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Home My WebLink AboutNC0003468_SARP_Rev0_Appendix D_Vol2_20161201Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Namel10: AB-30SR AS-30D AB-30D AB-30S AB-30S AB-35BR AB-35BR Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 9/1012015 612412015 9111/2015 612912015 9110/2015 612512015 911012015 N N N N N N N DR-AB-30BR-NS-36115 AB-30D DR-AB-30D-NS-3015 AB-30S DR-AB-30S-NS-3Q15 AB-35BR DR-AB-35BR-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS 1L 100 U 100 U 100 U 110 100 U 100 U 100 U Aluminum T 7429-90-5 NS 1L 270 94 J 250 130 J 3400 190 75 J Antimony D 7440-36-0 NS 1L 0.5 U 2 0.43 J 0.5 UJ 0.5 U 0.51 0.5 U Antimony T 744036--0 1 IMAC p 1L 0,5 U 1.5 0.9 2.6 J 0,5 U 0.48 J 0.5 U Arsenic D 7440-38-2 NS 1L 0.78 0.46 J 0.35 J 0.5 UJ 0.5 U 12 9.3 Arsenic T 7440-38-2 10 02L p IL 0.94 0,41 J 0.41 J+ 0.5 U 0.96 11.7 10.5 J Barium D 7440-39-3 NS 1L 110 82 91 120 110 210 370 Barium T 7440-39-3 700 02L IL 100 110 95 130 160 240 360 Beryllium D 744041-7 NS 1L 0.2 U 0.2 U 0.2 U 0.2 UJ 0.44 0.2 U 0,2 U Beryllium T 7440-41-7 4 IMAC p 1L 0,2 U 0,2 U 0.2 U 0,45 0.84 0,2 U 0.2 U Boron D 744042-8 NS p 1L 310 240 290 300 320 270 220 Boron T 7440-42-8 700 02L p 1L 300 250 270 290 310 270 240 Cadmium D 744043-9 NS p 1L 0.08 U 0,08 U 0.08 U 0,08 UJ 0.064 J 0,08 U 0.08 U Cadmium T 7440-43-9 2 02L fL 0,08 U 0,08 U 0.08 U 0,086 0,075 J 0,08 U 0.08 U Calcium T 7440-70-2 NS 1L 70400 52300 57200 8580 5720 84300 79000 Chromium D 7440-47-3 NS IL 0,21 J 2 J+ 0,75 0,78 J+ 0.2 J 1.5 J+ 0,55 Chromium T 744047-3 10 02L p IL 1.7 2.7 3.3 0.99 J+ 10.4 3.8 2.3 J Cobalt D 7440-48-4 NS IL 0.5 U 0,18 J 0,27 J 0.5 UJ 24.9 0,24 J 0.5 U Cobalt T 744048-4 1 IMAC p IL 0.23 J 0.3 J 0.44 J 29 30.7 0.26 J 0.14 J Copper D 7440-50-8 NS IL 1 U 4.5 J+ 0,57 J 2.2 J+ 0,98 J 1.7 J+ 1 U Copper T 7440-50-8 1000 02L IL 0.91 J 0,71 J+ 1.9 0.97 J+ 7.9 3.3 J+ 0.86 J Iron D 7439-89-6 NS 1L 94 50 U 50 J 39 J 33 J 50 U 50 U Iron T 7439-89-6 300 02L p 1L 460 97 380 1101 4200 150 93 J Lead D 7439-92-1 NS fL 0.1 U 0,051 J+ 0.1 0.1 UJ 0.39 0,062 J+ 0.1 U Lead T 7439-92-1 15 02L 1L 0.18 0.14 0.29 0.44 J+ 5.1 0.16 0.12 Magnesium T 7439-95-4 NS IL 11900 7830 9230 5360 4040 14700 13000 Manganese D 7439-96-5 NS IL 400 280 380 1600 1400 390 150 Manganese T 7439-96-5 50 02L p 1L 380 430 360 1500 1100 410 220 Mercury ❑ 7439-97-6 NS 1L 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L 1L 0.15 J 0.2 U 0,2 UJ 0.2 U 0,12 J 0.2 U 0.2 U Methane N 74-82-8 NS 1L 40 23.5 J+ 20.5 15.8 J+ 16.5 J+ 20.2 J+ 22.3 J Molybdenum D 7439-98-7 NS IL 2,9 2.8 1.3 0.5 U 0.5 U 20 21,3 Molybdenum T 7439-98-7 NS p 1L 3.2 2.5 1.9 0.5 U 0.29 J 21.4 19.9 J Nickel D 7440-02-0 NS 1L 0,85 1.5 J+ 13 0,38 J+ 7.8 1.1 J+ 0.77 Nickel T 7440-02-0 100 02L 1L 1.8 1.9 J+ 2.7 8.6 J+ 11.7 IA J+ 1.4 J Potassium T 7440-09-7 NS 1L 5000 U 5000 U 5000 U 5000 U 5000 U 13500 14200 Selenium D 778249-2 NS p 1L 0.5 U 0.28 J 0.5 U 0.5 U 0,5 U 0.32 J 0,5 U Selenium T 7782-49-2 20 02L p /L 0,5 U 0,5 U 0.31 J 0.5 U 0.24 J 0,67 0.5 U Sodium T 7440-23-5 NS 1L 15900 13800 15400 29400 29600 34400 158000 Strontium D 7440-24-6 NS 1L 870 340 420 150 150 550 730 Strontium T 7440-24-6 NS 1L 770 400 450 150 110 650 690 Thallium D 7440-28-0 NS 1L 0,1 U 0,1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC p IL 0.1 U 0.1 U 0,1 U 0.02 J 0.093 J 0.1 U 0.1 U Vanadium D 7440-62-2 NS IL 1 U 0.96 J 0.57 J 1 UJ 1 U 0.99 J 1.5 Vanadium T 7440-62-2 0.3 IMAC p 1L 0.67 J 0.86 J 1.1 1 U 18.3 1.8 1.8 J Zinc D 7440-66-6 NS 1L 10 U 3 J+ 21 15 J+ 58 4.4 J 10 U Zinc T 7440-66-6 1000 02L p IL 20 4 J+ 43 13 J+ 32 9.6 J+ 3.7 J Total Dissolved Solids N TDS 500000 02L p IL 377000 249000 304000 183000 174000 410000 9050001 Total Organic Carbon N TOC NS 1L 21000 1000 U 1000 U 650 J 760 J 12900 198000 J Total Suspended Solids N TSS - NS 1L 14300 2500 U 37600 2500 U 69400 13300 68000 J Alkalinity, CO3 Ni ALK-CO3 NS p 1L 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS 1L 133000 90900 87800 6200 3600 J 187000 197000 Alkalinity, lab N ALK-LAB NS 1L 133000 90900 J- 1 87800 6200 3600 J 187000 197000 Chloride N 16887-00-6 250000 02L IL 18000 22100 21900 10200 10400 18800 33600 J Nitrite as N N 14797-65-0 -- 1000 02L p 1L Nitrogen, NO2 plus NO3 N NO2-NO3 NS 1L 20 U 13 J+ 20 U 20 UJ 20 U 17 J+ 20 U Sulfate N 14808-79-8 250000 02L p IL 106000 71500 79400 81500 74200 129000 195000 J Sulfide N 18496-25-8 NS /L 100 U 100 U 100 U 100 U 100 U 100 U 6500 J- As(III) T 7784-46-5 NS 1L 0.158 0.2 U 9.84 J As V T 10103-60-3 NS IL 0.12 0.2 U 0.66 Chromium VI T 18540-29-9 0.07 DHHS p 1L 1.38 0:026 J+ 0,871 J Fe II T 1345-25-1 NS 1L 10.1 119 7,3 J+ Fe(Ill) T 1309-37-1 NS p 1L 20 U 20 U 20 UJ Mn II T 134443-0 NS /L 292 1540 406 J+ Mn(IV) T 1313-13-9 NS IL 85.2 2.5 UJ 16.9 J+ IV T 10102-18-8 NS IL 0.5 U 0.5 U 0.5 U rSe Se i T 13410-01-0 NS p IL 0.5 U 0.5 U 0.5 UJ Uranium, Natural T 7440-61-1 NS 1L Page 3 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Namel10: AB-30SR AS-30D AB-30D AB-30S AB-30S AB-35BR AB-35BR Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 9/1012015 612412015 9111/2015 612912015 9110/2015 612512015 911012015 N N N N N N N DR-AB-30BR-NS-36115 AB-30D DR-AB-30D-NS-3015 AB-30S DR-AB-30S-NS-3Q15 AB-35BR DR-AB-35BR-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS CiIL Radium-228 T 15262-20-1 NS pCi1L Uranium-233 T 13968-55-3 NS 1L Uranium-234 T 13966-29-5 NS 1L Uranium-236 T 13982-70-2 NS I 1L ❑ ssolved Oxygen N ❑D NS mqjI 0.2 0.6 2.83 0.2 0,84 0.02 Temp Celsius N TEMP -- NS Deg C 26.8 23 21.9 25.3 28.9 32 H (field) N PH 6.5 8.5 02L SU 7.3 7.4 4.92 4.9 7.57 7.8 Turbidity. field N TURB NS NTU 9.4 9.7 7.9 8.2 6.27 7,77 Spec. Cond. field N SC NS Slcm 555 443.9 264.6 255 618 585 Oxidation Reduction. Potential N ORP NS mV -90.6 -90.1 281.7 293.3 124.7 -214A GW Depth TOC N IGW DEPTH-T00 NS ft Notes: pg/L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TQC = total organic carbon Page 4 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: AB-5D AB-51) MW-10 MW-10 MW-10D MW-10D MW-11 Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round i (CSA Sampling) 6/18/2015 9/9/2015 6/2512015 9/1112015 612412015 9111/2015 6129/2015 N N N N N N N AB-5D DWAS-SD-NS-3015 MW-10 DR-MW-10-NS-3415 MW-10D DR-MW-10D-NS-3015 MW-11 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS 1L 100 U 100 U 100 U 100 U 100 U 100 U Aluminum T 7429-90-5 NS 1L 62 J 180 100 J 100 U 100 U 160 Antimony D 7440-36-0 NS 1L 0.5 U 0.5 U 0.5 J 0.5 U 0.5 U 0.5 U Antimony T 744036--0 1 1 IMAC p 1L 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Arsenic D 7440-38-2 NS 1L 8.8 14A 0.5 J 0.5 U 0.5 U 0.5 U Arsenic T 7440-38-2 10 02L p 1L 1 8.5 13.9 0.5 U 0.5 U 0.5 U 0,14 J Barium D 7440-39-3 NS 1L 89 64 29 40 45 63 Barium T 7440-39-3 700 02L 1L 89 67 32 45 46 72 Beryllium D 744041-7 NS 1L 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.42 Beryllium T 7440-41-7 4 IMAC p 1L 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.5 Boron D 744042-8 NS p 1L 560 630 460 440 460 240 Boron T 7440-42-8 700 1 02L p 1L 500 650 460 460 440 230 Cadmium D 744043-9 NS p 1L 0.08 J 0.08 U 0,08 U 0.08 J 0.08 J 0.034 J Cadmium T 7440-43-9 2 02L 1L 0,08 U 0,08 U 0,08 U 0.08 U 0,08 U 0,038 J Calcium T 7440-70-2 NS 1L 34900 J- 40100 41000 33600 33200 2850 Chromium D 7440-47-3 NS 1L 0.2 J+ 0.5 U 3.6 0,28 J+ 0.5 U 0.36 J+ Chromium T 744047-3 10 02L p IL 3.3 1.2 6.6 0.27 J 0,34 J 1.2 J+ Cobalt D 7440-48-4 NS 1L 1.9 5A 0,19 J 0,59 0,59 28.5 Cobalt T 744048-4 1 IMAC p 1L 1 5.5 0.28 J 0.57 0.57 29.2 Copper D 7440-50-8 NS 1L 0.25 J 0,24 J 1 U 1 U 12 0.54 J+ Copper T 7440-50-8 1000 02L IL 0,51 J 0,51 J 1 U 0.43 J 0.45 J+ 2 J+ Iron D 7439-89-6 NS 1L 63 1100 50 U 130 120 50 U Iron T 7439-89-6 300 02L p 1L 140 1400 50 J 170 150 400 Lead D 7439-92-1 NS 1L 0.1 U 0A8 J 0.1 U 0.1 U 0,88 0,09 J+ Lead T 7439-92-1 15 02L 1L 0.058 J 0.12 0.1 U 0.048 J 0.063 J 1.2 J+ Magnesium T 7439-95-4 NS 1L 7180 7270 13600 11000 11000 1810 Manganese D 7439-96-5 NS IL 1000 1300 5 U 990 950 890 Manganese T 7439-96-5 5D 02L p 1L 1000 1300 13 1000 930 880 Mercury ❑ 7439-97-6 NS 1L 0.1 J 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L 1L 0.2 U 0.2 U 0.2 U 0.2 U 0.2 UJ 0.2 U Methane N 74-82-8 NS p 1L 19.1 J+ 83.8 1.5 J+ 1.5 J+ 13 10 UJ 1.6 J+ Molybdenum D 7439-98-7 NS 1L 3.6 4.4 0.5 U 0.13 J 0.15 J 0.5 U Molybdenum T 7439-98-7 NS p 1L 3.5 4.4 0.5 U 0.13 J 0.13 J 0.5 U Nickel D 7440-02-0 NS 1L 3 J+ 7 1 A 2.1 1.9 5.5 J+ Nickel T 7440-02-0 100 02L 1L 4.2 7.8 2 2A 1.7 J+ 5.6 J+ Potassium T 7440-09-7 NS 1L 13900 13300 5000 U 5000 U 5000 U 5000 U Selenium D 778249-2 NS p 1L 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p 1L 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Sodium T 7440-23-5 NS 1L 28400 32800 15800 17300 18200 19800 Strontium D 7440-24-6 NS 1L 390 470 690 270 300 54 Strontium T 7440-24-6 NS 1L 380 460 720 300 300 59 Thallium D 7440-28-0 NS 1L 0,018 J+ 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC p IL 0.024 J 0.1 U 0.1 U 0.1 U 0.1 UJ 0.023 J Vanadium D 7440-62-2 NS 1L 1 U 1 U 1 U 1 U 1 U 0.46 J Vanadium T 7440-62-2 0.3 IMAC p 1L 0.77 J 1 U 1 U 1 U 1 U 2.6 Zinc D 7440-66-6 NS 1L 3.8 J 10 U 10 U 10 UJ 10 U 5.7 J+ Zinc T 7440-66-6 1000 02L p IL 5.6 J+ 3.7 J 10 U 10 U 10 U 6.8 J+ Total Dissolved Solids N TDS 500000 02L p 1L 247000 253000 233000 297000 214000 213000 118000 Total Organic Carbon N TOC NS p 1L 1000 J 590 J 1200 1400 510 J 30100 1400 Total Suspended Solids N TSS - NS 1L 5000 7400 5000 U 2500 U 3300 38300 Alkalinity, CO3 Ni ALK-CO3 NS 1L 5000 J 5000 U 5000 U 5000 U 5000 J 5000 U 5000 J Alkalinity, HCO3 N ALK-HCO3 NS 1L 131000 129000 124000 135000 95300 89200 5000 U Alkalinity, lab N ALK-LAB NS 1L 131000 129000 124000 135000 95300 89200 5000 U Chloride N 16887-00-6 250000 02L 1L 15500 14200 20400 22700 24100 23200 6500 Nitrite as N N 14797-65-0 -- 1000 02L p 1L Nitrogen, NO2 plus NO3 N NO2-NO3 NS 1L 20 U 20 U 1500 640 J- 11 J 20 UJ 110 J+ Sulfate N 14808-79-8 250000 02L p IL 45200 55700 26800 28800 41300 42200 48100 Sulfide N 18496-25-8 NS 1L 100 U 100 U 100 U 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS 1L As V T 10103-60-3 NS 1L Chromium VI T 18540-29-9 0.07 DHHS p 1L Fe II T 1345-25-1 NS 1L Fe(Ill) T 1309-37-1 NS p 1L Mn II T 134443-0 NS 1L Mn(IV) T 1313-13-9 NS p 1L Se IV T 10102-18-8 NS 1L Se I T 13410-01-0 NS p IL Uranium, Natural T 7440-61-1 NS 1L 0.?d7 J Page 5 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: AB-51) AB-51) MW-10 MW-10 MW-10D MW-10D MWA1 Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round i (CSA Sampling) 6/18/2015 9/9/2015 6/2512015 9/1112015 612412015 9111/2015 6129/2015 N N N N N N N AB-5D DWAS-SD-NS-3015 MW-10 DR-MW-10-NS-3415 MW-10D DR-MW-10D-NS-3015 MW-11 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCill- 1 UJ Radium-228 T 15262-20-1 NS pCi1L 3 U Uranium-233 T 13968-55-3 NS 1L 0.05 U Uranium-234 T 13966-29-5 NS 1L 0.05 U Uranium-236 T 13982-70-2 NS I 1L 0.05 U ❑ ssolved Oxygen N 00 NS mqjI 0.2 5A 1.74 0.62 3.61 Temp Celsius N TEMP -- NS Deg C 24.8 20.8 20.4 19.1 24.5 H((field) N PH 6.5 8.5 02L SU 6.3 6.21 6.2 6.22 4.77 Turbidity. field N TURB NS NTU 8.5 5.4 1.2 1.1 5.53 Spec. Cond. field N SC NS Slem 431,1 340 330 336 160.5 Oxidation Reduction. Potential N CRP NS mV -33.1 119 163 80 398 GW Depth TOC N IGW DEPTH -TOO NS ft 1 13.28 1 18,3 50 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 6 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NamellD: MW-11 MW-11D MW-308SR MW-308BR MW-310BR MW-310BR MW-311t3R Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 9/11/2015 6/29/2015 6115/2015 9/9/2015 6/1612015 9/912015 6/29/2015 N N N N N N N DR-MW-11-NS-3415 MW-11D MW-308BR DR-MW-308BR-NS-3015 MW-310SR DR-MW-31OBR-NS-3015 MW-311BR Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS /L 100 U 100 U 9.7 J+ 100 U 5.7 J 100 U 100 U Aluminum T 7429-90-5 NS /L 790 740 483 120 659 580 910 Antimony D 7440-36-0 NS /L 0.5 U 0.5 U 0.22 J 0.5 U 0.32 J I A 0.22 J Antimony T 7440-36-0 1 IMAC p /L 0.5 U 0.5 U 0.24 J 0,39 J 0,34 J 0.99 0.3 J Arsenic D 7440-38-2 NS /L 0.5 U 0.18 J 1.7 0:67 1.1 2.7 0.35 J Arsenic T 7440-38-2 10 02L p /L 0.5 U 0,25 J 1,8 0.79 1.3 2.5 0.32 J Barium D 7440-39-3 NS /L 71 54 69 69 56 33 94 Barium T 7440-39-3 700 02L /L 81 54 76 i 69 57 46 110 Beryllium D 744041-7 NS /L 0,46 0.2 U 0.2 U 7 0.2 U 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p 1L 0,46 0.2 U 0.2 U 01 U 0.2 U 0.2 U 0,2 U Boron D 744042-8 NS p /L 290 91 260 J+ 440 31 J 49 J 700 Boron T 7440-42-8 700 02L p /L 280 87 260 360 35 J+ 40 J 690 Cadmium D 744043-9 NS p /L 0,046 J 0.08 U 0:08 U 0.08 U 0.08 U 0,08 U 0.08 U Cadmium T 7440-43-9 2 02L /L 0,046 J 0,08 U 0.08 U 0,08 U 0,08 U 0,08 U 0,08 U Calcium T 7440-70-2 NS /L 3270 62500 169000 232000 34700 26100 53400 Chromium D 7440-47-3 NS /L 0.24 J 1.1 J+ 0.5 U 0,17 J 1.7 J+ 0.63 0,37 J+ Chromium T 744047-3 10 02L p IL 0.58 1.5 J+ 1.5 0.8 2.3 2.8 3.3 J+ Cobalt D 7440-48-4 NS /L 33.9 0,5 U 0.32 J 14,7 0.5 U 0,5 U 0,52 Cobalt T 744048-4 1 IMAC p /L 30.5 0.22 J 0.6 9.3 0.2 J 0.21 J 0.84 Copper D 7440-50-8 NS /L 2,5 0.55 J+ 1 U 1 U 0,26 J+ 0.36 J 1 UJ Copper T 7440-50-8 1000 02L IL 0,49 J+ 1.8 J+ 0,54 J'+ 0.46 J 0.91 J+ 1.2 2.6 J+ Iron D 7439-89-6 NS /L 50 U 50 U 1190 7600 50 U 50 U 380 Iron T 7439-89-6 300 02L p /L 1300 850 1910 5300 377 410 1200 Lead D 7439-92-1 NS /L 0.24 0.1 U.! 0.1 U 0.1 U 0,1 UJ 0.058 J 0.1 UJ Lead T 7439-92-1 15 02L /L 0.32 0.29 J+ 0.22 J+ 0.16 0.88 1.1 0.53 J+ Magnesium T 7439-95-4 NS /L 2090 8020 28000 42800 6510 3980 11200 Manganese D 7439-96-5 NS IL 930 100 2000 7700 120 8.2 570 Manganese T 7439-96-5 50 02L p /L 910 130 2200 5400 110 37 680 Mercury ❑ 7439-97-6 NS /L 0.2 U 0.2 U 0.2 U 0.2 U 0.092 J+ 0.2 U 0.2 U Mercury T 7439-97-6 1 02L /L 0.2 UJ 0,2 U 0.2 UJ 02 U 0.082 J+ 0,2 U 0,2 U Methane N 74-82-8 NS /L 2.1 J+ 7.6 J+ 27 32.8 10 U 4.4 J+ 8.5 J+ Molybdenum D 7439-98-7 NS WIL 0.5 U 3A 7,6 0.61 1.8 3.4 5 Molybdenum T 7439-98-7 NS p /L 0.5 U 2A 8.1 1.8 1.9 2.9 5 Nickel D 7440-02-0 NS /L 6 1A J+ 0.98 J+ 11.9 0,35 J+ 1.1 2,9 J+ Nickel T 7440-02-0 100 02L /L 5.9 1 A J+ 1.7 J+ 8.2 0.88 J+ 2.3 4 J+ Potassium T 7440-09-7 NS /L 5000 U 3050 J 5000 U 5000 U 5000 U 5000 U 5910 Selenium D 778249-2 NS p /L 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.39 J 0.5 U Selenium T 7782-49-2 20 02L p /L 0.5 U 0.5 U 0.5 U 0.5 U 021 J 0.41 J 0,5 U Sodium T 7440-23-5 NS /L 21200 14000 20100 23300 21200 23600 23800 Strontium D 7440-24-6 NS /L 64 480 1200 2000 190 160 920 Strontium T 7440-24-6 NS /L 64 510 1300 1700 200 190 980 Thallium D 7440-28-0 NS /L 0.1 U 0.1 U 0.1 U 0.1 U 0,1 UJ 0.1 U 01 U Thallium T 7440-28-0 0.2 IMAC p /L 0.017 J+ 0.021 J 0.1 U 0.1 U 0.1 UJ 0.016 J 0.016 J Vanadium D 7440-62-2 NS WIL 0.67 J 0.5 J+ 1 U 1 U 2.1 4.9 0.38 J+ Vanadium T 7440-62-2 0.3 IMAC p /L 0.58 J 1 U 0.84 J 1 U 2.5 3.7 0.89 J Zinc D 7440-66-6 NS /L 15 10 UJ 9.8 J+ 3,1 J 10 U 10 U 3.8 J+ Zinc T 7440-66-6 1000 02L p /L 6.5 J 4.6 J+ 6.8 J+ 31 5.7 J 6.7 J 15 J+ Total Dissolved Solids N TDS 500000 02L p /L 143000 304000 844000 1300000 183000 161000 318000 Total Organic Carbon N TOC NS /L 1500 1000 U 610 J 1000 U 800 J 840 J 27400 Total Suspended Solids N TSS - NS !L 1 11400 9200 19700 16400 36700 41400 55300 Alkalinity, CO3 Ni ALK-CO3 NS p /L 5000 U 5000 U 10000 U 5000 U 10000 U 8800 5000 U Alkalinity, HCO3 N ALK-HCO3 NS /L 5000 U 124000 170000 140000 110000 73700 154000 Alkalinity, lab N ALK-LAB NS /L 5000 U 124000 170000 140000 110000 82500 154000 Chloride N 16887-00-6 250000 02L 1L 7600 23600 11600 13100 11600 12700 22000 Nitrite as N N 14797-65-0 -- 1000 02L p /L Nitrogen, NO2 plus NO3 N NO2-NO3 NS /L 100 J- 65 J+ 20 U 11 J 20 U 20 U 14 J+ Sulfate N 14808-79-8 250000 02L p /L 48600 70000 323000 586000 14100 18700 53000 Sulfide N 18496-25-8 NS /L 100 U 100 U 200 U 100 U 1000 U 100 U 100 U As(III) T 7784-46-5 NS /L As V T 10103-60-3 NS /L Chromium VI T 18540-29-9 0.07 DHHS p /L Fe II T 1345-25-1 NS /L Fe(Ill) T 1309-37-1 NS p /L Mn II T 134443-0 NS /L Mn(IV) T 1313-13-9 NS p /L Se IV T 10102-18-8 NS !L Se l T 13410-01-0 NS p /L Uranium, Natural T 7440-61-1 NS !L 1 0,397 Page 7 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NamellD: MWA1 MW-11D MW-308SR MW-308BR MW-310BR MW-310BR MW-311BR Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 {CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 9/11/2015 6/29/2015 6115/2015 9/9/2015 6/1612015 9/912015 6/29/2015 N N N N N N N DR-MW-11-NS-3415 MW-11D MW-308BR DR-MW-308BR-NS-3015 MW-310SR DR-MW-31OBR-NS-3015 MW-311BR Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCill- 2.02 Radium-228 T 15262-20-1 NS pCi1L 3 U Uranium-233 T 13968-55-3 NS 1L 0.05 U Uranium-234 T 13966-29-5 NS 1L 0,05 U Uranium-236 T 13982-70-2 NS !L 0.05 U ❑ ssolved Oxygen N 00 NS m 1I 0.06 2,24 0.49 0.2 0,28 0.9 0,77 Temp Celsius N TEMP -- NS Deg C 19.8 22 31A 22.3 32.8 25.2 24 H (field) N PH 6.5 8.5 02L SU 3.11 7.78 7.05 6.6 8,16 8.8 7,05 Turbidity. field N TURB NS NTU 26 5.26 5.45 6.2 9.92 9.1 39.18 Spec. Cond. field N SC NS S/cm 147 454A 1096 1628 283.9 241.3 505 Oxidation Reduction. Potential N CRP NS mV 185 132.5 -20.4 -89 121:6 75.8 -120.9 GW Depth TOC N IGW DEPTH -TOO NS ft 13.84 18.1 Notes: pg1L = micrograms per liter pS1cm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 8 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name11D: MW-311BR MW-314SR MW-314BR MW-9 MW-911) MW-9D Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 9/11/2015 6/2512015 9111/2015 6/3012015 6124/2015 9/11/2015 N N N N N N DR-MW-311BR-NS-3015 MW-3148R DR-MW-314BR-NS-3015 MW-9 MW-9D DR-MW-9D-NS-3015 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS 1L 100 U 100 U 100 U 100 U 100 U 100 U Aluminum T 7429-90-5 NS IL 560 350 120 250 2400 1300 Antimony D 7440-36-0 NS 1L 0.5 U 0.53 1.3 0.5 U 0.5 U 0.5 U Antimony T 744036--0 1 1 IMAC p 1L 0,5 U 0,47 J 1.6 0,5 U 0.5 U 0,27 J Arsenic D 7440-38-2 NS 1L 0.18 J 0.36 J 1.7 0.14 J 0.5 U 0.5 U Arsenic T 7440-38-2 10 02L p 1L 0.5 U 0.3 J 1,8 J+ 0.27 J 0,21 J 0,12 J+ Barium D 7440-39-3 NS 1L 94 19 20 64 4 J 3.5 J Barium T 7440-39-3 700 02L 1L 110 24 25 70 19 22 Beryllium D 744041-7 NS 1L 0.2 U 0.2 U 0.2 U 0.11 J 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p 1L 01 U 0,2 U 0,2 U 0,21 0.19 J 0,1 J Boron D 744042-8 NS p 1L 790 510 460 50 U 1000 1000 Boron T 7440-42-8 700 02L p 1L 810 500 490 28 J 1000 1100 Cadmium D 744043-9 NS p 1L 0.08 U 0,08 U 0,08 U 0.08 U 0,15 0.059 J Cadmium T 7440-43-9 2 02L 1L 0,08 U 0,08 U 0,03 J 0,031 J 1,8 0.12 Calcium T 7440-70-2 NS 1L 53900 47400 48600 11400 21100 20800 Chromium D 7440-47-3 NS 1L 0.25 J 0.87 J+ 0.32 J 2,5 0,45 J+ 0.58 Chromium T 744047-3 10 02L p IL 2.1 5 0.96 J+ 1.8 J+ 7.1 3.6 Cobalt D 7440-48-4 NS 1L 0.13 J 0.5 U 0,5 U 5,6 0.28 J 0,37 J Cobalt T 744048-4 1 IMAC p 1L 0.52 0.34 J 0.17 J 6.4 1.5 2.7 Copper D 7440-50-8 NS 1L 1.1 2,1 J+ 43 1 UJ 0.34 J 8.4 Copper T 7440-50-8 1000 02L IL 0.72 J 1.2 J+ 0.79 J+ 10.9 8.7 3.1 J+ Iron D 7439-89-6 NS 1L 470 50 U 28 J 340 50 U 50 U Iron T 7439-89-6 300 02L p 1L 1100 380 160 990 2600 1400 Lead D 7439-92-1 NS 1L 0.25 0,1 U 0.77 0.1 U 0.1 U 0.92 Lead T 7439-92-1 15 02L 1L 0.38 0.21 0.15 1.4 1.6 0.78 Magnesium T 7439-95-4 NS 1L 11500 13400 12900 7310 9180 9190 Manganese D 7439-96-5 NS IL 510 15 70 1600 540 610 Manganese T 7439-96-5 50 02L p 1L 540 25 65 1000 600 1100 Mercury ❑ 7439-97-6 NS 1L 0.2 U 0.23 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L 1L 0.2 U 0,2 U 0.2 U 0.095 J 0.2 U 0.2 U Methane N 74-82-8 NS 1L 11.4 2.5 J+ 18.3 1.6 J+ 10 a 12.8 J+ Molybdenum D 7439-98-7 NS 1L 0,6 0,72 J+ 21 0.1 J 9,7 9A Molybdenum T 7439-98-7 NS p 1L 0:63 0.91 2 0.5 U 10.1 9.4 Nickel D 7440-02-0 NS 1L 2,6 1.2 J+ 1,5 1.7 2.6 33 Nickel T 7440-02-0 100 02L 1L 3.1 3.4 J+ 1.9 J+ 1.2 J+ 5.2 4.2 J+ Potassium T 7440-09-7 NS 1L 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Selenium D 778249-2 NS p 1L 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p 1L 0.5 U 0,5 U 0.5 U 0,5 U 0.5 U 0.5 U Sodium T 7440-23-5 NS 1L 16900 11400 13200 14300 25400 26800 Strontium D 7440-24-6 NS 1L 920 160 170 120 100 130 Strontium T 7440-24-6 NS 1L 930 160 170 130 120 140 Thallium D 7440-28-0 NS 1L 0.1 U 0.1 U 0,039 J 0,1 U 0.1 U 0,1 U Thallium T 7440-28-0 0.2 IMAC p IL 0.1 U 0.016 J 0.045 J+ 0.1 U 0.035 J 0.016 J+ Vanadium D 7440-62-2 NS 1L 0.5 J 0.65 J 0.63 J 0.47 J 0.5 J 0.74 J Vanadium T 7440-62-2 0.3 IMAC p 1L 0.62 J 1.3 0.82 J 2.3 11.1 2.7 Zinc D 7440-66-6 NS 1L 10 U 10 U 5.9 J 8,5 J 10 UJ 10 U Zinc T 7440-66-6 1000 02L p IL 8.9 J 5.5 J+ 7.9 J 8.5 J 6.1 J 4.8 J Total Dissolved Solids N TDS 500000 02L p 1L 1 272000 261000 289000 113000 238000 213000 Total Organic Carbon N TOC NS 1L 1000 U 1000 U 1000 U 1700 1000 U 1000 U Total Suspended Solids N TSS - NS 1L 18500 12600 14500 2500 U 49000 264000 Alkalinity, CO3 Ni ALK-CO3 NS p 1L 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS 1L 127000 56700 60000 35200 32400 29600 Alkalinity, lab N ALK-LAB NS 1L 127000 56700 60000 35200 32400 29600 Chloride N 16887-00-6 250000 02L WIL 23000 30500 30500 13000 J- 20000 19900 Nitrite as N N 14797-65-0 -- 1000 02L p 1L Nitrogen, NO2 plus NO3 N NO2-NO3 NS 1L 20 U 20 U 20 U 230 20 U 20 U Sulfate N 14808-79-8 250000 02L p IL 53800 95800 98200 36100 87300 91400 Sulfide N 18496-25-8 NS 1L 100 U 100 U 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS 1L As V T 10103-60-3 NS 1L Chromium VI T 18540-29-9 0.07 DHHS p 1L Fe II T 1345-25-1 NS 1L Fe(Ill) T 1309-37-1 NS p 1L Mn II T 134443-0 NS /L Mn(IV) T 1313-13-9 NS 1L IV T 10102-18-8 NS 1L re e I T 13410-01-0 NS p IL Uranium, Natural T 7440-61-1 NS 1L Page 9 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NameflD: MW-311BR MW-314SR MW-314BR MW-9 MW-91) MW-9D Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 9/11/2015 6/2512015 9111/2015 6/3012015 6124/2015 9/11/2015 N N N N N N DR-MW-311BR-NS-3015 MW-3148R DR-MW-314BR-NS-3015 MW-9 MW-9D DR-MW-9D-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS CiIL Radium-228 T 15262-20-1 NS pCi1L Uranium-233 T 13968-55-3 NS 1L Uranium-234 T 13966-29-5 NS 1L Uranium-236 T 13982-70-2 NS I 1L Dissolved Oxygen N 00 NS m 1I 0.25 0.99 0,38 1,68 0.52 0,21 Temp Celsius N TEMP -- NS Deg C 18 26.7 21.6 21.7 20.8 22.8 H (field) N PH 6.5 8.5 02L SU 6.9 7.39 7,64 6,73 6.57 6.44 Turbidity. field N TURB NS NTU 20.6 7.63 8.35 84,09 66 48.29 Spec. Cond. field N SC NS Slcm 807 414.9 306.2 219A 324 228.9 Oxidation Reduction. Potential N CRP NS mV -47.1 108.3 -129.3 179.9 145 110.8 GW Depth TOC N IGW DEPTH -TOO NS ft 45.1 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TQC = total organic carbon Page 10 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NameIID: AS-10D AS-10D AS-12D AS-12S AS-12S AS-213 AS-2111) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 6/812015 9/812015 619/2015 619/2015 918/2015 6117/2015 91312015 N N N N N N N AS-10D DR-AS-10D-NS-3015 ❑R AS-12D_WG_20150609 AS-12S DR-AS-I2S-NS-3015 AS-21) DR-AS-2D-NS-3015 Constituent Fractlon CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS NIL 578 810 13A J+ 100 U 100 U 100 U Aluminum T 7429-90-5 NS pqII. 730 920 554 J+ 100 U 760 650 Antimony D 7440-36-0 NS pWL 2.7 3A 0,24 J 0.5 U 0.5 U 0.5 U Antimony T 7440-36-0 1 IMAC p IL 2.9 3.8 0,23 J 0.5 U 0.16 J 0,5 U Arsenic D 7440-38-2 NS pqIL 8.5 7.6 0.48 J 0.23 J 0.24 J 0.17 J Arsenic T 7440-38-2 10 02L p L 8,9 7,5 0.52 0.28 J 0.29 J 0.38 J Barium D 7440-39-3 NS pqIL 30 16 33 31 120 170 Barium T 7440-39-3 700 02L pqIL 32 19 37 29 130 190 Beryllium D 7440-41-7 NS pqJL 0.2 U 0,2'U 0.2 U 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 0.2 U 0.2 U 0.2 U 0.2 U 0.096 J 0,1 J Boron D 7440-42-8 NS p IL 50 U 26 J 1000 1300 150 360 Boron T 7440-42-8 700 02L p L 29 J 31 J 1000 1200 160 410 Cadmium D 7440-43-9 NS p IL 0,08 U 0:08 U 0.2 0,036 J 0.08 u 0.08 U Cadmium T 7440-43-9 2 02L uQJL 1 0,08 U 0,08 U 0,19 0.04 J 0.041 J 0,08 U Calcium T 7440-70-2 NS IL 65000 49900 40700 45900 72500 96600 Chromium D 7440-47-3 NS pqjL 2 J 2,2 0.22 J+ 0,49 J 0,58 0.73 Chromium T 744047-3 10 02L NIL 2.4 2.9 1.1 J+ 1.1 J+ 1.4 2.3 Cobalt D 7440-48.4 NS pqjL 0,5 U 0.5 U 2 1.2 1,6 0,81 Cobalt T 744048-4 1 IMAC p IL 0.5 U 0.5 U 2.2 1.3 2.1 1.2 Copper D 7440-50-8 NS pqjL 0,76 J+ 3,6 0.4 J+ 6,8 0.76 J+ 0.46 J Copper T 7440-50-8 1000 02L IL 1.2 J+ 2.1 1.1 J+ 0.46 J 1 UJ 1.1 Iron D 7439-89-6 NS pqIL 50 U 50 U 82,6 370 1800 1800 Iron T 7439-89-6 300 02L p IL 35.6 J 69 928 450 2900 2800 Lead D 7439-92-1 NS qjL 0,077 J 0,69 0.1 U 0,51 0.1 U 0.17 Lead T 7439-92-1 15 02L p IL 0.1 U 0.095 J 0.5 J+ 0.11 0.54 0.48 Magnesium T 7439-95-4 NS pqjL 59.2 J 100 U 30600 35700 16700 27400 Manganese D 7439-96-5 NS p IL 5 U 5 U 420 330 1500 1900 Manganese T 7439-96-5 SO 02L p L 5 U 3A J 430 320 1500 2100 Mercury D 7439-97-6 NS p IL 0,2'U 0,2 U 0.2 U 0.2 U 0.2 UJ 0.2 U Mercury T 7439-97-6 1 02L pqJL 0.2 U 0.2 U 0.12 J 0.2 U 0.085 J+ 0,2 U Methane N 74-82-8 NS p IL 10 U 14.4 J+ 10 U 9.4 J+ 10 U 5.8 J+ Molybdenum D 7439-98-7 NS pqjL 3,8 4,5 2.8 0.59 1 0.84 Molybdenum T 7439-98-7 NS p IL 3.9 4.7 2.5 0,64 1 0.86 Nickel D 7440-02-0 NS pqIL 0.5 U 0.4 J 9,6 5,7 1.8 J+ 1.6 Nickel T 7440-02-0 100 02L pqIL 0.23 J 0.92 9.8 5A 2.8 J+ 2.4 Potassium T 7440-09-7 NS IL 5000 U 4210 J 5000 U 5000 U 3120 J 5000 U Selenium D 7782-49-2 NS p IL 28.8 31.3 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p IL 35.3 31 0.5 U 0.5 U 0.5 U 0.5 U Sodium T 7440-23-5 NS p iL 9700 11800 29000 33600 29700 26600 Strontium D 7440-24-6 NS pqIL 320 300 600 700 510 630 Strontium T 7440-24-6 NS pgYL 350 350 600 660 530 700 Thallium D 7440-28-0 NS pqjL 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC p IL 0.1 U 0.1 U 0.1 U 0.1 U 0.061 J 0.023 J+ Vanadium D 7440-62-2 NS pqjL 13.3 30.6 0.29 J 0.32 J 0.32 J 1 U Vanadium T 7440-62-2 0.3 IMAC NIL 15.3 30.6 1.1 0.52 J 1.6 1.4 Zinc D 7440-66-6 NS pqIL t0 U 3.3 J 10 U 27 8A J 2,7 J Zinc T 7440-66-6 1000 02L p IL 5A J+ 6.3 J 4,2 J+ 43 16 J+ 4.8 J Total Dissolved Solids N TDS 500000 02L p L 220000 J- 202000 350000 321000 405000 498000 Total Organic Carbon N TOC NS pqIL 1000 U 1600 1600 1500 1500 1200 Total Suspended Solids N TSS NS IL 1100 5000 U 89000 2500 U 189000 133000 Alkalinity, CO3 N ALK-CO3 NS p IL 63000 54900 10000 U 5000 U 10000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS pQJL 23000 5000 U 190000 192000 170000 224000 Alkalinity, lab N ALK-LAB - NS pqJL 100000 77200 190000 192000 170000 224000 Chloride N 16887-00-6 250000 02L PQJL 20300 19700 18700 21400 16900 17100 Nitrite as N N 14797-65-0 1000 02L L Nitrogen, NO2 plus NO3 N NO2-NO3 NS uWL 20 U 20 U 32 20 U 20 U 20 U Sulfate N 14808-79-8 250000 02L p IL 43900 43800 71700 83100 J- 90600 135000 Sulfide N 18496-25-8 NS IL 100 U 100 U 200 U 100 U 100 U 100 U As(III) T 7784-46-5 NS pqjL As V T 10103-60-3 NS pqjL Chromium VI T 18540-29-9 0.07 ❑HHS pq1L Fe II T 1345-25-1 NS pqIL Fe(Ill) T 1309-37-1 NS p IL Mn II T 1344-43-0 NS piplL Mn(IV) T 1313-13-9 NS pqJL Se IV T 10102-18-8 NS /L Se I T 13410-01-0 NS L Uranium, Natural T 7440-61-1 NS pqIL Page 1 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name11D: AS-10D AS-10D AS-12D AS-12S AS-12S AS-213 AS-2D Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 6/812015 9/812015 619/2015 619/2015 918/2015 6117/2015 91312015 N N N N N N N AS-10D DR-AS-10D-NS-3015 ❑R AS-12D_WG_20150609 AS-12S DR-AS-I2S-NS-3015 AS-21) DR-AS-2D-NS-3015 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCi1L Radium-228 T 15262-20-1 NS Ci1L Uranium-233 T 13968-55-3 NS u 11 Uranium-234 T 13966-29-5 NS u 1l Uranium-236 T 13982-70-2 NS ugh ❑ ssolved Oxygen N DO NS m 1L 2.38 2.2 1.29 025 0.12 Temp Celsius N TEMP NS Deg C 27.5 24.9 30.1 242 24.4 H (field) N PH 6.5 8.5 02L Su 10.67 10.7 5.95 6.1 6.32 Turbidity. field N TURB -- NS NTU 3.58 4.3 926 1.47 6.12 Spec. Cond. field N SC NSPS/cm 582 3B8.5 606 643 553 Oxidation Reduction. Potential N ORP NS mV 104 -21.7 222.2 167.6 -180.9 GW Depth OC N JGW DEPTH-T{] NS I I ft 26A2 18,43 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCVL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 2 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: AS-41D AS-4D AS-41) AS-61) AS-6D AS-88R AS-8BR Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 GSA Sampling) Round 2 3Q-2015 61512015 6126/2015 9/312015 618/2015 918/2015 6/9/2015 918/2015 N N N N N N N AS-41) AS-4111) DR-AS-4D-NS-3015 AS-61) DR-AS-6D-NS-3Q15 AS-8BR DR-AS-BBR-NS-3Q15 Constituent Fractlon CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS NIL 5.1 J 98 J 7.8 J 100 U 13.3 J+ 100 U Aluminum T 7429-90-5 NS pqIL 2990 1001 206 110 331 J+ 100 U Antimony D 7440-36-0 NS pWL 0.5 U 0.5 U 0.16 J 0.5 U 0.5 U 0.5 U Antimony T 7440-36-0 1 IMAC p IL 0,5 U 0,5 U 0.24 J 0,5 U 0.21 J 0.5 U Arsenic D 7440-38-2 NS IL 1.5 1.5 1.5 0.86 0.16 J 0.5 U Arsenic T 7440-3B-2 10 02L p L 1,8 1,6 2 0.88 0.34 J 0.12 J Barium D 7440-39-3 NS pqIL 86 88 43 42 78 77 Barium T 7440-39-3 700 02L pqIL 97 100 45 49 95 86 Beryllium D 7440-41-7 NS pqJL 0.2'U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 0,18 J 0,2 U 0.2 U 0.2 U 0.2 U 0,2 U Boron D 7440-42-8 NS p IL 730 800 33 J 50 U 33 J 50 U Boron T 7440-42-8 700 02L p L 810 930 37 J 25 J 45 J 50 U Cadmium D 7440-43-9 NS p IL 0.08 U 0,08 U 0.08 U 0.08 U 0.08 U 0.08 U Cadmium T 7440-43-9 2 02L uQJL 1 0,08 U 0.08 U 0,08 U 0,08 U 0,08 U 0,08 U Calcium T 7440-70-2 NS IL 72800 88700 16300 18000 84600 66600 Chromium D 7440-47-3 NS pqjL 0,2 J+ 0.19 J+ 0.24 J 0.32 J IA J+ 0.3 J Chromium T 7440-47-3 10 02L p IL 3.3 0.91 J+ 0.47 J 1.9 J+ 4.4 0.5 UJ Cobalt D 7440-48.4 NS pqjL 2A 2.7 1A 0.59 0,5 U 0,5 U Cobalt T 7440484 1 IMAC p IL 4 2.9 1.1 0.7 0.15 J 0.5 U Copper D 7440-50-8 NS pqjL 1 UJ 1 UJ 1 U 0.78 J 1 U 1 U Copper T 7440-50-8 1000 02L IL 3.6 J+ 1 U 0.54 J+ 0.84 J+ 0,88 J 0.25 J+ Iron D 7439-89-6 NS pqIL 1 158 170 2880 3100 206 150 Iron T 7439-89-6 300 02L p 1L 4480 250 J+ 3920 3400 466 170 J+ Lead D 7439-92-1 NS pqIL 0,089 J 0,059 J+ 0.1 U 0.14 0,048 J+ 0.1 U Lead T 7439-92-1 15 02L p IL 1.7 0.28 J 0.087 J 0.24 J+ 0.19 J+ 0.1 U Magnesium T 7439-95-4 NS pqjL 37500 44600 20300 26300 10800 11600 Manganese D 7439-96-5 NS p IL 700 770 260 220 790 920 Manganese T 7439-96-5 SO 02L p L 770 870 270 250 910 950 Mercury D 7439-97-6 NS p JL 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L uWL 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0,2 U Methane N 74-82-8 NS p IL 41 221 J 68 106 20 15.6 J+ Molybdenum D 7439-98-7 NS pqjL 6,8 7,6 0.64 0.15 J 1 A J+ 0.13 J Molybdenum T 7439-98-7 NS p IL 7.2 7.8 0.35 J 0.2 J 1.8 0.14 J Nickel D 7440-02-0 NS pqIL 2.1 2.5 J+ 1.5 J 0.88 0,85 J+ 0,34 J Nickel T 7440-02-0 100 02L 1L 5.2 J+ 3 1,5 1.3 J+ 1.2 J+ 0.33 J+ Potassium T 7440-09-7 NS /L 2600 J 2770 J 5000 U 5000 U 4810 J 5000 U Selenium D 7782-49-2 NS p IL 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p IL 0.5 U 0.5 U 0.5 U 0,5 U 0.5 U 0.5 U Sodium T 7440-23-5 NS p IL 22300 26100 20400 22800 14000 13000 Strontium D 7440-24-6 NS pqIL 920 970 150 150 400 380 Strontium T 7440-24-6 NS IL 980 1100 160 180 440 440 Thallium D 7440-28-0 NS pqjL 0.1 U 0.1 U 0.1 U 0.1 U 0.034 J 0.1 U Thallium T 7440-28-0 0.2 IMAC p IL 0.034 J 0.022 J+ 0.1 U 0.1 U 0.1 U 0.1 U Vanadium D 7440-62-2 NS pqjL 1 U 1 U 1 U 1 U 1.4 1 U Vanadium T 7440-62-2 0.3 IMAC NIL 4.8 1 U 0.69 J+ 0.4 J 2.7 1 U Zinc D 7440-66-6 NS pqIL 7,5 J 10 UJ 7.3 J 12 10 U 10 U Zinc T 7440-66-6 1000 02L p IL 2.6 J+ 10 U 12 J+ 18 4.5 J+ 10 U Total Dissolved Solids N TDS 500000 02L p L 410000 J- 432000 220000 J- 237000 370000 314000 Total Organic Carbon N TOC NS 1L 1200 1200 640 J 2000 U 1000 U 1000 U Total Suspended Solids N TSS NS /L 90000 47400 5500 12900 38000 2500 U Alkalinity, CO3 N ALK-CO3 NS p IL 10000 U 5000 U 10000 U 5000'U 10000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS pQJL 310000 336000 J 140000 152000 150000 158000 Alkalinity, lab N ALK-LAB - NS pqJL 310000 336000 J 140000 152000 150000 158000 J+ Chloride N 16887-00-6 250000 02L PQJL 21900 22400 16300 16500 8200 4800 Nitrite as N N 14797-65-0 1000 02L L Nitrogen, NO2 plus NO3 N NO2-NO3 NS pqIL 20 U 20 U 20 U 20 U 20 U 20 U Sulfate N 14808-79-8 250000 02L p 1L 44900 49400 15100 15600 74500 59700 Sulfide N 19496-25-8 NS IL 500 U 100 U 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS p IL 1.41 As V T 10103-60-3 NS pqjL 0.2 U Chromium VI T 18540-29-9 0.07 ❑HHS pq1L 0.007 J+ Fe II T 1345-25-1 NS pqIL 14B Fe(Ill) T 1309-37-1 NS p JL 20 U Mn II T 1344-43-0 NS L 951 Mn(IV) T 1313-13-9 NS pqJL 1 UJ Se IV T 10102-18-8 NS /L 0,5 U Se I T 13410-01-0 NS L 0.5 U Uranium, Natural T 1 7440-61-1 NS pqIL Page 3 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name11D: AS-41) AS-4D AS-41) AS-61) AS-6D AS-88R AS-8BR Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 GSA Sampling) Round 2 3Q-2015 61512015 6126/2015 9/312015 618/2015 918/2015 6/9/2015 918/2015 N N N N N N N AS-41) AS-4D DR-AS-4D-NS-3015 AS-61) DR-AS-6D-NS-3Q15 AS-8BR DR-AS-88R-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCi1L Radium-228 T 15262-20-1 NS Ci1L Uranium-233 T 13968-55-3 NS u 11 Uranium-234 T 13966-29-5 NS u 1l Uranium-236 T 13982-70-2 NS ugh ❑ ssolved Oxygen N DO NS m 1L 0.36 0.43 0.41 1,46 0,31 Temp Celsius N TEMP NS Deg C 25.2 27.8 24.8 24.6 19.8 H (field) N PH 6.5 8.5 02L Su 6.24 6.02 6 7,09 T07 Turbidity. field N TURB -- NS NTU 7.49 9.3 8.32 51.38 0.88 Spec. Cond. (fieldl SC NS S1cm 744 380.8 420.E 496.5 458 Oxidation Reduction. Potential N ORP NS mV 169.5 113.2 29.9 20 -59.4 GW Depth OC N JGW DEPTH -TO -- NS I ft 36.5 37,97 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective Januar+ 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 4 of 10 Corrective Action Plan Part 2 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name11D: AS -OD AS -OD AS-$D MW-301BR MW-3018R MW-3038R MW-303RR Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) 612I2015 6126/2015 9/912015 6/11/2015 9/412015 611212015 6/2212015 N N N N N N N AS-813 AS-8111] DR-AS-8D-NS-3015 MW-301BR DR-MW-301BR-NS-3015 MW-3038R MW-303SR Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS NIL 7 J 100 U 5.9 J 100 U 4.7 J Aluminum T 7429-90-5 NS pqIL 1530 62 J 202 230 J'+ 938 Antimony D 7440-36-0 NS pWL 1 UJ 0.5 U 0.5 U 0.5 U 0.16 J Antimony T 7440-36-0 1 IMAC p IL 1 UJ 0.5 U 0,16 J 0,5 U 0,25 J Arsenic D 7440-38-2 NS pqIL 1.2 J 0.41 J 0.84 0.64 6.4 Arsenic T 7440-38-2 10 02L p L 1,24 J 038 J 0,9 0,58 8,6 Barium D 7440-39-3 NS pqIL 64 69 33 21 69 Barium T 7440-39-3 700 02L pqIL 82 71 35 26 94 Beryllium D 7440-41-7 NS pqJL 1 UJ 0.2 U 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 1 UJ 0.2 U 0,2 U 0.2 U 0,2 UJ Boron D 7440-42-8 NS p IL 50 UJ 50 U 50 U 50 U 50 U' Boron T 7440-42-8 700 02L p L 50 UJ 50 U 50 U 50 U 29 J+ Cadmium D 7440-43-9 NS p IL 1 UJ 0,08 U 0.08 U 0:08 U 0,08 U Cadmium T 7440-43-9 2 02L uQJL 1 UJ 0,08 UJ 0,08 U 0.08 U 0,08 U Calcium T 7440-70-2 NS IL 47000 46700 43100 30200 34700 Chromium D 7440-47-3 NS pqjL 1 UJ 0.54 44 0,32 J 0,27 J Chromium T 744047-3 10 02L NIL 1.9 J 0.25 J+ 1.2 J+ 1 J+ 6.4 Cobalt 0 7440-48.4 NS pqjL 1 UJ 0.5 U 0,19 J 0,16 J 0.18 J Cobalt T 744048-4 1 IMAC p IL 1 UJ 0.5 U 0.26 J 0.24 J+ 0.95 Copper D 7440-50-8 NS PQjL 1 UJ 1 U 1 U 1A 1 U Copper T 7440-50-8 1000 02L IL 1 UJ 1 UJ 0.4 J 0.4 J 3.2 J+ Iron D 7439-89-6 NS pqIL 1160 700 146 330 2260 Iron T 7439-89-6 300 02L p IL 2900 890 383 J+ 690 J+ 2760 Lead 0 7439-92-1 NS qjL 1 UJ 0.1 U 0.1 U 0.13 0.1 U Lead T 7439-92-1 15 02L p IL 1 UJ 0.1 UJ 0.14 J+ 0.18 1.2 Magnesium T 7439-95-4 NS pqjL 11300 12300 8200 7900 9480 Manganese D 7439-96-5 NS p IL 1100 1000 400 410 510 Manganese T 7439-96-5 SO 02L p L 1140 1000 410 400 J+ 500 Mercury D 7439-97-6 NS p JL 0.05 U 0.2 U 0.2 U 0.2 U 0.2 U Cu T 7439-97-6 1 02L L 0.05 U 0.2 U 0.2 U 0.2 U 0,2 U Methane N 74-82-8 NS uo1L 10 U 24.5 J+ 10 U 5.1 J+ 10.2 J+ Molybdenum 0 7439-98-7 NS pqjL 1 UJ 0,13 J 1,2 0,71 1,5 Molybdenum T 7439-98-7 NS p IL 1 UJ 0.16 J 1.3 0.69 2.1 Nickel D 7440-02-0 NS pqIL 1 UJ 033 J 2.4 J+ 038 J 0.51 J+ Nickel T 7440-02-0 100 02L pqIL 1.59 J 0.28 J+ 0.93 J+ 0.68 4.8 J+ Potassium T 7440-09-7 NS 1L 1810 5000 U 5000 U 5000 U 3420 J Selenium D 7782-49-2 NS p IL 1 UJ 0.5 U 0.32 J 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p IL 1 UJ 0,5 U 0,39 J 0,5 U 0,33 J Sodium T 7440-23-5 NS p iL 15700 14500 10600 9730 17400 Strontium D 7440-24-6 NS pqIL 320 310 370 280 170 Strontium T 7440-24-6 NS pgYL 330 320 380 290 190 Thallium D 7440-28-0 NS pqjL 0.2 UJ 0.1 U 0.1 U 0.1 U 0,017 J Thallium T 7440-28-0 0.2 IMAC p IL 0.2 UJ 0.1 U 0.035 J 0.02 J 0.056 J Vanadium D 7440-62-2 NS pQJL 0.3 UJ 1 U 1.5 0.4 J 0.39.E Vanadium T 74,40-62-2 0.3 IMAC NIL 1.88 J 1 U 1.8 0.811 3.7 Zinc D 7440-66-6 NS pqIL 12 J 10 U IOU 13 J+ 8.4 J Zinc T 7440-66-6 1000 02L p IL 7 J 10 UJ 3.7 J 3 J 16 Total Dissolved Solids N TDS 500000 02L p L 250000 236000 210000 215000 J+ 272000 Total Organic Carbon N TOC NS pqIL 523 610 J 540 J 1000 U 760 J Total Suspended Solids N TSS NS 1L 38000 5000 U 9100 18200 13000 J Alkalinity, CO3 N ALK-CO3 NS p IL 10000 U 5000 U 10000 U 5000 U 10000 U Alkalinity, HCO3 N ALK-HCO3 NS pQJL 170000 160000 150000 108000 140000 Alkalinity, lab N ALK-LAB - NS pqJL 170000 160000 150000 108000 140000 Chloride N 16887-00-6 250000 02L pqjL 6800 6600 4400 4200 8300 Nitrite as N N 14797-65-0 1000 02L L 10 UJ Nitrogen, NO2 plus NO3 N NO2-NO3 NS pqIL 20 U 20 U 20 U 20 U Sulfate N 14808-79-8 250000 02L p IL 25000 20600 3300 2400 14900 Sulfide N 19496-25-8 NS JL 100 U 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS pqjL 0.593 As V T 10103-60-3 NS pqjL 0.2 U Chromium VI T 18540-29-9 0.07 ❑HHS p L 0.008 J+ Fe II T 1345-25-1 NS pqIL 974 Fe(Ill) T 1309-37-1 NS p JL 28300 Mn II T 1344-43-0 NS piplL 1210 Mn(IV) T 1313-13-9 NS pqJL 6A6 Se IV T 10102-18-8 NS pqjL 0.5 U Se(VI) T 13410-01-0 NS L 0.5 U