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Home My WebLink AboutNC0004961_3_FINAL_CSA Supplement 2_Riverbend_Tables_20160826Table 1-1: Well Construction Information Monitoring ML� Well ID AB-1D Monitoring Well .•Program Deep Northing 595031.01 Easting 1415498.78 TOC 719.31 Casing -0.17 Casing Type PVC Casing 5.00 Top of 193.00 Bottom of 198.00 Total 209.81 CAMA AB-1S Shallow 595024.03 1415502.37 719.30 -0.25 PVC 2.00 29.00 44.00 69.68 CAMA AB-21) Deep 594588.42 1415674.97 719.33 -0.22 PVC 5.00 151.00 156.00 209.00 CAMA AB-2S Shallow 594597.30 1415671.78 719.28 -0.20 PVC 2.00 50.00 65.00 75.04 CAMA AB-3BR Bedrock 593978.52 1415271.06 727.81 -0.57 PVC 5.00 206.00 211.00 224.03 CAMA AB-3D Deep 593974.72 1415275.76 727.72 -0.59 PVC 5.00 173.00 178.00 187.07 CAMA AB-3S Shallow 593982.21 1415267.15 727.78 -0.57 PVC 2.00 13.00 28.00 72.48 CAMA AB-41) Deep 594396.84 1414855.06 728.33 -0.43 PVC 5.00 198.50 203.50 209.17 CAMA AB-4S Shallow 594393.61 1414857.36 728.27 -0.50 PVC 2.00 15.00 30.00 54.58 CAMA AB-51) Deep 593709.76 1414280.28 724.46 3.12 PVC 5.00 154.00 159.00 172.13 CAMA AB-5S Shallow 593710.52 1414274.00 724.48 3.12 PVC 2.00 9.00 24.00 29.11 CAMA AB-5SL Shallow 593711.25 1414269.23 724.49 3.06 PVC 2.00 47.00 57.00 71.05 CAMA AB-6BRU Deep 593724.39 1414127.53 728.51 -0.30 PVC 5.00 169.00 174.00 179.76 CAMA A13-6S Shallow 593718.42 1414129.08 728.43 -0.30 PVC 2.00 50.00 65.00 74.61 CAMA AB-71) Deep 593068.72 1415045.66 729.68 2.84 PVC 5.00 142.00 147.00 211.68 CAMA AB-71 Intermediate 593054.50 1415046.03 729.47 2.84 PVC 2.00 70.00 85.00 95.97 CAMA AB-7S Shallow 593047.86 1415046.86 729.37 2.53 PVC 2.00 5.00 20.00 34.37 CAMA AB-8D Deep 593295.44 1413887.20 682.46 3.21 PVC 5.00 91.00 96.00 105.76 CAMA AB-8S Shallow 593298.53 1413876.27 681.65 2.87 PVC 2.00 13.00 28.00 42.25 CAMA AS-11) Deep 592498.83 1413188.18 766.93 2.97 PVC 6.00 171.00 176.00 185.96 CAMA AS-1S Shallow 592513.58 1413205.28 767.44 2.96 PVC 2.00 81.00 96.00 102.44 CAMA AS-21) Deep 592600.94 1413757.51 776.96 2.97 PVC 4.00 185.00 190.00 214.77 CAMA AS-2S Shallow 592617.99 1413760.43 776.85 2.67 PVC 2.00 74.00 89.00 94.67 CAMA AS-31) Deep 592656.95 1414310.71 778.58 2.69 PVC 5.00 139.00 144.00 150.88 CAMA AS-3S Shallow 592637.18 1414312.33 778.52 2.83 PVC 2.00 58.80 73.80 92.52 CAMA BG-1D Deep 592581.76 1417064.23 704.46 3.34 PVC 6.00 194.20 199.20 207.18 CAMA BG-1S Shallow 592578.54 1417067.68 704.22 3.02 PVC 2.00 29.70 44.70 47.94 CAMA BG-2BR Bedrock 593271.86 1417250.78 705.73 3.02 PVC 6.00 203.00 208.00 216.57 CAMA BG-2D Deep 593280.76 1417250.70 705.36 3.02 PVC 6.00 155.00 160.00 172.78 CAMA BG-2S Shallow 593277.86 1417257.99 705.48 2.98 PVC 2.00 49.00 65.00 73.11 CAMA BG-3D Deep 593880.16 1417257.63 674.68 2.10 PVC 6.00 100.00 105.00 113.75 CAMA BG-3S Shallow 593887.13 1417259.35 673.89 1.76 PVC 2.00 22.00 37.00 39.17 CAMA BG-4BR Bedrock 591537.38 1412432.40 708.91 2.79 PVC 5.00 167.79 172.79 173.79 CAMA BG-4D Deep 591529.93 1412441.20 708.33 2.74 PVC 6.00 130.74 140.74 141.74 CAMA BG-4S Shallow 591526.41 1412435.17 707.97 2.62 PVC 2.00 52.62 67.62 72.62 CAMA BG-5BR Bedrock 591030.31 1410108.20 719.24 2.74 PVC 6.00 130.74 135.74 138.74 CAMA BG-5D C-1BRU CAS Deep Deep Shallow 591026.49 593097.48 593084.92 1410117.07 1412815.04 1412807.55 719.23 662.23 663.00 2.78 2.98 2.88 PVC PVC PVC 6.00 5.00 2.00 100.78 115.00 5.00 105.78 120.00 15.00 106.78 129.98 19.88 CAMA CAMA CAMA Riverbend Steam Station Page 1 of 4 CSA Supplement 2 Table 1-1: Well Construction Information Monitoring Well ID C-21) Monitoring Well .•Program Deep Northing 592974.08 Easting 1413151.06 TOC 684.53 Casing 2.92 Casing Type PVC Casing 5.00 Top of 133.00 Bottom of 138.00 Total 155.01 CAMA C-2S GWA-10BRU GWA-105 GWA-11D Shallow Deep Shallow Deep 592968.44 595755.16 595743.15 593109.77 1413170.22 1415038.67 1415047.47 1412075.98 684.29 657.57 658.71 672.81 3.00 3.06 3.13 3.09 PVC PVC PVC PVC 2.00 5.00 2.00 5.00 18.00 133.50 7.50 112.09 33.00 138.50 22.50 117.09 40.04 149.76 26.44 118.09 CAMA CAMA CAMA CAMA GWA-115 Shallow 593105.90 1412087.83 671.27 3.07 PVC 2.00 19.07 34.07 35.07 CAMA GWA-12D Deep 592652.05 1412394.90 685.97 3.60 PVC 6.00 133.60 138.60 141.60 CAMA GWA-125 Shallow 592662.96 1412395.12 685.15 3.14 PVC 2.00 18.15 33.15 35.15 CAMA GWA-13D Deep 591995.47 1413562.74 744.78 -0.34 PVC 10.00 276.66 281.66 286.66 CAMA GWA-135 Shallow 591995.71 1413550.82 744.40 -0.37 PVC 2.00 44.44 59.44 61.64 CAMA GWA-14D Deep 592533.89 1415604.13 779.25 2.75 PVC 6.00 205.75 210.75 213.75 CAMA GWA-145 Shallow 592530.37 1415598.10 779.50 3.22 PVC 2.00 3.22 3.22 3.22 CAMA GWA-1BRU Deep 595502.82 1414366.63 696.47 3.10 PVC 5.00 72.00 77.00 84.62 CAMA GWA-1S Shallow 595510.09 1414374.78 696.23 3.24 PVC 2.00 28.00 43.00 52.01 CAMA GWA-20BR Bedrock 592206.05 1413554.51 738.35 -0.41 PVC 6.00 300.60 305.60 311.15 CAMA GWA-20D Deep 592208.39 1413533.63 737.25 -0.36 PVC 6.00 253.00 258.00 258.46 CAMA GWA-205 Shallow 592204.02 1413568.43 739.05 -0.47 PVC 2.00 37.00 53.00 56.67 CAMA GWA-21BR Bedrock 592044.72 1413988.30 NM NM PVC 6.00 NM NM NM CAMA GWA-21D Deep 592047.54 1413985.97 NM NM PVC 6.00 NM NM NM CAMA GWA-215 Shallow 592039.09 1413993.11 NM NM PVC 2.00 NM NM NM CAMA GWA-22BR-A Bedrock 592257.01 1414026.69 763.78 3.07 PVC 5.00 269.00 274.00 304.43 CAMA GWA-22D Deep 592257.68 1414008.73 761.94 3.24 PVC 5.00 198.00 203.00 216.62 CAMA GWA-22S GWA-23BR GWA-23D GWA-235 Shallow Bedrock Deep Shallow 592255.58 592269.35 592272.79 592276.82 1414015.36 1413842.87 1413841.08 1413840.94 762.51 746.23 745.94 745.91 3.05 2.65 2.74 2.47 PVC PVC PVC PVC 2.00 5.00 5.00 2.00 40.00 285.00 221.00 33.00 55.00 290.00 226.00 48.00 61.47 305.50 229.87 52.56 CAMA CAMA CAMA CAMA GWA-2BR GWA-2BRU GWA-2S Bedrock Deep Shallow 594397.34 594398.42 594388.30 1413837.03 1413840.85 1413839.31 689.82 689.85 689.88 3.25 3.06 3.32 PVC PVC PVC 5.00 5.00 2.00 115.00 77.00 35.00 120.00 82.00 50.00 128.25 94.06 56.32 CAMA CAMA CAMA GWA-31) GWA-3S GWA-3SA GWA-4BR Deep Shallow Shallow Bedrock 593358.78 593361.15 593367.94 592223.54 1412338.93 1412342.59 1412339.14 1412747.74 677.08 677.08 677.05 695.89 3.12 2.95 2.71 2.96 PVC PVC PVC PVC 5.00 2.00 2.00 4.00 42.00 18.00 23.00 159.00 47.00 28.00 39.00 164.00 58.12 12.99 42.21 177.39 CAMA CAMA CAMA CAMA GWA-41) Deep 592203.26 1412745.43 696.56 2.88 PVC 6.00 120.00 125.00 129.14 CAMA GWA-4S Shallow 592212.40 1412746.66 696.35 2.95 PVC 2.00 17.00 32.00 39.26 CAMA GWA-51) GWA-5S GWA-61) GWA-6S Deep Shallow Deep Shallow 592403.01 592405.64 592758.69 592760.54 1414883.71 1414889.82 1415367.04 1415388.34 787.63 787.95 770.06 770.49 3.19 3.10 3.03 2.87 PVC PVC PVC PVC 5.00 2.00 5.00 2.00 212.00 60.00 143.00 45.00 217.00 75.00 148.00 60.00 240.19 79.10 194.06 63.86 CAMA CAMA CAMA CAMA Riverbend Steam Station Page 2 of 4 CSA Supplement 2 Table 1-1: Well Construction Information Monitoring ML� Well ID GWA-7BR Monitoring Well .•Program Bedrock Northing 593517.35 Easting 1416298.25 TOC 688.23 Casing 3.25 Casing Type PVC Casing 5.00 Top of 127.00 Bottom of 132.00 Total 177.16 CAMA GWA-71) Deep 593504.07 1416299.01 689.15 3.26 PVC 5.00 100.00 105.00 132.76 CAMA GWA-7S Shallow 593505.40 1416293.49 689.24 3.17 PVC 2.00 5.00 20.00 26.17 CAMA GWA-81) Deep 594143.08 1416106.78 689.00 3.35 PVC 5.00 111.00 116.00 124.91 CAMA GWA-8S Shallow 594140.01 1416104.71 689.24 3.23 PVC 2.00 8.00 23.00 27.42 CAMA GWA-9BR Bedrock 594614.17 1415968.76 654.26 2.77 PVC 6.00 106.00 111.00 122.93 CAMA GWA-91) Deep 594609.76 1415973.14 654.69 2.61 PVC 5.00 62.00 67.00 74.90 CAMA GWA-9S Shallow 594615.65 1415972.82 654.46 2.82 PVC 2.00 5.00 15.00 19.90 CAMA MW-15BR Bedrock 595981.89 1414695.44 656.53 3.28 PVC 6.00 56.00 61.00 65.28 CAMA MW-15D Deep 595973.56 1414693.63 656.69 3.30 PVC 5.00 39.00 44.00 57.30 CAMA MW-2S-A Shallow 595023.05 1414538.13 717.82 3.65 PVC 2.00 44.65 59.65 63.65 CAMA MW-71311 Bedrock 592797.39 1415855.55 765.80 3.14 PVC 5.00 196.00 201.00 243.31 CAMA MW-9BR Bedrock 593477.49 1413278.00 651.64 2.89 PVC 6.00 147.00 152.00 199.20 CAMA MW-9D Deep 593490.30 1413265.90 651.48 2.98 PVC 6.00 101.00 106.00 125.99 CAMA OB-1 Observation 593163.30 1415785.47 749.02 3.00 PVC 2.00 33.00 48.00 53.00 CAMA OB-2 Observation 593141.87 1416301.36 723.10 2.99 PVC 2.00 39.00 54.00 58.99 CAMA MW-10 MW-11DR MW-11SR MW-13 Shallow Deep Shallow Shallow 594277.40 595196.80 595195.80 595355.00 1413609.00 1414126.00 1414130.00 1415763.00 654.37 693.18 693.30 654.11 2.37 2.62 2.80 2.30 PVC PVC PVC PVC 2.00 2.00 2.00 2.00 8.37 40.60 21.23 7.45 23.37 45.60 36.23 22.45 23.37 45.60 36.23 22.45 NPDES NPDES NPDES NPDES MW-14 MW-15 Shallow Shallow 594338.80 595979.60 1416364.00 1414680.00 662.84 657.12 1.89 3.24 PVC PVC 2.00 2.00 7.56 9.82 22.56 24.82 22.56 24.82 NPDES NPDES MW-75R MW-8D Shallow Deep 592785.20 592170.30 1415850.00 1413844.00 765.95 756.03 3.01 2.08 PVC PVC 2.00 2.00 49.93 160.97 69.93 170.97 69.93 170.97 NPDES NPDES MW-81 MW-8S MW-9 MW-1D Shallow Shallow Shallow Deep 592179.30 592177.70 593485.50 593747.60 1413850.00 1413863.00 1413277.00 1413818.00 754.74 755.40 651.84 653.26 2.25 2.46 2.91 2.69 PVC PVC PVC PVC 2.00 2.00 2.00 2.00 102.38 39.95 18.77 61.99 122.38 59.95 33.77 66.99 122.38 59.95 33.77 66.99 NPDES NPDES NPDES Voluntary MW-1S Shallow 593746.70 1413827.00 653.81 2.64 PVC 2.00 10.30 20.30 20.30 Voluntary MW-2D Deep 595036.60 1414516.00 715.21 2.71 PVC 2.00 89.06 94.06 94.06 Voluntary MW-25 Shallow 595037.80 1414508.00 714.49 2.16 PVC 2.00 19.81 29.81 29.81 Voluntary MW-3D Deep 595649.20 1414954.00 654.96 2.47 PVC 2.00 33.97 38.97 38.97 Voluntary MW-35 Shallow 595657.00 1414954.00 655.47 2.57 PVC 2.00 8.85 18.85 18.85 Voluntary MW-4D Deep 595495.40 1415469.00 668.38 2.53 PVC 2.00 60.11 65.11 65.11 Voluntary MW-45 Shallow 595497.80 1415477.00 667.72 2.34 PVC 2.00 13.50 23.94 23.94 Voluntary MW-5D Deep 595066.80 1415817.00 649.89 2.69 PVC 2.00 79.59 84.59 84.59 Voluntary MW-55 Shallow 595068.40 1415825.00 649.41 2.51 PVC 2.00 10.18 20.18 20.18 Voluntary MW-6D MW-6S Deep Shallow 594666.40 594671.70 1415945.00 1415942.00 650.80 650.33 3.02 2.73 PVC PVC 2.00 2.00 75.34 10.37 80.34 20.37 80.34 20.37 Voluntary Voluntary Riverbend Steam Station Page 3 of 4 CSA Supplement 2 Table 1-1: Well Construction Information MW-7D M W-7S Deep _ 592779.10 1415850.00 765.15 Shallow 592781.00 1415852.00 765.43 Notes: 1. TOC indicates top of casing 2. TOC elevation based on NAVD 88 vertical datum 3. Northing and Easting based on NAD83 horizontal datum 4. ft indicates measurements in feet 5. btoc indicates measurements below the top of casing 6. NM indicates "not measured"; NR indicates no record 7. Deep and Bedrock CAMA wells installed with 2-inch riser; Casing value listed for D/BR CAMA wells indicates outer casing diameter. 2.18 PVC 2.00 2.21 PVC 2.00 99.86 47.29 104.86 52.29 104.86 Volunta 52.29 Volunta Page 4 of 4 Riverbend Steam Station CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: NS NS NS NS 6.5 - 8.5 500 10 250 Units: °C mV µQ/cm mg/L SU mg/L mg/L mg/L Well ID Sample Date Temperature ORP Specific Conductivity D• pH (Field) TDS Nitrate Chloride MW-IS 12/16/2008 18.3 -- 172 - 6.88 92 0.03 8.3 MW-1S 6/22/2009 17.47 167 - 6.53 156 0.02 11 MW-IS 12/14/2009 18.14 - 173 - 6.99 <100 <0.02 9.6 MW-1S 6/28/2010 19.16 - 169 - 6.47 90 <0.2 8.7 MW-1D 12/16/2008 17.81 - 269 - 6.16 224 0.03 6.7 MW-1D 6/22/2009 19.51 275 5.93 302 <0.02 7.2 MW-1D 12/14/2009 17.46 -- 286 6.16 194 <0.02 6.8 MW-1D 6/28/2010 19.98 - 279 5.89 218 <0.2 7.4 MW-2S 12/16/2008 20.87 - 152.3 4.59 98 0.16 8 MW-2S 6/22/2009 18.01 142 4.44 216 0.09 6.2 MW-2S 12/14/2009 19.25 - 168 4.45 64 0.07 9.3 MW-2S 6/28/2010 17.71 149 4.36 91 <0.2 5.7 MW-21) 12/16/2008 17.3 - 73 - 6.46 96 0.05 2.8 MW-21) 6/22/2009 18.21 90 - 6.48 130 <0.02 4.2 MW-21) 12/14/2009 16.55 - 123 - 6.53 64 <0.02 3.6 MW-21) 6/28/2010 18.91 95 6.42 101 <0.2 5.9 MW-3S 12/16/2008 15.03 - 189.3 6.49 128 0.04 7.6 MW-3S 6/22/2009 15.13 196.6 6.31 144 <0.02 6.1 MW-3S 12/14/2009 14.64 - 195.4 6.24 132 <0.02 6.5 MW-3S 6/28/2010 17.51 - 191.3 6.26 143 <0.2 4.5 MW-31) 12/16/2008 14.07 - 179.5 - 6.98 154 0.08 5.5 MW-31) 6/22/2009 14.6 185.3 - 6.73 156 0.06 5.9 MW-31) 12/14/2009 13.78 - 184.6 - 6.79 140 0.06 5.7 MW-31) 6/28/2010 15.79 - 186.5 - 6.84 149 <0.2 6.5 MW-4S 12/16/2008 14.61 -- 116.3 5.49 124 0.11 6.3 MW-4S 6/22/2009 14.43 - 111.8 5.38 106 0.16 8 MW-4S 12/14/2009 13.74 -- 112.3 5.35 118 0.15 5.7 MW-4S 6/28/2010 17.49 -- 113.6 -- 5.51 100 <0.2 5.6 MW-4S 2/5/2013 11.13 365 160 7.86 5.35 1100 0.08 7.6 MW-4S 10/15/2013 14.99 372 120 0.04 5.43 81 0.1 6.6 MW-4S 2/4/2014 12.59 371 116 0.2 5.44 100 0.13 6.7 MW-4S 6/3/2014 14.84 412 115 1.85 5.33 -- -- -- MW-45 10/7/2014 15.24 200 128 1.88 5.46 120 0.08 6.4 MW-4S 2/3/2015 12.44 338 122 1.18 5.22 110 0.13 6.5 MW-45 6/1/2015 17.01 365 118 0.86 5.44 78 0.12 6.6 MW-4S 10/8/2015 15.43 359 156 4.2 5.47 -- -- -- MW-4S 2/2/2016 13.77 383 168 0 4.8 210 <0.023 8.9 MW-4S 6/6/2016 22.83 307 130 4.05 5.4 -- -- -- MW-41) 12/16/2008 13.98 -- 133.1 -- 5.92 134 0.06 5.9 MW-41) 6/22/2009 14.45 - 138.4 - 5.86 112 0.06 7.1 MW-41) 12/14/2009 13.39 -- 135.6 - 5.79 116 0.03 6 MW-41) 6/28/2010 15.48 -- 136.1 -- 5.86 127 <0.2 6.3 MW-41) 2/5/2013 13.01 347 131 0.11 5.62 130 0.04 5.7 MW-41) 10/15/2013 13.99 379 136 12.54 5.97 120 0.04 6 MW-41) 2/4/2014 13.57 479 135 1.72 5.74 120 0.04 6 MW-41) 6/3/2014 14.1 399 135 1.31 5.57 -- -- -- MW-41) 10/7/2014 14.02 207 135 0.15 5.72 130 0.03 5.8 MW-41) 2/3/2015 13.43 328 135 0.15 5.56 110 0.03 5.9 MW-41) 6/1/2015 14.38 347 132 0.18 5.67 110 0.03 5.8 MW-41) 10/8/2015 14.65 346 132 0.22 5.67 100 0.03 6 MW-41) 2/2/2016 13.68 252 134 0 5.49 110 0.03 2 MW-41) 6/6/2016 15.14 290 134 0.08 5.83 -- -- -- MW-5S 12/16/2008 15.71 -- 56 -- 5.4 74 0.08 9.5 MW-5S 6/22/2009 16.73 - 64.1 - 5.37 52 1.14 9.4 MW-5S 12/14/2009 15.36 -- 62.5 - 5.15 62 0.13 9 MW-5S 6/28/2010 18.52 - 64.3 - 5.27 48 <0.2 8.1 Riverbend Steam Station Page 1 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: NS NS NS NS 6.5 - 8.5 500 10 250 Units: °C mV µQ/cm mg/L SU mg/L mg/L mg/L Well ID Sample Date Temperature ORP Specific Conductivity D• pH (Field) TDS Nitrate Chloride MW-5S 12/6/2010 - - - - - MW-5S 2/1/2011 - MW-5S 6/7/2011 - - - - MW-5S 10/4/2011 -- -- -- -- -- -- - MW-5S 2/4/2013 12.58 384 72 0.6 5.06 65 0.04 8.1 MW-5S 10/15/2013 18.32 383 76 0.97 5.12 80 0.03 8.6 MW-5S 2/4/2014 11.98 330 75 0.4 5.03 81 0.05 8.3 MW-5S 6/3/2014 15.68 378 78 0.07 4.84 -- -- -- MW-55 10/7/2014 17.93 386 74 0.14 4.84 76 <0.023 7.8 MW-5S 2/3/2015 12.62 402 75 0.29 4.59 59 0.03 7.9 MW-55 6/2/2015 15.87 390 75 2.05 4.93 67 0.03 7.5 MW-5S 10/8/2015 17.75 433 60 6.47 4.91 50 0.05 7.5 MW-5S 2/2/2016 13.99 399 66 0.49 4.94 40 0.03 2.8 MW-5S 6/6/2016 16.16 278 51 0 5.02 -- -- -- MW-5D 12/16/2008 15.32 -- 278.1 -- 6.83 224 0.15 7.7 MW-51) 6/22/2009 16.19 - 281 - 6.81 186 0.16 7.9 MW-51) 12/14/2009 14.94 - 277.8 - 6.7 196 0.14 7.8 MW-51) 6/28/2010 16.87 -- 279.6 -- 6.78 200 <0.2 8.1 MW-SD 2/4/2013 13.95 323 265 3.82 6.65 210 0.15 7.2 MW-51) 10/15/2013 16.69 177 267 15.28 6.75 220 0.12 7.4 MW-SD 2/4/2014 14.3 229 241 14.08 6.79 220 0.13 7.4 MW-51) 6/3/2014 15.82 242 263 0.4 6.49 -- -- -- MW-5D 10/7/2014 15.93 320 265 1.69 6.52 220 0.14 7 MW-51) 2/3/2015 14.16 318 265 1.31 6.52 200 0.13 7.1 MW-SD 6/2/2015 15.81 214 265 0.41 6.59 200 0.1 6.6 MW-51) 10/8/2015 16.07 316 264 0.27 6.59 200 0.14 7.2 MW-SD 2/2/2016 15.31 298 263 0.3 6.59 180 0.13 2.6 MW-51) 6/6/2016 16.59 211 258 0 6.57 -- -- -- MW-6S 12/16/2008 15.67 -- 141.7 -- 6.31 114 0.03 5.3 MW-6S 6/22/2009 16.88 149.8 - 6.38 108 <0.23 5.4 MW-6S 12/14/2009 15.78 - 149.7 - 6.28 116 <0.02 5.3 MW-6S 6/28/2010 17.26 151.7 - 6.39 107 <0.2 6.4 MW-6S 12/6/2010 -- - -- - -- -- - MW-6S 2/1/2011 - - MW-6S 6/7/2011 - - - MW-6S 10/4/2011 -- -- - -- -- - MW-6D 12/16/2008 15.63 - 162.7 - 6.48 126 0.03 5.8 MW-61) 6/22/2009 16.97 - 170.7 - 6.58 134 <0.02 6 MW-61) 12/14/2009 15.45 -- 169.7 - 6.45 130 <0.02 6.1 MW-61) 6/28/2010 17.54 170.1 - 6.7 113 <0.2 6.8 MW-7SR 12/6/2010 13.21 - 29 - 5.48 120 <0.1 2 MW-7SR 2/2/2011 15.36 23.4 - 5.33 <50 <0.1 2 MW-7SR 6/6/2011 16.69 - 24 - 5.34 22 <0.023 2 MW-7SR 10/4/2011 15.31 -- 28 -- 5.37 <10 <0.023 1.9 MW-7SR 2/22/2012 15.32 374 21 6.69 5.13 24 <0.1 2.1 MW-7SR 6/5/2012 16.01 349 22 3.86 5.19 32 <0.023 1.9 MW-7SR 10/3/2012 16.78 382 22 5.8 5.24 10 <0.023 1.8 MW-7SR 2/4/2013 15.17 368 20 5.69 5.12 15 0.02 1.8 MW-7SR 6/3/2013 16.24 366 20 5.86 4.96 <25 <0.023 1.9 MW-7SR 10/14/2013 16.52 348 22 6.81 5.29 <25 <0.023 1.9 MW-75R 2/5/2014 14.55 403 19 7.1 5.06 <25 0.02 2 MW-7SR 6/2/2014 17.38 415 20 6.87 5.05 <25 <0.023 1.9 MW-7SR 10/6/2014 15.92 384 20 6.4 5.1 <25 <0.023 2 MW-7SR 2/2/2015 15.62 383 20 6.04 5.05 <25 <0.023 2 MW-75R 6/1/2015 16.15 418 19 5.99 5.03 <25 <0.023 2 MW-7SR 10/7/2015 16.96 421 19 6.54 5.24 <25 0.03 1.9 Riverbend Steam Station Page 2 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: NS NS NS NS 6.5 - 8.5 500 10 250 Units: °C mV µQ/cm mg/L SU mg/L mg/L mg/L Well r Sample Date Temperature •.. Specific Conductivity r• pH (Field) TDS Nitrate Chloride MW-75R 2/1/2016 15.46 420 20 6.61 5.19 <25 0.05 1.2 MW-7SR 6/6/2016 16.69 363 19 6.02 5.23 -- -- -- MW-71) 12/16/2008 15.6 -- 38.3 -- 5.92 44 0.04 1.1 MW-71) 6/22/2009 16.83 40 - 5.78 54 <0.02 1.2 MW-71) 12/14/2009 15.01 -- 35 - 5.85 46 <0.02 1.3 MW-71) 6/28/2010 17.27 - 39 - 5.64 63 <0.2 1.5 MW-71) 12/6/2010 13.31 -- 37 - 5.79 <50 <0.1 1.2 MW-71) 2/2/2011 15.7 - 32.9 - 5.61 <50 <0.1 1.2 MW-71) 6/6/2011 17.15 -- 33 - 5.79 45 <0.023 1.2 MW-71) 10/4/2011 15.45 -- 38 -- 5.8 27 <0.023 1 MW-71) 2/22/2012 15.47 403 36 8.31 5.56 47 <0.1 <1 MW-71) 6/5/2012 15.88 359 36 3.73 5.68 40 <0.023 1.2 MW-71) 10/3/2012 16.47 369 37 8.31 5.68 30 <0.023 1.2 MW-71) 2/4/2013 15.57 395 37 8.16 5.51 39 <0.023 1.1 MW-71) 6/3/2013 15.93 372 37 7.92 5.5 32 <0.023 1.2 MW-71) 10/14/2013 15.92 371 37 7.88 5.69 42 <0.023 1.1 MW-71) 2/5/2014 15.43 401 37 8.09 5.62 42 <0.023 1.3 MW-71) 6/2/2014 15.82 394 37 8.03 5.48 41 <0.023 1.2 MW-71) 10/6/2014 15.76 369 38 8.05 5.61 34 <0.023 1.2 MW-71) 2/2/2015 15.64 374 37 7.97 5.56 29 <0.023 1.2 MW-71) 6/1/2015 15.82 426 35 8.14 5.47 47 <0.023 1.3 MW-71) 10/7/2015 15.96 409 35 7.82 5.71 25 <0.023 1.1 MW-71) 2/1/2016 15.71 450 28 7.83 5.76 49 <0.023 0.52 MW-71) 6/6/2016 15.88 373 36 8.07 5.72 -- -- -- MW-85 12/6/2010 11.8 -- 19 -- 5.33 <50 <0.1 2 MW-8S 2/1/2011 13.54 - 19 - 5.22 <50 <0.1 2.2 MW-85 6/7/2011 16.86 - 17 - 4.94 20 <0.023 2.7 MW-8S 10/3/2011 14.42 -- 18 -- 5.22 18 <0.023 2.1 MW-85 2/6/2012 12.74 443 18 8.23 5.08 22 <0.02 2.2 MW-8S 6/4/2012 16.14 409 20 8.17 5.07 <25 <0.023 3 MW-85 10/3/2012 17.2 470 16 7.76 5.01 11 <0.023 2.2 MW-8S 2/4/2013 14.52 444 15 8.21 4.92 12 <0.023 2 MW-85 6/3/2013 16.21 463 19 7.84 4.34 <25 <0.023 2.7 MW-8S 10/14/2013 15.92 452 19 7.6 4.71 <25 <0.023 3 MW-8S 2/4/2014 14.71 473 17 8.15 4.8 <25 <0.023 2.5 MW-8S 6/2/2014 16.32 442 20 7.55 4.78 <25 <0.023 3.3 MW-8S 10/6/2014 16.2 391 21 7.4 4.83 <25 <0.023 3.5 MW-8S 2/2/2015 15.36 405 19 7.75 4.82 <25 <0.023 2.9 MW-8S 6/1/2015 16.07 485 18 8.06 4.75 <25 <0.023 2.9 MW-8S 10/7/2015 15.74 467 15 8.1 4.86 <25 <0.023 2.3 MW-8S 2/1/2016 15.27 506 18 7.7 4.87 37 <0.023 1.4 MW-8S 6/6/2016 16.68 389 22 7.22 4.81 -- -- -- MW-81 12/6/2010 13.47 -- 87 -- 6.82 110 <0.1 1.4 M W-81 2/1/2011 14.27 - 74 - 6.4 100 <0.1 1.2 MW-81 6/7/2011 17.44 - 61 - 6.33 92 <0.023 1.2 MW-81 10/3/2011 15.56 -- 57 -- 6.4 100 <0.023 1.1 MW-81 2/6/2012 14.51 350 54 9.14 6.4 100 <0.02 1.1 M W-81 6/4/2012 16.47 333 52 9.37 6.38 95 <0.023 1.2 MW-81 10/3/2012 16.82 440 49 8.57 6.09 87 <0.023 1.1 MW-81 2/4/2013 14.83 384 48 9.88 6.05 91 <0.023 1.1 MW-81 6/3/2013 16.74 401 47 9.44 5.65 78 <0.023 1.1 MW-81 10/14/2013 16.36 387 47 9.92 6 79 <0.023 1.1 MW-81 2/4/2014 12.88 399 47 10.45 6.03 87 <0.023 1.2 MW-81 6/2/2014 17.77 385 46 9.97 5.98 88 <0.023 1.1 MW-81 10/6/2014 15.84 341 48 10.42 6.02 91 <0.023 1.2 MW-81 2/2/2015 14.69 354 47 10.24 6.01 99 <0.023 1.2 Riverbend Steam Station Page 3 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: NS NS NS NS 6.5 - 8.5 500 10 250 Units: °C mV µQ/cm mg/L SU mg/L mg/L mg/L Well ID Sample Date Temperature ORP Specific Conductivity D• pH (Field) TDS Nitrate Chloride MW-81 6/1/2015 16.1 431 35 10.77 5.97 92 <0.023 1.2 MW-81 10/7/2015 15.81 409 46 10.3 6.12 84 <0.023 1.1 MW-81 2/1/2016 15.3 443 45 10.27 6.14 75 <0.023 0.38 M W-81 6/6/2016 16.04 386 45 10.67 6.04 -- -- -- MW-81) 12/6/2010 13.47 -- 90 -- 7.08 140 <0.1 2.5 MW-81) 2/1/2011 14.27 - 90 - 6.84 130 <0.1 2 MW-81) 6/7/2011 17.97 -- 95 - 7 120 <0.023 1.3 MW-81) 10/3/2011 15.38 -- 88 -- 6.8 110 0.02 1.2 MW-81) 2/6/2012 13.93 241 82 5.7 6.77 120 <0.02 1.2 MW-81) 6/4/2012 16.22 262 79 6.71 6.81 122 0.02 1.3 MW-81) 10/3/2012 17.75 365 76 7.85 6.49 130 0.03 1.2 MW-81) 2/4/2013 14.12 171 82 3.98 6.41 150 0.05 1.3 MW-81) 6/3/2013 16.54 167 81 4.14 6.27 120 0.04 1.3 MW-81) 10/14/2013 16.24 286 75 4.78 6.31 120 0.04 1.2 MW-81) 2/4/2014 13.38 345 75 6.62 6.38 140 0.04 1.3 MW-81) 6/2/2014 16.86 366 71 7.15 6.34 140 0.03 1.2 MW-81) 10/6/2014 15.73 343 74 8.08 6.34 110 0.03 1.3 MW-81) 2/2/2015 15.39 346 73 8.54 6.34 110 0.03 1.3 MW-81) 6/1/2015 15.93 421 72 7.63 6.34 120 <0.023 1.3 MW-81) 10/7/2015 15.85 382 69 8.11 6.41 89 0.04 1.2 MW-81) 2/1/2016 15.27 422 69 7.7 6.43 75 0.03 0.32 MW-81) 6/6/2016 16.31 379 68 8.63 6.43 -- -- -- MW-9 12/6/2010 14.51 -- 134.1 -- 6.14 200 0.43 2.3 MW-9 2/1/2011 14.67 - 133 - 6.13 140 0.1 2.2 MW-9 6/6/2011 17.1 - 133 - 6.4 140 0.1 2.3 M W-9 10/4/2011 15.68 -- 142 -- 6.23 120 0.09 2.1 MW-9 2/6/2012 14.65 368 148 2.88 6.29 150 0.08 2.3 MW-9 6/5/2012 16 332 152 3.8 6.03 127 0.08 2.4 MW-9 10/3/2012 17.01 296 157 3.21 6.1 140 0.08 2.2 MW-9 2/4/2013 14.3 382 162 3.69 5.99 170 0.08 2.4 MW-9 6/4/2013 15.66 386 170 2.77 5.82 150 0.08 2.5 MW-9 10/15/2013 15.86 303 167 2.76 6.01 140 0.1 2.5 MW-9 2/5/2014 15.67 356 169 2.73 5.98 150 0.09 2.6 MW-9 6/2/2014 15.57 414 167 2.77 6 150 0.08 2.5 MW-9 10/6/2014 15.65 249 157 2.99 5.97 130 0.08 2.5 MW-9 2/3/2015 15.44 336 153 3.38 6.02 120 0.08 2.4 MW-9 6/2/2015 15.66 331 143 4.73 6.05 140 0.09 2.3 MW-9 10/6/2015 15.82 281 144 3.18 6.1 110 0.07 2.2 MW-9 2/1/2016 15.65 256 139 3.25 6.08 92 0.06 0.81 MW-9 6/6/2016 15.85 308 134 3.96 6.21 -- -- -- MW-10 12/6/2010 15.2 -- 71.4 -- 5.57 78 0.2 7.2 MW-10 2/1/2011 14.1 - 84.7 - 5.4 90 <0.1 7 MW-10 6/7/2011 15.93 -- 79.4 - 5.3 74 0.04 6.9 MW-10 10/3/2011 16.81 -- 133.6 -- 5.36 85 0.03 6 MW-10 2/6/2012 14.67 408 65 1.52 5.3 62 0.04 7.6 MW-10 6/4/2012 15.53 401 68 1.01 5.26 61 0.04 6.5 MW-10 10/3/2012 17.87 243 124 0.88 5.41 97 <0.023 5.8 MW-10 2/4/2013 14.88 388 86 2.08 5.29 73 0.05 6.8 MW-10 6/4/2013 14.84 444 65 1.39 4.8 58 0.05 7.2 MW-10 10/15/2013 17.37 311 123 0.28 5.28 95 0.03 6.3 MW-10 2/3/2014 15.35 375 78 1.77 5.22 92 0.04 7.2 MW-10 6/2/2014 14.99 470 79 0.96 5.24 72 0.04 6.7 MW-10 10/6/2014 17.22 184 137 0.81 5.33 96 <0.023 6 MW-10 2/2/2015 14.04 339 99 2.89 5.22 69 0.04 7 MW-10 6/1/2015 15.57 284 89 0.84 5.36 76 <0.023 6.3 MW-10 10/6/2015 16.97 337 135 0.54 5.31 89 0.04 6.2 Riverbend Steam Station Page 4 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: NS NS NS NS 6.5 - 8.5 500 10 250 Units: °C mV µQ/cm mg/L SU mg/L mg/L mg/L Well r Sample Date Temperature •.. Specific Conductivity r• pH (Field) TDS Nitrate Chloride MW-10 2/1/2016 15.59 216 52 1.66 5.39 54 0.04 2.3 MW-10 6/6/2016 15.66 331 89 0.93 5.4 -- -- -- MW-11SR 2/1/2011 16.56 -- 167.7 -- 6.07 130 0.13 7.2 MW-11SR 6/6/2011 19.7 162.7 - 5.79 130 0.18 7.3 MW-11SR 10/3/2011 17.06 -- 161.8 -- 5.59 100 0.18 7 MW-11SR 2/6/2012 17.19 96 153 0.43 5.72 110 0.15 6.7 MW-11SR 6/4/2012 17.66 122 156 0.53 5.72 113 0.16 6.6 MW-11SR 10/3/2012 18.27 82 158 0.45 5.78 110 0.16 6.5 MW-11SR 2/4/2013 17.44 