NC0004961_Tables_20171031

2017 Comprehensive Site Assessment Update October 2017
Riverbend Steam Station SynTerra

P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Report\Riverbend CSA
October 2017 Final.docx
TABLES
TABLE 2-1
WELL CONSTRUCTION DATA
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 2-1 Well Construction Data Page 1 of 3
Identification Program Date
Installed
Flow
Layer
Northing
(ft)
Easting
(ft)
Measuring Point
TOC Elevation
(Feet- MSL)
Casing
Adjustment
height
(ft)
Ground Surface
Elevation
(Feet- MSL)
DTW From
TOC1
(ft)
Water Level
Elevation
(Feet - MSL)
Total Well
Depth
Elevation
(Feet-MSL)
Boring
Depth2,3
(Feet BGS)
Surface Casing
Depth3
(Feet BGS)
Total Well
Depth2,3
(Feet BGS)
Measured Well
Depth1
(Feet TOC)
Screen
Length
(ft)
Top of
Screen
Elevation
(Feet- MSL)
Bottom of Screen
Elevation
(Feet- MSL)
AB
‐
01D CAMA 7/1/2015 Deep 595031.01 1415498.78 719.31 -0.17 719.48 57.53 661.78 519.48 210 180 200 198.45 193 198 5 525.86 520.86
AB
‐
01S CAMA 6/24/2015 Shallow 595024.03 1415502.37 719.30 -0.25 719.55 42.78 676.52 651.55 70 --68 44.85 29 44 15 689.45 674.45
AB
‐
02D CAMA 6/29/2015 Deep 594588.42 1415674.97 719.33 -0.22 719.55 48.87 670.46 558.55 209 148 161 156.23 151 156 5 568.10 563.10
AB
‐
02S CAMA 6/22/2015 Shallow 594597.30 1415671.78 719.28 -0.20 719.48 45.96 673.32 649.48 75 --70 66.18 50 65 15 668.10 653.10
AB
‐
03BR CAMA 5/20/2015 Bedrock 593978.52 1415271.06 727.81 -0.57 728.38 NM NA 515.38 224.5 175 213 211.13 206 211 5 521.68 516.68
AB
‐
03D CAMA 5/19/2015 Deep 593974.72 1415275.76 727.72 -0.59 728.31 NM NA 548.31 187.6 171 180 175.09 173 178 5 557.63 552.63
AB
‐
03S CAMA 4/24/2015 Shallow 593982.21 1415267.15 727.78 -0.57 728.35 NM NA 698.35 73 --30 28.11 13 28 15 714.67 699.67
AB
‐
04D CAMA 5/16/2015 Deep 594396.84 1414855.06 728.33 -0.43 728.76 NM NA 519.26 209.5 194 210 202.90 198.5 203.5 5 530.43 525.43
AB
‐
04S CAMA 5/11/2015 Shallow 594393.61 1414857.36 728.27 -0.50 728.77 NM NA 695.77 55 --33 30.18 15 30 15 713.09 698.09
AB
‐
05D CAMA 4/20/2015 Deep 593709.72 1414280.28 724.46 3.12 721.34 NM NA 560.34 169 153 161 165.60 154 159 5 563.86 558.86
AB
‐
05S CAMA 4/14/2015 Shallow 593710.52 1414274.00 724.48 3.12 721.36 NM NA 695.36 26 --26 26.00 9 24 15 713.48 698.48
AB
‐
05SL CAMA 4/20/2015 Shallow 593711.25 1414269.23 724.49 3.06 721.43 NM NA 653.43 68 --68 60.75 47 57 10 673.74 663.74
AB
‐
06BRU CAMA 5/6/2015 Bedrock 593724.39 1414127.53 728.51 -0.30 728.81 68.80 659.71 552.96 180 164 176 175.55 169 174 5 557.96 552.96
AB
‐
06S CAMA 5/4/2015 Shallow 593718.42 1414129.08 728.43 -0.30 728.73 48.43 680.00 660.73 75 --68 66.25 50 65 15 677.18 662.18
AB
‐
07D CAMA 4/2/2015 Deep 593068.72 1415045.66 729.68 2.84 726.84 NM NA 577.84 204 131 149 149.84 142 147 5 584.84 579.84
AB
‐
07I CAMA 3/21/2015 Shallow 593054.50 1415046.03 729.47 2.84 726.63 NM NA 638.13 88.5 --89 87.84 70 85 15 656.63 641.63
AB
‐
07S CAMA 3/23/2015 Shallow 593047.86 1415046.86 729.37 2.53 726.84 NM NA 699.84 27 --27 16.41 5 20 15 727.96 712.96
AB
‐
08D CAMA 4/22/2015 Deep 593295.44 1413887.20 682.46 3.21 679.25 25.86 656.60 581.25 107.3 89 98 99.33 91 96 5 588.13 583.13
AB
‐
08S CAMA 4/2/2015 Shallow 593298.53 1413876.27 681.65 2.87 678.78 26.92 654.73 647.78 44.6 --31 31.33 13 28 15 665.32 650.32
AS
‐
01D CAMA 3/24/2015 Deep 592498.83 1413188.18 766.93 2.97 763.96 NM NA 587.96 183 145 176 185.96 171 176 5 585.97 580.97
AS
‐
01S CAMA 3/24/2015 Shallow 592513.58 1413205.28 767.44 2.96 764.48 NM NA 664.48 100 --100 102.44 81 96 15 680.00 665.00
AS
‐
02D CAMA 4/28/2015 Deep 592600.94 1413757.51 776.96 2.97 773.99 NM NA 581.99 211.18 177 192 214.77 185 190 5 567.19 562.19
AS
‐
02S CAMA 3/9/2015 Shallow 592617.99 1413760.43 776.85 2.67 774.18 NM NA 682.18 92 --92 94.67 74 89 15 697.18 682.18
AS
‐
03D CAMA 3/21/2015 Deep 592656.95 1414310.71 778.58 2.69 775.89 NM NA 627.59 148.3 133 148 150.88 139 144 5 632.70 627.70
AS
‐
03S CAMA 3/16/2015 Shallow 592637.18 1414312.33 778.52 2.83 775.69 NM NA 701.69 90 --74 92.52 59 74 15 701.00 686.00
BG
‐
01D CAMA 6/26/2015 Deep 592581.76 1417064.23 704.46 3.34 701.12 32.91 671.55 498.12 204 189 203 200.33 194.2 199.2 5 509.13 504.13
BG-01D-A CAMA 5/30/2017 Deep 592566.88 1417071.92 703.89 2.76 701.13 NA NA NA NA NA NA NA NA NA NA NA NA
BG
‐
01S CAMA 6/16/2015 Shallow 592578.54 1417067.68 704.22 3.02 701.20 32.86 671.36 656.20 45 --45 43.89 29.7 44.7 15 675.33 660.33
BG
‐
02BR CAMA 7/8/2015 Bedrock 593271.86 1417250.78 705.73 3.02 702.71 56.31 649.42 491.71 213 161 211 209.85 203 208 5 500.88 495.88
BG
‐
02D CAMA 6/26/2015 Deep 593280.76 1417250.70 705.36 3.02 702.34 55.66 649.70 540.34 170 153 162 164.19 155 160 5 546.17 541.17
BG
‐
02S CAMA 6/13/2015 Shallow 593277.86 1417257.99 705.48 2.98 702.50 55.22 650.26 632.50 70 --70 68.06 49 65 16 653.42 637.42
BG
‐
03D CAMA 6/19/2015 Deep 593880.16 1417257.63 674.68 2.10 672.58 28.61 646.07 565.56 111.5 95 107 109.12 100 105 5 570.56 565.56
BG
‐
03S CAMA 6/13/2015 Shallow 593887.13 1417259.35 673.89 1.76 672.13 27.66 646.23 634.83 37.3 --37 34.93 22 37 15 653.96 638.96
BG
‐
04BR CAMA 6/4/2016 Bedrock 591537.38 1412432.40 708.91 2.79 706.12 110.40 598.51 534.77 171 145 171 174.14 168 173 5 539.77 534.77
BG
‐
04D CAMA 4/12/2016 Deep 591529.93 1412441.20 708.33 2.74 705.59 46.31 662.02 566.59 139 124 139 142.58 131 141 10 575.75 565.75
BG
‐
04S CAMA 3/3/2016 Shallow 591526.41 1412435.17 707.97 2.62 705.35 46.22 661.75 635.35 70 --70 68.14 53 68 15 654.83 639.83
BG
‐
05BR CAMA 4/4/2016 Bedrock 591030.31 1410108.20 719.24 2.74 716.50 38.85 680.39 580.50 164 120 136 135.90 128 133 5 588.34 583.34
BG
‐
05D CAMA 3/17/2016 Deep 591026.49 1410117.07 719.23 2.78 716.45 35.89 683.34 612.45 104 94 104 105.59 98 103 5 618.64 613.64
C
‐
01BRU CAMA 4/8/2015 Bedrock 593097.48 1412815.04 662.23 2.98 659.25 21.81 640.42 537.25 127 113 122 123.00 115 120 5 544.23 539.23
C-01BRU-A CAMA 6/22/2017 Bedrock 593102.72 1412799.09 663.01 2.92 660.09 5.60 654.49 542.09 118 95 118 NM 113 118 5 547.09 542.09
C
‐
01S CAMA 4/2/2015 Shallow 593084.92 1412807.55 663.00 2.88 660.12 8.78 654.22 643.12 17 --17 18.30 5 15 10 654.70 644.70
C
‐
02D CAMA 4/5/2015 Deep 592974.08 1413151.06 684.53 2.92 681.61 30.60 653.93 541.61 152 126.5 140 142.15 133 138 5 547.38 542.38
Screened
Interval3
(Feet BGS)
TABLE 2-1
WELL CONSTRUCTION DATA
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 2-1 Well Construction Data Page 2 of 3
Identification Program Date
Installed
Flow
Layer
Northing
(ft)
Easting
(ft)
Measuring Point
TOC Elevation
(Feet- MSL)
Casing
Adjustment
height
(ft)
Ground Surface
Elevation
(Feet- MSL)
DTW From
TOC1
(ft)
Water Level
Elevation
(Feet - MSL)
Total Well
Depth
Elevation
(Feet-MSL)
Boring
Depth2,3
(Feet BGS)
Surface Casing
Depth3
(Feet BGS)
Total Well
Depth2,3
(Feet BGS)
Measured Well
Depth1
(Feet TOC)
Screen
Length
(ft)
Top of
Screen
Elevation
(Feet- MSL)
Bottom of Screen
Elevation
(Feet- MSL)
Screened
Interval3
(Feet BGS)
C 02S CAMA 3/23/2015 Shallow 592968.44 1413170.22 684.29 3.00 681.29 27.18 657.11 646.29 37 --35 36.29 18 33 15 663.00 648.00
GWA
‐
01BRU CAMA 6/15/2015 Bedrock 595502.82 1414366.63 696.47 3.10 693.37 39.21 657.26 612.37 81 65 81 82.17 72 77 5 619.30 614.30
GWA
‐
01S CAMA 6/9/2015 Shallow 595510.09 1414374.78 696.23 3.24 692.99 39.36 656.87 645.99 49 --47 49.21 28 43 15 662.02 647.02
GWA
‐
02BR CAMA 5/5/2015 Bedrock 594397.34 1413837.03 689.82 3.25 686.57 44.84 644.98 561.57 125 74 125 124.13 115 120 5 570.69 565.69
GWA
‐
02BRU CAMA 5/7/2015 Bedrock 594398.42 1413840.85 689.85 3.06 686.79 44.86 644.99 602.79 91 75 84 80.10 77 82 5 614.75 609.75
GWA
‐
02S-A CAMA 2/6/2016 Shallow NA NA NA NA NA 45.50 NA NA 60 --60 NM 41 56 15 NA NA
GWA
‐
02S CAMA 7/7/2015 Shallow 594388.30 1413839.31 689.88 3.32 686.56 49.00 640.88 633.56 53 --53 53.32 35 50 15 651.56 636.56
GWA-03BR CAMA 10/21/2016 Bedrock 593374.00 1412331.00 678.23 3.43 674.80 30.19 648.04 580.80 94 56.19 94 92.54 79 89 10 595.69 585.69
GWA
‐
03D CAMA 4/24/2015 Deep 593358.78 1412338.93 677.08 3.12 673.96 31.22 645.86 624.96 55 39 49 50.35 42 47 5 631.73 626.73
GWA
‐
03S CAMA 4/23/2015 Shallow 593361.15 1412342.59 677.08 2.95 674.13 NM NA 645.13 29 --29 12.99 18 28 10 674.09 664.09
GWA
‐
03S-A CAMA 6/25/2015 Shallow 593367.94 1412339.14 677.05 2.71 674.34 31.19 645.86 634.84 39.5 --40 41.42 23 39 16 651.63 635.63
GWA-04BR CAMA 7/18/2015 Bedrock 592223.54 1412747.74 695.89 2.96 692.93 24.89 671.00 527.93 174.5 127 165 167.15 159 164 5 533.74 528.74
GWA
‐
04D CAMA 7/1/2015 Deep 592203.26 1412745.43 696.56 2.88 693.68 25.66 670.90 567.68 126 118 126 130.15 120 125 5 571.41 566.41
GWA
‐
04S CAMA 6/22/2015 Shallow 592212.40 1412746.66 696.35 2.95 693.40 24.71 671.64 657.40 36 --36 34.98 17 32 15 676.37 661.37
GWA
‐
05D CAMA 4/16/2015 Deep 592403.01 1414883.71 787.63 3.19 784.44 74.51 713.12 565.44 237 191 219 220.19 212 217 5 572.44 567.44
GWA
‐
05S CAMA 4/15/2015 Shallow 592405.64 1414889.82 787.95 3.10 784.85 77.70 710.25 708.85 76 --76 78.31 60 75 15 724.64 709.64
GWA
‐
06D CAMA 3/21/2015 Deep 592758.69 1415367.04 770.06 3.03 767.03 60.55 709.51 617.03 166 140 150 149.87 143 148 5 625.19 620.19
GWA
‐
06S CAMA 3/9/2015 Shallow 592760.54 1415388.34 770.49 2.87 767.62 60.35 710.14 706.62 61 --61 62.97 45 60 15 722.52 707.52
GWA
‐
07BR CAMA 5/14/2015 Bedrock 593517.35 1416298.25 688.23 3.25 684.98 17.59 670.64 547.98 173 119 137 135.55 127 132 5 557.68 552.68
GWA
‐
07D CAMA 4/29/2015 Deep 593504.07 1416299.01 689.15 3.26 685.89 18.23 670.92 578.89 129.5 88 107 108.70 100 105 5 585.45 580.45
GWA
‐
07S CAMA 4/22/2015 Shallow 593505.40 1416293.49 689.24 3.17 686.07 16.55 672.69 663.07 23 --23 23.26 5 20 15 680.98 665.98
GWA
‐
08D CAMA 6/10/2015 Deep 594143.08 1416106.78 689.00 3.35 685.65 24.06 664.94 564.15 121.5 93 122 122.10 111 116 5 571.90 566.90
GWA
‐
08S CAMA 6/4/2015 Shallow 594140.01 1416104.71 689.24 3.23 686.01 24.89 664.35 662.22 24 --24 27.02 8 23 15 677.22 662.22
GWA
‐
09BR CAMA 6/25/2015 Bedrock 594614.17 1415968.76 654.26 2.77 651.49 103.26 551.00 535.49 120 49.5 116 110.18 106 111 5 549.08 544.08
