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Home My WebLink AboutNC0003468_FINAL_CSA Supplement 2_Tables_20160901Table 1-1: Well Construction Information � AB -10D Deep 998,242.10 1,790,151.29 • 539.42 -0.24 .- PVC � 6.00 ... 76.76 :. 81.76 �•. 82.06 � .• CAMA AB -105 Shallow 998,236.25 1,790,162.14 539.44 -0.21 PVC 2.00 14.79 29.79 30.09 CAMA AB -105L Shallow 998,239.00 1,790,156.71 539.42 -0.23 PVC 2.00 42.77 47.77 48.07 CAMA AB-25BR Bedrock 997,115.84 1,789,347.53 542.90 3.47 PVC 6.00 147.47 152.47 152.77 CAMA AB -25D Deep 997,125.35 1,789,342.44 542.97 3.50 PVC 6.00 85.50 90.50 90.80 CAMA AB -255 Shallow 997,120.65 1,789,345.13 542.87 3.50 PVC 2.00 33.50 48.50 48.80 CAMA AB -306R Bedrock 998,591.70 1,790,574.71 529.27 -0.36 PVC 6.00 108.64 113.64 113.94 CAMA AB -30D Deep 998,595.59 1,790,579.24 529.47 -0.20 PVC 6.00 53.80 58.80 59.10 CAMA AB -30S Shallow 998,587.83 1,790,570.11 529.34 -0.33 PVC 2.00 14.67 29.67 29.97 LAMA AB -356R Bedrock 998,491.99 1,789,841.10 531.99 3.24 PVC 6.00 84.24 89.24 89.54 CAMA AB -5D Deep 998,532.83 1,789,632.52 533.85 -0.54 PVC 6.00 33.46 38.46 38.76 CAMA AB -5S Shallow 998,527.31 1,789,629.93 534.00 -0.21 PVC 2.00 6.79 21.79 22.09 CAMA AS -10D Deep 1,000,088.72 1,789,105.34 591,84 2.95 PVC 6.00 40.95 45.95 46.25 CAMA AS -12S Shallow 999,538.00 1,789,125.21 559.70 2.70 PVC 2.00 16.60 26.60 26.90 CAMA AS -2D Deep 998,949.19 1,789,509.52 561.00 0.32 PVC 6.00 53.32 58.32 58.62 CAMA AS -4D Deep 999,349.09 1,789,893.62 562.17 2.95 PVC 6.00 37.95 42.95 43.25 CAMA AS -6D Deep 999,920.17 1,790,294.53 586.66 2.38 PVC 6.00 58.38 63.38 63.68 CAMA AS-8BR Bedrock 999,114.48 1,788,805.77 582.10 2.81 PVC 6.00 66.81 71.81 72.11 CAMA AS -8D Deep 999,117.58 1,788,800.25 582.23 2.93 PVC 6.00 50.93 54.93 55.23 CAMA BG-10BR Bedrock 1,001,770.23 1,788,864.38 598.59 2.90 PVC 5.00 12.90 27.90 28.40 CAMA BG -10D Deep 1,001,784.82 1,788,861.54 598.80 2.60 PVC 5.00 51.60 56.60 57.60 CAMA BG -10S Shallow 1,001,777.52 1,788,864.43 598.63 2.58 PVC 2.00 16.58 26.58 26.58 CAMA BG -1D Deep 996,161.15 1,787,032.17 516.40 3.11 PVC 6.00 12.11 17.11 17.41 CAMA BG -5D Deep 997,916.65 1,786,620.37 514.91 2.97 PVC 6.00 30.97 35.97 36.27 CAMA BG -5S Shallow 997,916.91 1,786,625.44 515.24 2.98 PVC 2.00 13.48 23.48 23.78 LAMA GWA-10D Deep 998,655.43 1,789,232.00 553.56 3.37 PVC 6.00 36.37 41.37 41.67 CAMA GWA-10S Shallow 998,657.98 1,789,234.51 553.40 3.35 PVC 2.00 16.35 31.35 31.65 CAMA GWA-11D Deep 999,356.24 1,790,099.35 559.77 2.65 PVC 6.00 32.15 37.15 37.45 CAMA GWA-11S Shallow 999,363.84 1,790,106.50 560.13 2.58 PVC 2.00 12.58 27.58 27.88 CAMA GWA-12D Deep 999,365.57 1,787,175.72 584.45 2.39 PVC 6.00 29.39 34.39 34.69 CAMA GWA-12S Shallow 999,359.01 1,787,185.58 584.90 2.37 PVC 2.00 7.87 17.87 18.17 CAMA Dan River Steam Station Page 1 of 3 CSA Supplement 2 Table 1-1: Well Construction Information � GWA-14D Deep 999,204.02 1,791,063.31 • 500.19 3.49 PVC � 6.00 ... 14.99 :. 19.99 �• 20.29 .• CAMA GWA-14S Shallow 999,208.41 1,791,059.29 499.97 3.43 PVC 2.00 6.43 11.43 11.73 CAMA GWA-15D Deep 998,903.87 1,791,130.13 504.13 2.87 PVC 6.00 28.87 33.87 34.17 CAMA GWA-15S Shallow 998,906.19 1,791,125.43 504.21 3.25 PVC 2.00 10.75 15.75 16.05 CAMA GWA-16D Deep 998,974.48 1,791,302.00 504.73 2.55 PVC 5.00 31.55 36.55 41.95 CAMA GWA-16S Shallow 998,967.20 1,791,301.94 504.45 2.55 PVC 2.00 45.55 50.55 50.55 CAMA GWA-17D Deep 999,390.61 1,791,157.97 513.97 2.46 PVC 6.00 32.26 42.26 42.46 CAMA GWA-18D Deep 1,000,526.88 1,790,110.70 598.03 3.15 PVC 5.00 40.15 45.15 52.65 CAMA GWA-1D Deep 1,000,435.36 1,789,501.26 601.58 2.77 PVC 6.00 116.77 121.77 122.07 CAMA GWA-1S Shallow 1,000,434.35 1,789,508.44 601.39 2.56 PVC 2.00 32.56 47.56 47.86 CAMA GWA-20D Deep 996,631.63 1,789,494.63 511.95 2.93 PVC 5.00 26.93 31.93 31.93 CAMA GWA-20S Shallow 996,635.21 1,789,503.48 511.97 3.11 PVC 2.00 78.11 83.11 92.61 CAMA GWA-2D Deep 1,000,194.10 1,790,144.67 588.04 2.99 PVC 6.00 58.99 63.99 51.29 CAMA GWA-2S Shallow 1,000,192.16 1,790,142.81 587.57 2.60 PVC 2.00 18.60 33.60 33.90 CAMA GWA-3D Deep 999,722.04 1,790,325.37 574.04 2.56 PVC 6.00 36.56 41.56 41.86 CAMA GWA-3S Shallow 999,728.33 1,790,326.70 573.98 2.57 PVC 2.00 16.37 26.37 26.67 CAMA GWA-4D Deep 999,178.35 1,790,848.08 527.20 3.11 PVC 6.00 46.11 51.11 51.41 CAMA GWA-4S Shallow 999,175.11 1,790,843.57 527.87 3.22 PVC 2.00 23.22 38.22 38.52 CAMA GWA-SBR Bedrock 998,980.57 1,790,987.79 499.73 2.62 PVC 6.00 57.62 62.62 62.92 CAMA GWA-56RD Bedrock 998,976.82 1,790,975.67 502.14 2.54 PVC 5.00 121.54 131.54 133.04 CAMA GWA-6D Deep 996,688.51 1,788,738.25 501.20 -0.75 PVC 6.00 28.25 33.25 33.55 CAMA GWA-6S Shallow 996,691.58 1,788,742.74 501.48 -0.38 PVC 2.00 8.62 18.62 18.92 CAMA GWA-7D Deep 997,799.45 1,788,525.83 543.48 -0.25 PVC 6.00 45.75 50.75 51.05 CAMA GWA-7S Shallow 997,794.84 1,788,530.11 543.16 -0.21 PVC 2.00 13.79 28.79 29.09 CAMA GWA-8D Deep 999,245.07 1,787,875.93 584.01 2.18 PVC 6.00 37.18 42.18 42.48 CAMA GWA-8S Shallow 999,235.78 1,787,879.43 583.87 2.37 PVC 2.00 8.37 23.37 23.67 CAMA GWA-9D Deep 999,897.79 1,788,173.35 611.30 2.89 PVC 6.00 69.89 74.89 75.19 CAMA GWA-9S Shallow 999,892.13 1,788,170.76 611.72 2.85 PVC 2.00 34.85 49.85 50.15 CAMA MW-22BR Bedrock 996,924.87 1,789,281.96 502.32 -0.29 PVC 6.00 57.71 62.71 63.01 CAMA MW-23BR Bedrock 999,334.89 1,786,362.59 527.55 3.09 PVC 6.00 59.09 64.09 64.39 CAMA MW-301BR Bedrock 1,000,085.21 1,789,724.76 593.55 3.21 PVC 6.00 40.21 45.21 45.51 CAMA Dan River Steam Station Page 2 of 3 CSA Supplement 2 Table 1-1: Well Construction Information � MW -3036R Bedrock 999,827.79 1,789,669.99 • 651.37 3.01 PVC � 6.00 ... 140.01 :. 145.01 �- 145.31 .• CAMA MW-306BR Bedrock 999,376.35 1,789,631.22 613.62 2.16 PVC 6.00 104.16 109.16 109.46 CAMA MW -3086R Bedrock 998,649.51 1,789,689.61 532.59 2.13 PVC 6.00 79.13 84.13 84.43 CAMA MW -3106R Bedrock 998,350.66 1,789,395.72 538.91 -0.21 PVC 6.00 72.79 77.79 78.09 CAMA MW-311BR Bedrock 997,715.07 1,789,922.08 537.73 1.52 PVC 6.00 121.52 126.52 126.82 CAMA MW-314BR Bedrock 997,645.78 1,789,069.26 539.75 -0.31 PVC 6.00 68.69 73.69 73.99 CAMA MW-315BR Bedrock 998,707.13 1,789,080.45 570.75 3.23 PVC 6.00 62.93 77.93 78.23 CAMA MW-317BR Bedrock 999,122.87 1,788,315.51 571.93 2.19 PVC 6.00 85.19 90.19 90.49 CAMA MW-317BRL Bedrock 999,057.59 1,788,356.71 571.20 2.81 PVC 5.00 181.81 191.81 192.61 CAMA MW -318D Deep 999,066.81 1,789,127.52 567.21 2.62 PVC 6.00 47.12 52.12 62.42 CAMA MW -20D Deep 1,000,692.00 1,788,923.00 562.23 2.81 PVC 2.00 2.81 2.81 562.23 NPDES MW -20S Shallow 1,000,691.00 1,788,918.00 562.28 2.57 PVC 2.00 2.57 2.57 562.28 NPDES MW -21D Deep 998,974.10 1,790,996.00 498.90 2.67 PVC 2.00 2.67 2.67 498.90 NPDES MW -21S Shallow 998,981.00 1,790,997.00 498.80 2.77 PVC 2.00 2.77 2.77 498.80 NPDES MW -22D Deep 996,920.10 1,789,299.00 505.19 2.97 PVC 2.00 2.97 2.97 505.19 NPDES MW -22S Shallow 996,917.40 1,789,292.00 504.52 2.47 PVC 2.00 2.47 2.47 504.52 NPDES MW -23D Deep 999,330.00 1,786,366.00 528.22 3.24 PVC 2.00 3.24 3.24 528.22 NPDES MW -10 Shallow 998,048.00 1,790,251.00 531.81 1.93 PVC 2.00 1.93 1.93 531.81 Voluntary MW -10D Deep 998,048.00 1,790,251.00 531.80 1.92 PVC 2.00 1.92 1.92 531,80 Voluntary MW -11 Shallow 998,664.00 1,790,698.00 531.16 1.99 PVC 2.00 1.99 1.99 531.16 Voluntary MW -11D Deep 998,664.00 1,790,698.00 531.16 1.99 PVC 2.00 1.99 1.99 531.16 Voluntary MW -12 Shallow 1,000,285.00 1,788,797.00 593.59 2.88 PVC 2.00 2.88 2.88 593.59 Voluntary MW -12D Deep 1,000,275.00 1,788,794.00 593.23 2.44 PVC 2.00 2.44 Z.44 593.23 Voluntary MW -9 Shallow 996,925.00 1,789,106.00 526.41 2.14 PVC 2.00 2.14 2.14 526.41 Voluntary MW -9D Deep 996,920.00 1,789,097.00 527.04 2.35 PVC 2.00 2.35 2.35 527.04 Voluntary 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. Deep and Bedrock CAMA wells installed with 2 -inch riser; Casing value listed for D/BR wells indicates outer casing diameter Dan River Steam Station Page 3 of 3 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells M W-9 NCAC 2L Standard: Units: 11/29/1993 NS °C 17 NS NS mV µi2/cm -- 398 NS 6.5 - 8.5 mg/L SU -- 6.1 500 mg/L -- 10 mg/L -- 250 mg/L -- MW-9 4/4/1994 15.6 -- 482 -- 6 -- -- -- MW-9 5/23/1994 16.2 -- 449 -- 6 -- -- -- M W-9 11/28/1994 17.2 -- 517 -- 6 -- -- -- M W-9 5/8/1995 15.9 -- 504 -- 6.3 -- -- -- M W-9 11/28/1995 17.9 -- 506 -- 6.2 -- -- -- MW-9 4/18/1996 16.4 -- 530 -- 6 -- -- -- M W-9 10/17/1996 17.6 -- 530 -- 6.2 -- -- -- MW-9 4/17/1997 14.7 -- 544 -- 6.2 -- -- -- M W-9 10/15/1997 16.5 -- 569 -- 6.2 -- -- -- MW-9 4/21/1998 15.3 -- 633 -- 6.1 -- -- -- M W-9 10/27/1998 18.2 -- 543 -- 6.2 -- -- -- MW-9 4/6/1999 15.7 -- 552.1 -- 6.1 -- -- -- M W-9 10/28/1999 17.7 -- 548.2 -- 6 -- -- -- MW-9 4/10/2000 18.82 -- 586 -- 6.1 -- -- 28.8 MW -9 10/11/2000 23 -- 576 -- 5.9 -- -- 29.28 MW -9 4/23/2001 18.4 -- 545 -- 6 -- -- -- M W-9 10/8/2001 20.96 -- 526 -- 5.97 -- -- 27.75 MW -9 4/22/2002 18 -- 526 -- 6.3 -- -- 28.26 M W-9 10/17/2002 19.03 -- 537 -- 6.3 -- -- 27.6 M W-9 4/22/2003 16 -- 567 -- 6.1 -- -- 27.3 M W-9 10/15/2003 18.44 -- 524.3 -- 6.17 -- -- 28.7 M W-9 4/15/2004 17 -- 529 -- 6.4 -- -- 32.6 M W-9 10/6/2004 18 -- 524 -- 6.2 -- -- 29.3 MW -9 4/27/2005 16 -- 558 -- 6.3 -- -- 26.61 M W-9 10/19/2005 18.63 -- 527 -- 6.28 -- -- 25.4 MW -9 4/11/2006 15.51 -- 528 -- 6.28 -- -- 25.2 M W-9 10/25/2006 16.36 -- 513 -- 6.25 -- -- 22.77 MW -9 4/11/2007 14.08 -- 530.1 -- 6.26 -- -- 21.44 M W-9 10/22/2007 19.3 -- 446.2 -- 5.95 -- -- 22.09 MW -9 4/21/2008 15.65 -- 483.4 -- 6.22 -- -- 23 M W-9 10/13/2008 18.33 -- 490 -- 6.15 -- -- 29 MW -9 4/14/2009 15.61 -- 474.4 -- 6.36 -- -- 23 M W-9 10/21/2009 17.95 -- 475.4 -- 6.36 -- -- 26 MW -9 M W-9 MW -9 MW -9 MW -9D MW -9D 4/7/2010 10/6/2010 1/4/2011 5/5/2011 4/21/2008 10/13/2008 17.29 17.88 16.38 16.84 16.91 17.78 -- 477.1 -- 457.1 -- 521 -- 506 -- 382.7 -- 376.9 -- 6.25 -- 6.24 -- 6.45 -- 6.44 -- 6.58 -- 6.45 -- -- 267 300 -- -- -- -- <0.02 0.02 -- -- 23 27 28 26 30 38 MW -9D 4/14/2009 17.11 -- 376.9 -- 6.57 -- -- 34 MW -9D 10/21/2009 17.19 -- 386.5 -- 6.63 -- -- 35 MW -9D 4/7/2010 18.03 -- 371.1 -- 6.5 -- -- 29 MW -9D 10/6/2010 17.17 -- 351.8 -- 6.59 -- -- 27 MW -9D 1/4/2011 16.4 -- 351 -- 6.57 204 <0.02 25 MW -9D 5/5/2011 17.67 -- 338 -- 6.53 230 <0.023 21 MW -9D 9/7/2011 17.5 -- 332 -- 6.39 _ 230 0.04 20 M W-10 11/29/1993 14.5 -- 266 -- 6.8 _ -- -- -- MW-10 4/4/1994 15.1 -- 290 -- 6.7 -- -- -- MW-10 5/23/1994 15.3 -- 294 -- 6.7 -- -- -- M W-10 11/28/1994 16.4 -- 291 -- 5.2 -- -- -- Dan River Steam Station Page 1 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells MW -10 NCAC 2L Standard: Units: 5/8/1995 NS °C 14.7 NS NS mV µi2/cm -- 333 NS 6.5 - 8.5 mg/L SU -- 5.6 500 mg/L -- 10 mg/L -- 250 mg/L -- M W-10 11/28/1995 16.6 -- 290 -- 5.7 -- -- -- MW-10 4/18/1996 13.8 -- 317 -- 5.7 -- -- -- M W-10 10/17/1996 17.8 -- 292 -- 5.8 -- -- -- MW-10 4/17/1997 13.4 -- 297 -- 6 -- -- -- M W-10 10/15/1997 17.2 -- 291 -- 6 -- -- -- MW-10 4/21/1998 13.4 -- 328 -- 5.8 -- -- -- M W-10 10/27/1998 18.3 -- 439 -- 6.3 -- -- -- MW-10 4/6/1999 13.6 -- 438 -- 6 -- -- -- M W-10 10/28/1999 18.5 -- 393.8 -- 5.8 -- -- -- MW-10 4/10/2000 15.77 -- 387 -- 5.8 -- -- 41.6 MW -10 10/11/2000 21 -- 368 -- 5.6 -- -- 39.25 MW -10 4/23/2001 15.1 -- 376 -- 5.8 -- -- -- M W-10 10/8/2001 23.26 -- 449 -- 6 -- -- 34.99 MW -10 4/22/2002 16 -- 379 -- 6.2 -- -- 29.26 M W-10 10/17/2002 19.02 -- 372 -- 6.19 -- -- 27.37 MW -10 4/22/2003 15 -- 399.3 -- 5.2 -- -- 23.82 M W-10 10/15/2003 18.86 -- 491 -- 6.01 -- -- 26.01 MW -10 4/15/2004 16 -- 505 -- 6.2 -- -- 22.11 M W-10 10/6/2004 19 -- 444 -- 6 -- -- 89.69 MW -10 4/27/2005 15 -- 425 -- 6.2 -- -- 15.87 M W-10 10/19/2005 19.53 -- 412 -- 6.18 -- -- 15 MW -10 4/11/2006 14.55 -- 391.5 -- 6.14 -- -- 16.35 M W-10 10/25/2006 17.95 -- 395.6 -- 6.17 -- -- 19.68 MW -10 4/11/2007 12.98 -- 393.2 -- 6.07 -- -- 18.89 M W-10 10/22/2007 19.24 -- 393.5 -- 6.03 -- -- 19.21 MW -10 4/21/2008 14.38 -- 406.2 -- 6.09 -- -- 25 M W-10 10/13/2008 18.31 -- 425.5 -- 6.18 -- -- 40 MW -10 4/14/2009 13.57 -- 381.9 -- 6.21 -- -- 27 M W-10 10/21/2009 16.95 -- 431.7 -- 6.32 -- -- 30 MW -10 4/7/2010 13.6 -- 367.4 -- 6.1 -- -- 20 M W-10 10/6/2010 18.57 -- 374.2 -- 6.14 -- -- 16 M W-10 1/4/2011 12.18 -- 366 -- 6.12 210 <0.02 14 MW -10 5/5/2011 14.52 -- 367 -- 6.2 230 <0.023 14 MW -10D 4/21/2008 15.57 -- 390.7 -- 6.14 -- -- 28 MW -10D 10/13/2008 15.79 -- 390.1 -- 6.23 -- -- 33 MW -10D 4/14/2009 15.18 -- 386.4 -- 6.31 -- -- 29 MW -10D 10/21/2009 15.29 -- 390.7 -- 6.41 -- -- 29 MW -10D 4/7/2010 15.75 -- 393.9 -- 6.16 -- -- 27 MW -10D 10/6/2010 15.64 -- 393.5 -- 6.31 -- -- 31 MW -10D 1/4/2011 14.38 -- 397 -- 6.27 235 <0.02 32 MW -10D 5/5/2011 16 -- 390 -- 6.3 270 <0.023 30 MW -10D 9/7/2011 16.51 -- 385 -- 6.06 250 <0.023 32 M W-11 11/29/1993 17.8 -- 201 -- 5.1 -- -- -- M W-11 4/4/1994 14.6 -- 203 -- 4.9 -- -- -- M W-11 5/23/1994 17.8 -- 202 -- 5 -- -- -- M W-11 M W-11 M W-11 M W-11 M W-11 11/28/1994 5/8/1995 11/28/1995 4/18/1996 10/17/1996 17.8 15 18.6 16 18.6 -- 233 -- 226 -- 221 -- 223 -- 224 -- 4.7 -- 5.3 -- 5 -- 4.9 -- 5 Page 2 of 18 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Dan River 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 µi2/cm mg/L SU mg/L mg/L mg/L M W-11 4/17/1997 14.5 -- 216 -- 5.2 -- -- -- M W-11 10/15/1997 17.7 -- 213 -- 4.9 -- -- -- M W-11 4/21/1998 14.4 -- 229 -- 5 -- -- -- M W-11 10/27/1998 19.2 -- 221 -- 5 -- -- -- M W-11 4/6/1999 15.9 -- 2Z6.5 -- 5.1 -- -- -- M W-11 10/28/1999 18.7 -- 245.9 -- 4.7 -- -- -- MW-11 4/11/2000 21.89 -- 259 -- 4.8 -- -- 42.1 MW -11 10/11/2000 23 -- 252 -- 4.5 -- -- 36.1 M W-11 4/23/2001 17.7 -- 251 -- 4.6 -- -- -- M W-11 10/8/2001 17.75 -- 250 -- 4.56 -- -- 32.87 M W-11 4/22/2002 17 -- 248 -- 4.9 -- -- 30.03 M W-11 10/17/2002 19.26 -- 251 -- 4.9 -- -- 28.67 M W-11 4/22/2003 16 -- 276 -- 4.8 -- -- 27.03 MW -11 10/15/2003 20.45 -- 213.9 -- 4.87 -- -- 19.22 M W-11 4/15/2004 15 -- 203 -- 5 -- -- 13.41 MW -11 10/6/2004 20 -- 210 -- 4.9 -- -- 16.96 M W-11 4/27/2005 16 -- 223 -- 4.9 -- -- 15.39 MW -11 10/19/2005 20.59 -- 204 -- 4.8 -- -- 15.4 M W-11 4/11/2006 16.48 -- 206.8 -- 4.93 -- -- 19.34 M W-11 10/25/2006 18.26 -- 205.9 -- 4.9 -- -- 23.33 M W-11 4/11/2007 14.32 -- 204.5 -- 4.88 -- -- 21.79 MW -11 10/22/2007 21.07 -- 183.9 -- 4.74 -- -- 19.6 M W-11 4/21/2008 15.61 -- 209.8 -- 4.9 -- -- 29 MW -11 10/13/2008 21.97 -- 207 -- 4.87 -- -- 34 M W-11 4/14/2009 14.15 -- 219 -- 4.77 -- -- 32 M W-11 10/21/2009 16.46 -- 200 -- 5.01 -- -- 25 M W-11 4/7/2010 15.44 -- 184 -- 4.8 -- -- 15 M W-11 10/6/2010 18.35 -- 177 -- 4.9 -- -- 11 M W-11 1/4/2011 15.14 -- 189 -- 4.85 141 0.04 9.7 M W-11 5/5/2011 14.21 -- 182 -- 4.78 140 0.06 7.9 MW -11D 4/21/2008 17.67 -- 629.3 -- 11.2 -- -- 23 MW -11D 10/13/2008 18.68 -- 356 -- 10.03 -- -- 31 MW -11D 4/14/2009 15.17 -- 375 -- 9.05 -- -- 27 MW -11D 10/21/2009 15.94 -- 409 -- 8.56 -- -- 29 MW -11D 4/7/2010 17.53 -- 432 -- 8.68 -- -- 26 MW -11D 10/6/2010 15.92 -- 452 -- 8.43 -- -- 30 MW -11D 1/4/2011 15.58 -- 464 -- 8.22 289 <0.02 30 MW -11D 5/5/2011 15.89 -- 452 -- 8.32 300 <0.023 29 M W-12 11/28/1995 15.5 -- 82 -- 5.6 -- -- -- MW-12 4/18/1996 15.4 -- 67 -- 5.2 -- -- -- M W-12 10/17/1996 14.8 -- 59 -- 5.6 -- -- -- MW-12 4/17/1997 14.1 -- 52 -- 5.3 -- -- -- M W-12 10/15/1997 14.6 -- 74.8 -- 5.3 -- -- -- MW-12 4/21/1998 15 -- 46 -- 5.3 -- -- -- M W-12 MW-12 M W-12 MW-12 M W-12 MW -12 M W-12 10/27/1998 4/6/1999 10/28/1999 4/10/2000 10/11/2000 4/23/2001 10/8/2001 14.6 -- 14.4 -- 14.7 -- 14.81 -- 15 -- 15.6 -- 16.2 -- 63.7 -- 64.1 -- 63.4 -- 52 -- 64 -- 72 -- 73 -- 5.7 5.3 5.2 5 5 5.1 5.12 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 5.8 5.76 -- 5.36 Dan River 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 µi2/cm mg/L SU mg/L mg/L mg/L -- 4.84 M W-12 10/15/2003 MW -12 4/22/2002 16 -- 72 -- 5.8 -- -- 4.56 M W-12 10/17/2002 15.53 -- 77 -- 5.5 -- -- 5.15 MW -12 4/22/2003 15 -- 76.5 -- 6 -- -- 4.84 M W-12 10/15/2003 14.89 -- 53 -- 5.31 -- -- 5.45 MW -12 4/15/2004 18 -- 53 -- 5.4 -- -- 7.77 M W-12 10/6/2004 15 -- 69 -- 5.4 -- -- 58.8 MW -12 4/27/2005 15 -- 75 -- 5.6 -- -- 4.78 M W-12 10/19/2005 15.61 -- 80 -- 5.49 -- -- 4.52 MW -12 4/11/2006 15.62 -- 77.3 -- 5.53 -- -- 4.81 M W-12 10/25/2006 14.35 -- 76.7 -- 5.59 -- -- 4.23 MW -12 4/11/2007 14.2 -- 77.5 -- 5.35 -- -- 4.57 M W-12 10/22/2007 16.22 -- 84.4 -- 5.3 -- -- 4.99 MW -12 4/21/2008 15.48 -- 102.8 -- 5.67 -- -- 5.9 M W-12 10/13/2008 14.89 -- 101 -- 5.59 -- -- 6.3 MW -12 4/14/2009 14.97 -- 77 -- 5.59 -- -- 4.9 M W-12 10/21/2009 14.88 -- 85 -- 5.83 -- -- 6 MW -12 4/7/2010 15.04 -- 75 -- 5.38 -- -- 6 M W-12 10/6/2010 14.71 -- 89 -- 5.66 -- -- 6.4 MW -12D 4/21/2008 15.39 -- 213.7 -- 6.22 -- -- 8.6 MW -12D 10/13/2008 15.02 -- 206 -- 6.15 -- -- 11 MW -12D 4/14/2009 15.06 -- 217 -- 6.21 -- -- 9.7 MW -12D 10/21/2009 14.96 -- 209 -- 6.42 -- -- 10 MW -12D 4/7/2010 15.09 -- 214 -- 5.99 -- -- 8.5 MW -12D 10/6/2010 14.79 -- 211 -- 6.22 -- -- 10 MW -20S 1/4/2011 13.65 -- 239.9 -- 5.98 140 <0.02 21 MW -20S 5/5/2011 12.64 -- 234.1 -- 6 150 <0.023 21 M W -20S 9/7/2011 15.4 -- 228.9 -- 5.97 140 <0.023 21 MW -20S 1/12/2012 14.15 215 223.7 0.08 6.24 160 <0.023 21 MW -20S 5/7/2012 13.81 218 224 0.51 5.91 147 <0.023 20 MW -20S 9/4/2012 15.71 159 230 0.47 5.87 150 <0.023 19 M W -20S 1/7/2013 14.12 312 219 0.44 5.98 130 <0.023 21 MW -20S 5/7/2013 12.99 288 220 0.08 5.82 150 <0.023 21 MW -20S 9/4/2013 15.16 256 223 -- 5.94 140 <0.023 20 MW -20S 1/13/2014 14.17 266 223 0.45 5.87 150 <0.023 20 M W -20S 5/5/2014 12.94 227 223 0.44 5.89 150 <0.023 19 MW -20S 9/8/2014 14.72 188 221 0.04 5.87 140 <0.023 18 M W -20S 1/5/2015 14.06 257 212 0.53 6.13 130 <0.023 19 MW -20S 5/4/2015 12.59 239 211 0.36 5.94 130 <0.023 19 M W -20S 9/1/2015 15.14 233 213 0.1 5.96 140 <0.023 18 MW -20S 1/4/2016 14.27 226 222 0 6.02 120 <0.023 19 MW -20S 5/2/2016 13.31 238 214 0 5.83 140 <0.023 20 MW -20D 1/4/2011 13.52 -- 325.6 -- 7.27 172 <0.02 5.3 MW -20D 5/5/2011 13.76 -- 327.7 -- 7.44 210 <0.023 4.7 MW -20D 9/7/2011 14.58 -- 323.4 -- 7.41 200 <0.023 4.9 MW -20D 1/12/2012 13.96 182 323.7 0.07 7.67 210 <0.023 4.9 MW -20D 5/7/2012 14.22 153 319 0 7.35 283 <0.023 4.6 MW -20D 9/4/2012 14.52 105 325 0 7.32 210 <0.023 4.1 MW -20D 1/7/2013 14.22 276 323 0.18 7.37 190 <0.023 4.5 MW -20D 5/7/2013 14.12 216 324 0.05 7.31 200 <0.023 4.7 MW-ZOD MW -20D 9/4/2013 1/13/2014 14.38 14.11 188 204 324 325 -- 0.18 7.42 7.32 200 210 <0.023 <0.023 4.3 4.5 Dan River 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 µi2/cm mg/L SU mg/L mg/L mg/L 7.45 200 <0.023 4.4 MW -20D 