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Home My WebLink AboutNC0001422_04_CAP Update 2020_Tables_20200814Corrective Action Plan Update August 2020 L.V. Sutton Energy Complex TABLES SynTerra TABLE 1-1 SUMMARY OF HISTORICAL ON -SITE ENVIRONMENTAL INCIDENTS CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Proximity Station Station DEQ Incident Occurrence Closure Release Status Latitude Longitude to Basins Notes Name Location Section Number Date Date Type (ft) Sutton Wilmington AST 14637 7/14/1995 Closed 1/11/2018 Petroleum 34.286158 -77.989235 1373 NA Sutton Wilmington AST 94367 12/5/2017 Closed 4/16/2020 Petroleum 34.284944 -77.985222 1537 Incident Name: Demolition Area Incident Name: Sutton Wilmington AST 94340 9/7/2016 Closed 1/10/2017 Petroleum 34.281011 -77.982336 3152 Plant Fuel Oil Release Incident Name: Sutton Wilmington AST 94190 2/5/2013 Closed 6/13/2013 Petroleum 34.282355 -77.980215 3015 Water Intake Area Notes• Onsite incident records provided by Duke Energy AST - Aboveground Storage Tank DEQ - Department of Environmental Quality ft - feet NA - Not Available Sutton - L.V. Sutton Energy Complex Prepared by: LWD Checked by: MAG Page 1 of 1 TABLE 2-1 SUMMARY OF ON -SITE FACILITIES CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Evaluated Rationale Facility as Source CSA Operational Source Area for Name Area in Schedule Status Material Evaluation CAP Retired Coal ash/NPDES 1971 Ash (ash has been permitted waste 57 CAMA- Basin Yes NA excavated; final streams acres regulated unit grading (source has complete) been removed) Retired Coal ash/NPDES 1984 Ash (ash has been permitted waste 80 CAMA- Basin Yes NA excavated; final streams acres regulated unit grading (source has complete) been removed) Retired Former (material has Process Fuel Downgradient Process Yes NA been (source has 0.75 of the CAMA - Area excavated; final been removed) acres regulated ash grading source areas. complete) Retired Former (ash has been Coal ash Downgradient Ash Yes NA excavated; final (source has 30 of the CAMA- Disposal grading acres regulated ash Area activities are been removed) source areas. ongoing) Retired (coal has been Coal Downgradient Former Yes NA removed; final (source has 14 of the CAMA- Coal Pile grading acres regulated ash activities are been removed) source areas. complete) Prepared by: WJW Checked by: PBW Notes: CSA Schedule - applicable only for units identified in the letter "Final Comprehensive Site Assessment and Corrective Action Plans Approvals for Duke Energy" (April 5, 2019) CAMA - North Carolina Coal Ash Management Act of 2014 CAP - Corrective Action Plan NA - not applicable NPDES - National Pollutant Discharge Elimination System Page 1 of 1 TABLE 3-1 BACKGROUND THRESHOLD VALUES FOR SOIL CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Constituent Reporting Unit PSRG Protection of Groundwater 2018 Background Threshold Values' 2020 Updated Background Threshold Values2 pH* S.U. NE 4.8 - 6.6 4.8 - 6.7 Aluminum mg/kg 110,000 3,846 328 Antimony mg/kg 0.9 0.6 0.8 Arsenic mg/kg 5.8 0.8 1.8 Barium mg/kg 580 5 5 Beryllium mg/kg 63 0.04 0.3 Boron mg/kg 45 3 3 Cadmium mg/kg 3 0.03 0.1 Calcium mg/kg 225^ 340 290 Chloride mg/kg 938^ 16 275 Chromium mg/kg 3.8 3.10 2.9 Cobalt mg/kg 0.9 0.9 1.2 Copper mg/kg 700 0.6 0.7 Iron mg/kg 150 2,750 2,533 Lead mg/kg 270 3 3 Magnesium mg/kg 18^ 290 290 Manganese mg/kg 65 5 13 Mercury mg/kg 1 0.1 0.1 Molybdenum mg/kg 7.1 2.7 2.4 Nickel mg/kg 130 3 2 Nitrate (as N) mg/kg 38^ 0.3 28 Potassium mg/kg 91^ 290 290 Selenium mg/kg 2.1 1.7 1.9 Sodium mg/kg 131^ 340 290 Strontium mg/kg 1500 1 1 Sulfate mg/kg 1,438^ 16 275 Thallium mg/kg 0.28 0.17 0.22 Vanadium mg/kg 350 8 11 Zinc mg/kg 1200 3 3 Prepared by: WJW Checked by: MAF Revised by: LWD Notes• 2018 background threshold values were approved by North Carolina Department of Environmental Quality (NCDEQ) on May 14, 2018. ' - Background threshold values were calculated using data from background unsaturated soil samples collected February 2015 to May 2015. Z Updated background threshold values were calculated using data from background unsaturated soil samples c ollected January 2015 to August 2017. The background threshold value updates retained extreme outlier concentrations in background unsaturated soil datasets (SynTerra, 2019). * Upper and lower threshold values calculated for parameter ^ PSRG Protection of Groundwater value was calculated mg/kg - milligrams per kilogram NE - not established PSRG - preliminary soil remediation goals PSRG Protection of Groundwater - NCDEQ IHSB Preliminary Soil Remediation Goals Table - December 2019 S.U. - Standard Unit Page 1 of 1 TABLE 3-2 BACKGROUND THRESHOLD VALUES FOR GROUNDWATER CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Constituent Reporting Unit 15A NCAC 02L Standard 2018 Background Threshold Values' 2020 Updated Background Threshold ValueS2 Upper Surficial Flow Zone Lower Surficial Flow Zone Upper Pee Dee Flow Zone Lower Pee Dee Flow Zone Upper Surficial Flow Zone Lower Surficial Flow Zone Upper Pee Dee Flow Zone Lower Pee Dee Flow Zone pH* S.U. 6.5-8.5 6.5-8.5 4.1-5.1 7.8-9.3 6.9-9.7 4.1-7.3 5.1-7.3 7.8-9.4 7.5-9.7 Alkalinity mg/L NE 5 68 707 656 20 165 424 635 Aluminum pg/L NE 1,058 171 518 542 709 186 302 2,520 Antimony pg/L 1* 1 1 1 1 1 1 1 1 Arsenic pg/L 10 1 3 3 3 2 14 2 2 Barium pg/L 700 45 100 19 70 48 83 21 56 Beryllium pg/L 4* 1 1 1 1 1 1 1 1 Bicarbonate mg/L NE 5 68 734 883 16 171 637 624 Boron pg/L 700 50 50 3,010 4,730 50 50 2,830 4,580 Cadmium pg/L 2 1 1 1 1 1 1 1 1 Calcium mg/L NE 0.9 18 23 42 8.12 68 18 32 Carbonate mg/L NE 5 5 5 279 10 10 47 206 Chloride mg/L 250 5 18 1,932 2,567 6 30 770 1,700 Chromium pg/L 10 1 1 1 1 1.06 5 1 30 Chromium (VI) pg/L 10 0.03 0.1 0.1 0.2 0.06 0.1 0.1 0.4 Cobalt pg/L 1* 0.9 3 1 1 3 7 1 1 Copper pg/L 1000 1 1 1 1 5 5 1 1 Fluoride mg/L 2 NE NE NE NE 0.2 0.5 2 4 Iron pg/L 300 468 9,540 305 1,230 6,270 28,300 276 1,412 Lead pg/L 15 1 1 1 1 1 5 1 1 Lithium pg/L NE NE NE NE NE 5 5 127 102 Magnesium mg/L NE 0.5 3 14 33 0.5 3 14 25 Manganese pg/L 50 43 470 118 94 113 744 93 75 Mercury pg/L 1 0.05 0.05 0.05 0.05 0.05 0.2 0.05 0.05 Methane pg/L NE 26 177 67A 10 52 462 10 1,670 Molybdenum pg/L NE 1 1 25 19 1 1 26 26 Nickel pg/L 100 1 1 1 1 5 5 2 2 Nitrate + Nitrite mg-N/L NE 0.1 0.1 0.09^ 0.01 0.4 0.09 0.1 0.01 Potassium mg/L NE 0.7 0.5 46 64 0.8 5 31 43 Selenium pg/L 20 1 1 1 1 1 1 1 1 Page 1 of 2 TABLE 3-2 BACKGROUND THRESHOLD VALUES FOR GROUNDWATER CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Constituent Reporting Unit 15A NCAC 02L Standard 2018 Background Threshold Valued 2020 Updated Background Threshold Values2 Upper Surficial Flow Zone Lower Surficial Flow Zone Upper Pee Dee Flow Zone Lower Pee Dee Flow Zone Upper Surficial Flow Zone Lower Surficial Flow Zone Upper Pee Dee Flow Zone Lower Pee Dee Flow Zone Sodium mg/L NE 3 13 1,584 1,270 3 13 606 1,290 Strontium Ng/L NE 8 45 232 1,003 71 167 339 622 Sulfate mg/L 250 16 19 277 171 15 22 180 260 Sulfide mg/L NE 0.1 0.1 0.2 0.6 0.1 0.1 0.4 2 TDS mg/L 500 25 110 2,442 3,400 64 880 1,700 3,400 Thallium pg/L 0.2* 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 TOC mg/L NE 1 6 5 15 5 5 4 10 Total Radium pCi/L 5^ 4 5 4 2 4 5 1 6 Total Uranium Ng/mL 0.03^ 0.0002 0.0002 0.002 0.005 0.0002 0.0002 0.002 0.007 Vanadium Ng/L 0.3* 0.3 1 2 0.7 2 2 2 2 Zinc Ng/L 1 1000 1 6 1 19 1 5 1 5 1 13 1 13 1 5 1 6 Notes: 0- indicates BTV was not approved in May 14, 2018 NCDEQ BTV approval letter Background threshold values (BTVs) have been rounded to similar levels of precision as 15A North Carolina Administrative Code (NCAC) 02L Standard or Interim Maximum Allowable Concentration (IMAC). * - IMAC of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013. ^ - Federal Maximum Contaminant Level ' - BTVs were calculated using data from background groundwater samples collected March 2015 to October 2017. z - Updated BTVs were calculated using data from background groundwater samples collected March 2010 to September 2019 pg/L - micrograms per liter pg/mL - micrograms per milliliter mg/L - milligrams per liter mg-CaCO3/L - milligrams calcium carbonate per liter mg-N/L - milligrams nitrogen per liter NE - not established pCi/L - picocuries per liter S.U. - Standard Unit TDS - total dissolved solids TOC - total organic carbon Prepared by: WJW Checked by:JYT Revised by: LWD Page 2 of 2 TABLE 3-3 BACKGROUND DATASET RANGES FOR SURFACE WATER CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Constituent Reporting Unit Comparison Criteria Background Range Constituents with 15A NCAC 02B (Class C, Sw)1 Standards pH S.U. 6.0-9.0 6.6 - 8.8 Dissolved Oxygen mg/L >_ 4 2.73 - 5.93 Temperature deg C <_ 32 18 - 30 Turbidity NTU <_ 50 8.7 - 24 Arsenic pg/L 10 0.69 - <1 Arsenic (Dissolved) pg/L acute: 340, chronic: 150 0.52 - <1 Barium pg/L 1000 22 - 35 Beryllium (Dissolved) pg/L acute: 65, chronic: 6.5 0.024 j - <1 Cadmium (Dissolved )2 pg/L acute: 0.82, chronic: 0.15 <0.08 - <1 Chloride mg/L 230 12.8 - 34.2 Chromium (III) (Dissolved )2, 3 pg/L acute: 183, chronic: 24 NA Chromium (VI) (Dissolved) pg/L acute: 16, chronic: 11 NA Copper (Dissolved )2 pg/L acute: 3.6, chronic: 2.7 0.88 - 2.7 Fluoride mg/L 1.8 0.055 j - <0.1 Lead (Dissolved )2 pg/L acute: 14, chronic: 0.54 0.1 - <1 Mercury pg/L chronic: 0.012 0.00387 - 0.00588 Nickel pg/L 25 0.89 - 1.7 Nickel (Dissolved )2 pg/L acute: 145, chronic: 16 0.69 - <1 Nitrate + Nitrite mg-N/L 10 0.372 - 0.58 Selenium pg/L chronic: 5 0.14 j - <1 Silver (Dissolved )2 pg/L acute: 0.3, chronic: 0.06 <0.5 Sulfate mg/L 250 14 - 19 Thallium pg/L 2 <0.1 - <0.2 Total Dissolved Solids mg/L 500 103 - 149 Total Hardness mg/L 100 20.3 - 27.1 Zinc Dissolved 2 pg/L acute: 36, chronic: 36 2.6 j - 86 Constituents with USEPA National Recommended Water Quality Criteria Alkalinity mg/L chronic: >20 20 - 26 Aluminum fag/L acute: 620, chronic: 300 278 - 684 Antimony pg/L 640 0.15 j - <1 Iron pg/L 1000 881 - 1390 Manganese pg/L 100 70.8 - 189 Constituents without 02B or USEPA Criteria Bicarbonate mg-CaCO3/L NE 20 - 26 Boron fag/L NE 26.2 j - <50 Cadmium pg/L NE 0.055 j - <1 Calcium mg/L NE 5.35 - 7.6 Carbonate Alkalinity mg-CaCO3/L NE <5 - <10 Chromium pg/L NE 0.66 - 1.1 Chromium (VI) pg/L NE <0.025 - 0.16 Cobalt pg/L NE 0.29 - <1 Page 1 of 2 TABLE 3-3 BACKGROUND DATASET RANGES FOR SURFACE WATER CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Constituent Reporting Unit Comparison Criteria Background Range Constituents without 02B or USEPA Criteria (Continued) Copper pg/L NE 1 - 2 Lead pg/L NE 0.57 - <1 Lithium pg/L NE NA Magnesium mg/L NE 1.68 - 2.31 Methane pg/L NE <10 - 11 Molybdenum pg/L NE 0.38 j - <1 Potassium mg/L NE 2.68 j - 4.47 Sodium mg/L NE 14.5 - 30.2 Strontium pg/L NE 33.3 - 44 Sulfide mg/L NE <0.1 Total Organic Carbon mg/L NE 15 - 17.6 Total Radium pCi/L NE NA Total Uranium pg/mL NE NA Vanadium pg/L NE 2.27 - 3.2 Zinc pg/L I NE 2.5 j - 117 Prepared by: LWD Checked by: EMY Notes: Background locations were approved by North Carolina Department of Environmental Quality (NCDEQ). All samples are subject to Class C water quality standards. 15A NCAC 02B .0101 Class C = Waters protected for uses such as secondary recreation, fishing, wildlife, fish consumption, aquatic life including propagation, survival and maintenance of biological integrity, and agriculture. Secondary recreation includes wading, boating, and other uses involving human body contact with water where such activities take place in an infrequent, unorganized, or incidental manner. Z Standard value dependent on hardness. Calculated hardness dependent metal standards represent most conservative value. Standards are calculated using 25 mg/L hardness, regardless if actual instream hardness values are greater than 25 mg/L. 3 Chromium speciation is not performed for trivalent chromium (Cr(III)). Trivalent values are derived by subtracting hexavalent chromium values from dissolved chromium values. Where a dissolved chromium value is less than the detection limit it is considered a whole number for purposes of deriving a trivalent chromium value. Acute - "Compliance with acute instream metals standards shall only be evaluated using an average of two or more samples collected with one hour." Reference 15A NCAC 02B .0211 Chronic - "Compliance with chronic instream metals standards shall only be evaluated using averages of a minimum of four samples taken on consecutive days, or as a 96-hour average" Reference 15A NCAC 02B .0211. mg/L - milligrams per liter pg/L - micrograms per liter ug/mL - micrograms per milliliter mg-CaCO3/1- - milligrams calcium carbonate per liter mg-N/L - milligram nitrogen per liter NA - not available NE - not established pCi/L - picocuries per liter S.U. - standard unit j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit. < - concentration not detected at or above the adjusted reporting limit. Page 2 of 2 TABLE 3-4 BACKGROUND DATASET RANGES FOR SEDIMENT CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Constituent Reporting Unit Background Range pH S.U. 5.5 - 6.5 Aluminum mg/kg 302 - 29,000 Antimony mg/kg <0.95 - <6.5 Arsenic mg/kg 1.5 - <6.5 Barium mg/kg 2.8 - 90 Beryllium mg/kg 0.076 - 0.8 Boron mg/kg 2.7 j - <5 Cadmium mg/kg 0.081 j - <0.78 Calcium mg/kg 44.3 - 1,300 Chloride mg/kg 6.9 j - <320 Chromium mg/kg 0.56 - 32 Chromium (III) mg/kg NE Cobalt mg/kg 4.9 - 17 Copper mg/kg 0.26 j - 16 Iron mg/kg 1,180 - 29,000 Lead mg/kg <6.5 - 24 Magnesium mg/kg <32.3 - 2,000 Manganese mg/kg 17.4 - 620 Mercury mg/kg <0.011 - 0.19 j Molybdenum mg/kg <0.65 - <3.8 Nickel mg/kg 0.66 - it Nitrate (as N) mg/kg <0.43 - <32 Nitrate mg/kg NE Potassium mg/kg <323 - 1,100 Selenium mg/kg <2.5 - <6.5 Silver mg/kg <0.95 - <1 Sodium mg/kg <64.7 - <470 Strontium mg/kg 0.46 j - 16 Sulfate mg/kg <21 - <320 Sulfide mg/kg <53.5 - <61.1 Thallium mg/kg 0.089 j - <6.5 Total Organic Carbon mg/kg 772 j - 64,000 Vanadium mg/kg <6.5 - 66 Zinc mg/kg 4.8 - 56 Prepared by: LWD Checked by: MAG Notes: Background locations were approved by North Carolina Department of Environmental Quality (NCDEQ). mg/kg - milligrams per kilogram NE - not established S.U. - standard unit < - concentration not detected at or above the adjusted reporting limit. j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit. Page 1 of 1 TABLE 4-1 FEBRUARY 2020 GROUNDWATER LEVEL ELEVATIONS CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Well Identification Quarter 1 2020 Screened Interval (Ft-BGS) Monitoring Zone Groundwater Elevation (Ft -NAND 88) 02/26/2020 and 02/27/2020 AW-01C 9.99 44 49 Lower Surficial AW-02C 7.55 37 42 Lower Surficial AW-02D 8.62 92 97 Upper Peedee AW-03B -- 22 27 Upper Surficial AW-03C 8.64 42 47 Lower Surficial AW-04B -- 22 27 Upper Surficial AW-04C 8.14 42 47 Lower Surficial AW-05C 8.46 40 45 Lower Surficial AW-05D 8.51 90 100 Upper Peedee AW-06RB -- 20 25 Upper Surficial AW-06RD 8.34 95 100 Upper Peedee AW-06RE 8.33 151 156 Lower Peedee AW-07RD 8.35 91 101 Upper Peedee AW-08B -- 20 25 Upper Surficial AW-08C 9.62 41 46 Lower Surficial AW-09B -- 19 24 Upper Surficial AW-09C 8.30 40 45 Lower Surficial AW-09D 8.23 95 100 Upper Peedee CCR-109B -- 15 25 Upper Surficial CCR-109C -- 35 45 Lower Surficial CCR-109D -- 91 101 Upper Peedee CCR-114B 8.91 15 25 Upper Surficial CCR-114C 8.99 34 44 Lower Surficial CCR-114D 8.79 89 99 Upper Peedee CCR-115B 9.31 14 24 Upper Surficial CCR-115C 9.28 30 40 Lower Surficial CCR-115D 9.30 87 97 Upper Peedee FPA-02B 8.57 15 25 Upper Surficial FPA-02C 8.77 40 50 Lower Surficial FPA-03B 8.52 16 26 Upper Surficial FPA-03C 8.24 41 51 Lower Surficial FPA-04B 8.46 12 22 Upper Surficial FPA-04C 8.67 36.5 46.5 Lower Surficial FPA-09B 8.41 22 32 Upper Surficial FPA-09C 8.45 47 57 Lower Surficial MW-05B 9.18 22 27 Upper Surficial MW-05C 9.12 39 44 Lower Surficial MW-05CD 10.35 70 75 Upper Peedee MW-05D 8.65 90 100 Upper Peedee MW-05RE 9.14 145 150 Lower Peedee MW-07A -- 12 17 Upper Surficial Page 1 of 3 TABLE 4-1 FEBRUARY 2020 GROUNDWATER LEVEL ELEVATIONS CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Well Identification Quarter 1 2020 Screened Interval (Ft-BGS) Monitoring Zone Groundwater Elevation (Ft -NAND 88) 02/26/2020 and 02/27/2020 MW-07B -- 22 27 Upper Surficial MW-07C 8.56 35 45 Lower Surficial MW-08B 9.41 14.5 24.5 Upper Surficial MW-08 9.48 45 50 Lower Surficial MW-08D 9.48 90 100 Upper Peedee MW-08E 9.16 145 150 Lower Peedee MW-11 9.53 46 51 Lower Surficial MW-12R 8.28 45 55 Lower Surficial MW-15R-B 7.29 14 24 Upper Surficial MW-15R-C 7.28 38 48 Lower Surficial MW-16 9.48 2 12 Upper Surficial MW-16D 9.37 42 47 Lower Surficial MW-19 8.60 45 50 Lower Surficial MW-20 6.85 4 14 Upper Surficial MW-20D 6.79 43 48 Lower Surficial MW-21C 8.64 41 46 Lower Surficial MW-22B 8.68 23 27 Upper Surficial MW-22C 8.71 40 45 Lower Surficial MW-23B 8.52 22 27 Upper Surficial MW-23C 8.54 40 45 Lower Surficial MW-23D 8.50 95 100 Upper Peedee MW-23E 8.57 142 152 Lower Peedee MW-24RB 8.90 20 25 Upper Surficial MW-24RC 8.55 40 45 Lower Surficial MW-27B 9.59 24 29 Upper Surficial MW-27C 9.40 41 46 Lower Surficial MW-28B 8.73 26 31 Upper Surficial MW-28C 8.74 41 46 Lower Surficial MW-31RC 8.35 45 55 Lower Surficial MW-32C 8.96 45 50 Lower Surficial MW-33C 8.80 40 45 Lower Surficial MW-36B 9.37 22 27 Upper Surficial MW-36C 9.38 40 45 Lower Surficial MW-37B 8.02 20 25 Upper Surficial MW-37C 8.00 37 42 Lower Surficial MW-37CD 8.22 70 75 Upper Peedee MW-37D 8.26 90 100 Upper Peedee MW-37E 8.01 145 150 Lower Peedee MW-38B 9.66 20 25 Upper Surficial MW-38C 9.60 40 45 Lower Surficial MW-38D 9.68 96 101 Upper Peedee Page 2 of 3 TABLE 4-1 FEBRUARY 2020 GROUNDWATER LEVEL ELEVATIONS CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Well Identification Quarter 1 2020 Screened Interval (Ft-BGS) Monitoring Zone Groundwater Elevation (Ft -NAND 88) 02/26/2020 and 02/27/2020 MW-39B 8.99 19 24 Upper Surficial MW-39C 8.31 40 45 Lower Surficial MW-39D 8.55 95 100 Upper Peedee MW-40B 9.34 17 22 Upper Surficial MW-40C 9.33 37 42 Lower Surficial MW-40D 9.37 85 90 Upper Peedee MW-41B 9.19 15 25 Upper Surficial MW-41C 9.17 35 45 Lower Surficial MW-41D 11.47 92 102 Upper Peedee MW-41E 8.87 145 150 Lower Peedee MW-42B -- 17.5 27.5 Upper Surficial MW-42C -- 42 52 Lower Surficial MW-42D -- 89 99 Lower Peedee MW-43B 4.50 8 18 Upper Surficial MW-43C 4.57 33 43 Lower Surficial MW-44B 4.43 15 25 Upper Surficial MW-44C 4.24 40 50 Lower Surficial MW-45B 5.49 9 19 Upper Surficial MW-45C 5.34 35 45 Lower Surficial MW-46B 6.13 9 19 Upper Surficial MW-46C 6.18 34 44 Lower Surficial MW-50B 5.76 8 18 Upper Surficial MW-50C 5.79 31 41 Lower Surficial SMW-01B 8.55 19 24 Upper Surficial SMW-01C 8.52 41 46 Lower Surficial SMW-02B -- 18 25 Upper Surficial SMW-02C 8.87 41 46 Lower Surficial SMW-03B -- 20 25 Upper Surficial SMW-03C 9.13 41 46 Lower Surficial SMW-04C 8.82 39 44 Lower Surficial SMW-05C 8.50 39 44 Lower Surficial SMW-06B 8.41 20 25 Upper Surficial SMW-06C 8.33 39 44 Lower Surficial SMW-06D 8.62 101 106 Upper Peedee Notes: -- - not measured and/or not available BGS - below ground surface Ft - feet NAVD 88 - North American Vertical Datum 1988 Prepared by: W]W Checked by: ]YT Revised by: LWD Checked by: MAG Page 3 of 3 TABLE 4-2 HORIZONTAL HYDRAULIC GRADIENTS AND FLOW VELOCITIES CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Upper Surficial Flow Zone Targeted Area of Remediation Monitoring Wells Upgradient Well Groundwater Level h, (ft)l Downgradient Well Groundwater Level hZ (ft)z K ft da 3 ( / Y) Ah (ft) Upgradient Well Eastin 9 Upgradient Well Northing 9 Downgradient Well Eastin 9 Downgradient Well Northing 9 Al ft ( ) 3 ne vs ft/da ( Y) vs (ft/Yr) Gradient Ah/AI ( ) 1984 Ash Basin MW-38B to MW-39B 9.66 8.99 60 0.67 2304436.71 202963.06 2303609.74 202605.27 901 0.3 0.15 54.28 7.44E-04 1984 Ash Basin CCR-115B to CCR-114B 9.31 8.91 60 0.40 2304832.59 202095.03 2304322.60 201861.76 561 0.3 0.14 52.07 7.13E-04 1971 Ash Basin/FPA FPA-2B to FPA-3B 8.57 8.52 60 0.05 2306622.62 197997.77 2306363.68 197613.40 463 0.3 0.02 7.88 1.08E-04 FADA/FCPA MW-16 to MW-20 9.48 6.85 60 2.63 2306753.30 196976.18 2305318.06 196258.05 1605 0.3 0.33 119.63 1.64E-03 Eastern Property Line MW-23B to MW-42B 8.52 8.27 60 0.25 2306901.58 198967.48 2307927.28 198612.59 1085 0.3 0.05 16.81 2.30E-04 Geometric Mean 0.09 33.90 4.64E-04 Average 0.14 50.13 6.87E-04 Lower Surficial Flow Zone Targeted Area of Remediation Monitoring Wells Upgradient Well Groundwater Level h, (ft)l Downgradient Well Groundwater Level hZ (ft)z K ft da 3 ( / y) Ah (ft) Upgradient Well Eastin g Upgradient Well Northing g Downgradient Well Eastin g Downgradient Well Northing g Al ft ( ) 3 ne vs (ft/day) vs (ft/yr) Gradient Ah/AI ( ) 1984 Ash Basin MW-38C to MW-39C 9.60 8.31 125 1.29 2304436.78 202955.78 2303603.73 202601.57 905 0.3 0.59 216.73 1.43E-03 1984 Ash Basin CCR-115C to CCR-114C 9.28 8.99 125 0.29 2304832.59 202095.03 2304322.60 201861.76 561 0.3 0.22 78.64 5.17E-04 1971 Ash Basin/FPA FPA-2C to FPA-3C 8.77 8.24 125 0.53 2306622.62 197997.77 2306363.68 197613.40 463 0.3 0.48 173.92 1.14E-03 FADA/FCPA MW-16D to MW-20D 9.37 6.79 125 2.58 1 2306758.20 196963.07 2305326.19 196257.01 1597 0.3 0.67 245.75 1.62E-03 Eastern Property Line MW-23C to MW-12R 8.54 8.28 125 0.26 2306901.58 198967.48 2309012.80 200222.29 2456 0.3 0.04 16.10 1.06E-04 Eastern Property Line MW-22C to MW-42C 8.33 8.28 125 0.05 2307023.80 198349.58 2307927.28 198612.59 941 0.3 0.02 8.08 5.31E-05 Eastern Property Line AW-3C to AW-2C 8.64 7.55 125 1.09 2306673.75 201584.90 2306445.87 202160.60 619 0.3 0.73 267.73 1.76E-03 Geometric Mean 0.23 82.21 5.41E-04 Average 0.39 143.85 9.46E-04 Notes: ' - Groundwater level corresponds to upgradient groundwater elevations collected February 26 and 27, 2020 Z Groundwater level corresponds to downgradient groundwater elevations collected February 26 and 27, 2020 3 Value taken from Updated Groundwater Flow and Transport Modeling Report For L.V. Sutton Energy Complex, Wilmington, NC -Appendix F ft - feet yr - year h - water level height in feet K - horizontal hydraulic conductivity I - horizontal distance between wells ne - effective porosity v. - horizontal seepage velocity Ah - difference in water level height between upgradient and downgradient locations Al - horizontal distance between upgradient and downgradient locations FPA - Former Process Area FADA - Former Ash Disposal Area FCPA - Former Coal Pile Area Prepared by: WJW Checked by: JYT Revised by: LWD Page 1 of 1 TABLE 4-3 VERTICAL HYDRAULIC GRADIENTS CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Well Identification Monitoring Zone Reference Cross -Section Water Elevation (Ft-NAVD 88) Quarter 1 2020 Vertical Gradient (unit -less) and Flow Direction Adjacent to Ash Basins MW-23C Lower Surficial A -A' 8.54 0.00 Neutral MW-23D Upper Peedee 8.50 North of 1984 Ash Basin CCR-114C Lower Surficial B-B' 8.99 0.00 Neutral CCR-114D Upper Peedee 8.79 CCR-115C Lower Surficial -- 9.28 0.00 Neutral CCR-115D Upper Peedee 9.30 MW-39C Lower Surficial -- 8.31 0.00 Neutral MW-39D Upper Peedee 8.55 MW-40C Lower Surficial B-B' 9.33 0.00 Neutral MW-40D Upper Peedee 9.37 West of 1971 & 1984 Ash Basins CCR-112B Upper Surficial -- 8.22 0.00 Neutral CCR-112C Lower Surficial 8.20 CCR-112C Lower Surficial -- 1 8.20 0.00 Neutral CCR-112D Upper Peedee 8.17 Southeast of the 1971 Ash Basin and FPA MW-22B Upper Surficial -- 10.92 0.00 Neutral MW-22C Lower Surficial 10.92 FPA-03B Upper Surficial B-B' 1 8.38 0.01 Downward FPA-03C Lower Surficial 8.08 Eastern Property Boundary AW-02C Lower Surficial -- 7.55 -0.02 Upward AW-02D Upper Peedee 8.62 AW-05C Lower Surficial -- 8.46 0.00 Neutral AW-05D Upper Peedee 8.51 AW-06RB Upper Surficial A -A' 8.84 0.02 Downward MW-12R Lower Surficial 8.28 MW-12R Lower Surficial A -A' 8.28 0.00 Neutral AW-06RD Upper Peedee 8.34 Page 1 of 2 TABLE 4-3 VERTICAL HYDRAULIC GRADIENTS CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Well Identification Monitoring Zone Reference Cross -Section Water Elevation (Ft-NAVD 88) Quarter 1 2020 Vertical Gradient (unit -less) and Flow Direction Former Ash Disposal Area and Former Coal Pile MW-16 Upper Surficial D-D' 9.48 0.00 Neutral MW-16D Lower Surficial 9.37 MW-44B Upper Surficial -- 4.43 0.01 Downward MW-44C Lower Surficial 4.24 Background Wells MW-05C Lower Surficial -- 9.12 0.01 Downward MW-05D Upper Peedee 8.65 MW-37C Lower Surficial -- 8.00 0.00 Neutral MW-37D Upper Peedee 8.26 Offsite Wells SMW-06C Lower Surficial A -A' 8.33 0.00 Neutral SMW-06D Upper Peedee 8.62 Notes: -- - well pair does not appear on cross sections Ft - feet NAVD 88 - North American Vertical Datum 1988 Water level measurements were collected on 02/26/2020 and 02/27/2020 Prepared by: LWD Checked by: MAG Kevlsed by: WJW Page 2 of 2 TABLE 4-4 WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter Alkalinity Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Fluoride Iron Lithium Magnesium Manganese Molybdenum pH Potassium Selenium Sodium Strontium Sulfate Total Dissolved Solids Vanadium Impacted by Coal Ash? Comments Reporting Units mg/L pg/L pg/L mg/L mg/L pg/L pg/L mg/L pg/L pg/L mg/L pg/L pg/L S.U. mg/L pg/L m /L g pg/L mg/L mg/L pg/L SSA NCAC 02L Standard NE 10 700 NE 250 10 1* 2 300 NE NE 50 NE 6.5-8.5 NE 20 NE NE 250 500 0.3* Background Threshold Values (Lower Sur 165 14 50 68 30 0.1 7 0.5 28300 S 3 744 1 5.1-7.3 5 1 13 167 22 880 2 Background Background Data Set Range (Lower Surficial)' 6.1 - 195 <1 - 14 18.664 j - <50 1.36 - 80.1 2.6 - 74 <0.025 - <0.3 D3 0.436 j - 12 0.0469 j - <0.1 9.169001 j - 30100 2.248 j - 6 0.584 - 2.9 16 - 972 0.1 j - 1.27 4.9 - 7.4 0.665 - 4.98 <1 1.88 - 14.1 10 - 171 0.82 - 74 <25 - 927 0.115 Sample ID Sample Collection Date Analytical Results 421-Well 3 (CFPUA) 07/11/2013 NA <0.5 66.5 NA 7.5 <0.05 <0.5 0.044 j 35.6 j NA NA 76.2 <0.5 NM NA <0.5 5.78 46.2 24 NA <0.5 No With the exception of one anomalous sulfate result in 2014, all COIs are below comparative criteria. 