118 156 0.53 5.72 110 0.16 6.7 MW-11SR 6/3/2013 18.05 171 155 0.59 5.67 130 0.16 6.9 MW-11SR 10/14/2013 18.13 155 152 0.6 5.77 110 0.17 7.1 MW-11SR 2/3/2014 17.83 138 150 0.65 5.68 130 0.16 6.8 MW-11SR 6/2/2014 19.01 242 151 0.75 5.73 110 0.17 6.6 MW-11SR 10/6/2014 17.28 59 148 0.89 5.68 98 0.17 6.5 MW-11SR 2/2/2015 16.54 228 148 1.07 5.62 98 0.19 6.5 MW-11SR 6/1/2015 17.78 213 151 1.33 5.76 110 0.21 6.1 MW-11SR 10/6/2015 17.02 134 148 1.46 5.81 89 0.24 6.3 MW-11SR 2/1/2016 16.86 140 142 1.44 5.78 100 0.27 2.1 MW-11SR 6/6/2016 17.7 215 152 2.67 5.85 -- -- -- MW-11DR 2/1/2011 16.71 -- 153.9 -- 5.83 120 0.16 7.2 MW-11DR 6/6/2011 19.39 - 154.6 - 5.63 120 0.21 7.2 MW-11DR 10/3/2011 17.14 -- 155.4 -- 5.55 98 0.2 7 MW-11DR 2/6/2012 17.16 262 148 0.78 5.67 110 0.17 6.7 MW-11DR 6/4/2012 17.78 239 153 0.72 5.66 112 0.19 6.7 MW-11DR 10/3/2012 18.28 151 154 0.51 5.75 100 0.18 6.4 MW-11DR 2/4/2013 17.31 232 153 0.95 5.67 110 0.17 6.7 MW-11DR 6/3/2013 17.83 239 152 0.65 5.64 120 0.18 6.8 MW-11DR 10/14/2013 18.11 198 151 0.79 5.76 110 0.19 7 MW-11DR 2/3/2014 18.06 262 149 1.12 5.65 150 0.18 6.8 MW-11DR 6/2/2014 17.85 431 149 0.95 5.71 110 0.19 6.6 MW-11DR 10/6/2014 17.39 151 148 1.09 5.73 98 0.21 6.4 MW-11DR 2/2/2015 16.94 268 150 1.43 5.68 100 0.24 6.4 MW-11DR 6/1/2015 17.66 261 152 1.49 5.87 110 0.28 6 MW-11DR 10/6/2015 17.16 201 140 1.11 6 100 0.33 5.7 MW-11DR 2/1/2016 16.95 206 146 1.52 5.95 210 0.33 2.2 MW-11DR 6/6/2016 17.86 247 149 1.47 6 -- -- -- MW-13 12/6/2010 16.42 -- 198.2 -- 6.27 120 <0.1 4.6 MW-13 2/1/2011 14.75 - 296.9 - 6.35 110 <0.1 5 MW-13 6/7/2011 16.48 -- 203 - 6.22 120 <0.023 5 M W-13 10/4/2011 17.55 -- 213.6 -- 6.29 110 0.06 4.4 MW-13 2/6/2012 15.15 138 205 0.56 5.99 120 0.16 7.1 MW-13 6/5/2012 16.01 139 202 0.06 6.18 111 <0.023 4.5 MW-13 10/3/2012 18.46 100 218 0.59 6.28 110 <0.023 3.6 MW-13 2/5/2013 15.36 178 212 0.19 6.13 130 <0.023 5.1 MW-13 6/3/2013 15.83 234 185 0.11 5.97 110 <0.023 4.2 MW-13 10/15/2013 17.79 273 145 0.83 5.8 91 0.07 4.7 MW-13 2/3/2014 15.86 99 313 0.22 5.97 240 <0.023 11 MW-13 6/2/2014 14.65 153 215 0.2 6.17 130 <0.023 3.7 MW-13 10/6/2014 16.91 63 208 0.54 6.13 100 <0.023 3.6 MW-13 2/2/2015 15.07 157 266 1.01 5.86 180 <0.023 6.9 MW-13 6/1/2015 15.55 155 219 0.78 6.16 120 <0.023 4.3 MW-13 10/6/2015 17.48 147 204 0.35 6.32 110 <0.023 3.7 MW-13 2/1/2016 15.13 61 238 0 5.76 160 <0.023 7.6 MW-13 6/6/2016 16.17 141 205 0.54 6.26 -- -- -- M W-14 12/6/2010 15.13 -- 175.3 -- 6.86 140 0.35 6.6 MW-14 2/1/2011 14.23 - 194.1 - 6.95 140 <0.1 6.9 Riverbend Steam Station Page 5 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: NS NS NS NS 6.5 - 8.5 500 10 250 Units: °C mV 110/cm mg/L SU mg/L mg/L mg/L Well ID Sample Date Temperature ORP SpecificD•Chloride MW-14 6/7/2011 17.22 -- 215.8 - 6.79 180 0.06 8.2 MW-14 10/4/2011 17.18 -- 196.1 -- 6.8 120 0.09 7.6 MW-14 2/6/2012 15.12 225 203 0.98 6.81 150 0.06 9.5 MW-14 6/5/2012 15.69 262 199 0.42 6.71 148 0.07 9.6 MW-14 10/3/2012 17.94 209 197 0.52 6.73 150 0.08 7.3 MW-14 2/4/2013 15.34 230 214 1.85 6.79 150 0.07 9.2 MW-14 6/3/2013 16.07 310 205 0.52 6.85 140 <0.023 8.4 MW-14 10/15/2013 17.68 319 202 0.33 6.63 140 <0.023 8 MW-14 2/3/2014 14.64 349 214 0.79 6.74 180 <0.023 9.2 MW-14 6/2/2014 14.83 298 199 0.49 6.73 140 <0.023 7.9 MW-14 10/6/2014 17.03 298 199 0.36 6.64 130 <0.023 7.3 MW-14 2/2/2015 14.01 267 232 1.85 6.64 150 <0.023 11 MW-14 6/1/2015 15.6 264 208 0.66 6.76 160 <0.023 7.4 MW-14 10/6/2015 17.58 217 208 0.64 6.61 130 0.05 7.2 MW-14 2/1/2016 14.84 215 200 0 6.63 150 0.05 2.5 MW-14 6/6/2016 15.87 99 209 0.23 6.61 -- -- -- MW-15 2/23/2011 15.48 424 109.5 2.21 5.29 84 0.23 7.1 MW-15 6/6/2011 17.15 -- 106.7 -- 5.21 110 0.19 6.4 M W-15 10/3/2011 16.94 -- 106.2 -- 5.16 75 0.18 6.5 MW-15 2/6/2012 15.63 360 96 2.12 5.19 84 0.14 6.7 MW-15 6/5/2012 15.93 422 103 0.91 5.07 77 0.15 6.6 MW-15 10/3/2012 18.02 383 102 2.37 5.24 77 0.13 6.5 MW-15 2/4/2013 16.25 330 100 1.39 5.2 81 0.11 6.4 MW-15 6/3/2013 16.11 418 102 0.67 5.1 81 0.09 6.7 MW-15 10/14/2013 17.66 207 103 0.83 5.19 81 0.11 6.8 MW-15 2/3/2014 16.89 386 99 1.69 5.06 120 0.07 7.1 MW-15 6/2/2014 15.18 433 101 0.98 5.05 83 0.05 6.6 MW-15 10/6/2014 16.88 131 101 2.09 5.11 71 0.06 6.7 MW-15 2/2/2015 15.7 312 102 2.79 5.07 77 0.04 6.6 MW-15 6/1/2015 15.78 369 105 1.64 5.1 90 0.04 6 MW-15 10/6/2015 17.43 301 104 1.93 5.18 76 0.07 6.4 MW-15 2/1/2016 16.22 251 92 1.79 5.2 86 0.05 2.7 MW-15 6/6/2016 16.1 369 108 2.58 5.23 -- -- -- Notes: 1. °C indicates temperature measured in degrees celsius 2. mV indicates oxidation/reduction potential measured in millivolts 3. µ0/cm indicates specific conductivity measured in micromhos per centimeter 4. mg/L indicates concentrations measured in milligrams per liter 5. µg/L indicates concentrations measured in micrograms per liter 6. SU indicates pH values measured in standard units 7. NTU indicates turbidity values measured in Nephalometric Turbidity Units 8. Parameters are compared to standards found in 15A NCAC Subchapter 02L Classifications and Water Quality Standards Applicable to the Groundwaters of North Carolina 9. 2L Standards are established as part of 15A NCAC 02L .0202 10. Interim Maximum Allowable Concentrations (IMACs) can be found in Appendix #1 of 15A NCAC Subchapter 02L Classifications and Water Quality Standards Applicable to the Groundwaters of North Carolina Riverbend Steam Station Page 6 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 250 10 700 700 2 10 1 300 Well ID MW-IS Units: Sample Date 12/16/2008 mg/L Sulfate 1.1 µg/L Arsenic <2 µg/L Barium 25 µg/L Boron 176 µg/L Cadmium <0.5 µg/L Chromium <1 mg/L Copper <0.002 µg/L 33800 MW-1S 6/22/2009 2.1 <1 20 164 <1 <1 0.002 29100 MW-IS 12/14/2009 3 <1 22.3 228 <1 <1 <0.001 31200 MW-1S 6/28/2010 <1 <1 21 199 <1 <1 <0.001 30700 MW-11) 12/16/2008 95 <2 33 552 <0.5 <1 <0.002 88 MW-11) 6/22/2009 110 <1 31 509 <1 <1 <0.001 42 MW-11) 12/14/2009 95 <1 32.9 609 <1 <1 <0.001 28.2 MW-11) 6/28/2010 110 <1 31.7 604 <1 <1 <0.001 <10 MW-2S 12/16/2008 45 <2 69 387 <0.5 <1 0.004 21 MW-2S 6/22/2009 51 <1 51 254 <1 <1 0.003 26 MW-2S 12/14/2009 42 <1 64.1 332 <1 <1 0.004 16.4 MW-2S 6/28/2010 49 <1 57.3 254 <1 <1 0.004 14.3 MW-21) 12/16/2008 0.54 <2 29 <100 <0.5 1.71 <0.002 525 MW-21) 6/22/2009 0.33 <1 26 <100 <1 1.68 <0.001 262 MW-21) 12/14/2009 0.3 <1 25.7 <50 <1 1.5 0.002 376 MW-21) 6/28/2010 28 <1 22.8 <50 <1 1.4 <0.001 44.5 MW-3S 12/16/2008 33 <2 42 241 <0.5 <1 <0.002 3390 MW-3S 6/22/2009 37 <1 37 234 <1 <1 <0.001 3760 MW-3S 12/14/2009 31 <1 42.3 245 <1 <1 <0.001 5710 MW-3S 6/28/2010 <10 <1 42.4 259 <1 <1 <0.001 4510 MW-31) 12/16/2008 26 <2 8 259 <0.5 1.22 <0.002 68 MW-31) 6/22/2009 34 <1 8 233 <1 1.25 <0.001 <10 MW-31) 12/14/2009 26 <1 <5 271 <1 1.3 <0.001 11.2 MW-31) 6/28/2010 34 <1 8.09 263 <1 1.3 0.001 29.4 MW-4S 12/16/2008 30 <2 17 304 <0.5 2.43 <0.002 370 MW-4S 6/22/2009 33 <1 16 287 <1 3.08 0.001 287 MW-4S 12/14/2009 27 <1 22 340 <1 2.8 <0.001 654 MW-4S 6/28/2010 34 <1 21.7 328 <1 3.3 <0.001 221 MW-4S 2/5/2013 44 <5 262 361 <5 18 0.016 11200 MW-4S 10/15/2013 31 <1 28 337 <1 <5 <0.005 50 MW-4S 2/4/2014 30 <1 26 331 <1 <5 <0.005 283 MW-4S 6/3/2014 -- -- -- -- -- -- - MW-4S 10/7/2014 29 <1 30 341 <1 <5 <0.005 1020 MW-4S 2/3/2015 30 <1 36 353 <1 <5 <0.005 1890 MW-4S 6/1/2015 33 <1 30 348 <1 <5 <0.005 48 MW-4S 10/8/2015 -- <10 167 378 <10 20 0.013 21900 MW-4S 2/2/2016 58 2.4 105 455 <1 15 0.009 16700 MW-4S 6/6/2016 -- -- -- -- -- -- - MW-4D 12/16/2008 33 <2 91 258 <0.5 1.59 <0.002 2640 MW-41) 6/22/2009 40 <1 79 230 <1 1.52 <0.001 2050 MW-41) 12/14/2009 33 <1 82.5 268 <1 1.4 <0.001 1970 MW-41) 6/28/2010 41 <1 94.8 259 <1 2.2 0.002 2720 MW-41) 2/5/2013 33 <1 74 251 <1 <5 <0.005 1080 MW-41) 10/15/2013 35 <1 68 270 <1 <5 <0.005 786 MW-41) 2/4/2014 34 <1 72 284 <1 <5 <0.005 1250 MW-41) 6/3/2014 -- -- -- -- -- -- - MW-4D 10/7/2014 34 <1 77 285 <1 <5 <0.005 2040 MW-41) 2/3/2015 33 <1 71 289 <1 <5 <0.005 1230 MW-41) 6/1/2015 34 <1 74 294 <1 <5 <0.005 1160 MW-41) 10/8/2015 33 <1 71 297 <1 <5 <0.005 680 MW-41) 2/2/2016 31 <1 73 304 <1 <5 <0.005 1010 MW-41) 6/6/2016 -- -- -- -- -- -- - MW-5S 12/16/2008 3.4 <2 14 172 <0.5 <1 <0.002 87 MW-5S 6/22/2009 5.1 <1 13 149 <1 <1 <0.001 63 MW-5S 12/14/2009 3.6 <1 15.1 159 <1 <1 <0.001 28.4 MW-5S 6/28/2010 31 <1 15.1 138 <1 <1 0.001 30.7 Riverbend Steam Station Page 7 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 250 10 700 700 2 10 1 300 Well ID MW-5S Units: Sample Date, 12/6/2010 mg/L Sulfate µg/L Arsenic -- µg/L Barium - µg/L Boron - µg/L Cadmium µg/L Chromium - mg/L Copper - µg/L MW-5S 2/1/2011 - MW-5S 6/7/2011 -- - - - - MW-5S 10/4/2011 -- -- -- -- -- -- - MW-5S 2/4/2013 11 <1 21 336 <1 <5 <0.005 155 MW-5S 10/15/2013 13 <1 24 421 <1 <5 <0.005 371 MW-5S 2/4/2014 14 <1 25 470 <1 <5 <0.005 551 MW-5S 6/3/2014 -- -- -- -- -- -- - MW-5S 10/7/2014 13 <1 26 422 <1 <5 <0.005 134 MW-5S 2/3/2015 13 <1 26 438 <1 <5 <0.005 88 MW-5S 6/2/2015 13 <1 30 447 <1 <5 <0.005 58 MW-5S 10/8/2015 8.8 <1 17 312 <1 <5 <0.005 14 MW-5S 2/2/2016 11 <1 29 409 <1 <5 <0.005 339 MW-5S 6/6/2016 -- -- -- -- -- -- - MW-5D 12/16/2008 50 <2 37 227 <0.5 1.89 <0.002 23 MW-51) 6/22/2009 61 <1 34 213 <1 2.05 0.009 <10 MW-SD 12/14/2009 51 <1 36 258 <1 2.1 <0.001 12 MW-51) 6/28/2010 64 <1 35 263 <1 2.3 0.002 11.5 MW-51) 2/4/2013 47 <1 34 337 <1 <5 <0.005 208 MW-51) 10/15/2013 50 <1 34 357 <1 <5 <0.005 129 MW-SD 2/4/2014 47 <1 33 384 <1 <5 <0.005 41 MW-51) 6/3/2014 -- -- -- -- -- -- - MW-5D 10/7/2014 47 <1 35 393 <1 <5 <0.005 508 MW-51) 2/3/2015 46 <1 33 417 <1 <5 <0.005 182 MW-SD 6/2/2015 45 <1 38 412 <1 <5 <0.005 1110 MW-51) 10/8/2015 45 <1 33 429 <1 <5 <0.005 21 MW-SD 2/2/2016 44 <1 33 452 <1 <5 <0.005 51 MW-51) 6/6/2016 -- -- -- -- -- -- - MW-6S 12/16/2008 36 <2 13 214 <0.5 1.53 <0.002 1230 MW-6S 6/22/2009 44 <1 9 194 <1 1.36 <0.001 167 MW-6S 12/14/2009 37 <1 9.44 236 <1 <1 <0.001 328 MW-6S 6/28/2010 47 <1 8.8 233 <1 <1 <0.001 144 MW-6S 12/6/2010 -- -- -- -- -- -- - MW-6S 2/1/2011 - MW-6S 6/7/2011 - - - - - MW-6S 10/4/2011 -- -- -- -- -- -- - MW-6D 12/16/2008 35 <2 8 307 <0.5 <1 <0.002 75 MW-61) 6/22/2009 44 <1 8 270 <1 <1 0.002 39 MW-61) 12/14/2009 36 <1 8 319 <1 <1 <0.001 70 MW-61) 6/28/2010 38 <1 7.6 298 <1 <1 0.001 53.4 MW-75R 12/6/2010 0.97 <1 29 <50 <1 <5 <0.005 125 MW-7SR 2/2/2011 0.22 <1 20 <50 <1 <5 <0.005 790 MW-75R 6/6/2011 0.17 <1 21 <50 <1 <5 <0.005 495 MW-7SR 10/4/2011 0.17 <1 18 <50 <1 <5 <0.005 532 MW-75R 2/22/2012 <1 <1 16 <50 <1 <5 <0.005 285 MW-7SR 6/5/2012 0.13 <1 15 <50 <1 <5 <0.005 520 MW-75R 10/3/2012 0.19 <1 15 <50 <1 <5 <0.005 221 MW-7SR 2/4/2013 0.21 <1 14 <50 <1 <5 <0.005 158 MW-75R 6/3/2013 0.15 <1 14 <50 <1 <5 <0.005 155 MW-7SR 10/14/2013 0.16 <1 14 <50 <1 <5 <0.005 445 MW-7SR 2/5/2014 0.16 <1 12 <50 <1 <5 <0.005 166 MW-7SR 6/2/2014 0.12 <1 14 <50 <1 <5 <0.005 117 MW-75R 10/6/2014 0.14 <1 13 <50 <1 <5 <0.005 110 MW-7SR 2/2/2015 0.17 <1 14 <50 <1 <5 <0.005 154 MW-7SR 6/1/2015 0.18 <1 30 <50 <1 14 0.013 558 MW-7SR 10/7/2015 0.13 <1 14 <50 <1 <5 <0.005 70 Riverbend Steam Station Page 8 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 250 10 700 700 2 10 1 300 Well ID MW-7SR Units: Sample Date, 2/1/2016 mg/L Sulfate 0.16 µg/L Arsenic <1 µg/L Barium 14 µg/L Boron <50 µg/L Cadmium <1 µg/L Chromium <5 mg/L Copper <0.005 µg/L 116 MW-7SR 6/6/2016 -- -- -- -- -- -- - MW-7D 12/16/2008 0.27 <2 25 <100 <0.5 <1 <0.002 11 MW-71) 6/22/2009 0.31 <1 24 <100 <1 <1 <0.001 10 MW-71) 12/14/2009 0.22 <1 25 <50 <1 <1 <0.001 <10 MW-71) 6/28/2010 <1 <1 25.1 <50 <1 <1 0.001 <10 MW-71) 12/6/2010 0.22 <1 25 <50 <1 <5 <0.005 <10 MW-71) 2/2/2011 0.21 <1 25 <50 <1 <5 <0.005 <10 MW-71) 6/6/2011 0.21 <1 26 <50 <1 <5 <0.005 <10 MW-71) 10/4/2011 0.22 <1 26 <50 <1 <5 <0.005 <10 MW-71) 2/22/2012 <1 <1 26 <50 <1 <5 <0.005 <10 MW-71) 6/5/2012 0.19 <1 26 <50 <1 <5 <0.005 <10 MW-71) 10/3/2012 0.2 <1 27 <50 <1 <5 <0.005 <10 MW-71) 2/4/2013 0.25 <1 27 <50 <1 <5 <0.005 <10 MW-71) 6/3/2013 0.18 <1 27 <50 <1 <5 <0.005 <10 MW-71) 10/14/2013 0.2 <1 27 <50 <1 <5 <0.005 <10 MW-71) 2/5/2014 0.18 <1 26 <50 <1 <5 <0.005 <10 MW-71) 6/2/2014 0.15 <1 27 <50 <1 <5 <0.005 <10 MW-71) 10/6/2014 0.16 <1 26 <50 <1 <5 <0.005 26 MW-71) 2/2/2015 0.16 <1 27 <50 <1 <5 <0.005 <10 MW-71) 6/1/2015 0.14 <1 28 <50 <1 <5 <0.005 20 MW-71) 10/7/2015 0.14 <1 27 <50 <1 <5 <0.005 35 MW-71) 2/1/2016 0.14 <1 27 <50 <1 <5 <0.005 <10 MW-71) 6/6/2016 -- -- -- -- -- -- - MW-8S 12/6/2010 0.58 <1 47 <50 <1 <5 <0.005 53 MW-8S 2/1/2011 0.39 <1 48 <50 <1 <5 <0.005 41 MW-8S 6/7/2011 0.26 <1 51 <50 <1 <5 <0.005 73 MW-8S 10/3/2011 0.25 <1 51 <50 <1 <5 <0.005 16 MW-8S 2/6/2012 0.16 <1 50 <50 <1 <5 <0.005 58 MW-8S 6/4/2012 0.19 <1 53 <50 <1 <5 <0.005 24 MW-8S 10/3/2012 0.18 <1 52 <50 <1 <5 <0.005 19 MW-8S 2/4/2013 0.17 <1 51 <50 <1 <5 <0.005 12 MW-8S 6/3/2013 0.15 <1 55 <50 <1 <5 <0.005 71 MW-8S 10/14/2013 0.18 <1 57 <50 <1 <5 <0.005 68 MW-8S 2/4/2014 0.15 <1 56 <50 <1 <5 <0.005 90 MW-8S 6/2/2014 0.16 <1 58 <50 <1 <5 <0.005 23 MW-8S 10/6/2014 0.19 <1 58 <50 <1 <5 <0.005 14 MW-8S 2/2/2015 0.23 <1 57 <50 <1 <5 <0.005 77 MW-8S 6/1/2015 0.28 <1 61 <50 <1 <5 <0.005 177 MW-8S 10/7/2015 0.16 <1 57 <50 <1 <5 <0.005 172 MW-8S 2/1/2016 0.22 <1 58 53 <1 <5 <0.005 127 MW-8S 6/6/2016 -- -- -- -- -- -- - MW-81 12/6/2010 0.66 <1 53 <50 <1 <5 <0.005 787 MW-81 2/1/2011 1.2 <1 48 <50 <1 <5 <0.005 643 M W-81 6/7/2011 1.2 <1 41 <50 <1 <5 <0.005 812 MW-81 10/3/2011 1.1 <1 44 <50 <1 <5 <0.005 942 MW-81 2/6/2012 0.57 <1 40 <50 <1 <5 <0.005 976 MW-81 6/4/2012 0.46 <1 38 <50 <1 <5 <0.005 853 MW-81 10/3/2012 0.35 <1 37 <50 <1 <5 <0.005 618 MW-81 2/4/2013 0.27 <1 35 <50 <1 <5 <0.005 497 MW-81 6/3/2013 0.25 <1 30 <50 <1 <5 <0.005 593 MW-81 10/14/2013 0.26 <1 29 <50 <1 <5 <0.005 436 MW-81 2/4/2014 0.24 <1 29 <50 <1 <5 <0.005 618 MW-81 6/2/2014 0.21 <1 31 <50 <1 <5 <0.005 629 MW-81 10/6/2014 0.21 <1 43 <50 <1 <5 0.007 2460 MW-81 2/2/2015 0.22 <1 44 <50 <1 <5 0.008 2510 Riverbend Steam Station Page 9 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 250 10 700 700 2 10 1 300 Well ID MW-81 Units: Sample Date, 6/1/2015 mg/L Sulfate 0.19 µg/L Arsenic <1 µg/L Barium 38 µg/L Boron <50 µg/L Cadmium <1 µg/L Chromium.. <5 mg/L <0.005 µg/L 1410 MW-81 10/7/2015 0.18 <1 38 <50 <1 <5 <0.005 1350 MW-81 2/1/2016 0.21 <1 30 <50 <1 <5 <0.005 315 MW-81 6/6/2016 -- -- -- -- -- -- - MW-8D 12/6/2010 0.7 <1 67 <50 <1 <5 <0.005 2640 MW-81) 2/1/2011 0.74 <1 43 <50 <1 <5 <0.005 1330 MW-81) 6/7/2011 0.71 <1 34 <50 <1 <5 <0.005 777 MW-81) 10/3/2011 0.74 <1 39 <50 <1 <5 <0.005 954 MW-81) 2/6/2012 0.62 <1 44 <50 <1 <5 <0.005 1480 MW-81) 6/4/2012 0.76 <1 46 <50 <1 <5 <0.005 1320 MW-81) 10/3/2012 0.53 <1 45 <50 <1 5 <0.005 2050 MW-81) 2/4/2013 1.3 <1 36 <50 <1 <5 <0.005 1720 MW-81) 6/3/2013 1.4 <1 27 <50 <1 <5 <0.005 1680 MW-81) 10/14/2013 1.1 <1 23 <50 <1 <5 <0.005 948 MW-81) 2/4/2014 0.97 <1 44 <50 <1 6 <0.005 4160 MW-81) 6/2/2014 0.8 <1 31 <50 <1 <5 <0.005 2410 MW-81) 10/6/2014 0.56 <1 35 <50 <1 <5 <0.005 2750 MW-81) 2/2/2015 0.45 <1 25 <50 <1 <5 <0.005 1120 MW-81) 6/1/2015 0.55 <1 20 <50 <1 <5 <0.005 658 MW-81) 10/7/2015 0.56 <1 19 <50 <1 <5 <0.005 429 MW-81) 2/1/2016 0.64 <1 18 <50 <1 <5 <0.005 363 MW-81) 6/6/2016 -- -- -- -- -- -- - MW-9 12/6/2010 23 <1 89 <50 <1 <5 <0.005 2440 MW-9 2/1/2011 22 <1 61 <50 <1 <5 <0.005 1110 MW-9 6/6/2011 24 <1 60 <50 <1 <5 <0.005 1060 MW-9 10/4/2011 23 <1 58 <50 <1 <5 <0.005 464 MW-9 2/6/2012 28 <1 71 <50 <1 <5 <0.005 1870 MW-9 6/5/2012 29 <1 62 <50 <1 <5 <0.005 381 MW-9 10/3/2012 30 <1 65 <50 <1 <5 <0.005 569 MW-9 2/4/2013 32 <1 74 <50 <1 <5 <0.005 1950 MW-9 6/4/2013 35 <1 70 <50 <1 <5 <0.005 1130 MW-9 10/15/2013 35 <1 66 <50 <1 <5 <0.005 341 MW-9 2/5/2014 36 <1 69 <50 <1 <5 <0.005 263 MW-9 6/2/2014 34 <1 69 <50 <1 <5 <0.005 272 MW-9 10/6/2014 31 <1 63 <50 <1 <5 <0.005 209 MW-9 2/3/2015 28 <1 59 <50 <1 <5 <0.005 140 MW-9 6/2/2015 25 <1 65 <50 <1 <5 <0.005 1620 MW-9 10/6/2015 25 <1 59 <50 <1 <5 <0.005 248 MW-9 2/1/2016 21 <1 54 <50 <1 <5 <0.005 117 MW-9 6/6/2016 -- -- -- -- -- -- - MW-10 12/6/2010 12 <1 71 125 <1 <5 <0.005 1710 MW-10 2/1/2011 19 <1 63 194 <1 <5 <0.005 1420 MW-10 6/7/2011 12 <1 41 115 <1 <5 <0.005 147 MW-10 10/3/2011 35 <1 73 370 <1 <5 <0.005 634 MW-10 2/6/2012 11 <1 44 94 <1 <5 <0.005 310 MW-10 6/4/2012 14 <1 41 123 <1 <5 <0.005 72 MW-10 10/3/2012 40 <1 76 383 <1 <5 <0.005 235 MW-10 2/4/2013 21 <1 51 178 <1 <5 <0.005 79 MW-10 6/4/2013 11 <1 42 96 <1 <5 <0.005 509 MW-10 10/15/2013 38 <1 77 353 <1 <5 <0.005 295 MW-10 2/3/2014 18 <1 49 145 <1 <5 <0.005 220 MW-10 6/2/2014 16 <1 48 127 <1 <5 <0.005 921 MW-10 10/6/2014 39 <1 91 396 <1 <5 <0.005 291 MW-10 2/2/2015 26 <1 63 204 <1 <5 <0.005 252 MW-10 6/1/2015 19 <1 59 175 <1 7 <0.005 301 MW-10 10/6/2015 38 <1 89 409 <1 <5 <0.005 298 Riverbend Steam Station Page 10 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 250 10 700 700 2 10 1 300 Well ID MW-10 Units: Sample Date, 2/1/2016 mg/L Sulfate 13 µg/L Arsenic <1 µg/L Barium 36 µg/L Boron 106 µg/L Cadmium <1 µg/L Chromium <5 mg/L Copper <0.005 µg/L 863 MW-10 6/6/2016 -- -- -- -- -- -- - MW-11SR 2/1/2011 45 <1 32 366 <1 <5 <0.005 486 MW-11SR 6/6/2011 47 <1 31 365 <1 <5 <0.005 138 MW-11SR 10/3/2011 45 <1 29 368 <1 <5 <0.005 87 MW-11SR 2/6/2012 46 <1 26 371 <1 <5 <0.005 63 MW-11SR 6/4/2012 45 <1 26 362 <1 <5 <0.005 39 MW-11SR 10/3/2012 43 <1 25 368 <1 <5 <0.005 30 MW-11SR 2/4/2013 44 <1 25 349 <1 <5 <0.005 28 MW-11SR 6/3/2013 44 <1 26 390 <1 <5 <0.005 38 MW-11SR 10/14/2013 43 <1 26 379 <1 <5 <0.005 67 MW-11SR 2/3/2014 41 <1 25 377 <1 <5 <0.005 20 MW-11SR 6/2/2014 41 <1 26 366 <1 <5 <0.005 62 MW-11SR 10/6/2014 41 <1 25 346 <1 <5 <0.005 109 MW-11SR 2/2/2015 40 <1 24 352 <1 <5 <0.005 33 MW-11SR 6/1/2015 40 <1 26 349 <1 <5 <0.005 -- MW-11SR 10/6/2015 41 <1 27 412 <1 <5 <0.005 40 MW-11SR 2/1/2016 36 <1 23 339 <1 <5 <0.005 103 MW-11SR 6/6/2016 -- -- -- -- -- -- - MW-11DR 2/1/2011 44 <1 75 362 <1 <5 <0.005 21 MW-11DR 6/6/2011 45 <1 78 362 <1 <5 <0.005 13 MW-11DR 10/3/2011 42 <1 79 369 <1 <5 <0.005 <10 MW-11DR 2/6/2012 45 <1 77 374 <1 <5 <0.005 11 MW-11DR 6/4/2012 44 <1 78 366 <1 <5 <0.005 <10 MW-11DR 10/3/2012 42 <1 76 372 <1 <5 <0.005 <10 MW-11DR 2/4/2013 43 <1 75 342 <1 <5 <0.005 <10 MW-11DR 6/3/2013 44 <1 81 413 <1 <5 <0.005 11 MW-11DR 10/14/2013 43 <1 72 375 <1 <5 <0.005 <10 MW-11DR 2/3/2014 40 <1 71 367 <1 <5 <0.005 <10 MW-11DR 6/2/2014 41 <1 69 353 <1 <5 <0.005 <10 MW-11DR 10/6/2014 41 <1 63 342 <1 <5 <0.005 24 MW-11DR 2/2/2015 40 <1 60 349 <1 <5 <0.005 28 MW-11DR 6/1/2015 39 <1 58 334 <1 <5 <0.005 10 MW-11DR 10/6/2015 34 <1 48 302 <1 <5 <0.005 35 MW-11DR 2/1/2016 34 <1 48 327 <1 <5 <0.005 <10 MW-11DR 6/6/2016 -- -- -- -- -- -- -- MW-13 12/6/2010 17 <1 260 60 <1 <5 <0.005 13500 MW-13 2/1/2011 17 <1 250 <50 <1 <5 <0.005 19000 MW-13 6/7/2011 16 <1 232 52 <1 <5 <0.005 18300 MW-13 10/4/2011 15 <1 295 62 <1 <5 <0.005 20600 MW-13 2/6/2012 17 <1 203 54 <1 <5 <0.005 19300 MW-13 6/5/2012 15 <1 219 61 <1 <5 <0.005 19200 MW-13 10/3/2012 14 <1 305 65 <1 <5 <0.005 23000 MW-13 2/5/2013 14 <1 289 <50 <1 <5 <0.005 21100 MW-13 6/3/2013 16 <1 264 64 <1 <5 <0.005 16900 MW-13 10/15/2013 17 <1 177 50 <1 <5 <0.005 7690 MW-13 2/3/2014 29 <1 319 <50 <1 <5 <0.005 37700 MW-13 6/2/2014 15 <1 275 61 <1 <5 <0.005 24200 MW-13 10/6/2014 16 <1 298 71 <1 <5 <0.005 21000 MW-13 2/2/2015 18 <1 315 <50 <1 <5 0.019 30300 MW-13 6/1/2015 16 <1 282 56 <1 <5 <0.005 24100 MW-13 10/6/2015 15 <1 307 78 <1 <5 <0.005 22500 MW-13 2/1/2016 32 <1 320 <50 <1 <5 <0.005 22600 MW-13 6/6/2016 -- -- -- -- -- -- - MW-14 12/6/2010 32 <1 10 143 <1 <5 <0.005 554 MW-14 2/1/2011 30 <1 10 109 <1 <5 <0.005 378 Riverbend Steam Station Page 11 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 250 10 700 700 2 10 1 300 Well ID Units: Sample Date mg/L Sulfate µg/L Arsenic µg/L Barium µg/L Boron µg/L Cadmium µg/L Chromium mg/L Copper µg/L MW-14 6/7/2011 36 <1 10 104 <1 <5 <0.005 175 MW-14 10/4/2011 29 <1 9 149 <1 <5 <0.005 58 MW-14 2/6/2012 35 <1 15 96 <1 6 <0.005 935 MW-14 6/5/2012 32 <1 12 90 <1 <5 <0.005 206 MW-14 10/3/2012 31 <1 11 124 <1 <5 <0.005 98 MW-14 2/4/2013 35 <1 10 109 <1 <5 <0.005 104 MW-14 6/3/2013 27 <1 11 <50 <1 <5 <0.005 371 MW-14 10/15/2013 27 <1 11 <50 <1 <5 <0.005 374 MW-14 2/3/2014 30 <1 12 <50 <1 <5 <0.005 660 MW-14 6/2/2014 27 <1 11 <50 <1 <5 <0.005 686 MW-14 10/6/2014 27 <1 11 <50 <1 <5 <0.005 472 MW-14 2/2/2015 34 <1 12 <50 <1 <5 <0.005 421 MW-14 6/1/2015 27 <1 11 <50 <1 <5 <0.005 369 MW-14 10/6/2015 32 <1 11 <50 <1 <5 <0.005 234 MW-14 2/1/2016 30 <1 12 79 <1 6 <0.005 949 MW-14 6/6/2016 -- -- -- -- -- -- - MW-15 2/23/2011 29 <1 71 284 <1 5 <0.005 227 MW-15 6/6/2011 33 <1 86 294 <1 <5 <0.005 274 M W-15 10/3/2011 28 <1 81 314 <1 <5 <0.005 198 MW-15 2/6/2012 26 <1 76 302 <1 <5 <0.005 399 MW-15 6/5/2012 30 <1 78 290 <1 <5 <0.005 45 MW-15 10/3/2012 28 <1 76 315 <1 <5 <0.005 55 MW-15 2/4/2013 27 <1 75 288 <1 <5 <0.005 58 MW-15 6/3/2013 28 <1 80 305 <1 <5 <0.005 74 MW-15 10/14/2013 29 <1 80 312 <1 <5 <0.005 168 MW-15 2/3/2014 27 <1 79 294 <1 <5 <0.005 75 MW-15 6/2/2014 28 <1 83 273 <1 5 <0.005 230 MW-15 10/6/2014 28 <1 79 295 <1 <5 <0.005 465 MW-15 2/2/2015 28 <1 74 301 <1 <5 <0.005 72 MW-15 6/1/2015 29 <1 87 284 <1 9 0.005 144 MW-15 10/6/2015 30 <1 85 314 <1 6 <0.005 233 MW-15 2/1/2016 28 <1 74 282 <1 <5 <0.005 108 MW-15 6/6/2016 -- -- -- -- -- -- - -- Notes: 1. °C indicates temperature measured in degrees celsius 2. mV indicates oxidation/reduction potential measured in millivolts 3. [fa/cm indicates specific conductivity measured in micromhos per centimeter 4. mg/L indicates concentrations measured in milligrams per liter 5. µg/L indicates concentrations measured in micrograms per liter 6. SU indicates pH values measured in standard units 7. NTU indicates turbidity values measured in Nephalometric Turbidity Units 8. Parameters are compared to standards found in 15A NCAC Subchapter 02L Classifications and Water Quality Standards Applicable to the Groundwaters of North Carolina 9. 