GWA
‐
09D CAMA 5/20/2015 Deep 594609.76 1415973.14 654.69 2.61 652.08 3.31 651.38 585.08 72.25 51 67 70.18 62 67 5 589.51 584.51
GWA
‐
09S CAMA 5/6/2015 Shallow 594615.65 1415972.82 654.46 2.82 651.64 6.35 648.11 634.64 17 --17 18.44 5 15 10 646.02 636.02
GWA
‐
10BRU CAMA 6/20/2015 Bedrock 595755.16 1415038.67 657.57 3.06 654.51 13.04 644.53 508.01 146.5 125 147 138.68 133.5 138.5 5 523.89 518.89
GWA
‐
10S CAMA 6/17/2015 Shallow 595743.15 1415047.47 658.71 3.13 655.58 11.75 646.96 632.08 23.5 --23.5 22.60 8 22.5 15 651.11 636.11
GWA
‐
11D CAMA 2/20/2016 Deep 593109.77 1412075.98 672.81 3.09 669.72 28.03 644.78 554.72 115 105 115 117.09 109 114 5 560.72 555.72
GWA
‐
11S CAMA 2/4/2016 Shallow 593105.90 1412087.83 672.27 3.07 669.20 26.17 646.10 637.20 32 --32 33.30 16 31 15 653.97 638.97
GWA
‐
12D CAMA 1/31/2016 Deep 592652.05 1412394.90 685.97 3.60 682.37 24.50 661.47 544.37 190 126 138 140.45 130 135 5 550.52 545.52
GWA
‐
12S CAMA 1/30/2016 Shallow 592662.96 1412395.12 685.15 3.14 682.01 26.02 659.13 650.01 32 --32 31.68 15 30 15 668.47 653.47
GWA
‐
13D CAMA 4/29/2016 Deep 591995.47 1413562.74 744.78 -0.34 745.12 55.87 688.91 463.12 287 272 282 285.96 277 282 5 463.82 458.82
GWA
‐
13S CAMA 4/28/2016 Shallow 591995.71 1413550.82 744.40 -0.37 744.77 55.82 688.58 680.00 62 --65 64.40 44 59 15 695.00 680.00
GWA
‐
14D CAMA 4/28/2016 Deep 592533.89 1415604.13 779.25 2.75 776.50 71.06 708.19 565.50 218 199 211 211.39 203 208 5 572.86 567.86
GWA
‐
14S CAMA 1/30/2016 Shallow 592530.37 1415598.10 779.50 3.22 776.28 69.78 709.72 694.28 82 --82 82.81 62 80 18 714.69 696.69
GWA-15D CAMA 10/18/2016 Deep 593261.00 1412910.00 NA NA 665.80 14.30 651.50 547.80 118 103 118 114.67 104 114 10 561.80 551.80
GWA-15S CAMA 10/18/2016 Shallow 593261.00 1412906.00 NA NA 666.10 16.20 649.90 621.10 45 --45 45.19 30 45 15 636.10 621.10
GWA
‐
20BR CAMA 7/20/2015 Bedrock 592206.05 1413554.51 738.35 -0.41 738.76 50.30 688.05 427.96 310.8 260 311 310.50 301 306 5 432.85 427.85
GWA-20D-A CAMA 6/14/2017 Deep 592210.16 1413519.91 736.31 -0.34 736.66 48.40 688.26 473.66 263 248 263 NM 255 260 5 481.66 476.66
GWA
‐
20D CAMA 7/6/2015 Deep 592208.39 1413533.63 737.25 -0.36 737.61 47.96 689.29 477.61 260 250 260 258.55 253 258 5 483.70 478.70
GWA
‐
20S CAMA 6/29/2015 Shallow 592204.02 1413568.43 739.05 -0.47 739.52 49.79 689.26 684.52 55 --55 52.53 37 53 16 702.52 686.52
GWA
‐
21BR CAMA 8/17/2015 Bedrock 592044.72 1413988.30 NA NA NA 76.09 NA NA 355 295 355 351.90 346 351 5 NA NA
GWA
‐
21D CAMA 7/31/2015 Deep 592047.54 1413985.97 NA NA NA 76.45 NA NA 282 260 282 277.04 274 279 5 NA NA
GWA
‐
21S CAMA 7/26/2015 Shallow 592039.09 1413993.11 NA NA NA 69.46 NA NA 75 --75 71.82 57 72 15 NA NA
GWA
‐
22BR
‐
A CAMA 7/17/2015 Bedrock 592257.01 1414026.69 763.78 3.07 760.71 63.20 700.58 483.71 298.8 248 277 227.18 269 274 5 541.60 536.60
GWA
‐
22D CAMA 6/21/2015 Deep 592257.68 1414008.73 761.94 3.24 758.70 61.05 700.89 554.70 213 183 204 206.03 198 203 5 560.91 555.91
GWA
‐
22S CAMA 5/12/2015 Shallow 592255.58 1414015.36 762.51 3.05 759.46 57.93 704.58 705.46 57 --54 58.68 40 55 15 718.83 703.83
GWA
‐
23BR CAMA 7/6/2015 Bedrock 592269.35 1413842.87 746.23 2.65 743.58 50.32 695.91 451.58 302.5 247 292 292.91 285 290 5 458.32 453.32
GWA-23D-A CAMA 6/6/2017 Deep 592263.63 1413806.34 745.70 3.06 742.65 47.23 695.42 503.65 239 194 239 NM 227 232 5 515.65 510.65
GWA
‐
23D CAMA 6/11/2015 Deep 592272.79 1413841.08 745.94 2.74 743.20 48.31 697.63 515.97 227 201 227 229.97 221 226 5 520.97 515.97
GWA
‐
23S CAMA 5/15/2015 Shallow 592276.82 1413840.94 745.91 2.47 743.44 47.32 698.59 693.44 50 --50 51.63 33 48 15 709.28 694.28
TABLE 2-1
WELL CONSTRUCTION DATA
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 2-1 Well Construction Data Page 3 of 3
Identification Program Date
Installed
Flow
Layer
Northing
(ft)
Easting
(ft)
Measuring Point
TOC Elevation
(Feet- MSL)
Casing
Adjustment
height
(ft)
Ground Surface
Elevation
(Feet- MSL)
DTW From
TOC1
(ft)
Water Level
Elevation
(Feet - MSL)
Total Well
Depth
Elevation
(Feet-MSL)
Boring
Depth2,3
(Feet BGS)
Surface Casing
Depth3
(Feet BGS)
Total Well
Depth2,3
(Feet BGS)
Measured Well
Depth1
(Feet TOC)
Screen
Length
(ft)
Top of
Screen
Elevation
(Feet- MSL)
Bottom of Screen
Elevation
(Feet- MSL)
Screened
Interval3
(Feet BGS)
MW 01D Voluntary 12/11/2006 Deep 593747.60 1413818.00 653.26 2.69 650.57 3.89 649.37 588.57 62 --62 64.26 54 62 8 597.00 589.00
MW
‐
01S Voluntary 12/11/2006 Shallow 593746.70 1413827.00 653.81 2.64 651.17 2.42 651.39 636.12 15 --15 17.69 5 15 10 646.12 636.12
MW
‐
02D Voluntary 12/8/2006 Deep 595036.60 1414516.00 715.21 2.71 712.50 35.87 679.34 628.50 88 --84 92.98 83 88 5 627.23 622.23
MW
‐
02S Voluntary 12/8/2006 Shallow 595037.80 1414508.00 714.49 2.16 712.33 27.39 687.10 687.10 25 --25 27.39 15 25 10 697.10 687.10
MW
‐
02S
‐
A CAMA 2/6/2016 Shallow 595023.05 1414538.13 717.82 3.65 714.17 36.82 681.00 663.13 51 --51 54.69 45 60 15 678.13 663.13
MW
‐
03D Voluntary 11/29/2006 Deep 595649.20 1414954.00 654.96 2.47 652.49 3.60 651.36 614.99 37.5 --38 36.62 30 35 5 623.34 618.34
MW
‐
03S Voluntary 11/29/2006 Shallow 595657.00 1414954.00 655.47 2.57 652.90 9.80 645.67 639.17 14 --14 16.30 4 14 10 649.17 639.17
MW
‐
04D Voluntary 11/30/2006 Deep 595495.40 1415469.00 668.38 2.53 665.85 21.21 647.17 605.85 60 --60 61.21 55 60 5 612.17 607.17
MW
‐
04S Voluntary 11/30/2006 Shallow 595497.80 1415477.00 667.72 2.34 665.38 19.76 647.96 645.38 20 --20 21.30 10 20 10 656.42 646.42
MW
‐
05D Voluntary 11/22/2006 Deep 595066.80 1415817.00 649.89 2.69 647.20 2.68 647.21 567.39 80 --80 82.50 74 79 5 572.39 567.39
MW
‐
05S Voluntary 11/22/2006 Shallow 595068.40 1415825.00 649.41 2.51 646.90 4.55 644.86 631.87 15 --15 17.54 5 15 10 641.87 631.87
MW
‐
06D Voluntary 11/17/2006 Deep 594666.40 1415945.00 650.80 3.02 647.78 1.40 649.40 573.28 74.5 --75 78.10 70 75 5 577.70 572.70
MW
‐
06S Voluntary 11/17/2006 Shallow 594671.70 1415942.00 650.33 2.73 647.60 2.20 648.13 632.83 15 --15 17.50 5 15 10 642.83 632.83
MW
‐
07BR CAMA 6/26/2015 Bedrock 592797.39 1415855.55 765.80 3.14 762.49 57.86 707.94 557.99 240 187 204.5 204.56 196 201 5 566.24 561.24
MW-07BR-A CAMA 6/1/2017 Bedrock 529778.86 1415838.31 765.41 2.84 762.57 NM NA 559.57 203 187 203 NM 197 202 5 565.57 560.57
MW
‐
07D Voluntary 12/2/2006 Deep 592779.10 1415850.00 765.15 2.18 762.97 57.03 708.12 662.97 100 --100 102.18 95 100 5 667.97 662.97
MW
‐
07S Voluntary 12/2/2006 Shallow 592781.00 1415852.00 NA NA NA NM NA NA 48 --48 52.29 38 48 10 NA NA
MW
‐
07SR NPDES 11/10/2010 Shallow 592785.20 1415850.00 765.43 3.01 762.42 57.88 707.55 694.42 68 --68 63.00 43 63 20 722.43 702.43
MW
‐
08D NPDES 10/26/2010 Deep 592170.30 1413844.00 756.03 2.08 753.95 57.49 698.54 553.95 200 --200 170.97 161 171 10 595.06 585.06
MW
‐
08I NPDES 10/26/2010 Shallow 592179.30 1413850.00 754.74 2.25 752.49 54.66 700.08 632.36 120 --120 122.38 98 118 20 652.36 632.36
MW
‐
08S NPDES 11/3/2010 Shallow 592177.70 1413863.00 755.40 2.46 752.94 NM NA 692.94 60 --60 53.31 35 55 20 722.09 702.09
MW
‐
09 NPDES 11/11/2010 Shallow 593485.50 1413277.00 651.84 2.91 648.93 3.75 648.09 618.93 30 --30 26.49 13 28 15 640.35 625.35
MW-09BR-A CAMA 6/21/2017 Bedrock 593461.61 1413266.43 651.80 2.87 648.93 0.40 651.40 500.93 148 93 148 NM 141 146 5 507.93 502.93
MW
‐
09BR CAMA 6/22/2015 Bedrock 593477.49 1413278.00 651.64 2.89 648.75 2.50 649.14 496.75 196 145 152 154.89 147 152 5 501.75 496.75
MW
‐
09D CAMA 5/14/2015 Deep 593490.30 1413265.90 651.48 2.98 648.50 3.07 648.41 540.50 123 95 108 106.27 101 106 5 550.21 545.21
MW-09D-A CAMA 6/21/2017 Deep 593479.16 1413265.93 NA NA NA NM NA NA 106 91 106 NM 101 106 5 NA NA
MW
‐
10 NPDES 11/10/2010 Shallow 594277.40 1413609.00 654.37 2.37 652.00 8.89 645.48 627.00 25 --25 16.62 13 18 5 642.75 637.75
MW
‐
11DR NPDES 12/20/2010 Deep 595196.80 1414126.00 693.18 2.62 690.56 33.88 659.30 644.56 46 --46 38.90 35 40 5 659.28 654.28
MW
‐
11SR NPDES 12/12/2010 Shallow 595195.80 1414130.00 693.30 2.80 690.50 NM NA 660.00 30.50 --30.5 29.55 15 30 15 678.75 663.75
MW-12 NPDES 11/9/2010 Shallow NA NA NA NA NA NM NA NA 22.50 --23 23.52 4 19 15 NA NA
MW
‐
13 NPDES 11/10/2010 Shallow 595355.00 1415763.00 654.11 2.30 651.81 9.77 644.34 626.81 25 --25 20.36 3 18 15 648.75 633.75
MW
‐
14 NPDES 11/4/2010 Shallow 594338.80 1416364.00 662.84 1.89 660.95 11.63 651.21 620.95 40 --40 22.56 3 18 15 655.28 640.28
MW
‐
15 NPDES 2/18/2011 Shallow 595979.60 1414680.00 657.12 3.24 653.88 12.90 644.22 638.88 15 --15 17.29 5 15 10 649.83 639.83
MW
‐
15BR CAMA 5/22/2015 Bedrock 595981.89 1414695.44 656.53 3.28 653.25 12.49 644.04 591.25 62 37 62 64.55 56 61 5 596.98 591.98
MW
‐
15D CAMA 5/19/2015 Deep 595973.56 1414693.63 656.69 3.30 653.39 12.46 644.23 604.39 49 37 49 47.75 41 46 5 613.94 608.94
MW-15D-A CAMA 6/7/2017 Deep 595965.70 1414704.67 656.32 3.00 653.32 NM 644.42 604.32 49 37 49 NM 41 46 5 612.32 607.32
OB
‐
01 CAMA 4/16/2015 Shallow 593163.30 1415785.47 749.02 3.00 746.02 46.41 702.61 696.02 50 --50 50.82 33 48 15 713.20 698.20
OB
‐
02 CAMA 4/16/2015 Shallow 593141.87 1416301.36 723.1 2.99 720.11 49.88 673.22 664.11 56 --56 57.16 39 54 15 680.94 665.94
Prepared by: WJW Checked by: KDF
Notes:
BGS - Below ground surface PVC- Polyvinyl chloride
ft - feet UNK - Data not known
NA - Not applicable NM - Not Measured
MSL - Mean sea level TOC - Top of Casing
Red font indicates the well has been abandoned
* Estimated until ground surface elevation is resurveyed.
3 - Values measured during well installation.
? - No boring logs available for previously installed piezometers.
1 - Water levels taken on May 22, 2017; Well depths initially measured by Pace/HDR, June 17, 2015 and updated when new wells installed.
2 - "Boring Depth" is the total depth of soil boring; "Total Well Depth" is the depth to the bottom of the filter pack.
TABLE 2-2
SUMMARY OF ONSITE ENVIRONMENTAL INCIDENTS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement
2017\Final\Tables\Table 2-2 Summary of Onsite Environmental Incidents.docx Page 1 of 1