9/1/2015 14.41 144 MW -20D 5/5/2014 14.25 186 325 0.19 7.29 200 <0.023 4.6 MW -20D 9/8/2014 14.26 159 323 0.08 7.31 200 <0.023 4.2 MW -20D 1/5/2015 14.02 195 324 0.15 7.58 200 <0.023 4.3 MW -20D 5/4/2015 14.03 170 325 0.13 7.45 200 <0.023 4.4 MW -20D 9/1/2015 14.41 144 326 0.12 7.43 200 <0.023 4.4 MW -20D 1/4/2016 13.79 171 325 0 7.44 170 <0.023 4.9 MW -20D 5/2/2016 14.23 194 317 0 7.23 190 <0.023 4.7 MW -21S 1/4/2011 16.51 -- 217.7 -- 6.82 127 <0.02 11 MW -21S 5/5/2011 15.88 -- 225.3 -- 6.81 150 0.03 11 M W -21S 9/7/2011 18.41 -- 217.9 -- 6.59 130 <0.023 12 MW -21S 1/12/2012 17.36 354 227.2 0.27 7.05 160 0.06 13 MW -21S 5/7/2012 16.67 302 241 0.3 6.7 297 <0.023 10 MW -21S 9/4/2012 19.07 270 267 0.42 6.61 170 <0.023 10 MW -21S 1/7/2013 17.82 334 294 0.13 6.74 180 <0.023 15 MW -21S 5/7/2013 16.18 261 290 0.65 6.81 210 0.02 22 MW -21S 9/3/2013 17.52 325 329 -- 6.65 200 <0.023 20 MW -21S 1/13/2014 16.47 278 276 0.55 6.74 180 0.07 13 MW -21S 5/5/2014 15.57 309 284 0.32 6.47 180 <0.023 12 MW -21S 9/8/2014 17.17 300 265 0.11 6.45 160 <0.023 12 MW -21S 1/5/2015 16.61 300 207 0.33 6.94 140 <0.023 10 MW -21S 5/4/2015 15.88 287 225 0.34 6.62 150 <0.023 9.4 MW -21S 9/1/2015 17.76 231 256 0.12 6.74 150 <0.023 11 _ MW -21S 9/10/2015 19.2 140 250 0.5 6.69 -- -- -- _ MW-21S 1/4/2016 17.9 258 234 0 6.7 130 <0.023 9 MW -21S 5/2/2016 16.63 240 217 0 6.79 140 <0.023 7.4 MW -21D 1/4/2011 17.14 -- 885.4 -- 7.22 643 <0.02 17 MW -21D 5/5/2011 16.74 -- 948.6 -- 7.21 770 <0.023 15 MW -21D 9/7/2011 16.81 -- 878.4 -- 7.08 670 <0.023 16 MW -21D 1/12/2012 17.68 222 900.9 0.45 7.36 710 <0.023 18 MW -21D 5/7/2012 17.32 204 950 0.44 7.07 743 <0.023 16 MW -21D 9/4/2012 17.49 190 938 0.42 7 730 <0.023 16 MW -21D 1/7/2013 18 247 922 1.69 7.24 700 <0.023 18 MW -21D 5/7/2013 17.21 211 907 0.26 7.13 760 0.03 17 MW -21D 9/3/2013 16.83 216 893 -- 7.03 710 <0.023 16 MW -21D 1/13/2014 17.29 234 922 0.5 7.01 700 <0.023 17 MW -21D 5/5/2014 17 206 965 0 6.94 740 <0.023 17 MW -21D 9/8/2014 16.25 182 860 0.17 7 670 0.03 16 MW -21D 1/5/2015 17.02 215 835 1.92 7.28 630 <0.023 18 MW -21D 5/4/2015 16.52 179 889 0.2 7.12 650 0.03 17 MW -21D 9/1/2015 16.64 155 840 0.2 7.14 600 0.04 17 MW -21D 1/4/2016 17.47 195 858 0 7.14 600 <0.023 18 MW -21D 5/2/2016 17.29 187 874 0 6.87 640 <0.023 19 MW -22S 1/12/2012 15.38 145 402 0.46 6.78 220 <0.023 24 MW -22S 5/7/2012 16.57 28 418 0.1 6.8 164 <0.023 22 MW -22S 9/4/2012 18.45 32 395 0.17 6.66 210 <0.023 19 MW -22S 1/7/2013 14.11 109 399 0.84 6.81 200 0.04 21 MW -22S 5/7/2013 16.28 100 331 0.43 6.67 200 <0.023 17 MW -22S 9/3/2013 18.46 62 391 -- 6.56 210 <0.023 18 MW -22S 1/13/2014 16.36 142 345 0.41 6.57 210 <0.023 18 MW -22S MW -22S 5/5/2014 9/8/2014 15.82 16.97 67 60 390 380 0.61 0.3 6.62 6.55 200 210 <0.023 <0.023 20 20 Dan River Steam Station Page 5 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells MW -22S NCAC 2L Standard: Units: 1/5/2015 NS °C 15.86 NS NS NS mV µi2/cm mg/L 122 397 0.41 6.5 - 8.5 SU 6.55 500 mg/L 210 10 mg/L <0.023 250 mg/L 19 MW -22S 5/4/2015 15.44 121 413 0.46 6.72 210 <0.023 18 MW -22S 9/1/2015 17.88 104 425 0.5 6.62 220 <0.023 18 MW -22S 1/4/2016 16.14 135 416 0.18 6.88 210 <0.023 18 MW -22S 5/2/2016 16.18 6 368 0 6.6 220 <0.023 21 MW -22D 1/12/2012 12.04 164 436 6.23 7.48 320 0.04 23 MW -22D 5/7/2012 16.92 185 454 5.25 7.46 210 0.28 21 MW -22D 9/5/2012 19.54 188 476 6.26 7.69 340 0.04 19 MW -22D 1/7/2013 13.68 190 414 7.47 7.73 280 0.08 19 MW -22D 5/8/2013 16.92 139 423 4.16 7.62 -- -- -- MW-22D 9/4/2013 18.92 167 427 -- 7.58 310 0.07 16 MW -22D 1/13/2014 13.53 211 405 6.71 7.5 290 0.04 17 MW -22D 5/5/2014 16.27 145 398 6.98 7.56 270 0.03 17 MW -22D 9/8/2014 17.27 140 406 6.96 7.53 290 0.03 17 MW -22D 1/5/2015 14.12 200 448 7.25 7.58 130 0.5 19 MW -22D 5/4/2015 15.99 179 459 7.19 7.78 290 0.52 19 MW -22D 9/1/2015 18.28 126 459 8.08 7.52 290 -- -- MW-22D 1/4/2016 14.78 156 473 7.51 7.67 290 0.58 20 MW -22D 5/2/2016 16.88 151 443 7.33 7.61 310 0.5 21 MW -23D 1/4/2011 12.46 -- 354.6 -- 6.9 204 0.56 13 MW -23D 5/5/2011 12.17 -- 186.2 -- 5.92 140 0.22 8.2 MW -23D 9/7/2011 18.63 -- 139 -- 6.14 99 0.03 2.4 MW -23D 1/12/2012 11.41 389 115 7.8 6.16 120 0.03 3.3 MW -23D 5/7/2012 15.73 278 463 6.82 6.7 202 0.03 5.4 MW -23D 9/4/2012 20.6 265 434 7.27 6.75 250 0.04 5 MW -23D 1/7/2013 11.22 324 284 3.57 6.34 190 0.07 7.4 MW -23D 5/8/2013 12.38 348 365 3.82 6.65 200 0.04 6.5 MW -23D 9/4/2013 17.27 156 496 -- 6.78 280 <0.023 4.8 MW -23D 1/13/2014 11.55 391 128 7.42 5.91 100 <0.023 3.2 MW -23D 5/5/2014 14.05 249 430 6.69 6.75 280 0.05 4.7 MW -23D 9/8/2014 17.29 289 157 5.59 5.76 120 0.06 1.3 MW -23D 1/5/2015 12.81 353 192 6.36 6.05 300 <0.023 3.8 MW -23D 5/4/2015 12.99 230 425 8.86 6.84 180 0.03 4.4 MW -23D MW -23D MW -23D 9/1/2015 1/4/2016 5/2/2016 16.49 13.32 12.86 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 195 478 0.63 7.01 290 0.12 283 228 4.33 6.49 150 <0.023 267 102 6.56 5.67 81 <0.023 Notes: °C indicates temperature measured in degrees celsius mV indicates oxidation/reduction potential measured in millivolts µi2/cm indicates specific conductivity measured in micromhos per centimeter mg/L indicates concentrations measured in milligrams per liter µg/L indicates concentrations measured in micrograms per liter SU indicates pH values measured in standard units NTU indicates turbidity values measured in Nephalometric Turbidity Units 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 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 Page 6 of 18 5.8 4.8 2.8 Dan River Steam Station 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 15 Units: mg/L µg/L µg/L µg/L µg/L µg/L mg/L µg/L µg/L <1 0.001 239 <2 M W-9 M W-9 MW -9 MW -9 MW -9 M W-9 MW -9 M W-9 MW -9 MW -9 5/8/1995 11/28/1995 4/18/1996 10/17/1996 4/17/1997 10/15/1997 4/21/1998 10/27/1998 4/6/1999 10/28/1999 15 15 20 32 16 16 18 13 13 20 <1 1.4 <1 <1 <1 <2 <2 <2 <2 <2 95 105 100 120 100 105 126 109 112 109 MW -9 11/29/1993 53 5 128 -- 0.11 0 0 761 2.5 MW -9 4/4/1994 20 <1 60 -- <0.1 <1 0.001 103 <2 MW -9 5/23/1994 18 <1 83 -- <0.1 <1 0 184 <2 M W-9 11/28/1994 16 <1 101 -- 0.31 <1 0.001 239 <2 M W-9 M W-9 MW -9 MW -9 MW -9 M W-9 MW -9 M W-9 MW -9 MW -9 5/8/1995 11/28/1995 4/18/1996 10/17/1996 4/17/1997 10/15/1997 4/21/1998 10/27/1998 4/6/1999 10/28/1999 15 15 20 32 16 16 18 13 13 20 <1 1.4 <1 <1 <1 <2 <2 <2 <2 <2 95 105 100 120 100 105 126 109 112 109 -- -- -- -- -- -- -- -- -- -- <0.1 <0.1 <0.1 0.19 <0.1 <0.5 <0.5 <0.5 <0.5 <0.5 <1 <1 <1 1.3 <1 <1 1.5 <1 <1 <1 0.001 0.001 <0.0005 0.003 <0.0005 <0.001 0.002 <0.001 <0.002 <0.002 520 1184 1410 2200 2012 2729 7724 2258 754 2252 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 MW -9 4/10/2000 15.4 <2 150 -- <0.5 2.91 0.006 10000 2.15 M W-9 MW -9 M W-9 10/11/2000 4/23/2001 10/8/2001 15.16 15 14.35 <2 <2 <2 140 100 99 -- -- -- <0.5 <0.5 <0.5 1.95 <1 7.84 0.006 0.004 <0.002 6300 3486 590 <2 <2 <2 MW -9 4/22/2002 11.65 <2 110 -- <0.5 1.6 0.003 440 <2 M W-9 10/17/2002 12.9 <2 109 -- <0.5 1.24 0.003 439 <2 MW -9 4/22/2003 13.4 <2 113 -- <0.5 <1 <0.002 694 <2 M W-9 10/15/2003 13.5 <2 103 -- <0.5 1.84 0.004 907 <2 M W-9 4/15/2004 12.7 <2 94 -- <0.5 2.18 <0.002 1674 <2 M W-9 10/6/2004 12.8 <2 105 -- <0.5 <1 <0.002 1842 <2 MW -9 4/27/2005 11.48 <2 99 -- <0.5 <1 <0.002 1956 Q M W-9 10/19/2005 11.7 <2 104 -- <0.5 <1 <0.002 2058 <2 MW -9 4/11/2006 10.35 <2 95 192 <0.5 1.64 <0.002 296 Q M W-9 10/25/2006 10.3 <2 105 220 <0.5 1.29 <0.002 975 <2 MW -9 4/11/2007 9.61 <2 96 236 <0.5 2.26 <0.002 2098 <2 M W-9 10/22/2007 12.57 <2 101 197 <0.5 <1 <0.002 118 <2 MW -9 4/21/2008 12 <2 104 155 <0.5 <1 <0.002 491 <2 M W-9 10/13/2008 13 <2 100 198 <0.5 <1 <0.002 907 <2 MW -9 4/14/2009 13 <2 94 164 <0.5 <1 <0.002 2050 <2 M W-9 10/21/2009 12 <1 83.5 221 <1 <1 <0.001 320 <1 MW -9 4/7/2010 15 <1 87 159 <1 <1 <0.001 543 <1 M W-9 10/6/2010 15 <1 88 157 <1 <1 0.003 1550 <1 MW -9 1/4/2011 9.6 <1 $5 232 <1 <5 <0.005 2830 <1 MW -9 5/5/2011 9.6 <1 76 194 <1 <5 <0.005 978 <1 MW -9D 4/21/2008 84 <2 11 904 <0.5 1.54 0.003 723 <2 MW -9D 10/13/2008 82 <2 8 944 <0.5 <1 <0.002 237 <2 MW -9D 4/14/2009 95 <2 8 917 <0.5 <1 <0.002 161 <2 MW -9D 10/21/2009 91 <1 11.5 911 <1 2.24 0.002 1360 <1 MW -9D 4/7/2010 95 <1 12 960 <1 1.3 0.002 1090 <1 MW -9D 10/6/2010 91 <1 7 950 <1 <1 <0.001 268 <1 MW -9D 1/4/2011 92 <1 7 1070 <1 <5 <0.005 134 <1 MW -9D 5/5/2011 90 <1 7 1080 <1 <5 <0.005 258 <1 MW -9D 9/7/2011 90 <1 8 1060 <1 <5 <0.005 346 <1 MW -10 11/29/1993 34 5 83 -- 0.15 <1 0 437 <2 MW -10 4/4/1994 56 <1 107 -- <0.1 0 0 508 <2 MW -10 5/23/1994 31 <1 104 -- <0.1 <1 0 92 <2 MW -10 11/28/1994 47 <1 128 -- <0.1 <1 0.001 153 <2 Page 7 of 18 Dan River Steam Station CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells MW -10 NCAC 2L Standard: Units: 5/8/1995 250 mg/L 43 10 µg/L <1 700 µg/L 110 700 µg/L -- 2 µg/L <0.1 10 µg/L <1 1 mg/L 0.002 300 µg/L 200 15 µg/L <2 MW -10 11/28/1995 41 1.8 108 -- <0.1 2 0.001 293 <2 MW -10 4/18/1996 39 <1 110 -- <0.1 1.2 <0.0005 160 <2 MW -10 10/17/1996 47 <1 110 -- <0.1 1.4 0.001 320 2.1 MW -10 4/17/1997 37 <1 97 -- 0.2 1.3 <0.0005 54 <2 MW -10 10/15/1997 29 <2 96 -- <0.5 1.2 0.001 115 <2 MW -10 4/21/1998 39 <2 100 -- <0.5 1.1 <0.001 94 4.4 MW -10 10/27/1998 30 <2 131 -- <0.5 <1 <0.001 111 <2 MW -10 4/6/1999 51 <2 141 -- <0.5 <1 <0.002 95 <2 MW -10 10/28/1999 60 <2 117 -- <0.5 <1 <0.002 42 <2 MW -10 4/10/2000 32.8 <2 120 -- <0.5 2.07 0.004 450 <2 MW -10 10/11/2000 38.52 <2 120 -- <0.5 2.15 0.009 1700 <2 MW -10 4/23/2001 34 <2 105 -- <0.5 <1 0.004 364 <2 M W-10 10/8/2001 33.62 <2 116 -- <0.5 7.2 0.003 517 <2 MW -10 4/22/2002 35.39 <2 110 -- <0.5 <1 0.004 60 <2 MW -10 10/17/2002 32.38 <2 108 -- <0.5 1.52 0.005 1143 <2 MW -10 4/22/2003 42.6 <2 114 -- <0.5 <1 0.003 56 Q MW -10 10/15/2003 97.28 <2 132 -- <0.5 1.09 0.005 16 <2 MW -10 4/15/2004 123 <2 121 -- <0.5 1.46 <0.002 35 <2 M W-10 10/6/2004 16.88 <2 117 -- <0.5 1.15 <0.002 26 <2 MW -10 4/27/2005 60.94 <2 107 -- <0.5 <1 <0.002 57 <2 MW -10 10/19/2005 52 <2 110 -- <0.5 <1 <0.002 20 <2 MW -10 4/11/2006 43.67 <2 99 400 <0.5 1.26 -- 36 <2 MW -10 10/25/2006 36.14 <2 111 422 <0.5 <1 <0.002 <10 <2 MW -10 4/11/2007 38.05 <2 111 391 <0.5 1.42 <0.002 37 <2 MW -10 10/22/2007 42.35 <2 74 401 <0.5 <1 <0.002 10 <2 MW -10 4/21/2008 41 <2 112 348 <0.5 1.1 <0.002 47 <2 MW -10 10/13/2008 44 <2 123 425 <0.5 <1 <0.002 <10 <2 MW -10 4/14/2009 43 <2 110 301 <0.5 <1 <0.002 37 <2 MW -10 10/21/2009 42 <1 79 407 <1 <1 <0.001 <10 <1 MW -10 4/7/2010 40 <1 101 320 <1 <1 <0.001 344 <1 MW -10 10/6/2010 56 <1 111 373 <1 <1 <0.001 16 <1 MW -10 1/4/2011 49 <1 109 364 <1 <5 <0.005 123 <1 MW -10 5/5/2011 40 <1 99 336 <1 <5 <0.005 269 <1 MW -10D 4/21/2008 48 <2 62 474 <0.5 1.09 <0.002 850 <2 MW -10D 10/13/2008 45 <2 56 473 <0.5 <1 <0.002 624 <2 MW -10D 4/14/2009 48 <2 58 467 <0.5 <1 <0.002 414 <2 MW -10D 10/21/2009 44 <1 51.9 484 <1 <1 0.001 314 <1 MW -10D 4/7/2010 45 <1 59 483 <1 <1 <0.001 267 <1 MW -10D 10/6/2010 46 <1 54 439 <1 <1 <0.001 230 <1 MW -10D 1/4/2011 46 <1 58 507 <1 <5 <0.005 241 <1 MW -10D 5/5/2011 43 <1 57 482 <1 <5 <0.005 246 <1 MW -10D 9/7/2011 46 <1 56 467 <1 <5 <0.005 207 <1 MW -11 MW -11 MW -11 MW -11 11/29/1993 4/4/1994 5/23/1994 11/28/1994 30 40 23 36 5 <1 6.7 <1 91 131 161 169 -- -- -- -- <0.1 0.14 <0.1 <0.1 <1 2.2 3 2.6 0.001 0.001 0.001 0.001 547 2100 2474 2886 <2 6.2 6.6 8.5 MW -11 MW -11 M W-11 MW -11 5/8/1995 11/28/1995 4/18/1996 10/17/1996 41 35 196 53 1.3 1.1 <1 <1 190 157 160 180 -- -- -- -- <0.1 <0.1 <0.1 <0.1 Page 8 of 18 2.7 2.4 3.2 3.2 0.008 0.004 0.004 0.008 2900 3126 4010 4300 10.1 5.2 8.1 9.7 Dan River Steam Station 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 15 Units: mg/L µg/L µg/L µg/L µg/L µg/L mg/L µg/L µg/L 1.1 0.004 2807 4.6 MW -11 MW -11 MW -11 MW -11 M W-11 M W-11 MW -11 MW -11 MW -11 MW -11 4/6/1999 10/28/1999 4/11/2000 10/11/2000 4/23/2001 10/8/2001 4/22/2002 10/17/2002 4/22/2003 10/15/2003 67 61 36.3 52.4 67 56.99 53.08 46.49 53.94 55.83 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 142 146 130 130 207 122 130 147 140 114 MW -11 4/17/1997 77 <1 104 -- <0.1 <1 0.002 986 2.5 M W-11 10/15/1997 128 <2 127 -- <0.5 1.6 0.006 1657 7.1 MW -11 4/21/1998 57 <2 84 -- <0.5 1.2 0.001 590 <2 MW -11 10/27/1998 38 <2 121 -- <0.5 1.1 0.004 2807 4.6 MW -11 MW -11 MW -11 MW -11 M W-11 M W-11 MW -11 MW -11 MW -11 MW -11 4/6/1999 10/28/1999 4/11/2000 10/11/2000 4/23/2001 10/8/2001 4/22/2002 10/17/2002 4/22/2003 10/15/2003 67 61 36.3 52.4 67 56.99 53.08 46.49 53.94 55.83 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 142 146 130 130 207 122 130 147 140 114 -- -- -- -- -- -- -- -- -- -- <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 2 2 4.25 <1 3.95 2.65 <1 1.84 2.38 <1 0.004 0.004 0.005 0.005 0.01 0.003 0.004 0.007 0.002 0.005 10470 5010 2100 1800 15070 500 550 2769 569 444 4.6 4.6 <2 <2 7.76 <2 <2 3.07 <2 <2 MW -11 4/15/2004 71.86 <2 98 -- <0.5 <1 <0.002 357 <2 MW -11 10/6/2004 58.39 <2 103 -- <0.5 <1 <0.002 589 <2 MW -11 4/27/2005 56.48 <2 106 -- <0.5 <1 <0.002 258 <2 MW -11 10/19/2005 51.2 <2 94 -- <0.5 <1 <0.002 284 <2 MW -11 4/11/2006 50.32 <2 102 140 <0.5 <1 <0.002 131 <2 MW -11 10/25/2006 34.97 <2 97 168 <0.5 <1 <0.002 40 <2 MW -11 4/11/2007 38.73 <2 95 171 <0.5 <1 <0.002 37 <2 MW -11 10/22/2007 40.94 <2 95 147 <0.5 <1 <0.002 71 <2 MW -11 4/21/2008 35 <2 98 108 <0.5 <1 <0.002 150 <2 _ MW -11 10/13/2008 32 <2 103 154 <0.5 <1 <0.002 138 <2 MW -11 4/14/2009 39 <2 105 115 <0.5 <1 <0.002 80 <2 MW -11 10/21/2009 40 <1 90.7 163 <1 <1 <0.001 170 <1 MW -11 4/7/2010 49 <1 85 140 <1 <1 <0.001 144 <1 MW -11 10/6/2010 52 <1 72 223 <1 <1 <0.001 58 <1 MW -11 1/4/2011 57 <1 94 289 <1 <5 <0.005 1040 <1 MW -11 5/5/2011 57 <1 75 206 <1 <5 <0.005 200 <1 MW -11D 4/21/2008 82 2.44 463 <100 <0.5 61.1 0.149 47100 33.2 MW -11D 10/13/2008 82 <2 192 <100 <0.5 19.3 0.056 17500 12.8 MW -11D 4/14/2009 79 <2 126 <100 <0.5 11.9 0.038 9280 7.3 MW -11D 10/21/2009 77 <1 38 88.2 <1 1.67 0.005 1060 1.06 MW -11D 4/7/2010 79 <1 63 97 <1 3.8 0.011 2340 2 MW -11D 10/6/2010 77 <1 45 65 <1 1.08 0.003 477 <1 MW -11D 1/4/2011 77 <1 46 112 <1 <5 <0.005 975 1.07 MW -11D 5/5/2011 74 <1 56 105 <1 <5 <0.005 783 <1 M W-12 11/28/1995 10 2 50 -- 0.2 4.7 0.011 12612 7.4 MW -12 4/18/1996 9 <1 26 -- 0.2 2.8 0.011 8320 4.6 MW -12 10/17/1996 25 <1 14 -- <0.1 1.4 0.003 2900 3.2 MW -12 4/17/1997 15 1.2 26 -- <0.1 1.8 0.014 2607 4.2 M W-12 10/15/1997 124 <2 18 -- <0.5 <1 0.006 2635 3.6 MW -12 4/21/1998 7 2.3 173 -- <0.5 7.6 0.113 69734 MW -12 10/27/1998 8 <2 11 -- <0.5 <1 0.008 1857 MW -12 4/6/1999 8 <2 15 -- <0.5 2.2 0.005 4683 M W-12 10/28/1999 15 3.4 64 -- <0.5 9.9 0.043 36258 MW -12 4/10/2000 5.6 <2 19 -- <0.5 1.44 0.056 5800 MW -12 10/11/2000 8.88 <2 23 -- <0.5 1.96 0.024 12000 MW -12 4/23/2001 8 <2 29 -- <0.5 2.94 0.012 15313 M W-12 10/8/2001 10.4 <2 11 -- <0.5 3.88 0.015 3765 Page 9 of 18 39.1 <2 <2 13.8 15.22 8.16 3.55 3.04 Dan River Steam Station CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells MW -12 NCAC 2L Standard: Units: 4/22/2002 250 mg/L 7.96 10 µg/L <2 700 µg/L 27 700 µg/L -- 2 µg/L <0.5 10 µg/L 3.8 1 mg/L 0.019 300 µg/L 9200 15 µg/L 4.1 MW -12 10/17/2002 8.49 2.35 40 -- <0.5 6.13 0.041 19891 8.07 MW -12 4/22/2003 8.16 <2 33 -- <0.5 3.72 0.007 3379 <2 MW -12 10/15/2003 7.9 <2 15 -- <0.5 1.88 0.006 4066 <2 MW -12 M W-12 MW -12 MW -12 MW -12 4/15/2004 10/6/2004 4/27/2005 10/19/2005 4/11/2006 11.1 100.1 8.13 9.06 8.9 3.04 <2 <2 <2 <2 64 28 28 15 17 -- -- -- -- <100 <0.5 <0.5 <0.5 <0.5 <0.5 10.71 4.28 4.52 1.23 3.04 0.043 0.016 0.019 0.01 0.025 37051 11487 13050 3948 5701 10.85 3.41 4.92 <2 2.84 MW -12 10/25/2006 7.86 3.51 38 <100 <0.5 11.03 0.044 18879 8.98 MW -12 M W-12 MW -12 4/11/2007 10/22/2007 4/21/2008 9.06 10.55 11 <2 <2 <2 11 10 14 <100 <100 <100 <0.5 <0.5 <0.5 <1 <1 1.5 0.021 0.01 0.025 1683 2657 3780 <2 <2 2.03 M W-12 10/13/2008 14 <2 13 <100 <0.5 1.22 0.031 5150 4.44 MW -12 4/14/2009 9.3 <2 10 <100 <0.5 <1 0.043 1740 <2 M W-12 10/21/2009 11 <1 7.68 <50 <1 <1 0.043 3800 6.07 MW -12 4/7/2010 9.7 <1 10 <50 <1 <1 0.052 1700 1 M W-12 10/6/2010 12 <1 8 <50 <1 <1 0.012 3490 1.25 MW -12D 4/21/2008 26 <2 17 <100 <0.5 <1 <0.002 5820 <2 MW -12D 10/13/2008 27 <2 17 <100 <0.5 <1 <0.002 5750 <2 MW -12D 4/14/2009 30 <2 18 <100 <0.5 <1 <0.002 5770 <2 MW -12D 10/21/2009 27 <1 16.5 <50 <1 <1 <0.001 6270 <1 MW -12D 4/7/2010 28 <1 200 <50 <1 <1 <0.001 5950 <1 MW -12D 10/6/2010 28 <1 18 <50 <1 <1 <0.001 5820 <1 M W -20S 1/4/2011 9.4 <1 19 <50 <1 <5 <0.005 2890 <1 MW -20S 5/5/2011 6.1 <1 16 <50 <1 <5 <0.005 3190 <1 MW -20S 9/7/2011 5.9 1.03 16 <50 <1 <5 <0.005 3070 <1 MW -20S 1/12/2012 5.8 1.28 16 <50 <1 <5 <0.005 3100 <1 M W -20S 5/7/2012 5.4 <1 15 <50 <1 <5 <0.005 2960 <1 MW -20S 9/4/2012 5.4 <1 16 <50 <1 <5 <0.005 3090 r1 MW -20S 1/7/2013 5.2 <1 15 <50 <1 <5 <0.005 2350 <1 MW -20S 5/7/2013 5.2 <1 15 <50 <1 <5 <0.005 2570 <1 MW -20S 9/4/2013 4.9 <1 16 <50 <1 <5 <0.005 2850 <1 MW -20S 1/13/2014 5.6 <1 16 <50 <1 <5 <0.005 2580 <1 M W -20S 5/5/2014 5.6 <1 15 <50 <1 <5 <0.005 2460 <1 MW -20S 9/8/2014 5.3 <1 16 <50 <1 <5 <0.005 2720 <1 M W -20S 1/5/2015 4.8 <1 15 <50 <1 <5 <0.005 2440 <1 MW -20S 5/4/2015 5 <1 18 <50 <1 <5 <0.005 2480 <1 MW -20S 9/1/2015 4.7 <1 14 <50 <1 <5 <0.005 2530 <1 MW -20S 1/4/2016 5.9 <1 16 <50 <1 <5 <0.005 2620 <1 MW -20S 5/2/2016 5.8 <1 16 72 <1 <5 <0.005 2400 <1 MW -20D 1/4/2011 6.5 <1 62 <50 <1 <5 <0.005 97 <1 MW -20D 5/5/2011 6.1 <1 64 <50 <1 <5 <0.005 78 <1 MW -20D 9/7/2011 6.4 <1 63 <50 <1 <5 <0.005 55 <1 MW -20D 1/12/2012 6.4 <1 66 <50 1.53 <5 <0.005 59 12.5 MW -20D 5/7/2012 6.4 <1 64 <50 <1 <5 <0.005 41 <1 MW -20D 9/4/2012 6.3 <1 66 <50 <1 <5 <0.005 23 <1 MW -20D 1/7/2013 6.3 <1 65 <50 <1 <5 <0.005 44 <1 MW -20D 5/7/2013 6.4 <1 64 <50 <1 <5 <0.005 61 <1 MW -20D 9/4/2013 6.1 <1 66 <50 <1 <5 <0.005 40 <1 MW -20D 1/13/2014 6.4 <1 66 <50 <1 <5 <0.005 63 <1 Dan River 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 15 Units: mg/L µg/L µg/L µg/L µg/L µg/L mg/L µg/L µg/L 32 <1 MW -20D 9/1/2015 6 <1 64 <50 <1 <5 MW -20D 5/5/2014 6.4 <1 64 <50 <1 <5 <0.005 34 <1 MW -20D 9/8/2014 6.2 <1 65 <50 <1 <5 <0.005 43 <1 MW -20D 1/5/2015 6.2 1.05 65 <50 <1 <5 <0.005 40 <1 MW -20D 5/4/2015 6.3 <1 68 <50 <1 <5 <0.005 32 <1 MW -20D 9/1/2015 6 <1 64 <50 <1 <5 <0.005 59 <1 MW -20D 1/4/2016 6.8 <1 69 <50 <1 <5 <0.005 126 <1 MW -20D 5/2/2016 7 <1 65 94 <1 <5 <0.005 46 <1 M W -21S 1/4/2011 29 32.3 30 417 <1 <5 <0.005 68 <1 MW -21S 5/5/2011 46 28.6 32 290 <1 <5 <0.005 18 <1 M W -21S 9/7/2011 30 33.8 33 449 <1 <5 <0.005 14 <1 MW -21S 1/12/2012 35 29.5 36 423 <1 <5 <0.005 89 <1 MW -21S 5/7/2012 54 30.2 43 343 <1 <5 <0.005 34 <1 MW -21S 9/4/2012 38 44.7 46 484 <1 <5 <0.005 <10 <1 M W -21S 1/7/2013 54 25.2 46 389 <1 <5 <0.005 17 <1 M W -21S 5/7/2013 62 21.1 50 261 <1 <5 <0.005 <10 <1 MW -21S 9/3/2013 45 39.7 57 380 <1 <5 <0.005 61 <1 MW -21S 1/13/2014 26 18.5 38 297 <1 <5 <0.005 27 <1 M W -21S MW -21S M W -21S MW -21S _ M W -21S MW -215 5/5/2014 9/8/2014 1/5/2015 5/4/2015 9/1/2015 9/10/2015 61 33 19 35 24 -- 21.2 31.6 32.9 21.2 43.5 -- 58 49 35 50 45 -- 215 324 279 185 248 -- <1 <1 <1 <1 <1 -- <5 <5 <5 <5 <5 -- <0.005 <0.005 <0.005 <0.005 <0.005 -- 187 30 29 292 178 -- <1 <1 <1 <1 <1 MW-21S 1/4/2016 20 39.5 45 254 <1 <5 <0.005 51 <1 MW -21S 5/2/2016 39 16.8 40 235 <1 <5 <0.005 70 <1 MW -21D 1/4/2011 310 <1 47 227 <1 <5 <0.005 231 <1 MW -21D 5/5/2011 340 <1 47 216 <1 <5 <0.005 238 <1 MW -21D 9/7/2011 320 <1 43 210 <1 <5 <0.005 212 <1 MW -21D 1/12/2012 340 <1 48 217 <1 <5 <0.005 208 <1 MW -21D 5/7/2012 350 <1 50 215 <1 <5 <0.005 250 <1 MW -21D 9/4/2012 320 <1 49 216 <1 <5 <0.005 218 <1 MW -21D 1/7/2013 340 <1 48 213 <1 <5 <0.005 235 <1 MW -21D 5/7/2013 340 <1 46 197 <1 <5 <0.005 151 <1 MW -21D 9/3/2013 310 <1 49 217 <1 <5 <0.005 259 <1 MW -21D 1/13/2014 320 <1 47 209 <1 <5 <0.005 172 <1 MW -21D 5/5/2014 330 <1 46 200 <1 <5 <0.005 158 <1 MW -21D 9/8/2014 140 <1 43 210 <1 <5 <0.005 192 <1 MW -21D 1/5/2015 270 <1 42 205 <1 <5 <0.005 196 <1 MW -21D 5/4/2015 290 <1 49 219 <1 <5 <0.005 701 <1 MW -21D 9/1/2015 250 <1 43 215 <1 <5 <0.005 482 <1 MW -21D 1/4/2016 270 <1 49 245 <1 <5 <0.005 376 <1 MW -21D 5/2/2016 300 <1 46 296 <1 <5 <0.005 202 <1 MW -22S 1/12/2012 4.7 4.6 87 559 <1 <5 <0.005 17000 <1 MW -22S MW -22S M W -22S 5/7/2012 9/4/2012 1/7/2013 5 7.8 1.7 1.59 <1 <1 85 71 72 548 635 609 <1 <1 <1 <5 <5 <5 <0.005 <0.005 <0.005 19400 14100 13900 1.5 <1 <1 M W -22S 5/7/2013 65 <1 49 903 <1 <5 <0.005 9360 <1 MW -22S 9/3/2013 6.9 <1 72 672 <1 <5 <0.005 13700 <1 MW -22S 1/13/2014 40 <1 57 829 <1 <5 <0.005 7770 <1 M W -22S 5/5/2014 5.7 <1 64 651 <1 <5 <0.005 12500 _ <1 MW -22S 9/8/2014 11 <1 63 697 Page 11 of 18 <1 <5 <0.005 12400 <1 Dan River Steam Station 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 15 Units: mg/L µg/L µg/L µg/L µg/L µg/L mg/L µg/L µg/L 11200 <1 MW -22D 1/12/2012 110 1.26 46 743 <1 <5 MW -22S 1/5/2015 6.8 <1 72 626 <1 <5 <0.005 14700 <1 MW -22S 5/4/2015 3.9 1.98 90 523 <1 <5 <0.005 7250 <1 M W -22S 9/1/2015 4.3 <1 80 580 <1 <5 <0.005 17900 <1 MW -22S 1/4/2016 13 1.26 78 565 <1 <5 <0.005 7340 <1 M W -22S 5/2/2016 50 <1 59 865 <1 <5 <0.005 11200 <1 MW -22D 1/12/2012 110 1.26 46 743 <1 <5 0.007 1010 5.4 MW -22D 5/7/2012 98 <1 32 711 <1 <5 <0.005 24 <1 MW -22D 9/5/2012 100 <1 42 622 <1 <5 <0.005 829 2.36 MW -22D 1/7/2013 99 <1 32 793 <1 <5 <0.005 36 <1 MW -22D 5/8/2013 -- <1 36 657 <1 <5 <0.005 256 1.32 MW -22D 9/4/2013 95 <1 49 773 <1 <5 <0.005 776 2.25 MW -22D 1/13/2014 94 <1 42 771 <1 <5 <0.005 342 1.11 MW -22D 5/5/2014 92 <1 39 789 <1 <5 <0.005 263 <1 MW -22D 9/8/2014 92 <1 41 774 <1 <5 <0.005 162 <1 MW -22D 1/5/2015 110 1 43 760 <1 <5 <0.005 164 <1 MW -22D 5/4/2015 110 <1 46 757 <1 <5 <0.005 139 <1 MW -22D 9/1/2015 -- <1 44 746 <1 <5 <0.005 101 <1 MW -22D 1/4/2016 120 <1 44 725 <1 <5 <0.005 57 <1 MW -22D 5/2/2016 120 1.27 46 806 <1 <5 <0.005 68 <1 MW -23D 1/4/2011 30 <1 71 <50 <1 <5 <0.005 326 <1 MW -23D 5/5/2011 46 <1 38 <50 <1 <5 <0.005 592 <1 MW -23D 9/7/2011 31 <1 34 <50 <1 <5 <0.005 1050 <1 MW -23D 1/12/2012 23 <1 35 <50 <1 <5 <0.005 1410 <1 MW -23D 5/7/2012 31 <1 93 <50 <1 <5 <0.005 1700 1.15 MW -23D 9/4/2012 31 <1 108 <50 <1 <5 <0.005 517 <1 MW -23D 1/7/2013 33 <1 49 <50 <1 <5 <0.005 522 <1 MW -23D 5/8/2013 31 <1 68 <50 <1 <5 <0.005 71 <1 MW -23D 9/4/2013 30 <1 112 <50 <1 <5 <0.005 211 <1 MW -23D 1/13/2014 27 <1 29 <50 <1 <5 <0.005 969 <1 MW -23D 5/5/2014 31 <1 88 <50 <1 <5 <0.005 696 <1 MW -23D 9/8/2014 39 <1 48 <50 <1 <5 <0.005 1430 <1 MW -23D 1/5/2015 32 <1 53 <50 <1 <5 <0.005 852 <1 MW -23D 5/4/2015 31 <1 74 <50 <1 <5 <0.005 404 <1 MW -23D MW -23D 9/1/2015 1/4/2016 29 26 <1 <1 110 51 <50 <50 <1 <1 <5 <5 <0.005 <0.005 618 202 <1 <1 MW -23D 5/2/2016 22 <1 34 60 <1 <5 <0.005 1340 <1 Notes: 1. °C indicates temperature measured in degrees celsius 2. mV indicates oxidation/reduction potential measured in millivolts 3. µ�2/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 Page 12 of 18 Dan River Steam Station CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells Dan River Steam Station Page 13 of 18 CSA Supplement 2 NCAC 2L Standard: Units: 50 µg/L 0.2 µg/L 100 µg/L 1 mg/L 1 µg/L 20 µg/L 1 µg/L NS NTU � M W-9 MW-9 MW-9 MW-9 M W-9 MW-9 MW-9 MW-9 MW-9 MW-9 MW-9 M W-9 MW-9 MW-9 MW-9 MW-9 MW-9 M W-9 -�. 11/29/1993 4/4/1994 5/23/1994 11/28/1994 5/8/1995 11/28/1995 4/18/1996 10/17/1996 4/17/1997 10/15/1997 4/21/1998 10/27/1998 4/6/1999 10/28/1999 4/10/2000 10/11/2000 4/23/2001 10/8/2001 1429 4672 3891 4961 5200 5296 5570 5700 6091 6222 7027 6331 6861 6455 7132 7048 _ 6693 6720 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 0.017 <0.002 0.021 <0.005 0.011 <0.005 <0.005 0.007 <0.005 <0.005 0.005 0.005 <0.005 0.006 0.02 0.018 0.021 <0.005 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- <5 4.3 1.9 3.8 <1 5.8 <1 <1 <1 <2 <2 <2 <2 <2 <2 <2 <2 <2 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 5 MW -9 4/22/2002 5000 -- -- 0.029 -- <2 <0.1 624 MW -9 10/17/2002 5677 -- -- <0.02 -- <2 <0.1 -- MW-9 4/22/2003 6535 -- -- <0.02 -- <2 <0.1 3 MW -9 10/15/2003 6463 -- -- <0.02 -- <2 <0.1 4.97 M W-9 4/15/2004 6776 -- -- <0.02 -- <2 <0.1 -- MW-9 10/6/2004 6543 -- -- <0.02 -- <2 <0.1 -- MW-9 4/27/2005 6993 -- -- <0.02 -- <2 <0.1 -- MW-9 10/19/2005 7035 -- -- <0.005 -- <2 <0.1 8.62 MW -9 4/11/2006 6781 -- <40 <0.005 -- <2 <0.1 17.3 M W-9 10/25/2006 6940 -- 2.8 0.005 -- <2 <0.2 7.28 MW -9 4/11/2007 7058 -- 2.16 <0.005 -- <2 <0.1 16.2 MW -9 10/22/2007 5196 -- 3.15 <0.005 -- <2 <0.5 5.11 MW -9 4/21/2008 6250 -- 3.63 <0.005 -- <2 <0.05 4.29 MW -9 10/13/2008 5950 -- 49.9 <0.005 -- <2 <0.05 1.5 MW -9 4/14/2009 5980 -- 2.68 <0.005 -- <2 <0.05 1.67 MW -9 10/21/2009 5910 -- 2.07 <0.005 -- <1 <0.05 3.14 MW -9 4/7/2010 6160 -- 2.1 <0.005 -- <1 <0.05 3.47 MW -9 10/6/2010 5510 -- 2.96 <0.005 -- <1 <0.05 3.16 M W-9 1/4/2011 6640 <1 <5 <0.005 <1 <1 <0.05 5.8 MW -9 5/5/2011 6470 <0.2 <5 <0.005 <1 <1 <0.05 6.47 MW -9D 4/21/2008 1060 -- 3.94 <0.005 -- <2 <0.05 22.8 MW -9D 10/13/2008 870 -- 3.22 <0.005 -- <2 <0.05 7.66 MW -9D 4/14/2009 825 -- 3.29 <0.005 -- <2 <0.05 5.04 MW -9D 10/21/2009 901 -- 3.93 <0.005 -- <1 <0.05 60.4 MW -9D 4/7/2010 850 -- 3.65 <0.005 -- <1 <0.05 53 MW -9D 10/6/2010 692 -- 3.06 <0.005 -- <1 <0.05 10.2 MW -9D 1/4/2011 714 <1 <5 <0.005 <1 <1 <0.05 3.73 MW -9D 5/5/2011 701 <0.2 <5 <0.005 <1 <1 <0.05 10.4 MW -9D 9/7/2011 714 <0.2 <5 <0.005 <1 <1 <0.05 6.21 MW -10 11/29/1993 883 -- -- <0.01 -- <5 <0.1 -- MW-10 4/4/1994 440 -- -- 0.004 -- 3.5 <0.1 -- MW-10 5/23/1994 412 -- -- 0.028 -- <1 <0.1 -- MW-10 11/28/1994 459 -- -- <0.005 -- 1.7 <0.1 -- Dan River Steam Station Page 13 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells � MW -10 NCAC 2L Standard: Units: -�. 5/8/1995 50 µg/L 520 0.2 µg/L -- 100 µg/L -- 1 mg/L 0.006 1 µg/L � -- 20 µg/L <1 1 µg/L <0.1 NS NTU .. -- MW-10 11/28/1995 378 -- -- <0.005 -- 1.1 <0.1 -- MW -10 4/18/1996 330 -- -- <0.005 -- <1 <0.1 -- MW-10 10/17/1996 240 -- -- <0.005 -- <1 <0.1 -- MW-10 MW-10 MW-10 MW-10 MW-10 MW-10 MW-10 M W-10 MW-10 M W-10 MW -10 MW -10 MW-10 M W-10 MW -10 4/17/1997 10/15/1997 4/21/1998 10/27/1998 4/6/1999 10/28/1999 4/10/2000 10/11/2000 4/23/2001 10/8/2001 4/22/2002 10/17/2002 4/22/2003 10/15/2003 4/15/2004 334 321 371 712 747 770 693 1027 904 1171 900 622 1170 1741 1995 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 0.009 0.005 0.005 <0.005 <0.005 <0.005 0.006 0.03 0.012 0.009 0.005 <0.02 <0.02 <0.02 <0.02 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- <1 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <0.1 <0.1 <0.1 <0.1 <0.1 0.72 0.15 0.91 0.39 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 -- -- -- -- -- -- -- -- -- 56 6.26 -- 55 2.41 -- M W-10 10/6/2004 1633 -- -- <0.02 -- <2 <0.1 -- MW-10 4/27/2005 1829 -- -- <0.02 -- <2 <0.1 -- M W-10 10/19/2005 1708 -- -- <0.005 -- <2 <0.1 5.73 MW -10 4/11/2006 1826 -- <40 <0.005 -- <2 <0.1 15.7 M W-10 10/25/2006 1846 -- 7.35 <0.005 -- <2 <0.2 5.16 MW -10 4/11/2007 1950 -- 7.71 0.009 -- <2 <0.1 16.9 MW -10 10/22/2007 441 -- 3.12 <0.005 -- <2 <0.5 1.44 MW -10 4/21/2008 1940 -- 7.42 <0.005 -- <2 <0.05 5.68 M W-10 10/13/2008 1860 -- 7.62 <0.005 -- <2 <0.05 1.51 MW -10 4/14/2009 1620 -- 6.98 0.01 -- <2 <0.05 4.47 MW -10 10/21/2009 429 -- 2.71 <0.005 -- <1 <0.05 3.53 MW -10 4/7/2010 1820 -- 6.3 0.008 -- <1 <0.05 37.3 M W-10 10/6/2010 1440 -- 6.48 <0.005 -- <1 <0.05 2.34 M W-10 1/4/2011 1620 <1 6 <0.005 <1 <1 <0.05 5.6 MW -10 5/5/2011 1550 <0.2 6 0.019 <1 <1 <0.05 23.2 MW -10D 4/21/2008 1610 -- 2.29 <0.005 -- <2 <0.05 3.49 MW -10D 10/13/2008 1280 -- <2 <0.005 -- <2 <0.05 1 MW -10D 4/14/2009 1220 -- <2 <0.005 -- <2 <0.05 2.07 MW -10D 10/21/2009 1110 -- 1.84 <0.005 -- <1 <0.05 3.12 MW -10D 4/7/2010 1130 -- 1.7 <0.005 -- <1 <0.05 2.44 MW -10D 10/6/2010 1090 -- 1.5 <0.005 -- <1 <0.05 1.33 MW -10D 1/4/2011 1120 <1 <5 <0.005 <1 <1 <0.05 0.7 MW -10D 5/5/2011 1120 <0.2 <5 <0.005 <1 <1 <0.05 2.39 MW -10D 9/7/2011 1080 <0.2 <5 <0.005 <1 <1 <0.05 0.73 MW -11 11/29/1993 595 -- -- <0.01 -- <5 <0.1 -- MW-11 4/4/1994 530 -- -- 0.016 -- 3.6 <0.1 -- MW-11 5/23/1994 610 -- -- 0.025 -- 1.1 <0.1 -- MW-11 11/28/1994 630 -- -- 0.016 -- <1 <0.1 -- MW-11 5/8/1995 680 -- -- 0.017 -- <1 <0.1 -- MW-11 11/28/1995 596 -- -- 0.014 -- <1 <0.1 -- MW-11 4/18/1996 610 -- -- 0.013 -- <1 <0.1 -- MW-11 10/17/1996 640 -- -- 0.017 -- <1 <0.1 -- Dan River Steam Station Page 14 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells � MW -11 NCAC 2L Standard: Units: -�. 4/17/1997 50 µg/L 475 0.2 µg/L -- 100 µg/L -- 1 mg/L 0.011 1 µg/L -- 20 µg/L <1 1 µg/L <0.1 NS NTU -- MW-11 10/15/1997 499 -- -- 0.018 -- <2 <0.1 -- MW-11 4/21/1998 496 -- -- 0.006 -- <2 0.1 -- MW-11 10/27/1998 598 -- -- 0.011 -- <2 <0.1 -- MW-11 4/6/1999 706 -- -- 0.017 -- <2 <0.1 -- MW-11 10/28/1999 839 -- -- 0.013 -- <2 <0.1 -- MW-11 4/11/2000 813 -- -- 0.011 -- <2 <0.1 -- MW-11 10/11/2000 970 -- -- 0.019 -- <2 <0.1 -- M W-11 4/23/2001 1215 -- -- 0.041 -- <2 <0.1 -- M W-11 10/8/2001 1033 -- -- 0.016 -- <2 <0.1 24 M W-11 4/22/2002 1300 -- -- 0.012 -- <2 <0.1 42.4 M W-11 10/17/2002 1297 -- -- <0.02 -- <2 <0.1 -- M W-11 4/22/2003 1171 -- -- <0.02 -- <2 <0.1 49 MW -11 10/15/2003 937 -- -- <0.02 -- <2 <0.1 57.8 MW -11 4/15/2004 937 -- -- <0.02 -- <2 <0.1 -- MW-11 10/6/2004 934 -- -- <0.02 -- <2 <0.1 -- M W-11 4/27/2005 1015 -- -- <0.02 -- <2 <0.1 -- MW-11 10/19/2005 883 -- -- <0.005 -- <2 <0.1 13.5 M W-11 4/11/2006 1007 -- <40 0.007 -- <2 <0.1 25 MW -11 10/25/2006 923 -- 6.09 0.007 -- <2 <0.2 15.9 MW -11 4/11/2007 951 -- 6.22 0.008 -- <2 <0.1 20.2 MW -11 10/22/2007 827 -- 5.68 0.008 -- <2 <0.5 2.17 _ MW -11 4/21/2008 931 -- 6.43 0.006 -- <2 <0.05 17.3 _ MW -11 10/13/2008 833 -- 6.15 0.006 -- <2 <0.05 15.5 M W-11 4/14/2009 1030 -- 7.1 <0.005 -- <2 <0.05 38.8 MW -11 10/21/2009 961 -- 6.34 <0.005 -- <1 <0.05 4.42 MW -11 4/7/2010 898 -- 6.1 0.006 -- <1 <0.05 10.5 MW -11 10/6/2010 687 -- 4.66 <0.005 -- <1 <0.05 7.71 M W-11 1/4/2011 882 <1 5 0.011 <1 <1 <0.05 89.6 M W-11 5/5/2011 901 <0.2 5 <0.005 <1 <1 <0.05 18.3 MW -11D 4/21/2008 1240 -- 39.2 0.157 -- <2 <0.05 0 MW -11D 10/13/2008 432 -- 13.5 0.06 -- <2 <0.05 795 MW -11D 4/14/2009 220 -- 9.18 0.033 -- <2 <0.05 313 MW -11D 10/21/2009 29.6 -- 2.25 <0.005 -- <1 <0.05 141 MW -11D 4/7/2010 71 -- 2.9 0.007 -- <1 <0.05 46.1 MW -11D 10/6/2010 26 -- 1.38 <0.005 -- <1 <0.05 13.6 MW -11D 1/4/2011 39 <1 <5 <0.005 <1 <1 <0.05 5.96 MW -11D 5/5/2011 41 <0.2 <5 <0.005 <1 <1 <0.05 23 MW -12 11/28/1995 718 -- -- 0.08 -- 2.9 <0.1 -- MW-12 4/18/1996 500 -- -- 0.067 -- <1 <0.1 -- MW-12 10/17/1996 340 -- -- 0.14 -- <1 <0.1 -- MW-12 4/17/1997 339 -- -- 0.05 -- <1 <0.1 -- MW-12 10/15/1997 439 -- -- 0.049 -- <2 <0.1 -- MW-12 4/21/1998 1553 -- -- 0.393 -- <2 0.13 -- MW-12 10/27/1998 340 -- -- 0.069 -- <2 <0.1 -- MW-12 4/6/1999 361 -- -- 0.057 -- <2 <0.1 -- MW-12 10/28/1999 910 -- -- 0.175 -- <2 <0.1 -- MW-12 4/10/2000 271 -- -- 0.289 -- <2 <0.1 -- MW-12 10/11/2000 478 -- -- 0.22 -- <2 <0.1 -- MW-12 4/23/2001 572 -- -- 0.034 -- <2 <0.1 -- M W-12 10/8/2001 398 -- -- 0.153 -- <2 <0.1 52 Dan River Steam Station Page 15 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells � MW -12 NCAC 2L Standard: Units: -�. 4/22/2002 50 µg/L 560 0.2 µg/L -- 100 µg/L -- 1 mg/L 0.16 1 µg/L � -- 20 µg/L <2 1 µg/L <0.1 NS NTU .. 583 MW -12 10/17/2002 737 -- -- 0.215 -- <2 <0.1 -- MW -12 4/22/2003 387 -- -- 0.073 -- <2 <0.1 2 MW -12 10/15/2003 389 -- -- 0.06 -- <2 <0.1 120 MW -12 4/15/2004 777 -- -- 0.167 -- <2 <0.1 -- MW-12 10/6/2004 523 -- -- 0.099 -- <2 <0.1 -- MW-12 4/27/2005 561 -- -- 0.107 -- <2 <0.1 -- MW-12 10/19/2005 481 -- -- 0.103 -- <2 <0.1 44.3 MW -12 4/11/2006 516 -- <40 0.136 -- <2 <0.1 112 MW -12 10/25/2006 772 -- 24.96 0.166 -- <2 <0.2 455 MW -12 4/11/2007 442 -- 11.96 0.161 -- <2 <0.1 24.2 MW -12 10/22/2007 456 -- 11.38 0.145 -- <2 <0.5 17.1 MW -12 4/21/2008 532 -- 13.3 0.17 -- <2 <0.05 58.1 MW -12 10/13/2008 501 -- 12.4 0.206 -- <2 <0.05 81 MW -12 4/14/2009 407 -- 12.5 0.193 -- <2 <0.05 12.8 MW -12 10/21/2009 414 -- 11.6 0.266 -- <1 <0.05 42.5 MW -12 4/7/2010 381 -- 11.1 0.237 -- <1 <0.05 7.2 MW -12 10/6/2010 410 -- 10.1 0.157 -- <1 <0.05 6.92 MW -12D 4/21/2008 1230 -- 5.2 0.012 -- <2 <0.05 4.58 MW -12D 10/13/2008 1220 -- 4.6 0.011 -- <2 <0.05 1.88 MW -12D 4/14/2009 1260 -- 4.48 0.011 -- <2 <0.05 6.38 MW -12D 10/21/2009 1360 -- 4.7 0.009 -- <1 <0.05 8.86 MW -12D 4/7/2010 1310 -- 4.7 0.012 -- <1 <0.05 7.97 MW -12D 10/6/2010 1300 -- 4.3 0.008 -- <1 <0.05 7.38 M W -20S 1/4/2011 880 <1 <5 <0.005 <1 <1 <0.05 11 MW -20S 5/5/2011 914 <0.2 <5 <0.005 <1 <1 <0.05 5.21 MW -20S 9/7/2011 889 <0.2 <5 <0.005 <1 <1 <0.05 10.9 MW -20S 1/12/2012 894 <0.2 <5 <0.005 <1 <1 <0.05 2.2 M W -20S 5/7/2012 945 <0.2 <5 <0.005 1.04 <1 <0.05 6.91 MW -20S 9/4/2012 923 <0.2 <5 <0.005 <1 <1 <0.05 4.38 MW -20S 1/7/2013 864 <0.2 <5 <0.005 <1 <1 <0.05 2.28 MW -20S 5/7/2013 939 <0.2 <5 <0.005 <1 <1 <0.05 7.41 MW -20S 9/4/2013 908 <0.2 <5 0.005 <1 <1 <0.05 7 MW -20S 1/13/2014 901 <0.2 <5 <0.005 <1 <1 <0.05 5.1 M W -20S 5/5/2014 888 <0.2 <5 <0.005 <1 <1 <0.05 7.3 MW -20S 9/8/2014 874 <0.2 <5 0.007 <1 <1 <0.05 5.11 M W -20S 1/5/2015 828 <0.2 <5 0.008 <1 <1 <0.05 7.07 MW -20S 5/4/2015 789 <0.2 <5 <0.005 <1 <1 <0.05 4.53 MW -20S 9/1/2015 840 <0.2 <5 <0.005 <1 <1 <0.05 2.82 MW -20S 1/4/2016 864 <0.2 <5 <0.005 <1 <1 <0.05 3.24 MW -20S 5/2/2016 862 <0.2 <5 <0.005 <1 <1 <0.05 2.57 MW -20D 1/4/2011 512 <1 <5 <0.005 <1 <1 <0.05 4.16 MW -20D 5/5/2011 510 <0.2 <5 <0.005 <1 <1 <0.05 2.04 MW -20D 9/7/2011 489 <0.2 <5 <0.005 <1 <1 <0.05 8.07 MW -20D 1/12/2012 506 <0.2 <5 <0.005 <1 <1 <0.05 1.39 MW -20D 5/7/2012 510 <0.2 <5 <0.005 <1 <1 <0.05 2.15 MW -20D 9/4/2012 519 <0.2 <5 <0.005 <1 <1 <0.05 0.63 MW -20D 1/7/2013 513 <0.2 <5 <0.005 <1 <1 <0.05 0.92 MW -20D 5/7/2013 503 <0.2 <5 <0.005 <1 <1 <0.05 2.7 MW -20D 9/4/2013 522 <0.2 <5 <0.005 <1 <1 <0.05 3.06 MW -20D 1/13/2014 528 <0.2 <5 <0.005 <1 <1 <0.05 1.64 Dan River Steam Station Page 16 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells � MW -20D NCAC 2L Standard: Units: -�. 5/5/2014 50 µg/L 511 0.2 µg/L <0.2 100 µg/L <5 1 mg/L <0.005 1 µg/L <1 20 µg/L <1 1 µg/L <0.05 NS NTU 3.6 MW -20D 9/8/2014 531 <0.2 <5 <0.005 <1 <1 <0.05 2.72 MW -20D 1/5/2015 524 <0.2 <5 <0.005 <1 <1 <0.05 2.99 MW -20D 5/4/2015 501 <0.2 <5 <0.005 <1 <1 <0.05 0.35 MW -20D MW -20D MW -20D MW -21S 9/1/2015 1/4/2016 5/2/2016 1/4/2011 533 553 523 306 0.448 <0.2 <0.2 <1 <5 <5 <5 <5 <0.005 <0.005 <0.005 <0.005 1.1 1.06 <1 1.19 <1 <1 <1 <1 <0.05 <0.05 <0.05 <0.05 1.47 2.2 1.35 5.67 MW -21S M W -21S MW -21S MW -21S MW -21S MW -21S M W -21S MW -21S MW -21S MW -21S MW -21S MW -21S MW -21S _ MW -21S MW -21S 5/5/2011 9/7/2011 1/12/2012 5/7/2012 9/4/2012 1/7/2013 5/7/2013 9/3/2013 1/13/2014 5/5/2014 9/8/2014 1/5/2015 5/4/2015 9/1/2015 9/10/2015 345 342 424 567 584 668 672 748 808 1530 1070 659 1090 758 -- <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 -- <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 -- <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 -- 1.02 1.19 <1 1.33 <1 <1 <1 <1 <1 <1 <1 <1 <1 1.24 -- <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 <0.05 <0.05 <0.05 <0.05 <0.05 -- 1.46 3.62 1.47 1.32 0.78 0.89 2.45 2.48 2.06 4.49 2.3 2.82 2.57 3.11 5.1 _ MW -21S 1/4/2016 1090 <0.2 <5 <0.005 <1 <1 <0.05 1.08 MW -21S 5/2/2016 903 <0.2 <5 <0.005 <1 <1 <0.05 0.99 MW -21D 1/4/2011 934 <1 <5 <0.005 <1 <1 <0.05 3.53 MW -21D 5/5/2011 997 <0.2 <5 <0.005 <1 <1 <0.05 1.58 MW -21D 9/7/2011 901 <0.2 <5 0.006 <1 <1 <0.05 4.16 MW -21D 1/12/2012 959 <0.2 <5 0.005 <1 <1 <0.05 0.64 MW -21D 5/7/2012 1050 <0.2 <5 <0.005 <1 <1 <0.05 0.83 MW -21D 9/4/2012 1000 <0.2 <5 <0.005 <1 <1 <0.05 0.4 MW -21D 1/7/2013 998 <0.2 <5 <0.005 <1 <1 <0.05 0.99 MW -21D 5/7/2013 957 <0.2 <5 <0.005 <1 <1 <0.05 2.32 MW -21D 9/3/2013 1070 <0.2 <5 <0.005 <1 <1 <0.05 3.82 MW -21D 1/13/2014 1020 <0.2 <5 <0.005 <1 <1 <0.05 1.38 MW -21D 5/5/2014 988 <0.2 <5 <0.005 <1 <1 <0.05 4.1 MW -21D 9/8/2014 997 <0.2 <5 <0.005 <1 <1 <0.05 1.83 MW -21D 1/5/2015 925 <0.2 <5 <0.005 <1 <1 <0.05 2.34 MW -21D 5/4/2015 1010 <0.2 <5 <0.005 <1 <1 <0.05 1.37 MW -21D 9/1/2015 820 <0.2 <5 <0.005 1.05 <1 <0.05 5.44 MW -21D 1/4/2016 911 <0.2 <5 <0.005 <1 <1 <0.05 2.54 MW -21D 5/2/2016 862 <0.2 <5 <0.005 <1 <1 <0.05 0.61 MW -22S 1/12/2012 701 <0.2 <5 <0.005 <1 <1 <0.05 13.3 MW -22S 5/7/2012 774 <0.2 <5 <0.005 <1 <1 <0.05 13 MW -22S 9/4/2012 743 <0.2 <5 <0.005 <1 <1 <0.05 8.75 MW -22S 1/7/2013 806 <0.2 <5 <0.005 <1 <1 <0.05 9.03 MW -22S 5/7/2013 597 <0.2 <5 <0.005 <1 <1 <0.05 9.4 MW -22S 9/3/2013 836 <0.2 <5 <0.005 <1 <1 <0.05 8.03 MW -22S 1/13/2014 663 <0.2 <5 <0.005 <1 <1 <0.05 2.13 MW -22S 5/5/2014 861 <0.2 <5 <0.005 <1 <1 <0.05 2.13 MW -22S 9/8/2014 873 <0.2 <5 <0.005 <1 <1 <0.05 1.62 Dan River Steam Station Page 17 of 18 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells Notes: 1. �C indicates temperature measured in degrees celsius 2. mV indicates oxidation/reduction potential measured in millivolts 3. µt2/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 Dan River Steam Station Page 18 of 18 CSA Supplement 2 NCAC 2L Standard: Units: 50 µg/L 0.2 µg/L 100 µg/L 1 mg/L 1 µg/L 20 µg/L 1 µg/L NS NTU MW -22S MW -22S MW -22S MW -22S MW -22S MW -22D MW -22D 1/5/2015 5/4/2015 9/1/2015 1/4/2016 5/2/2016 1/12/2012 5/7/2012 924 559 965 734 756 261 7 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <5 <5 <5 <5 <5 5 <5 <0.005 <0.005 <0.005 <0.005 <0.005 0.013 <0.005 <1 <1 <1 1.72 <1 1.23 1.6 <1 <1 <1 <1 <1 <1 <1 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 6.52 7.6 3.03 3.29 3.29 80.3 2.32 MW -22D 9/5/2012 145 <0.2 <5 <0.005 <1 1.5 <0.05 53.5 MW -22D 1/7/2013 <5 <0.2 <5 <0.005 1.06 <1 <0.05 3.1 MW -22D 5/8/2013 66 <0.2 <5 <0.005 1.06 1.16 <0.05 9.2 MW -22D 9/4/2013 159 <0.2 <5 <0.005 <1 1.09 <0.05 34.2 MW -22D 1/13/2014 70 <0.2 <5 <0.005 <1 <1 <0.05 11.2 MW -22D 5/5/2014 54 <0.2 <5 <0.005 <1 <1 <0.05 7.3 MW -22D 9/8/2014 37 <0.2 <5 <0.005 <1 <1 <0.05 3.89 MW -22D MW -22D MW -22D MW -22D MW -22D 1/5/2015 5/4/2015 9/1/2015 1/4/2016 5/2/2016 35 23 16 10 13 <0.2 <0.2 <0.2 <0.2 <0.2 <5 <5 <5 <5 <5 <0.005 <0.005 <0.005 <0.005 <0.005 <1 1.63 1.25 1.93 <1 <1 <1 <1 <1 <1 <0.05 <0.05 <0.05 <0.05 <0.05 4.75 3.19 4.35 3.78 3.95 MW -23D 1/4/2011 403 <1 <5 <0.005 <1 <1 <0.05 13.8 MW -23D 5/5/2011 21 <0.2 <5 <0.005 <1 <1 <0.05 29.1 MW -23D 9/7/2011 26 <0.2 <5 0.009 <1 <1 <0.05 52 MW -23D 1/12/2012 45 <0.2 <5 0.009 <1 <1 <0.05 75.2 MW -23D 5/7/2012 192 <0.2 <5 0.01 <1 <1 <0.05 69.7 MW -23D 9/4/2012 468 <0.2 <5 <0.005 <1 <1 <0.05 70.3 MW -23D 1/7/2013 47 <0.2 <5 <0.005 <1 <1 <0.05 14.3 MW -23D 5/8/2013 61 <0.2 <5 <0.005 <1 <1 <0.05 8.21 MW -23D 9/4/2013 566 <0.2 <5 <0.005 <1 <1 <0.05 9.41 MW -23D 1/13/2014 23 <0.2 <5 <0.005 <1 <1 <0.05 19.7 MW -23D 5/5/2014 117 <0.2 <5 <0.005 <1 <1 <0.05 89.5 MW -23D 9/8/2014 45 <0.2 <5 0.006 <1 <1 <0.05 24.4 MW -23D 1/5/2015 27 <0.2 <5 0.007 <1 <1 <0.05 19.6 MW -23D 5/4/2015 39 <0.2 <5 <0.005 <1 <1 <0.05 22.7 MW -23D MW -23D MW -23D 9/1/2015 1/4/2016 5/2/2016 493 71 18 <0.2 <0.2 <0.2 <5 <5 <5 0.008 <0.005 <0.005 1.04 1.4 <1 <1 <1 <1 <0.05 <0.05 <0.05 49.8 27.1 26.7 Notes: 1. �C indicates temperature measured in degrees celsius 2. mV indicates oxidation/reduction potential measured in millivolts 3. µt2/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 Dan River Steam Station Page 18 of 18 CSA Supplement 2 Table 1-3: 2L Groundwater Standard Exceedances from NPDES Sampling 2L Standard.: 1 10 _ Units: µg/L µg/ � �. 