Text

Annual Radiological Environmental Operating Report for 2015
	ML16146A710
Person / Time
Site:	Oconee
Issue date:	05/24/2016
From:	; Duke Energy Carolinas
To:	; Office of Nuclear Reactor Regulation
References
	Download: ML16146A710 (177)
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ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT DUKE ENERGY CORPORATION OCONEE NUCLEAR STATION Units 1, 2, and 3 2015

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 Level 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 . . . . . . . 3-2 3.2 Drinking Water . . . . . . . . . . . . 3-5 3.3 Surface Water . . . . . . . . . . . . 3-7 3.4 Milk . . . . . . . . . . . . . . 3-10 3.5 Broadleaf Vegetation . . . . . . . . . . 3-12 3.6 Fish . . . . . . . . . . . . . . 3-14 3.7 Shoreline Sediment . . . . . . . . . . . 3-17 3.8 Direct Gamma Radiation . . . . . . . . . . 3-19 3.8.1 Environmental TLD . . . . . . . . . . 3-19 3.8.2 ISFSI . . . . . . . . . . . . 3-20 3.9 Land Use Census . . . . . . . . . . . 3-24 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 Duke Energy Interlaboratory Program . . . . . . 5-2 5.5.2 Eckert & Ziegler Analytics Cross Check Program . . . . 5-2 5.5.3 ERA Proficiency Testing . . . . . . . . . 5-4 5.6 Intercomparison Program . . . . . . . . . . 5-4 5.7 TLD Intercomparison Program . . . . . . . . . 5-4 5.7.1 Nuclear Technology Services Intercomparison Program . . . 5-4 5.7.2 Internal Cross Check (Duke Energy) . . . . . . . 5-4 5.8 General Engineering Laboratory (GEL) . . . . . . . 5-5 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 i

IV. Sampling and Analysis Procedures . . . . . . . . A-3 A.1 Airborne Particulate and Radioiodine . . . . . . A-3 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-2 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 . . . . . . 3-4 3.2 Concentration of Tritium in Drinking Water . . . . . . 3-5 3.3 Concentration of Tritium in Surface Water . . . . . . . 3-8 3.5 Concentration of Cs-137 in Broadleaf Vegetation . . . . . 3-12 3.6-1 Concentration of Cs-137 in Fish . . . . . . . . 3-15 3.6-2 Concentration of Cs-134 in Fish . . . . . . . . 3-15 3.7 Concentration of Cs-137 in Shoreline Sediment . . . . . . 3-17 3.8 Direct Gamma Radiation (TLD) Results . . . . . . . 3-20 3.9 Oconee Nuclear Station 2015 Land Use Census Map . . . . . 3-25 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 Lower Limits of Detection . . . . . 2-9 3.1-A Mean Concentration of Air Radioiodine (I-131) . . . . . . 3-3 3.1-B Mean Concentration of Gross Beta in Air Particulate . . . . . 3-4 3.2 Mean Concentrations of Radionuclides in Drinking Water . . . . 3-6 3.3 Mean Concentrations of Radionuclides in Surface Water . . . . 3-9 3.4 Mean Concentration of Radionuclides in Milk . . . . . . 3-11 3.5 Mean Concentration of Radionuclides in Vegetation . . . . . 3-13 ii

3.6 Mean Concentrations of Radionuclides in Fish . . . . . . 3-16 3.7 Mean Concentrations of Radionuclides in Shoreline Sediment . . . 3-18 3.8-A Direct Gamma Radiation (TLD) Results . . . . . . . 3-21 3.8-B Direct Gamma Radiation (TLD) Oconee 2015 Investigation Level . . 3-22 3.9 Oconee 2015 Land Use Census Results . . . . . . . 3-24 4.1-A Oconee Nuclear Station 2015 Environmental and Effluent Dose Comparison . 4-3 4.1-B Maximum Individual Dose for 2015 based on Environmental Measurements (mrem) for Oconee Nuclear Station . . . . . 4-5 5.0-A Duke Energy Interlaboratory Comparison Program . . . . . 5-6 5.0-B Eckert & Ziegler Analytics Cross Check Program . . . . . 5-10 5.0-C Environmental Resource Associates (ERA) Proficiency Testing . . . 5-13 5.0-D 2015 Environmental Dosimeter Cross-Check Results . . . . . 5-14 5.0-E 2015 Annual Quality Assurance Report for the Radiological Environmental Monitoring Program for GEL Laboratories, LLC. . . . . . 5-16 LIST OF ACRONYMS USED IN THIS TEXT (in alphabetical order)

BW BiWeekly C Control EPA Environmental Protection Agency ERA Environmental Resource Associates GEL General Engineering Laboratory GI-LLI Gastrointestinal - Lower Large Intestine GPS Global Positioning System ISFSI Independent Spent Fuel Storage Installation LLD Lower Limit of Detection M Monthly MDA Minimum Detectable Activity MOA Memorandum of Agreement mrem Millirem NIST National Institute of Standards and Technology NRC Nuclear Regulatory Commission ODCM Offsite Dose Calculation Manual ONS Oconee Nuclear Station pCi/kg picocurie per kilogram pCi/l picocurie per liter pCi/m3 picocurie per cubic meter Q Quarterly REMP Radiological Environmental Monitoring Program SA Semiannually SLCs Selected Licensee Commitments SM Semimonthly TECH SPECs Technical Specifications TLD Thermoluminescent Dosimeter PCi/ml microcurie per milliliter UFSAR Updated Final Safety Analysis Report 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 2015.

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. Nine-hundred ninety-three samples were analyzed comprising 1,058 test results in order to compile data for the 2015 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 2015 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 5.13E-02 mrem for 2015. 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 An environmental monitoring program 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),

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

Section 2 - Page 2

2.3.2 LOWER LEVEL OF DETECTION AND MINIMUM DETECTABLE ACTIVITY The Lower Level 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 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" LLD's 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 Chernobyl accident or the Fukushima accident). 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 Section 2 - Page 4

Figure 2.1-2 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 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

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)

MICROWAVE TOWER, SIX 020 IR SITE BOUNDARY 0.16 N 040 OR MILE 4.74 E 021 IR SITE BOUNDARY 0.25 NNE 041 OR JCT HWY 101 & 133 4.25 ESE LAWRENCE CHAPEL 022 IR SITE BOUNDARY 0.53 NE 042 OR CHURCH, HWY 133 4.93 SE HWY 291 AT 023 IR SITE BOUNDARY 0.93 ENE 043 OR ISSAQUEENA PARK 4.09 SSE HWY 130 AT LITTLE 024 IR SITE BOUNDARY 0.81 E 044 OR RIVER DAM 3.96 S TERMINUS OF HWY 588 025 IR SITE BOUNDARY 0.42 ESE 045 OR AT CROOKED CREEK 4.78 SSW HWY 188 AT 026 IR SITE BOUNDARY 0.34 SE 046 OR CROOKED CREEK 4.61 SW NEW HOPE CHURCH, 027 IR SITE BOUNDARY 0.49 SSE 047 OR HWY 188 3.58 WSW 028 IR SITE BOUNDARY 0.46 S 048 OR JCT HWY 175 & 188 3.64 W 029 IR SITE BOUNDARY 0.56 SSW 049 OR JCT HWY 201 & 92 3.60 WNW STAMP CREEK LANDING, 030 IR SITE BOUNDARY 0.42 SW 050 OR END OF HWY 92 3.53 NW HWY 128, 1 MILE N OF 031 IR SITE BOUNDARY 0.27 WSW 051 OR HWY 130 4.64 NNW DPC BRANCH OFFICE 076 IR SITE BOUNDARY 0.19 W 052 SI SITE - PICKENS 12.4 ENE DPC BRANCH OFFICE 032 IR SITE BOUNDARY 0.19 WNW 053 SI SITE - LIBERTY 11.7 E POST OFFICE - HWY 93 033 IR SITE BOUNDARY 0.21 WNW 054 SI NORRIS 8.60 ESE CLEMSON 034 IR SITE BOUNDARY 0.22 NW 055 SI METEOROLOGY PLOT 9.27 SSE WATER TOWER - SENECA 035 IR SITE BOUNDARY 0.17 NNW 056 SI 7.30 SSW OCONEE MEMORIAL 036 OR MILE CREEK LANDING 4.18 N 057 SI HOSPITAL 8.42 SW KEOWEE CHURCH, BRANCH RD 037 OR HWY 327 4.85 NNE 058 C SUBSTATION,WALHALLA 9.39 WSW CONVENIENCE MART, 038 OR JCT HWY 183 & 133 4.24 NE 059 SI TAMASSEE DAR SCHOOL 9.20 NW HWY 133, 1 MILE EAST CLEMSON 039 OR OF JCT HWY 183 & 133 4.02 ENE 081 C OPERATIONS CENTER 9.33 SE

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

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 --- --- ---

AirParticulate Weekly --- --- --- X ---

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 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 2015 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 2015 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 2015 information required by Technical Specification Administrative Control 5.6.2 are located in Appendix B. REMP results for 2015 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 2015.

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 2015 due to ONS operation was 2.34% 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.

Data presented in Sections 3.1 - 3.8 support the conclusion that there were no significant increases in radionuclides in the environment around ONS due to station operations in 2015.

Section 3 - Page 1

3.1 AIRBORNE RADIOIODINE AND PARTICULATES In 2015, 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.

There was no detectable I-131 in air samples in 2015. Table 3.1-A gives the highest indicator location annual mean and control location annual mean for I-131 since the preoperational period.

The table shows 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 2015 due to ONS plant operations. No gamma emitting particulates due to ONS plant 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. 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 2

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

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 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 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 0.00E0 indicates no detectable measurements 1979 - 1986 mean based on all net activity 2011 concentration affected by Fukushima Daiichi (1) 1987 - Gamma spectroscopy system change (2) 2014 - Gamma spectroscopy system change Section 3 - Page 3

Figure 3.1 There is no reporting level for gross beta in air particulate Table 3.1-B Mean Concentration of Gross Beta in Air Particulate Monitoring Period Indicator Location (pCi/m3) Control Location (pCi/m3) 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 2.05E-2 1.94E-2 2002 2.01E-2 1.84E-2 2003 1.86E-2 1.82E-2 2004 1.92E-2 1.90E-2 2005 1.95E-2 1.91E-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 1.92E-2 2012 2.63E-2 1.97E-2 2013 1.96E-2 1.74E-2 2014 2.11E-2 1.86E-2 Average (2005 - 2014) 2.10E-2 1.94E-2 2015 2.13E-2 1.78E-2 Section 3 - Page 4

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 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 lists the highest indicator location annual mean and control location annual mean for gross beta results since the preoperational period. The indicator location had an average concentration of 2.34 pCi/liter in 2015, and the control location had a concentration of 1.46 pCi/liter. For comparison purposes, the 2014 indicator mean was 1.43 pCi/liter. The table shows that 2015 gross beta levels in drinking water are lower than preoperational concentrations.

The dose for consumption of water was less than one mrem per year and there were no abnormal releases exceeding 1 pCi/liter I-131 in 2015; therefore low-level iodine analysis is not required.

Tritium was detected in three of the twelve composite samples during 2015. The 2015 mean indicator location 066 concentration was 325 pCi/liter, which is 1.63% of the 20,000 pCi/l Tritium reporting level. Table 3.2 and Figure 3.2 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 2015. Gamma spectroscopy analysis has not detected any gamma activity in the water supplies since 1988. K-40 observed in drinking water samples is a naturally occurring radionuclide.

Figure 3.2 Current reporting level implemented 1984 Section 3 - Page 5

Table 3.2 Mean Concentrations of Radionuclides in Drinking Water 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 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 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 6

3.3 SURFACE WATER Gamma spectroscopy was performed on 26 monthly surface water samples. These samples were composited to form eight quarterly 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 2015 average concentration was 7,730 pCi/liter. The individual samples ranged from 4,460 to 9,900 pCi/liter. For comparison purposes, the 2014 mean concentration was 3,490 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 lists the indicator annual means.

Gamma spectroscopy analysis did not detect any station related gamma activity during 2015. No gamma emitting radionuclides attributable to station operation have been detected in surface water samples since 1999. Table 3.3 summarizes 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 2015 did not reveal any increasing trends.

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

Section 3 - Page 7

Figure 3.3 There is no reporting level for Tritium in surface water Section 3 - Page 8

Table 3.3 Mean Concentrations of Radionuclides in Surface Water 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 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(2) 0.00E0 0.00E0 0.00E0 0.00E0 3.49E3 2015 0.00E0 0.00E0 0.00E0 0.00E0 7.73E3 0.00E0 indicates no detectable measurements 1979-1986 mean based on all net activity results (1) 1987 - Gamma spectroscopy system change (2) 2014 - Gamma spectroscopy system change Section 3 - Page 9

3.4 MILK Gamma spectroscopy and low level iodine analysis was performed on 26 milk samples collected from the control location in 2015. No indicator dairies were sampled during 2015 and none were identified by the 2015 land use census.

There were no gamma emitting radionuclides due to ONS plant operations identified in milk samples in 2015. 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 lists the highest indicator location annual mean and control location annual mean for Cs-137 since the preoperational period. The table shows similar concentrations for both indicator and control locations.

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

Section 3 - Page 10

Table 3.4 Mean Concentration of Radionuclides in Milk 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 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 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 0.00E0 indicates no detectable measurements 1979 - 1986 mean based on all net activity results (1) 1987 - Gamma spectroscopy system change (2) 2014 - Gamma spectroscopy system change The Oconee milk program was updated to align with NUREG-1301 during 2005 and documented in NCR # 01753418. Location 071 was designated as the new control site effective with the 7/12/2005 sampling. No indicator dairies were identified by the 2015 land use census.

Section 3 - Page 11

3.5 BROADLEAF VEGETATION Gamma spectroscopy was performed on 48 broadleaf vegetation samples during 2015. Three indicator locations and one control location were sampled. There were no gamma emitting radionuclides attributable to ONS station operation identified in vegetation samples in 2015.

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-137.

It is not unusual for Cs-137 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 stations 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 2011 concentration affected by Fukushima Daiichi Section 3 - Page 12

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 4.74E2g 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 1.61E2gg 1999 1.34E2 0.00E0ggg 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 6.68E1gggg 3.35E1gggg 2012 0.00E0 0.00E0 2013 2.57E1 0.00E0 2014(2) 0.00E0 0.00E0 2015 0.00E0 0.00E0 0.00E0 indicates no detectable measurements g Control location changed to 073 in 1984 Qualitative results reported prior to 1974 gg Control location 081 added in 1998 1979 - 1986 mean based on all net activity ggg Control location 073 removed in 1999 (1) 1987 - Gamma spectroscopy system change gggg 2011 concentration affected by Fukushima Daiichi (2) 2014 - Gamma spectroscopy system change Section 3 - Page 13

3.6 FISH In 2015, gamma spectroscopy was performed on 12 fish samples. Two downstream indicator and one control location were sampled. Cs-137 was identified in five of the eight indicator location samples. Cs-137 was detected in one of the four control location samples at a mean concentration of 12.0 pCi/kg. The highest average indicator concentration for Cs-137 was 19.4 pCi/kg (0.97 % of reporting level).

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 2015. 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 14

Figure 3.6-1 Figure 3.6-2 Current reporting levels implemented 1984 Section 3 - Page 15

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 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 change Section 3 - Page 16

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 two of the four indicator location samples. Cs-137 was not identified in the control location samples. The highest 2015 individual sample Cs-137 concentration was 22.4 pCi/kg. For comparison, the highest 2014 individual sample Cs-137 concentration was 21.1 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 There are no reporting levels for shoreline sediment Section 3 - Page 17

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 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 change Section 3 - Page 18

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. 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 2015, 168 total TLDs were analyzed, 160 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 104 mrem at indicator location 040, 4.74 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 2015 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 2015 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 2015, 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.

Section 3 - Page 19

A TLD intercomparison program is conducted as part of the quality assurance program. Results of this program are included in section 5.9.

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 631 mrem per standard quarter. This is consistent with previous measurements.

Figure 3.8 There is no reporting level for Direct Radiation (TLD)

Section 3 - Page 20

Table 3.8-A Direct Gamma Radiation (TLD) Results 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 Section 3 - Page 21

Table 3.8-B Direct Gamma Radiation (TLD) Oconee 2015 Investigation Level Oconee 2015 MDDQ: 7 Oconee 2015 MDDA: 11 Quarterly (mrem) Annual(mrem)

Location BQ MQQ1 MQQ2 MQQ3 MQQ4 LQQ1 LQQ2 LQQ3 LQQ4 BA M A* LA 20 18.9 18.7 19.1 17.3 18.5 ND ND ND ND 75.7 73.6 ND 21 14.0 15.8 14.1 12.5 13.3 ND ND ND ND 56.9 55.7 ND 22P 21.8 22.6 23.3 20.8 21.6 ND ND ND ND 89.7 88.3 ND 23P 21.9 24.1 21.9 20.3 22.6 ND ND ND ND 87.8 88.9 ND 24P 22.8 26.6 22.9 22.3 23.5 ND ND ND ND 98.6 95.3 ND 25 17.1 19.8 17.2 17.0 17.1 ND ND ND ND 72.9 71.1 ND 26 16.5 16.1 16.7 15.2 16.0 ND ND ND ND 67.2 63.9 ND 27P 19.2 20.0 17.4 18.1 18.5 ND ND ND ND 78.1 74.1 ND 28 17.0 18.7 15.6 15.0 17.9 ND ND ND ND 68.3 67.2 ND 29 15.7 19.5 15.0 14.3 15.5 ND ND ND ND 63.3 64.3 ND 30 17.0 18.6 16.4 16.1 18.1 ND ND ND ND 70.6 69.2 ND 31 16.4 17.2 14.6 14.8 16.3 ND ND ND ND 65.7 63.0 ND 32 22.9 20.8 18.0 16.8 19.4 ND ND ND ND 94.5 75.0 ND 33 19.5 17.8 16.6 15.6 17.3 ND ND ND ND 77.9 67.3 ND 34 21.5 19.9 16.4 15.8 17.9 ND ND ND ND 86.0 69.9 ND 35 22.9 25.6 22.9 21.7 24.1 ND ND ND ND 93.3 94.2 ND 36P 26.5 26.0 22.6 27.0 ND ND ND ND 105.1 100.8 ND 37P 20.4 21.2 17.9 17.8 17.8 ND ND ND ND 82.0 74.6 ND 38P 21.9 23.0 22.5 22.0 22.7 ND ND ND ND 87.5 90.3 ND 39P 24.2 24.8 23.8 22.6 24.7 ND ND ND ND 96.2 95.9 ND 40 23.7 27.9 24.9 23.9 26.2 ND ND ND ND 101.1 103.0 ND 41P 17.3 18.4 15.7 15.2 17.4 ND ND ND ND 69.1 66.7 ND 42P 25.0 27.6 24.2 24.5 26.1 ND ND ND ND 102.2 102.5 ND 43 23.8 25.2 22.1 23.7 24.4 ND ND ND ND 95.3 95.4 ND 44P 18.3 20.0 18.6 17.3 19.0 ND ND ND ND 80.0 74.9 ND 45P 17.0 18.1 15.3 15.6 16.6 ND ND ND ND 67.9 65.6 ND 46P 21.5 28.0 21.2 21.3 23.2 ND ND ND ND 91.8 93.7 ND 47 22.4 25.4 21.1 20.7 21.5 ND ND ND ND 91.1 88.6 ND 48P 25.3 27.7 24.6 23.1 24.2 ND ND ND ND 101.3 99.7 ND 49P 20.7 21.9 21.1 21.5 21.6 ND ND ND ND 82.6 86.0 ND 50P 17.7 18.2 17.9 16.3 22.5 ND ND ND ND 70.9 75.0 ND 51P 19.0 23.4 18.4 18.2 19.0 ND ND ND ND 76.2 79.0 ND 52P 22.9 27.6 23.1 22.4 23.0 ND ND ND ND 94.8 96.0 ND 53P 25.1 27.3 23.6 22.0 24.8 ND ND ND ND 102.3 97.7 ND 54P 18.5 20.0 17.6 16.2 17.9 ND ND ND ND 76.5 71.6 ND 55P 15.5 17.8 15.2 16.0 16.5 ND ND ND ND 65.1 65.5 ND 56P 22.8 26.1 22.0 21.7 24.2 ND ND ND ND 91.8 94.1 ND 57P 22.4 25.9 22.7 21.9 22.8 ND ND ND ND 93.6 93.3 ND 58 29.3 32.6 32.0 29.5 29.7 ND ND ND ND 119.7 123.8 ND 59 24.1 25.0 23.8 23.4 25.0 ND ND ND ND 98.5 97.1 ND 76 20.8 21.9 21.1 21.3 23.1 ND ND ND ND 89.0 87.3 ND 81 21.9 23.8 21.1 20.6 23.2 ND ND ND ND 91.1 88.6 ND

Madeterminedbynormalizingavailablequarterlydatato4fullquarters

(note)

indicatesnodataresultingfrommissingTLD,erroneousTLDreading,oromittedafterinvestigation .

Note:Datamaybeomittedafterinvestigationconsideringthefollowing:

x OtherTLDlocationsdatafromupwind,downwind,andadjacentsectors

x Reviewofdocumentationonlocation'scharacteristics,geography,topography,etc.

x Comparisonwithotherradiologicaldata(i.e.gaseouseffluentreleases,directradiationreports,surveys,dose

calculations,AreaTLDs,etc.)

Section 3 - Page 22

Table 3.8-B definition of terms x MDDQ = minimum differential dose, quarterly, 3 times 90th percentile sQ determined from analysis in mrem x MDDA = minimum differential dose, annual, 3 times 90th percentile sA determined from analysis in mrem x BQ = Quarterly baseline (mrem) x MQ = locations 91 day standard quarter normalized dose (mrem per standard quarter) averaged between multiple TLDs at each location. Appendix B and Appendix E indicate only the Alpha TLD and are not average values.

x LQ = quarterly investigation level dose (mrem) x BA = baseline background dose (mrem) (annual) x MA = annual monitoring data - Ma determined by normalizing available quarterly data to 4 full quarters x LA = annual investigation level dose (mrem) x ND = not detected

Section 3 - Page 23

3.9 LAND USE CENSUS The Land Use Census was conducted during the growing season (5/19 - 5/20/2015) 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. No program changes were required based on the results of the census.

Table 3.9 Oconee 2015 Land Use Census Results Sector Distance Sector Distance (Miles) (Miles)

Nearest Residence 2.98 Nearest Residence 1.96 N Nearest Milk Animal - S Nearest Milk Animal -

Nearest Residence 1.84 Nearest Residence 1.36 NNE Nearest Milk Animal - SSW Nearest Milk Animal -

Nearest Residence 1.20 Nearest Residence 1.31 NE Nearest Milk Animal - SW Nearest Milk Animal -

Nearest Residence 1.34 Nearest Residence 1.76 ENE Nearest Milk Animal - WSW Nearest Milk Animal -

Nearest Residence 1.64 Nearest Residence 1.58 E Nearest Milk Animal - W Nearest Milk Animal -

Nearest Residence 1.57 Nearest Residence 1.35 ESE Nearest Milk Animal - WNW Nearest Milk Animal -

Nearest Residence 1.46 Nearest Residence 1.04 SE Nearest Milk Animal - NW Nearest Milk Animal -

Nearest Residence 1.54 Nearest Residence 1.03 SSE Nearest Milk Animal - NNW Nearest Milk Animal -

- indicates no occurrences within the 5 mile radius

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

Section 3 - Page 24

Figure 3.9 Section 3 - Page 25

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 2015 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, 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 2015 was 3.36E-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 2015 liquid and gaseous effluent release data. Effluent-based dose estimates were calculated using the RETDAS computer program 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 RETDAS 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 indicate 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 2015 environmental sample results was 5.93E-2 mrem to the child liver. The maximum total organ dose of 1.71E-1 mrem for liquid effluent-based estimates was to the child liver.

In calculations based on gaseous release pathways, vegetation was the predominant dose pathway for effluent samples. The gaseous effluent dose is due to C-14 and tritium in broadleaf vegetation. The maximum total organ dose for gaseous effluent estimates was 3.51E-1 mrem to the child bone, with C-14 being the primary dose contributor. No radioactivity was detected from gaseous pathways in environmental samples; therefore, there is no calculated dose.

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 2015 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 063 (0.80 mi ESE) 5.88E-05 Skin Effluent Teen Shoreline Sediment Discharge Pt. 3.50E-04 Bone Environmental Child Fish 067 (4.34 mi SSE) 1.67E-02 Bone Effluent Child Fresh Water Fish Discharge Pt. 3.16E-02 Liver Environmental Child Drinking Water 066 (18.9 mi SSE) 5.93E-02 Liver Effluent Child Drinking Water 18.9 mi SSE 1.71E-01 T. Body Environmental Adult Fish 067 (4.34 mi SSE) 5.13E-02 T. Body Effluent Adult Fresh Water Fish Discharge Pt. 1.57E-01 Thyroid Environmental Child Drinking Water 066 (18.9 mi SSE) 4.33E-02 Thyroid Effluent Child Drinking Water 18.9 mi SSE 1.44E-01 Kidney Environmental Child Drinking Water 066 (18.9 mi SSE) 4.86E-02 Kidney Effluent Child Drinking Water 18.9 mi SSE 1.53E-01 Lung Environmental Child Drinking Water 066 (18.9 mi SSE) 4.52E-02 Lung Effluent Child Drinking Water 18.9 mi SSE 1.47E-01 GI-LLI Environmental Child Drinking Water 066 (18.9 mi SSE) 4.34E-02 GI-LLI Effluent Adult Fresh Water Fish 18.9 mi SSE 1.64E-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.

(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 - - - 0.00E+00 Skin Effluent All Ground Plane 1.0 mi. SW 9.17E-12 Bone Environmental - - - 0.00E+00 Bone Effluent Child Vegetation 1.0 mi. SW 3.51E-01 Liver Environmental - - - 0.00E+00 Liver Effluent Child Vegetation 1.0 mi. SW 1.25E-01 T. Body Environmental - - - 0.00E+00 T. Body Effluent Child Vegetation 1.0 mi. SW 1.25E-01 Thyroid Environmental - - - 0.00E+00 Thyroid Effluent Child Vegetation 1.0 mi. SW 1.25E-01 Kidney Environmental - - - 0.00E+00 Kidney Effluent Child Vegetation 1.0 mi. SW 1.25E-01 Lung Environmental - - - 0.00E+00 Lung Effluent Child Vegetation 1.0 mi. SW 1.25E-01 GI-LLI Environmental - - - 0.00E+00 GI-LLI Effluent Child Vegetation 1.0 mi. SW 1.25E-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.

(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 2015 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 3.30E-02 3.30E-02 3.30E-02 3.30E-02 3.30E-02 3.30E-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 3.30E-02 3.30E-02 3.30E-02 3.30E-02 3.30E-02 3.30E-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 3.36E-02 3.36E-02 3.36E-02 3.36E-02 3.36E-02 3.36E-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 1.67E-02 2.57E-02 1.21E-02 9.74E-03 1.50E-02 1.16E-02 9.84E-03 0.00E+00 Shoreline Sediment 0.00E+00 0.00E+00 1.05E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1.23E-05 TOTAL 1.67E-02 5.93E-02 4.57E-02 4.33E-02 4.86E-02 4.52E-02 4.34E-02 1.23E-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 1.76E-02 1.76E-02 1.76E-02 1.76E-02 1.76E-02 1.76E-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 1.33E-02 2.94E-02 1.79E-02 1.18E-02 1.78E-02 1.41E-02 1.21E-02 0.00E+00 Shoreline Sediment 0.00E+00 0.00E+00 5.04E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 5.88E-05 TOTAL 1.33E-02 4.70E-02 3.56E-02 2.94E-02 3.54E-02 3.17E-02 2.97E-02 5.88E-05 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 2.49E-02 2.49E-02 2.49E-02 2.49E-02 2.49E-02 2.49E-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 1.24E-02 3.23E-02 2.64E-02 1.53E-02 2.11E-02 1.73E-02 1.57E-02 0.00E+00 Shoreline Sediment 0.00E+00 0.00E+00 9.03E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1.05E-05 TOTAL 1.24E-02 5.72E-02 5.13E-02 4.02E-02 4.60E-02 4.22E-02 4.06E-02 1.05E-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 2015 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-07 066 325 0.00E+00 3.30E-02 3.30E-02 3.30E-02 3.30E-02 3.30E-02 3.30E-02 Dose Commitment (mrem) = 0.00E+00 3.30E-02 3.30E-02 3.30E-02 3.30E-02 3.30E-02 3.30E-02 Section 4 - Page 6

Oconee Nuclear Station Dose from Drinking Water Pathway for 2015 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-07 066 325 0.00E+00 3.36E-02 3.36E-02 3.36E-02 3.36E-02 3.36E-02 3.36E-02 Dose Commitment (mrem) = 0.00E+00 3.36E-02 3.36E-02 3.36E-02 3.36E-02 3.36E-02 3.36E-02 Section 4 - Page 7

Oconee Nuclear Station Dose from Fish Pathway for 2015 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 = 7730 pCi/l x 0.9 = 6957 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-06 067 7.40 1.67E-02 1.60E-02 2.36E-03 0.00E+00 5.21E-03 1.87E-03 1.00E-04 H-3 NO DATA 2.03E-07 2.03E-07 2.03E-07 2.03E-07 2.03E-07 2.03E-07 063 6957 0.00E+00 9.74E-03 9.74E-03 9.74E-03 9.74E-03 9.74E-03 9.74E-03 Dose Commitment (mrem) = 1.67E-02 2.57E-02 1.21E-02 9.74E-03 1.50E-02 1.16E-02 9.84E-03 Section 4 - Page 8

Oconee Nuclear Station Dose from Shoreline Sediment Pathway for 2015 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-09 063 22.4 1.05E-05 1.23E-05 Dose Commitment (mrem) = 1.05E-05 1.23E-05 Section 4 - Page 9

Oconee Nuclear Station Dose from Drinking Water Pathway for 2015 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-07 066 325 0.00E+00 1.76E-02 1.76E-02 1.76E-02 1.76E-02 1.76E-02 1.76E-02 Dose Commitment (mrem)= 0.00E+00 1.76E-02 1.76E-02 1.76E-02 1.76E-02 1.76E-02 1.76E-02 Section 4 - Page 10

Oconee Nuclear Station Dose from Fish Pathway for 2015 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 = 7730 pCi/l x 0.9 = 6957 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-06 067 7.40 1.33E-02 1.76E-02 6.14E-03 0.00E+00 6.00E-03 2.33E-03 2.51E-04 H-3 NO DATA 1.06E-07 1.06E-07 1.06E-07 1.06E-07 1.06E-07 1.06E-07 063 6957 0.00E+00 1.18E-02 1.18E-02 1.18E-02 1.18E-02 1.18E-02 1.18E-02 Dose Commitment (mrem) = 1.33E-02 2.94E-02 1.79E-02 1.18E-02 1.78E-02 1.41E-02 1.21E-02 Section 4 - Page 11

Oconee Nuclear Station Dose from Shoreline Sediment Pathway for 2015 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-09 063 22.4 5.04E-05 5.88E-05 Dose Commitment (mrem) = 5.04E-05 5.88E-05 Section 4 - Page 12

Oconee Nuclear Station Dose from Drinking Water Pathway for 2015 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-07 066 325 0.00E+00 2.49E-02 2.49E-02 2.49E-02 2.49E-02 2.49E-02 2.49E-02 Dose Commitment (mrem) = 0.00E+00 2.49E-02 2.49E-02 2.49E-02 2.49E-02 2.49E-02 2.49E-02 Section 4 - Page 13

Oconee Nuclear Station Dose from Fish Pathway for 2015 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 = 7730 pCi/l x 0.9 = 6957 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-06 067 7.40 1.24E-02 1.69E-02 1.11E-02 0.00E+00 5.75E-03 1.91E-03 3.28E-04 H-3 NO DATA 1.05E-07 1.05E-07 1.05E-07 1.05E-07 1.05E-07 1.05E-07 063 6957 0.00E+00 1.53E-02 1.53E-02 1.53E-02 1.53E-02 1.53E-02 1.53E-02 Dose Commitment (mrem) = 1.24E-02 3.23E-02 2.64E-02 1.53E-02 2.11E-02 1.73E-02 1.57E-02 Section 4 - Page 14

Oconee Nuclear Station Dose from Shoreline Sediment Pathway for 2015 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-09 063 22.4 9.03E-06 1.05E-05 Dose Commitment (mrem) = 9.03E-06 1.05E-05 Section 4 - Page 15

5.0 QUALITY ASSURANCE 5.1 SAMPLE COLLECTION EnRad Laboratories, Fisheries and Aquatic Ecology 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 2015, a vendor laboratory, General Engineering Laboratory, LLC (GEL), performed some environmental sample analyses as specified by approved analysis procedures.

5.3 DOSIMETRY ANALYSIS The Radiation Dosimetry and Records group performed the environmental dosimetry measurements as specified by approved dosimetry analysis procedures.

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, surface water, and ground water samples.

Section 5 - Page 1

5.5 DUKE ENERGY INTERLABORATORY COMPARISON PROGRAM In 2015 Duke Energy Environmental Laboratory (EnRad) participated in interlaboratory programs to satisfy Radiological Environmental Monitoring Program requirements in Duke Energy nuclear plant Offsite Dose Calculation Manuals and Selected Licensee Commitments Manuals, as applicable. In addition, EnRad Laboratory participated in the Environmental Resource Associates (ERA) RadCheMTM Proficiency Testing program to satisfy the North Carolina state drinking water radiochemistry certification requirements.

EnRad Laboratory participated in three interlaboratory programs: Eckert & Ziegler Analytics (EZA), ERA, and Fleet Scientific Services (FSS). EZA results were evaluated against IP 84750 acceptance criteria stated in EnRad procedure 515, Cross Check Program Administration. ERA evaluated the results reported by EnRad based on the National Environmental Laboratory Accreditation Conference (NELAC) Field of Proficiency Testing criteria. FSS results were evaluated as prescribed in the Duke Energy Nuclear Generation Procedure SRPMP 9-2.

Low-level Iodine-131 analysis of drinking water was not required during 2015 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 2015 in the ONS program.

This dose was calculated monthly during 2015 to ensure that low-level Iodine-131 analysis of drinking water samples was not required.

5.5.1 DUKE ENERGY INTERLABORATORY PROGRAM EnRad Laboratories participated in the Duke Energy Fleet Scientific Services (FSS) Interlaboratory Program during 2015. Interlaboratory cross check samples including mixed gamma in water (Marinelli beakers), low-level I-131 in water, gross beta in water, and tritium in water samples were analyzed during 2015. A summary of the EnRad Laboratory program results for 2015 is documented in Table 5.0-A.

5.5.2 ECKERT & ZIEGLER ANALYTICS CROSS CHECK PROGRAM EnRad Laboratories participated in the Eckert & Ziegler Analytics Cross Check Program during 2015. Cross check samples including air filters (single and composites), air cartridges, gross beta in water, various mixed gamma samples in Marinelli beakers (soil, vegetation, milk, and water), tritium in water, and Iodine in milk and water samples were analyzed at various times of the year. A summary of the EnRad Laboratory program results for 2015 is documented in Table 5.0-B.

Interlaboratory cross check samples from EZA were received and analyzed in all four quarters of 2015. During 2015, there were three EZA Cross Check results in non-agreement. The first non-agreement result was in the second quarter mixed gamma in vegetation sample (E11250). Agreement was achieved in seven of eight identified nuclides, with Cs-137 being the nuclide that was found in non-agreement (NCR # 01939292). Due to the non-agreement, an evaluation was conducted to track actions and resolve how to prevent recurrence. The evaluation identified a slight negative bias for all nuclides which could be attributed to three Section 5 - Page 2

factors: (1) mismatch between cross check geometry and calibration geometry fill-depth, (2) insufficient training of laboratory personnel regarding the importance of geometry effects, and (3) EnRad procedure # 52 when revised the procedural guidance on sample preparation to agree with calibration geometries' fill-depth was removed. How to prevent recurrence: (1) laboratory personnel were provided training to ensure an understanding of the importance of reproducing the proper geometry in all sample analyses, (2) ensure cross checks are ordered that correctly reflect calibration geometries, (3) revise EnRad procedure # 52 to address proper sample preparation to ensure proper geometry agreement, and (4) request from EZA a third quarter mixed gamma in vegetation (E11335) sample (all nuclides were in agreement and no bias was present).

The next two non-agreement results were second quarter LLI-131 in Water (E11248) and third quarter LLI-131 in Water (E11337); NCR # 01937710 and NCR # 01967544 respectively. After the second failure, the LLI-131 in Water analysis was immediately suspended at EnRad Analytical Laboratory (October 2015) and samples requiring this analysis were sent to a vendor lab (GEL). During the fourth quarter of 2015, EnRad requested and analyzed six LLI-131 in Water samples prepared by FSS and all samples were in agreement. Second quarter LLI-131 in Water (E11248) - NCR # 01937710 non-agreement was determined to have been caused by an incomplete chemical separation as the source of the cross check failure. The exact cause of the incomplete separation could not be established and given that the accompanying QC samples were acceptable, no precise cause could be attributed to the failure. In accordance with standard practice, another cross check was obtained for third quarter 2015 to validate the LLI-131 in Water methodology. The third quarter LLI-131 in Water (E11337) also yielded unacceptable results (NCR # 01967544) with result similar to the second quarter results. Immediate corrective actions included reviewing analysis package, EnRad Analytical Laboratory immediately suspended the LLI-131 in Water analysis and samples requiring this analysis were sent to a vendor lab (GEL) for analysis. Due to the second non-agreement, another evaluation was conducted to determine the cause and how to prevent recurrence. The evaluation identified the following items to help prevent recurrence: (1) revise EnRad procedure # 54 to specify method (pH) limitations of steps and to apply dechlorination steps only when needed; (2) revise EnRad procedure # 515 to address specific activity ranges, chemical matrix types, physical matrix types, or specific geometry requirements -

such as I-131 cross check samples be ordered at a lower pH; (3) analyze a final set of test samples in appropriate pH to validate cause had been resolved. All FSS LLI-131 samples analyzed during fourth quarter 2015 were in agreement.

Low-Level Iodine 131 (LLI-131) activity has not been observed in water analyses at EnRad Analytical Laboratory in 2015; therefore, there is no possibility that I-131 results may have been underreported in 2015. During first quarter of 2015, EnRad Analytical Laboratory analyzed a LLI-131 in Milk (E11171) with acceptable results (Ratio: 99%). LLI-131 in Milk methodology is essentially the same as that of water and they have similar densities.

Section 5 - Page 3

5.5.3 ERA PROFICIENCY TESTING EnRad Laboratories performed method proficiency testing through a program administered by Environmental Resource Associates (ERA) of Arvada, CO. ERA supplied requested method proficiency samples for analysis and nuclide concentration determination. ERA reported proficiency test results to the North Carolina Department of Health and Human Services, North Carolina Public Health Drinking Water Laboratory Certification Program. A summary of these proficiency test data for 2015 is documented in Table 5.0-C.

5.6 INTERCOMPARISON PROGRAM Oconee Nuclear Station routinely participates in an environmental sample intercomparison program. Program elements include sampling frequency and analysis parameters 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 analysis.

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 unknown estimated delivered exposure. A summary of the 2015 Nuclear Technology Services Intercomparison Report is documented in Table 5.0-D. 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. During third quarter of 2015 an environmental external TLD cross check failed and NCR # 02012855 was written to document this failure. To prevent recurrence, the TLD was pulled and visually inspected for cracks in the elements and overall integrity of the TLD - no abnormalities were found. A dose response check was performed and one of the elements fell outside the acceptable limits; therefore, the TLD was removed from service by separating it from the usable TLD population and writing OOS (out of service) over the barcode with a permanent marker to prevent future use. Fourth quarter 2015 results were all acceptable. Complete documentation of any evaluation will be available and provided to the NRC upon request.

5.7.2 INTERNAL CROSS CHECK (DUKE ENERGY)

Radiation Dosimetry and Records participates in a quarterly TLD intracomparison 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 2015 Internal Cross Check (Duke Energy) Program is documented in Table 5.0-D.

Section 5 - Page 4

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 2015. A summary of the GEL quality assurance program results for the sample media types sent to GEL during 2015 is documented in Table 5.0-E. GEL Quality Assurance Program results not appearing in Table 5.0-E will be supplied upon request.

Section 5 - Page 5

TABLE 5.0-A DUKE ENERGY INTERLABORATORY COMPARISON PROGRAM 2015 EnRad Fleet Scientific Services Cross Check Performance Summary Cross check samples were distributed by Fleet Scientific Services (FSS) in accordance with Duke Energy Nuclear Generation Procedure SRPMP 9-2. Thirteen water samples were analyzed for tritium, gross beta, and mixed gamma emitters, while two water samples were analyzed for low-level I-131. The below table lists results for specific analyses.

One hundred and twenty results were reported and evaluated as prescribed in procedure SRPMP 9-2. The acceptance criteria for the program was based on the NRC Inspection Manual Procedure 84750 (IP 84750). These results passed the acceptance criteria for the program with 100% agreement.

EnRad EnRad/GO Sample Sample ID Nuclide Quarter Units GO Value Evaluation Value Ratio Water 4 pCi/L 1.13E+02 1.17E+02 0.96 Agreement LLI-131 Q154L1W1 I-131 4 pCi/L 1.19E+02 1.17E+02 1.01 Agreement 4 pCi/L 1.19E+02 1.17E+02 1.01 Agreement 4 pCi/L 5.57E+01 5.71E+01 0.97 Agreement Q154L1W2 I-131 4 pCi/L 5.51E+01 5.71E+01 0.96 Agreement 4 pCi/L 5.41E+01 5.71E+01 0.95 Agreement Tritium in 1 pCi/L 2.22E+03 2.08E+03 1.07 Agreement Q151TWR1 H-3 Water 1 pCi/L 2.14E+03 2.08E+03 1.03 Agreement 1 pCi/L 4.74E+02 4.42E+02 1.07 Agreement Q151TWR2 H-3 1 pCi/L 5.20E+02 4.42E+02 1.18 Agreement 1 pCi/L 8.35E+03 8.45E+03 0.99 Agreement Q151TWR3 H-3 1 pCi/L 8.44E+03 8.45E+03 1.00 Agreement Tritium in 3 pCi/L 1.45E+05 1.49E+05 0.97 Agreement Water Q153TWR1 H-3 3 pCi/L 1.47E+05 1.49E+05 0.99 Agreement 3 pCi/L 1.49E+05 1.49E+05 1.00 Agreement 3 pCi/L 2.82E+03 2.77E+03 1.02 Agreement Q153TWR2 H-3 3 pCi/L 2.79E+03 2.77E+03 1.01 Agreement 3 pCi/L 2.69E+03 2.77E+03 0.97 Agreement 3 pCi/L 3.70E+02 3.35E+02 1.11 Agreement Q153TWR3 H-3 3 pCi/L 3.34E+02 3.35E+02 1.00 Agreement 3 pCi/L 3.20E+02 3.35E+02 0.96 Agreement Beta in 3 pCi/L 1.31E+02 1.27E+02 1.03 Agreement Water Q153ABW1 Cs-137 3 pCi/L 1.29E+02 1.27E+02 1.02 Agreement 3 pCi/L 1.28E+02 1.27E+02 1.01 Agreement 3 pCi/L 3.24E+02 3.26E+02 0.99 Agreement Q153ABW2 Cs-137 3 pCi/L 3.32E+02 3.26E+02 1.02 Agreement 3 pCi/L 3.24E+02 3.26E+02 0.99 Agreement 3 pCi/L 2.04E+02 1.97E+02 1.04 Agreement Q153ABW3 Cs-137 3 pCi/L 2.05E+02 1.97E+02 1.04 Agreement 3 pCi/L 2.03E+02 1.97E+02 1.03 Agreement Section 5 - Page 6

TABLE 5.0-A (Cont.)

EnRad GO EnRad/GO Sample Sample ID Nuclide Quarter Units Evaluation Value Value Ratio Gamma Q151GWR1 Mn-54 1 pCi/L 7.06E+03 6.65E+03 1.06 Agreement in 1.0 L 1 pCi/L 7.18E+03 6.65E+03 1.08 Agreement Water 1 pCi/L 7.16E+03 6.65E+03 1.08 Agreement Co-57 1 pCi/L 4.84E+03 4.87E+03 0.99 Agreement 1 pCi/L 4.93E+03 4.87E+03 1.01 Agreement 1 pCi/L 4.88E+03 4.87E+03 1.00 Agreement Fe-59 1 pCi/L 7.92E+03 7.41E+03 1.07 Agreement 1 pCi/L 8.06E+03 7.41E+03 1.09 Agreement 1 pCi/L 8.10E+03 7.41E+03 1.09 Agreement Co-60 1 pCi/L 6.13E+03 6.14E+03 1.00 Agreement 1 pCi/L 6.25E+03 6.14E+03 1.02 Agreement 1 pCi/L 6.21E+03 6.14E+03 1.01 Agreement Cs-134 1 pCi/L 7.53E+03 8.53E+03 0.88 Agreement 1 pCi/L 7.59E+03 8.53E+03 0.89 Agreement 1 pCi/L 7.59E+03 8.53E+03 0.89 Agreement Cs-137 1 pCi/L 1.34E+04 1.32E+04 1.02 Agreement 1 pCi/L 1.37E+04 1.32E+04 1.04 Agreement 1 pCi/L 1.37E+04 1.32E+04 1.04 Agreement Q151GWR1 Mn-54 1 pCi/L 7.38E+03 6.65E+03 1.11 Agreement 3.5 L 1 pCi/L 7.32E+03 6.65E+03 1.10 Agreement 1 pCi/L 7.40E+03 6.65E+03 1.11 Agreement Co-57 1 pCi/L 5.14E+03 4.87E+03 1.05 Agreement 1 pCi/L 5.01E+03 4.87E+03 1.03 Agreement 1 pCi/L 5.17E+03 4.87E+03 1.06 Agreement Fe-59 1 pCi/L 8.12E+03 7.41E+03 1.10 Agreement 1 pCi/L 8.15E+03 7.41E+03 1.10 Agreement 1 pCi/L 8.12E+03 7.41E+03 1.10 Agreement Co-60 1 pCi/L 6.41E+03 6.14E+03 1.04 Agreement 1 pCi/L 6.42E+03 6.14E+03 1.05 Agreement 1 pCi/L 6.41E+03 6.14E+03 1.04 Agreement Cs-134 1 pCi/L 8.09E+03 8.53E+03 0.95 Agreement 1 pCi/L 8.01E+03 8.53E+03 0.94 Agreement 1 pCi/L 8.15E+03 8.53E+03 0.96 Agreement Cs-137 1 pCi/L 1.42E+04 1.32E+04 1.08 Agreement 1 pCi/L 1.41E+04 1.32E+04 1.07 Agreement 1 pCi/L 1.42E+04 1.32E+04 1.08 Agreement Section 5 - Page 7

TABLE 5.0-A (Cont.)

EnRad EnRad/GO Sample Sample ID Nuclide Quarter Units GO Value Evaluation Value Ratio Gamma Q153GWR Mn-54 3 pCi/L 8.38E+03 7.79E+03 1.08 Agreement in 1.0 L 3 pCi/L 8.43E+03 7.79E+03 1.08 Agreement Water 3 pCi/L 8.48E+03 7.79E+03 1.09 Agreement Co-57 3 pCi/L 1.05E+04 1.05E+04 1.00 Agreement 3 pCi/L 1.06E+04 1.05E+04 1.01 Agreement 3 pCi/L 1.06E+04 1.05E+04 1.01 Agreement Fe-59 3 pCi/L 2.65E+04 2.40E+04 1.10 Agreement 3 pCi/L 2.69E+04 2.40E+04 1.12 Agreement 3 pCi/L 2.69E+04 2.40E+04 1.12 Agreement Co-60 3 pCi/L 1.24E+04 1.22E+04 1.02 Agreement 3 pCi/L 1.25E+04 1.22E+04 1.02 Agreement 3 pCi/L 1.26E+04 1.22E+04 1.03 Agreement Zn-65 3 pCi/L 1.89E+04 1.74E+04 1.09 Agreement 3 pCi/L 1.91E+04 1.74E+04 1.10 Agreement 3 pCi/L 1.92E+04 1.74E+04 1.10 Agreement Y-88 3 pCi/L 8.62E+03 8.86E+03 0.97 Agreement 3 pCi/L 8.81E+03 8.86E+03 0.99 Agreement 3 pCi/L 8.89E+03 8.86E+03 1.00 Agreement Sn-113 3 pCi/L 1.35E+04 1.31E+04 1.03 Agreement 3 pCi/L 1.36E+04 1.31E+04 1.04 Agreement 3 pCi/L 1.34E+04 1.31E+04 1.03 Agreement Cs-134 3 pCi/L 6.29E+03 6.91E+03 0.91 Agreement 3 pCi/L 6.29E+03 6.91E+03 0.91 Agreement 3 pCi/L 6.37E+03 6.91E+03 0.92 Agreement Cs-137 3 pCi/L 1.22E+04 1.17E+04 1.05 Agreement 3 pCi/L 1.22E+04 1.17E+04 1.05 Agreement 3 pCi/L 1.22E+04 1.17E+04 1.05 Agreement Section 5 - Page 8

TABLE 5.0-A (Cont.)

EnRad EnRad/GO Sample Sample ID Nuclide Quarter Units GO Value Evaluation Value Ratio Gamma Mn-54 3 pCi/L 8.47E+03 7.79E+03 1.09 Agreement in Q153GWR 3 pCi/L 8.56E+03 7.79E+03 1.10 Agreement Water 3.5 L 3 pCi/L 8.47E+03 7.79E+03 1.09 Agreement Co-57 3 pCi/L 1.07E+04 1.05E+04 1.02 Agreement 3 pCi/L 1.09E+04 1.05E+04 1.04 Agreement 3 pCi/L 1.07E+04 1.05E+04 1.02 Agreement Fe-59 3 pCi/L 2.66E+04 2.40E+04 1.11 Agreement 3 pCi/L 2.67E+04 2.40E+04 1.11 Agreement 3 pCi/L 2.66E+04 2.40E+04 1.11 Agreement Co-60 3 pCi/L 1.27E+04 1.22E+04 1.04 Agreement 3 pCi/L 1.28E+04 1.22E+04 1.05 Agreement 3 pCi/L 1.27E+04 1.22E+04 1.04 Agreement Zn-65 3 pCi/L 1.90E+04 1.74E+04 1.09 Agreement 3 pCi/L 1.92E+04 1.74E+04 1.10 Agreement 3 pCi/L 1.90E+04 1.74E+04 1.09 Agreement Y-88 3 pCi/L 8.93E+03 8.86E+03 1.01 Agreement 3 pCi/L 8.96E+03 8.86E+03 1.01 Agreement 3 pCi/L 9.00E+03 8.86E+03 1.02 Agreement Sn-113 3 pCi/L 1.38E+04 1.31E+04 1.06 Agreement 3 pCi/L 1.40E+04 1.31E+04 1.07 Agreement 3 pCi/L 1.38E+04 1.31E+04 1.06 Agreement Cs-134 3 pCi/L 6.53E+03 6.91E+03 0.94 Agreement 3 pCi/L 6.58E+03 6.91E+03 0.95 Agreement 3 pCi/L 6.55E+03 6.91E+03 0.95 Agreement Cs-137 3 pCi/L 1.23E+04 1.17E+04 1.05 Agreement 3 pCi/L 1.24E+04 1.17E+04 1.06 Agreement 3 pCi/L 1.23E+04 1.17E+04 1.05 Agreement Section 5 - Page 9

TABLE 5.0-B ECKERT & ZIEGLER ANALYTICS CROSS CHECK PROGRAM 2015 Cross Check Results for EnRad Laboratories Interlaboratory Cross check samples are received, prepared, and analyzed in all four quarters of 2015. 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). Seventy-three environmental results were reported, of which 70 (95.9%) met the acceptance criteria based on IP 84750.

