018

4/24/2018 FREESWIM Nuclide Activity 2 Sigma Error MDA Mn- 54 <4 .55E+ 01 O.OOE+OO 4 .55E+01 Co-58 < 2.78E+01 O.OOE+OO 2.78E+01 Fe-59 <6.86E+01 O.OOE+OO 6 .86E+01 Co-60 <4 .63E+0 1 O.OOE+OO 4.63E+01 Z n-65 <1.26E+02 O.OOE+OO 1.26E+02 Nb-95 <6 .2 0E+01 O.OOE+OO 6 .20E+01 1-131 <9 .57E+01 O.OOE+OO 9.57E+01 Cs-134 <4 .12E+01 O.OOE+OO 4 .12 E+01 Cs- 137 <6 .36E+ 01 O.OOE+ OO 6.36E+01 Be-7 <3.50E +02 O.OOE+OO 3 .50E+02 K- 40 5.16E+03 1.19E+03 8.88E+02 Ag-110M <3.61 E+01 O.OOE+ OO 3.61 E+01 Sb-122 <2.01E+03 O.OOE+OO 2 .01 E+ 03 Sb-1 25 <8.9 1 E+01 O.OOE+OO 8.91 E+01 Sample ID: 472831 Sample Dates: 4/25/2018 - 4/26/2018 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Mn-54 <3.84E+0 1 0 .00E +OO 3.84 E+ 01 Co-58 <4 .74 E+ 01 O.OOE+OO 4 .74E+01 Fe-59 < 1.01 E+02 O.OOE+OO 1.01 E+02 Co-60 <3.08E+01 O.OOE+OO 3.08E+01 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 58 of 91 Duke Energy Annual Report - Appendix E

<l[ ~ 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: FISH Concentration (Activity): pCi/kg wet Sample Point 063 [ INDICATOR - ESE @ 0.8 miles ]

Sample ID: 472831 Sample Dates: 4/25/2018 -4/26/2018 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Zn-65 <9.B2E+01 0.00E+OO 9.82E+01 Nb-95 <4.09E+01 O.OOE+OO 4.09E+01 1-131 <9.42E+01 O.OOE+OO 9.42E+01 Cs-134 <4.87E+01 O.OOE+OO 4.87E+01 Cs-137 <5.03E+01 O.OOE+OO 5.03E+01 Be-7 <2.91E+02 O.OOE+OO 2.91 E+02 K-40 3.86E+03 8.8BE+02 4.33E+02 Ag-110M <3.06E+01 O.OOE+OO 3.06E+01 Sb-122 <6.52E+02 0.00E+OO 6.52E+02 Sb-125 <8 .11E+01 O.OOE+OO 8.11E+01 Sample ID: 486019 Sample Dates: 10/22/2018 -10/22/2018 FREESWIM Nuclide Activity 2 Sigma Error MDA Mn-54 <6.00E+01 O.OOE+OO 6.00E+01 Co-58 <7.52E+01 O.OOE+OO 7.52E+01 Fe-59 <1.56E+02 O.OOE+OO 1.56E+02 Co-60 <4.59E+01 0.00E+OO 4.59E+01 Zn-65 <1.37E+02 O.OOE+OO 1.37E+02 Nb-95 <B.12E+01 O.OOE+OO 8.12E+01 1-131 <3.15E+02 O.OOE+OO 3.15E+02 Cs-134 <6.28E+01 O.OOE+OO 6.2BE+01 Cs-137 <6.16E+01 O.OOE+OO 6.16E+01 Be-7 <5.40E+02 O.OOE+OO 5.40E+02 K-40 4 .06E+03 1.03E+03 7.60E+02 Ag-110M <5.55E+01 0.00E+OO 5.55E+01 Sb-122 <1.21E+04 O.OOE+OO 1.21E+04 Sb-125 < 1.46E+02 O.OOE+OO 1.46E+02 Sample ID: 486020 Sample Dates: 10/22/2018 - 10/23/2018 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Mn-54 <7.69E+01 O.OOE+OO 7.69E+01 Co-58 <9.18E+01 O.OOE+OO 9 .1BE+01 Fe-59 <1 .7BE+02 0.00E+OO 1.7BE+02 Co-60 <7.24E+01 O.OOE+OO 7.24E+01 Zn-65 <1 .33E+02 O.OOE+OO 1.33E+02 Nb-95 <1.03E+02 O.OOE+OO 1.03E+02 1-131 <3.01E+02 0.00E+OO 3.01E+02 Cs-134 <6.84E+01 O.OOE+OO 6.84E+01 Cs-137 <7.5BE+01 O.OOE+OO 7.58E+01 Be-7 <6.84E+02 O.OOE+OO 6 .84E+02 K-40 3.1BE+03 1.04E+03 9 .93E+02 Ag-110M <5.13E+01 O.OOE+OO 5.13E+01 Sb-122 <1 .25E+04 O.OOE+OO 1.25E+04 Sb-125 <1.80E+02 O.OOE+OO 1.80E+02 Sample Point 067 [ INDICATOR - SSE @ 4.34 miles ]

Sample ID: 472832 Sample Dates: 4/24/2018 - 4/24/2018 FREESWIM Nuclide Activity 2 Sigma Error MDA Mn-54 <2.B9E+01 O.OOE+OO 2.89E+01 Co-58 <2.44E+01 O.OOE+OO 2.44E+01 Fe-59 <5.97E+01 O.OOE+OO 5.97E+01 Co-60 <2.53E+01 0.00E+OO 2.53E+01 Zn-65 <9.25E+01 O.OOE+OO 9.25E+01 Nb-95 <3.45E+01 0.00E+OO 3.45E+01 1-131 <8.36E+01 O.OOE+OO 8.36E+01 Cs-134 <2.47E+01 0.00E+OO 2.47E+01 Cs-137 <3.21E+01 O.OOE+OO 3.21E+01 Be-7 1.01E+02 1.27E+02 2.04E+02 K-40 3.09E+03 7.00E+02 9.30E+01 Ag-110M <1 .94E+01 O.OOE+OO 1.94E+01 Sb-122 <1.44E+03 O.OOE+OO 1.44E+03 Sb-125 <6.65E+01 O.OOE+OO 6.65E+01 Sample ID: 472833 Sample Dates: 4/24/2018 - 4/25/2018 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Mn-54 <2 .39E+01 O.OOE+OO 2.39E+01 Co-58 <3.16E+01 0.00E+OO 3.16E+01 Fe-59 <7 .77E+01 O.OOE+OO 7.77E+01 Co-60 <4.19E+01 0.00E+OO 4 .19E+01 Zn-65 <5.30E+01 O.OOE+OO 5.30E+01 Nb-95 <3.15E+01 O.OOE+OO 3.15E+01 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 59 of 91 Duke Energy Annual Report -Appendix E (~ 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: FISH Concentration (Activity): pCi/kg wet Sample Point 067 [ INDICATOR - SSE @ 4.34 miles]

Sample ID: 472833 Sample Dates : 4/24/2018 - 4/25/2018 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA 1-131 <5 .37E+01 O.OOE+OO 5.37E+01 Cs-134 <2.64E+01 O.OOE+OO 2.64E+01 Cs-137 <2.95E+01 O.OOE+OO 2 .95E+01 Be-7 <2.75E+02 O.OOE+OO 2 .75E+02 K-40 3.48E+03 7.73E+02 5.27E+02 Ag-110M <1.41E+01 O.OOE+OO 1.41E+01 Sb-122 <1 .28E+03 O.OOE+OO 1.28E+03 Sb-125 <6.90E+01 O.OOE+OO 6.90E+01 Sample ID: 486021 Sample Dates: 10/22/2018 -10/22/2018 FREESWIM Nuclide Activity 2 Sigma Error MDA Mn-54 <6 .98E+01 O.OOE+OO 6.98E+01 Co-58 <8 .03E+01 O.OOE+OO 8.03E+01 Fe-59 < 1.51E+02 O.OOE+OO 1.51 E+02 Co-60 <4 .04E+01 O.OOE+OO 4.04E+01 Zn-65 <1.09E+D2 O.OOE+OO 1.09E+02 Nb-95 <8.60E+01 0.00E+OO 8.60E+01 1-131 <3.82E+02 O.OOE+OO 3.82E+02 Cs-134 <7.33E+01 O.OOE+OO 7.33E+01 Cs-137 <7.25E+01 O.OOE+OO 7.25E+01 Be-7 <5 .56E+02 O.OOE+OO 5.56E+02 K-40 5.31E+03 1.2DE+03 6 .81 E+02 Ag-110M <5.32E+01 O.OOE+OO 5.32E+01 Sb-122 <1.52E+04 O.OOE+OO 1.52E+04 Sb-125 <1 .57E+02 O.OOE+OO 1.57E+02 Sample ID: 486022 Sample Dates: 10/22/2018 -10/22/2018 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Mn-54 <4.25E+01 O.OOE+OO 4.25E+01 Co-58 <5 .91E+01 0.00E+OO 5.91 E+01 Fe-59 <1.48E+02 O.OOE+OO 1.48E+02 Co-60 <4 .78E+01 0.00E+OO 4.7BE+01 Zn-65 <1.30E+02 O.OOE+OO 1.30E+02 Nb-95 <6.96E+01 O.OOE+OO 6.96E+01 1- 131 <2.62E+02 O.OOE+OO 2.62E+02 Cs-134 <5.01E+01 0.00E+OO 5.01 E+01 Cs- 137 <5.95E+01 O.OOE+OO 5.95E+01 Be-7 <4.30E+02 O.OOE+OO 4.30E+02 K-40 3.28E+03 8.79E+02 6.95E+02 Ag-110M <5.58E+01 O.OOE+OO 5.58E+01 Sb-122 <1.05E+04 O.OOE+OO 1.05E+04 Sb-125 < 1.13E+02 0.00E+OO 1.13E+02 Media Type: MILK Concentration (Activity): pCi/1 Sample Point 071 [CONTROL-SSE@ 10.2 miles J Sample ID: 466221 Sample Dates : 1/8/2018 -1/8/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 <5.74E-01 0.00E+OO 5.74E-01 1-131 <7.00E+OO O.OOE+OO 7.00E+OO Cs-134 <7.03E+OO 0.00E+OO 7.03E+OO Cs- 137 <5.57E+OO O.OOE+OO 5.57E+OO BaLa-140 <8.76E+OO O.OOE+OO 8 .76E+OO Be-7 <6.09E+01 0.00E+OO 6.09E+01 K-40 1.52E+0 3 2.45E+02 9.82E+01 Sample ID: 467004 Sample Dates: 1/22/2018 -1/22/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 <6.17E-01 O.OOE+OO 6.17E-01 1-131 <7.38E+OO 0.00E+OO 7 .38E+OO Cs-134 <8.16E+OO O.OOE+OO 8.16E+OO Cs-137 <9.34E+OO 0.00E+OO 9.34E+OO BaLa-140 <2.35E+OO O.OOE+OO 2.35E+OO Be-7 <5 .12E+01 O.OOE+OO 5.12E+01 K-40 1.57E+03 2.44E+02 1.08E+02 Sample ID: 467684 Sample Dates: 2/5/2018 - 2/5/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 <6.45E-01 O.OOE+OO 6.45E-01 1-131 <9.47E+OO O.OOE+OO 9.47E+OO Cs-134 <8.33E+OO O.OOE+OO 8.33E+OO Cs-137 <8.0BE+OO 0.00E+OO 8.0BE+OO BaLa-140 <9.11E+OO O.OOE+OO 9.11E+OO Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Duke Energy Annual Report -Appendix E (En __) 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 60 of 91

OCONEE Radiological Environmental Monitoring Analysis Report- 2018 (Appendix E)

Media Type: MILK Concentration (Activity): pCi/1 Sample Point 071 [ CONTROL - SSE @ 10.2 miles ]

Sample ID: 467684 Sample Dates: 2/5/2018 - 2/5/2018 Nuclide Activity 2 Sigma Error MDA Be-7 <5.B9E+01 O.OOE+OO 5.B9E+01 K-40 1.54E+03 2.37E+02 8.58E+01 Sample ID: 468782 Sample Dates: 2/19/2018 -2/19/2018 Nuclide Activity 2 Sigma Error MDA lll-131 <5.BSE-01 O.OOE+OO 5.BSE-01 1-131 <7.48E+OO O.OOE+OO 7.48E+OO Cs-134 <6.BBE+OO O.OOE+OO 6.BBE+OO Cs-137 <8.0BE+OO 0.00E+OO 8.0BE+OO Bala-140 <7.90E+OO O.OOE+OO 7.90E+OO Be-7 <5.22E+01 O.OOE+OO 5.22E+01 K-40 1.34E+03 2.18E+02 8.14E+01 Sample ID: 470629 Sample Dates : 3/5/2018 - 3/5/2018 Nuclide Activity 2 Sigma Error MDA lll-131 <6.40E-01 O.OOE+OO 6.40E-01 1-131 <7.61E+OO O.OOE+OO 7.61 E+OO Cs-134 <8 .33E+OO O.OOE+OO 8.33E+OO Cs-137 <7.73E+OO O.OOE+OO 7.73E+OO Bala-140 <7.81E+OO O.OOE+OO 7.81E+OO Be-7 <6.84E+01 O.OOE+OO 6.84E+01 K-40 1.54E+03 2.35E+02 6.54E+01 Sample ID: 471737 Sample Dates: 3/19/2018 - 3/19/2018 Nuclide Activity 2 Sigma Error MDA lll-131 <6.10E-01 0.00E+OO 6.1 OE-01 1-131 <6.82E+OO O.OOE+OO 6.82E+OO Cs-134 <6 .31E+OO O.OOE+OO 6.31E+OO Cs-137 <6 .0BE+OO O.OOE+OO 6.0BE+OO Bala-140 <9 .07E+OO 0.00E+OO 9.07E+OO Be-7 <6.09E+01 O.OOE+OO 6.09E+01 K-40 1.42E+03 2.25E+02 7.70E+01 Sample ID: 473007 Sample Dates: 4/2/2018 -4/2/2018 Nuclide Activity 2 Sigma Error MDA lll-131 <6.33E-01 O.OOE+OO 6.33E-01 1-131 <6 .18E+OO O.OOE+OO 6.18E+OO Cs-134 <8.79E+OO O.OOE+OO B.79E+OO Cs-137 <5.57E+OO 0.00E+OO 5.57E+OO Bala-140 <1. 13E+01 O.OOE+OO 1.13E+01 Be-7 <5.B2E+01 O.OOE+OO 5.B2E+01 K-40 1.45E+03 2.36E+02 8.30E+01 Sample ID: 473656 Sample Dates: 4/16/2018 -4/16/2018 Nuclide Activity 2 Sigma Error MDA lll-131 <5.BSE-01 O.OOE+OO 5.BSE-01 1-131 <7.20E+OO O.OOE+OO 7.20E+OO Cs-134 <7.89E+OO O.OOE+OO 7.89E+OO Cs-137 <7.73E+OO O.OOE+OO 7.73E+OO Bala-140 <6.60E+OO 0.00E+OO 6.60E+OO Be-7 <4.76E+01 O.OOE+OO 4.76E+01 K-40 1.47E+03 2.30E+02 B.07E+01 Sample ID: 474550 Sample Dates: 4/30/2018 -4/30/2018 Nuclide Activity 2 Sigma Error MDA lll-131 <6.47E-01 O.OOE+OO 6.47E-01 1-131 <8.65E+OO O.OOE+OO 8.65E+OO Cs-134 <6.30E+OO O.OOE+OO 6.30E+OO Cs-137 <6.79E+OO O.OOE+OO 6 .79E+OO Bala-140 <6.97E+OO O.OOE+OO 6.97E+OO Be-7 <4.20E+01 O.OOE+OO 4.20E+01 K-40 1.41 E+03 2.41E+02 1.39E+02 Sample ID: 475237 Sample Dates: 5/14/2018 - 5/14/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 <6.35E-01 O.OOE+OO 6.35E-01 1-131 <7.52E+OO O.OOE+OO 7.52E+OO Cs-134 <6.64E+OO O.OOE+OO 6.64E+OO Cs-137 <6.40E+OO 0.00E+OO 6.40E+OO Bala-140 <6.54E+OO O.OOE+OO 6.54E+OO Be-7 <4.93E+01 O.OOE+OO 4.93E+01 K-40 1.43E+03 2.33E+02 1.13E+02 Sample ID: 476383 Sample Dates: 5/29/2018 - 5/29/2018 Nuclide Activity 2 Sigma Error MDA lll-131 <5.88E-01 O.OOE+OO 5.BBE-01 1-131 <6 .72E+OO O.OOE+OO 6.72E+OO Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Duke Energy Annual Report - Appendix E Cl[_) 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 61 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: MILK Concentration (Activity): pCi/1 Sample Point 071 [CONTROL-SSE@ 10.2 miles]