700 300 50 „rtii ��rtii „rti MW -205 1/4/2011-5/2/2016 1.04 No Exceedances No Exceedances 2,350-3,190 789-945 MW -20D 1/4/2011-5/2/2016 1.06-1.1 No Exceedances No Exceedances No Exceedances 489-553 MW -215 1/4/2011— 5/2/2016 1.02 —1.33 16.8 — 44.7 No Exceedances No Exceedances 306 —1,531 MW -21D 1/4/2011— 5/2/2016 1.05 No Exceedances No Exceedances 376 — 701 820 —1,071 M W -22S 1/12/2012 — 5/2/2016 1.72 No Exceedances 829 — 903 7,250 — 19,400 559 — 965 MW -22D 1/12/2012 — 5/2/2016 1.06 —1.93 No Exceedances 711— 806 342 — 1,010 54 — 261_ MW -23D 1/4/2011— 5/2/2016 1.04 —1.4 No Exceedances No Exceedances 326 — 1,700 61— 566 250,000 500,000 0.2 6.5-8.5 µg/L µg/L µg/L SU No Exceedances No Exceedances 0.45 5.82-6.24 No Exceedances No Exceedances No Exceedances No Exceedances No Exceedances No Exceedances No Exceedances 6.45 — 6.47 270,000-350,000 600,000-770,000 No Exceedances No Exceedances No Exceedances No Exceedances No Exceedances No Exceedances No Exceedances No Exceedances No Exceedances No Exceedances No Exceedances No Exceedances No Exceedances 5.67-6.49 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 Page 1 of 1 Dan River Steam Station CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments Dan River Steam Station Page 1 of 7 CSA Supplement 2 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 COIs. The approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. Use results from porewater, groundwater and other media to COIs were selected based on exceedances found in porewater, groundwater, soil, and surface water COI 3 develop COI list. sample tesults. Hexavalent Chromium is included as a COI in CAP Part 1 data tables and is considered with respect to the Cr(VI) — include as COI at each site due to interest and due to NC DHHS screening level and has been carried forward with subsequent evaluations. Samples were COI 4 receptor well results. Use NCDHHS screening 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 `^here 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. Source Characterization Soil to be identified as secondary source — due to leaching of ash 13 A separate risk assessment has been provided subsequent to the CSA report by Duke Energy via Haley & onto unsaturated soil. Aldritch. Dan River Steam Station Page 1 of 7 CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments Background site-specific conditions like wetlands). This approach includes consideration to these calcuations by flow layer 21 Use all available site data (include example background wells PHR, FGD, Craig Rd.). Background data from historical sources was utilized where applicable in the CAP Part 2. 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 seen when sampling as well as to refine understanding of exceedances. Results from the Round 5, redeveloped or replaced. 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 I and Constituents 24 approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. discussion. 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. Soil contamination plumes do not appear to be well delineated. Soil Contamination 26 Vertical delineation of COIs are noted on cross sections included in the CSA Supplement 2. Show extent of plan figures and on cross sections. Dan River Steam Station Page 2 of 7 CSA Supplement 2 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 17 Potential release mechanisms need to be considered in the CAP 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. Background site-specific conditions like wetlands). This approach includes consideration to these calcuations by flow layer 21 Use all available site data (include example background wells PHR, FGD, Craig Rd.). Background data from historical sources was utilized where applicable in the CAP Part 2. 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 seen when sampling as well as to refine understanding of exceedances. Results from the Round 5, redeveloped or replaced. 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 I and Constituents 24 approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. discussion. 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. Soil contamination plumes do not appear to be well delineated. Soil Contamination 26 Vertical delineation of COIs are noted on cross sections included in the CSA Supplement 2. Show extent of plan figures and on cross sections. Dan River Steam Station Page 2 of 7 CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments Dan River Steam Station Page 3 of 7 CSA Supplement 2 Compare soil results to Preliminary Soil Remediation Goals (PSRG) Where additional soil samples were collected as part of the installation of additional assessment wells, Soil Contamination 27 for protection of groundwater standards (POG). those results will be presented to PSRG POG standards. MRL vs. POG are issue for selected constituents; this may require Duke Energy worked with the labs to reduce the reporting limits. However, lowering the MRL to below the Soil Contamination 28 resampling. POG was not able to be achieved to date for certain constituents. Soils PSRGs, detection limits above standards is problematic. Soil Contamination 29 Review IHSS 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 POG 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 COIs in groundwater. Soils will be compared to the PSRG POG Cr(VI) standard of 3.8 mg/kg in subsequent reporting, where Soil Contamination 31 Need to compare soils results to Cr(VI) (not Cr(III)). 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 distribution 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 Hydrology/Geology and Chemical Controls g2 relative to D0, 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 COIs, 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 CAP Part 2 Section 3.7 included an expanded discussion of site geochemical controls on contaminant Chemical Controls 36 Explain why one contaminant may be elevated in a particular area. mobility and migration to address this concern. Hydrology/Geology and CAP Part 2 Section 3.7 included an expanded discussion of site geochemical controls on contaminant Chemical Controls 37 Describe how constituents are mobilized or attenuated. mobility and migration to address this concern. Describe geochemical conditions and mechanisms, and charges, The groundwater model considers linear adsorption (Freundlich adsorption for select COIs in the Buck Hydrology/Geology and along flow paths. DEQ considers flow paths to be from the model) for COIs (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 inthree-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. Dan River Steam Station Page 3 of 7 CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments Hydrology/Geology and 40 Chemical Controls Hydrology/Geology and 41 Chemical Controls Hydrology/Geology and Chemical Controls 42 Show measured water levels on ponds, streams, rivers. Pond, river, and lake elevations will be shown on figures where applicable. For example, in the CSA Supplement 2, these elevations are included on the shallow potentiometric figures, but not on all flow layers. Geochemical Conceptual The groundwater model is setup per source area and then calibrated to concentrations observed in Refined conceptual model needs to be presented in CAP I. 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, paths and how these are considered/incorporated into HGCM and adjusting hydraulic conductivity based on reported values, adjusting kd based on lab data, and other numerical models. measured hydrogeologic properties. The calibration attempts to match concentrations observed in Hydrogen and geochemical conceptual models need to be downgradient monitor wells by matching the flow paths and thus the observed COI "islands'. The model Hydrogeologic and Other did not incorporate TDS (boron and sulfate are both included in the groundwater model. CAP Part 2, discussed in terms of specific source areas. Include upgradient, Appendix B, groundwater model. Subsurface drainage systems at dike/dams should be shown and 44 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. determined across the entire site. 42 Show measured water levels on ponds, streams, rivers. Pond, river, and lake elevations will be shown on figures where applicable. For example, in the CSA Supplement 2, these elevations are included on the shallow potentiometric figures, but not on all flow layers. Geochemical Conceptual 43 Refined conceptual model needs to be presented in CAP I. Site Conceptual Models were updated and included in the CAP Part 2. Models Hydrogen and geochemical conceptual models need to be Hydrogeologic and Other discussed in terms of specific source areas. Include upgradient, CAP Part 2 Section 2.4.4 included discussion of geochemical parameters with consideration to whether Geochemical Conceptual 44 source, and downgradient. Develop narrative for each source area there are trends upgradient or downgradient from the source. The refined SCM also included flow paths Models and downgradient footprint (flow system recharge/discharge, determined across the entire site. horizontal flow direction, flow paths emanating from all sides (include map). 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 of receptor wells in discussion. Also include In CAP Part 2 Appendix C, the issue of pumping wells is discussed. Where appropriate, pumping wells are included as an influence in the groundwater model. For example, for the DEC Cliffside site, the pumping Geochemical Conceptual 46 possible impacts from basin to receptors in conceptual model wells weren't modeled because of the influence of the Broad River. Other DEC sites, such as Allen, Belews Models discussions. 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. Uncertainities 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. Uncertainities and limitations will be Models presented as part of the results, which are expected to be completed during Fall 2016. Hydrogeologic and Other Ensure that streams, wetlands, etc. shown in Section 12 are Geochemical Conceptual 49 included on all figures as needed. Include in conceptual model CAP Part 2 Section 2 figures include wetlands and streams. Models discussions as appropriate. Hydrogeologic and Other Description of AMEC ecological survey report findings not utilized Ecological data concerning vegetation was included in the CSA Section 12 Risk Assessment and referenced Geochemical Conceptual 50 in report or in figures. Data should be used, shown on figures or in the Eco -Checklists provided for each site. Models explained why not. Dan River Steam Station Page 4 of 7 CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments Dan River Steam Station Page 5 of 7 CSA Supplement 2 Batch geochemical modeling for each of three layers per 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 i 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 COIs (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 Modeling 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. Dan River Steam Station Page 5 of 7 CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments Dan River Steam Station Page 6 of 7 CSA Supplement 2 Guidelines require —seep, sediment, surface water, receptor well 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. Show concentrations above PQLs on chem box maps, not just Chem box maps show all detected constituents for detection and assessment monitoring constituents as Data Presentation 63 constituents above 2L. part of the CAP Part 2. CAP Part 1 Section 3 included figures depicting vertical gradients between shallow and deep wells, and. Data Presentation 64 Add vertical gradients to figures —plan view. between deep and bedrock wells. Data Presentation 65 Add vertical gradient maps: CAP Part 15ection 3 includes figures depicting vertical gradients between shallow and deep wells, and between deep and bedrock wells. 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 Data Presentation 66 wells. developed as part of the CAP Part 2 as well as CSA Supplement 2. Show cation -anion balance values on Piper diagrams, remove Piper diagram figures are in Section 10 of the CSA. Updated piper diagrams utilizing Round 5 data have Data Presentation 67 results with balance differences > 10%. been included in the CSA Supplement 2 to include only those events with balance differences that are less than 10%. Show all receptor wells on figures given the existing figure Figure 13 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. Show topography on groundwater surface contour maps (add Data Presentation 71 .elevation labels to contours). Topography has been included on the potentiometric surface figures provided in CSA Supplement 2. 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, RQD, where available, as well as the vertical extent of COIs 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 (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 Data Presentation 76 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. 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 Data Presentation 79 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. Dan River Steam Station Page 6 of 7 CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments Surface, Groundwater g2 Show all surface water features on maps and cross sections. Discharge Surface, Groundwater g3 Add wording on stream flow measurements performed. Discharge CSA and CAP site maps include labels of major surface water bodies at each site. In addition, the CSA 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 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 included in the receptors, as are current/future off-site residents. In addition, a separate risk assessment drinking water well receptors. has been provided subsequent to the CSA report by Duke Energy via Haley &Aldritch. Coal ash should be included as primary affected media until itis 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 Source Areas Inadequate Data —All Source Areas Inadequate Data —All Source Areas Where 2L exceedances intercept rivers/streams implications 87 should be discussed. Discuss vertical gradients for well pairs adjacent to rivers/streams. If a MW does not exist between a 2L exceedance and receptor 88 (stream and water supply well) additional wells or transport modeling is needed to fill data gap. Vertical hydraulic gradients were calculated for Round 2 data, and were included in CAP Part 1. The patterns in vertical gradients are discussed in CAP Part 2 Section 2.3.1.1. Duke Energy has installed additional monitoring wells to address concerns to refine understanding of exceedances. Results from the Round 5, including additional assessment wells, has been included in CSA Supplement 2. 