EnRad/

Sample Sample Nuclide Quarter Units EnRad EZA Evaluation EZA ID Value Value Ratio Gamma E11279 Ce-141 3 pCi 87.6 84.9 1.03 Agreement in Cr-51 3 pCi 218 215 1.02 Agreement Filter Cs-134 3 pCi 83.6 84.4 0.99 Agreement Cs-137 3 pCi 102 102 1.00 Agreement Co-58 3 pCi 108 105 1.03 Agreement Mn-54 3 pCi 113 116 0.98 Agreement Fe-59 3 pCi 93 89.9 1.03 Agreement Zn-65 3 pCi 141 141 1.00 Agreement Co-60 3 pCi 133 132 1.01 Agreement Section 5 - Page 10

TABLE 5.0-B (Cont.)

EnRad/

Sample Sample Nuclide Quarter Units EnRad EZA Evaluation EZA ID Value Value Ratio Gross E11281 3 pCi 205 216 0.95 Agreement Gross Beta Beta Filter Gross E11411 4 pCi 256 240 1.07 Agreement Beta Gross Beta E11249 Cs-137 2 pCi/L 259 248 1.04 Agreement in Water E11407 Cs-137 4 pCi/L 242 247 0.98 Agreement I-131 E11172 I-131 1 pCi 82.0 78.4 1.05 Agreement Charcoal Cartridge E11278 I-131 3 pCi 81.5 81.4 1.00 Agreement LLI-131 in E11248 I-131 2 pCi/L 67.8 98.4 0.69 Non-Agreement*

Water E11337 I-131 3 pCi/L 58.5 96.5 0.61 Non-Agreement**

LLI-131 in E11171 I-131 1 pCi/L 98.3 99.0 0.99 Agreement Milk Tritium in E11252 H-3 2 pCi/L 13,100 13,000 1.01 Agreement Water Gamma in E11250 Cr-51 2 pCi/g 0.430 0.474 0.91 Agreement Vegetation Cs-134 2 pCi/g 0.230 0.279 0.82 Agreement (Coffee Cs-137 2 pCi/g 0.170 0.215 0.79 Non-Agreement***

Grounds)

Co-58 2 pCi/g 0.100 0.117 0.85 Agreement Mn-54 2 pCi/g 0.150 0.173 0.87 Agreement Fe-59 2 pCi/g 0.260 0.260 1.00 Agreement Zn-65 2 pCi/g 0.400 0.427 0.94 Agreement Co-60 2 pCi/g 0.300 0.331 0.91 Agreement Gamma in E11335 Ce-141 3 pCi/g 0.307 0.312 0.98 Agreement Vegetation Cr-51 3 pCi/g 0.819 0.788 1.04 Agreement (Coffee Cs-134 3 pCi/g 0.272 0.310 0.88 Agreement Grounds)

Cs-137 3 pCi/g 0.383 0.373 1.03 Agreement Co-58 3 pCi/g 0.389 0.385 1.01 Agreement Mn-54 3 pCi/g 0.449 0.425 1.06 Agreement Fe-59 3 pCi/g 0.361 0.331 1.09 Agreement Zn-65 3 pCi/g 0.561 0.517 1.08 Agreement Co-60 3 pCi/g 0.493 0.483 1.02 Agreement

NCR # 01937710

- NCR # 01967544

- - NCR # 01939292 Section 5 - Page 11

TABLE 5.0-B (Cont.)

EnRad/

Sample Sample Nuclide Quarter Units EnRad EZA Evaluation EZA ID Value Value Ratio Gamma in E11280 Ce-141 3 pCi 141 140 1.01 Agreement Composite Cr-51 3 pCi 370 353 1.05 Agreement Filter Cs-134 3 pCi 136 139 0.98 Agreement Cs-137 3 pCi 164 167 0.98 Agreement Co-58 3 pCi 167 172 0.97 Agreement Mn-54 3 pCi 195 190 1.03 Agreement Fe-59 3 pCi 179 148 1.21 Agreement Zn-65 3 pCi 224 232 0.97 Agreement Co-60 3 pCi 213 216 0.99 Agreement Gamma in E11282 I-131 3 pCi/L 94.6 96.7 0.98 Agreement Water Ce-141 3 pCi/L 196 199 0.99 Agreement Cr-51 3 pCi/L 508 502 1.01 Agreement Cs-134 3 pCi/L 176 198 0.89 Agreement Cs-137 3 pCi/L 237 238 1.00 Agreement Co-58 3 pCi/L 240 246 0.98 Agreement Mn-54 3 pCi/L 286 271 1.06 Agreement Fe-59 3 pCi/L 229 211 1.09 Agreement Zn-65 3 pCi/L 353 330 1.07 Agreement Co-60 3 pCi/L 314 308 1.02 Agreement Gamma in E11170 I-131 1 pCi/L 97.9 97.5 1.00 Agreement Milk Ce-141 1 pCi/L 221 211 1.05 Agreement Cr-51 1 pCi/L 607 555 1.09 Agreement Cs-134 1 pCi/L 181 191 0.95 Agreement Cs-137 1 pCi/L 266 253 1.05 Agreement Co-58 1 pCi/L 285 272 1.05 Agreement Mn-54 1 pCi/L 262 240 1.09 Agreement Fe-59 1 pCi/L 334 295 1.13 Agreement Zn-65 1 pCi/L 509 453 1.12 Agreement Co-60 1 pCi/L 527 498 1.06 Agreement Gamma in E11251 Cr-51 2 pCi/g 0.460 0.482 0.95 Agreement Soil Cs-134 2 pCi/g 0.260 0.284 0.91 Agreement Cs-137 2 pCi/g 0.270 0.298 0.91 Agreement Co-58 2 pCi/g 0.110 0.119 0.92 Agreement Mn-54 2 pCi/g 0.170 0.176 0.97 Agreement Fe-59 2 pCi/g 0.260 0.264 0.98 Agreement Zn-65 2 pCi/g 0.430 0.434 0.99 Agreement Co-60 2 pCi/g 0.300 0.336 0.89 Agreement Section 5 - Page 12

TABLE 5.0-C ENVIRONMENTAL RESOURCE ASSOCIATES (ERA)

PROFICIENCY TESTING 2015 Proficiency Test Results for EnRad Laboratories North Carolina Department of Health and Human Services Laboratory Certification EnRad Laboratories Proficiency test samples are received, prepared, and analyzed in second and fourth quarters of 2015. Results are reported directly to Environmental Resource Associates as described in the instruction package within the study period. Proficiency test data are reported to ERA for evaluation. The acceptance criteria for the program was based on the National Environmental Laboratory Accreditation Conference (NELAC) Field of Proficiency Testing criteria. Fourteen results were reported of which 14 (100 %) met the acceptance criteria. ERA reports proficiency test results to the North Carolina Department of Health and Human Services, North Carolina Public Drinking Water Laboratory Certification Program. This testing is to satisfy the North Carolina state drinking water radiochemistry certification requirements.

EnRad ERA Acceptance Sample Sample ID Nuclide Quarter Units Evaluation Value Value Limits Gamma Rad-101 Ba-133 2 pCi/L 75.5 82.5 69.3 - 90.8 Agreement Emitters in Cs-134 2 pCi/L 69.0 75.7 61.8-83.3 Agreement Water Cs-137 2 pCi/L 188.0 189.0 170 - 210 Agreement Co-60 2 pCi/L 81.1 84.5 76.0 - 95.3 Agreement Zn-65 2 pCi/L 219.0 203.0 183 - 238 Agreement Gamma Rad -103 Ba-133 4 pCi/L 29.6 32.5 25.9 - 36.7 Agreement Emitters in Cs-134 4 pCi/L 54.0 62.3 50.6 - 68.5 Agreement Water Cs-137 4 pCi/L 160 157 141 -175 Agreement Co-60 4 pCi/L 71.2 71.1 64.0 - 80.7 Agreement Zn-65 4 pCi/L 141 126 113 -149 Agreement Tritium in Rad -101 H-3 2 pCi/L 3180 3280 2770-3620 Agreement 18700-Water Rad -103 H-3 4 pCi/L 20600 21300 Agreement 23400 Iodine-131 Rad -101 I-131 2 pCi/L 23.3 23.8 19.7 - 28.3 Agreement in Water Rad -103 I-131 4 pCi/L 25.4 26.3 21.9 - 31.0 Agreement Section 5 - Page 13

TABLE 5.0-D 2015 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 Technology Services irradiates environmental dosimeters quarterly and sends them to the 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. Complete documentation of any evaluation will be available and provided to the NRC upon request.

1st Quarter 2015 2nd Quarter 2015 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 102480 75.35 70.21 7.32 <+/-15% Pass 102723 18.37 21.52 -14.64 <+/-15% Pass 102376 72.44 70.21 3.18 <+/-15% Pass 103394 19.49 21.52 -9.43 <+/-15% Pass 102444 73.21 70.21 4.27 <+/-15% Pass 103058 19.49 21.52 -9.43 <+/-15% Pass 103070 78.11 70.21 11.25 <+/-15% Pass 103120 19.83 21.52 -7.85 <+/-15% Pass 102008 77.96 70.21 11.04 <+/-15% Pass 103419 19.34 21.52 -10.13 <+/-15% Pass Average Bias (B) 7.41 Average Bias (B) -10.30 Standard Deviation (S) 3.73 Standard Deviation (S) 2.57 Measure Performance lBl+S 11.14 <15% Pass Measure Performance lBl+S 12.86 <15% Pass 3rd Quarter 2015 4th Quarter 2015 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 103243 20.29 18.7 8.68 <+/-15% Pass 102869 72.88 66.9 8.91 <+/-15% Pass 103294 20.64 18.7 10.55 <+/-15% Pass 102239 71.35 66.9 6.62 <+/-15% Pass 100502 19.30 18.7 3.37 <+/-15% Pass 101338 72.24 66.9 7.95 <+/-15% Pass 100025 19.51 18.7 4.50 <+/-15% Pass 100372 69.80 66.9 4.30 <+/-15% Pass 102816 21.91 18.7 17.35 <+/-15% Fail 100357 70.90 66.9 5.95 <+/-15% Pass Average Bias (B) 8.89 Average Bias (B) 6.75 Standard Deviation (S) 5.57 Standard Deviation (S) 1.78 Measure Performance lBl+S 14.46 <15% Pass Measure Performance lBl+S 8.53 <15% Pass Fail - refer to NCR # 02012855 Section 5 - Page 14

TABLE 5.0-D (Cont.)

Internal Crosscheck (Duke Energy)

Radiation Dosimetry and Records participates in a quarterly TLD intracomparison 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.

1st Quarter 2015 2nd Quarter 2015 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 103012 30.82 30.0 2.73 <+/-15% Pass 100193 22.07 21.8 1.24 <+/-15% Pass 103524 31.64 30.0 5.47 <+/-15% Pass 101191 21.06 21.8 -3.39 <+/-15% Pass 102769 32.31 30.0 7.70 <+/-15% Pass 101201 21.74 21.8 -0.28 <+/-15% Pass 103754 31.29 30.0 4.30 <+/-15% Pass 100158 21.94 21.8 0.64 <+/-15% Pass 102798 30.86 30.0 2.87 <+/-15% Pass 101319 21.99 21.8 0.87 <+/-15% Pass 103737 31.50 30.0 5.00 <+/-15% Pass 101183 22.46 21.8 3.03 <+/-15% Pass 102985 32.05 30.0 6.83 <+/-15% Pass 101330 21.40 21.8 -1.83 <+/-15% Pass 102108 29.99 30.0 -0.03 <+/-15% Pass 100351 22.36 21.8 2.57 <+/-15% Pass 102867 31.00 30.0 3.33 <+/-15% Pass 101038 22.36 21.8 2.57 <+/-15% Pass 103500 31.61 30.0 5.37 <+/-15% Pass 22.49 21.8 3.17 <+/-15% Pass Average Bias (B) 4.36 Average Bias (B) 0.86 Standard Deviation (S) 2.24 Standard Deviation (S) 2.18 Measure Performance lBl+S 6.60 <15% Pass Measure Performance lBl+S 3.04 <15% Pass 3rd Quarter 2015 4th Quarter 2015 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 103703 48.64 43.6 11.56 <+/-15% Pass 100057 55.76 54.5 2.31 <+/-15% Pass 102917 46.91 43.6 7.59 <+/-15% Pass 103022 62.04 54.5 13.83 <+/-15% Pass 100170 44.30 43.6 1.61 <+/-15% Pass 103254 55.74 54.5 2.28 <+/-15% Pass 102841 46.18 43.6 5.92 <+/-15% Pass 100154 60.56 54.5 11.12 <+/-15% Pass 101149 43.63 43.6 0.07 <+/-15% Pass 103256 55.71 54.5 2.22 <+/-15% Pass 102474 44.87 43.6 2.91 <+/-15% Pass 101225 58.10 54.5 6.61 <+/-15% Pass 100522 46.11 43.6 5.76 <+/-15% Pass 100799 59.79 54.5 9.71 <+/-15% Pass 103016 48.70 43.6 11.70 <+/-15% Pass 100417 61.06 54.5 12.04 <+/-15% Pass 100095 46.11 43.6 5.76 <+/-15% Pass 103683 57.37 54.5 5.27 <+/-15% Pass 100381 42.87 43.6 -1.67 <+/-15% Pass 102114 55.74 54.5 2.28 <+/-15% Pass Average Bias (B) 5.12 Average Bias (B) 6.77 Standard Deviation (S) 4.49 Standard Deviation (S) 4.58 Measure Performance lBl+S 9.61 <15% Pass Measure Performance lBl+S 11.34 <15% Pass Section 5 - Page 15

TABLE 5.0-E 2015 ANNUAL QUALITY ASSURANCE REPORT for the RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM for GEL Laboratories, LLC (GEL)

GEL Known Acceptance Sample Nuclide Quarter Units Evaluation Value Value Range/Ratio HDT in Soil Agreement Fe-55 2nd Bq/Kg 330 205 Sens. Eval.

MAPEP-15-MaS32 Agreement th Bq/kg 557 555 389 - 722 Agreement (2Q 2015) 4 Sr-90 nd Bq/Kg 601.00 653 457 - 849 Agreement MAPEP-15-MaS33 2 (4Q 2015) 4 th Bq/kg 403 425 298 - 553 Agreement Gamma in Soil Am-241 nd Bq/Kg 97.0 68.0 68 - 126 Agreement 2

th Bq/Kg 61.7 49.5 34.7 - 64.4 Warning 4

Co-57 nd Bq/Kg 0.369 --- False Pos Test Agreement 2

th Bq/Kg 1240.0 1180 826 - 1534 Agreement 4

Cs-134 nd Bq/Kg 639 678 475 - 881 Agreement MAPEP-15-MaS32 2 th Bq/Kg 933 1010 707 - 1313 Agreement (2Q 2015) 4 Cs-137 2nd Bq/Kg -0.279 False Pos Test Agreement 4th Bq/Kg 861.00 809 566 - 1052 Agreement Mn-54 2nd Bq/Kg 1280 1198 839 - 1557 Agreement MAPEP-15-MaS33 4th Bq/Kg 1450 1340 938 - 1742 Agreement (4Q 2015) Zn-65 2nd Bq/Kg 1190.0 1064 745 - 1383 Agreement th Bq/Kg 761.0 662 463 - 861 Agreement 4

Co-60 nd Bq/Kg 852 817 572 - 1062 Agreement 2

th Bq/Kg 2.45 1.30 Sens. Eval. Agreement 4

K-40 nd Bq/Kg 684 622 435 - 809 Agreement 2

th Bq/Kg 687 599 419 - 779 Agreement 4

Note:

HTD refers to Hard-to-detect radionuclides Section 5 - Page 16

TABLE 5.0-E (Cont.)

GEL Known Acceptance Sample Nuclide Quarter Units Evaluation Value Value Range/Ratio Gamma in Water Ce-141 4 th pCi/L 302 284 1.06 Agreement 1 st pCi/L 140 139 1.01 Agreement EZA 4Q 2014 2nd pCi/L 1.24E-01 Not Pres. --- Agreement E11060 3rd pCi/L 205 199 1.03 Agreement 4 th pCi/L 127 112 1.14 Agreement Cr-51 4 th pCi/L 543 526 1.03 Agreement 1st pCi/L 395 366 1.08 Agreement 2nd pCi/L 347 293 1.18 Agreement 3 rd pCi/L 542 502 1.08 Agreement 4th pCi/L 260 244 1.07 Agreement EZA 1Q 2015 Cs-134 4th pCi/L 190 213 0.89 Agreement E11177 1 st pCi/L 112 126 0.89 Agreement 2nd pCi/L 163 173 0.94 Agreement 3rd pCi/L 175 198 0.89 Agreement 4 th pCi/L 125 139 0.90 Agreement Cs-137 4 th pCi/L 258 257 1.01 Agreement 1 st pCi/L 169 167 1.01 Agreement EZA 2Q 2015 2nd pCi/L 134 133 1.01 Agreement E11219 3 rd pCi/L 240 238 1.01 Agreement 4 th pCi/L 112 99.5 1.13 Agreement Co-58 4th pCi/L 173 168 1.03 Agreement 1 st pCi/L 178 180 0.99 Agreement 2nd pCi/L 72.1 72.6 0.99 Agreement 3rd pCi/L 245 246 1.00 Agreement 4 th pCi/L 97.3 95.6 1.02 Agreement EZA 3Q 2015 Mn-54 4th pCi/L 306 292 1.05 Agreement E11313 1 st pCi/L 166 159 1.05 Agreement 2nd pCi/L 117 107 1.10 Agreement 3 rd pCi/L 288 271 1.06 Agreement 4 th pCi/L 141 126 1.12 Agreement Fe-59 4th pCi/L 251 226 1.11 Agreement 1 st pCi/L 214 195 1.10 Agreement 2nd pCi/L 176 161 1.09 Agreement 3rd pCi/L 231 211 1.10 Agreement 4 th pCi/L 111 93.4 1.19 Agreement EZA 4Q 2015 Zn-65 4th pCi/L 420 384 1.09 Agreement E11415 1 st pCi/L 325 299 1.09 Agreement 2nd pCi/L 285 264 1.08 Agreement 3 rd pCi/L 375 330 1.14 Agreement 4 th pCi/L 243 215 1.13 Agreement Co-60 4th pCi/L 324 304 1.06 Agreement 1 st pCi/L 323 328 0.98 Agreement 2nd pCi/L 210 205 1.03 Agreement 3rd pCi/L 311 308 1.01 Agreement 4 th pCi/L 192 185 1.04 Agreement Section 5 - Page 17

TABLE 5.0-E (Cont.)

GEL Known Acceptance Sample Nuclide Quarter Units Evaluation Value Value Range/Ratio Tritium in Water MAPEP-15-GrW32 H-3 2nd Bq/L 633 563 394 - 732 Agreement (2Q 2015)

MAPEP-15-M aW33 H-3 4th Bq/L 212 216 151 - 281 Agreement (4Q 2015)

I-131 in Water with EZA 4Q 2014 E11060 I-131 4th pCi/L 111 95.3 1.16 Agreement 1Q 2015 E11177 I-131 1st pCi/L 99.2 96.7 1.03 Agreement 2Q 2015 E11219 I-131 2nd pCi/L 95.3 93.4 1.02 Agreement 3Q 2015 E11313 I-131 3rd pCi/L 100 96.7 1.03 Agreement I-131 th pCi/L Agreement 4Q 2015 E11415 4 105 92.6 1.13 Other GEL 2015 Annual Environmental Quality Assurance Report results will be supplied upon request.

Section 5 - Page 18

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, and Fisheries and Aquatic Ecology.

Section IV of this appendix describes the environmental sampling frequencies and analysis procedures by media type.

I. CHANGE OF SAMPLING PROCEDURES Location 024 (TLD) was relocated within the east sector due to riverbank erosion, which changed the distance from 0.79 miles to 0.81 miles (NCR # 01903305).

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 quarterly by using low-level environmental liquid scintillation analysis technique on a Perkin-Elmer 2900TR liquid scintillation system or 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.

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

Appendix A - Page 2

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

III. CHANGE OF ANALYSIS PROCEDURES Gross beta analysis of air particulate filters using an un-attenuated (single point) filter specific calibration in a flat bottom planchet was implemented from second quarter 2015 forward (NCR # 01938255).

REMP air sampling heads and air particulate media were changed to standardize the vendors, sampling head, and filter size across the REMP nuclear fleet (NCR #

00726335).

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

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

Appendix A - Page 4

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

A.8 DIRECT GAMMA RADIATION (TLD)

Thermoluminescent dosimeters (TLD) were collected quarterly at forty-two locations. A gamma exposure rate was determined for each TLD. The TLDs were placed as indicated below.

An inner ring of 17 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 5/19 - 5/20/2015. Results are shown in Table 3.9. No changes were made to the sampling procedures during 2015 as a result of the 2015 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 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 2015 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.

081 (9.33 mi SE)

Air Particulate Gross Beta See Table 2.2-C 2.04E-2 (260/260) 077 2.13E-2 (52/52) 1.78E-2 (52/52) 0 (pCi/m3) 312(4) 2.09E 4.31E-2 (1.00 mi SW) 2.09E 4.31E-2 2.03E 3.76E-2 0

Gamma See Table 2.2-C All less than LLD ----- ----- All less than LLD 24 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 1.80 (20/26) 066 2.34 (10/13) 1.46 (9/13) 0 (pCi/l) 39 0.73 - 4.97 (18.9 mi SSE) 0.87 - 4.97 0.61 - 2.65 Gamma See Table 2.2-C All less than LLD ----- ----- All less than LLD 0 39 0

Tritium 325 (3/8) 066 325 (3/4) All less than LLD 2000 12 250 - 468 (18.9 mi SSE) 250 - 468 Surface Water Gamma See Table 2.2-C All less than LLD ----- ----- All less than LLD 0 (pCi/l) 26 Tritium 2000 7730 (4/4) 063.1 7730 (4/4) All less than LLD 0 8 4460 - 9900 (0.79 mi E) 4460 - 9900 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 2015 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 Fish Gamma See Table 2.2-C 060 (2.28 mi NE) 0 (pCi/kg, wet) 12 17.8 (5/8) 067 19.4 (3/4) 12.0 (1/4)

Cs-137 150 11.1 - 29.4 (4.34 mi SSE) 11.1 - 29.4 12.0 - 12.0 Sediments--Shoreline Gamma See Table 2.2-C 0 All less than LLD (pCi/kg, dry) 6 19.5 (2/4) 063 22.4 (1/2)

Cs-137 180 16.5 - 22.4 (0.80 mi ESE) 22.4 - 22.4 058 (9.39 mi WSW)

TLD TLD Readout 21.6 (160/160) 27.4 (4/4) 081 (9.33 mi SE) 0

040 27.5 (8/8)

(mR per quarter) (5) 168(4) 14.1 - 35.2 24.4 - 30.3 (4.74 mi E) 21.9 - 33.0 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).

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 PO Power Outage FZ Sample Frozen PS Pump out of service / Undergoing Repair IW Inclement Weather SL Sample Loss/Lost due to Lab Accident LC Line Clog to Sampler SM Motor / Rotor Seized OT Other TF Torn Filter PI Power Interrupt VN Vandalism PM Preventive Maintenance CN Construction 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 99.7% availability in 2015.

Scheduled Collection Description & Corrective Location Dates Code Action to Prevent Recurrence Action 1.44 hours5.092593e-4 days 0.0122 hours 7.275132e-5 weeks 1.6742e-5 months downtime due to a power interruption to 079 2/9/15 - 2/16/15 PI sampling equipment. NCR # 01589975 9.87 hours0.00101 days 0.0242 hours 1.438492e-4 weeks 3.31035e-5 months downtime due to a power interruption to 085 2/9/15 - 2/16/15 PI sampling equipment. NCR # 01589980 085 2/16/15 - 2/23/15 PI 10.9 hours1.041667e-4 days 0.0025 hours 1.488095e-5 weeks 3.4245e-6 months downtime due to ice storm. NCR # 01589987 078.1 6/22/15 - 6/29/15 PO 59.2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months downtime due to severe thunderstorm. NCR # 01935364 079 6/22/15 - 6/29/15 PO 61.3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months downtime due to severe thunderstorm. NCR # 01935367 077 8/10/15 - 8/17/15 PI 1.90 hours0.00104 days 0.025 hours 1.488095e-4 weeks 3.4245e-5 months downtime due to severe thunderstorm. NCR # 01947222 078.1 8/10/15 - 8/17/15 PI 1.93 hours0.00108 days 0.0258 hours 1.537698e-4 weeks 3.53865e-5 months downtime due to severe thunderstorm. NCR # 01947224 077 9/28/15 - 10/5/15 PI 5.95 hours0.0011 days 0.0264 hours 1.570767e-4 weeks 3.61475e-5 months downtime due to severe thunderstorm. NCR # 01962196 078.1 9/28/15 - 10/5/15 PI 5.94 hours0.00109 days 0.0261 hours 1.554233e-4 weeks 3.5767e-5 months downtime due to severe thunderstorm. NCR # 01962202 079 10/5/15 - 10/12/15 PI 1.83 hours9.606481e-4 days 0.0231 hours 1.372354e-4 weeks 3.15815e-5 months downtime due to severe thunderstorm. NCR # 01966014 2.71 hours8.217593e-4 days 0.0197 hours 1.173942e-4 weeks 2.70155e-5 months downtime due to a power interruption to 085 11/16/15 - 11/23/15 PI sampling equipment. NCR # 01979530 Appendix C - Page 2

Surface Water REMP monthly surface water samples (Surface Water (SW)) or drinking water samples (Drinking Water (DW)) 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 water samplers operated for a total of 98.0% availability in 2015.

Scheduled Description & Corrective Location Collection Dates Code Action to Prevent Recurrence Action Reservoir pump malfunctioned and out of service.

Downtime of 150 hours0.00174 days 0.0417 hours 2.480159e-4 weeks 5.7075e-5 months incurred during composite period 5/26/2015 - 6/22/2015. The reservoir pump was returned to service effective 6/29/2015. Downtime of 5/26/15 - 6/22/15 166.4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months was incurred during composite period NCR # 01933406 062 6/22/15 - 7/20/15 PS 6/22/2015 - 7/20/2015. NCR # 01937975 C.2 UNAVAILABLE ANALYSES There were no unavailable analyses during 2015.

Appendix C - Page 3

APPENDIX D ANALYTICAL DEVIATIONS No Analytical deviations were incurred for the 2015 Radiological Environmental Monitoring Program Appendix D - Page 1

APPENDIX E RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM RESULTS 2015 This appendix includes sample analysis report summaries and supportive data generated from each sample medium for 2015.

Appendix E - Page 1

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 364932 Sample Dates: 12/29/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.25E-02 2.80E-03 2.66E-03 Sample ID: 365128 Sample Dates: 1/5/2015 - 1/12/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.75E-02 3.06E-03 2.69E-03 Sample ID: 365355 Sample Dates: 1/12/2015 - 1/19/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.92E-02 2.66E-03 2.68E-03 Sample ID: 366699 Sample Dates: 1/19/2015 - 1/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.94E-02 2.68E-03 2.63E-03 Sample ID: 367114 Sample Dates: 1/26/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.45E-02 2.42E-03 2.69E-03 Sample ID: 367607 Sample Dates: 2/2/2015 - 2/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.44E-02 2.94E-03 2.69E-03 Sample ID: 369028 Sample Dates: 2/9/2015 - 2/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.00E-02 2.71E-03 2.71E-03 Sample ID: 369740 Sample Dates: 2/16/2015 - 2/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.75E-02 3.16E-03 3.06E-03 Sample ID: 370655 Sample Dates: 2/23/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.29E-02 2.80E-03 2.62E-03 Sample ID: 371602 Sample Dates: 3/2/2015 - 3/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.72E-02 2.56E-03 2.63E-03 Sample ID: 371968 Sample Dates: 3/9/2015 - 3/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.45E-02 2.49E-03 2.84E-03 Sample ID: 372451 Sample Dates: 3/16/2015 - 3/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.85E-02 2.59E-03 2.53E-03 Sample ID: 373904 Sample Dates: 3/23/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.22E-02 2.85E-03 2.86E-03 Sample ID: 373910 Sample Dates: 12/29/2014 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <4.36E-04 0.00E+00 4.36E-04 Cs-137 <4.45E-04 0.00E+00 4.45E-04 Be-7 1.44E-01 2.22E-02 1.10E-02 K-40 8.22E-03 5.81E-03 7.33E-03 Sample ID: 374608 Sample Dates: 3/30/2015 - 4/6/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.61E-02 2.63E-03 2.94E-03 Sample ID: 374995 Sample Dates: 4/6/2015 - 4/13/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.68E-02 2.65E-03 2.91E-03 Sample ID: 375676 Sample Dates: 4/13/2015 - 4/20/2015 Nuclide Activity 2 Sigma Error MDA Beta 9.08E-03 2.20E-03 2.84E-03 Sample ID: 376883 Sample Dates: 4/20/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.91E-02 2.59E-03 2.50E-03 Sample ID: 377542 Sample Dates: 4/27/2015 - 5/4/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.56E-02 2.56E-03 2.82E-03 Sample ID: 378116 Sample Dates: 5/4/2015 - 5/11/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.75E-02 3.12E-03 2.96E-03 Sample ID: 378515 Sample Dates: 5/11/2015 - 5/18/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.66E-02 3.09E-03 2.93E-03 Sample ID: 379005 Sample Dates: 5/18/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.94E-02 2.42E-03 2.20E-03 Sample ID: 379508 Sample Dates: 5/26/2015 - 6/1/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.60E-02 2.78E-03 3.06E-03 Sample ID: 380255 Sample Dates: 6/1/2015 - 6/8/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.60E-02 2.60E-03 2.91E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 2 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 380529 Sample Dates: 6/8/2015 - 6/15/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.29E-02 2.84E-03 2.67E-03 Sample ID: 380855 Sample Dates: 6/15/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.43E-02 2.90E-03 2.67E-03 Sample ID: 381316 Sample Dates: 6/22/2015 - 6/29/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.34E-02 2.90E-03 2.74E-03 Sample ID: 381322 Sample Dates: 3/30/2015 - 6/29/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <4.64E-04 0.00E+00 4.64E-04 Cs-137 <5.58E-04 0.00E+00 5.58E-04 Be-7 1.57E-01 2.48E-02 1.26E-02 K-40 <1.03E-02 0.00E+00 1.03E-02 Sample ID: 381648 Sample Dates: 6/29/2015 - 7/6/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.81E-02 2.69E-03 2.87E-03 Sample ID: 382217 Sample Dates: 7/6/2015 - 7/13/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.89E-02 3.11E-03 2.72E-03 Sample ID: 382641 Sample Dates: 7/13/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.18E-02 2.75E-03 2.52E-03 Sample ID: 383568 Sample Dates: 7/20/2015 - 7/27/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.35E-02 2.95E-03 2.91E-03 Sample ID: 384142 Sample Dates: 7/27/2015 - 8/3/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.84E-02 3.14E-03 2.84E-03 Sample ID: 384710 Sample Dates: 8/3/2015 - 8/10/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.61E-02 2.95E-03 2.50E-03 Sample ID: 385461 Sample Dates: 8/10/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.66E-02 3.05E-03 2.83E-03 Sample ID: 385977 Sample Dates: 8/17/2015 - 8/24/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.21E-02 2.34E-03 2.75E-03 Sample ID: 386874 Sample Dates: 8/24/2015 - 8/31/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.16E-02 3.20E-03 2.59E-03 Sample ID: 387458 Sample Dates: 8/31/2015 - 9/8/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.11E-02 2.95E-03 2.30E-03 Sample ID: 388815 Sample Dates: 9/8/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.77E-02 3.05E-03 3.59E-03 Sample ID: 389457 Sample Dates: 9/14/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.18E-02 3.29E-03 2.93E-03 Sample ID: 390060 Sample Dates: 9/21/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.24E-02 2.34E-03 2.68E-03 Sample ID: 390692 Sample Dates: 6/29/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <5.68E-04 0.00E+00 5.68E-04 Cs-137 <5.24E-04 0.00E+00 5.24E-04 Be-7 1.41E-01 2.22E-02 9.83E-03 K-40 <1.26E-02 0.00E+00 1.26E-02 Sample ID: 390686 Sample Dates: 9/28/2015 - 10/5/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.09E-03 1.90E-03 3.12E-03 Sample ID: 392005 Sample Dates: 10/5/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.24E-02 2.83E-03 2.76E-03 Sample ID: 392279 Sample Dates: 10/12/2015 - 10/19/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.30E-02 2.89E-03 2.73E-03 Sample ID: 393480 Sample Dates: 10/19/2015 - 10/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.98E-02 3.17E-03 2.80E-03 Sample ID: 393878 Sample Dates: 10/26/2015 - 11/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.23E-02 2.90E-03 2.89E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 3 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 394898 Sample Dates: 11/2/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.05E-02 2.22E-03 2.69E-03 Sample ID: 395352 Sample Dates: 11/9/2015 - 11/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.59E-02 2.55E-03 2.76E-03 Sample ID: 395679 Sample Dates: 11/16/2015 - 11/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.54E-02 3.01E-03 2.82E-03 Sample ID: 396172 Sample Dates: 11/23/2015 - 11/30/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.27E-02 2.82E-03 2.63E-03 Sample ID: 396689 Sample Dates: 11/30/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.47E-02 2.96E-03 2.81E-03 Sample ID: 397234 Sample Dates: 12/7/2015 - 12/14/2015 Nuclide Activity 2 Sigma Error MDA Beta 4.31E-02 3.65E-03 2.57E-03 Sample ID: 397944 Sample Dates: 12/14/2015 - 12/21/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.89E-02 2.68E-03 2.70E-03 Sample ID: 398333 Sample Dates: 12/21/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.23E-02 2.28E-03 2.58E-03 Sample ID: 398722 Sample Dates: 9/28/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <6.58E-04 0.00E+00 6.58E-04 Cs-137 <4.72E-04 0.00E+00 4.72E-04 Be-7 1.31E-01 2.32E-02 1.54E-02 K-40 <1.16E-02 0.00E+00 1.16E-02 Sample Point 078.1 [ INDICATOR - WSW @ 0.53 miles ]

Sample ID: 364933 Sample Dates: 12/29/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.02E-02 2.70E-03 2.66E-03 Sample ID: 365129 Sample Dates: 1/5/2015 - 1/12/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.60E-02 2.99E-03 2.69E-03 Sample ID: 365356 Sample Dates: 1/12/2015 - 1/19/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.98E-02 2.69E-03 2.68E-03 Sample ID: 366700 Sample Dates: 1/19/2015 - 1/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.81E-02 2.61E-03 2.64E-03 Sample ID: 367115 Sample Dates: 1/26/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.43E-02 2.41E-03 2.69E-03 Sample ID: 367608 Sample Dates: 2/2/2015 - 2/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.12E-02 2.79E-03 2.69E-03 Sample ID: 369029 Sample Dates: 2/9/2015 - 2/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.96E-02 2.69E-03 2.71E-03 Sample ID: 369741 Sample Dates: 2/16/2015 - 2/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.54E-02 3.08E-03 3.06E-03 Sample ID: 370656 Sample Dates: 2/23/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.36E-02 2.84E-03 2.62E-03 Sample ID: 371603 Sample Dates: 3/2/2015 - 3/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.89E-02 2.65E-03 2.63E-03 Sample ID: 371969 Sample Dates: 3/9/2015 - 3/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.75E-02 2.64E-03 2.84E-03 Sample ID: 372452 Sample Dates: 3/16/2015 - 3/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.03E-02 2.67E-03 2.53E-03 Sample ID: 373905 Sample Dates: 3/23/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.84E-02 2.68E-03 2.86E-03 Sample ID: 373911 Sample Dates: 12/29/2014 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <4.49E-04 0.00E+00 4.49E-04 Cs-137 <5.01E-04 0.00E+00 5.01E-04 Be-7 1.48E-01 2.26E-02 9.84E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 4 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 373911 Sample Dates: 12/29/2014 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA K-40 <9.66E-03 0.00E+00 9.66E-03 Sample ID: 374609 Sample Dates: 3/30/2015 - 4/6/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.70E-02 2.67E-03 2.94E-03 Sample ID: 374996 Sample Dates: 4/6/2015 - 4/13/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.78E-02 2.70E-03 2.91E-03 Sample ID: 375677 Sample Dates: 4/13/2015 - 4/20/2015 Nuclide Activity 2 Sigma Error MDA Beta 9.37E-03 2.21E-03 2.83E-03 Sample ID: 376884 Sample Dates: 4/20/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.92E-02 2.60E-03 2.51E-03 Sample ID: 377543 Sample Dates: 4/27/2015 - 5/4/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.66E-02 2.61E-03 2.82E-03 Sample ID: 378117 Sample Dates: 5/4/2015 - 5/11/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.72E-02 3.11E-03 2.96E-03 Sample ID: 378516 Sample Dates: 5/11/2015 - 5/18/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.00E-02 3.23E-03 2.93E-03 Sample ID: 379006 Sample Dates: 5/18/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.74E-02 2.33E-03 2.21E-03 Sample ID: 379509 Sample Dates: 5/26/2015 - 6/1/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.37E-02 2.66E-03 3.06E-03 Sample ID: 380256 Sample Dates: 6/1/2015 - 6/8/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.72E-02 2.66E-03 2.91E-03 Sample ID: 380530 Sample Dates: 6/8/2015 - 6/15/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.87E-02 2.65E-03 2.67E-03 Sample ID: 380856 Sample Dates: 6/15/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.40E-02 2.89E-03 2.67E-03 Sample ID: 381317 Sample Dates: 6/22/2015 - 6/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.52E-02 3.98E-03 4.26E-03 Sample ID: 381323 Sample Dates: 3/30/2015 - 6/26/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <6.01E-04 0.00E+00 6.01E-04 Cs-137 <4.74E-04 0.00E+00 4.74E-04 Be-7 1.49E-01 2.34E-02 1.21E-02 K-40 <1.33E-02 0.00E+00 1.33E-02 Sample ID: 381649 Sample Dates: 6/29/2015 - 7/6/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.53E-02 2.55E-03 2.88E-03 Sample ID: 382218 Sample Dates: 7/6/2015 - 7/13/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.78E-02 3.06E-03 2.72E-03 Sample ID: 382642 Sample Dates: 7/13/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.35E-02 2.83E-03 2.52E-03 Sample ID: 383569 Sample Dates: 7/20/2015 - 7/27/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.98E-02 2.79E-03 2.91E-03 Sample ID: 384143 Sample Dates: 7/27/2015 - 8/3/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.84E-02 3.14E-03 2.84E-03 Sample ID: 384711 Sample Dates: 8/3/2015 - 8/10/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.59E-02 2.94E-03 2.50E-03 Sample ID: 385462 Sample Dates: 8/10/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.80E-02 3.11E-03 2.83E-03 Sample ID: 385978 Sample Dates: 8/17/2015 - 8/24/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.16E-02 2.31E-03 2.75E-03 Sample ID: 386875 Sample Dates: 8/24/2015 - 8/31/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.16E-02 3.20E-03 2.59E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 5 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 387459 Sample Dates: 8/31/2015 - 9/8/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.05E-02 2.93E-03 2.30E-03 Sample ID: 388816 Sample Dates: 9/8/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.91E-02 3.12E-03 3.59E-03 Sample ID: 389458 Sample Dates: 9/14/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.83E-02 3.15E-03 2.93E-03 Sample ID: 390061 Sample Dates: 9/21/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.35E-02 2.40E-03 2.68E-03 Sample ID: 390693 Sample Dates: 6/29/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <5.65E-04 0.00E+00 5.65E-04 Cs-137 <6.20E-04 0.00E+00 6.20E-04 Be-7 1.41E-01 2.35E-02 1.14E-02 K-40 <1.45E-02 0.00E+00 1.45E-02 Sample ID: 390687 Sample Dates: 9/28/2015 - 10/5/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.75E-03 1.95E-03 3.12E-03 Sample ID: 392006 Sample Dates: 10/5/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.35E-02 2.88E-03 2.76E-03 Sample ID: 392280 Sample Dates: 10/12/2015 - 10/19/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.94E-02 3.17E-03 2.73E-03 Sample ID: 393481 Sample Dates: 10/19/2015 - 10/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.40E-02 3.33E-03 2.80E-03 Sample ID: 393879 Sample Dates: 10/26/2015 - 11/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.40E-02 2.98E-03 2.89E-03 Sample ID: 394899 Sample Dates: 11/2/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.03E-02 2.21E-03 2.70E-03 Sample ID: 395353 Sample Dates: 11/9/2015 - 11/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.79E-02 2.65E-03 2.76E-03 Sample ID: 395680 Sample Dates: 11/16/2015 - 11/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.40E-02 2.95E-03 2.82E-03 Sample ID: 396173 Sample Dates: 11/23/2015 - 11/30/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.88E-02 2.64E-03 2.63E-03 Sample ID: 396690 Sample Dates: 11/30/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.25E-02 2.86E-03 2.81E-03 Sample ID: 397235 Sample Dates: 12/7/2015 - 12/14/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.61E-02 3.38E-03 2.57E-03 Sample ID: 397945 Sample Dates: 12/14/2015 - 12/21/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.93E-02 2.69E-03 2.70E-03 Sample ID: 398334 Sample Dates: 12/21/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.09E-02 2.20E-03 2.58E-03 Sample ID: 398723 Sample Dates: 9/28/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <4.44E-04 0.00E+00 4.44E-04 Cs-137 <4.91E-04 0.00E+00 4.91E-04 Be-7 1.27E-01 2.23E-02 1.43E-02 K-40 <1.11E-02 0.00E+00 1.11E-02 Sample Point 079 [ INDICATOR - NE @ 0.56 miles ]

Sample ID: 364934 Sample Dates: 12/29/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.98E-02 2.67E-03 2.66E-03 Sample ID: 365130 Sample Dates: 1/5/2015 - 1/12/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.89E-02 3.12E-03 2.69E-03 Sample ID: 365357 Sample Dates: 1/12/2015 - 1/19/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.83E-02 2.62E-03 2.68E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 6 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 366701 Sample Dates: 1/19/2015 - 1/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.54E-02 2.48E-03 2.64E-03 Sample ID: 367116 Sample Dates: 1/26/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.17E-02 2.27E-03 2.69E-03 Sample ID: 367609 Sample Dates: 2/2/2015 - 2/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.50E-02 2.97E-03 2.70E-03 Sample ID: 369030 Sample Dates: 2/9/2015 - 2/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.04E-02 2.74E-03 2.73E-03 Sample ID: 369742 Sample Dates: 2/16/2015 - 2/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.54E-02 3.08E-03 3.07E-03 Sample ID: 370657 Sample Dates: 2/23/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.36E-02 2.84E-03 2.62E-03 Sample ID: 371604 Sample Dates: 3/2/2015 - 3/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.48E-02 2.44E-03 2.62E-03 Sample ID: 371970 Sample Dates: 3/9/2015 - 3/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.36E-02 2.45E-03 2.86E-03 Sample ID: 372453 Sample Dates: 3/16/2015 - 3/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.67E-02 2.49E-03 2.53E-03 Sample ID: 373906 Sample Dates: 3/23/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.55E-02 2.53E-03 2.84E-03 Sample ID: 373912 Sample Dates: 12/29/2014 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <5.63E-04 0.00E+00 5.63E-04 Cs-137 <3.44E-04 0.00E+00 3.44E-04 Be-7 1.17E-01 1.92E-02 9.72E-03 K-40 1.07E-02 5.43E-03 1.81E-03 Sample ID: 374610 Sample Dates: 3/30/2015 - 4/6/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.32E-02 2.52E-03 3.01E-03 Sample ID: 374997 Sample Dates: 4/6/2015 - 4/13/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.80E-02 2.68E-03 2.86E-03 Sample ID: 375678 Sample Dates: 4/13/2015 - 4/20/2015 Nuclide Activity 2 Sigma Error MDA Beta 7.38E-03 2.10E-03 2.83E-03 Sample ID: 376885 Sample Dates: 4/20/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.01E-02 2.64E-03 2.50E-03 Sample ID: 377544 Sample Dates: 4/27/2015 - 5/4/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.56E-02 2.56E-03 2.83E-03 Sample ID: 378118 Sample Dates: 5/4/2015 - 5/11/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.31E-02 2.94E-03 2.96E-03 Sample ID: 378517 Sample Dates: 5/11/2015 - 5/18/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.00E-02 2.80E-03 2.93E-03 Sample ID: 379007 Sample Dates: 5/18/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.78E-02 2.34E-03 2.20E-03 Sample ID: 379510 Sample Dates: 5/26/2015 - 6/1/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.45E-02 2.71E-03 3.07E-03 Sample ID: 380257 Sample Dates: 6/1/2015 - 6/8/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.25E-02 2.42E-03 2.92E-03 Sample ID: 380531 Sample Dates: 6/8/2015 - 6/15/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.84E-02 2.64E-03 2.67E-03 Sample ID: 380857 Sample Dates: 6/15/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.11E-02 2.75E-03 2.65E-03 Sample ID: 381318 Sample Dates: 6/22/2015 - 6/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.14E-02 3.85E-03 4.37E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 7 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 381324 Sample Dates: 3/30/2015 - 6/26/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <5.96E-04 0.00E+00 5.96E-04 Cs-137 <7.11E-04 0.00E+00 7.11E-04 Be-7 1.20E-01 2.03E-02 1.20E-02 K-40 <1.11E-02 0.00E+00 1.11E-02 Sample ID: 381650 Sample Dates: 6/29/2015 - 7/6/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.49E-02 2.54E-03 2.89E-03 Sample ID: 382219 Sample Dates: 7/6/2015 - 7/13/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.63E-02 3.00E-03 2.72E-03 Sample ID: 382643 Sample Dates: 7/13/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.96E-02 2.64E-03 2.51E-03 Sample ID: 383570 Sample Dates: 7/20/2015 - 7/27/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.43E-02 2.99E-03 2.92E-03 Sample ID: 384144 Sample Dates: 7/27/2015 - 8/3/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.46E-02 2.98E-03 2.84E-03 Sample ID: 384712 Sample Dates: 8/3/2015 - 8/10/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.60E-02 2.95E-03 2.50E-03 Sample ID: 385463 Sample Dates: 8/10/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.60E-02 2.99E-03 2.79E-03 Sample ID: 385979 Sample Dates: 8/17/2015 - 8/24/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.29E-02 2.40E-03 2.76E-03 Sample ID: 386876 Sample Dates: 8/24/2015 - 8/31/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.96E-02 3.12E-03 2.59E-03 Sample ID: 387460 Sample Dates: 8/31/2015 - 9/8/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.01E-02 2.91E-03 2.30E-03 Sample ID: 388817 Sample Dates: 9/8/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.32E-02 2.81E-03 3.57E-03 Sample ID: 389459 Sample Dates: 9/14/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.80E-02 3.14E-03 2.93E-03 Sample ID: 390062 Sample Dates: 9/21/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.11E-02 2.27E-03 2.69E-03 Sample ID: 390694 Sample Dates: 6/29/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <5.98E-04 0.00E+00 5.98E-04 Cs-137 <4.71E-04 0.00E+00 4.71E-04 Be-7 1.17E-01 2.04E-02 1.14E-02 K-40 <1.04E-02 0.00E+00 1.04E-02 Sample ID: 390688 Sample Dates: 9/28/2015 - 10/5/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.93E-03 1.96E-03 3.01E-03 Sample ID: 392007 Sample Dates: 10/5/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.85E-02 2.65E-03 2.75E-03 Sample ID: 392281 Sample Dates: 10/12/2015 - 10/19/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.29E-02 2.91E-03 2.77E-03 Sample ID: 393482 Sample Dates: 10/19/2015 - 10/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.07E-02 3.20E-03 2.80E-03 Sample ID: 393880 Sample Dates: 10/26/2015 - 11/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.10E-02 2.84E-03 2.89E-03 Sample ID: 394900 Sample Dates: 11/2/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 8.44E-03 2.09E-03 2.68E-03 Sample ID: 395354 Sample Dates: 11/9/2015 - 11/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.80E-02 2.66E-03 2.77E-03 Sample ID: 395681 Sample Dates: 11/16/2015 - 11/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.20E-02 2.86E-03 2.82E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 8 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 396174 Sample Dates: 11/23/2015 - 11/30/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.87E-02 2.64E-03 2.63E-03 Sample ID: 396691 Sample Dates: 11/30/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.28E-02 2.87E-03 2.80E-03 Sample ID: 397236 Sample Dates: 12/7/2015 - 12/14/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.68E-02 3.42E-03 2.58E-03 Sample ID: 397946 Sample Dates: 12/14/2015 - 12/21/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.90E-02 2.68E-03 2.70E-03 Sample ID: 398335 Sample Dates: 12/21/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.08E-02 2.19E-03 2.57E-03 Sample ID: 398724 Sample Dates: 9/28/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <6.34E-04 0.00E+00 6.34E-04 Cs-137 <4.96E-04 0.00E+00 4.96E-04 Be-7 1.37E-01 2.36E-02 1.21E-02 K-40 4.25E-03 6.35E-03 1.06E-02 Sample Point 081 [ CONTROL - SE @ 9.33 miles ]