2L Standards are established as part of 15A NCAC 02L .0202 10. Interim Maximum Allowable Concentrations (IMACs) can be found in Appendix #1 of 15A NCAC Subchapter 02L Classifications and Water Quality Standards Applicable to the Groundwaters of North Carolina Riverbend Steam Station Page 12 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 15 50 0.2 100 1 1 20 1 NS Units: µg/L µg/L µg/L µg/L mg/L µg/L µg/L µg/L NTU f Well ID Sample Date Lead Manganese Thallium Nickel Zinc Antimony* Selenium Mercury Turbidity (Field) MW-IS 12/16/2008 <2 3300 <2 0.007 - <2 <0.05 49.3 MW-1S 6/22/2009 <1 2950 <1 0.007 <1 <0.05 19.3 MW-IS 12/14/2009 <1 3130 <1 <0.005 - <1 <0.05 9.59 MW-1S 6/28/2010 <1 2880 <1 <0.005 <1 <0.05 6.91 MW-1D 12/16/2008 <2 439 4.92 0.006 - <2 <0.05 3.1 MW-1D 6/22/2009 <1 433 5.48 0.007 <1 <0.05 2.25 MW-1D 12/14/2009 <1 476 5.4 0.009 - <1 <0.05 1.27 MW-1D 6/28/2010 <1 478 5.4 0.01 <1 <0.05 1.31 MW-2S 12/16/2008 <2 258 <2 0.006 - <2 <0.05 6.06 MW-2S 6/22/2009 <1 208 1.72 <0.005 <1 <0.05 5.65 MW-2S 12/14/2009 <1 218 1.7 0.007 - <1 <0.05 5.53 MW-2S 6/28/2010 <1 225 1.8 0.006 <1 <0.05 2.56 MW-2D 12/16/2008 <2 42 <2 <0.005 - <2 <0.05 34.5 MW-2D 6/22/2009 <1 27 1.01 <0.005 <1 <0.05 24.2 MW-2D 12/14/2009 <1 27 - <1 0.009 - <1 <0.05 16.9 MW-2D 6/28/2010 <1 15 <1 <0.005 <1 <0.05 2.24 MW-3S 12/16/2008 <2 991 - 2.15 <0.005 - <2 <0.05 29.7 MW-3S 6/22/2009 <1 1750 2.86 <0.005 - <1 <0.05 13.2 MW-3S 12/14/2009 <1 1750 2 <0.005 - <1 <0.05 56.8 MW-3S 6/28/2010 <1 1890 2.4 <0.005 - <1 <0.05 21.3 MW-3D 12/16/2008 <2 <5 <2 <0.005 - <2 <0.05 1.52 MW-3D 6/22/2009 <1 <5 <1 <0.005 <1 <0.05 0.22 MW-3D 12/14/2009 <1 <5 - <1 <0.005 - <1 <0.05 2.66 MW-3D 6/28/2010 <1 <5 <1 <0.005 <1 <0.05 5.15 MW-4S 12/16/2008 <2 229 <2 0.018 - <2 <0.05 135 MW-4S 6/22/2009 <1 187 1.91 0.03 <1 <0.05 41.5 MW-4S 12/14/2009 1.2 187 - 1.8 0.059 - <1 <0.05 119 MW-4S 6/28/2010 <1 199 -- 1.3 0.012 -- <1 <0.05 22 MW-4S 2/5/2013 31.3 1750 <1 16 0.281 <5 5.62 <0.5 0 MW-4S 10/15/2013 <1 189 <0.2 <5 <0.005 <1 <1 <0.05 2.38 MW-4S 2/4/2014 <1 212 <0.2 <5 0.01 <1 <1 <0.05 5.03 MW-4S 6/3/2014 -- -- -- -- -- -- -- -- 11.3 MW-4S 10/7/2014 <1 517 <0.2 <5 0.008 <1 <1 <0.05 99.4 MW-4S 2/3/2015 <1 555 <0.2 <5 0.011 <1 <1 <0.05 97.1 MW-4S 6/1/2015 <1 354 <0.2 <5 0.007 <1 <1 0.07 3.06 MW-4S 10/8/2015 22.2 495 <2 12 0.119 <10 <10 0.07 0 MW-4S 2/2/2016 10.8 758 <0.2 13 0.096 <1 <1 <0.05 0 MW-4S 6/6/2016 -- -- -- -- -- -- -- -- 684 MW-4D 12/16/2008 <2 74 - <2 0.009 - <2 0.074 137 MW-4D 6/22/2009 <1 60 2.04 0.009 <1 0.052 60 MW-4D 12/14/2009 <1 59.7 1.8 0.008 -- <1 0.074 89.5 MW-4D 6/28/2010 <1 64.9 -- 2.8 0.012 -- <1 <0.05 86.1 MW-4D 2/5/2013 <1 48 <0.2 <5 0.006 <1 <1 <0.05 43.6 MW-4D 10/15/2013 <1 34 <0.2 <5 <0.005 <1 <1 <0.05 12.9 MW-4D 2/4/2014 <1 36 <0.2 <5 0.006 <1 <1 0.06 19.1 MW-4D 6/3/2014 -- -- -- -- -- -- -- -- 47 MW-4D 10/7/2014 <1 38 <0.2 <5 0.007 <1 <1 <0.05 31.5 MW-4D 2/3/2015 <1 32 <0.2 <5 <0.005 <1 <1 <0.05 18.2 MW-4D 6/1/2015 <1 32 <0.2 <5 <0.005 <1 <1 0.1 17.6 MW-4D 10/8/2015 <1 27 <0.2 <5 <0.005 <1 <1 <0.05 9.3 MW-4D 2/2/2016 <1 26 <0.2 <5 <0.005 1.98 <1 <0.05 15.2 MW-4D 6/6/2016 -- -- -- -- -- -- -- -- 33.3 MW-5S 12/16/2008 <2 44 <2 <0.005 - <2 0.058 17.3 MW-5S 6/22/2009 <1 36 <1 <0.005 - <1 0.061 3.4 MW-5S 12/14/2009 <1 54 <1 <0.005 - <1 0.161 8.31 MW-5S 6/28/2010 <1 46.6 <1 <0.005 <1 0.061 7.12 Riverbend Steam Station Page 13 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 15 50 0.2 100 1 1 20 1 NS Well ID MW-5S MW-5S MW-5S Units: Sample Date 12/6/2010 2/1/2011 6/7/2011 µg/L µg/L - µg/L - µg/L mg/L µg/L - - - µg/L - - µg/L NTU MW-5S 10/4/2011 -- -- -- -- -- -- - MW-5S 2/4/2013 <1 120 <0.2 <5 <0.005 <1 <1 0.14 8.94 MW-5S 10/15/2013 <1 50 <0.2 <5 <0.005 <1 <1 0.58 8.21 MW-5S 2/4/2014 <1 54 <0.2 <5 <0.005 <1 <1 0.18 9.65 MW-5S 6/3/2014 -- -- -- -- -- -- -- -- 6.61 MW-5S 10/7/2014 <1 93 <0.2 <5 <0.005 <1 <1 <0.05 2.9 MW-5S 2/3/2015 <1 110 <0.2 <5 <0.005 <1 <1 0.22 4.74 MW-5S 6/2/2015 <1 37 <0.2 <5 <0.005 <1 <1 0.1 1.49 MW-5S 10/8/2015 <1 10 <0.2 <5 <0.005 <1 <1 0.09 1.93 MW-5S 2/2/2016 <1 315 <0.2 <5 <0.005 <1 <1 0.07 2.05 MW-5S 6/6/2016 -- -- -- -- -- -- -- -- 1.97 MW-5D 12/16/2008 <2 49 <2 <0.005 - <2 <0.05 0.74 MW-5D 6/22/2009 <1 30 <1 <0.005 - <1 <0.05 0.31 MW-SD 12/14/2009 <1 26.9 - <1 <0.005 - <1 <0.05 3.57 MW-5D 6/28/2010 <1 17 -- <1 <0.005 -- <1 <0.05 6.38 MW-5D 2/4/2013 <1 22 <0.2 <5 <0.005 <1 <1 <0.05 9 MW-5D 10/15/2013 <1 20 <0.2 <5 <0.005 <1 <1 <0.05 3.85 MW-SD 2/4/2014 <1 <5 <0.2 <5 <0.005 7.9 <1 <0.05 2.6 MW-5D 6/3/2014 -- -- -- -- -- -- -- -- 8.92 MW-SD 10/7/2014 <1 14 <0.2 <5 <0.005 <1 <1 <0.05 5.43 MW-5D 2/3/2015 <1 6 <0.2 <5 <0.005 <1 <1 <0.05 5.42 MW-SD 6/2/2015 <1 22 <0.2 <5 <0.005 <1 <1 <0.05 6.16 MW-5D 10/8/2015 <1 11 <0.2 <5 <0.005 <1 <1 <0.05 1.47 MW-SD 2/2/2016 <1 6 <0.2 <5 0.006 <1 <1 <0.05 1.78 MW-5D 6/6/2016 -- -- -- -- -- -- -- -- 1.95 MW-6S 12/16/2008 <2 93 <2 <0.005 - <2 <0.05 168 MW-6S 6/22/2009 <1 53 <1 <0.005 <1 <0.05 8.88 MW-6S 12/14/2009 <1 66.3 - <1 <0.005 - <1 <0.05 19.8 MW-6S 6/28/2010 <1 57 <1 <0.005 <1 <0.05 3.67 MW-6S 12/6/2010 -- -- - -- -- - MW-6S 2/1/2011 - MW-6S 6/7/2011 - - - MW-6S 10/4/2011 -- -- -- -- - MW-6D 12/16/2008 <2 8 - <2 <0.005 - <2 <0.05 2.67 MW-6D 6/22/2009 <1 6 <1 <0.005 - <1 <0.05 1.21 MW-6D 12/14/2009 <1 7 - <1 <0.005 - <1 <0.05 3.23 MW-6D MW-75R MW-7SR MW-75R MW-7SR MW-75R MW-7SR MW-75R MW-7SR 6/28/2010 12/6/2010 2/2/2011 6/6/2011 10/4/2011 2/22/2012 6/5/2012 10/3/2012 2/4/2013 <1 <1 <1 <1 <1 <1 <1 <1 <1 6.42 256 413 304 167 113 122 67 43 -- <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <1 7 <5 <5 <5 <5 <5 <5 <5 <0.005 0.006 <0.005 <0.005 <0.005 <0.005 0.005 <0.005 <0.005 -- <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 4.91 2.76 2.84 6.25 4.39 1.8 0.8 1.28 1.34 MW-75R 6/3/2013 <1 38 <0.2 <5 <0.005 <1 <1 <0.05 0.81 MW-7SR 10/14/2013 <1 68 <0.2 <5 <0.005 <1 <1 <0.05 9.17 MW-7SR 2/5/2014 <1 40 <0.2 <5 <0.005 <1 <1 <0.05 3.02 MW-7SR 6/2/2014 <1 33 <0.2 <5 <0.005 <1 <1 <0.05 5.66 MW-75R 10/6/2014 <1 31 <0.2 <5 <0.005 <1 <1 <0.05 3.19 MW-7SR 2/2/2015 <1 40 <0.2 <5 0.007 <1 <1 <0.05 4.65 MW-7SR 6/1/2015 <1 54 <0.2 14 0.018 <1 <1 <0.05 8.8 MW-7SR 10/7/2015 <1 25 <0.2 <5 <0.005 <1 <1 <0.05 2.51 Riverbend Steam Station Page 14 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 15 50 0.2 100 1 1 20 1 NS Units: µg/L µg/L µg/L µg/L mg/L µg/L µg/L µg/L NTU Well r SampleD. MW-75R 2/1/2016 <1 32 <0.2 <5 <0.005 2.19 <1 <0.05 3.97 MW-7SR 6/6/2016 -- -- -- -- -- -- -- -- 0.99 MW-7D 12/16/2008 <2 7 <2 0.006 <2 <0.05 1.22 MW-7D 6/22/2009 <1 <5 <1 <0.005 - <1 <0.05 3.07 MW-7D 12/14/2009 <1 <5 - <1 0.006 - <1 <0.05 1.13 MW-7D 6/28/2010 <1 <5 -- <1 0.006 -- <1 <0.05 1.14 MW-7D 12/6/2010 <1 <5 <0.2 <5 0.005 <1 <1 <0.05 0.74 MW-7D 2/2/2011 <1 <5 <0.2 <5 <0.005 <1 <1 <0.05 8.82 MW-7D 6/6/2011 <1 <5 <0.2 <5 <0.005 <1 <1 <0.05 0.59 MW-7D 10/4/2011 <1 <5 <0.2 <5 <0.005 <1 <1 <0.05 0.44 MW-7D 2/22/2012 <1 <5 <0.2 <5 <0.005 <1 <1 <0.05 1.48 MW-7D 6/5/2012 <1 <5 <0.2 <5 <0.005 <1 <1 <0.05 1.2 MW-7D 10/3/2012 <1 <5 <0.2 <5 <0.005 <1 <1 <0.05 0.29 MW-7D 2/4/2013 <1 <5 <0.2 <5 0.005 <1 <1 <0.05 0.89 MW-7D 6/3/2013 <1 <5 <0.2 <5 <0.005 <1 <1 <0.05 0.42 MW-7D 10/14/2013 <1 <5 <0.2 <5 <0.005 1.04 <1 <0.05 3 MW-7D 2/5/2014 <1 <5 <0.2 <5 0.006 <1 <1 <0.05 2.05 MW-7D 6/2/2014 <1 <5 <0.2 <5 0.006 <1 <1 <0.05 4.73 MW-7D 10/6/2014 <1 <5 <0.2 <5 <0.005 <1 <1 <0.05 3.25 MW-7D 2/2/2015 <1 <5 <0.2 <5 0.007 <1 <1 <0.05 6.5 MW-7D 6/1/2015 <1 <5 <0.2 <5 <0.005 <1 <1 <0.05 3.04 MW-7D 10/7/2015 <1 <5 <0.2 <5 <0.005 <1 <1 <0.05 4.57 MW-7D 2/1/2016 <1 <5 <0.2 <5 <0.005 1.82 <1 <0.05 1.94 MW-7D 6/6/2016 -- -- -- -- -- -- -- -- 0.53 MW-8S 12/6/2010 <1 123 <0.2 <5 <0.005 <1 <1 <0.05 13.2 MW-8S 2/1/2011 <1 135 <0.2 <5 <0.005 <1 <1 <0.05 18 MW-8S 6/7/2011 <1 144 <0.2 <5 <0.005 <1 <1 <0.05 9.98 MW-8S 10/3/2011 <1 135 <0.2 <5 <0.005 <1 <1 <0.05 7.89 MW-8S 2/6/2012 <1 133 <0.2 <5 0.005 <1 <1 <0.05 16 MW-8S 6/4/2012 <1 126 <0.2 <5 <0.005 <1 <1 <0.05 6.76 MW-8S 10/3/2012 <1 104 <0.2 <5 <0.005 <1 <1 <0.05 7.65 MW-8S 2/4/2013 <1 90 <0.2 <5 <0.005 <1 <1 <0.05 2.77 MW-8S 6/3/2013 <1 87 <0.2 <5 <0.005 <1 <1 <0.05 4.18 MW-8S 10/14/2013 <1 78 <0.2 <5 <0.005 <1 <1 <0.05 6.12 MW-8S 2/4/2014 <1 68 <0.2 <5 <0.005 <1 <1 <0.05 7.07 MW-8S 6/2/2014 <1 77 <0.2 <5 0.007 <1 <1 <0.05 9.46 MW-8S 10/6/2014 <1 64 <0.2 <5 <0.005 <1 <1 <0.05 2.72 MW-8S 2/2/2015 <1 55 <0.2 <5 <0.005 <1 <1 <0.05 7.42 MW-8S 6/1/2015 <1 69 <0.2 <5 <0.005 <1 <1 <0.05 10.7 MW-8S 10/7/2015 <1 57 <0.2 <5 <0.005 <1 <1 <0.05 9.6 MW-8S 2/1/2016 <1 67 <0.2 <5 0.006 <1 <1 <0.05 7.4 MW-8S 6/6/2016 -- -- -- -- -- -- -- -- 9.77 MW-81 12/6/2010 <1 538 <0.2 <5 <0.005 <1 <1 <0.05 32.2 MW-81 2/1/2011 <1 290 <0.2 <5 <0.005 <1 <1 <0.05 20.4 MW-81 6/7/2011 <1 43 <0.2 <5 <0.005 <1 <1 <0.05 17.7 MW-81 10/3/2011 <1 52 <0.2 <5 <0.005 <1 <1 <0.05 37.2 MW-81 2/6/2012 <1 32 <0.2 <5 0.006 <1 <1 <0.05 32.2 MW-81 6/4/2012 <1 39 <0.2 <5 <0.005 <1 <1 <0.05 38.7 MW-81 10/3/2012 <1 23 <0.2 <5 <0.005 <1 <1 <0.05 23 MW-81 2/4/2013 <1 168 <0.2 <5 <0.005 <1 <1 <0.05 19.8 MW-81 6/3/2013 <1 93 <0.2 <5 <0.005 <1 <1 <0.05 14.1 MW-81 10/14/2013 <1 24 <0.2 <5 <0.005 <1 <1 <0.05 9.87 MW-81 2/4/2014 <1 15 <0.2 <5 <0.005 <1 <1 <0.05 10.8 MW-81 6/2/2014 <1 47 <0.2 <5 <0.005 <1 <1 <0.05 18.2 MW-81 10/6/2014 <1 44 <0.2 <5 0.008 <1 <1 <0.05 43.2 MW-81 2/2/2015 <1 38 <0.2 <5 0.009 <1 <1 <0.05 51.6 Riverbend Steam Station Page 15 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 15 50 0.2 100 1 1 20 1 NS Units: µg/L µg/L µg/L µg/L mg/L µg/L µg/L µg/L NTU Well ID Sample Date MW-81 6/1/2015 <1 30 <0.2 <5 0.006 <1 <1 <0.05 20.8 MW-81 10/7/2015 <1 18 <0.2 <5 <0.005 <1 <1 <0.05 26.2 MW-81 2/1/2016 <1 10 <0.2 <5 <0.005 <1 <1 <0.05 6.43 MW-81 6/6/2016 -- -- -- -- -- -- -- -- 13.5 MW-8D 12/6/2010 <1 743 <0.2 <5 0.012 <1 <1 <0.05 217 MW-8D 2/1/2011 <1 671 <0.2 <5 <0.005 <1 <1 <0.05 60 MW-8D 6/7/2011 <1 622 <0.2 <5 <0.005 <1 <1 <0.05 25 MW-8D 10/3/2011 <1 535 <0.2 <5 <0.005 <1 <1 <0.05 27.4 MW-8D 2/6/2012 <1 452 <0.2 <5 0.007 <1 <1 <0.05 41.4 MW-8D 6/4/2012 <1 174 <0.2 <5 0.007 <1 <1 <0.05 76 MW-8D 10/3/2012 <1 82 <0.2 <5 0.009 <1 <1 <0.05 100 MW-8D 2/4/2013 <1 143 <0.2 <5 0.009 <1 <1 <0.05 44 MW-8D 6/3/2013 <1 86 <0.2 <5 0.006 <1 <1 <0.05 36 MW-8D 10/14/2013 <1 34 <0.2 <5 <0.005 <1 <1 <0.05 24.7 MW-8D 2/4/2014 <1 118 <0.2 <5 0.014 <1 <1 <0.05 110 MW-8D 6/2/2014 <1 35 <0.2 <5 0.01 <1 <1 <0.05 93.7 MW-8D 10/6/2014 <1 74 <0.2 <5 0.009 <1 <1 <0.05 72.4 MW-8D 2/2/2015 <1 31 <0.2 <5 <0.005 <1 <1 <0.05 32.6 MW-8D 6/1/2015 <1 12 <0.2 <5 <0.005 <1 <1 <0.05 16 MW-8D 10/7/2015 <1 20 <0.2 <5 <0.005 <1 <1 <0.05 11.9 MW-8D 2/1/2016 <1 <5 <0.2 <5 0.005 <1 <1 <0.05 8.77 MW-8D 6/6/2016 -- -- -- -- -- -- -- -- 38.8 MW-9 12/6/2010 1.87 282 <0.2 <5 0.01 <1 <1 <0.05 139 MW-9 2/1/2011 <1 147 <0.2 <5 <0.005 <1 <1 <0.05 29.5 MW-9 6/6/2011 <1 87 <0.2 <5 0.006 <1 <1 <0.05 21.2 MW-9 10/4/2011 <1 62 <0.2 <5 <0.005 <1 <1 <0.05 12.6 MW-9 2/6/2012 1.23 68 <0.2 <5 0.009 <1 <1 <0.05 49.7 MW-9 6/5/2012 <1 25 <0.2 <5 <0.005 <1 <1 <0.05 14.3 MW-9 10/3/2012 <1 25 <0.2 <5 <0.005 <1 <1 <0.05 14.4 MW-9 2/4/2013 1.12 49 <0.2 <5 0.007 <1 <1 <0.05 37 MW-9 6/4/2013 <1 20 <0.2 <5 <0.005 <1 <1 <0.05 10.3 MW-9 10/15/2013 <1 10 <0.2 <5 <0.005 <1 <1 <0.05 5.82 MW-9 2/5/2014 <1 7 <0.2 <5 <0.005 <1 <1 <0.05 4.79 MW-9 6/2/2014 <1 7 <0.2 <5 <0.005 <1 <1 <0.05 4.28 MW-9 10/6/2014 <1 5 <0.2 <5 <0.005 <1 <1 <0.05 3.56 MW-9 2/3/2015 <1 <5 <0.2 <5 <0.005 <1 <1 <0.05 5.07 MW-9 6/2/2015 <1 19 <0.2 <5 0.008 <1 <1 <0.05 18.6 MW-9 10/6/2015 <1 9 0.204 <5 <0.005 <1 <1 <0.05 3.95 MW-9 2/1/2016 <1 5 <0.2 <5 <0.005 1.91 <1 <0.05 3.63 MW-9 6/6/2016 -- -- -- -- -- -- -- -- 8.05 MW-10 12/6/2010 2.59 198 <0.2 <5 0.009 <1 <1 <0.05 182 MW-10 2/1/2011 1.15 242 <0.2 <5 <0.005 <1 <1 <0.05 84.1 MW-10 6/7/2011 <1 72 <0.2 <5 <0.005 <1 <1 <0.05 6.92 MW-10 10/3/2011 <1 355 <0.2 <5 <0.005 <1 <1 <0.05 29.7 MW-10 2/6/2012 <1 67 <0.2 <5 <0.005 <1 <1 <0.05 10.7 MW-10 6/4/2012 <1 48 <0.2 <5 <0.005 <1 <1 <0.05 3.19 MW-10 10/3/2012 <1 232 <0.2 <5 <0.005 <1 <1 <0.05 8.19 MW-10 2/4/2013 <1 33 <0.2 <5 <0.005 <1 <1 <0.05 5.23 MW-10 6/4/2013 <1 21 <0.2 <5 <0.005 <1 <1 <0.05 7.73 MW-10 10/15/2013 <1 133 <0.2 <5 <0.005 <1 <1 <0.05 6.95 MW-10 2/3/2014 <1 19 <0.2 <5 <0.005 <1 <1 <0.05 5.81 MW-10 6/2/2014 <1 37 <0.2 <5 0.009 <1 <1 <0.05 21.7 MW-10 10/6/2014 <1 132 <0.2 <5 <0.005 <1 <1 <0.05 4.32 MW-10 2/2/2015 <1 124 <0.2 <5 <0.005 <1 <1 <0.05 4.28 MW-10 6/1/2015 <1 68 <0.2 6 0.009 <1 <1 <0.05 5.08 MW-10 10/6/2015 <1 59 <0.2 <5 <0.005 <1 <1 <0.05 6.97 Riverbend Steam Station Page 16 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 15 50 0.2 100 1 1 20 1 NS Units: µg/L µg/L µg/L µg/L mg/L µg/L µg/L µg/L NTU Well r Sample Date Lead Manganese Thallium Nickel Zinc Antimony* Selenium Mercury Turbidity (Field) MW-10 2/1/2016 <1 218 <0.2 <5 <0.005 1.84 <1 <0.05 6.47 MW-10 6/6/2016 -- -- -- -- -- -- -- -- 3.32 MW-11SR 2/1/2011 <1 384 <0.2 <5 <0.005 <1 <1 <0.05 11 MW-11SR 6/6/2011 <1 59 <0.2 <5 <0.005 <1 <1 <0.05 3.44 MW-11SR 10/3/2011 <1 30 <0.2 <5 <0.005 <1 <1 <0.05 6.13 MW-11SR 2/6/2012 <1 24 <0.2 <5 <0.005 <1 <1 <0.05 2.72 MW-11SR 6/4/2012 <1 17 <0.2 <5 <0.005 <1 <1 <0.05 2.35 MW-11SR 10/3/2012 <1 16 <0.2 <5 <0.005 <1 <1 <0.05 1.37 MW-11SR 2/4/2013 <1 12 <0.2 <5 <0.005 <1 <1 <0.05 2.05 MW-11SR 6/3/2013 <1 12 <0.2 <5 <0.005 <1 <1 <0.05 3.53 MW-11SR 10/14/2013 <1 14 <0.2 <5 <0.005 <1 <1 <0.05 5.07 MW-11SR 2/3/2014 <1 8 <0.2 <5 <0.005 <1 <1 <0.05 2.55 MW-11SR 6/2/2014 <1 9 <0.2 <5 <0.005 <1 <1 <0.05 3.34 MW-11SR 10/6/2014 <1 10 <0.2 <5 <0.005 <1 <1 <0.05 5.44 MW-11SR 2/2/2015 <1 7 <0.2 <5 <0.005 <1 <1 <0.05 2.41 MW-11SR 6/1/2015 <1 8 <0.2 <5 <0.005 <1 <1 <0.05 2.48 MW-11SR 10/6/2015 <1 8 <0.2 <5 <0.005 <1 <1 <0.05 1.75 MW-11SR 2/1/2016 <1 8 <0.2 <5 <0.005 1.98 <1 <0.05 6.23 MW-11SR 6/6/2016 -- -- -- -- -- -- -- -- 4.45 MW-11DR 2/1/2011 <1 168 <0.2 <5 <0.005 <1 <1 <0.05 2.6 MW-11DR 6/6/2011 <1 103 <0.2 <5 0.008 <1 <1 <0.05 0.68 MW-11DR 10/3/2011 <1 87 <0.2 <5 0.009 <1 <1 <0.05 3.4 MW-11DR 2/6/2012 <1 101 <0.2 <5 0.011 <1 <1 <0.05 0.64 MW-11DR 6/4/2012 <1 92 <0.2 <5 0.01 <1 <1 <0.05 0.18 MW-11DR 10/3/2012 <1 87 <0.2 <5 0.009 <1 <1 <0.05 0.94 MW-11DR 2/4/2013 <1 88 <0.2 <5 0.009 <1 <1 <0.05 1.24 MW-11DR 6/3/2013 <1 93 <0.2 <5 0.01 <1 <1 <0.05 2.24 MW-11DR 10/14/2013 <1 60 <0.2 <5 <0.005 <1 <1 <0.05 2.24 MW-11DR 2/3/2014 <1 51 <0.2 <5 0.007 <1 <1 <0.05 1.94 MW-11DR 6/2/2014 <1 51 <0.2 <5 0.008 <1 <1 <0.05 1.55 MW-11DR 10/6/2014 <1 18 <0.2 <5 <0.005 <1 <1 <0.05 1.66 MW-11DR 2/2/2015 <1 8 <0.2 <5 0.132 <1 <1 <0.05 1.77 MW-11DR 6/1/2015 <1 <5 <0.2 <5 <0.005 <1 <1 <0.05 0.94 MW-11DR 10/6/2015 <1 <5 <0.2 <5 <0.005 <1 <1 <0.05 1.2 MW-11DR 2/1/2016 <1 <5 <0.2 <5 <0.005 1.96 <1 <0.05 2.16 MW-11DR 6/6/2016 -- -- -- -- -- -- -- -- 2.58 MW-13 12/6/2010 <1 10900 <0.2 <5 <0.005 <1 <1 <0.05 5.26 MW-13 2/1/2011 <1 11200 <0.2 <5 <0.005 <1 <1 <0.05 3.26 MW-13 6/7/2011 <1 10400 <0.2 <5 <0.005 <1 <1 <0.05 6.4 MW-13 10/4/2011 <1 10000 <0.2 <5 <0.005 <1 <1 <0.05 7.67 MW-13 2/6/2012 <1 10300 <0.2 <5 <0.005 <1 <1 <0.05 3.14 MW-13 6/5/2012 <1 10300 <0.2 <5 <0.005 <1 <1 <0.05 3.15 MW-13 10/3/2012 <1 10300 <0.2 <5 <0.005 <1 <1 <0.05 2.4 MW-13 2/5/2013 <1 10500 <0.2 <5 <0.005 <1 <1 <0.05 3.75 MW-13 6/3/2013 <1 10100 <0.2 <5 <0.005 <1 <1 <0.05 9.32 MW-13 10/15/2013 <1 8070 <0.2 <5 <0.005 <1 <1 <0.05 18.8 MW-13 2/3/2014 <1 10300 <0.2 11 <0.005 <1 <1 <0.05 18.3 MW-13 6/2/2014 <1 10000 <0.2 <5 <0.005 <1 <1 <0.05 4.67 MW-13 10/6/2014 <1 10100 <0.2 <5 <0.005 <1 <1 <0.05 2.44 MW-13 2/2/2015 <1 9330 <0.2 6 <0.005 <1 <1 <0.05 13.7 MW-13 6/1/2015 <1 8760 <0.2 <5 <0.005 <1 <1 <0.05 7.78 MW-13 10/6/2015 <1 8650 <0.2 <5 <0.005 1.05 <1 <0.05 4.38 MW-13 2/1/2016 <1 7390 <0.2 10 <0.005 2.1 <1 <0.05 8.61 MW-13 6/6/2016 -- -- -- -- -- -- -- -- 3.98 MW-14 12/6/2010 <1 270 <0.2 6 <0.005 <1 <1 <0.05 25.6 MW-14 2/1/2011 <1 55 <0.2 <5 <0.005 <1 <1 <0.05 14.4 Riverbend Steam Station Page 17 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 15 50 0.2 100 1 1 20 1 NS Units: µg/L µg/L µg/L µg/L mg/L µg/L µg/L µg/L NTU Well ID Sample Date Lead Manganese Thallium Nickel Zinc Antirnony* Selenium Mercury Turbidity (Field) MW-14 6/7/2011 <1 43 <0.2 <5 <0.005 <1 <1 <0.05 6.09 MW-14 10/4/2011 <1 193 <0.2 <5 <0.005 <1 <1 <0.05 12.9 MW-14 2/6/2012 <1 353 <0.2 9 <0.005 <1 <1 <0.05 4.31 MW-14 6/5/2012 <1 56 <0.2 <5 <0.005 <1 <1 <0.05 1.85 MW-14 10/3/2012 <1 20 <0.2 <5 <0.005 <1 <1 <0.05 2.04 MW-14 2/4/2013 <1 18 <0.2 <5 <0.005 <1 <1 <0.05 3.92 MW-14 6/3/2013 <1 63 <0.2 <5 <0.005 <1 <1 <0.05 3.24 MW-14 10/15/2013 <1 81 <0.2 <5 <0.005 <1 <1 <0.05 5.48 MW-14 2/3/2014 <1 205 <0.2 <5 <0.005 <1 <1 <0.05 8.64 MW-14 6/2/2014 <1 185 <0.2 6 <0.005 <1 <1 <0.05 8.21 MW-14 10/6/2014 <1 90 <0.2 <5 <0.005 <1 <1 <0.05 6.52 MW-14 2/2/2015 <1 126 <0.2 <5 <0.005 <1 <1 <0.05 4.89 MW-14 6/1/2015 <1 132 <0.2 <5 <0.005 <1 <1 <0.05 5.08 MW-14 10/6/2015 <1 99 <0.2 <5 <0.005 <1 <1 <0.05 3.96 MW-14 2/1/2016 <1 62 <0.2 <5 <0.005 2.23 <1 <0.05 11.7 MW-14 6/6/2016 -- -- -- -- -- -- -- -- 5.65 MW-15 2/23/2011 <1 55 <0.2 <5 0.006 <1 1.98 <0.05 13.2 MW-15 6/6/2011 <1 64 <0.2 <5 <0.005 <1 1.79 <0.05 10.8 MW-15 10/3/2011 <1 81 <0.2 <5 <0.005 <1 1.97 <0.05 10.9 MW-15 2/6/2012 <1 86 <0.2 <5 0.007 <1 1.91 <0.05 7.99 MW-15 6/5/2012 <1 52 <0.2 <5 <0.005 <1 2.03 <0.05 2.73 MW-15 10/3/2012 <1 46 <0.2 <5 0.005 <1 2.08 <0.05 4.16 MW-15 2/4/2013 <1 49 <0.2 <5 0.006 <1 1.93 <0.05 3.35 MW-15 6/3/2013 <1 45 <0.2 <5 0.005 <1 1.58 <0.05 1.5 MW-15 10/14/2013 <1 58 <0.2 <5 <0.005 <1 1.83 <0.05 3.83 MW-15 2/3/2014 <1 50 <0.2 <5 0.006 <1 1.58 <0.05 2.15 MW-15 6/2/2014 <1 41 <0.2 <5 0.006 <1 1.7 <0.05 6.02 MW-15 10/6/2014 <1 53 <0.2 <5 <0.005 <1 1.78 <0.05 2.48 MW-15 2/2/2015 <1 45 <0.2 <5 0.007 <1 1.39 <0.05 2.59 MW-15 6/1/2015 <1 37 <0.2 6 0.011 <1 1.76 <0.05 1.77 MW-15 10/6/2015 <1 23 <0.2 <5 <0.005 <1 1.52 <0.05 4.67 MW-15 2/1/2016 <1 71 <0.2 <5 <0.005 1.97 1.48 <0.05 2.27 MW-15 6/6/2016 -- -- -- -- -- -- -- -- 2.5 Notes: 1. °C indicates temperature measured in degrees celsius 2. mV indicates oxidation/reduction potential measured in millivolts 3. µO/cm indicates specific conductivity measured in micromhos per centimeter 4. mg/L indicates concentrations measured in milligrams per liter 5. µg/L indicates concentrations measured in micrograms per liter 6. SU indicates pH values measured in standard units 7. NTU indicates turbidity values measured in Nephalometric Turbidity Units 8. Parameters are compared to standards found in 15A NCAC Subchapter 02L Classifications and Water Quality Standards Applicable to the Groundwaters of North Carolina 9. 2L Standards are established as part of 15A NCAC 02L .0202 10. Interim Maximum Allowable Concentrations (IMACs) can be found in Appendix #1 of 15A NCAC Subchapter 02L Classifications and Water Quality Standards Applicable to the Groundwaters of North Carolina Riverbend Steam Station Page 18 of 18 CSA Supplement 2 Table 1-3: Range of 2L Groundwater Standard Exceedances from NPDES Sampling 2L Standard: 10 300 so 1 6.5 - 8.5 Well ID M W-7SR Date Range 12/6/2010 Units: - 6/6/2016 µg/L Chromium 14 µg/L Iron 445 - 790 µg/L Manganese 54 - 413 µg/L Antimony 2.19 SU PH 4.96 - 5.48 MW-71) 12/16/2008 - 6/6/2016 No Exceedances No Exceedances No Exceedances 1.04 -1.82 5.47 - 5.92 MW-8S 12/6/2010 - 6/6/2016 No Exceedances No Exceedances 55 -144 No Exceedances 4.34 - 5.33 MW-81 12/6/2010 - 6/6/2016 No Exceedances 315 - 2,510 52 - 538 No Exceedances 5.65 - 6.4 MW-81) 12/6/2010 - 6/6/2016 No Exceedances 363 - 4,160 74 - 743 No Exceedances 6.27 - 6.49 *MW-9 12/6/2010 - 6/6/2016 No Exceedances 341- 2,440 62 - 282 1.91 5.82 - 6.4 *MW-10 12/6/2010 - 6/6/2016 No Exceedances 301-1,710 59 - 355 1.84 4.8 - 5.57 MW-11SR 2/1/2011- 6/6/2016 No Exceedances 486 59 - 384 1.98 5.59 - 6.07 MW-11DR 2/1/2011- 6/6/2016 No Exceedances No Exceedances 51-168 1.96 5.55 - 6.0 *MW-13 12/6/2010 - 6/6/2016 No Exceedances 7,690- 37,700 7,390-11,200 1.05 - 2.1 5.76 - 6.35 MW-14 12/6/2010 - 6/6/2016 No Exceedances 369 - 949 55 - 353 2.23 No Exceedances MW-15 2/23/2011- 6/6/2016 No Exceedances 399 - 465 52 - 86 1.97 5.05 - 5.29 Note: Monitoring wells marked with * are located inside of the compliance boundary. Notes: 1. mg/L indicates concentrations measured in milligrams per liter 2. µg/L indicates concentrations measured in micrograms per liter 3. SU indicates pH values measured in standard units 4. Parameters are compared to standards found in 15A NCAC Subchapter 02L Classifications and Water Quality Standards Applicable to the Groundwaters of North Carolina 2L Standards are established as part of 15A NCAC 02L .0202 5. Interim Maximum Allowable Concentrations (IMACs) can be found in Appendix #1 of 15A NCAC Subchapter 02L Classifications and Water Quality Standards Applicable to the Groundwaters of North Carolina Riverbend Steam Station 1 of 1 CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments Check latitude and longitude shown on report cover pages (the HDR will review and provide corrected latitude and longitude coordinates for the sites in forthcoming General 1 conversion appears to be incorrect on the Mooresville region reports, if needed. reports and needs to be reconciled). "Proposed Provisional Background Concentrations" or PPBCs is the terminology used for statistically Background 2 Use terminology PEPA "provisional estimates for purposes of determined background concentrations in the CAP reporting. PPBCs are discussed in CAP Part 1, Section 2. assessment" provide for background concentrations of COls. The approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. COI Use results from porewater, groundwater and other media to COls were selected based on exceedances found in porewater, groundwater, soil, and surface water 3 develop COI list. sample results. Hexavalent Chromium is included as a CO] in CAP Part 1 data tables and is considered with respect to the include as COI at each site duer interest and due to NC DHHS screening level and has been carried forward with subsequent evaluations. Samples were COI 4 receptor recepwell results. Use NCDHHS screening ning value. analyzed for Hexavalent Chromium in select groundwater monitoring wells, and further Cr(VI) evaluation may take place based on the results of each site respectively. CAP Part 1, Section 1.9.2 states that Cr(VI) is included in the COI list. Need to evaluate vanadium and strontium at every site to show Vanadium has been considered across the sites in CSA reporting. Strontium was not included in the CSA COI 5 differences between background concentrations and potential tables, however strontium data was collected with other constituents, including vanadium, and is source -related concentrations. presented in the CSA Supplement 2. COI - Receptors 6 Add evaluation of receptor wells in CAP. Water supply wells are shown on Figure 1-3 in the CSA Supplement 2 along with analytical results facilitating the interpretation of receptor water quality relative to site water quality. Private and public water supply wells sampled should be shown Water supply wells are shown on Figure 1-3 in the CSA Supplement 2 along with analytical results COI - Receptors 7 on a map with zoom in boxes showing concentration results even facilitating the interpretation of receptor water quality relative to site water quality. if below 2L. COI - Receptors 8 Add table with all receptor well results. Water supply wells are shown on Figure 1-3 in the CSA Supplement 2 along with analytical results facilitating the interpretation of receptor water quality relative to site water quality. All private receptor wells shown on figures (use or add DEQ designations). All water supply wells are shown on Figure 1-3. Those water supply wells that can be shown in the COI - Receptors 9 Show results for detection constituents. viewports of the the potentiometric surface and isoconcentration figures in the CSA Supplement 2 are also included. A table of analytical results, including strontium, is included on Figure 1-3. Add strontium. Add total uranium and Ra226+228. DEQ considers radionuclides to be a driver of alpha activity in the ash basins. Sample the following locations both below ash ponds and other downgradient areas Select wells located downstream and along transects were sampled for these constituents in the CSA and COI where other constituent concentrations are high: Post-CSA sampling periods. At the time of the CSA Supplement 2, the analytical results from Round 5 had 10 Downgradient monitoring well locations, at locations with been received and upon review, were recommended for re -issue prior to completing review and inclusion exceedances, and at background locations. in the CSA Supplement 2. Upon receipt, these data will be provided in a subsequent submittal. Uranium and Ra226+228 may be included in NPDES monitoring. List Federal MCL as standard for Ra 226-228 and uranium. Source Characterization 11 Address soils as being primary and secondary sources —address in A separate risk assessment has been provided subsequent to the CSA report by Duke Energy via Haley & CAP and CSA supplement. Aldritch. Source Characterization Describe how geochemical conditions may affect release of 12 Discussion of geochemical conditions were provided in CAP Part 2 with geochemical modeling results. naturally occurring constituents such as iron and manganese. CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments Source Characterization 13 Soil to be identified as secondary source — due to leaching of ash A separate risk assessment has been provided subsequent to the CSA report by Duke Energy via Haley & onto unsaturated soil. Aldritch. Background soil concentrations need to be evaluated. Native soils Background 14 may be a source based on geochemical conditions in/beneath the Proposed Provisional Background Concentrations or PPBCs are discussed in CAP Part 1, Section 2. The ash ponds. Need to address background soil conditions and approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. relationship to observed 2L exceedances. "Proposed Provisional Background Concentrations" or PPBCs is the terminology used for statistically Background 15 Provide "provisional estimates" of background if there are determined background concentrations in the CAP reporting. PPBCs are discussed in CAP Part 1, Section 2. insufficient numbers of samples for statistics. The approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. A similar analysis/evaluation of downgradient soils and their Background 16 relationship to 2L exceedances also needs to be included in the Proposed Provisional Background Concentrations or PPBCs are discussed in CAP Part 1, Section 2. The approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. CAP. Background Potential release mechanisms need to be considered in the CAP 17 Discussion of potential migration pathways is discussed in CAP Part 2, Section 3.3 (i.e., migration of leachate beneath the ash basin, etc.). Background determinations. Background concentrations need to "Proposed Provisional Background Concentrations" or PPBCs is the terminology used for statistically be evaluated to determine site -specific constituent concentration determined background concentrations in the CAP reporting. PPBCs are discussed in CAP Part 1, Section 2. Background 18 levels and this evaluation needs to be included in CAP. Use all The approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section available historic data from compliance wells and newly installed wells. 