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Home My WebLink AboutNC0004979_04_Allen_CAP Update 2019_Tables_20191231Corrective Action Plan Update December 2019 Duke Energy Carolinas, LLC - Allen Steam Station TABLES (CAP Content Section 9) SynTerra Corrective Action Plan Update December 2019 Duke Energy Carolinas, LLC - Allen Steam Station SynTerra Table ES-1 Summary of Allen Assessment Documentation Included in Executive Summary text Corrective Action Plan Update December 2019 Duke Energy Carolinas, LLC - Allen Steam Station SynTerra Table ES-2 Summary of Allen Assessment Activities Included in Executive Summary text Corrective Action Plan Update December 2019 Duke Energy Carolinas, LLC - Allen Steam Station SynTerra Table ES-3 Components of Source control, active remediation, and monitoring Included in Executive Summary text TABLE 1-1 SUMMARY OF ONSITE INCIDENTS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Proximity Station Station DEQ Incident Occurrence Status Closure Release Latitude Longitude to Ash Notes Name Location Section Number Date Date Type Basins (ft) Allen Belmont UST 11186 3/24/1993 Open NA Petroleum 35.190243 -81.008476 1,522 NA Allen Belmont UST 16184 11/24/1997 Open NA Petroleum 35.188744 -81.007921 1,242 NA Allen Belmont UST 40625 2/22/2016 Open NA Petroleum 35.188794 -81.007403 1,250 NA Allen Belmont UST 40581 2/29/2016 Open NA Petroleum 35.187947 -81.007367 912 NA Allen Belmont UST 18137 11/24/1997 Open NA Petroleum 35.188745 -81.00792 1,230 NA Former APS #88058 (Per DENR letter 10/17/2008) AOC3A PCE in soil at depth of 16-18ft at Allen Belmont IHSB NONCD0002824 5/5/2006 Open NA PCE 35.18819 -81.01127 450 conc. 0.032 mg/kg > UST Section Soil-to-GW MSCC of 0.0074 mg/kg; GW conc. <MDL Notes• Onsite incident records provided by Duke Energy DEQ - Department of Environmental Quality ft - feet UST - Underground Storage Tank NA - Not Available IHSB - Inactive Hazardous Sites Branch PCE - tetrachloroethene DENR - Department of Environment and Natural Resources mg/kg - milligrams per kilogram GW - groundwater MSCC - Maximum Soil Contaminant Concentration MDL - Method Detection Limit Prepared By: LWD Checked By: EMY Page 1 of 1 TABLE 3-1 SUMMARY OF ONSITE FACILITIES CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Evaluated Facility as Source CSA Operational Source Area Rationale for Name Arean Schedule Status Material or Evaluation Capacity Update Retired Ash Coal Ash/NPDES CAMA Basin/Inactive Yes NA Inactive Permitted waste 132 acres regulated unit Ash Basin streams Active Ash Coal Ash/NPDES CAMA Basin Yes NA Inactive Permitted waste 169 acres regulated unit streams Adjacent to and Coal Pile Yes NA Operational Coal 18.5 acres hydrologically connected to the ash basins Not Gypsum Pad No Mar-20 Operational Gypsum 3.5 acres hydrologically connected to the ash basins Prepared by: LWD Checked by: CIS Notes: CSA Schedule - applicable only for units identified in the letter "Final Comprehensive Site Assessment and Corrective Action Plans Approvals for Duke Energy Coal Ash Facilities (April 5, 2019)" NA - Not Applicable CAP - Corrective Action Plan CAMA - North Carolina Coal Ash Management Act NPDES - National Pollution Discharge Elimination System Page 1 of 1 TABLE 4-1 BACKGROUND SOIL SAMPLE SUMMARY CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Soil Boring Depth Range (feet bgs) Number of Sampled Intervals BG-1D (1-50) 4 BG-2D (1-20) 3 BG-3D (1-20) 3 GWA-8D (38.5-50) 2 GWA-14D (10-12) 1 BGSB-BG-1 (4-25) 3 BGSB-BG-2 (4-25) 3 BGSB-BG-3 (4-35) 3 BGSB-GW-8 (4-25) 3 BGSB-GWA-23 (4-22) 3 BGSB-GWA-26 (4-25) 3 Prepared by: LWD Checked by: CIS Page 1 of 1 TABLE 4-2 BACKGROUND VALUES FOR SOIL CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Constituent Reporting Unit PSRG Protection of Groundwater 2018 Background Threshold Valuer 2019 Updated Background Threshold Value Piedmont Background Threshold Value Range3 pH* S.U. NE 4.4-6.2 4.3-6.6 2.3-9.8 Aluminum mg/kg 110,000 44,683 42,879 25,978 - 81,619 Antimony mg/kg 0.9 0.61 0.61 0.177 - 0.9 Arsenic mg/kg 5.8 2.4 2.4 1.2 - 43.13 Barium mg/kg 580 384 229 122.2 - 1,063 Beryllium mg/kg 63 1.3 1.8 1.2 - 4.52 Boron mg/kg 45 6.8 23 14.4 - 56.3 Cadmium rri 3 0.038 1 0.03 - 1 Calcium rri NE 630 1,260 410 - 8,769 Chloride mg/kg NE 14 423 12 - 423 Chromium mg/kg 3.8 57 49 20 - 440 Cobalt mg/kg 0.9 29 68 27 - 81.68 Copper mg/kg 700 71 81 17.4 - 216 Iron mg/kg 150 61,162 60,916 24,500 - 85,345 Lead mg/kg 270 13.5 19.8 7.5 - 95.23 Magnesium mg/kg NE 10,584 17,097 760 - 51,829 Manganese rri 65 1,222 1,927 370 - 3,388 Mercury mg/kg 1 0.1 0.1 0.04 - 0.113 Molybdenum mg/kg 7.1 5.4 5.4 1.83 - 12 Nickel mg/kg 130 9.9 53.5 9.2 - 237 Nitrate (as N) mg/kg NE 0.3 0.28 0.25 - 31.2 Nitrate mg/kg NE --- 43.7 40.3 - 48.8 Potassium mg/kg NE 10,698 18,117 427 - 35,600 Selenium rri 2.1 0.81 2.30 1.58 - 6.857 Sodium mg/kg NE 600 730 338 - 1,500 Strontium mg/kg 1,500 31 28.73 7.1 - 200 Sulfate mg/kg 1,438^ 14 437 12 - 437 Thallium rri 0.28 0.48 0.48 0.166 - 2.132 Total Organic Carbon mg/kg NE --- 3,470 742 - 4,960 Vanadium mg/kg 350 132 132 42 - 230.9 Zinc rri 1,200 72.3 1 80.8 1 60.5 - 325.5 11 Prepared by: LWD Checked by: EMY Notes: 2018 background threshold values were approved by North Carolina Department of Environmental Quality (NCDEQ) on May 14, 2018. ^ - PSRG Protection of Groundwater value was calculated using the equation shown in Section 6 * - Upper and lower threshold values calculated for parameter ' - 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 collected February 2015 to August 2017. The background threshold value updates retained extreme outlier concentrations in background unsaturated soil datasets (SynTerra, 2019). 3 - Piedmont background threshold value ranges include the Duke Energy calculated 20174 and 20195 background threshold values from 10 Duke Energy facilities located in the Piedmont physiographic region (Allen Steam Stations, Belews Creek Steam Stations, Buck Steam Station°, Cape Fear Steam Electric Plant°, Cliffside Steam Stations, Dan River Steam Station°, Marshall Steam Stations, Mayo Steam Electric Plants, Riverbend Steam Station°, and Roxboro Steam Electric Plants). --- - 2018 background threshold value was not calculated for constituent. mg/kg - milligrams per kilogram NE - not established S.U. - standard unit PSRG - preliminary soil remediation goals Page 1 of 1 TABLE 4-3 BACKGROUND VALUES FOR GROUNDWATER CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Constituent Reporting Unit SSA NCAC 02L Standard 2018 Background Threshold Values' 2019 Updated Background Threshold Values2 Piedmont Background Threshold Value Range3 Shallow Flow Zone Deep Flow Zone Bedrock Flow Zone Shallow Flow Zone Deep Flow Zone Bedrock Flow Zone pH S.U. 6.5-8.5 4.4-7.4 6.2-7.5 7.2-8.4 4.5-7.8 6.1-8.5 6.6-9.0 3.6-9 Alkalinity mg-CaCO3/L NE 105 77 116 105 134 138 19 - 379 Aluminum pg/L NE 534 304 301 1,238 540 736 100 - 1,238 Antimony Ng/L 1* 1 1 1 1 1 3 0.5- 2.9 Arsenic pg/L 10 1 1 2 1 1 2 0.2- 6.35 Barium pg/L 700 105 132 21 87 103 25 10.52 - 840 Beryllium Pg/L 4* 0 0 0 0.1 1 0.1 0.0625 - 1 Bicarbonate mg-CaCO3/L NE 105 77 116 106 125 136 19 - 388 Boron pg/L 700 50 50 50 50 50 50 50- 176.8 Cadmium Ng/L 2 1 1 0 0.08 1 0.08 0.08- 1 Calcium mg/L NE 20 17 25 21 31 28 4 - 111 Carbonate mg-CaCO3/L NE 5 5 5 5 5 5 5- 10 Chloride mg/L 250 5 5 5 11 5 9 3.34 - 250 Chromium pg/L 10 7 7 6 9 16 10 1- 26 Chromium (VI) ug/L NE 2 1 0 2 2 0.8 0.03 - 12 Cobalt Ng/L 1* 2 1 0 6 0.8 0.3 0.088 - 88.85 Copper ug/L 1,000 3 3 2 3 2 2 0.5 - 17.15 Fluoride mg/L 2 --- --- --- 0.1 0.1 0.1 0.1- 1.8 Iron ug/L 300 884 356 284 1,422 665 1,242 56.3 - 37,500 Lead pg/L 15 0 0 0 1 0.2 0.1 0-2 Lithium ug/L NE --- --- --- 3 25 26 2 - 95.39 Magnesium mg/L NE 6 5 8 6 7 8 1- 45 Manganese pg/L 50 225 26 278 608 256 360 7 - 9,170 Mercury pg/L 1 0 0 0 0.2 0.2 0.1 0.05 -0.5 Methane ug/L NE 12 SO 90 15 125 10 1- 2,505 Molybdenum pg/L NE 1 2 9 7 26 11 0.5- 26.2 Nickel pg/L 100 6 5 3 9 10 7 0.87 - 48 Nitrate + Nitrite mg-N/L NE 1 1 2 3 3 3 0.02 - 6.3 Potassium mg/L NE 6 5 8 5 10 19 1.609 - 18.8 Selenium pg/L 20 1 1 1 0.5 0.8 0.5 0.5- 2.4 Sodium mg/L NE 21 12 12 21 24 15 6- 190 Strontium pg/L NE 298 232 154 300 240 181 27 - 2,120 Sulfate mg/L 250 2 5 3 5 15 7 1.2 - 510 Sulfide mg/L NE 0 0 0 0.1 0.1 0.1 0.1 - 2 TDS mg/L 500 163 158 165 154 173 221 50- 1,200 Thallium pg/L 0.2* 0 0 0 0.1 0.1 0.1 0.1 - 0.2 TOC mg/L NE 1 1 6 12 11 2 1- 12.3 Total Radium pCi/L 5^ 1 1 1 2 2 1 0.494 - 35 Total Uranium pg/mL 0.03^ 0 0 0 0.0005 0.0005 0.0009 0.0002 - 0.864 Vanadium pg/L 0.3* 6 12 16 4 16 13 0.33 - 25.8 Zinc ug/L 1,000 45 SO 15 45 15 13 5- 140 Prepareo oy: LWD cneckeo ny: JYI Notes: 2018 background threshold values (BTVs) approved by North Carolina Department of Environmental Quality (NCDEQ) on May 14, 2018. Background threshold values have been rounded to similar levels of precision as 15A North Carolina Administrative Code (NCAC) 02L Standard or Interim Maximum Allowable Concentration (IMAC). - BNs were calculated using data from background groundwater samples collected June 2015 to September 2017. 2 - Updated BNs were calculated using data from background groundwater samples collected March 2011 to December 2018. - Piedmont background threshold value ranges include the Duke Energy calculated 20174 and 20195 background threshold values from 10 Duke Energy facilities located in the Piedmont physiographic region (Allen Steam Stations, Belews Creek Steam Stations, Buck Steam Station, Cape Fear Steam Electric Plant, Cliffside Steam Stations, Dan River Steam Station, Marshall Steam Stations, Mayo Steam Electric Plants, Riverbend Steam Station, and Roxboro Steam Electric Plants). --- - 2018 BTV was not calculated for constituent. * - IMAC of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013. ^ - Federal Maximum Contaminant Level (MCL) pg/L - micrograms per liter pg/ml- - micrograms per milliliter mg/L - milligrams per liter mg-CaCO3/1- - milligrams calcium carbonate per liter mg-N/L - milligrams nitrogen per liter NE - not established pCi/L - picocuries per liter S.U. - standard units TDS - total dissolved solids TOC - total organic carbon Page 1 of 1 TABLE 4-4 BACKGROUND DATASET RANGES FOR SURFACE WATER CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Constituent Reporting Comparison Criteria Background Range Constituents with 15A NCAC 02B Class B, Water Supply: WS-V 1 Standards pH S.U. 6.0-9.0 6.3 - 7.6 Dissolved Oxygen mg/L >_ 4 4.1 - 9 Temperature deg C <_ 32 11 - 29 Turbidity NTU <_ 25 5.4 - 29.4 Arsenic pg/L 10 0.33 - <1 Arsenic (Dissolved) pg/L acute: 340, chronic: 150 0.3 - <1 Barium pg/L 1000 11.1 - 18.6 Beryllium (Dissolved) pg/L acute: 65, chronic: 6.5 <0.1 Cadmium Dissolved z pg/L acute: 0.82, chronic: 0.15 <0.08 - <0.1 Chloride mg/L 230 3.6 - 7.1 Chromium III Dissolved Z, 3 pg/L acute: 180, chronic: 24 NA Chromium (VI) (Dissolved) pg/L acute: 16, chronic: 11 NA Copper Dissolved Z pg/L acute: 3.6, chronic: 2.7 0.9 - 3.5 Fluoride mg/L 1.8 <0.1 Lead Dissolved Z pg/L acute: 14, chronic: 0.54 0.033 J - <0.2 Mercury pg/L chronic: 0.012 0.000452 j,B - 0.00201 Nickel pg/L 25 0.13 j - 1 Nickel Dissolved z pg/L acute:140, chronic: 16 0.2 j - <1 Nitrate + Nitrite mg-N/L 10 0.12 - 0.38 Selenium pg/L chronic: 5 <0.5 - <1 Silver Dissolved Z pg/L acute: 0.3, chronic: 0.06 <0.5 Sulfate mg/L 250 2.8 - 4.5 Thallium pg/L 2 0.015 j - <0.2 Total Dissolved Solids mg/L 500 29 - 150 Total Hardness mg/L 100 13.7 - 16.6 Zinc Dissolved z pg/L acute: 36, chronic: 36 <5 - <10 Constituents with USEPA National Recommended Water Quality Criteria Alkalinity mg/L chronic: 20 12.7 - 17.6 Aluminum pg/L acute: 620, chronic: 300 65.8 j - 510 Antimony pg/L 5.6 0.15 j - 0.53 Iron pg/L 1000 82.3 - 846 Manganese pg/L 50 22.5 - 78.4 Constituents without 02B or USEPA Criteria Bicarbonate mg-CaCO3/1- NE 12.7 - 17.6 Boron pg/L NE 30.8 j - 60.5 Cadmium pg/L NE <0.08 - <0.1 Calcium mg/L NE 2.82 - 4.95 Carbonate Alkalinity mg-CaCO3/1- NE <5 Chromium pg/L NE 0.17 j - 1.7 Chromium (VI) pg/L NE <0.025 - 0.069 Cobalt pg/L NE 0.073 j - 0.28 Copper pg/L NE 1.2 - 4.8 Lead pg/L NE 0.094 j - 0.48 j Lithium pg/L NE 0.13 - 0.36 Magnesium mg/L NE 1.53 - 2.14 Methane pg/L NE 14.4 - 49.5 Page 1 of 2 TABLE 4-4 BACKGROUND DATASET RANGES FOR SURFACE WATER CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Constituent Reporting Comparison Criteria Background Range Constituents without 02B or USEPA Criteria (Continued) Molybdenum pg/L NE 0.17 j - 0.44 j Potassium mg/L NE <5 Sodium mg/L NE 3.49 j - 5.38 Strontium pg/L NE 26.1 - 35.9 Sulfide mg/L NE <0.1 Total Organic Carbon mg/L NE 1.4 - 2.2 Total Radium pCi/L NE NA Total Uranium pg/mL NE 0.000035 j - 0 Vanadium pg/L NE 0.71 - 1.7 Zinc I p /L I NE 1 2.7 j - 35.6 Prepared by: LWD Checked by: CJS 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 B (Recreation)- Freshwaters protected for primary recreation which includes swimming on a frequent or organized basis and all Class C uses. 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 pg/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 Page 2 of 2 TABLE 4-5 BACKGROUND DATASET RANGES FOR SEDIMENT CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Constituent Reporting Unit Background Range pH* S.U. 6.4 - 7.5 Aluminum mg/kg 3,200 - 28,000 Antimony mg/kg <0.57 - <0.63 Arsenic mg/kg 0.39 j - 2 Barium mg/kg 25 - 95 Beryllium mg/kg 0.096j - 0.25 Boron mg/kg <3 - <8.6 Cadmium mg/kg 0.04 j - <0.16 Calcium mg/kg 310 j - 1,600 Chloride mg/kg 3.1 j - <13 Chromium mg/kg 5.5 - 25 Chromium (III) mg/kg NA Cobalt mg/kg 1.6 - 16 Copper mg/kg 2.7 - 20 Iron mg/kg 3,700 - 44,000 Lead mg/kg 1.5 - 9.4 Magnesium mg/kg 370 - 2,300 Manganese mg/kg 130 - 310 Mercury mg/kg <0.095 - <0.1 Molybdenum mg/kg <2.3 - <2.5 Nickel mg/kg 1.7 j - 15 Nitrate (as N) mg/kg <0.26 - <0.27 Nitrate mg/kg NA Potassium mg/kg 400 - 1,400 Selenium mg/kg 1.3 j - <1.6 Silver mg/kg <0.57 - <0.63 Sodium mg/kg <290 - <320 Strontium mg/kg 4.4 - 8.4 Sulfate mg/kg <13 - <14 Sulfide mg/kg <32 - <34.8 Thallium mg/kg 0.051 j - 0.2 Total Organic Carbon mg/kg 400 j,H - 11,700 H Vanadium mg/kg 8 - 100 Zinc mg/kg 11 - 36 Notes: Background locations were approved by North Carolina Department of Environmental Quality (NCDEQ). * - Upper and lower threshold values calculated for parameter mg/kg - milligrams per kilogram NE - not established S.U. - standard unit PSRG - Preliminary Soil Remediation Goals Prepared by: LWD Checked by: CJS Page 1 of 1 TABLE S-1a MARCH 2O19 WATER LEVEL MEASUREMENTS AND ELEVATIONS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Well ID Top of Casing Elevation (ft. NAVD 88) Top of Screen Elevation (ft. NAVD 88) Bottom of Screen Elevation (ft. NAVD 88) March 2019 Measured Water Level' (ft. BTOC) March 2019 Water Elevation (ft. NAVD 88) Monitoring Flow Zone AB-01R 675.86 622.57 602.57 53.20 622.66 Shallow AB-02 638.74 631.70 616.70 10.62 628.12 Shallow AB-02D 638.33 570.20 565.20 12.28 626.05 Deep AB-04BR 648.50 565.59 560.59 3.30 645.25 Bedrock AB-04D 649.17 601.98 596.98 3.38 645.79 Deep AB-04S 650.42 635.52 620.52 5.12 645.34 Shallow AB-05 677.02 647.10 632.10 38.18 638.84 Shallow AB-06A 579.30 546.08 543.08 6.43 572.87 Shallow AB-06R 579.90 541.00 538.00 5.93 573.97 Shallow AB-09D 582.73 464.80 459.80 12.30 570.43 Deep AB-09S 582.72 575.02 560.02 10.96 571.76 Shallow AB-10BR 576.71 423.93 413.93 7.15 569.56 Bedrock AB-10BRL 576.10 365.68 355.68 5.49 570.61 Bedrock AB-10D 574.97 514.91 509.91 6.70 568.27 Deep AB-10S 575.05 569.61 554.61 6.72 568.33 Shallow AB-11D 618.07 600.39 595.39 4.94 613.13 Deep AB-12D 651.73 558.71 553.71 6.71 645.04 Deep AB-12S 651.67 641.64 626.64 8.50 643.19 Shallow AB-13D 648.54 578.89 573.89 4.05 644.49 Deep AB-13S 648.72 639.98 624.98 3.58 645.14 Shallow AB-14BR 642.20 548.90 543.90 10.38 631.82 Bedrock AB-14D 641.80 620.06 610.06 11.56 630.24 Deep AB-20D 649.30 521.57 516.57 9.33 639.94 Deep AB-20S 649.42 641.74 626.74 10.77 638.65 Ash Pore Water AB-21BR 647.68 481.66 476.66 10.33 637.35 Bedrock AB-21BRL 647.59 421.40 416.40 10.27 637.32 Bedrock AB-21D 647.57 501.70 496.70 10.17 637.40 Deep AB-21S 647.41 638.82 623.82 10.40 637.01 Ash Pore Water AB-21SL 647.36 609.78 599.78 10.20 637.16 Ash Pore Water AB-21SS 647.06 565.92 555.92 10.26 634.80 Shallow AB-22BR 645.03 442.00 437.00 44.89 600.14 Bedrock AB-22BRL 645.09 402.32 397.32 40.25 604.84 Bedrock AB-22D 644.81 485.11 480.11 44.92 599.89 Deep AB-22S 644.89 560.16 545.16 49.64 595.25 Shallow AB-23BRU 646.47 525.40 520.40 67.07 579.40 Deep AB-23S 646.61 618.38 603.38 8.19 638.42 Ash Pore Water AB-24BR 648.32 492.10 487.10 11.9 636.42 Bedrock AB-24D 647.86 535.05 530.05 11.52 636.34 Deep AB-24S 647.86 639.89 624.89 9.89 637.97 Ash Pore Water AB-24SL 647.92 619.52 609.52 10.42 637.50 Ash Pore Water AB-25BR 647.11 504.39 499.39 10.94 636.17 Bedrock AB-25BRU 646.76 536.41 531.41 10.65 636.11 Deep AB-25S 647.22 639.46 624.46 8.54 638.68 Ash Pore Water AB-25SL 646.97 614.45 599.45 10.50 636.47 Ash Pore Water AB-25SS 646.83 574.08 564.08 10.44 636.39 Shallow Page 1 of 5 TABLE S-1a MARCH 2O19 WATER LEVEL MEASUREMENTS AND ELEVATIONS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Well ID Top of Casing Elevation (ft. NAVD 88) Top of Screen Elevation (ft. NAVD 88) Bottom of Screen Elevation (ft. NAVD 88) March 2019 Measured Water Level' (ft. BTOC) March 2019 Water Elevation (ft. NAVD 88) Monitoring Flow Zone AB-26D 643.42 452.05 447.05 58.23 585.19 Deep AB-26S 643.32 558.50 548.50 59.61 583.71 Shallow AB-27BR 643.11 460.50 455.50 22.59 620.52 Bedrock AB-27D 643.24 533.04 528.04 24.40 618.84 Deep AB-27S 643.25 635.53 620.53 4.79 638.46 Ash Pore Water AB-28D 644.17 486.32 481.32 14.15 630.02 Deep AB-28S 644.19 639.35 624.35 4.95 639.24 Ash Pore Water AB-29D 620.46 508.09 503.09 5.91 614.55 Deep AB-29S 620.46 615.60 600.60 7.17 613.29 Ash Pore Water AB-29SL 620.45 584.59 574.59 7.11 613.34 Ash Pore Water AB-29SS 620.33 543.60 533.60 7.51 612.82 Shallow AB-30D 621.38 483.53 478.53 30.30 591.08 Deep AB-30S 621.21 616.46 601.46 33.40 587.81 Ash Pore Water AB-31D 627.25 496.43 491.43 46.85 580.40 Deep AB-31S 627.20 569.40 554.40 48.11 579.09 Shallow AB-32D 624.40 504.63 499.63 45.05 579.35 Deep AB-32S 624.34 569.70 554.70 44.20 580.14 Shallow AB-33D 627.39 508.27 503.27 33.65 593.74 Deep AB-33S 627.00 603.96 588.96 24.49 602.51 Ash Pore Water AB-33SS 626.42 578.83 568.83 23.96 602.46 Shallow AB-34D 632.93 195.17 490.17 18.70 614.23 Deep AB-34S 632.88 613.16 598.16 17.36 615.52 Ash Pore Water AB-35BR 664.54 479.73 474.73 40.42 624.12 Bedrock AB-35D 664.55 545.65 540.65 40.60 623.95 Deep AB-35PWS 663.47 572.69 562.69 40.35 623.12 Deep AB-35S 664.47 626.62 611.62 42.17 622.30 Ash Pore Water AB-36D 626.68 531.02 526.02 3.38 623.30 Deep AB-36S 627.18 619.09 609.09 1.01 626.17 Shallow AB-37D 628.09 564.89 559.89 0.50 627.59 Deep AB-37S 628.01 621.88 606.88 3.50 624.51 Ash Pore Water AB-38BR 634.13 529.90 524.90 3.1 631.03 Bedrock AB-38D 634.41 563.62 558.62 3.45 630.96 Deep AB-38S 634.64 621.67 606.67 3.32 631.32 Ash Pore Water AB-38SS 634.57 604.72 594.72 3.22 631.35 Shallow AB-39D 637.46 551.48 546.48 14.22 623.24 Deep AB-39S 637.47 604.42 589.42 15.81 621.66 Ash Pore Water BG-01BR 694.01 522.25 512.25 54.77 639.24 Bedrock BG-01DA 693.93 559.63 554.63 55.07 638.86 Deep BG-01S 695.13 640.63 625.63 58.10 637.03 Shallow BG-02BRA2 644.03 510.25 500.25 54.73 589.30 Bedrock BG-02D 644.22 534.33 529.33 55.20 589.02 Deep BG-02S 644.31 588.41 573.41 53.16 591.15 Shallow BG-03D 674.44 578.99 573.99 65.00 609.44 Deep BG-03S 675.18 602.50 587.50 65.73 609.45 Shallow BG-04BR 662.08 499.01 494.01 87.69 574.39 Bedrock Page 2 of 5 TABLE S-1a MARCH 2O19 WATER LEVEL MEASUREMENTS AND ELEVATIONS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Well ID Top of Casing Elevation (ft. NAVD 88) Top of Screen Elevation (ft. NAVD 88) Bottom of Screen Elevation (ft. NAVD 88) March 2019 Measured Water Level' (ft. BTOC) March 2019 Water Elevation (ft. NAVD 88) Monitoring Flow Zone BG-04D 661.62 552.83 547.83 86.99 574.63 Deep BG-04S 662.19 580.89 565.89 85.00 577.19 Shallow CCR-11DA 580.85 492.26 487.26 7.85 573.00 Deep CCR-11S 580.34 569.56 554.56 6.41 573.93 Shallow CCR-14D 592.39 467.68 462.68 19.65 572.74 Deep CCR-14S 592.42 579.23 564.23 13.93 578.49 Shallow CCR-16BR 585.79 504.97 493.97 10.32 574.51 Bedrock CCR-16D 584.83 514.14 509.14 11.36 573.33 Bedrock CCR-16S 584.69 570.95 555.95 12.04 572.65 Shallow CCR-17D 593.47 500.10 495.10 6.92 586.55 Bedrock CCR-17S 592.95 576.89 561.89 15.05 577.90 Shallow CCR-18D 585.13 397.00 392.00 10.37 574.76 Deep CCR-18S 584.64 572.43 557.43 12.59 572.05 Shallow CCR-11DA 652.59 571.64 566.64 22.62 629.97 Deep CCR-1S 652.23 634.25 619.25 22.39 629.84 Shallow CCR-20D2 607.43 426.44 421.44 0.00 607.43 Deep CCR-20S 606.41 594.67 579.67 1.53 604.88 Shallow CCR-21D 650.67 501.45 496.45 19.93 630.74 Deep CCR-21S 651.05 629.70 614.70 20.55 630.50 Shallow CCR-22DA 653.04 487.13 482.13 20.93 632.11 Deep CCR-22S 653.22 629.77 614.77 18.79 634.43 Shallow CCR-23D 647.36 528.25 523.25 13.08 634.28 Deep CCR-23S 647.26 626.22 611.22 13.99 633.27 Shallow CCR-26BR 589.79 510.41 500.41 14.80 574.99 Bedrock CCR-26D 589.95 531.74 521.74 15.21 574.74 Deep CCR-26S 589.96 564.18 554.18 15.68 574.28 Shallow CCR-21D 643.94 518.23 513.23 22.10 621.84 Deep CCR-2S 643.60 627.37 612.37 19.15 624.45 Shallow