NCDENR
Incident #
Year
Reported
Location of
Incident
Impacted
Media Brief Description Status
3704 1988
At retired
combustion
turbine
units
Soil/
Groundwat
er
Release of #2 fuel
oil from
underground piping
associated with
combustion turbine
system

Approximately
1,400 gallons of
free product
recovered. Free
product recovery no
longer occurs
Approximately
11,000 tons of
impacted soils were
excavated and
transported for
offsite disposal in
June 2016.

The last
groundwater
monitoring event
was performed in
June 2017

Duke Energy will
soon submit a
report petitioning
the NCDEQ for NFA
3736 1988
Along fuel
oil piping
route to
former
combustion
turbine
units
Soil Fuel oil, no estimate
of release Closed in 1997
3875 1995 At 4.25M
gallon AST Soil
Fuel oil from
underground pipe
to AST;
Contaminated soil
was removed
A Notice of
Contaminated Site
(NCS) and
declaration have
been generated for
the release.

Public notification
has been made and
NCS will be filed
with the Registrar
of Deeds in late
October 2017.

Anticipate NFA
letter from NCDEQ
in November 2017.
Prepared by: WJW Checked by: JDM
Note:
1. Information regarding onsite environmental incidents provided by Duke Energy.

Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin,
August 18, 2015.
Table 3-1. Range (10th percentile – 90th percentile) in Bulk Composition of Fly Ash,
Bottom Ash, Rock, and Soil (Source: EPRI 2009a)