Sample ID: 476383 Sample Dates: 5/29/2018 - 5/29/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <6.29E+OO O.OOE+OO 6.29E+OO Cs-137 <5 .89E+OO O.OOE+OO 5.89E+OO Bala-140 <7.51E+OO O.OOE+OO 7.51 E+OO Be-7 <5.83E+01 0.00E+OO 5.83E+01 K-40 1.42E+03 2.27E+02 9.99E+01 Sample ID: 478129 Sample Dates: 6/11/2018 -6/11/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 <6.28E-01 O.OOE+OO 6.28E-01 1-131 <6.41E+OO O.OOE+OO 6.41 E+OO Cs-134 <9.62E+OO 0.00E+OO 9.62E+OO Cs-137 <6.89E+OO O.OOE+OO 6 .89E+OO Bala-140 <9.13E+OO O.OOE+OO 9.13E+OO Be-7 <4 .58E+01 0.00E+OO 4 .58E+01 K-40 1.55E+03 2.43E+02 1.11E+02 Sample ID: 478818 Sample Dates: 6/25/2018 - 6/25/2018 Nuclide Activity 2 Sigma Error MDA LLl- 131 <6.15E-01 0.00E+OO 6.15E-01 1-131 <6.83E+OO O.OOE+OO 6 .83E+OO Cs-134 <7 .12E+OO O.OOE+OO 7.12E+OO Cs-137 <6 .29E+OO 0 .00E+OO 6.29E+OO Bala-140 <6.43E+OO O.OOE+OO 6.43E+OO Be-7 <4 .85E+01 0.00E+OO 4 .85E+01 K-40 1.47E+03 2.32E+02 8.07E+01 Sample ID: 479905 Sample Dates: 7/9/2018 - 7/9/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 <6 .17E-01 O.OOE+OO 6.17E-01 1-131 <6 .17E+OO O.OOE+OO 6.17E+OO Cs-134 <7.82E+OO O.OOE+OO 7.82E+OO Cs-137 <7 .78E+OO 0 .00E+OO 7 .78E+OO Bala-140 <2 .33E+OO O.OOE+OO 2.33E+OO Be-7 <6.96E+01 0.00E+OO 6 .96E+01 K-40 1.37E+03 2.25E+02 7 .55E+01 Sample ID: 481095 Sample Dates: 7/23/2018 - 7/23/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 <6.17E-01 0.00E+OO 6.17E-01 1-131 <9 .13E+OO O.OOE+OO 9.13E+OO Cs-134 <8.34E+OO O.OOE+OO 8.34E+OO Cs-137 <9.23E+OO O.OOE+OO 9.23E+OO Bala-140 <9 .70E+OO O.OOE+OO 9.70E+OO Be-7 < 5.50E+01 0 .00E+OO 5.50E+01 K-40 1.55E+03 2.55E+02 1.55E+02 Sample ID: 481990 Sample Dates : 8/6/2018 - 8/6/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 <6 .46E-01 0.00E+OO 6.46E-01 1-131 <8.46E+OO O.OOE+OO 8.46E+OO Cs-134 <9.56E+OO 0.00E+OO 9.56E+OO Cs-137 <6.85E+OO O.OOE+OO 6.85E+OO Bala-140 <6 .18E+OO 0.00E+OO 6 .18E+OO Be-7 <5.15E+01 O.OOE+OO 5.15E+01 K-40 1.42E+03 2 .31E+02 1.09E+02 Sample ID: 482829 Sample Dates: 8/20/2018 - 8/20/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 < 5.72E-01 O.OOE+OO 5.72E-01 1-131 <6 .53E+OO O.OOE+OO 6.53E+OO Cs-134 <6 .31E+OO O.OOE+OO 6.31 E+OO Cs-137 <5.57E+OO 0.00E+OO 5.57E+OO Bala-140 <2.28E+OO O.OOE+OO 2 .28E+OO Be-7 2.84E-01 2.93E+01 5.66E+01 K-40 1.46E+03 2 .37E+02 1.36E+02 Sample ID: 483575 Sample Dates: 9/4/2018 - 9/4/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 <6.02E-01 O.OOE+OO 6 .02E-01 1-131 <7.61E+OO 0.00E+OO 7 .61E+OO Cs-134 <7.28E+OO O.OOE+OO 7 .28E+OO Cs-137 <8.89E+OO 0.00E+OO 8.89E+OO Bala-140 <6 .65E+OO O.OOE+OO 6.65E+OO Be-7 <4 .66E+01 O.OOE+OO 4.66E+01 K-40 1.41E+03 2.30E+02 8.03E+01 EnRad Laboratories Report Generated @ 5/1/2019 11 :57:36 Duke Energy Annual Report - Appendix E (f~ ~ 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 62 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: MILK Concentration (Activity): pCi/1 Sample Point 071 [ CONTROL - SSE@ 10.2 miles]

Sample ID: 485048 Sample Dates: 9/17/2018 - 9/17/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 <5 .70E-01 O.OOE+OO 5.70E-01 1-131 <6.71E+OO 0.00E+OO 6.71E+OO Cs-134 <7.83E+OO O.OOE+OO 7.83E+OO Cs-137 <7.36E+OO 0.00E+OO 7.36E+OO Bala-140 <9.78E+OO O.OOE+OO 9.78E+OO Be-7 <4 .34E+01 O.OOE+OO 4 .34E+01 K-40 1.48E+03 2 .37E+02 7.66E+01 Sample ID: 486192 Sample Dates : 10/1/2018 -10/1/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 <6 .28E-01 0.00E+OO 6.28E-01 1- 131 <6.70E+OO O.OOE+OO 6.70E+OO Cs-134 <6 .30E+OO O.OOE+OO 6.30E+OO Cs-137 <6 .54E+OO 0.00E+OO 6.54E+OO Bala-140 < 8.75E+OO O.OOE+OO 8.75E+OO Be-7 <4 .92E+01 O.OOE+OO 4 .92E+01 K-40 1.62E+03 2.SOE+02 1.20E+02 Sample ID: 487759 Sample Dates : 10/15/2018 - 10/15/2018 Nuclide Activity 2 Sigma Error MDA LLl - 131 <5 .27E-01 O.OOE+OO 5.27E-01 1-131 <6.52E+OO O.OOE+OO 6 .52E+OO Cs-134 <5.96E+OO O.OOE+OO 5.96E+OO Cs-137 <5 .89E+OO O.OOE+OO 5.89E+OO Bala-140 <2.29E+OO O.OOE+OO 2.29E+OO Be-7 <5.95E+01 0.00E+OO 5.95E+01 K-40 1.34E+03 2.16E+02 1.80E+01 Sample ID: 488495 Sample Dates: 10/29/2018 -10/29/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 <6 .14E-01 0 .00E+OO 6 .14E-01 1-131 <6.97E+OO O.OOE+OO 6 .97E+OO Cs-134 <7.88E+OO O.OOE+OO, 7 .88E+OO Cs-137 <6 .96E+OO O.OOE+OO 6.96E+OO Bala-140 <7 .SSE+OO 0 .00E+OO 7.55E+OO Be-7 <5.40E+01 O.OOE+OO 5.40E+01 K-40 1.32E+03 2 .20E+02 1.12E+02 Sample ID: 489171 Sample Dates: 11/12/2018 -11/12/2018 Nuclide Activity 2 Sigma Error MOA LLl-131 <6 .20E-01 O.OOE+OO 6.20E-01 1-131 <6 .11E+OO 0.00E+OO 6 .11E+OO Cs-134 <9 .62E+OO O.OOE+ OO 9 .62E+OO Cs-137 <8 .86E+OO 0.00E+OO 8.86E+OO Bala-140 <9.13E+OO O.OOE+OO 9.13E+OO Be-7 <4 .88E+01 O.OOE+OO 4.88E+01 K-40 1.33E+03 2.26E+02 1.32E+02 Sample ID: 490176 Sample Dates: 11/26/2018 -11/26/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 < 5.65E-01 O.OOE+OO 5.65E-01 1-131 <5.97E+OO O.OOE+OO 5.97E+OO Cs-134 <9.04E+OO O.OOE+OO 9.04E+OO Cs-137 <7.20E+OO O.OOE+OO 7 .20E+OO Bala-140 <7.69E+OO O.OOE+OO 7 .69E+OO Be-7 <5. 32E+01 0 .00E+OO 5.32E+01 K-40 1.46E+03 2 .31E+02 8.39E+01 Sample ID: 491198 Sample Dates : 12/10/2018 - 12/10/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 <6.48E-01 O.OOE+OO 6.48E-01 1-131 < 1.00E+01 O.OOE+OO 1.00E+01 Cs- 134 <6.64E+OO O.OOE+OO 6.64E+OO Cs- 137 < 9.19E+OO 0.00E+OO 9.19E+OO Bala-140 < 1.00E+01 O.OOE+OO 1.00E+01 Be-7 <5.27E+01 0.00E+OO 5.27E+01 K-40 1.45E+03 2.27E+02 1.80E+01 Sample ID: 491784 Sample Dates: 12/26/2018 -12/26/2018 Nuclide Activity 2 Sigma Error MDA LLl-131 <5.94E-01 0.00E+OO 5.94E-01 1- 131 <6.55E+OO O.OOE+OO 6.55E+OO Cs-134 <7 .11E+OO O.OOE+OO 7 .11E+OO C s-137 <5.76E+OO O.OOE+OO 5.76E+OO Bala-140 <7.69E+OO O.OOE+OO 7.69E+OO Be-7 <4.79E+01 O.OOE+OO 4 .79E+01 EnRad Laboratories

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Report Generated @ 5/1/2019 11 :57:36 Appendix E - Page 63 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville. North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: MILK Concentration (Activity): pCi/1 Sample Point 071 [CONTROL-SSE@ 10.2 miles]

Sample ID: 491784 Sample Dates: 12/26/2018 - 12/26/2018 Nuclide Activity 2 Sigma Error MDA K-40 1.28E+0 3 2 .09E+02 1.78E+01 Media Type: SEDIMENT_SHORE Concentration (Activity): pCi/kg Sample Point 067 [ INDICATOR - SSE @ 4.34 miles]

Sample ID: 470630 Sample Dates: 3/19/2018

3/19/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <7 .84E+01 0.00E+OO 7 .84E+01 Co-58 <7.88E+01 O.OOE+OO 7.88E+01 Fe-59 <1 .60E+02 0 .00E+OO 1.60E+02 Co-60 <7 .22E+01 O.OOE+OO 7.22E+01 Zn-65 <1.39E+02 O.OOE+OO 1.39E+02 Zr-95 < 1.91E+02 O.OOE+OO 1.91 E+02 Nb-95 < 1.09E+02 0.00E+OO 1.09E+02 1-131 <2 .30E+02 O.OOE+OO 2.30E+02 Cs-134 <1.31E+02 O.OOE+OO 1.31 E+02 Cs-137 1.11E+02 6.64E+02 1.12E+02 Bala-140 <1.20E+02 O.OOE+OO 1.20E+02 Be-7 <O .OOE+OO O.OOE+OO O.OOE+OO K-40 1.68E+04 2 .09E+03 O.OOE+OO Cr-51 <9.51E+02 O.OOE+OO 9.51 E+02 Co-57 <6 .53E+01 O.OOE+OO 6 .53E+01 Y-88 <7 .84E+01 O.OOE+OO 7.84E+01 Ru-103 <8 .96E+01 0.00E+OO 8.96E+01 Cd-109 <2.80E+03 O.OOE+OO 2.80E+03 Ag-110M <8 .08E+01 O.OOE+OO 8.08E+01 Sn-113 <9.98E+01 O.OOE+OO 9.98E+01 Cd-115 <4.56E+03 O.OOE+OO 4 .56E+03 Sb-122 <5.43E+03 O.OOE+OO 5.43E+03 Sb- 124 <8.62E+01

O.OOE+OO 8.62E+01 Sb-125 <1 .78E+02 O.OOE+OO 1.78E+02 Ba-133 <8.86E+01 O.OOE+OO 8.86E+01 1-133 <6 .86E+06 0.00E+OO 6.86E+06 Ce-139 <7.66E+01 O.OOE+OO 7.66E+01 Ce-141 <1.67E+02 O.OOE+OO 1.67E+02 Ce-144 <5 .52E+02 O.OOE+OO 5.52E+02 Hg-203 <1 .31E+02 0.00E+OO 1.31E+02 Am-241 <3 .71E+02 O.OOE+OO 3.71E+02 Te-123M <7.52E+01 0.00E+OO 7 .52E+01 Sample ID: 484048 Sample Dates : 9/17/2018 - 9/17/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <5.57E+01 O.OOE+OO 5.57E+01 Co-58 <5.21E+01 O.OOE+OO 5.21 E+01 Fe-59 <8.81E+01 0.00E+OO 8.81 E+01 Co-60 <3.92E+01 0.00E+OO 3.92E+01 Zn-65 <8.99E+01 O.OOE+OO 8.99E+01 Zr-95 < 1.47E+02 O.OOE+OO 1.47E+02 Nb-95 <6.04E+01 O.OOE+OO 6.04E+01 1-131 < 1.07E+02 O.OOE+OO 1.07E+02 Cs-134 <6.36E+01 O.OOE+OO 6.36E+01 Cs-137 <5.09E+01 O.OOE+OO 5.09E+01 Be-7 <4 .33E+02 O.OOE+OO 4.33E+02 K-40 1.27E+04 1.37E+03 6.52E+02 Co-57 <5.07E+01 O.OOE+OO 5.07E+01 Mo-99 <5.17E+03 0.00E+OO 5.17E+03 Ag-110M <4.50E+01 O.OOE+OO 4.50E+01 Sb- 122 <1.32E+03 0.00E+OO 1.32E+03 Sb-125 <1.30E+02 O.OOE+OO 1.30E+02 Sample Point 068 [ CONTROL-W@ 1.82 miles]

Sample JD: 470631 Sample Dates: 3/19/2018 - 3/19/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <2 .91E+01 O.OOE+OO 2.91 E+01 Co-58 <2 .95E+01 O.OOE+OO 2.95E+01 Fe-59 <5.97E+01 O.OOE+OO 5.97E+01 Co-60 <4.45E+01 O.OOE+OO 4.45E+01 Zn-65 <7.96E+01 O.OOE+OO 7.96E+01 Zr-95 <6.57E+01 O.OOE+OO 6.57E+01 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 64 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: SEDIMENT_SHORE Concentration (Activity): pCi/kg Sample Point 068 [ CONTROL -W@ 1.82 miles]

Sample ID: 470631 Sample Dates: 3/19/2018 - 3/19/2018 Nuclide Activity 2 Sigma Error MDA Nb-95 <4.79E+01 O.OOE+OO 4.79E+01 1-131 <8.81E+01 O.OOE+OO 8.81E+01 Cs-134 <3.79E+01 O.OOE+OO 3.79E+01 Cs-137 <3.52E+01 O.OOE+OO 3.52E+01 Be-7 <3.96E+02 0.00E+OO 3.96E+02 K-40 5.88E+03 9.89E+02 4.42E+02 Co-57 <2.26E+01 O.OOE+OO 2.26E+01 Mo-99 <9.70E+03 O.OOE+OO 9.70E+03 Ag-110M <3.48E+01 0.00E+OO 3.48E+01 Sb-122 <1.40E+03 O.OOE+OO 1.40E+03 Sb-125 <6.06E+01 O.OOE+OO 6.06E+01 Sample ID: 484049 Sample Dates : 9/17/2018 - 9/17/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.71E+01 O.OOE+OO 2.71 E+01 Co-58 <2. 35E+01 O.OOE+OO 2.35E+01 Fe-59 <4.74E+01 O.OOE+OO 4.74E+01 Co-60 <2.21E+01 O.OOE+OO 2.21E+01 Zn-65 <4.76E+01 O.OOE+OO 4.76E+01 Zr-95 <5.45E+01 O.OOE+OO 5.45E+01 Nb-95 <3.35E+01 O.OOE+OO 3.35E+01 1- 131 <5.45E+01 O.OOE+OO 5.45E+01 Cs-134 <4.04E+01 0.00E+OO 4.04E+01 Cs-137 <3.39E+01 O.OOE+OO 3.39E+01 Be-7 7.65E+02 2.33E+02 2.84E+02 K-40 5.39E+03 7.62E+02 3.47E+02 Co-57 <2.12E+01 0.00E+OO 2.12E+01 Mo-99 < 1.79E+03 O.OOE+OO 1.79E+03 Ag-110M <2. 12E+01 0.00E+OO 2.12E+01 Sb-122 <3.82E+02 O.OOE+OO 3.82E+02 Sb-125 <5.21E+01 0.00E+OO 5.21E+01 Sample Point 091 [ INDICATOR - S @ 2.09 miles ]

Sample ID: 470632 Sample Dates : 3/19/2018 - 3/19/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <9.32E+01 O.OOE+OO 9.32E+01 Co-58 <8.07E+01 0.00E+OO 8.07E+01 Fe-59 < 1.98E+02 O.OOE+OO 1.98E+02 Co-60 <8.96E+01 O.OOE+OO 8.96E+01 Zn-65 <1.84E+02 O.OOE+OO 1.84E+02 Zr-95 <1.25E+02 O.OOE+OO 1.25E+02 Nb-95 <9.07E+01 O.OOE+OO 9.07E+01 1-131 <1.61E+02 O.OOE+OO 1.61 E+02 Cs-134 <8.80E+01 O.OOE+OO 8.80E+01 Cs-137 3.16E+02 9.79E+01 1.19E+02 Be-7 6.50E+02 5.31E+02 8.29E+02 K-40 3.05E+04 3.56E+03 8.20E+02 Co-57 <5.27E+01 O.OOE+OO 5.27E+01 Mo-99 < 1.57E+04 O.OOE+OO 1.57E+04 Ag-110M <6.24E+01 0.00E+OO 6.24E+01 Sb-122 <2.36E+03 O.OOE+OO 2.36E+03 Sb-125 <1.52E+02 O.OOE+OO 1.52E+02 Sample ID: 484050 Sample Dates: 9/17/2018 - 9/17/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.74E+01 O.OOE+OO 2.74E+01 Co-58 <2.52E+01 0.00E+OO 2.52E+01 Fe-59 <5.82E+01 O.OOE+OO 5.82E+01 Co-60 <2.81E+01 O.OOE+OO 2.81E+01 Zn-65 <8.08E+01 0.00E+OO 8.0BE+01 Zr-95 <4.86E+01 O.OOE+OO 4.86E+01 Nb-95 <2.92E+01 O.OOE+OO 2.92E+01 1-131 <4.63E+01 O.OOE+OO 4.63E+01 Cs-134 <3.51E+01 0.00E+OO 3.51 E+01 Cs-137 1.93E+01 1.83E+01 2.92E+01 Be-7 5.25E+02 2.27E+02 3.30E+02 K-40 1.81E+04 1.77E+03 3.30E+02 Co-57 <2.07E+01 O.OOE+OO 2.07E+01 Mo-99 <2.19E+03 O.OOE+OO 2.19E+03 Ag-110M <2.10E+01 O.OOE+OO 2.10E+01 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 65 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: SEDIMENT_SHORE Concentration (Activity): pCi/kg Sample Point 091 [INDICATOR* S@ 2.09 miles]

Sample ID: 484050 Sample Dates: 9/17/2018

9/17/2018 Nuclide Activity 2 Sigma Error MDA Sb-122 <4.01E+02 O.OOE+OO 4.01E+02 Sb-125 <6.40E+01 O.OOE+OO 6 .40E+01 Media Type: SURFACE WATER Concentration (Activity): pCi/1 Sample Point 062 [ CONTROL

ENE @ 0.85 miles ]

