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Home My WebLink AboutNC0038377_Mayo Tables_20160701TABLE 1-1 WELL CONSTRUCTION DATA MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC IDENTIFICATION PROGRAM DATE INSTALLED MONITORING ZONE MATERIAL DIAMETER (INCHES) NORTHING (FEET) EASTING (FEET) MEASURING POINT TOC ELEVATION (Feet- MSL) GROUND SURFACE ELEVATION (FEET- MSL) BORING 3 DEPTH z' (FEET BGS) SURFACE 3 CASING DEPTH (FEET BGS) TOTAL WELL DEPTH z' (FEET BGS) MEASURED WDEPTH' i (FEET C) FEET TO SCREENED INTERVAL 3 (FEET BGS) TOP OF SCREEN ELEVATION (FEET- MSL) BOTTOM OF SCREEN ELEVATION (FEET- MSL) Ash Basin ABMW-1 CAMA 6/2/2015 Ash PVC 2.00 1012988.38 2029253.96 483.81 481.11 13.3 NA 13.3 15.65 2.8 13.3 478.31 467.81 ABMW-2 CAMA 5/31/2015 Ash PVC 2.00 1012778.26 2030477.81 493.90 490.68 41.5 NA 39.2 42.48 34.0 39.2 456.68 451.48 ABMW-2BR CAMA 6/3/2015 Bedrock PVC 2.00 1012781.97 2030476.42 493.85 490.65 130.0 0-41.0 106.0 107.64 94.0 104.0 396.65 386.65 ABMW-2BRL CAMA/DATA GAP 1/12/2016 Bedrock PVC 2.00 1012774.00 2030465.00 493.97 491.05 180.0 0-120.0 165.0 168.57 155.0 165.0 336.05 326.05 ABMW-3 CAMA 5/20/2015 Ash PVC 2.00 1012714.21 2030856.72 500.17 497.34 40.5 NA 40.5 43.50 35.3 40.5 462.04 456.84 ABMW-3S CAMA 5/27/2015 Saprolite PVC 2.00 1012718.52 2030858.24 500.30 497.33 68.0 0-43.0 61.0 63.16 50.0 60.0 447.33 437.33 ABMW-4 CAMA 5/31/2015 Ash PVC 2.00 1012345.36 2030478.85 491.44 488.76 60.0 NA 53.2 56.20 48.0 53.2 440.76 435.56 ABMW-4D CAMA 5/31/2015 Transition Zone PVC 2.00 41012348.07 1012350.06 2030467.97 491.50 488.68 64.5 0-54.5 64.5 65.75 55.8 61.0 432.88 427.68 ABMW-4BR CAMA 6/4/2015 Bedrock PVC 2.00 2030473.02 491.61 488.62 108.5 0-60.0 108.5 111.50 98.7 108.2 389.92 380.42 CSA Wells MW-3BR CAMA 2/10/2015 Bedrock PVC 2.00 1015654.79 2031277.75 438.24 435.53 77.0 NA 75.1 76.35 68.8 74.0 366.76 361.53 MW-5BR CAMA 1/30/2015 Bedrock PVC 2.00 1015146.30 2029179.66 511.40 508.74 67.0 NA 65.0 65.72 58.0 63.0 450.74 445.74 MW-6BR (piezometer) CAMA 4/13/2015 Bedrock PVC 2.00 1014756.09 2033040.31 463.99 461.70 100.0 NA 100.0 100.31 90.0 100.0 371.70 361.70 MW-7D CAMA 4/25/2015 Transition Zone PVC 2.00 1014307.45 2034169.17 453.94 451.17 32.5 NA 32.5 32.70 19.5 30.4 431.67 420.67 MW-7BR CAMA 4/24/2015 Bedrock PVC 2.00 11014311.86 2034175.46 453.50 451.21 77.5 NA 77.5 79.60 66.8 77.5 1 384.46 373.71 MW-8S (piezometer) CAMA 2/16/2015 Saprolite PVC 2.00 1014446.92 2034603.67 466.87 466.94 30.1 NA 30.1 30.20 25.1 30.1 441.90 436.90 MW-8D (piezometer) CAMA 2/16/2015 Transition Zone PVC 2.00 1014443.85 2034599.43 466.89 467.04 41.0 NA 41.0 38.30 33.3 38.5 433.77 428.54 MW-8BR CAMA 2/14/2015 Bedrock PVC 2.00 1014440.25 2034593.99 466.99 467.27 86.5 0-46.5 67.7 67.05 61.8 67.0 405.47 400.27 MW-9BR CAMA 4/11/2015 Bedrock PVC 2.00 1013360.32 2033864.48 495.39 492.85 66.0 NA 61.0 60.63 48.0 58.0 444.85 434.85 MW-10BR CAMA 2/25/2015 Bedrock PVC 2.00 1011436.41 2032770.90 513.39 513.47 65.5 NA 65.5 57.60 48.0 58.0 465.47 455.47 MW-11BR CAMA 4/24/2015 Bedrock PVC 2.00 1010083.75 2027499.40 527.36 524.34 95.0 NA 95.0 98.80 84.3 94.4 440.09 429.90 MW-12S CAMA 4/29/2015 Saprolite PVC 2.00 1008653.91 2029202.47 587.38 587.48 56.0 NA 51.0 50.40 39.5 49.5 547.98 537.98 MW-12D CAMA 4/28/2015 Transition Zone PVC 2.00 1008654.13 2029191.43 588.02 588.17 97.0 NA 97.0 96.55 87.0 97.0 501.17 491.17 MW-13BR CAMA 4/15/2015 Bedrock PVC 2.00 1013587.37 2027633.00 528.83 526.67 107.0 NA 100.0 100.71 88.8 99.0 437.87 427.97 MW-14BR CAMA 2/5/2015 Bedrock PVC 2.00 1015432.97 2028964.70 520.75 517.76 46.4 NA 35.4 36.87 29.0 34.0 488.76 483.76 MW-15BR (piezometer) CAMA 5/12/2015 Bedrock PVC 2.00 1016021.83 2031813.20 460.92 460.94 78.5 NA 64.0 62.64 52.6 62.5 407.94 397.94 MW-16S CAMA 5/8/2015 Alluvium PVC 2.00 1015654.53 2032640.89 371.11 367.94 8.5 NA 8.5 10.59 5.0 7.6 363.04 360.34 MW-16D CAMA 5/8/2015 Transition Zone PVC 2.00 1015659.09 2032643.26 371.21 367.74 39.0 NA 39.0 41.44 28.7 38.9 339.07 328.81 MW-16BR CAMA 5/8/2015 Bedrock PVC 2.00 1015664.50 2032645.73 371.30 367.83 65.0 0-47.2 59.5 62.26 48.7 59.0 319.13 308.87 MW-17BR CAMA/DATA GAP 1/10/2016 Bedrock PVC 2.00 1013955.00 2033766.00 490.55 487.51 120.0 NA 120.0 123.50 108.0 118.0 379.51 369.51 Previously Installed Wells BG-1 NPDES/CAMA BKGRD 10/15/2008 Bedrock PVC 2.00 2028480.40 1012000.52 540.11 537.04 UNK NA 52.0 55.20 42.0 52.0 495.04 485.04 BG-2 NPDES/CAMA BKGRD 9/28/2010 Transition Zone PVC 2.00 2028799.48 1010809.99 542.66 539.84 53.0 NA 53.0 48.40 25.4 44.9 514.44 494.94 CW-1 NPDES 11/9/2010 Transition Zone PVC 2.00 2032714.46 1012696.54 489.88 486.96 25.5 NA 25.5 28.82 15.5 25.0 471.46 461.96 CW-ID NPDES 11/8/2010 Bedrock PVC 2.00 2032715.65 1012703.55 490.96 488.31 40.4 NA 40.4 43.65 30.1 39.9 458.21 448.41 CW-2 NPDES 11/11/2010 Transition Zone PVC 2.00 2032238.71 1015043.98 389.00 386.56 18.0 NA 18.0 20.47 7.7 17.8 378.86 368.81 CW-2D NPDES 11/11/2010 Bedrock PVC 2.00 2032245.02 1015046.88 389.53 386.93 55.9 NA 55.9 58.55 45.6 55.4 341.33 331.53 CW-3 NPDES 11/16/2010 Transition Zone PVC 2.00 2031278.02 1015647.59 437.68 435.27 32.3 NA 32.3 34.76 17.0 31.8 418.27 403.47 CW-4 NPDES 11/12/2010 Bedrock PVC 2.00 2030436.27 1015911.44 451.31 448.76 40.3 NA 40.0 42.81 35.0 39.8 413.76 408.96 CW-5 NPDES 11/15/2010 1 Bedrock PVC 2.00 2029182.29 1 1015162.23 1 509.60 1 507.21 43.0 NA 43.0 44.03 36.3 41.1 470.91 1 466.11 CW-6 NPDES 11/11/2010 Bedrock PVC 2.00 2033046.08 1 1014743.82 1 462.83 1 UNK 1 77.4 1 NA 77.4 80.56 72.1 76.9 363.17 1 358.37 MW-2 VOLUNTARY/CAMA 1 10/14/2008 Bedrock I PVC 1 2.00 1 1015359.31 1 2030912.32 1 461.23 1 459.18 1 48.0 1 NA 1 48.0 1 50.12 1 38.0 1 48.0 1 421.18 1 411.18 P:\Duke Energy Progress.1026\10S. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-1 well construction summary.xlsx Page 1 of 2 TABLE 1-1 WELL CONSTRUCTION DATA MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC IDENTIFICATION PROGRAM DATE INSTALLED MONITORING ZONE MATERIAL DIAMETER (INCHES) NORTHING (FEET) EASTING (FEET) MEASURING POINT TOC ELEVATION (Feet- MSL) GROUND SURFACE ELEVATION (FEET- MSL) BORING DEPTH z' 3 (FEET BGS) SURFACE 3 CASING DEPTH (FEET BGS) TOTAL WELL DEPTH z' 3 (FEET BGS) MEASURED t WELL DEPTH (FEET TOC) SCREENED 3 INTERVAL (FEET BGS) TOP OF SCREEN ELEVATION (FEET- MSL) BOTTOM OF SCREEN ELEVATION (FEET- MSL) MW-3 VOLUNTARY/CAMA 10/14/2008 Alluvium PVC 2.00 1014955.04 2032010.00 384.00 UNK 18.0 NA 18.0 19.93 8.0 18.0 374.00* 364.00* MW-4 VOLUNTARY/CAMA 10/15/2008 Bedrock PVC 2.00 1013846.48 2032346.28 522.77 519.46 55.0 NA 55.0 59.05 35.0 S5.0 484.46 464.46 Previously Installed Piezometers P1 ASH BASIN DAM c. 1983 Earthen Dam PVC 2.00 1015210.58 2030732.42 475.86 473.43 UNK UNK UNK 51.22 UNK UNK UNK UNK PIA ASH BASIN DAM c. 1983 Earthen Dam PVC 2.00 1015207.52 2030735.62 475.00 473.38 UNK UNK UNK 36.40 UNK UNK UNK UNK P2 ASH BASIN DAM c. 1983 Earthen Dam PVC 2.00 1014965.67 2031226.56 458.65 455.77 UNK UNK UNK 49.66 UNK UNK UNK UNK P2A ASH BASIN DAM c. 1983 Earthen Dam PVC 2.00 1014968.75 2031221.26 458.62 456.17 UNK UNK UNK 18.00 UNK UNK UNK UNK P3 ASH BASIN DAM c. 1983 Earthen Dam PVC 2.00 1014648.01 2031793.01 446.99 443.69 UNK UNK UNK 67.84 UNK UNK UNK UNK P3A ASH BASIN DAM c. 1983 Earthen Dam PVC 2.00 1014650.72 2031787.93 445.69 443.39 UNK UNK UNK 51.34 UNK UNK UNK UNK P4 ASH BASIN DAM c. 1983 Earthen Dam PVC 2.00 1014521.83 2031950.40 454.57 452.59 UNK UNK UNK 64.15 UNK UNK UNK UNK P4A ASH BASIN DAM c. 1983 Earthen Dam PVC 2.00 1014524.33 2031947.13 454.99 452.70 UNK UNK UNK 36.17 L UNK UNK UNK UNK Prepared by: EMB Checked By: JAW Notes: BGS - Below ground surface PVC- Polyvinyl chloride NA - Not applicable UNK - Data not known MSL - Mean sea level NA - Not Applicable 1 - Well depths initially measured by SynTerra, June 17, 2015 and updated when new wells installed. 2 - "Boring Depth" is the total depth of soil boring; "Total Well Depth" is the depth to the bottom of the filter pack. 3 - Values measured during well installation. ? - No boring logs available for previously installed piezometers. * Estimated until ground surface elevation is resurveyed. 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Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-1 well construction summary.xlsx Page 2 of 2 TABLE 1-2 SURFICIAL GROUNDWATER EXCEEDANCES MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter pH Water Level Temp Spec Cond DO ORP Eh Turbidity Ferrous Iron Boron Chromium (VI) Chromium (VI) Speciation Cobalt Iron Manganese Strontium Sodium Vanadium Reporting Units S.U. ft Deg C umhos/cm mg/1 mV mV NTUs mg/1 ug/I ug/l ug/I ug/I ug/I ug/I ug/I mg/I ug/I 15A NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE 700 0.07A 0.07A 1* 300 50 NE NE 0.3* Sample ID Sample Collection Date Field Parameters Background MW-12S 06/18/2015 5.7 30.61 21 55 3.66 127 332 10.6 <0.5 <50 NA NA 1.09 295 267 27 6.79 0.403 MW-12S 09/10/2015 5.8 31.69 20 47 2.3 34 239 6.31 0 <50 NA NA 1.02 108 253 23 5.43 <0.3 MW-12S 12/02/2015 5.7 32.15 17 68 2.7 159 364 6.9 NM <50 0.043 NA <1 336 152 21 5.08 0.313 MW-12S 01/07/2016 5.8 31.69 10 111 2.86 185 390 9.89 0 <50 0.038 NA <1 178 68 18 4.76 <0.3 MW-12S 04/06/2016 5.8 29.91 14 46 2.91 159 364 7.42 NM <50 0.058 NA <1 338 24 17 5.49 0.408 Alluvial MW-3 03/19/2015 5.7 6.51 11 343 1.65 304 509 3.35 NM 847 NA NA <1 34 880 336 22 <0.3 MW-3 06/23/2015 6.0 6.63 17 360 0.6 310 515 2.09 NM NA NA 0.155 NA NA NA NA NA NA MW-3 09/08/2015 6.0 6.87 19 372 1.7 210 415 0.58 0 1050 NA NA <1 21 1210 342 23.7 0.384 MW-3 12/03/2015 5.7 6.41 14 348 1 212 417 0.29 0 930 0.2 NA <1 10 1310 328 22.9 <0.3 MW-3 01/06/2016 5.9 6.43 11 322 0.81 370 575 0.66 0 896 0.17 M1 NA <1 I <10 1420 328 22.8 <0.3 MW-3 DUP 01/06/2016 5.9 6.43 11 322 0.81 370 575 0.66 0 889 0.17 NA <1 <10 1420 326 22.7 <0.3 MW-16S 06/23/2015 6.0 3.88 30 144 1.68 96 301 3.44 NM <50 NA 0.011 4.32 860 260 109 11.2 0.303 MW-16S 09/09/2015 6.5 4.03 23 172 2.6 -20 185 4.4 2 <50 NA <0.007 10.3 3860 768 131 9.54 <0.3 MW-16S 12/04/2015 6.8 3.34 13 166 1.81 -6 199 4.46 1.5 <50 <0.03 NA 6 1200 530 120 15.8 <1 MW-16S 01/07/2016 6.4 3.25 7 146 3.46 99 t 304 9.39 0.5 <50 0.083 NA 2.11 520 252 113 15.6 <0.3 Saprolite ABMW-3S 06/17/2015 5.2 17.26 23 137 0.2 8 213 4.96 2.5 1100 NA NA 3.98 2630 478 59 19.4 <0.3 ABMW-3S 09/10/2015 5.4 18.21 24 166 0.7 40 245 4.02 3 1130 NA NA 5.33 10400 918 92 18.7 <0.3 ABMW-3S 12/01/2015 5.8 17.11 12 96 1 140 345 3.95 0 635 <0.03 NA 1.82 465 282 55 13.5 <0.3 ABMW-3S 01/05/2016 5.4 16.95 7 128 0.62 112 317 1.59 1.5 1220 <0.03 NA 3.42 4340 531 78 17.1 <0.3 Notes: - Bold highlighted concentration indicates exceedance of the 15A NCAC 02L Standard, Appendix 2, April 1, 2013. ug/I = microgram per liter Deg C = Degree Celsius mg/I = milligrams per liter NE = Not Established umhos/cm = micro mhos per centimeter DO = Dissolved Oxygen NTU = Nephelometric Turbidity Unit ORP = Oxidation Reduction Potential S.U. = Standard Unit mV = millivolts Spec Cond = Specific Conductance Eh = Redox Potential * - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April, 1, 2013. < = concentration not detected at or above reporting limit Values indicated in red associated with sample turbidity greater than 10 NTU. M1 = Matrix spike recovery was high: the associated Laboratory Control Spike (LCS) was acceptable. A = NC DHHS Health Screening Level. Temp = Temperature NO = Not detected above reporting limit NM = Not Measured NA = Not Analyzed ft = feet Prepared by: BER Checked by: JAW P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-2 Surficial GW Exceedances thru CSA Round 5.xlsx Page 1 of 1 TABLE 1-3 TRANSITION ZONE GROUNDWATER EXCEEDANCES MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter pH ,Spec Level ater Temp Cond DO ORP Eh Turbidity Ferrous Iron Antimony Arsenic Barium Boron Cadmium Chromium (VI) Chromium (VI) Speciation Chromium Cobalt Iron Manganese Sodium Strontium Total Dissolved Solids Vanadium Reporting Units S.U. ft Deg C umhos/cm mg/l mV mV NTUs mg/I ug/I ug/l ug/l ug/I ug/l ug/l ug/I ug/I ug/l ug/1 ug/1 mg/I ug/I mg/I ug/l ISA NCAC 02L Standard 6.5-8.5 NE NE NE I NE NE NE NE NE 1* 10 700 700 2 0.07- 0.07A 10 1* 300 50 NE NE Soo 0.3* Sample ID Sample Collection Date Field Parameters Analytical Results Background BG-2 12/02/2010 6.6 35.57 19 576 NM NM NM 13 NM <0.5 <5 81.8 <50 <0.08 NA NA 6.7 NA 2660 198 NA NA 349 NA BG-2 04/20/2011 6.3 33.35 21 623 1.26 7 212 12.1 NM <0.5 <5 61.3 <50 <0.08 NA NA <5 NA 439 71.4 NA NA 382 NA BG-2 07/11/2011 6.3 35.45 26 706 0.32 -77 128 9.2 NM <0.5 <5 64.8 B <50 <0.08 NA NA 10.2 NA 559 64.2 NA NA 367 B NA BG-2 11/03/2011 6.3 35.90 17 671 0.67 -98 107 5.63 NM <0.5 <5 67.7 <50 <0.08 NA NA 7.5 NA 312 36.7 NA NA 341 NA BG-2 04/04/2012 6.3 35.71 21 647 0.34 -93 113 5.55 NM <0.5 <5 61.5 <50 <0.08 NA NA <5 NA 152 27 NA NA 412 NA BG-2 07/09/2012 6.3 35.94 20 652 0.51 -78 127 9.47 NM <0.5 <5 53.4 <50 <0.08 NA NA 5.9 NA 460 54.9 NA NA 382 NA BG-2 11/05/2012 6.3 36.20 17 640 0.51 90 295 9.02 NM <0.5 <5 60.2 <50 <0.08 NA NA 6 NA 759 43.7 NA NA 389 NA BG-2 04/10/2013 6.3 35.33 18 725 0.17 -17 188 8.5 NM <1 <1 66 <50 <1 NA NA <5 NA 646 111 NA NA 430 NA BG-2 07/09/2013 6.4 34.66 19 695 0.31 -120 85 8.08 NM <1 <1 69 <50 <1 NA NA <5 NA 1130 248 NA NA 430 NA BG-2 11/13/2013 6.4 34.40 17 658 0.1 18 223 9.5 NM <1 <1 62 <50 <1 NA NA <5 NA 841 177 NA NA 360 NA BG-2 04/01/2014 6.4 33.78 17 709 0.2 68 273 7.5 NM <1 <1 71 <50 <1 NA NA <5 NA 943 226 NA NA 450 NA BG-2 07/18/2014 6.4 33.20 18 664 0.14 2 207 7.71 NM <1 <1 65 <50 <1 NA NA <5 NA 1010 244 NA NA 400 NA BG-2 11/12/2014 6.3 33.02 18 630 0.12 21 226 5.33 NM <1 <1 61 <50 <1 NA NA <5 NA 647 180 NA NA 370 NA BG-2 04/13/2015 6.3 31.93 18 652 0.2 -11 194 7.09 NM <1 <1 54 <50 <1 NA NA <5 <1 435 150 49.7 NA 380 NA BG-2 DUP 04/13/2015 6.3 31.93 18 652 0.2 -11 194 7.09 NM <1 <1 55 <50 <1 NA NA <5 <1 546 155 50.3 NA 360 NA BG-2 07/07/2015 6.5 31.53 19 623 0.3 -129 76 8.51 NM <1 <1 54 <50 <1 NA <0.021 <5 <1 467 135 48.2 NA 370 5.88 BG-2 09/11/2015 6.4 31.49 18 537 0.03 -40 165 6.88 0 <1 <1 50 <50 <1 NA NA 4.05 <1 244 130 44.6 291 330 4 BG-2 11/03/2015 6.7 31.89 18 14 7.88 59 264 11.3 NM <1 <1 51 <50 <1 NA NA <5 <1 513 102 46.7 318 350 6.63 BG-2 12/09/2015 6.4 31.68 16 612 0.71 3 208 1 5.24 0.25 <0.5 <0.5 60 <50 <0.08 <0.03 NA <0.5 B <0.5 450 200 51.3 390 314 5.8 BG-2 01/08/2016 6.4 31.23 17 588 0.9 -16 189 1.98 0.5 <1 <1 58 <50 <1 <0.03 NA <1 <1 471 196 50.6 1 350 370 4.2 BG-2 04/04/2016 6.4 30.42 18 651 0.15 139 344 2.71 0.5 <1 <1 65 <50 <1 <0.03 NA <5 <1 585 237 56 391 360 5 MW-12D 06/24/2015 6.2 31.15 17 136 2.42 -1 204 4.02 0 1.63 <1 26 <50 <1 NA NA <1 1.37 1 326 683 8.98 95 120 0.719 MW-12D 06/25/2015 6.2 31.10 17 124 2.72 29 234 4.5 0 NA NA NA NA NA NA 0.334 NA NA NA NA NA NA NA NA MW-12D 09/10/2015 6.2 32.10 17 125 2.6 39 244 3.88 0 <1 <1 20 <50 <1 NA 0.357 1.1 <1 277 218 9.03 85 100 0.637 MW-12D 12/02/2015 6.0 32.50 16 135 3.4 135 340 11.3 0 1.44 <1 21 <50 <1 0.55 NA 3.43 <1 504 193 9.18 90 97 1.01 MW-12D DUP 12/02/2015 6.0 32.50 16 135 3.4 135 340 11.3 0 <1 <1 20 <50 <1 0.64 NA 3.13 <1 393 193 9.24 91 69 0.768 MW-12D 12/04/2015 6.1 32.83 18 122 3.35 140 345 8.08 0 <0.5 <0.5 1 20 <50 0.099 0.64 M 1 NA 4.6 0.51 280 160 9.56 85 122 <1 MW-12D 01/07/2016 6.1 31.95 15 118 3.1 136 341 9.26 NM <1 <1 22 <50 <1 0.52 M 1 NA 2.99 <1 968 131 8.76 87 82 1.65 MW-12D 04/05/2016 5.9 30.28 16 125 3.A 120 325 9.9 NM <1 <1 21 <50 <1 0.6 NA 1.64 <1 385 100 9.35 92 120 1.06 Transition Zone ABMW-4D 06/22/2015 6.6 6.04 24 1174 0.7 231 436 2.03 4.5 3.68 140 755 5090 <1 NA <0.005 <1 6.71 28300 3640 22.9 3070 680 23.3 ABMW-4D 09/09/2015 6.6 7.92 27 1245 0.5 -128 77 4.04 7 <1 143 953 4610 <1 NA NA <1 3.38 44400 4550 20.5 2660 700 11.7 ABMW-4D 12/01/2015 6.6 6.41 18 873 0.2 -153 52 14.34 6.5 <1 84.2 990 3950 <1 <0.03 NA 1.49 3.82 60300 5250 17.6 2140 540 12.1 ABMW-4D 01/05/2016 6.0 6.10 10 1237 0.8 -102 103 9.26 NM <1 60.9 1080 4010 <1 <0.03 NA <1 3.95 72100 6650 18.2 2070 630 6.01 CW-1 12/06/2010 6.7 19.84 16 236 NM NM NM 8.4 NM <0.5 <5 6 <50 0.082 NA NA <5 NA <50 104 NA NA 147 NA CW-1 07/09/2013 5.6 18.06 21 169 2.83 -22 184 2.05 NM <1 <1 <5 <50 2.19 NA NA <5 NA 21 8 NA NA 140 NA CW-1 04/13/2015 5.7 16.99 19 178 3.8 310 515 2.63 NM <1 <1 6 <50 1.23 NA NA <5 <1 608 27 17.3 NA 160 NA CW-1 07/08/2015 5.5 17.65 20 182 3.3 187 392 3 NM <1 <1 <5 <50 <1 NA NA <5 <1 31 6 17 NA 150 0.543 CW-1 09/11/2015 5.7 19.42 20 180 2.5 210 415 2.75 0 <1 <1 <5 <50 <1 NA NA <1 <1 93 10 17.1 71 140 0.687 CW-1 11/04/2015 5.8 18.24 18 189 3.94 158 363 5.07 NM <1 <1 12 67 <1 NA NA 53 <1 142 29 16.7 92 130 0.661 CW-1 04/04/2016 6.0 17.10 18 180 3.54 159 364 1.3 0 <1 <1 7 <50 <1 NA NA <5 <1 366 13 18.2 89 160 1.1 CW-2 04/05/2012 5.6 13.61 13 243 1.19 -40 165 1.02 NM <0.5 <5 105 459 <0.08 NA NA <5 NA <50 107 NA NA 140 NA CW-2 07/10/2012 5.3 15.05 18 303 0.74 -66 139 1.3 NM <0.5 <5 95.2 590 0.12 NA NA <5 NA <50 184 NA NA 186 NA CW-2 11/05/2012 5.5 14.58 15 346 1.2 220 1 425 0.21 NM <0.5 <5 138 665 0.086 NA NA <5 NA <50 186 NA NA 199 NA CW-2 04/10/2013 5.3 12.75 16 269 2.53 202 407 0.59 NM <1 <1 115 522 <1 NA NA <5 NA <10 140 NA NA 150 NA CW-2 DUP 04/10/2013 5.3 12.75 16 269 2.53 202 407 0.59 NM <1 <1 113 513 <1 NA NA <5 NA <10 138 NA NA 150 NA CW-2 07/09/2013 5.2 13.62 21 300 0.91 104 309 3.21 NM <1 <1 124 696 <1 NA NA <5 NA 51 360 NA NA 190 NA CW-2 11/13/2013 5.3 14.40 12 367 1.7 234 439 6.8 NM <1 <1 157 785 <1 NA NA <5 NA 77 535 NA NA 220 NA CW-2 04/01/2014 5.3 12.80 12 241 3.7 241 446 0.9 NM <1 <1 106 517 <1 NA NA <5 NA 12 135 NA NA 150 NA CW-2 DUP 04/01/2014 5.3 12.80 12 241 3.7 241 446 0.9 NM <1 <1 102 498 <1 NA NA <5 NA 16 131 NA NA 150 NA CW-2 07/16/2014 5.0 14.59 16 291 1.4 298 1 503 1.37 NM <1 <1 116 700 <1 NA NA <5 NA 44 260 NA NA 210 NA CW-2 11/12/2014 5.0 14.30 16 396 1.05 275 480 0.83 NM <1 <1 178 878 <1 NA NA <5 NA 17 1020 NA NA 230 NA CW-2 DUP 11/12/2014 5.0 14.30 16 396 1.05 275 480 0.83 NM <1 <1 176 863 <1 NA NA <5 NA <10 1000 NA NA 240 NA CW-2 24/14/2015 5.0 12.36 13 215 1.9 323 528 1.09 NM <1 <1 97 524 <1 NA NA <5 <1 17 170 12.9 NA 140 NA CW-2 07/07/2015 5.1 13.33 16 286 0.8 214 419 0.96 NM <1 <1 129 804 <1 NA 0.1 <5 <1 <10 393 17.3 NA 210 <0.3 CW-2 09/08/2015 5.3 14.77 18 326 1.8 182 387 1.81 1.5 <1 <1 130 S48 <1 NA NA <1 <1 11 465 20.4 291 1 250 0.358 P:\Duke Energy Progress. 1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tab1es\Tab1e 1-3 Transition Zone Exceedances thru CSA Round 5.xlsx Page 1 of 2 TABLE 1-3 TRANSITION ZONE GROUNDWATER EXCEEDANCES MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter pH Watel er Temp Lund DO ORP Eh Turbidity Ferrous Iron Antimony Arsenic Barium Boron Cadmium Chromium (VI) Chromium (VI) Speciation Chromium Cobalt Iron Manganese Sodium Strontium Total Dissolved Solids Vanadium Reporting Units S.U. ft Deg C umhos/cm mg/I mV mV NTUs mg/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I mg/I ug/I mg/I ug/I ISA NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE 1* 10 700 700 2 0.07^ 0.07^ 10 1* 300 50 NE NE Soo 0.3* Sample ID Sample Collection Date Field Parameters Analytical Results CW-2 11/04/2015 5.2 13.04 15 337 2.22 250 455 0.55 NM <1 <1 163 770 <1 NA NA 6 <1 22 298 18.3 290 210 <0.3 CW-2 DUP 11/04/2015 5.2 13.04 15 337 2.22 250 455 0.55 NM <1 <1 162 765 <1 NA NA <5 <1 19 298 18.2 289 200 <0.3 CW-2 12/02/2015 5.0 12.21 15 284 2.13 179 384 2.77 1.5 <1 <1 143 665 <1 0.12 NA <1 <1 162 294 16.2 250 170 0.326 CW-2 01/06/2016 5.1 12.39 13 210 2.62 189 394 0.58 0 <1 <1 99 539 <1 0.087 NA <1 <1 11 173 12.9 177 130 <0.3 CW-2 04/04/2016 5.3 12.87 16 218 1.77 265 470 0.48 0 <1 <1 102 562 <1 NA NA <5 <1 <10 127 12.9 178 140 <0.3 CW-3 12/02/2010 6.7 16.09 14 761 NM NM NM 9.9 NM <0.5 <5 47.9 <50 <0.08 NA NA <5 NA 908 481 NA NA 438 NA CW-3 04/21/2011 6.4 15.24 14 738 2.1 -77 129 5.73 NM <0.5 <5 27.7 <50 <0.08 NA NA <5 NA 128 305 NA NA 463 NA CW-3 07/12/2011 6.3 15.53 22 765 0.71 -118 87 4.32 NM <0.5 <5 24.5 B <50 <0.08 NA NA <5 NA 99.7 201 NA NA 474 NA CW-3 04/04/2012 6.5 15.85 16 617 3.13 -75 130 5.56 NM <0.5 <5 25.5 <50 <0.08 NA NA <5 NA 117 254 NA NA 456 NA CW-3 DUP 04/04/2012 6.5 15.85 16 617 3.13 -75 130 5.56 NM <0.5 <5 26 <50 <0.08 NA NA <5 NA 115 258 NA NA 452 NA CW-3 07/09/2012 6.3 16.98 20 736 1.59 -52 153 4.61 NM <0.5 <5 22.2 <50 <0.08 NA NA <5 NA 92.2 120 NA NA 487 NA CW-3 04/10/2013 6.4 17.49 19 763 2.56 NM NM 2.65 NM <1 <1 26 <50 <1 NA NA <5 NA 57 153 NA NA 520 NA CW-3 07/09/2013 6.3 16.42 20 735 1.28 -629 -424 4.88 NM I<1 <1 21 1 <50 <1 NA NA <5 NA 95 61 NA NA 510 NA CW-3 04/01/2014 6.5 16.30 16 707 3.6 216 1 421 1.3 NM <1 <1 24 <50 <1 NA NA <5 NA 21 100 NA NA 470 NA CW-3 07/06/2015 6.5 15.93 21 645 1 46 251 2.78 NM <1 <1 19 <50 <1 NA NA <5 <1 71 <5 44.5 NA 440 1.41 CW-3 09/08/2015 6.4 17.12 22 648 0.8 57 262 1.6 0 <1 <1 15 <50 <1 NA NA <1 <1 11 <5 43.5 338 430 1.52 CW-3 11/03/2015 6.5 17.54 18 628 0.9 65 270 0.53 NM <1 <1 15 <50 <1 NA NA <5 <1 14 <5 44.5 B2 335 400 1.48 CW-3 04/05/2016 6.5 15.10 12 612 2.83 170 375 0.37 NM <1 <1 18 <50 <1 NA NA <5 <1 <10 34 42.1 321 390 1.23 CW-4 12/02/2010 6.4 22.53 13 195 NM NM NM 21 NM <0.5 <5 29.6 <50 <0.08 NA NA <5 NA 784 16.1 NA NA 150 NA CW-4 07/06/2015 5.9 21.64 18 162 3 105 310 2.76 NM <1 <1 25 <50 1<1 NA NA <5 <1 87 <5 15.5 NA 160 1.02 CW-4 09/09/2015 5.9 22.33 19 190 1.5 136 1 341 1.63 NM <1 <1 26 <50 <1 NA NA <1 <1 30 <5 15.7 138 140 1.07 CW-4 11/03/2015 6.0 22.48 16 178 2.2 155 360 2.76 NM <1 <1 27 <50 <1 NA NA <5 <1 151 5 16.6 B2 138 140 1.28 CW-4 04/05/2016 6.1 21.15 11 175 1.9 172 377 3.3 NM <1 <1 23 <50 <1 NA NA <5 <1 58 7 15.6 116 140 0.888 MW-7D 06/19/2015 6.4 9.30 24 668 2.37 -8 197 12.1 0 <1 <1 24 <50 <1 NA NA <1 <1 69 188 30.7 442 390 0.798 MW-7D 09/11/2015 6.3 12.33 19 1171 0.6 102 307 4.96 0 <1 <1 24 <50 <1 NA NA <1 <1 161 166 2.79 418 370 0.843 MW-7D 12/02/2015 6.3 11.19 15 622 0.35 43 248 5.6 0 <1 <1 21 <50 <1 <0.03 NA <1 <1 348 1 93 33.4 448 370 0.779 MW-7D 01/06/2016 6.8 9.86 12 553 0.78 70 275 3.88 0 <1 <1 19 <50 <1 1<0.03 NA <1 <1 154 69 32.3 417 340 1 0.757 MW-16D 06/23/2015 7.1 3.51 19 221 2.49 55 1 260 9.38 0 <1 <1 13 <50 <1 NA 0.051 <1 <1 87 269 9.77 163 160 0.617 MW-16D DUP 06/23/2015 7.1 3.51 19 221 2.49 55 260 9.38 0 <1 <1 13 <50 <1 NA 0.061 <1 <1 85 261 9.72 163 150 0.729 MW-16D 09/09/2015 6.6 4.04 20 234 1.5 79 284 7.27 0 <1 <1 10 <50 <1 NA 0.066 <1 <1 79 141 9.69 166 150 0.676 MW-16D DUP 09/09/2015 6.6 4.04 20 234 1.5 79 284 7.27 0 <1 <1 10 <50 <1 NA 0.069 <1 <1 90 143 9.66 166 150 0.772 MW-16D 12/04/2015 7.1 3.26 14 222 1.99 80 285 8.47 0 <0.5 <0.5 9.700001 <50 <0.08 0.097 NA 0.9 <0.5 610 63 9.84 170 188 <1 MW-16D DUP 12/04/2015 7.1 3.26 14 222 1.99 80 285 8.47 0 <0.5 <0.5 12 <50 <0.08 0.095 NA 1.1 <0.5 900 82 9.69 170 202 <1 MW-16D 01/07/2016 7.1 3.04 13 269 2.1 157 362 4.8 0 <1 <1 7 <50 <1 0.097 NA <1 <1 203 28 9.62 161 130 0.678 MW-16D DUP 01/07/2016 7.1 3.04 13 269 2.1 157 362 4.8 0 <1 <1 7 <50 <1 0.1 NA <1 <1 200 27 9.56 159 140 0.598 Prepared by: BER Checked by. JAW Notes: - Bold highlighted concentration indicates exceedance of the 15A NCAC 02L Standard, Appendix 2, April 1, 2013 ug/I = microgram per liter Deg C = Degree Celsius Temp = Temperature mg/I = milligrams per liter DUP = Duplicate ft = feet umhos/cm = micro mhos per centimeter DO = Dissolved Oxygen NM = Not Measured NTU = Nephelometric Turbidity Unit ORP = Oxidation Reduction Potential NA = Not Analyzed S.U. = Standard Unit Spec Cond = Specific Conductance NE = Not Established mV = millivolts Eh = Redox Potential B = data Flagged due to a detection in the field blank = NC DHHS Health Screening Level. Values indicated in red associated with sample turbidity greater than 10 NTU. * - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April, 1, 2013. < = concentration not detected at or above reporting limit P:\Duke Energy Progress. 