4. Background groundwater monitoring wells need to be sampled 2 Background 19 more times before the end of 2015 (samples need to be These samples have been collected. Data from Rounds 2 through 4 was included in the CAP Part 2. speciated). Separate background concentrations need to be determined for "Proposed Provisional Background Concentrations" or PPBCs are discussed in CAP Part 1, Section 2. The Background 20 shallow, intermediate and deep flow layers (as well as any other approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. site -specific conditions like wetlands). This approach includes consideration to these calcuations by flow layer. Background 21 Use all available site data (include example background wells PHR, Background data from historical sources was utilized where applicable in the CAP Part 2. FGD, Craig Rd.). Well and Constituents 22 Wells must meet 2C rule requirements; turbidity cannot impact Results from Round 5 sampling are presented in the CSA Supplement 2 and wells with turbidity results results. above 10 NTU are identified so that results may be qualified upon review. Elevated pH and turbidity must be addressed or well must be Duke Energy has installed additional monitoring wells to address concerns with elevated pH and turbidity Well and Constituents 23 redeveloped or replaced. seen when sampling as well as to refine understanding of exceedances. Results from the Round 5, including additional assessment wells, has been included in CSA Supplement 2. Include discussion of pH and turbidity in background well "Proposed Provisional Background Concentrations" or PPBCs are discussed in CAP Part 1, Section 2. The Well and Constituents 24 discussion. approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. This approach includes consideration to these calcuations by utilizing viable samples below 10 NTU. "Proposed Provisional Background Concentrations" or PPBCs are discussed in CAP Part 1, Section 2. The Well and Constituents 25 Results above 10 NTU to be removed from data set for statistics. approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. This approach includes consideration to these calcuations by utilizing viable samples below 10 NTU. CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments Soil Contamination 27 General Resolution delineation of COls are noted on cross sections included in the CSA Supplement 2. anuw tAWFIL of pmn nguleb dew un uu»>eu.wnb. Compare soil results to Preliminary Soil Remediation Goals (PSRG) Where additional soil samples were collected as part of the installation of additional assessment wells, for protection of groundwater standards (POG). those results will be presented to PSRG POG standards. Soil Contamination 28 roIKL vs. rw are issue Tor seiectea constituents; tnis may require uuKe tnergy worKea witn the Taos to reauce the reporting emits. however, iowenng me roircL to Detow ine resampling. FOG was not able to be achieved to date for certain constituents. Soils PSRGs, detection limits above standards is problematic. Soil Contamination 29 Review IHSB Guidelines for Assessment and Cleanup section Duke Energy worked with the labs to reduce the reporting limits. However, lowering the MRL to below the 4.1.1.2 to develop site specific background values for soil, if FOG was not able to be achieved to date for certain constituents. applicable Soil Contamination 30 Cr(VI) is driving risk, use Cr(VI) in review. In the CAP reporting as well as CSA Supplement 2, Cr(VI) is added to the list of Cols in groundwater. Soil Contamination 31 Need to compare soils results to Cr(VI) (not Cr(III)). Soils will be compared to the PSRG POG Cr(VI) standard of 3.8 mg/kg in subsequent reporting, where additional soil samples were collected. Hydrology/geologic controls and the effects on contaminant On June 25, 2015, NCDEQ requested that these geochemical issues be addressed in a Site Conceptual and transport are not discussed in CSA. Discuss Model. This topic was introduced in the CSA and announced that the SCM would be refined as an iterative Hydrologdistribution and Chemical Controls Chemical Controls 32 relative to DO, pH, Eh, etc. It is imperative that this discussion be process in the forthcoming CAP. CAP Part 1 Section 3.2.2 included discussion of general geochemical included as part of CAP #1 as this is requirement of CAMA. The characteristics such as cations/anions, redox potential, solute speciation, and Kd testing. These items were discussion can be refined in CAP #2. further addressed in CAP Part 2 Section 2.4.4, and Section 3.3. On June 25, 2015, NCDEQ requested that these geochemical issues be addressed in a Site Conceptual Model. This topic was introduced in the CSA and announced that the SCM would be refined as an iterative Hydrology/Geology and Discuss how geochemical conditions affect contaminant process in the forthcoming CAP. CAP Part 1 Section 3.2.2 included discussion of general geochemical Chemical Controls 33 distribution? (Geochemical "halo' releasing Mn and Fe). characteristics such as cations/anions, redox potential, solute speciation, and Kd testing. These items are further addressed in CAP Part 2 Section 2.4.4: Site Geochemistry and Influence on COls, which treats spatial distribution of groundwater geochemistry relative to the source area. Hydrology/Geology and 34 Specify where differences exist from LeGrand conceptual model. The CAP Part 2 report states where the model is consistent with LeGrand, specifically in the Groundwater Chemical Controls Migration subsection, and the COI Occurrence and Distribution Section. Groundwater velocities in bedrock and transition zone appear to Hydrology/Geology and Chemical Controls 35 be too high. Verify or correct these values. Describe transmissivity These values were corrected and updated in CAP Part 2 Appendix A. concept versus joint flow velocity. Hydrology/Geology and 36 Explain why one contaminant may be elevated in a particular area. CAP Part 2 Section 3.7 included an expanded discussion of site geochemical controls on contaminant Chemical Controls mobility and migration to address this concern. Hydrology/Geology and 37 Describe how constituents are mobilized or attenuated CAP Part 2 Section 3.7 included an expanded discussion of site geochemical controls on contaminant Chemical Controls . mobility and migration to address this concern. Describe geochemical conditions and mechanisms, and charges, The groundwater model considers linear adsorption (Freundlich adsorption for select COls in the Buck Hydrology/Geology and along flow paths. DEQ considers flow paths to be from the model) for COls (except sulfate and chloride). The adsorption term (Kd) is uniform within the model Chemical Controls 38 maximum concentration for a COI to a receptor or to the domain, including from the active and inactive ash basins/storage (sources) to downgradient monitor wells compliance boundary. and the compliance boundary. CAP Part 2, Appendix B, groundwater model. Hydrology/Geology and 39 Describe nature of sorptive materials present in three-part system Sorption constants and calculations are described in CAP Part 2 Section 4.3, in the methodology subsection Chemical Controls and along flow paths to receptors. CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments The groundwater model is setup per source area and then calibrated to concentrations observed in downgradient monitor wells. Calibration to observed concentrations is achieved by adjusting source Describe how boron, sulfate, TDS "islands" are located along flow concentrations within active/inactive ash basins and ash storage areas within the measured values, Hydrology/Geology and adjusting hydraulic conductivity based on reported values, adjusting kd based on lab data, and other chemical Controls 40 paths and how these are considered/incorporated into HGCM and measured hydrogeologic properties. The calibration attempts to match concentrations observed in numerical models. downgradient monitor wells by matching the flow paths and thus the observed COI "islands". The model did not incorporate TDS (boron and sulfate are both included in the groundwater model. CAP Part 2, Appendix B, groundwater model. Hydrology/Geology and Chemical Controls Hydrology/Geology and Chemical Controls Hydrogeologic and Other Geochemical Conceptual Subsurface drainage systems at dike/dams should be shown and 41 potential impacts to fate & transport modeling should be Subsurface drainage systems are shown and discussed in Section 4 of the CSA reports. They are shown in described in in hydrogeologic and geochemical conceptual the CSA Section 4 Figures. models. Pond, river, and lake elevations will be shown on figures where applicable. For example, in the CSA 42 Show measured water levels on ponds, streams, rivers. Supplement 2, these elevations are included on the shallow potentiometric figures, but not on all flow 43 Refined conceptual model needs to be presented in CAP I. Site Conceptual Models were updated and included in the CAP Part 2. Hydrogeologic and Other Geochemical Conceptual Models 44 Hydrogeo and geochemical conceptual models need to be discussed in terms of specific source areas. Include upgradient, source, and downgradient. Develop narrative for each source area and downgradient footprint (flow system recharge/discharge, horizontal flow direction, flow paths emanating from all sides (include map). CAP Part 2 Section 2.4.4 included discussion of geochemical parameters with consideration to whether there are trends upgradient or downgradient from the source. The refined SCM also included flow paths determined across the entire site. Hydrogeologic and Other Explain implications of vertical gradients in recharge and discharge Vertical hydraulic gradients were calculated for Round 2 data, and were included in CAP Part 1. The Geochemical Conceptual Models 45 area in each source area and its downgradient footprint. patterns in vertical gradients are discussed in CAP Part 2 Section 2.3.1.1. Hydrogeologic and Other Include effects f receptor wells in discussion. Also include In CAP Part 2 Appendix C, the issue of pumping wells is discussed. Where appropriate,. pumping wells are Geochemical Conceptual 46 possible impactssfrom basin to receptors in conceptual model included as an influence in the groundwater model. For example, for the DEC Cliffside site, the pumping Models discussions. wells weren't modeled because of the influence of the Broad River. Other DEC sites, such as Allen, Belews Creek, and Buck, the pumping wells were included in the model. Hydrogeologic and Other Site heterogeneities are not adequately explained. Explain existing The groundwater models are being updated and recalibrated including new data as it has becoms available Geochemical Conceptual 47 heterogeneities and implications for fate and transport modeling. as part of the expanded groundwater model domain activities. Uncertainties and limitations will be Models Describe uncertainties and explain impact of uncertainties. presented as part of the results, which are expected to be completed during Fall 2016. Hydrogeologic and Other The groundwater models are being updated and recalibrated including new data as it has becoms available Geochemical Conceptual 48 Explain impact of uncertainties in conceptual model. as part of the expanded groundwater model domain activities. Uncertainties and limitations will be Models presented as part of the results, which are expected to be completed during Fall 2016. Hydrogeologic and Other Geochemical Conceptual 49 Models Hydrogeologic and Other Geochemical Conceptual 50 Models Ensure that streams, wetlands, etc. shown in Section 12 are included on all figures as needed. Include in conceptual model discussions as appropriate. Description of AMEC ecological survey report findings not utilized in report or in figures. Data should be used, shown on figures or not. CAP Part 2 Section 2 figures include wetlands and streams. Ecological data concerning vegetation was included in the CSA Section 12 Risk Assessment and referenced in the Eco-Checklists provided for each site. CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments I Type Comment Number Comment Batch geochemical modeling for each of three layers per General Resolution As provided in CAP Part 2 Modeling Appendix B, Model Construction Section, each constituent was Modeling 51 constituent with narrative of what happens along flow path. modeled in one of 7 layers, which fall into the following categories: Ash material, Dike and ash storage Select flow path alignment with MOD PATH. material, Alluvium, M1 Saprolite, M2 Saprolite, Transition Zone, and Fractured bedrock. Describe geochemical conditions and mechanisms, and charges, Modeling 52 along flow paths. DEQ considers flow paths to be from the MODPATH was used to identify and delineate flow paths. This is displayed in CAP Part 2 Modeling Appendix maximum concentration for a COI to a receptor or to the B, Model Calibration in the particle tracking figure. compliance boundary. Model should use highest COPC in source area for model input. The model presented in the CAP Part 2 Appendix B uses variable concentrations in the source areas to Modeling 53 There will be different flow paths as flow path is based on match downgradient concentrations observed in monitor wells. In areas where the flow path from the maximum concentration of COI. source to an elevated observed concentration in a monitor well is observed, the highest measured source concentration is used in the model. Impacts from Fe, Mn are not related to Kd — how will modeling The groundwater model does not address Fe and Mn, however the geochemical modeling report does Modeling 54 treat Fe and Mn as COls (CAP Part 2 Appendix E), and determines the forms they likely exist in under address these constituents? conditions at the respective sites (CAP Part 2 Appendix E Section 2: Pourbaix diagrams). Modeling 55 Groundwater modeling should use site specific Kds. Sorption terms were developed and utilized as part of the groundwater modeling presented in CAP Part 2, Appendix B. Describe Kds and HFO or soil samples in areas not affected by ash. Modeling 56 Explain differences between these Kds and Kds from impacted A uniform Kd value for the groundwater model was utilized as these values are variable from sample to sample, regardless of site location (CAP Part 2, Appendix A, Groundwater Model). areas. Groundwater flow modeling in CAP needs to account for cumulative effect of off -site receptor wells (i.e., water supply The cumulative effect of off -site receptor wells were accounted for in the groundwater modeling (CAP Part wells). Need to come up with some assumptions regarding depth 2 Modeling Appendix B). The yield of these wells was estimated at 400 gpd, which is the average EPA I 57 and yield. CSA reports generally discount potential for upgradient household usage. The groundwater models are being updated and recalibrated including new data as it flow direction resulting from off -site pumping. Model results need has becoms available as part of the expanded groundwater model domain activities, including water supply to be included in the CAP now and revise once results are in from well information. Uncertainities and limitations will be presented as part of the results, which are expected data gap wells that are located to help inform groundwater flow to be completed during Fall 2016. direction near the property boundary. The groundwater model was calibrated to steady-state flow conditions and considered water levels from summer 2015. Historic water levels in the ponds were not modeled. The timing of start of the ash Modeling 58 Address historic water levels in pond in groundwater modeling. operations in different basins was considered in the groundwater model. The groundwater models are being updated and recalibrated including new data as it has becoms available as part of the expanded groundwater model domain activities, including historic water levels. Need to discuss how groundwater model results are incorporated The CAP Part 1 Surface water modeling Appendix details how groundwater model results are incorporated Modeling 59 in surface water model results (including how on -site streams are in surface water model results. incorporated). Modeling 60 Deep rock groundwater flow not well presented relative to off -site Particle flow maps that take into account offsite pumping are presented in the groundwater modeling pumping. This needs to be presented in CAP. Appendix B of the CAP Part 2. Subsurface drainage systems at dike/dams should be shown and Modeling 61 potential impacts to fate & transport modeling should be Subsurface drainage systems are shown and discussed in Section 4 of the CSA reports. considered. CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments r— �Type Comment Number Comment Guidelines require — seep, sediment, surface water, receptor well General Resolution CAP Part 2 included chem box maps for seeps, sediments, surface water, and groundwater. Chem boxes for Data Presentation 62 data, results show all COIs (field and results) in chem boxes. receptor wells were not able to be shown spatially for all sampling events, however, Figure 1-3 in the CSA Supplement 2 shows location and analytical results. Data Presentation 63 Show concentrations above PQLs on chem box maps, not just Chem box maps show all detected constituents for detection and assessment monitoring constituents as constituents above 2L. part of the CAP Part 2. Data Presentation 64 Add vertical gradients to figures —plan view. CAP Part 1 Section 3 included figures depicting vertical gradients between shallow and deep wells, and between deep and bedrock wells. Data Presentation 65 Add vertical gradient maps. CAP Part 1 Section 3 includes figures depicting vertical gradients between shallow and deep wells, and between deep and bedrock wells. Data Presentation 66 Develop a potentiometric surface map for the transition zone Deep flow layer wells are used to investigate the transition zone, and potentiometric surfaces figures were wells. developed as part of the CAP Part 2 as well as CSA Supplement 2. Piper diagram figures are in Section 10 of the CSA. Updated piper diagrams utilizing Round 5 data have Data Presentation 67 Show cation -anion balance values on Piper diagrams, remove been included in the CSA Supplement 2 to include only those events with balance differences that are less results with balance differences > 10%. than 10%. Show all receptor wells on figures given the existing figure Figure 1-3 in the CSA Supplement 2 presents all receptor wells and their analytical results. Those water Data Presentation 68 supply wells that can be shown in the viewports of the the potentiometric surface and isoconcentration extents. figures in the CSA Supplement 2 are also included. Data Presentation 69 Need one map with all receptor wells and MWs. Figure 1-3 in the CSA Supplement 2 presents all receptor wells and their analytical results. Data Presentation 70 Show seep results with chem boxes. Seeps and DEQ Seeps were provided in CAP Part 1 Section 2 figures. Data Presentation 71 Show topography on groundwater surface contour maps (add Topography has been included on the potentiometric surface figures provided in CSA Supplement 2. elevation labels to contours). Add geologic data and iso-concentration data (include Kds) on Cross -sections will be expanded with additional assessment monitoring wells for the CSA Supplement 2. Data Presentation 72 cross -sections. These will include lithology, recovery, ROD, where available, as well as the vertical extent of COls Data Presentation 73 Add figure showing pH, Eh, etc. results. CAP Part 1 Section 2 Chem Box figures included field parameters. Data Presentation 74 Add table w/NPDES sample event results. A NPDES sample events results table has been provided in Section 1 of the CSA Supplement 2. Data Presentation 75 Chem box figures for groundwater— add round 2 data as column Round 2 chembox figures were included in CAP Part 2. to right of existing data. Iso contours - Need to address how iso contour lines are shown on figures. Show part of the line as dashed where uncertainty exists Data Presentation 76 (i.e., no downgradient data to help determine extent of iso Isoconcentration maps utilizing Round 5 analytical results, including strontium, where it is a COI, are contour). Depict concentrations above reporting limit. included in CSA Supplement 2. Add iso-contour figure for strontium. Need to show natural resource information (i.e., surface water Data Presentation 77 features, wetland features, heron rookery at Buck, etc.) on "base CAP Part 2 Section 2 figures includes wetlands and streams which were delineated by USACE. Other map" figures. natural resources were included on figures as part of the Eco-Checklist referenced in Section 12 of the CSA. Data Presentation 78 Ensure that streams, wetlands, etc. shown in Section 12 are CAP Part 2 Section 2 figures included wetlands and streams as needed. included on all figures as needed. Data Presentation 79 Modify results tables to include field parameters DOs, Eh, spec Field parameters were included on the CAP Part 2 results tables, referenced in Section 2, as well as the CSA conductance, pH, NTU in all results tables. Supplement 2 results tables, referenced in Section 3. Surface, Groundwater Describe SW hydrology (streams, wetlands) in CAP and how CAP Part 2, Section 3 pertains to the Site Conceptual model, and it discusses surface water and seeps in Discharge 80 relates to seeps in CSM. relation to site source areas. Surface, Groundwater Check for alignment of description of streams and wetlands