CCR-31DA 643.60 525.68 520.68 47.06 596.54 Deep CCR-3S 642.78 616.03 601.03 27.88 614.90 Shallow CCR-41DA 627.83 492.54 487.54 35.08 598.01 Deep CCR-4SA 629.20 602.04 587.04 27.63 607.16 Shallow CCR-51D 617.73 493.24 488.24 24.93 596.52 Deep CCR-5S 618.16 602.45 587.45 22.87 599.47 Shallow CCR-61D 608.43 479.30 474.30 21.00 589.96 Deep CCR-6S 608.73 598.48 583.48 17.27 596.05 Shallow CCR-71D 597.65 464.71 459.71 11.97 590.92 Deep CCR-7S 597.95 588.43 573.43 12.83 590.69 Shallow CCR-81D 590.93 465.10 460.10 8.33 587.75 Deep CCR-8S 590.93 580.96 565.96 8.00 588.66 Shallow CCR-91D 584.03 489.28 484.28 2.71 581.32 Deep CCR-9S 583.81 576.43 561.43 4.03 579.78 Shallow CCR-BG-IDA 661.17 535.79 530.79 30.67 628.87 Deep CCR-BG-1S 660.37 617.39 602.39 28.50 627.50 Shallow CP-1D 591.50 509.85 499.85 7.75 583.75 Dee Page 3 of 5 TABLE S-1a MARCH 2O19 WATER LEVEL MEASUREMENTS AND ELEVATIONS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Well ID Top of Casing Elevation (ft. NAVD 88) Top of Screen Elevation (ft. NAVD 88) Bottom of Screen Elevation (ft. NAVD 88) March 2019 Measured Water Level' (ft. BTOC) March 2019 Water Elevation (ft. NAVD 88) Monitoring Flow Zone CP-IS 591.15 561.72 551.72 5.42 585.73 Shallow CP-2D 589.06 532.36 522.36 11.99 577.07 Deep CP-2S 589.17 559.72 549.72 13.02 576.15 Shallow CP-31D 576.47 495.45 485.45 7.81 568.66 Deep CP-3S 576.56 550.80 540.80 7.95 568.61 Shallow CP-4D 576.37 513.49 503.49 7.10 569.27 Deep CP-4S 576.29 553.37 543.37 8.07 568.22 Shallow CP-5D 580.89 531.38 521.38 9.63 571.26 Deep CP-5S 580.79 561.14 551.14 7.88 572.91 Shallow CP-6BR 583.18 351.53 340.53 12.38 571.15 Bedrock CP-61D 582.69 509.26 499.26 10.74 571.95 Deep CP-6S 582.85 563.21 553.21 10.05 572.80 Shallow GWA-01BR 629.37 509.72 504.72 9.62 619.75 Bedrock GWA-01D 629.38 548.53 543.53 9.58 619.80 Deep GWA-01S 629.27 621.53 606.53 8.85 620.42 Shallow GWA-02D 579.66 459.27 454.27 1.44 578.22 Deep GWA-02S 579.36 566.45 551.45 13.29 566.07 Shallow GWA-03BRA 583.81 408.65 398.65 8.66 575.15 Bedrock GWA-03BRL2 580.61 119.17 109.17 0 580.61 Bedrock GWA-03D 580.30 438.47 433.47 5.13 575.17 Deep GWA-03S 583.59 570.59 555.59 9.85 573.74 Shallow GWA-04BR 580.02 432.53 427.53 7.24 572.78 Bedrock GWA-04BRL 580.32 372.46 362.46 7.12 573.20 Bedrock GWA-04D 580.30 485.45 480.45 7.68 572.62 Deep GWA-04S 580.32 573.54 558.54 7.09 573.23 Shallow GWA-05BRA 581.18 442.78 437.78 8.23 572.95 Bedrock GWA-05BRL 581.16 246.46 236.46 7.65 573.51 Bedrock GWA-05D 581.02 470.17 465.17 8.04 572.98 Bedrock GWA-05S 580.93 569.30 554.30 7.49 573.44 Shallow GWA-06BRA 629.48 444.48 439.48 37.67 591.81 Bedrock GWA-06BRL 630.61 338.05 328.05 38.52 592.09 Bedrock GWA-06DA 630.16 508.49 503.49 38.35 591.81 Deep GWA-06S 628.35 603.04 588.04 30.08 598.27 Shallow GWA-07D 594.27 459.69 454.69 13.37 580.90 Deep GWA-07S 595.05 577.40 562.40 8.17 586.88 Shallow GWA-08D 676.66 554.08 549.08 65.67 610.99 Deep GWA-08S3 676.88 630.43 615.43 BP BP Shallow GWA-09BR 648.04 501.25 496.25 6.35 641.69 Bedrock GWA-09D 647.74 536.39 531.39 5.96 641.69 Deep GWA-09S 647.57 638.63 623.63 6.71 640.85 Shallow GWA-14DA 654.05 550.09 545.09 18.95 635.10 Deep GWA-14S 653.57 634.80 619.80 18.45 635.12 Shallow GWA-15D 633.27 548.99 543.99 3.88 629.39 Deep GWA-15S 632.71 616.05 601.05 2.92 629.79 Shallow GWA-16D 656.06 554.57 544.57 51.33 604.73 Dee Page 4 of 5 TABLE S-1a MARCH 2O19 WATER LEVEL MEASUREMENTS AND ELEVATIONS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Well ID Top of Casing Elevation (ft. NAVD 88) Top of Screen Elevation (ft. NAVD 88) Bottom of Screen Elevation (ft. NAVD 88) March 2019 Measured Water Level' (ft. BTOC) March 2019 Water Elevation (ft. NAVD 88) Monitoring Flow Zone GWA-16S 656.59 608.37 593.37 52.37 604.22 Shallow GWA-17D 681.72 564.34 554.34 65.27 616.45 Deep GWA-17S 681.89 610.18 595.18 64.62 617.27 Shallow GWA-18D 651.14 561.60 556.60 21.67 629.47 Deep GWA-18S 651.04 593.38 578.38 21.55 629.49 Shallow GWA-19D 669.95 545.02 540.02 41.18 628.77 Deep GWA-19S 669.85 627.98 612.98 38.94 630.91 Shallow GWA-21BR 671.74 470.07 465.07 29.73 642.01 Bedrock GWA-21DA 670.02 491.07 486.07 27.71 642.31 Deep GWA-21S 671.24 644.92 629.92 22.04 649.20 Shallow GWA-22D 665.29 485.29 480.29 27.15 638.14 Deep GWA-22S 665.14 640.27 625.27 24.84 640.30 Shallow GWA-23D 669.26 589.38 584.38 25.08 644.18 Deep GWA-23S 670.09 647.04 632.04 25.92 644.17 Shallow GWA-24BR 675.45 514.96 510.06 36.03 639.42 Bedrock GWA-24D 675.59 552.53 547.53 35.46 640.02 Deep GWA-24SA 675.74 642.80 627.80 35.10 640.93 Shallow GWA-26D 683.12 568.27 553.27 45.04 638.08 Deep GWA-26S 683.10 637.66 612.66 45.06 638.04 Shallow Notes: 1 - Manual water levels collected on March 13, 2019 z - Artesian conditions present 3 - GWA-08S pump intake is approximately 77 feet below top of casing ft. BTOC - feet below top of casing ft. NAVD 88 - feet North American Vertical Datum of 1988 BP - field measurement recorded as water level below pump intake = - water level identified as anomolous likely due to field transcription error Prepared by: LWD Checked by: 3YT Page 5 of 5 TABLE 5-lb OCTOBER 2019 WATER LEVEL MEASUREMENTS AND ELEVATIONS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Well ID Top of Well Casing (ft. NAVD 88) Top of Screen Elevation (ft. NAVD 88) Bottom of Screen Elevation (ft. NAVD 88) October 2019October Measured Water Levels (ft. BTOC) 2019 Water Elevation (ft. NAVD 88) Monitoring Zone AB-33D 627.39 508.27 503.27 34.58 592.81 Deep AB-33S 627.00 603.96 588.96 26.59 600.41 Ash Pore Water AB-33SS 626.42 578.83 568.83 27.53 598.89 Shallow AB-34D 632.93 195.17 490.17 22.25 610.68 Deep AB-34S 632.88 613.16 598.16 19.40 613.48 Ash Pore Water AB-39D 637.46 551.48 546.48 18.15 619.31 Deep AB-39S 637.47 604.42 589.42 18.45 619.02 Ash Pore Water AB-40D 635.04 521.36 511.36 35.00 600.04 Deep AB-40SS 635.04 591.73 581.73 32.71 602.33 Shallow AB-41D 634.55 500.98 490.98 29.59 604.96 Deep AB-41SS 634.49 567.71 557.71 28.22 606.27 Shallow AB-42AP 634.10 601.12 591.12 26.85 607.25 Ash Pore Water AB-42D 634.12 518.04 508.04 30.28 603.84 Deep AB-42SS 634.00 557.58 547.58 29.02 604.98 Shallow AB-43AP 632.98 599.58 589.58 26.51 606.47 Ash Pore Water AB-43D 632.98 544.38 534.38 25.30 607.68 Deep AB-43SS 633.02 565.74 555.74 25.19 607.83 Shallow AB-44AP 633.78 616.06 606.06 DRY DRY Ash Pore Water AB-44D 633.86 504.44 494.44 27.98 605.88 Deep AB-44SS 633.75 576.84 566.84 28.01 605.74 Shallow CCR-03DA 643.60 525.68 520.68 DRY DRY Deep CCR-03S 642.78 616.03 601.03 29.39 613.39 Shallow CCR-04DA 627.83 492.54 487.54 36.40 591.43 Deep CCR-04SA 629.20 602.04 587.04 28.74 600.46 Shallow CCR-05D 617.73 493.24 488.24 21.02 596.71 Deep CCR-05S 618.16 602.45 587.45 19.15 599.01 Shallow CCR-06D 608.43 479.30 474.30 19.27 589.16 Deep CCR-06S 608.73 598.48 583.48 BP BP Shallow CCR-07D 597.65 464.71 459.71 8.88 588.77 Deep CCR-07S 597.95 588.43 573.43 9.85 588.10 Shallow CCR-08D 590.93 465.10 460.10 7.10 583.83 Deep CCR-08S 590.93 580.96 565.96 5.90 585.03 Shallow CCR-09D 584.03 489.28 484.28 5.78 578.25 Deep CCR-09S 583.81 576.43 561.43 6.35 577.46 Shallow CCR-26BR 589.79 510.41 500.41 18.04 571.75 Bedrock CCR-26D 589.95 531.74 521.74 18.38 571.57 Deep CCR-26S 589.96 564.18 554.18 18.58 571.38 Shallow CP-01D 591.50 509.85 499.85 12.31 579.19 Deep CP-01S 591.15 561.72 551.72 9.80 581.35 Shallow CP-02D 589.06 532.36 522.36 13.55 575.51 Deep CP-02S 589.17 559.72 549.72 14.32 574.85 Shallow CP-03D 576.47 495.45 485.45 10.54 565.93 Deep CP-03S 576.56 550.80 540.80 10.60 565.96 Shallow CP-04D 576.37 513.49 503.49 9.91 566.46 Deep CP-04S 576.29 553.37 543.37 10.93 565.36 Shallow CP-05D 580.89 531.38 521.38 12.37 568.52 Deep Page 1 of 2 TABLE 5-lb OCTOBER 2019 WATER LEVEL MEASUREMENTS AND ELEVATIONS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Well ID Top of Well Casing (ft. NAVD 88) Top of Screen Elevation (ft. NAVD 88) Bottom of Screen Elevation (ft. NAVD 88) October 2019October Measured Water Levels (ft. BTOC) 2019 Water Elevation (ft. NAVD 88) Monitoring Zone CP-05S 580.79 561.14 551.14 12.75 568.04 Shallow CP-06D 582.69 509.26 499.26 13.37 569.32 Deep CP-06S 582.85 563.21 553.21 14.41 568.44 Shallow CP-06BR 583.18 351.53 340.53 15.25 567.93 Bedrock GWA-06BRA 629.48 444.48 439.48 39.85 589.63 Bedrock GWA-06BRL 630.61 338.05 328.05 29.84 600.77 Bedrock GWA-06DA 630.16 508.49 503.49 40.38 589.78 Deep GWA-06S 628.35 603.04 588.04 31.34 597.01 Shallow GWA-07D 594.27 459.69 454.69 16.88 577.39 Deep GWA-07S 595.05 577.40 562.40 11.80 583.25 Shallow GWA-27D 628.22 475.67 465.67 42.24 585.98 Deep GWA-275 628.39 576.14 566.14 36.17 592.22 Shallow GWA-28BR 588.62 458.31 448.31 14.28 574.34 Bedrock GWA-28D 588.72 547.25 537.25 14.31 574.41 Deep GWA-28S 589.17 570.03 560.03 14.42 574.75 Shallow GWA-29BR 579.09 482.08 472.08 13.72 565.37 Bedrock GWA-29D 579.04 518.24 508.24 13.72 565.32 Deep GWA-29S 579.26 548.09 538.09 13.59 565.67 Shallow GWA-30D 596.34 540.15 530.15 10.88 585.46 Deep GWA-30S 596.14 1 573.57 1 563.57 1 8.96 1 587.18 1 Shallow Notes: 1 - Manual water levels collected on October 24, 2019 Z - CCR-06S pump intake is approximately 20 feet below top of casing ft. BTOC - feet below top of casing ft. NAVD 88 - feet North American Vertical Datum of 1988 BP - field measurement recorded as water level below pump intake Prepared by: LWD Checked by: MAF Page 2 of 2 TABLE S-2 GROUNDWATER BALANCE SUMMARY CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Modeling Scenario Pre -Decanting Post -Decanting Closure -in -Place Closure -by - Excavation Water Balance Components E 3 a 0 0, LL" o 3 a 0 rn E" C 3 a o 0, LLB- o 3 a 0 rn E" E 3 a o 0, LL" o 3 a o a, E" E 3 a 0 0, LL" o 3 a 0 rn T" Direct recharge to the active ash basin 40 0 71 0 4 0 25 0 Direct recharge to the retired ash basin 41 0 41 0 6 0 41 0 Direct recharge to the watershed outside of the ash basins 57 0 60 0 82 0 106 0 Ash basin ponds 428 155 0 0 0 20 0 129 Flow to drainages inside of the ash basins 0 39 0 14 0 0 0 0 Flow to drainages outside of the ash basins 0 27 0 15 0 0 0 6 Wells and septic return outside of the ash basins 12 12 12 13 15 15 17 18 Flow toward southeast of AAB 0 17 0 5 0 0 0 0 Flow towards drainage canal north of the RAB 0 5 0 3 0 0 0 0 Flow towards the coal pile 0 25 0 19 1 10 5 4 Flow through and under the dam 0 293 0 110 0 56 0 29 Notes: Flow in refers to recharge to the groundwater system Flow out refers to discharge from the groundwater system gpm - gallons per minute Prepared by: JFE Checked by: LWD Page 1 of 1 TABLE 5-3 SURFACE WATER CLASSIFICATIONS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Adjacent Surface Water Body Surface Water Classification (15A NCAC 02B .0300) Catawba River (Lake Wylie) Class B, WS-V 11 South Fork Catawba River IClass B, WS-V 11 Prepared by: LWD Checked by: CIS Notes: 1. Class B waters are protected for primary recreation which includes swimming on a frequent or organized basis and all Class C uses. 2. Class WS-V waters are generally upstream of Class WS-IV waters or waters currently or formerly used by industry for water supply. These waters are also protected for Class C uses. NCAC - North Carolina Administrative Code WS - Water Supply Page 1 of 1 TABLE 6-1 BORON CONCENTRATIONS IN GROUNDWATER BELOW SOURCE AREA CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Number Boron Boron Well Beneath of Time Period of Concentration Concentration Ash Sample Record Range in Range in Overlying (Flow Zone) Events Groundwater Pore Water (Ng/L) (Ng/L) AB-20D 06/2015 - 1810 - 6800 (deep) 14 08/2018 28.3 j - <50 (approximately 10 feet of saturated ash) AB-21SS 1 09/2018 <501 (shallow) 280 M1 - 8930 3 (approximately 40 AB-21D (deep) 14 06/2015 - 08/2018 29 j - <50 AB-21BR 13 06/2015 - 26.5 j - <50 feet of saturated ash) (bedrock) 02/2018 AB-21BRL 8 12/2016 - 26.4 j - <50 (bedrock) 08/2018 AB-23BRU 12 07/2015 - 29.1 j - 74.5 377 - 561 (approximately 15 (deep) 08/2018 feet of saturated ash) AB-24D 14 06/2015 — <50 1 190 - 658 (deep) 08/2018 (approximately 25 AB-24BR 8 12/2016 - <501 feet of saturated ash) (bedrock) 08/2018 AB-25SS 1 09/2018 1180 (shallow) 234 B - 2800 AB-25BRU 14 06/2015 - 25.9 j - <50 (approximately 40 (deep) 08/2018 feet of saturated ash) AB-25BR 13 06/2015 - 25.4 j - 54.6 (bedrock) 08/2018 AB-27D (deep) 12 06/2015 - 08/2018 253 j+ - 1500 418 - 560 (less than 5 feet of AB-27BR 8 12/2016 - 88.2 - 164 saturated ash) (bedrock) 08/2018 Page 1 of 3 TABLE 6-1 BORON CONCENTRATIONS IN GROUNDWATER BELOW SOURCE AREA CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Number Boron Boron Well Beneath of Time Period of Concentration Concentration Ash Sample Record Range in Range in Overlying (Flow Zone) Events Groundwater Pore Water (Ng/L) (Ng/L) AB-28D 06/2015 - 729 - 1150 (deep) 11 08/2018 37 j - 82.2 (less than 5 feet of saturated ash) AB-29SS 1 09/2018 604 356 - 2310 (shallow) (approximately 40 feet of saturated ash) AB-29D (deep) 14 06/2015 - 08/2018 210 - 423 809 - 996 AB-30D 12 06/2015 — 1 <50 (approximately 10 (deep) 08/2018 feet of saturated ash) AB-33SS (shallow) 1 09/2018 1820 580 - 908 (less than 5 feet of AB-33D 14 06/2015 - 150 - 190 saturated ash) (deep) 08/2018 AB-34D 12 07/2015 - <501 91 - 341 (approximately 5 feet (deep) 08/2018 of saturated ash) AB-35PWS 1 09/2018 <501 (shallow) 823 - 1110 AB-35D 14 06/2015 - 26.1 j - <50 (deep) 08/2018 (approximately 15 feet of saturated ash) AB-35BR 14 06/2015 - 32.5 j - <50 (bedrock) 08/2018 AB-37D 13 07/2015 - <501 <50 (less than 5 feet of (deep) 08/2018 saturated ash) Page 2 of 3 TABLE 6-1 BORON CONCENTRATIONS IN GROUNDWATER BELOW SOURCE AREA CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Number Boron Boron Well Beneath of Time Period of Concentration Concentration Ash Sample Record Range in Range in Overlying (Flow Zone) Events Groundwater Pore Water (Ng/L) (Ng/L) AB-38SS 1 09/2018 <501 (shallow) 68.6 - 179 (less than 5 feet of AB-38D 14 07/2015 - <501 (deep) 08/2018 saturated ash) AB-38BR 8 12/2016 - 1 <50 (bedrock) 08/2018 AB-39D 06/2015 - 96.3 - 149 (deep) 15 08/2018 76.2 - 93.9 (approximately 25 feet of saturated ash) Prepared by: LWD Checked by: CJS Notes: pg/L - micrograms per liter < - Concentration not detected at or above the adjusted reporting limit. 1 - Concentrations have not been detected at or above the reporting limit across all sampling events. j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit. j+ - Estimated concentration, biased high. B - Target analyte detected in method blank at or above the reporting limit. Target analyte concentration in sample is less than 10 times the concentration in the method blank. Analyte concentration in sample could be due to blank contamination. M1 - Matrix spike recovery was high: the associated Laboratory Control Spike (LCS) was acceptable. Page 3 of 3 TABLE 6-2 SOIL PSRG POG STANDARD EQUATION PARAMETERS AND VALUES CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Csoil = Cgw [Kd + (Ow + eaH')/Pb]df Inorganic Parameter Definition Default Units Parameters Values Csoil Calculated source NA mg/kg concentrations for soil Applicable groundwater 15A NCAC 02L Cgw target concentration: 15A Standard mg/L NCAC 02L Standard df Dilution factor' 20 unitless Soil -water partition Constituent Kd coefficient for inorganics Specific L/kg (range) 9w Water -filled soil porosity - 0.3 Lwater/Lsoil vadose soilS2 91 Air filled soil porosity - 0.13 Lair/Lsoii vadose soils' Pb Dry bulk densityz 1.6 kg/L Henry's law constant - dimensionless where: H' = Constituent H' Henry's law constant (atm - Specific',5 unitless m3/mole) x conversion factor of 41 Prepared by: LWD Checked by: PWA Notes: 1 - Default value from Soil Screening Guidance: Technical Background Document (USEPA, 1996) z - Site specific value (Murdoch et a/., 2019). Effective porosity represents unconsolidated material. 3 - DEQ default value appropriate for North Carolina 4 - Constituent Specific- Soil water partition coefficients (Kd) were obtained from the Groundwater Quality Signatures for Assessing Potential Impacts from Coal Combustion Product Leachate (EPRI, 2012). Sulfate Kd ranges from 0.1 to 2.1, based on sands/sediments and a pH range of 4.6 to 7.2 5 - a value of 0 is used for sulfate NA - Not applicable NCAC - North Carolina Administrative Code mg/kg - milligrams per kilogram mg/L - milligrams per liter L/kg - liters per kilogram Lwater/Lsoii - volume of water filled spaces per volume of soil Lair/Lsoii - volume of air filled spaces per volume of soil kg/L - kilogram per liter Page 1 of 1 TABLE 6-3 SUMMARY OF UNSATURATED SOIL ANALYTICAL RESULTS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Analytical Parameter Antimony Arsenic Beryllium Boron Cadmium Chromium Cobalt Iron Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Vanadium 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 PSRG Protection of Groundwater 0.9 5.8 63 45 3 3.8* 0.9 150 65 7.1 130 2.1 1500 1438A 0.28 350 2018 Background Threshold Values' 0.61 2.391 1.31 6.8 0.038 56.9 29.2 61162 1222 5.4 9.87 0.812 31 14 0.482 132 2019 Background Threshold ValueS2 0.61 2.358 1.77 23.1 1 48.8 67.7 60916 1927 5.4 53.5 2.3 28.73 437 0.482 131.9 Sample ID Sample Collection Date Analytical Results Background BG-01D (1-2) 04/27/2015 <6.3 <6.3 <0.32 <15.8 <0.76 15.2 13.3 35100 340 <3.2 2.2 <6.3 3.3 <305 <6.3 78.1 BG-01D (19-20.5) 04/28/2015 <6.2 <6.2 0.36 <15.5 <0.74 14.7 14.5 27600 436 <3.1 1.8 <6.2 <3.1 <304 <6.2 68.1 BG-01D (45-50) 05/01/2015 <7.6 <7.6 0.91 23.4 j+ <0.92 6.2 18.7 33600 1060 <3.8 5.3 <7.6 10.1 <363 <7.6 79.3 BG-01D (56-57) 04/30/2015 <7.2 <7.2 1.6 48.2 '- <0.86 5.6 j- 28.7 j- 51900 j- 805 j+ <3.6 12 4.3 '+ 27.4 <363 <7.2 116 j+ BG-02D (1-2.5) 05/14/2015 <8.7 <8.7 0.38 j <21.8 <1 6.7 5.6 j 51300 627 <4.4 <2.2 <6.5 3.9 j <423 <8.7 81.6 BG-02D (18-20) 05/14/2015 <7 <7 0.95 <17.6 <0.84 2.7 19.4 1 32400 1340 <3.5 <1.8 <5.3 16.7 <336 <7 77.5 BG-02D (48.5-50) 05/14/2015 <6.4 <6.4 0.34 <16.1 <0.77 <1.6 10 16300 426 <3.2 <1.6 <4.8 21.3 <304 <6.4 36.8 BG-02D (8.5-10) 05/14/2015 <6.4 <6.4 0.35 <16.1 <0.77 3.1 9.7 23100 587 <3.2 1.4 j <4.8 5.5 <315 <6.4 49 BG-02S (48.5-50) 05/19/2015 <6.1 <6.1 0.36 <15.1 <0.73 1.9 6.6 18200 574 <3 1.7 <4.5 21.3 <294 <6.1 32.3 BG-03D (1-2.5) 02/23/2015 <1.4 <3.4 0.85 <17.2 0.11 j 30.9 19.8 24900 712 <3.4 53.5 2.3 j 12 <345 <1.4 48.5 BG-03D (13.5-15) 02/23/2015 <1.2 <3 <0.36 <3 0.35 1.7 28.5 13600 962 <0.6 2.1 <3 1.5 <311 <1.2 40.9 BG-03D (18.5-20) 02/23/2015 <1.2 <1.2 0.071 j <3 <0.14 7.6 3.9 6400 172 0.69 0.78 <1.2 1.3 <291 <1.2 15.3 BG-03D (62-64) 03/02/2015 <3 <3 0.26 j 13.4 <0.36 1 8.8 17800 524 <0.6 1.8 <3 15.5 <295 <3 45.9 BGSB-BG-01 (14-15) 08/30/2017 <0.57 1 B 0.97 <2.5 0.064 3.4 43 20000 740 <2 3.7 0.34 j 1.4 <12 0.43 73 BGSB-BG-01 (24-25) 08/30/2017 <0.59 0.94 B 1.8 <6.8 0.038 17 53 58000 1700 <5.4 22 0.49 j 1.5 j <14 0.31 130 BGSB-BG-01 4-5 08/30/2017 <0.53 1.9 B 0.61 <2.8 <0.027 8.7 1.9 41000 170 <2.2 4.4 0.59 j 1 <12 0.14 91 BGSB-BG-02 (14-15) 08/30/2017 0.25 j 0.7 B 0.55 <2.9 <0.026 2.8 13 20000 620 <2.3 2.7 <1.4 9 <12 M 0.27 57 BGSB-BG-02 (24-25) 08/30/2017 <0.56 0.78 B 1.1 <2.8 0.02 j 2.6 12 18000 570 <2.3 2.7 <1.5 14 <12 0.29 72 BGSB-BG-02 (4-5) 08/30/2017 0.12 j,M 1.5 B,M 0.91 M <3.2 M <0.031 6.9 8.8 40000 M 400 <2.5 M 5.9 0.5 j 6.2 <13 M 0.26 93 M BGSB-BG-03 (24-25) 08/31/2017 <0.55 0.9 B 0.81 <2.8 <0.028 2.3 17 17000 400 <2.2 2.6 0.34 j 2.9 <12 0.3 66 BGSB-BG-03 (34-35) 08/31/2017 <0.56 0.96 B 0.9 <5.6 0.036 2.3 11 18000 820 <4.5 1.9 j 0.3 j 17 <11 0.21 67 BGSB-BG-03 4-5 08/31/2017 <0.61 1.7 B 1.9 <17 0.045 71 59 52000 1200 <14 67 0.6 j 6.2 j <14 0.33 88 BGSB-GW-08 (14-15) 08/31/2017 <0.61 1.3 B 0.99 <3 <0.031 22 3.4 41000 150 <2.4 7.8 j 0.45 j 26 <13 0.056 j 110 BGSB-GW-08 (24-25) 08/31/2017 <0.53 0.85 B 1.1 <6 <0.027 12 8.9 32000 470 <4.8 8.3 0.47 j 28 <13 0.094 j 84 BGSB-GW-08 (4-5) 08/31/2017 0.16 j 1.6 B 1.1 <2.9 <0.03 28 3.8 48000 170 <2.3 7.1 0.83 j 5.3 32 0.097 j 100 BGSB-GWA-23 (14-15) 08/30/2017 <0.67 1.1 B 0.9 <2.7 <0.033 1.3 28 13000 410 <2.2 4.3 <1.7 0.67 j <14 0.19 54 BGSB-GWA-23 (21-22) 08/30/2017 <0.6 0.82 B 0.85 <6.1 <0.03 2.5 12 18000 590 <4.9 2.5 j 0.35 j 0.99 j <13 0.28 53 BGSB-GWA-23 4-5 08/30/2017 <0.54 1.9 B 0.54 <2.7 <0.027 7.1 1.9 26000 110 <2.2 3.5 0.5 j 0.81 j <13 0.14 77 BGSB-GWA-26 (14-15) 08/30/2017 <0.56 0.87 B 0.74 <3 <0.028 2.8 14 20000 560 <2.4 2.5 <1.5 6.7 <13 0.34 66 BGSB-GWA-26 (24-25) 08/30/2017 0.25 j 0.73 B 0.73 <2.8 0.03 3.7 20 18000 680 <2.2 2.5 <1.4 4.1 <12 0.3 61 BGSB-GWA-26 (4-5) 08/30/2017 <0.6 1.6 B 0.7 <2.8 <0.03 6.6 4.5 32000 230 <2.2 3.9 j 0.51 j 6.2 <14 0.21 85 GWA-08D (38.5-40) 02/18/2015 <1.5 <3.7 1.3 41.3 <0.18 47.3 32.6 44300 j+ 1190 <0.75 20.8 <3.7 <7.5 <372 <1.5 90 GWA-08D (48.5-50) 02/18/2015 <1.5 <3.6 1.5 42.5 <0.18 48.8 39.8 43000 j+ 1280 <7.3 50.6 <3.6 <7.3 <375 <1.5 89.9 GWA-14D (0-2) 06/09/2015 <7.2 <7.2 <0.36 <18 <0.86 18.6 <7.2 40400 186 <3.6 4 <7.2 5.1 <355 <7.2 101 GWA-14D (10-12) 06/09/2015 <9.2 <9.2 <0.46 <23.1 <1.1 4.9 5.7 j 34700 501 <4.6 5.1 <9.2 <4.6 <437 <9.2 89.8 GWA-14D 18-20 06/09/2015 <7.1 <7.1 0.39 <17.8 <0.85 7.6 20.7 30400 454 <3.6 5 <7.1 <3.6 <358 <7.1 85.5 Beyond Ash Basin Waste Boundary AB-09 (0.5-1) 04/11/2019 <0.61 1.3 1.5 <9.2 <0.16 19 17 42000 680 <2.4 16 0.63 j 22 64 0.34 87 AB-09 (2-3) 04/11/2019 <0.58 1.4 0.91 <2.9 <0.15 22 6.5 25000 190 <2.3 11 0.58 j 5.2 120 0.2 56 AB-10 (0.5-1) 04/11/2019 <0.63 1.8 0.74 <9.4 0.058 j 28 6 