Sample ID: 467356 Sample Dates: 1/2/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <3 .11E+OO O.OOE+OO 3.11E+OO Co-58 <3.20E+OO 0.00E+OO 3.20E+OO Fe-59 <5.93E+OO O.OOE+OO 5.93E+OO Co-60 <3.22E+OO 0.00E+OO 3.22E+OO Zn-65 <6.86E+OO O.OOE+OO 6.86E+OO Zr-95 <4.70E+OO O.OOE+OO 4.70E+OO Nb-95 <4.44E+OO O.OOE+OO 4.44E+OO 1-131 <1.10E+01 O.OOE+OO 1.10E+01 Cs-134 <3.56E+OO 0.00E+OO 3.56E+OO Cs-137 <2.91E+OO O.OOE+OO 2.91E+OO Bala-140 <7 .67E+OO O.OOE+OO 7.67E+OO Be-7 <2.71E+01 O.OOE+OO 2.71 E+01 K-40 <5.52E+01 O.OOE+OO 5.52E+01 Sample ID: 469590 Sample Dates: 1/29/2018 - 2/26/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <3.19E+OO O.OOE+OO 3.19E+OO Co-58 <3.38E+OO O.OOE+OO 3.38E+OO Fe-59 <8.07E+OO 0.00E+OO 8.07E+OO Co-60 <4.01E+OO O.OOE+OO 4.01 E+OO Zn-65 <9.63E+OO O.OOE+OO 9.63E+OO Zr-95 <4.31E+OO O.OOE+OO 4.31 E+OO Nb-95 <4.98E+OO O.OOE+OO 4.98E+OO 1-131 <1.15E+01 O.OOE+OO 1.15E+01 Cs-134 <4.04E+OO O.OOE+OO 4.04E+OO Cs-137 <2.92E+OO O.OOE+OO 2.92E+OO Bala-140 <9.40E+OO O.OOE+OO 9.40E+OO Be-7 <2.52E+01 O.OOE+OO 2.52E+01 K-40 <5.48E+01 O.OOE+OO 5.48E+01 Sample ID: 472534 Sample Dates : 2/26/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <1.84E+OO O.OOE+OO 1.84E+OO Co-58 <1.74E+OO O.OOE+OO 1.74E+OO Fe-59 <3.68E+OO 0.00E+OO 3.68E+OO Co-60 <1 .77E+OO O.OOE+OO 1.77E+OO Zn-65 <3.64E+OO 0.00E+OO 3.64E+OO Zr-95 <3.63E+OO O.OOE+OO 3.63E+OO Nb-95 <2.59E+OO O.OOE+OO 2.59E+OO 1-131 <9.69E+OO O.OOE+OO 9.69E+OO Cs-134 <2.02E+OO 0.00E+OO 2.02E+OO Cs-137 <1.90E+OO O.OOE+OO 1.90E+OO Bala-140 <5.12E+OO 0.00E+OO 5.12E+OO Be-7 <1.82E+01 O.OOE+OO 1.82E+01 K-40 2.67E+01 1.98E+01 3.08E+01 Sample ID: 467535 Sample Dates : 1/2/2018 -4/23/2018 Nuclide Activity 2 Sigma Error MDA H3SW <6.64E+01 O.OOE+OO 1.82E+02 Sample ID: 474172 Sample Dates: 3/26/2018 -4/23/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.89E+OO O.OOE+OO 2.89E+OO Co-58 <2.94E+OO O.OOE+OO 2.94E+OO Fe-59 <5.95E+OO O.OOE+OO 5.95E+OO Co-60 <2.63E+OO O.OOE+OO 2.63E+OO Zn-65 <5.99E+OO O.OOE+OO 5.99E+OO Zr-95 <5.22E+OO 0.00E+OO 5.22E+OO Nb-95 <3.89E+OO O.OOE+OO 3.89E+OO 1-131 <1 .12E+01 0.00E+OO 1.12E+01 Cs-134 <3.20E+OO O.OOE+OO 3.20E+OO Cs-137 <3.02E+OO 0.00E+OO 3.02E+OO Bala-140 <7.BOE+OO O.OOE+OO 7.80E+OO Be-7 <2.59E+01 0.00E+OO 2.59E+01 K-40 2.53E+01 2.32E+01 3.57E+01 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 66 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report- 2018 (Appendix E)

Media Type: SURFACE WATER Concentration (Activity): pCi/1 Sample Point 062 [ CONTROL - ENE @ 0.85 miles ]

Sample ID: 475558 Sample Dates: 4/23/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <3 .38E+OO O.OOE+OO 3.38E+OO Co-58 <3.76E+OO O.OOE+OO 3.76E+OO Fe-59 <7.64E+OO O.OOE+OO 7.64E+OO Co-60 <3.87E+OO O.OOE+OO 3.87E+OO Zn-65 <7.11E+OO O.OOE+OO 7.11E+OO Zr-95 <7.10E+OO O.OOE+OO 7.10E+OO Nb-95 <6.72E+OO O.OOE+OO 6.72E+OO 1-131 <1.03E+01 O.OOE+OO 1.03E+01 Cs-134 <4.22E+OO O.OOE+OO 4.22E+OO Cs-137 <3.49E+OO O.OOE+OO 3.49E+OO Bala-140 <1.08E+01 O.OOE+OO 1.08E+01 Be-7 <4 .31E+01 O.OOE+OO 4.31E+01 K-40 3.58E+01 2.76E+01 3.69E+01 Sample ID: 478445 Sample Dates: 5/21/2018 - 6/18/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <3.37E+OO O.OOE+OO 3.37E+OO Co-58 <4.10E+OO O.OOE+OO 4.10E+OO Fe-59 <6.01E+OO O.OOE+OO 6.01E+OO Co-60 <3.67E+OO O.OOE+OO 3.67E+OO Zn-65 <5.59E+OO O.OOE+OO 5.59E+OO Zr-95 <6.86E+OO O.OOE+OO 6.86E+OO Nb-95 <2.33E+OO O.OOE+OO 2.33E+OO 1-131 <1 .18E+01 O.OOE+OO 1.18E+01 Cs-134 <2.06E+OO O.OOE+OO 2.06E+OO Cs-137 <2.79E+OO O.OOE+OO 2.79E+OO Bala-140 <9.68E+OO O.OOE+OO 9.68E+OO Be-7 <2.79E+01 O.OOE+OO 2.79E+01 K-40 <4.15E+01 O.OOE+OO 4.15E+01 Sample ID: 474732 Sample Dates: 4/23/2018 - 7/16/2018 Nuclide Activity 2 Sigma Error MDA H3SW <-5.0E+01 O.OOE+OO 1.98E+02 Sample ID: 480268 Sample Dates : 6/18/2018 - 7/16/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <2 .22E+OO O.OOE+OO 2.22E+OO Co-58 <3.48E+OO O.OOE+OO 3.48E+OO Fe-59 <9 .52E+OO O.OOE+OO 9.52E+OO Co-60 <3.86E+OO O.OOE+OO 3.86E+OO Zn-65 <7 .10E+OO O.OOE+OO 7.10E+OO Zr-95 <7.47E+OO O.OOE+OO 7.47E+OO Nb-95 <6.36E+OO O.OOE+OO 6.36E+OO 1-131 <1.08E+01 O.OOE+OO 1.08E+01 Cs-134 <3.48E+OO O.OOE+OO 3.48E+OO Cs-137 <3.48E+OO O.OOE+OO 3.48E+OO Bala-140 <9.57E+OO O.OOE+OO 9.57E+OO Be-7 <3 .26E+01 O.OOE+OO 3.26E+01 K-40 <6 .60E+01 O.OOE+OO 6.60E+01 Sample ID: 482504 Sample Dates: 7/16/2018 -8/13/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <3 .21E+OO O.OOE+OO 3.21E+OO Co-58 <3.26E+OO O.OOE+OO 3.26E+OO Fe-59 <8.54E+OO O.OOE+OO 8.54E+OO Co-60 <3.25E+OO 0.00E+OO 3.25E+OO Zn-65 <5.47E+OO O.OOE+OO 5.47E+OO Zr-95 <5.47E+OO O.OOE+OO 5.47E+OO Nb-95 <3.26E+OO O.OOE+OO 3.26E+OO 1- 131 <1 .11E+01 O.OOE+OO 1.11E+01 Cs-134 <3.41E+OO O.OOE+OO 3.41 E+OO Cs-137 <3 .70E+OO O.OOE+OO 3.70E+OO Bala-140 <6.47E+OO O.OOE+OO 6.47E+OO Be-7 <3.24E+01 O.OOE+OO 3.24E+01 K-40 <5.09E+01 O.OOE+OO 5.09E+01 Sample ID: 484150 Sample Dates: 8/13/2018 -9/10/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <3.44E+OO O.OOE+OO 3.44E+OO Co-58 <3.70E+OO O.OOE+OO 3.70E+OO Fe-59 <4.70E+OO O.OOE+OO 4.70E+OO Co-60 <3 .03E+OO O.OOE+OO 3.03E+OO Zn-65 <6.11E+OO O.OOE+OO 6.11E+OO Report Generated@ 5/1/2019 11:57:36 -~ EnRad Laboratories Appendix E - Page 67 of 91 Duke Energy Annual Report - Appendix E (En ~ 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: SURFACE WATER Concentration (Activity): pCi/1 Sample Point 062 [ CONTROL - ENE @ 0.85 miles ]

Sample ID: 484150 Sample Dates : 8/13/2018 -9/10/2018 Nuclide Activity 2 Sigma Error MDA Zr-95 <6.28E+OO O.OOE+OO 6.28E+OO Nb-95 <4.19E+OO 0.00E+OO 4.19E+OO 1-131 <1.15E+01 O.OOE+OO 1.15E+01 Cs-134 <2.22E+OO O.OOE+OO 2.22E+OO Cs-137 <1.98E+OO O.OOE+OO 1.98E+OO Bala-140 <8.82E+OO O.OOE+OO 8.82E+OO Be-7 <3.01E+01 O.OOE+OO 3.01 E+01 K-40 <3 .74E+01 0.00E+OO 3.74E+01 Sample ID: 481637 Sample Dates: 7/16/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA H3SW <-1.4E+01 O.OOE+OO 1.85E+02 Sample ID: 486720 Sample Dates: 9/10/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <3.SOE+OO O.OOE+OO 3.SOE+OO Co-58 <3.29E+OO O.OOE+OO 3.29E+OO Fe-59 <6.67E+OO O.OOE+OO 6.67E+OO Co-60 <3.37E+OO O.OOE+OO 3.37E+OO Zn-65 <7.77E+OO 0.00E+OO 7.77E+OO Zr-95 <6.56E+OO O.OOE+OO 6.56E+OO Nb-95 <4.16E+OO O.OOE+OO 4.16E+OO 1-131 <1.14E+01 O.OOE+OO 1.14E+01 Cs-134 <2.80E+OO O.OOE+OO 2.80E+OO Cs-137 <3.54E+OO O.OOE+OO 3.54E+OO Bala-140 <1.02E+01 O.OOE+OO 1.02E+01 Be-7 <3.58E+01 O.OOE+OO 3.58E+01 K-40 <5.41E+01 O.OOE+OO 5.41 E+01 Sample ID: 488878 Sample Dates: 10/8/2018 - 11/5/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <3.SOE+OO O.OOE+OO 3.SOE+OO Co-58 <3.22E+OO O.OOE+OO 3.22E+OO Fe-59 <7.64E+OO O.OOE+OO 7.64E+OO Co-60 <3 .75E+OO 0.00E+OO 3.75E+OO Zn-65 <6.69E+OO O.OOE+OO 6.69E+OO Zr-95 <6.19E+OO O.OOE+OO 6.19E+OO Nb-95 <3.16E+OO O.OOE+OO 3.16E+OO 1-131 <1.10E+01 O.OOE+OO 1.10E+01 Cs-134 <3.31E+OO O.OOE+OO 3.31E+OO Cs-137 <2.73E+OO 0.00E+OO 2.73E+OO Bala-140 <7.75E+OO O.OOE+OO 7.75E+OO Be-7 <2.67E+01 O.OOE+OO 2.67E+01 K-40 5.68E+01 3.45E+01 5.01 E+01 Sample ID: 490827 Sample Dates: 11/5/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <4.68E+OO 0.00E+OO 4.68E+OO Co-58 <3.93E+OO O.OOE+OO 3.93E+OO Fe-59 <8.76E+OO 0.00E+OO 8.76E+OO Co-60 <3.08E+OO O.OOE+OO 3.08E+OO Zn-65 <9.21E+OO O.OOE+OO 9.21E+OO Zr-95 <7.43E+OO O.OOE+OO 7.43E+OO Nb-95 <3.41E+OO 0.00E+OO 3.41E+OO 1-131 <1.1 7E+01 O.OOE+OO 1.17E+01 Cs-134 <4.80E+OO 0.00E+OO 4.80E+OO Cs-137 <4.00E+OO O.OOE+OO 4.00E+OO Bala-140 <2.65E+OO 0.00E+OO 2.65E+OO Be-7 <3.42E+01 O.OOE+OO 3.42E+01 K-40 <6.18E+01 O.OOE+OO 6.18E+01 Sample ID: 488750 Sample Dates: 10/8/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA H3SW <7.15E+OO O.OOE+OO 1.87E+02 Sample ID: 492245 Sample Dates: 12/3/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <1.22E+OO O.OOE+OO 1.22E+OO Co-58 <1.77E+OO O.OOE+OO 1.77E+OO Fe-59 <3.15E+OO O.OOE+OO 3.15E+OO Co-60 <1.39E+OO 0.00E+OO 1.39E+OO Zn-65 <2.75E+OO O.OOE+OO 2.75E+OO Zr-95 <2.64E+OO O.OOE+OO 2.64E+OO Nb-95 <2.24E+OO O.OOE+OO 2.24E+OO 1-131 <1.06E+01 O.OOE+OO 1.06E+01 cf]~

Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 68 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: SURFACE WATER Concentration (Activity): pCi/1 Sample Point 062 [ CONTROL - ENE @ 0.85 miles ]

Sample ID: 492245 Sample Dates: 12/3/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.56E+OO 0.00E+OO 1.56E+OO Cs-137 <1 .52E+OO O.OOE+OO 1.52E+OO Bala-140 <5.95E+OO 0.00E+OO 5.95E+OO Be-7 <1.33E+01 O.OOE+OO 1.33E+01 K-40 3.87E+01 5.16E+01 1.27E+01 Sample Point 063.1 [ INDICATOR - E @ 0. 79 miles ]

Sample ID: 467357 Sample Dates: 1/2/2018 -1/29/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.73E+OO O.OOE+OO 2.73E+OO Co-58 <3.31E+OO 0.00E+OO 3.31E+OO Fe-59 <6.44E+OO O.OOE+OO 6.44E+OO Co-60 <2.83E+OO O.OOE+OO 2.83E+OO Zn-65 <6.03E+OO O.OOE+OO 6.03E+OO Zr-95 <6.6 1E+OO O.OOE+OO 6.61E+OO Nb-95 <4.43E+OO O.OOE+OO 4.43E+OO 1-131 <1.0BE+01 O.OOE+OO 1.0BE+01 Cs-134 <3.40E+OO 0.00E+OO 3.40E+OO Cs-137 <2.37E+OO O.OOE+OO 2.37E+OO Bala-140 <8.94E+OO O.OOE+OO 8.94E+OO Be-7 <2.98E+01 O.OOE+OO 2.98E+01 K-40 4.17E+01 3.41E+01 5.29E+01 Sample ID: 469591 Sample Dates: 1/29/2018 - 2/26/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.56E+OO 0.00E+OO 2.56E+OO Co-58 <2.94E+OO O.OOE+OO 2.94E+OO Fe-59 <5.68E+OO O.OOE+OO 5.68E+OO Co-60 <2.19E+OO O.OOE+OO 2.19E+OO Zn-65 <5.22E+OO O.OOE+OO 5.22E+OO Zr-95 <4.69E+OO O.OOE+OO 4.69E+OO Nb-95 <3.00E+OO O.OOE+OO 3.00E+OO 1-131 <1.04E+01 O.OOE+OO 1.04E+01 Cs-134 <3.3 1E+OO O.OOE+OO 3.31 E+OO Cs-137 <2.48E+OO O.OOE+OO 2.48E+OO Bala-140 <8.00E+OO O.OOE+OO 8.00E+OO Be-7 <2.BOE+01 O.OOE+OO 2.80E+01 K-40 <4.34E+01 O.OOE+OO 4.34E+01 Sample ID: 472535 Sample Dates : 2/26/2018 - 3/26/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <1.52E+OO O.OOE+OO 1.52E+OO Co-58 <1.54E+OO O.OOE+OO 1.54E+OO Fe-59 <4.22E+OO 0.00E+OO 4.22E+OO Co-60 <1.39E+OO O.OOE+OO 1.39E+OO Zn-65 <3.48E+OO O.OOE+OO 3.48E+OO Zr-95 <3.12E+OO O.OOE+OO 3.12E+OO Nb-95 <2.25E+OO O.OOE+OO 2.25E+OO 1-131 <1.08E+01 O.OOE+OO 1.08E+01 Cs-134 <1.79E+OO O.OOE+OO 1.79E+OO Cs-137 <1.77E+OO O.OOE+OO 1.77E+OO Bala-140 <5.59E+OO 0.00E+OO 5.59E+OO Be-7 <1.87E+01 O.OOE+OO 1.87E+01 K-40 5.18E+01 1.74E+01 2.20E+01 Sample ID: 467536 Sample Dates: 1/2/2018 -4/23/2018 Nuclide Activity 2 Sigma Error MDA H3SW 5.61E+03 2.32E+02 1.82E+02 Sample ID: 474173 Sample Dates: 3/26/2018 -4/23/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.98E+OO O.OOE+OO 2.98E+OO Co-58 <3.44E+OO 0.00E+OO 3.44E+OO Fe-59 <5.99E+OO O.OOE+OO 5.99E+OO Co-60 <2. 98E+OO O.OOE+OO 2.98E+OO Zn-65 <6.38E+OO O.OOE+OO 6.38E+OO Zr-95 <6 .11E+OO O.OOE+OO 6.11E+OO Nb-95 <4.33E+OO O.OOE+OO 4.33E+OO 1-131 <1 .15E+01 O.OOE+OO 1.15E+01 Cs-134 <2.97E+OO 0.00E+OO 2.97E+OO Cs-137 <3.51E+OO O.OOE+OO 3.51E+OO Bala-140 <6.30E+OO O.OOE+OO 6.30E+OO Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 69 of 91 Duke Energy Annual Report - Appendix E (E~ _) 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: SURFACE WATER Concentration (Activity): pCi/1 Sample Point 063.1 [ INDICATOR- E@ 0.79 miles]