Sample ID: 364935 Sample Dates: 12/29/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.80E-02 2.58E-03 2.65E-03 Sample ID: 365131 Sample Dates: 1/5/2015 - 1/12/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.10E-02 2.77E-03 2.69E-03 Sample ID: 365358 Sample Dates: 1/12/2015 - 1/19/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.89E-02 2.65E-03 2.68E-03 Sample ID: 366702 Sample Dates: 1/19/2015 - 1/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.17E-02 2.27E-03 2.63E-03 Sample ID: 367117 Sample Dates: 1/26/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.44E-02 2.43E-03 2.71E-03 Sample ID: 367610 Sample Dates: 2/2/2015 - 2/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.95E-02 2.70E-03 2.68E-03 Sample ID: 369031 Sample Dates: 2/9/2015 - 2/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.73E-02 2.58E-03 2.71E-03 Sample ID: 369743 Sample Dates: 2/16/2015 - 2/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.00E-02 2.84E-03 3.05E-03 Sample ID: 370658 Sample Dates: 2/23/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.98E-02 2.67E-03 2.63E-03 Sample ID: 371605 Sample Dates: 3/2/2015 - 3/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.61E-02 2.51E-03 2.62E-03 Sample ID: 371971 Sample Dates: 3/9/2015 - 3/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.15E-02 2.33E-03 2.84E-03 Sample ID: 372454 Sample Dates: 3/16/2015 - 3/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.44E-02 2.38E-03 2.53E-03 Sample ID: 373907 Sample Dates: 3/23/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.66E-02 2.60E-03 2.86E-03 Sample ID: 373913 Sample Dates: 12/29/2014 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.27E-04 0.00E+00 1.27E-04 Cs-137 <6.45E-04 0.00E+00 6.45E-04 Be-7 1.17E-01 1.96E-02 1.17E-02 K-40 <1.11E-02 0.00E+00 1.11E-02 Sample ID: 374611 Sample Dates: 3/30/2015 - 4/6/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.30E-02 2.48E-03 2.96E-03 Sample ID: 374998 Sample Dates: 4/6/2015 - 4/13/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.63E-02 2.60E-03 2.88E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 9 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 375679 Sample Dates: 4/13/2015 - 4/20/2015 Nuclide Activity 2 Sigma Error MDA Beta 6.34E-03 2.04E-03 2.84E-03 Sample ID: 376886 Sample Dates: 4/20/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.58E-02 2.44E-03 2.51E-03 Sample ID: 377545 Sample Dates: 4/27/2015 - 5/4/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.37E-02 2.45E-03 2.81E-03 Sample ID: 378119 Sample Dates: 5/4/2015 - 5/11/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.03E-02 2.81E-03 2.96E-03 Sample ID: 378518 Sample Dates: 5/11/2015 - 5/18/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.52E-02 3.03E-03 2.94E-03 Sample ID: 379008 Sample Dates: 5/18/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.63E-02 2.27E-03 2.20E-03 Sample ID: 379511 Sample Dates: 5/26/2015 - 6/1/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.25E-02 2.60E-03 3.07E-03 Sample ID: 380258 Sample Dates: 6/1/2015 - 6/8/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.44E-02 2.51E-03 2.90E-03 Sample ID: 380532 Sample Dates: 6/8/2015 - 6/15/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.64E-02 2.54E-03 2.68E-03 Sample ID: 380858 Sample Dates: 6/15/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.94E-02 2.68E-03 2.68E-03 Sample ID: 381319 Sample Dates: 6/22/2015 - 6/29/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.99E-02 2.73E-03 2.73E-03 Sample ID: 381325 Sample Dates: 3/30/2015 - 6/29/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <5.65E-04 0.00E+00 5.65E-04 Cs-137 <4.87E-04 0.00E+00 4.87E-04 Be-7 1.22E-01 2.03E-02 1.25E-02 K-40 <1.26E-02 0.00E+00 1.26E-02 Sample ID: 381651 Sample Dates: 6/29/2015 - 7/6/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.27E-02 2.42E-03 2.88E-03 Sample ID: 382220 Sample Dates: 7/6/2015 - 7/13/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.08E-02 2.76E-03 2.72E-03 Sample ID: 382644 Sample Dates: 7/13/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.93E-02 2.63E-03 2.52E-03 Sample ID: 383571 Sample Dates: 7/20/2015 - 7/27/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.78E-02 2.69E-03 2.91E-03 Sample ID: 384145 Sample Dates: 7/27/2015 - 8/3/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.36E-02 2.93E-03 2.84E-03 Sample ID: 384713 Sample Dates: 8/3/2015 - 8/10/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.15E-02 2.74E-03 2.50E-03 Sample ID: 385464 Sample Dates: 8/10/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.19E-02 2.83E-03 2.81E-03 Sample ID: 385980 Sample Dates: 8/17/2015 - 8/24/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.02E-02 2.23E-03 2.74E-03 Sample ID: 386877 Sample Dates: 8/24/2015 - 8/31/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.12E-02 2.75E-03 2.59E-03 Sample ID: 387461 Sample Dates: 8/31/2015 - 9/8/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.42E-02 2.67E-03 2.30E-03 Sample ID: 388818 Sample Dates: 9/8/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.47E-02 2.90E-03 3.59E-03 Sample ID: 389460 Sample Dates: 9/14/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.39E-02 2.97E-03 2.94E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 10 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 390063 Sample Dates: 9/21/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.29E-02 2.36E-03 2.67E-03 Sample ID: 390695 Sample Dates: 6/29/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <5.68E-04 0.00E+00 5.68E-04 Cs-137 <3.45E-04 0.00E+00 3.45E-04 Be-7 1.23E-01 2.02E-02 8.34E-03 K-40 <1.11E-02 0.00E+00 1.11E-02 Sample ID: 390689 Sample Dates: 9/28/2015 - 10/5/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.03E-03 1.83E-03 3.01E-03 Sample ID: 392008 Sample Dates: 10/5/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.05E-02 2.75E-03 2.76E-03 Sample ID: 392282 Sample Dates: 10/12/2015 - 10/19/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.23E-02 2.85E-03 2.72E-03 Sample ID: 393483 Sample Dates: 10/19/2015 - 10/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.83E-02 3.11E-03 2.81E-03 Sample ID: 393881 Sample Dates: 10/26/2015 - 11/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.14E-02 2.86E-03 2.89E-03 Sample ID: 394901 Sample Dates: 11/2/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.07E-02 2.23E-03 2.70E-03 Sample ID: 395355 Sample Dates: 11/9/2015 - 11/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.73E-02 2.62E-03 2.77E-03 Sample ID: 395682 Sample Dates: 11/16/2015 - 11/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.33E-02 2.90E-03 2.80E-03 Sample ID: 396175 Sample Dates: 11/23/2015 - 11/30/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.07E-02 2.74E-03 2.64E-03 Sample ID: 396692 Sample Dates: 11/30/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.37E-02 2.92E-03 2.82E-03 Sample ID: 397237 Sample Dates: 12/7/2015 - 12/14/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.76E-02 3.43E-03 2.56E-03 Sample ID: 397947 Sample Dates: 12/14/2015 - 12/21/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.97E-02 2.72E-03 2.71E-03 Sample ID: 398336 Sample Dates: 12/21/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA Beta 9.53E-03 2.12E-03 2.58E-03 Sample ID: 398725 Sample Dates: 9/28/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <5.28E-04 0.00E+00 5.28E-04 Cs-137 <4.13E-04 0.00E+00 4.13E-04 Be-7 1.26E-01 2.22E-02 1.44E-02 K-40 <1.34E-02 0.00E+00 1.34E-02 Sample Point 084 [ INDICATOR - NNE @ 2.58 miles ]

Sample ID: 364936 Sample Dates: 12/29/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.76E-02 2.55E-03 2.64E-03 Sample ID: 365132 Sample Dates: 1/5/2015 - 1/12/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.89E-02 3.12E-03 2.69E-03 Sample ID: 365359 Sample Dates: 1/12/2015 - 1/19/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.95E-02 2.67E-03 2.67E-03 Sample ID: 366703 Sample Dates: 1/19/2015 - 1/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.50E-02 2.45E-03 2.64E-03 Sample ID: 367118 Sample Dates: 1/26/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.44E-02 2.42E-03 2.69E-03 Sample ID: 367611 Sample Dates: 2/2/2015 - 2/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.35E-02 2.89E-03 2.69E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 11 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 369032 Sample Dates: 2/9/2015 - 2/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.86E-02 2.65E-03 2.71E-03 Sample ID: 369744 Sample Dates: 2/16/2015 - 2/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.79E-02 3.17E-03 3.05E-03 Sample ID: 370659 Sample Dates: 2/23/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.21E-02 2.77E-03 2.62E-03 Sample ID: 371606 Sample Dates: 3/2/2015 - 3/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.76E-02 2.58E-03 2.63E-03 Sample ID: 371972 Sample Dates: 3/9/2015 - 3/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.53E-02 2.53E-03 2.84E-03 Sample ID: 372455 Sample Dates: 3/16/2015 - 3/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.83E-02 2.57E-03 2.53E-03 Sample ID: 373908 Sample Dates: 3/23/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.80E-02 2.66E-03 2.87E-03 Sample ID: 373914 Sample Dates: 12/29/2014 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <7.44E-04 0.00E+00 7.44E-04 Cs-137 <6.45E-04 0.00E+00 6.45E-04 Be-7 1.44E-01 2.28E-02 1.47E-02 K-40 <1.06E-02 0.00E+00 1.06E-02 Sample ID: 374612 Sample Dates: 3/30/2015 - 4/6/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.59E-02 2.63E-03 2.97E-03 Sample ID: 374999 Sample Dates: 4/6/2015 - 4/13/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.77E-02 2.67E-03 2.87E-03 Sample ID: 375680 Sample Dates: 4/13/2015 - 4/20/2015 Nuclide Activity 2 Sigma Error MDA Beta 6.82E-03 2.06E-03 2.84E-03 Sample ID: 376887 Sample Dates: 4/20/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.80E-02 2.54E-03 2.50E-03 Sample ID: 377546 Sample Dates: 4/27/2015 - 5/4/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.65E-02 2.60E-03 2.82E-03 Sample ID: 378120 Sample Dates: 5/4/2015 - 5/11/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.43E-02 2.99E-03 2.96E-03 Sample ID: 378519 Sample Dates: 5/11/2015 - 5/18/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.47E-02 3.01E-03 2.93E-03 Sample ID: 379009 Sample Dates: 5/18/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.71E-02 2.31E-03 2.21E-03 Sample ID: 379512 Sample Dates: 5/26/2015 - 6/1/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.28E-02 2.61E-03 3.06E-03 Sample ID: 380259 Sample Dates: 6/1/2015 - 6/8/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.67E-02 2.63E-03 2.91E-03 Sample ID: 380533 Sample Dates: 6/8/2015 - 6/15/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.03E-02 2.73E-03 2.68E-03 Sample ID: 380859 Sample Dates: 6/15/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.28E-02 2.84E-03 2.67E-03 Sample ID: 381320 Sample Dates: 6/22/2015 - 6/29/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.21E-02 2.84E-03 2.73E-03 Sample ID: 381326 Sample Dates: 3/30/2015 - 6/29/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <5.62E-04 0.00E+00 5.62E-04 Cs-137 <5.83E-04 0.00E+00 5.83E-04 Be-7 1.48E-01 2.33E-02 8.52E-03 K-40 <1.49E-02 0.00E+00 1.49E-02 Sample ID: 381652 Sample Dates: 6/29/2015 - 7/6/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.42E-02 2.50E-03 2.87E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 12 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 382221 Sample Dates: 7/6/2015 - 7/13/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.79E-02 3.07E-03 2.72E-03 Sample ID: 382645 Sample Dates: 7/13/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.16E-02 2.74E-03 2.52E-03 Sample ID: 383572 Sample Dates: 7/20/2015 - 7/27/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.12E-02 2.86E-03 2.92E-03 Sample ID: 384146 Sample Dates: 7/27/2015 - 8/3/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.61E-02 3.04E-03 2.84E-03 Sample ID: 384714 Sample Dates: 8/3/2015 - 8/10/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.38E-02 2.85E-03 2.50E-03 Sample ID: 385465 Sample Dates: 8/10/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.63E-02 3.02E-03 2.80E-03 Sample ID: 385981 Sample Dates: 8/17/2015 - 8/24/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.11E-02 2.29E-03 2.75E-03 Sample ID: 386878 Sample Dates: 8/24/2015 - 8/31/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.92E-02 3.10E-03 2.59E-03 Sample ID: 387462 Sample Dates: 8/31/2015 - 9/8/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.96E-02 2.89E-03 2.30E-03 Sample ID: 388819 Sample Dates: 9/8/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.46E-02 2.89E-03 3.59E-03 Sample ID: 389461 Sample Dates: 9/14/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.84E-02 3.16E-03 2.94E-03 Sample ID: 390064 Sample Dates: 9/21/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.19E-02 2.31E-03 2.68E-03 Sample ID: 390696 Sample Dates: 6/29/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <7.87E-04 0.00E+00 7.87E-04 Cs-137 <4.96E-04 0.00E+00 4.96E-04 Be-7 1.30E-01 2.33E-02 1.67E-02 K-40 1.08E-02 5.65E-03 1.95E-03 Sample ID: 390690 Sample Dates: 9/28/2015 - 10/5/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.20E-03 1.91E-03 3.01E-03 Sample ID: 392009 Sample Dates: 10/5/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.65E-02 2.56E-03 2.76E-03 Sample ID: 392283 Sample Dates: 10/12/2015 - 10/19/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.28E-02 2.88E-03 2.73E-03 Sample ID: 393484 Sample Dates: 10/19/2015 - 10/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.06E-02 3.20E-03 2.81E-03 Sample ID: 393882 Sample Dates: 10/26/2015 - 11/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.12E-02 2.85E-03 2.88E-03 Sample ID: 394902 Sample Dates: 11/2/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 9.00E-03 2.13E-03 2.69E-03 Sample ID: 395356 Sample Dates: 11/9/2015 - 11/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.17E-02 2.83E-03 2.77E-03 Sample ID: 395683 Sample Dates: 11/16/2015 - 11/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.83E-02 2.68E-03 2.82E-03 Sample ID: 396176 Sample Dates: 11/23/2015 - 11/30/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.98E-02 2.69E-03 2.63E-03 Sample ID: 396693 Sample Dates: 11/30/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.35E-02 2.91E-03 2.81E-03 Sample ID: 397238 Sample Dates: 12/7/2015 - 12/14/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.86E-02 3.48E-03 2.57E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 13 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 397948 Sample Dates: 12/14/2015 - 12/21/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.66E-02 2.56E-03 2.70E-03 Sample ID: 398337 Sample Dates: 12/21/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA Beta 9.39E-03 2.11E-03 2.58E-03 Sample ID: 398726 Sample Dates: 9/28/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <6.39E-04 0.00E+00 6.39E-04 Cs-137 <5.00E-04 0.00E+00 5.00E-04 Be-7 1.32E-01 2.38E-02 1.30E-02 K-40 7.53E-03 5.99E-03 8.01E-03 Sample Point 085 [ INDICATOR - NNW @ 0.88 miles ]

Sample ID: 364937 Sample Dates: 12/29/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.88E-02 2.63E-03 2.66E-03 Sample ID: 365133 Sample Dates: 1/5/2015 - 1/12/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.50E-02 2.95E-03 2.68E-03 Sample ID: 365360 Sample Dates: 1/12/2015 - 1/19/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.63E-02 2.52E-03 2.68E-03 Sample ID: 366704 Sample Dates: 1/19/2015 - 1/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.62E-02 2.52E-03 2.64E-03 Sample ID: 367119 Sample Dates: 1/26/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.04E-02 2.20E-03 2.69E-03 Sample ID: 367612 Sample Dates: 2/2/2015 - 2/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.29E-02 2.87E-03 2.69E-03 Sample ID: 369033 Sample Dates: 2/9/2015 - 2/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.26E-02 2.94E-03 2.87E-03 Sample ID: 369745 Sample Dates: 2/16/2015 - 2/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.41E-02 3.16E-03 3.27E-03 Sample ID: 370660 Sample Dates: 2/23/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.22E-02 2.77E-03 2.62E-03 Sample ID: 371607 Sample Dates: 3/2/2015 - 3/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.52E-02 2.46E-03 2.62E-03 Sample ID: 371973 Sample Dates: 3/9/2015 - 3/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.43E-02 2.48E-03 2.85E-03 Sample ID: 372456 Sample Dates: 3/16/2015 - 3/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.57E-02 2.44E-03 2.53E-03 Sample ID: 373909 Sample Dates: 3/23/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.65E-02 2.59E-03 2.86E-03 Sample ID: 373915 Sample Dates: 12/29/2014 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <6.68E-04 0.00E+00 6.68E-04 Cs-137 <3.47E-04 0.00E+00 3.47E-04 Be-7 1.29E-01 2.07E-02 1.10E-02 K-40 <1.35E-02 0.00E+00 1.35E-02 Sample ID: 374613 Sample Dates: 3/30/2015 - 4/6/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.40E-02 2.52E-03 2.95E-03 Sample ID: 375000 Sample Dates: 4/6/2015 - 4/13/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.78E-02 2.69E-03 2.90E-03 Sample ID: 375681 Sample Dates: 4/13/2015 - 4/20/2015 Nuclide Activity 2 Sigma Error MDA Beta 6.88E-03 2.06E-03 2.83E-03 Sample ID: 376888 Sample Dates: 4/20/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.01E-02 2.64E-03 2.51E-03 Sample ID: 377547 Sample Dates: 4/27/2015 - 5/4/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.66E-02 2.61E-03 2.82E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 14 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 378121 Sample Dates: 5/4/2015 - 5/11/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.43E-02 2.99E-03 2.95E-03 Sample ID: 378520 Sample Dates: 5/11/2015 - 5/18/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.59E-02 3.07E-03 2.94E-03 Sample ID: 379010 Sample Dates: 5/18/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.81E-02 2.36E-03 2.20E-03 Sample ID: 379513 Sample Dates: 5/26/2015 - 6/1/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.40E-02 2.67E-03 3.05E-03 Sample ID: 380260 Sample Dates: 6/1/2015 - 6/8/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.40E-02 2.50E-03 2.92E-03 Sample ID: 380534 Sample Dates: 6/8/2015 - 6/15/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.89E-02 2.66E-03 2.67E-03 Sample ID: 380860 Sample Dates: 6/15/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.10E-02 2.75E-03 2.67E-03 Sample ID: 381321 Sample Dates: 6/22/2015 - 6/29/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.63E-02 3.02E-03 2.72E-03 Sample ID: 381327 Sample Dates: 3/30/2015 - 6/29/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <7.04E-04 0.00E+00 7.04E-04 Cs-137 <4.75E-04 0.00E+00 4.75E-04 Be-7 1.27E-01 2.12E-02 9.33E-03 K-40 <1.15E-02 0.00E+00 1.15E-02 Sample ID: 381653 Sample Dates: 6/29/2015 - 7/6/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.38E-02 2.48E-03 2.89E-03 Sample ID: 382222 Sample Dates: 7/6/2015 - 7/13/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.62E-02 3.00E-03 2.72E-03 Sample ID: 382646 Sample Dates: 7/13/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.72E-02 2.53E-03 2.52E-03 Sample ID: 383573 Sample Dates: 7/20/2015 - 7/27/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.34E-02 2.95E-03 2.91E-03 Sample ID: 384147 Sample Dates: 7/27/2015 - 8/3/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.73E-02 3.09E-03 2.84E-03 Sample ID: 384715 Sample Dates: 8/3/2015 - 8/10/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.94E-02 3.10E-03 2.50E-03 Sample ID: 385466 Sample Dates: 8/10/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.45E-02 2.94E-03 2.80E-03 Sample ID: 385982 Sample Dates: 8/17/2015 - 8/24/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.31E-02 2.40E-03 2.75E-03 Sample ID: 386879 Sample Dates: 8/24/2015 - 8/31/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.14E-02 2.75E-03 2.59E-03 Sample ID: 387463 Sample Dates: 8/31/2015 - 9/8/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.15E-02 2.97E-03 2.30E-03 Sample ID: 388820 Sample Dates: 9/8/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.52E-02 2.92E-03 3.59E-03 Sample ID: 389462 Sample Dates: 9/14/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.26E-02 3.32E-03 2.93E-03 Sample ID: 390065 Sample Dates: 9/21/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.10E-02 2.26E-03 2.68E-03 Sample ID: 390697 Sample Dates: 6/29/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <6.87E-04 0.00E+00 6.87E-04 Cs-137 <6.88E-04 0.00E+00 6.88E-04 Be-7 1.10E-01 2.12E-02 1.61E-02 K-40 <1.45E-02 0.00E+00 1.45E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 15 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 390691 Sample Dates: 9/28/2015 - 10/5/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.36E-03 1.92E-03 3.01E-03 Sample ID: 392010 Sample Dates: 10/5/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.71E-02 2.59E-03 2.76E-03 Sample ID: 392284 Sample Dates: 10/12/2015 - 10/19/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.80E-02 3.11E-03 2.73E-03 Sample ID: 393485 Sample Dates: 10/19/2015 - 10/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.49E-02 3.37E-03 2.80E-03 Sample ID: 393883 Sample Dates: 10/26/2015 - 11/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.69E-02 3.10E-03 2.89E-03 Sample ID: 394903 Sample Dates: 11/2/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.31E-02 2.37E-03 2.70E-03 Sample ID: 395357 Sample Dates: 11/9/2015 - 11/16/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.05E-02 2.77E-03 2.76E-03 Sample ID: 395684 Sample Dates: 11/16/2015 - 11/23/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.69E-02 3.11E-03 2.87E-03 Sample ID: 396177 Sample Dates: 11/23/2015 - 11/30/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.33E-02 2.85E-03 2.63E-03 Sample ID: 396694 Sample Dates: 11/30/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.84E-02 3.12E-03 2.81E-03 Sample ID: 397239 Sample Dates: 12/7/2015 - 12/14/2015 Nuclide Activity 2 Sigma Error MDA Beta 4.07E-02 3.56E-03 2.57E-03 Sample ID: 397949 Sample Dates: 12/14/2015 - 12/21/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.33E-02 2.88E-03 2.70E-03 Sample ID: 398338 Sample Dates: 12/21/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.28E-02 2.31E-03 2.57E-03 Sample ID: 398727 Sample Dates: 9/28/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <3.61E-04 0.00E+00 3.61E-04 Cs-137 <6.09E-04 0.00E+00 6.09E-04 Be-7 1.62E-01 2.56E-02 1.27E-02 K-40 <1.29E-02 0.00E+00 1.29E-02 Media Type: AIR RADIOIODINE Concentration (Activity): pCi/m3 Sample Point 077 [ INDICATOR - SW @ 1 miles ]

Sample ID: 364938 Sample Dates: 12/29/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.70E-02 0.00E+00 1.70E-02 Cs-134 <1.15E-02 0.00E+00 1.15E-02 Cs-137 <1.42E-02 0.00E+00 1.42E-02 Be-7 <1.18E-01 0.00E+00 1.18E-01 K-40 5.77E-01 2.07E-01 4.74E-02 Sample ID: 365134 Sample Dates: 1/5/2015 - 1/12/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.83E-02 0.00E+00 1.83E-02 Cs-134 <9.72E-03 0.00E+00 9.72E-03 Cs-137 <2.25E-02 0.00E+00 2.25E-02 Be-7 <6.76E-02 0.00E+00 6.76E-02 K-40 5.18E-01 2.21E-01 2.12E-01 Sample ID: 365361 Sample Dates: 1/12/2015 - 1/19/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.64E-02 0.00E+00 1.64E-02 Cs-134 <1.31E-02 0.00E+00 1.31E-02 Cs-137 <1.65E-02 0.00E+00 1.65E-02 Be-7 <1.02E-01 0.00E+00 1.02E-01 K-40 2.89E-01 1.68E-01 6.52E-02 Sample ID: 366705 Sample Dates: 1/19/2015 - 1/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.36E-02 0.00E+00 1.36E-02 Cs-134 <8.35E-03 0.00E+00 8.35E-03 Cs-137 <1.22E-02 0.00E+00 1.22E-02 Be-7 <7.79E-02 0.00E+00 7.79E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 16 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 366705 Sample Dates: 1/19/2015 - 1/26/2015 Nuclide Activity 2 Sigma Error MDA K-40 2.87E-01 1.65E-01 2.03E-01 Sample ID: 367120 Sample Dates: 1/26/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.60E-02 0.00E+00 1.60E-02 Cs-134 <1.57E-02 0.00E+00 1.57E-02 Cs-137 <1.51E-02 0.00E+00 1.51E-02 Be-7 <9.15E-02 0.00E+00 9.15E-02 K-40 4.81E-01 2.24E-01 2.53E-01 Sample ID: 367613 Sample Dates: 2/2/2015 - 2/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.22E-02 0.00E+00 2.22E-02 Cs-134 <1.53E-02 0.00E+00 1.53E-02 Cs-137 <1.91E-02 0.00E+00 1.91E-02 Be-7 <1.21E-01 0.00E+00 1.21E-01 K-40 <7.04E-01 0.00E+00 7.04E-01 Sample ID: 369034 Sample Dates: 2/9/2015 - 2/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.39E-03 0.00E+00 7.39E-03 Cs-134 <3.92E-03 0.00E+00 3.92E-03 Cs-137 <1.05E-02 0.00E+00 1.05E-02 Be-7 <4.59E-02 0.00E+00 4.59E-02 K-40 3.20E-01 1.59E-01 1.97E-01 Sample ID: 369746 Sample Dates: 2/16/2015 - 2/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.58E-02 0.00E+00 1.58E-02 Cs-134 <1.62E-02 0.00E+00 1.62E-02 Cs-137 <1.84E-02 0.00E+00 1.84E-02 Be-7 <1.21E-01 0.00E+00 1.21E-01 K-40 5.04E-01 2.25E-01 2.37E-01 Sample ID: 370661 Sample Dates: 2/23/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.07E-03 0.00E+00 9.07E-03 Cs-134 <7.81E-03 0.00E+00 7.81E-03 Cs-137 <7.34E-03 0.00E+00 7.34E-03 Be-7 <6.62E-02 0.00E+00 6.62E-02 K-40 4.34E-01 1.40E-01 2.80E-02 Sample ID: 371608 Sample Dates: 3/2/2015 - 3/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.00E-02 0.00E+00 1.00E-02 Cs-134 <9.47E-03 0.00E+00 9.47E-03 Cs-137 <1.07E-02 0.00E+00 1.07E-02 Be-7 <5.28E-02 0.00E+00 5.28E-02 K-40 <3.01E-01 0.00E+00 3.01E-01 Sample ID: 371974 Sample Dates: 3/9/2015 - 3/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <4.80E-03 0.00E+00 4.80E-03 Cs-134 <4.22E-03 0.00E+00 4.22E-03 Cs-137 <4.52E-03 0.00E+00 4.52E-03 Be-7 <3.57E-02 0.00E+00 3.57E-02 K-40 3.90E-01 1.08E-01 9.41E-02 Sample ID: 372457 Sample Dates: 3/16/2015 - 3/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.48E-03 0.00E+00 7.48E-03 Cs-134 <3.70E-03 0.00E+00 3.70E-03 Cs-137 <8.82E-03 0.00E+00 8.82E-03 Be-7 <5.25E-02 0.00E+00 5.25E-02 K-40 3.46E-01 1.34E-01 1.13E-01 Sample ID: 373916 Sample Dates: 3/23/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.01E-03 0.00E+00 6.01E-03 Cs-134 <5.74E-03 0.00E+00 5.74E-03 Cs-137 <5.51E-03 0.00E+00 5.51E-03 Be-7 <5.77E-02 0.00E+00 5.77E-02 K-40 3.58E-01 1.25E-01 2.77E-02 Sample ID: 374614 Sample Dates: 3/30/2015 - 4/6/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.46E-02 0.00E+00 1.46E-02 Cs-134 <1.33E-02 0.00E+00 1.33E-02 Cs-137 <1.65E-02 0.00E+00 1.65E-02 Be-7 <8.82E-02 0.00E+00 8.82E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 17 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 374614 Sample Dates: 3/30/2015 - 4/6/2015 Nuclide Activity 2 Sigma Error MDA K-40 6.81E-01 2.51E-01 2.23E-01 Sample ID: 375001 Sample Dates: 4/6/2015 - 4/13/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.49E-02 0.00E+00 1.49E-02 Cs-134 <1.18E-02 0.00E+00 1.18E-02 Cs-137 <1.58E-02 0.00E+00 1.58E-02 Be-7 <1.03E-01 0.00E+00 1.03E-01 K-40 4.98E-01 2.40E-01 2.81E-01 Sample ID: 375682 Sample Dates: 4/13/2015 - 4/20/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.49E-03 0.00E+00 8.49E-03 Cs-134 <8.03E-03 0.00E+00 8.03E-03 Cs-137 <8.44E-03 0.00E+00 8.44E-03 Be-7 <5.84E-02 0.00E+00 5.84E-02 K-40 3.40E-01 1.34E-01 1.19E-01 Sample ID: 376889 Sample Dates: 4/20/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.77E-03 0.00E+00 6.77E-03 Cs-134 <7.76E-03 0.00E+00 7.76E-03 Cs-137 <1.01E-02 0.00E+00 1.01E-02 Be-7 <7.36E-02 0.00E+00 7.36E-02 K-40 3.63E-01 1.34E-01 1.01E-01 Sample ID: 377548 Sample Dates: 4/27/2015 - 5/4/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.91E-02 0.00E+00 1.91E-02 Cs-134 <1.19E-02 0.00E+00 1.19E-02 Cs-137 <1.20E-02 0.00E+00 1.20E-02 Be-7 <8.77E-02 0.00E+00 8.77E-02 K-40 7.05E-01 2.49E-01 1.93E-01 Sample ID: 378122 Sample Dates: 5/4/2015 - 5/11/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.35E-02 0.00E+00 1.35E-02 Cs-134 <1.24E-02 0.00E+00 1.24E-02 Cs-137 <1.54E-02 0.00E+00 1.54E-02 Be-7 <9.33E-02 0.00E+00 9.33E-02 K-40 4.73E-01 2.14E-01 2.19E-01 Sample ID: 378521 Sample Dates: 5/11/2015 - 5/18/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.50E-02 0.00E+00 1.50E-02 Cs-134 <1.07E-02 0.00E+00 1.07E-02 Cs-137 <1.75E-02 0.00E+00 1.75E-02 Be-7 <9.49E-02 0.00E+00 9.49E-02 K-40 8.04E-01 2.63E-01 1.91E-01 Sample ID: 379011 Sample Dates: 5/18/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.20E-03 0.00E+00 7.20E-03 Cs-134 <4.53E-03 0.00E+00 4.53E-03 Cs-137 <3.85E-03 0.00E+00 3.85E-03 Be-7 <5.67E-02 0.00E+00 5.67E-02 K-40 3.47E-01 1.28E-01 1.12E-01 Sample ID: 379514 Sample Dates: 5/26/2015 - 6/1/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.85E-03 0.00E+00 6.85E-03 Cs-134 <8.48E-03 0.00E+00 8.48E-03 Cs-137 <8.42E-03 0.00E+00 8.42E-03 Be-7 <6.80E-02 0.00E+00 6.80E-02 K-40 4.63E-01 1.62E-01 1.08E-01 Sample ID: 380261 Sample Dates: 6/1/2015 - 6/8/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.48E-02 0.00E+00 1.48E-02 Cs-134 <1.25E-02 0.00E+00 1.25E-02 Cs-137 <1.44E-02 0.00E+00 1.44E-02 Be-7 <9.53E-02 0.00E+00 9.53E-02 K-40 7.45E-01 2.38E-01 4.81E-02 Sample ID: 380535 Sample Dates: 6/8/2015 - 6/15/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.79E-03 0.00E+00 9.79E-03 Cs-134 <5.44E-03 0.00E+00 5.44E-03 Cs-137 <5.84E-03 0.00E+00 5.84E-03 Be-7 <5.74E-02 0.00E+00 5.74E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 18 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 380535 Sample Dates: 6/8/2015 - 6/15/2015 Nuclide Activity 2 Sigma Error MDA K-40 4.01E-01 1.34E-01 2.86E-02 Sample ID: 380861 Sample Dates: 6/15/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.26E-03 0.00E+00 7.26E-03 Cs-134 <5.69E-03 0.00E+00 5.69E-03 Cs-137 <8.84E-03 0.00E+00 8.84E-03 Be-7 <5.72E-02 0.00E+00 5.72E-02 K-40 <2.67E-01 0.00E+00 2.67E-01 Sample ID: 381328 Sample Dates: 6/22/2015 - 6/29/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.94E-03 0.00E+00 6.94E-03 Cs-134 <5.49E-03 0.00E+00 5.49E-03 Cs-137 <5.89E-03 0.00E+00 5.89E-03 Be-7 <4.88E-02 0.00E+00 4.88E-02 K-40 3.02E-01 1.44E-01 1.69E-01 Sample ID: 381654 Sample Dates: 6/29/2015 - 7/6/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.27E-02 0.00E+00 1.27E-02 Cs-134 <1.60E-02 0.00E+00 1.60E-02 Cs-137 <1.18E-02 0.00E+00 1.18E-02 Be-7 <1.08E-01 0.00E+00 1.08E-01 K-40 6.21E-01 2.30E-01 1.81E-01 Sample ID: 382223 Sample Dates: 7/6/2015 - 7/13/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.87E-03 0.00E+00 7.87E-03 Cs-134 <5.73E-03 0.00E+00 5.73E-03 Cs-137 <7.76E-03 0.00E+00 7.76E-03 Be-7 <5.42E-02 0.00E+00 5.42E-02 K-40 3.85E-01 1.49E-01 1.47E-01 Sample ID: 382647 Sample Dates: 7/13/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.44E-03 0.00E+00 7.44E-03 Cs-134 <7.69E-03 0.00E+00 7.69E-03 Cs-137 <7.23E-03 0.00E+00 7.23E-03 Be-7 <4.20E-02 0.00E+00 4.20E-02 K-40 4.67E-01 1.45E-01 2.81E-02 Sample ID: 383574 Sample Dates: 7/20/2015 - 7/27/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.70E-03 0.00E+00 8.70E-03 Cs-134 <6.97E-03 0.00E+00 6.97E-03 Cs-137 <6.60E-03 0.00E+00 6.60E-03 Be-7 <6.37E-02 0.00E+00 6.37E-02 K-40 3.61E-01 1.47E-01 1.47E-01 Sample ID: 384148 Sample Dates: 7/27/2015 - 8/3/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.62E-03 0.00E+00 8.62E-03 Cs-134 <8.31E-03 0.00E+00 8.31E-03 Cs-137 <6.67E-03 0.00E+00 6.67E-03 Be-7 <5.99E-02 0.00E+00 5.99E-02 K-40 2.92E-01 1.26E-01 1.17E-01 Sample ID: 384716 Sample Dates: 8/3/2015 - 8/10/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.05E-02 0.00E+00 2.05E-02 Cs-134 <1.17E-02 0.00E+00 1.17E-02 Cs-137 <1.32E-02 0.00E+00 1.32E-02 Be-7 <1.32E-01 0.00E+00 1.32E-01 K-40 4.57E-01 2.13E-01 2.25E-01 Sample ID: 385467 Sample Dates: 8/10/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.84E-02 0.00E+00 1.84E-02 Cs-134 <1.47E-02 0.00E+00 1.47E-02 Cs-137 <1.54E-02 0.00E+00 1.54E-02 Be-7 <1.26E-01 0.00E+00 1.26E-01 K-40 5.12E-01 2.30E-01 2.49E-01 Sample ID: 385983 Sample Dates: 8/17/2015 - 8/24/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.52E-03 0.00E+00 7.52E-03 Cs-134 <8.14E-03 0.00E+00 8.14E-03 Cs-137 <6.54E-03 0.00E+00 6.54E-03 Be-7 <7.13E-02 0.00E+00 7.13E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 19 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 385983 Sample Dates: 8/17/2015 - 8/24/2015 Nuclide Activity 2 Sigma Error MDA K-40 5.11E-01 1.53E-01 2.82E-02 Sample ID: 386880 Sample Dates: 8/24/2015 - 8/31/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.76E-03 0.00E+00 9.76E-03 Cs-134 <6.78E-03 0.00E+00 6.78E-03 Cs-137 <7.18E-03 0.00E+00 7.18E-03 Be-7 <5.45E-02 0.00E+00 5.45E-02 K-40 3.45E-01 1.55E-01 1.82E-01 Sample ID: 387464 Sample Dates: 8/31/2015 - 9/8/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.27E-03 0.00E+00 7.27E-03 Cs-134 <6.31E-03 0.00E+00 6.31E-03 Cs-137 <6.84E-03 0.00E+00 6.84E-03 Be-7 <4.80E-02 0.00E+00 4.80E-02 K-40 3.85E-01 1.31E-01 9.83E-02 Sample ID: 388821 Sample Dates: 9/8/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.00E-02 0.00E+00 1.00E-02 Cs-134 <7.36E-03 0.00E+00 7.36E-03 Cs-137 <9.15E-03 0.00E+00 9.15E-03 Be-7 <7.13E-02 0.00E+00 7.13E-02 K-40 3.97E-01 1.54E-01 1.29E-01 Sample ID: 389463 Sample Dates: 9/14/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.04E-02 0.00E+00 2.04E-02 Cs-134 <1.07E-02 0.00E+00 1.07E-02 Cs-137 <1.65E-02 0.00E+00 1.65E-02 Be-7 <1.09E-01 0.00E+00 1.09E-01 K-40 <4.77E-01 0.00E+00 4.77E-01 Sample ID: 390066 Sample Dates: 9/21/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.67E-02 0.00E+00 1.67E-02 Cs-134 <1.35E-02 0.00E+00 1.35E-02 Cs-137 <1.66E-02 0.00E+00 1.66E-02 Be-7 <7.80E-02 0.00E+00 7.80E-02 K-40 7.16E-01 2.34E-01 4.85E-02 Sample ID: 390698 Sample Dates: 9/28/2015 - 10/5/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.31E-02 0.00E+00 2.31E-02 Cs-134 <1.47E-02 0.00E+00 1.47E-02 Cs-137 <1.61E-02 0.00E+00 1.61E-02 Be-7 <9.09E-02 0.00E+00 9.09E-02 K-40 4.89E-01 2.43E-01 2.92E-01 Sample ID: 392011 Sample Dates: 10/5/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.66E-02 0.00E+00 1.66E-02 Cs-134 <1.04E-02 0.00E+00 1.04E-02 Cs-137 <1.51E-02 0.00E+00 1.51E-02 Be-7 <1.13E-01 0.00E+00 1.13E-01 K-40 3.56E-01 2.09E-01 2.68E-01 Sample ID: 392285 Sample Dates: 10/12/2015 - 10/19/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.84E-02 0.00E+00 1.84E-02 Cs-134 <1.37E-02 0.00E+00 1.37E-02 Cs-137 <1.21E-02 0.00E+00 1.21E-02 Be-7 <9.72E-02 0.00E+00 9.72E-02 K-40 4.97E-01 2.17E-01 2.08E-01 Sample ID: 393486 Sample Dates: 10/19/2015 - 10/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.70E-03 0.00E+00 6.70E-03 Cs-134 <9.87E-03 0.00E+00 9.87E-03 Cs-137 <6.36E-03 0.00E+00 6.36E-03 Be-7 <5.41E-02 0.00E+00 5.41E-02 K-40 3.34E-01 1.20E-01 2.74E-02 Sample ID: 393884 Sample Dates: 10/26/2015 - 11/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.47E-02 0.00E+00 1.47E-02 Cs-134 <1.61E-02 0.00E+00 1.61E-02 Cs-137 <1.02E-02 0.00E+00 1.02E-02 Be-7 <1.94E-02 0.00E+00 1.94E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 20 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 393884 Sample Dates: 10/26/2015 - 11/2/2015 Nuclide Activity 2 Sigma Error MDA K-40 3.28E-01 1.70E-01 1.65E-01 Sample ID: 394904 Sample Dates: 11/2/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <5.60E-03 0.00E+00 5.60E-03 Cs-134 <3.63E-03 0.00E+00 3.63E-03 Cs-137 <7.35E-03 0.00E+00 7.35E-03 Be-7 <2.93E-02 0.00E+00 2.93E-02 K-40 3.14E-01 1.36E-01 1.40E-01 Sample ID: 395358 Sample Dates: 11/9/2015 - 11/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.39E-02 0.00E+00 1.39E-02 Cs-134 <1.08E-02 0.00E+00 1.08E-02 Cs-137 <1.19E-02 0.00E+00 1.19E-02 Be-7 <9.52E-02 0.00E+00 9.52E-02 K-40 5.25E-01 2.30E-01 2.39E-01 Sample ID: 395685 Sample Dates: 11/16/2015 - 11/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.90E-02 0.00E+00 2.90E-02 Cs-134 <1.17E-02 0.00E+00 1.17E-02 Cs-137 <1.55E-02 0.00E+00 1.55E-02 Be-7 <1.40E-01 0.00E+00 1.40E-01 K-40 <5.14E-01 0.00E+00 5.14E-01 Sample ID: 396178 Sample Dates: 11/23/2015 - 11/30/2015 Nuclide Activity 2 Sigma Error MDA I-131 <5.35E-03 0.00E+00 5.35E-03 Cs-134 <7.97E-03 0.00E+00 7.97E-03 Cs-137 <8.18E-03 0.00E+00 8.18E-03 Be-7 <4.82E-02 0.00E+00 4.82E-02 K-40 2.89E-01 1.22E-01 1.02E-01 Sample ID: 396695 Sample Dates: 11/30/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.55E-02 0.00E+00 1.55E-02 Cs-134 <1.23E-02 0.00E+00 1.23E-02 Cs-137 <1.62E-02 0.00E+00 1.62E-02 Be-7 <9.33E-02 0.00E+00 9.33E-02 K-40 7.28E-01 2.50E-01 1.97E-01 Sample ID: 397240 Sample Dates: 12/7/2015 - 12/14/2015 Nuclide Activity 2 Sigma Error MDA I-131 <5.41E-03 0.00E+00 5.41E-03 Cs-134 <7.48E-03 0.00E+00 7.48E-03 Cs-137 <8.12E-03 0.00E+00 8.12E-03 Be-7 <6.02E-02 0.00E+00 6.02E-02 K-40 3.97E-01 1.43E-01 1.08E-01 Sample ID: 397950 Sample Dates: 12/14/2015 - 12/21/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.31E-03 0.00E+00 8.31E-03 Cs-134 <8.63E-03 0.00E+00 8.63E-03 Cs-137 <6.27E-03 0.00E+00 6.27E-03 Be-7 <6.93E-02 0.00E+00 6.93E-02 K-40 2.96E-01 1.19E-01 3.09E-02 Sample ID: 398339 Sample Dates: 12/21/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.17E-02 0.00E+00 1.17E-02 Cs-134 <6.43E-03 0.00E+00 6.43E-03 Cs-137 <7.98E-03 0.00E+00 7.98E-03 Be-7 <6.05E-02 0.00E+00 6.05E-02 K-40 5.17E-01 1.76E-01 1.55E-01 Sample Point 078.1 [ INDICATOR - WSW @ 0.53 miles ]

Sample ID: 364939 Sample Dates: 12/29/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.52E-02 0.00E+00 1.52E-02 Cs-134 <1.15E-02 0.00E+00 1.15E-02 Cs-137 <1.72E-02 0.00E+00 1.72E-02 Be-7 <1.06E-01 0.00E+00 1.06E-01 K-40 5.60E-01 2.03E-01 4.74E-02 Sample ID: 365135 Sample Dates: 1/5/2015 - 1/12/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.46E-02 0.00E+00 1.46E-02 Cs-134 <1.43E-02 0.00E+00 1.43E-02 Cs-137 <1.34E-02 0.00E+00 1.34E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 21 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 365135 Sample Dates: 1/5/2015 - 1/12/2015 Nuclide Activity 2 Sigma Error MDA Be-7 <9.52E-02 0.00E+00 9.52E-02 K-40 6.66E-01 2.26E-01 4.87E-02 Sample ID: 365362 Sample Dates: 1/12/2015 - 1/19/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.07E-03 0.00E+00 9.07E-03 Cs-134 <9.44E-03 0.00E+00 9.44E-03 Cs-137 <8.49E-03 0.00E+00 8.49E-03 Be-7 <6.75E-02 0.00E+00 6.75E-02 K-40 6.12E-01 1.82E-01 3.32E-02 Sample ID: 366706 Sample Dates: 1/19/2015 - 1/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.66E-03 0.00E+00 6.66E-03 Cs-134 <3.98E-03 0.00E+00 3.98E-03 Cs-137 <1.82E-03 0.00E+00 1.82E-03 Be-7 <5.20E-02 0.00E+00 5.20E-02 K-40 4.08E-01 1.41E-01 3.07E-02 Sample ID: 367121 Sample Dates: 1/26/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.00E-02 0.00E+00 2.00E-02 Cs-134 <1.04E-02 0.00E+00 1.04E-02 Cs-137 <1.51E-02 0.00E+00 1.51E-02 Be-7 <1.21E-01 0.00E+00 1.21E-01 K-40 4.48E-01 2.26E-01 2.73E-01 Sample ID: 367614 Sample Dates: 2/2/2015 - 2/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.23E-02 0.00E+00 2.23E-02 Cs-134 <1.67E-02 0.00E+00 1.67E-02 Cs-137 <1.91E-02 0.00E+00 1.91E-02 Be-7 <9.38E-02 0.00E+00 9.38E-02 K-40 <6.77E-01 0.00E+00 6.77E-01 Sample ID: 369035 Sample Dates: 2/9/2015 - 2/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.86E-02 0.00E+00 1.86E-02 Cs-134 <9.11E-03 0.00E+00 9.11E-03 Cs-137 <1.44E-02 0.00E+00 1.44E-02 Be-7 <1.36E-01 0.00E+00 1.36E-01 K-40 <6.18E-01 0.00E+00 6.18E-01 Sample ID: 369747 Sample Dates: 2/16/2015 - 2/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.76E-02 0.00E+00 1.76E-02 Cs-134 <9.59E-03 0.00E+00 9.59E-03 Cs-137 <1.02E-02 0.00E+00 1.02E-02 Be-7 <9.52E-02 0.00E+00 9.52E-02 K-40 <3.69E-01 0.00E+00 3.69E-01 Sample ID: 370662 Sample Dates: 2/23/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.04E-02 0.00E+00 1.04E-02 Cs-134 <8.89E-03 0.00E+00 8.89E-03 Cs-137 <6.30E-03 0.00E+00 6.30E-03 Be-7 <3.57E-02 0.00E+00 3.57E-02 K-40 2.72E-01 1.17E-01 1.05E-01 Sample ID: 371609 Sample Dates: 3/2/2015 - 3/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <4.56E-03 0.00E+00 4.56E-03 Cs-134 <6.69E-03 0.00E+00 6.69E-03 Cs-137 <5.89E-03 0.00E+00 5.89E-03 Be-7 <4.93E-02 0.00E+00 4.93E-02 K-40 3.25E-01 1.28E-01 9.67E-02 Sample ID: 371975 Sample Dates: 3/9/2015 - 3/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.01E-02 0.00E+00 1.01E-02 Cs-134 <6.51E-03 0.00E+00 6.51E-03 Cs-137 <7.41E-03 0.00E+00 7.41E-03 Be-7 <4.81E-02 0.00E+00 4.81E-02 K-40 3.44E-01 1.24E-01 2.83E-02 Sample ID: 372458 Sample Dates: 3/16/2015 - 3/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.00E-03 0.00E+00 9.00E-03 Cs-134 <4.53E-03 0.00E+00 4.53E-03 Cs-137 <7.95E-03 0.00E+00 7.95E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 22 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 372458 Sample Dates: 3/16/2015 - 3/23/2015 Nuclide Activity 2 Sigma Error MDA Be-7 <5.89E-02 0.00E+00 5.89E-02 K-40 3.76E-01 1.49E-01 1.49E-01 Sample ID: 373917 Sample Dates: 3/23/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.04E-02 0.00E+00 1.04E-02 Cs-134 <5.06E-03 0.00E+00 5.06E-03 Cs-137 <8.23E-03 0.00E+00 8.23E-03 Be-7 <4.55E-02 0.00E+00 4.55E-02 K-40 2.99E-01 1.24E-01 1.13E-01 Sample ID: 374615 Sample Dates: 3/30/2015 - 4/6/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.90E-02 0.00E+00 1.90E-02 Cs-134 <1.48E-02 0.00E+00 1.48E-02 Cs-137 <1.55E-02 0.00E+00 1.55E-02 Be-7 <1.03E-01 0.00E+00 1.03E-01 K-40 5.49E-01 2.02E-01 4.80E-02 Sample ID: 375002 Sample Dates: 4/6/2015 - 4/13/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.74E-02 0.00E+00 1.74E-02 Cs-134 <1.58E-02 0.00E+00 1.58E-02 Cs-137 <1.68E-02 0.00E+00 1.68E-02 Be-7 <8.76E-02 0.00E+00 8.76E-02 K-40 6.86E-01 2.30E-01 4.89E-02 Sample ID: 375683 Sample Dates: 4/13/2015 - 4/20/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.02E-02 0.00E+00 1.02E-02 Cs-134 <5.77E-03 0.00E+00 5.77E-03 Cs-137 <8.00E-03 0.00E+00 8.00E-03 Be-7 <3.98E-02 0.00E+00 3.98E-02 K-40 2.99E-01 1.37E-01 1.44E-01 Sample ID: 376890 Sample Dates: 4/20/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.83E-03 0.00E+00 8.83E-03 Cs-134 <8.54E-03 0.00E+00 8.54E-03 Cs-137 <7.66E-03 0.00E+00 7.66E-03 Be-7 <5.36E-02 0.00E+00 5.36E-02 K-40 <2.60E-01 0.00E+00 2.60E-01 Sample ID: 377549 Sample Dates: 4/27/2015 - 5/4/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.56E-02 0.00E+00 1.56E-02 Cs-134 <1.19E-02 0.00E+00 1.19E-02 Cs-137 <1.47E-02 0.00E+00 1.47E-02 Be-7 <9.56E-02 0.00E+00 9.56E-02 K-40 5.39E-01 2.23E-01 2.05E-01 Sample ID: 378123 Sample Dates: 5/4/2015 - 5/11/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.61E-02 0.00E+00 1.61E-02 Cs-134 <1.53E-02 0.00E+00 1.53E-02 Cs-137 <1.54E-02 0.00E+00 1.54E-02 Be-7 <9.31E-02 0.00E+00 9.31E-02 K-40 4.92E-01 1.90E-01 4.76E-02 Sample ID: 378522 Sample Dates: 5/11/2015 - 5/18/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.91E-02 0.00E+00 1.91E-02 Cs-134 <1.91E-02 0.00E+00 1.91E-02 Cs-137 <1.19E-02 0.00E+00 1.19E-02 Be-7 <1.09E-01 0.00E+00 1.09E-01 K-40 3.81E-01 2.05E-01 2.43E-01 Sample ID: 379012 Sample Dates: 5/18/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.17E-03 0.00E+00 8.17E-03 Cs-134 <6.12E-03 0.00E+00 6.12E-03 Cs-137 <5.01E-03 0.00E+00 5.01E-03 Be-7 <5.79E-02 0.00E+00 5.79E-02 K-40 3.08E-01 1.09E-01 2.45E-02 Sample ID: 379515 Sample Dates: 5/26/2015 - 6/1/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.75E-03 0.00E+00 9.75E-03 Cs-134 <5.47E-03 0.00E+00 5.47E-03 Cs-137 <1.03E-02 0.00E+00 1.03E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 23 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 379515 Sample Dates: 5/26/2015 - 6/1/2015 Nuclide Activity 2 Sigma Error MDA Be-7 <6.60E-02 0.00E+00 6.60E-02 K-40 3.96E-01 1.81E-01 2.13E-01 Sample ID: 380262 Sample Dates: 6/1/2015 - 6/8/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.21E-02 0.00E+00 1.21E-02 Cs-134 <1.41E-02 0.00E+00 1.41E-02 Cs-137 <1.32E-02 0.00E+00 1.32E-02 Be-7 <1.02E-01 0.00E+00 1.02E-01 K-40 5.29E-01 2.25E-01 2.23E-01 Sample ID: 380536 Sample Dates: 6/8/2015 - 6/15/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.66E-03 0.00E+00 8.66E-03 Cs-134 <7.79E-03 0.00E+00 7.79E-03 Cs-137 <7.32E-03 0.00E+00 7.32E-03 Be-7 <5.63E-02 0.00E+00 5.63E-02 K-40 3.36E-01 1.23E-01 2.84E-02 Sample ID: 380862 Sample Dates: 6/15/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.05E-03 0.00E+00 6.05E-03 Cs-134 <6.44E-03 0.00E+00 6.44E-03 Cs-137 <6.57E-03 0.00E+00 6.57E-03 Be-7 <4.23E-02 0.00E+00 4.23E-02 K-40 3.92E-01 1.50E-01 1.46E-01 Sample ID: 381329 Sample Dates: 6/22/2015 - 6/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.18E-02 0.00E+00 1.18E-02 Cs-134 <9.15E-03 0.00E+00 9.15E-03 Cs-137 <8.78E-03 0.00E+00 8.78E-03 Be-7 <8.76E-02 0.00E+00 8.76E-02 K-40 5.44E-01 2.04E-01 1.47E-01 Sample ID: 381655 Sample Dates: 6/29/2015 - 7/6/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.66E-02 0.00E+00 1.66E-02 Cs-134 <1.40E-02 0.00E+00 1.40E-02 Cs-137 <1.54E-02 0.00E+00 1.54E-02 Be-7 <1.01E-01 0.00E+00 1.01E-01 K-40 6.38E-01 2.35E-01 1.88E-01 Sample ID: 382224 Sample Dates: 7/6/2015 - 7/13/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.57E-03 0.00E+00 8.57E-03 Cs-134 <7.50E-03 0.00E+00 7.50E-03 Cs-137 <1.10E-02 0.00E+00 1.10E-02 Be-7 <5.11E-02 0.00E+00 5.11E-02 K-40 4.78E-01 1.70E-01 1.57E-01 Sample ID: 382648 Sample Dates: 7/13/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.76E-03 0.00E+00 9.76E-03 Cs-134 <7.60E-03 0.00E+00 7.60E-03 Cs-137 <8.94E-03 0.00E+00 8.94E-03 Be-7 <6.11E-02 0.00E+00 6.11E-02 K-40 4.70E-01 1.45E-01 2.77E-02 Sample ID: 383575 Sample Dates: 7/20/2015 - 7/27/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.17E-03 0.00E+00 7.17E-03 Cs-134 <9.83E-03 0.00E+00 9.83E-03 Cs-137 <4.95E-03 0.00E+00 4.95E-03 Be-7 <6.95E-02 0.00E+00 6.95E-02 K-40 2.95E-01 1.42E-01 1.61E-01 Sample ID: 384149 Sample Dates: 7/27/2015 - 8/3/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.79E-03 0.00E+00 6.79E-03 Cs-134 <7.18E-03 0.00E+00 7.18E-03 Cs-137 <8.91E-03 0.00E+00 8.91E-03 Be-7 <6.72E-02 0.00E+00 6.72E-02 K-40 2.66E-01 1.46E-01 1.91E-01 Sample ID: 384717 Sample Dates: 8/3/2015 - 8/10/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.77E-02 0.00E+00 1.77E-02 Cs-134 <1.17E-02 0.00E+00 1.17E-02 Cs-137 <1.02E-02 0.00E+00 1.02E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 24 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 384717 Sample Dates: 8/3/2015 - 8/10/2015 Nuclide Activity 2 Sigma Error MDA Be-7 <9.54E-02 0.00E+00 9.54E-02 K-40 5.62E-01 2.16E-01 1.59E-01 Sample ID: 385468 Sample Dates: 8/10/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.55E-02 0.00E+00 1.55E-02 Cs-134 <1.06E-02 0.00E+00 1.06E-02 Cs-137 <1.18E-02 0.00E+00 1.18E-02 Be-7 <8.66E-02 0.00E+00 8.66E-02 K-40 <4.99E-01 0.00E+00 4.99E-01 Sample ID: 385984 Sample Dates: 8/17/2015 - 8/24/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.24E-03 0.00E+00 9.24E-03 Cs-134 <7.61E-03 0.00E+00 7.61E-03 Cs-137 <7.57E-03 0.00E+00 7.57E-03 Be-7 <4.87E-02 0.00E+00 4.87E-02 K-40 5.48E-01 1.73E-01 1.35E-01 Sample ID: 386881 Sample Dates: 8/24/2015 - 8/31/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.82E-03 0.00E+00 6.82E-03 Cs-134 <8.68E-03 0.00E+00 8.68E-03 Cs-137 <4.56E-03 0.00E+00 4.56E-03 Be-7 <5.98E-02 0.00E+00 5.98E-02 K-40 4.19E-01 1.38E-01 2.84E-02 Sample ID: 387465 Sample Dates: 8/31/2015 - 9/8/2015 Nuclide Activity 2 Sigma Error MDA I-131 <5.64E-03 0.00E+00 5.64E-03 Cs-134 <7.27E-03 0.00E+00 7.27E-03 Cs-137 <6.51E-03 0.00E+00 6.51E-03 Be-7 <4.95E-02 0.00E+00 4.95E-02 K-40 3.14E-01 1.18E-01 9.27E-02 Sample ID: 388822 Sample Dates: 9/8/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.35E-03 0.00E+00 9.35E-03 Cs-134 <8.80E-03 0.00E+00 8.80E-03 Cs-137 <1.09E-02 0.00E+00 1.09E-02 Be-7 <7.39E-02 0.00E+00 7.39E-02 K-40 3.75E-01 1.55E-01 1.49E-01 Sample ID: 389464 Sample Dates: 9/14/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.94E-02 0.00E+00 1.94E-02 Cs-134 <1.25E-02 0.00E+00 1.25E-02 Cs-137 <1.65E-02 0.00E+00 1.65E-02 Be-7 <1.09E-01 0.00E+00 1.09E-01 K-40 3.41E-01 1.76E-01 1.77E-01 Sample ID: 390067 Sample Dates: 9/21/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.47E-02 0.00E+00 1.47E-02 Cs-134 <1.17E-02 0.00E+00 1.17E-02 Cs-137 <1.45E-02 0.00E+00 1.45E-02 Be-7 <9.48E-02 0.00E+00 9.48E-02 K-40 5.37E-01 2.40E-01 2.63E-01 Sample ID: 390699 Sample Dates: 9/28/2015 - 10/5/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.77E-02 0.00E+00 1.77E-02 Cs-134 <1.30E-02 0.00E+00 1.30E-02 Cs-137 <1.23E-02 0.00E+00 1.23E-02 Be-7 <1.32E-01 0.00E+00 1.32E-01 K-40 8.11E-01 2.54E-01 4.99E-02 Sample ID: 392012 Sample Dates: 10/5/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.94E-02 0.00E+00 1.94E-02 Cs-134 <1.30E-02 0.00E+00 1.30E-02 Cs-137 <1.51E-02 0.00E+00 1.51E-02 Be-7 <1.13E-01 0.00E+00 1.13E-01 K-40 6.94E-01 2.40E-01 1.77E-01 Sample ID: 392286 Sample Dates: 10/12/2015 - 10/19/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.69E-02 0.00E+00 1.69E-02 Cs-134 <2.10E-02 0.00E+00 2.10E-02 Cs-137 <1.88E-02 0.00E+00 1.88E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 25 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 392286 Sample Dates: 10/12/2015 - 10/19/2015 Nuclide Activity 2 Sigma Error MDA Be-7 <8.86E-02 0.00E+00 8.86E-02 K-40 6.54E-01 2.60E-01 2.65E-01 Sample ID: 393487 Sample Dates: 10/19/2015 - 10/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.10E-02 0.00E+00 1.10E-02 Cs-134 <8.42E-03 0.00E+00 8.42E-03 Cs-137 <8.65E-03 0.00E+00 8.65E-03 Be-7 <4.57E-02 0.00E+00 4.57E-02 K-40 2.44E-01 1.24E-01 1.35E-01 Sample ID: 393885 Sample Dates: 10/26/2015 - 11/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.55E-02 0.00E+00 1.55E-02 Cs-134 <1.33E-02 0.00E+00 1.33E-02 Cs-137 <1.44E-02 0.00E+00 1.44E-02 Be-7 <1.25E-01 0.00E+00 1.25E-01 K-40 5.50E-01 2.03E-01 4.81E-02 Sample ID: 394905 Sample Dates: 11/2/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.91E-03 0.00E+00 9.91E-03 Cs-134 <6.20E-03 0.00E+00 6.20E-03 Cs-137 <1.02E-02 0.00E+00 1.02E-02 Be-7 <6.71E-02 0.00E+00 6.71E-02 K-40 4.11E-01 1.44E-01 1.14E-01 Sample ID: 395359 Sample Dates: 11/9/2015 - 11/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.97E-02 0.00E+00 1.97E-02 Cs-134 <1.18E-02 0.00E+00 1.18E-02 Cs-137 <1.67E-02 0.00E+00 1.67E-02 Be-7 <1.02E-01 0.00E+00 1.02E-01 K-40 5.43E-01 2.33E-01 2.39E-01 Sample ID: 395686 Sample Dates: 11/16/2015 - 11/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.59E-02 0.00E+00 2.59E-02 Cs-134 <1.48E-02 0.00E+00 1.48E-02 Cs-137 <1.44E-02 0.00E+00 1.44E-02 Be-7 <1.35E-01 0.00E+00 1.35E-01 K-40 5.88E-01 2.29E-01 2.01E-01 Sample ID: 396179 Sample Dates: 11/23/2015 - 11/30/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.11E-03 0.00E+00 6.11E-03 Cs-134 <8.04E-03 0.00E+00 8.04E-03 Cs-137 <7.19E-03 0.00E+00 7.19E-03 Be-7 <6.17E-02 0.00E+00 6.17E-02 K-40 4.72E-01 1.46E-01 2.78E-02 Sample ID: 396696 Sample Dates: 11/30/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.73E-02 0.00E+00 1.73E-02 Cs-134 <1.05E-02 0.00E+00 1.05E-02 Cs-137 <1.88E-02 0.00E+00 1.88E-02 Be-7 <1.00E-01 0.00E+00 1.00E-01 K-40 4.90E-01 2.23E-01 2.41E-01 Sample ID: 397241 Sample Dates: 12/7/2015 - 12/14/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.26E-03 0.00E+00 9.26E-03 Cs-134 <7.03E-03 0.00E+00 7.03E-03 Cs-137 <8.12E-03 0.00E+00 8.12E-03 Be-7 <4.82E-02 0.00E+00 4.82E-02 K-40 4.16E-01 1.57E-01 1.51E-01 Sample ID: 397951 Sample Dates: 12/14/2015 - 12/21/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.56E-03 0.00E+00 7.56E-03 Cs-134 <7.75E-03 0.00E+00 7.75E-03 Cs-137 <5.63E-03 0.00E+00 5.63E-03 Be-7 <4.24E-02 0.00E+00 4.24E-02 K-40 3.79E-01 1.38E-01 1.03E-01 Sample ID: 398340 Sample Dates: 12/21/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA I-131 <5.33E-03 0.00E+00 5.33E-03 Cs-134 <7.32E-03 0.00E+00 7.32E-03 Cs-137 <7.94E-03 0.00E+00 7.94E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 26 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 398340 Sample Dates: 12/21/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA Be-7 <6.54E-02 0.00E+00 6.54E-02 K-40 3.32E-01 1.33E-01 1.18E-01 Sample Point 079 [ INDICATOR - NE @ 0.56 miles ]