in CAP Part 2, Section 3 pertains to the Site Conceptual model, and it discusses surface water and seeps in Discharge 81 Section 12. relation to site source areas. CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments CSA and CAP site maps include labels of major surface water bodies at each site. In addition, the CSA Surface, Groundwater Discharge 82 Show all surface water features on maps and cross sections. included surface water information in Figure 4-4: Surface Water Bodies. CAP Part 2 included Figure 3-1: Site Conceptual Model, and Figure 3-2: Cross Section with these features. Streamflow measurements have been incorporated into the expanded groundwater model domain Surface, Groundwater Discharge 83 Add wording on stream flow measurements performed. activities. The groundwater models are being updated and recalibrated including new data as it has becoms available and is expected to be completed during Fall 2016. Include non -trespassing recreation users of surface water and In the stand-alone Risk Assessment report, recreational swimmers, boaters, waders, and fishers are Risk Assessment 84 drinking water well receptors. included in the receptors, as are current/future off -site residents. In addition, a separate risk assessment has been provided subsequent to the CSA report by Duke Energy via Haley & Aldritch. Coal ash should be included as primary affected media until it is A separate risk assessment has been provided subsequent to the CSA report by Duke Energy via Haley & Risk Assessment 85 completely removed or otherwise made inaccessible to human Aldritch. contact. Revise Tables 12-1, 12-2, and wording in Section 12. Risk Assessment 86 Expand speciation results discussion with regards to receptors. A separate risk assessment has been provided subsequent to the CSA report by Duke Energy via Haley & Aldritch. Inadequate Data —All Where 2L exceedances intercept rivers/streams implications Vertical hydraulic gradients were calculated for Round 2 data, and were included in CAP Part 1. The Source Areas 87 should be discussed. Discuss vertical gradients for well pairs patterns in vertical gradients are discussed in CAP Part 2 Section 2.3.1.1. adjacent to rivers/streams. Inadequate Data — AII If a MW does not exist between a 2L exceedance and receptor Duke Energy has installed additional monitoring wells to address concerns to refine understanding of 88 (stream and water supply well) additional wells or transport exceedances. Results from the Round 5, including additional assessment wells, has been included in CSA Source Areas modeling is needed to fill data gap. Supplement 2. Inadequate Data —All If uncertainty exists about local flow due to insufficient number or Duke Energy has installed additional monitoring wells to address concerns to refine understanding of 89 placement of wells, then additional wells should be installed. exceedances. Results from the Round 5, including additional assessment wells, has been included in CSA Source Areas Same comment applies for uncertainty on vertical gradients. Supplement 2. CSA Supplement 2 Table 2-2: Total Porosity, Secondary (Effective) Porosity/Specific Yield, and Specific Storage for Lower Hydrostratigraphic Units (TZ and BR) Hydrostratigraphic Unit Secondary (Effective) Porosity / Specific Yield N Total Porosity (%) Specific Storage (1/ft) Transition Zone (TZ) 5.0 - 10.0 5 - 15 1.0E-06 - 2.1 E-05 Bedrock (BR) - Fractured 2.0 - 5.0 5 - 10 < 1.0E-06 Bedrock (BR) - Dense 0-3 0-5 < 1.0E-06 Notes: 1. Ranges based on published values (Domenico and Mifflin, 1965; Singhal and Gupta, 2010). 2. Effective porosity and specific yield are not synonymous. For practical purposes, they may be estimated as approximately equal in value. 3. Table revised 07/14/2016. Riverbend Steam Station CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: A13-1D 3/22/2016 N RV-AB-1D Round 5 AB-1S 3/23/2016 N RV-AB-1S Round 5 A13-2D 3/22/2016 N RV-AB-2D Round 5 AB-2S 3/22/2016 N RV-AB-2S Round 5 AB-3BR 3/23/2016 N RV-AB-3BR Round 5 AB-3D 3/23/2016 N RV-AB-3D Round 5 AB-4D 3/23/2016 N RV-AB-4D Round 5 A13-51D 3/22/2016 N RV -AB -SD Round 5 AB-6BRU 3/22/2016 N RV-AB-6BRU Round 5 AB-6S 3/22/2016 N RV-AB-6S Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit 11 1 Alkalinity, CO3 N Ug/1 307000 5000 U 5000 U 5000 U 51900 374000 15400 5000 U 33000 5000 U Alkalinity, HCO3 N ug/1 11100 1000 J 106000 6800 5000 U 5000 U 39900 204000 50300 45500 Alkalinity, lab N ug/I 318000 1000 J 106000 6800 79800 882000 55300 204000 J+ 83300 45500 Aluminum D ug/1 500 100 U 100 U 100 U 67 J 88 J 100 U 340 650 480 Aluminum T ug/1 598 306 290 84.3 J 122 606 394 1180 723 3130 J+ Antimony D ug/1 3.6 0.15 J 0.14 J 1.9 2.5 2.7 J 0.74 1.1 1.4 0.36 J Antimony T 1 IMAC ug/1 4.2 J 0.72 0.1 J 2.2 2.7 2.3 J 1.6 1.6 1.7 0.4 J Arsenic D -- ug/1 0.2 0.1 U 0.25 0.073 J 0.99 2 U 0.64 0.28 0.2 0.77 Arsenic T 10 02L ug/1 1 U 0.078 J 0.25 0.11 1.1 2 U 0.8 0.55 0.22 0.86 Barium D -- ug/1 41 15 24 21 6.5 370 3.9 J 33 7.7 11 Barium T 700 02L ug/I 49.4 16.8 29 25.1 7.5 396 6.1 39.5 8.2 18.6 Beryllium D -- ug/1 0.1 U 0.1 U 0.1 U 0.1 U 0.014 J 2 U 0.1 U 0.1 U 0.055 J 0.1 U Beryllium T 4 IMAC ug/1 1 U 0.1 U 0.1 U 0.1 U 0.1 U 2 U 0.1 U 0.1 U 0.1 U 0.03 J Boron D -- ug/1 43 J 50 U 390 50 U 50 U 50 U 50 U 170 420 50 U Boron T 700 02L ug/1 43.7 J 50 U 433 50 U 50 U 50 U 50 U 149 462 35.1 J Cadmium D -- ug/1 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 1.6 U 0.08 U 0.08 U 0.08 U 0.08 U Cadmium T 2 02L ug/1 0.8 U 0.08 U 0.08 U 0.08 U 0.08 U 1.6 U 0.08 U 0.08 U 0.08 U 0.08 U Calcium T -- ug/1 87900 628 30100 1100 3150 228000 13700 44500 39000 20000 Carbon N -- ug/1 1100 1000 U 1000 U 22100 910 J 5700 -- 1700 6200 1500 Chloride N 250000 02L ug/I 5200 3800 5500 12500 2100 7800 2000 5000 5500 7900 Chromium D -- ug/1 8.2 0.53 1.6 0.72 0.33 J+ 30.2 2 J+ 1.4 J+ 23.6 0.16 J Chromium T 10 02L ug/1 11.4 1.3 J+ 2.2 J+ 0.9 J+ 0.22 J+ 39.5 2.7 3 J+ 31.8 5.9 Chromium 6+ T 0.07 DHHS ug/1 8.4 0.03 U 1.1 0.012 J 0.025 J+ 34.3 J 1.9 0.96 0.96 0.03 U Cobalt D -- ug/1 0.021 J 14.1 0.16 15.6 0.041 J 2 U 0.012 J 0.016 J 0.59 0.46 Cobalt T 1 IMAC ug/1 0.16 J 14 0.35 16.4 0.034 J+ 2 U 0.23 0.089 J 0.59 3.8 Copper D -- ug/1 1.1 4.1 0.74 1.6 0.54 18.2 0.36 J 0.26 J 2.4 0.22 J Copper T 1000 02L ug/I 5 U 1.1 3.5 1.8 0.3 J 22.1 1.3 0.82 J+ 2 J+ 3 J+ Iron D -- ug/1 50 U 50 U 50 U 43 J 50 U 50 U 50 U 50 U 180 39 J Iron T 300 02L ug/1 28 J 834 258 142 62.8 45.8 J 305 40.9 J 368 4990 Lead D -- ug/1 0.1 U 0.12 0.1 U 0.1 U 0.1 U 2 U 0.1 U 0.1 U 0.1 0.23 Lead T 15 02L ug/I 1 U 0.28 0.1 U 0.11 0.1 U 2 U 0.1 U 0.1 U 0.1 U 1.5 Magnesium T -- ug/1 60.3 J 698 7610 441 54.8 J 100 U 2200 2110 9860 590 Manganese D -- ug/I 5 U 180 45 340 5 U 5 U 5 U 5 U 7.1 180 Manganese T 50 02L ug/1 5 U 193 54.3: 353 5 U 5 U 8.3 5 U 11.1 244 Mercury D -- ug/1 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2J- Mercury T 1 02L ug/1 0.2 U 0.096 J 0.2 U 0.18 J 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Methane N -- ug/1 2.4 J+ 56.4 1.3 J 286 1.7 J+ 4.8 J+ 1.4 J+ 2.4 J+ 1.5 J+ 143 Molybdenum D ug/I 6.6 0.5 U 0.96 0.32 J 3.9 34.1 0.46 J 5.8 2.3 2.6 Molybdenum T ug/I 7.2 0.5 U 0.95 0.35 J 4 34.7 0.63 7.4 2.7 1.8 Nickel D -- ug/1 0.64 4 0.77 2 1.5 10 U 0.5 U 0.5 U 12.7 1 Nickel T 100 02L ug/I 5 U 3.3 1 2 0.5 U 10 U 0.75 1.1 18.8 2.6 Nitrogen, NO2 plus NO3 N -- ug/I 15 J 760 200 310 20 U 53 570 130 29 20 U Potassium T ug/1 62400 5000 U 5000 U 5000 U 30000 150000 6050 70100 16500 5000 U Selenium D -- ug/I 0.59 0.5 U 0.5 U 0.53 13.7 10 U 0.5 U 0.5 U 0.5 U 0.39 J Selenium T 20 02L ug/I 5 U 0.5 U 0.5 U 0.55 14.9 10 U 0.5 U 0.5 U 0.5 U 0.75 Sodium T -- ug/I 20900 5000 U 10400 25800 24000 111000 7840 31700 11000 7980 Strontium D Ug/1 450 6.1 170 11 170 5900 120 440 270 97 Strontium T -- Ug/1 525 6.5 183 12.8 195 6320 146 529 308 121 Sulfate N 250000 02L Ug/1 31100 750J 15900 37400 14800 120000 7100 62000 95700 16100 Sulfide N -- Ug/1 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- Ug/1 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 2 U 0.1 U 0.1 U 0.1 U 0.028 J Thallium T 0.2 IMAC Ug/1 1 U 0.1 U 0.1 U 0.037 J 0.1 U 2 U 0.1 U 0.1 U 0.1 U 0.055 J Total Dissolved Solids N 500000 02L Ug/1 366000 25000 U 180000 93000 129000 950000 112000 311000 210000 97000 Total Organic Carbon N -- ug/I -- -- -- -- -- -- 1000 U -- -- -- Total Suspended Solids N ug/I 25000 U 20400 5100 40000 3400 17000 3200 17100 21400 23800 Uranium, Natural T ug/1 -- -- -- -- -- -- -- -- -- -- Vanadium D -- ug/1 9.3 0.12 J 5.8 0.3 U 14.8 7.7 16 11.6 10.5 5.9 Vanadium T 0.3 IMAC ug/1 10 1.9 6.2 0.26 J 15.8 8.7 17.5 12.6 10.2 22 Riverbend Steam Station 1 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: AB-1D 3/22/2016 N RV-AB-1D Round 5 AB-1S 3/23/2016 N RV-AB-1S Round 5 AB-2D 3/22/2016 N RV-AB-2D Round 5 AB-2S 3/22/2016 N RV-AB-2S Round 5 AB-3BR 3/23/2016 N RV-AB-3BR Round 5 AB-3D 3/23/2016 N RV-AB-3D Round 5 AB-4D 3/23/2016 N RV-AB-4D Round 5 AB-5D 3/22/2016 N RV -AB -SD Round 5 AB-6BRU 3/22/2016 N RV-AB-6BRU Round 5 AB-6S 3/22/2016 N RV-AB-6S Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Zinc D -- ug/1 81 22 10U 25 1ou 10U 10U 101-1 10U 10U Zinc T 1000 02L ug/1 2.6 J 18.6 10 U 16.2 2.9 J 4.1 J 4.4 J 10 U 2.9 J 22.1 Dissolved Oxygen N -- mg/I 0.3 0.4 0.8 0.3 0.6 0.6 2.1 0.4 0.21 0.08 Oxidation Reduction Potential N mV -106.8 231.9 57.8 308.1 -162.6 -138.1 74.7 -174.1 47 13.6 pH N 6.5 - 8.5 02L SU 12.2 5 7.2 5 10.8 12.3 9.3 11.9 9.8 9 Specific Conductivity N PS/cm 1695 28 271.4 161.4 308.3 4060 150.1 1308 361.9 153.5 Temperature N Deg C 16.3 21.5 17 17.8 20.9 19.5 19.8 19 18.5 20.4 Turbidity, field N I I NTU 6.4 1 13.12 9.84 1 14.8 1 1.67 1 9.25 1 9.1 7 1 42.34 1 105.4 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter mV = millivolts NTU - nephelometric turbidity units pCi/L = 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 .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 Riverbend Steam Station 2 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: A13-7D 3/22/2016 N RV-AB-7D Round 5 AB-71 3/22/2016 N RV-AB-71 Round 5 A13-8D 3/22/2016 N RV -AB -BD Round 5 AB-8S 3/22/2016 N RV-AB-BS Round 5 BG-1D 3/14/2016 N RV-BG-1D Round 5 BG-1S 3/14/2016 N RV-BG-1S Round 5 BG-2BR 3/14/2016 N RV-BG-2BR Round 5 BG-2D 3/14/2016 N RV-BG-2D Round 5 BG-2S 3/14/2016 N RV-BG-2S Round 5 BG-3D 3/14/2016 N RV-BG-3D Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit -9w- low: Alkalinity, CO3 N ug/1 77200 5000 U 5000 U 5000 U 216000 5000 U 5000 U 98600 5000 U 5000 U Alkalinity, HCO3 N ug/1 15900 7500 49100 5000 J 5000 U 5500 99900 5000 U 30400 34500 Alkalinity, lab N ug/1 93100 7500 49100 5000 J 324000 5500 99900 114000 30400 34500 Aluminum D ug/1 750 100 U 150 100 U 430 100 U 100 U 100 U 100 U 100 U Aluminum T ug/1 876 647 228 73.6 J 455 100 U 54.3 J 331 100 U 100 U Antimony D -- ug/1 0.62 0.35 J 0.5 U 0.5 U 1.1 0.5 U 0.5 U 2.1 0.7 0.5 U Antimony T 1 IMAC ug/1 1.1 0.32 J 0.5 U 0.5 U 0.98 0.5 U 0.5 U 2.1 0.44 J 0.5 U Arsenic D -- ug/1 2.6 0.55 0.076 J 0.1 U 0.55 0.1 U 0.5 1.4 0.041 J 0.058 J Arsenic T 10 02L ug/1 2.9 0.81 0.091 J 0.044 J 0.48 0.1 U 0.49 1.6 0.055 J 0.075 J Barium D -- ug/1 17 29 41 84 290 18 10 5 U 140 14 Barium T 700 02L ug/I 20.6 40.4 45.2 91.9 283 17.2 9.6 13.9 127 12.1 Beryllium D -- ug/1 0.032 J 0.02 J 0.1 U 0.32 0.1 U 0.1 U 0.1 U 0.1 U 0.1 J+ 0.1 U Beryllium T 4 IMAC ug/1 0.1 U 0.038 J 0.1 U 0.56 0.042 J+ 0.099 J+ 0.043 J+ 0.025 J+ 0.16 J+ 0.022 J+ Boron D -- ug/1 50 U 50 U 400 170 50 U 50 U 50 U 50 U 50 U 50 U Boron T 700 02L ug/I 38.2 J 50 U 432 175 50 U 50 U 50 U 50 U 50 U 50 U Cadmium D -- ug/I 0.08 U 0.08 U 0.08 U 0.13 J+ 0.08 U 0.08 U 0.08 U 0.08 U 0.053 J 0.08 U Cadmium T 2 02L ug/I 0.08 U 0.08 U 0.08 U 0.15 0.08 U 0.08 U 0.08 U 0.08 U 0.068 J 0.08 U Calcium T -- ug/1 27700 1760 46000 17700 47500 588 26700 28000 19600 7980 Carbon N -- ug/I 1000 U 1000 U 1000 U 1000 U -- -- -- -- -- -- Chloride N 250000 02L ug/I 3200 2000 5700 5200 2700 1400 3400 9500 12400 3000 Chromium D -- ug/I 22.3 0.63 J+ 1 J+ 3.7 J+ 0.65 J+ 0.38 J+ 0.38 J+ 4.4 0.46 J+ 0.34 J+ Chromium T 10 02L ug/1 20.1 2.5 J+ 1.2 J+ 4 1.2 J+ 0.33 J+ 0.35 J+ 4.9 0.5 J+ 0.38 J+ Chromium 6+ T 0.07 DHHS ug/1 17.4 J 0.3 0.054 3.7 0.018 J- 0.03 U 0.029 J 3.7 0.17 0.049 Cobalt D -- ug/1 0.41 0.65 0.51 0.22 J+ 0.64 0.48 0.39 0.041 J+ 0.24 0.24 Cobalt T 1 IMAC ug/1 0.14 J+ 1.3 0.54 0.25 0.61 0.42 0.52 0.04 J+ 0.22 0.79 Copper D -- ug/I 5 0.4 J+ 0.45 J+ 1.6 J+ 0.27 J+ 1.8 J+ 0.2 J+ 1.4 J+ 3.3 0.58 J+ Copper T 1000 02L ug/I 2 0.71 0.73 J+ 0.51 J+ 0.81 0.44 J 0.32 J 1.6 8 0.17 J Iron D -- ug/1 170 50 U 170 50 U 50 U 50 U 36 J 50 U 50 U 50 U Iron T 300 02L ug/1 163 670 300 59.8 35.5 J 50 U 113 50 U 26.2 J 50 U Lead D -- ug/1 0.19 0.1 U 0.1 U 0.1 U 0.09 J 0.14 0.1 U 0.1 U 0.1 U 0.1 U Lead T 15 02L ug/I 0.1U 0.21 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U Magnesium T -- ug/I 161 767 11800 11000 100 U 1080 3320 347 3840 1890 Manganese D -- ug/I 11 76 91 130 5 U 42 12 5 U 340 5 U Manganese T 50 02L ug/1 12.2 119 102 147 5 U 38.7 10.6 5 U 318 6.2 Mercury D -- ug/1 0.2 U 0.2 U 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 T 1 02L ug/I 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Methane N -- ug/I 1.8 J+ 1.6 J+ 1.9 J+ 1.7 J+ 3.8 J+ 2 J+ 6.7 J+ 2.1 J+ 22.7 1.9 J+ Molybdenum D ug/I 4.4 0.5 U 0.32 J 0.5 U 14.4 0.5 U 17.9 3.4 0.18 J 1 Molybdenum T ug/I 5.6 0.5 U 0.31 J 0.5 U 13 0.5 U 17.3 3.3 0.23 J 0.84 Nickel D -- ug/I 5 0.98 1.2 J+ 1.3 J+ 0.66 0.78 1 0.76 0.65 0.5 U Nickel T 100 02L ug/I 2.6 1.9 1.1 1.6 0.7 0.6 0.98 0.5 U 0.56 0.5 U Nitrogen, NO2 plus NO3 N -- ug/I 54 J+ 110 J+ 24 390 20 U 100 20 U 1500 10000 1900 Potassium T ug/I 6010 5000 U 2800 J 5000 U 86900 5000 U 3000 J 6010 5000 U 5000 U Selenium D -- ug/I 0.43 J 0.5 U 0.5 U 1.6 0.55 0.5 U 0.5 U 1.2 0.5 U 0.5 U Selenium T 20 02L ug/I 0.46 J 0.5 U 0.33 J 1.7 0.43 J 0.5 U 0.5 U 1.3 0.5 U 0.36 J Sodium T -- ug/I 26900 7360 13200 9140 51900 5000 U 13700 37200 9090 7750 Strontium D ug/I 160 28 440 310 2800 8 150 5 U 190 62 Strontium T -- ug/1 207 33.3 469 307 3020 8 166 192 201 70.3 Sulfate N 250000 02L ug/I 34300 12000 129000 97600 31700 760 J 12600 36300 1700 1400 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 UJ 100 U 100 U Thallium D -- ug/I 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U Thallium T 0.2 IMAC ug/1 0.1 U 0.035 J+ 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 147000 34000 295000 167000 414000 25000 U 156000 219000 J+ 142000 J+ 90000 J+ Total Organic Carbon N -- ug/I -- -- -- -- 5600 1000 U 1300 4500 1000 U 1000 U Total Suspended Solids N ug/1 54200 18000 2800 2500 U 2500 U 2500 U 2500 U 5900 2500 U 2500 U Uranium, Natural T ug/1 -- -- -- 0.5 U 0.5 U 1.1 0.24 J 0.5 U 1 0.5 U Vanadium D ug/1 34.4 0.076 J 1.3 0.076 J 2.3 0.3 U 1.3 22.3 0.075 J 2.5 Vanadium I T 1 0.3 1 IMAC I ug/I 1 38.2 1 0.94 1.5 0.2 J 2.2 0.3 U 1.2 20.7 0.097 J 2.1 Riverbend Steam Station 3 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: AB-7D 3/22/2016 N RV-AB-7D Round 5 AB-71 3/22/2016 N RV-AB-71 Round 5 AB-8D 3/22/2016 N RV -AB -BD Round 5 AB-8S 3/22/2016 N RV-AB-8S Round 5 BG-1D 3/14/2016 N RV-BG-1D Round 5 BG-1S 3/14/2016 N RV-BG-1S Round 5 BG-2BR 3/14/2016 N RV-BG-2BR Round 5 BG-2D 3/14/2016 N RV-BG-2D Round 5 BG-2S 3/14/2016 N RV-BG-2S Round 5 BG-3D 3/14/2016 N RV-BG-3D Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Zinc D -- ug/I 2.7 J+ 8 J+ 4.2 J 9.7 J 10 U 7.9 J 10 U 8.8 J 16 10 U Zinc T 1000 02L ug/I 10 U 12.4 10 U 8.1 J 10 U 7.4 J 10 U 3.2 J 12.4 2.6 J Dissolved Oxygen N -- mg/I 5.7 1.4 0.4 4.3 0.2 6.9 0.3 1.56 3.69 4.07 Oxidation Reduction Potential N mV 91.7 234.2 42.5 292.8 -209.4 191.1 -74.1 8.6 173.3 167.7 pH N 6.5 - 8.5 02L SU 10.7 5.7 6 4.9 12.2 5.5 7.8 11.14 5.97 6.55 Specific Conductivity N PS/cm 305.6 62.1 436.5 259.2 1492 20.8 218.2 452 162.8 91.3 Temperature N Deg C 18.8 19 15.6 16.4 16.5 15.7 16.3 17.2 21.2 17.2 Turbidity, field N I I NTU 9.8 1 9.4 8.3 7.1 2.5 1 3.5 7.07 9.39 1.16 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter mV = millivolts NTU - nephelometric turbidity units pCi/L = 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 .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 Riverbend Steam Station 4 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: BG-3D 3/14/2016 FD RV-BG-3D-FD Round 5 BG-3S 3/14/2016 N RV-BG-3S Round 5 BG-5BR 4/22/2016 N RV-BG-5BR Round 5 C-21D 3/23/2016 N RV-C-2D Round 5 C-2S 3/23/2016 N RV-C-2S Round 5 GWA-10BRU 3/22/2016 N RV-GWA-10BRU Round 5 GWA-10S 3/22/2016 N RV-GWA-10S Round 5 GWA-11D 2/25/2016 N RV-GWA-11D Round 5 GWA-11S 2/23/2016 N RV-GWA-11S Round 5 GWA-12D 2/19/2016 N GWA-12D Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Alkalinity, CO3 N Ug/1 5000 U 5000 U 5000 U 5000 U 5000 U 275000 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N Ug/1 34300 34900 119000 120000 5000 U 5000 U 4100 J 66800 104000 29700 Alkalinity, lab N ug/1 34300 34900 119000 120000 5000 U 320000 4100 J 66800 104000 29700 Aluminum D ug/1 100 U 100 U 100 U 100 U 1400 820 100 U 54 J 100 U 100 U Aluminum T ug/1 100 U 50.8 J 83.3 J 100 U 1560 1080 74.9 J 200 170 110 Antimony D -- ug/1 0.5 U 0.5 U 2.4 0.31 J 0.5 U 1.2 J 0.5 U 10 U 0.5 U 0.3 J Antimony T 1 IMAC ug/1 0.5 U 0.5 U 1.4 0.35 J 0.5 U 1.5 J 0.5 U 10 U 0.5 0.35 J Arsenic D -- ug/1 0.063 J 0.25 0.42 0.8 1 1 U 0.041 J 2 U 0.28 0.46 Arsenic T 10 02L ug/1 0.06 J 0.3 0.37 0.74 0.96 0.4 J 0.057 J 2 U 0.32 0.61 Barium D -- ug/1 14 37 129 24 33 80 28 65 54 44 Barium T 700 02L ug/I 12.8 36 145 27.4 35.4 84.9 31.1 66 62 50 Beryllium D -- ug/1 0.032 J 0.046 J+ 0.1 U 0.1 U 2 1 U 0.14 1.3 J 0.1 U 0.1 U Beryllium T 4 IMAC ug/1 0.031 J+ 0.03 J+ 0.1 U 0.1 U 2.1 1 U 0.11 2.1 0.1 U 0.1 U Boron D -- ug/1 50 U 50 U 50 U 50 U 160 120 150 50 U 50 U 65 Boron T 700 02L ug/I 50 U 50 U 50 U 50 U 172 117 160 26 J 50 U 65 Cadmium D -- ug/I 0.08 U 0.08 U 0.08 U 0.08 U 0.19 0.8 U 0.08 U 1.6 U 0.08 U 0.061 J Cadmium T 2 02L ug/I 0.08 U 0.082 0.08 U 0.08 U 0.2 0.8 U 0.08 U 1.6 U 0.08 U 0.056 J Calcium T -- ug/1 8860 7120 39700 31800 10500 42500 4740 410000 28600 107000 Carbon N -- ug/I -- -- -- 1000 U -- 3300 11900 -- -- -- Chloride N 250000 02L ug/I 2900 2800 14500 2500 3100 4600 6300 19100 6000 3600 Chromium D -- ug/I 0.48 J+ 0.32 J+ 0.76 J+ 1.5 0.34 J+ 5 U 0.25 J 10 U 0.52 0.53 Chromium T 10 02L ug/1 0.36 J+ 0.56 J+ 1.2 J+ 1.6 J+ 0.48 J+ 5 UJ 0.5 J+ 10 U 3.4 0.48 J+ Chromium 6+ T 0.07 DHHS ug/1 0.044 0.019 J 0.17 13 0.11 J+ 0.03 U 0.14 0.076 J+ 0.03 U 0.03 U Cobalt D -- ug/1 0.24 0.81 0.076 J 0.028 J 38.6 1 U 10.5 9.7 6.6 11.2 Cobalt T 1 IMAC ug/1 0.28 0.75 0.09 J 0.028 J+ 39.4 1 U 10.6 10.5 5.9 9.3 J Copper D -- ug/I 0.96 J+ 0.37 J+ 0.5 J 0.37 J 10.7 5 U 1.2 19.2 2.6 1.3 Copper T 1000 02L ug/I 0.5 U 0.13 J 0.43 J+ 0.64 J+ 6.3 5 U 0.44 J 45.5 0.78 0.21 J+ Iron D -- ug/1 50 U 730 50 U 50 U 50 U 50 U 330 91 50 U 1300 Iron T 300 02L ug/1 50 U 1090 41.2 J 25.8 J 70 50 U 446 270 1300 1100 Lead D -- ug/1 0.093 J 0.1 U 0.1 U 0.1 U 0.16 1 U 0.1 U 2 U 0.29 0.13 Lead T 15 02L ug/I 0.1 U 0.1 U 0.1 U 0.1 U 0.17 1 U 0.1 U 2 U 0.29 0.1 U Magnesium T -- ug/I 2010 920 6600 3940 3980 446 5940 104000 10800 35200 Manganese D -- ug/I 5 U 470 10.4 2.8 J 500 5 U 230 76 5 U 2300 Manganese T 50 02L ug/1 2.8 J 434 13.1 3.7 J 546 5 U 233 81 4800 2300 Mercury D -- ug/1 0.2 U 0.2 U 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 T 1 02L ug/I 0.2U 0.2U 0.2U 0.2U 0.21 0.2U 0.2U 0.2U 0.2U 0.2U Methane N -- ug/I 1.7 J+ 42.4 10 U 1.5 J+ 4.2 J+ 3.8 J+ 1.6 J+ 2.2 J+ 61.4 2.4 J+ Molybdenum D ug/I 1.1 0.17 J 2.5 0.51 0.5 U 1.9 J 0.5 U 3.4 J 1.4 6.3 Molybdenum T ug/I 0.86 0.15 J 2.3 0.51 0.5 U 2.1 0.5 U 3.4 J 1.4 7.6 J Nickel D -- ug/I 1.6 0.79 0.5 U 1.5 22.5 5 U 1.3 10 U 3.8 39.2 Nickel T 100 02L ug/I 0.5 U 1.1 0.6 0.76 22.4 5 U 1.2 10 U 4.7 38.6 Nitrogen, NO2 plus NO3 N -- ug/I 1900 20 U 20 U 15.1 3300 20 U 20 U 66 20 U 860 Potassium T ug/I 5000 U 5000 U 5740 5000 U 7970 114000 5000 U 9530 5000 U 7180 Selenium D -- ug/I 0.5 U 0.5 U 0.52 0.5 U 12.2 5 U 0.5 U 10 U 0.5 U 2.7 Selenium T 20 02L ug/I 0.5 U 0.5 U 0.57 0.5 U 11.9 5 U 0.5 U 6.5 J 0.52 2.3 Sodium T -- ug/I 7830 6470 16200 11600 3910J 39200 4420J 31800 11900 27400 Strontium D ug/I 62 68 782 180 460 920 58 1900 450 800 Strontium T -- ug/1 73.6 72.9 892 204 492 940 62.5 1800 600 890 Sulfate N 250000 02L ug/I 1400 1900 26400 2200 60000 20400 34200 1550000 75600 429000 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.1 U 0.1 U 0.1 U 0.1 U 0.064 J 1 U 0.1 U 2 U 0.1 U 0.1 U Thallium T 0.2 IMAC ug/1 0.1 U 0.1 U 0.1 U 0.1 U 0.065 J 1 U 0.1 U 1 J 0.1 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 83000 J+ 78000 197000 138000 141000 336000 J+ 77000 J+ 3240000 317000 J+ 748000 Total Organic Carbon N -- ug/I 1000 U 1000 U 1000 U -- 1000 U -- -- 1000 U 1100 1000 U Total Suspended Solids N I ug/1 2600 U 2500 U 2500 U 2500 U 5000 U 8300 2700 5000 U 28400 3100 Uranium, Natural T I ug/I 1 0.5 U 0.5 U -- -- 5 U 5 U -- -- -- Vanadium D I -- I ug/I 1 2.5 0.15 J 1 1.3 1 5.8 0.3 U 4.7 0.078 J 10 U 0.5 U 0.49 J Vanadium I T 1 0.3 1 IMAC I ug/I 1 ? 1 0.17 J 1 1.2 1 5.8 1 0.16 J 1 5.2 1 0.27 J 1 10 U 1 2 0.65 Riverbend Steam Station 5 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: BG-3D 3/14/2016 FD RV-BG-3D-FD Round 5 BG-3S 3/14/2016 N RV-BG-3S Round 5 BG-5BR 4/22/2016 N RV-BG-5BR Round 5 C-21D 3/23/2016 N RV-C-2D Round 5 C-2S 3/23/2016 N RV-C-2S Round 5 GWA-10BRU 3/22/2016 N RV-GWA-10BRU Round 5 GWA-10S 3/22/2016 N RV-GWA-10S Round 5 GWA-11D 2/25/2016 N RV-GWA-11D Round 5 GWA-11S 2/23/2016 N RV-GWA-11S Round 5 GWA-12D 2/19/2016 N GWA-12D Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Zinc D -- ug/I 10 U 4.8 J 3.7 J+ 8.8 J 49 10 U 12 14 10 16 Zinc T 1000 02L ug/I 10 U 5.1 J 10.5 J+ 25.1 52.2 10 U 9 J 25 10 U 11 J+ Dissolved Oxygen N -- mg/I 4.07 1.5 0.2 1.7 0.6 0.4 0.5 3.36 0.55 0.19 Oxidation Reduction Potential N mV 167.7 -15 -98.8 102.8 520.7 -206 171 107.4 -62.6 10.1 pH N 6.5 - 8.5 02L SU 6.55 6.1 7.9 7.8 3.9 11.8 5.1 6.7 6.2 6.1 Specific Conductivity N PS/cm 91.3 80.8 204.8 238.3 221.5 1680 120 2306 333.5 879 Temperature N Deg C 17.2 15.7 18.1 22.2 19.6 15 15 18.7 16.4 12.9 Turbidity, field N I I NTU 1.16 1 3.2 5.4 8 8 8 8 7.34 3.8 0.09 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter mV = millivolts NTU - nephelometric turbidity units pCi/L = 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 .