Table 3-2. Soil/Material Properties for Ash, Fill, Alluvium, and Soil/Saprolite Riverbend Steam Station
Plastic
Limit (PL)
Liquid
Limits (LL)
Plasticity
Index (PI)Coarse7 Fine8 Coarse9 Medium10 Fine11 Silt12 Clay13
AB-1D Jar 18.5-20 Tan-Brown Elastic Silt --31.0 ---0.0 0.3 0.5 7.2 12.7 30.7 48.6 -1.3%-F
AB-1D UD 75-77 Olive-Brown Silty Sand SM 2.705 23.6 30 41 11 0.0 9.5 16.1 11.7 20.6 34.2 7.9 41.6%22%8.16E-07 M1
AB-1S UD 61-63 Red-Brown Elastic Silt with Sand MH 2.701 23.6 42 69 27 0.0 0.5 4.6 7.4 14.1 31.6 41.8 41.4%3%8.12E-07 F
AB-2D Jar 48.5-50 Red-Brown Elastic Silt --28.4 ---0.0 6.7 1.4 6.5 15.9 34.3 35.2 -4%-F
AB-2D UD 83-85 Olive-Brown Sandy Silt ML 2.848 36.7 NP 44 NP 0.0 0.0 0.5 2.3 35.6 53.7 7.9 52.4%17%5.04E-05 M1
AB-2S UD 30-32 Red-Brown Sandy Elastic Silt MH 2.729 33.4 43 62 19 0.0 2.1 6.1 8.9 12.4 39.1 31.4 50.0%4%1.06E-05 F
AB-3D Jar 13.5-15 Red-Brown Clayey Sand --12.6 ---0.0 11.3 8.9 23.4 21.0 8.5 26.9 ---F
AB-3S UD 8-10 Red-Brown Clayey Sand with Gravel SC 2.651 28 55 27 0.0 16.0 12.5 30.0 17.1 4.3 20.1 -14%-F
AB-4D Jar 13.5-15 Red-Brown Sandy Elastic Silt --24.4 ---0.0 0.6 0.7 9.5 21.2 27.4 40.6 -3%-F
AB-4S UD 18-20 Red-Brown Clayey Sand SC 2.629 13.5 23 49 26 0.0 1.4 3.1 21.8 27.1 7.4 39.2 43.9%-5.75E-05 A / F
AB-5D Jar 28.5-30 Fly Ash --29.0 ---0.0 11.3 14.0 15.6 19.5 33.9 5.7 -24%-A
AB-5SL UD 59-61 Red-Brown Sandy Lean Clay CL 2.672 16.7 25 45 20 0.0 9.7 4.0 13.4 21.4 17.3 34.2 32.7%-9.32E-07 M1
AB-6BRU Jar 23.5-25 Red-Brown Elastic Silt --34.2 ---0.0 1.9 1.8 7.6 14.3 30.5 43.9 -2%-F
AB-6BRU UD 93-95 Orange-Brown Sandy Elastic Silt MH 2.624 48.9 41 54 13 0.0 0.0 0.9 10.5 18.5 44.0 26.1 56.3%5%1.56E-06 M1
AB-6S UD 23-24.2 Orange-Brown Clayey Sand SC 2.669 12.0 20 37 17 0.0 3.6 6.0 22.1 27.1 13.2 28.0 46.1%-1.02E-04 F
AB-7D Jar 3.5-5 Fly Ash --52.4 ---0.0 1.0 1.1 2.8 29.3 53.3 12.5 -14%-A
AB-7S UD 25-27 Whitish-Red Silty Sand SM 2.669 20.9 29 47 18 0.0 0.1 2.7 28.7 24.0 18.7 25.8 40.6%6%4.82E-05 M1
AB-8S UD 2.2-4.5 Red-Brown Elastic Silt MH 2.658 40.7 49 77 28 0.0 0.0 0.0 0.6 3.3 37.5 58.6 55.4%1%9.13E-05 M1
AB-8S UD 28-30 Orange-Brown Elastic Silt with Sand MH 2.700 52.6 41 51 10 0.0 0.0 0.1 2.8 23.4 61.9 11.8 59.8%13%3.33E-06 M1
AB-8S UD 43-45 Light-Brown Silt with Sand ML 2.681 35.8 38 45 7 0.0 0.0 0.0 1.9 18.5 70.4 9.2 48.9%12%2.04E-05 M2
AS-1S UD 40-42 Fly Ash ML 2.134 31.6 NP NV NP 0.0 0.2 0.0 0.7 23.0 72.0 4.1 51.8%15%1.33E-04 A
AS-2S UD 8-10 Fly Ash ML 2.193 46.8 NP NV NP 0.0 0.0 0.8 0.7 8.2 81.2 9.1 52.9%7%2.15E-05 A
AS-2S UD 53-55 Grey-Red Sandy Elastic Silt MH 2.687 23.9 29 50 21 0.0 3.8 3.2 18.2 23.2 25.7 25.9 42.0%5%1.03E-06 M1
AS-2S UD 88-90 White-Brown Silty Sand SM 2.683 20.1 NP NV NP 0.0 0.0 4.5 24.7 38.1 27.3 5.4 37.7%26%7.37E-05 M1
AS-3D Jar 23.5-25 Fly Ash --18.6 ---0.0 2.0 4.5 11.7 30.8 42.7 8.3 -19%-A
AS-3S UD 25-27 Fly Ash ML 2.259 29.4 NP NV NP 0.0 1.1 1.8 3.7 15.0 65.3 13.1 48.5%10%1.84E-05 A
BG-1S UD 10-12.3 Red-Brown Micaceous Sandy Elastic Silt MH 2.676 30.7 NP 53 NP 0.0 0.0 2.7 20.7 25.6 32.6 18.4 51.0%12%7.42E-06 M1
BG-1S UD 35-37.3 Red-Brown Silty Sand SM 2.689 36.2 45 47 2 0.0 0.0 8.5 22.0 27.4 33.8 8.3 51.8%21%6.93E-05 M1
C-2D Jar 8.5-10 Black-Brown Silty Sand with PWR --23.8 ---0.0 17.1 10.8 18.4 26.7 15.1 11.9 -20%-A
C-2S UD 35-37 White-Brown Silty Sand SM 2.676 30.7 NP NV NP 0.0 0.0 1.7 25.1 37.7 32.0 3.5 48.7%26%2.36E-04 M1
GWA-10BRU Jar 3.5-5 Orange-Brown Elastic Silt with Gravel --21.5 ---0.0 20.9 1.3 2.2 22.6 18.1 34.9 ---M1
GWA-10S UD 21-23 Brown Elastic Silt with Sand MH 2.709 38.0 56 86 30 0.0 0.0 1.0 10.3 12.6 29.2 46.9 53.6%2%3.86E-06 M1
GWA-1S UD 47-47.75 Grey-White Silty Sand SM 2.923 15.0 NP 27 NP 0.0 0.2 0.8 14.0 49.5 31.3 4.2 34.2%26%1.90E-05 M1
GWA-2S UD 50-50.5 -M1/M2
GWA-3S UD 24-25 Light Brown Clayey Sand with Gravel SC 2.638 11.5 19 27 8 0.0 15.5 16.8 23.7 20.3 17.1 6.6 48.8%27%2.51E-06 M2
GWA-4D Jar 5-6.5 Red-Brown Elastic Silt --31.2 ---0.0 0.0 3.2 13.3 11.5 41.3 30.7 -4%-M1
GWA-4D Jar 55-56.5 Tan-White Silty Sand --14.8 ---0.0 2.3 16.2 31.8 29.6 15.7 4.4 -30%-M2
GWA-4S UD 32-34 White-Brown Silty Sand SM 2.660 NP 30 NP 0.0 1.6 20.4 21.8 33.3 19.6 3.3 -30%-M1
GWA-5D Jar 83.5-85 Reddish-White Sandy Elastic Silt --27.0 ---0.0 0.0 1.1 21.2 21.0 38.4 18.3 -12%-M1
GWA-5D Jar 168.5-169.6 Orange-Brown Sandy Elastic Silt --23.6 ---0.0 0.0 2.7 21.1 24.5 37.5 14.2 -15%-M2
GWA-5S UD 74-76 Orange-Brown Sandy Silt ML 2.651 40 45 5 0.0 0.0 2.0 20.7 24.3 39.6 13.4 -16%-M1
GWA-6D Jar 48.5-50 Red-Brown and White Sandy Silt --31.0 ---0.0 0.0 1.2 21.7 26.8 36.9 13.4 -16%-M1
GWA-6D Jar 128.5-129.6 Olive-White Sandy Elastic Silt --21.1 ---0.0 0.0 0.3 3.6 20.1 60.7 15.3 -10%-M2
GWA-6S UD 13.5-15.5 Yellow-Brown Clayey Sand SC 2.657 16.2 25 40 15 0.0 1.3 2.8 30.1 25.7 21.4 18.7 32.2%12%4.14E-06 M1
GWA-6S UD 33.5-35.5 Light Purple Sandy Silt ML 2.665 30.3 36 48 12 0.0 0.0 0.0 9.0 39.3 40.6 11.1 52.8%18%9.85E-05 M1
GWA-7D Jar 38.5-40 Olive-Brown and White Sandy Elastic Silt --31.3 ---0.0 0.0 0.7 12.3 19.1 44.2 23.7 -6%-M1
GWA-7D Jar 83.5-84 White-Brown and Black Silty Sand --18.8 ---0.0 0.0 0.2 22.4 28.9 36.9 11.6 -18%-M2
GWA-7S UD 20-22 Whitish-Brown Sandy Silt ML 2.680 40.1 29 44 15 0.0 0.1 4.3 15.0 13.8 44.6 22.2 51.6%8%3.99E-06 M1
GWA-8D Jar 18.5-20 Red-Brown Sandy Silt --50.9 ---0.0 0.0 0.2 4.9 30.6 44.2 20.1 -10%-M1
GWA-8D Jar 69-70.1 Olive-Brown Silty Sand --11.3 ---0.0 1.5 5.9 20.6 28.9 34.5 8.6 -20%-M2
GWA-8S UD 20-22 Orange-Brown Sandy Silt ML 2.644 39.3 28 35 7 0.0 0.0 6.7 5.6 36.6 34.1 17.0 51.5%14%2.96E-05 M1
GWA-9BRA UD 14-16 Red-Brown Elastic Silt with Sand MH 2.694 34.4 37 79 42 0.0 0.3 0.5 4.2 10.0 13.8 71.2 49.5%-7.11E-07 M1
MW-9BR UD 10-12 Yellow-White Elastic Silt MH 2.603 39.3 32 57 25 0.0 0.0 0.0 0.2 8.2 33.3 58.3 49.8%0.75%9.50E-08 M1
MW-9BR UD 18-20 Grey Sandy Silt ML 2.642 23.4 25 27 2 0.0 0.7 0.9 1.3 27.8 48.2 21.1 37.5%8%7.32E-08 M1
MW-9BR UD 55-56 Orange-Brown Silt with Sand ML 2.747 16.2 33 38 5 0.0 0.3 2.5 6.0 15.4 68.9 6.9 32.3%14%1.59E-05 M2
Notes:
1. ASTM Standard D 2487, Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)
Hydrostratigraphy% Gravel % Sand % FinesSpecific
Gravity2
Natural
Moisture
Content3
(%)
Atterberg Limits4 Grain Size5
Total
Porosity2 (%)
Vertical Hydraulic
Conductivty6, kv20,
(cm/sec)
Estimated
Specific
Yield/Effective
Porosity14 (%)
2" Recovery, Loose Material; No Permeability or Hydrometer
Borehole Sample # Depth (ft)Material Description USCS1
Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin, August 18, 2015.
Table 3-2. Soil/Material Properties for Ash, Fill, Alluvium, and Soil/Saprolite Riverbend Steam Station
Plastic
Limit (PL)
Liquid
Limits (LL)
Plasticity
Index (PI)Coarse7 Fine8 Coarse9 Medium10 Fine11 Silt12 Clay13
Hydrostratigraphy% Gravel % Sand % FinesSpecific
Gravity2
Natural
Moisture
Content3
(%)
Atterberg Limits4 Grain Size5
Total
Porosity2 (%)
Vertical Hydraulic
Conductivty6, kv20,
(cm/sec)
Estimated
Specific
Yield/Effective
Porosity14 (%)
Borehole Sample # Depth (ft)Material Description USCS1
2. ASTM Standard D 854, "Standard Test Methods for Specific Gravity of Soil Solids by Water Pycnometer"
3. ASTM Standard D 2216, "Standard Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass
4. ASTM Standard D 4318, "Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils
5. ASTM Standard D 422, "Standard Test Method for Particle-Size Analysis of Soils
6. ASTM Standard D 5084, "Standard Test Methods for Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter"
7. Coarse Gravel: 19.0mm – 75mm
8. Fine Gravel: 4.75mm – 19.0mm
9. Coarse Sand: 2.0mm – 4.75mm
10. Medium Sand: 0.425mm – 2.0mm
11. Fine Sand: 0.075mm – 0.425mm
12. Silt: 0.005mm – 0.075mm
13. Clay: <0.005mm
14. All columns directly derived from laboratory analyses except "Estimated Specific Yield/Effective Porosity."
Specific yield/effective porosity estimated from soil testing using Fetter/Bear diagrams (Johnson, 1967).
15. Effective porosity and specific yield are not synonymous. For practical purposes, they may be estimated as approximately equal in value.
16. AB-6BRU represented as AB-6D on geotechnical lab reports due to re-name event after sample submission
17. GWA-9BRA represented as GWA-9D on lab reports due to re-name event after sample submission
18. GWA-10BRU represented as GWA-10D on lab report due to re-name event after sample submission
Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin, August 18, 2015.
Table 4-1. Public and Private Water Supply Wells Within 0.5-Mile Radius of Riverbend Steam Station Ash Basin Compliance Boundary
Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin, August 18, 2015.
Map ID #
Public Water
System Name
Property Address
(well location)County Parcel ID Number Reported Well Use
Approximate Distance
from Ash Basin
Compliance Boundary
(ft)
Direction from Ash
Basin
Well
Depth
(ft-bgs)
Well Casing
Depth
(ft-bgs)
Well
Yield
(gpm)
Well
Screen
Interval
(ft-bgs)
1 N/A Neck Road, Huntersville,
NC 28078
Gaston N/A Drinking 2,300 Northeast No data No data No data No data
Notes:
1. Map ID #s correspond to Figures 4-1 and 4-2.
Reported Private Water Supply Wells
Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin, August 18,
2015.
Table 4-2. Property Owner Addresses Contiguous to the Ash Basin Waste Boundary
Map ID
#
Parcel ID # Property Address
Street City State
1 4519520433 Horseshoe Bend Rd Mount Holly NC
2 4519429301 Horseshoe Bend Rd Mount Holly NC
3 4519730111 Horseshoe Bend Rd Mount Holly NC
4 4519542126 175 Steam Plant Rd Mount Holly NC
Notes:
1. Property owner addresses obtained from the Gaston County, NC GIS website.
2. Map ID #s correspond to Figure 4-6.

Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin, August 18, 2015.
Table 6-1. Soil Mineralogy Results
Quartz Feldspars Plagioclase Illite Muscovite/Illite Kaolinite Epidote Tremolite Vermiculite Talc Goethite Chlorite Biotite Calcite Gibbsite Mullite Amphibole Muscovite Smectite Magesioferrite Illite/Smectite Amorphous
AS-2S American Assay RB-01 90 35.1 22.7 ---35.6 ------6.7 ---------
C-2S American Assay RB-02 30.0-35.0 54.2 4.3 ---34.4 ------7.4 ---------
AB-7S American Assay RB-03 20.0-25.0 66.8 ----13 -----9.7 3.2 -1.5 6.1 ------
AB-8S American Assay RB-04 30.0-35.0 22.1 2.7 ---40.5 -----13 ----21.2 --0.7 --
GWA-2S American Assay RB-05 48.0-52.0 14.8 18.8 -3.5 -13.8 -------0.2 --32.9 -16 ---
GWA-5S American Assay RB-06 72.0-74.0 45 9.5 -16.9 -28.6 ----------------
GWA-7S American Assay RB-07 22.0-23.0 14.1 2.5 -15.3 -39.4 ----------23.8 --0.6 4.3 -
GWA-3S American Assay RB-08 26.0-29.0 11 40.1 -39.5 -8.5 ----------0.8 -----
GWA-9BR American Assay RB-09 14.0-17.0 13.1 0.7 -11.9 -59 -----------14.9 -0.7 --
AB-6D American Assay RB-10 88.5-90.0 38.1 --7 -47.4 -----0.4 -----7 ----
MW-9BR American Assay RB-11 10.0-12.0 9.3 --32.1 -29.6 -----1.6 -----27.1 ----
AB-2D PMET RB-15 83.5-85.0 8.7 -25 -6.7 6.9 10 7 1.1 ------------33.6
AB-1D PMET RB-16 78.5-80.0 0.6 -2.4 -16 9.9 4.5 18.2 2.1 ------------46.3
GWA-4S PMET RB-17 32.0-35.0 32 -32.2 -5.8 12.1 1.6 -----2.9 --------13.4
GWA-10S PMET RB-18 21.0-23.0 16.6 ----40 1.7 3.7 1.1 ------------36.9
GWA-8D PMET RB-19 19.0-20.0 11.4 ----28 -6.3 1.6 9.8 6.4 ----------36.5
AB-1D PMET RB-20 75.0-78.0 28.3 ---10.4 28.6 ----4.8 ----------27.9
Notes:
1. ft bgs = feet below ground surface
2. Chemical composition of constituent minerals is as follows: Quartz – SiO2, Feldspar – (K,Na)[AlSi3O8]-Ca[Al2Si2O8], Plagioclase – Na[AlSi3O8]-Ca[Al2Si2O8], Illite – K1-1.5Al4[Si7-6.5Al1-1.5O20](OH)4, Kaolinite – Al4[Si4O10](OH)8, Epidote – Ca2Fe+3Al2O•OH•Si2O7•SiO4, Tremolite – Ca2Mg5Si8O22(OH)2,
Vermiculite – (Mg,Ca)0.7(Mg,Fe+3,Al)6[(Al,Si)8O20](OH)4•8H2O, Talc – Mg3Si4O10(OH)2, Goethite – α-FeO•OH, Chlorite – (Mg,Al,Fe)12[(Si,Al)8O20](OH)16, Biotite – K2(Mg,Fe+2)6-4(Fe+3,Al,Ti)0-2[Si6-5Al2-3O20](OH,F)4, Calcite – CaCO3, Gibbsite – Al(OH)3, Mullite – 3Al2O3•2SiO2,
Amphibole – (Ca,Na,K,Mn)2-3(Mg,Fe+2,Fe+3,Al,Ti,Mn,Cr,Li,Zn)5(Si,Al)8O22(OH)2, Muscovite – K2Al4[Si6Al2O20](OH,F)4, Smectite – (½Ca,Na)0.7(Al,Mg,Fe)4[(Si,Al)8O20](OH)4•nH2O, Magnesioferrite – MgFe2+3O4
3. PMET notes that samples contain amorphous smectite clays, amorphous mica, and/or amorphous iron oxide/hydroxide, but does not distinguish between them
Boring ID Lab Performing
Analysis
Unique Lab
Identifier
Sample Depth
(ft bgs)
Soil Mineralogical Composition (wt %)
Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin, August 18, 2015.