421-Well 3 (CFPUA) 08/21/2013 NA <1 73.4 NA 7.4 <0.025 <1 <0.05 29.8 NA NA 78.5 <1 NM NA <1 NA 40.1 23.8 NA <1 421-Well 3(CFPUA) 09/12/2013 NA <1 68 NA 6.3 <0.025 <1 <0.05 42 NA NA 74 <1 NM NA <1 NA 41 23.6 NA <1 421-Well 3 (DEP) 10/03/2013 NA <1 67 NA 7.3 NA NA NA 42 NA NA 81 NA 5.5 NA <1 NA NA 26 NA NA 421-Well 3(CFPUA) 10/17/2013 NA <1 69 NA 7.4 <0.025 <1 <0.05 <40 NA NA 79 <1 NM NA <1 NA 41 23.9 NA <1 421-Well 3(CFPUA) 11/14/2013 NA <1 71.7 NA 7.4 <0.025 <1 <0.05 47.2 NA NA 81.4 <1 NM NA <1 NA 42 24 NA <1 421-Well 3(CFPUA) 12/12/2013 NA <1 68 NA 8 <0.025 <1 0.06 <40 NA NA 81 <1 NM NA <1 NA 40 26.1 NA <1 421-Well 3 (CFPUA) 01/10/2014 NA <1 78.2 NA 7.8 <0.025 <1 <0.05 41.4 NA NA 81.4 <1 NM NA <1 NA 46.1 25.7 NA <1 421-Well 3(CFPUA) 02/13/2014 NA <1 81.5 NA <10 <0.025 <1 <0.1 623 NA NA 92.4 <1 NM NA <1 NA 45.6 340 NA <1 421-Well 3 (DEP) 03/04/2014 NA <1 79 NA 8 NA NA NA 26 NA NA 90 NA 5.8 NA <1 NA NA 28 76 NA 421-Well 3 (CFPUA) 03/04/2014 NA <1 74 NA 7.4 <0.025 <10 0.051 <40 NA NA 94.5 <10 NM NA <15 NA 50.7 24.7 NA <10 421-Well 3(CFPUA) 04/10/2014 NA <1 80 NA 7.2 NA <1 <0.05 <40 NA NA 84 <1 NM NA <1 NA 43 24.3 NA <1 421-Well 3(CFPUA) 05/15/2014 NA <1 67.3 NA 7.7 <0.025 <1 0.073 <40 NA NA 85 <1 NM NA <1 NA 42.5 25.8 NA <1 421-Well 3 (DEP) 06/03/2014 NA <1 79 NA 7.7 NA NA NA 41 NA NA 94 NA 5.6 NA <1 NA NA 27 80 NA 421-Well 3(CFPUA) 06/03/2014 NA <1 56 NA 7.6 <0.025 <1 0.056 <40 NA NA 87 <10 NM NA <1 NA 43 27.8 NA <1 421-Well 3(CFPUA) 07/10/2014 NA <1 70 NA 7.4 <0.025 <1 0.054 46 NA NA 82 <1 NM NA <1 NA 41 24.9 NA <1 421-Well 3 (CFPUA) 08/14/2014 NA <1 66.7 NA <10 <0.025 <1 <0.1 <40 NA NA 78.4 <1 NM NA <1 NA 43.9 25.4 NA <1 421-Well 3(CFPUA) 09/11/2014 NA <1 71.5 NA 7 <0.025 <1 0.05 <40 NA NA 75.5 <1 NM NA <1 NA 40.4 22.1 NA <1 421-Well 3 (DEP) 10/02/2014 NA <1 70 NA 7.3 NA NA NA 72 NA NA 85 NA 5.3 NA <1 NA NA 25 71 NA 421-Well 3 (CFPUA) 10/02/2014 NA <1 60 NA 7 <0.025 <1 <0.05 47 NA NA 77 <1 NM NA <1 NA 43 21.9 NA <1 421-Well 3 (CFPUA) 11/13/2014 NA <1 64.6 NA 6.9 <0.025 <1 0.054 <40 NA NA 76.2 <1 NM NA <1 NA 40.5 21.3 NA <1 421-Well 3(CFPUA) 12/11/2014 NA <1 66 NA 6.9 <0.025 <1 <0.05 <40 NA NA 75 <1 NM NA <1 NA 45 21.3 NA <1 421-Well 3(CFPUA) 01/12/2015 NA <1 59 NA 7.8 <0.025 <1 0.058 84 NA NA 60 <1 NM NA <1 NA 40 15.4 NA <1 421-Well 3(CFPUA) 02/12/2015 NA <1 72 NA 7.1 <0.03 <1 <0.05 <40 NA NA 78 <1 NM NA <1 NA 47 22.2 NA <1 421-Well 3 (DEP) 03/12/2015 NA <1 76 NA 7.3 NA NA NA 30 NA NA 85 NA 5.5 NA <1 NA NA 27 65 NA 421-Well 3(CFPUA) 03/12/2015 NA <1 70 NA 7.1 <0.025 <1 <0.05 <40 NA NA 77 <1 NM NA <1 NA 51 21.6 NA <1 421-Well 3(CFPUA) 04/09/2015 NA <1 69 NA 7 <0.025 <1 <0.05 55 NA NA 79 <1 NM NA <1 NA 46 21.8 NA <1 421-Well 3(CFPUA) 05/12/2015 NA <1 61 NA 7 <0.025 <1 <0.05 <40 NA NA 79 <1 NM NA <1 NA 47 21.1 NA <1 421-Well 3 (DEP) 06/02/2015 9 <1 73 13.2 7.2 NA <1 NA 37 NA 1.25 84 <1 5.7 1.28 <1 0.00563 NA 24 66 NA 421-Well 3(CFPUA) 06/02/2015 NA <1 59 NA 7.1 <0.025 <1 <0.05 <40 NA NA 79 <1 NM NA <1 NA 46 21.2 NA <1 421-Well 3(CFPUA) 07/09/2015 NA <1 78 NA 6.9 <0.025 <2 <0.05 <40 NA NA 78 <1 NM NA <1 NA 45 21.2 NA <2 421-Well 3(CFPUA) 08/17/2015 NA <1 57 NA 7.2 <0.025 <1 0.051 47 NA NA 77 <1 NM NA <1 NA 46 21 NA <1 421-Well 3(CFPUA) 09/03/2015 NA <1 57 NA 6.7 0.32 <1 <0.05 <40 NA NA 64 <1 NM NA <1 NA 39 19.6 NA <1 421-Well 3 (DEP) 10/13/2015 8.1 <1 72 13.4 7.4 NA <1 NA 66 NA 1.24 81 <1 5.4 1.33 <1 0.00552 49 26 76 0.366 421-Well 3(CFPUA) 10/13/2015 NA <1 64 NA 7.3 <0.025 <1 <0.05 71 NA NA 76 <1 NM NA <1 NA 48 21.4 NA <1 421-Well 3 (CFPUA) 11/12/2015 NA <1 63 NA 7.5 <0.03 <1 <0.05 62 NA NA 79 <1 NM NA <1 NA 49 21.6 NA <1 421-Well 3(CFPUA) 12/10/2015 NA <1 72 NA 7.4 <0.03 <1 <0.05 79 NA NA 80 <1 NM NA <1 NA 48 21.9 NA <1 421-Well 3(CFPUA) 01/14/201 NNA <1 <50 NA 7.2 <0.03 <1 <0.05 <40 NA NA 82 <1 NM NA <1 NA 25 21.7 NA <1 421-Well 3(CFPUA) 02/11/2016 NA <1 66 NA 7.2 <0.03 <1 <0.05 91 NA NA 89 <1 NM NA <1 NA 49 21.5 NA <1 Page 1 of 3 TABLE 4-4 WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter Alkalinity Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Fluoride Iron Lithium Magnesium Manganese Molybdenum pH Potassium Selenium Sodium Strontium Sulfate Total Dissolved Solids Vanadium Impacted by Coal Ash? Comments Reporting Units mg/L pg/L pg/L mg/L mg/L pg/L pg/L mg/L pg/L pg/L mg/L pg/L pg/L S.U. mg/L pg/L m /L g pg/L mg/L mg/L pg/L 15A NCAC 02L Standard NE 10 700 NE 250 10 1* 2 300 NE NE 50 NE 6.5-8.5 NE 20 NE NE 250 500 0.3* Background Threshold Values (Lower Surficia1)' 165 14 50 68 30 0.1 7 0.5 28300 5 3 744 1 5.1 - 7.3 5 1 13 167 22 880 2 Background Data Set Range (Lower Surficial )' 6.1 - 195 11 - 14 18.664 j - <50 1.36 - 80.1 2.6 - 74 <0.025 - <0.3 D3 0.436 j - 12 0.0469 j - <0.1 9.169001 j - 30100 2.248 j - 6 0.584 - 2.9 16 - 972 0.1 j - 1.27 4.9 - 7.4 0.665 - 4.98 <1 1.88 - 14.5 10 - 111 0.82 - 74 <25 - 927 0.115 j - 1.9 Sample ID Sample Collection Date Analytical Results 421-Well 4 (CFPUA) 07/11/2013 NA <0.5 49.4 j NA 7.5 <0.05 0.81 j 0.056 83.5 NA NA 59.3 <0.5 NM NA <0.5 5.21 41.9 18.3 NA <0.5 No All COls are below comparative criteria. 421-Well 4 (CFPUA) 08/21/2013 NA <1 59 NA 7.4 <0.025 <1 0.059 72.2 NA NA 56 <1 NM NA <1 NA 37.1 17.5 NA <1 421-Well 4 (CFPUA) 09/12/2013 NA <1 55 NA 6.6 <0.025 <1 <0.05 71 NA NA 56 <1 NM NA <1 NA 39 17.7 NA <1 421-Well 4 (DEP) 10/03/2013 NA <1 <50 NA 7.4 NA NA NA 66 NA NA 55 NA 5.4 NA <1 NA NA 22 NA NA 421-Well 4 (CFPUA) 10/17/2013 NA <1 53 NA 7.4 <0.025 <1 0.067 75 NA NA 57 <1 NM NA <1 NA 39 17.3 NA <1 421-Well 4 (CFPUA) 11/14/2013 NA <1 53.1 NA 7.3 <0.025 <1 0.071 88 NA NA 54.4 <1 NM NA <1 NA 36.4 17.1 NA <1 421-Well 4 (CFPUA) 12/12/2013 NA <1 <50 NA 8.1 <0.025 <1 0.077 80 NA NA 57 <1 NM NA <1 NA 37 18.8 NA <1 421-Well 4 (CFPUA) 01/10/2014 NA <1 62.1 NA 7.9 <0.025 <1 0.06 81.7 NA NA 58.6 <1 NM NA <1 NA 39.8 17.9 NA <1 421-Well 4 (CFPUA) 02/13/2014 NA <1 64.2 NA 9 <0.025 <1 <0.05 88.2 NA NA 65 <1 NM NA <1 NA 41.1 18.4 NA <1 421-Well 4 (DEP) 03/04/2014 NA <1 54 NA 8.1 NA NA NA 64 NA NA 60 NA 6.2 NA <1 NA NA 19 55 NA 421-Well 4 (CFPUA) 03/04/2014 NA <1 <50 NA 7.4 <0.025 <10 <0.05 63.2 NA NA 59.6 <10 NM NA <15 NA 40.9 16 NA <10 421-Well 4 (CFPUA) 04/10/2014 NA <1 52 NA 7.5 NA <1 0.055 76 NA NA 56 <1 NM NA <1 NA 38 16.2 NA <1 421-Well 4 (CFPUA) 05/15/2014 NA <1 <50 NA 8.3 <0.025 <1 0.077 68.1 NA NA 58.1 <1 NM NA <1 NA 38.4 17.7 NA <1 421-Well 4 (DEP) 06/03/2014 NA <1 55 NA 8.2 NA NA NA 64 NA NA 64 NA 5.7 NA <1 NA NA 19 58 NA 421-Well 4 (CFPUA) 06/03/2014 NA <1 <50 NA 8.1 <0.025 <1 0.065 53 NA NA 58 <10 NM NA <1 NA 38 18.6 NA <1 421-Well 4 (CFPUA) 07/10/2014 NA <1 <50 NA 10.2 <0.025 <1 0.79 61 NA NA 57 <1 NM NA <1 NA 37 17.1 NA <1 421-Well 4 (CFPUA) 08/14/2014 NA <1 77.5 NA 12 <0.025 <1 <0.1 83.6 NA NA 86.1 <1 NM NA <1 NA 54.5 22.3 NA <1 421-Well 4 (CFPUA) 09/11/2014 NA <1 50.7 NA 7.7 <0.025 <1 0.059 60.8 NA NA 54.5 <1 NM NA <1 NA 37 15.5 NA <1 421-Well 4 (DEP) 10/02/2014 NA <1 54 NA 8 NA NA NA 71 NA NA 59 NA 5.4 NA <1 NA NA 17 52 NA 421-Well 4 (CFPUA) 10/02/2014 NA <1 <50 NA 7.6 <0.025 <1 0.054 67 NA NA 54 <1 NM NA <1 NA 39 15.1 NA <1 421-Well 4 (CFPUA) 11/13/2014 NA <1 <50 NA 7.5 <0.025 <1 0.078 67 NA NA 52.9 <1 NM NA <1 NA 34.6 15 NA <1 421-Well 4 (CFPUA) 12/11/2014 NA <1 55 NA 7.9 <0.025 <1 0.054 55 NA NA 60 <1 NM NA <1 NA 42 15.7 NA <1 421-Well 4 (CFPUA) 01/12/2015 NA <1 75 NA 7 <0.025 <1 <0.05 <40 NA NA 81 <1 NM NA <1 NA 45 21 NA <1 421-Well 4 (CFPUA) 02/12/2015 NA <1 54 NA 7.7 1.3 <1 0.051 72 NA NA 56 <1 NM NA <1 NA 41 15.5 NA <1 421-Well 4 (DEP) 03/12/2015 NA <1 53 NA 7.8 NA NA NA 71 NA NA 56 NA 5.4 NA <1 NA NA 22 46 NA 421-Well 4 (CFPUA) 03/12/2015 NA <1 <50 NA 7.5 <0.025 <1 <0.05 62 NA NA 52 <1 NM NA <1 NA 38 14.8 NA <1 421-Well 4 (CFPUA) 04/09/2015 NA <1 <50 NA 7.6 <0.025 <1 0.054 62 NA NA 53 <1 NM NA <1 NA 36 15 NA <1 421-Well 4 (CFPUA) 05/12/2015 NA <1 <50 NA 8 <0.025 <1 <0.05 76 NA NA 57 <1 NM NA <1 NA 40 15.8 NA <1 421-Well 4 (DEP) 06/02/2015 NA <1 54 7.01 7.5 NA <1 NA 71 NA 1.03 57 <1 5.3 1.21 <1 0.005 NA 17 45 NA 421-Well 4 (CFPUA) 06/02/2015 NA <1 <50 NA 7.5 <0.025 <1 0.065 79 NA NA 55 <1 NM NA <1 NA 41 14.8 NA <1 421-Well 4 (CFPUA) 07/09/2015 NA <1 60 NA 7.3 <0.025 <1 0.06 62 NA NA 53 <1 NM NA <1 NA 38 15 NA <1 421-Well 4 (CFPUA) 08/17/2015 NA <1 <50 NA 7.3 0.036 <1 0.074 49 NA NA 51 <1 NM NA <1 NA 37 14.7 NA <1 421-Well 4 (CFPUA) 09/03/2015 NA <1 <50 NA 7.3 0.34 <1 0.056 52 NA NA 49 <1 NM NA <1 NA 36 14.6 NA <1 421-Well 4 (DEP) 10/13/2015 <5 <1 53 6.77 7.3 NA <1 NA 63 NA 0.995 56 <1 5.3 1.18 <1 0.00485 40 21 40 <0.3 421-Well 4 (CFPUA) 10/13/2015 NA <1 <50 NA 7.1 <0.025 <1 0.058 93 NA NA 50 <1 NM NA <1 NA 38 15 NA <1 421-Well 4 (CFPUA) 11/12/2015 NA <1 <50 NA 7 <0.03 <1 0.058 93 NA NA 52 <1 NM NA <1 NA 37 14.5 NA <1 421-Well 4 (CFPUA) 12/10/2015 NA <1 <50 NA 6.9 <0.03 <1 <0.05 90 NA NA 47 <1 NM NA <1 NA 55 14.1 NA <1 421-Well 4 (CFPUA) 01/14/2016 NA <1 83 NA 6.8 <0.03 <1 0.065 130 NA NA 49 <1 NM NA <1 NA 70 14.6 NA <1 421-Well 4 (CFPUA) 02/11/2016 NA <1 <50 NA 6.8 <0.03 <1 0.053 90 NA NA 49 <1 NM NA <1 NA 35 14.5 NA <1 S-01 New Well (Vendor) 02/04/2015 1.99 <5 24 4.28 8.02 <100 <1 NA 70 NA 1.04 23 <5 6.8 0.993 <5 4.49 25 10.1 37.5 <3 No All COls are below comparative criteria. S-01 New Well (Duke) 02/04/2015 NA <1 <50 3.89 7.6 NA <1 NA 70 NA 1.03 24 <1 NM 0.995 <1 4.7 27 11 35 <0.3 S-01 Old Well (Vendor) 02/04/2015 2.59 <5 15 3.72 4.87 <100 <1 NA 58 NA 0.602 25 <5 5.6 0.716 <5 2.9 16 9.67 32 3 No Samples were collected in 2015 when groundwater flowed radially from the source area. Well is east and upgradient of the Site under current conditions. Not within the current direction of groundwater flow from the source areas. Outside of the Site drainage system, along a hydrologic divide. S-01 Old Well (Duke) 02/04/2015 NA <1 <50 3.51 4.6 NA <1 NA 52 NA 0.628 27 <1 NM 0.694 <1 2.98 17 12 1 28 <0.3 S-02 Pumphouse (Vendor) 03/05/2015 4 <1 690 19.9 25 <20 2 NA 24 NA 3.14 295 <1 5.4 3.28 <10 18.3 1 365 69 159 <1 Yes Samples were collected in 2015 & 2017 when groundwater flowed radially from the source area. Well is east and upgradient of the Site under current conditions. Not within the current direction of groundwater flow from the source areas. S-02 Pumphouse (Duke) 03/05/2015 NA <1 607 20.9 24 NA 2.04 NA 28 NA 3.27 302 <1 NM 3.23 1.71 16.8 378 72 170 <0.3 S-02 Pumphouse 03/22/2017 30 <1 516 28.8 32 <0.025 2.46 NA 71 NA 3.93 339 <1 5.02 4.76 <1 22.2 384 99 235 <0.3 S-02 Well 1 & 2 (Vendor) 03/05/2015 36 <1 160 60.7 25 <20 2 NA 635 NA 5.46 278 <1 6.0 9.98 <10 24.1 287 160 326 <1 Yes Samples were collected in 2015 when groundwater flowed radially from the source area. Well is east and upgradient of the Site under current conditions. Not within the current direction of groundwater flow from the source areas. Outside of the Site drainage system, along a hydrologic divide. S-02 Well 1 & 2 (Duke) 03/05/2015 NA <1 166 62.1 25 NA 1.56 NA 529 NA 5.67 292 <1 NM 9.86 <1 23.2 254 160 350 <0.3 S-03 (Vendor) 03/02/2015 3 <1 600 21.4 20 <20 2 NA 189 NA 3.43 274 <10 6.4 4.11 <10 20.2 302 76 185 <1 Yes Samples were collected in 2015&2017 when groundwater flowed radially from the source areas. Well is east and upgradient of the Site under current conditions. Not within the current direction of groundwater flow from the source areas. S-03 (Duke) 03/02/2015 NA <1 562 22.2 28 NA 2.27 NA 182 NA 3.63 283 <1 NM 3.72 2.26 19.6 323 82 180 <0.3 S-03 03/21/2017 15 <1 58 3 22.1 31 0.05 1.9 NA 74 NA 3.59 239 <1 5.2 3.83 3.06 19.7 374 91 190 <0.3 Page 2 of 3 TABLE 4-4 WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter Alkalinity Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Fluoride Iron Lithium Magnesium Manganese Molybdenum pH Potassium Selenium Sodium Strontium Sulfate Total Dissolved Solids Vanadium Impacted by Coal Ash? Comments Reporting Units mg/L pg/L pg/L mg/L mg/L pg/L pg/L mg/L pg/L pg/L mg/L pg/L pg/L S.U. mg/L pg/L m /L g pg/L mg/L mg/L pg/L 15A NCAC 02L Standard NE 10 700 NE 250 10 1* 2 300 NE NE 50 NE 6.5-8.5 NE 20 NE NE 250 500 0.3* Background Threshold Values (Lower Surficial)' 165 14 50 68 30 0.1 7 0.5 28300 5 3 744 1 5.1-7.3 5 1 13 167 22 880 2 Background Data Set Range (Lower Surficial )' 6.1 - 195 11 - 14 18.664 j - <50 1.36 - 80.1 2.6 - 74 <0.025 - <0.3 D3 0.436 j - 12 0.0469 j - <0.1 9.169001 j - 30100 2.248 j - 6 1 0.584 - 2.9 16 - 972 0.1 j - 1.27 4.9 - 7.4 0.665 - 4.98 <1 1.88 - 14.1 10 - 171 0.82 - 74 <25 - 927 0.115 j - 1.9 Sample ID Sample Collection Date Analytical Results 5-04 (Vendor) 03/11/2015 18 <1 180 20 13 <20 <1 NA 318 NA 1.61 23 <1 5.6 2.35 <10 10.4 93 41 125 <1 No All COIs are below comparative criteria. S-04 (Duke) 03/11/2015 NA <1 190 19.9 13 NA <1 NA 254 NA 1.7 25 <1 NM 2.29 <1 9.88 100 43 89 <0.3 S-04 03/21/2017 10 <1 218 16 11 0.033 <1 NA 67 NA 1.42 49 <1 5.2 2.35 <1 8.67 106 44 102 0.414 S-06 (Vendor) 02/04/2015 <1 <5 12 2.63 2.95 <100 <1 NA <20 NA 0.628 28 <5 5.1 1.05 <5 1.78 20 8.91 25.5 <3 No All COIs are below comparative criteria. S-06 (Duke) 02/04/2015 NA <1 <50 2.43 2.8 NA <1 NA 16 NA 0.651 29 <1 NM 1.05 <1 1.86 20 14 <25 <0.3 S-06 03/21/2017 15 <1 61 9.93 6.4 0.037 <1 NA 53 NA 0.914 52 <1 5.1 1.25 <1 4.27 54 30 68 <0.3 S-07 (Vendor) 02/25/2015 9.95 <5 20.7 11.6 4.41 <100 <1 NA <20 NA 1.45 18.4 <5 5.6 1.4 <5 2.9 26.7 11.9 63 <0.3 No All COls are below comparative criteria. S-07 (Duke) 02/25/2015 NA <1 <50 11.1 4.3 NA <1 NA <10 NA 1.39 18 <1 NM 1.35 <1 2.98 26 12 61 <0.3 S-07 03/21/2017 40 <1 <50 15.4 2.7 0.041 <1 NA <10 NA 0.865 16 <1 5.7 0.909 <1 1.99 24 14 69 0.368 S-08 Well 1 (Vendor) 03/05/2015 7 2 20 4.17 <5 <20 3 NA 1940 NA <1 74 <1 5.9 <1 <1 2.82 16 <15 30 <1 No All COIs are below comparative criteria. S-08 Well 1 (Duke) 03/05/2015 NA 1.26 <50 4.39 4.2 NA 3.21 NA 2200 NA 0.5 80 <1 NM 0.514 <1 2.89 17 7 36 <0.3 S-08 Well 1 (Vendor) 05/27/2015 8.96 <5 17 3.84 3.39 1 <20 3 NA 1950 NA 0.443 68 <5 5.9 0.536 <5 2.13 1 14 5.84 20.7 <0.3 S-08 Well 1 Post Filter (Vendor) 05/27/2015 7.96 1 <5 19 3.73 3.31 <20 3 NA 2070 NA 0.435 68 <5 5.8 0.553 1 <5 2.09 14 5.33 1 24 <0.3 S-08 Well 1 03/22/2017 30 3.74 <50 5.98 12 3.4 6.97 NA 8850 NA 0.9 138 <1 5.5 0.814 <1 6.65 30 24 75 0.55 S-08 Well 2 (Vendor) 03/05/2015 1 <1 250 9.5 19 <20 4 NA 120 NA 2.19 142 <1 5.2 1.79 <1 11.8 133 33 85 <1 No Samples were collected in 2015&2017 when groundwater flowed radially from the source area. Well is east and upgradient of the Site under current conditions. Not within the current direction of groundwater flow from the source areas. Outside of the Site drainage system, separated by a hydrologic divide. S-08 Well 2 (Duke) 03/05/2015 NA <1 224 9.86 19 NA 3.59 NA 51 NA 2.38 148 <1 NM 1.94 <1 11.3 139 35 96 <0.3 S-08 Well 2 (Vendor) 05/27/2015 10.5 <5 210 10.1 18.2 <20 4 NA 94 NA 2.5 159 <5 5.3 2.13 <5 11.5 141 34.6 77.3 <0.3 S-08 Well 2 03/22/2017 10 <1 322 15.3 31 1 0.035 4.4 NA 68 NA 3.2 252 <1 5.4 2.34 <1 16 1 211 62 148 <0.3 S-1003 03/21/2017 15 <1 64 8.65 7.3 0.05 <1 NA 33 NA 1.08 80 <1 4.8 1.11 <1 4.51 53 39 70 <0.3 No All COIs with the exception of pH are below comparative criteria. pH less than reporting criteria alone is not evidence of CCR impacts. S-1004 03/21/2017 15 <1 <50 9.04 2.8 0.04 <1 NA <10 NA 0.865 35 <1 5.1 0.938 <1 2.2 23 26 54 0.398 No All COIs are below comparative criteria. S-1010 03/22/2017 15 <1 95 8.41 10 0.028 2.71 NA <10 NA 1.61 115 <1 5.3 3.53 <1 8.26 73 54 83 0.404 No All COIs are below comparative criteria. S-12 (Vendor) 03/18/2015 42.8 <5 34 26.4 5.29 <100 <1 NA 254 NA 1.8 66 <5 6.9 1.2 <5 3.08 70 28 104 <0.3 No All COIs are below comparative criteria. S-12 (Duke) 03/18/2015 NA <1 <50 27.3 5.5 NA <1 NA 272 NA 2.05 75 <1 NM 1.23 <1 3.12 70 29 94 <0.3 S-12 03/22/2017 20 <1 96 14.3 15 1 <1 NA 821 NA 1.18 41 <1 5.9 0.91 <1 7.53 51 24 80 0.866 S-17 (Vendor) 04/30/2015 0 <0.001 62 10.3 15.2 NA <0.001 NA 33 NA 1.34 69 <0.001 NM 1.41 <0.01 6.35 45 23 75 <0.005 No With the exception of pH, which is within the Site background data set range, all COIs are below comparative criteria. S-17 (Duke) 04/30/2015 NA <1 66 8.17 7.1 NA <1 NA 80 NA 1.22 65 <1 NM 1 1.19 <1 5.4 39 26 48 <0.3 S-17 03/21/2017 15 <1 69 13.4 7.4 0.042 <1 NA 24 NA 1.79 91 <1 5.04 1.06 <1 5.69 31 35 84 0.303 S-18 (Vendor) 05/19/2015 15.9 <5 26 12.7 4.05 <20 <1 NA 30 NA 0.724 18 <5 6.3 1.22 <5 3.03 29 16.1 59.5 1.2 No All COIs are below comparative criteria. S-18 (Duke) 05/19/2015 NA <1 <50 12.6 3.8 NA <1 NA <10 NA 0.717 19 <1 NM 1.2 <1 3.02 31 15 53 0.537 S-2000 11/5/2018 < 5.0 < 0.10 440 20 26.4 0.031 1.5 NA 387 NA 3.07 156 < 0.50 NM 3.31 2.7 18.3 1 303 68.8 156 < 0.30 Yes With the exception of strontium, all COIs are within an order of magnitude of comparative criteria and are likely attributable to natural conditions. Historical groundwater migration from the ash basins may have influenced COI concentrations when the ash basins were operational. 2/28/2019 < 5.0 < 0.10 611 24 33 < 0.025 2 NA 181 NA 4.19 286 < 0.50 5.5 4.23 2.4 24.5 479 93.6 208 < 0.30 5/30/2019 < 5.0 < 0.10 1 660 23.9 26.8 0.039 1.7 NA 145 NA 3.69 256 < 0.50 5.0 3.98 2.2 22.1 389 1 90.1 1 179 < 0.30 9/24/2019 < 5.0 < 0.10 673 24.2 26.4 < 0.025 1.7 NA 144 NA 3.88 254 < 0.50 5.5 4.03 2.1 21.8 392 85.5 182 < 0.30 S-2002 9/24/2019 27.8 0.17 202 45.5 16.9 < 0.025 2.9 NA < 50.0 NA 3.35 210 < 0.50 6.2 5.5 < 0.50 22.1 272 93.4 233 0.4 No All COIs are within an order of magnitude of comparative criteria and are likely attributable to natural conditions 5-2003 11/5/2018 < 5.0 < 0.10 94.9 8.54 7.3 < 0.025 3.8 NA 59.5 NA 1.54 144 < 0.50 NM 2.68 < 0.50 11.9 75.6 49.1 90 < 0.30 No With the exception of pH, which is within the Site background data set range, all COIs are below comparative criteria or within an order of magnitude and likely attributable to natural conditions. 2/28/2019 < 5.0 < 0.10 79.7 7.25 6 < 0.025 2.9 NA < 50.0 NA 1.35 122 < 0.50 5.0 3.9 < 0.50 8.47 65.4 37.5 85 0.3 5/30/2019 < 5.0 < 0.10 72.4 6.66 7.9 0.033 2.7 NA < 50.0 NA 1.19 112 < 0.50 5.5 3.25 < 0.50 7.46 63 35.6 66 < 0.30 9/25/2019 < 5.0 0.1 72.4 6.98 7.9 < 0.0253 NA < .90.0 NA 1.24 116 < 0.50 5.6 ___[_ 3.42 < 0.50 10.8 65.2 1 36.6 1 74 < 0.30 Prepared by: LWD Checked by: DCH Notes: Revised by: GTC Checked by: WJW - Background threshold values were calculated using data from background groundwater samples collected March 2010 to September 2019. Bold text - greatest comparative value O - bold highlighted concentration indicates value is greater than the 15A NCAC 02L .0202 Standard or the IMAC. (Effective date for 15A NCAC 02L .0202 Standard and IMAC is April 1, 2013) - bold highlighted concentration indicates value is greater than the background threshold value where there is no regulatory standard, or background threshold values are greater than regulatory standard. * - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013. < - concentration not detected at or above the adjusted reporting limit. All water supply wells are assumed to be screened within the Lower Surficial flow zone. CCR - Coal Combustion Residues NA - not available CFPUA - Cape Fear Public Utility Authority NCAC - North Carolina Administrative Code COI - Constituent of Interest NE - not established DEP - Duke Energy Progress NM - not measured j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit. S.U. - Standard Units mg/L - milligrams per liter pg/L - micrograms per liter Page 3 of 3 TABLE 4-5 HOUSE BILL 630 IMPLEMENTATION SUMMARY CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Property Owner Name Property Address Water Solution Required Under HB6301 Ezzell Trucking, Inc. 235 (233) Sutton Lake Road Wilmington NC 28402 Water Treatment System No Turner Coastal Properties, LLC 221 Sutton Lake Road Wilmington NC 28402 Water Treatment System (still awaiting approval from owner to install) No S T Wooten Corp (S1007) 230 Sutton Lake Road Wilmington NC 28402 Water Treatment System No Old North State Properties LLC 3813 US HWY 421 N Wilmington NC 28402 Water Treatment System No Wil Fergie LLC (S1012) 3881 US HWY 421 N Wilmington NC 28402 To be connected to municipal 2020 No Absolute Properties Of The Carolinas LLC 331 Metro Cir Wilmington NC 28402 Connected to municipal No Maola Milk & Ice Cream Co 307 Metro Cir Wilmington NC 28402 Connected to municipal No Between The Rivers LLC 212 Transcom Ct Wilmington NC 28402 Connected to municipal No NA 3535 Fredrickson Road Wilmington NC 28402 Private Supply Well (empty lot) No M2, LLC 3505 Fredrickson Road Wilmington NC 28402 Private Supply Well (opted out) No Hansen Stone Matthews 3506 Fredrickson Road Wilmington NC 28402 Private Supply Well (opted out) No NA 249 Sutton Lake Road Wilmington NC 28402 Existing Municipal Connection No Mastec North America Inc. 3857 US HWY 421 N Wilmington NC 28402 Private Supply Well (opted out) No NA 3515 US HWY 421 N Wilmington NC 28402 Existing Municipal Connection No Old Dominion 3327 Fredrickson Road Wilmington NC 28402 Existing Municipal Connection No NA 4113, 4301 US HWY 421 N Wilmington NC 287402 Existing Municipal Connection No Porterfield (owner) 218 Roymac Dr Wilmington NC 28402 Connected to municipal No Notes: 1 - Well Eligibility for Replacement Water Supply Per NCGS 130A-3 HB630 - House Bill 630 NA - not available Prepared by: W]W Checked by: GTE Page 1 of 1 TABLE 5-1 CONSTITUENTS OF INTEREST EVALUATION - SOURCE AREA 1 1971 ASH BASIN, 1984 ASH BASIN, FORMER PROCESS AREA CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Co 2018 UpdaCSA te) Groundwater Reporting 02L or Zone Statistically Unit C IMA Derived Background Valuel,2 riterion L.V. Sutton Energy Complex Flow Zone Back?tround R L.V. Sutton NC Coastal Maximum Energy Plain Regional Concentration Groundwater Exceeds Complex Background Near or Beyond nce ackground Data..t Compliance Ratio Data..t Range Range" Boundary7 Constituent Standards and Values - 02L Criterion Number of Wells Greater C. Than mparative Criteria Near or Beyond Boundary Groundwater Monitoring Wells With COI Concentration Greater Than Comparative Criteria 5,6 Present in Ash Pore Wat r Above Dowingradient of Comparative Exceeds Exceeds Site- Exceeds Source Area at Geochemical Criteria Flow Zone Specific Regiona I lity4 Conc:ntrations Mobi (mean of ash Background Background Background Gre ter than P fore water Value Range Range Criteria 2015 to June Lines of Evidence (LOE) - 02L Criterion Rationale for Selection of COls for Corrective Action Evaluation (constituents where no concentrations are greater than comparative criteria in all flow zones and/or multiple lines of evidence support that constituent occurrences are not related to the source area, no corrective action is warranted) Rationale for Exclusion - 02L Criterion Upper Surficial 1 2 <S - 2.11 206 20.6 7 CCR-108RB, CCR-10913, CCR-11013, CCR-11113, CCR-11213, CCR-113B Y Y Y Y Non -Conservative Yes; Concentrations depict a plume -like distribution likely related to the source areas Arsenic pg/L 10 <1 - 2.11 0.335j - 14 Y Lower Surricial 3 14 <S - 14 92 6.6 6 CCR-108RC, CCR-109C, CCR-110C, CCR-111C, CCR-123RC, FPA-09C Y Y Y Y Non -Conservative Yes; Concentrations depict a plume -like distribution likely related to the source areas Upper Surficial 50 $0 5.99 - 65 3,171 4.5 2 CCR-11013, CCR-11113 Y Y N Y Conservative Yes; Concentrations depict a plume -like distribution likely related to the source areas Boron pg/L 700 <50 - 65 17.168j - 4730 Y Lower Surricial 50 50 <50 1,968 2.8 g CCR-109C, CCR-110C, CCR-111C, CCR-112C, CCR-120C, CCR-12111C, CCR- 123RC, FPA-09C, SMW-01C Y Y N Y Conservative Yes; Concentrations depict a plume -like distribution likely related to the source areas Upper Surficial 5 6 1.6 - 8.8 125 0.5 0 Y Y N N Conservative No; No concentrations are greater than comparison criteria at or beyond compliance boundary Chloride mg/L 250 1.6 - 74 <0.1 - 1800 N Lower Surficial 18 30 2.6 - 74 150 0.6 0 Y Y N N Conservative No; No concentrations are greater than comparison criteria at or beyond compliance boundary Chromium (Hexavalent) pg/L 10 Upper Surficial 0.03 0.06 <0.025 - <0.12 <0.3 <0.025 - 24.6 0.09 0.01 0 N Y N N N Variable No; No concentrations are greater than comparison criteria at or beyond compliance boundary Lower Surricial 0.1 0.1 <0.025 - <0.3 0.46 0.05 0 Y Y N N Variable No; No concentrations are greater than comparison criteria at or beyond compliance boundary Upper Surficial NE 0.2 0.0506 j - <0.5 0.79 0.4 0 Y Y N N Conservative No; No concentrations are greater than comparison criteria at or beyond compliance boundary Fluoride mg/L 2 0.0506 j - <0.5 <0.1 - 3.4j N Lower Surficl.l NE 0.5 <0.1 0.65 0.3 0 Y Y N N Conservative No; No concentrations are greater than comparison criteria at or beyond compliance boundary Upper Surficial 468 6270 9.16 j - 6780 13,459 2.1 1 FM-09B Y N N Y Variable No; no discernable plume with one well slightly greater than comparison criteria Iron pg/L 300 <10 - 30100 3.536j - 41400 Y Lower Surricial 9540 28300 <10 - 30100 21,204 0.7 0 Y N N N Variable No; No concentrations are greater than comparison criteria at or beyond compliance boundary Manganese pg/L 50 Upper Surficial 43 113 3.378 j - 114 3.378 j - 972 2.961j - 1920 381 3.4 1 FPA-09B y Y N N Y Variable No, only one location with concentrations greater than comparison criteria. Location is at the 1971 waste boundary with recent concentrations less than comparison criteria. Lower Surricial 470 744 16 - 972 1,226 1.6 1 snw-o2C Y Y N Y Variable No, SMW-02C is located offsite beyond the hydraulic divide Upper Surficial 1 1 <S 18.7 0.9 0 Y Y Y N Non -Conservative No; No concentrations are greater than comparison criteria at or beyond compliance boundary Selenium pg/L 20 <1 0.334j - 1.84 N Lower Surficial 1 1 <1 39 2.0 3 CCR-114C, CCR-115C, MW-40c Y Y Y Y Non -Conservative Yes; Concentrations depict aplume-like distribution likely related to the source areas Sulfate mg/L 250 Upper Surficial 16 15 4.2 - 140 0.82 - 140 2.961j - 1920 270 1.1 1 CCR-1231113 N Y Y N Y Variable No; not present above standard in ash pore water; no discernable plume with concentration in one well slightly greater than comparison criteria Lower Surficial 19 22 0.82 - 74 200 0.8 0 Y Y N N Variable No; No concentrations are greater than comparison criteria at or beyond compliance boundary Total Upper Surficial 2$ 64 <0.1 643 1.3 2 CCR-11013, CCR-123RB Y N N Y Conservative No; no discernable plume with concentrations slightly greater than comparison criteria Dissolved mg/L 500 <0.1 - 927 <25 - 3500 Y Lower Surricial 110 880 <25 - 921 666 0.8 0 N N N N Conservative No; No Concentrations are greater than comparison criteria at or beyond compliance boundary Solids nstituents with IMAC Criterion Lines of Evidence (LOE) - IMAC Criterion Rationale for Exclusion - IMAC Criterion Upper Surficial 0.9 3 0.363 j - 3.97 1.7 0.6 0 Y N N N Variable No; No concentrations are greater than comparison criteria at or beyond compliance boundary Cobalt pg/L 1 <1 - 12 0.349j - 16.6 2.4 5 CCR-109C, CCR-110C, CCR-111C, CCR-120C, MW-23C N Y Y Y Y Variable No, all but one location with detected concentrations greater than comparison criteria are located at the waste boundary. Concentration beyond compliance boundary is only 1.5x greater than comparison criteria. Lower Surficial 3 7 <S - 12 16.9 Upper Surficial 0.3 2 0.16 j - 2.63 102 51.0 1 FPA-02B Y Y Y Y Non -Conservative No; no discernable plume with one well greater than comparison criteria Vanadium pg/L 0.3 <1 - 2.63 0.105j - 4.48 Y Lower Surficial 1 2 <S - 1.96 3.28 1.6 2 CCR-114C, MW-39C Y Y N Y Non -Conservative No; no discernable plume with Concentrations slightly greater