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 Riverbend Steam Station 6 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: GWA-12D 2/19/2016 FD GWA-12D DUP Round 5 GWA-12S 2/26/2016 N RV-GWA-12S Round 5 GWA-14S 3/1/2016 N RV-GWA-14S Round 5 GWA-1BRU 3/22/2016 N RV-GWA-1BRU Round 5 GWA-1S 3/23/2016 N RV-GWA-1S Round 5 GWA-20BR 3/24/2016 N RV-GWA-20BR Round 5 GWA-20BR 3/24/2016 FD RV-GWA-20BR-FD Round 5 GWA-20D 3/24/2016 N RV-GWA-20D Round 5 GWA-20S 3/22/2016 N RV-GWA-20S Round 5 GWA-21BR 3/24/2016 N RV-GWA-21BR Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit IT Alkalinity, CO3 N ug/1 5000 U 5000 U 5000 U 5000 U 5000 U 77000 69200 2260000 5000 U 426000 Alkalinity, HCO3 N ug/1 31000 5000 U 5500 64800 28900 141000 5000 U 238000 3400 J 80100 Alkalinity, lab N ug/1 31000 5000 U 5500 64800 28900 218000 245000 2500000 J+ 3400 J 506000 Aluminum D ug/1 100 U 520 100 U 54 J 100 U 100 U 100 U 88 J 100 U 170 Aluminum T ug/1 110 730 100 U 157 341 79.7 J 933 J 113 75.5 J 207 Antimony D -- ug/1 0.28 J 0.1 J 0.48 J 0.5 U 0.5 U 13.7 14.3 10 U 0.21 J 1.4 J Antimony T 1 IMAC ug/1 0.23 J 0.2 J 0.48 J 0.5 U 0.5 U 15 13.3 10 U 0.26 J 1.3 J Arsenic D -- ug/1 0.49 0.24 0.11 0.27 0.05 J 1 U 1 U 2 U 0.048 J 1 U Arsenic T 10 02L ug/1 0.36 0.24 0.12 0.22 0.062 J 1 U 0.45 J 2 U 0.089 J 1 U Barium D -- ug/1 45 120 12 3.5 J 30 180 170 250 13 310 Barium T 700 02L ug/I 50 140 15 4.5 J 35.5 199 J 151 J 298 15.3 365 Beryllium D -- ug/1 0.1 U 3.7 0.18 0.1 U 0.1 U 1 U 1 U 2 U 0.028 J 1 U Beryllium T 4 IMAC ug/1 0.1 U &S 0.13 J+ 0.1 U 0.1 U 1 U 0.4 J 2 U 0.028 J 1 U Boron D -- ug/1 64 87 50 U 50 U 46 J 50 U 50 U 50 U 50 U 50 U Boron T 700 02L ug/I 62 93 50 U 50 U 53.2 50 U 479 50 U 50 U 50 U Cadmium D -- ug/I 0.053 J 0.73 0.08 U 0.08 U 0.08 U 0.8 U 0.8 U 1.6 U 0.08 U 0.8 U Cadmium T 2 02L ug/I 0.072 J 0.93 0.08 U 0.08 U 0.08 U 0.8 U 0.8 U 1.6 U 0.08 U 0.8 U Calcium T -- ug/1 111000 54000 1310 18300 5700 39200 40900 733000 1090 83000 J- Carbon N -- ug/I -- -- -- 7900 -- 700 J 770 J 15000 1000 U 7800 Chloride N 250000 02L ug/I 3700 2600 2800 2200 5600 2900 2900 14300 9100 4100 Chromium D -- ug/I 0.53 3.9 0.14 J+ 0.22 J+ 4.6 12.9 13.2 144 0.58 J+ 1.4 J+ Chromium T 10 02L ug/1 0.64 J+ 7.9 0.36 J+ 0.47 J+ 4.2 41.4 39.6 160 0.48 J+ 6.9 Chromium 6+ T 0.07 DHHS ug/1 0.03 U 3.9 0.03 U 3 UJ 2.4 12.4 J 10.8 J 0.29 0.014 J 0.34 Cobalt D -- ug/1 11.2 49.4 2 0.097 J+ 0.26 1 U 1 U 0.32 J 1.3 0.14 J Cobalt T 1 IMAC ug/1 11.5 J 50.5 2 0.17 0.28 0.82 J+ 0.81 J+ 0.64 J 1.3 0.22 J Copper D -- ug/I 0.65 8.2 11.6 1 J+ 1.3 1.1 J+ 5 U 6.5 J 2.7 5 U Copper T 1000 02L ug/I 0.49 J+ 9.5 13.2 4.1 1.5 2 J+ 2.8 J+ 5.3 J 1.1 1.2 J Iron D -- ug/1 1300 130 50 U 50 51 190 50 U 50 U 50 U 50 U Iron T 300 02L ug/1 1300 380 45 J 135 343 141 J 534 J 50 U 93.9 72.5 Lead D -- ug/1 0.1 U 0.22 0.1 U 0.1 U 0.1 U 1 U 1 U 4.8 0.1 U 1 U Lead T 15 02L ug/I 0.1 U 0.12 0.1 U 0.097 J 0.1 U 2.3 2.6 4 0.1 U 1 U Magnesium T -- ug/I 35300 19300 398 3390 2950 158 185 100 U 1110 111 Manganese D -- ug/I 2300 3400 91 20 4.8 J 5 U 5 U 5 U 48 5 U Manganese T 50 02L ug/1 2300 3600 84 28.9 14.4 5 U 23.9 5 U 53.2 3.7 J Mercury D -- ug/1 0.2 U 0.2 U 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 T 1 02L ug/I 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Methane N -- ug/I 2.3 J+ 7.2 J+ 2 J+ 1.9 J+ 1.5 J+ 4.3 J+ 3.6 J+ 5.3 J+ 1.6 J+ 24 Molybdenum D ug/I 6.3 0.23 J 0.5 U 7.6 0.14 J 13 13.4 72 0.5 U 7.1 Molybdenum T ug/I 5 J 0.21 J 0.5 U 8.2 0.13 J 14.2 12.9 68.9 0.5 U 6.5 Nickel D -- ug/I 38.8 84.2 1.3 0.5 U 1.7 5 U 5 U 10 U 1.4 5 U Nickel T 100 02L ug/I 40.2 89 1.3 0.49 J 1.6 19.1 J+ 18.2 J+ 15.9 1.4 5 U Nitrogen, NO2 plus NO3 N -- ug/I 780 550 20 U 20 U 140 20 U 20 U 20 U 20 U 20 U Potassium T ug/I 7220 4630 J 5000 U 2820 J 5000 U 80200 79800 580000 5000 U 70200 J- Selenium D -- ug/I 2.5 4.1 0.5 U 0.5 U 0.5 U 5 U 5 U 10 U 0.5 U 5 U Selenium T 20 02L ug/I 2.6 4.4 0.5 U 0.5 U 0.5 U 5 U 5 U 8.6 J 0.5 U 5 U Sodium T -- ug/I 23400 11400 3020 J 6380 5130 31200 31100 155000 4230 J 87900 J- Strontium D ug/I 800 980 11 80 65 1700 1500 7500 J- 12 1900 Strontium T -- ug/I 890 1200 12 86.4 72.2 1840 J 607 J 9150 12.6 2250 Sulfate N 250000 02L ug/I 427000 239000 2100 J+ 11000 1400 19900 19900 9900 780 J 9300 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.1 U 0.015 J 0.023 J 0.1 U 0.1 U 1 U 1 U 2.6 0.1 U 1 U Thallium T 0.2 IMAC ug/I 0.1 U 0.018 J 0.1 U 0.1 U 0.1 U 1 U 1 U 2.4 0.1 U 1 U Total Dissolved Solids N 500000 02L ug/I 759000 385000 39000 J+ 116000 74000 261000 263000 3120000 32000 1340000 Total Organic Carbon N -- ug/I 1000 U 590 J 39000 -- 1000 U -- -- -- -- -- Total Suspended Solids N ug/I 2600 3200 2500 U 3400 7100 14500 J 250000 J 10100 5000 U 10000 Uranium, Natural T ug/1 -- -- -- 0.41 J 0.16 J -- -- -- -- -- Vanadium D -- ug/1 0.46 J 0.17 J 0.3 U 1.1 1.7 3.6 4 6 U 0.3 U 3 J Vanadium T 0.3 IMAC ug/1 0.55 0.73 0.0911 1 2.2 4.2 J+ 4 J+ 6 U 0.19 J 2.7 J Riverbend Steam Station 7 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: GWA-12D 2/19/2016 FD GWA-12D DUP Round 5 GWA-12S 2/26/2016 N RV-GWA-12S Round 5 GWA-14S 3/1/2016 N RV-GWA-14S Round 5 GWA-1BRU 3/22/2016 N RV-GWA-1BRU Round 5 GWA-1S 3/23/2016 N RV-GWA-1S Round 5 GWA-20BR 3/24/2016 N RV-GWA-20BR Round 5 GWA-20BR 3/24/2016 FD RV-GWA-20BR-FD Round 5 GWA-20D 3/24/2016 N RV-GWA-20D Round 5 GWA-20S 3/22/2016 N RV-GWA-20S Round 5 GWA-21BR 3/24/2016 N RV-GWA-21BR Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Zinc D -- ug/I 32 110 23 10 U 11 10 U 3.1 J 47 11 8.5 J Zinc T 1000 02L ug/I 13 J+ 130 33 12.5 16.1 9.1 J 16.6 J 38.8 13.9 J+ 16.2 Dissolved Oxygen N -- mg/I 0.19 4.39 7.5 1.1 4.1 2.08 2.08 3.5 6.64 0.8 Oxidation Reduction Potential N mV 10.1 139.9 177.3 -85.1 188.7 14.9 14.9 -108.1 266.3 -105.5 pH N 6.5 - 8.5 02L SU 6.1 5 5.8 8.5 5.8 10.5 10.5 12.8 5.1 13 Specific Conductivity N PS/cm 879 489.3 27.6 168.9 88.7 1011 1011 11738 33.7 1700 Temperature N Deg C 12.9 13.1 16.6 18.6 20.7 20 20 18.5 15.1 16.8 Turbidity, field N I I NTU 0.09 1 8.33 1.9 5.8 9.5 10 1 10 8.42 7.1 3.8 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter mV = millivolts NTU - nephelometric turbidity units pCi/L = 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 .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 Riverbend Steam Station 8 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: GWA-21D 3/24/2016 N RV-GWA-21D Round 5 GWA-21S 3/24/2016 N RV-GWA-21S Round 5 GWA-22BR-A 3/23/2016 N RV-GWA-22BR Round 5 GWA-22D 3/23/2016 N RV-GWA-22D Round 5 GWA-22S 3/23/2016 N RV-GWA-22S Round 5 GWA-23BR 3/23/2016 N RV-GWA-23BR Round 5 GWA-23D 3/23/2016 N RV-GWA-23D Round 5 GWA-23D 3/23/2016 FD RV-FD-GWA-23D Round 5 GWA-23S 3/22/2016 N RV-GWA-23S Round 5 GWA-23S 3/22/2016 FD RV-FD-GWA-23S Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit IF Alkalinity, CO3 N Ug/1 5000 U 5000 U 5400 5000 U 5000 U 480000 95900 101000 5000 U 5000 U Alkalinity, HCO3 N Ug/1 78000 5000 U 53000 33900 2200 J 5000 U 5000 U 5000 U 5800 J 7900 J Alkalinity, lab N Ug/1 78000 5000 U 58400 33900 2200 J 544000 115000 119000 5800 J 7900 J Aluminum D Ug/1 460 100 U 100 U 100 U 100 U 140 280 280 60 J 58 J Aluminum T Ug/1 9210 64.2 J 106 430 51.4 J 213 337 341 78.4 J 67.8 J Antimony D -- Ug/1 0.12 J 0.1 J 0.63 0.5 U 0.5 U 2.1 J 0.54 0.54 0.11 J 0.11 J Antimony T 1 IMAC Ug/1 0.39 J 0.11 J 0.7 0.16 J 0.5 U 2 J 0.57 0.56 0.5 U 0.5 U Arsenic D -- Ug/1 0.22 0.1 U 1.2 0.089 J 0.17 1 U 0.7 0.7 0.062 J 0.053 J Arsenic T 10 02L ug/1 0.35 0.1 U 1.3 0.11 0.17 1 U 0.77 0.74 0.061 J 0.063 J Barium D -- ug/1 9.7 55 4.4 J 20 29 230 41 41 36 36 Barium T 700 02L ug/I 34.4 65.8 5.6 30.4 33.8 237 44.8 46 38.6 39.3 Beryllium D -- ug/1 0.04 J 0.1 U 0.1 U 0.1 U 0.1 U 1 U 0.1 U 0.1 U 0.032 J 0.024 J Beryllium T 4 IMAC ug/1 0.04 J 0.1 U 0.1 U 0.055 J 0.013 J+ 0.28 J 0.1 U 0.1 U 0.065 J 0.02 J Boron D -- ug/1 50 U 50 U 42 J 50 U 50 U 50 U 50 U 50 U 50 U 50 U Boron T 700 02L ug/I 50 U 50 U 46.4 J 50 U 50 U 50 U 50 U 50 U 50 U 50 U Cadmium D -- ug/I 0.08 U 0.08 U 0.067 J 0.08 U 0.053 J 0.8 U 0.08 U 0.08 U 0.08 U 0.08 U Cadmium T 2 02L ug/I 0.08 U 0.08 U 0.14 J+ 0.08 U 0.054 J 0.8 U 0.08 U 0.08 U 0.08 U 0.08 U Calcium T -- ug/1 18200 364 18000 6220 578 153000 31900 31800 1070 J+ 1810 J+ Carbon N -- ug/I 2300 1000 U 1400 5400 1000 U 2200 2200 2200 1000 U 1000 U Chloride N 250000 02L ug/I 3000 2200 4900 -- 3300 2400 2300 2300 2400 2500 Chromium D -- ug/I 28.4 0.66 J+ 5 12.1 0.19 J 0.97 J 7.6 7.3 0.34 J+ 0.26 J+ Chromium T 10 02L ug/1 29.1 2.8 J+ 12.5 19.6 0.51 J+ 11.1 23.7 22.5 0.4 J+ 0.34 J+ Chromium 6+ T 0.07 DHHS ug/1 0.21 0.072 J+ 3.5 3.8 0.017 J 2.4 0.053 0.05 0.013 J 0.03 U Cobalt D -- ug/1 0.56 1.6 0.048 J 0.24 0.88 0.12 J 0.056 J 0.059 J 4.2 4.2 Cobalt T 1 IMAC ug/1 5.3 1.7 0.22 0.54 0.89 0.42 J 0.18 0.15 4.1 4.5 Copper D -- ug/I 1.6 1.2 0.19 J 0.34 J 3 5 U 1.4 J 0.94 J 2.1 2.3 Copper T 1000 02L ug/I 27.4 0.48 J 0.94 1.1 0.39 J+ 5.3 2.2 2.3 1.3 J+ 1.3 J+ Iron D -- ug/1 190 50 U 50 U 27 J 50 U 50 U 50 U 50 U 450 430 Iron T 300 02L ug/1 5930 J+ 75 74.9 259 26.4 J 78.2 38.2 J 33.7 J 228 J 634 J Lead D -- ug/1 0.1U 0.1U 0.1U 0.1U 0.1U 1U 0.1U 0.1U 0.1U 0.11 Lead T 15 02L ug/I 0.4 0.1 U 0.1 J+ 0.14 0.1 1 U 0.1 U 0.13 J+ 0.1 U 0.1 U Magnesium T -- ug/I 2970 151 1420 576 415 111 143 136 443 444 Manganese D -- ug/I 17 170 5 U 3.3 J 29 5 U 5 U 5 U 130 120 Manganese T 50 02L ug/1 140 198 5 U 13.7 33.8 5 U 5 U 5 U 111 147 Mercury D -- ug/1 0.2 U 0.2 U 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 T 1 02L ug/I 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Methane N -- ug/I 1.9 J+ 1.6 J+ 1.6 J+ 1.6 J+ 1.5 J+ 2.2 J+ 1.9 J+ 1.8 J+ 116 J 166 J Molybdenum D ug/I 12.7 0.5 U 122 3.3 0.5 U 5.1 1.8 1.8 0.5 U 0.5 U Molybdenum T ug/I 9.3 0.11 J 137 3.8 0.5 U 4.9 J 2 2 0.5 U 0.5 U Nickel D -- ug/I 12 2.9 1.6 7.6 0.71 5 U 0.82 0.76 3.3 3.5 Nickel T 100 02L ug/I 12.8 4.8 4.3 12.7 0.47 J 5.8 2.5 2.2 3.7 3.5 Nitrogen, NO2 plus NO3 N -- ug/I 20 U 1100 20 U 68 28 20 U 20 U 20 U 410 400 Potassium T ug/I 13800 5000 U 2830 J 5000 U 5000 U 72900 13100 13000 5000 U 5000 U Selenium D -- ug/I 0.5 U 0.5 U 1.4 0.5 U 0.5 U 5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 20 02L ug/I 1.6 0.5 U 1.7 0.5 U 0.5 U 5 U 0.36 J 0.5 U 0.5 U 0.5 U Sodium T -- ug/I 13900 2530 J 19500 8800 5000 U 36800 15100 15000 5000 U 5000 U Strontium D ug/I 120 5 U 100 90 9.5 1500 400 390 26 25 Strontium T -- ug/1 336 2.9 J 117 108 10.3 1660 428 439 14.9 J+ 30 J+ Sulfate N 250000 02L ug/I 18800 1000 U 32600 -- 1000 U 8400 7300 7300 790 J 830 J Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.1 U 0.032 J 0.1 U 0.1 U 0.1 U 1 U 0.1 U 0.1 U 0.1 U 0.1 U Thallium T 0.2 IMAC ug/1 0.1 U 0.041 J 0.1 U 0.1 U 0.1 U 1 U 0.1 U 0.1 U 0.1 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 117000 25000 U 120000 92000 25000 U 250000 U 141000 163000 25000 U 25000 U Total Organic Carbon N -- ug/I -- -- -- -- -- -- -- -- -- -- Total Suspended Solids N ug/1 598000 6100 3100 9800 5800 14500 2500 U 2500 U 2500 U 2500 U Uranium, Natural T Ug/1 -- -- -- -- -- -- -- -- -- -- Vanadium D -- Ug/1 9.2 0.11 J 7 3.6 0.3 U 3.4 19.2 19.3 0.3 U 0.3 U Vanadium T 0.3 IMAC ug/1 20.5 0.18 J 8 3.9 0.097 J 3.5 21 20.9 0.3 U 0.3 U Riverbend Steam Station 9 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: GWA-21D 3/24/2016 N RV-GWA-21D Round 5 GWA-21S 3/24/2016 N RV-GWA-21S Round 5 GWA-22BR-A 3/23/2016 N RV-GWA-22BR Round 5 GWA-22D 3/23/2016 N RV-GWA-22D Round 5 GWA-22S 3/23/2016 N RV-GWA-22S Round 5 GWA-23BR 3/23/2016 N RV-GWA-23BR Round 5 GWA-23D 3/23/2016 N RV-GWA-23D Round 5 GWA-23D 3/23/2016 FD RV-FD-GWA-23D Round 5 GWA-23S 3/22/2016 N RV-GWA-23S Round 5 GWA-23S 3/22/2016 FD RV-FD-GWA-23S Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Zinc D -- ug/I 7.9 J 25 10 U 7.5 J 7.7 J 10 U 10 U 10 U 29 30 Zinc T 1000 02L ug/I 17.6 27.6 5.4 J 19.8 4.5 J 10.4 9 J 15.7 J 25 J+ 33.3 J Dissolved Oxygen N -- mg/I 0.9 2.7 1.5 7.63 6.3 0.4 0.3 0.3 2.4 2.4 Oxidation Reduction Potential N mV 59.3 326.1 43.5 77.6 334.9 -178.4 -99.4 -99.4 183.6 183.6 pH N 6.5 - 8.5 02L SU 10.7 4.7 9.6 8.1 5.3 12.2 11.2 11.2 5 5 Specific Conductivity N PS/cm 149.8 20.1 199.4 60.3 22 2485 388.6 388.6 32.3 32.3 Temperature N Deg C 17.6 21.2 19 20.4 19.1 20.5 19.2 19.2 13.6 13.6 Turbidity, field N I I NTU 8.1 1 9.7 7.6 6 8.2 1 9.8 1 9.3 9.3 2.1 2.1 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter mV = millivolts NTU - nephelometric turbidity units pCi/L = 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 .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 Riverbend Steam Station 10 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: GWA-2131R 3/23/2016 N RV-GWA-2BR Round 5 GWA-2BRU 3/24/2016 N RV-GWA-2BRU Round 5 GWA-2S 3/23/2016 N RV-GWA-2S Round 5 GWA-3D 3/24/2016 N RV-GWA-3D Round 5 GWA-3S-A 3/24/2016 N RV-GWA-3S-A Round 5 GWA-4BR 3/23/2016 N RV-GWA-4BR Round 5 GWA-41D 3/23/2016 N RV-GWA-4D Round 5 GWA-4S 3/23/2016 N RV-GWA-4S Round 5 GWA-4S 3/23/2016 FD RV-GWA-4S-FD Round 5 GWA-51D 3/24/2016 N RV-GWA-SD Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Alkalinity, CO3 N Ug/1 5000 U 5000 U 5000 U 5000 U 324000 156000 5000 U 5000 U 17900 Alkalinity, HCO3 N Ug/1 71400 28600 88100 31300 126000 5000 U 6000 6200 49400 Alkalinity, lab N Ug/1 71400 -- 28600 88100 31300 450000 183000 6000 6200 67200 Aluminum D Ug/1 100 U 2600 100 U 67 J 63 J 550 310 150 150 190 Aluminum T Ug/1 69 J+ 3030 678 J+ 72 J 123 642 446 177 165 1740 J+ Antimony D Ug/1 0.28 J 23 0.5 U 10 U 10 U 4.2 J 5 U 5 U 5 U 0.5 U Antimony T 1 IMAC Ug/1 0.3 J 23.1 0.5 U 10 U IOU 4.8 J 5 U 5 U 5 U 0.5 U Arsenic D -- Ug/1 0.93 1 U 0.1 U 2 U 2 U 1 U 4.5 0.74 J 0.73 J 0.72 Arsenic T 10 02L Ug/1 1.1 1 U 0.053 J 2 U 2 U 1 U 5.6 0.82 J 0.78 J 0.76 Barium D -- ug/1 9.6 70 41 33 26 67 7.9 19 19 7.1 Barium T 700 02L ug/I 11.2 82 46.6 42.2 29.8 74.7 6.5 22.2 21.3 24.9 Beryllium D -- ug/1 0.1 U 1 U 0.1 U 2 U 2 U 1 U 1 U 4.2 J 2.6 J 0.1 U Beryllium T 4 IMAC ug/1 0.1 U 1 U 0.1 U 2 U 2 U 1 U 1 U 2.9 2.9 0.1 U Boron D -- ug/1 50 U 50 U 440 34 J 50 U 50 U 50 U 37 J 36 J 50 U Boron T 700 02L ug/I 50 U 50 U 434 41.5 J 30.3 J 50 U 26.6 J 40.4 J 40 J 50 U Cadmium D -- ug/I 0.08 U 0.8 U 0.08 U 1.6 U 1.6 U 0.52 J 0.8 U 0.8 U 0.8 U 0.08 U Cadmium T 2 02L ug/I 0.08 U 0.8 U 0.08 U 1.6 U 1.6 U 0.8 U 0.8 U 0.8 U 0.8 U 0.08 U Calcium T -- ug/1 32300 96800 12500 440000 407000 152000 16000 67800 66300 23400 Carbon N -- ug/I 1000 U 6700 1000 U 1000 U 1000 U 1100 1600 3500 3400 1000 U Chloride N 250000 02L ug/I 5100 -- 5800 6200 5900 3300 3600 11300 11000 2300 Chromium D -- ug/I 0.6 J+ 25.3 1.2 J+ 10 UJ 10 UJ 14.9 5 U 5 U 1.2 J 6.6 Chromium T 10 02L ug/1 3.3 J+ 27 1.8 J+ 10 U 10 U 15.4 0.92 J+ 5 U 0.9 J+ 8.6 Chromium 6+ T 0.07 DHHS ug/1 0.079 -- 0.88 0.03 U 0.03 U 15.6 J 0.092 0.18 0.24 4.8 J+ Cobalt D -- ug/1 0.051 J 1 U 0.015 J 1.5 J 6.7 1 U 1 U 51 48.4 0.29 Cobalt T 1 IMAC ug/1 0.088 J+ 0.11 J 0.53 1.6 J 5.9 1 U 1 U 49.8 48.8 1.9 Copper D -- ug/I 0.24 J 5.8 8.4 10 UJ 10 UJ 3.4 J 5 U 9.6 J 5.2 J 1.3 Copper T 1000 02L ug/I 0.48 J+ 6.8 1.1 J+ 10 U IOU 2 J 5 U 3.2 J 3.1 J 5.4 Iron D -- ug/1 50 U 50 U 50 U 210 1600 50 U 50 U 50 U 50 U 82 Iron T 300 02L ug/1 57.1 40.8 J $82 294 2020 50 U 68.2 50 U 50 U 1530 Lead D -- ug/1 0.1U 1U 1 2U 2U 1U 1U 1U 1U 0.1U Lead T 15 02L ug/I 0.1 U 1 U 0.1 U 2 U 2 U 1 U 1 U 1 U 1 U 0.48 Magnesium T -- ug/I 5550 100 U 6910 143000 152000 100 U 192 43000 42200 1070 Manganese D -- ug/I 20 5 U 12 13400 12700 5 U 5 U 730 720 8 Manganese T 50 02L ug/1 22.7 5 U 44.3 11800 12700 5 U 5 U 795 767 105 Mercury D -- ug/1 0.2 U 0.2 U 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 T 1 02L ug/I 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Methane N -- ug/I 2.7 J+ 2.4 J+ 1.7 J+ 1.6 J+ 1.6 J+ 2.5 J+ 2.3 J+ 1.6 J+ 1.6 J+ 1.8 J Molybdenum D ug/I 5.9 32.3 0.5 U 10 U 10 U 8.7 22.3 5 U 5 U 2 Molybdenum T ug/I 6.3 33.1 0.5 U 10 U 10 U 9.2 28.3 5 U 5 U 1.7 Nickel D -- ug/I 0.88 5 U 0.5 U 57.8 73 5 U 5 U 43.9 39.9 0.59 Nickel T 100 02L ug/I 1.8 5 U 0.79 48.5 73.7 5 U 5 U 41.7 40.9 2.5 Nitrogen, NO2 plus NO3 N -- ug/I 20 U 63 370 20 U 20 U 20 U 101 23 27 20 U Potassium T ug/I 6760 122000 5000 U 10700 8780 31700 5000 U 5000 U 5000 U 5000 U Selenium D -- ug/I 0.36 J 5 U 0.5 U 10 U 10 U 5 U 5 U 15.9 16.9 0.31 J Selenium T 20 02L ug/I 0.5 U 5 U 0.5 U 10 U 10 U 5 U 5 U 16.1 15 0.83 Sodium T -- ug/I 9230 77500 5730 49900 42000 26200 60700 6960 6970 10800 Strontium D ug/I 140 950 170 1800 1700 680 87 520 510 130 Strontium T -- ug/1 162 1130 167 2040 2010 753 78.7 602 568 160 Sulfate N 250000 02L ug/I 39600 -- 35700 1580000 J 1580000 J 17400 8900 394000 389000 J 7600 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.1 U 1 U 0.1 U 2 U 2 U 1 U 1 U 1 U 1 U 0.1 U Thallium T 0.2 IMAC ug/1 0.1 U 1 U 0.1 U 2 U 2 U 1 U 1 U 1 U 1 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 174000 135000 2110000 2190000 454000 195000 588000 597000 113000 Total Organic Carbon N -- ug/I -- -- -- -- -- -- -- -- -- Total Suspended Solids N Ug/1 2500 U 12600 2500 U 5800 4000 2500 U 2600 U 5000 U 158000 Uranium, Natural T Ug/1 -- -- -- 10 U 10 U -- -- -- -- -- Vanadium D -- Ug/1 2.7 1.3 J 1.1 6 U 1.9 J 8.4 12.4 3 U 3 U 15.7 Vanadium T 0.3 IMAC Ug/1 3.2 1.3 J 3.9 6 U 1.7 J 8.9 14 3 U 3 U 16.5 Riverbend Steam Station 11 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: GWA-2BR 3/23/2016 N RV-GWA-2BR Round 5 GWA-213RU 3/24/2016 N RV-GWA-2BRU Round 5 GWA-2S 3/23/2016 N RV-GWA-2S Round 5 GWA-3D 3/24/2016 N RV-GWA-3D Round 5 GWA-3S-A 3/24/2016 N RV-GWA-3S-A Round 5 GWA-4BR 3/23/2016 N RV-GWA-4BR Round 5 GWA-4D 3/23/2016 N RV-GWA-4D Round 5 GWA-4S 3/23/2016 N RV-GWA-4S Round 5 GWA-4S 3/23/2016 FD RV-GWA-4S-FD Round 5 GWA-5D 3/24/2016 N RV-GWA-SD Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Zinc D -- ug/I 10 U 12 7.7 J 6.7 J 6.2 J 10 U 10 U 51 43 10 U Zinc T 1000 02L ug/I 6.5 J+ 12.9 3.8 J+ 3.9 J 13.7 4.1 J 2.8 J 45.6 43.9 7.6 J Dissolved Oxygen N -- mg/I 6.4 -- 3 0.5 0.4 0.4 0.52 2.51 2.51 4.7 Oxidation Reduction Potential N my -74 195 -60.1 -23.3 -30.9 5.5 228 228 42 pH N 6.5 - 8.5 02L SU 8.4 6 6.6 5.6 11.9 10.8 5.1 5.1 10.3 Specific Conductivity N PS/cm 244 166 2675 2563 2003 437.2 756 756 148 Temperature N Deg C 18 18 16 20 14.7 20 15.1 15.1 16.7 Turbidity, field N I FWTU-1-7 11 0.5 3.1 3.61 1.83 2 2 83.9 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter mV = millivolts NTU - nephelometric turbidity units pCi/L = 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 .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 Riverbend Steam Station 12 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: GWA-61D 3/23/2016 N RV-GWA-6D Round 5 GWA-6S 3/23/2016 N RV-GWA-6S Round 5 GWA-7BR 3/23/2016 N RV-GWA-7BR Round 5 GWA-7D 3/23/2016 N RV-GWA-7D Round 5 GWA-7S 3/23/2016 N RV-GWA-7S Round 5 GWA-8D 3/22/2016 N RV-GWA-BD Round 5 GWA-8S 3/23/2016 N RV-GWA-BS Round 5 GWA-9D 3/23/2016 N RV-GWA-9D Round 5 GWA-9S 3/23/2016 N RV-GWA-9S Round 5 MW-15BR 3/23/2016 N RV-MW-15BR Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Alkalinity, CO3 N Ug/1 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N Ug/1 174000 9800 82200 80800 31100 42500 5000 U 23300 5000 U 4000 J Alkalinity, lab N Ug/1 174000 9800 82200 80800 31100 42500 5000 U 23300 5000 U 4000 J Aluminum D Ug/1 1800 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Aluminum T Ug/1 2230 81.1 J 100 U 100 U 100 U 100 U 100 U 100 U 73 J 100 U Antimony D -- Ug/1 5 U 0.19 J 0.5 U 0.5 U 0.5 U 0.29 J 0.5 U 0.5 U 0.5 U 0.5 U Antimony T 1 IMAC Ug/1 5 U 0.19 J 0.5 U 0.5 U 0.5 U 0.28 J 0.5 U 0.5 U 0.5 U 0.5 U Arsenic D -- Ug/1 2.2 0.18 0.11 0.29 0.1 0.097 J 0.1 U 0.045 J 0.046 J 0.1 U Arsenic T 10 02L Ug/1 2.6 0.23 0.1 0.33 0.11 0.098 J 0.1 U 0.053 J 0.059 J 0.043 J Barium D -- ug/1 30 59 3.8 J 7.7 26 3.1 J 150 6.3 26 73 Barium T 700 02L ug/I 36.6 65 4.3 J 8.4 29 3.1 J 160 6.9 28.8 80.5 Beryllium D -- ug/1 1 U 0.15 0.1 U 0.1 U 0.1 U 0.1 U 0.18 0.1 U 0.085 J 0.15 Beryllium T 4 IMAC ug/1 1 U 0.072 J+ 0.1 U 0.1 U 0.1 U 0.1 U 0.28 0.1 U 0.021 J 0.14 Boron D -- ug/1 50 U 50 U 50 U 50 U 50 U 98 210 240 150 260 Boron T 700 02L ug/I 50 U 50 U 50 U 50 U 50 U 93.3 231 268 159 268 Cadmium D -- ug/I 0.8 U 0.24 0.08 U 0.08 U 0.08 U 0.08 U 0.069 J 0.08 U 0.08 U 0.08 U Cadmium T 2 02L ug/I 0.8 U 0.61 0.08 U 0.08 U 0.053 J 0.08 U 0.082 0.08 U 0.08 U 0.08 U Calcium T -- ug/1 70000 J- 1390 18800 18800 6220 11600 1800 10200 2010 3540 Carbon N -- ug/I 850 J 660 J 1000 U 1000 U 1000 U 1000 U 1000 U 1000 U 1000 U -- Chloride N 250000 02L ug/I 3000 2100 3100 2900 3800 6000 5400 6300 5700 6600 Chromium D -- ug/I 45.4 1.6 2.9 2.5 1.1 2.1 6.7 0.36 J 0.69 4.5 Chromium T 10 02L ug/1 55.1 2.9 J+ 3.4 3 1.9 J+ 2.4 J+ 6.9 5.6 0.66 J+ 4.7 Chromium 6+ T 0.07 DHHS ug/1 56.1 J 0.32 2.5 1.4 0.93 0.017 J 9.2 J 0.04 0.26 5.5 Cobalt D -- ug/1 1 U 13.3 0.022 J 0.097 J 0.12 0.092 J 80.2 0.14 47 2.1 Cobalt T 1 IMAC ug/1 0.13 J+ 13.5 0.01 J+ 0.053 J+ 0.12 J+ 0.081 J+ 78.9 0.13 48.7 1.5 Copper D -- ug/I 1.7 J 3.2 0.43 J 0.75 0.43 J 0.27 J 19.3 0.72 4.5 2.5 Copper T 1000 02L ug/I 3.8 J 4.8 0.36 J+ 0.31 J+ 0.25 J+ 0.26 J 15.1 0.48 J 0.86 0.36 J Iron D -- ug/1 50 U 99 50 U 44 J 50 U 50 U 50 U 50 U 50 U 92 Iron T 300 02L ug/1 111 121 50 U 32.8 J 32.6 J 70 50 U 54.4 50 U 81.2 Lead D -- ug/1 1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.11 0.1U Lead T 15 02L ug/I 1U 0.1U 0.1U 0.1U 0.1U 0.11 0.1U 0.1U 0.1U 0.1U Magnesium T -- ug/I 80.9 J 763 7130 5800 4380 8800 6160 5760 2680 2920 Manganese D -- ug/I 5 U 780 5 U 2.6 J 3.7 J 14 660 21 2600 J- 84 Manganese T 50 02L ug/1 3.1 843 5 U 5 U 4.2 J 13.1 687 22.3 2630 59 Mercury D -- ug/1 0.2 U 0.58 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 T 1 02L ug/I 0.2 U 0.75 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.093 J 0.2 U Methane N -- ug/I 1.5 J+ 2.1 J+ 1.5 J+ 1.3 J+ 1.5 J+ 1.6 J+ 1.4 J+ 4.7 J+ 1.6 J+ 1.5 J+ Molybdenum D ug/I 19.6 0.5 U 0.28 J 0.58 0.5 U 0.44 J 0.5 U 0.5 U 0.5 U 0.5 U Molybdenum T ug/I 24.5 0.5 U 0.26 J 0.78 0.5 U 0.4 J 0.5 U 0.5 U 0.5 U 0.5 U Nickel D -- ug/I 5 U 7.6 0.96 0.82 1.8 1.3 24 1.6 2.5 1.3 Nickel T 100 02L ug/I 5 U 8.1 0.5 U 0.88 0.98 0.5 U 22.6 20.9 2.1 1.2 Nitrogen, NO2 plus NO3 N -- ug/I 20 U 61 110 98 20 U 20 U 4500 20 U 210 48 Potassium T ug/I 2640 J 5000 U 5000 U 5000 U 5000 U 5000 U 3680 J 5000 U 5000 U 5000 U Selenium D -- ug/I 5 U 0.4 J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 1.1 Selenium T 20 02L ug/I 5 U 0.42 J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 1.8 Sodium T -- ug/I 8240 5000 U 5420 7400 5000 U 4500 J 6410 6920 5750 9790 Strontium D ug/I 200 12 140 140 46 69 16 96 28 59 Strontium T -- ug/1 235 13.4 152 150 50.4 71.6 17 105 30.2 63.5 Sulfate N 250000 02L ug/I 14800 750J 4400 4500 1000 U 24500 39000 32900 25500 28600 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 1 U 0.037 J 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 T 0.2 IMAC ug/1 1 U 0.025 J 0.1 U 0.1 U 0.1 U 0.1 U 0.024 J 0.1 U 0.1 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 189000 25000 U 84000 103000 34000 126000 60000 51000 37000 78000 Total Organic Carbon N -- ug/I -- -- -- -- -- -- -- -- -- 1000 U Total Suspended Solids N Ug/1 3500 2500 U 2500 U 2500 U 2500 U 5000 U 2500 U 2500 U 2500 U 2500 U Uranium, Natural T Ug/1 -- -- -- -- -- 0.5 U 0.5 U -- 0.5 U -- Vanadium D Ug/1 20.3 0.3 U 11 10.1 0.44 4.1 0.3 U 3 0.3 U 0.12 J Vanadium T 0.3 IMAC ug/1 21 0.2 J 11 10.2 0.5 4.4 0.3 U 3.5 0.12 J 0.23 J Riverbend Steam Station 13 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: GWA-6D 3/23/2016 N RV-GWA-6D Round 5 GWA-6S 3/23/2016 N RV-GWA-6S Round 5 GWA-7BR 3/23/2016 N RV-GWA-7BR Round 5 GWA-7D 3/23/2016 N RV-GWA-7D Round 5 GWA-7S 3/23/2016 N RV-GWA-7S Round 5 GWA-8D 3/22/2016 N RV-GWA-BD Round 5 GWA-8S 3/23/2016 N RV-GWA-8S Round 5 GWA-9D 3/23/2016 N RV-GWA-9D Round 5 GWA-9S 3/23/2016 N RV-GWA-9S Round 5 MW-15BR 3/23/2016 N RV-MW-15BR Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit 14 Zinc D -- Ug/I 10U 91 6.6J 10U 8.8J 10U 29 10U 9.3J 5.6J Zinc T 1000 02L ug/I 4.4 J 86.7 6.1 J 10 U 6.2 J 4.9 J 22.7 2.6 J 6.8 J 10.2 Dissolved Oxygen N -- mg/1 2.9 2.1 2.9 3.6 4.7 0.3 1.1 0.28 0.89 3.8 Oxidation Reduction Potential N mV 41 314.6 126.3 182.9 170.7 -16 321.4 112.7 211 290.3 pH N 6.5 - 8.5 02L SU 11.6 4.8 7.3 8 6 8.2 4.8 6.5 5.6 5.1 Specific Conductivity N PS/cm 817 34.5 172.3 176.2 75 171 125.4 137.5 83.8 118.3 Temperature N I Deg C 17.9 16.2 18.7 18.1 19.5 18.5 16.6 17.2 18.3 20.7 Turbidity, field N I I NTU 1 9.9 9.6 3.21 3.8 3.56 1.85 2.9 2.55 4.06 0.8 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCi/L = 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 .