1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-3 Transition Zone Exceedances thru CSA Round 5.xlsx Page 2 of 2 TABLE 1-4 BEDROCK GROUNDWATER EXCEEDANCES MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter PH Water Level Temp Spec Cond DO ORP Eh Turbidity Ferrous Iron Antimony Barium Chromium (VI) Chromium (VI) Speciation Chromium Cobalt Iron Lead Manganese Selenium Sodium Strontium Thallium Total Dissolved Solids Vanadium Reporting Units S.U. ft Deg C umcros mg/i mV mV NTUs mg/I ug/I ug/I ug/I ug/I ug/1 ug/1 ug/I ug/1 ug/1 ug/I mg/I ug/I ug/I mg/I ug/I 15A NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE 1* 700 0.07^ 0.07^ 10 1* 300 15 50 20 NE NE 0.2* 500 0.3* Sample ID Sample Collection Date Field Parameters Analytical Results Background BG-1 10/31/2008 5.7 35.99 16 141 NM NM NM NM NM 0.13 1040 NA NA 36.9 NA 65700 33.1 2270 2.4 NA NA 0.35 189 NA BG-1 06/04/2009 6.9 34.44 18 161 NM NM NM NM NM 2.5 155 NA NA 4.7 NA 2100 12.9 131 <5 NA NA <1 167 NA BG-1 10/21/2009 5.3 36.55 16 102 NM NM NM NM NM 4.2 175 NA NA 15.7 NA 4610 2.3 166 <5 NA NA <1 146 NA BG-1 04/22/2010 5.6 33.59 15 107 NM NM NM NM NM <10 120 NA NA 8.2 NA 2000 12 39 <10 NA NA <50 17 NA BG-1 12/06/2010 5.9 36.64 16 186 NM NM NM 10 NM <0.5 105 NA NA 15.3 NA 1080 <5 26.3 <10 NA NA <0.1 126 NA BG-1 04/20/2011 5.5 35.36 20 158 1.16 50 255 22.7 NM <0.5 99.1 NA NA 6.1 NA 702 <5 26.6 <10 NA NA <0.1 135 NA BG-1 07/11/2011 5.5 35.57 24 163 0.99 -71 134 24.2 NM <0.5 101 B NA NA 40.1 NA 1040 <5 29.6 <10 NA NA <0.1 117 B NA BG-1 11/03/2011 5.5 37.18 18 165 1.27 -103 102 3.84 NM <0.5 95.4 NA NA 7.9 NA 261 <5 8.9 <10 NA NA <0A 106 NA BG-1 04/04/2012 5.6 36.01 21 168 0.93 -91 114 9.52 NM <0.5 93 NA NA 6.7 NA 388 <5 11.6 <10 NA NA <0.1 107 NA BG-1 07/09/2012 5.3 36.69 19 166 1.05 -64 141 9.32 NM <0.5 101 NA NA 20 NA 640 <5 21.6 <10 NA NA <0.1 128 NA BG-1 11/05/2012 5.4 37.45 17 166 0.89 178 383 9.45 NM <0.5 101 NA NA <5 NA 526 <5 55.6 <10 NA NA <O.1 123 NA BG-1 04/10/2013 5.2 35.25 17 165 0.79 213 418 9.05 NM <1 97 NA NA 7 NA 323 <1 15 <1 NA NA <0.2 130 NA BG-1 07/09/2013 5.4 34.17 19 160 1.02 152 357 8.95 NM <1 97 NA NA <5 NA 488 <1 48 <1 NA NA <0.2 130 NA BG-1 11/13/2013 5.5 34.42 15 160 1.3 256 461 8.2 NM <1 95 NA NA <5 NA 412 <1 27 <1 NA NA <0.2 130 NA BG-1 04/01/2014 5.4 32.85 15 159 1.2 340 545 8.2 NM <1 90 NA NA <5 NA 290 <1 14 <1 NA NA <0.2 140 NA BG-1 07/18/2014 5.5 32.12 19 158 1.4 232 437 6.68 NM <1 93 NA NA <5 NA 325 <1 15 <1 NA NA <0.2 140 NA BG-1 11/12/2014 5.5 31.90 18 167 1.64 255 460 9.96 NM <1 95 NA NA <5 NA 466 <1 25 <1 NA NA <0.2 120 NA BG-1 04/13/2015 5.5 30.16 17 154 1.2 296 501 8.9 NM <1 90 NA NA <5 <1 409 <1 35 <1 12.4 NA <0.2 130 NA BG-1 07/07/2015 5.6 29.86 18 151 1.6 113 318 10 NM <1 97 NA NA <5 <1 557 <1 23 <1 11.8 NA <0.2 130 4.94 BG-1 09/10/2015 5.3 30.43 19 168 1.5 190 395 7.83 0 <1 91 NA NA <1 <1 300 <1 26 <1 11.6 172 <0.2 120 3.93 BG-1 11/03/2015 6.9 30.00 20 14 9.3 7 212 1.79 NM <1 90 NA NA <5 <1 45 <1 7 <1 11.8 B2 179 <0.2 110 3.4 BG-1 12/05/2015 5.5 30.34 16 150 1.55 128 333 9.5 0 <0.5 94 0.31 NA 1 <0.5 350 0.13 18 <0.5 12.2 180 <0.1 118 4.2 BG-1 01/08/2016 5.1 29.36 15 147 1.48 67 272 5.78 0 <1 87 0.2 NA <1 <1 272 <1 it <1 11.9 166 <0.2 130 3.94 BG-1 04/04/2016 5.5 28.46 17 149 1.58 206 411 4.3 0 <1 88 0.19 M1 NA <5 <1 190 <1 12 <1 11.5 167 <0.2 130 3.94 MW-IOBR 03/17/2015 6.2 13.19 22 467 0.55 99 304 35.5 0.5 <1 27 NA NA 1.3 <1 883 <1 894 <1 37.9 210 <0.2 330 1.66 MW-IOBR 09/11/2015 6.1 13.36 25 452 0.5 14 219 1.06 0 <1 5 NA NA <1 <1 37 <1 135 <1 39.7 198 <0.2 310 1.73 MW-IOBR 12/03/2015 6.1 13.30 16 424 0.4 19 224 1.5 0.5 <1 <5 <0.03 NA <1 <1 193 <1 84 <1 37.7 198 <0.2 320 1.5 MW-IOBR O1/07/2016 6.1 13.08 13 449 0.53 50 255 1.64 0 <1 <5 <0.03 NA <1 <1 33 <1 103 <1 39.5 195 <0.2 300 1.68 MW-IOBR 04/05/2016 6.2 12.70 13 443 0.43 141 346 0.98 NM <1 <5 <0.03 NA <1 <1 29 <1 71 <1 38.8 195 <0.2 300 1.7 MW-11BR 06/25/2015 8.1 40.25 19 382 2.79 28 233 3.91 0 1.32 44 NA NA 1.73 <1 115 <1 67 <1 14.3 200 0.323 250 2.69 MW-11BR 09/11/2015 9.2 36.86 21 282 1.1 33 238 7.87 0 1.74 32 NA NA 15.6 <1 153 <1 11 1.16 15.6 318 <0.2 180 9.15 MW-11BR 12/03/2015 9.2 36.70 14 230 1.8 -10 195 8.7 0 1.57 22 13.6 NA 24.1 <1 304 <1 29 1.04 20.7 250 <0.2 150 12.1 MW-11BR O1/07/2016 9.8 36.18 14 214 1.2 -40 165 5.04 0 1.9 24 12.2 NA 15.1 <1 98 <1 17 <1 16.6 253 <0.2 130 12.7 MW-11BR 04/05/2016 10.3 35.21 15 208 1.28 154 359 6.43 NM 1.6 25 18.4 NA 17.2 <1 178 <1 25 <1 16.5 256 <0.2 140 14.5 MW-13BR 06/23/2015 7.2 31.28 21 580 0.4 -228 -23 2.22 1 <1 40 NA 0.005 <1 1.19 1130 <1 474 <1 25.7 418 <0.2 370 0.381 MW-13BR 09/08/2015 6.9 31.63 23 579 0.5 -136 69 7.55 2 <1 51 NA NA <1 <1 2400 <1 630 <1 24.8 430 0.538 360 0.465 MW-13BR 12/02/2015 7.0 31.55 16 543 0.3 -130 75 6.5 2.5 <1 45 <0.03 NA 16.3 <1 2490 <1 548 <1 23.3 416 <0.2 330 0.429 MW-13BR O1/07/2016 7.3 30.36 11 544 0.5 -75 130 7.79 1.5 <1 42 <0.03 NA 7.65 <1 2550 <1 519 <1 23.7 389 <0.2 330 <0.3 MW-13BR 04/05/2016 7.1 29.70 15 566 0.3 151 356 9.05 NM <1 35 <0.03 NA <1 1.01 1750 <1 481 <1 20.8 393 <0.2 340 <0.3 MW-14BR 03/12/2015 6.7 16.20 14 278 0.47 41 224 35 0.5 <1 30 NA NA <1 1.41 907 <1 544 <1 33 149 <0.2 190 1.29 MW-14BR 09/09/2015 6.9 18.03 22 413 1.1 -16 189 3.36 1.5 <1 42 NA NA <1 1.09 2730 <1 648 <1 60.2 167 <0.2 260 0.469 MW-14BR 12/02/2015 6.7 16.54 15 282 0.57 26 231 2.77 0 <1 22 <0.03 NA <1 <1 396 <1 304 <1 41.6 141 <0.2 210 1.82 MW-14BR O1/07/2016 6.7 16.31 11 258 2.73 64 269 2.45 0 <1 17 <0.03 NA <1 <1 98 <1 199 <1 37.4 131 <0.2 180 2.45 MW-14BR 04/05/2016 6.7 1 16.27 1 14 261 2.13 1 220 1 425 1 2.45 NM <1 19 <0.03 NA <1 <1 89 <1 196 <1 38.4 134 <0.2 200 2.86 P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment P1an\19.EG_CSASUP\Tab1es\Tab1e 1-4 Bedrock Exceedances thru CSA Round 5.xlsx Page 1 of 4 TABLE 1-4 BEDROCK GROUNDWATER EXCEEDANCES MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter PH Water Level Temp Spec Cond DO ORP Eh Turbidity Ferrous Iron Antimony Barium Chromium (VI) Chromium (VI) Speciation Chromium Cobalt Iron Lead Manganese Selenium Sodium Strontium Thallium Total Dissolved Solids Vanadium Reporting Units S.U. ft Deg C umcros mg/i mV mV NTUs mg/I ug/I ug/I ug/I ug/I ug/1 ug/1 ug/I ug/1 ug/1 ug/I mg/I ug/I ug/I mg/I ug/I 15A NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE 1* 700 0.07^ 0.07^ 10 1* 300 15 s0 20 NE NE 0.2* 500 0.3* Sample ID Sample Collection Date Field Parameters Analytical Results Bedrock ABMW-2BR 06/17/2015 7.2 11.32 31 631 0.7 -57 148 3.28 0 <1 159 NA NA <1 <1 107 <1 149 <1 26 1270 <0.2 370 0.873 ABMW-2BR 09/10/2015 7.3 11.63 24 603 1.1 -109 96 7.34 0 <1 129 NA NA <1 <1 804 <1 189 <1 31.7 1030 <0.2 350 <0.3 ABMW-2BR 12/01/2015 7.2 11.02 13 593 1.16 -47 158 0.88 0.3 <1 122 <0.03 M1 NA <1 <1 672 <1 198 <1 29.7 1060 0.21 170 <0.3 ABMW-2BR 01/05/2016 7.4 10.86 3 543 1.34 -126 79 3.53 2 <1 123 <0.03 NA <1 <1 1100 <1 237 <1 29.3 1090 <0.2 350 0.315 ABMW-2BRL 02/02/2016 6.9 11.48 17 506 2.47 136 341 2.36 0 <1 58 0.052 NA <1 <1 106 <1 161 <1 17.5 2260 <0.2 310 0.45 ABMW-2BRL 04/05/2016 7.3 11.88 16 517 0.27 -173 32 0.77 NM <1 59 <0.03 NA <1 <1 896 <1 219 <1 16.7 2220 <0.2 320 <0.3 ABMW-4BR 06/23/2015 7.4 6.00 26 556 0.5 -244 -39 5.03 0.5 <1 115 NA 0.005 <1 <1 1590 <1 407 <1 21.2 2020 <0.2 370 0.382 ABMW-4BR 09/09/2015 7.5 7.89 26 523 0.8 -212 -7 4.5 0.5 <1 106 NA NA <1 <1 360 <1 350 <1 20.9 1820 <0.2 320 0.458 ABMW-4BR 12/01/2015 7.6 6.25 17 398 0.19 -278 -73 2.49 0 <1 102 0.043 NA <1 <1 318 <1 330 <1 20.9 1730 <0.2 640 0.594 ABMW-4BR 01/05/2016 7.6 5.43 7 531 2.93 -240 -35 1.36 0 <1 110 <0.03 NA <1 <1 295 <1 364 <1 21.7 1780 <0.2 300 0.438 CW-ID 12/02/2010 7.5 18.64 17 390 NM NM NM 9.3 NM <0.5 11.1 NA NA 11 NA 207 <5 422 <10 NA NA <0.1 218 NA CW-ID 11/06/2012 7.0 20.31 13 384 1.07 149 354 2.15 NM <0.5 <5 NA NA <5 NA <50 <5 52.6 <10 NA NA <0.1 203 NA CW-ID 07/08/2015 6.8 19.01 21 348 0.6 132 337 4.2 NM <1 <5 NA NA <5 <1 <10 <1 <5 <1 12.8 NA <0.2 200 1.09 CW-ID 09/11/2015 6.9 20.28 20 341 0.5 108 313 1.07 0 <1 <5 NA NA <1 <1 <10 <1 <5 <1 12.7 166 <0.2 210 1.25 CW-ID 11/04/2015 7.0 19.05 18 338 1.99 100 305 1.13 NM <1 6 NA NA 12 <1 17 <1 13 <1 12.6 173 <0.2 180 1.12 CW-ID 04/04/2016 7.0 18.44 19 356 11.7 178 383 5.89 0 <1 <5 NA NA <5 <1 40 <1 13 <1 12.3 167 <0.2 220 1.1 CW-2D 12/02/2010 6.7 14.39 13 300 NM NM NM 20 NM <0.5 34.2 NA NA <5 NA 370 <5 102 <10 NA NA <0.1 205 NA CW-2D 04/20/2011 6.5 13.60 17 419 4.19 -35 170 13.6 NM <0.5 33.4 NA NA <5 NA 227 <5 156 <10 NA NA <0.1 208 NA CW-2D 07/12/2011 6.7 15.26 19 427 1.31 -139 66 23.8 NM <0.5 32.3 B NA NA <5 NA 522 <5 254 <10 NA NA <0.1 207 B NA CW-2D DUP 07/12/2011 6.7 15.26 19 427 1.31 -139 66 23.8 NM <0.5 30.8 B NA NA <5 NA 498 <5 258 <10 NA NA <0.1 216 B NA CW-2D 11/03/2011 6.5 14.68 14 365 0.85 -71 134 16.7 NM <0.5 31.6 NA NA <5 NA 286 <5 250 <10 NA NA <0.1 197 NA CW-2D 04/05/2012 6.5 14.14 14 329 2.53 -51 154 17.4 NM <0.5 27.4 NA NA <5 NA 347 <5 270 <10 NA NA <0.1 221 NA CW-2D 07/10/2012 6.5 15.61 20 381 1.2 -54 151 15.2 NM <0.5 24 NA NA <5 NA 392 <5 231 <10 NA NA <0.1 260 NA CW-2D 07/09/2013 6.8 14.07 22 440 1.33 98 303 5.32 NM <1 30 NA NA <5 NA 256 <1 107 <1 NA NA <0.2 260 NA CW-2D 11/13/2013 6.5 14.88 10 402 1.4 181 386 6.5 NM <1 32 NA NA <5 NA 125 <1 89 <1 NA NA <0.2 260 NA CW-2D 04/01/2014 6.3 13.30 15 396 2.4 180 385 6.7 NM <1 41 NA NA <5 NA 105 <1 169 <1 NA NA <0.2 230 NA CW-2D 07/16/2014 6.3 15.10 17 360 3.03 199 404 7.31 NM <1 36 NA NA <5 NA 124 <1 102 <1 NA NA <0.2 250 NA CW-2D 11/12/2014 6.4 14.78 16 382 2.14 173 378 6.46 NM <1 35 NA NA <5 NA 136 <1 95 <1 NA NA <0.2 230 NA CW-2D 04/14/2015 6.2 12.71 16 360 3.8 342 547 4.98 NM <1 42 NA NA <5 <1 149 <1 123 <1 17.4 NA <0.2 240 NA CW-2D 07/07/2015 6.1 13.76 18 359 2.9 162 367 9.8 NM <1 38 NA 0.084 <5 <1 278 <1 81 <1 17.6 NA <0.2 250 0.585 CW-2D 09/08/2015 6.4 13.30 18 375 1.6 172 377 9.12 0 <1 39 NA NA <1 <1 267 <1 79 <1 18.3 286 <0.2 270 0.689 CW-2D 11/04/2015 6.3 13.50 15 370 1.31 120 325 4.31 NM <1 44 NA NA 8 <1 172 <1 68 <1 18.5 258 <0.2 210 0.551 CW-2D 12/02/2015 7.1 12.62 15 540 0.32 143 348 4.73 0 <1 42 0.061 NA <1 <1 231 <1 117 <1 19.3 293 <0.2 200 0.478 CW-2D 01/06/2016 5.8 12.79 12 327 0.61 160 365 7.41 0 <1 51 0.089 NA <1 <1 332 <1 148 <1 23.1 255 <0.2 220 0.594 CW-2D 04/04/2016 6.2 13.27 22 343 2.67 159 364 7.45 0 <1 48 NA NA <5 <1 191 <1 92 <1 19 263 <0.2 240 0.377 CW-5 12/06/2010 6.9 10.69 12 397 NM NM NM 5.8 NM <0.5 55.3 NA NA <5 NA 293 <5 609 <10 NA NA <0.1 243 NA CW-5 04/21/2011 6.6 5.83 14 383 0.29 -84 121 6.23 NM <0.5 49.2 NA NA <5 NA 343 <5 583 <10 NA NA <0.1 242 NA CW-5 07/12/2011 6.6 9.61 22 377 2.55 -95 110 0.45 NM <0.5 54.1 B NA NA <5 NA 485 <5 629 <10 NA NA <0.1 253 B NA CW-5 11/04/2011 6.6 13.66 16 390 0.8 -129 76 2 NM <0.5 54.1 NA NA <5 NA 546 <5 600 <10 NA NA <0.1 <25 NA CW-5 04/05/2012 6.5 7.02 15 365 2.7 -83 122 3.13 NM <0.5 44.5 NA NA <5 NA 98.9 <5 387 <10 NA NA <0.1 230 NA CW-5 07/10/2012 6.6 12.02 20 376 0.75 -75 130 4.03 NM <0.5 47.5 NA NA <5 NA 597 <5 622 <10 NA NA <0.1 250 NA CW-5 11/06/2012 6.6 12.83 14 373 1.16 7 212 0.69 NM <0.5 52.6 NA NA <5 NA 588 <5 557 <10 NA NA <0.1 241 NA CW-5 04/10/2013 6.6 6.22 19 393 2.12 NM NM 5.54 NM <1 47 NA NA <5 NA 274 <1 549 <1 NA NA <0.2 250 NA CW-5 07/09/2013 6.4 6.96 25 375 0.59 -535 1 -330 1.68 NM <1 50 NA NA <5 NA 589 <1 595 <1 NA NA 0.361 240 NA P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment P1an\19.EG_CSASUP\Tab1es\Tab1e 1-4 Bedrock Exceedances thru CSA Round 5.xlsx Page 2 of 4 TABLE 1-4 BEDROCK GROUNDWATER EXCEEDANCES MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter PH Water Level Temp Spec Cond DO ORP Eh Turbidity Ferrous Iron Antimony Barium Chromium (VI) Chromium (VI) Speciation Chromium Cobalt Iron Lead Manganese Selenium Sodium Strontium Thallium Total Dissolved Solids Vanadium Reporting Units S.U. ft Deg C umcros mg/i mV mV NTUs mg/I ug/I ug/I ug/I ug/I ug/1 ug/1 ug/I ug/1 ug/1 ug/I mg/I ug/I ug/I mg/I ug/I 15A NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE 1* 700 0.07^ 0.07^ 10 1* 300 15 50 20 NE NE 0.2* 500 0.3* Sample ID Sample Collection Date Field Parameters Analytical Results CW-5 11/13/2013 6.8 13.46 13 416 0.5 18 223 3.5 NM <1 53 NA NA <5 NA 936 <1 706 <1 NA NA <0.2 250 NA CW-5 04/01/2014 6.8 5.53 16 429 1.9 138 343 7.3 NM <1 51 NA NA <5 NA 799 <1 650 <1 NA NA <0.2 280 NA CW-5 07/17/2014 6.5 9.32 17 395 0.41 21 226 8.63 NM <1 57 NA NA <5 NA 1080 <1 672 <1 NA NA <0.2 270 NA CW-5 11/13/2014 6.6 9.75 14 429 0.37 72 277 6.1 NM <1 58 NA NA <5 NA 988 <1 660 <1 NA NA <0.2 260 NA CW-5 04/14/2015 6.6 3.95 15 415 0.8 61 266 7.62 NM <1 54 NA NA <5 1 731 <1 696 <1 18.2 NA <0.2 270 NA CW-5 07/06/2015 6.7 6.38 22 434 0.3 -110 96 8.68 NM <1 57 NA NA <5 <1 1060 <1 785 <1 18 NA <0.2 290 <0.3 CW-5 09/09/2015 6.7 10.52 29 446 1.3 -1 204 6.24 0.5 <1 54 NA NA <1 <1 780 <1 868 <1 17.3 161 <0.2 280 <0.3 CW-5 11/03/2015 6.7 9.64 17 407 0.4 -31 175 5.79 NM <1 54 NA NA <5 <1 906 <1 694 <1 18.3 B2 156 <0.2 250 <0.3 CW-5 04/05/2016 7.0 4.97 12 417 3.04 199 404 6.52 0.25 <1 47 NA NA <5 <1 513 <1 380 <1 18.2 161 <0.2 270 <0.3 CW-6 12/01/2010 7.1 14.33 14 778 NM NM NM 10.9 NM <0.5 34.1 NA NA 7.1 NA 1220 <5 1090 <10 18 NA <0.1 445 NA CW-6 04/20/2011 6.6 13.21 16 762 0.44 -81 124 4.31 NM <0.5 34.3 NA NA <5 NA 1260 <5 1160 <10 17.3 NA <0.1 481 NA CW-6 07/12/2011 6.6 13.78 18 794 0.63 -126 79 6.53 NM <0.5 35.4 B NA NA <5 NA 1330 <5 1160 <10 18.3 B2 NA <0.1 417 NA CW-6 11/04/2011 6.8 15.31 14 753 0.87 -157 48 2.17 NM <0.5 35.5 NA NA <5 NA 1780 <5 1310 <10 18.4 NA <0.1 464 NA CW-6 04/05/2012 6.5 14.04 14 674 0.87 -96 109 1.37 NM <0.5 36.1 NA NA <5 NA 1520 <5 1270 <10 NA NA <0.1 486 NA CW-6 07/10/2012 6.7 15.04 18 870 0.74 -99 106 2.81 NM <0.5 34.4 NA NA <5 NA 1440 <5 1260 <10 NA NA <0.1 524 NA CW-6 DUP 07/10/2012 6.7 15.04 18 870 0.74 -99 106 2.81 NM <0.5 34.5 NA NA <5 NA 1480 <5 1410 <10 NA NA <0.1 531 NA CW-6 11/05/2012 6.8 16.51 14 823 0.94 -70 135 2.76 NM <0.5 36.6 NA NA <5 NA 1780 <5 1280 <10 NA NA <0.1 528 NA CW-6 04/10/2013 6.6 14.02 19 927 0.36 -103 102 1.57 NM <1 38 NA NA <5 NA 1720 <1 1440 <1 NA NA <0.2 550 NA CW-6 07/09/2013 6.6 13.34 19 882 0.44 -110 95 0.99 NM <1 40 NA NA <5 NA 1580 <1 1400 <1 NA NA <0.2 550 NA CW-6 DUP 07/09/2013 6.6 13.34 19 882 0.44 -110 95 0.99 NM <1 40 NA NA <5 NA 1540 <1 1380 <1 NA NA <0.2 550 NA CW-6 11/13/2013 6.8 14.98 13 857 0.5 -46 159 7 NM <1 40 NA NA <5 NA 1870 <1 1390 <1 NA NA <0.2 520 NA CW-6 DUP 11/13/2013 6.8 14.98 13 857 0.5 -46 159 7 NM <1 40 NA NA <5 NA 1740 <1 1360 <1 NA NA <0.2 520 NA CW-6 04/01/2014 6.6 12.35 16 862 0.4 13 218 2.3 NM <1 39 NA NA <5 NA 1330 <1 1300 <1 NA NA <0.2 550 NA CW-6 07/16/2014 6.6 13.69 16 827 0.49 -18 187 5.22 NM <1 41 NA NA <5 NA 1390 <1 1350 <1 NA NA <0.2 550 NA CW-6 DUP 07/16/2014 6.6 13.69 16 827 0.49 -18 187 5.22 NM <1 41 NA NA <5 NA 1380 <1 1350 <1 NA NA <0.2 550 NA CW-6 11/12/2014 6.6 14.59 16 802 0.23 -5 200 0.95 NM <1 42 NA NA <5 NA 1410 <1 1380 <1 NA NA <0.2 520 NA CW-6 04/14/2015 6.6 10.54 15 812 0.2 -127 78 6.33 NM <1 42 NA NA <5 <1 1370 <1 1300 1.48 37.6 NA <0.2 540 NA CW-6 07/06/2015 6.7 12.12 17 890 0.4 -188 17 1.72 <0.5 <1 48 NA NA <5 <1 2040 <1 1450 <1 38.9 NA <0.2 560 <0.3 CW-6 DUP 07/06/2015 6.7 12.12 17 890 0.4 -188 17 1.72 NM <1 49 NA NA <5 <1 2060 <1 1470 <1 39.7 NA <0.2 570 <0.3 CW-6 09/09/2015 6.5 13.73 17 865 0.3 -51 154 2.81 2 <1 45 NA NA <1 <1 1890 <1 1460 <1 35.9 328 <0.2 530 0.341 CW-6 11/04/2015 6.7 14.65 16 872 0.32 -91 114 0.75 NM <1 46 NA NA <5 <1 2050 <1 1400 <1 38.1 334 <0.2 520 <0.3 CW-6 01/06/2016 7.1 12.50 13 815 0.47 -26 179 2.48 NM <1 41 <0.03 NA <1 <1 1790 <1 1440 <1 39 329 <0.2 520 <0.3 CW-6 04/04/2016 6.8 10.44 17 881 0.31 -101 104 3.2 1.5 <1 45 NA NA <5 <1 1860 <1 1420 <1 38.4 338 <0.2 540 <0.3 CW-6 DUP 04/04/2016 6.8 10.44 17 881 0.31 -101 104 3.2 1.5 <1 46 NA NA <5 <1 1900 <1 1450 <1 39 344 <0.2 560 <0.3 MW-2 03/19/2015 5.8 26.11 11 339 0.32 183 388 33.9 0.5 <1 55 NA NA <1 2.78 756 <1 833 <1 27.7 184 <0.2 200 1.68 MW-2 09/08/2015 5.8 27.27 23 329 0.3 68 273 9.29 1 <1 79 NA NA <1 4.86 1190 <1 1730 <1 25.7 210 <0.2 210 0.741 MW-2 12/01/2015 5.6 27.06 15 322 0.41 86 291 8.71 1 <1 74 <0.03 NA <1 5.2 1350 <1 1610 <1 24.6 212 <0.2 320 0.747 MW-2 01/06/2016 5.9 26.15 13 270 0.23 122 327 7.56 0.5 <1 59 <0.03 NA <1 3.81 813 <1 1120 <1 26.7 189 <0.2 200 0.678 MW-3BR 03/14/2015 NM NM NM NM NM NM NM NM NM <1 46 NA NA <1 <1 648 <1 731 <1 20.4 417 <0.2 660 0.781 MW-3BR 09/08/2015 6.9 16.96 23 954 0.5 -89 116 3.8 1 <1 48 NA NA <1 <1 729 <1 694 <1 21.8 414 <0.2 780 0.494 MW-3BR 12/02/2015 7.2 16.88 17 883 0.51 -103 102 1.91 NM <1 46 <0.03 NA <1 <1 171 <1 737 <1 24 396 <0.2 590 <0.3 MW-3BR 01/07/2016 7.1 16.30 13 913 0.63 -25 180 0.74 0.5 <1 42 <0.03 NA <1 <1 401 <1 635 <1 21.9 394 <0.2 550 <0.3 MW-4 03/20/2015 6.3 25.98 9 291 5.42 242 447 10.3 0 <1 6 NA NA <1 <1 70 <1 15 <1 17.8 99 <0.2 190 0.891 MW-4 09/09/2015 6.5 28.45 24 319 0.9 54 259 4.11 0 <1 11 NA NA <1 <1 19 <1 7 <1 17.3 102 <0.2 210 0.997 MW-4 12/01/2015 6.3 28.70 1 11 274 0.93 107 312 1.29 1 <1 7 0.038 NA <1 <1 1 22 1 <1 <5 <1 18.4 87 <0.2 210 0.664 P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment P1an\19.EG_CSASUP\Tab1es\Tab1e 1-4 Bedrock Exceedances thru CSA Round 5.xlsx Page 3 of 4 TABLE 1-4 BEDROCK GROUNDWATER EXCEEDANCES MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter pH Water Level Temp Spec Cond DO ORP Eh Turbidity Ferrous Iron Antimony Barium Chromium (VI) Chromium (VI) Speciation Chromium Cobalt Iron Lead Manganese Selenium Sodium Strontium Thallium Total Dissolved Solids Vanadium Reporting Units S.U. ft Deg C umcros mg/I mV mV NTUs mg/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I mg/I ug/I ug/I mg/I ug/I 15A NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE 1* 700 0.07^ 0.07^ 10 1* 300 15 50 20 NE NE 0.2* 500 0.3* Sample ID Sample Collection Date Field Parameters Analytical Results MW-4 01/06/2016 6.3 26.20 11 283 0.57 92 297 9.25 0 <1 9 0.16 NA 4.21 <1 141 <1 79 <1 18.9 95 <0.2 210 0.803 MW-5BR 03/11/2015 7.1 6.30 14 491 0.29 55 214 4.95 2.5 <1 31 NA NA <1 <1 4240 <1 1740 <1 17.2 209 <0.2 380 <0.3 MW-5BR 09/09/2015 7.2 11.50 27 623 0.6 -116 90 4.54 3 <1 34 NA NA <1 <1 4110 <1 1800 <1 16.5 214 <0.2 410 0.367 MW-5BR 12/02/2015 7.2 9.72 15 602 0.5 -132 73 2.82 7 <1 39 <0.03 NA <1 <1 8230 <1 1860 <1 17.3 219 <0.2 370 <0.3 MW-5BR 01/07/2016 7.2 6.93 12 604 1.84 -98 107 0.92 4 <1 39 <0.03 NA <1 <1 9690 <1 1880 <1 17.9 205 <0.2 360 <0.3 MW-7BR 06/19/2015 7.4 7.42 25 470 0.34 -200 5 4.09 <0.5 <1 140 NA NA <1 <1 339 <1 263 <1 18.2 988 <0.2 270 <0.3 MW-7BR 09/11/2015 7.3 10.19 20 826 0.3 -157 48 1.33 1 <1 140 NA NA <1 <1 618 <1 227 <1 17 M4 985 <0.2 260 <0.3 MW-7BR 12/02/2015 7.4 9.57 15 441 0.58 -93 112 2.55 0.1 <1 156 <0.03 NA <1 <1 551 <1 224 <1 16.5 1100 <0.2 250 <0.3 MW-7BR 01/06/2016 8.0 8.39 12 402 1.01 -101 104 1.19 0.1 <1 150 <0.03 NA <1 <1 422 <1 210 <1 17.6 1020 <0.2 260 <0.3 MW-8BR 06/18/2015 6.6 34.38 18 858 0.3 -149 56 4.33 2.5 <1 66 NA NA <1 <1 2200 <1 2680 <1 43.8 425 <0.2 550 <0.3 MW-8BR 09/11/2015 6.5 35.36 18 836 0.1 -37 168 9.07 1.5 <1 42 NA NA 14.1 1.08 1530 1 1390 <1 3.6 393 <0.2 540 0.512 MW-8BR 12/02/2015 6.4 35.80 16 706 0.2 29 234 4.6 0.5 <1 39 <0.03 NA <1 <1 468 <1 911 <1 34.1 400 <0.2 500 <0.3 MW-8BR 01/06/2016 6.8 35.98 14 703 0.28 40 245 9.8 0.5 <1 34 <0.03 NA 4.73 <1 417 <1 681 <1 33.4 372 <0.2 480 0.432 MW-9BR 06/18/2015 6.3 24.89 24 226 0.7 2 207 45.6 NM <1 30 NA NA 3.4 <1 3000 <1 809 <1 13.3 109 <0.2 220 4.17 MW-9BR 09/11/2015 6.1 28.92 22 220 1.6 66 271 17.6 0.25 <1 16 NA NA <1 <1 1400 <1 694 <1 17.1 76 <0.2 170 1.94 MW-9BR 12/02/2015 5.8 26.79 15 131 0.33 128 333 62.1 0 <1 9 0.045 NA 3.72 <1 3690 <1 451 <1 12.9 48 <0.2 220 5.41 MW-16BR 06/23/2015 8.7 3.75 25 239 0.89 -191 14 4.66 NM <1 11 NA 0.017 <1 <1 80 <1 30 <1 23.9 112 <0.2 170 2.79 MW-16BR 09/09/2015 8.8 4.32 22 235 0.5 -172 33 1.85 0 1.39 7 NA 0.013 j <1 <1 22 <1 16 <1 28.5 80 <0.2 170 2 MW-16BR 12/04/2015 9.3 3.46 13 228 0.3 -182 23 4.28 0 0.94 6.2 <0.03 NA <0.5 <0.5 58 0.1 17 <0.5 31.8 69 <0.1 209 1.2 MW-16BR 01/07/2016 9.0 3.29 7 232 0.78 -139 66 5.11 0 1.34 9 <0.03 NA <1 <1 126 <1 32 <1 30.3 74 <0.2 150 1.06 NCDEQ Sampled Water Supply Wells MY-3 (Vendor) 03/10/2015 5.7 NM 16 399 9.24 NM NM 29.7 NM <3 70.2 <20 NA <10 <5 1750 21.6 20.9 <10 30.7 436 <1 293 3.03 MY-3 (Duke) 03/10/2015 NM NM NM NM NM NM NM NM NM <1 74 NA NA <5 <1 1680 22.6 23 1.79 34.9 469 <0.2 260 2.44 MY-3 (Vendor) 08/19/2015 5.6 NM 18 261 5.48 NM NM <1 NM <0.5 60.4 0.13 NA 0.6 <0.5 <50 5.9 8 1.3 30.7 391 <0.1 226 <1 MY-5 (Vendor) 05/04/2015 7.1 NM 16 572 1.8 NM NM 1.5 NM <5 54.5 <0.03 NA <5 <5 953 2.7 517 <5 <0.5 621 <1 349 <10 MY-5 (Duke) 05/04/2015 NM NM NM NM NM NM NM NM NM <1 61 NA NA 5 <1 1300 2.76 508 <1 23.7 673 <0.2 340 3.15 MY-7 (Vendor) 09/01/2015 6.1 NM 18 85 7.07 NM NM <1 NM <0.5 30 0.63 NA 0.86 <0.5 <50 1.8 0.78 <0.5 9.66 106 <0.1 88 2.5 MY-7 (Duke) 09/01/2015 NM NM NM NM NM NM NM NM NM <1 32 NA NA <5 <1 <10 1.73 <5 <1 9.42 113 <0.2 110 2.38 Prepared by: BER Checked by: JAW Notes: - Bold highlighted