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Home My WebLink AboutNC0004987_2_FINAL_CSA Supplement 2_Marshall_Tables_20160804Table 1-1: Well Construction Information Monitorin Well ID AB-10D Monitoring Well Type Deep Northing 683743.73 Easting 1415472.14 TOC Casing Elevation Stick-up 802.68 3.10 Casing Type PVC Casing Diameter 6.0 op of Bottom Screen 74.10 of Screen 79.10 Total Depth 84.20 Program CAMA AB-105 Shallow 683755.48 1415452.07 802.41 2.87 PVC 2.0 11.87 26.87 27.87 CAMA AB-10SL Shallow 683751.65 1415457.75 802.52 3.00 PVC 2.0 43.00 53.00 56.00 CAMA AB-11D Deep 685049.51 1416180.09 799.95 3.11 PVC 5.0 80.11 85.11 88.11 CAMA AB-11S Shallow 685056.24 1416188.51 800.05 3.16 PVC 2.0 9.16 19.16 19.16 CAMA AB-12D Deep 683503.70 1414672.93 795.45 2.89 PVC 5.0 64.89 69.89 73.69 CAMA AB-12S Shallow 683503.35 1414678.32 795.61 2.91 PVC 2.0 5.91 15.91 15.91 CAMA AB-12SL Shallow 683502.36 1414682.08 795.67 2.97 PVC 2.0 42.97 52.97 54.97 CAMA AB-13D Deep 684196.73 1413520.32 824.55 2.96 PVC 6.0 83.96 88.96 95.96 CAMA AB-13S Shallow 684180.48 1413524.42 823.73 2.52 PVC 2.0 17.32 32.32 33.52 CAMA AB-14D Deep 683676.24 1412767.69 824.11 2.66 PVC 5.0 82.66 87.66 93.76 CAMA AB-14S Shallow 683679.54 1412755.12 824.71 2.98 PVC 2.0 8.68 23.68 23.68 CAMA AB-15BR Bedrock 684803.85 1413514.37 823.01 2.97 PVC 6.0 109.97 114.97 118.77 CAMA AB-15D Deep 684822.45 1413524.15 823.04 2.78 PVC 6.0 66.78 71.78 77.78 CAMA AB-15S Shallow 684814.88 1413521.39 823.27 3.13 PVC 2.0 8.13 23.13 23.13 CAMA AB-15SL Shallow 684808.89 1413518.56 823.17 3.15 PVC 2.0 43.15 53.15 57.15 CAMA AB-16D Deep 685497.55 1413778.99 822.45 2.95 PVC 6.0 43.95 48.95 50.05 CAMA AB-165 Shallow 685490.38 1413784.53 822.08 3.06 PVC 2.0 6.26 16.26 16.66 CAMA AB-17D Deep 686446.33 1413066.01 833.56 2.98 PVC 6.0 108.98 113.98 123.98 CAMA AB-17S AB-18D AB-18S AB-1BR Shallow Deep Shallow Bedrock 686446.68 685663.31 685664.48 681572.86 1413054.46 1412917.88 1412929.98 1417706.31 833.29 825.20 825.40 777.21 3.00 2.96 3.14 2.38 PVC PVC PVC PVC 2.0 6.0 2.0 6.0 9.00 74.96 6.14 121.38 24.00 79.96 16.14 126.38 25.01 83.46 16.64 134.38 CAMA CAMA CAMA CAMA AB-1D Deep 681567.96 1417702.65 777.09 2.40 PVC 6.0 93.40 98.40 99.90 CAMA AB-1S Shallow 681562.00 1417700.48 777.27 2.71 PVC 2.0 8.21 23.21 23.71 CAMA AB-20D Deep 684634.94 1411519.25 892.35 3.01 PVC 6.0 142.21 147.21 147.31 CAMA AB-20S Shallow 684640.86 1411523.77 892.43 3.14 PVC 2.0 56.64 71.64 72.39 CAMA AB-21D Deep 681948.98 1414935.24 810.23 2.62 PVC 5.0 62.62 67.62 83.54 CAMA AB-21S Shallow 681953.18 1414925.09 810.66 2.71 PVC 2.0 15.71 30.71 30.71 CAMA AB-2D Deep 680479.38 1417087.65 781.44 2.96 PVC 6.0 93.96 98.96 104.06 CAMA AB-2S Shallow 680484.01 1417091.23 781.30 2.72 PVC 2.0 19.72 34.72 34.72 CAMA AB-31) Deep 680532.62 1415467.17 815.03 2.89 PVC 5.0 132.90 137.90 143.89 CAMA AB-3S Shallow 680539.34 1415469.71 815.08 3.08 PVC 2.0 11.08 26.08 26.58 CAMA AB-4D Deep 681015.22 1415006.25 810.01 2.84 PVC 5.0 74.34 79.34 87.44 CAMA AB-4S Shallow 681009.41 1415022.53 809.73 2.30 PVC 2.0 8.30 23.30 26.80 CAMA AB-4SL Shallow 681011.27 1415014.27 809.85 2.51 PVC 2.0 41.01 51.01 57.51 CAMA AB-5BR Bedrock 680719.35 1414280.82 807.55 3.10 PVC 6.0 108.10 113.10 125.60 CAMA AB-5D Deep 680714.03 1414278.89 807.52 3.05 PVC 6.0 81.05 86.05 88.05 CAMA AB-55 AB-6BR AB-6D AB-65 AB-71) Shallow Bedrock Deep Shallow Deep 680708.77 682246.45 682239.65 682232.33 682818.72 1414277.38 1412848.99 1412851.32 1412854.25 1413214.92 807.50 835.77 835.36 835.38 834.13 2.94 2.93 2.46 2.61 2.92 PVC PVC PVC PVC PVC 2.0 6.0 5.0 2.0 5.0 6.14 107.93 64.96 9.61 81.92 21.14 112.93 69.96 24.61 86.92 21.44 121.93 78.26 24.61 95.92 CAMA CAMA CAMA CAMA CAMA Marshall Steam Station Page 1 of 4 CSA Supplement 2 Table 1-1: Well Construction Information Monitorini- Well • AB-7S AB-81) AB-8S monitoring Well Type Shallow Deep Shallow Northing 682815.06 682836.10 682831.71 Easting 1413224.11 1414032.89 1414030.28 TOC Elevation Stick-up 834.29 800.50 800.33 Casing 2.86 3.00 2.91 Casing Type PVC PVC PVC Casing Diameter 2.0 5.0 2.0 Top. Bottom Screen 7.86 98.00 5.91 Screen 22.86 103.00 15.91 Depth 23.86 104.30 17.94 CAMA CAMA CAMA AB-9BR Bedrock 683043.55 1415269.85 797.64 2.70 PVC 4.0 80.70 85.70 112.80 CAMA AB-9D Deep 683050.64 1415263.19 797.26 2.50 PVC 5.0 50.50 55.50 63.00 CAMA AB-9S Shallow 683044.02 1415261.07 797.78 2.40 PVC 2.0 5.40 15.40 15.40 CAMA AL-1D Deep 683144.37 1417007.50 817.94 2.89 PVC 5.0 82.49 87.49 92.29 CAMA AL -IS Shallow 683157.68 1417002.90 817.97 3.04 PVC 2.0 34.54 49.54 50.34 CAMA AL-21311 Bedrock 684615.63 1414830.04 915.10 2.32 PVC 6.0 205.92 210.92 230.82 CAMA AL-21) Deep 684620.72 1414826.75 915.33 2.50 PVC 6.0 154.50 159.50 164.50 CAMA AL-2S AL-31) AL-3S AL-41) BG-1BR BG-1D Shallow Deep Shallow Deep Bedrock Deep 684610.22 685495.15 685501.12 685149.26 687812.80 687818.48 1414833.97 1415062.57 1415062.23 1414565.27 1419851.83 1419859.84 915.41 918.69 918.59 918.44 817.94 817.63 2.88 2.70 2.82 2.43 3.09 2.88 PVC PVC PVC PVC PVC PVC 2.0 6.0 2.0 6.0 6.0 6.0 114.88 181.20 100.02 150.83 87.09 37.88 129.88 186.20 120.02 155.83 92.09 42.88 130.18 189.70 120.42 159.83 94.09 45.28 CAMA CAMA CAMA CAMA CAMA CAMA BG-1S Shallow 687816.43 1419863.84 817.35 2.56 PVC 2.0 10.06 20.06 20.06 CAMA BG-2BR Bedrock 686181.35 1418418.84 814.81 2.82 PVC 6.0 52.82 57.82 63.45 CAMA BG-2S Shallow 686177.84 1418417.96 814.33 2.51 PVC 2.0 9.51 19.51 19.53 CAMA BG-3BR Bedrock 686843.40 1418979.67 867.69 2.97 PVC 6.0 107.97 112.97 113.97 CAMA BG-3D Deep 686842.13 1419003.32 864.18 2.62 PVC 6.0 61.62 66.62 73.03 CAMA BG-3S Shallow 686842.99 1419015.34 863.03 2.28 PVC 2.0 24.48 34.48 42.09 CAMA GWA-10D Deep 683550.78 1417401.67 778.10 2.84 PVC 6.0 116.14 121.14 122.84 CAMA GWA-10S GWA-11D GWA-115 GWA-12BR Shallow_ Deep Shallow Bedrock 683558.12 682800.44 682793.57 682081.55 1417398.84 1417422.52 1417401.58 1410362.43 777.65 811.24 812.55 875.65 2.34 3.00 2.96 -0.37 PVC PVC PVC PVC 2.0 6.0 2.0 6.0 7.34 112.80 42.76 112.63 22.34 117.80 57.76 117.63 23.34 129.00 78.96 147.63 CAMA CAMA CAMA CAMA GWA-12D Deep 682092.53 1410359.68 875.83 -0.46 PVC 6.0 87.54 92.54 108.54 CAMA GWA-12S Shallow 682077.92 1410362.36 875.46 -0.54 PVC 2.0 9.46 24.46 25.06 CAMA GWA-13D Deep 683383.12 1410266.56 888.16 -0.18 PVC 6.0 133.32 138.32 198.82 CAMA GWA-13S Shallow 683379.30 1410275.40 887.87 -0.14 PVC 2.0 14.36 29.36 31.06 CAMA GWA-1BR Bedrock 679326.85 1416338.18 806.10 2.95 PVC 6.0 154.45 159.45 159.95 CAMA GWA-11) Deep 679331.07 1416339.79 806.05 2.78 PVC 6.0 121.78 126.78 127.28 CAMA GWA-1S Shallow 679336.11 1416341.98 805.97 2.81 PVC 2.0 40.81 55.81 55.81 CAMA GWA-21) Deep 679252.88 1414089.34 826.69 2.93 PVC 5.0 80.93 85.93 103.93 CAMA GWA-2S Shallow 679246.18 1414091.25 826.97 3.06 PVC 2.0 16.56 31.56 50.06 CAMA GWA-3D Deep 685962.19 1411086.36 839.44 2.96 PVC 5.0 38.96 43.96 54.16 CAMA GWA-3S Shallow 685961.42 1411080.72 839.24 2.82 PVC 2.0 5.82 15.82 18.02 CAMA GWA-41) Deep 686783.39 1411776.91 902.45 3.07 PVC 5.0 84.07 89.07 90.07 CAMA GWA-4S Shallow 686776.57 1411777.34 901.97 2.99 PVC 2.0 52.19 67.19 67.99 CAMA GWA-51) Deep 686811.16 1415693.60 847.17 2.81 PVC 5.0 46.31 51.31 52.31 CAMA GWA-5S Shallow 686815.49 1415696.44 847.22 2.92 PVC 2.0 27.42 37.42 37.42 CAMA GWA-61) Deep 686115.40 1416996.20 845.72 2.40 PVC 6.0 104.40 109.40 117.91 CAMA Marshall Steam Station Page 2 of 4 CSA Supplement 2 Table 1-1: Well Construction Information Monitorini- Well ID GWA-6S monitoring Well Type Shallow Northing 686100.74 Easting 1416987.88 TOC Casing Elevation Stick-up 845.37 2.38 Casing Type PVC Casing Diameter 2.0 p of Bottom Screen 40.08 Screen 50.08 Depth 52.88 CAMA GWA-71) GWA-7S GWA-81) Deep Shallow Deep 684227.62 684231.64 687478.91 1416711.93 1416725.60 1415906.06 812.50 810.72 853.68 2.95 2.92 3.09 PVC PVC PVC 6.0 2.0 5.0 28.45 11.92 59.09 33.45 21.92 64.09 37.99 21.92 64.29 CAMA CAMA CAMA GWA-8S Shallow 687474.71 1415902.00 852.90 3.15 PVC 2.0 26.15 41.15 41.15 CAMA GWA-9BR Bedrock 685030.13 1410459.13 848.45 2.92 PVC 6.0 86.92 91.92 110.00 CAMA MS-10 Shallow 681027.60 1411623.00 851.29 3.00 PVC 2.0 16.34 26.34 23.34 Landfill MS-11 Shallow 680297.50 1411565.00 859.78 2.91 PVC 2.0 35.63 45.63 42.72 Landfill MS-12 Shallow 679540.10 1412087.00 835.66 2.96 PVC 2.0 24.05 34.05 31.09 Landfill MS-13 Shallow 679732.80 1412501.00 841.90 2.71 PVC 2.0 34.23 44.23 41.52 Landfill MS-14 Shallow 679968.40 1413124.00 844.07 2.80 PVC 2.0 37.18 47.18 44.38 Landfill MS-15 Shallow 680428.00 1412428.00 861.47 3.05 PVC 2.0 56.13 66.13 63.08 Landfill MS-16 Deep 681142.30 1412485.00 836.98 2.73 PVC 2.0 30.19 40.19 37.46 Landfill MS-8 Shallow 681496.00 1412015.00 872.34 2.99 PVC 2.0 44.57 54.57 51.58 Landfill MS-9 Shallow 681384.50 1412182.00 868.04 2.68 PVC 2.0 45.68 55.68 53.00 Landfill MW-1 Shallow 682767.00 1417125.00 823.70 2.50 PVC 2.0 69.60 79.60 78.75 Landfill MW-101) Deep 681327.00 1418119.00 772.04 2.04 PVC 2.0 84.51 89.51 87.47 NPDES MW-10S Shallow 681328.00 1418114.00 772.05 2.31 PVC 2.0 16.52 31.52 29.21 NPDES MW-11D Deep 682060.00 1411710.00 884.67 2.72 PVC 2.0 90.82 95.82 93.10 NPDES MW-11S Shallow 682062.00 1411706.00 884.99 2.98 PVC 2.0 42.10 57.10 54.12 NPDES MW-12D Deep 683409.00 1410712.00 871.88 2.87 PVC 2.0 96.17 101.17 98.30 NPDES MW-12S Shallow 683414.00 1410714.00 871.86 2.84 PVC 2.0 12.94 27.94 25.10 NPDES MW-13D Deep 685017.00 1410464.00 847.05 2.61 PVC 2.0 46.16 51.16 48.55 NPDES MW-13S Shallow 685021.00 1410462.00 847.49 2.59 PVC 2.0 8.47 23.47 20.88 NPDES MW-14BR Bedrock 683634.61 1416992.14 810.49 2.84 PVC 5.0 101.84 106.84 107.84 CAMA MW-14D Deep 683626.00 1416999.00 811.43 2.76 PVC 2.0 60.36 65.36 62.60 NPDES MW-14S MW-2 MW-3 MW-4 Shallow Shallow Shallow Shallow 683629.00 683834.00 685991.00 686658.00 1416995.00 1415046.00 1415309.00 1414395.00 811.29 797.21 813.07 867.15 3.06 2.31 2.07 2.65 PVC PVC PVC PVC 2.0 2.0 2.0 2.0 34.93 25.31 17.97 40.05 49.93 35.31 27.97 50.05 46.87 35.10 28.15 50.20 NPDES Landfill Landfill Landfill MW-4 Shallow 686723.00 1414467.00 866.42 2.67 PVC 2.0 42.87 52.87 50.20 NPDES MW-4D Deep 686715.00 1414462.00 866.74 3.37 PVC 2.0 62.47 67.55 64.18 NPDES MW-5 Shallow 684782.00 1415744.00 822.69 2.50 PVC 2.0 20.50 30.50 30.71 Landfill MW-61) Deep 682253.00 1417831.00 791.19 3.04 PVC 2.0 85.57 90.57 87.53 Voluntary MW-6S Shallow 682250.00 1417836.00 790.35 2.89 PVC 2.0 17.77 27.77 24.88 Voluntary MW-71) Deep 681379.00 1417631.00 776.85 3.95 PVC 2.0 65.39 70.39 66.44 Voluntary Marshall Steam Station Page 3 of 4 CSA Supplement 2 Table 1-1: Well Construction Information Monitoring ID MW-7S Monitoring Well Type Shallow Northing 681375.00 Easting 1417629.00 TOC Elevation Stick-up 775.99 Casing 2.89 Casing Type PVC Casing Diameter 2.0 op of Bottom Screen 13.49 of Screen 23.49 Total DepthWell 20.60 Program Voluntary MW-81) Deep 680944.00 1417513.00 775.18 3.84 PVC 2.0 96.54 101.54 97.70 Voluntary MW-8S Shallow 680948.00 1417509.00 775.34 3.80 PVC 2.0 20.92 30.92 27.12 Voluntary MW-91) Deep 680637.00 1417358.00 777.38 3.04 PVC 2.0 93.24 98.24 95.20 Voluntary MW-9S Shallow 680639.00 1417349.00 777.34 3.12 PVC 2.0 23.90 33.90 30.78 Voluntary OB-1(Ash Basin) Shallow 681741.34 1413327.90 850.57 2.98 PVC 2.0 58.48 72.48 72.51 CAMA OB-1(Dry Ash Landfill) Shallow 682648.00 1417081.00 825.85 2.25 PVC 2.0 55.45 65.45 65.50 Landfill OB-2 (MW-6) Shallow 685227.10 1414675.00 919.65 2.47 PVC 2.0 104.97 119.97 122.14 Landfill OB-3 (MW-7) Shallow 685380.10 1414418.00 859.16 2.60 PVC 2.0 41.60 56.60 57.25 Landfill 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. Marshall Steam Station Page 4 of 4 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 10 250 250 10 Units: °C mV µQ/cm mg/L SU mg/L mg/L mg/L mg/L µg/L Well ID Sample Date Temperature ORP Specific Conductivity DO pH (Field) TDS Nitrate Chloride Sulfate Arsenic MW-4 11/8/2007 14.16 - 43.2 - 5.65 37 0.12 1.92 0.13 <2 MW-4 2/12/2008 14.26 48.2 - 5.86 10 0.08 1.9 0.11 <2 MW-4 8/28/2008 16.69 - 59.2 - 5.79 48 0.11 1.8 0.11 <2 MW-4 2/16/2009 13.59 - 41.3 - 6 24 0.12 2 0.15 <2 MW-4 8/10/2009 17.28 - 47.3 - 5.64 52 <0.23 1.6 0.1 <1 MW-4 2/8/2010 13.24 47.2 - 6.25 <20 0.09 1.9 0.14 <1 MW-4 2/7/2011 13.27 - 44 - 6.03 54 <0.1 1.8 0.14 <1 MW-4 6/1/2011 16.95 48 - 5.82 46 0.08 1.9 0.16 <1 MW-4 10/5/2011 15.21 -- 49.1 -- 5.86 63 0.18 1.7 0.25 <1 MW-4 2/8/2012 14.94 410 45 6.81 5.52 63 0.08 1.8 0.2 <1 MW-4 6/6/2012 16.77 396 44 6.89 5.73 55 0.07 1.8 0.16 <1 MW-4 10/4/2012 16.08 416 49 7.13 5.63 46 0.13 1.6 0.2 <1 MW-4 2/6/2013 16.21 389 46 9.12 5.89 48 0.05 1.8 0.12 <1 MW-4 6/5/2013 16.57 394 46 8.38 5.84 46 0.05 1.9 0.23 <1 MW-4 10/1/2013 17.04 376 45 7.88 5.86 55 0.04 1.8 0.13 <1 MW-4 2/6/2014 14.3 385 46 8.3 5.65 43 0.03 2 0.13 <1 MW-4 6/4/2014 16.21 379 46 8.08 5.53 46 <0.023 2 0.11 <1 MW-4 10/8/2014 16.26 360 45 7.58 5.73 50 <0.023 2.1 0.12 <1 MW-4 2/4/2015 14.45 370 46 7.64 5.43 46 <0.023 2 0.11 <1 MW-4 6/8/2015 16.34 408 46 8.63 5.73 53 <0.023 2 0.11 <1 MW-4 9/30/2015 22.52 -96.1 51 5.34 5.47 -- -- -- -- -- MW-4 10/6/2015 16.41 432 50 8.59 5.91 53 <0.023 1.9 0.11 <1 MW-4 12/11/2015 14.3 254 44 5.38 5.91 -- -- -- -- -- MW-4 2/4/2016 15.47 378 47 8.04 5.83 52 0.03 0.92 0.11 <1 MW-4 6/1/2016 16.02 347 45 8.1 5.72 -- -- -- -- -- MW-41) 11/8/2007 14.59 -- 75.2 -- 5.88 69 0.02 1.4 1.19 <2 MW-41) 2/12/2008 14.52 -- 78.5 -- 6.1 41 0.02 1.5 1 <2 MW-41) 8/28/2008 15.91 - 76.5 - 5.92 72 0.02 1.4 0.98 <2 MW-41) 2/16/2009 14.52 -- 69.3 -- 6.07 72 <0.23 1.6 1.4 <2 MW-41) 8/10/2009 16.23 - 75.7 - 5.96 78 <0.23 1.3 1 <1 MW-41) 2/8/2010 14.21 -- 78.8 -- 6.46 42 0.04 1.6 1.2 <1 MW-41) 2/7/2011 13.94 - 73 - 6.22 82 <0.1 1.5 1.2 <1 MW-41) 6/1/2011 16.68 -- 77 -- 6.07 58 0.04 1.6 1.3 <1 MW-41) 10/5/2011 15.17 -- 76 -- 6.16 88 0.03 1.3 1.2 <1 MW-41) 2/8/2012 14.85 378 76 6.04 6.09 95 0.03 1.5 1.4 <1 MW-41) 6/6/2012 15.87 383 74 5.92 6.01 73 <0.023 1.5 1.3 <1 MW-41) 10/4/2012 15.87 411 75 5.98 6.08 76 <0.023 1.3 1.2 <1 MW-41) 2/6/2013 15.67 387 75 5.99 6.02 84 <0.023 1.4 1.3 <1 MW-41) 6/5/2013 15.87 391 77 5.75 5.98 83 <0.023 1.4 1.4 <1 MW-41) 10/1/2013 15.93 369 77 5.47 6.08 85 0.03 1.4 1.3 <1 MW-41) 2/6/2014 15.35 375 76 5.66 6.03 73 0.03 1.6 1.4 <1 MW-41) 6/4/2014 16 386 79 5.54 5.88 83 <0.023 1.5 1.4 <1 MW-41) 10/8/2014 15.88 354 77 5.91 6.08 79 <0.023 1.6 1.4 <1 MW-41) 2/4/2015 15.49 349 77 5.87 5.96 73 <0.023 1.5 1.4 <1 MW-41) 6/8/2015 15.86 406 77 6.02 5.94 87 <0.023 1.5 1.4 <1 MW-41) 9/30/2015 21.13 -98.2 81 8.14 5.91 -- -- -- -- -- MW-41) 10/6/2015 15.93 494 80 6.03 6.14 75 <0.023 1.4 1.4 <1 MW-41) 12/11/2015 13.6 208.2 63.2 5.82 6.31 -- -- -- -- -- MW-41) 2/4/2016 15.69 376 80 5.73 6.16 77 0.03 0.65 1.6 <1 MW-41) 6/1/2016 15.81 336 77 5.81 6.15 -- -- -- -- -- MW-6S 11/8/2007 18.78 -- 136.3 -- 4.68 -- -- -- -- -- MW-6S 8/28/2008 18.75 - 180.5 - 4.38 110 0.02 24 30 <2 MW-6S 2/16/2009 13.52 -- 535 - 4.02 202 <0.23 140 16 <2 MW-6S 8/10/2009 18.62 - 778 - 3.94 366 0.09 210 14 1.9 MW-6S 2/8/2010 15.27 -- 802 - 4.42 364 0.03 220 12 1.8 MW-61) 11/8/2007 17.09 - 115 - 6.18 97 <0.02 3.89 8.54 <2 Marshall Steam Station Page 1 of 15 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 10 250 250 10 Units: °C mV µQ/cm mg/L SU mg/L mg/L mg/L mg/L µg/L Sample Date Temperaturds, ORP Specific Conductivity D• pH (Field) TDS Nitrate Chloride Sulfate Arsenic MW-6D 2/12/2008 15.97 - 113 - 6.15 45 <0.02 3.9 8 <2 MW-61) 8/28/2008 17.25 113.2 - 6.06 86 <0.02 4 8.5 <2 MW-61) 2/16/2009 15.23 -- 115 - 6.15 64 <0.23 3.6 7.7 <2 MW-61) 8/10/2009 17.91 116 - 6.04 110 <0.02 4 9.3 <1 MW-61) 2/8/2010 16.33 -- 116 - 6.42 74 <0.02 4.4 9.4 <1 MW-7S 11/8/2007 17.04 202.1 4.86 106 0.27 17.88 52.19 <2 MW-7S 2/12/2008 14.35 - 541 4.4 240 0.27 120 38 <2 MW-7S 8/28/2008 20.79 1160 4.22 1160 0.25 310 18 <2 MW-7S 2/16/2009 14.9 - 1922 4.1 926 0.33 520 37 <2 MW-7S 8/10/2009 20.3 1333 4.2 1080 0.41 360 77 6 MW-75 2/8/2010 14.18 - 1550 4.45 1030 0.76 390 130 5.3 MW-71) 11/8/2007 15.41 473.2 - 7.32 350 <0.02 4.5 134.13 <2 MW-71) 2/12/2008 14.68 - 466 - 7.3 300 <0.02 4.6 120 <2 MW-71) 8/28/2008 17.01 461.7 - 7.37 350 <0.02 4.8 110 <2 MW-71) 2/16/2009 14.53 - 456 - 7.37 312 <0.23 4.2 120 <2 MW-71) 8/10/2009 17.66 454 7.36 342 <0.02 4.4 120 <1 MW-71) 2/8/2010 15.21 - 457 7.6 308 <0.02 5 120 <1 MW-8S 11/8/2007 16.83 592 6.33 278 <0.02 5.66 20.69 <2 MW-8S 2/12/2008 16.1 - 381 6.25 140 <0.02 <0.1 8.6 <2 MW-8S 8/28/2008 17.27 875 6.34 376 <0.02 1.3 36 <2 MW-8S 2/16/2009 16.9 - 985 6.53 500 <0.23 5.6 67 <2 MW-8S 8/10/2009 17.65 947 - 6.54 536 <0.02 5.4 81 <1 MW-85 2/8/2010 15.64 - 927 - 6.79 550 0.21 3.4 78 <1 MW-81) 11/8/2007 16.11 517.8 - 6.77 366 <0.02 5.15 122.32 <2 MW-81) 2/12/2008 15.13 - 510 - 6.78 330 <0.02 5.1 120 <2 MW-81) 8/28/2008 16.9 - 519 - 6.67 358 <0.02 5.3 110 <2 MW-81) 2/16/2009 17.15 - 502 - 6.75 356 <0.23 4.5 110 <2 MW-81) 8/10/2009 17.73 517 - 6.75 380 <0.02 4.8 130 <1 MW-81) 2/8/2010 15.52 - 520 - 6.95 358 <0.02 5.5 120 <1 MW-9S 11/8/2007 16.87 526.4 - 6.65 327 <0.02 8.57 66.01 <2 MW-9S 2/12/2008 15.64 - 502.8 - 6.77 280 <0.02 9.9 54 <2 MW-9S 8/28/2008 17.14 504.1 - 6.74 290 0.05 7.8 52 <2 MW-9S 2/16/2009 15.88 - 509 - 6.77 290 <0.23 8.4 55 <2 MW-9S 8/10/2009 19 514 - 6.75 318 0.05 8.6 57 <1 MW-9S 2/8/2010 14.67 - 509 - 6.99 312 0.19 11 52 <1 MW-91) 11/8/2007 16.04 294.3 - 5.62 217 <0.02 6.17 96.75 <2 MW-91) 2/12/2008 15.28 - 310.2 5.78 180 <0.02 6.3 100 <2 MW-91) 8/28/2008 16.48 315.2 5.73 216 0.02 6.1 94 <2 MW-91) 2/16/2009 16.1 - 322 - 5.75 220 <0.23 5 100 <2 MW-91) 8/10/2009 17.62 332 - 5.79 236 <0.02 5.6 110 <1 MW-91) 2/8/2010 15.1 - 346 - 5.99 260 <0.02 6.2 120 <1 MW-10S 2/7/2011 14.01 18 - 5.66 21 <0.1 0.99 0.16 <1 MW-10S 6/1/2011 15.63 - 20 - 5.28 <10 0.05 1 0.17 <1 MW-10S 10/5/2011 15.03 -- 18 -- 5.44 25 0.03 0.91 0.14 <1 MW-10S 2/8/2012 14.56 407 19 7.48 5.56 35 <0.02 0.97 0.13 <1 MW-10S 6/6/2012 14.98 413 17 8.6 5.18 <25 <0.023 1 0.13 <1 MW-10S 10/4/2012 15.63 470 16 8.59 5.36 17 <0.023 1 0.14 <1 MW-10S 2/7/2013 14.06 423 17 6.58 5.1 14 <0.023 1.1 0.15 <1 MW-10S 6/5/2013 15.69 417 15 6.83 5.23 <25 <0.023 1.1 0.12 <1 MW-10S 10/1/2013 16.76 385 17 7.92 5.21 <25 0.03 0.93 0.11 <1 MW-10S 2/6/2014 14.31 415 17 5.29 5.14 <25 <0.023 1.2 0.14 <1 MW-10S 6/4/2014 15.79 376 17 7.27 5.14 <25 <0.023 1.1 0.11 <1 MW-10S 10/8/2014 15.3 380 17 8.15 5.14 <25 <0.023 1.1 <0.1 <1 MW-10S 2/4/2015 14.66 382 17 6.23 5.06 <25 <0.023 0.99 <0.1 <1 MW-10S 6/8/2015 15.07 450 15 7.75 5.2 <25 <0.023 1 0.12 <1 MW-10S 10/6/2015 15.33 464 18 8.35 5.24 <25 0.02 0.93 <0.1 <1 Marshall Steam Station Page 2 of 15 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 10 250 250 10 Units: °C mV µQ/cm mg/L SU mg/L mg/L mg/L mg/L µg/L INK I =- Sample Date Temperature ORP Specific Conductivity D• pH (Field) TDS Nitrate Chloride Sulfate Arsenic MW-10S 2/4/2016 15.01 415 16 6.48 5.25 <25 <0.023 0.66 0.11 <1 MW-10S 6/1/2016 15.6 345 17 7.94 5.22 -- -- -- -- -- MW-10D 2/7/2011 14.25 -- 68 -- 6.68 80 0.29 1.5 5.4 <1 MW-10D 6/1/2011 16.06 - 70 - 6.18 72 0.46 1.6 5.6 <1 MW-10D 10/5/2011 15.25 -- 64 -- 6.48 89 0.39 1.5 3.9 <1 MW-10D 2/8/2012 15.04 350 62 5.44 6.54 83 0.39 1.5 3.3 <1 MW-10D 6/6/2012 15.36 352 60 5.74 6.34 77 0.36 1.4 3 <1 MW-10D 10/4/2012 15.58 389 59 5.51 6.34 71 0.36 1.4 2.8 <1 MW-10D 2/7/2013 14.6 367 59 3.93 6.33 74 0.37 1.4 3.2 <1 MW-10D 6/5/2013 15.74 374 58 2.68 6.32 81 0.34 1.4 3.1 <1 MW-10D 10/1/2013 16.36 337 57 2.85 6.36 82 0.33 1.3 3 <1 MW-10D 2/6/2014 14.37 354 58 4.75 6.3 68 0.37 1.5 2.8 <1 MW-10D 6/4/2014 15.83 341 60 5.23 6.25 79 0.35 1.4 2.9 <1 MW-10D 10/8/2014 15.54 337 59 4.07 6.3 74 0.36 1.5 3.4 <1 MW-10D 2/4/2015 15.03 337 59 4.53 6.17 65 0.36 1.4 3.2 <1 MW-10D 6/8/2015 15.58 385 58 4.62 6.31 86 0.36 1.4 3.3 <1 MW-10D 10/6/2015 15.6 395 62 4.71 6.38 68 0.38 1.4 3.9 <1 MW-10D 2/4/2016 15.27 369 59 5.2 6.39 72 0.35 0.42 3.6 <1 MW-10D 6/1/2016 15.63 329 58 5.01 6.27 -- -- -- -- -- MW-11S 2/7/2011 14.77 -- 34 -- 6.38 47 0.46 2.8 0.41 <1 MW-11S 6/1/2011 16.49 - 37 - 6.11 29 0.64 2.7 0.44 <1 MW-11S 10/5/2011 15.92 -- 37 -- 6.28 62 0.5 2.6 0.47 <1 MW-11S 2/8/2012 13.98 366 37 7.37 6.29 52 0.5 2.6 0.43 <1 MW-11S 6/6/2012 16.97 388 37 6.74 6.03 49 0.49 2.5 0.39 <1 MW-11S 10/4/2012 16.31 419 37 6.98 6.09 53 0.49 2.5 0.4 <1 MW-11S 2/6/2013 15.51 379 37 7.42 6.06 47 0.53 2.6 0.41 <1 MW-11S 6/5/2013 16.49 392 38 7.31 5.94 47 0.54 2.5 0.43 <1 MW-11S 10/1/2013 16.88 366 40 7.09 6.08 48 0.52 2.5 0.38 <1 MW-11S 2/6/2014 13.71 364 40 7.56 5.99 44 0.56 2.7 0.39 <1 MW-11S 6/4/2014 17.08 378 42 7.87 5.95 46 0.54 2.6 0.37 <1 MW-11S 10/8/2014 15.94 374 45 7.22 5.72 46 0.61 2.9 0.36 <1 MW-11S 2/4/2015 15.27 409 45 7.4 5.78 39 0.57 2.6 0.34 <1 MW-11S 6/8/2015 16.19 376 48 7.29 6.05 51 0.58 2.7 0.36 <1 MW-11S 10/7/2015 16.21 576 51 7.18 5.82 42 0.58 2.7 0.38 <1 MW-11S 2/4/2016 15.53 457 37 7.42 5.86 41 0.55 0.93 0.33 <1 MW-11S 6/1/2016 16.16 439 53 7.16 5.98 -- -- -- -- -- MW-11D 2/7/2011 14.65 -- 81 -- 7.51 92 0.13 2.3 6 <1 MW-11D 6/1/2011 17.74 - 88 - 6.89 64 0.27 2.2 7.9 <1 MW-11D 10/5/2011 15.89 -- 70 -- 6.98 98 0.26 2.2 6.9 <1 MW-11D 2/8/2012 14.24 323 71 5 7.1 95 0.25 2.2 7.5 <1 MW-11D 6/6/2012 16.03 353 70 5.24 6.95 80 0.25 2.1 4.9 <1 MW-11D 10/4/2012 16.24 390 60 5.63 6.9 77 0.24 2.1 3.3 <1 MW-11D 2/6/2013 15.6 342 59 6.51 6.86 73 0.27 2.1 2.7 <1 MW-11D 6/5/2013 16.21 361 53 6.01 6.65 73 0.29 2.1 1.1 <1 MW-11D 10/1/2013 16.6 340 55 5.81 6.74 73 0.27 2 0.88 <1 MW-11D 2/6/2014 14.17 327 53 6.69 6.61 69 0.26 2.2 1.7 <1 MW-11D 6/4/2014 17.03 347 53 6.69 6.69 75 0.26 2 1.3 <1 MW-11D 10/8/2014 16.11 330 47 6.59 6.67 68 0.3 2.2 1.3 <1 MW-11D 2/4/2015 14.95 367 51 7.01 6.6 57 0.29 2 0.64 <1 MW-11D 6/8/2015 16.67 337 54 7.26 6.88 74 0.31 2.1 0.61 <1 MW-11D 10/7/2015 16.47 468 53 7 6.85 69 0.33 2.2 0.86 <1 MW-11D 2/4/2016 15.41 435 47 6.1 6.83 79 0.27 0.6 1.3 <1 MW-11D 6/1/2016 16.32 398 56 5.8 6.81 -- -- -- -- -- MW-12S 2/7/2011 13.61 -- 20.8 -- 5.19 24 <0.1 1.5 0.97 <1 MW-12S 6/1/2011 16.03 -- 19.1 - 5.26 <10 0.03 1.4 1 <1 MW-12S 10/5/2011 15.44 - 23.9 - 5.66 44 0.04 1.1 1.2 <1 Marshall Steam Station Page 3 of 15 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 10 250 250 10 Units: °C mV µQ/cm mg/L SU mg/L mg/L mg/L mg/L µg/L Date Temperature ORP Specific Conductivity D• pH (Field) TDS Nitrate Chloride Sulfate Arsenic MW-12S 2/8/2012 13.8 443 23 7.1 5.21 25 <0.02 1.7 0.94 <1 MW-12S 6/6/2012 14.74 457 17 7.77 5.07 <25 <0.023 1.5 0.83 <1 MW-12S 10/4/2012 15.74 416 23 8.46 5.69 30 0.02 1.2 1.1 <1 MW-12S 2/6/2013 13.54 427 18 7.59 5.35 21 <0.023 1.5 0.75 <1 MW-12S 6/5/2013 15.96 438 16 7.9 4.89 <25 <0.023 1.6 0.76 <1 MW-12S 10/1/2013 15.86 398 21 7.87 5.49 32 <0.023 1.2 0.84 <1 MW-12S 2/6/2014 13.04 444 17 7.59 4.96 <25 <0.023 1.9 0.33 <1 MW-12S 6/4/2014 15.27 432 16 8.39 5.11 25 <0.023 1.3 0.74 <1 MW-12S 10/8/2014 15.85 356 24 8.46 5.72 30 <0.023 1.3 1.1 <1 MW-12S 2/4/2015 12.4 438 20 7.09 5.11 <25 <0.023 1.6 0.7 <1 MW-12S 6/8/2015 15.57 408 20 8.34 5.35 26 <0.023 1.4 0.83 <1 MW-12S 10/6/2015 14.79 394 27 8.1 5.78 36 <0.023 1.1 1 <1 MW-12S 2/4/2016 14.15 466 13 7.63 5.04 <25 <0.023 0.71 0.55 <1 MW-12S 6/1/2016 15.08 483 19 7.43 5.01 -- -- -- -- -- MW-12D 2/7/2011 14.58 -- 72.1 -- 5.89 82 <0.1 1.1 7.7 <1 MW-12D 6/1/2011 15.91 - 71.4 - 6.26 70 <0.023 1.1 8.2 <1 MW-12D 10/5/2011 15.55 -- 71.7 -- 6.37 100 <0.023 1.1 8.4 <1 MW-12D 2/8/2012 14.78 377 68 3.08 6.35 95 <0.02 1.1 7.4 <1 MW-12D 6/6/2012 15.21 388 68 3.13 6.34 81 <0.023 1.1 6.5 <1 MW-12D 10/4/2012 15.41 379 67 3.04 6.26 85 <0.023 1.1 7.4 <1 MW-12D 2/6/2013 15.14 363 66 3.25 6.25 85 <0.023 1.1 7.5 <1 MW-12D 6/5/2013 15.34 387 65 3.99 6.02 85 <0.023 1.1 7 <1 MW-12D 10/1/2013 15.42 352 67 2.76 6.24 82 <0.023 1 7 <1 MW-12D 2/6/2014 14.88 345 65 3.2 6.2 75 <0.023 1.2 7.6 <1 MW-12D 6/4/2014 15.44 394 65 3.09 6.14 82 <0.023 1.1 7.6 <1 MW-12D 10/8/2014 15.32 351 63 3.17 6.24 79 <0.023 1.2 7.2 <1 MW-12D 2/4/2015 14.98 367 66 3.15 6.06 62 <0.023 1.1 7 <1 MW-12D 6/8/2015 15.4 373 68 3.18 6.3 87 <0.023 1.1 7 <1 MW-12D 10/6/2015 15.33 422 67 3.04 6.33 76 <0.023 1 7.7 <1 MW-12D 2/4/2016 14.93 437 60 2.46 6.16 80 <0.023 0.35 7.5 <1 MW-12D 6/1/2016 15.47 417 67 3.21 6.31 -- -- -- -- -- MW-13S 2/7/2011 13.47 -- 84 -- 6.14 95 1.5 4.6 0.66 <1 MW-13S 6/1/2011 14.88 -- 96.6 - 6.18 63 2.1 4.7 0.54 <1 MW-13S 10/5/2011 16.26 -- 86.5 -- 5.83 100 1.5 4.8 0.57 <1 MW-13S 2/8/2012 12.49 380 87 6.74 6.27 97 1.6 4.8 0.55 <1 MW-13S 6/6/2012 14.76 394 84 6.63 6.26 84 1.4 4.3 0.49 <1 MW-13S 10/4/2012 16.94 386 87 6.6 6.14 99 1.3 4.8 0.5 <1 MW-13S 2/6/2013 12.87 375 85 6.74 6.32 96 1.4 4.5 0.48 <1 MW-13S 6/5/2013 15.7 396 85 6.82 5.76 96 1.5 4.3 0.52 <1 MW-13S 10/1/2013 16.32 370 88 6.41 6.07 89 1.4 4.3 0.46 <1 MW-13S 2/6/2014 11.48 344 85 7.46 6.26 80 1.5 4.7 0.5 <1 MW-13S 6/4/2014 15.08 371 87 7.1 6.01 91 1.5 4.3 0.47 <1 MW-13S 10/8/2014 16.68 341 88 6.94 6.26 92 1.6 4.6 0.49 <1 MW-13S 2/4/2015 7.77 341 87 7.71 6.08 78 1.5 4.4 0.48 <1 MW-13S 6/8/2015 14.78 362 79 7.74 6.28 89 1.5 4.5 0.47 <1 MW-13S 10/6/2015 16.61 378 93 6.18 6.15 84 1.4 4.4 1.3 <1 MW-13S 2/4/2016 14.14 471 80 6.27 6.17 95 1.3 1.4 1.4 <1 MW-13S 6/1/2016 14.65 441 90 6.54 6.28 -- -- -- -- -- MW-13D 2/7/2011 14.57 -- 88.7 -- 6.16 88 1.6 4.8 0.55 <1 MW-13D 6/1/2011 15.74 - 90.5 - 6.17 79 2.2 4.9 0.58 <1 MW-13D 10/5/2011 15.02 -- 89.3 -- 6.19 100 1.8 5 0.61 <1 MW-13D 2/8/2012 14.66 382 90 6.38 6.39 100 1.7 4.9 0.57 <1 MW-13D 6/6/2012 15.14 395 88 6.39 6.33 85 1.5 4.6 0.54 <1 MW-13D 10/4/2012 15.52 392 90 6.48 6.34 90 1.5 4.3 0.56 <1 MW-13D 2/6/2013 14.3 366 89 6.29 6.35 88 1.6 4.7 0.56 <1 MW-13D 6/5/2013 15.35 393 89 6.22 5.86 95 1.6 4.6 0.58 <1 Marshall Steam Station Page 4 of 15 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 10 250 250 10 Units: °C mV 110/cm mg/L SU mg/L mg/L mg/L mg/L µg/L Well ID Sample Date Temperature ORP SpecificD• .