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 Same comment applies for uncertainty on vertical gradients. Supplement 2. Page 7 of 7 Dan River Steam Station CSA Supplement 2 Table 2-2: Total and Effective Porosity and Specific Storage by Flow Layer Hydrostratigraphic Unit Secondary (Effective) Porosity /Specific Yield (%) Total Porosity (%) Specific Storage (1/ft) Transition Zone (TZ) 5.0 - 10.0 5 - 15 1.0E-06 - 2.1E-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. Dan River Steam Station Page 1 of 1 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Dan River Steam Station Page 1 of 14 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: AB -10D 4/25/2016 N DR -AB -10D Round 5 AB-25BR 4/25/2016 N DR-AB-25BR Round 5 AB -25D 4/25/2016 N DR -AB -25D Round 5 AB -306R 4/25!2016 N DR-AB-30BR Round 5 AB -30D 4/25/2016 N DR -AB -30D Round 5 AB -30S 4/25/2016 N DR -AB -30S Round 5 AB-35BR 4/26/2016 N DR-AB-35BR Round 5 AB -5D 4/25/2016 N DR -AB -5D Round 5 AB -5D 4/25/2016 FD DR -AB -5D -FD Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Alkalinity, CO3 N -- ug/I 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N -- ug/I 84700 84300 61100 191000 120000 5300 254000 176000 168000 Alkalinity, lab N -- ug/I 84700 84300 J- 61100 191000 120000 5300 254000 176000 168000 Aluminum D -- ug/I 125 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Aluminum T -- ug/I 149 85.5 J 220 176 76.8 J 119 100 U 100 U 100 U Antimony D -- ug/I 2 0.5 U 0.5 U 5 U 5 U 0.5 U 5 U 5 U 5 U Antimony T 1 IMAC ug/I 2 0.5 U 0.5 U 5 U 5 U 0.5 U 5 U 5 U 0.5 U Arsenic D -- ug/I 0.29 0.15 0.12 1.2 1 U 0.088 J 12.8 3.4 3.2 Arsenic T 10 02L ug/I 0.3 0.12 0.2 1.3 1 U 0.078 J 11.3 5.6 4.8 Barium D -- ug/I 152 40.6 20.4 135 98.3 89.8 365 58.4 59 Barium T 700 02L ug/I 138 44.9 25.2 136 110 94.9 403 60.7 62.9 Beryllium D -- ug/I 0.024 J+ 0.1 U 0.016 J 0.31 J 1 U 0.55 1 U 0.12 J 0.24 J Beryllium T 4 IMAC ug/I 0.015 J+ 0.1 U 0.081 J+ 0.15 J 1 U 0.57 1 U 0.13 J 0.014 J+ Boron D -- ug/I 297 357 787 295 278 259 273 504 501 Boron T 700 02L ug/I 322 399 849 310 314 275 298 505 540 Cadmium D -- ug/I 0.08 U 0.08 U 0.08 U 0.8 U 0.8 U 0.075 J 0.8 U 0.8 U 0.8 U Cadmium T 2 02L ug/I 0.08 U 0.08 U 0.08 U 0.8 U 0.8 U 0.078 J 0.8 U 0.8 U 0.08 U Calcium T -- ug/I 39300 45600 31800 95700 64800 8940 93200 65900 J 5100 J Carbon N -- ug/I 680 J 520 J 600 J 1000 U 1000 U 550 J 1000 1000 U 1000 U Chloride N 250000 02L ug/I 16400 22200 20200 14600 20900 10000 11700 19600 20000 Chromium D -- ug/I 1 J+ 0.52 J+ 0.88 J+ 5 U 5 U 0.24 J+ 5 U 5 U 5 U Chromium T 10 02L ug/I 0.69 J+ 7.8 9.6 2.7 J 1.1 J+ 0.45 J+ 1.4 J+ 5 U 1.6 J+ Chromium 6+ T 0.07 DHHS ug/I 0.29 0.54 0.047 0.013 J 0.03 U 0.013 J 0.03 U 0.03 U 0.03 U Cobalt D -- ug/I 0.67 0.074 J 0.32 1 U 0.25 J 26.8 1 U 2.2 2 Cobalt T 1 IMAC ug/I 0.32 0.27 0.72 1 U 0.28 J 28.2 1 U 2.3 2.2 Copper D -- ug/I 2.1 J+ 0.13 J 1.3 5 U 5 U 4.4 5 U 5 U 5 U Copper T 1000 02L ug/I 1.7 0.88 0.69 5 U 5 U 0.4 J 5 U 5 U 0.5 U Iron D -- ug/I 67.3 50 U 50 U 153 134 40.8 J 99.8 972 975 Iron T 300 02L ug/I 110 78.1 260 325 220 155 102 J+ 1080 1090 Lead D -- ug/I 0.17 0.1U 0.1U 1U 1U 0.1U 1U 1U 1U Lead T 15 02L ug/I 0.1 U 0.25 0.3 1 U 1 U 0.11 1 U 1 U 0.1 U Magnesium T -- ug/I 5910 J+ 9710 12200 15200 10900 5580 18300 13800 J+ 214 J+ Manganese D -- ug/I 8.8 62.2 251 502 453 1420 279 1500 1500 Manganese T 50 02L ug/I 3.8J 68.8 324 515 520 1500 286 1490 1590 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 0.2 U 0.2 U Mercury T 1 02L ug/I 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U Methane N -- ug/I 16.4 10 U 10 U 32.9 29 50.2 46.4 38.4 34.7 Molybdenum D -- ug/I 1.9 0.94 9.5 2.5 J 5 U 0.5 U 11.5 3 J 3 J Molybdenum T -- ug/I 2.3 0.83 10.2 2.9 J 5 U 0.5 U 11.5 3.6 J 3.2 Nickel D -- ug/I 2.3 J+ 2.1 3 5 U 5 U 8.2 5 U 5 U 5 U Nickel T 100 02L ug/I 1.5 4.7 3.5 5 U 5 U 8.6 5 U 5 U 3.6 Nitrogen, NO2 plus NO3 N -- ug/I 20 U 20 U 20 U 20 U 20 U 20 U 20 U 20 U 20 U Potassium T -- ug/I 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 15300 3970 J 37400 Selenium D -- ug/I 0.43 J 0.5 U 0.5 U 5 U 5 U 0.5 U 5 U 5 U 5 U Selenium T 20 02L ug/I 0.5 U 0.5 U 0.5 U 5 U 5 U 0.39 J 5 U 5 U 0.5 U Sodium T -- ug/I 27400 J+ 25500 20700 16300 13600 25400 26200 20000 J+ 39500 J+ Strontium D -- ug/I 1210 585 125 888 419 144 699 381 382 Strontium T -- ug/I 1120 645 138 916 462 151 758 409 418 Sulfate N 250000 02L ug/I 26500 98000 84600 123000 92000 82700 121000 77500 74400 Sulfide N -- ug/I 100 U 100 UJ 100 U 100 U 100 U 100 U 480 100 U 100 U Thallium D -- ug/I 0.1U 0.1U 0.1U 1U 1U 0.1U 1U 1U 1U Thallium T 0.2 IMAC ug/I 0.1 U 0.1 U 0.1 U 1 U 1 U 0.1 U 1 U 1 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 174000 259000 223000 426000 295000 169000 428000 340000 325000 Total Organic Carbon N -- ug/I -- -- -- -- -- -- -- -- -- Total Suspended Solids N -- ug/I 22200 2500 U 2700 2600 2500 U 2500 U 14800 2500 U 2500 U Uranium, Natural T -- ug/I -- 0.15 J 0.24 J 5 U 5 U 0.5 U 0.77 J -- -- Dan River Steam Station Page 1 of 14 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 026 SWOS Class B standards. 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 02B =North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 2 of 14 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: AB -10D 4/25/2016 N DR -AB -10D Round 5 AB-25BR 4/25/2016 N DR-AB-25BR Round 5 AB -25D 4/25/2016 N DR -AB -25D Round 5 AB -306R 4/25!2016 N DR-AB-30BR Round 5 AB -30D 4/25/2016 N DR -AB -30D Round 5 AB -30S 4/25/2016 N DR -AB -30S Round 5 AB-35BR 4/26/2016 N DR-AB-35BR Round 5 AB -5D 4/25/2016 N DR -AB -5D Round 5 AB -5D 4/25/2016 FD DR -AB -5D -FD Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Vanadium D -- ug/I 1.8 0.22 J+ 0.15 J+ 3 U 3 U 0.11 J+ 0.78 J+ 0.97 J 1 J Vanadium T 0.3 IMAC ug/I 0.89 0.24 J 0.46 3 U 3 U 0.33 3 U 3 U 0.13 J Zinc D -- ug/I 2.7 J+ 10 U 10 J 2.7 J 2.7 J 38 10 U 10 U 3 J+ Zinc T 1000 02L ug/I 2.8 J 10 U 10 U 5.1 J 3.2 J 41.5 10 U 10 U 10 U Dissolved Oxygen N -- mg/I -- 0.5 0.8 0.6 0.3 0.2 0.1 -- -- Oxidation Reduction Potential N -- mV -- -22.2 69.8 -74.3 -103.3 312.1 -208.5 -- -- pH N 6.5 - 8.5 02L SU -- 7.6 6.9 7.4 7.5 5 7.5 -- -- Specific Conductivity N -- ttS/cm -- 427.3 368.5 633 472.4 245.3 750 -- -- Specific Conductivity N -- uS/cm -- -- -- -- -- -- -- -- -- Temperature N -- Deg C -- 20.5 25.3 20.7 23 20.5 21.3 -- -- Turbidity, field N -- NTU -- 1.9 8.8 8.1 5.7 7.3 7.4 -- -- 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 026 SWOS Class B standards. 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 02B =North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 2 of 14 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Dan River Steam Station Page 3 of 14 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: AS -12S 4/26/2016 N DR -AS -12S Round 5 AS -2D 4/26/2016 N DR -AS -2D Round 5 AS-8BR 4/25/2016 N DR-AS-8BR Round 5 AS-8BR 4/25/2016 FD DR-FD-AS-8BR Round 5 AS -8D 4/25/2016 N DR -AS -8D Round 5 BG -1 D 3/28/2016 N DR -BG -1 D Round 5 BG -1 D 4/4/2016 N DR -BG -1 D Round 5 BG -5D 3/28/2016 N DR -BG -5D Round 5 BG -5D 4/4/2016 N DR -BG -5D Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Alkalinity, CO3 N -- ug/I 5000 U 5000 U 5000 U 5000 U 5000 U 12100 -- 5000 U -- Alkalinity, HCO3 N -- ug/I 184000 251000 172000 185000 120000 60300 -- 116000 -- Alkalinity, lab N -- ug/I 184000 251000 J- 172000 185000 120000 72400 -- 116000 -- Aluminum D -- ug/I 100 U 50.3 J 100 U 100 U 100 U 74 J -- 100 U -- Aluminum T -- ug/I 100 U 130 100 U 100 U 100 U 106 -- 100 U -- Antimony D -- ug/I 0.5 U 5 U 5 U 5 U 0.5 U 0.96 -- 0.5 U -- Antimony T 1 IMAC ug/I 0.5 U 5 U 5 U 5 U 0.5 U 1.1 -- 0.5 U -- Arsenic D -- ug/I 0.13 1 U 1 U 1 U 0.23 2.4 -- 0.1 U -- Arsenic T 10 02L ug/I 0.21 1 U 1 U 1 U 0.16 2.1 -- 0.1 U -- Barium D -- ug/I 19.4 170 80.1 79 64.5 5 U -- 15 -- Barium T 700 02L ug/I 21.3 190 79.3 81.4 48.9 2.6 J -- 16.5 -- Beryllium D -- ug/I 0.056 J 0.27 J 0.11 J+ 1 U 0.082 J+ 0.1 U -- 0.1 U -- Beryllium T 4 IMAC ug/I 0.025 J+ 0.3 J 0.19 J 0.45 J 0.045 J+ 0.1 U -- 0.1 U -- Boron D -- ug/I 810 601 50 U 50 U 50 U 91 -- 50 U -- Boron T 700 02L ug/I 894 710 50 U 50 U 50 U 93.1 -- 50 U -- Cadmium D -- ug/I 0.08 U 0.8 U 0.8 U 0.8 U 0.08 U 0.08 U -- 0.08 U -- Cadmium T 2 02L ug/I 0.08 U 0.8 U 0.8 U 0.8 U 0.08 U 0.08 U -- 0.08 U -- Calcium T -- ug/I 37900 99400 65000 70000 27600 36100 -- 25000 -- Carbon N -- ug/I 640 J 1000 U 1000 U 1000 U 1000 U -- -- -- -- Chloride N 250000 02L ug/I 18100 17500 6800 5600 5300 -- 5900 -- 6200 Chromium D -- ug/I 0.23 J+ 5 U 5 U 1.1 J+ 0.44 J+ 6.8 -- 0.37 J -- Chromium T 10 02L ug/I 0.44 J+ 3.1 J+ 1.2 J+ 5 U 0.3 J+ 6.4 -- 0.81 J+ -- Chromium 6+ T 0.07 DHHS ug/I 0.03 U 0.03 U 0.044 0.03 U 0.03 UJ -- 4 -- 0.072 Cobalt D -- ug/I 0.67 1.4 1 U 1 U 0.062 J 0.23 -- 0.017 J -- Cobalt T 1 IMAC ug/I 0.66 1.5 1 U 1 U 0.11 0.3 -- 0.031 J -- Copper D -- ug/I 0.86 5 U 5 U 5 U 0.16 J+ 1.7 -- 0.82 -- Copper T 1000 02L ug/I 0.54 5 U 5 U 5 U 0.5 U 1.2 -- 0.5 U -- Iron D -- ug/I 38.9 J 2080 148 146 796 50 U -- 50 U -- Iron T 300 02L ug/I 322 2290 161 156 1020 54.2 -- 50 U -- Lead D -- ug/I 0.1U 1U 1U 1U 0.1U 0.1U -- 0.1U -- Lead T 15 02L ug/I 0.1 U 1 U 1 U 1 U 0.1 U 0.1 U -- 0.1 U -- Magnesium T -- ug/I 30300 33200 10200 11600 9590 11200 -- 14700 -- Manganese D -- ug/I 123 2070 966 932 933 5 U -- 41 -- Manganese T 50 02L ug/I 135 2350 892 976 668 5 U -- 13.9 -- Mercury D -- ug/I 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U -- 0.2U -- Mercury T 1 02L ug/I 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U -- 0.2U -- Methane N -- ug/I 10 U 10 U 15.4 J- 17.3 28.6 -- 1.9 J+ -- 1.5 J+ Molybdenum D -- ug/I 0.35 J 5 U 5 U 5 U 0.26 J 19.6 -- 0.29 J -- Molybdenum T -- ug/I 0.42 J 5 U 5 U 5 U 0.38 J 17.6 -- 0.25 J -- Nickel D -- ug/I 4 5 U 5 U 5 U 0.48 J 1.3 -- 0.5 U -- Nickel T 100 02L ug/I 4.1 5 U 5 U 5 U 0.57 1.1 -- 0.5 U -- Nitrogen, NO2 plus NO3 N -- ug/I 24 20 U 20 U 20 U 20 U 220 -- 240 -- Potassium T -- ug/I 5000 U 2630 J 3150 J 5000 U 5000 U 4900 J -- 5000 U -- Selenium D -- ug/I 0.5 U 5 U 5 U 5 U 0.5 U 0.75 -- 0.5 U -- Selenium T 20 02L ug/I 0.5 U 5 U 5 U 5 U 0.5 U 0.51 -- 0.5 U -- Sodium T -- ug/I 31500 28400 13800 13300 13900 29300 -- 17800 -- Strontium D -- ug/I 482 713 395 391 287 89 -- 240 -- Strontium T -- ug/I 525 806 402 406 208 112 -- 248 -- Sulfate N 250000 02L ug/I 78300 179000 69500 66800 20900 -- 106000 -- 34100 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 1 U 1 U 1 U 0.1 U 0.1 U -- 0.1 U -- Thallium T 0.2 IMAC ug/I 0.1 U 1 U 1 U 1 U 0.1 U 0.1 U -- 0.1 U -- Total Dissolved Solids N 500000 02L ug/I 302000 531000 293000 314000 193000 281000 -- 165000 -- Total Organic Carbon N -- ug/I -- -- -- -- -- 1300 -- 1000 U -- Total Suspended Solids N -- ug/I 2500 U 5700 2500 U 2500 U 2500 U 5300 U -- 2500 U -- Uranium, Natural T -- ug/I -- -- 5 U 5 U 0.5 U -- -- 0.4 J -- Dan River Steam Station Page 3 of 14 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 026 SWOS Class B standards. 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 02B =North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 4 of 14 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: AS -12S 4/26/2016 N DR -AS -12S Round 5 AS -2D 4/26/2016 N DR -AS -2D Round 5 AS-8BR 4/25/2016 N DR-AS-8BR Round 5 AS-8BR 4/25/2016 FD DR-FD-AS-8BR Round 5 AS -8D 4/25/2016 N DR -AS -8D Round 5 BG -1 D 3/28/2016 N DR -BG -1 D Round 5 BG -1 D 4/4/2016 N DR -BG -1 D Round 5 BG -5D 3/28/2016 N DR -BG -5D Round 5 BG -5D 4/4/2016 N DR -BG -5D Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Vanadium D -- ug/I 0.22 J+ 0.96 J+ 3 U 0.79 J+ 0.33 J+ 28.9 -- 0.1 J -- Vanadium T 0.3 IMAC ug/I 0.2 J 3 U 0.8 J 3 U 0.13 J 20.1 -- 0.11 J -- Zinc D -- ug/I 3.8 J+ 19.6 J+ 10 U 3 J 4.5 J 3.8 J+ -- 10 U -- Zinc T 1000 02L ug/I 5.4 J 19.4 6.4 J 2.6 J 12.9 10 U -- 10 U -- Dissolved Oxygen N -- mg/I 0.2 0.6 0.2 0.2 0.2 5.01 -- 0.97 -- Oxidation Reduction Potential N -- mV 140.8 17.9 -80.7 -80.7 -17.8 161 -- 194.3 -- pH N 6.5 - 8.5 02L SU 5.8 6 7.1 7.1 6.2 8.5 -- 6.6 -- Specific Conductivity N -- NS/cm 486 818 450.5 450.5 254.1 -- -- -- -- Specific Conductivity N -- uS/cm -- -- -- -- -- 403.2 -- 287.1 -- Temperature N -- Deg C 29.1 20.1 23 23 23.9 16.7 -- 17.1 -- Turbidity, field N -- NTU 4 8.3 2.7 2.7 1.2 3.45 -- 0.35 -- 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 026 SWOS Class B standards. 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 02B =North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 4 of 14 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Dan River Steam Station Page 5 of 14 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: BG -5S 3/28/2016 N DR -BG -5S Round 5 GWA-10D 4/26/2016 N DR-GWA-10D Round 5 GWA-11D 4/26/2016 N DR-GWA-11D Round 5 GWA-11S 4/26!2016 N DR-GWA-11S Round 5 GWA-12D 3/28/2016 N DR-GWA-12D Round 5 GWA-12S 3/28/2016 N DR-GWA-12S Round 5 GWA-14D 4/25/2016 N DR-GWA-14D Round 5 GWA-14S 4/25/2016 N DR-GWA-14S Round 5 GWA-14S 4/26/2016 N DR-GWA-14S Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Alkalinity, CO3 N -- ug/I 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U -- 5000 U Alkalinity, HCO3 N -- ug/I 73600 68000 176000 25100 201000 9700 157000 -- 45400 Alkalinity, lab N -- ug/I 73600 68000 176000 25100 201000 9700 157000 -- 45400 Aluminum D -- ug/I 65 J 100 U 100 U 55.6 J 100 U 100 100 U -- 85 J Aluminum T -- ug/I 118 92.4 J 100 U 59.4 J 100 U 812 100 U 100 U -- Antimony D -- ug/I 0.5 U 0.14 J 5 U 0.5 U 5 U 0.5 U 5 U -- 0.5 U Antimony T 1 IMAC ug/I 0.5 U 0.11 J 5 U 0.5 U 5 U 0.5 U 5 U 0.5 U -- Arsenic D -- ug/I 0.1 U 0.13 1 U 0.045 J 2.2 0.12 1 U -- 0.13 Arsenic T 10 02L ug/I 0.1 U 0.17 1 U 0.056 J 2.3 0.38 0.41 J 0.077 J -- Barium D -- ug/I 11 31.2 59.2 18.4 23 32 79.5 -- 36.5 Barium T 700 02L ug/I 18.7 33.8 61.6 20.7 24 35.9 80.4 31.5 -- Beryllium D -- ug/I 0.1 U 0.1 0.14 J 0.14 0.27 J 0.1 U 1 U -- 0.028 J+ Beryllium T 4 IMAC ug/I 0.1 U 0.15 0.25 J 0.1 J+ 0.12 J 0.068 J 0.21 J 0.012 J+ -- Boron D -- ug/I 50 U 206 50 U 107 50 U 50 U 238 -- 50 U Boron T 700 02L ug/I 50 U 237 30.5 J 126 50 U 50 U 239 50 U -- Cadmium D -- ug/I 0.08 U 0.08 U 0.8 U 0.08 U 0.8 U 0.08 U 0.8 U -- 0.08 U Cadmium T 2 02L ug/I 0.08 U 0.08 U 0.8 U 0.08 U 0.8 U 0.08 U 0.8 U 0.08 U -- Calcium T -- ug/I 16800 22900 50500 5470 50900 6760 78200 8970 -- Carbon N -- ug/I -- 1000 U 1000 U 1000 U -- -- 1000 U 640 J -- Chloride N 250000 02L ug/I 6700 9300 11200 10400 4000 3300 12100 -- 5500 Chromium D -- ug/I 0.64 1.8 J+ 5 U 14.1 5 U 0.61 5 U -- 0.56 J+ Chromium T 10 02L ug/I 0.81 J+ 1.9 1.8 J+ 5.8 J+ 5 U 2.2 J+ 5 U 0.4 J+ -- Chromium 6+ T 0.07 DHHS ug/I 0.45 0.57 0.03 U 0.16 0.03 U 0.27 0.03 U 0.076 -- Cobalt D -- ug/I 0.027 J 0.53 1.3 2 0.31 J 0.17 0.1 J -- 1.8 Cobalt T 1 IMAC ug/I 0.037 J 0.57 1.3 1.5 0.25 J 0.42 0.1 J 0.57 -- Copper D -- ug/I 0.22 J 0.46 J+ 5 U 2 J+ 5 U 1.8 5 U -- 1.7 J+ Copper T 1000 02L ug/I 0.17 J 0.59 J+ 5 U 0.66 5 U 1.6 5 U 0.29 J -- Iron D -- ug/I 37 J 219 2340 93.5 51 69 190 -- 104 Iron T 300 02L ug/I 83.2 283 2410 80.5 J+ 82.3 1440 188 50 U -- Lead D -- ug/I 0.1U 0.1U 1U 0.1U 1U 0.1U 1U -- 0.14 Lead T 15 02L ug/I 0.1 U 0.11 1 U 0.1 U 1 U 0.58 1 U 0.1 U -- Magnesium T -- ug/I 11400 12500 17100 2800 17800 4160 8150 4780 -- Manganese D -- ug/I 5 U 357 854 371 28 17 331 -- 1530 Manganese T 50 02L ug/I 5 U 350 897 310 31.1 23.7 334 535 -- Mercury D -- ug/I 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U -- 0.2U Mercury T 1 02L ug/I 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U -- Methane N -- ug/I 1.5 J+ 10 U 10 U 10 U 3.1 J+ 1.5 J+ 114 10 U -- Molybdenum D -- ug/I 0.5 U 0.14 J 5 U 0.2 J 5 U 0.5 U 13.5 -- 0.21 J Molybdenum T -- ug/I 0.5 U 0.19 J 5 U 0.17 J 5 U 0.5 U 11.4 0.5 U -- Nickel D -- ug/I 0.62 5.8 5 U 13.7 5 U 2.6 5 U -- 4.8 Nickel T 100 02L ug/I 0.66 6.1 5 U 8 5 U 2.7 5 U 2.7 -- Nitrogen, NO2 plus NO3 N -- ug/I 460 240 20 U 310 100 1500 21 120 -- Potassium T -- ug/I 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U -- Selenium D -- ug/I 0.5 U 0.37 J 5 U 0.5 U 5 U 0.5 U 5 U -- 0.5 U Selenium T 20 02L ug/I 0.5 U 0.5 U 5 U 0.5 U 5 U 0.52 5 U 0.5 U -- Sodium T -- ug/I 17000 15600 16600 9530 9690 5720 21900 9530 -- Strontium D -- ug/I 200 333 475 168 560 91 1950 -- 103 Strontium T -- ug/I 206 360 495 175 601 93 1970 84.2 -- Sulfate N 250000 02L ug/I 33600 61200 40500 4700 J+ 19600 24900 106000 -- 21900 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U -- Thallium D -- ug/I 0.1U 0.1U 1U 0.1U 1U 0.1U 1U -- 0.1U Thallium T 0.2 IMAC ug/I 0.1 U 0.1 U 1 U 0.1 U 1 U 0.1 U 1 U 0.1 U -- Total Dissolved Solids N 500000 02L ug/I 165000 185000 257000 70000 260000 109000 354000 -- 101000 Total Organic Carbon N -- ug/I 1000 U -- -- -- 1000 U 1300 -- -- -- Total Suspended Solids N -- ug/I 2500 U 2800 4600 2500 U 2500 U 2500 U 2500 U 2500 U -- Uranium, Natural T -- ug/I 0.5 U 0.065 J 5 U 0.5 U 0.4 J 0.071 J 5 U 0.5 U -- Dan River Steam Station Page 5 of 14 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 026 SWOS Class B standards. 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 02B =North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 6 of 14 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: BG -5S 3/28/2016 N DR -BG -5S Round 5 GWA-10D 4/26/2016 N DR-GWA-10D Round 5 GWA-11D 4/26/2016 N DR-GWA-11D Round 5 GWA-11S 4/26!2016 N DR-GWA-11S Round 5 GWA-12D 3/28/2016 N DR-GWA-12D Round 5 GWA-12S 3/28/2016 N DR-GWA-12S Round 5 GWA-14D 4/25/2016 N DR-GWA-14D Round 5 GWA-14S 4/25/2016 N DR-GWA-14S Round 5 GWA-14S 4/26/2016 N DR-GWA-14S Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Vanadium D -- ug/I 0.13 J 0.16 J+ 3 U 0.29 J+ 4.9 0.23 J 3 U -- 0.67 J+ Vanadium T 0.3 IMAC ug/I 0.2 J 0.2 J+ 3 U 0.23 J 3.5 2.7 3 U 0.23 J+ -- Zinc D -- ug/I 10 U 38.4 3.6 J+ 47.5 J+ 3.4 J+ 5.3 J+ 10 U -- 6.5 J+ Zinc T 1000 02L ug/I 2.5 J 23.1 J+ 10 U 40.4 10 U 3.5 J 10 U 5.1 J -- Dissolved Oxygen N -- mg/I 1.36 1.7 0.3 2.8 0.5 3.13 -- -- -- Oxidation Reduction Potential N -- mV 167.9 144.6 -40.6 241.5 -20.6 213.1 -- -- -- pH N 6.5 - 8.5 02L SU 6.4 5.6 6.8 5.2 7.4 5.7 -- -- -- Specific Conductivity N -- NS/cm -- 296.7 487.1 110.3 -- -- -- -- -- Specific Conductivity N -- uS/cm 229.3 -- -- -- 360.5 103 -- -- -- Temperature N -- Deg C 15.3 26.7 20.1 21.9 19.6 19.5 -- -- -- Turbidity, field N -- NTU 2.07 5.1 1.8 3.5 0.82 42.2 -- -- -- 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 026 SWOS Class B standards. 