Uranium, Natural T 7440-61-1 NS ijQIL Page 5 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name11D: AS-81) AS-8D AS-$D MW-301BR MW-3018R MW-3038R MW-303RR Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) 61212015 6126/2015 9/912015 6/11/2015 9/412015 611212015 6/2212015 N N N N N N N AS-813 AS-8D DR-AS-8D-NS-3015 MW-301BR DR-MW-301SR-NS-3015 MW-3038R MW-303SR Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCi1L Radium-228 T 15262-20-1 NS Ci1L Uranium-233 T 13968-55-3 NS u 11 Uranium-234 T 13966-29-5 NS u 1l Uranium-236 T 13982-70-2 NS ugh ❑ ssolved Oxygen N DO NS m 1L 0.35 0,26 0.51 0,27 Temp Celsius N TEMP NS Deg C 24.1 22.3 32A 32.7 H (field) N PH 6.5 8.5 02L Su 6.83 6,62 6,9 6,56 Turbidity. field N TURB -- NS NTU 38.05 7.1 9.78 9.25 Spec. Cond. (fieldl SC NS PSI= 411.6 371 337.E 282.8 Oxidation Reduction. Potential N ORP NS mV 38.5 -35.7 44 26.2 GW Depth OC N JGW DEPTH -TO NS I ft 38.65 Notes: pg1L = micrograms per liter pS1cm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective Januar+ 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TQC = total organic carbon Page 6 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name11D: MW-3038R MW-306BR MW-306SR MW-306SR MW-3158R MW-3156R Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 91412015 6/12/2015 6/22/2015 914/2015 6/19/2015 9/8/2015 N N N N N N DR-MW-303BR-NS-3015 MW-306BR MW-306BR DR-MW-306BR-NS-3015 MW-3158R DR-MW-315BR-NS-3015 Constituent Fractlon CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS NIL 100 U 7.9 J 100 U 100 U 100 U Aluminum T 7429-90-5 NS pqIL 660 J+ 96.2 J- 600 790 100 U Antimony D 7440-36-0 NS pWL 0,36 J 0.43 J 0.5 U 0.29 J+ 0.5 U Antimony T 7440-36-0 1 IMAC p IL 0.95 0,38 J 0.2 J 0.21 J 0,5 U Arsenic D 7440-38-2 NS pqIL 2.5 1.1 0.9 0.16 J 0,18 J Arsenic T 7440-38-2 10 02L p L 4,5 1 1 0.19 J 0.33 J Barium D 7440-39-3 NS pqIL 71 150 140 58 59 Barium T 7440-39-3 700 02L pqIL 94 150 160 71 22 Beryllium D 7440-41-7 NS pqJL 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 0,095 J 0.2 U 0,2 U 0,2 U 0.16 J Boron D 7440-42-8 NS p IL 50 U 940 1500 50 U 50 U Boron T 7440-42-8 700 02L p L 50 U 920 1700 50 U 50 U Cadmium D 7440-43-9 NS p IL 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U Cadmium T 7440-43-9 2 02L uQJL 1 0.08 U 0.08 U 0.08 U 0,08 U 0.029 J Calcium T 7440-70-2 NS IL 38600 91500 143000 40200 48400 Chromium D 7440-47-3 NS pqjL 0.28 J 0,31 J 0,29 J 0.32 J+ 0,19 J Chromium T 744047-3 10 02L NIL 7.2 1 A J+ 3.2 J+ 24.8 6 Cobalt D 7440-48.4 NS pqjL 0,13 J 0,45 J 1,2 1.2 J+ 0,48 J Cobalt T 744048-4 1 IMAC p IL 0.46 J+ 0.5 U IA 2.2 2.6 Copper D 7440-50-8 NS PQjL 5,5 1 U 0,8 J+ 1 U 1 U Copper T 7440-50-8 1000 02L IL 28.3 1 U 1.4 J+ 2.4 5.2 J+ Iron D 7439-89-6 NS pqIL 2200 582 3100 86 39 J Iron T 7439-89-6 300 02L p IL 3400 J+ 623 J 4000 1300 27 J Lead D 7439-92-1 NS pqIL 0,28 0.1 U 0,065 J 0.1 U 0.11 Lead T 7439-92-1 15 02L p IL 0.68 0.095 J 0.43 0.81 1 A Magnesium T 7439-95-4 NS pqjL 12200 26600 57900 22600 14900 Manganese D 7439-96-5 NS p IL 530 930 2200 1500 1100 Manganese T 7439-96-5 SO 02L p L 590 J+ 920 2400 181i0 2,6 J+ Mercury D 7439-97-6 NS p JL 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L pqJL 0.2 U 02 U 0.2 U 0,2 U 0.2 U Methane N 74-82-8 NS p IL 13A J+ 20.4 J+ 10 UIJ 10.9 J+ 4.6 J+ Molybdenum D 7439-98-7 NS pqjL 2,1 2.3 4.5 0,36 J+ 0,21 J Molybdenum T 7439-98-7 NS p IL 2.6 1.9 4.3 0.94 0,28 J Nickel D 7440-02-0 NS pqIL 3 2 J+ 3.5 1.2 J+ 0.78 Nickel T 7440-02-0 100 02L pqIL 5 2.2 J+ 4.1 16A 5.3 Potassium T 7440-09-7 NS IL 3740 J 4290 J 2970 J 5000 U 5000 U Selenium D 7782-49-2 NS p IL 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p IL 0,2 J 0.5 U 0,22 J 0,5 U 0.5 U Sodium T 7440-23-5 NS p iL 19200 24200 32900 22100 15000 Strontium D 7440-24-6 NS pqIL 180 730 1200 420 460 Strontium T 7440-24-6 NS pgYL 210 740 1400 460 63 Thallium D 7440-28-0 NS pqjL 0.1 U 0.1 U 0.1 U 0,1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC p IL 0.018 J 0.1 U 0,018 J 0:024 J 0.028 J Vanadium D 7440-62-2 NS pqjL 0,28 J 1.5 1 U 1 U 1 U Vanadium T 7440-62-2 0.3 IMAC NIL 2 1.6 1.6 1.4 5.5 Zinc D 7440-66-6 NS pqIL 9 J+ 2.5 J 19 J+ 130 2.8 J Zinc T 7440-66-6 1000 02L p IL 16 51 38 13 4.5 J Total Dissolved Solids N TDS 500000 02L p L 260000 J+ 530000 778000 J+ 277000 228000 Total Organic Carbon N TOC NS pqIL 580 J 900 J 530 J 810 J 1000 U Total Suspended Solids N TSS NS IL 31200 6300 J 14100 222000 63600 Alkalinity, CO3 N ALK-CO3 NS p IL 5000 U 10000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS pQJL 145000 160000 190000 176000 148000 Alkalinity, lab N ALK-LAB - NS pqJL 145000 160000 190000 J- 176000 148000 Chloride N 16887-00-6 250000 02L pqjL 9700 21600 29700 10400 5600 Nitrite as N N 14797-65-0 1000 02L L Nitrogen, NO2 plus NO3 N NO2-NO3 NS pqIL 20 U 20 U 20 UJ 20 U 20 UJ Sulfate N 14808-79-8 250000 02L p IL 16700 187000 345000 38400 39500 Sulfide N 18496-25-8 NS 7L 100 U 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS pqjL As V T 10103-60-3 NS pqjL Chromium VI T 18540-29-9 0.07 ❑HHS pq1L Fe II T 1345-25-1 NS pqIL Fe(Ill) T 1309-37-1 NS p JL Mn II T 1344-43-0 NS L Mn(IV) T 1313-13-9 NS pqJL Se IV T 10102-18-8 NS /L Se I T 13410-01-0 NS L Uranium, Natural T 7440-61-1 NS pqIL Page 7 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name11D: MW-3038R MW-306BR MW-306SR MW-306SR MW-3158R MW-3156R Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 91412015 6/12/2015 6/22/2015 914/2015 6/19/2015 9/8/2015 N N N N N N DR-MW-303BR-NS-3015 MW-306BR MW-306BR DR-MW-306BR-NS-3015 MW-3158R DR-MW-315BR-NS-3015 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCi/L Radium-228 T 15262-20-1 NS Ci/L Uranium-233 T 13968-55-3 NS u !I Uranium-234 T 13966-29-5 NS u 1l Uranium-236 T 13982-70-2 NS ugh ❑ ssolved Oxygen N DO NS m 1L 0.48 2,51 0.63 Temp Celsius N TEMP NS Deg C 29.4 19.5 30 H (field) N PH 6.5 8.5 02L Su 6.96 6.7 7.25 Turbidity. field N TURB -- NS NTU 8.39 13.34 21,23 Spec. Cond. (fieldl SC NS PSI= 727 368 385,3 Oxidation Reduction. Potential N ORP NS mV 3.3 -24.9 23 GW Depth OC N JGW DEPTH -TO NS ft Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective Januar+ 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TQC = total organic carbon Page 8 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Location: Event: Sample Date: Sample Type Code: Sample Name11D: MW-317BR MW-3181) MW-318D OW-303D Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 2 3Q-2015 6/512015 61212015 9/912015 9/12/2015 N N N N MW-317BR MW-3180 DR-MW-318D-NS-3Q15 DR•OW-303D-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS NIL 520 21 J 100 U 100 U Aluminum T 7429-90-5 NS pqIL 649 510 120 7400 Antimony D 7440-36-0 NS pWL 1 1 UJ 0.5 U 2 Antimony T 7440-36-0 1 IMAC p IL 2.1 1 UJ 0,5 U 2.9 Arsenic D 7440-38-2 NS IL 0.63 1 UJ 1 40.2 Arsenic T 7440-38-2 10 02L p L 0,71 1 UJ 0,93 55 Barium D 7440-39-3 NS pqIL 46 35 J 34 210 Barium T 7440-39-3 700 02L pqIL 58 41 J 37 320 Beryllium D 7440-41-7 NS pqJL 0,2'U 1 UJ 0.31 0,11 J Beryllium T 7440-41-7 4 IMAC p IL 0.2 U 1 UJ 0,31 2,1 Boron D 7440-42-5 NS p IL s0 U 1250 1300 1200 Boron T 7440-42-8 700 02L p L 44 J 1310 1300 1000 Cadmium D 7440-43-9 NS p IL 0,08 U 1 UJ 0.068 J 0,44 Cadmium T 7440-43-9 2 02L pqjL 0,08 U 1 UJ 0,068 J 0,65 Calcium T 7440-70-2 NS IL 107000 21100 24900 52800 J- Chromium D 7440-47-3 NS pqjL 8,4 1 UJ 0.38 J 0.27 J+ Chromium T 744047-3 10 02L NIL 11 2.8 J 0.69 J+ 15.1 Cobalt D 7440-48.4 NS pqjL 0.5 J 12,9 J 6.6 47.8 Cobalt T 7440484 1 IMAC p IL 0.5 J 13 J 6.7 53.2 Copper D 7440-50-8 NS pqjL 4.8 J+ 1.38 J 2 J 1.4 J+ Copper T 7440-50-8 1000 02L IL 1.6 J+ 9.7 J 0,56 J 37.6 J+ Iron D 7439-89-6 NS pqIL 50 J 588 490 9200 Iron T 7439-89-6 300 02L p IL 128 1150 720 14900 Lead D 7439-92-1 NS pqIL 0,77 1 UJ 0.36 0A49 J+ Lead T 7439-92-1 15 02L p IL 0.15 1 UJ 0.38 12.1 Magnesium T 7439-95-4 NS pqjL 670 12700 15400 26100 Manganese D 7439-96-5 NS p IL IOU 607 390 5000 Manganese T 7439-96-5 SO 02L p L 8.7 577 430 4500 Mercury D 7439-97-6 NS p IL 0,2'U 0.05 J 0.2 U 0.2 JJ Mercury T 7439-97-6 1 02L pqJL 0.2 U 0.05 U 0.2 U 0.2 U Methane N 74-82-8 NS p IL 20 U 10 U 9.3 J+ 131 Molybdenum D 7439-98-7 NS pqjL 5,1 1 UJ 0,5 U 5,5 Molybdenum T 7439-98-7 NS p IL 5.6 1 UJ 0.5 U 7A Nickel D 7440-02-0 NS pqIL 0,5 UJ 12.4 J 10.7 20,1 Nickel T 7440-02-0 100 02L IL 0.54 J+ 15A J 11.3 31.4 J+ Potassium T 7440-09-7 NS 1L 15600 1700 5000 U 9510 Selenium D 7782-49-2 NS p IL 0,53 1 UJ 1.2 0.5 U Selenium T 7782-49-2 20 02L p IL 0,75 1,03 J 1 2,2 Sodium T 7440-23-5 NS p IL 18700 35400 26500 35600 Strontium D 7440-24-6 NS pqIL 450 589 650 1800 Strontium T 7440-24-6 NS IL 570 604 650 1900 Thallium D 7440-28-0 NS pqjL 0.1 J 0.2 UJ 0.1 U 0,26 Thallium T 7440-28-0 0.2 IMAC p IL 0,1 J 0.2 UJ 0.1 U 0.56 Vanadium D 7440-62-2 NS pQJL 8.5 0.3 UJ 1 U 0.91 J Vanadium T 7440-62-2 0.3 IMAC NIL 8.4 0.654 J 1 U 36.5 Zinc D 7440-66-6 NS pqIL 10 U 78 34 J 2700 Zinc T 7440-66-6 1000 02L p IL 10 UJ 71 25 3000 Total Dissolved Solids N TDS 500000 02L p L 350000 J- 270000 257000 377000 Total Organic Carbon N TCC NS IL 1100 738 1200 J+ 14900 Total Suspended Solids N TSS NS 1L 14000 J- 9000 6200 1320000 Alkalinity, CO3 N ALK-CO3 NS p IL 130000 10000 U 5000 U 145000 J+ Alkalinity, HCO3 N ALK-HCO3 NS pQJL 10000 U 83000 71000 98000 Alkalinity, lab N ALK-LAB - NS pqJL 270000 83000 71000 243000 Chloride N 16887-00-6 250000 02L pqjL 8000 9100 8800 29400 Nitrite as N N 14797-65-0 1000 02L L 10 UJ Nitrogen, NO2 plus NO3 N NO2-NO3 NS pqIL 20 J 20 U 27 Sulfate N 14808-79-8 250000 02L p IL 15500 91000 90500 42900 Sulfide N 19496-25-8 NS 7L 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS p IL As V T 10103-60-3 NS pqjL Chromium VI T 18540-29-9 0.07 ❑HHS pq1L Fe II T 1345-25-1 NS pqIL Fe(Ill) T 1309-37-1 NS p IL Mn II T 1344-43-0 NS L Mn(IV) T 1313-13-9 NS pqJL IV T 10102-18-8 NS pqjL re .(VI) T 13410-01-0 NS L Uranium, Natural T 7440-61-1 NS pqIL Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Page 9 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Location: Event: Sample Date: Sample Type Code: Sample Name11D: MW-317BR MW-3181) MW-318D OW-303D Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 2 3Q-2015 6/512015 61212015 9/912015 9/12/2015 N N N N MW-317BR MW-3180 DR-MW-318D-NS-3Q15 DR•0W-303D-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCi1L Radium-228 T 15262-20-1 NS Ci/L Uranium-233 T 13968-55-3 NS u !I Uranium-234 T 13966-29-5 NS u 1l Uranium-236 T 13982-70-2 NS ugh ❑ ssolved Oxygen N DO NS m 1L 1.38 1.5 0,22 Temp Celsius N TEMP NS Deg C 21.1 21.1 26.9 H (field) N PH 6.5 8.5 02L Su 11." 5.51 5.23 Turbidity. field N TURB -- NS NTU 3.12 10.63 6.08 Spec. Cond. field N SC NS PSI= 1399 404 379.3 Oxidation Reduction. Potential N ORP NS mV -29.3 241.9 194.5 GW Depth OC N JGW DEPTH-Tod—NS I it Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective Januar+ 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Page 10 of 10 Table 2-9 Groundwater Results Gowngradient of the Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: GWA-10D GWA-10D GWA-1UD GWA-11D GWA-11D GWA-115 GWA-14D Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) 6/4/2015 6/26/2015 9/8/2015 61512015 9/3/2015 611012015 6130/2015 N N N N N N N GWA-10D GWA-10D DR-GWA-10D-NS-3015 GWA-11D DR-GWA-11D-NS-3015 GWA-11S GWA-14D Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS uglL 9 100 U 3.3 J 100 U 6.5 J 100 U Aluminum T 7429-90-5 NS pqIL 6940 1100 425 J+ 330 53 90 J Antimony D 7440-36-0 NS uglL 1 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Antimony T 7440-36-0 1 IMAC NIL 1 U 0,5 U 0.5 U 0.5 U 0,18 J 0.5 U Arsenic D 7440-38-2 NS IL 1 U 0.5 U 0.2 J 0.28 J 0.14 J 0.36 J Arsenic T 7440-38-2 10 02L pIL 1 U 0.4 J 0.25 J 0,39 J 0,18 J 0.38 J Barium D 7440-39-3 NS u IL 55 32 60 55 24 75 Barium T 7440-39-3 700 02L pgIL 136 65 64 63 25 78 Beryllium D 7440-41-7 NS u 1L 1 U 0.13 J 0.2 U 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 1 U 0,36 0.2 U 0.2 U 0,2 U 0.2 U Boron D 7440-42-8 NS W IL 172 300 50 U 50 U 100 250 Boron T 7440-42-8 700 02L pgIL 298 310 50 U 50 U 110 260 Cadmium D 7440-43-9 NS u 1L 1 U 0.033 J 0.08 U 0.08 U 0.039 J 0.08 U Cadmium T 7440-43-9 2 02L pgIL 1 1 U 0,049 J 0.08 U 0.08 U 0,046 J 0,08 U Calcium T 7440-70-2 NS IL 24200 19800 48000 55500 9730 66200 Chromium D 7440-47-3 NS pgIL 1 U 2.2 0,28 J+ 2.3 J+ 7.7 0,28 J Chromium T 7440-47-3 10 02L W IL 9.93 23.3 1 A J+ 22+2 15.6 0.27 J+ Cobalt D 7440-48-4 N pgIL 2.11 0.71 1,2 1 A 2.9 0,2 J Cobalt T 7440-48-4 1 IMAC W IL 3.45 1.1 II A 1.7 3.3 0.23 J Copper D 7440-50-8 NS pgIL 7.79 J+ 1.2 0,29 J+ 4 0,28 J 0.28 J+ Copper T 7440-50-8 1000 02L W IL 8.24 4.2 J+ 0,57 J+ 1.3 0.44 J 1 UJ Iron D 7439-89-6 NS IL 146 64 1180 2200 134 50 U Iron T 7439-89-6 300 02L g IL 6040 1100 1700 3200 227 140 Lead D 7439-92-1 NS ppIL 1.04 0,16 0.1 U 0,41 J+ 0,1 U 0.1 U Lead T 7439-92-1 15 02L pgIL 9.42 2.3 0.26 0.24 0.11 0.1 U Magnesium T 7439-95-4 N5 pqIL 13100 13000 16600 20000 5140 7420 Manganese D 7439-96-5 NS pgIL 453 160 730 890 1200 290 Manganese T 7439-96-5 50 02L g IL 509 130 810 980 1200 300 Mercury D 7439-97-6 NS u IL 0.05 U 02 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L pgIL 0.05 U 0.2 U 0.2 U 0.2 U 0,81 J+ 0.2 U Methane N 74-82-8 NS lL 10 U 1.6 J+ 27 11A J+ 13 62 J+ Molybdenum D 7439-98-7 NS IL 1 U 0,095 J 0.97 11 0,46 J 12.5 Molybdenum T 7439-98-7 NS W IL 1 U 0.53 0,87 1.6 0.7 J+ 13 Nickel D 7440-02-0 NS IL 6,43 8.8 1.1 J+ 11.3 13.9 0.51 Nickel T 7440-02-0 100 02L pgIL 11.1 19.3 1.7 J+ 20.5 17 0.46 J+ Potassium T 7440-09-7 NS pgIL 3210 5000 U 5000 U 5000 U 5000 U 5000 U Selenium D 7782-49-2 NS IL 1 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L pgIL 1 U 0.22 J 0.5 U 0.5 U 0,5 U 0.5 U Sodium T 7440-23-5 NS W IL 23400 17800 18100 19300 12500 21100 Strontium D 7440-24-6 NS pgIL 381 360 440 450 240 1700 Strontium T 7440-24-6 NS u IL 481 430 480 500 240 1800 Thallium D 7440-28-0 NS pgIL 0.2 U 0.1 U 0.1 U 0.1 U 0,1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC IL 0.256 0.03 J 0.1 U 0.1 UJ 0.1 U 0.1 U Vanadium D 7440-62-2 NS pgIL 0.324 0.29 J 1 U 1 U 0.34 J 0.5 J Vanadium T 7440-62-2 0.3 IMAC W IL 3.36 1.3 1.2 J+ 0.45 J 0.52 J 0_.67 J Zinc D 7440-66-6 NS pgIL 13 45 11 3.7 J+ 7.6 J 10 U Zinc T 7440-66-6 1000 02L W IL 43 J+ 110 43 J+ 6 J 2.7 J+ 4.1 J Total Dissolved Solids N TDS 500000 02L p IL 220000 208000 240000 J- 291000 10000 U 325000 Total Organic Carbon N TCC NS IL 459 J+ 1100 930 J 1100 860 J 650 J Total Suspended Solids N TSS NS pgIL 15000 14000 53000 3800 8600 6500 Alkalinity, CO3 N ALK-0O3 NS u IL 10000 U 5000 U 10000 U 5000 U 10000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS L 39000 39800 180000 187000 57000 132000 Alkalinity, lab N ALK-LAB NS IL 39000 39800 180000 187000 57000 132000 Chloride N 16887-00-6 250000 02L pgIL 14000 11300 10900 10700 10000 13800 Nitrite as N N 14797-65-0 1000 02L W IL 232 Nitrogen, NO2 plus NO3 N NO2-NO3 NS IL 290 20 U 20 U 75 20 UJ Sulfate N 14808-79-8 250000 02L g IL 3300 72400 37100 37200 4400 88500 Sulfide N 19496-25-8 NS PqIL 4000 UJ 100 U 200 U 100 U 100 U 100 U As(III) T 7784-46-5 NS IL 0.2 U As V T 10103-60-3 NS IL 0.2 U Chromium VI T 18540-29-9 0.07 DHHS W IL 0.105 Fe II T 1345-25-1 NS pgIL 92 Fe(Ill) T 1309-37-1 NS W IL 20 U Mn II T 134443-0 NS L 296 Mn(IV) T 1313-13-9 NS IL 1 UJ Se IV T 10102-18-8 NS IL 0.091 Se l T 1341MI-0 NS pgIL 0.5 U Uranium, Natural T 7440-61-1 NS IL Page 1 of 12 Table 2-9 Groundwater Results Gowngradient of the Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: GWA-10D GWA-10D GWA-10D GWA-11D GWA-11D GWA-11S GWA-14D Round 1 {CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) 6/4/2015 6/26/2015 9/8/2015 61512015 9/3/2015 611012015 6130/2015 N N N N N N N GWA-10D GWA-10D DR-GWA-10D-NS-3015 GWA-11D DR-GWA-11D-NS-3015 GWA-11S GWA-14D Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCill- Radium-228 T 15262-20-1 NS Ci/L Uranium-233 T 13968-55-3 NS u 1L Uranium-234 T 13966-29-5 NS pg1L Uranium-236 T 13982-70-2 NS 1L ❑ ssolved Oxygen N DO NS m IL 1.15 1.08 0,47 4.74 0.58 Temp Celsius N TEMP NS Deq C 18.8 28.7 26.1 26.7 19 H((field) N PH 6.5 8.5 02L SU 5.82 5.4 1 6.71 5.83 7.34 Turbidity. field N TURB -- NS NTU 7.65 8.69 9.23 7.93 4.73 Spec. Cond. (fieldl N SC NS PS1cm 319.5 303.3 429.8 165.1 807 Oxidation Reduction. Potential N ORP NS my 140.8 208.3 26.3 246.9 -20.8 GW Depth TOC N JGW DEPTH-TOCI NS ft 33.79 Notes: pg1L = micrograms per liter pS1cm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 2 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 7 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NameIID: GWA-14D GWA-14S GWA-14S GWA-15D GWA-15D GWA-1D GWA-1D Round 2 3Q-2015 Round 2 3Q-2015 Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 9/912015 9/912015 9/11/2015 613012015 9110/2015 611112015 9/812015 N N N N N N N DR-GWA-I4D-NS-3015 DR-GWA-I4S-NS-3015 DR-GWA-I4S-NS-3015 GWA-15D DR-GWA-I5D-NS-3015 GWA-10 DR-GWA-I D-NS-3015 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS uglL 100 J 100 U 74 J 100 U 4 J 100 U Aluminum T 7429-90-5 NS pqIL 100 U 58 J 660 1000 413 60 J+ Antimony D 7440-36-0 NS uglL 0.5 J 0.5 U 0.17 J 0.5 U 0,24 J 1.1 Antimony T 7440-36-0 1 IMAC NIL 0,5 U 0,5 U 0.5 U 0,5 U 0.31 J 1.3 Arsenic D 7440-38-2 NS IL 0.45 J 1.2 0.14 J 0,31 J 1 1.3 Arsenic T 7440-38-2 10 02L u IL 0.45 J 1.2 0,18 J 0.32 J 1.2 1 A Barium D 7440-39-3 NS uglL 76 58 61 52 51 68 Barium T 7440-39-3 700 021- qlL 5 U 47 67 59 62 79 Beryllium D 7440-41-7 NS u IL 0.2 U 0.2 U 0.2'J 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 0,2 U 0,2 U 0.2 U 0,084 J 0.2 U 0.2 U Boron D 7440-42-8 NS W IL 260 49 J 79 73 50 U 50 J Boron T 7440-42-8 700 02L pgIL 50 U 28 J 86 80 50 U 50 J Cadmium D 7440-43-9 NS ugIL 0:08 U 0.08 U 0:08 U 0,08 U 0.08 J 0,08 U Cadmium T 7440-43-9 2 02L pgIL 1 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0,08 U Calcium T 7440-70-2 NS IL 71600 10600 140000 1 126000 54300 34000 Chromium D 7440-47-3 NS IL 0,32 J 0,34 J 0,38 J 0.19 J 0.73 0.23 J Chromium T 7440-47-3 10 02L W IL 0.66 J+ 13.6 1.2 J+ 1.8 1.6 J+ 0.31 J Cobalt D 7440-48-4 NS pqIL 0,18 J 7.3 0,14 J 0,5 U 0.5 U 0,5 U Cobalt T 7440-48-4 1 IMAC W IL 0.32 J 3.5 0.24 J 0.61 0.3 J 0.5 U Copper D 7440-50-8 NS pgIL 0,64 J 1 U 11 0.67 J 1 U 1 U Copper T 7440-50-8 1000 02L W IL 0,25 J+ 0.69 J+ 0.76 J+ 1.8 1.1 J+ 1 UJ Iron D 7439-89-6 NS IL 1 85 4900 26 J 50 U 136 50 J Iron T 7439-89-6 300 02L g IL 50 J 3200 $40 980 719 69 J+ Lead D 7439-92-1 NS ppIL 0,11 0.1 U 0.1 U 0.12 0.1 U 0.1 U Lead T 7439-92-1 15 02L pgIL 0.14 0.1 0,33 J+ 1.3 0.29 J+ 0A U Magnesium T 7439-95-4 NS pqIL 7570 6040 18900 18400 5610 4210 Manganese D 7439-96-5 1 NS pgIL 330 7600 260 220 600 300 Manganese T 7439-96-5 I 50 02L g IL 5 uJ 2300 270 220 680 300 J+ Mercury D 7439-97-6 NS u IL 0.2 U 0.2 U 0.2 J 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L PgIL 0.2 U 0.2 U 0.2 U 0.087 J 0.2 U 0,2 U Methane N 74-82-8 NS IL 338 8A J+ 3.9 J+ 5.2 J+ 10 U 10.4 J+ Molybdenum D 7439-98-7 NS IL 13.3 2 0,93 1 2,6 3.9 Molybdenum T 7439-98-7 NS W IL 12.9 0.58 0.89 0.78 2.7 4.5 Nickel D 7440-02-0 NS IL 0,56 2,9 0,91 0.67 0,62 J+ 0,5 U Nickel T 7440-02-0 100 02L W IL 0.63 J+ 10.9 1.1 J+ 1.8 1 A J+ 0.2 J+ Potassium T 7440-09-7 NS pgIL 5000 U 2990 J 5270 7580 6280 29700 Selenium D 7782-49-2 NS IL 0.5 J 0.5 U 0.22 J 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L pgIL 0.5 U 0.5 U 0,24 J 0.5 U 0.5 U 0.5 U Sodium T 7440-23-5 NS W IL 21200 14200 26700 29800 10500 15500 Strontium D 7440-24-6 NS pgIL 1800 200 3300 3200 260 260 Strontium T 7440-24-6 NS u IL 5 J 110 3300 2800 310 310 Thallium D 7440-28-0 NS pgIL 0.1 J 0.1 U 0.1 U 01 U 0.045 J 0.1 U Thallium T 7440-28-0 0.2 IMAC IL 0.1 J 0.1 U CA J 0.024 J 0.1 U 0.1 U Vanadium D 7440-62-2 NS pgIL 1 U 1 U 0.86 J 1.2 1 U 0.38 J Vanadium T 7440-62-2 0.3 IMAC W IL 0_.62 J 0.48 J 1.5 3.2 0.79 J 0.45 J Zinc D 7440-66-6 NS pgIL 14 13 18 7.4 J 10 U 10 J Zinc T 7440-66-6 1000 02L W IL 4.3 J 5.6 J 3.8 J 4.1 J 4.8 J 10 J Total Dissolved Solids N TDS 500000 02L p IL 335000 218000 705000 618000 220000 198000 Total Organic Carbon N TCC NS IL 1000 J 1500 540 J 560 J 1000 J 690 J Total Suspended Solids N TSS NS pgIL 46900 4900 42900 13400 33000 2500 U Alkalinity, CO3 N ALK-0O3 NS u IL 5000 U 5000 U 5000 U 5000 U 10000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS L 130000 77900 129000 94500 160000 126000 Alkalinity, lab N ALK-LAB NS IL 130000 77900 129000 94500 160000 126000 Chloride N 16887-00-6 250000 02L pgIL 13100 7500 13300 12700 1500 1700 Nitrite as N N 14797-65-0 1000 02L W IL Nitrogen, NO2 plus NO3 N NO2-NO3 NS IL 20 U 20 U 20 UJ 21 20 U 20 U Sulfate N 14808-79-8 250000 02L g IL 90800 25700 307000 301000 4200 5400 Sulfide N 19496-25-8 NS pgIL 100 U 100 U 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS IL As V T 10103-60-3 NS IL Chromium VI T 18540-29-9 0.07 DHHS W IL Fe II T 1345-25-1 NS pgIL Fe(Ill) T 1309-37-1 NS W IL Mn II T 1344-43-0 NS L Mn(IV) T 1313-13-9 NS pgIL Se IV T 10102-18-8 NS IL Se l T 1341MI-0 NS JgIL Uranium, Natural T 7440-61-1 NS pcjtL Page 3 of 12 Table 2-9 Groundwater Results Downgrad-sent of the Ash Basin and Ash Storage Areas - Round 7 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name1ID: GWA-14D GWA-14S GWA-14S GWA-15D GWA-15D GWA-1D GWA-1D Round 2 3Q-2015 Round 2 3Q-2015 Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 9/912015 9/912015 9/11/2015 613012015 9110/2015 611112015 9/812015 N N N N N N N DR-GWA-I4D-NS-3015 DR-GWA-I4S-NS-3015 DR-GWA-I4S-NS-3015 GWA-15D DR-GWA-I5D-NS-3015 GWA-10 ❑R-GWA-ID-NS-3015 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCiIL Radium-228 T 15262-20-1 NS Ci1L Uranium-233 T 13968-55-3 NS u IL. Uranium-234 T 13966--29-5 NS pg1L Uranium-236 T 13982-70-2 NS /L Dissolved Oxygen N DO NS m L 0,18 1.75 0.71 0.3 0,54 0.3 Temp Celsius N TEMP NS Deg C 29.9 26 20.6 21.2 19.7 18.7 H (field) N PH 6.5 8.5 02L Su 7.1 5.9 7.09 6.8 7.5 9.1 Turbidity. field N TURB -- NS NTU 3.17 2.92 4,52 8.9 18,83 8.2 Spec. Cond. field N SC NS s1cm 508 173.7 1576 873 389.2 287.9 Oxidation Reduction. Potential N oRP NS my -45.5 61 A 156 84.8 -4.1 -78.8 GW Depth TOC N GW DEPTH -TO NS I ft 6,32 9.8 23.34 33,05 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCiIL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 4 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 7 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Namefle: GWA-1S GWA-IS GWA-2D GWA-2D GWA-2S GWA-2S GWA-3D Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 611712015 919/2015 6/10/2015 91812015 6/11/2015 9/4/2015 61412015 N N N N N N N GWA-1S DR-GWA-IS,NS•3015 GWA-2D DR-GWA-2D-NS-3015 GWA-2S DR-GWA-2S-NS-3015 GWA-3D Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS uglL 100 U 100 U 5.8 J 100 U 3.4 J 100 U 9 Aluminum T 7429-90-5 NS pqIL 920 110 90.9 310 806 1100 J+ 350 Antimony D 7440-36-0 NS uglL 0.37 J 0.9 0.55 0.25 J 0.5 U 1 U Antimony T 7440-36-0 1 IMAC NIL 0.5 UJ 0,95 2.2 0,55 0.5 U 0,5 U 1 U Arsenic D 7440-38-2 NS IL 0.5 U 0.5 U 1.1 1.5 0.5 U 1 U Arsenic T 7440-38-2 10 02L p IL 0.18 J 0.5 U 1.3 1.7 0.14 J 0,39 J 1 U Barium D 7440-39-3 NS uglL 6,2 7.7 40 41 18 17 9 Barium T 7440-39-3 700 021- qlL 12 8.6 56 46 26 27 13 Beryllium D 7440-41-7 NS u IL 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 1 U Beryllium T 7440-41-7 4 IMAC p IL 0.094 J 0.2 U 0,2 U 0.2 U 0,078 J 0,13 J 1 U Boron D 7440-42-8 NS W IL 50 U 50 U 50 U 50 U 50 U 50 U 50 U Boron T 7440-42-8 700 02L pgIL 50 U 50 U 50 U 50 U 50 U 50 U 50 U Cadmium D 7440-43-9 NS ugIL 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 1 U Cadmium T 7440-43-9 2 02L pgIL 1 0,08 U 0.08 U 0,08 U 0,08 U 0.08 U 0,08 U 1 U Calcium T 7440-70-2 NS IL 3450 2320 58200 43200 2690 2940 10800 Chromium D 7440-47-3 NS IL 2.2 J+ 0,48 J 4.3 17 1A 12.3 Chromium T 7440-47-3 10 02L W IL 1318 1.6 J+ 5.7 6.3 2.6 4.7 17.7 Cobalt D 7440-48-4 NS pgIL 2.4 1,5 0,5 U 0.5 U 1,9 1 U Cobalt T 7440-48-4 1 IMAC W IL 3 1.5 0.5 U 0,3 J 2.3 1.4 J+ 1.02 Copper D 7440-50-8 NS I PqIL 0.76 J+ 2.4 0,49 J 6A 0.31 J+ 1.03 J+ Copper T 7440-50-8 1000 02L W IL 3 J+ 0.5 J 0.54 J 0.86 J+ 0.92 J 2.3 2.99 Iron D 7439-89-6 NS IL 50 U 50 U 50 U 50 U 50 U 120 101 Iron T 7439-89-6 300 02L g IL 1200 170 86.7 230 909 1600 J+ 411 Lead D 7439-92-1 NS ppIL 0.1 U 0,27 0.1 U 036 01 U 1 U Lead T 7439-92-1 15 02L pgIL 0.51 0.069 J 0.23 0.34 0.4 J+ 1.2 1.5 Magnesium T 7439-95-4 NS pqIL 3470 1790 3860 6700 1290 1190 8090 Manganese D 7439-96-5 1 NS pgIL 100 71 5 U 280 88 81 107 Manganese T 7439-96-5 I 50 02L g IL 120 74 25 280 94 46 J+ 122 Mercury D 7439-97-6 NS u IL 0.2 UJ 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.05 U Mercury T 7439-97-6 1 02L IL 0,11 J+ 0.2 U 0,79 J+ 0.2 U 02 U 0.2 U 0.05 U Methane N 74-82-8 NS IL 10 U 2.1 J+ 10 U 3.6 J+ 10 U 2.5 J+ 10 U Molybdenum D 7439-98-7 NS IL 0.11 J 0.5 U 3.3 1.7 0.12 J 1.01 Molybdenum T 7439-98-7 NS W IL 0.3 J 0.14 J 3.9 2.2 0.11 J 0.19 J 1.28 Nickel D 7440-02-0 NS IL 8.2 2,1 0,31 J 0,46 J 3,8 12.5 Nickel T 7440-02-0 100 02L W IL 10.3 2.3 0,47 J 1.2 J+ 4.5 J+ 4.3 16.9 Potassium T 7440-09-7 NS pgIL 5000 U 5000 U 5560 5000 U 5000 U 5000 U 796 Selenium D 7782-49-2 NS IL 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 1 U Selenium T 7782-49-2 20 02L pgIL 0,5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 1 U Sodium T 7440-23-5 NS W IL 18400 15000 11400 9490 3750 J 3390 J 24900 Strontium D 7440-24-6 NS pgIL 53 35 210 260 25 23 155 Strontium T 7440-24-6 NS u IL 59 36 250 270 26 24 162 Thallium D 7440-28-0 NS pgIL 0.1 U 0,1 U 0.1 U 0.1 U 0.1 U 0.2 U Thallium T 7440-28-0 0.2 IMAC IL 0.016 J 0.1 U 0.032 J 0.1 U 0,016 J 0,031 J 0.2 U Vanadium D 7440-62-2 NS I PgIL 1 U 1 U 0.5 J 0.33 J 1 U 0.3 U Vanadium T 7440-62-2 0.3 IMAC W IL 1.5 0.39 J 0.57 J 0.65 J 1.3 4.1 0.3 U Zinc D 7440-66-6 NS pgIL 1 3.5 J 22 10 U 10 U 6,6 J 9,1 J+ 19 Zinc T 7440-66-6 1000 02L W IL 9.6 J+ 27 3.1 J+ 2.8 J 8.7 J 7 J 16 J+ Total Dissolved Solids N TDS 500000 02L p IL 105000 56000 J 10000 U 198000 37000 96000 J+ 160000 Total Organic Carbon N TCC NS IL 1900 1100 780 J 520 J 9300 960 J 412 J+ Total Suspended Solids N TSS NS pgIL 25000 2700 200000 97200 17000 58000 15000 Alkalinity, CO3 N ALK-0O3 NS u IL 10000 U 5000 U 18000 5000 U 10000 U 5000 U 10000 U Alkalinity, HCO3 N ALK-HCO3 NS L 37000 18700 29000 128000 16000 13600 75000 Alkalinity, lab N ALK-LAB NS IL 37000 18700 51000 128000 16000 13600 75000 Chloride N 16887-00-6 250000 02L pgIL 3600 J+ 4200 5000 4100 1800 1700 22000 Nitrite as N N 14797-65-0 1000 02L W IL 57 Nitrogen, NO2 plus NO3 N NO2-NO3 NS IL 20 U 37 34 20 UJ 160 J+ 190 Sulfate N 14808-79-8 250000 02L g IL 15100 J+ 15100 3100 3700 640 J 1000 6200 Sulfide N 18496-25-8 NS pgIL 200 U 100 U 100 U 100 U 100 U 100 U 500 U As(III) T 7784-46-5 NS IL As V T 10103-60-3 NS IL Chromium VI T 18540-29-9 0.07 DHHS W IL Fe(II) T 1345-25-1 NS pgIL Fe(Ill) T 1309-37-1 NS W IL Mn II T 1344-43-0 NS L Mn(IV) T 1313-13-9 NS IL Se IV T 10102-18-8 NS IL Se l T 1341MI-0 NS Pq,I Uranium, Natural T 7440-61-1 NS IL Page 5 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 7 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Namefl0: GWA-15 GWAAS GWA-2D GWA-2D GWA-2S GWA-2S GWA-3D Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 611712015 919/2015 6/10/2015 91812015 6/11/2015 9/4/2015 61412015 N N N N N N N GWA-1S DR-GWA-IS,NS•3015 GWA-2D DR-GWA-2D-NS-3015 GWA-2S DR-GWA-2S-NS-3015 GWA-3D Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCiIL Radium-228 T 15262-20-1 NS Ci1L Uranium-233 T 13968-55-3 NS u 1L. Uranium-234 T 13966--29-5 NS pg1L Uranium-236 T 13982-70-2 NS /L ❑ ssolved Oxygen N DO NS m L 49.6 2.9 1 0.33 3,8 2.7 Temp Celsius N TEMP NS Deg C 23.8 19.7 31 A 28.5 35.9 18.5 H((field) N PH 6.5 8.5 02L SU 5.97 5.7 8.98 7A4 5.74 5.7 Turbidity. field N TURB -- NS NTU 26.12 9.7 26:09 14.98 8.13 7.58 Spec. Cond. field N SC NS ps1cm 105 111.2 187.2 346.5 50.1 244.7 Oxidation Reduction. Potential N ORP NS my 296.E 5.6 177 120.5 293.4 246.2 GW Depth TOC N JGW DEPTH -TO NS ft 32.9 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCiIL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 6 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: GWA-3D GWA-3S GWA-3S GWA-4D GWA-4D GWA-4S GWA-4S Round 2 3Q-2015 Round 1 (CSA sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 91412015 6/4/2015 914/2015 6/23/2015 91912015 6/1912015 9110/2015 N N N N N N N DR-GWA-3D-NS-3Q15 GWA-3S DR-GWA-3S-NS-3015 GWA-4D DR-GWA-4D-NS-3Q15 GWA-4S DR-GWA-4S-NS-3015 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS uglL 100 U 17 100 U 100 U 100 U 100 U 100 U Aluminum T 7429-90-5 NS pqIL 170 236 190 J'+ 430 360 380 1700 Antimony D 7440-36-0 NS uglL 0.5 J 1 U 0.5 U 0.23 J 0.5 U 0.5 U 0.5 U Antimony T 7440-36-0 1 IMAC NIL 0,66 1 U 0,5 U 0,49 J 0,5 U 0,5 U 0.5 U Arsenic D 7440-38-2 NS IL 0.5 U 1 U 0.5 U 0.39 J 0.2 J 0.18 J 0.23 J Arsenic T 7440-38-2 10 02L u IL 0,16 J 1 U 0,11 J 0,37 J 0,5 U 0.2 J 0,39 J Barium D 7440-39-3 NS uglL 6 45 38 20 26 27 39 Barium T 7440-39-3 700 021- qlL 9.3 49 34 26 31 32 60 Beryllium D 7440-41-7 NS u IL 0.2 U 1 U 0.2 0.1 J 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 0,069 J 1 U 0.1 J 0,2 U 0,2 U 0,2 U 0,16 J Boron D 7440-42-8 NS W IL 27 J 50 U 50 U 240 250 200 J+ 250 Boron T 7440-42-8 700 02L pgIL 26 J 50 U 50 U 250 250 190 250 Cadmium D 7440-43-9 NS uglL 0.062 J 1 U 0.037 J 0.032 J 0,08 U 0.08 U 0.08 U Cadmium T 7440-43-9 2 02L pgIL 0,08 1 U 0,039 J 0,08 U 0,08 U 0,08 U 0,08 U Calcium T 7440-70-2 NS IL 11000 5830 2050 26500 20900 19500 19300 Chromium D 7440-47-3 NS IL 17.4 1 U 11 0,53 0.36 J 0.81 7 Chromium T 7440-47-3 10 02L W IL 39.7 1 U 4.2 1.2 J+ IA J+ 3.2 35.2 Cobalt D 7440-48-4 NS pgIL 0.91 11.3 17.6 0,17 J 0.29 J 2.7 2.5 Cobalt T 7440-48-4 1 IMAC W IL 1.1 12.2 10.8 0.35 J 0.54 2.7 3.8 Copper D 7440-50-8 NS pgIL 2.6 J+ 1 UJ 3,2 0,41 J 1 J 1 U 0.67 J Copper T 7440-50-8 loco 02L W IL 1.8 J+ 8.6 1.1 1.4 J'+ 0." J 0,58 J 3.7 Iron D 7439-89-6 NS IL 220 14 50 U 50 U 29 J 50 U 150 Iron T 7439-89-6 300 02L g IL 460 190 220 J+ 370 J+ 330 530 2400 Lead D 7439-92-1 NS ppIL 0.27 1 U 0,28 0.1 U 0.12 0.1 U 0.067 J Lead T 7439-92-1 15 02L pgIL 0.8 1 U 0.2 0.45 J+ 0.53 0.29 1.7 Magnesium T 7439-95-4 NS pqIL 9140 4990 1920 6890 7530 5970 5940 Manganese D 7439-96-5 1 NS pgIL 76 480 380 23 70 560 510 Manganese T 7439-96-5 1 50 02L g IL 89 533 300 J+ 33 90 590 540 Mercury D 7439-97-6 NS u IL 0.2 U 0.05 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L I pgIl- 0.2 U 0.05 U 0.2 U 0.2 U 0,2 U 0,2 U 0.2 U Methane N 74-82-8 NS IL 2 J+ l0 U 1.8 J+ 12.7 J+ 115 82 529 Molybdenum D 7439-98-7 NS IL 0,56 1 U 0,5 U 0,54 J+ 0.15 1 11.9 12.8 Molybdenum T 7439-98-7 NS W IL 1.2 1 U 0.5 U 0.64 0.15 J 11.6 15.2 Nickel D 7440-02-0 NS IL 28A 8.27 9 0,68 0.94 4.5 21 Nickel T 7440-02-0 100 02L W IL 34.4 8.7 9 0.91 J+ 1.3 4.5 23A Potassium T 7440-09-7 NS pgIL 5000 U 2570 2700 J 5000 U 5000 U 4320 J 4390 J Selenium D 7782-49-2 NS IL 0.5 U 1 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L pgIL 0.5 U 1 U 0,5 U 0,5 U 0,5 U 0,5 U 0.5 U Sodium T 7440-23-5 NS W IL 21100 11300 7040 17400 18600 17200 16600 Strontium D 7440-24-6 NS pgIL 160 84 53 310 290 290 340 Strontium T 7440-24-6 NS u IL 180 108 42 340 280 300 330 Thallium D 7440-28-0 NS pgIL 0.1 U 0.2 U 0,1 U 0.1 U 0.1 U 0,1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC IL 0.1 U 0.2 U 0.1 U 0.1 U 0.1 U 0.1 U 0.044 J Vanadium D 7440-62-2 NS pgIL 1 U 0.3 U 1 U 0.95 J 1 U 1 U 1 U Vanadium T 7440-62-2 0.3 IMAC W IL _ 0.6 J_ 0.3 U 0.56 J 1.5 0.53 J 0.6 J 4.3 Zinc D 7440-66-6 NS pgIL 29 27 21 J+ 10 U 9.8 J 2.6 J 4,6 J Zinc T 7440-66-6 1000 02L W IL 20 20 J+ 11 5.9 J+ 3A J 3A J 8.5 J Total Dissolved Solids N TDS 500000 02L p IL 196000 J+ 110000 83000 J+ 188000 171000 152000 157000 Total Organic Carbon N TCC NS IL 1000 U 588 J+ 2000 U 14000 1000 UJ 650 J 1000 U Total Suspended Solids N TSS NS pgIL 24400 5000 U 2700 U 102000 63000 68100 601000 Alkalinity, CO3 N ALK-0O3 NS u IL 5000 U 10000 U 5000 U 5000 U 5000 U 1 5000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS L 73000 67000 19900 64700 47200 1 58800 63500 Alkalinity, lab N ALK-LAB NS IL 73000 J- 67000 19900 64700 47200 1 58800 63500 Chloride N 16887-00-6 250000 02L pgIL 21700 11000 4500 14200 13300 1 11400 11100 Nitrite as N N 14797-65-0 1000 02L W IL 31 Nitrogen, NO2 plus NO3 N NO2-NO3 NS IL 62 J- 30 20 U 20 U 20 U 20 U Sulfate N 14808-79-8 250000 02L g IL 3900 73000 1800 47800 42700 38200 28700 Sulfide N 18496-25-8 NS pgIL 100 U 100 U 100 U 100 U 100 U 100 U 100 UJ As(III) T 7784-46-5 NS IL As V T 10103-60-3 NS IL Chromium VI T 18540-29-9 0.07 DHHS W IL Fe II T 1345-25-1 NS pgIL Fe(Ill) T 1309-37-1 NS W IL Mn II T 1344-43-0 NS L Mn(IV) T 1313-13-9 NS IL IV T 10102-18-8 NS IL rSe Se l T 1341MI-0 NS pgIL Uranium, Natural T 7440-61-1 NS IL Page 7 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: GWA-3D GWA-3S GWA-3S GWA-4D GWA-4D GWA-4S GWA-4S Round 2 3Q-2015 Round 1 (CSA sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 91412015 6/4/2015 914/2015 6/23/2015 91912015 611912015 9110/2015 N N N N N N N DR-GWA-3D-NS-3Q15 GWA-3S DR-GWA-3S-NS-3015 GWA-4D DR-GWA-4D-NS-3Q15 GWA-4S DR-GWA-4S-NS-3015 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCiIL Radium-228 T 15262-20-1 NS Ci1L Uranium-233 T 13968-55-3 NS u IL. Uranium-234 T 13966--29-5 NS pg1L Uranium-236 T 13982-70-2 NS /L Dissolved Oxygen N DO NS m L 5,47 1,49 0,18 0.51 Temp Celsius N TEMP NS Deg C 19.1 22.6 27.1 23.9 H((field) N PH 6.5 8.5 02L SU 5.51 6.9 6.3 6.39 Turbidity. field N TURB -- NS NTU 7,42 7.01 14.6 35.84 Spec. Cond. field N SC NS ps1cm 141.7 281.9 256,9 189.E Oxidation Reduction. Potential N ORP NS my 303.7 180.E 51.9 60.8 GW Depth TOC N JGW DEPTH -TO NS ft Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCiIL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 8 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Namefl0: GWA-58R GWA-58R GWA-60 GWA-6D GWA-6S GWA-6S MW-21D Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 611612015 9/912015 6/2912015 9/11/2015 6130/2015 9112/2015 6/23/2015 N N N N N N N GWA-58R DR-GWA-5BR-NS-3015 GWA-6D DR-GWA-6D-NS-3015 GWA-6S DR-GWA-6S-NS-3015 MW-21D Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS uglL 5.8 J 100 U 100 U 100 U 100 U 100 U 100 U Aluminum T 7429-90-5 NS pqIL 187 65 J 120 100 U 1300 220 100 U Antimony D 7440-36-0 NS uglL 0.5 U 0.5 U 0.5 U 0.17 J 2.5 U 0.5 U 0.5 U Antimony T 7440-36-0 1 IMAC NIL 0.5 U 0,5 U 0.5 U 0,18 J 2.5 U 0.5 U 0.5 U Arsenic D 7440-38-2 NS IL 0,85 0.31 J 0.98 0.96 2.4 J 3.1 0.41 J+ Arsenic T 7440-38-2 10 02L p IL 0,83 0,19 J 0.96 0,79 2,2 J 2.9 0,21 J Barium D 7440-39-3 NS uglL 73 64 33 42 200 210 34 Barium T 7440-39-3 700 021- qIL 75 65 35 43 210 220 42 Beryllium D 7440-41-7 NS u IL 0.2 U 0.2 U 0.2 U 0.2 U 1 U 0.2 U 0.33 Beryllium T 7440-41-7 4 IMAC p IL 0,2 U 0.2 U 0,2 U 0,2 U 1 U 0.2 U 0.2 U Boron D 7440-42-8 NS W IL 190 190 630 620 620 710 210 Boron T 7440-42-8 700 02L pgIL 190 J+ 190 610 600 1 610 700 210 Cadmium D 7440-43-9 NS uglL 0.08 U 0,08 U 0.08 U 0.08 U 0.4 U 0.08 U 0,07 J Cadmium T 7440-43-9 2 02L PqIL 0,08 U 0.08 U 0,08 U 0,08 U 0,4 U 0,08 U 0,08 U Calcium T 7440-70-2 NS IL 188000 174000 50500 45500 81100 83000 136000 Chromium D 7440-47-3 NS IL 0.27 J+ 0,52 0,22 J 0,42 J 0,9 J 0,45 J 0.39 J+ Chromium T 7440-47-3 10 02L W IL 0.5 UJ 0.7 J+ 1.1 J+ 0.68 J+ 3.6 0.75 J+ 0.31 J+ Cobalt D 7440-48-4 NS pgIL 0,26 J 0.5 U 0,45 J 0,54 2.5 U 1,6 0.5 U Cobalt T 7440-48-4 1 IMAC W IL 0.32 J 0.5 U 0.51 0.51 1.3 J 1.8 0.5 U Copper D 7440-50-8 NS pgIL 1 UJ 1 U 0,32 J 0.64 J 5 U 0.29 J 4.5 J+ Copper T 7440-50-8 loco 02L W IL 1 UJ 1 U 1 UJ 1 U 3.2 J 0,39 J 1.5 J+ Iron D 7439-89-6 NS IL 210 190 7400 6700 25300 13600 690 Iron T 7439-89-6 300 02L g IL 307 260 7400 6700 21200 15200 550 Lead D 7439-92-1 NS ppIL 0,1 UJ 0.1 U 0.1 U 0,15 0.5 U 0.1 U 0,73 J+ Lead T 7439-92-1 15 02L pgIL 0.098 J+ 0.1 U 0,18 J+ 0.073 J 1.7 0.077 J 0.76 Magnesium T 7439-95-4 NS pqIL 25900 27900 10400 10900 14100 12500 19100 Manganese D 7439-96-5 1 NS pgIL 620 630 1300 1200 3900 3700 940 Manganese T 7439-96-5 I 50 02L g IL 630 650 1300 1200 3700 3800 920 Mercury D 7439-97-6 NS u IL 0.2 UJ 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L IL 0,2 UJ 0.2 U 0,2 U 0,2 U 0,2 U 02 U 0,2 U Methane N 74-82-8 NS IL 17 16.9 J+ 3080 2920 744 J 2740 16.9 J+ Molybdenum D 7439-98-7 NS IL 0,44 J 0,22 J 3.3 5A 13.7 8.6 0.34 J+ Molybdenum T 7439-98-7 NS W IL 0.55 0.23 J 3 5.2 9.2 8 0,31 J Nickel D 7440-02-0 NS IL 1 J+ 0,82 2.2 2 1.4 J 1,8 0.75 J+ Nickel T 7440-02-0 100 02L W IL 1.1 J+ 0.85 2.1 J+ 1.9 2.9 1.9 0.58 J+ Potassium T 7440-09-7 NS pgIL 5000 U 5000 U 5000 U 5000 U 12000 10700 5000 U Selenium D 7782-49-2 NS IL 0.5 U 0.5 U 0.5 U 0.5 U 2.