• Sulfate Arsenic MW-13D 10/1/2013 16.04 364 91 6.21 6.22 88 1.5 4.6 0.53 <1 MW-13D 2/6/2014 14.06 345 90 6.17 6.24 79 1.7 5 0.58 <1 MW-13D 6/4/2014 15.21 378 91 6.19 6.11 95 1.6 4.6 0.55 <1 MW-13D 10/8/2014 15.6 351 91 6.12 6.26 86 1.7 4.8 0.55 <1 MW-13D 2/4/2015 13.79 348 92 6.33 6.18 75 1.6 4.7 0.54 <1 MW-13D 6/8/2015 15.27 364 94 6.22 6.34 95 1.6 4.7 0.57 <1 MW-13D 10/6/2015 15.34 375 95 6.05 6.38 87 1.6 4.6 0.53 <1 MW-13D 2/4/2016 14.89 456 91 6.3 6.24 85 1.6 1.4 0.56 <1 MW-13D 6/1/2016 15.3 431 94 6.11 6.27 -- -- -- -- -- MW-14S 2/7/2011 14.49 -- 815.7 -- 5.15 650 0.23 4.8 400 <1 MW-14S 6/1/2011 16.34 -- 792.9 - 5.36 620 0.29 5.1 400 <1 MW-14S 10/5/2011 15.77 -- 760.8 -- 5.43 610 0.2 4.7 370 <1 MW-14S 2/8/2012 14.7 414 741 2.35 5.34 580 0.2 5.1 360 <1 MW-14S 6/6/2012 15.26 424 724 3.29 5.38 573 0.18 4.6 350 <1 MW-14S 10/4/2012 15.93 383 748 2.67 5.35 590 0.17 4.7 350 <1 MW-14S 2/7/2013 13.86 415 744 3.22 5.48 580 0.21 6 350 <1 MW-14S 6/5/2013 15.96 427 735 3.89 5.4 600 0.22 8.8 340 <1 MW-14S 10/1/2013 16.72 329 743 3.66 5.43 580 0.22 17 310 <1 MW-14S 2/6/2014 12.21 401 723 4.54 5.43 570 0.2 29 310 <1 MW-14S 6/4/2014 16.1 395 749 4.2 5.38 580 0.15 44 280 <1 MW-14S 10/8/2014 16.65 357 746 3.83 5.44 550 0.14 55 280 <1 MW-14S 2/4/2015 14.22 384 749 3.62 5.31 530 0.17 64 250 <1 MW-14S 6/8/2015 15.61 437 702 2.22 5.35 540 0.15 76 260 <1 MW-14S 10/6/2015 15.68 410 765 1.98 5.38 510 0.13 92 230 <1 MW-14S 2/4/2016 15.01 402 764 2.77 5.36 500 0.13 94 220 <1 MW-14S 6/1/2016 15.76 331 789 3.1 5.36 -- -- -- -- -- MW-14D 2/7/2011 14.22 -- 683.7 -- 5.31 540 0.14 3.3 310 <1 MW-14D 6/1/2011 16.27 674.3 - 5.56 510 0.19 3.4 310 <1 MW-14D 10/5/2011 15.81 -- 646.6 -- 5.58 510 0.14 3.1 290 <1 MW-14D 2/8/2012 14.95 394 634 0.71 5.49 510 0.14 3.4 310 <1 MW-14D 6/6/2012 15.29 415 619 1.09 5.54 494 0.13 3.2 280 <1 MW-14D 10/4/2012 15.56 350 621 0.63 5.51 490 0.12 2.7 270 <1 MW-14D 2/7/2013 14.75 408 611 0.71 5.55 480 0.14 4 270 <1 MW-14D 6/5/2013 15.76 411 594 0.81 5.48 470 0.14 5.2 250 <1 MW-14D 10/1/2013 16.03 350 597 0.72 5.5 460 0.14 7.9 240 <1 MW-14D 2/6/2014 14.48 383 578 0.74 5.49 450 0.13 12 240 <1 MW-14D 6/4/2014 15.8 381 597 0.71 5.46 450 0.1 16 230 <1 MW-14D 10/8/2014 15.76 340 591 1.35 5.55 440 0.1 23 230 <1 MW-14D 2/4/2015 14.95 373 592 0.59 5.43 440 0.12 26 210 <1 MW-14D 6/8/2015 15.43 404 594 0.46 5.55 450 0.09 33 230 <1 MW-14D 10/6/2015 15.6 396 532 0.52 5.6 410 0.1 31 200 <1 MW-14D 2/4/2016 15.25 382 534 0.61 5.58 400 0.11 9.8 180 <1 MW-14D 6/1/2016 15.41 326 571 0 5.44 -- -- -- -- -- Notes: 1. °C indicates temperature measured in degrees celsius 2. mV indicates oxidation/reduction potential measured in millivolts 3. VD/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 Marshall Steam Station Page 5 of 15 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells Well ID MW-4 NCAC 2L Standard: Units: Sample Date 11/8/2007 700 µg/L Barium 49 700 µg/L Boron <100 2 µg/L <0.5 10 µg/L 1.47 1 mg/L <0.002 300 µg/L 300 15 µg/L <2 50 µg/L 10 0.2 µg/L 100 µg/L <2 MW-4 2/12/2008 51 <100 <0.5 1.36 <0.002 87 <2 10 <2 MW-4 8/28/2008 50 <100 <0.5 1.32 <0.002 38 <2 <5 <2 MW-4 2/16/2009 47 <100 <0.5 1.39 <0.002 67 <2 <5 <2 MW-4 8/10/2009 53 <100 <1 1.3 <0.001 66 <1 <5 <1 MW-4 2/8/2010 46.7 <50 <1 1.6 <0.001 60.7 <1 <5 -- <1 MW-4 2/7/2011 48 <50 <1 <5 <0.005 128 <1 8 <0.2 <5 MW-4 6/1/2011 55 <50 <1 <5 <0.005 160 <1 9 <0.2 <5 MW-4 10/5/2011 53 <50 <1 <5 <0.005 109 <1 5 <0.2 <5 MW-4 2/8/2012 49 <50 <1 <5 <0.005 70 <1 7 <0.2 <5 MW-4 6/6/2012 50 <50 <1 <5 <0.005 180 <1 11 <0.2 <5 MW-4 10/4/2012 46 <50 <1 <5 <0.005 38 <1 5 <0.2 <5 MW-4 2/6/2013 45 <50 <1 <5 <0.005 77 <1 <5 <0.2 <5 MW-4 6/5/2013 48 <50 <1 <5 <0.005 164 <1 <5 <0.2 <5 MW-4 10/1/2013 46 <50 <1 <5 <0.005 137 <1 <5 <0.2 <5 MW-4 2/6/2014 48 <50 <1 <5 0.005 66 <1 <5 <0.2 <5 MW-4 6/4/2014 48 <50 <1 <5 <0.005 190 <1 9 <0.2 <5 MW-4 10/8/2014 53 <50 <1 <5 <0.005 782 <1 24 <0.2 <5 MW-4 2/4/2015 59 <50 <1 <5 <0.005 1380 <1 38 <0.2 <5 MW-4 6/8/2015 47 <50 <1 <5 <0.005 33 <1 <5 <0.2 <5 MW-4 9/30/2015 -- -- -- -- -- -- - MW-4 10/6/2015 49 <50 <1 <5 <0.005 148 <1 6 <0.2 <5 MW-4 12/11/2015 -- -- -- -- -- -- - MW-4 2/4/2016 51 <50 <1 <5 <0.005 292 <1 6 <0.2 <5 MW-4 6/1/2016 -- -- -- -- -- -- - MW-4D 11/8/2007 43 <100 <0.5 <1 <0.002 253 <2 37 <2 MW-41) 2/12/2008 44 <100 <0.5 <1 <0.002 52 <2 15 <2 MW-41) 8/28/2008 44 <100 <0.5 <1 <0.002 98 <2 11 <2 MW-41) 2/16/2009 41 <100 <0.5 <1 <0.002 56 <2 6 <2 MW-41) 8/10/2009 42 <100 <1 <1 <0.001 48 <1 6 <1 MW-41) 2/8/2010 39.5 <50 <1 <1 <0.001 40.1 <1 <5 -- <1 MW-41) 2/7/2011 43 <50 <1 <5 <0.005 268 <1 38 <0.2 <5 MW-41) 6/1/2011 43 <50 <1 <5 <0.005 21 <1 <5 <0.2 <5 MW-41) 10/5/2011 43 <50 <1 <5 <0.005 26 <1 <5 <0.2 <5 MW-41) 2/8/2012 46 <50 <1 <5 <0.005 376 <1 48 <0.2 <5 MW-41) 6/6/2012 43 <50 <1 <5 <0.005 88 <1 9 <0.2 <5 MW-41) 10/4/2012 41 <50 <1 <5 <0.005 41 <1 <5 <0.2 <5 MW-41) 2/6/2013 41 <50 <1 <5 <0.005 17 <1 <5 <0.2 <5 MW-41) 6/5/2013 43 <50 <1 <5 <0.005 18 <1 <5 <0.2 <5 MW-41) 10/1/2013 42 <50 <1 <5 <0.005 17 <1 <5 <0.2 <5 MW-41) 2/6/2014 42 <50 <1 <5 <0.005 16 <1 <5 <0.2 <5 MW-41) 6/4/2014 42 <50 <1 <5 <0.005 25 <1 <5 <0.2 <5 MW-41) 10/8/2014 41 <50 <1 <5 <0.005 37 <1 <5 <0.2 <5 MW-41) 2/4/2015 42 <50 <1 <5 <0.005 <10 <1 <5 <0.2 <5 MW-41) 6/8/2015 42 <50 <1 <5 <0.005 24 <1 <5 <0.2 <5 MW-41) 9/30/2015 -- -- -- -- -- -- - MW-4D 10/6/2015 46 <50 <1 <5 <0.005 405 <1 13 <0.2 <5 MW-413 12/11/2015 -- -- -- -- -- -- - MW-4D 2/4/2016 45 <50 <1 <5 <0.005 13 <1 <5 <0.2 <5 MW-41) MW-6S MW-6S MW-6S MW-6S MW-6S MW-61) 6/1/2016 11/8/2007 8/28/2008 2/16/2009 8/10/2009 2/8/2010 11/8/2007 -- -- 202 580 665 1240 58 -- -- 182 223 349 788 <100 -- -- <0.5 0.669 1.9 1.9 <0.5 -- -- <1 <1 <1 5.4 <1 -- -- 0.011 0.032 0.046 0.051 <0.002 -- -- 295 77 58 290 211 - - <2 <2 <1 1.3 <2 247 942 1630 1650 17 <2 5.09 8.3 9.4 <2 Marshall Steam Station Page 6 of 15 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 700 700 2 10 1 300 15 50 0.2 100 Units: µg/L µg/L µg/L µg/L mg/L µg/L µg/L µg/L µg/L µg/L � Boron Cadmium Chromium Copper MW-61) 2/12/2008 62 <100 <0.5 <1 0.002 296 <2 14 <2 MW-61) 8/28/2008 64 <100 <0.5 <1 0.002 482 <2 16 <2 MW-61) 2/16/2009 62 <100 <0.5 <1 <0.002 289 <2 13 <2 MW-61) 8/10/2009 63 <100 <1 <1 <0.001 227 <1 11 <1 MW-61) 2/8/2010 57.2 <50 <1 <1 <0.001 52.5 <1 5.75 <1 MW-7S 11/8/2007 65 249 <0.5 <1 <0.002 68 <2 1586 <2 MW-75 2/12/2008 169 224 0.83 <1 <0.002 19 <2 5230 <2 MW-7S 8/28/2008 641 503 1.37 <1 <0.002 183 <2 9440 3.04 MW-75 2/16/2009 417 2230 0.904 <1 0.003 80 <2 10400 2.63 MW-7S 8/10/2009 448 6460 <1 <1 <0.001 341 1.8 10200 1.3 MW-7S 2/8/2010 318 4970 <1 <1 <0.001 43.8 1 12900 2.1 MW-71) 11/8/2007 50 <100 <0.5 <1 <0.002 500 <2 443 <2 MW-71) 2/12/2008 53 <100 <0.5 <1 <0.002 506 <2 450 <2 MW-71) 8/28/2008 53 <100 <0.5 <1 <0.002 516 <2 451 <2 MW-71) 2/16/2009 51 <100 <0.5 <1 <0.002 490 <2 430 <2 MW-71) 8/10/2009 52 <100 <1 <1 <0.001 492 <1 441 <1 MW-71) 2/8/2010 50.6 <50 <1 <1 <0.001 478 <1 423 <1 MW-8S 11/8/2007 145 140 <0.5 <1 <0.002 7109 <2 4632 <2 MW-85 2/12/2008 109 <100 <0.5 <1 <0.002 8720 <2 3360 <2 MW-8S 8/28/2008 180 162 <0.5 <1 <0.002 1580 <2 4910 <2 MW-8S 2/16/2009 243 237 <0.5 <1 <0.002 1560 <2 5750 2.34 MW-8S 8/10/2009 232 222 <1 <1 <0.001 2560 <1 7720 2.5 MW-8S 2/8/2010 154 241 <1 <1 <0.001 493 <1 1160 <1 MW-81) 11/8/2007 42 203 <0.5 2.6 0.005 3462 2.66 253 <2 MW-81) 2/12/2008 35 190 <0.5 1.55 0.005 2120 2.09 218 <2 MW-81) 8/28/2008 25 198 <0.5 <1 0.002 1470 <2 208 <2 MW-81) 2/16/2009 22 208 <0.5 <1 <0.002 1130 <2 192 <2 MW-81) 8/10/2009 22 192 <1 <1 <0.001 1130 <1 208 <1 MW-81) 2/8/2010 31 200 <1 1.9 0.004 1860 1.8 222 1.4 MW-9S 11/8/2007 197 <100 <0.5 <1 <0.002 160 <2 1851 <2 MW-9S 2/12/2008 203 <100 <0.5 <1 <0.002 35 <2 295 <2 MW-9S 8/28/2008 217 <100 <0.5 <1 <0.002 63 <2 62 <2 MW-9S 2/16/2009 266 <100 <0.5 <1 <0.002 3840 <2 666 <2 MW-9S 8/10/2009 247 <100 <1 <1 <0.001 24 <1 39 <1 MW-9S 2/8/2010 225 <50 <1 <1 <0.001 17 <1 6.54 <1 MW-91) 11/8/2007 74 386 <0.5 <1 0.003 395 <2 308 3.9 MW-91) 2/12/2008 81 378 <0.5 <1 0.003 221 <2 323 3.77 MW-91) 8/28/2008 82 374 <0.5 <1 0.003 184 <2 337 3.51 MW-91) 2/16/2009 84 382 <0.5 <1 <0.002 135 <2 350 3.46 MW-91) 8/10/2009 87 385 <1 <1 0.002 86 <1 387 3.2 MW-91) 2/8/2010 87.1 389 <1 <1 0.002 67.6 <1 412 -- 3.9 MW-10S 2/7/2011 42 <50 <1 <5 <0.005 105 <1 49 <0.2 <5 MW-10S 6/1/2011 57 <50 <1 <5 <0.005 373 <1 65 <0.2 <5 MW-10S 10/5/2011 48 <50 <1 <5 <0.005 236 <1 35 <0.2 <5 MW-10S 2/8/2012 42 <50 <1 <5 <0.005 77 <1 23 <0.2 <5 MW-10S 6/6/2012 47 <50 <1 <5 <0.005 193 <1 25 <0.2 <5 MW-10S 10/4/2012 43 <50 <1 <5 <0.005 98 <1 20 <0.2 <5 MW-10S 2/7/2013 42 <50 <1 <5 <0.005 65 <1 16 <0.2 <5 MW-10S 6/5/2013 43 <50 <1 <5 <0.005 432 <1 20 <0.2 <5 MW-10S 10/1/2013 43 <50 <1 <5 <0.005 443 <1 18 <0.2 <5 MW-10S 2/6/2014 46 <50 <1 <5 <0.005 450 <1 22 <0.2 <5 MW-10S 6/4/2014 46 <50 <1 <5 <0.005 616 <1 24 <0.2 <5 MW-10S 10/8/2014 47 <50 <1 <5 <0.005 607 <1 22 <0.2 <5 MW-10S 2/4/2015 42 <50 <1 <5 <0.005 289 <1 17 <0.2 <5 MW-10S 6/8/2015 46 <50 <1 <5 <0.005 354 <1 16 <0.2 <5 MW-10S 10/6/2015 56 <50 <1 <5 <0.005 1230 <1 34 <0.2 <5 Marshall Steam Station Page 7 of 15 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: Units: = 700 µg/L 700 µg/L Boron 2 µg/L Cadmium 10 µg/L Chromium 1 mg/L Copper 300 µg/L 15 µg/L 50 µg/L 0.2 µg/L 100 µg/L MW-10S 2/4/2016 45 <50 <1 <5 <0.005 229 <1 14 <0.2 <5 MW-10S 6/1/2016 -- -- -- -- -- -- - MW-10D 2/7/2011 19 <50 <1 <5 <0.005 186 <1 97 <0.2 <5 MW-10D 6/1/2011 22 <50 <1 <5 <0.005 133 <1 81 <0.2 <5 MW-10D 10/5/2011 21 <50 <1 <5 <0.005 91 <1 59 <0.2 <5 MW-10D 2/8/2012 19 <50 <1 <5 <0.005 47 <1 38 <0.2 <5 MW-10D 6/6/2012 20 <50 <1 <5 <0.005 142 <1 30 <0.2 <5 MW-10D 10/4/2012 19 <50 <1 <5 <0.005 35 <1 19 <0.2 <5 MW-10D 2/7/2013 19 <50 <1 <5 <0.005 151 <1 11 <0.2 <5 MW-10D 6/5/2013 20 <50 <1 <5 <0.005 406 <1 14 <0.2 <5 MW-10D 10/1/2013 20 <50 <1 <5 <0.005 234 <1 9 <0.2 <5 MW-10D 2/6/2014 22 <50 <1 <5 <0.005 371 <1 10 <0.2 <5 MW-10D 6/4/2014 20 <50 <1 <5 <0.005 137 <1 7 <0.2 <5 MW-10D 10/8/2014 20 <50 <1 <5 <0.005 157 <1 6 <0.2 <5 MW-10D 2/4/2015 19 <50 <1 <5 <0.005 74 <1 <5 <0.2 <5 MW-10D 6/8/2015 20 <50 <1 <5 <0.005 82 <1 <5 <0.2 <5 MW-10D 10/6/2015 22 <50 <1 <5 <0.005 96 <1 6 <0.2 <5 MW-10D 2/4/2016 21 <50 <1 <5 <0.005 97 <1 <5 <0.2 <5 MW-10D 6/1/2016 -- -- -- -- -- -- - MW-11S 2/7/2011 25 <50 <1 <5 <0.005 199 <1 26 <0.2 <5 MW-11S 6/1/2011 34 <50 <1 <5 <0.005 467 <1 18 <0.2 <5 MW-11S 10/5/2011 29 <50 <1 <5 <0.005 176 <1 6 <0.2 <5 MW-11S 2/8/2012 28 <50 <1 <5 <0.005 137 <1 <5 <0.2 <5 MW-11S 6/6/2012 29 <50 <1 <5 <0.005 123 <1 <5 <0.2 <5 MW-11S 10/4/2012 32 <50 <1 <5 <0.005 324 <1 9 <0.2 <5 MW-11S 2/6/2013 28 <50 <1 <5 <0.005 70 <1 <5 <0.2 <5 MW-11S 6/5/2013 29 <50 <1 <5 <0.005 117 <1 <5 <0.2 <5 MW-11S 10/1/2013 30 <50 <1 <5 <0.005 114 <1 <5 <0.2 <5 MW-11S 2/6/2014 34 <50 <1 <5 <0.005 202 <1 <5 <0.2 <5 MW-11S 6/4/2014 33 <50 <1 <5 <0.005 92 <1 <5 <0.2 <5 MW-11S 10/8/2014 39 <50 <1 <5 <0.005 160 <1 6 <0.2 <5 MW-11S 2/4/2015 42 <50 <1 <5 <0.005 392 <1 9 <0.2 <5 MW-11S 6/8/2015 38 <50 <1 5 0.016 155 <1 5 <0.2 <5 MW-11S 10/7/2015 43 <50 <1 <5 <0.005 96 <1 <5 <0.2 <5 MW-11S 2/4/2016 43 <50 <1 5 <0.005 75 <1 <5 <0.2 <5 MW-11S 6/1/2016 -- -- -- -- -- -- - MW-11D 2/7/2011 67 <50 <1 <5 <0.005 839 <1 40 <0.2 <5 MW-11D 6/1/2011 69 <50 <1 <5 <0.005 368 <1 14 <0.2 <5 MW-11D 10/5/2011 63 <50 <1 5 <0.005 252 <1 8 <0.2 <5 MW-11D 2/8/2012 56 <50 <1 <5 <0.005 160 <1 <5 <0.2 <5 MW-11D 6/6/2012 57 <50 <1 <5 <0.005 325 <1 6 <0.2 <5 MW-11D 10/4/2012 55 <50 <1 <5 <0.005 178 <1 <5 <0.2 <5 MW-11D 2/6/2013 50 <50 <1 <5 <0.005 125 <1 <5 <0.2 <5 MW-11D 6/5/2013 62 <50 <1 7 <0.005 341 <1 5 <0.2 <5 MW-11D 10/1/2013 61 <50 <1 7 <0.005 220 <1 <5 <0.2 <5 MW-11D 2/6/2014 66 <50 <1 6 <0.005 501 <1 5 <0.2 <5 MW-11D 6/4/2014 62 <50 <1 7 <0.005 287 <1 <5 <0.2 <5 MW-11D 10/8/2014 61 <50 <1 6 <0.005 352 <1 <5 <0.2 <5 MW-11D 2/4/2015 58 <50 <1 9 <0.005 80 <1 <5 <0.2 <5 MW-11D 6/8/2015 59 <50 <1 9 <0.005 96 <1 <5 <0.2 <5 MW-11D 10/7/2015 64 <50 <1 8 <0.005 304 <1 5 <0.2 <5 MW-11D 2/4/2016 62 <50 <1 6 <0.005 741 <1 8 <0.2 <5 MW-11D 6/1/2016 -- -- -- -- -- -- -- MW-12S 2/7/2011 56 <50 <1 <5 <0.005 25 <1 46 <0.2 <5 MW-12S 6/1/2011 37 <50 <1 <5 <0.005 12 <1 29 <0.2 <5 MW-12S 10/5/2011 45 <50 <1 <5 <0.005 15 <1 14 <0.2 <5 Marshall Steam Station Page 8 of 15 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: Units: 700 µg/L 700 µg/L 2 µg/L 10 µg/L 1 mg/L 300 µg/L 15 µg/L 50 µg/L 0.2 µg/L 100 µg/L MW-12S MW-12S 2/8/2012 6/6/2012 Barium 54 42 Boron <50 <50 Cadmium <1 <1 Chromium <5 <5 Copper <0.005 <0.005 Iron 15 11 Lead <1 <1 Manganese 127 32 Thallium 0.2 <0.2 Nickel <5 <5 MW-12S 10/4/2012 41 <50 <1 <5 <0.005 12 <1 10 <0.2 <5 MW-12S 2/6/2013 36 <50 <1 <5 <0.005 16 <1 54 <0.2 <5 MW-12S 6/5/2013 52 <50 <1 <5 <0.005 79 <1 23 <0.2 <5 MW-12S 10/1/2013 41 <50 <1 <5 <0.005 61 <1 10 <0.2 <5 MW-12S 2/6/2014 73 <50 <1 <5 <0.005 25 <1 37 <0.2 <5 MW-12S 6/4/2014 22 <50 <1 <5 <0.005 34 <1 11 <0.2 <5 MW-12S 10/8/2014 49 <50 <1 <5 <0.005 37 <1 5 <0.2 <5 MW-12S 2/4/2015 52 <50 <1 <5 <0.005 19 <1 30 <0.2 <5 MW-12S 6/8/2015 23 <50 <1 <5 <0.005 28 <1 10 <0.2 <5 MW-12S 10/6/2015 49 <50 <1 <5 <0.005 53 <1 5 <0.2 <5 MW-12S 2/4/2016 51 <50 <1 <5 <0.005 134 <1 57 <0.2 <5 MW-12S 6/1/2016 -- -- -- -- -- MW-12D MW-12D MW-12D MW-12D MW-12D MW-12D MW-12D MW-12D MW-12D MW-12D MW-12D 2/7/2011 6/1/2011 10/5/2011 2/8/2012 6/6/2012 10/4/2012 2/6/2013 6/5/2013 10/1/2013 2/6/2014 6/4/2014 26 30 28 29 27 34 27 27 28 27 25 <50 <50 <50 <50 <50 <50 <50 <50 <50 <50 <50 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <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 <0.005 305 652 421 624 535 970 553 538 712 503 478 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 40 37 29 24 21 25 16 15 13 11 11 <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 MW-12D 10/8/2014 24 <50 <1 <5 <0.005 299 <1 9 <0.2 <5 MW-12D 2/4/2015 23 <50 <1 <5 <0.005 107 <1 6 <0.2 <5 MW-12D 6/8/2015 24 <50 <1 <5 <0.005 324 <1 7 <0.2 <5 MW-12D 10/6/2015 31 <50 <1 <5 <0.005 871 <1 16 <0.2 <5 MW-12D 2/4/2016 28 <50 <1 <5 <0.005 515 <1 9 <0.2 <5 MW-12D 6/1/2016 -- -- - -- -- -- - MW-13S 2/7/2011 46 <50 <1 <5 <0.005 1010 <1 54 <0.2 <5 MW-13S 6/1/2011 43 <50 <1 <5 <0.005 375 <1 27 <0.2 <5 MW-13S 10/5/2011 43 <50 <1 <5 <0.005 324 <1 26 <0.2 <5 MW-13S 2/8/2012 39 <50 <1 <5 <0.005 211 <1 17 <0.2 <5 MW-13S MW-13S MW-13S MW-13S MW-13S MW-13S 6/6/2012 10/4/2012 2/6/2013 6/5/2013 10/1/2013 2/6/2014 46 49 44 51 48 47 <50 <50 <50 <50 <50 <50 <1 <1 <1 <1 <1 <1 <5 <5 <5 <5 <5 <5 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 649 1060 421 1230 1470 787 <1 <1 <1 <1 <1 <1 27 49 17 31 25 16 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <5 <5 <5 <5 <5 <5 MW-13S 6/4/2014 41 <50 <1 <5 <0.005 221 <1 6 <0.2 <5 MW-13S MW-13S MW-13S MW-13S MW-13S MW-13S 10/8/2014 2/4/2015 6/8/2015 10/6/2015 2/4/2016 6/1/2016 66 48 64 42 48 -- <50 <50 <50 <50 <50 -- <1 <1 <1 <1 <1 - <5 <5 <5 <5 <5 -- <0.005 <0.005 <0.005 <0.005 <0.005 -- 2030 577 2740 823 1100 -- 1.75 <1 1.26 <1 <1 - 32 10 50 22 48 <0.2 <0.2 <0.2 <0.2 <0.2 <5 <5 <5 <5 <5 MW-13D 2/7/2011 42 <50 <1 <5 <0.005 24 <1 <5 <0.2 <5 MW-13D 6/1/2011 46 <50 <1 <5 <0.005 19 <1 <5 <0.2 <5 MW-13D 10/5/2011 45 <50 <1 <5 <0.005 17 <1 <5 <0.2 <5 MW-13D 2/8/2012 43 <50 <1 <5 <0.005 12 <1 <5 <0.2 <5 MW-13D 6/6/2012 46 <50 <1 <5 <0.005 12 <1 <5 <0.2 <5 MW-13D 10/4/2012 43 <50 <1 <5 <0.005 <10 <1 <5 <0.2 <5 MW-13D 2/6/2013 44 <50 <1 <5 <0.005 16 <1 <5 <0.2 <5 MW-13D 6/5/2013 47 <50 <1 <5 <0.005 24 <1 <5 <0.2 <5 Marshall Steam Station Page 9 of 15 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 700 700 2 10 1 300 15 50 02 100 Units: µg/L µg/L µg/L µg/L mg/L µg/L µg/L µg/L µg/L µg/L Well ID Sample D. Boron Cadmium Chromium Copper MW-13D 10/1/2013 46 <50 <1 <5 <0.005 25 <1 <5 <0.2 <5 MW-13D 2/6/2014 49 <50 <1 <5 <0.005 19 <1 <5 <0.2 <5 MW-13D 6/4/2014 45 <50 <1 <5 <0.005 18 <1 <5 <0.2 <5 MW-13D 10/8/2014 48 <50 <1 <5 <0.005 28 <1 <5 <0.2 <5 MW-13D 2/4/2015 47 <50 <1 <5 <0.005 22 <1 <5 <0.2 <5 MW-13D 6/8/2015 47 <50 <1 <5 <0.005 18 <1 <5 <0.2 <5 MW-13D 10/6/2015 48 <50 <1 <5 <0.005 28 <1 <5 <0.2 <5 MW-13D 2/4/2016 51 <50 <1 <5 <0.005 42 <1 <5 <0.2 <5 MW-13D 6/1/2016 -- -- -- -- -- -- -- MW-14S 2/7/2011 28 _ 4440 <1 <5 0.014 411 <1 192 <0.2 66 MW-14S 6/1/2011 25 4530 <1 <5 0.015 142 <1 147 <0.2 66 MW-14S 10/5/2011 24 4160 <1 <5 0.016 244 <1 110 <0.2 63 MW-14S 2/8/2012 24 4010 <1 <5 0.008 213 <1 95 <0.2 58 MW-14S 6/6/2012 24 3930 <1 <5 0.009 202 <1 85 <0.2 59 MW-14S 10/4/2012 28 3820 <1 <5 0.01 463 <1 82 <0.2 63 MW-14S 2/7/2013 23 3640 <1 <5 0.008 322 <1 69 <0.2 59 MW-14S 6/5/2013 31 3800 <1 <5 0.005 1160 <1 71 <0.2 56 MW-14S 10/1/2013 33 3750 <1 <5 0.006 1270 <1 66 <0.2 58 MW-14S 2/6/2014 28 3660 <1 <5 <0.005 583 <1 67 <0.2 58 MW-14S 6/4/2014 26 3190 <1 <5 <0.005 393 <1 77 <0.2 55 MW-14S 10/8/2014 48 3040 <1 <5 0.008 2460 <1 69 <0.2 58 MW-14S 2/4/2015 36 3000 <1 <5 0.005 1010 <1 47 <0.2 58 MW-14S 6/8/2015 31 2750 <1 <5 0.007 696 <1 43 0.225 56 MW-14S 10/6/2015 31 2510 <1 <5 0.011 451 <1 48 <0.2 48 MW-14S 2/4/2016 34 2520 <1 <5 0.009 569 <1 40 <0.2 47 MW-14S 6/1/2016 -- -- -- -- -- -- - MW-14D 2/7/2011 42 3600 <1 <5 <0.005 123 <1 73 <0.2 28 MW-14D 6/1/2011 43 3660 <1 <5 <0.005 159 <1 63 <0.2 27 MW-14D 10/5/2011 41 3520 <1 <5 <0.005 98 <1 57 <0.2 25 MW-14D 2/8/2012 38 3300 <1 <5 <0.005 81 <1 53 <0.2 24 MW-14D 6/6/2012 39 3320 <1 <5 <0.005 93 <1 51 <0.2 24 MW-14D 10/4/2012 38 3220 <1 <5 <0.005 94 <1 54 <0.2 25 MW-14D 2/7/2013 36 2960 <1 <5 <0.005 63 <1 46 <0.2 24 MW-14D 6/5/2013 38 3060 <1 <5 <0.005 95 <1 44 <0.2 23 MW-14D 10/1/2013 37 2970 <1 <5 <0.005 113 <1 43 <0.2 21 MW-14D 2/6/2014 37 2910 <1 <5 <0.005 124 <1 42 <0.2 23 MW-14D 6/4/2014 36 2750 <1 <5 <0.005 85 <1 40 <0.2 26 MW-14D 10/8/2014 35 2570 <1 <5 <0.005 78 <1 40 <0.2 23 MW-14D 2/4/2015 37 2640 <1 <5 <0.005 60 <1 40 <0.2 25 MW-14D 6/8/2015 36 2470 <1 <5 <0.005 108 <1 38 <0.2 24 MW-14D 10/6/2015 34 2280 <1 <5 <0.005 76 <1 42 <0.2 19 MW-14D 2/4/2016 37 2280 <1 <5 <0.005 96 <1 37 <0.2 18 MW-14D 6/1/2016 -- -- -- -- -- -- -- -- Notes: 1. °C indicates temperature measured in degrees celsius 2. mV indicates oxidation/reduction potential measured in millivolts 3. µf2/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 Marshall Steam Station Page 10 of 15 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 1 1 20 1 NS Well ID MW-4 Units: Sample Date, 11/8/2007 mg/L Zinc <0.005 µg/L Antimony* - µg/L Selenium <2 µg/L Mercury <0.1 NTU Turbidity (Field) 6.71 MW-4 2/12/2008 <0.005 <2 <0.2 14.4 MW-4 8/28/2008 <0 - <2 <0.05 2.93 MW-4 2/16/2009 <0.005 - <2 <0.05 4.33 MW-4 8/10/2009 <0.005 -- <1 <0.05 6.92 MW-4 2/8/2010 0.005 -- <1 <0.05 3.59 MW-4 2/7/2011 <0.005 <1 <1 <0.05 7.45 MW-4 6/1/2011 <0.005 <1 <1 <0.05 11.6 MW-4 10/5/2011 <0.005 <1 <1 <0.05 5.32 MW-4 2/8/2012 <0.005 <1 <1 <0.05 1.57 MW-4 6/6/2012 <0.005 <1 <1 <0.05 3.83 MW-4 10/4/2012 <0.005 <1 <1 <0.05 4.38 MW-4 2/6/2013 <0.005 <1 <1 <0.05 7.6 MW-4 6/5/2013 <0.005 <1 <1 <0.05 5.92 MW-4 10/1/2013 <0.005 <1 <1 <0.05 5.16 MW-4 2/6/2014 <0.005 <1 <1 <0.05 2.54 MW-4 6/4/2014 <0.005 <1 <1 <0.05 12.5 MW-4 10/8/2014 <0.005 <1 <1 <0.05 7.94 MW-4 2/4/2015 0.008 <1 <1 <0.05 11.5 MW-4 6/8/2015 <0.005 <1 <1 <0.05 0.99 MW-4 9/30/2015 -- -- -- -- 29.1 MW-4 10/6/2015 <0.005 1.12 <1 <0.05 2.72 MW-4 12/11/2015 -- -- -- -- 1.37 MW-4 2/4/2016 <0.005 <1 <1 <0.05 3.18 MW-4 6/1/2016 -- -- -- -- 0.78 MW-41) 11/8/2007 <0.005 - <2 <0.1 7.47 MW-41) 2/12/2008 <0.005 -- <2 <0.2 3.92 MW-41) 8/28/2008 <0 - <2 <0.05 2.86 MW-41) 2/16/2009 <0.005 -- <2 <0.05 2.48 MW-41) 8/10/2009 <0.005 - <1 <0.05 5.86 MW-41) 2/8/2010 <0.005 -- <1 <0.05 3.22 MW-41) 2/7/2011 <0.005 <1 <1 <0.05 4.85 MW-41) 6/1/2011 <0.005 <1 <1 <0.05 0.74 MW-41) 10/5/2011 <0.005 <1 <1 <0.05 0.74 MW-41) 2/8/2012 <0.005 <1 <1 <0.05 7.48 MW-41) 6/6/2012 <0.005 <1 <1 <0.05 1.08 MW-41) 10/4/2012 <0.005 <1 <1 <0.05 0.7 MW-41) 2/6/2013 <0.005 <1 <1 <0.05 1.85 MW-41) 6/5/2013 <0.005 <1 <1 <0.05 0.59 MW-41) 10/1/2013 <0.005 <1 <1 <0.05 1.03 MW-41) 2/6/2014 <0.005 <1 <1 <0.05 2.15 MW-41) 6/4/2014 <0.005 <1 <1 <0.05 5.63 MW-41) 10/8/2014 <0.005 <1 <1 <0.05 2.67 MW-41) 2/4/2015 0.005 <1 <1 <0.05 3.61 MW-41) 6/8/2015 <0.005 <1 <1 <0.05 0.83 MW-41) 9/30/2015 -- -- -- 9.61 MW-41) 10/6/2015 <0.005 1.25 <1 <0.05 4.07 MW-41) 12/11/2015 -- -- -- 1.28 MW-41) 2/4/2016 <0.005 <1 <1 <0.05 1.51 MW-41) 6/1/2016 -- -- 0.43 MW-6S 11/8/2007 -- - -- -- 891 MW-6S 8/28/2008 0.036 <2 <0.05 2.82 MW-6S 2/16/2009 0.114 - 2.7 <0.05 8.25 MW-6S 8/10/2009 0.172 1.5 <0.05 4.81 MW-6S 2/8/2010 0.201 -- 1.1 <0.05 30.4 MW-61) 11/8/2007 0.007 -- <2 <0.1 17.8 Marshall Steam Station Page 11 of 15 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells Standard: Well I' Sample Date Zinc Antimony* Selenium Mercury Turbidity (Field) MW-61) 8/28/2008 0.008 - <2 <0.05 23.4 MW-6D 2/16/2009 0.007 -- <2 <0.05 10.4 MW-61) 8/10/2009 0.005 - <1 <0.05 5.66 MW-6D 2/8/2010 0.006 -- <1 <0.05 4.36 MW-7S 11/8/2007 0.009 - <2 <0.1 2.5 MW-75 2/12/2008 0.021 -- 2.93 <0.2 2.4 MW-7S 8/28/2008 0.054 - 4.09 0.307 10 MW-75 2/16/2009 0.06 -- 10.6 0.141 8.87 MW-7S 8/10/2009 0.044 2.5 0.244 17 MW-7S 2/8/2010 0.043 - 1.9 0.23 10.7 MW-71) 11/8/2007 <0.005 <2 <0.1 0.2 MW-7D 2/12/2008 <0.005 - <2 <0.2 1.13 MW-71) 8/28/2008 <0 - <2 <0.05 2.23 MW-7D 2/16/2009 <0.005 - <2 <0.05 0.21 MW-71) 8/10/2009 <0.005 <1 <0.05 1 MW-7D 2/8/2010 <0.005 - <1 <0.05 1.29 MW-8S 11/8/2007 <0.005 - <2 <0.1 11 MW-85 2/12/2008 <0.005 - <2 <0.2 5.08 MW-8S 8/28/2008 <0 - 3.94 <0.05 1.84 MW-8S 2/16/2009 <0.005 - 2.96 <0.05 21.7 MW-8S 8/10/2009 <0.005 - 1.3 <0.05 7.5 MW-8S 2/8/2010 <0.005 - 6.5 <0.05 10.8 MW-81) 11/8/2007 0.015 - <2 <0.1 57 MW-8D 2/12/2008 0.007 - <2 <0.2 46.4 