concentration indicates exceedance of the 15A NCAC 02L Standard, Appendix 2, April 1, 2013 ug/I = microgram per liter Deg C = Degree Celsius Temp = Temperature mg/I = milligrams per liter DUP = Duplicate ND = Not detected above reporting limit umhos/cm = micro mhos per centimeter DO = Dissolved Oxygen NM = Not Measured NTU = Nephelometric Turbidity Unit ORP = Oxidation Reduction Potential NA = Not Analyzed S.U. = Standard Unit Spec Cond = Specific Conductance NE = Not Established mV = millivolts Eh = Redox Potential ft = feet B = Data flagged due to a detection in the field blank * Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April, 1, 2013. < = concentration not detected at or above reporting limit ^ = NC DHHS Health Screening Level. M1 = Matrix spike recovery was high: the associated Laboratory Control Spike (LCS) was acceptable. j = indicates concentration reported below Practical Quantitation Limit (PQL), but above Method Detection Limit (MDL) and therefore concentration is estimated. Values indicated in red associated with sample turbidity greater than 10 NTU. P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-4 Bedrock Exceedances thru CSA Round 5.xlsx Page 4 of 4 TABLE 1-5 WATER LEVEL DATA - DECEMBER 2015 AND JANUARY 2016 MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Well Identification Date Measured Measured Well Depth (Feet TOC) Measured Depth to Water (Feet TOC) Water Level (Feet MSL) BG-1 12/3/2015 56.35 30.30 509.81 BG-2 12/3/2015 48.08 31.88 510.78 CW-1 12/3/2015 28.84 18.05 471.83 CW-1D 12/3/2015 43.67 19.36 471.60 CW-2 12/3/2015 20.48 12.35 376.65 CW-2D 12/3/2015 58.86 12.78 376.75 CW-3 12/3/2015 NM 17.20 420.48 CW-4 12/3/2015 43.08 22.35 428.96 CW-5 12/3/2015 NM 7.78 501.82 CW-6 12/3/2015 80.50 13.84 448.99 MW-2 12/3/2015 50.17 27.11 434.12 MW-3 12/3/2015 20.26 6.41 377.59 MW-4 12/3/2015 59.06 28.23 494.54 MW-3BR 12/3/2015 76.53 17.14 421.10 MW-5BR 12/3/2015 65.72 9.62 501.78 MW-6BR iezometer 12/3/2015 100.34 13.89 450.10 MW-7D 12/3/2015 62.67 11.36 442.58 MW-7BR 12/3/2015 79.46 9.72 443.78 MW-8S iezometer 12/3/2015 30.16 29.86 437.01 MW-8D iezometer 12/3/2015 38.24 34.60 432.29 MW-8BR 12/3/2015 67.00 36.06 430.93 MW-9BR 12/3/2015 60.63 26.57 468.82 MW-10BR 12/3/2015 57.55 13.30 500.09 MW-11BR 12/3/2015 98.80 36.70 490.66 MW-12S 12/3/2015 50.40 32.15 555.23 MW-12D 12/3/2015 96.55 32.50 555.52 MW-13BR 12/3/2015 100.95 31.55 497.28 MW-14BR 12/3/2015 37.07 16.87 503.88 MW-15BR iezometer 12/4/2015 62.90 54.40 406.52 MW-16S 12/4/2015 10.81 3.34 367.77 MW-16D 12/4/2015 41.74 3.26 367.95 MW-16BR 12/4/2015 62.49 3.46 367.84 ABMW-1 12/3/2015 15.65 2.58 481.23 ABMW-2 12/3/2015 42.48 10.83 483.07 ABMW-2BR 12/3/2015 107.64 11.26 482.59 ABMW-3 12/3/2015 43.50 16.96 483.21 ABMW-3S 12/3/2015 63.16 17.18 483.12 ABMW-4 12/3/2015 56.10 6.13 485.31 ABMW-4D 12/3/2015 65.75 6.26 485.24 ABMW-4BR 12/3/2015 111.50 6.15 485.46 Prepared by: EMB Checked by: JAW Notes: nm = Not measured TOC= Top of Casing MSL = Mean Sea Level P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-5 Water Level Data Dec 2015 Jan 2016.xlsx Page 1 of 2 TABLE 1-5 WATER LEVEL DATA - DECEMBER 2015 AND JANUARY 2016 MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Well Identification Date Measured Measured Well Depth (Feet TOC) Measured Depth to Water (Feet TOC) Water Level (Feet MSL) BG-1 1/8/2016 56.35 29.36 510.75 BG-2 1/8/2016 48.08 31.23 511.43 CW-1 NM 28.84 NM -- CW-1D NM 43.67 NM -- CW-2 1/6/2016 20.48 12.39 376.61 CW-2D 1/6/2016 58.86 12.79 376.74 CW-3 NM NM NM -- CW-4 NM 43.08 NM -- CW-5 NM NM NM -- CW-6 1/6/2016 80.50 12.50 450.33 MW-2 1/6/2016 50.17 26.15 435.08 MW-3 1/6/2016 20.26 6.43 377.57 MW-4 1/6/2016 59.06 26.20 496.57 MW-03BR 1/7/2016 76.53 16.30 421.94 MW-05BR 1/7/2016 65.72 6.93 504.47 MW-06BR iezometer NM 100.34 NM -- MW-07D 1/6/2016 62.67 9.86 444.08 MW-07BR 1/6/2016 79.46 8.39 445.11 MW-08S iezometer NM 30.16 NM -- MW-08D iezometer NM 38.24 NM -- MW-08BR 1/6/2016 67.00 35.98 431.01 MW-09BR 1/6/2016 60.63 22.64 472.75 MW-10BR 1/7/2016 57.55 13.08 500.31 MW-11BR 1/7/2016 98.80 36.18 491.18 MW-12S 1/7/2016 50.40 31.69 555.69 MW-12D 1/7/2016 96.55 31.95 556.07 MW-13BR 1/7/2016 100.95 30.36 498.47 MW-14BR 1/7/2016 37.07 16.31 504.44 MW-15BR iezometer NM 62.90 NM -- MW-16S 1/7/2016 10.81 3.25 367.86 MW-16D 1/7/2016 41.74 3.04 368.17 MW-16BR 1/7/2016 62.49 3.29 368.01 M W-17BR 1/26/2016 123.50 35.22 455.33 ABMW-01 1/7/2016 15.65 2.56 481.25 ABMW-02 1/5/2016 42.48 10.75 483.15 ABMW-02BR 1/5/2016 107.64 10.86 482.99 ABMW-02BRL 1/26/2016 168.57 11.46 482.51 ABMW-03 1/5/2016 43.50 16.62 483.55 ABMW-03S 1/5/2016 63.16 16.95 483.35 ABMW-04 1/5/2016 56.10 5.96 485.48 ABMW-04D 1/5/2016 1 65.75 1 6.10 485.40 ABMW-04BR 1/5/2016 111.50 1 5.43 486.18 Prepared by: RKD Checked by: JAW Notes: nm = Not measured TOC = Top of Casing MSL = Mean Sea Level P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-5 Water Level Data Dec 2015 Jan 2016.xlsx Page 2 of 2 TABLE 1-6 SUMMARY OF FOURTH ROUND SAMPLING (JANUARY 2016) ANALYTICAL DATA MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter pH Water Level Temp Spec Cond DO ORP Eh Turbidity Ferrous Iron Alkalinity Aluminum Antimony Arsenic Barium Beryllium Bi- carbonate Alkalinity Boron Cadmium Calcium Carbonate Alkalinity Chloride Chromium (Hexavalent) Chromium TOT TOT TOT TOT TOT TOT TOT TOT TOT Reporting Units S.U. ft Deg C umhos/cm mg/I my my NTUs mg/I mg/I ug/I ug/I ug/I ug/I ug/I mg/I ug/I ug/I mg/I mg/I mg/I ug/I ug/I 15A NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE NE NE 1 10 700 4 NE 700 2 NE NE 250 0.07 10 Sample ID Collection SampleDate I Field Parameters Analytical Results Ash Pore Water ABMW-1 01/07/2016 8.3 2.56 11 610 0.42 -149 56 5.76 0 297 372 18.8 498 502 <1 297 5840 <1 54.4 <5 15 <0.03 <1 ABMW-2 01/05/2016 7.4 10.75 2 651 1.23 -31 174 1.34 0.5 335 32 <1 394 173 <1 335 8440 <1 71.9 <5 13 <0.03 <1 ABMW-3 01/05/2016 7.0 16.62 6 618 0.49 -63 142 0.61 4 181 98 <1 79.8 292 <1 181 1800 <1 62.5 <5 62 <0.03 1.29 ABMW-4 01/05/2016 7.0 5.96 6 870 0.28 -102 103 2 0 425 39 <1 708 472 <1 425 5360 <1 121 <5 12 <0.03 <1 Alluvial MW-3 01/06/2016 5.9 6.43 11 322 0.81 370 575 0.66 0 71 7 <1 <1 57 <1 71 896 <1 26.2 <5 46 0.17 M3 <1 MW-3 DUP 01/06/2016 5.9 6.43 11 322 0.81 370 575 0.66 0 69.5 7 <1 <1 57 <1 69.5 889 <1 26.3 <5 46 0.17 <1 MW-16S 01/07/2016 6.4 3.25 7 146 3.46 99 304 9.39 0.5 49 105 <1 <1 45 <1 49 <50 <1 9.53 <5 14 0.083 4.57 Saprolite ABMW-3S 01/05/2016 5.4 16.95 7 128 0.62 112 317 1.59 1.5 40.4 42 <1 1.35 20 <1 40.4 1220 <1 4.06 <5 12 <0.03 <1 MW-12S 01/07/2016 5.8 31.69 10 111 2.86 185 390 9.89 0 11.1 220 <1 <1 11 <1 11.1 <50 <1 1.96 <5 3.1 0.038 1.43 Transition Zone ABMW-4D 01/05/2016 6.0 6.10 10 1237 0.8 -102 103 9.26 NM 596 253 <1 60.9 1080 <1 596 4010 <1 134 <5 12 <0.03 <1 BG-2 01/08/2016 6.4 31.23 17 588 0.9 -16 189 1.98 0.5 263 80 <1 <1 58 <1 263 <50 <1 57.3 <5 33 <0.03 <1 CW-2 01/06/2016 5.1 12.39 13 210 2.62 189 394 0.58 0 <5 28 <1 <1 99 <1 <5 539 <1 12.9 <5 40 0.087 <1 MW-7D 01/06/2016 6.8 9.86 12 553 0.78 70 275 3.88 0 181 52 <1 <1 19 <1 181 <50 <1 54.1 <5 73 <0.03 <1 MW-12D 01/07/2016 6.1 31.95 15 118 3.1 136 341 9.26 NM 53.5 678 <1 <1 22 <1 53.5 <50 <1 11.7 <5 4.5 0.52 M1 2.99 MW-16D 01/07/2016 7.1 3.04 13 269 2.1 157 362 4.8 0 74.3 192 <1 <1 7 <1 74.3 <50 <1 25.3 <5 9.8 0.097 <1 MW-16D DUP Ol/07/2016 7.1 3.04 13 269 2.1 157 362 4.8 0 77.6 196 <1 <1 7 <1 77.6 <50 <1 25.5 <5 9.8 0.1 <1 Bedrock ABMW-2BR 01/05/2016 7.4 10.86 3 543 1.34 -126 79 3.53 2 284 75 <1 2.02 123 <1 284 <50 <1 75.4 <5 26 <0.03 <1 ABMW-2BRL 02/02/2016 6.9 11.48 17 506 2.47 136 341 2.36 0 238 20 <1 <1 58 <1 238 <50 <1 73.7 <5 21 0.052 <1 ABMW-4BR 01/05/2016 7.6 5.43 7 531 2.93 -240 -35 1.36 0 243 80 <1 <1 110 <1 243 <50 <1 75.6 <5 4.9 <0.03 <1 BG-1 01/08/2016 5.1 29.36 15 147 1.48 67 272 5.78 0 51.1 227 <1 <1 87 <1 51.1 <50 <1 12.6 <5 12 0.2 <1 CW-2D 01/06/2016 5.8 12.79 12 327 0.61 160 365 7.41 0 25.4 724 <1 <1 51 <1 25.4 484 <1 25.4 <5 56 0.089 <1 CW-6 01/06/2016 7.1 12.50 13 815 0.47 -26 179 2.48 NM <5 M1 40 <1 <1 41 <1 <5 <50 <1 107 <5 100 <0.03 <1 MW-2 01/06/2016 5.9 26.15 13 270 0.23 122 327 7.56 0.5 95.5 531 <1 <1 59 <1 95.5 <50 <1 17.8 <5 16 <0.03 <1 MW-3BR 01/07/2016 7.1 16.30 13 913 0.63 -25 180 0.74 0.5 223 168 <1 <1 42 <1 223 <50 <1 141 <5 160 <0.03 <1 MW-4 01/06/2016 6.3 26.20 11 283 0.57 92 297 9.25 0 93.2 232 <1 <1 9 <1 93.2 <50 <1 26.2 <5 7.5 0.16 4.21 MW-5BR 01/07/2016 7.2 6.93 12 604 1.84 -98 107 0.92 4 212 130 <1 <1 39 <1 212 <50 <1 89.8 <5 66 <0.03 <1 MW-7BR 01/06/2016 8.0 8.39 12 402 1.01 -101 104 1.19 0.1 218 17 <1 <1 150 <1 218 <50 <1 60.1 <5 12 <0.03 <1 MW-8BR 01/06/2016 6.8 35.98 14 703 0.28 40 245 9.8 0.5 156 185 <1 <1 34 <1 156 <50 <1 77.5 <5 130 <0.03 4.73 MW-10BR 01/07/2016 6.1 13.08 13 449 0.53 50 255 1.64 0 103 62 <1 <1 <5 <1 103 <50 <1 28.8 <5 21 <0.03 <1 MW-11BR 01/07/2016 9.8 36.18 14 214 1.2 -40 165 5.04 0 64.8 170 1 1.9 1.02 24 <1 36.4 <50 1 <1 18.7 28.3 16 12.2 1 15.1 MW-13BR 01/07/2016 7.3 30.36 11 544 0.5 -75 130 7.79 1.5 223 M1 230 <1 <1 42 <1 223 <50 <1 73.3 <5 45 <0.03 7.65 MW-14BR 01/07/2016 6.7 16.31 11 258 2.73 64 269 2.45 0 94.8 163 <1 <1 17 <1 94.8 <50 <1 13 <5 13 <0.03 <1 MW-16BR 01/07/2016 9.0 3.29 7 232 0.78 -139 66 5.11 0 103 136 1.34 <1 9 <1 103 <50 <1 18.3 <5 7.7 <0.03 <1 Notes: = - Bold highlighted concentration indicates exceedance of the 15A NCAC 02L Standard, Appendix 2, April 1, 2013. Spec Cond = Specific Conductance Deg C = Degrees Celsius NTU = Nephelometric turbidity unit DUP = Duplicate umhos/cm = Micro mhos per centimeter NE = Not established S.U. = Standard Unit mg/I = Milligram per liter Temp = Temperature ft = Feet my = Millivolts TOT= Total NA = Not analyzed ug/I = Microgram per liter mg - N/L = Milligram nitrogen per liter < = Concentration not detected at or above the reporting limit = Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013. M1 = Matrix spike recovery was high: the associated Laboratory Control Spike (LCS) was acceptable. DO = Dissolved oxygen ORP = Oxidation -Reduction Potential Eh = Oxidation Potential NM = Not measured Prepared by: BER Checked by: JAW P:\Duke Energy Progress. 1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-6 Summ 4th Round Sampling Jan 2016 Data.xlsx Page 1 of 2 TABLE 1-6 SUMMARY OF FOURTH ROUND SAMPLING (JANUARY 2016) ANALYTICAL DATA MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter Cobalt Copper Iron Lead Magnesium Manganese Mercury Methane Molybdenum Nickel Nitrate (as N) Potassium Selenium Sodium Strontium Sulfate Sulfide Thallium Total Dissolved Solids Total Organic Carbon Total Suspended Solids Vanadium Zinc TOT TOT TOT TOT TOT TOT TOT TOT TOT TOT TOT TOT TOT TOT TOT TOT Reporting Units ug/I ug/I ug/I ug/I mg/I ug/I ug/I ug/I ug/I ug/I mg-N/L mg/I ug/I mg/I ug/I mg/I mg/I ug/I mg/I mg/I mg/I ug/I ug/I 15A NCAC 02L Standard 1 1000 300 15 NE 50 1 NE NE 100 10 NE 20 NE NE 250 NE 0.2 500 NE NE 0.3 1000 Sample ID Collection SampleDate I Analytical Results Ash Pore Water ABMW-1 01/07/2016 2.06 <1 724 <1 32.3 815 <0.05 3680 286 1.36 <0.01 22.8 <1 17.8 1790 24 <0.1 0.67 340 4 <5 98.7 <5 ABMW-2 01/05/2016 <1 <1 502 <1 20 1090 <0.05 17400 1130 <1 0.011 18.3 <1 35.2 1610 20 <0.1 <0.2 440 9.4 <5 1.42 <5 ABMW-3 01/05/2016 <1 <1 26200 <1 13.7 1210 <0.05 7850 10.6 <1 0.011 12.7 <1 10.3 1660 3.7 <0.1 <0.2 310 3 43 0.603 <5 ABMW-4 01/05/2016 1.19 <1 2510 <1 33.5 1030 <0.05 8000 418 <1 0.011 22.8 <1 11.9 2540 44 <0.1 <0.2 550 2.6 8 1.88 <5 Alluvial MW-3 01/06/2016 <1 <1 <10 <1 8.75 1420 <0.05 <10 <1 2.82 0.055 2.13 <1 22.8 328 22 <0.1 M1 <0.2 200 0.919 <5 <0.3 <5 MW-3 DUP 01/06/2016 <1 <1 <10 <1 8.84 1420 <0.05 <10 <1 3.01 0.056 2.12 <1 22.7 326 22 <0.1 <0.2 180 0.886 <5 <0.3 <5 MW-16S 01/07/2016 2.11 <1 520 <1 3.6 252 <0.05 <10 2.48 3.83 0.015 1.64 <1 15.6 113 4.8 <0.1 <0.2 86 0.316 <5 <0.3 14 Saprolite ABMW-3S 01/05/2016 3.42 <1 4340 <1 0.863 531 <0.05 108 <1 1.19 <0.01 1.03 <1 17.1 78 0.24 <0.1 <0.2 97 0.498 <5 <0.3 <5 MW-12S 01/07/2016 <1 <1 178 <1 0.753 68 <0.05 <10 <1 1.6 0.599 1.58 <1 4.76 18 1.4 <0.1 <0.2 35 1.6 <5 <0.3 157 Transition Zone ABMW-4D 01/05/2016 3.95 <1 72100 <1 38 6650 <0.05 17900 39.8 <1 0.015 18.4 <1 18.2 2070 0.94 <0.1 <0.2 630 6.5 120 6.01 <5 BG-2 01/08/2016 <1 1.21 471 <1 12.6 196 <0.05 477 <1 <1 <0.01 3.4 <1 50.6 350 5.5 <0.1 <0.2 370 1.3 <5 4.2 <5 CW-2 01/06/2016 <1 <1 11 <1 6.7 173 <0.05 <10 <1 1.49 0.019 1.79 <1 12.9 177 35 <0.1 <0.2 130 1.2 <5 <0.3 7 MW-7D 01/06/2016 <1 <1 154 <1 22.9 69 <0.05 <10 <1 <1 <0.01 1.98 <1 32.3 417 11 <0.1 <0.2 340 1.2 <5 0.757 <5 MW-12D 01/07/2016 <1 1.54 968 <1 3.28 131 <0.05 <10 <1 2.23 0.139 1.39 <1 8.76 87 1.1 <0.1 <0.2 82 0.184 47 1.65 5 MW-16D 01/07/2016 <1 <1 203 <1 5.06 28 <0.05 <10 5.86 <1 3.1 1.94 <1 9.62 161 7.3 <0.1 <0.2 130 <0.1 7 0.678 <5 MW-16D DUP 01/07/2016 <1 <1 200 <1 5.1 27 <0.05 <10 5.95 <1 3.2 1.92 <1 9.56 159 7.3 <0.1 <0.2 140 <0.1 7 0.598 <5 Bedrock ABMW-2BR 01/05/2016 <1 <1 1100 <1 12.4 237 <0.05 288 3.26 <1 <0.01 5.65 <1 29.3 1090 1.3 <0.1 <0.2 350 1.3 6 0.315 16 ABMW-2BRL 02/02/2016 <1 <1 106 <1 11.4 161 <0.05 <10 2.62 <1 <0.01 6.59 <1 17.5 2260 11 <0.1 <0.2 310 0.758 <5 0.45 <5 ABMW-4BR 01/05/2016 <1 2.09 295 <1 5.36 364 <0.05 1000 3.94 <1 <0.01 8.53 <1 21.7 1780 21 3.9 <0.2 300 1.1 6 0.438 <5 BG-1 01/08/2016 <1 <1 272 <1 3.36 11 <0.05 <10 <1 1.24 0.643 1.39 <1 11.9 166 0.24 <0.1 <0.2 130 0.558 <5 3.94 <5 CW-2D 01/06/2016 <1 <1 332 <1 6.84 148 <0.05 <10 <1 1.01 0.04 2.7 <1 23.1 255 43 <0.1 <0.2 220 0.538 13 0.594 26 CW-6 01/06/2016 <1 <1 1790 <1 22.1 1440 <0.05 90.8 3.55 1.1 0.182 10.4 <1 39 329 41 <0.1 <0.2 520 1.7 <5 <0.3 <5 MW-2 01/06/2016 3.81 <1 813 <1 7.34 1120 <0.05 802 <1 2.68 0.119 4.74 <1 26.7 189 18 <0.1 <0.2 200 1.5 <5 0.678 <5 MW-3BR 01/07/2016 <1 <1 401 <1 11.7 635 <0.05 <10 1.14 <1 0.012 7.58 <1 21.9 394 9.9 <0.1 <0.2 1 550 1.7 <5 <0.3 <5 MW-4 01/06/2016 <1 1.66 141 <1 7.54 79 <0.05 <10 2.8 3.06 0.322 5.8 <1 18.9 95 38 <0.1 <0.2 210 0.717 <5 0.803 53 MW-5BR 01/07/2016 <1 <1 9690 <1 6.84 1880 <0.05 912 1.61 <1 0.154 6 <1 17.9 205 0.57 <0.1 <0.2 360 2.4 26 <0.3 <5 MW-7BR 01/06/2016 <1 <1 422 <1 13.5 210 <0.05 59.7 2.98 <1 0.098 4.3 <1 17.6 1020 2.3 <0.1 <0.2 260 0.854 <5 <0.3 <5 MW-8BR 01/06/2016 <1 <1 417 <1 23.3 681 <0.05 14.4 3.54 4.24 0.123 6.02 <1 33.4 372 37 <0.1 <0.2 480 1.4 6 0.432 5 MW-10BR 01/07/2016 <1 <1 33 <1 13.1 103 <0.05 <10 <1 1.76 0.017 4.15 <1 39.5 195 90 <0.1 <0.2 300 1.8 <5 1.68 <5 MW-11BR 01/07/2016 <1 3.96 98 <1 3.51 17 1<0.05 <10 7.72 <1 0.272 7.93 <1 16.6 253 16 <0.1 <0.2 130 0.835 <5 12.7 <5 MW-13BR 01/07/2016 <1 <1 2550 <1 12.9 519 <0.05 25.9 5.81 4.98 <0.01 5.12 <1 23.7 389 15 <0.1 <0.2 330 0.647 9 <0.3 37 MW-14BR 01/07/2016 <1 1.21 98 <1 2.36 199 <0.05 <10 4.56 <1 0.384 4.49 <1 37.4 131 10 <0.1 <0.2 180 0.855 <5 2.45 <5 MW-16BR 01/07/2016 <1 <1 126 <1 2.09 32 <0.05 <10 42.6 <1 <0.01 2.2 <1 30.3 74 6.2 1.2 <0.2 150 9.7 12 1.06 1 <5 Notes: = - Bold highlighted concentration indicates exceedance of the 15A NCAC 02L Standard, Appendix 2, April 1, 2013. Spec Cond = Specific Conductance Deg C = Degrees Celsius NTU = Nephelometric turbidity unit DUP = Duplicate umhos/cm = Micro mhos per centimeter NE = Not established S.U. = Standard Unit mg/I = Milligram per liter Temp = Temperature ft = Feet my = Millivolts TOT= Total NA = Not analyzed ug/I = Microgram per liter mg - N/L = Milligram nitrogen per liter < = Concentration not detected at or above the reporting limit = Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013. M1 = Matrix spike recovery was high: the associated Laboratory Control Spike (LCS) was acceptable. DO = Dissolved oxygen ORP = Oxidation -Reduction Potential Eh = Oxidation Potential NM = Not measured Prepared by: BER Checked by: JAW P:\Duke Energy Progress. 1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-6 Summ 4th Round Sampling Jan 2016 Data.xlsx Page 2 of 2 TABLE 1-7 SUMMARY OF ANALYTICAL RESULTS FROM SITE BACKGROUND WELLS THROUGH APRIL 2016 MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter PH Water Level Temp Spec Cond DO ORP Eh Turbidity Ferrous Iron Alkalinity Aluminum Aluminum Aluminum Antimony Antimony Antimony Arsenic Arsenic Arsenic Barium Barium Barium Beryllium Beryllium Beryllium Bi- carbonate Alkalinity Boron Boron Boron Cadmium Cadmium Cadmium Calcium Carbonate Alkalinity DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT DIS DIS (01u) TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT TOT Reporting Units S.U. ft Deg C u/ch os mg/I mV mV NTUs mg/I mg/1 ug/1 ug/1 ug/1 ug/l ug/1 ug/1 ug/I ug/1 ug/1 ug/I ug/1 ug/1 ug/1 ug/1 ug/I mg/1 ug/I ug/1 ug/1 ug/1 ug/I ug/I mg/1 mg/1 15A NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE NE NE NE NE NE NE 1* NE NE 10 NE NE 700 NE NE 4* NE NE NE 700 NE NE 2 NE NE Sample ID Sample Collection Date Field Parameters Analytical Results MW-12S 06/18/2015 5.7 30.61 21 55 3.66 127 332 10.6 <0.5 14 <5 NA 292 <1 NA <1 <1 NA <1 23 NA 24 <1 NA <1 14 150 NA <50 <1 NA <1 2.36 <10 MW-12S 06/24/2015 6.0 30.75 22 53 2.92 31 236 3.4 <0.5 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA MW-12S 09/10/2015 5.8 31.69 20 47 2.3 34 239 6.31 0 13 <5 <5 98 <1 <1 <1 <1 <1 <1 16 16 19 <1 <1 <1 13 <50 <50 <50 <1 <1 <1 1.77 <10 MW-12S 12/02/2015 5.7 32.15 17 68 2.7 159 364 6.9 NM 12 15 <5 164 <1 <1 <1 <1 <1 <1 12 12 16 <1 <1 <1 12 <50 <50 <50 <1 <1 <1 1.56 <10 MW-12S 01/07/2016 5.8 31.69 10 111 2.86 185 390 9.89 0 11.1 25 NA 220 <1 NA <1 <1 NA <1 10 NA 11 <1 NA <1 11.1 <50 NA <50 <1 NA <1 1.96 <5 2W-12S 04/06/2016 5.8 29.91 14 46 2.91 159 364 7.42 NM 10.2 12 NA 566 <1 NA <l <1 NA <1 9 NA 12 <1 NA <1 10.2 <50 NA <50 <1 NA <1 1.19 <5 BG-2 12/02/2010 6.6 35.57 19 576 NM NM NM 13 NM NA NA NA 1700 NA NA <0.5 NA NA 15 NA NA 81.8 NA NA NA NA NA NA <50 NA NA <0.08 NA NA BG-2 04/20/2011 6.3 33.35 21 623 1.26 7 212 12.1 NM NA NA NA 298 NA NA <0.5 NA NA <5 NA NA 61.3 NA NA NA NA NA NA <50 NA NA <0.08 NA NA BG-2 07/11/2011 6.3 35.45 26 706 0.32 -77 128 9.2 NM NA NA NA 298 NA NA <0.5 NA NA <5 NA NA 64.86 NA NA NA NA NA NA <50 NA NA <0.08 NA NA BG-2 11/03/2011 6.3 35.90 17 671 0.67 -98 107 5.63 NM NA NA NA 180 NA NA <0.5 NA NA <5 NA NA 67.7 NA NA NA NA NA NA <50 NA NA <0.08 NA NA BG-2 04/04/2012 6.3 35.71 21 647 0.34 -93 113 5.55 NM NA NA NA <100 NA NA <0.5 NA NA <5 NA NA 61.5 NA NA NA NA NA NA <50 NA NA <0.08 NA NA BG-2 07/09/2012 6.3 35.94 20 652 0.51 -78 127 9.47 NM NA NA NA 262 NA NA <0.5 NA NA <5 NA NA 53.4 NA NA NA NA NA NA <50 NA NA <0.08 NA NA BG-2 11/05/2012 6.3 36.20 17 640 0.51 90 295 9.02 NM NA NA NA 506 NAINA<0.5 NA NA <5 NA NA 60.2 NA NA NA NA NA NA <50 NA NA <0.08 NA NA BG-2 04/10/2013 6.3 35.33 18 725 0.17 -17 188 8.5 NM NA NA NA 226 NA <1 NA NA <1 NA NA 66 NA NA NA NA NA NA <50 NA NA <1 NA NA BG-2 07/09/2013 6.4 34.66 19 695 0.31 -120 85 8.08 NM NA NA NA 412 NA <1 NA NA <1 NA NA 69 NA NA NA NA NA NA <50 NA NA <1 NA NA BG-2 11/13/2013 6.4 34.40 17 658 0.1 18 223 9.5 NM NA NA NA 384 NA <1 NA NA <1 NA NA 62 NA NA NA NA NA NA <50 NA NA <1 NA NA BG-2 04/01/2014 6.4 33.78 17 709 0.2 68 273 7.5 NM NA NA NA 316 NA <1 NA NA <1 NA NA 71 NA NA NA NA NA NA <50 NA NA <1 NA NA BG-2 07/18/2014 6.4 33.20 18 664 0.14 2 207 7.71 NM NA NA NA 355 NA <1 NA NA <1 NA NA 65 NA NA NA NA NA NA <50 NA NA <1 NA NA BG-2 11/12/2014 6.3 33.02 18 630 0.12 21 226 5.33 NM NA NA NA 233 NA <1 NA NA <1 NA NA 61 NA NA NA NA NA NA <50 NA NA <1 NA NA BG-2 04/13/2015 6.3 31.93 18 652 0.2 -11 194 7.09 NM 259 NA NA 136 NA <1 NA NA <1 NA NA 54 NA NA <1 259 NA NA <50 NA NA <1 57 <5 BG-2 DUP 04/13/2015 6.3 31.93 18 652 0.2 -11 194 7.09 NM 254 NA NA 215 NA <1 NA NA <1 NA NA 55 NA NA <1 254 NA NA <50 NA NA <1 58.1 <5 BG-2 07/07/2015 6.5 31.53 19 623 0.3 -129 76 8.51 NM 225 NA NA 193 NA <1 NA NA <1 NA NA 54 NA NA <1 225 NA NA <50 NA NA <1 56.1 <5 BG-2 09/11/2015 6.4 31.49 18 537 0.03 -40 165 6.88 0 220 <5 <5 82 <1 <1 <<1 <1 50 49 50 <1 <1 <1 220 <50 <50 <50 <1 <1 <1 50.6 <10 BG-2 11/03/2015 6.7 31.89 18 14 7.88 59 264 11.3 246 Ml NA NA 273 NA <1 NA NA <1 NA NA 51 NA NA <1 246 NA NA <50 NA NA <1 53.9 <5 BG-2 12/09/2015 6.4 31.68 16 612 0.71 3 208 5.24 5 257 Ml <100 <100 <100 <0.5 <0.5 <0.5 <0.5 <0.5 50 51 60 <0.2 <0.2 <0.2 257 <50 <50 <50 <0.08 <0.08 <0.08 57.2 Ml <5 BG-2 01/08/2016 6.4 31.23 17 588 0.9 -16 189 1.98 2NM 5 263 <5 NA 80 <1 <1 <1 NA <1 54 NA 58 <1 NA <1 263 <50 NA <50 <1 NA <1 57.3 <5 BG-2 04/04/2016 6.4 30.42 18 651 0.15 139 344 2.71 5 303 <5 NA 65 <1 NA <1 <1 NA <1 55 NA 65 <1 NA <1 303 <50 NA <50 <1 NA <1 59.2 <5 MW-12D 06/24/2015 6.2 31.15 17 136 2.42 -1 204 4.02 0 53 <5 NA 184 1.66 NA 1.63 <1 NA <1 23 NA 26 <1 NA <1 53 <50 NA <50 <1 NA <1 12.6 <10 MW-12D 06/25/2015 6.2 31.10 17 124 2.72 29 234 4.5 0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA MW-12D 09/10/2015 6.2 32.10 17 125 2.6 39 244 3.88 0 57 10 <5 220 <1 <1 <1 <1 <1 <1 18 17 20 <1 <1 <1 57 <50 <50 <50 <1 <1 <1 11.7 <10 MW-121) 12/02/2015 6.0 32.50 16 135 3.4 135 340 11.3 0 54 <5 <5 306 <1 <1 1.44 <1 <1 <1 18 19 21 <1 <1 <1 54 <50 <50 <50 <1 <1 <1 11.3 <10 MW-12D DUP 12/02/2015 6.0 32.50 16 135 3.4 135 340 11.3 0 55 <5 <5 239 <1 <1 <1 <1 <1 <1 18 18 20 <1 <1 <1 55 <50 <50 <50 <1 <1 <1 11.3 <10 MW-12D 12/04/2015 6.2 32.63 18 122 3.35 140 345 8.08 0 53.2 <100 <100 150 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 18 18 20 <0.2 <0.2 <0.2 53.2 <50 <50 <50 0.083 <0.08 0.099 11.5 <5 MW-121) 01/07/2016 6.1 31.95 15 118 3.1 136 341 9.26 NM 53.5 <5 NA 678 <1 NA <1 <1 NA <1 15 NA 22 <1 NA <1 53.5 <50 NA <50 <1 NA <1 11.7 <5 MW-12D 04/05/2016 5.9 30.28 16 125 3.45 120 325 9.9 NM 55.1 <5 NA 370 <1 NA <1 <1 NA <1 17 NA 21 <1 NA <1 55.1 <50 NA <50 <1 NA <1 11.4 <5 BG-1 10/31/2008 5.7 35.99 16 141 NM NM NM NM NM NA NA NA NA NA NA 0.13 NA NA 1.4 NA NA 1040 NA NA NA NA NA NA 6 NA NA 1.1 NA NA BG-1 06/04/2009 6.9 34.44 18 161 NM NM NM NM NM NA NA NA NA NA NA 2.5 NA NA <1 NA NA 155 NA NA NA NA NA NA <200 NA NA <1 NA NA BG-1 10/21/2009 5.3 36.55 16 102 NM NM NM NM NM NA NA NA NA NA NA 4.2 NA NA <1 NA NA 175 NA NA NA NA NA NA <200 NA NA <1 NA NA BG-1 04/22/2010 5.6 33.59 15 107 NM NM NM NM NM NA NA NA NA NA NA <10 NA NA <10 NA NA 120 NA NA NA NA NA NA <50 NA NA <2 NA NA BG-1 12/06/2010 5.9 36.64 16 186 NM NM NM 10 NM NA NA NA 770 NA NA <0.5 NA NA <5 NA NA 105 NA NA NA NA NA NA <50 NA NA 0.12 NA NA BG-1 04/20/2011 5.5 35.36 20 158 1.16 50 255 22.7 NM NA NA NA 456 NA NA <0.5 NA NA <5 NA NA 99.1 NA NA NA NA NA NA <50 NA NA 0.15 NA NA BG-1 07/11/2011 5.5 35.57 24 163 