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L pgIL 0,5 U 0,5 U 0.5 U 0.5 U 2,5 U 0,5 U 0.5 U Sodium T 7440-23-5 NS W IL 29600 21000 28200 27000 24700 26200 15800 Strontium D 7440-24-6 NS pgIL 2300 2100 190 190 860 680 810 Strontium T 7440-24-6 NS u IL 2300 2100 200 200 850 710 960 Thallium D 7440-28-0 NS pgIL 0,1 UJ 0.1 U 0.1 U R1 U 0.14 J 0.1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC IL 0.1 UJ 0.1 U 0.1 U 0.1 UJ 0.5 U 0.1 UJ 0.1 U Vanadium D 7440-62-2 NS pgIL 1 U 1 U 1 U 1 U 5 U 1.2 1 U Vanadium T 7440-62-2 0.3 IMAC W IL 0.49 J_ 1 U 1 U 1 U 6.5 1.1 1 U Zinc D 7440-66-6 NS pgIL 23 6,6 J 10 U 5.7 J 2.7 J 13 32 J+ Zinc T 7440-66-6 1000 02L W IL 6.6 J 10 U 10 UJ 6.4 J 27 J+ 4.8 J 10 U Total Dissolved Solids N TDS 500000 02L p IL 873000 799000 302000 293000 432000 340000 639000 Total Organic Carbon N TCC NS IL 26800 1000 UJ 1400 23200 34800 7800 1000 U Total Suspended Solids N TSS NS pgIL 10700 2900 15000 6200 67000 371000 3500 Alkalinity, CO3 N ALK-0O3 NS u IL 10000 U 5000 U 5000 U 5000 U 5000 U 5000 UJ 5000 U Alkalinity, HCO3 N ALK-HCO3 NS L 150000 154000 124000 92100 290000 317000 161000 Alkalinity, lab N ALK-LAB NS IL 150000 154000 124000 J+ 92100 290000 317000 161000 Chloride N 16887-00-6 250000 02L pgIL 17500 18200 16300 18300 18500 18900 17700 Nitrite as N N 14797-65-0 1000 02L W IL Nitrogen, NO2 plus NO3 N NO2-NO3 NS PgIL 20 U 20 U 22 J+ 20 UJ 20 U 16 J- 20 U Sulfate N 14808-79-8 250000 02L g IL 416000 362000 88700 97700 10900 2300 274000 Sulfide N 18496-25-8 NS pgIL 100 U 100 U 100 UJ 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS IL As V T 10103-60-3 NS IL Chromium VI T 18540-29-9 0.07 DHHS W IL Fe II T 1345-25-1 NS pgIL Fe(Ill) T 1309-37-1 NS W IL Mn II T 1344-43-0 NS L Mn(IV) T 1313-13-9 NS IL Se IV T 10102-18-8 NS IL Se l T 1341MI-0 NS pgIL Uranium, Natural T 7440-61-1 NS IL Page 9 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Namefl0: GWA-5614 GWA-58R GWA-60 GWA-6D GWA-6S GWA-6S MW-21D Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 611612015 9/912015 6/2912015 9/11/2015 6130/2015 9112/2015 6/23/2015 N N N N N N N GWA-58R DR-GWA-5BR-NS-3015 GWA-6D DR-GWA-6D-NS-3015 GWA-6S DR-GWA-6S-NS-3015 MW-21D Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCiIL Radium-228 T 15262-20-1 NS Ci1L Uranium-233 T 13968-55-3 NS u 1L. Uranium-234 T 13966--29-5 NS pg1L Uranium-236 T 13982-70-2 NS /L ❑ ssolved Oxygen N DO NS m L 0,42 0,35 18 0.3 0.2 0.34 Temp Celsius N TEMP NS Deg C 23.7 22.4 18.6 20.5 21.1 23.4 H((field) N PH 6.5 8.5 02L Su 6,99 7,08 6.58 6.5 6.8 7.03 Turbidity. field N TURB -- NS NTU 3.75 0.55 5.61 5.5 140.2 8.22 Spec. Cond. (fieldl N SC NS s1cm 1074 1074 460 446.6 687 855 Oxidation Reduction. Potential N ORP NS my 47.2 -76 4.6 -34.7 -92.1 87,5 GW Depth TOC N JGW DEPTH-TOCJ NS ft 18.85 19,7 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCiIL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 10 of 12 Table 2-9 Groundwater Results Qowngradient of the Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NamellD: Mw-21D Mw-21D MW-21$ MW-21S Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 612412015 911012015 6124/2015 911012015 N N N N Mw-210 DR-MW-2ID-NS-3Q15 MW-21S DR-Mw-21S-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS uglL 100 U 100 U 100 U Aluminum T 7429-90-5 NS pqIL 250 100 U 94 J Antimony D 7440-36-0 NS uglL 0.5 U 0.3 J 0.18 J Antimony T 7440-36-0 1 IMAC NIL 0.5 U 0,29 J 0.5 U Arsenic D 7440-38-2 NS IL 0.12 J 16.9 34.2 Arsenic T 7440-38-2 10 02L p IL 0,17 J 16.8 42.8 Barium D 7440-39-3 NS uglL 38 33 40 Barium T 7440-39-3 700 021- qlL 40 38 45 Beryllium D 7440-41-7 NS u IL 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 0.2 U 0,2 U 0.2 U Boron D 7440-42-8 NS W IL 210 180 250 Boron T 7440-42-8 700 02L pgIL 210 190 260 Cadmium D 7440-43-9 NS uglL 0.08 U 0.03 J 0,08 U Cadmium T 7440-43-9 2 02L pgIL 0.08 U 0,08 U 0.08 U Calcium T 7440-70-2 NS IL 144000 22000 23400 Chromium D 7440-47-3 NS IL 0,19 J 0.22 J+ 0,5 U Chromium T 7440-47-3 10 02L W IL 0.92 0.28 J+ 0.34 J Cobalt D 7440-48-4 NS pgIL 0.5 U 0,72 1.1 Cobalt T 7440-48-4 1 IMAC W IL 0.5 U 0.79 1.5 Copper D 7440-50-8 NS pgIL 18 1 UJ 0,27 J Copper T 7440-50-8 loco 02L W IL 1.2 1 UJ 1 U Iron D 7439-89-6 NS IL 160 50 U 50 U Iron T 7439-89-6 300 02L g IL 440 50 U 120 Lead D 7439-92-1 NS ppIL 0,25 0,1 UJ 0.1 U Lead T 7439-92-1 15 02L pgIL 0.45 0.1 U 0.088 J Magnesium T 7439-95-4 NS PqIL 19900 5420 6160 Manganese D 7439-96-5 1 NS pgIL 870 640 740 Manganese T 7439-96-5 I 50 02L g IL 850 670 760 Mercury D 7439-97-6 NS u IL 0.2 U 02 U 02 U Mercury T 7439-97-6 1 02L IL 0.2 U 0,2 U 0.2 U Methane N 74-82-8 NS IL 35.8 J 8.5 J+ 764 J Molybdenum D 7439-98-7 NS IL 0,32 J 20.7 197 Molybdenum T 7439-98-7 NS W IL 0.3 J 19.9 24.3 Nickel D 7440-02-0 NS IL 0,6 1.2 J+ 1.2 Nickel T 7440-02-0 100 02L W IL 1 1.1 J+ 1.6 Potassium T 7440-09-7 NS pgIL 5000 U 4080 J 4880 J Selenium D 7782-49-2 NS IL 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L pgIL 0,5 U 0,5 U 0,5 U Sodium T 7440-23-5 NS W IL 18300 12900 15600 Strontium D 7440-24-6 NS pgIL 950 320 420 Strontium T 7440-24-6 NS u IL 890 370 420 Thallium D 7440-28-0 NS pgIL 0.1 U 0.1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC IL 0.1 U 0.1 U 0.1 U Vanadium D 7440-62-2 NS pgIL 1 U 1.6 0.41 J Vanadium T 7440-62-2 0.3 IMAC W IL 0.72 J_ 1.5 0.76 J Zinc D 7440-66-6 NS pgIL 10 U 10 UJ 10 U Zinc T 7440-66-6 1000 02L W IL 2.9 J 10 UJ 2.9 J Total Dissolved Solids N TDS 500000 02L p IL 599000 137000 151000 Total Organic Carbon N TCC NS IL 1000 U 1000 U 650 J Total Suspended Solids N TSS NS pgIL 4700 5000 U 4000 Alkalinity, CO3 N ALK-0O3 NS u IL 5000 U 5000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS L 152000 58200 76900 Alkalinity, lab N ALK-LAB NS IL 152000 58200 76900 Chloride N 16887-00-6 250000 02L pgIL 17900 11200 11700 Nitrite as N N 14797-65-0 1000 02L W IL Nitrogen, NO2 plus NO3 N NO2-NO3 NS PgIL 20 U 20 UJ 20 U Sulfate N 14808-79-8 250000 02L g IL 269000 37000 23200 Sulfide N 18496-25-8 NS pgIL 100 U 100 U 100 U As(III) T 7784-46-5 NS IL 0.2 U 1.04 As V T 10103-60-3 NS IL 0,2 U 17,9 Chromium VI T 18540-29-9 0.07 DHHS W IL 0.0103303103000000 0.029 J+ Fe II T 1345-25-1 NS pgIL 192 20 U Fe(Ill) T 1309-37-1 NS W IL 431 7.1 Mn II T 1344-43-0 NS L 1020 645 Mn(IV) T 1313-13-9 NS IL 17.44583628380 24.6 Se IV T 10102-18-8 NS IL 0.5 u 0.5 U Se l T 1341MI-0 NS pgIL 0.5 U 0.5 U Uranium, Natural T 7440-61-1 NS IL Page 11 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 7 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NameflD: MW-210 MW-21D MW-21S Mw-21S Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 301-2015 612412015 9/1012015 612412015 9/1012015 N N N N MW-210 DR-MW-2ID-NS-3Q15 MW-21S DR-Mw-21S-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCi1L Radium-228 T 15262-20-1 NS CifL Uranium-233 T 13968-55-3 NS /L. Uranium-234 T 13966-29-5 NS IL Uranium-236 T 13982-70-2 NS IL Dissolved Oxygen N DO NS m IL 0,47 0.5 Temp Celcius N TEMP NS Deg, C 18.5 19.2 pH (field) N PH 6.5 8.5 02L SU 7.11 6,69 Turbidity, field N TURB -- NS NTU 8.6 5.1 Spec. Cond. (fieldl SC NS ps1cm 820 250 Oxidation Reduction Potential N ORP NS my -12 140 GW Depth TOC N JGW DEPTH -TO NS I I ft 3.9 5,18 Notes: pg1L = micrograms per liter µS1cm = microsiemens per centimeter ft = feet mV = millivolts NTU - nephelometrlc turbidity units pCi11L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 12 of 12 Table 2-10 Constituents of Interest Evaluation Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Criteria Source: Turbidity,._ 02L 11 02L I 50 02L 0,07 DHHS IMAC 1 02L 4 IMAC Boron 700 02L 10 02L .bManganese 1 IMAC 300 02L 50 02L 20 1 PPBC (Minimum (for ranges)): I SCREENING 1 • ®®® • 1 ��®®®��® Result Flagi' �� • • • ��r�a��a��s��®��_�� .:. , , �� , _era Page 1 of 6 Table 2-10 Constituents of Interest Evaluation Corrective Action Pan Part 2 Dan River Steam Station Ash Basin NC GW Criteria; Turbidity,pH 83 Iron 11 Manganese. I 50 0,07 1 4 Boron 1 700 10 ...Manganese 1 300 15 50 20 PPBC (Minimum (for ranges)):, SCREENING ONO •�®��®�a�a_��a�a-a��_�'®®a_ . , I _ate �a� .•�®��s�aa�a�a�a�a�a_a_a�a� ., I �a��a�� Page 2 of 6 Table 2-10 Constituents of Interest Evaluation Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Constituent: Fraction: Unit: NC GW Criteria: Criteria Source: Turbidity, field N NTU - - pH N SU 8.5 02L Iron T pglL 300 02L Manganese T pglL 50 02L Chromium (VI) T pglL 0,07 DHHS Antimony T pglL 1 IMAC Arsenic T pglL 10 02L Beryllium T pglL 4 1MAC Boron T NgIL 700 02L Chromium T pglL 10 02L Cobalt T pglL 1 IMAC Iran T pglL 300 02L Lead T pg/L 15 02L Manganese T pglL 50 02L Selenium T pg L 20 02L PPBC (Minimum (for ranges)): PPBC: SCREENING ONLY 10 6.65 6.78 - lit - 63 - 0.09 - 1 - 1 - 0.21 - 50 - 5 - 0.5 - 10 - 10 - 63 - 1 Well matrix Event date Result Flag Result Flag Result Flag Result Flag Result Flag Result Flag Result Flag 1 Result Flag 1 Result Flag I Result Flag I Result Flag I Result Flag I Result Flag Result Flag Result Fla MW-308BR WG Round 2 919/2015 6.2 9.3 5300 5400 MW-310BR WG Round 1 6116120115 9.92 377 110 MW-310BR WG Round 2 919/2015 9.1 8.8 410 MW-311BR WG Round 1 6/29/2015 39.18 - - - - 1200 580 MW-311BR WG Round 2 9/1112015 20.6 - - 810 1100 540 MW-314SR lWG Round 1 6/25/2015 7.63 - 380 - MW-314BR WG Round 2 9/11/2015 8.35 - - 1.6 65 - MW-315BR WG Round 1 WIW2015 13.34 - - - - 24.8 2.2 1300 1800 MW-315BR WG Round 2 9/8/2015 21.23 - - 2.6 - MW-317BR WG Round 1 615/2015 3.12 11.44 2.1 11 - MW-317BR WG Round 2 91812015 7.4 11:6 5.6 14.8 - MW-318D WG Round 1 6/2/2015 10.63 5.51 - - 1310 - 13 1 1150 577 MW-318D WG Round 2 9/912015 6.08 5.23 1300 6.7 720 430 MW-9 WG Round 1 6130/2015 84.09 - - - - 6.4 990 1000 MW-9D WG Round 1 612412015 66 - 1000 1.5 2600 600 MW-90 WG Round 2 901I2015 48.29 6.44 - - 1100 2.7 P 1400 1 1100 OW-303D WG Round 2 9112/2015 2.9 55 1000 15.i 53.2 14900 4500 OW-308D WG Round 1 6/25/2015 4.53 6.2 620 - - 36400 580 OW-308D WG Round 2 W 11120151 8.5 6.2 759 34700 690 0W-3100 WG Round 1 6/23/2015 2.28 - - - - 809 1100 - 1.2 1400 1200 - OW-310D WG Round 2 1 9111120151 5.82 - 782 980 1.9 3500 1600 - Notes: 1. This table only shows concentrations of constituents that exceed and regulatory standard or IMAC. 2. If a constituent does not have a regulatory criterion (aluminum, molybdenum, strontlum), it is not shown on this table. Orange Indicates concentration greater than PPBC Green indicates concentration less than PPBC pglL = micrograms per liter SU = standard unit J- = estimated concentration, biased low J = laboratory estimated concentration ,1+= estimated concentration, biased high U = results not detected at 02L = North Carolina groundwater standards as specified In T15A NCAC 02L IMAC = Interim Maximum Allow Concentration N = normal NTU = nephelomethc turbidity unit PPBC = Proposed Provisional Background Concentration PW = porewater T = total WG = groundwater Page 3 of 6 Table 2-10 Constituents of Interest Evaluation Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Constituent: Fraction: Unit: NC GW Criteria: Criteria Source: Thallium T Ng1L 0.2 1MAC Vanadium T Ug1L 0-3 1MAC Aal Dissolved Safi N Ng1L 500000 02L Sulfate N NgIL 250000 02L PPBC (Minimum (for rangesy): PPBC: - 0.2 1 - 260000 - 31000 Well Matrix Event Hate Result Flag Result Flag Result Flag Result Fla AB-10D WG Round 1 E12412015 1-5 - AB-100 WG Round 2 911112015 0.63 J 1320000 - - AB-10S PW Round 1 612612015 0.54 3 - - AB-10S PW Round 2 9/1112015 0.31 3.3 - AB-10SL PW Round 1 6IM2015 14.6 - AB-10SL IPW Round 2 9111/2015 0.44 30.7 AB-15S PW Round 1 6122/2015 3.4 254 - - AB-258R WG Round 1 612612015 - 5.5 AB-25BR WG Round 2 9/1112015 1-7 - AB-250 WG Round 1 612W2015 0.69 J AB-25D WG Round 2 9112/2015 0.64 J - AB-25S PW Round 1 6126/2015 13.3 - AB-25S PW Round 2 9/11/2015 1.5 689 AB-308R WG Round 1 6124/2015 0.91 ij A13_308 R WG Round 2 911012015 0.67 J - AB-30D W G Round 1 6124)2015 0.86 J AB-300 WG Round 2 911112015 1-1 AB-30S WG Round 1 6129/2015 - - AB-30S WG Round 2 9/1012015 18.3 AB-35BR WG Round 1 612512015 1.8 - AB-35BR WG Round 2 9110/2015 11 J 905000 J AB-50 W G Round 1 611812015 0.77 J - - AB-50 WG Round 2 9/912015 AB-5S PW Round 1 6119/2015 0.69 0.62 J - AB-5S PW Round 2 9/9/2015 1.6 33.7 AS-1010 WG Round 1 6181W015 - 15.3 - AS-100 WG Round 2 918/2015 30.6 AS-12S WG Round 1 6/912015 1.1 - AS- 12S WG Round 1 619/2015 _ AS-12S WG Round 2 918/2015 0.52 J - AS-21D WG Round 1 6117/2015 1.6 - - AS-21) WG Round 2 913/2015 - 1.4 - - - AS-40 WG Round 1 6/512015 4.8 - AS-40 WG Round 2 91W2015 AS-61) WG Round 1 6/8/2015 0.69 J-' - AS-60 WG Round 2 9/8/2015 0.4 J - AS-8BR WG Round 1 619/2015 2.7 - AS-88R WG Round 2 915/2015 - - - AS-8D WG Round 1 612/2015 1.8B J - AS-81) WG Round 2 919/2015 - F- BG-11) WG Round 3 11116/2015 45.8 6G-1 D WG Round 4 12/1512015 43 - BG-5D WG Round 1 6123/2015 - - BG-5D WG Round 2 91912015 0.46 J - - BG-51) WG Round 3 11/1612015 - - BG-50 WG Round 4 12/15/2015 - - - - - BG-5S WG Round 1 6/2412015 2.6 SG-5S WG Round 2 9/912015 0.82 J BG-5S WG Round 3 1111612015 0.31 J - BG-5S WG Round 4 1205f2015 - GWA-10D WG Round 1 614/2015 0.256 3.36 - GWA-101) WG Round 1 6/26/2015 - - - - GWA-10D WG Round 2 91BY2015 1.3 GWA-110 WG Round 1 6/512015 1.2 J+ GWA-11D WG Round 2 9/312015 0-45 J - GWA-115 WG Round 1 6110/2015 0.52 J - GWA-11S WG Round 2 9/312015 Oka J - GWA-12D WG Round 1 6/4/2015 5.65 - - GWA-120 WG Round 2 9/912015 3.7 - - GWA-12D WG Round 3 1111912C15 - 3.1 - - - GWA-12D WG Round 4 121M2015 2.3 - GWA-12S WG Round 1 6/412015 - - - - GWA-12S WG Round 2 9/11/2015 0.93 J GWA-12S WG Round 4 12/18/2015 2.4 J+ - GWA-14D WG Round 1 6/30/2015 0.67 J GWA-14D WG Round 2 91912015 0.62 J - GWA-14S WG Round 2 9/912015 0.48 J GWA-150 WG Round 1 613022015 1.5 - 705000 - 307000 GWA-1513 WG Round 2 1 911DY2015 3.2 618000 301000 Page 4 of 6 Table 2-10 Constituents of Interest Evaluation Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Constituent: Fraction: Unit: NC GW Criteria: Criteria Source: Thallium T Ng1L 0.2 IMAC Vanadium T Ug1L 0-3 IMAC AM Dissolved Soli N Ng1L 500000 02L Suitate N Ng1L 250000 02L PPBC (Minimum (tor ranges)): PPBC: - 0.2 1 - 260000 - 31000 Well Matrix Event Date Result Flag Result Flag, Result Flag Result Fla GWA-1D WG Round 1 6111/2015 0.79 J - - GWA-1D WG Round 2 9/8/2015 0.45 J - GWA-1S WG Round 1 6117/2015 1.5 - - GWA-1S WG Round 2 9191W015 0.39 J - GWA-2D WG Round 1 6/10/2015 0.57 J - - GWA-20 1WG Round 2 9/5/2015 0.65 J GWA-2S WG Round 1 6111/2015 1.3 - - GWA-2S WG Round 2 9/4/2015 - - 4.1 - GWA-31) WG Round 1 6/412015 - GWA-3D WG Round 2 9/4/2015 0.6 J - GWA-3S WG Round 1 61412015 GWA-3S WG Round 2 9I412015 0.56 J - GWA-41) WG Round 1 6123/2015 1.5 GWA-4D WG Round 2 9/912015 - 0.53 J - - - GWA-4S WG Round 1 60912015 0.6 1i GWA-4S WG Round 2 911012015 4.3 - GWA-5BR WG Round 1 6116/2015 0.49 J 873000 416000 GWA-5BR WG Round 2 9/9/2015 - - 799000 362000 GW'A-6D WG Round 1 612912015 - - GWA-6D WG Round 2 9I1112015 - - - GWA-6S WG Round 1 6/30/2015 6.5 - - GWA-6S WG Round 2 9/1212015 1.1 - - - GWA-7D WG Round 1 6/1612015 - GWA-7D WG Round 2 9AW2015 - - - GWA-7S WG Round 1 611912015 0.38 J GWA-7S WG Round 2 9110/2015 - - - GW'A-8D WG Round 1 615/2015 5.2 690000 J- 368000 - GWA-813 WG Round 2 WW2015 1.3 726000 346000 - GWA-8S WG Round 1 6118/2015 U.45 J - GWA-9D WG Round 1 611512015 1.8 - GWA-91) WG Round 2 9/9/2015 - GWA-9D WG Round 3 11116/2015 0.38 J - - GWA-91) WG Round 4 12/1512015 0.39 J - GWA-9S WG Round 1 611912016 5.1 - - - GWA-9S WG Round 2 91912015 0.59 J - - GWA-9S WG Round 3 1111612015 0.65 J GWA-9S WG Round 4 12/15/2015 - 0.74 J - MW-10 1WG Round 2 9111/2015 - - MW-101) WG Round 1 6124/2015 - MW-10D WG Round 2 911112015 - MW-11 WG Round 1 6/29/2015 2.6 - MW-11 WG Round 2 911112015 0.58 J - - MW-11D WG Round 1 612912015 - - MW-11D WG Round 2 9111/2015 0.51 J - - MW-12 WG Round 1 612W2015 2.6 - MW-12 1WG Round 2 919/2015 - - MW-12❑ WG Round i 6120/2015 1.4 MW-12D WG Round 2 919/2015 - - MW-20D WG Round 1 6/24/2015 0.41 J - MW-20S WG Round 1 6/2412015 - - - MW-21D WG Round 1 6123/2015 - 639000 274000 MW-21 D WG Round 2 9/1012015 - 0.72 J 599000 - 269000 - MW-21S WG Round 1 6124/2015 1.5 MW-213 IWG Round 2 911W2015 0.76 J MW-22BR WG Round 1 612512015 0.33 J - - MW-22BR WG Round 2 9I1112015 1.2 - MW-22S WG Round 1 6/2512015 0.74 J - MW-23BR WG Round 1 6/112015 0.55 1,38 - MW-23BR WG Round 2 9/10/2015 - MW-23BR WG Round 4 12/1512015 - 0.31 IJ - - - MW-23❑ WG Round 1 61M2015 - - - MW-23D 1VVG Round 4 12/15/2015 1.2 - - - MW-301BR WG Round i 6MV2015 1-8 MW-301BR WG Round 2 914/2015 0.81 J - MW-303BR WG Round 1 611212015 3.7 MW-303SR WG Round 2 9/412016 2 - MW-306BR WG I Round 1 6112120151 1.6 530000 IOW-306SR WG I Round 2 9/4)20151 1.6 778000 J+ 346000 - MW-308BR WG I Round 1 1 6115120151 0.84 1 J 1 844000 323000 Page 5 of 6 Table 2-10 Constituents of Interest Evaluation Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Constituent: Fraction: Unit: NC GW Criteria: Criteria Source: Thallium T pg/L 0.2 IMAC Vanadium T pg1L 0-3 IMAC AM Dissolved Soli N pgfL 500000 02L Sulfate N pg1L 250000 02L PPBC (Minimum (for rangesf): PPBC: - 0.2 1 - 260000 - 31000 Well Matrix Event Date Result Flag Result Flag Result Flag Result Fla MW-308DR WG Round 2 9/9/2015 - 1300000 586000 - MW-3106R WG Round 1 61IW2015 2.5 - - MW-310BR WG Round 2 919I2015 3.7 - MW-311BR WG Round 1 612912015 0.89 1 - MW-311BR WG Round 2 9111/2015 0.62 J - MW-314BR 1WG Round 1 6/25/2015 1.3 - MW-314BR WG Round 2 9/11)2015 0.02 J - MW-315BR WG Round 1 6119/2015 1 1A I- MW-315BR WG Round 2 918/2015 5.5 MW-31TBR WG Round 1 61512015 8.4 - - MW-317BR WG Round 2 91812015 5.9 MW-3180 WG Round 1 6/2/2015 0.654 J - MW-318D WG Round 2 91912015 _ MW-9 WG Found 1 613U12015 2.3 - - - - - MW-9D WG Round 1 6/24/2015 11.1 MW-90 WG Round 2 9111/2015 23 - - - OW-303D WG Round 2 9112/2015 0.56 36.5 OW-30813 WG Round 1 1 6125/2015 - - - OW-308D WG Round 2 9/11/2015 - - OW-3100 WG Round 1 6/2312015 1.2 - OW-3100 WG Round 2 1 MW20151 3.2 - Notes: 1. This table only shows concentrations of constituents that excee 2. If a constituent does not have a regulatory criterion (aluminum, Orange indicates concentration greater than PPBC Green indicates concentration less than PPBC pg/L = micrograms per liter SU = standard unit J- = estimated concentration, biased low J = laboratory estimated concentration J+ = estimated concentration, biased high U = results not detected at 02L = North Carolina groundwater standards as specified in T15A IMAC = Interim Maximum Allow Concentration N = normal NTU = nephelometric turbidity unit PPBC = Proposed Provisional Background Concentration PW = porewater T = total WG = groundwater Page 6 of 6 Table 2-11 Surface Water Sample Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event. Sample Date: Sample Type Code: Sample Name/ID- SW-1 SW-1 SW-10 SW-10 SW-11 SW-12 SW-13 SW-13 SW-3 Round 1 Round 2 Round 2 Round 2 Round 2 Round 2 Round 2 Round 2 Round 1 5/2712015 9111/2015 9IM2015 9/1412015 911412015 9114/2015 9114/2015 9/14/2015 5/2712015 N N N N N N N N N SW-1 DR-SW-1-NS-3015 DR-SW-10-NS-3015 DR-SW-10-WS-3Q15 DR-SW-11-NS-3Q15 DR-SW-12-NS-3015 DR-SW-I3-NS-30 DR-SW-13-NS-3015 SW-3 Constituent CAS RN' Fraction Criteria Min (range only) 02B Class C Surface Water Criteria Unit Aluminum 7429-90-5 D IL 43 100 U 100 U 100 U 10D U 100 U 12 Aluminum 7429-90-5 T 87 pIL 613 100 U 330 140 69 J 79 J 27600 Antimony 7440-36-0 D IL 1.02 1.1 0.5 U 0.5 U 0.5 U 0.5 U 1 U Antimony 7440-36-0 T 640 pgIL 1.21 0.97 0.16 J 0.6 U 0.5 U 0-5 U 1 U Arsenic 7440-38-2 D 150 pgIL 13.8 31.8 40.4 1.7 1.6 0.93 42.7 Arsenic 7440-38-2 T 10 u IL 15.5 37.9 49.4 2.1 1.8 1 63.7 Barium 7440-39-3 D IL 20 110 34 27 26 23 42 Barium 7440-39-3 T - 200000 IL 18 120 38 30 30 23 267 Beryllium 7440-41-7 D 6.5 pgIL 1 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 1 'U Beryllium 744041-7 T IL 1 U 02 U 0.2 U 0.2 U 0.2 U 0.2 U 1.16 Boron 7440-42-8 D pgIL 180 180 170 120 89 65 128 Boron 744042-8 T - - jjgIL 157 190 160 130 100 62 107 Cadmium 7440-43-9 D 0.15 I&L 1 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 1 U Cadmium 744043-9 T - IL 1 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 1 U Calcium 7440-70-2 T pqIL 19700 20800 2270D 20000 20400 19300 20000 Chromium 744047-3 D 11 jjgIL 1 U 0.25 J 0.26 J 0.2 J 0.2 J 0.34 J 1 U Chromium 7440-47-3 T pqIL 1 U 0.26 J 0.37 J 0.24 J 0.24 J 0.49 J 33.6 Cobalt 7440-48-4 D - pgIL 1 U 0.5 U 0.46 J 0.52 0.59 0.45 J 1 U Cobalt 7440-48-4 T 4 IL 1 U 0.22 J 0.88 D.65 0.9 0,54 15.5 Copper 7440-50-8 D 2.7 pqIL 3.39 J+ 0.52 J 2.8 8.7 J 10.7 2.4 1 UJ Copper 7440-50-8 T IL 4.75 0.3 J 0.63 J 0.54 J 0.61 J 0.65 J 27.3 Iron 7439-89-6 D pgIL 21 50 U 50 U 50 U 50 U 50 U 40 Iron 7439-89-6 T WgIL 323 220 630 310 240 240 42400 Lead 7439-92-1 D 0.54 p IL 1 U 022 0.26 0.85 J _ 1.3 0.19 1 U Lead 7439-92-1 T wgIL 1 U 0.06 J 0.36 0.15 0.14 0.098 J 20.1 Magnesium 7439-95-4 T jjgIL 7240 6680 6680 6390 6610 6370 5850 Manganese 7439-96-5 D wqIL 16 59 400 250 270 150 584 Manganese 7439-96-5 T - IL 9 140 520 280 430 160 1820 Mercu 7439-97-6 T 0.012 IL 0.0011 J+ 0.00778 0.00125 0.000988 0.000792 0.000671 0.00385 J+ Methane 74-82-8 N IL 10 UJ 15 39.1 26.8 45.9 31.4 20 UJ Molybdenum 7439-98-7 D IL 9.11 10.8 9.1 5.7 4.1 2.7 2.56 Molybdenum 7439-98-7 T 2000 IL 9.36 9.7 8.6 6 4.5 2.7 9.85 Nickel 7440-02-0 D 16 IL 1.2 1.6 0.65 0.76 0.75 0.47 J 1 U Nickel 7440-02-0 T - IL 2.5 1.6 0,72 0.62 0.63 0.53 15.9 Potassium 7440-09-7 T IL 3090 5540 3620 J 2800 J 2660 J 5000 U 3710 Selenium 7782-49-2 D - pgIL 2.32 1.9 0.5 U 0.5 U 0.5 U 0-5 U 1 U Selenium 7782-49-2 T 5 pgIL 2.87 2 0.5 U 0.5 U 0.5 U 0.5 U 1 U Sodium 7440-23-5 T IL 11500 8890 13300 12700 11900 11100 10800 Strontium 7440-24-6 D IL 322 290 310 240 220 210 264 Strontium 7440-24-6 T - 40000 pgIL 320 300 300 250 250 200 302 Thallium 7440-28-0 D IL 0.2 U 0.021 J 0.1 U 0.1 U 0.1 U 0.1 U 0.2 U Thallium 7440-28-0 T - 0.47 IL 0.2 U 0.019 J 0.1 U 0.1 U 0.1 U 0.1 U 0.315 Vanadium 7440-62-2 D IL 4.94 2.4 1 U 1 U 1 U 1 U 1.25 Vanadium 7440-62-2 T IL 6.65 2.5 0.98 J 0.8 J 0.85 J 0.57 J 54.1 Zinc 7440-66-6 D 36 pgIL 34 J+ 10 U 8.7 J 1 D U 10 U 12 5 UJ Zinc 7440-66-6 T - wqIL 212 10 U 10 U 10 U 10 U 10 U 93 Total Dissolved Solids TDS N pgIL 140000 136000 144000 135000 127000 124000 120000 Total Organic Carbon TOC N IL 3800 4500 1100 1200 15400 1600 2200 Total Suspended Solids TSS N IL 16000 3500 16000 2800 3500 2600 U 680000 Alkalinity, CO3 ALK-CO3 N - P91L 11000 5000 U 5000 U 5000 U 5000 U 5000 U 10000 U Alkalinity, HCO3 ALK-HCO3 N IL 23000 45400 85400 81900 72000 72800 51000 Alkalinity, lab ALK-LAB N - pgIL 37000 45400 85400 J- 81900 J- 72000 J- 72800 J- 51000 Chloride 16887-00-6 N 230000 IL 11000 8900 11600 11600 11500 11600 11000 Nitrite as N 14797-65-0 N - wqIL 29 - - - - - 76 Nitrogen, NO2 plus NO3 NO2-NO3 N IL 47 28 J 32 25 Sulfate 14808-79-8 N pgIL 53000 40200 20100 18100 14700 12900 23000 Sulfide 18496-25-8 N IL 100 U 100 U 100 U 100 U 100 U 100 U 100 U Arsenic 7440-38-2 T 10 pgIL - - 47.4 - 1.51 J 1.83 0.658 - - Chromium 7440-47-3 T IL 0.474 J 1 J 0.69 J 0.386 J Iron 7439-89-6 T kjqIL 155 J 216 J 199 J 195 J Manganese 7439-96-5 D WgIL 434 J 232 J 266 J 141 J Manganese 7439-96-5 T _ IL - 425 J 277 J 291 J 156 J As III 7784-46-5 T WgIL 19.7 0.841 J 0.971 0.516 As V 10103-60-3 T Il- - 27.7 0.668 J 0.857 0.5 U Chromium I 18540-29-9 T IL 0.012 J 0.018 J 0.016 J 0.019 J Fe II 1345-25-1 T IL - 30 UJ 11.4 J 30 UJ 16.1 J Fe III 1309-37-1 T pgIL Mn II 134443-0 T jjgIL - Page 1 of 6 Table 2-11 Surface Water Sample Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Namelll SW-1 SW-1 SW-10 SW-10 SW-11 SW-12 SW-13 SW-13 SW-3 Round 1 Round 2 Round 2 Round 2 Round 2 Round 2 Round 2 Round 2 Round 1 5/2712015 9111/2015 9IM2015 9/1412015 911412015 9114/2015 9114/2015 9/14/2015 5/2712015 N N N N N N N N N SW-1 DR-SW-1-NS-3015 DR-SW-10-NS-3015 DR-SW-10-WS-3Q15 DR-SW-11-NS-3Q15 DR-SW-I2-NS-3015 DR-SW-I3-NS-30 DR-SW-13-NS-3415 SW-3 Constituent CAS RN Fraction Criteria Min (range only) 02B Class C Surface Water Criteria Unit Mn IV 1313-13-9 T IL Se IV 10102-18-8 T pg1L - 2 U - 2 U 2 U 2 U Se(VI) 13410-01-0 T IL 2 U 2 U 2 U 2 U Dissolved Oxygen DO N L - 2.5 7.76 Temperature TEMP N Deg C 27.4 16.2 H PH N 6 9 SU - 7.3 7.4 - Turbidity, field TURB N NTU 5.61 8.85 Specific Conductivit field SC N Sicm 219.1 200:9 - Oxidation Reduction Potential ORP N mV 125.7 148.8 Notes: pglL = micrograms per liter pSlcm = microsiemens per centimeter ft = feet mglL = milligrams per liter mV = millivolts NTU - nephelometrio turbidity units pCVL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+= estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L = North Carolina groundwater standards as specified in T15A NCAC 02L ❑ = dissolved Deg C = degree Celsius ❑HHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 2 of 6 Table 2-11 Surface Water Sample Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: SW-3 SW-3 SW-4 $W-4 SW4 SW-5 SW-5 SW-5 SW-6 Round 1 Round 2 Round 1 Round 1 Round 2 Round 1 Round 1 Round 2 Round 1 611812015 9111/2015 5127/20/5 6/18/2015 9/1112015 5/27/2015 611812015 9/1112015 613012015 N N N N N N N N N SW-3 DR-SW-3-NS-3015 SW-4 SW-4 DR-SW-4-NS-3Q15 SW-5 SW-5 DR-SW-5-NS-3015 SW-6 Constituent CAS RN' Fraction Criteria Min (range only) 02B Class C Surface Water Criteria Unit Aluminum 7429-90-5 D IL 100 J 5 U 100 U 5 U 100 U Aluminum 7429-90-5 T 87 pIL 250 127 63 J 90 100 U - Antimon 7440-36-0 D IL 0.5 J 1 U 0.5 U 1 U 0.41 J 0.17 J Antimony 7440-36-0 T 640 pgIL - 0.5 U 1 U 0.6 U 1 U 0.45 J 0.16 J Arsenic 7440-38-2 D 150 pgIL 1.7 1 U 0.29 J 1 U 0.42 J 0.17 J Arsenic 7440-38-2 T 10 u IL 2 1 U 0.14 J 1 U 0.48 J 0,24 J Barium 7440-39-3 D IL 27 18 20 24 17 19 Barium 7440-39-3 T - 200000 IL - 34 18 22 25 18 25 Beryllium 7440-41-7 D 6.5 pgIL 0.2 U 1 U 0.2 U 1 U 0.2 U 0.2 U Beryllium 744041-7 T IL - 0.2 U 1 U 0.2 U 1 U 0.2 U 02 U Boron 7440-42-8 D pgIL 120 50 U 35 J 58 74 150 Boron 744042-8 T - - jjgIL 120 50 U 29 J 57 72 160 Cadmium 7440-43-9 D 0.15 uaIL 0.08 U 1 U 0.08 U 1 U 0.08 U 0.08 U Cadmium 744043-9 T - IL 0.08 U 1 U 0.08 U 1 U 0.08 U 0.08 U Calcium 7440-70-2 T pqIL 20800 14000 19500 13800 10700 6300 Chromium 744047-3 D 11 IL - 0.21 J 1 U 024 J 1 U 0.25 J 0.49 J Chromium 7440-47-3 T IL 0.64 1 U 0.3 J 1 U 0.63 0.67 Cobalt 7440-48-4 D - IL 0.45 J 1 U 0.6 U 1 U 0.16 J 0.15 J Cobalt 7440-48-4 T 4 IL 0,87 1 U 0.18 J 1 U 0.21 J 0.48 J Copper 7440-50-8 D 2.7 p IL 8.6 7.38 J+ 8.1 1 U 4.6 2.2 Copper 7440-50-8 T IL 0.83 J 1 U 0.71 J 4.62 J+ 1.2 J+ 1.6 Iron 7439-89-6 D pgIL - 30 J 33 26 J 68 30 J - Iron 7439-89-6 T WgIL 580 339 170 412 290 Lead 7439-92-1 D 0.54 p IL 1.1 1 U 1 1 U 0.38 0.2 Lead 7439-92-1 T wgIL 0.37 1 U 0.087 J 1 U 0.14 0.88 Magnesium 7439-954 T jjgIL - 6160 4390 5940 5500 4110 2560 Manganese 7439-96-5 D PqIL 210 90 23 315 89 22 Manganese 7439-96-5 T - IL - 300 93 46 290 98 83 Mercu 7439-97-6 T 0.012 IL 0.0019 J+ 0.000978 J+ 0.00202 J+ 0.0012 J+ 0.00222 J+ 0.00334 J+ Methane 74-82-8 N IL 26.1 10 UJ 6.1 J+ 10 UJ 47 J 9.9 J+ Molybdenum 7439-98-7 D IL 5.9 1 U 0.49 J 1 U 0.61 0.39 J Molybdenum 7439-98-7 T 2000 IL 5.3 1 U 0.46 J 1 U 0.59 0.26 J Nickel 7440-02-0 D 16 IL 0.76 1 U 0.48 J 1 U 0.36 J 0.78 Nickel 7440-02-0 T - IL - 0.96 1 U 0.36 J 1 U OA5 J+ 0.67 Potassium 7440-09-7 T IL 2810 J 1410 500 U 2230 2510 J 5000 U Selenium 7782-49-2 D - pgIL - 0.5 U 1 U 0.5 U 1 U 0-5 U 0.5 U Selenium 7782-49-2 T 5 pgIL 0.5 U 1 U 0.5 U 1 U 0.5 U 0.5 U Sodium 7440-23-5 T IL 13000 8640 10600 9210 7210 4010 J Strontium 7440-24-6 D IL 260 143 210 134 97 42 Strontium 7440-24-6 T - 40000 pgIL 270 151 200 143 100 45 Thallium 7440-28-0 D IL 0.1 U 0.2 U 0.1 U 0.2 U 0.1 U 0.025 J Thallium 7440-28-0 T - 0.47 IL - 0.1 U 0.2 U 0.1 U 0.2 U 0.1 UJ 0.1 U Vanadium 7440-62-2 D IL 0.78 J 0.3 U 0.55 J 0.3 U 0.5 J 1.2 Vanadium 7440-62-2 T IL - 1.1 0.567 1 U 0.42 0.33 J 2.8 Zinc 7440-66-6 D 36 pgIL 10 U 17 J+ 10 U 5 UJ 10 U 4.7 J Zinc 7440-66-6 T - wqIL 10 U 5 U 10 U 5 U 10 U 5 J+ Total Dissolved Solids TDS N pgIL 149000 97000 126000 110000 83000 72000 Total Organic Carbon TOC N IL - 1600 1500 2200 2700 4000 3300 Total Suspended Solids TSS N IL 13100 5000 U 3900 5000 J 2500 U 24700 Alkalinity, CO3 ALK-CO3 N - P91L - 5000 U 10000 U 5000 U 10000 U 5000 U 5000 U Alkalinity, HCO3 ALK-HCO3 N IL 69600 52000 67100 50DOO 34700 17600 Alkalinity, lab ALK-LAB N IL - 69600 52000 67100 50000 34700 17600 Chloride 16887-DO-6 N 230DOO IL 12900 10000 13900 13000 9400 9400 Nitrite as N 14797-65-0 N - wqIL - 145 - 300 - - Nitro en, NO2 plus NO3 NO2-NO3 N IL 110 J- 260 Sulfate 14808-79-8 N - pgIL 15300 5900 5500 10000 6900 5100 Sulfide 18496-25-8 N IL 10O U 100 U 100 U 100 U 100 U 100 U Arsenic 7440-38-2 T 10 pgIL - - - - - - - Chromium 7440-47-3 T IL Iron 7439-89-6 T pgIL - Manganese 7439-96-5 D wgIL Manganese 7439-96-5 T _ IL - - - - - As III 7784-46-5 T WgIL 11 0.054 0.144 As V 10103-60-3 T IL 15.6 0.083 - 0.208 Chromium I 18540-29-9 T IL 0.019 0.029 0.017 Fe II 1345-25-1 T IL 27.9 9.3 - 30-2 Fe III 1309-37-1 T IL 51.5 J+ 11.7 J+ 28.1 J+ Mn II 1344�3 0 T IL 242 J- 4$.3 J- - 239 J- Page 3 of 6 Table 2-11 Surface Water Sample Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event. Sample Date: Sample Type Code: Sample Name/ID: SW-3 SW-3 SW-4 $W-4 SW4 SW-5 SW-5 SW-5 SW-6 Round 1 Round 2 Round 1 Round 1 Round 2 Round 1 Round 1 Round 2 Round 1 611812015 9111/2015 5127/20/5 6/18/2015 9/1112015 5/27/2015 611812015 9/1112015 613012015 N N N N N N N N N SW-3 DR-SW-3-NS-3015 SW-4 SW-4 DR-SW-4-NS-3Q75 SW-5 SW-5 DR-SW-5-NS-3015 SW-6 Constituent CAS RN Fraction Criteria Min (range only) 02B Class C Surface Water Criteria Unit Mn IV 1313-13-9 T IL 15.3 8.9 12.1 Se IV 10102-18-8 T pg1L 0.5 U 0.5 U - 0.5 U Se(VI) 13410-01-0 T IL 0.5 U 0.5 U 0.5 U Dissolved Oxygen DO N L - 5.57 - 7.27 - 4.7 7.73 Temperature TEMP N Deg C 19.9 20.2 22.7 29.9 H PH N 6 9 SU - 7.4 7.2 6.74 7.12 Turbidity, field TURB N NTU 9.38 7.95 3.91 46.47 Specific Conductivit field SC N Sicm 215.9 194.1 128 50.2 Oxidation Reduction Potential 1 ORP N mV 111.8 158.7 1 143.8 157.8 Notes: pg1L = micrograms per liter pS1cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter mV = millivolts NTU - nephelometrEc turbidity units pCVL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+= estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (s 02L = North Carolina groundwater standards as specified in T15A NCAC 02L ❑ = dissolved Deg C = degree Celsius ❑HHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 4 of 6 Table 2-11 Surface Water Sample Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: SW-6 SW-7 SW-7 SW-8 SW-8 SW-9 SW-9 Round 2 Round 1 Round 2 Round 1 Round 2 Round 1 Round 2 911012015 613012015 9110/2015 6130/2015 9/1012015 512712015 9111/2015 N N N N N N N DR-SW-6-NS-3015 SW-7 DR-SW-7.NS-3015 SW-8 DR-SW-$-NS-3Q15 SW-9 DR-SW-9-NS-3015 Criteria Min 02B Class C (range Surface Water Constituent CAS RN' Fraction only) Criteria Unit Aluminum 7429-90-5 D IL 100 U 100 U 100 U 5 U 100 U Aluminum 7429-90-5 T 87 pgIL 380 - 550 - 320 129 360 Antimony 7440-36-0 D pqIL 0.18 J 0.2 J 0.21 J 0.5 U 0.23 J 1 U 0.58 Antimony 7440-36-0 T 640 IL 0.6 U 0.22 J 0.5 U 0.5 U 0.6 U 1 U 0.72 Arsenic 7440-38-2 D 150 pgIL 0.21 J 0.14 J 0.21 J 0.14 J 0.33 J 46.3 59 Arsenic 7440-38-2 T 10 P91L 0.37 J 0.24 J 0.35 J 022 J 0.2 J 51.1 75.9 Barium 7440-39-3 D IL 20 18 20 19 20 88 92 Barium 7440-39-3 T - 200000 kjqtL 26 29 25 24 24 99 120 Beryllium 7440-41-7 D 6.5 IL 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 1 U 0.2 U Beryllium 744041-7 T - pgIL 02 U 0.2 U 0.2 U 0.2 U 0.2 U 1 U 0.111 Boron 7440-42-8 D jigIL 220 130 190 170 130 360 380 Boron 744042-8 T - P91L 240 130 180 180 160 364 400 Cadmium 7440-43-9 D 0.15 WgIL 0.08 U 0.08 U 0,08 U 0.08 U 0.08 U 1 U 0.08 U Cadmium 744043-9 T PgIL 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 1 U 0.08 U Calcium 7440-70-2 T L 8020 5910 7770 6340 7850 45400 51600 Chromium 744047-3 D 11 pgIL 0.3 J+ 0�24 J 0.24 J+ 0.46 J 0.84 J+ 1 U 0.45 J Chromium 7440-47-3 T iluaVIL 0.87 0.68 0.9 0.59 0.41 J 1 U 1 Cobalt 7440-48-4 D - pgIL 0.6 U 0.5'U 0.13 J 0.5 U 0.43 J 1 U 0.5 U Cobalt 7440-48-4 T 4 IL 0.42 J 0.51 0.47 J 0.32 J 0.16 J 1 U 0.74 Copper 7440-50-8 D 2.7 pgIL 12 J+ 2 2.8 J+ 2.8 1.6 J+ 1 U 0.23 J Copper 7440-50-8 T IL 1.4 J+ 1.8 1.5 J+ 1.3 3 J+ 5.11 J+ 1.7 Iron 7439-89-6 D pgIL 140 - 41 J - 29 J IOU 50 U Iron 7439-89-6 T pgIL 1000 1200 800 140 550 Lead 7439-92-1 D 0.54 lj IL 0.26 J+ 0.088 J 0.21 J+ 0.061 J 0.62 J+ 1 U 0.1 U Lead 7439-92-1 T - IL 0.73 0.97 0.77 0.64 0.2 J+ 1 U 0.83 Magnesium 7439-95-4 T IL 3380 2480 3310 2580 3280 13500 14300 Manganese 7439-96-5 D pqIL 52 16 50 15 63 35 5 U Manganese 7439-96-5 T IL 83 98 81 55 94 154 230 Mercu 7439-97-6 T 0.012 pqIL 0.00194 J+ 0.00357 J+ 0.00201 J+ 0.00296 J+ 0.00187 J+ 0.000949 J+ 0.0011 J+ Methane 74-82-8 N IL 17.4 J+ 9.6 J+ 11.7 J+ 16.3 J+ 35.5 J+ 10 UJ 16.4 Molybdenum 7439-98-7 D L 0.63 0.41 J 0.62 0.43 J 0.59 7.62 9.4 Molybdenum 7439-98-7 T 2000 UaIL 0.65 0.26 J 0.56 026 J 0.72 7.65 9.8 Nickel 7440-02-0 D 16 L 0.35 J+ 0.58 0.33 J+ 1.6 0.59 J+ 1 U 0.7 Nickel 7440-02-0 T IL 0.58 J+ 0.6 0.64 J+ 0.47 J 0.48 J+ 1.16 1.6 Potassium 7440-09-7 T L 2510 J 5000 U 2570 J 5000 U 2630 J 4690 5840 Selenium 7782-49-2 D - pgIL 0.5 U 0.5 U 0.5 U 0.5 U 0.6 U 1 U 0.36 J Selenium 7782-49-2 T 5 pgIL 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 1 U 0.45 J Sodium 7440-23-5 T - vgIL 6230 4260 J 6900 3900 J 7560 17000 18700 Strontium 7440-24-6 D IL 57 41 54 43 53 883 1000 Strontium 7440-24-6 T - 40000 PgIL 57 45 52 46 52 895 1100 Thallium 7440-28-0 D L 0.1 U 0.1 U 0.1 U 0.1 U 0.018 J 0.2 U 0.017 J Thallium 7440-28-0 T - 0.47 jjgIL 0.022 J 0.1 U 0.025 J 0.1 U 0.1 U 0.2 U 0.036 J Vanadium 7440-62-2 D IL 1 0.85 J 0.96 J 0.69 J 2.6 0.701 1.1 Vanadium 7440-62-2 T IL 3 3.1 3.1 2.5 1 0:947 2.7 Zinc 7440-66-6 D 36 pqIL 10 UJ 10 U 13 J+ 10 U 13 J+ 18 J+ 10 U Zinc 7440-66-6 T - IL 10 U 20 J+ 10 U 4.6 J+ 61 10 16 Total Dissolved Solids TDS N pqIL 71000 74000 63000 73000 J 68000 270000 290000 Total Organic Carbon TOC N pgIL 2400 3500 2600 5900 2400 2100 1600 Total Suspended Solids TSS N pqIL 16100 24500 17100 19200 13300 32000 35200 Alkalinity, CO3 ALK-CO3 N - pgIL 6000 U 5000 U 5000 U 5000 U 5000 U 10000 U 5000 U Alkalinity, HCO3 ALK-HCO3 N IL 22500 16800 24200 18300 23200 100000 114000 Alkalinity, lab ALK-LAB N - IL 22500 16800 24200 18300 23200 100000 114000 Chloride 16887-00-6 N 230000 IL 13000 9400 12100 9800 11600 13000 14500 Nitrite as N 14797-65-0 N - IL - - - - - 132 - Nitro en, NO2 plus NO3 NO2-NO3 N L 380 310 460 270 650 210 J- Sulfate 14808-79-8 N - PqIL 5000 5000 5300 5000 5300 90000 90300 Sulfide 18496-25-8 N - L 100 U 100 U 100 U 100 U 100 U 100 U 100 U Arsenic 7440-38-2 T 10 pgIL - - - - - - - Chromium 7440-47-3 T L Iron 7439-89-6 T L - - Manganese 7439-96-5 D wCJIL Manganese 7439-96-5 T IL - - - As III 7784-46-5 T pqIL As V 10103-60-3 T IL - - Chromium I 18540-29-9 T pqIL Fe II 1345-25-1 T pgIL - - Fe III 1309-37-1 T ILL 1344�30 T - Page 5 of 6 Table 2-11 Surface Water Sample Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: SW-6 SW-7 SW-7 SW-8 SW-8 SW-9 SW-9 Round 2 Round 1 Round 2 Round 1 Round 2 Round 1 Round 2 911012015 613012015 9110/2015 6130/2015 9/1012015 512712015 9111/2015 N N N N N N N DR-SW-6-NS-3015 SW-7 DR-SW-7.NS-3015 SW-8 DR-SW-$-NS-3Q15 SW-9 DR-SW-9-NS-3015 Constituent CAS RN Fraction Criteria Min (range only) 02B Class C Surface Water Criteria Unit Mn IV 1313-13-9 T IL Se IV 10102-18-8 T pg1L - - Se(VI) 13410-01-0 T I ua/L Dissolved Oxygen DO N mc#L - 7.68 T95 619 5.8 7.8 Temperature TEMP N Deg C 24.6 25.6 23.7 25.4 28.5 H PH N 6 9 SU - 7.12 7.3 6.97 6.9 7.6 Turbidity, field TURB N NTU 46.71 35.29 33.08 24.02 17.9 Specific Conductivity field Sc NVS/cm 1 1 49 120.1 502 123.1 453.9 Oxidation Reduction Potential ORP N mV 1 1 199.9 157.3 203.7 193.8 90.3 Notes: pg1L = micrograms per liter pS1cm = micros iemens per centimeter It = feet mg1L = milligrams per liter mV = millivolts NTU - nephelometrio turbidity units pCVL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+= estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (s 02L = North Carolina groundwater standards as specified in T15A NCAC 02L ❑ = dissolved Deg C = degree Celsius ❑HHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 6 of 6 Table 2-12 Areas of Wetness Sampling Analytical Results - Rounds 1, 2, and 3 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NamellD: S-1 S-1 S-1 S-2 S-3 S.6 Round 1 Round 1 Round 2 Round 2 Round 2 Round 3 512712015 612612015 9/12/2015 9/14/2015 9/14/2015 1112412015 N N N N N N S-1 S-1 DR-S.1-NS-3015 DR-S-2-NS-3015 DR-S-3-NS-3015 DR-S-E-NS-4Q15-1 Constituent CAS RN Fraction Criteria Min (range (range only) NCDE002L GWQS, MI DHHS Criteria Source Unit Aluminum 7429-90-5 D IL 5 U 10O U 100 U 100 U 100 U Aluminum 7429-90-5 T pgIL 3410 4300 280 640 120 Antimony 7440-36-0 D - IL 1 U 0.34 J 0.5 U 0.25 J 0.5 U Antimony 7440-36-0 T 1 IMAC pgIL 1 U 0.45 J 0.5 U 0.26 J 0.5 U Arsenic 7440-38-2 D - p IL 1 U 7.5 0.5 lJ 1.7 207 Arsenic 7440-38-2 T 10 02L p IL 1.68 14.1 0.16 J 2.3 204 J+ Barium 7440-39-3 D - p IL 20 50 40 55 50 Barium 7440-39-3 T 700 02L jjqIL 54 160 42 62 53 Be lium 7440-41-7 D - wqIL 1 U 0.2 U 0.2 U 0.2 U 0.2 U Beryllium 7440-41-7 T 4 IMAC pqIL 1 U 1.1 0.2 U 0.2 U 0.2 U Boron 7440-42-8 D - p IL 50 U 290 220 260 280 Boron 7440-42-8 T 700 02L pqIL 50 U 240 210 260 300 Cadmium 7440-43-9 D IL 1 U 0.08 U 0.08 U 0.08 U 0.08 U Cadmium 7440-43-9 T 2 02L pgIL 1 U 0.085 0.08 U 0.08 U 0.08 U Calcium 7440-70-2 T IL 14400 25200 J- 16900 21000 29800 Chromium 7440-47-3 ❑ - pqIL 1 U 0.22 J+ 0.21 J 0.39 J 0.25 J+ Chromium 7440-47-3 T 10 02L IL 3.86 17.6 0.28 J 0.42 J 0.81 J+ Cobalt 7440-48-4 D IL 1 U 3.1 J+ 0.37 J 1.1 0.7 Cobalt 7440-48-4 T 1 IMAC p IL 4.88 17.5 0.5 J 1.9 0.88 Copper 7440-50-8 ❑ - pgIL 5.62 1.4 J+ 1 U 1 A 1 U Copper 7440-50-8 T 1000 02L IL 6.15 J+ 13.4 J+ 0.24 J 0.43 J 0.41 J Iron 7439-89-6 D IL 18 190 50 U 36 J 140 Iron 7439-89-6 T 300 02L p IL 5720 7700 390 970 330 Lead 7439-92-1 D IL 1 U 0.16 J+ 0.052 J 0.11 0.051 J+ Lead 7439-92-1 T 15 02L p IL 3.97 16.2 0.28 0.71 0.25 Magnesium 7439-954 T IL 4500 8430 5260 5860 6690 Manganese 7439-96-5 D p IL 107 640 87 350 1100 Manganese 7439-96-5 T 50 02L p IL 829 940 89 380 1100 Mercury 7439-97-6 T 1 02L IL 0.0005 UJ 0.00845 0.00154 0.00583 0.00231 J+ Methane 74-82-8 N - pq1L 1 10 UJ 219 16.6 143 161 J Molybdenum 7439-98-7 ❑ P91L 1.25 18.9 0.33 J 15.2 21.1 Molybdenum 7439-98-7 T pqIL 1.57 12.3 0.31 J 13.6 18.8 Nickel 7440-02-0 D IL 1 U 1 J+ 0.36 J 0.81 0.64 Nickel 7440-02-0 T 100 02L pqIL 3.3 10.6 J+ 0.39 J 0.86 0.91 J+ Potassium 7440-09-7 T - p IL 1590 4120 J 4800 J 5270 5820 Selenium 7782-49-2 D IL 1 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium 7782-49-2 T 20 02L pgIL 1 U 2.1 0.5 U 0.5 