MW-81) 8/28/2008 <0 - <2 <0.05 12.2 MW-8D 2/16/2009 <0.005 - <2 <0.05 5.97 MW-81) 8/10/2009 <0.005 - <1 <0.05 7.34 MW-8D 2/8/2010 0.009 -- <1 <0.05 5.53 MW-9S 11/8/2007 <0.005 - <2 <0.1 8.74 MW-9S 2/12/2008 <0.005 -- <2 <0.2 5.76 MW-9S 8/28/2008 <0 - <2 <0.05 3.88 MW-9S 2/16/2009 <0.005 -- <2 <0.05 1.32 MW-9S 8/10/2009 <0.005 - <1 <0.05 2.31 MW-9S 2/8/2010 <0.005 - <1 <0.05 2.05 IVIVV-7U 11161LUU/ U.UUS -- "L GU.1 U.71 MW-9D 2/12/2008 <0.005 -- <2 <0.2 5.04 MW-91) 8/28/2008 <0 - <2 <0.05 2.23 MW-9D 2/16/2009 <0.005 -- <2 <0.05 1.99 MW-91) 8/10/2009 <0.005 - <1 <0.05 1.64 MW-9D 2/8/2010 <0.005 - <1 <0.05 1.97 MW-10S 2/7/2011 0.006 <1 <1 <0.05 12.5 MW-10S 6/1/2011 0.01 <1 <1 <0.05 23.8 MW-10S 10/5/2011 0.008 <1 <1 <0.05 12.8 MW-10S 2/8/2012 0.009 <1 <1 <0.05 6.72 MW-10S 6/6/2012 0.01 <1 <1 <0.05 11.6 MW-10S 10/4/2012 0.008 <1 <1 <0.05 9.01 MW-10S 2/7/2013 0.008 <1 <1 <0.05 6.52 MW-10S 6/5/2013 0.01 <1 <1 <0.05 5.77 MW-10S 10/1/2013 0.006 <1 <1 <0.05 9.12 MW-10S 2/6/2014 0.01 <1 <1 <0.05 8.3 MW-10S 6/4/2014 0.011 <1 <1 <0.05 16.8 MW-10S 10/8/2014 0.009 <1 <1 <0.05 11 MW-10S 2/4/2015 0.01 <1 <1 <0.05 9.94 MW-10S 6/8/2015 0.008 <1 <1 <0.05 6.59 MW-10S 10/6/2015 0.008 <1 <1 <0.05 15.2 Marshall Steam Station Page 12 of 15 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 20 NS Well f Sample Date Zinc Antimony* Selenium Mercury Turbidity (Field) w IVI W-1UJ L/4/LVlb U.UVZS <U.U.7 D MW-10S 6/1/2016 -- -- 8.28 MW-10D 2/7/2011 <0.005 <1 <1 <0.05 6.59 MW-10D 6/1/2011 0.006 <1 <1 <0.05 2.66 MW-10D 10/5/2011 <0.005 <1 <1 <0.05 2.21 MW-10D 2/8/2012 <0.005 <1 <1 <0.05 1.62 MW-10D 6/6/2012 <0.005 <1 <1 <0.05 3.28 MW-10D 10/4/2012 <0.005 <1 <1 <0.05 0.83 MW-10D 2/7/2013 <0.005 <1 <1 <0.05 5.14 MW-10D 6/5/2013 0.008 <1 <1 <0.05 6.79 MW-10D 10/1/2013 <0.005 <1 <1 <0.05 4.52 MW-10D 2/6/2014 0.006 <1 <1 <0.05 8.59 MW-10D 6/4/2014 <0.005 <1 <1 <0.05 7.36 MW-10D 10/8/2014 <0.005 <1 <1 <0.05 4.79 MW-10D 2/4/2015 <0.005 <1 <1 <0.05 4.74 MW-10D 6/8/2015 <0.005 <1 <1 <0.05 2.53 MW-10D 10/6/2015 <0.005 <1 <1 <0.05 2.82 MW-10D 2/4/2016 <0.005 <1 <1 <0.05 2.89 MW-10D 6/1/2016 -- -- -- -- 2.31 MW-11S 2/7/2011 <0.005 <1 <1 <0.05 15.3 MW-11S 6/1/2011 <0.005 <1 <1 <0.05 22 MW-11S 10/5/2011 <0.005 <1 <1 <0.05 18.3 MW-11S 2/8/2012 <0.005 <1 <1 <0.05 12.6 MW-11S 6/6/2012 <0.005 <1 <1 <0.05 11.7 MW-11S 10/4/2012 <0.005 <1 <1 <0.05 13.8 MW-11S 2/6/2013 0.012 <1 <1 <0.05 9.51 MW-11S 6/5/2013 <0.005 <1 <1 <0.05 5.37 MW-11S 10/1/2013 <0.005 <1 <1 <0.05 5.76 MW-11S 2/6/2014 <0.005 <1 <1 <0.05 8.43 MW-11S 6/4/2014 <0.005 <1 <1 <0.05 6.24 MW-11S 10/8/2014 <0.005 <1 <1 <0.05 7.28 MW-11S 2/4/2015 <0.005 <1 <1 <0.05 9.52 MW-11S 6/8/2015 <0.005 <1 <1 <0.05 6.16 MW-11S 10/7/2015 <0.005 <1 <1 <0.05 5.27 MW-11S 2/4/2016 <0.005 1.1 <1 <0.05 5.03 MW-11S 6/1/2016 -- -- -- -- 4.19 MW-11D 2/7/2011 <0.005 <1 <1 <0.05 35 MW-11D 6/1/2011 <0.005 <1 <1 <0.05 33.3 MW-11D 10/5/2011 <0.005 <1 <1 <0.05 12.2 MW-11D 2/8/2012 <0.005 <1 <1 <0.05 8.89 MW-11D 6/6/2012 <0.005 <1 <1 <0.05 14.1 MW-11D 10/4/2012 <0.005 <1 <1 <0.05 10.1 MW-11D 2/6/2013 <0.005 <1 <1 <0.05 7.54 MW-11D 6/5/2013 <0.005 <1 <1 <0.05 6.98 MW-11D 10/1/2013 <0.005 <1 <1 <0.05 4.63 MW-11D 2/6/2014 <0.005 <1 <1 <0.05 8.41 MW-11D 6/4/2014 <0.005 <1 <1 <0.05 6.47 MW-11D 10/8/2014 <0.005 <1 <1 <0.05 8.99 MW-11D 2/4/2015 <0.005 <1 <1 <0.05 2.87 MW-11D 6/8/2015 <0.005 <1 <1 <0.05 2.89 MW-11D 10/7/2015 0.005 1.08 <1 <0.05 8.35 MW-11D 2/4/2016 <0.005 1.29 <1 <0.05 17.9 /n /n w IVIVV-11U a/1/4v1u -- '- -- -- J.00 MW-12S 2/7/2011 <0.005 <1 <1 <0.05 6.89 MW-12S 6/1/2011 <0.005 <1 <1 <0.05 3.3 MW-12S 10/5/2011 <0.005 <1 <1 <0.05 5.99 Marshall Steam Station Page 13 of 15 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: 1 1 20 1 NS Units: mg/L µg/L µg/L µg/L NTU . -Turbidity MW-12S 2/8/2012 0.007 <1 <1 <0.05 1.65 MW-12S 6/6/2012 <0.005 <1 <1 <0.05 1.92 MW-12S 10/4/2012 <0.005 <1 <1 <0.05 3.35 MW-12S 2/6/2013 <0.005 <1 <1 <0.05 4.04 MW-12S 6/5/2013 <0.005 <1 <1 <0.05 2.19 MW-12S 10/1/2013 <0.005 <1 <1 <0.05 3.45 MW-12S 2/6/2014 0.008 <1 <1 <0.05 2.05 MW-12S 6/4/2014 <0.005 <1 <1 <0.05 2.36 MW-12S 10/8/2014 <0.005 <1 <1 <0.05 2.3 MW-12S 2/4/2015 0.005 <1 <1 <0.05 2.13 MW-12S 6/8/2015 <0.005 <1 <1 <0.05 3.5 MW-12S 10/6/2015 <0.005 <1 <1 <0.05 2.22 MW-12S 2/4/2016 0.007 1.08 <1 <0.05 6.42 MW-12S 6/1/2016 -- -- -- -- 2.83 MW-12D 2/7/2011 <0.005 <1 <1 <0.05 11 MW-12D 6/1/2011 <0.005 <1 <1 <0.05 13.8 MW-12D 10/5/2011 <0.005 <1 <1 <0.05 12.2 MW-12D 2/8/2012 <0.005 <1 <1 <0.05 9.8 MW-12D 6/6/2012 <0.005 <1 <1 <0.05 6.81 MW-12D 10/4/2012 0.005 <1 <1 <0.05 9.8 MW-12D 2/6/2013 <0.005 <1 <1 <0.05 9.6 MW-12D 6/5/2013 <0.005 <1 <1 <0.05 8.17 MW-12D 10/1/2013 <0.005 <1 <1 <0.05 8.93 MW-12D 2/6/2014 <0.005 <1 <1 <0.05 8.17 MW-12D 6/4/2014 <0.005 <1 <1 <0.05 8.55 MW-12D 10/8/2014 <0.005 <1 <1 <0.05 5.65 MW-12D 2/4/2015 <0.005 <1 <1 <0.05 3.11 MW-12D 6/8/2015 <0.005 <1 <1 <0.05 8.83 MW-12D 10/6/2015 <0.005 <1 <1 <0.05 13.8 MW-12D 2/4/2016 <0.005 1.09 <1 <0.05 10.9 MW-12D 6/1/2016 -- -- -- -- 8.96 MW-13S 2/7/2011 <0.005 <1 <1 <0.05 61.8 MW-13S 6/1/2011 <0.005 <1 <1 <0.05 17.8 MW-13S 10/5/2011 <0.005 <1 <1 <0.05 27.7 MW-13S 2/8/2012 <0.005 <1 <1 <0.05 7.91 MW-13S 6/6/2012 <0.005 <1 <1 <0.05 7.69 MW-13S 10/4/2012 <0.005 <1 <1 <0.05 23.9 MW-13S 2/6/2013 <0.005 <1 <1 <0.05 22.9 MW-13S 6/5/2013 0.006 <1 <1 <0.05 19.1 MW-13S 10/1/2013 <0.005 <1 <1 <0.05 26.7 MW-13S 2/6/2014 0.005 <1 <1 <0.05 16.7 MW-13S 6/4/2014 <0.005 <1 <1 <0.05 4.78 MW-13S 10/8/2014 0.008 <1 <1 <0.05 73.8 MW-13S 2/4/2015 <0.005 <1 <1 <0.05 11.4 MW-13S 6/8/2015 0.007 <1 <1 <0.05 82 MW-13S 10/6/2015 <0.005 <1 <1 <0.05 24.8 MW-13S 2/4/2016 <0.005 2.19 <1 <0.05 32.7 MW-13S 6/1/2016 -- -- -- -- 14.8 MW-13D 2/7/2011 <0.005 <1 <1 <0.05 2.66 MW-13D 6/1/2011 <0.005 <1 <1 <0.05 1.32 MW-13D 10/5/2011 <0.005 <1 <1 <0.05 4.6 MW-13D 2/8/2012 <0.005 <1 <1 <0.05 1.03 MW-13D 6/6/2012 <0.005 <1 <1 <0.05 0.44 MW-13D 10/4/2012 <0.005 <1 <1 <0.05 0.6 MW-13D 2/6/2013 <0.005 <1 <1 <0.05 1.59 MW-13D 6/5/2013 <0.005 <1 <1 <0.05 0.92 Marshall Steam Station Page 14 of 15 CSA Supplement 2 Table 1-2: Historical Data from NPDES Compliance and Voluntary Wells NCAC 2L Standard: Units: Pzt: NS NTU IVIVV-1.5U MW-13D lU/1//U13 2/6/2014 �U.UU.7 <0.005 'l <1 111 <1 11U.U.7 <0.05 1.10 1.89 MW-13D 6/4/2014 0.009 <1 <1 <0.05 1.59 MW-13D 10/8/2014 <0.005 <1 <1 <0.05 1.22 MW-13D 2/4/2015 <0.005 <1 <1 <0.05 2.13 MW-13D 6/8/2015 <0.005 <1 <1 <0.05 2.34 MW-13D 10/6/2015 <0.005 <1 <1 <0.05 1.19 MW-13D 2/4/2016 <0.005 1.21 <1 <0.05 2.65 MW-13D 6/1/2016 -- -- -- -- 2.43 MW-14S 2/7/2011 0.011 <1 7.7 <0.05 8.39 MW-14S 6/1/2011 0.013 <1 6.89 <0.05 2.74 MW-14S 10/5/2011 0.012 <1 7.13 <0.05 9.98 MW-14S 2/8/2012 0.011 <1 7.82 <0.05 3.39 MW-14S 6/6/2012 0.012 <1 7.18 <0.05 2.96 MW-14S 10/4/2012 0.013 <1 6.9 <0.05 9.86 MW-14S 2/7/2013 0.011 <1 7.69 <0.05 7.73 MW-14S 6/5/2013 0.012 <1 6.62 <0.05 6.47 MW-14S 10/1/2013 0.01 <1 6.4 <0.05 20.3 MW-14S 2/6/2014 0.015 <1 6.2 <0.05 5.21 MW-14S 6/4/2014 0.011 <1 6.25 <0.05 13.6 MW-14S 10/8/2014 0.015 <1 5.81 <0.05 52 MW-14S 2/4/2015 0.013 <1 5.42 <0.05 19.4 MW-14S 6/8/2015 0.013 <1 5.42 <0.05 8.23 MW-14S 10/6/2015 0.008 <1 4.78 <0.05 6.41 MW-14S 2/4/2016 0.01 <1 5.46 <0.05 8.7 MW-14S 6/1/2016 -- -- -- -- 8.91 MW-14D 2/7/2011 <0.005 <1 6.76 <0.05 2.95 MW-14D 6/1/2011 0.006 <1 6.26 <0.05 2.91 MW-14D 10/5/2011 0.005 <1 6.26 <0.05 6.57 MW-14D 2/8/2012 <0.005 <1 7.1 <0.05 1.82 MW-14D 6/6/2012 <0.005 <1 6.21 <0.05 1.2 MW-14D 10/4/2012 <0.005 <1 6.26 <0.05 1.51 MW-14D 2/7/2013 0.005 <1 5.65 <0.05 1.67 MW-14D 6/5/2013 0.005 <1 4.33 <0.05 1.07 MW-14D 10/1/2013 <0.005 <1 4.33 <0.05 1.29 MW-14D 2/6/2014 0.006 <1 4.29 <0.05 2.73 MW-14D 6/4/2014 <0.005 <1 4.35 <0.05 5.18 MW-14D 10/8/2014 0.005 <1 3.91 <0.05 1.48 MW-14D 2/4/2015 0.009 <1 3.74 <0.05 3.79 MW-14D 6/8/2015 0.006 <1 3.5 <0.05 2 MW-14D 10/6/2015 <0.005 <1 3.07 <0.05 1.23 MW-14D 2/4/2016 <0.005 <1 3.16 <0.05 1.65 MW-14D 6/1/2016 -- -- -- -- 0.71 Notes: 1. °C indicates temperature measured in degrees celsius 2. mV indicates oxidation/reduction potential measured in millivolts 3. µO/cm indicates specific conductivity measured in micromhos per centimeter 4. mg/L indicates concentrations measured in milligrams per liter 5. µg/L indicates concentrations measured in micrograms per liter 6. SU indicates pH values measured in standard units 7. NTU indicates turbidity values measured in Nephalometric Turbidity Units 8. Parameters are compared to standards found in 15A NCAC Subchapter 02L Classifications and Water Quality Standards Applicable to the Groundwaters of North Carolina 9. 2L Standards are established as part of 15A NCAC 02L .0202 10. Interim Maximum Allowable Concentrations (IMACs) can be found in Appendix #1 of 15A NCAC Subchapter 02L Classifications and Water Quality Standards Applicable to the Groundwaters of North Carolina Marshall Steam Station Page 15 of 15 CSA Supplement 2 Table 1-3: 2L Groundwater Standard Exceedances from NPDES Sampling 2L Standard: 700 300 50 250,000 500,000 6.5 — 8.5 Well IdF MW-4 Date 11/8/2007 Units: Range — 6/1/2016 No µg/L Boron Exceedances µg/L 300 —1,380 No µg/L Exceedances No µg/L Exceedances No µg/L Exceedances SU 5.91— 6.5 MW-4D 11/8/2007 — 6/1/2016 No Exceedances 376 — 405 No Exceedances No Exceedances No Exceedances 5.88 — 6.46 MW-105 2/7/2011— 6/1/2016 No Exceedances 354 —1,230 65 No Exceedances No Exceedances 5.06 — 5.66 MW-10D 2/7/2011— 6/1/2016 No Exceedances 371— 406 59 — 97 No Exceedances No Exceedances 6.17 — 6.48 MW-11S 2/7/2011— 6/1/2016 No Exceedances 324 — 467 No Exceedances No Exceedances No Exceedances 5.72 — 6.38 MW-11D 2/7/2011— 6/1/2016 No Exceedances 304 — 839 No Exceedances No Exceedances No Exceedances No Exceedances MW-12S 2/7/2011— 6/1/2016 No Exceedances No Exceedances 54 —127 No Exceedances No Exceedances 4.89 — 5.78 MW-12D 2/7/2011— 6/1/2016 No Exceedances 305 — 970 No Exceedances No Exceedances No Exceedances 5.89 — 6.37 MW-13S 2/7/2011— 6/1/2016 No Exceedances 324 — 2,740 54 No Exceedances No Exceedances 5.76 — 6.32 MW-13D 2/7/2011— 6/1/2016 No Exceedances No Exceedances No Exceedances No Exceedances No Exceedances 5.86 — 6.39 M W-14S 2/7/2011— 6/1/2016 2,510 — 4,530 322 — 2,460 66 —192 260,000 — 400,000 500,000 — 650,000 5.15 — 5.48 MW-14D 2/7/2011— 6/1/2016 2,280 — 3,660 No Exceedances 51— 73 270,000 — 310,000 510,000 — 540,000 5.31— 5.6 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 Marshall Steam Station Page 1 of 1 CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments Check latitude and longitude shown on report cover pages (the HDR will review and provide corrected latitude and longitude coordinates for the sites in forthcoming General 1 conversion appears to be incorrect on the Mooresville region reports, if needed. reports and needs to be reconciled). "Proposed Provisional Background Concentrations" or PPBCs is the terminology used for statistically Background 2 Use terminology PEPA "provisional estimates for purposes of determined background concentrations in the CAP reporting. PPBCs are discussed in CAP Part 1, Section 2. assessment" provide for background concentrations of COls. The approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. COI Use results from porewater, groundwater and other media to COls were selected based on exceedances found in porewater, groundwater, soil, and surface water 3 develop COI list. sample results. Hexavalent Chromium is included as a CO] in CAP Part 1 data tables and is considered with respect to the include as COI at each site duer interest and due to NC DHHS screening level and has been carried forward with subsequent evaluations. Samples were COI 4 receptor recepwell results. Use NCDHHS screening ning value. analyzed for Hexavalent Chromium in select groundwater monitoring wells, and further Cr(VI) evaluation may take place based on the results of each site respectively. CAP Part 1, Section 1.9.2 states that Cr(VI) is included in the COI list. Need to evaluate vanadium and strontium at every site to show Vanadium has been considered across the sites in CSA reporting. Strontium was not included in the CSA COI 5 differences between background concentrations and potential tables, however strontium data was collected with other constituents, including vanadium, and is source -related concentrations. presented in the CSA Supplement 2. COI - Receptors 6 Add evaluation of receptor wells in CAP. Water supply wells are shown on Figure 1-3 in the CSA Supplement 2 along with analytical results facilitating the interpretation of receptor water quality relative to site water quality. Private and public water supply wells sampled should be shown Water supply wells are shown on Figure 1-3 in the CSA Supplement 2 along with analytical results COI - Receptors 7 on a map with zoom in boxes showing concentration results even facilitating the interpretation of receptor water quality relative to site water quality. if below 2L. COI - Receptors 8 Add table with all receptor well results. Water supply wells are shown on Figure 1-3 in the CSA Supplement 2 along with analytical results facilitating the interpretation of receptor water quality relative to site water quality. All private receptor wells shown on figures (use or add DEQ designations). All water supply wells are shown on Figure 1-3. Those water supply wells that can be shown in the COI - Receptors 9 Show results for detection constituents. viewports of the the potentiometric surface and isoconcentration figures in the CSA Supplement 2 are also included. A table of analytical results, including strontium, is included on Figure 1-3. Add strontium. Add total uranium and Ra226+228. DEQ considers radionuclides to be a driver of alpha activity in the ash basins. Sample the following locations both below ash ponds and other downgradient areas Select wells located downstream and along transects were sampled for these constituents in the CSA and COI where other constituent concentrations are high: Post-CSA sampling periods. At the time of the CSA Supplement 2, the analytical results from Round 5 had 10 Downgradient monitoring well locations, at locations with been received and upon review, were recommended for re -issue prior to completing review and inclusion exceedances, and at background locations. in the CSA Supplement 2. Upon receipt, these data will be provided in a subsequent submittal. Uranium and Ra226+228 may be included in NPDES monitoring. List Federal MCL as standard for Ra 226-228 and uranium. Source Characterization 11 Address soils as being primary and secondary sources —address in A separate risk assessment has been provided subsequent to the CSA report by Duke Energy via Haley & CAP and CSA supplement. Aldritch. Source Characterization Describe how geochemical conditions may affect release of 12 Discussion of geochemical conditions were provided in CAP Part 2 with geochemical modeling results. naturally occurring constituents such as iron and manganese. CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments Source Characterization 13 Soil to be identified as secondary source — due to leaching of ash A separate risk assessment has been provided subsequent to the CSA report by Duke Energy via Haley & onto unsaturated soil. Aldritch. Background soil concentrations need to be evaluated. Native soils Background 14 may be a source based on geochemical conditions in/beneath the Proposed Provisional Background Concentrations or PPBCs are discussed in CAP Part 1, Section 2. The ash ponds. Need to address background soil conditions and approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. relationship to observed 2L exceedances. "Proposed Provisional Background Concentrations" or PPBCs is the terminology used for statistically Background 15 Provide "provisional estimates" of background if there are determined background concentrations in the CAP reporting. PPBCs are discussed in CAP Part 1, Section 2. insufficient numbers of samples for statistics. The approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. A similar analysis/evaluation of downgradient soils and their Background 16 relationship to 2L exceedances also needs to be included in the Proposed Provisional Background Concentrations or PPBCs are discussed in CAP Part 1, Section 2. The approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. CAP. Background Potential release mechanisms need to be considered in the CAP 17 Discussion of potential migration pathways is discussed in CAP Part 2, Section 3.3 (i.e., migration of leachate beneath the ash basin, etc.). Background determinations. Background concentrations need to "Proposed Provisional Background Concentrations" or PPBCs is the terminology used for statistically be evaluated to determine site -specific constituent concentration determined background concentrations in the CAP reporting. PPBCs are discussed in CAP Part 1, Section 2. Background 18 levels and this evaluation needs to be included in CAP. Use all The approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section available historic data from compliance wells and newly installed wells. 4. Background groundwater monitoring wells need to be sampled 2 Background 19 more times before the end of 2015 (samples need to be These samples have been collected. Data from Rounds 2 through 4 was included in the CAP Part 2. speciated). Separate background concentrations need to be determined for "Proposed Provisional Background Concentrations" or PPBCs are discussed in CAP Part 1, Section 2. The Background 20 shallow, intermediate and deep flow layers (as well as any other approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. site -specific conditions like wetlands). This approach includes consideration to these calcuations by flow layer. Background 21 Use all available site data (include example background wells PHR, Background data from historical sources was utilized where applicable in the CAP Part 2. FGD, Craig Rd.). Well and Constituents 22 Wells must meet 2C rule requirements; turbidity cannot impact Results from Round 5 sampling are presented in the CSA Supplement 2 and wells with turbidity results results. above 10 NTU are identified so that results may be qualified upon review. Elevated pH and turbidity must be addressed or well must be Duke Energy has installed additional monitoring wells to address concerns with elevated pH and turbidity Well and Constituents 23 redeveloped or replaced. seen when sampling as well as to refine understanding of exceedances. Results from the Round 5, including additional assessment wells, has been included in CSA Supplement 2. Include discussion of pH and turbidity in background well "Proposed Provisional Background Concentrations" or PPBCs are discussed in CAP Part 1, Section 2. The Well and Constituents 24 discussion. approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. This approach includes consideration to these calcuations by utilizing viable samples below 10 NTU. "Proposed Provisional Background Concentrations" or PPBCs are discussed in CAP Part 1, Section 2. The Well and Constituents 25 Results above 10 NTU to be removed from data set for statistics. approach to refine PPBCs when additional data is available is presented in CSA Supplement 2, Section 4. This approach includes consideration to these calcuations by utilizing viable samples below 10 NTU. CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments Soil Contamination 27 General Resolution delineation of COls are noted on cross sections included in the CSA Supplement 2. anuw tAWFIL of pmn nguleb dew un uu»>eu.wnb. Compare soil results to Preliminary Soil Remediation Goals (PSRG) Where additional soil samples were collected as part of the installation of additional assessment wells, for protection of groundwater standards (POG). those results will be presented to PSRG POG standards. Soil Contamination 28 roIKL vs. rw are issue Tor seiectea constituents; tnis may require uuKe tnergy worKea witn the Taos to reauce the reporting emits. however, iowenng me roircL to Detow ine resampling. FOG was not able to be achieved to date for certain constituents. Soils PSRGs, detection limits above standards is problematic. Soil Contamination 29 Review IHSB Guidelines for Assessment and Cleanup section Duke Energy worked with the labs to reduce the reporting limits. However, lowering the MRL to below the 4.1.1.2 to develop site specific background values for soil, if FOG was not able to be achieved to date for certain constituents. applicable Soil Contamination 30 Cr(VI) is driving risk, use Cr(VI) in review. In the CAP reporting as well as CSA Supplement 2, Cr(VI) is added to the list of Cols in groundwater. Soil Contamination 31 Need to compare soils results to Cr(VI) (not Cr(III)). Soils will be compared to the PSRG POG Cr(VI) standard of 3.8 mg/kg in subsequent reporting, where additional soil samples were collected. Hydrology/geologic controls and the effects on contaminant On June 25, 2015, NCDEQ requested that these geochemical issues be addressed in a Site Conceptual and transport are not discussed in CSA. Discuss Model. This topic was introduced in the CSA and announced that the SCM would be refined as an iterative Hydrologdistribution and Chemical Controls Chemical Controls 32 relative to DO, pH, Eh, etc. It is imperative that this discussion be process in the forthcoming CAP. CAP Part 1 Section 3.2.2 included discussion of general geochemical included as part of CAP #1 as this is requirement of CAMA. The characteristics such as cations/anions, redox potential, solute speciation, and Kd testing. These items were discussion can be refined in CAP #2. further addressed in CAP Part 2 Section 2.4.4, and Section 3.3. On June 25, 2015, NCDEQ requested that these geochemical issues be addressed in a Site Conceptual Model. This topic was introduced in the CSA and announced that the SCM would be refined as an iterative Hydrology/Geology and Discuss how geochemical conditions affect contaminant process in the forthcoming CAP. CAP Part 1 Section 3.2.2 included discussion of general geochemical Chemical Controls 33 distribution? (Geochemical "halo' releasing Mn and Fe). characteristics such as cations/anions, redox potential, solute speciation, and Kd testing. These items are further addressed in CAP Part 2 Section 2.4.4: Site Geochemistry and Influence on COls, which treats spatial distribution of groundwater geochemistry relative to the source area. Hydrology/Geology and 34 Specify where differences exist from LeGrand conceptual model. The CAP Part 2 report states where the model is consistent with LeGrand, specifically in the Groundwater Chemical Controls Migration subsection, and the COI Occurrence and Distribution Section. Groundwater velocities in bedrock and transition zone appear to Hydrology/Geology and Chemical Controls 35 be too high. Verify or correct these values. Describe transmissivity These values were corrected and updated in CAP Part 2 Appendix A. concept versus joint flow velocity. Hydrology/Geology and 36 Explain why one contaminant may be elevated in a particular area. CAP Part 2 Section 3.7 included an expanded discussion of site geochemical controls on contaminant Chemical Controls mobility and migration to address this concern. Hydrology/Geology and 37 Describe how constituents are mobilized or attenuated CAP Part 2 Section 3.7 included an expanded discussion of site geochemical controls on contaminant Chemical Controls . mobility and migration to address this concern. Describe geochemical conditions and mechanisms, and