42000 380 <2.5 14 0.6 j 8.7 <13 0.26 100 AB-10 (2-3) 04/11/2019 <0.65 2.6 0.87 <13 <0.17 53 5 59000 95 <2.6 21 <1.7 8.3 29 0.26 130 Page 1 of 3 TABLE 6-3 SUMMARY OF UNSATURATED SOIL ANALYTICAL RESULTS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Analytical Parameter Antimony Arsenic Beryllium Boron Cadmium Chromium Cobalt Iron Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Vanadium 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 PSRG Protection of Groundwater 0.9 5.8 63 45 3 3.8* 0.9 150 65 7.1 130 2.1 1500 1438A 0.28 350 2018 Background Threshold Values' 0.61 2.391 1.31 6.8 0.038 56.9 29.2 61162 1222 5.4 9.87 0.812 31 14 0.482 132 2019 Background Threshold ValueS2 0.61 2.358 1.77 23.1 1 48.8 67.7 60916 1927 5.4 53.5 2.3 28.73 437 0.482 131.9 Sample ID Sample Collection Date Analytical Results Beyond Ash Basin Waste Boundary (Continued) AB-11 (0.5-1) 04/11/2019 <0.58 0.72 0.56 <8.7 <0.15 32 12 34000 550 <2.3 10 0.65 j 5.5 25 0.15 84 AB-11 (2-3) 04/11/2019 <0.54 0.81 0.56 <8.1 <0.14 27 9.2 29000 250 <2.2 11 <1.4 6 20 0.19 71 CCR-23 (0.5-1) 04/11/2019 <0.61 0.9 0.75 <9.1 <0.16 12 4.4 49000 220 <2.4 7.4 0.81 j 9.4 56 0.15 j 110 CCR-23 (2-3) 04/11/2019 <0.6 1.3 0.73 <9 <0.16 18 5.5 41000 270 <2.4 11 0.71 j 8.5 13 M 0.2 92 CCR-26 (0.5-1) 04/11/2019 <0.55 2.9 0.52 <11 <0.14 31 4.7 45000 140 <2.2 7.4 0.93 j 4.6 93 0.23 110 CCR-26 (2-3) 04/11/2019 <0.62 1.5 0.42 <9.3 <0.16 9.9 3.6 45000 170 <2.5 4.1 0.79 j 1.8 130 0.088 j 110 CP-01SB (2-3) 11/16/2018 <0.55 1.4 0.33 <8.2 <0.14 11 4.5 49000 190 <2.2 7.4 0.58 j 2.4 <14 0.2 120 CP-02SB (2-3) 11/13/2018 <0.64 21 0.24 <16 <0.17 29 17 100000 290 <2.6 27 1 j 23 410 0.31 220 CP-02SB (5-6) 11/13/2018 <0.56 5.4 0.25 <8.4 0.1 j 58 25 42000 5400 <2.3 19 1.3 j 6.9 210 M 0.59 92 CP-02SB (8-9) 11/13/2018 <0.65 1.9 0.41 <9.8 <0.17 38 16 62000 420 <2.6 19 0.89 j 2.9 470 M 0.16 j 170 CP-03SB (2-3) 11/17/2018 <0.54 1.8 0.19 <5.4 <0.14 16 12 41000 420 <2.1 14 <1.4 9.4 410 0.27 110 CP-03SB (5-6) 11/17/2018 <0.65 <3.3 0.45 <6.5 <0.17 18 36 58000 1100 <2.6 18 <8.5 2.6 1000 0.23 130 CP-04SB (4-5) 11/30/2018 <0.61 29 0.73 <6.1 0.053 j 19 11 45000 460 <2.4 12 0.9 j 15 1300 0.57 84 GWA-01 (0.5-1) 04/11/2019 <0.6 1.3 0.73 <8.9 <0.16 19 9 41000 630 <2.4 12 <1.6 6.4 49 0.22 88 GWA-01 (2-3) 04/11/2019 <0.61 2.7 0.86 <9.2 <0.16 26 15 42000 1900 <2.4 21 <1.6 5.1 76 0.42 93 GWA-02 (0.5-1) 04/11/2019 <0.58 1.2 0.73 1.8 j 0.06 j 25 9.4 26000 1300 <2.3 12 1.3 j 9.4 <12 0.31 61 GWA-02 (1-2) 04/11/2019 <0.58 0.98 0.73 1.7 j 0.044 j 25 9.8 25000 1300 <2.3 12 1.4 j 11 16 0.29 58 GWA-03 (0.5-1) 04/11/2019 <0.59 0.73 0.64 <8.8 <0.15 19 6 46000 310 <2.4 10 0.65 j 5.7 120 0.14 j 96 GWA-03 (2-3) 04/11/2019 <0.72 1.9 0.5 <11 <0.19 16 1.7 47000 170 <2.9 8.8 <1.9 1.8 48 0.12 j 89 GWA-03BR (8.5-10) 04/11/2015 <7.3 <7.3 0.27 j <18.3 <0.88 5.7 12.7 23700 309 <3.7 2.1 <7.3 10.5 <360 <7.3 64.2 GWA-05 (0.5-1) 04/11/2019 <0.56 2.4 0.84 <8.3 0.064 j 14 11 33000 450 <2.2 12 0.68 j 14 37 0.3 75 GWA-05 (2-3) 04/11/2019 <0.58 1.1 0.78 <8.6 0.04 j 22 8.9 35000 390 <2.3 11 0.85 j 6.7 47 0.23 84 GWA-05D (2-4) 05/14/2015 <6.2 <6.2 0.75 <15.5 <0.74 9.5 16.2 24200 578 <3.1 6.2 2.5 j 7 489 <6.2 70.8 GWA-06D (28.5-30) 03/03/2015 <3.4 2.1 j 0.41 15.7 <0.4 2.3 21.7 18600 1350 <0.67 6.3 1.8 j 7.9 745 <3.4 56.4 GWA-07 (0.5-1) 04/11/2019 <0.57 1.9 0.62 <8.6 <0.15 21 9.7 34000 720 <2.3 13 0.91 j 16 21 0.2 66 GWA-07 (2-3) 04/11/2019 <0.63 M 3.7 M 0.85 <8.9 0.12 j 34 7.6 M 42000 M 400 M <2.4 18 1.2 j 15 26 0.25 80 GWA-09S (4-6) 05/11/2015 <7.2 <7.2 0.53 <18.1 <0.87 2.6 12.7 25600 652 <3.6 2.1 <7.2 17 <363 <7.2 63.3 GWA-15D (1.9-2) 06/08/2015 <7.2 <7.2 <0.36 <18 <0.86 10.1 3.8 j 22400 302 <3.6 3.6 <7.2 6.2 <374 <7.2 57.4 GWA-27SB (10-11) 10/08/2019 <0.78 1.3 0.57 <3.9 <0.2 6.7 6.7 32000 210 <3.1 5.6 1.4 j 3.7 15 j 0.25 60 GWA-27SB (14-15) 10/08/2019 <0.74 1.8 1.7 <11 <0.19 60 16 98000 210 <3 16 3.8 j 0.75 j <15 M 0.083 j 210 GWA-27SB (19-20) 10/08/2019 <0.75 2.9 1.7 <11 <0.19 62 48 87000 1200 <3 27 5.1 j 1 j 200 0.14 j 200 GWA-28SB (11-12) 10/15/2019 <0.7 1.3 0.87 <7 <0.18 13 26 38000 800 <2.8 9.9 3.3 j 10 260 0.19 100 GWA-28SB (14-15) 10/15/2019 <0.66 1.1 0.81 <3.3 <0.17 4.2 23 27000 690 <2.7 5.9 3.2 j 22 160 0.18 68 Page 2 of 3 TABLE 6-3 SUMMARY OF UNSATURATED SOIL ANALYTICAL RESULTS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Analytical Parameter Antimony Arsenic Beryllium Boron Cadmium Chromium Cobalt Iron Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Vanadium 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 PSRG Protection of Groundwater 0.9 5.8 63 45 3 3.8* 0.9 150 65 7.1 130 2.1 1500 1438A 0.28 350 2018 Background Threshold Values' 0.61 2.391 1.31 6.8 0.038 56.9 29.2 61162 1222 5.4 9.87 0.812 31 14 0.482 132 2019 Background Threshold ValueS2 0.61 2.358 1.77 23.1 1 48.8 67.7 60916 1927 5.4 53.5 2.3 28.73 437 0.482 131.9 Sample ID Sample Collection Date Analytical Results GWA-29SB (10-11) 09/13/2019 <0.61 2.9 0.51 <5.2 0.16 17 12 41000 560 <2.1 it 2 16 270 0.2 B 58 GWA-30SB (2-3) 08/26/2019 <0.64 1.1 1.2 2.8 j <0.17 3.2 11 36000 410 <2.3 12 4.9 26 700 0.4 B 120 GWA-30SB (5-6) 08/27/2019 <0.65 1.4 1.3 3.3 j <0.17 4.2 13 31000 550 <2.7 12 3.4 34 610 0.41 B 110 Within Ash Basin Waste Boundary AB-22D (13-14.5) 06/15/2015 <8.1 <8.1 <0.4 <20.2 <0.97 6.6 6.4 j 29700 332 <4 3.5 <8.1 2.7 j <405 <8.1 85.1 AB-26D (13.5-15) 06/16/2015 <6.4 <6.4 <0.32 <16 <0.77 15.9 14.9 33800 800 <3.2 4.8 <6.4 2 j <320 <6.4 76.5 AB-26D (33.5-35) 06/16/2015 <6.2 <6.2 0.35 <15.5 <0.74 7.4 j 14.2 28100 890 j <3.1 5.1 <6.2 2.4 j <322 <6.2 69.8 AB-31D (13.5-15) 04/20/2015 <5.9 <5.9 0.26 j 37 <0.71 12.7 8.7 47600 350 j+ <3 2.6 <5.9 3.5 170 j <5.9 67.8 AB-31D (33.5-35) 04/20/2015 <6.6 <6.6 0.44 13.7 j <0.79 13 14.6 15400 297 j+ <3.3 4.9 <6.6 3.1 j <337 <6.6 42.5 AB-32S (13.5-15) 05/05/2015 <6.4 3.4 j+ 0.96 23.7 j+ <0.76 17.2 56.8 34300 952 <3.2 6 <6.4 5.6 <301 <6.4 80.7 AB-32S (33.5-35) 05/05/2015 <6.1 <30.7 0.66 20 j+ <0.74 14.5 82.3 26800 822 <3.1 10.4 <6.1 4.2 <297 <6.1 77.8 AB-34D (14-14) 02/10/2015 <3.5 39.8 1.7 18.5 <0.41 14.9 5.8 5090 58.1 0.6 j 10.4 3.7 101 193 j <3.5 39.9 SB-01 (3-5) 02/12/2015 <1.4 44.5 1.6 10.1 0.27 11.8 5.2 4320 j+ 41.2 j+ 1.1 9.8 2 176 <357 <1.4 40.2 SB-02 (18.5-20) 02/11/2015 <3.5 <7 0.61 40.7 <0.84 3.8 30.1 39800 1640 <7 3.2 j <7 1.2 <345 <3.5 87.3 SB-04 (25-26.5) 02/10/2015 <3.7 <3.7 0.47 45.7 <0.44 31.1 7.9 46600 476 <7.4 4.6 <3.7 0.6 j <367 <3.7 70 Prepared by: JHG Checked by: LWD / EMY Notes: ' - Background threshold values were calculated using data from background unsaturated soil samples collected February 2015 to May 2015. Z - Background threshold values were calculated using data from background unsaturated soil samples collected February 2015 to August 2017. 0 - bold highlighted concentration indicates value is greater than applicable regulatory standard (PSRG POG). 0 - bold highlighted concentration indicates value is greater than greatest background threshold value where there is no regulatory standard, or background threshold values are greater than regulatory standard. 0 - highlighted concentration indicates value is either within range of background threshold values for constituents where there is no regulatory standard/background threshold values are greater than regulatory standard, or within range of background threshold value and the regulatory standard. PSRG - Preliminary Soil Remediation Goals for the Protection of Groundwater (POG); NCDEQ Inactive Hazardous Sites Branch (IHSB) Preliminary Soil Remediation Goals table (February 2018) * - North Carolina PSRG POG is for hexavalent chromium, soil analytical is for total chromium. < - Concentration not detected at or above the adjusted reporting limit. ^ - PSRG Protection of Groundwater value was calculated using the equation shown in Section 6.1.2 mg/kg - milligrams per kilogram 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. j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit. j- Estimated concentration, biased low. j+ - Estimated concentration, biased high. M - Matrix spike / matrix spike dup failure. Page 3 of 3 TABLE 6-4 SOURCE AREA INTERIM ACTIONS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Interim Actions Remedy Active source remediation by removing ponded water in the active ash basin. Decanting will lower the hydraulic head within the coal ash basin and reduce hydraulic Active Ash Basin Decanting gradients, generally reducing groundwater seepage velocities and COI transport potential. Decanting will return the groundwater flow system to its approximate condition, prior to construction of the active ash basin, with the re-establishment of natural groundwater flow. Retired ash basin dam (GASTO-016) modifications including spillway repair, installation of new principal spillway, vegetation/tree removal, and slope repair were Source Area Stabilization completed. Active ash basin dam (GASTO-061) modifications including spillway repair, installation of new principal spillway, and slope repair were completed. Control and management of storm water runoff from the coal pile area was improved by construction of a Lined Holding Basin lined holding basin between the main and live coal piles. Construction Improved handling of the storm water in this area impedes migration of COIs potentially derived from contact with the coal stored in this area. Notes: COI - Constituent of Interest Prepared by: LWD Checked by: CJS Page 1 of 1 TABLE 6-5 MEANS OF GROUNDWATER COIs - JANUARY 2018 TO JUNE 2019 AND OCTOBER 2019 CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY, CAROLINAS, LLC, BELMONT, NC Analytical Parameters Antimony Arsenic Beryllium Boron Cadmium Chromium (VI) Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Total Dissolved Solids Vanadium Reporting Units L L L L L L L L L L L L L L L m L L m L L 15A NCAC 02L Standard 1* 10 4* 700 2 NE 10 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* 2018 Background Threshold Values Shallow Flow Zone 0.76 0.59 0.12 50 1 2.2 6.8 1.5 884 NE 225 0.844 5.8 0.5 298 1.5 0.1 163 5.7 2019 Background Threshold Values Shallow Flow Zone 1 0.71 0.13 50 0.08 2.3 9.1 5.7 1 422 3 608 6.7 8.9 0.5 300 5.4 0.1 154 3.9 2019 Background Dataset Range Shallow Flow Zone 0.084 - <1 0.048 - 2.3 0.01 S1 - 0.22 4.4 - < 50 0.028 <0.08 0.013 j - 3.2 0.11 j - 37.6 0.038 - 19.2 29 j - 2940 0.16 - 3.6 2.8 1 - 1620 0.09 j - 10.7 0.14 j - 26.2 0.32 - <0.5 2.6 1 - 309 <0.1 - 10.7 0.017 j - <0.2 15 - < 250 0.088 j - 7.5 2018 Background Threshold Values (Deep Flow Zone 1 1 0.03 50 1 1.3 6.8 1 356 NE 26.2 1.8 5 0.62 232 5.4 0.1 158 11.5 2019 Background Threshold Values (Deep Flow Zone 0.69 1.1 1 50 1 1.5 16.1 0.82 665 25.3 256 26.2 10.3 0.75 240 14.5 0.1 173 16.1 2019 Background Dataset Range Dee Flow Zone 0.096 j - 0.85 0.048 j - 1.4 0.01 j - <1 5.8 - 50.3 0.035 - <1 0.015 - 1.8 0.23 B S1 - 93.2 0.019 - 4.6 27.5 B - 823 0.89 - 44.9 2.7 - 900 0.21 - 30.2 0.16 - 52.6 0.34 - 1.2 31 - 251 0.5 - 22 0.016 - <0.1 43 - 280 1.2 - 17.9 2018 Background Threshold Values Bedrock Flow Zone 0.5 1.6 0.1 50 0.08 0.23 5.6 0.3 284 NE 278 8.9 3.4 0.5 154 2.9 0.1 165 15.9 2019 Background Threshold Values Bedrock Flow Zone 2.6 1.6 0.1 50 0.08 0.77 10.2 0.35 1,242 26.3 360 11 6.9 0.5 181 7.3 0.1 221 12.5 2019 Background Dataset Range Bedrock Flow Zone 0.271- 3.9 0.24- 1.6 0.01 - < 0.1 35.6 j - < 50 <0.08 <0.025 - 0.66 0.33 j - 8.9 0.021 j - 0.311 40.7 i - 715 0.9 i - 26.3 2.8 - 278 1.7 - 10.5 0.22 j - 5.8 0.17 i - < 0.5 97.7 - 223 1.8 - 33.3 0.02 i - < 0.1 104 - 222 7.5 - 15.9 Sample ID Flow Zone Means Results Background Locations° AB-12D Deep < 0.5 0.1 < 0.1 < 50 < 0.08 0.51 0.59 < 0.1 86 < 2.5 < 5 0.24 < 0.5 0.61 181 3.9 < 0.1 103 3.7 AB-12S Shallow < 0.5 < 0.1 0.06 < 50 < 0.08 0.15 0.43 0.6 265 < 2.5 49 < 0.5 < 0.5 < 0.5 < 5 < 1 < 0.1 45 0.6 BG-01BR Bedrock 0.62 1 < 0.1 37 < 0.08 0.38 1 0.1 106 < 2.5 19 8.2 0.71 < 0.5 164 5.8 < 0.1 163 8.1 BG-01DA Deep < 0.5 0.23 < 0.1 < 50 < 0.08 0.28 1.7 0.1 68 1.3 4 1.3 1.3 < 0.5 114 2.3 < 0.1 108 9.7 BG-01S Shallow < 0.5 0.19 < 0.1 < 50 < 0.08 0.33 2.3 0.1 334 < 2.5 11 < 0.5 2.3 < 0.5 30 < 1 < 0.1 36 0.84 BG-02BRA-2 Bedrock 2.1 1.3 < 0.1 < 50 < 0.08 0.99 1.5 0.1 71 37.4 5 7.9 0.88 < 0.5 218 19.8 < 0.1 187 10.8 BG-02D Deep < 0.5 0.22 < 0.1 < 50 < 0.08 0.98 1.3 0.1 144 10.5 7 0.92 0.55 < 0.5 180 1.1 < 0.1 116 8.4 BG-02S Shallow < 0.5 0.18 < 0.1 < 50 < 0.08 1.8 2.0 0.1 199 0.55 11 < 0.5 0.56 < 0.5 184 < 1 < 0.1 137 2.1 BG-03D Deep < 0.5 0.13 < 0.1 < 50 < 0.08 0.45 0.73 < 0.1 < 50 2.9 < 5 0.32 < 0.5 < 0.5 209 < 1 < 0.1 114 6.5 BG-03S Shallow < 0.5 0.16 < 0.1 < 50 < 0.08 1.3 1.7 0.1 323 2.8 17 0.22 0.86 < 0.5 263 < 1 < 0.1 135 3.3 BG-04BR Bedrock < 0.5 0.28 < 0.1 < 50 < 0.08 0.23 1.5 0.1 207 1.5 11 1.9 0.87 < 0.5 99 2.2 < 0.1 125 9.1 BG-04D Deep < 0.5 0.25 < 0.1 < 50 < 0.08 0.72 1.1 0.2 310 5 92 2.1 0.61 < 0.5 199 1.5 < 0.1 150 7 BG-04S Shallow < 0.5 0.23 < 0.1 < 50 < 0.08 0.16 1.8 0.2 249 < 2.5 34 0.32 4.6 < 0.5 289 < 1 < 0.1 141 2.4 CCR-BG-01DA Deep 0.46 0.27 < 0.1 6 < 0.08 0.58 0.2 14.3 6.5 < 0.5 < 1 < 0.1 114 CCR-BG-01S Shallow < 0.5 < 0.1 < 0.1 6 < 0.08 1.4 1.4 0.75 < 0.5 < 0.5 1.2 < 0.1 29 GWA-16D Deep < 0.5 0.21 < 0.1 < 50 < 0.08 0.56 1.6 0.1 165 1.6 9 0.44 0.84 < 0.5 119 1 < 0.1 72 7.9 GWA-16S Shallow < 0.5 0.21 < 0.1 < 50 < 0.08 0.48 1.3 0.2 228 2.4 49 3.7 2.2 < 0.5 191 0.7 < 0.1 101 1.1 GWA-19D Deep 0.33 0.3 < 0.1 < 50 < 0.08 0.57 0.62 < 0.1 55 39.7 < 5 1.4 < 0.5 < 0.5 191 4.2 < 0.1 153 10.5 GWA-19S Shallow < 0.5 0.29 < 0.1 < 50 < 0.08 0.79 1.4 0.2 250 < 2.5 17 0.24 1.2 < 0.5 123 < 1 < 0.1 47 0.97 GWA-21BR Bedrock 1.3 0.85 < 0.1 < 50 < 0.08 0.1 1.3 0.3 657 16.0 149 5.8 0.78 < 0.5 164 2.8 < 0.1 176 12.3 GWA-21DA Deep < 0.5 0.15 < 0.1 < 50 < 0.08 1.1 1.6 0.1 187 1.8 6 0.8 0.56 < 0.5 112 1.4 < 0.1 134 15.9 GWA-21S Shallow < 0.5 < 0.1 0.17 < 50 < 0.08 0.4 0.63 1.1 97 < 2.5 78 < 0.5 1.1 < 0.5 24 < 1 < 0.1 31 0.18 GWA-23D Deep < 0.5 0.36 < 0.1 < 50 < 0.08 0.1 < 0.5 4 63 1.5 814 7.5 < 0.5 < 0.5 84 2.2 < 0.1 134 3.9 GWA-23S Shallow < 0.5 < 0.1 < 0.1 < 50 < 0.08 0.25 2.3 0.6 95 < 2.5 23 < 0.5 2.5 < 0.5 5 0.9 < 0.1 26 < 0.3 GWA-26D Dee 0.4 0.67 < 0.1 < 50 < 0.08 0.042 0.68 0.2 185 < 2.5 230 15.1 0.82 < 0.5 95 11.2 < 0.1 121 1.8 GWA-265 Shallow < 0.5 0.22 < 0.1 < 50 < 0.08 1.1 2 0.1 165 < 2.5 14 0.55 < 0.5 < 0.5 69 0.7 < 0.1 70 2.3 At or Within the Waste Boundary Locations AB-20D Deep < 0.5 0.69 < 0.1 < 50 < 0.08 1 1.1 < 0.1 54 < 2.5 < 5 3.3 < 0.5 < 0.5 130 8 < 0.1 130 10.5 AB-20S Ash Pore Water 1.2 18 < 0.1 1,836 0.085 0.17 0.99 0.29 475 161 33.8 10.1 23.4 115 1,734 134 0.26 476 6.8 AB-21BR Bedrock - - - < 50 - - - - - - - - - - - - - - - AB-21BRL Bedrock < 0.5 2 0.11 < 50 < 0.08 0.044 < 0.5 0.1 < 50 7.4 55 9.5 < 0.5 < 0.5 94 11.3 < 0.1 144 2.7 AB-21D Dee - - - < 50 - - - - - - - - - - - - - - - AB-21S Ash Pore Water 0.32 827 < 0.1 3,800 0.11 < 0.025 0.54 1 9,464 215 1,166 358 1.8 0.91 3,708 78.9 < 0.1 544 6.1 AB-21SL Ash Pore Water 3.5 494 0.053 7,746 0.28 < 0.025 < 0.5 0.54 508 282 133 2,962 3 < 0.5 1,898 131 < 0.1 405 11.5 AB-21SS Shallow 0.67 0.56 < 0.1 78 < 0.08 0.051 < 0.5 0.6 172 < 2.5 114 1.2 1.1 < 0.5 99 1.3 < 0.1 95 3.3 AB-22BR Bedrock < 0.5 0.27 < 0.1 1,834 < 0.08 0.065 1.5 0.3 441 18.0 99 2.1 3.8 < 0.5 284 26.3 < 0.1 365 1.3 AB-22BRL Bedrock < 0.5 0.27 < 0.1 1,948 < 0.08 0.043 1.7 0.2 114 2.8 9 1.5 2.8 < 0.5 349 42.7 < 0.1 259 4.3 AB-22D Deep < 0.5 0.11 < 0.1 2,010 < 0.08 0.061 1.5 0.4 445 2.3 166 0.83 3.9 < 0.5 441 37.9 < 0.1 490 5.3 AB-22S Shallow < 0.5 0.13 < 0.1 < 50 < 0.08 0.029 0.53 31.7 1,675 < 2.5 1,146 < 0.5 2.7 < 0.5 62 2.1 0.063 54 0.23 AB-23BRU Dee - - - 58 - - - - - - - - - - - - - - - AB-23S Ash Pore Water 0.95 1193 < 0.1 427 < 0.08 < 0.025 < 0.5 0.039 74.5 224 25.7 51.4 < 0.5 < 0.5 670 17.9 < 0.1 112 16.4 AB-24BR Bedrock < 0.5 0.33 < 0.1 < 50 < 0.08 0.042 < 0.5 0.1 88 1.5 85 2.1 2.1 < 0.5 103 3.6 < 0.1 97 11.4 AB-24D Dee - - - < 50 - - - - - - - - - - - - - - - AB-24S Ash Pore Water 0.94 135 < 0.1 773 < 0.08 0.029 0.41 1.9 3480 56.7 951 35.7 4.2 0.68 1,922 80 0.056 360 9.5 AB-24SL Ash Pore Water 0.47 691 < 0.1 631 < 0.08 0.03 < 0.5 < 0.1 95.3 128 37.2 57 0.56 0.51 709 18.3 < 0.1 127 2.5 AB-25BR Bedrock - - - < 50 - - - - - - - - - - - - - - - AB-25BRU Dee - - - < 50 - - - - - - - - - - - - - - - AB-25S Ash Pore Water 6.5 206 < 0.1 1,234 < 0.08 0.033 < 0.5 2 479.4 147 188 139 2.8 0.54 1364 47.9 0.14 220 28 AB-25SL Ash Pore Water 0.7 886 < 0.1 1,065 < 0.08 0.037 < 0.5 < 0.1 72.7 144 30.4 113 1.2 < 0.5 1,274 35.3 < 0.1 183 8.6 AB-25SS Shallow 0.15 0.37 < 0.1 1,213 < 0.08 0.028 0.82 1 107 1.1 314 5.0 3.1 < 0.5 237 27.2 < 0.1 152 1.2 AB-26D Deep < 0.5 0.24 < 0.1 325 < 0.08 0.33 2.2 0.3 337 9.1 100 1.3 1.9 < 0.5 225 39.8 < 0.1 183 6.2 AB-26S Shallow < 0.5 0.11 < 0.1 1,046 1 < 0.08 0.15 3.5 1.2 743 1.2 1 240 < 0.5 4.4 < 0.5 208 65.8 < 0.1 158 0.93 AB-27BR Bedrock < 0.5 0.44 < 0.1 142 < 0.08 0.039 0.35 0.2 79 6.1 192 1.8 0.72 < 0.5 166 19.9 < 0.1 203 0.72 AB-27D Deep < 0.5 2.5 < 0.1 985 < 0.08 0.061 1 0.8 791 1.3 161 2.8 1.1 1.4 361 74.4 < 0.1 205 3.9 AB-27S Ash Pore Water < 0.5 198 < 0.1 436 < 0.08 < 0.025 < 0.5 4.3 17,775 25 3 718 2 0.43 < 0.5 1,132 16.9 < 0.1 306 0.39 AB-28D Deep < 0.5 0.42 < 0.1 81 < 0.08 0.44 0.61 < 0.1 < 50 52.8 < 5 0.73 0.71 < 0.5 254 18.1 < 0.1 182 9.6 AB-28S Ash Pore Water 0.48 13.2 < 0.1 1,047 < 0.08 < 0.025 0.79 8.8 8610 8.5 2 695 10.8 3.3 1.6 2,263 194 0.36 537 < 0.3 AB-29D Deep < 0.5 0.32 < 0.1 380 < 0.08 0.47 0.62 0.4 < 50 1.9 7 0.3 3.2 < 0.5 243 49.2 < 0.1 178 6.9 AB-29S Ash Pore Water 0.53 447 < 0.1 780 < 0.08 < 0.025 < 0.5 2.5 2,564 49.7 2007 9.8 1.6 < 0.5 1,191 60.1 < 0.1 236 6.9 AB-29SL Ash Pore Water 5.2 69.9 < 0.1 2,088 < 0.08 0.036 < 0.5 < 0.1 57.3 56.5 315 22.9 < 0.5 8.4 1,073 141 < 0.1 290 59.2 AB-29SS Shallow < 0.5 0.13 < 0.1 569 < 0.08 1.4 1.8 0.2 135 < 2.5 11 0.16 0.73 < 0.5 323 94 < 0.1 230 4.9 AB-30D Deep < 0.5 0.15 < 0.1 < 50 < 0.08 0.35 0.45 0.1 < 50 1.8 3 0.16 < 0.5 < 0.5 186 26.4 1 < 0.1 152 11.9 AB-30S Ash Pore Water 0.38 297 < 0.1 549 < 0.08 0.075 < 0.5 2.1 4,312 30.8 1070 6.2 1.3 0.86 1,248 132 0.082 349 6.5 AB-31D Dee - - - 412 - - - - - - - - - - - - - - - AB-31S Shallow < 0.5 0.079 < 0.1 1 995 0.095 0.21 1.5 0.1 447 0.6 36 < 0.5 0.86 < 0.5 301 122 < 0.1 228 1.1 AB-32D Deep < 0.5 0.19 < 0.1 663 < 0.08 0.039 1.2 0.3 254 3.2 18 0.56 0.94 < 0.5 211 30.5 < 0.1 162 7.6 AB-32S Shallow < 0.5 0.64 < 0.1 < 50 < 0.08 0.038 0.8 1 .1 39,240 < 0.5 6,014 < 0.5 1.4 < 0.5 43 2 < 0.1 73 0.31 AB-33D Deep 1.1 0.24 < 0.1 190 < 0.08 0.06 1.8 0.1 68 79.2 47 0.93 1.2 < 0.5 426 7.9 < 0.1 175 3.2 AB-33S Ash Pore Water < 0.5 0.24 0.16 835 0.15 0.034 1.2 21.6 8,703 3.6 5,146 6 4.1 0.97 2,162 240 0.11 580 < 0.3 AB-33SS Shallow < 0.5 0.37 < 0.1 1,958 < 0.08 < 0.025 < 0.5 mL 3.2 814 < 2.5 717 < 0.5 1 < 0.5 30 115 < 0.1 216 0.43 AB-34D Deep < 0.5 0.14 < 0.1 < 50 < 0.08 0.44 1.7 0.2 260 < 2.5 6 0.6 2 < 0.5 128 1.3 < 0.1 98 11.5 AB-34S Ash Pore Water < 0.5 0.45 < 0.1 311 < 0.08 < 0.025 < 0.5 1.9 135,667 1.5 7,918 < 0.5 0.51 < 0.5 1,567 201 < 0.1 485 < 0.3 AB-35BR Bedrock 0.37 0.41 < 0.1 < 50 1 < 0.08 1 0.92 2.4 0.2 94 1.8 9 2.4 0.82 < 0.5 129 2.8 < 0.1 107 7.5 AB-35D Dee 0.42 0.95 < 0.1 < 50 < 0.08 3.1 < 0.1 < 50 17.3 < 5 1.8 < 0.5 < 0.5 193 3.5 < 0.1 14.8 AB-35PWS Shallow < 0.5 0.38 < 0.1 < 50 < 0.08 0.71 2.4 0.6 292 7.8 101 0.79 1.4 < 0.5 144 4.3 < 0.1 105 8.7 AB-35S Ash Pore Water < 0.5 94.8 < 0.1 1008 < 0.08 < 0.025 2 0.27 37580 183.4 6302 14.9 2.1 < 0.5 1 906 130 < 0.1 558 0.81 AB-36D Dee < 0.5 0.41 < 0.1 < 50 < 0.08 0.15 < 0.5 < 0.1 133 1.4 5 1 1.1 < 0.5 119 3.8 < 0.1 95 8 < < < < < < 0 < Page 1 of 4 TABLE 6-5 MEANS OF GROUNDWATER COIs - JANUARY 2018 TO JUNE 2019 AND OCTOBER 2019 CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY, CAROLINAS, LLC, BELMONT, NC Analytical Parameters Antimony Arsenic Beryllium Boron Cadmium Chromium (VI) Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Total Dissolved Solids Vanadium Reporting Units L L L L L L L L L L L L L L L m L L m L L 15A NCAC 02L Standard 1* 10 4* 700 2 NE 10 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* 2018 Background Threshold Values Shallow Flow Zone 0.76 0.59 0.12 50 1 2.2 6.8 1.5 884 NE 225 0.844 5.8 0.5 298 1.5 0.1 163 5.7 2019 Background Threshold Values Shallow Flow Zone 1 0.71 0.13 50 0.08 2.3 9.1 5.7 1 422 3 608 6.7 8.9 0.5 300 5.4 0.1 154 3.9 2019 Background Dataset Range Shallow Flow Zone 0.084 - <1 0.048 - 2.3 0.01 S1 - 0.22 4.4 - <50 0.028 <0.08 0.013 j - 3.2 0.11 j - 37.6 0.038 - 19.2 29 j - 2940 0.16 - 3.6 2.8 1 - 1620 0.09 j - 10.7 0.14 j - 26.2 0.32 - <0.5 2.6 1 - 309 <0.1 - 10.7 0.017 j - <0.2 15 - < 250 0.088 j - 7.5 2018 Background Threshold Values (Deep Flow Zone 1 1 0.03 50 1 1.3 6.8 1 356 NE 26.2 1.8 5 0.62 232 5.4 0.1 158 11.5 2019 Background Threshold Values (Deep Flow Zone 0.69 1.1 1 50 1 1.5 16.1 0.82 665 25.3 256 26.2 10.3 0.75 240 14.5 0.1 173 16.1 2019 Background Dataset Range Dee Flow Zone 0.096 j - 0.85 0.048 j - 1.4 0.01 j - <1 5.8 - 50.3 0.039 - <1 0.015 - 1.8 0.23 B S1 - 93.2 0.019 - 4.6 27.5 B - 823 0.89 - 44.9 2.7 - 900 0.21 - 30.2 0.16 - 52.6 0.34 - 1.2 31 - 251 0.5 - 22 0.016 - <0.1 43 - 280 1.2 - 17.9 2018 Background Threshold Values Bedrock Flow Zone 0.5 1.6 0.1 50 0.08 0.23 5.6 0.3 284 NE 278 8.9 3.4 0.5 154 2.9 0.1 165 15.9 2019 Background Threshold Values Bedrock Flow Zone 2.6 1.6 0.1 50 0.08 0.77 10.2 0.35 1,242 26.3 360 11 6.9 0.5 181 7.3 0.1 221 12.5 2019 Background Dataset Range Bedrock Flow Zone 0.271- 3.9 0.24- 1.6 