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 Riverbend Steam Station 14 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: MW-15D 3/23/2016 N RV-MW-15D Round 5 MW-1D 3/22/2016 N RV-MW-1D Round 5 MW-1S 3/22/2016 N RV-MW-1S Round 5 MW-2D 3/22/2016 N RV-MW-2D Round 5 MW-2S 3/22/2016 N RV-MW-2S Round 5 MW-3D 3/22/2016 N RV-MW-3D Round 5 MW-3S 3/22/2016 N RV-MW-3S Round 5 MW-4D 3/22/2016 N RV-MW-4D Round 5 MW-4S 3/22/2016 N RV-MW-4S Round 5 MW-5D 3/22/2016 N RV-MW-5D Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Alkalinity, CO3 N Ug/1 104000 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N Ug/1 81800 19200 20300 38900 5000 U 54800 56000 16100 12100 72200 Alkalinity, lab N ug/1 186000 19200 20300 38900 5000 U 54800 56000 16100 12100 72200 Aluminum D Ug/1 76 J 100 U 100 U 100 U 430 100 U 100 U 130 250 100 U Aluminum T Ug/1 400 100 U 100 U 51.3 J 451 100 U 135 182 1060 100 U Antimony D Ug/1 5 U 0.5 U 0.5 U 0.5 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Antimony T 1 IMAC ug/1 5 U 0.5 U 0.5 U 5.4 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Arsenic D -- Ug/1 1 U 0.044 J 0.36 0.11 0.36 0.062 J 0.1 U 0.1 U 0.48 0.074 J Arsenic T 10 02L ug/1 1 U 0.048 J 0.36 1.2 0.36 0.054 J 0.1 U 0.048 J 0.28 0.08 J Barium D -- ug/1 48 25 18 20 55 7.2 21 59 22 28 Barium T 700 02L ug/I 66.8 28.4 21.1 22.7 62 8.2 7.4 63.6 28.8 30.7 Beryllium D -- ug/1 1 U 0.067 J 0.1 U 0.1 U 0.078 J 0.1 U 0.1 U 0.1 U 0.38 0.1 U Beryllium T 4 IMAC ug/1 1 U 0.1 U 0.1 U 1 U 0.047 J 0.1 U 0.1 U 0.1 U 0.21 0.1 U Boron D -- ug/1 240 570 270 50 U 200 250 210 250 300 390 Boron T 700 02L ug/I 212 636 313 50 U 234 279 327 262 323 426 Cadmium D -- ug/I 0.8 U 0.088 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.091 Cadmium T 2 02L ug/I 0.8 U 0.11 0.08 U 2 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U Calcium T -- ug/1 22600 24700 1990 6150 9910 17000 16700 10500 5870 23200 Carbon N -- ug/I -- 1000 U 1000 U 1000 U 1000 U 1000 U 1000 U 1000 U 4300 1000 U Chloride N 250000 02L ug/I 7700 6400 8900 2900 6300 6400 6000 5600 6200 6500 Chromium D -- ug/I 2.1 J+ 0.61 0.31 J 0.87 J+ 0.15 J+ 1.8 0.33 J+ 1 5.3 2 Chromium T 10 02L ug/1 1.1 J+ 0.88 J+ 0.24 J+ 32.8 0.2 J+ 1.8 J+ 0.29 J+ 1.1 J+ 4.3 J+ 2 J+ Chromium 6+ T 0.07 DHHS ug/1 0.32 J+ 0.49 0.03 U 0.58 J- 0.045 1.4 0.053 0.58 0.32 1.5 Cobalt D -- ug/1 1 U 0.28 60.5 0.012 J 17.8 0.023 J 0.86 0.6 16.1 0.049 J Cobalt T 1 IMAC ug/1 1 U 0.36 60.1 1.2 19 0.05 J 0.71 0.6 13.1 0.049 J Copper D -- ug/I 5 U 1.6 0.25 J 1.2 17.9 0.38 J 0.39 J 0.24 J 4.1 0.52 Copper T 1000 02L ug/I 5 U 0.75 J+ 0.5 UJ 11.1 5.1 0.19 J 0.18 J 0.15 J 1 0.13 J Iron D -- ug/1 50 U 50 U 25300 50 U 50 U 50 U 52 120 300 50 U Iron T 300 02L ug/1 50 U 50 U 29500 87.8 50 U 36.1 J 130 247 1210 50 U Lead D -- ug/1 1U 0.1U 0.1U 0.1U 0.15 0.1U 0.1U 0.1U 2.5 0.1U Lead T 15 02L ug/I 1U 0.1U 0.1U 1U 0.14 0.1U 0.1U 0.1U 1.1 0.1U Magnesium T -- ug/I 168 8220 991 3640 1980 8840 9790 3480 5030 11900 Manganese D -- ug/I 5 U 420 2400 5 U 240 5 U 200 19 270 5.5 Manganese T 50 02L ug/1 5 U 475 2730 4.4 J 271 5 U 8.4 19.1 253 5.9 Mercury D -- ug/1 0.2 U 0.2 U 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 T 1 02L ug/I 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Methane N -- ug/I 2.1 J+ 2.3 J+ 78.5 1.6 J+ 1.6 J+ 5.7 J+ 2 J+ 7.2 J+ 1.8 J+ 1.9 J+ Molybdenum D ug/I 8.5 0.16 J 0.17 J 0.12 J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.22 J Molybdenum T ug/I 12.1 0.18 J 0.12 J 1.6 J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.21 J Nickel D -- ug/I 5 U 6.6 1.9 1 2.3 0.5 U 0.58 1.1 3.7 0.7 Nickel T 100 02L ug/I 5 U 5 0.5 U 20.4 2.2 0.5 U 0.5 U 1.1 1.9 0.5 U Nitrogen, NO2 plus NO3 N -- ug/I 20 U 20 U 20 U 54 190 60 20 U 33 110 140 Potassium T ug/I 51400 5000 U 5000 U 5000 U 5040 5000 U 5000 U 5000 U 5000 U 5000 U Selenium D -- ug/I 5 U 0.5 U 0.5 U 0.5 U 3.9 0.5 U 0.5 U 0.5 U 2.6 0.5 U Selenium T 20 02L ug/I 5 U 0.5 U 0.5 U 5 U 3.6 0.5 U 0.5 U 0.5 U 1.3 0.5 U Sodium T -- ug/I 76700 9390 5920 5350 6610 3910 J 3910 J 7250 6890 7970 Strontium D ug/I 550 260 28 77 240 160 140 160 50 230 Strontium T -- ug/1 750 296 31.9 78.9 253 185 120 171 51.7 255 Sulfate N 250000 02L ug/I 35300 93200 1000 1100 51700 26400 28300 31800 26800 44800 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 120 100 U Thallium D -- ug/I 1 U 0.049 J 0.1 U 0.1 U 0.086 J 0.1 U 0.1 U 0.1 U 0.032 J 0.1 U Thallium T 0.2 IMAC ug/1 1 U 0.067 J 0.1 U 1 U 0.089 J 0.1 U 0.1 U 0.1 U 0.035 J 0.1 U Total Dissolved Solids N 500000 02L ug/I 281000 177000 37000 77000 86000 121000 126000 89000 J+ 114000 J+ 175000 J+ Total Organic Carbon N -- ug/I 2500 -- -- -- -- -- -- -- -- -- Total Suspended Solids N ug/1 7800 2500 U 17200 2500 U 2500 U 2500 U 2500 U 7300 345000 2500 U Uranium, Natural T ug/1 -- -- -- 0.5 U Vanadium D I -- ug/1 2.2 J 1.5 0.3 U 3.2 0.3 U 5.3 0.46 1.1 5.9 7.9 Vanadium I T 1 0.3 1 IMAC I ug/I 1 3 J 1 1.5 0.3 U 33.8 0.3 U 5.2 0.35 1.2 2.8 8 Riverbend Steam Station 15 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: MW-15D 3/23/2016 N RV-MW-15D Round 5 MW-1D 3/22/2016 N RV-MW-1D Round 5 MW-is 3/22/2016 N RV-MW-1S Round 5 MW-2D 3/22/2016 N RV-MW-2D Round 5 MW-2S 3/22/2016 N RV-MW-2S Round 5 MW-3D 3/22/2016 N RV-MW-3D Round 5 MW-3S 3/22/2016 N RV-MW-3S Round 5 MW-4D 3/22/2016 N RV-MW-4D Round 5 MW-4S 3/22/2016 N RV-MW-4S Round 5 MW-5D 3/22/2016 N RV-MW-SD Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Zinc D -- ug/I 10 U 8.8 J 10 U 76 11 10 U 10 U 2.7 J 16 10 U Zinc T 1000 02L ug/I 3.4 J 9.7 J 10 U 62.6 5.1 J+ 10 UJ 10 UJ 10 U 11.7 10 U Dissolved Oxygen N -- mg/I 0.5 0.24 0.08 3.11 4.83 0.31 3.99 0.2 3.4 0.4 Oxidation Reduction Potential N mV -159.5 136.2 104.3 92.1 299.9 94.2 107 136 184 66 pH N 6.5 - 8.5 02L SU 11.7 6.5 6.7 6.6 4.4 6.8 6.1 5.8 5.8 6.7 Specific Conductivity N PS/cm 1610 270 160.7 68 122.4 137.6 138.3 136 137 264 Temperature N Deg C 20 17.3 15.2 17.6 17 15.1 14.6 14 14 15 Turbidity, field N I I NTU 6.5 1 0.88 8.02 3 3.9 2.17 1 6.3 1 9 62 0.5 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter mV = millivolts NTU - nephelometric turbidity units pCi/L = 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 .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 Riverbend Steam Station 16 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: MW-5S 3/22/2016 N RV-MW-SS Round 5 MW-6D 3/22/2016 N RV-MW-6D Round 5 MW-6S 3/22/2016 N RV-MW-6S Round 5 MW-7BR 3/28/2016 N RV-MW-7BR Round 5 MW-7D 3/23/2016 N RV-MW-7D Round 5 MW-9BR 3/22/2016 N RV-MW-9BR Round 5 MW-9D 3/22/2016 N RV-MW-9D Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Alkalinity, CO3 N ug/I 5000 U 5000 U 5000 U 251000 5000 U 361000 79900 Alkalinity, HCO3 N ug/I 4600 J 31300 21000 5000 U 17500 38200 5000 U Alkalinity, lab N ug/I 4600 J 31300 21000 1210000 17500 399000 107000 Aluminum D ug/I 100 U 100 U 100 U 210 100 U 84 J 320 Aluminum T ug/I 100 U 96.2 J 100 U 506 100 U 383 641 Antimony D -- ug/I 0.5 U 0.5 U 0.5 U 7.4 J 0.5 U 3.5 J 2.5 Antimony T 1 IMAC ug/I 0.5 U 0.5 U 0.5 U 6.5 J 0.5 U 0.64 4.6 Arsenic D -- ug/I 0.1 U 0.1 U 0.1 U 2 U 0.1 U 1 U 0.4 Arsenic T 10 02L ug/I 0.1 U 0.042 J 0.1 U 2 U 0.1 U 0.1 U 0.18 Barium D -- ug/I 23 6.1 7.5 410 27 84 14 Barium T 700 02L ug/I 26.5 6.8 8.5 440 29.3 126 17.4 Beryllium D -- ug/I 0.042 J 0.1 U 0.1 U 2 U 0.1 U 1 U 0.1 U Beryllium T 4 IMAC ug/I 0.092 J 0.1 U 0.1 U 2 U 0.1 U 0.1 U 0.1 U Boron D -- ug/I 410 290 200 50 U 50 U 50 U 50 U Boron T 700 02L ug/I 460 310 223 50 U 50 U 50 U 50 U Cadmium D -- ug/I 0.08 U 0.08 U 0.08 U 1.6 U 0.08 U 0.8 U 0.08 U Cadmium T 2 02L ug/I 0.08 U 0.08 U 0.08 U 1.6 U 0.08 U 0.08 U 0.08 U Calcium T -- ug/1 881 13200 10600 483000 2620 145000 46200 Carbon N -- ug/I 1000 U 1000 U 1000 U -- -- 820 J 1000 U Chloride N 250000 02L ug/I 7400 6600 6700 4600 1400 3400 2600 Chromium D -- ug/I 1.9 0.19 J 0.42 J 21.3 1 J+ 5 J+ 19.3 Chromium T 10 02L ug/I 2.1 J+ 1.3 J+ 0.29 J+ 20.1 1.3 J+ 0.78 J+ 22.8 Chromium 6+ T 0.07 DHHS ug/I 1.8 0.057 0.053 18.5 J+ 1.2 0.14 21.2 J Cobalt D -- ug/I 1.8 0.037 J 0.22 2 U 0.1 U 1 U 0.019 J+ Cobalt T 1 IMAC ug/I 1.8 0.089 J 0.22 0.22 J 0.02 J 0.1 U 0.047 J Copper D -- ug/I 2.2 0.65 0.23 J 3.5 J 0.35 J 5 U 0.51 J+ Copper T 1000 02L ug/I 0.26 J 2 0.5 U 2.2 J 0.33 J 0.5 U 1.4 Iron D -- ug/I 50 U 50 U 82 50 U 50 U 50 U 50 U Iron T 300 02L ug/I 46.4 J 102 161 50 U 50 U 50 U 83.1 Lead D -- ug/I 0.1 U 0.1 U 0.1 U 2 U 0.1 U 1 U 0.1 U Lead T 15 02L ug/I 0.1 U 0.098 J 1.4 2 U 0.1 U 0.1 U 0.1 U Magnesium T -- ug/I 850 6340 6270 100 U 944 301 254 Manganese D -- ug/I 24 6.8 45 5 U 5 U 5 U 5 U Manganese T 50 02L ug/I 23.5 7.7 45.7 5 U 5 U 5 U 3.1 J Mercury D -- ug/I 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 1 02L ug/I 0.17 J 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Methane N -- ug/I 1.6 J+ 5.4 J+ 2.8 J+ 5 J+ 1.4 J+ 1.7 J+ 1.9 J+ Molybdenum D ug/I 0.5 U 0.13 J 0.5 U 11 0.5 U 3.8 J 5.3 Molybdenum T ug/I 0.5 U 0.14 J 0.5 U 10.8 0.5 U 0.54 7.1 Nickel D -- ug/I 1.6 0.65 0.5 U 10 U 0.5 U 5 U 0.5 U Nickel T 100 02L ug/I 0.88 0.44 J 0.5 U 10 U 0.56 0.5 U 0.5 U Nitrogen, NO2 plus NO3 N -- ug/I 49 20 U 20 U 151 20 U 240 520 Potassium T ug/1 5000 U 5000 U 5000 U 16200 5000 U 13200 3600 J Selenium D -- ug/I 0.33 J 0.5 U 0.5 U 10 U 0.5 U 5 U 0.32 J Selenium T 20 02L ug/I 0.4 J 0.5 U 0.5 U 10 U 0.5 U 0.5 U 0.38 J Sodium T -- ug/I 11400 6310 6890 28700 3570 J 13900 13800 Strontium D ug/1 20 110 100 1900 45 420 190 Strontium T -- ug/I 22.1 112 111 2020 48.9 607 245 Sulfate N 250000 02L ug/I 14500 35900 38400 5500 J+ 1000 U 15700 37400 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.1 U 0.1 U 0.1 U 2 U 0.1 U 1 U 0.1 U Thallium T 0.2 IMAC ug/I 0.1 U 0.1 U 0.1 U 2 U 0.1 U 0.1 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 60000 J+ 122000 J+ 96000 J+ 1320000 32000 366000 183000 Total Organic Carbon N -- ug/I -- -- -- 1400 1000 U -- -- Total Suspended Solids N ug/I 2500 U 4100 2500 U 7100 2500 U 17100 12400 Uranium, Natural T ug/I -- -- -- 0.5 U -- 5 U 0.5 U Vanadium D -- ug/I 0.076 J 3.3 0.19 J 6 U 0.16 J 2.6 J 17.7 Vanadium T 0.3 IMAC ug/I 0.16 J 4 0.25 J 1.8 J 0.17 J 0.34 14.8 Riverbend Steam Station 17 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Location: Date: Sample Type: Sample Name: Event: MW-5S 3/22/2016 N RV-MW-SS Round 5 MW-6D 3/22/2016 N RV-MW-6D Round 5 MW-6S 3/22/2016 N RV-MW-6S Round 5 MW-7BR 3/28/2016 N RV-MW-7BR Round 5 MW-7D 3/23/2016 N RV-MW-7D Round 5 MW-9BR 3/22/2016 N RV-MW-9BR Round 5 MW-9D 3/22/2016 N RV-MW-9D Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Zinc D -- ug/I 6.9 J 3 J 10 U 7.8 J+ 10 U 3 J 10 U Zinc T 1000 02L ug/I 10 U 10 U 10 U 3.3 J 6.6 J 2.9 J 10 U Dissolved Oxygen N -- mg/I 0.6 0.4 0.3 1.62 3.5 1.8 0.7 Oxidation Reduction Potential N mV 240 122 102 -5.5 254 -85.3 -70.7 pH N 6.5 - 8.5 02L SU 5.2 6.4 6.3 12.6 5.4 12 11.3 Specific Conductivity N PS/cm 82 170 159 4343 45 2049 587 Temperature N Deg C 15 16 16 21.4 22.4 15.2 17.5 Turbidity, field N NTU 3.6 2.4 3.1 9.97 0.8 2.3 7 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter mV = millivolts NTU - nephelometric turbidity units pCi/L = 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 .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 Riverbend Steam Station 18 of 18 CSA Supplement 2 Table 3-2: Round 5 Analytical Results of Porewater Monitoring Location: Date: Sample Type: Sample Name: Event: AB-3S 3/23/2016 N RV-AB-3S Round 5 AB-4S 3/23/2016 N RV-AB-4S Round 5 AB-5S 3/22/2016 N RV-AB-5S Round 5 AB-5SL 3/22/2016 N RV-A13-5SL Round 5 AB-7S 3/22/2016 N RV-AB-7S Round 5 C-is 3/24/2016 FD RV-C-1S DUPLICATE Round 5 C-is 3/24/2016 N RV-C-IS Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Alkalinity, CO3 N ug/1 5000 U 5000 U 5000 U 40400 5000 U 5000 U 5000 U Alkalinity, HCO3 N ug/1 66900 45600 309000 18700 86500 5000 U 5000 U Alkalinity, lab N ug/I 66900 45600 309000 59000 86500 5000 U 5000 U Aluminum D ug/1 100 U 81 J 120 4100 100 U 1700 1700 Aluminum T ug/1 135 491 202 4580 100 U 1850 1820 Antimony D -- ug/1 0.5 U 0.81 17.2 2.6 J 0.72 0.5 U 0.5 U Antimony T 1 IMAC ug/1 0.5 U 0.8 18 2.7 J 0.71 0.5 U 0.5 U Arsenic D -- ug/1 324 129 466 74.1 189 11.7 12.4 Arsenic T 10 02L ug/1 341 151 497 82.4 227 109 11.2 Barium D -- ug/1 240 110 400 71 110 20 20 Barium T 700 02L ug/I 266 117 427 75.8 128 22.1 22.1 Beryllium D -- ug/I 0.1 U 0.1 U 1 U 1 U 0.1 U 1.1 1.4 Beryllium T 4 IMAC ug/I 0.1 U 0.1 U 1 U 1 U 0.1 U 0.9 1 Boron D -- ug/I 260 390 1400 1900 170 240 240 Boron T 700 02L ug/I 286 444 1540 2160 195 257 258 Cadmium D -- ug/I 0.08 U 0.08 U 0.8 U 0.8 U 0.38 0.1 0.13 Cadmium T 2 02L ug/I 0.08 U 0.071 J+ 0.8 U 0.8 U 0.38 0.16 0.11 Calcium T -- ug/I 32000 31200 124000 68900 24500 49500 46000 Carbon N -- ug/I 12300 1000 U 1000 U 2600 1000 U 2400 2400 Chloride N 250000 02L ug/I 7100 5300 9300 7200 4700 7500 7700 Chromium D -- ug/I 0.36 J+ 0.33 J 5 U 5 U 0.52 J+ 1.4 J+ 1.2 J+ Chromium T 10 02L ug/I 0.48 J+ 0.95 J+ 5 U 5 U 0.77 J+ 2.8 1.1 Chromium 6+ T 0.07 DHHS ug/1 0.03 U 0.016 J 0.03 U 0.03 U 0.03 U 0.21 0.03 U Cobalt D -- ug/I 0.71 13.9 1 1 U 24.5 140 148 Cobalt T 1 IMAC ug/1 0.84 16.5 1.2 0.111 24.1 132 128 Copper D -- ug/I 0.2 J 0.76 1.1 J 5 U 0.22 J+ 0.3 J 0.19 J Copper T 1000 02L ug/I 6.4 0.83 2.1 J+ 5 U 0.2 J 0.71 0.71 Iron D -- ug/1 6200 50 U 50 U 50 U 2300 62400 63300 Iron T 300 02L ug/1 7140 83.7 46.9 J 50 U 3280 68500 66200 J+ Lead D -- ug/I 0.1 U 0.1 U 1 U 1 U 0.1 U 0.12 0.16 Lead T 15 02L ug/I 0.42 0.15 1 U 1 U 0.1 U 0.15 0.17 Magnesium T -- ug/I 6960 5390 23900 1120 5280 18700 17200 Manganese D -- ug/I 620 1500 86 4.1 J 1700 2900 3000 Manganese T 50 02L ug/1 693 1750 90.3 5.6 1880 3100 2910 Mercury D -- ug/I 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Mercury T 1 02L ug/I 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U Methane N -- ug/I 108 2.1 J+ 2.2 J+ 294 435 98 127 Molybdenum D ug/I 23.7 33.4 245 475 17.5 0.5 U 0.5 U Molybdenum T ug/I 24.5 32.3 260 527 18.3 0.5 U 0.5 U Nickel D -- ug/I 0.44 J 2.1 5 U 5 U 26.9 64.5 68.4 Nickel T 100 02L ug/I 0.45 J 1.8 5 U 5 U 26.3 61.7 59.1 Nitrogen, NO2 plus NO3 N -- ug/I 20 U 11 J 23 20 U 20 U 20 U 20 U Potassium T ug/1 6860 11500 17200 17000 13700 19000 19000 Selenium D -- ug/I 0.5 U 0.43 J 5 U 5 U 0.5 U 2.4 2.8 Selenium T 20 02L ug/1 0.5 U 0.61 5 U 5 U 0.5 U 2.7 1.8 Sodium T -- ug/1 7260 12900 13000 7880 8060 26400 26800 Strontium D ug/1 1200 990 3800 1800 900 1100 1100 Strontium T -- ug/1 1320 1030 3720 1870 1060 1230 1190 Sulfate N 250000 02L ug/I 60300 90800 143000 165000 38400 415000 J 410000 J Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.1 U 0.19 0.37 J 1 U 0.98 0.5 0.57 Thallium T 0.2 IMAC ug/1 0.1 U 0.22 0.45 J 1 U 1 0.51 0.53 Total Dissolved Solids N 500000 02L ug/I 175000 169000 515000 298000 158000 691000 671000 Total Suspended Solids N -- ug/I 15300 8000 4100 2500 U 6700 5200 7400 Vanadium D -- ug/I 0.17 J 38.7 168 93.3 3.9 2.7 2.9 Vanadium T 0.3 IMAC ug/1 0.57 38 183 107 4.3 2.6 2.3 Zinc D -- ug/1 7 J 7.5 J 10 U 10 U 38 J+ 130 130 Zinc T 1000 02L ug/1 10.4 5 J 10 U 10 U 38.3 127 126 Riverbend Steam Station 1 of 2 CSA Supplement 2 Table 3-2: Round 5 Analytical Results of Porewater Monitoring Location: AB-3S AB-4S AB-5S AB-5SL AB-7S C-is C-is Date: 3/23/2016 3/23/2016 3/22/2016 3/22/2016 3/22/2016 3/24/2016 3/24/2016 Sample Type: N N N N N FD N Sample Name: RV-AB-3S RV-AB-4S RV -AB -SS RV-AB-5SL RV-AB-7S RV-C-IS DUPLICATE RV-C-1S Event: Round 5 Round 5 Round 5 Round 5 Round 5 Round 5 Round 5 NCDEQ 02L GWQS, Constituent Fraction GWQS Source Unit IMAC, or DHHS Dissolved Oxygen N mg/1 3 0.27 0.2 0.2 0.7 0.3 0.3 Oxidation Reduction Potential N mV -120.1 118.6 82.8 -163.5 36.4 146 146 pH N 6.5 - 8.5 02L SU 6.6 6.5 8.1 10.3 6.3 4.7 4.7 Specific Conductivity N PS/cm 300.1 292.2 814 444 280.9 800 800 Temperature N Deg C 19.7 19 18.1 18.4 16.5 16 16 Turbidity, field N NTU 8.61 9.98 7.1 0.9 6.9 6 6 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter mV = millivolts NTU - nephelometric turbidity units pCi/L = 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 .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 Riverbend Steam Station 2 of 2 CSA Supplement 2 Table 3-3: Round 5 Analytical Results of Ash Basin Surface Water Locations Location: Date: Sample Type: Sample Name: Event: SW-1 3/24/2016 N RV-SW-1 Round 5 SW-2 3/24/2016 N RV-SW-2 Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS NCDEQ 02B SWQS (Class B - Water Supply) Unit Alkalinity, CO3 N ug/I 5000 U 5000 U Alkalinity, HCO3 N ug/I 14700 14700 Alkalinity, lab N ug/I 14700 14700 Aluminum D -- ug/I 100 U 100 U Aluminum T 87 ug/I 3300 79 J Antimony D -- -- ug/I 3 2.9 Antimony T 1 5.6 ug/I 4.3 3.1 Arsenic D -- 150 ug/I 32.3 36 Arsenic T 10 10 ug/I 79.4 44.6 Barium D -- -- ug/I 120 120 Barium T 700 1000 ug/I 230 200 Beryllium D -- 6.5 ug/I 0.1 U 0.1 U Beryllium T 4 -- ug/I 3.8 0.39 Boron D -- ug/I 430 430 Boron T 700 -- ug/I 470 50 U Cadmium D -- 0.15 ug/I 0.059 J 0.068 J Cadmium T 2 -- ug/I 0.56 J+ 0.18 J+ Calcium T -- ug/I 20500 19700 Carbon N -- -- ug/I 3400 1400 Chloride N 250000 230000 ug/I 4900 4800 Chromium D -- 11 ug/I 0.2 J+ 0.17 J+ Chromium T 10 -- ug/I 9.7 J+ 1.4 J+ Chromium 6+ T 0.07 ug/I 0.053 J+ 0.041 J+ Cobalt D -- -- ug/I 0.85 0.28 Cobalt T 1 3 ug/I 14.3 2.5 J+ Copper D -- 2.7 ug/I 1.2 J+ 1.4 J+ Copper T 1000 -- ug/I 69.5 7 J+ Iron D -- ug/I 50 U 50 U Iron T 300 -- ug/I 1600 140 Lead D -- 0.54 ug/I 0.1 U 0.1 U Lead T 15 -- ug/I 16.5 2.1 Magnesium T -- ug/I 4060 3890 Manganese D -- ug/I 12 8 Manganese T 50 -- ug/I 48 5 U Mercury T 1 0.012 ug/I 0.0229 0.00116 Methane N -- -- ug/I 1.7 J+ 1.7 J+ Molybdenum D -- ug/I 67.3 66.3 Molybdenum T 160 ug/I 62.8 67 Nickel D -- 16 ug/I 7.8 8.7 Nickel T 100 25 ug/I 29.6 J+ 11.5 J+ Nitrogen, NO2 plus NO3 N -- -- ug/I 20 U 20 U Potassium T ug/I 5130 4940 J Selenium D -- -- ug/I 0.79 0.82 Selenium T 20 5 ug/I 6.7 1.4 Sodium T -- -- ug/I 4210 J 4210 J Strontium D -- ug/I 500 510 Strontium T -- 14000 ug/I 670 1900 Sulfate N 250000 250000 ug/I 60300 60200 Sulfide N -- -- ug/I 100 U 100 U Thallium D -- -- ug/I 0.53 0.57 Thallium T 0.2 0.24 ug/I 1.6 0.69 Total Dissolved Solids N 500000 500000 ug/I 111000 124000 Total Suspended Solids N -- -- ug/I 6110000 49600 Vanadium D -- ug/I 9.4 6.8 Vanadium T 0.3 -- ug/I 63.9 J+ 12.1 J+ Zinc D -- 36 ug/I 3.3 J 3.7 J Zinc T 1000 -- ug/I 39 9.2 J Dissolved Oxygen N -- mg/I 5.4 6 Oxidation Reduction Potential N mV 162.6 157.4 pH N 6.5-8.5 6.0-9.0 SU 7 6.7 Specific Conductivity N I PS/cm 200.6 206 1 of 2 Riverbend Steam Station CSA Supplement 2 Table 3-3: Round 5 Analytical Results of Ash Basin Surface Water Locations Location: SW-1 SW-2 Date: 3/24/2016 3/24/2016 Sample Type: N N Sample Name: RV-SW-1 RV-SW-2 Event: Round 5 Round 5 NCDEQ 02L GWQS, NCDEQ 02B SWQS Constituent Fraction (Class B - Water Unit IMAC, or DHHS Supply) Temperature N Deg C 20.2 16.5 Turbidity, field N NTU 333.3 64.2 45 Exceedance of NCDEQ 02L Groundwater Standards, IMAC, or DHHS criteria. 45 Exceeds NCDEQ 02B Standards for Class B (Water Supply) Criteria. Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter mV = millivolts NTU - nephelometric turbidity units pCi/L = 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 (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 2 of 2 Riverbend Steam Station CSA Supplement 2 Table 3-4: Round 5 Analytical Results of Areas of Wetness Location: Date: Sample Type: Sample Name: Event: S-2 4/20/2016 N RV-S-2 Round 5 S-2 4/20/2016 FD RV-FD-S-2 Round 5 S-4 4/20/2016 N RV-S-4 Round 5 S-6 4/20/2016 N RV-S-6 Round 5 S-7 4/20/2016 N RV-S-7 Round 5 S-8 4/20/2016 N RV-S-8 Round 5 S-9 4/20/2016 N RV-S-9 Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS NCDEQ 02B SWQS (Class B - Water Supply) Unit Alkalinity, CO3 N ug/I 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N ug/I 57800 62700 23100 6300 19500 40900 22700 Alkalinity, lab N ug/I 57800 62700 23100 6300 19500 40900 22700 Aluminum D -- ug/I 100 U 100 U 100 U 100 UJ 100 U 100 U 100 U Aluminum T 87 ug/I 100 U 100 U 80.3 J 100 U 80.7 J 68.8 J 100 U Antimony D -- ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Antimony T 1 5.6 ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Arsenic D -- 150 ug/I 0.085 J 0.059 J 0.062 J 0.043 J 0.041 J 0.12 0.05 J Arsenic T 10 10 ug/I 0.072 J 0.07 J 0.099 J 0.048 J 0.054 J 0.29 0.062 J Barium D -- -- ug/I 31.3 30.8 36.8 43.3 J- 19 15.1 30.8 Barium T 700 1000 ug/I 32.4 33 41.2 46.4 21.1 17.8 33.3 Beryllium D -- 6.5 ug/I 0.1 U 0.1 U 0.027 J+ 0.042 J+ 0.1 U 0.1 U 0.1 U Beryllium T 4 -- ug/I 0.1 U 0.1 U 0.1 U 0.028 J 0.02 J 0.014 J 0.1 U Boron D -- ug/I 474 474 305 139 J- 49.6 J 50 U 320 Boron T 700 -- ug/I 506 503 330 147 52.5 50 U 339 Cadmium D -- 0.15 ug/I 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U Cadmium T 2 -- ug/I 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U Calcium T -- ug/I 42500 42600 8420 3980 2230 7300 7190 Carbon N -- -- ug/I 1000 U 1000 U 510 J 650 J 690 J 1700 1000 U Chloride N 250000 230000 ug/I 6400 6300 5700 5600 5100 1600 5600 Chromium D -- 11 ug/I 0.5 U 0.1 J 0.16 J 0.2 J 1 0.16 J 0.18 J Chromium T 10 -- ug/I 0.094 J+ 0.14 J+ 0.3 J+ 0.31 J+ 1.5 J+ 0.32 J+ 0.3 J+ Chromium 6+ T 0.07 ug/I 0.03 U 0.03 U 0.03 U 0.035 0.9 0.03 U 0.043 Cobalt D -- -- ug/I 3.2 2.8 4.8 6.7 0.86 0.11 1.4 Cobalt T 1 3 ug/I 3.2 3.6 6.1 7.5 1.2 0.29 2.3 Copper D -- 2.7 ug/I 0.52 A J 6.44 J 0.53 0.64 0.66 0.41 J Copper T 1000 -- ug/I 0.48 J 0.43 J 0.37 J 0.16 J 0.37 J 0.87 0.3 J Iron D -- ug/I 41.3 J 36.8 J 247 115 J- 48.1 J 411 38.6 J Iron T 300 ug/I 59.7 74.8 698 260 383 2620 294 Lead D -- 0.54 ug/I 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U Lead T 15 -- ug/I 0.1 U 0.1 U 0.11 0.1 U 0.1 U 0.12 0.1 U Magnesium T -- ug/I 7460 7390 6780 6120 4140 2310 5940 Manganese D -- ug/I 543 535 608 2880 J- 107 25.4 91.9 Manganese T 50 -- ug/I 572 579 707 3100 130 49.9 118 Mercury T 1 0.012 ug/I 0.000604 J+ 0.000731 J+ 0.0024 J+ 0.000523 J+ 0.0012 J+ 0.00174 J+ 0.0075 Methane N -- -- ug/I 10 U 10 U 10 U 10 U 10 U 10 U 10 U Molybdenum D -- ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Molybdenum T 160 ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Nickel D -- 16 ug/I 1 0.85 0.74 8.6 2.5 0.5 U 0.61 Nickel T 100 25 ug/I 0.93 0.97 0.89 9.5 3.1 0.5 U 0.74 Nitrogen, NO2 plus NO3 N -- -- ug/I 230 240 49 20 U 20 U 20 U 83 Potassium T ug/I 4700 J 4640 J 5000 U 5000 U 5000 U 5000 U 5000 U Selenium D -- -- ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 20 5 ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Sodium T -- -- ug/I 5610 5570 6310 6800 2970 J 6260 6540 Strontium D -- ug/I 260 259 48 28.9 J- 17.1 67.4 31.8 Strontium T -- 14000 ug/I 273 272 52.2 30.8 18.4 72.5 33.3 Sulfate N 250000 250000 ug/I 88400 88100 32500 40000 2300J+ 1000 J+ 28100 Sulfide N -- -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- -- ug/I 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U Thallium T 0.2 0.24 ug/I 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U Total Dissolved Solids N 500000 500000 ug/I 194000 177000 83000 92000 51000 79000 76000 Total Suspended Solids N -- -- ug/I 2500 U 2500 U 12800 2500 U 12900 6500 5000 U Vanadium D -- ug/I 0.3 U 0.3 U 0.3 U 0.3 U 0.079 J 0.19 J 0.3 U Vanadium T 0.3 -- ug/I 0.3 U 0.079 J 0.42 0.3 U 0.4 1.2 0.32 Zinc D -- 36 ug/I 10 U 4.1 J+ 5.3 J+ 3.4 J+ 2.6 J+ 10 U 10 U Zinc T 1000 -- ug/I 10 U 10 U 10 U 10 U 10 U 10 U 10 U Dissolved Oxygen N -- mg/I 6.2 6.2 7.4 5.8 8.12 6.5 6.4 Oxidation Reduction Potential N mV 100.7 100.7 62.4 86.1 67.1 85.5 75.5 pH N 6.5 - 8.5 6.0 - 9.0 SU 6.9 6.9 7.6 6.9 7.4 7.2 7 Specific Conductivity N I PS/cm 261 261 96.6 76.2 r 41.6 54.2 78.9 Riverbend Steam Station 1 of 2 CSA Supplement 2 Table 3-4: Round 5 Analytical Results of Areas of Wetness Location: S-2 S-2 S-4 S-6 S-7 S-8 S-9 Date: 4/20/2016 4/20/2016 4/20/2016 4/20/2016 4/20/2016 4/20/2016 4/20/2016 Sample Type: N FD N N N N N Sample Name: RV-S-2 RV-FD-S-2 RV-S-4 RV-S-6 RV-S-7 RV-S-8 RV-S-9 Event: Round 5 Round 5 Round 5 Round 5 Round 5 Round 5 Round 5 NCDEQ 02L NCDEQ 02B SWQS Constituent Fraction GWQS, IMAC, or (Class B - Water Unit DHHS Supply) Temperature N Deg C 17.2 17.2 16.5 19.3 17.8 19.5 17.7 Turbidity, field N NTU 1.3 1.3 5.3 2.9 5.8 10.5 6.9 45 Exceedance of NCDEQ 02L Groundwater Standards, IMAC, or DHHS criteria. 