charges, The groundwater model considers linear adsorption (Freundlich adsorption for select COls in the Buck Hydrology/Geology and along flow paths. DEQ considers flow paths to be from the model) for COls (except sulfate and chloride). The adsorption term (Kd) is uniform within the model Chemical Controls 38 maximum concentration for a COI to a receptor or to the domain, including from the active and inactive ash basins/storage (sources) to downgradient monitor wells compliance boundary. and the compliance boundary. CAP Part 2, Appendix B, groundwater model. Hydrology/Geology and 39 Describe nature of sorptive materials present in three-part system Sorption constants and calculations are described in CAP Part 2 Section 4.3, in the methodology subsection Chemical Controls and along flow paths to receptors. CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments The groundwater model is setup per source area and then calibrated to concentrations observed in downgradient monitor wells. Calibration to observed concentrations is achieved by adjusting source Describe how boron, sulfate, TDS "islands" are located along flow concentrations within active/inactive ash basins and ash storage areas within the measured values, Hydrology/Geology and adjusting hydraulic conductivity based on reported values, adjusting kd based on lab data, and other chemical Controls 40 paths and how these are considered/incorporated into HGCM and measured hydrogeologic properties. The calibration attempts to match concentrations observed in numerical models. downgradient monitor wells by matching the flow paths and thus the observed COI "islands". The model did not incorporate TDS (boron and sulfate are both included in the groundwater model. CAP Part 2, Appendix B, groundwater model. Hydrology/Geology and Chemical Controls Hydrology/Geology and Chemical Controls Hydrogeologic and Other Geochemical Conceptual Subsurface drainage systems at dike/dams should be shown and 41 potential impacts to fate & transport modeling should be Subsurface drainage systems are shown and discussed in Section 4 of the CSA reports. They are shown in described in in hydrogeologic and geochemical conceptual the CSA Section 4 Figures. models. Pond, river, and lake elevations will be shown on figures where applicable. For example, in the CSA 42 Show measured water levels on ponds, streams, rivers. Supplement 2, these elevations are included on the shallow potentiometric figures, but not on all flow 43 Refined conceptual model needs to be presented in CAP I. Site Conceptual Models were updated and included in the CAP Part 2. Hydrogeologic and Other Geochemical Conceptual Models 44 Hydrogeo and geochemical conceptual models need to be discussed in terms of specific source areas. Include upgradient, source, and downgradient. Develop narrative for each source area and downgradient footprint (flow system recharge/discharge, horizontal flow direction, flow paths emanating from all sides (include map). CAP Part 2 Section 2.4.4 included discussion of geochemical parameters with consideration to whether there are trends upgradient or downgradient from the source. The refined SCM also included flow paths determined across the entire site. Hydrogeologic and Other Explain implications of vertical gradients in recharge and discharge Vertical hydraulic gradients were calculated for Round 2 data, and were included in CAP Part 1. The Geochemical Conceptual Models 45 area in each source area and its downgradient footprint. patterns in vertical gradients are discussed in CAP Part 2 Section 2.3.1.1. Hydrogeologic and Other Include effects f receptor wells in discussion. Also include In CAP Part 2 Appendix C, the issue of pumping wells is discussed. Where appropriate,. pumping wells are Geochemical Conceptual 46 possible impactssfrom basin to receptors in conceptual model included as an influence in the groundwater model. For example, for the DEC Cliffside site, the pumping Models discussions. wells weren't modeled because of the influence of the Broad River. Other DEC sites, such as Allen, Belews Creek, and Buck, the pumping wells were included in the model. Hydrogeologic and Other Site heterogeneities are not adequately explained. Explain existing The groundwater models are being updated and recalibrated including new data as it has becoms available Geochemical Conceptual 47 heterogeneities and implications for fate and transport modeling. as part of the expanded groundwater model domain activities. Uncertainties and limitations will be Models Describe uncertainties and explain impact of uncertainties. presented as part of the results, which are expected to be completed during Fall 2016. Hydrogeologic and Other The groundwater models are being updated and recalibrated including new data as it has becoms available Geochemical Conceptual 48 Explain impact of uncertainties in conceptual model. as part of the expanded groundwater model domain activities. Uncertainties and limitations will be Models presented as part of the results, which are expected to be completed during Fall 2016. Hydrogeologic and Other Geochemical Conceptual 49 Models Hydrogeologic and Other Geochemical Conceptual 50 Models Ensure that streams, wetlands, etc. shown in Section 12 are included on all figures as needed. Include in conceptual model discussions as appropriate. Description of AMEC ecological survey report findings not utilized in report or in figures. Data should be used, shown on figures or not. CAP Part 2 Section 2 figures include wetlands and streams. Ecological data concerning vegetation was included in the CSA Section 12 Risk Assessment and referenced in the Eco-Checklists provided for each site. CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments I Type Comment Number Comment Batch geochemical modeling for each of three layers per General Resolution As provided in CAP Part 2 Modeling Appendix B, Model Construction Section, each constituent was Modeling 51 constituent with narrative of what happens along flow path. modeled in one of 7 layers, which fall into the following categories: Ash material, Dike and ash storage Select flow path alignment with MOD PATH. material, Alluvium, M1 Saprolite, M2 Saprolite, Transition Zone, and Fractured bedrock. Describe geochemical conditions and mechanisms, and charges, Modeling 52 along flow paths. DEQ considers flow paths to be from the MODPATH was used to identify and delineate flow paths. This is displayed in CAP Part 2 Modeling Appendix maximum concentration for a COI to a receptor or to the B, Model Calibration in the particle tracking figure. compliance boundary. Model should use highest COPC in source area for model input. The model presented in the CAP Part 2 Appendix B uses variable concentrations in the source areas to Modeling 53 There will be different flow paths as flow path is based on match downgradient concentrations observed in monitor wells. In areas where the flow path from the maximum concentration of COI. source to an elevated observed concentration in a monitor well is observed, the highest measured source concentration is used in the model. Impacts from Fe, Mn are not related to Kd — how will modeling The groundwater model does not address Fe and Mn, however the geochemical modeling report does Modeling 54 treat Fe and Mn as COls (CAP Part 2 Appendix E), and determines the forms they likely exist in under address these constituents? conditions at the respective sites (CAP Part 2 Appendix E Section 2: Pourbaix diagrams). Modeling 55 Groundwater modeling should use site specific Kds. Sorption terms were developed and utilized as part of the groundwater modeling presented in CAP Part 2, Appendix B. Describe Kds and HFO or soil samples in areas not affected by ash. Modeling 56 Explain differences between these Kds and Kds from impacted A uniform Kd value for the groundwater model was utilized as these values are variable from sample to sample, regardless of site location (CAP Part 2, Appendix A, Groundwater Model). areas. Groundwater flow modeling in CAP needs to account for cumulative effect of off -site receptor wells (i.e., water supply The cumulative effect of off -site receptor wells were accounted for in the groundwater modeling (CAP Part wells). Need to come up with some assumptions regarding depth 2 Modeling Appendix B). The yield of these wells was estimated at 400 gpd, which is the average EPA I 57 and yield. CSA reports generally discount potential for upgradient household usage. The groundwater models are being updated and recalibrated including new data as it flow direction resulting from off -site pumping. Model results need has becoms available as part of the expanded groundwater model domain activities, including water supply to be included in the CAP now and revise once results are in from well information. Uncertainities and limitations will be presented as part of the results, which are expected data gap wells that are located to help inform groundwater flow to be completed during Fall 2016. direction near the property boundary. The groundwater model was calibrated to steady-state flow conditions and considered water levels from summer 2015. Historic water levels in the ponds were not modeled. The timing of start of the ash Modeling 58 Address historic water levels in pond in groundwater modeling. operations in different basins was considered in the groundwater model. The groundwater models are being updated and recalibrated including new data as it has becoms available as part of the expanded groundwater model domain activities, including historic water levels. Need to discuss how groundwater model results are incorporated The CAP Part 1 Surface water modeling Appendix details how groundwater model results are incorporated Modeling 59 in surface water model results (including how on -site streams are in surface water model results. incorporated). Modeling 60 Deep rock groundwater flow not well presented relative to off -site Particle flow maps that take into account offsite pumping are presented in the groundwater modeling pumping. This needs to be presented in CAP. Appendix B of the CAP Part 2. Subsurface drainage systems at dike/dams should be shown and Modeling 61 potential impacts to fate & transport modeling should be Subsurface drainage systems are shown and discussed in Section 4 of the CSA reports. considered. CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments r— �Type Comment Number Comment Guidelines require — seep, sediment, surface water, receptor well General Resolution CAP Part 2 included chem box maps for seeps, sediments, surface water, and groundwater. Chem boxes for Data Presentation 62 data, results show all COIs (field and results) in chem boxes. receptor wells were not able to be shown spatially for all sampling events, however, Figure 1-3 in the CSA Supplement 2 shows location and analytical results. Data Presentation 63 Show concentrations above PQLs on chem box maps, not just Chem box maps show all detected constituents for detection and assessment monitoring constituents as constituents above 2L. part of the CAP Part 2. Data Presentation 64 Add vertical gradients to figures —plan view. CAP Part 1 Section 3 included figures depicting vertical gradients between shallow and deep wells, and between deep and bedrock wells. Data Presentation 65 Add vertical gradient maps. CAP Part 1 Section 3 includes figures depicting vertical gradients between shallow and deep wells, and between deep and bedrock wells. Data Presentation 66 Develop a potentiometric surface map for the transition zone Deep flow layer wells are used to investigate the transition zone, and potentiometric surfaces figures were wells. developed as part of the CAP Part 2 as well as CSA Supplement 2. Piper diagram figures are in Section 10 of the CSA. Updated piper diagrams utilizing Round 5 data have Data Presentation 67 Show cation -anion balance values on Piper diagrams, remove been included in the CSA Supplement 2 to include only those events with balance differences that are less results with balance differences > 10%. than 10%. Show all receptor wells on figures given the existing figure Figure 1-3 in the CSA Supplement 2 presents all receptor wells and their analytical results. Those water Data Presentation 68 supply wells that can be shown in the viewports of the the potentiometric surface and isoconcentration extents. figures in the CSA Supplement 2 are also included. Data Presentation 69 Need one map with all receptor wells and MWs. Figure 1-3 in the CSA Supplement 2 presents all receptor wells and their analytical results. Data Presentation 70 Show seep results with chem boxes. Seeps and DEQ Seeps were provided in CAP Part 1 Section 2 figures. Data Presentation 71 Show topography on groundwater surface contour maps (add Topography has been included on the potentiometric surface figures provided in CSA Supplement 2. elevation labels to contours). Add geologic data and iso-concentration data (include Kds) on Cross -sections will be expanded with additional assessment monitoring wells for the CSA Supplement 2. Data Presentation 72 cross -sections. These will include lithology, recovery, ROD, where available, as well as the vertical extent of COls Data Presentation 73 Add figure showing pH, Eh, etc. results. CAP Part 1 Section 2 Chem Box figures included field parameters. Data Presentation 74 Add table w/NPDES sample event results. A NPDES sample events results table has been provided in Section 1 of the CSA Supplement 2. Data Presentation 75 Chem box figures for groundwater— add round 2 data as column Round 2 chembox figures were included in CAP Part 2. to right of existing data. Iso contours - Need to address how iso contour lines are shown on figures. Show part of the line as dashed where uncertainty exists Data Presentation 76 (i.e., no downgradient data to help determine extent of iso Isoconcentration maps utilizing Round 5 analytical results, including strontium, where it is a COI, are contour). Depict concentrations above reporting limit. included in CSA Supplement 2. Add iso-contour figure for strontium. Need to show natural resource information (i.e., surface water Data Presentation 77 features, wetland features, heron rookery at Buck, etc.) on "base CAP Part 2 Section 2 figures includes wetlands and streams which were delineated by USACE. Other map" figures. natural resources were included on figures as part of the Eco-Checklist referenced in Section 12 of the CSA. Data Presentation 78 Ensure that streams, wetlands, etc. shown in Section 12 are CAP Part 2 Section 2 figures included wetlands and streams as needed. included on all figures as needed. Data Presentation 79 Modify results tables to include field parameters DOs, Eh, spec Field parameters were included on the CAP Part 2 results tables, referenced in Section 2, as well as the CSA conductance, pH, NTU in all results tables. Supplement 2 results tables, referenced in Section 3. Surface, Groundwater Describe SW hydrology (streams, wetlands) in CAP and how CAP Part 2, Section 3 pertains to the Site Conceptual model, and it discusses surface water and seeps in Discharge 80 relates to seeps in CSM. relation to site source areas. Surface, Groundwater Check for alignment of description of streams and wetlands in CAP Part 2, Section 3 pertains to the Site Conceptual model, and it discusses surface water and seeps in Discharge 81 Section 12. relation to site source areas. CSA Supplement 2 Table 2-1: Responses to Global NCDEQ Comments CSA and CAP site maps include labels of major surface water bodies at each site. In addition, the CSA Surface, Groundwater Discharge 82 Show all surface water features on maps and cross sections. included surface water information in Figure 4-4: Surface Water Bodies. CAP Part 2 included Figure 3-1: Site Conceptual Model, and Figure 3-2: Cross Section with these features. Streamflow measurements have been incorporated into the expanded groundwater model domain Surface, Groundwater Discharge 83 Add wording on stream flow measurements performed. activities. The groundwater models are being updated and recalibrated including new data as it has becoms available and is expected to be completed during Fall 2016. Include non -trespassing recreation users of surface water and In the stand-alone Risk Assessment report, recreational swimmers, boaters, waders, and fishers are Risk Assessment 84 drinking water well receptors. included in the receptors, as are current/future off -site residents. In addition, a separate risk assessment has been provided subsequent to the CSA report by Duke Energy via Haley & Aldritch. Coal ash should be included as primary affected media until it is A separate risk assessment has been provided subsequent to the CSA report by Duke Energy via Haley & Risk Assessment 85 completely removed or otherwise made inaccessible to human Aldritch. contact. Revise Tables 12-1, 12-2, and wording in Section 12. Risk Assessment 86 Expand speciation results discussion with regards to receptors. A separate risk assessment has been provided subsequent to the CSA report by Duke Energy via Haley & Aldritch. Inadequate Data —All Where 2L exceedances intercept rivers/streams implications Vertical hydraulic gradients were calculated for Round 2 data, and were included in CAP Part 1. The Source Areas 87 should be discussed. Discuss vertical gradients for well pairs patterns in vertical gradients are discussed in CAP Part 2 Section 2.3.1.1. adjacent to rivers/streams. Inadequate Data — AII If a MW does not exist between a 2L exceedance and receptor Duke Energy has installed additional monitoring wells to address concerns to refine understanding of 88 (stream and water supply well) additional wells or transport exceedances. Results from the Round 5, including additional assessment wells, has been included in CSA Source Areas modeling is needed to fill data gap. Supplement 2. Inadequate Data —All If uncertainty exists about local flow due to insufficient number or Duke Energy has installed additional monitoring wells to address concerns to refine understanding of 89 placement of wells, then additional wells should be installed. exceedances. Results from the Round 5, including additional assessment wells, has been included in CSA Source Areas Same comment applies for uncertainty on vertical gradients. Supplement 2. CSA Supplement 2 Table 2-2. Total Porosity, Secondary (Effective) Porosity/Specific Yield, and Specific Storage for Lower Hydrostratigraphic Units (TZ and BR) H drostrati ra hic Unit y g p Secondary (Effective) Porosity / Specific Yield (%) Total Porosity% ( ) Specific Storage 1/ft p g ( ) Transition Zone (TZ) 5.0 - 10.0 5 - 15 1.0E-06 - 2.1 E-05 Bedrock (BR) - Fractured 2.0 - 5.0 5 - 10 < 1.0E-06 Bedrock (BR) - Dense 0-3 0-5 < 1.0E-06 Notes: 1. Ranges based on published values (Domenico and Mifflin, 1965; Singhal and Gupta, 2010). 2. Effective porosity and specific yield are not synonymous. For practical purposes, they may be estimated as approximately equal in value. 3. Table revised 07/13/2016. Marshall Steam Station Page 1 of 1 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: Date: Sample Type: Sample Name: AB-10D 4/11/2016 FD MA-AB-10D-FD AB-10D 4/11/2016 N MA-AB-10D AB-11D 4/11/2016 N MA-AB-11D AB-11S 4/11/2016 N MA-AB-11S AB-12D 4/7/2016 N MA-AB-12D AB-13D 4/7/2016 N MA-AB-13D AB-14D 4/8/2016 N MA-AB-14D AB-15BR 4/8/2016 N MA-AB-15BR AB-15BR 4/8/2016 FD A-AB-15BR-FD-MRM- AB-15D 4/8/2016 N MA-AB-15D 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 5000 U Alkalinity, HCO3 N ug/I 269000 274000 67800 17800 141000 155000 38100 155000 147000 175000 Alkalinity, lab N ug/I 269000 274000 67800 17800 141000 155000 38100 155000 147000 175000 Aluminum D ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Aluminum T ug/I 100 U 277 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Antimony D -- ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Antimony T 1 IMAC ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.63 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Arsenic D -- ug/I 0.57 J+ 0.52 J+ 0.12 0.11 274 0.28 0.099 J 0.082 J 0.094 J 0.096 J Arsenic T 10 02L ug/I 0.67 0.72 0,14 J+ 0.12 J+ 5 0.36 0.074 J 0.1 0.086 J 0.13 Barium D -- ug/I 374 376 14.9 10 88.4 170 128 105 105 220 Barium T 700 02L ug/I 441 443 17.5 11 88.6 178 126 102 105 208 Beryllium D -- ug/I 0.033 J+ 0.1 U 0.1 U 0.031 J 0.1 U 0.1 U 0.1 U 0.017 J 0.049 J 0.038 J Beryllium T 4 IMAC ug/I 0.049 J 0.02 J 0.02 J+ 0.1 U 0.01 J+ 0.1 U 0.01 J+ 0.039 J 0.1 U 0.1 U Boron D -- ug/I 965 980 50 U 50 U 2140 50 U 141 50 U 50 U 50 U Boron T 700 02L ug/I 1130 1130 50 U 50 U 2210 50 U 176 50 U 50 U 50 U Cadmium D -- ug/I 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.056 J 0.08 U 0.08 U 0.08 U Cadmium T 2 02L 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 0.08 U 0.08 U Calcium T -- ug/I 73500 73400 17900 824 207000 41100 13800 62400 61500 60100 Carbon N -- ug/I 780 J 880 J 1000 U 1000 U 19400 1000 U 17900 5000 1000 U 32500 Chloride N 250000 02L ug/I 4800 4800 2000 1500 354000 1800 2000 2200 2200 2600 Chromium D -- ug/I 0.21 J+ 0.5 U 0.22 J+ 0.55 J+ 0.5 U 0.3 J+ 2.3 0.14 J+ 0.24 J+ 0.26 J+ Chromium T 10 02L ug/I 0.28 J+ 0.56 J+ 0.41 J+ 0.65 J+ 0.88 J+ 0.79 J+ 2.2 0.23 J+ 0.19 J+ 0.5 J+ Chromium 6+ T 0.07 DHHS ug/I 0.03 U 0.03 U 0.09 0.4 0.09 0.025 J 1.5 0.03 U 0.03 U 0.03 U Cobalt D -- ug/I 7.6 7.1 0.088 J 0.69 0.012 J 1.1 0.075 J 0.019 J 0.032 J 0.012 J Cobalt T 1 IMAC ug/I 7.7 7.6 0.11 J+ 0.78 J+ 0.057 J 1.2 0.068 J 0.023 J 0.022 J 0.021 J Copper D -- ug/I 0.5 U 0.21 J+ 0.39 J 0.75 0.5 U 0.18 J+ 0.89 0.5 U 0.29 J 0.32 J Copper T 1000 02L ug/I 0.13 J+ 0.65 J+ 0.15 J+ 0.5 U 0.31 J 0.19 J+ 3.2 0.5 U 0.5 U 0.29 J Iron D -- ug/I 4130 4100 89.1 50 U 50 U 378 50 U 2230 2520 1890 Iron T 300 02L ug/I 4830 5150 27.7 J 31.5 J 50 U 487 50 U 2070 2390 1740 Lead D -- ug/I 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U Lead T 15 02L ug/I 0.1 U 0.4 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U Magnesium T -- ug/I 15700 15800 2870 358 7490 8400 3840 7850 7970 7250 Manganese D -- ug/I 3300 3340 12 75.6 133 156 11.3 255 260 198 Manganese T 50 02L ug/I 3890 3860 11.9 89.6 131 168 10.2 243 255 188 Mercury D -- ug/I 0.2U 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 0.2 U Methane N -- ug/I 808 J 607 J 1.4 J+ 9.3 J+ 11.4 J+ 3 J+ 1.7 J+ 9.4 J+ 10.6 J+ 10 J+ Molybdenum D -- ug/I 1.1 0.96 0.8 0.5 U 82.8 1.5 0.14 J 1.1 1.2 1 Molybdenum T -- ug/I 1.1 1.1 0.84 J+ 0.5 U 1.1 1.5 0.16 J 1.1 1.1 1.6 Nickel D -- ug/I 23.2 22.3 0.61 0.5 U 0.5 U 0.5 U 1.3 0.5 U 0.48 J 0.5 U Nickel T 100 02L ug/I 24.5 23.5 0.57 0.5 U 0.82 0.46 J 1.6 0.5 U 0.5 U 0.5 U Nitrogen, NO2 plus NO3 N -- ug/I 20 U 20 U 230 64 20 U 20 U 100 20 U 20 U 20 U Potassium T ug/I 4720 J 4740 J 5000 U 3070 J 7800 5150 5000 U 4460 J 4480 J 5280 Selenium D -- ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.62 0.5 U 0.5 U 0.5 U Selenium T 20 02L ug/I 0.5 U 0.5 U 0.5 U 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 9390 9350 8400 6580 108000 9730 7910 11600 11600 9580 Strontium D ug/I 2510 2520 1060 28.7 13200 581 317 1020 922 592 Strontium T -- ug/I 2960 2970 1260 33.6 12400 586 310 999 923 569 Sulfate N 250000 02L ug/I 5500 5300 4000 1000 185000 13700 27000 66000 68400 34500 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U Thallium T 0.2 IMAC ug/I 0.02 J 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 312000 310000 