0.99 -71 134 24.2 NM NA NA NA 584 NA NA <0.5 NA NA <5 NA NA 101 B NA NA NA NA NA NA <50 NA NA 0.23 NA NA BG-1 11/03/2011 5.9 37.18 1 18 1 165 1.27 -103 102 3.84 NM NA NA NA 216 NA NA <0.5 NA NA <5 NA NA 95.4 NA NA NA NA NA NA <50 NA NA 0.2 NA NA BG-1 04/04/2012 5.6 36.01 21 168 0.93 -91 1141 9.52 NM NA NA NA 191 NA NA <0.5 NA NA <5 NA NA 93 NA NA NA NA NA NA <50 NA NA 0.12 NA NA BG-1 07/09/2012 5.3 36.69 19 166 1.05 -64 141 9.32 NM NA NA NA 478 NA NA <0.5 NA NA <5 NA NA 101 NA NA NA NA NA NA <50 NA NA 0.13 NA NA BG-1 11/05/2012 5.4 37.45 17 166 0.89 178 383 9.45 NM NA NA NA 465 NA NA <0.5 NA NA <5 NA NA 101 NA NA NA NA NA NA <50 NA NA 0.089 NA NA BG-1 04/10/2013 5.2 35.25 17 165 0.79 213 418 9.05 NM NA NA NA 202 NA NA <1 NA NA <1 NA NA 97 NA NA NA NA NA NA <50 NA NA <1 NA NA BG-1 07/09/2013 5.4 34.17 19 160 1.02 152 357 8.95 NM NA NA NA 383 NA NA <1 NA NA <1 NA NA 97 NA NA NA NA NA NA <50 NA NA <1 NA NA BG-1 11/13/2013 5.5 34.42 15 160 1.3 256 461 8.2 NM NA NA NA 339 NA NA <1 NA NA <1 NA NA 95 NA NA NA NA NA NA <50 NA NA <1 NA NA BG-1 04/01/2014 5.4 32.85 15 159 1.2 340 545 8.2 NM NA NA NA 202 NA NA <1 NA NA <1 NA NA 90 NA NA NA NA NA NA <50 NA NA <1 NA NA BG-1 07/18/2014 5.5 32.12 19 158 1.4 1 232 437 6.68 NM NA NA NA 245 NA NA <1 NA NA <1 NA NA 93 NA NA NA NA NA NA <50 NA NA <1 NA NA BG-1 11/12/2014 5.5 31.90 18 167 1.64 255 4601 9.96 NM NA NA NA 332 NA NA <1 NA NA 95 NA NA NA NA NA NA <50 NA NA <1 NA NA BG-1 04/13/2015 5.5 30.16 17 154 1.2 296 501 8.9 NM 49.8 NA NA 392 NA NA <1 NA NA 90 NA NA <1 49.8 NA NA <50 NA NA <1 12.5 <5 BG-1 07/07/2015 5.6 29.86 18 151 1.6 113 318 10 NM 48.3 NA NA 418 NA NA <1 NA NA 97 NA NA <1 48.3 NA NA <50 NA NA <1 13.1 <5 BG-1 09/10/2015 5.3 30.43 19 168 1.5 190 395 7.83 0 54 <5 NA 276 <1 NA <1 <1 7 NA 91 <1 NA <1 54 <50 NA <50 <1 NA <1 12.8 <10 BG-1 11/03/2015 6.9 30.00 20 14 9.3 7 212 1.79 NM 52.1 NA NA 33 NA NA <1 NA Z<1 NA 90 NA NA <1 52.1 NA NA <50 NA NA <1 12.8 B2 <5 BG-1 12/OS/2015 5.5 30.34 16 150 1.55 128 333 9.5 0 52.8 <100 <100 250 <2.5 <2.5 <0.5 <2.5 7 86 94 <1 <1 <0.2 52.8 <50 <50 <50 <0.4 <0.4 0.13 12.6 <5 BG-1 Ol/08/2016 5.1 29.36 15 147 1.48 67 272 5.78 0 51.1 <5 NA 227 <1 NA <1 <1 3 NA 87 <1 NA <1 51.1 <50 NA <50 <1 NA <1 12.6 <5BG-1 04/04/2016 5.5 28.46 17 149 1.58 206 411 4.3 0 53 <5 NA 177 <1 NA <1 <1 6 NA 88 <1 NA <1 53 <50 NA <50 <1 NA <1 12.1 <5 MW-10BR 03/17/2015 6.2 13.19 22 467 1 0.55 1 99 304 35.5 1 0.5 1 110 1 13 1 NA 1 641 1 <1 I NA I <1 I <1 I NA I <1 1 25 1 NA 1 27 1 <1 NA I <1 1 110 1 <50 1 NA I <50 I <1 I NA I <1 1 36.8 <10 MW-10BR 09/11/2015 6.1 13.36 25 452 1 0.5 1 14 12191 1.06 1 0 1 110 1 <5 1 NA 1 17 1 <1 I NA I <1 I <1 I NA I <1 1 <5 1 NA 1 5 1 <1 I NA I <1 1 110 1 <50 1 NA 1 <50 1 <1 I NA I <1 1 29.1 1 <10 P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-7 Summ of Analy Results from BG wells CSA Round 5 Page 1 of 8 TABLE 1-7 SUMMARY OF ANALYTICAL RESULTS FROM SITE BACKGROUND WELLS THROUGH APRIL 2016 MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter Chloride Chromium (VI) Chromium (VI) Speciation Chromium Chromium Chromium Cobalt Cobalt Cobalt Copper Copper Copper Iron Iron Iron Lead Lead Lead Ma gnesium Manganese Manganese Manganese Mercury Mercury Mercury Methane Molybdenum Molybdenum Molybdenum Nickel Nickel Nickel DIS CIS (0.1u) TOT DIS DIS (0 1u) TOT DIS CIS (0 1u) TOT CIS CIS (0 1u) TOT CIS CIS (0 1u) TOT TOT CIS CIS (0 1u) TOT DIS DIS (0 1u) TOT DIS DIS (0 1u) TOT DIS DIS (0.1u) TOT Reporting Units mg/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I mg/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I u9/I ug/I 15A NCAC 02L Standard 250 NE NE NE NE 10 NE NE 1* NE NE 1000 NE NE 300 NE NE 15 NE NE NE 50 NE NE 1 NE NE NE NE NE NE 100 Sample ID Sample Collection Date Analytical Results MW-125 06/18/2015 3.1 NA NA <1 NA 1.61 1.02 NA 1.09 <1 NA <1 <10 NA 295 <1 NA <1 0.643 249 NA 267 <0.05 NA <0.05 <10 <1 NA <1 1.35 NA 1.45 MW-12S 06/24/2015 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA MW-12S 09/10/2015 3.1 NA NA <1 <1 3.23 1.11 1.15 1.02 <1 <1 <1 84 <10 108 <1 <1 <1 0.723 242 240 253 <0.05 <0.05 <0.05 12 <1 <1 <1 1.82 1.52 2.98 MW-12S 12/02/2015 3.3 0.043 NA 2.01 <1 7.17 <1 <1 <1 <1 <1 <1 87 66 336 <1 <1 <1 0.792 137 142 152 <0.05 <0.05 <0.05 <10 <t <1 <1 2.71 2.48 5.41 MW-12S 01/07/2016 3.1 0.038 NA <1 NA 1.43 <1 NA <1 <1 NA <1 28 NA 178 <1 NA <1 0.753 80 NA 68 <0.05 NA <0.05 <10 NA <1 1.36 NA 1.6 MW-12S 04/06/2016 3.3 0.058 NA <1 NA <1 <1 NA <1. 12.1 NA <1 11 NA 338 1.75 NA <1 0.749 26 NA 24 <0.05 NA <0.05 <10 NA <1 <1 NA <1 L. or NA 198 NA NA <0.2 NA NA NA NA NA NA <5 BG-2 12/02/2010 43.5 NA NA NA NA 6.7 NA NA NA NA NA 14 NA NA 2660 NA NA <5 NA NA BG-2 04/20/2011 35.4 NA NA NA NA <5 NA NA NA NA NA <5 NA NA 439 NA NA <5 NA NA NA 73.4 NA NA <0.2 NA NA NA NA NA NA <5 BG-2 07/11/2011 32.6 B NA NA NA NA 10.2 NA NA NA NA NA <5 NA NA 559 NA NA <5 NA NA NA 64.2 NA NA <0.2 NA NA NA NA NA NA 9.4 B BG-2 11/03/2011 32.9 NA NA NA NA 7.5 NA NA NA NA NA <5 NA NA 312 NA NA <5 NA NA NA 36.7 NA NA <0.2 NA NA NA NA NA NA 5.2 BG-2 04/04/2012 32.6 NA NA NA NA <5 NA NA NA NA NA <5 NA NA 152 NA NA <5 NA NA NA 27 NA NA <0.2 NA NA NA NA NA NA <5 BG-2 07/09/2012 35.3 NA NA NA NA 5.9 NA NA NA NA NA <5 NA NA 460 NA NA <5 NA NA NA 54.9 NA NA <0.2 NA NA NA NA NA NA <5 BG-2 11/05/2012 33.3 NA NA NA NA 6 NA NA NA NA NA <5 NA NA 759 NA NA <5 NA NA NA 43.7 NA NA <0.2 NA NA NA NA NA NA <5 BG-2 04/10/2013 26 NA NA NA NA <5 NA NA NA NA NA <5 NA NA 646 NA NA <1 NA NA NA 111 NA NA 0.18 NA NA NA NA NA NA <5 BG-2 07/09/2013 30 NA NA NA NA <5 NA NA NA NA NA <5 NA NA 1130 NA NA <1 NA NA NA 248 NA NA 0.11 NA NA NA NA NA NA <5 BG-2 11/13/2013 29 NA NA NA NA <5 NA NA NA NA NA <5 NA NA 841 NA NA <1 NA NA NA 177 NA NA 0.11 NA NA NA NA NA NA <5 BG-2 04/01/2014 28 NA NA NA NA <5 NA NA NA NA NA <5 NA NA 943 NA NA <1 NA NA NA 226 NA NA 0.06 NA NA NA NA NA NA <5 BG-2 07/18/2014 30 NA NA NA NA <5 NA NA NA NA NA <5 NA NA 1010 NA NA <1 NA NA NA 244 NA NA 0.08 NA NA NA NA NA NA <5 BG-2 11/12/2014 30 NA NA NA NA <5 NA NA NA NA NA <5 NA NA 647 NA NA <1 NA NA NA 180 NA NA <0.05 NA NA NA NA NA NA <5 BG-2 04/13/2015 28 NA NA NA NA <5 NA NA <1 NA NA <5 NA NA 435 NA NA <1 11.8 NA NA 150 NA NA 0.06 NA NA NA <1 NA NA <5 BG-2 DUP 04/13/2015 28 NA NA NA NA <5 NA NA <1 NA NA <5 NA NA 546 NA NA <1 12.1 NA NA 155 NA NA 0.05 NA NA NA <1 NA NA <5 BG-2 07/07/2015 30 NA <0.021 NA NA <5 NA NA <1 NA NA <5 NA NA 467 NA NA <1 12 NA NA 135 NA NA <0.05 NA NA NA <1 NA NA <5 BG-2 09/11/2015 32 NA NA <1 <1 4.05 <1 <1 <1 6.39 <1 <1 135 132 244 <1 <1 <1 10.6 127 125 130 <0.05 <0.05 <0.05 400 1 <1 <1 <1 1.48 1.37 2.87 BG-2 11/03/2015 33 NA NA NA NA <5 NA NA <1 NA NA <5 NA NA 513 NA NA <1 11.6 NA NA 102 NA NA 0.06 NA NA NA <1 NA NA <5 BG-2 12/09/2015 29.7 <0.03 NA 0.5 <0.5 <0.5 B <0.5 <0.5 <0.5 <1 <1 <1 310 240 450 <0.1 <0.1 <0.1 12.3 200 200 200 <0.2 <0.2 <0.2 660 0.72 0.7 0.74 0.96 0.77 0.82 BG-2 01/08/2016 33 <0.03 NA <1 NA <1 <1 NA <1 <1 NA 1.21 320 NA 471 <1 NA <1 12.6 172 NA 196 <0.05 NA <0.05 477 <1 NA <1 <1 NA <1 BG-2 04/04/2016 1 30 1 <0.03 NA <1 NA <5 <1 NA <1 <1 NA <5 297 NA 585 <1 NA <1 13.9 1 169 NA 237 <0.05 NA <0.05 1 1130 1 <1 NA <1 1.05 NA <5 MW-12D 06/24/2015 4 NA NA <1 NA <1 1.28 NA 1.37 <1 NA <1 95 NA 326 <1 NA <1 3.44 674 NA 683 <0.05 NA <0.05 <10 1.63 NA 1.75 1.82 NA 2.5 MW-12D 06/25/2015 NA NA 0.334 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA MW-12D 09/10/2015 4.1 NA 0.357 <1 <1 1.1 <1 <1 <1 <1 <1 <1 48 29 277 <1 <1 <1 3.04 207 196 218 <0.05 <0.05 <0.05 <10 <1 <1 <1 1.38 1.32 1.35 MW-12D 12/02/2015 4.5 0.55 NA <1 <1 3.43 <1 <1 <1 <1 <1 <1 32 29 504 <1 <1 <1 3.22 185 187 193 <0.05 <0.05 <0.05 <10 <1 <1 <1 1.76 1.8 3.01 MW-12D CUP 12/02/2015 4.5 0.64 NA <1 <1 3.13 <1 <1 <1 <1 <1 <1 32 30 393 <1 <1 <1 3.2 187 188 193 <0.05 <0.05 <0.05 <10 <1 <1 <1 1.54 1.65 2.52 MW-12D 12/04/2015 3.7 0.64 M1 NA 0.76 0.73 4.6 <0.5 <0.5 0.51 <1 <1 <1 <50 <50 280 <0.1 <0.1 <0.1 3.24 160 160 160 <0.2 <0.2 <0.2 <10 0.73 0.68 0.8 2.1 1.9 3.7 MW-12D 01/07/2016 4.5 0.52 M1 NA <1 NA 2.99 <1 NA <1 <1 NA 1.54 <10 NA 968 <1 NA <1 3.28 112 NA 131 <0.05 NA <0.05 <10 <1 NA <1 1.18 NA 2.23 MW-12D 04/05/2016 4.5 0.6 1 NA <1 NA 1.64 <1 NA 11 <1 NA <1 <10 NA 385 <1 NA <1 3.27 95 NA 100 <0.05 NA <0.05 <10 I <1 NA <1 1.24 NA 1.49 BG-1 10/31/2008 17 NA NA NA NA 36.9 NA NA NA NA NA 104 NA NA 65700 NA NA 33.1 NA NA NA 2270 NA NA <0.1 NA NA NA NA NA NA 23.3 BG-1 06/04/2009 18 NA NA NA NA 4.7 NA NA NA NA NA 19.2 NA NA 2100 NA NA 12.9 NA NA NA 131 NA NA <0.2 NA NA NA NA NA NA 4.9 BG-1 10/21/2009 15 NA NA NA NA 15.7 NA NA NA NA NA 497 NA NA 4610 NA NA 2.3 NA NA NA 166 NA NA <0.2 NA NA NA NA NA NA 9.3 BG-1 04/22/2010 14 NA NA NA NA 8.2 NA NA NA NA NA 18 NA NA 2000 NA NA 12 NA NA NA 39 NA NA 0.16 NA NA NA NA NA NA <40 BG-1 12/06/2010 15 NA NA NA NA 15.3 NA NA NA NA NA 31.1 NA NA 1080 NA NA <5 NA NA NA 26.3 NA NA <0.2 NA NA NA NA NA NA 14.9 BG-1 04/20/2011 14.1 NA NA NA NA 6.1 NA NA NA NA NA 11.7 NA NA 702 NA NA <5 NA NA NA 26.6 NA NA <0.2 NA NA NA NA NA NA 7.7 BG-1 07/11/2011 13.8 B NA NA NA NA 40.1 NA NA NA NA NA <5 NA NA 1040 NA NA <5 NA NA NA 29.6 NA NA <0.2 NA NA NA NA NA NA 40.46 BG-1 11/03/2011 13.1 NA NA NA NA 7.9 NA NA NA NA NA <5 NA NA 261 NA NA <5 NA NA NA 8.9 NA NA <0.2 NA NA NA NA NA NA 6.2 BG-1 04/04/2012 14.3 NA NA NA NA 6.7 NA NA NA NA NA <5 NA NA 388 NA NA <5 NA NA NA 11.6 NA NA <0.2 NA NA NA NA NA NA <5 BG-1 07/09/2012 14.6 NA NA NA NA 20 NA NA NA NA NA <5 NA NA 640 NA NA <5 NA NA NA 21.6 NA NA <0.2 NA NA NA NA NA NA 9.4 BG-1 11/05/2012 13.4 NA NA NA NA <5 NA NA NA NA NA <5 NA NA 526 NA NA <5 NA NA NA 55.6 NA NA <0.2 NA NA NA NA NA NA <5 BG-1 04/10/2013 13 NA NA NA NA 7 NA NA NA NA NA <5 NA NA 323 NA NA <1 NA NA NA 15 NA NA <0.05 NA NA NA NA NA NA <5 BG-1 07/09/2013 13 NA NA NA NA <5 NA NA NA NA NA <5 NA NA 488 NA NA <1 NA NA NA 48 NA NA <0.05 NA NA NA NA NA NA <5 BG-1 11/13/2013 12 NA NA NA NA <5 NA NA NA NA NA <5 NA NA 412 NA NA <1 NA NA NA 27 1 NA NA <0.05 NA NA NA NA NA NA <5 BG-1 04/01/2014 12 NA NA NA NA <5 NA NA NA NA NA <5 NA NA 290 NA NA <1 NA NA NA 14 NA NA <0.05 NA NA NA NA NA NA <5 BG-1 07/18/2014 12 NA NA NA NA <5 NA NA NA NA NA <5 NA NA 325 NA NA <1 NA NA NA 15 NA NA <0.05 NA NA NA NA NA NA <5 BG-1 11/12/2014 12 NA NA NA NA <5 NA NA NA NA NA <5 NA NA 466 NA NA <1 NA NA NA 25 NA NA <0.05 NA NA NA NA NA NA <5 BG-1 04/13/2015 11 NA NA NA NA <5 NA NA <1 NA NA <5 NA NA 409 NA NA <1 3.35 NA NA 35 NA NA <0.05 NA NA NA <1 NA NA <5 BG-1 07/07/2015 11 NA NA NA NA <5 NA NA <1 NA NA <5 NA NA 557 NA NA <1 3.63 NA NA 23 NA NA <0.05 NA NA NA <1 NA NA <5 BG-1 09/10/2015 11 NA NA <1 NA <1 <1 NA <1 <1 NA <1 <10 NA 300 <1 NA <1 3.41 15 NA 26 <0.05 NA <0.05 16 <1 NA <1 1.46 NA 1.78 BG-1 11/03/2015 12 NA NA NA NA <5 NA NA <1 NA NA <5 NA NA 45 NA NA <1 3.28 NA NA 7 NA NA <0.05 NA NA NA <1 NA NA <5 BG-1 12/25/2015 10.1 0.31 NA <2.5 <2.5 1 <2.5 <2.5 <0.5 <5 <5 11 <50 <50 350 <0.5 <0.5 0.13 3.26 7.6 7.5 1S <0.2 <0.2 <0.2 <10 <2.5 <2.5 <0.5 <2.5 <2.5 1.9 BG-1 O1108/2016 12 0.2 NA <1 NA <1 <1 NA <1 <1 NA <1 <10 NA 272 <1 NA <1 3.36 6 NA 11 <0.05 NA <0.05 <10 <1 NA <1 1.28 NA 1.24 BG-1 04/04/2016 11 0.19 Ml NA <1 NA <5 <1 NA <1 <1 NA <5 <10 NA 190 <1 NA <1 3.2 13 NA 12 <0.05 NA <0.05 <10 <1 NA <1 1.39 NA <5 MW-10BR 03/17/2015 23 NA NA <1 NA 1.3 <1 NA <1 <1 NA <1 286 NA 883 <1 NA <1 15.5 954 NA 894 <0.5 NA <0.05 <10 2.54 NA 2.37 1.91 NA 3.09 MW-10BR 09/11/2015 19 NA NA <1 NA <1 <1 NA <1 9.78 NA <1 22 NA 37 <1 NA <1 13.7 135 NA 135 <0.05 NA <0.05 <10 <1 NA 1 2.13 NA 1.83 P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-7 Summ of Analy Results from BG wells CSA Round 5 Page 2 of 8 TABLE 1-7 SUMMARY OF ANALYTICAL RESULTS FROM SITE BACKGROUND WELLS THROUGH APRIL 2016 MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter Nitrate (as N) Nitrate Potassium Selenium Selenium Selenium Sodium Strontium Strontium Strontium Sulfate Sulfide Thallium Thallium Thallium Total Dissolved Solids Total Organic Carbon Total Suspended Solids Vanadium Vanadium Vanadium Zinc Zinc Zinc Radium-226 Radium-228 TOT DIS DIS (0.1u) TOT TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT Reporting Units mg-N/L mg/I mg/I ug/I ug/I ug/I mg/I ug/I ug/I ug/I mg/I mg/I ug/I ug/I ug/I mg/I mg/I mg/I ug/I ug/I ug/I ug/I ug/I ug/l PCi/I PCi/I 15A NCAC 02L Standard 10 10 NE 20 NE NE NE NE NE NE 250 NE NE NE 0.2* 500 NE NE NE NE 0.3* NE NE 1000 NE NE Sample ID Sample Collection Date Analytical Results MW-12S 06/18/2015 1 NA 1.86 <1 NA <1 6.79 30 NA 27 1.9 <0.1 <0.2 NA <0.2 50 0.68 <5 <0.3 NA 0.403 56 NA 67 NA NA MW-12S 06/24/2015 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.84 13 MW-12S 09/10/2015 0.7 NA 1.53 <1 <1 <1 5.43 22 22 23 1.4 <0.1 <0.2 <0.2 <0.2 55 0.633 <5 <0.3 <0.3 <0.3 59 73 64 NA NA MW-12S 12/02/2015 0.638 NA 1.4 <1 <1 <1 5.08 19 20 21 1.3 <0.1 <0.2 <0.2 <0.2 26 0.519 6 <0.3 <0.3 0.313 78 84 79 NA NA MW-12S 01/07/2016 0.599 NA 1.58 <1 NA <1 4.76 18 NA 18 1.4 <0.1 <0.2 NA <0.2 35 1.6 <5 <0.3 NA <0.3 144 NA 157 NA NA MW-12S 04/06/2016 0.798 NA 1.22 <1 NA <1 5.49 16 fJ1\ 17 1.2 <0.1 <0.2 NA 10.2 29 0.522 <5 <0.3 NA 0.408 52 NA 43 0.537 <3 BG-Z 12/02/2010 NA <0.1 NA NA NA <10 NA NA NA NA 8.5 NA NA NA <0.1 349 NA NA NA NA NA NA NA 30.9 NA NA BG-2 04/20/2011 NA <0.1 NA NA NA <10 NA NA NA NA 8.3 NA NA NA <0.1 382 NA NA NA NA NA NA NA 18.7 NA NA BG-2 07/11/2011 NA <0.2 NA NA NA <10 NA NA NA NA 7.2 B NA NA NA <0.1 367 B NA NA NA NA NA NA NA <10 NA NA BG-2 11/03/2011 NA <0.2 NA NA NA <10 NA NA NA NA 6.9 NA NA NA <0.1 341 NA NA NA NA NA NA NA <10 NA NA BG-2 04/04/2012 NA <0.2 NA NA NA <10 NA NA NA NA 7.5 NA NA NA <0.1 412 NA NA NA NA NA NA NA <10 NA NA BG-2 07/09/2012 NA <0.02 NA NA NA <10 NA NA NA NA 7.7 NA NA NA <0A 382 NA NA NA NA NA NA NA <10 NA NA BG-2 11/05/2012 NA <0.02 NA NA NA <10 NA NA NA NA 8.3 NA NA NA <0.1 389 NA NA NA NA NA NA NA <10 NA NA BG-2 04/10/2013 NA 0.03 NA NA NA <1 NA NA NA NA 5.4 NA NA NA <0.2 430 NA NA NA NA NA NA NA <5 NA NA BG-2 07/09/2013 NA <0.023 NA NA NA <1 NA NA NA NA 5.2 NA NA NA <0.2 430 NA NA NA NA NA NA NA <5 NA NA BG-2 11/13/2013 NA <0.023 NA NA NA <1 NA NA NA NA 5.2 NA NA NA <0.2 360 NA NA NA NA NA NA NA <5 NA NA BG-2 04/01/2014 NA <0.023 NA NA NA <1 NA NA NA NA 4.8 NA NA NA <0.2 450 NA NA NA NA NA NA NA 8 NA NA BG-2 07/18/2014 NA <0.023 NA NA NA <1 NA NA NA NA 4.9 NA NA NA <0.2 400 NA NA NA NA NA NA NA 5 NA NA BG-2 11/12/2014 NA <0.023 NA NA NA <1 NA NA NA NA 5 NA NA NA <0.2 370 NA NA NA NA NA NA NA 8 NA NA BG-2 04/13/2015 NA <0.023 3.27 NA NA <1 49.7 NA NA NA 4.8 NA NA NA <0.2 380 NA 8 NA NA NA NA NA 11 NA NA BG-2 DUP 04/13/2015 NA <0.023 3.3 NA NA <1 50.3 NA NA NA 4.7 NA NA NA <0.2 360 NA 7 NA NA NA NA NA 10 NA NA BG-2 07/07/2015 <0.023 <0A 3.61 NA NA <1 48.2 NA NA NA 5.1 NA NA NA <0.2 370 NA 8 NA NA 5.88 NA NA 15 NA NA BG-2 09/11/2015 0.019 NA 3.56 <1 <1 <1 44.6 283 1 279 291 5.4 <0.1 <0.2 <0.2 <0.2 330 1.4 5 3.61 3.22 4 33 22 23 NA NA BG-2 11/03/2015 <0.023 <0.1 3.67 NA NA <1 46.7 NA NA 318 5.5 NA NA NA <0.2 350 NA 14 NA NA 6.63 NA NA <5 NA NA BG-2 12/09/2015 <0.02 NA <5 <0.5 <0.5 <0.5 51.3 370 360 390 5.1 <0.1 <0.1 <0A <0.1 314 1.1 <2.8 4.9 4.8 5.8 <10 <10 12 NA NA BG-2 01/08/2016 <0.01 NA 3.4 <1 NA <1 50.6 325 NA 350 5.5 <0.1 <0.2 NA <0.2 370 1.3 <5 3.49 NA 4.2 <5 NA <5 NA NA BG-2 04/04/2016 <0.023 <0.1 3.34 <1 NA <1 56 335 NA 391 4.9 <0.1 <0.2 NA <0.2 360 1.8 24 4.14 NA 5 <5 NA <5 4.07 <3 MW-121) 06/24/2015 0.08 NA 1.6 <1 NA <1 8.98 94 NA 95 0.96 <0A <0.2 NA <0.2 120 0.396 <5 0.642 NA 0.719 6 NA <5 NA NA MW-121) 06/25/2015 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA MW-12D 09/10/2015 0.664 NA 1.41 <1 <1 <1 9.03 86 84 85 0.99 <0A <0.2 <0.2 <0.2 100 1.7 7 0.436 0.47 0.637 5 6 9 NA NA MW-12D 12/02/2015 0.132 NA 1.46 <1 <1 <1 9.18 87 88 90 1 <0.1 <0.2 <0.2 <0.2 97 0.266 7 0.366 0.398 1.01 15 14 16 NA NA MW-12D DUP 12/02/2015 0.143 NA 1.44 <1 <1 <1 9.24 88 88 91 1.1 <0A <0.2 <0.2 <0.2 69 0.251 8 0.414 0.401 0.768 14 17 17 NA NA MW-12D 12/04/2015 0.15 NA <5 <0.5 <0.5 <0.5 9.56 83 83 85 <1 <0.1 <0.1 <0.1 <0A 122 <1 <5.8 <1 <1 <1 <10 <10 <10 NA NA MW-122 21/07/2016 0.139 NA 1.39 <1 NA <1 8.76 90 NA 87 1.1 <0A <0.2 NA <0.2 82 0.184 47 0.386 NA 1.65 <5 NA 5 NA NA MW-12D 04/0S/2016 0.146 NA 1.42 <1 NA <1 9.35 90 NA 92 1.1 <0.1 <0.2 NA <0.2 120 0.314 29 0.428 NA 1.06 <5 NA <5 6 <3 BG-1 10/31/2008 NA <0.25 NA NA NA 2.4 NA NA NA NA <25 NA NA NA 0.35 189 NA NA NA NA NA NA NA 229 NA NA BG-1 06/04/2009 NA <0.05 NA NA NA <5 NA NA NA NA <25 NA NA NA <1 167 NA NA NA NA NA NA NA 69.3 NA NA BG-1 10/21/2009 NA 0.58 NA NA NA <5 NA NA NA NA <5 NA NA NA <1 146 NA NA NA NA NA NA NA 133 NA NA BG-1 04/22/2010 NA 0.24 NA NA NA <10 NA NA NA NA <1 NA NA NA <50 17 NA NA NA NA NA NA NA <20 NA NA BG-1 12/06/2010 NA 0.36 NA NA NA <10 NA NA NA NA <5 NA NA NA <0.1 126 NA NA NA NA NA NA NA 71 NA NA BG-1 04/20/2011 NA 0.35 NA NA NA <10 NA NA NA NA <5 NA NA NA <0.1 135 NA NA NA NA NA NA NA 45.6 NA NA BG-1 07/11/2011 NA 0.44 NA NA NA <10 NA NA NA NA <5 NA NA NA <0.1 117 B NA NA NA NA NA NA NA 14.6 NA NA BG-1 11/03/2011 NA 0.41 NA NA NA <10 NA NA NA NA <5 NA NA NA <0.1 106 NA NA NA NA NA NA NA <10 NA NA BG-1 04/04/2012 NA 0.36 NA NA NA <10 NA NA NA NA <5 NA NA NA <0.1 107 NA NA NA NA NA NA NA <10 NA NA BG-1 07/09/2012 NA 0.39 NA NA NA <10 NA NA NA NA 2 NA NA NA <0.1 128 NA NA NA NA NA NA NA <10 NA NA BG-1 11/05/2012 NA 0.42 NA NA NA <10 NA NA NA NA <2 NA NA NA <0.1 123 NA NA NA NA NA NA NA 11.6 NA NA BG-1 04/10/2013 NA 0.4 NA NA NA <1 NA NA NA NA 0.44 NA NA NA <0.2 130 NA NA NA NA NA NA NA 7 NA NA BG-1 07/09/2013 NA 0.46 NA NA NA <1 NA NA NA NA 0.52 NA NA NA <0.2 130 NA NA NA NA NA NA NA 12 NA NA BG-1 11/13/2013 NA 0.48 NA NA NA <1 NA NA NA NA 0.51 NA NA NA <0.2 130 NA NA NA NA NA NA NA 30 NA NA BG-1 04/01/2014 NA 0.5 NA NA NA <1 NA NA NA NA 0.4 NA NA NA <0.2 140 NA NA NA NA NA NA NA 29 NA NA BG-1 07/18/2014 NA 0.52 NA NA NA <1 NA NA NA NA 0.46 NA NA NA <0.2 140 NA NA NA NA NA NA NA 16 NA NA BG-1 11/12/2014 NA 0.59 NA NA NA <1 NA NA NA NA 0.51 NA NA NA <0.2 120 NA NA NA NA NA NA NA 34 NA NA BG-1 04/13/2015 NA 0.57 1.4 NA NA <1 12.4 NA NA NA 0.32 NA NA NA <0.2 130 NA 5 NA NA NA NA NA 29 NA NA BG-1 07/07/2015 0.64 2.8 1.5 NA NA <1 11.8 NA NA NA 0.32 NA NA NA <0.2 130 NA 5 NA NA 4.94 NA NA 50 NA NA BG-1 09/10/2015 0.645 NA 1.38 <1 NA <1 11.6 165 NA 172 0.37 <0.1 <0.2 NA <0.2 120 0.913 8 3.16 NA 3.93 22 NA 17 NA NA BG-1 11/03/2015 0.71 3.1 1.35 NA NA <1 11.8 B2 NA NA 179 0.36 NA NA NA <0.2 110 NA <5 NA NA 3.4 NA NA <5 NA NA BG-1 12/05/2015 0.66 NA <5 <2.5 <2.5 <0.5 12.2 170 170 180 <1 <0.1 <0.5 <0.5 <0.1 118 1 <3.2 <5 <5 4.2 15 14 14 NA NA BG-1 Ol/OS/2016 0.643 NA 1.39 <1 NA <1 11.9 161 NA 166 0.24 <0.1 <0.2 NA <0.2 130 0.558 <5 3.08 NA 3.94 5 NA <5 NA NA BG-1 04/04/2016 0.75 3.3 1.36 <1 NA <1 11.5 166 NA 167 0.25 <0.1 <0.2 NA <0.2 130 0.738 7 3.38 NA 3.94 8 NA 7 2.25 <3 MW-10BR 03/17/2015 <0.01 NA 8.66 <1 NA <1 37.9 210 NA 210 83 <10 <0.2 NA <0.2 330 2 17 0.861 NA 1.66 6 NA 9 NA NA MW-10BR 09/11/2015 <0.01 NA 4.28 <1 NA <1 39.7 193 NA 198 81 <0.2 <0.2 NA <0.2 310 2.1 <5 1.68 NA 1.73 16 NA <5 NA NA P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-7 Summ of Analy Results from BG wells CSA Round 5 Page 3 of 8 TABLE 1-7 SUMMARY OF ANALYTICAL RESULTS FROM SITE BACKGROUND WELLS THROUGH APRIL 2016 MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter Uranium-233 Uranium-234 Uranium-236 Uranium-238 As(III) As(V) MMAs DMAs Fe(II) Fe(III) Mn(II) Mn(IV) Reporting Units ug/mL ug/mL ug/mL ug/mL ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I 15A NCAC 02L Standard NE NE NE NE NE NE NE NE NE NE NE NE Sample ID MW-12S Sample Collection Date 06/18/2015 Analytical Results NA NA NA NA NA NA NA NA NA NA NA NA MW-12S 06/24/2015 <0.00005 <0.00005 <0.00005 <0.0002 NA NA NA NA NA NA NA NA MW-12S 09/10/2015 NA NA NA NA NA NA NA NA NA NA NA NA MW-12S 12/02/2015 NA NA NA NA NA NA NA NA NA NA NA NA MW-12S O1/07/2016 NA NA NA NA NA NA NA NA NA NA NA NA MW-12S 04/06/2016 <0.00005 <0.00005 <0.00005 0.000217 NA NA NA NA NA NA NA NA BG-2 12/02/2010 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 04/20/2011 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 07/11/2011 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 11/03/2011 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 04/04/2012 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 07/09/2012 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 11/05/2012 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 04/10/2013 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 07/09/2013 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 11/13/2013 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 04/01/2014 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 07/18/2014 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 11/12/2014 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 04/13/2015 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 DUP 04/13/2015 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 07/07/2015 NA NA NA NA NA NA NA NA 331 <5 141 8.53 BG-2 09/11/2015 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 11/03/2015 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 12/09/2015 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 01/08/2016 NA NA NA NA NA NA NA NA NA NA NA NA BG-2 04/04/2016 <0.00005 <0.00005 <0.00005 0.00102 NA NA NA NA NA NA NA NA MW-12D 06/24/2015 NA NA NA NA NA NA NA NA NA NA NA NA MW-12D 06/25/2015 NA NA NA NA NA NA NA NA 82.1 <5 830 <0.18 MW-12D 09/10/2015 NA NA NA NA <0.551 <0.406 <0.31 <0.498 NA NA NA NA MW-12D 12/02/2015 NA NA NA NA NA NA NA NA NA NA NA NA MW-12D DUP 12/02/2015 NA NA NA NA NA NA NA NA NA NA NA NA MW-12D 12/04/2015 NA NA NA NA NA NA NA NA NA NA NA NA MW-12D O1/07/2016 NA NA NA NA NA NA NA NA NA NA NA NA MW-12D 04/05/2016 <0.00005 <0.00005 <0.00005 0.000233 NA NA NA NA NA NA NA NA BG-1 10/31/2008 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 06/04/2009 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 10/21/2009 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 04/22/2010 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 12/06/2010 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 04/20/2011 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 07/11/2011 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 11/03/2011 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 04/04/2012 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 07/09/2012 