Table 6-2. Soil Chemistry Results, Oxides
Boring ID Lab Performing
Analysis
Unique Lab Identifier Sample Depth (ft bgs) Oxide Composition, Loss on Ignition, Carbon, and Sulfur (wt. %)
Al2O3 BaO CaO Cr2O3 Fe2O3 K2O MgO MnO Na2O P2O5 SiO2 SrO TiO2 V2O5 LOI C S
AS-2S American Assay RB-01 90 24.45 0.05 0.67 <0.01 3.53 0.77 1.21 0.05 0.49 0.02 65.69 <0.01 0.57 <0.01 10.56 0.297 <0.005
C-2S American Assay RB-02 30.0-35.0 2.77 0.04 0.5 <0.01 6.3 0.33 0.67 0.04 0.15 0.02 71.15 <0.01 0.79 0.05 11.67 0.582 0.028
AB-7S American Assay RB-03 20.0-25.0 3.21 0.06 0.7 0.01 5.92 0.56 0.61 0.03 0.12 0.18 77.8 0.05 0.99 0.09 7.43 1.809 0.032
AB-8S American Assay RB-04 30.0-35.0 9.34 0.03 2.7 0.04 14.6 0.07 1.81 0.12 0.13 0.02 65.53 0.01 0.88 0.08 10.14 0.092 0.01
GWA-2S American Assay RB-05 48.0-52.0 20.87 0.06 4.9 <0.01 10.44 0.58 3.15 0.1 0.48 0.09 53.88 0.02 0.91 0.06 7.78 0.12 <0.005
GWA-5S American Assay RB-06 72.0-74.0 28.07 0.07 0.32 <0.01 5.59 0.2 0.43 0.08 0.03 0.04 59.54 <0.01 0.56 0.01 12 0.084 <0.005
GWA-7S American Assay RB-07 22.0-23.0 26.94 0.06 2.08 0.01 9.95 0.11 2.63 0.12 0.08 0.14 45.76 0.01 0.4 0.04 10.89 0.071 <0.005
GWA-3S American Assay RB-08 26.0-29.0 19.64 0.05 3.58 0.01 6.05 1.44 2.4 0.08 1.54 0.14 59.54 0.06 0.48 0.02 3.16 0.164 <0.005
GWA-9BR American Assay RB-09 14.0-17.0 24.2 0.03 0.56 0.02 12.3 0.47 0.91 0.1 0.18 0.14 51.17 <0.01 0.7 0.04 11.11 0.381 <0.005
AB-6D American Assay RB-10 88.5-90.0 24.38 0.08 0.34 <0.01 11.03 0.39 0.48 0.05 0.06 0.15 53.88 <0.01 0.76 0.04 10.57 0.126 <0.005
MW -9BR American Assay RB-11 10.0-12.0 26.41 0.05 0.37 0.01 8.32 0.54 0.49 0.03 0.15 0.11 53.14 <0.01 0.75 0.02 10.57 0.132 0.014
AB-2D American Assay RB-15 83.5-85.0 16.53 0.02 5.23 0.01 15.87 0.61 2.26 0.1 1.33 0.28 50.48 0.06 1.7 0.06 5.18 0.038 <0.005
AB-1D American Assay RB-16 78.5-80.0 21.54 0.04 4.41 0.01 6.33 1.47 5.46 0.09 0.6 0.01 53.47 0.02 0.26 0.02 7.07 0.024 <0.005
GWA-4S American Assay RB-17 32.0-35.0 15.34 0.04 2.39 0.02 2.12 0.92 0.76 0.02 1.53 0.02 65.13 0.04 0.27 0.01 2.59 0.026 <0.005
GWA-10S American Assay RB-18 21.0-23.0 22.86 0.02 1.35 0.01 10.62 0.09 1.54 0.08 0.09 0.06 52.14 0 0.78 0.05 9.64 0.034 <0.005
GWA-8D American Assay RB-19 19.0-20.0 17.19 0.01 1.48 0.05 14.1 0.2 6.17 0.15 0.17 0.1 51.81 0 0.28 0.01 8.87 0.069 <0.005
AB-1D American Assay RB-20 75.0-78.0 20.6 0.04 0.57 0.01 8.74 0.55 0.59 0.04 0.21 0.12 60.11 0 0.74 0.03 8.26 0.099 0.007
Notes:
1. ft bgs = feet below ground surface
Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin, August 18, 2015.
Table 6-3. Soil Chemistry Results, Elemental
Boring ID Unique Lab Identifier Lab Performing
Analysis
Sample Depth (ft bgs) Elemental Composition (ppm)
As Cd Ce Co Cu Ga La Mo Ni Pb Sb Se Sn W Zn Zr
AS-2S RB-01 American Assay 90 8 0.5 54 14 22 19 23 <1 18 15 5 8 <1 5 111 84
C-2S RB-02 American Assay 30.0-35.0 46 <0.2 72 19 42 34 35 3 17 22 2 <1 <1 4 55 7
AB-7S RB-03 American Assay 20.0-25.0 96 0.5 129 43 85 33 53 9 53 39 4 <1 3 4 81 122
AB-8S RB-04 American Assay 30.0-35.0 57 0.2 20 48 131 23 13 <1 76 8 4 <1 <1 <1 60 27
GWA-2S RB-05 American Assay 48.0-52.0 4 <0.2 26 36 239 14 11 <1 27 7 2 <1 1 <1 79 4
GWA-5S RB-06 American Assay 72.0-74.0 4 <0.2 53 32 38 29 16 <1 20 9 1 <1 <1 <1 30 2
GWA-7S RB-07 American Assay 22.0-23.0 4 <0.2 21 37 127 18 7 7 72 8 <1 <1 <1 <1 70 12
GWA-3S RB-08 American Assay 26.0-29.0 2 <0.2 57 18 34 17 24 17 48 6 <1 <1 1 1 65 10
GWA-9BR RB-09 American Assay 14.0-17.0 5 <0.2 53 40 100 20 20 6 72 12 <1 <1 1 <1 83 29
AB-6D RB-10 American Assay 88.5-90.0 6 <0.2 69 22 77 25 22 2 25 16 1 <1 2 2 75 34
MW -9BR RB-11 American Assay 10.0-12.0 3 <0.2 66 18 33 21 26 5 88 15 <1 <1 1 1 67 25
AB-2D RB-15 American Assay 83.5-85.0 8 <0.2 36 79 80 16 23 2 23 11 <1 <1 1 <1 100 6
AB-1D RB-16 American Assay 78.5-80.0 <1 <0.2 5 29 33 16 4 <1 47 8 <1 <1 <1 <1 35 6
GWA-4S RB-17 American Assay 32.0-35.0 3 <0.2 25 6 11 19 17 3 8 6 <1 <1 2 <1 28 2
GWA-10S RB-18 American Assay 21.0-23.0 6 <0.2 23 31 128 23 12 7 24 10 <1 1 1 <1 82 8
GWA-8D RB-19 American Assay 19.0-20.0 3 <0.2 12 140 114 11 11 <1 191 11 <1 <1 2 <1 97 9
AB-1D RB-20 American Assay 75.0-78.0 5 <0.2 28 22 52 22 12 1 26 16 <1 <1 1 <1 39 10
Notes:
1. ppm = parts per million
2. ft bgs = feet below ground surface
Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin, August 18, 2015.
Table 6-4. Weathered Rock Mineralogy Results
Boring
ID
Lab Performing
Analysis
Unique
Lab
Identifier
Sample
Depth
(ft bgs)
Mineralogical Composition (wt %)
Quartz Feldspars Muscovite/
Illite
Vermiculite/
Illite
Kaolinite Chlorite Smectite Total
AS-1D Technology of
Materials
RB-12 161.0-163.0 70 15 5 1 2 5 3 101
GWA-7D Technology of
Materials
RB-14 102.0-103.5 60 15 2 <1 1 15 8 101
GWA-7D Technology of
Materials
RB-21 177.7-179.1 50 17 5 <1 1 20 8 101
Notes:
1. Refer to Appendix H for analytical procedures.
2. Chemical composition of constituent minerals is as follows: Quartz – SiO2, Feldspar – (K,Na)[AlSi3O8]-Ca[Al2Si2O8], Muscovite – K2Al4[Si6Al2O20](OH,F)4, Illite
– K1-1.5Al4[Si7-6.5Al1-1.5O20](OH)4, Vermiculite – (Mg,Ca)0.7(Mg,Fe+3,Al)6[(Al,Si)8O20](OH)4•8H2O, Kaolinite – Al4[Si4O10](OH)8, Chlorite –
(Mg,Al,Fe)12[(Si,Al)8O20](OH)16, Smectite – (½Ca,Na)0.7(Al,Mg,Fe)4[(Si,Al)8O20](OH)4•nH2O

Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin, August 18, 2015.
Table 6-5. Chemical Composition of Weathered Rock Samples
Boring ID Lab Performing Analysis Unique Lab Identifier Sample Depth
(ft bgs)
Chemical Composition (wt %)
Na2O MgO Al2O3 SiO2 P2O5 S K2O CaO TiO2 Fe2O3 Cr2O3
AS-1D Technology of Materials RB-12 161.0-163.0 4.9 1.1 17.2 68.5 <0.2 <0.1 1.4 3.3 0.3 3.4 <0.2
GWA-7D Technology of Materials RB-14 102.0-103.5 1.9 6.8 18.1 49.8 <0.2 <0.1 1.2 7.8 1.0 13.2 <0.2
GWA-7D Technology of Materials RB-21 177.7-179.1 3.8 4.0 21.8 54.2 <0.2 <0.1 1.5 6.5 0.4 7.6 <0.2
Notes:
1. Refer to Appendix H for analytical procedures.
Table 6-6. Whole Rock Chemistry Results, OxidesAl2O3BaO CaO Cr2O3 Fe2O3K2O MgO MnO Na2O P2O5SiO2SrO TiO2V2O5LOI CSR-GWA-7BR-1 American AssayRB-22125.9-126.1 21.62 0.02 11.88 0.02 8.62 0.29 6.69 0.10 1.37 0.08 52.65 0.11 0.50 0.08 0.52 0.104 0.036R-GWA-9BR-1A American AssayRB-2399.0-99.2 16.69 0.03 8.66 0.02 10.31 1.10 7.80 0.18 1.49 0.07 53.91 0.10 0.67 0.04 1.17 0.121 0.054R-AB-3BR-2 American AssayRB-24188-188.3 18.58 0.02 9.67 0.02 9.21 0.65 5.61 0.11 1.46 0.11 55.45 0.11 0.66 0.06 1.67 0.116 0.225R-GWA-9BR-1B American AssayRB-2599.8-100.0 15.84 0.06 3.54 0.05 3.44 1.54 0.96 0.05 1.84 0.09 68.54 0.08 0.37 <0.01 0.84 0.123 0.025R-MW-9BR-1 American AssayRB-26146.3-146.55 15.36 0.04 4.00 0.04 2.57 1.07 1.12 0.06 1.98 0.07 65.46 0.08 0.33 0.01 1.33 0.173 <0.005R-AB-3BR-1 American AssayRB-27184.9-185.1' 17.11 <0.01 13.49 0.05 9.75 0.06 7.88 0.13 1.13 0.14 49.55 0.12 0.60 0.06 3.80 0.427 0.377R-MW-15BR-1 American AssayRB-2844.3-44.5 15.24 0.08 4.04 0.05 4.72 1.21 1.53 0.08 1.66 0.08 72.14 0.09 0.32 <0.01 2.24 0.062 2.371R-MW-7BR-1 American AssayRB-29210.3-210.5 17.33 0.04 4.48 0.04 2.63 1.20 1.35 0.05 1.88 0.09 68.31 0.09 0.36 <0.01 1.57 0.255 0.0251. ft bgs = feet below ground surface2. Refer to Appendix H for laboratory reportsBoring IDLab Performing AnalysisUnique Lab IdentifierSample Depth (ft bgs)Oxide Composition, Loss on Ignition, Carbon, and Sulfur (wt %)Page 1 of 1Source: HDR, Corrective Action Plan Part 2 Riverbend Steam Station Ash Basin, February 12, 2016, Appendix A CSA Supplement 1
Table 6-7. Whole Rock Chemistry Results, ElementalAs Cd Ce Co Cu Ga La Mo Ni Pb Sb Se Sn W Zn ZrR-GWA-7BR-1 American Assay RB-22 125.9-126.1 1 <0.2 3 32 91 17 6 1 27 9 2 <1 4 <1 142 7R-GWA-9BR-1A American Assay RB-23 99.0-99.2 1 <0.2 22 32 53 13 7 <1 24 11 2 <1 3 <1 98 6R-AB-3BR-2 American Assay RB-24 188-188.3 1 <0.2 28 29 75 15 8 <1 19 9 3 <1 4 <1 71 6R-GWA-9BR-1B American Assay RB-25 99.8-100.0 3 <0.2 49 6 17 14 18 2 9 14 2 <1 4 <1 78 11R-MW-9BR-1 American Assay RB-26 146.3-146.55 2 <0.2 26 6 7 15 12 <1 8 10 2 <1 3 <1 84 2R-AB-3BR-1 American Assay RB-27 184.9-185.1 2 <0.2 7 43 111 15 6 1 899414<1639R-MW-15BR-1 American Assay RB-28 44.3-44.5 2 <0.2 18 21 58 14 9 19 12 8 2 <1 4 <1 88 3R-MW-7BR-1 American Assay RB-29 210.3-210.5 4 <0.2 29 9 6 1681982<11<14121. ft bgs = feet below ground surface2. Refer to Appendix H for laboratory reportsBoring IDLab Performing AnalysisUnique Lab IdentifierSample Depth (ft bgs)Elemental Composition (ppm)Page 1 of 1Source: HDR, Corrective Action Plan Part 2 Riverbend Steam Station Ash Basin, February 12, 2016, Appendix A CSA Supplement 1
TABLE 6-8
HISTORIC WATER LEVEL MEASUREMENTS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 6-8 Historic Water Level Measurements Page 1 of 1
Well ID 7/8/2015 7/9/2015 7/10/2015 9/15/2015 6/15/2016 9/27/2016 11/2/2016 11/3/2016 2/6/2017 5/22/2017
AB-01D 666.20 ----665.44 663.51 662.88 662.65 --662.72 661.78 -4.42 193.0 198.0 Deep/ Weathered Rock
AB-01S 685.76 ----683.16 680.81 679.38 678.82 --677.71 676.52 -9.24 29.0 44.0 Shallow
AB-02D --678.97 --677.59 673.75 672.25 672.57 --672.37 670.46 -8.51 151.0 156.0 Deep/ Weathered Rock
AB-02S --677.58 --680.42 678.00 675.95 665.47 --674.87 673.32 -4.26 50.0 65.0 Shallow
AB-03BR ------683.18 698.96 694.90 --693.68 ----10.50 206.0 211.0 Bedrock
AB-03D 700.20 ----699.08 693.83 691.53 --692.20 -----8.00 173.0 178.0 Deep/ Weathered Rock
AB-03S 706.26 ----704.21 700.52 Dry --699.88 -----6.38 13.0 28.0 Shallow
AB-04D --702.92 --700.77 --694.36 --------NA 198.5 203.5 Deep/ Weathered Rock
AB-04S --706.14 --703.78 --698.62 --------NA 15.0 30.0 Shallow
AB-05D --677.13 --676.21 674.45 672.74 --------NA 154.0 159.0 Deep/ Weathered Rock
AB-05S --707.50 --704.27 702.13 Dry --------NA 9.0 24.0 Shallow
AB-05SL --706.87 --703.85 701.74 699.64 --------NA 47.0 57.0 Shallow
AB-06BRU 663.59 ----668.15 662.05 660.89 660.76 --661.95 659.71 -3.88 169.0 174.0 Bedrock
AB-06S 686.73 ----684.71 684.92 682.58 681.82 --681.61 680.00 -6.73 50.0 65.0 Shallow
AB-07D --713.48 --711.33 711.44 710.25 --------NA 142.0 147.0 Deep/ Weathered Rock
AB-07I --713.78 --711.71 655.47 710.37 --------NA 70.0 85.0 Deep/ Weathered Rock
AB-07S --714.42 --712.43 712.45 Dry --------NA 5.0 20.0 Shallow
AB-08D 658.58 ----657.42 657.64 656.34 --656.27 657.78 656.60 -1.98 91.0 96.0 Deep/ Weathered Rock
AB-08S --------------------NA 13.0 28.0 Shallow
AS-01D --675.38 --674.00 ------------NA 171.0 176.0 Deep/ Weathered Rock
AS-01S --678.17 --676.83 ------------NA 81.0 96.0 Shallow
AS-02D --695.47 --694.35 ------------NA 185.0 190.0 Deep/ Weathered Rock
AS-02S --694.09 --693.12 ------------NA 74.0 89.0 Shallow
AS-03D --712.53 --709.69 ------------NA 139.0 144.0 Deep/ Weathered Rock
AS-03S --713.23 ----------------NA 58.8 73.8 Shallow
AS-03SA ---65.54 ---68.34 ------------NA ----Shallow
BG-01D --674.44 --670.06 673.06 671.02 670.97 --671.39 671.55 -2.89 194.2 199.2 Deep/ Weathered Rock
BG-01S --670.96 --669.36 672.73 670.09 670.05 --670.72 671.36 0.40 29.7 44.7 Shallow
BG-02BR ------647.62 650.33 648.25 648.50 --649.17 649.42 1.80 203.0 208.0 Bedrock
BG-02D --647.96 --648.08 650.94 648.90 638.95 --649.35 649.70 1.74 155.0 160.0 Deep/ Weathered Rock
BG-02S --651.82 --648.98 651.87 649.97 649.75 --649.87 650.26 -1.56 49.0 65.0 Shallow
BG-03D --644.85 --641.83 645.75 644.83 645.13 --646.09 646.07 1.22 100.0 105.0 Deep/ Weathered Rock
BG-03S --644.96 --643.89 645.98 644.75 645.25 --646.35 646.23 1.27 22.0 37.0 Shallow
BG-04BR ----------586.89 582.38 --582.94 598.51 NA 167.8 172.8 Bedrock
BG-04D ----------664.41 663.48 --662.08 662.02 NA 130.7 140.7 Deep/ Weathered Rock
BG-04S ----------664.05 663.11 --661.74 661.75 NA 52.6 67.6 Shallow
BG-05BR --------681.58 680.88 680.36 --680.18 680.39 NA 128.0 133.0 Bedrock
BG-05D ----------683.85 683.55 --683.00 683.34 NA 98.0 103.0 Deep/ Weathered Rock
C-01BRU ------595.46 600.34 628.48 612.74 --630.84 640.42 44.96 115.0 120.0 Bedrock
C-01S 653.31 ----651.80 654.06 652.06 652.85 --654.85 654.22 0.91 5.0 15.0 Shallow
C-02D 653.47 ----652.63 654.20 653.04 653.19 --654.09 653.93 0.46 133.0 138.0 Deep/ Weathered Rock
C-02S 656.43 ----655.39 657.21 655.52 656.16 --657.68 657.11 0.68 18.0 33.0 Shallow
GWA-01BRU 662.07 ----660.42 662.03 658.63 658.04 --657.45 657.26 -4.81 72.0 77.0 Bedrock
GWA-01S 661.15 ----659.73 661.40 658.08 657.52 --656.98 656.87 -4.28 28.0 43.0 Shallow
GWA-02BR 645.24 ----644.62 645.52 644.65 --644.63 645.42 644.98 -0.26 115.0 120.0 Bedrock
GWA-02BRU ------638.64 644.73 639.95 --635.84 644.94 644.99 6.35 77.0 82.0 Bedrock
GWA-02S 645.13 ----644.35 645.42 640.52 --644.51 645.37 640.88 -4.25 35.0 50.0 Shallow
GWA-03BR --------------------NA 79.0 89.0 Bedrock
GWA-03D 645.50 ----644.79 646.23 645.08 645.14 --645.89 645.86 0.36 42.0 47.0 Deep/ Weathered Rock
GWA-03SA 645.52 ----644.81 646.21 645.05 645.14 --645.91 645.86 0.34 23.0 39.0 Shallow
GWA-04BR ------666.15 674.56 670.22 666.50 --669.62 671.00 4.85 159.0 164.0 Bedrock
GWA-04D ----673.88 668.81 673.23 669.28 669.23 --670.13 670.90 -2.98 120.0 125.0 Deep/ Weathered Rock
GWA-04S ----674.17 668.84 673.22 669.27 669.49 --671.15 671.64 -2.53 17.0 32.0 Shallow
GWA-05D ------715.57 719.41 716.81 716.04 --714.33 713.12 -2.45 212.0 217.0 Deep/ Weathered Rock
GWA-05S --710.41 --710.01 723.29 721.46 719.77 --709.93 Dry -0.48 60.0 75.0 Shallow
GWA-06D --714.75 --713.34 715.37 713.24 712.75 --711.21 709.51 -5.24 143.0 148.0 Deep/ Weathered Rock
GWA-06S --715.48 --714.04 716.08 713.85 713.43 --711.76 710.14 -5.34 45.0 60.0 Shallow
GWA-07BR --671.01 --668.35 670.47 666.27 667.42 --670.34 670.64 -0.37 127.0 132.0 Bedrock
GWA-07D --670.98 --668.30 670.87 666.53 667.66 --670.54 670.92 -0.06 100.0 105.0 Deep/ Weathered Rock
GWA-07S --670.18 --667.40 671.39 Dry 668.13 --671.96 672.69 2.51 5.0 20.0 Shallow
GWA-08D 671.08 ----668.92 667.24 663.05 663.89 --665.87 664.94 -6.14 111.0 116.0 Deep/ Weathered Rock
GWA-08S 671.26 ----662.20 667.15 Dry 662.47 --664.94 664.35 -6.91 8.0 23.0 Shallow
GWA-09BR Dry ----Dry Dry Dry Dry --Dry Dry NA 106.0 111.0 Bedrock
GWA-09D ------645.67 652.36 650.98 650.95 --651.78 651.38 5.71 62.0 67.0 Deep/ Weathered Rock
GWA-09S 648.24 ----647.93 647.58 647.28 647.18 --647.58 648.11 -0.13 5.0 15.0 Shallow
GWA-10BRU 643.92 ----643.37 644.44 644.17 642.89 --644.78 644.53 0.61 133.5 138.5 Bedrock
GWA-10S 643.79 ----643.46 --644.09 644.02 --644.99 644.53 0.74 7.5 22.5 Shallow
GWA-11D --------645.01 644.23 643.94 --644.86 644.78 NA 109.0 114.0 Deep/ Weathered Rock
GWA-11S --------646.53 645.55 645.42 --646.04 646.10 NA 16.0 31.0 Shallow
GWA-12D --------662.77 660.99 660.88 --661.15 661.47 NA 130.0 135.0 Deep/ Weathered Rock
GWA-12S --------660.37 658.56 658.63 --658.89 659.13 NA 15.0 30.0 Shallow
GWA-13D ----------691.76 691.06 --689.75 688.91 NA 276.7 281.7 Deep/ Weathered Rock
GWA-13S ----------692.79 691.87 --690.37 688.58 NA 44.4 59.4 Shallow
GWA-14D ----------711.94 711.28 --709.92 708.19 NA 203.0 208.0 Deep/ Weathered Rock
GWA-14S --------715.36 713.18 697.46 --697.74 709.72 NA 62.0 80.0 Shallow
GWA-15D --------------------NA 104.0 114.0 Deep/ Weathered Rock
GWA-15S --------------------NA 30.0 45.0 Shallow
GWA-20BR ------690.79 693.58 691.00 695.74 --688.93 688.05 -2.74 300.6 305.6 Bedrock
GWA-20D ------692.19 694.47 691.97 691.17 --689.54 689.29 -2.90 253.0 258.0 Deep/ Weathered Rock
GWA-20S ------693.86 696.22 693.59 692.47 --690.85 689.26 -4.60 37.0 53.0 Shallow
GWA-21BR --------------------NA 346.0 351.0 Bedrock
GWA-21D --------------------NA 274.0 279.0 Deep/ Weathered Rock
GWA-21S --------------------NA 57.0 72.0 Shallow