115000 25000 U 1080000 233000 111000 274000 275000 245000 Total Organic Carbon N -- ug/I -- -- -- -- -- -- -- -- -- -- Total Suspended Solids N ug/I 2500 U 5300 2500 U 2500 U 2800 14400 J+ 2500 U 4300 5100 4300 Uranium, Natural T ug/I 1.3 1.4 0.45 J 0.5 U -- -- -- -- -- -- Vanadium D -- ug/I 0.36 0.34 0.67 0.28 J 0.3 U 0.3 U 1.4 0.3 U 0.3 U 0.071 J Vanadium T 0.3 IMAC ug/I 0.43 1 0.76 J+ 0.3 J+ 0.69 0.073 J 1.4 0.3 U 0.3 U 0.74 Zinc D -- ug/I 10U 3.9J 4.5J 4.3J 10U 10U 3.1J 10U 10U 10U Zinc T 1000 02L ug/I 10 U 4.2 J 7.2 J 3.4 J 10 U 10 U 3.4 J 3 J+ 2.8 J+ 10 U Dissolved Oxygen N -- mg/I 0.9 0.9 1.2 0.4 0.3 0.4 1.6 0.35 0.35 3 Oxidation Reduction Potential N mV -23.6 -23.6 107.7 237.5 -282.4 38.1 130.7 -101.3 -101.3 95.4 pH N 6.5 - 8.5 02L SU 6.2 6.2 6.6 5.4 7.3 7.4 5.9 7.4 7.4 9.1 Marshall Steam Station Page 1 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: AB-10D AB-10D AB-11D AB-11S AB-12D AB-13D AB-14D AB-15BR AB-15BR AB-15D Date: 4/11/2016 4/11/2016 4/11/2016 4/11/2016 4/7/2016 4/7/2016 4/8/2016 4/8/2016 4/8/2016 4/8/2016 Sample Type: FD N N N N N N N FD N Sample Name: MA-AB-10D-FD MA-AB-10D MA-AB-11D MA-AB-11S MA-AB-12D MA-AB-13D MA-AB-14D MA-AB-15BR A-AB-I5BR-FD-MRM- MA-AB-15D NCDEQ 02L GWQS,IMAC, Constituent Fraction GWQS Source Unit or DHHS Specific Conductivity N PS/cm 557 557 157.4 51.2 1658 323.4 143.6 430.2 430.2 220.1 Temperature N Deg C 24 24 15.6 17.2 18.5 19.2 15.8 14.2 14.2 14.4 Turbidity, field N NTU 6.7 6.7 1.9 0.3 0.3 4.6 0 1.19 1.19 1.72 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCi/L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 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 Marshall Steam Station Page 2 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: Date: Sample Type: Sample Name: AB-16D 4/8/2016 N MA-AB-16D AB-16S 4/8/2016 N MA-AB-16S AB-17D 4/8/2016 N MA-AB-17D AB-18D 4/7/2016 N MA-AB-18D AB-1 BR 4/12/2016 N MA-AB-1 BR AB-1 D 4/11/2016 N MA-AB-1 D AB -IS 4/11/2016 N MA-AB-1 S AB-20D 4/12/2016 N MA-AB-20D AB-21 D 4/8/2016 N MA-AB-21 D AB-2D 4/12/2016 N MA-AB-2D 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 13200 5000 U 5000 U Alkalinity, HCO3 N ug/I 121000 91200 51100 63800 38900 26000 3200 J 23800 77300 61800 Alkalinity, lab N ug/I 121000 91200 51100 63800 38900 26000 3200 J 37000 77300 61800 Aluminum D ug/I 100 U 100 U 100 U 100 U 100 U 100 U 735 485 100 U 100 U Aluminum T ug/I 100 U 100 U 100 U 52.3 J 100 U 100 U 1500 629 100 U 78.6 J Antimony D -- ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.22 J 2.7 0.5 U 5 U Antimony T 1 IMAC ug/I 0.5 U 0.5 U 0.1 J 0.5 U 0.5 U 0.5 U 0.2 J 2.5 0.5 U 0.5 U Arsenic D -- ug/I 1.5 1.3 0.13 0.43 0.15 0.088 J+ 2.6 0.56 0.13 1 U Arsenic T 10 02L ug/I 2.5 2 0.16 0.47 0.17 0.092 J 3.3 0.6 0.11 0.13 Barium D -- ug/I 173 125 23.6 31.4 32.9 333 70.1 25 132 46 Barium T 700 02L ug/I 178 124 22.6 33.9 39.6 399 82.3 28.3 122 48.7 Beryllium D -- ug/I 0.017 J 0.1 UJ 0.1 U 0.1 U 0.1 U 0.1 U 0.94 0.026 J 0.1 U 1 U Beryllium T 4 IMAC ug/I 0.1 U 0.02 J 0.1 U 0.1 U 0.1 U 0.1 U 1.2 0.027 J 0.1 U 0.019 J Boron D -- ug/I 50 U 50 U 50 U 50 U 463 463 3810 50 U 50 U 388 Boron T 700 02L ug/I 50 U 29.8 J 50 U 50 U 546 553 4530 50 U 50 U 406 Cadmium D -- ug/I 0.08 U 0.071 J 0.075 J 0.08 U 0.08 U 0.052 J 0.2 0.08 U 0.061 J 0.8 U Cadmium T 2 02L ug/I 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.24 J+ 0.08 U 0.08 U 0.06 J Calcium T -- ug/I 31500 9760 9270 13100 47500 73000 95200 15500 12100 59900 Carbon N -- ug/I 2700 2100 1000 U 1000 U 1000 U 1000 U 1000 U 1000 1000 U 1000 U Chloride N 250000 02L ug/I 6000 5000 1100 1600 126000 187000 232000 3400 8600 4800J+ Chromium D -- ug/I 0.22 J+ 0.48 J+ 1.3 J+ 0.39 J+ 0.22 J 0.3 J 26.2 0.57 J+ 0.22 J+ 5 U Chromium T 10 02L ug/I 0.24 J+ 0.37 J+ 1.2 J+ 0.79 J+ 0.21 J+ 1.2 J+ 36.8 1 J+ 0.18 J+ 0.94 J+ Chromium 6+ T 0.07 DHHS ug/I 0.03 U 0.03 U 0.97 0.061 0.03 U 0.03 U 0.03 U 0.023 J 0.03 U 0.4 Cobalt D -- ug/I 0.63 70.5 0.087 J 0.22 0.95 1.9 26.9 0.037 J 0.81 0.38 J Cobalt T 1 IMAC ug/I 0.8 80.6 0.5 0.23 0.99 1.8 28 0.037 J 0.51 0.42 Copper D -- ug/I 0.18 J 0.65 0.43 J+ 0.32 J+ 0.5 U 0.57 0.52 0.86 0.5 U 5 U Copper T 1000 02L ug/I 0.62 0.49 J 0.42 J+ 0.39 J+ 0.14 J 0.5 J+ 8.1 0.74 0.5 U 2.5 Iron D -- ug/I 2630 9390 50 U 50 U 3690 694 5340 46.9 J 2370 62 Iron T 300 02L ug/I 2630 9160 34.1 J+ 77.9 4320 977 6560 67.2 2240 235 Lead D -- ug/I 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.2 0.1U 0.1U 1U Lead T 15 02L ug/I 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.7 0.1U 0.1U 0.11 Magnesium T -- ug/I 8300 10100 3380 2950 20300 18800 39300 718 9240 17600 Manganese D -- ug/I 304 2720 6.2 212 255 42.3 6730 5 U 104 37.4 Manganese T 50 02L ug/I 307 2720 6.9 211 275 47.4 7620 5 U 80.8 42.1 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 0.2 U Mercury T 1 02L ug/I 0.2U 0.2U 0.2U 0.2U 0.2U 0.15J 0.2U 0.2U 0.2U 0.2U Methane N -- ug/I 2.7 J+ 280 1.4 J+ 1.8 J+ 10 U 15.6 J+ 35.3 10 U 25.5 10 U Molybdenum D ug/I 1.2 0.5 U 0.36 J+ 1.6 0.32 J 0.13 J 0.58 13.6 0.75 5 U Molybdenum T ug/I 1.6 0.5 U 0.34 J 1.6 0.36 J 0.15 J 0.62 15.4 0.72 0.19 J Nickel D -- ug/I 1.3 23.8 0.73 2.1 0.99 1.1 43.6 0.52 1 5 U Nickel T 100 02L ug/I 0.7 24.7 0.87 2.4 0.5 U 1.4 25.2 0.66 0.69 0.67 Nitrogen, NO2 plus NO3 N -- ug/I 20 U 20 U 61 13 J 20 U 20 U 20 U 20 U 20 U 70 Potassium T ug/I 6230 5000 U 2500 J 5000 U 5100 6720 6090 7100 5840 4530 J Selenium D -- ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 14.9 0.37 J 0.5 U 5 U Selenium T 20 02L ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 22.5 0.77 0.5 U 0.44 J Sodium T -- ug/I 33700 16900 6680 8500 19000 20600 7280 16300 9080 14400 Strontium D ug/I 417 203 96.5 169 1020 1920 695 306 359 698 Strontium T -- ug/I 433 203 92.7 172 1220 2320 830 359 314 738 Sulfate N 250000 02L ug/I 57300 20100 8101 3600 37800 33300 120000 630J 6500 185000 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.1 U 0.03 J 0.1 U 0.1 U 0.1 U 0.1 U 0.28 0.1 U 0.1 U 1 U Thallium T 0.2 IMAC ug/I 0.1 U 0.061 J 0.1 U 0.1 U 0.1 U 0.1 U 0.32 0.1 U 0.1 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 234000 147000 69000 126000 332000 424000 572000 89000 149000 327000 Total Organic Carbon N -- ug/I -- -- -- -- -- -- -- -- -- -- Total Suspended Solids N ug/I 2500 U 3600 2500 U 18400 J+ 2500 U 2500 U 19400 2500 U 2500 U 2500 U Uranium, Natural T ug/I -- -- -- -- 0.099 J 0.5 U 0.098 J -- -- 1.7 J Vanadium D -- ug/I 0.13 J 0.085 J 4.2 2.5 0.11 J 0.62 0.16 J 1.5 0.17 J 3 U Vanadium T 0.3 IMAC ug/I 0.18 J 0.15 J 4.3 2.7 0.17 J 0.74 0.92 1.9 0.11 J 0.71 Zinc D -- ug/I 10U 3.1J 4.3J 10U 8.6J 5.2J 51.5 10U 10U 4J Zinc T 1000 02L ug/I 10 U 5 J+ 5.8 J 3.6 J 8.4 J 4.6 J 50 4.8 J 10 U 2.6 J Dissolved Oxygen N -- mg/I 0.36 0.17 4 0.2 0.36 0.3 0.2 2.7 0.4 0.22 Oxidation Reduction Potential N mV -104.6 59.2 81.9 140.2 -62 56.2 115.2 -56.8 -66.2 118 pH N 6.5 - 8.5 02L SU 7 5.9 6.5 6.2 6.37 6 5.4 10.3 6.3 6.08 Marshall Steam Station Page 3 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: AB-16D AB-16S AB-17D AB-18D AB-1 BR AB-1 D AB-1 S AB-20D AB-21 D AB-2D Date: 4/8/2016 4/8/2016 4/8/2016 4/7/2016 4/12/2016 4/11/2016 4/11/2016 4/12/2016 4/8/2016 4/12/2016 Sample Type: N N N N N N N N N N Sample Name: MA-AB-16D MA-AB-16S MA-AB-17D MA-AB-18D MA-AB-1 BR MA-AB-1 D MA-AB-1 S MA-AB-20D MA-AB-21 D MA-AB-2D NCDEQ 02L GWQS,IMAC, Constituent Fraction GWQS Source Unit or DHHS Specific Conductivity N PS/cm 417.9 240.7 92.2 136.4 557 741 1038 182.3 189.7 503 Temperature N Deg C 19.1 18.3 16.2 18.8 17 19.3 22.1 22.1 16.6 17 Turbidity, field N NTU 2.2 9.78 2.8 4.6 2.2 3.1 36.7 8 0.5 4.01 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCi/L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 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 Marshall Steam Station Page 4 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: Date: Sample Type: Sample Name: AB-2S 4/12/2016 N MA-AB-2S AB-3D 4/7/2016 N MA-AB-3D AB-4D 4/7/2016 N MA-AB-4D AB-5BR 4/7/2016 N MA-AB-5BR AB-5D 4/7/2016 FD MA-FD-AB-SD AB-5D 4/7/2016 N MA -AB -SD AB-6BR 4/7/2016 N MA-AB-6BR AB-6BR 4/7/2016 FD MA-FD-AB-6BR AB-6D 4/7/2016 N MA-AB-6D AB-7D 4/7/2016 N MA-AB-7D 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 582000 612000 5000 U 5000 U Alkalinity, HCO3 N ug/I 50900 111000 29900 236000 136000 133000 5000 U 5000 U 262000 111000 Alkalinity, lab N ug/I 50900 111000 29900 236000 136000 133000 703000 630000 262000 111000 Aluminum D ug/I 64.9 J 100 U 100 U 100 U 100 U 100 U 1570 1580 100 U 100 U Aluminum T ug/I 163 67.8 J 100 U 100 U 100 U 100 U 1560 1500 100 U 96.3 J Antimony D -- ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 5 U 0.47 J 0.5 U 0.2 J Antimony T 1 IMAC ug/I 0.1 J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 10 U 0.46 J 10 U 0.18 J Arsenic D -- ug/I 0.088 J 0.079 J 0.12 0.44 0.54 0.58 1.8 1.7 0.6 1.3 Arsenic T 10 02L ug/I 0.14 0.11 0.088 J 0.65 0.64 0.45 3.6 1.8 1.1 J 1.2 Barium D -- ug/I 72.7 110 54 169 321 327 456 465 78.4 203 Barium T 700 02L ug/I 82.2 113 53.8 214 313 318 523 428 68.4 261 Beryllium D -- ug/I 0.093 J 0.1 U 0.1 U 0.042 J 0.079 J 0.098 J 1 U 0.012 J 0.52 0.1 U Beryllium T 4 IMAC ug/I 0.13 0.03 J+ 0.1 U 0.039 J+ 0.079 J+ 0.039 J+ 2 U 0.1 U 0.48 J 0.1 U Boron D -- ug/I 32.9 J 139 340 50 U 50 U 50 U 50 U 26.2 J 5030 38.8 J Boron T 700 02L ug/I 35.3 J 141 350 50 U 50 U 50 U 39.4 J 26.5 J 5160 48 J Cadmium D -- ug/I 0.056 J 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.8 U 0.08 U 0.08 U 0.08 U Cadmium T 2 02L ug/I 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 1.6 U 0.08 U 1.6 U 0.08 U Calcium T -- ug/I 25500 31500 9430 40500 22900 23200 87000 76600 81300 25600 Carbon N -- ug/I 1000 U 1000 U 1000 U 1000 U 1000 U 1000 U 3100 2700 980 J 1000 U Chloride N 250000 02L ug/I 7600J+ 4800 7300 2300 3100 3200 2500 2400 3800 2400 Chromium D -- ug/I 0.38 J 0.69 0.5 U 0.55 0.21 J 0.26 J 2.3 J 2.2 0.41 J 0.95 Chromium T 10 02L ug/I 0.65 J+ 0.79 J+ 0.76 J+ 2.1 J+ 0.66 J+ 0.24 J+ 35.4 10.2 J+ 10 U 1.9 J+ Chromium 6+ T 0.07 DHHS ug/I 0.18 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U 0.98 0.9 0.03 U 0.18 Cobalt D -- ug/I 6.5 0.055 J 0.46 4.5 6.9 7 1.5 1.8 1.2 0.37 Cobalt T 1 IMAC ug/I 7.4 0.067 J 0.45 5.4 7.7 J 4.3 J 3.6 1.5 1.4 J 0.34 Copper D -- ug/I 0.81 1.6 2.2 0.43 J 0.5 U 0.16 J 5 U 0.39 J 3.4 0.62 Copper T 1000 02L ug/I 0.21 J 0.26 J 1.8 0.81 1.3 0.14 J 3.9 J 0.67 9.4 J 0.5 Iron D -- ug/I 333 50 U 27.9 J 196 2140 2180 50 U 102 4750 50 U Iron T 300 02L ug/I 580 26.5 J 137 202 2280 J 1320 J 76.9 50 U 4930 174 Lead D -- ug/I 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 1U 0.1U 0.1U 0.1U Lead T 15 02L ug/I 0.14 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 2 U 0.1 U 2 U 0.1 U Magnesium T -- ug/I 5150 16700 4380 14800 10300 10600 137 67J 8110 3710 Manganese D -- ug/I 652 27.2 56.9 247 925 910 5 U 5 U 388 48.6 Manganese T 50 02L ug/I 711 27.2 53.9 312 937 J 657 J 5 U 5 U 323 62.2 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 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 0.2U Methane N -- ug/I 40.8 10 U 1.6 J+ 2 J+ 16.2 28.5 145 J 190 J 167 1.6 J+ Molybdenum D ug/I 0.21 J 0.29 J 0.13 J 0.62 0.25 J 0.27 J 4.8 J 5.4 0.62 1.3 Molybdenum T ug/I 0.28 J 0.25 J 0.26 J 0.91 0.26 J 0.27 J 8.9 J 5.3 10 U 1.4 Nickel D -- ug/I 0.9 1.6 1.6 10 8.4 8.9 5 U 2.3 44 1.6 Nickel T 100 02L ug/I 0.72 1.5 1.5 9.2 8.9 8.2 10 U 2.5 60.8 1.7 Nitrogen, NO2 plus NO3 N -- ug/I 1900 20 U 20 U 20 U 20 U 20 U 20 20 U 20 U 20 U Potassium T ug/I 3260 J 5170 3930 J 58700 5510 5640 151000 136000 5920 8480 Selenium D -- ug/I 2.8 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 5 U 0.54 0.5 U 0.5 U Selenium T 20 02L ug/I 3.5 0.5 U 0.5 U 0.42 J 0.5 U 0.5 U 10 U 0.68 10 U 0.51 Sodium T -- ug/I 6020 17000 9480 39100 14900 14900 148000 135000 10800 16600 Strontium D ug/I 121 1010 188 1730 1450 1460 6630 6770 3880 700 Strontium T -- ug/I 141 987 178 1800 1380 1380 7120 6020 3970 842 Sulfate N 250000 02L ug/I 35900 89700 26700 92900 19500J 26100J 52000 52300 40200 7000 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.082 J 0.1 U 0.1 U 0.1 U 0.1 U 0.015 J 1 U 0.1 U 0.1 U 0.1 U Thallium T 0.2 IMAC ug/I 0.095 J 0.015 J 0.1 U 0.1 U 0.1 U 0.016 J 2 U 0.1 U 2 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 118000 318000 149000 431000 264000 305000 1280000 540000 378000 227000 Total Organic Carbon N -- ug/I -- -- -- -- -- -- -- -- -- -- Total Suspended Solids N ug/I 3600 3600 10800 2500 U 2500 U 5000 U 4900 2500 U 12400 2500 U Uranium, Natural T ug/I 0.11 J -- -- -- -- -- -- -- -- -- Vanadium D -- ug/I 0.16 J 2.7 0.3 U 0.11 J 0.19 J 0.21 J 6 6.6 0.2 J 6.6 Vanadium T 0.3 IMAC ug/I 0.39 2.9 0.14 J 0.22 J 0.22 J 0.16 J 11.6 6.8 6 U 7.9 Zinc D -- ug/I 7.9 J 5.9 J 17 J+ 10.5 J+ 7.7 J 11.4 10 U 10 U 8.6 J+ 3 J+ Zinc T 1000 02L ug/I 5.4 J 3.8 J 18.3 8.9 J 6.2 J 6.3 J 3.3 J 10 U 6.8 J 10 U Dissolved Oxygen N -- mg/I 0.71 0.3 2 0.4 0.2 0.2 0.3 0.3 0.5 0.7 Oxidation Reduction Potential N mV 1 97 108.3 153.2 28.7 38.9 38.9 -195.8 -195.8 -6.9 62.2 pH N 6.5 - 8.5 02L SU 1 5.95 6.2 6.2 6.6 5.9 5.9 12.5 12.5 6.1 7 Marshall Steam Station Page 5 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: AB-2S AB-31D AB-4D AB-5BR AB-5D AB-5D AB-6BR AB-6BR AB-6D AB-7D Date: 4/12/2016 4/7/2016 4/7/2016 4/7/2016 4/7/2016 4/7/2016 4/7/2016 4/7/2016 4/7/2016 4/7/2016 Sample Type: N N N N FD N N FD N N Sample Name: MA-AB-2S MA-AB-3D MA-AB-4D MA-AB-5BR MA-FD-AB-SD MA -AB -SD MA-AB-6BR MA-FD-AB-6BR MA-AB-6D MA-AB-7D NCDEQ 02L GWQS,IMAC, Constituent Fraction GWQS Source Unit or DHHS Specific Conductivity N PS/cm 210 317 127.2 569 240.5 240.5 3463 3463 554.1 224.4 Temperature N Deg C 17 21.5 18.8 18.8 19.6 19.6 16.5 16.5 16.9 19.6 Turbidity, field N NTU 8.67 5.7 2.6 1.3 0.7 0.7 4.6 4.6 0.2 4.5 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCi/L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 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 Marshall Steam Station Page 6 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: Date: Sample Type: Sample Name: AB-8D 4/7/2016 N MA -AB -BD AB-9BR 4/8/2016 FD MA-FD-AB-9BR AB-9BR 4/8/2016 N MA-AB-9BR AB-9D 4/8/2016 N MA-AB-9D AB-9S 4/8/2016 N MA-AB-9S AL-1D 4/12/2016 N MA-AL-1D AL-1S 4/12/2016 N MA-AL-1S AL-2BR 4/11/2016 N MA-AL-2BR AL-2D 4/11/2016 N MA-AL-21D AL-2S 4/8/2016 N MA-AL-2S 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 7000 5000 U 5000 U Alkalinity, HCO3 N ug/I 96000 113000 107000 97800 24200 19500 5000 U 21000 57400 17400 Alkalinity, lab N ug/I 96000 113000 107000 97800 24200 19500 5000 U 27900 57400 17400 Aluminum D ug/I 100 U 100 U 100 U 100 U 50.5 J 100 U 889 100 U 100 U 929 Aluminum T ug/I 100 U 100 U 100 U 100 U 59.8 J 100 U 1140 100 U 70.5 J 3850 Antimony D -- ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 5 U 5 U 1.6 0.28 J 0.16 J Antimony T 1 IMAC ug/I 0.12 J 0.5 U 0.51 0.5 U 0.5 U 5 U 5 U 1.5 0.35 J 1.3 Arsenic D -- ug/I 0.47 0.69 J+ 0.68 J+ 0.54 J+ 0.063 J+ 1 U 2.7 0.37 0.24 J+ 0.19 Arsenic T 10 02L ug/I 0.59 0.69 0.49 0.55 0.13 1 U 2.5 0.34 0.35 2.4 Barium D -- ug/I 45.3 155 153 214 16.4 801 224 114 66.9 52.2 Barium T 700 02L ug/I 42.6 155 J 79.5 J 226 15.9 811 242 136 81.6 84.1 Beryllium D -- ug/I 0.1 U 0.1 U 0.1 U 0.1 U 0.01 J+ 1 U 5 0.1 U 0.13 0.98 Beryllium T 4 IMAC ug/I 0.017 J 0.1 U 0.1 U 0.1 U 0.02 J+ 1 U 5.2 0.1 U 0.21 2.3 Boron D -- ug/I 50 U 50 U 26.1 J 50 U 32 J 1730 3850 1660 7260 8100 Boron T 700 02L ug/I 50 U 50 U 50 U 50 U 50 U 1790 4080 1950 8940 7670 Cadmium D -- ug/I 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.8 U 0.8 U 0.08 U 0.052 J 0.53 Cadmium T 2 02L ug/I 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.8 U 0.8 U 0.08 U 0.078 J 0.58 Calcium T -- ug/I 50900 29600 27600 14400 4180 93900 56300 31600 168000 267000 Carbon N -- ug/I 13000 1000 U 1000 U 1000 U 610 J See TOC See TOC 1000 U 1000 U 1000 U Chloride N 250000 02L ug/I 2800 1800 3100 1800 2500 276000 209000 3300 2400 1600 Chromium D -- ug/I 0.41 J+ 0.72 0.77 0.15 J 1.9 5 U 5 U 9.5 0.36 J+ 1.4 J+ Chromium T 10 02L ug/I 0.76 J+ 0.68 J+ 7.6 0.12 J+ 1.8 5 U 1.4 J 10.1 0.86 J+ 39.9 Chromium 6+ T 0.07 DHHS ug/I 0.018 J 0.059 5.5 0.03 U 1.1 0.03 U 0.078 14.5 0.03 U 0.79 Cobalt D -- ug/I 0.17 0.17 0.17 4.8 1.1 0.37 J 7.1 0.028 J 14 0.55 Cobalt T 1 IMAC ug/I 0.14 0.16 0.026 J 3 1.4 0.36 J 7.4 0.055 J 14 3.4 Copper D -- ug/I 0.32 J+ 0.5 U 0.57 0.5 U 2.1 5 U 6.7 0.22 J 8.7 3.1 Copper T 1000 02L ug/I 0.5 U 0.34 J 0.5 U 0.5 U 0.24 J 5 U 5 U 0.43 J 135 16.4 Iron D -- ug/I 39.5 J 523 505 836 96.6 50 U 50 U 50 U 233 1360 Iron T 300 02L ug/I 47.2 J 541 66.8 1140 500 56.2 150 39.1 J 575 4780 Lead D -- ug/I 0.1U 0.1U 0.1U 0.1U 0.1U 1U 1U 0.1U 0.1U 0.1U Lead T 15 02L ug/I 0.1U 0.1U 0.1U 0.1U 0.1U 1U 1U 0.1U 0.1U 8.2 Magnesium T -- ug/I 4950 6940J 2600J 10800 5140 23100 40100 6610 45300 80500 Manganese D -- ug/I 311 69.3 68.1 99.6 146 22 2340 5 U 2670 79.2 Manganese T 50 02L ug/I 250 69.2 9 98.6 159 26.7 2460 5 U 2970 126 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 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 1.2 Methane N -- ug/I 18.7 2 J+ 1.6 J+ 3.2 J+ 1.5 J+ 10 U 11 1.8 J+ 3.8 J+ 2 J+ Molybdenum D ug/I 3.4 7 7.2 2.3 0.5 U 5 U 5 U 35.2 4.8 0.31 J Molybdenum T ug/I 3.9 7.1 14.7 2.2 0.5 U 5 U 5 U 31.4 6.7 1.3 Nickel D -- ug/I 0.5 U 1.9 2.1 16.1 1.8 5 U 5 U 0.5 U 28.3 4.4 Nickel T 100 02L ug/I 0.62 1.9 0.5 U 11.7 2.2 5 U 5 U 1.3 29.6 19.2 Nitrogen, NO2 plus NO3 N -- ug/I 20 U 20 U 20 U 20 U 690 20 U 110 20 U 2400 1700 Potassium T ug/I 4670 J 7260 20500 8010 5000 U 9240 18800 37000 9860 8940 Selenium D -- ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 5 U 16.5 18.9 67.1 117 Selenium T 20 02L ug/I 0.5 U 0.5 U 0.57 0.5 U 0.5 U 5 U 11.7 16.4 77.5 119 Sodium T -- ug/I 14800 11900 13800 8300 2690J 30000 9940 28400 45200 69600 Strontium D ug/I 1680 215 213 237 41.4 5090 2550 1630 6240 4020 Strontium T -- ug/I 1540 214 214 236 39.1 5340 2720 1940 7810 4250 Sulfate N 250000 02L ug/I 90600 21800J 70000J 6300 6000 10900 96400 174000 606000 1210000 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.1 U 0.1 U 0.1 U 0.1 U 0.036 J 1 U 0.2 J 0.029 J 0.1 U 0.1 U Thallium T 0.2 IMAC ug/I 0.1 U 0.1 U 0.048 J 0.1 U 0.062 J 1 U 0.22 J 0.028 J 0.034 J 0.2 Total Dissolved Solids N 500000 02L ug/I 280000 187000 192000 139000 42000 560000 455000 330000 998000 1640000 Total Organic Carbon N -- ug/I -- -- -- -- -- 1000 U 1000 U -- -- -- Total Suspended Solids N ug/I 2500 U 2500 U 2500 U 5000 U 4000 2500 U 2600 5000 U 3000 38300 Uranium, Natural T ug/I -- 0.3 J 0.5 U 0.33 J 0.5 U 5 U 5 U -- -- -- Vanadium D -- ug/I 0.3 U 0.2 J 0.21 J 0.3 U 0.3 U 0.8 J 3 U 3.9 0.27 J 0.64 Vanadium T 0.3 IMAC ug/I 0.1 J 0.15 J 1.6 0.3 U 0.17 J 3 U 3 U 3.8 0.54 23.6 Zinc D -- ug/I 10 U 10 U 10 U 10 U 10 U 8.1 J 19.9 10 U 50.2 80.4 Zinc T 1000 02L ug/I 10 U 10 U 10 U 10 U 10 U 9.4 J 17.4 2.5 J 82.7 86 Dissolved Oxygen N -- mg/I 0.4 3 3 0.6 0.7 1.7 1.2 0.6 1 3.1 Oxidation Reduction Potential N mV 1 -160.3 24 24 -66.2 135.1 64.9 527.3 25.1 94.1 263.5 pH N 6.5 - 8.5 02L SU 1 7.9 9.4 9.4 6.6 5.7 5.6 4.5 9.5 6 5.3 Marshall Steam Station Page 7 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: AB-8D AB-9BR AB-9BR AB-9D AB-9S AL-1D AL-1S AL-2BR AL-21D AL-2S Date: 4/7/2016 4/8/2016 4/8/2016 4/8/2016 4/8/2016 4/12/2016 4/12/2016 4/11/2016 4/11/2016 4/8/2016 Sample Type: N FD N N N N N N N N Sample Name: MA -AB -BD MA-FD-AB-9BR MA-AB-9BR MA-AB-9D MA-AB-9S MA-AL-1D MA-AL-1S MA-AL-2BR MA-AL-2D MA-AL-2S NCDEQ 02L GWQS,IMAC, Constituent Fraction GWQS Source Unit or DHHS Specific Conductivity N PS/cm 388.3 302.2 302.2 219.2 80.8 970 826 423.2 1216 1920 Temperature N Deg C 15.5 14.9 14.9 14.1 14.2 16.6 19.4 21.5 21.5 20.8 Turbidity, field N NTU 1.1 2 2 0.1 9.1 1.8 8.5 9.2 8.4 30.65 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCi/L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 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 Marshall Steam Station Page 8 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: Date: Sample Type: Sample Name: AL-3D 4/11/2016 N MA-AL-3D AL-4D 4/8/2016 N MA-AL-4D BG-1BR 4/29/2016 N MA-BG-1BR BG-1D 3/15/2016 N MA-BG-1D BG-1S 3/15/2016 N MA-BG-1S BG-2BR 3/28/2016 N MA-BG-2BR BG-2S 3/28/2016 N MA-BG-2S BG-3BR 4/13/2016 N MA-BG-3BR BG-3D 3/15/2016 N MA-BG-3D BG-3D 3/15/2016 FD MA-BG-3D-FD 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 5000 U Alkalinity, HCO3 N ug/I 90500 33300 92400 76300 8200 86300 71400 108000 115000 110000 Alkalinity, lab N ug/I 90500 33300 92400 76300 8200 86300 71400 108000 115000 110000 Aluminum D ug/I 100 U 181 100 U 100 U 100 U 100 U 140 100 U 100 U 100 U Aluminum T ug/I 158 154 717 100 U 368 52.4 J 470 100 U 100 U 61.2 J Antimony D -- ug/I 1.3 J 5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.11 J 0.5 U 0.5 U 0.5 U Antimony T 1 IMAC ug/I 1.3 J 0.2 J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.12 J 0.5 U 0.5 U Arsenic D -- ug/I 1 U 1 U 0.18 0.62 0.047 J 0.21 0.19 0.3 0.38 0.34 Arsenic T 10 02L ug/I 1 U 0.19 0.25 0.56 0.11 0.23 0.26 0.3 0.41 0.43 Barium D -- ug/I 106 75.5 304 82 24 380 270 131 730 730 Barium T 700 02L ug/I 125 78.4 332 112 27.3 344 305 125 768 787 Beryllium D -- ug/I 1 U 1 U 0.1 U 0.023 J+ 0.025 J+ 0.1 U 0.012 J 0.1 U 0.1 U 0.1 U Beryllium T 4 IMAC ug/I 0.23 J 0.1 U 0.061 J+ 0.023 J 0.11 J+ 0.1 U 0.054 J 0.1 U 0.024 J 0.011 J Boron D -- ug/I 4000 17800 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U Boron T 700 02L ug/I 4720 21200 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U Cadmium D -- ug/I 0.8 U 0.8 U 0.08 U 0.077 J+ 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U Cadmium T 2 02L ug/I 0.8 U 0.058 J 0.08 U 0.053 J 0.08 U 0.08 U 0.08 U 0.08 U 0.054 J 0.08 U Calcium T -- ug/I 99500 140000 17700 12100 3760 14900 15300 13600 10900 10900 Carbon N -- ug/I 560 J 570 J -- -- -- -- -- -- -- -- Chloride N 250000 02L ug/I 3000 2200 2100 3300 1000 2500 2500 2400 2400 2400 Chromium D -- ug/I 5 U 1.8 J 0.61 J+ 1.4 J+ 2.1 7.9 5.7 3.5 J+ 4 J+ 3.9 J+ Chromium T 10 02L ug/I 1.8 J+ 9.8 60.6 2.2 J+ 4.3 8.3 J+ 6.8 J+ 7.3 4.4 4.3 Chromium 6+ T 0.07 DHHS ug/I 0.08 J+ 0.059 0.083 0.26 1.9 7.2 4.9 0.03 U 3.4 3.7 Cobalt D -- ug/I 1.3 1.4 1.4 1.3 0.13 0.037 J 0.25 2.4 0.25 J+ 0.26 J+ Cobalt T 1 IMAC ug/I 1.4 1.8 1.7 1.8 0.23 0.14 J+ 0.39 2.1 0.24 0.28 Copper D -- ug/I 4.4 J 5 U 0.16 J+ 12.8 J+ 0.84 0.47 J 0.44 J 0.48 J 0.46 J+ 2.7 J+ Copper T 1000 02L ug/I 5 U 1.2 2 2 0.46 J 0.77 J+ 0.61 J+ 0.36 J+ 0.49 J 0.43 J Iron D -- ug/I 91.6 339 62.3 50 U 50 U 50 U 80 462 50 U 50 U Iron T 300 02L ug/I 134 466 589 58.2 495 59.5 311 464 56.5 26 J Lead D -- ug/I 1 U 1 U 0.1 U 1.5 J+ 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.36 J+ Lead T 15 02L ug/I 1 U 0.15 0.23 0.1 U 0.18 0.11 0.22 0.1 U 0.1 U 0.1 U Magnesium T -- ug/I 30100 48400 7470 7320 5570 9370 6940 12900 14300 13900 Manganese D -- ug/I 402 124 54.6 18 5.8 2.7 J 3.5 J 174 24 24 Manganese T 50 02L ug/I 467 125 60.1 30.4 8.9 7.3 4.4 J 157 191 27.4 J Mercury D -- ug/I 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 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 0.2U Methane N -- ug/I 2.3 J+ 1.6 J+ 10 UJ 1.4 J+ 1.4 J+ 10 U 1.6 J+ 343 1.6 J+ 1.4 J+ Molybdenum D ug/I 6.8 2.9 J 1.9 0.63 0.5 U 0.25 J 0.28 J 4 0.31 J 0.31 J Molybdenum T ug/I 7.2 3 2.4 0.72 J+ 0.5 U 0.41 J+ 0.35 J+ 3.5 0.33 J+ 0.34 J+ Nickel D -- ug/I 4.8 J 10.6 16.9 7.3 J+ 2 0.86 2.5 7 5.8 J+ 5.8 J+ Nickel T 100 02L ug/I 5 U 14 31.8 7.4 2.6 0.99 J+ 2.8 J+ 6.4 6.5 6.3 Nitrogen, NO2 plus NO3 N -- ug/I 20 U 1400 240 950 3900 230 370 67 230 230 Potassium T ug/I 18300 10800 6450 4850 J 5000 U 6060 3530 J 8200 7390 7220 Selenium D -- ug/I 16.9 7 0.44 J 0.68 0.5 U 0.5 U 0.39 J 0.38 J 0.5 