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 11/05/2012 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 04/10/2013 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 07/09/2013 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 11/13/2013 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 04/01/2014 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 07/18/2014 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 11/12/2014 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 04/13/2015 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 07/07/2015 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 09/10/2015 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 11/03/2015 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 12/05/2015 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 01/08/2016 NA NA NA NA NA NA NA NA NA NA NA NA BG-1 04/04/2016 <0.00005 <0.00005 <0.00005 <0.0002 NA NA NA NA NA NA NA NA MW-10BR 03/17/2015 NA NA NA NA NA NA NA NA NA NA NA NA MW-10BR 09/11/2015 NA NA NA NA NA NA NA NA NA NA NA NA P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-7 Summ of Analy Results from BG wells CSA Round 5 Page 4 of 8 TABLE 1-7 SUMMARY OF ANALYTICAL RESULTS FROM SITE BACKGROUND WELLS THROUGH APRIL 2016 MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter pH Water Level Temp Spec Cond DO ORP Eh Turbidity Ferrous Iron Alkalinity Aluminum Aluminum Aluminum Antimony Antimony Antimony Arsenic Arsenic Arsenic Barium Barium Barium Beryllium Beryllium Beryllium Bi- carbonate Alkalinity Boron Boron Boron Cadmium Cadmium Cadmium Calcium Carbonate Alkalinity DIS DIS (0.1u) TOT DIS DIS (O.Iu) TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT TOT Reporting Units S.U. ft Deg C umh s mg/I mV mV NTUs mg/I mg/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/1 ug/I ug/1 ug/I mg/I ug/1 ug/I ug/1 ug/1 ug/I ug/I mg/I mg/1 SSA NCAC 02L Standard 6.5-8.5 HE HE NE HE HE HE HE HE HE HE HE HE HE HE 1• HE HE SO HE HE 700 HE HE 4• HE HE HE 700 HE HE 2 HE HE Sample ID Sample Collection Date Field Parameters Analytical Results MW-10BR 12/03/2015 6.1 13.30 16 424 1 0.4 1 19 12241 1.5 0.5 1 103 1 6 1 NA 1 34 1 <1 I NA I <1 I <1 I NA I <1 1 5 1 NA I <5 I <1 I NA I <1 1 103 1 <50 1 NA 1 <50 1 <1 I NA I <1 1 Ol/07/2016 6.1 13.08 13 449 0.53 50 255 1.64 0 103 6 NA 62 <1 NA <1 <1 NA <1 <5 NA <5 <1 NA <1 103 <50 NA <50 <1 NA <1 �30J�jMW-lOBR 2MW-10BR 04/05/2016 6.2 12.70 13 443 0.43 141 346 0.98 NM 103 <5 NA 15 <1 NA <1 <1 NA <1 <5 NA <5 <1 NA <1 103 <50 NA <50 <1 NA <1 2 MW-11BR 06/25/2015 8.1 40.25 19 382 2.79 28 233 3.91 0 160 16 NA 80 1.61 NA 1.32 <1 NA <1 46 NA 44 <1 NA <1 160 <50 NA <50 <1 NA <1 49.6 <10 MW-11BR 09/11/2015 9.2 36.86 21 282 1.1 33 238 7.87 0 100 56 NA 195 1.73 NA 1.74 1.09 NA 1.06 31 NA 32 <1 NA <1 88 <50 NA <50 <1 NA <1 30.6 15 MW-11BR 12/03/2015 9.2 36.70 14 230 1.8 -10 195 8.7 0 70.7 94 89 207 1.68 1.82 1.57 1.03 1.03 1.05 19 20 22 <1 <1 <1 69.6 <50 <50 <50 <1 <1 <1 23.3 <5 MW-11BR 01/07/2016 9.8 36.18 14 214 1.2 -40 165 5.04 0 64.8 78 NA 170 1.58 NA 1.9 <1 NA 1.02 22 NA 24 <1 NA <1 36.4 <50 NA <50 <1 NA <1 18.7 28.3 MW-11BR 04/05/2016 10.3 35.21 15 208 1.A 154 359 6.43 NM 58.1 183 NA 319 1.51 NA 1.6 <1 NA <1 21 NA 25 <1 NA <1 12 <50 NA <50 <1 NA <1 15.5 46.1 MW-13BR 6/23/2015 7.2 31.28 21 580 0.4 -228 -23 2.22 1 210 27 NA 37 <1 NA <1 <1 NA <1 41 NA 40 <1 NA <1 210 <50 NA <50 <1 NA <1 75.2 <10 MW-13BR 09/08/2015 6.9 31.63 23 579 0.5 -136 69 7.55 2 230 6 NA 143 Bl <1 NA <1 <1 NA <1 48 NA 51 <1 NA <1 230 <50 NA <50 <1 NA <1 73 <10 MW-13BR 12/02/2015 7.0 31.55 16 543 0.3 -130 75 6.5 2.5 210 <5 NA 171 <1 NA <1 <1 NA <1 41 NA 45 <1 NA <1 210 <50 NA <50 <1 NA <1 72.7 <10 MW-13BR 01/07/2016 7.3 30.36 11 544 0.5 -75 130 7.79 1.5 223 Ml 7 NA 230 <1 NA <1 <1 NA <1 44 NA 42 <1 NA <1 223 <50 NA <50 <1 NA <1 73.3 <5 MW-13BR 04/05/2016 7.1 29.70 15 566 0.3 151 356 9.05 NM 217 <5 NA 97 <1 NA <1 <1 NA <1 31 NA 35 <1 NA <1 217 <50 NA <50 <1 NA <1 70.8 <5 MW-14BR 03/12/2015 6.7 16.20 14 278 1 0.47 1 41 12241 35 1 0.5 1 96 j 9 1 NA 1 589 1 <1 I NA I <1 I <1 I NA I <1 1 28 1 NA 1 30 1 <1 I NA I <1 1 96 1 <50 1 NA 1 <50 1 <1 I NA I <1 1 19.5 1 <10 MW-14BR 09/09/2015 6.9 18.03 22 1 413 1 1.1 1 -16 189 3.36 1 1.5 1 160 1 7 1 NA 1 61 1 <1 I NA I <1 I <1 I NA 1 1.8 1 35 1 NA 1 42 1 <1 I NA I <1 1 160 1 <50 1 NA 1 65 1 <1 I NA I <1 1 20.2 <10 MW-14BR 12/02/2015 6.7 16.54 15 282 0.57 26 231 2.77 0 100 NA <5 77 NA <1 <1 NA <1 <1 NA 21 22 NA <1 <1 100 NA <50 <50 NA <1 <1 13.4 <10 MW-146R Ol/07/2016 6.7 16.31 11 258 2.73 64 269 2.45 0 94.8 <5 NA 163 <1 NA <1 <1 NA <1 17 NA 17 <1 NA <1 94.8 <50 NA '0 <1 NA <1 13 <5 MW-14BR 04/05/2016 6.7 16.27 14 261 2.13 220 425 2.45 NM 104 <5 NA 225 <1 NA <1 <1 NA <1 17 NA 19 <1 NA <1 104 <50 NA <50 <1 NA <1 13 <5 Prepared by: BER Checked by: JAW Notes, = - Bald highlighted concentration indicates exceedance of the 15A NCAC 02L Standard, Appendix 2, April 1, 2013 Spec Cord = Specific Conductance Deg C = Degrees Celsius NTU = Nephelometric turbidity unit DO = Dissolved oxygen CUP = Duplicate umhos/cm = Micro mhos per centimeter NE = Not established ORP = Oxidation -Reduction Potential S.U. = Standard Unit mg/I = Milligram per liter DIS = Dissolved Eh = Oxidation Potential ft = Feet my = Millivolts Temp = Temperature NM = Not measured NA = Not analyzed ug/I = Microgram per liter TOT= Total pCi/I = picocuries per liter mg - N/L = Milligram nitrogen per liter < = Concentration not detected at or above the reporting limit = Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013. ' Data invalid. Sample inadvertently collected before well development. B = Target analyte detected in method blank at or above the reporting limit. Bl = Target analyte detected in method blank at or above the reporting limit. B2 = Target analyte was detected In blank(s) at a concentration greater than 1/2 the reporting limit but less than the reporting limit. Analyte concentration in sample is valid and may be used for complicance purposes. CL = The continuing calibration for this compound is outside of Pace Analytical acceptance limits. Ml = Matrix spike recovery was high: the associated Laboratory Control Spike (LCS) was acceptable. M2 = Matrix spike recovery was Low: the associated Laboratory Control Spike (LCS) was acceptable. P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-7 Summ of Analy Results from BG wells CSA Round 5 Page 5 of 8 TABLE 1-7 SUMMARY OF ANALYTICAL RESULTS FROM SITE BACKGROUND WELLS THROUGH APRIL 2016 MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter Chloride Chromium (VI) Chromium (VI) Speciation Chromium Chromium Chromium Cobalt Cobalt Cobalt Copper Copper Copper Iron Iron Iron Lead Lead Lead Magnesium Manganese Manganese Manganese Mercury Mercury Mercury Methane Molybdenum Molybdenum Molybdenum Nickel Nickel Nickel DIS DIS (0.1u) TOT DIS DIS (O.Iu) TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT Reporting Units mg/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I mg/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I 15A NCAC 02L Standard 250 NE NE NE NE 10 NE NE 1• NE NE 1000 NE NE 300 NE NE 15 NE NE NE 50 NE NE 1 NE NE NE NE NE NE 100 Sample ID Sample Collection Date Analytical Results MW-10BR 12/03/2015 20 <0.03 NA <1 NA <1 <1 NA <1 <1 NA <1 88 NA 193 <1 NA <1 12.9 99 NA 84 <0.05 NA <0.05 <10CL <1 NA <1 1.93 NA MW-10BR 01/07/2016 21 <0.03 NA <1 NA <1 <1 NA <1 <1 NA <1 <10 NA 33 <1 NA <1 13.1 90 NA 103 <0.05 NA <0.05 <10 <1 NA <1 1.88 NA �76 MW-10BR 04/05/2016 21 <0.03 NA <1 NA <1 <1 NA <1 <1 NA <1 25 NA 29 <1 NA <1 12.9 69 NA 71 <0.05 NA <0.05 <10 <1 NA <1 1.82 NA MW-11BR 06/25/2015 16 NA NA 1.59 NA 1.73 <1 NA <1 7.72 NA <1 <10 NA 115 <1 NA <1 11.1 73 NA 67 <0.05 NA <0.05 <10 5.04 NA 5.41 <1 NA <1 MW-11BR 09/11/2015 15 NA NA 14.5 NA 15.6 <1 NA <1 1.65 NA 1.44 <10 NA 153 <1 NA <1 4.96 <5 NA 11 <0.05 NA <0.05 <10 7.4 NA 7.76 <1 NA <1 MW-11BR 12/03/2015 15 13.6 NA 13.8 13.3 24.1 <1 <1 <1 1.08 1.05 1.99 <10 <10 304 <1 <1 <1 8.95 <5 <5 29 <0.05 <0.05 <0.05 <10 CL 7.39 7.62 7.69 <1 <1 7.2 MW-11BR 01/07/2016 16 12.2 NA 14.7 NA 15.1 <1 NA <1 8.14 NA 3.96 <10 NA 98 <1 NA <1 3.51 <5 NA 17 <0.05 NA <0.05 <10 7.65 NA 7.72 <1 NA <1 MW-11BR 04/05/2016 15 18.4 NA 16.5 NA 17.2 <1 NA <1 1.57 NA 3.33 <10 NA 178 <1 NA <1 2.35 <5 NA 25 <0.05 NA <0.05 <10 8.7 NA 8.63 <1 NA <1 MW-13BR 06/23/2015 46 NA 0.005 <1 NA <1 <1 NA 1.19 <1 NA <1 1160 NA 1130 <1 NA <1 13.1 486 NA 474 <0.05 NA <0.05 <10 7.2 NA 8.28 <1 NA <1 MW-13BR 09/08/2015 43 NA NA <1 NA <1 <1 NA <1 <1 NA <1 NA 2400 <1 NA <1 12.9 614 NA 630 <0.05 NA <0.05 <10 4.24 NA 5.17 <1 NA <1 MW-13BR 12/02/2015 41 <0.03 NA <1 NA 16.3 <1 NA <1 <1 NA 1.2 NA 2490 <1 NA <1 13.5 520 NA 548 <0.05 NA <0.05 <10 4.38 NA 5.86 <1 NA 7.97 MW-13BR 01/07/2016 45 <0.03 NA <1 NA 7.65 <1 NA <1 <1 NA <1 �2470 NA 2550 <1 NA <1 12.9 539 NA 519 <0.05 NA <0.05 25.9 5.55 NA 5.81 1.3 NA 4.98 MW-13BR 04/05/2016 43 <0.03 NA <1 NA <1 <1 NA 1.01 <1 NA <1 NA 1750 <1 NA <1 12.9 444 NA 481 <0.05 NA <0.05 27 4.24 NA 4.3 <1 NA <1 MW-14BR 03/12/2015 9.3 NA NA I <1 NA <1 1,41 NA 1.41 <1 NA 4.5 485 NA 907 <1 NA <1 2.96 543 NA 544 <0.05 NA <0.05 <10 14.6 NA 14 11 NA <1 MW-14BR 09/09/2015 11 NA NA <1 NA <1 <1 NA 1.09 <1 NA <1 1680 NA 2730 <1 NA <1 3.07 547 NA 648 <0.05 NA <0.05 13 17 NA 27.3 <1 NA <1 MW-146R 12/02/2015 11 <0.03 NA NA <1 <1 NA <1 <1 NA <1 <1 NA 271 396 NA <1 <1 2.29 NA 312 304 NA <0.05 <0.05 <10 NA 6.34 6.62 NA 1.03 <1 MW-14BR 01/07/2016 13 <0.03 NA <1 NA <1 <1 NA <1 <1 NA 1.21 11 NA 98 <1 NA <1 2.36 212 NA 199 <0.05 NA <0.05 <10 3.97 NA 4.56 <1 IN <1 MW-14BR 04/05/2016 13 <0.03 NA <1 NA <1 <1 NA <1 <1 NA 1.87 <10 NA 89 <1 NA <1 2.36 191 NA 196 <0.05 NA <0.05 <10 4.78 NA 5.06 <1 NA <1 Prepared by: BER Checked by: JAW Notes, = - Bald highlighted concentration indicates exceedance of the 15A NCAC 02L Standard, Appendix 2, April 1, 2013 Spec Cord = Specific Conductance Deg C = Degrees Celsius NTU = Nephelometric turbidity unit DO = Dissolved oxygen CUP = Duplicate umhos/cm = Micro mhos per centimeter NE = Not established ORP = Oxidation -Reduction Potential S.U. = Standard Unit mg/1 = Milligram per liter DIS = Dissolved Eh = Oxidation Potential ft = Feet my = Millivolts TOT= Total NM = Not measured NA = Not analyzed ug/I = Microgram per liter INC = Not calculated pCi/I = pi -curies per liter mg - N/L = Milligram nitrogen per liter < = Concentration not detected at or above the reporting limit = Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013. ' Data invalid. Sample inadvertently collected before well development. B = Target analyte detected in method blank at or above the reporting limit. B1 = Target analyte detected in method blank at or above the reporting limit. B2 = Target analyte was detected In blank(s) at a concentration greater than 1/2 the reporting limit but less than the reporting limit. Analyte concentration in sample is valid and may be used for complicance purposes. CL = The continuing calibration for this compound is outside of Pace Analytical acceptance limits. M1 = Matrix spike recovery was high: the associated Laboratory Control Spike (LCS) was acceptable. M2 = Matrix spike recovery was Low: the associated Laboratory Control Spike (LCS) was acceptable. P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-7 Summ of Analy Results from BG wells CSA Round 5 Page 6 of 8 TABLE 1-7 SUMMARY OF ANALYTICAL RESULTS FROM SITE BACKGROUND WELLS THROUGH APRIL 2016 MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter Nitrate (as N) Nitrate Potassium Selenium Selenium Selenium Sodium Strontium Strontium Strontium Sulfate Sulfide Thallium Thallium Thallium Total Dissolved Solids Total Organic Carbon Total Suspended Solids Vanadium Vanadium Vanadium Zinc Zinc Zinc Radium-226 Radium-228 TOT DIS DIS (0.1u) TOT TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT DIS DIS (0.1u) TOT Reporting Units mg-N/L mg/I mg/I ug/I ug/I ug/I mg/I ug/I ug/I ug/I mg/I mg/I ug/I ug/I ug/I mg/I mg/I mg/I ug/I ug/I ug/I ug/I ug/I ug/1 pCi/1 pCi/I 15A NCAC 02L Standard 10 10 NE 20 NE NE NE NE NE NE 250 NE NE NE 0.2* 500 NE NE NE NE 0.3* NE NE 1000 NE NE Sample ID Sample Collection Date Analytical Results MW-10BR 12/03/2015 <0.01 NA 3.95 <1 NA <1 37.7 191 NA 198 83 <0.5 <0.2 NA <0.2 320 2 <5 1.67 NA 1.5 <5 NA <5 NA NA MW-10BR 01/07/2016 0.017 NA 4.15 <1 NA <1 39.5 201 NA 195 90 <0.1 <0.2 NA <0.2 300 1.8 <5 1.57 NA 2.68 9 NA <5 NA NA MW-10BR 04/05/2016 <0.01 NA 4.03 <1 NA <1 38.8 192 NA 195 88 <0.1 <0.2 NA <0.2 300 1.9 <5 1.48 NA 1.7 <5 NA <5 0.989 1.77 MW-11BR 06/25/2015 <0.01 NA 5.03 <1 NA <1 14.3 225 NA 200 14 <0.1 <0.2 NA 0.323 250 1.1 <5 2.39 NA 2.69 12 NA <5 NA NA MW-11BR 09/11/2015 0.165 NA 7.29 1.07 NA 1.16 15.6 287 NA 318 16 <0A <0.2 NA <0.2 180 1.2 <5 8.79 NA 9.25 <5 NA <5 NA NA MW-11BR 12/03/2015 0.249 NA 12.1 1.35 1.15 1.04 20.7 242 257 250 15 <0.1 <0.2 0.442 <0.2 150 1 5 11.5 10.8 12.2 14 13 12 NA NA MW-11BR 01/07/2016 0.272 NA 7.93 <1 NA <1 16.6 259 NA 253 16 <0.1 <0.2 NA <0.2 130 0.835 <5 12 NA 12.7 <5 NA <5 NA NA MW-11BR 04/05/2016 0.308 NA 7.68 <1 NA <1 16.5 245 NA 256 14 <0.1 <0.2 NA <0.2 140 0.952 10 13.9 NA 14.5 <5 NA <5 0.33 <3 MW-13BR 06/23/2015 <0.01 NA 5.49 <1 NA <1 25.7 423 NA 418 18 0.115 <0.2 NA <0.2 370 0.9 5 <0.3 NA 0.381 19 NA 36 1.22 <3 MW-13BR 09/08/2015 <0.01 M2 NA 5.31 <1 NA <1 24.8 421 NA 430 12 <0A 0.243 NA 0.538 360 0.859 10 <0.3 NA 0.465 <5 NA 99 NA NA MW-13BR 12/02/2015 <0.01 NA 5.09 <1 NA <1 23.3 398 NA 416 14 <0.2 <0.2 NA <0.2 330 0.761 9 <0.3 NA 0.429 <5 NA 54 NA NA MW-13BR 01/07/2016 <0.01 NA 5.12 <1 NA <1 23.7 402 NA 389 15 <0.1 <0.2 NA <0.2 330 0.647 9 <0.3 NA <0.3 8 NA 37 NA NA MW-13BR 04/05/2016 <0.01 NA 4.72 <1 NA <1 20.8 383 NA 393 17 <0.1 <0.2 NA <0.2 340 0.733 8 <0.3 NA <0.3 <5 NA 9 2.65 <3 MW-14BR 03/12/2015 0.039 NA 4.08 <1 NA <1 33 145 NA 149 12 <1 <0.2 NA <0.2 190 1.3 14 0.758 NA 1.29 8 NA 10 NA NA MW-14BR 09/09/2015 0.011 M2 NA 6.56 <1 NA <1 60.2 157 NA 167 27 <0.1 <0.2 NA <0.2 260 1.3 6 0.498 NA 0.469 5 NA <5 NA NA MW-14BR 12/02/2015 0.112 NA 5.75 NA <1 <1 41.6 NA 136 141 10 <0.1 NA <0.2 <0.2 210 0.822 <5 NA 1.44 1.82 NA <5 <5 NA NA MW-14BR 01/07/2016 0.3B4 NA 4.49 <1 NA <1 37.4 134 NA 131 10 <0.1 <0.2 NA <0.2 180 0.855 <5 2.34 NA 2.45 <5 NA <5 NA NA MW-14BR 04/05/2016 0.346 NA 1 4.06 <1 NA <1 38.4 134 NA 134 1 9.9 <0.1 <0.2 NA <0.2 200 0.873 <5 2.78 NA 2.86 <5 NA <5 0.999 <3 Prepared by: BER Checked by: JAW Notes, = - Bald highlighted concentration indicates exceedance of the 15A NCAC 02L Standard, Appendix 2, April 1, 2013 Spec Cord = Specific Conductance Deg C = Degrees Celsius NTU = Nephelometric turbidity unit DO = Dissolved oxygen DUP = Duplicate umhos/cm = Micro mhos per centimeter NE = Not established ORP = Oxidation -Reduction Potentia S.U. = Standard Unit mg/1 = Milligram per liter DIS = Dissolved Eh = Oxidation Potential ft = Feet my = Millivolts TOT= Total NM = Not measured NA = Not analyzed ug/I = Microgram per liter INC = Not calculated pCi/I = picocuries per liter mg - N/L = Milligram nitrogen per liter < = Concentration not detected at or above the reporting limit = Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013. ' Data invalid. Sample inadvertently collected before well development. B = Target analyte detected in method blank at or above the reporting limit. B1 = Target analyte detected in method blank at or above the reporting limit. B2 = Target analyte was detected In blank(s) at a concentration greater than 1/2 the reporting limit but less than the reporting limit. Analyte concentration in sample is valid and may be used for complicance purposes. CL = The continuing calibration for this compound is outside of Pace Analytical acceptance limits. M1 = Matrix spike recovery was high: the associated Laboratory Control Spike (LCS) was acceptable. M2 = Matrix spike recovery was Low: the associated Laboratory Control Spike (LCS) was acceptable. P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-7 Summ of Analy Results from BG wells CSA Round 5 Page 7 of 8 TABLE 1-7 SUMMARY OF ANALYTICAL RESULTS FROM SITE BACKGROUND WELLS THROUGH APRIL 2016 MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter Uranium-233 Uranium-234 Uranium-236 Uranium-238 As(III) As(V) MMAs DMAs Fe(II) Fe(III) Mn(II) Mn(IV) Reporting Units ug/mL ug/mL ug/mL ug/mL ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I 15A NCAC 02L Standard NE NE NE NE NE NE NE NE NE NE NE NE Sample ID Sample Collection Date Analytical Results MW-10BR 12/03/2015 NA NA NA NA NA NA NA NA NA NA NA NA MW-10BR 01/07/2016 NA NA NA NA NA NA NA NA NA NA NA NA MW-10BR 04/05/2016 <0.00005 <0.00005 <0.00005 0.000188j NA NA NA NA NA NA NA NA MW-11BR 06/25/2015 NA NA NA NA NA NA NA NA NA NA NA NA MW-11BR 09/11/2015 NA NA NA NA NA NA NA NA NA NA NA NA MW-11BR 12/03/2015 NA NA NA NA NA NA NA NA NA NA NA NA MW-11BR 01/07/2016 NA NA NA NA NA NA NA NA NA NA NA NA MW-11BR 04/05/2016 <0.00005 <0.00005 <0.00005 0.000351 NA NA NA NA NA NA NA NA MW-13BR 06/23/2015 <0.00005 <0.00005 <0.00005 <0.0002 NA NA NA NA 1200 <250 483 4.67 MW-13BR 09/08/2015 NA NA NA NA NA NA NA NA NA NA NA NA MW-13BR 12/02/2015 NA NA NA NA NA NA NA NA NA NA NA NA MW-13BR 01/07/2016 NA NA NA NA NA NA NA NA NA NA NA NA MW-13BR 04/05/2016 <0.00005 <0.00005 <0.00005 0.000629 NA NA NA NA NA NA NA NA MW-14BR 03/12/2015 NA NA NA NA NA NA NA NA NA NA NA NA MW-14BR 09/09/2015 NA NA NA NA NA NA NA NA NA NA NA NA MW-14BR 12/02/2015 NA NA NANA NA NA MW-14BR 01/07/2016 NA NA NA N� N� NA NA NA NA NA NA NA MW-14BR 04/05/2016 <0.00005 <0.00005 <0.00005 0.000241 NA NA NA NA NA NA NA NA Prepared by: BER Checked by: JAW Notes, = - Bald highlighted concentration indicates exceedance of the 15A NCAC 02L Standard, Appendix 2, April 1, 2013 Spec Cord = Specific Conductance Deg C = Degrees Celsius NTU = Nephelometric turbidity unit DO = Dissolved oxygen DUP = Duplicate umhos/cm = Micro mhos per centimeter NE = Not established ORP = Oxidation -Reduction Potential S.U. = Standard Unit mg/I = Milligram per liter DIS = Dissolved Eh = Oxidation Potential ft = Feet my = Millivolts TOT= Total NM = Not measured NA = Not analyzed ug/I = Microgram per liter INC = Not calculated pCi/I = picocuries per liter mg - N/L = Milligram nitrogen per liter < = Concentration not detected at or above the reporting limit = Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013. ' Data invalid. Sample inadvertently collected before well development. B = Target analyte detected in method blank at or above the reporting limit. B1 = Target analyte detected in method blank at or above the reporting limit. B2 = Target analyte was detected In blank(s) at a concentration greater than 1/2 the reporting limit but less than the reporting limit. Analyte concentration in sample is valid and may be used for complicance purposes. CL = The continuing calibration for this compound is outside of Pace Analytical acceptance limits. M1 = Matrix spike recovery was high: the associated Laboratory Control Spike (LCS) was acceptable. M2 = Matrix spike recovery was Low: the associated Laboratory Control Spike (LCS) was acceptable. P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-7 Summ of Analy Results from BG wells CSA Round 5 Page 8 of 8 TABLE 1-8 GROUNDWATER MONITORING PLAN (2016) MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC PARAMETER I RL JUNITS IMETHOD FIELD PARAMETERS pH NA SU Field Water Quality Meter Specific Conductance NA µS/cm Field Water Quality Meter Temperature NA 0C Field Water Quality Meter Dissolved Oxyqen NA mq/L Field Water Quality Meter Oxidation Reduction Potential NA mV Field Water Quality Meter Eh NA mV Field Water Quality Meter Turbidity NA INTU I Field Water Quality Meter INORGANICS Aluminum 0.005 mg/L EPA 200.7 or 6010C Antimony 0.001 mg/L EPA 200.8 or 6020A Arsenic 0.001 mg/L EPA 200.8 or 6020A Barium 0.005 mg/L EPA 200.7 or 6010C Boron 0.05 mg/L EPA 200.7 or 6010C Chromium 0.001 mg/L EPA 200.7 or 6010C Cobalt 0.001 mg/L EPA 200.8 or 6020A Copper 0.001 mg/L EPA 200.8 or 6020A Hexavalent Chromium 0.00003 mg/L EPA 218.7 Iron 0.01 mg/L EPA 200.7 or 6010C Lead 0.001 mg/L EPA 200.8 or 6020A Manganese 0.005 mg/L EPA 200.7 or 6010C Mercury 0.00005 mg/L EPA 245.1 Molybdenum 0.001 mg/L EPA 200.8 or 6020A Nickel 0.001 mg/L EPA 200.8 or 6020A Selenium 0.001 mg/L EPA 200.8 or 6020A Strontium 0.005 mg/L EPA 200.7 or 6010C Thallium (low level) 0.0002 mg/L EPA 200.8 or 6020A Vanadium (low level) 0.0003 mg/L EPA 200.8 or 6020A Zinc 10.005 m /L EPA 200.7 or 6010C RADIONUCLIDES Radium 226 1 pCi/L EPA 903.1 Modified Radium 228 3 pCi/L IEPA 904.0/SW846 9320 Modified Uranium 233, 234, 236, 238 Varies by isoto e µg/ml- ISW846 3010A/6020A ANIONS/CATIONS/OTHER Alkalinity (as CaCO3) 20 mg/L SM 2320B Bicarbonate 20 mg/L SM 2320 Calcium 0.01 mg/L EPA 200.7 Carbonate 20 mg/L SM 2320 Chloride 0.1 mg/L EPA 300.0 or 9056A Hardness NA mg/L as CaCO3 EPA 130.1 Magnesium 0.005 mg/L EPA 200.7 or 6010C Nitrate + Nitrite 0.023 mg-N/L EPA 353.2 Potassium 0.1 mg/L EPA 200.7 Methane 0.01 mg/L RSK - 175 Sodium 0.05 mg/L EPA 200.7 Sulfate 0.1 m L EPA 300.0 or 9056A Sulfide 0.1 mq/L SM 4500 S2 D Total Dissolved Solids 25 mg/L SM 2540C Total Organic Carbon 0.1 mg/L SM5310C/EPA9060A Total Suspended Solids 2 m L SM 2450D Prepared by: JAW Checked by: BER Notes: 1. Inorganics analyzed for total and dissolved (0.45 micron) concentrations. NA indicates not applicable. P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 1-8 Groundwater Monitoring Parameters 2016 Mayo.xlsx Page 1 of 1 TABLE 2-1 DEQ GLOBAL CSA COMMENTS FOR DEP SITES MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Number General Comment General Response to Comment 1 DEQ requests determination of 'provisional' background Provisional background groundwater concentrations were concentrations (for groundwater in particular). It is understood provided in the CAP Part 1 reports. Updated provisional that until a sufficient background data set becomes available to do background groundwater concentrations are included in this CSA statistical analysis the term 'provisional background Supplement 1 report. concentrations' will be used. Duke is to propose 'provisional background concentrations' and DEQ will determine background concentrations. 