Sample ID: 474173 Sample Dates: 3/26/2018 - 4/23/2018 Nuclide Activity 2 Sigma Error MDA Be-7 <2.43E+01 0.00E+OO 2.43E+01 K-40 1.05E+01 3.64E+01 4.17E+01 Sample ID: 475559 Sample Dates: 4/23/2018 - 5/21/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <3.18E+OO 0.00E+OO . 3.18E+OO Co-58 <3.21E+OO O.OOE+OO 3.21E+OO Fe-59 <5.31E+OO O.OOE+OO 5.31E+OO Co-60 <3.56E+OO 0.00E+OO 3.56E+OO Zn-65 <8.04E+OO 0.00E+OO 8.04E+OO Zr-95 <6.28E+OO O.OOE+OO 6.28E+OO Nb-95 <3.61E+OO O.OOE+OO 3.61E+OO 1-131 <1. 11E+01 0.00E+OO 1.11E+01 Cs-134 <3.73E+OO 0.00E+OO 3.73E+OO Cs-137 <2 .90E+OO O.OOE+OO 2.90E+OO Bala-140 <7.47E+OO 0.00E+OO 7.47E+OO Be-7 <2 .83E+01 O.OOE+OO 2.83E+01 K-40 <5.16E+01 O.OOE+OO 5.16E+01 Sample ID: 478446 Sample Dates: 5/21/2018 - 6/18/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.85E+OO O.OOE+OO 2.85E+OO Co-58 <4.71E+OO O.OOE+OO 4.71 E+OO Fe-59 <7.56E+OO O.OOE+OO 7.56E+OO Co-60 <2.14E+OO O.OOE+OO 2.14E+OO Zn-65 <6.44E+OO 0.00E+OO 6.44E+OO Zr-95 <6.BOE+OO O.OOE+OO 6.BOE+OO Nb-95 <4.93E+OO O.OOE+OO 4.93E+OO 1-131 <1.20E+01 O.OOE+OO 1.20E+01 Cs-134 <3.62E+OO 0.00E+OO 3.62E+OO Cs-137 <4.23E+OO O.OOE+OO 4.23E+OO Bala-140 <6.00E+OO O.OOE+OO 6.00E+OO Be-7 <2.70E+01 O.OOE+OO 2.70E+01 K-40 5.13E+01 3.30E+01 4.39E+01 Sample ID: 474733 Sample Dates: 4/23/2018 -7/16/2018 Nuclide Activity 2 Sigma Error MDA H3SW 3.41E+03 1.97E+02 1.97E+02 Sample ID: 480269 Sample Dates: 6/18/2018 - 7/16/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <3.38E+OO O.OOE+OO 3.38E+OO Co-58 <4.22E+OO 0.00E+OO 4.22E+OO Fe-59 <6.84E+OO O.OOE+OO 6.84E+OO Co-60 <3.46E+OO O.OOE+OO 3.46E+OO Zn-65 <6.37E+OO O.OOE+OO 6.37E+OO Zr-95 <8.22E+OO 0.00E+OO 8.22E+OO Nb-95 <6.02E+OO O.OOE+OO 6.02E+OO 1-131 <1 .03E+01 0.00E+OO 1.03E+01 Cs-134 <3.99E+OO O.OOE+OO 3.99E+OO Cs-137 <4.67E+OO O.OOE+OO 4.67E+OO Bala-140 <1.07E+01 O.OOE+OO 1.07E+01 Be-7 <4.20E+01 O.OOE+OO 4.20E+01 K-40 <6.22E+01 O.OOE+OO 6.22E+01 Sample ID: 482505 Sample Dates: 7/16/2018 - 8/13/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.97E+OO 0.00E+OO 2.97E+OO Co-58 <2.86E+OO O.OOE+OO 2.86E+OO Fe-59 <5.56E+OO 0.00E+OO 5.56E+OO Co-60 <2.12E+OO O.OOE+OO 2.12E+OO Zn-65 <5 .12E+OO O.OOE+OO 5.12E+OO Zr-95 <6.39E+OO O.OOE+OO 6.39E+OO Nb-95 <3 .98E+OO O.OOE+OO 3.98E+OO 1-131 <1.19E+01 0.00E+OO 1.19E+01 Cs-134 <3.17E+OO O.OOE+OO 3.17E+OO Cs-137 <3.11E+OO O.OOE+OO 3.11E+OO Bala-140 <6.18E+OO O.OOE+OO 6.18E+OO Be-7 <2.96E+01 0.00E+OO 2.96E+01 K-40 3.18E+01 1.87E+01 2.13E+01 Sample ID: 484151 Sample Dates: 8/13/2018 - 9/10/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <3.63E+OO 0.00E+OO 3.63E+OO Co-58 <4.07E+OO O.OOE+OO 4.07E+OO EnRad Laboratories

(~~

Report Generated@ 5/1/2019 11 :57:36 Appendix E - Page 70 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Medfa Type: SURFACE WATER Concentration (Activity): pCi/1 Sample Point 063.1 [ INDICATOR - E@0.79 miles]

Sample ID: 484151 Sample Dates: 8/13/2018 - 9/10/2018 Nuclide Activity 2 Sigma Error MDA Fe-59 <8.28E+OO O.OOE+OO 8.28E+OO Co-60 <3.92E+OO O.OOE+OO 3.92E+OO Zn-65 <6.86E+OO O.OOE+OO 6.86E+OO Zr-95 <6.18E+OO O.OOE+OO 6.18E+OO Nb-95 <4.30E+OO O.OOE+OO 4.30E+OO 1-131 <1.13E+01 O.OOE+OO 1.13E+01 Cs-134 <3.89E+OO O.OOE+OO 3.89E+OO Cs-137 <3.52E+OO O.OOE+OO 3.52E+OO Bala-140 <1 .95E+OO O.OOE+OO 1.95E+OO Be-7 <2.97E+01 O.OOE+OO 2.97E+01 K-40 <5.21E+01 O.OOE+OO 5.21 E+01 Sample ID: 481638 Sample Dates: 7/16/2018 -10/8/2018 Nuclide Activity 2 Sigma Error MDA H3SW 1.29E+03 1.45E+02 1.86E+02 Sample ID: 486721 Sample Dates : 9/10/2018 - 10/8/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <3.57E+OO O.OOE+OO 3.57E+OO Co-58 <3.42E+OO O.OOE+OO 3.42E+OO Fe-59 <7.09E+OO O.OOE+OO 7.09E+OO Co-60 <3.84E+OO O.OOE+OO 3.84E+OO Zn-65 <6.04E+OO O.OOE+OO 6.04E+OO Zr-95 <6.73E+OO O.OOE+OO 6.73E+OO Nb-95 <4.99E+OO O.OOE+OO 4.99E+OO 1-131 <1.15E+01 O.OOE+OO 1.15E+01 Cs-134 <4.28E+OO O.OOE+OO 4.28E+OO Cs-137 <2.SSE+OO O.OOE+OO 2.SSE+OO Bala-140 <9.11E+OO O.OOE+OO 9.11E+OO Be-7 <3.23E+01 O.OOE+OO 3.23E+01 K-40 4.34E+01 3.14E+01 4.43E+01 Sample ID: 488879 Sample Dates : 10/8/2018 - 11/5/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.SOE+OO O.OOE+OO 2.SOE+OO Co-58 <3.52E+OO O.OOE+OO 3.52E+OO Fe-59 <5.89E+OO O.OOE+OO 5.89E+OO Co-60 <2.99E+OO O.OOE+OO 2.99E+OO Zn-65 <6.49E+OO O.OOE+OO 6.49E+OO Zr-95 <6.0SE+OO O.OOE+OO 6.0SE+OO Nb-95 <4.41E+OO O.OOE+OO 4.41E+OO 1-131 <1.19E+01 O.OOE+OO 1.19E+01 Cs-134 <3.29E+OO O.OOE+OO 3.29E+OO Cs-137 <3.59E+OO O.OOE+OO 3.59E+OO Bala-140 <7.69E+OO O.OOE+OO 7.69E+OO Be-7 <3.72E+01 O.OOE+OO 3.72E+01 K-40 6.28E+01 2.97E+01 3.56E+01 Sample ID: 490828 Sample Dates: 11/5/2018 -12/3/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.73E+OO O.OOE+OO 2.73E+OO Co-58 <3.16E+OO O.OOE+OO 3.16E+OO Fe-59 <4.64E+OO O.OOE+OO 4.64E+OO Co-60 <2.78E+OO O.OOE+OO 2.78E+OO Zn-65 <5.88E+OO O.OOE+OO 5.88E+OO Zr-95 <4.38E+OO O.OOE+OO 4.38E+OO Nb-95 <3.96E+OO O.OOE+OO 3.96E+OO 1-131 <1.19E+01 O.OOE+OO 1.19E+01 Cs-134 <3.66E+OO O.OOE+OO 3.66E+OO Cs- 137 <3.25E+OO O.OOE+OO 3.25E+OO Bala-140 <5.61E+OO O.OOE+OO 5.61 E+OO Be-7 <2.77E+01 O.OOE+OO 2.77E+01 K-40 3.98E+01 2.36E+01 3.19E+01 Sample ID: 488751 Sample Dates: 10/8/2018

12/31/2018 Nuclide Activity 2 Sigma Error MDA H3SW 3.75E+03 2.01E+02 1.87E+02 Sample ID: 492246 Sample Dates : 12/3/2018 -12/31/2018 Nuclide Activity 2 Sigma Error MDA Mn-54 <1 .04E+OO O.OOE+OO 1.04E+OO Co-58 <1 .29E+OO O.OOE+OO 1.29E+OO Fe-59 <2.44E+OO O.OOE+OO 2.44E+OO Co-60 <9 .11E-01 O.OOE+OO 9.11E-01 Zn-65 <2.13E+OO O.OOE+OO 2.13E+OO Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Duke Energy Annual Report - Appendix E ((!J _) 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 71 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: SURFACE WATER Concentration (Activity): pCi/i Sample Point 063.1 [ INDICATOR- E@ 0.79 miles]

Sample ID: 492246 Sample Dates: 12/3/2018 - 12/31/2018 Nuclide Activity 2 Sigma Error MDA Zr-95 <1.99E+OO O.OOE+OO 1.99E+OO Nb-95 <1.56E+OO O.OOE+OO 1.56E+OO 1-131 <1.08E+01 O.OOE+OO 1.08E+01 Cs-134 <1.16E+OO 0.00E+OO 1.16E+OO Cs-137 <9.29E-01 O.OOE+OO 9.29E-01 Bala-140 <4.15E+OO 0.00E+OO 4.15E+OO Be-7 <1 .08E+01 0.00E+OO 1.08E+01 K-40 1.78E+01 1.10E+01 1.72E+01 Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 020 [ INDICATOR - N @ 0.16 miles ] TLD RING TLD_INNER Sample ID: 470263 Sample Dates : 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 23.01 Sample ID: 477221 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 19.35 Sample ID: 483851 Sample Dates : 6112/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 18.02 Sample ID: 490635 Sample Dates: 9111/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 20.43 Sample Point 021 [ INDICATOR - NNE@ 0.25 miles] TLD RING TLD_INNER Sample ID: 470264 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 16.52 Sample ID: 477222 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 15.26 Sample ID: 483852 Sample Dates : 6/12/2018 -9/1112018 Nuclide Activity mR/Std Qtr 14.51 Sample ID: 490636 Sample Dates : 9/11/2018 - 12/11/2018 Nuclide Activity mR/Std Qtr 16.89 Sample Point 022 [ INDICATOR - NE@ 0.53 miles] TLD RING TLD_INNER Sample ID: 470265 Sample Dates : 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 25 .97 Sample ID: 477223 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 24.56 Sample ID: 483853 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/StdQtr 21.33 Sample ID: 490637 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 24.35 Sample Point 023 [ INDICATOR - ENE@ 0.93 miles] TLD RING TLD_INNER Sample ID: 470266 Sample Dates: 12/1212017 - 3/13/2018 Nuclide Activity mRIStd Qtr 25 .01 Sample ID: 477224 Sample Dates: 311312018 - 6/1212018 Nuclide Activity mR/Std Qtr 23 .85 Sample ID: 483854 Sample Dates: 6/12/2018 - 9/1112018 Nuclide Activity mR/Std Qtr 20.90 Sample ID: 490638 Sample Dates : 9111/2018 - 12111/2018 Nuclide Activity mR/Std Qtr 22 .00 Sample Point 024 [ INDICATOR - E@ 0.81 miles] TLD RING TLD_INNER Sample ID: 470267 Sample Dates : 12/12/2017 -3113/2018 Nuclide Activity mR/Std Qtr 32.57 Sample ID: 477225 Sample Dates: 3/1312018 - 6/1212018 Nuclide Activity mR/Std Qtr 30 .01 Report Generated @ 5/1/2019 11 :57:36

_,.. --... EnRad Laboratories Duke Energy Annual Report - Appendix E (En _;J 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 72 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 024 [ INDICATOR - E @ 0.81 miles] TLD RING TLD_INNER Sample ID: 483855 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Otr 27.86 Sample ID: 490639 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 29.49 Sample Point 025 [ INDICATOR - ESE @ 0.42 miles] TLD RING TLD_INNER Sample ID: 470268 Sample Dates : 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 20.33 Sample ID: 477226 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Otr 18.13 Sample ID: 483856 Sample Dates : 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Otr 16.72 Sample ID: 490640 Sample Dates : 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 17.60 Sample Point 026 [ INDICATOR - SE @ 0.34 miles ] TLD RING TLD_INNER Sample ID: 470269 Sample Dates : 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Otr 18.51 Sample ID: 477227 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 18.16 Sample ID: 483857 Sample Dates: 6/12/2018 -9/11/2018 Nuclide Activity mR/Std Qtr 17.13 Sample ID: 490641 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 17.12 Sample Point 027 [ INDICATOR - SSE @ 0.49 miles ] TLD RING TLD_INNER Sample ID: 470270 Sample Dates : 12/12/2017

3/13/2018 Nuclide Activity mR/Std Qtr 19.79 Sample ID: 477228 Sample Dates: 3/13/2018

6/12/2018 Nuclide Activity mR/Std Otr 19.96 Sample ID: 483858 Sample Dates : 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 18.29 Sample ID: 490642 Sample Dates : 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Otr 19.34 Sample Point 028 [ INDICATOR - S@ 0.46 miles] TLD RING TLD_INNER Sample ID: 470271 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 17.10 Sample ID: 477229 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Otr 17.06 Sample ID: 483859 Sample Dates : 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 17.32 Sample ID: 490643 Sample Dates : 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Otr 18.72 Sample Point 029 [ INDICATOR - SSW@ 0.56 miles] TLD RING TLD_INNER Sample ID: 470272 Sample Dates: 12/12/2017

3/13/2018

Nuclide Activity mR/Std Otr 18.52 Sample ID: 477230 Sample Dates : 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 16.04 Sample ID: 483860 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/StdOtr 15.39 Sample ID: 490644 Sample Dates : 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 17.69 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 73 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville. North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: i'LD Concentration (Activity): mR/Standard Quarter Sample Point 030 [ INDICATOR - SW @ 0.42 mites ] TLD RING TLD_INNER Sample ID: 470273 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 21 .32 Sample ID: 477231 Sample Dates : 3/13/2018 -6/12/2018 Nuclide Activity mR/Std Qtr 18.68 Sample ID: 483861 Sample Dates: 6/12/2018 -9/11/2018 Nuclide Activity mR/Std Qtr 18.00 Sample ID: 490645 Sample Dates: 9/11/2018

12/11/2018 Nuclide Activity mR/Std Qtr 18.37 Sample Point 031 [ INDICATOR - WSW@ 0.27 miles] TLD RING TLD_INNER Sample ID: 470274 Sample Dates: 12/12/2017 -3/13/2018 Nuclide Activity mR/Std Qtr 18.52 Sample ID: 477232 Sample Dates: 3/13/2018 -6/12/2018 Nuclide Activity mR/Std Qtr 17.48 Sample ID: 483862 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 16.48 Sample ID: 490646 Sample Dates : 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 18.45 Sample Point 032 [ INDICATOR-WNW@ 0.19 miles] TLD RING TLD_INNER Sample ID: 470275 Sample Dates : 12/12/2017 -3/13/2018 Nuclide Activity mR/Std Qtr 22.58 Sample ID: 477233 Sample Dates : 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 20.39 Sample ID: 483863 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 18.14 Sample ID: 490647 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 20.94 Sample Point 033 [ INDICATOR - WNW@ 0.21 miles] TLD RING TLD_INNER Sample ID: 470276 Sample Dates: 12/12/2017. 3/13/2018 Nuclide Activity mR/Std Qtr 18.96 Sample ID: 477234 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 18.94 Sample ID: 483864 Sample Dates: 6/12/2018

9/11/2018 Nuclide Activity mR/Std Qtr 16.62 Sample ID: 490648 Sample Dates: 9/11/2018 - 12/11/2018 Nuclide Activity mR/Std Qtr 19.55 Sample Point 034 [INDICATOR* NW@ 0.22 miles] TLD RING TLD_INNER Sample ID: 470277 Sample Dates : 12/12/2017

3/13/2018 Nuclide Activity mR/Std Qtr 21 .73 Sample ID: 477235 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 18.59 Sample ID: 483865 Sample Dates: 6/12/2018

9/11/2018 Nuclide Activity mR/Std Qtr 18.01 Sample ID: 490649 Sample Dates: 9/11/2018 - 12/11/2018 Nuclide Activity mR/Std Qtr 19.66 Sample Point 035 [INDICATOR* NNW@ 0.17 miles] TLD RING TLD_INNER Sample ID: 470278 Sample Dates: 12/12/2017

3/13/2018 Nuclide Activity mR/Std Qtr 26.47 Sample ID: 477236 Sample Dates : 3/13/2018

6/12/2018 Nuclide Activity mR/Std Qtr 24.53 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 74 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 035 [ INDICATOR- NNW@0.17 miles] TLD RING TLD_INNER Sample ID: 483866 Sample Dates: 6/12/2018