U 0.5 U Sodium 7440-23-5 T IL 9070 16900 13800 15400 15100 Strontium 7440-24-6 ❑ IL 157 330 240 300 460 Strontium 7440-24-6 T PqIL 166 380 240 300 470 Thallium 7440-28-0 D - p IL 0.2 J 0.1 J 0.022 J 0.1 J 0.1 U Thallium 7440-28-0 T 0.2 IMAC pqIL 0.2 U 0.16 0.031 J 0.044 J 0.028 J+ Vanadium 7440-62-2 D IL 0.3 U 1.6 1 U 0.3 J 0.35 J Vanadium 7440-62-2 T 0.3 IMAC p IL 8.06 41.8 0.52 J 1.7 0.89 J Zinc 7440-66-6 D - wqIL 11 J+ 13 J+ 6.7 J 10 10 u Zinc 7440-66-6 T 1000 021- pqIL 17 26 6.6 J 10 U 10 U Total Dissolved Solids TDS N 500000 02L p IL 99000 154000 128000 127000 158000 Total Organic Carbon TOC N IL 2100 6700 900 J 650 J 670 J+ Total Suspended Solids TSS N 11- 180000 4360000 3700 44000 24700 Alkalinity. CO3 ALK-CO3 N pgIL 10000 LI 5000 UJ 5000 U 5000 U 5000 t1 Alkalinity, HCO3 ALK-HCO3 N JqIL 51000 72500 39300 56700 107000 Alkalinity, lab ALK-LAB N - IL 51000 72500 39300 J- 56700 J- 107000 Chloride 16887-00-6 N 250000 02L IL 10000 11800 11700 11700 10700 Nitrite as N 14797-65-0 N 1000 02L IL 117 - Nitro en, NO2 plus NO3 NO2-NO3 N IL - 20'U 28 34 140 Sulfate 14808-79-8 N 250000 02L ppIL 9400 32600 34600 29100 18100 Sulfide 18496-25-8 N IL 200 U 100 U 100 U 100 U 100 U Arsenic 7440-38-2 T 10 02L p IL - - 0.275 J 1.17 J- 214 Chromium 7440-47-3 T 10 02L IL 0.56 J 1.36 J 1.32 Iron 7439-89-6 T 300 02L p IL 212 J 237 J 1520 J Manganese 7439-96-5 D IL - 83.3 J 381 J 1120 Manganese 7439-96-5 T 50 02L p IL - 77.4 J 380 J 2100 J As(III) 7784-46-5 T - IL 0.402 0.156 J 0.889 146 As V 10103-60-3 T IL 0.195 0.5 U 0.279 J 67.5 Chromium (VI) 18540-29-9 T 0.07 DHHS p IL 0.022 J+ 0.011 J 0.0092 J 0.016 J- Fe II 1345-25-1 T IL 20 U 32.5 J 27.8 J 166 J Fe Ili 1309-37-1 T IL 29.9 - - - Mn II 1344-43-0 T IL 229 IV 1313-13-9 T 1 UJMn - - Page 1 of 2 Table 2-12 Areas of Wetness Sampling Analytical Results - Rounds 1, 2, and 3 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NamellD: S-1 S-1 S-1 S-2 S-3 S-6 Round 1 Round 1 Round 2 Round 2 Round 2 Round 3 512712015 612612015 9/12/2015 9/14/2015 9/14/2015 1112412015 N N N N N N S-1 S-1 DR-S-I-NS-3015 DR-S-2-NS-3015 DR-S-3-NS-3015 DR-S-E-NS-4Q15-1 Constituent CAS RN Fraction Criteria Min (range only) NCDEQ 02L GWQS, IMACs, DHHS Criteria Source Unit Se(IV) 10102-18-8 T IL 0.5 lJ 2 U 2 U 2 U Se Vl) 13410-01-0 T 1L 0.5 U - 2 U 2 U 2 U Dissolved Oxygen DO N m iL 7,02 2.3 4.71 7.02 - Temperature TEMP N - Deg C 24.9 17.1 17.3 17.1 H PH N 6.5 8.5 02L SU 7,65 7.5 6.89 7.1 - ITurbidity, field TURB N NTU 5,17 19.74 71 45.89 S ecific Conductiv�it field SC N Slcm 173.8 255.7 18 207.8 - Oxidation Reduction Potential ORP N 1 208.6 1 127.9 112 139.3 Notes: pg1L = micrograms per liter pSfcm = microsiemens per centimeter It = feet mg1L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCVL. = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 028 = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOG = total organic carbon Page 2 of 2 Table 2-13 NCDEQ Sample Location Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: CCSW001 CCSW001 CCSWO02OUT DRRC001 DRRC001 Round 1 Round 1 Round 2 Round 1 Round 2 71112015 7/112015 911412015 711/2015 911412015 FD N N N N CCSWOUI-DUP CCSW001 DR-CCSW002OUT-NS-3Q1 DRRC001 DR-DRRC001-NS-3Q15 Constituent CAS RN Fraction SWQS Criteria NCDEQ 02S GWQS Criteria. NCDEQ 02L Unit Aluminum 7429-90-5 D - - wit. - 100 U 100 U Aluminum 7429-90-5 T - 87 - - IL - 3500 - 2300 Antimony 7440-36-0 D - - - - /L 0.3 J 0.5 U 0.5 U 0.5 U Antimony 7440-36-0 T - 640 - 1 1L 0,24 J 0.5 U 0.5 U 0.5 U Arsenic 7440-38-2 D - 150 - - 1L 0.42 J 0.16 J 0.32 J 0.38 J Arsenic 7440-38-2 T - 10 - 10 1L 0.35 J 0.58 0.35 J 1.9 Barium 7440-39-3 D - - - - 1L - 27 72 50 46 Barium 7440-39-3 T - 200000 700 1L - 33 120 53 86 Beryllium 7440-41-7 D - 6.5 - 1L - 0.2 U 0.2 U 0.2 U 0.2 U Beryllium 7440-41-7 T - - 4 fL - 0.2 U 0.21 0.2 U 0.25 Boron 7440-42-8 D - - - - 1L - 50 U 39 J 130 160 Boron 7440-42-8 T - - 700 1L - 28 J+ 38 J 130 J+ 160 Cadmium 7440-43-9 D - 0.15 - 1L - 0.08 U 0.08 U 0.08 U 0.08 U Cadmium 7440-43-9 T - - - 2 1L - 0.08 U 0.08 U 0.08 U 0.05 J Calcium 7440-70-2 1 T - - - 1L - 14700 30800 19000 19800 Chromium 7440-47-3 D 11 - 1L - 0.44 J 0.33 J 0.32 J 0.2 J Chromium 7440-47-3 T - - 10 1L - 0.22 J 2 0.25 J 0.93 Cobalt 7440-48-4 D - - - /L - 0.32 J 0.31 J 1.4 0.63 Cobalt 7440-484 T 4 - 1 /L - 0.34 J 4.6 1.5 3.6 Copper 7440-50-8 D 2.7 - - 1L - 0.88 J 7.5 0.45 J 7.3 Copper 7440-50-8 T - - 1000 IL - 0.95 J 3.8 0.49 J 2.4 Iron 7439-89-6 D - - - 1L - - 50 U - 100 Iron 7439-89-6 T - - 300 1L - - 5200 - 9900 Lead 7439-92-1 D 0.54 - - /L - 0.12 0.78 0.1 U 0.76 Lead 7439-92-1 T - 15 1L - 0.09 J 1.6 0.092 J 2.5 Magnesium 7439-95-4 T - - 1L - 2210 11700 12200 13300 Manganese 7439-96-5 D - - IL - 83 250 2100 1000 Manganese 7439-96-5 T - 50 1L - 160 1400 2200 1500 Mercury 7439-97-6 T 0.012 1 1L - 0.000623 0.011 0,000684 0.0425 Methane 74-82-8 N - - IL - 8 J+ 2.6 J+ 23.7 30.5 Molybdenum 7439-98-7 D - - - 1L - 1.5 0.47 J 0.36 J 0.33 J Molybdenum 7439-98-7 T 2000 - 1L - 1.4 0.5 U OX J 0.15 J Nickel 7440-02-0 D 16 - 1L - 0.54 1 1.7 1.3 Nickel 7440-02-0 T - 100 1L - 0.7 3.7 1.9 2.6 Potassium 7440-09-7 T - - 1L - 4750 J 12200 5000 U 5000 U Selenium 7782-49-2 ❑ - - 1L - 0.85 0.5 U 0.5 U 0.5 U Selenium 7782-49-2 T 5 20 1L - 0.5 U 0.5 U 0.5 U 0.5 U Sodium 7440-23-5 T - - - 1L - 11100 12200 19400 21000 Strontium 7440-24-6 ❑ - - - 1L - 65 160 240 230 Strontium 7440-24-6 T - 40000 - 1L - 68 170 250 270 Thallium 7440-28-0 D - - - 1L - 0.091 J 0.1 U 0.1 U 0.1 U Thallium 7440-28-0 T - 0.47 0.2 1L - 0.025 J 0.1 U 0.036 J 0.026 J Vanadium 7440-62-2 D - - - 1L - 0.56 J 0.49 J 1 U 1 U Vanadium 7440-62-2 T - 0.3 1L - d.55 J 3.3 0.29 J 2.6 Zinc 7440-66-6 D 36 - 1L - 10 U 5.3 J 6.8 J 5 J Zinc 7440-66-6 T - - 1000 IL - 10 U 33 5 J 36 Total Dissolved Solids TDS N - - 500000 fL - 112000 177000 186000 185000 Total Organic Carbon TOC N - - - 1L - 6000 2500 12500 2700 Total Suspended Solids TSS N - - - 1L - 4200 U 183000 2500 U 363000 Alkalinity, CO3 ALK-0O3 N - - - 1L - 5000 U 5000 U 5000 U 5000 UJ Alkalinity, HCO3 ALK-HCO3 N - - - 1L - 22300 117000 70900 82000 Alkalinity, lab ALK-LAB N - - - 1L - 22300 117000 70900 82000 Chloride 16887-00-61 N 230000 - 250000 1L - 16400 7000 12600 14000 Nitrogen, NO2 plus NO3 NO2-NO3 N - - - - wq1L - 22 300 170 110 Sulfate 14808-79-8 N - - - 250000 1L - 22900 15400 38400 46000 Sulfide 18496-25-8 N - - - 1L - 100 U 100 U 100 U 100 U Arsenic 7440-38-2 T 10 - 10 1L - - 0.5 U - 0.203 J Chromium 7440-47-3 T - - 10 /L - - 1.54 J+ - 1.54 J+ Page 1 of 2 Table 2-13 NCDEQ Sample Location Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NameIID: CCSW001 CCSW001 CCSWO02OUT DRRC001 DRRC001 Round 1 Round 1 Round 2 Round 1 Round 2 7/1/2015 7/1/2015 911412015 71112015 911412015 FD N N N N CCSW001-DUP CCSW001 DR-CCSW0020UT-NS-3Q1 5 DRRC001 DR-DRRC001 -NS-3Q1 5 Constituent CAS RN Fraction SWQS Criteria NCDEQ 02B GWQS Criteria NCDEQ 02L Unit Iron 7439-89-6 T - 300 IL - - 266 J+ 2210 J Manganese 7439-96-5 D - - IL - - 249 J 1100 J Manganese 7439-96-5 T - - 50 IL - - 417 J - 1220 J As III 7784-46-5 T - - - IL 0.2 U 0.2 U 0.5 U 0.24 0.325 J+ As V 10103-60-3 T - - IL 0.2 U 0.2 U 0.5 U 0.2 U 0.5 U Chromium VI 18540-29-9 T - - 0.07 IL 0.041 0.056 0.14 0.05 UJ 0.0093 J Fe II 1345-25-1 T - - - IL 23 J 7 J 30 UJ 213 25.5 J+ Fe III 1309-37-1 T - - - /L 74.9 J 103 J - 253 - Mn II 1344-43-0 T - - IL 62.9 71.1 - 2470 - Mn IV 1313-13-9 T - - - /L 62.1 J 49.5 J - 0.74 - Se IV 10102-18-8 T - - - - IL 0.5 U 0.5 U 2 U 0.5 U 2 U Se VI 13410-01-0 T - - - IL 0.5 U 0.5 U 2 U 0.5 U 2 U Dissolved Oxygen DO N - - m 1L - 4.65 7A 3.89 5.12 Temperature TEMP N - - - - Deg C - 29.7 18.5 23 18.6 H PH N 6 1 9 6.5 8.5 SU - 8.05 7.5 7.2 7.4 Turbidity, field TURB N - - - - NTU - 5A7 130.2 4.21 115.E Specific Conductivity field Sc N - - S/= - 170.3 269.9 287 257.1 Oxidation Reduction Potential ORP N - - _ - mV - 200.3 101.5 102.3 -92.8 Notes: pg/L = micrograms per liter pSlcm = microsiemens per centimeter It = feet mV = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 2 of 2 Table 2-4 Ash Basin Water Analytical Results - Round 1 and Round 2 Location: Event: Sample Date: Sample Type Code: Sample Name11D: SW-1 SW-1 SW-9 SW-9 Round i Round 2 Round 1 Round 2 512712015 9/11/2015 512712015 9111/2015 N N N N MAI DR-SW-I-NS-3015 SW-9 DR-SW-9-NS-3015 Constituent CAS RN Fractio SWQS Criteria NCDEQ 02B GWQS Criteria NCDEQ 02L Unit Alurninurn 7429-90-5 D - u 11 43 100 U 5 U 100 U Aluminum 7429-90-5 T 87 u ll 613 100 U 129 360 Antimony 74,40-36-0 ❑ - u !1 1.02 1.1 1 U 0.58 Antimony 7440-36-0 T 640 1 u /I 1.21 0.97 1 U 0,72 Arsenic 7440-38-2 D 150 u 11 13.8 31.8 46.3 59 Arsenic 7440-38-2 T 10 10 u 11 15.5 37.9 51.1 75.9 Barium 7440-39-3 D u 11 20 110 88 92 Barium 7440-39-3 T 200000 700 u 11 18 120 99 120 Beryllium 7440-41-7 D 6.5 - u 11 1 U 0.2 U 1 U 0.2 U Beryllium 7440-41-7 T - 4 u 11 1 1 U 0.2 U 1 U 0.11 J Boron 7440-42-8 D - u 11 180 180 360 380 Boron 7440-42-8 T - 1 700 u II 157 190 364 400 Cadmium 744043-9 ❑ 0.15 - u 11 1 U 0.08 U 1 U 0.08 U Cadmium 7440-43-9 T - 2 u II 1 U 0.08 U 1 U 0,08 U Calcium 7440-70-2 T - u 11 19700 20800 45400 51600 Chromium 7440-47-3 ❑ 11 - u 11 1 U 0.25 J 1 U 0.45 J Chromium 744047-3 T 10 u 11 1 U 0.26 J 1 U 1 Cobalt 7440-48-4 D - - u 11 1 U 0.5 U 1 U 0.5 U Cobalt 74,40-48-4 T 4 1 u 11 1 U 0,22 J 1 U 0,74 Copper 7440-50-8 D 2.7 - u 11 3.39 J+ 0,52 J 1 U 0,23 J Copper 7440-50-8 T 1000 u 11 4.75 0.3 J 5.11 J+ 1.7 Iron 7439-89-6 D - u 11 21 50 U 10 U 50 U Iron 7439-89-6 T - 300 u 11 323 220 140 00 Lead 7439-92-1 ❑ 0.54 - u 11 1 U 0,22 1 U 0.1 U Lead 7439-92-1 T 15 u 11 1 U 0.06 J 1 U 0.83 Magnesium 7439-95.4 T - - u 11 7240 6680 13500 14300 Manganese 7439-96-5 ❑ u 11 16 59 35 5 U Manganese 7439-96-5 T - 50 u 11 9 140 154 230 Mercury 7439-97-6 T 0.012 1 u 11 0,0011 J+ 0.00778 0.000949 J+ 0.0011 J+ Methane 74-82-8 N' - u 11 10 UJ 15 10 UJ 164 Molybdenum 7439-98-7 D ug11 9.11 10.8 7.62 9.4 Molybdenum 7439-98-7 T 2000 u 11 9,36 9,7 7.65 9,8 Nickel 7440-02-0 D 16 - u 11 1.2 1.6 1 U 0.7 Nickel 7440-02-0 T - 100 u 11 2.5 1,6 1,16 1.6 Potassium 7440-09-7 T - u /I 3090 5540 4690 5840 Selenium 7782-49-2 D - - u II 2,32 1.9 1 U 0.36 J Selenium 778249-2 T 5 20 u 11 2.87 2 1 U 0.45 J Sodium 7440-23-5 T - - u II 11500 8890 17000 18700 Strontium 7440-24-6 D u 11 322 290 883 1000 Strontium 7440-24-6 T 40000 u 11 320 300 895 1100 Thallium 7440-28-0 D - u 11 0.2 U 0.021 J 0.2 U 0,017 J Thallium 7440-28-0 T - 0,47 0.2 u 11 0.2 U 0.019 J 0.2 U 0.035 J Vanadium 74,40-62-2 D - - u 11 4.94 2.4 0.701 1.1 Vanadium 7440-62-2 T - - 0.3 u 11 6,65 2.5 0.947 2.7 Zinc 7440-66-6 D 36 - u 11 34 J+ 10 U 18 J+ 10 U Zinc 7440-66-6 T 1000 u 11 212 10 U 10 16 Total Dissolved Solids TDS N 500000 u /I 140000 136000 270000 290000 Total Organic Carbon TOC IN - u 11 3800 4500 2100 1600 Total Suspended Solids TSS N u 11 16000 3500 32000 35200 Alkalinity. CO3 ALK-0O3 IN u 11 11000 5000 U 10000 U 5000 U Alkalinity, HCO3 ALK-HCO3 N u 11 23000 45400 100000 114000 Alkalinity, lab ALK-LAB N - - u 11 37000 45400 100000 114000 Chloride 16887-00-6 N - 230000 250000 u /l 11000 8900 13000 14500 Nitrite as N 14797-65-0 N - 1000 u 11 29 - 132 - Nitro en, NO2 plus NO3 NO2-NO3 N - u /I - - - 210 J- Sulfate 14808-79-8 N 250000 u 11 53000 40200 90000 90300 Sulfide 18496-25-8 IN - u 11 100 U 100 U 100 U 100 U Dissolved Oxygen DO N' - mg/1 2.5 - 7,8 Temperature TEMP N - - - Deg C 27.4 28.5 H PH N 6 9 6.5 1 8.5 SU 7.3 7,6 Turbidity, field TURB N NTU 5.61 17.9 Spec is Conductivity field SG I N - pSlom 2191 11 453,9 Oxidation Reduction Potential ORP I N - - mV 125.7 1 - 90.3 Page 1 of 2 Table 2-4 Ash Basin Water Analytical Results - Round 1 and Round 2 Location: Event: Sample Date: Sample Type Code: Sample Name1ID: SW-1 SW-1 SW-9 SW-9 Round i Round 2 Round 1 Round 2 512712015 9/11/2015 512712015 9111/2015 N N N N SW-1 DR-SW-I-NS-3015 SW-9 DR-SW-9-NS-3015 Constituent CAS RN I Fractio I SWQS Criteria NCDEQ 028 I GWQS Criteria I NCDEQ 02L I Unit Notes: pm = micron pg1L = micrograms per liter pS1cm = microsiemens per centimeter ft = feet mg1L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCVL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC, 02B .0211 and .0216 (amended effective January 2015) 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 2 of 2 Table 2-5 Background Groundwater Analytical Results - Rounds 1, 2, 3, and 4 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: BG-1D BG-1D BG-5D BG-5D BG-5D BG-50 8G-5S BG-5S Round 3 Round 4 Round 1 Round 2 Round 3 Round 4 Round 1 Round 2 1111612015 1211512015 612312015 9/912015 1111612015 17J1512015 6124/2015 9/9/2015 N N N N N N N N DR-BG-ID-NS-4015-1 Df7-BG-ID-NS-4015-2 BG-5D DR-BG-SD-NS-3015 DR-BG-5D-NS-4015-1 DR-BG•5D-NS-4Q15-2 BG-5S DR-BG•5S-NS-30115 Constituent CAS RN Fraction Criteria Min (range only) NCDEQ 02L GWQS, IMACs, DHHS Criteria Source Unit Aluminum 7429-90-5 D IL 1600 700 100 U 100 U 100 U 100 U 100 U 100 U Aluminum 7429-90-5 T pWL 1000 760 60 J 220 100 U 100 U 590 720 Antimony 7440-36-0 D PqfL 0.3 J 0.46 J 0.5 U 0.50 U 0.5 U 0.5 U 0.5 U 0.50 U Antimony 7440-36-0 T 1 IMAC P91L 0.46 J 0.6 0.5 U 0.50 U 0.5 U 0.5 U 0.5 U 0.50 U Arsenic 7440-38-2 D L 2A 2.2 0.17 J+ 0.50 U 0.5 J 0.5 U 0.5 U 0.50 U Arsenic 7440-38-2 T 10 02L pWL 2A 2.3 0.5 U 0.50 U 0.5 U 0.5 U 0.28 J 029 J Barium 7440-39-3 D 3 J 5 U 24 19 17 15 10 12 Barium 7440-39-3 T 700 02L P91L 5 U 5 U 29 22 16 16 21 22 Beryllium 7440-41-7 D L 0.2 U 0.2 U 0.15 J 0.20 U 0.2 U 0.2 U 0.2 U 0.20 U Beryllium 7440-41-7 T 4 IMAC PWIL 0.2 U 0.2 U 0.2 U 0,20 U 0.2 U 0.2 U 0.087 J 0.20 U Boron 7440-42-8 D L 58 65 50 U 50 U 50 U 50 U 50 U 50 U Boron 7440-42-8 T 700 02L IL 69 58 50 U 50 U 50 U 50 U 50 U 50 U Cadmium 7440-43-9 D L 0.08 U 0.08 U 0.032 J+ 0.080 U 0.08 U 0.08 U 0.08 U 0.080 U Cadmium 7440-43-9 T 2 02L PWL 0.08 J 0.08 U 0.08 U 0.080 U 0.08 U 0.08 U 0.08 U 0.080 U Calcium 7440-70-2 T PPJL 66800 63600 32400 30700 25600 28300 17100 21000 Chromium 7440-47-3 D - PWIL 20.4 14.7 0.28 J+ 0.60 U 0.72 J+ 0.29 J 1.2 J+ 0.29 J Chromium 7440-47-3 T 10 02L P91L 25.3 16.1 0.38 J+ 0.47 J 0.48 J+ 0.18 J+ 2.6 0.89 Cobalt 744048 1 D - L 0.32 J 0.3 J 0.91 0.30 J 0.5 U 0.6 U 0.5 U 0-60 U Cobalt 7440-48-4 T 1 IMAC L 0.38 J 0.33 J 1 0.41 J 0.5 U D.5 U 2.1 0.91 Copper 7440-50-8 D L 1 3.8 J+ 3A 0.36 J+ 0.47 J 9.8 J+ 9.4 0.28 J+ 0.39 J Copper 7440-50-8 T 1000 02L uaWfL 2.6 2.3 J+ 1 U 0.36 J 1 U 1 U 2 J+ 0.45 J Iron 7439-89-6 D - l 50 U 50 U 150 220 50 U 50 U 50 U 50 U Iron 7439-89-6 T 300 02L L 31 J 50 U 240 510 81 50 U 890 1100 Lead 7439-92-1 D - L 0.058 J+ 0.19 0.1 U 0.049 J 12 J+ 1 0.1 UJ 0.10 U Lead 7439-92-1 T 15 021- PqJL 0.1 U 0.047 J+ 0.078 J 0,27 0.08 J 0.055 J 1.7 0.76 Magnesium 7439-96 4 T - P91L 74.7 J 237 17400 16700 14900 15900 11500 14000 Manganese 7439-96-5 D pgfL 5 U 5 U 920 540 110 120 21 20 Manganese 7439-96-5 T 50 02L u L 1 5 U 5 U 910 580 100 130 110 120 Mercu 7439-97-6 D L 0.2 U 0.2 U 0.2 J 0.20 U 0.2 U 0.2 U 0.2 U 0.20 U Mercury 7439-97-6 T 1 02L l 02 U 0.2 U 0.2 J 0.20 U 02 U 0.2 U 0.2 U 0.20 U Methane 74-82-8 N P91L 2.2 J+ 1.5 J+ 5.4 J+ 10.0 UJ 1.4 J+ 2.3 J+ 3.6 J+ 1.4 J+ Molybdenum 7439-98-7 D P91L 13.2 14.9 1.2 0.58 0.32 J 0.15 J 0.5 U 0.50 U Molybdenum 7439-98-7 T pgfL 18 16.5 1.2 0.55 0.3 J 0.5 U 0.11 J 0.50 U Nickel 7440-02-0 D - L 0.18 J 0.37 J 2.3 J+ 0.17 J 0.46 J 0.39 J 0.8 J+ 0.42 J Nickel 7440-02-0 T 100 02L ucUL 0.4 J 1.9 J+ 0.52 J+ 0.36 J 0.24 J 0.5 U 2.4 J+ 1.1 Potassium 7440-09-7 T - IL 6500 6360 3170 J 5000 U 5000 U 5000 U 6000 U 5000 U Selenium 7782-49-2 D pWL 0.88 0.88 0.5 U 0.50 U 0.5 U 0.5 U 0.5 J 0.50 U Selenium 7782-49-2 T 20 02L P91L 1.2 0:9 0.5 U 0.50 U 0.5 U 0.5 U 0.5 J 0.50 U Sodium 7440-23-5 T 32400 32900 15700 16400 16500 16700 16000 17900 Strontium 7440-24-6 D l 120 98 250 270 260 230 200 230 Strontium 7440-24-6 T PQIL 100 110 300 280 230 250 220 240 Thallium 7440-28-0 D - L 0.1 U 0.1 U 0.1 U 0.10 U 0.1 U 0.1 U 0.1 U 0.10 U Thallium 7440-28-0 T 0.2 IMAC KVIL 0.017 J 0.017 J 0.1 U 0.10 U 0.1 U 0.1 U 0.019 J 0.10 U Vanadium 7440-62-2 D L 39.3 46.1 1 U 1.0 U 1 U 1 U 1 U 1.0 U Vanadium 7440-62-2 T 0.3 IMAC P91L 45.6 43 1 U 0.46 J 1 U 1 U 2.6 0.62 J Zinc 7440-66-6 D - lJQjL 12 10 U 10 U 3.1 J 10 U 10 U 10 UJ 5.5 J Zinc 7440-66-6 T 1000 02L pc#L 10 U 10 J+ 10 u 10 U 3.3 J+ 6.1 5.1 J+ 5.1 J Total Dissolved Solids TDS N 500000 021- IL 1 309000 338000 214000 212000 164000 204000 175000 191000 Total Organic Carbon TOC N l- 1 1800 2000 620 J 1000 U 10DO U 23800 570 J 1000 U Total Suspended Solids TSS N PWL 2500 U 10800 2900 5200 2500 U 2500 U - 62900 Alkalinity, CO3 ALK-CO3 N PPJL 81600 85000 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 ALK-HCO3 N l 74200 5000 U 133000 126000 115000 125000 77600 80800 Alkalinity, lab ALK-CAB N L 156000 117000 133000 126000 115000 125000 77600 80800 Chloride 16887-00-6 N 250000 02L l 6400 6600 5700 5400 6000 6000 6900 6700 Nitrite as N 14797-65-0 N 1000 02L L Nitrogen, NO2 plus NO3 NO2-NO3 N - pcSL 310 300 26 J+ 140 180 120 400 J+ 360 Sulfate 14808-79-8 N 250000 02L pg1L 86800 92400 39400 34900 34500 343DO 41300 38700 Sulfide 18496-25-8 N - L 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Arsenic 7440-38-2 T 10 021- Iron 7439-89-6 T 300 02L h L - - - - Man anese 7439-96-5 D L Manganese 7439-96-5 T 50 02L L - - - - As III 7784-46-5 T uoll- As(V)10103-60-3 T L - - - - - Chromium VI 18540-29-9 T 0.07 DHHS P91L 24.9 16.9 0.024 J+ 0.03 J Fe II 1345-25-1 T - L - - - - - Fe III 1309-37-1 T L Mn It 1344-43-0 T l - - - I - Page 1 of 8 Table 2-5 Background Groundwater Analytical Results - Rounds 1, 2, 3, and 4 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: BG-1D BG-1D BG-5D BG-5D BG-5D BG-50 8G-5S BG-5S Round 3 Round 4 Round 1 Round 2 Round 3 Round 4 Round 1 Round 2 1111612015 1211512015 612312015 9/912015 1111612015 17d1512015 6124/2015 9/9/2015 N N N N N N N N DR-BG-ID-NS-4015-1 DR-BG-ID-NS-4015-2 BG-5D DR-BG-SD-NS-3015 DR-BG-5D-NS-4015-1 DR-BG•5D-NS-4Q15-2 BG-5S DR-BG•5S-NS-30115 Constituent CAS RN Fraction Criteria Min (range only) NCDEQ 02L GWQS, IMACs, DHHS Criteria Source Unit Mn IV 1313-13-9 T IL Se IV 10102-18-8 T pg1L - - - Se(VI) 13410-01-0 T pgfL Uranium, Natural 7440-61-1 T PCOL - 1.13 - 0.135 J Radium-226 13982-63-3 T 9 L 0.897 1.22 Radium-228 15262-20-1 T - Ci1L - 1.46 - 3 U Uranium-233 13968-55-3 T L 0.05 U 0.05 U Uranium-234 13966-29-5 T l 0.05 U - 0.05 U Uranium-236 13982-70-2 T PWIL 0.05 U 0.05 U Dissolved Oxygen DO N m 1L 3.89 0.27 0.3 0.28 - 1 A Temperature TEMP N Deg C 13.1 18.7 21.3 16 16.8 H PH N 6.5 8.5 02L SU 11.4 7.06 7 6.69 - 6.2 Turbidity. field TURB N NTU 0.85 3.81 7 1.05 4 Specific Conductivit field SC IN S1cm 632 358 344.2 315.2 - 271.3 Oxidation Reduction Potential ORP N mV 37.3 1 218.2 -52.3 54.9 202.3 GW Depth TOC) IGW_DEPTH-TOCI N I ft 16.06 1 - 8.82 7.15 1 1022 Notes: pg1L = micrograms per liter pS1cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter m11= millivolts NTU - nephelometric turbidity units pCVL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg 0 = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 2 of 8 Table 2-5 Background Groundwater Analytical Results - Rounds 1, 2, 3, and 4 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: BG-5S 8G-5S GWA-12D GWA-12D GWA-12D GWA-12D GWA-12S GWA-125 Round 3 Round 4 Round 1 Round 2 Round 3 Round 4 Round 1 Round 2 1111612015 1211512015 6/412015 9/912015 11f1W2015 12/1512015 6/4/2015 9/11/2015 N N N N N N N N DR-BG-5S-NS-4015-1 DR-BG-5S-NS-4015-2 GWA-12D DR-GWA-I2D-NS-3015 DR-GWA-12D-NS-4015 R-GWA-I2D-NS-4Q15- GWA-12S DR-GWA-I2S-NS-3015 Constituent CAS RN Fraction Criteria Min (range only) NCDEQ 02L GWQS, IMACs, DHHS Criteria Source Unit Aluminum 7429-90-5 D IL 140 92 J 298 100 U 100 U 100 U 21 100 U Aluminum 7429-90-5 T pWL 130 100 U 5 U 81 J 100 511 190 350 Antimony 7440-36-0 D PqfL 0.5 U 0.5 U 1 U 0.16 J 0.18 J 0.5 U 1 U 0.5 U Antimony 7440-36-0 T 1 IMAC P91L 0.5 U 0,5 U 1 U 0.191 0.18 J 0.6 U 1 U 0.5 U Arsenic 7440-38-2 D L 0.5 U 0.5 U 2.54 2.3 2.1 2.1 1 U 0.14 J Arsenic 7440-38-2 T 10 02L pWL 0.5 U 0.5 U 3.71 2.7 2.2 2.2 1 U 0.16 J Barium 7440-39-3 D 11 10 23 16 22 19 53 46 Barium 7440-39-3 T 700 02L P91L 12 11 17 16 22 21 55 54 Beryllium 7440-41-7 D L 0.2 U 0.2 U 1 U 0.2 U 0.2 U O,2 U 1 U 0.2 U Beryllium 7440-41-7 T 4 IMAC PWIL 0.2 U 0.2 U 1 U O,2 U 0.2 U 0.2 U 1 U 0.2 U Boron 7440-42-8 D L 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U Boron 7440-42-8 T 700 02L IL 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U Cadmium 7440-43-9 D L 0.08 U 0.08 U 1 U 0.08 U 0.08 U 0.08 U 1 U 0.08 U Cadmium 7440-43-9 T 2 02L pWL 0.08 U 0.08 U 1 U Q08 U 0.08 U 0.08 U 1 U 0.08 U Calcium 7440-70-2 T PPJL 17600 17200 51700 54700 52000 48900 12200 10100 Chromium 7440-47-3 D L 0.54 J+ 0.62 1 U 0.23 J 0.28 J 0.17 J 1 U 0.48 J Chromium 7440-47-3 T 10 02L P91L 1 J+ 0.73 J+ 2.87 0.43 J+ 0.42 J 0.21 J 1.01 1.4 Cobalt 744048 1 D - L 0.5 U 0.5 U 1 U 0.31 J 0.16 J 0.6 U 1 U 0.24 J Cobalt 7440-48-4 T 1 IMAC L 0.5 U 0.5 U 1 U 0.35 J 0.13 J 0.5 U 1 U 0.49 J Copper 7440-50-8 D L 9.6 J+ 1,8 3.32 1 U 1 U 1 U 1 UJ 0.57 J Copper 7440-50-8 T 1000 02L uaWfL 1 U 1 U 3.9 J+ 0.52 J 0.42 J 0.26 J 1 U 1.3 Iron 7439-89-6 D - l 50 U 35 J 386 30 J 62 97 10 U 50 U Iron 7439-89-6 T 300 02L L 140 27 J 54 100 140 130 185 460 Lead 7439-92-1 D - L 1.1 J+ 0.18 1 U 0.16 0.063 J 0.1 U 1 U 0.1 U Lead 7439-92-1 T 15 021- PqJL 0.14 0.05 J 1.74 0.081 J 0.13 0.1 U 1 U 0,24 Magnesium 7439-96 4 T - P91L 11400 11300 16400 18000 16700 16200 5960 6070 Manganese 7439-96-5 D uafL 3.2 J 5 U 60 37 36 34 102 31 Manganese 7439-96-5 T 50 02L p L 1 16 5 U 49 40 J+ 37 36 150 45 Mercu 7439-97-6 D L 0.2 U 0.2 U 0.05 U 0.2 U 0.2 U 0.2 U 0.05 U 0.2 U Mercury 7439-97-6 T 1 02L l 02 U 0.2 U 0.05 U 0.2 U 02 U O.2 U 0.05 U 0.2 U Methane 74-82-8 N P91L 2.5 J+ 2.3 J+ 10 U 1.8 J+ 1.9 J+ 4.1 J+ 10 u 1.8 J+ Molybdenum 7439-98-7 D P91L 0.5 U 0.5 U 1.26 0.82 0.63 0.42 J 1 U 0.5 U Molybdenum 7439-98-7 T pgfL 0.5 U 0.5 U 1.52 0.8 0.56 0.34 J 1 U 0.11 J Nickel 7440-02-0 D - L 0.58 0.58 1 U 3 1.2 0.68 2.14 2:9 Nickel 7440-02-0 T 100 02L ucUL 0.59 0.64 3.37 3.4 0.77 0.33 J 3.09 3.4 Potassium 7440-09-7 T - IL 5000 U 5000 U 1000 5000 U 5000 U 5000 U 1690 5000 U Selenium 7782-49-2 D pWL 0.5 U 0.5 U 1 U 0.5 U 0.5 U 0.5 U 1 U 0.5 U Selenium 7782-49-2 T 20 02L PWL 0.5 U 0.5 U 1 U 0.5 U 0.5 U 0.5 U 1 U 0.5 U Sodium 7440-23-5 T 16700 16300 9470 9730 9060 8410 7920 7010 Strontium 7440-24-6 D l 210 180 533 520 580 520 140 140 Strontium 7440-24-6 T PQIL 200 200 526 520 580 560 140 140 Thallium 7440-28-0 D - L 0.1 U OA U 0.2 U 0.1 U 0.038 J 0.1 U 0.2 U 0.1 U Thallium 7440-28-0 T 0.2 IMAC KVIL 0.1 U 0.1 U 0.2 U 0.1 U 0.1 U 0.1 U 0.2 U 0.1 U Vanadium 7440-62-2 D L 1 U 1 U 2.75 3 3.7 32 0.3 U 0.7 J Vanadium 7440-62-2 T 0.3 IMAC P91L 0.31 J' 0.3 J 6.65 3.7 3.1 2.3 0.3 U 0.93 J Zinc 7440-66-6 D - IL 4.4 J 4.4 J 14 2.9 J 16 8.6 J 6 5.11 Zinc 7440-66-6 T 1000 02L pc#L 7.2 J+ 10 U 5 UJ 12 10 U 3.7 J+ 5 UJ 5.9 J Total Dissolved Solids TDS N 500000 021- IL 1 151000 187000 250000 257000 265000 261000 110000 105000 Total Organic Carbon TOC N l- 1 25800 550 J 202 J+ 1000 U 1000 U 1000 U 697 J+ 710 J Total Suspended Solids TSS N PWL 2500 U 2500 U 16000 7200 2600 U 2500 U 5000 U 3000 Alkalinity, CO3 ALK-0O3 N PPJL 5000 U 5000 U 10000 U 5000 U 5000 U 5000 U 10000 U 5000 U Alkalinity, HCO3 ALK-HCO3 N l 75100 70600 190000 196000 192000 174000 28000 11900 Alkalinity, lab ALK-CAB N L 75100 70600 190000 196000 192000 174000 28000 11900 Chloride 16887-00-6 N 250000 02L L 6800 6900 3900 3300 3700 3800 3000 1700 Nitrite as N 14797-65-0 N 1000 02L L 178 808 Nitrogen, NO2 plus NO3 NO2-NO3 N - uc#L 440 430 - 170 86 83 - 580 Sulfate 14808-79-8 N 250000 02L pg1L 37600 36700 16000 15300 18700 18500 41000 46100 Sulfide 18496-25-8 N - l 100 U 100 U 500 U 100 U 100 U 100 U 100 U 100 U Arsenic 7440-38-2 T 10 02L Iron 7439-89-6 T 300 02L p L - - - - Man anese 7439-96-5 D L Manganese 7439-96-5 T 50 02L l- - - - - As III 7784-46-5 T PqJL As V 10103-60-3 T L - - - Chromium VI 18540-29-9 T 0.07 DHHS P91L 0.36 0.41 0.021 J Fe II 1345-25-1 T - L - - - - - Fe III 1309-37-1 T L Mn It 1344-43-0 T I IL - - Page 3 of 8 Table 2-5 Background Groundwater Analytical Results - Rounds 1, 2, 3, and 4 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: BG-5S 8G-5S GWA-12D GWA-12D GWA-12D GWA-12D GWA-12S GWA-125 Round 3 Round 4 Round 1 Round 2 Round 3 Round 4 Round 1 Round 2 1111612015 1211512015 6/412015 9/912015 11/1912015 12/1512015 6/4/2015 9/11/2015 N N N N N N N N DR-BG-5S-NS-4015-1 DR-BG-5S-NS-4015-2 GWA-12D DR-GWA-I2D-NS-3015 DR-GWA-12D-NS-4015 R-GWA-I2D-NS-4Q15- GWA-12S DR-GWA-I2S-NS-3015 Constituent CAS RN Fraction Criteria Min (range only) NCDEQ 02L GWQS, IMACs, DHHS Criteria Source Unit Mn IV 1313-13-9 T IL Se IV 10102-18-8 T pg1L - - Se(VI) 13410-01-0 T pgfL Uranium, Natural 7440-61-1 T PCOL - - - - Radium-226 13982-63-3 T Ci1L Radium-228 15262-20-1 T - Ci1L - - - - Uranium-233 13968-55-3 T L Uranium-234 13966-29-5 T l - - - Uranium-236 13982-70-2 T PWIL Dissolved Oxygen DO N m 1L 0.88 0.47 0.44 0.5 1.2 4.85 5.34 Temperature TEMP N Deg C 16.1 17.7 20.7 17.8 16.6 18.3 23.4 H PH N 6.5 1 8.5 02L Su 6.2 7.47 7.4 7.4 7.6 5.45 5.6 Turbidity. field TURB N NTU 3.07 8.35 4.9 7.13 2.5 2.38 87.1 Specific Conductivity field SC N Slcm 256.4 396.7 526 385.3 371.E 151.3 257.4 Oxidation Reduction Potential ORP N mV 1 158.3 -81.4 -19.7 -69.7 -79A 321 242.7 GW Depth TOC) IGW_DEPTH-TOCI N I I I ft 1 7.2 - 34.69 - 1 19.1 - 16.76 Notes: pg/L = micrograms per liter pS1cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter m11= millivolts NTU - nephelometric turbidity units pCVL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective Ja 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg 0 = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 4 of 8 Table 2-5 Background Groundwater Analytical Results - Rounds 1, 2, 3, and 4 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: GWA-129 GWA-9D GWA-9D GWA-9D OoWA-913 GWA-9S GWA-9S GWA-95 Round 4 Round 1 Round 2 Round 3 Round 4 Round 1 Round 2 Round 3 1211812015 6115/2015 9/912015 11116/2015 12/1512016 6/19/2015 9/912015 11116/2015 N N N N N N GWA-9S N N 5R-GWA-12S-NS-40154 GWA-9D DR-GWA-9D-NS-3Q15 DR-GWA-9D-NS-4Q15.1 DR-GWA-91D-NS-4015-2 DR-GWA-9S-NS-3015 DR-GWA-9S-NS-4015-1 Constituent CAS RN Fraction Criteria Min (range only) NCDEQ 02L GWQS, IMACs, DHHS Criteria Source Unit Aluminum 7429-90-5 D IL 100 U 10 U 100 U 100 U 100 U 100 U 100 U 100 U Aluminum 7429-90-5 T l 560 1270 100 U 210 100 U 4300 630 300 Antimony 7440-36-0 D uafL 0.2 J 0.5 U 0.5 U 0.5 U 0.5 U 0.19 J 0.5 U 0.5 U Antimony 7440-36-0 T 1 IMAC P91L 0.19 J 0.5 U 0.5 U 0.5 U 0.5 U 0.22 J 0.5 U 0.6 U Arsenic 7440-38-2 D L 0.5 U 2.1 0.69 0.77 0.74 0.5 U 0.5 U 0.5 U Arsenic 7440-38-2 T 10 02L pWL 0.48 J 2.3 0.67 0.84 0,84 0.63 0.5 U 0.5 U Barium 7440-39-3 D 34 24 20 14 12 5 U 10 11 Barium 7440-39-3 T 700 02L P91L 41 23 21 15 13 42 17 14 Beryllium 7440-41-7 D L 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.077 J 0.21 0.18 J Beryllium 7440-41-7 T 4 IMAC PWIL 0.0811 0.086 J 0.2 U 0.2 U 0.2 U 0.67 0.23 0,21 Boron 7440-42-8 D L 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U Boron 7440-42-8 T 700 02L IL 50 U 50 U 50 U 38 J 50 U 50 U 50 U 50 U Cadmium 7440-43-9 D L 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.038 J 0.027 J Cadmium 7440-43-9 T 2 02L pWL 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.036 J 0.034 J 0.053 J Calcium 7440-70-2 T 7210 17700 14200 8270 7150 1050 584 835 J+ Chromium 7440-47-3 D L 0.65 J+ 025 J 0.34 J 0.5 U 0.5 U 027 J+ 0.57 0,49 J+ Chromium 7440-47-3 T 10 02L P91L 3.4 2.9 1.2 J+ 2.5 J+ 1.4 J+ 3.5 0.97 J+ 0.82 J+ Cobalt 744048 1 D - 1OWL 0-26 J 0.51 0.36 J 0.76 0.81 1.5 4.6 6.5 Cobalt 7440-48-4 T 1 IMAC P91 0.47 J 1.2 0.38 J 0.9 0.88 9.3 4.7 6.7 Copper 7440-50-8 D L 2.8 J+ 1 U 1.9 0.6 J+ 0.72 J+ 1 UJ 5 9.2 J+ Copper 7440-50-8 T 1000 02L pgfL 1.4 J+ 2.1 J+ 1 U 0.4 J 0.47 J 4.5 J+ 1.4 1.5 Iron 7439-89-6 D L 50 U 1390 1800 2000 2100 50 U 50 U 50 U Iron 7439-89-6 T 300 02L PCYL a90 3290 2000 2600 2300 5100 750 290 Lead 7439-92-1 D l 0.23 0.1 U 0.13 0.085 J+ 0.12 J+ 0.1 U 0.51 0.95 J+ Lead 7439-92-1 T 15 021- PPJL 0.35 0.67 J+ 0.1 U 0,32 0.14 4.3 0.38 0.39 Magnesium 7439-954 T - PWIL 4370 3050 2620 2260 2030 890 558 753 Manganese 7439-96-5 D PqfL 27 590 690 660 480 36 100 140 Manganese 7439-96-5 T 50 02L u L 37 640 720 620 530 220 110 140 Mercu 7439-97-6 D L 0.2 U 0.2 U 0.2 U 0.2 U 0.2'U 0.2 U 0.2 U 0.2 U Mercury 7439-97-6 T 1 02L l 02 U 0.072 J 0.2 J 0.2 U 02 U 0.073 J+ 02 U 0.2 U Methane 74-82-8 N P91L 3.2 J+ 10 U 3 J+ 2.6 J+ 1.9 J+ 2.3 J+ 2.7 J+ 1.7 J+ Molybdenum 7439-98-7 D P91L 0.5 U 0.27 J 0.12 J 0.21 J 0.5'U 0.6 U 0.5 U 0.6 U Molybdenum 7439-98-7 T pgfL 0.11 0.52 0.12 J 0.27 J 0.5 U 0.3 J 0.5 U 0.5 U Nickel 7440-02-0 D - L 2.8 1.2 J+ 0.98 2.4 2 0.66 J+ 2.9 3.1 Nickel 7440-02-0 T 100 02L L 3.7 3.2 J+ 1.2 3.7 2.5 6.1 J+ 2.9 3.9 Potassium 7440-09-7 T - IL 5000 U 5000 U 6000 U 5000 U 6000 U 5000 U 5000 U 5000 U Selenium 7782-49-2 D pWL 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium 7782-49-2 T 20 02L PWL 0.26 J 0.5 U 0.5 U 0.5 U 0.5 U 0.56 0.5 U 0.5 U Sodium 7440-23-5 T 5630 6140 5510 5000 4850 J 6980 5390 5960 Strontium 7440-24-6 D l 94 63 52 33 25 3A J 8.1 9.5 Strontium 7440-24-6 T uolL 100 64 55 31 27 21 9.1 9.3 Thallium 7440-28-0 D - L 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U Thallium 7440-28-0 T 0.2 IMAC KVIL 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.034 J 0.1 U 0.1 U Vanadium 7440-62-2 D L 0.42 J 1 U 1 U 1 U 1 U 1 U 1 U 1 U Vanadium 7440-62-2 T 0.3 IMAC P91L 2.4 J+ 1.8 1 U 0.38 J 0.39 J 61 0.59 J 0.65 J Zinc 7440-66-6 D - IL 16 3.9 J+ 10 U 8.7 J 3.1 J 5.1 J+ 12 13 Zinc 7440-66-6 T 1000 02L pc#L 6.9 J 8.9 J+ 10 U 12 J+ 16 20 16 11 J+ Total Dissolved Solids TDS N 500000 021- IL 87000 113000 91000 42000 90000 161000 50000 36000 Total Organic Carbon TOC N L 1300 1000 U 17500 1000 U 1000 U 14200 1000 U 1000 U Total Suspended Solids TSS N PWL 2500 U 16100 5000 U 5800 5900 239000 30200 6900 Alkalinity, CO3 ALK-0O3 N PPJL 5000 U 10000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 ALK-HCO3 N l 6000 57000 47600 32000 25400 9100 5700 4900 J Alkalinity, lab ALK-CAB N L 6000 57000 47600 32000 25400 9100 5700 4900 J Chloride 16887-00-6 N 250000 02L l 2700 2000 2100 2900 3100 4200 4000 4100 Nitrite as N 14797-65-0 N 1000 02L ucUL Nitrogen, NO2 plus NO3 NO2-NO3 N - PCSL 790 20 U 20 U 20 U 20 U 48 36 31 Sulfate 14808-79-8 N 250000 02L pg1L 32400 4200 4300 6000 6000 650 J 2700 6400 Sulfide 18496-25-8 N - l 100 U 500 U 100 U 100 U 100 U 100 U 100 U 100 U Arsenic 7440-38-2 T 10 021- Iron 7439-89-6 T 300 02L h L - - - Manganese 7439-96-5 D L Manganese 7439-96-5 T 50 02L L - - - - As III 7784-46-5 T As V 10103-60-3 T L - - - - - Chromium VI 18540-29-9 T 0.07 DHHS P91L 0.26 0.03 U 0.03 U 0.083 WOO 1345-25-1 T - L - - - - - Fe III 1309-37-1 T L Mn It 1344-43-0 T l - - - - Page 5 of 8 Table 2-5 Background Groundwater Analytical Results - Rounds 1, 2, 3, and 4 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: GWA-129 GWA-9D GWA-9D GWA-9D 41WA-913 GWA-9S GWA-9S GWA-9S Round 4 Round 1 Round 2 Round 3 Round 4 Round 1 Round 2 Round 3 1211812015 6115/2015 9/912015 11116/2015 12/1512016 6/19/2015 9/912015 11116/2015 N N N N N N GWA-9S N N 5R-GWA-12S-NS-40154 GWA-9D DR-GWA-9D-NS-3Q15 DR-GWA-9D-NS-4Q15.1 DR-GWA-91D-NS-4015-2 DR-GWA-9S-NS-3015 DR-GWA-9S-NS-4015-1 Constituent CAS RN Fraction Criteria Min (range only) NCDEQ 02L GWQS, IMACs, DHHS Criteria Source Unit Mn IV 1313-13-9 T IL Se IV 10102-18-8 T PCIVIL - - Se(VI) 13410-01-0 T uafL Uranium, Natural 7440-61-1 T PCOL - - - - Radium-226 13982-63-3 T CUL Radium-228 15262-20-1 T - Ci1L - - - - Uranium-233 13968-55-3 T pglL Uranium-234 13966-29-5 T l - - Uranium-236 13982-70-2 T Dissolved Oxygen DO N m 1L - 0.16 0.12 0.31 0.5 4.17 4.52 1.61 Temperature TEMP N Deg C 26.1 16.7 18.2 14.5 23.8 19 16.3 H PH N 6.5 8.5 02L Su - 6.4 _ 6.2 6.1 5.8 5.55 5.1 5.3 Turbidity. field TURB N NTU 16.28 0.9 9.97 1.9 235.9 7.2 9.24 Specific Conductivity field Sc N ps1crn - 141.9 157.4 89.6 84.4 39.3 48.1 45.2 Oxidation Reduction Potential ORP N mV 90.8 69.8 1.5 42 331.5 287 241.6 GW Depth TOC GW DEPTH -TO N ft - - 34.66 28.1 34.68 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet mg/L = milligrams per liter m11= millivolts NTU - nephelometric turbidity units pCUL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surfaee water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective Ja 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg 0 = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 6 of 8 Table 2-5 Background Groundwater Analytical Results - Rounds 1, 2, 3, and 4 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: GWA-9S MW-23BR MW-23BR MW-23BR MW-23D MW-23D Round 4 Round 1 Round 2 Round 4 Round 1 Round 4 1211512015 61112015 911012015 1211512015 613012015 1211512015 N N N N N N DR-GWA-9S-NS4015-2 MW-23BR DR-MW-23BR-NS-3015 R-MW-23BR-NS-4Q15- MW-23D DR-MW-23D-NS-4Q75-2 Constituent CAS RN Fraction Criteria Min (range only) NCDEQ 02L GWQS, IMACs, DHHS Criteria Source Unit Aluminum 7429-90-5 D IL 85 J 75 100 U 100 U 100 U 88 J Aluminum 7429-90-5 T PWL 300 8 100 U 66 J 180 100 U Antimony 7440-36-0 D uafL 0.5 U 1.16 0.50 U 0.5 U 0.5 U 0.5 U Antimony 7440-36-0 T 1 IMAC P91L 0.5 U 1.21 0.50 U 0.5 U 0.5 a 0.5 U Arsenic 7440-38-2 D L 0.5 U 6.29 1.2 0.69 0.33 J 0.3 J Arsenic 7440-38-2 T 10 02L pWL 0.5 U 6.36 1.1 0.65 0.27 J 0.33 J Barium 7440-39-3 D 11 132 120 110 94 72 Barium 7440-39-3 T 700 02L P91L 14 136 120 120 80 16 Beryllium 7440-41-7 D L 0.18 J 1 U 0.20 U 0.2 U 0.2 U 0.2 U Beryllium 7440-41-7 T 4 IMAC PWL 0.19 J 1 U 0.20 U 0.2 U 0.2 U 0.2 U Boron 7440-42-8 D L 50 'U 50 U 28 J 32 J 50 U 50 U Boron 7440-42-8 T 700 02L IL 50 U 50 U 29 J 50 U 50 U 50 U Cadmium 7440-43-9 D L 0.04 J 1 U 0.080 U 0.08 U 0.08 U 0.08 U Cadmium 7440-43-9 T 2 02L pWL 0.037 J 1 U 0.080 U Q08 U 0.08 U 0.08 U Calcium 7440-70-2 T 1130 53700 48500 54500 61100 59000 Chromium 7440-47-3 D L 0.23 J+ 1 U 0.25 J 021 J 0.22 J 0.34 J Chromium 7440-47-3 T 10 02L uoWJL 0.58 J+ 1 U 0.50 U 0.5 U 0.26 J+ 1.5 Cobalt 7440-48 1 D - PWL 6.7 1 U 0.50 U 0.5 U 0.22 J 0.181 Cobalt 7440-48-4 T 1 IMAC P91L 6.6 1 U 0.50 U 0.5 U 0.25 J 0.3 J Copper 7440-50-8 D L 7.6 J+ 1 U 1.0 U 1 U 0.27 J+ 1.4 Copper 7440-50-8 T 1000 02L PqL 1.8 8.46 1.2 0.27 J 0.88 J+ 0.87 J Iron 7439-89-6 D L 44 J 57 1100 1100 J 50 U 69 Iron 7439-89-6 T 300 02L KYL 370 138 1000 1200 J 110 48 J Lead 7439-92-1 D L 0.8 J+ 1 U 0.10 U 0.1 U 0.1 U 0.1 U Lead 7439-92-1 T 15 021- PPJL 0.25 1 U 0.10 U 0.1 U 0.057 J+ 0.24 Magnesium 7439-96 4 T L 896 18900 18900 19400 13600 13000 Manganese 7439-96-5 D pgfL 140 31 30 27 300 110 Manganese 7439-96-5 T 50 02L P91L ISO 32 29 30 280 25 Mercu 7439-97-6 D L 0.2 U 0.05 U 0.20 U 0.2 U 0.2 U 0.2 U Mercury 7439-97-6 T 1 02L IJWL 02 U 0.05 U 0.20 UJ 0.2 U 0.2 U 0.2 U Methane 74-82-8 N P91L 1.9 J+ 10 UJ 55.7 45.5 1.8 J+ 55.5 Molybdenum 7439-98-7 D P91L 0.5 U 2.51 1.6 1 A 0.57 0.48 J Molybdenum 7439-98-7 T pgfL 0.5 U 2.52 1.6 1.1 0.41 J 0.12 J Nickel 7440-02-0 D - PWL 3.7 1 U 0.50 U 0.25 J 0.47 J 1.5 Nickel 7440-02-0 T 100 02L L 3.9 1 U 0.50 U 0.47 J 0.49 J+ 1 Potassium 7440-09-7 T - IL 6000 U 654 5000 U 5000 U 5000 U 5000 U Selenium 7782-49-2 D L 0.5 U 1 U 0.50 U 0.5 U 0.5 U 0.5 U Selenium 7782-49-2 T 20 02L ucVL 0.5 U 1 U 0.50 U 0.5 U 0.5 U 0.5 U Sodium 7440-23-5 T 6460 13200 15200 14000 7300 6400 Strontium 7440-24-6 D IJQjL 13 1930 2100 1700 890 480 Strontium 7440-24-6 T PQIL 15 1940 1900 1900 740 110 Thallium 7440-28-0 D - PWL 0.1 U 0.2 U 0.10 U 0.1 U 0.1 U 0.023 J Thallium 7440-28-0 T 0.2 IMAC KYL 0.1 U 0.55 0.10 U 0.1 U 0.1 U 0.1 U Vanadium 7440-62-2 D L 1 U 1.15 1.0 U 1 U 1 U 1 U Vanadium 7440-62-2 T 0.3 IMAC L 0.74 J' 1.38 1.0 U 0.31 J 1 U 12 Zinc 7440-66-6 D - IL 10 14 IOU 19 31 4.7 J Zinc 7440-66-6 T 1000 02L L 16 7 10 U 16 J+ 27 2.6 J Total Dissolved Solids TDS N 500000 021- IL 36000 270000 266000 276000 252000 279000 Total Organic Carbon TOC N L 1000 U 148 1000 U 29000 J 520 J 1000 U Total Suspended Solids TSS N ijcOL 5900 5000 U 2500 U 2600 U 2500 U 3500 Alkalinity, CO3 ALK-0O3 N PPJL 5000 U 10000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 ALK-HCO3 N IJWL 7800 220000 203000 233000 205000 168000 Alkalinity, lab ALK-CAB N L 7800 220000 203000 J- 233000 J 205000 168000 Chloride 16887-00-6 N 250000 02L PWL 4200 3300 3800 4100 8000 J+ 5200 Nitrite as N 14797-65-0 N 1000 02L ucUL 10 U Nitrogen, NO2 plus NO3 NO2-NO3 N - pcSL 42 J+ - 20 U 20 U 20 UJ 36 Sulfate 14808-79-8 N 250000 02L pg1L 7000 12000 8400 11000 29800 27700 Sulfide 18496-25-8 N L 100 U 100 U 180 100 U 100 U 100 U Arsenic 7440-38-2 T 10 02L 0.58 0.5 U Iron 7439-89-6 T 300 02L p L - - 516 - 100 Manganese 7439-96-5 D L 31.4 193 Manganese 7439-96-5 T 50 02L L - - 322 J+ - 272 J+ As III 7784-46-5 T 0.456 J 0.2 U 0.5 U As V 10103-60-3 T L - - 0.5 U 0.203 0.5 U Chromium VI 18540-29-9 T 0.07 DHHS P91L 0.027 J 0.014 J 0489 J 1.1 Fe II 1345-25-1 T - IL - 476 J 20 U 46.6 J- Fe III 1309-37-1 T L 20 U Mn It 1344-43-0 T I IJWL - 53.4 J Page 7 of 8 Table 2-5 Background Groundwater Analytical Results - Rounds 1, 2, 3, and 4 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: GWA-9S MW-23BR MW-23BR MW-23BR MW-23D MW-23D Round 4 Round 1 Round 2 Round 4 Round 1 Round 4 1211512015 61112015 911012015 1211512015 613012015 1211512015 N N N N N N DR-GWA-9S-NS4015-2 MW-23BR DR-MW-23BR-NS-3015 R-MW-23BR-NS-4Q15- MW-23D DR-MW-23D-NS-4Q75-2 Constituent CAS RN Fraction Criteria Min (range only) NCDEQ 02L GWQS, IMACs, DHHS Criteria Source Unit Mn IV 1313-13-9 T IL 311 J Se IV 10102-18-8 T PCYL - - 2 UJ 0.5 U 2 U Se(VI) 13410-01-0 T uafL 2 UJ 0.5 UJ 2 U Uranium, Natural 7440-61-1 T PCOL - - - Radium-226 13982-63-3 