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 02B =North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 6 of 14 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Dan River Steam Station Page 7 of 14 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: GWA-15D 4/25/2016 N DR-GWA-15D Round 5 GWA-1D 4/26/2016 N DR-GWA-1D Round 5 GWA-1S 4/25/2016 N DR-GWA-1S Round 5 GWA-4D 4/26/2016 N DR-GWA-4D Round 5 GWA-4S 4/26/2016 N DR-GWA-4S Round 5 GWA-5BR 4/26/2016 N DR-GWA-5BR Round 5 GWA-6D 4/25/2016 N DR-GWA-6D Round 5 GWA-6S 4/25/2016 N DR-GWA-6S Round 5 GWA-7D 4/25/2016 N DR-GWA-7D Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Alkalinity, CO3 N -- ug/I 5000 U 219000 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N -- ug/I 118000 5000 U 55800 41800 50400 165000 121000 248000 51200 Alkalinity, lab N -- ug/I 118000 378000 55800 41800 50400 165000 121000 248000 51200 Aluminum D -- ug/I 100 U 1020 100 U 100 U 100 U 100 U 100 U 100 U 100 U Aluminum T -- ug/I 100 U 1330 100 U 100 U 59.1 J 100 U 93.8 J 100 U 100 U Antimony D -- ug/I 5 U 1.2 J 0.5 U 0.5 U 0.5 U 5 U 0.5 U 5 U 0.5 U Antimony T 1 IMAC ug/I 5 U 1.4 J 0.5 U 0.5 U 0.5 U 5 U 0.5 U 5 U 0.5 U Arsenic D -- ug/I 1 U 2.7 0.098 J 0.081 J 0.19 1 U 0.56 1 U 0.09 J Arsenic T 10 02L ug/I 1 U 2.6 0.092 J 0.058 J 0.23 1 U 0.73 1 U 0.11 Barium D -- ug/I 41.6 64.8 4.9 J 16.7 49.5 59.9 49.4 125 17.7 Barium T 700 02L ug/I 43.5 69 5.3 16.6 52.5 60.5 61.9 126 18.6 Beryllium D -- ug/I 0.12 J 1 U 0.037 J+ 0.042 J 0.1 U 0.16 J 0.014 J 0.14 J 0.056 J Beryllium T 4 IMAC ug/I 0.21 J 1 U 0.029 J+ 0.1 U 0.013 J+ 1 U 0.062 J+ 0.18 J+ 0.062 J+ Boron D -- ug/I 46.2 J 50 U 50 U 240 174 183 467 631 50 U Boron T 700 02L ug/I 50.2 97.4 50 U 268 186 200 565 661 50 U Cadmium D -- ug/I 0.8 U 0.8 U 0.08 U 0.08 U 0.08 U 0.8 U 0.08 U 0.8 U 0.08 U Cadmium T 2 02L ug/I 0.8 U 0.8 U 0.08 U 0.08 U 0.08 U 0.8 U 0.08 U 0.8 U 0.08 U Calcium T -- ug/I 72000 14000 2960 15500 21200 184000 40100 69600 25200 Carbon N -- ug/I 1000 U 4600 730 J 1000 U 1000 U 1000 U 1300 3500 570 J Chloride N 250000 02L ug/I 10500 3600 2000 12100 7900 17600 18100 14900 3000 Chromium D -- ug/I 1.4 J 5 U 0.39 J+ 0.39 J+ 2 J+ 5 U 0.51 0.93 J 0.19 J Chromium T 10 02L ug/I 1.9 J+ 5 U 0.36 J+ 0.41 J+ 1.5 5 U 0.51 J+ 5 U 0.22 J+ Chromium 6+ T 0.07 DHHS ug/I 1.1 0.043 0.077 0.022 J 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U Cobalt D -- ug/I 1 U 1 U 0.39 0.15 J+ 2.4 1 U 0.2 1 U 2.8 Cobalt T 1 IMAC ug/I 1 U 1 U 0.31 0.082 J+ 2.4 1 U 0.26 1 U 3 Copper D -- ug/I 5 U 2.1 J 1.3 J+ 0.68 J+ 0.77 J+ 5 U 0.54 5 U 0.27 J Copper T 1000 02L ug/I 5 U 5 U 0.19 J 0.5 U 0.21 J+ 5 U 0.19 J+ 5 U 0.29 J+ Iron D -- ug/I 50 U 50 U 50 U 50 U 41.3 J 171 6900 9770 1700 Iron T 300 02L ug/I 50 U 50 U 44.4 J 50 U 79.2 201 10100 11500 1880 Lead D -- ug/I 1U 1U 0.1U 0.4 0.1U 1U 0.1U 1U 0.1U Lead T 15 02L ug/I 1U 1U 0.1U 0.1U 0.1U 1U 0.1U 1U 0.1U Magnesium T -- ug/I 15000 100 U 3760 6330 5560 24500 11000 9870 13000 Manganese D -- ug/I 24 5 U 47.1 32.6 456 692 1070 2340 863 Manganese T 50 02L ug/I 20.5 2.8 J 43.4 18 475 734 1490 2720 906 Mercury D -- ug/I 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 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 Methane N -- ug/I 10 U 16.4 10 U 68.1 10 U 19.6 6960 6590 10 U Molybdenum D -- ug/I 5 U 12.1 0.5 U 0.5 U 14.9 5 U 3.5 4.7 J 0.5 U Molybdenum T -- ug/I 5 U 14.3 0.5 U 0.5 U 15.7 5 U 4 4.1 J 0.5 U Nickel D -- ug/I 5 U 5 U 1.6 0.76 4.3 5 U 1.6 5 U 1.3 Nickel T 100 02L ug/I 5 U 5 U 1.6 0.77 2.5 5 U 1.8 5 U 1.3 Nitrogen, NO2 plus NO3 N -- ug/I 36 20 U 30 20 U 20 U 20 U 20 U 20 U 20 U Potassium T -- ug/I 4310 J 209000 5000 U 5000 U 4130 J 5000 U 5000 U 8030 5000 U Selenium D -- ug/I 5U 5U 0.5U 0.5U 0.5U 5U 0.5U 5U 0.5U Selenium T 20 02L ug/I 5 U 5 U 0.5 U 0.5 U 0.5 U 5 U 0.5 U 5 U 0.5 U Sodium T -- ug/I 17000 63000 16500 18100 14100 19800 27000 23200 22300 Strontium D -- ug/I 1450 455 52.7 231 304 1870 171 608 270 Strontium T -- ug/I 1600 521 54 234 322 1900 183 536 282 Sulfate N 250000 02L ug/I 148000 20000 3200 42500 47000 419000 61000 10400 106000 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 UJ 100 U 100 U 100 U 100 U Thallium D -- ug/I 1U 1U 0.1U 0.1U 0.1U 1U 0.1U 1U 0.1U Thallium T 0.2 IMAC ug/I 1 U 1 U 0.1 U 0.1 U 0.1 U 1 U 0.1 U 1 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 357000 522000 81000 132000 155000 796000 261000 304000 256000 Total Organic Carbon N -- ug/I -- -- -- -- -- -- -- -- -- Total Suspended Solids N -- ug/I 2500 U 5000 U 2500 U 2500 U 2500 U 2500 U 7600 20600 2500 U Uranium, Natural T -- ug/I 5 U 5 U 0.5 U 0.5 U 0.5 U 5 U 0.5 U 5 U -- Dan River Steam Station Page 7 of 14 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 026 SWOS Class B standards. 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 02B =North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 8 of 14 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: GWA-15D 4/25/2016 N DR-GWA-15D Round 5 GWA-1D 4/26/2016 N DR-GWA-1D Round 5 GWA-1S 4/25/2016 N DR-GWA-1S Round 5 GWA-4D 4/26/2016 N DR-GWA-4D Round 5 GWA-4S 4/26/2016 N DR-GWA-4S Round 5 GWA-5BR 4/26/2016 N DR-GWA-5BR Round 5 GWA-6D 4/25/2016 N DR-GWA-6D Round 5 GWA-6S 4/25/2016 N DR-GWA-6S Round 5 GWA-7D 4/25/2016 N DR-GWA-7D Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Vanadium D -- ug/I 3 U 3.6 0.36 J+ 0.2 J+ 0.12 J+ 0.71 J+ 0.24 J 3 U 0.3 U Vanadium T 0.3 IMAC ug/I 3 U 3.5 0.17 J 0.18 J+ 0.25 J+ 3 U 0.32 3 U 0.3 U Zinc D -- ug/I 3.2J 10U 8.4J 10U 10U 10U 4.1 J+ 10U 4.8 J+ Zinc T 1000 02L ug/I 10U 10U 4.3J 10U 10U 10U 4.3J 2.5J 4.6J Dissolved Oxygen N -- mg/I -- 0.4 0.7 0.4 0.2 0.2 0.2 0.2 0.3 Oxidation Reduction Potential N -- mV -- -124.2 179.4 17.8 99.2 -40.4 -68.1 -112.9 25.8 pH N 6.5 - 8.5 02L SU -- 12.2 5.6 6.2 6.5 7.2 6.5 6.9 6.2 Specific Conductivity N -- NS/cm -- 1760 114.1 222.9 236.9 1054 443.8 567 348 Specific Conductivity N -- uS/cm -- -- -- -- -- -- -- -- -- Temperature N -- Deg C -- 16 18.4 19.4 20.5 19.9 22.8 19.4 19.8 Turbidity, field N -- NTU -- 5.2 6.4 1.1 3.2 3.9 4.3 4.1 6.5 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 026 SWOS Class B standards. 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 02B =North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 8 of 14 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Dan River Steam Station Page 9 of 14 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: GWA-7S 4/25/2016 N DR-GWA-7S Round 5 GWA-8D 4/25/2016 N DR-GWA-8D Round 5 GWA-8S 4/25/2016 N DR-GWA-8S Round 5 GWA-9D 3/28/2016 N DR-GWA-9D Round 5 GWA-9S 3/28/2016 N DR-GWA-9S Round 5 MW -10D 4/26/2016 N DR -MW -10D Round 5 MW -11 4/26/2016 N DR -MW -11 Round 5 MW -11D 4/25/2016 N DR -MW -11D Round 5 MW -12 4/25/2016 N DR -MW -12 Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Alkalinity, CO3 N -- ug/I 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U -- 5000 U 5000 U Alkalinity, HCO3 N -- ug/I 1300 J 142000 75300 24700 12300 93600 -- 120000 8600 Alkalinity, lab N -- ug/I 1300 J 142000 75300 24700 12300 93600 -- 120000 8600 Aluminum D -- ug/I 509 100 U 87.1 J 100 U 100 U 100 U 256 100 U 100 U Aluminum T -- ug/I 559 100 U 489 100 U 96.9 J 100 U 494 61.7 J 100 U Antimony D -- ug/I 0.5 U 5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 5 U 0.5 U Antimony T 1 IMAC ug/I 0.5 U 5 U 0.12 J 0.5 U 0.5 U 0.5 U 0.5 U 5 U 0.5 U Arsenic D -- ug/I 0.099 J 2 0.24 0.57 0.1 U 0.065 J 0.07 J 1 U 0.067 J Arsenic T 10 02L ug/I 0.12 2.2 0.33 0.56 0.1 U 0.074 J 0.24 1 U 0.14 Barium D -- ug/I 37.5 28.4 25 12 8.1 42.4 66.9 55.8 5.6 Barium T 700 02L ug/I 38.3 30.4 28.4 13 8.7 44.1 80.2 53.4 5.8 Beryllium D -- ug/I 8.2 0.17 J 0.059 J+ 0.07 J 0.088 J 0.079 J 0.49 0.27 J 0.24 Beryllium T 4 IMAC ug/I 7.7 0.33 J 0.092 J+ 0.039 J 0.098 J 0.1 U 0.44 1 U 0.16 Boron D -- ug/I 50 U 50 U 50 U 50 U 50 U 423 216 91.7 50 U Boron T 700 02L ug/I 50 U 50 U 50 U 50 U 50 U 461 234 102 50 U Cadmium D -- ug/I 0.53 0.8 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.8 U 0.057 J Cadmium T 2 02L ug/I 0.51 0.8 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.8 U 0.051 J Calcium T -- ug/I 37400 125000 27200 6790 1050 33800 3450 65100 1210 Carbon N -- ug/I 840 J 890 J 1100 -- -- 1000 U -- 1000 U 1000 U Chloride N 250000 02L ug/I 2200 3900 5700 3100 4300 22300 -- 24900 4900 Chromium D -- ug/I 0.75 5 U 0.69 0.18 J 0.38 J 0.32 J+ 1.1 J+ 1.1 J+ 0.23 J+ Chromium T 10 02L ug/I 0.91 J+ 5 U 1.1 J+ 0.27 J+ 0.33 J+ 0.34 J+ 5.4 J+ 2.2 J 0.27 J+ Chromium 6+ T 0.07 DHHS ug/I 0.44 J- 0.03 U 0.26 0.03 U 0.077 0.03 U -- 1.2 0.051 Cobalt D -- ug/I 20.6 0.11 J 0.24 0.86 3.2 0.59 32.4 1 U 10.2 Cobalt T 1 IMAC ug/I 18.6 0.1 J 0.24 0.84 3.3 0.52 34.1 1 U 10.8 Copper D -- ug/I 4.3 5 U 1.3 1.5 3.3 0.75 J+ 4.5 1.7 J+ 7.3 Copper T 1000 02L ug/I 1.1 J+ 5 U 1.1 0.5 U 0.89 0.16 J 3.7 1.3 J+ 3.6 Iron D -- ug/I 50 U 96.6 30.2 J 1900 50 U 126 211 50 U 105 Iron T 300 02L ug/I 139 143 502 2120 111 130 864 41.2 J 361 Lead D -- ug/I 0.11 1 U 0.1 U 0.1 U 0.1 U 0.28 0.31 1 U 0.38 Lead T 15 02L ug/I 0.15 1 U 0.24 0.1 U 0.09 J 0.1 U 1.6 1 U 1.5 Magnesium T -- ug/I 23200 31300 20000 1980 537 10600 1950 7990 2840 Manganese D -- ug/I 970 1080 82.3 480 71 915 888 144 258 Manganese T 50 02L ug/I 862 1120 55.7 520 76.3 1000 966 152 276 Mercury D -- ug/I 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 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 Methane N -- ug/I 10 U 10 U 10 U 1.7 J+ 1.5 J+ 10 U -- 10 U 10 U Molybdenum D -- ug/I 0.5 U 7 0.14 J 0.12 J 0.5 U 0.12 J 0.5 U 7.3 0.5 U Molybdenum T -- ug/I 0.5 U 6.6 0.12 J 0.12 J 0.5 U 0.11 J 0.36 J 5.1 0.5 U Nickel D -- ug/I 67.5 5 U 5.5 2.6 3.1 1.8 8.1 5 U 7.9 Nickel T 100 02L ug/I 63.2 5 U 5.1 2 2.2 1.8 J+ 8.4 J+ 5 U 8.2 Nitrogen, NO2 plus NO3 N -- ug/I 1200 20 U 26 20 U 50 20 U -- 200 20 U Potassium T -- ug/I 5000 U 5000 U 5000 U 5000 U 3250 J 5000 U 5000 U 3910 J 5000 U Selenium D -- ug/I 1.3 5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 5 U 0.5 U Selenium T 20 02L ug/I 1.4 5 U 0.47 J 0.5 U 0.5 U 0.5 U 0.99 5 U 0.5 U Sodium T -- ug/I 15400 53800 55100 4890) 7150 17300 18600 14200 5140 Strontium D -- ug/I 987 669 275 27 24 271 57.9 469 4.7 J Strontium T -- ug/I 951 710 306 28.1 23.9 292 62.7 519 4.7 J Sulfate N 250000 02L ug/I 210000 388000 176000 7100 4100 41500 -- 76800 8400 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U -- 100 U 100 U Thallium D -- ug/I 0.1U 1U 0.1U 0.1U 0.1U 0.1U 0.1U 1U 0.1U Thallium T 0.2 IMAC ug/I 0.1 U 1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.018 J 1 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 361000 721000 366000 81000 70000 195000 -- 283000 41000 Total Organic Carbon N -- ug/I -- -- -- 1000 U 1000 U -- -- -- -- Total Suspended Solids N -- ug/I 2500 U 2500 U 9400 2500 U 2800 2500 U -- 2700 2500 U Uranium, Natural T -- ug/I -- -- -- 0.5 U 0.5 U -- -- -- -- Dan River Steam Station Page 9 of 14 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 026 SWOS Class B standards. 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 02B =North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 10 of 14 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: GWA-7S 4/25/2016 N DR-GWA-7S Round 5 GWA-8D 4/25/2016 N DR-GWA-8D Round 5 GWA-8S 4/25/2016 N DR-GWA-8S Round 5 GWA-9D 3/28/2016 N DR-GWA-9D Round 5 GWA-9S 3/28/2016 N DR-GWA-9S Round 5 MW -10D 4/26/2016 N DR -MW -10D Round 5 MW -11 4/26/2016 N DR -MW -11 Round 5 MW -11D 4/25/2016 N DR -MW -11D Round 5 MW -12 4/25/2016 N DR -MW -12 Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Vanadium D -- ug/I 0.097 J 1 J 0.64 0.3 U 0.3 U 0.15 J 0.79 J+ 3 U 0.092 J+ Vanadium T 0.3 IMAC ug/I 0.2 J 3 U 1.2 0.3 U 0.1 J 0.19 J+ 5.3 0.77 J 0.11 J Zinc D -- ug/I 443 3.2 J+ 5.7 J+ 6.1 J+ 37 3.5 J+ 13 J+ 2.6 J 49 Zinc T 1000 02L ug/I 389 2.9 J 6.8 J 5.2 J 32.2 2.7 J+ 12.1 J+ 7.2 J 39.2 Dissolved Oxygen N -- mg/I 2 -- -- 0.4 3.84 0.4 6.2 2.4 1.2 Oxidation Reduction Potential N -- mV 370.1 -- -- 37 149.8 101.5 352.6 60.7 287.5 pH N 6.5 - 8.5 02L SU 4.7 -- -- 6 5.7 6.2 4.8 7.7 5.3 Specific Conductivity N -- NS/cm 525.6 -- -- -- -- 338.6 151.4 458.7 61.6 Specific Conductivity N -- uS/cm -- -- -- 76.1 47.2 -- -- -- -- Temperature N -- Deg C 21.3 -- -- 15.2 16 21.8 20.7 19.8 20.1 Turbidity, field N -- NTU 8.3 -- -- 4.19 6.14 0.01 7.97 1.2 8.5 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 026 SWOS Class B standards. 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 02B =North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 10 of 14 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Dan River Steam Station Page 11 of 14 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: MW -12D 4/25/2016 N DR -MW -12D Round 5 MW -226R 4/25/2016 N DR-MW-22BR Round 5 MW-23BR 3/29/2016 N DR-MW-23BR Round 5 MW-23BR 3/29!2016 FD R-MW-23BR-FD-MRM Round 5 MW -23D 3/29/2016 N DR -MW -23D Round 5 MW-308BR 4/25/2016 N DR -MW -3086R Round 5 MW-310BR 4/26/2016 N DR-MW-310BR Round 5 MW-311BR 4/26/2016 N DR-MW-311BR Round 5 MW-314BR 4/26/2016 N DR-MW-314BR Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Alkalinity, CO3 N -- ug/I 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N -- ug/I 75000 114000 217000 219000 23100 114000 159000 192000 84800 Alkalinity, lab N -- ug/I 75000 114000 217000 219000 23100 114000 159000 192000 84800 Aluminum D -- ug/I 100 U 100 U 100 U 100 U 68 J 100 U 100 U 100 U 50 J Aluminum T -- ug/I 100 U 100 U 100 U 100 U 579 100 U 100 U 210 85.6 J Antimony D -- ug/I 0.5 U 0.4 J 5 U 5 U 0.5 U 5 U 0.5 U 5 U 0.5 U Antimony T 1 IMAC ug/I 0.5 U 0.46 J 5 U 5 U 0.5 U 5 U 0.5 U 5 U 0.18 J Arsenic D -- ug/I 0.15 0.2 0.54 J 0.44 J 0.059 J 0.47 J 0.7 1 U 0.62 Arsenic T 10 02L ug/I 0.15 0.26 0.47 J+ 0.48 J+ 0.25 J+ 0.48 J 0.1 U 0.52 J 1.6 Barium D -- ug/I 13.9 27.8 110 110 17 54.8 79.8 101 19.8 Barium T 700 02L ug/I 14.5 29.3 110 113 21.7 56.7 76.3 134 25.7 Beryllium D -- ug/I 0.015 J 0.011 J+ 1 U 1 U 0.03 J 0.38 J 0.031 J 1 U 0.014 J Beryllium T 4 IMAC ug/I 0.1 U 0.1 U 1 U 1 U 0.074 J+ 0.32 J 0.1 U 0.14 J 0.012 J+ Boron D -- ug/I 50 U 494 50 U 50 U 50 U 374 50 U 677 414 Boron T 700 02L ug/I 50 U 526 50 U 25.4 J 50 U 391 50 U 735 424 Cadmium D -- ug/I 0.08 U 0.08 U 0.8 U 0.8 U 0.08 U 0.8 U 0.08 U 0.8 U 0.08 U Cadmium T 2 02L ug/I 0.08 U 0.08 U 0.8 U 0.8 U 0.084 J+ 0.8 U 0.08 U 0.8 U 0.08 U Calcium T -- ug/I 13800 100 U 57100 57400 11900 54500 42700 60100 48200 Carbon N -- ug/I 1000 U 2400 -- -- -- 1000 U 12300 990 J 780 J Chloride N 250000 02L ug/I 9800 18800 4200 4200 2700 13700 15200 23700 27900 Chromium D -- ug/I 2.1 J+ 0.31 J+ 5 U 5 U 0.42 J+ 5 U 0.17 J+ 0.96 J+ 0.13 J+ Chromium T 10 02L ug/I 3.2 0.4 J+ 5 U 1.1 J+ 1.3 J+ 5 U 0.23 J+ 4.9 J 1.3 Chromium 6+ T 0.07 DHHS ug/I 0.47 0.03 U 0.03 U 0.03 U 0.094 0.03 U 0.03 U 0.011 J 0.068 Cobalt D -- ug/I 2.4 0.076 J 0.2 J 1 U 0.049 J 15.4 0.052 J 0.13 J+ 0.1 Cobalt T 1 IMAC ug/I 2.3 0.06 J 1 U 1 U 0.28 J+ 16 0.1 U 0.31 J+ 0.14 Copper D -- ug/I 0.61 J+ 0.19 J+ 2.4 J 2.6 J 1.1 J+ 5 U 0.13 J+ 5 U 0.14 J Copper T 1000 02L ug/I 0.41 J+ 0.14 J 5 U 5 U 0.93 J+ 5.5 0.19 J 2.4 J 0.22 J Iron D -- ug/I 1530 142 890 850 45 J 7660 50 U 337 102 Iron T 300 02L ug/I 1430 168 1130 1150 850 7930 25.7 J 726 165 Lead D -- ug/I 0.1U 0.1U 1U 1U 0.1U 1U 0.1U 1U 0.1U Lead T 15 02L ug/I 0.1 U 0.1 U 1 U 1 U 0.35 J+ 1 U 0.1 U 1 U 0.1 U Magnesium T -- ug/I 8350 100 U 20100 20300 3920 9760 11400 12200 12700 Manganese D -- ug/I 663 232 25 24 5 U 7290 143 423 122 Manganese T 50 02L ug/I 685 242 25 26 10.2 7460 101 611 157 Mercury D -- ug/I 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 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 Methane N -- ug/I 10 U 202 41.3 25.5 1.6 J+ 24.9 J- 10 U 10 U 1230 Molybdenum D -- ug/I 0.15 J 12.2 1.3 J 1.2 J 0.5 U 5 U 0.55 1.2 J 0.69 Molybdenum T -- ug/I 0.47 J 10.9 1.3 J 1.3 J 0.14 J+ 5 U 0.5 U 1.5 J 2 Nickel D -- ug/I 2.7 J+ 2.2 J+ 5 U 5 U 0.88 13.4 0.5 U 5 U 0.68 Nickel T 100 02L ug/I 2.7 1.3 5 U 5 U 0.9 12 0.5 U 5 U 0.86 Nitrogen, NO2 plus NO3 N -- ug/I 20 U 20 U 20 U 20 U 20 U 20 U 20 U 20 U 20 U Potassium T -- ug/I 10800 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 38800 6190 Selenium D -- ug/I 0.5U 0.5U 5U 5U 0.5U 5U 0.5U 5U 0.5U Selenium T 20 02L ug/I 0.5 U 0.5 U 5 U 5 U 0.38 J 5 U 0.5 U 5 U 0.5 U Sodium T -- ug/I 16400 5000 U 13900 13800 2880 J 4520 J 12400 25000 13400 Strontium D -- ug/I 52.8 479 1700 1700 65 1740 282 795 151 Strontium T -- ug/I 56.5 502 1710 1750 70.9 1790 296 1050 174 Sulfate N 250000 02L ug/I 29000 42100 11300 11200 20300 811000 5800 46900 80000 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 140 Thallium D -- ug/I 0.1U 0.1U 1U 1U 0.1U 1U 0.1U 1U 0.1U Thallium T 0.2 IMAC ug/I 0.1 U 0.1 U 1 U 1 U 0.1 U 1 U 0.1 U 1 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 146000 226000 245000 250000 82000 1400000 192000 287000 247000 Total Organic Carbon N -- ug/I -- -- 1000 U 1000 U 1100 -- -- -- -- Total Suspended Solids N -- ug/I 5000 U 2500 U 2600 U 2500 U 2500 U 7400 8600 321000 2500 U Uranium, Natural T -- ug/I -- -- 5 U 0.61 J 0.5 U -- 1 -- 1 Dan River Steam Station Page 11 of 14 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 026 SWOS Class B standards. 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 02B =North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 12 of 14 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: MW -12D 4/25/2016 N DR -MW -12D Round 5 MW -226R 4/25/2016 N DR-MW-22BR Round 5 MW-23BR 3/29/2016 N DR-MW-23BR Round 5 MW-23BR 3/29!2016 FD R-MW-23BR-FD-MRM Round 5 MW -23D 3/29/2016 N DR -MW -23D Round 5 MW-308BR 4/25/2016 N DR -MW -3086R Round 5 MW-310BR 4/26/2016 N DR-MW-310BR Round 5 MW-311BR 4/26/2016 N DR-MW-311BR Round 5 MW-314BR 4/26/2016 N DR-MW-314BR Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Vanadium D -- ug/I 0.18 J+ 0.21 J+ 3 U 3 U 0.13 J 3 U 0.21 J 3 U 0.14 J+ Vanadium T 0.3 IMAC ug/I 0.2 J 0.17 J 3 U 3 U 1.1 3 U 0.096 J+ 1.1 J 0.49 Zinc D -- ug/I 9.6 J 10 U 3.1 J+ 2.7 J+ 3.4 J+ 4 J+ 10 U 3.6 J+ 2.6 J+ Zinc T 1000 02L ug/I 3.8 J 10 U 10 U 10 U 10 U 10 U 2.7 J+ 11.2 30.1 Dissolved Oxygen N -- mg/I 2 -- 2.21 2.21 6.4 0.49 0.2 0.1 0.4 Oxidation Reduction Potential N -- mV 60.6 -- -113.8 -113.8 162.5 -92.4 -85.5 -101.5 -31 pH N 6.5 - 8.5 02L SU 6.5 -- 7.4 7.4 6 6.9 7.9 7.2 9.3 Specific Conductivity N -- NS/cm 259 -- -- 442.1 -- 1112 344 494.9 331 Specific Conductivity N -- uS/cm -- -- 442.1 -- 108.2 -- -- -- -- Temperature N -- Deg C 20.3 -- 16 16 13.6 22.9 23.8 19.3 25.9 Turbidity, field N -- NTU 5 -- 0.01 0.01 20.08 2.12 3.64 28.4 6.4 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 026 SWOS Class B standards. 