9/11/2018 Nuclide Activity mR/Std Qtr 22 .87 Sample ID: 490650 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 24.15 Sample Point 036 [ INDICATOR - N @ 4.18 miles ] TLD RING TLD_OUTER Sample ID: 470279 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 29.58 Sample ID: 477237 Sample Dates : 3/13/2018

6/12/2018 Nuclide Activity mR/Std Qtr 27.93 Sample ID: 483867 Sample Dates: 6/12/2018

9/11/2018 Nuclide Activity mR/Std Qtr 25.08 Sample ID: 490651 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 27.38 Sample Point 037 [ INDICATOR - NNE @ 4.85 miles] TLD RING TLD_OUTER Sample ID: 470280 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 20.87 Sample ID: 477238 Sample Dates: 3/13/2018

6/12/2018 Nuclide Activity mR/Std Qtr 19.20 Sample ID: 483868 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 16.30 Sample ID: 490652 Sample Dates: 9/11/2018

12/11/2018 Nuclide Activity mR/Std Qtr 18.99 Sample Point 038 [ INDICATOR - NE@ 4.24 miles] TLD RING TLD_OUTER Sample ID: 470281 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 24.60 Sample ID: 477239 Sample Dates: 3/13/2018

6/12/2018 Nuclide Activity mR/Std Qtr 22.72 Sample ID: 483869 Sample Dates: 6/12/2018. 9/11/2018 Nuclide Activity mR/Std Qtr 20.37 Sample ID: 490653 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 23.17 Sample Point 039 [INDICATOR* ENE @ 4.02 miles] TLD RING TLD_OUTER Sample ID: 470282 Sample Dates: 12/12/2017

3/13/2018 Nuclide Activity mR/Std Qtr 25.08 Sample ID: 477240 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 25.48 Sample ID: 483870 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 23.23 Sample ID: 490654 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 26 .05 Sample Point 040 [INDICATOR* E@ 4.74 miles] TLD RING TLD_OUTER Sample ID: 470283 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 31 .72 Sample ID: 477241 Sample Dates : 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 28.11 Sample ID: 483871 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 24 .65 Sample ID: 490655 Sample Dates: 9/11/2018

12/11/2018 Nuclide Activity mR/Std Qtr 26 .97 Report Generated@ 5/1/2019 11:57:36 Duke Energy Annual Report - Appendix E (ln-- __)--- EnRad Laboratories 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 75 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 041 [ INDICATOR - ESE@ 4.25 miles] TLD RING TLD_OUTER Sample ID: 470284 Sample Dates: 12/12/2017 -3/13/2018 Nuclide Activity mR/Std Qtr 19.24 Sample ID: 477242 Sample Dates: 3/13/2018 -6/12/2018 Nuclide Activity mR/Std Qtr 17.87 Sample ID: 483872 Sample Dates : 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 16.81 Sample ID: 490656 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 17.93 Sample Point 042 [ INDICATOR - SE @ 4.93 miles] TLD RING TLD_OUTER Sample ID: 470285 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 28.08 Sample ID: 477243 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 27.00 Sample ID: 483873 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 25.99 Sample ID: 490657 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 26.70 Sample Point 043 [ INDICATOR - SSE@ 4.09 miles] TLD RING TLD_OUTER Sample ID: 470286 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Otr 26.71 Sample ID: 477244 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 24.81 Sample ID: 483874 Sample Dates : 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 22.71 Sample ID: 490658 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 25.08 Sample Point 044 [INDICATOR* S@ 3.96 miles] TLD RING TLD_OUTER Sample ID: 470287 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 21.80 Sample ID: 477245 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 19.64 Sample ID: 483875 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 19.30 Sample ID: 490659 Sample Dates : 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 19.57 Sample Point 045 [ INDICATOR - SSW@ 4.78 miles] TLD RING TLD_OUTER Sample ID: 470288 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 19.03 Sample ID: 477246 Sample Dates : 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 17.91 Sample ID: 483876 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 16.89 Sample ID: 490660 Sample Dates : 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 18.39 Sample Point 046 [ INDICATOR - SW@ 4.61 miles] TLD RING TLD_OUTER Sample ID: 470289 Sample Dates: 12/12/2017 -3/13/2018 Nuclide Activity mR/Std Qtr 24.94 Sample ID: 477247 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 24.98 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 76 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 046 [ INDICATOR - SW@ 4.61 miles ] TLD RING TLD_OUTER Sample ID: 483877 Sample Dates: 6/12/2018 -9/11/2018 Nuclide Activity mR/Std Qtr 23.28 Sample ID: 490661 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 24.44 Sample Point 047 [ INDICATOR - WSW@ 3.58 miles] TLD RING TLD_OUTER Sample ID: 470290 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 25.44 Sample ID: 477248 Sample Dates: 3/13/2018 -6/1212018 Nuclide Activity mR/Std Qtr 23.15 Sample ID: 483878 Sample Dates : 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 22.30 Sample Point 048 [ INDICATOR - W@ 3.64 miles] TLD RING TLD_OUTER Sample ID: 470291 Sample Dates : 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 27.21 Sample ID: 477249 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 26.82 Sample ID: 483879 Sample Dates: 6/12/2018 -9/11/2018 Nuclide Activity mR/Std Qtr 23 .38 Sample ID: 490662 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 26.26 Sample Point 049 [ INDICATOR - WNW@ 3.6 miles] TLD RING TLD_OUTER Sample ID: 470292 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 24.18 Sample ID: 477250 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 22.71 Sample ID: 483880 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 21.45 Sample ID: 490663 Sample Dates : 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 22 .72 Sample Point 050 [ INDICATOR - NW@ 3.53 miles] TLD RING TLD_OUTER Sample ID: 470293 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 19.44 Sample ID: 477251 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 19.19 Sample ID: 483881 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 17.85 Sample ID: 490664 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 20.49 Sample Point 051 [ INDICATOR - NNW@ 4.64 miles] TLD RING TLD_OUTER Sample ID: 470294 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 21.90 Sample ID: 477252 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 18.77 Sample ID: 483882 Sample Dates : 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 18.52 Sample ID: 490665 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 20.49 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 77 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 052 [INDICATOR* ENE@ 12.4 miles J TLD RING TLD_SPEC Sample ID: 470295 Sample Dates : 12/12/2017

3/13/2018 Nuclide Activity mR/Std Qtr 27 .72 Sample ID: 477253 Sample Dates : 3/13/2018

6/12/2018 Nuclide Activity mR/Std Qtr 26.76 Sample ID: 483883 Sample Dates: 6/12/2018

9/11/2018 Nuclide Activity mR/Std Qtr 22.29 Sample ID: 490666 Sample Dates : 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 24.02 Sample Point 053 [INDICATOR* E@ 11.7 miles] TLD RING TLD_SPEC Sample ID: 470296 Sample Dates : 12/12/2017

3/13/2018 Nuclide Activity mR/Std Qtr 29 .98 Sample ID: 477254 Sample Dates : 3/13/2018

6/12/2018 Nuclide Activity mR/Std Qtr 24.87 Sample ID: 483884 Sample Dates : 6/12/2018

9/11/2018 Nuclide Activity mR/Std Qtr 24.02 Sample ID: 490667 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 26.54 Sample Point 054 [ INDICATOR

ESE @ 8.6 miles J TLD RING TLD_SPEC Sample ID: 470297 Sample Dates: 12/12/2017

3/13/2018 Nuclide Activity mR/StdQtr 23.41 Sample ID: 477255 Sample Dates: 3/13/2018

6/12/2018 Nuclide Activity mR/StdQtr 19.16 Sample ID: 483885 Sample Dates: 6/12/2018

9/11/2018 Nuclide Activity mR/Std Qtr 17.77 Sample ID: 490668 Sample Dates: 9/11/2018 - 12/11/2018 Nuclide Activity mR/Std Qtr 20 .09 Sample Point 055 [ INDICATOR

SSE @ 9.27 miles J TLD RING TLD_SPEC Sample ID: 470298 Sample Dates: 12/12/2017

3/13/2018 Nuclide Activity mR/Std Qtr 17.06 Sample ID: 477256 Sample Dates: 3/13/2018

6/12/2018 Nuclide Activity mR/StdQtr 15.81 Sample ID: 483886 Sample Dates : 6/12/2018

9/11/2018 Nuclide Activity mR/StdQtr 14.98 Sample ID: 490669 Sample Dates : 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 16.61 Sample Point 056 [INDICATOR* SSW@7.3 miles J TLD RING TLD_SPEC Sample ID: 470299 Sample Dates: 12/12/2017. 3/13/2018 Nuclide Activity mR/Std Qtr 24 .13 Sample ID: 477257 Sample Dates: 3/13/2018

6/12/2018 Nuclide Activity mR/StdQtr 24 .52 Sample ID: 483887 Sample Dates : 6/12/2018

9/11/2018 Nuclide Activity mR/Std Qtr 22.56 Sample ID: 490670 Sample Dates : 9/11/2018

12/11/2018 Nuclide Activity mR/Std Qtr 24.63 Sample Point 057 [ INDICATOR

SW @ 8.42 miles] TLD RING TLD_SPEC Sample ID: 470300 Sample Dates: 12/12/2017

3/13/2018 Nuclide Activity mR/Std Qtr 28 .51 Sample ID: 477258 Sample Dates: 3/13/2018

6/12/2018 Nuclide Activity mR/StdQtr 25.86 Report Generated@ 5/1/2019 11:57:36 Duke Energy Annual Report - Appendix E

~-

(En_) --- EnRad Laboratories 13339 Hagers Ferry Road Huntersville, North Carolina 28078 Appendix E - Page 78 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 057 [ INDICATOR - SW@ 8.42 miles] TLD RING TLD_SPEC Sample ID: 483888 Sample Dates: 6/12/2018 -9/11/2018 Nuclide Activity mR/Std Qtr 21.25 Sample ID: 490671 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 20.47 Sample Point 058 [ CONTROL - WSW@ 9.39 miles J TLD RING TLD_CTRL Sample ID: 470301 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 34.21 Sample ID: 477259 Sample Dates : 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 33.11 Sample ID: 483889 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 28.57 Sample ID: 490672 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 31.07 Sample Point 059 [ INDICATOR - NW@ 9.2 miles J TLD RING TLD_SPEC Sample ID: 470302 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 27.01 Sample ID: 477260 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 24.66 Sample ID: 483890 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 23 .50 Sample ID: 490673 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 25.94 Sample Point 076 [ INDICATOR-W@ 0.19 miles] TLD RING TLD_INNER Sample ID: 470303 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 29.18 Sample ID: 477261 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 26.54 Sample ID: 483891 Sample Dates: 6/12/2018 -9/11/2018 Nuclide Activity mR/Std Qtr 22.50 Sample ID: 490674 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 26.24 Sample Point 077 [ INDICATOR - SW@ 1 miles] TLD RING TLD_INNER Sample ID: 470304 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 21.15 Sample ID: 477262 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 18.14 Sample ID: 483892 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 17.10 Sample ID: 490675 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 18.98 Sample Point 078.1 [ INDICATOR-WSW@ 0.53 miles] TLD RING TLD_INNER Sample ID: 470305 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/StdQtr 29.57 Sample ID: 477263 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 30.44 Sample ID: 483893 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 25.41 Sample ID: 490676 Sample Dates : 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 27.28 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 79 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: TLD *concentration (Activity): mR/Standard Quarter Sample Point 081 [ CONTROL

SE @ 9.33 miles ] TLD RING TLD_CTRL Sample ID: 470306 Sample Dates : 12/12/2017

3/13/2018 Nuclide Activity mR/Std Qtr 27.43 Sample ID: 477264 Sample Dates: 3/13/2018

6/12/2018 Nuclide Activity mR/Std Qtr 22 .86 Sample ID: 483894 Sample Dates: 6/12/2018. 9/11/2018 Nuclide Activity mR/Std Qtr 22.59 Sample ID: 490677 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 25.03 Sample Point 085 [INDICATOR* NNW@ 0.88 miles] TLD RING TLD_INNER Sample ID: 470307 Sample Dates : 12/12/2017

3/13/2018 Nuclide Activity mR/Std Qtr 21.21 Sample ID: 477265 Sample Dates : 3/13/2018

6/12/2018 Nuclide Activity mR/Std Qtr 20 .93 Sample ID: 483895 Sample Dates: 6/12/2018

9/11/2018 Nuclide Activity mR/Std Qtr 18.99 Sample ID: 490678 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 19.88 Sample Point 086 [INDICATOR* NW@ 0.83 miles] TLD RING TLD_INNER Sample ID: 470308 Sample Dates: 12/12/2017

3/13/2018 Nuclide Activity mR/Std Qtr 17.81 Sample ID: 477266 Sample Dates : 3/13/2018

6/12/2018 Nuclide Activity mR/Std Qtr 17.99 Sample ID: 483896 Sample Dates : 6/12/2018

9/11/2018 Nuclide Activity mR/Std Qtr 16.52 Sample ID: 490679 Sample Dates : 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 16.63 Sample Point 087 [INDICATOR* WNW@ 1.33 miles] TLD RING TLD_INNER Sample ID: 470309 Sample Dates : 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 19.28 Sample ID: 477267 Sample Dates : 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 19.02 Sample ID: 483897 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 17.40 Sample ID: 490680 Sample Dates : 9/11/2018 - 12/11/2018 Nuclide Activity mR/Std Qtr 18.44 Sample Point 088 [INDICATOR* SSW@ 1 miles] TLD RING TLD_INNER Sample ID: 470310 Sample Dates : 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 22.00 Sample ID: 477268 Sample Dates : 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 22.82 Sample ID: 483898 Sample Dates : 6/12/2018 -9/11/2018 Nuclide Activity mR/Std Qtr 20.75 Sample ID: 490681 Sample Dates : 9/11/2018

12/11/2018 Nuclide Activity mR/Std Qtr 21.79 Sample Point 089 [ INDICATOR- S@ 1.19 miles] TLD RING TLD_INNER Sample ID: 470311 Sample Dates : 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 24 .69 Sample ID: 477269 Sample Dates: 3/13/2018

6/12/2018 Nuclide Activity mR/Std Qtr 25 .15 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 80 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 089 [ INDICATOR - S@ 1.19 miles] TLD RING TLD_INNER Sample ID: 483899 Sample Dates: 6/12/2018

9/11/2018 Nuclide Activity mR/Std Qtr 22.49 Sample ID: 490682 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 23.85 Sample Point 090 [ INDICATOR - SE@ 0.79 miles] TLD RING TLD_INNER Sample ID: 470312 Sample Dates: 12/12/2017 - 3/13/2018 Nuclide Activity mR/Std Qtr 27 .00 Sample ID: 477270 Sample Dates: 3/13/2018 - 6/12/2018 Nuclide Activity mR/Std Qtr 25.62 Sample ID: 483900 Sample Dates: 6/12/2018 - 9/11/2018 Nuclide Activity mR/Std Qtr 23.13 Sample ID: 490683 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 24.41 Sample Point 092 [ INDICATOR - WSW@ 3.62 miles] TLD RING TLD_OUTER Sample ID: 490684 Sample Dates: 9/11/2018 -12/11/2018 Nuclide Activity mR/Std Qtr 22. 95 Media Type: VEGETATION Concentration (Activity): pCi/kg wet Sample Point 077 [ INDICATOR - SW@ 1 miles ]

Sample ID: 466019 Sample Dates: 1/2/2018 -1/2/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.12E+01 O.OOE+OO 2.12E+01 Co-58 <2.11E+01 O.OOE+OO 2.11E+01 Fe-59 <4.37E+01 O.OOE+OO 4.37E+01 Co-60 <2.20E+01 0.00E+OO 2.20E+01 Zn-65 <4.43E+01 O.OOE+OO 4.43E+01 Zr-95 <3.84E+01 0.00E+OO 3.84E+01 Nb-95 <2 .43E+01 O.OOE+OO 2.43E+01 1-131 <3.79E+01 O.OOE+OO 3.79E+01 Cs-134 <2.38E+01 O.OOE+OO 2.38E+01 Cs-137 <2.17E+01 0.00E+OO 2.17E+01 Bala-140 <3.79E+01 O.OOE+OO 3.79E+01 Be-7 1.48E+03 2.4SE+02 2.93E+02 K-40 3.15E+03 4.43E+02 4.18E+02 Sample ID: 467680 Sample Dates: 2/5/2018

2/5/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.65E+01 0.00E+OO 3.65E+01 Co-58 <3.01E+01 0.00E+OO 3.01 E+01 Fe-59 <7.09E+01 O.OOE+OO 7.09E+01 Co-60 <2.59E+01 O.OOE+OO 2.59E+01 Zn-65 <7.4DE+01 O.OOE+OO 7.40E+01 Zr-95 <6.06E+01 O.OOE+OO 6.06E+01 Nb-95 <4.15E+01 O.OOE+OO 4.15E+01 1-131 <4.76E+01 O.OOE+OO 4.76E+01 Cs-134 <3.62E+01 O.OOE+OO 3.62E+01 Cs-137 <3.93E+01 0.00E+OO 3.93E+01 Bala-140 <5.10E+01 O.OOE+OO 5.10E+01 Be-7 1.78E+03 3.95E+02 4.09E+02 K-40 2.44E+03 6.08E+02 5.74E+02 Sample ID: 470625 Sample Dates : 3/5/2018

3/5/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3 .57E+01 O.OOE+OO 3.57E+01 Co-58 <3.44E+01 0.00E+OO 3.44E+01 Fe-59 <7 .16E+01 O.OOE+OO 7.16E+01 Co-60 <3.88E+01 0.00E+OO 3.88E+01 Zn-65 <7.94E+01 O.OOE+OO 7.94E+01 Zr-95 <8.01E+01 O.OOE+OO 8.01 E+01 Nb-95 <4.02E+01 O.OOE+OO 4.02E+01 1-131 <4.18E+01 O.OOE+OO 4.18E+01 Cs-134 <4.36E+01 0.00E+OO 4.36E+01 Cs-137 <4 .28E+01 O.OOE+OO 4 .28E+01 Bala-140 <4.45E+01 0.00E+OO 4.45E+01 Be-7 1.29E+03 6.63E+02 3.52E+02 Report Generated@ 5/1/201911 :57:36 EnRad Laboratories Appendix E - Page 81 of 91 Duke Energy Annual Report - Appendix E (ED~ 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report- 2018 (Appendix E)