Sample ID: 364940 Sample Dates: 12/29/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.33E-02 0.00E+00 1.33E-02 Cs-134 <1.31E-02 0.00E+00 1.31E-02 Cs-137 <1.53E-02 0.00E+00 1.53E-02 Be-7 <1.12E-01 0.00E+00 1.12E-01 K-40 5.68E-01 2.16E-01 1.62E-01 Sample ID: 365136 Sample Dates: 1/5/2015 - 1/12/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.80E-02 0.00E+00 1.80E-02 Cs-134 <1.18E-02 0.00E+00 1.18E-02 Cs-137 <1.57E-02 0.00E+00 1.57E-02 Be-7 <8.73E-02 0.00E+00 8.73E-02 K-40 6.55E-01 2.36E-01 1.73E-01 Sample ID: 365363 Sample Dates: 1/12/2015 - 1/19/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.32E-03 0.00E+00 9.32E-03 Cs-134 <9.64E-03 0.00E+00 9.64E-03 Cs-137 <9.16E-03 0.00E+00 9.16E-03 Be-7 <7.67E-02 0.00E+00 7.67E-02 K-40 3.41E-01 1.57E-01 1.47E-01 Sample ID: 366707 Sample Dates: 1/19/2015 - 1/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.90E-03 0.00E+00 6.90E-03 Cs-134 <6.10E-03 0.00E+00 6.10E-03 Cs-137 <4.65E-03 0.00E+00 4.65E-03 Be-7 <4.35E-02 0.00E+00 4.35E-02 K-40 4.48E-01 1.50E-01 1.06E-01 Sample ID: 367122 Sample Dates: 1/26/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.40E-02 0.00E+00 1.40E-02 Cs-134 <1.36E-02 0.00E+00 1.36E-02 Cs-137 <1.50E-02 0.00E+00 1.50E-02 Be-7 <9.09E-02 0.00E+00 9.09E-02 K-40 6.01E-01 2.09E-01 4.65E-02 Sample ID: 367615 Sample Dates: 2/2/2015 - 2/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.13E-02 0.00E+00 1.13E-02 Cs-134 <1.02E-02 0.00E+00 1.02E-02 Cs-137 <7.35E-03 0.00E+00 7.35E-03 Be-7 <3.78E-02 0.00E+00 3.78E-02 K-40 4.09E-01 1.36E-01 2.84E-02 Sample ID: 369036 Sample Dates: 2/9/2015 - 2/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.11E-03 0.00E+00 8.11E-03 Cs-134 <8.06E-03 0.00E+00 8.06E-03 Cs-137 <8.01E-03 0.00E+00 8.01E-03 Be-7 <6.06E-02 0.00E+00 6.06E-02 K-40 4.17E-01 1.61E-01 1.58E-01 Sample ID: 369748 Sample Dates: 2/16/2015 - 2/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.45E-02 0.00E+00 1.45E-02 Cs-134 <8.29E-03 0.00E+00 8.29E-03 Cs-137 <1.75E-02 0.00E+00 1.75E-02 Be-7 <1.03E-01 0.00E+00 1.03E-01 K-40 6.78E-01 2.42E-01 1.89E-01 Sample ID: 370663 Sample Dates: 2/23/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.12E-03 0.00E+00 9.12E-03 Cs-134 <8.35E-03 0.00E+00 8.35E-03 Cs-137 <9.81E-03 0.00E+00 9.81E-03 Be-7 <6.39E-02 0.00E+00 6.39E-02 K-40 4.76E-01 1.58E-01 1.10E-01 Sample ID: 371610 Sample Dates: 3/2/2015 - 3/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.21E-03 0.00E+00 9.21E-03 Cs-134 <7.42E-03 0.00E+00 7.42E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 27 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 371610 Sample Dates: 3/2/2015 - 3/9/2015 Nuclide Activity 2 Sigma Error MDA Cs-137 <6.60E-03 0.00E+00 6.60E-03 Be-7 <4.81E-02 0.00E+00 4.81E-02 K-40 2.88E-01 1.23E-01 1.06E-01 Sample ID: 371976 Sample Dates: 3/9/2015 - 3/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.97E-03 0.00E+00 8.97E-03 Cs-134 <7.61E-03 0.00E+00 7.61E-03 Cs-137 <9.44E-03 0.00E+00 9.44E-03 Be-7 <3.62E-02 0.00E+00 3.62E-02 K-40 3.51E-01 1.40E-01 1.35E-01 Sample ID: 372459 Sample Dates: 3/16/2015 - 3/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.04E-02 0.00E+00 1.04E-02 Cs-134 <7.55E-03 0.00E+00 7.55E-03 Cs-137 <6.73E-03 0.00E+00 6.73E-03 Be-7 <4.31E-02 0.00E+00 4.31E-02 K-40 3.55E-01 1.37E-01 1.18E-01 Sample ID: 373918 Sample Dates: 3/23/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.08E-02 0.00E+00 1.08E-02 Cs-134 <8.26E-03 0.00E+00 8.26E-03 Cs-137 <8.48E-03 0.00E+00 8.48E-03 Be-7 <5.00E-02 0.00E+00 5.00E-02 K-40 4.79E-01 1.50E-01 2.95E-02 Sample ID: 374616 Sample Dates: 3/30/2015 - 4/6/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.24E-02 0.00E+00 2.24E-02 Cs-134 <9.81E-03 0.00E+00 9.81E-03 Cs-137 <1.59E-02 0.00E+00 1.59E-02 Be-7 <1.36E-01 0.00E+00 1.36E-01 K-40 6.54E-01 2.25E-01 4.92E-02 Sample ID: 375003 Sample Dates: 4/6/2015 - 4/13/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.55E-02 0.00E+00 1.55E-02 Cs-134 <1.41E-02 0.00E+00 1.41E-02 Cs-137 <1.91E-02 0.00E+00 1.91E-02 Be-7 <1.01E-01 0.00E+00 1.01E-01 K-40 5.50E-01 2.03E-01 4.80E-02 Sample ID: 375684 Sample Dates: 4/13/2015 - 4/20/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.04E-03 0.00E+00 9.04E-03 Cs-134 <4.67E-03 0.00E+00 4.67E-03 Cs-137 <7.52E-03 0.00E+00 7.52E-03 Be-7 <5.25E-02 0.00E+00 5.25E-02 K-40 3.88E-01 1.32E-01 2.85E-02 Sample ID: 376891 Sample Dates: 4/20/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.54E-03 0.00E+00 9.54E-03 Cs-134 <6.85E-03 0.00E+00 6.85E-03 Cs-137 <7.79E-03 0.00E+00 7.79E-03 Be-7 <5.48E-02 0.00E+00 5.48E-02 K-40 3.79E-01 1.57E-01 1.69E-01 Sample ID: 377550 Sample Dates: 4/27/2015 - 5/4/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.66E-02 0.00E+00 1.66E-02 Cs-134 <1.19E-02 0.00E+00 1.19E-02 Cs-137 <1.21E-02 0.00E+00 1.21E-02 Be-7 <1.10E-01 0.00E+00 1.10E-01 K-40 4.03E-01 1.92E-01 1.83E-01 Sample ID: 378124 Sample Dates: 5/4/2015 - 5/11/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.61E-02 0.00E+00 1.61E-02 Cs-134 <1.47E-02 0.00E+00 1.47E-02 Cs-137 <1.31E-02 0.00E+00 1.31E-02 Be-7 <1.24E-01 0.00E+00 1.24E-01 K-40 5.82E-01 2.24E-01 1.87E-01 Sample ID: 378523 Sample Dates: 5/11/2015 - 5/18/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.83E-02 0.00E+00 1.83E-02 Cs-134 <1.07E-02 0.00E+00 1.07E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 28 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 378523 Sample Dates: 5/11/2015 - 5/18/2015 Nuclide Activity 2 Sigma Error MDA Cs-137 <2.08E-02 0.00E+00 2.08E-02 Be-7 <1.08E-01 0.00E+00 1.08E-01 K-40 5.17E-01 1.97E-01 4.83E-02 Sample ID: 379013 Sample Dates: 5/18/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.19E-03 0.00E+00 7.19E-03 Cs-134 <4.52E-03 0.00E+00 4.52E-03 Cs-137 <4.85E-03 0.00E+00 4.85E-03 Be-7 <4.79E-02 0.00E+00 4.79E-02 K-40 3.24E-01 1.20E-01 9.53E-02 Sample ID: 379516 Sample Dates: 5/26/2015 - 6/1/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.85E-02 0.00E+00 1.85E-02 Cs-134 <1.48E-02 0.00E+00 1.48E-02 Cs-137 <1.83E-02 0.00E+00 1.83E-02 Be-7 <7.82E-02 0.00E+00 7.82E-02 K-40 <5.45E-01 0.00E+00 5.45E-01 Sample ID: 380263 Sample Dates: 6/1/2015 - 6/8/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.78E-02 0.00E+00 1.78E-02 Cs-134 <1.48E-02 0.00E+00 1.48E-02 Cs-137 <1.55E-02 0.00E+00 1.55E-02 Be-7 <1.03E-01 0.00E+00 1.03E-01 K-40 7.49E-01 2.52E-01 1.81E-01 Sample ID: 380537 Sample Dates: 6/8/2015 - 6/15/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.64E-03 0.00E+00 6.64E-03 Cs-134 <5.42E-03 0.00E+00 5.42E-03 Cs-137 <1.04E-02 0.00E+00 1.04E-02 Be-7 <5.32E-02 0.00E+00 5.32E-02 K-40 3.36E-01 1.47E-01 1.62E-01 Sample ID: 380863 Sample Dates: 6/15/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.24E-03 0.00E+00 8.24E-03 Cs-134 <5.04E-03 0.00E+00 5.04E-03 Cs-137 <6.98E-03 0.00E+00 6.98E-03 Be-7 <6.58E-02 0.00E+00 6.58E-02 K-40 3.39E-01 1.20E-01 2.70E-02 Sample ID: 381330 Sample Dates: 6/22/2015 - 6/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.42E-02 0.00E+00 1.42E-02 Cs-134 <1.30E-02 0.00E+00 1.30E-02 Cs-137 <1.53E-02 0.00E+00 1.53E-02 Be-7 <5.91E-02 0.00E+00 5.91E-02 K-40 6.29E-01 2.67E-01 3.13E-01 Sample ID: 381656 Sample Dates: 6/29/2015 - 7/6/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.38E-02 0.00E+00 1.38E-02 Cs-134 <1.25E-02 0.00E+00 1.25E-02 Cs-137 <1.32E-02 0.00E+00 1.32E-02 Be-7 <1.08E-01 0.00E+00 1.08E-01 K-40 6.56E-01 2.60E-01 2.71E-01 Sample ID: 382225 Sample Dates: 7/6/2015 - 7/13/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.96E-03 0.00E+00 8.96E-03 Cs-134 <8.32E-03 0.00E+00 8.32E-03 Cs-137 <5.77E-03 0.00E+00 5.77E-03 Be-7 <5.60E-02 0.00E+00 5.60E-02 K-40 <2.85E-01 0.00E+00 2.85E-01 Sample ID: 382649 Sample Dates: 7/13/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.09E-03 0.00E+00 6.09E-03 Cs-134 <7.86E-03 0.00E+00 7.86E-03 Cs-137 <5.71E-03 0.00E+00 5.71E-03 Be-7 <5.58E-02 0.00E+00 5.58E-02 K-40 4.68E-01 1.46E-01 2.82E-02 Sample ID: 383576 Sample Dates: 7/20/2015 - 7/27/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.18E-03 0.00E+00 9.18E-03 Cs-134 <7.73E-03 0.00E+00 7.73E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 29 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 383576 Sample Dates: 7/20/2015 - 7/27/2015 Nuclide Activity 2 Sigma Error MDA Cs-137 <5.62E-03 0.00E+00 5.62E-03 Be-7 <5.96E-02 0.00E+00 5.96E-02 K-40 4.15E-01 1.62E-01 1.72E-01 Sample ID: 384150 Sample Dates: 7/27/2015 - 8/3/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.75E-03 0.00E+00 9.75E-03 Cs-134 <3.92E-03 0.00E+00 3.92E-03 Cs-137 <1.10E-02 0.00E+00 1.10E-02 Be-7 <7.44E-02 0.00E+00 7.44E-02 K-40 2.89E-01 1.53E-01 1.94E-01 Sample ID: 384718 Sample Dates: 8/3/2015 - 8/10/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.94E-02 0.00E+00 1.94E-02 Cs-134 <1.17E-02 0.00E+00 1.17E-02 Cs-137 <1.44E-02 0.00E+00 1.44E-02 Be-7 <1.03E-01 0.00E+00 1.03E-01 K-40 8.18E-01 2.51E-01 4.82E-02 Sample ID: 385469 Sample Dates: 8/10/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.62E-02 0.00E+00 1.62E-02 Cs-134 <1.38E-02 0.00E+00 1.38E-02 Cs-137 <1.30E-02 0.00E+00 1.30E-02 Be-7 <9.32E-02 0.00E+00 9.32E-02 K-40 4.12E-01 2.02E-01 2.18E-01 Sample ID: 385985 Sample Dates: 8/17/2015 - 8/24/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.08E-02 0.00E+00 1.08E-02 Cs-134 <7.33E-03 0.00E+00 7.33E-03 Cs-137 <5.63E-03 0.00E+00 5.63E-03 Be-7 <5.17E-02 0.00E+00 5.17E-02 K-40 2.94E-01 1.32E-01 1.38E-01 Sample ID: 386882 Sample Dates: 8/24/2015 - 8/31/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.33E-03 0.00E+00 7.33E-03 Cs-134 <5.75E-03 0.00E+00 5.75E-03 Cs-137 <5.51E-03 0.00E+00 5.51E-03 Be-7 <5.06E-02 0.00E+00 5.06E-02 K-40 3.88E-01 1.39E-01 1.05E-01 Sample ID: 387466 Sample Dates: 8/31/2015 - 9/8/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.26E-03 0.00E+00 8.26E-03 Cs-134 <5.58E-03 0.00E+00 5.58E-03 Cs-137 <6.93E-03 0.00E+00 6.93E-03 Be-7 <4.14E-02 0.00E+00 4.14E-02 K-40 3.82E-01 1.31E-01 9.93E-02 Sample ID: 388823 Sample Dates: 9/8/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.44E-03 0.00E+00 7.44E-03 Cs-134 <1.03E-02 0.00E+00 1.03E-02 Cs-137 <5.02E-03 0.00E+00 5.02E-03 Be-7 <6.21E-02 0.00E+00 6.21E-02 K-40 3.93E-01 1.65E-01 1.74E-01 Sample ID: 389465 Sample Dates: 9/14/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.20E-02 0.00E+00 1.20E-02 Cs-134 <1.16E-02 0.00E+00 1.16E-02 Cs-137 <8.07E-03 0.00E+00 8.07E-03 Be-7 <9.49E-02 0.00E+00 9.49E-02 K-40 4.53E-01 2.14E-01 2.31E-01 Sample ID: 390068 Sample Dates: 9/21/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.13E-02 0.00E+00 1.13E-02 Cs-134 <1.70E-02 0.00E+00 1.70E-02 Cs-137 <1.57E-02 0.00E+00 1.57E-02 Be-7 <1.15E-01 0.00E+00 1.15E-01 K-40 2.97E-01 1.92E-01 2.49E-01 Sample ID: 390700 Sample Dates: 9/28/2015 - 10/5/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.70E-02 0.00E+00 1.70E-02 Cs-134 <1.55E-02 0.00E+00 1.55E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 30 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 390700 Sample Dates: 9/28/2015 - 10/5/2015 Nuclide Activity 2 Sigma Error MDA Cs-137 <1.55E-02 0.00E+00 1.55E-02 Be-7 <9.55E-02 0.00E+00 9.55E-02 K-40 4.97E-01 1.92E-01 4.81E-02 Sample ID: 392013 Sample Dates: 10/5/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.18E-02 0.00E+00 2.18E-02 Cs-134 <1.30E-02 0.00E+00 1.30E-02 Cs-137 <1.28E-02 0.00E+00 1.28E-02 Be-7 <9.32E-02 0.00E+00 9.32E-02 K-40 5.68E-01 2.03E-01 4.66E-02 Sample ID: 392287 Sample Dates: 10/12/2015 - 10/19/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.41E-02 0.00E+00 1.41E-02 Cs-134 <1.61E-02 0.00E+00 1.61E-02 Cs-137 <1.61E-02 0.00E+00 1.61E-02 Be-7 <9.79E-02 0.00E+00 9.79E-02 K-40 <4.80E-01 0.00E+00 4.80E-01 Sample ID: 393488 Sample Dates: 10/19/2015 - 10/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.91E-03 0.00E+00 7.91E-03 Cs-134 <4.49E-03 0.00E+00 4.49E-03 Cs-137 <7.88E-03 0.00E+00 7.88E-03 Be-7 <6.77E-02 0.00E+00 6.77E-02 K-40 2.71E-01 1.19E-01 1.06E-01 Sample ID: 393886 Sample Dates: 10/26/2015 - 11/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.35E-02 0.00E+00 1.35E-02 Cs-134 <6.55E-03 0.00E+00 6.55E-03 Cs-137 <1.18E-02 0.00E+00 1.18E-02 Be-7 <9.42E-02 0.00E+00 9.42E-02 K-40 5.03E-01 2.25E-01 2.38E-01 Sample ID: 394906 Sample Dates: 11/2/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.21E-02 0.00E+00 1.21E-02 Cs-134 <4.88E-03 0.00E+00 4.88E-03 Cs-137 <7.84E-03 0.00E+00 7.84E-03 Be-7 <6.37E-02 0.00E+00 6.37E-02 K-40 4.63E-01 1.57E-01 1.15E-01 Sample ID: 395360 Sample Dates: 11/9/2015 - 11/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.75E-02 0.00E+00 1.75E-02 Cs-134 <1.18E-02 0.00E+00 1.18E-02 Cs-137 <1.03E-02 0.00E+00 1.03E-02 Be-7 <1.15E-01 0.00E+00 1.15E-01 K-40 5.57E-01 2.05E-01 4.87E-02 Sample ID: 395687 Sample Dates: 11/16/2015 - 11/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <3.13E-02 0.00E+00 3.13E-02 Cs-134 <1.62E-02 0.00E+00 1.62E-02 Cs-137 <1.18E-02 0.00E+00 1.18E-02 Be-7 <1.09E-01 0.00E+00 1.09E-01 K-40 7.93E-01 2.63E-01 2.01E-01 Sample ID: 396180 Sample Dates: 11/23/2015 - 11/30/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.43E-03 0.00E+00 7.43E-03 Cs-134 <7.06E-03 0.00E+00 7.06E-03 Cs-137 <6.21E-03 0.00E+00 6.21E-03 Be-7 <5.65E-02 0.00E+00 5.65E-02 K-40 4.51E-01 1.48E-01 3.05E-02 Sample ID: 396697 Sample Dates: 11/30/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.88E-02 0.00E+00 1.88E-02 Cs-134 <1.44E-02 0.00E+00 1.44E-02 Cs-137 <1.40E-02 0.00E+00 1.40E-02 Be-7 <1.06E-01 0.00E+00 1.06E-01 K-40 4.84E-01 2.06E-01 1.88E-01 Sample ID: 397242 Sample Dates: 12/7/2015 - 12/14/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.68E-03 0.00E+00 7.68E-03 Cs-134 <7.95E-03 0.00E+00 7.95E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 31 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 397242 Sample Dates: 12/7/2015 - 12/14/2015 Nuclide Activity 2 Sigma Error MDA Cs-137 <8.77E-03 0.00E+00 8.77E-03 Be-7 <4.34E-02 0.00E+00 4.34E-02 K-40 3.86E-01 1.33E-01 2.90E-02 Sample ID: 397952 Sample Dates: 12/14/2015 - 12/21/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.81E-03 0.00E+00 9.81E-03 Cs-134 <6.40E-03 0.00E+00 6.40E-03 Cs-137 <1.10E-02 0.00E+00 1.10E-02 Be-7 <5.13E-02 0.00E+00 5.13E-02 K-40 4.20E-01 1.64E-01 1.66E-01 Sample ID: 398341 Sample Dates: 12/21/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.95E-03 0.00E+00 8.95E-03 Cs-134 <8.67E-03 0.00E+00 8.67E-03 Cs-137 <8.15E-03 0.00E+00 8.15E-03 Be-7 <5.75E-02 0.00E+00 5.75E-02 K-40 3.81E-01 1.45E-01 1.13E-01 Sample Point 081 [ CONTROL - SE @ 9.33 miles ]

Sample ID: 364941 Sample Dates: 12/29/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.05E-02 0.00E+00 2.05E-02 Cs-134 <9.39E-03 0.00E+00 9.39E-03 Cs-137 <1.30E-02 0.00E+00 1.30E-02 Be-7 <9.93E-02 0.00E+00 9.93E-02 K-40 5.74E-01 2.06E-01 4.72E-02 Sample ID: 365137 Sample Dates: 1/5/2015 - 1/12/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.37E-02 0.00E+00 1.37E-02 Cs-134 <1.18E-02 0.00E+00 1.18E-02 Cs-137 <1.57E-02 0.00E+00 1.57E-02 Be-7 <1.21E-01 0.00E+00 1.21E-01 K-40 <4.60E-01 0.00E+00 4.60E-01 Sample ID: 365364 Sample Dates: 1/12/2015 - 1/19/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.30E-03 0.00E+00 9.30E-03 Cs-134 <6.97E-03 0.00E+00 6.97E-03 Cs-137 <9.31E-03 0.00E+00 9.31E-03 Be-7 <4.59E-02 0.00E+00 4.59E-02 K-40 4.56E-01 1.58E-01 1.20E-01 Sample ID: 366708 Sample Dates: 1/19/2015 - 1/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.22E-02 0.00E+00 2.22E-02 Cs-134 <1.64E-02 0.00E+00 1.64E-02 Cs-137 <2.21E-02 0.00E+00 2.21E-02 Be-7 <1.05E-01 0.00E+00 1.05E-01 K-40 5.08E-01 2.57E-01 2.31E-01 Sample ID: 367123 Sample Dates: 1/26/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.61E-02 0.00E+00 1.61E-02 Cs-134 <1.14E-02 0.00E+00 1.14E-02 Cs-137 <7.90E-03 0.00E+00 7.90E-03 Be-7 <1.27E-01 0.00E+00 1.27E-01 K-40 5.14E-01 2.24E-01 2.34E-01 Sample ID: 367616 Sample Dates: 2/2/2015 - 2/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.24E-02 0.00E+00 2.24E-02 Cs-134 <1.18E-02 0.00E+00 1.18E-02 Cs-137 <1.91E-02 0.00E+00 1.91E-02 Be-7 <1.08E-01 0.00E+00 1.08E-01 K-40 <5.86E-01 0.00E+00 5.86E-01 Sample ID: 369037 Sample Dates: 2/9/2015 - 2/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.48E-03 0.00E+00 7.48E-03 Cs-134 <8.69E-03 0.00E+00 8.69E-03 Cs-137 <6.40E-03 0.00E+00 6.40E-03 Be-7 <4.17E-02 0.00E+00 4.17E-02 K-40 3.77E-01 1.41E-01 1.23E-01 Sample ID: 369749 Sample Dates: 2/16/2015 - 2/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.24E-02 0.00E+00 2.24E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 32 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 369749 Sample Dates: 2/16/2015 - 2/23/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.33E-02 0.00E+00 1.33E-02 Cs-137 <1.65E-02 0.00E+00 1.65E-02 Be-7 <1.09E-01 0.00E+00 1.09E-01 K-40 5.32E-01 1.99E-01 4.80E-02 Sample ID: 370664 Sample Dates: 2/23/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.31E-03 0.00E+00 7.31E-03 Cs-134 <5.95E-03 0.00E+00 5.95E-03 Cs-137 <5.72E-03 0.00E+00 5.72E-03 Be-7 <5.99E-02 0.00E+00 5.99E-02 K-40 4.64E-01 1.44E-01 2.80E-02 Sample ID: 371611 Sample Dates: 3/2/2015 - 3/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.71E-03 0.00E+00 6.71E-03 Cs-134 <7.62E-03 0.00E+00 7.62E-03 Cs-137 <7.57E-03 0.00E+00 7.57E-03 Be-7 <4.92E-02 0.00E+00 4.92E-02 K-40 3.64E-01 1.37E-01 1.07E-01 Sample ID: 371977 Sample Dates: 3/9/2015 - 3/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.22E-03 0.00E+00 9.22E-03 Cs-134 <5.73E-03 0.00E+00 5.73E-03 Cs-137 <8.67E-03 0.00E+00 8.67E-03 Be-7 <5.64E-02 0.00E+00 5.64E-02 K-40 3.83E-01 1.71E-01 2.02E-01 Sample ID: 372460 Sample Dates: 3/16/2015 - 3/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.63E-03 0.00E+00 8.63E-03 Cs-134 <6.41E-03 0.00E+00 6.41E-03 Cs-137 <6.54E-03 0.00E+00 6.54E-03 Be-7 <5.55E-02 0.00E+00 5.55E-02 K-40 3.27E-01 1.59E-01 1.99E-01 Sample ID: 373919 Sample Dates: 3/23/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.30E-03 0.00E+00 7.30E-03 Cs-134 <9.79E-03 0.00E+00 9.79E-03 Cs-137 <6.32E-03 0.00E+00 6.32E-03 Be-7 <5.71E-02 0.00E+00 5.71E-02 K-40 3.53E-01 1.24E-01 2.73E-02 Sample ID: 374617 Sample Dates: 3/30/2015 - 4/6/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.05E-02 0.00E+00 2.05E-02 Cs-134 <1.56E-02 0.00E+00 1.56E-02 Cs-137 <1.66E-02 0.00E+00 1.66E-02 Be-7 <9.72E-02 0.00E+00 9.72E-02 K-40 5.48E-01 2.13E-01 1.53E-01 Sample ID: 375004 Sample Dates: 4/6/2015 - 4/13/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.57E-02 0.00E+00 1.57E-02 Cs-134 <1.26E-02 0.00E+00 1.26E-02 Cs-137 <1.45E-02 0.00E+00 1.45E-02 Be-7 <1.36E-01 0.00E+00 1.36E-01 K-40 5.90E-01 2.27E-01 1.85E-01 Sample ID: 375685 Sample Dates: 4/13/2015 - 4/20/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.08E-03 0.00E+00 8.08E-03 Cs-134 <6.42E-03 0.00E+00 6.42E-03 Cs-137 <8.58E-03 0.00E+00 8.58E-03 Be-7 <4.73E-02 0.00E+00 4.73E-02 K-40 <2.82E-01 0.00E+00 2.82E-01 Sample ID: 376892 Sample Dates: 4/20/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.02E-03 0.00E+00 9.02E-03 Cs-134 <5.31E-03 0.00E+00 5.31E-03 Cs-137 <6.60E-03 0.00E+00 6.60E-03 Be-7 <5.55E-02 0.00E+00 5.55E-02 K-40 4.01E-01 1.33E-01 2.79E-02 Sample ID: 377551 Sample Dates: 4/27/2015 - 5/4/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.57E-02 0.00E+00 1.57E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 33 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 377551 Sample Dates: 4/27/2015 - 5/4/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.50E-02 0.00E+00 1.50E-02 Cs-137 <1.67E-02 0.00E+00 1.67E-02 Be-7 <1.03E-01 0.00E+00 1.03E-01 K-40 6.12E-01 2.16E-01 4.88E-02 Sample ID: 378125 Sample Dates: 5/4/2015 - 5/11/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.55E-02 0.00E+00 1.55E-02 Cs-134 <1.16E-02 0.00E+00 1.16E-02 Cs-137 <1.31E-02 0.00E+00 1.31E-02 Be-7 <1.13E-01 0.00E+00 1.13E-01 K-40 6.13E-01 2.34E-01 2.04E-01 Sample ID: 378524 Sample Dates: 5/11/2015 - 5/18/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.21E-02 0.00E+00 1.21E-02 Cs-134 <7.08E-03 0.00E+00 7.08E-03 Cs-137 <1.06E-02 0.00E+00 1.06E-02 Be-7 <5.24E-02 0.00E+00 5.24E-02 K-40 3.59E-01 1.36E-01 9.05E-02 Sample ID: 379014 Sample Dates: 5/18/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.79E-03 0.00E+00 6.79E-03 Cs-134 <6.47E-03 0.00E+00 6.47E-03 Cs-137 <7.55E-03 0.00E+00 7.55E-03 Be-7 <4.17E-02 0.00E+00 4.17E-02 K-40 2.32E-01 1.36E-01 1.86E-01 Sample ID: 379517 Sample Dates: 5/26/2015 - 6/1/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.97E-02 0.00E+00 1.97E-02 Cs-134 <1.75E-02 0.00E+00 1.75E-02 Cs-137 <1.70E-02 0.00E+00 1.70E-02 Be-7 <1.01E-01 0.00E+00 1.01E-01 K-40 5.31E-01 2.75E-01 3.38E-01 Sample ID: 380264 Sample Dates: 6/1/2015 - 6/8/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.79E-02 0.00E+00 1.79E-02 Cs-134 <1.33E-02 0.00E+00 1.33E-02 Cs-137 <1.01E-02 0.00E+00 1.01E-02 Be-7 <8.69E-02 0.00E+00 8.69E-02 K-40 6.43E-01 2.31E-01 1.65E-01 Sample ID: 380538 Sample Dates: 6/8/2015 - 6/15/2015 Nuclide Activity 2 Sigma Error MDA I-131 <5.69E-03 0.00E+00 5.69E-03 Cs-134 <8.06E-03 0.00E+00 8.06E-03 Cs-137 <4.41E-03 0.00E+00 4.41E-03 Be-7 <1.07E-02 0.00E+00 1.07E-02 K-40 2.67E-01 1.08E-01 2.79E-02 Sample ID: 380864 Sample Dates: 6/15/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.61E-03 0.00E+00 8.61E-03 Cs-134 <7.92E-03 0.00E+00 7.92E-03 Cs-137 <1.04E-02 0.00E+00 1.04E-02 Be-7 <5.54E-02 0.00E+00 5.54E-02 K-40 4.56E-01 1.55E-01 1.10E-01 Sample ID: 381331 Sample Dates: 6/22/2015 - 6/29/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.48E-02 0.00E+00 1.48E-02 Cs-134 <1.43E-02 0.00E+00 1.43E-02 Cs-137 <1.67E-02 0.00E+00 1.67E-02 Be-7 <1.15E-01 0.00E+00 1.15E-01 K-40 7.43E-01 2.92E-01 3.25E-01 Sample ID: 381657 Sample Dates: 6/29/2015 - 7/6/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.84E-02 0.00E+00 1.84E-02 Cs-134 <1.16E-02 0.00E+00 1.16E-02 Cs-137 <1.64E-02 0.00E+00 1.64E-02 Be-7 <8.62E-02 0.00E+00 8.62E-02 K-40 <4.83E-01 0.00E+00 4.83E-01 Sample ID: 382226 Sample Dates: 7/6/2015 - 7/13/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.59E-03 0.00E+00 8.59E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 34 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 382226 Sample Dates: 7/6/2015 - 7/13/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <5.82E-03 0.00E+00 5.82E-03 Cs-137 <7.23E-03 0.00E+00 7.23E-03 Be-7 <5.51E-02 0.00E+00 5.51E-02 K-40 4.04E-01 1.34E-01 2.81E-02 Sample ID: 382650 Sample Dates: 7/13/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.49E-03 0.00E+00 8.49E-03 Cs-134 <7.16E-03 0.00E+00 7.16E-03 Cs-137 <7.11E-03 0.00E+00 7.11E-03 Be-7 <5.43E-02 0.00E+00 5.43E-02 K-40 4.04E-01 1.52E-01 1.48E-01 Sample ID: 383577 Sample Dates: 7/20/2015 - 7/27/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.08E-02 0.00E+00 1.08E-02 Cs-134 <7.13E-03 0.00E+00 7.13E-03 Cs-137 <8.23E-03 0.00E+00 8.23E-03 Be-7 <6.13E-02 0.00E+00 6.13E-02 K-40 3.62E-01 1.63E-01 1.95E-01 Sample ID: 384151 Sample Dates: 7/27/2015 - 8/3/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.16E-03 0.00E+00 9.16E-03 Cs-134 <4.66E-03 0.00E+00 4.66E-03 Cs-137 <5.79E-03 0.00E+00 5.79E-03 Be-7 <6.01E-02 0.00E+00 6.01E-02 K-40 <3.00E-01 0.00E+00 3.00E-01 Sample ID: 384719 Sample Dates: 8/3/2015 - 8/10/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.59E-02 0.00E+00 1.59E-02 Cs-134 <1.07E-02 0.00E+00 1.07E-02 Cs-137 <1.66E-02 0.00E+00 1.66E-02 Be-7 <1.03E-01 0.00E+00 1.03E-01 K-40 6.68E-01 2.35E-01 1.62E-01 Sample ID: 385470 Sample Dates: 8/10/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.55E-02 0.00E+00 1.55E-02 Cs-134 <1.39E-02 0.00E+00 1.39E-02 Cs-137 <1.63E-02 0.00E+00 1.63E-02 Be-7 <1.19E-01 0.00E+00 1.19E-01 K-40 4.11E-01 2.39E-01 3.20E-01 Sample ID: 385986 Sample Dates: 8/17/2015 - 8/24/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.05E-02 0.00E+00 1.05E-02 Cs-134 <6.50E-03 0.00E+00 6.50E-03 Cs-137 <6.24E-03 0.00E+00 6.24E-03 Be-7 <3.19E-02 0.00E+00 3.19E-02 K-40 <3.43E-01 0.00E+00 3.43E-01 Sample ID: 386883 Sample Dates: 8/24/2015 - 8/31/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.03E-02 0.00E+00 1.03E-02 Cs-134 <7.54E-03 0.00E+00 7.54E-03 Cs-137 <7.98E-03 0.00E+00 7.98E-03 Be-7 <7.14E-02 0.00E+00 7.14E-02 K-40 3.47E-01 1.51E-01 1.61E-01 Sample ID: 387467 Sample Dates: 8/31/2015 - 9/8/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.81E-03 0.00E+00 6.81E-03 Cs-134 <6.31E-03 0.00E+00 6.31E-03 Cs-137 <5.62E-03 0.00E+00 5.62E-03 Be-7 <5.40E-02 0.00E+00 5.40E-02 K-40 <2.60E-01 0.00E+00 2.60E-01 Sample ID: 388824 Sample Dates: 9/8/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.39E-03 0.00E+00 7.39E-03 Cs-134 <8.70E-03 0.00E+00 8.70E-03 Cs-137 <1.08E-02 0.00E+00 1.08E-02 Be-7 <7.79E-02 0.00E+00 7.79E-02 K-40 4.13E-01 1.50E-01 3.50E-02 Sample ID: 389466 Sample Dates: 9/14/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.80E-02 0.00E+00 1.80E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 35 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 389466 Sample Dates: 9/14/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <1.26E-02 0.00E+00 1.26E-02 Cs-137 <1.02E-02 0.00E+00 1.02E-02 Be-7 <9.56E-02 0.00E+00 9.56E-02 K-40 4.84E-01 2.57E-01 3.33E-01 Sample ID: 390069 Sample Dates: 9/21/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.58E-02 0.00E+00 1.58E-02 Cs-134 <1.17E-02 0.00E+00 1.17E-02 Cs-137 <1.56E-02 0.00E+00 1.56E-02 Be-7 <5.31E-02 0.00E+00 5.31E-02 K-40 <4.28E-01 0.00E+00 4.28E-01 Sample ID: 390701 Sample Dates: 9/28/2015 - 10/5/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.82E-02 0.00E+00 1.82E-02 Cs-134 <1.41E-02 0.00E+00 1.41E-02 Cs-137 <1.44E-02 0.00E+00 1.44E-02 Be-7 <1.03E-01 0.00E+00 1.03E-01 K-40 5.27E-01 2.71E-01 3.53E-01 Sample ID: 392014 Sample Dates: 10/5/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.06E-02 0.00E+00 2.06E-02 Cs-134 <1.45E-02 0.00E+00 1.45E-02 Cs-137 <1.29E-02 0.00E+00 1.29E-02 Be-7 <1.08E-01 0.00E+00 1.08E-01 K-40 5.37E-01 1.98E-01 4.69E-02 Sample ID: 392288 Sample Dates: 10/12/2015 - 10/19/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.87E-02 0.00E+00 1.87E-02 Cs-134 <1.19E-02 0.00E+00 1.19E-02 Cs-137 <8.27E-03 0.00E+00 8.27E-03 Be-7 <6.82E-02 0.00E+00 6.82E-02 K-40 6.96E-01 2.44E-01 1.74E-01 Sample ID: 393489 Sample Dates: 10/19/2015 - 10/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.45E-02 0.00E+00 1.45E-02 Cs-134 <1.33E-02 0.00E+00 1.33E-02 Cs-137 <1.73E-02 0.00E+00 1.73E-02 Be-7 <9.36E-02 0.00E+00 9.36E-02 K-40 5.12E-01 1.95E-01 4.78E-02 Sample ID: 393887 Sample Dates: 10/26/2015 - 11/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.57E-02 0.00E+00 1.57E-02 Cs-134 <1.61E-02 0.00E+00 1.61E-02 Cs-137 <1.18E-02 0.00E+00 1.18E-02 Be-7 <1.01E-01 0.00E+00 1.01E-01 K-40 4.96E-01 1.92E-01 4.80E-02 Sample ID: 394907 Sample Dates: 11/2/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <9.08E-03 0.00E+00 9.08E-03 Cs-134 <5.78E-03 0.00E+00 5.78E-03 Cs-137 <6.43E-03 0.00E+00 6.43E-03 Be-7 <4.21E-02 0.00E+00 4.21E-02 K-40 4.11E-01 1.35E-01 2.79E-02 Sample ID: 395361 Sample Dates: 11/9/2015 - 11/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.50E-02 0.00E+00 1.50E-02 Cs-134 <1.35E-02 0.00E+00 1.35E-02 Cs-137 <1.46E-02 0.00E+00 1.46E-02 Be-7 <1.03E-01 0.00E+00 1.03E-01 K-40 5.74E-01 2.09E-01 4.86E-02 Sample ID: 395688 Sample Dates: 11/16/2015 - 11/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <3.01E-02 0.00E+00 3.01E-02 Cs-134 <9.52E-03 0.00E+00 9.52E-03 Cs-137 <1.43E-02 0.00E+00 1.43E-02 Be-7 <8.27E-02 0.00E+00 8.27E-02 K-40 7.00E-01 2.46E-01 1.97E-01 Sample ID: 396181 Sample Dates: 11/23/2015 - 11/30/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.16E-03 0.00E+00 8.16E-03 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 36 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 396181 Sample Dates: 11/23/2015 - 11/30/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <7.81E-03 0.00E+00 7.81E-03 Cs-137 <9.70E-03 0.00E+00 9.70E-03 Be-7 <5.20E-02 0.00E+00 5.20E-02 K-40 3.58E-01 1.27E-01 2.85E-02 Sample ID: 396698 Sample Dates: 11/30/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.66E-02 0.00E+00 1.66E-02 Cs-134 <1.58E-02 0.00E+00 1.58E-02 Cs-137 <1.00E-02 0.00E+00 1.00E-02 Be-7 <1.07E-01 0.00E+00 1.07E-01 K-40 <4.84E-01 0.00E+00 4.84E-01 Sample ID: 397243 Sample Dates: 12/7/2015 - 12/14/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.50E-03 0.00E+00 8.50E-03 Cs-134 <8.35E-03 0.00E+00 8.35E-03 Cs-137 <1.04E-02 0.00E+00 1.04E-02 Be-7 <5.86E-02 0.00E+00 5.86E-02 K-40 <2.86E-01 0.00E+00 2.86E-01 Sample ID: 397953 Sample Dates: 12/14/2015 - 12/21/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.22E-03 0.00E+00 6.22E-03 Cs-134 <6.37E-03 0.00E+00 6.37E-03 Cs-137 <8.52E-03 0.00E+00 8.52E-03 Be-7 <3.64E-02 0.00E+00 3.64E-02 K-40 4.68E-01 1.46E-01 2.82E-02 Sample ID: 398342 Sample Dates: 12/21/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.01E-02 0.00E+00 1.01E-02 Cs-134 <9.06E-03 0.00E+00 9.06E-03 Cs-137 <8.14E-03 0.00E+00 8.14E-03 Be-7 <6.01E-02 0.00E+00 6.01E-02 K-40 <1.38E-01 0.00E+00 1.38E-01 Sample Point 084 [ INDICATOR - NNE @ 2.58 miles ]