T 91L Radium-228 15262-20-1 T - Ci1L - - Uranium-233 13968-55-3 T pg1L Uranium-234 13966-29-5 T PCYL - - Uranium-236 13982-70-2 T Dissolved Oxygen DO N m 1L 1.6 305 0.16 0.41 1.44 1.86 Temperature TEMP N Deg C 19.5 21.8 21.9 12.1 19.8 14.8 H PH N 6.5 8.5 02L SU 5.3 7A5 7.5 7.5 6.89 5.95 Turbidity. field TURB N NTU 8.2 0.22 6.1 1.2 51.69 9.73 Specific Conductivity field SC N pslcm 54.9 474.3 716 451.8 438.2 385.3 Oxidation Reduction Potential ORP N mV 211.3 6 -146.7 -141.6 146.5 68:8 GW Depth TOC) IGW_DEPTH-TOCI N I ft 28A9 - - - - 15.48 Notes: pg/L = micrograms per liter pS1cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCVL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surfaee water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective Ja 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg 0 = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 8 of 8 Table 2-6 Groundwater Results Upgradient of Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name11D: GWA-12D GWA-12D GWA-12S GWA-12S GWA-6S GWA-70 GWA-7D Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 2 30-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 6/4/2015 91912015 6/412015 9111/2015 9/1212015 6/16/2015 911012015 N N N N N N N GWA-12D DR-GWA-12D-NS-3015 GWA-12S DR-GWA-I2S-NS-3015 DR-GWA-6S-NS-3015 GWA-71D DR-GWA-7D-NS-3Q15 Constituent Fractio CAS RN Criteria Min Groundwate Criteria Onit Aluminum D 7429-90-5 NS p IL 298 100 U 21 100 U 100 U 9.1 J 100 U Aluminum T 7429-90-5 AS 1L 5 U 81 J 190 350 220 117 130 Antimony D 7440-36-0 NS p IL 1 U 0.16 J 1 U 0.5 U 0.5 U 0.5 U 0.2 J Antimony T 7440-36-0 - 1 IMAC p 1L 1 U 0.19 J 1 U 0.5 U 0.5 U 0.5 U 0.2 J Arsenic D 7440-38-2 NS p IL 2.54 2.3 1 U 0.14 J 3A 0.5 U 0.5 U Arsenic T 7440-38-2 -- 10 02L p 1L 3.71 2.7 1 U 0,16 J 2.9 0.13 J 0.5 lJ Barium D 7440-39-3 NS 1L 23 16 53 46 210 23 19 Barium T 7440-39-3 700 02L 1L 17 16 55 54 220 24 19 Beryllium D 744041-7 NS p 1L 1 U 0.2 U 1 U 0.2 U 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p 1L 1 U 0.2 U 1 U 0.2 U 0.2 U 0.2 U 0.2 U Boron D 744042-8 NS p 1L 50 U 50 U 50 U 50 U 710 50 U 50 U Boron T 7440-42-8 700 02L p 1L 50 U 50 U 50 U 50 U 700 50 UJ 50 U Cadmium D 744043-9 NS p IL 1 U 0.08 U 1 U 0.08 U 0.08 U 0.08 U 0.08 U Cadmium T 7440-43-9 - 2 02L p 1L 1 U 0.08 U 1 U 0,08 U 0.08 U 0.08 U 0.08 U Calcium T 7440-70-2 NS 1L 51700 54700 12200 10100 83000 26900 22800 Chromium D 7440-47-3 -- NS p 1L 1 U 0.23 J 1 U 0,48 J 0,45 J 0.25 J+ 1.3 Chromium T 744047-3 10 02L p IL 2.87 0.43 J+ 1.01 1.4 0,75 J+ 0.51 J+ 0.54 J+ Cobalt D 7440-48-4 - NS 1L 1 U 0.31 J 1 U 0,24 J 1.6 2.8 2.7 Cobalt T 7440484 1 IMAC p 1L 1 U 0.35 J 1 U 0,49 J 1.8 2.8 2.8 Copper D 7440-50-8 NS 1L 3,32 1 U 1 UJ 0,57 J 0.29 J 0,22 J+ 1 U Copper T 7440-50-8 1000 02L p IL 3.9 J+ 0.52 J 1 U 1.3 0.39 J 0.39 J+ 0.25 J+ Iron D 7439-89-6 NS p 1L 386 30 J IOU 50 U 13600 1390 1700 Iron T 7439-89-6 300 02L p IL 54 100 185 460 15200 1610 1800 Lead D 7439-92-1 NS p 1L 1 U 0.16 1 U 0.1 U 0.1 U 0,1 UJ 0,063 J Lead T 7439-92-1 15 02L p IL 1,74 0.081 J 1 U 0,24 0.077 J 0.13 J+ 0.11 Magnesium T 7439-95-4 NS p 1L 1 16400 18000 5960 6070 12500 13300 12900 Manganese D 7439-96-5 NS p IL 60 37 102 31 3700 1100 960 Manganese T 7439-96-5 50 02L p IL 49 40 J+ 150 45 3800 1000 910 Mercury D 7439-97-6 NS p 1L 0.05 U 0.2 U 0.05 U 0.2 U 0.2 U 0.2 UJ 0.2 U Mercury T 7439-97-6 1 02L p 1L 0.05 U 0.2 U 0,05 U 0.2 U 0.2 U 0.2 UJ 0.2 UJ Methane N 74-82-8 NS p IL 10 U 1.8 J+ 10 U 1.8 J+ 2740 IOU 1.8 J Molybdenum D 7439-98-7 -- NS I p 1L 1.26 0,82 1 U 0.5 U 8.6 0.14 J 0.5 U Molybdenum T 7439-98-7 NS p IL 1,52 0.8 1 U 0.11 J 8 0.111 0.5 U Nickel D 7440-02 0 - NS 1L 1 U 3 2,14 2.9 1.8 1.4 J+ 1.7 Nickel T 7440-02-0 100 02L 1L 3.37 3A 3.09 3.4 1.9 2.1 J+ 1.3 J+ Potassium T 7440-09-7 NS p IL 1000 5000 U 1690 5000 U 10700 5000 U 5000 U Selenium D 7782-49-2 NS p IL 1 U 0.5 U 1 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p 1L 1 U 0.5 U 1 U 0.5 U 0.5 U 0.5 U 0.5 U Sodium T 7440-23-5 NS p 1L 9470 9730 7920 7010 26200 25900 22900 Strontium D 7440-24-6 NS p 1L 533 520 140 140 680 290 290 Strontium T 7440-24-6 NS p IL 526 520 140 140 710 290 280 Thallium D 7440-28-0 NS p 1L 0.2 U 0.1 U 0.2 U 0.1 U 0.1 U 0,1 UJ 0.1 U Thallium T 7440-28-0 0.2 IMAC p 1L 0.2 U 0.1 U 0.2 U 0.1 U 0,1 UJ 0,1 UJ 0A U Vanadium D 7440-62-2 NS p 1L 2.75 3 03 U 0.7 J 1.2 1 U 1 U Vanadium T 7440-62-2 0.3 IMAC p IL 5.65 3.7 0.3 U 0.93 J 1.1 0.3 J 1 U Zinc D 7440-66-6 NS p 1L 1 14 2.9 J 6 5.1 J 13 2.6 J 12 Zinc T 7440-66-6 1000 02L p IL 5 UJ 12 5 UJ 5.9 J 4.8 J 3.5 J 10 J+ Total Dissolved Solid N TDS 500000 02L p 1L 250000 257000 110000 105000 340000 242000 233000 Total Organic Carbor N TOC NS p IL 202 J+ 1000 U 697 J+ 710 J 7800 590 J 1000 U Total Suspended Sol N TSS - NS 1L 16000 7200 5000 U 3000 371000 4300 5000 U Alkalinity, CO3 N ALK-0O3 -- NS p IL 10000 U 5000 U 10000 U 5000 U 5000 UJ 10000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 - NS p IL 190000 196000 28000 11900 317000 59000 53900 Alkalinity, lab N ALK-LAB -- NS p IL 190000 196000 28000 11900 317000 59000 53900 Chloride N 16887-00-6 - 250000 02L I p 1L 3900 3300 3000 1700 18900 3000 3000 Nitrite as N N 14797-65-0 1000 02L p 1L 178 808 Nitrogen, NO2 plus lN N NO2-NO3 NS p 1L 170 580 16 J- 20 U 20 U Sulfate N 14808-79-8 250000 02L p IL 16000 15300 41000 46100 2300 98200 98600 Sulfide N 18496-25-8 - NS p 1L 500 U 100 L! 100 U 100 U 100 U 100 U 100 lJ As Ill T 778446-5 NS p 1L As V T 10103-60-3 NS p 1L Chromium (VI) T 18540-29-9 0.07 DHHS p IL Fe(II) T 1345-25-1 NS p 1L Fe(III) T 1309-37-1 NS p IL Mn(II) T 1344-43-0 NS p 1L Mn(IV) T 1313-13-9 NS p 1L Se lV T 10102-18-8 NS I L Se(VI) T 13410-41-0 NS p IL Uranium, Natural I T 7440-61-1 NS p 1L Page 1 of 8 Table 2-6 Groundwater Results Upgradient of Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: GWA-12D GWA-12D GWA-12S GWA-12S GWA-6S GWA-70 GWA-71) Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 2 30-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 6/4/2015 91912015 6/412015 9111/2015 9/1212015 6/16/2015 911012015 N N N N N N N GWA-12D DR-GWA-I2D.NS-3015 GWA-12S DR-GWA-I2S-NS-3015 DR-GWA-6S-NS-3015 GWA-71) DR-GWA-7D-NS-3Q15 Constituent Fractio CAS RN Criteria Min Groundwate Criteria Unit Radium-226 T 13982-63-3 NS pCiIL Radium 228 T 15262-20-1 NS pCiIL Uranium-233 T 13968-55-3 NS p IL Uranium-234 T 13966-29-5 NS p 1L Uranium-236 T 13982-70-2 NS p IL Dissolved Oxygen N 1 DO NS I m 1L 0.47 0,44 4,85 5,34 0.2 2,21 0.2 Temp Celcius N TEMP NS Deg C 17.7 20.7 18.3 23.4 21.1 29.8 22.9 pH field N PH 6.5 8.5 02L SU 1 7.47 1 7.4 11 6.45 5.6 1 6.8 1 6.01 +6.2 Turbidity, field N TURB NS NTU 8.35 4.9 2.38 87.1 140.2 8,58 9.3 Spec. Cond. field N SC NS pS1cm 396.7 526 151.3 257.4 687 353.2 252.1 Oxidation Reduction N GRP NS mV -81 A -19.7 321 242.7 -92.1 129 -74.6 GW Depth TOC N GW,_DEPTH-TOq NS ft 33,28 16,76 19.7 20.5 Notes: pg1L = micrograms per liter pS1cm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCiIL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 2 of 8 Table 2-6 Groundwater Results Upgradient of Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NamellD: GWA-7S GWA-7S GWA-8D GWA-8D GWA-8S GWA-91) GWA-91) Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 6/19/2015 9/10/2015 61512015 91912015 6/1812015 611512015 919/2015 N N N N N N N GWA-7S DR-GWA-7S-NS-3015 GWA-81) DR-GWA-8D-NS-3Q15 GWA-8S N WG 20150619 GWA-91) DR-GWA-9D-NS-3Q15 Constituent Fractio CAS RN Criteria Min Groundwate Criteria Unit Aluminum D 7429-90-5 NS µgrL 420 730 6A J 100 U 100 U 10 U 100 U Aluminum T 7429-90-5 NS p IL 600 850 769 300 150 1270 100 U Antimony D 7440-36-0 NS p IL 0.5 U 0.63 0.6 0.5 U 0.22 J 0.5 U 0.5 U Antimony T 7440-36-0 - 1 IMAC p IL 0.23 J 0,6 0.71 0,5 U 0.16 J 0.5 U 0.5 U Arsenic D 7440-38-2 -- NS p IL 0.5 U 0.5 U 1.2 0.98 0.6 2.1 0,69 Arsenic T 7440-38-2 - 10 02L p IL 0.5 U 0.5 U 1A 0.86 0,57 2.3 0,67 Barium D 7440-39-3 -- NS p IL 25 32 29 32 19 24 20 Barium T 7440-39-3 700 02L p IL 28 33 34 34 19 23 21 Be lium D 744041-7 NS p IL 4.7 6.7 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 3,7 7.7 0.2 U 0.2 U 0,2 U 0,085 J 0.2 U Boron D 744042-8 NS p IL 38 J+ 50 U 50 U 50 U 39 J+ 50 U 50 U Boron T 7440-42-8 700 02L p IL 50 U 50 U 50 U 50 U 34 J 50 U 50 U Cadmium D 744043-9 NS p IL 0.46 0.42 0.08 U 0.08 U 0,081 0.08 U 0.08 U Cadmium T 7440-43-9 2 02L p 1L 1 0.37 0.43 0,027 J 0,08 UJ 0.08 U 0.08 U 0.08 U Calcium T 7440-70-2 NS p IL 25800 23500 130000 124000 39600 17700 14200 Chromium D 7440-47-3 NS p IL 0.95 J+ 0.87 0.9 J+ 1.1 0,46 J 0.25 J 0,34 J Chromium T 744047-3 10 02L p IL 1.9 2 J+ 3.2 3.4 J+ 0.95 2.9 1.2 J+ Cobalt D 7440-48-4 -- NS 1L 19.2 13A 0,14 J 0.5 U 8.6 0.51 0,36 J Cobalt T 7440484 1 IMAC p 1L 17.7 14.6 0,26 J 0.19 J 9.7 1.2 0.38 J Copper D 7440-50-8 NS p 1L 1 UJ 2A 5 J+ 0,32 J 0.37 J 1 U 1,9 Copper T 7440-50-8 1000 02L p IL 1.2 J+ 2.4 J+ 1.7 J+ 0.88 J+ 0.42 J 2.1 J+ 1 U Iron D 7439-89-6 NS p IL 50 U 50 U 50 U 140 50 U 1390 1800 Iron T 7439-89-6 300 02L p IL 310 61 413 420 190 3290 2000 Lead D 7439-92-1 NS p IL 0.1 U 0.056 J 0,46 0,1 U' 0.1 U 0.1 U 0.13 Lead T 7439-92-1 15 02L p IL 0.18 J+ 0.095 J 0,81 0.37 J+ 0.068 J 0.67 J+ 0.1 U Magnesium T 7439-95-4 NS IL 18600 18000 29200 34200 24800 3050 2620 Manganese D 7439-96-5 NS p IL 1000 1100 1000 1600 2700 590 690 Manganese T 7439-96-5 50 02L p IL 950 1200 1200 1700 1700 640 720 Mercury D 7439-97-6 NS p IL 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L p IL 0,085 J+ 0.2 UJ 0.2 U 0.2 U 0.2 U 0,072 J 0.2'U Methane N 74-82-8 NS p IL 1:9 J+ 2A J 28 8.8 J+ 6.6 J+ 10 U 3 J+ Molybdenum D 7439-98-7 -- NS p IL 0.5 U 0.2 J 3,1 2A 0,73 0.27 J 0,12 J Molybdenum T 7439-98-7 NS p IL 0,14 J 0,16 J 3A 2.3 0,73 0,52 0.12 J Nickel D 7440-02-0 - NS IL 51.1 39,6 0.51 J+ 0,81 6.1 1.2 J+ 0,98 Nickel T 7440-02-0 100 02L 1L 46.9 42 1.4 J+ 1.8 J+ 5A 3.2 J+ 1.2 Potassium T 7440-09-7 NS p 1L 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Selenium D 7782-49-2 NS p IL 0.62 0,84 0.69 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p IL 0.86 0,88 11 0.5 U 0.5 U 0.5 U 0.5 U Sodium T 7440-23-5 NS p IL 18700 21400 29900 32900 40400 6140 5510 Strontium D 7440-24-6 NS p IL 780 710 630 730 460 63 52 Strontium T 7440-24-6 NS p IL 800 740 700 760 420 64 55 Thallium D 7440-28-0 NS p IL 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC p IL 0.1 U 0.1 U 0.018 J 0.1 U CA U 0.1 U 0.1 U Vanadium ❑ 7440-62-2 NS p IL 1 U 0.4 J 3.2 0.41 J 1 UJ 1 U 1 U Vanadium T 7440-62-2 0,3 IMAC p IL 0.38 J 1 U 5.2 1.3 0.45 J 1.8 1 U Zinc D 7440-66-6 NS p IL 560 490 10 U 10 U 7.8 J 3,9 J+ 101.1 Zinc T 7440-66-6 1000 02L p IL 390 500 3.4 J+ 10 UJ 13 8.9 J+ IOU Total Dissolved So[id N TDS 500000 02L p IL 318000 287000 690000 J- 726000 397000 113000 91000 Total Organic Carbor N TOC NS p IL 980 J 750 J 1100 970 J 1200 1000 U 17500 Total Suspended Sol N TSS - NS p IL 38000 3000 13000 J+ 6700 18900 16100 5000 U Alkalinity, CO3 N ALK-0O3 -- NS p IL 5000 U 5000 U 10000 U 5000 U 5000 U 10000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 -- NS p IL 1 5500 2100 J 120000 129000 61800 57000 47600 Alkalinity, lab N ALK-LAB -- NS p IL 5500 2100 J 120000 129000 61800 57000 47600 Chloride N 16587-00-6 - 250000 1 02L p IL 2400 3000 4700 4000 5500 2000 2100 Nitrite as N N 14797-65-0 -- 1000 02L p IL Nitrogen, NO2 plus IN N NO2-NO3 NS p IL 370 1100 20 U 20 U 20 U 20 U 20 U Sulfate N 14808-79-8 250000 02L p IL 176000 170000 368000 346000 181000 4200 4300 Sulfide N 18496-25-8 NS p IL 100 U 100 U 500 U 100 U 100 U 500 U 100 U As(III) T 778446-5 NS p IL As V T 10103-60-3 NS p IL Chromium VI T 18540-29-9 0.07 DHHS p IL Fe II T 1345-25-1 NS p IL Fe(III) T 1309-37-1 NS p IL Mn(II) T 1344-43-0 NS p IL Mn(IV) T 1313-13-9 NS p IL Se IV T 10102-18-8 NS I p IL Se(VI) T 13410-01-0 NS p IL Uranium, Natural I T 1 7440-61-1 1 NS p IL Page 3 of 8 Table 2-6 Groundwater Results Upgradient of Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: GWA-7S GWA-7S GWA-8D GWA-8D GWA-8S GWA-913 GWA-91) Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 6/19/2015 9/10/2015 61512015 91912015 6/1812015 611512015 919/2015 N N N N N N N GWA-7S DR-GWA-7S-NS-3015 GWA-80 DR-GWA-8D-NS-3Q15 GWA-8S N WG 20150619 GWA-90 1)R-GWA-9D-NS-3Q15 Constituent Fractio CAS RN Criteria Min Groundwate Criteria Unit Radium-226 T 13982-63-3 NS pCiIL Radium 228 T 15262-20-1 NS pCi1L Uranium-233 T 13968-55-3 NS p 1L Uranium-234 T 13966-29-5 NS p 1L Uranium-236 T 13982-70-2 NS p 1L Dissolved Oxygen N I DO NS I m 1L 4.89 2.1 3.46 0.95 0.16 0,12 Temp Celcius N TEMP NS Deg C 25 30.1 23.6 19 26.1 16.7 H field N PH 6.5 8.5 02L SU 5.39 4.9 7.81 I 7.35 6A 6.2 Turbidity, field N TURB -- NS NTU 9 6.6 9,74 17.1 16,28 0.9 Spec. Cond. field N SC NS pS1cm 394.9 419.6 839 950 141.9 157A Oxidation Reduction N GRP NS mV 342.9 24.9 78.9 -75 90.8 69.8 GW Depth TOC N GW,-DEPTH-TOq NS ft 19.21 34.68 Notes: pg1L = micrograms per liter pS1cm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCiIL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 4 of 8 Table 2-6 Groundwater Results Upgradient of Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NamellD: GWA-9S GWA-9S MW-12 MW-12 MW-12D MW-121) MW-20D Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 6/19/2015 919/2015 6/2012015 91912015 6/2012015 91912015 6/24/2015 N N N N N N N GWA-9S DR-GWA-9S-NS-3015 MW-12 DR-MW-12-NS-3Q15 MW-12D DR-MW-12D•NS-3Q15 MW-20D Constituent Fractio CAS RN Criteria Min Groundwate Criteria Unit Aluminum D 7429-90-5 NS µgrL 100 U 100 U 100 U 100 U 100 U 100 U 100 U Aluminum T 7429-90-5 NS p IL 4300 630 990 180 960 59 J 130 Antimony D 7440-36-0 NS p IL 0,19 J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Antimony T 7440-36-0 - 1 IMAC p IL 0.22 J 0.5 U 0,18 J 0,5 U 0.5 U 0.5 U 0.5 U Arsenic D 7440-38-2 -- NS p IL 0.5 U 0.5 U 0.42 J 0.38 J 0.44 J 0.35 J 0.58 Arsenic T 7440-38-2 - 10 02L p IL 0.63 0.5 U 0.71 0.28 J 0.44 J 0.24 J 0,91 Barium D 7440-39-3 -- NS p IL 5 U 10 5.8 5A 20 19 56 Barium T 7440-39-3 700 02L p IL 1 42 17 10 6,7 29 21 66 Beryllium D 744041-7 NS p IL 0.077 J 0,21 0.11 J 0.11 J 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 0.67 0,23 0,22 0,14 J 0.11 J 0.2 U 0.2 U Boron D 744042-8 NS p IL 50 U 50 U 33 J+ 50 U 50 U 50 U 26 J Boron T 7440-42-8 700 02L p IL 50 U 50 U 50 U 50 U 50 U 50 U 35 J Cadmium D 744043-9 NS p IL 0.08 U 0,038 J 0.074 J 0.08 U 0.052 J 0.08 U 0.08 U Cadmium T 7440-43-9 2 02L p 1L 0.036 J 0,034 J 0.05 J 0,052 J 0.08 U 0.08 U 0.08 U Calcium T 7440-70-2 NS p IL 1050 584 2440 3200 12800 12700 43400 Chromium D 7440-47-3 NS p IL 0.27 J+ 0,57 0,41 J+ 0,18 J 0.2 J+ 0.48 J 0.5 UJ Chromium T 744047-3 10 02L p IL 3.5 0.97 J+ 2.6 J+ 0,59 J+ 1.4 J+ 0,52 J+ 0.47 J Cobalt D 7440-48-4 -- NS 1L 1.5 4.5 9.9 9,3 4,5 4.3 0.5 U Cobalt T 7440484 1 IMAC p 1L 9.3 4.7 10+1 8.9 4.8 4.6 0.5 U Copper D 7440-50-8 NS p 1L 1 UJ 5 3.1 J+ 2.9 0.25 J+ 0,53 J 1 U Copper T 7440-50-8 1000 02L p IL 4.5 J+ 1.4 10.6 3.2 1.7 J+ 0.38 J 1 U Iron D 7439-89-6 NS p IL 50 U 50 U 1900 2400 4800 4500 50 U Iron T 7439-89-6 300 02L p IL 5100 750 3600 2900 6100 4900 200 Lead D 7439-92-1 NS p IL 0.1 U 0.51 0,11 J+ 0.19 01 U 0.1 U 0.1 U Lead T 7439-92-1 15 02L p IL 4.3 0,38 4.5 1.4 0.51 0.087 J 0,094 J Magnesium T 7439-95-4 NS IL 890 558 4680 5090 8110 7860 11000 Manganese D 7439-96-5 NS p IL 36 100 440 450 1300 1300 470 Manganese T 7439-96-5 50 02L p IL 220 110 450 470 1400 1400 Soo Mercury D 7439-97-6 NS p IL 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L p IL 0,073 J+ 0.2 U 0.072 J+ 0.2 U 0,2 U 0.2 U 0.2 U Methane N 74-82-8 NS p IL 2.3 J+ 2.7 J+ 3.4 J+ 4.9 J+ 2.3 J+ 2.9 J+ 12.8 Molybdenum D 7439-98-7 -- NS p IL 0.5 U 0.5 U 0.15 J 0.1 J 0.16 J 0,11 J 0,22 J Molybdenum T 7439-98-7 NS p IL 0.3 J 0.5 U 0.2 J 0,15 J 0.2 J 0.15 J 0.22 J Nickel D 7440-02-0 - NS IL 0.66 J+ 2.9 93 9A 5 4.8 0,5 U Nickel T 7440-02-0 100 02L 1L 6.1 J+ 2.9 11.2 9.8 5.7 5.2 0.19 J Potassium T 7440-09-7 NS p 1L 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 1 5000 U Selenium D 7782-49-2 NS p IL 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 1 0.5 U Selenium T 7782-49-2 20 02L p IL 0.56 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Sodium T 7440-23-5 NS p IL 6980 5390 4970 J 5490 13100 11200 10600 Strontium D 7440-24-6 NS p IL 3.1 J 8.1 9.2 11 46 51 460 Strontium T 7440-24-6 NS p IL 21 9.1 10 12 51 53 520 Thallium D 7440-28-0 NS p IL 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC p IL 0.034 J CA U 0.017 J 0,019 J 0.1 U 0.1 U 0.1 U Vanadium ❑ 7440-62-2 NS p IL 1 U 1 U 1 U 1 U 1 U 1 U 1 U Vanadium T 7440-62-2 0.3 IMAC p IL 5.1 0.59 J 2.6 1 U 1.4 1 U 0.41 J Zinc D 7440-66-6 NS p IL 5.1 J+ 12 90 84 12 J+ 17 10 UJ Zinc T 7440-66-6 1000 02L p IL 20 16 92 86 16 18 10 UJ Total Dissolved So[id N TDS 500000 02L p IL 161000 50000 72000 69000 168000 145000 187000 Total Organic Carbor N TOC NS p IL 14200 1000 U 1000 U 1000 U 1000 U 1000 U 1000 U Total Suspended Sol N TSS - NS p IL 239000 30200 76300 24200 120000 6900 5500 Alkalinity, CO3 N ALK-0O3 -- NS p IL 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 -- NS p IL 9100 5700 17200 22100 62500 54700 158000 Alkalinity, lab N ALK-LAB -- NS p IL 9100 5700 17200 22100 62500 54700 158000 Chloride N 16587-00-6 - 250000 02L p IL 4200 4000 5900 6000 9400 8900 1 4200 Nitrite as N N 14797-65-0 -- 1000 02L p IL Nitrogen, NO2 plus N NO2-NO3 NS p IL 48 36 20 U 20 U 20 UJ 20 U 12 J Sulfate N 14808-79-8 250000 02L p IL 650 J 2700 10200 9900 25400 23200 5700 Sulfide N 18496-25-8 NS p IL 100 U 100 U 100 U 100 U 100 U 100 U 100 U As(III) T 778446-5 NS p IL As V T 10103-60-3 NS p IL Chromium VI T 18540-29-9 0.07 DHHS p IL Fe II T 1345-25-1 NS p IL Fe(III) T 1309-37-1 NS p IL Mn(II) T 1344-43-0 NS p IL Mn(IV) T 1313-13-9 NS p IL Se IV T 10102-18-8 NS p IL Se(VI) T 13410-01-0 NS p IL Uranium, Natural T 7440-61-1 NS p IL Page 5 of 8 Table 2-6 Groundwater Results Upgradient of Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: GWA-9S GWA-9S MW-12 MW-12 MW-12D MW-121) MW-20D Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 6/19/2015 919/2015 6/2012015 91912015 6/2012015 91912015 6/24/2015 N N N N N N N GWA-9S DR-GWA-9S-NS-3015 MW-12 DR-MW-I2-NS-3Q15 MW-12❑ DR-MW-12D•NS-3Q15 MW-20D Constituent Fractio CAS RN Criteria Min Groundwate Criteria Unit Radium-226 T 13982-63-3 NS pCiIL Radium 228 T 15262-20-1 NS pCi1L Uranium-233 T 13968-55-3 NS p 1L Uranium-234 T 13966-29-5 NS p 1L Uranium-236 T 13982-70-2 NS p 1L Dissolved Oxygen N I DO NS I m 1L 4.17 4.52 0.25 0.2 0.25 0.2 0,49 Temp Celcius N TEMP NS Deg C 23.8 19 19.4 18.5 23.7 19.9 16.8 H field N PH 6.5 8.5 02L SU 1 6.55 5.1 5.58 5.6 6.18 6.1 7.44 Turbidity, field N TURB -- NS NTU 235.9 7.2 51.04 8.2 29.71 4,89 9A7 Spec. Cond. field N SC NS pS1cm 39.3 48.1 58.3 101.7 1 210.5 214.5 322 Oxidation Reduction N GRP NS mV 331.5 287 166.3 -48.2 64.5 -54.4 22 GW Depth TOC N GW,-DEPTH-TOq NS ft 32,68 23.35 22.64 Notes: pg1L = micrograms per liter pS1cm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCiIL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended 02L = North Carolina groundwater standards as specified in T16A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 6 of 8 Table 2-6 Groundwater Results Upgradient of Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NamellD: MW-20S OW-31OD Round 1 (CSA Sampling) Round 2 3Q-2015 612412015 9111/2015 N N MW-20S DR-OW-31D'D-NS-3Q15 Constituent Fractio CAS RN Criteria Min Groundwate Criteria Unit Aluminum D 7429-90-5 NS µgrL 100 U 100 U Aluminum T 7429-90-5 NS p IL 100 U 800 Antimony D 7440-36-0 NS p IL 0.5 U 0.28 J Antimony T 7440-36-0 - 1 IMAC p IL 0.5 U 0,25 J Arsenic D 7440-38-2 -- NS p IL 0.58 777 Arsenic T 7440-38-2 - 10 02L p IL 0.63 782 Barium D 7440-39-3 -- NS p IL 12 380 Barium T 7440-39-3 700 02L p IL 13 410 Be lium D 744041-7 NS p IL 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 0.2 U 0.12 J Boron D 744042-8 NS p IL 50 U 980 Boron T 7440-42-8 700 02L I p IL 50 U 980 Cadmium D 744043-9 NS p IL 0.08 U 0.08 U Cadmium T 7440-43-9 2 02L p 1L 0.08 U 0,08 U Calcium T 7440-70-2 NS p IL 15300 95200 Chromium D 7440-47-3 NS p IL 0.24 J+ 0,21 J Chromium T 744047-3 10 02L p IL 0.22 J 0.95 J+ Cobalt D 7440-48-4 -- NS 1L 2.2 1.4 Cobalt T 7440484 1 IMAC p 1L 2.1 1.9 Copper D 7440-50-8 NS p 1L 1 1 U 1 U Copper T 7440-50-8 1000 02L p IL 1 U 1.7 J+ Iron D 7439-89-6 NS p IL 2500 2200 Iron T 7439-89-6 300 02L p IL 2800 3500 Lead D 7439-92-1 NS p IL 0.1 U 0.1 U Lead T 7439-92-1 15 02L p IL 0.1 U 0.71 Magnesium T 7439-95-4 NS IL 10500 13500 Manganese D 7439-96-5 NS p IL 840 1400 Manganese T 7439-96-5 50 02L p IL 820 1600 Mercury D 7439-97-6 NS p IL 0.2 U 0.2 U Mercury T 7439-97-6 1 02L p IL 0.2 U 0.2 U Methane N 74-82-8 NS p IL 79.2 816 Molybdenum D 7439-98-7 -- NS p IL 0,22 J 45.9 Molybdenum T 7439-98-7 NS p IL 0,18 J 43 Nickel D 7440-02-0 - NS IL 0.92 2.2 Nickel T 7440-02-0 100 02L 1L 0.87 2.6 J+ Potassium T 7440-09-7 NS p 1L 5000 U 7810 Selenium D 7782-49-2 NS p IL 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p IL 0.5 U 0.5 U Sodium T 7440-23-5 NS p IL 9640 20000 Strontium D 7440-24-6 NS p IL 120 2600 Strontium T 7440-24-6 NS p IL 130 2600 Thallium D 7440-28-0 NS p IL 0.1 U 0.091 J Thallium T 7440-28-0 0.2 IMAC p IL 0.1 U 0.14 J+ Vanadium ❑ 7440-62-2 NS p IL 1 U 1.6 Vanadium T 7440-62-2 0.3 IMAC p IL 1 U 3.2 Zinc D 7440-66-6 NS p IL 2.8 J+ 12 Zinc T 7440-66-6 1000 02L p IL 60 3.4 J Total Dissolved Solid N TDS 500000 02L p IL 121000 383000 Total Organic Carbor N TOC NS p IL 690 J 1000 U Total Suspended Sol N TSS - NS p IL 3000 6600 Alkalinity, CO3 N ALK-0O3 -- NS p IL 5000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 -- NS p IL 68300 283000 Alkalinity, lab N ALK-LAB -- NS p IL 68300 283000 Chloride N 16587-00-6 - 250000 02L p IL 20800 19100 Nitrite as N N 14797-65-0 -- 1000 02L p IL Nitrogen, NO2 plus N NO2-NO3 NS p IL 1 20 U 20 U Sulfate N 14808-79-8 250000 02L p IL 3800 26400 Sulfide N 18496-25-8 NS p IL 100 U 100 U As(III) T 77a446-5 NS p IL As V T 10103-60-3 NS p IL Chromium VI T 18540-29-9 0.07 DHHS p IL Fell T 1345-25-1 NS I p IL Fe(III) T 1309-37-1 NS p IL Mn(II) T 1344-43-0 NS p IL Mn(IV) T 1313-13-9 NS p IL Se IV T 10102-18-8 1 NS p IL Se(VI) T 13410-01-0 NS p IL Uranium, Natural T 7440-61-1 NS p IL Page 7 of 8 Table 2-6 Groundwater Results Upgradient of Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: MW-20S OW-31OD Round 1 (CSA Sampling) Round 2 3Q-2015 612412015 9111/2015 N N MW-20S DR-0W-31D'D-NS-3Q15 Constituent Fractio CAS RN Criteria Min Groundwate Criteria Unit Radium-226 T 13982-63-3 NS pCiIL Radium 228 T 15262-20-1 NS pCi1L Uranium-233 T 13968-55-3 NS p 1L Uranium-234 T 13966-29-5 NS p 1L Uranium-236 T 13982-70-2 NS p 1L Dissolved Oxygen N I DO NS I m 1L 0.81 Temp Celcius N TEMP NS Deg C 23.6 H field N PH 6.5 8.5 02L SU 7.1 Turbidity, field N TURB -- NS NTU 5.82 Spec. Cond. field N SC NS pSlcm 483.9 Oxidation Reduction N GRP NS mV -133.3 GW Depth TOC N GW,-DEPTH-TOq NS ft Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter It = feet my = millivolts NTU - nephelometric turbidity units pCiIL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended 02L = North Carolina groundwater standards as specified in T16A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 8 of 8 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: AB-10D AB-1pD AB-25BR AB-25BR AB-25D AB-25D AS-30BR Round i (CSA Sampling) Round 2 3Q-2015 Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 612412015 9111/2015 6126/2015 9111/2015 6/26/2015 9/12/2015 6124/2015 N N N N N N N AS-10D DR-AB-100-NS-3015 AB-25BR DR-AB-25BR-NS-3015 AB-25D DR-AB-25D-NS-3015 AB-308R Constituent Fractlon GAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS 1L 74 J 100 U 100 U 100 U 52 J 100 U 100 U Aluminum T 7429-90-5 NS 1L 290 430 100 U 85 J 170 360 280 Antimony ❑ 7440-36-0 NS 1L 8.8 15 1 0.86 1.6 0.5 U 0.5 U Antimony T 7440-36-0 1 IMAC p 1L 1.9 1.4 1 0.45 J 1.7 0.2 J 0.5 U Arsenic ❑ 7440-38-2 NS 1L 0.66 0.41 J 2.4 1.6 0.31 J 0.25 J 0.82 Arsenic T 7440-38-2 10 02L p 1L 0.68 0.51 J+ 2.6 1 0.45 J 0.38 J 0,83 Barium D 7440-39-3 NS 1L 37 310 19 30 16 26 82 Barium T 7440-39-3 700 02L 1L 290 400 21 35 20 29 99 Beryllium D 744041-7 NS 1L 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p 1L 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Boron D 744042-8 NS p 1L 250 240 190 270 820 930 300 Boron T 7440-42-8 700 02L p 1L 290 230 180 260 840 830 320 Cadmium D 744043-9 NS p 1L 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U Cadmium T 7440-43-9 2 02L 1L 0,08 U 0,08 U 0,08 U 0.08 U O.026 J 0.08 U 0.08 U Calcium T 7440-70-2 NS 1L 60800 J- 88700 33200 40500 29300 35600 J- 69700 Chromium D 7440-47-3 NS 1L 5.5 3A 4A 0.49 J 0.19 J+ 0,33 J+ 0,86 J+ Chromium T 744047-3 10 02L p 1L 4A 6A 30.1 13.4 0.96 2.9 J+ 2.2 J+ Cobalt D 7440-48-4 NS 1L 0.96 1.1 0.5 U 0.5 U 0.25 J 0,34 J+ 0.5 U Cobalt T 744048-4 1 IMAC p IL 1.1 1.9 0.27 J 0.24 J 0.3 J 0.78 0.29 J Copper D 7440-50-8 NS 1L 1.5 J+ 5.3 0,41 J+ 0.48 J 0,28 J+ 1.3 J+ 1.2 J+ Copper T 7440-50-8 1000 02L IL 2A J+ 1.9 1.6 2.5 J+ 0.36 J 0.77 J+ 2.5 J+ Iron D 7439-89-6 NS 1L 50 U 50 UJ 50 U 50 U 50 U 50 U 77 Iron T 7439-89-6 300 02L p 1L 34 J 43 J 150 150 93 330 490 Lead D 7439-92-1 NS 1L 0.1 UJ 1 0.1 UJ 0,074 J 0.1 UJ 0.13 J+ 0,14 J+ Lead T 7439-92-1 15 02L 1L 0.13 1.2 0.086 J OA9 0.17 0.52 J+ 0.28 Magnesium T 7439-95-4 NS 1L 10900 3060 6090 8390 10500 13400 10900 Manganese D 7439-96-5 NS IL 5 U 5 U 4.1 J 52 190 510 350 Manganese T 7439-96-5 50 02L p 1L 26 13 7.8 59 180 550 370 Mercury ❑ 7439-97-6 NS 1L 0.2 U 0.2 U 0.2 U 0.2 J 0.2 U 0.2 UJ 0.2 U Mercury T 7439-97-6 1 02L 1L 0.2 U 0.2 UJ 0.2 U 0.2 UJ 0.2 U 0.2 U 0.2 U Methane N 74-82-8 NS 1L 31.5 J+ 38.6 J 8.6 J+ 6.6 J+ 4.2 J+ 3.5 J+ 34.5 J+ Molybdenum D 7439-98-7 NS 1L 2A 2.1 7A 5.5 12.6 11.4 2.3 Molybdenum T 7439-98-7 NS p 1L 1.6 2.4 8.3 3.4 13 11.6 2.4 Nickel D 7440-02-0 NS 1L 1.8 J+ 1.7 1.2 J+ 1.7 2.3 3 J+ 1.4 J+ Nickel T 7440-02-0 100 02L 1L 1.6 J+ 2.3 15A 7.3 2.9 4.8 J+ 2.5 J+ Potassium T 7440-09-7 NS 1L 68800 J- 93800 5000 U 5000 U 5000 U 5000 U 5000 U Selenium D 778249-2 NS p 1L 0,38 J 0,35 J 0.67 0.44 J 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p 1L 0,22 J 0,47 J 0,64 0,23 J 0.5 U 0.5 U 0.5 U Sodium T 7440-23-5 NS 1L 42000 58200 43700 35500 32300 24300 14200 Strontium D 7440-24-6 NS 1L 730 3400 380 530 160 160 680 Strontium T 7440-24-6 NS 1L 2900 3900 410 570 180 170 740 Thallium D 7440-28-0 NS 1L 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U O.1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC p IL 0.1 U 0.02 J 0.1 U OA UJ O:023 J 0.1 U 0.1 U Vanadium D 7440-62-2 NS 1L 2.9 0.96 J 5.1 3.2 0.56 J 0.45 J 1 U Vanadium T 7440-62-2 0.3 IMAC p IL 1.5 0.63 J 5.5 1.7 0.69 J 0.64 J 0+91 J Zinc D 7440-66-6 NS 1L 10 UJ 10 U 1O U 10 U 10 U 27 J+ 10 UJ Zinc T 7440-66.6 1000 02L p IL 10 UJ 7.2 J 10 U 2.8 J 3.6 J 38 12 J+ Total Dissolved Solids N TDS 500000 02L p 1L 272000 1320000 296000 289000 258000 247000 327000 Total Organic Carbon N TOC NS 1L 28400 1200 1200 960 J 1000 U 10700 1000 U Total Suspended Solids N TSS - NS 1L 80400 2500 U 10100 5000 22400 12100 Alkalinity, CO3 Ni ALK-CO3 NS p 1L 10000 5000 U 11500 5000 U 5000 U 5000 UJ 5000 U Alkalinity, HCO3 N ALK-HCO3 NS 1L 226000 698000 55900 66600 70800 1000 J+ 133000 Alkalinity, lab N ALK-I-AB NS 1L 236000 698000 67400 66600 70800 1000 J+ 133000 Chloride N 16887-00-6 250000 02L 1L 24900 17400 22900 23600 19800 20400 20800 Nitrite as N N 14797-65-0 - 1000 02L 1L Nitrogen, NO2 plus NO3 N NO2-NO3 NS 1L 13 J+ 20 U 20 U 20 U 12 J 20 U 20 UJ Sulfate N 14808-79-8 250000 02L p 1L 33700 19800 99000 99800 83000 84800 96700 Sulfide N 18496-25-8 NS 1L 100 U 100 U 100 U 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS 1L 0.439 0.189 As V T 10103-60-3 NS 1L 0.143 0.325 Chromium VI T 18540-29-9 0.07 DHHS p 1L 4.51 0.039 J+ Fe II T 1345-25-1 NS 1L 20 U 20 U Fe(Ill) T 1309-37-1 NS p 1L 20 UJ 20 U Mn II T 134443-0 NS /L 5 UJ 213 Mn(IV) T 1313-13-9 NS 1L 13.1 5.76 IV T 10102-18-8 NS 1L 0.5 U 0.5 U rSe Se i T 13410-01-0 NS p 1L 0.5 U 0.5 U Uranium, Natural T 1 7440-61-1 NS 1L 1.6 1.3 1.28 Page 1 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: AB-10D AB-10D AB-25611 AB-25BR AB-25D AB-25D AS-30BR Round i (CSA Sampling) Round 2 3Q-2015 Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 612412015 9111/2015 6126/2015 9111/2015 6/26/2015 9/12/2015 6124/2015 N N N N N N N AS-10D DR-AB-100-NS-3015 AB-25BR DR-AB-25BR-NS-3015 AB-25D DR-AB-25D-NS-3015 AB-308R Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCiIL 1.02 E47 0.499 J Radium-228 T 15262-20-1 NS pCi1L 2.03 J 3 U 3 U Uranium-233 T 13968-55-3 NS 1L 0.05 U 0.05 U 0.05 U Uranium-234 T 13966-29-5 NS 1L 0.05 U 0.05 U 0,05 U Uranium-236 T 13982-70-2 NS !L 0.05 U 0.05 U 0.05 U ❑ ssolved Oxygen N 00 NS m II 0,2 0.27 0.67 0.51 0,74 Temp Celsius N TEMP -- NS Deg C 22.9 23.1 24.4 22.7 23.7 H((field) N PH 6.5 8.5 02L SU 12.2 9.12 8.47 7,09 7.1 Turbidity. field N TURB NS NTU 9.4 3.31 5.13 6.11 16.71 Spec. Cond. field N SC NSPS/Cm 55B8 427 440,7 390 374,2 Oxidation Reduction. Potential N CRP NS my -197.8 155 5A 208 127.9 GW Depth TOC N IGW DEPTH -TOO NS ft 1 1 59.23 52,44 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 2 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Namel10: AB-30SR AS-30D AB-30D AB-30S AB-30S AB-35BR AB-35BR Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 9/1012015 612412015 9111/2015 612912015 9110/2015 612512015 911012015 N N N N N N N DR-AB-30BR-NS-36115 AB-30D DR-AB-30D-NS-3015 AB-30S DR-AB-30S-NS-3Q15 AB-35BR DR-AB-35BR-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS 1L 100 U 100 U 100 U 110 100 U 100 U 100 U Aluminum T 7429-90-5 NS 1L 270 94 J 250 130 J 3400 190 75 J Antimony D 7440-36-0 NS 1L 0.5 U 2 0.43 J 0.5 UJ 0.5 U 0.51 0.5 U Antimony T 744036--0 1 IMAC p 1L 0,5 U 1.5 0.9 2.6 J 0,5 U 0.48 J 0.5 U Arsenic D 7440-38-2 NS 1L 0.78 0.46 J 0.35 J 0.5 UJ 0.5 U 12 9.3 Arsenic T 7440-38-2 10 02L p IL 0.94 0,41 J 0.41 J+ 0.5 U 0.96 11.7 10.5 J Barium D 7440-39-3 NS 1L 110 82 91 120 110 210 370 Barium T 7440-39-3 700 02L IL 100 110 95 130 160 240 360 Beryllium D 744041-7 NS 1L 0.2 U 0.2 U 0.2 U 0.2 UJ 0.44 0.2 U 0,2 U Beryllium T 7440-41-7 4 IMAC p 1L 0,2 U 0,2 U 0.2 U 0,45 0.84 0,2 U 0.2 U Boron D 744042-8 NS p 1L 310 240 290 300 320 270 220 Boron T 7440-42-8 700 02L p 1L 300 250 270 290 310 270 240 Cadmium D 744043-9 NS p 1L 0.08 U 0,08 U 0.08 U 0,08 UJ 0.064 J 0,08 U 0.08 U Cadmium T 7440-43-9 2 02L fL 0,08 U 0,08 U 0.08 U 0,086 0,075 J 0,08 U 0.08 U Calcium T 7440-70-2 NS 1L 70400 52300 57200 8580 5720 84300 79000 Chromium D 7440-47-3 NS IL 0,21 J 2 J+ 0,75 0,78 J+ 0.2 J 1.5 J+ 0,55 Chromium T 744047-3 10 02L p IL 1.7 2.7 3.3 0.99 J+ 10.4 3.8 2.3 J Cobalt D 7440-48-4 NS IL 0.5 U 0,18 J 0,27 J 0.5 UJ 24.9 0,24 J 0.5 U Cobalt T 744048-4 1 IMAC p IL 0.23 J 0.3 J 0.44 J 29 30.7 0.26 J 0.14 J Copper D 7440-50-8 NS IL 1 U 4.5 J+ 0,57 J 2.2 J+ 0,98 J 1.7 J+ 1 U Copper T 7440-50-8 1000 02L IL 0.91 J 0,71 J+ 1.9 0.97 J+ 7.9 3.3 J+ 0.86 J Iron D 7439-89-6 NS 1L 94 50 U 50 J 39 J 33 J 50 U 50 U Iron T 7439-89-6 300 02L p 1L 460 97 380 1101 4200 150 93 J Lead D 7439-92-1 NS fL 0.1 U 0,051 J+ 0.1 0.1 UJ 0.39 0,062 J+ 0.1 U Lead T 7439-92-1 15 02L 1L 0.18 0.14 0.29 0.44 J+ 5.1 0.16 0.12 Magnesium T 7439-95-4 NS IL 11900 7830 9230 5360 4040 14700 13000 Manganese D 7439-96-5 NS IL 400 280 380 1600 1400 390 150 Manganese T 7439-96-5 50 02L p 1L 380 430 360 1500 1100 410 220 Mercury ❑ 7439-97-6 NS 1L 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L 1L 0.15 J 0.2 U 0,2 UJ 0.2 U 0,12 J 0.2 U 0.2 U Methane N 74-82-8 NS 1L 40 23.5 J+ 20.5 15.8 J+ 16.5 J+ 20.2 J+ 22.3 J Molybdenum D 7439-98-7 NS IL 2,9 2.8 1.3 0.5 U 0.5 U 20 21,3 Molybdenum T 7439-98-7 NS p 1L 3.2 2.5 1.9 0.5 U 0.29 J 21.4 19.9 J Nickel D 7440-02-0 NS 1L 0,85 1.5 J+ 13 0,38 J+ 7.8 1.1 J+ 0.77 Nickel T 7440-02-0 100 02L 1L 1.8 1.9 J+ 2.7 8.6 J+ 11.7 IA J+ 1.4 J Potassium T 7440-09-7 NS 1L 5000 U 5000 U 5000 U 5000 U 5000 U 13500 14200 Selenium D 778249-2 NS p 1L 0.5 U 0.28 J 0.5 U 0.5 U 0,5 U 0.32 J 0,5 U Selenium T 7782-49-2 20 02L p /L 0,5 U 0,5 U 0.31 J 0.5 U 0.24 J 0,67 0.5 U Sodium T 7440-23-5 NS 1L 15900 13800 15400 29400 29600 34400 158000 Strontium D 7440-24-6 NS 1L 870 340 420 150 150 550 730 Strontium T 7440-24-6 NS 1L 770 400 450 150 110 650 690 Thallium D 7440-28-0 NS 1L 0,1 U 0,1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC p IL 0.1 U 0.1 U 0,1 U 0.02 J 0.093 J 0.1 U 0.1 U Vanadium D 7440-62-2 NS IL 1 U 0.96 J 0.57 J 1 UJ 1 U 0.99 J 1.5 Vanadium T 7440-62-2 0.3 IMAC p 1L 0.67 J 0.86 J 1.1 1 U 18.3 1.8 1.8 J Zinc D 7440-66-6 NS 1L 10 U 3 J+ 21 15 J+ 58 4.4 J 10 U Zinc T 7440-66-6 1000 02L p IL 20 4 J+ 43 13 J+ 32 9.6 J+ 3.7 J Total Dissolved Solids N TDS 500000 02L p IL 377000 249000 304000 183000 174000 410000 9050001 Total Organic Carbon N TOC NS 1L 21000 1000 U 1000 U 650 J 760 J 12900 198000 J Total Suspended Solids N TSS - NS 1L 14300 2500 U 37600 2500 U 69400 13300 68000 J Alkalinity, CO3 Ni ALK-CO3 NS p 1L 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS 1L 133000 90900 87800 6200 3600 J 187000 197000 Alkalinity, lab N ALK-LAB NS 1L 133000 90900 J- 1 87800 6200 3600 J 187000 197000 Chloride N 16887-00-6 250000 02L IL 18000 22100 21900 10200 10400 18800 33600 J Nitrite as N N 14797-65-0 -- 1000 02L p 1L Nitrogen, NO2 plus NO3 N NO2-NO3 NS 1L 20 U 13 J+ 20 U 20 UJ 20 U 17 J+ 20 U Sulfate N 14808-79-8 250000 02L p IL 106000 71500 79400 81500 74200 129000 195000 J Sulfide N 18496-25-8 NS /L 100 U 100 U 100 U 100 U 100 U 100 U 6500 J- As(III) T 7784-46-5 NS 1L 0.158 0.2 U 9.84 J As V T 10103-60-3 NS IL 0.12 0.2 U 0.66 Chromium VI T 18540-29-9 0.07 DHHS p 1L 1.38 0:026 J+ 0,871 J Fe II T 1345-25-1 NS 1L 10.1 119 7,3 J+ Fe(Ill) T 1309-37-1 NS p 1L 20 U 20 U 20 UJ Mn II T 134443-0 NS /L 292 1540 406 J+ Mn(IV) T 1313-13-9 NS IL 85.2 2.5 UJ 16.9 J+ IV T 10102-18-8 NS IL 0.5 U 0.5 U 0.5 U rSe Se i T 13410-01-0 NS p IL 0.5 U 0.5 U 0.5 UJ Uranium, Natural T 7440-61-1 NS 1L Page 3 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Namel10: AB-30SR AS-30D AB-30D AB-30S AB-30S AB-35BR AB-35BR Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 9/1012015 612412015 9111/2015 612912015 9110/2015 612512015 911012015 N N N N N N N DR-AB-30BR-NS-36115 AB-30D DR-AB-30D-NS-3015 AB-30S DR-AB-30S-NS-3Q15 AB-35BR DR-AB-35BR-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS CiIL Radium-228 T 15262-20-1 NS pCi1L Uranium-233 T 13968-55-3 NS 1L Uranium-234 T 13966-29-5 NS 1L Uranium-236 T 13982-70-2 NS I 1L ❑ ssolved Oxygen N ❑D NS mqjI 0.2 0.6 2.83 0.2 0,84 0.02 Temp Celsius N TEMP -- NS Deg C 26.8 23 21.9 25.3 28.9 32 H (field) N PH 6.5 8.5 02L SU 7.3 7.4 4.92 4.9 7.57 7.8 Turbidity. field N TURB NS NTU 9.4 9.7 7.9 8.2 6.27 7,77 Spec. Cond. field N SC NS Slcm 555 443.9 264.6 255 618 585 Oxidation Reduction. Potential N ORP NS mV -90.6 -90.1 281.7 293.3 124.7 -214A GW Depth TOC N IGW DEPTH-T00 NS ft Notes: pg/L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TQC = total organic carbon Page 4 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: AB-5D AB-51) MW-10 MW-10 MW-10D MW-10D MW-11 Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round i (CSA Sampling) 6/18/2015 9/9/2015 6/2512015 9/1112015 612412015 9111/2015 6129/2015 N N N N N N N AB-5D DWAS-SD-NS-3015 MW-10 DR-MW-10-NS-3415 MW-10D DR-MW-10D-NS-3015 MW-11 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS 1L 100 U 100 U 100 U 100 U 100 U 100 U Aluminum T 7429-90-5 NS 1L 62 J 180 100 J 100 U 100 U 160 Antimony D 7440-36-0 NS 1L 0.5 U 0.5 U 0.5 J 0.5 U 0.5 U 0.5 U Antimony T 744036--0 1 1 IMAC p 1L 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Arsenic D 7440-38-2 NS 1L 8.8 14A 0.5 J 0.5 U 0.5 U 0.5 U Arsenic T 7440-38-2 10 02L p 1L 1 8.5 13.9 0.5 U 0.5 U 0.5 U 0,14 J Barium D 7440-39-3 NS 1L 89 64 29 40 45 63 Barium T 7440-39-3 700 02L 1L 89 67 32 45 46 72 Beryllium D 744041-7 NS 1L 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.42 Beryllium T 7440-41-7 4 IMAC p 1L 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.5 Boron D 744042-8 NS p 1L 560 630 460 440 460 240 Boron T 7440-42-8 700 1 02L p 1L 500 650 460 460 440 230 Cadmium D 744043-9 NS p 1L 0.08 J 0.08 U 0,08 U 0.08 J 0.08 J 0.034 J Cadmium T 7440-43-9 2 02L 1L 0,08 U 0,08 U 0,08 U 0.08 U 0,08 U 0,038 J Calcium T 7440-70-2 NS 1L 34900 J- 40100 41000 33600 33200 2850 Chromium D 7440-47-3 NS 1L 0.2 J+ 0.5 U 3.6 0,28 J+ 0.5 U 0.36 J+ Chromium T 744047-3 10 02L p IL 3.3 1.2 6.6 0.27 J 0,34 J 1.2 J+ Cobalt D 7440-48-4 NS 1L 1.9 5A 0,19 J 0,59 0,59 28.5 Cobalt T 744048-4 1 IMAC p 1L 1 5.5 0.28 J 0.57 0.57 29.2 Copper D 7440-50-8 NS 1L 0.25 J 0,24 J 1 U 1 U 12 0.54 J+ Copper T 7440-50-8 1000 02L IL 0,51 J 0,51 J 1 U 0.43 J 0.45 J+ 2 J+ Iron D 7439-89-6 NS 1L 63 1100 50 U 130 120 50 U Iron T 7439-89-6 300 02L p 1L 140 1400 50 J 170 150 400 Lead D 7439-92-1 NS 1L 0.1 U 0A8 J 0.1 U 0.1 U 0,88 0,09 J+ Lead T 7439-92-1 15 02L 1L 0.058 J 0.12 0.1 U 0.048 J 0.063 J 1.2 J+ Magnesium T 7439-95-4 NS 1L 7180 7270 13600 11000 11000 1810 Manganese D 7439-96-5 NS IL 1000 1300 5 U 990 950 890 Manganese T 7439-96-5 5D 02L p 1L 1000 1300 13 1000 930 880 Mercury ❑ 7439-97-6 NS 1L 0.1 J 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L 1L 0.2 U 0.2 U 0.2 U 0.2 U 0.2 UJ 0.2 U Methane N 74-82-8 NS p 1L 19.1 J+ 83.8 1.5 J+ 1.5 J+ 13 10 UJ 1.6 J+ Molybdenum D 7439-98-7 NS 1L 3.6 4.4 0.5 U 0.13 J 0.15 J 0.5 U Molybdenum T 7439-98-7 NS p 1L 3.5 4.4 0.5 U 0.13 J 0.13 J 0.5 U Nickel D 7440-02-0 NS 1L 3 J+ 7 1 A 2.1 1.9 5.5 J+ Nickel T 7440-02-0 100 02L 1L 4.2 7.8 2 2A 1.7 J+ 5.6 J+ Potassium T 7440-09-7 NS 1L 13900 13300 5000 U 5000 U 5000 U 5000 U Selenium D 778249-2 NS p 1L 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p 1L 