2 Provisional background concentrations should be determined for Provisional background concentrations were provided in the CAP each flow zone (hydrostratigraphic unit) at each facility while Part 1 reports and presented for each media type (soil, sediment, considering similar subsurface geochemical conditions and site- surface water) and hydrogeologic flow zone. Updated provisional specific conditions (e.g. , oxic versus anoxic conditions). background groundwater concentrations are included in this CSA Supplement 1. 3 Geochemical controls (e.g. , pH, DO, and Eh-redox) associated Geochemical controls were discussed in the CAP Part 1 and CAP with contaminant migration should be considered in Site Part 2 documents. PHREEQC geochemical modeling and pH/Eh Conceptual Model. Eh maps similar to pH maps would be useful maps were included in the discussion. for this purpose. 4 Some soil sample analytical detection limits were greater than the Models and risk assessment evaluations used the method NC Soil Protection of Groundwater goals. Soil analysis method detection limit as a conservative approach when detection limits detection limits should be as close as possible to these values. were greater than groundwater protection goals. The lab is aware of the need to use the lowest detection limit possible for soil samples. Soil matrix interference and other factors limit the technical practicality of achieving detection limits at or below the screening level values. 5 Source characterization evaluations should include primary and Geochemical and fate and transport model evaluations provided secondary soil source contributions (i.e., leaching of ash in the CAP considered these mechanisms. constituents onto soil, leaching of naturally occurring constituents from native soils, leaching due to changing geochemical conditions). P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\ Table 2-1 DEQ Global Comments.xlsx Page 1 of 4 TABLE 2-1 DEQ GLOBAL CSA COMMENTS FOR DEP SITES MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Number General Comment General Response to Comment 6 COIs should be developed based upon results from pore water, Constituents exceeding the 2L standard have been included in the groundwater and other media. Include hexavalent chromium as CAP. The risk assessment screening process is consistent with COI due to interest in water supply well results. EPA's approach for determining the constituents that need to be evaluated ("Human and Ecological Risk Assessment of Coal Combustion Wastes," USEPA, April 2010, RIN 2050-AE81). Provisional background concentrations for hexavalent chromium in groundwater are being developed. 7 Groundwater results should be mapped and presented in cross- The CSA Supplement 1 graphics address this comment. sectional view to the detection limit rather than just to 2L. Cross - sections should include geologic features and chemical contours. Discuss in text where difficult to contour due to background or other site conditions. 8 Well construction and integrity should be considered when In post-CSA activities, wells have been redeveloped or replaced analyzing the groundwater data. Monitoring wells that exhibit as necessary. Turbid sample data (samples with turbidity >10 high pH or turbidity should be redeveloped or replaced. Data NTUs) have been screened from use in statistical analysis using from samples with >10NTUs should be screened prior to use in professional judgement where samples may have been visually statistical analysis. clear or the turbidty was close to 10 NTUs. 9 Address influence of ash impoundments on subsurface Geochemical controls and PHREEQC geochemical modeling were geochemistry and how that may influence contaminant discussed in the CAP Part 1 and CAP Part 2 documents. distribution related to CCRs or cause metals to leach from native soils. 10 Provide vertical gradient maps/figures illustrating flow paths, Vertical gradient maps were included in the CAP Part 1 reports. areas of recharge and discharge. Provide plan view map. 11 Show surface water features on base maps and cross -sections. Maps and cross -sections include surface water features where applicablle. 12 Tabulate analytical results for water supply wells, including A map of the water supply wells sampled by DEQ and a tabulation strontium, and provide information on maps. of the most recent data is provided in this CSA Supplement 1 report. Maps and cross -sections showing the distribution of strontium are also provided within this supplemental report. P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\ Table 2-1 DEQ Global Comments.xlsx Page 2 of 4 TABLE 2-1 DEQ GLOBAL CSA COMMENTS FOR DEP SITES MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Number General Comment General Response to Comment 13 Include analysis for total uranium, radium-226, and radium-228 Key wells located in background, below ash basin, and in background, below ash basin, immediate downgradient, and downgradient of the ash basin have been sampled for total other downgradient locations. Use Federal MCL for standard for uranium, Ra 226, and Ra 228. These parameters are also Ra 226, Ra 228, and U. included in the 2016 monitoring plan. 14 COPCs (or COI's) should be modeled using site specific Kd values Agreed, it is anticipated that the various models (i.e., or a technical basis provided as to why the modeling or site geochemical, flow and transport) will be updated as additional specific Kd for a parameter could not be conducted. The models data relevant to the models becomes available. should be "living entities" and updated as more information becomes available that could change or confirm the outcome of the models. 15 Appropriate PSRG for chromium is hexavalent chromium due to its The PSRC for hexavalent chromium is being used in post -CSA toxicity drives the risk for the constituent. reports for data comparison purposes. 16 Potential receptors identified as part of the risk assessment should Recreational users of surface water were identified as potential include non -trespassing recreational users of surface water bodies receptors and evaluated as part of the Risk Assessment provided such as boaters and water supply wells. in the CAP 2 reports. At most locations, water supply wells are not located downgradient of the facility and therefore the risk assessment considered the pathway incomplete. Where downgradient water supply wells were identified, the data was evaluated by Haley and Aldrich, Inc. in various reports (2015 and 2016). 17 For isoconcentration contour maps, provide contours for Revised isoconcentation maps with contour lines indicating concentrations above the reporting limit/PQL. Use inferred concentrations above the reporting limit are included in this (dashes) lines where appropriate. document. Where appropriate, inferred lines are used. 18 Data collected to support CSAs should be incorporated into maps, The requested information has been included in various reports narratives and provided in CAPs (water supply, seep, SW, including the CSA report, CAP Part 1, CAP Part 2, and this CSA sediment, background). Data collected prior to CAMA activities Supplement 1 report. should also be included. P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\ Table 2-1 DEQ Global Comments.xlsx Page 3 of 4 TABLE 2-1 DEQ GLOBAL CSA COMMENTS FOR DEP SITES MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Number General Comment General Response to Comment 19 2L exceedances related to naturally occurring conditions cannot Noted. Initial provisional background concentrations were be confirmed until, at a minimum, provisional background presented in the CAP Part 1 report based upon the data available concentrations are determined. Dynamic redox and geochemical at the time. Updated provisional background concentrations are conditions can liberate naturally occurring metals (e.g. , As, Fe, presented in this CSA Supplement 1 report using 5 or 6 data sets Mn) from soil and aquifer media. as available. Duke anticipates at least 8 rounds of data from the new background wells will be used to statistically develop background concentrations. Geochemical modeling has been conducted to assess dynamic redox and geochemical conditions. 20 Surface water hydrology (e.g. , wetlands, tributaries, etc.) as it A discussion of groundwater and surface water interaction was relates to groundwater modeling or risk assessment provided in the CAP Part 1 and site data was incorporated into th considerations should be included in the CAP. groundwater models. Stream information was incorporated in the modeling and risk assessments. Prepared by: JAW Checked by: KWW P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\ Table 2-1 DEQ Global Comments.xlsx Page 4 of 4 TABLE 2-2 RADIOLOGICAL ANALYTICAL RESULTS MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter Radium-226 Radium-228 Total Radium Uranium-233 Uranium-234 Uranium-236 Uranium-238 Total Uranium Reporting Units pCi/L pCi/L pCi/L ug/mL ug/mL ug/mL ug/mL ug/mL Federal MCL --- --- 5 --- --- --- --- 0.03 Sample ID Sample Collection Date Analytical Results Background BG-1 04/04/2016 2.25 <3 2.25 <0.00005 <0.00005 <0.00005 <0.0002 <RL BG-2 04/04/2016 4.07 <3 4.07 <0.00005 <0.00005 <0.00005 0.00102 0.00102 MW-12D 04/05/2016 6 <3 6 <0.00005 <0.00005 <0.00005 0.000233 0.000233 MW-12S 06/24/2015 0.84 <3 0.84 <0.00005 <0.00005 <0.00005 <0.0002 <RL MW-12S 04/06/2016 0.537 <3 0.537 <0.00005 <0.00005 <0.00005 0.000217 0.000217 MW-10BR 04/05/2016 0.989 1.77 2.759 <0.00005 <0.00005 <0.00005 0.000188 j 0.000188 j MW-11BR 04/05/2016 0.33 <3 0.33 <0.00005 <0.00005 <0.00005 0.000351 0.000351 MW-13BR 06/23/2015 1.22 <3 1.22 <0.00005 <0.00005 <0.00005 <0.0002 <RL MW-13BR 04/05/2016 2.65 <3 2.65 <0.00005 <0.00005 <0.00005 0.000629 0.000629 MW-14BR 04/05/2016 0.999 <3 0.999 <0.00005 <0.00005 <0.00005 0.000241 0.000241 Surficial MW-3 1 06/23/2015 3.13 <3 3.13 <0.00005 <0.00005 <0.00005 0.00173 0.00173 Transition Zone CW-2 07/07/2015 1.61 <3 1.61 <0.00005 <0.00005 <0.00005 0.000257 0.000257 Bedrock ABMW-2BRL 04/05/2016 3.51 3.89 7.4 <0.00005 <0.00005 <0.00005 0.00151 0.00151 CW-2D 07/07/2015 0.792 <3 0.792 <0.00005 <0.00005 <0.00005 0.000354 0.000354 Prepared by: BER Checked by: JAW Notes• = - Concentration greater than the Federal MCL (https://www.epa.gov/sites/production/files/2016-06/documents/npwdr_complete_table.pdf) < = concentration not detected at or above reporting limit j = indicates concentration reported below Practical Quantitation Limit (PQL), but above Method Detection Limit (MDL) and therefore concentration is estimated. RL = reporting limit pCi/L = picocuries per liter ug/mL = micrograms per milliliter P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 2-2 Radiological Analytical Results Page 1 of 1 TABLE 3-1 SURFACE WATER ANALYTICAL RESULTS MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter pH Temp Spec Cond DO ORP Eh Turbidity Ferrous Iron Alkalinity Aluminum Aluminum Antimony Antimony Arsenic Arsenic Barium Barium Beryllium Beryllium Bi- carbonate AlkalinityDIS Boron Boron Cadmium Cadmium Calcium DIS TOT DIS TOT DIS TOT DIS TOT DIS TOT TOT DIS TOT TOT Reporting Units S.U. Deg C u� cos mg/I mV mV NTUs mg/I mg/I ug/I ug/I ug/I ug/1 ug/1 ug/I ug/I ug/I ug/l ug/l mg/I ug/l ug/I ug/I ug/l mg/l 15A NCAC 02B / EPA Water Supply April 2015 NE NE NE NE I NE NE NE NE NE NE 6500 NE 5.6 NE 30 NE 1 1000 NE NE NE NE NE NE NE NE 15A NCAC 02B / EPA Human Health April 2015 5-9 NE NE NE NE NE 25 NE NE NE 8000 NE 640 NE 30 NE 200000 NE NE NE NE NE NE NE NE 15A NCAC 02B / EPA Ecological April 2015 6.5-9 NE NE 5 NE NE 25 NE NE NE 87 NE NE 150 NE NE NE 6.5 NE NE NE NE 0.15 NE NE 15A NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE NE NE NE 1* NE 10 NE 700 NE 4* NE NE 700 NE 2 NE Sample ID Sample Collection Date Field Parmeters Analytical Results SW-CB1 05/13/2015 6.2 15 329 4.2 162 367 14.8 NM 47 9 965 <1 <1 <1 <1 85 101 <1 <1 47 1140 1150 <1 <1 25.5 SW-CB1 10/13/2015 6.4 16 417 3.1 13 218 6.53 NM 46 <5 56 <1 <1 <1 <1 71 75 <1 <1 46 1300 1310 <1 <1 29.4 SW-CB1 02/02/2016 7.0 12 247 11 48 253 8.03 0 20.8 8 425 <1 <1 <1 <1 66 65 <1 <1 20.8 634 637 <1 <1 17.1 SW-CB2 05/13/2015 6.6 22 276 0.68 -62 143 27.4 NM 63 38 148 <1 <1 <1 1.06 84 89 <1 <1 63 448 455 <1 <1 16.9 SW-CB2 10/13/2015 6.6 18 231 1.1 22 227 17.1 NM 45 15 147 <1 <1 <1 <1 61 69 <1 <1 45 414 422 <1 <1 16.8 SW-CBT1 02/02/2016 7.2 11 116 11.6 126 331 4.71 0 30.7 15 297 <1 <1 <1 <1 25 28 <1 <1 30.7 <50 <50 <1 <1 7.84 SW-REFl 05/13/2015 6.7 18 117 2.58 119 324 16 NM 41 23 111 <1 <1 <1 <1 31 34 <1 <1 41 <50 <50 <1 <1 8.24 SW-REF1 10/13/2015 7.2 16 132 2.3 61 266 17.7 NM 39 16 754 <1 <1 <1 <1 35 51 <1 <1 39 <50 <50 <1 <1 8.57 Notes: 0 - Total metal concentration greater than the 15A NC 02B/EPA Water Supply Criteria, 2015(NC), 2013(EPA) - Total metal concentration greater than the 15A NC 02B/EPA Human Health Criteria, 2015(NC), 2013(EPA) 0 - Total metal concentration greater than the 15A NC 02B/EPA Ecological Criteria, 2015(NC), 2013(EPA) 0 - Total metal concentration greater than the 15A NCAC 02L Standard, Appendix 2, April 1, 2013. * - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April, 1, 2013. < = concentration not detected at or above reporting limit ug/I = microgram per liter Deg C = Degree Celsius mg/I = milligrams per liter DO = Dissolved Oxygen umhos/cm = micro mhos per centimeter ORP = Oxidation Reduction Potential NTU = Nephelometric Turbidity Unit Spec Cond = Specific Conductance S.U. = Standard Unit Eh = Redox Potential mV = millivolts DIS = Dissolved Temp = Temperature NM = Not Measured NA = Not Analyzed NE = Not Established mg-N/L = miligram nitrogen per liter TOT = Total Prepared by: BER Checked by: JAW P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 3-1 Surface Water Analytical Results.xlsx Page 1 of 3 TABLE 3-1 SURFACE WATER ANALYTICAL RESULTS MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter Carbonate Alkalinity Chloride Chromium (Hexavalent) Chromium Chromium Cobalt Cobalt Copper Copper Iron Iron Lead Lead Magnesium Manganese Manganese Mercury Mercury Methane Molybdenum Molybdenum Nickel Nickel Nitrate (as N) DIS TOT DIS TOT DIS TOT DIS TOT DIS TOT TOT DIS TOT DIS TOT DIS TOT DIS TOT Reporting Units mg/I mg/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/1 mg/I ug/I ug/I ug/1 ug/I ug/I ug/1 ug/I ug/I ug/I mg-N/L 15A NCAC 02B / EPA Water Supply April 2015 NE 250 NE NE NE NE 3 NE 1300 NE I NE I NE NE NE NE 50 NE I NE NE NE 160 NE 25 10 15A NCAC 02B / EPA Human Health April 2015 NE NE NE NE NE NE 4 NE NE NE NE NE NE NE NE 100 NE NE NE NE 2000 NE 4600 NE 15A NCAC 02B / EPA Ecological April 2015 NE 230 NE 11 NE NE NE 2.7 NE NE NE 0.54 NE NE NE NE NE 0.012 NE NE NE 16 NE NE 15A NCAC 02L Standard NE 250 NE NE 30 NE 1* NE 1000 NE 300 NE 15 NE NE 50 NE 1 NE NE NE NE 100 30 Sample ID Sample Collection Date Analytical Results SW-CB1 05/13/2015 <10 58 NA <1 1.25 3.05 4.2 <1 1.65 1600 4320 <1 <1 9.98 2100 2350 NA 0.00595 120 <1 <1 <1 1.52 0.625 SW-CB1 10/13/2015 <10 66 NA <1 <1 1.78 1.68 <1 <1 410 776 <1 <1 11.1 1290 1350 NA 0.00395 52 <1 <1 <1 <1 0.038 SW-CB1 02/02/2016 <5 37 <0.03 <1 <1 <1 <1 <1 <1 230 994 <1 <1 7.08 486 538 <0.05 <0.05 38.4 <1 <1 1.04 1.27 0.109 SW-CB2 05/13/2015 <10 26 NA <1 <1 2.71 2.73 <1 <1 2130 4160 <1 <1 6.57 8240 8330 NA 0.0033 250 <1 <1 <1 <1 0.052 SW-CB2 10/13/2015 <10 28 NA <1 <1 2.73 2.77 <1 <1 743 4360 <1 <1 6.24 3580 3800 NA 0.00332 86 <1 <1 <1 <1 <0.01 M2 SW-CBT1 02/02/2016 <5 6.4 0.07 <1 <1 <1 <1 <1 <1 1 62 353 1 <1 <1 4.21 50 57 <0.05 <0.05 <10 <1 <1 <1 <1 0.487 SW-REF1 05/13/2015 <10 6 NA <1 <1 <1 <1 1.17 1 <1 1 785 1 26601 <1 I <1 1 3.6 1 315 1 338 1 NA 1 0.002 1 35 1 <1 I <1 I <1 I <1 1 0.058 SW-REF1 1 10/13/2015 <10 6.6 NA <1 1.42 <1 4.72 <1 1 1.21 1 525 1 38801 <1 I <1 1 3.51 1 212 1 1180 1 NA 1 0.00532 1 26 1 <1 I <1 I <1 1 1.2 1 <0.01 Notes• 0 - Total metal concentration greater than the 15A NC 02B/EPA Water Supply Criteria, 2015(NC), 2013(EPA) 0 - Total metal concentration greater than the 15A NC 02B/EPA Human Health Criteria, 2015(NC), 2013(EPA) 0 - Total metal concentration greater than the 15A NC 02B/EPA Ecological Criteria, 2015(NC), 2013(EPA) 0 - Total metal concentration greater than the 15A NCAC 02L Standard, Appendix 2, April 1, 2013. * - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April, 1, 2013. < = concentration not detected at or above reporting limit ug/I = microgram per liter Deg C = Degree Celsius mg/I = milligrams per liter DO = Dissolved Oxygen umhos/cm = micro mhos per centimeter ORP = Oxidation Reduction Potential NTU = Nephelometric Turbidity Unit Spec Cond = Specific Conductance S.U. = Standard Unit Eh = Redox Potential my = millivolts DIS = Dissolved Temp = Temperature NM = Not Measured NA = Not Analyzed NE = Not Established mg-N/L = miligram nitrogen per liter TOT = Total Prepared by: BER Checked by: JAW P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 3-1 Surface Water Analytical Results.xlsx Page 2 of 3 TABLE 3-1 SURFACE WATER ANALYTICAL RESULTS MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter Potassium Selenium Selenium Sodium Strontium Strontium Sulfate Sulfide Thallium Thallium Total Dissolved Solids Total Organic Carbon Total Suspended Solids Vanadium Vanadium Zinc Zinc TOT DIS TOT TOT DIS TOT DIS TOT DIS TOT DIS TOT Reporting Units mg/I ug/I ug/I mg/I ug/I ug/I mg/I mg/I ug/I ug/I mg/I mg/I mg/I ug/I ug/I ug/I ug/I 15A NCAC 02B / EPA Water Supply April 2015 NE NE 170 NE NE 14000 250 NE NE 0.24 500 NE NE NE NE NE 7400 15A NCAC 02B / EPA Human Health April 2015 NE NE 4200 NE NE 40000 NE NE NE 0.47 NE NE NE NE NE NE 26000 15A NCAC 02B / EPA Ecological April 2015 NE NE 5 NE NE NE NE NE NE NE NE NE NE NE NE 36 NE 15A NCAC 02L Standard NE NE 20 NE NE NE 250 NE NE 0.2* 500 NE NE NE 0.3* NE 1000 Sample ID Sample Collection Date Analytical Results SW -CBI 05/13/2015 2.09 <1 <1 23.1 411 425 30 <1 <0.2 <0.2 220 2.8 49 <0.3 1.83 12 13 SW-CB1 10/13/2015 2.54 <1 <1 24.4 435 454 33 <0.2 <0.2 <0.2 270 2.3 7 <0.3 <0.3 38 7 SW-CB1 02/02/2016 1.77 <1 <1 15.9 228 231 29 <0.1 <0.2 <0.2 150 1.8 25 <0.3 0.508 29 19 SW-CB2 05/13/2015 2.25 <1 <1 13.7 213 217 5 <0.1 <0.2 <0.2 170 7.8 30 0.397 0.811 8 <5 SW-CB2 10/13/2015 3.07 <1 <1 11.6 202 218 12 <0.1 <0.2 <0.2 160 8.7 14 <0.3 0.805 15 10 SW-CBT1 02/02/2016 1.5 <1 <1 8.41 69 66 13 <0.1 <0.2 <0.2 82 3.2 <5 <0.3 0.402 1<5 SW-REF1 05/13/2015 1.68 <1 <1 8.84 73 74 1.8 <0.1 <0.2 <0.2 120 4.5 5 0.451 1.09 1617 SW-REF1 10/13/2015 2.07 <1 <1 8.58 71 70 4 <0.1 <0.2 <0.2 94 7.6 66 0.36 2.37 76 Notes: 0 - Total metal concentration greater than the 15A NC 02B/EPA Water Supply Criteria, 2015(NC), 2013(EPA) 0 - Total metal concentration greater than the 15A NC 02B/EPA Human Health Criteria, 2015(NC), 2013(EPA) 0 - Total metal concentration greater than the 15A NC 02B/EPA Ecological Criteria, 2015(NC), 2013(EPA) 0 - Total metal concentration greater than the 15A NCAC 02L Standard, Appendix 2, April 1, 2013. * - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April, 1, 2013. < = concentration not detected at or above reporting limit ug/I = microgram per liter Deg C = Degree Celsius mg/I = milligrams per liter DO = Dissolved Oxygen umhos/cm = micro mhos per centimeter ORP = Oxidation Reduction Potential NTU = Nephelometric Turbidity Unit Spec Cond = Specific Conductance S.U. = Standard Unit Eh = Redox Potential my = millivolts DIS = Dissolved Temp = Temperature NM = Not Measured NA = Not Analyzed NE = Not Established mg-N/L = miligram nitrogen per liter TOT = Total Prepared by: BER Checked by: JAW P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 3-1 Surface Water Analytical Results.xlsx Page 3 of 3 TABLE 4-1 PROVISIONAL SURFICIAL GROUNDWATER BACKGROUND CONCENTRATION SUMMARY ROUNDS 1-5 MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter Reporting Units NC21- Standard Number of wells Number of Data Sets Number of Detections Frequency of Detections (ova) Surficial (Alluvial and Saprolite) Detected Background Concentration Range Provisional Background Concentration** pH S.U. 6.5-8.5 1 6 6 100 5.7 - 6.0 5.7 - 8.5 Boron Pg/I 700 1 5 0 0 ND ND Chromium (VI) Pg/I 0.07A 1 3 3 100 0.038 - 0.058 0.058 Cobalt pg/I 1* 1 5 2 40 1.02 - 1.09 1.091, Iron pg/I 300 1 5 5 100 108 - 338 338° Manganese Pg/I 50 1 5 5 100 24 - 267 267° Sodium mg/I NE 1 5 5 100 4.76 - 6.79 6.79" Strontium pg/I NE 1 5 5 100 17 - 27 27A Vanadium pg/I 1 0.3* 1 1 1 5 3 1 60 1 0.313 - 0.408 0.408° vrepdrea Dy: KuLyivit-u l,neCKeD Dy: rrixiurixinna Notes: 0 = Indicates comparative value Well included for analysis: MW-12S Only those parameters for which a 2L or IMAC is exceeded in background wells are included, plus strontium as an indicator parameter. NE = Not Established NO = Not detected above reporting limit pg/I = micrograms per liter S.U. = Standard Unit ^ = NC DHHS Health Screening Level *Interim Maximum Allowable Concentration (IMAC) of the 15A NCAC 02L Standard, Appendix 1, April 2013. **Provisional background concentration is the 95% Upper Prediction Limit. 'Provisional background concentration is the maximum observed background concentration. P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 4-1 Provisional BG Concentrations in Surficial Zone Rounds 1-5.xlsx Page 1 of 1 TABLE 4-2 PROVISIONAL TRANSITION ZONE GROUNDWATER BACKGROUND CONCENTRATION SUMMARY ROUNDS 1-5 MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter Reporting Units NC2L Standard Number of wells Number of Data Sets Number of Detections Frequency of Detections ( o/O) Transition Zone Detected Background Concentration Range Provisional Background g Concentration** pH S.U. 6.5-8.5 2 25 25 100 5.9 - 6.7 5.9 - 8.5 Antimony Ng/1 1* 2 25 2 8 1.44 - 1.63 1.573 Arsenic Ng/1 2 25 0 0 ND ND Barium Ng/1 2 25 25 100 20 - 71 70.4 Boron Ng/1 2 25 0 0 ND ND Chromium ug/1 10 2 25 10 40 1.1 - 10.2 26.56 Chromium (VI) Ng/1 0.07A 2 7 4 57 0.52 - 0.64 1.066 Cobalt Ng/1 1* 2 13 2 15 0.51 - 1.37 1.37° Iron Ng/1 300 2 25 25 100 152 - 1,130 1,727 Manganese Pg/1 50 2 25 25 100 27 - 683 729.4 Sodium mg/1 NE 2 15 15 100 8.76 - 56 56° Strontium Ng/1 NE 2 11 11 100 85 - 391 391° TDS mg/1 2 25 25 100 82 - 430 444 Vanadium Ng/1 0.3* 2 12 11 92 0.637 - 6.63 22.59 Prepared by: KDB/MCD Checked by: EMY/JAW Notes: a = Indicates comparative value Wells included for background analysis: BG-02 and MW-12D Only those parameters for which a 2L or IMAC is exceeded in background wells are included, plus strontium as an indicator parameter. NE = Not Established ND = Not detected above reporting limit NA = Not analyzed mg/1 = milligrams per liter pg/I = micrograms per liter TDS = Total dissolved solids S.U. = Standard Unit A single value in the range column indicates only one detected concentration. NC DHHS Health Screening Level *Interim Maximum Allowable Concentration (IMAC) of the 15A NCAC 02L Standard, Appendix 1, April 2013. **Provisional background concentration is the 95 Percent Upper Prediction Limit. 