0.01 - < 0.1 35.6 j - <50 <0.08 <0.025 - 0.66 0.33 j - 8.9 0.021 j - 0.311 40.7 i - 715 0.9 i - 26.3 2.8 - 278 1.7 - 10.5 0.22 j - 5.8 0.17 i - < 0.5 97.7 - 223 1.8 - 33.3 0.02 i - < 0.1 104 - 222 7.5 - 15.9 Sample ID Flow Zone Means Results At or Within the Waste Boundary Locations (Continued) AB-37D Deep < 0.5 0.27 < 0.1 < 50 < 0.08 0.16 < 0.5 < 0.1 82 1.2 < 5 1.6 < 0.5 < 0.5 146 2.6 < 0.1 130 9.3 AB-37S Ash Pore Water < 0.5 0.19 < 0.1 < 50 < 0.08 0.3 0.59 < 0.1 139 < 2.5 12.5 0.11 0.56 < 0.5 143 2.0 < 0.1 112 7.5 AB-38BR Bedrock < 0.5 0.24 < 0.1 < 50 < 0.08 0.035 0.33 0.3 < 50 2.1 74 1.9 2 < 0.5 395 15.2 < 0.1 191 5.7 AB-38D AB-38S Deep Ash Pore Water < 0.5 < 0.5 0.20 213 < 0.1 < 0.1 < 50 118 < 0.08 < 0.08 0.099 < 0.025 < 0.5 0.59 0.6 1.3 159 33980 14.8 6.3 1552 0.45 1.7 2.7 0.65 < 0.5 < 0.5 397 786 16.6 < 0.1 199 4.8 5.6 0.1 164 0.44 AB-38SS Shallow < 0.5 0.17 < 0.1 < 50 < 0.08 < 0.025 0.87 3.5 356 < 2.5 167 < 0.5 4.1 < 0.5 109 2.9 < 0.1 120 1 AB-39D Deep < 0.5 0.18 < 0.1 90 < 0.08 0.06 < 0.5 0.1 58 3.7 26 0.19 1.3 4.7 438 33.1 < 0.1 221 2.6 AB-39S Ash Pore Water < 0.5 1.8 < 0.1 119 < 0.08 < 0.025 < 0.5 1.9 59440 0.6 5488 0.25 < 0.5 < 0.5 274 3.4 < 0.1 230 0.65 AB-40D Deep <1 <1 <1 142 <1 <0.025 8 2.7 734 4.195 ' 701 2 7.86 <1 375 63 <0.2 254 2.88 AB-40SS Shallow <1 0.421 ' 1.11 1,160 <1 0.062 P4 M1 Rl RO 2.82 50.4 41,200 33 7,400 0.203 j 41.3 <1 3,240 590 0.614 942 0.564 AB-41D Deep <1 0.471 ' <1 90 <1 <0.025 5.99 0.9 ' 473 3.736 ' 412 1.69 3.89 <1 547 160 <0.2 211 2.94 AB-41SS Shallow <1 27.5 29 144 2.36 <0.025 P4 RO 0.684 ' 5050 393 8 393,000 1.21 467 12.3 1,230 2,200 0.085 ' 3,640 1 AB-42AP Ash Pore Water 4.9 206 <1 2,270 <1 0.1 0.553 ' 1.56 38,900 288 3,750 28.8 2.07 0.845 ' 4,110 430 0.231 951 1.69 AB-42D Deep <1 0.487 j <1 <50 <1 0.026 1.41 0.4 j 321 <5 71 4.2 1.06 <1 99 4.7 <0.2 117 5.36 AB-42SS Shallow <1 <1 <1 <50 <1 0.2 0.832 ' 3.3 278 <5 451 0.702 ' 4.26 <1 139 1.3 <0.2 122 2.84 AB-43AP Ash Pore Water 1.13 1,220 <1 1,880 <1 <0.025 1.5 1.4 17,800 162 2310.0 82.8 1.49 <1 3,170 160 0.187 ' 554 12 AB-43D Deep <1 <1 <1 <50 <1 1.1 2.58 0.7 ' 167 <5 65 0.881 ' 1.26 <1 222 2.1 S1 <0.2 144 6.95 AB-43SS Shallow <1 2.1 <1 <50 <1 0.26 8.98 3.3 485 9 1360 2.84 9.27 <1 420 24 <0.2 208 2.85 AB-44D Deep <1 <1 <1 38 ' <1 0.88 2.26 0.4 ' 479 2.384 ' 191 1.25 0.828 ' <1 219 34 <0.2 153 5.67 AB-44SS Shallow <1 <1 <1 1,190 <1 <0.025 0.37 ' 12.9 306 2.026 j 4,800 0.272 ' 6.86 <1 410 370 <0.2 577 0.764 CCR-01DA Deep < 0.5 0.19 < 0.1 6 < 0.08 0.6125 0.8 1.8 1.2 < 0.5 1 < 0.1 125 CCR-01S Shallow 0.19 < 0.1 0.062 13 < 0.08 1.1 5 1 0.2 < 0.5 2.8 < 0.1 30 CCR-02D Deep < 0.5 0.29 < 0.1 72 < 0.08 < 0.5 0.5 46.8 1.0 < 0.5 13.5 < 0.1 293 CCR-02S Shallow 0.66 0.13 0.049 4 < 0.08 3.5 0.8 1.5 0.7 < 0.5 0.7 < 0.1 31 CCR-03DA Deep 0.27 0.85 < 0.1 12 < 0.08 1.1 0.2 21.6 6.1 < 0.5 10.4 < 0.1 250 CCR-03S Shallow < 0.5 0.32 0.13 463 0.27 2.4 46.4 1.5 < 0.5 0.92 0.11 231 CCR-04DA Dee < 0.5 1.1 < 0.1 40 < 0.08 0.71 0.3 24.7 0.56 < 0.5 < 0.1 431 CCR-04SA Shallow < 0.5 77.6 21.9 296 4.7 1.8 2,100 44.2 < 0.5 45.5 0 0.80 1,913 CCR-05D Dee < 0.5 0.27 < 0.1 38 < 0.08 < 0.5 0.2 1.8 0.9 < 0.5 < 0.1 193 CCR-05S Shallow < 0.5 4.7 7.8 638 6.7 0.56 633 180.5 < 0.5 8.5 6 US 2.2 1,275 CCR-06D Dee < 0.5 0.13 < 0.1 25 < 0.08 < 0.5 0.1 2.9 0.86 < 0.5 < 0.1 125 CCR-06S Shallow < 0.5 5.4 1.6 620 < 0.08 1.2 38.2 22.7 < 0.5 4.1 3.6 4,060 CCR-07D Dee < 0.5 0.12 < 0.1 733 < 0.08 1.1 0.3 1.3 0.54 < 0.5 1 < 0.1 223 CCR-07S Shallow < 0.5 0.3 0.13 1 805 0.087 0.91 6.2 1.7 < 0.5 < 0.5 1 < 0.1 455 CCR-08D Deep < 0.5 0.14 < 0.1 1,355 < 0.08 0.55 0.2 4.2 0.22 < 0.5 95.8 < 0.1 219 CCR-08S Shallow < 0.5 0.49 0.1 1,595 0.12 0.51 46.4 0.7 < 0.5 0.79 253 0.12 419 CCR-09D Deep < 0.5 < 0.1 < 0.1 1,863 < 0.08 < 0.5 0.2 2.1 2.5 < 0.5 134 < 0.1 264 CCR-09S Shallow < 0.5 0.2 < 0.1 1,355 < 0.08 < 0.5 19.3 < 2.5 < 0.5 < 0.5 191 0.12 321 CCR-11DA Deep < 0.5 < 0.1 < 0.1 1,390 < 0.08 0.68 0.1 1.2 0.76 0.36 81.4 < 0.1 182 CCR-11S Shallow < 0.5 0.086 < 0.1 178 < 0.08 1.2 0.1 1 10.9 1.8 83.8 < 0.1 278 CCR-14D Deep < 0.5 0.27 < 0.1 576 < 0.08 2 0.4 1.7 1.8 < 0.5 43.2 < 0.1 178 CCR-14S Shallow < 0.5 0.079 < 0.1 680 < 0.08 < 0.5 9.1 1 < 0.5 0.55 34.7 < 0.1 109 CCR-16BR Bedrock < 0.5 0.12 < 0.1 479 < 0.08 0.28 0.57 < 0.1 88 < 2.5 < 5 0.32 1.4 < 0.5 264 37.6 < 0.1 164 8.1 CCR-16D Bedrock < 0.5 0.35 < 0.1 604 < 0.08 < 0.5 0.1 36.7 0.78 < 0.5 38.8 < 0.1 184 CCR-16S Shallow < 0.5 0.27 0.058 1,720 0.080 0.68 2 0.9 < 0.5 < 0.5 125 0.077 286 CCR-17D Bedrock < 0.5 0.24 < 0.1 1,520 < 0.08 < 0.5 0.1 1.6 0.43 < 0.5 47.8 < 0.1 302 CCR-17S Shallow < 0.5 0.083 < 0.1 1,398 < 0.08 1.7 0.8 0.5 < 0.5 < 0.5 43.8 0.13 202 CCR-18D Deep < 0.5 0.16 < 0.1 286 < 0.08 < 0.5 0.2 1.3 0.73 < 0.5 47.3 < 0.1 258 CCR-18S Shallow < 0.5 0.26 0.61 24 < 0.08 1.6 24 1.9 < 0.5 0.6 69.8 < 0.1 129 CCR-20D Deep < 0.5 0.11 < 0.1 508 < 0.08 0.56 0.5 0.9 0.42 0.68 44 < 0.1 261 CCR-20S Shallow < 0.5 0.11 0.46 185 < 0.08 2 12.1 2.9 < 0.5 0.49 15 < 0.1 122 CCR-21D Deep < 0.5 0.1 < 0.1 401 < 0.08 < 0.5 0.1 9.5 0.58 < 0.5 44.5 < 0.1 308 CCR-21S Shallow < 0.5 0.11 2 1,618 0.73 0.67 48.6 7.6 < 0.5 0.29 22.9 0.21 179 CCR-22DA Deep 1.5 0.46 < 0.1 17 < 0.08 3 0.1 11.7 9.3 < 0.5 27.9 < 0.1 188 CCR-22S Shallow < 0.5 < 0.1 0.24 4 < 0.08 0.91 4.6 2.8 < 0.5 < 0.5 3.3 0.063 74 CCR-23D Deep < 0.5 0.12 < 0.1 5 < 0.08 0.67 0.6 1.3 0.89 < 0.5 2.3 < 0.1 136 CCR-23S Shallow < 0.5 < 0.1 0.062 3 < 0.08 < 0.5 0.8 0.5 < 0.5 < 0.5 < 1 < 0.1 61 GWA-06BRA Bedrock 0.91 0.2 < 0.1 < 50 < 0.08 0.056 3 3.7 253 16.9 220 1.4 3 < 0.5 714 130 < 0.1 378 6.7 GWA-06BRL Bedrock 0.15 4.2 < 0.1 75 < 0.08 0.034 1.1 0.4 401 4 67 17.3 1.4 < 0.5 376 71.8 < 0.1 264 0.74 GWA-06DA Deep 0.66 0.84 < 0.1 29 < 0.08 0.026 2.3 0.5 936 12.9 761 0.9 2.3 < 0.5 998 341 < 0.1 870 0.95 GWA-06S Shallow < 0.5 121 35.1 281 6.9 1 5.1 8.6 3,072 2,720 36.4 131,200 < 0.5 660 84.1 1,436 1,380 0.61 2,225 0.73 GWA-27D Deep <1 <1 <1 29 ' <1 <0.025 2.33 2.1 942 <5 351 3.34 3.9 0.344 j 1,040 260 <0.2 530 3.2 GWA-27S Shallow <1 <1 0.384 ' 143 1.34 0.3 P4 RO 4.09 785 217 1.982 ' 45,200 0.155 ' 151 <1 304 270 <0.2 478 0.307 GWA-30D Dee <1 <1 <1 207 <1 0.038 0.388 ' 4.94 652 4.823 1 300 0.434 ' 10.6 <1 1,690 640 <0.2 289 1.26 GWA-30S Shallow <1 0.438 ' <1 361 0.909 ' <O.025 P4 RO 0.704 ' 67.2 67 <5 23,700 0.091 ' 24.6 1 <1 221 980 <0.2 254 1.16 At or Beyond the Compliance Boundary Locations - Upgradient of the Ash Basin AB-04BR Bedrock < 0.5 0.21 < 0.1 < 50 0.14 1.5 1.5 1.2 < 50 4 213 2.3 1.5 < 0.5 266 4.8 < 0.1 217 3.4 AB-04D Deep < 0.5 0.075 < 0.1 < 50 < 0.08 5.4 6.3 0.1 103 < 2.5 7 < 0.5 2.7 < 0.5 184 1.9 < 0.1 103 4.5 AB-04S Shallow < 0.5 0.14 < 0.1 < 50 < 0.08 0.1 < 0.5 0.2 622 0.51 38 < 0.5 0.59 < 0.5 51 9.4 < 0.1 93 1.1 AB-13D Deep < 0.5 0.13 < 0.1 < 50 < 0.08 0.86 1.3 0.1 129 < 2.5 8 0.72 0.81 < 0.5 190 < 1 < 0.1 122 5.9 AB-13S Shallow < 0.5 < 0.1 < 0.1 < 50 < 0.08 0.45 0.81 0.8 57 < 2.5 66 < 0.5 2.7 < 0.5 67 1.6 < 0.1 85 0.76 AB-14BR Bedrock < 0.5 1.1 < 0.1 < 50 < 0.08 0.17 < 0.5 < 0.1 < 50 1.7 < 5 7.7 < 0.5 < 0.5 149 5 < 0.1 134 15.3 AB-14D Deep < 0.5 < 0.1 0.12 158 < 0.08 2.7 0.9 125 < 2.5 12 < 0.5 5.7 < 0.5 66 27.5 < 0.1 110 0.65 GWA-09BR Bedrock 0.8 0.44 < 0.1 < 50 0.096 0.22 0.51 0.1 79 4.5 19 8.1 0.61 < 0.5 117 11.5 < 0.1 131 9.8 GWA-09D Dee < 0.5 0.2 < 0.1 < 50 < 0.08 0.62 1.0 0.1 164 < 2.5 9 0.89 0.48 < 0.5 112 2.3 < 0.1 97 5.9 GWA-095 Shallow < 0.5 0.21 0.11 < 50 < 0.08 0.641 0.61 7.1 156 < 2.5 324 < 0.5 2.9 < 0.5 78 16.3 < 0.1 104 0.42 GWA-14DA I Deep 1 1.4 1 0.73 1 < 0.1 1 < 50 1 < 0.08 1 0.997 1 1.2 1 0.1 1 < 50 1 25.3 1 < 5 0.43 1 < 0.5 1 206 1 5.2 1 < 0.1 1 135 1 13.2 < < < 2.5 1 23 < 0.5 1 1.6 1 < 0.5 1 4 1 < I I < 0.1 1 47 1 < 0.3 Page 2 of 4 TABLE 6-5 MEANS OF GROUNDWATER COIs - JANUARY 2018 TO JUNE 2019 AND OCTOBER 2019 CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY, CAROLINAS, LLC, BELMONT, NC Analytical Parameters Antimony Arsenic Beryllium Boron Cadmium Chromium (VI) Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Total Dissolved Solids Vanadium Reporting Units L L L L L L L L L L L L L L L m L L m L L 15A NCAC 02L Standard 1* 10 4* 700 2 NE 10 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* 2018 Background Threshold Values Shallow Flow Zone 0.76 0.59 0.12 50 1 2.2 6.8 1.5 884 NE 225 0.844 5.8 0.5 298 1.5 0.1 163 5.7 2019 Background Threshold Values Shallow Flow Zone 1 0.71 0.13 50 0.08 2.3 9.1 5.7 1 422 3 608 6.7 8.9 0.5 300 5.4 0.1 154 3.9 2019 Background Dataset Range Shallow Flow Zone 0.084 - <1 0.048 - 2.3 0.01 S1 - 0.22 4.4 - <50 0.028 <0.08 0.013 j - 3.2 0.11 j - 37.6 0.0381- 19.2 29 j - 2940 0.16 - 3.6 2.8 1 - 1620 0.09 j - 10.7 0.14 j - 26.2 0.32 - <0.5 2.6 1 - 309 <0.1 - 10.7 0.017 j - <0.2 15 - < 250 0.088 j - 7.5 2018 Background Threshold Values (Deep Flow Zone 1 1 0.03 50 1 1.3 6.8 1 356 NE 26.2 1.8 5 0.62 232 5.4 0.1 158 11.5 2019 Background Threshold Values (Deep Flow Zone 0.69 1.1 1 50 1 1.5 16.1 0.82 665 25.3 256 26.2 10.3 0.75 240 14.5 0.1 173 16.1 2019 Background Dataset Range Dee Flow Zone 0.096 j - 0.85 0.048 j - 1.4 0.01 j - <1 5.8 - 50.3 0.039 - <1 0.015 - 1.8 0.23 B S1 - 93.2 0.019 - 4.6 27.5 B - 823 0.89 - 44.9 2.7 - 900 0.21 - 30.2 0.16 - 52.6 0.34 - 1.2 31 - 251 0.5 - 22 0.016 - <0.1 43 - 280 1.2 - 17.9 2018 Background Threshold Values Bedrock Flow Zone 0.5 1.6 0.1 50 0.08 0.23 5.6 0.3 284 NE 278 8.9 3.4 0.5 154 2.9 0.1 165 15.9 2019 Background Threshold Values Bedrock Flow Zone 2.6 1.6 0.1 50 0.08 0.77 10.2 0.35 1,242 26.3 360 11 6.9 0.5 181 7.3 0.1 221 12.5 2019 Background Dataset Range Bedrock Flow Zone 0.27 - 3.9 0.24- 1.6 0.01 - < 0.1 35.6 j - <50 <0.08 <0.025 - 0.66 0.33 j - 8.9 0.021 j - 0.311 40.7 i - 715 0.9 i - 26.3 2.8 - 278 1.7 - 10.5 0.22 j - 5.8 0.17 i - < 0.5 97.7 - 223 1.8 - 33.3 0.02 i - < 0.1 104 - 222 7.5 - 15.9 Sample ID Flow Zone Means Results At or Beyond the Compliance Boundary Locations - Upgradient of the Ash Basin (Continued) GWA-15D Deep < 0.5 0.15 < 0.1 < 50 0.12 1 1.4 < 0.1 < 50 2.0 4 0.13 0.91 < 0.5 246 3.5 < 0.1 155 5.0 GWA-15S Shallow < 0.5 0.14 < 0.1 71 < 0.08 0.99 1.2 0.1 229 < 2.5 25 < 0.5 2.4 < 0.5 169 11.1 < 0.1 107 4.4 GWA-22D Deep 0.17 0.17 < 0.1 < 50 < 0.08 0.79 2.7 0.3 317 1.7 18 0.49 3.7 < 0.5 291 1.2 < 0.1 186 12 GWA-22S Shallow < 0.5 0.086 0.1 < 50 0.13 0.1 0.56 15.1 246 < 2.5 521 < 0.5 2.1 < 0.5 6 1.4 < 0.1 < 25 0.25 GWA-24BR Bedrock < 0.5 0.65 < 0.1 < 50 < 0.08 0.17 0.85 0.3 700 4.5 32 3.4 1.1 < 0.5 110 10.1 < 0.1 131 9.5 GWA-24D Deep < 0.5 0.23 < 0.1 < 50 < 0.08 1.2 1.3 0.1 244 < 2.5 7.2 0.31 0.4 < 0.5 92 2.8 < 0.1 112 11.1 GWA-24SA Shallow < 0.5 < 0.1 < 0.1 < 50 < 0.08 0.25 1.7 0.4 198 < 2.5 66 < 0.5 3.6 < 0.5 10 < 1 < 0.1 38 0.41 At or Beyond the Compliance Boundary Locations - Downgradient of the Ash Basin AB-06A Shallow < 0.5 0.13 < 0.1 < 50 < 0.08 AL 10.5 0.1 52 0.54 12 < 0.5 1.1 0.42 227 30.4 < 0.1 135 3.7 AB-06R Shallow < 0.5 0.15 < 0.1 < 50 < 0.08 7.2 0.1 100 < 2.5 38 < 0.5 1.8 0.35 212 29.7 < 0.1 131 3.4 AB-09D Deep < 0.5 0.087 < 0.1 551 < 0.08 0.3 < 0.5 < 0.1 76 < 2.5 11 0.18 < 0.5 1.7 330 49.1 < 0.1 197 6.5 AB-09S Shallow < 0.5 0.11 < 0.1 722 < 0.08 < 0.025 < 0.5 8,062 < 0.5 30 O50 < 0.5 0.89 < 0.5 147 33.9 < 0.1 131 < 0.3 AB-10BR Bedrock < 0.5 0.19 < 0.1 554 < 0.08 0.065 1.6 0.3 504 < 2.5 35 0.8 1.9 < 0.5 527 46.8 < 0.1 271 7.8 AB-10BRL Bedrock < 0.5 8.3 < 0.1 420 < 0.08 0.047 0.94 0.1 333 3.9 70 8.9 1.3 < 0.5 565 165 < 0.1 551 0.47 AB-10D Deep < 0.5 0.083 < 0.1 < 50 < 0.08 2.8 2.8 0.1 57 < 2.5 < 5 < 0.5 0.58 < 0.5 209 28.3 < 0.1 147 4.6 AB-10S Shallow < 0.5 < 0.1 < 0.1 < 50 < 0.08 0.037 < 0.5 1.9 96 < 0.5 772 < 0.5 0.88 < 0.5 220 19.4 < 0.1 124 0.54 AB-11D Deep < 0.5 < 0.1 < 0.1 < 50 < 0.08 3.2 3.4 < 0.1 87 < 0.5 < 5 < 0.5 < 0.5 < 0.5 123 < 1 < 0.1 98 1.8 CCR-26BR Bedrock < 0.5 0.22 < 0.1 < 50 < 0.08 1.9 1.8 0.1 62 3.8 6 0.61 0.79 1.2 629 149 < 0.1 377 4.1 CCR-26D Deep < 0.5 0.13 < 0.1 < 50 < 0.08 2 2.1 < 0.1 176 2.1 19 0.28 0.71 0.66 320 56.4 < 0.1 197 4.3 CCR-26S Shallow < 0.5 1.9 < 0.1 < 50 < 0.08 < 0.025 0.62 11.2 45 575 < 2.5 1 100 0.17 1.1 < 0.5 98 2.2 < 0.1 80 0.29 CP-01D Deep 1.4 0.18 < 0.1 76 < 0.08 0.14 3.6 2.4 < 50 4.6 30,133 < 0.5 1.8 0.91 1,510 657 < 0.1 1,074 1.1 CP-01S Shallow < 0.5 0.48 < 0.1 < 50 < 0.08 < 0.025 0.7 51.4 32,733 < 2.5 5 133 0.16 0.63 < 0.5 341 342 0.18 563 < 0.3 CP-02D Deep < 0.5 0.28 < 0.1 24 0.080 < 0.025 0.73 2.2 75 3.6 1,673 0.4 34.7 < 0.5 3,697 2,152 < 0.1 3,318 2.9 CP-02S Shallow < 0.5 0.79 < 0.1 < 50 0.10 < 0.025 0.9 10.4 3,243 < 2.5 2,960 0.36 13.7 < 0.5 3,100 1,746 < 0.1 2 656 0.37 CP-03D Deep < 0.5 0.55 < 0.1 < 50 < 0.08 < 0.025 0.52 8 3,190 3.8 3,223 1.5 2.8 < 0.5 1,330 540 < 0.1 929 0.42 CP-03S Shallow 0.28 0.97 0.24 < 50 0.35 < 0.025 1.1 49.4 1,061 4.8 3,090 < 0.5 5.1 2.3 901 928 0.076 1.434 0.39 CP-04D Deep < 0.5 0.26 < 0.1 478 < 0.08 < 0.025 < 0.5 0.3 431 4.7 418 0.51 1.9 < 0.5 584 24 < 0.1 291 3.9 CP-04S Shallow < 0.5 0.11 < 0.1 32 < 0.08 < 0.025 < 0.5 18.8 5,970 < 2.5 3,400 < 0.5 0.34 < 0.5 109 65.2 0.12 133 < 0.3 CP-05D Deep < 0.5 0.18 < 0.1 709 < 0.08 0.036 < 0.5 1.4 474 4.8 459 0.59 1.6 < 0.5 868 253 < 0.1 491 1.1 CP-05S Shallow < 0.5 0.19 < 0.1 < 50 < 0.08 < 0.025 0.86 36.1 4,544 < 2.5 5,523 < 0.5 1.8 < 0.5 45.6 18.9 0.11 138 0.34 CP-06BR Bedrock 0.18 4.7 < 0.1 47 < 0.08 0.042 < 0.5 < 0.1 < 50 4.8 14 6.6 0.4 < 0.5 194 50 < 0.1 267 0.30 CP-06D Deep < 0.5 0.24 < 0.1 1,488 < 0.08 0.041 1.4 1 562 2.7 280 1.3 0.5 < 0.5 456 122 < 0.1 266 0.78 CP-06S Shallow < 0.5 0.29 < 0.1 1,354 < 0.08 0.029 < 0.5 12.9 4.517 2.5 2,790 < 0.5 0.42 < 0.5 341 185 < 0.1 323 < 0.3 GWA-01BR Bedrock < 0.5 0.84 < 0.1 < 50 < 0.08 0.086 0.55 0.2 < 50 10.8 33 1.7 < 0.5 < 0.5 244 15 < 0.1 175 6.3 GWA-01D Deep < 0.5 0.19 < 0.1 52 < 0.08 6.5 6.6 < 0.1 70 6.1 7 0.26 0.64 < 0.5 288 11.6 < 0.1 177 5.9 GWA-01S Shallow < 0.5 < 0.1 0.12 < 50 < 0.08 0.83 2.9 3.4 86 < 2.5 13 < 0.5 1.7 < 0.5 11 < 1 0.043 75 < 0.3 GWA-02D Deep < 0.5 0.14 < 0.1 < 50 < 0.08 2.6 E 2.8 < 0.1 126 3.4 5 0.19 < 0.5 < 0.5 132 1.6 < 0.1 106 4.3 GWA-02S Shallow < 0.5 < 0.1 0.092 < 50 < 0.08 0.058 < 0.5 6.8 85 < 2.5 150 < 0.5 0.96 < 0.5 29 < 1 < 0.1 40 < 0.3 GWA-03BRA Bedrock 1.4 1.9 < 0.1 85 < 0.08 0.037 1.1 0.1 < 50 41.5 < 5 2.4 1.6 < 0.5 111 17.8 < 0.1 149 0.66 GWA-03BRL Bedrock < 0.5 1.4 < 0.1 < 50 < 0.08 0.036 < 0.5 < 0.1 < 50 < 2.5 5 3.1 < 0.5 0.55 129 6.1 < 0.1 128 5.2 GWA-03D Deep < 0.5 0.3 < 0.1 117 < 0.08 0.31 0.86 0.3 133 6.2 13 1 0.46 < 0.5 133 10.9 < 0.1 129 8.4 GWA-03S Shallow < 0.5 0.13 < 0.1 338 < 0.08 < 0.025 0.84 11.5 7A92 0.66 2,130 1 < 0.5 0.76 < 0.5 96 41.4 < 0.1 129 < 0.3 GWA-04BR Bedrock 0.54 0.33 < 0.1 380 < 0.08 0.038 < 0.5 < 0.1 62 2.2 53 1 2.8 < 0.5 0.52 130 41.4 < 0.1 179 1.2 GWA-04BRL Bedrock 0.12 3.4 < 0.1 206 < 0.08 0.14 3.2 0.1 128 15.6 38 1 26.5 1 2.4 0.92 375 261 < 0.1 1,146 4.8 GWA-04D Deep < 0.5 0.092 < 0.1 679 < 0.08 0.03 < 0.5 < 0.1 70 < 2.5 14 0.36 < 0.5 1.3 243 68.3 < 0.1 170 4.5 GWA-04S Shallow < 0.5 0.13 < 0.1 2,027 < 0.08 0.029 0.67 4.3 505 0.51 1 533 < 0.5 0.54 < 0.5 372 147 0.062 272 < 0.3 GWA-05BRA Bedrock < 0.5 0.88 < 0.1 736 < 0.08 0.038 0.62 0.1 134 2 87 3.1 0.92 < 0.5 220 56.7 < 0.1 195 0.75 GWA-05BRL Bedrock 0.29 5.4 < 0.1 43 < 0.08 0.036 < 0.5 0.1 111 1.3 24 8.5 1.5 < 0.5 202 55.4 < 0.1 208 1.2 GWA-05D Bedrock < 0.5 0.31 < 0.1 656 < 0.08 0.095 0.58 0.3 242 6.4 147 0.75 0.69 < 0.5 225 37.6 < 0.1 171 4.7 GWA-05S Shallow < 0.5 0.26 < 0.1 < 50 0.3 0.052 0.58 21.3 1,250 < 2.5 5,804 < 0.5 3.2 0.51 44j480 0.12 116 0.43 GWA-07D Dee < 0.5 0.11 < 0.1 < 50 < 0.08 6.6 6.6 < 0.1 88 1.2 5 0.14 0.64 2.8 582 < 0.1 304 4.3 GWA-07S Shallow < 0.5 1.6 1.0 < 50 0.24 6.5 6.6 65.5 148 4.3 334 < 0.5 9.7 3.7 18 0.11 170 < 0.3 GWA-28BR Bedrock <1 0.551 j <1 21 ' <1 <0.025 M1 <1 <1 53 2.979 1 89 5.13 <1 <1 853 <0.2 794 3.06 GWA-28D Dee <1 <1 <1 <50 <1 <0.025 2.16 10.1 734 6 3 270 2.2 2.56 0.528 ' 1 980 <0.2 1 480 1.2 GWA-28S Shallow <1 <1 0.63 ' <50 <1 <0.025 0.496 ' 22.4 386 <5 4 800 0.092 ' 2.46 0.436 ' 120 00.126 ' 1 520 0.954 GWA-29BR Bedrock <1 0.454 ' <1 <50 <1 <0.025 0.75 ' 1.9 1000 2.916 ' 449 3.26 2.11 <1 2 8400<0.2 1 870 2.39 GWA-29D Dee <1 <1 <1 <50 <1 <0.025 0.541 ' 4.1 367 <5 610 1.97 16.9 0.423 ' 2 090 <0.2 1 170 2.05 GWA-29S Shallow <1 0.338 ' <1 <50 <1 <0.025 <1 9.1 400 <5 2 210 0.293 ' 3.74 <1 504 0 <0.2 384 0.417 At or Beyond the Compliance Boundary Locations - Sidegradient of the Ash Basin AB-01R Shallow < 0.5 1 0.1 < 0.1 < 50 < 0.08 4.3 0.1 97 0.97 7 0.15 1.4 0.9 363 114 < 0.1 258 2.2 AB-02 Shallow < 0.5 < 0.1 0.1 < 50 < 0.08 0.31 0.43 0.8 96 0.71 34 < 0.5 1.2 < 0.5 4 1.1 < 0.1 30 < 0.3 AB-02D AB-05 Deep Shallow < 0.5 < 0.5 0.1 < 0.1 < 0.1 < 0.1 < 50 < 50 < 0.08 < 0.08 1.4 2.5 4.6 < 0.1 0.1 73 512 0.59 0.6 < 5 15 < 0.5 < 0.5 0.89 2.9 < 0.5 < 0.5 87 17 < 1 < 0.1 69 4.3 1 < 0.1 29 1.1 GWA-08D Deep < 0.5 0.1 < 0.1 < 50 1 < 0.08 0.60 1 1.2 0.2 177 1.5 6 0.49 1.3 < 0.5 268 1.1 < 0.1 128 7 GWA-08S Shallow < 0 5 < n 1 < n I < < < < < Page 3 of 4 TABLE 6-5 MEANS OF GROUNDWATER COIs - JANUARY 2018 TO JUNE 2019 AND OCTOBER 2019 CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY, CAROLINAS, LLC, BELMONT, NC Analytical Parameters Antimony Arsenic Beryllium Boron Cadmium Chromium (VI) Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Total Dissolved Solids Vanadium Reporting Units L L L L L L L L L L L L L L L m L L In L L 15A NCAC 02L Standard 1* 10 4* 700 2 NE 10 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* 2018 Background Threshold Values Shallow Flow Zone 0.76 0.59 0.12 50 1 2.2 6.8 1.5 884 NE 225 0.844 5.8 0.5 298 1.5 0.1 163 5.7 2019 Background Threshold Values Shallow Flow Zone 1 0.71 0.13 50 0.08 2.3 9.1 5.7 1 422 3 608 6.7 8.9 0.5 300 5.4 0.1 154 3.9 2019 Background Dataset Range Shallow Flow Zone 0.084 - <1 0.048 - 2.3 0.01 S1 - 0.22 4.4 - <50 0.028 <0.08 0.013 i - 3.2 0.11 i - 37.6 0.038 - 19.2 29 i - 2940 0.16 - 3.6 2.8 1 - 1620 0.09 J - 10.7 0.14 i - 26.2 0.32 - <0.5 2.6 1 - 309 <0.1 - 10.7 0.017 J - <0.2 15 - <250 0.088 i - 7.5 2018 Background Threshold Values (Deep Flow Zone 1 1 0.03 50 1 1.3 6.8 1 356 NE 26.2 1.8 5 0.62 232 5.4 0.1 158 11.5 2019 Background Threshold Values (Deep Flow Zone 0.69 1.1 1 50 1 1.5 16.1 0.82 665 25.3 256 26.2 10.3 0.75 240 14.5 0.1 173 16.1 2019 Background Dataset Range (DeeD Flow Zone 0.096 i - 0.85 0.048 i - 1.4 0.01 j - <1 5.8 - 50.3 0.039 - <1 0.015 - 1.8 0.23 B S1 - 93.2 0.019 - 4.6 27.5 B - 823 0.89 - 44.9 2.7 - 900 0.21 - 30.2 0.16 - 52.6 0.34 - 1.2 31 - 251 0.5 - 22 0.016 - <0.1 43 - 280 1.2 - 17.9 2018 Background Threshold Values Bedrock Flow Zone 0.5 1.6 0.1 50 0.08 0.23 5.6 0.3 284 NE 278 8.9 3.4 0.5 154 2.9 0.1 165 15.9 2019 Background Threshold Values Bedrock Flow Zone 2.6 1.6 0.1 50 0.08 0.77 10.2 0.35 1,242 26.3 360 11 6.9 0.5 181 7.3 0.1 221 12.5 2019 Background Dataset Range Bedrock Flow Zone 0.27 - 3.9 0.24 - 1.6 0.01 - <0.1 35.6 j - <50 <0.08 <0.025 - 0.66 0.33 j - 8.9 0.021 j - 0.311 40.7 i - 715 0.9 i - 26.3 2.8 - 278 1.7 - 10.5 0.22 i - 5.8 0.17 i - <0.5 97.7 - 223 1.8 - 33.3 0.02 i - <0.1 104 - 222 7.5 - 15.9 Sample ID Flow Zone Means Results At or Beyond the Compliance Boundary Locations - Sidegradient of the Ash Basin (Continued) GWA-17D GWA-17S Dee Shallow < 0.5 < 0.5 0.2 0.2 < 0.1 < 0.1 < 50 < 50 < 0.08 < 0.08 0.31 1.6 6.4 1.1 0.1 148 2 0.69 10 0.82 0.35 1.1 1.7 < 0.5 < 0.5 256 131 3.3 4.7 < 0.1 < 0.1 122 79 5.2 2 GWA-18D Dee < 0.5 0.4 < 0.1 < SO < 0.08 0.88 1.4 0.1 67 4.0 9 0.64 1.1 < 0.5 166 2.6 < 0.1 113 8 < 0.5 1 0.5 1 < 0.1 1 < 50 1 < < 0.5 1 188 1 < I I < Notes: ' - Background threshold values were calculated using data from background groundwater samples collected June 2015 to September 2017. 2 - Background threshold values and background dataset ranges were calculated using data from background groundwater samples collected March 2011 to December 2018. Statistical mean calculated from data ranging from January 2018 to June 2019. Ash pore water results are not compared to groundwater standards or criteria. For wells with datasets containing fewer than four valid results, the most recent valid sample data was used. Means were calculated for wells with four or more valid sample results. Sample results were excluded from calculations: 1) if turbidity >10 NTU (for CCIs other than boron) 2) for unusable data (RO qualified) 3) if a result was non -detect at a reporting limit (RL) greater than the normal laboratory RL 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 greatest background threshold value where there is no regulatory standard, or background threshold values are greater than regulatory standard 0 - highlighted concentration indicates value is either within range of background threshold values for constituents where there is no regulatory standard/background threshold values are greater than regulatory standard, or within range of background threshold value and the 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. - - no available data to conduct mean analysis NE - not established mg/L - milligrams per liter pg/L - micrograms per liter Prepared by: LWD Checked by: JYT / DAA Revised by: EMY / LWD Page 4 of 4 TABLE 6-6 COI MANAGEMENT MATRIX CORRECTIVE ACTION PLAN UPDATE AL EN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Constituent Standards and Values - 02L Criterion Rationale - 02L Criterion AJIN©©©� - --lik. di.oributi- lik.1y,.I.t.d No nneansio,—d! c—"ntiv. miter. MEN�©o�®®®�o ©000©® MEN�©®��®o ©oo©o ...... pilaw, . E .... d,nc,, depict, pl—a-like distro,t- likely related to the coal pil—ma. Constituent Standards and Values - IMAC Criterion 3ME Rati nale - IMAC Criterion Rati N..e.ns a.ceed Site specific background —1 U. MEN��o AIN000� .