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 02B =North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 12 of 14 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Dan River Steam Station Page 13 of 14 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: MW-315BR 4/26/2016 N DR-MW-315BR Round 5 MW -3176R 4/26/2016 N DR-MW-317BR Round 5 MW-317BR 4/26/2016 FD DR-MW-317BR-FD Round 5 MW -318D 4/26/2016 N DR -MW -318D Round 5 MW -9D 4/26/2016 N DR -MW -9D Round 5 OW -308D 4/26/2016 N DR -OW -308D Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Alkalinity, CO3 N -- ug/I 5000 U 192000 J 115000 J 5000 U 5000 U 5000 U Alkalinity, HCO3 N -- ug/I 158000 96800 118000 55200 27800 42200 Alkalinity, lab N -- ug/I 158000 289000 J 233000 J 55200 27800 42200 Aluminum D -- ug/I 100 U 1180 1130 100 U 88.6 J 100 U Aluminum T -- ug/I 95 J 1310 1360 60.4 J 376 140 Antimony D -- ug/I 5 U 1.7 J 1.8 J 0.13 J 0.5 U 0.5 U Antimony T 1 IMAC ug/I 5 U 2.3 J 1.7 J 0.5 U 0.5 U 0.5 U Arsenic D -- ug/I 1 U 0.76 J 0.47 J 1.4 0.1 U 282 Arsenic T 10 02L ug/I 1 U 0.7 J 0.58 J 1.1 0.062 J 319 Barium D -- ug/I 73 49.1 48.8 34.3 5.7 21.8 Barium T 700 02L ug/I 64.7 65.8 57.8 37.9 8.6 23.7 Beryllium D -- ug/I 0.2 J 1 U 1 U 0.46 0.014 J 0.044 J+ Beryllium T 4 IMAC ug/I 1 U 1 U 0.26 J+ 0.45 0.081 J 0.013 J+ Boron D -- ug/I 25.4 J 50 U 50 U 1430 956 319 Boron T 700 02L ug/I 51.8 50 U 50 U 1640 1030 355 Cadmium D -- ug/I 0.8 U 0.8 U 0.8 U 0.08 U 0.055 J 0.08 U Cadmium T 2 02L ug/I 0.8 U 0.8 U 0.8 U 0.091 0.51 0.08 U Calcium T -- ug/I 57200 78600 75000 22600 22500 25500 Carbon N -- ug/I 1000 U 1000 1000 1000 U 1000 U 920 J Chloride N 250000 02L ug/I 3100 5600 5100 8100 18600 9200 Chromium D -- ug/I 5 U 9.2 9.8 0.81 J+ 0.36 J+ 0.4 J+ Chromium T 10 02L ug/I 1.7 J 10.4 8.3 0.41 J+ 2.3 J+ 0.89 J+ Chromium 6+ T 0.07 DHHS ug/I 0.03 U 12.6 11.9 0.03 U 0.03 U 0.15 U Cobalt D -- ug/I 0.19 J 0.14 J 0.14 J 3.1 0.28 0.081 J Cobalt T 1 IMAC ug/I 0.22 J 0.33 J 0.22 J 1.9 0.7 0.085 J Copper D -- ug/I 5 U 1.8 J+ 1.5 J+ 0.42 J+ 0.75 0.72 J+ Copper T 1000 02L ug/I 5 U 2.2 J 1.8 J 0.36 J 2.8 0.3 J Iron D -- ug/I 73.4 50 U 50 U 308 46.7 J 28700 Iron T 300 02L ug/I 130 46.8 J 49.8 J 239 403 31400 Lead D -- ug/I 1 U 1 U 1 U 0.091 J 0.1 U 0.1 U Lead T 15 02L ug/I 1 U 1 U 1 U 0.16 0.65 0.1 U Magnesium T -- ug/I 9630 407 676 12500 8970 10300 Manganese D -- ug/I 794 4.1 J 4.3 J 166 452 416 Manganese T 50 02L ug/I 526 6.8 15.2 129 489 448 Mercury D -- ug/I 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 Methane N -- ug/I 10 U 10 U 10 U 10 U 11.2 32.5 Molybdenum D -- ug/I 5 U 5.8 5.6 0.5 U 7.7 2.3 Molybdenum T -- ug/I 5 U 5.6 4.8 J 0.5 U 8.2 2.6 Nickel D -- ug/I 5 U 5 U 5 U 12.2 2.9 1.2 Nickel T 100 02L ug/I 5 U 5 U 5 U 9.7 3.6 J+ 0.84 Nitrogen, NO2 plus NO3 N -- ug/I 20 U 20 U 20 U 20 U 20 U 20 U Potassium T -- ug/I 5000 U 39600 J 30600 J 5000 U 5000 U 7650 Selenium D -- ug/I 5 U 5 U 5 U 0.79 0.5 U 0.5 U Selenium T 20 02L ug/I 5 U 5 U 5 U 1 0.5 U 0.5 U Sodium T -- ug/I 12900 34000 29100 30400 26200 16000 Strontium D -- ug/I 508 419 418 615 110 403 Strontium T -- ug/I 484 600 505 692 115 442 Sulfate N 250000 02L ug/I 44900 12100 10800 103000 97600 108000 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 1 U 1 U 1 U 0.1 U 0.1 U 0.028 J Thallium T 0.2 IMAC ug/I 1 U 1 U 1 U 0.1 U 0.1 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 248000 307000 263000 252000 204000 240000 Total Organic Carbon N -- ug/I -- -- -- -- -- -- Total Suspended Solids N -- ug/I 6200 8900 14500 4300 12000 18500 Uranium, Natural T -- ug/I 5 U -- -- -- -- -- Dan River Steam Station Page 13 of 14 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 026 SWOS Class B standards. 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 02B =North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 14 of 14 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: MW-315BR 4/26/2016 N DR-MW-315BR Round 5 MW -3176R 4/26/2016 N DR-MW-317BR Round 5 MW-317BR 4/26/2016 FD DR-MW-317BR-FD Round 5 MW -318D 4/26/2016 N DR -MW -318D Round 5 MW -9D 4/26/2016 N DR -MW -9D Round 5 OW -308D 4/26/2016 N DR -OW -308D Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Vanadium D -- ug/I 0.72 J+ 6.7 6.7 0.2 J+ 0.34 J+ 0.3 UJ Vanadium T 0.3 IMAC ug/I 3 U 6.6 4.9 0.087 J 2.3 0.32 Zinc D -- ug/I 8.2 J+ 10 U 10 U 20.8 J+ 10 U 2.6 J+ Zinc T 1000 02L ug/I 9.3 J 10 U 6.6 J+ 14.7 J+ 10 U 2.6 J+ Dissolved Oxygen N -- mg/I 0.5 3.02 3.02 1.61 0.1 0.19 Oxidation Reduction Potential N -- mV -11.2 29.1 29.1 165.2 130.8 -72 pH N 6.5 - 8.5 02L SU 7.2 10.3 10.3 5.2 6.5 6.3 Specific Conductivity N -- NS/cm 348.5 1452 1452 353.1 328 401.7 Specific Conductivity N -- uS/cm -- -- -- -- -- -- Temperature N -- Deg C 23 23.4 23.4 26.2 18.5 27.2 Turbidity, field N -- NTU 8.7 4.62 4.62 2.94 30.5 6.02 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 026 SWOS Class B standards. 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 02B =North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 14 of 14 CSA Supplement 2 Table 3-2: Round 5 Analytical Results of Porewater Monitoring Dan River Steam Station Page 1 of 3 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: AB -10S 4/25/2016 N DR -AB -10S Round 5 AB-10SL 4/25/2016 N DR-AB-10SL Round 5 AB -25S 4/25/2016 N DR -AB -25S Round 5 AB -5S 4/25/2016 N DR -AB -5S Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Alkalinity, CO3 N -- ug/I 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N -- ug/I 112000 166000 107000 60200 Alkalinity, lab N -- ug/I 112000 166000 107000 60200 Aluminum D -- ug/I 100 U 100 U 56.1 J 94.7 J Aluminum T -- ug/I 60.7 J 188 240 81.7 J Antimony D -- ug/I 0.21 J 0.48 J 4.4 5 U Antimony T 1 IMAC ug/I 0.44 J 0.51 4.3 5 U Arsenic D -- ug/I 231 4.4 257 144 Arsenic T 10 02L ug/I 249 4.7 243 172 Barium D -- ug/I 181 123 93.1 71 Barium T 700 02L ug/I 191 123 102 74.2 Beryllium D -- ug/I 0.11 J+ 0.022 J 0.1 U 0.18 J Beryllium T 4 IMAC ug/I 0.13 0.012 J+ 0.1 U 1 U Boron D -- ug/I 311 451 554 325 Boron T 700 02L ug/I 322 476 610 345 Cadmium D -- ug/I 0.08 U 0.08 U 0.08 U 0.8 U Cadmium T 2 02L ug/I 0.08 U 0.08 U 0.08 U 0.8 U Calcium T -- ug/I 29300 23600 39100 51200 Carbon N -- ug/I 540 J 1200 1000 U 1000 U Chloride N 250000 02L ug/I 13100 20000 15200 9900 Chromium D -- ug/I 0.99 1.1 J+ 0.29 J+ 5 U Chromium T 10 02L ug/I 0.65 J+ 4.7 0.89 J+ 5 U Chromium 6+ T 0.07 DHHS ug/I 0.03 U 0.54 0.014 J 0.03 U Cobalt D -- ug/I 13.5 0.47 0.051 J 32.5 Cobalt T 1 IMAC ug/I 13.5 0.54 0.2 31.2 Copper D -- ug/I 0.29 J 0.94 0.48 J 5 U Copper T 1000 02L ug/I 0.41 J 1.4 0.41 J 5 U Iron D -- ug/I 11500 50 U 50 U 35500 Iron T 300 02L ug/I 13200 153 275 37500 Lead D -- ug/I 0.1 U 0.1 U 0.1 U 1 U Lead T 15 02L ug/I 0.1 U 0.14 0.11 1 U Magnesium T -- ug/I 6840 8320 6900 11000 Manganese D -- ug/I 927 371 18.3 1330 Manganese T 50 02L ug/I 1020 371 26.3 1400 Dan River Steam Station Page 1 of 3 CSA Supplement 2 Table 3-2: Round 5 Analytical Results of Porewater Monitoring Dan River Steam Station Page 2 of 3 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: AB -10S 4/25/2016 N DR -AB -10S Round 5 AB-10SL 4/25/2016 N DR-AB-10SL Round 5 AB -25S 4/25/2016 N DR -AB -25S Round 5 AB -5S 4/25/2016 N DR -AB -5S Round 5 Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Mercury D -- ug/I 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 Methane N -- ug/I 14.3 27.8 21.9 13.4 Molybdenum D -- ug/I 13.2 30.6 41.3 19.8 Molybdenum T -- ug/I 10.8 31.9 41.2 18.1 Nickel D -- ug/I 7.8 5.1 1.2 28.2 Nickel T 100 02L ug/I 6.5 5.8 1.5 25.7 Nitrogen, NO2 plus NO3 N -- ug/I 20 U 240 42 20 UJ Potassium T -- ug/I 6610 25600 7210 14400 Selenium D -- ug/I 0.5 U 0.36 J 22.5 5 U Selenium T 20 02L ug/I 0.56 0.34 J 21.6 5 U Sodium T -- ug/I 18700 49700 29500 15300 Strontium D -- ug/I 762 373 886 1150 Strontium T -- ug/I 789 387 963 1220 Sulfate N 250000 02L ug/I 28300 37900 68700 152000 Sulfide N -- ug/I 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.31 0.071 J 0.31 0.72 J Thallium T 0.2 IMAC ug/I 0.3 0.068 J 0.32 0.66 J Total Dissolved Solids N 500000 02L ug/I 209000 254000 229000 352000 Total Suspended Solids N -- ug/I 5900 7400 8500 32000 Uranium, Natural T -- ug/I -- -- 11.4 -- Vanadium D -- ug/I 0.98 3.6 54.5 3 U Vanadium T 0.3 IMAC ug/I 2.2 4.4 55.9 0.71 J Zinc D -- ug/I 4.8 J 10 U 10 U 14.5 Zinc T 1000 02L ug/I 4.7 J 10 U 10 U 14.3 Dissolved Oxygen N -- mg/I 0.4 0.7 0.2 0.5 Oxidation Reduction Potential N -- mV -23.4 29 85.4 -27.6 pH N 6.5 - 8.5 02L SU 6.3 8.4 8.2 6.5 Specific Conductivity N -- NS/cm 357.3 504 408.8 600 Temperature N -- Deg C 25.3 29.4 21.3 20.3 Turbidity, field N -- NTU 9.7 9.5 5.8 9.8 Dan River Steam Station Page 2 of 3 CSA Supplement 2 Table 3-2: Round 5 Analytical Results of Porewater Monitoring Location: AB -10S AB-10SL AB -25S AB -5S Date: 4/25/2016 4/25/2016 4/25/2016 4/25/2016 Sample Type: N N N N Sample Name: DR -AB -10S DR-AB-10SL DR -AB -25S DR -AB -5S Event: Round 5 Round 5 Round 5 Round 5 NCDEQ 02L GWQS, Constituent Fraction GWQS Source Unit IMAC, or DHHS 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 026 SWQS Class B standards. Notes: Nm =micron ug/L =micrograms per liter NS/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 02B =North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 3 of 3 CSA Supplement 2 Table 3-3: Round 5 Analytical Results of Surface Water Locations Dan River Steam Station Page 1 of 4 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: SW -1 4/25/2016 N DR -SW -1 Round 5 SW -10 4/25/2016 N DR -SW -10 Round 5 SW -11 4/25/2016 N DR -SW -11 Round 5 SW -12 4/25/2016 N DR -SW -12 Round 5 SW -13 4/25/2016 N DR -SW -13 Round 5 SW -3 4/25/2016 N DR -SW -3 Round 5 SW -4 4/25/2016 N DR -SW -4 Round 5 SW -5 4/25/2016 N DR -SW -5 Round 5 Constituent Fraction NCDEQ 02B SWQS (Class C) Unit Alkalinity, CO3 N -- ug/I 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N -- ug/I 54000 39100 39700 40300 38400 38900 39600 50600 Alkalinity, lab N -- ug/I 54000 39100 39700 40300 38400 38900 39600 50600 Aluminum D -- ug/I 100 U 100 U 100 U 58.3 J 100 U 100 U 57.5 J 100 U Aluminum T 87 ug/I 137 125 163 132 129 151 226 79.9 J Antimony D -- ug/I 8.2 0.5 U 0.5 U 0.5 U 0.5 U 0.13 J 0.5 U 0.52 Antimony T 640 ug/I 8.5 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.58 Arsenic D 150 ug/I 10.5 1.7 0.46 0.42 0.21 0.59 0.18 0.3 Arsenic T 10 ug/I 12.9 1.7 0.55 0.41 0.25 0.61 0.23 0.42 Barium D -- ug/I 138 16.2 15.6 14.4 13.9 16.5 12.8 21.8 Barium T 200000 ug/I 152 17.6 16.3 16.3 16.2 16.2 15.2 24 Beryllium D 6.5 ug/I 0.027 J+ 0.025 J+ 0.019 J+ 0.037 J+ 0.025 J+ 0.019 J+ 0.019 J+ 0.026 J+ Beryllium T -- ug/I 0.03 J+ 0.043 J+ 0.018 J+ 0.025 J+ 0.044 J+ 0.1 U 0.037 J+ 0.1 U Boron D -- ug/I 207 39.8 J 37.1 J 26 J 50 U 37 J 50 U 26.3 J Boron T -- ug/I 227 41.3 J 36.7 J 27.7 J 50 U 35.9 J 50 U 29.3 J 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 0.08 U Cadmium T -- ug/I 0.08 U 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 29400 12200 11800 11300 10900 11700 10800 14600 Carbon N -- ug/I 2300 1400 1300 1300 1500 1500 1700 2600 Chloride N 230000 ug/I 9900 8100 8100 8200 8200 8100 8200 14400 Chromium D 11 ug/I 0.28 J+ 0.39 J+ 0.4 J+ 0.39 J+ 0.52 J+ 0.58 J+ 0.36 J+ 0.28 J+ Chromium T -- ug/I 0.37 J+ 0.28 J+ 0.32 J+ 0.36 J+ 0.29 J+ 0.34 J+ 0.5 J+ 0.4 J+ Chromium 6+ T -- ug/I 0.092 0.059 0.059 0.069 0.11 0.042 J- 0.058 0.018 J Cobalt D -- ug/I 0.17 0.27 0.24 0.22 0.23 0.24 0.11 0.34 Cobalt T 4 ug/I 0.34 0.29 0.34 0.27 0.25 0.34 0.26 0.27 Copper D 2.7 ug/I 2.1 J+ 1.8 J+ 0.92 J+ 1.5 J+ 1.2 J+ 1 J+ 1.7 J+ 1.6 J+ Copper T -- ug/I 1.2 0.63 0.71 0.74 1.2 0.78 1.1 1.1 Iron D -- ug/I 35.7 J 25.3 J 50 U 43.5 J 41.4 J 50 U 39.2 J 180 Iron T -- ug/I 154 191 231 207 208 239 334 383 J Lead D 0.54 ug/I 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U Lead T -- ug/I 0.15 0.097 J 0.14 0.12 0.23 0.14 0.26 0.12 Magnesium T -- ug/I 7880 3890 3840 3780 3700 3780 3600 6320 Manganese D -- ug/I 37.5 90.9 82 63.4 45.8 73.6 16.4 156 Manganese T -- ug/I 65.8 101 85.3 68.4 54 83.1 40.9 119 J Mercury T 0.012 ug/I 0.00204 J+ 0.0014 J+ 0.000967 J+ 0.00101 J+ 0.00104 J+ 0.00104 J+ 0.0012 J+ 0.00123 J+ Methane N -- ug/I 10 U 10 U 13.3 10 U 10 U 10 U 10 U 16.4 Molybdenum D -- ug/I 49.4 2.2 1.6 0.97 0.58 2.1 0.14 J 0.39 J Molybdenum T 2000 ug/I 53 2.1 1.8 0.87 0.41 J 1.6 0.13 J 0.42 J Nickel D 16 ug/I 3.3 J+ 1.7 J+ 0.93 J+ 0.88 J+ 1.5 J+ 1 J+ 0.79 J+ 0.85 J+ Nickel T -- ug/I 2.2 0.5 U 0.5 U 0.5 U 0.5 U 0.45 J 0.52 0.55 Nitrogen, NO2 plus NO3 N -- ug/I 20 U 210 220 230 240 200 270 160 Potassium T -- ug/I 5720 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Selenium D -- ug/I 3.4 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 5 ug/I 3.1 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 11600 8620 8580 8160 8090 8490 7790 10300 Strontium D -- ug/I 469 125 119 110 101 121 94.6 126 Strontium T 40000 ug/I 510 132 116 117 113 118 101 139 Sulfate N -- ug/I 66500 11700 11100 8800 7500 10900 6000 12100 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.2 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U Dan River Steam Station Page 1 of 4 CSA Supplement 2 Table 3-3: Round 5 Analytical Results of Surface Water Locations 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 02B SWQS Class B standards. 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 026 =North Carolina surface water standards as specified in T15 NCAC 026 .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 2 of 4 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: SW -1 4/25/2016 N DR -SW -1 Round 5 SW -10 4/25/2016 N DR -SW -10 Round 5 SW -11 4/25/2016 N DR -SW -11 Round 5 SW -12 4/25/2016 N DR -SW -12 Round 5 SW -13 4/25/2016 N DR -SW -13 Round 5 SW -3 4/25/2016 N DR -SW -3 Round 5 SW -4 4/25/2016 N DR -SW -4 Round 5 SW -5 4/25/2016 N DR -SW -5 Round 5 Constituent Fraction NCDEQ 026 SWQS Unit (Class C) Thallium T 0.47 ug/I 0.19 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 -- ug/I 165000 92000 87000 94000 74000 93000 79000 114000 Total Suspended Solids N -- ug/I 58900 2500 U 6800 5000 U 2500 U 5200 2600 U 2500 U Vanadium D -- ug/I 3.3 0.34 0.29 J 0.31 0.29 J 0.3 J 0.27 J 0.23 J Vanadium T -- ug/I 4.5 0.43 0.51 0.44 0.39 0.53 0.58 0.45 Zinc D 36 ug/I 4.8 J+ 10 U 10 U 10 U 4.6 J+ 3.7 J+ 10 U 5.1 J+ Zinc T -- ug/I 126 10 U 10 U 10 U 6.2 J 10 U 4 J 3.6 J Dissolved Oxygen N -- mg/I 5.95 7.12 7.45 6.71 7.19 7.59 7.34 6.56 Oxidation Reduction Potential N -- mV 101.4 93 115.4 96.7 95.1 95.9 90.7 110.2 pH N 6.0 - 9.0 SU 7.9 7.9 8.4 8 7.9 7.7 7.8 7.4 Specific Conductivity N -- NS/cm 291.1 91.8 210.8 144.1 137.8 151.7 128 196.6 Temperature N -- Deg C 22.8 19.1 20.3 18.6 20.1 20.7 18.7 22.7 Turbidity, field N -- NTU 9.34 13.06 9.03 7.25 6.35 8.56 6.3 4.2 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 02B SWQS Class B standards. 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 026 =North Carolina surface water standards as specified in T15 NCAC 026 .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 2 of 4 CSA Supplement 2 Table 3-3: Round 5 Analytical Results of Surface Water Locations Dan River Steam Station Page 3 of 4 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: SW -5 4/25/2016 FD DR -SW -5 -FD -MRM -1 Round 5 SW -6 4/26/2016 N DR -SW -6 Round 5 SW -7 4/26/2016 N DR -SW -7 Round 5 SW -8 4/26/2016 N DR -SW -8 Round 5 Constituent Fraction NCDEQ 02B SWQS (Class C) Unit Alkalinity, CO3 N -- ug/I 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N -- ug/I 50100 21500 22100 21500 Alkalinity, lab N -- ug/I 50100 21500 22100 21500 Aluminum D -- ug/I 100 U 100 U 100 U 100 U Aluminum T 87 ug/I 87.6 J 77 J- 78.8 J 85.8 J Antimony D -- ug/I 0.54 0.5 U 0.14 J 0.5 U Antimony T 640 ug/I 0.52 0.5 U 0.5 U 0.5 U Arsenic D 150 ug/I 0.33 0.1 0.086 J 0.099 J Arsenic T 10 ug/I 0.43 0.13 0.12 0.13 Barium D -- ug/I 22 15.8 15.9 16.2 Barium T 200000 ug/I 24.7 18.4 J- 18.6 18.8 Beryllium D 6.5 ug/I 0.025 J+ 0.014 J+ 0.035 J+ 0.028 J+ Beryllium T -- ug/I 0.013 J+ 0.013 J+ 0.1 U 0.02 J+ Boron D -- ug/I 25.2 J 34 J 32.2 J 31.2 J Boron T -- ug/I 27.6 J 41.6 J- 42.7 J 39.6 J Cadmium D 0.15 ug/I 0.08 U 0.08 U 0.08 U 0.08 U Cadmium T -- ug/I 0.08 U 0.08 U 0.08 U 0.08 U Calcium T -- ug/I 14600 5660 5730 5670 Carbon N -- ug/I 3100 1400 1500 1500 Chloride N 230000 ug/I 14500 4700 4800 4700 Chromium D 11 ug/I 0.32 J+ 0.32 J+ 0.51 J+ 0.25 J+ Chromium T -- ug/I 0.38 J+ 0.54 J+ 0.58 J+ 0.51 J+ Chromium 6+ T -- ug/I 0.012 J 0.046 0.026 J 0.029 J Cobalt D -- ug/I 0.34 0.092 J 0.1 0.12 Cobalt T 4 ug/I 0.38 0.16 0.17 0.19 Copper D 2.7 ug/I 0.95 J+ 0.99 J+ 0.83 J+ 1.1 J+ Copper T -- ug/I 1 0.7 0.72 0.76 Iron D -- ug/I 179 115 125 68.1 Iron T -- ug/I 580 J 331 J- 314 361 Lead D 0.54 ug/I 0.1 U 0.1 U 0.1 U 0.1 U Lead T -- ug/I 0.14 0.14 0.16 0.16 Magnesium T -- ug/I 6330 2170 2170 2150 Manganese D -- ug/I 157 17.5 17.5 24.7 Manganese T -- ug/I 177 J 26.2 J- 26 32.1 Mercury T 0.012 ug/I 0.00132 J+ 0.00104 0.00115 0.00173 Methane N -- ug/I 47 10 U 10 U 12.1 Molybdenum D -- ug/I 0.42 J 0.25 J 0.28 J 0.24 J Molybdenum T 2000 ug/I 0.4 J 0.29 J 0.26 J 0.25 J Nickel D 16 ug/I 0.51 J+ 0.52 0.73 0.85 Nickel T -- ug/I 0.54 0.5 U 0.5 J 0.53 Nitrogen, NO2 plus NO3 N -- ug/I 150 130 150 160 Potassium T -- ug/I 5000 U 5000 U 5000 U 5000 U Selenium D -- ug/I 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 5 ug/I 0.5 U 0.5 U 0.5 U 0.5 U Sodium T -- ug/I 10400 4360 J 4540 J 4330 J Strontium D -- ug/I 127 36.8 37.4 36.4 Strontium T 40000 ug/I 136 41.6 J- 42.8 41.4 Sulfate N -- ug/I 12200 3800 3900 3700 Sulfide N -- ug/I 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.1 U 0.1 U 0.1 U 0.1 U Dan River Steam Station Page 3 of 4 CSA Supplement 2 Table 3-3: Round 5 Analytical Results of Surface Water Locations 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 02B SWQS Class B standards. 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 026 =North Carolina surface water standards as specified in T15 NCAC 026 .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 4 of 4 CSA Supplement 2 Location: Date: Sample Type: Sample Name: Event: SW -5 4/25/2016 FD DR -SW -5 -FD -MRM -1 Round 5 SW -6 4/26/2016 N DR -SW -6 Round 5 SW -7 4/26/2016 N DR -SW -7 Round 5 SW -8 4/26/2016 N DR -SW -8 Round 5 Constituent Fraction NCDEQ 026 SWQS Unit (Class C) Thallium T 0.47 ug/I 0.1 U 0.1 U 0.1 U 0.1 U Total Dissolved Solids N -- ug/I 115000 43000 37000 41000 Total Suspended Solids N -- ug/I 3100 4200 4200 7400 Vanadium D -- ug/I 0.3 0.5 J+ 0.55 J+ 0.46 J+ Vanadium T -- ug/I 0.46 0.78 0.76 0.86 Zinc D 36 ug/I 4.6 J+ 3.2 J+ 10 U 10 U Zinc T -- ug/I 5.2 J 10 UJ 7.2 J 10 U Dissolved Oxygen N -- mg/I 6.56 8.96 -- 5.3 Oxidation Reduction Potential N -- mV 110.2 109.8 -- 118.7 pH N 6.0-9.0 SU 7.4 6.9 -- 6.8 Specific Conductivity N -- NS/cm 196.6 71.7 -- 75.7 Temperature N -- Deg C 22.7 18.2 -- 20.3 Turbidity, field N -- NTU 4.2 4.79 -- 12.9 50 Exceeds NCDEQ 02L GWQS, IMAC, or DHHS standards. 50 Exceeds NCDEQ 02B SWQS Class B standards. 