than comparative criteria. Background Criterion Lines of Evidence (LOE) - Background Criterion Rationale for Exclusion - Background Criterion Alkalinity mg/L NE Upper Surficial $ 26 <5 - 23.5 <5 - 195 <5 - 1060 3$3 17.7 2$ BMW-03, BMW-04, CCR-107RB, CCR-108RB, CCR-109B, CCR-110B, CCR-111B, CCR-112B, CCR-113B, CCR-114B, CCR-117B, CCR-118B, CCR-119B, CCR-120B, CCR-121RB, CCR-122RB, CCR-123RB, CCR-124RB, DMW-03, FPA-03B, FPA- 09B, MW-23B, SMW-01B, SMW-0513, SMW-06B NA Y Y N Y NA NO; Water quality parameter with n0 regulatory standard, no discernable plume, anomalous offsite Concentrations, Wells near source area are contained Within boron plume Lower Surricial 68 165 6.1 - 195 180 1.1 1 CCR-10811C Y N N Y NA No, Water quality parameter with no regulatory standard, no discernable plume Calcium m /L 9 NE Upper Surficial 0.9 8.12 0.169 - 20.9 0.169 - 80.1 0.169 - 235 106 13.1 30 BMW-03, BMW-04, CCR-107RB, CCR-108RB, CCR-109B, CCR-110B, CCR-111B, CCR-112B, CCR-113B, CCR-114B, CCR-115B, CCR-116B, CCR-117B, CCR-118B, CCR-119B, CCR-120B, CCR-121RB, CCR-122RB, CCR-123RB, CCR-124RB, DMW 03, DMW-09, FPA-038, FPA-098, MW-23B, MW-36B, MW-40B, SMW_" ,SMW- ose, SMW-06B NA Y Y N Y Conservative No, Water quality parameter with no regulatory standard, no discernable plume, anomalous offsite concentrations, wells near source area are contained within boron plume p Lower Surficial 18 68 1.36 - 80.1 74.9 1.1 2 CCR-107RC, CCR-121RC Y N N Y Conservative No, Water quality parameter with no regulatory standard, no discernable plume Lithium pg/L NE Upper Surficial NE 5 2.006 j - <5 1.006 j - 6 1.682j - 863 111 22.2 14 CCR-107RB, CCR-108RB, CCR-11013, CCR-11113, CCR-11213, CCR-11313, CCR- MWB3,6CBCR-121RB, CCR-122RB, CCR-123RB, CCR-124RB, FPA-09B, MW-27B, NA Y Y N Y Conservative No, all detected Concentrations greater than comparison criteria are located at the waste boundary. No concentrations greater than comparison Criteria in wells beyond the compliance boundary. Lower SUrfiCld NE 5 2.248 j - 6 172 34.4 10 CCR-107RC, CCR-108RC, CCR-109C, CCR-113C, CCR-115C, CCR-119C, CCR- 122RC, CCR-12311C, CCR-124RC, FPA-09C Y Y N Y Conservative No, all detected concentrations greater than comparison criteria are located at the waste boundary. No concentrations greater than comparison criteria in wells beyond the compliance boundary. i TABLE 5-1 CONSTITUENTS OF INTEREST EVALUATION - SOURCE AREA 1 1971 ASH BASIN, 1984 ASH BASIN, FORMER PROCESS AREA CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Col (2018 CSA Update 0 Reporting j2L or iMA Unit Cr teriCon Number of L.V. Sutton Wells Greater Groundwater L.V. Sutton NC Coastal Maximum Zone Statist - Energl nergy P,. in Region ., Concentration Groundwat Than ically Complex CE "r Comparative Groundwater Monitoring Wells With COI Concentration erived ackg round Valuel,2 m . l.. Background Near or Beyond Exceeda� ce Crit 5,6 Zone Background Cataset Compliance Ratio' aria Near Greater Than Comparative Criteria Background Dataset Range Ranges Boundary7 or Beyond Boundary Presen in Ash t NJ Pore Wat r Ab Compo,e of xceed arative Exceeds Exceeds Site- Exceed t GeoChemical Criteria Flow Zone Specific Regiona B Mobility4 (meanofash Background Background ackground Greater thans pore water Value Range Range Criteria 2015 to June 2019) Rationale for Selection of COls for Corrective Action Evaluation (constituents where no concentrations are greater than comparative criteria in all flow zones and/or v multiple lines of a idence support that constituent occurrences are not related to the source area,_ no corrective action is warranted) Background Criterion (Continued) Lines of Evidence (LOE) - Background Criterion (Continued) Rationale for Exclusion - Background Criterion (Continued) BMW-03, BMW-04, CCR-107RB, CCR-108RB, CCR-109B, CCR-110B, CCR-111B, CCR-112B, CCR-113B, CCR-114B, CCR-115B, CCR-116B, CCR-117B, CCR-118B, NO, Water quality parameter With n0 regulatory standard, n0 discernable plume With anomalous offsite Concentrations, Wells near Upper Surricial 0.5 0.5 0.096 - 6.56 28 55.6 33 CCR-119B, CCR-120B, CCR-121RB, CCR-122RB, CCR-123RB, CCR-124RB, DMW Ol, DMW-02, DMW-03, FPA-02B, FPA-09B, MW-23B, MW-27B, MW-36B, MW- Y N Y Y Conservative source area are contained within boron plume Magnesium mg/L NE 0.096 - 972 0.068 - 26.2 39B, MW-40B, SM Wc, SMW-0513, SMW-06B NA CCR-10JRC, CCR-108RC, CCR-109C, CCR-110C, CCR-111C, CCR-112C, CCR- No, Water quality parameter with no regulatory standard, no discernable plume with anomalous offsite concentrations, wells near Lower Surricial 3 3 16 - 972 20.3 6.8 16 120C, CCR-121RC, CCR-122RC, CCR-123RC, CCR-124RC, CCR-203C, FPA-02C, FPA-03C, FPA-09C, MW-12R, SMW-01C Y N N Y Conservative source area are contained within boron plume p BMW-o4, CCR-107RB, CC.108RB, CCR-109B, CCR-110B, CCR-111B, CCR- Upper Surficial 1 1 0.091 j - <1 73 73 23 112B, CCR-113B, CCR-115B, CCR-116B, CCR-118B, CCR-120B, CCR-121RB, CCR-122RB, CCR-123RB, CCR-124RB, DMW-03, FPA-02B, FPA-03B, FPA-09B, y y Y Y Variable Yes; Concentrations de lCt a lume-like distribution like) related to the source areas p p Y MW-23B, MW-36B, M-OB CCR-lOJRC, CCR-lOBRC, CCR-109C, CCR-110C, CCR-111C, CCR-112C, CCR- Molybdenum pg/L NE <1 - 1.27 0.091j - 43.7 NA Lower Surficial 1 1 <1 - 1.27 214 214 27 113Q CCR-114C, CCR-116C, CCR-117C, CCR-118C, CCR-12111C, CCR-122RC, CCR-123RC, CCR-124RC, CCR-203C, FPA-02C, FPA-03C, FPA-04C, FM-09C, MW-1211, MW-19, MW-21C, MW-22C, MW-2411C, MW-QC y y Y Y Variable Yes; Concentrations depict a plume -like distribution likely related to the source areas BMW-0t, BMW-03, BMW-04, CCR-107RB, CC.108RB, CCR-110B, CCR-111B, CCR-112B, CCR-113B, CCR-114B, CCR-115B, CCR-116B, CCR-117B, CCR-118B, No, Water quality parameter with n0 regulatory standard, NO discernable plume With anomalous offsite Concentrations, Wells near Upper Surficial 0.7 0.8 0.388 j - 33.8 24.7 30.9 32 CCR-119B, CCR-121RB, CCR-122RB, CCR-123RB, CCR-124RB, 13MW-01, DMW- 02, DMW-03, DMW-04, FPA-03B, FPA-04B, FPA-09B, MW-2JB, MW-36B, MW- Y N N Y Conservative source area are contained within boron plume Potassium mg/L NE 0.388 j - 33.8 0.1 - 359 39B, SMW-0113, SMW-0513, SMW-06B NA r14.9 CCR-10JRC, CCR-108RC, CCR-109C, CCR-110C, CCR-111C, CCR-112C, CCR- No, Water quality parameter with no regulatory standard, No discernable plume with anomalous offsite Concentrations, wells near Lower SurtCial 0.5 5 0.665 - 4.98 3.0 16 115C, CCR-121RC, CCR-122RC, CCR-123RC, CCR-124RC, FPA-02C, FPA-03C, FPA-09C, MW-12R, MW-40C Y N N Y CODserV811Ve source area are contained within boron plume Upper Surficial 3 3 0.872 - 7.51 92.8 30.9 26 BMW-01, BMW-03, BMW-04, Cl CCR-108RB, CCR-11013, CCR-11113, CCR-112B, CCR-113B, CCR-114B, CCR-115B, CCR-116B, CCR-118B, CCR-119B, y y N Y Conservative No, Contained within boron and strontium plumes and no regulatory standard CCR-120B, CCR-121RB, CCR-122RB, CCR-123RB, CCR-124RB, DMW-03, DMW- Sodlum ni NE 0.872 - 14.5 0.872 - 1320 04, FPA-0313, FPA-0913, SMW-01B, SMW-0513, SMW-06B NA AW-04C, CCR-107RC, CCR 08RC, CCR-109C, CCR-110C, CCR-111C, CCR- Lower Surficial 13 13 1.88 - 14.5 130.0 10.0 18 115C, CCR-120C, CCR-121RC, CCR-122RC, CCR-123RC, CCR-124RC, FPA-02C, Y Y N Y Conservative No, Contained within boron and strontium plumes and no regulatory standard FPA-09C, MW-12R, MW-40C, SMW-01C, SMW-06C Upper Surticial 8 71 3.497 j - 85 3,260 45.9 6 CCR-110B, CCR-112B, CCR-114B, FPA-03B, FPA-09B, MW-23B Y Y Y Y Variable Yes; Concentrations depict aplume-like distribution likely related to the source areas Strontium pg/L NE 3.497 j - 171 3.497j - 827 NA Lower Surficial 45 167 10 - 171 1,530 9.2 12 Aw-04C, CCR-110C, CCR-112C, CCR-114C, FPA-02C, FPA-03C, FPA-04C, FPA- y Y Y Y Variable Yes; Concentrations depict a plume -like distribution likely related to the source areas 09C, MW-19, MW-22C, MW-40C, SMW-01C Prepared by: w1W Checked by: GTC & LWO b.t 0- Reference Cdterlon 0- Evidence supports Inclusion _-Evidence supports exclusion r - Constituent list r='the COI list Identified in the CSA Update (SynTerra, 2018) '- Updated Background Values Include Groundwater Data Coll-d Through 2018 (Daft SynTerra, March 2019). ° The following wells were used to talcula[e geomean ash pore water concentrations: ABMW-o15, ABMW-02S 4 - The exceedan[e bar, Is the ratio of the observed constituent concentration divlded by the reference Criterion ° -The following upper sudl[lal Flow zone wells were used to alcula[e geomean groundwater concentaoons near or beyond the compliance boundary: AW-08B, BMW-01, BMW-03, BMW-04, CCR-107RB, CCR-108RB, CCR-109B, CCR-110B, CCR-1118, CCR-112B, CCR-113B, CCR-114B, CCR-115B, CCR-116B, CCR-117B, CCR-118B, CCR-119B, CCR-120B, CCR-121RB, CCR-122RB, CCR-123RB, CCR-124RB, DMW-01, DMW-02, DMW-03, DMW-04, FPA-02B, FPA-03B, FPA-13, FPA-09B, MW-22B, MW-23B, MW-24RB, MW-27B, MW-36B, MW-38B, MW-39B, MW-40B, 5MW-o1B, 5MW-05B, SMW-06B ° The following lower sudlclal Flow xone wells were used to calculate geomean groundwater Concentrations near or beyond the ce e cpllanboundary-02 : AWC, AW-04C, AW-OB-09 C, AWC, CCR-107RC, CCR-108RC, CCR-109C, CCR-110C, CCR-111C, CCR-112C, CCR-113C, CCR-114C, CCR-115C, CCR-116C, CCR-117C, CCR-118C, CCR-119C, CCR-120C, CCR-121RC, CCR-122RC, CCR-123RC, CCR-124RC, CCR-202C, CCR-203C, CCR-204C, CCR-205C, CCR-208C, FPA-02C, FPA-03C, FPA-04C, FPA-D C, MW-o7C, MW-11, MW-12R, MW-19, MW-21C, MW-22C, MW-23C, MW-24RC, MW-2JC, MW-33C, MW-36C, MW-38C, MW-39C, MW-40C, SMW-01C, SMW-02C, SMW-03C, SMW-04C, SMW-05C, 5MW-OsC - Maximum -nitration refers to maximum LCL95 orC y. Refer to Table 5-4 forthe full dataset ° The coastal plain regional background dataset Is comprised of the background dataset for all Flow zones at H.F. Lee, Sutton, and Weatherspoon fedinles pg/L - micrograms per her COI - Constituent of interest CSA - Comprehensive She Assessment C V - central tendency value IMAC -interim maximum allowable Concentration Ukg - liters per kilogram LCL95 - 95% lower confidence limit mg/L- mllllgams per II - NA - not applicable NE_ not established laj� TABLE 5-2 SUMMARY OF INTERIM ACTIONS - SOURCE AREA 1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Groundwater and Surface I Groundwater and Surface Water Remedy Water Interim Actions Excavation of ash from the 1971 and 1984 ash basins was completed in July 2019. Following the excavation of unsaturated ash in the 1971 ash basin, the saturated ash in the 1971 ash basin was dredged. The saturated ash was transferred to the 1984 ash basin to separate ash from the liquid. The liquid (wastewater) was transferred to the 1971 Source Removal basin, where it remains. Coal combustion residuals from the ash basins were transferred to a lined landfill or structural fill. Excavation of fuel waste and CCR from the FPA was completed in April 2020. Material was removed and the area was regraded. A nine -well groundwater extraction system, screened in the surficial flow zones, was installed along the eastern property boundary. The system became operational in Interim Action Plan Accelerated August 2017. The system operates continuously at a total Remediation Groundwater average pump rate of 500 gallons per minute. During the Extraction System reporting period for the 2019 annual performance monitoring report (April 2019 through March 2020), the system removed 217,915,013 gallons of groundwater. Continued operation of the system is included in the remedial alternatives evaluated. Notes: CCR - Coal Combustion Residual FPA - Former Process Area Prepared by: LWD Checked by: EMY Page 1 of 1 TABLE 5-3A SUMMARY OF UNSATURATED SOIL ANALYTICAL RESULTS - SOURCE AREA 1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter pH Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Iron Magnesium Manganese Molybdenum Potassium Selenium Sodium Strontium Sulfate Vanadium Reporting Units S.U. mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg PSRG Protection of Groundwater NE 5.8 45 225A 938A 3.8 0.9 150 18.. 65 7.1 91A 2.1 131A 1500 1,438 350 2018 Approved Background Threshold Values 4.8 - 6.6 0.772 3.3 340 16 NE 0.89 2750 290 5.32 2.7 290 1.7 340 1.29 16 8.16 2020 Provisional Background Threshold Values 4.8-6.7 1.8 3 290 275 NE 1.2 2533 290 13 2.4 290 1.9 290 1 275 it Sample ID Depth Interval (FEET BGS) Sample Collection Date Analytical Results Background Soil Samples BGSB-01 (0.5-1.0) 0.5 - 1 08/23/2017 6.2 0.22 j <2.4 <240 <12 NA <0.73 38 <240 2 <1.9 <240 <1.3 M <240 <0.96 <12 1.6 B BGSB-01 (2.0-3.0) 2 - 3 08/23/2017 6.0 0.35 j <2.6 <260 <11 NA <0.75 1000 <260 1.2 <2.1 <260 <1.4 <260 0.39 j <11 2.3 B BGSB-01 (4.0-5.0) 4 - 5 08/23/2017 6.7 0.24 j <2.7 <270 <11 NA <0.5 780 <270 2.1 <2.2 <270 <0.92 <270 0.43 j <11 1.8 B BGSB-02 (0.5-1.0) 0.5 - 1 08/23/2017 5.3 0.12 j <2.9 <290 <16 NA <0.84 33 <290 0.42 j <2.3 <290 <1.6 <290 <1.2 <16 0.95 j,B BGSB-02 (2.0-3.0) 2 - 3 08/23/2017 5.2 0.17 j <2.4 <240 <14 NA <0.8 16 <240 0.4 j <1.9 <240 <1.5 <240 <0.95 <14 1.1 j,B BGSB-02 (4.0-5.0) 4 - 5 08/23/2017 5.4 0.074 j <2.4 <240 <11 NA <0.41 25 <240 0.82 <1.9 <240 <0.75 <240 <0.96 <11 0.65 j,B BGSB-03 (0.5-1.0) 0.5 - 1 08/23/2017 4.8 0.12 j <2.5 <250 <10 NA <0.48 16 <250 0.72 j <2 <250 <0.89 <250 <1 <10 0.89 B BGSB-03 (2.0-3.0) 2 - 3 08/23/2017 5.2 0.45 j <2.9 <290 <13 NA <0.66 1100 <290 1.4 <2.4 <290 <1.2 <290 0.48 j <13 3.9 B BGSB-04 (0.5-1.0) 0.5 -1 08/23/2017 5.1 0.5 <2.5 39 j 1.6 j NA 0.49 j 1800 73 j 3.5 <2 35 j <0.96 <250 0.79 j 20 5.3 B BGSB-04 (2.0-3.0) 2 - 3 08/23/2017 5.0 0.54 <2.4 <240 <10 NA 0.22 j 1900 110 j 4.7 <1.9 66 j <1.1 <240 1.2 <10 5 B BGSB-04 (4.0-5.0) 4 - 5 08/23/2017 5.1 0.36 j <2.1 <210 <13 NA 0.32 j 810 39 j 2.8 <1.7 <210 1 <1.4 <210 0.44 j <13 2.5 B BGSB-05 (0.5-1.0) 0.5 - 1 08/23/2017 5.2 0.44 j <2.5 <250 <10 NA <0.64 1400 <250 1.4 <2 <250 <1.2 <250 0.5 j <10 6.6 B BGSB-05 (2.0-3.0) 2 - 3 08/23/2017 5.1 0.55 j <3.4 <340 <14 NA <0.89 1600 70 j 2.8 <2.7 44 j <1.7 <340 0.74 j <14 4.6 B MW-37C (0-2) 0 - 2 02/04/2015 6.5 <1.1 <2.7 <26.9 <263 NA <1.1 57.9 <26.9 0.72 <0.54 <53.8 <1.1 <53.8 <0.54 <263 <1.1 MW-37C (4-6) 4-6 02/04/2015 5.3 <1.1 <2.8 <27.9 <275 NA <1.1 875 <27.9 3.9 <0.56 <55.7 <1.1 <55.7 <0.56 <275 <1.1 1971 Ash Basin Soil Samples - Southeast of 1971 Ash Basin - Closure Samples 71B-03 (0-0.5) 0 - 0.5 06/19/2019 7.2 0.4 j <2.7 120 j <11 <1.1 0.29 j 300 39 j 3.1 <2.2 49 j <1.4 <270 2.9 <11 3.1 71B-03 (2-2.5) 2 - 2.5 06/19/2019 7.1 <0.48 <2.4 65 j 2.7 j <1.2 <0.68 90 <240 1.3 <1.9 <240 <1.3 <240 1.6 12 1.1 j 71B-06 (0-0.5) 0 - 0.5 06/19/2019 6.9 0.83 <2.4 130 j <11 0.22 j 0.29 j 520 36 j 3.1 <1.9 48 j <1.2 <240 4.3 <11 3.3 71B-06 (2-2.5) 2- 2.5 06/19/2019 6.8 0.47 j <2.8 73 j 3 j 0.29 j <0.79 290 <280 0.81 j <2.3 <280 <1.5 <280 2.9 19 1.9 71B-08 (0-0.5) 0- 0.5 06/19/2019 4.9 0.33 j <2.2 <220 <10 0.21 j <0.61 190 <220 1.1 <1.8 41 j 0.53 j <220 1.3 12 0.93 j 71B-08 (2-2.5) 2 - 2.5 06/19/2019 5.7 0.29 j <3 59 j 3.4 j <1.3 <0.83 170 <300 0.9 <2.4 44 j <1.5 <300 2.9 66 4.1 1984 Ash Basin Soil Samples - Southeast of 1971 Ash Basin - Closure Samples 84B-002 (0-0.5) 0 - 0.5 06/07/2019 5.1 5.1 1.9 j 970 3.9 j 0.27 j 0.97 6800 480 18 1.1 j 480 0.87 j 41 j 20 110 25 84B-002 (2-2.5) 2 - 2.5 06/07/2019 6.0 1.3 <2.2 270 5.7 j <1.2 <0.61 860 71 j 3.2 0.52 j 68 j <1.1 <220 8.4 <12 1.6 84B-007 (0-0.5) 0 - 0.5 06/07/2019 4.3 3.8 2.4 j 500 4.6 j 0.26 j 0.95 5900 490 17 1.2 j 580 0.54 j 48 j 19 93 26 84B-007 (2-2.5) 2 - 2.5 06/07/2019 5.5 0.45 j <2.7 <270 3.7 j <1.2 <0.75 580 <270 1 <2.1 <270 <1.4 <270 0.78 j 20 1.1 j 84B-011 (0-0.5) 0 - 0.5 06/07/2019 4.8 1.4 2.6 j 340 7.3 j 0.34 j 0.63 j 6200 400 12 <2.2 470 <1.4 40 j 14 86 23 84B-011 (2-2.5) 2 - 2.5 06/07/2019 6.0 2.9 <2.5 83 j 3.5 j <1.3 0.26 j 1600 140 j 6.2 0.94 j 150 j <1.3 <250 3.2 18 4.6 84B-022 (0-0.5) 0 - 0.5 06/07/2019 4.3 1.5 2.4 j 290 17 0.32 j 1.3 6500 540 21 0.6 j 580 <1.4 83 j 10 76 30 84B-022 (2-2.5) 2 - 2.5 06/07/2019 4.2 0.36 j <2.6 48 j 6.8 j <1.1 <0.74 790 <260 1.9 <2.1 <260 <1.4 <260 1.2 290 2 84B-024 (0-0.5) 0 - 0.5 06/07/2019 4.9 1 5 910 18 0.32 j 1.1 6200 890 20 <2.2 1200 <1.4 84 j 35 99 35 84B-024 (2-2.5) 2 - 2.5 06/07/2019 3.5 0.56 j <3.6 200 j 8 j <1.5 <1 410 <360 1.9 <2.9 <360 <1.9 <360 5.3 970 1.7 j 84B-026 (0-0.5) 0 - 0.5 06/07/2019 4.9 0.98 2.3 290 4.2 j 0.28 j 0.7 5800 380 14 <1.8 430 <1.1 46 j 9.1 54 22 84B-026 (2-2.5) 2 - 2.5 06/07/2019 3.9 0.76 <2.3 <230 7.3 j <1.3 <0.65 300 <230 0.91 1 j <230 <1.2 <230 0.64 j 130 1.3 84B-028 (0-0.5) 0 - 0.5 06/07/2019 7.6 2.5 1.2 j 2300 4.6 j <1.1 0.54 j 4600 320 16 0.71 j 280 0.59 j <220 8.3 35 15 84B-028 (2-2.5) 2 - 2.5 06/07/2019 7.0 <0.49 <2.4 41 j 2.8 j <1.3 <0.68 350 <240 1.9 <1.9 33 j <1.3 <240 0.7 j 11 j 0.99 j 84B-030 (0-0.5) 0 - 0.5 06/07/2019 4.6 1.5 2.8 520 9.6 j <1.1 0.99 8800 500 19 <2.2 560 <1.4 56 j 20 160 28 84B-030 (2-2.5) 2 - 2.5 06/07/2019 7.5 1.1 1.3 j 7100 2.9 j <1.1 0.27 j 1200 690 8.6 <2 96 j <1.3 <250 12 80 3.5 84B-042 (0-0.5) 0 - 0.5 06/07/2019 5.5 7.3 1.6 j 460 2.4 j <1.1 0.64 j 3300 310 11 8.3 370 0.62 j 33 j 16 110 16 84B-042 (2-2.5) 2 - 2.5 06/07/2019 5.3 0.47 j <2.6 36 j 6.5 j <1.3 <0.74 180 <260 1.8 <2.1 <260 <1.4 <260 1.2 75 0.8 j 84B-044 (0-0.5) 0 - 0.5 06/07/2019 5.3 1.7 1.8 j 590 7 j 0.32 j 0.53 j 4100 310 11 0.55 j 370 <1.1 41 j 13 50 16 84B-044 (2-2.5) 2 - 2.5 06/07/2019 4.6 0.87 <2.4 76 j 10 j <1.3 <0.68 730 <240 1.6 0.67 j 39 j <1.3 <240 2 120 2.1 84B-046 (0-0.5) 0 - 0.5 06/07/2019 5.0 1.6 2.4 560 23 0.38 j 0.8 6700 460 15 <1.8 540 <1.2 57 j 21 19 25 84B-046 (2-2.5) 2 - 2.5 06/07/2019 5.5 0.33 j <3.3 <330 4.9 j <1.4 <0.91 540 <330 2.1 <2.6 41 j <1.7 <330 0.92 j 10 j 1.6 j 84B-049 (0-0.5) 0- 0.5 06/07/2019 6.7 <0.5 <2.7 440 8.5 j <1.3 <0.7 270 M <270 1.5 <2.2 <270 <1.3 <270 2.2 33 0.83 j 84B-049 (2-2.5) 2- 2.5 06/07/2019 4.7 1.5 3.2 470 9 j 0.39 j 1 9500 550 21 <2.3 550 <1.5 57 j 22 87 31 Page 1 of 6 TABLE 5-3A SUMMARY OF UNSATURATED SOIL ANALYTICAL RESULTS - SOURCE AREA 1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter pH Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Iron Magnesium Manganese Molybdenum Potassium Selenium Sodium Strontium Sulfate Vanadium Reporting Units S.U. mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg PSRG Protection of Groundwater NE 5.8 45 225A 938A 3.8 0.9 150 18.. 65 7.1 91A 2.1 131A 1500 1,438 350 2018 Approved Background Threshold Values 4.8-6.6 0.772 3.3 340 16 NE 0.89 2750 290 5.32 2.7 290 1.7 340 1.29 16 8.16 2020 Provisional Background Threshold Values 4.8 - 6.7 1.8 3 290 275 NE 1.2 2533 290 13 2.4 290 1.9 290 1 275 it Sample ID Depth Interval (FEET BGS) Sample I Collection Date Analytical Results 1984 Ash Basin Soil Samples - Southeast of 1971 Ash Basin - Closure Samples (Continued) 84B-051 (0-0.5) 0 - 0.5 06/06/2019 5.3 1.9 3.4 740 8.4 j 0.36 j 0.8 6400 600 20 2.2 j 630 <1.5 57 j 37 45 25 84B-051 (2-2.5) 2 - 2.5 06/06/2019 3.5 0.36 j <2.2 76 j 4.8 j <1.1 <0.61 1100 40 j 2.7 <1.7 35 j <1.1 <220 2.7 550 2.2 84B-064 (0-0.5) 0 - 0.5 06/06/2019 6.2 11 3.3 950 12 j 0.37 j 1.1 9100 710 22 4.7 700 0.67 j 74 j 37 95 31 84B-064 (2-2.5) 2 - 2.5 06/06/2019 3.5 <0.52 <2.6 47 j 6.4 j <1.1 <0.72 550 <260 1.5 <2.1 <260 <1.3 <260 1.9 620 1.5 84B-066 (0-0.5) 0 - 0.5 06/06/2019 6.5 2.6 1.1 j 300 3 j <1.1 0.37 j 3300 190 7.2 1.6 200 <1 <190 12 <11 9.4 84B-066 (2-2.5) 2 - 2.5 06/06/2019 3.5 <0.58 <2.9 <290 6.8 j 0.37 j <0.81 460 <290 1.3 <2.3 <290 <1.5 <290 0.95 j 100 1.2 j 84B-068 (0-0.5) 0 - 0.5 06/06/2019 3.8 1.9 1.5 j 1500 9.9 j <1.2 M 29 7900 1700 91 <1.9 680 0.99 j 110 j 40 170 M 40 84B-068 (2-2.5) 2 - 2.5 06/06/2019 4.8 0.48 j <2.4 110 j <11 <1.1 <0.69 420 <240 3.5 <2 <240 <1.3 <240 2.2 <11 0.75 j 84B-069 (0-0.5) 0 - 0.5 06/19/2019 6.4 2.7 2.5 570 2.4 j 0.35 j 0.8 7800 330 11 0.67 j 400 <1.1 29 j 17 39 23 84B-069 (2-2.5) 2 - 2.5 06/19/2019 6.5 1.3 <2.3 180 j 2.4 j <1.1 <0.65 710 36 j 3.2 0.72 j 40 j <1.2 <230 4.4 16 2.9 84B-071 (0-0.5) 0 - 0.5 06/06/2019 4.0 2.1 5.6 760 8.1 j 0.68 j 1.3 13000 990 21 <1.6 1200 0.52 j 95 j 45 120 39 84B-071 (2-2.5) 2 - 2.5 06/06/2019 3.3 <0.51 <2.5 100 j 6.3 j <1.3 <0.71 910 <250 3.2 <2 <250 <1.3 <250 4.8 1300 2.1 84B-073 (0-0.5) 0 - 0.5 06/06/2019 4.5 1.5 3.7 220 j 15 0.61 j 0.97 9900 570 21 <2 610 <1.3 41 j 12 130 30 84B-073 (2-2.5) 2 - 2.5 06/06/2019 4.0 <0.48 <2.4 <240 15 <1.3 <0.68 360 <240 1.2 <1.9 <240 <1.3 <240 1.5 77 0.7 j 84B-086 (0-0.5) 0 - 0.5 06/06/2019 5.0 3 3.2 650 16 0.35 j 0.91 6800 570 17 1.2 j 620 <1.3 73 j 33 66 25 84B-086 (2-2.5) 2 - 2.5 06/06/2019 4.3 0.99 <3 <300 12 j 0.32 j <0.84 730 <300 1.6 1 j 38 j <1.6 <300 2 130 1.9 84B-088 (0-0.5) 0 - 0.5 06/06/2019 5.0 13 M 2.4 j 940 12 0.37 j 1.2 10000 M 720 19 2 j 670 M 0.48 j 61 j 37 90 44 84B-088 (2-2.5) 2 - 2.5 06/06/2019 3.8 0.86 <2.9 63 j 18 <1.3 <0.8 310 <290 2.4 0.66 j <290 <1.5 52 j 2.5 250 M 1.3 j 84B-091 (0-0.5) 0 - 0.5 06/07/2019 5.2 4.9 2 480 2.9 j <1.1 0.73 5000 280 9.5 2.1 350 0.4 j 31 j 21 26 16 84B-091 (2-2.5) 2 - 2.5 06/07/2019 6.6 0.55 j <2.9 120 j 3.9 j <1.3 <0.82 1100 96 j 2.7 0.61 j 86 j <1.5 <290 2.8 39 3.3 84B-093 (0-0.5) 0 - 0.5 06/07/2019 4.4 3.7 7.9 800 10 j 0.26 j 1.5 13000 920 20 2.8 1100 <1.3 78 j 48 110 42 84B-093 (2-2.5) 2 - 2.5 06/07/2019 3.2 <0.55 <2.7 <270 6.6 j <1.2 <0.76 490 <270 0.99 <2.2 <270 <1.4 <270 1.3 440 1.4 84B-095 (0-0.5) 0 - 0.5 06/07/2019 6.4 3.1 7 M 730 20 <1.3 1.3 7300 M 700 18 <2.3 860 <1.3 55 j 52 92 35 84B-095 (2-2.5) 2 - 2.5 06/07/2019 6.6 <0.48 <2.4 40 j 7.9 j <1.2 <0.67 170 <240 0.58 j <1.9 <240 <1.3 <240 1.9 17 0.3 j 84B-109 (0-0.5) 0 - 0.5 06/06/2019 3.9 2 4.6 450 13 0.56 j 0.94 9500 640 16 <1.9 770 <1.2 58 j 29 210 35 84B-109 (2-2.5) 2 - 2.5 06/06/2019 3.3 0.18 j <2 <200 <11 <1.1 <0.57 75 <200 0.55 j <1.6 <200 <1.1 <200 0.74 j 84 0.31 j 84B-111 (0-0.5) 0 - 0.5 06/06/2019 5.1 3.6 3.9 660 4.6 j 0.4 j 0.95 8600 680 19 2.3 750 <1.3 48 j 39 96 31 84B-111 (2-2.5) 2 - 2.5 06/06/2019 2.7 0.96 <2.5 240 j 2.2 j <1.1 0.36 j 640 <250 2 0.65 j <250 <1.3 <250 13 1100 2.2 84B-113 (0-0.5) 0 - 0.5 06/06/2019 4.5 6.7 2.4 j 500 4 j 0.23 j 1.2 4500 320 11 1.5 j 420 3.2 42 j 18 160 20 84B-113 (2-2.5) 2 - 2.5 06/06/2019 6.3 62 <2.4 730 <11 <1.1 <0.67 1600 65 j 11 0.94 j 35 j 0.98 j <240 38 <11 6.4 84B-115 (0-0.5) 0 - 0.5 06/05/2019 6.1 8.6 4.9 820 <12 0.27 j 1.5 7100 630 15 11 880 0.98 j 57 j 40 14 25 84B-115 (2-2.5) 2 - 2.5 06/05/2019 6.1 1.2 <2.1 31 j <12 <1.2 <0.59 710 58 j 2.7 1.1 j 73 j <1.1 <210 1.5 11 j 1.9 84B-117R (0-0.5) 0 - 0.5 08/21/2019 4.8 2.8 6.1 540 22 0.47 j 0.7 j 5800 550 13 7.3 790 <1.7 76 j 34 98 15 84B-117R (2-2.5) 2 - 2.5 08/21/2019 6.8 0.25 j <2.9 <290 <12 <1.2 <0.85 310 <290 0.7 j 0.76 j 38 j <1.6 <290 1 j <12 0.71 j 84B-119 (0-0.5) 0 - 0.5 06/06/2019 4.4 9.1 6.6 1200 8.1 j 0.33 j 2.2 8000 810 21 17 990 1.3 110 j 78 73 M 36 84B-119 (2-2.5) 2 - 2.5 06/06/2019 6.0 1.9 1.4 j 96 j 4 j <1.1 <0.63 730 67 j 2.5 3.7 78 j <1.2 <220 6.8 <11 2.6 84B-134 (0-0.5) 0 - 0.5 06/03/2019 5.6 7.1 5.9 950 9.9 j <1.1 1.3 4700 460 13 9.1 710 1.1 65 j 57 130 20 84B-134 (2-2.5) 2 - 2.5 06/03/2019 5.7 0.65 0.79 j 32 j 2.5 j <1.1 <0.55 150 <200 0.88 1.2 j 29 j <1 <200 1.7 17 0.6 j 84B-136 (0-0.5) 0 - 0.5 06/03/2019 6.2 14 8.4 1000 17 <1.3 2 6300 560 15 9.8 840 1.5 150 j 76 92 28 84B-136 (2-2.5) 2 - 2.5 06/03/2019 4.9 0.48 1.7 j 150 j 16 <1.4 <0.66 400 <230 1.2 1.4 j <230 <1.2 <230 9.1 490 1.5 84B-138 (0-0.5) 0 - 0.5 06/06/2019 6.1 6.2 4.7 870 18 <1.2 0.99 12000 540 12 16 620 0.66 j 63 j 52 34 30 84B-138 (2-2.5) 2 - 2.5 06/06/2019 5.2 0.38 j <2.1 38 j 3.1 j <1.1 <0.58 1400 74 j 2.5 0.58 j 62 j <1.1 <210 1.9 11 2.5 84B-140 (0-0.5) 0 - 0.5 07/01/2019 6.8 4.1 <2.5 410 <10 0.24 j 0.37 j 1500 86 j 5.7 0.62 j 130 j <1.3 <250 7.5 <10 5.1 84B-140 (2-2.5) 2 - 2.5 07/01/2019 6.8 0.411 <2.6 98 j <11 0.28 j 0.41 j 1200 120 j 5.2 <2.1 120 j <1.4 <260 4.2 8 j 2.9 84B-142 (0-0.5) 0 - 0.5 06/03/2019 6.0 11 8.6 1200 18 <1.3 2.9 6400 M 760 19 3 1100 M 1.5 120 j 73 M 140 31 84B-142 (2-2.5) 2 - 2.5 06/03/2019 6.2 0.93 0.92 j 61 j 5 j <1 0.37 j 940 50 j 3.6 0.93 j 61 j <1.1 <200 3.7 11 1.7 Page 2 of 6 TABLE 5-3A SUMMARY OF UNSATURATED SOIL ANALYTICAL RESULTS - SOURCE AREA 1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter pH Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Iron Magnesium Manganese Molybdenum Potassium Selenium Sodium Strontium Sulfate Vanadium Reporting Units S.U. mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg PSRG Protection of Groundwater NE 5.8 45 225A 938A 3.8 0.9 150 18.. 