Media Type: VEGETATION Concentration *(Activity): pCi/kg wet Sample Point 077 [ INDICATOR - SW@ 1 miles]

Sample ID: 470625 Sample Dates: 3/5/2018 - 3/5/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA K-40 3.27E+03 5.91E+02 5.25E+02 Sample ID: 473003 Sample Dates: 4/2/2018 -4/2/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.70E+01 O.OOE+OO 2.70E+01 Co-58 <2.42E+01 O.OOE+OO 2.42E+01 Fe-59 <4.82E+01 O.OOE+OO 4.82E+01 Co-60 <2.62E+01 O.OOE+OO 2.62E+01 Zn-65 <4.98E+01 O.OOE+OO 4.98E+01 Zr-95 <3.98E+01 O.OOE+OO 3.98E+01 Nb-95 <2.67E+01 O.OOE+OO 2.67E+01 1-131 <1.91E+01 O.OOE+OO 1.91E+01 Cs-134 <2 .78E+01 O.OOE+OO 2.78E+01 Cs-137 <2.66E+01 O.OOE+OO 2.66E+01 BaLa-140 <1 .57E+01 O.OOE+OO 1.57E+01 Be-7 1.27E+03 2.66E+02 2.75E+02 K-40 2.37E+03 4.72E+02 3.51E+02 Sample ID: 474917 Sample Dates : 5/7/2018 -5n/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3 .62E+01 O.OOE+OO 3.62E+01 Co-58 <2 .87E+01 O.OOE+OO 2.87E+01 Fe-59 <4 .78E+01 O.OOE+OO 4.78E+01 Co-60 <3.82E+01 O.OOE+OO 3.82E+01 Zn-65 <6.35E+01 O.OOE+OO 6.35E+01 Zr-95 <5.69E+01 O.OOE+OO 5.69E+01 Nb-95 <2.47E+01 O.OOE+OO 2.47E+01 1-131 <2.93E+01 O.OOE+OO 2.93E+01 Cs-134 <3.32E+01 O.OOE+OO 3.32E+01 Cs-137 <2.54E+01 O.OOE+OO 2.54E+01 BaLa-140 <3.51E+01 O.OOE+OO 3.51E+01 Be-7 4.22E+o2

2.11E+02 2.95E+02 K-40 4.53E+03 7 .68E+02 3.80E+02 Sample ID: 477403 Sample Dates : 6/4/2018 - 6/4/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <1.98E+01 O.OOE+OO 1.98E+01 Co-58 <2.41E+01 O.OOE+OO 2.41 E+01 Fe-59 <5.56E+01 O.OOE+OO 5.56E+01 Co-60 <2.65E+01 O.OOE+OO 2.65E+01 Zn-65 <4.14E+01 O.OOE+OO 4.14E+01 Zr-95 <4.39E+01 O.OOE+OO 4.39E+01 Nb-95 <2.36E+01 O.OOE+OO 2.36E+01 1-131 <3.00E+01 O.OOE+OO 3.00E+01 Cs-134 <2.95E+01 O.OOE+OO 2.95E+01 Cs-137 <2.94E+01 O.OOE+OO 2.94E+01 BaLa-140 <3.36E+01 O.OOE+OO 3.36E+01 Be-7 1.26E+03 2.83E+02 2.55E+02 K-40 2.88E+03 6.07E+02 4.56E+02 Sample ID: 478995 Sample Dates: 7/2/2018 - 7/2/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2 .74E+01 O.OOE+OO 2.74E+01 Co-58 <2.90E+01 O.OOE+OO 2.90E+01 Fe-59 <5.65E+01 O.OOE+OO 5.65E+01 Co-60 <2.70E+01 O.OOE+OO 2.70E+01 Zn-65 <7.32E+01 O.OOE+OO 7.32E+01 Zr-95 <5.68E+01 O.OOE+OO 5.68E+01 Nb-95 <2.71E+01 O.OOE+OO 2.71 E+01 1-131 <3.56E+01 O.OOE+OO 3.56E+01 Cs-134 <3.65E+01 O.OOE+OO 3.65E+01 Cs- 137 <2.51E+01 O.OOE+OO 2.51E+01 BaLa-140 <3.86E+01 O.OOE+OO 3.86E+01 Be-7 1.82E+03 3.68E+02 3.16E+02 K-40 3.09E+03 6.28E+02 2.88E+02 Sample ID: 481986 Sample Dates : 8/6/2018 - 8/6/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.73E+01 O.OOE+OO 3.73E+01 Co-58 <3 .72E+01 0.00E+OO 3.72E+01 Fe-59 <5.73E+01 O.OOE+OO 5.73E+01 Co-60 <3.36E+01 O.OOE+OO 3.36E+01 Zn-65 <5.24E+01 O.OOE+OO 5.24E+01 Report Generated @ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 82 of 91 Duke Energy Annual Report -Appendix E

~En ~ 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report- 2018 (Appendix E)

Media Type: VEGETATION Concentration (Activity): pCi/kg wet Sample Point 077 [ INDICATOR - SW@ 1 miles]

Sample ID: 481986 Sample Dates: 8/6/2018 - 8/6/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Zr-95 <6.22E+01 O.OOE+OO 6.22E+01 Nb-95 <2.94E+01 O.OOE+OO 2.94E+01 1-131 <2.59E+01 O.OOE+OO 2.59E+01 Cs-134 <4.04E+01 O.OOE+OO 4.04E+01 Cs-137 <2.7SE+01 O.OOE+OO 2.7SE+01 BaLa-140 <4.04E+01 O.OOE+OO 4.04E+01 Be-7 1.4SE+03 3.40E+02 3.07E+02 K-40 4.07E+03 8.34E+02 6.66E+02 Sample ID: 483576 Sample Dates : 9/4/2018 - 9/4/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.71E+01 O.OOE+OO 2.71E+01 Co-58 <2.81E+01 O.OOE+OO 2.81 E+01 Fe-59 <5.95E+01 O.OOE+OO 5.95E+01 Co-60 <2.64E+01 O.OOE+OO 2.64E+01 Zn-65 <4.67E+01 O.OOE+OO 4.67E+01 Zr-95 <4.23E+01 O.OOE+OO 4.23E+01 Nb-95 <3.16E+01 O.OOE+OO 3.16E+01 1-131 <4 .80E+01 O.OOE+OO 4.80E+01 Cs-134 <3.49E+01 O.OOE+OO 3.49E+01 Cs-137 <2.71E+01 O.OOE+OO 2.71E+01 BaLa-140 <4.11E+01 O.OOE+OO 4.11E+01 Be-7 2.7SE+03 4 .00E+02 3.07E+02 K-40 4.27E+03 6.76E+02 5.64E+02 Sample ID: 486188 Sample Dates : 10/1/2018 - 10/1/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.9SE+01 O.OOE+OO 3.9SE+01 Co-58 <4 .19E+01 O.OOE+OO 4.19E+01 Fe-59 <8.25E+01 O.OOE+OO 8.25E+01 Co-60 <4.29E+01 O.OOE+OO 4 .29E+01 Zn-65 <7 .85E+01 O.OOE+OO 7.85E+01 Zr-95 <6.02E+01 O.OOE+OO 6.02E+01 Nb-95 <3.05E+01 O.OOE+OO 3.05E+01 1-131 <4.49E+01 0.00E+OO 4.49E+01 Cs-134 <4.12E+01 O.OOE+OO 4 .12E+01 Cs-137 <4.20E+01 O.OOE+OO 4 .20E+01 BaLa-140 <3.3SE+01 O.OOE+OO 3.38E+01 Be-7 1.30E+03 4.16E+02 5.56E+02 K-40 3.22E+03 6.9SE+02 5.45E+02 Sample ID: 488874 Sample Dates : 11/5/2018 -11/5/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 < 1.42E+01 O.OOE+OO 1.42E+01 Co-58 < 1.62E+01 O.OOE+OO 1.62E+01 Fe-59 <3.16E+01 0.00E+OO 3.16E+01 Co-60 < 1.03E+01 O.OOE+OO 1.03E+01 Zn-65 <3.11E+01 O.OOE+OO 3.11E+01 Zr-95 <3.2SE+01 O.OOE+OO 3.2SE+01 Nb-95 < 1.63E+01 O.OOE+OO 1.63E+01 1-131 <4.32E+01 O.OOE+OO 4 .32E+01 Cs-134 <2.32E+01 O.OOE+OO 2.32E+01 Cs- 137 <1 .73E+01 O.OOE+OO 1.73E+01 BaLa-140 <3 .13E+01 O.OOE+OO 3.13E+01 Be-7 1.50E+03 2.50E+02 2.37E+02 K-40 3.58E+03 4.67E+02 2.09E+02 Sample ID: 490823 Sample Dates: 12/3/2018 - 12/3/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.99E+01 O.OOE+OO 2.99E+01 Co-58 <2.74E+01 O.OOE+OO 2.74E+01 Fe-59 <5.53E+0 1 O.OOE+OO 5.53E+01 Co-60 <2.96E+01 O.OOE+OO 2.96E+01 Zn-65 <6.15E+01 O.OOE+OO 6.15E+01 Zr-95 <4.47E+01 O.OOE+OO 4.47E+01 Nb-95 <2.75E+01 O.OOE+OO 2.75E+01 1-131 <3.86E+01 O.OOE+OO 3.86E+01 Cs-134 <3 .51E+01 O.OOE+OO 3.51 E+01 Cs-137 <2.6SE+01 O.OOE+OO 2.68E+01 BaLa-140 <4 .83E+01 O.OOE+OO 4.83E+01 Be-7 1.84E+03 3.15E+02 3.24E+02 K-40 2.39E+03 4 .73E+02 4 .90E+02 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 83 of 91 Duke Energy Annual Report - Appendix E <ij~ 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report- 2018 (Appendix E)

Media Type: VEGETATION Concentration (Activity): pCi/kg wet Sample Point 079 [ INDICATOR - NE @ 0.56 miles ]

Sample ID: 466020 Sample Dates: 1/2/2018 -1/2/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.65E+01 O.OOE+OO 2.65E+01 Co-58 <2.31E+01 O.OOE+OO 2.31E+01 Fe-59 <4.88E+01 O.OOE+OO 4.88E+01 Co-60 <2.67E+01 O.OOE+OO 2.67E+01 Zn-65 <5.14E+01 O.OOE+OO 5.14E+01 Zr-95 <5.10E+01 O.OOE+OO 5.10E+01 Nb-95 <2.92E+01 O.OOE+OO 2.92E+01 1-131 <4.63E+01 O.OOE+OO 4.63E+01 Cs-134 <3.14E+01 O.OOE+OO 3.14E+01 Cs- 137 <3.22E+01 O.OOE+OO 3.22E+01 Bala-140 <4.15E+01 O.OOE+OO 4.1 5E+01 Be-7 2.79E+03 3.92E+02 3.84E+02 K-40 6.54E+03 7.77E+02 4.54E+02 Sample ID: 467681 Sample Dates : 2/5/2018 - 2/5/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.59E+01 O.OOE+OO 2.59E+01 Co-58 <2.57E+01 O.OOE+OO 2.57E+01 Fe-59 <6.04E+01 O.OOE+OO 6.04E+01 Co-60 <2.57E+01 O.OOE+OO 2.57E+01 Zn-65 <6.31E+01 O.OOE+OO 6.31E+01 Zr-95 <4.03E+01 O.OOE+OO 4.03E+01 Nb-95 <2.86E+01 O.OOE+OO 2.86E+01 1-131 <4.79E+01 O.OOE+OO 4.79E+01 Cs-134 <3.34E+01 O.OOE+OO 3.34E+01 Cs-137 <2.59E+01 O.OOE+OO 2.59E+01 Bala-140 <3.49E+01 O.OOE+OO 3.49E+01 Be-7 1.68E+03 3.33E+02 2.81E+02 K-40 2.40E+03 4.92E+02 5.81E+01 Sample ID: 470626 Sample Dates: 3/5/2018 - 3/5/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.90E+01 O.OOE+OO 3.90E+01 Co-58 <4.07E+01 O.OOE+OO 4.07E+01 Fe-59 <7.64E+01 O.OOE+OO 7 .64E+01 Co-60 <3.57E+01 O.OOE+OO 3.57E+01 Zn-65 <8 .57E+01 O.OOE+OO 8.57E+01 Zr-95 <7 .04E+01 O.OOE+OO 7 .04E+01 Nb-95 <3.83E+01 O.OOE+OO 3.83E+01 1-131 <4 .23E+01 O.OOE+OO 4 .23E+01 Cs-134 <4 .75E+01 O.OOE+OO 4 .75E+01 Cs-137 <4.05E+01 O.OOE+OO 4.05E+01 Bala-140 <4.83E+01 O.OOE+OO 4.83E+01 Be-7 1.60E+03 3.96E+02 5.06E+02 K- 40 3.57E+0 3 7 .73E+02 8.59E+02 Sample ID: 473004 Sample Dates: 4/2/2018 - 4/2/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.32E+01 O.OOE+OO 3.32E+01 Co-58 <3.46E+01 O.OOE+OO 3.46E+01 Fe-59 <6.82E+01 O.OOE+OO 6.82E+01 Co-60 <3.79E+01 O.OOE+OO 3.79E+01 Zn-65 <8.01E+01 O.OOE+OO 8.01E+01 Zr-95 <5.17E+01 O.OOE+OO 5.17E+01 Nb-95 <4. 01E+01 0.00E+OO 4.01E+01 1-131 <3.10E+01 O.OOE+OO 3.10E+01 Cs-134 <3.15E+01 O.OOE+OO 3.15E+01 Cs-137 <4.22E+01 O.OOE+OO 4 .22E+01 Bala-140 <3.61E+01 O.OOE+OO 3.61 E+01 Be-7 1.98E+03 4.07E+02 3.53E+02 K-40 3.46E+03 7.28E+02 4 .56E+02 Sample ID: 474918 Sample Dates: 517/2018

5/7/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.21E+01 O.OOE+OO 3.21E+01 Co-58 <3.23E+01 O.OOE+OO 3.23E+01 Fe-59 <8.11E+01 O.OOE+OO 8.11E+01 Co-60 <3.69E+01 O.OOE+OO 3.69E+01 Zn-65 <6.92E+01 O.OOE+OO 6.92E+01 Zr-95 <6.97E+01 O.OOE+OO 6.97E+01 Nb-95 <3.94E+01 O.OOE+OO 3.94E+01 1-131 <3.76E+01 O.OOE+OO 3.76E+01 Report Generated@ 5/1/2019 11 :57:36 Duke Energy Annual Report - Appendix E (lg~

--...... EnRad Laboratories 13339 Hagers Ferry Road Appendix E - Page 84 of 91 Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: VEGETATION Concentration (Activity): pCi/kg wet Sample Point 079 [ INDICATOR - NE@ 0.56 miles]

Sample ID: 474918 Sample Dates: Sn/2018

Sn/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Cs-134 <3.92E+01 O.OOE+OO 3.92E+01 Cs-137 <4.0BE+01 O.OOE+OO 4.0BE+01 Bala-140 <4.30E+01 O.OOE+OO 4.30E+01 Be-7 2.04E+03 4.19E+02 3.79E+02 K-40 6.12E+03 1.00E+03 4.81E+02 Sample ID: 477404 Sample Dates: 6/4/2018 - 6/4/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.94E+01 O.OOE+OO 2.94E+01 Co-58 <2.47E+01 O.OOE+OO 2.47E+01 Fe-59 <S.19E+01 0.00E+OO 5.19E+01 Co-60 <2.9SE+01 O.OOE+OO 2.9SE+01 Zn-65 <5.66E+01 O.OOE+OO 5.66E+01 Zr-95 <4.83E+01 O.OOE+OO 4.83E+01 Nb-95 <2.90E+01 O.OOE+OO 2.90E+01 1-131 <3.76E+01 O.OOE+OO 3.76E+01 Cs-134 <3.73E+01 O.OOE+OO 3.73E+01 Cs-137 <2.82E+01 0.00E+OO 2.82E+01 Bala-140 <3.70E+01 O.OOE+OO 3.70E+01 Be-7 2.06E+03 5.93E+02 3.06E+02 K-40 S.81E+03 1.24E+03 2.53E+02 Sample ID: 478996 Sample Dates: 7/2/2018 - 7/2/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.12E+01 O.OOE+OO 3.12E+01 Co-SB <3.13E+01 O.OOE+OO 3.13E+01 Fe-59 <5.45E+01 O.OOE+OO S.45E+01 Co-60 <3.41 E+01 O.OOE+OO 3.41E+01 Zn-65 <8.29E+01 O.OOE+OO 8.29E+01 Zr-95 <6.67E+01 O.OOE+OO 6.67E+01 Nb-95 <3 .38E+01 O.OOE+OO 3.38E+01 1-131 . <3 .72E+01 0.00E+OO 3.72E+01 Cs-134 <4.42E+01 O.OOE+OO 4.42E+01 Cs-137 <3.16E+01 O.OOE+OO 3.16E+01 Bala-140 <3.76E+01 O.OOE+OO 3.76E+01 Be-7 1.98E+03 4 .29E+02 4.21E+02 K-40 4.97E+03 8.77E+02 4.22E+02 Sample ID: 481987 Sample Dates: 8/6/2018 - 8/6/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <4.10E+01 0.00E+OO 4.10E+01 Co-58 <3.09E+01 O.OOE+OO 3.09E+01 Fe-59 <6.34E+01 O.OOE+OO 6.34E+01 Co-60 <4 .51E+01 O.OOE+OO 4.51 E+01 Zn-65 <9.24E+01 0.00E+OO 9.24E+01 Zr-95 <B.98E+01 O.OOE+OO B.98E+01 Nb-95 <4.17E+01 O.OOE+OO 4.17E+01 1-131 <3.89E+01 O.OOE+OO 3.89E+01 Cs-134 <4.60E+01 0.00E+OO 4.60E+01 Cs-137 <3.97E+01 O.OOE+OO 3.97E+01 Bala-140 <1.36E+01 O.OOE+OO 1.36E+01 Be-7 3.43E+03 4 .99E+02 3.B7E+02 K-40 3.93E+0 3 9.00E+02 6.78E+02 Sample ID: 483577 Sample Dates : 9/4/2018 -9/4/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2 .35E+01 O.OOE+OO 2.35E+01 Co-58 <2 .28E+01 O.OOE+OO 2.28E+01 Fe-59 <4.03E+01 O.OOE+OO 4.03E+01 Co-60 <2.07E+01 O.OOE+OO 2.07E+01 Zn-65 <4.92E+01 O.OOE+OO 4.92E+01 Zr-95 <4.39E+01 O.OOE+OO 4.39E+01 Nb-95 <2.65E+01 O.OOE+OO 2.65E+01 1-131 <3.57E+01 0.00E+OO 3.57E+01 Cs-134 <2.69E+01 O.OOE+OO 2.69E+01 Cs-137 <2 .00E+01 O.OOE+OO 2.00E+01 Bala-140 <3.13E+01 O.OOE+OO 3.13E+01 Be-7 1.56E+03 2.79E+02 2.79E+02 K-40 4.45E+03 6.1BE+02 3.53E+02 Sample ID: 486189 Sample Dates: 10/1/2018 -10/1/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.52E+01 O.OOE+OO 2.52E+01 EnRad Laboratories Report Generated@ 5/1/2019 11 :57:36 Duke Energy Annual Report - Appendix E /fu =:> 13339 Hagers Ferry Road Huntersville. North Carolina 28078 Appendix E - Page 85 of 91