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 026 =North Carolina surface water standards as specified in T15 NCAC 026 .0211 and .0216 (amended effective January 2015) 02L =North Carolina groundwater standards as specified in T15A NCAC 02L D =dissolved Deg C =degree Celsius DHHS =North Carolina Department of Health and Human Services DO =dissolved oxygen GW =groundwater GWQS =groundwater quality standard IMAC = Interim Maximum Allow Concentration N =normal NS = no standard T =total TDS =total dissolved solids TOC =total organic carbon Dan River Steam Station Page 4 of 4 CSA Supplement 2 Table 3-4: Summary of Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation AB -10D 6/26/2015 539.42 47.28 492.14 9/2/2015 47.32 492.10 6/12/2016 46.65 492.77 AB -105 6/26/2015 539.44 19.12 520.32 9/2/2015 19.40 520.04 6/12/2016 20.99 572.45 AB-10SL 6/26/2015 539.42 40.58 498.84 9/2/2015 40.91 498.51 6/12/2016 40.93 498.49 AB-25BR 6/26/2015 542.90 56.78 486.12 9/2/2015 57.05 485.85 6/12/2016 55.77 487.13 AB -25D 6/26/2015 542.97 51.46 491.51 9/2/2015 52.20 490.77 6/12/2016 48.81 494.16 AB -255 6/26/2015 542.87 46.30 496.57 9/2/2015 47.39 495.48 6/12/2016 42.80 500.07 AB-30BR 6/26/2015 529.27 39.37 489.90 9/2/2015 23.24 506.03 6/12/2016 40.44 488.77 AB -30D 6/26/2015 529.47 38.87 490.60 9/2/2015 38.92 490.55 6/12/2016 39.03 490.41 AB -305 6/26/2015 529.34 15.16 514.18 9/2/2015 15.19 514.15 6/12/2016 17.13 512.15 AB-35BR 6/26/2015 531.99 23.01 508.98 9/2/2015 22.46 509.53 6/12/2016 23.60 508.39 AB -5D 6/26/2015 533.85 12.29 521.56 9/2/2015 12.47 521.38 6/12/2016 13.33 520.52 AB -5S 6/26/2015 534.00 11.94 522.06 9/2/2015 12.12 521.88 6/12/2016 13.20 520.80 AS -10D 6/26/2015 591.84 21.78 570.06 9/2/2015 23.22 568.62 6/12/2016 -- -- AS -125 6/26/2015 559.70 10.75 548.95 9/2/2015 11.54 548.16 6/12/2016 9.84 549.86 AS -2D 6/26/2015 561.00 32.68 528.32 9/2/2015 32.82 528.18 6/12/2016 29.99 531.04 Dan River Steam Station Page 1 of 7 CSA Supplement 2 Table 3-4: Summary of Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation AS -4D 6/26/2015 562.17 17.50 544.67 9/2/2015 17.98 544.19 6/12/2016 -- -- AS -6D 6/26/2015 586.66 35.41 551.25 9/2/2015 36.31 550.35 6/12/2016 -- -- AS-8BR 6/26/2015 582.10 36.71 545.39 9/2/2015 37.25 544.85 6/12/2016 34.09 548.01 AS -8D 6/26/2015 582.23 37.10 545.13 9/2/2015 37.57 544.66 6/12/2016 34.60 547.63 BG -1D 6/26/2015 516.40 16.02 500.38 9/2/2015 16.67 499.73 6/12/2016 15.68 500.72 BG -5D 6/26/2015 514.91 7.74 507.17 9/2/2015 7.89 507.02 6/12/2016 6.68 508.23 BG -5S 6/26/2015 515.24 7.95 507.29 9/2/2015 7.98 507.26 6/12/2016 6.61 508.63 GWA-10D 6/29/2015 553.56 33.56 520.00 9/2/2015 33.67 519.89 6/12/2016 33.15 520.49 GWA-105 6/29/2015 553.40 30.33 523.07 9/2/2015 30.27 523.13 6/12/2016 -- -- GWA-11D 6/26/2015 559.77 18.32 541.45 9/2/2015 19.65 540.12 6/12/2016 17.53 542.25 GWA-115 6/26/2015 560.13 19.78 540.35 9/2/2015 20.08 540.05 6/12/2016 18.28 541.84 GWA-12D 6/29/2015 584.45 20.14 564.31 9/2/2015 21.05 563.40 6/12/2016 18.53 565.96 GWA-125 6/29/2015 584.90 12.41 572.49 9/2/2015 13.70 571.20 6/12/2016 11.90 573.03 GWA-14D 6/26/2015 500.19 6.54 493.65 9/2/2015 6.17 494.02 6/12/2016 6.02 494.17 GWA-145 6/26/2015 499.97 10.92 489.05 9/2/2015 9.22 490.75 6/12/2016 9.02 490.95 Dan River Steam Station Page 2 of 7 CSA Supplement 2 Table 3-4: Summary of Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation GWA-15D 6/26/2015 504.13 22.60 481.53 9/2/2015 22.82 481.31 6/12/2016 21.91 482.22 GWA-15S 6/26/2015 504.21 DRY -- 9/2/2015 DRY -- 6/12/2016 DRY -- GWA-1D 6/29/2015 601.58 30.57 571.01 9/2/2015 32.09 569.49 6/12/2016 27.00 574.58 GWA-1S 6/29/2015 601.39 28.81 572.58 9/2/2015 32.25 569.14 6/12/2016 24.88 576.51 GWA-2D 6/26/2015 588.04 27.76 560.28 9/2/2015 29.17 558.87 6/12/2016 -- -- GWA-2S 6/26/2015 587.57 23.45 564.12 9/2/2015 25.00 562.57 6/12/2016 -- -- GWA-3D 6/26/2015 574.04 24.22 549.82 9/2/2015 24.72 549.32 6/12/2016 -- -- GWA-3S 6/26/2015 573.98 21.02 552.96 9/2/2015 21.32 552.66 6/12/2016 -- -- GWA-4D 6/26/2015 527.20 27.25 499.95 9/2/2015 27.05 500.15 6/12/2016 27.59 499.61 GWA-4S 6/26/2015 527.87 21.99 505.88 9/2/2015 21.78 506.09 6/12/2016 22.76 505.11 GWA-5BR 6/26/2015 499.73 3.43 496.30 9/2/2015 3.11 496.62 6/12/2016 3.10 496.63 GWA-6D 6/26/2015 501.20 17.94 483.26 9/2/2015 17.48 483.72 6/12/2016 16.35 484.85 GWA-6S 6/26/2015 501.48 13.53 487.95 9/2/2015 14.54 486.94 6/12/2016 12.54 488.94 GWA-7D 6/26/2015 543.48 17.33 526.15 9/2/2015 18.61 524.87 6/12/2016 16.18 527.30 GWA-7S 6/26/2015 543.16 16.08 527.08 9/2/2015 17.58 525.58 6/12/2016 14.94 528.22 Dan River Steam Station Page 3 of 7 CSA Supplement 2 Table 3-4: Summary of Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation GWA-8D 6/26/2015 584.01 16.26 567.75 9/2/2015 17.28 566.73 6/12/2016 14.06 569.95 GWA-8S 6/26/2015 583.87 15.35 568.52 9/2/2015 15.86 568.01 6/12/2016 12.93 570.94 GWA-9D 6/29/2015 611.30 30.93 580.37 9/2/2015 32.15 579.15 6/12/2016 26.78 584.52 GWA-9S 6/29/2015 611.72 30.22 581.50 9/2/2015 31.42 580.30 6/12/2016 25.65 586.07 MW-10 6/29/2015 531.81 -- -- 9/2/2015 DRY -- 6/12/2016 DRY -- MW -10D 6/29/2015 532.05 50.05 482.00 9/2/2015 50.61 481.44 6/12/2016 49.15 482.65 MW-11 6/29/2015 531.16 -- -- 9/2/2015 -- -- 6/12/2016 DRY -- MW-11D 6/29/2015 531.83 DRY -- 9/2/2015 38.70 493.13 6/12/2016 38.31 492.85 MW -12 6/29/2015 593.59 20.91 572.68 9/2/2015 22.42 571.17 6/12/2016 19.22 574.37 MW -12D 6/29/2015 593.23 20.52 572.71 9/2/2015 22.08 571.15 6/12/2016 17.87 575.36 MW -20D 6/29/2015 562.23 4.13 558.10 9/2/2015 5.10 557.13 6/12/2016 -- -- M W -20S 6/29/2015 562.28 5.78 556.50 9/2/2015 6.54 555.74 6/12/2016 -- -- MW -21D 6/29/2015 498.90 2.35 496.55 9/2/2015 1.88 497.02 6/12/2016 -- -- MW21S 6/29/2015 498.80 5.42 493.38 9/2/2015 5.06 493.74 6/12/2016 -- -- MW-22BR 6/26/2015 502.32 15.82 486.50 9/2/2015 16.26 486.06 6/12/2016 14.19 488.13 Dan River Steam Station Page 4 of 7 CSA Supplement 2 Table 3-4: Summary of Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation MW -22D 6/29/2015 504.52 38.96 465.56 9/2/2015 DRY -- 6/12/2016 -- -- M W -22S 6/29/2015 505.19 20.42 484.77 9/2/2015 20.89 484.30 6/12/2016 -- -- MW-23BR 6/26/2015 527.55 FLOWING ARTESIAN -- 9/2/2015 FLOWING ARTESIAN -- 6/12/2016 FLOWING ARTESIAN -- MW -23D 6/29/2015 528.22 14.75 513.47 9/2/2015 14.12 514.10 6/12/2016 12.75 515.47 MW-301BR 6/29/2015 593.55 22.91 570.64 9/2/2015 24.10 569.45 6/12/2016 -- -- MW-303BR 6/26/2015 651.37 93.52 557.85 9/2/2015 93.74 557.63 6/12/2016 -- -- MW-306BR 6/26/2015 613.62 69.28 544.34 9/2/2015 69.81 543.81 6/12/2016 -- -- MW-308BR 6/26/2015 532.59 11.51 521.08 9/2/2015 11.45 521.14 6/12/2016 12.45 520.14 MW-310BR 6/26/2015 538.91 17.43 521.48 9/2/2015 17.36 521.55 6/12/2016 17.72 521.19 MW-311BR 6/26/2015 537.73 41.85 495.88 9/2/2015 42.22 495.51 6/12/2016 41.14 496.59 MW-314BR 6/26/2015 539.75 29.30 510.45 9/2/2015 29.67 510.08 6/12/2016 27.20 512.55 MW-315BR 6/26/2015 570.75 45.18 525.57 9/2/2015 45.58 525.17 6/12/2016 45.29 525.46 MW-317BR 6/26/2015 571.93 24.18 547.75 9/2/2015 24.38 547.55 6/12/2016 21.94 549.99 MW -318D 6/26/2015 567.21 30.49 536.72 9/2/2015 30.72 536.49 6/12/2016 29.36 537.85 MW -9 6/29/2015 526.41 20.39 506.02 9/2/2015 DRY -- 6/12/2016 DRY -- Dan River Steam Station Page 5 of 7 CSA Supplement 2 Table 3-4: Summary of Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation MW -9D 6/29/2015 527.04 33.19 493.85 9/2/2015 34.24 492.80 6/12/2016 31.57 495.47 OW -301D 6/29/2015 593.99 10.42 583.57 9/2/2015 112.72 481.27 OW -302D 6/26/2015 586.53 36.80 549.73 9/2/2015 11.31 575.22 OW -303D 6/26/2015 650.43 79.41 571.02 9/2/2015 29.66 620.77 OW -304D 6/29/2015 560.22 9.92 550.30 -- -- -- OW -305D 6/26/2015 560.86 14.56 546.30 9/2/2015 11.62 549.24 OW -3055 6/26/2015 561.22 12.97 548.25 9/2/2015 11.45 549.77 OW -306D 6/29/2015 611.15 63.04 548.11 9/2/2015 14.14 597.01 OW -3065 6/29/2015 609.85 51.23 558.62 9/2/2015 13.27 596.58 OW -307D 6/29/2015 534.88 18.23 516.65 9/2/2015 13.66 521.22 OW -308D 6/29/2015 531.29 6.14 525.15 9/2/2015 6.75 524.54 OW -309D 6/29/2015 529.02 7.54 521.48 9/2/2015 4.07 524.95 OW -3105 6/29/2015 539.32 19.62 519.70 9/2/2015 -- -- OW -311D 6/29/2015 536.75 22.12 514.63 9/2/2015 29.66 507.09 OW-312D 6/29/2015 523.74 -- -- 9/2/2015 27.55 496.19 Dan River Steam Station Page 6 of 7 CSA Supplement 2 Table 3-4: Summary of Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation OW -312S 6/29/2015 524.66 27.62 497.04 -- -- OW -313D 6/29/2015 535.86 28.93 506.93 9/2/2015 3.20 532.66 OW -314D 6/29/2015 541.30 32.21 509.09 9/2/2015 10.65 530.65 OW-314S 6/29/2015 540.88 DRY -- 9/2/2015 62.19 478.69 OW -315D 6/29/2015 569.29 22.12 547.17 9/2/2015 19.89 549.40 OW -315S 6/29/2015 569.25 15.49 553.76 9/2/2015 3.09 566.16 OW -317D 6/29/2015 572.86 15.28 557.58 9/2/2015 6.13 566.73 OW -3186R 6/29/2015 567.16 29.78 537.38 9/2/2015 1.80 565.36 OW-319D 6/29/2015 581.68 DRY -- 9/2/2015 2.30 579.38 OW -3195 6/29/2015 582.07 23.98 558.09 9/2/2015 55.56 526.51 OW -320D 6/29/2015 610.39 3.00 607.39 9/2/2015 DRY -- OW -321D 6/26/2015 592.01 11.06 580.95 9/2/2015 55.34 536.67 Dan River Steam Station Page 7 of 7 CSA Supplement 2 Table 3-S: Summary of Cation -Anion Balance Differences Site Location Constituent: Molecular Weight (g/mol) Charge Equivalent Weight : Matrix Date Alkalinity, CO3 60 2 30 Result eq/L Alkalinity, HCO3 61 1 61 Result eq/L Anions Chloride 35.5 1 35.5 Result eq/L Nitrogen, NO2 plus NO3 62 1 62 Result eq/L Sulfate 96.1 2 48.05 Result eq/L An ons eq/L Calcium 40.1 2 20.05 Result eq/L Magnesium 24.3 2 12.15 Result eq/L Cations Potassium 39.1 1 39.1 Result eq/L Sodium 23 1 23 Result eq/L Cat ons eq/L Charge Balance (%) Riverbend SW -1 SW -10 Surface Water Surface Water 4/25/2016 4/25/2016 0 0 0 0 54 39.1 0.885 0.641 9.9 8.1 0.279 0.228 0 0.21 0 0.003 66.5 11.7 1.384 0.243 2.548 1.115 29.4 12.2 1.466 0.608 7.88 3.89 0.649 0.32 5.72 0 0.146 0 11.6 8.62 0.504 0.375 2.765 1.303 4.1% 7.8% SW -11 Surface Water 4/25/2016 0 0 39.7 0.651 8.1 0.228 0.22 0.004 11.1 0.231 1.114 11.8 0.589 3.84 0.316 0 0 8.58 0.373 1.278 6.9% 5W-12 Surface Water 4/25/2016 0 0 40.3 0.661 8.2 0.231 0.23 0.004 8.8 0.183 1.079 11.3 0.564 3.78 0.311 0 0 8.16 0.355 1.23 6.5% SW -13 Surface Water 4/25/2016 0 0 38.4 0.63 8.2 0.231 0.24 0.004 7.5 0.156 1.021 10.9 0.544 3.7 0.305 0 0 8.09 0.352 1.201 8.1% SW -3 Surface Water 4/25/2016 0 0 38.9 0.638 8.1 0.228 0.2 0.003 10.9 0.227 1.096 11.7 0.584 3.78 0.311 0 0 8.49 0.369 1.264 7.1% SW -4 Surface Water 4/25/2016 0 0 39.6 0.649 8.2 0.231 0.27 0.004 6 0.125 1.009 10.8 0.539 3.6 0.296 0 0 7.79 0.339 1.174 7.6% SW -5 Surface Water 4/25/2016 0 0 50.6 0.83 14.4 0.406 0.16 0.003 12.1 0.252 1.491 14.6 0.728 6.32 0.52 0 0 10.3 0.448 1.696 6.4% SW -6 Surface Water 4/26/2016 0 0 21.5 0.352 4.7 0.132 0.13 0.002 3.8 0.079 0.565 5.66 0.282 2.17 0.179 0 0 4.36 0.19 0.651 7.1% SW -7 Surface Water 4/26/2016 0 0 22.1 0.362 4.8 0.135 0.15 0.002 3.9 0.081 0.58 5.73 0.286 2.17 0.179 0 0 4.54 0.197 0.662 6.6% SW -8 Surface Water 4/26/2016 0 0 21.5 0.352 4.7 0.132 0.16 0.003 3.7 0.077 0.564 5.67 0.283 2.15 0.177 0 0 4.33 0.188 0.648 6.9% AB -10D Groundwater 4/25/2016 0 0 84.7 1.389 16.4 0.462 0 0 26.5 0.552 2.403 39.3 1.96 5.91 0.486 0 0 27.4 1.191 3.637 20.4% AB-25BR Groundwater 4/25/2016 0 0 84.3 1.382 22.2 0.625 0 0 98 2.04 4.047 45.6 2.274 9.71 0.799 0 0 25.5 1.109 4.182 1.6% AB -25D Groundwater 4/25/2016 0 0 61.1 1.002 20.2 0.569 0 0 84.6 1.761 3.332 31.8 1.586 12.2 1.004 0 0 20.7 0.9 3.49 2.3% AB-30BR Groundwater 4/25/2016 0 0 191 3.131 14.6 0.411 0 0 123 2.56 6.102 95.7 4.773 15.2 1.251 0 0 16.3 0.709 6.733 4.9% AB -30D Groundwater 4/25/2016 0 0 120 1.967 20.9 0.589 0 0 92 1.915 4.471 64.8 3.232 10.9 0.897 0 0 13.6 0.591 4.72 2.7% AB -30S Groundwater 4/25/2016 0 0 5.3 0.087 10 0.282 0 0 82.7 1.721 2.09 8.94 0.446 5.58 0.459 0 0 25.4 1.104 2.009 -2.0% AB-35BR Groundwater 4/26/2016 0 0 254 4.164 11.7 0.33 0 0 121 2.518 7.012 93.2 4.648 18.3 1.506 15.3 0.391 26.2 1.139 7.684 4.6% AB -5D Groundwater 4/25/2016 0 0 176 2.885 19.6 0.552 0 0 77.5 1.613 5.05 65.9 3.287 13.8 1.136 3.97 0.102 20 0.87 5.395 3.3% AS -12S Groundwater 4/26/2016 0 0 184 3.016 18.1 0.51 0.024 0 78.3 1.63 5.156 37.9 1.89 30.3 2.494 0 0 31.5 1.37 5.754 5.5% AS -2D Groundwater 4/26/2016 0 0 251 4.115 17.5 0.493 0 0 179 3.725 8.333 99.4 4.958 33.2 2.733 2.63 0.067 28.4 1.235 8.993 3.8% AS-8BR Groundwater 4/25/2016 0 0 172 2.82 6.8 0.192 0 0 69.5 1.446 4.458 65 3.242 10.2 0.84 3.15 0.081 13.8 0.6 4.763 3.3% AS -8D Groundwater 4/25/2016 0 0 120 1.967 5.3 0.149 0 0 20.9 0.435 2.551 27.6 1.377 9.59 0.789 0 0 13.9 0.604 2.77 4.1 BG -1 D Groundwater 4/4/2016 12.1 0.403 60.3 0.989 5.9 0.166 0.22 0.004 106 2.206 3.768 36.1 1.8 11.2 0.922 4.9 0.125 29.3 1.274 4.121 4.5% BG -5D Groundwater 3/28/2016 0 0 116 1.902 6.2 0.175 0.24 0.004 34.1 0.71 2.791 25 1.247 14.7 1.21 0 0 17.8 0.774 3.231 7.3% BG -5D Groundwater 4/4/2016 0 0 116 1.902 6.2 0.175 0.24 0.004 34.1 0.71 2.791 25 1.247 14.7 1.21 0 0 17.8 0.774 3.231 7.3% BG -5S Groundwater 3/28/2016 0 0 73.6 1.207 6.7 0.189 0.46 0.007 33.6 0.699 2.102 16.8 0.838 11.4 0.938 0 0 17 0.739 2.515 8.9% GWA-10D Groundwater 4/26/2016 0 0 68 1.115 9.3 0.262 0.24 0.004 61.2 1.274 2.655 22.9 1.142 12.5 1.029 0 0 15.6 0.678 2.849 3.5% GWA-11 D Groundwater 4/26/2016 0 0 176 2.885 11.2 0.315 0 0 40.5 0.843 4.043 50.5 2.519 17.1 1.407 0 0 16.6 0.722 4.648 7.0% GWA-11 S Groundwater 4/26/2016 0 0 25.1 0.411 10.4 0.293 0.31 0.005 4.7 0.098 0.807 5.47 0.273 2.8 0.23 0 0 9.53 0.414 0.917 6.4% GWA-12D Groundwater 3/28/2016 0 0 201 3.295 4 0.113 0.1 0.002 19.6 0.408 3.818 50.9 2.539 17.8 1.465 0 0 9.69 0.421 4.425 7.4% GWA-12S Groundwater 3/28/2016 0 0 9.7 0.159 3.3 0.093 1.5 0.024 24.9 0.518 0.794 6.76 0.337 4.16 0.342 0 0 5.72 0.249 0.928 7.8% GWA-14D Groundwater 4/25/2016 0 0 157 2.574 12.1 0.341 0.021 0 106 2.206 5.121 78..2 3.9 8.15 0.671 0 0 21.9 0.952 5.523 3.8% GWA-14S Groundwater 4/25/2016 0 0 45.4 0.744 5.5 0.155 0.12 0.002 21.9 0.456 1.357 8.97 0.447 4.78 0.393 0 0 9.53 0.414 1.254 -3.9% GWA-14S Groundwater 4/26/2016 0 0 45.4 0.744 5.5 0.155 0.12 0.002 21.9 0.456 1.357 8.97 0.447 4.78 0.393 0 0 9.53 0.414 1.254 -3.9% GWA-15D Groundwater 4/25/2016 0 0 118 1.934 10.5 0.296 0.036 0.001 148 3.08 5.311 72 3.591 15 1.235 4.31 0.11 17 0.739 5.675 3.3% GWA-1 D Groundwater 4/26/2016 219 7.3 0 0 3.6 0.101 0 0 20 0.416 7.817 14 0.698 0 0 209 5.345 63 2.739 8.782 5.8% GWA-1 S Groundwater 4/25/2016 0 0 55.8 0.915 2 0.056 0.03 0 3.2 0.067 1.038 2.96 0.148 3.76 0.309 0 0 16.5 0.717 1.174 6.1 GWA-4D Groundwater 4/26/2016 0 0 41.8 0.685 12.1 0.341 0 0 42.5 0.884 1.91 15.5 0.773 6.33 0.521 0 0 18.1 0.787 2.081 4.3% GWA-4S Groundwater 4/26/2016 0 0 50.4 0.826 7.9 0.223 0 0 47 0.978 2.027 21.2 1.057 5.56 0.458 4.13 0.106 14.1 0.613 2.234 4.9% GWA-5BR Groundwater 4/26/2016 0 0 165 2.705 17.6 0.496 0 0 419 8.72 11.921 184 9.177 24.5 2.016 0 0 19.8 0.861 12.054 0.6% GWA-6D Groundwater 4/25/2016 0 0 121 1.984 18.1 0.51 0 0 61 1.27 3.764 40.1 2 11 0.905 0 0 27 1.174 4.079 4.0% GWA-6S Groundwater 4/25/2016 0 0 248 4.066 14.9 0.42 0 0 10.4 0.216 4.702 69.6 3.471 9.87 0.812 8.03 0.205 23.2 1.009 5.497 7.8% GWA-7D Groundwater 4/25/2016 0 0 51.2 0.839 3 0.085 0 0 106 2.206 3.13 25,2 1.257 13 1.07 0 0 22.3 0.97 3.297 2.6% Dan River Steam Station Page 1 of 2 CSA Supplement 2 Table 3-S: Summary of Cation -Anion Balance Differences Site Location Constituent: Molecular Weight (g/mol) Charge Equivalent Weight : Matrix Date Anions Cations Charge Balance (%) Alkalinity, CO3 Alkalinity, HCO3 Chloride Nitrogen, NO2 Sulfate plus NO3 60 61 35.5 62 96.1 An ons 2 1 1 1 2 30 61 35.5 62 48.05 Calcium Magnesium Potassium Sodium 40.1 24.3 39.1 23 Cat ons 2 2 1 1 20.05 12.15 39.1 23 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 GWA-7S Groundwater 4/25/2016 0 0 1.3 0.021 2.2 0.062 1.2 0.019 210 4.37 4.472 37.4 1.865 23.2 1.909 0 0 15.4 0.67 4.444 -0.3% GWA-8D Groundwater 4/25/2016 0 0 142 2.328 3.9 0.11 0 0 388 8.075 10.513 125 6.234 31.3 2.576 0 0 53.8 2.339 11.149 2.9% GWA-8S Groundwater 4/25/2016 0 0 75.3 1.234 5.7 0.161 0.026 0 176 3.663 5.058 27.2 1.357 20 1.646 0 0 55.1 2.396 5.399 3.3% GWA-9D Groundwater 3/28/2016 0 0 24.7 0.405 3.1 0.087 0 0 7.1 0.148 0.64 6.79 0.339 1.98 0.163 0 0 4.89 0.213 0.715 5.5% GWA-9S Groundwater 3/28/2016 0 0 12.3 0.202 4.3 0.121 0.05 0.001 4.1 0.085 0.409 1.05 0.052 0.537 0.044 3.25 0.083 7.15 0.311 0.49 9.0% MW -10D Groundwater 4/26/2016 0 0 93.6 1.534 22.3 0.628 0 0 41.5 0.864 3.026 33.8 1.686 10.6 0.872 0 0 17.3 0.752 3.31 4.5% MW -11 Groundwater 4/26/2016 **NA **NA **NA **NA **NA 3.45 0.172 1.95 0.16 0 0 18.6 0.809 1.141 -- MW-11 D Groundwater 4/25/2016 0 0 120 1.967 24.9 0.701 0.2 0.003 76.8 1.598 4.269 65.1 3.247 7.99 0.658 3.91 0.1 14.2 0.617 4.622 4.0% MW -12 Groundwater 4/25/2016 0 0 8.6 0.141 4.9 0.138 0 0 8.4 0.175 0.454 1.21 0.06 2.84 0.234 0 0 5.14 0.223 0.517 6.5% MW -12D Groundwater 4/25/2016 0 0 75 1.23 9.8 0.276 0 0 29 0.604 2.11 13.8 0.688 8.35 0.687 10.8 0.276 16.4 0.713 2.364 5.7% MW-22BR Groundwater 4/25/2016 0 0 114 1.869 18.8 0.53 0 0 42.1 0.876 3.275 0 0 0 0 0 0 0 0 0 -100.0% MW-23BR Groundwater 3/29/2016 0 0 217 3.557 4.2 0.118 0 0 11.3 0.235 3.91 57.1 2.848 20.1 1.654 0 0 13.9 0.604 5.106 13.3% MW -23D Groundwater 3/29/2016 0 0 23.1 0.379 2.7 0.076 0 0 20.3 0.422 0.877 11.9 0.594 3.92 0.323 0 0 2.88 0.125 1.042 8.6% MW-308BR Groundwater 4/25/2016 0 0 114 1.869 13.7 0.386 0 0 811 16.878 19.133 54.5 2.718 9.76 0.803 0 0 4.52 0.197 3.718 -67.5% MW-310BR Groundwater 4/26/2016 0 0 159 2.607 15.2 0.428 0 0 5.8 0.121 3.156 42.7 2.13 11.4 0.938 0 0 12.4 0.539 3.607 6.7% MW-311BR Groundwater 4/26/2016 0 0 192 3.148 23.7 0.668 0 0 46.9 0.976 4.792 60.1 2.998 12.2 1.004 38.8 0.992 25 1.087 6.081 11.9% MW-314BR Groundwater 4/26/2016 0 0 84.8 1.39 27.9 0.786 0 0 80 1.665 3.841 48.2 2.404 12.7 1.045 6.19 0.158 13.4 0.583 4.19 4.3% MW-315BR Groundwater 4/26/2016 0 0 158 2.59 3.1 0.087 0 0 44.9 0.934 3.611 57.2 2.853 9.63 0.793 0 0 12.9 0.561 4.207 7.6% MW-317BR Groundwater 4/26/2016 192 6.4 96.8 1.587 5.6 0.158 0 0 12.1 0.252 8.397 78.6 3.92 0.407 0.033 39.6 1.013 34 1.478 6.444 -13.2% MW -31$D Groundwater 4/26/2016 0 0 55.2 0.905 8.1 0.22$ 0 0 103 2.144 3.277 22.6 1.127 12.5 1.029 0 0 30.4 1.322 3.478 3.0% MW -9D Groundwater 4/26/2016 0 0 27.8 0.456 18.6 0.524 0 0 97.6 2.031 3.011 22.5 1.122 8.97 0.738 0 0 26.2 1.139 2.999 -0.2% OW -308D Groundwater 4/26/2016 0 0 42.2 0.692 9.2 0.259 0 0 108 2.248 3.199 25.5 1.272 10.3 0.848 7.65 0.196 16 0.696 3.012 -3.0% AB -10S Porewater 4/25/2016 0 0 112 1.836 13.1 0.369 0 0 28.3 0.589 2.794 29.3 1.461 6.84 0.563 6.61 0.169 18.7 0.813 3.006 3.7% AB-10SL Porewater 4/25/2016 0 0 166 2.721 20 0.563 0.24 0.004 37.9 0.789 4.077 23.6 1.177 8.32 0.685 25.6 0.655 49.7 2.161 4.678 6.9% AB -25S Porewater 4/25/2016 0 _ 0 0 0 107 60.2 1.754 0.987 15.2 9.9 0.428 0.279 0.042 0 0.001 0 68.7 152 1.43 3.163 3.613 4.429 39.1 1.95 6.9 0.568 7.21 0.184 29.5 1.283 3.985 4.9% 0.7% AB -5S Porewater 4/25/2016 51.2 2.554 11 0.905 14.4 0.368 15.3 0.665 4.492 NO2 + NO3 is being used as a surrogate for nitrate and the molecular weight of nitrate is assumed. ��MW-11 analysis not performed; insufficient volume due to slow groundwater recharge. 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 (mol) Result Value (ig) � Cations (eQ) - E Anions(eq) Equivalent Weight = eq�L = � CBE% = e eL x 100 Charge Molecular Wt.(mol�l � Cations(i )+ � Anions( ) Charge /1 Dan River Steam Station Page 2 of 2 CSA Supplement 2