65 7.1 91A 2.1 131A 1500 1,438 350 2018 Approved Background Threshold Values 4.8-6.6 0.772 3.3 340 16 NE 0.89 2750 290 5.32 2.7 290 1.7 340 1.29 16 8.16 2020 Provisional Background Threshold Values 4.8-6.7 1.8 3 290 275 NE 1.2 2533 290 13 2.4 290 1.9 290 1 275 it Sample ID Depth Interval (FEET BGS) Sample I Collection Date Analytical Results 1984 Ash Basin Soil Samples - Southeast of 1971 Ash Basin - Closure Samples (Continued) 84B-144 (0-0.5) 0 - 0.5 06/03/2019 4.6 4.9 3.9 460 5 j <1.1 1.1 4400 370 11 2.1 520 0.44 j 50 j 26 150 16 84B-144 (2-2.5) 2 - 2.5 06/03/2019 5.0 0.29 j <2.2 <220 4.9 j <1.1 <0.61 370 <220 1.2 <1.7 36 j <1.1 <220 1.1 28 0.8 j 84B-146 (0-0.5) 0 - 0.5 06/03/2019 5.0 3 6.5 520 17 0.63 j 2.1 13000 600 16 <1.6 730 0.5 j 51 j 44 160 22 84B-146 (2-2.5) 2 - 2.5 06/03/2019 5.8 0.23 j 1.7 j 39 j 33 <1.2 <0.8 720 41 j 1.8 0.87 j 51 j <1.5 49 j 1.9 88 1.7 84B-162 (0-0.5) 0 - 0.5 06/04/2019 5.1 8.7 7.3 870 8.6 j 0.28 j 2.4 M 8700 M 530 12 6.2 650 1 j <270 48 110 31 84B-162 (2-2.5) 2 - 2.5 06/04/2019 5.4 <0.5 <2.5 52 j 3.8 j <1.1 <0.71 1100 <250 2.8 <2 41 j <1.3 <250 1.2 22 2.7 84B-164 (0-0.5) 0 - 0.5 06/03/2019 5.9 15 7 1000 7 j <1.2 2 8300 680 17 10 870 1.4 81 j 79 84 30 84B-164 (2-2.5) 2 - 2.5 06/03/2019 5.8 6.7 1 j 130 j 3.3 j <1.1 <0.65 260 <230 1.6 9.4 <230 <1.2 <230 8 220 1.1 j 84B-166 (0-0.5) 0 - 0.5 06/03/2019 5.1 2.9 6 780 65 0.28 j 0.95 16000 630 22 <1.9 630 <1.2 58 j 40 65 36 84B-166 (2-2.5) 2 - 2.5 06/03/2019 5.3 0.2 j <2.1 <210 7.2 j <1.1 <0.58 360 <210 1.5 0.68 j 35 j <1.1 <210 0.84 15 0.89 j 84B-170 (0-0.5) 0 - 0.5 07/01/2019 6.6 <0.51 <2.6 33 j <10 0.21 j <0.72 450 <260 1.7 <2.1 <260 <1.3 <260 0.42 j <10 1.2 j 84B-170 (2-2.5) 2 - 2.5 07/01/2019 6.6 5.3 <2.5 95 j <10 0.24 j 0.26 j 1300 70 j 3 <2 75 j <1.3 <250 4.8 9.7 j 2 84B-172 (0-0.5) 0 - 0.5 07/08/2019 6.6 13 8.1 1100 3.7 j 0.3 j 2 6500 680 16 7.5 990 1.3 58 j 54 29 28 84B-172 (2-2.5) 2 - 2.5 07/08/2019 7.1 4.9 1.6 j 110 j <11 0.22 j 0.56 j 890 130 j 3.1 3.1 130 j <1.2 <250 6.2 27 3.1 84B-174 (0-0.5) 0 - 0.5 06/03/2019 4.5 8.5 8.2 940 27 <1.2 2.3 9700 950 21 1.4 j 1300 1.2 j 110 j 60 87 36 84B-174 (2-2.5) 2 - 2.5 06/03/2019 4.5 2.7 1.6 j 160 j 9.2 j <1.1 0.2 j 710 43 j 2.8 1.8 42 j 0.4 j <180 7.6 380 2 84B-176 (0-0.5) 0 - 0.5 06/03/2019 4.6 1.3 6.4 670 16 <1.2 0.85 6700 740 17 <1.8 830 <1.2 74 j 32 13 23 84B-176 (2-2.5) 2 - 2.5 06/03/2019 4.5 0.51 0.86 j 57 j <11 <1.1 0.22 j 1400 86 j 4 <1.6 79 j <1.1 <200 2.8 91 3.7 84B-184 (0-0.5) 0 - 0.5 06/03/2019 5.8 2.4 3.4 500 25 <1.3 1.4 5200 480 20 <1.9 530 <1.3 93 j 21 490 21 84B-184 (2-2.5) 2 - 2.5 06/03/2019 4.8 0.2 j <2 <200 2.2 j <1 <0.55 370 <200 2.2 <1.6 32 j <1 <200 0.96 37 1.2 84B-194 (0-0.5) 0 - 0.5 06/04/2019 5.3 19 7.3 960 10 j <1.2 2 7200 560 14 20 760 1.4 49 j 64 120 27 84B-194 (2-2.5) 2 - 2.5 06/04/2019 4.6 2.7 <2.6 <260 3.6 j <1.1 <0.73 25 <260 1 7.2 <260 <1.4 <260 1.4 68 0.35 j 84B-196 (0-0.5) 0 - 0.5 06/04/2019 5.3 3.2 6.6 970 4.4 j 0.29 j 1.3 5300 600 21 3.4 650 <1.4 <280 54 140 28 84B-196 (0-0.5) 0 - 0.5 06/07/2019 6.5 10 5 j 1000 11 j <1.2 1 15000 620 13 130 800 0.53 j 50 j 61 160 54 84B-196 (2-2.5) 2 - 2.5 06/04/2019 4.3 0.48 j <2.6 54 j 4.7 j <1.1 <0.73 270 <260 0.95 2.4 <260 <1.4 <260 4.1 250 1.3 j 84B-196 (2-2.5) 2 - 2.5 06/07/2019 3.9 0.36 j 2 j 130 j 4.2 j <1 <0.64 300 <230 1.5 1.4 j <230 <1.2 <230 7.4 530 1.5 84B-198 (0-0.5) 0 - 0.5 06/04/2019 6.2 6 9.8 990 25 <1.2 1.3 8100 550 14 4.5 710 0.75 j 55 j 69 40 28 84B-198 (0-0.5) 0 - 0.5 06/07/2019 7.1 17 6.9 840 15 <1.3 1.5 7200 500 13 31 570 0.61 j 77 j 63 29 28 84B-198 (2-2.5) 2 - 2.5 06/04/2019 3.4 0.3 j 1.8 j 160 j 8.6 j <1.1 0.28 j 730 <200 1.9 <1.6 <200 <1.1 <200 6.2 550 1.5 84B-198 (2-2.5) 2 - 2.5 06/07/2019 3.3 0.31 j 14 690 6.8 j <1.1 0.36 j 550 110 j 8.9 <1.8 <230 <1.1 35 j 18 770 M 1.2 84B-203 (0-0.5) 0 - 0.5 07/09/2019 6.7 4.2 1.9 j 270 <11 0.25 j 0.66 j 2400 220 j 6.5 1.6 j 330 <1.3 <260 16 <11 9.5 84B-203 (2-2.5) 2 - 2.5 07/09/2019 6.6 3.6 <2.6 69 j <11 0.23 j 0.32 j 830 52 j 2.3 0.72 j 63 j <1.4 <260 3 <11 2.1 84B-205 (0-0.5) 0 - 0.5 07/09/2019 6.0 3.1 4 500 2.8 j,B 0.36 j 0.57 j 3500 330 8.8 3.9 410 <1.5 39 j 26 84 12 84B-205 (2-2.5) 2 - 2.5 07/09/2019 6.5 2.2 <2.6 54 j 2.5 j,B 0.23 j <0.72 700 47 j 2.5 3.8 54 j <1.3 <260 3.6 19 1.5 84B-207 (0-0.5) 0 - 0.5 06/05/2019 6.3 12 12 1800 24 <1.2 2 11000 1000 25 8.5 1400 0.85 j 140 j 73 70 39 84B-207 (2-2.5) 2 - 2.5 06/05/2019 4.4 0.94 <2.6 <260 13 <1.1 <0.72 220 <260 0.84 <2.1 <260 <1.3 <260 1.3 190 0.41 j 84B-209 (0-0.5) 0 - 0.5 06/05/2019 6.2 29 11 1400 38 <1.2 2.6 13000 1000 28 16 1500 1.4 200 j 87 74 44 84B-209 (2-2.5) 2 - 2.5 06/05/2019 6.5 0.77 1.6 j 110 j 35 <1.1 <0.68 2600 160 j 5.6 1.6 j 130 j <1.3 55 j 5.2 33 8.5 84B-217 (0-0.5) 0 - 0.5 06/04/2019 5.9 3 3.3 490 7.2 j <1.2 0.72 2700 290 8.4 5.7 370 <1.3 <250 32 36 15 84B-217 (2-2.5) 2 - 2.5 06/04/2019 5.8 0.4 j <2.8 <280 31 <1.3 <0.78 90 <280 0.36 j 0.6 j <280 <1.5 <280 1 j 39 0.32 j 84B-229 (0-0.5) 0 - 0.5 06/05/2019 6.5 21 11 1100 12 <1.2 3.9 6700 640 22 6.8 1200 1.7 170 j 96 67 41 84B-229 (2-2.5) 2 - 2.5 06/05/2019 6.4 0.97 12 900 15 <1.2 M 0.74 j 700 86 j 6.5 0.69 j 48 j 1.5 34 j 38 300 7.1 84B-231 (0-0.5) 0 - 0.5 06/04/2019 4.8 2.3 5.9 650 14 0.34 j 0.99 8700 560 17 <1.9 600 <1.2 <240 25 96 29 84B-231 (2-2.5) 2 - 2.5 06/04/2019 3.6 0.59 1.5 j 71 j 4 j <1.1 <0.56 740 <200 1.7 <1.6 36 j <1 <200 3.4 390 1.5 84B-233 (0-0.5) 0 - 0.5 06/04/2019 6.0 3.2 4.1 660 4.4 j <1.3 0.8 3700 320 13 5.5 370 <1.3 <250 40 <13 18 (2-2.5) 2 - 2.5 06/04/2019 6.0 13 3.6 290 3.9 j <1.1 <0.66 950 <230 1.7 24 45 j I <1.2 <230 21 19 2.4 IL84B-233 84B-237 (0-0.5) 0 - 0.5 07/11/2019 6.3____L 5.7 1.4 j 270 <11 0.25 j 0.57 j 2300 B 1701 9.4 2.3 220 j 1 0.54 j <270 11 17 10 Page 3 of 6 TABLE 5-3A SUMMARY OF UNSATURATED SOIL ANALYTICAL RESULTS - SOURCE AREA 1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter pH Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Iron Magnesium Manganese Molybdenum Potassium Selenium Sodium Strontium Sulfate Vanadium Reporting Units S.U. mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg PSRG Protection of Groundwater NE 5.8 45 225A 938A 3.8 0.9 150 18.. 65 7.1 91A 2.1 131A 1500 1,438 350 2018 Approved Background Threshold Values 4.8 - 6.6 0.772 3.3 340 16 NE 0.89 2750 290 5.32 2.7 290 1.7 340 1.29 16 8.16 2020 Provisional Background Threshold Values 4.8 - 6.7 1.8 3 290 275 NE 1.2 2533 290 13 2.4 290 1.9 290 1 275 it Sample ID Depth Interval (FEET BGS) Sample I Collection Date Analytical Results 1984 Ash Basin Soil Samples - Southeast of 1971 Ash Basin - Closure Samples (Continued) 84B-237 (2-2.5) 2 - 2.5 07/11/2019 7.0 8 2.3 j 210 j <14 0.33 j <0.93 810 B 52 j 4 1.4 j 50 j <1.7 <340 9.3 <14 2.4 84B-239 (0-0.5) 0 - 0.5 07/11/2019 4.9 2.9 5.9 510 15 0.34 j 1 8800 B 780 20 <2.3 840 <1.5 68 j 23 25 27 84B-239 (2-2.5) 2 - 2.5 07/11/2019 5.5 0.41 j <2.6 <260 2.6 j 0.25 j <0.73 400 B <260 1.2 <2.1 <260 <1.4 <260 0.66 j <11 0.97 j 84B-241 (0-0.5) 0 - 0.5 07/09/2019 6.5 2.4 1.5 j 690 7 j,B 0.26 j 0.47 j 1400 130 j 5.4 0.7 j 200 j <1.5 <280 12 55 4.6 84B-241 (2-2.5) 2 - 2.5 07/09/2019 6.4 0.94 1.5 j 130 j 7.8 j,B <1.1 <0.73 350 <260 1 <2.1 <260 <1.4 <260 6.6 33 0.65 j 84B-243 (0-0.5) 0 - 0.5 06/05/2019 6.0 12 13 1300 60 <1.2 1.1 24000 1200 18 <2.1 1200 0.57 j 130 j 63 100 30 84B-243 (2-2.5) 2 - 2.5 06/05/2019 4.9 1.1 0.89 j 29 j 18 <1 0.22 j 560 29 j 1.3 0.5 j 39 j <1 <200 1.5 98 1.1 84B-245 (0-0.5) 0 - 0.5 06/05/2019 6.2 25 13 1400 35 <1.2 2.9 12000 1100 25 9 1500 1.3 j 150 j 88 82 44 84B-245 (2-2.5) 2 - 2.5 06/05/2019 5.8 24 1.6 j 180 j 15 <1.1 <0.63 970 75 j 2.3 15 95 j <1.2 <230 11 160 3.8 84B-253 (0-0.5) 0 - 0.5 06/05/2019 6.9 14 8.4 1400 3.1 j <1.2 1.9 9400 660 18 6.5 850 0.72 j 90 j 90 59 29 84B-253 (2-2.5) 2 - 2.5 06/05/2019 5.8 0.84 <2.5 47 j 14 <1.3 <0.7 620 <250 1.7 1.2 j 39 j <1.3 32 j 2.1 43 2.2 84B-264 (0-0.5) 0 - 0.5 06/06/2019 5.8 5.3 3.4 410 10 j <1.5 0.59 j 4400 210 j 9.9 9.3 290 j <1.7 <320 22 43 13 84B-264 (2-2.5) 2 - 2.5 06/06/2019 3.9 1.8 <2.6 50 j 3 j <1 <0.72 610 <260 1.5 2.5 <260 <1.3 <260 2.9 100 1.2 j 84B-266 (0-0.5) 0 - 0.5 06/06/2019 6.5 41 20 M 2800 M 9 j 0.32 j 8.2 M 9500 M 1000 M 41 M 4 M 2300 M 4.4 350 M 240 M 77 78 M 84B-266 (2-2.5) 2 - 2.5 06/06/2019 4.7 0.41 2.4 160 j 13 <1.2 <0.61 1300 58 j 3.7 <1.8 65 j <1.1 28 j 4.1 67 3.2 84B-268 (0-0.5) 0 - 0.5 06/05/2019 4.9 4.3 6.8 960 8.6 j 0.23 j 1.4 7200 730 24 8.6 620 <1.4 49 j 59 140 36 84B-268 (2-2.5) 2 - 2.5 06/05/2019 6.0 0.45 j 1.6 j 110 j 19 <1.3 <0.82 640 <290 1.6 2.2 j 38 j <1.5 <290 5.8 52 1.5 84B-272 (0-0.5) 0 - 0.5 07/11/2019 6.3 46 5.4 800 <12 0.35 j 1.1 11000 B 730 15 11 880 <1.6 69 j 42 7.1 j 35 84B-272 (2-2.5) 2 - 2.5 07/11/2019 6.6 2 <2.7 <270 <11 0.23 j <0.68 460 B <270 2.4 <2.2 42 j <1.3 <270 1.3 <11 1.5 84B-274 (0-0.5) 0 - 0.5 07/09/2019 5.0 1.3 4.2 430 28 B 0.36 j 1.1 8800 680 21 <2.2 570 <1.4 75 j 21 210 32 84B-274 (2-2.5) 2 - 2.5 07/09/2019 6.9 1 <2.6 39 j 2.7 j,B <1 <0.72 350 <260 1.6 0.64 j 40 j <1.3 <260 2.4 <10 0.67 j 84B-276 (0-0.5) 0 - 0.5 07/09/2019 5.6 <0.54 <2.7 <270 <11 <1.1 <0.75 270 <270 2 <2.2 <270 <1.4 <270 0.54 j <11 0.92 j 84B-276 (2-2.5) 2 - 2.5 07/09/2019 4.3 <0.48 <2.5 <250 5.8 j,B 0.23 j <0.68 47 <250 0.56 j <2 <250 <1.3 <250 0.47 j 66 <1.3 84B-278 (0-0.5) 0 - 0.5 06/06/2019 6.1 38 9.5 1400 4.4 j 0.23 j 2.2 11000 840 18 27 1300 1.5 120 j 100 58 30 84B-278 (2-2.5) 2 - 2.5 06/06/2019 5.5 17 1.6 j 190 6 j <1 <0.53 1200 51 j 3.3 24 60 j <0.99 <190 12 59 3.4 84B-280 (0-0.5) 0 - 0.5 06/06/2019 6.4 12 11 1400 8.6 j <1.3 1.3 8300 900 17 12 1100 0.74 j 120 j 68 <13 30 84B-280 (2-2.5) 2 - 2.5 06/06/2019 4.2 0.75 1 j 39 j 14 <1.2 <0.67 110 <240 1.4 <1.9 <240 <1.2 <240 1.6 100 0.46 j 84B-303 (0-0.5) 0 - 0.5 06/06/2019 5.3 3.6 1.5 j 370 4.1 j <1.2 0.8 1900 170 j 8 0.93 j 230 0.45 j <230 18 120 8 84B-303 (2-2.5) 2 - 2.5 06/06/2019 7.1 7.6 1.2 j 440 3.2 j <1.3 0.36 j 150 <280 1.1 6.6 <280 4.4 <280 5.7 40 3.1 84B-307 (0-0.5) 0 - 0.5 07/11/2019 6.5 2.9 <2.5 72 j <10 0.22 j <0.7 490 B 36 j 1.7 2.3 41 j <1.3 <250 3.6 9.3 j 2.5 84B-307 (2-2.5) 2 - 2.5 07/11/2019 6.9 4.3 <2.5 71 j <11 <1.1 <0.73 410 B <250 1.8 0.52 j <250 <1.4 <250 3.8 5.5 j 0.87 j 84B-309 (0-0.5) 0 - 0.5 07/10/2019 6.2 15 4.3 820 3.2 j,B 0.26 j 1 7300 580 17 6.5 640 <1.3 74 j 42 71 33 84B-309 (2-2.5) 2 - 2.5 07/10/2019 6.9 1.8 <2.4 59 j 3.1 j <1 <0.68 540 33 j 2 1.3 j 45 j <1.3 <240 2.9 <10 1.1 j 84B-311 (0-0.5) 0 - 0.5 07/10/2019 6.5 6.3 1.7 j 270 2.2 j,B 0.29 j 0.53 j 1600 140 j 7.1 1.6 j 200 j 0.51 j <260 13 47 13 84B-311 (2-2.5) 2 - 2.5 07/10/2019 6.5 1.4 <2.6 56 j 2.3 j,B <1.1 <0.72 690 49 j 3.5 <2.1 75 j <1.3 <260 2.5 7.4 j 2.1 84B-328 (0-0.5) 0 - 0.5 07/08/2019 5.3 2.3 6.6 1200 3.9 j 0.28 j 1.8 9700 900 30 <2.4 830 0.58 j 59 j 50 33 46 84B-328 (2-2.5) 2 - 2.5 07/08/2019 6.7 9.8 3.5 300 <11 <1.1 <0.74 380 33 j 2.2 1.7 j 47 j <1.4 <270 15 19 0.91 j 84B-330 (0-0.5) 0 - 0.5 07/08/2019 6.5 6.4 4.3 540 <11 0.27 j 0.86 6500 390 13 4.9 400 <1.4 <270 27 86 18 84B-330 (2-2.5) 2 - 2.5 07/08/2019 7.6 1.7 <2.5 55 j <10 0.22 j 0.3 j 450 <250 1.3 <2 34 j <1.3 <250 3.4 6.2 j 1.2 j 84B-332 (0-0.5) 0 - 0.5 07/08/2019 6.3 15 4.7 630 9.5 j 0.33 j 1.3 4000 400 16 5.3 540 0.78 j <300 39 200 18 84B-332 (2-2.5) 2 - 2.5 07/08/2019 7.2 3.9 <2.5 60 j 3.2 j 0.33 j <0.71 940 44 j 4.1 0.93 j 54 j <1.3 <250 4.4 22 2 84B-342 (0-0.5) 0 - 0.5 07/03/2019 4.2 1.2 4.2 760 4.5 j 0.38 j 1.3 11000 850 28 <2.1 870 <1.4 56 j 23 77 34 84B-342 (2-2.5) 2 - 2.5 07/03/2019 7.0 8.1 1 1 j 79 j 2.2 j <1.1 <0.69 990 M 75 j 4 <1.9 110 j <1.3 <240 3.4 <11 1.4 84B-344 (0-0.5) 0 - 0.5 07/03/2019 6.4 8.9 3 480 <10 <1 1.1 4300 270 9.5 3.8 420 0.89 j 33 j 30 70 14 84B-344 (2-2.5) 2 - 2.5 07/03/2019 7.1 7.5 2.2 j 300 <11 <1.1 0.28 j 530 63 j 3.5 5 68 j <1.3 <250 18 15 1.3 84B-346 (0-0.5) 0 - 0.5 07/03/2019 7.3 1.9 <2.5 120 j <10 <1 0.33 j 850 52 j 2 0.53 j 65 j 0.64 j <250 5.4 18 5.4 Page 4 of 6 TABLE 5-3A SUMMARY OF UNSATURATED SOIL ANALYTICAL RESULTS - SOURCE AREA 1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter pH Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Iron Magnesium Manganese Molybdenum Potassium Selenium Sodium Strontium Sulfate Vanadium Reporting Units S.U. mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg PSRG Protection of Groundwater NE 5.8 45 225A 938A 3.8 0.9 150 18.. 65 7.1 91A 2.1 131A 1500 1,438 350 2018 Approved Background Threshold Values 4.8-6.6 0.772 3.3 340 16 NE 0.89 2750 290 5.32 2.7 290 1.7 340 1.29 16 8.16 2020 Provisional Background Threshold Values 4.8-6.7 1.8 3 290 275 NE 1.2 2533 290 13 2.4 290 1.9 290 1 275 it Sample ID Depth Interval (FEET BGS) Sample I Collection Date Analytical Results 1984 Ash Basin Soil Samples - Southeast of 1971 Ash Basin - Closure Samples (Continued) 84B-346 (2-2.5) 2 - 2.5 07/03/2019 7.3 1.5 <2.4 72 j <11 <1.1 0.31 j 490 43 j 1.5 0.66 j 50 j 3.8 <240 2.8 <11 4.9 84B-354 (0-0.5) 0 - 0.5 07/03/2019 7.0 12 5.4 950 <11 0.22 j 1.9 6700 510 17 11 740 1.7 68 j 47 75 38 84B-354 (2-2.5) 2 - 2.5 07/03/2019 7.1 0.77 <2.4 48 j <10 <1 <0.68 120 <240 2.7 <1.9 45 j <1.3 <240 2.4 <10 0.82 j 84B-356 (0-0.5) 0 - 0.5 07/03/2019 6.7 35 12 1300 <11 0.29 j 7.7 11000 1000 45 2.7 2600 7.9 360 150 36000 60 84B-356 (2-2.5) 2 - 2.5 07/03/2019 7.0 5.1 2.6 490 <11 <1.1 <0.71 1300 120 j 3.7 2.2 120 j <1.3 <250 28 51 3.9 84B-364 (0-0.5) 0 - 0.5 07/03/2019 5.5 44 21 13000 2.8 j 0.28 j 9.9 16000 1500 79 2.1 j 2700 5.8 370 230 9.2 j 110 84B-364 (2-2.5) 2 - 2.5 07/03/2019 6.2 0.34 j <2.4 61 j <10 <1 <0.68 240 <240 1.6 0.49 j 31 j <1.3 <240 1.9 <10 0.58 j 84B-366 (0-0.5) 0 - 0.5 07/03/2019 6.7 3.1 1.4 j 160 j <13 0.31 j 0.43 j 1300 75 j 4.4 0.77 j 1301 0.73 j <310 8.7 <13 6.3 84B-366 (2-2.5) 2 - 2.5 07/03/2019 3.8 40 <3.1 59 j <13 <1.3 <0.88 700 <310 1.5 54 50 j <1.6 <310 5.4 220 5.2 84B-367 (0-0.5) 0 - 0.5 07/03/2019 5.2 2.3 4.7 880 3.2 j 0.46 j 0.88 14000 710 20 <2.3 800 <1.5 <290 25 71 29 84B-367 (2-2.5) 2 - 2.5 07/03/2019 7.1 1.1 <2.4 68 j <10 0.32 j <0.67 630 61 j 2.2 <1.9 78 j <1.2 <240 2.6 <10 6 84B-373 (0-0.5) 0 - 0.5 07/01/2019 5.9 4.1 3 800 3.5 j 0.52 j 1.2 10000 550 19 2.9 560 0.88 j <280 26 91 37 84B-373 (2-2.5) 2 - 2.5 07/01/2019 6.4 3.2 2.1 j 160 j <11 0.29 j <0.73 670 130 j 3.4 <2.1 150 j <1.3 <260 5.6 <11 5.9 Former Process Area Soil Samples - Southeast of 1971 Ash Basin - FPA Assessment Samples FPA-01SB (10-12) 10 - 12 07/16/2019 4.7 5 5.3 1400 2.4 j NA 3.8 12000 320 68 1.2 j 580 1.7 39 j 110 220 100 FPA-01SB (14-16) 14 - 16 07/16/2019 6.0 4.8 <2.4 130 j 2.2 j NA 0.6 j 990 110 j 4.6 <2 150 j <1.3 <240 7.1 100 150 FPA-02SB (4-6) 4 - 6 07/17/2019 7.6 <0.51 <2.6 <260 <11 NA 0.49 j 480 <260 5.6 <2.1 49 j <1.3 <260 0.74 j <11 2.5 FPA-03SB (1-2) 1-2 07/15/2019 7.5 19 4.9 1300 <11 NA 3.1 7200 500 32 <2.2 1300 0.6 j 150 j 72 <11 18 FPA-03SB (2-4) 2-4 07/15/2019 7.2 0.33 j <2.5 110 j <10 NA <0.7 1200 33 j 4.8 <2 68 j <1.3 <250 1.9 <10 3.3 FPA-05SB (9-11) 9 - 11 07/16/2019 8.1 0.93 <3 3600 <13 NA <0.84 1700 91 j 6.6 <2.4 110 j <1.6 <300 9.7 59 28 FPA-05SB (12-14) 12- 14 07/16/2019 7.6 2 <2.6 110 j <10 NA 0.36 j 1100 <260 3.5 <2.1 46 j <1.3 <260 2.9 19 29 FPA-06SB(8-10) 8-10 07/16/2019 8.0 21 5 35000 <10 NA 3.1 11000 810 57 4.2 940 3.5 130j 150 74 350 FPA-06SB (10-12) 10 - 12 07/16/2019 7.8 0.57 <2.6 140 j <11 NA 0.35 j 2900 56 j 15 0.74 j 120 j <1.4 <260 2.5 11 40 FPA-07SB (10-12) 10 - 12 07/16/2019 7.7 0.4 j 1.5 j 38000 <10 NA 0.56 j 2700 1 330 25 2.2 160 j <1.3 110 j 91 1 79 2.1 FPA-08SB (1-2) 1-2 07/16/2019 6.4 45 15 2200 2 j NA 9.6 14000 1200 65 0.98 j 3300 1.7 390 240 18 180 FPA-08SB (2-4) 2-4 07/16/2019 6.6 110 36 3800 <12 NA 21 22000 2700 120 1.2 j 7800 2.2 960 450 33 150 FPA-08SB (4-6) 4-6 07/16/2019 7.3 9.3 5.7 1500 <12 NA 2.2 5200 450 20 <2.4 1100 2.6 130 j 81 6.9 j 97 FPA-08SB (6-8) 6 - 8 07/16/2019 6.9 0.18 j <2.2 <220 <10 NA <0.62 220 <220 3.2 <1.8 <220 <1.1 <220 0.98 <10 2 Former Process Area Soil Samples - Southeast of 1971 Ash Basin - FPA Closure Samples FPA-01 (0-0.5) 0 - 0.5 02/27/2020 7.4 0.67 <2.3 150 j 1.5 j,B <1.1 0.28 j 1200 41 j 8.1 <1.8 76 j,B <1.2 <230 2 <11 7.6 FPA-01 (2-2.5) 2 - 2.5 02/27/2020 7.3 0.3 j <2.4 95 j 1.2 j,B <1.1 <0.67 680 <240 1.9 <1.9 40 j,B <1.3 <240 0.87 j <11 2.5 FPA-01 (7-7.5) 7 - 7.5 02/27/2020 7.3 0.29 j <2.6 280 1.4 j,B <1.1 <0.72 510 <260 1.5 <2.1 54 j,B 0.7 j <260 1.9 <11 11 FPA-01 (12-12.5) 12 - 12.5 02/27/2020 7.7 <0.56 <2.7 <270 2.3 j,B <1.2 <0.78 20 <270 0.58 j <2.1 <270 <1.5 <270 0.49 j 12 2.8 FPA-02 (0-0.5) 0 - 0.5 02/27/2020 7.1 94 42 4400 1.6 j,B 0.27 j,M 19 26000 2800 120 1.9 j 7200 B 5.9 j 870 490 <12 130 FPA-02 (0-6) 0 - 6 03/12/2020 7.1 0.36 j <2.2 80 j 1.5 j,B <1 <0.65 720 <220 3.9 <1.8 <220 <1.2 <220 1.1 <10 3 FPA-02R (0-6) 0 - 6 03/31/2020 7.8 0.92 <2.3 240 <11 <1.1 0.31 j 1100 34 j 5 <1.8 51 j <1.2 <230 2.4 <11 3.1 FPA-02 (2-2.5) 2 - 2.5 02/27/2020 7.0 100 39 4000 2.6 j,B 0.81 j 17 25000 2600 120 1.6 j 6700 B 6.2 j 810 450 6.4 j 100 FPA-02 (7-7.5) 7 - 7.5 02/27/2020 9.0 0.21 j <2.5 190 j 1.3 j,B <1 <0.69 63 <250 0.85 <2 35 j,B <1.3 <250 4.1 <10 0.94 j FPA-02 (12-12.5) 12 - 12.5 02/27/2020 6.4 0.63 <2.5 260 3.6 j,B 0.28 j <0.69 890 53 j 2.6 0.67 j 88 j,B 1.7 <250 3.8 <12 210 FPA-02 (24-30) 24 - 30 03/12/2020 6.7 35 6.9 2100 5.3 j,B 0.48 j,M 6.4 7200 M 630 43 <2.3 1800 2 160 j 100 M <13 130 FPA-02R (24-30) 24 - 30 03/31/2020 8.2 1.3 <2.2 550 2.6 j,B 0.22 j 0.32 j 940 451 5.8 <1.8 61 j <1.3 <220 3.2 6 j 3.9 FPA-03 (0-0.5) 0 - 0.5 02/27/2020 8.0 0.99 <2.3 15000 1.4 j,B <1.1 0.49 j 1500 320 13 <1.9 130 j,B <1.2 <230 23 <11 27 FPA-03 (2-2.5) 2 - 2.5 02/27/2020 8.0 0.41 j <2.4 210 j 1.4 j,B <1.1 0.26 j 1000 34 j 5 <1.9 57 j,B <1.2 <240 1.8 5.3 j 4.9 FPA-03 (7-7.5) 7 - 7.5 02/27/2020 7.6 6.8 <3 110 j 3.3 j,B <1.2 0.45 j 1200 60 j 3.4 <2.4 87 j,B <1.5 <300 1.9 34 32 FPA-04 (0-0.5) 0 - 0.5 02/27/2020 7.9 2 1.4 j 22000 7.8 j,B <1.2 0.79 j 1900 510 21 <2.3 180 j,B 0.6 j <290 39 12 41 FPA-04 (2-2.5) 2 - 2.5 02/27/2020 7.9 0.31 j <2.4 350 1.2 j,B <1.1 <0.73 M 1 440 M <240 2.2 <1.9 30 j,B <1.4 <240 1.7 9.1 j 18 M Page 5 of 6 TABLE 5-3A SUMMARY OF UNSATURATED SOIL ANALYTICAL RESULTS - SOURCE AREA 1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter pH Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Iron Magnesium Manganese Molybdenum Potassium Selenium Sodium Strontium Sulfate Vanadium Reporting Units S.U. mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg PSRG Protection of Groundwater NE 5.8 45 225^ 938^ 3.8 0.9 150 18^ 65 7.1 91^ 2.1 131^ 1500 1,438^ 350 2018 Approved Background Threshold Values 4.8 - 6.6 0.772 3.3 340 16 NE 0.89 2750 290 5.32 2.7 290 1.7 340 1.29 16 8.16 2020 Provisional Background Threshold Values 4.8 - 6.7 1.8 3 290 275 NE 1.2 2533 290 13 2.4 290 1.9 290 1 275 it Sample ID Depth Interval (FEET BGS) Sample I Collection Date Analytical Results Former Process Area Soil Samples - Southeast of 1971 Ash Basin - FPA Closure Samples (Continued) FPA-04 (7-7.5) 7 - 7.5 02/27/2020 7.9 0.47 <2.4 180 j 1.8 j,B 0.27 j <0.64 1900 87 j 4 <1.9 86 j <1.2 <240 1.4 21 50 FPA-04 (12-12.5) 12 - 12.5 02/27/2020 7.9 <0.5 <2.5 53 j 2.2 j,B <1.1 <0.7 480 <250 2.5 <2 33 j <1.3 <250 0.67 j 9.4 j 7.4 FPA-05 (0-0.5) 0 - 0.5 02/27/2020 7.5 0.32 j <2.8 <280 1.8 j,B <1.2 <0.78 360 <280 1.3 <2.2 43 j,B <1.5 <280 0.68 j <12 7.8 FPA-05 (2-2.5) 2 - 2.5 02/27/2020 7.5 0.36 j <2.5 58 j 2.3 j,B <1.1 <0.7 460 <250 1.9 <2 48 j,B <1.3 <250 0.98 j 14 12 FPA-05 (7-7.5) 7 - 7.5 02/27/2020 7.5 0.36 j <2.7 <270 2.4 j,B <1.2 <0.76 350 <270 1.7 <2.2 38 j,B <1.4 <270 0.69 j 10 j 7.5 FPA-05 (12-12.5) 12 - 12.5 02/27/2020 8.1 3.8 1.1 j 1900 2.5 j,B <1.1 1.1 3000 130 j 15 <1.9 180 j,B 0.83 j <240 17 5.9 j 83 FPA-06 (0-0.5) 0 - 0.5 02/27/2020 7.8 1.5 2.5 86000 3.2 j,B <1.1 0.25 j 2300 1300 22 <1.9 320 B 0.52 j <230 130 120 9.6 FPA-06 (2-2.5) 2 - 2.5 02/27/2020 7.6 0.4 j <2.4 300 1.7 j,B <1 <0.67 1400 38 j 2.6 <1.9 46 j,B <1.2 <240 1.1 80 4.1 FPA-06 (7-7.5) 7 - 7.5 02/27/2020 5.1 0.38 j <2.5 58 j 2.1 j,B <1 0.34 j 1200 63 j 5.7 <2 68 j,B <1.3 <250 0.71 j 88 2.9 FPA-06 (12-12.5) 12 - 12.5 02/27/2020 4.6 0.21 j <2.2 <220 1.8 j,B <1 0.33 j 590 <220 1.7 <1.8 40 j,B <1.2 <220 0.46 j 49 1.4 Downgradient of 1971 and 1984 Ash Basins AW-08C (0-2) 0 - 2 02/03/2015 5.4 <1.1 <2.7 <27 <267 NA <1.1 31.5 <27 <0.27 <0.54 <54 <1.1 <54 <0.54 <267 <1.1 AW-09C (2-4) 2-4 02/03/2015 6.7 <1 <2.6 <26.2 <262 NA <1 11.9 <26.2 <0.26 <0.52 <52.4 <1 <52.4 <0.52 <262 <1 MW-34C (4-6) 4-6 05/13/2014 6.3 0.709 U 0.851 U <40.5 <10.2 NA NA 342 <20.3 2.42 <2.03 <101 0.81 U 16.9 U <1.01 74.4 NA MW-36C (4-6) 4-6 05/09/2014 7.9 0.736 U 0.884 U 224 5.3 U NA NA 835 36 5.05 0.179 U <105 0.842 U 17.6 U 1.26 5.3 U NA Notes: 0 - Bold highlighted concentration indicates exceedance of the Inactive Hazardous Sites Branch PSRG Table (May 2019) for Protection of Groundwater or the Background Threshold Value (BTV), whichever is higher. 2018 Approved BTVs are based on the 14 May 2018 letter titles "Approval of Revised Background Threshold Values - L.V. Sutton Energy Complex" from NCDEQ < - Concentration not detected at or above the adjusted reporting limit. ^ - PSRG POG Calculated B - Target analyte detected in method blank at or above the reporting limit. Target analyte concentration in sample is less than 10X the concentration in the method blank. Analyte concentration in sample could be due to blank contamination. BGS - below ground surface j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit. M - Matrix spike / matrix spike dup failure. mg/kg - milligrams per kilogram NE - Not established PSRG - preliminary soil remediation goals S.U. - standard units U - Analyte was analyzed for, but not detected above the MDC. NA - Not Analyzed Prepared by: WJW Checked by: JYT Revised by: LWD & WJW Page 6 of 6 TABLE 5-3B SUMMARY OF UNSATURATED SOIL SPLP - SOURCE AREA 1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Iron Magnesium Manganese Molybdenum Potassium Selenium Sodium Strontium Sulfate Vanadium Reporting Units Ng/L Ng/L mg/L mg/L Ng/L Ng/L Ng/L mg/L Ng/L Ng/L mg/L Ng/L mg/L Ng/L mg/L Ng/L 15A NCAC 02L Standard 30 700 NE 250 10 1* 300 NE 50 NE NE 20 NE NE 250 0.3* Sample ID Depth Interval (FEET BGS) Sample Collection Date SPLP Results Background Soil Samples MW-37C (0-2) 0- 2 02/04/2015 <0.5 6.5 0.354 <5.3 <0.5 222 0.0266 2.4 <0.5 0.071 <0.5 1.73 0.75 1.6 j <1 MW-37C (4-6) 4- 6 02/04/2015 0.63 136 0.116 2.9 j <0.5 1320 0.0352 7.4 <0.5 0.0768 <0.5 13.9 <0.5 2.3 1.5 1971 Ash Basin Soil Samples - Closure Samples 71B-03 (0-0.5) 0 - 0.5 06/19/2019 4 30 j 4 j <1 <20 1.3 j 2200 <5 4.4 j <40 <5 <5 4.2 j 55 <1 44 71B-03 (2-2.5) 2 - 2.5 06/19/2019 2.3 <50 2.3 j <1 <20 <5 1000 <5 2.2 j <40 <5 <5 2.5 j 35 0.43 j 25 71B-06 (0-0.5) 0 - 0.5 06/19/2019 6.1 <50 2.8 j <1 <20 <5 2100 <5 5.3 j <40 <5 <5 2.4 j 63 <1 33 71B-06 (2-2.5) 2 - 2.5 06/19/2019 3 29 j 2 j 0.21 j <20 <5 760 <5 2.5 j <40 <5 3.5 j 3.4 j 57 0.76 j 17 71B-08 (0-0.5) 0 - 0.5 06/19/2019 <2 25 j <5 <1 <20 <5 150 <5 <15 <40 <5 1.9 j 3 j 9.4 j 0.45 j <5 71B-08 (2-2.5) 2 - 2.5 06/19/2019 <2 <50 1.9 j <1 <20 <5 380 <5 2 j <40 <5 3.5 j 1.3 j 67 2.7 27 1984 Ash Basin Soil Samples - Closure Samples 84B-002 (0-0.5) 0 - 0.5 06/07/2019 7.2 51 5.1 0.21 j <20 <5 9800 1 j 5.6 j 6 j 1.2 j 2.4 j 3.1 j 81 5.9 34 84B-002 (2-2.5) 2 - 2.5 06/07/2019 7.9 <50 3.2 j 0.29 j <20 <5 5100 <5 9.5 j 9.7 j <5 4.9 j 2.2 j 81 0.39 j 5.4 84B-007 (0-0.5) 0 - 0.5 06/07/2019 13 53 2.7 j 0.22 j <20 2.7 j 20000 1.9 j 31 5.4 j 2.8 j 1.5 j 3.4 j 76 4.9 71 84B-007 (2-2.5) 2 - 2.5 06/07/2019 3.2 <50 0.88 j <1 <20 <5 6700 <5 8 j 7.4 j <5 <5 2.3 j 17 1.1 12 84B-011 (0-0.5) 0 - 0.5 06/07/2019 <2 70 1.4 j 0.46 j <20 <5 77 j <5 1.9 j <40 1.1 j <5 3.5 j 41 6.9 <5 84B-011 (2-2.5) 2 - 2.5 06/07/2019 2.2 <50 0.81 j <1 <20 <5 730 <5 1.9 j <40 <5 <5 3.1 j 20 1.6 <5 84B-022 (0-0.5) 0 - 0.5 06/07/2019 <2 31 j 0.88 j 0.79 j <20 <5 790 <5 11 j <40 1.1 j <5 3.3 j 15 7 5 84B-022 (2-2.5) 2 - 2.5 06/07/2019 <2 <50 2.7 j 0.27 j <20 <5 47 j <5 17 <40 <5 <5 0.85 j 46 14 <5 84B-024 (0-0.5) 0 - 0.5 06/07/2019 1.7 j 47 j 1.8 j 0.68 j <20 <5 6900 1.2 j 13 j <40 3.1 j <5 3.5 j 54 6.1 35 84B-024 (2-2.5) 2 - 2.5 06/07/2019 <2 <50 7.3 0.48 j <20 2.6 j 83 j <5 3.3 j <40 <5 <5 1.6 j 170 29 <5 84B-026 (0-0.5) 0 - 0.5 06/07/2019 <2 34 j 1.2 j 0.28 j <20 <5 2200 <5 8.6 j <40 1.4 j <5 1.9 j 21 6.5 9.4 84B-026 (2-2.5) 2 - 2.5 06/07/2019 <2 27 j 0.78 j 0.28 j <20 1.3 j 71 j <5 2.6 j <40 <5 <5 1.3 j 17 4.3 <5 84B-028 (0-0.5) 0 - 0.5 06/07/2019 <2 29 j 19 0.4 j <20 <5 290 0.72 j <15 15 j 0.94 j 4.5 j 1.5 j 110 4.5 2.5 j 846-028 (2-2.5) 2 - 2.5 06/07/2019 <2 <50 2.3 j <1 <20 <5 130 <5 12 j <40 <5 <5 0.87 j 12 4.2 <5 84B-030 (0-0.5) 0 - 0.5 06/07/2019 <2 56 7.4 0.56 j <20 <5 56 j 1.7 j 20 <40 3.6 j <5 2.5 j 260 31 <5 84B-030 (2-2.5) 2 - 2.5 06/07/2019 1.8 j 34 j 17 <1 <20 <5 1400 <5 <15 6.5 j <5 1.3 j 2.6 j 90 6.6 6.1 84B-136 (0-0.5) 0 - 0.5 06/03/2019 48 180 6 1 <20 2.4 j 24000 2.2 j 17 140 3.8 j 7.3 4 j 320 7.6 100 84B-042 (0-0.5) 0 - 0.5 06/07/2019 4.9 49 j 3.5 j <1 <20 <5 1400 0.74 j 2.9 j 13 j 1.4 j <5 4.9 j 87 8.2 9.2 84B-042 (2-2.5) 2 - 2.5 06/07/2019 1.6 j 21 j 2.4 j 0.29 j <20 <5 580 <5 3.4 j <40 <5 <5 2.6 j 47 3.6 3.4 j 84B-044 (0-0.5) 0 - 0.5 06/07/2019 <2 29 j 4.9 j 0.42 j <20 <5 <100 0.65 j 5.6 j <40 1.3 j <5 2 j 86 6.2 <5 84B-044 (2-2.5) 2 - 2.5 06/07/2019 <2 <50 2.5 j 0.48 j <20 <5 <100 <5 6.2 j <40 <5 <5 1.4 j 55 6.5 <5 84B-140 (2-2.5) 2 - 2.5 07/01/2019 <2 32 j 1.5 j <1 <20 <5 3100 <5 9.5 j 10 j 0.63 j <5 2.8 j 42 1 9.3 846-046 (0-0.5) 0 - 0.5 06/07/2019 <2 43 j 1.3 j 1.2 <20 <5 260 <5 3.1 j <40 1.7 j <5 2.6 j 38 8.1 <5 84B-046 (2-2.5) 2 - 2.5 06/07/2019 <2 <50 0.77 j 0.21 j <20 <5 <100 <5 2.9 j <40 <5 <5 0.9 j 20 1.7 <5 846-049 (0-0.5) 0 - 0.5 06/07/2019 <2 26 j 7.9 0.44 j <20 <5 <100 <5 <15 6.8 j <5 <5 1.3 j 47 2.3 <5 84B-049 (2-2.5) 2 - 2.5 06/07/2019 <2 140 1.5 j 0.64 j <20 <5 49 j <5 5.5 j <40 1.5 j <5 4.9 j 54 7 <5 84B-051 (0-0.5) 0 - 0.5 06/06/2019 <2 99 2.9 j 0.47 j <20 <5 <100 <5 4.9 j <40 2.7 j <5 3.2 j 130 4.2 <5 84B-051 (2-2.5) 2 - 2.5 06/06/2019 <2 28 j 2.9 j 0.22 j <20 <5 43 j <5 17 <40 <5 <5 1.3 j 91 18 <5 84B-064 (0-0.5) 0 - 0.5 06/06/2019 42 75 5 0.54 j <20 3.1 j 40000 2.8 j 30 45 3.7 j 2.3 j 6.6 170 4.9 150 84B-064 (2-2.5) 2 - 2.5 06/06/2019 1.5 j <50 1.9 j 0.31 j <20 7.3 76 j <5 6.8 j <40 <5 <5 0.78 j 63 29 <5 84B-066 (0-0.5) 0 - 0.5 06/06/2019 15 80 5.6 0.25 j <20 3.3 j 39000 3 j 34 20 j 3.8 j 1.4 j 7.4 200 3.3 160 84B-066 (2-2.5) 2 - 2.5 06/06/2019 <2 <50 <5 0.26 j <20 <5 <100 <5 <15 <40 <5 <5 0.96 j 16 3.9 <5 84B-068 (0-0.5) 0 - 0.5 06/06/2019 7.4 42 j 4.1 j 0.43 j <20 53 22000 2.5 j 130 <40 3.5 j 1.7 j 6 100 17 150 84B-068 (2-2.5) 2 - 2.5 06/06/2019 2.8 280 0.9 j <1 <20 3.4 j 2400 <5 14 j <40 <5 <5 18 12 2.4 15 84B-069 (0-0.5) 0 - 0.5 06/19/2019 22 61 4.8 j <1 <20 2.2 j 1 37000 2 j 20 17 j 2.5 j 1.9 j 1.2 j 140 5.4 96 Page 1 of 6 TABLE 5-3B SUMMARY OF UNSATURATED SOIL SPLP - SOURCE AREA 1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Iron Magnesium Manganese Molybdenum Potassium Selenium Sodium Strontium Sulfate Vanadium Reporting Units Ng/L Ng/L mg/L mg/L Ng/L Ng/L Ng/L mg/L Ng/L Ng/L mg/L Ng/L mg/L Ng/L mg/L Ng/L 15A NCAC 02L Standard 30 700 NE 250 10 1* 300 NE 50 NE NE 20 NE NE 250 0.3* Sample ID Depth Interval (FEET BGS) Sample Collection Date SPLP Results 1984 Ash Basin Soil Samples - Closure Samples (Continued) 84B-069 (2-2.5) 2 - 2.5 06/19/2019 6.5 29 j 2.6 j <1 <20 <5 3400 <5 4.1 j 11 j <5 <5 2.4 j 41 3 13 84B-071 (0-0.5) 0 - 0.5 06/06/2019 <2 87 3.4 j 0.7 j <20 <5 <100 0.66 j 8.3 j <40 2.1 j <5 2.9 j 170 14 <5 84B-071 (2-2.5) 2 - 2.5 06/06/2019 <2 29 j 4.5 j 0.26 j <20 3.5 j 83 j <5 34 <40 <5 <5 0.82 j 200 50 <5 84B-073 (0-0.5) 0 - 0.5 06/06/2019 <2 56 1.6 j 0.68 j <20 <5 <100 <5 5 j <40 1.4 j <5 1.5 j 68 6.6 <5 84B-073 (2-2.5) 2 - 2.5 06/06/2019 <2 21 j 1.1 j 0.67 j <20 <5 54 j <5 6.3 j <40 <5 <5 1.5 j 45 7.6 <5 84B-086 (0-0.5) 0 - 0.5 06/06/2019 <2 39 j 1.2 j 0.76 j <20 <5 81 j <5 <15 <40 1.5 j <5 1.9 j 47 4.6 <5 84B-086 (2-2.5) 2 - 2.5 06/06/2019 <2 <50 1.5 j 0.46 j <20 <5 <100 <5 3.7 j <40 <5 <5 1.3 j 70 7.1 <5 84B-088 (0-0.5) 0 - 0.5 06/06/2019 7.2 60 1.4 j 0.56 j <20 <5 4200 <5 4.1 j 5.2 j 1.4 j <5 6.3 30 5 18 84B-088 (2-2.5) 2 - 2.5 06/06/2019 <2 20 j 2 j 0.81 j <20 3.6 j 62 j <5 7.7 j <40 <5 <5 2.1 j 69 15 <5 84B-091 (0-0.5) 0 - 0.5 06/07/2019 2.6 44 j 2.3 j 0.24 j <20 <5 4000 <5 4.7 j <40 1.1 j <5 1.2 j 64 5.3 11 84B-091 (2-2.5) 2 - 2.5 06/07/2019 2.7 20 j 1.9 j <1 <20 <5 5900 0.84 j 11 j 8.7 j <5 1.7 j 1.4 j 29 1.1 18 846-093 (0-0.5) 0 - 0.5 06/07/2019 <2 190 1.7 j 0.61 j <20 <5 63 j <5 3.4 j <40 1.2 j <5 2.3 j 82 7.9 <5 84B-093 (2-2.5) 2 - 2.5 06/07/2019 <2 43 j 1.1 j 0.31 j <20 4.6 j 100 <5 3.3 j <40 <5 <5 0.93 j 51 21 <5 84B-095 (0-0.5) 0 - 0.5 06/07/2019 3.2 190 2.9 j 0.79 j <20 <5 2700 0.73 j 3.8 j 99 1.3 j <5 2.1 j 170 7.5 16 84B-095 (2-2.5) 2 - 2.5 06/07/2019 1.5 j 41 j 1.9 j 0.38 j <20 <5 1900 <5 2.2 j 19 j <5 <5 2.6 j 75 0.6 j 3.2 j 84B-109 (0-0.5) 0 - 0.5 06/06/2019 <2 96 1.9 j 0.58 j <20 <5 63 j <5 3.3 j <40 1.2 j <5 2.3 j 110 9.8 <5 84B-109 (2-2.5) 2 - 2.5 06/06/2019 <2 <50 <5 <1 <20 <5 68 j <5 <15 <40 <5 <5 0.65 j 28 4.7 <5 84B-111 (0-0.5) 0 - 0.5 06/06/2019 <2 71 0.77 j 0.29 j <20 <5 94 j <5 <15 <40 1.3 j <5 1.6 j 37 5 <5 84B-111 (2-2.5) 2 - 2.5 06/06/2019 <2 35 j 13 <1 <20 18 950 0.88 j 55 <40 <5 <5 0.77 j 590 98 <5 84B-113 (0-0.5) 0 - 0.5 06/06/2019 24 75 4.8 j 0.24 j <20 4.7 j 39000 2.4 j 42 7 j 3 j 6.2 5 120 9.2 130 84B-113 (2-2.5) 2 - 2.5 06/06/2019 