• !background MENN.nna— AIN 0 a.caed c—p—tive cdoeria N.nna— a.caed cs.p.rative cdoere MEN�m®®®®��o 0000©® MENthe d0000® �om�®®®®o NNI mti,ed ash basin ®®®® ®®MEN®EMIEW ®®®® ®®® �� __ - - - - - - o - 0 uwi •me.o�a�•,a•m� TABLE 6-7 SUMMARY TREND ANALYSIS RESULTS FOR MONITORING WELLS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Wells Within the Waste Boundary Wells Within the Waste Boundary Wells Between Waste Boundary and Compliance Boundary Well ID Boron Sulfate Total Dissolved Solids Well ID Boron Sulfate Total Dissolved Solids WeII ID Boron Sulfate Total Dissolved Solids Ash Pore Water Wells Deep Flow Zone Shallow Flow Zone AB-20S AB-21S D S D D D NT AB-20D AB-21D ND D ND NE NE CCR-015 CCR-02S NE NE NE ND D S AB-2 15L AB-22S ND S D S NT AB-22D AB-23BRU S S NE NE ND NE NE S NE NE S CCR-035 S D S CCR-04SA CCR-05S CCR-06S S S S S AB-23S AB-24S AB-24SL D S S S AB-24D AB-25BRU Ali CCR-07S S I I AB-25S AB-25SL AB-265 AB-27S D D S S D D S D D S AB-27D AB-28D AB-29D AB-30D S D D S S ND S NE NE S I CCR-08S S I I CCR-09S CCR-20S CCR-21S CCR-22S CCR-23S S I I I D D ND D ND D NT S S S S S D S D AB-31D AB-32D SL S D D AB-33D S NT S GWA-06S ND D D S 1S t N S NT S AB-34D AB-35D ND D ND NE NE GWA-18S ND D S Dee Flow Zone 2S ND 5 5 AB-36D ND D S CCR-01DA4DNT S S I D D AB-37D ND D S CCR-02D D 5 AB-35S AB-365 I I NT NT D D I D 5 AB-38D AB-39D Bedrock Flow ND S S Zone CCR-03DA S CCR-04DA CCR-OSD S S AB-375 AB-38S AB-39S ND S S D T S S AB-21 BR AB-21BRL AB-22BR AB-22BRL ND 5 S S NE NE S NT S CCR-06D CCR-07DS S S S S CCR-08DShallow CCR-09D Flow Zone AB-21SS ND D D AB-24BR ND NT S CCR-20D S AB-25SS AB-29SS S S S S AB-25BR AB-27BR ND S NE NT NE CCR-ER CCR-22DA S S NT S S AB-33SS S S S AB-35BR ND D D AB-35PWS NE NE NE AB-38BR ND S S AB-38SS ND NT S CCR-23D ND 5 5 GWA-06DA GWA-18D D I ND NT S Bedrock Flow Zone GWA-06BRA ND S S GWA-06BRL NE NE NE txgsss: 1. Summary of results antl [rentls are presented for samples mlleRetl from 2009 2. Trend results are presented when at least four samples were available and frequency of detection was >50%. Stadifti y significant trends are reported at the 95% confidence level. 3. Vanablllty Index (VI) is calculated as the (maximum - minimum) / medlan concentration and Is calculated using deteRed concentrations only. Values less than 1 Indicate low —lability In the da[ase[. = Greater than 50 percent of mns[i[uen[ concentrations were non -detect D = Statistically significant, decreasing wncentriid.. trend 5 = Stable. No significant trentl antl variability is low (VI< 1) NT = No significant trend and varlabllity Is high (VI > 1) = Statistcally sign ifii nt, increasing concentration trend. = Insufficient number of samples to evaluate trentl (n < 4) Wells Near or Beyond Compliance Boundary Well ID Boron Sulfate Total Dissolved Solids Shallow Flow Zone AB-01R AB-02 ND ND NT I ND AB-06A AB-06R ND ND I I I I AB-09S S 5 S AB-10S CCR-11S ND I D S CCR-14S D D D CCR-i6S CCR-17S I I S S CCR-18S D S D CCR-26S ND NT S CP-01S ND 5 D CP-02S ND S S CP-03S ND S D CP-04S NE NE NE CP-05S NE NE NE CP-06S S S S GWA-01S ND ND I GWA-02S ND D NT GWA-03S GWA-04S GWA-OSS S S ND D S NT NT GWA-07S ND S S GWA-08S ND NT D Deep Flow Zone AB-02D AB-09D ND D D I S AB-10D AB-11D ND ND S S CCR-11DA S S S CCR-14D S S S CCR-18D CCR-26D D S ND S S Wells Near or Beyond Compliance Boundary Well ID Boron Sulfate Total Dissolved Solids Deep Flow Zone CP-01D S 5 5 CP-02D CP-03D T ND S S S D CP-04D NE NE NE CP-05D NE NE NE CP-06D GWA-01D S S S S GWA-02D ND D S GWA-03D S S S GWA-04D GWA-07D S ND S GWA-08D ND S S Bedrock Wells ABA0BR NE NE NE AB-10BRL NE NE NE CCR-16BR S D S CCR-16D CCRAM S S CCR-26BR ND S S CP-06BR GWA-01 BR NT ND NE NE S GWA-03BRA D S S GWA-03BRL NE NE NE GWA-04BR S S S GWA-04BRL I NE NE NE GWA-05BRA GWA-05RRI D I NE S NE �=NE GWA-OSD S S TABLE 6-8 SEEP CORRECTIVE ACTION STRATEGY CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Regulatory Approximate Average Seep ID General Location Present Flow Anticipated Seep Corrective Action Strategy Program (cfs) No additional corrective action, other than decanting, is anticipated because decanting has been an effective S-2 SOC Southeast of the AAB No flow corrective measure to reduce flow such that overland flow infiltrates prior to reaching the Catawba River (Lake Wylie). Basin closure and groundwater corrective action measures in the vicinity of S-2 would reduce the potential for flow to resume. No corrective action is necessary because S-03 is a permitted NPDES outfall (Toe Drain Outfall 103). S-3 NPDES East of AAB 0.01 Decanting has been effective in reducing flow. Further decanting, basin closure, and groundwater extraction Toe Drain Outfall 103 may cause flow to cease. If not, Duke may proactively impart corrective action measures such as capturing flow for management with extracted groundwater. No corrective action is necessary because S-04 is a permitted NPDES outfall (Toe Drain Outfall 104). S-4 NPDES East of AAB 0.01 Decanting has been effective in reducing flow. Further decanting, basin closure, and groundwater extraction Toe Drain Outfall 104 may cause flow to cease. If not, Duke may proactively impart corrective action measures such as capturing flow for management with extracted groundwater. Source control measures (i.e. decanting and ash basin closure) and groundwater corrective action measures (extraction wells) are anticipated to reduce potential for flow to continue. However, corrective action may not S-5 SOC East of AAB Insufficient for monitoring be necessary at this time because flow emerges below the ordinary high water mark. Duke Energy plans to continue to monitor this seep and if continued decanting is not effective in ceasing flow, then additional corrective measures would be considered, such as capturing flow for management with extracted groundwater Source control measures (i.e. decanting and ash basin closure) and groundwater corrective action measures (extraction wells) are anticipated to reduce potential for flow to continue. However, corrective action may not S-6 SOC East of AAB Insufficient for monitoring be necessary at this time because flow emerges below the ordinary high water mark. Duke Energy plans to continue to monitor this seep and if continued decanting is not effective in ceasing flow, then additional corrective measures would be considered, such as capturing flow for management with extracted groundwater Source control measures (i.e. decanting and ash basin closure) and groundwater corrective action measures (extraction wells) are anticipated to reduce potential for flow to continue. However, corrective action may not S-7 SOC East of AAB Insufficient for monitoring be necessary at this time because flow emerges below the ordinary high water mark. Duke Energy plans to continue to monitor this seep and if continued decanting is not effective in ceasing flow, then additional corrective measures would be considered, such as capturing flow for management with extracted groundwater No corrective action is necessary because S-8 is a permitted NPDES outfall. S-8 NPDES East of AAB No flow No additional corrective action, other than decanting, is anticipated because decanting has been an effective Toe Drain Outfall 108 corrective measure in ceasing flow. Further decanting, basin closure, and groundwater extraction would reduce the potential for flow to resume. No corrective action is necessary because S-8B is a permitted NPDES outfall. S-8B NPDES East of AAB No flow No additional corrective action, other than decanting, is anticipated because decanting has been an effective Toe Drain Outfall 108E corrective measure in ceasing flow. Further decanting, basin closure, and groundwater extraction would reduce the potential for flow to resume. S-10 SOC North of Primary Pond 1 of Insufficient for monitoring No additional corrective action, other than source control, is anticipated because decanting has reduced flow the AAB and ash basin closure would eliminate the seep. Notes: cfs- cubic feet per second NPDES - National Pollution Discharge Elimination System SOC - Special Order by Consent AAB - Active Ash Basin Prepared by: CIS Checked by: LWD Page 1 of 1 TABLE 6-9 WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Analytical Parameter Antimony Arsenic Beryllium Boron Cadmium C rommm VI Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Tota Dissolved Vanadium Impacted by Coal Ash? Comments Reporting Units uq/L uq/L uq/L uq/L uq/L uq/L uq/L I pa/L uq/L uq/L uq/L uq/L I uq/L uq/L uq/L mq/L uq/L mq/L uq/L 15A NCAC 02L Standard 1* 10 4* 700 2 NE 10 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* Background Threshold Values Bedrock Unit 0.5 1.6 0.1 50 0.08 0.23 5.6 0.3 284 NE 278 8.9 3.4 0.5 154 2.9 0.1 165 15.9 Background Threshold Values Bedrock Unit 2.6 1.6 0.1 50 0.08 0.765 10.19 0.3 1,242 26.3 360 11 6.944 0.5 181 7.3 0.1 221 12.5 Back round Data Set Range Bedrock UnitY 0.27 1 - 3.9 0.24 - 1.6 0.01 J - <0.1 35.6 1 - <50 <0.08 1 <0.025 - 0.66 0.33 J - 8.9 10.021 i - 0.31 40.7 i - 7151 0.9 i - 26.3 2.8 1 - 278 1.7- 10.5 10.22 i - 5.8 0.17 J - <0.5 97.7 - 223 1.8 - 33.3 0.02 i - <0.1 104 - 222 7.5 - 15.9 Sample ID Sample Collection Date Analytical Results ALl 02/10/2015 <1 <5 <1 <100 <0.1 <10 <1 <1 65 NA <5 <5 <5 <5 130 <1 <0.1 98 5 No All COIs are below comparative criteria ALl 08 03 2015 <0.5 <0.5 <0.2 <5 <0.08 0.17 <0.5 <0.5 <50 NA 1.1 0.63 <0.5 <0.5 124 <2 <0.1 100 6.3 AL100 03/17/2015 <3 <10 <1 <100 <1 <20 <10 <5 19.7 NA 1.54 <10 <10 <10 162 <10 <1 134 10 No All COIs are below comparative criteria AL100 AL-1000 05 12 2015 01/O1/2016 <0.5 <0.5 <0.5 0.53 <0.2 <0.1 <5 <25 <0.08 <0.08 0.2 0.71 <0.5 <0.5 <0.1 <50 <50 NA NA <0.5 1.3 0.89 0.91 <0.5 <0.5 <0.5 0.53 161 331 2.8 4.4 <0.1 <0.1 150 184 12.8 7.3 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside f the Site drainauet m. seDarateci bv a hvdr.l..ic divide. AL-1001 01/O1/2016 <0.5 0.78 <0.1 <25 <0.08 0.042 <0.5 <0.1 <50 NA 2.7 2.5 <0.5 <0.5 296 60.4 <0.1 200 0.78 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site drainage system, separated by a hydrologic divide. GWA-9S/D/BR, located between the source areas and AL- AL-1002 01/01/2016 <0.5 1.2 <0.1 <25 <0.08 <0.03 <0.5 <0.1 <50 NA 2.7 3.2 <0.5 <0.5 177 4.3 <0.1 103 2.4 No All COIs are below com arative criteria AL-1003 01/01/2016 <0.5 1.1 <0.1 <25 <0.08 0.052 <0.5 <0.1 <50 NA <0.5 4.1 <0.5 <0.5 151 5.9 <0.1 133 2.2 No All COIs are below com arative criteria AL-1004 01/O1/2016 <0.5 1.5 <0.1 <25 <0.08 0.1 <0.5 <0.1 <50 NA 0.54 1.8 <0.5 2 235 4.9 <0.1 183 5.6 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site drainage system, separated by a hydrologic divide. GWA-9S/D/BR, located between the source areas and AL- inni AL-1005 Ol/Ol/2016 <0.5 <0.1 <0.1 <25 <0.08 1.6 1.6 <0.1 <50 NA 0.85 <0.5 <0.5 <0.5 80.9 <2 <0.1 65 4.3 No Northwest and upgradient of the Site. Not within the direction of igroundwater flow from the ash basins or coal piles. arated AL-1006 01/01/2016 <0.5 0.99 <0.1 <25 <0.08 0.2 <0.5 <0.1 <50 NA <0.5 1.8 <0.5 0.96 121 3.7 <0.1 118 N All I r below m r iv ri ri AL-1007 01/O1/2016 <0.5 <0.1 <0.1 <25 <0.08 3 3.1 <0.1 112 NA 2.6 <0.5 <0.5 <0.5 280 3 <0.1 127 3.9 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside fth it r in t m I n h r l i ivi AL-1008 O3/Ol/2016 <0.5 <0.1 <0.1 <25 <0.08 1.8 2.2 <0.1 <50 NA 1.3 <0.5 <0.5 <0.5 168 2.2 <0.1 108 6.7 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside AL-1009 01/O1/2016 <0.5 0.12 <0.1 <25 <0.08 0.82 1.4 <0.1 <50 NA 0.91 <0.5 <0.5 <0.5 202 <2 <0.1 139 5.4 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside f h r in t m r t h r l i divide, AL101 05 22 2015 <0.5 <0.5 <0.2 <5 <0.08 0.61 2.9 <0.5 <50 NA 6.9 <0.5 1.6 <0.5 72.5 <0.002 <0.1 40 4 No All COIs are below comparative criteria AL-1010 01/O1/2016 <0.5 0.12 <0.1 <25 <0.08 5.9 5.8 <0.1 <50 NA 1.1 <0.5 <0.5 <0.5 145 <2 <0.1 106 5.5 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside AL-SOSl O1/O1/2016 <0.5 0.12 <0.1 <25 <0.08 2.8 2.7 <0.1 <50 NA 2 <0.5 <0.5 <0.5 146 <2 <0.1 93 5.9 No South and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside f h r in t m r t h r l i ivi AL-1012 01/01/2016 <0.5 1 1.1 <0.1 <25 <0.08 0.047 0.92 <0.1 <50 NA 2.5 3 0.83 1 <0.5 249 1 10.3 <0.1 98 0.6 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside 0. AL-1013 01/O1/2016 <0.5 3.1 <0.1 <25 <0.08 0.09 <0.5 <0.1 <50 NA <0.5 2.8 <0.5 <0.5 277 6.2 <0.1 137 4.2 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside f h drainage t m r h r l i ide AL-1014 01/O1/2016 <0.5 0.1 <0.1 <25 <0.08 0.31 0.6 <0.1 <50 NA <0.5 <0.5 <0.5 <0.5 210 2.1 <0.1 128 6.7 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site drainage system, separated by a hydrologic divide. GWA-9S/D/BR, located between the source areas and AL- nt um. AL-SOSS 01/01/2016 <0.5 1.1 <0.1 <25 <0.08 <0.03 <0.5 <0.1 <50 NA 8.4 3.9 <0.5 <0.5 162 10.5 <0.1 130 <0.3 No All COIs are below com arative criteria AL-1016 01/O1/2016 <0.5 0.16 <0.1 <25 <0.08 2 2.2 <0.1 <50 NA <0.5 <0.5 <0.5 <0.5 184 2.3 <0.1 146 10.4 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside 0. seD div of the Site drai race syste m. AL-1017 01/O1/2016 <0.5 0.82 <0.1 <25 <0.08J0.2 5.6 0.1 968 NA 14 4 1.2 <0.5 256 6.4 <0.1 116 3.5 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the it drainage t m r t h r l is ivi AL-1018 AL102 Ol Ol 2016 04/29/2015 <0.5 <0.5 <0.2 <25 9.5 0.1 <0.08 2.6 <0.1 <0.5 3870 <50 N NA <0.5 <0.5 <0.5 0.79 <0.5 <0.5 206 116 3.4 <2 <0.1 <0.1 109 9 No No Invalid dataset H or turbidit issues West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside the Sit vst AL-1020 01/O1/2016 <0.5 0.17 <0.1 <25 <0.08 0.58 <0.1 405 NA 5.2 <0.5 <0.5 <0.5 228 <2 <0.1 145 5.9 No South and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside f h r in t m r h r l i ivi AL-1021 01/01/2016 <0.5 0.12 <0.1 <25 <0.08 0.81 <0.1 <50 NA <0.5 <0.5 <0.5 <0.5 204 <2 <0.1 111 3.6 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside AL-1022 01/O1/2016 <0.5 1.4 <0.1 <25 <0.08 <0.5 <0.1 150 NA <0.5 2 <0.5 <0.5 96.7 6.4 <0.1 112 16.3 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside ha it r in system, separated h r l i ivi AL-1023 01/01/2016 <0.5 <0.1 <0.1 <25 <0.08 0.99 <0.1 <50 NA 1.6 <0.5 <0.5 <0.5 134 <2 <0.1 92 4.5 No All COIs are below comparative criteria AL-1024 03/03/2016 <0.5 1.8 <0.1 <25 <0.08 0.75 <0.1 69.8 NA 3 2.9 <0.5 0.77 297 4.9 <0.1 145 14. No West and upgradient of the Site. Not within the directionogroundwater Flow from the ash basins or coal piles. Outside hvdro AL-1025 01/O1/2016 <0.5 0.24 <0.1 <25 <0.08 3.7 <0.1 <50 NA 0.57 0.82 <0.5 <0.5 139 1.2 <0.1 110 10.3 No Westand upgradient of the Site. Not withinthedirection of groundwater Flow from the ash basins or coal piles. Outside fth it r in t m r t a h droiideAL-1026 O1 O1 2016 <0.5 0.67 <0.1 <25 <0.08 0.83 <0.1 119 NA 3 1.4 <0.5 0.56 122 3 <0.1 83 11 No All COIs are below com arative criteria AL-1027 Ol Ol 2016 <0.5 0.16 <0.1 <25 <0.08 <0.5 <0.1 <50 NA <0.5 0.78 <0.5 <0.5 136 4.5 <0.1 123 11.9 No All COIs are below com arative criteria AL103 AL11 02 25 2015 03/17/2015 <3 <10 <1 <500 <100 0.22 <1 <10 <20 2.28 0.74 <5 2700 <50 NA <10 0.7 <10 <10 <10 110 135 <1 <10 <1 <1 104 9.1 4.35 No No Invalid dataset H or turbidit issues West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site drainage system, alonga hydrologic divide. ALS1 05 08 2015 <0.5 <0.5 <0.2 <5 <0.08 1.6 2.6 <0.5 <50 NA <0.5 <0.5 0.64 <0.5 153 2.2 <0.1 118 5.2 AL110 05 18 2015 <0.5 <0.5 <0.2 <5 <0.08 1.7 2.1 <0.5 <50 NA <0.5 1 <0.5 <0.5 110 2 <0.1 110 11.3 No West and uoaradient of the Site. Not within the direction of roundwater flow from the ash basins or coal piles. AL111 02/19/2015 0.1 <1 <1 43 0.067 <10 0.8 0.068 <50 NA 2 <2 0.7 <1 110 0.6 0.063 140 9.5 No South and sidegradient of the Site. Chromium (VI) is not a COI associated with the Allen source areas. AL111 07 30 2015 <0.5 <0.5 <0.2 <5 <0.08 1.1 1.3 <0.5 <50 NA 1.2 <0.5 0.56 <0.5 120 2.8 <0.1 109 10.4 AL112 04/28/2015 <0.5 1.2 <0.2 9.2 <0.08 0.05 <0.5 <0.5 <50 NA 0.65 2.9 <0.5 0.71 187 6.5 <0.1 144 4 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside the Site draina e sys AL113 04 28 2015 <0.5 <0.5 <0.2 <5 <0.08 2 2.8 <0.5 <50 NA 0.66 0.64 <0.5 <0.5 169 2.2 <0.1 108 11.4 N West and a radient of th h in hr mi m VI i not a COI associated wi h h Allen source areas. AL114 04/28/2015 <0.5 <0.5 <0.2 <5 <0.08 2.2 2.7 <0.5 <50 NA 0.97 0.64 <0.5 <0.5 162 2.3 <0.1 128 10.5 N Westnd u r dient f th h in hr mi m VI i n t a COI as ociat d wi h h All n ource areas. AL115 04/28/2015 <0.5 0.82 <0.2 38.8 <0.08 0.16 0.63 <0.5 238 NA 23.9 2.7 0.89 <0.5 3400 373 <0.1 675 5.3 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside f the Site drainauet m. seDarated bv a hvdroloaic divide. AL117 03/23/2215 0.089 <1 <1 120 <1 <10 1.4 0.11 200 NA 3.5 1.1 1.6 1 440 34 <1 270 5.1 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem se crated by a h drolo is divide. AL117 07 31 2015 <0.5 <0.5 <0.2 42 <0.08 0.15 0.95 <0.5 118 NA 2.6 0.68 1.2 1.8 463 38.3 <0.1 254 5.4 AL118 02/10/2015 <1 <5 <1 <100 <0.1 <10 2 <1 <50 NA <5 <5 <5 <5 230 1.09 <0.1 1O6 6 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem alon a h drolo is divide. AL118 08 03 2015 <0.5 <0.5 <0.2 <5 <0.08 2.3 2.8 <0.5 <50 NA <0.5 <0.5 1.1 <0.5 183 <2 <0.1 107 10.6 AL119 04 27 2015 <0.5 1.2 <0.2 7.4 <0.08 0.056 1.3 <0.5 144 NA 6.6 3.4 0.81 <0.5 129 5.6 <0.1 114 3.1 No All COIs are below com arative criteria AL12 04/27/2015 <0.5 <0.5 <0.2 <5 <0.08 1.5 1.7 <0.5 <50 NA 0.8 <0.5 <0.5 <0.5 286 4.5 <0.1 146 2.4 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside AL120 04 29 2015 <0.5 1.1 <0.2 15.8 <0.08 <0.03 <0.5 <0.5 <50 NA 8.9 3.6 <0.5 <0.5 162 11.2 <0.1 128 <1 No All COIs arew c m r tiv ri ri AL121 05/19/2015 <0.5 <0.5 <0.2 <5 <0.08 1.7 2 <0.5 <50 NA 1 <0.5 <0.5 <0.5 67.1 <2 <0.1 73 13.1 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside fth it r in t m r h r l i divide. AL122 05/19/2015 <0.5 <O.5 <0.2 <5 <0.08 0.25 1.6 0.66 4300 NA 23.1 <0.5 2.7 <O.5 285 <2 <0.1 129 8.4 No Invalid dat! t; pH or turbidity issues AL122 08 14 2015 <0.5 <0.5 <0.2 <5 <0.08 0.21 1.1 0.56 2100 NA 17.3 <0.5 2 <0.5 248 <2 <0.1 117 6.3 AL123 01 15 2011 <0.5 <0.5 <0.2 <5 <0.08 2 2.2 <0.5 <50 NA 0.74 <0.5 1.1 <0.5 173 <2 <0.1 160 7.6 No All COIs are below com arative criteria AL124 05/21/2015 <0.5 <0.5 <0.2 <5 <0.08 1 1.1 <0.5 <50 NA <0.5 0.56 <0.5 <0.5 198 2.6 <0.1 133 9.3 No South and sidegradient of the Site. Chromium (VI) is not a COI associated with the Allen source areas. Strontium value AL125 OS 18 2015 <0.5 3.6 <0.2 5.6 <0.08 <0.03 <0.5 <0.5 <50 NA 6.7 7 <0.5 <0.5 111 6.9 <0.1 97 <1 N All I r below m r iv ri Jeri. AL126 05 28 2015 <0.5 <0.5 <0.2 <5 <0.08 4.2 4.4 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 118 2.1 <0.1 103 12 N h n r n f h i hr mi m VI n I wi h h Allen rareas. AL127 OS 19 2015 <0.5 <0.5 <0.2 <5 <0.08 4.4 5 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 130 <2 <0.1 109 10.6 N th n r n f h i hr mi m VI n I wi h th Allen rareas. AL129 05/20/2015 <0.5 <0.5 <0.2 <5 <0.08 0.41 0.63 <0.5 <50 NA 0.87 <0.5 <0.5 <0.5 225 2.8 <0.1 182 6.8 No West and upgradient of the Site. Not withtio in the direcn of groundwater flow from the ash basins or coal piles. Outside r. Page 1 of 4 TABLE 6-9 WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Analytical Parameter Antimony Arsenic Beryllium Boron Cadmium C rommm VI Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Tota Dissolved Vanadium Impacted by Coal Ash? Comments Reporting Units uq/L uq/L uq/L uq/L uq/L uq/L uq/L I pa/L uq/L uq/L uq/L uq/L I uq/L uq/L uq/L mq/L uq/L mq/L uq/L 15A NCAC 02L Standard 1* 10 4* 700 2 NE 10 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* Background Threshold Values Bedrock Unit 0.5 1.6 0.1 50 0.08 0.23 5.6 0.3 284 NE 278 8.9 3.4 0.5 154 2.9 0.1 165 15.9 Background Threshold Values Bedrock Unit 2.6 1.6 0.1 50 0.08 0.765 10.19 0.3 1,242 26.3 360 11 6.944 0.5 181 7.3 0.1 221 12.5 Back round Data Set Range Bedrock Uri 0.27 1 - 3.9 0.24 - 1.6 0.01 J - <0.1 35.6 1 - <50 <0.08 1 <0.025 - 0.66 0.33 J - 8.9 10.021 i - 0.31 40.7 i - 7151 0.9 i - 26.3 2.8 1 - 278 1.7- 10.5 10.22 i - 5.8 0.17 J - <0.5 97.7 - 223 1.8 - 33.3 0.02 i - <0.1 104 - 222 7.5 - 15.9 Sample ID Sample ollection Date Analytical Results AL130 05/21/2015 <0.5 <0.5 <0.2 <5 <0.08 2.4 2.4 <0.5 <50 NA 1.1 <0.5 <0.5 <0.5 106 <2 <0.1 110 7.9 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem se arated bv a h drolo is divide. AL131 05/28/2015 <0.5 <0.5 <0.2 <5 <0.08 0.78 1.1 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 59.5 <2 <0.1 75 7.9 No North and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside AL132 07/30/2015 <0.5 <0.5 <0.2 <5 <0.08 0.93 0.98 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 234 2.1 <0.1 133 7.8 No South and sidegradient of the Site. Chromium (VI) is not a COI associated with the Allen source areas. Strontium value is slightly greater than the bedrock flow zone background range, but is less than the shallow and deep Flow zone AL133 05 28 2015 <0.5 <0.5 <0.2 <5 <0.08 0.72 0.95 <0.5 273 NA 5.2 <0.5 <0.5 <0.5 89.9 <2 <0.1 99 7.4 aq.. All COIs arew comoarative criteria AL135 08/27/2015 <0.5 <0.5 <0.2 <5 <0.08 2.1 2.4 <0.5 88.6 NA 3 <0.5 <0.5 <0.5 180 2.1 <0.1 107 7 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside f the Site drainauet m. seDarated bv a hvdroloaic divide. AL136 05/18/2015 <0.5 <0.5 <0.2 <5 <0.08 2.8 3.3 <0.5 52.8 NA 0.82 <0.5 0.57 <0.5 378 2.1 <0.1 233 4.5 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside AL137 07/28/2015 <0.5 <0.5 <0.2 <5 <0.08 0.33 <0.5 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 155 4.6 <0.1 101 6.5 1 No All COIs arew comoarative criteria AL138 08/05/2015 <0.5 <0.5 <0.2 <5 <0.08 1.2 1.4 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 215 <2 <0.1 160 6.4 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside f the it rin t m r tria hydrologic divide. AL139 07/28/2015 <0.5 <0.5 <0.2 <5 <0.08 0.64 0.81 <0.5 <50 NA 4.1 <0.5 <0.5 <0.5 81.4 2.7 <0.1 81 5.4 No All COIs are below com arative crite AL14 02/10/2015 <1 <5 <1 <100 <0.1 5 4 <1 <50 NA <5 <5 <5 <5 360 6.92 <0.1 214 2 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside the Site ramaae system. id AL140 07/28/2015 <0.5 <0.5 <0.2 <5 <0.08 2.4 2.5 <0.5 58.4 NA 2 <0.5 <0.5 <0.5 189 2.8 <0.1 151 4.7 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside f the Site drainauetm. alono a h drolooic divide. AL141 07/28/2015 <0.5 <0.5 <0.2 <5 0.092 4.4 3.9 <0.5 <50 NA 1.8 <0.5 0.58 <0.5 104 <2 <0.1 98 12.8 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside AL142 08 27 2015 <0.5 <0.5 <0.2 <5 <0.08 0.079 0.89 <0.5 958 NA 21.3 <0.5 0.71 <0.5 125 <2 <0.1 105 4.9 N All I r below c m r tiv criteria AL15 03/02/2015 <3 <10 <1 <100 <1 <20 <10 <5 14.5 NA <10 <10 <10 <10 222 <10 <1 138 3.68 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem alonga h drolo is divide. AL15 05 19 2015 <0.5 <0.5 <0.2 10.9 <0.08 1.8 2 <0.5 <50 NA 1.8 <0.5 <0.5 <0.5 227 4.6 <0.1 156 4.8 AL16 AL16 02/10/2015 07 29 2015 71 <0.5 <5 <0.5 <0.2 <5 <0.08 <10 1.8 1.7 <1 <0.5 510 <50 NA NA 9 0.87 <5 <0.5 <5 <0.5 <5 <0.5 150 128 <1 <0.1 96 3 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem alon a h drolo is divide. <2 <0.1 116 4.2 AL17 02/16/2015 <3 <10 <1 <100 <1 <20 <10 <5 57.7 NA 1.37 <10 <10 <10 160 <10 <1 106 5.58 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL17 05112015 <0.5 <0.5 <0.2 <5 <0.08 1.1 1.4 <0.5 59.3 NA 1.7 <0.5 <0.5 <0.5 168 2.1 <0.1 130 7.8 AL19 03/02/2015 <3 <10 <1 <100 <1 <20 <10 <5 19.4 NA <10 <10 <10 <10 228 <10 <1 155 3.84 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL19 05 12 2015 <0.5 <0.5 <0.2 <5 <0.08 2.6 2.7 <0.5 <50 NA 1.1 <0.5 <0.5 <0.5 233 <2 <0.1 157 4.5 AL2 04/29/2015 <0.5 0.64 <0.2 6.6 <0.08 1 1.5 <0.5 <50 NA 0.92 1.2 <0.5 0.66 142 3 <0.1 114 9.9 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside f h it rin t m r t h r l i divide. AL20 02/16/2015 <3 <10 <1 <100 <1 <20 <10 <5 <50 NA <10 <10 <10 <10 165 <10 <1 84 10.3 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL20 05 19 2015 <0.5 <0.5 <0.2 <5 <0.08 1.4 1.6 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 160 2.1 <0.1 134 12 AL-2000-RAW 10 18 2017 <0.5 0.17 <0.1 49 <0.08 0.029 2.3 <0.1 <50 NA <0.5 2.2 <0.5 0.79 2.4 105 <0.1 263 <0.3 No All COIs are below com arative criteria AL-2001-RAW 10/17/2017 <0.5 0.46 <0.1 <25 0.13 0.2 0.98 <0.1 <50 NA 0.65 1 <0.5 <0.5 207 1.5 <0.1 137 6.4 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem separated b a hydrologic divide. AL-2001-RAW 12 04 2017 <0.5 0.74 <0.1 <5 <0.08 0.2 <0.5 <0.1 <50 NA 0.93 1.3 <0.5 <0.5 225 2.6 <0.1 141 6 AL-2003-RAW 10/17/2017 <0.5 0.1 <0.1 <25 0.11 1.6 1.7 <0.1 <50 NA 0.54 <0.5 <0.5 <0.5 262 1.6 <0.1 90 9.7 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL-2003-RAW 12 19 2017 <0.5 <0.1 <0.1 <5 <0.08 1.5 1.7 <0.1 <50 NA <0.5 <0.5 <0.5 <0.5 257 1.8 <0.1 161 9.4 AL-2005-RAW 11 02 2017 <0.5 1.3 0.25 <25 <0.08 1.3 1.7 <0.1 <50 NA 1.6 4.2 <0.5 0.68 114 3.2 <0.1 102 3.5 No South and side radient of the Site. Chromium VI is not a COI associated with the Allen source areas. AL-2007-RAW 11 02 2017 <0.5 0.22 <0.1 <25 0.19 6.8 6.9 <0.1 <50 NA <0.5 <0.5 <0.5 <0.5 74.9 <1 <0.1 91 7.9 No South and side radient of the Site. Chromium VI is not a COI associated with the Allen source areas. AL-2008-RAW 11 02 2017 <0.5 0.25 0.14 <25 <0.08 1.7 2.1 <0.1 <50 NA <0.5 <0.5 <0.5 <0.5 120 <1 <0.1 109 11 No South and side radient of the Site. Chromium VI is not a COI associated with the Allen source areas. AL-2010-RAW 10 18 2017 <0.5 0.11 <0.1 <25 <0.08 1.1 2.5 <0.1 <50 NA <0.5 <0.5 1.2 <0.5 173 1.1 <0.1 121 11.9 No South and side radient of the Site. Chromium VI is not a COI associated with the Allen source areas. AL-2012-RAW 10/17/2017 <0.5 0.16 <0.1 <25 <0.08 1.7 2.5 <0.1 131 NA 5.8 0.52 0.76 <0.5 87.8 <1 <0.1 135 9.5 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem se arated by a h drolo is divide. AL-2012-RAW 12 19 2017 <0.5 0.18 <0.1 <5 <0.08 1.8 2.1 <0.1 <50 NA 2.4 0.53 <0.5 <0.5 89.3 <1 <0.1 91 9.1 AL-2013-RAW 10/18/2017 <0.5 0.15 <0.1 <25 <0.08 0.59 0.76 <0.1 <50 NA 1.1 <0.5 <0.5 <0.5 150 1.5 <0.1 109 10.5 No All COIs are below comparative criteria AL-2013-RAW 12 20 2017 <0.5 0.14 <0.1 <5 <0.08 0.66 0.84 <0.1 <50 NA <0.5 <0.5 <0.5 <0.5 144 1.9 <0.1 112 10.4 AL21 02/16/2015 <3 <10 <1 <100 <1 <20 <10 <5 <50 NA <10 <10 <10 <10 152 <10 <1 84 11.7 No All COIs are below comparative criteria AL21 05 12 2015 <0.5 <0.5 <0.2 <5 <0.08 0.74 0.92 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 158 2.2 <0.1 119 12.6 AL22 05 21 2015 <0.5 <0.5 <0.2 <5 <0.08 0.39 0.58 <0.5 <50 NA <0.5 2.2 <0.5 <0.5 109 3.2 <0.1 133 8.9 No All COIs are below com arative criteria AL23 02/03/2015 <1 <1 <0.4 <25 <0.1 <20 <5 0.79 10 NA 1.4 0.57 1.5 <1 100 0.64 <0.5 57 13 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL23 OS 14 2015 <0.5 <0.5 <0.2 <5 <0.08 1.1 1.5 <0.5 <50 NA 1.1 0.54 0.51 <0.5 110 2.2 <0.1 94 13.4 AL24 02/11/2015 <1 <5 <1 <100 <0.1 <10 <1 <1 <50 NA <5 2 <5 <5 82 1.86 <0.1 99 12 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL24 08 03 2015 <0.5 <0.5 <0.2 <5 <0.08 0.77 0.89 <0.5 <50 NA <0.5 2.5 <0.5 <0.5 80.7 3.8 <0.1 107 12.5 AL25 02/25/2015 0.081 <1 <1 <500 <1 <10 1.4 <1 <50 NA 0.63 0.14 0.24 <1 230 <1 <1 140 4.3 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL25 07 30 2015 <0.5 <0.5 <0.2 <5 <0.08 2.3 2.7 <0.5 <50 NA <0.5 <0.5 0.53 <0.5 240 <2 <0.1 143 5.3 AL26 02/19/2015 <3 <10 <1 <100 <1 <20 <10 <5 15.6 NA <10 <10 <10 <10 178 <10 <1 102 6.08 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL26 OS 13 2015 <0.5 <0.5 <0.2 <5 <0.08 0.55 0.79 <0.5 <50 NA 0.68 <0.5 <0.5 <0.5 187 2.5 <0.1 147 7.6 AL27 02/11/201, <1 <5 <1 <100 <0.1 <10 2 <1 <50 NA <5 <5 <5 <5 230 <1 <0.1 144 4 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL27 08 17 2015 <0.5 <0.5 <0.2 <5 <0.08 1.8 2 <0.5 <50 NA 1.2 <0.5 0.53 <0.5 221 <2 <0.1 166 4.2 AL28 02 18 2015 <0.4 0.18 <0.11 <20 <0.06 2.05 2.05 <0.03 <25 NA <0.84 0.95 0.2 <0.16 75 <5 <0.06 152 13 No West and u radient of the Site. Not within the direction of roundwater Flow from the ash basins or coal iles. AL29 02/25/2015 0.072 <1 <1 <500 <1 <10 2.3 <1 <50 NA 0.64 0.32 0.55 <1 72 <1 <1 92 8.3 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL29 07 29 2015 <0.5 <0.5 <0.2 <5 <0.08 2.2 2.1 <0.5 <50 NA 0.65 <0.5 <0.5 <0.5 86.4 <2 <0.1 100 6.8 AL3 03/04/201, 0.2 <1 <1 49 <1 <10 1.1 0.099 100 NA 5.2 0.36 0.33 <1 74 0.15 <1 70 6.8 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site drainage system, a h drolo is divide. stem separatedby AL3 07 29 2015 <0.5 <0.5 <0.2 7.1 <0.08 1.9 1.9 <0.5 <50 NA 0.54 <0.5 <0.5 <0.5 80.2 <2 <0.1 83 7.7 AL30 02/19/20215 <3 <10 <1 <100 <1 <20 2.41 <5 <50 NA <10 <10 <10 <10 210 <10 <1 113 5.07 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL30 OS 15 2015 <0.5 <0.5 <0.2 <5 <0.08 3.5 3.6 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 220 <2 <0.1 122 5.8 AL31 04/09/2015 1.16 <0.08 <0.11 43 <0.06 <5 2.47 <0.02 92.8 NA 2.59 <0.11 0.5 0.22 89 <5 <0.06 88.6 22.6 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL31 08 13 2015 <0.5 <0.5 <0.2 <5 <0.08 1.7 2 <0.5 <50 NA 1.1 <0.5 <0.5 <0.5 90 <2 <0.1 70 2.9 AL32 07 29 2015 <0.5 <0.5 <0.2 <5 <0.08 2.7 2.4 <0.5 <50 NA 1.1 <0.5 <0.5 <0.5 157 <2 <0.1 100 2.7 No West and u radient of the Site. Not within the direction of roundwater Flow from the ash basins or coal iles. AL33 02/16/2015 <3 <10 <3 <100 <1 <20 <10 <5 <50 NA <10 <10 <10 <10 119 <10 <1 52 5.38 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL33 05/15/2015 <0.5 <0.5 <0.2 <5 <0.08 4.1 4.2 <0.5 <50 NA <0.5 <0.5 0.53 <0.5 127 <2 <0.1 116 6.4 No AL34 02/16/2015 <3 <10 <1 <100 <1 <20 <10 <5 <50 NA <10 <10 <10 <10 139 <10 <1 82 8.43 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL34 05 14 2015 <0.5 <0.5 <0.2 <5 <0.08 2.3 2.6 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 146 2.2 <0.1 108 10.1 AL39 WELL A 02/17/2015 <0.5 <0.08 <0.11 <20 <0.06 <1.5 2.18 <0.03 <15 NA <0.84 3.67 0.46 <0A6 134 5 <0.06 112 3.54 No West and upgradient of the Site. Chromium (VI) is not a COI associated with the Allen source areas. AL39 WELL 07 30 2015 <0.5 <0.5 <0.2 <5 <0.08 0.76 0.84 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 103 <2 <0.1 77 2.9 AL39 WELL B 02/17/2015 <0.4 0.92 <0.11 <20 <0.06 <1.5 1.08 <0.04 <15 NA <0.43 0.16 0.26 1.81 115 <5 <0.06 212 13.1 No All COIs are below comparative criteria AL39 WELL B 07 30 2015 <0.5 0.86 <0.2 <5 <0.08 0.18 0.85 <0.5 271 NA 8.9 3.7 <0.5 1.6 124 6.5 <0.1 139 12.7 AL40 02/17/2011 0.42 <0.08 <0.11 <20 <0.06 <1.5 0.6 <0.03 15.3 NA 1.36 0.34 0.19 <0.16 71 <5 <0.06 87 3.15 No All Cols are below comparative criteria AL40 08 03 2015 <0.5 <0.5 <0.2 <5 <0.08 0.19 1.1 <0.5 <50 NA 1.3 <0.5 <0.5 <0.5 68.5 <2 <0.1 64 3.4 AL41 OS 21 2015 <0.5 <0.5 <0.2 <5 <0.08 0.12 <0.5 <0.5 <50 NA <0.5 0.69 <0.5 <0.5 47.2 <2 <0.1 49 3.5 N All COIs arew corruarative criteria AL42 02/03/2015 0.14 <1 0.04 <25 <0.1 <20 <5 0.085 200 NA 0.58 0.21 0.66 <1 80 0.34 <0.5 56 2.9 No All COIs are below comparative criteria AL42 05 15 2015 <0.5 <0.5 <0.5 <0.5 <0.2 <0.2 1 <5 26.9 <0.08 <0.08 0.17 0.89 <0.5 <0.5 1.4 <50 <50 NA NA <0.5 9.2 <0.5 <0.5 <0.5 1.1 <0.5 <0.5 80.3 31.8 <2 <2 <0.1 <0.1 62 63 3.6 <1 AL44 04/24/2015 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside f h rin m n h r l ivi AL45 02/03/2015 0.31 <1 0.064 <25 <0.1 <20 0.74 0.089 1400 NA 4.1 0.39 0.77 <1 80 <1 <0.5 61 8.2 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem alon a h drolo is divide. AL45 OS 15 2015 <0.5 <0.5 <0.2 <5 <0.08 0.69 0.89 <0.5 <50 NA 0.6 <0.5 <0.5 <0.5 77 <2 <0.1 74 5.3 AL47 02/11/2015 <1 <5 <1 <100 <0.1 <10 2 <1 <50 NA <5 <5 <5 <5 240 1.02 <0.1 167 4 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site drainage s stem alon a h drolo is divide. AL47 10 22 2015 <0.5 <0.5 <0.2 <5 <0.08 2.2 2.6 <0.5 70.9 NA 2.6 <0.5 <0.5 <0.5 276 <2 <0.1 229 3.6 AL48 02/20/2015 0.064 0.5 <1 68 0.063 <10 7.5 <1 4000 NA 4.7 0.14 <2 <1 160 1.8 0.08 100 16 No West and upgradient of the Site. Not within the direction of groundwater flow from the ash basins or coal piles. Outside of the Site drainage system, along a hydrologic divide. AL48 08 17 2015 <0.5 <0.5 <0.2 <5 <0.08 3.8 4.4 <0.5 <50 NA 2.5 <0.5 <0.5 <0.5 158 4 <0.1 109 6.1 Page 2 of 4 TABLE 6-9 WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Analytical Parameter Antimony Arsenic Beryllium Boron Cadmium C rommm VI Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Tota Dissolved Vanadium Impacted by Coal Ash? Comments Reporting Units uq/L uq/L uq/L uq/L uq/L uq/L uq/L I pa/L uq/L uq/L uq/L uq/L I uq/L uq/L uq/L mq/L uq/L mq/L uq/L 15A NCAC 02L Standard 1* 10 4* 700 2 NE SO 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* Background Threshold Values Bedrock Unit 0.5 1.6 0.1 50 0.08 0.23 5.6 0.3 284 NE 278 8.9 3.4 0.5 154 2.9 0.1 165 15.9 Background Threshold Values Bedrock Unit 2.6 1.6 0.1 50 0.08 0.765 10.19 0.3 1,242 26.3 360 11 6.944 0.5 181 7.3 1 0.1 221 12.5 Back round Data Set Range Bedrock Uri 0.27 1 - 3.9 0.24 - 1.6 0.01 J - <0.1 35.6 1 - <50 <0.08 1 <0.025 - 0.66 0.33 J - 8.9 10.021 i - 0.31 40.7 i - 7151 0.9 i - 26.3 2.8 1 - 278 1.7- 10.5 10.22 i - 5.8 0.17 J - <0.5 97.7 - 223 1.8 - 33.3 0.02 i - <0.1 104 - 222 7.5 - 15.9 Sample ID Sample ollection Date Analytical Results AL49 04/23/2015 <0.5 <0.5 <0.2 <5 <0.08 0.9 1.2 <0.5 <SO NA 0.91 <0.5 <0.5 <0.5 141 2.6 <0.1 117 12.6 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem alona a h drolo is divide. AL5 02/10/2015 <1 <5 <1 <100 <0.1 4 3 <1 75 NA <5 2 <5 <5 110 1.11 <0.1 88 14 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside ALSO WELL 04 29 2015 <0.5 1.5 <0.2 7 <0.08 0.21 <0.5 <0.5 <50 NA <0.5 4.3 <0.5 0.66 91.4 5.9 <0.1 125 5.5 N All COI, are below com arative criteria ALSO WELL B 04 29 2015 <0.5 <0.5 <0.2 5.8 <0.08 0.24 <0.5 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 62.9 <2 <0.1 78 6.7 N All OIs re low com r tive criteria AL50 WELL C 04/29/2015 <0.5 <0.5 <0.2 102 <0.08 1.1 1.8 <0.5 <50 NA <0.5 <0.5 1 <0.5 133 4.9 <0.1 96 3.7 N0 West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site drainage system, alonga h drolo is divide. ALSO WELL C AL51 06 11 2015 02/03/2015 5 <1 <0.5 <1 <0.4 <25 .08 <0.1 70.03 <20 <5 <0.5 0.21 <50 1200 NA <0.5 0.88 <0.5 <10 <0.5 2.1 <0.5 0.31 <0.5 300 NA <1 <0.1 <0.5 NA 160 <1 2 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem alon a h drolo is divide. AL51 OS 14 2015 <0.5 <0.5 <0.2 <5 <0.08 0.43 0.76 <0.5 <SO NA 0.58 <0.5 <0.5 <0.5 346 2 <0.1 178 2.4 AL52 02/20/2015 0.053 <1 <1 62 <1 <10 0.35 <1 <50 NA 0.76 <2 0.46 <1 240 <1 <1 130 3.2 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site drainage s stem al0n a hydrologic divide. AL52 07 29 2015 <0.5 <0.5 <0.2 <5 <0.08 0A2 0.71 <0.5 <50 NA 0.73 <0.5 <0.5 <0.5 232 <2 <0.1 158 3.4 AL53 02/17/2015 <0.4 0.12 <0.11 <20 <0.06 2.9 4.06 <0.03 <15 NA <0.84 <0.11 0.58 <0.16 142 <5 <0.06 75 4.3 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside f h rin m n h r l ivi AL54 02/03/2015 <1 <1 <0.4 <25 <0.1 <20 1.5 0.24 580 NA 3.9 <10 2.2 <1 240 2.8 <0.5 130 3 N0 West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site drainage system, along a hydrologic divide. AL54 OS 15 2015 <0.5 <0.5 <0.2 <5 <0.08 2.9 3.2 <0.5 <50 NA 1.3 <0.5 <0.5 <0.5 251 3.8 <0.1 145 4.4 AL 55 02/03/2015 0.25 0.44 <0.4 <25 <0.1 8.4 0.65 0.21 330 NA 1.4 0.27 1.2 <1 140 1 <0.5 97 6.8 N0 West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site drainage system, alonga hydrologic divide. AL55 SO 22 2015 <0.5 <0.5 <0.2 <5 <0.08 1.5 2 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 131 2.5 <0.1 125 7.5 AL56 02/25/2015 0.12 <1 <1 66 <1 <10 4.5 0.26 920 NA 9.9 0.24 1.7 <1 230 <1 0.057 140 7.6 N0 West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside AL56 AL57 08 13 2015 07/28/2015 <0.5 <0.5 <0.5 <0.2 <0.2 <5 <0.08 <0.08 <0.03 1 2 1.2 1 <0.5 7160 <50 NA NA 1.3 0.51 <0.5 <0.5 <0.5 <0.5 182 205 2.6 <2 <0.1 <0.1 123 8.3 No of the Site drainage system, along a hydrologic divide. West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside AL58 02/03/2015 0.1 <0.5 0.59 0.82 <0.4 <0.2 <25 6.6 <0.1 <0.08 <20 0.24 <5 0.63 0.22 <0.5 <50 NA NA 3.2 4.4 0.49 <0.5 2 <0.5 <1 <0.5 200 203 2.8 4.3 <0.5 <0.1 120 137 SO 12.2 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem alono a h drolo is divide. AL58 OS 15 2015 AL59 04/23/2015 <0.5 <0.5 <0.2 <5 <0.08 2.3 2.5 <0.5 <50 NA 0.78 <0.5 <0.5 <0.5 167 <2 0.24 107 19.1 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL59 06 03 2015 <0.5 <0.5 <0.2 <5 <0.08 2.4 3 <0.5 <50 NA 1.9 <0.5 <0.5 <0.5 183 <2 <0.1 99 17.1 AL6 02/16/2015 <3 <10 <1 <100 <1 <20 <10 <5 <50 NA <10 <10 <10 <10 90.2 <10 <1 81 4.49 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem alon a h drolo is divide. AL6 Q5,153,2015 <0.5 <0.5 <0.2 <5 <0.08 3.2 3.5 <0.5 60.8 NA <0.5 <0.5 <0.5 <0.5 94 2.1 <0.1 86 6.4 AL60 04 22015 <0.5 <0.5 <0.2 <5 <0.08 5.3 5.8 <0.5 56.9 NA 8.6 <0.5 0.96 <0.5 317 <2 <0.1 197 9 N West and u r dient of the Site. N wi hin th direction f r n w r Fl w fr m th h b sins or co it AL61 07/28/2015 <0.5 <0.5 <0.2 <5 <0.08 4.6 4.8 <0.5 <50 NA 0.57 <0.5 <0.5 <0.5 208 3.3 <0.1 148 1 N West and a radient of the Site. N within the direction ofgroundwater flow fr m the ash basins or coal ile . AL62 02/17/2015 <0.4 0.12 <0.11 <20 <0.06 2.26 2.84 <0.03 <15 NA <0.84 0.45 0.42 <0.16 205 <5 <0.06 108 11.2 N West and u r diem of the Site. N within the direction of r n w r Fl w fr m the ash basins or coal ile . AL63 02 17 2015 <0.5 <0.08 <0.11 <20 <0.06 1.94 3.31 4.4 0.05 <0.5 <50 NA NA 2.74 1.6 0.27 <0.5 0.81 2.6 0.25 <0.5 274 424 6 <2 <0.06 <0.1 204 233 7 002 N West and r nt f the it . N wi hin the di recti n f r n w r Fl w fr m the ash basins or co it . West and r nt f theSite. N within the direction f r n w t r flow from theash basins or co it . AL64 04 23 2015 <0.5 <0.5 <0.2 <5 <0.08 4.3 2.8 N AL65 04 24 2015 <0.5 <0.5 <0.2 <5 <0.08 0.25 <0.5 <0.5 <50 NA <0.5 1.1 <0.5 0.52 180 3.2 <0.1 165 6 N All Co" are below comparative criteria AL66 04 24 2015 <0.5 <0.5 <0.2 <5 <0.08 0.38 0.5 <0.5 <50 NA 3.9 <0.5 1.2 <0.5 306 <2 <0.1 160 5.3 N West and a radient f the Site. N within hdirection f r n w t r flow from theh in r I it . AL67 02/25/2015 0.12 0.31 <1 47 <1 <10 0.72 <1 47 NA 2.1 1 0.72 <1 150 0.59 <1 150 12 No All COIs are below comparative criteria AL67 07 29 2015 <0.5 <0.5 <0.2 5.3 <0.08 0.62 0.89 <0.5 <50 NA 0.66 1.2 <0.5 <0.5 132 3.3 <0.1 159 13.3 AL68 08 03 2015 <0.5 <0.5 <0.2 <5 <0.08 1.8 2.8 <0.5 85.9 NA 2.8 0.63 <0.5 <0.5 182 2.7 <0.1 160 15.4 N W t n r nt f th it . N wi hin h it i n f r n w t r fl w fr m th h in r I it AL69 04/27/2015 <0.5 <0.5 <0.2 <5 <0.08 1.2 1.8 <0.5 75.8 NA 1.9 <0.5 <0.5 <0.5 219 <2 <0.1 141 8.4 N West n r nt of the Site. N wi hin h it i n f r n w t r fl w fr m h h in r I it AL7 OS 19 2015 <0.5 <0.5 <0.2 <5 <0.08 0.97 1.2 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 180 <2 <0.1 119 10.9 No West and uDaradient of the Site. Not within the direction of aroundwater flow from the ash basins or coal Diles. AL70 03/17/2015 <3 <10 <1 <100 <1 <20 1.8 <5 33.4 NA <10 <10 <10 <10 240 <10 <1 158 8.09 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. AL70 OS 15 2015 <0.5 <0.5 <0.2 <5 <0.08 1.6 1.8 <0.5 <50 NA <0.5 <0.5 0.57 <0.5 265 2.7 <0.1 162 9.4 AL71 05 22 2015 <0.5 <0.5 <0.2 <5 <0.08 1 1.5 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 256 <2 <0.1 149 9.2 N W n r n f h i . N wi hin h it i n f r n w r Fl w fr m h h in r I it . AL72 OS 22 2015 <0.5 <0.5 <0.2 <5 <0.08 1.1 2.5 <0.5 <50 NA 7.7 <0.5 <0.5 <0.5 265 <2 <0.1 132 5.1 N W n r n f h i . N wi hin h it i n f r n w r Fl w fr m h h in r coal it AL73 02/17/2015 <0.4 0.12 <0.11 <20 <0.06 <5 3.11 <0.03 55 NA <0.84 <0.12 0.75 <0.16 188 <5 <0.06 61 9.6 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem alon a h drolo is divide. AL73 07 29 2015 <0.5 <0.5 <0.2 <5 <0.08 2.4 2.2 <0.5 <50 NA 0.72 <0.5 0.66 <0.5 181 <2 <0.1 133 9.3 AL74 05/08/2015 <0.5 <0.5 <0.2 <5 <0.08 2 2.1 <0.5 <50 NA 2.2 <0.5 <0.5 <0.5 293 <2 <0.1 168 5.8 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside f h rin tm n h rl iviid AL75 02/25/2015 0.095 <1 <1 <500 <1 <10 1.2 <1 <50 NA 1 0.17 0.26 <1 86 <1 <1 110 14 N0 West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem al0n a h drolo is divide. AL75 08 14 2015 <0.5 <0.5 <0.2 <5 <0.08 1.7 2.1 <0.5 <50 NA 1 <0.5 <0.5 <0.5 82 <2 <0.1 99 13.8 AL76 02/17/2015 <0.4 0.13 <0.11 <20 <0.06 2.62 2.62 <0.03 <25 NA 1.5 <0.12 0.45 <0.16 109 <5 <0.06 87 8.34 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside 'i' divide AL77 04/24/2015 <0.5 <0.5 <0.2 <5 <0.08 0.7 1 1 <0.5 <50 NA 0.54 <0.5 <0.5 I <0.5 238 2.5 <0.1 157 8.6 No West and upgradient of the e. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the it rin t m Sitn hydrolooic divide. AL78 04 24 2015 <0.5 <0.5 <0.2 <5 <0.08 0.1 <0.5 <0.5 <50 NA 1 <0.5 <0.5 <0.5 86.1 <2 <0.1 70 2.1 No All COIs are below com arative criteria AL79 OS 18 2015 <0.5 <0.5 <0.2 <5 <0.08 0.33 0.6 <0.5 54.9 NA 0.71 <0.5 <0.5 <0.5 157 2.1 <0.1 104 4.4 No All COIs are below comparative criteria AL8 03/23/2015 0.08 <1 <1 97 <1 <10 3 <1 <50 NA <5 0.4 0.55 <1 240 <1 <1 130 8.1 N0 West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site drainage system, along a hydrologic divide. AL8 07 29 2015 <0.5 <0.5 <0.2 <5 <0.08 3.5 3.1 <0.5 <50 NA 25.9 <0.5 0.7 <0.5 237 <2 <0.1 132 8.5 AL81 07/28/2015 <0.5 <0.5 <0.2 <5 <0.08 0.78 0.73 <0.5 <50 NA 6.5 <0.5 0.95 <0.5 228 <2 <0.1 137 2.2 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside ll AL82 04/27/2015 <0.5 <0.5 <0.2 <5 <0.08 0.81 1.4 <0.5 <50 NA 1.7 <0.5 0.71 <0.5 392 2.1 <0.1 223 4.7 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside f h drainagesystem,n h rl divide. AL83 05/21/2015 <0.5 <0.5 <0.2 <5 <0.08 3.5 3.5 <0.5 <50 NA 1.5 <0.5 1.3 <0.5 289 3.9 <0.1 228 9 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside the Site drainaae vs id AL84 04/27/2015 <0.5 <0.5 <0.2 <5 <0.08 0.59 0.55 <0.5 59.8 NA 15.7 <0.5 <0.5 <0.5 185 <2 <0.1 134 8.2 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside fth rin t m n h r l iviid AL85 04 24 2015 <0.5 <0.2 <5 <0.08 2.5 2.6 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 69.2 <2 <0.1 67 9.6 No South and side radient of the Site. Chromium VI is not a CO! associated with the Allen source areas. AL88 SO 27 2015 <0.5 <0.2 <5 <0.08 0.82 1.4 <0.5 136 NA 34.6 <0.5 0.62 <0.5 83.2 <2 <0.1 63 <1 No South and side radient of the Site. Chromium VI is not a COI associated with the Allen source areas. AL89 02/25/2015 0.31 <1 67 <1 <10 2.9 <1 <50 NA 0.72 0.39 0.44 <1 120 <1 0.1 140 11 No South and sidegradient of the Site. Chromium (VI) is not a COI associated with the Allen source areas. AL89 07 30 2015 <0.5 <0.2 <5 <0.08 4 4 <0.5 <50 NA <0.5 <0.5 <0.5 <0.5 113 <2 <0.1 75 12 AL9 02/10/2015 ;0.14 <5 <1 <100 <0.1 5 6 <1 <50 NA <5 <5 <5 <5 300 1.22 <0.1 165 7 No West and upgradientof the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside the Site drainace vs id AL90 AL90 02/11/2015 07 30 2015 <0.5 <0.2 0 <5 <0.1 <0.08 <10 1.9 2.4 <0.5 283 NA 8.4 <0.5 0.72 <0.5 160 142 <1 <2 <0.1 101 5.5 South and sidegradient of the Site. Chromium (VI) is not a COI associated with the Allen source areas. AL91 04 27 2015 <0.5 <0.2 <5 <0.08 1.5 2.1 <0.5 67.6 NA 0.5 <O.5 <0.5 <0.5 127 2 <0.1 98 12.2 N th n r di nt f h i hr mi m VI n I wi h h All n r rAL92 02/12/2015 <5 <1 <S00 <0.1 <SO <1 <1 <50 NA <5 <5 <5 <5 110 <1 <0.1 65 5 No All COIs are below comparative criteria AL92 OS 03 2015 <0.5 <0.5 <0.2 <5 <0.08 0.46 1.2 <0.5 <50 NA 0.5 <0.5 <O.5 <0.5 125 <2 <0.1 90 5.1 AL93 02/20/2015 0.064 <1 <1 90 <1 <10 1.3 0.099 94 NA 7.7 0.77 0.68 <1 82 <1 <1 80 9.6 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem separated b a h drolo is divide. AL93 08 17 2015 <0.5 <0.5 <0.2 <5 <0.08 1.5 2.4 <0.5 52.3 NA 5.2 0.61 <O.5 <0.5 81.8 <2 <0.1 98 9.7 AL94 02/17/2011 <0.4 2.39 <0.11 <20 <0.06 <5 1.3 <0.03 16.3 NA <0.84 4.84 0.56 2.49 142 5 <0.06 156 26.5 No West and upgradient of the Site. Not within the direction of groundwater Flow from the ash basins or coal piles. Outside of the Site draina e s stem separated b a h drolo is divide. AL94 08 27 2015 <O.5 2.4 <0.2 5.5 <0.08 0.18 <0.5 <0.5 <50 NA <0.5 5.1 <0.5 1.7 131 5.4 <0.1 124 24.9 AL95 AL96 OS OS 2015 02/19/2015 <0.5 <0.4 <0.5 0.16 <0.2 <0.11 <20 <0.08 <0.06 1.3 <5 1.8 0.82 <0.5 <0.03 1980 <25 NA NA 39.7 <0.84 <0.5 <0.11 0.71 0.18 <0.5 <0.16 186 141 <2 <5 <0.1 <0.06 91 2.5 6.8 N No Inv h H r r i All COIs are below comparative criteria AL 14 2 1 < .5 <0.5 <0.2 <5 <0.0 F. 0.75 <O.5 <50 NA <0.5 <O.5 % <0.5 123 <2 <O.1 0 5.9 Page 3 of 4 TABLE 6-9 WATER SUPPLY WELL ANALYTICAL RESULTS SUMMARY CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Analytical Parameter Antimony Arsenic Beryllium Boron Cadmium C rommm VI Chromium Cobalt Iron Lithium Manganese Molybdenum Nickel Selenium Strontium Sulfate Thallium Tota Dissolved Vanadium Impacted by Coal Ash? Comments Reporting Units uq/L uq/L uq/L uq/L uq/L uq/L uq/L I pa/L pq/L uq/L uq/L uq/L I uq/L uq/L uq/L mq/L uq/L mq/L uq/L 15A NCAC 02L Standard 1* 10 4* 700 2 NE 10 1* 300 NE 50 NE 100 20 NE 250 0.2* 500 0.3* Background Threshold Values Bedrock Unit 0.5 1.6 0.1 50 0.08 0.23 5.6 0.3 284 NE 278 8.9 3.4 0.5 154 2.9 0.1 165 15.9 Background Threshold Values Bedrock Unit 2.6 1.6 0.1 50 0.08 0.765 10.19 0.3 1,242 26.3 360 11 6.944 0.5 161 7.3 0.1 221 12.5 Background Data Set Range Bedrock UnitY 0.27 1 - 3.9 0.24 - 1.6 0.011 - <0.1 35.6 1 - <50 <0.08 1 <0.025 - 0.66 0.33 1 - 8.9 10.021 i - 0.31 40.7 i - 7151 0.9 i - 26.3 2.8 1 - 278 1.7 - 10.5 10.22 i - 5.8 0.17 1 - <0.5 97.7 - 223 1.8 - 33.3 0.02 i - <0.1 104 - 222 7.5 - 15.9 Sample ID Sample Analytical Results AL97 02/11/2015 1 <1 <5 <1 <100 <0.1 <10 <1 <1 <50 NA 6 4 <5 <5 130 6.93 <0.1 111 0.28 No All COIs are below comparative criteria AL97 08 03 2015 <0.5 1.4 <0.2 8 <0.08 <0.03 <0.5 <0.5 <50 NA 5.3 4.7 <0.5 <0.5 112 7 <0.1 102 <1 AL98 02 17 2015 <0.4 1.84 <0.11 <20 <0.06 <5 0.82 <0.03 <25 NA 6.43 3.95 0.6 <0.16 34 14 <0.06 173 0.25 N All I r below m r iv criteria AL99 02/12/2015 <1 <5 <1 <S00 <0.1 <10 <1 <1 <50 NA <5 <5 <5 <5 140 1.18 <0.1 73 6 No South and sidegradient of the Site. Chromium (VI) is not a COI associated with the Allen source areas. AL 7 2 1 < < <0.2 1 <5 <0.08 1 0.78 1 0.91 1 <0.5 1 <50 1 NA 10.5 1 < <0.5 1 <0.5 1 121 1 <2 1 <0.1 I ins 7.1 Notes: ' - Background threshold values were calculated using data from background groundwater samples collected June 2015 to September 2017. 2 - Background threshold values were calculated using data from background groundwater samples collected March 2011 to December 2018. Bold text - greatest comparative value O - bold highliqhted 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 high liqhted concentration indicates value is greater than greatest background threshold value where there is no regulatory standard, or background threshold values are greater than regulatory standard - highlighted concentration indicates value is either within range of background threshold values for constituents where there is no regulatory standard/background threshold values are greater than regulatory standard, or within range of background threshold value and the regulatory standard - high liqhted concentration indicates turbidity value is out of range ->10 Nephelometric Turbidity Units (NTUs)) or pH value was not measured. Results are deemed invalid. * - 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. NE - not established NA - not available mq/L - milligrams per liter pg/L - micrograms per liter Prepared by: LWD Checked by: JY1 Page 4 of 4 TABLE 6-10 NPDES PERMIT LIMITS AND ANTICIPATED GROUNDWATER REMEDIATION PARAMETER LEVELS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Geomean Concentrations by Flow Zone 1 Outfall 002 Effluent Limitations and Monitoring Requirements 0 CL y u 0 L Parameter c 'M . m o > �Q p M i Flow (MGD) NS NS/1.002 NA NA NA TSS 30.0 mg/L 50.0 mg/L 4.6 mg/L 4.0 mg/L 3.5 mg/L Oil & Grease 15.0 mg/L 20.0 mg/L NA NA NA 5-day BOD 30.0 mg/L 45.0 mg/L NA NA NA Fecal Coliform 200/100 mL 400/100 mL NA NA NA Total Silver 3.74 pg/L 15.13 pg/L 0.4 pg/L NA 0.3 pg/L Total Iron3 1.0 mg/L 1.0 mg/L 0.87 mg/L 0.19 mg/L 0.103 mg/L Total Copper3 1.0 mg/L 1.0 mg/L 0.001 mg/L 0.001 mg/L 0.001 mg/L Chronic Toxicity Note4 NA NA NA pH Between 6.0 and 9.0 S.U. 5.5 S.U. 7.2 S.U. 8.3 S.U. (+1.7/-1.9) (+4.2/-1.7) (+2.2/-1.9) Prepared by: VTV Checked by: LWD Notes: 1 - Downgradient groundwater monitoring wells; 2018 and Q1 2019 data z- 1 MGD limit applies only when dewatering 3 - Limits apply only when chemical metal cleaning wastewaters are being discharged. 4 - Whole effluent toxicity shall be monitored by chronic toxicity (Ceriodaphnia) Pass/Fail at 23.6% MGD - million gallons per day NS - not specified TSS - total suspended solids BOD - biological oxygen demand S.U. - standard units NA - not analyzed Page 1 of 1 TABLE 6-11 FEATURE IRRIGATION SYSTEM SETBACK CORRRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Feature Irrigation System Setback (feet) Spray Drip Private residence 400 100 Place of assembly owned by permittee 200 15 Surface waters 100 100 Property line 150 50 Prepared by: VTV Checked by: LWD Page 1 of 1 TABLE 6-12 REMEDIAL TECHNOLOGY SCREENING SUMMARY CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Summary of Remedial Technology Retain Technology for Further Screening Consideration Technology Yes/No Rationale COIs pose no unacceptable risk to human health Monitored Natural Attenuation (MNA) Yes or the environment under conservative exposure scenarios and could be implemented in conjunction with source control measures. In -Situ Technologies Low Permeability Barriers (LPB) No Feasible, but technically challenging and costly. Groundwater Flushing Yes Possible application to enhance capture of mobile COIs (e.g., boron). The area, depth and heterogeneity of geological Encapsulation No conditions requiring groundwater remediation are greater in size and complexity for uniform implementation of this technology. The area, depth, and heterogeneity of geological conditions requiring groundwater remediation Permeable Reactive Barrier (PRB) No are too large for feasible trenching. Injection of reagents through boreholes is possible; however, technology is not well established for boron. Groundwater Extraction Technologies Vertical Extraction Wells Yes Applicable for groundwater extraction of mobile COIs. Horizontal or Angular Extraction Wells No While potentially effective, vertical extraction wells are deemed more cost effective. Extraction Trenches No Saprolite is too thick for trenching to be effective. Hydraulic Fracturing No Not warranted based upon the limited extent of COIs in bedrock. Limited effectiveness as an extraction Phytoremediation No technology due to extraction rates and not feasible to reach to targeted depths (greater than 100 feet in some areas). Groundwater Treatment Technologies pH Adjustment Yes Retained for remedial alternatives that include clean water infiltration or extraction. Precipitation Yes Retained for remedial alternatives that include clean water infiltration or groundwater extraction. Page 1 of 1 TABLE 6-12 REMEDIAL TECHNOLOGY SCREENING SUMMARY CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Summary of Remedial Technology Retain Technology for Further Screening Consideration Technology Yes/No Rationale No feasible or economical method to dispose of the Ion Exchange No regeneration effluent and groundwater influent streams might have geochemical characteristics that interfere with other treatment technology. Pretreatment and a high volume of reject effluent that requires additional treatment prior to disposal Membrane Filtration No make this technology costly and high maintenance. Other treatment options to remove soluble metals from extracted groundwater are better suited for the Site. Could potentially serve as a means of Phytoremediation Yes groundwater treatment in specific areas where ash removal has occurred and for treatment of seeps. Management of Extracted Groundwater NPDES Permitted Discharge Yes Discharge to Outfall 002 or Outfall 006 Publicly Owned Treatment Works NO Would use much of available capacity and POTW (POTW) might not accept large volume of groundwater. Non -Discharge Permit --- --- Treatment prior to application could result in a • Infiltration Gallery No complicated system with significant operation and maintenance efforts. Treatment prior to application could result in a • Land Application No complicated system with significant operation and maintenance efforts. Beneficial Reuse --- --- • Fire Protection No Not feasible to store extracted groundwater for fire protection. Potential application and could be reconsidered • Non -Contact Cooling Water No in the future, but not recommended at this time. The need for dust suppression and truck wash water is limited and would not justify the effort • Dust Suppression and Truck Wash No and expense to substitute extracted groundwater for dust suppression and truck wash water. Prepared by: LWD Checked by: CIS Page 2 of 2 TABLE 6-13 ALTERNATIVE 3 GROUNDWATER EXTRACTION AND CLEAN WATER INFILTRATION WELL SUMMARY CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Groundwater Extraction Well System Horizontal and Vertical Wells Vertical Wells Only Extraction Well System Extraction Well System Number of Wells Flow Zone Total Depth Number of Wells Flow Zone Total Depth ft b s ft b s 14 Shallow/Deep 60-89 14 Shallow/Deep 60-89 36 Shallow/Deep 90-119 36 Shallow/Deep 90-119 19 Shallow/Deep 120-149 19 Shallow/Deep 120-149 18 Bedrock 190-400 18 Bedrock 190-400 Total Well Count: 87 Total Well Count: 87 System flow and operation assumptions: System flow and operation assumptions: Flow rate: Approximately 13 gpm per shallow/deep flow zone well and 4 gpm per bedrock Flow rate: Approximately 13 gpm per shallow/deep flow zone well and 4 gpm per bedrock well. Total system extraction flow rate of approximately 970 gpm. The groundwater extraction well. Total system extraction flow rate of approximately 970 gpm. The groundwater extraction rate is based on predictive flow and transport modeling, which assumes a 50 percent well rate is based on predictive flow and transport modeling, which assumes a 50 percent well efficiency. efficiency. Extraction wells operate to maintain water level near bottom of the well. Extraction wells operate to maintain water level near bottom of the well. Clean Water Infiltration Well System Clean Water Infiltration Well System Vertical Wells Vertical Wells Number of Wells Flow Zone Total Depth Number of Wells Flow Zone Total Depth ftbs ft b s 11 Shallow/Deep 60-89 36 Shallow/Deep 60-89 32 Shallow/Deep 90-119 35 Shallow/Deep 90-119 5 Shallow/Deep 120-149 5 Shallow/Deep 120-149 Total Well Count: 48 Total Well Count: 76 System flow and operation assumptions: System flow and operation assumptions: Flow rate: 5 gpm per well. Total system infiltration flow rate of approximately 230 gpm. The Flow rate: 5 gpm per well. Total system infiltration flow rate of approximately 380 gpm. The groundwater infiltration rate is based on predictive flow and transport modeling, which groundwater infiltration rate is based on predictive flow and transport modeling, which assumes a 25 percent well efficiency. assumes a 25 percent well efficiency. Clean water infiltration wells are assumed to operate with pressure head set to 4.3 to 6.5 psi. Clean water infiltration wells are assumed to operate with pressure head set to 4.3 to 6.5 psi. Horizontal Well Horizontal Well Number of Wells Flow Zone Total Depth ft b s Not Applicable 11 (258-470 feet long) Shallow 20 11 (255-470 feet long) Shallow 80 System flow and operation assumptions: Flow rate: Total infiltration flow rate of approximately 175 gpm. The groundwater infiltration rate is based on predictive flow and transport modeling, which assumes a 25 percent well efficiency. Iclean water infiltration wells operate with pressure head set to 4.3 to 6.5 psi. Notes: ft bgs - feet below ground surface gpm - gallons per minute psi - pounds per square inch Prepared by: LWD Checked by: JFE Page 1 of 1 TABLE 6-14 ENVIRONMENTAL SUSTAINABILITY COMPARISONS FOR REMEDIATION ALTERNATIVES CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT NC Remedial Alternative Remedial Alternative 1 - Groundwater Remediation by MNA Remedial Alternative 2 - Groundwater Remediation by Extraction Remedial Alternative 3 - Groundwater Remediation by Clean Water Infiltration and Extraction Emissions Units Horizontal and Vertical Wells Vertical Wells Only Horizontal and Vertical Wells Vertical Wells Only COz Emissions metric ton 4.57E+00 4.86E+05 4.78E+05 2.62E+04 2.96E+04 Onsite NO, emissions metric ton O.00E+00 9.06E+01 9.06E+01 1.14E+02 1.45E+02 Onsite SO„ Emissions metric ton O.00E+00 9.26E+00 9.26E+00 1.16E+01 1.48E+01 Onsite PM,o Emissions metric ton O.00E+00 8.16E+00 8.16E+00 1.03E+01 1.31 E+01 Total NO, emissions metric ton 1.69E-03 1.83E+03 1.80E+03 1.66E+02 1.97E+02 Total SO„ Emissions metric ton 5.96E-05 1.63E+03 1.60E+03 5.37E+01 5.46E+01 Total PM,o Emissions metric ton 3.43E-04 1.94E+02 1.90E+02 2.34E+01 3.10E+01 Total Energy Used MMBTU 5.75E+01 8.72E+06 8.65E+06 7.30E+06 7.34E+06 Total Emissions metric ton 4.58E+00 4.90E+05 4.81E+05 2.66E+04 3.00E+04 Notes: CO2 - Airborne emissions of carbon dioxide MMBTU - Million British Thermal Units NOx- Airborne emissions of nitrogen oxides (combination of nitrogen monoxide and nitrogen dioxide) 50„-Airborne emissions of sulfur oxides (combination of sulfur monoxide, sulfur dioxide, sulfur trioxide, and others) PM,o - Airborne emissions of particulate matter that is 10 micrometers or less in diameter Prepared by: GTC Checked by: CBC Revised by: LWD Page 1 of 1 TABLE 6-15 MODELED CLEAN WATER INFILTRATION WELL DETAILS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Horizontal and Vertical Wells Vertical Wells Only Well ID Fasting (NAD 88) Northing (NAD 88) Approximate Ground Surface Elevation (feet) Pressure at Well Head (ft of Head Above Ground Surface) Well Depth (ft BGS) Targeted Flow Zones Total Simulated Flow (gpm) Well ID Easting (NAD 88) Northing (NAD 88) Approximate Ground Surface Elevation (feet) Pressure at Well Head (ft of Head Above Ground Surface) Well Depth (ft BGS) Targeted Flow Zones Total Simulated Flow (gpm) Vertical Injection Wells Vertical Injection Wells IW-01 1398745.70 529382.00 635 4.3 131 Saprolite and Transition Zone 8.9 IW-01 1398745.70 529382.00 635 4.3 131 Saprolite and Transition Zone 5 IW-02 1398864.10 529456.50 616 4.3 133 Saprolite and Transition Zone 9 IW-02 1398864.10 529456.50 616 4.3 133 Saprolite and Transition Zone 5 IW-03 1399030.30 529464.10 597 4.3 138 Saprolite and Transition Zone 5 IW-03 1399030.30 529464.10 597 4.3 138 Saprolite and Transition Zone 5 IW-04 1399588.00 530230.00 588 4.3 104 Saprolite and Transition Zone 4 IW-04 1399588.00 530230.00 588 4.3 104 Saprolite and Transition Zone 5 IW-05 1399517.30 530222.40 588 4.3 102 Saprolite and Transition Zone 3 IW-05 1399517.30 530222.40 588 4.3 102 Saprolite and Transition Zone 5 IW-06 1399439.00 530124.90 588 4.3 103 Saprolite and Transition Zone 3 IW-06 1399439.00 530124.90 588 4.3 103 Saprolite and Transition Zone 5 IW-07 1399160.20 529937.80 588 4.3 94 Saprolite and Transition Zone 4 IW-07 1399160.20 529937.80 588 4.3 94 Saprolite and Transition Zone 5 IW-08 1399238.50 529956.90 588 4.3 99 Saprolite and Transition Zone 3 IW-08 1399238.50 529956.90 588 4.3 99 Saprolite and Transition Zone 5 IW-09 1399364.50 529998.90 588 4.3 104 Saprolite and Transition Zone 3 IW-09 1399364.50 529998.90 588 4.3 104 Saprolite and Transition Zone 5 IW-10 1399444.70 530037.10 588 4.3 107 Saprolite and Transition Zone 3 IW-10 1399444.70 530037.10 588 4.3 107 Saprolite and Transition Zone 5 IW-11 1399555.50 530035.20 588 4.3 109 Saprolite and Transition Zone 3 IW-11 1399555.50 530035.20 588 4.3 109 Saprolite and Transition Zone 5 IW-12 1399631.90 530037.10 588 4.3 111 Saprolite and Transition Zone 3 IW-12 1399631.90 530037.10 588 4.3 111 Saprolite and Transition Zone 5 IW-13 1399120.10 529769.70 588 4.3 99 Saprolite and Transition Zone 4 IW-13 1399120.10 529769.70 588 4.3 99 Saprolite and Transition Zone 5 IW-14 1399280.50 529857.60 588 4.3 98 Saprolite and Transition Zone 3 IW-14 1399280.50 529857.60 588 4.3 98 Saprolite and Transition Zone 5 IW-15 1399482.90 529939.70 588 4.3 107 Saprolite and Transition Zone 3 IW-15 1399482.90 529939.70 588 4.3 107 Saprolite and Transition Zone 5 IW-16 1399660.60 529956.90 588 4.3 112 Saprolite and Transition Zone 3 IW-16 1399660.60 529956.90 588 4.3 112 Saprolite and Transition Zone 5 IW-17 1399118.10 529609.30 587 4.3 118 Saprolite and Transition Zone 4 IW-17 1399118.10 529609.30 587 4.3 118 Saprolite and Transition Zone 5 IW-18 1399244.20 529697.10 588 4.3 100 Saprolite and Transition Zone 4 IW-18 1399244.20 529697.10 588 4.3 100 Saprolite and Transition Zone 5 IW-19 1399364.50 529764.00 588 4.3 90 Saprolite and Transition Zone 3 IW-19 1399364.50 529764.00 588 4.3 90 Saprolite and Transition Zone 5 IW-20 1399555.50 529771.60 588 4.3 85 Saprolite and Transition Zone 3 IW-20 1399555.50 529771.60 588 4.3 85 Saprolite and Transition Zone 5 IW-21 1399630.00 529849.90 588 4.3 101 Saprolite and Transition Zone 3 IW-21 1399630.00 529849.90 588 4.3 101 Saprolite and Transition Zone 5 IW-22 1399706.40 529851.80 588 4.3 105 Saprolite and Transition Zone 3 IW-22 1399706.40 529851.80 588 4.3 105 Saprolite and Transition Zone 5 IW-23 1399782.80 529846.10 588 4.3 108 Saprolite and Transition Zone 3 IW-23 1399782.80 529846.10 588 4.3 108 Saprolite and Transition Zone 5 IW-24 1399116.20 529382.00 598 4.3 129 Saprolite and Transition Zone 6 IW-24 1399116.20 529382.00 598 4.3 129 Saprolite and Transition Zone 5 IW-25 1399118.10 529452.70 593 4.3 129 Saprolite and Transition Zone 5 IW-25 1399118.10 529452.70 593 4.3 129 Saprolite and Transition Zone 5 IW-26 1399360.70 529615.00 589 4.3 88 Saprolite and Transition Zone 5 IW-26 1399360.70 529615.00 589 4.3 88 Saprolite and Transition Zone 5 IW-27 1399740.80 529773.50 588 4.3 96 Saprolite and Transition Zone 4 IW-27 1399740.80 529773.50 588 4.3 96 Saprolite and Transition Zone 5 IW-28 1 1399817.20 529765.90 588 4.3 99 1 Saprolite and Transition Zone 4 IW-28 1399817.20 529765.90 588 4.3 99 Saprolite and Transition Zone 5 IW-29 1399819.10 529693.30 588 4.3 90 Saprolite and Transition Zone 5 IW-29 1399819.10 529693.30 588 4.3 90 Saprolite and Transition Zone 5 IW-30 1399931.80 529678.00 588 4.3 94 Saprolite and Transition Zone 4 IW-30 1399931.80 529678.00 588 4.3 94 Saprolite and Transition Zone 5 IW-31 1399973.80 529773.50 588 4.3 106 Saprolite and Transition Zone 4 IW-31 1399973.80 529773.50 588 4.3 106 Saprolite and Transition Zone 5 IW-32 1400012.00 529943.50 588 4.3 119 Saprolite and Transition Zone 6 IW-32 1400012.00 529943.50 588 4.3 119 Saprolite and Transition Zone 5 IW-33 1400099.80 529773.50 588 4.3 110 Saprolite and Transition Zone 5 IW-33 1400099.80 529773.50 588 4.3 110 Saprolite and Transition Zone 5 IW-34 1400052.10 529687.60 588 4.3 99 Saprolite and Transition Zone 4 IW-34 1400052.10 529687.60 588 4.3 99 Saprolite and Transition Zone 5 IW-35 1400145.70 529679.90 588 4.3 103 Saprolite and Transition Zone 4 IW-35 1400145.70 529679.90 588 4.3 103 Saprolite and Transition Zone 5 IW-36 1399324.40 529366.70 593 4.3 96 Saprolite and Transition Zone 7 IW-36 1399324.40 529366.70 593 4.3 96 Saprolite and Transition Zone 5 IW-37 1399439.00 529435.50 590 4.3 86 Saprolite and Transition Zone 7 IW-37 1399439.00 529435.50 590 4.3 86 Saprolite and Transition Zone 5 IW-38 1399486.80 529387.70 590 4.3 82 Saprolite and Transition Zone 7 IW-38 1399486.80 529387.70 590 4.3 82 Saprolite and Transition Zone 5 IW-39 