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Sodium T 7440-23-5 NS 1L 28400 32800 15800 17300 18200 19800 Strontium D 7440-24-6 NS 1L 390 470 690 270 300 54 Strontium T 7440-24-6 NS 1L 380 460 720 300 300 59 Thallium D 7440-28-0 NS 1L 0,018 J+ 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC p IL 0.024 J 0.1 U 0.1 U 0.1 U 0.1 UJ 0.023 J Vanadium D 7440-62-2 NS 1L 1 U 1 U 1 U 1 U 1 U 0.46 J Vanadium T 7440-62-2 0.3 IMAC p 1L 0.77 J 1 U 1 U 1 U 1 U 2.6 Zinc D 7440-66-6 NS 1L 3.8 J 10 U 10 U 10 UJ 10 U 5.7 J+ Zinc T 7440-66-6 1000 02L p IL 5.6 J+ 3.7 J 10 U 10 U 10 U 6.8 J+ Total Dissolved Solids N TDS 500000 02L p 1L 247000 253000 233000 297000 214000 213000 118000 Total Organic Carbon N TOC NS p 1L 1000 J 590 J 1200 1400 510 J 30100 1400 Total Suspended Solids N TSS - NS 1L 5000 7400 5000 U 2500 U 3300 38300 Alkalinity, CO3 Ni ALK-CO3 NS 1L 5000 J 5000 U 5000 U 5000 U 5000 J 5000 U 5000 J Alkalinity, HCO3 N ALK-HCO3 NS 1L 131000 129000 124000 135000 95300 89200 5000 U Alkalinity, lab N ALK-LAB NS 1L 131000 129000 124000 135000 95300 89200 5000 U Chloride N 16887-00-6 250000 02L 1L 15500 14200 20400 22700 24100 23200 6500 Nitrite as N N 14797-65-0 -- 1000 02L p 1L Nitrogen, NO2 plus NO3 N NO2-NO3 NS 1L 20 U 20 U 1500 640 J- 11 J 20 UJ 110 J+ Sulfate N 14808-79-8 250000 02L p IL 45200 55700 26800 28800 41300 42200 48100 Sulfide N 18496-25-8 NS 1L 100 U 100 U 100 U 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS 1L As V T 10103-60-3 NS 1L Chromium VI T 18540-29-9 0.07 DHHS p 1L Fe II T 1345-25-1 NS 1L Fe(Ill) T 1309-37-1 NS p 1L Mn II T 134443-0 NS 1L Mn(IV) T 1313-13-9 NS p 1L Se IV T 10102-18-8 NS 1L Se I T 13410-01-0 NS p IL Uranium, Natural T 7440-61-1 NS 1L 0.?d7 J Page 5 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: AB-51) AB-51) MW-10 MW-10 MW-10D MW-10D MWA1 Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round i (CSA Sampling) 6/18/2015 9/9/2015 6/2512015 9/1112015 612412015 9111/2015 6129/2015 N N N N N N N AB-5D DWAS-SD-NS-3015 MW-10 DR-MW-10-NS-3415 MW-10D DR-MW-10D-NS-3015 MW-11 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCill- 1 UJ Radium-228 T 15262-20-1 NS pCi1L 3 U Uranium-233 T 13968-55-3 NS 1L 0.05 U Uranium-234 T 13966-29-5 NS 1L 0.05 U Uranium-236 T 13982-70-2 NS I 1L 0.05 U ❑ ssolved Oxygen N 00 NS mqjI 0.2 5A 1.74 0.62 3.61 Temp Celsius N TEMP -- NS Deg C 24.8 20.8 20.4 19.1 24.5 H((field) N PH 6.5 8.5 02L SU 6.3 6.21 6.2 6.22 4.77 Turbidity. field N TURB NS NTU 8.5 5.4 1.2 1.1 5.53 Spec. Cond. field N SC NS Slem 431,1 340 330 336 160.5 Oxidation Reduction. Potential N CRP NS mV -33.1 119 163 80 398 GW Depth TOC N IGW DEPTH -TOO NS ft 1 13.28 1 18,3 50 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 6 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NamellD: MW-11 MW-11D MW-308SR MW-308BR MW-310BR MW-310BR MW-311t3R Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 9/11/2015 6/29/2015 6115/2015 9/9/2015 6/1612015 9/912015 6/29/2015 N N N N N N N DR-MW-11-NS-3415 MW-11D MW-308BR DR-MW-308BR-NS-3015 MW-310SR DR-MW-31OBR-NS-3015 MW-311BR Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS /L 100 U 100 U 9.7 J+ 100 U 5.7 J 100 U 100 U Aluminum T 7429-90-5 NS /L 790 740 483 120 659 580 910 Antimony D 7440-36-0 NS /L 0.5 U 0.5 U 0.22 J 0.5 U 0.32 J I A 0.22 J Antimony T 7440-36-0 1 IMAC p /L 0.5 U 0.5 U 0.24 J 0,39 J 0,34 J 0.99 0.3 J Arsenic D 7440-38-2 NS /L 0.5 U 0.18 J 1.7 0:67 1.1 2.7 0.35 J Arsenic T 7440-38-2 10 02L p /L 0.5 U 0,25 J 1,8 0.79 1.3 2.5 0.32 J Barium D 7440-39-3 NS /L 71 54 69 69 56 33 94 Barium T 7440-39-3 700 02L /L 81 54 76 i 69 57 46 110 Beryllium D 744041-7 NS /L 0,46 0.2 U 0.2 U 7 0.2 U 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p 1L 0,46 0.2 U 0.2 U 01 U 0.2 U 0.2 U 0,2 U Boron D 744042-8 NS p /L 290 91 260 J+ 440 31 J 49 J 700 Boron T 7440-42-8 700 02L p /L 280 87 260 360 35 J+ 40 J 690 Cadmium D 744043-9 NS p /L 0,046 J 0.08 U 0:08 U 0.08 U 0.08 U 0,08 U 0.08 U Cadmium T 7440-43-9 2 02L /L 0,046 J 0,08 U 0.08 U 0,08 U 0,08 U 0,08 U 0,08 U Calcium T 7440-70-2 NS /L 3270 62500 169000 232000 34700 26100 53400 Chromium D 7440-47-3 NS /L 0.24 J 1.1 J+ 0.5 U 0,17 J 1.7 J+ 0.63 0,37 J+ Chromium T 744047-3 10 02L p IL 0.58 1.5 J+ 1.5 0.8 2.3 2.8 3.3 J+ Cobalt D 7440-48-4 NS /L 33.9 0,5 U 0.32 J 14,7 0.5 U 0,5 U 0,52 Cobalt T 744048-4 1 IMAC p /L 30.5 0.22 J 0.6 9.3 0.2 J 0.21 J 0.84 Copper D 7440-50-8 NS /L 2,5 0.55 J+ 1 U 1 U 0,26 J+ 0.36 J 1 UJ Copper T 7440-50-8 1000 02L IL 0,49 J+ 1.8 J+ 0,54 J'+ 0.46 J 0.91 J+ 1.2 2.6 J+ Iron D 7439-89-6 NS /L 50 U 50 U 1190 7600 50 U 50 U 380 Iron T 7439-89-6 300 02L p /L 1300 850 1910 5300 377 410 1200 Lead D 7439-92-1 NS /L 0.24 0.1 U.! 0.1 U 0.1 U 0,1 UJ 0.058 J 0.1 UJ Lead T 7439-92-1 15 02L /L 0.32 0.29 J+ 0.22 J+ 0.16 0.88 1.1 0.53 J+ Magnesium T 7439-95-4 NS /L 2090 8020 28000 42800 6510 3980 11200 Manganese D 7439-96-5 NS IL 930 100 2000 7700 120 8.2 570 Manganese T 7439-96-5 50 02L p /L 910 130 2200 5400 110 37 680 Mercury ❑ 7439-97-6 NS /L 0.2 U 0.2 U 0.2 U 0.2 U 0.092 J+ 0.2 U 0.2 U Mercury T 7439-97-6 1 02L /L 0.2 UJ 0,2 U 0.2 UJ 02 U 0.082 J+ 0,2 U 0,2 U Methane N 74-82-8 NS /L 2.1 J+ 7.6 J+ 27 32.8 10 U 4.4 J+ 8.5 J+ Molybdenum D 7439-98-7 NS WIL 0.5 U 3A 7,6 0.61 1.8 3.4 5 Molybdenum T 7439-98-7 NS p /L 0.5 U 2A 8.1 1.8 1.9 2.9 5 Nickel D 7440-02-0 NS /L 6 1A J+ 0.98 J+ 11.9 0,35 J+ 1.1 2,9 J+ Nickel T 7440-02-0 100 02L /L 5.9 1 A J+ 1.7 J+ 8.2 0.88 J+ 2.3 4 J+ Potassium T 7440-09-7 NS /L 5000 U 3050 J 5000 U 5000 U 5000 U 5000 U 5910 Selenium D 778249-2 NS p /L 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.39 J 0.5 U Selenium T 7782-49-2 20 02L p /L 0.5 U 0.5 U 0.5 U 0.5 U 021 J 0.41 J 0,5 U Sodium T 7440-23-5 NS /L 21200 14000 20100 23300 21200 23600 23800 Strontium D 7440-24-6 NS /L 64 480 1200 2000 190 160 920 Strontium T 7440-24-6 NS /L 64 510 1300 1700 200 190 980 Thallium D 7440-28-0 NS /L 0.1 U 0.1 U 0.1 U 0.1 U 0,1 UJ 0.1 U 01 U Thallium T 7440-28-0 0.2 IMAC p /L 0.017 J+ 0.021 J 0.1 U 0.1 U 0.1 UJ 0.016 J 0.016 J Vanadium D 7440-62-2 NS WIL 0.67 J 0.5 J+ 1 U 1 U 2.1 4.9 0.38 J+ Vanadium T 7440-62-2 0.3 IMAC p /L 0.58 J 1 U 0.84 J 1 U 2.5 3.7 0.89 J Zinc D 7440-66-6 NS /L 15 10 UJ 9.8 J+ 3,1 J 10 U 10 U 3.8 J+ Zinc T 7440-66-6 1000 02L p /L 6.5 J 4.6 J+ 6.8 J+ 31 5.7 J 6.7 J 15 J+ Total Dissolved Solids N TDS 500000 02L p /L 143000 304000 844000 1300000 183000 161000 318000 Total Organic Carbon N TOC NS /L 1500 1000 U 610 J 1000 U 800 J 840 J 27400 Total Suspended Solids N TSS - NS !L 1 11400 9200 19700 16400 36700 41400 55300 Alkalinity, CO3 Ni ALK-CO3 NS p /L 5000 U 5000 U 10000 U 5000 U 10000 U 8800 5000 U Alkalinity, HCO3 N ALK-HCO3 NS /L 5000 U 124000 170000 140000 110000 73700 154000 Alkalinity, lab N ALK-LAB NS /L 5000 U 124000 170000 140000 110000 82500 154000 Chloride N 16887-00-6 250000 02L 1L 7600 23600 11600 13100 11600 12700 22000 Nitrite as N N 14797-65-0 -- 1000 02L p /L Nitrogen, NO2 plus NO3 N NO2-NO3 NS /L 100 J- 65 J+ 20 U 11 J 20 U 20 U 14 J+ Sulfate N 14808-79-8 250000 02L p /L 48600 70000 323000 586000 14100 18700 53000 Sulfide N 18496-25-8 NS /L 100 U 100 U 200 U 100 U 1000 U 100 U 100 U As(III) T 7784-46-5 NS /L As V T 10103-60-3 NS /L Chromium VI T 18540-29-9 0.07 DHHS p /L Fe II T 1345-25-1 NS /L Fe(Ill) T 1309-37-1 NS p /L Mn II T 134443-0 NS /L Mn(IV) T 1313-13-9 NS p /L Se IV T 10102-18-8 NS !L Se l T 13410-01-0 NS p /L Uranium, Natural T 7440-61-1 NS !L 1 0,397 Page 7 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NamellD: MWA1 MW-11D MW-308SR MW-308BR MW-310BR MW-310BR MW-311BR Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 {CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 9/11/2015 6/29/2015 6115/2015 9/9/2015 6/1612015 9/912015 6/29/2015 N N N N N N N DR-MW-11-NS-3415 MW-11D MW-308BR DR-MW-308BR-NS-3015 MW-310SR DR-MW-31OBR-NS-3015 MW-311BR Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCill- 2.02 Radium-228 T 15262-20-1 NS pCi1L 3 U Uranium-233 T 13968-55-3 NS 1L 0.05 U Uranium-234 T 13966-29-5 NS 1L 0,05 U Uranium-236 T 13982-70-2 NS !L 0.05 U ❑ ssolved Oxygen N 00 NS m 1I 0.06 2,24 0.49 0.2 0,28 0.9 0,77 Temp Celsius N TEMP -- NS Deg C 19.8 22 31A 22.3 32.8 25.2 24 H (field) N PH 6.5 8.5 02L SU 3.11 7.78 7.05 6.6 8,16 8.8 7,05 Turbidity. field N TURB NS NTU 26 5.26 5.45 6.2 9.92 9.1 39.18 Spec. Cond. field N SC NS S/cm 147 454A 1096 1628 283.9 241.3 505 Oxidation Reduction. Potential N CRP NS mV 185 132.5 -20.4 -89 121:6 75.8 -120.9 GW Depth TOC N IGW DEPTH -TOO NS ft 13.84 18.1 Notes: pg1L = micrograms per liter pS1cm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 8 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name11D: MW-311BR MW-314SR MW-314BR MW-9 MW-911) MW-9D Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 9/11/2015 6/2512015 9111/2015 6/3012015 6124/2015 9/11/2015 N N N N N N DR-MW-311BR-NS-3015 MW-3148R DR-MW-314BR-NS-3015 MW-9 MW-9D DR-MW-9D-NS-3015 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS 1L 100 U 100 U 100 U 100 U 100 U 100 U Aluminum T 7429-90-5 NS IL 560 350 120 250 2400 1300 Antimony D 7440-36-0 NS 1L 0.5 U 0.53 1.3 0.5 U 0.5 U 0.5 U Antimony T 744036--0 1 1 IMAC p 1L 0,5 U 0,47 J 1.6 0,5 U 0.5 U 0,27 J Arsenic D 7440-38-2 NS 1L 0.18 J 0.36 J 1.7 0.14 J 0.5 U 0.5 U Arsenic T 7440-38-2 10 02L p 1L 0.5 U 0.3 J 1,8 J+ 0.27 J 0,21 J 0,12 J+ Barium D 7440-39-3 NS 1L 94 19 20 64 4 J 3.5 J Barium T 7440-39-3 700 02L 1L 110 24 25 70 19 22 Beryllium D 744041-7 NS 1L 0.2 U 0.2 U 0.2 U 0.11 J 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p 1L 01 U 0,2 U 0,2 U 0,21 0.19 J 0,1 J Boron D 744042-8 NS p 1L 790 510 460 50 U 1000 1000 Boron T 7440-42-8 700 02L p 1L 810 500 490 28 J 1000 1100 Cadmium D 744043-9 NS p 1L 0.08 U 0,08 U 0,08 U 0.08 U 0,15 0.059 J Cadmium T 7440-43-9 2 02L 1L 0,08 U 0,08 U 0,03 J 0,031 J 1,8 0.12 Calcium T 7440-70-2 NS 1L 53900 47400 48600 11400 21100 20800 Chromium D 7440-47-3 NS 1L 0.25 J 0.87 J+ 0.32 J 2,5 0,45 J+ 0.58 Chromium T 744047-3 10 02L p IL 2.1 5 0.96 J+ 1.8 J+ 7.1 3.6 Cobalt D 7440-48-4 NS 1L 0.13 J 0.5 U 0,5 U 5,6 0.28 J 0,37 J Cobalt T 744048-4 1 IMAC p 1L 0.52 0.34 J 0.17 J 6.4 1.5 2.7 Copper D 7440-50-8 NS 1L 1.1 2,1 J+ 43 1 UJ 0.34 J 8.4 Copper T 7440-50-8 1000 02L IL 0.72 J 1.2 J+ 0.79 J+ 10.9 8.7 3.1 J+ Iron D 7439-89-6 NS 1L 470 50 U 28 J 340 50 U 50 U Iron T 7439-89-6 300 02L p 1L 1100 380 160 990 2600 1400 Lead D 7439-92-1 NS 1L 0.25 0,1 U 0.77 0.1 U 0.1 U 0.92 Lead T 7439-92-1 15 02L 1L 0.38 0.21 0.15 1.4 1.6 0.78 Magnesium T 7439-95-4 NS 1L 11500 13400 12900 7310 9180 9190 Manganese D 7439-96-5 NS IL 510 15 70 1600 540 610 Manganese T 7439-96-5 50 02L p 1L 540 25 65 1000 600 1100 Mercury ❑ 7439-97-6 NS 1L 0.2 U 0.23 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L 1L 0.2 U 0,2 U 0.2 U 0.095 J 0.2 U 0.2 U Methane N 74-82-8 NS 1L 11.4 2.5 J+ 18.3 1.6 J+ 10 a 12.8 J+ Molybdenum D 7439-98-7 NS 1L 0,6 0,72 J+ 21 0.1 J 9,7 9A Molybdenum T 7439-98-7 NS p 1L 0:63 0.91 2 0.5 U 10.1 9.4 Nickel D 7440-02-0 NS 1L 2,6 1.2 J+ 1,5 1.7 2.6 33 Nickel T 7440-02-0 100 02L 1L 3.1 3.4 J+ 1.9 J+ 1.2 J+ 5.2 4.2 J+ Potassium T 7440-09-7 NS 1L 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Selenium D 778249-2 NS p 1L 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p 1L 0.5 U 0,5 U 0.5 U 0,5 U 0.5 U 0.5 U Sodium T 7440-23-5 NS 1L 16900 11400 13200 14300 25400 26800 Strontium D 7440-24-6 NS 1L 920 160 170 120 100 130 Strontium T 7440-24-6 NS 1L 930 160 170 130 120 140 Thallium D 7440-28-0 NS 1L 0.1 U 0.1 U 0,039 J 0,1 U 0.1 U 0,1 U Thallium T 7440-28-0 0.2 IMAC p IL 0.1 U 0.016 J 0.045 J+ 0.1 U 0.035 J 0.016 J+ Vanadium D 7440-62-2 NS 1L 0.5 J 0.65 J 0.63 J 0.47 J 0.5 J 0.74 J Vanadium T 7440-62-2 0.3 IMAC p 1L 0.62 J 1.3 0.82 J 2.3 11.1 2.7 Zinc D 7440-66-6 NS 1L 10 U 10 U 5.9 J 8,5 J 10 UJ 10 U Zinc T 7440-66-6 1000 02L p IL 8.9 J 5.5 J+ 7.9 J 8.5 J 6.1 J 4.8 J Total Dissolved Solids N TDS 500000 02L p 1L 1 272000 261000 289000 113000 238000 213000 Total Organic Carbon N TOC NS 1L 1000 U 1000 U 1000 U 1700 1000 U 1000 U Total Suspended Solids N TSS - NS 1L 18500 12600 14500 2500 U 49000 264000 Alkalinity, CO3 Ni ALK-CO3 NS p 1L 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS 1L 127000 56700 60000 35200 32400 29600 Alkalinity, lab N ALK-LAB NS 1L 127000 56700 60000 35200 32400 29600 Chloride N 16887-00-6 250000 02L WIL 23000 30500 30500 13000 J- 20000 19900 Nitrite as N N 14797-65-0 -- 1000 02L p 1L Nitrogen, NO2 plus NO3 N NO2-NO3 NS 1L 20 U 20 U 20 U 230 20 U 20 U Sulfate N 14808-79-8 250000 02L p IL 53800 95800 98200 36100 87300 91400 Sulfide N 18496-25-8 NS 1L 100 U 100 U 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS 1L As V T 10103-60-3 NS 1L Chromium VI T 18540-29-9 0.07 DHHS p 1L Fe II T 1345-25-1 NS 1L Fe(Ill) T 1309-37-1 NS p 1L Mn II T 134443-0 NS /L Mn(IV) T 1313-13-9 NS 1L IV T 10102-18-8 NS 1L re e I T 13410-01-0 NS p IL Uranium, Natural T 7440-61-1 NS 1L Page 9 of 10 Table 2-7 Groundwater Results Beneath Ash Basin - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NameflD: MW-311BR MW-314SR MW-314BR MW-9 MW-91) MW-9D Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 9/11/2015 6/2512015 9111/2015 6/3012015 6124/2015 9/11/2015 N N N N N N DR-MW-311BR-NS-3015 MW-3148R DR-MW-314BR-NS-3015 MW-9 MW-9D DR-MW-9D-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS CiIL Radium-228 T 15262-20-1 NS pCi1L Uranium-233 T 13968-55-3 NS 1L Uranium-234 T 13966-29-5 NS 1L Uranium-236 T 13982-70-2 NS I 1L Dissolved Oxygen N 00 NS m 1I 0.25 0.99 0,38 1,68 0.52 0,21 Temp Celsius N TEMP -- NS Deg C 18 26.7 21.6 21.7 20.8 22.8 H (field) N PH 6.5 8.5 02L SU 6.9 7.39 7,64 6,73 6.57 6.44 Turbidity. field N TURB NS NTU 20.6 7.63 8.35 84,09 66 48.29 Spec. Cond. field N SC NS Slcm 807 414.9 306.2 219A 324 228.9 Oxidation Reduction. Potential N CRP NS mV -47.1 108.3 -129.3 179.9 145 110.8 GW Depth TOC N IGW DEPTH -TOO NS ft 45.1 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TQC = total organic carbon Page 10 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NameIID: AS-10D AS-10D AS-12D AS-12S AS-12S AS-213 AS-2111) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 6/812015 9/812015 619/2015 619/2015 918/2015 6117/2015 91312015 N N N N N N N AS-10D DR-AS-10D-NS-3015 ❑R AS-12D_WG_20150609 AS-12S DR-AS-I2S-NS-3015 AS-21) DR-AS-2D-NS-3015 Constituent Fractlon CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS NIL 578 810 13A J+ 100 U 100 U 100 U Aluminum T 7429-90-5 NS pqII. 730 920 554 J+ 100 U 760 650 Antimony D 7440-36-0 NS pWL 2.7 3A 0,24 J 0.5 U 0.5 U 0.5 U Antimony T 7440-36-0 1 IMAC p IL 2.9 3.8 0,23 J 0.5 U 0.16 J 0,5 U Arsenic D 7440-38-2 NS pqIL 8.5 7.6 0.48 J 0.23 J 0.24 J 0.17 J Arsenic T 7440-38-2 10 02L p L 8,9 7,5 0.52 0.28 J 0.29 J 0.38 J Barium D 7440-39-3 NS pqIL 30 16 33 31 120 170 Barium T 7440-39-3 700 02L pqIL 32 19 37 29 130 190 Beryllium D 7440-41-7 NS pqJL 0.2 U 0,2'U 0.2 U 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 0.2 U 0.2 U 0.2 U 0.2 U 0.096 J 0,1 J Boron D 7440-42-8 NS p IL 50 U 26 J 1000 1300 150 360 Boron T 7440-42-8 700 02L p L 29 J 31 J 1000 1200 160 410 Cadmium D 7440-43-9 NS p IL 0,08 U 0:08 U 0.2 0,036 J 0.08 u 0.08 U Cadmium T 7440-43-9 2 02L uQJL 1 0,08 U 0,08 U 0,19 0.04 J 0.041 J 0,08 U Calcium T 7440-70-2 NS IL 65000 49900 40700 45900 72500 96600 Chromium D 7440-47-3 NS pqjL 2 J 2,2 0.22 J+ 0,49 J 0,58 0.73 Chromium T 744047-3 10 02L NIL 2.4 2.9 1.1 J+ 1.1 J+ 1.4 2.3 Cobalt D 7440-48.4 NS pqjL 0,5 U 0.5 U 2 1.2 1,6 0,81 Cobalt T 744048-4 1 IMAC p IL 0.5 U 0.5 U 2.2 1.3 2.1 1.2 Copper D 7440-50-8 NS pqjL 0,76 J+ 3,6 0.4 J+ 6,8 0.76 J+ 0.46 J Copper T 7440-50-8 1000 02L IL 1.2 J+ 2.1 1.1 J+ 0.46 J 1 UJ 1.1 Iron D 7439-89-6 NS pqIL 50 U 50 U 82,6 370 1800 1800 Iron T 7439-89-6 300 02L p IL 35.6 J 69 928 450 2900 2800 Lead D 7439-92-1 NS qjL 0,077 J 0,69 0.1 U 0,51 0.1 U 0.17 Lead T 7439-92-1 15 02L p IL 0.1 U 0.095 J 0.5 J+ 0.11 0.54 0.48 Magnesium T 7439-95-4 NS pqjL 59.2 J 100 U 30600 35700 16700 27400 Manganese D 7439-96-5 NS p IL 5 U 5 U 420 330 1500 1900 Manganese T 7439-96-5 SO 02L p L 5 U 3A J 430 320 1500 2100 Mercury D 7439-97-6 NS p IL 0,2'U 0,2 U 0.2 U 0.2 U 0.2 UJ 0.2 U Mercury T 7439-97-6 1 02L pqJL 0.2 U 0.2 U 0.12 J 0.2 U 0.085 J+ 0,2 U Methane N 74-82-8 NS p IL 10 U 14.4 J+ 10 U 9.4 J+ 10 U 5.8 J+ Molybdenum D 7439-98-7 NS pqjL 3,8 4,5 2.8 0.59 1 0.84 Molybdenum T 7439-98-7 NS p IL 3.9 4.7 2.5 0,64 1 0.86 Nickel D 7440-02-0 NS pqIL 0.5 U 0.4 J 9,6 5,7 1.8 J+ 1.6 Nickel T 7440-02-0 100 02L pqIL 0.23 J 0.92 9.8 5A 2.8 J+ 2.4 Potassium T 7440-09-7 NS IL 5000 U 4210 J 5000 U 5000 U 3120 J 5000 U Selenium D 7782-49-2 NS p IL 28.8 31.3 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p IL 35.3 31 0.5 U 0.5 U 0.5 U 0.5 U Sodium T 7440-23-5 NS p iL 9700 11800 29000 33600 29700 26600 Strontium D 7440-24-6 NS pqIL 320 300 600 700 510 630 Strontium T 7440-24-6 NS pgYL 350 350 600 660 530 700 Thallium D 7440-28-0 NS pqjL 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC p IL 0.1 U 0.1 U 0.1 U 0.1 U 0.061 J 0.023 J+ Vanadium D 7440-62-2 NS pqjL 13.3 30.6 0.29 J 0.32 J 0.32 J 1 U Vanadium T 7440-62-2 0.3 IMAC NIL 15.3 30.6 1.1 0.52 J 1.6 1.4 Zinc D 7440-66-6 NS pqIL t0 U 3.3 J 10 U 27 8A J 2,7 J Zinc T 7440-66-6 1000 02L p IL 5A J+ 6.3 J 4,2 J+ 43 16 J+ 4.8 J Total Dissolved Solids N TDS 500000 02L p L 220000 J- 202000 350000 321000 405000 498000 Total Organic Carbon N TOC NS pqIL 1000 U 1600 1600 1500 1500 1200 Total Suspended Solids N TSS NS IL 1100 5000 U 89000 2500 U 189000 133000 Alkalinity, CO3 N ALK-CO3 NS p IL 63000 54900 10000 U 5000 U 10000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS pQJL 23000 5000 U 190000 192000 170000 224000 Alkalinity, lab N ALK-LAB - NS pqJL 100000 77200 190000 192000 170000 224000 Chloride N 16887-00-6 250000 02L PQJL 20300 19700 18700 21400 16900 17100 Nitrite as N N 14797-65-0 1000 02L L Nitrogen, NO2 plus NO3 N NO2-NO3 NS uWL 20 U 20 U 32 20 U 20 U 20 U Sulfate N 14808-79-8 250000 02L p IL 43900 43800 71700 83100 J- 90600 135000 Sulfide N 18496-25-8 NS IL 100 U 100 U 200 U 100 U 100 U 100 U As(III) T 7784-46-5 NS pqjL As V T 10103-60-3 NS pqjL Chromium VI T 18540-29-9 0.07 ❑HHS pq1L Fe II T 1345-25-1 NS pqIL Fe(Ill) T 1309-37-1 NS p IL Mn II T 1344-43-0 NS piplL Mn(IV) T 1313-13-9 NS pqJL Se IV T 10102-18-8 NS /L Se I T 13410-01-0 NS L Uranium, Natural T 7440-61-1 NS pqIL Page 1 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name11D: AS-10D AS-10D AS-12D AS-12S AS-12S AS-213 AS-2D Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 6/812015 9/812015 619/2015 619/2015 918/2015 6117/2015 91312015 N N N N N N N AS-10D DR-AS-10D-NS-3015 ❑R AS-12D_WG_20150609 AS-12S DR-AS-I2S-NS-3015 AS-21) DR-AS-2D-NS-3015 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCi1L Radium-228 T 15262-20-1 NS Ci1L Uranium-233 T 13968-55-3 NS u 11 Uranium-234 T 13966-29-5 NS u 1l Uranium-236 T 13982-70-2 NS ugh ❑ ssolved Oxygen N DO NS m 1L 2.38 2.2 1.29 025 0.12 Temp Celsius N TEMP NS Deg C 27.5 24.9 30.1 242 24.4 H (field) N PH 6.5 8.5 02L Su 10.67 10.7 5.95 6.1 6.32 Turbidity. field N TURB -- NS NTU 3.58 4.3 926 1.47 6.12 Spec. Cond. field N SC NSPS/cm 582 3B8.5 606 643 553 Oxidation Reduction. Potential N ORP NS mV 104 -21.7 222.2 167.6 -180.9 GW Depth OC N JGW DEPTH-T{] NS I I ft 26A2 18,43 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCVL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 2 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: AS-41D AS-4D AS-41) AS-61) AS-6D AS-88R AS-8BR Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 GSA Sampling) Round 2 3Q-2015 61512015 6126/2015 9/312015 618/2015 918/2015 6/9/2015 918/2015 N N N N N N N AS-41) AS-4111) DR-AS-4D-NS-3015 AS-61) DR-AS-6D-NS-3Q15 AS-8BR DR-AS-BBR-NS-3Q15 Constituent Fractlon CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS NIL 5.1 J 98 J 7.8 J 100 U 13.3 J+ 100 U Aluminum T 7429-90-5 NS pqIL 2990 1001 206 110 331 J+ 100 U Antimony D 7440-36-0 NS pWL 0.5 U 0.5 U 0.16 J 0.5 U 0.5 U 0.5 U Antimony T 7440-36-0 1 IMAC p IL 0,5 U 0,5 U 0.24 J 0,5 U 0.21 J 0.5 U Arsenic D 7440-38-2 NS IL 1.5 1.5 1.5 0.86 0.16 J 0.5 U Arsenic T 7440-3B-2 10 02L p L 1,8 1,6 2 0.88 0.34 J 0.12 J Barium D 7440-39-3 NS pqIL 86 88 43 42 78 77 Barium T 7440-39-3 700 02L pqIL 97 100 45 49 95 86 Beryllium D 7440-41-7 NS pqJL 0.2'U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 0,18 J 0,2 U 0.2 U 0.2 U 0.2 U 0,2 U Boron D 7440-42-8 NS p IL 730 800 33 J 50 U 33 J 50 U Boron T 7440-42-8 700 02L p L 810 930 37 J 25 J 45 J 50 U Cadmium D 7440-43-9 NS p IL 0.08 U 0,08 U 0.08 U 0.08 U 0.08 U 0.08 U Cadmium T 7440-43-9 2 02L uQJL 1 0,08 U 0.08 U 0,08 U 0,08 U 0,08 U 0,08 U Calcium T 7440-70-2 NS IL 72800 88700 16300 18000 84600 66600 Chromium D 7440-47-3 NS pqjL 0,2 J+ 0.19 J+ 0.24 J 0.32 J IA J+ 0.3 J Chromium T 7440-47-3 10 02L p IL 3.3 0.91 J+ 0.47 J 1.9 J+ 4.4 0.5 UJ Cobalt D 7440-48.4 NS pqjL 2A 2.7 1A 0.59 0,5 U 0,5 U Cobalt T 7440484 1 IMAC p IL 4 2.9 1.1 0.7 0.15 J 0.5 U Copper D 7440-50-8 NS pqjL 1 UJ 1 UJ 1 U 0.78 J 1 U 1 U Copper T 7440-50-8 1000 02L IL 3.6 J+ 1 U 0.54 J+ 0.84 J+ 0,88 J 0.25 J+ Iron D 7439-89-6 NS pqIL 1 158 170 2880 3100 206 150 Iron T 7439-89-6 300 02L p 1L 4480 250 J+ 3920 3400 466 170 J+ Lead D 7439-92-1 NS pqIL 0,089 J 0,059 J+ 0.1 U 0.14 0,048 J+ 0.1 U Lead T 7439-92-1 15 02L p IL 1.7 0.28 J 0.087 J 0.24 J+ 0.19 J+ 0.1 U Magnesium T 7439-95-4 NS pqjL 37500 44600 20300 26300 10800 11600 Manganese D 7439-96-5 NS p IL 700 770 260 220 790 920 Manganese T 7439-96-5 SO 02L p L 770 870 270 250 910 950 Mercury D 7439-97-6 NS p JL 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L uWL 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0,2 U Methane N 74-82-8 NS p IL 41 221 J 68 106 20 15.6 J+ Molybdenum D 7439-98-7 NS pqjL 6,8 7,6 0.64 0.15 J 1 A J+ 0.13 J Molybdenum T 7439-98-7 NS p IL 7.2 7.8 0.35 J 0.2 J 1.8 0.14 J Nickel D 7440-02-0 NS pqIL 2.1 2.5 J+ 1.5 J 0.88 0,85 J+ 0,34 J Nickel T 7440-02-0 100 02L 1L 5.2 J+ 3 1,5 1.3 J+ 1.2 J+ 0.33 J+ Potassium T 7440-09-7 NS /L 2600 J 2770 J 5000 U 5000 U 4810 J 5000 U Selenium D 7782-49-2 NS p IL 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p IL 0.5 U 0.5 U 0.5 U 0,5 U 0.5 U 0.5 U Sodium T 7440-23-5 NS p IL 22300 26100 20400 22800 14000 13000 Strontium D 7440-24-6 NS pqIL 920 970 150 150 400 380 Strontium T 7440-24-6 NS IL 980 1100 160 180 440 440 Thallium D 7440-28-0 NS pqjL 0.1 U 0.1 U 0.1 U 0.1 U 0.034 J 0.1 U Thallium T 7440-28-0 0.2 IMAC p IL 0.034 J 0.022 J+ 0.1 U 0.1 U 0.1 U 0.1 U Vanadium D 7440-62-2 NS pqjL 1 U 1 U 1 U 1 U 1.4 1 U Vanadium T 7440-62-2 0.3 IMAC NIL 4.8 1 U 0.69 J+ 0.4 J 2.7 1 U Zinc D 7440-66-6 NS pqIL 7,5 J 10 UJ 7.3 J 12 10 U 10 U Zinc T 7440-66-6 1000 02L p IL 2.6 J+ 10 U 12 J+ 18 4.5 J+ 10 U Total Dissolved Solids N TDS 500000 02L p L 410000 J- 432000 220000 J- 237000 370000 314000 Total Organic Carbon N TOC NS 1L 1200 1200 640 J 2000 U 1000 U 1000 U Total Suspended Solids N TSS NS /L 90000 47400 5500 12900 38000 2500 U Alkalinity, CO3 N ALK-CO3 NS p IL 10000 U 5000 U 10000 U 5000'U 10000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS pQJL 310000 336000 J 140000 152000 150000 158000 Alkalinity, lab N ALK-LAB - NS pqJL 310000 336000 J 140000 152000 150000 158000 J+ Chloride N 16887-00-6 250000 02L PQJL 21900 22400 16300 16500 8200 4800 Nitrite as N N 14797-65-0 1000 02L L Nitrogen, NO2 plus NO3 N NO2-NO3 NS pqIL 20 U 20 U 20 U 20 U 20 U 20 U Sulfate N 14808-79-8 250000 02L p 1L 44900 49400 15100 15600 74500 59700 Sulfide N 19496-25-8 NS IL 500 U 100 U 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS p IL 1.41 As V T 10103-60-3 NS pqjL 0.2 U Chromium VI T 18540-29-9 0.07 ❑HHS pq1L 0.007 J+ Fe II T 1345-25-1 NS pqIL 14B Fe(Ill) T 1309-37-1 NS p JL 20 U Mn II T 1344-43-0 NS L 951 Mn(IV) T 1313-13-9 NS pqJL 1 UJ Se IV T 10102-18-8 NS /L 0,5 U Se I T 13410-01-0 NS L 0.5 U Uranium, Natural T 1 7440-61-1 NS pqIL Page 3 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name11D: AS-41) AS-4D AS-41) AS-61) AS-6D AS-88R AS-8BR Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 GSA Sampling) Round 2 3Q-2015 61512015 6126/2015 9/312015 618/2015 918/2015 6/9/2015 918/2015 N N N N N N N AS-41) AS-4D DR-AS-4D-NS-3015 AS-61) DR-AS-6D-NS-3Q15 AS-8BR DR-AS-88R-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCi1L Radium-228 T 15262-20-1 NS Ci1L Uranium-233 T 13968-55-3 NS u 11 Uranium-234 T 13966-29-5 NS u 1l Uranium-236 T 13982-70-2 NS ugh ❑ ssolved Oxygen N DO NS m 1L 0.36 0.43 0.41 1,46 0,31 Temp Celsius N TEMP NS Deg C 25.2 27.8 24.8 24.6 19.8 H (field) N PH 6.5 8.5 02L Su 6.24 6.02 6 7,09 T07 Turbidity. field N TURB -- NS NTU 7.49 9.3 8.32 51.38 0.88 Spec. Cond. (fieldl SC NS S1cm 744 380.8 420.E 496.5 458 Oxidation Reduction. Potential N ORP NS mV 169.5 113.2 29.9 20 -59.4 GW Depth OC N JGW DEPTH -TO -- NS I ft 36.5 37,97 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective Januar+ 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 4 of 10 Corrective Action Plan Part 2 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name11D: AS -OD AS -OD AS-$D MW-301BR MW-3018R MW-3038R MW-303RR Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) 612I2015 6126/2015 9/912015 6/11/2015 9/412015 611212015 6/2212015 N N N N N N N AS-813 AS-8111] DR-AS-8D-NS-3015 MW-301BR DR-MW-301BR-NS-3015 MW-3038R MW-303SR Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS NIL 7 J 100 U 5.9 J 100 U 4.7 J Aluminum T 7429-90-5 NS pqIL 1530 62 J 202 230 J'+ 938 Antimony D 7440-36-0 NS pWL 1 UJ 0.5 U 0.5 U 0.5 U 0.16 J Antimony T 7440-36-0 1 IMAC p IL 1 UJ 0.5 U 0,16 J 0,5 U 0,25 J Arsenic D 7440-38-2 NS pqIL 1.2 J 0.41 J 0.84 0.64 6.4 Arsenic T 7440-38-2 10 02L p L 1,24 J 038 J 0,9 0,58 8,6 Barium D 7440-39-3 NS pqIL 64 69 33 21 69 Barium T 7440-39-3 700 02L pqIL 82 71 35 26 94 Beryllium D 7440-41-7 NS pqJL 1 UJ 0.2 U 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 1 UJ 0.2 U 0,2 U 0.2 U 0,2 UJ Boron D 7440-42-8 NS p IL 50 UJ 50 U 50 U 50 U 50 U' Boron T 7440-42-8 700 02L p L 50 UJ 50 U 50 U 50 U 29 J+ Cadmium D 7440-43-9 NS p IL 1 UJ 0,08 U 0.08 U 0:08 U 0,08 U Cadmium T 7440-43-9 2 02L uQJL 1 UJ 0,08 UJ 0,08 U 0.08 U 0,08 U Calcium T 7440-70-2 NS IL 47000 46700 43100 30200 34700 Chromium D 7440-47-3 NS pqjL 1 UJ 0.54 44 0,32 J 0,27 J Chromium T 744047-3 10 02L NIL 1.9 J 0.25 J+ 1.2 J+ 1 J+ 6.4 Cobalt 0 7440-48.4 NS pqjL 1 UJ 0.5 U 0,19 J 0,16 J 0.18 J Cobalt T 744048-4 1 IMAC p IL 1 UJ 0.5 U 0.26 J 0.24 J+ 0.95 Copper D 7440-50-8 NS PQjL 1 UJ 1 U 1 U 1A 1 U Copper T 7440-50-8 1000 02L IL 1 UJ 1 UJ 0.4 J 0.4 J 3.2 J+ Iron D 7439-89-6 NS pqIL 1160 700 146 330 2260 Iron T 7439-89-6 300 02L p IL 2900 890 383 J+ 690 J+ 2760 Lead 0 7439-92-1 NS qjL 1 UJ 0.1 U 0.1 U 0.13 0.1 U Lead T 7439-92-1 15 02L p IL 1 UJ 0.1 UJ 0.14 J+ 0.18 1.2 Magnesium T 7439-95-4 NS pqjL 11300 12300 8200 7900 9480 Manganese D 7439-96-5 NS p IL 1100 1000 400 410 510 Manganese T 7439-96-5 SO 02L p L 1140 1000 410 400 J+ 500 Mercury D 7439-97-6 NS p JL 0.05 U 0.2 U 0.2 U 0.2 U 0.2 U Cu T 7439-97-6 1 02L L 0.05 U 0.2 U 0.2 U 0.2 U 0,2 U Methane N 74-82-8 NS uo1L 10 U 24.5 J+ 10 U 5.1 J+ 10.2 J+ Molybdenum 0 7439-98-7 NS pqjL 1 UJ 0,13 J 1,2 0,71 1,5 Molybdenum T 7439-98-7 NS p IL 1 UJ 0.16 J 1.3 0.69 2.1 Nickel D 7440-02-0 NS pqIL 1 UJ 033 J 2.4 J+ 038 J 0.51 J+ Nickel T 7440-02-0 100 02L pqIL 1.59 J 0.28 J+ 0.93 J+ 0.68 4.8 J+ Potassium T 7440-09-7 NS 1L 1810 5000 U 5000 U 5000 U 3420 J Selenium D 7782-49-2 NS p IL 1 UJ 0.5 U 0.32 J 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p IL 1 UJ 0,5 U 0,39 J 0,5 U 0,33 J Sodium T 7440-23-5 NS p iL 15700 14500 10600 9730 17400 Strontium D 7440-24-6 NS pqIL 320 310 370 280 170 Strontium T 7440-24-6 NS pgYL 330 320 380 290 190 Thallium D 7440-28-0 NS pqjL 0.2 UJ 0.1 U 0.1 U 0.1 U 0,017 J Thallium T 7440-28-0 0.2 IMAC p IL 0.2 UJ 0.1 U 0.035 J 0.02 J 0.056 J Vanadium D 7440-62-2 NS pQJL 0.3 UJ 1 U 1.5 0.4 J 0.39.E Vanadium T 74,40-62-2 0.3 IMAC NIL 1.88 J 1 U 1.8 0.811 3.7 Zinc D 7440-66-6 NS pqIL 12 J 10 U IOU 13 J+ 8.4 J Zinc T 7440-66-6 1000 02L p IL 7 J 10 UJ 3.7 J 3 J 16 Total Dissolved Solids N TDS 500000 02L p L 250000 236000 210000 215000 J+ 272000 Total Organic Carbon N TOC NS pqIL 523 610 J 540 J 1000 U 760 J Total Suspended Solids N TSS NS 1L 38000 5000 U 9100 18200 13000 J Alkalinity, CO3 N ALK-CO3 NS p IL 10000 U 5000 U 10000 U 5000 U 10000 U Alkalinity, HCO3 N ALK-HCO3 NS pQJL 170000 160000 150000 108000 140000 Alkalinity, lab N ALK-LAB - NS pqJL 170000 160000 150000 108000 140000 Chloride N 16887-00-6 250000 02L pqjL 6800 6600 4400 4200 8300 Nitrite as N N 14797-65-0 1000 02L L 10 UJ Nitrogen, NO2 plus NO3 N NO2-NO3 NS pqIL 20 U 20 U 20 U 20 U Sulfate N 14808-79-8 250000 02L p IL 25000 20600 3300 2400 14900 Sulfide N 19496-25-8 NS JL 100 U 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS pqjL 0.593 As V T 10103-60-3 NS pqjL 0.2 U Chromium VI T 18540-29-9 0.07 ❑HHS p L 0.008 J+ Fe II T 1345-25-1 NS pqIL 974 Fe(Ill) T 1309-37-1 NS p JL 28300 Mn II T 1344-43-0 NS piplL 1210 Mn(IV) T 1313-13-9 NS pqJL 6A6 Se IV T 10102-18-8 NS pqjL 0.5 U Se(VI) T 13410-01-0 NS L 0.5 U Uranium, Natural T 7440-61-1 NS ijQIL Page 5 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name11D: AS-81) AS-8D AS-$D MW-301BR MW-3018R MW-3038R MW-303RR Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) 61212015 6126/2015 9/912015 6/11/2015 9/412015 611212015 6/2212015 N N N N N N N AS-813 AS-8D DR-AS-8D-NS-3015 MW-301BR DR-MW-301SR-NS-3015 MW-3038R MW-303SR Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCi1L Radium-228 T 15262-20-1 NS Ci1L Uranium-233 T 13968-55-3 NS u 11 Uranium-234 T 13966-29-5 NS u 1l Uranium-236 T 13982-70-2 NS ugh ❑ ssolved Oxygen N DO NS m 1L 0.35 0,26 0.51 0,27 Temp Celsius N TEMP NS Deg C 24.1 22.3 32A 32.7 H (field) N PH 6.5 8.5 02L Su 6.83 6,62 6,9 6,56 Turbidity. field N TURB -- NS NTU 38.05 7.1 9.78 9.25 Spec. Cond. (fieldl SC NS PSI= 411.6 371 337.E 282.8 Oxidation Reduction. Potential N ORP NS mV 38.5 -35.7 44 26.2 GW Depth OC N JGW DEPTH -TO NS I ft 38.65 Notes: pg1L = micrograms per liter pS1cm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective Januar+ 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TQC = total organic carbon Page 6 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name11D: MW-3038R MW-306BR MW-306SR MW-306SR MW-3158R MW-3156R Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 91412015 6/12/2015 6/22/2015 914/2015 6/19/2015 9/8/2015 N N N N N N DR-MW-303BR-NS-3015 MW-306BR MW-306BR DR-MW-306BR-NS-3015 MW-3158R DR-MW-315BR-NS-3015 Constituent Fractlon CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS NIL 100 U 7.9 J 100 U 100 U 100 U Aluminum T 7429-90-5 NS pqIL 660 J+ 96.2 J- 600 790 100 U Antimony D 7440-36-0 NS pWL 0,36 J 0.43 J 0.5 U 0.29 J+ 0.5 U Antimony T 7440-36-0 1 IMAC p IL 0.95 0,38 J 0.2 J 0.21 J 0,5 U Arsenic D 7440-38-2 NS pqIL 2.5 1.1 0.9 0.16 J 0,18 J Arsenic T 7440-38-2 10 02L p L 4,5 1 1 0.19 J 0.33 J Barium D 7440-39-3 NS pqIL 71 150 140 58 59 Barium T 7440-39-3 700 02L pqIL 94 150 160 71 22 Beryllium D 7440-41-7 NS pqJL 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 0,095 J 0.2 U 0,2 U 0,2 U 0.16 J Boron D 7440-42-8 NS p IL 50 U 940 1500 50 U 50 U Boron T 7440-42-8 700 02L p L 50 U 920 1700 50 U 50 U Cadmium D 7440-43-9 NS p IL 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U Cadmium T 7440-43-9 2 02L uQJL 1 0.08 U 0.08 U 0.08 U 0,08 U 0.029 J Calcium T 7440-70-2 NS IL 38600 91500 143000 40200 48400 Chromium D 7440-47-3 NS pqjL 0.28 J 0,31 J 0,29 J 0.32 J+ 0,19 J Chromium T 744047-3 10 02L NIL 7.2 1 A J+ 3.2 J+ 24.8 6 Cobalt D 7440-48.4 NS pqjL 0,13 J 0,45 J 1,2 1.2 J+ 0,48 J Cobalt T 744048-4 1 IMAC p IL 0.46 J+ 0.5 U IA 2.2 2.6 Copper D 7440-50-8 NS PQjL 5,5 1 U 0,8 J+ 1 U 1 U Copper T 7440-50-8 1000 02L IL 28.3 1 U 1.4 J+ 2.4 5.2 J+ Iron D 7439-89-6 NS pqIL 2200 582 3100 86 39 J Iron T 7439-89-6 300 02L p IL 3400 J+ 623 J 4000 1300 27 J Lead D 7439-92-1 NS pqIL 0,28 0.1 U 0,065 J 0.1 U 0.11 Lead T 7439-92-1 15 02L p IL 0.68 0.095 J 0.43 0.81 1 A Magnesium T 7439-95-4 NS pqjL 12200 26600 57900 22600 14900 Manganese D 7439-96-5 NS p IL 530 930 2200 1500 1100 Manganese T 7439-96-5 SO 02L p L 590 J+ 920 2400 181i0 2,6 J+ Mercury D 7439-97-6 NS p JL 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L pqJL 0.2 U 02 U 0.2 U 0,2 U 0.2 U Methane N 74-82-8 NS p IL 13A J+ 20.4 J+ 10 UIJ 10.9 J+ 4.6 J+ Molybdenum D 7439-98-7 NS pqjL 2,1 2.3 4.5 0,36 J+ 0,21 J Molybdenum T 7439-98-7 NS p IL 2.6 1.9 4.3 0.94 0,28 J Nickel D 7440-02-0 NS pqIL 3 2 J+ 3.5 1.2 J+ 0.78 Nickel T 7440-02-0 100 02L pqIL 5 2.2 J+ 4.1 16A 5.3 Potassium T 7440-09-7 NS IL 3740 J 4290 J 2970 J 5000 U 5000 U Selenium D 7782-49-2 NS p IL 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L p IL 0,2 J 0.5 U 0,22 J 0,5 U 0.5 U Sodium T 7440-23-5 NS p iL 19200 24200 32900 22100 15000 Strontium D 7440-24-6 NS pqIL 180 730 1200 420 460 Strontium T 7440-24-6 NS pgYL 210 740 1400 460 63 Thallium D 7440-28-0 NS pqjL 0.1 U 0.1 U 0.1 U 0,1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC p IL 0.018 J 0.1 U 0,018 J 0:024 J 0.028 J Vanadium D 7440-62-2 NS pqjL 0,28 J 1.5 1 U 1 U 1 U Vanadium T 7440-62-2 0.3 IMAC NIL 2 1.6 1.6 1.4 5.5 Zinc D 7440-66-6 NS pqIL 9 J+ 2.5 J 19 J+ 130 2.8 J Zinc T 7440-66-6 1000 02L p IL 16 51 38 13 4.5 J Total Dissolved Solids N TDS 500000 02L p L 260000 J+ 530000 778000 J+ 277000 228000 Total Organic Carbon N TOC NS pqIL 580 J 900 J 530 J 810 J 1000 U Total Suspended Solids N TSS NS IL 31200 6300 J 14100 222000 63600 Alkalinity, CO3 N ALK-CO3 NS p IL 5000 U 10000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS pQJL 145000 160000 190000 176000 148000 Alkalinity, lab N ALK-LAB - NS pqJL 145000 160000 190000 J- 176000 148000 Chloride N 16887-00-6 250000 02L pqjL 9700 21600 29700 10400 5600 Nitrite as N N 14797-65-0 1000 02L L Nitrogen, NO2 plus NO3 N NO2-NO3 NS pqIL 20 U 20 U 20 UJ 20 U 20 UJ Sulfate N 14808-79-8 250000 02L p IL 16700 187000 345000 38400 39500 Sulfide N 18496-25-8 NS 7L 100 U 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS pqjL As V T 10103-60-3 NS pqjL Chromium VI T 18540-29-9 0.07 ❑HHS pq1L Fe II T 1345-25-1 NS pqIL Fe(Ill) T 1309-37-1 NS p JL Mn II T 1344-43-0 NS L Mn(IV) T 1313-13-9 NS pqJL Se IV T 10102-18-8 NS /L Se I T 13410-01-0 NS L Uranium, Natural T 7440-61-1 NS pqIL Page 7 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name11D: MW-3038R MW-306BR MW-306SR MW-306SR MW-3158R MW-3156R Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 91412015 6/12/2015 6/22/2015 914/2015 6/19/2015 9/8/2015 N N N N N N DR-MW-303BR-NS-3015 MW-306BR MW-306BR DR-MW-306BR-NS-3015 MW-3158R DR-MW-315BR-NS-3015 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCi/L Radium-228 T 15262-20-1 NS Ci/L Uranium-233 T 13968-55-3 NS u !I Uranium-234 T 13966-29-5 NS u 1l Uranium-236 T 13982-70-2 NS ugh ❑ ssolved Oxygen N DO NS m 1L 0.48 2,51 0.63 Temp Celsius N TEMP NS Deg C 29.4 19.5 30 H (field) N PH 6.5 8.5 02L Su 6.96 6.7 7.25 Turbidity. field N TURB -- NS NTU 8.39 13.34 21,23 Spec. Cond. (fieldl SC NS PSI= 727 368 385,3 Oxidation Reduction. Potential N ORP NS mV 3.3 -24.9 23 GW Depth OC N JGW DEPTH -TO NS ft Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective Januar+ 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TQC = total organic carbon Page 8 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Location: Event: Sample Date: Sample Type Code: Sample Name11D: MW-317BR MW-3181) MW-318D OW-303D Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 2 3Q-2015 6/512015 61212015 9/912015 9/12/2015 N N N N MW-317BR MW-3180 DR-MW-318D-NS-3Q15 DR•OW-303D-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS NIL 520 21 J 100 U 100 U Aluminum T 7429-90-5 NS pqIL 649 510 120 7400 Antimony D 7440-36-0 NS pWL 1 1 UJ 0.5 U 2 Antimony T 7440-36-0 1 IMAC p IL 2.1 1 UJ 0,5 U 2.9 Arsenic D 7440-38-2 NS IL 0.63 1 UJ 1 40.2 Arsenic T 7440-38-2 10 02L p L 0,71 1 UJ 0,93 55 Barium D 7440-39-3 NS pqIL 46 35 J 34 210 Barium T 7440-39-3 700 02L pqIL 58 41 J 37 320 Beryllium D 7440-41-7 NS pqJL 0,2'U 1 UJ 0.31 0,11 J Beryllium T 7440-41-7 4 IMAC p IL 0.2 U 1 UJ 0,31 2,1 Boron D 7440-42-5 NS p IL s0 U 1250 1300 1200 Boron T 7440-42-8 700 02L p L 44 J 1310 1300 1000 Cadmium D 7440-43-9 NS p IL 0,08 U 1 UJ 0.068 J 0,44 Cadmium T 7440-43-9 2 02L pqjL 0,08 U 1 UJ 0,068 J 0,65 Calcium T 7440-70-2 NS IL 107000 21100 24900 52800 J- Chromium D 7440-47-3 NS pqjL 8,4 1 UJ 0.38 J 0.27 J+ Chromium T 744047-3 10 02L NIL 11 2.8 J 0.69 J+ 15.1 Cobalt D 7440-48.4 NS pqjL 0.5 J 12,9 J 6.6 47.8 Cobalt T 7440484 1 IMAC p IL 0.5 J 13 J 6.7 53.2 Copper D 7440-50-8 NS pqjL 4.8 J+ 1.38 J 2 J 1.4 J+ Copper T 7440-50-8 1000 02L IL 1.6 J+ 9.7 J 0,56 J 37.6 J+ Iron D 7439-89-6 NS pqIL 50 J 588 490 9200 Iron T 7439-89-6 300 02L p IL 128 1150 720 14900 Lead D 7439-92-1 NS pqIL 0,77 1 UJ 0.36 0A49 J+ Lead T 7439-92-1 15 02L p IL 0.15 1 UJ 0.38 12.1 Magnesium T 7439-95-4 NS pqjL 670 12700 15400 26100 Manganese D 7439-96-5 NS p IL IOU 607 390 5000 Manganese T 7439-96-5 SO 02L p L 8.7 577 430 4500 Mercury D 7439-97-6 NS p IL 0,2'U 0.05 J 0.2 U 0.2 JJ Mercury T 7439-97-6 1 02L pqJL 0.2 U 0.05 U 0.2 U 0.2 U Methane N 74-82-8 NS p IL 20 U 10 U 9.3 J+ 131 Molybdenum D 7439-98-7 NS pqjL 5,1 1 UJ 0,5 U 5,5 Molybdenum T 7439-98-7 NS p IL 5.6 1 UJ 0.5 U 7A Nickel D 7440-02-0 NS pqIL 0,5 UJ 12.4 J 10.7 20,1 Nickel T 7440-02-0 100 02L IL 0.54 J+ 15A J 11.3 31.4 J+ Potassium T 7440-09-7 NS 1L 15600 1700 5000 U 9510 Selenium D 7782-49-2 NS p IL 0,53 1 UJ 1.2 0.5 U Selenium T 7782-49-2 20 02L p IL 0,75 1,03 J 1 2,2 Sodium T 7440-23-5 NS p IL 18700 35400 26500 35600 Strontium D 7440-24-6 NS pqIL 450 589 650 1800 Strontium T 7440-24-6 NS IL 570 604 650 1900 Thallium D 7440-28-0 NS pqjL 0.1 J 0.2 UJ 0.1 U 0,26 Thallium T 7440-28-0 0.2 IMAC p IL 0,1 J 0.2 UJ 0.1 U 0.56 Vanadium D 7440-62-2 NS pQJL 8.5 0.3 UJ 1 U 0.91 J Vanadium T 7440-62-2 0.3 IMAC NIL 8.4 0.654 J 1 U 36.5 Zinc D 7440-66-6 NS pqIL 10 U 78 34 J 2700 Zinc T 7440-66-6 1000 02L p IL 10 UJ 71 25 3000 Total Dissolved Solids N TDS 500000 02L p L 350000 J- 270000 257000 377000 Total Organic Carbon N TCC NS IL 1100 738 1200 J+ 14900 Total Suspended Solids N TSS NS 1L 14000 J- 9000 6200 1320000 Alkalinity, CO3 N ALK-CO3 NS p IL 130000 10000 U 5000 U 145000 J+ Alkalinity, HCO3 N ALK-HCO3 NS pQJL 10000 U 83000 71000 98000 Alkalinity, lab N ALK-LAB - NS pqJL 270000 83000 71000 243000 Chloride N 16887-00-6 250000 02L pqjL 8000 9100 8800 29400 Nitrite as N N 14797-65-0 1000 02L L 10 UJ Nitrogen, NO2 plus NO3 N NO2-NO3 NS pqIL 20 J 20 U 27 Sulfate N 14808-79-8 250000 02L p IL 15500 91000 90500 42900 Sulfide N 19496-25-8 NS 7L 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS p IL As V T 10103-60-3 NS pqjL Chromium VI T 18540-29-9 0.07 ❑HHS pq1L Fe II T 1345-25-1 NS pqIL Fe(Ill) T 1309-37-1 NS p IL Mn II T 1344-43-0 NS L Mn(IV) T 1313-13-9 NS pqJL IV T 10102-18-8 NS pqjL re .