U 0.5 U Selenium T 20 02L ug/I 15.1 13.6 0.74 0.75 0.5 U 0.5 U 0.38 J 0.46 J 0.5 U 0.5 U Sodium T -- ug/I 32600 32200 11500 13000 5000 U 8030 9190 13400 15100 14900 Strontium D ug/I 1660 4170 218 580 73 230 200 173 150 150 Strontium T -- ug/I 1940 4600 230 657 76.9 218 223 170 159 162 Sulfate N 250000 02L ug/I 367000 587000 5500 13800 9500 2200 6700 10500 11700 11500 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 1U 1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U Thallium T 0.2 IMAC ug/I 1 U 0.062 J 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.023 J 0.019 J 0.018 J Total Dissolved Solids N 500000 02L ug/I 654000 906000 150000 123000 55000 153000 144000 167000 170000 182000 Total Organic Carbon N -- ug/I -- -- 1000 U 590 J 1400 1000 U 1000 U 1000 U 1000 U 1000 U Total Suspended Solids N ug/I 6200 9300 13100 2500 U 5000 U 2500 U 8900 2500 U 2500 U 2500 U Uranium, Natural T ug/I -- -- 0.39 J 0.078 J 0.5 U 0.076 J 0.13 J 0.12 J 0.065 J 0.5 U Vanadium D -- ug/I 3 U 1.2 J 8.3 2.7 0.28 J+ 14.3 10.8 4.8 20.5 20.7 Vanadium T 0.3 IMAC ug/I 3 U 1.8 10.7 2.2 1.4 14 12.8 4.7 20.5 22.3 Zinc D -- ug/I 40.9 7.2 J 10 U 22 J+ 10 U 10 U 18 J+ 4.8 J 9 J+ 11 J+ Zinc T 1000 02L ug/I 44.1 11.2 J+ 10 U 12 J+ 4.4 J+ 3.6 J 10 U 3.7 J+ 7.6 J+ 8 J+ Dissolved Oxygen N -- mg/I 2.1 1.3 -- 1.4 2.2 3.8 2.8 4.88 4.88 Oxidation Reduction Potential N mV 53.8 81.2 140.5 283.9 196.1 178.9 179.6 179.6 pH N 6.5 - 8.5 02L SU 6.6 6.3 6.3 5.2 6.9 6.4 6.5 6.5 Marshall Steam Station Page 9 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: AL-31D AL-41D BG-1BR BG-1D BG-1S BG-2BR BG-2S BG-3BR BG-3D BG-3D Date: 4/11/2016 4/8/2016 4/29/2016 3/15/2016 3/15/2016 3/28/2016 3/28/2016 4/13/2016 3/15/2016 3/15/2016 Sample Type: N N N N N N N N N FD Sample Name: MA-AL-31D MA-AL-41D MA-BG-1BR MA-BG-1D MA-BG-1S MA-BG-2BR MA-BG-2S MA-BG-3BR MA-BG-3D MA-BG-3D-FD NCDEQ 02L GWQS, Constituent Fraction GWQS Source Unit IMAC, or DHHS Specific Conductivity N PS/CM 886 1052 — 208 90.1 192.1 176 246.1 246.1 Temperature N Deg C 17.5 18.9 17.5 22.4 15.4 20.4 17.4 17.4 Turbidity, field N NTU 7.1 7.68 7.7 9.8 1.3 9.9 7.8 7.8 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCi/L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 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 Marshall Steam Station Page 10 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: Date: Sample Type: Sample Name: BG-3S 3/15/2016 N MA-BG-3S GWA-10D 4/11/2016 N MA-GWA-10D GWA-10S 4/27/2016 N MA-GWA-10S GWA-11D 4/12/2016 N MA-GWA-11D GWA-11S 4/27/2016 N MA-GWA-I1S GWA-1BR 4/12/2016 N MA-GWA-I BR GWA-1D 4/12/2016 N MA-GWA-1D GWA-1S 4/12/2016 N MA-GWA-1S GWA-2D 4/8/2016 N MA-GWA-2D GWA-2S 4/8/2016 N MA-GWA-2S 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 228000 5000 U Alkalinity, HCO3 N ug/I 73200 58600 27500 49400 22100 35600 49300 15000 45100 2400 J Alkalinity, lab N ug/I 73200 58600 27500 49400 22100 35600 49300 15000 273000 2400 J Aluminum D ug/I 100 U 64.3 J 100 U 100 U 100 U 100 U 100 U 100 U 640 63.2 J Aluminum T ug/I 704 100 U 182 100 U 191 100 U 100 U 256 590 70.7 J Antimony D -- ug/I 0.5 U 0.5 U 0.5 U 0.5 U 5 U 0.5 U 5 U 0.5 U 2.7 0.5 U Antimony T 1 IMAC ug/I 0.5 U 0.5 U 0.5 U 0.1 J 5 U 0.5 U 5 U 0.23 J 2.9 0.5 U Arsenic D -- ug/I 0.81 0.089 J+ 0.17 0.11 1 U 0.17 1 U 0.15 0.12 0.18 J+ Arsenic T 10 02L ug/I 1.1 0.1 0.18 0.11 1 U 0.21 1 U 0.2 0.12 0.17 Barium D -- ug/I 440 121 20.6 143 70.8 35.2 46 35.5 62.1 115 Barium T 700 02L ug/I 518 152 24 151 77.8 41.8 56.4 43.9 61.6 110 Beryllium D -- ug/I 0.1 U 0.1 U 0.08 J 0.1 U 1 U 0.1 U 1 U 0.42 0.1 U 0.22 Beryllium T 4 IMAC ug/I 0.1 U 0.039 J 0.075 J+ 0.048 J 0.27 J 0.1 U 1 U 0.41 0.039 J+ 0.19 J+ Boron D -- ug/I 50 U 50 U 50 U 746 2510 50 U 50 U 50 U 50 U 50 U Boron T 700 02L ug/I 50 U 35 J 50 U 787 2760 50 U 50 U 50 U 50 U 50 U Cadmium D -- ug/I 0.08 U 0.08 U 0.08 U 0.08 U 0.8 U 0.08 U 0.8 U 0.08 U 0.08 U 0.054 J Cadmium T 2 02L ug/I 0.08 U 0.08 U 0.08 U 0.08 U 0.8 U 0.08 U 0.8 U 0.08 U 0.08 U 0.062 J Calcium T -- ug/I 7370 46300 5970 27000 57600 19700 66900 1610 96700 12000 Carbon N -- ug/I -- -- -- -- -- 1000 U 1000 U 1000 U 29100 1000 U Chloride N 250000 02L ug/I 2100 1200 2600 3400 2800 3000 2000 2700 6700 1400 Chromium D -- ug/I 6.3 J+ 0.63 0.93 J+ 1.3 2.7 J 2.4 5 U 0.45 J+ 108 3 Chromium T 10 02L ug/I 19.3 0.57 J+ 1.5 J+ 1.4 1.4 J+ 3.1 5 U 0.51 J+ 114 2.6 Chromium 6+ T 0.07 DHHS ug/I 6.7 0.03 U 0.52 0.58 0.17 2.6 0.03 U 0.061 142 2.3 Cobalt D -- ug/I 0.065 J+ 2.8 3.4 0.4 0.46 J 0.78 0.56 J 4.2 0.064 J 8.1 Cobalt T 1 IMAC ug/I 0.81 3.2 4.1 0.37 0.41 J+ 0.8 0.52 J 3.8 0.085 J 8.4 Copper D -- ug/I 12 J+ 0.62 0.37 J+ 0.48 J 2.6 J 1.2 5 U 0.37 J 4.1 1.6 Copper T 1000 02L ug/I 2.4 0.35 J 0.39 J+ 0.16 J 1.2 J+ 0.33 J 5 U 0.41 J 4.7 0.15 J Iron D -- ug/I 50 U 869 46.5 J 69.8 28.3 J 50 U 147 793 50 U 50 U Iron T 300 02L ug/I 847 1020 280 86.9 348 55.1 231 1370 50 U 50 U Lead D -- ug/I 1.4 J+ 0.1U 0.1U 0.1U 1U 0.1U 1U 0.1U 0.1U 0.1U Lead T 15 02L ug/I 0.13 0.1 U 0.12 0.1 U 1 U 0.1 U 1 U 0.23 0.091 J 0.1 U Magnesium T -- ug/I 11200 26100 3000 9180 21100 6940 22100 468 100 U 13900 Manganese D -- ug/I 5 627 320 227 16.5 4.5 J 83.4 338 5 U 239 Manganese T 50 02L ug/I 12.8 740 356 256 19.1 7.2 84.4 344 5 U 248 Mercury D -- ug/I 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U Mercury T 1 02L ug/I 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U Methane N -- ug/I 1.6 J+ 2.2 J+ 10 U 10 U 10 UJ 10 U 59.3 10 U 2.1 J+ 1.4 J+ Molybdenum D ug/I 0.71 1.6 0.74 0.68 5 U 0.22 J 13.6 0.5 U 9 0.5 U Molybdenum T ug/I 0.59 J+ 1.7 0.85 0.64 5 U 0.26 J 13.1 0.5 U 8.8 0.5 U Nickel D -- ug/I 7.8 J+ 2.5 2.2 1.1 5 U 0.51 5 U 0.68 0.5 U 3 Nickel T 100 02L ug/I 16.7 2.9 2.7 0.94 5 U 0.54 5 U 0.67 0.5 U 2.5 Nitrogen, NO2 plus NO3 N -- ug/I 120 20 U 20 U 39 240 610 20 U 430 20 U 17 J Potassium T ug/I 4720 J 6180 5000 U 4480 J 7950 3560 J 7690 5000 U 4340 J 3010 J Selenium D -- ug/I 0.5 U 0.5 U 0.76 6.5 23.4 0.62 5 U 0.36 J 4.7 5.7 Selenium T 20 02L ug/I 0.5 U 0.5 U 0.94 6.9 25 0.72 5 U 0.96 5.2 6.4 Sodium T -- ug/I 8150 14400 11500 14800 31100 11100 18600 8200 63100 5000 U Strontium D ug/I 150 1480 305 1280 1070 269 839 37.4 701 43.9 Strontium T -- ug/I 152 1930 322 1360 1150 330 995 41.9 710 42.3 Sulfate N 250000 02L ug/I 10800 204000 17400 94300 261000 58300 236000 4400 96300 89500 Sulfide N -- ug/I 100 U 100 U 100 U 100 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.1U 0.1U 0.1U 0.1U 1U 0.1U 1U 0.1U 0.1U 0.17 Thallium T 0.2 IMAC ug/I 0.019 J 0.1 U 0.1 U 0.1 U 1 U 0.1 U 1 U 0.1 U 0.016 J 0.18 Total Dissolved Solids N 500000 02L ug/I 116000 367000 90000 211000 430000 324000 253000 47000 474000 139000 Total Organic Carbon N -- ug/I 1000 U 1000 U 520 J 16600 510 J -- -- -- -- -- Total Suspended Solids N ug/I 2500 U 5000 U 2500 U 2500 U 3200 2500 U 2500 U 35300 5000 U 2500 U Uranium, Natural T ug/I 0.5 U 0.095 J 0.5 U 0.075 J 0.21 J 0.12 J 5 U 0.067 J -- -- Vanadium D -- ug/I 5.6 0.94 0.68 1.7 3 U 3.4 3 U 0.15 J 22.2 0.09 J Vanadium T 0.3 IMAC ug/I 7.7 0.81 1.3 1.6 1.3 J 3.6 3 U 0.64 21.3 0.11 J Zinc D -- ug/I 53 J+ 4.4 J 10 U 6 J 39.8 3.3 J 4.1 J 11.2 10 U 11.3 Zinc T 1000 02L ug/I 27.9 J+ 3.9 J 10 U 4.7 J+ 23.2 10 U 4.3 J 8.7 J 10 U 12 Dissolved Oxygen N -- mg/I 3 0.1 1.6 0.5 1.3 3.9 1 3.7 0.6 7 Oxidation Reduction Potential N mV 176.2 -265.4 148.3 39.8 282.1 94.9 -11.8 119.9 -141.1 167.5 pH N 6.5 - 8.5 02L SU 6.3 6.8 5.9 6 5.3 6.4 6.7 5.5 11.8 5.2 Marshall Steam Station Page 11 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: BG-3S GWA-10D GWA-10S GWA-11D GWA-11S GWA-1BR GWA-1D GWA-1S GWA-2D GWA-2S Date: 3/15/2016 4/11/2016 4/27/2016 4/12/2016 4/27/2016 4/12/2016 4/12/2016 4/12/2016 4/8/2016 4/8/2016 Sample Type: N N N N N N N N N N Sample Name: MA-BG-3S MA-GWA-10D MA-GWA-10S MA-GWA-11D MA-GWA-11S MA-GWA-I BR MA-GWA-1D MA-GWA-1S MA-GWA-2D MA-GWA-2S NCDEQ 02L GWQS,IMAC, Constituent Fraction GWQS Source Unit or DHHS Specific Conductivity N PS/cm 176.4 523.7 107.8 300 584 211.3 585 56.3 1349 211.5 Temperature N Deg C 25.8 16.8 18.5 16.6 21.5 17.4 17.6 18.4 18.6 17.4 Turbidity, field N NTU 22 1.6 8.7 2.7 6.3 1.6 4.3 5.3 2.5 1.2 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCi/L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 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 Marshall Steam Station Page 12 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: Date: Sample Type: Sample Name: GWA-3D 4/11/2016 N MA-GWA-3D GWA-3S 4/11/2016 N MA-GWA-3S GWA-4D 4/12/2016 N MA-GWA-4D GWA-4S 4/12/2016 N MA-GWA-4S GWA-5D 4/12/2016 N MA-GWA-SD GWA-6D 4/12/2016 N MA-GWA-6D GWA-6S 4/12/2016 N MA-GWA-6S GWA-7D 4/12/2016 N MA-GWA-7D GWA-7S 4/12/2016 N MA-GWA-7S GWA-8D 4/12/2016 N MA-GWA-BD 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 5000 U Alkalinity, HCO3 N ug/I 53200 29300 120000 20800 12800 81500 18600 83100 91900 34500 Alkalinity, lab N ug/I 53200 29300 120000 20800 12800 81500 18600 83100 91900 34500 Aluminum D ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Aluminum T ug/I 100 U 107 73.8 J 1440 100 U 114 156 58.3 J 100 U 100 U Antimony D -- ug/I 0.5 U 0.5 U 1.4 0.89 0.5 U 0.19 J 0.72 0.5 U 0.2 J 0.5 U Antimony T 1 IMAC ug/I 0.5 U 0.5 U 0.62 1.6 0.5 U 0.23 J 0.87 0.5 U 0.4 J 0.5 U Arsenic D -- ug/I 0.14 0.048 J 1.3 0.053 J 0.093 J 1.1 0.1 U 0.14 0.19 0.14 Arsenic T 10 02L ug/I 0.11 J+ 0.047 J+ 1.5 0.3 0.12 1.1 J+ 0.086 J+ 0.18 0.23 0.12 Barium D -- ug/I 26 33 17.4 28 15.2 32.1 53.7 308 177 23 Barium T 700 02L ug/I 29.4 40.5 21.7 56.9 17.6 39.7 64.7 366 221 26.4 Beryllium D -- ug/I 0.1 U 0.053 J 0.032 J 0.018 J 0.1 U 0.1 U 0.25 0.1 U 0.02 J 0.029 J Beryllium T 4 IMAC ug/I 0.1 U 0.089 J+ 0.074 J 0.27 0.1 U 0.01 J+ 0.61 0.1 U 0.064 J 0.1 U Boron D -- ug/I 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U Boron T 700 02L ug/I 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U 50 U Cadmium D -- ug/I 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U Cadmium T 2 02L ug/I 0.08 U 0.08 U 0.08 U 0.19 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U Calcium T -- ug/I 13100 4570 31900 4300 2490 18800 2930 8840 11200 5850 Carbon N -- ug/I 14000 1000 U 3300 1000 U 1000 U 660 J 1000 U 1000 U 1000 U 1000 U Chloride N 250000 02L ug/I 1700 1900 4200 3000 1300 4000 2800 2500 3400 2400 Chromium D -- ug/I 0.69 J+ 0.53 J+ 0.42 J+ 1.3 0.81 J+ 0.5 J+ 6.1 4.8 3.1 0.5 J+ Chromium T 10 02L ug/I 0.74 J+ 0.53 J+ 1.8 J+ 6.1 0.63 J+ 0.96 J+ 13.5 5.6 5.5 1.1 J+ Chromium 6+ T 0.07 DHHS ug/I 0.45 0.34 0.03 U 0.12 0.42 0.028 J 0.35 5 2.7 0.28 Cobalt D -- ug/I 0.021 J 0.034 J 0.26 0.48 0.025 J 2.2 0.48 0.081 J 2 0.015 J Cobalt T 1 IMAC ug/I 0.022 J+ 0.037 J+ 0.33 2 0.029 J 2.4 0.6 0.12 2.7 0.048 J Copper D -- ug/I 0.57 0.97 1.5 6.9 0.36 J 0.86 29.1 0.2 J 2.1 0.3 J Copper T 1000 02L ug/I 0.16 J+ 0.31 J+ 10.2 J+ 131 0.5 U 1 76.8 0.5 U 2.3 0.32 J Iron D -- ug/I 50 U 50 U 50 U 35.6 J 50 U 62.4 55.6 50 U 41.6 J 50 U Iron T 300 02L ug/I 50 U 93.4 147 2690 50 U 166 291 65 728 43.5 J Lead D -- ug/I 0.1U 0.1U 0.0911 0.2 0.1U 0.11 0.1U 0.1U 0.1U 0.1U Lead T 15 02L ug/I 0.1 U 0.1 U 0.45 5.8 0.1 U 0.14 1.1 0.1 U 0.1 U 0.1 U Magnesium T -- ug/I 2020 1180 5010 1160 778 2790 668 13300 15200 1540 Manganese D -- ug/I 16 5 U 104 234 5 U 88.6 85.8 9.1 542 5.4 Manganese T 50 02L ug/I 18.2 4.3 J 142 380 2.8 J 110 101 13.7 834 14.3 Mercury D -- ug/I 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U Mercury T 1 02L ug/I 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U Methane N -- ug/I 1.6 J+ 1.5 J+ 10 U 11.9 10 U 10 U 10 U 10 U 15.4 10 U Molybdenum D ug/I 6.2 0.25 J 8.8 0.43 J 0.38 J 4.2 0.7 0.7 0.97 0.27 J Molybdenum T ug/I 5.9 0.29 J+ 9.3 1.1 0.33 J 4 1.4 0.73 1.2 0.31 J Nickel D -- ug/I 0.5 U 0.5 U 1.9 1 0.5 U 5.7 9.4 4.1 6.9 0.5 U Nickel T 100 02L ug/I 0.5 U 0.5 U 2.1 2.6 0.5 U 5.5 9.9 4.8 J+ 5.5 J+ 0.76 Nitrogen, NO2 plus NO3 N -- ug/I 130 400 20 U 920 710 48 78 280 47 280 Potassium T ug/I 5000 U 5000 U 3950 J 5000 U 5000 U 4040 J 5000 U 6920 4140 J 5000 U Selenium D -- ug/I 0.5 U 0.43 J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U Selenium T 20 02L ug/I 0.5 U 0.5 U 0.5 U 1.3 0.5 U 0.5 U 0.5 U 0.44 J 0.5 U 0.5 U Sodium T -- ug/I 7840 7890 26100 5460 5010 18100 5580 6410 699 77550 Strontium D ug/I 72.3 46 114 39.5 73.3 333 63.3 172 192 142 Strontium T -- ug/I 81.4 55.5 134 53.3 85.9 407 73.3 207 249 164 Sulfate N 250000 02L ug/I 3100 1100 35400 750 J 3000 15600 800 J 9000 10600 920 J Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U Thallium T 0.2 IMAC ug/I 0.1 U 0.1 U 0.1 U 0.062 J 0.1 U 0.1 U 0.018 J 0.1 U 0.1 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 90000 58000 183000 52000 56000 124000 41000 123000 107000 80000 Total Organic Carbon N -- ug/I -- -- -- -- -- -- -- -- -- -- Total Suspended Solids N ug/I 2500 U 2500 U 2500 U 27100 2500 U 3000 4000 2500 U 2500 U 2500 U Uranium, Natural T ug/I -- -- -- -- -- -- -- -- -- -- Vanadium D -- ug/I 1.8 0.57 1.7 0.42 1.4 1.7 0.22 J 3.6 0.38 2.7 Vanadium T 0.3 IMAC ug/I 1.8 0.66 J+ 1.8 9.2 1.4 1.9 0.6 4.2 0.55 3 Zinc D -- ug/I 10 U 7.9 J 10.4 40.5 16 3.1 J 70.8 4.2 J 4.5 J 10.4 Zinc T 1000 02L ug/I 59.7 10 U 1 20.9 1 117 1 8.3 J 10 U 94.5 7.3 J 7.4 J 4.8 J Dissolved Oxygen N -- mg/I 5.6 6.1 0.6 5.3 5.4 0.8 6.1 3.5 0.5 5.8 Oxidation Reduction Potential N mV 192.1 242.3 -132 229 218.8 57.8 183.3 148.7 93.7 213.2 pH N 6.5 - 8.5 02L F§U-1 6.2 5.5 7.6 5.85 5.8 7 5.8 6.5 6.5 6.1 Marshall Steam Station Page 13 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: GWA-3D GWA-3S GWA-4D GWA-4S GWA-5D GWA-6D GWA-6S GWA-7D GWA-7S GWA-8D Date: 4/11/2016 4/11/2016 4/12/2016 4/12/2016 4/12/2016 4/12/2016 4/12/2016 4/12/2016 4/12/2016 4/12/2016 Sample Type: N N N N N N N N N N Sample Name: MA-GWA-3D MA-GWA-3S MA-GWA-4D MA-GWA-4S MA-GWA-SD MA-GWA-6D MA-GWA-6S MA-GWA-7D MA-GWA-7S MA-GWA-BD NCDEQ 02L GWQS,IMAC, Constituent Fraction GWQS Source Unit or DHHS Specific Conductivity N PS/cm 119.5 73.3 314.5 62.8 49 209.9 52.2 186.2 213.7 80.8 Temperature N Deg C 16.9 16.5 19.5 18.5 16.6 18.3 20.6 16.9 18.1 17.4 Turbidity, field N NTU 0.4 2.3 8.9 21.21 0.3 9.3 9.3 2.8 9.4 2.2 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCi/L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 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 Marshall Steam Station Page 14 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: Date: Sample Type: Sample Name: GWA-8S 4/12/2016 N MA-GWA-8S GWA-9BR 4/11/2016 N MA-G'WA-9BR MS-10 3/15/2016 N MA-MS-10 MW-4 3/15/2016 N MA-MW-4 MW-4D 3/15/2016 N MA-MW-4D MW-6D 4/11/2016 N MA-MW-6D MW-6S 4/11/2016 N MA-MW-6S MW-7D 4/11/2016 N MA-MW-7D MW-7S 4/11/2016 N MA-MW-7S MW-8D 4/11/2016 N MA-MW-81D 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 5000 U Alkalinity, HCO3 N ug/I 30800 38600 3000 J 19300 35700 30200 5000 U 87700 5000 U 124000 Alkalinity, lab N ug/I 30800 38600 3000 J 19300 35700 30200 5000 U 87700 5000 U 124000 Aluminum D ug/I 100 U 100 U 100 U 100 U 100 U 100 U 4110 100 U 1510 100 U Aluminum T ug/I 459 100 U 89.2 J 50.3 J 190 87.6 J 4710 100 U 1700 132 Antimony D -- ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 5 U 5 U 1.2 J 5 U Antimony T 1 IMAC ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 5 U 5 U 5 U 5 U Arsenic D -- ug/I 0.046 J 0.1 U 0.1 U 0.1 U 0.058 J 0.1 U 4.9 1 U 4.7 1 U Arsenic T 10 02L ug/I 0.09 J 0.1 U 0.056 J 0.053 J 0.078 J 0.1 U 5.4 1 U 4.6 1 U Barium D -- ug/I 18.4 15.9 120 39 37 175 34 60.2 56.4 13.1 Barium T 700 02L ug/I 25.8 18.8 132 41.7 41 195 60.4 68 63.9 14.6 Beryllium D -- ug/I 0.1 U 0.017 J 0.2 J+ 0.049 J+ 0.1 U 0.1 U 1.2 1 U 1.6 1 U Beryllium T 4 IMAC ug/I 0.074 J+ 0.1 U 0.14 J+ 0.1 J+ 0.039 J+ 0.1 U 1.8 1 U 0.57 J 0.3 J Boron D -- ug/I 50 U 50 U 50 U 50 U 50 U 87.8 3580 158 3130 230 Boron T 700 02L ug/I 50 U 50 U 50 U 50 U 50 U 101 3910 189 3500 271 Cadmium D -- ug/I 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.087 1.2 0.8 U 1.2 0.8 U Cadmium T 2 02L ug/I 0.08 U 0.08 U 0.08 U 0.08 U 0.08 U 0.085 1.3 0.8 U 0.8 U 0.8 U Calcium T -- ug/I 6340 8930 236 3450 6120 27400 55600 80600 72600 75200 Carbon N -- ug/I 1000 U 1000 U -- -- -- 1000 U 1000 U 1000 U 1000 U 1000 U Chloride N 250000 02L ug/I 3900 4200 1100 1700 1300 81100 219000 67800 198000 6200 Chromium D -- ug/I 1.1 J+ 0.82 J+ 0.72 J+ 1.4 0.68 J+ 0.27 J 103 5 U 26.2 5 U Chromium T 10 02L ug/I 2.1 J+ 0.76 J+ 0.82 J+ 2 J+ 0.62 J+ 0.36 J+ 27 5 U 3.8 J 5 U Chromium 6+ T 0.07 DHHS ug/I 1.2 0.58 0.51 1.3 J- 0.34 0.019 J 0.081 0.03 U 0.03 U 0.03 U Cobalt D -- ug/I 0.03 J 0.1 U 0.56 0.1 U 0.1 U 0.08 J 182 1 U 48.4 0.25 J Cobalt T 1 IMAC ug/I 0.21 0.1 U 0.6 0.028 J 0.1 0.11 195 1 U 44.9 0.38 J Copper D -- ug/I 0.23 J 0.23 J 6.3 5.5 0.32 J 12 42.5 5.7 97.2 4.7 J Copper T 1000 02L ug/I 0.44 J 0.19 J+ 0.22 J 0.16 J 0.3 J 0.85 35.4 5 U 5 U 5 U Iron D -- ug/I 50 U 50 U 50 U 50 U 50 U 50 U 445 671 50 U 772 Iron T 300 02L ug/I 550 50 U 107 78.5 110 123 372 762 50 U 898 Lead D -- ug/I 0.1 U 0.1 U 0.68 0.58 0.1 U 1.6 1.9 1 U 26 1 U Lead T 15 02L ug/I 0.22 0.1 U 0.11 0.1 U 0.1 U 0.1 U 1 U 1 U 1 U 1 U Magnesium T -- ug/I 1480 2840 377 690 1370 9500 40700 7810 31600 4680 Manganese D -- ug/I 5 U 6.5 17 5 U 5 U 5.3 7110 533 4780 122 Manganese T 50 02L ug/I 9.2 8.3 21.9 5 U 5.1 8.3 7690 600 5270 116 Mercury D -- ug/I 0.2U 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 0.21 0.2 U 0.14 J 0.2 U Methane N -- ug/I 10 U 1.4 J+ 1.4 J+ 1.5 J+ 1.4 J+ 1.8 J+ 1.7 J+ 28.2 1.4 J+ 2.4 J+ Molybdenum D -- ug/I 0.17 J 0.43 J 0.5 U 0.5 U 0.32 J 0.14 J 1.4 J 5 U 6.1 5 U Molybdenum T -- ug/I 0.14 J 0.47 J+ 0.5 U 0.12 J 0.34 J 0.13 J 5 U 5 U 5 U 5 U Nickel D -- ug/I 0.5 U 0.5 U 1.6 0.5 U 0.5 U 1.1 74 5 U 8.4 5 U Nickel T 100 02L ug/I 0.72 0.5 U 1.4 0.5 0.46 J 0.92 28.4 5 U 5 U 5 U Nitrogen, NO2 plus NO3 N -- ug/I 20 U 1800 710 26 34 20 U 290 20 U 570 20 U Potassium T ug/I 5000 U 5000 U 5000 U 5000 U 5000 U 4090 J 5300 3780 J 3470 J 2910 J Selenium D -- ug/I 0.5 U 0.42 J 0.5 U 0.5 U 0.5 U 0.5 U 50.3 5 U 33.8 5 U Selenium T 20 02L ug/I 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.42 J 87.9 5 U 40.2 5 U Sodium T -- ug/I 7460 7200 5000 U 4320 J 8110 13400 6640 12600 6300 10500 Strontium D ug/I 156 50 18 73 170 927 79.2 1110 434 1600 Strontium T -- ug/I 184 59.7 20.1 78.7 189 1030 91.9 1260 486 1680 Sulfate N 250000 02L ug/I 4200 1000 600J 650J 1800 6200 112000 85100 113000 109000 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 UJ 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 1 U 1 U 1 U 1 U Thallium T 0.2 IMAC ug/I 0.025 J 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 1 U 1 U 1 U 1 U Total Dissolved Solids N 500000 02L ug/I 64000 77000 25000 U 36000 71000 250000 645000 431000 667000 321000 Total Organic Carbon N -- ug/I -- -- 1000 U 1000 U 13700 -- -- -- -- -- Total Suspended Solids N ug/I 6500 2500 U 2500 U 2500 U 3300 2500 U 19100 2600 U 2500 U 3700 Uranium, Natural T ug/I -- -- 0.5 U 0.5 U 0.5 U 0.5 U -- -- 5 U 5 U Vanadium D -- ug/I 2.6 2.8 0.23 J+ 0.64 J+ 2.3 0.21 J 3 U 3 U 3.1 3 U Vanadium T 0.3 IMAC ug/I 3.9 3.2 0.53 J+ 0.96 J+ 2.5 0.4 0.94 J 3 U 3 U 3 U Zinc D -- ug/I 16.6 10 U 9.9 J 6.5 J 10 U 23.4 187 12.4 32.7 6.7 J Zinc T 1000 02L ug/I 14.5 4.6 J 11.2 10 U 10 U 9.5 J 189 10 U 23.1 11.3 Dissolved Oxygen N -- mg/I 5.9 6.3 3.7 5.1 4.1 0.28 2.28 0.13 2.29 0.19 Oxidation Reduction Potential N mV 223.9 1 174.1 339.3 231.7 206.4 129 351 1 -61.9 341 27 pH N 6.5 - 8.5 02L SU 58 1 6.2 4.6 5.3 5.9 6.1 4.15 1 7.07 4.42> 6.55 Marshall Steam Station Page 15 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: GWA-8S GWA-9BR MS-10 MW-4 MW-4D MW-6D MW-6S MW-7D MW-7S MW-8D Date: 4/12/2016 4/11/2016 3/15/2016 3/15/2016 3/15/2016 4/11/2016 4/11/2016 4/11/2016 4/11/2016 4/11/2016 Sample Type: N N N N N N N N N N Sample Name: MA-GWA-BS MA-GWA-9BR MA-MS-10 MA-MW-4 MA-MW-4D MA-MW-6D MA-MW-6S MA-MW-7D MA-MW-7S MA-MW-BD NCDEQ 02L GWQS,IMAC, Constituent Fraction GWQS Source Unit or DHHS Specific Conductivity N PS/cm 82.3 107.6 23.5 56.1 87.5 347 970 557 930 497 Temperature N Deg C 16.7 16.7 20.8 16.7 17.6 19 17 17 16.9 17 Turbidity, field N NTU 9 0.1 7 0.5 1.6 4.77 1.28 0.37 4.8 3.64 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCi/L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 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 Marshall Steam Station Page 16 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: Date: Sample Type: Sample Name: MW-8S 4/11/2016 N MA-MW-8S MW-9D 4/11/2016 N MA-MW-9D MW-9S 4/11/2016 N MA-MW-9S MW-14BR 4/12/2016 N MA-MW-14BR OB-1 4/8/2016 N MA-013-1 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 Alkalinity, HCO3 N ug/I 414000 35200 211000 63200 9100 Alkalinity, lab N ug/I 414000 35200 211000 63200 9100 Aluminum D ug/I 100 U 100 U 100 U 100 U 100 U Aluminum T ug/I 100 U 93.5 J 100 U 73.1 J 96.8 J Antimony D -- ug/I 5 U 0.5 U 0.62 0.5 U 0.5 U Antimony T 1 IMAC ug/I 5 U 0.5 U 1.1 0.15 J 0.5 U Arsenic D -- ug/I 1 U 0.14 J+ 0.093 J+ 0.14 0.04 J Arsenic T 10 02L ug/I 1 U 0.17 0.11 0.19 0.088 J Barium D -- ug/I 108 93.4 218 30.5 41.3 Barium T 700 02L ug/I 122 113 261 26.6 40 Beryllium D -- ug/I 1 U 0.068 J+ 0.074 J+ 0.1 U 0.07 J Beryllium T 4 IMAC ug/I 1 U 0.098 J 0.19 0.1 U 0.049 J+ Boron D -- ug/I 198 397 50 U 55.3 50 U Boron T 700 02L ug/I 231 472 50 U 51.1 50 U Cadmium D -- ug/I 0.8 U 0.13 0.08 U 0.08 U 0.08 U Cadmium T 2 02L ug/I 0.8 U 0.16 J+ 0.08 U 0.08 U 0.08 U Calcium T -- ug/I 132000 60800 64600 16100 2040 Carbon N -- ug/I 1800 1000 U 44400 See TOC 1000 U Chloride N 250000 02L ug/I 2300 6000 10800 20600 1500 Chromium D -- ug/I 5 U 7.6 3.3 0.78 0.62 J+ Chromium T 10 02L ug/I 5 U 23.1 1.5 J+ 0.74 2.2 J+ Chromium 6+ T 0.07 DHHS ug/I 0.047 -- 0.21 0.23 0.12 Cobalt D -- ug/I 0.26 J 1.5 0.056 J 0.025 J 0.88 Cobalt T 1 IMAC ug/I 0.31 J 1.8 0.23 0.057 J 1.2 Copper D -- ug/I 3.5 J 3.7 8.5 0.77 0.88 J+ Copper T 1000 02L ug/I 5 U 3.1 J+ 32.6 2.1 0.29 J+ Iron D -- ug/I 50 U 135 50 U 50 U 117 Iron T 300 02L ug/I 72.2 398 177 71.8 165 J+ Lead D -- ug/I 1 U 0.1 U 0.1 U 0.1 U 0.1 U Lead T 15 02L ug/I 1 U 0.098 J 0.16 0.1 U 0.19 Magnesium T -- ug/I 25800 9230 13900 6810 346 Manganese D -- ug/I 1030 930 22.2 4.3 J 62.1 Manganese T 50 02L ug/I 1140 1120 143 6.4 61.2 Mercury D -- ug/I 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 Methane N -- ug/I 16.8 J+ 1.6 J+ 1.7 J+ 10 U 3 J+ Molybdenum D ug/I 5 U 0.42 J 0.81 0.41 J 0.5 U Molybdenum T ug/I 5 U 0.7 0.81 0.46 J 0.12 J Nickel D -- ug/I 5 U 10.5 1.5 0.72 0.86 Nickel T 100 02L ug/I 5 U 16.5 1.6 0.82 5.4 Nitrogen, NO2 plus NO3 N -- ug/I 20 U 20 U 1800 200 20 U Potassium T ug/I 7850 3860 J 4770 J 3960 J 5000 U Selenium D -- ug/I 4.8 J 0.5 U 0.5 U 1.5 0.5 U Selenium T 20 02L ug/I 3.5 J 0.5 U 0.5 U 1.4 0.5 U Sodium T -- ug/I 14300 12400 27900 13200 5000 U Strontium D ug/I 1420 1070 844 573 25.7 Strontium T -- ug/I 1620 1290 1050 552 24.6 Sulfate N 250000 02L ug/I 46800 176000 51800 9700 1000 U Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 1 U 0.1 U 0.1 U 0.1 U 0.041 J Thallium T 0.2 IMAC ug/I 1 U 0.015 J 0.019 J 0.1 U 0.071 J Total Dissolved Solids N 500000 02L ug/I 471000 315000 297000 145000 25000 U Total Organic Carbon N -- ug/I -- -- -- 1000 U -- Total Suspended Solids N ug/I 2500 U 2500 U 2500 U 5000 U 8000 Uranium, Natural T ug/I -- 0.22 J 0.4 J 0.085 J -- Vanadium D -- ug/I 3 U 0.5 1.4 3.3 0.3 U Vanadium T 0.3 IMAC ug/I 3 U 0.77 1.8 3.9 0.17 J Zinc D -- ug/I 5.4 J 12.1 35.1 7.2 J 13.6 Zinc T 1000 02L ug/I 10 U 8.3 J 44.3 10.2 14.8 Dissolved Oxygen N -- mg/I 0.18 0.2 1.6 1.5 7.3 Oxidation Reduction Potential N mV 60 134.2 174 109.6 199.6 pH N 6.5 - 8.5 02L SU 6.59 5.7 6.7 6.2 5.4 Marshall Steam Station Page 17 of 18 CSA Supplement 2 Table 3-1: Round 5 Analytical Results of Groundwater Monitoring Results