'Provisional background concentration is the maximum observed background concentration. P:\Duke Energy Progress. 1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 4-2 Provisional Transition Zone BG Concentrations Rounds 1-5.xlsx Page 1 of 1 TABLE 4-3 PROVISIONAL BEDROCK GROUNDWATER BACKGROUND CONCENTRATION SUMMARY ROUNDS 1-5 MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Y Parameter Reporting P g Units NC2L Standard Number of wells Number of Data Sets Number of Detections Frequency of 4 y Detections (%) Bedrock Detected Background Concentration Range Provisional Background Concentration** pH S.U. 6.5-8.5 5 38 38 100 5.1 - 10.3 5.1 - 10.3 Antimony Ng/I 1* 5 38 4 11 1.32 - 1.9 5.089 Barium Ng/I 700 5 38 35 92 5- 105 101.2 Boron Ng/l 700 5 38 1 3 65 65 Chromium Ng/l 10 5 38 14 37 1 - 24.1 66.79 Chromium (VI) Ng/1 0.07A 5 15 6 40 0.19 - 18.4 62.35 Cobalt Ng/l 1* 5 26 4 15 1.01 - 1.41 4,244 Iron Ng/I 300 5 38 38 100 29 - 2,730 4,663 Lead Ng/l 15 5 38 1 3 0.13 0.13 Manganese Ng/1 50 5 38 38 100 7-348 630.9 Sodium mg/1 NE 5 26 26 100 11.5 - 60.2 68.6 Strontium Ng/1 NE 5 24 24 100 131 - 430 427 Thallium Ng/l 0.2* 5 38 2 5 0.323 - 0.538 0.334 TDS mg/1 500 5 38 38 100 106 - 370 360.5 Vanadium Ng/1 0.3* 5 25 23 92 0.381 - 14.5 34.19 Prepared by: KDB\MCD Checked by: EMY\BDW Notes: 0 = Indicates comparative value Wells included for background analysis: BG-01, MW-10BR, MW-11BR, MW-13BR and MW-14BR NE = Not Established ND = Not detected above reporting limits NA = Not analyzed mg/I = milligrams per liter pg/I = micrograms per liter TDS = Total dissolved solids S.U. = Standard Unit Only those parameters for which a 2L or IMAC is exceeded in background wells are included, plus strontium as an indicator parameter. A single value in the range column indicates only one detected concentration. = NC DHHS Health Screening Level *Interim Maximum Allowable Concentration (IMAC) of the 15A NCAC 02L Standard, Appendix 1, April 2013. **Provisional background concentration is the 95% Upper Prediction Limit. 'Provisional background concentration is the maximum observed background concentration. P:\Duke Energy Progress. 1026\105. Mayo Ash Basin GW Assessment Plan\39.EG_CSASUP\Tables\Table 4-3 Provisional Bedrock BG Concentrations Rounds 1-5.xlsx Page 1 of 1 TABLE 4-4 SURFICIAL GROUNDWATER EXCEEDANCES INCORPORATING PROVISIONAL BACKGROUND MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter y PH Water Level Temp Spec Cond DO ORP Eh Turbidity Ferrous Iron Boron Chromium (VI) Chromium (VI) Speciation Cobalt Iron Manganese Sodium Strontium Vanadium Reporting Units S.U. ft Deg C umhos/cm mg/1 mV mV NTUs mg/1 ug/l ug/l ug/l ug/1 ug/l ug/l mg/l ug/l ug/l 15A NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE 700 0.07A 0.07A 1* 300 50 NE NE 0.3* Provisional Background 5.7-8.5 NE I NE NE NE I NE NE NE NE NE 0.058 0.058 1.09 1 338 267 6.79 27 0.408 Sample ID Sample Collection Date Field Parameters Background MW-12S 06/18/2015 5.7 30.61 21 55 3.66 127 332 10.6 <0.5 <50 NA NA 1.09 295 267 6.79 27 0.403 MW-12S 09/10/2015 5.8 31.69 20 47 2.3 34 239 6.31 0 <50 NA NA 1.02 108 253 5.43 23 <0.3 MW-12S 12/02/2015 5.7 32.15 17 68 2.7 159 364 6.9 NM <50 0.043 NA <1 336 152 5.08 21 0.313 MW-12S 01/07/2016 5.8 31.69 10 111 2.86 185 390 9.89 0 <50 0.038 NA <1 178 68 4.76 18 <0.3 MW-12S 04/06/2016 5.8 29.91 14 46 2.91 159 364 7.42 NM <50 0.058 NA <1 338 24 5.49 17 0.408 Alluvial MW-3 03/19/2015 5.7 6.51 11 343 1.65 304 509 3.35 NM 847 NA NA <1 34 880 22 336 <0.3 MW-3 06/23/2015 6.0 6.63 17 360 0.6 310 515 2.09 NM NA NA 0.155 NA NA NA NA NA NA MW-3 09/08/2015 6.0 6.87 19 372 1.7 210 415 0.58 0 1050 NA NA <1 21 1210 23.7 342 0.384 MW-3 12/03/2015 5.7 6.41 14 348 1 212 417 0.29 0 930 0.2 NA <1 10 1310 22.9 328 <0.3 MW-3 01/06/2016 5.9 6.43 11 322 0.81 370 575 0.66 0 896 0.17 M1 NA <1 <10 1420 22.8 328 <0.3 MW-3 DUP 01/06/2016 5.9 6.43 11 322 0.81 370 575 0.66 0 889 0.17 NA <1 <10 1420 22.7 326 <0.3 MW-16S 06/23/2015 6.0 3.88 30 144 1.68 96 301 3.44 NM <50 NA 0.011 4.32 860 260 11.2 109 0.303 MW-16S 09/09/2015 6.5 4.03 23 172 2.6 -20 185 4.4 2 <50 NA <0.007 10.3 3860 768 9.54 131 <0.3 MW-16S 12/04/2015 6.8 3.34 13 166 1.81 -6 199 4.46 1.5 <50 <0.03 NA 6 1200 530 15.8 120 <1 MW-16S 01/07/2016 6.4 3.25 7 146 3.46 99 304 9.39 0.5 <50 0.083 NA 2.11 520 252 15.6 113 <0.3 Saprolite ABMW-3S 06/17/2015 5.2 17.26 23 137 0.2 8 213 4.96 2.5 1100 NA NA 3.98 2630 478 19.4 59 <0.3 ABMW-3S 09/10/2015 5.4 18.21 24 166 0.7 40 245 4.02 3 1130 NA NA 5.33 10400 918 18.7 92 <0.3 ABMW 3S 12/01/2015 5.8 17.11 12 96 1 140 345 3.95 0 635 <0.03 NA 1.82 465 282 13.5 55 <0.3 ABMW-3S 01/05/2016 5.4 16.95 7 128 0.62 112 317 1.59 1.5 1220 <0.03 NA 3.42 4340 531 17.1 78 <0.3 Notes: 0- Concentration greater than 2L/IMAC or Provisional Background Concentration ug/I = microgram per liter Deg C = Degree Celsius mg/I = milligrams per liter NE = Not Established umhos/cm = micro mhos per centimeter DO = Dissolved Oxygen NTU = Nephelometric Turbidity Unit ORP = Oxidation Reduction Potential S.U. = Standard Unit Spec Cond = Specific Conductance mV = millivolts Eh = Redox Potential * - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April, 1, 2013. < = concentration not detected at or above reporting limit Values indicated in red associated with sample turbidity greater than 10 NTU. M1 = Matrix spike recovery was high: the associated Laboratory Control Spike (LCS) was acceptable. ^ = NC DHHS Health Screening Level. Temp = Temperature NO = Not detected above reporting limit NM = Not Measured NA = Not Analyzed ft = feet Prepared by: BER Checked by: JAW P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 4-4 Surficial GW Exceedances Incorporating Provisional Background.xlsx Page 1 of 1 TABLE 4-5 TRANSITION ZONE GROUNDWATER EXCEEDANCES INCORPORATING PROVISIONAL BACKGROUND MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter pH ater `Level Temp Spec Coed DO ORP Eh Turbidity Ferrous Iron Antimony Arsenic Barium Boron Cadmium Chromium (VI) Chromium (VI) Speciation Chromium Cobalt Iron Manganese Sodium Strontium Total Dissolved Solids Vanadium Reporting Units S.U. ft Deg C umhos/cm mg/l mV mV NTUs mg/l ug/l ug/1 ug/l ug/l ug/l ug/I ug/l ug/l ug/l ug/l ug/1 mg/1 ug/1 mg/I ug/l 15A NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE 1* 10 700 700 2 0.07A 0.07A 10 1* 300 50 NE NE Soo 0.3* Provisional Background 5.9-8.5 NE NE NE NE NE NE NE NE 1.573 NE 70.4 NE NE 1.066 1.066 26.56 1.37 1727 729.4 56 391 444 22.59 Sample ID Sample Collection Date Field Parameters Analytical Results Background BG-2 12/02/2010 6.6 35.57 19 576 NM NM NM 13 NM <0.5 <5 81.8 <50 <0.08 NA NA 6.7 NA 2660 198 NA NA 349 NA BG-2 04/20/2011 6.3 33.35 21 623 1.26 7 212 12.1 NM <0.5 <5 61.3 <50 <0.08 NA NA <5 NA 439 71.4 NA NA 382 NA BG-2 07/11/2011 6.3 35.45 26 706 0.32 -77 128 9.2 NM <0.5 <5 64.8 B <50 <0.08 NA NA 10.2 NA 559 64.2 NA NA 367 B NA BG-2 11/03/2011 6.3 35.90 17 671 0.67 -98 107 5.63 NM <0.5 <S 67.7 <50 <0.08 NA NA 7.5 NA 312 36.7 NA NA 341 NA BG-2 04/04/2012 6.3 35.71 21 647 0.34 -93 113 5.55 NM <0.5 <5 61.5 <50 <0.08 NA NA <5 NA 152 27 NA NA 412 NA BG-2 07/09/2012 6.3 35.94 20 652 0.51 -78 127 9.47 NM <0.5 <5 53.4 <50 <0.08 NA NA 5.9 NA 460 54.9 NA NA 382 NA BG-2 11/05/2012 6.3 36.20 17 640 0.51 90 295 9.02 NM <0.5 1 <5 60.2 1 <50 <0.08 NA NA 6 NA 759 43.7 NA NA 389 NA BG-2 04/10/2013 6.3 35.33 18 725 0.17 -17 188 8.5 NM <1 <1 66 <50 <1 NA NA <5 NA 646 111 NA NA 430 NA BG-2 07/09/2013 6.4 34.66 19 695 0.31 -120 85 8.08 NM <1 <1 69 <50 <1 NA NA <5 NA 1130 248 NA NA 430 NA BG-2 11/13/2013 6.4 34.40 17 658 0.1 18 223 9.5 NM <1 <1 62 <50 <1 NA NA <5 NA 841 177 NA NA 360 NA BG-2 04/01/2014 6.4 33.78 17 709 0.2 68 273 7.5 NM <1 <1 71 <50 <1 NA NA <5 NA 943 226 NA NA 450 NA BG-2 07/18/2014 6.4 33.20 18 664 0.14 2 207 7.71 NM <1 <1 65 <50 <1 NA NA <5 NA 1010 244 NA NA 400 NA BG-2 11/12/2014 6.3 33.02 18 630 0.12 21 226 5.33 NM <1 <1 61 <50 <1 NA NA <5 NA 647 180 NA NA 370 NA BG-2 04/13/2015 6.3 31.93 18 652 0.2 -11 194 7.09 NM <1 <1 54 <50 <1 NA NA <5 <1 435 ISO 49.7 NA 380 NA BG-2 CUP 04/13/2015 6.3 31.93 18 652 0.2 -11 194 7.09 NM <1 <1 55 <50 <1 NA NA <5 <1 546 155 50.3 NA 360 NA BG-2 07/07/2015 6.5 31.53 19 623 0.3 -129 76 8.51 NM <1 <1 54 <50 <1 NA <0.021 <5 <1 467 135 48.2 NA 370 5.88 BG-2 09/11/2015 6.4 31.49 18 537 0.03 -40 165 6.88 0 <1 <1 50 <50 <1 NA NA 4.05 <1 244 130 44.6 291 330 4 BG-2 11/03/2015 6.7 31.89 18 14 7.88 59 264 11.3 NM <1 <1 51 <50 <1 NA NA <5 <1 513 102 46.7 318 350 6.63 BG-2 12/09/2015 6.4 31.68 16 612 0.71 3 208 5.24 0.25 <0.5 <0.5 60 <50 <0.08 <0.03 NA <0.5 B <0.5 450 200 51.3 390 314 5.8 BG-2 01/08/2016 6.4 31.23 17 588 0.9 -16 189 1.98 0.5 <1 <1 58 <50 <1 <0.03 NA <1 <1 471 196 50.6 350 370 4.2 BG-2 04/04/2016 6.4 30.42 18 651 0.15 139 344 2.71 0.5 <1 <1 65 <50 <1 <0.03 NA <5 <1 585 237 56 391 360 5 MW-12D 06/24/2015 6.2 31.15 17 136 2.42 -1 204 4.02 0 1.63 <1 26 <50 <1 NA NA <1 1.37 326 683 8.98 95 120 0.719 MW-12D 06/25/2015 6.2 31.10 17 124 2.72 29 234 4.5 0 NA NA NA NA NA NA 0.334 NA NA NA NA NA NA NA NA MW-12D 09/10/2015 6.2 32.10 17 125 2.6 39 244 3.88 0 <1 <1 20 <50 <1 NA 0.357 1.1 <1 277 218 9.03 85 100 0.637 MW-12D 12/02/2015 6.0 32.50 16 135 3.4 135 340 11.3 0 1.44 <1 21 <50 <1 0.55 NA 3.43 <1 504 193 9.18 90 97 1.01 MW-12D DUP 12/02/2015 6.0 32.50 16 135 3.4 135 340 11.3 0 <1 <1 20 <50 <1 0.64 NA 3.13 <1 393 193 9.24 91 69 0.768 MW-12D 12/04/2015 6.1 32.83 18 122 3.35 140 345 8.08 0 <0.5 <0.5 20 <50 0.099 0.64 MI NA 4.6 0.51 280 160 9.56 85 122 <1 MW-12D 01/07/2016 6.1 31.95 15 118 3.1 136 341 9.26 NM <1 <1 22 <50 <1 0.52 Ml NA 2.99 <1 968 131 8.76 87 82 1.65 MW-12D 04/05/2016 5.9 30.28 16 125 3.45 120 325 9.9 NM <1 <1 21 <50 <1 0.6 NA 1.64 <1 385 100 9.35 92 120 1.06 Transition Zone ABMW-4D 06/22/2015 6.6 6.04 24 1174 0.7 231 436 2.03 4.5 3.68 140 755 5090 <1 NA <0.005 <1 6.71 28300 3640 22.9 3070 680 23.3 ABMW-4D 09/09/2015 6.6 7.92 27 1245 0.5 -128 77 4.04 7 <1 143 953 4610 <1 NA NA <1 3.38 44400 4550 20.5 2660 700 11.7 ABMW-4D 12/01/2015 6.6 6.41 18 873 0.2 -153 52 14.34 6.5 <1 84.2 990 3950 <1 <0.03 NA 1.49 3.82 60300 5250 17.6 2140 540 12.1 ABMW-4D 01/05/2016 6.0 6.10 10 1237 0.8 -102 103 9.26 NM <1 60.9 1080 4010 <1 <0.03 NA <1 3.95 72100 6650 18.2 2070 630 6.01 CW-1 12/06/2010 6.7 19.84 16 236 NM NM NM 8.4 NM <0.5 <5 6 <50 0.082 NA NA <5 NA <50 104 NA NA 147 NA CW-1 07/09/2013 5.6 18.06 21 169 2.83 -22 184 2.05 NM <1 <1 <5 <50 2.19 NA NA <5 NA 21 8 NA NA 140 NA CW-1 04/13/2015 5.7 16.99 19 178 3.8 310 515 2.63 NM <1 <1 6 <50 1.23 NA NA <5 <1 608 27 17.3 NA 160 NA CW-1 07/08/2015 5.5 17.65 20 182 3.3 187 392 3 NM <1 <1 <S <50 <1 NA NA <5 <1 31 6 17 NA 150 0.543 CW-1 09/11/2015 5.7 19.42 20 180 2.5 210 415 2.75 0 <1 <1 <5 <50 <1 NA NA <1 <1 93 10 17.1 71 140 0.687 CW-1 11/04/2015 5.8 18.24 18 189 3.94 158 363 5.07 NM <1 <1 12 67 <1 NA NA 53 <1 142 29 16.7 92 130 0.661 CW-1 04/04/2016 6.0 17.10 18 180 3.54 159 364 1.3 0 <1 <1 7 <50 <1 NA NA <5 <1 366 13 18.2 89 160 1.1 CW-2 04/05/2012 5.6 13.61 13 243 1.19 -40 165 1.02 NM <0.5 <S 105 459 <0.08 NA NA <5 NA <50 107 NA NA 140 NA CW-2 07/10/2012 5.3 15.05 18 303 0.74 -66 139 1.3 NM <0.5 <5 95.2 590 0.12 NA NA <5 NA <50 184 NA NA 186 NA CW-2 11/05/2012 5.5 14.58 15 346 1.2 220 425 0.21 NM <0.5 <5 138 665 0.086 NA NA <5 NA <50 186 NA NA 199 NA CW-2 04/10/2013 5.3 12.75 16 269 2.53 202 407 0.59 NM <1 <1 115 522 <1 NA NA <5 NA <10 140 NA NA 150 NA CW-2 DUP 04/10/2013 5.3 12.75 16 269 2.53 202 407 0.59 NM <1 <1 113 513 <1 NA NA <5 NA <10 138 NA NA 150 NA CW-2 07/09/2013 5.2 13.62 21 300 0.91 104 309 3.21 NM <1 <1 124 696 <1 NA NA <5 NA 51 360 NA NA 190 NA CW-2 11/13/2013 5.3 14.40 12 367 1.7 234 439 6.8 NM <1 <1 157 785 <1 NA NA <5 NA 77 535 NA NA 220 NA CW-2 04/01/2014 5.3 12.80 12 241 3.7 241 446 0.9 NM <1 <1 106 517 <1 NA NA <5 NA 12 135 NA NA 150 NA CW-2 DUP 04/01/2014 5.3 12.80 12 241 3.7 241 446 0.9 NM <1 <1 102 498 <1 NA NA <5 NA 16 131 NA NA ISO NA CW-2 07/16/2014 5.0 14.59 16 291 1.4 298 503 1.37 NM <1 <1 116 700 <1 NA NA <5 NA 44 260 NA NA 210 NA CW-2 11/12/2014 5.0 14.30 16 396 1.05 275 480 0.83 NM <1 <1 178 878 <1 NA NA <5 NA 17 1020 NA NA 230 NA CW-2 DUP 11/12/2014 5.0 14.30 16 396 1.05 275 480 0.83 NM <1 <1 176 863 <1 NA NA <5 NA <10 1000 NA NA 240 NA CW-2 04/14/2015 5.0 12.36 13 215 1.9 323 528 1.09 NM <1 <1 97 524 <1 NA NA <5 <1 17 170 12.9 NA 140 NA CW-2 07/07/2015 5.1 13.33 16 286 0.8 214 419 0.96 NM <1 <1 129 804 <1 NA 0.1 <5 <1 <10 393 17.3 NA 210 <0.3 CW-2 09/08/2015 5.3 14.77 18 326 1.8 182 387 1.81 1.5 <1 <1 130 848 <1 NA NA <1 <1 11 465 20.4 291 250 0.358 P:\Duke Energy Progress. 1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 4-5 Transition Zone Exceedances Incorporating Provisional Background.xlsx Page 1 of 2 TABLE 4-5 TRANSITION ZONE GROUNDWATER EXCEEDANCES INCORPORATING PROVISIONAL BACKGROUND MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter pH ater ILevel Temp Spec Coed DO ORP Eh Turbidity Ferrous Iron Antimony Arsenic Barium Boron Cadmium Chromium (VI) Chromium (VI) Speciation Chromium Cobalt Iron Manganese Sodium Strontium Total Dissolved Solids Vanadium Reporting Units S.U. ft Deg C umhos/cm mg/l mV mV NTUs mg/l ug/l ug/1 ug/l ug/l ug/l ug/1 ug/l ug/l ug/l ug/l ug/1 mg/1 ug/1 mg/I ug/l ISA NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE 1* 10 700 700 2 0.07A 0.07A 10 1* 300 50 NE NE Soo 0.3* Provisional Background 5.9-8.5 NE NE NE NE NE NE NE NE 1.573 NE 70.4 NE NE 1.066 1.066 26.56 1.37 1727 729.4 56 391 444 22.59 Sample ID Sample Collection Date Field Parameters Analytical Results CW-2 11/04/2015 5.2 13.04 15 337 2.22 250 455 0.55 NM <1 <1 163 770 <1 NA NA 6 <1 22 298 18.3 290 210 <0.3 CW-2 DUP 11/04/2015 5.2 13.04 15 337 2.22 250 455 0.55 NM <1 <1 162 765 <1 NA NA <5 <1 19 298 18.2 289 200 <0.3 CW-2 12/02/2015 5.0 12.21 15 284 2.13 179 384 2.77 1.5 <1 <1 143 665 <1 0.12 NA <1 <1 162 294 16.2 250 170 0.326 CW-2 01/06/2016 5.1 12.39 13 210 2.62 189 394 0.58 0 <1 <1 99 539 <1 0.087 NA <1 <1 11 173 12.9 177 130 <0.3 CW-2 04/04/2016 5.3 12.87 16 218 1.77 265 470 0.48 0 <1 <1 102 562 <1 NA NA <5 <1 <10 127 12.9 178 140 <0.3 CW-3 12/02/2010 6.7 16.09 14 761 NM NM NM 9.9 NM <0.5 <5 47.9 <50 <0.08 NA NA <5 NA 908 481 NA NA 438 NA CW-3 04/21/2011 6.4 15.24 14 738 2.1 -77 129 5.73 NM <0.5 <5 27.7 <50 <0.08 NA NA <5 NA 128 305 NA NA 463 NA CW-3 07/12/2011 6.3 15.53 22 765 0.71 -118 87 4.32 NM <0.5 <5 24.5 B <50 <0.08 NA NA <5 NA 99.7 201 NA NA 474 NA CW-3 04/04/2012 6.5 15.85 16 617 3.13 -75 130 5.56 NM <0.5 <5 25.5 <50 <0.08 NA NA <5 NA 117 254 NA NA 456 NA CW-3 DUP 04/04/2012 6.5 15.85 16 617 3.13 -75 130 5.56 NM <0.5 <5 26 <50 <0.08 NA NA <5 NA 115 258 NA NA 452 NA CW-3 07/09/2012 6.3 16.98 20 736 1.59 -52 153 4.61 NM <0.5 <5 22.2 <50 <0.08 NA NA <5 NA 92.2 120 NA NA 487 NA CW-3 04/10/2013 6.4 17.49 19 763 2.56 NM NM 2.65 NM <1 <1 26 <50 <1 NA NA <5 NA 57 153 NA NA 520 NA CW-3 07/09/2013 6.3 16.42 20 735 1.28 -629 -424 4.88 NM <1 <1 21 <50 <1 NA NA <5 NA 95 61 NA NA 510 NA CW-3 04/01/2014 6.5 16.30 16 707 3.6 216 421 1.3 NM <1 <1 24 <50 <1 NA NA <5 NA 21 100 NA NA 470 NA CW-3 07/06/2015 6.5 15.93 21 645 1 46 251 2.78 NM <1 <1 19 <50 <1 NA NA <5 <1 71 <5 44.5 NA 440 1.41 CW-3 09/08/2015 6.4 17.12 22 648 0.8 57 262 1.6 0 <1 <1 15 <50 <1 NA NA <1 <1 11 <5 43.5 338 430 1.52 CW-3 11/03/2015 6.5 17.54 18 628 0.9 65 270 0.53 NM <1 <1 15 <50 <1 NA NA <5 <1 14 <5 44.5 B2 335 400 1.48 CW-3 04/05/2016 6.5 15.10 12 612 2.83 170 375 0.37 NM <1 <1 18 <50 <1 NA NA <5 <1 <10 34 42.1 321 390 1.23 CW-4 12/02/2010 6.4 22.53 13 195 NM NM NM 21 NM <0.5 <5 29.6 <50 <0.08 NA NA <5 NA 784 16.1 NA NA 150 NA CW-4 07/06/2015 5.9 21.64 18 162 3 105 310 2.76 NM <1 <1 25 <50 <1 NA NA <5 <1 87 <5 15.5 NA 160 1.02 CW-4 09/09/2015 5.9 22.33 19 190 1.5 136 341 1.63 NM <1 <1 26 <50 <1 NA NA <1 <1 30 <5 15.7 138 140 1.07 CW-4 11/03/2015 6.0 22.48 16 178 2.2 155 360 2.76 NM <1 <1 27 <50 <1 NA NA <5 <1 151 5 16.6 B2 138 140 1.28 CW-4 04/05/2016 6.1 21.15 11 175 1.9 172 377 3.3 NM <1 <1 23 <50 <1 NA NA <5 <1 58 7 15.6 116 140 0.888 MW-7D 06/19/2015 6.4 9.30 24 668 2.37 -8 197 12.1 0 <1 <1 24 <50 <1 NA NA <1 <1 69 188 30.7 442 390 0.798 MW-7D 09/11/2015 6.3 12.33 19 1171 0.6 102 307 4.96 0 <1 <1 24 <50 <1 NA NA <1 <1 161 166 2.79 418 370 0.843 MW-7D 12/02/2015 6.3 11.19 15 622 0.35 43 248 5.6 0 <1 <1 21 <50 <1 <0.03 NA <1 <1 348 93 33.4 448 370 0.779 MW-7D 01/06/2016 6.8 9.86 12 553 0.78 70 275 3.88 0 <1 <1 19 <50 <1 <0.03 NA <1 <1 154 69 32.3 417 340 0.757 MW-16D 06/23/2015 7.1 3.51 19 221 2.49 55 260 9.38 0 <1 <1 13 <50 <1 NA 0.051 <1 <1 87 269 9.77 163 160 0.617 MW-16D DUP 06/23/2015 7.1 3.51 19 221 2.49 55 260 9.38 0 <1 <1 13 <50 <1 NA 0.061 <1 <1 85 261 9.72 163 150 0.729 MW-16D 09/09/2015 6.6 4.04 20 234 1.5 79 284 7.27 0 <1 <1 10 <50 <1 NA 0.066 <1 <1 79 141 9.69 166 150 0.676 MW-16D DUP 09/09/2015 6.6 4.04 20 234 1.5 79 284 7.27 0 <1 <1 10 <50 <1 NA 0.069 <1 <1 90 143 9.66 166 150 0.772 MW-16D 12/04/2015 7.1 3.26 14 222 1.99 80 285 8.47 0 <0.5 <0.5 9.7 <50 <0.08 0.097 NA 0.9 <0.5 610 63 9.84 170 188 <1 MW-16D DUP 12/04/2015 7.1 3.26 14 222 1.99 80 285 8.47 0 <0.5 <0.5 12 <50 <0.08 0.095 NA 1.1 <0.5 900 82 9.69 170 202 <1 MW-16D 01/07/2016 7.1 3.04 13 269 2.1 157 362 4.8 0 <1 <1 7 <50 <1 0.097 NA <1 <1 203 28 9.62 161 130 0.678 MW-16D DUP 01/07/2016 7.1 3.04 13 269 2.1 157 1 362 1 4.8 0 <1 <1 7 <50 <1 0.1 NA <1 <1 200 27 9.56 159 140 0.598 Notes: - Concentration greater than 2L/IMAC or Provisional Background Concentration ug/I = microgram per liter Deg C = Degree Celsius mg/I = milligrams per liter DUP = Duplicate umhos/cm = micro mhos per centimeter DO = Dissolved Oxygen NTU = Nephelometric Turbidity Unit ORP = Oxidation Reduction Potential S.U. = Standard Unit mV = millivolts Spec Cond = Specific Conductance Eh = Redox Potential B = data flagged due to a detection in the field blank = NC DHHS Health Screening Level. Values indicated in red associated with sample turbidity greater than 10 NTU. * - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April, 1, 2013. < = concentration not detected at or above reporting limit Temp = Temperature ft = feet NM = Not Measured NA = Not Analyzed NE = Not Established Prepared by: BER Checked by: JAW P:\Duke Energy Progress. 1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 4-5 Transition Zone Exceedances Incorporating Provisional Background.xlsx Page 2 of 2 TABLE 4-6 BEDROCK GROUNDWATER EXCEEDANCES INCORPORATING PROVISIONAL BACKGROUND MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter pH Water Level Temp Spec Cond DO ORP Eh Turbidity Ferrous Iron Antimony Barium Chromium (VI) Chromium (VI) Speciation Chromium Cobalt Iron Lead Manganese Selenium Sodium Strontium Thallium Total Dissolved Solids Vanadium Reporting Units S.U. ft Deg C umh s mg/I mV mV NTUs mg/l ug/I ug/l ug/I ug/I ug/I ug/l ug/I ug/I ug/I ug/I mg/1 ug/I ug/I mg/1 ug/I 15A NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE 1* 700 0.07^ 0.07^ 10 1* 300 15 50 20 NE NE 0.2* 500 0.3* Provisional Background 5.1-10.3 1 NE I NE I NE I NE I NE NE I NE NE 5.089 1 101.2 1 62.35 62.35 66.79 1 4.244 1 4663 1 0.13 630.9 NE 68.57 427 0.334 360.5 34.19 Sample ID Sample Collection Date Field Parameters Analytical Results Background BG-1 10/31/2008 5.7 35.99 16 141 NM NM NM NM NM 0.13 1040 NA NA 36.9 NA 65700 33.1 2270 2.4 NA NA 0.35 189 NA BG-1 06/04/2009 6.9 34.44 18 161 NM NM NM NM NM 2.5 155 NA NA 4.7 NA 2100 12.9 131 <5 NA NA <1 167 NA BG-1 10/21/2009 5.3 36.55 16 102 NM NM NM NM NM 4.2 175 NA NA 15.7 NA 4610 2.3 166 <5 NA NA <1 146 NA BG-1 04/22/2010 5.6 33.59 15 107 NM NM NM NM NM <10 120 NA NA 8.2 NA 2000 12 39 <10 NA NA <50 17 NA BG-1 12/06/2010 5.9 36.64 16 186 NM NM NM 10 NM <0.5 105 NA NA 15.3 NA 1080 <5 26.3 <10 NA NA <0.1 126 NA BG-1 04/20/2011 5.5 35.36 20 158 1.16 1 50 255 1 22.7 NM <0.5 99.1 NA NA 6.1 NA 702 1 <5 26.6 <10 NA NA <0.1 135 NA BG-1 07/11/2011 5.5 35.57 24 163 0.99 -71 134 24.2 NM <0.5 101 B NA NA 40.1 NA 1040 <5 1 <10 NA NA <0.1 117 B NA BG-1 11/03/2011 5.5 37.18 18 165 1.27 -103 102 3.84 NM <0.5 95.4 NA NA 7.9 NA 261 <5 8.9 <10 NA NA <0.1 106 NA BG-1 04/04/2012 5.6 36.01 21 168 0.93 -91 114 9.52 NM <0.5 93 NA NA 6.7 NA 388 <5 11.6 <10 NA NA <0.1 107 NA BG-1 07/09/2012 5.3 36.69 19 166 1.05 -64 141 9.32 NM <0.5 101 NA NA 20 NA 640 <5 21.6 <10 NA NA <0.1 128 NA BG-1 11/05/2012 5.4 37.45 17 166 0.89 178 383 9.45 NM <0.5 101 NA NA <5 NA 526 <5 55.6 <10 NA NA <0.1 123 NA BG-1 04/10/2013 5.2 35.25 17 165 0.79 1 213 418 9.05 NM <1 97 NA NA 7 NA 323 <1 15 <1 NA NA <0.2 130 NA BG-1 07/09/2013 5.4 34.17 19 160 1.02 152 357 8.95 NM <1 97 NA NA <5 NA 488 <1 48 <1 NA NA <0.2 130 NA BG-1 11/13/2013 5.5 34.42 15 160 1.3 256 461 8.2 NM <1 95 NA NA <5 NA 412 <1 27 <1 NA NA <0.2 130 NA BG-1 04/01/2014 5.4 32.85 15 159 1.2 340 545 8.2 NM <1 90 NA NA <5 NA 290 <1 14 <1 NA NA <0.2 140 NA BG-1 07/18/2014 5.5 32.12 19 158 1.4 232 437 6.68 NM <1 93 NA NA <5 NA 325 <1 15 <1 NA NA <0.2 140 NA BG-1 11/12/2014 5.5 31.90 18 167 1.64 255 460 9.96 NM <1 95 NA NA <5 NA 466 <1 25 <1 NA NA <0.2 120 NA BG-1 04/13/2015 5.5 30.16 17 154 1.2 296 501 8.9 NM <1 90 NA NA <5 <1 409 <1 35 <1 12.4 NA <0.2 130 NA BG-1 07/07/2015 5.6 29.86 18 151 1.6 113 318 10 NM <1 97 NA NA <5 <1 557 <1 23 <1 11.8 NA <0.2 130 4.94 BG-1 09/10/2015 5.3 30.43 19 168 1.5 190 395 7.83 0 <1 91 NA NA <1 <1 300 <1 26 <1 11.6 172 <0.2 120 3.93 BG-1 11/03/2015 6.9 30.00 20 14 9.3 7 212 1.79 NM <1 90 NA NA <5 <1 45 <1 7 <1 11.8 B2 179 <0.2 110 3.4 BG-1 12/05/2015 5.5 30.34 16 150 1.55 128 333 9.5 0 <0.5 94 0.31 NA 1 <0.5 350 0.13 18 <0.5 12.2 180 <0.1 118 4.2 BG-1 01/08/2016 5.1 29.36 15 147 1.48 67 272 5.78 0 <1 87 0.2 NA <1 <1 272 <1 11 <1 11.9 166 <0.2 130 3.94 BG-1 04/04/2016 5.5 28.46 17 149 1.58 206 411 4.3 0 <1 88 0.19 M1 NA <5 <1 190 <1 12 <1 11.5 167 <0.2 130 3.94 MW-10BR 03/17/2015 6.2 13.19 22 467 0.55 99 304 35.5 0.5 <1 27 NA NA 