Sample ID: 364942 Sample Dates: 12/29/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.33E-02 0.00E+00 1.33E-02 Cs-134 <1.31E-02 0.00E+00 1.31E-02 Cs-137 <1.71E-02 0.00E+00 1.71E-02 Be-7 <9.91E-02 0.00E+00 9.91E-02 K-40 4.52E-01 2.18E-01 2.47E-01 Sample ID: 365138 Sample Dates: 1/5/2015 - 1/12/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.47E-02 0.00E+00 1.47E-02 Cs-134 <1.27E-02 0.00E+00 1.27E-02 Cs-137 <1.46E-02 0.00E+00 1.46E-02 Be-7 <1.16E-01 0.00E+00 1.16E-01 K-40 5.77E-01 2.09E-01 4.88E-02 Sample ID: 365365 Sample Dates: 1/12/2015 - 1/19/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.04E-02 0.00E+00 1.04E-02 Cs-134 <7.03E-03 0.00E+00 7.03E-03 Cs-137 <5.75E-03 0.00E+00 5.75E-03 Be-7 <4.28E-02 0.00E+00 4.28E-02 K-40 3.84E-01 1.30E-01 2.81E-02 Sample ID: 366709 Sample Dates: 1/19/2015 - 1/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.04E-02 0.00E+00 2.04E-02 Cs-134 <1.57E-02 0.00E+00 1.57E-02 Cs-137 <1.03E-02 0.00E+00 1.03E-02 Be-7 <1.13E-01 0.00E+00 1.13E-01 K-40 <5.24E-01 0.00E+00 5.24E-01 Sample ID: 367124 Sample Dates: 1/26/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.65E-02 0.00E+00 1.65E-02 Cs-134 <1.30E-02 0.00E+00 1.30E-02 Cs-137 <1.11E-02 0.00E+00 1.11E-02 Be-7 <1.02E-01 0.00E+00 1.02E-01 K-40 4.45E-01 2.62E-01 3.07E-01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 37 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 367617 Sample Dates: 2/2/2015 - 2/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.02E-02 0.00E+00 1.02E-02 Cs-134 <5.91E-03 0.00E+00 5.91E-03 Cs-137 <7.99E-03 0.00E+00 7.99E-03 Be-7 <5.73E-02 0.00E+00 5.73E-02 K-40 4.11E-01 1.52E-01 1.41E-01 Sample ID: 369038 Sample Dates: 2/9/2015 - 2/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.88E-02 0.00E+00 1.88E-02 Cs-134 <9.13E-03 0.00E+00 9.13E-03 Cs-137 <2.33E-02 0.00E+00 2.33E-02 Be-7 <1.36E-01 0.00E+00 1.36E-01 K-40 4.80E-01 2.82E-01 3.39E-01 Sample ID: 369750 Sample Dates: 2/16/2015 - 2/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.77E-02 0.00E+00 1.77E-02 Cs-134 <1.41E-02 0.00E+00 1.41E-02 Cs-137 <1.44E-02 0.00E+00 1.44E-02 Be-7 <7.80E-02 0.00E+00 7.80E-02 K-40 5.49E-01 2.02E-01 4.80E-02 Sample ID: 370665 Sample Dates: 2/23/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <5.60E-03 0.00E+00 5.60E-03 Cs-134 <5.77E-03 0.00E+00 5.77E-03 Cs-137 <8.41E-03 0.00E+00 8.41E-03 Be-7 <6.19E-02 0.00E+00 6.19E-02 K-40 4.01E-01 1.54E-01 1.55E-01 Sample ID: 371612 Sample Dates: 3/2/2015 - 3/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.06E-02 0.00E+00 1.06E-02 Cs-134 <6.53E-03 0.00E+00 6.53E-03 Cs-137 <1.01E-02 0.00E+00 1.01E-02 Be-7 <6.60E-02 0.00E+00 6.60E-02 K-40 3.32E-01 1.36E-01 1.15E-01 Sample ID: 371978 Sample Dates: 3/9/2015 - 3/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.54E-03 0.00E+00 8.54E-03 Cs-134 <5.38E-03 0.00E+00 5.38E-03 Cs-137 <8.14E-03 0.00E+00 8.14E-03 Be-7 <1.09E-02 0.00E+00 1.09E-02 K-40 3.91E-01 1.45E-01 1.28E-01 Sample ID: 372461 Sample Dates: 3/16/2015 - 3/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.90E-03 0.00E+00 6.90E-03 Cs-134 <5.40E-03 0.00E+00 5.40E-03 Cs-137 <8.17E-03 0.00E+00 8.17E-03 Be-7 <6.68E-02 0.00E+00 6.68E-02 K-40 <2.83E-01 0.00E+00 2.83E-01 Sample ID: 373920 Sample Dates: 3/23/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.09E-03 0.00E+00 6.09E-03 Cs-134 <4.58E-03 0.00E+00 4.58E-03 Cs-137 <5.70E-03 0.00E+00 5.70E-03 Be-7 <4.24E-02 0.00E+00 4.24E-02 K-40 <3.20E-01 0.00E+00 3.20E-01 Sample ID: 374618 Sample Dates: 3/30/2015 - 4/6/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.61E-02 0.00E+00 1.61E-02 Cs-134 <1.27E-02 0.00E+00 1.27E-02 Cs-137 <1.56E-02 0.00E+00 1.56E-02 Be-7 <1.18E-01 0.00E+00 1.18E-01 K-40 5.91E-01 2.29E-01 1.94E-01 Sample ID: 375005 Sample Dates: 4/6/2015 - 4/13/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.81E-02 0.00E+00 1.81E-02 Cs-134 <1.17E-02 0.00E+00 1.17E-02 Cs-137 <1.55E-02 0.00E+00 1.55E-02 Be-7 <1.01E-01 0.00E+00 1.01E-01 K-40 4.88E-01 2.37E-01 2.79E-01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 38 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 375686 Sample Dates: 4/13/2015 - 4/20/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.81E-02 0.00E+00 1.81E-02 Cs-134 <1.42E-02 0.00E+00 1.42E-02 Cs-137 <1.19E-02 0.00E+00 1.19E-02 Be-7 <9.45E-02 0.00E+00 9.45E-02 K-40 4.28E-01 2.17E-01 2.52E-01 Sample ID: 376893 Sample Dates: 4/20/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.36E-03 0.00E+00 7.36E-03 Cs-134 <6.25E-03 0.00E+00 6.25E-03 Cs-137 <7.12E-03 0.00E+00 7.12E-03 Be-7 <5.42E-02 0.00E+00 5.42E-02 K-40 3.26E-01 1.19E-01 2.76E-02 Sample ID: 377552 Sample Dates: 4/27/2015 - 5/4/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.66E-02 0.00E+00 1.66E-02 Cs-134 <9.74E-03 0.00E+00 9.74E-03 Cs-137 <1.34E-02 0.00E+00 1.34E-02 Be-7 <8.77E-02 0.00E+00 8.77E-02 K-40 6.80E-01 2.65E-01 2.70E-01 Sample ID: 378126 Sample Dates: 5/4/2015 - 5/11/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.79E-02 0.00E+00 1.79E-02 Cs-134 <1.60E-02 0.00E+00 1.60E-02 Cs-137 <1.54E-02 0.00E+00 1.54E-02 Be-7 <1.19E-01 0.00E+00 1.19E-01 K-40 5.18E-01 2.09E-01 1.69E-01 Sample ID: 378525 Sample Dates: 5/11/2015 - 5/18/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.39E-02 0.00E+00 1.39E-02 Cs-134 <1.26E-02 0.00E+00 1.26E-02 Cs-137 <1.45E-02 0.00E+00 1.45E-02 Be-7 <9.47E-02 0.00E+00 9.47E-02 K-40 5.85E-01 2.30E-01 2.04E-01 Sample ID: 379015 Sample Dates: 5/18/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.87E-03 0.00E+00 8.87E-03 Cs-134 <6.57E-03 0.00E+00 6.57E-03 Cs-137 <8.56E-03 0.00E+00 8.56E-03 Be-7 <4.41E-02 0.00E+00 4.41E-02 K-40 3.54E-01 1.23E-01 8.92E-02 Sample ID: 379518 Sample Dates: 5/26/2015 - 6/1/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.13E-02 0.00E+00 2.13E-02 Cs-134 <1.47E-02 0.00E+00 1.47E-02 Cs-137 <1.55E-02 0.00E+00 1.55E-02 Be-7 <1.10E-01 0.00E+00 1.10E-01 K-40 8.98E-01 2.84E-01 5.66E-02 Sample ID: 380265 Sample Dates: 6/1/2015 - 6/8/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.12E-02 0.00E+00 2.12E-02 Cs-134 <1.55E-02 0.00E+00 1.55E-02 Cs-137 <1.74E-02 0.00E+00 1.74E-02 Be-7 <8.72E-02 0.00E+00 8.72E-02 K-40 5.67E-01 2.40E-01 2.50E-01 Sample ID: 380539 Sample Dates: 6/8/2015 - 6/15/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.58E-02 0.00E+00 1.58E-02 Cs-134 <1.34E-02 0.00E+00 1.34E-02 Cs-137 <1.66E-02 0.00E+00 1.66E-02 Be-7 <7.86E-02 0.00E+00 7.86E-02 K-40 6.79E-01 2.27E-01 4.84E-02 Sample ID: 380865 Sample Dates: 6/15/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.94E-03 0.00E+00 8.94E-03 Cs-134 <6.96E-03 0.00E+00 6.96E-03 Cs-137 <5.71E-03 0.00E+00 5.71E-03 Be-7 <5.91E-02 0.00E+00 5.91E-02 K-40 <3.08E-01 0.00E+00 3.08E-01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 39 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 381332 Sample Dates: 6/22/2015 - 6/29/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.90E-02 0.00E+00 1.90E-02 Cs-134 <1.43E-02 0.00E+00 1.43E-02 Cs-137 <1.67E-02 0.00E+00 1.67E-02 Be-7 <9.53E-02 0.00E+00 9.53E-02 K-40 6.69E-01 2.46E-01 2.08E-01 Sample ID: 381658 Sample Dates: 6/29/2015 - 7/6/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.38E-02 0.00E+00 1.38E-02 Cs-134 <1.16E-02 0.00E+00 1.16E-02 Cs-137 <1.31E-02 0.00E+00 1.31E-02 Be-7 <1.14E-01 0.00E+00 1.14E-01 K-40 5.48E-01 2.02E-01 4.79E-02 Sample ID: 382227 Sample Dates: 7/6/2015 - 7/13/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.89E-03 0.00E+00 7.89E-03 Cs-134 <8.34E-03 0.00E+00 8.34E-03 Cs-137 <8.93E-03 0.00E+00 8.93E-03 Be-7 <5.05E-02 0.00E+00 5.05E-02 K-40 4.06E-01 1.45E-01 1.18E-01 Sample ID: 382651 Sample Dates: 7/13/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.56E-03 0.00E+00 8.56E-03 Cs-134 <4.63E-03 0.00E+00 4.63E-03 Cs-137 <5.76E-03 0.00E+00 5.76E-03 Be-7 <5.61E-02 0.00E+00 5.61E-02 K-40 <2.61E-01 0.00E+00 2.61E-01 Sample ID: 383578 Sample Dates: 7/20/2015 - 7/27/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.47E-03 0.00E+00 7.47E-03 Cs-134 <7.61E-03 0.00E+00 7.61E-03 Cs-137 <9.98E-03 0.00E+00 9.98E-03 Be-7 <6.81E-02 0.00E+00 6.81E-02 K-40 <3.09E-01 0.00E+00 3.09E-01 Sample ID: 384152 Sample Dates: 7/27/2015 - 8/3/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.56E-02 0.00E+00 1.56E-02 Cs-134 <1.41E-02 0.00E+00 1.41E-02 Cs-137 <1.54E-02 0.00E+00 1.54E-02 Be-7 <1.01E-01 0.00E+00 1.01E-01 K-40 5.46E-01 2.22E-01 2.00E-01 Sample ID: 384720 Sample Dates: 8/3/2015 - 8/10/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.35E-02 0.00E+00 1.35E-02 Cs-134 <1.49E-02 0.00E+00 1.49E-02 Cs-137 <2.00E-02 0.00E+00 2.00E-02 Be-7 <1.09E-01 0.00E+00 1.09E-01 K-40 5.60E-01 2.17E-01 1.67E-01 Sample ID: 385471 Sample Dates: 8/10/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.43E-02 0.00E+00 1.43E-02 Cs-134 <1.15E-02 0.00E+00 1.15E-02 Cs-137 <1.72E-02 0.00E+00 1.72E-02 Be-7 <8.58E-02 0.00E+00 8.58E-02 K-40 7.48E-01 2.55E-01 2.01E-01 Sample ID: 385987 Sample Dates: 8/17/2015 - 8/24/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.23E-03 0.00E+00 8.23E-03 Cs-134 <7.18E-03 0.00E+00 7.18E-03 Cs-137 <7.60E-03 0.00E+00 7.60E-03 Be-7 <5.72E-02 0.00E+00 5.72E-02 K-40 2.97E-01 1.15E-01 2.88E-02 Sample ID: 386884 Sample Dates: 8/24/2015 - 8/31/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.55E-02 0.00E+00 1.55E-02 Cs-134 <1.61E-02 0.00E+00 1.61E-02 Cs-137 <1.32E-02 0.00E+00 1.32E-02 Be-7 <1.14E-01 0.00E+00 1.14E-01 K-40 5.68E-01 2.28E-01 2.08E-01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 40 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 387468 Sample Dates: 8/31/2015 - 9/8/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.90E-03 0.00E+00 7.90E-03 Cs-134 <4.70E-03 0.00E+00 4.70E-03 Cs-137 <8.14E-03 0.00E+00 8.14E-03 Be-7 <4.22E-02 0.00E+00 4.22E-02 K-40 2.54E-01 1.21E-01 1.40E-01 Sample ID: 388825 Sample Dates: 9/8/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.81E-03 0.00E+00 8.81E-03 Cs-134 <1.04E-02 0.00E+00 1.04E-02 Cs-137 <7.41E-03 0.00E+00 7.41E-03 Be-7 <3.26E-02 0.00E+00 3.26E-02 K-40 6.01E-01 1.88E-01 1.35E-01 Sample ID: 389467 Sample Dates: 9/14/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.59E-02 0.00E+00 1.59E-02 Cs-134 <1.48E-02 0.00E+00 1.48E-02 Cs-137 <1.44E-02 0.00E+00 1.44E-02 Be-7 <1.09E-01 0.00E+00 1.09E-01 K-40 4.63E-01 2.05E-01 1.91E-01 Sample ID: 390070 Sample Dates: 9/21/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.58E-02 0.00E+00 1.58E-02 Cs-134 <1.34E-02 0.00E+00 1.34E-02 Cs-137 <1.03E-02 0.00E+00 1.03E-02 Be-7 <1.02E-01 0.00E+00 1.02E-01 K-40 6.49E-01 2.35E-01 1.74E-01 Sample ID: 390702 Sample Dates: 9/28/2015 - 10/5/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.07E-02 0.00E+00 2.07E-02 Cs-134 <1.55E-02 0.00E+00 1.55E-02 Cs-137 <1.92E-02 0.00E+00 1.92E-02 Be-7 <1.03E-01 0.00E+00 1.03E-01 K-40 4.40E-01 2.10E-01 2.25E-01 Sample ID: 392015 Sample Dates: 10/5/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.96E-02 0.00E+00 1.96E-02 Cs-134 <1.14E-02 0.00E+00 1.14E-02 Cs-137 <1.29E-02 0.00E+00 1.29E-02 Be-7 <1.13E-01 0.00E+00 1.13E-01 K-40 4.07E-01 2.06E-01 2.36E-01 Sample ID: 392289 Sample Dates: 10/12/2015 - 10/19/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.41E-02 0.00E+00 1.41E-02 Cs-134 <1.29E-02 0.00E+00 1.29E-02 Cs-137 <1.59E-02 0.00E+00 1.59E-02 Be-7 <1.29E-01 0.00E+00 1.29E-01 K-40 <5.06E-01 0.00E+00 5.06E-01 Sample ID: 393490 Sample Dates: 10/19/2015 - 10/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.13E-02 0.00E+00 2.13E-02 Cs-134 <1.47E-02 0.00E+00 1.47E-02 Cs-137 <1.43E-02 0.00E+00 1.43E-02 Be-7 <9.35E-02 0.00E+00 9.35E-02 K-40 <4.98E-01 0.00E+00 4.98E-01 Sample ID: 393888 Sample Dates: 10/26/2015 - 11/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.25E-02 0.00E+00 1.25E-02 Cs-134 <1.41E-02 0.00E+00 1.41E-02 Cs-137 <1.65E-02 0.00E+00 1.65E-02 Be-7 <9.40E-02 0.00E+00 9.40E-02 K-40 5.65E-01 2.24E-01 1.96E-01 Sample ID: 394908 Sample Dates: 11/2/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.11E-02 0.00E+00 1.11E-02 Cs-134 <5.80E-03 0.00E+00 5.80E-03 Cs-137 <7.20E-03 0.00E+00 7.20E-03 Be-7 <4.70E-02 0.00E+00 4.70E-02 K-40 <2.66E-01 0.00E+00 2.66E-01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 41 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 395362 Sample Dates: 11/9/2015 - 11/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.59E-02 0.00E+00 1.59E-02 Cs-134 <1.50E-02 0.00E+00 1.50E-02 Cs-137 <1.03E-02 0.00E+00 1.03E-02 Be-7 <1.03E-01 0.00E+00 1.03E-01 K-40 7.18E-01 2.35E-01 4.86E-02 Sample ID: 395689 Sample Dates: 11/16/2015 - 11/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.28E-02 0.00E+00 2.28E-02 Cs-134 <1.41E-02 0.00E+00 1.41E-02 Cs-137 <1.64E-02 0.00E+00 1.64E-02 Be-7 <1.16E-01 0.00E+00 1.16E-01 K-40 5.82E-01 2.08E-01 4.78E-02 Sample ID: 396182 Sample Dates: 11/23/2015 - 11/30/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.24E-02 0.00E+00 1.24E-02 Cs-134 <7.74E-03 0.00E+00 7.74E-03 Cs-137 <8.94E-03 0.00E+00 8.94E-03 Be-7 <5.29E-02 0.00E+00 5.29E-02 K-40 4.26E-01 1.55E-01 1.22E-01 Sample ID: 396699 Sample Dates: 11/30/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.65E-02 0.00E+00 1.65E-02 Cs-134 <1.38E-02 0.00E+00 1.38E-02 Cs-137 <1.16E-02 0.00E+00 1.16E-02 Be-7 <9.34E-02 0.00E+00 9.34E-02 K-40 4.74E-01 2.01E-01 1.73E-01 Sample ID: 397244 Sample Dates: 12/7/2015 - 12/14/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.46E-03 0.00E+00 7.46E-03 Cs-134 <8.11E-03 0.00E+00 8.11E-03 Cs-137 <7.63E-03 0.00E+00 7.63E-03 Be-7 <6.54E-02 0.00E+00 6.54E-02 K-40 5.15E-01 1.56E-01 2.91E-02 Sample ID: 397954 Sample Dates: 12/14/2015 - 12/21/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.06E-02 0.00E+00 1.06E-02 Cs-134 <8.16E-03 0.00E+00 8.16E-03 Cs-137 <1.32E-02 0.00E+00 1.32E-02 Be-7 <4.06E-02 0.00E+00 4.06E-02 K-40 2.96E-01 1.19E-01 3.09E-02 Sample ID: 398343 Sample Dates: 12/21/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.58E-03 0.00E+00 8.58E-03 Cs-134 <7.61E-03 0.00E+00 7.61E-03 Cs-137 <4.38E-03 0.00E+00 4.38E-03 Be-7 <3.60E-02 0.00E+00 3.60E-02 K-40 4.04E-01 1.46E-01 1.24E-01 Sample Point 085 [ INDICATOR - NNW @ 0.88 miles ]

Sample ID: 364943 Sample Dates: 12/29/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.70E-02 0.00E+00 1.70E-02 Cs-134 <1.05E-02 0.00E+00 1.05E-02 Cs-137 <1.81E-02 0.00E+00 1.81E-02 Be-7 <9.98E-02 0.00E+00 9.98E-02 K-40 6.88E-01 2.39E-01 1.70E-01 Sample ID: 365139 Sample Dates: 1/5/2015 - 1/12/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.74E-02 0.00E+00 1.74E-02 Cs-134 <1.08E-02 0.00E+00 1.08E-02 Cs-137 <1.57E-02 0.00E+00 1.57E-02 Be-7 <9.53E-02 0.00E+00 9.53E-02 K-40 5.26E-01 2.48E-01 2.92E-01 Sample ID: 365366 Sample Dates: 1/12/2015 - 1/19/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.20E-02 0.00E+00 2.20E-02 Cs-134 <9.08E-03 0.00E+00 9.08E-03 Cs-137 <1.66E-02 0.00E+00 1.66E-02 Be-7 <1.52E-01 0.00E+00 1.52E-01 K-40 5.76E-01 2.74E-01 2.45E-01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 42 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 366710 Sample Dates: 1/19/2015 - 1/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.08E-02 0.00E+00 1.08E-02 Cs-134 <6.93E-03 0.00E+00 6.93E-03 Cs-137 <1.08E-02 0.00E+00 1.08E-02 Be-7 <6.45E-02 0.00E+00 6.45E-02 K-40 4.26E-01 1.61E-01 1.29E-01 Sample ID: 367125 Sample Dates: 1/26/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.41E-02 0.00E+00 1.41E-02 Cs-134 <9.29E-03 0.00E+00 9.29E-03 Cs-137 <1.28E-02 0.00E+00 1.28E-02 Be-7 <1.16E-01 0.00E+00 1.16E-01 K-40 7.21E-01 2.48E-01 1.98E-01 Sample ID: 367618 Sample Dates: 2/2/2015 - 2/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.03E-02 0.00E+00 1.03E-02 Cs-134 <6.75E-03 0.00E+00 6.75E-03 Cs-137 <8.39E-03 0.00E+00 8.39E-03 Be-7 <6.66E-02 0.00E+00 6.66E-02 K-40 3.97E-01 1.47E-01 1.28E-01 Sample ID: 369039 Sample Dates: 2/9/2015 - 2/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.87E-03 0.00E+00 7.87E-03 Cs-134 <7.99E-03 0.00E+00 7.99E-03 Cs-137 <7.58E-03 0.00E+00 7.58E-03 Be-7 <6.40E-02 0.00E+00 6.40E-02 K-40 <3.86E-01 0.00E+00 3.86E-01 Sample ID: 369751 Sample Dates: 2/16/2015 - 2/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.11E-02 0.00E+00 1.11E-02 Cs-134 <1.43E-02 0.00E+00 1.43E-02 Cs-137 <1.87E-02 0.00E+00 1.87E-02 Be-7 <1.02E-01 0.00E+00 1.02E-01 K-40 6.84E-01 2.35E-01 5.15E-02 Sample ID: 370666 Sample Dates: 2/23/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.90E-03 0.00E+00 7.90E-03 Cs-134 <8.00E-03 0.00E+00 8.00E-03 Cs-137 <7.16E-03 0.00E+00 7.16E-03 Be-7 <6.50E-02 0.00E+00 6.50E-02 K-40 4.50E-01 1.52E-01 1.18E-01 Sample ID: 371613 Sample Dates: 3/2/2015 - 3/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.44E-03 0.00E+00 7.44E-03 Cs-134 <5.49E-03 0.00E+00 5.49E-03 Cs-137 <7.61E-03 0.00E+00 7.61E-03 Be-7 <4.92E-02 0.00E+00 4.92E-02 K-40 4.46E-01 1.52E-01 1.14E-01 Sample ID: 371979 Sample Dates: 3/9/2015 - 3/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.89E-03 0.00E+00 7.89E-03 Cs-134 <7.71E-03 0.00E+00 7.71E-03 Cs-137 <5.60E-03 0.00E+00 5.60E-03 Be-7 <5.92E-02 0.00E+00 5.92E-02 K-40 4.36E-01 1.40E-01 2.81E-02 Sample ID: 372462 Sample Dates: 3/16/2015 - 3/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.17E-03 0.00E+00 6.17E-03 Cs-134 <8.34E-03 0.00E+00 8.34E-03 Cs-137 <6.70E-03 0.00E+00 6.70E-03 Be-7 <5.64E-02 0.00E+00 5.64E-02 K-40 3.68E-01 1.39E-01 1.14E-01 Sample ID: 373921 Sample Dates: 3/23/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.40E-03 0.00E+00 8.40E-03 Cs-134 <6.74E-03 0.00E+00 6.74E-03 Cs-137 <6.39E-03 0.00E+00 6.39E-03 Be-7 <4.62E-02 0.00E+00 4.62E-02 K-40 3.07E-01 1.15E-01 2.77E-02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 43 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 374619 Sample Dates: 3/30/2015 - 4/6/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.93E-02 0.00E+00 1.93E-02 Cs-134 <1.17E-02 0.00E+00 1.17E-02 Cs-137 <1.45E-02 0.00E+00 1.45E-02 Be-7 <1.39E-01 0.00E+00 1.39E-01 K-40 7.29E-01 2.36E-01 4.82E-02 Sample ID: 375006 Sample Dates: 4/6/2015 - 4/13/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.47E-02 0.00E+00 1.47E-02 Cs-134 <1.50E-02 0.00E+00 1.50E-02 Cs-137 <1.03E-02 0.00E+00 1.03E-02 Be-7 <8.72E-02 0.00E+00 8.72E-02 K-40 6.65E-01 2.42E-01 1.93E-01 Sample ID: 375687 Sample Dates: 4/13/2015 - 4/20/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.80E-02 0.00E+00 1.80E-02 Cs-134 <1.25E-02 0.00E+00 1.25E-02 Cs-137 <1.18E-02 0.00E+00 1.18E-02 Be-7 <9.41E-02 0.00E+00 9.41E-02 K-40 5.15E-01 2.31E-01 2.51E-01 Sample ID: 376894 Sample Dates: 4/20/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.06E-02 0.00E+00 1.06E-02 Cs-134 <6.92E-03 0.00E+00 6.92E-03 Cs-137 <8.60E-03 0.00E+00 8.60E-03 Be-7 <5.15E-02 0.00E+00 5.15E-02 K-40 4.02E-01 1.34E-01 2.79E-02 Sample ID: 377553 Sample Dates: 4/27/2015 - 5/4/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.17E-02 0.00E+00 2.17E-02 Cs-134 <1.28E-02 0.00E+00 1.28E-02 Cs-137 <1.20E-02 0.00E+00 1.20E-02 Be-7 <8.76E-02 0.00E+00 8.76E-02 K-40 5.05E-01 2.32E-01 2.56E-01 Sample ID: 378127 Sample Dates: 5/4/2015 - 5/11/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.62E-02 0.00E+00 1.62E-02 Cs-134 <1.40E-02 0.00E+00 1.40E-02 Cs-137 <1.31E-02 0.00E+00 1.31E-02 Be-7 <9.31E-02 0.00E+00 9.31E-02 K-40 4.92E-01 1.90E-01 4.76E-02 Sample ID: 378526 Sample Dates: 5/11/2015 - 5/18/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.39E-02 0.00E+00 1.39E-02 Cs-134 <1.17E-02 0.00E+00 1.17E-02 Cs-137 <1.76E-02 0.00E+00 1.76E-02 Be-7 <5.33E-02 0.00E+00 5.33E-02 K-40 5.72E-01 2.08E-01 4.84E-02 Sample ID: 379016 Sample Dates: 5/18/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.65E-03 0.00E+00 6.65E-03 Cs-134 <6.06E-03 0.00E+00 6.06E-03 Cs-137 <9.56E-03 0.00E+00 9.56E-03 Be-7 <6.20E-02 0.00E+00 6.20E-02 K-40 3.97E-01 1.37E-01 1.01E-01 Sample ID: 379519 Sample Dates: 5/26/2015 - 6/1/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.65E-02 0.00E+00 1.65E-02 Cs-134 <1.47E-02 0.00E+00 1.47E-02 Cs-137 <1.39E-02 0.00E+00 1.39E-02 Be-7 <1.26E-01 0.00E+00 1.26E-01 K-40 <5.70E-01 0.00E+00 5.70E-01 Sample ID: 380266 Sample Dates: 6/1/2015 - 6/8/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.97E-02 0.00E+00 1.97E-02 Cs-134 <9.59E-03 0.00E+00 9.59E-03 Cs-137 <1.32E-02 0.00E+00 1.32E-02 Be-7 <8.74E-02 0.00E+00 8.74E-02 K-40 3.97E-01 2.06E-01 2.37E-01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 44 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 380540 Sample Dates: 6/8/2015 - 6/15/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.46E-02 0.00E+00 1.46E-02 Cs-134 <1.42E-02 0.00E+00 1.42E-02 Cs-137 <1.33E-02 0.00E+00 1.33E-02 Be-7 <1.27E-01 0.00E+00 1.27E-01 K-40 8.56E-01 2.57E-01 4.83E-02 Sample ID: 380866 Sample Dates: 6/15/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.40E-03 0.00E+00 8.40E-03 Cs-134 <5.76E-03 0.00E+00 5.76E-03 Cs-137 <8.40E-03 0.00E+00 8.40E-03 Be-7 <7.26E-02 0.00E+00 7.26E-02 K-40 3.18E-01 1.18E-01 2.78E-02 Sample ID: 381333 Sample Dates: 6/22/2015 - 6/29/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.09E-02 0.00E+00 2.09E-02 Cs-134 <9.66E-03 0.00E+00 9.66E-03 Cs-137 <1.46E-02 0.00E+00 1.46E-02 Be-7 <1.02E-01 0.00E+00 1.02E-01 K-40 5.85E-01 2.38E-01 2.30E-01 Sample ID: 381659 Sample Dates: 6/29/2015 - 7/6/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.68E-02 0.00E+00 1.68E-02 Cs-134 <1.61E-02 0.00E+00 1.61E-02 Cs-137 <1.74E-02 0.00E+00 1.74E-02 Be-7 <8.64E-02 0.00E+00 8.64E-02 K-40 5.93E-01 2.23E-01 1.69E-01 Sample ID: 382228 Sample Dates: 7/6/2015 - 7/13/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.33E-03 0.00E+00 7.33E-03 Cs-134 <6.72E-03 0.00E+00 6.72E-03 Cs-137 <9.86E-03 0.00E+00 9.86E-03 Be-7 <4.14E-02 0.00E+00 4.14E-02 K-40 3.95E-01 1.50E-01 1.47E-01 Sample ID: 382652 Sample Dates: 7/13/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.36E-03 0.00E+00 7.36E-03 Cs-134 <4.94E-03 0.00E+00 4.94E-03 Cs-137 <6.14E-03 0.00E+00 6.14E-03 Be-7 <5.58E-02 0.00E+00 5.58E-02 K-40 3.23E-01 1.23E-01 3.02E-02 Sample ID: 383579 Sample Dates: 7/20/2015 - 7/27/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.01E-03 0.00E+00 8.01E-03 Cs-134 <9.46E-03 0.00E+00 9.46E-03 Cs-137 <7.23E-03 0.00E+00 7.23E-03 Be-7 <4.26E-02 0.00E+00 4.26E-02 K-40 3.86E-01 1.38E-01 9.89E-02 Sample ID: 384153 Sample Dates: 7/27/2015 - 8/3/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.24E-02 0.00E+00 1.24E-02 Cs-134 <1.33E-02 0.00E+00 1.33E-02 Cs-137 <8.06E-03 0.00E+00 8.06E-03 Be-7 <9.38E-02 0.00E+00 9.38E-02 K-40 4.81E-01 2.43E-01 3.00E-01 Sample ID: 384721 Sample Dates: 8/3/2015 - 8/10/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.35E-02 0.00E+00 1.35E-02 Cs-134 <1.26E-02 0.00E+00 1.26E-02 Cs-137 <1.33E-02 0.00E+00 1.33E-02 Be-7 <8.75E-02 0.00E+00 8.75E-02 K-40 6.41E-01 2.37E-01 1.95E-01 Sample ID: 385472 Sample Dates: 8/10/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.73E-02 0.00E+00 1.73E-02 Cs-134 <1.15E-02 0.00E+00 1.15E-02 Cs-137 <2.04E-02 0.00E+00 2.04E-02 Be-7 <1.01E-01 0.00E+00 1.01E-01 K-40 <4.38E-01 0.00E+00 4.38E-01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 45 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 385988 Sample Dates: 8/17/2015 - 8/24/2015 Nuclide Activity 2 Sigma Error MDA I-131 <6.96E-03 0.00E+00 6.96E-03 Cs-134 <7.42E-03 0.00E+00 7.42E-03 Cs-137 <9.22E-03 0.00E+00 9.22E-03 Be-7 <5.61E-02 0.00E+00 5.61E-02 K-40 3.46E-01 1.38E-01 1.24E-01 Sample ID: 386885 Sample Dates: 8/24/2015 - 8/31/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.86E-02 0.00E+00 1.86E-02 Cs-134 <1.48E-02 0.00E+00 1.48E-02 Cs-137 <1.74E-02 0.00E+00 1.74E-02 Be-7 <1.25E-01 0.00E+00 1.25E-01 K-40 3.66E-01 1.95E-01 2.22E-01 Sample ID: 387469 Sample Dates: 8/31/2015 - 9/8/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.28E-03 0.00E+00 8.28E-03 Cs-134 <6.01E-03 0.00E+00 6.01E-03 Cs-137 <7.46E-03 0.00E+00 7.46E-03 Be-7 <5.75E-02 0.00E+00 5.75E-02 K-40 3.19E-01 1.11E-01 2.47E-02 Sample ID: 388826 Sample Dates: 9/8/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA I-131 <4.60E-03 0.00E+00 4.60E-03 Cs-134 <8.30E-03 0.00E+00 8.30E-03 Cs-137 <8.24E-03 0.00E+00 8.24E-03 Be-7 <6.66E-02 0.00E+00 6.66E-02 K-40 4.46E-01 1.61E-01 1.29E-01 Sample ID: 389468 Sample Dates: 9/14/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.21E-02 0.00E+00 1.21E-02 Cs-134 <1.07E-02 0.00E+00 1.07E-02 Cs-137 <1.44E-02 0.00E+00 1.44E-02 Be-7 <1.09E-01 0.00E+00 1.09E-01 K-40 4.86E-01 2.36E-01 2.81E-01 Sample ID: 390071 Sample Dates: 9/21/2015 - 9/28/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.83E-02 0.00E+00 1.83E-02 Cs-134 <1.56E-02 0.00E+00 1.56E-02 Cs-137 <1.03E-02 0.00E+00 1.03E-02 Be-7 <1.09E-01 0.00E+00 1.09E-01 K-40 5.91E-01 2.11E-01 4.85E-02 Sample ID: 390703 Sample Dates: 9/28/2015 - 10/5/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.61E-02 0.00E+00 1.61E-02 Cs-134 <1.55E-02 0.00E+00 1.55E-02 Cs-137 <1.19E-02 0.00E+00 1.19E-02 Be-7 <8.76E-02 0.00E+00 8.76E-02 K-40 5.18E-01 2.13E-01 1.84E-01 Sample ID: 392016 Sample Dates: 10/5/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA I-131 <2.43E-02 0.00E+00 2.43E-02 Cs-134 <1.30E-02 0.00E+00 1.30E-02 Cs-137 <1.40E-02 0.00E+00 1.40E-02 Be-7 <9.37E-02 0.00E+00 9.37E-02 K-40 4.80E-01 2.28E-01 2.64E-01 Sample ID: 392290 Sample Dates: 10/12/2015 - 10/19/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.41E-02 0.00E+00 1.41E-02 Cs-134 <1.52E-02 0.00E+00 1.52E-02 Cs-137 <1.36E-02 0.00E+00 1.36E-02 Be-7 <1.04E-01 0.00E+00 1.04E-01 K-40 6.31E-01 2.75E-01 3.20E-01 Sample ID: 393491 Sample Dates: 10/19/2015 - 10/26/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.34E-02 0.00E+00 1.34E-02 Cs-134 <1.54E-02 0.00E+00 1.54E-02 Cs-137 <1.73E-02 0.00E+00 1.73E-02 Be-7 <9.32E-02 0.00E+00 9.32E-02 K-40 5.34E-01 2.12E-01 1.70E-01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 46 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 393889 Sample Dates: 10/26/2015 - 11/2/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.73E-02 0.00E+00 1.73E-02 Cs-134 <1.55E-02 0.00E+00 1.55E-02 Cs-137 <1.18E-02 0.00E+00 1.18E-02 Be-7 <1.14E-01 0.00E+00 1.14E-01 K-40 <5.37E-01 0.00E+00 5.37E-01 Sample ID: 394909 Sample Dates: 11/2/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.31E-02 0.00E+00 1.31E-02 Cs-134 <1.59E-02 0.00E+00 1.59E-02 Cs-137 <1.17E-02 0.00E+00 1.17E-02 Be-7 <1.07E-01 0.00E+00 1.07E-01 K-40 7.63E-01 2.58E-01 2.07E-01 Sample ID: 395363 Sample Dates: 11/9/2015 - 11/16/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.58E-02 0.00E+00 1.58E-02 Cs-134 <1.56E-02 0.00E+00 1.56E-02 Cs-137 <1.45E-02 0.00E+00 1.45E-02 Be-7 <9.50E-02 0.00E+00 9.50E-02 K-40 7.75E-01 2.56E-01 1.76E-01 Sample ID: 395690 Sample Dates: 11/16/2015 - 11/23/2015 Nuclide Activity 2 Sigma Error MDA I-131 <3.32E-02 0.00E+00 3.32E-02 Cs-134 <1.64E-02 0.00E+00 1.64E-02 Cs-137 <1.34E-02 0.00E+00 1.34E-02 Be-7 <1.11E-01 0.00E+00 1.11E-01 K-40 3.43E-01 2.06E-01 2.62E-01 Sample ID: 396183 Sample Dates: 11/23/2015 - 11/30/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.81E-02 0.00E+00 1.81E-02 Cs-134 <1.42E-02 0.00E+00 1.42E-02 Cs-137 <1.19E-02 0.00E+00 1.19E-02 Be-7 <9.45E-02 0.00E+00 9.45E-02 K-40 <4.20E-01 0.00E+00 4.20E-01 Sample ID: 396700 Sample Dates: 11/30/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA I-131 <1.65E-02 0.00E+00 1.65E-02 Cs-134 <1.45E-02 0.00E+00 1.45E-02 Cs-137 <1.52E-02 0.00E+00 1.52E-02 Be-7 <1.24E-01 0.00E+00 1.24E-01 K-40 6.95E-01 2.27E-01 4.71E-02 Sample ID: 397245 Sample Dates: 12/7/2015 - 12/14/2015 Nuclide Activity 2 Sigma Error MDA I-131 <7.33E-03 0.00E+00 7.33E-03 Cs-134 <7.36E-03 0.00E+00 7.36E-03 Cs-137 <9.13E-03 0.00E+00 9.13E-03 Be-7 <4.29E-02 0.00E+00 4.29E-02 K-40 4.06E-01 1.45E-01 1.16E-01 Sample ID: 397955 Sample Dates: 12/14/2015 - 12/21/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.14E-03 0.00E+00 8.14E-03 Cs-134 <8.14E-03 0.00E+00 8.14E-03 Cs-137 <9.11E-03 0.00E+00 9.11E-03 Be-7 <4.73E-02 0.00E+00 4.73E-02 K-40 3.92E-01 1.51E-01 1.46E-01 Sample ID: 398344 Sample Dates: 12/21/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.17E-03 0.00E+00 8.17E-03 Cs-134 <8.17E-03 0.00E+00 8.17E-03 Cs-137 <8.58E-03 0.00E+00 8.58E-03 Be-7 <5.18E-02 0.00E+00 5.18E-02 K-40 4.61E-01 1.45E-01 2.84E-02 Media Type: DRINKING WATER Concentration (Activity): pCi/l Sample Point 060 [ INDICATOR - NE @ 3.23 miles ]

Sample ID: 364787 Sample Dates: 12/8/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.01E+00 7.08E-01 1.15E+00 Mn-54 <2.93E+00 0.00E+00 2.93E+00 Co-58 <3.50E+00 0.00E+00 3.50E+00 Fe-59 <6.09E+00 0.00E+00 6.09E+00 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 47 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 364787 Sample Dates: 12/8/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA Co-60 <4.06E+00 0.00E+00 4.06E+00 Zn-65 <9.40E+00 0.00E+00 9.40E+00 Zr-95 <6.23E+00 0.00E+00 6.23E+00 Nb-95 <4.42E+00 0.00E+00 4.42E+00 I-131 <1.18E+01 0.00E+00 1.18E+01 Cs-134 <3.24E+00 0.00E+00 3.24E+00 Cs-137 <2.83E+00 0.00E+00 2.83E+00 BaLa-140 <9.64E+00 0.00E+00 9.64E+00 Be-7 <3.11E+01 0.00E+00 3.11E+01 K-40 2.89E+01 2.74E+01 4.21E+01 Sample ID: 366884 Sample Dates: 1/5/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 8.24E-01 7.11E-01 1.17E+00 Mn-54 <2.99E+00 0.00E+00 2.99E+00 Co-58 <2.41E+00 0.00E+00 2.41E+00 Fe-59 <7.29E+00 0.00E+00 7.29E+00 Co-60 <2.75E+00 0.00E+00 2.75E+00 Zn-65 <5.06E+00 0.00E+00 5.06E+00 Zr-95 <6.52E+00 0.00E+00 6.52E+00 Nb-95 <3.64E+00 0.00E+00 3.64E+00 I-131 <1.12E+01 0.00E+00 1.12E+01 Cs-134 <2.85E+00 0.00E+00 2.85E+00 Cs-137 <2.65E+00 0.00E+00 2.65E+00 BaLa-140 <8.21E+00 0.00E+00 8.21E+00 Be-7 <2.56E+01 0.00E+00 2.56E+01 K-40 <4.54E+01 0.00E+00 4.54E+01 Sample ID: 369985 Sample Dates: 2/2/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA Beta <-6.4E-01 0.00E+00 1.41E+00 Mn-54 <2.93E+00 0.00E+00 2.93E+00 Co-58 <2.46E+00 0.00E+00 2.46E+00 Fe-59 <5.06E+00 0.00E+00 5.06E+00 Co-60 <2.95E+00 0.00E+00 2.95E+00 Zn-65 <5.06E+00 0.00E+00 5.06E+00 Zr-95 <4.23E+00 0.00E+00 4.23E+00 Nb-95 <4.17E+00 0.00E+00 4.17E+00 I-131 <1.10E+01 0.00E+00 1.10E+01 Cs-134 <2.87E+00 0.00E+00 2.87E+00 Cs-137 <2.45E+00 0.00E+00 2.45E+00 BaLa-140 <6.32E+00 0.00E+00 6.32E+00 Be-7 <2.09E+01 0.00E+00 2.09E+01 K-40 7.96E+01 2.79E+01 3.06E+01 Sample ID: 372374 Sample Dates: 12/8/2014 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA H3DW <7.28E+01 0.00E+00 1.85E+02 Sample ID: 372750 Sample Dates: 3/2/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Beta 8.74E-01 6.75E-01 1.10E+00 Mn-54 <3.14E+00 0.00E+00 3.14E+00 Co-58 <3.99E+00 0.00E+00 3.99E+00 Fe-59 <5.90E+00 0.00E+00 5.90E+00 Co-60 <4.21E+00 0.00E+00 4.21E+00 Zn-65 <6.36E+00 0.00E+00 6.36E+00 Zr-95 <7.86E+00 0.00E+00 7.86E+00 Nb-95 <5.63E+00 0.00E+00 5.63E+00 I-131 <1.09E+01 0.00E+00 1.09E+01 Cs-134 <2.86E+00 0.00E+00 2.86E+00 Cs-137 <4.66E+00 0.00E+00 4.66E+00 BaLa-140 <1.07E+01 0.00E+00 1.07E+01 Be-7 <3.26E+01 0.00E+00 3.26E+01 K-40 <6.97E+01 0.00E+00 6.97E+01 Sample ID: 375843 Sample Dates: 3/30/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA Beta 7.30E-01 7.72E-01 1.29E+00 Mn-54 <3.15E+00 0.00E+00 3.15E+00 Co-58 <3.15E+00 0.00E+00 3.15E+00 Fe-59 <7.07E+00 0.00E+00 7.07E+00 Co-60 <3.81E+00 0.00E+00 3.81E+00 Zn-65 <7.01E+00 0.00E+00 7.01E+00 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 48 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 375843 Sample Dates: 3/30/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA Zr-95 <5.59E+00 0.00E+00 5.59E+00 Nb-95 <5.03E+00 0.00E+00 5.03E+00 I-131 <1.20E+01 0.00E+00 1.20E+01 Cs-134 <4.34E+00 0.00E+00 4.34E+00 Cs-137 <3.78E+00 0.00E+00 3.78E+00 BaLa-140 <9.29E+00 0.00E+00 9.29E+00 Be-7 <3.13E+01 0.00E+00 3.13E+01 K-40 <5.92E+01 0.00E+00 5.92E+01 Sample ID: 378814 Sample Dates: 4/27/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.68E+00 7.51E-01 1.17E+00 Mn-54 <2.14E+00 0.00E+00 2.14E+00 Co-58 <2.38E+00 0.00E+00 2.38E+00 Fe-59 <4.74E+00 0.00E+00 4.74E+00 Co-60 <3.18E+00 0.00E+00 3.18E+00 Zn-65 <3.45E+00 0.00E+00 3.45E+00 Zr-95 <4.76E+00 0.00E+00 4.76E+00 Nb-95 <3.22E+00 0.00E+00 3.22E+00 I-131 <1.01E+01 0.00E+00 1.01E+01 Cs-134 <2.69E+00 0.00E+00 2.69E+00 Cs-137 <2.45E+00 0.00E+00 2.45E+00 BaLa-140 <9.57E+00 0.00E+00 9.57E+00 Be-7 <2.09E+01 0.00E+00 2.09E+01 K-40 5.83E+01 2.57E+01 3.29E+01 Sample ID: 380271 Sample Dates: 3/2/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA H3DW <-2.7E+01 0.00E+00 1.88E+02 Sample ID: 380691 Sample Dates: 5/26/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.27E+00 7.59E-01 1.22E+00 Mn-54 <3.69E+00 0.00E+00 3.69E+00 Co-58 <4.10E+00 0.00E+00 4.10E+00 Fe-59 <7.76E+00 0.00E+00 7.76E+00 Co-60 <5.45E+00 0.00E+00 5.45E+00 Zn-65 <7.91E+00 0.00E+00 7.91E+00 Zr-95 <4.50E+00 0.00E+00 4.50E+00 Nb-95 <4.02E+00 0.00E+00 4.02E+00 I-131 <1.15E+01 0.00E+00 1.15E+01 Cs-134 <5.14E+00 0.00E+00 5.14E+00 Cs-137 <3.99E+00 0.00E+00 3.99E+00 BaLa-140 <6.62E+00 0.00E+00 6.62E+00 Be-7 <3.63E+01 0.00E+00 3.63E+01 K-40 <6.52E+01 0.00E+00 6.52E+01 Sample ID: 382382 Sample Dates: 6/22/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA Beta <-5.7E-01 0.00E+00 1.40E+00 Mn-54 <2.58E+00 0.00E+00 2.58E+00 Co-58 <2.78E+00 0.00E+00 2.78E+00 Fe-59 <6.10E+00 0.00E+00 6.10E+00 Co-60 <3.02E+00 0.00E+00 3.02E+00 Zn-65 <5.87E+00 0.00E+00 5.87E+00 Zr-95 <6.05E+00 0.00E+00 6.05E+00 Nb-95 <3.54E+00 0.00E+00 3.54E+00 I-131 <1.17E+01 0.00E+00 1.17E+01 Cs-134 <2.96E+00 0.00E+00 2.96E+00 Cs-137 <2.93E+00 0.00E+00 2.93E+00 BaLa-140 <6.13E+00 0.00E+00 6.13E+00 Be-7 <2.88E+01 0.00E+00 2.88E+01 K-40 5.78E+01 2.42E+01 2.37E+01 Sample ID: 384917 Sample Dates: 7/20/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.75E+00 7.27E-01 1.12E+00 Mn-54 <3.77E+00 0.00E+00 3.77E+00 Co-58 <3.18E+00 0.00E+00 3.18E+00 Fe-59 <8.74E+00 0.00E+00 8.74E+00 Co-60 <2.69E+00 0.00E+00 2.69E+00 Zn-65 <8.48E+00 0.00E+00 8.48E+00 Zr-95 <5.63E+00 0.00E+00 5.63E+00 Nb-95 <5.18E+00 0.00E+00 5.18E+00 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 49 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 384917 Sample Dates: 7/20/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA I-131 <8.39E+00 0.00E+00 8.39E+00 Cs-134 <3.14E+00 0.00E+00 3.14E+00 Cs-137 <3.47E+00 0.00E+00 3.47E+00 BaLa-140 <1.13E+01 0.00E+00 1.13E+01 Be-7 <2.55E+01 0.00E+00 2.55E+01 K-40 <5.01E+01 0.00E+00 5.01E+01 Sample ID: 388125 Sample Dates: 5/26/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA H3DW <2.81E+01 0.00E+00 1.99E+02 Sample ID: 388175 Sample Dates: 8/17/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.59E+00 7.65E-01 1.21E+00 Mn-54 <3.53E+00 0.00E+00 3.53E+00 Co-58 <3.92E+00 0.00E+00 3.92E+00 Fe-59 <6.75E+00 0.00E+00 6.75E+00 Co-60 <5.35E+00 0.00E+00 5.35E+00 Zn-65 <8.72E+00 0.00E+00 8.72E+00 Zr-95 <6.96E+00 0.00E+00 6.96E+00 Nb-95 <2.85E+00 0.00E+00 2.85E+00 I-131 <1.20E+01 0.00E+00 1.20E+01 Cs-134 <4.42E+00 0.00E+00 4.42E+00 Cs-137 <4.12E+00 0.00E+00 4.12E+00 BaLa-140 <2.15E+00 0.00E+00 2.15E+00 Be-7 <3.89E+01 0.00E+00 3.89E+01 K-40 2.58E+01 2.97E+01 4.76E+01 Sample ID: 391257 Sample Dates: 9/14/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.46E+00 7.44E-01 1.18E+00 Mn-54 <1.99E+00 0.00E+00 1.99E+00 Co-58 <2.14E+00 0.00E+00 2.14E+00 Fe-59 <4.68E+00 0.00E+00 4.68E+00 Co-60 <2.04E+00 0.00E+00 2.04E+00 Zn-65 <3.94E+00 0.00E+00 3.94E+00 Zr-95 <3.15E+00 0.00E+00 3.15E+00 Nb-95 <2.46E+00 0.00E+00 2.46E+00 I-131 <1.17E+01 0.00E+00 1.17E+01 Cs-134 <2.66E+00 0.00E+00 2.66E+00 Cs-137 <1.94E+00 0.00E+00 1.94E+00 BaLa-140 <4.94E+00 0.00E+00 4.94E+00 Be-7 <2.39E+01 0.00E+00 2.39E+01 K-40 3.08E+01 2.42E+01 3.76E+01 Sample ID: 394440 Sample Dates: 10/12/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.36E+00 7.12E-01 1.12E+00 Mn-54 <2.30E+00 0.00E+00 2.30E+00 Co-58 <2.93E+00 0.00E+00 2.93E+00 Fe-59 <6.78E+00 0.00E+00 6.78E+00 Co-60 <2.96E+00 0.00E+00 2.96E+00 Zn-65 <6.10E+00 0.00E+00 6.10E+00 Zr-95 <6.14E+00 0.00E+00 6.14E+00 Nb-95 <3.90E+00 0.00E+00 3.90E+00 I-131 <8.90E+00 0.00E+00 8.90E+00 Cs-134 <2.91E+00 0.00E+00 2.91E+00 Cs-137 <2.95E+00 0.00E+00 2.95E+00 BaLa-140 <8.74E+00 0.00E+00 8.74E+00 Be-7 <2.38E+01 0.00E+00 2.38E+01 K-40 <5.24E+01 0.00E+00 5.24E+01 Sample ID: 396356 Sample Dates: 11/9/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA Beta <6.22E-01 0.00E+00 1.35E+00 Mn-54 <2.54E+00 0.00E+00 2.54E+00 Co-58 <2.52E+00 0.00E+00 2.52E+00 Fe-59 <6.01E+00 0.00E+00 6.01E+00 Co-60 <2.91E+00 0.00E+00 2.91E+00 Zn-65 <7.17E+00 0.00E+00 7.17E+00 Zr-95 <5.02E+00 0.00E+00 5.02E+00 Nb-95 <3.35E+00 0.00E+00 3.35E+00 I-131 <1.07E+01 0.00E+00 1.07E+01 Cs-134 <3.57E+00 0.00E+00 3.57E+00 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 50 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 396356 Sample Dates: 11/9/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA Cs-137 <3.72E+00 0.00E+00 3.72E+00 BaLa-140 <7.40E+00 0.00E+00 7.40E+00 Be-7 <2.74E+01 0.00E+00 2.74E+01 K-40 <5.25E+01 0.00E+00 5.25E+01 Sample ID: 397100 Sample Dates: 8/17/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA H3DW <-2.4E+01 0.00E+00 1.99E+02 Sample Point 064 [ CONTROL - SSW @ 6.67 miles ]