Location: MW-8S MW-9D MW-9S MW-14BR OB-1 Date: 4/11/2016 4/11/2016 4/11/2016 4/12/2016 4/8/2016 Sample Type: N N N N N Sample Name: MA-MW-8S MA-MW-9D MA-MW-9S MA-MW-14BR MA-013-1 NCDEQ 02L GWQS,IMAC, Constituent Fraction or DHHS GWQS Source Unit Specific Conductivity N PS/cm 780 461.8 532.2 206.6 25 Temperature N Deg C 17 20.6 21.4 15.7 16.8 Turbidity, field N NTU 1.06 7.1 4.7 3.3 9.5 Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCi/L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 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 Marshall Steam Station Page 18 of 18 CSA Supplement 2 Table 3-2: Round 5 Analytical Results of Porewater Monitoring Results Location: Date: Sample Type: Sample Name: AB-10S 4/11/2016 N MA-AB-10S AB-10SL 4/11/2016 N MA-AB-10SL AB-12S 4/8/2016 N MA-AB-12S AB-12SL 4/7/2016 N MA-AB-12SL AB-13S 4/7/2016 N MA-AB-13S AB-14S 4/8/2016 N MA-AB-14S AB-15S 4/8/2016 N MA-AB-15S AB-15SL 4/8/2016 N MA-AB-15SL AB-17S 4/8/2016 N MA-AB-17S AB-18S 4/7/2016 N MA-AB-18S 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 5000 U Alkalinity, HCO3 IN ug/I 144000 238000 87000 378000 432000 276000 477000 139000 214000 167000 Alkalinity, lab IN ug/I 144000 238000 87000 378000 432000 276000 477000 139000 214000 167000 Aluminum D ug/I 100 U 90.8 J 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Aluminum T ug/I 100 U 53.7 J 79 J 56 J 100 U 100 U 55.3 J 100 U 50.6 J 100 U Antimony D -- ug/I 5 U 1.2 J 5 U 0.5 U 32.4 5 U 5 U 0.5 U 0.5 U 0.17 J Antimony T 1 IMAC ug/I 5 U 1.2 J 0.5 U 0.17 J 32.5 0.17 J 0.21 J 0.5 U 0.5 U 0.2 J Arsenic D -- ug/I 337 1250 143 49.2 202 887 1000 350 214 1100 Arsenic T 10 02L ug/I 330 1090 170 4220 230 790 1150 311 295 1280 Barium D -- ug/I 44 400 139 611 264 25.8 503 205 65.1 174 Barium T 700 02L ug/I 50.1 5 U 154 655 268 27.2 517 213 65.1 176 Beryllium D -- ug/I 0.3 J 1 U 0.17 J 0.1 U 0.014 J 1 U 1 U 0.022 J 0.012 J 0.018 J Beryllium T 4 IMAC ug/I 1 U 1 U 0.049 J+ 0.02 J+ 0.017 J 0.1 U 0.059 J 0.049 J 0.079 J+ 0.1 U Boron D -- ug/I 14300 8890 53400 2850 1050 5530 3530 312 10100 1190 Boron T 700 02L ug/I 14000 50 U 62200 3120 1110 6270 3540 326 11700 1260 Cadmium D -- ug/I 0.8 U 0.8 U 0.8 U 0.083 0.17 0.8 U 0.8 U 0.08 U 0.08 U 0.08 U Cadmium T 2 02L ug/I 0.8 U 0.8 U 0.08 U 0.086 0.38 0.08 U 0.051 J 0.08 U 0.08 U 0.08 U Calcium T -- ug/I 193000 210000 1830000 93300 151000 136000 148000 49700 81400 52400 Carbon N -- ug/I 1000 U 33100 1800 1200 1000 U 580 J 1000 U 1000 U 1000 U 700 J Chloride N 250000 02L ug/I 4900 7000 2410000 32800 2100 4500 15400 2500 12300 3400 Chromium D -- ug/I 5 U 5 U 5 U 0.14 J 0.22 J+ 5 U 5 U 0.33 J+ 0.47 J+ 0.2 J+ Chromium T 10 02L ug/I 5 U 5 U 0.22 J+ 1.3 J+ 1.5 J+ 0.21 J+ 0.38 J+ 0.26 J+ 0.23 J+ 0.54 J+ Chromium 6+ T 0.07 DHHS ug/I 0.03 U 0.03 U 0.03 U 0.03 U 0.03 UJ 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U Cobalt D -- ug/I 0.82 J 2.5 1 U 0.15 3.8 1 U 2.6 6 1.7 0.29 Cobalt T 1 IMAC ug/I 0.81 J 2 0.094 J 0.17 3.4 0.026 J 2.9 7.3 0.72 0.26 Copper D -- ug/I 5 U 5 U 5 U 0.5 U 0.3 J+ 5 U 5 U 0.38 J 0.5 U 1.3 J+ Copper T 1000 02L ug/I 5 U 5 U 0.5 U 0.3 J 0.24 J+ 0.5 U 0.29 J 0.65 0.5 U 0.5 U Iron D -- ug/I 4740 255 8730 6650 1740 27800 15000 12300 76000 2560 Iron T 300 02L ug/I 6540 50 U 9440 8290 2010 28500 15100 12700 83800 2550 Lead D -- ug/I 1U 1U 1U 0.1U 0.1U 1U 1U 0.1U 0.1U 0.1U Lead T 15 02L ug/I 1U 1U 0.1U 0.1U 0.1U 0.1U 0.15 0.1U 0.1 0.1U Magnesium T -- ug/I 41300 64400 1030000 32500 21200 90300 48100 12300 35200 12500J- Manganese D -- ug/I 1040 606 4170 827 171 6830 2530 2260 14700 320 Manganese T 50 02L ug/I 1150 5 U 4230 819 149 6930 2560 2360 17000 296 Mercury D -- ug/I 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U Mercury T 1 02L ug/I 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U 0.2U Methane N -- ug/I 37.3 145 95 13900 2.4 J+ 252 179 1380 1180 4780 Molybdenum D ug/I 1930 4220 3.1 847 76.3 4.4 J 20.8 18.9 5.3 130 Molybdenum T ug/I 1820 3600 3.4 980 69.8 4.1 23.8 16.8 5.2 139 Nickel D -- ug/I 5 U 26.2 5 U 2.2 7.2 5 U 5 U 1.8 0.48 J 1.5 Nickel T 100 02L ug/I 5 U 21.2 0.6 2.9 8 0.5 U 2.9 0.75 0.5 U 1.7 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 20 U Potassium T ug/I 80600 32300 12100 8870 8300 41900 17900 3940J 13400 8930 Selenium D -- ug/I 5 U 5 U 5 U 0.32 J 206 5 U 5 U 0.5 U 0.41 J 0.49 J Selenium T 20 02L ug/I 5 U 5 U 0.32 J 0.5 U 229 0.32 J 0.5 U 0.5 U 0.51 0.34 J Sodium T -- ug/I 61900 67200 21500 5000 U 7110 45300 23200 8850 50100 8760 J- Strontium D ug/I 4390 5360 3270 3340 3540 2020 4030 907 1590 1480 Strontium T -- ug/I 4910 5 U 3320 3400 3540 2080 4400 964 1620 1440 Sulfate N 250000 02L ug/I 683000 652000 690000 25200 94200 595000 154000 59200 300000 44800 Sulfide N -- ug/I 100 U 100 U 100 U 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 1.4 1 U 0.22 J 0.015 J 0.1 U 0.1 U Thallium T 0.2 IMAC ug/I 1 U 1 U 0.11 0.1 U 1.4 0.1 U 0.28 0.079 J 0.1 U 0.1 U Total Dissolved Solids N 500000 02L ug/I 1220000 1230000 5940000 475000 569000 1080000 670000 247000 717000 274000 Total Suspended Solids N -- ug/I 8700 5400 22000 7200 12200 J+ 39600 42000 19800 81600 9600 J+ Uranium, Natural T ug/I 2.3 45.6 -- -- -- -- -- -- -- -- Vanadium D -- ug/I 3 U 7.9 3 U 0.34 49.7 2.8 J 1.1 J 0.38 2.3 0.79 Vanadium T 0.3 IMAC ug/I 3 U 6.4 0.27 J 087 60.4 3.5 1.8 0.49 2.9 0.62 Zinc D -- ug/I 4.8 J 3.8 J 10 U 10 U 4.5 J+ 10 U 10 U 27.5 4.7 J 4 J+ Zinc T 1000 02L ug/I 4.8 J 3.1 12 4.1 J 4.6 J 10 U 3.4 J+ 29.4 J+ 10 U 10 U Dissolved Oxygen N -- mg/I 0.2 0.1 0.4 0.2 0.8 0.3 0.24 0.19 0.1 0.2 Oxidation Reduction Potential N mV -71.8 -202.6 -129.9 -196.1 -25.1 -102.9 -133.3 -91.9 -122.1 -138.6 pH N 6.5 - 8.5 02L SU 7 8.3 7.1 7.7 6.8 6.6 6.9 6.8 6.5 7.1 Specific Conductivity N PS/cm 1555 1418 7646 629 915 1548 1147 424.5 997 421.8 Temperature N Deg C 16.5 16.8 14.2 17.1 17.8 15.8 16.5 17.4 17.5 17.6 Turbidity, field N NTU 16.8 7.9 8 9.9 7.8 1.6 2.89 2.9 8.5 3.9 Marshall Steam Station Page 1 of 4 CSA Supplement 2 Table 3-2: Round 5 Analytical Results of Porewater Monitoring Results Location: AB-10S AB-10SL AB-12S AB-12SL AB-13S AB-14S AB-15S AB-15SL AB-17S AB-18S Date: 4/11/2016 4/11/2016 4/8/2016 4/7/2016 4/7/2016 4/8/2016 4/8/2016 4/8/2016 4/8/2016 4/7/2016 Sample Type: N N N N N N N N N N Sample Name: MA-AB-10S MA-AB-10SL MA-AB-12S MA-AB-12SL MA-AB-13S MA-AB-14S MA-AB-15S MA-AB-15SL MA-AB-17S MA-AB-18S Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit 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 Marshall Steam Station Page 2 of 4 CSA Supplement 2 Table 3-2: Round 5 Analytical Results of Porewater Monitoring Results Location: Date: Sample Type: Sample Name: AB-21S 4/8/2016 N MA-AB-21S AB-3S 4/7/2016 N MA-AB-3S AB-4S 4/7/2016 N MA-AB-4S AB-4SL 4/7/2016 N MA-AB-4SL AB-5S 4/7/2016 N MA -AB -SS AB-6S 4/7/2016 N MA-AB-6S AB-7S 4/7/2016 N MA-AB-7S AB-8S 4/7/2016 N MA-AB-8S AL-3S 4/27/2016 N MA-AL-3S 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 IN ug/I 106000 5000 U 13000 72900 5000 U 346000 241000 73000 112000 Alkalinity, lab IN ug/I 106000 5000 U 13000 72900 5000 U 346000 241000 73000 112000 Aluminum D ug/I 100 U 11500 100 U 228 132000 100 U 100 U 100 U 537 Aluminum T ug/I 100 U 12000 100 U 162 128000 356 100 U 100 U 8280 Antimony D ug/I 5 U 0.17 J 0.2 J 0.27 J 5 U 10 U 28.6 0.5 U 22.7 Antimony T 1 IMAC ug/I 5 U 0.19 J 0.19 J 0.21 J 5 U 10 U 25.5 0.5 U 22.8 Arsenic D -- ug/I 720 0.99 0.28 975 7.8 1630 49.5 137 227 Arsenic T 10 02L ug/I 993 1 0.25 921 9.4 2110 38.4 148 445 Barium D -- ug/I 64.3 16.6 40.8 54.4 25 U 118 35 32.8 34 Barium T 700 02L ug/I 26 17 40.6 54.7 25 U 130 35.2 33.3 152 Beryllium D -- ug/I 1 U 2.9 0.1 U 0.1 U 23 2 U 2 U 0.0911 0.98 J Beryllium T 4 IMAC ug/I 1 U 2.6 0.01 J+ 0.1 U 22.5 0.28 J 2 U 0.097 J 1.9 J Boron D -- ug/I 2360 738 139 456 1200 6050 26600 611 68700 Boron T 700 02L ug/I 1500 766 146 469 1220 6280 27600 634 71400 Cadmium D -- ug/I 0.8 U 0.52 0.08 U 0.08 U 2.6 1.6 U 1.6 U 0.08 U 3.7 Cadmium T 2 02L ug/I 0.8 U 0.55 0.08 U 0.08 U 3.5 1.6 U 1.6 U 0.08 U 4.2 Calcium T -- ug/I 43300 144000 15000 27200 322000 215000 522000 32100 507000 Carbon N -- ug/I 1400 28000 1000 U 1000 U 1000 U 2000 U 550 J 1000 U 1600 Chloride N 250000 02L ug/I 181000 4700 6600 9000 42700 3100 4100 3200 22400 Chromium D -- ug/I 5 U 0.53 0.35 J 0.18 J 41.7 10 U 10 U 0.25 J+ 4.6 J Chromium T 10 02L ug/I 5 U 0.54 J+ 0.33 J+ 0.24 J+ 46.9 10 U 10 U 0.27 J+ 13 Chromium 6+ T 0.07 DHHS ug/I 0.03 U 0.03 U 0.15 0.03 U -- -- 0.03 U 0.03 U 0.19 Cobalt D -- ug/I 17.5 13.7 0.062 J 0.32 160 0.28 J 3.8 19.1 0.94 J Cobalt T 1 IMAC ug/I 4.6 14.3 0.054 J 0.34 170 0.56 J 4.1 18 4.9 Copper D -- ug/I 5 U 64.6 0.94 0.5 U 183 10 U 10 U 0.52 J+ 8 J Copper T 1000 02L ug/I 5 U 62.1 0.15 J 0.5 U 176 6 J 10 U 0.5 U 19.8 Iron D -- ug/I 247000 250 50 U 50 U 2070000 6050 122 34200 407 Iron T 300 02L ug/I 399000 270 50 U 50 U 2140000 7690 224 34100 6560 Lead D -- ug/I 1 U 0.23 0.1 U 0.1 U 1 U 2 U 2 U 0.1 U 3.2 Lead T 15 02L ug/I 1 U 0.24 0.1 U 0.1 U 1 U 2 U 2 U 0.1 U 10.4 Magnesium T -- ug/I 56200 25300 3890 4230 86400 45800 94000 16000 299000 Manganese D -- ug/I 4100 300 35 24.9 23000 1530 2010 1240 107 Manganese T 50 02L ug/I 4630 298 21.1 27.1 22200 1530 2040 1190 130 Mercury D -- ug/I 0.2UJ 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 0.2U Methane N -- ug/I 577 3.1 J+ 1.6 J+ 663 95.1 1090 7.2 J+ 245 10 U Molybdenum D ug/I 5 U 0.46 J 2.4 52.1 5 U 25.7 2520 6.4 36400 Molybdenum T ug/I 5 U 0.48 J 2.3 50.2 5 U 26.4 2490 6.5 33100 Nickel D -- ug/I 13 181 2.8 8.8 330 10 U 19.2 17.4 10 U Nickel T 100 02L ug/I 5.4 202 2.8 8.9 364 10 U 16.3 16.2 11.8 Nitrogen, NO2 plus NO3 N -- ug/I 20 U 350 630 20 U 20 U 20 U 1100 20 U 200 Potassium T ug/I 53800 15300 2660 J 4760 J 3760 J 32200 124000 7060 326000 Selenium D -- ug/I 5 U 9.1 5.2 0.45 J 64.8 10 U 156 0.5 U 49.6 Selenium T 20 02L ug/I 5 U 9.7 5.5 0.42 J 73.7 10 U 150 0.5 U 62.1 Sodium T -- ug/I 16300 10900 5100 9700 11500 15200 47800 10400 198000 Strontium D ug/I 477 2120 204 542 1950 5170 5290 1040 15000 Strontium T -- ug/I 223 2130 206 532 1840 5320 5590 994 14400 Sulfate N 250000 02L ug/I 609000 573000 43300 31300 6420000 501000 1760000 156000 2930000 Sulfide N -- ug/I 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 1 U 3.7 0.32 0.1 U 1 U 0.64 J 4.3 0.43 4.8 Thallium T 0.2 IMAC ug/I 1 U 3.8 0.39 0.1 U 0.38 J 0.8 J 5 0.41 5.3 Total Dissolved Solids N 500000 02L ug/I 1370000 1030000 158000 155000 10900000 1220000 3150000 320000 4620000 Total Suspended Solids N -- ug/I 70500 2700 6700 2500 U 2500 U 2500 U 5000 U 3800 U 523000 Uranium, Natural T ug/I -- -- -- -- -- -- -- -- -- Vanadium D -- ug/I 3 U 0.095 J 0.27 J 1.3 53.4 2.2 J 42.1 0.38 192 Vanadium T 0.3 IMAC ug/I 3 U 0.12 J 0.26 J 1.1 57.9 4.7 J 27.6 0.5 413 Zinc D -- ug/I 24.7 62.3 4 J+ 10 U 1110 2.9 J+ 5.8 J+ 23.4 8.6 J Zinc T 1000 02L ug/I 10 U 63.3 10 U 10 U 1120 4.8 J 5.9 J 20.5 29.9 Dissolved Oxygen N -- mg/I 0.2 0.3 1.2 0.2 0.3 0.4 2.4 0.2 0.7 Oxidation Reduction Potential N mV -72.3 383.8 215 -43.9 332.7 -117.7 58.7 -27.8 61.6 pH N 6.5 - 8.5 02L SU 5.9 4.2 6.1 7.8 3.1 7.2 6.7 6.1 8.3 Specific Conductivity N PS/Cm 2031 1058 161.2 199.2 7083 1408 3018 494 4896 Temperature N Deg C 16.8 20.6 16.9 17.4 17.9 18.7 18.2 15.9 26.6 Turbidity, field N NTU 3 0.5 0.7 0.6 0.1 10 2.4 7.2 153.4 Page 3 of 4 Marshall Steam Station CSA Supplement 2 Table 3-2: Round 5 Analytical Results of Porewater Monitoring Results Location: AB-21S AB-3S AB-4S AB-4SL A113-5S AB-6S AB-7S AB-8S AL-3S Date: 4/8/2016 4/7/2016 4/7/2016 4/7/2016 4/7/2016 4/7/2016 4/7/2016 4/7/2016 4/27/2016 Sample Type: N N N N N N N N N Sample Name: MA-AB-21S MA-AB-3S MA-AB-4S MA-AB-4SL MA -AB -SS MA-AB-6S MA-AB-7S MA-AB-8S MA-AL-3S Constituent Fraction NCDEQ 02L GWQS, IMAC, or DHHS GWQS Source Unit Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCi/L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 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 Marshall Steam Station Page 4 of 4 CSA Supplement 2 Table 3-3: Round S Analytical Results of Surface Water Monitoring Results Location: Date: Sample Type: Sample Name: Event: SW-1 4/11/2016 N MA-SW-1 SW-2 4/11/2016 N MA-SW-2 SW-3 4/11/2016 N MA-SW-3 SW-4 4/11/2016 N MA-SW-4 SW-5 4/11/2016 N MA-SW-5 SW-5 4/11/2016 FD MA-FD-SW-5 SW-6 4/11/2016 N MA-SW-6 SW-7 4/11/2016 N MA-SW-7 SW-8 4/11/2016 N MA-SW-8 SW-9 4/11/2016 N MA-SW-9 SW-10 4/11/2016 N MA-SW-10 Constituent Fraction NCDEQ 02B SWQS (Class B - Water Supply) Unit Alkalinity, CO3 N ug/1 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U 5000 U Alkalinity, HCO3 N ug/I 12800 26500 5000 U 5000 U 5000 U 5000 U 30000 22600 23700 11700 12000 Alkalinity, lab N ug/1 12800 26500 5000 U 5000 U 5000 U 5000 U 30000 22600 23700 11700 12000 Aluminum D -- ug/I 100 U 100 U 14300 10600 10100 10200 100 U 100 U 100 U 55.8 J 100 U Aluminum T 87 ug/I 148 128 18400 J+ 12700 12100 12200 100 U 304 100 U 418 204 Antimony D -- ug/I 5U 5U 5U 5U 5U 5U 0.5U 0.5U 0.5U 0.5U 5U Antimony T 5.6 ug/I 5U 5U 5U 5U 5U 5U 0.5U 0.5U 0.5U 0.5U 5U Arsenic D 150 ug/I 1.3 8.8 28 2.3 2.2 2 0.13 0.078 J 0.068 J 0.17 1.2 Arsenic T 10 ug/I 5.1 19.4 29 3.1 2.5 3 0.18 0.12 0.087 J 0.23 2.6 Barium D -- ug/I 61.2 63.9 33.2 21.1 24.9 25.3 91.4 29.1 28.1 48.7 47.6 Barium T 1000 ug/I 74 76.6 42.3 J+ 25.4 29.9 30.6 106 35.5 32.3 40.7 48.1 Beryllium D 6.5 ug/I 0.23 J 1 U 26.4 2.6 2.4 1.9 0.026 J 0.1 U 0.1 U 0.025 J 1 U Beryllium T -- ug/1 0.27 J 1 U 25 1.7 1.9 2.5 0.1 U 0.05 J+ 0.029 J+ 0.1 U 0.15 J+ Boron D ug/I 6140 5720 250 U 1190 3160 3200 1100 50 U 50 U 172 4340 Boron T -- ug/I 7300 6680 500 U 1490 3760 3750 1280 50 U 50 U 182 3950 Cadmium D 0.15 ug/I 0.8 U 0.8 U 5.3 0.8 U 0.8 U 0.8 U 0.08 U 0.08 U 0.08 U 0.081 0.8 U Cadmium T -- ug/I 0.8 U 0.8 U 5.2 0.8 U 0.8 U 0.8 U 0.08 U 0.08 U 0.08 U 0.068 J 0.8 U Calcium T ug/1 170000 99600 165000 139000 149000 155000 35200 4230 4840 5320 56900 Carbon N -- ug/1 1300 1200 1500 6000 J- 5200 4000 950 J 6500 1100 1100 1200 Chloride N 230000 ug/I 258000 239000 29400 40600 64300 64000 48100 2000 3000 12800 170000 Chromium D 11 ug/I 5 U 5 U 1.6 J 4.2 J 3.3 J 3.2 J 0.46 J+ 0.64 J+ 0.21 J 0.37 J+ 5 U Chromium T -- ug/I 5 U 5 U 1.4 J+ 3.9 J 3.2 J 3.7 J 0.5 J+ 0.4 J+ 0.32 J+ 0.43 J+ 5 U Chromium 6+ T ug/I 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U 0.03 U 0.068 0.03 U 0.023 J 0.011 J- Cobalt D -- ug/I 3.8 2.7 514 23 24.2 22.2 3.1 0.11 1.4 4.1 2.9 Cobalt T 3 ug/I 4.8 3.7 515 22.9 23.5 27.7 3.2 0.21 1.5 3.5 2.8 Copper D 2.7 ug/I 5 U 5 U 38.8 28 23.6 8.1 1.8 0.51 0.94 2.1 5 U Copper T -- ug/1 5 U 2.1 J 24 8.6 7.5 9.6 0.42 J 0.24 J 0.25 J 1.1 5 U Iron D ug/I 52.2 93.7 3590 16300 19700 20100 1930 96 246 50 U 37.9 J Iron T -- ug/I 626 556 4560J+ 20100 23600 23600 2940 570 683 359 392 Lead D 0.54 ug/I 1 U 1 U 3.8 0.9 J 1 U 1 U 0.1 U 0.1 U 0.1 U 0.1 U 1 U Lead T -- ug/I 1U 1U 3.9 1U 1U 1 0.1U 0.3 0.1U 0.38 1U Magnesium T ug/I 62500 59200 64800 24800 35600 35600 17600 1010 1490 3690 33800 Manganese D ug/I 724 831 34500 3600 2450 2480 460 16.9 105 249 658 Manganese T -- ug/I 895 973 42300 2810 2890 2920 531 28.3 123 277 681 Mercury T 0.012 ug/I 0.000773 0.000973 0.000615 0.00543 0.00706 0.00723 0.000618 0.00166 0.000416 J 0.0066 0.00227 Methane N -- ug/I 3.2 J+ 6.7 J+ 2.1 J+ 2.2 J+ 3.3 J+ 0.7 J+ 32.1 5.1 J+ 4.9 J+ 3.8 J+ 2.1 J+ Molybdenum D -- ug/I 11 10 5 U 5 U 3.8 J 3.4 J 0.13 J 0.13 J 0.5 U 0.17 J 6.8 Molybdenum T 160 ug/I 12.4 13.1 5 U 5 U 3.7 J 4 J 0.5 U 0.14 J 0.5 U 0.12 J 6.1 Nickel D 16 ug/I 11.4 9.1 230 J- 36.6 34.7 33.1 2.2 0.5 U 0.64 0.86 7.6 Nickel T 25 ug/I 14.1 11.1 226 34.4 34.4 41.8 2.2 0.5 U 0.5 U 0.5 U 6.3 Nitrogen, NO2 plus NO3 N -- ug/I 430 360 20 U 20 U 20 U 20 U 20 U 140 300 290 370 Potassium T ug/I 5020 5300 50000 U 7230 10400 10300 2710 J 5000 U 5000 U 5000 U 3290 J Selenium D -- ug/I 4.7 J 3.5 J 342 J- 19.2 32.9 30.2 0.8 0.5 U 0.5 U 0.91 5 U Selenium T 5 ug/I 5 U 5 U 318 17.7 33.6 40.1 1.1 0.46 J 0.5 U 1.2 5.7 Sodium T -- ug/I 9880 9950 55200 6090 12400 12200 17900 5930 5620 3980 J 6920 Strontium D -- ug/I 595 653 932 603 718 726 926 46.8 36.2 51.9 422 Strontium T 14000 ug/I 707 770 1250 J+ 717 859 865 1060 54.6 41.5 52.2 385 Sulfate N 250000 ug/I 139000J- 135000 1200000 711000 681000 696000 99900 9101 1500 5100 99400 Sulfide N -- ug/1 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U 100 U Thallium D -- ug/I 0.38 J 1 U 1 U 0.4 J 0.38 J 0.38 J 0.1 U 0.1 U 0.1 U 0.1 U 1 U Thallium T 0.24 ug/I 0.32 J 0.18 J 1 U 0.6 J 0.78 J 0.97 J 0.1 U 0.1 U 0.1 U 0.1 U 1 U Total Dissolved Solids N 500000 ug/I 674000 677000 1470000 906000 932000 980000 246000 25000 U 30000 55000 420000 Total Suspended Solids N -- ug/I 3700 3400 5000 U 8200 5600 7300 5700 9000 2500 U 5400 2600 Vanadium D ug/I 3 U 3 U 3 U 3 U 3 U 3 U 0.45 0.46 0.15 J 0.37 3 U Vanadium T -- ug/I 0.71 J 1.2 J 3 U 3 U 3 U 3 U 0.35 1.1 0.31 0.93 3 U Zinc D 36 ug/I 10.6 7.8 J 612 118 94.6 93.2 5.3 J 10 U 10 U 7 J 8.6 J Zinc T -- ug/I 13.3 11.5 631 J+ 109 102 102 10 U 10 U 10 U 5.8 J 8.3 J Dissolved Oxygen N mg/1 6.94 7.13 5.94 10.3 7.3 7.3 4.77 7.11 7.41 6.4 7.9 Oxidation Reduction Potential N mV 197 182 518.2 529 34.2 34.2 69.4 258.3 125.3 333.7 210.6 pH N 6.0 - 9.0 SU 6.72 5.5 3.04 2.8 2.8 2.8 6.45 7.15 7.07 6.7 6.7 Specific Conductivity N pS/cm 1093 1060 2025 1558 1655 1655 428.4 82.6 69.3 120.2 758 Temperature N I Deg C 1 21.7 18.1 13.7 15.5 17.9 17.9 19.4 16.8 16.4 18.5 18 Turbidity, field N I NTU 1 10.76 1 9.36 1 8.73 1 12.1 1 5.5 1 5.5 1 9.48 1 8.11 1 8.26 1 10.5 17.1 Marshall Steam Station Page 1 of 4 CSA Supplement 2 Table 3-3: Round 5 Analytical Results of Surface Water Monitoring Results Location: SW-1 SW-2 SW-3 SW-4 SW-5 SW-5 SW-6 SW-7 SW-8 SW-9 SW-10 Date: 4/11/2016 4/11/2016 4/11/2016 4/11/2016 4/11/2016 4/11/2016 4/11/2016 4/11/2016 4/11/2016 4/11/2016 4/11/2016 Sample Type: N N N N N FD N N N N N Sample Name: MA-SW-1 MA-SW-2 MA-SW-3 MA-SW-4 MA-SW-5 MA-FD-SW-5 MA-SW-6 MA-SW-7 MA-SW-8 MA-SW-9 MA-SW-10 Event: NCDEQ 02B SWQS Ir Constituent Fraction (Class B - Water Unit Supply) Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCi/L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 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 Marshall Steam Station Page 2 of 4 CSA Supplement 2 Table 3-3: Round S Analytical Results of Surface Water Monitoring Results Location: Date: Sample Type: Sample Name: Event: SW-1 4/11/2016 N MA-SW-1 SW-11 4/11/2016 N MA-SW-11 Constituent Fraction NCDEQ 02B SWQS (Class B - Water Supply) Unit Alkalinity, CO3 N ug/I 5000 U 5000 U Alkalinity, HCO3 N ug/1 12800 11800 Alkalinity, lab N ug/1 12800 11800 Aluminum D -- ug/I 100 U 100 U Aluminum T 87 ug/I 148 171 Antimony D -- ug/I 5 U 0.1 J Antimony T 5.6 ug/I 5 U 0.5 U Arsenic D 150 ug/I 1.3 0.13 Arsenic T 10 ug/I 5.1 0.2 Barium D -- ug/I 61.2 13.9 Barium T 1000 ug/I 74 17.8 Beryllium D 6.5 ug/I 0.23 J 0.1 U Beryllium T -- ug/I 0.27 J 0.1 U Boron D ug/I 6140 71.7 Boron T -- ug/I 7300 79.2 Cadmium D 0.15 ug/I 0.8 U 0.08 U Cadmium T -- ug/I 0.8 U 0.08 U Calcium T ug/1 170000 4280 Carbon N -- ug/1 1300 1100 Chloride N 230000 ug/I 258000 5500 Chromium D 11 ug/I 5 U 0.3 J+ Chromium T -- ug/1 5 U 0.27 J+ Chromium 6+ T ug/I 0.03 U 0.028 J Cobalt D -- ug/I 3.8 0.074 J Cobalt T 3 ug/I 4.8 0.12 Copper D 2.7 ug/I 5 U 0.93 Copper T -- ug/1 5 U 0.95 Iron D ug/I 52.2 33.2 J Iron T -- ug/I 626 208 Lead D 0.54 ug/I 1 U 0.1 U Lead T -- ug/I 1 U 0.1 U Magnesium T ug/I 62500 1890 Manganese D ug/I 724 39 Manganese T -- ug/I 895 59.8 Mercury T 0.012 ug/I 0.000773 0.0008 Methane N -- ug/I 3.2 J+ 3.2 J+ Molybdenum D -- ug/1 11 0.22 J Molybdenum T 160 ug/I 12.4 0.22 J Nickel D 16 ug/I 11.4 0.52 Nickel T 25 ug/I 14.1 0.5 U Nitrogen, NO2 plus NO3 N -- ug/1 430 290 Potassium T ug/I 5020 5000 U Selenium D -- ug/I 4.7 J 0.5 U Selenium T 5 ug/I 5 U 0.5 U Sodium T -- ug/I 9880 3580 J Strontium D -- ug/I 595 25.4 Strontium T 14000 ug/I 707 30.8 Sulfate N 250000 ug/I 139000 J- 4000 Sulfide N -- ug/1 100 U 100 U Thallium D -- ug/I 0.38 J 0.1 U Thallium T 0.24 ug/I 0.32 J 0.1 U Total Dissolved Solids N 500000 ug/I 674000 25000 U Total Suspended Solids N -- ug/I 3700 2500 U Vanadium D ug/I 3 U 0.22 J Vanadium T -- ug/I 0.71 J 0.48 Zinc D 36 ug/I 10.6 10 U Zinc T -- ug/I 13.3 10 U Dissolved Oxygen N mg/1 6.94 8.1 Oxidation Reduction Potential N mV 197 261.4 pH N 6.0 - 9.0 SU 6.72 6.8 Specific Conductivity N PS/cm 1093 87.5 Temperature N Deg C 21.7 17.9 Turbidity, field N I NTU 1 10.76 1 7.1 Page 3 of 4 Marshall Steam Station CSA Supplement 2 Table 3-3: Round 5 Analytical Results of Surface Water Monitoring Results Location: SW-1 SW-11 Date: 4/11/2016 4/11/2016 Sample Type: N N Sample Name: MA-SW-1 MA-SW-11 Event: NCDEQ 02B SWQS Constituent Fraction (Class B - Water Unit :::Am Supply) Notes: pm = micron pg/L = micrograms per liter pS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter my = millivolts NTU - nephelometric turbidity units pCi/L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02B = North Carolina surface water standards as specified in T15 NCAC 02B .0211 and .0216 (amended effective January 2015) 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard T = total TDS = total dissolved solids TOC = total organic carbon Page 4 of 4 Marshall Steam Station CSA Supplement 2 Table 3-4: Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation AB-10D 7/23/2015 802.68 13.64 789.04 9/28/2015 13.6 789.08 6/22/2016 12.73 789.95 AB-10S 7/23/2015 802.41 13.25 789.16 9/28/2015 13.31 789.10 6/22/2016 11.57 790.84 AB-10SL 7/23/2015 802.52 13.54 788.98 9/28/2015 13.55 788.97 6/22/2016 12.35 790.17 AB-11D 7/23/2015 799.95 4.85 795.10 9/28/2015 6.26 793.69 6/22/2016 2.82 797.13 AB-11S 7/23/2015 800.05 6.87 793.18 9/28/2015 7.35 792.70 6/22/2016 4.34 795.71 AB-12D 7/22/2015 795.44 4.59 790.85 9/28/2015 4.35 791.09 6/22/2016 3.92 791.52 AB-12S 7/22/2015 795.68 4.92 790.76 9/28/2015 5.20 790.48 6/22/2016 5.39 790.29 AB-12SL 7/22/2015 795.73 5.17 790.56 9/28/2015 4.77 790.96 6/22/2016 5.12 790.61 AB-13D 7/22/2015 824.55 26.88 797.67 9/28/2015 27.45 797.10 6/22/2016 26.25 798.30 AB-13S 7/22/2015 823.73 26.43 797.30 9/28/2015 27.10 796.63 6/22/2016 24.96 798.77 AB-14D 7/22/2015 824.06 14.60 809.46 9/28/2015 16.02 808.04 6/22/2016 13.25 810.81 AB-14S 7/22/2015 824.68 16.03 808.65 9/28/2015 17.51 807.17 6/22/2016 11.88 812.80 AB-15BR 7/23/2015 823.01 18.98 804.03 9/28/2015 18.39 804.62 6/22/2016 15.61 807.40 AB-15D 7/23/2015 823.04 20.29 802.75 9/28/2015 21.48 801.56 6/22/2016 19.52 803.52 AB-15S 7/23/2015 823.06 18.81 804.25 9/28/2015 20.20 802.86 6/22/2016 18.50 804.56 AB-15SL 7/23/2015 823.10 22.28 800.82 9/28/2015 22.98 800.12 6/22/2016 21.69 801.41 Marshall Steam Station Page 1 of 7 CSA Supplement 2 Table 3-4: Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation AB-16D 7/22/2015 822.45 8.50 813.95 9/28/2015 10.56 811.89 6/22/2016 6.03 816.42 AB-16S 7/22/2015 822.08 7.82 814.26 9/28/2015 10.44 811.64 6/22/2016 5.75 816.33 AB-17D 7/22/2015 833.56 14.60 818.96 9/28/2015 15.46 818.10 6/22/2016 14.05 819.51 AB-17S 7/22/2015 833.29 14.88 818.41 9/28/2015 15.57 817.72 6/22/2016 14.50 818.79 AB-18D 7/22/2015 825.25 7.34 817.91 9/28/2015 7.75 817.50 6/22/2016 7.40 817.85 AB-18S 7/22/2015 825.40 7.71 817.69 9/28/2015 8.04 817.36 6/22/2016 7.79 817.61 AB-1BR 7/22/2015 777.21 6.05 771.16 9/28/2015 4.25 772.96 6/22/2016 2.96 774.25 AB-1D 7/22/2015 777.09 7.01 770.08 9/28/2015 7.65 769.44 6/22/2016 6.40 770.69 AB-1S 7/22/2015 777.27 10.17 767.10 9/28/2015 10.51 766.76 6/22/2016 9.40 767.87 AB-20D 7/22/2015 892.35 64.87 827.48 9/28/2015 64.95 827.40 6/22/2016 65.71 826.64 AB-20S 7/22/2015 892.48 63.12 829.36 9/28/2015 63.50 828.98 6/22/2016 63.81 828.67 AB-21D 7/22/2015 810.15 17.78 792.37 9/28/2015 17.67 