1399555.50 529443.10 589 4.3 78 Saprolite and Transition Zone 6 IW-39 1399555.50 529443.10 589 4.3 78 Saprolite and Transition Zone 5 IW-40 1399593.70 529469.90 589 4.3 77 Saprolite and Transition Zone 6 IW-40 1399593.70 529469.90 589 4.3 77 Saprolite and Transition Zone 5 IW-41 1399740.80 529517.60 588 4.3 77 Saprolite and Transition Zone 6 IW-41 1399740.80 529517.60 588 4.3 77 Saprolite and Transition Zone 5 IW-42 1399855.40 529552.00 588 4.3 77 Saprolite and Transition Zone 6 IW-42 1399855.40 529552.00 588 4.3 77 Saprolite and Transition Zone 5 IW-43 1399970.00 529597.80 588 4.3 86 Saprolite and Transition Zone 5 IW-43 1399970.00 529597.80 588 4.3 86 Saprolite and Transition Zone 5 IW-44 1400097.90 529622.60 588 4.3 91 Saprolite and Transition Zone 4 IW-44 1400097.90 529622.60 588 4.3 91 Saprolite and Transition Zone 5 IW-45 1400189.60 529601.60 588 4.3 94 Saprolite and Transition Zone 4 IW-45 1400189.60 529601.60 588 4.3 94 Sa rolite and Transition Zone 5 Page 1 of 2 TABLE 6-15 MODELED CLEAN WATER INFILTRATION WELL DETAILS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Horizontal and Vertical Wells Vertical Wells Only Well ID Fasting (NAD 88) Northing (NAD 88) Approximate Ground Surface Elevation (feet) Pressure at Well Head (ft of Head Above Ground Surface) Well Depth (ft BGS) Targeted Flow Zones Total Simulated Flow (gpm) Well ID Easting (NAD 88) Northing (NAD 88) Approximate Ground Surface Elevation (feet) Pressure at Well Head (ft of Head Above Ground Surface) Well Depth (ft BGS) Targeted Flow Zones Total Simulated Flow (gpm) IW-46 1400287.00 529609.30 588 4.3 101 Saprolite and Transition Zone 5 IW-46 1400287.00 529609.30 588 4.3 101 Saprolite and Transition Zone 5 IW-47 1400097.90 529536.70 588 4.3 79 Saprolite and Transition Zone 4 IW-47 1400097.90 529536.70 588 4.3 79 Saprolite and Transition Zone 5 IW-48 1400399.70 529372.40 585 4.3 75 Saprolite and Transition Zone 5.5 IW-48 1399446.70 529179.50 599 4.3 93 Saprolite and Transition Zone 5 Horizontal Injection Wells IW-49 1399561.20 529229.20 596 4.3 87 Saprolite and Transition Zone 5 HZ-1 NA NA NA 4.3 20 Saprolite 6.9 IW-50 1399668.20 529246.40 595 4.3 84 Saprolite and Transition Zone 5 HZ-2 NA NA NA 4.3 20 Saprolite 8 IW-51 1399779.00 529305.60 592 4.3 79 Saprolite and Transition Zone 5 HZ-3 NA NA NA 4.3 20 Saprolite 6 IW-52 1399891.70 529322.80 590 4.3 77 Saprolite and Transition Zone 5 HZ-4 NA NA NA 4.3 20 Saprolite 7 IW-53 1399970.00 529378.20 589 4.3 74 Saprolite and Transition Zone 5 HZ-5 NA NA NA 4.3 20 Saprolite 6 IW-54 1400094.10 529393.50 588 4.3 72 Saprolite and Transition Zone 5 HZ-6 NA NA NA 4.3 20 Saprolite 6 IW-55 1400191.50 529458.40 588 4.3 77 Saprolite and Transition Zone 5 HZ-7 NA NA NA 4.3 20 Saprolite 7 IW-56 1400292.70 529456.50 587 4.3 80 Saprolite and Transition Zone 5 HZ-8 NA NA NA 4.3 20 Saprolite 7 IW-57 1399630.00 529103.20 597 4.3 91 Saprolite and Transition Zone 5 HZ-9 NA NA NA 4.3 20 Saprolite 6 IW-58 1399700.70 529179.50 594 4.3 85 Saprolite and Transition Zone 5 HZ-10 NA NA NA 4.3 20 Saprolite 7 IW-59 1399817.20 529173.80 592 4.3 81 Saprolite and Transition Zone 5 HZ-11 NA NA NA 4.3 20 Saprolite 8 IW-60 1399887.80 529244.50 591 4.3 79 Saprolite and Transition Zone 5 HZ-12 NA NA NA 4.3 80 Saprolite 8 IW-61 1399929.90 529168.10 590 4.3 81 Saprolite and Transition Zone 5 HZ-13 NA NA NA 4.3 80 Saprolite 9 IW-62 1400008.20 529244.50 589 4.3 79 Saprolite and Transition Zone 5 HZ-14 NA NA NA 4.3 80 Saprolite 7 IW-63 1400050.20 529313.20 588 4.3 75 Saprolite and Transition Zone 5 HZ-15 NA NA NA 4.3 80 Saprolite 8 IW-64 1400145.70 529242.60 588 4.3 77 Saprolite and Transition Zone 5 HZ-16 NA NA NA 4.3 80 Saprolite 7 IW-65 1400187.70 529313.20 587 4.3 73 Saprolite and Transition Zone 5 HZ-17 NA NA NA 4.3 80 Saprolite 6 IW-66 1400283.20 529378.20 587 4.3 72 Saprolite and Transition Zone 5 HZ-18 NA NA NA 4.3 80 Saprolite 7 IW-67 1400399.70 529372.40 585 4.3 75 Saprolite and Transition Zone 5 HZ-19 NA NA NA 4.3 80 Saprolite 7 IW-68 1399714.00 529047.80 593 4.3 90 Saprolite and Transition Zone 5 HZ-20 NA NA NA 4.3 80 Saprolite 7 IW-69 1399815.30 529049.70 592 4.3 88 Saprolite and Transition Zone 5 HZ-21 I NA NA I NA 1 4.3 1 80 1 Saprolite 8 IW-70 1399929.90 529043.90 590 4.3 89 Saprolite and Transition Zone 5 HZ-22 I NA NA I NA 4.3 80 Saprolite 9.2 IW-71 1400055.90 529055.40 589 4.3 86 Saprolite and Transition Zone 5 Notes: All depths are approximated and may change depending on site conditions. Flowrates are approximate and may change depending on site conditions. DTW - depth to water ft - feet ft BGS - feet below ground surface gpm - gallons per minute NA - Not applicable Prepared by: ]FE Checked by: LWD Page 2 of 2 TABLE 6-16 MODELED GROUNDWATER EXTRACTION WELL DETAILS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Horizontal and Vertical Wells Vertical Wells Only Well ID Fasting (NAD 88) Northing (NAD 88) Approximate Ground Surface Elevation (feet) Operational Water Elevation Maintained In Well feet Well Depth (ft BGS) Targeted Flow Zones Total Simulated Flow (gpm) Well ID Fasting (NAD 88) Northing (NAD 88) Approximate Ground Surface Elevation (feet) Operational Water Elevation Maintained In Well feet Well Depth (ft BGS) Targeted Flow Zones Total Simulated Flow (gpm) Vertical Extraction Wells Vertical Extraction Wells EX-1 1400563.10 529767.50 572 464 118 Saprolite and Transition Zone 13 EX-1 1400563.10 529767.50 572 464 118 Saprolite and Transition Zone 13 EX-2 1400681.00 529601.80 572 464 118 Saprolite and Transition Zone 13 EX-2 1400681.00 529601.80 572 464 118 Saprolite and Transition Zone 13 EX-3 1400690.73 529449.88 574 466 118 Saprolite and Transition Zone 13 EX-3 1400690.73 529449.88 574 466 118 Saprolite and Transition Zone 13 EX-4 1400682.89 529309.70 574 477 107 Saprolite and Transition Zone 13 EX-4 1400682.89 529309.70 574 477 107 Saprolite and Transition Zone 13 EX-5 1400623.09 529177.36 578 511 77 Saprolite and Transition Zone 13 EX-5 1400623.09 529177.36 578 511 77 Saprolite and Transition Zone 13 EX-6 1400614.10 528977.10 583 496 97 Saprolite and Transition Zone 13 EX-6 1400614.10 528977.10 583 496 97 Saprolite and Transition Zone 13 EX-7 1400617.90 528812.90 583 487 106 Saprolite and Transition Zone 13 EX-7 1400617.90 528812.90 583 487 106 Saprolite and Transition Zone 13 EX-8 1400616.60 528657.50 583 490 103 Saprolite and Transition Zone 13 EX-8 1400616.60 528657.50 583 490 103 Saprolite and Transition Zone 13 EX-9 1399970.40 529472.80 588 515 83 Saprolite and Transition Zone 13 EX-9 1399970.40 529472.80 588 515 83 Saprolite and Transition Zone 13 EX-10 1399854.40 529437.00 588 515 83 Saprolite and Transition Zone 13 EX-10 1399854.40 529437.00 588 515 83 Saprolite and Transition Zone 13 EX-11 1399739.30 529392.60 590 513 87 Saprolite and Transition Zone 13 EX-11 1399739.30 529392.60 590 513 87 Saprolite and Transition Zone 13 EX-12 1399633.70 529360.60 590 512 88 Saprolite and Transition Zone 13 EX-12 1399633.70 529360.60 590 512 88 Saprolite and Transition Zone 13 EX-13 1399522.40 529321.90 592 509 93 Saprolite and Transition Zone 13 EX-13 1399522.40 529321.90 592 509 93 1 Saprolite and Transition Zone 13 EX-14 1 1399402.60 529296.40 594 504 100 Saprolite and Transition Zone 13 EX-14 1399402.60 529296.40 594 504 100 Saprolite and Transition Zone 13 EX-15 1399238.98 529228.85 607 492 125 Saprolite and Transition Zone 13 EX-15 1399238.98 529228.85 607 492 125 Saprolite and Transition Zone 13 EX-16 1399324.92 529164.85 611 502 119 Saprolite and Transition Zone 13 EX-16 1399324.92 529164.85 611 502 119 Saprolite and Transition Zone 13 EX-17 1399447.42 529040.52 601 507 104 Saprolite and Transition Zone 13 EX-17 1399447.42 529040.52 601 507 104 Saprolite and Transition Zone 13 EX-18 1399558.96 528925.33 599 505 104 Saprolite and Transition Zone 13 EX-18 1399558.96 528925.33 599 505 104 Saprolite and Transition Zone 13 EX-19 1399633.92 528808.31 598 497 111 Saprolite and Transition Zone 13 EX-19 1 1399633.92 528808.31 598 497 111 Saprolite and Transition Zone 13 EX-20 1 1399708.89 528705.91 595 490 115 Saprolite and Transition Zone 13 EX-20 1399708.89 528705.91 595 490 115 Saprolite and Transition Zone 13 EX-21 1399739.97 528607.18 599 487 122 Saprolite and Transition Zone 13 EX-21 1399739.97 528607.18 599 487 122 Saprolite and Transition Zone 13 EX-22 1399930.90 528607.60 596 480 126 Saprolite and Transition Zone 13 EX-22 1399930.90 528607.60 596 480 126 Saprolite and Transition Zone 13 EX-23 1400053.50 528599.90 595 477 128 Saprolite and Transition Zone 13 EX-23 1400053.50 528599.90 595 477 128 Saprolite and Transition Zone 13 EX-24 1400145.50 528599.20 593 476 127 Saprolite and Transition Zone 13 EX-24 1400145.50 528599.20 593 476 127 Saprolite and Transition Zone 13 EX-25 1400240.40 528602.80 590 475 125 Saprolite and Transition Zone 13 EX-25 1 1400240.40 528602.80 590 475 125 Saprolite and Transition Zone 13 EX-26 1 1400340.40 528602.80 589 477 122 Saprolite and Transition Zone 13 EX-26 1400340.40 528602.80 589 477 122 Saprolite and Transition Zone 13 EX-27 1400446.90 528602.80 588 478 120 Saprolite and Transition Zone 13 EX-27 1400446.90 528602.80 588 478 120 Saprolite and Transition Zone 13 EX-28 1400624.20 528462.00 583 478 115 Saprolite and Transition Zone 13 EX-28 1400624.20 528462.00 583 478 115 Saprolite and Transition Zone 13 EX-29 1400621.50 528250.40 584 481 113 Saprolite and Transition Zone 13 EX-29 1400621.50 528250.40 584 481 113 Saprolite and Transition Zone 13 EX-30 1400627.00 528077.20 584 481 113 Saprolite and Transition Zone 13 EX-30 1400627.00 528077.20 584 481 113 Saprolite and Transition Zone 13 EX-31 1400627.00 527898.50 582 479 113 Saprolite and Transition Zone 13 EX-31 1400627.00 527898.50 582 479 113 Saprolite and Transition Zone 13 EX-32 1 1400624.20 527766.50 583 483 110 Saprolite and Transition Zone 13 EX-32 1400624.20 527766.50 583 483 110 Saprolite and Transition Zone 13 EX-33 1400624.13 527621.81 582 490 102 Saprolite and Transition Zone 13 EX-33 1400624.13 527621.81 582 490 102 Saprolite and Transition Zone 13 EX-34 1400618.50 527501.30 581 488 103 Saprolite and Transition Zone 13 EX-34 1400618.50 527501.30 581 488 103 Saprolite and Transition Zone 13 EX-35 1400621.17 527425.57 581 485 106 Saprolite and Transition Zone 13 EX-35 1400621.17 527425.57 581 485 106 Saprolite and Transition Zone 13 EX-36 1400627.00 527191.90 581 474 117 Saprolite and Transition Zone 13 EX-36 1400627.00 527191.90 581 474 117 Saprolite and Transition Zone 13 EX-37 1400566.50 527007.70 582 477 115 Saprolite and Transition Zone 13 EX-37 1400566.50 527007.70 582 477 115 Saprolite and Transition Zone 13 EX-38 1 1400508.70 526826.30 585 482 113 Saprolite and Transition Zone 13 EX-38 1400508.70 526826.30 585 482 113 Saprolite and Transition Zone 13 EX-39 1400500.50 526683.30 583 481 112 Saprolite and Transition Zone 13 EX-39 1 1400500.50 526683.30 583 481 112 Saprolite and Transition Zone 13 EX-40 1400508.70 526471.70 583 472 121 Saprolite and Transition Zone 13 EX-40 1400508.70 526471.70 583 472 121 Saprolite and Transition Zone 13 EX-41 1400505.30 526299.00 581 456 135 Saprolite and Transition Zone 13 EX-41 1400505.30 526299.00 581 456 135 Saprolite and Transition Zone 13 EX-42 1400507.30 526103.90 578 449 139 Saprolite and Transition Zone 13 EX-42 1400507.30 526103.90 578 449 139 Saprolite and Transition Zone 13 EX-43 1400507.30 525897.00 575 481 104 Saprolite and Transition Zone 13 EX-43 1400507.30 525897.00 575 481 104 Saprolite and Transition Zone 13 EX-44 1400454.10 525739.30 588 508 90 Saprolite and Transition Zone 13 EX-44 1400454.10 525739.30 588 508 90 Saprolite and Transition Zone 13 EX-45 1400454.10 525552.00 589 526 73 Saprolite and Transition Zone 13 EX-45 1 1400454.10 525552.00 589 526 73 Saprolite and Transition Zone 13 EX-46 1400508.60 525466.20 580 523 67 Saprolite and Transition Zone 13 EX-46 1400508.60 525466.20 580 523 67 Saprolite and Transition Zone 13 EX-47 1400508.60 525340.40 588 521 77 Saprolite and Transition Zone 13 EX-47 1400508.60 525340.40 588 521 77 Saprolite and Transition Zone 13 EX-48 1400560.10 525300.40 579 515 74 Saprolite and Transition Zone 13 EX-48 1400560.10 525300.40 579 515 74 Saprolite and Transition Zone 13 EX-49 1400508.60 525203.90 593 514 89 Saprolite and Transition Zone 13 EX-49 1400508.60 525203.90 593 514 89 Saprolite and Transition Zone 13 EX-50 1400567.20 525217.20 588 511 87 Saprolite and Transition Zone 13 EX-50 1400567.20 525217.20 588 511 87 Saprolite and Transition Zone 13 EX-51 1400619.10 525168.90 577 501 86 Saprolite and Transition Zone 13 EX-5 1 1400619.10 525168.90 577 501 86 Saprolite and Transition Zone 13 EX-52 1400514.00 525075.50 586 499 97 Saprolite and Transition Zone 13 EX-52 1400514.00 525075.50 586 499 97 Saprolite and Transition Zone 13 EX-53 1400627.00 525080.00 583 492 101 Saprolite and Transition Zone 13 EX-53 1400627.00 525080.00 583 492 101 Saprolite and Transition Zone 13 EX-54 1400631.20 524996.70 577 481 106 Saprolite and Transition Zone 13 EX-54 1400631.20 524996.70 577 481 106 Saprolite and Transition Zone 13 Page 1 of 2 TABLE 6-16 MODELED GROUNDWATER EXTRACTION WELL DETAILS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Horizontal and Vertical Wells Vertical Wells Only Well ID Fasting (NAD 88) Northing (NAD 88) Approximate Ground Surface Elevation (feet) Operational Water Elevation Maintained In Well feet Well Depth (ft BGS) Targeted Flow Zones Total Simulated Flow (gpm) Well ID Fasting (NAD 88) Northing (NAD 88) Approximate Ground Surface Elevation (feet) Operational Water Elevation Maintained In Well feet Well Depth (ft BGS) Targeted Flow Zones Total Simulated Flow (gpm) Vertical Extraction Wells Vertical Extraction Wells EX-55 1400548.80 524947.00 575 481 104 Saprolite and Transition Zone 13 EX-55 1400548.80 524947.00 575 481 104 Saprolite and Transition Zone 13 EX-56 1400554.10 524810.50 575 458 127 Saprolite and Transition Zone 13 EX-56 1400554.10 524810.50 575 458 127 Saprolite and Transition Zone 13 EX-57 1400508.60 524679.40 575 437 148 Saprolite and Transition Zone 13 EX-57 1400508.60 524679.40 575 437 148 Saprolite and Transition Zone 13 EX-58 1400508.60 525466.20 580 255 335 Bedrock 4 EX-58 1400508.60 525466.20 580 255 335 Bedrock 4 EX-59 1400508.60 525340.40 588 255 343 Bedrock 4 EX-59 1400508.60 525340.40 588 255 343 Bedrock 4 EX-60 1400560.10 525300.40 579 395 194 Bedrock 4 EX-60 1400560.10 525300.40 579 395 194 Bedrock 4 EX-61 1400508.60 525203.90 593 255 348 Bedrock 4 EX-61 1400508.60 525203.90 593 255 348 Bedrock 4 EX-62 1400567.20 525217.20 588 390 208 Bedrock 4 EX-62 1400567.20 525217.20 588 390 208 Bedrock 4 EX-63 1400619.10 525168.90 577 380 207 Bedrock 4 EX-63 1400619.10 525168.90 577 380 207 Bedrock 4 EX-64 1400514.00 525075.50 586 240 356 Bedrock 4 EX-64 1400514.00 525075.50 586 240 356 Bedrock 4 EX-65 1400627.00 525080.00 583 370 223 Bedrock 4 EX-65 1400627.00 525080.00 583 370 223 Bedrock 4 EX-66 1400631.20 524996.70 577 360 227 Bedrock 4 EX-66 1400631.20 524996.70 577 360 227 Bedrock 4 EX-67 1400548.80 524947.00 575 220 365 Bedrock 4 EX-67 1400548.80 524947.00 575 220 365 Bedrock 4 EX-68 1400554.10 524810.50 575 205 380 Bedrock 4 EX-68 1400554.10 524810.50 575 205 380 Bedrock 4 EX-69 1400508.60 524679.40 575 190 395 Bedrock 4 EX-69 1400508.60 524679.40 575 190 395 Bedrock 4 EX-70 1399285.30 529454.70 592 487 115 Saprolite and Transition Zone 13 EX-70 1399285.30 529454.70 592 487 115 Saprolite and Transition Zone 13 EX-71 1399408.30 529497.80 590 502 98 Saprolite and Transition Zone 13 EX-71 1399408.30 529497.80 590 502 98 Saprolite and Transition Zone 13 EX-72 1399520.00 529533.40 590 512 88 Saprolite and Transition Zone 13 EX-72 1399520.00 529533.40 590 512 88 Saprolite and Transition Zone 13 EX-73 1399630.40 529559.20 588 512 86 Saprolite and Transition Zone 13 EX-73 1399630.40 529559.20 588 512 86 Saprolite and Transition Zone 13 EX-74 1 1399779.90 529609.40 588 506 92 Saprolite and Transition Zone 13 EX-74 1399779.90 529609.40 588 506 92 Saprolite and Transition Zone 13 EX-75 1399893.23 529640.77 588 501 97 Saprolite and Transition Zone 13 EX-75 1399893.23 529640.77 588 501 97 Saprolite and Transition Zone 13 EX-76 1400337.60 529856.70 583 466 127 Saprolite and Transition Zone 13 EX-76 1400337.60 529856.70 583 466 127 Saprolite and Transition Zone 13 EX-77 1400238.40 529947.50 586 466 130 Saprolite and Transition Zone 13 EX-77 1400238.40 529947.50 586 466 130 Saprolite and Transition Zone 13 EX-78 1400191.90 530032.00 586 467 129 Saprolite and Transition Zone 13 EX-78 1400191.90 530032.00 586 467 129 Saprolite and Transition Zone 13 EX-79 1400145.40 530120.70 587 468 129 Saprolite and Transition Zone 13 EX-79 1400145.40 530120.70 587 468 129 Saprolite and Transition Zone 13 EX-80 1 1400101.10 530217.90 587 469 128 Saprolite and Transition Zone 13 EX-80 1400101.10 530217.90 587 469 128 Saprolite and Transition Zone 13 EX-81 1400054.60 530332.00 588 471 127 Saprolite and Transition Zone 13 EX-81 1400054.60 530332.00 588 471 127 Saprolite and Transition Zone 13 EX-82 1399739.30 529392.60 594 380 224 Bedrock 4 EX-82 1399739.30 529392.60 594 380 224 Bedrock 4 EX-83 1399633.70 529360.60 592 387 215 Bedrock 4 EX-83 1399633.70 529360.60 592 387 215 Bedrock 4 EX-84 1399522.40 529321.90 590 390 210 Bedrock 4 EX-84 1399522.40 529321.90 590 390 210 Bedrock 4 EX-85 1399402.60 529296.40 590 392 208 Bedrock 4 EX-85 1399402.60 529296.40 590 392 208 Bedrock 4 EX-86 1399854.80 529435.40 588 393 205 Bedrock 4 EX-86 1399854.80 529435.40 588 393 205 Bedrock 4 EX-87 1399969.80 1 529473.30 1 588 1 396 1 202 1 Bedrock 1 4 EX-87 1 1399969.80 1 529473.30 1 588 1 396 1 202 1 Bedrock 4 Notes: All depths are approximated and may change depending on site conditions. Flowrates are approximate and may change depending on site conditions. DTW - depth to water ft - feet ft BGS - feet below ground surface gpm - gallons per minute NA - Not applicable Prepared by: JFE Checked by: LWD Page 2 of 2 M- u ' E W a ° d rnLL c a E m c Y 0 o. 0 a c m 3 d C E m rn 0 A: . m c 0 .E 0 F TABLE 6-17 EFFECTIVENESS MONITORING PLAN ELEMENTS CORRECTIVE ACTION PLAN UPDATE ALLEN STEAM STATION DUKE ENERGY CAROLINAS, LLC, BELMONT, NC Effectiveness Monitoring Plan (EMP) Post -Closure Monitoring Plan (POMP) Implemented 30 days after CAP Approval Implemented after completion of ash basin closure activities EMP Groundwater Well Monitoring Network (background, downgradient of source areas) AB-9S CCR-26BR GWA-5D AB-91D CCR-BG-1S3 GWA-5BRA AB-10S CCR-BG-IDA1 GWA-SBRL AB-IOD CP-1S GWA-6S AB-10BR CP-1D GWA-6DA AB-IOBRL CP-2S GWA-6BRA BG-1S1 CP-2D GWA-6BRL BG-1DA1 CP-3S GWA-7S BG-1BR3 CP-3D GWA-7D CCR-3S CP-4S GWA-21S3 CCR-3DA CP-4D GWA-21DA3 CCR-16S CP-5S GWA-21BR3 CCR-16D CP-5D GWA-27S CCR-16BR CP-6S GWA-27D CCR-18S CP-6D GWA-28S CCR-18D CP-6BR GWA-28D CCR-20S EX-816 GWA-28BR CCR-20D GWA-3S GWA-29S CCR-21S GWA-3D GWA-29D CCR-21D GWA-3BRA GWA-29BR CCR-26S GWA-3BRL GWA-30S CCR-26D GWA-5S GWA-30D EMP Groundwater Quality', (Semi -Annual Sampling Frequency) Alkalinity Ferrous Iron Sodium Aluminum Iron Strontium Bicarbonate Alkalinity Magnesium Sulfate Boron Manganese Total Dissolved Solids2 Calcium Nitrate + Nitrite Total Organic Carbon Cobalt Potassium PCMP Groundwater Quality (Sampling frequency to be determined) Parameters and sampling frequency to be included in the PCMP in accordance with G.S. 130A-309.214(a)(4)k.2 when submitted. CMP and PCMP Groundwater Field Parameters Water Level Specific Conductivity Temperature PH Oxidation Reduction Potential Dissolved Oxygen EMP Review 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 Performance 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 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 confirmin COIs are below applicable Standards at or beyond the compliance boundary, at which time a request for completion of active remediatio will be filed with NCDEQ. If applicable standards are not met, the EMP will continue and transition to post -closure monitoring if necessary. PCMP Review Annual 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 02L compliance 4) Recommend plan adjustments, if applicable At a frequency no greater than 5 years: 1) Update background analysis 2) Confirm Risk Assessment assumptions remain valid 3) Verify model results, update if needed After ash basin closure and following ash basin closure certification, a PCMP will be implemented at the Site for a minimum of 30 years in accordance with G. S. 130A-309.214(4)(k)(2). Early termination: If groundwater monitoring results are below applicable Standards at the compliance boundary for three years, Duke Energy will request completion of corrective action in accordance with G.S. 130A- 309.214(a)(3)b. If groundwater monitoring results are above applicable Standards, the PCMP will continue. 1 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 monitoring wells and parameters may be adjusted based on additional data and the effects of corrective action. 4 Groundwater standards may be modified over time in accordance with 02L .0106(k) 3 Proposed extraction well to be installed as part of the remedial alternative Italicized parameters - parameters for general water quality to evaluate monitoring data quality Wells indicated in red will have geochemical sondes placed to monitor geochemical conditions