Sample ID: 364788 Sample Dates: 12/8/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.60E+00 7.35E-01 1.15E+00 Mn-54 <2.36E+00 0.00E+00 2.36E+00 Co-58 <2.32E+00 0.00E+00 2.32E+00 Fe-59 <5.91E+00 0.00E+00 5.91E+00 Co-60 <2.24E+00 0.00E+00 2.24E+00 Zn-65 <4.93E+00 0.00E+00 4.93E+00 Zr-95 <4.65E+00 0.00E+00 4.65E+00 Nb-95 <3.73E+00 0.00E+00 3.73E+00 I-131 <9.99E+00 0.00E+00 9.99E+00 Cs-134 <2.39E+00 0.00E+00 2.39E+00 Cs-137 <3.11E+00 0.00E+00 3.11E+00 BaLa-140 <6.11E+00 0.00E+00 6.11E+00 Be-7 <1.77E+01 0.00E+00 1.77E+01 K-40 3.10E+01 2.21E+01 3.32E+01 Sample ID: 366885 Sample Dates: 1/5/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 9.64E-01 7.18E-01 1.17E+00 Mn-54 <2.54E+00 0.00E+00 2.54E+00 Co-58 <2.35E+00 0.00E+00 2.35E+00 Fe-59 <6.18E+00 0.00E+00 6.18E+00 Co-60 <2.79E+00 0.00E+00 2.79E+00 Zn-65 <4.85E+00 0.00E+00 4.85E+00 Zr-95 <6.23E+00 0.00E+00 6.23E+00 Nb-95 <3.07E+00 0.00E+00 3.07E+00 I-131 <1.08E+01 0.00E+00 1.08E+01 Cs-134 <2.92E+00 0.00E+00 2.92E+00 Cs-137 <1.92E+00 0.00E+00 1.92E+00 BaLa-140 <7.94E+00 0.00E+00 7.94E+00 Be-7 <2.36E+01 0.00E+00 2.36E+01 K-40 2.73E+01 2.00E+01 2.80E+01 Sample ID: 369986 Sample Dates: 2/2/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA Beta <-1.1E+00 0.00E+00 1.41E+00 Mn-54 <2.71E+00 0.00E+00 2.71E+00 Co-58 <3.48E+00 0.00E+00 3.48E+00 Fe-59 <7.98E+00 0.00E+00 7.98E+00 Co-60 <3.20E+00 0.00E+00 3.20E+00 Zn-65 <7.00E+00 0.00E+00 7.00E+00 Zr-95 <5.69E+00 0.00E+00 5.69E+00 Nb-95 <3.81E+00 0.00E+00 3.81E+00 I-131 <1.19E+01 0.00E+00 1.19E+01 Cs-134 <3.01E+00 0.00E+00 3.01E+00 Cs-137 <2.34E+00 0.00E+00 2.34E+00 BaLa-140 <7.28E+00 0.00E+00 7.28E+00 Be-7 <3.06E+01 0.00E+00 3.06E+01 K-40 <3.56E+01 0.00E+00 3.56E+01 Sample ID: 372375 Sample Dates: 12/8/2014 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA H3DW <-2.2E+01 0.00E+00 1.84E+02 Sample ID: 372751 Sample Dates: 3/2/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Beta 6.05E-01 6.59E-01 1.10E+00 Mn-54 <3.46E+00 0.00E+00 3.46E+00 Co-58 <4.24E+00 0.00E+00 4.24E+00 Fe-59 <4.53E+00 0.00E+00 4.53E+00 Co-60 <2.29E+00 0.00E+00 2.29E+00 Zn-65 <6.39E+00 0.00E+00 6.39E+00 Zr-95 <4.35E+00 0.00E+00 4.35E+00 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 51 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 372751 Sample Dates: 3/2/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Nb-95 <4.91E+00 0.00E+00 4.91E+00 I-131 <1.20E+01 0.00E+00 1.20E+01 Cs-134 <3.69E+00 0.00E+00 3.69E+00 Cs-137 <3.09E+00 0.00E+00 3.09E+00 BaLa-140 <7.49E+00 0.00E+00 7.49E+00 Be-7 <3.46E+01 0.00E+00 3.46E+01 K-40 5.36E+01 3.34E+01 4.60E+01 Sample ID: 375844 Sample Dates: 3/30/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA Beta <4.07E-01 0.00E+00 1.28E+00 Mn-54 <2.89E+00 0.00E+00 2.89E+00 Co-58 <3.43E+00 0.00E+00 3.43E+00 Fe-59 <7.10E+00 0.00E+00 7.10E+00 Co-60 <3.09E+00 0.00E+00 3.09E+00 Zn-65 <6.87E+00 0.00E+00 6.87E+00 Zr-95 <6.09E+00 0.00E+00 6.09E+00 Nb-95 <4.20E+00 0.00E+00 4.20E+00 I-131 <1.16E+01 0.00E+00 1.16E+01 Cs-134 <3.42E+00 0.00E+00 3.42E+00 Cs-137 <3.78E+00 0.00E+00 3.78E+00 BaLa-140 <6.94E+00 0.00E+00 6.94E+00 Be-7 <2.95E+01 0.00E+00 2.95E+01 K-40 <5.57E+01 0.00E+00 5.57E+01 Sample ID: 378815 Sample Dates: 4/27/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.77E+00 7.54E-01 1.17E+00 Mn-54 <3.51E+00 0.00E+00 3.51E+00 Co-58 <2.19E+00 0.00E+00 2.19E+00 Fe-59 <5.24E+00 0.00E+00 5.24E+00 Co-60 <4.48E+00 0.00E+00 4.48E+00 Zn-65 <7.81E+00 0.00E+00 7.81E+00 Zr-95 <5.48E+00 0.00E+00 5.48E+00 Nb-95 <5.03E+00 0.00E+00 5.03E+00 I-131 <1.12E+01 0.00E+00 1.12E+01 Cs-134 <4.06E+00 0.00E+00 4.06E+00 Cs-137 <2.87E+00 0.00E+00 2.87E+00 BaLa-140 <8.99E+00 0.00E+00 8.99E+00 Be-7 <3.44E+01 0.00E+00 3.44E+01 K-40 <5.29E+01 0.00E+00 5.29E+01 Sample ID: 380272 Sample Dates: 3/2/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA H3DW <1.58E+01 0.00E+00 1.90E+02 Sample ID: 380692 Sample Dates: 5/26/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.65E+00 8.21E-01 1.22E+00 Mn-54 <2.58E+00 0.00E+00 2.58E+00 Co-58 <3.75E+00 0.00E+00 3.75E+00 Fe-59 <7.61E+00 0.00E+00 7.61E+00 Co-60 <3.86E+00 0.00E+00 3.86E+00 Zn-65 <6.36E+00 0.00E+00 6.36E+00 Zr-95 <8.86E+00 0.00E+00 8.86E+00 Nb-95 <2.77E+00 0.00E+00 2.77E+00 I-131 <1.17E+01 0.00E+00 1.17E+01 Cs-134 <4.99E+00 0.00E+00 4.99E+00 Cs-137 <3.04E+00 0.00E+00 3.04E+00 BaLa-140 <8.25E+00 0.00E+00 8.25E+00 Be-7 <3.64E+01 0.00E+00 3.64E+01 K-40 1.41E+01 2.95E+01 5.19E+01 Sample ID: 382383 Sample Dates: 6/22/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA Beta <-5.7E-01 0.00E+00 1.40E+00 Mn-54 <3.48E+00 0.00E+00 3.48E+00 Co-58 <3.68E+00 0.00E+00 3.68E+00 Fe-59 <5.45E+00 0.00E+00 5.45E+00 Co-60 <3.38E+00 0.00E+00 3.38E+00 Zn-65 <6.23E+00 0.00E+00 6.23E+00 Zr-95 <6.74E+00 0.00E+00 6.74E+00 Nb-95 <4.83E+00 0.00E+00 4.83E+00 I-131 <1.07E+01 0.00E+00 1.07E+01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 52 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 382383 Sample Dates: 6/22/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <3.24E+00 0.00E+00 3.24E+00 Cs-137 <3.05E+00 0.00E+00 3.05E+00 BaLa-140 <8.89E+00 0.00E+00 8.89E+00 Be-7 <2.84E+01 0.00E+00 2.84E+01 K-40 4.45E+01 2.60E+01 3.29E+01 Sample ID: 384918 Sample Dates: 7/20/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.46E+00 0.00E+00 2.46E+00 Co-58 <2.76E+00 0.00E+00 2.76E+00 Fe-59 <5.81E+00 0.00E+00 5.81E+00 Co-60 <2.73E+00 0.00E+00 2.73E+00 Zn-65 <5.59E+00 0.00E+00 5.59E+00 Zr-95 <5.08E+00 0.00E+00 5.08E+00 Nb-95 <2.75E+00 0.00E+00 2.75E+00 I-131 <1.13E+01 0.00E+00 1.13E+01 Cs-134 <2.82E+00 0.00E+00 2.82E+00 Cs-137 <2.94E+00 0.00E+00 2.94E+00 BaLa-140 <8.14E+00 0.00E+00 8.14E+00 Be-7 <2.69E+01 0.00E+00 2.69E+01 K-40 1.06E+01 1.97E+01 3.40E+01 Sample ID: 388126 Sample Dates: 5/26/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA H3DW <7.97E+01 0.00E+00 1.98E+02 Sample ID: 388176 Sample Dates: 8/17/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.62E+00 7.66E-01 1.21E+00 Mn-54 <3.30E+00 0.00E+00 3.30E+00 Co-58 <3.37E+00 0.00E+00 3.37E+00 Fe-59 <5.21E+00 0.00E+00 5.21E+00 Co-60 <2.93E+00 0.00E+00 2.93E+00 Zn-65 <7.13E+00 0.00E+00 7.13E+00 Zr-95 <5.98E+00 0.00E+00 5.98E+00 Nb-95 <4.44E+00 0.00E+00 4.44E+00 I-131 <1.19E+01 0.00E+00 1.19E+01 Cs-134 <2.42E+00 0.00E+00 2.42E+00 Cs-137 <4.14E+00 0.00E+00 4.14E+00 BaLa-140 <5.05E+00 0.00E+00 5.05E+00 Be-7 <2.78E+01 0.00E+00 2.78E+01 K-40 3.53E+01 3.10E+01 4.72E+01 Sample ID: 391258 Sample Dates: 9/14/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.91E+00 7.70E-01 1.18E+00 Mn-54 <1.69E+00 0.00E+00 1.69E+00 Co-58 <2.21E+00 0.00E+00 2.21E+00 Fe-59 <4.80E+00 0.00E+00 4.80E+00 Co-60 <2.03E+00 0.00E+00 2.03E+00 Zn-65 <4.37E+00 0.00E+00 4.37E+00 Zr-95 <4.33E+00 0.00E+00 4.33E+00 Nb-95 <3.04E+00 0.00E+00 3.04E+00 I-131 <1.00E+01 0.00E+00 1.00E+01 Cs-134 <2.44E+00 0.00E+00 2.44E+00 Cs-137 <2.33E+00 0.00E+00 2.33E+00 BaLa-140 <7.10E+00 0.00E+00 7.10E+00 Be-7 <2.46E+01 0.00E+00 2.46E+01 K-40 3.58E+01 1.83E+01 2.27E+01 Sample ID: 394441 Sample Dates: 10/12/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.11E+00 7.01E-01 1.13E+00 Mn-54 <3.25E+00 0.00E+00 3.25E+00 Co-58 <3.20E+00 0.00E+00 3.20E+00 Fe-59 <5.32E+00 0.00E+00 5.32E+00 Co-60 <2.21E+00 0.00E+00 2.21E+00 Zn-65 <5.31E+00 0.00E+00 5.31E+00 Zr-95 <5.67E+00 0.00E+00 5.67E+00 Nb-95 <3.73E+00 0.00E+00 3.73E+00 I-131 <1.06E+01 0.00E+00 1.06E+01 Cs-134 <2.22E+00 0.00E+00 2.22E+00 Cs-137 <2.78E+00 0.00E+00 2.78E+00 BaLa-140 <7.69E+00 0.00E+00 7.69E+00 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 53 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 394441 Sample Dates: 10/12/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA Be-7 <3.37E+01 0.00E+00 3.37E+01 K-40 <4.90E+01 0.00E+00 4.90E+01 Sample ID: 396357 Sample Dates: 11/9/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA Beta <1.16E-01 0.00E+00 1.36E+00 Mn-54 <3.63E+00 0.00E+00 3.63E+00 Co-58 <3.04E+00 0.00E+00 3.04E+00 Fe-59 <6.75E+00 0.00E+00 6.75E+00 Co-60 <3.65E+00 0.00E+00 3.65E+00 Zn-65 <7.94E+00 0.00E+00 7.94E+00 Zr-95 <7.44E+00 0.00E+00 7.44E+00 Nb-95 <4.74E+00 0.00E+00 4.74E+00 I-131 <1.06E+01 0.00E+00 1.06E+01 Cs-134 <2.30E+00 0.00E+00 2.30E+00 Cs-137 <3.38E+00 0.00E+00 3.38E+00 BaLa-140 <1.05E+01 0.00E+00 1.05E+01 Be-7 <3.04E+01 0.00E+00 3.04E+01 K-40 <6.79E+01 0.00E+00 6.79E+01 Sample ID: 397101 Sample Dates: 8/17/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA H3DW <-1.1E+02 0.00E+00 1.99E+02 Sample Point 066 [ INDICATOR - SSE @ 18.9 miles ]

Sample ID: 364789 Sample Dates: 12/8/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.35E+00 7.27E-01 1.16E+00 Mn-54 <1.99E+00 0.00E+00 1.99E+00 Co-58 <2.41E+00 0.00E+00 2.41E+00 Fe-59 <4.86E+00 0.00E+00 4.86E+00 Co-60 <2.17E+00 0.00E+00 2.17E+00 Zn-65 <4.28E+00 0.00E+00 4.28E+00 Zr-95 <4.36E+00 0.00E+00 4.36E+00 Nb-95 <3.29E+00 0.00E+00 3.29E+00 I-131 <1.15E+01 0.00E+00 1.15E+01 Cs-134 <2.65E+00 0.00E+00 2.65E+00 Cs-137 <2.08E+00 0.00E+00 2.08E+00 BaLa-140 <6.57E+00 0.00E+00 6.57E+00 Be-7 <2.23E+01 0.00E+00 2.23E+01 K-40 1.81E+02 3.38E+01 3.26E+01 Sample ID: 366886 Sample Dates: 1/5/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.50E+00 7.43E-01 1.17E+00 Mn-54 <2.97E+00 0.00E+00 2.97E+00 Co-58 <4.09E+00 0.00E+00 4.09E+00 Fe-59 <7.36E+00 0.00E+00 7.36E+00 Co-60 <3.71E+00 0.00E+00 3.71E+00 Zn-65 <7.82E+00 0.00E+00 7.82E+00 Zr-95 <6.94E+00 0.00E+00 6.94E+00 Nb-95 <4.61E+00 0.00E+00 4.61E+00 I-131 <1.18E+01 0.00E+00 1.18E+01 Cs-134 <4.07E+00 0.00E+00 4.07E+00 Cs-137 <3.70E+00 0.00E+00 3.70E+00 BaLa-140 <1.13E+01 0.00E+00 1.13E+01 Be-7 <2.88E+01 0.00E+00 2.88E+01 K-40 <4.88E+01 0.00E+00 4.88E+01 Sample ID: 369987 Sample Dates: 2/2/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA Beta <1.23E-01 0.00E+00 1.42E+00 Mn-54 <2.81E+00 0.00E+00 2.81E+00 Co-58 <2.90E+00 0.00E+00 2.90E+00 Fe-59 <7.28E+00 0.00E+00 7.28E+00 Co-60 <4.18E+00 0.00E+00 4.18E+00 Zn-65 <5.41E+00 0.00E+00 5.41E+00 Zr-95 <5.15E+00 0.00E+00 5.15E+00 Nb-95 <3.59E+00 0.00E+00 3.59E+00 I-131 <1.19E+01 0.00E+00 1.19E+01 Cs-134 <2.86E+00 0.00E+00 2.86E+00 Cs-137 <2.82E+00 0.00E+00 2.82E+00 BaLa-140 <1.03E+01 0.00E+00 1.03E+01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 54 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 369987 Sample Dates: 2/2/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA Be-7 <2.39E+01 0.00E+00 2.39E+01 K-40 <5.63E+01 0.00E+00 5.63E+01 Sample ID: 372376 Sample Dates: 12/8/2014 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA H3DW 2.56E+02 1.14E+02 1.84E+02 Sample ID: 372752 Sample Dates: 3/2/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Beta 3.36E+00 8.00E-01 1.11E+00 Mn-54 <2.35E+00 0.00E+00 2.35E+00 Co-58 <3.48E+00 0.00E+00 3.48E+00 Fe-59 <7.37E+00 0.00E+00 7.37E+00 Co-60 <3.35E+00 0.00E+00 3.35E+00 Zn-65 <4.42E+00 0.00E+00 4.42E+00 Zr-95 <6.18E+00 0.00E+00 6.18E+00 Nb-95 <3.78E+00 0.00E+00 3.78E+00 I-131 <1.14E+01 0.00E+00 1.14E+01 Cs-134 <3.47E+00 0.00E+00 3.47E+00 Cs-137 <3.24E+00 0.00E+00 3.24E+00 BaLa-140 <7.53E+00 0.00E+00 7.53E+00 Be-7 <3.26E+01 0.00E+00 3.26E+01 K-40 3.76E+01 2.94E+01 4.36E+01 Sample ID: 375845 Sample Dates: 3/30/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA Beta 8.65E-01 7.79E-01 1.29E+00 Mn-54 <2.52E+00 0.00E+00 2.52E+00 Co-58 <2.72E+00 0.00E+00 2.72E+00 Fe-59 <4.56E+00 0.00E+00 4.56E+00 Co-60 <3.08E+00 0.00E+00 3.08E+00 Zn-65 <5.45E+00 0.00E+00 5.45E+00 Zr-95 <3.61E+00 0.00E+00 3.61E+00 Nb-95 <3.34E+00 0.00E+00 3.34E+00 I-131 <9.83E+00 0.00E+00 9.83E+00 Cs-134 <2.88E+00 0.00E+00 2.88E+00 Cs-137 <2.51E+00 0.00E+00 2.51E+00 BaLa-140 <7.73E+00 0.00E+00 7.73E+00 Be-7 <2.47E+01 0.00E+00 2.47E+01 K-40 3.22E+01 2.27E+01 3.28E+01 Sample ID: 378816 Sample Dates: 4/27/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA Beta 1.86E+00 7.67E-01 1.18E+00 Mn-54 <2.99E+00 0.00E+00 2.99E+00 Co-58 <2.58E+00 0.00E+00 2.58E+00 Fe-59 <5.81E+00 0.00E+00 5.81E+00 Co-60 <3.10E+00 0.00E+00 3.10E+00 Zn-65 <4.98E+00 0.00E+00 4.98E+00 Zr-95 <5.31E+00 0.00E+00 5.31E+00 Nb-95 <4.15E+00 0.00E+00 4.15E+00 I-131 <1.18E+01 0.00E+00 1.18E+01 Cs-134 <3.20E+00 0.00E+00 3.20E+00 Cs-137 <2.69E+00 0.00E+00 2.69E+00 BaLa-140 <1.01E+01 0.00E+00 1.01E+01 Be-7 <3.14E+01 0.00E+00 3.14E+01 K-40 <4.83E+01 0.00E+00 4.83E+01 Sample ID: 380273 Sample Dates: 3/2/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA H3DW 2.50E+02 1.19E+02 1.93E+02 Sample ID: 380693 Sample Dates: 5/26/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.08E+00 8.03E-01 1.23E+00 Mn-54 <3.19E+00 0.00E+00 3.19E+00 Co-58 <3.43E+00 0.00E+00 3.43E+00 Fe-59 <6.30E+00 0.00E+00 6.30E+00 Co-60 <2.29E+00 0.00E+00 2.29E+00 Zn-65 <5.13E+00 0.00E+00 5.13E+00 Zr-95 <5.88E+00 0.00E+00 5.88E+00 Nb-95 <4.54E+00 0.00E+00 4.54E+00 I-131 <1.08E+01 0.00E+00 1.08E+01 Cs-134 <3.54E+00 0.00E+00 3.54E+00 Cs-137 <3.27E+00 0.00E+00 3.27E+00 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 55 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 380693 Sample Dates: 5/26/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA BaLa-140 <6.36E+00 0.00E+00 6.36E+00 Be-7 <2.06E+01 0.00E+00 2.06E+01 K-40 3.16E+01 3.57E+01 5.78E+01 Sample ID: 382384 Sample Dates: 6/22/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA Beta <3.89E-01 0.00E+00 1.42E+00 Mn-54 <3.50E+00 0.00E+00 3.50E+00 Co-58 <3.14E+00 0.00E+00 3.14E+00 Fe-59 <7.09E+00 0.00E+00 7.09E+00 Co-60 <1.84E+00 0.00E+00 1.84E+00 Zn-65 <6.91E+00 0.00E+00 6.91E+00 Zr-95 <6.47E+00 0.00E+00 6.47E+00 Nb-95 <5.08E+00 0.00E+00 5.08E+00 I-131 <1.17E+01 0.00E+00 1.17E+01 Cs-134 <2.91E+00 0.00E+00 2.91E+00 Cs-137 <3.50E+00 0.00E+00 3.50E+00 BaLa-140 <9.93E+00 0.00E+00 9.93E+00 Be-7 <2.67E+01 0.00E+00 2.67E+01 K-40 6.31E+01 3.23E+01 3.95E+01 Sample ID: 384919 Sample Dates: 7/20/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA Beta 4.97E+00 8.76E-01 1.13E+00 Mn-54 <2.63E+00 0.00E+00 2.63E+00 Co-58 <3.74E+00 0.00E+00 3.74E+00 Fe-59 <6.30E+00 0.00E+00 6.30E+00 Co-60 <3.13E+00 0.00E+00 3.13E+00 Zn-65 <5.37E+00 0.00E+00 5.37E+00 Zr-95 <5.50E+00 0.00E+00 5.50E+00 Nb-95 <4.63E+00 0.00E+00 4.63E+00 I-131 <1.14E+01 0.00E+00 1.14E+01 Cs-134 <3.45E+00 0.00E+00 3.45E+00 Cs-137 <3.21E+00 0.00E+00 3.21E+00 BaLa-140 <8.71E+00 0.00E+00 8.71E+00 Be-7 <2.94E+01 0.00E+00 2.94E+01 K-40 5.98E+01 2.82E+01 3.17E+01 Sample ID: 388127 Sample Dates: 5/26/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA H3DW 4.68E+02 1.28E+02 1.98E+02 Sample ID: 388177 Sample Dates: 8/17/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.96E+00 8.32E-01 1.22E+00 Mn-54 <2.28E+00 0.00E+00 2.28E+00 Co-58 <3.43E+00 0.00E+00 3.43E+00 Fe-59 <7.63E+00 0.00E+00 7.63E+00 Co-60 <2.31E+00 0.00E+00 2.31E+00 Zn-65 <6.09E+00 0.00E+00 6.09E+00 Zr-95 <5.67E+00 0.00E+00 5.67E+00 Nb-95 <3.95E+00 0.00E+00 3.95E+00 I-131 <1.09E+01 0.00E+00 1.09E+01 Cs-134 <3.01E+00 0.00E+00 3.01E+00 Cs-137 <2.85E+00 0.00E+00 2.85E+00 BaLa-140 <5.97E+00 0.00E+00 5.97E+00 Be-7 <2.30E+01 0.00E+00 2.30E+01 K-40 4.67E+01 2.17E+01 2.37E+01 Sample ID: 391259 Sample Dates: 9/14/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.42E+00 7.94E-01 1.19E+00 Mn-54 <2.04E+00 0.00E+00 2.04E+00 Co-58 <2.42E+00 0.00E+00 2.42E+00 Fe-59 <5.67E+00 0.00E+00 5.67E+00 Co-60 <2.20E+00 0.00E+00 2.20E+00 Zn-65 <5.04E+00 0.00E+00 5.04E+00 Zr-95 <4.62E+00 0.00E+00 4.62E+00 Nb-95 <3.09E+00 0.00E+00 3.09E+00 I-131 <1.00E+01 0.00E+00 1.00E+01 Cs-134 <2.73E+00 0.00E+00 2.73E+00 Cs-137 <2.55E+00 0.00E+00 2.55E+00 BaLa-140 <5.61E+00 0.00E+00 5.61E+00 Be-7 4.61E+00 1.50E+01 2.60E+01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 56 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 391259 Sample Dates: 9/14/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA K-40 3.62E+01 2.58E+01 3.92E+01 Sample ID: 394442 Sample Dates: 10/12/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA Beta 2.07E+00 7.56E-01 1.14E+00 Mn-54 <3.97E+00 0.00E+00 3.97E+00 Co-58 <4.06E+00 0.00E+00 4.06E+00 Fe-59 <8.21E+00 0.00E+00 8.21E+00 Co-60 <4.14E+00 0.00E+00 4.14E+00 Zn-65 <9.42E+00 0.00E+00 9.42E+00 Zr-95 <6.78E+00 0.00E+00 6.78E+00 Nb-95 <4.78E+00 0.00E+00 4.78E+00 I-131 <1.17E+01 0.00E+00 1.17E+01 Cs-134 <4.04E+00 0.00E+00 4.04E+00 Cs-137 <3.35E+00 0.00E+00 3.35E+00 BaLa-140 <6.12E+00 0.00E+00 6.12E+00 Be-7 <3.32E+01 0.00E+00 3.32E+01 K-40 1.70E+01 2.96E+01 5.07E+01 Sample ID: 396358 Sample Dates: 11/9/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA Beta <5.01E-01 0.00E+00 1.37E+00 Mn-54 <3.03E+00 0.00E+00 3.03E+00 Co-58 <2.95E+00 0.00E+00 2.95E+00 Fe-59 <7.05E+00 0.00E+00 7.05E+00 Co-60 <3.25E+00 0.00E+00 3.25E+00 Zn-65 <4.63E+00 0.00E+00 4.63E+00 Zr-95 <7.23E+00 0.00E+00 7.23E+00 Nb-95 <5.10E+00 0.00E+00 5.10E+00 I-131 <1.20E+01 0.00E+00 1.20E+01 Cs-134 <3.15E+00 0.00E+00 3.15E+00 Cs-137 <2.75E+00 0.00E+00 2.75E+00 BaLa-140 <1.01E+01 0.00E+00 1.01E+01 Be-7 <2.85E+01 0.00E+00 2.85E+01 K-40 <4.87E+01 0.00E+00 4.87E+01 Sample ID: 397102 Sample Dates: 8/17/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA H3DW <1.91E+02 0.00E+00 1.99E+02 Media Type: FISH Concentration (Activity): pCi/kg wet Sample Point 060 [ CONTROL FISH / INDICATOR - NE @ 3.23 miles ]

Sample ID: 374824 Sample Dates: 4/14/2015 - 4/14/2015 FREESWIM Nuclide Activity 2 Sigma Error MDA Mn-54 <5.10E+00 0.00E+00 5.10E+00 Co-58 <5.27E+00 0.00E+00 5.27E+00 Fe-59 <1.33E+01 0.00E+00 1.33E+01 Co-60 <4.98E+00 0.00E+00 4.98E+00 Zn-65 <1.54E+01 0.00E+00 1.54E+01 Nb-95 <5.55E+00 0.00E+00 5.55E+00 I-131 <5.48E+00 0.00E+00 5.48E+00 Cs-134 <5.05E+00 0.00E+00 5.05E+00 Cs-137 1.20E+01 5.15E+00 7.11E+00 Be-7 <3.45E+01 0.00E+00 3.45E+01 K-40 3.21E+03 3.30E+02 6.35E+01 Ag-110M <4.60E+00 0.00E+00 4.60E+00 Sb-122 <8.11E+00 0.00E+00 8.11E+00 Sb-125 <1.13E+01 0.00E+00 1.13E+01 Sample ID: 374825 Sample Dates: 4/13/2015 - 4/14/2015 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Mn-54 <1.35E+01 0.00E+00 1.35E+01 Co-58 <1.16E+01 0.00E+00 1.16E+01 Fe-59 <2.47E+01 0.00E+00 2.47E+01 Co-60 <1.33E+01 0.00E+00 1.33E+01 Zn-65 <2.74E+01 0.00E+00 2.74E+01 Nb-95 <1.20E+01 0.00E+00 1.20E+01 I-131 <1.23E+01 0.00E+00 1.23E+01 Cs-134 <1.05E+01 0.00E+00 1.05E+01 Cs-137 <1.32E+01 0.00E+00 1.32E+01 Be-7 <6.54E+01 0.00E+00 6.54E+01 K-40 2.87E+03 4.33E+02 1.18E+02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 57 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 374825 Sample Dates: 4/13/2015 - 4/14/2015 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Ag-110M <8.85E+00 0.00E+00 8.85E+00 Sb-122 <2.09E+01 0.00E+00 2.09E+01 Sb-125 <2.37E+01 0.00E+00 2.37E+01 Sample ID: 391448 Sample Dates: 10/12/2015 - 10/12/2015 FREESWIM Nuclide Activity 2 Sigma Error MDA Mn-54 <1.17E+01 0.00E+00 1.17E+01 Co-58 <1.60E+01 0.00E+00 1.60E+01 Fe-59 <2.80E+01 0.00E+00 2.80E+01 Co-60 <2.05E+01 0.00E+00 2.05E+01 Zn-65 <2.26E+01 0.00E+00 2.26E+01 Nb-95 <1.54E+01 0.00E+00 1.54E+01 I-131 <1.93E+01 0.00E+00 1.93E+01 Cs-134 <1.42E+01 0.00E+00 1.42E+01 Cs-137 <2.00E+01 0.00E+00 2.00E+01 Be-7 <1.19E+02 0.00E+00 1.19E+02 K-40 4.23E+03 6.03E+02 2.36E+02 Ag-110M <1.35E+01 0.00E+00 1.35E+01 Sb-122 <9.42E+01 0.00E+00 9.42E+01 Sb-125 <3.42E+01 0.00E+00 3.42E+01 Sample ID: 391449 Sample Dates: 10/12/2015 - 10/12/2015 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Mn-54 <1.04E+01 0.00E+00 1.04E+01 Co-58 <1.94E+01 0.00E+00 1.94E+01 Fe-59 <1.99E+01 0.00E+00 1.99E+01 Co-60 <1.48E+01 0.00E+00 1.48E+01 Zn-65 <2.08E+01 0.00E+00 2.08E+01 Nb-95 <1.98E+01 0.00E+00 1.98E+01 I-131 <2.00E+01 0.00E+00 2.00E+01 Cs-134 <1.88E+01 0.00E+00 1.88E+01 Cs-137 <2.18E+01 0.00E+00 2.18E+01 Be-7 <9.89E+01 0.00E+00 9.89E+01 K-40 3.48E+03 5.84E+02 3.62E+02 Ag-110M <7.19E+00 0.00E+00 7.19E+00 Sb-122 <1.09E+02 0.00E+00 1.09E+02 Sb-125 <3.17E+01 0.00E+00 3.17E+01 Sample Point 063 [ INDICATOR - ESE @ 0.8 miles ]

Sample ID: 374826 Sample Dates: 4/13/2015 - 4/13/2015 FREESWIM Nuclide Activity 2 Sigma Error MDA Mn-54 <1.46E+01 0.00E+00 1.46E+01 Co-58 <1.72E+01 0.00E+00 1.72E+01 Fe-59 <3.38E+01 0.00E+00 3.38E+01 Co-60 <1.65E+01 0.00E+00 1.65E+01 Zn-65 <4.92E+01 0.00E+00 4.92E+01 Nb-95 <1.29E+01 0.00E+00 1.29E+01 I-131 <1.59E+01 0.00E+00 1.59E+01 Cs-134 <1.27E+01 0.00E+00 1.27E+01 Cs-137 1.47E+01 1.40E+01 2.17E+01 Be-7 <1.40E+02 0.00E+00 1.40E+02 K-40 3.89E+03 6.43E+02 3.46E+02 Ag-110M <1.13E+01 0.00E+00 1.13E+01 Sb-122 <3.46E+01 0.00E+00 3.46E+01 Sb-125 <3.85E+01 0.00E+00 3.85E+01 Sample ID: 374827 Sample Dates: 4/13/2015 - 4/13/2015 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Mn-54 <2.72E+01 0.00E+00 2.72E+01 Co-58 <1.69E+01 0.00E+00 1.69E+01 Fe-59 <6.26E+01 0.00E+00 6.26E+01 Co-60 <2.44E+01 0.00E+00 2.44E+01 Zn-65 <4.95E+01 0.00E+00 4.95E+01 Nb-95 <2.14E+01 0.00E+00 2.14E+01 I-131 <2.22E+01 0.00E+00 2.22E+01 Cs-134 <2.19E+01 0.00E+00 2.19E+01 Cs-137 <2.47E+01 0.00E+00 2.47E+01 Be-7 <1.62E+02 0.00E+00 1.62E+02 K-40 2.66E+03 6.32E+02 5.03E+02 Ag-110M <2.61E+01 0.00E+00 2.61E+01 Sb-122 <5.04E+01 0.00E+00 5.04E+01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 58 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 374827 Sample Dates: 4/13/2015 - 4/13/2015 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Sb-125 <5.70E+01 0.00E+00 5.70E+01 Sample ID: 391450 Sample Dates: 10/12/2015 - 10/12/2015 FREESWIM Nuclide Activity 2 Sigma Error MDA Mn-54 <1.50E+01 0.00E+00 1.50E+01 Co-58 <1.32E+01 0.00E+00 1.32E+01 Fe-59 <4.12E+01 0.00E+00 4.12E+01 Co-60 <1.85E+01 0.00E+00 1.85E+01 Zn-65 <3.56E+01 0.00E+00 3.56E+01 Nb-95 <1.21E+01 0.00E+00 1.21E+01 I-131 <1.96E+01 0.00E+00 1.96E+01 Cs-134 <1.10E+01 0.00E+00 1.10E+01 Cs-137 1.63E+01 1.44E+01 2.22E+01 Be-7 <9.25E+01 0.00E+00 9.25E+01 K-40 3.01E+03 5.02E+02 1.59E+02 Ag-110M <1.38E+01 0.00E+00 1.38E+01 Sb-122 <8.29E+01 0.00E+00 8.29E+01 Sb-125 <2.97E+01 0.00E+00 2.97E+01 Sample ID: 391451 Sample Dates: 10/12/2015 - 10/12/2015 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Mn-54 <2.16E+01 0.00E+00 2.16E+01 Co-58 <1.16E+01 0.00E+00 1.16E+01 Fe-59 <5.60E+01 0.00E+00 5.60E+01 Co-60 <2.38E+01 0.00E+00 2.38E+01 Zn-65 <5.11E+01 0.00E+00 5.11E+01 Nb-95 <1.73E+01 0.00E+00 1.73E+01 I-131 <2.34E+01 0.00E+00 2.34E+01 Cs-134 <2.05E+01 0.00E+00 2.05E+01 Cs-137 <3.36E+01 0.00E+00 3.36E+01 Be-7 <1.61E+02 0.00E+00 1.61E+02 K-40 2.85E+03 5.55E+02 6.00E+01 Ag-110M <1.59E+01 0.00E+00 1.59E+01 Sb-122 <9.84E+01 0.00E+00 9.84E+01 Sb-125 <3.97E+01 0.00E+00 3.97E+01 Sample Point 067 [ INDICATOR - SSE @ 4.34 miles ]

Sample ID: 374828 Sample Dates: 4/13/2015 - 4/13/2015 FREESWIM Nuclide Activity 2 Sigma Error MDA Mn-54 <1.18E+01 0.00E+00 1.18E+01 Co-58 <9.76E+00 0.00E+00 9.76E+00 Fe-59 <2.70E+01 0.00E+00 2.70E+01 Co-60 <1.39E+01 0.00E+00 1.39E+01 Zn-65 <2.72E+01 0.00E+00 2.72E+01 Nb-95 <1.07E+01 0.00E+00 1.07E+01 I-131 <1.43E+01 0.00E+00 1.43E+01 Cs-134 <1.43E+01 0.00E+00 1.43E+01 Cs-137 <1.92E+01 0.00E+00 1.92E+01 Be-7 <1.09E+02 0.00E+00 1.09E+02 K-40 <8.53E+02 0.00E+00 8.53E+02 Ag-110M <1.18E+01 0.00E+00 1.18E+01 Sb-122 <2.57E+01 0.00E+00 2.57E+01 Sb-125 <3.78E+01 0.00E+00 3.78E+01 Sample ID: 374829 Sample Dates: 4/13/2015 - 4/14/2015 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Mn-54 <4.99E+00 0.00E+00 4.99E+00 Co-58 <5.58E+00 0.00E+00 5.58E+00 Fe-59 <1.49E+01 0.00E+00 1.49E+01 Co-60 <6.08E+00 0.00E+00 6.08E+00 Zn-65 <1.38E+01 0.00E+00 1.38E+01 Nb-95 <6.11E+00 0.00E+00 6.11E+00 I-131 <9.32E+00 0.00E+00 9.32E+00 Cs-134 <5.85E+00 0.00E+00 5.85E+00 Cs-137 1.11E+01 4.81E+00 6.39E+00 Be-7 <3.96E+01 0.00E+00 3.96E+01 K-40 2.78E+03 3.03E+02 9.23E+01 Ag-110M <4.58E+00 0.00E+00 4.58E+00 Sb-122 <4.42E+01 0.00E+00 4.42E+01 Sb-125 <1.26E+01 0.00E+00 1.26E+01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 59 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 391452 Sample Dates: 10/12/2015 - 10/12/2015 FREESWIM Nuclide Activity 2 Sigma Error MDA Mn-54 <8.63E+00 0.00E+00 8.63E+00 Co-58 <1.16E+01 0.00E+00 1.16E+01 Fe-59 <2.68E+01 0.00E+00 2.68E+01 Co-60 <1.41E+01 0.00E+00 1.41E+01 Zn-65 <3.28E+01 0.00E+00 3.28E+01 Nb-95 <1.39E+01 0.00E+00 1.39E+01 I-131 <1.20E+01 0.00E+00 1.20E+01 Cs-134 <1.56E+01 0.00E+00 1.56E+01 Cs-137 1.77E+01 1.17E+01 1.63E+01 Be-7 <1.23E+02 0.00E+00 1.23E+02 K-40 3.42E+03 5.20E+02 2.34E+02 Ag-110M <1.22E+01 0.00E+00 1.22E+01 Sb-122 <7.49E+01 0.00E+00 7.49E+01 Sb-125 <2.02E+01 0.00E+00 2.02E+01 Sample ID: 391453 Sample Dates: 10/12/2015 - 10/13/2015 BOTMFEEDER Nuclide Activity 2 Sigma Error MDA Mn-54 <1.20E+01 0.00E+00 1.20E+01 Co-58 <1.51E+01 0.00E+00 1.51E+01 Fe-59 <3.21E+01 0.00E+00 3.21E+01 Co-60 <1.90E+01 0.00E+00 1.90E+01 Zn-65 <3.68E+01 0.00E+00 3.68E+01 Nb-95 <8.63E+00 0.00E+00 8.63E+00 I-131 <2.13E+01 0.00E+00 2.13E+01 Cs-134 <1.64E+01 0.00E+00 1.64E+01 Cs-137 2.94E+01 1.54E+01 1.96E+01 Be-7 <1.37E+02 0.00E+00 1.37E+02 K-40 3.26E+03 5.64E+02 3.66E+02 Ag-110M <1.70E+01 0.00E+00 1.70E+01 Sb-122 <9.01E+01 0.00E+00 9.01E+01 Sb-125 <3.59E+01 0.00E+00 3.59E+01 Media Type: MILK Concentration (Activity): pCi/l Sample Point 071 [ CONTROL - SSE @ 10.2 miles ]

Sample ID: 365367 Sample Dates: 1/12/2015 - 1/12/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <6.28E-01 0.00E+00 6.28E-01 I-131 <3.73E+00 0.00E+00 3.73E+00 Cs-134 <4.27E+00 0.00E+00 4.27E+00 Cs-137 <3.59E+00 0.00E+00 3.59E+00 BaLa-140 <3.84E+00 0.00E+00 3.84E+00 Be-7 <3.68E+01 0.00E+00 3.68E+01 K-40 1.35E+03 1.72E+02 5.34E+01 Sample ID: 367126 Sample Dates: 1/26/2015 - 1/26/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <6.19E-01 0.00E+00 6.19E-01 I-131 <1.02E+01 0.00E+00 1.02E+01 Cs-134 <1.16E+01 0.00E+00 1.16E+01 Cs-137 <1.10E+01 0.00E+00 1.10E+01 BaLa-140 <1.06E+01 0.00E+00 1.06E+01 Be-7 <8.65E+01 0.00E+00 8.65E+01 K-40 1.52E+03 2.72E+02 1.34E+02 Sample ID: 369040 Sample Dates: 2/9/2015 - 2/9/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <6.21E-01 0.00E+00 6.21E-01 I-131 <7.52E+00 0.00E+00 7.52E+00 Cs-134 <7.84E+00 0.00E+00 7.84E+00 Cs-137 <8.17E+00 0.00E+00 8.17E+00 BaLa-140 <8.79E+00 0.00E+00 8.79E+00 Be-7 <6.06E+01 0.00E+00 6.06E+01 K-40 1.34E+03 2.26E+02 1.06E+02 Sample ID: 370667 Sample Dates: 2/23/2015 - 2/23/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <6.34E-01 0.00E+00 6.34E-01 I-131 <5.20E+00 0.00E+00 5.20E+00 Cs-134 <4.75E+00 0.00E+00 4.75E+00 Cs-137 <5.32E+00 0.00E+00 5.32E+00 BaLa-140 <3.90E+00 0.00E+00 3.90E+00 Be-7 <3.91E+01 0.00E+00 3.91E+01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 60 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 370667 Sample Dates: 2/23/2015 - 2/23/2015 Nuclide Activity 2 Sigma Error MDA K-40 1.41E+03 1.81E+02 8.26E+01 Sample ID: 371980 Sample Dates: 3/9/2015 - 3/9/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <5.51E-01 0.00E+00 5.51E-01 I-131 <3.97E+00 0.00E+00 3.97E+00 Cs-134 <4.93E+00 0.00E+00 4.93E+00 Cs-137 <4.03E+00 0.00E+00 4.03E+00 BaLa-140 <3.10E+00 0.00E+00 3.10E+00 Be-7 <3.15E+01 0.00E+00 3.15E+01 K-40 1.46E+03 1.82E+02 5.49E+01 Sample ID: 373922 Sample Dates: 3/23/2015 - 3/23/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <6.44E-01 0.00E+00 6.44E-01 I-131 <5.53E+00 0.00E+00 5.53E+00 Cs-134 <6.96E+00 0.00E+00 6.96E+00 Cs-137 <7.82E+00 0.00E+00 7.82E+00 BaLa-140 <9.91E+00 0.00E+00 9.91E+00 Be-7 <5.44E+01 0.00E+00 5.44E+01 K-40 1.14E+03 3.66E+02 7.26E+01 Sample ID: 375011 Sample Dates: 4/6/2015 - 4/6/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <6.15E-01 0.00E+00 6.15E-01 I-131 <7.59E+00 0.00E+00 7.59E+00 Cs-134 <7.60E+00 0.00E+00 7.60E+00 Cs-137 <7.58E+00 0.00E+00 7.58E+00 BaLa-140 <2.31E+00 0.00E+00 2.31E+00 Be-7 <3.47E+01 0.00E+00 3.47E+01 K-40 1.75E+03 2.56E+02 7.88E+01 Sample ID: 376895 Sample Dates: 4/20/2015 - 4/20/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <5.00E-01 0.00E+00 5.00E-01 I-131 <8.08E+00 0.00E+00 8.08E+00 Cs-134 <8.42E+00 0.00E+00 8.42E+00 Cs-137 <6.62E+00 0.00E+00 6.62E+00 BaLa-140 <6.07E+00 0.00E+00 6.07E+00 Be-7 <6.09E+01 0.00E+00 6.09E+01 K-40 1.45E+03 2.30E+02 8.53E+01 Sample ID: 378132 Sample Dates: 5/4/2015 - 5/4/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <5.78E-01 0.00E+00 5.78E-01 I-131 <5.54E+00 0.00E+00 5.54E+00 Cs-134 <7.54E+00 0.00E+00 7.54E+00 Cs-137 <7.49E+00 0.00E+00 7.49E+00 BaLa-140 <7.64E+00 0.00E+00 7.64E+00 Be-7 <3.77E+01 0.00E+00 3.77E+01 K-40 1.47E+03 2.35E+02 1.08E+02 Sample ID: 379017 Sample Dates: 5/18/2015 - 5/18/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <5.05E-01 0.00E+00 5.05E-01 I-131 <7.45E+00 0.00E+00 7.45E+00 Cs-134 <6.96E+00 0.00E+00 6.96E+00 Cs-137 <6.15E+00 0.00E+00 6.15E+00 BaLa-140 <2.33E+00 0.00E+00 2.33E+00 Be-7 <4.74E+01 0.00E+00 4.74E+01 K-40 1.41E+03 2.26E+02 7.74E+01 Sample ID: 380274 Sample Dates: 6/1/2015 - 6/1/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <5.17E-01 0.00E+00 5.17E-01 I-131 <6.75E+00 0.00E+00 6.75E+00 Cs-134 <4.93E+00 0.00E+00 4.93E+00 Cs-137 <7.82E+00 0.00E+00 7.82E+00 BaLa-140 <7.70E+00 0.00E+00 7.70E+00 Be-7 <4.70E+01 0.00E+00 4.70E+01 K-40 1.63E+03 2.50E+02 1.07E+02 Sample ID: 380867 Sample Dates: 6/15/2015 - 6/15/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <5.71E-01 0.00E+00 5.71E-01 I-131 <6.92E+00 0.00E+00 6.92E+00 Cs-134 <5.76E+00 0.00E+00 5.76E+00 Cs-137 <7.08E+00 0.00E+00 7.08E+00 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 61 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 380867 Sample Dates: 6/15/2015 - 6/15/2015 Nuclide Activity 2 Sigma Error MDA BaLa-140 <9.29E+00 0.00E+00 9.29E+00 Be-7 <5.75E+01 0.00E+00 5.75E+01 K-40 1.43E+03 2.38E+02 1.48E+02 Sample ID: 381660 Sample Dates: 6/29/2015 - 6/29/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <5.19E-01 0.00E+00 5.19E-01 I-131 <6.87E+00 0.00E+00 6.87E+00 Cs-134 <7.40E+00 0.00E+00 7.40E+00 Cs-137 <6.54E+00 0.00E+00 6.54E+00 BaLa-140 <5.93E+00 0.00E+00 5.93E+00 Be-7 <5.61E+01 0.00E+00 5.61E+01 K-40 1.37E+03 2.21E+02 8.40E+01 Sample ID: 382653 Sample Dates: 7/13/2015 - 7/13/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <4.45E-01 0.00E+00 4.45E-01 I-131 <4.78E+00 0.00E+00 4.78E+00 Cs-134 <7.88E+00 0.00E+00 7.88E+00 Cs-137 <7.73E+00 0.00E+00 7.73E+00 BaLa-140 <2.18E+00 0.00E+00 2.18E+00 Be-7 <5.15E+01 0.00E+00 5.15E+01 K-40 1.44E+03 2.36E+02 1.36E+02 Sample ID: 384154 Sample Dates: 7/27/2015 - 7/27/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <6.04E-01 0.00E+00 6.04E-01 I-131 <7.12E+00 0.00E+00 7.12E+00 Cs-134 <7.86E+00 0.00E+00 7.86E+00 Cs-137 <8.39E+00 0.00E+00 8.39E+00 BaLa-140 <6.18E+00 0.00E+00 6.18E+00 Be-7 <5.44E+01 0.00E+00 5.44E+01 K-40 1.38E+03 2.18E+02 1.72E+01 Sample ID: 385473 Sample Dates: 8/10/2015 - 8/10/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <5.26E-01 0.00E+00 5.26E-01 I-131 <5.87E+00 0.00E+00 5.87E+00 Cs-134 <8.34E+00 0.00E+00 8.34E+00 Cs-137 <1.10E+01 0.00E+00 1.10E+01 BaLa-140 <2.43E+00 0.00E+00 2.43E+00 Be-7 <4.33E+01 0.00E+00 4.33E+01 K-40 1.42E+03 2.30E+02 6.92E+01 Sample ID: 386886 Sample Dates: 8/24/2015 - 8/24/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <5.01E-01 0.00E+00 5.01E-01 I-131 <6.05E+00 0.00E+00 6.05E+00 Cs-134 <8.09E+00 0.00E+00 8.09E+00 Cs-137 <7.18E+00 0.00E+00 7.18E+00 BaLa-140 <6.07E+00 0.00E+00 6.07E+00 Be-7 <4.81E+01 0.00E+00 4.81E+01 K-40 1.33E+03 2.22E+02 1.18E+02 Sample ID: 388831 Sample Dates: 9/8/2015 - 9/8/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <5.20E-01 0.00E+00 5.20E-01 I-131 <7.29E+00 0.00E+00 7.29E+00 Cs-134 <7.27E+00 0.00E+00 7.27E+00 Cs-137 <8.54E+00 0.00E+00 8.54E+00 BaLa-140 <2.33E+00 0.00E+00 2.33E+00 Be-7 <4.60E+01 0.00E+00 4.60E+01 K-40 1.62E+03 2.55E+02 1.17E+02 Sample ID: 390072 Sample Dates: 9/21/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <6.47E-01 0.00E+00 6.47E-01 I-131 <5.19E+00 0.00E+00 5.19E+00 Cs-134 <6.38E+00 0.00E+00 6.38E+00 Cs-137 <5.05E+00 0.00E+00 5.05E+00 BaLa-140 <6.35E+00 0.00E+00 6.35E+00 Be-7 <6.73E+01 0.00E+00 6.73E+01 K-40 1.47E+03 2.36E+02 1.19E+02 Sample ID: 392021 Sample Dates: 10/5/2015 - 10/5/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <6.25E-01 0.00E+00 6.25E-01 I-131 <7.98E+00 0.00E+00 7.98E+00 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 62 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 392021 Sample Dates: 10/5/2015 - 10/5/2015 Nuclide Activity 2 Sigma Error MDA Cs-134 <5.16E+00 0.00E+00 5.16E+00 Cs-137 <8.89E+00 0.00E+00 8.89E+00 BaLa-140 <2.46E+00 0.00E+00 2.46E+00 Be-7 <5.25E+01 0.00E+00 5.25E+01 K-40 1.58E+03 2.51E+02 1.19E+02 Sample ID: 393492 Sample Dates: 10/19/2015 - 10/19/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <5.62E-01 0.00E+00 5.62E-01 I-131 <7.34E+00 0.00E+00 7.34E+00 Cs-134 <8.33E+00 0.00E+00 8.33E+00 Cs-137 <9.55E+00 0.00E+00 9.55E+00 BaLa-140 <6.35E+00 0.00E+00 6.35E+00 Be-7 <4.91E+01 0.00E+00 4.91E+01 K-40 1.45E+03 2.44E+02 1.50E+02 Sample ID: 394914 Sample Dates: 11/2/2015 - 11/2/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <6.46E-01 0.00E+00 6.46E-01 I-131 <5.52E+00 0.00E+00 5.52E+00 Cs-134 <7.86E+00 0.00E+00 7.86E+00 Cs-137 <8.06E+00 0.00E+00 8.06E+00 BaLa-140 <7.47E+00 0.00E+00 7.47E+00 Be-7 <4.65E+01 0.00E+00 4.65E+01 K-40 1.27E+03 2.13E+02 1.02E+02 Sample ID: 395691 Sample Dates: 11/16/2015 - 11/16/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <5.80E-01 0.00E+00 5.80E-01 I-131 <5.88E+00 0.00E+00 5.88E+00 Cs-134 <6.86E+00 0.00E+00 6.86E+00 Cs-137 <6.95E+00 0.00E+00 6.95E+00 BaLa-140 <2.19E+00 0.00E+00 2.19E+00 Be-7 <5.62E+01 0.00E+00 5.62E+01 K-40 1.60E+03 2.43E+02 8.82E+01 Sample ID: 396701 Sample Dates: 11/30/2015 - 11/30/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <5.17E-01 0.00E+00 5.17E-01 I-131 <5.22E+00 0.00E+00 5.22E+00 Cs-134 <6.42E+00 0.00E+00 6.42E+00 Cs-137 <9.19E+00 0.00E+00 9.19E+00 BaLa-140 <6.07E+00 0.00E+00 6.07E+00 Be-7 <4.71E+01 0.00E+00 4.71E+01 K-40 1.57E+03 2.40E+02 7.51E+01 Sample ID: 397956 Sample Dates: 12/14/2015 - 12/14/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <5.90E-01 0.00E+00 5.90E-01 I-131 <4.95E+00 0.00E+00 4.95E+00 Cs-134 <9.28E+00 0.00E+00 9.28E+00 Cs-137 <9.02E+00 0.00E+00 9.02E+00 BaLa-140 <2.44E+00 0.00E+00 2.44E+00 Be-7 <5.76E+01 0.00E+00 5.76E+01 K-40 1.39E+03 2.31E+02 8.93E+01 Sample ID: 398734 Sample Dates: 12/28/2015 - 12/28/2015 Nuclide Activity 2 Sigma Error MDA LLI-131 <6.43E-01 0.00E+00 6.43E-01 I-131 <4.89E+00 0.00E+00 4.89E+00 Cs-134 <7.97E+00 0.00E+00 7.97E+00 Cs-137 <8.51E+00 0.00E+00 8.51E+00 BaLa-140 <2.25E+00 0.00E+00 2.25E+00 Be-7 <5.68E+01 0.00E+00 5.68E+01 K-40 <1.38E+02 0.00E+00 1.38E+02 Media Type: SEDIMENT_SHORE Concentration (Activity): pCi/kg Sample Point 063 [ INDICATOR - ESE @ 0.8 miles ]