310 29 j 6.8 <1 <20 <5 7700 0.63 j 36 19 j <5 19 3.5 j 310 2 85 84B-115 (0-0.5) 0 - 0.5 06/05/2019 85 120 10 <1 <20 7.1 76000 7.3 82 82 8.5 3.9 j 2.7 j 390 1.5 250 84B-115 (2-2.5) 2 - 2.5 06/05/2019 <2 <50 0.66 j <1 <20 <5 99 j <5 <15 9.5 j <5 <5 1.4 j 15 <1 <5 84B-117R (0-0.5) 0 - 0.5 08/21/2019 37 230 11 1 <20 8.9 90000 10 110 41 11 2.9 j 7.8 500 1.8 290 84B-117R (2-2.5) 2 - 2.5 08/21/2019 1.4 j 40 j <5 0.58 j <20 <5 1300 <5 3.5 j 13 j <5 <5 2.1 j 15 <1 3.6 j 84B-119 (0-0.5) 0 - 0.5 06/06/2019 28 190 8.2 0.52 j <20 6.4 40000 4.2 j 50 45 6.2 4.3 j 5.8 440 10 190 84B-119 (2-2.5) 2 - 2.5 06/06/2019 21 60 3.1 j <1 <20 1.7 j 6200 0.88 j 16 140 1.2 j 3.1 j 2.1 j 190 2.1 30 84B-134 (0-0.5) 0 - 0.5 06/03/2019 44 310 9.3 0.45 j <20 4.7 j 34000 3.1 j 38 150 7.1 9.4 3.9 j 440 8.5 130 84B-134 (2-2.5) 2 - 2.5 06/03/2019 5.7 45 j 0.93 j <1 <20 <5 540 <5 <15 50 <5 <5 4.4 j 26 1.4 6 84B-136 (2-2.5) 2 - 2.5 06/03/2019 <2 100 5.6 0.56 j <20 1.8 j <100 <5 5.9 j <40 <5 <5 4.3 j 270 13 2.6 j 84B-138 (0-0.5) 0 - 0.5 06/06/2019 2.5 150 2.1 j 0.82 j <20 <5 4500 0.66 j 4.1 j 6.8 j 2.4 j <5 3 j 96 7.4 13 84B-138 (2-2.5) 2 - 2.5 06/06/2019 1.9 j 20 j 1.1 j <1 <20 <5 4600 <5 6.4 j <40 <5 <5 1.6 j 36 1.8 9.2 84B-140 (0-0.5) 0 - 0.5 07/01/2019 47 24 j 8.5 <1 <20 1.8 j 17000 0.97 j 20 16 j 1.5 j 2.9 j <5 96 <1 63 84B-142 (0-0.5) 0 - 0.5 06/03/2019 10 210 6 0.88 j <20 <5 6000 2.1 j 13 j 13 j 1.9 j 7.6 5.5 200 10 34 84B-142 (2-2.5) 2 - 2.5 06/03/2019 <2 29 j 1.8 j <1 <20 <5 <100 <5 11 j 5.1 j <5 <5 0.81 j 88 1.2 <5 84B-144 (0-0.5) 0 - 0.5 06/03/2019 5.2 89 3.2 j 0.29 j <20 <5 3400 0.89 j 20 <40 1.6 j <5 3.9 j 100 8.1 20 84B-144 (2-2.5) 2 - 2.5 06/03/2019 1.8 j 27 j 0.89 j 0.21 j <20 <5 80 j <5 4.1 j <40 <5 <5 0.98 j 28 3.4 2.7 j 84B-146 (0-0.5) 0 - 0.5 06/03/2019 <2 110 2.5 j 0.65 j <20 <5 <100 <5 5.5 j <40 2.2 j <5 2.6 j 79 9.3 <5 84B-146 (2-2.5) 2 - 2.5 06/03/2019 <2 51 1.4 j 1.2 <20 <5 240 <5 3.2 j <40 <5 <5 3.2 j 41 3.6 2.9 j 84B-162 (0-0.5) 0 - 0.5 06/04/2019 2.6 140 4.4 j 0.42 j <20 <5 2600 0.8 j 16 <40 2 j <5 2.5 j 140 8.1 7.8 84B-162 (2-2.5) 2 - 2.5 06/04/2019 3.3 38 j 1.1 j <1 <20 <5 11000 <5 14 j <40 0.73 j <5 4 j 15 1 32 84B-164 (0-0.5) 0 - 0.5 06/03/2019 120 210 11 0.49 j <20 9.3 48000 5.1 54 150 6 6.2 3.2 j 640 11 190 84B-164 (2-2.5) 2 - 2.5 06/03/2019 30 65 4.1 j <1 <20 <5 960 <5 11 j 170 <5 <5 4.8 j 190 10 8.4 84B-166 (0-0.5) 0 - 0.5 06/03/2019 <2 250 1.1 j 0.7 j <20 <5 750 <5 2 j <40 1.4 j <5 5.4 36 5.2 2.5 j Page 2 of 6 TABLE 5-3B SUMMARY OF UNSATURATED SOIL SPLP - SOURCE AREA 1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Iron Magnesium Manganese Molybdenum Potassium Selenium Sodium Strontium Sulfate Vanadium Reporting Units Ng/L Ng/L mg/L mg/L Ng/L Ng/L Ng/L mg/L Ng/L Ng/L mg/L Ng/L mg/L Ng/L mg/L Ng/L 15A NCAC 02L Standard 30 700 NE 250 10 1* 300 NE 50 NE NE 20 NE NE 250 0.3* Sample ID Depth Interval (FEET BGS) Sample Collection Date SPLP Results 1984 Ash Basin Soil Samples - Closure Samples (Continued) 84B-166 (2-2.5) 2 - 2.5 06/03/2019 1.4 j 36 j 0.85 j 0.28 j <20 <5 900 <5 2 j 7 j <5 <5 2.9 j 19 <1 <5 84B-170 (0-0.5) 0 - 0.5 07/01/2019 <2 37 j 0.96 j <1 <20 <5 2000 <5 5.4 j <40 <5 <5 3.2 j 4.3 j <1 5.3 84B-170 (2-2.5) 2 - 2.5 07/01/2019 67 37 j 2.1 j <1 <20 2 j 13000 0.81 j 24 13 j 0.87 j 1.3 j 2.7 j 85 0.73 j 21 84B-172 (0-0.5) 0 - 0.5 07/08/2019 150 170 14 0.24 j <20 7.3 76000 7 84 160 7.7 7.8 1.1 j 520 4.9 280 84B-172 (2-2.5) 2 - 2.5 07/08/2019 47 36 j 1.8 j <1 <20 3.5 j 5400 0.93 j 15 92 1 j <5 <5 100 2.8 21 84B-174 (0-0.5) 0 -0.5 06/03/2019 3.9 150 1.8 j 1.1 <20 <5 4000 0.83 j 11 j <40 1.6 j <5 2.2 j 63 5.7 19 84B-174 (2-2.5) 2 - 2.5 06/03/2019 8 82 5.5 0.42 j <20 <5 2700 1 j 32 24 j <5 1.4 j 1.4 j 210 15 11 84B-176 (0-0.5) 0 - 0.5 06/03/2019 3.2 260 4.2 j 1.9 <20 <5 3100 1.5 j 17 <40 2.1 j <5 7.8 160 6.2 8.9 84B-176 (2-2.5) 2 - 2.5 06/03/2019 3.3 28 j 1.5 j <1 <20 <5 8000 0.84 j 18 <40 0.91 j <5 1.2 j 48 1.7 20 84B-184 (0-0.5) 0 - 0.5 06/03/2019 11 110 4.5 j 1 <20 5.5 17000 2.6 j 57 <40 3.1 j <5 5.2 160 15 81 84B-184 (2-2.5) 2 - 2.5 06/03/2019 2.4 23 j 0.89 j <1 <20 <5 2800 <5 13 j <40 <5 <5 1.5 j 26 1.1 12 84B-194 (0-0.5) 0 - 0.5 06/04/2019 6.9 150 8.8 0.66 j <20 <5 100 1.5 j 25 23 j 2.2 j 1.7 j 2.7 j 420 14 6.8 84B-194 (2-2.5) 2 - 2.5 06/04/2019 55 150 1 j <1 <20 <5 220 <5 2.2 j 270 <5 <5 6.8 62 3 4.2 j 84B-196 (0-0.5) 0 - 0.5 06/04/2019 <2 150 12 0.38 j <20 4 j <100 1.7 j 20 <40 4.6 j <5 1.8 j 640 33 <5 84B-196 (0-0.5) 0 - 0.5 06/07/2019 9.2 270 4.8 j 0.6 j <20 <5 6800 1 j 5.5 j 1400 3.7 j <5 3.8 j 250 11 31 84B-196 (2-2.5) 2 - 2.5 06/04/2019 1.3 j 48 j 4.3 j 0.22 j <20 2.8 j 230 <5 11 j 18 j <5 <5 0.63 j 250 14 <5 84B-196 (2-2.5) 2 - 2.5 06/07/2019 <2 100 7.3 0.23 j <20 5.9 200 0.85 j 20 <40 <5 <5 0.84 j 400 27 <5 84B-198 (0-0.5) 0 - 0.5 06/04/2019 32 240 6.5 2.6 <20 2.6 j 34000 2.4 j 23 78 4.1 j 5.2 4.1 j 380 9 120 84B-198 (0-0.5) 0 - 0.5 06/07/2019 120 270 9.6 0.78 j <20 5.2 73000 4.8 j 54 560 5.5 2 j 3.2 j 570 3 210 846-198 (2-2.5) 2- 2.5 06/04/2019 <2 100 6.7 0.34 j <20 6.8 840 <5 44 <40 <5 <5 2.2 j 260 32 <5 846-198 (2-2.5) 2 - 2.5 06/07/2019 <2 370 9.8 0.42 j <20 1.4 j 300 2.1 j 77 <40 <5 <5 6.3 230 30 <5 84B-203 (0-0.5) 0 - 0.5 07/09/2019 21 29 j 1.6 j <1 <20 1.3 j 9200 0.81 j 13 j 11 j 0.87 j 1.4 j 2.4 j 49 <1 42 84B-203 (2-2.5) 2 - 2.5 07/09/2019 19 26 j 1.2 j <1 <20 <5 3500 <5 6.1 j 7.4 j <5 <5 1.4 j 35 <1 12 84B-205 (0-0.5) 0 - 0.5 07/09/2019 85 78 5.1 <1 <20 4.3 j 49000 3.9 j 52 71 4.2 j 3 j 1.3 j 250 <1 170 84B-205 (2-2.5) 2 - 2.5 07/09/2019 24 36 j 1.5 j <1 <20 1.3 j 4500 <5 11 j 100 <5 1.8 j 1.2 j 76 <1 11 84B-207 (0-0.5) 0 - 0.5 06/05/2019 220 330 22 1.7 <20 8.8 160000 14 180 170 13 2.9 j 4 j 970 2.8 390 84B-207 (2-2.5) 2 - 2.5 06/05/2019 3.6 33 j 1.6 j 0.39 j <20 1.4 j 810 <5 9.9 j 5.9 j <5 <5 2.4 j 49 6.8 <5 84B-209 (0-0.5) 0 - 0.5 06/05/2019 440 370 22 2.7 <20 11 140000 14 210 290 14 7.3 6.8 1100 8.6 370 84B-209 (2-2.5) 2 - 2.5 06/05/2019 12 400 22 2.1 <20 1.9 j 140000 13 200 300 14 1.3 j 7.1 1100 0.58 j 95 84B-217 (0-0.5) 0 - 0.5 06/04/2019 29 110 5 0.71 j <20 3.1 j 19000 2.3 j 25 110 2.9 j 2.3 j 3 j 280 5.4 110 84B-217 (2-2.5) 2 - 2.5 06/04/2019 2 810 0.9 j 1.5 <20 <5 590 <5 2.4 j 5.3 j <5 <5 23 41 1.4 3.4 j 84B-229 (0-0.5) 0 - 0.5 06/05/2019 88 250 8.9 0.9 j <20 3.9 j 44000 4.3 j 50 100 5 5.1 5.5 410 6.8 230 84B-229 (2-2.5) 2 - 2.5 06/05/2019 9.8 480 2.4 j 0.69 j <20 <5 2100 <5 8.9 j 15 j 0.73 j 3.4 j 3.5 j 91 3 79 84B-231 (0-0.5) 0 - 0.5 06/04/2019 <2 130 2 j 0.76 j <20 <5 <100 <5 5.7 j <40 0.95 j <5 3.8 j 77 9 <5 84B-231 (2-2.5) 2 - 2.5 06/04/2019 <2 53 4.2 j <1 <20 2.7 j 43 j <5 20 <40 <5 <5 1.4 j 170 23 3 j 84B-233 (0-0.5) 0 - 0.5 06/04/2019 41 75 3.7 j <1 <20 2.4 j 19000 1.3 j 19 49 2.2 j 3.8 j 2.7 j 170 0.52 j 140 84B-233 (2-2.5) 2 - 2.5 06/04/2019 140 120 5.2 <1 <20 <5 8300 <5 7.8 j 640 <5 4 j 2.6 j 370 1.2 21 84B-237 (0-0.5) 0 - 0.5 07/11/2019 37 36 j 3.3 j <1 <20 1.9 j 22000 1.6 j 20 28 j 2 j 3.9 j 0.93 j 110 1.1 78 84B-237 (2-2.5) 2 - 2.5 07/11/2019 58 44 j 3.5 j <1 <20 <5 4700 <5 8.6 j 18 j <5 <5 0.89 j 130 <1 11 84B-239 (0-0.5) 0 - 0.5 07/11/2019 18 160 4.6 j 0.74 j <20 4.6 j 120000 3.9 j 42 <40 3.9 j <5 2.6 j 190 3 170 84B-239 (2-2.5) 2 - 2.5 07/11/2019 3.5 38 j 0.86 j <1 <20 <5 2200 <5 3.3 j <40 <5 <5 3.7 j 11 <1 3.3 j 84B-241 (0-0.5) 0 - 0.5 07/09/2019 85 130 8 0.54 j <20 4.3 j 45000 4.7 j 51 30 j 4.4 j 2 j 1.6 j 290 2.8 160 84B-241 (2-2.5) 2 - 2.5 07/09/2019 10 200 2.6 j 0.42 j <20 <5 2800 <5 5.5 j 8.9 j <5 <5 6.7 110 1.4 7.1 84B-243 (0-0.5) 0 - 0.5 06/05/2019 46 290 9.9 2.3 <20 5.2 92000 8.8 75 15 j 7.8 <5 4.3 j 450 4.2 1 190 Page 3 of 6 TABLE 5-3B SUMMARY OF UNSATURATED SOIL SPLP - SOURCE AREA 1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Iron Magnesium Manganese Molybdenum Potassium Selenium Sodium Strontium Sulfate Vanadium Reporting Units Ng/L Ng/L mg/L mg/L Ng/L Ng/L Ng/L mg/L Ng/L Ng/L mg/L Ng/L mg/L Ng/L mg/L Ng/L 15A NCAC 02L Standard 30 700 NE 250 10 1* 300 NE 50 NE NE 20 NE NE 250 0.3* Sample ID Depth Interval (FEET BGS) Sample Collection Date SPLP Results 1984 Ash Basin Soil Samples - Closure Samples (Continued) 84B-243 (2-2.5) 2 - 2.5 06/05/2019 1.5 j 35 j 1.1 j 0.78 j <20 <5 100 <5 4.2 j <40 <5 <5 1.5 j 39 2.3 <5 84B-245 (0-0.5) 0 - 0.5 06/05/2019 160 350 15 2.2 <20 7.2 98000 10 110 64 9.7 4.7 j 3.6 j 700 7.6 290 84B-245 (2-2.5) 2 - 2.5 06/05/2019 500 59 2.6 j 0.62 j <20 <5 1400 <5 7.5 j 500 <5 3.1 j 2.4 j 120 4.1 31 84B-253 (0-0.5) 0 - 0.5 06/05/2019 73 230 10 <1 <20 6.5 75000 5.3 65 98 6.9 2.4 j 4.5 j 550 3.7 200 84B-253 (2-2.5) 2 - 2.5 06/05/2019 2.5 38 j 0.83 j 0.59 j <20 <5 1700 <5 6.3 j <40 <5 <5 5.4 26 1.1 6.9 84B-264 (0-0.5) 0 - 0.5 06/06/2019 20 190 2.4 j 0.31 j <20 <5 14000 0.92 j 11 j 88 2.1 j <5 5.9 120 3.3 46 84B-264 (2-2.5) 2 - 2.5 06/06/2019 10 33 j 2.4 j <1 <20 1.3 j 390 <5 10 j 18 j <5 <5 0.83 j 130 15 <5 84B-266 (0-0.5) 0 - 0.5 06/06/2019 40 150 11 0.4 j <20 2 j 18000 2.3 j 18 120 1.8 j 39 7.3 320 9 140 84B-266 (2-2.5) 2 - 2.5 06/06/2019 <2 77 5.5 0.52 j <20 <5 510 0.83 j 65 <40 <5 <5 2.3 j 97 6.8 3.2 j 84B-268 (0-0.5) 0 - 0.5 06/05/2019 <2 250 3.7 j 0.64 j <20 <5 490 0.88 j 9.4 j 6.5 j 1.8 j <5 2.9 j 190 13 5.9 84B-268 (2-2.5) 2 - 2.5 06/05/2019 5.4 52 2.1 j 0.42 j <20 <5 5100 <5 9.9 j 33 j 0.81 j <5 3.7 j 87 1.4 15 84B-272 (0-0.5) 0 - 0.5 07/11/2019 170 150 4.4 j <1 <20 3.4 j 73000 3.1 j 39 93 4 j 1.5 j 3.1 j 220 3.7 170 84B-272 (2-2.5) 2 - 2.5 07/11/2019 9.3 44 j 0.77 j <1 <20 <5 1200 <5 2.8 j 7 j <5 <5 4.6 j 21 <1 <5 846-274 (0-0.5) 0 - 0.5 07/09/2019 <2 110 1.2 j 1.3 <20 <5 100 0.64 j 3.2 j <40 0.8 j <5 2.8 j 50 7.4 <5 84B-274 (2-2.5) 2 - 2.5 07/09/2019 5.8 33 j 1 j 0.24 j <20 <5 550 <5 <15 11 j <5 <5 1.8 j 33 <1 2.8 j 84B-276 (0-0.5) 0 - 0.5 07/09/2019 2.8 23 j 0.73 j <1 <20 <5 1700 <5 4.5 j <40 <5 <5 1.6 j 13 <1 5.4 846-276 (2-2.5) 2 - 2.5 07/09/2019 <2 26 j <5 0.28 j <20 <5 190 <5 <15 <40 <5 <5 1.7 j 10 0.49 j <5 84B-278 (0-0.5) 0 - 0.5 06/06/2019 280 190 15 0.25 j <20 7.6 110000 7.8 130 350 10 12 2.9 j 870 4.8 270 84B-278 (2-2.5) 2 - 2.5 06/06/2019 260 61 3.8 j 0.2 j <20 <5 9600 0.68 j 27 810 0.71 j 4.9 j 1.8 j 220 4.7 40 84B-280 (0-0.5) 0 - 0.5 06/06/2019 300 340 18 0.64 j <20 12 j 120000 10 100 330 12 4.2 j 5 840 6.8 410 84B-280 (2-2.5) 2 - 2.5 06/06/2019 10 56 1.9 j 0.53 j <20 <5 1100 <5 8.6 j 7 j <5 <5 2.2 j 60 10 6.3 84B-303 (0-0.5) 0 - 0.5 06/06/2019 19 140 5.5 0.23 <20 2.1 j 15000 2 j 26 12 j 2.4 j 3 j 5.5 210 11 56 84B-303 (2-2.5) 2 - 2.5 06/06/2019 61 35 j 8.6 <1 <20 <5 320 <5 <15 170 <5 68 1.6 j 130 3.3 52 84B-307 (0-0.5) 0 - 0.5 07/11/2019 41 45 j 2.6 j <1 <20 1.3 j 17000 1.3 j 21 39 j 1.7 j 1.3 j 0.94 j 110 0.53 j 50 84B-307 (2-2.5) 2 - 2.5 07/11/2019 54 37 j 2.1 j <1 <20 <5 3900 <5 8.2 j 21 j <5 <5 3.7 j 85 <1 9.3 84B-309 (0-0.5) 0 - 0.5 07/10/2019 21 150 4.6 j 0.22 j <20 4.1 j 43000 3.3 j 43 11 j 3.4 j 1.6 j 2.9 j 200 1.2 130 84B-309 (2-2.5) 2 - 2.5 07/10/2019 8.1 350 0.97 j <1 <20 <5 730 <5 <15 34 j <5 <5 14 27 <1 3.1 j 84B-311 (0-0.5) 0 - 0.5 07/10/2019 40 70 4.6 j <1 <20 3.1 j 24000 1.9 j 26 34 j 2.4 j 5.5 1.6 j 150 2.8 140 84B-311 (2-2.5) 2 - 2.5 07/10/2019 11 42 j 1.4 j <1 <20 1 <5 4900 <5 4.7 j 17 j <5 2 j 1.9 j 39 0.22 j 24 84B-328 (0-0.5) 0 - 0.5 07/08/2019 17 180 7.5 0.24 j <20 6.4 71000 4.4 j 71 <40 4.2 j 1.4 j 1.5 j 300 4.4 240 84B-328 (2-2.5) 2 - 2.5 07/08/2019 140 89 6.1 <1 <20 <5 4000 <5 18 60 <5 <5 <5 290 2.5 2.8 j 84B-330 (0-0.5) 0 - 0.5 07/08/2019 78 130 7.1 <1 <20 4.9 j 67000 4.1 j 43 120 4 j <5 0.82 j 330 5.7 160 84B-330 (2-2.5) 2 - 2.5 07/08/2019 18 <50 1.4 j <1 <20 1.5 j 3600 <5 5.6 j 17 j <5 <5 0.68 j 72 1.8 12 84B-332 (0-0.5) 0 - 0.5 07/08/2019 93 180 9.5 0.37 j <20 5.3 74000 5 59 120 5.5 6.7 1.1 j 440 10 220 84B-332 (2-2.5) 2 - 2.5 07/08/2019 26 24 j 1.2 j <1 <20 <5 4600 <5 20 21 j <5 <5 0.99 j 83 2.3 10 84B-342 (0-0.5) 0 - 0.5 07/03/2019 2.8 64 1.8 j <1 <20 1.6 j 20000 2 j 27 <40 2.9 j <5 2.2 j 50 5.6 52 84B-342 (2-2.5) 2 - 2.5 07/03/2019 58 25 j 1.2 j <1 <20 <5 1500 <5 <15 7.2 j <5 <5 2.1 j 38 1.4 5.3 84B-344 (0-0.5) 0 - 0.5 07/03/2019 41 110 7.4 <1 <20 2.3 j 31000 <5 25 47 6.8 3 j 13 260 6.1 100 84B-344 (2-2.5) 2 - 2.5 07/03/2019 130 79 6.6 <1 <20 1.8 j 3600 0.95 j 36 260 0.81 j 2 j 2.3 j 370 2.4 6.1 84B-346 (0-0.5) 0 - 0.5 07/03/2019 12 35 j 1.6 j <1 <20 <5 7200 <5 6.3 j 7.4 j 0.68 j 1.5 j 2.9 j 50 1 52 84B-346 (2-2.5) 2 - 2.5 07/03/2019 7.5 35 j 1.1 j <1 <20 <5 1800 <5 2.5 j 10 j <5 7.3 4.6 j 27 1.1 42 84B-354 (0-0.5) 0 - 0.5 07/03/2019 37 98 6.2 <1 <20 3.2 j 35000 2.9 j 24 82 3.5 j 3.5 j 1.3 j 200 4.7 130 84B-354 (2-2.5) 2 - 2.5 07/03/2019 6.7 26 j 1.2 j <1 <20 <5 1400 <5 <15 <40 <5 1.5 j 2.1 j 32 1.6 14 84B-356 (0-0.5) 0 - 0.5 07/03/2019 38 69 3.5 j <1 <20 1.3 j 13000 1.3 j 9 j 24 j 2 j 46 2 j 160 7.5 120 Page 4 of 6 TABLE 5-3B SUMMARY OF UNSATURATED SOIL SPLP - SOURCE AREA 1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Iron Magnesium Manganese Molybdenum Potassium Selenium Sodium Strontium Sulfate Vanadium Reporting Units Ng/L Ng/L mg/L mg/L Ng/L Ng/L Ng/L mg/L Ng/L Ng/L mg/L Ng/L mg/L Ng/L mg/L Ng/L 15A NCAC 02L Standard 30 700 NE 250 10 1* 300 NE 50 NE NE 20 NE NE 250 0.3* Sample ID Depth Interval (FEET BGS) Sample Collection Date SPLP Results 1984 Ash Basin Soil Samples - Closure Samples (Continued) 84B-356 (2-2.5) 2 - 2.5 07/03/2019 35 64 6.6 <1 <20 <5 6200 1.1 j 14 j 62 1.2 j 3.7 j 1.9 j 350 4.4 36 84B-364 (0-0.5) 0 - 0.5 07/03/2019 2.3 81 13 0.24 j <20 <5 11000 2.7 j 22 <40 2.7 j 3.5 j 2.1 j 150 6.8 34 84B-364 (2-2.5) 2 - 2.5 07/03/2019 1.7 j 41 j 1.4 j <1 <20 <5 1500 <5 2.5 j 13 j <5 <5 3 j 31 1.6 6 84B-366 (0-0.5) 0 - 0.5 07/03/2019 21 28 j 1.8 j <1 <20 <5 7500 <5 8.9 j 11 j 0.95 j 2.7 j 1.9 j 67 1.5 45 84B-366 (2-2.5) 2 - 2.5 07/03/2019 22 26 j 2 j <1 <20 1.8 j 81 j <5 7.1 j 310 <5 <5 2.2 j 150 8.9 5.7 84B-367 (0-0.5) 0 - 0.5 07/03/2019 1.3 j 77 3.3 j 0.3 j <20 1.5 j 14000 2.3 j 19 <40 4.1 j <5 2.9 j 83 6.5 48 84B-367 (2-2.5) 2 - 2.5 07/03/2019 7.6 22 j 1.2 j <1 <20 <5 3300 <5 8 j <40 0.78 j <5 1.5 j 33 1.2 88 84B-373 (0-0.5) 0 - 0.5 07/01/2019 <2 75 1.4 j <1 <20 <5 <100 <5 <15 <40 1.9 j <5 1.3 j 43 5 <5 84B-373 (2-2.5) 2 - 2.5 07/01/2019 25 78 2.4 j <1 <20 1.3 j 4300 1.2 j 12 j 10 j 1.5 j <5 2.6 j 72 0.21 j 55 Former Process Area Soil Samples - Southeast of 1971 Ash Basin - FPA Assessment Samples FPA-01SB (10-12) 10- 12 07/16/2019 <2 20 j 3.9 j <1 NA 2.1 j <100 <5 20 <40 <5 1.7 j 2.6 j 280 9.7 16 FPA-01SB (14-16) 14- 16 07/16/2019 15 <50 2.4 j <1 NA 1.3 j 2400 <5 13 j <40 0.74 j <5 1.7 j 100 4.3 1600 FPA-02SB (4-6) 4 - 6 07/17/2019 <2 <50 0.74 j <1 NA <5 1100 <5 7 j <40 <5 <5 3.7 j 2.8 j 0.57 j 74 FPA-03SB (1-2) 1 -2 07/15/2019 14 <50 2 j <1 NA 1.3 j 3600 <5 18 <40 <5 <5 4 j 9.9 j 0.6 j 23 FPA-03SB (2-4) 2-4 07/15/2019 4 <50 1.6 j <1 NA <5 8600 <5 19 <40 <5 <5 2.6 j 18 0.58 j 32 FPA-05SB (9-11) 9 - 11 07/16/2019 4.2 <50 9.7 <1 NA <5 6400 <5 9.5 j <40 <5 <5 1.3 j 36 1.9 260 FPA-05SB (12-14) 12- 14 07/16/2019 21 <50 1.9 j <1 NA 1.4 j 8500 <5 9.4 j <40 <5 1.5 j 0.74 j 31 1.3 460 FPA-06SB (8-10) 8 - 10 07/16/2019 9.5 <50 12 <1 NA <5 280 <5 <15 7.4 j <5 2.5 j 1.4 j 49 4.6 530 FPA-06SB (10-12) 10 - 12 07/16/2019 3.4 <50 3.4 j <1 NA <5 8400 <5 37 6.5 j <5 <5 3.2 j 22 1.4 200 FPA-07SB (10-12) 10 -12 07/16/2019 <2 24 j 5.3 <1 NA <5 5800 <5 52 16 j 1.1 j <5 3.6 j 11 3.7 3.5 j FPA-08SB (1-2) 1 -2 07/16/2019 38 <50 1.4 j <1 NA <5 1200 <5 6.9 j <40 1.1 j 2.9 j 1.4 j 67 2 310 FPA-08SB (2-4) 2-4 07/16/2019 28 31 j 1.3 j <1 NA <5 <100 <5 <15 <40 <5 3.9 j 3.3 j 49 1.9 330 FPA-08SB (4-6) 4-6 07/16/2019 13 27 j 2 j <1 NA <5 340 <5 2.7 j <40 <5 1.3 j 4.5 j 58 2 300 FPA-08SB (6-8) 6 - 8 07/16/2019 1.6 j <50 <5 <1 NA <5 260 <5 <15 <40 <5 <5 2.5 j 9 j 0.34 j 29 Former Process Area Soil Samples - Southeast of 1971 Ash Basin - FPA Closure Samples FPA-01 (0-0.5) 0 - 0.5 02/27/2020 <2 37 j 1.5 j <1 <20 <5 1500 <5 9.3 j <40 <5 <5 5.4 3.7 j 0.33 j 20 FPA-01 (2-2.5) 2 - 2.5 02/27/2020 <2 47 j 0.93 j <1 <20 <5 2200 <5 3.4 j <40 <5 <5 6.9 2.5 j <1 9.4 FPA-01 (7-7.5) 7- 7.5 02/27/2020 <2 35 j 1.7 j <1 <20 <5 530 <5 <15 <40 <5 <5 6.1 4.6 j 0.26 j 270 FPA-01 (12-12.5) 12 - 12.5 02/27/2020 <2 <50 0.9 j <1 <20 <5 58 j <5 <15 <40 <5 <5 1.2 j 7.6 j 1.4 31 FPA-02 (0-0.5) 0- 0.5 02/27/2020 29 29 j 2.9 j <1 <20 <5 <100 <5 <15 7 j <5 2.6 j 3.4 j 170 1.9 180 FPA-02 (0-6) 0-6 03/12/2020 <2 44 j 3.9 j <1 <20 <5 2200 <5 11 j <40 <5 <5 7.6 15 0.98 j 13 FPA-02R (0-6) 0-6 03/31/2020 11 65 6.9 <1 <20 1.8 j 9600 0.76 j 26 7.2 j 1 j <5 15 37 1.1 39 FPA-02 (2-2.5) 2 - 2.5 02/27/2020 14 26 j 1.9 j <1 <20 <5 <100 <5 <15 6.3 j <5 1.5 j 1.5 j 160 2 81 FPA-02 (7-7.5) 7 - 7.5 02/27/2020 1.8 j <50 4.8 j <1 <20 <5 66 j <5 <15 <40 <5 <5 1.7 j 43 0.23 j 6.4 FPA-02 (12-12.5) 12 - 12.5 02/27/2020 2.1 79 3.9 j 0.21 j <20 <5 1500 <5 3.1 j 7.7 j <5 9.1 9.5 35 0.36 j 7000 FPA-02 (24-30) 24 - 30 03/12/2020 28 59 9.6 0.42 j <20 1.3 j 640 <5 13 j 5.7 j 3 j 4.1 j 7.7 130 2.4 180 FPA-02R (24-30) 24 - 30 03/31/2020 9.1 50 12 <1 <20 <5 4900 <5 15 10 j <5 2.2 j 15 55 1.5 24 FPA-03 (0-0.5) 0 - 0.5 02/27/2020 <2 33 j 11 <1 <20 <5 870 <5 2.5 j <40 <5 <5 8.6 60 0.22 j 120 FPA-03 (2-2.5) 2 - 2.5 02/27/2020 <2 44 j 2.6 j <1 <20 <5 1500 <5 5.4 j <40 <5 <5 8.1 10 0.72 j 22 FPA-03 (7-7.5) 7 - 7.5 02/27/2020 <2 27 j 2.6 j <1 <20 <5 150 <5 <15 <40 <5 <5 5.2 15 2.2 120 FPA-04 (0-0.5) 0 - 0.5 02/27/2020 3.6 22 j 12 0.4 j <20 <5 420 <5 <15 <40 <5 <5 5.8 34 1.8 120 FPA-04 (2-2.5) 2 - 2.5 02/27/2020 <2 26 j 3.4 j <1 <20 <5 620 <5 <15 <40 <5 <5 5.7 9.9 j 1.6 180 FPA-04 (7-7.5) 7 - 7.5 02/27/2020 1.6 j 67 2.7 j <1 <20 <5 8200 <5 13 j 5.6 j <5 <5 13 10 3.3 490 FPA-04 (12-12.5) 12 - 12.5 02/27/2020 <2 29 j 1.4 j <1 <20 <5 270 <5 <15 <40 <5 <5 5.5 4.6 j 1.4 86 Page 5 of 6 TABLE 5-3B SUMMARY OF UNSATURATED SOIL SPLP - SOURCE AREA 1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Iron Magnesium Manganese Molybdenum Potassium Selenium Sodium Strontium Sulfate Vanadium Reporting Units Ng/L Ng/L mg/L mg/L Ng/L Ng/L Ng/L mg/L Ng/L Ng/L mg/L Ng/L mg/L Ng/L mg/L Ng/L 15A NCAC 02L Standard 30 700 NE 250 10 1* 300 NE 50 NE NE 20 NE NE 250 0.3* Sample ID Depth Interval (FEET BGS) Sample Collection Date SPLP Results Former Process Area Soil Samples - Southeast of 1971 Ash Basin - FPA Closure Samples (Continued) FPA-05 (0-0.5) 0 - 0.5 02/27/2020 <2 29 j 0.73 j <1 <20 <5 150 <5 <15 <40 <5 <5 2.9 j 5.1 j 1.4 69 FPA-05 (2-2.5) 2 - 2.5 02/27/2020 <2 25 j 1.2 j <1 <20 <5 250 <5 <15 <40 <5 <5 2.8 j 8 j 1.8 140 FPA-05 (7-7.5) 7 - 7.5 02/27/2020 <2 <50 1.2 j <1 <20 <5 59 j <5 <15 <40 <5 <5 1.1 j 12 1.5 47 FPA-05 (12-12.5) 12- 12.5 02/27/2020 9.1 <50 11 <1 <20 <5 720 <5 110 <40 <5 <5 4.5 j 50 1.6 Soo FPA-06 (0-0.5) 0 - 0.5 02/27/2020 <2 21 j 21 0.25 j <20 <5 400 <5 <15 <40 <5 1.6 j 5.5 46 22 3.2 j FPA-06 (2-2.5) 2 - 2.5 02/27/2020 <2 35 j 5.4 <1 <20 <5 7500 <5 4.2 j <40 <5 <5 6.8 13 6.2 18 FPA-06 (7-7.5) 7 - 7.5 02/27/2020 <2 <50 2.4 j <1 <20 <5 <100 <5 6.8 j <40 <5 <5 <5 6.8 j 5.9 <5 FPA-06 (12-12.5) 12 - 12.5 02/27/2020 <2 33 j 0.85 j <1 <20 <5 48 j <5 <15 <40 <5 <5 3.5 j 3.1 j 2.9 <5 Downgradient of 1971 and 1984 Ash Basins AW-08C (0-2) 0 - 2 02/03/2015 <0.5 46.7 0.132 <5.3 NA <0.5 189 0.026 0.85 <0.5 <0.05 <0.5 3.26 <0.5 1.4 j 2.5 AW-09C (2-4) 2 1-4 02/03/2015 <0.5 7 0.778 <5.3 NA <0.5 68.6 0.0329 <0.5 <0.5 <0.05 <0.5 1.91 2.9 1.5 j <1 Notes: 0 - Bold highlighted concentration indicates exceedance of the 15 NCAC 02L Standard for Groundwater < - Concentration not detected at or above the adjusted reporting limit. * Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013. BGS - below ground surface j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit. mg/L - milligrams per liter NCAC - North Carolina Administrative Code NE - not established SPLP - Synthetic Precipitation Leaching Procedure S.U. - standard units pg/L - micrograms per liter Prepared by: BER Checked by: WJW Page 6 of 6 TABLE 5-4 SUMMARY OF CENTRAL TENDENCY AND LOWER CONFIDENCE LIMIT ANALYSIS RESULTS - SA1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter (2018 CSA Update COI List) pH Arsenic Boron Chloride Hexavalent Chromium Iron Manganese Selenium Sulfate Total Dissolved Solids Cobalt Vanadium Alkalinity Calcium Fluoride Lithium Magnesium Molybdenum Potassium Sodium Strontium Reporting Units S.U. pg/L pg/L mg/L pg/L pg/L pg/L pg/L mg/L mg/L pg/L pg/L mg/L mg/L mg/L pg/L mg/L pg/L mg/L mg/L pg/L 15A NCAC 02L Standard 6.5-8.5 10 700 250 10 300 50 20 250 500 1* 0.3* NE NE 2 NE NE NE NE NE NE 2018 Background Threshold Values (Upper Surficial Flow Zone)' 6.5 - 8.5 1 50 5 0.03 468 43 1 16 25 0.9 0.3 5 0.9 NE NE 0.5 1 0.7 3 8 2020 Background Threshold Values (Upper Surficial Flow Zone)Z 4.1 - 7.3 1 2 50 6 1 0.06 1 6270 1 113 1 1 15 64 3 2 20 1 8.12 0.2 5 1 0.5 1 1 0.8 1 3 71 2018 Background Threshold Values (Lower Surficial Flow Zone)' 4.1 - 5.1 3 50 18 1 0.1 1 9540 1 470 1 1 1 19 110 1 3 1 1 68 1 18 1 NE I NE 1 3 1 1 1 0.5 1 13 1 45 2020 Background Threshold Values (Lower Surficial Flow Zone)Z 5.1 - 7.3 14 50 1 30 1 0.1 1 28300 744 1 1 1 22 880 1 7 1 2 1 165 1 68 1 0.5 1 5 1 3 1 1 1 5 1 13 1 167 Sample ID Flow Zone Lower Confidence Limit (95`h Percentile) or Central Tendency Value Analysis Result3 Source Area 1 Background Wells MW-04 Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-04A Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-04B Upper Surficial 6.9 NC NC 12 NC 4328 114 NC 9.8 198 NC NC 152 64 NC NC 2.4 NC 2.6 6.2 141 MW-05A Upper Surficial 3.9 NC NC 1.3 NC 310 30 NC 5.7 NC NC NC NC 0.16 NC NC 0.11 NC 0.23 1 NC MW-05B Upper Surficial 4.4 <1 <50 2.5 0.08 29 23 <1 6 <25 2.3 <0.3 <5 0.77 <0.1 <5 0.23 <1 0.52 1.4 7.1 MW-05C Lower Surficial 5.6 <1 <50 12 0.08 11 <5 <1 9.6 49 <1 <0.3 8.4 3.1 <0.1 <5 1.8 <1 1.1 8.3 19 MW-08 Lower Surficial 5.6 <1 <50 13 0.05 19 176 <1 11 55 <1 <0.3 13 4.8 <0.1 <5 2.4 <1 1.2 10 32 MW-08B Upper Surficial 5.9 1.2 <50 4.1 <0.025 4364 5.7 <1 0.93 <25 <1 0.41 16 4.7 <0.1 <5 0.26 <1 0.4 1.9 16 MW-37B Upper Surficial 4.7 <1 <50 3.9 0.03 <10 6.8 <1 4.9 <25 <1 <0.3 <5 0.46 0.17 <5 0.13 <1 0.21 2.1 5 MW-37C Lower Surficial 6 2.2 <50 3.8 <0.025 7496 162 <1 7.5 66 2.1 0.95 32 10 <0.1 <5 1.3 <1 2.4 2.2 15 MW-41B Upper Surficial 4.6 <1 <50 3.5 <0.025 261 9.8 <1 <0.1 <25 1.2 <0.3 <5 0.6 <0.1 <5 0.21 <1 0.37 2 <5 MW-41C Lower Surficial 6.3 14 <50 3.4 <0.025 24624 325 <1 1 <25 6.2 <0.3 17 2.3 <0.1 <5 1.2 1.1 0.78 2.5 14 Source Area 1 Upper Surficial Flow Zone Assessment Wells AW-01B Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC AW-02B Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC AW-03B Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC AW-04B Upper Surficial 4.5 NC NC 2 NC 33 <5 NC 5.3 NC NC NC NC 2 NC NC NC NC 0.79 1.2 9.7 AW-05B Upper Surficial 4.9 NC NC 1.8 NC 165 <5 NC 9.9 <25 NC NC NC 3 NC NC 0.01 NC 0.12 <0.05 11 AW-06B Upper Surficial 4.9 NC NC 2 NC <10 9.7 NC 6.3 <25 NC NC NC 1.5 NC NC 0.16 NC 0.38 1.2 15 AW-06RB Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC AW-08B Upper Surficial 4.5 NC NC 2.2 NC 1369 22 NC 8 NC 1.1 <0.3 NC 0.51 NC NC 0.34 NC 0.68 1.1 <5 AW-09B Upper Surficial 4.6 NC NC 2.9 NC 60 7.2 NC 6.7 NC NC <0.3 NC 0.93 NC NC 0.3 NC 0.29 1.7 10 BMW-01 Upper Surficial 4.1 <1 <50 2.2 NC <10 22 <1 <0.1 107 <1 NC <5 2.8 <0.1 <5 0.05 <1 4.1 7.5 NC BMW-02 Upper Surficial 5.3 1.1 <50 0.7 NC 365 12 1.7 11 141 <1 NC 32 33 <0.1 <5 3.7 4.2 3.4 11 NC BMW-03 Upper Surficial 5 <1 <50 4.8 NC <10 8.5 <1 31 109 1.1 NC 22 21 0.1 <5 0.54 <1 1.1 3.7 NC BMW-04 Upper Surficial 7 <1 176 4.7 NC NC <5 13 47 326 <1 NC 168 42 <0.1 <5 3.6 5.8 4.1 7.3 NC CCR-102B Upper Surficial 9 83 58 2.7 NC NC NC NC 5.6 75 NC NC 52 19 0.41 22 2 49 3.7 2.1 NC CCR-103B Upper Surficial 6.5 119 1282 0.46 NC NC NC NC 44 192 NC NC 107 38 0.45 94 7.8 52 9 6.9 NC CCR-104B Upper Surficial 6.9 284 1187 16 NC NC NC NC 41 469 NC NC 403 112 0.54 236 29 36 11 23 NC CCR-105B Upper Surficial 7 258 677 29 NC NC NC NC 38 375 NC NC 254 68 0.68 196 18 17 10 32 NC CCR-106B Upper Surficial 6.8 169 582 27 NC NC NC NC 32 250 NC NC 138 43 0.53 171 13 13 9 24 NC CCR-107B Upper Surficial 6.6 19 334 31 NC NC NC NC <0.1 227 NC NC 143 36 0.21 87 8.2 NC 8.8 33 NC CCR-107RB Upper Surficial 6.9 8.2 333 28 NC NC NC <1 41 332 <1 NC 190 32 0.32 105 7.4 3.3 8.3 62 NC CCR-108B Upper Surficial 6.7 105 406 1.4 NC NC NC NC 23 247 1.7 NC 149 46 0.33 75 11 4.2 7.5 5.5 NC CCR-108RB Upper Surficial 7.4 103 142 5.5 NC NC NC <1 9.6 116 <1 NC 71 16 0.49 54 3.2 35 3.5 14 NC CCR-109B Upper Surficial 6.5 38 <50 8.9 NC NC NC 2.3 <0.1 <25 1.7 NC 140 59 0.25 <5 14 39 <0.1 <0.05 NC CCR-110B Upper Surficial 6.2 58 3171 125 0.03 4515 99 <1 140 542 <1 0.6 97 68 <0.1 9.5 12 60 24 77 3215 CCR-111B Upper Surficial 6.7 206 1832 0.85 NC NC NC <1 16 448 <1 NC 353 106 0.14 111 28 72 14 22 NC CCR-112B Upper Surficial 6.1 43 586 16 <0.025 7955 47 <1 5.3 133 <1 1.5 72 20 0.17 37 5.9 26 5.5 17 1155 CCR-113B Upper Surficial 6.5 90 414 22 NC NC NC <1 42 159 <1 NC 29 23 0.31 45 4.3 56 7.4 18 NC CCR-114B Upper Surficial 6.2 <1 <50 7.7 <0.025 119 19 <1 18 85 <1 0.56 34 21 <0.1 <5 0.81 <1 2.8 5.8 139 CCR-115B Upper Surficial 6.1 <1 <50 1.8 0.08 35 <5 <1 16 58 <1 0.42 16 15 <0.1 12 0.85 11 2 4.1 82 CCR-116B Upper Surficial 5.6 <1 61 4.8 NC NC NC 3.4 9.9 90 1 NC 18 22 <0.1 <5 0.53 2.1 1.1 4 NC CCR-117B Upper Surficial 6.2 <1 <50 3.4 NC NC NC 1.3 8.6 67 <1 NC 38 26 <0.1 <5 0.61 <1 1.2 2.9 NC CCR-118B Upper Surficial 6.1 <1 <50 2.4 NC NC NC 1.3 10 51 <1 NC 27 26 <0.1 <5 0.7 2.5 1.1 3.2 NC CCR-119B Upper Surficial 6.6 1 <1 1 62 5.5 NC NC NC 2.3 5.6 27 <1 NC 29 15 I <0.1 1 <5 0.81 <1 0.85 3.2 NC Page 1 of 5 TABLE 5-4 SUMMARY OF CENTRAL TENDENCY AND LOWER CONFIDENCE LIMIT ANALYSIS RESULTS - SA1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter (2018 CSA Update COI List) pH Arsenic Boron Chloride Hexavalent Chromium Iron Manganese Selenium Sulfate Total Dissolved Solids Cobalt Vanadium Alkalinity Calcium Fluoride Lithium Magnesium Molybdenum Potassium Sodium Strontium Reporting Units S.U. pg/L Ng/L mg/L pg/L Ng/L Ng/L pg/L mg/L mg/L pg/L Ng/L mg/L mg/L mg/L pg/L mg/L pg/L mg/L mg/L pg/L 15A NCAC 02L Standard 6.5 - 8.5 10 700 250 10 300 50 20 250 500 1* 0.3* NE NE 2 NE NE NE I NE NE NE 2018 Background Threshold Values (Upper Surficial Flow Zone)' 6.5 - 8.5 1 50 5 0.03 468 43 1 16 25 0.9 0.3 5 0.9 NE NE 0.5 1 0.7 3 8 2020 Background Threshold Values (Upper Surficial Flow Zone)Z 4.1 - 7.3 2 50 6 0.06 6270 113 1 1 1 15 1 64 1 3 2 1 20 1 8.12 1 0.2 1 5 1 0.5 1 0.8 1 3 1 71 2018 Background Threshold Values (Lower Surficial Flow Zone)' 4.1 - 5.1 3 50 18 0.1 9540 470 1 19 110 3 1 68 18 NE NE 3 1 0.5 13 45 2020 Background Threshold Values (Lower Surficial Flow Zone)2 5.1 - 7.3 14 50 1 30 1 0.1 1 283001 744 1 1 1 22 1 880 1 7 1 2 1 165 1 68 1 0.5 1 5 1 3 1 1 5 13 167 Sample ID I Flow Zone Lower Confidence Limit (95th Percentile) or Central Tendency Value Analysis Result3 Source Area 1 Upper Surficial Flow Zone Assessment Wells (Continued) CCR-120B Upper Surficial 5.8 <1 <50 9.3 NC NC NC 1.5 42 124 <1 NC 63 42 <0.1 <5 1.8 26 <0.1 7.1 NC CCR-121B Upper Surficial 6.5 <1 <50 7.2 NC NC NC <1 24 106 <1 NC 82 52 <0.1 <5 1.1 21 0.5 4.1 NC CCR-121RB Upper Surficial 7.1 8.3 200 20 NC NC NC <1 94 346 <1 NC 130 23 0.17 6 3.9 60 5 79 NC CCR-122B Upper Surficial 5.1 <1 <50 2.7 NC NC NC <1 16 271 1.2 NC 134 78 <0.1 <5 3.8 45 1.2 1.9 NC CCR-122RB Upper Surficial 8.2 6 70 14 NC NC NC <1 170 381 <1 NC 79 20 0.79 i5 2.3 63 3.8 93 NC CCR-123B Upper Surficial 6 <1 <50 1 <0.1 NC NC NC <1 46 132 <1 NC 39 26 0.15 <5 1 <0.005 1.9 <0.1 3 NC CCR-123RB Upper Surficial 6.3 <1 59 84 NC NC NC 1.7 270 643 1.5 NC 87 88 0.1 38 8.2 27 24 90 NC CCR-124B Upper Surficial 5.4 <1 <50 2.8 NC NC NC 8.6 2.3 39 <1 NC <5 3.7 <0.1 <5 0.68 4.3 1.1 2 NC CCR-124RB Upper Surficial 6.3 <1 <50 21 NC NC NC 19 52 209 <1 NC 57 18 0.18 13 2.1 63 3.8 43 NC DMW-01 Upper Surficial 3.2 <1 <50 1.9 NC <10 16 <1 11 51 <1 NC 7 <0.01 <0.1 <5 0.63 <1 6.5 1.4 NC DMW-02 Upper Surficial 4.7 <1 <50 5.3 NC <10 24 1.7 18 56 <1 NC <5 5 <0.1 <5 0.67 <1 7.3 2.8 NC DMW-03 Upper Surficial 6.1 <1 63 4.4 NC <10 <5 2.9 23 158 <1 NC 56 43 <0.1 <5 1 3.6 4.6 3.5 NC DMW-04 Upper Surficial 5.8 <1 <50 5 NC <10 <5 <1 25 99 <1 NC 8.9 17 <0.1 <5 0.49 <1 4.8 3.7 NC FPA-02B Upper Surficial 5.7 <1 <50 2.5 0.03 96 11 <1 1.4 <25 <1 102 <5 3 <0.1 <5 0.19 2.6 0.56 1.4 38 FPA-03B Upper Surficial 6.1 <1 68 3.1 <0.025 737 35 <1 60 171 <1 <0.3 54 40 0.13 5.3 3.3 13 4.2 3.1 464 FPA-04B Upper Surficial 3.9 <1 <50 2.4 <0.025 <10 44 <1 <0.1 45 1.3 <0.3 5.1 1.7 <0.1 <5 0.22 <1 0.83 1.4 11 FPA-09B Upper Surficial 6.3 4.2 86 7.6 <0.025 13459 381 <1 92 285 <1 0.86 70 56 0.15 66 6.2 14 7.1 7.4 1117 GWPZ-01A Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC GWPZ-016 Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-02B Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-03B Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-06B Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-07A Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-07B Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-22B Upper Surficial 5.3 NC NC 2 0.09 NC 6 NC 3 NC NC NC NC 1.2 NC NC 0.19 NC 0.28 1.3 6.5 MW-23B Upper Surficial 6.2 <1 <50 2.3 0.07 <10 <5 <1 14 98 <1 <0.3 58 31 <0.1 <5 1 49 0.69 2.7 268 MW-24B/RB Upper Surficial 3.9 <1 <50 2.8 <0.025 <10 6.4 <1 <0.1 <25 <1 <0.3 <5 2.3 <0.1 <5 0.42 <1 0.59 1.8 <5 MW-27B Upper Surficial 4.7 <1 <50 <0.1 0.05 <10 23 2.9 8.9 <25 <1 <0.3 <5 2.7 <0.1 5.7 0.62 <1 1.1 <0.05 <5 MW-28B Upper Surficial 5.2 NC NC 3.3 0.05 <10 38 NC 10 33 NC NC NC 3.8 <0.1 NC 0.76 NC 0.89 1.6 37 MW-31B Upper Surficial 5.6 NC NC 3.8 NC 361 27 NC 7.5 29 NC NC <5 3.6 NC NC 0.84 NC 0.85 2.3 63 MW-34B Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-35B Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-36B Upper Surficial 6.3 <1 <50 3 0.03 31 <5 <1 7.5 59 <1 0.95 23 14 <0.1 17 0.66 46 0.82 2.1 55 MW-38B Upper Surficial 4.5 NC NC 3.5 NC <10 13 NC 18 NC <1 <0.3 NC 1.2 <0.1 NC 0.36 NC 0.46 2.4 5.7 MW-39B Upper Surficial 5.7 NC NC 3.5 NC 4101 66 NC NC 30 NC 0.54 13 4.1 NC NC 0.8 NC 0.9 2.9 26 MW-40B Upper Surficial 5.4 NC <50 3 NC 4027 14 NC 18 51 <1 0.43 14 9.5 NC NC 0.68 4.2 0.34 <0.05 40 MW-42B Upper Surficial 5.9 <1 <50 3.8 NC NC NC <1 10 46 <1 NC 22 14 <0.1 <5 0.56 2.2 0.59 2.1 NC SMW-01B Upper Surficial 4.7 <1 98 9.9 0.07 20 5.6 <1 36 77 <1 <0.3 8.6 11 <0.1 <5 1.1 <1 2 6.1 50 SMW-02B Upper Surficial 6.2 NC NC 2.6 NC <10 <5 NC 5.8 106 NC 1.4 52 24 NC NC NC <1 0.79 4.8 47 SMW-03B Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC SMW-04B Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC SMW-05B Upper Surficial 6.3 <1 51 7.1 <0.025 142 6.1 <1 10 118 <1 0.63 36 22 <0.1 <5 1.3 <1 1.5 4.6 55 SMW-06B Upper Surficial 1 6.2 1 <1 54 7 0.03 37 <5 <1 12 100 <1 1.9 46 1 19 1 <0.1 <5 1.2 <1 1.2 4.4 56 Page 2 of 5 TABLE 5-4 SUMMARY OF CENTRAL TENDENCY AND LOWER CONFIDENCE LIMIT ANALYSIS RESULTS - SA1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter (2018 CSA Update COI List) pH Arsenic Boron Chloride Hexavalent Chromium Iron Manganese Selenium Sulfate Total Dissolved Solids Cobalt Vanadium Alkalinity Calcium Fluoride Lithium Magnesium Molybdenum Potassium Sodium Strontium Reporting Units S.U. pg/L Ng/L mg/L pg/L Ng/L Ng/L pg/L mg/L mg/L pg/L Ng/L mg/L mg/L mg/L pg/L mg/L Ng/L mg/L mg/L Ng/L 15A NCAC 02L Standard 6.5 - 8.5 10 700 250 10 300 50 20 250 500 1* 0.3* NE NE 2 NE NE NE I NE NE NE 2018 Background Threshold Values (Upper Surficial Flow Zone)' 6.5 - 8.5 1 50 5 0.03 468 43 1 16 25 0.9 0.3 5 0.9 NE NE 0.5 1 0.7 3 8 2020 Background Threshold Values (Upper Surficial Flow Zone)Z 4.1 - 7.3 2 50 6 0.06 6270 113 1 1 1 15 1 64 1 3 2 1 20 1 8.12 1 0.2 1 5 1 0.5 1 0.8 1 3 1 71 2018 Background Threshold Values (Lower Surficial Flow Zone)' 4.1 - 5.1 3 50 18 0.1 9540 470 1 19 110 3 1 68 18 NE NE 3 1 0.5 13 45 2020 Background Threshold Values (Lower Surficial Flow Zone)2 5.1-7.3 14 50 1 30 1 0.1 1 283001 744 1 1 1 22 1 880 1 7 1 2 1 165 1 68 1 0.5 1 5 1 3 1 1 5 13 1 167 Sample ID I Flow Zone I Lower Confidence Limit (95th Percentile) or Central Tendency Value Analysis Result3 Source Area 1 Lower Surficial Flow Zone Assessment Wells AW-01C Lower Surficial 5.1 NC <50 0.53 0.25 <10 38 NC 22 25 NC NC NC 5.4 NC NC 1.3 NC 1.6 1.1 50 AW-02C Lower Surficial 5 NC NC 5.9 NC 165 16 NC 17 39 NC <0.3 NC 5.3 NC NC 0.56 <1 0.88 3.7 15 AW-03C Lower Surficial 5.1 <1 <50 <0.1 <0.025 <10 <5 <1 <0.1 <25 1.8 0.4 <5 <0.01 <0.1 <5 <0.005 <1 1.3 <0.05 <5 AW-04C Lower Surficial 4.7 <1 429 15 0.03 82 27 <1 48 96 6 0.66 9.2 19 0.22 <5 2.5 <1 2.7 13 241 AW-05C Lower Surficial 4.9 <1 <50 4.7 0.03 <10 <5 <1 11 27 <1 0.32 6.1 6.3 0.15 <5 0.14 <1 0.43 2.3 5.8 AW-08C Lower Surficial 5 <1 <50 10 0.15 <10 1 26 <1 15 1 45 <1 <0.3 <5 3.2 <0.1 <5 1.7 <1 1.6 7.1 34 AW-09C Lower Surficial 4.5 <1 230 12 <0.025 <10 34 <1 2.7 <25 <1 <0.3 <5 10 <0.1 <5 1.4 <1 1.8 11 92 CCR-102C Lower Surficial 6.6 32 2511 52 NC NC NC NC 140 399 3 NC 121 64 NC 23 16 136 15 41 NC CCR-103C Lower Surficial 6.8 179 2849 36 NC NC NC NC 159 582 20 NC 231 114 0.45 165 29 121 17 37 NC CCR-104C Lower Surficial 7.7 429 643 35 NC NC NC NC 65 222 1.5 NC 87 37 1.3 73 5.7 46 9.3 30 NC CCR-105C Lower Surficial 7.4 169 1521 43 NC NC NC NC 69 351 1.6 NC 168 58 1.3 168 16 121 12 36 NC CCR-106C Lower Surficial 7 222 390 33 NC NC NC NC 57 205 8.3 NC 78 30 0.28 149 8 36 7.2 27 NC CCR-107C Lower Surficial 6.7 38 312 26 NC NC NC NC 24 227 NC NC 97 34 0.24 112 8.4 1.9 6.7 24 NC CCR-107RC Lower Surficial 7.5 <1 452 150 NC NC NC <1 200 666 <1 NC 130 73 0.15 34 10 24 14 130 NC CCR-108C Lower Surficial 6.7 58 236 31 NC NC NC NC 45 197 NC NC 66 27 0.38 176 7 13 7.7 27 NC CCR-108RC Lower Surficial 7 25 453 38 NC NC NC <1 42 326 <1 NC 180 45 0.36 172 12 22 9.3 42 NC CCR-109C Lower Surficial 6.6 81 1402 40 NC NC NC <1 106 373 11 NC 97 64 0.19 100 20 214 13 38 1 NC CCR-110C Lower Surficial 6.5 92 1968 81 <0.025 10500 225 <1 115 436 12 0.44 106 54 <0.1 <5 15 150 15 62 1585 CCR-111C Lower Surficial 6.5 65 1437 37 NC NC NC <1 91 393 8.8 NC 122 54 <0.1 <5 14 214 10 36 NC CCR-112C Lower Surficial 6.6 2.8 769 11 <0.025 1365 113 <1 20 139 1.1 <0.3 74 24 <0.1 <5 6.5 127 7.1 11 992 CCR-113C Lower Surficial 6.5 13 162 <0.1 NC NC NC <1 <0.1 <25 <1 NC 33 7.2 0.14 16 1.1 93 3.6 <0.05 NC CCR-114C Lower Surficial 6.6 <1 <50 2.7 <0.025 16 5.3 20 <0.1 <25 <1 3.3 23 10 <0.1 <5 0.84 67 3.6 1.2 198 CCR-115C Lower Surficial 5.3 <1 251 1.3 0.07 818 47 29 27 89 6.8 1.7 <5 9.1 <0.1 10 2.2 <1 5.3 15 136 CCR-116C Lower Surficial 5.4 <1 186 1 5.5 NC NC NC 4 32 74 <1 NC <5 8.1 <0.1 <5 1.9 3.9 4.6 9.5 NC CCR-117C Lower Surficial 5.4 <1 <50 <0.1 NC NC NC 1.4 <0.1 93 <1 NC <5 2.2 <0.1 <5 0.28 2.3 1.6 <0.05 NC CCR-118C Lower Surficial 6.5 <1 <50 <0.1 NC NC NC <1 5.9 <25 <1 NC <5 2.4 <0.1 <5 0.47 29 1.7 1.1 NC CCR-119C Lower Surficial 6.1 1.1 <50 1.3 NC NC NC <1 5.7 93 1.3 NC 39 10 <0.1 6.5 1 2.9 <1 2.6 4.5 NC CCR-120C Lower Surficial 4.8 <1 752 68 NC NC NC <1 106 261 17 NC 6.3 28 <0.1 <5 8.5 <1 3.9 44 NC CCR-121C Lower Surficial 6 1.6 129 3.8 NC NC NC 2.4 9.9 63 <1 NC 40 21 <0.1 <5 2 65 2.2 3.6 NC CCR-121RC Lower Surficial 7 <1 1 1190 110 NC NC NC <1 130 514 <1 NC 150 75 <0.1 <5 13 8.7 7.8 71 NC CCR-122C Lower Surficial 5.8 <1 987 48 NC NC NC <1 65 226 4.2 NC 30 27 0.1 <5 7.3 86 8.6 33 NC CCR-122RC Lower Surficial 6.8 2.9 145 77 NC NC NC <1 40 258 <1 NC 44 26 0.32 32 7.7 8 7.2 31 NC CCR-123C Lower Surficial 5.9 32 <50 9.1 NC NC NC 6.2 29 121 <1 NC 28 25 <0.1 <5 1.1 22 1.7 0.61 NC CCR-123RC Lower Surficial 6.5 31 1000 46 NC NC NC <1 66 327 1.1 NC 140 57 0.21 61 9.9 15 7.6 35 NC CCR-124C Lower Surficial 6.1 <1 545 21 NC NC NC <1 61 217 1.6 NC 42 39 0.24 22 5.5 83 5.4 11 NC CCR-124RC Lower Surficial 7.2 3.5 155 59 NC NC NC <1 180 478 <1 NC 119 31 0.65 35 5.4 72 12 123 NC CCR-201C Lower Surficial 5.1 <1 <50 7.7 NC NC NC <1 21 47 <1 NC <5 7.7 <0.1 <5 0.69 <1 0.67 4.8 NC CCR-202C Lower Surficial 5.5 <1 76 9.4 NC NC NC <1 20 62 2.1 NC <5 7.5 <0.1 <5 1.2 <1 2.4 5.1 NC CCR-203C Lower Surficial 5.7 <1 <50 <0.1 NC NC NC 1.8 17 <25 <1 NC 15 9.4 <0.1 <5 2 43 3.5 2.3 1 NC CCR-204C Lower Surficial 5.9 <1 207 23 NC NC NC <1 38 105 <1 NC <5 15 <0.1 <5 0.71 <1 1.7 13 NC CCR-205C Lower Surficial 6.5 <1 419 4.8 NC NC NC <1 11 45 1.4 NC <5 13 <0.1 <5 2.3 <1 4.4 9.4 NC CCR-206C Lower Surficial 6.4 1.9 181 11 NC NC NC <1 12 97 1 NC 58 16 <0.1 <5 4.2 8.1 3.2 12 NC CCR-207C Lower Surficial 4.5 <1 76 4.1 NC NC NC 1.3 9.5 41 <1 NC <5 4.7 <0.1 <5 0.74 <1 2.4 3.2 NC CCR-208C Lower Surficial 4.8 <1 <50 2.8 NC NC NC 1.1 7.9 26 <1 NC <5 2 <0.1 <5 0.45 <1 1.1 1 1.8 NC FPA-02C Lower Surficial 6.3 7.3 563 24 <0.025 5458 478 <1 53 135 <1 0.59 41 32 <0.1 <5 5.4 30 6.5 18 1 731 FPA-03C Lower Surficial 6.2 6.8 511 13 <0.025 4090 143 <1 9.6 128 3 <0.3 43 18 <0.1 <5 4.2 119 5.3 9.6 1 382 Page 3 of 5 TABLE 5-4 SUMMARY OF CENTRAL TENDENCY AND LOWER CONFIDENCE LIMIT ANALYSIS RESULTS - SA1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter (2018 CSA Update COI List) pH Arsenic Boron Chloride Hexavalent Chromium Iron Manganese Selenium Sulfate Total Dissolved Solids Cobalt Vanadium Alkalinity Calcium Fluoride Lithium Magnesium Molybdenum Potassium Sodium Strontium Reporting Units S.U. pg/L Ng/L mg/L pg/L Ng/L Ng/L pg/L mg/L mg/L pg/L Ng/L mg/L mg/L mg/L pg/L mg/L Ng/L mg/L mg/L Ng/L 15A NCAC 02L Standard 6.5 - 8.5 10 700 250 10 300 50 20 250 500 1* 0.3* NE NE 2 NE NE NE I NE NE NE 2018 Background Threshold Values (Upper Surficial Flow Zone)' 6.5 - 8.5 1 50 5 0.03 468 43 1 16 25 0.9 0.3 5 0.9 NE NE 0.5 1 0.7 3 8 2020 Background Threshold Values (Upper Surficial Flow Zone)Z 4.1 - 7.3 2 50 6 0.06 6270 113 1 1 1 15 1 64 1 3 2 1 20 1 8.12 1 0.2 1 5 1 0.5 1 0.8 1 3 1 71 2018 Background Threshold Values (Lower Surficial Flow Zone)' 4.1 - 5.1 3 50 18 0.1 9540 470 1 1 1 19 1 110 1 3 1 1 68 1 18 1 NE I NE 1 3 1 1 0.5 13 1 45 2020 Background Threshold Values (Lower Surficial Flow Zone)2 5.1 - 7.3 14 50 1 30 1 0.1 1 283001 744 1 1 1 22 1 880 1 7 1 2 1 165 1 68 1 0.5 1 5 1 3 1 1 1 5 13 1 167 Sample ID I Flow Zone Lower Confidence Limit (95th Percentile) or Central Tendency Value Analysis Result3 Source Area 1 Lower Surficial Flow Zone Assessment Wells (Continued) FPA-04C Lower Surficial 6.2 1.9 378 8.1 <0.025 4225 233 <1 10 111 <1 0.98 29 19 <0.1 <5 2.9 36 4.3 6.6 440 FPA-09C Lower Surficial 6.3 21 1035 21 <0.025 4736 196 <1 46 225 <1 <0.3 71 26 0.13 10 7.1 90 8.2 19 718 MW-02C Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-06C Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-07C Lower Surficial 4.7 <1 322 14 0.03 24 95 <1 48 92 <1 <0.3 <5 11 <0.1 <5 2.4 <1 2.8 12 131 MW-09 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-10 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-11 Lower Surficial 4.6 NC NC 8.1 0.04 59 58 NC 26 31 NC 0.35 NC 7 NC NC 0.82 NC 0.73 5.1 26 MW-12 Lower Surficial 4.4 NC 977 39 NC 382 346 NC 96 162 <1 0.35 29 39 NC NC 5.4 17 4.7 21 922 MW-12R Lower Surficial 6.1 1 219 12 <0.025 21204 405 <1 121 306 6.5 0.3 128 42 0.21 <5 7.9 37 5.8 24 <5 MW-17 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-18 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-19 Lower Surficial 6.1 <1 668 16 <0.025 <10 295 NC 46 48 <1 1.1 40 18 NC NC 2.8 31 4.8 13 462 MW-21C Lower Surficial 6 <1 348 6 <0.025 <10 275 <1 <0.1 57 <1 0.92 27 <0.01 <0.1 <5 <0.005 37 2.2 5.2 <5 MW-22C Lower Surficial 6.1 <1 214 13 0.05 58 98 3.7 6.6 53 2.1 <0.3 23 8.8 <0.1 <5 1.2 68 4.1 4.3 222 MW-23C Lower Surficial 5.9 <1 52 1.5 0.06 36 <5 1 6.9 <25 11 0.44 12 <0.01 <0.1 <5 <0.005 61 <0.1 1 132 MW-24C/RC Lower Surficial 5.9 <1 66 <0.1 0.03 <10 <5 <1 <0.1 51 <1 0.39 16 9.1 <0.1 <5 1.2 32 1.8 2 <5 MW-27C Lower Surficial 4.7 <1 71 5.3 0.07 66 <5 <1 25 41 <1 0.32 <5 5.3 <0.1 <5 1.1 <1 3.2 5.7 73 MW-28C Lower Surficial 4.7 <1 <50 3.1 0.22 <10 17 <1 12 28 <1 <0.3 <5 4 <0.1 <5 0.69 <1 1.3 1.8 51 MW-31C Lower Surficial 5.2 NC 1261 160 NC 1941 1717 NC 150 485 NC <0.3 13 53 NC NC 14 NC 6.4 76 614 MW-31RC Lower Surficial 5.6 <1 <50 <0.1 0.05 <10 <5 <1 <0.1 <25 <1 <0.3 5.5 4.8 <0.1 <5 <0.005 <1 <0.1 <0.05 <5 MW-32C Lower Surficial 4.6 NC NC 2.8 NC <10 33 NC 7.2 26 NC <0.3 NC 1.5 NC NC 0.63 NC 1.4 1.4 9.2 MW-33C Lower Surficial 4.8 <1 <50 3.3 0.04 <10 16 <1 11 26 <1 <0.3 <5 3.4 <0.1 <5 0.56 <1 1.5 2.1 23 MW-34C Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-35C Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-36C Lower Surficial 5.5 <1 124 2.1 0.12 68 <5 3.2 23 38 <1 0.39 <5 5.3 <0.1 <5 1.3 <1 4.7 8.3 91 MW-38C Lower Surficial 4.9 <1 110 19 0.46 10 <5 7.7 29 59 <1 <0.3 <5 7.4 <0.1 <5 2.5 <1 2.4 11 83 MW-39C Lower Surficial 4.9 <1 <50 3.9 <0.025 <10 58 <1 8.6 28 <1 2.1 <5 1.6 <0.1 <5 0.67 <1 1.2 2.3 12 MW-40C Lower Surficial 6 <1 243 14 0.06 <10 <5 39 41 100 1.2 0.34 17 13 <0.1 <5 2.6 3.1 6 15 215 MW-42C Lower Surficial 5.1 <1 189 7.1 NC NC NC 2.2 27 68 <1 NC <5 10 <0.1 <5 1.2 <1 2.6 4.9 NC PZ-06D Lower Surficial 7.7 <1 770 NC NC 251 41 NC 36 NC NC 0.56 172 NC NC NC 6.1 it 7.2 NC 115 PZ-10D Lower Surficial 7.6 NC 360 121 NC 370 49 NC 24 341 NC 0.45 125 15 NC NC 6.9 2 5 112 105 PZ-23D Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC PZ-25 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC PZ-INT Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC SMW-01C Lower Surficial 4.5 <1 730 42 <0.025 378 557 <1 129 235 2.7 0.67 <5 32 0.1 <5 6.2 <1 4.9 32 417 SMW-02C Lower Surficial 5.2 <1 218 16 <0.025 461 1227 <1 56 114 4.7 <0.3 8 19 <0.1 <5 2.5 <1 2.2 11 153 SMW-03C Lower Surficial 4.8 <1 111 12 0.04 143 143 <1 65 144 1.7 <0.3 <5 23 <0.1 <5 2.5 <1 1.9 8.4 128 SMW-04C Lower Surficial 4.5 1 <1 <50 8.9 0.03 <10 24 <1 23 52 2.9 <0.3 <5 5.5 <0.1 <5 1.5 <1 1 7.1 35 SMW-05C Lower Surficial 4.8 <1 130 10 0.04 <10 53 <1 27 45 <1 <0.3 <5 11 <0.1 <5 1.1 <1 1.2 1 7 80 SMW-06C Lower Surficial 4.6 <1 110 11 <0.025 200 161 <1 1 54 91 2.2 0.46 <5 10 <0.1 <5 1.6 <1 2.6 13 73 SMW-06D Lower Surficial 8.1 <1 1098 190 0.06 19 18 <1 2.4 665 <1 0.94 327 7.2 1 6 3.9 <1 7.2 264 84 SUT-EW-01 Lower Surficial 5.3 <1 90 7.4 <0.025 26 59 <1 23 62 1.2 <0.3 <5 8.5 <0.1 <5 0.95 <1 1.5 5.4 73 SUT-EW-02 Lower Surficial 5.2 <1 154 9.2 <0.025 341 142 <1 49 116 <1 <0.3 15 20 <0.1 <5 1.9 <1 2 11 1 148 SUT-EW-03 Lower Surficial 6.2 <1 181 11 0.05 80 40 <1 30 109 <1 0.43 20 18 <0.1 <5 1.6 1.3 2.1 8.2 143 SUT-EW-04 Lower Surficial 6 <1 190 13 0.05 828 330 <1 110 222 1.3 <0.3 31 44 <0.1 1 <5 4.3 3.7 4.8 13 1 283 Page 4 of 5 TABLE 5-4 SUMMARY OF CENTRAL TENDENCY AND LOWER CONFIDENCE LIMIT ANALYSIS RESULTS - SA1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter (2018 CSA Update COI List) pH Arsenic Boron Chloride Hexavalent Chromium Iron Manganese Selenium Sulfate Total Dissolved Solids Cobalt Vanadium Alkalinity Calcium Fluoride Lithium Magnesium Molybdenum Potassium Sodium Strontium Reporting Units S.U. pg/L pg/L mg/L pg/L pg/L pg/L pg/L mg/L mg/L pg/L pg/L mg/L mg/L mg/L pg/L mg/L pg/L mg/L mg/L pg/L 15A NCAC 02L Standard 6.5 - 8.5 10 700 250 10 300 50 20 250 500 1* 0.3* NE NE 2 NE NE NE NE NE NE 2018 Background Threshold Values (Upper Surficial Flow Zone)' 6.5 - 8.5 1 50 5 0.03 468 43 1 16 25 0.9 0.3 5 0.9 NE NE 0.5 1 0.7 3 8 2020 Background Threshold Values (Upper Surficial Flow Zone)Z 4.1 - 7.3 1 2 50 6 1 0.06 1 6270 1 113 1 1 15 1 64 3 2 20 1 8.12 0.2 5 1 0.5 1 1 0.8 1 3 71 2018 Background Threshold Values (Lower Surficial Flow Zone)' 4.1 - 5.1 3 50 18 1 0.1 1 9540 1 470 1 1 1 19 1 110 1 3 1 1 68 1 18 1 NE I NE 1 3 1 1 1 0.5 1 13 1 45 2020 Background Threshold Values (Lower Surficial Flow Zone)Z 5.1 - 7.3 1 14 50 1 30 1 0.1 1 28300 744 1 1 1 22 1 880 1 7 1 2 1 165 1 68 1 0.5 1 5 1 3 1 1 1 5 1 13 1 167 Sample ID I Flow Zone Lower Confidence Limit (95`h Percentile) or Central Tendency Value Analysis Result3 Source Area 1 Lower Surficial Flow Zone Assessment Wells (Continued) SUT-EW-05 Lower Surficial 6.2 <1 264 16 <0.025 2410 176 <1 50 167 <1 0.34 53 30 <0.1 <5 3.7 7.3 3.3 14 227 SUT-EW-06 Lower Surficial 5.7 <1 291 23 0.05 160 118 <1 40 118 <1 0.4 19 19 <0.1 <5 2.4 8.5 2.7 15 256 SUT-EW-07 Lower Surficial 5.8 <1 259 25 0.04 810 100 <1 40 128 1.5 0.39 17 19 <0.1 <5 2.5 5.5 2.5 15 220 SUT-EW-08 Lower Surficial 5.7 <1 290 26 <0.025 2960 206 <1 36 106 4.5 0.46 16 16 <0.1 <5 2.7 <1 2.3 16 177 SUT-EW-09 Lower Surficial 5.8 <1 65 8.2 0.04 120 95 <1 23 68 <1 <0.3 7.4 11 <0.1 <5 1.3 <1 1.7 5.7 55 TW-132 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC TW-136 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC TW-202 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC TW-46 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC V-DPT-01 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC V-DPT-02 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC V-DPT-03 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC V-DPT-04 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC V-DPT-05 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC V-DPT-06 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC V-DPT-07 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC Notes: O - bold highlighted concentration indicates value is greater than applicable regulatory standard (02L or IMAC) bold highlighted concentration indicates value is greater than greatest background threshold value where there is no regulatory standard, or 2020 background threshold values are greater than regulatory standard 2018 Background threshold values were calculated using data from background groundwater samples collected June 2015 to April 2017. 2018 Background threshold values approved by NCDEQ on May 14, 2018. Z 2020 Updated background threshold values were calculated using data from background groundwater samples collected October 2010 to December 2018 and submitted to NCDEQ February 2020. The 2020 background threshold value updates retain outlier concentrations in background groundwater datasets (SynTerra, 2020). 3 Lower Confidence Limit or Central Tendency values calculated from data ranging from January 2015 to March 2020. See Appendix Q CSA - comprehensive site assessment NCAC - North Carolina Administrative Code COI - constituent of interest NC - not calculated NE - not established mg/L - milligrams per liter S.0 - standard units pg/L - microgram per liter * - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013. < - concentration not detected at or above the adjusted reporting limit. Prepared by: PPB Checked by: GTC Page 5 of 5 TABLE 5-5 SEDIMENT CONCENTRATIONS OF COIs - SA1 AND SA2 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter Cation Exchange Capacity Fractional Organic Carbon Fractional Organic Matter Percent Moisture Percent Solids Percent Total Solids pH Oxidation Reduction potential Aluminum Antimony Arsenic Barium Beryllium Boron Cadmium Calcium Chloride Chromium Cobalt Reporting Units meq/300g % % % % % S.U. my mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg PSRG Protection of Groundwater NE NE NE NE NE NE NE NE 110000 0.9 5.8 580 63 45 3 NE NE 3.8 0.9 Location ID Sample Collection Date Analytical Results Background Sediment Samples SW-14 06/25/2018 7.3 3.1 5.31 N NA 46.7 67.8 6.0 -46 H 13000 <0.95 1.5 56 0.35 2.7 j 0.081 j 820 6.9 j 17 4.9 SW-15 06/25/2018 9.1 7.9 13.6 N NA 36.9 35.4 5.5 -23 H 29000 <1 4.6 90 0.8 <5 0.12 j 1300 <27 32 17 SW-CFUP 05/20/2015 NA NA NA 23.2 NA NA 6.5 NA 302 <6.5 <6.5 2.8 0.076 <3.2 <0.78 44.3 <320 0.56 <6.5 SW-CFP 04/28/2015 NA NA NA 56.4 NA NA 6.8 NA 5810 <11.3 <11.3 62.5 0.42 j <28.3 <1.4 1080 <558 9.9 7.6 j Downgradient Cooling Pond Sediment Samples SW-01C 04/28/2015 NA NA NA 21.8 NA NA 8.2 NA 623 <6.2 <6.2 14.3 <0.31 <15.5 <0.74 6680 <319 2.1 <6.2 SW-004 05/20/2015 NA NA NA 24.6 NA NA 6.9 NA 591 <6.4 <6.4 6.9 0.45 <3.2 <0.77 15700 <332 4.2 <6.4 SW-06A 05/20/2015 NA NA NA 28.1 NA NA 6.6 NA 328 <6.8 4.6 j 61 0.073 1.7 j <0.82 43400 <344 0.79 <6.8 SW-08A 05/20/2015 NA NA NA 27.9 NA NA 6.9 NA 312 <7.2 <7.2 90.4 0.047 j <3.6 <0.86 145000 <347 0.82 <7.2 SW-01 06/25/2018 <1 1.3 2.25 N NA 76.5 68.9 6.7 -104 H 120 <0.55 0.7 2.5 <0.11 <2.8 <0.14 85 j 14 0.4 j <0.77 SW-02 06/25/2018 <1 0.4 0.69 N NA 75.6 75.9 6.5 -130 H 180 <0.55 0.85 2.3 <0.11 <2.7 <0.14 55 j 9.7 j 0.41 j <0.76 SW-03 06/25/2018 <1 0.2 0.28 N NA 80.3 74.4 7.1 -98 H 140 <0.52 <0.52 1.8 <0.1 <2.6 <0.14 92 j 16 0.26 j <0.73 SW-04 06/25/2018 <1 1.6 2.77 N NA 76 75.1 6.8 -165 H 280 <0.61 14 4 <0.12 <3.1 <0.16 120 j 15 0.66 0.69 j SW-05 06/25/2018 <1 0.2 0.28 N NA 76.8 73.7 6.9 -146 H 190 <0.53 0.73 2.1 <0.11 <2.7 <0.14 51 j 11 j 0.48 j <0.75 SW-06 06/25/2018 <1 0.2 0.36 N NA 79.4 72.4 6.1 -135 H 140 <0.56 12 1.3 j <0.11 <2.8 <0.15 <280 8.8 j 0.37 j 0.94 SW-07 06/25/2018 <1 0.3 0.47 N NA 70.9 75.5 6.7 -167 H 840 <0.63 2.3 12 0.064 j <3.1 <0.16 190 j 13 j 1.2 0.58 j SW-08 06/25/2018 2.8 1.5 2.66 N NA 53 70.9 7.5 -166 H 2500 <0.87 0.99 46 0.076 j 3.9 j <0.23 17000 M 20 2.9 0.92 j SW-09 06/25/2018 1.5 1.1 1.9 N NA 72.2 66 7.8 -134 H 1800 <0.54 0.68 30 0.075 j 1.3 j <0.14 12000 12 j 1.8 0.68 j SW-10 06/26/2018 5.9 0.7 1.15 N 0.74 63.2 99.3 H 6.9 330 H 3100 <0.68 3.1 110 0.14 1.6 j 0.039 j 21000 4.1 j 8.1 1.1 SW-11 06/25/2018 4.9 16.1 27.8 N NA 17.1 17 6.4 -114 H 30000 1.9 j 38 150 1.6 <13 0.9 4400 150 37 19 SW-12 06/25/2018 5.1 9.4 16.2 N NA 23.8 22.7 6.9 -134 H 31000 <1.7 12 190 1.3 5.6 j 0.47 4600 62 39 18 SW-13 06/25/2018 4.5 11.8 20.3 N NA 23.8 28.8 7.1 -126 H 22000 1 j 27 160 1.4 3.6 j 0.46 4300 130 27 15 Downgradient Cape Fear River Sediment Samples SW-17 04/02/2020 1 1.3 2.16 N NA 77.7 77.5 6.0 197 1000 M <0.64 <0.64 4.9 <0.13 <2.9 <0.17 160 j <13 1.1 <0.9 SW-CF001 04/29/2015 NA NA NA 64.9 NA NA 6.1 NA 6590 <13.7 <13.7 18.1 0.46 j <34.4 <1.6 1520 <712 13.6 <13.7 Notes: 0- Bold highlighted concentration indicates exceedance of the Inactive Hazardous Sites Branch PSRG Table (May 2019) for Protection of Groundwater. < - Concentration not detected at or above the adjusted reporting limit. ^ - PSRG POG Calculated H - Sample analyzed past the recommended holding time. j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit. M - Matrix spike / matrix spike dup failure. meq/100g - milliequivalents per 100 grams mg/kg - milligrams per kilogram my - millivolts N - Analyte not National Environmental Laboratory Accreditation Conference (NELAC) certified. NA - Not Analyzed NE - Not established PSRG - preliminary soil remediation goals S.U. - standard units Page 1 of 2 TABLE 5-5 SEDIMENT CONCENTRATIONS OF COIs - SA1 AND SA2 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter Copper Iron Lead Magnesium Manganese Mercury Molybdenum Nickel Nitrate (as N) Potassium Selenium Silver Sodium Strontium Sulfate Sulfide Thallium Total Organic Carbon Vanadium Zinc Reporting Units mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg PSRG Protection of Groundwater 700 150 270 NE 65 1 7.1 130 NE NE 2.1 3.4 NE 1500 NE NE 0.28 NE 350 1200 Location ID Sample Collection Date Analytical Results Background Sediment Samples SW-14 06/25/2018 9.4 10000 8.2 1100 170 0.092 j <3.8 5 <0.43 820 <2.5 <0.95 <470 9.4 <21 <53.5 0.089 j 60600 25 37 SW-15 06/25/2018 16 29000 24 2000 620 0.19 j 1.4 j 11 <0.54 1100 <2.6 <1 110 j 16 <27 <61.1 0.2 j 64000 66 56 SW-CFUP 05/20/2015 0.26 j 1180 <6.5 <32.3 17.4 <0.011 <0.65 0.66 <32 <323 <6.5 NA <64.7 0.46 j <320 NA <6.5 772 j <6.5 4.8 SW-CFP 04/28/2015 7.8 10900 8.3 j 801 414 0.042 <5.7 4 <55.8 310 j <11.3 NA <567 9.7 <558 NA <11.3 32300 19.5 50.5 Downgradient Cooling Pond Sediment Samples SW-01C 04/28/2015 5.6 1460 <6.2 669 65.7 <0.01 <3.1 3.5 <31.9 <310 <6.2 NA <310 17.8 <319 NA <6.2 1360 4.8 j 5.1 j SW-004 05/20/2015 8.1 949 <6.4 27.2 j 5.1 <0.01 3.4 1.3 <33.2 68.5 <6.4 NA 154 64.4 <332 NA <6.4 1420 12.5 4.9 SW-06A 05/20/2015 15.8 1070 <6.8 88.6 161 0.0053 j 0.7 3.6 <34.4 <340 <6.8 NA 201 j 252 <344 NA <6.8 4010 5.8 j 4.6 SW-08A 05/20/2015 11.6 992 <7.2 47.4 ill <0.011 0.42 j 2.2 <34.7 <358 <7.2 NA 790 862 <347 NA <7.2 1630 4.3 j 4.5 SW-01 06/25/2018 2.6 360 0.95 <280 4.1 <0.1 <2.2 <2.2 <0.26 <280 <1.4 <0.55 <280 1.2 41 <34.8 <0.14 4880 2.9 0.78 j SW-02 06/25/2018 2.9 650 1.1 <270 4.9 <0.098 <2.2 <2.2 <0.26 <270 <1.4 <0.55 <270 1 j 23 <31 <0.14 5340 3.7 1.3 j SW-03 06/25/2018 2.1 220 0.75 <260 3.3 <0.1 <2.1 <2.1 <0.25 <260 0.52 j <0.52 <260 1.3 65 23.2 j <0.14 2860 1.3 j 1 j SW-04 06/25/2018 2.9 4600 0.58 <310 27 <0.097 33 <2.5 <0.26 <310 <1.6 <0.61 <310 3.7 24 <32.9 <0.16 2520 15 3.4 SW-05 06/25/2018 2 570 0.45 <270 11 <0.094 1 0.57 j <2.1 <0.26 <270 <1.4 <0.53 <270 1.2 20 <30.7 <0.14 2720 2.7 1.3 j SW-06 06/25/2018 2.2 1400 0.55 <280 3.8 <0.091 2.9 <2.3 <0.25 <280 <1.5 <0.56 <280 0.74 j 200 <30.6 <0.15 1730 9.4 1.9 j SW-07 06/25/2018 9.2 1400 1 1 51 j 22 <0.11 0.72 j 1.4 j <0.28 94 j <1.6 <0.63 <310 5.9 22 <32.9 0.056 j 3560 3.9 3.6 SW-08 06/25/2018 6 2100 1.1 1300 80 <0.15 <3.5 3.4 j <0.38 210 j <2.3 <0.87 <440 47 M 21 <37.1 0.092 j 6850 8 6 SW-09 06/25/2018 1.7 1400 0.84 860 55 <0.1 <2.2 2.1 j <0.28 140 j <1.4 <0.54 <270 22 24 <38 0.078 j 5980 5.7 2.4 j SW-10 06/26/2018 14 3300 1.2 1600 62 <0.11 <2.7 6.5 <0.32 220 j <1.8 <0.68 <340 24 <16 <33.2 <0.18 23500 9.1 15 SW-11 06/25/2018 520 24000 24 1700 170 0.22 j 20 88 <1.2 1100 j 17 <2.6 160 j 61 96 <146 2.6 223000 160 100 SW-12 06/25/2018 130 28000 20 2600 640 0.14 j 3.4 j 30 <0.84 1500 7 <1.7 <870 51 360 <93.4 0.7 116000 90 120 SW-13 06/25/2018 260 20000 1 17 1300 430 0.17j 9.3 66 <0.84 1000 12 <1.7 130j 68 630 <82.2 1.2 161000 100 84 Downgradient Cape Fear River Sediment Samples SW-17 04/02/2020 0.68 950 0.85 M 80 j 42 <0.1 <2.3 <2.3 0.34 j 75 j <1.7 <0.57 <290 1.6 <13 <0.1 0.064 j,M 1100 1.1 j 3.7 SW-CF001 04/29/2015 11.8 11700 17.4 1000 226 0.064 <6.9 5.8 <71.2 405 j <13.7 NA <687 13.8 <712 NA <13.7 68600 35.1 26.4 Notes: 0- Bold highlighted concentration indicates exceedance of the Inactive Hazardous Sites Branch PSRG Table (May 2019) for Protection of Groundwater. < - Concentration not detected at or above