(VI) T 13410-01-0 NS L Uranium, Natural T 7440-61-1 NS pqIL Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Page 9 of 10 Table 2-8 Groundwater Results Beneath Ash Storage Areas - Round 1 and Round 2 Location: Event: Sample Date: Sample Type Code: Sample Name11D: MW-317BR MW-3181) MW-318D OW-303D Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 2 3Q-2015 6/512015 61212015 9/912015 9/12/2015 N N N N MW-317BR MW-3180 DR-MW-318D-NS-3Q15 DR•0W-303D-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCi1L Radium-228 T 15262-20-1 NS Ci/L Uranium-233 T 13968-55-3 NS u !I Uranium-234 T 13966-29-5 NS u 1l Uranium-236 T 13982-70-2 NS ugh ❑ ssolved Oxygen N DO NS m 1L 1.38 1.5 0,22 Temp Celsius N TEMP NS Deg C 21.1 21.1 26.9 H (field) N PH 6.5 8.5 02L Su 11." 5.51 5.23 Turbidity. field N TURB -- NS NTU 3.12 10.63 6.08 Spec. Cond. field N SC NS PSI= 1399 404 379.3 Oxidation Reduction. Potential N ORP NS mV -29.3 241.9 194.5 GW Depth OC N JGW DEPTH-Tod—NS I it Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 [amended effective Januar+ 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Page 10 of 10 Table 2-9 Groundwater Results Gowngradient of the Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: GWA-10D GWA-10D GWA-1UD GWA-11D GWA-11D GWA-115 GWA-14D Round 1 (CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) 6/4/2015 6/26/2015 9/8/2015 61512015 9/3/2015 611012015 6130/2015 N N N N N N N GWA-10D GWA-10D DR-GWA-10D-NS-3015 GWA-11D DR-GWA-11D-NS-3015 GWA-11S GWA-14D Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS uglL 9 100 U 3.3 J 100 U 6.5 J 100 U Aluminum T 7429-90-5 NS pqIL 6940 1100 425 J+ 330 53 90 J Antimony D 7440-36-0 NS uglL 1 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Antimony T 7440-36-0 1 IMAC NIL 1 U 0,5 U 0.5 U 0.5 U 0,18 J 0.5 U Arsenic D 7440-38-2 NS IL 1 U 0.5 U 0.2 J 0.28 J 0.14 J 0.36 J Arsenic T 7440-38-2 10 02L pIL 1 U 0.4 J 0.25 J 0,39 J 0,18 J 0.38 J Barium D 7440-39-3 NS u IL 55 32 60 55 24 75 Barium T 7440-39-3 700 02L pgIL 136 65 64 63 25 78 Beryllium D 7440-41-7 NS u 1L 1 U 0.13 J 0.2 U 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 1 U 0,36 0.2 U 0.2 U 0,2 U 0.2 U Boron D 7440-42-8 NS W IL 172 300 50 U 50 U 100 250 Boron T 7440-42-8 700 02L pgIL 298 310 50 U 50 U 110 260 Cadmium D 7440-43-9 NS u 1L 1 U 0.033 J 0.08 U 0.08 U 0.039 J 0.08 U Cadmium T 7440-43-9 2 02L pgIL 1 1 U 0,049 J 0.08 U 0.08 U 0,046 J 0,08 U Calcium T 7440-70-2 NS IL 24200 19800 48000 55500 9730 66200 Chromium D 7440-47-3 NS pgIL 1 U 2.2 0,28 J+ 2.3 J+ 7.7 0,28 J Chromium T 7440-47-3 10 02L W IL 9.93 23.3 1 A J+ 22+2 15.6 0.27 J+ Cobalt D 7440-48-4 N pgIL 2.11 0.71 1,2 1 A 2.9 0,2 J Cobalt T 7440-48-4 1 IMAC W IL 3.45 1.1 II A 1.7 3.3 0.23 J Copper D 7440-50-8 NS pgIL 7.79 J+ 1.2 0,29 J+ 4 0,28 J 0.28 J+ Copper T 7440-50-8 1000 02L W IL 8.24 4.2 J+ 0,57 J+ 1.3 0.44 J 1 UJ Iron D 7439-89-6 NS IL 146 64 1180 2200 134 50 U Iron T 7439-89-6 300 02L g IL 6040 1100 1700 3200 227 140 Lead D 7439-92-1 NS ppIL 1.04 0,16 0.1 U 0,41 J+ 0,1 U 0.1 U Lead T 7439-92-1 15 02L pgIL 9.42 2.3 0.26 0.24 0.11 0.1 U Magnesium T 7439-95-4 N5 pqIL 13100 13000 16600 20000 5140 7420 Manganese D 7439-96-5 NS pgIL 453 160 730 890 1200 290 Manganese T 7439-96-5 50 02L g IL 509 130 810 980 1200 300 Mercury D 7439-97-6 NS u IL 0.05 U 02 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L pgIL 0.05 U 0.2 U 0.2 U 0.2 U 0,81 J+ 0.2 U Methane N 74-82-8 NS lL 10 U 1.6 J+ 27 11A J+ 13 62 J+ Molybdenum D 7439-98-7 NS IL 1 U 0,095 J 0.97 11 0,46 J 12.5 Molybdenum T 7439-98-7 NS W IL 1 U 0.53 0,87 1.6 0.7 J+ 13 Nickel D 7440-02-0 NS IL 6,43 8.8 1.1 J+ 11.3 13.9 0.51 Nickel T 7440-02-0 100 02L pgIL 11.1 19.3 1.7 J+ 20.5 17 0.46 J+ Potassium T 7440-09-7 NS pgIL 3210 5000 U 5000 U 5000 U 5000 U 5000 U Selenium D 7782-49-2 NS IL 1 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L pgIL 1 U 0.22 J 0.5 U 0.5 U 0,5 U 0.5 U Sodium T 7440-23-5 NS W IL 23400 17800 18100 19300 12500 21100 Strontium D 7440-24-6 NS pgIL 381 360 440 450 240 1700 Strontium T 7440-24-6 NS u IL 481 430 480 500 240 1800 Thallium D 7440-28-0 NS pgIL 0.2 U 0.1 U 0.1 U 0.1 U 0,1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC IL 0.256 0.03 J 0.1 U 0.1 UJ 0.1 U 0.1 U Vanadium D 7440-62-2 NS pgIL 0.324 0.29 J 1 U 1 U 0.34 J 0.5 J Vanadium T 7440-62-2 0.3 IMAC W IL 3.36 1.3 1.2 J+ 0.45 J 0.52 J 0_.67 J Zinc D 7440-66-6 NS pgIL 13 45 11 3.7 J+ 7.6 J 10 U Zinc T 7440-66-6 1000 02L W IL 43 J+ 110 43 J+ 6 J 2.7 J+ 4.1 J Total Dissolved Solids N TDS 500000 02L p IL 220000 208000 240000 J- 291000 10000 U 325000 Total Organic Carbon N TCC NS IL 459 J+ 1100 930 J 1100 860 J 650 J Total Suspended Solids N TSS NS pgIL 15000 14000 53000 3800 8600 6500 Alkalinity, CO3 N ALK-0O3 NS u IL 10000 U 5000 U 10000 U 5000 U 10000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS L 39000 39800 180000 187000 57000 132000 Alkalinity, lab N ALK-LAB NS IL 39000 39800 180000 187000 57000 132000 Chloride N 16887-00-6 250000 02L pgIL 14000 11300 10900 10700 10000 13800 Nitrite as N N 14797-65-0 1000 02L W IL 232 Nitrogen, NO2 plus NO3 N NO2-NO3 NS IL 290 20 U 20 U 75 20 UJ Sulfate N 14808-79-8 250000 02L g IL 3300 72400 37100 37200 4400 88500 Sulfide N 19496-25-8 NS PqIL 4000 UJ 100 U 200 U 100 U 100 U 100 U As(III) T 7784-46-5 NS IL 0.2 U As V T 10103-60-3 NS IL 0.2 U Chromium VI T 18540-29-9 0.07 DHHS W IL 0.105 Fe II T 1345-25-1 NS pgIL 92 Fe(Ill) T 1309-37-1 NS W IL 20 U Mn II T 134443-0 NS L 296 Mn(IV) T 1313-13-9 NS IL 1 UJ Se IV T 10102-18-8 NS IL 0.091 Se l T 1341MI-0 NS pgIL 0.5 U Uranium, Natural T 7440-61-1 NS IL Page 1 of 12 Table 2-9 Groundwater Results Gowngradient of the Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: GWA-10D GWA-10D GWA-10D GWA-11D GWA-11D GWA-11S GWA-14D Round 1 {CSA Sampling) Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 1 (CSA Sampling) 6/4/2015 6/26/2015 9/8/2015 61512015 9/3/2015 611012015 6130/2015 N N N N N N N GWA-10D GWA-10D DR-GWA-10D-NS-3015 GWA-11D DR-GWA-11D-NS-3015 GWA-11S GWA-14D Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCill- Radium-228 T 15262-20-1 NS Ci/L Uranium-233 T 13968-55-3 NS u 1L Uranium-234 T 13966-29-5 NS pg1L Uranium-236 T 13982-70-2 NS 1L ❑ ssolved Oxygen N DO NS m IL 1.15 1.08 0,47 4.74 0.58 Temp Celsius N TEMP NS Deq C 18.8 28.7 26.1 26.7 19 H((field) N PH 6.5 8.5 02L SU 5.82 5.4 1 6.71 5.83 7.34 Turbidity. field N TURB -- NS NTU 7.65 8.69 9.23 7.93 4.73 Spec. Cond. (fieldl N SC NS PS1cm 319.5 303.3 429.8 165.1 807 Oxidation Reduction. Potential N ORP NS my 140.8 208.3 26.3 246.9 -20.8 GW Depth TOC N JGW DEPTH-TOCI NS ft 33.79 Notes: pg1L = micrograms per liter pS1cm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 2 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 7 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NameIID: GWA-14D GWA-14S GWA-14S GWA-15D GWA-15D GWA-1D GWA-1D Round 2 3Q-2015 Round 2 3Q-2015 Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 9/912015 9/912015 9/11/2015 613012015 9110/2015 611112015 9/812015 N N N N N N N DR-GWA-I4D-NS-3015 DR-GWA-I4S-NS-3015 DR-GWA-I4S-NS-3015 GWA-15D DR-GWA-I5D-NS-3015 GWA-10 DR-GWA-I D-NS-3015 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS uglL 100 J 100 U 74 J 100 U 4 J 100 U Aluminum T 7429-90-5 NS pqIL 100 U 58 J 660 1000 413 60 J+ Antimony D 7440-36-0 NS uglL 0.5 J 0.5 U 0.17 J 0.5 U 0,24 J 1.1 Antimony T 7440-36-0 1 IMAC NIL 0,5 U 0,5 U 0.5 U 0,5 U 0.31 J 1.3 Arsenic D 7440-38-2 NS IL 0.45 J 1.2 0.14 J 0,31 J 1 1.3 Arsenic T 7440-38-2 10 02L u IL 0.45 J 1.2 0,18 J 0.32 J 1.2 1 A Barium D 7440-39-3 NS uglL 76 58 61 52 51 68 Barium T 7440-39-3 700 021- qlL 5 U 47 67 59 62 79 Beryllium D 7440-41-7 NS u IL 0.2 U 0.2 U 0.2'J 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 0,2 U 0,2 U 0.2 U 0,084 J 0.2 U 0.2 U Boron D 7440-42-8 NS W IL 260 49 J 79 73 50 U 50 J Boron T 7440-42-8 700 02L pgIL 50 U 28 J 86 80 50 U 50 J Cadmium D 7440-43-9 NS ugIL 0:08 U 0.08 U 0:08 U 0,08 U 0.08 J 0,08 U Cadmium T 7440-43-9 2 02L pgIL 1 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0,08 U Calcium T 7440-70-2 NS IL 71600 10600 140000 1 126000 54300 34000 Chromium D 7440-47-3 NS IL 0,32 J 0,34 J 0,38 J 0.19 J 0.73 0.23 J Chromium T 7440-47-3 10 02L W IL 0.66 J+ 13.6 1.2 J+ 1.8 1.6 J+ 0.31 J Cobalt D 7440-48-4 NS pqIL 0,18 J 7.3 0,14 J 0,5 U 0.5 U 0,5 U Cobalt T 7440-48-4 1 IMAC W IL 0.32 J 3.5 0.24 J 0.61 0.3 J 0.5 U Copper D 7440-50-8 NS pgIL 0,64 J 1 U 11 0.67 J 1 U 1 U Copper T 7440-50-8 1000 02L W IL 0,25 J+ 0.69 J+ 0.76 J+ 1.8 1.1 J+ 1 UJ Iron D 7439-89-6 NS IL 1 85 4900 26 J 50 U 136 50 J Iron T 7439-89-6 300 02L g IL 50 J 3200 $40 980 719 69 J+ Lead D 7439-92-1 NS ppIL 0,11 0.1 U 0.1 U 0.12 0.1 U 0.1 U Lead T 7439-92-1 15 02L pgIL 0.14 0.1 0,33 J+ 1.3 0.29 J+ 0A U Magnesium T 7439-95-4 NS pqIL 7570 6040 18900 18400 5610 4210 Manganese D 7439-96-5 1 NS pgIL 330 7600 260 220 600 300 Manganese T 7439-96-5 I 50 02L g IL 5 uJ 2300 270 220 680 300 J+ Mercury D 7439-97-6 NS u IL 0.2 U 0.2 U 0.2 J 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L PgIL 0.2 U 0.2 U 0.2 U 0.087 J 0.2 U 0,2 U Methane N 74-82-8 NS IL 338 8A J+ 3.9 J+ 5.2 J+ 10 U 10.4 J+ Molybdenum D 7439-98-7 NS IL 13.3 2 0,93 1 2,6 3.9 Molybdenum T 7439-98-7 NS W IL 12.9 0.58 0.89 0.78 2.7 4.5 Nickel D 7440-02-0 NS IL 0,56 2,9 0,91 0.67 0,62 J+ 0,5 U Nickel T 7440-02-0 100 02L W IL 0.63 J+ 10.9 1.1 J+ 1.8 1 A J+ 0.2 J+ Potassium T 7440-09-7 NS pgIL 5000 U 2990 J 5270 7580 6280 29700 Selenium D 7782-49-2 NS IL 0.5 J 0.5 U 0.22 J 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L pgIL 0.5 U 0.5 U 0,24 J 0.5 U 0.5 U 0.5 U Sodium T 7440-23-5 NS W IL 21200 14200 26700 29800 10500 15500 Strontium D 7440-24-6 NS pgIL 1800 200 3300 3200 260 260 Strontium T 7440-24-6 NS u IL 5 J 110 3300 2800 310 310 Thallium D 7440-28-0 NS pgIL 0.1 J 0.1 U 0.1 U 01 U 0.045 J 0.1 U Thallium T 7440-28-0 0.2 IMAC IL 0.1 J 0.1 U CA J 0.024 J 0.1 U 0.1 U Vanadium D 7440-62-2 NS pgIL 1 U 1 U 0.86 J 1.2 1 U 0.38 J Vanadium T 7440-62-2 0.3 IMAC W IL 0_.62 J 0.48 J 1.5 3.2 0.79 J 0.45 J Zinc D 7440-66-6 NS pgIL 14 13 18 7.4 J 10 U 10 J Zinc T 7440-66-6 1000 02L W IL 4.3 J 5.6 J 3.8 J 4.1 J 4.8 J 10 J Total Dissolved Solids N TDS 500000 02L p IL 335000 218000 705000 618000 220000 198000 Total Organic Carbon N TCC NS IL 1000 J 1500 540 J 560 J 1000 J 690 J Total Suspended Solids N TSS NS pgIL 46900 4900 42900 13400 33000 2500 U Alkalinity, CO3 N ALK-0O3 NS u IL 5000 U 5000 U 5000 U 5000 U 10000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS L 130000 77900 129000 94500 160000 126000 Alkalinity, lab N ALK-LAB NS IL 130000 77900 129000 94500 160000 126000 Chloride N 16887-00-6 250000 02L pgIL 13100 7500 13300 12700 1500 1700 Nitrite as N N 14797-65-0 1000 02L W IL Nitrogen, NO2 plus NO3 N NO2-NO3 NS IL 20 U 20 U 20 UJ 21 20 U 20 U Sulfate N 14808-79-8 250000 02L g IL 90800 25700 307000 301000 4200 5400 Sulfide N 19496-25-8 NS pgIL 100 U 100 U 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS IL As V T 10103-60-3 NS IL Chromium VI T 18540-29-9 0.07 DHHS W IL Fe II T 1345-25-1 NS pgIL Fe(Ill) T 1309-37-1 NS W IL Mn II T 1344-43-0 NS L Mn(IV) T 1313-13-9 NS pgIL Se IV T 10102-18-8 NS IL Se l T 1341MI-0 NS JgIL Uranium, Natural T 7440-61-1 NS pcjtL Page 3 of 12 Table 2-9 Groundwater Results Downgrad-sent of the Ash Basin and Ash Storage Areas - Round 7 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name1ID: GWA-14D GWA-14S GWA-14S GWA-15D GWA-15D GWA-1D GWA-1D Round 2 3Q-2015 Round 2 3Q-2015 Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 9/912015 9/912015 9/11/2015 613012015 9110/2015 611112015 9/812015 N N N N N N N DR-GWA-I4D-NS-3015 DR-GWA-I4S-NS-3015 DR-GWA-I4S-NS-3015 GWA-15D DR-GWA-I5D-NS-3015 GWA-10 ❑R-GWA-ID-NS-3015 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCiIL Radium-228 T 15262-20-1 NS Ci1L Uranium-233 T 13968-55-3 NS u IL. Uranium-234 T 13966--29-5 NS pg1L Uranium-236 T 13982-70-2 NS /L Dissolved Oxygen N DO NS m L 0,18 1.75 0.71 0.3 0,54 0.3 Temp Celsius N TEMP NS Deg C 29.9 26 20.6 21.2 19.7 18.7 H (field) N PH 6.5 8.5 02L Su 7.1 5.9 7.09 6.8 7.5 9.1 Turbidity. field N TURB -- NS NTU 3.17 2.92 4,52 8.9 18,83 8.2 Spec. Cond. field N SC NS s1cm 508 173.7 1576 873 389.2 287.9 Oxidation Reduction. Potential N oRP NS my -45.5 61 A 156 84.8 -4.1 -78.8 GW Depth TOC N GW DEPTH -TO NS I ft 6,32 9.8 23.34 33,05 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCiIL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 4 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 7 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Namefle: GWA-1S GWA-IS GWA-2D GWA-2D GWA-2S GWA-2S GWA-3D Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 611712015 919/2015 6/10/2015 91812015 6/11/2015 9/4/2015 61412015 N N N N N N N GWA-1S DR-GWA-IS,NS•3015 GWA-2D DR-GWA-2D-NS-3015 GWA-2S DR-GWA-2S-NS-3015 GWA-3D Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS uglL 100 U 100 U 5.8 J 100 U 3.4 J 100 U 9 Aluminum T 7429-90-5 NS pqIL 920 110 90.9 310 806 1100 J+ 350 Antimony D 7440-36-0 NS uglL 0.37 J 0.9 0.55 0.25 J 0.5 U 1 U Antimony T 7440-36-0 1 IMAC NIL 0.5 UJ 0,95 2.2 0,55 0.5 U 0,5 U 1 U Arsenic D 7440-38-2 NS IL 0.5 U 0.5 U 1.1 1.5 0.5 U 1 U Arsenic T 7440-38-2 10 02L p IL 0.18 J 0.5 U 1.3 1.7 0.14 J 0,39 J 1 U Barium D 7440-39-3 NS uglL 6,2 7.7 40 41 18 17 9 Barium T 7440-39-3 700 021- qlL 12 8.6 56 46 26 27 13 Beryllium D 7440-41-7 NS u IL 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 1 U Beryllium T 7440-41-7 4 IMAC p IL 0.094 J 0.2 U 0,2 U 0.2 U 0,078 J 0,13 J 1 U Boron D 7440-42-8 NS W IL 50 U 50 U 50 U 50 U 50 U 50 U 50 U Boron T 7440-42-8 700 02L pgIL 50 U 50 U 50 U 50 U 50 U 50 U 50 U Cadmium D 7440-43-9 NS ugIL 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 1 U Cadmium T 7440-43-9 2 02L pgIL 1 0,08 U 0.08 U 0,08 U 0,08 U 0.08 U 0,08 U 1 U Calcium T 7440-70-2 NS IL 3450 2320 58200 43200 2690 2940 10800 Chromium D 7440-47-3 NS IL 2.2 J+ 0,48 J 4.3 17 1A 12.3 Chromium T 7440-47-3 10 02L W IL 1318 1.6 J+ 5.7 6.3 2.6 4.7 17.7 Cobalt D 7440-48-4 NS pgIL 2.4 1,5 0,5 U 0.5 U 1,9 1 U Cobalt T 7440-48-4 1 IMAC W IL 3 1.5 0.5 U 0,3 J 2.3 1.4 J+ 1.02 Copper D 7440-50-8 NS I PqIL 0.76 J+ 2.4 0,49 J 6A 0.31 J+ 1.03 J+ Copper T 7440-50-8 1000 02L W IL 3 J+ 0.5 J 0.54 J 0.86 J+ 0.92 J 2.3 2.99 Iron D 7439-89-6 NS IL 50 U 50 U 50 U 50 U 50 U 120 101 Iron T 7439-89-6 300 02L g IL 1200 170 86.7 230 909 1600 J+ 411 Lead D 7439-92-1 NS ppIL 0.1 U 0,27 0.1 U 036 01 U 1 U Lead T 7439-92-1 15 02L pgIL 0.51 0.069 J 0.23 0.34 0.4 J+ 1.2 1.5 Magnesium T 7439-95-4 NS pqIL 3470 1790 3860 6700 1290 1190 8090 Manganese D 7439-96-5 1 NS pgIL 100 71 5 U 280 88 81 107 Manganese T 7439-96-5 I 50 02L g IL 120 74 25 280 94 46 J+ 122 Mercury D 7439-97-6 NS u IL 0.2 UJ 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.05 U Mercury T 7439-97-6 1 02L IL 0,11 J+ 0.2 U 0,79 J+ 0.2 U 02 U 0.2 U 0.05 U Methane N 74-82-8 NS IL 10 U 2.1 J+ 10 U 3.6 J+ 10 U 2.5 J+ 10 U Molybdenum D 7439-98-7 NS IL 0.11 J 0.5 U 3.3 1.7 0.12 J 1.01 Molybdenum T 7439-98-7 NS W IL 0.3 J 0.14 J 3.9 2.2 0.11 J 0.19 J 1.28 Nickel D 7440-02-0 NS IL 8.2 2,1 0,31 J 0,46 J 3,8 12.5 Nickel T 7440-02-0 100 02L W IL 10.3 2.3 0,47 J 1.2 J+ 4.5 J+ 4.3 16.9 Potassium T 7440-09-7 NS pgIL 5000 U 5000 U 5560 5000 U 5000 U 5000 U 796 Selenium D 7782-49-2 NS IL 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 1 U Selenium T 7782-49-2 20 02L pgIL 0,5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 1 U Sodium T 7440-23-5 NS W IL 18400 15000 11400 9490 3750 J 3390 J 24900 Strontium D 7440-24-6 NS pgIL 53 35 210 260 25 23 155 Strontium T 7440-24-6 NS u IL 59 36 250 270 26 24 162 Thallium D 7440-28-0 NS pgIL 0.1 U 0,1 U 0.1 U 0.1 U 0.1 U 0.2 U Thallium T 7440-28-0 0.2 IMAC IL 0.016 J 0.1 U 0.032 J 0.1 U 0,016 J 0,031 J 0.2 U Vanadium D 7440-62-2 NS I PgIL 1 U 1 U 0.5 J 0.33 J 1 U 0.3 U Vanadium T 7440-62-2 0.3 IMAC W IL 1.5 0.39 J 0.57 J 0.65 J 1.3 4.1 0.3 U Zinc D 7440-66-6 NS pgIL 1 3.5 J 22 10 U 10 U 6,6 J 9,1 J+ 19 Zinc T 7440-66-6 1000 02L W IL 9.6 J+ 27 3.1 J+ 2.8 J 8.7 J 7 J 16 J+ Total Dissolved Solids N TDS 500000 02L p IL 105000 56000 J 10000 U 198000 37000 96000 J+ 160000 Total Organic Carbon N TCC NS IL 1900 1100 780 J 520 J 9300 960 J 412 J+ Total Suspended Solids N TSS NS pgIL 25000 2700 200000 97200 17000 58000 15000 Alkalinity, CO3 N ALK-0O3 NS u IL 10000 U 5000 U 18000 5000 U 10000 U 5000 U 10000 U Alkalinity, HCO3 N ALK-HCO3 NS L 37000 18700 29000 128000 16000 13600 75000 Alkalinity, lab N ALK-LAB NS IL 37000 18700 51000 128000 16000 13600 75000 Chloride N 16887-00-6 250000 02L pgIL 3600 J+ 4200 5000 4100 1800 1700 22000 Nitrite as N N 14797-65-0 1000 02L W IL 57 Nitrogen, NO2 plus NO3 N NO2-NO3 NS IL 20 U 37 34 20 UJ 160 J+ 190 Sulfate N 14808-79-8 250000 02L g IL 15100 J+ 15100 3100 3700 640 J 1000 6200 Sulfide N 18496-25-8 NS pgIL 200 U 100 U 100 U 100 U 100 U 100 U 500 U As(III) T 7784-46-5 NS IL As V T 10103-60-3 NS IL Chromium VI T 18540-29-9 0.07 DHHS W IL Fe(II) T 1345-25-1 NS pgIL Fe(Ill) T 1309-37-1 NS W IL Mn II T 1344-43-0 NS L Mn(IV) T 1313-13-9 NS IL Se IV T 10102-18-8 NS IL Se l T 1341MI-0 NS Pq,I Uranium, Natural T 7440-61-1 NS IL Page 5 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 7 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Namefl0: GWA-15 GWAAS GWA-2D GWA-2D GWA-2S GWA-2S GWA-3D Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round i (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 611712015 919/2015 6/10/2015 91812015 6/11/2015 9/4/2015 61412015 N N N N N N N GWA-1S DR-GWA-IS,NS•3015 GWA-2D DR-GWA-2D-NS-3015 GWA-2S DR-GWA-2S-NS-3015 GWA-3D Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCiIL Radium-228 T 15262-20-1 NS Ci1L Uranium-233 T 13968-55-3 NS u 1L. Uranium-234 T 13966--29-5 NS pg1L Uranium-236 T 13982-70-2 NS /L ❑ ssolved Oxygen N DO NS m L 49.6 2.9 1 0.33 3,8 2.7 Temp Celsius N TEMP NS Deg C 23.8 19.7 31 A 28.5 35.9 18.5 H((field) N PH 6.5 8.5 02L SU 5.97 5.7 8.98 7A4 5.74 5.7 Turbidity. field N TURB -- NS NTU 26.12 9.7 26:09 14.98 8.13 7.58 Spec. Cond. field N SC NS ps1cm 105 111.2 187.2 346.5 50.1 244.7 Oxidation Reduction. Potential N ORP NS my 296.E 5.6 177 120.5 293.4 246.2 GW Depth TOC N JGW DEPTH -TO NS ft 32.9 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCiIL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 6 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: GWA-3D GWA-3S GWA-3S GWA-4D GWA-4D GWA-4S GWA-4S Round 2 3Q-2015 Round 1 (CSA sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 91412015 6/4/2015 914/2015 6/23/2015 91912015 6/1912015 9110/2015 N N N N N N N DR-GWA-3D-NS-3Q15 GWA-3S DR-GWA-3S-NS-3015 GWA-4D DR-GWA-4D-NS-3Q15 GWA-4S DR-GWA-4S-NS-3015 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS uglL 100 U 17 100 U 100 U 100 U 100 U 100 U Aluminum T 7429-90-5 NS pqIL 170 236 190 J'+ 430 360 380 1700 Antimony D 7440-36-0 NS uglL 0.5 J 1 U 0.5 U 0.23 J 0.5 U 0.5 U 0.5 U Antimony T 7440-36-0 1 IMAC NIL 0,66 1 U 0,5 U 0,49 J 0,5 U 0,5 U 0.5 U Arsenic D 7440-38-2 NS IL 0.5 U 1 U 0.5 U 0.39 J 0.2 J 0.18 J 0.23 J Arsenic T 7440-38-2 10 02L u IL 0,16 J 1 U 0,11 J 0,37 J 0,5 U 0.2 J 0,39 J Barium D 7440-39-3 NS uglL 6 45 38 20 26 27 39 Barium T 7440-39-3 700 021- qlL 9.3 49 34 26 31 32 60 Beryllium D 7440-41-7 NS u IL 0.2 U 1 U 0.2 0.1 J 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 0,069 J 1 U 0.1 J 0,2 U 0,2 U 0,2 U 0,16 J Boron D 7440-42-8 NS W IL 27 J 50 U 50 U 240 250 200 J+ 250 Boron T 7440-42-8 700 02L pgIL 26 J 50 U 50 U 250 250 190 250 Cadmium D 7440-43-9 NS uglL 0.062 J 1 U 0.037 J 0.032 J 0,08 U 0.08 U 0.08 U Cadmium T 7440-43-9 2 02L pgIL 0,08 1 U 0,039 J 0,08 U 0,08 U 0,08 U 0,08 U Calcium T 7440-70-2 NS IL 11000 5830 2050 26500 20900 19500 19300 Chromium D 7440-47-3 NS IL 17.4 1 U 11 0,53 0.36 J 0.81 7 Chromium T 7440-47-3 10 02L W IL 39.7 1 U 4.2 1.2 J+ IA J+ 3.2 35.2 Cobalt D 7440-48-4 NS pgIL 0.91 11.3 17.6 0,17 J 0.29 J 2.7 2.5 Cobalt T 7440-48-4 1 IMAC W IL 1.1 12.2 10.8 0.35 J 0.54 2.7 3.8 Copper D 7440-50-8 NS pgIL 2.6 J+ 1 UJ 3,2 0,41 J 1 J 1 U 0.67 J Copper T 7440-50-8 loco 02L W IL 1.8 J+ 8.6 1.1 1.4 J'+ 0." J 0,58 J 3.7 Iron D 7439-89-6 NS IL 220 14 50 U 50 U 29 J 50 U 150 Iron T 7439-89-6 300 02L g IL 460 190 220 J+ 370 J+ 330 530 2400 Lead D 7439-92-1 NS ppIL 0.27 1 U 0,28 0.1 U 0.12 0.1 U 0.067 J Lead T 7439-92-1 15 02L pgIL 0.8 1 U 0.2 0.45 J+ 0.53 0.29 1.7 Magnesium T 7439-95-4 NS pqIL 9140 4990 1920 6890 7530 5970 5940 Manganese D 7439-96-5 1 NS pgIL 76 480 380 23 70 560 510 Manganese T 7439-96-5 1 50 02L g IL 89 533 300 J+ 33 90 590 540 Mercury D 7439-97-6 NS u IL 0.2 U 0.05 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L I pgIl- 0.2 U 0.05 U 0.2 U 0.2 U 0,2 U 0,2 U 0.2 U Methane N 74-82-8 NS IL 2 J+ l0 U 1.8 J+ 12.7 J+ 115 82 529 Molybdenum D 7439-98-7 NS IL 0,56 1 U 0,5 U 0,54 J+ 0.15 1 11.9 12.8 Molybdenum T 7439-98-7 NS W IL 1.2 1 U 0.5 U 0.64 0.15 J 11.6 15.2 Nickel D 7440-02-0 NS IL 28A 8.27 9 0,68 0.94 4.5 21 Nickel T 7440-02-0 100 02L W IL 34.4 8.7 9 0.91 J+ 1.3 4.5 23A Potassium T 7440-09-7 NS pgIL 5000 U 2570 2700 J 5000 U 5000 U 4320 J 4390 J Selenium D 7782-49-2 NS IL 0.5 U 1 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L pgIL 0.5 U 1 U 0,5 U 0,5 U 0,5 U 0,5 U 0.5 U Sodium T 7440-23-5 NS W IL 21100 11300 7040 17400 18600 17200 16600 Strontium D 7440-24-6 NS pgIL 160 84 53 310 290 290 340 Strontium T 7440-24-6 NS u IL 180 108 42 340 280 300 330 Thallium D 7440-28-0 NS pgIL 0.1 U 0.2 U 0,1 U 0.1 U 0.1 U 0,1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC IL 0.1 U 0.2 U 0.1 U 0.1 U 0.1 U 0.1 U 0.044 J Vanadium D 7440-62-2 NS pgIL 1 U 0.3 U 1 U 0.95 J 1 U 1 U 1 U Vanadium T 7440-62-2 0.3 IMAC W IL _ 0.6 J_ 0.3 U 0.56 J 1.5 0.53 J 0.6 J 4.3 Zinc D 7440-66-6 NS pgIL 29 27 21 J+ 10 U 9.8 J 2.6 J 4,6 J Zinc T 7440-66-6 1000 02L W IL 20 20 J+ 11 5.9 J+ 3A J 3A J 8.5 J Total Dissolved Solids N TDS 500000 02L p IL 196000 J+ 110000 83000 J+ 188000 171000 152000 157000 Total Organic Carbon N TCC NS IL 1000 U 588 J+ 2000 U 14000 1000 UJ 650 J 1000 U Total Suspended Solids N TSS NS pgIL 24400 5000 U 2700 U 102000 63000 68100 601000 Alkalinity, CO3 N ALK-0O3 NS u IL 5000 U 10000 U 5000 U 5000 U 5000 U 1 5000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS L 73000 67000 19900 64700 47200 1 58800 63500 Alkalinity, lab N ALK-LAB NS IL 73000 J- 67000 19900 64700 47200 1 58800 63500 Chloride N 16887-00-6 250000 02L pgIL 21700 11000 4500 14200 13300 1 11400 11100 Nitrite as N N 14797-65-0 1000 02L W IL 31 Nitrogen, NO2 plus NO3 N NO2-NO3 NS IL 62 J- 30 20 U 20 U 20 U 20 U Sulfate N 14808-79-8 250000 02L g IL 3900 73000 1800 47800 42700 38200 28700 Sulfide N 18496-25-8 NS pgIL 100 U 100 U 100 U 100 U 100 U 100 U 100 UJ As(III) T 7784-46-5 NS IL As V T 10103-60-3 NS IL Chromium VI T 18540-29-9 0.07 DHHS W IL Fe II T 1345-25-1 NS pgIL Fe(Ill) T 1309-37-1 NS W IL Mn II T 1344-43-0 NS L Mn(IV) T 1313-13-9 NS IL IV T 10102-18-8 NS IL rSe Se l T 1341MI-0 NS pgIL Uranium, Natural T 7440-61-1 NS IL Page 7 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: GWA-3D GWA-3S GWA-3S GWA-4D GWA-4D GWA-4S GWA-4S Round 2 3Q-2015 Round 1 (CSA sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 91412015 6/4/2015 914/2015 6/23/2015 91912015 611912015 9110/2015 N N N N N N N DR-GWA-3D-NS-3Q15 GWA-3S DR-GWA-3S-NS-3015 GWA-4D DR-GWA-4D-NS-3Q15 GWA-4S DR-GWA-4S-NS-3015 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCiIL Radium-228 T 15262-20-1 NS Ci1L Uranium-233 T 13968-55-3 NS u IL. Uranium-234 T 13966--29-5 NS pg1L Uranium-236 T 13982-70-2 NS /L Dissolved Oxygen N DO NS m L 5,47 1,49 0,18 0.51 Temp Celsius N TEMP NS Deg C 19.1 22.6 27.1 23.9 H((field) N PH 6.5 8.5 02L SU 5.51 6.9 6.3 6.39 Turbidity. field N TURB -- NS NTU 7,42 7.01 14.6 35.84 Spec. Cond. field N SC NS ps1cm 141.7 281.9 256,9 189.E Oxidation Reduction. Potential N ORP NS my 303.7 180.E 51.9 60.8 GW Depth TOC N JGW DEPTH -TO NS ft Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCiIL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 8 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Namefl0: GWA-58R GWA-58R GWA-60 GWA-6D GWA-6S GWA-6S MW-21D Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 611612015 9/912015 6/2912015 9/11/2015 6130/2015 9112/2015 6/23/2015 N N N N N N N GWA-58R DR-GWA-5BR-NS-3015 GWA-6D DR-GWA-6D-NS-3015 GWA-6S DR-GWA-6S-NS-3015 MW-21D Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS uglL 5.8 J 100 U 100 U 100 U 100 U 100 U 100 U Aluminum T 7429-90-5 NS pqIL 187 65 J 120 100 U 1300 220 100 U Antimony D 7440-36-0 NS uglL 0.5 U 0.5 U 0.5 U 0.17 J 2.5 U 0.5 U 0.5 U Antimony T 7440-36-0 1 IMAC NIL 0.5 U 0,5 U 0.5 U 0,18 J 2.5 U 0.5 U 0.5 U Arsenic D 7440-38-2 NS IL 0,85 0.31 J 0.98 0.96 2.4 J 3.1 0.41 J+ Arsenic T 7440-38-2 10 02L p IL 0,83 0,19 J 0.96 0,79 2,2 J 2.9 0,21 J Barium D 7440-39-3 NS uglL 73 64 33 42 200 210 34 Barium T 7440-39-3 700 021- qIL 75 65 35 43 210 220 42 Beryllium D 7440-41-7 NS u IL 0.2 U 0.2 U 0.2 U 0.2 U 1 U 0.2 U 0.33 Beryllium T 7440-41-7 4 IMAC p IL 0,2 U 0.2 U 0,2 U 0,2 U 1 U 0.2 U 0.2 U Boron D 7440-42-8 NS W IL 190 190 630 620 620 710 210 Boron T 7440-42-8 700 02L pgIL 190 J+ 190 610 600 1 610 700 210 Cadmium D 7440-43-9 NS uglL 0.08 U 0,08 U 0.08 U 0.08 U 0.4 U 0.08 U 0,07 J Cadmium T 7440-43-9 2 02L PqIL 0,08 U 0.08 U 0,08 U 0,08 U 0,4 U 0,08 U 0,08 U Calcium T 7440-70-2 NS IL 188000 174000 50500 45500 81100 83000 136000 Chromium D 7440-47-3 NS IL 0.27 J+ 0,52 0,22 J 0,42 J 0,9 J 0,45 J 0.39 J+ Chromium T 7440-47-3 10 02L W IL 0.5 UJ 0.7 J+ 1.1 J+ 0.68 J+ 3.6 0.75 J+ 0.31 J+ Cobalt D 7440-48-4 NS pgIL 0,26 J 0.5 U 0,45 J 0,54 2.5 U 1,6 0.5 U Cobalt T 7440-48-4 1 IMAC W IL 0.32 J 0.5 U 0.51 0.51 1.3 J 1.8 0.5 U Copper D 7440-50-8 NS pgIL 1 UJ 1 U 0,32 J 0.64 J 5 U 0.29 J 4.5 J+ Copper T 7440-50-8 loco 02L W IL 1 UJ 1 U 1 UJ 1 U 3.2 J 0,39 J 1.5 J+ Iron D 7439-89-6 NS IL 210 190 7400 6700 25300 13600 690 Iron T 7439-89-6 300 02L g IL 307 260 7400 6700 21200 15200 550 Lead D 7439-92-1 NS ppIL 0,1 UJ 0.1 U 0.1 U 0,15 0.5 U 0.1 U 0,73 J+ Lead T 7439-92-1 15 02L pgIL 0.098 J+ 0.1 U 0,18 J+ 0.073 J 1.7 0.077 J 0.76 Magnesium T 7439-95-4 NS pqIL 25900 27900 10400 10900 14100 12500 19100 Manganese D 7439-96-5 1 NS pgIL 620 630 1300 1200 3900 3700 940 Manganese T 7439-96-5 I 50 02L g IL 630 650 1300 1200 3700 3800 920 Mercury D 7439-97-6 NS u IL 0.2 UJ 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 7439-97-6 1 02L IL 0,2 UJ 0.2 U 0,2 U 0,2 U 0,2 U 02 U 0,2 U Methane N 74-82-8 NS IL 17 16.9 J+ 3080 2920 744 J 2740 16.9 J+ Molybdenum D 7439-98-7 NS IL 0,44 J 0,22 J 3.3 5A 13.7 8.6 0.34 J+ Molybdenum T 7439-98-7 NS W IL 0.55 0.23 J 3 5.2 9.2 8 0,31 J Nickel D 7440-02-0 NS IL 1 J+ 0,82 2.2 2 1.4 J 1,8 0.75 J+ Nickel T 7440-02-0 100 02L W IL 1.1 J+ 0.85 2.1 J+ 1.9 2.9 1.9 0.58 J+ Potassium T 7440-09-7 NS pgIL 5000 U 5000 U 5000 U 5000 U 12000 10700 5000 U Selenium D 7782-49-2 NS IL 0.5 U 0.5 U 0.5 U 0.5 U 2.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L pgIL 0,5 U 0,5 U 0.5 U 0.5 U 2,5 U 0,5 U 0.5 U Sodium T 7440-23-5 NS W IL 29600 21000 28200 27000 24700 26200 15800 Strontium D 7440-24-6 NS pgIL 2300 2100 190 190 860 680 810 Strontium T 7440-24-6 NS u IL 2300 2100 200 200 850 710 960 Thallium D 7440-28-0 NS pgIL 0,1 UJ 0.1 U 0.1 U R1 U 0.14 J 0.1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC IL 0.1 UJ 0.1 U 0.1 U 0.1 UJ 0.5 U 0.1 UJ 0.1 U Vanadium D 7440-62-2 NS pgIL 1 U 1 U 1 U 1 U 5 U 1.2 1 U Vanadium T 7440-62-2 0.3 IMAC W IL 0.49 J_ 1 U 1 U 1 U 6.5 1.1 1 U Zinc D 7440-66-6 NS pgIL 23 6,6 J 10 U 5.7 J 2.7 J 13 32 J+ Zinc T 7440-66-6 1000 02L W IL 6.6 J 10 U 10 UJ 6.4 J 27 J+ 4.8 J 10 U Total Dissolved Solids N TDS 500000 02L p IL 873000 799000 302000 293000 432000 340000 639000 Total Organic Carbon N TCC NS IL 26800 1000 UJ 1400 23200 34800 7800 1000 U Total Suspended Solids N TSS NS pgIL 10700 2900 15000 6200 67000 371000 3500 Alkalinity, CO3 N ALK-0O3 NS u IL 10000 U 5000 U 5000 U 5000 U 5000 U 5000 UJ 5000 U Alkalinity, HCO3 N ALK-HCO3 NS L 150000 154000 124000 92100 290000 317000 161000 Alkalinity, lab N ALK-LAB NS IL 150000 154000 124000 J+ 92100 290000 317000 161000 Chloride N 16887-00-6 250000 02L pgIL 17500 18200 16300 18300 18500 18900 17700 Nitrite as N N 14797-65-0 1000 02L W IL Nitrogen, NO2 plus NO3 N NO2-NO3 NS PgIL 20 U 20 U 22 J+ 20 UJ 20 U 16 J- 20 U Sulfate N 14808-79-8 250000 02L g IL 416000 362000 88700 97700 10900 2300 274000 Sulfide N 18496-25-8 NS pgIL 100 U 100 U 100 UJ 100 U 100 U 100 U 100 U As(III) T 7784-46-5 NS IL As V T 10103-60-3 NS IL Chromium VI T 18540-29-9 0.07 DHHS W IL Fe II T 1345-25-1 NS pgIL Fe(Ill) T 1309-37-1 NS W IL Mn II T 1344-43-0 NS L Mn(IV) T 1313-13-9 NS IL Se IV T 10102-18-8 NS IL Se l T 1341MI-0 NS pgIL Uranium, Natural T 7440-61-1 NS IL Page 9 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Namefl0: GWA-5614 GWA-58R GWA-60 GWA-6D GWA-6S GWA-6S MW-21D Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) 611612015 9/912015 6/2912015 9/11/2015 6130/2015 9112/2015 6/23/2015 N N N N N N N GWA-58R DR-GWA-5BR-NS-3015 GWA-6D DR-GWA-6D-NS-3015 GWA-6S DR-GWA-6S-NS-3015 MW-21D Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCiIL Radium-228 T 15262-20-1 NS Ci1L Uranium-233 T 13968-55-3 NS u 1L. Uranium-234 T 13966--29-5 NS pg1L Uranium-236 T 13982-70-2 NS /L ❑ ssolved Oxygen N DO NS m L 0,42 0,35 18 0.3 0.2 0.34 Temp Celsius N TEMP NS Deg C 23.7 22.4 18.6 20.5 21.1 23.4 H((field) N PH 6.5 8.5 02L Su 6,99 7,08 6.58 6.5 6.8 7.03 Turbidity. field N TURB -- NS NTU 3.75 0.55 5.61 5.5 140.2 8.22 Spec. Cond. (fieldl N SC NS s1cm 1074 1074 460 446.6 687 855 Oxidation Reduction. Potential N ORP NS my 47.2 -76 4.6 -34.7 -92.1 87,5 GW Depth TOC N JGW DEPTH-TOCJ NS ft 18.85 19,7 Notes: pg1L = micrograms per liter pSlcm = microsiemens per centimeter ft = feet my = millivolts NTU - nephelometric turbidity units pCiIL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 10 of 12 Table 2-9 Groundwater Results Qowngradient of the Ash Basin and Ash Storage Areas - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NamellD: Mw-21D Mw-21D MW-21$ MW-21S Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 3Q-2015 612412015 911012015 6124/2015 911012015 N N N N Mw-210 DR-MW-2ID-NS-3Q15 MW-21S DR-Mw-21S-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Aluminum D 7429-90-5 NS uglL 100 U 100 U 100 U Aluminum T 7429-90-5 NS pqIL 250 100 U 94 J Antimony D 7440-36-0 NS uglL 0.5 U 0.3 J 0.18 J Antimony T 7440-36-0 1 IMAC NIL 0.5 U 0,29 J 0.5 U Arsenic D 7440-38-2 NS IL 0.12 J 16.9 34.2 Arsenic T 7440-38-2 10 02L p IL 0,17 J 16.8 42.8 Barium D 7440-39-3 NS uglL 38 33 40 Barium T 7440-39-3 700 021- qlL 40 38 45 Beryllium D 7440-41-7 NS u IL 0.2 U 0.2 U 0.2 U Beryllium T 7440-41-7 4 IMAC p IL 0.2 U 0,2 U 0.2 U Boron D 7440-42-8 NS W IL 210 180 250 Boron T 7440-42-8 700 02L pgIL 210 190 260 Cadmium D 7440-43-9 NS uglL 0.08 U 0.03 J 0,08 U Cadmium T 7440-43-9 2 02L pgIL 0.08 U 0,08 U 0.08 U Calcium T 7440-70-2 NS IL 144000 22000 23400 Chromium D 7440-47-3 NS IL 0,19 J 0.22 J+ 0,5 U Chromium T 7440-47-3 10 02L W IL 0.92 0.28 J+ 0.34 J Cobalt D 7440-48-4 NS pgIL 0.5 U 0,72 1.1 Cobalt T 7440-48-4 1 IMAC W IL 0.5 U 0.79 1.5 Copper D 7440-50-8 NS pgIL 18 1 UJ 0,27 J Copper T 7440-50-8 loco 02L W IL 1.2 1 UJ 1 U Iron D 7439-89-6 NS IL 160 50 U 50 U Iron T 7439-89-6 300 02L g IL 440 50 U 120 Lead D 7439-92-1 NS ppIL 0,25 0,1 UJ 0.1 U Lead T 7439-92-1 15 02L pgIL 0.45 0.1 U 0.088 J Magnesium T 7439-95-4 NS PqIL 19900 5420 6160 Manganese D 7439-96-5 1 NS pgIL 870 640 740 Manganese T 7439-96-5 I 50 02L g IL 850 670 760 Mercury D 7439-97-6 NS u IL 0.2 U 02 U 02 U Mercury T 7439-97-6 1 02L IL 0.2 U 0,2 U 0.2 U Methane N 74-82-8 NS IL 35.8 J 8.5 J+ 764 J Molybdenum D 7439-98-7 NS IL 0,32 J 20.7 197 Molybdenum T 7439-98-7 NS W IL 0.3 J 19.9 24.3 Nickel D 7440-02-0 NS IL 0,6 1.2 J+ 1.2 Nickel T 7440-02-0 100 02L W IL 1 1.1 J+ 1.6 Potassium T 7440-09-7 NS pgIL 5000 U 4080 J 4880 J Selenium D 7782-49-2 NS IL 0.5 U 0.5 U 0.5 U Selenium T 7782-49-2 20 02L pgIL 0,5 U 0,5 U 0,5 U Sodium T 7440-23-5 NS W IL 18300 12900 15600 Strontium D 7440-24-6 NS pgIL 950 320 420 Strontium T 7440-24-6 NS u IL 890 370 420 Thallium D 7440-28-0 NS pgIL 0.1 U 0.1 U 0.1 U Thallium T 7440-28-0 0.2 IMAC IL 0.1 U 0.1 U 0.1 U Vanadium D 7440-62-2 NS pgIL 1 U 1.6 0.41 J Vanadium T 7440-62-2 0.3 IMAC W IL 0.72 J_ 1.5 0.76 J Zinc D 7440-66-6 NS pgIL 10 U 10 UJ 10 U Zinc T 7440-66-6 1000 02L W IL 2.9 J 10 UJ 2.9 J Total Dissolved Solids N TDS 500000 02L p IL 599000 137000 151000 Total Organic Carbon N TCC NS IL 1000 U 1000 U 650 J Total Suspended Solids N TSS NS pgIL 4700 5000 U 4000 Alkalinity, CO3 N ALK-0O3 NS u IL 5000 U 5000 U 5000 U Alkalinity, HCO3 N ALK-HCO3 NS L 152000 58200 76900 Alkalinity, lab N ALK-LAB NS IL 152000 58200 76900 Chloride N 16887-00-6 250000 02L pgIL 17900 11200 11700 Nitrite as N N 14797-65-0 1000 02L W IL Nitrogen, NO2 plus NO3 N NO2-NO3 NS PgIL 20 U 20 UJ 20 U Sulfate N 14808-79-8 250000 02L g IL 269000 37000 23200 Sulfide N 18496-25-8 NS pgIL 100 U 100 U 100 U As(III) T 7784-46-5 NS IL 0.2 U 1.04 As V T 10103-60-3 NS IL 0,2 U 17,9 Chromium VI T 18540-29-9 0.07 DHHS W IL 0.0103303103000000 0.029 J+ Fe II T 1345-25-1 NS pgIL 192 20 U Fe(Ill) T 1309-37-1 NS W IL 431 7.1 Mn II T 1344-43-0 NS L 1020 645 Mn(IV) T 1313-13-9 NS IL 17.44583628380 24.6 Se IV T 10102-18-8 NS IL 0.5 u 0.5 U Se l T 1341MI-0 NS pgIL 0.5 U 0.5 U Uranium, Natural T 7440-61-1 NS IL Page 11 of 12 Table 2-9 Groundwater Results Downgradient of the Ash Basin and Ash Storage Areas - Round 7 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NameflD: MW-210 MW-21D MW-21S Mw-21S Round 1 (CSA Sampling) Round 2 3Q-2015 Round 1 (CSA Sampling) Round 2 301-2015 612412015 9/1012015 612412015 9/1012015 N N N N MW-210 DR-MW-2ID-NS-3Q15 MW-21S DR-Mw-21S-NS-3Q15 Constituent Fraction CAS RN Criteria Min (range only) Groundwater Criteria Criteria Source Unit Radium-226 T 13982-63-3 NS pCi1L Radium-228 T 15262-20-1 NS CifL Uranium-233 T 13968-55-3 NS /L. Uranium-234 T 13966-29-5 NS IL Uranium-236 T 13982-70-2 NS IL Dissolved Oxygen N DO NS m IL 0,47 0.5 Temp Celcius N TEMP NS Deg, C 18.5 19.2 pH (field) N PH 6.5 8.5 02L SU 7.11 6,69 Turbidity, field N TURB -- NS NTU 8.6 5.1 Spec. Cond. (fieldl SC NS ps1cm 820 250 Oxidation Reduction Potential N ORP NS my -12 140 GW Depth TOC N JGW DEPTH -TO NS I I ft 3.9 5,18 Notes: pg1L = micrograms per liter µS1cm = microsiemens per centimeter ft = feet mV = millivolts NTU - nephelometrlc turbidity units pCi11L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 12 of 12 Table 2-10 Constituents of Interest Evaluation Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Criteria Source: Turbidity,._ 02L 11 02L I 50 02L 0,07 DHHS IMAC 1 02L 4 IMAC Boron 700 02L 10 02L .bManganese 1 IMAC 300 02L 50 02L 20 1 PPBC (Minimum (for ranges)): I SCREENING 1 • ®®® • 1 ��®®®��® Result Flagi' �� • • • ��r�a��a��s��®��_�� .:. , , �� , _era Page 1 of 6 Table 2-10 Constituents of Interest Evaluation Corrective Action Pan Part 2 Dan River Steam Station Ash Basin NC GW Criteria; Turbidity,pH 83 Iron 11 Manganese. I 50 0,07 1 4 Boron 1 700 10 ...Manganese 1 300 15 50 20 PPBC (Minimum (for ranges)):, SCREENING ONO •�®��®�a�a_��a�a-a��_�'®®a_ . , I _ate �a� .