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: VEGETATION Concentration (Activity): pCi/kgwet Sample Point 079 [ INDICATOR - NE @ 0.56 miles ]

Sample ID: 486189 Sample Dates: 10/1/2018 -10/1/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Co-58 <2.65E+01 0.00E+OO 2.65E+01 Fe-59 <4.70E+01 O.OOE+OO 4.70E+01 Co-60 <2.71E+01 0.00E+OO 2.71E+01 Zn-65 <5.54E+01 O.OOE+OO 5.54E+01 Zr-95 <4 .98E+01 O.OOE+OO 4.98E+01 Nb-95 <2.48E+01 O.OOE+OO 2.48E+01 1-131 <2.28E+01 O.OOE+OO 2.28E+01 Cs-134 <3.32E+01 O.OOE+OO 3.32E+01 Cs-137 <2.49E+01 O.OOE+OO 2.49E+01 BaLa-140 <3.25E+01 O.OOE+OO 3.25E+01 Be-7 1.37E+03 2.91E+02 3.13E+02 K-40 4.51E+03 7.05E+02 4.93E+02 Sample ID: 488875 Sample Dates: 11/5/2018 -11/5/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.00E+01 0.00E+OO 2.00E+01 Co-58 <1.93E+01 O.OOE+OO 1.93E+01 Fe-59 <4.37E+01 0.00E+OO 4.37E+01 Co-60 <2.14E+01 O.OOE+OO 2.14E+01 Zn-65 <3.44E+01 O.OOE+OO 3.44E+01 Zr-95 <2 .87E+01 O.OOE+OO 2.87E+01 Nb-95 <2.11E+01 O.OOE+OO 2.11E+01 1-131 <4.79E+01 0.00E+OO 4.79E+01 Cs-134 <2.21E+01 O.OOE+OO 2.21E+01 Cs-137 <1.67E+01 O.OOE+OO 1.67E+01 BaLa-140 <4.02E+01 O.OOE+OO 4.02E+01 Be-7 2.21E+03 3.22E+02 2.62E+02 K-40 4.76E+03 5.90E+02 2.62E+02 Sample ID: 490824 Sample Dates: 12/3/2018 -12/3/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.26E+01 O.OOE+OO 2.26E+01 Co-58 <1.96E+01 0.00E+OO 1.96E+01 Fe-59 <4 .88E+01 O.OOE+OO 4.BBE+01 Co-60 <2. 09E+01 O.OOE+OO 2.09E+01 Zn-65 <4.57E+01 O.OOE+OO 4.57E+01 Zr-95 <3.36E+01 0.00E+OO 3.36E+01 Nb-95 <2.18E+01 O.OOE+OO 2.18E+01 1-131 <3.45E+01 0.00E+OO 3.45E+01 Cs-134 <2.35E+01 O.OOE+OO 2.35E+01 Cs-137 <1.97E+01 0.00E+OO 1.97E+01 BaLa-140 <2.74E+01 O.OOE+OO 2.74E+01 Be-7 1.99E+03 3.04E+02 2.85E+02 K-40 4.58E+03 5.83E+02 2.96E+02 Sample Point 081 [ CONTROL - SE@ 9.33 miles]

Sample ID: 466021 Sample Dates : 1/2/2018 -1/2/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.4BE+01 O.OOE+OO 2.4BE+01 Co-58 <2.50E+01 O.OOE+OO 2.50E+01 Fe-59 <4.50E+01 0.00E+OO 4.50E+01 Co-60 <2.11E+01 O.OOE+OO 2.11E+01 Zn-65 <5.36E+01 O.OOE+OO 5.36E+01 Zr-95 <5.03E+01 O.OOE+OO 5.03E+01 Nb-95 <2.78E+01 0.00E+OO 2.78E+01 1-131 <4.79E+01 O.OOE+OO 4.79E+01 Cs-134 <3.12E+01 O.OOE+OO 3.12E+01 Cs-137 <2.6BE+01 O.OOE+OO 2.6BE+01 BaLa-140 <4.20E+01 0.00E+OO 4.20E+01 Be-7 1.32E+03 4.28E+02 2.70E+02 K-40 4.73E+03 6.0BE+02 4 .07E+02 Sample ID: 467682 Sample Dates: 2/5/2018 -2/5/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.71E+01 O.OOE+OO 2.71E+01 Co-58 <3.29E+01 O.OOE+OO 3.29E+01 Fe-59 <3.69E+01 0.00E+OO 3.69E+01 Co-60 <2 .81E+01 O.OOE+OO 2.81E+01 Zn-65 <6.57E+01 0.00E+OO 6.57E+01 Zr-95 <6.27E+01 O.OOE+OO 6.27E+01 Nb-95 <3.47E+01 0.00E+OO 3.47E+01 EnRad Laboratories cEn~

Report Generated @ 5/1/2019 11 :57:36 Appendix E - Page 86 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: VEGETATION Concentration (Activity): pCi/kg wet Sample Point 081 [ CONTROL - SE @ 9.33 miles]

Sample ID: 467682 Sample Dates : 2/5/2018

2/5/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA 1-131 <4.62E+01 0.00E+OO 4.62E+01 Cs- 134 <2.73E+01 O.OOE+OO 2.73E+01 Cs-137 <2.72E+01 0.00E+OO 2.72E+01 Bala- 140 <4.96E+01 O.OOE+OO 4.96E+01 Be-7 1.35E+03 3.25E+02 3.31E+02 K-40 2.57E+03 5.48E+02 2.82E+02 Sample ID: 470627 Sample Dates: 3/5/2018 - 3/5/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.64E+01 0.00E+OO 2.64E+01 Co-58 <3.85E+01 O.OOE+OO 3.85E+01 Fe-59 <5.41E+01 O.OOE+OO 5.41E+01 Co-60 <3.08E+01 O.OOE+OO 3.08E+01 Zn-65 <6.42E+01 O.OOE+OO 6.42E+01 Zr-95 <4.74E+01 O.OOE+OO 4.74E+01 Nb-95 <3.08E+01 O.OOE+OO 3.08E+01 1-131 <2.84E+01 0.00E+OO 2.84E+01 Cs-134 <3.82E+01 O.OOE+OO 3.82E+01 Cs-137 <2.85E+01 0.00E+OO 2.85E+01 Bala- 140 <3.92E+01 O.OOE+OO 3.92E+01 Be-7 2.07E+03 3.45E+02 3.64E+02 K-40 3.42E+03 3.37E+02 3.60E+02 Sample ID: 473005 Sample Dates: 4/2/2018 - 4/2/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.49E+01 O.OOE+OO 3.49E+01 Co-58 <2.89E+01 O.OOE+OO 2.89E+01 Fe-59 <5.78E+01 O.OOE+OO 5.78E+01 Co-60 <6.28E+OO O.OOE+OO 6.28E+OO Zn-65 <6.41E+01 O.OOE+OO 6.41 E+01 Zr-95 <4 .59E+01 0.00E+OO 4.59E+01 Nb-95 <2.81E+01 O.OOE+OO 2.81 E+01 1-131 <2.96E+01 0.00E+OO 2.96E+01 Cs-134 <4.20E+01 O.OOE+OO 4.20E+01 Cs-137 <3.29E+01 O.OOE+OO 3.29E+01 Bala-140 <2. 92E+01 O.OOE+OO 2.92E+01 Be-7 1.99E+03 4.03E+02 4.04E+02 K-40 3.14E+03 6.13E+02 2.91 E+02 Sample ID: 474919 Sample Dates : 5/7/2018 - 5/7/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.15E+01 0.00E+OO 2.15E+01 Co-58 <2 .75E+01 O.OOE+OO 2.75E+01 Fe-59 <7 .14E+01 0.00E+OO 7.14E+01 Co-60 <4 .31 E+01 O.OOE+OO 4.31E+01 Zn-65 <5.45E+01 O.OOE+OO 5.45E+01 Zr-95 <4 .98E+01 O.OOE+OO 4 .98E+01 Nb-95 <2.70E+01 O.OOE+OO 2.70E+01 1-131 <3.36E+01 O.OOE+OO 3.36E+01 Cs-134 <2.41E+01 0.00E+OO 2.41 E+01 Cs- 137 <3.55E+01 0.00E+OO 3.55E+01 Bala- 140 <4 .07E+01 O.OOE+OO 4.07E+01 Be-7 <2.86E+02 O.OOE+OO 2.86E+02 K-40 4.21E+03 7.54E+02 4 .54E+02 Sample ID: 477405 Sample Dates: 6/4/2018. 6/4/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.06E+01 O.OOE+OO 3.06E+01 Co-58 <2.22E+01 O.OOE+OO 2.22E+01 Fe-59 <6.79E+01 O.OOE+OO 6.79E+01 Co-60 <2.27E+01 O.OOE+OO 2.27E+01 Zn-65 <5.14E+01 0.00E+OO 5.14E+01 Zr-95 <4.42E+01 O.OOE+OO 4.42E+01 Nb-95 <2.35E+01 O.OOE+OO 2.35E+01 1-131 <3 .12E+01 O.OOE+OO 3.12E+01 Cs-134 <2.84E+01 O.OOE+OO 2.84E+01 Cs- 137 <2.72E+01 O.OOE+OO 2.72E+01 Bala-140 <4.55E+01 O.OOE+OO 4 .55E+01 Be-7 1.46E+03 3.25E+02 3.02E+02 K-40 3.80E+03 7.12E+02 4.03E+02 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 87 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: VEGETATION Concentration (Activity): pCi/kg wet Sample Point 081 [ CONTROL - SE @ 9.33 miles J Sample ID: 478997 Sample Dates : 7/2/2018 - 7/2/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.92E+01 O.OOE+OO 3.92E+01 Co-58 <2.96E+01 O.OOE+OO 2.96E+01 Fe-59 <7 .24E+01 O.OOE+OO 7.24E+01 Co-60 <3.96E+01 O.OOE+OO 3.96E+01 Zn-65 <6.93E+01 O.OOE+OO 6.93E+01 Zr-95 <4.37E+01 O.OOE+OO 4.37E+01 Nb-95 <2.91E+01 O.OOE+OO 2.91E+01 1-131 <3.3SE+01 O.OOE+OO 3.3SE+01 Cs-134 <3.29E+01 O.OOE+OO 3.29E+01 Cs-137 <2.S4E+01 O.OOE+OO 2.S4E+01 BaLa-140 <4 .67E+01 O.OOE+OO 4.67E+01 Be-7 1.53E+03 3.67E+02 3.42E+02 K-40 4.05E+0 3 8.34E+02 6.00E+02 Sample ID: 481988 Sample Dates: 8/6/2018 - 8/6/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.06E+01 O.OOE+OO 3.06E+01 Co-58 <3.33E+01 O.OOE+OO 3.33E+01 Fe-59 <5.40E+01 O.OOE+OO 5.40E+01 Co-60 <3.21E+01 O.OOE+OO 3.21E+01 Zn-65 <5.93E+01 O.OOE+OO 5.93E+01 Zr-95 <5.77E+01 O.OOE+OO 5.77E+01 Nb-95 <3.34E+01 O.OOE+OO 3.34E+01 1-131 <3.40E+01 O.OOE+OO 3.40E+01 Cs-134 <3.62E+01 O.OOE+OO 3.62E+01 Cs-137 <3.35E+01 O.OOE+OO 3.35E+01 BaLa-140 <3.24E+01 O.OOE+OO 3.24E+01 Be-7 1.27E+03 3.39E+02 4 .1 2E+02 K-40 4.65E+03 7 .75E+02 4.76E+02 Sample ID: 483578 Sample Dates: 9/4/2018 - 9/4/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <4.24E+01 O.OOE+OO 4 .24E+01 Co-58 <3.S5E+01 O.OOE+OO 3.S5E+01 Fe-59 <7.27E+01 O.OOE+OO 7.27E+01 Co-60 <4 .22E+01 O.OOE+OO 4 .22E+01 Zn-65 <8.67E+01 O.OOE+OO 8.67E+01 Zr-95 <7.02E+01 O.OOE+OO 7.02E+01 Nb-95 <3.34E+01 O.OOE+OO 3.34E+01 1-131 <3.99E+01 O.OOE+OO 3.99E+01 Cs-134 <4.55E+01 O.OOE+OO 4.55E+01 Cs-137 <3.74E+01 O.OOE+OO 3.74E+01 BaLa-140 <5.71E+01 O.OOE+OO 5.71E+01 Be-7 1.8SE+03 4 .21E+02 3.47E+02 K-40 3.36E+03 7.53E+02 3.35E+02 Sample ID: 486190 Sample Dates: 10/1/2018 - 10/1/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.79E+01 O.OOE+OO 2.79E+01 Co-58 <3.70E+01 O.OOE+OO 3.70E+01 Fe-59 <6.39E+01 O.OOE+OO 6.39E+01 Co-60 <4.36E+01 O.OOE+OO 4 .36E+01 Zn-65 <3.97E+01 O.OOE+OO 3.97E+01 Zr-95 <3.42E+01 O.OOE+OO 3.42E+01 Nb-95 <3.90E+01 O.OOE+OO 3.90E+01 1-131 <3.76E+01 O.OOE+OO 3.76E+01 Cs-134 <3.79E+01 O.OOE+OO 3.79E+01 Cs-137 <2 .70E+01 O.OOE+OO 2.70E+01 BaLa-140 <5.06E+01 O.OOE+OO 5.06E+01 Be-7 1.74E+03 4.35E+02 4.S2E+02 K- 40 5.11E+03 9.7SE+02 7 .0SE+02 Sample ID: 488876 sa*mple Dates: 11/5/2018 -11/5/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 < 1.37E+01 O.OOE+OO 1.37E+01 Co-58 < 1.57E+01 O.OOE+OO 1.57E+01 Fe-59 <3.00E+01 O.OOE+OO 3.00E+01 Co-60 <1 .62E+01 O.OOE+OO 1.62E+01 Zn-65 <3.09E+01 O.OOE+OO 3.09E+01 Zr-95 <2 .55E+01 O.OOE+OO 2.55E+01 Nb-95 <1 .71E+01 O.OOE+OO 1.71 E+01 1- 131 <4.53E+01 O.OOE+OO 4.53E+01

-- -..... EnRad Laboratories Report Generated@ 5/1/2019 11:57:36 Duke Energy Annual Report -Appendix E r*En _) 13339 Hagers Ferry Road Appendix E - Page 88 of 91 Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: VEGETATION Concentration (Activity): pCi/kg wet Sample Point 081 [ CONTROL - SE @ 9.33 miles ]

Sample ID: 488876 Sample Dates: 11/5/2018 -11/5/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Cs-134 <1.92E+01 O.OOE+OO 1.92E+01 Cs-137 <1.56E+01 O.OOE+OO 1.56E+01 BaLa-140 <3.23E+01 O.OOE+OO 3.23E+01 Be-7 1.00E+03 1.75E+02 1.81E+02 K-40 2.88E+03 3.78E+02 2.71 E+02 Sample ID: 490825 Sample Dates: 12/3/2018 -12/3/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.41E+01 O.OOE+OO 3.41 E+01 Co-58 <3.27E+01 O.OOE+OO 3.27E+01 Fe-59 <6 .72E+01 0.00E+OO 6.72E+01 Co-60 <2.62E+01 O.OOE+OO 2.62E+01 Zn-65 <8.22E+01 O.OOE+OO 8.22E+01 Zr-95 <5.53E+01 O.OOE+OO 5.53E+01 Nb-95 <3.35E+01 O.OOE+OO 3.35E+01 1-131 <4.77E+01 O.OOE+OO 4.77E+01 Cs-134 <4.07E+01 O.OOE+OO 4.07E+01 Cs-137 <2.54E+01 0.00E+OO 2.54E+01 BaLa-140 <4.64E+01 O.OOE+OO 4.64E+01 Be-7 2.56E+03 4.39E+02 3.50E+02 K-40 4.05E+03 7.01E+02 3.59E+02 Sample Point 084 [ INDICATOR - NNE @ 2.58 miles ]