Sample ID: 374816 Sample Dates: 3/30/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <9.67E+00 0.00E+00 9.67E+00 Co-58 <9.34E+00 0.00E+00 9.34E+00 Fe-59 <2.51E+01 0.00E+00 2.51E+01 Co-60 <9.21E+00 0.00E+00 9.21E+00 Zn-65 <2.36E+01 0.00E+00 2.36E+01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 63 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 374816 Sample Dates: 3/30/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Zr-95 <1.63E+01 0.00E+00 1.63E+01 Nb-95 <1.08E+01 0.00E+00 1.08E+01 I-131 <2.95E+01 0.00E+00 2.95E+01 Cs-134 <1.36E+01 0.00E+00 1.36E+01 Cs-137 <1.06E+01 0.00E+00 1.06E+01 Be-7 1.79E+02 7.56E+01 1.18E+02 K-40 2.78E+04 2.27E+03 1.21E+02 Co-57 <7.84E+00 0.00E+00 7.84E+00 Mo-99 <3.91E+03 0.00E+00 3.91E+03 Ag-110M <7.35E+00 0.00E+00 7.35E+00 Sb-122 <6.49E+02 0.00E+00 6.49E+02 Sb-125 <2.04E+01 0.00E+00 2.04E+01 Sample ID: 390116 Sample Dates: 9/21/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <1.31E+01 0.00E+00 1.31E+01 Co-58 <1.15E+01 0.00E+00 1.15E+01 Fe-59 <3.20E+01 0.00E+00 3.20E+01 Co-60 <1.36E+01 0.00E+00 1.36E+01 Zn-65 <3.04E+01 0.00E+00 3.04E+01 Zr-95 <2.01E+01 0.00E+00 2.01E+01 Nb-95 <1.33E+01 0.00E+00 1.33E+01 I-131 <1.77E+01 0.00E+00 1.77E+01 Cs-134 <1.52E+01 0.00E+00 1.52E+01 Cs-137 2.24E+01 1.12E+01 1.73E+01 Be-7 <1.06E+02 0.00E+00 1.06E+02 K-40 2.93E+04 2.49E+03 2.11E+02 Co-57 <8.76E+00 0.00E+00 8.76E+00 Mo-99 <7.17E+02 0.00E+00 7.17E+02 Ag-110M <1.01E+01 0.00E+00 1.01E+01 Sb-122 <1.15E+02 0.00E+00 1.15E+02 Sb-125 <4.79E+01 0.00E+00 4.79E+01 Sample Point 067 [ INDICATOR - SSE @ 4.34 miles ]

Sample ID: 374817 Sample Dates: 3/30/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <5.48E+01 0.00E+00 5.48E+01 Co-58 <3.45E+01 0.00E+00 3.45E+01 Fe-59 <6.75E+01 0.00E+00 6.75E+01 Co-60 <3.44E+01 0.00E+00 3.44E+01 Zn-65 <7.28E+01 0.00E+00 7.28E+01 Zr-95 <9.61E+01 0.00E+00 9.61E+01 Nb-95 <4.73E+01 0.00E+00 4.73E+01 I-131 <8.61E+01 0.00E+00 8.61E+01 Cs-134 <8.94E+01 0.00E+00 8.94E+01 Cs-137 <4.77E+01 0.00E+00 4.77E+01 Be-7 <3.90E+02 0.00E+00 3.90E+02 K-40 9.94E+03 1.09E+03 6.02E+02 Co-57 <4.02E+01 0.00E+00 4.02E+01 Mo-99 <3.87E+03 0.00E+00 3.87E+03 Ag-110M <4.24E+01 0.00E+00 4.24E+01 Sb-122 <8.10E+02 0.00E+00 8.10E+02 Sb-125 <9.83E+01 0.00E+00 9.83E+01 Sample ID: 390117 Sample Dates: 9/21/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <1.20E+01 0.00E+00 1.20E+01 Co-58 <9.45E+00 0.00E+00 9.45E+00 Fe-59 <2.05E+01 0.00E+00 2.05E+01 Co-60 <9.23E+00 0.00E+00 9.23E+00 Zn-65 <3.05E+01 0.00E+00 3.05E+01 Zr-95 <2.08E+01 0.00E+00 2.08E+01 Nb-95 <1.13E+01 0.00E+00 1.13E+01 I-131 <1.75E+01 0.00E+00 1.75E+01 Cs-134 <1.59E+01 0.00E+00 1.59E+01 Cs-137 1.65E+01 1.04E+01 1.13E+01 Be-7 6.40E+01 6.12E+01 9.94E+01 K-40 1.30E+04 1.13E+03 1.56E+02 Co-57 <8.32E+00 0.00E+00 8.32E+00 Mo-99 <7.46E+02 0.00E+00 7.46E+02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 64 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 390117 Sample Dates: 9/21/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA Ag-110M <8.58E+00 0.00E+00 8.58E+00 Sb-122 <1.33E+02 0.00E+00 1.33E+02 Sb-125 <2.33E+01 0.00E+00 2.33E+01 Sample Point 068 [ CONTROL - W @ 1.82 miles ]

Sample ID: 374818 Sample Dates: 3/30/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <1.78E+01 0.00E+00 1.78E+01 Co-58 <1.99E+01 0.00E+00 1.99E+01 Fe-59 <4.76E+01 0.00E+00 4.76E+01 Co-60 <1.84E+01 0.00E+00 1.84E+01 Zn-65 <4.42E+01 0.00E+00 4.42E+01 Zr-95 <3.30E+01 0.00E+00 3.30E+01 Nb-95 <1.78E+01 0.00E+00 1.78E+01 I-131 <5.12E+01 0.00E+00 5.12E+01 Cs-134 <2.58E+01 0.00E+00 2.58E+01 Cs-137 <2.28E+01 0.00E+00 2.28E+01 Be-7 4.03E+02 1.55E+02 2.05E+02 K-40 4.39E+03 5.96E+02 1.89E+02 Co-57 <1.56E+01 0.00E+00 1.56E+01 Mo-99 <3.96E+03 0.00E+00 3.96E+03 Ag-110M <1.86E+01 0.00E+00 1.86E+01 Sb-122 <8.15E+02 0.00E+00 8.15E+02 Sb-125 <4.04E+01 0.00E+00 4.04E+01 Sample ID: 390118 Sample Dates: 9/21/2015 - 9/21/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <1.37E+01 0.00E+00 1.37E+01 Co-58 <1.36E+01 0.00E+00 1.36E+01 Fe-59 <3.40E+01 0.00E+00 3.40E+01 Co-60 <1.68E+01 0.00E+00 1.68E+01 Zn-65 <2.76E+01 0.00E+00 2.76E+01 Zr-95 <2.61E+01 0.00E+00 2.61E+01 Nb-95 <1.78E+01 0.00E+00 1.78E+01 I-131 <2.43E+01 0.00E+00 2.43E+01 Cs-134 <1.95E+01 0.00E+00 1.95E+01 Cs-137 <1.58E+01 0.00E+00 1.58E+01 Be-7 5.58E+01 1.01E+02 1.71E+02 K-40 5.47E+03 7.02E+02 3.06E+02 Co-57 <1.15E+01 0.00E+00 1.15E+01 Mo-99 <7.73E+02 0.00E+00 7.73E+02 Ag-110M <1.43E+01 0.00E+00 1.43E+01 Sb-122 <1.29E+02 0.00E+00 1.29E+02 Sb-125 <3.74E+01 0.00E+00 3.74E+01 Media Type: SURFACE WATER Concentration (Activity): pCi/l Sample Point 062 [ CONTROL - ENE @ 0.85 miles ]

Sample ID: 365144 Sample Dates: 12/8/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.74E+00 0.00E+00 2.74E+00 Co-58 <3.09E+00 0.00E+00 3.09E+00 Fe-59 <5.88E+00 0.00E+00 5.88E+00 Co-60 <2.50E+00 0.00E+00 2.50E+00 Zn-65 <4.70E+00 0.00E+00 4.70E+00 Zr-95 <5.30E+00 0.00E+00 5.30E+00 Nb-95 <3.80E+00 0.00E+00 3.80E+00 I-131 <1.20E+01 0.00E+00 1.20E+01 Cs-134 <2.95E+00 0.00E+00 2.95E+00 Cs-137 <2.37E+00 0.00E+00 2.37E+00 BaLa-140 <6.59E+00 0.00E+00 6.59E+00 Be-7 <2.41E+01 0.00E+00 2.41E+01 K-40 1.64E+02 3.42E+01 3.36E+01 Sample ID: 367623 Sample Dates: 1/5/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.97E+00 0.00E+00 2.97E+00 Co-58 <2.75E+00 0.00E+00 2.75E+00 Fe-59 <5.37E+00 0.00E+00 5.37E+00 Co-60 <2.82E+00 0.00E+00 2.82E+00 Zn-65 <5.19E+00 0.00E+00 5.19E+00 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 65 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 367623 Sample Dates: 1/5/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA Zr-95 <6.15E+00 0.00E+00 6.15E+00 Nb-95 <3.12E+00 0.00E+00 3.12E+00 I-131 <1.14E+01 0.00E+00 1.14E+01 Cs-134 <1.83E+00 0.00E+00 1.83E+00 Cs-137 <2.29E+00 0.00E+00 2.29E+00 BaLa-140 <5.97E+00 0.00E+00 5.97E+00 Be-7 <2.44E+01 0.00E+00 2.44E+01 K-40 3.17E+01 1.68E+01 2.26E+01 Sample ID: 371618 Sample Dates: 2/2/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <3.51E+00 0.00E+00 3.51E+00 Co-58 <2.93E+00 0.00E+00 2.93E+00 Fe-59 <8.57E+00 0.00E+00 8.57E+00 Co-60 <3.28E+00 0.00E+00 3.28E+00 Zn-65 <6.74E+00 0.00E+00 6.74E+00 Zr-95 <5.95E+00 0.00E+00 5.95E+00 Nb-95 <3.15E+00 0.00E+00 3.15E+00 I-131 <1.10E+01 0.00E+00 1.10E+01 Cs-134 <3.67E+00 0.00E+00 3.67E+00 Cs-137 <3.01E+00 0.00E+00 3.01E+00 BaLa-140 <9.05E+00 0.00E+00 9.05E+00 Be-7 <2.63E+01 0.00E+00 2.63E+01 K-40 2.92E+01 2.43E+01 3.59E+01 Sample ID: 372377 Sample Dates: 12/8/2014 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA H3SW <-5.9E+00 0.00E+00 1.85E+02 Sample ID: 374620 Sample Dates: 3/2/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.35E+00 0.00E+00 2.35E+00 Co-58 <2.08E+00 0.00E+00 2.08E+00 Fe-59 <4.67E+00 0.00E+00 4.67E+00 Co-60 <3.04E+00 0.00E+00 3.04E+00 Zn-65 <5.60E+00 0.00E+00 5.60E+00 Zr-95 <4.95E+00 0.00E+00 4.95E+00 Nb-95 <3.14E+00 0.00E+00 3.14E+00 I-131 <1.08E+01 0.00E+00 1.08E+01 Cs-134 <2.78E+00 0.00E+00 2.78E+00 Cs-137 <3.02E+00 0.00E+00 3.02E+00 BaLa-140 <6.58E+00 0.00E+00 6.58E+00 Be-7 <2.25E+01 0.00E+00 2.25E+01 K-40 6.39E+01 2.99E+01 3.92E+01 Sample ID: 377554 Sample Dates: 3/30/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <4.03E+00 0.00E+00 4.03E+00 Co-58 <3.42E+00 0.00E+00 3.42E+00 Fe-59 <9.33E+00 0.00E+00 9.33E+00 Co-60 <3.14E+00 0.00E+00 3.14E+00 Zn-65 <5.76E+00 0.00E+00 5.76E+00 Zr-95 <7.70E+00 0.00E+00 7.70E+00 Nb-95 <3.17E+00 0.00E+00 3.17E+00 I-131 <1.16E+01 0.00E+00 1.16E+01 Cs-134 <3.42E+00 0.00E+00 3.42E+00 Cs-137 <2.83E+00 0.00E+00 2.83E+00 BaLa-140 <6.77E+00 0.00E+00 6.77E+00 Be-7 <3.40E+01 0.00E+00 3.40E+01 K-40 3.16E+01 2.73E+01 4.05E+01 Sample ID: 379520 Sample Dates: 4/27/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.16E+00 0.00E+00 2.16E+00 Co-58 <2.41E+00 0.00E+00 2.41E+00 Fe-59 <5.93E+00 0.00E+00 5.93E+00 Co-60 <1.46E+00 0.00E+00 1.46E+00 Zn-65 <5.88E+00 0.00E+00 5.88E+00 Zr-95 <4.92E+00 0.00E+00 4.92E+00 Nb-95 <3.01E+00 0.00E+00 3.01E+00 I-131 <1.06E+01 0.00E+00 1.06E+01 Cs-134 <2.86E+00 0.00E+00 2.86E+00 Cs-137 <2.50E+00 0.00E+00 2.50E+00 BaLa-140 <5.89E+00 0.00E+00 5.89E+00 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 66 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 379520 Sample Dates: 4/27/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA Be-7 <2.27E+01 0.00E+00 2.27E+01 K-40 6.24E+01 2.58E+01 3.23E+01 Sample ID: 380275 Sample Dates: 3/2/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA H3SW <-1.6E+01 0.00E+00 1.89E+02 Sample ID: 381334 Sample Dates: 6/22/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.78E+00 0.00E+00 2.78E+00 Co-58 <3.65E+00 0.00E+00 3.65E+00 Fe-59 <5.55E+00 0.00E+00 5.55E+00 Co-60 <3.08E+00 0.00E+00 3.08E+00 Zn-65 <6.86E+00 0.00E+00 6.86E+00 Zr-95 <4.85E+00 0.00E+00 4.85E+00 Nb-95 <3.94E+00 0.00E+00 3.94E+00 I-131 <1.18E+01 0.00E+00 1.18E+01 Cs-134 <2.92E+00 0.00E+00 2.92E+00 Cs-137 <3.41E+00 0.00E+00 3.41E+00 BaLa-140 <9.09E+00 0.00E+00 9.09E+00 Be-7 <3.06E+01 0.00E+00 3.06E+01 K-40 5.36E+01 3.22E+01 4.39E+01 Sample ID: 383580 Sample Dates: 6/29/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.87E+00 0.00E+00 2.87E+00 Co-58 <3.67E+00 0.00E+00 3.67E+00 Fe-59 <8.64E+00 0.00E+00 8.64E+00 Co-60 <4.53E+00 0.00E+00 4.53E+00 Zn-65 <8.29E+00 0.00E+00 8.29E+00 Zr-95 <6.92E+00 0.00E+00 6.92E+00 Nb-95 <5.57E+00 0.00E+00 5.57E+00 I-131 <8.86E+00 0.00E+00 8.86E+00 Cs-134 <4.62E+00 0.00E+00 4.62E+00 Cs-137 <3.04E+00 0.00E+00 3.04E+00 BaLa-140 <1.11E+01 0.00E+00 1.11E+01 Be-7 <3.30E+01 0.00E+00 3.30E+01 K-40 <7.16E+01 0.00E+00 7.16E+01 Sample ID: 385989 Sample Dates: 7/20/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.13E+00 0.00E+00 2.13E+00 Co-58 <2.58E+00 0.00E+00 2.58E+00 Fe-59 <5.23E+00 0.00E+00 5.23E+00 Co-60 <3.09E+00 0.00E+00 3.09E+00 Zn-65 <4.27E+00 0.00E+00 4.27E+00 Zr-95 <5.59E+00 0.00E+00 5.59E+00 Nb-95 <3.03E+00 0.00E+00 3.03E+00 I-131 <8.62E+00 0.00E+00 8.62E+00 Cs-134 <2.73E+00 0.00E+00 2.73E+00 Cs-137 <2.58E+00 0.00E+00 2.58E+00 BaLa-140 <6.34E+00 0.00E+00 6.34E+00 Be-7 <2.54E+01 0.00E+00 2.54E+01 K-40 2.48E+01 1.95E+01 2.85E+01 Sample ID: 388128 Sample Dates: 5/26/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA H3SW <6.33E+01 0.00E+00 1.96E+02 Sample ID: 389469 Sample Dates: 8/17/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.77E+00 0.00E+00 2.77E+00 Co-58 <2.86E+00 0.00E+00 2.86E+00 Fe-59 <3.82E+00 0.00E+00 3.82E+00 Co-60 <4.77E+00 0.00E+00 4.77E+00 Zn-65 <5.21E+00 0.00E+00 5.21E+00 Zr-95 <6.43E+00 0.00E+00 6.43E+00 Nb-95 <3.45E+00 0.00E+00 3.45E+00 I-131 <1.16E+01 0.00E+00 1.16E+01 Cs-134 <3.26E+00 0.00E+00 3.26E+00 Cs-137 <4.05E+00 0.00E+00 4.05E+00 BaLa-140 <8.79E+00 0.00E+00 8.79E+00 Be-7 <4.12E+01 0.00E+00 4.12E+01 K-40 3.44E+01 2.90E+01 4.30E+01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 67 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 392291 Sample Dates: 9/14/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.21E+00 0.00E+00 2.21E+00 Co-58 <2.60E+00 0.00E+00 2.60E+00 Fe-59 <5.72E+00 0.00E+00 5.72E+00 Co-60 <2.00E+00 0.00E+00 2.00E+00 Zn-65 <4.63E+00 0.00E+00 4.63E+00 Zr-95 <4.35E+00 0.00E+00 4.35E+00 Nb-95 <2.39E+00 0.00E+00 2.39E+00 I-131 <1.19E+01 0.00E+00 1.19E+01 Cs-134 <2.44E+00 0.00E+00 2.44E+00 Cs-137 <2.28E+00 0.00E+00 2.28E+00 BaLa-140 <5.23E+00 0.00E+00 5.23E+00 Be-7 <1.99E+01 0.00E+00 1.99E+01 K-40 5.72E+01 2.27E+01 2.78E+01 Sample ID: 395364 Sample Dates: 10/12/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.50E+00 0.00E+00 2.50E+00 Co-58 <2.27E+00 0.00E+00 2.27E+00 Fe-59 <5.01E+00 0.00E+00 5.01E+00 Co-60 <2.31E+00 0.00E+00 2.31E+00 Zn-65 <4.46E+00 0.00E+00 4.46E+00 Zr-95 <4.30E+00 0.00E+00 4.30E+00 Nb-95 <3.05E+00 0.00E+00 3.05E+00 I-131 <9.91E+00 0.00E+00 9.91E+00 Cs-134 <2.18E+00 0.00E+00 2.18E+00 Cs-137 <2.63E+00 0.00E+00 2.63E+00 BaLa-140 <5.72E+00 0.00E+00 5.72E+00 Be-7 <2.32E+01 0.00E+00 2.32E+01 K-40 4.21E+01 2.42E+01 3.40E+01 Sample ID: 397103 Sample Dates: 8/17/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA H3SW <-3.4E+01 0.00E+00 1.98E+02 Sample ID: 397250 Sample Dates: 11/9/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.73E+00 0.00E+00 2.73E+00 Co-58 <2.74E+00 0.00E+00 2.74E+00 Fe-59 <5.42E+00 0.00E+00 5.42E+00 Co-60 <3.43E+00 0.00E+00 3.43E+00 Zn-65 <5.04E+00 0.00E+00 5.04E+00 Zr-95 <4.46E+00 0.00E+00 4.46E+00 Nb-95 <3.42E+00 0.00E+00 3.42E+00 I-131 <1.18E+01 0.00E+00 1.18E+01 Cs-134 <3.12E+00 0.00E+00 3.12E+00 Cs-137 <3.09E+00 0.00E+00 3.09E+00 BaLa-140 <8.92E+00 0.00E+00 8.92E+00 Be-7 <2.71E+01 0.00E+00 2.71E+01 K-40 6.00E+01 2.44E+01 2.44E+01 Sample Point 063.1 [ INDICATOR - E @ 0.79 miles ]

Sample ID: 365145 Sample Dates: 12/8/2014 - 1/5/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.26E+00 0.00E+00 2.26E+00 Co-58 <2.07E+00 0.00E+00 2.07E+00 Fe-59 <5.31E+00 0.00E+00 5.31E+00 Co-60 <2.45E+00 0.00E+00 2.45E+00 Zn-65 <4.67E+00 0.00E+00 4.67E+00 Zr-95 <4.43E+00 0.00E+00 4.43E+00 Nb-95 <3.49E+00 0.00E+00 3.49E+00 I-131 <1.13E+01 0.00E+00 1.13E+01 Cs-134 <2.74E+00 0.00E+00 2.74E+00 Cs-137 <2.31E+00 0.00E+00 2.31E+00 BaLa-140 <6.58E+00 0.00E+00 6.58E+00 Be-7 <2.05E+01 0.00E+00 2.05E+01 K-40 2.99E+01 1.48E+01 2.61E+01 Sample ID: 367624 Sample Dates: 1/5/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <3.17E+00 0.00E+00 3.17E+00 Co-58 <3.32E+00 0.00E+00 3.32E+00 Fe-59 <5.59E+00 0.00E+00 5.59E+00 Co-60 <2.78E+00 0.00E+00 2.78E+00 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 68 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 367624 Sample Dates: 1/5/2015 - 2/2/2015 Nuclide Activity 2 Sigma Error MDA Zn-65 <5.88E+00 0.00E+00 5.88E+00 Zr-95 <3.45E+00 0.00E+00 3.45E+00 Nb-95 <3.68E+00 0.00E+00 3.68E+00 I-131 <1.19E+01 0.00E+00 1.19E+01 Cs-134 <3.36E+00 0.00E+00 3.36E+00 Cs-137 <2.88E+00 0.00E+00 2.88E+00 BaLa-140 <9.32E+00 0.00E+00 9.32E+00 Be-7 <2.41E+01 0.00E+00 2.41E+01 K-40 2.00E+01 2.18E+01 3.49E+01 Sample ID: 371619 Sample Dates: 2/2/2015 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <1.73E+00 0.00E+00 1.73E+00 Co-58 <2.89E+00 0.00E+00 2.89E+00 Fe-59 <6.02E+00 0.00E+00 6.02E+00 Co-60 <3.01E+00 0.00E+00 3.01E+00 Zn-65 <6.54E+00 0.00E+00 6.54E+00 Zr-95 <4.74E+00 0.00E+00 4.74E+00 Nb-95 <3.59E+00 0.00E+00 3.59E+00 I-131 <1.05E+01 0.00E+00 1.05E+01 Cs-134 <3.00E+00 0.00E+00 3.00E+00 Cs-137 <2.89E+00 0.00E+00 2.89E+00 BaLa-140 <7.26E+00 0.00E+00 7.26E+00 Be-7 <2.56E+01 0.00E+00 2.56E+01 K-40 3.16E+01 2.53E+01 3.87E+01 Sample ID: 372378 Sample Dates: 12/8/2014 - 3/2/2015 Nuclide Activity 2 Sigma Error MDA H3SW 7.37E+03 2.40E+02 1.84E+02 Sample ID: 374621 Sample Dates: 3/2/2015 - 3/30/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.79E+00 0.00E+00 2.79E+00 Co-58 <3.51E+00 0.00E+00 3.51E+00 Fe-59 <8.37E+00 0.00E+00 8.37E+00 Co-60 <4.23E+00 0.00E+00 4.23E+00 Zn-65 <7.50E+00 0.00E+00 7.50E+00 Zr-95 <5.51E+00 0.00E+00 5.51E+00 Nb-95 <4.22E+00 0.00E+00 4.22E+00 I-131 <1.06E+01 0.00E+00 1.06E+01 Cs-134 <3.49E+00 0.00E+00 3.49E+00 Cs-137 <3.26E+00 0.00E+00 3.26E+00 BaLa-140 <1.05E+01 0.00E+00 1.05E+01 Be-7 <3.52E+01 0.00E+00 3.52E+01 K-40 1.07E+02 4.18E+01 5.03E+01 Sample ID: 377555 Sample Dates: 3/30/2015 - 4/27/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.31E+00 0.00E+00 2.31E+00 Co-58 <3.47E+00 0.00E+00 3.47E+00 Fe-59 <6.36E+00 0.00E+00 6.36E+00 Co-60 <2.25E+00 0.00E+00 2.25E+00 Zn-65 <5.72E+00 0.00E+00 5.72E+00 Zr-95 <5.35E+00 0.00E+00 5.35E+00 Nb-95 <3.74E+00 0.00E+00 3.74E+00 I-131 <1.07E+01 0.00E+00 1.07E+01 Cs-134 <3.47E+00 0.00E+00 3.47E+00 Cs-137 <2.56E+00 0.00E+00 2.56E+00 BaLa-140 <6.20E+00 0.00E+00 6.20E+00 Be-7 <2.18E+01 0.00E+00 2.18E+01 K-40 2.62E+01 2.38E+01 3.68E+01 Sample ID: 379521 Sample Dates: 4/27/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.87E+00 0.00E+00 2.87E+00 Co-58 <3.41E+00 0.00E+00 3.41E+00 Fe-59 <5.88E+00 0.00E+00 5.88E+00 Co-60 <2.56E+00 0.00E+00 2.56E+00 Zn-65 <6.02E+00 0.00E+00 6.02E+00 Zr-95 <4.87E+00 0.00E+00 4.87E+00 Nb-95 <3.51E+00 0.00E+00 3.51E+00 I-131 <1.14E+01 0.00E+00 1.14E+01 Cs-134 <3.84E+00 0.00E+00 3.84E+00 Cs-137 <2.96E+00 0.00E+00 2.96E+00 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 69 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 379521 Sample Dates: 4/27/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA BaLa-140 <7.40E+00 0.00E+00 7.40E+00 Be-7 <2.49E+01 0.00E+00 2.49E+01 K-40 2.97E+01 1.91E+01 2.40E+01 Sample ID: 380276 Sample Dates: 3/2/2015 - 5/26/2015 Nuclide Activity 2 Sigma Error MDA H3SW 4.46E+03 1.99E+02 1.88E+02 Sample ID: 381335 Sample Dates: 5/26/2015 - 6/22/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <3.67E+00 0.00E+00 3.67E+00 Co-58 <3.58E+00 0.00E+00 3.58E+00 Fe-59 <1.04E+01 0.00E+00 1.04E+01 Co-60 <2.42E+00 0.00E+00 2.42E+00 Zn-65 <7.93E+00 0.00E+00 7.93E+00 Zr-95 <6.34E+00 0.00E+00 6.34E+00 Nb-95 <5.36E+00 0.00E+00 5.36E+00 I-131 <1.14E+01 0.00E+00 1.14E+01 Cs-134 <3.55E+00 0.00E+00 3.55E+00 Cs-137 <3.10E+00 0.00E+00 3.10E+00 BaLa-140 <1.13E+01 0.00E+00 1.13E+01 Be-7 <3.47E+01 0.00E+00 3.47E+01 K-40 <5.43E+01 0.00E+00 5.43E+01 Sample ID: 383581 Sample Dates: 6/22/2015 - 7/20/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <3.55E+00 0.00E+00 3.55E+00 Co-58 <3.71E+00 0.00E+00 3.71E+00 Fe-59 <5.28E+00 0.00E+00 5.28E+00 Co-60 <1.80E+00 0.00E+00 1.80E+00 Zn-65 <7.50E+00 0.00E+00 7.50E+00 Zr-95 <7.29E+00 0.00E+00 7.29E+00 Nb-95 <5.34E+00 0.00E+00 5.34E+00 I-131 <1.20E+01 0.00E+00 1.20E+01 Cs-134 <3.93E+00 0.00E+00 3.93E+00 Cs-137 <3.06E+00 0.00E+00 3.06E+00 BaLa-140 <6.74E+00 0.00E+00 6.74E+00 Be-7 <3.07E+01 0.00E+00 3.07E+01 K-40 <6.05E+01 0.00E+00 6.05E+01 Sample ID: 385990 Sample Dates: 7/20/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.53E+00 0.00E+00 2.53E+00 Co-58 <2.50E+00 0.00E+00 2.50E+00 Fe-59 <5.06E+00 0.00E+00 5.06E+00 Co-60 <2.24E+00 0.00E+00 2.24E+00 Zn-65 <5.51E+00 0.00E+00 5.51E+00 Zr-95 <5.54E+00 0.00E+00 5.54E+00 Nb-95 <4.19E+00 0.00E+00 4.19E+00 I-131 <1.14E+01 0.00E+00 1.14E+01 Cs-134 <2.72E+00 0.00E+00 2.72E+00 Cs-137 <2.23E+00 0.00E+00 2.23E+00 BaLa-140 <6.62E+00 0.00E+00 6.62E+00 Be-7 <2.15E+01 0.00E+00 2.15E+01 K-40 5.49E+01 2.62E+01 3.36E+01 Sample ID: 388129 Sample Dates: 5/26/2015 - 8/17/2015 Nuclide Activity 2 Sigma Error MDA H3SW 9.19E+03 2.70E+02 2.00E+02 Sample ID: 389470 Sample Dates: 8/17/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <2.42E+00 0.00E+00 2.42E+00 Co-58 <4.06E+00 0.00E+00 4.06E+00 Fe-59 <3.93E+00 0.00E+00 3.93E+00 Co-60 <3.82E+00 0.00E+00 3.82E+00 Zn-65 <7.02E+00 0.00E+00 7.02E+00 Zr-95 <6.30E+00 0.00E+00 6.30E+00 Nb-95 <5.06E+00 0.00E+00 5.06E+00 I-131 <1.17E+01 0.00E+00 1.17E+01 Cs-134 <3.89E+00 0.00E+00 3.89E+00 Cs-137 <4.27E+00 0.00E+00 4.27E+00 BaLa-140 <6.97E+00 0.00E+00 6.97E+00 Be-7 <3.54E+01 0.00E+00 3.54E+01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 70 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 389470 Sample Dates: 8/17/2015 - 9/14/2015 Nuclide Activity 2 Sigma Error MDA K-40 <5.87E+01 0.00E+00 5.87E+01 Sample ID: 392292 Sample Dates: 9/14/2015 - 10/12/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <1.70E+00 0.00E+00 1.70E+00 Co-58 <1.77E+00 0.00E+00 1.77E+00 Fe-59 <3.66E+00 0.00E+00 3.66E+00 Co-60 <1.86E+00 0.00E+00 1.86E+00 Zn-65 <3.81E+00 0.00E+00 3.81E+00 Zr-95 <3.42E+00 0.00E+00 3.42E+00 Nb-95 <2.37E+00 0.00E+00 2.37E+00 I-131 <1.06E+01 0.00E+00 1.06E+01 Cs-134 <1.83E+00 0.00E+00 1.83E+00 Cs-137 <2.06E+00 0.00E+00 2.06E+00 BaLa-140 <4.70E+00 0.00E+00 4.70E+00 Be-7 <2.08E+01 0.00E+00 2.08E+01 K-40 2.82E+01 1.62E+01 2.26E+01 Sample ID: 395365 Sample Dates: 10/12/2015 - 11/9/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <3.49E+00 0.00E+00 3.49E+00 Co-58 <3.14E+00 0.00E+00 3.14E+00 Fe-59 <5.72E+00 0.00E+00 5.72E+00 Co-60 <3.23E+00 0.00E+00 3.23E+00 Zn-65 <6.49E+00 0.00E+00 6.49E+00 Zr-95 <6.87E+00 0.00E+00 6.87E+00 Nb-95 <3.97E+00 0.00E+00 3.97E+00 I-131 <1.12E+01 0.00E+00 1.12E+01 Cs-134 <2.91E+00 0.00E+00 2.91E+00 Cs-137 <3.89E+00 0.00E+00 3.89E+00 BaLa-140 <9.86E+00 0.00E+00 9.86E+00 Be-7 <3.41E+01 0.00E+00 3.41E+01 K-40 2.13E+01 2.57E+01 4.14E+01 Sample ID: 397104 Sample Dates: 8/17/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA H3SW 9.90E+03 2.78E+02 2.00E+02 Sample ID: 397251 Sample Dates: 11/9/2015 - 12/7/2015 Nuclide Activity 2 Sigma Error MDA Mn-54 <3.07E+00 0.00E+00 3.07E+00 Co-58 <3.33E+00 0.00E+00 3.33E+00 Fe-59 <6.90E+00 0.00E+00 6.90E+00 Co-60 <2.98E+00 0.00E+00 2.98E+00 Zn-65 <6.19E+00 0.00E+00 6.19E+00 Zr-95 <5.30E+00 0.00E+00 5.30E+00 Nb-95 <3.57E+00 0.00E+00 3.57E+00 I-131 <1.06E+01 0.00E+00 1.06E+01 Cs-134 <3.06E+00 0.00E+00 3.06E+00 Cs-137 <2.60E+00 0.00E+00 2.60E+00 BaLa-140 <7.56E+00 0.00E+00 7.56E+00 Be-7 <2.10E+01 0.00E+00 2.10E+01 K-40 <3.97E+01 0.00E+00 3.97E+01 Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 020 [ INDICATOR - N @ 0.16 miles ] TLD RING TLD_INNER Sample ID: 371374 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 19.68 Sample ID: 380025 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 20.77 Sample ID: 387973 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 18.63 Sample ID: 396948 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 19.24 Sample Point 021 [ INDICATOR - NNE @ 0.25 miles ] TLD RING TLD_INNER Sample ID: 371375 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 15.58 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 71 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 021 [ INDICATOR - NNE @ 0.25 miles ] TLD RING TLD_INNER Sample ID: 380026 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 15.73 Sample ID: 387974 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 14.12 Sample ID: 396949 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 14.30 Sample Point 022 [ INDICATOR - NE @ 0.53 miles ] TLD RING TLD_INNER Sample ID: 371376 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 23.76 Sample ID: 380027 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 23.68 Sample ID: 387975 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 21.89 Sample ID: 396950 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 22.41 Sample Point 023 [ INDICATOR - ENE @ 0.93 miles ] TLD RING TLD_INNER Sample ID: 371377 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 24.29 Sample ID: 380028 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 23.00 Sample ID: 387976 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 22.38 Sample ID: 396951 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 23.78 Sample Point 024 [ INDICATOR - E @ 0.81 miles ] TLD RING TLD_INNER Sample ID: 371378 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 28.55 Sample ID: 380029 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 23.89 Sample ID: 387977 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 23.64 Sample ID: 396952 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 24.35 Sample Point 025 [ INDICATOR - ESE @ 0.42 miles ] TLD RING TLD_INNER Sample ID: 371379 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 21.53 Sample ID: 380030 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 16.78 Sample ID: 387978 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 17.67 Sample ID: 396953 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 18.23 Sample Point 026 [ INDICATOR - SE @ 0.34 miles ] TLD RING TLD_INNER Sample ID: 371380 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 16.88 Sample ID: 380031 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 18.68 Sample ID: 387979 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 15.43 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 72 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 026 [ INDICATOR - SE @ 0.34 miles ] TLD RING TLD_INNER Sample ID: 396954 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 16.45 Sample Point 027 [ INDICATOR - SSE @ 0.49 miles ] TLD RING TLD_INNER Sample ID: 371381 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 21.44 Sample ID: 380032 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 19.51 Sample ID: 387980 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 18.46 Sample ID: 396955 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 20.61 Sample Point 028 [ INDICATOR - S @ 0.46 miles ] TLD RING TLD_INNER Sample ID: 371382 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 20.04 Sample ID: 380033 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 17.26 Sample ID: 387981 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 15.30 Sample ID: 396956 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 19.03 Sample Point 029 [ INDICATOR - SSW @ 0.56 miles ] TLD RING TLD_INNER Sample ID: 371383 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 19.01 Sample ID: 380034 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 16.25 Sample ID: 387982 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 15.05 Sample ID: 396957 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 16.03 Sample Point 030 [ INDICATOR - SW @ 0.42 miles ] TLD RING TLD_INNER Sample ID: 371384 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 19.80 Sample ID: 380035 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 17.65 Sample ID: 387983 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 17.15 Sample ID: 396958 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 18.71 Sample Point 031 [ INDICATOR - WSW @ 0.27 miles ] TLD RING TLD_INNER Sample ID: 371385 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 19.26 Sample ID: 380036 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 15.37 Sample ID: 387984 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 15.98 Sample ID: 396959 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 17.55 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 73 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 032 [ INDICATOR - WNW @ 0.19 miles ] TLD RING TLD_INNER Sample ID: 371386 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 22.62 Sample ID: 380037 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 18.60 Sample ID: 387985 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 17.70 Sample ID: 396960 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 20.01 Sample Point 033 [ INDICATOR - WNW @ 0.21 miles ] TLD RING TLD_INNER Sample ID: 371387 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 18.31 Sample ID: 380038 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 16.70 Sample ID: 387986 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 15.21 Sample ID: 396961 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 18.15 Sample Point 034 [ INDICATOR - NW @ 0.22 miles ] TLD RING TLD_INNER Sample ID: 371388 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 20.09 Sample ID: 380039 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 16.73 Sample ID: 387987 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 17.27 Sample ID: 396962 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 19.04 Sample Point 035 [ INDICATOR - NNW @ 0.17 miles ] TLD RING TLD_INNER Sample ID: 371389 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 26.94 Sample ID: 380040 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 24.62 Sample ID: 387988 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 23.82 Sample ID: 396963 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 24.19 Sample Point 036 [ INDICATOR - N @ 4.18 miles ] TLD RING TLD_OUTER Sample ID: 371390 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 26.89 Sample ID: 380041 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 23.26 Sample ID: 387989 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 23.81 Sample ID: 396964 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 22.90 Sample Point 037 [ INDICATOR - NNE @ 4.85 miles ] TLD RING TLD_OUTER Sample ID: 371391 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 21.62 Sample ID: 380042 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 18.00 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 74 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 037 [ INDICATOR - NNE @ 4.85 miles ] TLD RING TLD_OUTER Sample ID: 387990 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 20.34 Sample ID: 396965 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 18.44 Sample Point 038 [ INDICATOR - NE @ 4.24 miles ] TLD RING TLD_OUTER Sample ID: 371392 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 23.40 Sample ID: 380043 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 22.68 Sample ID: 387991 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 23.69 Sample ID: 396966 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 24.88 Sample Point 039 [ INDICATOR - ENE @ 4.02 miles ] TLD RING TLD_OUTER Sample ID: 371393 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 26.21 Sample ID: 380044 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 25.68 Sample ID: 387992 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 24.49 Sample ID: 396967 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 26.66 Sample Point 040 [ INDICATOR - E @ 4.74 miles ] TLD RING TLD_OUTER Sample ID: 371394 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 30.34 Sample ID: 380045 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 27.16 Sample ID: 387993 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 24.40 Sample ID: 396968 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 27.56 Sample Point 041 [ INDICATOR - ESE @ 4.25 miles ] TLD RING TLD_OUTER Sample ID: 371395 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 19.70 Sample ID: 380046 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 16.01 Sample ID: 387994 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 15.82 Sample ID: 396969 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 19.11 Sample Point 042 [ INDICATOR - SE @ 4.93 miles ] TLD RING TLD_OUTER Sample ID: 371396 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 29.27 Sample ID: 380047 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 25.77 Sample ID: 387995 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 25.00 Sample ID: 396970 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 28.02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 75 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 043 [ INDICATOR - SSE @ 4.09 miles ] TLD RING TLD_OUTER Sample ID: 371397 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 25.87 Sample ID: 380048 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 23.66 Sample ID: 387996 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 25.80 Sample ID: 396971 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 26.32 Sample Point 044 [ INDICATOR - S @ 3.96 miles ] TLD RING TLD_OUTER Sample ID: 371398 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 20.71 Sample ID: 380049 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 17.86 Sample ID: 387997 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 17.37 Sample ID: 396972 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 18.71 Sample Point 045 [ INDICATOR - SSW @ 4.78 miles ] TLD RING TLD_OUTER Sample ID: 371399 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 18.56 Sample ID: 380050 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 16.93 Sample ID: 387998 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 16.46 Sample ID: 396973 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 16.99 Sample Point 046 [ INDICATOR - SW @ 4.61 miles ] TLD RING TLD_OUTER Sample ID: 371400 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 28.13 Sample ID: 380051 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 22.27 Sample ID: 387999 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 22.35 Sample ID: 396974 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 23.81 Sample Point 047 [ INDICATOR - WSW @ 3.58 miles ] TLD RING TLD_OUTER Sample ID: 371401 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 25.61 Sample ID: 380052 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 22.66 Sample ID: 388000 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 20.60 Sample ID: 396975 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 22.95 Sample Point 048 [ INDICATOR - W @ 3.64 miles ] TLD RING TLD_OUTER Sample ID: 371402 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 31.27 Sample ID: 380053 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 25.80 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 76 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 048 [ INDICATOR - W @ 3.64 miles ] TLD RING TLD_OUTER Sample ID: 388001 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 23.24 Sample ID: 396976 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 24.85 Sample Point 049 [ INDICATOR - WNW @ 3.6 miles ] TLD RING TLD_OUTER Sample ID: 371403 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 28.63 Sample ID: 380054 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 21.70 Sample ID: 388002 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 22.89 Sample ID: 396977 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 21.93 Sample Point 050 [ INDICATOR - NW @ 3.53 miles ] TLD RING TLD_OUTER Sample ID: 371404 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 19.38 Sample ID: 380055 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 20.36 Sample ID: 388003 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 17.25 Sample ID: 396978 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 25.21 Sample Point 051 [ INDICATOR - NNW @ 4.64 miles ] TLD RING TLD_OUTER Sample ID: 371405 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 25.63 Sample ID: 380056 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 18.84 Sample ID: 388004 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 19.63 Sample ID: 396979 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 18.98 Sample Point 052 [ INDICATOR - ENE @ 12.4 miles ] TLD RING TLD_SPEC Sample ID: 371406 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 28.99 Sample ID: 380057 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 24.37 Sample ID: 388005 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 23.74 Sample ID: 396980 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 25.63 Sample Point 053 [ INDICATOR - E @ 11.7 miles ] TLD RING TLD_SPEC Sample ID: 371407 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 29.86 Sample ID: 380058 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 25.97 Sample ID: 388006 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 23.46 Sample ID: 396981 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 26.22 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 77 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 054 [ INDICATOR - ESE @ 8.6 miles ] TLD RING TLD_SPEC Sample ID: 371408 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 22.41 Sample ID: 380059 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 18.52 Sample ID: 388007 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 17.34 Sample ID: 396982 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 18.52 Sample Point 055 [ INDICATOR - SSE @ 9.27 miles ] TLD RING TLD_SPEC Sample ID: 371409 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 19.83 Sample ID: 380060 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 15.74 Sample ID: 388008 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 16.81 Sample ID: 396983 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 18.11 Sample Point 056 [ INDICATOR - SSW @ 7.3 miles ] TLD RING TLD_SPEC Sample ID: 371410 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 35.15 Sample ID: 380061 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 22.75 Sample ID: 388009 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 23.48 Sample ID: 396984 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 25.60 Sample Point 057 [ INDICATOR - SW @ 8.42 miles ] TLD RING TLD_SPEC Sample ID: 371411 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 25.33 Sample ID: 380062 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 24.02 Sample ID: 388010 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 22.98 Sample ID: 396985 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 24.71 Sample Point 058 [ CONTROL - WSW @ 9.39 miles ] TLD RING TLD_CTRL Sample ID: 371412 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 32.96 Sample ID: 380063 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 32.90 Sample ID: 388011 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 29.88 Sample ID: 396986 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 31.10 Sample Point 059 [ INDICATOR - NW @ 9.2 miles ] TLD RING TLD_SPEC Sample ID: 371413 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 26.46 Sample ID: 380064 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 24.30 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 78 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

Media Type: TLD Concentration (Activity): mR/Standard Quarter Sample Point 059 [ INDICATOR - NW @ 9.2 miles ] TLD RING TLD_SPEC Sample ID: 388012 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 25.85 Sample ID: 396987 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 25.31 Sample Point 076 [ INDICATOR - W @ 0.19 miles ] TLD RING TLD_INNER Sample ID: 371414 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 23.36 Sample ID: 380065 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 21.97 Sample ID: 388013 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 23.73 Sample ID: 396988 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 24.39 Sample Point 081 [ CONTROL - SE @ 9.33 miles ] TLD RING TLD_CTRL Sample ID: 371415 Sample Dates: 12/17/2014 - 3/17/2015 Nuclide Activity mR/Std Qtr 25.30 Sample ID: 380066 Sample Dates: 3/17/2015 - 6/16/2015 Nuclide Activity mR/Std Qtr 21.89 Sample ID: 388014 Sample Dates: 6/16/2015 - 9/15/2015 Nuclide Activity mR/Std Qtr 22.23 Sample ID: 396989 Sample Dates: 9/15/2015 - 12/15/2015 Nuclide Activity mR/Std Qtr 23.60 Media Type: VEGETATION Concentration (Activity): pCi/kg wet Sample Point 077 [ INDICATOR - SW @ 1 miles ]