792.48 6/22/2016 16.96 793.19 AB-21S 7/22/2015 810.66 19.36 791.30 9/28/2015 19.54 791.12 6/22/2016 18.88 791.78 AB-2D 7/22/2015 781.44 14.84 766.60 9/28/2015 15.95 765.49 6/22/2016 13.34 768.10 AB-2S 7/22/2015 781.30 20.59 760.71 9/28/2015 21.77 759.53 6/22/2016 18.00 763.30 AB-3D 7/22/2015 814.98 17.80 797.18 9/28/2015 18.03 796.95 6/22/20161 17.53 797.45 Marshall Steam Station Page 2 of 7 CSA Supplement 2 Table 3-4: Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation AB-3S 7/22/2015 815.06 16.60 798.46 9/28/2015 17.27 797.79 6/22/2016 16.74 798.32 AB-4D 7/22/2015 809.94 10.40 799.54 9/28/2015 16.10 793.84 6/22/2016 15.82 794.12 AB-4S 7/22/2015 809.73 10.12 799.61 9/28/2015 10.00 799.73 6/22/2016 10.32 799.41 AB-4SL 7/22/2015 809.85 10.49 799.36 9/28/2015 10.50 799.35 6/22/2016 10.70 799.15 AB-5BR 7/22/2015 807.55 8.30 799.25 9/28/2015 7.95 799.60 6/22/2016 8.30 799.25 AB-5D 7/22/2015 807.52 8.18 799.34 9/28/2015 7.25 800.27 6/22/2016 7.67 799.85 AB-5S 7/22/2015 807.55 8.05 799.50 9/28/2015 7.26 800.29 6/22/2016 7.63 799.92 AB-6BR 7/22/2015 835.77 18.67 817.10 9/28/2015 20.10 815.67 6/22/2016 15.66 820.11 AB-6D 7/22/2015 835.36 17.50 817.86 9/28/2015 18.93 816.43 6/22/2016 14.49 820.87 AB-6S 7/22/2015 835.40 15.60 819.80 9/28/2015 16.97 818.43 6/22/2016 12.33 823.07 AB-7D 7/22/2015 834.13 20.80 813.33 9/28/2015 22.28 811.85 6/22/2016 17.80 816.33 AB-7S 7/22/2015 834.22 20.12 814.10 9/28/2015 21.90 812.32 6/22/2016 16.77 817.45 AB-8D 7/22/2015 800.50 36.10 764.40 9/28/2015 8.51 791.99 6/22/2016 8.38 792.12 AB-8S 7/22/2015 800.33 34.19 766.14 9/28/2015 8.29 792.04 6/22/2016 8.59 791.74 AB-9BR 7/22/2015 797.64 7.02 790.62 9/28/2015 7.05 790.59 6/22/2016 7.73 789.91 AB-9D 7/22/2015 797.29 7.95 789.34 9/28/2015 7.97 789.32 6/22/20161 7.401 789.89 Marshall Steam Station Page 3 of 7 CSA Supplement 2 Table 3-4: Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation AB-9S 7/22/2015 797.81 8.03 789.78 9/28/2015 8.08 789.73 6/22/2016 7.28 790.53 AL-11D 7/22/2015 818.13 44.22 773.91 9/28/2015 44.43 773.70 6/22/2016 -- -- AL-1S 7/22/2015 818.00 39.26 778.74 9/28/2015 39.55 778.45 6/22/2016 -- -- AL-2BR 7/23/2015 912.78 111.47 801.31 9/28/2015 111.86 800.92 6/22/2016 111.04 801.74 AL-21D 7/23/2015 912.65 113.66 798.99 9/28/2015 113.95 798.70 6/22/2016 113.15 799.50 AL-2S 7/23/2015 912.45 115.23 797.22 9/28/2015 115.51 796.94 6/22/2016 114.76 797.69 AL-3D 7/23/2015 915.72 113.39 802.33 9/28/2015 114.31 801.41 6/22/2016 112.44 803.28 AL-3S 7/23/2015 915.45 112.61 802.84 9/28/2015 113.47 801.98 6/22/2016 111.51 803.94 AL-4D 7/23/2015 915.78 105.69 810.09 9/28/2015 106.03 809.75 6/22/2016 105.62 810.16 BG-1BR 817.94 -- -- -- 6/22/2016 18.26 799.68 BG-1D 7/22/2015 815.01 12.59 802.42 9/28/2015 13.54 801.47 6/22/2016 10.14 804.87 BG-1S 7/22/2015 814.92 9.82 805.10 9/28/2015 12.95 801.97 6/22/2016 9.72 805.20 BG-2BR 7/22/2015 814.81 7.60 807.21 9/28/2015 8.43 806.38 6/22/2016 5.96 808.85 BG-2S 7/22/2015 814.33 3.00 811.33 9/28/2015 7.05 807.28 6/22/2016 5.30 809.03 BG-3BR 867.69 -- -- -- 6/22/2016 34.62 833.07 BG-3D 7/22/2015 864.18 27.98 836.20 9/28/2015 30.45 833.73 6/22/2016 26.41 837.77 Marshall Steam Station Page 4 of 7 CSA Supplement 2 Table 3-4: Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation BG-3S 7/22/2015 863.03 29.64 833.39 9/28/2015 31.82 831.21 6/22/2016 26.91 836.12 GWA-10D 778.10 -- -- -- 6/22/2016 could not access -- GWA-10S 777.65 -- -- -- 6/22/2016 could not access -- GWA-11D 811.24 -- -- -- 6/22/2016 46.99 764.25 GWA-11S 812.55 -- -- -- 6/22/2016 45.91 766.64 GWA-1BR 7/22/2015 806.10 41.76 764.34 9/28/2015 42.42 763.68 6/22/2016 40.95 765.15 GWA-1D 7/22/2015 806.05 45.27 760.78 9/28/2015 45.13 760.92 6/22/2016 43.56 762.49 GWA-1S 7/22/2015 805.97 45.13 760.84 9/28/2015 46.26 759.71 6/22/2016 44.11 761.86 GWA-2D 7/23/2015 826.72 24.00 802.72 9/28/2015 25.43 801.29 6/22/2016 21.26 805.46 GWA-2S 7/23/2015 826.95 23.83 803.12 9/28/2015 25.30 801.65 6/22/2016 21.12 805.83 GWA-3D 7/22/2015 839.44 6.64 832.80 9/28/2015 6.78 832.66 6/22/2016 6.15 833.29 GWA-3S 7/22/2015 839.24 9.15 830.09 9/28/2015 9.25 829.99 6/22/2016 8.87 830.37 GWA-4D 7/22/2015 899.34 59.00 840.34 9/28/2015 59.47 839.87 6/22/2016 57.68 841.66 GWA-4S 7/22/2015 901.97 58.40 843.57 9/28/2015 59.08 842.89 6/22/2016 57.88 844.09 GWA-5D 7/22/2015 847.17 34.38 812.79 9/28/2015 34.94 812.23 6/22/2016 33.78 813.39 GWA-5S 7/22/2015 847.22 34.65 812.57 9/28/2015 35.28 811.94 6/22/20161 33.99 813.23 Marshall Steam Station Page 5 of 7 CSA Supplement 2 Table 3-4: Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation GWA-6D 7/22/2015 845.72 43.02 802.70 9/28/2015 44.25 801.47 6/22/2016 41.72 804.00 GWA-6S 7/22/2015 845.37 42.43 802.94 9/28/2015 43.68 801.69 6/22/2016 41.15 804.22 GWA-7D 7/22/2015 812.50 12.51 799.99 9/28/2015 14.05 798.45 6/22/2016 8.92 803.58 GWA-7S 7/22/2015 810.72 13.70 797.02 9/28/2015 15.48 795.24 6/22/2016 9.71 801.01 GWA-8D 7/22/2015 853.68 36.10 817.58 9/28/2015 37.48 816.20 6/22/2016 34.88 818.80 GWA-8S 7/22/2015 852.90 34.19 818.71 9/28/2015 35.45 817.45 6/22/2016 33.15 819.75 GWA-9BR 7/22/2015 848.45 2.07 846.38 9/28/2015 3.45 845.00 6/22/2016 0.60 847.85 MS-10 7/23/2015 851.29 dry -- -- -- -- 6/22/2016 17.07 834.22 MW-10D 7/23/2015 772.04 16.80 755.24 M W-10S 7/23/2015 772.05 17.30 754.75 MW-11D 7/23/2015 884.67 44.54 840.13 MW-11S 7/23/2015 884.99 44.87 840.12 MW-12D 7/23/2015 871.88 16.69 855.19 MW-12S 7/23/2015 871.86 16.40 855.46 MW-13D 7/23/2015 847.05 3.99 843.06 M W-13S 7/23/2015 847.49 6.13 841.36 Marshall Steam Station Page 6 of 7 CSA Supplement 2 Table 3-4: Groundwater Elevations Well Identification Date Top of Casing (TOC) Depth to Water (DTW) Groundwater Elevation MW-14BR 7/22/2015 810.31 36.71 773.60 9/28/2015 37.13 773.18 6/22/2016 35.56 774.75 MW-14D 7/22/2015 811.43 38.82 772.61 9/28/2015 40.82 770.61 MW-14S 7/22/2015 811.29 38.23 773.06 9/28/2015 39.30 771.99 MW-4 7/23/2015 867.15 37.16 829.99 9/28/2015 40.42 826.73 6/22/2016 36.42 830.73 MW-4D 7/23/2015 866.74 37.64 829.10 9/28/2015 34.73 832.01 6/22/2016 36.35 830.39 MW-6D 7/23/2015 791.19 22.19 769.00 9/28/2015 22.72 768.47 6/22/2016 20.60 770.59 MW-6S 7/23/2015 790.35 24.04 766.31 9/28/2015 24.53 765.82 6/22/2016 22.39 767.96 MW-7D 7/23/2015 776.85 8.09 768.76 9/28/2015 8.82 768.03 6/22/2016 6.98 769.87 MW-7S 7/23/2015 775.99 14.40 761.59 9/28/2015 15.25 760.74 6/22/2016 13.35 762.64 MW-8D 7/23/2015 775.18 16.07 759.11 9/28/2015 17.70 757.48 6/22/2016 14.39 760.79 MW-8S 7/23/2015 775.34 18.25 757.09 9/28/2015 20.06 755.28 6/22/2016 16.50 758.84 MW-9D 7/23/2015 777.38 19.22 758.16 9/28/2015 21.08 756.30 6/22/2016 17.45 759.93 MW-9S 7/23/2015 777.34 17.93 759.41 9/28/2015 20.15 757.19 6/22/2016 15.55 761.79 OB-1 7/23/2015 825.85 46.42 779.43 -- -- -- 6/22/2016 47.131 778.72 Marshall Steam Station Page 7 of 7 CSA Supplement 2 Table 3-5: Summary of Cation -Anion Balance Differences Anions Cations Constituent: Molecular Weight (g/mol) Charge Equivalent Weight: Site Location Matrix Date Alkalinity, CO3 Alkalinity, HCO3 Chloride NitrogenO2 N , plus Sulfate Sum of Anions Calcium Magnesium Potassium Sodium Sum of Cations Charge Balance (%) 60 61 35.5 62 96.1 40.1 24.3 39.1 23 2 1 1 1 2 2 2 1 1 30 61 35.5 62 48.05 20.05 12.15 39.1 23 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 Marshall 0 1 0.21 258 7.268 139 170 0.128 9.88 0.43 14.181 15.5% SW-1 Surface Water 4/11/2016 0 12.8 0.43 0.007 2.893 10.378 8.479 62.5 5.144 5.02 SW-2 Surface Water 4/11/2016 0 0 26.5 0.434 239 6.732 0.36 0.006 135 2.81 9.982 99.6 4.968 59.2 4.872 5.3 0.136 9.95 0.433 1 10.409 2.1% SW-3 Surface Water 4/11/2016 0 0 0 0 29.4 0.828 0 0 1200 24.974 25.802 165 8.229 64.8 5.333 0 0 55.2 2.4 15.962 -23.6% SW-4 Surface Water 4/11/2016 0 0 0 0 40.6 1.144 0 0 711 14.797 15.941 139 6.933 24.8 2.041 7.23 0.185 6.09 0.265 9.424 -25.7% SW-5 Surface Water 4/11/2016 0 0 0 0 64.3 1.811 0 0 681 14.173 15.984 149 7.431 35.6 2.93 10.4 0.266 12.4 0.539 11.166 -17.7% SW-6 Surface Water 4/11/2016 0 0 30 1 0.492 48.1 1.355 0 0 99.9 2.079 3.926 35.2 1.756 17.6 1.449 2.71 0.069 17.9 0.778 4.052 1.6% SW-7 Surface Water 4/11/2016 0 0 22.6 0.37 2 0.056 0.14 0.002 1 0.91 0.019 1 0.447 4.23 0.211 1 1.01 0.083 0 1 0 5.93 1 0.258 0.552 10.5% SW-8 Surface Water 4/11/2016 0 0 23.7 0.389 3 0.085 0.3 0.005 1.5 0.031 0.51 4.84 0.241 1.49 0.123 0 0 5.62 0.244 0.608 8.8% SW-9 Surface Water 4/11/2016 0 0 11.7 0.192 12.8 0.361 0.29 0.005 5.1 0.106 0.664 5.32 0.265 3.69 0.304 0 0 3.98 0.173 0.742 5.5% SW-10 Surface Water 4/11/2016 0 0 12 0.197 170 4.789 0.37 0.006 99.4 2.069 7.061 56.9 2.838 33.8 2.782 3.29 0.084 6.92 0.301 6.005 -8.1% SW-11 Surface Water 4/11/2016 0 0 11.8 0.193 5.5 0.155 0.29 0.005 4 0.083 0.436 4.28 1 0.213 1.89 0.156 0 0 1 3.58 0.156 1 0.525 9.3% AB-10D Groundwater 4/11/2016 0 0 274 4.492 4.8 0.135 0 0 1 5.3 0.11 4.737 73.4 3.661 15.8 1 1.3 4.74 0.121 9.35 0.407 5.489 7.4% AB-11D Groundwater 4/11/2016 0 0 67.8 1.111 2 0.056 0.23 0.004 4 0.083 1.254 17.9 0.893 2.87 0.236 0 0 8.4 0.365 1.494 8.7% AB-11S Groundwater 4/11/2016 0 0 17.8 0.292 1.5 0.042 0.064 0.001 1 0.021 0.356 0.824 0.041 0.358 0.029 3.07 0.079 6.58 0.286 0.435 10.0% AB-12D Groundwater 4/7/2016 0 0 141 2.311 354 9.972 0 0 185 3.85 16.133 207 10.324 7.49 0.616 7.8 0.199 108 4.696 15.835 -0.9% AB-13D Groundwater 4/7/2016 0 0 155 2.541 1.8 0.051 0 0 13.7 0.285 2.877 41.1 2.05 8.4 0.691 5.15 0.132 9.73 0.423 1 3.296 6.8% AB-14D Groundwater 4/8/2016 0 0 38.1 0.625 2 0.056 0.1 0.002 27 0.562 1.245 13.8 0.688 3.84 0.316 0 0 7.91 0.344 1.348 4.0% AB-15BR Groundwater 4/8/2016 0 0 155 2.541 2.2 0.062 0 0 66 1.374 3.977 62.4 3.112 7.85 0.646 4.46 0.114 11.6 0.504 4.376 4.8% AB-15D Groundwater 4/8/2016 0 0 175 2.869 2.6 0.073 0 0 34.5 0.718 3.66 60.1 2.998 7.25 0.597 5.28 0.135 9.58 0.417 4.147 6.2% AB-16D Groundwater 4/8/2016 0 0 121 1.984 6 0.169 0 0 57.3 1.193 3.346 31.5 1.571 8.3 0.683 6.23 0.159 1 33.7 1.465 3.878 7.4% AB-16S Groundwater 4/8/2016 0 1 0 91.2 1.495 5 0.141 0 0 1 20.1 0.418 1 2.054 9.76 0.487 10.1 0.831 0 0 16.9 0.735 2.053 0.0% AB-17D Groundwater 4/8/2016 0 0 51.1 0.838 1.1 0.031 0.061 0.001 0.81 0.017 0.887 9.27 0.462 3.38 0.278 2.5 0.064 6.68 0.29 1.094 1 10.4% AB-18D Groundwater 4/7/2016 0 0 63.8 1.046 1.6 0.045 0.013 0 3.6 0.075 1.166 13.1 0.653 2.95 0.243 0 0 8.5 0.37 1.266 4.1 % AB-1BR Groundwater 4/12/2016 0 0 38.9 0.638 126 3.549 0 0 37.8 0.787 4.974 47.5 2.369 20.3 1.671 5.1 1 0.13 19 1 0.826 4.996 0.2% AB-1D Groundwater 4/11/2016 0 0 26 0.426 187 5.268 0 0 33.3 0.693 6.387 73 3.641 18.8 1 1.547 6.72 0.172 20.6 0.896 6.256 -1.0% AB-1S Groundwater 4/11/2016 0 1 0 3.2 0.052 232 6.535 0 0 1 120 2.497 9.084 95.2 4.748 39.3 3.235 6.09 0.156 7.28 0.317 8.456 -3.6% AB-20D Groundwater 4/12/2016 13.2 0.44 23.8 0.39 3A 0.096 0 0 0.63 0.013 0.939 1 15.5 0.773 0.718 0.059 7.1 0.182 16.3 0.709 1.723 29.5% AB-21 D Groundwater 4/8/2016 0 0 77.3 1.267 8.6 0.242 0 0 6.5 0.135 1.644 12.1 0.603 9.24 0.76 5.84 0.149 9.08 0.395 1.907 7.4% AB-2D Groundwater 4/12/2016 0 0 61.8 1.013 4.8 0.135 0.07 0.001 185 3.85 4.999 59.9 2.988 17.6 1.449 4.53 1 0.116 14.4 0.626 5.179 1.8% AB-2S Groundwater 4/12/2016 0 0 50.9 0.834 7.6 0.214 1.9 0.031 35.9 0.747 1.826 25.5 1.272 1 5.15 0.424 3.26 0.083 6.02 0.262 2.041 5.6% AB-3D Groundwater 4/7/2016 0 0 111 1.82 4.8 0.135 0 0 1 89.7 1.867 3.822 31.5 1.571 16.7 1.374 5.17 0.132 17 0.739 3.816 -0.1 % AB-41D Groundwater 4/7/2016 0 1 0 29.9 0.49 7.3 0.206 0 0 26.7 0.556 1.252 1 9.43 0.47 4.38 0.36 3.93 0.101 9.48 0.412 1.343 3.5% AB-5BR Groundwater 4/7/2016 0 0 236 3.869 2.3 0.065 0 0 92.9 1.933 5.867 40.5 2.02 14.8 1.218 58.7 1.501 39.1 1.7 6.439 4.6% AB-51D Groundwater 4/7/2016 0 0 133 2.18 3.2 0.09 0 0 26.1 0.543 2.813 23.2 1.157 10.6 1 0.872 5.64 1 0.144 14.9 0.648 1 2.821 0.1 % AB-6BR Groundwater 4/7/2016 582 19.4 0 0 2.5 0.07 0.02 0 52 1.082 20.552 87 4.339 0.137 0.011 151 3.862 148 6.435 14.647 -16.8% AB-61D Groundwater 4/7/2016 0 0 262 4.295 3.8 0.107 0 0 40.2 0.837 5.239 81.3 4.055 8.11 0.667 5.92 0.151 10.8 0.47 5.343 1.0% AB-7D Groundwater 4/7/2016 0 1 0 111 1.82 2.4 0.068 0 0 7 0.146 2.034 1 25.6 1.277 3.71 0.305 8.48 0.217 16.6 0.722 2.521 10.7% AB-81D Groundwater 4/7/2016 0 0 96 1.574 2.8 0.079 0 0 90.6 1.886 3.539 50.9 2.539 4.95 0.407 4.67 0.119 14.8 0.643 3.708 2.3% AB-9BR Groundwater 4/8/2016 0 0 107 1.754 3.1 0.087 0 0 70 1.457 3.298 27.6 1.377 2.6 1 0.214 20.5 1 0.524 13.8 0.6 2.715 -9.7% AB-91D Groundwater 4/8/2016 0 0 97.8 1.603 1.8 0.051 0 0 6.3 0.131 1.785 14.4 0.718 10.8 0.889 8.01 0.205 8.3 0.361 2.173 9.8% AB-9S Groundwater 4/8/2016 0 0 24.2 0.397 2.5 0.07 0.69 0.011 6 0.125 0.603 4.18 0.208 5.14 0.423 0 0 2.69 0.117 0.748 10.7% AL-1 D Groundwater 4/12/2016 0 1 0 19.5 0.32 276 7.775 0 0 10.9 0.227 8.322 1 93.9 4.683 23.1 1.901 9.24 0.236 30 1 1.304 8.124 -1.2% AL-1 S Groundwater 4/12/2016 0 0 0 0 209 5.887 0.11 0.002 96.4 2.006 7.895 56.3 2.808 40.1 3.3 18.8 0.481 9.94 0.432 7.021 -5.9% AL-2BR Groundwater 4/11/2016 7 0.233 21 0.344 3.3 0.093 0 0 174 3.621 4.291 31.6 1 1.576 6.61 0.544 37 0.946 28.4 1.235 4.301 0.1% AL-21D Groundwater 4/11/2016 0 0 1 57.4 0.941 2.4 0.068 2.4 0.039 606 12.612 13.66 168 8.379 45.3 3.728 9.86 0.252 45.2 1.965 14.324 2.4% Page 1 of 3 Marshall Steam Station CSA Supplement 2 Table 3-5: Summary of Cation -Anion Balance Differences Anions Cations Constituent: Molecular Weight (g/mol) Charge Equivalent Weight: Site Location Matrix Date Alkalinity, CO3 Alkalinity, HCO3 Chloride Nitrogen02 N , plus Sulfate Sum of Anions Calcium Magnesium Potassium Sodium Sum of Cations Charge Balance (%) 60 61 35.5 62 96.1 40.1 24.3 39.1 23 2 1 1 1 2 2 2 1 1 30 61 1 35.5 62 48.05 20.05 12.15 39.1 23 Result 1 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 AL-2S Groundwater 4/8/2016 AL-31D Groundwater 4/11/2016 0 0 17.4 0.285 1.484 1.6 0.045 1.7 0.027 1210 25.182 25.539 267 13.317 80.5 6.626 8.94 0.229 69.6 3.026 23.198 -4.8% 0 0 90.5 3 0.085 0 0 367 7.638 9.207 99.5 4.963 30.1 2.477 18.3 0.468 32.6 1.417 9.325 0.6% AL-41D Groundwater 4/8/2016 0 0 33.3 0.546 2.2 0.062 1.4 0.023 1 587 12.216 12.847 1 140 6.983 48.4 3.984 10.8 0.276 32.2 1.4 1 12.643 -0.8% BG-1 BR Groundwater 4/29/2016 0 0 92.4 1.515 2.1 0.059 0.24 0.004 5.5 0.114 1.692 17.7 0.883 7.47 0.615 6.45 0.165 11.5 0.5 2.163 12.2% BG-1 D Groundwater 3/15/2016 0 0 76.3 1.251 3.3 0.093 0.95 0.015 13.8 0.287 1.646 12.1 0.603 7.32 0.602 4.85 0.124 13 0.565 1.894 7.0% BG-1 S Groundwater 3/15/2016 0 0 8.2 0.134 1 0.028 3.9 0.063 9.5 0.198 0.423 3.76 0.188 5.57 0.458 0 0 0 0 0.646 20.9% BG-2BR Groundwater 3/28/2016 0 0 86.3 1.415 2.5 0.07 0.23 0.004 2.2 0.046 1.535 14.9 0.743 9.37 0.771 6.06 0.155 8.03 0.349 2.018 13.6% BG-2S Groundwater 3/28/2016 0 0 71.4 1.17 2.5 0.07 0.37 0.006 6.7 0.139 1.385 15.3 0.763 6.94 0.571 3.53 0.09 9.19 0.4 1 1.824 13.7% BG-3BR Groundwater 4/13/2016 0 0 108 1.77 2.4 0.068 0.067 0.001 10.5 0.219 2.058 13.6 0.678 12.9 1.062 8.2 0.21 13.4 0.583 2.533 10.3% BG-313 Groundwater 3/15/2016 0 0 115 1.885 2.4 0.068 0.23 0.004 11.7 0.243 2.2 10.9 0.544 14.3 1.177 7.39 0.189 15.1 0.657 2.567 7.7% BG-3S Groundwater 3/15/2016 0 1 0 73.2 1.2 2.1 0.059 0.12 0.002 10.8 0.225 1.486 7.37 0.368 11.2 0.922 4.72 0.121 8.15 0.354 1.765 8.6% GWA-10D Groundwater 4/11/2016 0 0 58.6 0.961 1.2 0.034 0 0 1 204 4.246 5.241 1 46.3 2.309 26A 2.148 6.18 0.158 14.4 0.626 5.241 0.0% GWA-10S Groundwater 4/27/2016 0 0 27.5 0.451 2.6 0.073 0 0 17.4 0.362 0.886 5.97 0.298 3 0.247 0 0 11.5 0.5 1.045 8.2% GWA-11 D Groundwater 4/12/2016 0 0 49.4 0.81 3.4 0.096 0.039 0.001 94.3 1.963 2.87 27 1.347 9.18 0.756 4.48 0.115 14.8 0.643 2.861 -0.2% GWA-11 S Groundwater 4/27/2016 0 0 22.1 0.362 2.8 0.079 0.24 0.004 261 5.432 5.877 57.6 2.873 21.1 1 1.737 7.95 0.203 31.1 1.352 6.165 2.4% GWA-12BR Groundwater 6/2/2016 0 1 0 32 0.525 2.7 0.076 0.049 0.001 15 0.312 0.914 8.74 0.436 1.77 0.146 4.59 0.117 11.6 0.504 1.203 13.7% GWA-12D Groundwater 6/3/2016 0 0 16.2 0.266 2.4 0.068 3.2 0.052 1 11.7 0.243 0.629 1 5.68 0.283 1.7 0.14 3.3 0.084 11.3 0.491 0.998 22.7% GWA-12S Groundwater 6/1/2016 0 0 2.9 0.048 1.5 0.042 0.92 0.015 1.9 0.04 0.145 0.616 0.031 0.567 0.047 0 0 3.08 0.134 0.212 18.8% GWA-13S Groundwater 6/10/2016 0 0 5.1 0.084 4.1 0.115 0.075 0.001 4.4 0.092 0.292 0.877 0.044 1.03 0.085 0 0 4.08 0.177 0.306 2.3% GWA-1 BR Groundwater 4/12/2016 0 0 35.6 0.584 3 0.085 0.61 0.01 58.3 1.213 1.892 19.7 0.983 6.94 1 0.571 3.56 0.091 11.1 0.483 2.128 5.9% GWA-1 D Groundwater 4/12/2016 0 1 0 49.3 0.808 2 0.056 0 0 236 1 4.912 5.776 66.9 3.337 22.1 1.819 7.69 1 0.197 18.6 0.809 1 6.162 3.2% GWA-1 S Groundwater 4/12/2016 0 0 15 1 0.246 2.7 0.076 0.43 0.007 4.4 0.092 0.421 1 1.61 0.08 0.468 0.039 0 0 8.2 0.357 0.476 6.1 % GWA-2D Groundwater 4/8/2016 228 7.6 45.1 0.739 6.7 0.189 0 0 96.3 2.004 10.532 96.7 4.823 0 0 4.34 0.111 63.1 2.743 7.677 1 -15.7% GWA-2S Groundwater 4/8/2016 0 0 2.4 0.039 1.4 0.039 0.017 0 89.5 1.863 1.941 12 0.599 13.9 1.144 3.01 0.077 0 0 1.82 -3.2% GWA-3D Groundwater 4/11/2016 0 0 53.2 0.872 1.7 0.048 0.13 0.002 3.1 0.065 0.987 13.1 0.653 2.02 1 0.166 0 0 7.84 0.341 1.16 8.1% GWA-3S Groundwater 4/11/2016 0 1 0 29.3 0.48 1.9 0.054 0.4 0.006 1.1 0.023 0.563 4.57 0.228 1.18 0.097 0 0 7.89 0.343 0.668 8.5% GWA-4D Groundwater 4/12/2016 0 0 120 1 1.967 4.2 0.118 0 0 35.4 0.737 2.822 1 31.9 1.591 5.01 0.412 3.95 1 0.101 26.1 1 1.135 3.239 6.9% GWA-4S Groundwater 4/12/2016 0 0 20.8 0.341 3 0.085 0.92 0.015 0.75 0.016 0.457 4.3 0.214 1.16 0.095 0 0 5.46 0.237 0.546 1 8.9% GWA-5D Groundwater 4/12/2016 0 0 12.8 0.21 1.3 0.037 0.71 0.011 3 0.062 0.32 2.49 0.124 0.778 0.064 0 0 5.01 0.218 0.406 11.8% GWA-6D Groundwater 4/12/2016 0 0 81.5 1.336 4 0.113 0.048 0.001 15.6 0.325 1.775 18.8 0.938 2.79 1 0.23 4.04 0.103 18.1 0.787 2.058 7.4% GWA-6S Groundwater 4/12/2016 0 1 0 18.6 0.305 2.8 0.079 0.078 0.001 0.8 0.017 0.402 2.93 0.146 0.668 0.055 0 0 5.58 0.243 0.444 5.0% GWA-7D Groundwater 4/12/2016 0 0 83.1 1 1.362 2.5 0.07 0.28 0.005 9 0.187 1.624 1 8.84 0.441 13.3 1.095 6.92 1 0.177 6.41 1 0.279 1.992 10.2% GWA-7S Groundwater 4/12/2016 0 0 91.9 1.507 3.4 0.096 0.047 0.001 10.6 0.221 1.825 11.2 0.559 15.2 1.251 4.14 0.106 6.99 0.304 2.22 9.8% GWA-8D Groundwater 4/12/2016 0 0 34.5 0.566 2.4 0.068 0.28 0.005 0.92 0.019 0.658 5.85 0.292 1.54 0.127 0 0 7.55 0.328 0.747 6.3% GWA-8S Groundwater 4/12/2016 0 0 30.8 0.505 3.9 0.11 0 0 4.2 0.087 0.702 6.34 0.316 1.48 1 0.122 0 0 7.46 0.324 0.762 4.1 % GWA-9BR Groundwater 4/11/2016 0 1 0 38.6 0.633 4.2 0.118 1.8 0.029 1 0.021 0.801 8.93 0.445 2.84 0.234 0 0 7.2 0.313 0.992 10.7% MS-10 Groundwater 3/15/2016 0 0 3 1 0.049 1.1 0.031 0.71 0.011 1 0.6 0.012 0.103 1 0.236 0.012 0.377 0.031 0 1 0 0 1 0 0.043 -41.1 % MW-4 Groundwater 3/15/2016 0 0 19.3 0.316 1.7 0.048 0.026 0 0.65 0.014 0.378 3.45 0.172 0.69 0.057 0 0 4.32 0.188 0.417 4.9% MW-4D Groundwater 3/15/2016 0 0 35.7 0.585 1.3 0.037 0.034 0.001 1.8 0.037 0.66 6.12 0.305 1.37 0.113 0 0 8.11 0.353 0.771 7.8% MW-613 Groundwater 4/11/2016 0 0 30.2 0.495 81.1 2.285 0 0 6.2 0.129 2.909 27.4 1.367 9.5 1 0.782 4.09 0.105 13.4 0.583 1 2.837 -1.3% MW-6S Groundwater 4/11/2016 0 1 0 0 0 219 6.169 0.29 0.005 112 2.331 8.505 55.6 2.773 40.7 3.35 5.3 0.136 6.64 0.289 6.548 -13.0% MW-7D Groundwater 4/11/2016 0 0 87.7 1.438 1 67.8 1.91 0 0 85.1 1.771 5.119 80.6 1 4.02 7.81 0.643 3.78 1 0.097 12.6 0.548 5.308 1.8% MW-7S Groundwater 4/11/2016 0 0 0 0 198 5.577 0.57 0.009 113 2.352 7.938 72.6 3.621 31.6 2.601 3.47 0.089 6.3 0.274 6.585 -9.3% MW-813 Groundwater 4/11/2016 0 0 124 2.033 6.2 0.175 0 0 109 2.268 4.476 75.2 3.751 4.68 0.385 2.91 0.074 10.5 0.457 4.667 2.1% MW-8S Groundwater 4/11/2016 0 0 414 6.787 2.3 0.065 0 0 46.8 0.974 7.826 132 6.58 5. 1 2.123 7.85 0.201 1 14.3 1 0.622 1 9.53 1 9.8% MW-9D Groundwater 4/11/20161 0 0 1 35.2 1 0.577 6 0.169 0 0 1 176 3.663 1 4.409 1 60.8 3.032 9.23 1 0.76 1 3.86 0.099 1 12.4 1 0.539 1 4.43 1 0.2% Marshall Steam Station CSA Supplement 2 Page 2 of 3 Table 3-5: Summary of Cation -Anion Balance Differences Anions Cations Constituent: Molecular Weight (g/mol) Charge Equivalent Weight: Site Location Matrix Date Alkalinity, CO3 Alkalinity, HCO3 Chloride NitrogenO2 N , plus Sulfate Sum of Anions Calcium Magnesium Potassium Sodium Sum of Cations Charge Balance (%) 60 61 35.5 62 96.1 40.1 24.3 39.1 23 2 1 1 1 2 2 2 1 1 30 61 1 35.5 1 62 48.05 20.05 12.15 39.1 23 Result 1 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 MW-9S Groundwater 4/11/2016 0 0 211 3.459 10.8 0.304 1.8 0.029 51.8 1.078 4.87 64.6 3.222 13.9 1.144 4.77 0.122 27.9 13.2 1.213 5.701 7.9% MW-14BR Groundwater 4/12/2016 0 0 63.2 1.036 20.6 0.58 0.2 0.003 9.7 0.202 1.821 16.1 0.803 6.81 0.56 3.96 0.101 0.574 2.038 5.6% OB-1 Groundwater 4/8/2016 0 0 9.1 0.149 1.5 0.042 0 0 1 0 0 0.191 1 2.04 0.102 1 0.346 0.028 0 0 0 0 0.13 -19.0% AB-10S Porewater 4/11/2016 0 0 144 2.361 4.9 0.138 0 0 683 14.214 16.713 193 9.626 41.3 3.399 80.6 1 2.061 61.9 2.691 17.777 3.1% AB-10SL Porewater 4/11/2016 3 0 0 238 3.902 7 0.197 0 0 652 13.569 17.668 210 10.474 64.4 5.3 32.3 0.826 67.2 2.922 19.522 5.0% AB-12S Porewater 4/8/2016 0 0 87 1.426 2410 67.887 0 0 690 14.36 83.673 1830 91.272 1030 84.774 12.1 0.309 21.5 0.935 177.29 35.9% AB-12SL Porewater 4/7/2016 0 0 378 6.197 32.8 0.924 0 0 25.2 0.524 7.645 93.3 4.653 32.5 2.675 8.87 0.227 0 0 1 7.555 -0.6% AB-13S Porewater 4/7/2016 0 0 432 7.082 2.1 0.059 0 0 1 94.2 1.96 9.101 1 151 7.531 21.2 1.745 8.3 0.212 7.11 0.309 9.797 3.7% AB-14S Porewater 4/8/2016 0 0 276 4.525 4.5 0.127 0 0 595 12.383 17.035 136 6.783 90.3 7.432 41.9 1.072 45.3 1.97 17.257 0.6% AB-15S Porewater 4/8/2016 0 0 477 7.82 15.4 0.434 0 0 154 3.205 11.459 148 7.382 48.1 3.959 17.9 0.458 23.2 1.009 12.808 5.6% AB-15SL Porewater 4/8/2016 0 0 139 2.279 2.5 0.07 0 0 59.2 1 1.232 3.581 49.7 1 2.479 12.3 1.012 3.94 0.101 8.85 0.385 3.977 1 5.2% AB-17S Porewater 4/8/2016 0 0 214 3.508 12.3 0.346 0 0 300 6.243 10.097 81.4 4.06 35.2 2.897 13.4 0.343 50.1 2.178 9.478 -3.2% AB-18S Porewater 4/7/2016 0 0 167 2.738 3.4 0.096 0 0 44.8 0.932 3.766 52.4 2.613 12.5 1.029 8.93 0.228 1 8.76 0.381 4.251 6.0% AB-21 S Porewater 4/8/2016 0 0 106 1.738 181 5.099 0 0 609 12.674 19.511 43.3 2.16 56.2 4.626 53.8 1.376 16.3 0.709 8.871 -37.5% AB-3S Porewater 4/7/2016 0 1 0 0 1 0 4.7 0.132 0.35 0.006 1 573 11.925 12.063 1 144 7.182 25.3 2.082 15.3 0.391 10.9 0.474 10.129 -8.7% AB-4S Porewater 4/7/2016 0 0 13 0.213 6.6 0.186 0.63 0.01 43.3 0.901 1.31 15 0.748 3.89 0.32 2.66 0.068 5.1 0.222 1.358 1.8% AB-4SL Porewater 4/7/2016 0 0 72.9 1.195 9 0.254 0 0 31.3 0.651 2.1 27.2 1.357 4.23 0.348 4.76 0.122 9.7 0.422 2.249 3.4% AB-5S Porewater 4/7/2016 0 0 0 0 42.7 1.203 0 0 6420 133.61 134.814 322 16.06 86.4 7.111 3.76 1 0.096 11.5 0.5 23.767 -70.0% AB-6S Porewater 4/7/2016 0 0 346 5.672 3.1 0.087 0 0 501 10.427 16.186 215 10.723 45.8 3.77 32.2 0.824 15.2 0.661 15.978 -0.6% AB-7S Porewater 4/7/20161 0 1 0 1 241 1 3.951 4.1 0.115 1.1 0.018 1 1760 1 36.629 40.713 1 522 1 26.035 94 7.737 124 3.171 47.8 2.078 39.021 -2.1 % AB-8S Porewater 4/7/201161 0 1 0 1 73 1 1.197 3.2 0.09 0 1 0 156 3.247 1 4.534 32.1 1.601 16 1.317 7.06 0.181 10.4 0.452 3.551 -12.2% AL-3S Porewater 4/27/2016 0 0 112 1.836 22.4 0.631 0.2 0.003 2930 60.978 63.448 507 25.287 299 24.609 326 8.338 198 8.609 66.843 2.6% * NO2 + NO3 is being used as a surrogate for nitrate and the molecular weight of nitrate is assumed. 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: Equivalent Weight = Molecular Weight (ool) Charge Result value (ig) Cations (eg) - E Anions(eQ) eq/L = Molecular Wt.(mOl)1 CBE% - Cations( )+ E Anions() X 100 lCharge J Marshall Steam Station Page 3 of 3 CSA Supplement 2