•�®��s�aa�a�a�a�a�a_a_a�a� ., I �a��a�� Page 2 of 6 Table 2-10 Constituents of Interest Evaluation Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Constituent: Fraction: Unit: NC GW Criteria: Criteria Source: Turbidity, field N NTU - - pH N SU 8.5 02L Iron T pglL 300 02L Manganese T pglL 50 02L Chromium (VI) T pglL 0,07 DHHS Antimony T pglL 1 IMAC Arsenic T pglL 10 02L Beryllium T pglL 4 1MAC Boron T NgIL 700 02L Chromium T pglL 10 02L Cobalt T pglL 1 IMAC Iran T pglL 300 02L Lead T pg/L 15 02L Manganese T pglL 50 02L Selenium T pg L 20 02L PPBC (Minimum (for ranges)): PPBC: SCREENING ONLY 10 6.65 6.78 - lit - 63 - 0.09 - 1 - 1 - 0.21 - 50 - 5 - 0.5 - 10 - 10 - 63 - 1 Well matrix Event date Result Flag Result Flag Result Flag Result Flag Result Flag Result Flag Result Flag 1 Result Flag 1 Result Flag I Result Flag I Result Flag I Result Flag I Result Flag Result Flag Result Fla MW-308BR WG Round 2 919/2015 6.2 9.3 5300 5400 MW-310BR WG Round 1 6116120115 9.92 377 110 MW-310BR WG Round 2 919/2015 9.1 8.8 410 MW-311BR WG Round 1 6/29/2015 39.18 - - - - 1200 580 MW-311BR WG Round 2 9/1112015 20.6 - - 810 1100 540 MW-314SR lWG Round 1 6/25/2015 7.63 - 380 - MW-314BR WG Round 2 9/11/2015 8.35 - - 1.6 65 - MW-315BR WG Round 1 WIW2015 13.34 - - - - 24.8 2.2 1300 1800 MW-315BR WG Round 2 9/8/2015 21.23 - - 2.6 - MW-317BR WG Round 1 615/2015 3.12 11.44 2.1 11 - MW-317BR WG Round 2 91812015 7.4 11:6 5.6 14.8 - MW-318D WG Round 1 6/2/2015 10.63 5.51 - - 1310 - 13 1 1150 577 MW-318D WG Round 2 9/912015 6.08 5.23 1300 6.7 720 430 MW-9 WG Round 1 6130/2015 84.09 - - - - 6.4 990 1000 MW-9D WG Round 1 612412015 66 - 1000 1.5 2600 600 MW-90 WG Round 2 901I2015 48.29 6.44 - - 1100 2.7 P 1400 1 1100 OW-303D WG Round 2 9112/2015 2.9 55 1000 15.i 53.2 14900 4500 OW-308D WG Round 1 6/25/2015 4.53 6.2 620 - - 36400 580 OW-308D WG Round 2 W 11120151 8.5 6.2 759 34700 690 0W-3100 WG Round 1 6/23/2015 2.28 - - - - 809 1100 - 1.2 1400 1200 - OW-310D WG Round 2 1 9111120151 5.82 - 782 980 1.9 3500 1600 - Notes: 1. This table only shows concentrations of constituents that exceed and regulatory standard or IMAC. 2. If a constituent does not have a regulatory criterion (aluminum, molybdenum, strontlum), it is not shown on this table. Orange Indicates concentration greater than PPBC Green indicates concentration less than PPBC pglL = micrograms per liter SU = standard unit J- = estimated concentration, biased low J = laboratory estimated concentration ,1+= estimated concentration, biased high U = results not detected at 02L = North Carolina groundwater standards as specified In T15A NCAC 02L IMAC = Interim Maximum Allow Concentration N = normal NTU = nephelomethc turbidity unit PPBC = Proposed Provisional Background Concentration PW = porewater T = total WG = groundwater Page 3 of 6 Table 2-10 Constituents of Interest Evaluation Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Constituent: Fraction: Unit: NC GW Criteria: Criteria Source: Thallium T Ng1L 0.2 1MAC Vanadium T Ug1L 0-3 1MAC Aal Dissolved Safi N Ng1L 500000 02L Sulfate N NgIL 250000 02L PPBC (Minimum (for rangesy): PPBC: - 0.2 1 - 260000 - 31000 Well Matrix Event Hate Result Flag Result Flag Result Flag Result Fla AB-10D WG Round 1 E12412015 1-5 - AB-100 WG Round 2 911112015 0.63 J 1320000 - - AB-10S PW Round 1 612612015 0.54 3 - - AB-10S PW Round 2 9/1112015 0.31 3.3 - AB-10SL PW Round 1 6IM2015 14.6 - AB-10SL IPW Round 2 9111/2015 0.44 30.7 AB-15S PW Round 1 6122/2015 3.4 254 - - AB-258R WG Round 1 612612015 - 5.5 AB-25BR WG Round 2 9/1112015 1-7 - AB-250 WG Round 1 612W2015 0.69 J AB-25D WG Round 2 9112/2015 0.64 J - AB-25S PW Round 1 6126/2015 13.3 - AB-25S PW Round 2 9/11/2015 1.5 689 AB-308R WG Round 1 6124/2015 0.91 ij A13_308 R WG Round 2 911012015 0.67 J - AB-30D W G Round 1 6124)2015 0.86 J AB-300 WG Round 2 911112015 1-1 AB-30S WG Round 1 6129/2015 - - AB-30S WG Round 2 9/1012015 18.3 AB-35BR WG Round 1 612512015 1.8 - AB-35BR WG Round 2 9110/2015 11 J 905000 J AB-50 W G Round 1 611812015 0.77 J - - AB-50 WG Round 2 9/912015 AB-5S PW Round 1 6119/2015 0.69 0.62 J - AB-5S PW Round 2 9/9/2015 1.6 33.7 AS-1010 WG Round 1 6181W015 - 15.3 - AS-100 WG Round 2 918/2015 30.6 AS-12S WG Round 1 6/912015 1.1 - AS- 12S WG Round 1 619/2015 _ AS-12S WG Round 2 918/2015 0.52 J - AS-21D WG Round 1 6117/2015 1.6 - - AS-21) WG Round 2 913/2015 - 1.4 - - - AS-40 WG Round 1 6/512015 4.8 - AS-40 WG Round 2 91W2015 AS-61) WG Round 1 6/8/2015 0.69 J-' - AS-60 WG Round 2 9/8/2015 0.4 J - AS-8BR WG Round 1 619/2015 2.7 - AS-88R WG Round 2 915/2015 - - - AS-8D WG Round 1 612/2015 1.8B J - AS-81) WG Round 2 919/2015 - F- BG-11) WG Round 3 11116/2015 45.8 6G-1 D WG Round 4 12/1512015 43 - BG-5D WG Round 1 6123/2015 - - BG-5D WG Round 2 91912015 0.46 J - - BG-51) WG Round 3 11/1612015 - - BG-50 WG Round 4 12/15/2015 - - - - - BG-5S WG Round 1 6/2412015 2.6 SG-5S WG Round 2 9/912015 0.82 J BG-5S WG Round 3 1111612015 0.31 J - BG-5S WG Round 4 1205f2015 - GWA-10D WG Round 1 614/2015 0.256 3.36 - GWA-101) WG Round 1 6/26/2015 - - - - GWA-10D WG Round 2 91BY2015 1.3 GWA-110 WG Round 1 6/512015 1.2 J+ GWA-11D WG Round 2 9/312015 0-45 J - GWA-115 WG Round 1 6110/2015 0.52 J - GWA-11S WG Round 2 9/312015 Oka J - GWA-12D WG Round 1 6/4/2015 5.65 - - GWA-120 WG Round 2 9/912015 3.7 - - GWA-12D WG Round 3 1111912C15 - 3.1 - - - GWA-12D WG Round 4 121M2015 2.3 - GWA-12S WG Round 1 6/412015 - - - - GWA-12S WG Round 2 9/11/2015 0.93 J GWA-12S WG Round 4 12/18/2015 2.4 J+ - GWA-14D WG Round 1 6/30/2015 0.67 J GWA-14D WG Round 2 91912015 0.62 J - GWA-14S WG Round 2 9/912015 0.48 J GWA-150 WG Round 1 613022015 1.5 - 705000 - 307000 GWA-1513 WG Round 2 1 911DY2015 3.2 618000 301000 Page 4 of 6 Table 2-10 Constituents of Interest Evaluation Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Constituent: Fraction: Unit: NC GW Criteria: Criteria Source: Thallium T Ng1L 0.2 IMAC Vanadium T Ug1L 0-3 IMAC AM Dissolved Soli N Ng1L 500000 02L Suitate N Ng1L 250000 02L PPBC (Minimum (tor ranges)): PPBC: - 0.2 1 - 260000 - 31000 Well Matrix Event Date Result Flag Result Flag, Result Flag Result Fla GWA-1D WG Round 1 6111/2015 0.79 J - - GWA-1D WG Round 2 9/8/2015 0.45 J - GWA-1S WG Round 1 6117/2015 1.5 - - GWA-1S WG Round 2 9191W015 0.39 J - GWA-2D WG Round 1 6/10/2015 0.57 J - - GWA-20 1WG Round 2 9/5/2015 0.65 J GWA-2S WG Round 1 6111/2015 1.3 - - GWA-2S WG Round 2 9/4/2015 - - 4.1 - GWA-31) WG Round 1 6/412015 - GWA-3D WG Round 2 9/4/2015 0.6 J - GWA-3S WG Round 1 61412015 GWA-3S WG Round 2 9I412015 0.56 J - GWA-41) WG Round 1 6123/2015 1.5 GWA-4D WG Round 2 9/912015 - 0.53 J - - - GWA-4S WG Round 1 60912015 0.6 1i GWA-4S WG Round 2 911012015 4.3 - GWA-5BR WG Round 1 6116/2015 0.49 J 873000 416000 GWA-5BR WG Round 2 9/9/2015 - - 799000 362000 GW'A-6D WG Round 1 612912015 - - GWA-6D WG Round 2 9/11/2015 - - - GWA-6S WG Round 1 6/30/2015 6.5 - - GWA-6S WG Round 2 9/1212015 1.1 - - - GWA-7D WG Round 1 6/1612015 - GWA-7D WG Round 2 9AW2015 - - - GWA-7S WG Round 1 611912015 0.38 J GWA-7S WG Round 2 9110/2015 - - - GW'A-8D WG Round 1 615/2015 5.2 690000 J- 368000 - GWA-813 WG Round 2 WW2015 1.3 726000 346000 - GWA-8S WG Round 1 6118/2015 U.45 J - GWA-9D WG Round 1 611512015 1.8 - GWA-91) WG Round 2 9/9/2015 - GWA-9D WG Round 3 11116/2015 0.38 J - - GWA-91) WG Round 4 12/1512015 0.39 J - GWA-9S WG Round 1 611912016 5.1 - - - GWA-9S WG Round 2 91912015 0.59 J - - GWA-9S WG Round 3 1111612015 0.65 J GWA-9S WG Round 4 12/15/2015 - 0.74 J - MW-10 1WG Round 2 9111/2015 - - MW-101) WG Round 1 6124/2015 - MW-10D WG Round 2 911112015 - MW-11 WG Round 1 6/29/2015 2.6 - MW-11 WG Round 2 911112015 0.58 J - - MW-11D WG Round 1 612912015 - - MW-11D WG Round 2 9111/2015 0.51 J - - MW-12 WG Round 1 612W2015 2.6 - MW-12 1WG Round 2 919/2015 - - MW-12❑ WG Round i 6120/2015 1.4 MW-12D WG Round 2 919/2015 - - MW-20D WG Round 1 6/24/2015 0.41 J - MW-20S WG Round 1 6/2412015 - - - MW-21D WG Round 1 6123/2015 - 639000 274000 MW-21 D WG Round 2 9/1012015 - 0.72 J 599000 - 269000 - MW-21S WG Round 1 6124/2015 1.5 MW-213 IWG Round 2 911W2015 0.76 J MW-22BR WG Round 1 612512015 0.33 J - - MW-22BR WG Round 2 9111/2015 1.2 - MW-22S WG Round 1 6/2512015 0.74 J - MW-23BR WG Round 1 6/112015 0.55 1,38 - MW-23BR WG Round 2 9/10/2015 - MW-23BR WG Round 4 12/1512015 - 0.31 IJ - - - MW-23❑ WG Round 1 61M2015 - - - MW-23D 1VVG Round 4 12/15/2015 1.2 - - - MW-301BR WG Round i 6MV2015 1-8 MW-301BR WG Round 2 914/2015 0.81 J - MW-303BR WG Round 1 611212015 3.7 MW-303SR WG Round 2 9/412016 2 - MW-306BR WG I Round 1 6112120151 1.6 530000 IOW-306SR WG I Round 2 9/4)20151 1.6 778000 J+ 346000 - MW-308BR WG I Round 1 1 6115120151 0.84 1 J 1 844000 323000 Page 5 of 6 Table 2-10 Constituents of Interest Evaluation Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Constituent: Fraction: Unit: NC GW Criteria: Criteria Source: Thallium T pg/L 0.2 IMAC Vanadium T pg1L 0-3 IMAC AM Dissolved Soli N pgfL 500000 02L Sulfate N pg1L 250000 02L PPBC (Minimum (for rangesf): PPBC: - 0.2 1 - 260000 - 31000 Well Matrix Event Date Result Flag Result Flag Result Flag Result Fla MW-308DR WG Round 2 9/9/2015 - 1300000 586000 - MW-3106R WG Round 1 61IW2015 2.5 - - MW-310BR WG Round 2 919I2015 3.7 - MW-311BR WG Round 1 612912015 0.89 1 - MW-311BR WG Round 2 9111/2015 0.62 J - MW-314BR 1WG Round 1 6/25/2015 1.3 - MW-314BR WG Round 2 9/11)2015 0.02 J - MW-315BR WG Round 1 6119/2015 1 1A I- MW-315BR WG Round 2 918/2015 5.5 MW-31TBR WG Round 1 61512015 8.4 - - MW-317BR WG Round 2 91812015 5.9 MW-3180 WG Round 1 6/2/2015 0.654 J - MW-318D WG Round 2 91912015 _ MW-9 WG Found 1 613U12015 2.3 - - - - - MW-9D WG Round 1 6/24/2015 11.1 MW-90 WG Round 2 9111/2015 23 - - - OW-303D WG Round 2 9112/2015 0.56 36.5 OW-30813 WG Round 1 1 6125/2015 - - - OW-308D WG Round 2 9/11/2015 - - OW-3100 WG Round 1 6/2312015 1.2 - OW-3100 WG Round 2 1 MW20151 3.2 - Notes: 1. This table only shows concentrations of constituents that excee 2. If a constituent does not have a regulatory criterion (aluminum, Orange indicates concentration greater than PPBC Green indicates concentration less than PPBC pg/L = micrograms per liter SU = standard unit J- = estimated concentration, biased low J = laboratory estimated concentration J+ = estimated concentration, biased high U = results not detected at 02L = North Carolina groundwater standards as specified in T15A IMAC = Interim Maximum Allow Concentration N = normal NTU = nephelometric turbidity unit PPBC = Proposed Provisional Background Concentration PW = porewater T = total WG = groundwater Page 6 of 6 Table 2-11 Surface Water Sample Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event. Sample Date: Sample Type Code: Sample Name/ID- SW-1 SW-1 SW-10 SW-10 SW-11 SW-12 SW-13 SW-13 SW-3 Round 1 Round 2 Round 2 Round 2 Round 2 Round 2 Round 2 Round 2 Round 1 5/2712015 9111/2015 9IM2015 9/1412015 911412015 9114/2015 9114/2015 9/14/2015 5/2712015 N N N N N N N N N SW-1 DR-SW-1-NS-3015 DR-SW-10-NS-3015 DR-SW-10-WS-3Q15 DR-SW-11-NS-3Q15 DR-SW-12-NS-3015 DR-SW-I3-NS-30 DR-SW-13-NS-3015 SW-3 Constituent CAS RN' Fraction Criteria Min (range only) 02B Class C Surface Water Criteria Unit Aluminum 7429-90-5 D IL 43 100 U 100 U 100 U 10D U 100 U 12 Aluminum 7429-90-5 T 87 pIL 613 100 U 330 140 69 J 79 J 27600 Antimony 7440-36-0 D IL 1.02 1.1 0.5 U 0.5 U 0.5 U 0.5 U 1 U Antimony 7440-36-0 T 640 pgIL 1.21 0.97 0.16 J 0.6 U 0.5 U 0-5 U 1 U Arsenic 7440-38-2 D 150 pgIL 13.8 31.8 40.4 1.7 1.6 0.93 42.7 Arsenic 7440-38-2 T 10 u IL 15.5 37.9 49.4 2.1 1.8 1 63.7 Barium 7440-39-3 D IL 20 110 34 27 26 23 42 Barium 7440-39-3 T - 200000 IL 18 120 38 30 30 23 267 Beryllium 7440-41-7 D 6.5 pgIL 1 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 1 'U Beryllium 744041-7 T IL 1 U 02 U 0.2 U 0.2 U 0.2 U 0.2 U 1.16 Boron 7440-42-8 D pgIL 180 180 170 120 89 65 128 Boron 744042-8 T - - jjgIL 157 190 160 130 100 62 107 Cadmium 7440-43-9 D 0.15 I&L 1 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 1 U Cadmium 744043-9 T - IL 1 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 1 U Calcium 7440-70-2 T pqIL 19700 20800 2270D 20000 20400 19300 20000 Chromium 744047-3 D 11 jjgIL 1 U 0.25 J 0.26 J 0.2 J 0.2 J 0.34 J 1 U Chromium 7440-47-3 T pqIL 1 U 0.26 J 0.37 J 0.24 J 0.24 J 0.49 J 33.6 Cobalt 7440-48-4 D - pgIL 1 U 0.5 U 0.46 J 0.52 0.59 0.45 J 1 U Cobalt 7440-48-4 T 4 IL 1 U 0.22 J 0.88 D.65 0.9 0,54 15.5 Copper 7440-50-8 D 2.7 pqIL 3.39 J+ 0.52 J 2.8 8.7 J 10.7 2.4 1 UJ Copper 7440-50-8 T IL 4.75 0.3 J 0.63 J 0.54 J 0.61 J 0.65 J 27.3 Iron 7439-89-6 D pgIL 21 50 U 50 U 50 U 50 U 50 U 40 Iron 7439-89-6 T WgIL 323 220 630 310 240 240 42400 Lead 7439-92-1 D 0.54 p IL 1 U 022 0.26 0.85 J _ 1.3 0.19 1 U Lead 7439-92-1 T wgIL 1 U 0.06 J 0.36 0.15 0.14 0.098 J 20.1 Magnesium 7439-95-4 T jjgIL 7240 6680 6680 6390 6610 6370 5850 Manganese 7439-96-5 D wqIL 16 59 400 250 270 150 584 Manganese 7439-96-5 T - IL 9 140 520 280 430 160 1820 Mercu 7439-97-6 T 0.012 IL 0.0011 J+ 0.00778 0.00125 0.000988 0.000792 0.000671 0.00385 J+ Methane 74-82-8 N IL 10 UJ 15 39.1 26.8 45.9 31.4 20 UJ Molybdenum 7439-98-7 D IL 9.11 10.8 9.1 5.7 4.1 2.7 2.56 Molybdenum 7439-98-7 T 2000 IL 9.36 9.7 8.6 6 4.5 2.7 9.85 Nickel 7440-02-0 D 16 IL 1.2 1.6 0.65 0.76 0.75 0.47 J 1 U Nickel 7440-02-0 T - IL 2.5 1.6 0,72 0.62 0.63 0.53 15.9 Potassium 7440-09-7 T IL 3090 5540 3620 J 2800 J 2660 J 5000 U 3710 Selenium 7782-49-2 D - pgIL 2.32 1.9 0.5 U 0.5 U 0.5 U 0-5 U 1 U Selenium 7782-49-2 T 5 pgIL 2.87 2 0.5 U 0.5 U 0.5 U 0.5 U 1 U Sodium 7440-23-5 T IL 11500 8890 13300 12700 11900 11100 10800 Strontium 7440-24-6 D IL 322 290 310 240 220 210 264 Strontium 7440-24-6 T - 40000 pgIL 320 300 300 250 250 200 302 Thallium 7440-28-0 D IL 0.2 U 0.021 J 0.1 U 0.1 U 0.1 U 0.1 U 0.2 U Thallium 7440-28-0 T - 0.47 IL 0.2 U 0.019 J 0.1 U 0.1 U 0.1 U 0.1 U 0.315 Vanadium 7440-62-2 D IL 4.94 2.4 1 U 1 U 1 U 1 U 1.25 Vanadium 7440-62-2 T IL 6.65 2.5 0.98 J 0.8 J 0.85 J 0.57 J 54.1 Zinc 7440-66-6 D 36 pgIL 34 J+ 10 U 8.7 J 1 D U 10 U 12 5 UJ Zinc 7440-66-6 T - wqIL 212 10 U 10 U 10 U 10 U 10 U 93 Total Dissolved Solids TDS N pgIL 140000 136000 144000 135000 127000 124000 120000 Total Organic Carbon TOC N IL 3800 4500 1100 1200 15400 1600 2200 Total Suspended Solids TSS N IL 16000 3500 16000 2800 3500 2600 U 680000 Alkalinity, CO3 ALK-CO3 N - P91L 11000 5000 U 5000 U 5000 U 5000 U 5000 U 10000 U Alkalinity, HCO3 ALK-HCO3 N IL 23000 45400 85400 81900 72000 72800 51000 Alkalinity, lab ALK-LAB N - pgIL 37000 45400 85400 J- 81900 J- 72000 J- 72800 J- 51000 Chloride 16887-00-6 N 230000 IL 11000 8900 11600 11600 11500 11600 11000 Nitrite as N 14797-65-0 N - wqIL 29 - - - - - 76 Nitrogen, NO2 plus NO3 NO2-NO3 N IL 47 28 J 32 25 Sulfate 14808-79-8 N pgIL 53000 40200 20100 18100 14700 12900 23000 Sulfide 18496-25-8 N IL 100 U 100 U 100 U 100 U 100 U 100 U 100 U Arsenic 7440-38-2 T 10 pgIL - - 47.4 - 1.51 J 1.83 0.658 - - Chromium 7440-47-3 T IL 0.474 J 1 J 0.69 J 0.386 J Iron 7439-89-6 T kjqIL 155 J 216 J 199 J 195 J Manganese 7439-96-5 D WgIL 434 J 232 J 266 J 141 J Manganese 7439-96-5 T _ IL - 425 J 277 J 291 J 156 J As III 7784-46-5 T WgIL 19.7 0.841 J 0.971 0.516 As V 10103-60-3 T Il- - 27.7 0.668 J 0.857 0.5 U Chromium I 18540-29-9 T IL 0.012 J 0.018 J 0.016 J 0.019 J Fe II 1345-25-1 T IL - 30 UJ 11.4 J 30 UJ 16.1 J Fe III 1309-37-1 T pgIL Mn II 134443-0 T jjgIL - Page 1 of 6 Table 2-11 Surface Water Sample Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Namelll SW-1 SW-1 SW-10 SW-10 SW-11 SW-12 SW-13 SW-13 SW-3 Round 1 Round 2 Round 2 Round 2 Round 2 Round 2 Round 2 Round 2 Round 1 5/2712015 9111/2015 9IM2015 9/1412015 911412015 9114/2015 9114/2015 9/14/2015 5/2712015 N N N N N N N N N SW-1 DR-SW-1-NS-3015 DR-SW-10-NS-3015 DR-SW-10-WS-3Q15 DR-SW-11-NS-3Q15 DR-SW-I2-NS-3015 DR-SW-I3-NS-30 DR-SW-13-NS-3415 SW-3 Constituent CAS RN Fraction Criteria Min (range only) 02B Class C Surface Water Criteria Unit Mn IV 1313-13-9 T IL Se IV 10102-18-8 T pg1L - 2 U - 2 U 2 U 2 U Se(VI) 13410-01-0 T IL 2 U 2 U 2 U 2 U Dissolved Oxygen DO N L - 2.5 7.76 Temperature TEMP N Deg C 27.4 16.2 H PH N 6 9 SU - 7.3 7.4 - Turbidity, field TURB N NTU 5.61 8.85 Specific Conductivit field SC N Sicm 219.1 200:9 - Oxidation Reduction Potential ORP N mV 125.7 148.8 Notes: pglL = micrograms per liter pSlcm = microsiemens per centimeter ft = feet mglL = milligrams per liter mV = millivolts NTU - nephelometrio turbidity units pCVL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+= estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L = North Carolina groundwater standards as specified in T15A NCAC 02L ❑ = dissolved Deg C = degree Celsius ❑HHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 2 of 6 Table 2-11 Surface Water Sample Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: SW-3 SW-3 SW-4 $W-4 SW4 SW-5 SW-5 SW-5 SW-6 Round 1 Round 2 Round 1 Round 1 Round 2 Round 1 Round 1 Round 2 Round 1 611812015 9111/2015 5127/20/5 6/18/2015 9/1112015 5/27/2015 611812015 9/1112015 613012015 N N N N N N N N N SW-3 DR-SW-3-NS-3015 SW-4 SW-4 DR-SW-4-NS-3Q15 SW-5 SW-5 DR-SW-5-NS-3015 SW-6 Constituent CAS RN' Fraction Criteria Min (range only) 02B Class C Surface Water Criteria Unit Aluminum 7429-90-5 D IL 100 J 5 U 100 U 5 U 100 U Aluminum 7429-90-5 T 87 pIL 250 127 63 J 90 100 U - Antimon 7440-36-0 D IL 0.5 J 1 U 0.5 U 1 U 0.41 J 0.17 J Antimony 7440-36-0 T 640 pgIL - 0.5 U 1 U 0.6 U 1 U 0.45 J 0.16 J Arsenic 7440-38-2 D 150 pgIL 1.7 1 U 0.29 J 1 U 0.42 J 0.17 J Arsenic 7440-38-2 T 10 u IL 2 1 U 0.14 J 1 U 0.48 J 0,24 J Barium 7440-39-3 D IL 27 18 20 24 17 19 Barium 7440-39-3 T - 200000 IL - 34 18 22 25 18 25 Beryllium 7440-41-7 D 6.5 pgIL 0.2 U 1 U 0.2 U 1 U 0.2 U 0.2 U Beryllium 744041-7 T IL - 0.2 U 1 U 0.2 U 1 U 0.2 U 02 U Boron 7440-42-8 D pgIL 120 50 U 35 J 58 74 150 Boron 744042-8 T - - jjgIL 120 50 U 29 J 57 72 160 Cadmium 7440-43-9 D 0.15 uaIL 0.08 U 1 U 0.08 U 1 U 0.08 U 0.08 U Cadmium 744043-9 T - IL 0.08 U 1 U 0.08 U 1 U 0.08 U 0.08 U Calcium 7440-70-2 T pqIL 20800 14000 19500 13800 10700 6300 Chromium 744047-3 D 11 IL - 0.21 J 1 U 024 J 1 U 0.25 J 0.49 J Chromium 7440-47-3 T IL 0.64 1 U 0.3 J 1 U 0.63 0.67 Cobalt 7440-48-4 D - IL 0.45 J 1 U 0.6 U 1 U 0.16 J 0.15 J Cobalt 7440-48-4 T 4 IL 0,87 1 U 0.18 J 1 U 0.21 J 0.48 J Copper 7440-50-8 D 2.7 p IL 8.6 7.38 J+ 8.1 1 U 4.6 2.2 Copper 7440-50-8 T IL 0.83 J 1 U 0.71 J 4.62 J+ 1.2 J+ 1.6 Iron 7439-89-6 D pgIL - 30 J 33 26 J 68 30 J - Iron 7439-89-6 T WgIL 580 339 170 412 290 Lead 7439-92-1 D 0.54 p IL 1.1 1 U 1 1 U 0.38 0.2 Lead 7439-92-1 T wgIL 0.37 1 U 0.087 J 1 U 0.14 0.88 Magnesium 7439-954 T jjgIL - 6160 4390 5940 5500 4110 2560 Manganese 7439-96-5 D PqIL 210 90 23 315 89 22 Manganese 7439-96-5 T - IL - 300 93 46 290 98 83 Mercu 7439-97-6 T 0.012 IL 0.0019 J+ 0.000978 J+ 0.00202 J+ 0.0012 J+ 0.00222 J+ 0.00334 J+ Methane 74-82-8 N IL 26.1 10 UJ 6.1 J+ 10 UJ 47 J 9.9 J+ Molybdenum 7439-98-7 D IL 5.9 1 U 0.49 J 1 U 0.61 0.39 J Molybdenum 7439-98-7 T 2000 IL 5.3 1 U 0.46 J 1 U 0.59 0.26 J Nickel 7440-02-0 D 16 IL 0.76 1 U 0.48 J 1 U 0.36 J 0.78 Nickel 7440-02-0 T - IL - 0.96 1 U 0.36 J 1 U OA5 J+ 0.67 Potassium 7440-09-7 T IL 2810 J 1410 500 U 2230 2510 J 5000 U Selenium 7782-49-2 D - pgIL - 0.5 U 1 U 0.5 U 1 U 0-5 U 0.5 U Selenium 7782-49-2 T 5 pgIL 0.5 U 1 U 0.5 U 1 U 0.5 U 0.5 U Sodium 7440-23-5 T IL 13000 8640 10600 9210 7210 4010 J Strontium 7440-24-6 D IL 260 143 210 134 97 42 Strontium 7440-24-6 T - 40000 pgIL 270 151 200 143 100 45 Thallium 7440-28-0 D IL 0.1 U 0.2 U 0.1 U 0.2 U 0.1 U 0.025 J Thallium 7440-28-0 T - 0.47 IL - 0.1 U 0.2 U 0.1 U 0.2 U 0.1 UJ 0.1 U Vanadium 7440-62-2 D IL 0.78 J 0.3 U 0.55 J 0.3 U 0.5 J 1.2 Vanadium 7440-62-2 T IL - 1.1 0.567 1 U 0.42 0.33 J 2.8 Zinc 7440-66-6 D 36 pgIL 10 U 17 J+ 10 U 5 UJ 10 U 4.7 J Zinc 7440-66-6 T - wqIL 10 U 5 U 10 U 5 U 10 U 5 J+ Total Dissolved Solids TDS N pgIL 149000 97000 126000 110000 83000 72000 Total Organic Carbon TOC N IL - 1600 1500 2200 2700 4000 3300 Total Suspended Solids TSS N IL 13100 5000 U 3900 5000 J 2500 U 24700 Alkalinity, CO3 ALK-CO3 N - P91L - 5000 U 10000 U 5000 U 10000 U 5000 U 5000 U Alkalinity, HCO3 ALK-HCO3 N IL 69600 52000 67100 50DOO 34700 17600 Alkalinity, lab ALK-LAB N IL - 69600 52000 67100 50000 34700 17600 Chloride 16887-DO-6 N 230DOO IL 12900 10000 13900 13000 9400 9400 Nitrite as N 14797-65-0 N - wqIL - 145 - 300 - - Nitro en, NO2 plus NO3 NO2-NO3 N IL 110 J- 260 Sulfate 14808-79-8 N - pgIL 15300 5900 5500 10000 6900 5100 Sulfide 18496-25-8 N IL 10O U 100 U 100 U 100 U 100 U 100 U Arsenic 7440-38-2 T 10 pgIL - - - - - - - Chromium 7440-47-3 T IL Iron 7439-89-6 T pgIL - Manganese 7439-96-5 D wgIL Manganese 7439-96-5 T _ IL - - - - - As III 7784-46-5 T WgIL 11 0.054 0.144 As V 10103-60-3 T IL 15.6 0.083 - 0.208 Chromium I 18540-29-9 T IL 0.019 0.029 0.017 Fe II 1345-25-1 T IL 27.9 9.3 - 30-2 Fe III 1309-37-1 T IL 51.5 J+ 11.7 J+ 28.1 J+ Mn II 1344�3 0 T IL 242 J- 4$.3 J- - 239 J- Page 3 of 6 Table 2-11 Surface Water Sample Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event. Sample Date: Sample Type Code: Sample Name/ID: SW-3 SW-3 SW-4 $W-4 SW4 SW-5 SW-5 SW-5 SW-6 Round 1 Round 2 Round 1 Round 1 Round 2 Round 1 Round 1 Round 2 Round 1 611812015 9111/2015 5127/20/5 6/18/2015 9/1112015 5/27/2015 611812015 9/1112015 613012015 N N N N N N N N N SW-3 DR-SW-3-NS-3015 SW-4 SW-4 DR-SW-4-NS-3Q75 SW-5 SW-5 DR-SW-5-NS-3015 SW-6 Constituent CAS RN Fraction Criteria Min (range only) 02B Class C Surface Water Criteria Unit Mn IV 1313-13-9 T IL 15.3 8.9 12.1 Se IV 10102-18-8 T pg1L 0.5 U 0.5 U - 0.5 U Se(VI) 13410-01-0 T IL 0.5 U 0.5 U 0.5 U Dissolved Oxygen DO N L - 5.57 - 7.27 - 4.7 7.73 Temperature TEMP N Deg C 19.9 20.2 22.7 29.9 H PH N 6 9 SU - 7.4 7.2 6.74 7.12 Turbidity, field TURB N NTU 9.38 7.95 3.91 46.47 Specific Conductivit field SC N Sicm 215.9 194.1 128 50.2 Oxidation Reduction Potential 1 ORP N mV 111.8 158.7 1 143.8 157.8 Notes: pg1L = micrograms per liter pS1cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter mV = millivolts NTU - nephelometrEc turbidity units pCVL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+= estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (s 02L = North Carolina groundwater standards as specified in T15A NCAC 02L ❑ = dissolved Deg C = degree Celsius ❑HHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 4 of 6 Table 2-11 Surface Water Sample Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: SW-6 SW-7 SW-7 SW-8 SW-8 SW-9 SW-9 Round 2 Round 1 Round 2 Round 1 Round 2 Round 1 Round 2 911012015 613012015 9110/2015 6130/2015 9/1012015 512712015 9111/2015 N N N N N N N DR-SW-6-NS-3015 SW-7 DR-SW-7.NS-3015 SW-8 DR-SW-$-NS-3Q15 SW-9 DR-SW-9-NS-3015 Criteria Min 02B Class C (range Surface Water Constituent CAS RN' Fraction only) Criteria Unit Aluminum 7429-90-5 D IL 100 U 100 U 100 U 5 U 100 U Aluminum 7429-90-5 T 87 pgIL 380 - 550 - 320 129 360 Antimony 7440-36-0 D pqIL 0.18 J 0.2 J 0.21 J 0.5 U 0.23 J 1 U 0.58 Antimony 7440-36-0 T 640 IL 0.6 U 0.22 J 0.5 U 0.5 U 0.6 U 1 U 0.72 Arsenic 7440-38-2 D 150 pgIL 0.21 J 0.14 J 0.21 J 0.14 J 0.33 J 46.3 59 Arsenic 7440-38-2 T 10 P91L 0.37 J 0.24 J 0.35 J 022 J 0.2 J 51.1 75.9 Barium 7440-39-3 D IL 20 18 20 19 20 88 92 Barium 7440-39-3 T - 200000 kjqtL 26 29 25 24 24 99 120 Beryllium 7440-41-7 D 6.5 IL 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 1 U 0.2 U Beryllium 744041-7 T - pgIL 02 U 0.2 U 0.2 U 0.2 U 0.2 U 1 U 0.111 Boron 7440-42-8 D jigIL 220 130 190 170 130 360 380 Boron 744042-8 T - P91L 240 130 180 180 160 364 400 Cadmium 7440-43-9 D 0.15 WgIL 0.08 U 0.08 U 0,08 U 0.08 U 0.08 U 1 U 0.08 U Cadmium 744043-9 T PgIL 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 1 U 0.08 U Calcium 7440-70-2 T L 8020 5910 7770 6340 7850 45400 51600 Chromium 744047-3 D 11 pgIL 0.3 J+ 0�24 J 0.24 J+ 0.46 J 0.84 J+ 1 U 0.45 J Chromium 7440-47-3 T iluaVIL 0.87 0.68 0.9 0.59 0.41 J 1 U 1 Cobalt 7440-48-4 D - pgIL 0.6 U 0.5'U 0.13 J 0.5 U 0.43 J 1 U 0.5 U Cobalt 7440-48-4 T 4 IL 0.42 J 0.51 0.47 J 0.32 J 0.16 J 1 U 0.74 Copper 7440-50-8 D 2.7 pgIL 12 J+ 2 2.8 J+ 2.8 1.6 J+ 1 U 0.23 J Copper 7440-50-8 T IL 1.4 J+ 1.8 1.5 J+ 1.3 3 J+ 5.11 J+ 1.7 Iron 7439-89-6 D pgIL 140 - 41 J - 29 J IOU 50 U Iron 7439-89-6 T pgIL 1000 1200 800 140 550 Lead 7439-92-1 D 0.54 lj IL 0.26 J+ 0.088 J 0.21 J+ 0.061 J 0.62 J+ 1 U 0.1 U Lead 7439-92-1 T - IL 0.73 0.97 0.77 0.64 0.2 J+ 1 U 0.83 Magnesium 7439-95-4 T IL 3380 2480 3310 2580 3280 13500 14300 Manganese 7439-96-5 D pqIL 52 16 50 15 63 35 5 U Manganese 7439-96-5 T IL 83 98 81 55 94 154 230 Mercu 7439-97-6 T 0.012 pqIL 0.00194 J+ 0.00357 J+ 0.00201 J+ 0.00296 J+ 0.00187 J+ 0.000949 J+ 0.0011 J+ Methane 74-82-8 N IL 17.4 J+ 9.6 J+ 11.7 J+ 16.3 J+ 35.5 J+ 10 UJ 16.4 Molybdenum 7439-98-7 D L 0.63 0.41 J 0.62 0.43 J 0.59 7.62 9.4 Molybdenum 7439-98-7 T 2000 UaIL 0.65 0.26 J 0.56 026 J 0.72 7.65 9.8 Nickel 7440-02-0 D 16 L 0.35 J+ 0.58 0.33 J+ 1.6 0.59 J+ 1 U 0.7 Nickel 7440-02-0 T IL 0.58 J+ 0.6 0.64 J+ 0.47 J 0.48 J+ 1.16 1.6 Potassium 7440-09-7 T L 2510 J 5000 U 2570 J 5000 U 2630 J 4690 5840 Selenium 7782-49-2 D - pgIL 0.5 U 0.5 U 0.5 U 0.5 U 0.6 U 1 U 0.36 J Selenium 7782-49-2 T 5 pgIL 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 1 U 0.45 J Sodium 7440-23-5 T - vgIL 6230 4260 J 6900 3900 J 7560 17000 18700 Strontium 7440-24-6 D IL 57 41 54 43 53 883 1000 Strontium 7440-24-6 T - 40000 PgIL 57 45 52 46 52 895 1100 Thallium 7440-28-0 D L 0.1 U 0.1 U 0.1 U 0.1 U 0.018 J 0.2 U 0.017 J Thallium 7440-28-0 T - 0.47 jjgIL 0.022 J 0.1 U 0.025 J 0.1 U 0.1 U 0.2 U 0.036 J Vanadium 7440-62-2 D IL 1 0.85 J 0.96 J 0.69 J 2.6 0.701 1.1 Vanadium 7440-62-2 T IL 3 3.1 3.1 2.5 1 0:947 2.7 Zinc 7440-66-6 D 36 pqIL 10 UJ 10 U 13 J+ 10 U 13 J+ 18 J+ 10 U Zinc 7440-66-6 T - IL 10 U 20 J+ 10 U 4.6 J+ 61 10 16 Total Dissolved Solids TDS N pqIL 71000 74000 63000 73000 J 68000 270000 290000 Total Organic Carbon TOC N pgIL 2400 3500 2600 5900 2400 2100 1600 Total Suspended Solids TSS N pqIL 16100 24500 17100 19200 13300 32000 35200 Alkalinity, CO3 ALK-CO3 N - pgIL 6000 U 5000 U 5000 U 5000 U 5000 U 10000 U 5000 U Alkalinity, HCO3 ALK-HCO3 N IL 22500 16800 24200 18300 23200 100000 114000 Alkalinity, lab ALK-LAB N - IL 22500 16800 24200 18300 23200 100000 114000 Chloride 16887-00-6 N 230000 IL 13000 9400 12100 9800 11600 13000 14500 Nitrite as N 14797-65-0 N - IL - - - - - 132 - Nitro en, NO2 plus NO3 NO2-NO3 N L 380 310 460 270 650 210 J- Sulfate 14808-79-8 N - PqIL 5000 5000 5300 5000 5300 90000 90300 Sulfide 18496-25-8 N - L 100 U 100 U 100 U 100 U 100 U 100 U 100 U Arsenic 7440-38-2 T 10 pgIL - - - - - - - Chromium 7440-47-3 T L Iron 7439-89-6 T L - - Manganese 7439-96-5 D wCJIL Manganese 7439-96-5 T IL - - - As III 7784-46-5 T pqIL As V 10103-60-3 T IL - - Chromium I 18540-29-9 T pqIL Fe II 1345-25-1 T pgIL - - Fe III 1309-37-1 T ILL 1344�30 T - Page 5 of 6 Table 2-11 Surface Water Sample Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: SW-6 SW-7 SW-7 SW-8 SW-8 SW-9 SW-9 Round 2 Round 1 Round 2 Round 1 Round 2 Round 1 Round 2 911012015 613012015 9110/2015 6130/2015 9/1012015 512712015 9111/2015 N N N N N N N DR-SW-6-NS-3015 SW-7 DR-SW-7.NS-3015 SW-8 DR-SW-$-NS-3Q15 SW-9 DR-SW-9-NS-3015 Constituent CAS RN Fraction Criteria Min (range only) 02B Class C Surface Water Criteria Unit Mn IV 1313-13-9 T IL Se IV 10102-18-8 T pg1L - - Se(VI) 13410-01-0 T I ua/L Dissolved Oxygen DO N mc#L - 7.68 T95 619 5.8 7.8 Temperature TEMP N Deg C 24.6 25.6 23.7 25.4 28.5 H PH N 6 9 SU - 7.12 7.3 6.97 6.9 7.6 Turbidity, field TURB N NTU 46.71 35.29 33.08 24.02 17.9 Specific Conductivity field Sc NVS/cm 1 1 49 120.1 502 123.1 453.9 Oxidation Reduction Potential ORP N mV 1 1 199.9 157.3 203.7 193.8 90.3 Notes: pg1L = micrograms per liter pS1cm = micros iemens per centimeter It = feet mg1L = milligrams per liter mV = millivolts NTU - nephelometrio turbidity units pCVL = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+= estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (s 02L = North Carolina groundwater standards as specified in T15A NCAC 02L ❑ = dissolved Deg C = degree Celsius ❑HHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 6 of 6 Table 2-12 Areas of Wetness Sampling Analytical Results - Rounds 1, 2, and 3 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NamellD: S-1 S-1 S-1 S-2 S-3 S.6 Round 1 Round 1 Round 2 Round 2 Round 2 Round 3 512712015 612612015 9/12/2015 9/14/2015 9/14/2015 1112412015 N N N N N N S-1 S-1 DR-S.1-NS-3015 DR-S-2-NS-3015 DR-S-3-NS-3015 DR-S-E-NS-4Q15-1 Constituent CAS RN Fraction Criteria Min (range (range only) NCDE002L GWQS, MI DHHS Criteria Source Unit Aluminum 7429-90-5 D IL 5 U 10O U 100 U 100 U 100 U Aluminum 7429-90-5 T pgIL 3410 4300 280 640 120 Antimony 7440-36-0 D - IL 1 U 0.34 J 0.5 U 0.25 J 0.5 U Antimony 7440-36-0 T 1 IMAC pgIL 1 U 0.45 J 0.5 U 0.26 J 0.5 U Arsenic 7440-38-2 D - p IL 1 U 7.5 0.5 lJ 1.7 207 Arsenic 7440-38-2 T 10 02L p IL 1.68 14.1 0.16 J 2.3 204 J+ Barium 7440-39-3 D - p IL 20 50 40 55 50 Barium 7440-39-3 T 700 02L jjqIL 54 160 42 62 53 Be lium 7440-41-7 D - wqIL 1 U 0.2 U 0.2 U 0.2 U 0.2 U Beryllium 7440-41-7 T 4 IMAC pqIL 1 U 1.1 0.2 U 0.2 U 0.2 U Boron 7440-42-8 D - p IL 50 U 290 220 260 280 Boron 7440-42-8 T 700 02L pqIL 50 U 240 210 260 300 Cadmium 7440-43-9 D IL 1 U 0.08 U 0.08 U 0.08 U 0.08 U Cadmium 7440-43-9 T 2 02L pgIL 1 U 0.085 0.08 U 0.08 U 0.08 U Calcium 7440-70-2 T IL 14400 25200 J- 16900 21000 29800 Chromium 7440-47-3 ❑ - pqIL 1 U 0.22 J+ 0.21 J 0.39 J 0.25 J+ Chromium 7440-47-3 T 10 02L IL 3.86 17.6 0.28 J 0.42 J 0.81 J+ Cobalt 7440-48-4 D IL 1 U 3.1 J+ 0.37 J 1.1 0.7 Cobalt 7440-48-4 T 1 IMAC p IL 4.88 17.5 0.5 J 1.9 0.88 Copper 7440-50-8 ❑ - pgIL 5.62 1.4 J+ 1 U 1 A 1 U Copper 7440-50-8 T 1000 02L IL 6.15 J+ 13.4 J+ 0.24 J 0.43 J 0.41 J Iron 7439-89-6 D IL 18 190 50 U 36 J 140 Iron 7439-89-6 T 300 02L p IL 5720 7700 390 970 330 Lead 7439-92-1 D IL 1 U 0.16 J+ 0.052 J 0.11 0.051 J+ Lead 7439-92-1 T 15 02L p IL 3.97 16.2 0.28 0.71 0.25 Magnesium 7439-954 T IL 4500 8430 5260 5860 6690 Manganese 7439-96-5 D p IL 107 640 87 350 1100 Manganese 7439-96-5 T 50 02L p IL 829 940 89 380 1100 Mercury 7439-97-6 T 1 02L IL 0.0005 UJ 0.00845 0.00154 0.00583 0.00231 J+ Methane 74-82-8 N - pq1L 1 10 UJ 219 16.6 143 161 J Molybdenum 7439-98-7 ❑ P91L 1.25 18.9 0.33 J 15.2 21.1 Molybdenum 7439-98-7 T pqIL 1.57 12.3 0.31 J 13.6 18.8 Nickel 7440-02-0 D IL 1 U 1 J+ 0.36 J 0.81 0.64 Nickel 7440-02-0 T 100 02L pqIL 3.3 10.6 J+ 0.39 J 0.86 0.91 J+ Potassium 7440-09-7 T - p IL 1590 4120 J 4800 J 5270 5820 Selenium 7782-49-2 D IL 1 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium 7782-49-2 T 20 02L pgIL 1 U 2.1 0.5 U 0.5 U 0.5 U Sodium 7440-23-5 T IL 9070 16900 13800 15400 15100 Strontium 7440-24-6 ❑ IL 157 330 240 300 460 Strontium 7440-24-6 T PqIL 166 380 240 300 470 Thallium 7440-28-0 D - p IL 0.2 J 0.1 J 0.022 J 0.1 J 0.1 U Thallium 7440-28-0 T 0.2 IMAC pqIL 0.2 U 0.16 0.031 J 0.044 J 0.028 J+ Vanadium 7440-62-2 D IL 0.3 U 1.6 1 U 0.3 J 0.35 J Vanadium 7440-62-2 T 0.3 IMAC p IL 8.06 41.8 0.52 J 1.7 0.89 J Zinc 7440-66-6 D - wqIL 11 J+ 13 J+ 6.7 J 10 10 u Zinc 7440-66-6 T 1000 021- pqIL 17 26 6.6 J 10 U 10 U Total Dissolved Solids TDS N 500000 02L p IL 99000 154000 128000 127000 158000 Total Organic Carbon TOC N IL 2100 6700 900 J 650 J 670 J+ Total Suspended Solids TSS N 11- 180000 4360000 3700 44000 24700 Alkalinity. CO3 ALK-CO3 N pgIL 10000 LI 5000 UJ 5000 U 5000 U 5000 t1 Alkalinity, HCO3 ALK-HCO3 N JqIL 51000 72500 39300 56700 107000 Alkalinity, lab ALK-LAB N - IL 51000 72500 39300 J- 56700 J- 107000 Chloride 16887-00-6 N 250000 02L IL 10000 11800 11700 11700 10700 Nitrite as N 14797-65-0 N 1000 02L IL 117 - Nitro en, NO2 plus NO3 NO2-NO3 N IL - 20'U 28 34 140 Sulfate 14808-79-8 N 250000 02L ppIL 9400 32600 34600 29100 18100 Sulfide 18496-25-8 N IL 200 U 100 U 100 U 100 U 100 U Arsenic 7440-38-2 T 10 02L p IL - - 0.275 J 1.17 J- 214 Chromium 7440-47-3 T 10 02L IL 0.56 J 1.36 J 1.32 Iron 7439-89-6 T 300 02L p IL 212 J 237 J 1520 J Manganese 7439-96-5 D IL - 83.3 J 381 J 1120 Manganese 7439-96-5 T 50 02L p IL - 77.4 J 380 J 2100 J As(III) 7784-46-5 T - IL 0.402 0.156 J 0.889 146 As V 10103-60-3 T IL 0.195 0.5 U 0.279 J 67.5 Chromium (VI) 18540-29-9 T 0.07 DHHS p IL 0.022 J+ 0.011 J 0.0092 J 0.016 J- Fe II 1345-25-1 T IL 20 U 32.5 J 27.8 J 166 J Fe Ili 1309-37-1 T IL 29.9 - - - Mn II 1344-43-0 T IL 229 IV 1313-13-9 T 1 UJMn - - Page 1 of 2 Table 2-12 Areas of Wetness Sampling Analytical Results - Rounds 1, 2, and 3 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NamellD: S-1 S-1 S-1 S-2 S-3 S-6 Round 1 Round 1 Round 2 Round 2 Round 2 Round 3 512712015 612612015 9/12/2015 9/14/2015 9/14/2015 1112412015 N N N N N N S-1 S-1 DR-S-I-NS-3015 DR-S-2-NS-3015 DR-S-3-NS-3015 DR-S-E-NS-4Q15-1 Constituent CAS RN Fraction Criteria Min (range only) NCDEQ 02L GWQS, IMACs, DHHS Criteria Source Unit Se(IV) 10102-18-8 T IL 0.5 lJ 2 U 2 U 2 U Se Vl) 13410-01-0 T 1L 0.5 U - 2 U 2 U 2 U Dissolved Oxygen DO N m iL 7,02 2.3 4.71 7.02 - Temperature TEMP N - Deg C 24.9 17.1 17.3 17.1 H PH N 6.5 8.5 02L SU 7,65 7.5 6.89 7.1 - ITurbidity, field TURB N NTU 5,17 19.74 71 45.89 S ecific Conductiv�it field SC N Slcm 173.8 255.7 18 207.8 - Oxidation Reduction Potential ORP N 1 208.6 1 127.9 112 139.3 Notes: pg1L = micrograms per liter pSfcm = microsiemens per centimeter It = feet mg1L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCVL. = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 028 = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOG = total organic carbon Page 2 of 2 Table 2-13 NCDEQ Sample Location Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample Name/ID: CCSW001 CCSW001 CCSWO02OUT DRRC001 DRRC001 Round 1 Round 1 Round 2 Round 1 Round 2 71112015 7/112015 911412015 711/2015 911412015 FD N N N N CCSWOUI-DUP CCSW001 DR-CCSW002OUT-NS-3Q1 DRRC001 DR-DRRC001-NS-3Q15 Constituent CAS RN Fraction SWQS Criteria NCDEQ 02S GWQS Criteria. NCDEQ 02L Unit Aluminum 7429-90-5 D - - wit. - 100 U 100 U Aluminum 7429-90-5 T - 87 - - IL - 3500 - 2300 Antimony 7440-36-0 D - - - - /L 0.3 J 0.5 U 0.5 U 0.5 U Antimony 7440-36-0 T - 640 - 1 1L 0,24 J 0.5 U 0.5 U 0.5 U Arsenic 7440-38-2 D - 150 - - 1L 0.42 J 0.16 J 0.32 J 0.38 J Arsenic 7440-38-2 T - 10 - 10 1L 0.35 J 0.58 0.35 J 1.9 Barium 7440-39-3 D - - - - 1L - 27 72 50 46 Barium 7440-39-3 T - 200000 700 1L - 33 120 53 86 Beryllium 7440-41-7 D - 6.5 - 1L - 0.2 U 0.2 U 0.2 U 0.2 U Beryllium 7440-41-7 T - - 4 fL - 0.2 U 0.21 0.2 U 0.25 Boron 7440-42-8 D - - - - 1L - 50 U 39 J 130 160 Boron 7440-42-8 T - - 700 1L - 28 J+ 38 J 130 J+ 160 Cadmium 7440-43-9 D - 0.15 - 1L - 0.08 U 0.08 U 0.08 U 0.08 U Cadmium 7440-43-9 T - - - 2 1L - 0.08 U 0.08 U 0.08 U 0.05 J Calcium 7440-70-2 1 T - - - 1L - 14700 30800 19000 19800 Chromium 7440-47-3 D 11 - 1L - 0.44 J 0.33 J 0.32 J 0.2 J Chromium 7440-47-3 T - - 10 1L - 0.22 J 2 0.25 J 0.93 Cobalt 7440-48-4 D - - - /L - 0.32 J 0.31 J 1.4 0.63 Cobalt 7440-484 T 4 - 1 /L - 0.34 J 4.6 1.5 3.6 Copper 7440-50-8 D 2.7 - - 1L - 0.88 J 7.5 0.45 J 7.3 Copper 7440-50-8 T - - 1000 IL - 0.95 J 3.8 0.49 J 2.4 Iron 7439-89-6 D - - - 1L - - 50 U - 100 Iron 7439-89-6 T - - 300 1L - - 5200 - 9900 Lead 7439-92-1 D 0.54 - - /L - 0.12 0.78 0.1 U 0.76 Lead 7439-92-1 T - 15 1L - 0.09 J 1.6 0.092 J 2.5 Magnesium 7439-95-4 T - - 1L - 2210 11700 12200 13300 Manganese 7439-96-5 D - - IL - 83 250 2100 1000 Manganese 7439-96-5 T - 50 1L - 160 1400 2200 1500 Mercury 7439-97-6 T 0.012 1 1L - 0.000623 0.011 0,000684 0.0425 Methane 74-82-8 N - - IL - 8 J+ 2.6 J+ 23.7 30.5 Molybdenum 7439-98-7 D - - - 1L - 1.5 0.47 J 0.36 J 0.33 J Molybdenum 7439-98-7 T 2000 - 1L - 1.4 0.5 U OX J 0.15 J Nickel 7440-02-0 D 16 - 1L - 0.54 1 1.7 1.3 Nickel 7440-02-0 T - 100 1L - 0.7 3.7 1.9 2.6 Potassium 7440-09-7 T - - 1L - 4750 J 12200 5000 U 5000 U Selenium 7782-49-2 ❑ - - 1L - 0.85 0.5 U 0.5 U 0.5 U Selenium 7782-49-2 T 5 20 1L - 0.5 U 0.5 U 0.5 U 0.5 U Sodium 7440-23-5 T - - - 1L - 11100 12200 19400 21000 Strontium 7440-24-6 ❑ - - - 1L - 65 160 240 230 Strontium 7440-24-6 T - 40000 - 1L - 68 170 250 270 Thallium 7440-28-0 D - - - 1L - 0.091 J 0.1 U 0.1 U 0.1 U Thallium 7440-28-0 T - 0.47 0.2 1L - 0.025 J 0.1 U 0.036 J 0.026 J Vanadium 7440-62-2 D - - - 1L - 0.56 J 0.49 J 1 U 1 U Vanadium 7440-62-2 T - 0.3 1L - d.55 J 3.3 0.29 J 2.6 Zinc 7440-66-6 D 36 - 1L - 10 U 5.3 J 6.8 J 5 J Zinc 7440-66-6 T - - 1000 IL - 10 U 33 5 J 36 Total Dissolved Solids TDS N - - 500000 fL - 112000 177000 186000 185000 Total Organic Carbon TOC N - - - 1L - 6000 2500 12500 2700 Total Suspended Solids TSS N - - - 1L - 4200 U 183000 2500 U 363000 Alkalinity, CO3 ALK-0O3 N - - - 1L - 5000 U 5000 U 5000 U 5000 UJ Alkalinity, HCO3 ALK-HCO3 N - - - 1L - 22300 117000 70900 82000 Alkalinity, lab ALK-LAB N - - - 1L - 22300 117000 70900 82000 Chloride 16887-00-61 N 230000 - 250000 1L - 16400 7000 12600 14000 Nitrogen, NO2 plus NO3 NO2-NO3 N - - - - wq1L - 22 300 170 110 Sulfate 14808-79-8 N - - - 250000 1L - 22900 15400 38400 46000 Sulfide 18496-25-8 N - - - 1L - 100 U 100 U 100 U 100 U Arsenic 7440-38-2 T 10 - 10 1L - - 0.5 U - 0.203 J Chromium 7440-47-3 T - - 10 /L - - 1.54 J+ - 1.54 J+ Page 1 of 2 Table 2-13 NCDEQ Sample Location Analytical Results - Round 1 and Round 2 Corrective Action Plan Part 2 Dan River Steam Station Ash Basin Location: Event: Sample Date: Sample Type Code: Sample NameIID: CCSW001 CCSW001 CCSWO02OUT DRRC001 DRRC001 Round 1 Round 1 Round 2 Round 1 Round 2 7/1/2015 7/1/2015 911412015 71112015 911412015 FD N N N N CCSW001-DUP CCSW001 DR-CCSW0020UT-NS-3Q1 5 DRRC001 DR-DRRC001 -NS-3Q1 5 Constituent CAS RN Fraction SWQS Criteria NCDEQ 02B GWQS Criteria NCDEQ 02L Unit Iron 7439-89-6 T - 300 IL - - 266 J+ 2210 J Manganese 7439-96-5 D - - IL - - 249 J 1100 J Manganese 7439-96-5 T - - 50 IL - - 417 J - 1220 J As III 7784-46-5 T - - - IL 0.2 U 0.2 U 0.5 U 0.24 0.325 J+ As V 10103-60-3 T - - IL 0.2 U 0.2 U 0.5 U 0.2 U 0.5 U Chromium VI 18540-29-9 T - - 0.07 IL 0.041 0.056 0.14 0.05 UJ 0.0093 J Fe II 1345-25-1 T - - - IL 23 J 7 J 30 UJ 213 25.5 J+ Fe III 1309-37-1 T - - - /L 74.9 J 103 J - 253 - Mn II 1344-43-0 T - - IL 62.9 71.1 - 2470 - Mn IV 1313-13-9 T - - - /L 62.1 J 49.5 J - 0.74 - Se IV 10102-18-8 T - - - - IL 0.5 U 0.5 U 2 U 0.5 U 2 U Se VI 13410-01-0 T - - - IL 0.5 U 0.5 U 2 U 0.5 U 2 U Dissolved Oxygen DO N - - m 1L - 4.65 7A 3.89 5.12 Temperature TEMP N - - - - Deg C - 29.7 18.5 23 18.6 H PH N 6 1 9 6.5 8.5 SU - 8.05 7.5 7.2 7.4 Turbidity, field TURB N - - - - NTU - 5A7 130.2 4.21 115.E Specific Conductivity field Sc N - - S/= - 170.3 269.9 287 257.1 Oxidation Reduction Potential ORP N - - _ - mV - 200.3 101.5 102.3 -92.8 Notes: pg/L = micrograms per liter pSlcm = microsiemens per centimeter It = feet mV = millivolts NTU - nephelometric turbidity units pCi1L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 2 of 2