Sample ID: 365140 Sample Dates: 1/5/2015 - 1/5/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.44E+01 0.00E+00 2.44E+01 Co-58 <3.16E+01 0.00E+00 3.16E+01 Fe-59 <5.56E+01 0.00E+00 5.56E+01 Co-60 <3.76E+01 0.00E+00 3.76E+01 Zn-65 <7.77E+01 0.00E+00 7.77E+01 Zr-95 <5.82E+01 0.00E+00 5.82E+01 Nb-95 <3.44E+01 0.00E+00 3.44E+01 I-131 <2.49E+01 0.00E+00 2.49E+01 Cs-134 <3.56E+01 0.00E+00 3.56E+01 Cs-137 <3.54E+01 0.00E+00 3.54E+01 BaLa-140 <2.32E+01 0.00E+00 2.32E+01 Be-7 3.94E+03 5.70E+02 3.91E+02 K-40 3.07E+03 6.38E+02 4.37E+02 Sample ID: 367619 Sample Dates: 2/2/2015 - 2/2/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.76E+01 0.00E+00 3.76E+01 Co-58 <3.15E+01 0.00E+00 3.15E+01 Fe-59 <8.23E+01 0.00E+00 8.23E+01 Co-60 <4.38E+01 0.00E+00 4.38E+01 Zn-65 <9.87E+01 0.00E+00 9.87E+01 Zr-95 <5.17E+01 0.00E+00 5.17E+01 Nb-95 <3.35E+01 0.00E+00 3.35E+01 I-131 <2.81E+01 0.00E+00 2.81E+01 Cs-134 <4.37E+01 0.00E+00 4.37E+01 Cs-137 <4.65E+01 0.00E+00 4.65E+01 BaLa-140 <5.81E+01 0.00E+00 5.81E+01 Be-7 3.42E+03 5.73E+02 4.67E+02 K-40 <1.56E+03 0.00E+00 1.56E+03 Sample ID: 371614 Sample Dates: 3/2/2015 - 3/2/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.44E+01 0.00E+00 2.44E+01 Co-58 <1.68E+01 0.00E+00 1.68E+01 Fe-59 <4.81E+01 0.00E+00 4.81E+01 Co-60 <2.21E+01 0.00E+00 2.21E+01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 79 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 371614 Sample Dates: 3/2/2015 - 3/2/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Zn-65 <6.72E+01 0.00E+00 6.72E+01 Zr-95 <2.91E+01 0.00E+00 2.91E+01 Nb-95 <1.78E+01 0.00E+00 1.78E+01 I-131 <2.59E+01 0.00E+00 2.59E+01 Cs-134 <2.36E+01 0.00E+00 2.36E+01 Cs-137 <2.37E+01 0.00E+00 2.37E+01 BaLa-140 <2.96E+01 0.00E+00 2.96E+01 Be-7 1.97E+03 3.52E+02 2.75E+02 K-40 3.81E+03 6.66E+02 3.40E+02 Sample ID: 375007 Sample Dates: 4/6/2015 - 4/6/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.26E+01 0.00E+00 2.26E+01 Co-58 <1.80E+01 0.00E+00 1.80E+01 Fe-59 <3.87E+01 0.00E+00 3.87E+01 Co-60 <2.48E+01 0.00E+00 2.48E+01 Zn-65 <4.31E+01 0.00E+00 4.31E+01 Zr-95 <4.17E+01 0.00E+00 4.17E+01 Nb-95 <2.02E+01 0.00E+00 2.02E+01 I-131 <1.85E+01 0.00E+00 1.85E+01 Cs-134 <3.03E+01 0.00E+00 3.03E+01 Cs-137 <2.34E+01 0.00E+00 2.34E+01 BaLa-140 <6.33E+00 0.00E+00 6.33E+00 Be-7 2.92E+03 4.27E+02 3.04E+02 K-40 4.90E+03 7.49E+02 4.34E+02 Sample ID: 378128 Sample Dates: 5/4/2015 - 5/4/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <1.49E+01 0.00E+00 1.49E+01 Co-58 <1.49E+01 0.00E+00 1.49E+01 Fe-59 <4.25E+01 0.00E+00 4.25E+01 Co-60 <2.02E+01 0.00E+00 2.02E+01 Zn-65 <4.48E+01 0.00E+00 4.48E+01 Zr-95 <3.58E+01 0.00E+00 3.58E+01 Nb-95 <1.65E+01 0.00E+00 1.65E+01 I-131 <1.71E+01 0.00E+00 1.71E+01 Cs-134 <2.14E+01 0.00E+00 2.14E+01 Cs-137 <1.44E+01 0.00E+00 1.44E+01 BaLa-140 <1.59E+01 0.00E+00 1.59E+01 Be-7 5.39E+02 1.67E+02 1.92E+02 K-40 3.63E+03 5.65E+02 1.83E+02 Sample ID: 380267 Sample Dates: 6/1/2015 - 6/1/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <1.97E+01 0.00E+00 1.97E+01 Co-58 <1.53E+01 0.00E+00 1.53E+01 Fe-59 <5.00E+01 0.00E+00 5.00E+01 Co-60 <2.58E+01 0.00E+00 2.58E+01 Zn-65 <3.59E+01 0.00E+00 3.59E+01 Zr-95 <2.65E+01 0.00E+00 2.65E+01 Nb-95 <2.12E+01 0.00E+00 2.12E+01 I-131 <1.81E+01 0.00E+00 1.81E+01 Cs-134 <1.87E+01 0.00E+00 1.87E+01 Cs-137 <1.72E+01 0.00E+00 1.72E+01 BaLa-140 <2.36E+01 0.00E+00 2.36E+01 Be-7 3.56E+02 1.61E+02 2.19E+02 K-40 3.12E+03 5.44E+02 2.71E+02 Sample ID: 382229 Sample Dates: 7/6/2015 - 7/6/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <1.96E+01 0.00E+00 1.96E+01 Co-58 <2.13E+01 0.00E+00 2.13E+01 Fe-59 <4.18E+01 0.00E+00 4.18E+01 Co-60 <2.54E+01 0.00E+00 2.54E+01 Zn-65 <6.49E+01 0.00E+00 6.49E+01 Zr-95 <4.13E+01 0.00E+00 4.13E+01 Nb-95 <1.97E+01 0.00E+00 1.97E+01 I-131 <2.20E+01 0.00E+00 2.20E+01 Cs-134 <2.61E+01 0.00E+00 2.61E+01 Cs-137 <2.09E+01 0.00E+00 2.09E+01 BaLa-140 <3.03E+01 0.00E+00 3.03E+01 Be-7 7.41E+02 2.00E+02 2.08E+02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 80 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 382229 Sample Dates: 7/6/2015 - 7/6/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA K-40 2.24E+03 5.16E+02 4.88E+02 Sample ID: 384722 Sample Dates: 8/3/2015 - 8/3/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <1.89E+01 0.00E+00 1.89E+01 Co-58 <2.01E+01 0.00E+00 2.01E+01 Fe-59 <2.83E+01 0.00E+00 2.83E+01 Co-60 <2.54E+01 0.00E+00 2.54E+01 Zn-65 <4.41E+01 0.00E+00 4.41E+01 Zr-95 <3.48E+01 0.00E+00 3.48E+01 Nb-95 <2.00E+01 0.00E+00 2.00E+01 I-131 <1.57E+01 0.00E+00 1.57E+01 Cs-134 <2.75E+01 0.00E+00 2.75E+01 Cs-137 <1.68E+01 0.00E+00 1.68E+01 BaLa-140 <1.82E+01 0.00E+00 1.82E+01 Be-7 4.59E+02 1.67E+02 2.15E+02 K-40 2.41E+03 4.60E+02 3.07E+02 Sample ID: 388827 Sample Dates: 9/8/2015 - 9/8/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.43E+01 0.00E+00 2.43E+01 Co-58 <3.05E+01 0.00E+00 3.05E+01 Fe-59 <5.48E+01 0.00E+00 5.48E+01 Co-60 <3.15E+01 0.00E+00 3.15E+01 Zn-65 <6.15E+01 0.00E+00 6.15E+01 Zr-95 <4.76E+01 0.00E+00 4.76E+01 Nb-95 <2.75E+01 0.00E+00 2.75E+01 I-131 <2.02E+01 0.00E+00 2.02E+01 Cs-134 <4.69E+01 0.00E+00 4.69E+01 Cs-137 <3.08E+01 0.00E+00 3.08E+01 BaLa-140 <3.76E+01 0.00E+00 3.76E+01 Be-7 1.09E+03 2.70E+02 2.73E+02 K-40 2.99E+03 5.88E+02 2.93E+02 Sample ID: 392017 Sample Dates: 10/5/2015 - 10/5/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.62E+01 0.00E+00 2.62E+01 Co-58 <1.68E+01 0.00E+00 1.68E+01 Fe-59 <3.38E+01 0.00E+00 3.38E+01 Co-60 <2.13E+01 0.00E+00 2.13E+01 Zn-65 <5.52E+01 0.00E+00 5.52E+01 Zr-95 <3.77E+01 0.00E+00 3.77E+01 Nb-95 <1.98E+01 0.00E+00 1.98E+01 I-131 <2.18E+01 0.00E+00 2.18E+01 Cs-134 <3.24E+01 0.00E+00 3.24E+01 Cs-137 <2.29E+01 0.00E+00 2.29E+01 BaLa-140 <6.17E+00 0.00E+00 6.17E+00 Be-7 1.99E+03 3.17E+02 2.18E+02 K-40 3.10E+03 5.26E+02 2.11E+02 Sample ID: 394910 Sample Dates: 11/2/2015 - 11/2/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.62E+01 0.00E+00 2.62E+01 Co-58 <2.35E+01 0.00E+00 2.35E+01 Fe-59 <3.74E+01 0.00E+00 3.74E+01 Co-60 <2.61E+01 0.00E+00 2.61E+01 Zn-65 <4.53E+01 0.00E+00 4.53E+01 Zr-95 <4.74E+01 0.00E+00 4.74E+01 Nb-95 <2.18E+01 0.00E+00 2.18E+01 I-131 <1.71E+01 0.00E+00 1.71E+01 Cs-134 <2.47E+01 0.00E+00 2.47E+01 Cs-137 <2.22E+01 0.00E+00 2.22E+01 BaLa-140 <1.74E+01 0.00E+00 1.74E+01 Be-7 2.58E+03 3.88E+02 2.48E+02 K-40 1.67E+03 3.99E+02 2.62E+02 Sample ID: 397246 Sample Dates: 12/7/2015 - 12/7/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.36E+01 0.00E+00 2.36E+01 Co-58 <2.27E+01 0.00E+00 2.27E+01 Fe-59 <3.45E+01 0.00E+00 3.45E+01 Co-60 <2.40E+01 0.00E+00 2.40E+01 Zn-65 <5.56E+01 0.00E+00 5.56E+01 Zr-95 <2.60E+01 0.00E+00 2.60E+01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 81 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 397246 Sample Dates: 12/7/2015 - 12/7/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Nb-95 <2.20E+01 0.00E+00 2.20E+01 I-131 <1.77E+01 0.00E+00 1.77E+01 Cs-134 <2.11E+01 0.00E+00 2.11E+01 Cs-137 <2.59E+01 0.00E+00 2.59E+01 BaLa-140 <1.81E+01 0.00E+00 1.81E+01 Be-7 4.15E+03 5.33E+02 2.74E+02 K-40 3.00E+03 5.52E+02 3.04E+02 Sample Point 079 [ INDICATOR - NE @ 0.56 miles ]

Sample ID: 365141 Sample Dates: 1/5/2015 - 1/5/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.31E+01 0.00E+00 3.31E+01 Co-58 <2.47E+01 0.00E+00 2.47E+01 Fe-59 <4.79E+01 0.00E+00 4.79E+01 Co-60 <4.27E+01 0.00E+00 4.27E+01 Zn-65 <8.08E+01 0.00E+00 8.08E+01 Zr-95 <5.70E+01 0.00E+00 5.70E+01 Nb-95 <3.71E+01 0.00E+00 3.71E+01 I-131 <3.62E+01 0.00E+00 3.62E+01 Cs-134 <3.58E+01 0.00E+00 3.58E+01 Cs-137 <3.53E+01 0.00E+00 3.53E+01 BaLa-140 <4.07E+01 0.00E+00 4.07E+01 Be-7 2.99E+03 4.92E+02 3.73E+02 K-40 3.57E+03 7.93E+02 7.57E+02 Sample ID: 367620 Sample Dates: 2/2/2015 - 2/2/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.27E+01 0.00E+00 3.27E+01 Co-58 <3.57E+01 0.00E+00 3.57E+01 Fe-59 <8.50E+01 0.00E+00 8.50E+01 Co-60 <3.61E+01 0.00E+00 3.61E+01 Zn-65 <7.85E+01 0.00E+00 7.85E+01 Zr-95 <5.01E+01 0.00E+00 5.01E+01 Nb-95 <3.61E+01 0.00E+00 3.61E+01 I-131 <3.29E+01 0.00E+00 3.29E+01 Cs-134 <4.36E+01 0.00E+00 4.36E+01 Cs-137 <3.89E+01 0.00E+00 3.89E+01 BaLa-140 <4.30E+01 0.00E+00 4.30E+01 Be-7 1.04E+03 3.35E+02 4.06E+02 K-40 2.81E+03 7.09E+02 6.27E+02 Sample ID: 371615 Sample Dates: 3/2/2015 - 3/2/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.23E+01 0.00E+00 2.23E+01 Co-58 <2.01E+01 0.00E+00 2.01E+01 Fe-59 <4.01E+01 0.00E+00 4.01E+01 Co-60 <2.10E+01 0.00E+00 2.10E+01 Zn-65 <5.11E+01 0.00E+00 5.11E+01 Zr-95 <3.48E+01 0.00E+00 3.48E+01 Nb-95 <2.36E+01 0.00E+00 2.36E+01 I-131 <2.34E+01 0.00E+00 2.34E+01 Cs-134 <3.21E+01 0.00E+00 3.21E+01 Cs-137 <2.61E+01 0.00E+00 2.61E+01 BaLa-140 <3.70E+01 0.00E+00 3.70E+01 Be-7 2.59E+03 3.96E+02 2.40E+02 K-40 3.27E+03 6.48E+02 5.57E+02 Sample ID: 375008 Sample Dates: 4/6/2015 - 4/6/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.19E+01 0.00E+00 2.19E+01 Co-58 <1.70E+01 0.00E+00 1.70E+01 Fe-59 <3.51E+01 0.00E+00 3.51E+01 Co-60 <1.60E+01 0.00E+00 1.60E+01 Zn-65 <3.12E+01 0.00E+00 3.12E+01 Zr-95 <2.95E+01 0.00E+00 2.95E+01 Nb-95 <2.12E+01 0.00E+00 2.12E+01 I-131 <1.47E+01 0.00E+00 1.47E+01 Cs-134 <2.24E+01 0.00E+00 2.24E+01 Cs-137 <1.58E+01 0.00E+00 1.58E+01 BaLa-140 <1.46E+01 0.00E+00 1.46E+01 Be-7 7.51E+02 1.87E+02 1.93E+02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 82 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 375008 Sample Dates: 4/6/2015 - 4/6/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA K-40 2.33E+03 4.34E+02 2.12E+02 Sample ID: 378129 Sample Dates: 5/4/2015 - 5/4/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.28E+01 0.00E+00 2.28E+01 Co-58 <2.29E+01 0.00E+00 2.29E+01 Fe-59 <2.80E+01 0.00E+00 2.80E+01 Co-60 <1.76E+01 0.00E+00 1.76E+01 Zn-65 <5.53E+01 0.00E+00 5.53E+01 Zr-95 <4.58E+01 0.00E+00 4.58E+01 Nb-95 <2.33E+01 0.00E+00 2.33E+01 I-131 <1.95E+01 0.00E+00 1.95E+01 Cs-134 <2.45E+01 0.00E+00 2.45E+01 Cs-137 <2.11E+01 0.00E+00 2.11E+01 BaLa-140 <2.47E+01 0.00E+00 2.47E+01 Be-7 6.44E+02 1.99E+02 2.25E+02 K-40 4.17E+03 6.71E+02 2.10E+02 Sample ID: 380268 Sample Dates: 6/1/2015 - 6/1/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.21E+01 0.00E+00 3.21E+01 Co-58 <2.64E+01 0.00E+00 2.64E+01 Fe-59 <4.31E+01 0.00E+00 4.31E+01 Co-60 <1.91E+01 0.00E+00 1.91E+01 Zn-65 <7.14E+01 0.00E+00 7.14E+01 Zr-95 <5.29E+01 0.00E+00 5.29E+01 Nb-95 <2.38E+01 0.00E+00 2.38E+01 I-131 <2.92E+01 0.00E+00 2.92E+01 Cs-134 <3.16E+01 0.00E+00 3.16E+01 Cs-137 <2.58E+01 0.00E+00 2.58E+01 BaLa-140 <9.00E+00 0.00E+00 9.00E+00 Be-7 <2.87E+02 0.00E+00 2.87E+02 K-40 3.90E+03 7.63E+02 5.14E+02 Sample ID: 382230 Sample Dates: 7/6/2015 - 7/6/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.09E+01 0.00E+00 2.09E+01 Co-58 <2.87E+01 0.00E+00 2.87E+01 Fe-59 <3.65E+01 0.00E+00 3.65E+01 Co-60 <3.05E+01 0.00E+00 3.05E+01 Zn-65 <6.63E+01 0.00E+00 6.63E+01 Zr-95 <4.96E+01 0.00E+00 4.96E+01 Nb-95 <2.76E+01 0.00E+00 2.76E+01 I-131 <2.67E+01 0.00E+00 2.67E+01 Cs-134 <3.40E+01 0.00E+00 3.40E+01 Cs-137 <3.05E+01 0.00E+00 3.05E+01 BaLa-140 <3.49E+01 0.00E+00 3.49E+01 Be-7 1.67E+03 3.62E+02 3.51E+02 K-40 2.30E+03 5.31E+02 2.45E+02 Sample ID: 384723 Sample Dates: 8/3/2015 - 8/3/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.43E+01 0.00E+00 2.43E+01 Co-58 <2.92E+01 0.00E+00 2.92E+01 Fe-59 <6.28E+01 0.00E+00 6.28E+01 Co-60 <3.80E+01 0.00E+00 3.80E+01 Zn-65 <7.83E+01 0.00E+00 7.83E+01 Zr-95 <4.78E+01 0.00E+00 4.78E+01 Nb-95 <2.32E+01 0.00E+00 2.32E+01 I-131 <3.00E+01 0.00E+00 3.00E+01 Cs-134 <4.44E+01 0.00E+00 4.44E+01 Cs-137 <3.14E+01 0.00E+00 3.14E+01 BaLa-140 <4.88E+01 0.00E+00 4.88E+01 Be-7 1.24E+03 3.20E+02 3.30E+02 K-40 4.09E+03 8.21E+02 6.52E+02 Sample ID: 388828 Sample Dates: 9/8/2015 - 9/8/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.66E+01 0.00E+00 2.66E+01 Co-58 <3.42E+01 0.00E+00 3.42E+01 Fe-59 <6.68E+01 0.00E+00 6.68E+01 Co-60 <3.66E+01 0.00E+00 3.66E+01 Zn-65 <5.91E+01 0.00E+00 5.91E+01 Zr-95 <5.30E+01 0.00E+00 5.30E+01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 83 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 388828 Sample Dates: 9/8/2015 - 9/8/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Nb-95 <3.51E+01 0.00E+00 3.51E+01 I-131 <2.87E+01 0.00E+00 2.87E+01 Cs-134 <3.75E+01 0.00E+00 3.75E+01 Cs-137 <3.23E+01 0.00E+00 3.23E+01 BaLa-140 <4.38E+01 0.00E+00 4.38E+01 Be-7 1.92E+03 3.95E+02 3.65E+02 K-40 2.99E+03 6.54E+02 4.58E+02 Sample ID: 392018 Sample Dates: 10/5/2015 - 10/5/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.18E+01 0.00E+00 3.18E+01 Co-58 <2.70E+01 0.00E+00 2.70E+01 Fe-59 <5.75E+01 0.00E+00 5.75E+01 Co-60 <2.97E+01 0.00E+00 2.97E+01 Zn-65 <7.67E+01 0.00E+00 7.67E+01 Zr-95 <5.53E+01 0.00E+00 5.53E+01 Nb-95 <2.64E+01 0.00E+00 2.64E+01 I-131 <3.05E+01 0.00E+00 3.05E+01 Cs-134 <3.72E+01 0.00E+00 3.72E+01 Cs-137 <3.93E+01 0.00E+00 3.93E+01 BaLa-140 <2.84E+01 0.00E+00 2.84E+01 Be-7 2.98E+03 4.91E+02 3.17E+02 K-40 3.09E+03 6.83E+02 4.90E+02 Sample ID: 394911 Sample Dates: 11/2/2015 - 11/2/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.46E+01 0.00E+00 3.46E+01 Co-58 <3.55E+01 0.00E+00 3.55E+01 Fe-59 <6.21E+01 0.00E+00 6.21E+01 Co-60 <4.45E+01 0.00E+00 4.45E+01 Zn-65 <6.57E+01 0.00E+00 6.57E+01 Zr-95 <5.72E+01 0.00E+00 5.72E+01 Nb-95 <3.30E+01 0.00E+00 3.30E+01 I-131 <2.94E+01 0.00E+00 2.94E+01 Cs-134 <3.60E+01 0.00E+00 3.60E+01 Cs-137 <3.81E+01 0.00E+00 3.81E+01 BaLa-140 <4.81E+01 0.00E+00 4.81E+01 Be-7 1.61E+03 3.89E+02 4.28E+02 K-40 1.72E+03 4.50E+02 7.26E+01 Sample ID: 397247 Sample Dates: 12/7/2015 - 12/7/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <1.53E+01 0.00E+00 1.53E+01 Co-58 <2.21E+01 0.00E+00 2.21E+01 Fe-59 <4.11E+01 0.00E+00 4.11E+01 Co-60 <2.24E+01 0.00E+00 2.24E+01 Zn-65 <5.15E+01 0.00E+00 5.15E+01 Zr-95 <3.10E+01 0.00E+00 3.10E+01 Nb-95 <1.62E+01 0.00E+00 1.62E+01 I-131 <1.97E+01 0.00E+00 1.97E+01 Cs-134 <2.78E+01 0.00E+00 2.78E+01 Cs-137 <2.40E+01 0.00E+00 2.40E+01 BaLa-140 <2.30E+01 0.00E+00 2.30E+01 Be-7 3.91E+03 5.15E+02 2.82E+02 K-40 3.39E+03 5.86E+02 2.30E+02 Sample Point 081 [ CONTROL - SE @ 9.33 miles ]

Sample ID: 365142 Sample Dates: 1/5/2015 - 1/5/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.98E+01 0.00E+00 2.98E+01 Co-58 <3.21E+01 0.00E+00 3.21E+01 Fe-59 <6.78E+01 0.00E+00 6.78E+01 Co-60 <4.52E+01 0.00E+00 4.52E+01 Zn-65 <9.97E+01 0.00E+00 9.97E+01 Zr-95 <5.94E+01 0.00E+00 5.94E+01 Nb-95 <3.62E+01 0.00E+00 3.62E+01 I-131 <2.47E+01 0.00E+00 2.47E+01 Cs-134 <4.51E+01 0.00E+00 4.51E+01 Cs-137 <4.15E+01 0.00E+00 4.15E+01 BaLa-140 <9.03E+00 0.00E+00 9.03E+00 Be-7 1.14E+03 3.16E+02 3.63E+02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 84 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 365142 Sample Dates: 1/5/2015 - 1/5/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA K-40 3.41E+03 7.28E+02 6.13E+02 Sample ID: 367621 Sample Dates: 2/2/2015 - 2/2/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.14E+01 0.00E+00 3.14E+01 Co-58 <2.62E+01 0.00E+00 2.62E+01 Fe-59 <5.30E+01 0.00E+00 5.30E+01 Co-60 <3.65E+01 0.00E+00 3.65E+01 Zn-65 <5.54E+01 0.00E+00 5.54E+01 Zr-95 <4.99E+01 0.00E+00 4.99E+01 Nb-95 <2.65E+01 0.00E+00 2.65E+01 I-131 <2.83E+01 0.00E+00 2.83E+01 Cs-134 <2.46E+01 0.00E+00 2.46E+01 Cs-137 <3.45E+01 0.00E+00 3.45E+01 BaLa-140 <4.10E+01 0.00E+00 4.10E+01 Be-7 2.69E+02 2.45E+02 3.91E+02 K-40 4.19E+03 7.42E+02 3.03E+02 Sample ID: 371616 Sample Dates: 3/2/2015 - 3/2/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <1.86E+01 0.00E+00 1.86E+01 Co-58 <1.72E+01 0.00E+00 1.72E+01 Fe-59 <3.95E+01 0.00E+00 3.95E+01 Co-60 <1.41E+01 0.00E+00 1.41E+01 Zn-65 <4.39E+01 0.00E+00 4.39E+01 Zr-95 <3.61E+01 0.00E+00 3.61E+01 Nb-95 <1.92E+01 0.00E+00 1.92E+01 I-131 <2.26E+01 0.00E+00 2.26E+01 Cs-134 <3.14E+01 0.00E+00 3.14E+01 Cs-137 <2.48E+01 0.00E+00 2.48E+01 BaLa-140 <3.11E+01 0.00E+00 3.11E+01 Be-7 5.11E+02 1.88E+02 2.35E+02 K-40 3.17E+03 5.86E+02 3.38E+02 Sample ID: 375009 Sample Dates: 4/6/2015 - 4/6/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <1.67E+01 0.00E+00 1.67E+01 Co-58 <1.85E+01 0.00E+00 1.85E+01 Fe-59 <3.81E+01 0.00E+00 3.81E+01 Co-60 <2.28E+01 0.00E+00 2.28E+01 Zn-65 <3.70E+01 0.00E+00 3.70E+01 Zr-95 <2.31E+01 0.00E+00 2.31E+01 Nb-95 <1.30E+01 0.00E+00 1.30E+01 I-131 <1.83E+01 0.00E+00 1.83E+01 Cs-134 <2.27E+01 0.00E+00 2.27E+01 Cs-137 <1.80E+01 0.00E+00 1.80E+01 BaLa-140 <1.60E+01 0.00E+00 1.60E+01 Be-7 5.77E+02 1.64E+02 1.68E+02 K-40 3.84E+03 5.87E+02 4.40E+01 Sample ID: 378130 Sample Dates: 5/4/2015 - 5/4/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.50E+01 0.00E+00 2.50E+01 Co-58 <2.32E+01 0.00E+00 2.32E+01 Fe-59 <4.62E+01 0.00E+00 4.62E+01 Co-60 <2.33E+01 0.00E+00 2.33E+01 Zn-65 <4.44E+01 0.00E+00 4.44E+01 Zr-95 <3.85E+01 0.00E+00 3.85E+01 Nb-95 <1.71E+01 0.00E+00 1.71E+01 I-131 <2.23E+01 0.00E+00 2.23E+01 Cs-134 <2.99E+01 0.00E+00 2.99E+01 Cs-137 <2.66E+01 0.00E+00 2.66E+01 BaLa-140 <2.93E+01 0.00E+00 2.93E+01 Be-7 5.63E+02 2.00E+02 2.48E+02 K-40 3.13E+03 5.78E+02 3.05E+02 Sample ID: 380269 Sample Dates: 6/1/2015 - 6/1/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.06E+01 0.00E+00 2.06E+01 Co-58 <1.79E+01 0.00E+00 1.79E+01 Fe-59 <4.85E+01 0.00E+00 4.85E+01 Co-60 <2.35E+01 0.00E+00 2.35E+01 Zn-65 <5.04E+01 0.00E+00 5.04E+01 Zr-95 <2.56E+01 0.00E+00 2.56E+01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 85 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 380269 Sample Dates: 6/1/2015 - 6/1/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Nb-95 <1.72E+01 0.00E+00 1.72E+01 I-131 <1.86E+01 0.00E+00 1.86E+01 Cs-134 <1.85E+01 0.00E+00 1.85E+01 Cs-137 <2.22E+01 0.00E+00 2.22E+01 BaLa-140 <1.99E+01 0.00E+00 1.99E+01 Be-7 <2.18E+02 0.00E+00 2.18E+02 K-40 3.88E+03 6.00E+02 4.53E+01 Sample ID: 382231 Sample Dates: 7/6/2015 - 7/6/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.68E+01 0.00E+00 3.68E+01 Co-58 <2.71E+01 0.00E+00 2.71E+01 Fe-59 <6.20E+01 0.00E+00 6.20E+01 Co-60 <3.31E+01 0.00E+00 3.31E+01 Zn-65 <4.07E+01 0.00E+00 4.07E+01 Zr-95 <4.94E+01 0.00E+00 4.94E+01 Nb-95 <2.75E+01 0.00E+00 2.75E+01 I-131 <2.52E+01 0.00E+00 2.52E+01 Cs-134 <2.91E+01 0.00E+00 2.91E+01 Cs-137 <2.91E+01 0.00E+00 2.91E+01 BaLa-140 <3.92E+01 0.00E+00 3.92E+01 Be-7 9.36E+02 2.73E+02 3.02E+02 K-40 6.83E+03 1.09E+03 7.45E+02 Sample ID: 384724 Sample Dates: 8/3/2015 - 8/3/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.18E+01 0.00E+00 2.18E+01 Co-58 <1.92E+01 0.00E+00 1.92E+01 Fe-59 <4.93E+01 0.00E+00 4.93E+01 Co-60 <1.57E+01 0.00E+00 1.57E+01 Zn-65 <5.12E+01 0.00E+00 5.12E+01 Zr-95 <3.75E+01 0.00E+00 3.75E+01 Nb-95 <1.85E+01 0.00E+00 1.85E+01 I-131 <2.24E+01 0.00E+00 2.24E+01 Cs-134 <1.95E+01 0.00E+00 1.95E+01 Cs-137 <2.59E+01 0.00E+00 2.59E+01 BaLa-140 <1.61E+01 0.00E+00 1.61E+01 Be-7 1.31E+03 2.43E+02 1.65E+02 K-40 5.12E+03 7.42E+02 3.34E+02 Sample ID: 388829 Sample Dates: 9/8/2015 - 9/8/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <1.52E+01 0.00E+00 1.52E+01 Co-58 <1.92E+01 0.00E+00 1.92E+01 Fe-59 <5.29E+01 0.00E+00 5.29E+01 Co-60 <3.19E+01 0.00E+00 3.19E+01 Zn-65 <3.54E+01 0.00E+00 3.54E+01 Zr-95 <3.61E+01 0.00E+00 3.61E+01 Nb-95 <2.23E+01 0.00E+00 2.23E+01 I-131 <2.07E+01 0.00E+00 2.07E+01 Cs-134 <2.85E+01 0.00E+00 2.85E+01 Cs-137 <2.76E+01 0.00E+00 2.76E+01 BaLa-140 <5.91E+00 0.00E+00 5.91E+00 Be-7 1.31E+03 2.60E+02 2.33E+02 K-40 4.79E+03 7.16E+02 3.33E+02 Sample ID: 392019 Sample Dates: 10/5/2015 - 10/5/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <1.75E+01 0.00E+00 1.75E+01 Co-58 <2.44E+01 0.00E+00 2.44E+01 Fe-59 <4.05E+01 0.00E+00 4.05E+01 Co-60 <2.55E+01 0.00E+00 2.55E+01 Zn-65 <5.24E+01 0.00E+00 5.24E+01 Zr-95 <3.81E+01 0.00E+00 3.81E+01 Nb-95 <2.02E+01 0.00E+00 2.02E+01 I-131 <2.21E+01 0.00E+00 2.21E+01 Cs-134 <2.14E+01 0.00E+00 2.14E+01 Cs-137 <2.92E+01 0.00E+00 2.92E+01 BaLa-140 <3.58E+01 0.00E+00 3.58E+01 Be-7 1.48E+03 3.01E+02 2.56E+02 K-40 1.87E+03 4.99E+02 4.78E+02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 86 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

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

Sample ID: 394912 Sample Dates: 11/2/2015 - 11/2/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.34E+01 0.00E+00 2.34E+01 Co-58 <1.79E+01 0.00E+00 1.79E+01 Fe-59 <4.09E+01 0.00E+00 4.09E+01 Co-60 <2.11E+01 0.00E+00 2.11E+01 Zn-65 <5.10E+01 0.00E+00 5.10E+01 Zr-95 <2.91E+01 0.00E+00 2.91E+01 Nb-95 <2.08E+01 0.00E+00 2.08E+01 I-131 <1.58E+01 0.00E+00 1.58E+01 Cs-134 <3.21E+01 0.00E+00 3.21E+01 Cs-137 <2.27E+01 0.00E+00 2.27E+01 BaLa-140 <2.43E+01 0.00E+00 2.43E+01 Be-7 2.71E+03 3.99E+02 2.71E+02 K-40 3.48E+03 6.06E+02 3.73E+02 Sample ID: 397248 Sample Dates: 12/7/2015 - 12/7/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.27E+01 0.00E+00 2.27E+01 Co-58 <2.69E+01 0.00E+00 2.69E+01 Fe-59 <5.38E+01 0.00E+00 5.38E+01 Co-60 <2.48E+01 0.00E+00 2.48E+01 Zn-65 <5.23E+01 0.00E+00 5.23E+01 Zr-95 <3.92E+01 0.00E+00 3.92E+01 Nb-95 <2.69E+01 0.00E+00 2.69E+01 I-131 <1.98E+01 0.00E+00 1.98E+01 Cs-134 <3.11E+01 0.00E+00 3.11E+01 Cs-137 <2.62E+01 0.00E+00 2.62E+01 BaLa-140 <2.75E+01 0.00E+00 2.75E+01 Be-7 1.98E+03 3.44E+02 2.66E+02 K-40 4.04E+03 6.62E+02 3.15E+02 Sample Point 084 [ INDICATOR - NNE @ 2.58 miles ]

Sample ID: 365143 Sample Dates: 1/5/2015 - 1/5/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.90E+01 0.00E+00 2.90E+01 Co-58 <2.39E+01 0.00E+00 2.39E+01 Fe-59 <6.85E+01 0.00E+00 6.85E+01 Co-60 <3.88E+01 0.00E+00 3.88E+01 Zn-65 <6.08E+01 0.00E+00 6.08E+01 Zr-95 <3.62E+01 0.00E+00 3.62E+01 Nb-95 <2.80E+01 0.00E+00 2.80E+01 I-131 <3.01E+01 0.00E+00 3.01E+01 Cs-134 <2.53E+01 0.00E+00 2.53E+01 Cs-137 <3.30E+01 0.00E+00 3.30E+01 BaLa-140 <3.74E+01 0.00E+00 3.74E+01 Be-7 5.30E+03 7.02E+02 4.65E+02 K-40 2.66E+03 5.90E+02 4.35E+02 Sample ID: 367622 Sample Dates: 2/2/2015 - 2/2/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <5.17E+00 0.00E+00 5.17E+00 Co-58 <6.01E+00 0.00E+00 6.01E+00 Fe-59 <1.36E+01 0.00E+00 1.36E+01 Co-60 <4.61E+00 0.00E+00 4.61E+00 Zn-65 <1.19E+01 0.00E+00 1.19E+01 Zr-95 <1.13E+01 0.00E+00 1.13E+01 Nb-95 <9.81E+00 0.00E+00 9.81E+00 I-131 <4.79E+01 0.00E+00 4.79E+01 Cs-134 <6.06E+00 0.00E+00 6.06E+00 Cs-137 <5.30E+00 0.00E+00 5.30E+00 BaLa-140 <2.03E+01 0.00E+00 2.03E+01 Be-7 4.67E+03 4.30E+02 1.01E+02 K-40 2.94E+03 2.79E+02 7.80E+01 Sample ID: 371617 Sample Dates: 3/2/2015 - 3/2/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <1.89E+01 0.00E+00 1.89E+01 Co-58 <1.77E+01 0.00E+00 1.77E+01 Fe-59 <4.32E+01 0.00E+00 4.32E+01 Co-60 <1.71E+01 0.00E+00 1.71E+01 Zn-65 <4.51E+01 0.00E+00 4.51E+01 Zr-95 <4.10E+01 0.00E+00 4.10E+01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 87 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

Media Type: VEGETATION Concentration (Activity): pCi/kg wet Sample Point 084 [ INDICATOR - NNE @ 2.58 miles ]

Sample ID: 371617 Sample Dates: 3/2/2015 - 3/2/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Nb-95 <1.94E+01 0.00E+00 1.94E+01 I-131 <2.25E+01 0.00E+00 2.25E+01 Cs-134 <2.56E+01 0.00E+00 2.56E+01 Cs-137 <2.21E+01 0.00E+00 2.21E+01 BaLa-140 <2.68E+01 0.00E+00 2.68E+01 Be-7 3.34E+03 4.68E+02 2.67E+02 K-40 2.78E+03 5.42E+02 3.61E+02 Sample ID: 375010 Sample Dates: 4/6/2015 - 4/6/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <1.84E+01 0.00E+00 1.84E+01 Co-58 <1.33E+01 0.00E+00 1.33E+01 Fe-59 <4.41E+01 0.00E+00 4.41E+01 Co-60 <1.94E+01 0.00E+00 1.94E+01 Zn-65 <3.97E+01 0.00E+00 3.97E+01 Zr-95 <3.84E+01 0.00E+00 3.84E+01 Nb-95 <2.02E+01 0.00E+00 2.02E+01 I-131 <2.14E+01 0.00E+00 2.14E+01 Cs-134 <1.97E+01 0.00E+00 1.97E+01 Cs-137 <1.78E+01 0.00E+00 1.78E+01 BaLa-140 <2.59E+01 0.00E+00 2.59E+01 Be-7 3.39E+03 4.41E+02 2.17E+02 K-40 2.75E+03 5.06E+02 3.11E+02 Sample ID: 378131 Sample Dates: 5/4/2015 - 5/4/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <1.68E+01 0.00E+00 1.68E+01 Co-58 <1.81E+01 0.00E+00 1.81E+01 Fe-59 <4.19E+01 0.00E+00 4.19E+01 Co-60 <1.38E+01 0.00E+00 1.38E+01 Zn-65 <4.28E+01 0.00E+00 4.28E+01 Zr-95 <4.05E+01 0.00E+00 4.05E+01 Nb-95 <1.78E+01 0.00E+00 1.78E+01 I-131 <1.86E+01 0.00E+00 1.86E+01 Cs-134 <2.80E+01 0.00E+00 2.80E+01 Cs-137 <2.16E+01 0.00E+00 2.16E+01 BaLa-140 <1.93E+01 0.00E+00 1.93E+01 Be-7 4.72E+02 1.59E+02 1.72E+02 K-40 3.29E+03 5.83E+02 2.81E+02 Sample ID: 380270 Sample Dates: 6/1/2015 - 6/1/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.62E+01 0.00E+00 2.62E+01 Co-58 <2.10E+01 0.00E+00 2.10E+01 Fe-59 <3.65E+01 0.00E+00 3.65E+01 Co-60 <2.03E+01 0.00E+00 2.03E+01 Zn-65 <5.38E+01 0.00E+00 5.38E+01 Zr-95 <4.69E+01 0.00E+00 4.69E+01 Nb-95 <2.89E+01 0.00E+00 2.89E+01 I-131 <2.29E+01 0.00E+00 2.29E+01 Cs-134 <3.07E+01 0.00E+00 3.07E+01 Cs-137 <2.94E+01 0.00E+00 2.94E+01 BaLa-140 <2.06E+01 0.00E+00 2.06E+01 Be-7 8.58E+01 1.57E+02 2.66E+02 K-40 2.76E+03 5.59E+02 2.70E+02 Sample ID: 382232 Sample Dates: 7/6/2015 - 7/6/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.06E+01 0.00E+00 2.06E+01 Co-58 <2.04E+01 0.00E+00 2.04E+01 Fe-59 <4.06E+01 0.00E+00 4.06E+01 Co-60 <2.16E+01 0.00E+00 2.16E+01 Zn-65 <5.53E+01 0.00E+00 5.53E+01 Zr-95 <3.92E+01 0.00E+00 3.92E+01 Nb-95 <2.28E+01 0.00E+00 2.28E+01 I-131 <1.87E+01 0.00E+00 1.87E+01 Cs-134 <1.85E+01 0.00E+00 1.85E+01 Cs-137 <2.75E+01 0.00E+00 2.75E+01 BaLa-140 <2.78E+01 0.00E+00 2.78E+01 Be-7 4.34E+02 1.81E+02 2.34E+02 K-40 1.66E+03 4.42E+02 3.98E+02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 88 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

Media Type: VEGETATION Concentration (Activity): pCi/kg wet Sample Point 084 [ INDICATOR - NNE @ 2.58 miles ]

Sample ID: 384725 Sample Dates: 8/3/2015 - 8/3/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.34E+01 0.00E+00 3.34E+01 Co-58 <3.15E+01 0.00E+00 3.15E+01 Fe-59 <5.44E+01 0.00E+00 5.44E+01 Co-60 <2.72E+01 0.00E+00 2.72E+01 Zn-65 <6.67E+01 0.00E+00 6.67E+01 Zr-95 <6.69E+01 0.00E+00 6.69E+01 Nb-95 <3.33E+01 0.00E+00 3.33E+01 I-131 <3.01E+01 0.00E+00 3.01E+01 Cs-134 <4.38E+01 0.00E+00 4.38E+01 Cs-137 <3.65E+01 0.00E+00 3.65E+01 BaLa-140 <2.76E+01 0.00E+00 2.76E+01 Be-7 8.07E+02 3.02E+02 3.88E+02 K-40 2.10E+03 5.70E+02 4.38E+02 Sample ID: 388830 Sample Dates: 9/8/2015 - 9/8/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.93E+01 0.00E+00 2.93E+01 Co-58 <2.49E+01 0.00E+00 2.49E+01 Fe-59 <6.71E+01 0.00E+00 6.71E+01 Co-60 <4.29E+01 0.00E+00 4.29E+01 Zn-65 <7.47E+01 0.00E+00 7.47E+01 Zr-95 <6.76E+01 0.00E+00 6.76E+01 Nb-95 <2.84E+01 0.00E+00 2.84E+01 I-131 <3.02E+01 0.00E+00 3.02E+01 Cs-134 <3.56E+01 0.00E+00 3.56E+01 Cs-137 <3.19E+01 0.00E+00 3.19E+01 BaLa-140 <2.98E+01 0.00E+00 2.98E+01 Be-7 7.97E+02 2.98E+02 3.75E+02 K-40 2.93E+03 6.44E+02 8.26E+01 Sample ID: 392020 Sample Dates: 10/5/2015 - 10/5/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <3.72E+01 0.00E+00 3.72E+01 Co-58 <2.84E+01 0.00E+00 2.84E+01 Fe-59 <4.23E+01 0.00E+00 4.23E+01 Co-60 <2.97E+01 0.00E+00 2.97E+01 Zn-65 <5.67E+01 0.00E+00 5.67E+01 Zr-95 <4.44E+01 0.00E+00 4.44E+01 Nb-95 <2.51E+01 0.00E+00 2.51E+01 I-131 <2.57E+01 0.00E+00 2.57E+01 Cs-134 <3.17E+01 0.00E+00 3.17E+01 Cs-137 <2.60E+01 0.00E+00 2.60E+01 BaLa-140 <3.74E+01 0.00E+00 3.74E+01 Be-7 3.59E+03 5.23E+02 2.73E+02 K-40 2.35E+03 5.52E+02 3.71E+02 Sample ID: 394913 Sample Dates: 11/2/2015 - 11/2/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.16E+01 0.00E+00 2.16E+01 Co-58 <3.10E+01 0.00E+00 3.10E+01 Fe-59 <6.07E+01 0.00E+00 6.07E+01 Co-60 <3.93E+01 0.00E+00 3.93E+01 Zn-65 <5.46E+01 0.00E+00 5.46E+01 Zr-95 <4.63E+01 0.00E+00 4.63E+01 Nb-95 <2.57E+01 0.00E+00 2.57E+01 I-131 <2.69E+01 0.00E+00 2.69E+01 Cs-134 <3.51E+01 0.00E+00 3.51E+01 Cs-137 <3.40E+01 0.00E+00 3.40E+01 BaLa-140 <2.47E+01 0.00E+00 2.47E+01 Be-7 2.45E+03 6.81E+02 2.36E+02 K-40 1.64E+03 5.15E+02 5.24E+02 Sample ID: 397249 Sample Dates: 12/7/2015 - 12/7/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Mn-54 <2.22E+01 0.00E+00 2.22E+01 Co-58 <2.21E+01 0.00E+00 2.21E+01 Fe-59 <4.51E+01 0.00E+00 4.51E+01 Co-60 <2.88E+01 0.00E+00 2.88E+01 Zn-65 <5.01E+01 0.00E+00 5.01E+01 Zr-95 <4.03E+01 0.00E+00 4.03E+01 Nb-95 <2.15E+01 0.00E+00 2.15E+01 I-131 <2.38E+01 0.00E+00 2.38E+01 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 89 of 90 Duke Energy Annual Report - Appendix E 13339 Hagers Ferry Road Huntersville, North Carolina 28078

OCONEE Radiological Environmental Monitoring Analysis Report - 2015 (Appendix E)

Media Type: VEGETATION Concentration (Activity): pCi/kg wet Sample Point 084 [ INDICATOR - NNE @ 2.58 miles ]

Sample ID: 397249 Sample Dates: 12/7/2015 - 12/7/2015 MIXEDBLV Nuclide Activity 2 Sigma Error MDA Cs-134 <2.35E+01 0.00E+00 2.35E+01 Cs-137 <1.91E+01 0.00E+00 1.91E+01 BaLa-140 <2.56E+01 0.00E+00 2.56E+01 Be-7 6.27E+03 7.53E+02 2.93E+02 K-40 3.30E+03 6.22E+02 3.91E+02 Report Generated @ 4/28/2016 14:24:16 EnRad Laboratories Appendix E - Page 90 of 90 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 2015 AREOR Oconee AREOR: 2014 During a 2016 NOS audit, it was identified that some samples processed by the EnRad laboratory using the APEX gamma counting geometry 025LMAR310 did not have the required a priori lower limit of detection (LLD) calculated prior to performing the analysis.

An a posteriori LLD was calculated and all required lower limit of detections were satisfied (NCR # 02021801). The failure to calculate the a priori LLD prior to performing the analysis is an Analytical Deviation.

EnRad performed an extent of condition to assess which samples had been processed using the 025LMAR310 geometry. The APEX database was examined and Oconee indicator location 063 bottom feeder fish, Sample Manager ID # 359070, was determined to have been impacted (NCR # 02022545). Oconee indicator fish location 063 is located in the ESE sector at 0.80 miles (Lake Hartwell Hwy 183 Bridge). The impacted sample was assigned Sample Manager ID# 359070 for collection period 15OCT2014 - 22OCT2014. The APEX gamma analysis results and the a posteriori LLDs were reviewed and the analysis was determined valid.

The a posteriori LLD satisfied the requirements of Oconee Selected Licensee Commitments (SLC) 16.11 RADIOLOGICAL EFFLUENTS CONTROL, 16.11.6 Radiological Environmental Monitoring, Table 16.11.6-2 (Maximum Values for the Lower Limits of Detection (LLD)). While the a priori lower limits of detection (LLD) were not calculated prior to performing the analysis, all analytical results for this sample were valid. There were no collection discrepancies identified with this sample.

Appendix F - Page 2

ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT DUKE ENERGY CORPORATION OCONEE NUCLEAR STATION Units 1, 2, and 3 2015

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 Level 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 . . . . . . . 3-2 3.2 Drinking Water . . . . . . . . . . . . 3-5 3.3 Surface Water . . . . . . . . . . . . 3-7 3.4 Milk . . . . . . . . . . . . . . 3-10 3.5 Broadleaf Vegetation . . . . . . . . . . 3-12 3.6 Fish . . . . . . . . . . . . . . 3-14 3.7 Shoreline Sediment . . . . . . . . . . . 3-17 3.8 Direct Gamma Radiation . . . . . . . . . . 3-19 3.8.1 Environmental TLD . . . . . . . . . . 3-19 3.8.2 ISFSI . . . . . . . . . . . . 3-20 3.9 Land Use Census . . . . . . . . . . . 3-24 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 Duke Energy Interlaboratory Program . . . . . . 5-2 5.5.2 Eckert & Ziegler Analytics Cross Check Program . . . . 5-2 5.5.3 ERA Proficiency Testing . . . . . . . . . 5-4 5.6 Intercomparison Program . . . . . . . . . . 5-4 5.7 TLD Intercomparison Program . . . . . . . . . 5-4 5.7.1 Nuclear Technology Services Intercomparison Program . . . 5-4 5.7.2 Internal Cross Check (Duke Energy) . . . . . . . 5-4 5.8 General Engineering Laboratory (GEL) . . . . . . . 5-5 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 i

IV. Sampling and Analysis Procedures . . . . . . . . A-3 A.1 Airborne Particulate and Radioiodine . . . . . . A-3 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-2 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 . . . . . . 3-4 3.2 Concentration of Tritium in Drinking Water . . . . . . 3-5 3.3 Concentration of Tritium in Surface Water . . . . . . . 3-8 3.5 Concentration of Cs-137 in Broadleaf Vegetation . . . . . 3-12 3.6-1 Concentration of Cs-137 in Fish . . . . . . . . 3-15 3.6-2 Concentration of Cs-134 in Fish . . . . . . . . 3-15 3.7 Concentration of Cs-137 in Shoreline Sediment . . . . . . 3-17 3.8 Direct Gamma Radiation (TLD) Results . . . . . . . 3-20 3.9 Oconee Nuclear Station 2015 Land Use Census Map . . . . . 3-25 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 Lower Limits of Detection . . . . . 2-9 3.1-A Mean Concentration of Air Radioiodine (I-131) . . . . . . 3-3 3.1-B Mean Concentration of Gross Beta in Air Particulate . . . . . 3-4 3.2 Mean Concentrations of Radionuclides in Drinking Water . . . . 3-6 3.3 Mean Concentrations of Radionuclides in Surface Water . . . . 3-9 3.4 Mean Concentration of Radionuclides in Milk . . . . . . 3-11 3.5 Mean Concentration of Radionuclides in Vegetation . . . . . 3-13 ii

3.6 Mean Concentrations of Radionuclides in Fish . . . . . . 3-16 3.7 Mean Concentrations of Radionuclides in Shoreline Sediment . . . 3-18 3.8-A Direct Gamma Radiation (TLD) Results . . . . . . . 3-21 3.8-B Direct Gamma Radiation (TLD) Oconee 2015 Investigation Level . . 3-22 3.9 Oconee 2015 Land Use Census Results . . . . . . . 3-24 4.1-A Oconee Nuclear Station 2015 Environmental and Effluent Dose Comparison . 4-3 4.1-B Maximum Individual Dose for 2015 based on Environmental Measurements (mrem) for Oconee Nuclear Station . . . . . 4-5 5.0-A Duke Energy Interlaboratory Comparison Program . . . . . 5-6 5.0-B Eckert & Ziegler Analytics Cross Check Program . . . . . 5-10 5.0-C Environmental Resource Associates (ERA) Proficiency Testing . . . 5-13 5.0-D 2015 Environmental Dosimeter Cross-Check Results . . . . . 5-14 5.0-E 2015 Annual Quality Assurance Report for the Radiological Environmental Monitoring Program for GEL Laboratories, LLC. . . . . . 5-16 LIST OF ACRONYMS USED IN THIS TEXT (in alphabetical order)

BW BiWeekly C Control EPA Environmental Protection Agency ERA Environmental Resource Associates GEL General Engineering Laboratory GI-LLI Gastrointestinal - Lower Large Intestine GPS Global Positioning System ISFSI Independent Spent Fuel Storage Installation LLD Lower Limit of Detection M Monthly MDA Minimum Detectable Activity MOA Memorandum of Agreement mrem Millirem NIST National Institute of Standards and Technology NRC Nuclear Regulatory Commission ODCM Offsite Dose Calculation Manual ONS Oconee Nuclear Station pCi/kg picocurie per kilogram pCi/l picocurie per liter pCi/m3 picocurie per cubic meter Q Quarterly REMP Radiological Environmental Monitoring Program SA Semiannually SLCs Selected Licensee Commitments SM Semimonthly TECH SPECs Technical Specifications TLD Thermoluminescent Dosimeter PCi/ml microcurie per milliliter UFSAR Updated Final Safety Analysis Report 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 2015.

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. Nine-hundred ninety-three samples were analyzed comprising 1,058 test results in order to compile data for the 2015 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 2015 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 5.13E-02 mrem for 2015. 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 An environmental monitoring program 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),

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

Section 2 - Page 2

2.3.2 LOWER LEVEL OF DETECTION AND MINIMUM DETECTABLE ACTIVITY The Lower Level 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 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" LLD's 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 Chernobyl accident or the Fukushima accident). 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 Section 2 - Page 4

Figure 2.1-2 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 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

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)

MICROWAVE TOWER, SIX 020 IR SITE BOUNDARY 0.16 N 040 OR MILE 4.74 E 021 IR SITE BOUNDARY 0.25 NNE 041 OR JCT HWY 101 & 133 4.25 ESE LAWRENCE CHAPEL 022 IR SITE BOUNDARY 0.53 NE 042 OR CHURCH, HWY 133 4.93 SE HWY 291 AT 023 IR SITE BOUNDARY 0.93 ENE 043 OR ISSAQUEENA PARK 4.09 SSE HWY 130 AT LITTLE 024 IR SITE BOUNDARY 0.81 E 044 OR RIVER DAM 3.96 S TERMINUS OF HWY 588 025 IR SITE BOUNDARY 0.42 ESE 045 OR AT CROOKED CREEK 4.78 SSW HWY 188 AT 026 IR SITE BOUNDARY 0.34 SE 046 OR CROOKED CREEK 4.61 SW NEW HOPE CHURCH, 027 IR SITE BOUNDARY 0.49 SSE 047 OR HWY 188 3.58 WSW 028 IR SITE BOUNDARY 0.46 S 048 OR JCT HWY 175 & 188 3.64 W 029 IR SITE BOUNDARY 0.56 SSW 049 OR JCT HWY 201 & 92 3.60 WNW STAMP CREEK LANDING, 030 IR SITE BOUNDARY 0.42 SW 050 OR END OF HWY 92 3.53 NW HWY 128, 1 MILE N OF 031 IR SITE BOUNDARY 0.27 WSW 051 OR HWY 130 4.64 NNW DPC BRANCH OFFICE 076 IR SITE BOUNDARY 0.19 W 052 SI SITE - PICKENS 12.4 ENE DPC BRANCH OFFICE 032 IR SITE BOUNDARY 0.19 WNW 053 SI SITE - LIBERTY 11.7 E POST OFFICE - HWY 93 033 IR SITE BOUNDARY 0.21 WNW 054 SI NORRIS 8.60 ESE CLEMSON 034 IR SITE BOUNDARY 0.22 NW 055 SI METEOROLOGY PLOT 9.27 SSE WATER TOWER - SENECA 035 IR SITE BOUNDARY 0.17 NNW 056 SI 7.30 SSW OCONEE MEMORIAL 036 OR MILE CREEK LANDING 4.18 N 057 SI HOSPITAL 8.42 SW KEOWEE CHURCH, BRANCH RD 037 OR HWY 327 4.85 NNE 058 C SUBSTATION,WALHALLA 9.39 WSW CONVENIENCE MART, 038 OR JCT HWY 183 & 133 4.24 NE 059 SI TAMASSEE DAR SCHOOL 9.20 NW HWY 133, 1 MILE EAST CLEMSON 039 OR OF JCT HWY 183 & 133 4.02 ENE 081 C OPERATIONS CENTER 9.33 SE

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