the adjusted reporting limit. ^ - PSRG POG Calculated H - Sample analyzed past the recommended holding time. j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit. M - Matrix spike / matrix spike dup failure. meq/100g - milliequivalents per 100 grams mg/kg - milligrams per kilogram my - millivolts N - Analyte not National Environmental Laboratory Accreditation Conference (NELAC) certified. NA - Not Analyzed NE - Not established PSRG - preliminary soil remediation goals S.U. - standard units Prepared by: BER Checked by: WJW Page 2 of 2 TABLE 5-6 REMEDIAL TECHNOLOGY SCREENING SUMMARY - SA1 AND SA2 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Summary of Remedial Technology Retain Technology for Further Consideration Screening Technology Yes/No Rationale COIs pose no unacceptable risk to human health or the Monitored Natural Attenuation (MNA) Yes environment under conservative exposure scenarios and could be implemented in conjunction with post - excavation effectiveness monitoring. In -Situ Technologies Low Permeability Barriers No Technically challenging and costly. The high conductivity of the surficial aquifer already Groundwater Flushing No promotes groundwater flushing in the area. Additional, targeted flushing is not anticipated. Commonly used technology to return aquifer to oxic conditions. This technology is not considered for alternatives because active remediation technologies are Air Sparging Yes not included in the alternatives. However, the technology is retained for possible future use if continued monitoring determine active remedial measures are needed as part of a contingency plan. Encapsulation No The source (ash) has been excavated from the 1971 and 1984 ash basins, so encapsulation is not applicable. High hydraulic conductivities and high groundwater flow velocities characterize the surficial flow zones. PRBs are Permeable Reactive Barrier (PRB) No not effective for areas with high conductivity and groundwater velocity. The PRB width in order to provide sufficient contact time with the reactive media would be cost prohibitive and impractical. Groundwater Extraction Technologies Vertical Extraction Wells Yes Commonly used technology for groundwater extraction; already applied and effective at the Site. Not warranted, vertical extraction well system is Horizontal/Angular Extraction Wells No operating as designed. No additional groundwater extraction wells are proposed. Constructing an extraction trench to sufficient depth to intercept affected groundwater would be technically challenging. The target depth would beyond the Extraction Trenches No capabilities of conventional excavation equipment. Additionally, at the target depth of 50 ft bgs, the sand adjacent to the trench would be prone to collapse and flowing into the excavated trench. Hydraulic Fracturing No Not warranted, no bedrock has been encountered within the depth of impact at the Sutton facility. The flow rate and depth of COIs at the site does not Phytoremediation No warrant the use of tree wells. TreeWellSTm are most effective for low conductivity aquifers. pH Adjustment Yes Retained for remedial alternatives that include groundwater extraction. Page 1 of 2 TABLE 5-6 REMEDIAL TECHNOLOGY SCREENING SUMMARY - SA1 AND SA2 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Summary of Remedial Technology Retain Technology for Further Consideration Screening Technology Yes/No Rationale Precipitation Yes Retained for remedial alternatives that include groundwater extraction. Ion Exchange Yes Retained for remedial alternatives that include groundwater extraction. Membrane Filtration Yes Retained for remedial alternatives that include groundwater extraction. Management of Extracted Groundwater NPDES Permitted Discharge Yes Extracted groundwater is currently discharged at Outfall SW-001. Publicly Owned Treatment Works (POTW) No Would require installation of infrastructure; NPDES is a better option. The COI concentrations do not warrant use of an Non -Discharge Permit/Infiltration Gallery No infiltration gallery for disposition of potential extracted groundwater since NPDES discharge or land application are possible and less costly. Non -Discharge Permit/Land Application No Will not be considered as long as disposal via NPDES outfall is a viable option. Beneficial Reuse of Extracted Groundwater The L.V. Sutton Energy Complex is still operating as a Fire Protection Yes combined cycle natural gas burning facility, so beneficial reuse of extracted groundwater is applicable. The L.V. Sutton Energy Complex is still operating as a Non -Contact Cooling Water Yes combined cycle natural gas burning facility, so beneficial reuse of extracted groundwater is applicable. The L.V. Sutton Energy Complex is still operating as a Dust Suppression and Truck Wash Yes combined cycle natural gas burning facility, so beneficial reuse of extracted groundwater is applicable. Notes: bgs - below ground surface COI - constituent of interest ft - feet MNA - monitored natural attenuation NPDES - national pollutant discharge elimination system POTW - publicly owned treatment works PRB - permeable reactive barrier Prepared by: WJW Checked by: GTC Page 2 of 2 TABLE 5-7 EXTRACTION WELL GROUNDWATER ANALYTICAL RESULTS CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter FIELD PARAMETERS ANALYTICAL RESULTS (TOTAL CONCENTRATION) pH Water Level Temp Specific Conductance Dissolved OxygenReduction Oxidation Potential Eh Turbidity Arsenic Boron Molybdenum Selenium Strontium Reporting Units S.U. ft Deg C Nmhos/cm mg/L mV mV NTUs Ng/L Ng/L Ng/L Ng/L Ng/L 15A NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE 30 700 NE 20 NE BTVs (Upper Surficial Flow Layer) 4.1 - 7.3 NE NE NE NE NE NE NE 2 50 1 1 71 BTVs (Lower Surficial Flow Layer) 5.1 - 7.3 NE NE NE NE NE NE NE 14 1 50 1 1 167 Sample Identification Sample Collection Date Analytical Results SUT-EW-01 03/04/2020 5.3 NM 20 97 9.45 324 529 0.1 <1 90 <1 <1 73 SUT-EW-02 03/04/2020 5.2 NM 20 188 8.72 344 549 0.2 <1 154 0.113j <1 148 SUT-EW-03 03/04/2020 6.2 NM 21 171 8.90 294 499 0.2 <1 181 1.32 0.424j 143 SUT-EW-04 03/04/2020 6.0 NM 21 351 7.41 309 514 1.1 <1 190 3.71 <1 283 SUT-EW-05 03/04/2020 6.2 NM 21 285 9.35 312 517 1.3 0.788j 264 7.28 <1 227 SUT-EW-06 03/04/2020 5.7 NM 21 207 4.93 337 542 0.3 <1 291 8.54 0.37j 256 SUT-EW-07 03/04/2020 5.8 NM 20 216 9.03 300 505 1.8 <1 259 5.53 <1 220 SUT-EW-08 03/04/2020 5.7 NM 20 209 5.16 279 484 1.7 0.52j 290 0.653j <1 177 SUT-EW-09 03/04/2020 5.8 NM 7 20 121 6.05 207 412 0.2 1 <1 65 <1 <1 55 Prepared by: BER Checked by: LWD Notes: 0 bold highlighted concentration indicates value is greater than the 15A NCAC 02L .0202 Standard or the IMAC. (Effective date for 15A NCAC 02L .0202 Standard and IMAC is April 1, 2013) 0 BTVs are presented for informational purposes only. The extraction wells presented in this table are screened across multiple flow zones. < - concentration not detected at or above the adjusted reporting limit. pg/L - Micrograms per liter BTVs - Background threshold values Deg C - Degrees Celsius EF, - Redox Potential ft - Feet IMAC - Interim Maximum Allowable Concentration j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit. mg/L - Milligrams per liter mV - Millivolts NCAC - North Carolina Administrative Code NE - Not established NM - Not measured NTU - Nephelometric turbidity unit S.U. - Standard Unit Temp - Temperature pmhos/cm - Micro mhos per centimeter Page 1 of 1 TABLE 5-8 SUMMARY TREND ANALYSIS RESULTS FOR GROUNDWATER MONITORING WELLS - SA1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC 04 ARCAD IS I fibmrEtt" "L� Reporting Unit P9/L Ng/L mg/L Ng/L Ng/L Ng/L SU Ng/L mg/L mg/L Ng/L Ng/L mg/L mg/L mg/L Ng/L mg/L mg/L Ng/L mg/L mg/L 02L or IMAC Criterion 10 700 250 10 300 50 6.5-8.5 20 250 500 1 0.3 NA NA NA NA NA NA NA 40 4 Upper Surficial BTV 1.56 50 5.5 0.055 6270 112.7 4.1-7.3 1 15 64 3.49 1.96 20 8.12 0.53 1 0.83 3.08 71 5 0.24 Lower Surficial BTV 14 50 30 0.1 28300 744 5.1-7.3 SO 22 880 7 2 165 68 3 1 5 13 167 5 0.5 Upper Surficial Wells At or Beyond Compliance Boundary AW-08B ND ND S NE D S D ND S ND S S ND S S ND S S S NE NE BMW-01 ND ND S NE NT NT D NT D NT ND NE ND D NT ND NT NT NE ND ND BMW-03 ND ND NT NE NE NE S ND I I NT NE ND I [25.7] NT NT I [17] I [8.19] NE ND D DMW-03 ND ND NT NE NE NE I ND I I ND NE ND I [52.4] I [1.19] ND I [5.45] I [8.19] NE ND D DMW-04 ND I D NE NE NE D ND NT NT ND NE NT NT D NT NT NT NE ND ND MW-22B ND ND S S ND S S ND D ND ND ND ND D D ND S 5 D ND ND MW-23B ND ND NT NT NT NT S D I I ND NT I [75.7] I [49.6] S D NT I [4.94] S ND S MW-24B/RB ND ND NT NT D D D ND NT NT ND ND D D NT ND NT NT D ND S MW-27B ND NT D NT NT NT S D D D NT ND ND D D ND D D D ND ND MW-38B ND ND 5 ND NT NT S ND 5 ND ND 5 ND I I ND S I S ND S MW-39B ND ND D ND S S S ND ND S ND NT S S S ND S S S ND ND SMW-0113 ND NT NT ND NT NT S ND NT NT ND ND NT NT NT ND NT NT NT ND ND SMW-02B ND ND D NE NT NT S ND NT S ND S S I S NT D NT D NE NE SMW-05B NT NT NT NE NT D S ND D S ND I [4.42] S 5 D NT NT NT NT ND NT SMW-06B ND S I S NT D I ND D I ND I [2.06] I [61.4] I [30.4] I [1.51] I (0.731) D D I [80] ND ND Lower Surficial Wells At or Beyond Compliance Boundary AW-02C ND I I ND D D D ND I S ND NT ND I S NT D I S ND S AW-04C ND D D ND D D D ND D D D NT NT D D NT D D D ND ND AW-08C ND I NT NT D NT S ND S I D NT ND NT S ND I I S ND ND AW-09C ND D D NT D D D ND D D ND D ND D D ND D D D ND ND CCR-202C D D D NE NE NE D ND S S NT NE D S D ND S D NE ND ND CCR-203C ND D D NE NE NE I NT D D NE 5 D D I [49.2] D D NE ND ND CCR-204C ND D NT NE NE NE D ND NT S ND NE D S D ND I I [13.1] NE ND ND MW-07C ND NT NT NT NT NT D ND NT NT NT ND NT NT ND S NT NT ND S MW-11 ND ND I NT NT I S ND I S ND NT ND I I ND NT I I ND S MW-12R I D D ND I [298001 NT I ND NT NT I [9.3] NT I [270] NT NT I [49.2] S NT D ND ND MW-16D NT I[709] D ND D S S ND D D D D ND D S ND S D S ND MW-19 D D D S D S D ND D D D S D D D D D D D ND ND MW-21C D D D ND D D D ND D D D NT D D D D D D D ND NT MW-22C ND D D ND D D D ND D D D ND D D D D D D D ND ND MW-23C ND D D I NT D D D D D I [22.4] S D D D D D D D ND ND MW-24C/RC ND NT NT NT D D S ND NT NT I NT NT NT NT NT NT NT NT ND ND MW-27C ND D D S NT D S D D D D NT ND D D ND D D D NT ND MW-33C ND ND 5 ND D D S ND NT I ND D ND NT NT ND I (3.42) NT NT ND ND MW-38C ND D D I D D D D D D D NT ND D D ND D D D ND ND MW-39C NT ND 5 ND D NT D ND I S NT I [3.76] ND NT NT ND S D NT ND ND SMW-01C ND S NT ND NT S S ND S S NT NT ND S S ND S S S ND ND SMW-02C ND NT NT ND NT I[2770] S ND S S NT D NT I S ND D NT NT ND ND SMW-03C ND D D ND NT D S ND D S D D ND S D ND D D D ND ND SMW-04C ND NT NT ND D NT D ND S NT S D ND S NT ND D NT S ND ND SMW-05C ND D D ND D NT S ND D D D ND ND S D ND D D D ND ND SMW-06C ND D D ND D D D ND 5 D D NT ND D D ND NT 5 D ND ND Upper Surficial Wells Between Waste Boundary and Compliance Boundary BMW-04 ND ND NT NE NE NE 5 ND I (150) I (443) ND NE I [200] I [125] NT I [65.9] I [7.92] I [13] NE ND ND CCR-109B I [58.5] D D NE NE NE S ND D NT NT NE D NT NT I [48.7] NT D NE NT S CCR-110B NT 5 5 NE NE NE D ND 5 5 ND NE I [130] I [72.1] I [12.7] NT I [26.3] I [93.7] NE ND ND CCR-111B I[290] D NE NE NE I ND D D ND NE I[390] I[115] I[37.9] NT S D NE NT I CCR-112B NT D NE NE NE S ND D D D NE 5 D D NT D 5 NE S 5 CCR-113B NT D NT NE NE NE S ND NT NT D NE D S NT NT S NT NE D D CCR-114B ND D I NE NE NE S ND NT D ND NE D D D D D NT NE ND ND CCR-115B ND ND S NE NE NE D D I NT ND NE D NT NT D NT I [7.19] NE D S CCR-116B ND ND I NE NE NE D ND NT I I [6.91] NE NT I [22.1] I [1.34] D NT I [12] NE ND ND CCR-117B ND ND I NE NE NE S 1(12.8) NT I ND NE I [99] I [46.9] I [0.987] D I [1.24] I [3.94] NE ND ND CCR-118B ND ND I NE NE NE D NT I I ND NE I [86] I [43.5] I [1.06] D I [1.57] I [5.13] NE ND ND CCR-119B ND S I NE NE NE D NT NT NT ND NE I [52] I [26.9] I [1.85] D NT I [7.54] NE ND ND CCR-120B ND NT I NE NE NE D ND I 5 ND NE NT I [50.2] 5 NT D I [9.86] NE ND DMW-01 ND ND D NE NE NE D ND I NT ND NE D D D ND I [7.79] NT NE ND ND DMW-02 ND ND I NE NE NE D ND I NT ND NE ND NT NT ND NT I [7.54] NE ND ND MW-36B ND NT S ND NT ND S D NT NT ND D S NT D D D D NE NE MW-40B ND NT NT ND NT NT S ND NT 5 S S S 5 D NT D D ND ND Page 1 of 2 TABLE 5-8 SUMMARY TREND ANALYSIS RESULTS FOR GROUNDWATER MONITORING WELLS - SA1 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC 04 ARCAD IS I ftEmrEtt" "L� Reporting Unit Pg/L pg/L mg/L Ng/L pg/L pg/L SU Pg/L mg/L mg/L Pg/L pg/L mg/L mg/L mg/L pg/L mg/L mg/L Pg/L mg/L mg/L 02L or IMAC Criterion 10 700 250 10 300 50 6.5-8.5 20 250 500 1 0.3 NA NA NA NA NA NA NA 40 4 Upper Surficial BTV 1.56 50 5.5 0.055 6270 112.7 4.1-7.3 1 15 64 3.49 1.96 20 8.12 0.53 1 0.83 3.08 71 5 0.24 Lower Surficial BTV 14 50 30 0.1 28300 744 5.1-7.3 10 22 880 7 2 165 68 3 1 5 13 167 5 0.5 FPA-02B S S S S I NT S NT I S ND NT D S I [0.635] NT I [1.18] S S S ND FPA-03B NT S S ND D NT S ND S S S NT S S S S S S S S S FPA-04B ND ND I ND NT D S I I S NT 5 ND NT S NT I [1.64] NT S ND S FPA-09B I [18.8] S S NE NE NE D ND I (160) S ND NE S S S S S D NE S NT Lower Surficial Wells Between Waste Boundary and Compliance Boundary CCR-109C D S S NE NE NE S ND S D S NE D D S I[304] D S NE S S CCR-110C D I [2040] I NE NE NE D ND D S I [13.5] NE I (115) S I [16.7] D I [16.1] I [65.1] NE ND ND CCR-111C I[73.3] D D NE NE NE S ND D D S NE I(140) S S I[254] D D NE ND ND CCR-112C I D D NE NE NE 5 ND D D S NE D D D D D D NE ND ND CCR-113C I[16.8] D D NE NE NE S ND D D ND NE D D D D D D NE D S CCR-114C D D D NE NE NE I NT D D ND NE D D D D D D NE D ND CCR-115C NT D D NE NE NE D I [35.3] D D S NE D D D ND D D NE ND ND CCR-116C ND D D NE NE NE D D D D D NE D D D D D D NE ND ND CCR-117C ND D D NE NE NE D I D D S NE D D D D D D NE ND ND CCR-118C NT D D NE NE NE S ND NT D ND NE D D D D D D NE ND ND CCR-119C NT D D NE NE NE I ND D D D NE S D D NT D D NE ND ND CCR-120C ND I [1040] S NE NE NE D ND S S I [30.3] NE NT I I [9.45] ND 1(4.55) I [51.1] NE ND ND CCR-205C D D D NE NE NE S ND D D D NE D D D NT D D NE ND ND CCR-208C ND ND 5 NE NE NE S NT NT NT ND NE ND D NT ND NT NT NE ND ND MW-36C ND D D NT NT D S D D D D D D D D D D D D S ND MW-40C ND D D ND ND D S NT D D D 5 S D D NT D D ND ND FPA-02C NT S S ND S S S ND S S I NT S S S S S S S S FPA-03C I [32.7] S S ND S S S ND S S S S S S S S I [7.18] ENT I [604] S S FPA-04C I [15.3] NT NT ND NT D S ND NT D I I [5.45) S NT NT I [63.1] NT NT ND S FPA-09C S S NT NE NE NE D ND NT D I NE S NT NT S S NE S S Notes: Summary of results and trends are presented for samples collected from 2015 - 2020. Trend results are presented when at least four samples were available and frequency of detection was >50 % . Statistically significant trends are reported at the 95 % confidence level. Variability Index (VI) is calculated as the (maximum - minimum) / median concentration and is calculated using detected concentrations only. Values less than 1 indicate low variability in the dataset. For pH, statistically significant, increasing trend with a maximum recent result (2019 - 2020) greater than 8.5. Maximum detected result for 2018 and 2019 time period shown in parentheses. ND S NT I I (>0.5*Criterion) = Greater than 50 percent of constituent concentrations were non -detect = Statistically significant, decreasing concentration trend = Stable. No significant trend and variability is low (VI < 1) = No significant trend and variability is high (VI > 1) = Statistically significant, increasing concentration trend. = Statistically significant, increasing concentration trend with a maximum recent concentration (2019 - 2020) greater than 50 % of the relevant 02L, IMAC, or BTV criterion. Maximum detected concentration for 2019 and 2020 time period shown in parentheses. I [>Criterion] = Statistically significant, increasing concentration trend with a maximum recent concentration (2019 - 2020) greater than the relevant 02L, IMAC, or BTV criterion. Maximum detected concentration for 2019 and 2020 time period shown in brackets. NE = Insufficient number of samples to evaluate trend in < 4) Acronyms and Abbreviations: > = greater than < = less than <_ = less than or equal to 02L = 15A North Carolina Administrative code (NCAC) .02L standard BTV = background threshold value IMAC = interim maximum allowable concentration 15A NCAC .02L Appendix 1 mg/L = milligrams per liter n = sample size NA = not available SU = standard units VI = variability index Ng/L = micrograms per liter Source: Table 3, Plume Stability Evaluation - L.V. Sutton Energy Complex, ARCADIS 2020 (Appendix L) Page 2 of 2 TABLE 5-9 CONSTITUENTS OF INTEREST EVALUATION - SOURCE AREA 2 FORMER ASH DISPOSAL AREA AND FORMER COAL PILE AREA CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, INC G undwater L.V. Sutton Maximum n'oStatistically c of 15nt=tt5 Reporting 02L .1 Z Ri.k-B..ed C..V�PSutton Energy Energ Y NC Coastal Plain Con entraticm Groundwater Derived Background e. Flow Zone Complex Regional Near or Beneath Exceeclance A IMAC Clean-up Background Dataset Background Background (2018 CS Unit Value" Value Range Dartaset Update) Criterion Dataset Range Source Areas' Ratio4 Range Constituent Standards and Values - 02L Criterion Number of Wells Greater Than Comparative Criteria Near or C Bey n ompo ' nce Boundary Groundwater Monitoring WeC11o:ith COI Concentration Greater Than P rative CHI P. 7.1el 111 Is Flow Exceeds.,11I Exceeds R.1i ... I Downgradent of C..par.ti- Crit. Z'O'ne"" I, S-ce Area t ria Background B Spea ic Geachemical (mean of ash pore ackground Background Concentrations MobiliW Ran Greater than Criteria water from January Range 2015 to June 2019) Lines of Evidence (LOE) - 02L Criterion Rationale for Selection of COls for Corrective Action Evaluation mul(constituents where no means are greater than comparative criteria in all flow and/., Itiple lines of evidence support t at constituent occurrences are not related to the source areas, n corrective action is warranted) Rationale for Exclusion - 02L Criterion Upper Surficial 1 2 <1 - 2.11 115 11.5 4 MW-15RB, MW-438, MW-448, MW-48B Y Y Y Y Non -Conservative Yes; Concentrations greater than comparison criteria depict a plume -like distribution likely related to the source areas Arsenic pg/L SO 8.3 <1 - 2.11 0.335j - 14 Y Lower Surficial 3 14 <1 - 14 141 10.1 4 ABMW-0-, MW-94C, MW-45C, MW-49C Y Y Y Y Nan -Conservative Yes; Concentrations greater than comparison criteria depict a plume -like distribution likely related to the source areas Upper Surficial 50 50 5.99 - 65 207 0.0 0 Y Y N N Conservative No; No concentrations exceed comparison criteria beneath or downgradient of source area Boron pg/L 700 5,541 <50 - 65 17.168j - 4730 Y Lower Surficial 50 50 <50 1,290 0.2 0 Y Y N N Conservative No; No concentrations exceed comparison criteria beneath or downgradient of source area Upper Surficial 5 6 1.6 - 8.8 35 0.1 0 Y N N N Conservative No; No concentrations exceed comparison criteria beneath or downgradient of source area Chloride mg/L 250 NE 1.6 - 74 <0.1 - 1800 N Lower Surficial 18 30 2.6 - 74 78 0.3 0 Y Y N N Conservative No; No concentrations exceed comparison criteria beneath or downgradient of source area Upper Surficial 0.03 0.06 <0.025 - <0.12 0.13 0.004 0 Y N N N Variable No; No concentrations exceed comparison criteria beneath or downgradient of source area Chromium pg/L 10 37 <0.3 <0.025 - 24.6 N Lower Surficial 0.1 0.1 <0.025 - <0.3 0.07 0.00 0 N N N N Variable No; No concentrations exceed comparison criteria beneath or downgradient of source area (Hexavalent) Upper Surficial NE 0.2 0.0506j - <0.5 0.30 0.2 0 Y N N N Conservative No; No concentrations exceed comparison criteria beneath or downgradient of source area Fluoride mg/L 2 NE 0.0506j - <0.5 <0.1 - 3.4j N Lower Surficial NE 0.5 <0.1 0.67 0.3 0 Y Y N N Conservative No; No concentrations exceed comparison criteria beneath or downgradient of source area Upper Surficial 468 6270 9.16j - 6780 33,050 1.70 1 MW-43B Y Y N Y Variable No, only concentration greater than comparison criteria is in area contained within arsenic plume Iran pg/L 300 19,394 <10 - 30100 3.536j - 41400 Y Lower Surficial 9540 28300 <10-30100 9,631 0.3 0 N N N N Variable No; No concentrations exceed comparison criteria beneath or downgradient of source area Upper Surficial 43 113 3.378j - 114 328 0.7 0 Y N N N Variable No; No concentrations exceed comparison criteria beneath or downgradient of source area Manganese pg/L 50 484 3.378j - 972 2.961j - 1920 Y Lower Surficial 470 744 16 - 972 1,148 1.5 2 Mw-45C, MW-46C Y Y N Y Variable No, only concentrations greater than comparison criteria are in area contained within arsenic plume Upper Surficial 1 1 <1 1.29 0.01 0 Y Y N N Non -Conservative No; No concentrations exceed comparison criteria beneath or downgradient of source area Selenium pg/L 20 139 <1 0.334j - 1.84 N Lower Surficial 1 1 <1 <1 NE 0 Y N N N Nan -Conservative No; No concentrations exceed comparison criteria beneath or downgradient of source area Upper Surficial 16 15 4.2 - 140 404 1.6 1 MW-20 Y Y N Y Variable No, only concentration greater than comparison criteria is in area contained within arsenic plume. Not Sulfate mg/L 250 NE 0.82 - 140 2.961j - 1920 N detected at a concentration greater than 02L in ash pore water. Lower Surficial 19 22 0.82 - 74 88 0.4 0 Y N N N Variable No; No concentrations exceed comparison criteria beneath or downgradient of source area Upper Surficial 25 64 <0.1 723 1.4 1 MW-20 Y N N Y Conservative No, only concentration greater than comparison criteria is in area contained within arsenic plume. Not Total Dissolved Solids mg/L 500 NE <0.1 - 921 <25 - 3500 Y detected at a concentration greater than 02L in ash pore water. Lower Surfical 110 880 <25 - 927 400 0.5 0 N N N N Conservative No; No concentrations exceed comparison criteria beneath or downgradient of source area Constituents with IMAC Criterion Lines of Evidence (LOE) - IMAC Criterion Rationale for Exclusion - IMAC Criterion Upper Surficial 0.9 3 0.363j - 3.97 2.6 0.3 0 N N N N Variable No; No concentrations exceed comparison criteria beneath or downgradient of source area Cobalt pg/L 1 8 <3 - 12 0.349j - 16.6 N Lower Surficial 3 7 <1 - 12 9.0 1.1 1 MW-46C Y N N Y Variable No; Only one location with concentrations slightly greater than comparison Criteria Upper Surficial 0.3 2 0.16j - 2.63 74 0.9 0 Y Y Y N Nan -Conservative No; No concentrations exceed comparison criteria beneath or downgradient of source area Vanadium pg/L 0.3 87 <1 - 2.63 0.105j - 4.48 Y Lower Surficial 1 2 <1 - 1.96 2.33 0.0 0 Y N N N Non -Conservative No; No concentrations exceed comparison criteria beneath or downgradient of source area Background Criterion Lines of Evidence (LOE) -Background Criterion Rationale for Exclusion - Background Criterion Upper Surficial 5 20 <5 - 23.5 224 11.2 9 MW-15RB, MW-20, MW-44B, MW-45B, MW-46B, MW-47B, MW- y y N Y NA No, Water quality parameter commonly detected in regional groundwater, wells near source area are Alkalinity mg/L NE NE <5 - 195 <5 - 1060 4813, MW-4913, MW-5013 NA contained within arsenic plume Lower Surficial 68 165 6.1 - 195 272 1.6 2 ABMW-02n, MW-49C Y Y N Y NA No, Water quality parameter commonly detected in regional groundwater commonly detected in regional groundwater, wells near source area are contained within arsenic plume Upper Surficial 0.9 8.12 0.169 - 20.9 218 26.8 10 MW-15RB, MW-20, MW-4313, MW-4913, MW-4513, MW-4613, MW- y Y N Y Conservative No, Water quality parameter commonly detected in regional groundwater commonly detected in regional 47B, MW-48B, MW-49B, MW-50B groundwater, wells near source area are containedwithin arsenic p ume Calcium mg/L NE NE 0.169 - 80.1 0.169 - 235 NA Lower Surficial 18 68 1.36 - 80.1 83.1 1.2 2 ABMW-02n, MW-49C Y Y N Y Conservative No, Water quality parameter commonly detected in regional groundwater commonly detected in regional groundwater, concentrations greater than comparison criteria are within FADA excavated footprint Upper Surficial NE 5 2.006j - <5 20 0.4 0 Y Y N N Conservative No; No concentrations exceed Comparison criteria beneath Or downgradient of Source area Lithium pg/L NE 55 2.006j - 6 1.682j - 863 NA Lower Sur icial NE 5 2.248j - 6 102 1.9 1 MW-49C Y Y N Y Conservative L No, Anomalous concentration greater than comparison criteria in area that is now excavated TABLE 5-9 CONSTITUENTS OF INTEREST EVALUATION - SOURCE AREA 2 FORMER ASH DISPOSAL AREA AND FORMER COAL PILE AREA CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC _Gl*undwater L.V. Sutton Maximum n a cjall C �PSutton Energy Energy NC Coastal plain t t. L.V C ... entration Groundwater Z, Zone Statistically Rsk-B.Sed Z - LBk nd Flo Z of Interest Reporting LDe e d a c one Complex R. giona (2018 CSA Unit IMAC Derived B ckground Near or Beneath Exceeclance Clean-up Background Dat Back round Background Update) Criterion Value" Value Range aset Datgaset Dataset Ranges Non-CAMA Ratio4 Range Source AreaS7 Background Criterion (Continued) Number of Wells Greater Than Comparative Groundwater Monitoring Well.:ith COI Criteria Near or Concentration Greater The. Co P rative Beyond Criteria S,6 Complianc Boundary Pr,�.n"ern.Ab,.I�p Dowingradient of . V.