GWA-22BR-A ------705.16 706.78 703.64 703.00 --701.88 700.58 -4.58 269.0 274.0 Bedrock
GWA-22D --709.29 --705.73 707.19 704.02 703.29 --702.18 700.89 -8.40 198.0 203.0 Deep/ Weathered Rock
GWA-22S --712.92 --709.39 710.29 706.84 706.17 --704.86 704.58 -8.34 40.0 55.0 Shallow
GWA-23BR --703.38 --699.21 702.37 699.74 698.70 --697.07 695.91 -7.47 285.0 290.0 Bedrock
GWA-23D --704.94 --702.74 704.05 701.19 700.19 --698.73 697.63 -7.31 221.0 226.0 Deep/ Weathered Rock
GWA-23S --705.89 --704.00 705.07 702.15 700.98 --699.71 698.59 -7.30 33.0 48.0 Shallow
MW-01D 649.95 ----649.19 649.82 649.29 --649.19 649.86 649.37 -0.58 54.0 62.0 Deep/ Weathered Rock
MW-01S 652.58 ----651.92 651.95 651.67 --651.36 651.93 651.39 -1.19 5.0 15.0 Shallow
MW-02D 687.39 ----685.55 684.39 669.01 680.23 --680.48 679.34 -8.05 83.0 88.0 Deep/ Weathered Rock
MW-02S 687.03 ----686.94 687.17 Dry 687.13 --687.10 Dry 0.07 15.0 25.0 Shallow
MW-02SA ----------682.15 681.81 --682.23 681.00 NA 44.7 59.7 Shallow
MW-03D 652.45 ----651.76 651.94 651.38 651.02 --651.71 651.36 -1.09 29.5 34.5 Deep/ Weathered Rock
MW-03S 645.06 ----644.82 645.54 645.27 645.18 --646.09 645.67 0.61 4.0 14.0 Shallow
MW-04D 647.32 ----606.19 647.39 646.95 646.82 --647.57 647.17 -0.15 55.0 60.0 Deep/ Weathered Rock
MW-04S 648.16 ----647.83 648.15 Dry 647.78 --648.52 647.96 -0.20 10.0 20.0 Shallow
MW-05D 647.66 ----646.80 647.56 646.85 646.66 --647.39 647.21 -0.45 74.0 79.0 Deep/ Weathered Rock
MW-05S 643.55 ----643.28 644.02 644.30 643.84 --644.50 644.86 1.31 5.0 15.0 Shallow
MW-06D 650.63 ----649.00 650.00 649.20 649.01 --649.70 649.40 -1.23 69.5 74.5 Deep/ Weathered Rock
MW-06S 649.73 ----648.03 648.40 647.38 647.61 --648.27 648.13 -1.60 5.0 15.0 Shallow
MW-07BR --711.76 --710.24 712.11 709.76 709.26 --708.06 707.94 -3.82 196.0 201.0 Bedrock
MW-07D --712.05 --710.55 712.39 710.12 709.57 --708.26 708.12 -3.93 95.0 100.0 Deep/ Weathered Rock
MW-07SR --712.02 --710.64 712.47 710.18 703.62 --708.27 708.10 -3.92 43.0 63.0 Shallow
MW-08D --705.55 ------701.80 699.96 --699.54 698.54 -7.01 161.0 171.0 Deep/ Weathered Rock
MW-08I --707.16 ------703.29 702.41 --703.66 700.08 -7.08 98.0 118.0 Deep/ Weathered Rock
MW-08S --709.86 ------702.26 ----703.28 Dry -6.58 35.0 55.0 Shallow
MW-09 647.74 ----647.13 648.09 647.62 --647.51 648.27 648.09 0.35 13.0 28.0 Shallow
MW-09BR 648.72 ----648.10 649.11 648.58 --648.46 649.35 649.14 0.42 147.0 152.0 Bedrock
MW-09D 647.93 ----647.34 648.30 647.88 --647.75 648.60 648.41 0.48 141.0 146.0 Deep/ Weathered Rock
MW-10 643.74 ----643.06 --644.00 --643.84 644.70 645.48 1.74 13.0 18.0 Shallow
MW-11DR 664.59 ----662.80 --660.35 659.89 --659.84 659.30 -5.29 35.0 40.0 Deep/ Weathered Rock
MW-11SR 664.68 ------------------NA 15.0 30.0 Shallow
MW-13 643.07 ----642.49 --643.90 643.25 --644.14 644.34 1.27 3.0 18.0 Shallow
MW-14 (MW-14D)652.62 ----651.39 --649.82 649.94 --651.28 651.21 -1.41 3.0 18.0 Deep/ Weathered Rock
MW-15 643.74 ----642.98 644.32 643.67 643.46 --644.35 644.22 0.48 5.0 15.0 Shallow
MW-15BR 643.95 ----643.26 644.40 643.70 643.58 --644.57 644.04 0.09 56.0 61.0 Bedrock
MW-15D 643.84 ----643.03 644.32 643.66 643.50 --644.32 644.23 0.39 41.0 46.0 Deep/ Weathered Rock
OB-01 --707.75 --705.53 --704.59 703.98 --702.70 702.61 -5.14 33.0 48.0 Shallow
OB-02 --675.98 --673.70 --673.81 673.13 --673.29 673.22 -2.76 39.0 54.0 Shallow
Prepared by: KDF Checked by: WJW
Notes:
-- - Not Applicable
1 - a negative post excavation change value rrepresents a decrease in water level
Screened
Interval
(Feet, BGS)
Monitoring ZoneWater Level (Feet, MSL) Post Excavation
Change (feet)1
TABLE 6-9
SUMMARY OF HORIZONTAL HYDRAULIC GRADIENT AND VELOCITY CALCULATIONS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 6-9 Horizontal Groundwater Gradient Calcs Page 1 of 1
Ash Fill Alluvium M1 Deep Bedrock
NE GWA-22S to GWA-9S 0.018 29.91 236.39 34.53 50.79 --
N GWA-22S to MW-15 0.016 25.96 205.18 29.97 44.09 --
NW GWA-22S to C-2S 0.043 69.69 550.89 80.47 118.37 --
NW C-2S to GWA-3SA 0.012 19.69 155.63 22.73 33.44 --
NW GWA-22S to GWA-3SA 0.029 47.67 376.85 55.05 80.98 --
NW MW-7SR to GWA-2S 0.026 42.26 334.09 48.80 71.79 --
NW MW-7SR to AB-6S 0.014 23.18 183.25 26.77 39.38 --
NW AB-6S to MW-1S 0.094 153.00 1209.43 176.66 259.88 --
NW MW-7SR to MW-1S 0.025 41.11 324.94 47.46 69.82 --
NE GWA-22D to GWA-9D 0.016 ----50.41 -
N GWA-22D to MW-15D 0.015 ----46.74 -
NW GWA-22D to C-2D 0.042 ----130.51 -
NW C-2D to GWA-3D 0.009 ----29.08 -
NW GWA-22D to GWA-3D 0.027 ----86.09 -
NW MW-7D to MW-1D 0.026 ----81.50 -
NE GWA-22BR to GWA-9BR 0.049 -----a
N GWA-22BR to MW-15BR 0.015 -----a
NW GWA-22BR to GWA-3BR 0.027 -----a
NW MW-7BR to GWA-2BR 0.024 -----a
NW MW-7S to AB-6BRU 0.025 -----a
Prepared by: JYT Checked by: WJW
Notes:
ft = feet
yr = year
Water level measurements used for these calculations were collected on May 22, 2017
Hydraulic conductivties and effective porosites taken from HDR 2015 CSA Report
a = velocity was not calculated for the bedrock flow layer
Horizontal Groundwater Gradients and Velocities
Shallow
Deep
Bedrock
Direction Data Points Gradient
(ft per ft)
Velocity (ft per yr)
TABLE 6-10
HYDRAULIC GRADIENTS - VERTICAL
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\
Table 6-10 Hydraulic Gradients - Vertical Page 1 of 1
Well ID Potential Vertical Gradient Direction
AB-01S to AB-01D 0.093 Downward
AB-02S to AB-02D 0.030 Downward
AB-08S to AB-08D -0.026 Upward
BG-01S to BG-01D -0.001 Upward
BG-02S to BG-02D 0.006 Downward
BG-03S to BG-03D 0.002 Downward
BG-04S to BG-04D -0.004 Upward
C-02S to C-02D 0.029 Downward
GWA-03SA to GWA-03D 0.000 Upward
GWA-04S to GWA-04D 0.008 Downward
GWA-05S to GWA-05D -0.019 Upward
GWA-06S to GWA-06D 0.007 Downward
GWA-07S to GWA-7D 0.020 Downward
GWA-08S to GWA-08D -0.006 Upward
GWA-09S to GWA-09D -0.060 Upward
GWA-11S to GWA-11D 0.015 Downward
GWA-12S to GWA-12D -0.021 Upward
GWA-13S to GWA-13D -0.001 Upward
GWA-14S to GWA-14D 0.011 Downward
GWA-15S to GWA-15D -0.022 Upward
GWA-20S to GWA-20D 0.000 Upward
GWA-22S to GWA-22D 0.024 Downward
GWA-23S to GWA-23D 0.005 Downward
MW-01S to MW-01D 0.042 Downward
MW-02SA to MW-02D 0.047 Downward
MW-03S to MW-03D -0.243 Upward
MW-04S to MW-04D 0.019 Downward
MW-05S to MW-05D -0.035 Upward
MW-06S to MW-06D -0.021 Upward
MW-07SR to MW-07D 0.005 Downward
MW-08I to MW-08D 0.027 Downward
MW-09 to MW-09D -0.004 Upward
MW-15 to MW-15D 0.000 Upward
BG-02D to BG-02BR 0.006 Downward
BG-05D to BG-05BR 0.098 Downward
GWA-03D to GWA-03BR -0.056 Upward
GWA-04D to GWA-04BR -0.003 Upward
GWA-07D to GWA-07BR 0.010 Downward
GWA-20D to GWA-20BR 0.027 Downward
GWA-22D to GWA-22BR-A 0.004 Downward
GWA-23D to GWA-23BR 0.027 Downward
MW-07D to MW-07BR 0.001 Downward
MW-09D to MW-09BR -0.016 Upward
MW-15D to MW-15BR 0.013 Downward
AB-06S to AB-06BRU 0.178 Downward
C-01S to C-01BRU 0.127 Downward
GWA-01S to GWA-01BRU -0.010 Upward
GWA-02S to GWA-02BR -0.055 Upward
GWA-10S to GWA-10BRU 0.000 N/A
Produced by: WJW Checked by: ALA
Shallow to Deep
Bedrock
Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin, August 18, 2015.Page 1 of 1
Hydrostratigraphic Unit N
Geometric
Mean
(cm/sec)
Geometric
Mean + 1SD
(cm/sec)
Geometric
Mean - 1SD
(cm/sec)
Geometric
Median
(cm/sec)
Minimum
(cm/sec)
Maximum
(cm/sec)
Ash 44 1.1E-03 6.0E-03 2.1E-04 1.3E-03 3.0E-05 1.7E-02
Fill 14 4.3E-05 1.5E-04 1.3E-05 5.4E-05 5.4E-06 2.4E-04
Alluvium (S)11 4.3E-04 4.5E-03 4.0E-05 9.2E-04 7.1E-06 2.6E-02
M1 32 3.8E-04 2.6E-03 5.4E-05 9.2E-04 8.6E-06 1.7E-02
M2 19 2.7E-04 2.3E-03 3.2E-05 2.1E-04 5.4E-06 1.5E-02
Transition Zone (TZ)18 7.6E-05 3.8E-04 1.5E-05 9.8E-05 5.9E-06 1.2E-03
Bedrock (BR)34 1.7E-05 1.6E-04 1.8E-06 1.2E-05 2.2E-07 1.5E-03
Notes:
1. Hydraulic Conductivity, ‘k,’ values have an approximate lognormal distribution. Geometric mean, median, and standard deviation
estimated by taking the log of the values and running standard statistics on the log values, then converting those values back.
2. Dataset derived from Riverbend CSA Investigation and historical reports. Refer to tables 11-4 and 11-6 for historic conductivity data.
3. Ash dataset derived from Riverbend CSA investigation (N=2), Allen (N=13), Buck (N=17), and Cliffside (N=12).
4. Fill dataset derived from Riverbend CSA investigation (N= 3), Allen (N=5), Cliffside (N=4), and Dan River (N=2)
5. Alluvium dataset derived from Riverbend CSA investigation (N=3), Allen (N=2), Cliffside (N=3), and Dan River (N=3).
Table 6-11. Hydrostratigraphic Layer Properties - Horizontal Hydraulic Conductivity
Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin,
August 18, 2015 Page 1 of 1
Table 6-12. Hydrostratigraphic Layer Properties - Vertical Hydraulic Conductivity
Hydrostratigraphic Unit N
Geometric
Mean
(cm/sec)
Geometric
Mean + 1SD
(cm/sec)
Geometric
Mean - 1SD
(cm/sec)
Geometric
Median
(cm/sec)
Minimum
(cm/sec)
Maximum
(cm/sec)
Ash 45 1.1E-04 5.8E-04 2.1E-05 1.2E-04 3.0E-06 3.1E-03
Fill 24 8.4E-06 5.3E-05 1.3E-06 9.99E-06 1.1E-04 1.1E-04
Alluvium (S)10 2.7E-06 6.0E-05 1.2E-07 1.6E-06 4.6E-08 6.2E-04
M1 26 8.2E-06 7.4E-05 9.1E-07 7.2E-06 7.3E-08 2.4E-04
M2 3 5.2E-05 3.2E-04 8.3E-06 2.0E-05 1.6E-05 4.3E-04
Transition Zone (TZ)0 ------
Bedrock (BR)0 ------
Notes:
1. Hydraulic Conductivity, ‘k,’ values have an approximate lognormal distribution. Geometric mean, median, and standard deviation
estimated by taking the log of the values and running standard statistics on the log values, then converting those values back.
2. Dataset derived from CSA Investigation and historical reports. Refer to tables 11-4 and 11-6 for historic conductivity data.
3. Ash dataset derived from Riverbend CSA investigation (N=4), Allen (N=10), Buck (N=11), Cliffside (N=14), and Dan River (N=6).
4. Fill dataset derived from Riverbend CSA investigation (N=3), Allen (N=5), Buck (N=4), Cliffside (N=9), and Dan River (N=3).
3. Alluvium dataset derived from CSA Investigation Sites Allen (N=3), Cliffside (N=3), and Dan River (N=4).
4. Vertical hydraulic conductivity values for the TZ and BR could not be measured in the field or laboratory. Vertical
and horizontal conductivity for these layers are unlikely to be equal. Consider to be equal as an initial assumption and adjust as
necessary during flow model calibration
Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin,
August 18, 2015