1.3 <1 883 <1 894 <1 37.9 210 <0.2 330 1.66 MW-10BR 09/11/2015 6.1 13.36 25 452 0.5 14 219 1.06 0 <1 5 NA NA <1 <1 37 <1 135 <1 39.7 198 <0.2 310 1.73 MW-10BR 12/03/2015 6.1 13.30 16 424 0.4 19 224 1.5 0.5 <1 <5 <0.03 NA <1 <1 193 <1 84 <1 37.7 198 <0.2 320 1.5 MW-10BR 01/07/2016 6.1 13.08 13 449 0.53 50 255 1.64 0 <1 <5 <0.03 NA <1 <1 33 <1 103 <1 39.5 195 <0.2 300 1.68 MW-10BR 04/05/2016 6.2 12.70 13 443 0.43 141 346 0.98 NM <1 <5 <0.03 NA <1 <1 29 <1 71 <1 38.8 195 <0.2 300 1.7 MW-11BR 06/25/2015 8.1 40.25 19 382 2.79 28 233 3.91 0 1.32 44 NA NA 1.73 <1 115 <1 67 <1 14.3 200 0.323 250 2.69 MW-11BR 09/11/2015 9.2 36.86 21 282 1.1 33 238 7.87 0 1.74 32 NA NA 15.6 <1 153 <1 11 1.16 15.6 318 <0.2 180 9.15 MW-11BR 12/03/2015 9.2 36.70 14 230 1.8 -10 195 8.7 0 1.57 22 13.6 NA 24.1 <1 304 <1 29 1.04 20.7 250 <0.2 150 12.1 MW-11BR 01/07/2016 9.8 36.18 14 214 1.2 -40 165 5.04 0 1.9 24 12.2 NA 15.1 <1 98 <1 17 <1 16.6 253 <0.2 130 12.7 MW-11BR 04/05/2016 10.3 35.21 15 208 1.28 154 359 6.43 NM 1.6 25 18.4 NA 17.2 <1 178 <1 25 <1 16.5 256 <0.2 140 14.5 MW-13BR 06/23/2015 7.2 31.28 21 580 0.4 -228 -23 2.22 1 <1 40 NA 0.005 <1 1.19 1130 <1 474 <1 25.7 418 <0.2 370 0.381 MW-13BR 09/08/2015 6.9 31.63 23 579 0.5 -136 69 7.55 2 <1 51 NA NA <1 <1 2400 <1 630 <1 24.8 430 0.538 360 0.465 MW-13BR 12/02/2015 7.0 31.55 16 543 0.3 -130 75 6.5 2.5 <1 45 <0.03 NA 16.3 <1 2490 <1 548 <1 23.3 416 <0.2 330 0.429 MW-13BR 01/07/2016 7.3 30.36 11 544 0.5 -75 130 7.79 1.5 <1 42 <0.03 NA 7.65 <1 2550 <1 519 <1 23.7 389 <0.2 330 <0.3 MW-13BR 04/05/2016 7.1 29.70 15 566 0.3 151 356 9.05 NM <1 35 <0.03 NA <1 1.01 1750 <1 481 <1 20.8 393 <0.2 340 <0.3 MW-14BR 03/12/2015 6.7 16.20 14 278 0.47 41 224 35 0.5 <1 30 NA NA <1 1.41 907 <1 544 <1 33 149 <0.2 190 1.29 MW-14BR 09/09/2015 6.9 18.03 22 413 1.1 -16 189 3.36 1.5 <1 42 NA NA <1 1.09 2730 <1 648 <1 60.2 167 <0.2 260 0.469 MW-14BR 12/02/2015 6.7 16.54 15 282 0.57 26 231 2.77 0 <1 22 <0.03 NA <1 <1 396 <1 304 <1 41.6 141 <0.2 210 1.82 MW-14BR 01/07/2016 6.7 16.31 11 258 2.73 64 269 2.45 0 <1 17 <0.03 NA <1 <1 98 <1 199 <1 37.4 131 <0.2 180 2.45 MW-14BR 04/05/2016 6.7 16.27 14 261 2.13 220 425 2.45 NM <1 19 <0.03 NA <1 <1 89 <1 196 <1 38.4 134 <0.2 200 2.86 P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment P1an\19.EG_CSASUP\Tab1es\Tab1e 4-6 Bedrock Exceedances Incorporating Provsional Background.xlsx Page 1 of 4 TABLE 4-6 BEDROCK GROUNDWATER EXCEEDANCES INCORPORATING PROVISIONAL BACKGROUND MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter pH Water Level Temp Spec Cond DO ORP Eh Turbidity Ferrous Iron Antimony Barium Chromium (VI) Chromium (VI) Speciation Chromium Cobalt Iron Lead Manganese Selenium Sodium Strontium Thallium Total Dissolved Solids Vanadium Reporting Units S.U. ft Deg C umh s mg/I mV mV NTUs mg/l ug/I ug/l ug/I ug/I ug/I ug/l ug/I ug/I ug/I ug/I mg/1 ug/I ug/I mg/1 ug/I 15A NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE 1* 700 0.07^ 0.07^ 10 1* 300 15 50 20 NE NE 0.2* 500 0.3* Provisional Background 5.1-10.3 1 NE I NE I NE I NE I NE I NE I NE NE 5.089 1 101.2 1 62.35 62.35 66.79 1 4.244 4663 1 0.13 630.9 NE 68.57 427 0.334 360.5 34.19 Sample ID Sample Collection Date Field Parameters Analytical Results Bedrock ABMW-2BR 06/17/2015 7.2 11.32 31 631 0.7 -57 148 3.28 0 <1 159 NA NA <1 <1 107 <1 149 <1 26 1270 <0.2 370 0.873 ABMW-2BR 09/10/2015 7.3 11.63 24 603 1.1 -109 96 7.34 0 <1 129 NA NA <1 <1 804 <1 189 <1 31.7 1030 <0.2 350 <0.3 ABMW-2BR 12/01/2015 7.2 11.02 13 593 1.16 -47 158 0.88 0.3 <1 122 <0.03 M1 NA <1 <1 672 <1 198 <1 29.7 1060 0.21 170 <0.3 ABMW-2BR 01/05/2016 7.4 10.86 3 543 1.34 -126 79 3.53 2 <1 123 <0.03 NA <1 <1 1100 <1 237 <1 29.3 1090 <0.2 350 0.315 ABMW-2BRL 02/02/2016 6.9 11.48 17 506 2.47 136 341 2.36 0 <1 58 0.052 NA <1 <1 106 <1 161 <1 17.5 2260 <0.2 310 0.45 ABMW-2BRL 04/05/2016 7.3 11.88 16 517 0.27 1 -173 32 1 0.77 NM <1 59 <0.03 NA <1 <1 896 1 <1 219 <1 16.7 2220 <0.2 320 <0.3 ABMW-4BR 06/23/2015 7.4 6.00 26 556 0.5 -244 -39 5.03 0.5 <1 115 NA 0.005 <1 <1 1590 <1 407 <1 21.2 2020 <0.2 370 0.382 ABMW-4BR 09/09/2015 7.5 7.89 26 523 0.8 -212 -7 4.5 0.5 <1 106 NA NA <1 <1 360 <1 350 <1 20.9 1820 <0.2 320 0.458 ABMW-4BR 12/01/2015 7.6 6.25 17 398 0.19 -278 -73 2.49 0 <1 102 0.043 NA <1 <1 318 <1 330 <1 20.9 1730 <0.2 640 0.594 ABMW-4BR 01/05/2016 7.6 5.43 7 531 2.93 -240 -35 1.36 0 <1 110 <0.03 NA <1 <1 295 <1 364 <1 21.7 1780 <0.2 300 0.438 CW-1D 12/02/2010 7.5 18.64 17 390 NM NM NM 9.3 NM <0.5 11.1 NA NA 11 NA 207 <5 422 <10 NA NA <0.1 218 NA CW-1D 11/06/2012 7.0 20.31 13 384 1.07 149 354 2.15 NM <0.5 <5 NA NA <5 NA <50 <5 52.6 <10 NA NA <0.1 203 NA CW-1D 07/08/2015 6.8 19.01 21 348 0.6 132 337 4.2 NM <1 <5 NA NA <5 <1 <10 <1 <5 <1 12.8 NA <0.2 200 1.09 CW-11) 09/11/2015 6.9 20.28 20 341 0.5 108 313 1.07 0 <1 <5 NA NA <1 <1 <10 <1 <5 <1 12.7 166 <0.2 210 1.25 CW-1D 11/04/2015 7.0 19.05 18 338 1.99 100 305 1.13 NM <1 6 NA NA 12 <1 17 <1 13 <1 12.6 173 <0.2 180 1.12 CW-11) 04/04/2016 7.0 18.44 19 356 11.7 178 383 5.89 0 <1 <5 NA NA <5 <1 40 <1 13 <1 12.3 167 <0.2 220 1.1 CW-2D 12/02/2010 6.7 14.39 13 300 NM NM NM 20 NM <0.5 34.2 NA NA <5 NA 370 <5 102 <10 NA NA <0.1 205 NA CW-2D 04/20/2011 6.5 13.60 17 419 4.19 -35 170 13.6 NM <0.5 33.4 NA NA <5 NA 227 <5 156 <10 NA NA <0.1 208 NA CW-2D 07/12/2011 6.7 15.26 19 427 1.31 -139 66 23.8 NM <0.5 32.3 B NA NA <5 NA 522 <5 254 <10 NA NA <0.1 207 B NA CW-2D DUP 07/12/2011 6.7 15.26 19 427 1.31 -139 66 23.8 NM <0.5 30.8 B NA NA <5 NA 498 <5 258 <10 NA NA <0.1 216 B NA CW-2D 11/03/2011 6.5 14.68 14 365 0.85 -71 134 16.7 NM <0.5 31.6 NA NA <5 NA 286 <5 250 <10 NA NA <0.1 197 NA CW-21) 04/05/2012 6.5 14.14 14 329 2.53 -51 154 17.4 NM <0.5 27.4 NA NA <5 NA 347 <5 270 <10 NA NA <0.1 221 NA CW-2D 07/10/2012 6.5 15.61 20 381 1.2 -54 151 15.2 NM <0.5 24 NA NA <5 NA 392 <5 231 <10 NA NA <0.1 260 NA CW-21) 07/09/2013 6.8 14.07 22 440 1.33 98 303 5.32 NM <1 30 NA NA <5 NA 256 <1 107 <1 NA NA <0.2 260 NA CW-2D 11/13/2013 6.5 14.88 10 402 1.4 181 386 6.5 NM <1 32 NA NA <5 NA 125 <1 89 <1 NA NA <0.2 260 NA CW-2D 04/01/2014 6.3 13.30 15 396 2.4 180 385 6.7 NM <1 41 NA NA <5 NA 105 <1 169 <1 NA NA <0.2 230 NA CW-2D 07/16/2014 6.3 15.10 17 360 3.03 199 404 7.31 NM <1 36 NA NA <5 NA 124 <1 102 <1 NA NA <0.2 250 NA CW-2D 11/12/2014 6.4 14.78 16 382 2.14 173 378 6.46 NM <1 35 NA NA <5 NA 136 <1 95 <1 NA NA <0.2 230 NA CW-21) 04/14/2015 6.2 12.71 16 360 3.8 342 547 4.98 NM <1 42 NA NA <5 <1 149 <1 123 <1 17.4 NA <0.2 240 NA CW-21) 07/07/2015 6.1 13.76 18 359 2.9 162 367 9.8 NM <1 38 NA 0.084 <5 <1 278 <1 81 <1 17.6 NA <0.2 250 0.585 CW-2D 09/08/2015 6.4 13.30 18 375 1.6 172 377 9.12 0 <1 39 NA NA <1 <1 267 <1 79 <1 18.3 286 <0.2 270 0.689 CW-21) 11/04/2015 6.3 13.50 15 370 1.31 120 325 4.31 NM <1 44 NA NA 8 <1 172 <1 68 <1 18.5 258 <0.2 210 0.551 CW-2D 12/02/2015 7.1 12.62 15 540 0.32 143 348 4.73 0 <1 42 0.061 NA <1 <1 231 <1 117 <1 19.3 293 <0.2 200 0.478 CW-2D 01/06/2016 5.8 12.79 12 327 0.61 160 365 7.41 0 <1 51 0.089 NA <1 <1 332 <1 148 <1 23.1 255 <0.2 220 0.594 CW-2D 04/04/2016 6.2 13.27 22 343 2.67 159 364 7.45 0 <1 48 NA NA <5 <1 191 <1 92 <1 19 263 <0.2 240 0.377 CW-5 12/06/2010 6.9 10.69 12 397 NM NM NM 5.8 NM <0.5 55.3 NA NA <5 NA 293 <5 609 <10 NA NA <0.1 243 NA CW-5 04/21/2011 6.6 5.83 14 383 0.29 -84 121 6.23 NM <0.5 49.2 NA NA <5 NA 343 <5 583 <10 I NA NA <0.1 242 NA CW-5 07/12/2011 6.6 9.61 22 377 2.55 -95 110 0.45 NM <0.5 54.1 B NA NA <5 NA 485 <5 629 <10 NA NA <0.1 253 B NA CW-5 11/04/2011 6.6 13.66 16 390 0.8 -129 76 2 NM <0.5 54.1 NA NA <5 NA 546 <5 600 <10 NA NA <0.1 <25 NA CW-5 04/05/2012 6.5 7.02 15 365 2.7 -83 122 3.13 NM <0.5 44.5 NA NA <5 NA 98.9 <5 387 <10 NA NA <0.1 230 NA CW-5 07/10/2012 6.6 12.02 20 376 0.75 -75 130 4.03 NM <0.5 47.5 NA NA <5 NA 597 <5 622 <10 NA NA <0.1 250 NA CW-5 11/06/2012 6.6 12.83 14 373 1.16 7 212 0.69 NM <0.5 52.6 NA NA <5 NA 588 <5 557 <10 NA NA <0.1 241 NA CW-5 04/10/2013 6.6 6.22 19 393 2.12 NM NM 5.54 NM <1 47 NA NA <5 NA 274 <1 549 <1 NA NA <0.2 250 NA CW-5 07/09/2013 6.4 6.96 25 375 0.59 535 1 -330 1.68 NM <1 50 NA NA <5 NA 589 <1 595 <1 NA NA 0.361 240 NA P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment P1an\19.EG_CSASUP\Tab1es\Tab1e 4-6 Bedrock Exceedances Incorporating Provsional Background.xlsx Page 2 of 4 TABLE 4-6 BEDROCK GROUNDWATER EXCEEDANCES INCORPORATING PROVISIONAL BACKGROUND MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter pH Water Level Temp Spec Cond DO ORP Eh Turbidity Ferrous Iron Antimony Barium Chromium (VI) Chromium (VI) Speciation Chromium Cobalt Iron Lead Manganese Selenium Sodium Strontium Thallium Total Dissolved Solids Vanadium Reporting Units S.U. ft Deg C umh s mg/I mV mV NTUs mg/l ug/I ug/l ug/I ug/I ug/I ug/l ug/I ug/I ug/I ug/I mg/1 ug/I ug/I mg/1 ug/I 15A NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE 1* 700 0.07^ 0.07^ 10 1* 300 15 50 20 NE NE 0.2* 500 0.3* Provisional Background 5.1-10.3 NE NE NE NE I NE NE NE NE 5.089 1 101.2 1 62.35 62.35 66.79 1 4.244 4663 1 0.13 630.9 NE 68.57 427 0.334 360.5 34.19 Sample ID Sample Collection Date Field Parameters Analytical Results CW-5 11/13/2013 6.8 13.46 13 416 0.5 18 223 3.5 NM <1 53 NA NA <5 NA 936 <1 706 <1 NA NA <0.2 250 NA CW-5 04/01/2014 6.8 5.53 16 429 1.9 138 343 7.3 NM <1 51 NA NA <5 NA 799 <1 650 <1 NA NA <0.2 280 NA CW-5 07/17/2014 6.5 9.32 17 395 0.41 21 226 8.63 NM <1 57 NA NA <5 NA 1080 <1 672 <1 NA NA <0.2 270 NA CW-5 11/13/2014 6.6 9.75 14 429 0.37 72 277 6.1 NM <1 58 NA NA <5 NA 988 <1 660 <1 NA NA <0.2 260 NA CW-5 04/14/2015 6.6 3.95 15 415 0.8 61 266 7.62 NM <1 54 NA NA <5 1 731 <1 696 <1 18.2 NA <0.2 270 NA CW-5 07/06/2015 6.7 6.38 22 434 0.3 1 -110 96 1 8.68 NM <1 57 NA NA <5 1 <1 1060 1 <1 785 <1 18 NA <0.2 290 <0.3 CW-5 09/09/2015 6.7 10.52 29 446 1.3 -1 204 6.24 0.5 <1 54 NA NA <1 <1 780 <1 868 <1 17.3 161 <0.2 280 <0.3 CW-5 11/03/2015 6.7 9.64 17 407 0.4 -31 175 5.79 NM <1 54 NA NA <5 <1 906 <1 694 <1 18.3 B2 156 <0.2 250 <0.3 CW-5 04/05/2016 7.0 4.97 12 417 3.04 199 404 6.52 0.25 <1 47 NA NA <5 <1 513 <1 380 <1 18.2 161 <0.2 270 <0.3 CW-6 12/01/2010 7.1 14.33 14 778 NM NM NM 10.9 NM <0.5 34.1 NA NA 7.1 NA 1220 <5 1090 <10 18 NA <0.1 445 NA CW-6 04/20/2011 6.6 13.21 16 762 0.44 -81 124 4.31 NM <0.5 34.3 NA NA <5 NA 1260 <5 1160 <10 17.3 NA <0.1 481 NA CW-6 07/12/2011 6.6 13.78 18 794 0.63 -126 79 1 6.53 NM <0.5 35.4 B NA NA <5 NA 1330 <5 1160 <10 18.3 B2 NA <0.1 417 NA CW-6 11/04/2011 6.8 15.31 14 753 0.87 -157 48 2.17 NM <0.5 35.5 NA NA <5 NA 1780 <5 1310 <10 18.4 NA <0.1 464 NA CW-6 04/05/2012 6.5 14.04 14 674 0.87 -96 109 1.37 NM <0.5 36.1 NA NA <5 NA 1520 <5 1270 <10 NA NA <0.1 486 NA CW-6 07/10/2012 6.7 15.04 18 870 0.74 -99 106 2.81 NM <0.5 34.4 NA NA <5 NA 1440 <5 1260 <10 NA NA <0.1 524 NA CW-6 DUP 07/10/2012 6.7 15.04 18 870 0.74 -99 106 2.81 NM <0.5 34.5 NA NA <5 NA 1480 <5 1410 <10 NA NA <0.1 531 NA CW-6 11/05/2012 6.8 16.51 14 823 0.94 -70 135 2.76 NM <0.5 36.6 NA NA <5 NA 1780 <5 1280 <10 NA NA <0.1 528 NA CW-6 04/10/2013 6.6 14.02 19 927 0.36 -103 102 1.57 NM <1 38 NA NA <5 NA 1720 <1 1440 <1 NA NA <0.2 550 NA CW-6 07/09/2013 6.6 13.34 19 882 0.44 -110 95 0.99 NM <1 40 NA NA <5 NA 1580 <1 1400 <1 NA NA <0.2 550 NA CW-6 DUP 07/09/2013 6.6 13.34 19 882 0.44 -110 95 0.99 NM <1 40 NA NA <5 NA 1540 <1 1380 <1 NA NA <0.2 550 NA CW-6 11/13/2013 6.8 14.98 13 857 0.5 -46 159 7 NM <1 40 NA NA <5 NA 1870 <1 1390 <1 NA NA <0.2 520 NA CW-6 DUP 11/13/2013 6.8 14.98 13 857 0.5 -46 159 7 NM <1 40 NA NA <5 NA 1740 <1 1360 <1 NA NA <0.2 520 NA CW-6 04/01/2014 6.6 12.35 16 862 0.4 13 218 2.3 NM <1 39 NA NA <5 NA 1330 <1 1300 <1 NA NA <0.2 550 NA CW-6 07/16/2014 6.6 13.69 16 827 0.49 -18 187 5.22 NM <1 41 NA NA <5 NA 1390 <1 1350 <1 NA NA <0.2 550 NA CW-6 DUP 07/16/2014 6.6 13.69 16 827 0.49 -18 187 5.22 NM <1 41 NA NA <5 NA 1380 <1 1350 <1 NA NA <0.2 550 NA CW-6 11/12/2014 6.6 14.59 16 802 0.23 -5 200 0.95 NM <1 42 NA NA <5 NA 1410 <1 1380 <1 NA NA <0.2 520 NA CW-6 04/14/2015 6.6 10.54 15 812 0.2 -127 78 6.33 NM <1 42 NA NA <5 <1 1370 <1 1300 1.48 37.6 NA <0.2 540 NA CW-6 07/06/2015 6.7 12.12 17 890 0.4 -188 17 1.72 <0.5 <1 48 NA NA <5 <1 2040 <1 1450 <1 38.9 NA <0.2 560 <0.3 CW-6 DUP 07/06/2015 6.7 12.12 17 890 0.4 -188 17 1.72 NM <1 49 NA NA <5 <1 2060 <1 1470 <1 39.7 NA <0.2 570 <0.3 CW-6 09/09/2015 6.5 13.73 17 865 0.3 -51 154 2.81 2 <1 45 NA NA <1 <1 1890 <1 1460 <1 35.9 328 <0.2 530 0.341 CW-6 11/04/2015 6.7 14.65 16 872 0.32 -91 114 0.75 NM <1 46 NA NA <5 <1 2050 <1 1400 <1 38.1 334 <0.2 520 <0.3 CW-6 01/06/2016 7.1 12.50 13 815 0.47 -26 179 2.48 NM <1 41 <0.03 NA <1 <1 1790 <1 1440 <1 39 329 <0.2 520 <0.3 CW-6 04/04/2016 6.8 10.44 17 881 0.31 -101 104 3.2 1.5 <1 45 NA NA <5 <1 1860 <1 1420 <1 38.4 338 <0.2 540 <0.3 CW-6 DUP 04/04/2016 6.8 10.44 17 881 0.31 -101 104 3.2 1.5 <1 46 NA NA <5 <1 1900 <1 1450 <1 39 344 <0.2 560 <0.3 MW-2 03/19/2015 5.8 26.11 11 339 0.32 183 388 33.9 0.5 <1 55 NA NA <1 2.78 756 <1 833 <1 27.7 184 <0.2 200 1.68 MW-2 09/08/2015 5.8 27.27 23 329 0.3 68 273 9.29 1 <1 79 NA NA <1 4.86 1190 <1 1730 <1 25.7 210 <0.2 210 0.741 MW-2 12/01/2015 5.6 27.06 15 322 0.41 86 291 8.71 1 <1 74 <0.03 NA <1 5.2 1350 <1 1610 <1 24.6 212 <0.2 320 0.747 MW-2 01/06/2016 5.9 26.15 13 270 0.23 122 327 7.56 0.5 <1 59 <0.03 NA <1 3.81 813 <1 1120 <1 26.7 189 <0.2 200 0.678 MW-3BR 03/14/2015 NM NM NM NM NM NM NM NM NM <1 46 NA NA <1 <1 648 <1 731 <1 20.4 417 <0.2 660 0.781 MW-3BR 09/08/2015 6.9 16.96 23 954 0.5 -89 116 3.8 1 <1 48 NA NA <1 <1 729 <1 694 <1 21.8 414 <0.2 780 0.494 MW-3BR 12/02/2015 7.2 16.88 17 883 0.51 -103 102 1.91 NM <1 46 <0.03 NA <1 <1 171 <1 737 <1 24 396 <0.2 590 <0.3 MW-3BR 01/07/2016 7.1 16.30 13 913 0.63 -25 180 0.74 0.5 <1 42 <0.03 NA <1 <1 401 <1 635 <1 21.9 394 <0.2 550 <0.3 MW-4 03/20/2015 6.3 25.98 9 291 5.42 242 447 10.3 0 <1 6 NA NA <1 <1 70 <1 15 <1 17.8 99 <0.2 190 0.891 MW-4 09/09/2015 6.5 28.45 24 319 0.9 54 259 4.11 0 <1 11 NA NA <1 <1 19 <1 7 1 <1 1 17.3 1 102 <0.2 210 0.997 MW-4 12/01/2015 6.3 28.70 11 274 0.93 107 312 1.29 1 <1 7 0.038 NA <1 <1 22 <1 <5 <1 18.4 87 <0.2 210 0.664 P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment P1an\19.EG_CSASUP\Tab1es\Tab1e 4-6 Bedrock Exceedances Incorporating Provsional Background.xlsx Page 3 of 4 TABLE 4-6 BEDROCK GROUNDWATER EXCEEDANCES INCORPORATING PROVISIONAL BACKGROUND MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Analytical Parameter pH Water Level Temp Spec Cond DO ORP Eh Turbidity Ferrous Iron Antimony Barium Chromium (VI) Chromium (VI) Speciation Chromium Cobalt Iron Lead Manganese Selenium Sodium Strontium Thallium Total Dissolved Solids Vanadium Reporting Units S.U. ft Deg C umh s mg/I mV mV NTUs mg/l ug/I ug/l ug/I ug/I ug/I ug/l ug/I ug/I ug/I ug/I mg/1 ug/I ug/I mg/1 ug/I 15A NCAC 02L Standard 6.5-8.5 NE NE NE NE NE NE NE NE 1* 700 0.07^ 0.07^ 10 1* 300 15 50 20 NE NE 0.2* 500 0.3* Provisional Background 5.1-10.3 NE NE NE NE I NE I NE NE NE 5.089 1 101.2 1 62.35 62.35 66.79 1 4.244 4663 1 0.13 630.9 NE 68.57 427 0.334 360.5 34.19 Sample ID Sample Collection Date Field Parameters Analytical Results MW-4 01/06/2016 6.3 26.20 11 283 0.57 92 297 9.25 0 <1 9 0.16 NA 4.21 <1 141 <1 79 <1 18.9 95 <0.2 210 0.803 MW-5BR 03/11/2015 7.1 6.30 14 491 0.29 55 214 4.95 2.5 <1 31 NA NA <1 <1 4240 <1 1740 <1 17.2 209 <0.2 380 <0.3 MW-5BR 09/09/2015 7.2 11.50 27 623 0.6 -116 90 4.54 3 <1 34 NA NA <1 <1 4110 <1 1800 <1 16.5 214 <0.2 410 0.367 MW-5BR 12/02/2015 7.2 9.72 15 602 0.5 -132 73 2.82 7 <1 39 <0.03 NA <1 <1 8230 <1 1860 <1 17.3 219 <0.2 370 <0.3 MW-5BR 01/07/2016 7.2 6.93 12 604 1.84 -98 107 0.92 4 <1 39 <0.03 NA <1 <1 9690 <1 1880 <1 17.9 205 <0.2 360 <0.3 MW-7BR 06/19/2015 7.4 7.42 25 470 0.34 1 -200 5 4.09 <0.5 <1 140 NA NA <1 <1 339 1 <1 263 <1 18.2 988 <0.2 270 <0.3 MW-7BR 09/11/2015 7.3 10.19 20 826 0.3 -157 48 1.33 1 <1 140 NA NA <1 <1 618 <1 227 <1 17 M4 985 <0.2 260 <0.3 MW-7BR 12/02/2015 7.4 9.57 15 441 0.58 -93 112 2.55 0.1 <1 156 <0.03 NA <1 <1 551 <1 224 <1 16.5 1100 <0.2 250 <0.3 MW-7BR 01/06/2016 8.0 8.39 12 402 1.01 -101 104 1.19 0.1 <1 150 <0.03 NA <1 <1 422 <1 210 <1 17.6 1020 <0.2 260 <0.3 MW-8BR 06/18/2015 6.6 34.38 18 858 0.3 -149 56 4.33 2.5 <1 66 NA NA <1 <1 2200 <1 2680 <1 43.8 425 <0.2 550 <0.3 MW-8BR 09/11/2015 6.5 35.36 18 836 0.1 -37 168 9.07 1.5 <1 42 1 NA NA 14.1 1.08 1530 1 1 1390 <1 3.6 1 393 <0.2 540 0.512 MW-8BR 12/02/2015 6.4 35.80 16 706 0.2 29 234 4.6 0.5 <1 39 <0.03 NA <1 <1 468 <1 911 <1 34.1 400 <0.2 500 <0.3 MW-8BR 01/06/2016 6.8 35.98 14 703 0.28 40 245 9.8 0.5 <1 34 <0.03 NA 4.73 <1 417 <1 681 <1 33.4 372 <0.2 480 0.432 MW-9BR 06/18/2015 6.3 24.89 24 226 0.7 2 207 45.6 NM <1 30 NA NA 3.4 <1 3000 <1 809 <1 13.3 109 <0.2 220 4.17 MW-9BR 09/11/2015 6.1 28.92 22 220 1.6 66 271 17.6 0.25 <1 16 NA NA <1 <1 1400 <1 694 <1 17.1 76 <0.2 170 1.94 MW-9BR 12/02/2015 5.8 26.79 15 131 0.33 128 333 62.1 0 <1 9 0.045 NA 3.72 <1 3690 <1 451 <1 12.9 48 <0.2 220 5.41 MW-16BR 06/23/2015 8.7 3.75 25 239 0.89 -191 14 4.66 NM <1 11 NA 0.017 <1 <1 80 <1 30 <1 23.9 112 <0.2 170 2.79 MW-16BR 09/09/2015 8.8 4.32 22 235 0.5 -172 33 1.85 0 1.39 7 NA 0.013 j <1 <1 22 <1 16 <1 28.5 80 <0.2 170 2 MW-16BR 12/04/2015 9.3 3.46 13 228 0.3 -182 23 4.28 0 0.94 6.2 <0.03 NA <0.5 <0.5 58 0.1 17 <0.5 31.8 69 <0.1 209 1.2 MW-16BR 01/07/2016 9.0 3.29 7 232 0.78 -139 66 5.11 0 1.34 9 <0.03 NA <1 <1 126 <1 32 <1 30.3 74 <0.2 150 1.06 NCDEQ Sampled Water Supply Wells MY-3 (Vendor) 03/10/2015 5.7 NM 16 399 9.24 NM NM 29.7 NM <3 70.2 <20 NA <10 <5 1750 21.6 20.9 <10 30.7 436 <1 293 3.03 MY-3 (Duke) 03/10/2015 NM NM NM NM NM NM NM NM NM <1 74 NA NA <5 <1 1680 22.6 23 1.79 34.9 469 <0.2 260 2.44 MY-3 (Vendor) 08/19/2015 5.6 NM 18 261 5.48 NM NM <1 NM <0.5 60.4 0.13 NA 0.6 <0.5 <50 5.9 8 1.3 30.7 391 <0.1 226 <1 MY-5 (Vendor) 05/04/2015 7.1 NM 16 572 1.8 NM NM 1.5 NM <5 54.5 <0.03 NA <5 <5 953 2.7 517 <5 <0.5 621 <1 349 <10 MY-5 (Duke) 05/04/2015 NM NM NM NM NM NM NM NM NM <1 61 NA NA 5 <1 1300 2.76 508 <1 23.7 673 <0.2 340 3.15 MY-7 (Vendor) 09/01/2015 6.1 NM 18 85 7.07 NM NM <1 NM 1 <0.5 30 0.63 NA 0.86 <0.5 <50 1.8 0.78 <0.5 9.66 106 <0.1 88 2.5 MY-7 (Duke) 09/01/2015 NM NM NM NM NM NM NM NM NM <1 32 NA NA <5 <1 <10 1.73 <5 <1 9.42 113 <0.2 110 2.38 Prepared by: BER Checked by: JAW Notes: - Concentration greater than 2L/IMAC or Provisional Background Concentration ug/I = microgram per liter Deg C = Degree Celsius Temp = Temperature mg/I = milligrams per liter DUP = Duplicate ND = Not detected above reporting limit umhos/cm = micro mhos per centimeter DO = Dissolved Oxygen NM = Not Measured NTU = Nephelometric Turbidity Unit ORP = Oxidation Reduction Potential NA = Not Analyzed S.U. = Standard Unit Spec Cond = Specific Conductance NE = Not Established mV = millivolts Eh = Redox Potential ft = feet B = Data flagged due to a detection in the field blank * - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April, 1, 2013. < = concentration not detected at or above reporting limit = NC DHHS Health Screening Level. M1 = Matrix spike recovery was high: the associated Laboratory Control Spike (LCS) was acceptable. j = indicates concentration reported below Practical Quantitation Limit (PQL), but above Method Detection Limit (MDL) and therefore concentration is estimated. Values indicated in red associated with sample turbidity greater than 10 NTU. P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 4-6 Bedrock Exceedances Incorporating Provsional Background.xlsx Page 4 of 4 TABLE 4-7 GROUNDWATER TRANSITION ZONE BACKGROUND RESULTS MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Constituent Units Number of Samples Number of Detected Samples Minimum Detected Concentration Maximum Detected Concentration Mean Statistical Method UPL (12 Future Samples) UPL (18 Future Samples) Antimony ug/L 25 2 1.44 1.63 1.535 95% UPL (NP) 1.573 1.573 Arsenic ug/L 25 0 --- --- --- --- --- --- Barium ug/L 25 25 20 71 51.4 95% UPL (NP) 70.4 70.4 Boron ug/L 25 0 --- --- --- --- --- --- Chromium (VI) ug/L 7 4 0.52 0.64 0.578 95% Approx. Gamma UPL 0.729 1.066 Chromium ug/L 25 10 1.1 10.2 4.741 95% Approx. Gamma UPL 23.99 26.56 Cobalt ug/L 13 2 0.51 1.37 0.94 95% UPL (NP) 1.37 1.37 Iron ug/L 25 25 152 1130 552.1 95% WH Approx. Gamma UPL 1632 1727 Lead ug/L 25 0 --- --- --- --- --- --- Manganese ug/L 25 25 27 683 164.8 95% WH Approx. Gamma UPL 678.8 729.4 Sodium ug/L 15 15 8.76 56 30.77 95% UPL (NP) 56 56 Strontium ug/L li 11 85 391 206.7 95% UPL (NP) 391 391 Thallium ug/L 25 0 --- --- --- --- --- --- Total Dissolved Solids mg/L 25 25 82 430 313.1 95% UPL (NP) 444 444 Vanadium u /L 12 11 0.637 6.63 3.326 95% Approx. Gamma UPL 20.32 22.59 Prepared by: MCD Checked by: HHS Notes: UPL - Upper Prediction Limit NP - Non -parametric Gamma - Gamma data transformation Lognormal - Lognormal data transformation P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 4-7 Transition Zone Background.xlsx Page 1 of 1 TABLE 4-8 GROUNDWATER BEDROCK BACKGROUND RESULTS MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Constituent Units Number of Samples Number of Detected Samples Minimum Detected Concentration Maximum Detected Concentration Mean Statistical Method UPL (12 Future Samples) UPL (27 Future Samples) Antimony ug/L 38 5 1.32 1.9 1.626 95% Approx. Gamma UPL 4.312 5.089 Arsenic ug/L 38 4 1.02 1.8 1.233 95% KM UPL (Lognormal) 0.931 0.931 Barium ug/L 38 35 5 105 65.53 95% UPL (NP) 101.2 101.2 Boron ug/L 38 1 --- 65 --- --- --- --- Chromium (VI) ug/L 15 6 0.19 18.4 7.483 95% Approx. Gamma UPL 46.15 62.35 Chromium ug/L 38 14 1 24.1 11.55 95% Approx. Gamma UPL 52.97 66.79 Cobalt ug/L 26 4 1.01 1.41 1.175 95% Approx. Gamma UPL 3.507 4.244 Iron ug/L 38 38 29 2730 623.8 95% WH Approx. Gamma UPL 3929 4663 Lead ug/L 38 1 --- 0.13 --- --- --- --- Manganese ug/L 38 38 7 648 145 95% UPL (NP) 630.9 630.9 Sodium ug/L 26 26 11.5 60.2 26.06 95% UPL 64.1 68.57 Strontium ug/L 24 24 131 430 237.3 95% UPL (NP) 427 427 Thallium ug/L 38 2 0.323 0.538 0.431 95% UPL (NP) 0.334 0.334 Total Dissolved Solids mg/L 38 38 106 370 190.3 95% UPL (NP) 360.5 360.5 Vanadium u /L 25 23 0.381 14.5 4.011 95% Approx. Gamma UPL 28.2 34.19 Prepared by: MCD Checked by: HHS Notes• UPL - Upper Prediction Limit NP - Non -parametric Gamma - Gamma data transformation Lognormal - Lognormal data transformation P:\Duke Energy Progress.1026\105. Mayo Ash Basin GW Assessment Plan\19.EG_CSASUP\Tables\Table 4-8 Bedrock Background.xlsx Page 1 of 1