Sample ID: 466022 Sample Dates: 1/2/2018 -1/2/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3 .03E+01 O.OOE+OO 3.03E+01 Co-58 <2.86E+01 O.OOE+OO 2.86E+01 Fe-59 <5.34E+01 O.OOE+OO 5.34E+01 Co-60 <2.89E+01 O.OOE+OO 2.89E+01 Zn-65 <6.09E+01 O.OOE+OO 6.09E+01 Zr-95 <5.81E+01 0.00E+OO 5.81 E+01 Nb-95 <3.11 E+01 O.OOE+OO 3.11 E+01 1-131 <4.20E+01 0.00E+OO 4.20E+01 Cs-134 <2.88E+01 0.00E+OO 2.88E+01 Cs-137 <2.85E+01 O.OOE+OO 2.85E+01 BaLa-140 <4.77E+01 O.OOE+OO 4.77E+01 Be-7 3.91E+03 5.06E+02 3.72E+02 K-40 4.46E+03 6.59E+02 4.13E+02 Sample ID: 467683 Sample Dates: 2/5/2018 - 2/5/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.27E+01 O.OOE+OO 2.27E+01 Co-58 <2.44E+01 0.00E+OO 2.44E+01 Fe-59 <3 .86E+01 O.OOE+OO 3.86E+01 Co-60 <2.09E+01 0.00E+OO 2.09E+01 Zn-65 <4.88E+01 O.OOE+OO 4.88E+01 Zr-95 <2.86E+01 O.OOE+OO 2.86E+01 Nb-95 <2.13E+01 O.OOE+OO 2.13E+01 1-131 <3.26E+01 O.OOE+OO 3.26E+01 Cs-134 <1 .90E+01 O.OOE+OO 1.90E+01 Cs-137 <2.18E+01 O.OOE+OO 2.18E+01 BaLa-140 <8.29E+OO O.OOE+OO 8.29E+OO Be-7 3.72E+03 4 .87E+02 2.10E+02 K-40 2.61E+03 4.78E+02 4.72E+01 Sample ID: 470628 Sample Dates : 3/5/2018 - 3/5/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.28E+01 O.OOE+OO 3.28E+01 Co-58 <3.41E+01 O.OOE+OO 3.41E+01 Fe-59 <7.92E+01 O.OOE+OO 7.92E+01 Co-60 <3.67E+01 0.00E+OO 3.67E+01 Zn-65 <7.79E+01 O.OOE+OO 7.79E+01 Zr-95 <6.28E+01 0.00E+OO 6.28E+01 Nb-95 <4.16E+01 O.OOE+OO 4.16E+01 1-131 <3.82E+01 O.OOE+OO 3.82E+01 Cs-134 <4.62E+01 O.OOE+OO 4.62E+01 Cs- 137 <3.57E+01 O.OOE+OO 3.57E+01 BaLa-140 <2.80E+01 O.OOE+OO 2.80E+01 Be-7 6.21E+03 7.46E+02 4.84E+02 K-40 4.46E+03 7.72E+02 6.44E+02 Report Generated@ 5/1/2019 11:57:36 EnRad Laboratories Appendix E - Page 89 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: VEGETATION Concentration (Activity): pCi/kg wet Sample Point 084 [ INDICATOR

NNE @ 2.58 miles]

Sample ID: 473006 Sample Dates: 4/2/2018

4/2/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <1.57E+01 O.OOE+OO 1.57E+01 Co-58 <1 .51E+01 O.OOE+OO 1.51E+01 Fe-59 <3 .41E+01 O.OOE+OO 3.41E+01 Co-60 <1 .58E+01 O.OOE+OO 1.58E+01 Zn-65 <3.93E+01 O.OOE+OO 3.93E+01 Zr-95 <2.51E+01 O.OOE+OO 2.51E+01 Nb-95 <1.94E+01 O.OOE+OO 1.94E+01 1-131 <4.75E+01 O.OOE+OO 4.75E+01 Cs-134 <1.85E+01 O.OOE+OO 1.85E+01 Cs-137 <1.50E+01 O.OOE+OO 1.50E+01 Bala-140 <3.73E+01 O.OOE+OO 3.73E+01 Be-7 4.59E+03 5.03E+02 1.97E+02 K-40 4.21E+03 5.36E+02 2.49E+02 Sample ID: 474920 Sample Dates: 517/2018 -517/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.21E+01 O.OOE+OO 2.21E+01 Co-58 <2.23E+01 O.OOE+OO 2.23E+01 Fe-59 <5.12E+01 O.OOE+OO 5.12E+01 Co-60 <2.73E+01 O.OOE+OO 2.73E+01 Zn-65 <6.64E+01 O.OOE+OO 6.64E+01 Zr-95 <3.59E+01 O.OOE+OO 3.59E+01 Nb-95 <2.92E+01 O.OOE+OO 2.92E+01 1- 131 <3 .25E+01 O.OOE+OO 3.25E+01 Cs-134 <3 .85E+01 O.OOE+OO 3.85E+01 Cs-137 <1 .82E+01 O.OOE+OO 1.82E+01 Bala-140 <2.38E+01 O.OOE+OO 2.38E+01 Be-7 2.93E+02 2.22E+02 3.44E+02 K-40 3.65E+03 6.90E+02 4.33E+02 Sample ID: 477406 Sample Dates : 6/4/2018 - 6/4/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.50E+01 O.OOE+OO 3.50E+01 Co-58 <2.91E+01 O.OOE+OO 2.91E+01 Fe-59 <7.44E+01 O.OOE+OO 7.44E+01 Co-60 <4.21E+01 O.OOE+OO 4.21 E+01 Zn-65 <5.28E+01 O.OOE+OO 5.28E+01 Zr-95 <5.61E+01 O.OOE+OO 5.61E+01 Nb-95 <3.71E+01 O.OOE+OO 3.71E+01 1-131 <3.66E+01 O.OOE+OO 3.66E+01 Cs-134 <4.61E+01 O.OOE+OO 4 .61 E+01 Cs-137 <2.80E+01 O.OOE+OO 2.80E+01 Bala-140 <5 .62E+01 O.OOE+OO 5.62E+01 Be-7 1.98E+03 4.18E+02 3.91 E+02 K-40 4 .65E+03 8.69E+02 5.69E+02 Sample ID: 478998 Sample Dates : 7/2/2018 - 7/2/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.97E+01 O.OOE+OO 2.97E+01 Co-58 <2.99E+01 O.OOE+OO 2.99E+01 Fe-59 <7.24E+01 O.OOE+OO 7.24E+01 Co-60 <3.43E+01 O.OOE+OO 3.43E+01 Zn-65 <6.56E+01 O.OOE+OO 6.56E+01 Zr-95 <5.76E+01 O.OOE+OO 5.76E+01 Nb-95 <3.94E+01 O.OOE+OO 3.94E+01 1-131 <3.19E+01 O.OOE+OO 3.19E+01 Cs-134 <4.17E+01 O.OOE+OO 4.17E+01 Cs-137 <2.30E+01 O.OOE+OO 2.30E+01 Bala-140 <2.99E+01 O.OOE+OO 2.99E+01 Be-7 1. 11E+03 3.17E+02 3.44E+02 K-40 2.94E+03 6.26E+02 7 .74E+01 Sample ID: 481989 Sample Dates : 8/6/2018 -8/6/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.83E+01 O.OOE+OO 3.83E+01 Co-58 <3.45E+01 O.OOE+OO 3.45E+01 Fe-59 <7.38E+01 O.OOE+OO 7 .38E+01 Co-60 <3.58E+01 O.OOE+OO 3.58E+01 Zn-65 <9.70E+01 O.OOE+OO 9.70E+01 Zr-95 <7.22E+01 O.OOE+OO 7 .22E+01 Nb-95 <3.72E+01 O.OOE+OO 3.72E+01 1-131 <3.61E+01 O.OOE+OO 3.61E+01 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 90 of 91 Duke Energy Annual Report - Appendix E CEn~ 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2018 (Appendix E)

Media Type: VEGETATION Concentration (Activity): pCi/kgwet Sample Point 084 [ INDICATOR

NNE @ 2.58 miles]

Sample ID: 481989 Sample Dates: 8/6/2018 - 8/6/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Cs-134 <4.50E+01 O.OOE+OO 4.50E+01 Cs-137 <3.72E+01 O.OOE+OO 3.72E+01 BaLa-140 <4.81E+01 O.OOE+OO 4.81E+01 Be-7 2.75E+03 5.28E+02 4.45E+02 K-40 3.75E+03 7.96E+02 4.30E+02 Sample ID: 483579 Sample Dates : 9/4/2018 - 9/4/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.46E+01 O.OOE+OO 2.46E+01 Co-58 <3 .03E+01 O.OOE+OO 3.03E+01 Fe-59 <5.60E+01 O.OOE+OO 5.60E+01 Co-60 <3.03E+01 O.OOE+OO 3.03E+01 Zn-65 <7.68E+01 O.OOE+OO 7.68E+01 Zr-95 <4.53E+01 O.OOE+OO 4.53E+01 Nb-95 <2.22E+01 O.OOE+OO 2.22E+01 1-131 <2.97E+01 O.OOE+OO 2.97E+01 Cs-134 <3.81E+01 O.OOE+OO 3.81E+01 Cs-137 <4.14E+01 O.OOE+OO 4 .14E+01 BaLa-140 <4.48E+01 O.OOE+OO 4.48E+01 Be-7 9.42E+02 2.71E+02 2.94E+02 K-40 2.46E+03 5.73E+02 3.98E+02 Sample ID: 486191 Sample Dates: 10/1/2018 -10/1/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.52E+01 O.OOE+OO 2.52E+01 Co-58 <1.62E+01 O.OOE+OO 1.62E+01 Fe-59 <4.32E+01 O.OOE+OO 4.32E+01 Co-60 <2.59E+01 O.OOE+OO 2.59E+01 Zn-65 <5.47E+01 O.OOE+OO 5.47E+01 Zr-95 <4.20E+01 O.OOE+OO 4.20E+01 Nb-95 <2.38E+01 O.OOE+OO 2.38E+01 1-131 <3.08E+01 O.OOE+OO 3.08E+01 Cs-134 <2.76E+01 O.OOE+OO 2.76E+01 Cs-137 <2.79E+01 O.OOE+OO 2.79E+01 BaLa-140 <3.52E+01 O.OOE+OO 3.52E+01 Be-7 2.72E+03 3.93E+02 2.75E+02 K-40 4.34E+03 6.25E+02 4.22E+01 Sample ID: 488877 Sample Dates: 11/5/2018 -11/5/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <1 .85E+01 O.OOE+OO 1.85E+01 Co-58 <2 .11E+01 O.OOE+OO 2.11E+01 Fe-59 <4.83E+01 O.OOE+OO 4.83E+01 Co-60 <1 .66E+01 O.OOE+OO 1.66E+01 Zn-65 <4.85E+01 O.OOE+OO 4.85E+01 Zr-95 <3.24E+01 O.OOE+OO 3.24E+01 Nb-95 <1 .94E+01 0.00E+OO 1.94E+01 1-131 <4.35E+01 O.OOE+OO 4 .35E+01 Cs-134 <2.04E+01 O.OOE+OO 2.04E+01 Cs-137 <1.66E+01 O.OOE+OO 1.66E+01 BaLa-140 <2.91E+01 O.OOE+OO 2.91 E+01 Be-7 2.35E+03 3.23E+02 2.23E+02 K-40 3.90E+03 5.14E+02 2.45E+02 Sample ID: 490826 Sample Dates: 12/3/2018 -12/3/2018 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3 .58E+01 O.OOE+OO 3.58E+01 Co-58 <4.15E+01 O.OOE+OO 4.15E+01 Fe-59 <6 .55E+01 O.OOE+OO 6.55E+01 Co-60 <4 .15E+01 O.OOE+OO 4.15E+01 Zn-65 <6.26E+01 O.OOE+OO 6.26E+01 Zr-95 <5.57E+01 O.OOE+OO 5.57E+01 Nb-95 <4.10E+01 O.OOE+OO 4 .10E+01 1-131 <4 .28E+01 O.OOE+OO 4.28E+01 Cs-134 <4.46E+01 O.OOE+OO 4.46E+01 Cs-137 <3.29E+01 O.OOE+OO 3.29E+01 BaLa-140 <6.23E+01 O.OOE+OO 6.23E+01 Be-7 4.36E+03 6.73E+02 4.67E+02 K-40 2.92E+03 6.90E+02 5.38E+02 Report Generated@ 5/1/2019 11 :57:36 EnRad Laboratories Appendix E - Page 91 of 91 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

APPENDIX F ERRATA TO PREVIOUS REPORTS Appendix F - Page 1

APPENDIX F ERRATA TO THE 2018 AREOR Oconee AREOR: 2017 Table 2.1-B in the 2017 AREOR incorrectly identified TLD Locations 077, 078.1, 085, 086, 087, 088, 089, and 090 as Measure Type of Special Interest (SI). The Measurement Type should have been Inner Ring (IR). The Inner Ring Average (mRem/yr) in Table 3.8-A and Figure 3.8 were also incorrect due to these TLD location being omitted from the Inner Ring Average calculation in 2017.

Appendix F - Page 2

TABLE 2.1-B OCONEE RADIOLOCICAL MONITORING PROGRAM SAMPLING LOCATIONS (TLD SITES)

Table 2.1-B Codes IR Inner Ring OR Outer Ring C Control SI Special Interest Site Measure Location* Distance Sector Site Measure Location* Distance Sector

Type (miles) # Type (miles) 020 IR Site Boundary 0.16 N 044 OR HWY 130 at Little River Dam 3.96 S Terminus of HWY 588 021 IR Site Boundary 0.25 NNE 045 OR at Crooked Creek 4.78 SSW HWY 188 at 022 IR Site Boundary 0.53 NE 046 OR Crooked Creek 4.61 SW 023 IR Site Boundary 0.93 ENE 047 OR New Hope Church, HWY 188 3.58 WSW 024 IR Site Boundary 0.81 E 048 OR JCT HWY 175 & 188 3.64 W 025 IR Site Boundary 0.42 ESE 049 OR JCT HWY 201 & 92 3.60 WNW Stamp Creek Landing, 026 IR Site Boundary 0.34 SE 050 OR End of HWY 92 3.53 NW HWY 128, 027 IR Site Boundary 0.49 SSE 051 OR 1 mile N OF HWY 130 4.64 NNW DPC Branch Office Site, 028 IR Site Boundary 0.46 S 052 SI Pickens 12.4 ENE 029 IR Site Boundary 0.56 SSW 053 SI DPC Branch Office Site, Liberty 11.7 E 030 IR Site Boundary 0.42 SW 054 SI Post Office - HWY 93 Norris 8.60 ESE 031 IR Site Boundary 0.27 WSW 055 SI Clemson Meteorology Plot 9.27 SSE 076 IR Site Boundary 0.19 W 056 SI Water Tower - Seneca 7.30 SSW 032 IR Site Boundary 0.19 WNW 057 SI Oconee Memorial Hospital 8.42 SW 033 IR Site Boundary 0.21 WNW 058 C Branch Rd Substation, Walhalla 9.39 WSW 034 IR Site Boundary 0.22 NW 059 SI Tamassee Dar School 9.20 NW Skimmer wall shared with air 035 IR Site Boundary 0.17 NNW 077** IR monitoring station 1.00 SW ONS Recreation Site shared 036 OR Mile Creek Landing 4.18 N 078.1** IR with air monitoring station 0.53 WSW 037 OR Keowee Church, HWY 327 4.85 NNE 081 C Clemson Operations Center 9.33 SE Convenience Mart, Lake Services Bldg 9125 shared 038 OR JCT HWY 183 & 133 4.24 NE 085** IR with air monitoring location 0.88 NNW HWY 133, 1 mile East Lake Keowee Service Rd at 039 OR of JCT HWY 183 & 133 4.02 ENE 086** IR Boat Landing 0.83 NW 040 OR Microwave Tower, Six Mile 4.74 E 087** IR End of Waterfall Rd 1.33 WNW Doug Hollow Rd / Transmission 041 OR JCT HWY 101 & 133 4.25 ESE 088** IR Tower 1.00 SSW Lawrence Chapel Church, Intersection 042 OR HWY 133 4.93 SE 089** IR Hwy 130 & Keowee River Rd 1.19 S HWY 291 at Crescent Resources, Keowee 043 OR Issaqueena Park 4.09 SSE 090** IR River Rd at Beaver Dam 0.79 SE

GPS data reflect accuracy to within 2-5 meters. GPS field measurements were taken as close as possible to the item of interest.

- TLD location added to Oconee REMP, ODCM Revision 58 (NCR # 02035669).

Appendix F - Page 3

Table 3.8-A Direct Gamma Radiation (TLD) Results(1)

Inner Ring Average Outer Ring Average Control Average Year (mrem/yr) (mrem/yr) (mrem/yr)

Preoperational 1.07E2 1.18E2 1.42E2 1984 7.54E1 7.96E1 1.05E2 1985 1.11E2 1.15E2 1.49E2 1986 9.90E1 1.01E2 1.43E2 1987 8.01E1 8.44E1 9.91E1 1988 6.87E1 7.47E1 1.07E2 1989 6.05E1 5.86E1 8.49E1 1990 4.96E1 4.82E1 6.66E1 1991 5.81E1 6.18E1 8.36E1 1992 7.24E1 6.95E1 8.74E1 1993 7.11E1 7.66E1 8.84E1 1994 8.25E1 9.00E1 1.06E2 1995 8.89E1 9.66E1 1.25E2 1996 6.51E1 7.44E1 9.60E1 1997 6.92E1 7.96E1 9.93E1 1998 6.81E1 7.68E1 1.12E2 1999 7.08E1 7.84E1 9.88E1 2000 7.24E1 8.03E1 1.00E2 2001 6.99E1 7.83E1 9.71E1 2002 7.28E1 8.11E1 1.03E2 2003 7.36E1 8.23E1 1.03E2 2004 7.61E1 8.31E1 1.05E2 2005 7.54E1 8.46E1 9.95E1 2006 7.79E1 8.57E1 1.04E2 2007 7.70E1 8.55E1 1.03E2 2008 8.04E1 9.03E1 1.05E2 2009 8.08E1 8.98E1 1.06E2 2010 7.94E1 8.85E1 9.77E1 2011 7.96E1 8.91E1 1.05E2 2012 7.89E1 8.79E1 1.05E2 2013 7.83E1 8.84E1 1.06E2 2014 7.58E1 8.46E1 1.05E2 2015 7.48E1 8.67E1 1.04E2 2016 7.59E1 8.65E1 1.06E2 2017 7.32E1 8.17E1 1.01E2 (1) 2014 AREOR, tabular results converted from mR/yr to mrem/yr (n

0.95)

Appendix F - Page 4

Figure 3.8 mrem/year Direct Gamma Radiation (TLD) Results 250 200 1 50

,.---...-1"** *-*-*=*._.* ~

~

......... * --- .~*~...

] 1984 1988 1992 1996 2000 2004 2008 2012 2016

- . - inner Ring -II- Oute r Rin g _._ control There is no reporting level for Direct Radiation (TLD)

Appendix F - Page 5

RA-19-0226, 2018 Annual Radiological Environmental Operating Report (AREOR)

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