—cls H.. Exce.d,.,Iile- Exceeds Regional Comparative Criteria Zone Backgr und B Sp' C. it Source Area at Background Geochernical MobiliW (mean of ash pore 0 ackgrouno Concentrations Value Range water from January Range Greater than Criteria 2015 to June 2019) Lines of Evidence (LOE) -BackliIIII ground Criterion (Continued) I Rationale for Selection of COls for Corrective Action Evaluation mu(constituents where no means are greater than comparative criteria in all flow zones and/or Itiple lines of evidence support t at constituent occurrences are not related to the source areas, oh n corrective action is warranted) Rationale for Exclusion -Background Criterion (continued) Upper Surficial 0.5 0.5 0.096 - 6.56 12 14.1, 11 MW-15RB, MW-16, MW-20, MW-43B, MW-448, MW-45B, MW- y N N y Conservative No, Water quality parameter commonly detected in regional groundwater, wells near source area are Magnesium mg/L NE NE 0.096 - 972 0.068 - 26.2 4613, MW-4713, MW-4813, MW-4913, MW-5013 NA contained within arsenic plume Lower Surficial 3 3 16 - 972 26.2 8.7 12 ABMW-02D, MW-1511C, MW-16D, MW-20D, MW-43C, MW-MC, y N N Y Conservative No, Water quality parameter commonly detected in regional groundwater, wells near source area are MW-45C, MW-46C, MW-47C, MW-48C, MW-49C, MW-50C contained within arsenic plume Upper Surficial 1 1 0.091j - <1 20.7 0 0 y y N N Variable No; No concentrations exceed comparison criteria beneath or downgradient of source area Molybdenum pg/L NE 139 <1 - 1.27 0.091j - 43.7 NA Lower Surficial 1 1 <1 - 1.27 79 0.6 0 y Y Y N Variable No; No concentrations exceed comparison criteria beneath or downgradient of source area Upper Surficial 0.7 0.8 0.388j - 33.8 8.0 10.1 11 MW-15RB, MW-I6, MW-20, MW-436, MW-448, MW-45B, MW- y N N y Conservative No, Contained within arsenic plume and no established regulatory standard Potassium mg/L NE NE 0.388j - 33.8 0.1 - 359 4613, MW-4713, MW-4813, MW-4913, MW-506 NA Lower Surficial 0.5 5 0.665 - 4.98 11.6 2.3 7 ABMW-0213, MW-44C, MW-45C, MW-46C, MW-47C, 14W-48C, MW-49C y N N Y Conservative No, Contained within arsenic plume and no established regulatory standard Upper Surficial 3 3 0.872 - 7.51 28.7 9.6 11 MW-15RB, MW-I6, MW-20, MW-43B, MW-44B, MW-45B, MW- y y N y Conservative No, Contained within arsenic plume and no established regulatory standard Sodium mg/L NE NE 0.872 - 14.5 0.872 - 1320 4613, MW-4713, MW-4813, MW-4913, MW-5013 NA Lower Surficial 13 13 1.88 - 14.5 67.1 5.2 11 ABMW-021), MW-1511C, MW-16D, MW-201), MW-MC, MW-45C, MW-46C, MW-47C, MW-48C, MW-49C, MW-SOC y Y N Y Conservative No, Contained within arsenic plume and no established regulatory standard Upper Surficial 8 71 3.497j - 85 821 0.05 0 y y N N Variable No; No concentrations exceed comparison criteria beneath or downgradient of source area Strontium pg/L NE 16,623 3.497j - 171 3.497j - 827 NA Lower Surficial 45 167 10 - 171 2,200 0.13 0 Y Y Y N Variable No; No concentrations exceed comparison criteria beneath or downgradient of source area Motel: 0 - Reference Criterion 0-'id enca'"'ports indpsion - Evidence supports exclusion ' - Constituent list reflects the COI list identified in the CSA Update (SynTerra, 2018) '- Updated Background Values include Groundwater Data Collected Through 1118 (Draft SynTerra, March 2019). 3 - The following wells were used to calculate geomean ash pore water concentrations: ABMW-OIS, ABMW-02S - The exceedance ratio is the rati" of the oboe,cd constituent c"ncen-ti"n divided by the reference criterion s - The following upper su racial flow zone wells were used to calculate geomean groundwater concentrations near or beyond the compliance boundary: MW-ISRB, MW-16, MW-20, MW-43B, MW-44B, MW-45B, MW-46B, MW-47B, MW-48B, MW-49B, MW-SOB - The following lower surflcial flow zone wells were usetl m calculate geomean groundwater c"ncentrations near or beyond the compliance boundary: ABMW-02D, MW-15RC, MW-16D, MW-20D, MW-43C, MW-44C, MW-45C, MW-46C, MW-47C, MW-48C, MW-49C, MW-50C - Maximum concentration refers to maximum LCL95 or C— Refer to Table 5-14 for the full dataset The coastal plain regi"nal background tlataset is comprised of Me backgr"und tlataset for all flow zones at H.F. Lee, Sutton, and Weathempoon facilities pg/Icoentrati"n not detected at or above the adjusted reporting limit micrograms per liter 02L - NCAC Title 15A, Subchapter 02L. Groundwater Classification and Standards COI - constituent of Interest CSA - Comprehensive Site Assessment M- central tendency value FADA - Former Ash Disp"'al Area IMAC - interim maximum allowable concentration j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit Ukg - liters per kilogram LCL95 - 95% lower confidence limit mg/I = milligrams per liter NA - not applicable NE - not established TABLE 5-10 SUMMARY OF INTERIM ACTIONS - SOURCE AREA 2 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Groundwater and Surface I Groundwater and Surface Water Remedy Water Interim Actions Excavation of ash from the Former Ash Disposal Area began in 2019 and was completed in June 2020. Excavation below the water table was conducted. The standing water in the area is retained within the Former Ash Disposal Area by earthen dams and steel Removal of Source Material sheet piling. Coal has not been stored on Site since 2013, when the coal-fired units were decommissioned. Results of the Former Coal Pile Area assessment, conducted in the summer of 2019, are included as Appendix M. Prepared by: LWD Checked by: EMY Page 1 of 1 TABLE 5-11A SUMMARY OF UNSATURATED SOIL ANALYTICAL RESULTS - SOURCE AREA 2 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter pH Arsenic Boron Calcium Chloride Chromium (VI) Cobalt Iron Magnesium Manganese Molybdenum Potassium Selenium Sodium Strontium Sulfate Vanadium Reporting Units S.U. mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg PSRG Protection of Groundwater NE 5.8 45 225A 938A 3.8 0.9 150 1S 65 7.1 91A 2.1 131A 1500 1 438A 350 2020 Updated Background Threshold Values 4.8 - 6.7 1.8 3 290 275 NE 1.2 2533 290 13 2.4 290 1.9 290 1 275 11 Sample ID Depth Interval (FEET BGS) Sample Collection Date Analytical Results Background Soil Samples BGSB-01 (0.5-1.0) 0.5 - 1 08/23/2017 6.2 0.22 j <2.4 <240 <12 NA <0.73 38 <240 2 <1.9 <240 <1.3 M <240 <0.96 <12 1.6 B BGSB-01 (2.0-3.0) 2 - 3 08/23/2017 6.0 0.35 j <2.6 <260 <11 NA <0.75 1000 <260 1.2 <2.1 <260 <1.4 <260 0.39 j <11 2.3 B BGSB-01 (4.0-5.0) 4-5 08/23/2017 6.7 0.24 j <2.7 <270 <11 NA <0.5 780 <270 2.1 <2.2 <270 <0.92 <270 0.43 j <11 1.8 B BGSB-02 (0.5-1.0) 0.5 - 1 08/23/2017 5.3 0.12 j <2.9 <290 <16 NA <0.84 33 <290 0.42 j <2.3 <290 <1.6 <290 <1.2 <16 0.95 j,B BGSB-02 (2.0-3.0) 2 - 3 08/23/2017 5.2 0.17 j <2.4 <240 <14 NA <0.8 16 <240 0.4 j <1.9 <240 <1.5 <240 <0.95 <14 1.1 j,B BGSB-02 (4.0-5.0) 4-5 08/23/2017 5.4 0.074 j <2.4 <240 <11 NA <0.41 25 <240 0.82 <1.9 <240 <0.75 <240 <0.96 <11 0.65 j,B BGSB-03 (0.5-1.0) 0.5 - 1 08/23/2017 4.8 0.12 j <2.5 <250 <10 NA <0.48 16 <250 0.72 j <2 <250 <0.89 <250 <1 <10 0.89 B BGSB-03 (2.0-3.0) 2 - 3 08/23/2017 5.2 0.45 j <2.9 <290 <13 NA <0.66 1100 <290 1.4 <2.4 <290 <1.2 <290 0.48 j <13 3.9 B BGSB-04 (0.5-1.0) 0.5 - 1 08/23/2017 5.1 0.5 <2.5 39 j 1.6 j NA 0.49 j 1800 73 j 3.5 <2 35 j <0.96 <250 0.79 j 20 5.3 B BGSB-04 (2.0-3.0) 2 - 3 08/23/2017 5.0 0.54 <2.4 <240 <10 NA 0.22 j 1900 110 j 4.7 <1.9 66 j <1.1 <240 1.2 <10 5 B BGSB-04 (4.0-5.0) 4-5 08/23/2017 5.1 0.36 j <2.1 <210 <13 NA 0.32 j 810 39 j 2.8 <1.7 <210 <1.4 <210 0.44 j <13 2.5 B BGSB-05 (0.5-1.0) 0.5 - 1 08/23/2017 5.2 0.44 j <2.5 <250 <10 NA <0.64 1400 <250 1.4 <2 <250 <1.2 <250 0.5 j <10 6.6 B BGSB-05 (2.0-3.0) 2 - 3 08/23/2017 5.1 0.55 j <3.4 <340 <14 NA <0.89 1600 70 j 2.8 <2.7 44 j <1.7 <340 0.74 j <14 4.6 B MW-37C (0-2) 0 - 2 02/04/2015 6.5 <1.1 <2.7 <26.9 <263 NA <1.1 57.9 <26.9 0.72 1 <0.54 <53.8 <1.1 <53.8 <0.54 <263 1 <1.1 MW-37C (4-6) 4-6 02/04/2015 5.3 <1.1 <2.8 <27.9 <275 NA <1.1 875 <27.9 3.9 <0.56 <55.7 <1.1 <55.7 <0.56 <275 <1.1 Former Ash Disposal Area Soil Samples MW-15RS6 (1-2) 1-2 07/11/2019 8.6 2.7 1.4 j 21000 <11 NA 0.66 j 2300 680 16 <2 160 j <1.3 47 j 68 <11 20 MW-15RSB (2-4) 2-4 07/11/2019 7.9 <0.55 <2.7 <270 <11 NA <0.77 43 <270 0.83 <2.2 <270 <1.4 <270 <1.1 <11 0.57 j Former Coal Pile Area Soil Samples MW-43SB (1-2) 1 -2 07/10/2019 4.9 13 <2.3 49 j <11 NA <0.66 6600 <230 4.4 1.8 j 150 j 0.9 j <230 5.3 150 850 MW-43SB (2-4) 2 - 4 07/10/2019 3.6 2.7 <2.2 41 j <11 NA <0.61 2700 <220 2.8 0.99 j 130 j 0.52 j <220 3.6 220 180 MW-44SB (3-5) 3 - 5 07/19/2019 5.9 <0.47 <2.4 180 j <11 NA <0.66 540 94 j 4.9 <1.9 130 j <1.2 <240 1.4 8.3 j 2.7 MW-46SB (1-2) 1-2 07/10/2019 6.2 0.25 j <2.4 120 j <11 NA <0.68 430 <240 5.9 <2 54 j <1.3 <240 1.5 <11 1.1 j MW-46SB (2-4) 2-4 07/10/2019 6.6 0.24 j <2.2 98 j <11 NA <0.63 330 <220 3 <1.8 33 j <1.2 <220 1 <11 0.66 j MW-50SB (1-2) 1-2 07/09/2019 6.0 1.3 <2.1 96 j 2.4 j NA 0.38 j 1800 26 j 6.9 <1.7 86 j <1.1 <210 2.6 <11 11 IL MW-50SB (2-4) 2-4 07/09/2019 6.5 <0.48 1 <2.4 65 j 1 2.4 j NA <0.67 25 <240 2.7 <1.9 <240 <1.2 <240 0.43 j 18 <1.2 Prepared by: WJW Checked by: JYT Notes: Revised by: LWD 0 - Bold highlighted concentration indicates exceedance of the Inactive Hazardous Sites Branch PSRG Table (May 2019) for Protection of Groundwater or the Background Threshold Value (BTV), whichever is higher. Updated background threshold values were calculated using data from background unsaturated soil samples collected January 2015 to August 2017. The background threshold value updates retained extreme outlier concentrations in background unsaturated soil datasets (SynTerra, 2019). < - Concentration not detected at or above the adjusted reporting limit. A - PSRG POG Calculated B - Target analyte detected in method blank at or above the reporting limit. Target analyte concentration in sample is less than 10X the concentration in the method blank. Analyte concentration in sample could be due to blank contamination. BGS - below ground surface j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit. M - Matrix spike / matrix spike dup failure. mg/kg - milligrams per kilogram NE - Not established PSRG - preliminary soil remediation goals S.U. - standard units NA - Not Analyzed Page 1 of 1 TABLE 5-11B SUMMARY OF UNSATURATED SOIL SPLP RESULTS - SOURCE AREA 2 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter Arsenic Boron Calcium Chloride Cobalt Iron Magnesium Manganese Molybdenum Potassium Selenium Sodium Strontium Sulfate Vanadium Reporting Units pg/L pg/L mg/L mg/L pg/L pg/L mg/L pg/L pg/L mg/L pg/L mg/L pg/L mg/L pg/L SSA NCAC 02L Standard 10 700 NE 250 1* 300 NE SO NE NE 20 NE NE 250 0.3* Sample ID Depth Interval (FEET BGS) Sample Collection Date SPLP Results Background Soil Samples MW-37C (0-2) 0 - 2 02/04/2015 <0.5 6.5 0.354 <5.3 1 <0.5 1 222 1 0.0266 2.4 <0.5 0.071 1 <0.5 1.73 1 0.75 1.6 j <1 MW-37C (4-6) 4-6 02/04/2015 0.63 136 0.116 2.9 j 1 <0.5 1 13201 0.0352 1 7.4 1 <0.5 1 0.0768 1 <0.5 1 13.9 1 <0.5 2.3 1.5 Former Ash Disposal Area Soil Samples MW-15RSB(1-2) 1-2 07/11/2019 15 <50 14 <1 1 1.5j 1 770 <5 21 <40 <5 <5 1 0.78j 46 0.76j 110 MW-15RSB (2-4) 2-4 07/11/2019 <2 22 j 1.7 j I <1 1 <5 1 9109 <5 1 3.9 j 1 <40 1 <5 1 <5 1 3.7 j 1 4.2 j 1 0.51 j 1 7.2 Former Coal Pile Area Soil Samples MW-43SB (1-2) 1 -2 07/10/2019 <2 <50 2.7 j 1 <5 430 <5 8.4 j <40 0.72 j <5 2.9 j 15 10 15 MW-43SB (2-4) 2-4 07/10/2019 <2 <50 2 j1 <5 <100 <5 28 <40 <5 <5 0.84 j 10 9.3 <5 MW-44SB (3-5) 3 - 5 07/19/2019 <2 <50 1.2 j1 <5 970 <5 13 j <40 0.87 j <5 3.2 j 3.5 j 0.76 j 8.4 MW-46SB (1-2) 1 -2 07/10/2019 1.3 j <50 1.8 j1 P<1 <5 1900 <5 13 j <40 <5 <5 2.9 j 9.1 j 0.44 j 4.2 j MW-46SB (2-4) 2-4 07/10/2019 2.1 <50 1.5 j1 <5 1900 <5 12 j <40 <5 <5 3.5 j 7.6 j 0.73 j 3.2 j MW-50SB (1-2) 1 -2 07/09/2019 6.7 <50 2.7 j1 1.3 j 9600 <5 27 <40 0.8 j <5 1.4 j 23 1.4 46 MW-50SB (2-4) 2-4 07/09/2019 <2 <50 1.3 j <5 64 j <5 7.3 j <40 <5 <5 2.1 j 3.7 j 1.8 <5 Notes: 0 - Bold highlighted concentration indicates exceedance of the 15 NCAC 02L Standard for Groundwater < - Concentration not detected at or above the adjusted reporting limit. * - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013. BGS - below ground surface j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit. mg/L - milligrams per Liter NE - not established S.U. - standard units SPLP - Synthetic Precipitation Leaching Procedure pg/L - micrograms per Liter Prepared by: BER Checked by: WJW Revised by: LWD Page 1 of 1 TABLE 5-12 SUMMARY OF CENTRAL TENDENCY AND LOWER CONFIDENCE LIMIT ANALYSIS RESULTS - SA2 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Analytical Parameter (2018 CSA Update COI List) pH Arsenic Boron Chloride Hexavalent Chromium Iron Manganese Selenium Sulfate Total Dissolved Solids Cobalt Vanadium Alkalinity Calcium Fluoride Lithium Magnesium Molybdenum Potassium Sodium Strontium Reporting Units S.U. pg/L pg/L mg/L pg/L pg/L pg/L pg/L mg/L mg/L pg/L pg/L mg/L mg/L mg/L pg/L mg/L pg/L mg/L mg/L pg/L 15A NCAC 02L Standard 6.5 - 8.5 10 700 250 10 300 50 20 250 Soo 1* 0.3* NE NE 2 NE NE NE NE NE NE 2018 Background Threshold Values (Upper Surficial Flow Zone) ` 6.5 - 8.5 1 50 5 0.03 468 43 1 16 25 0.9 0.3 5 0.9 NE NE 0.5 1 0.7 3 8 2020 Background Threshold Values (Upper Surficial Flow Zone)2 4.1 - 7.3 2 50 6 0.06 6270 113 1 15 64 3 2 20 8.12 0.2 5 0.5 1 0.8 3 71 2018 Background Threshold Values (Lower Surficial Flow Zone)' 4.1 - 5.1 3 50 18 0.1 9540 470 1 19 110 3 1 68 18 NE NE 3 1 13 45 2020 Background Threshold Values (Lower Surficial Flow Zone) 5.1 - 7.3 14 50 30 0.1 28300 744 1 22 880 7 2 165 68 0.5 5 3 1 %1 5 13 161 Risk -Based Alternative Cleanup Goals 3 NE 8.3 1 55 2719394 484 139 825 NE 8 87 NE NE NE NE NE 139 NE NE 16623 Sample ID Associated Source Area Flow Zone Lower Confidence Limit (95th Percentile) or Central Tendency Value Analysis Result Source Area 2 Background Wells MW-04 BACKGROUND Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-04A BACKGROUND Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-04B BACKGROUND Upper Surficial 6.9 NC NC 12 NC 4328 114 NC 9.8 198 NC NC 152 64 NC NC 2.4 NC 2.6 6.2 141 MW-05A BACKGROUND Upper Surficial 3.9 NC NC 1.3 NC 310 30 NC 5.7 NC NC NC NC 0.16 NC NC 0.11 NC 0.23 1 NC MW-05B BACKGROUND Upper Surficial 4.4 <1 <50 2.5 0.08 29 23 <1 6 <25 2.3 <0.3 <5 0.77 <0.1 <5 0.23 <1 0.52 1.4 7.1 MW-05C BACKGROUND Lower Surficial 5.6 <1 <50 12 0.08 11 <5 <1 9.6 49 <1 <0.3 8.4 3.1 <0.1 <5 1.8 <1 1.1 8.3 19 MW-08 BACKGROUND Lower Surficial 5.6 <1 <50 113 0.05 19 176 <1 11 55 <1 I <0.3 13 14.8 <0.1 <5 12.4 <1 1.2 110 32 MW-08B BACKGROUND Upper Surficial 5.9 1.2 <50 4.1 <0.025 4364 5.7 <1 0.93 <25 <1 0.41 16 4.7 <0.1 <5 0.26 <1 0.4 1.9 16 MW-37B BACKGROUND Upper Surficial 4.7 <1 <50 3.9 0.03 <10 6.8 <1 4.9 <25 <1 <0.3 <5 0.46 0.17 <5 0.13 <1 0.21 2.1 5 MW-37C BACKGROUND Lower Surficial 6 2.2 <50 3.8 <0.025 7496 162 <1 7.5 66 2.1 0.95 32 10 <0.1 <5 1.3 <1 2.4 2.2 15 MW-41B BACKGROUND Upper Surficial 4.6 <1 <50 3.5 <0.025 261 9.8 <1 <0.1 <25 1.2 <0.3 <5 0.6 <0.1 <5 0.21 <1 0.37 2 <5 MW-41C BACKGROUND Lower Surficial 6.3 14 <50 3.4 <0.025 24624 325 <1 1 <25 6.2 <0.3 17 2.3 <0.1 <5 1.2 1.1 0.78 2.5 14 Source Area 2 Upper Surficial Flow Zone Assessment Wells MW-13 SA2 Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-13R SA2 Upper Surficial 6.9 22 872 21 <0.025 25267 735 <1 3.3 316 <1 0.43 265 71 <0.1 30 17 12 9.2 25 2277 MW-14 SA2 Upper Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-15RB SA2 Upper Surficial 6.6 116 120 8.3 0.03 8370 213 <1 8.4 225 <1 0.37 178 58 0.13 5.6 5.4 8.3 3.8 7.3 702 MW-16 SA2 Upper Surficial 5.9 1.4 57 9.2 0.06 100 7.9 <1 8.6 65 <1 0.32 15 4.5 0.19 5.8 2.5 3.1 3.3 11 79 MW-20 SA2 Upper Surficial 6.7 <1 <50 5.6 <0.025 518 87 1.3 404 723 1.4 23 224 218 0.21 11 12 1.8 3.9 4.3 338 MW-43B SA2 Upper Surficial 4.3 32 1 59 6.5 0.03 33050 1 71 1.1 198 1 388 2.6 1 74 7 161 <0.1 8.7 13.2 4 5.8 1 7.3 83 MW-44B SA2 Upper Surficial 6.1 22 84 12 <0.025 1551 <5 <1 15 179 <1 60 87 34 0.12 <5 4.2 7.3 4.9 11 148 MW-45B SA2 Upper Surficial 6.2 <1 52 19 <0.025 154 109 <1 <0.1 123 <1 0.35 55 11 <0.1 19 6 7.2 4.4 13 202 MW-46B SA2 Upper Surficial 6 2.2 <50 4.6 0.03 1231 69 <1 <0.1 138 <1 0.33 106 40 <0.1 <5 2.7 3.1 2.8 4 184 MW-47B SA2 Upper Surficial 7.2 3.2 104 14 0.04 591 328 <1 17 113 <1 0.65 43 12 0.21 <5 3.5 17 4.3 16 145 MW-48B SA2 Upper Surficial 6.8 16 188 22 0.13 381 69 <1 5.8 211 <1 0.69 107 26 <0.1 15 5.9 4.3 6.3 22 822 MW-49B SA2 Upper Surficial 7.4 7.6 207 35 <0.025 4420 159 <1 15 175 <1 1.3 59 14 0.3 20 5.5 21 5.6 29 325 MW-50B SA2 Upper Surficial 6.1 1 63 5.5 0.04 3713 27 <1 38 248 <1 0.72 137 62 <0.1 <5 2.9 6.7 8 5.7 247 Source Area 2 Lower Surficial Flow Zone Assessment Wells ABMW-02D SA2 Lower Surficial 7.1 141 751 39 <0.025 2162 235 <1 87 372 3.7 0.47 218 72 0.53 <5 18 59 11 37 2124 MW-13RD SA2 Lower Surficial 7.1 4.5 2200 61 <0.025 8450 577 <1 81 422 7.1 <0.3 192 72 1 61 21 188 13 47 2263 MW-15 SA2 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC MW-15RC SA2 Lower Surficial 6.4 1 454 55 0.03 1707 552 <1 75 296 <1 <0.3 87 50 <0.1 <5 5.6 4.2 4 41 338 MW-16D SA2 Lower Surficial 4.7 <1 575 78 <0.025 922 216 <1 88 273 3.8 1.6 <5 17 <0.1 <5 3.9 <1 4.3 67 95 MW-20D SA2 Lower Surficial 7 1.5 166 44 <0.025 893 133 <1 54 292 1.2 <0.3 103 43 1 <0.1 <5 4.3 7.2 2.9 43 159 MW-43C SA2 Lower Surficial 6.1 2.2 145 15 <0.025 4039 203 <1 25 109 <1 2.3 29 15 <0.1 <5 14 5.9 3.4 12 115 MW-44C SA2 Lower Surficial 6.3 14 1143 40 <0.025 9631 658 <1 75 339 5.5 <0.3 145 56 0.1 <5 13 53 9 33 1092 MW-45C SA2 Lower Surficial 6.4 19 1194 59 <0.025 7773 960 <1 56 372 3.5 0.66 143 55 <0.1 <5 14 79 8.8 48 1155 MW-46C SA2 Lower Surficial 6.2 1.4 1075 35 0.03 1566 1148 <1 58 232 8.8 <0.3 79 35 <0.1 <5 8.6 5.9 8.2 29 657 MW-47C SA2 Lower Surficial 6.9 6.6 820 32 <0.025 3803 260 <1 52 192 5.1 0.71 61 28 0.14 <5 6.7 79 7.6 26 600 MW-48C SA2 Lower Surficial 7 1.5 1290 55 <0.025 6907 674 <1 43 309 <1 0.4 147 49 <0.1 <5 13 25 9.5 45 1297 MW-49C SA2 Lower Surficial 7.2 99 814 32 <0.025 4160 413 <1 57 400 6.8 0.41 272 83 1 0.67 102 26 53 12 33 2220 MW-50C SA2 Lower Surficial 5.8 2 218 22 <0.025 1310 121 <1 27 122 <1 <0.3 26 13 <0.1 <5 3.8 10 4.5 17 149 TW-L024 SA2 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC TW-L098 SA2 Lower Surficial NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC Notes: O - bold highlighted concentration indicates value is greater than applicable regulatory standard (02L or IMAC) O - bold highlighted concentration indicates value is greater than greatest background threshold value where there is no regulatory standard, or 2020 background threshold values are greater than regulatory standard O - bold highlighted concentration indicates value is greater Risk -Based Alternative Cleanup Goals 1 - 2018 Background threshold values were calculated using data from background groundwater samples collected June 2015 to April 2017. 2018 Background threshold values approved by NCDEQ on May 14, 2018. 2 - 2020 Updated background threshold values were calculated using data from background groundwater samples collected October 2010 to December 2018 and submitted to NCDEQ February 2020. The 2020 background threshold value updates retain outlier concentrations in background groundwater datasets (SynTerra, 2020). 3 - Risk -Based Alternative Cleanup Goals 4 - Lower Confidence Limit or Central Tendency values calculated from data ranging from January 2015 to March 2020. See Appendix H * - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013. < - concentration not detected at or above the adjusted reporting limit. COI - constituent of interest CSA - comprehensive site assessment mg/L - milligrams per liter NC - not calculated NCAC - North Carolina Administrative Code NE - not established S.0 - standard units pg/L - microgram per liter Prepared by: PPB Checked by: WJW Page 1 of 1 TABLE 5-13 SUMMARY TREND ANALYSIS RESULTS FOR GROUNDWATER MONITORING WELLS - SA2 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC A RCADIS I f '�' Hexavalent Iron Manganese- Sulfate Total Dissolved Coba t Reporting Unit pg/L pg/L mg/L pg/L um pg/L pg/L SU pg/L mg/L mg/L pg/L pg/L mg mg/L mg/L um pg/L �PPotmag/L mg/L pg/L mg/L mg/L 02L or IMAC Criterion 10 700 250 10 300 50 6.5-8.5 20 250 500 1 0.3 NA NA NA NA NA NA NA 40 4 Upper Surficial BTV 1.56 50 5.5 0.055 6270 112.7 4.1-7.3 1 15 64 3.49 1.96 20 8.12 0.53 1 0.83 3.08 71 5 0.24 Lower Surficial BTV 14 50 30 0.1 28300 744 5.1-7.3 10 22 880 7 2 165 68 3 1 5 13 167 5 0.5 Upper Surficial Wells At or Beyond Compliance Boundary MW-15RB I [244] D D NE NE NE S ND S S ND NE S S S S S S NE S S MW-16 S D S NE NT S S ND D NT ND NT S S S S S S I [95] NE NE MW-20 NT S NT ND NT NT D I I [850] I [1200] NT NT I [242] I [4381 I [19.8] NT S NT NT I S MW-43B S S S NE S NT D S S D S NT S D D S S S S S NT MW-44B S S S S D S S ND NT I (273) ND I [1391 S I [56.8] S S S S I [273] S S MW-45B I (5.9) S I NE NE NE S ND I I (332) ND NE S I [58.2] S S S I [30.7] NE S S MW-46B S I S j S NE NE NE S ND NT S S NE S S S S S S NE ND S MW-506 NE NE NE NE NE NE NE NE NE NE NE NE NE NE NE NE NE NE NE NE Lower Surficial Wells At or Beyond Compliance Boundary ABMW-02D D I [775] S ND I I D ND S S I (5.42) NT I [309] I [96.5] I [25.8] S S D I [2770] NE NE MW-15RC I S D NE NE NE S ND S D I [10.6] NE D D S I [12.2] S D NE ND S MW-16D NT I [709] D ND D S S ND D D D D ND D S ND S D S ND D MW-20D I [31.8] NT D ND NT NT S ND S S ND S NT S NT NT NT S NT ND S MW-43C I I I ND S S D ND S S I S S S S S S S S ND D MW-44C S S S ND D S D ND S S S S S S S S S S S ND S MW-45C I [27.2] S S NE NE NE S ND S S 1(6.04) NE S S S S S S NE ND S MW-46C S S S NE NE NE S ND S S S NE S S S S S S NE ND S MW-50C S S S ND D S AD ND S S I S S S S S S S S ND D Notes: Summary of results and trends are presented for samples collected from 2015 - 2020. Trend results are presented when at least four samples were available and frequency of detection was >50%. Statistically significant trends are reported at the 95% confidence level. Variability Index (VI) is calculated as the (maximum - minimum) / median concentration and is calculated using detected concentrations only. Values less than 1 indicate low variability in the dataset. For pH, statistically significant, increasing trend with a maximum recent result (2019 - 2020) greater than 8.5. Maximum detected result for 2018 and 2019 time period shown in parentheses. ND S NT I I (>0.5*Criterion) = Greater than 50 percent of constituent concentrations were non -detect = Statistically significant, decreasing concentration trend = Stable. No significant trend and variability is low (VI < 1) = No significant trend and variability is high (VI > 1) = Statistically significant, increasing concentration trend. = Statistically significant, increasing concentration trend with a maximum recent concentration (2019 - 2020) greater than 50% of the relevant 02L, IMAC, or BTV criterion. Maximum detected concentration for 2019 and 2020 time period shown in parentheses. I [>Criterion] = Statistically significant, increasing concentration trend with a maximum recent concentration (2019 - 2020) greater than the relevant 02L, IMAC, or BTV criterion. Maximum detected concentration for 2019 and 2020 time period shown in brackets. NE = Insufficient number of samples to evaluate trend (n < 4) Acronyms and Abbreviations: > = greater than < = less than <_ = less than or equal to 02L = 15A North Carolina Administrative code (NCAC) .02L standard BTV = background threshold value IMAC = interim maximum allowable concentration SSA NCAC .02L Appendix 1 mg/L = milligrams per liter n = sample size NA = not available SU = standard units VI = variability index pg/L = micrograms per liter Source: Table 3, Plume Stability Evaluation - L.V. Sutton Energy Complex, ARCADIS 2020 (Appendix L) Page 1 of 1 ■ TABLE5-14 POST -EXCAVATION EFFECTIVENESS MONITORING PLAN ELEMENTS SOURCE AREAS 1 AND 2 CORRECTIVE ACTION PLAN UPDATE L.V. SUTTON ENERGY COMPLEX DUKE ENERGY PROGRESS, LLC, WILMINGTON, NC Post -Excavation Effectiveness Monitoring Plan (EMP) Implemented 30 days after CAP Approval Post -Excavation EMP Groundwater Well Monitoring Network 77 Wells (background, downgradient of source areas) AW-04B CCR-113B FPA-03C MW-16D MW-40C SMW-06B AW-04C CCR-113C FPA-04B MW-20 MW-41B1 SMW-06C AW-06B CCR-114B FPA-04C MW-20D MW-41C1 CCR-107RB CCR-114C FPA-09B MW-21C MW-43B CCR-107RC CCR-119B FPA-09C MW-23B MW-43C CCR-108RB CCR-119C MW-05B1 MW-23C MW-44B CCR-108RC CCR-120B MW-05C1 MW-27B MW-44C CCR-109B CCR-120C MW-07B MW-27C MW-45B CCR-109C CCR-122RB MW-07C MW-28B MW-45C CCR-110B CCR-122RC MW-081 MW-28C MW-46B CCR-110C CCR-124RB MW-08B1 MW-37B1 MW-46C CCR-111B CCR-124RC MW-12R MW-37C1 MW-50B CCR-111C CCR-204C MW-15R-B MW-39B MW-50C CCR-112B DMW-04 MW-15R-C MW-39C SMW-01B CCR-112C FPA-03B MW-16 MW-40B SMW-01C Post -Excavation EMP Surface Water Monitoring Network 12 Locations (background, downgradient of source areas) SW-2 SW-5 SW-8 SW-141 SW-3 SW-6 SW-9 SW-151 SW-4 SW-7 SW-10 SW-17 Post -Excavation EMP Groundwater Quality 314 (Quarterly for One Year followed by Semi -Annual Sampling Frequency) Alkalinity (CO3/HCO3) Chromium (hexavalent)^ Magnesium^ Phosphorous^ Strontium^ Aluminum^ Arsenic^ Cobalt^ Manganese^ Potassium^ Sulfate^ Barium^ Boron2^ Fluoride^ Molybdenum^ Selenium^ TDS (Total Dissolved Solids)2 Nitrate + Nitrite Calcium^ Iron^ pH Sodium^ Vanadium^ TOC (Total Organic Carbon) Chloride^ Lithium^ Post -Excavation EMP Surface Water Quality3,4 (Quarterly for One Year followed by Semi -Annual Sampling Frequency) Aluminum^ Boron^ Cobalt^ Manganese^ Potassium Thallium (low level)^ Alkalinity (as CaCO3) Cadmium^ Copper^ Mercury^ Selenium^ TDS Antimony^ Calcium Fluoride Methane Silver^ TOC Arsenic^ Carbonate Hardness Molybdenum^ Sodium TSS (Total Suspended Solids) Barium^ Chloride Iron^ Nickel^ Strontium^ Vanadium (low level)^ Beryllium^ Chromium (VI)^ Lead^ Nitrate + Nitrite Sulfate Zinc^ Bicarbonate Chromium^ Magnesium Phosphorous^ Sulfide Post -Excavation EMP Groundwater and Surface Water Field Parameters Dissolved Oxygen (DO) pH Oxidation Reduction Potential Specific Conductivity Temperature Turbidity Post -Excavation EMP Duration Annual Effectiveness Monitoring Evaluation and Reporting 1) Summary of annual groundwater monitoring results 2) Evaluate statistical concentration trends 2) Comparison of observed concentrations to model predictions 3) Evaluation of compliance with applicable Standards 4) Evaluation of system performance and effectiveness 4) Recommend plan adjustments, if applicable, to optimize the remedial action 5-Year EMP Review Reporting 1) Update background analysis 2) Confirm Risk Assessment assumptions remain valid 3) Re-evaluate effectiveness of technology 4) Verify modeling results, update model if needed 5) Modify corrective action approach, as needed, to achieve compliance goal established 6) Implement contingency option if necessary Post -Excavation EMP Review 30 days after CAP approval, the EMP will be implemented at the Site and will continue until there is a total of three years of data confirming COIs are below applicable Standards at or beyond the compliance boundary, at which time a request for completion of active remediation will be filed with NCDEQ. If applicable standards are not met after five years, the EMP will continue and contingency options, such as air sparging, may be re-evaluated if necessary. i Approved background groundwater monitoring location 2 Geochemically non -reactive constituent (i.e., conservative corrective action COI) that best depicts the areal extent of the plume; monitors plume stability and physical attenuation 3 The number of sample locations and parameters may be adjusted based on additional data and the effects of corrective action. ° Groundwater standards may be modified over time in accordance with 02L .0106(k) ^Dissolved parameters are recommended to be collected for all 2018 CSA Update COIs and aluminum, fluoride, and lithium CAP - Corrective Action Plan COI - Constituent of Interest CSA - Comprehensive Site Assessment DO - Dissolved Oxygen EH - Redox Potential EMP - Effectiveness Monitoring Plan NCDEQ - North Carolina Department of Environmental Quality ORP - Oxidation Reduction Potential TDS - Total Dissolved Solids TOC - Total Organic Carbon Page 1 of 1