45 Exceeds NCDEQ 02B Standards for Class B (Water Supply) Criteria. Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter mV = millivolts NTU - nephelometric turbidity units pCi/L = 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 (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 Riverbend Steam Station 2 of 2 CSA Supplement 2 Table 3-5: Summary of Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation AB-1D 7/8/2015 719.31 53.11 666.20 9/15/2015 53.87 665.44 6/15/2016 55.80 663.51 AB-1S 7/8/2015 719.30 33.54 685.76 9/15/2015 36.14 683.16 6/15/2016 38.49 680.81 AB-2D 7/9/2015 719.33 40.36 678.97 9/15/2015 41.74 677.59 6/15/2016 45.58 673.75 AB-2S 7/9/2015 719.28 41.70 677.58 9/15/2015 38.86 680.42 6/15/2016 41.28 678.00 AB-3BR 7/8/2015 727.81 144.14 583.67 9/15/2015 44.63 683.18 6/15/2016 28.85 698.96 AB-31D 7/8/2015 727.72 27.52 700.20 9/15/2015 28.64 699.08 6/15/2016 33.89 693.83 AB-3S 7/8/2015 727.78 21.52 706.26 9/15/2015 23.57 704.21 6/15/2016 27.26 700.52 AB-41D 7/9/2015 728.33 25.41 702.92 9/15/2015 27.56 700.77 AB-4S 7/9/2015 728.27 22.13 706.14 9/15/2015 24.49 703.78 AB-51D 7/9/2015 724.46 47.33 677.13 9/15/2015 48.25 676.21 6/15/2016 50.01 674.45 AB-5S 7/9/2015 724.48 16.98 707.50 9/15/2015 20.21 704.27 6/15/2016 22.35 702.13 AB-5SL 7/9/2015 724.49 17.62 706.87 9/15/2015 20.64 703.85 6/15/2016 22.75 701.74 AB-6BRU 7/8/2015 728.51 64.92 663.59 9/15/2015 60.36 668.15 6/15/2016 66.46 662.05 AB-6S 7/8/2015 728.43 41.70 686.73 9/15/2015 43.72 684.71 6/15/2016 43.51 684.92 AB-7D 7/9/2015 729.68 16.20 713.48 9/15/2015 18.35 711.33 6/15/2016 18.241 711.44 7/9/2015 15.691 713.78 Riverbend Steam Station 1 of 7 CSA Supplement 2 Table 3-5: Summary of Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation AB-71 9/15/2015 729.47 17.76 711.71 6/15/2016 74.00 655.47 AB-7S 7/9/2015 729.37 14.95 714.42 9/15/2015 16.94 712.43 6/15/2016 16.92 712.45 AB-81D 7/8/2015 682.46 23.88 658.58 9/15/2015 25.04 657.42 6/15/2016 24.82 657.64 AB-8S 7/8/2015 681.65 25.10 656.55 9/15/2015 26.07 655.58 6/15/2016 25.74 655.91 AS-11D 7/9/2015 766.93 91.55 675.38 9/15/2015 92.93 674.00 AS-1S 7/9/2015 767.44 89.27 678.17 9/15/2015 90.61 676.83 AS-21D 7/9/2015 776.96 81.49 695.47 9/15/2015 82.61 694.35 AS-2S 7/9/2015 776.85 82.76 694.09 9/15/2015 83.73 693.12 AS-31D 7/9/2015 778.58 66.05 712.53 9/15/2015 68.89 709.69 AS-3S 7/9/2015 778.52 65.29 713.23 -- -- -- BG-1D 7/9/2015 704.46 30.02 674.44 9/15/2015 34.40 670.06 6/15/2016 31.40 673.06 BG-1S 7/9/2015 704.22 33.26 670.96 9/15/2015 34.86 669.36 6/15/2016 31.49 672.73 BG-2BR 7/9/2015 705.73 11.90 693.83 9/15/2015 58.11 647.62 6/15/2016 55.40 650.33 BG-2D 7/9/2015 705.36 57.40 647.96 9/15/2015 57.28 648.08 6/15/2016 54.42 650.94 BG-2S 7/9/2015 705.48 53.66 651.82 9/15/2015 56.50 648.98 6/15/2016 53.61 651.87 BG-3D 7/9/2015 674.68 29.831 644.85 9/15/2015 32.851 641.83 Riverbend Steam Station 2 of 7 CSA Supplement 2 Table 3-5: Summary of Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation 6/15/2016 28.93 645.75 BG-3S 7/9/2015 673.89 28.93 644.96 9/15/2015 30.00 643.89 6/15/2016 27.91 645.98 BG-4 B R 708.91 -- -- -- 6/15/2016 170.52 538.39 BG-5BR 719.24 -- -- -- 6/15/2016 37.66 681.58 C-1BRU 7/8/2015 662.23 112.90 549.33 9/15/2015 66.77 595.46 6/15/2016 61.89 600.34 C-is 7/8/2015 663.00 9.69 653.31 9/15/2015 11.20 651.80 6/15/2016 8.94 654.06 C-2D 7/8/2015 684.53 31.06 653.47 9/15/2015 31.90 652.63 6/15/2016 30.33 654.20 C-2S 7/8/2015 684.29 27.86 656.43 9/15/2015 28.90 655.39 6/15/2016 27.08 657.21 GWA-10BRU 7/8/2015 657.57 13.65 643.92 9/15/2015 14.20 643.37 6/15/2016 13.13 644.44 GWA-10S 7/8/2015 658.71 14.92 643.79 9/15/2015 15.25 643.46 6/15/2016 14.42 644.29 GWA-11 D 672.81 -- -- -- 6/15/2016 27.80 645.01 GWA-11S 671.27 -- -- -- 6/15/2016 25.74 645.53 GWA-12 D 685.97 -- -- -- 6/15/2016 23.20 662.77 GWA-12S 685.15 -- -- -- 6/15/2016 24.78 660.37 GWA-14S 779.50 -- -- -- 6/15/2016 64.14 715.36 GWA-11BRU 7/8/2015 696.47 34.40 662.07 9/15/2015 36.05 660.42 6/15/2016 34.44 662.03 Riverbend Steam Station 3 of 7 CSA Supplement 2 Table 3-5: Summary of Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation GWA-1S 7/8/2015 696.23 35.08 661.15 9/15/2015 36.50 659.73 6/15/2016 34.83 661.40 GWA-20BR 738.35 9/15/2015 47.56 690.79 6/15/2016 44.77 693.58 GWA-20D 737.25 9/15/2015 45.06 692.19 6/15/2016 42.78 694.47 GWA-20S 739.05 9/15/2015 45.19 693.86 6/15/2016 42.83 696.22 GWA-22BR-A 763.78 9/15/2015 58.62 705.16 6/15/2016 57.00 706.78 GWA-22D 7/9/2015 761.94 52.65 709.29 9/15/2015 56.21 705.73 6/15/2016 54.75 707.19 GWA-22S 7/9/2015 762.51 49.59 712.92 9/15/2015 53.12 709.39 6/15/2016 52.22 710.29 GWA-23BR 7/9/2015 746.23 42.85 703.38 9/15/2015 47.02 699.21 6/15/2016 43.86 702.37 GWA-23D 7/9/2015 745.94 41.00 704.94 9/15/2015 43.20 702.74 6/15/2016 41.89 704.05 GWA-23S 7/9/2015 745.91 40.02 705.89 9/15/2015 41.91 704.00 6/15/2016 40.84 705.07 GWA-2BR 7/8/2015 689.82 44.58 645.24 9/15/2015 45.20 644.62 6/15/2016 44.30 645.52 GWA-21BRU 689.85 9/15/2015 51.21 638.64 6/15/2016 45.12 644.73 GWA-2S 7/8/2015 689.88 44.75 645.13 9/15/2015 45.53 644.35 6/15/2016 44.46 645.42 GWA-31D 7/8/2015 677.08 31.58 645.50 9/15/2015 32.29 644.79 6/15/2016 30.85 646.23 GWA-3SA 7/8/2015 677.05 31.53 645.52 9/15/2015 32.24 644.81 6/15/20161 1 30.841 646.21 Riverbend Steam Station 4 of 7 CSA Supplement 2 Table 3-5: Summary of Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation GWA-4BR 9/15/2015 695.89 29.74 666.15 6/15/2016 21.33 674.56 GWA-4D 7/10/2015 696.56 22.68 673.88 9/15/2015 27.75 668.81 6/15/2016 23.33 673.23 GWA-4S 7/10/2015 696.35 22.18 674.17 9/15/2015 27.51 668.84 6/15/2016 23.13 673.22 GWA-5D 787.63 9/15/2015 72.06 715.57 6/15/2016 68.22 719.41 GWA-5S 7/9/2015 787.95 77.54 710.41 9/15/2015 77.94 710.01 6/15/2016 64.66 723.29 GWA-6D 7/9/2015 770.06 55.31 714.75 9/15/2015 56.72 713.34 6/15/2016 54.69 715.37 GWA-6S 7/9/2015 770.49 55.01 715.48 9/15/2015 56.45 714.04 6/15/2016 54.41 716.08 GWA-7BR 7/9/2015 688.23 17.22 671.01 9/15/2015 19.88 668.35 6/15/2016 17.76 670.47 GWA-71D 7/9/2015 689.15 18.17 670.98 9/15/2015 20.85 668.30 6/15/2016 18.28 670.87 GWA-7S 7/9/2015 689.24 19.06 670.18 9/15/2015 21.84 667.40 6/15/2016 17.85 671.39 GWA-8D 7/8/2015 689.00 17.92 671.08 9/15/2015 20.08 668.92 6/15/2016 21.76 667.24 GWA-8S 7/8/2015 689.24 17.98 671.26 9/15/2015 27.04 662.20 6/15/2016 22.09 667.15 GWA-9BR 7/8/2015 654.26 112.92 541.34 9/15/2015 112.72 541.54 6/15/2016 109.18 545.08 GWA-9D 7/8/2015 654.69 0.91 653.78 9/15/2015 9.02 645.67 6/15/2016 2.33 652.36 GWA-9S 7/8/2015 654.46 6.22 648.24 9/15/2015 6.53 647.93 6/15/2016 6.88 647.58 MW-10 7/8/20151 654.37 1 10.631 643.74 9/15/20151 1 11.311 643.06 Riverbend Steam Station 5 of 7 CSA Supplement 2 Table 3-5: Summary of Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation 6/15/2016 -- -- MW-11DR 7/8/2015 693.18 28.59 664.59 9/15/2015 30.38 662.80 6/15/2016 -- -- MW-11SR 7/8/2015 693.30 28.62 664.68 9/15/2015 -- -- 6/15/2016 -- -- MW-13 7/8/2015 654.11 11.04 643.07 9/15/2015 11.62 642.49 6/15/2016 -- -- MW-14 7/8/2015 662.84 10.22 652.62 9/15/2015 11.45 651.39 6/15/2016 -- -- MW-15 7/8/2015 657.12 13.38 643.74 9/15/2015 14.14 642.98 6/15/2016 12.80 -- MW-15BR 7/8/2015 656.53 12.58 643.95 9/15/2015 13.27 643.26 6/15/2016 12.13 644.40 MW-15D 7/8/2015 656.69 12.85 643.84 9/15/2015 13.66 643.03 6/15/2016 12.37 644.32 MW-1D 7/8/2015 653.26 3.31 649.95 9/15/2015 4.07 649.19 6/15/2016 3.44 649.82 MW-is 7/8/2015 653.81 1.23 652.58 9/15/2015 1.89 651.92 6/15/2016 1.86 651.95 MW-2D 7/8/2015 715.21 27.82 687.39 9/15/2015 29.66 685.55 6/15/2016 30.82 684.39 MW-2S 7/8/2015 714.49 27.46 687.03 9/15/2015 27.55 686.94 6/15/2016 27.32 687.17 MW-3D 7/8/2015 654.96 2.51 652.45 9/15/2015 3.20 651.76 6/15/2016 3.02 651.94 MW-3S 7/8/2015 655.47 10.41 645.06 9/15/2015 10.65 644.82 6/15/2016 9.93 645.54 MW-4D 7/8/2015 668.38 21.06 647.32 9/15/2015 62.19 606.19 6/15/2016 20.99 647.39 MW-4S 7/8/2015 667.72 19.56 648.16 9/15/2015 19.891 647.83 6/15/20161 19.571 648.15 Riverbend Steam Station 6 of 7 CSA Supplement 2 Table 3-5: Summary of Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation MW-5D 7/8/2015 649.89 2.23 647.66 9/15/2015 3.09 646.80 6/15/2016 2.33 647.56 MW-5S 7/8/2015 649.41 5.86 643.55 9/15/2015 6.13 643.28 6/15/2016 5.39 644.02 MW-6D 7/8/2015 650.80 0.17 650.63 9/15/2015 1.80 649.00 6/15/2016 0.80 650.00 MW-6S 7/8/2015 650.33 0.60 649.73 9/15/2015 2.30 648.03 6/15/2016 1.93 648.40 MW-7BR 7/9/2015 765.80 54.04 711.76 9/15/2015 55.56 710.24 6/15/2016 53.69 712.11 MW-7D 7/9/2015 765.15 53.10 712.05 9/15/2015 54.60 710.55 6/15/2016 52.76 712.39 MW-7SR 7/9/2015 765.43 53.96 711.99 9/15/2015 55.34 710.61 6/15/2016 53.51 711.92 M W-8D 7/9/2015 756.03 50.48 705.55 -- -- -- M W-81 7/9/2015 754.74 47.58 707.16 -- -- -- M W-8S 7/9/2015 755.40 45.54 709.86 -- -- -- MW-9 7/8/2015 651.84 4.10 647.74 9/15/2015 4.71 647.13 6/15/2016 3.75 648.09 MW-9BR 7/8/2015 651.64 2.92 648.72 9/15/2015 3.54 648.10 6/15/2016 2.53 649.11 MW-9D 7/8/2015 651.48 3.55 647.93 9/15/2015 4.14 647.34 6/15/2016 3.18 648.30 OB-1 7/9/2015 749.02 41.27 707.75 9/15/2015 43.49 705.53 OB-2 7/9/2015 723.10 47.12 675.98 9/15/2015 49.40 673.70 Riverbend Steam Station 7 of 7 CSA Supplement 2 Table 3-6: Summary of Cation -Anion Balance Differences Anions Cations Constituent: Molecular Weight (g/mol) Charge Equivalent Weight : Alkalinity, CO3 Alkalinity, HCO3 Chloride Nitrogen, NO2 plus NO3 Sulfate Sum of Anions Calcium Magnesium Potassium Sodium Sum of Cations Charge Balance (%) 60 61 35.5 62 96.1 40.1 24.3 39.1 23 2 1 1 1 2 2 2 1 1 30 61 35.5 62 48.05 20.05 12.15 39.1 23 Site Location Matrix Date Result eq/L Result eq/L Result eq/L Result eq/L Result eq/L eq/L Result eq/L Result eq/L Result eq/L Result eq/L eq/L Riverbend SW-1 Surface Water 3/24/2016 0 0 4.9 0.138 60.3 1.255 20.5 1.022 5.13 0.131 1.67 1.1% 14.7 0.241 0 0 1.634 4.06 0.334 4.21 0.183 SW-2 Surface Water 3/24/2016 0 0 14.7 0.241 4.8 0.135 0 0 60.2 1.253 1.629 19.7 0.983 3.89 0.32 4.94 0.126 4.21 0.183 1.612 -0.5% AB-1 D Groundwater 3/22/2016 307 10.233 11.1 0.182 5.2 0.146 0.015 0 31.1 0.647 11.208 87.9 4.384 0.0603 0.005 62.4 1.596 20.9 0.909 6.894 -23.8% AB-1S Groundwater 3/23/2016 0 0 1 0.016 3.8 0.107 0.76 0.012 0.75 0.016 0.151 0.628 0.031 0.698 0.057 0 0 0 0 0.088 -26.4% AB-21D Groundwater 3/22/2016 0 0 106 1.738 5.5 0.155 0.2 0.003 15.9 0.331 2.227 30.1 1.501 7.61 0.626 0 0 10.4 0.452 2.579 7.3% AB-2S Groundwater 3/22/2016 0 0 6.8 0.111 12.5 0.352 0.31 0.005 37.4 0.778 1.246 1.1 0.055 0.441 0.036 0 0 25.8 1.122 1.213 -1.3% AB-3BR Groundwater 3/23/2016 51.9 1.73 0 0 2.1 0.059 0 0 14.8 0.308 2.097 3.15 0.157 0.0548 0.005 30 0.767 24 1.043 1.972 -3.1 % AB-31D Groundwater 3/23/2016 374 12.467 0 0 7.8 0.22 0.053 0.001 120 2.497 15.185 228 11.372 0 0 150 3.836 111 4.826 20.034 13.8% AB-41D Groundwater 3/23/2016 15.4 0.513 39.9 0.654 2 0.056 0.57 0.009 7.1 0.148 1.38 13.7 0.683 2.2 0.181 6.05 0.155 7.84 0.341 1.36 -0.7% AB-51D Groundwater 3/22/2016 0 0 204 3.344 5 0.141 0.13 0.002 62 1.29 4.777 44.5 2.219 2.11 0.174 70.1 1.793 31.7 1.378 5.564 7.6% AB-6BRU Groundwater 3/22/2016 33 1.1 50.3 0.825 5.5 0.155 0.029 0 95.7 1.992 4.072 39 1.945 9.86 0.812 16.5 0.422 11 0.478 3.657 -5.4% AB-6S Groundwater 3/22/2016 0 0 45.5 0.746 7.9 0.223 0 0 16.1 0.335 1.304 20 0.998 0.59 0.049 0 0 7.98 0.347 1.394 3.3% AB-7D Groundwater 3/22/2016 77.2 2.573 15.9 0.261 3.2 0.09 0.054 0.001 34.3 0.714 3.639 27.7 1.382 0.161 0.013 6.01 0.154 26.9 1.17 2.719 -14.5% AB-71 Groundwater 3/22/2016 0 0 7.5 0.123 2 0.056 0.11 0.002 12 0.25 0.431 1.76 0.088 0.767 0.063 0 0 7.36 0.32 0.471 4.4% AB-81D Groundwater 3/22/2016 0 0 49.1 0.805 5.7 0.161 0.024 0 129 2.685 3.651 46 2.294 11.8 0.971 2.8 0.072 13.2 0.574 3.911 3.4% AB-8S Groundwater 3/22/2016 0 0 5 0.082 5.2 0.146 0.39 0.006 97.6 2.031 2.265 17.7 0.883 11 0.905 0 0 9.14 0.397 2.185 -1.8% BG-1 D Groundwater 3/14/2016 216 7.2 0 0 2.7 0.076 0 0 31.7 0.66 7.936 47.5 2.369 0 0 86.9 2.223 51.9 2.257 6.849 -7.4% BG-1S Groundwater 3/14/2016 0 0 5.5 0.09 1.4 0.039 0.1 0.002 0.76 0.016 0.147 0.588 0.029 1.08 0.089 0 0 0 0 0.118 -10.9% BG-2BR Groundwater 3/14/2016 0 0 99.9 1.638 3.4 0.096 0 0 12.6 0.262 1.996 26.7 1.332 3.32 0.273 3 0.077 13.7 0.596 2.278 6.6% BG-2D Groundwater 3/14/2016 98.6 3.287 0 0 9.5 0.268 1.5 0.024 36.3 0.755 4.334 28 1.397 0.347 0.029 6.01 0.154 37.2 1.617 3.197 -15.1% BG-2S Groundwater 3/14/2016 0 0 30.4 0.498 12.4 0.349 10 0.161 1.7 0.035 1.043 19.6 0.978 3.84 0.316 0 0 9.09 0.395 1.689 23.6% BG-3D Groundwater 3/14/2016 0 0 34.5 0.566 3 0.085 1.9 0.031 1.4 0.029 0.711 7.98 0.398 1.89 0.156 0 0 7.75 0.337 0.891 11.2% BG-3S Groundwater 3/14/2016 0 0 34.9 0.572 2.8 0.079 0 0 1.9 0.04 0.691 7.12 0.355 0.92 0.076 0 0 6.47 0.281 0.712 1.5% BG-5BR Groundwater 4/22/2016 0 0 119 1.951 14.5 0.408 0 0 26.4 0.549 2.908 39.7 1.98 6.6 0.543 5.74 0.147 16.2 0.704 3.374 7.4% C-21D Groundwater 3/23/2016 0 0 120 1.967 2.5 0.07 0.015 0 2.2 0.046 2.083 31.8 1.586 3.94 0.324 0 0 11.6 0.504 2.414 7.4% C-2S Groundwater 3/23/2016 0 0 0 0 3.1 0.087 3.3 0.053 60 1.249 1.389 10.5 0.524 3.98 0.328 7.97 0.204 3.91 0.17 1.226 -6.2% GWA-10BRU Groundwater 3/22/2016 275 9.167 0 0 4.6 0.13 0 0 20.4 0.425 9.722 42.5 2.12 0.446 0.037 114 2.916 39.2 1.704 6.777 -17.8% GWA-10S Groundwater 3/22/2016 0 0 4.1 0.067 6.3 0.177 0 0 34.2 0.712 0.956 4.74 0.236 5.94 0.489 0 0 4.42 0.192 0.917 -2.1% GWA-11 D Groundwater 2/25/2016 0 0 66.8 1.095 19.1 0.538 0.066 0.001 1550 32.258 33.892 410 20.449 104 8.56 9.53 0.244 31.8 1.383 30.636 -5.0% GWA-11S Groundwater 2/23/2016 0 0 104 1.705 6 0.169 0 0 75.6 1.573 3.447 28.6 1.426 10.8 0.889 0 0 11.9 0.517 2.832 -9.8% GWA-12D Groundwater 2/19/2016 0 0 29.7 0.487 3.6 0.101 0.86 0.014 429 8.928 9.53 107 5.337 35.2 2.897 7.18 0.184 27.4 1.191 9.609 0.4% GWA-12S Groundwater 2/26/2016 0 0 0 0 2.6 0.073 0.55 0.009 239 4.974 5.056 54 2.693 19.3 1.588 4.63 0.118 11.4 0.496 4.895 -1.6% GWA-14S Groundwater 3/1/2016 0 0 5.5 0.09 2.8 0.079 0 0 2.1 0.044 0.213 1.31 0.065 0.398 0.033 0 0 3.02 0.131 0.229 3.6% GWA-1BRU Groundwater 3/22/2016 0 0 64.8 1.062 2.2 0.062 0 0 11 0.229 1.353 18.3 0.913 3.39 0.279 2.82 0.072 6.38 0.277 1.541 6.5% GWAAS Groundwater 3/23/2016 0 0 28.9 0.474 5.6 0.158 0.14 0.002 1.4 0.029 0.663 5.7 0.284 2.95 0.243 0 0 5.13 0.223 0.75 6.2% GWA-20BR Groundwater 3/24/2016 77 2.567 141 2.311 2.9 0.082 0 0 19.9 0.414 5.374 39.2 1.955 0.158 0.013 80.2 2.051 31.2 1.357 5.376 0.0% GWA-20D Groundwater 3/24/2016 2260 75.333 238 3.902 14.3 0.403 0 0 9.9 0.206 79.844 733 36.559 0 0 580 14.834 155 6.739 58.132 -15.7% GWA-20S Groundwater 3/22/2016 0 0 3.4 0.056 9.1 0.256 0 0 0.78 0.016 0.328 1.09 0.054 1.11 0.091 0 0 4.23 0.184 0.329 0.2% GWA-21 BR Groundwater 3/24/2016 426 14.2 80.1 1.313 4.1 0.115 0 0 9.3 0.194 15.822 83 4.14 0.111 0.009 70.2 1.795 87.9 3.822 9.766 -23.7% GWA-21D Groundwater 3/24/2016 0 0 78 1.279 3 0.085 0 0 18.8 0.391 1.755 18.2 0.908 2.97 0.244 13.8 0.353 13.9 0.604 2.109 9.2% GWA-21S Groundwater 3/24/2016 0 0 0 0 2.2 0.062 1.1 0.018 0 0 0.08 0.364 0.018 0.151 0.012 0 0 2.53 0.11 0.14 27.3% GWA-22BR-A Groundwater 3/23/2016 5.4 0.18 53 0.869 4.9 0.138 0 0 32.6 0.678 1.865 18 0.898 1.42 0.117 2.83 0.072 19.5 0.848 1.935 1.8% GWA-22D Groundwater 3/23/2016 0 0 33.9 0.556 NA* 0.068 0.001 NA* 6.22 0.31 0.576 0.047 0 0 8.8 0.383 0.74 -- GWA-22S Groundwater 3/23/2016 0 0 2.2 0.036 3.3 0.093 0.028 0 0 0 0.129 0.578 0.029 0.415 0.034 0 0 0 0 0.063 -34.4% GWA-23BR Groundwater 3/23/2016 480 16 0 0 2.4 0.068 0 0 8.4 0.175 16.243 153 7.631 0.111 0.009 72.9 1.864 36.8 1.6 11.104 -18.8% GWA-23D Groundwater 3/23/2016 95.9 3.197 0 0 2.3 0.065 0 0 7.3 0.152 3.414 31.9 1.591 0.143 0.012 13.1 0.335 15.1 0.657 2.595 -13.6% GWA-23S Groundwater 3/22/20161 0 0 5.8 0.095 2.4 0.068 0.41 0.007 0.79 0.016 0.186 1.07 0.053 0.443 0.036 0 0 0 0 0.089 -35.3% GWA-2BR Groundwater 3/23/2016 0 0 71.4 1.17 5.1 0.144 0 0 39.6 0.824 2.138 32.3 1.611 5.55+O457 1 6.76 0.173 9.23 0.401 2.642 10.5% Riverbend Steam Station 1 of 3 CSA Supplement 2 Table 3-6: Summary of Cation -Anion Balance Differences Anions Cations Constituent: Molecular Weight (g/mol) Charge Equivalent Weight : Alkalinity, CO3 Alkalinity, HCO3 Chloride Nitrogen, NO2 plus NO3 Sulfate Sum of Anions Calcium Magnesium Potassium Sodium Sum of Cations Charge Balance (%) 60 61 35.5 62 96.1 40.1 24.3 39.1 23 2 1 1 1 2 2 2 1 1 30 61 35.5 62 48.05 20.05 12.15 39.1 23 Site Location Matrix Date Result eq/L Result eq/L Result eq/L Result eq/L Result eq/L eq/L Result eq/L Result eq/L Result eq/L Result eq/L eq/L GWA-2BRU Groundwater 3/24/2016 NA" NA" NA" 5.8 0.163 0.063 0.001 NA' 35.7 0.743 1.381 96.8 1 4.828 0 0 122 3.12 77.5 3.37 11.318 - 2.1% GWA-2S Groundwater 3/23/2016 0 0 28.6 0.469 0.37 0.006 12.5 0.623 6.91 0.569 0 0 5.73 0.249 1.441 GWA-31D Groundwater 3/24/2016 0 0 88.1 1.444 6.2 0.175 0 0 1580 32.882 34.501 440 21.945 143 11.77 10.7 0.274 49.9 2.17 36.159 2.3% GWA-3S-A Groundwater 3/24/2016 0 0 31.3 0.513 5.9 0.166 0 0 1580 32.882 33.561 407 20.299 152 12.51 8.78 0.225 42 1.826 34.86 1.9% GWA-4BR Groundwater 3/23/2016 324 10.8 126 2.066 3.3 0.093 0 0 17.4 0.362 13.321 152 7.581 0 0 31.7 0.811 26.2 1.139 9.531 -16.6% GWA-41D Groundwater 3/23/2016 156 5.2 0 0 3.6 0.101 0.01 0 8.9 0.185 5.486 16 0.798 0.192 0.016 0 0 60.7 2.639 3.453 -22.7% GWA-4S Groundwater 3/23/2016 0 0 6 0.098 11.3 0.318 0.023 0 394 8.2 8.616 67.8 3.382 43 3.539 0 0 6.96 0.303 7.224 -8.8% GWA-51D Groundwater 3/24/2016 17.9 0.597 49.4 0.81 2.3 0.065 0 0 7.6 0.158 1.63 23.4 1.167 1.07 0.088 0 0 10.8 0.47 1.725 2.8% GWA-61D Groundwater 3/23/2016 0 0 174 2.852 3 0.085 0 0 14.8 0.308 3.245 70 3.491 0.0809 0.007 2.64 0.068 8.24 0.358 3.924 9.5% GWA-6S Groundwater 3/23/2016 0 0 9.8 0.161 2.1 0.059 0.061 0.001 0.75 0.016 0.237 1.39 0.069 0.763 0.063 0 0 0 0 0.132 -28.5% GWA-7BR Groundwater 3/23/2016 0 0 82.2 1.348 3.1 0.087 0.11 0.002 4.4 0.092 1.529 18.8 0.938 7.13 0.587 0 0 5.42 0.236 1.761 7.1 % GWA-7D Groundwater 3/23/2016 0 0 80.8 1.325 2.9 0.082 0.098 0.002 4.5 0.094 1.503 18.8 0.938 5.8 0.477 0 0 7.4 0.322 1.737 7.2% GWA-7S Groundwater 3/23/2016 0 0 31.1 0.51 3.8 0.107 0 0 0 0 0.617 6.22 0.31 4.38 0.36 0 0 0 0 0.67 4.1% GWA-81D Groundwater 3/22/2016 0 0 42.5 0.697 6 0.169 0 0 24.5 0.51 1.376 11.6 0.579 8.8 0.724 0 0 4.5 0.196 1.499 4.3% GWA-8S Groundwater 3/23/2016 0 0 0 0 5.4 0.152 4.5 0.073 39 0.812 1.037 1.8 0.09 6.16 0.507 3.68 0.094 6.41 0.279 0.97 -3.3% GWA-9D Groundwater 3/23/2016 0 0 23.3 0.382 6.3 0.177 0 0 32.9 0.685 1.244 10.2 0.509 5.76 0.474 0 0 6.92 0.301 1.284 1.6% GWA-9S Groundwater 3/23/2016 0 0 0 0 5.7 0.161 0.21 0.003 25.5 0.531 0.695 2.01 0.1 2.68 0.221 0 0 5.75 0.25 0.571 -9.8% MW-15BR Groundwater 3/23/2016 0 0 4 0.066 6.6 0.186 0.048 0.001 28.6 0.595 0.848 3.54 0.177 2.92 0.24 0 0 9.79 0.426 0.843 -0.3% MW-15D Groundwater 3/23/2016 104 3.467 81.8 1.341 7.7 0.217 0 0 35.3 0.735 5.76 22.6 1.127 0.168 0.014 51.4 1.315 76.7 3.335 5.791 0.3% MW-1 D Groundwater 3/22/2016 0 0 19.2 0.315 6.4 0.18 0 0 93.2 1.94 2.435 24.7 1.232 8.22 0.677 0 0 9.39 0.408 2.317 -2.5% MW-1S Groundwater 3/22/2016 0 0 20.3 0.333 8.9 0.251 0 0 1 0.021 0.605 1.99 0.099 0.991 0.082 0 0 5.92 0.257 0.438 -16.0% MW-2D Groundwater 3/22/2016 0 0 38.9 0.638 2.9 0.082 0.054 0.001 1.1 0.023 0.744 6.15 0.307 3.64 0.3 0 0 5.35 0.233 0.84 6.1 % MW-2S Groundwater 3/22/2016 0 0 0 0 6.3 0.177 0.19 0.003 51.7 1.076 1.256 9.91 0.494 1.98 0.163 5.04 0.129 6.61 0.287 1.073 -7.9% MW-3D Groundwater 3/22/2016 0 0 54.8 0.898 6.4 0.18 0.06 0.001 26.4 0.549 1.628 17 0.848 8.84 0.728 0 0 3.91 0.17 1.746 3.5% MW-3S Groundwater 3/22/2016 0 0 56 0.918 6 0.169 0 0 28.3 0.589 1.676 16.7 0.833 9.79 0.806 0 0 3.91 0.17 1.809 3.8% MW-4D Groundwater 3/22/2016 0 0 16.1 0.264 5.6 0.158 0.033 0.001 31.8 0.662 1.085 10.5 0.524 3.48 0.286 0 0 7.25 0.315 1.125 1.8% MW-4S Groundwater 3/22/2016 0 0 12.1 0.198 6.2 0.175 0.11 0.002 26.8 0.558 0.933 5.87 0.293 5.03 0.414 0 0 6.89 0.3 1.007 3.8% MW-5D Groundwater 3/22/2016 0 0 72.2 1.184 6.5 0.183 0.14 0.002 44.8 0.932 2.301 23.2 1.157 11.9 0.979 0 0 7.97 0.347 2.483 3.8% MW-5S Groundwater 3/22/2016 0 0 4.6 0.075 7.4 0.208 0.049 0.001 14.5 0.302 0.586 0.881 0.044 0.85 0.07 0 0 11.4 0.496 0.61 2.0% MW-6D Groundwater 3/22/2016 0 0 31.3 0.513 6.6 0.186 0 0 35.9 0.747 1.446 13.2 0.658 6.34 0.522 0 0 6.31 0.274 1.454 0.3% MW-6S Groundwater 3/22/2016 0 0 21 0.344 6.7 0.189 0 0 38.4 0.799 1.332 10.6 0.529 6.27 0.516 0 0 6.89 0.3 1.345 0.5% MW-7BR Groundwater 3/28/2016 251 8.367 0 0 4.6 0.13 0.015 0 5.5 0.114 8.611 483 24.09 0 0 16.2 0.414 28.7 1.248 25.752 49.9% MW-7D Groundwater 3/23/2016 0 0 17.5 0.287 1.4 0.039 0 0 0 0 0.326 2.62 0.131 0.944 0.078 0 0 3.57 0.155 0.364 5.5% MW-9BR Groundwater 3/22/2016 361 12.033 38.2 0.626 3.4 0.096 0.24 0.004 15.7 0.327 13.086 145 7.232 0.301 0.025 13.2 0.338 13.9 0.604 8.199 -23.0% MW-9D Groundwater 3/22/2016 79.9 2.663 0 0 2.6 0.073 0.52 0.008 37.4 0.778 3.522 46.2 2.304 0.254 0.021 3.6 0.092 13.8 0.6 3.017 -7.7% S-2 AOW 4/20/2016 0 0 57.8 0.948 6.4 0.18 0.23 0.004 88.4 1.84 2.972 42.5 2.12 7.46 0.614 4.7 0.12 5.61 0.244 3.098 2.1 % S-4 AOW 4/20/2016 0 0 23.1 0.379 5.7 0.161 0.049 0.001 32.5 0.676 1.217 8.42 0.42 6.78 0.558 0 0 6.31 0.274 1.252 1.4% S-6 AOW 4/20/2016 0 0 6.3 0.103 5.6 0.158 0 0 40 0.832 1.093 3.98 0.199 6.12 0.504 0 0 6.8 0.296 0.999 -4.5% S-7 AOW 4/20/2016 0 0 19.5 0.32 5.1 0.144 0 0 2.3 0.048 0.512 2.23 0.111 4.14 0.341 0 0 2.97 0.129 0.581 6.3% S-8 AOW 4/20/2016 0 0 40.9 0.67 1.6 0.045 0 0 1 0.021 0.736 7.3 0.364 2.31 0.19 0 0 6.26 0.272 0.826 5.8% S-9 AOW 4/20/2016 0 0 22.7 0.372 5.6 0.158 0.083 0.001 28.1 0.585 1.116 7.19 0.359 5.94 0.489 0 0 6.54 0.284 1.132 0.7% AB-3S Porewater 3/23/2016 0 0 66.9 1.097 7.1 0.2 0 0 60.3 1.255 2.552 32 1.596 6.96 0.573 6.86 0.175 7.26 0.316 2.66 2.1 % AB-4S Porewater 3/23/2016 0 0 45.6 0.748 5.3 0.149 0.011 0 90.8 1.89 2.787 31.2 1.556 5.39 0.444 11.5 0.294 12.9 0.561 2.855 1.2% AB-5S Porewater 3/22/2016 0 0 309 5.066 9.3 0.262 0.023 0 143 2.976 8.304 124 6.185 23.9 1.967 17.2 0.44 13 0.565 9.157 4.9% AB-5SL Porewater 3/22/2016 40.4 1.347 18.7 0.307 7.2 0.203 0 0 165 3.434 5.291 68.9 3.436 1.12 0.092 17 0.435 7.88 0.343 4.306 -10.3% AB-7S Porewater 3/22/2016 0 0 86.5 1.418 4.7 0.132 0 0 38.4 0.799 2.349 24.5 1.222 5.28 0.435 13.7 0.35 8.06 0.35 2.357 0.2% C-1 S Porewater 3/24/20161 0 0 0 0 7.7 0.217 0 0 410 8.533 8.75 46 2.294 17.2 1.416 19 0.486 26.8 1.165 5.361 -24.0% Riverbend Steam Station 2 of 3 CSA Supplement 2 Table 3-6: Summary of Cation -Anion Balance Differences Anions Cations Alkalinity, CO3 Alkalinity, HCO3 Chloride Nitrogen, NO2 plus NO3 Sulfate Calcium Magnesium Potassium Sodium Constituent: Molecular Weight (g/mol) SUM of Anions SUM of Cations Charge 60 61 35.5 62 96.1 40.1 24.3 39.1 23 2 1 1 1 2 2 2 1 1 Charge Balance 30 61 35.5 62 48.05 20.05 12.15 39.1 23 Equivalent Weight: N Site Location Matrix Date Result I eq/L I Result I eq/L Result eq/L I Result I eq/L I Result I eq/L I eq/L I Result I eq/L I Result I eq/L I Result I eq/L I Result I eq/L I eq/L * NO2 + NO3 is being used as a surrogate for nitrate and the molecular weight of nitrate is assumed. " GWA-22D: Sample not analyzed for chloride and sulfate. ** GWA-2BRU: Sample not analyzed for alkalinity (carbonate / bicarbonate), chloride, or sulfate. Results of "0" are reported as non -detects by the analytical laboratory. Dataset consists of aqueous data associated with the first quarter of 2016 (even if dates do not align to traditional quarters). Formulas: Molecular Weight 9 Result Value mg e e g mod ( L) E Cations ( q) — E Anions( q) Equivalent Weight = eq�I = g CBE% = eQ eQ x 100 Charge (MolecuLarWt.(maL)\ E CationsO+E Anions( ) l Charge 1 Riverbend Steam Station 3 of 3 CSA Supplement 2