Table 6-13. Estimated Effective Porosity/Specific Yield and Specific Storage for Upper Hydrostratigraphic
Units (A, F, S, M1, and M2)
Effective Porosity/Specific Yield (%) Specific Storage
(1/ft)

Hydrostratigraphic
Unit N Mean
(%)
Median
(%)
Mean + 1SD
(%)
Mean - 1SD
(%)
Minimum
(%)
Maximum
(%)
Ash 6 17.0% 17.0% 22.0% 12.0% 10.0% 24.0% -
Fill 6 2.6% 2.5% 3.6% 1.6% 1.3% 4.0% 6.1E-05 - 4.0E-05
Alluvium (S) 17 17.8% 18.5% 29.6% 6.1% 3.0% 40.0% 3.0E-04 - 1.5E-05
M1 25 12.1% 12.0% 19.9% 4.3% 0.8% 26.0% 3.0E-04 - 1.5E-05
M2 7 18.6% 17.5% 26.1% 11.2% 10.0% 30.0% 1.5E-05 - 6.2E-05
Notes:
1. Effective porosity/specific yield estimated from soil testing using Fetter/Bear Diagrams (Johnson, 1967).
2. Effective porosity and specific yield are not synonymous. For practical purposes, they may be estimated as approximately equal in
value.
3. Specific Storage ranges based on published values (Domenico and Mifflin, 1965). Alluvium and M1 fall within the same range of values.
4. Initial data from Allen (N=5), Buck (N=2), Cliffside-Rogers (N=2), and Dan River (N=8) CSA Investigations were used in the statistical
analysis for alluvium effective porosity/specific yield.
Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin,
August 18, 2015
Table 6-14. Total Porosity for Upper Hydrostratigraphic Units (A, F, S, M1, and M2)
Hydrostratigraphic Unit N Mean
(%)
Median
(%)
Mean +
1SD (%)
Mean -
1SD (%)
Minimum
(%)
Maximum
(%)
Ash 6 45.2% 44.3% 47.0% 43.3% 43.5% 48.2%
Fill 4 45.0% 45.3% 47.8% 42.2% 41.4% 48.0%
Alluvium (S) 15 43.9% 44.0% 46.1% 41.7% 38.3% 47.4%
M1 27 46.2% 46.0% 50.5% 41.9% 37.4% 55.4%
M2 25 42.8% 43.5% 45.3% 40.4% 36.5% 46.9%
Notes:
1. Total porosity estimated from soil testing, using both Fetter/Bear Diagrams (Johnson, 1967) and results from
Laboratory Conductivity testing.
2. Initial data from Allen (N=6), Buck (N=14), and Cliffside-Rogers (N=5) CSA Investigations were used in
conjunction with two Riverbend samples in the statistical analysis for M2 total porosity.
3. Initial data from Allen (N=6), Buck (N=1), Cliffside-Rogers (N=2), and Dan River (N=6) CSA Investigations used
in the statistical analysis for alluvium total porosity.
Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin, August 18, 2015
Table 6-15. Field Permeability Test Results
Borehole Test Category Depth 1 of Test
(ft bgs)
Depth 2 of Test
(ft bgs)
Vertical
Hydraulic
Conductivity 'k'

Horizontal Hydraulic Conductivity 'k'
(cm/sec)
Hydrostratigraphic
Layer
AB-5D Well Point - Falling Head 153 159 - 1.60E-05 TZ
AB-5SL Flush Bottom 35 - 1.50E-04 - A
AB-5SL Flush Bottom 63 - 1.20E-04 - M1
AB-5SL Well Point - Falling Head 37 42 - 7.80E-06 A
AB-7D Well Point - Falling Head 131 138 - 1.40E-04 M2
AS-2D Well Point - Falling Head 177 183 - 1.30E-05 TZ
BG-1S Flush Bottom 40 - 2.00E-05 - M1
BG-1S Flush Bottom 12 - 4.50E-06 - M1
BG-1S Well Point - Falling Head 40 45 - 5.00E-05 M1
BG-1S Well Point - Falling Head 12 16.3 - 5.90E-05 M1
BG-2BR Packer Test 203 213 - 6.80E-06 BR
BG-2BR Packer Test 193.5 200 - 9.50E-06 BR
BG-2BR Packer Test 185 191.5 - 6.70E-07 BR
BG-3D Well Point - Falling Head 96.4 101.4 - 1.50E-05 TZ
GWA-10D Well Point - Constant Head 131.5 136.5 - 3.20E-04 BR
GWA-20BR Packer Test 275.5 282 - 2.00E-05 BR
GWA-20BR Packer Test 284.5 291 - No Take at Maximum Pressure of 180 psi BR
GWA-20BR Packer Test 300.5 307 - No Take at Maximum Pressure of 135 psi BR
GWA-2BR Well Point - Falling Head 74 80 - 1.70E-05 BR
GWA-2BR Packer Test 115.6 121.8 - 5.10E-06 BR
GWA-2BR Packer Test 108 114.2 - 3.70E-07 BR
GWA-2BR Packer Test 97 103.2 - 2.20E-07 BR
GWA-3D Well Point - Falling Head 39 45 - 1.70E-04 M2
GWA-4D Well Point - Falling Head 118 123 - 1.80E-05 TZ
GWA-5D Well Point - Falling Head 191 197 - 9.10E-06 M2
GWA-6D Well Point - Falling Head 143 148 - 7.60E-05 TZ
GWA-7BR Packer Test 145 151.2 - 2.70E-06 BR
GWA-7BR Packer Test 125 131.2 - 2.60E-03 BR
GWA-9BR Packer Test 107 113.2 - 2.00E-06 BR
GWA-9BR Packer Test 95 101.2 - 2.80E-06 BR
GWA-9BR Packer Test 76 82.2 - 6.80E-06 BR
GWA-9D Well Point - Falling Head 52 57 - 5.40E-06 M2
MW -7BR Packer Test 220 226.2 - 8.80E-06 BR
MW -7BR Packer Test 205 211.2 - 1.40E-05 BR
MW -7BR Packer Test 195 201.2 - 1.90E-04 BR
MW -9BR Flush Bottom 30 - 5.80E-05 - M1
MW -9BR Flush Bottom 65 - 4.30E-04 - M2
MW -9BR Well Point - Falling Head 30 35 - 7.00E-05 M1
MW -9BR Well Point - Falling Head 65 70 - 6.90E-05 M2
MW -9BR Packer Test 154 160.2 - 5.10E-06 BR
MW -9BR Packer Test 147 153.2 - 4.60E-05 BR
Notes:
1. Refer to Section 11.2.1 for discussion of field procedures
2. Refer to Appendix H for calculation worksheets
3. For the pressure test, the thickness of saturated material above a relatively impermeable bed is assumed to be 600 feet for a fractured bedrock system. Water
flow at this depth or greater in such systems is well documented in the Piedmont region (Daniel et al., 1989)
TABLE 6-16
IN-SITU HYDRAULIC CONDUCTIVITY RESULTS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
Measured Geometric
Mean Measured Geometric
Mean
AB-3S Slug Out Test 1 3.18E-04 --9.02E-01 --
AB-4S Slug Out Test 1 3.37E-05 --9.56E-02 --
Slug In Test 1 2.55E-04 7.23E-01
Slug Out Test 2 4.84E-04 1.37E+00
Slug In Test 1 4.44E-04 1.26E+00
Slug Out Test 2 2.66E-04 7.54E-01
Slug In Test 1 2.18E-03 6.19E+00
Slug Out Test 2 6.41E-03 1.82E+01
Slug In Test 1 1.10E-03 3.10E+00
Slug Out Test 2 9.87E-04 2.80E+00
5.46E-04 1.55E+00
6.41E-03 1.82E+01
3.37E-05 9.56E-02
Prepared by: WJW Checked by: LWD
Notes:
Slug tests were analyzed using the Bouwer-Rice mathmatical model, unless where indicated.
cm/sec - centimeter per second
ft/day - feet per day
-- No statistics necessary, when only one slug test analyzed
Ash Pore Water
3.74E-03 1.06E+01AB-7S
1.04E-03
3.51E-04 9.95E-01
2.95E+00
HIGHEST CONDUCTIVITY
LOWEST CONDUCTIVITY
AB-5S
3.44E-04 9.74E-01AB-5SL
C-1S
Well ID Slug Test
Number
Hydraulic Conductivity
(cm/sec)
Hydraulic Conductivity
(ft/day)Slug
Test
GEOMETRIC MEAN
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 6-16
In-Situ Hydraulic ConductivitiesSummary Results by Unit Page 1 of 6
TABLE 6-16
IN-SITU HYDRAULIC CONDUCTIVITY RESULTS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
Measured Geometric
Mean Measured Geometric
Mean
AB-1S Slug Out Test 1 1.91E-05 --5.41E-02 --
Slug In Test 1 2.64E-05 7.49E-02
Slug-Out Test 2 1.40E-05 3.97E-02
Slug In Test 1 9.23E-05 2.62E-01
Slug Out Test 2 8.77E-05 2.48E-01
Slug In Test 1 2.50E-03 7.10E+00
Slug Out Test 2 1.18E-03 3.34E+00
Slug In Test 1 5.93E-05 1.68E-01
Slug Out Test 2 8.25E-05 2.34E-01
Slug In Test 1 1.26E-04 3.56E-01
Slug Out Test 2 3.57E-04 1.01E+00
Slug In Test 1 9.19E-04 2.60E+00
Slug Out Test 2 6.99E-04 1.98E+00
Slug In Test 1 4.18E-05 1.18E-01
Slug Out Test 2 1.29E-04 3.66E-01
AS-3S-A Slug In Test 1 8.48E-05 --2.40E-01 --
Slug In Test 1 1.18E-04 3.33E-01
Slug Out Test 2 7.79E-05 2.21E-01
BG-2S Slug Out Test 1 2.28E-05 --6.46E-02 --
Slug In Test 1 7.38E-05 2.09E-01
Slug Out Test 2 2.41E-04 6.83E-01
Slug In Test 1 3.74E-05 1.06E-01
Slug Out Test 2 3.99E-05 1.13E-01
Slug In Test 1 7.00E-04 1.98E+00
Slug Out Test 2 1.69E-03 4.80E+00
Slug In Test 1 1.60E-03 4.53E+00
Slug Out Test 2 6.09E-03 1.73E+01
Slug In Test 1 3.89E-03 1.10E+01
Slug Out Test 2 2.62E-02 7.43E+01
Slug In Test 1 1.15E-03 3.27E+00
Slug Out Test 2 2.70E-03 7.65E+00
GWA-4S Slug Out Test 1 1.45E-04 --4.10E-01 --
Slug In Test 1 2.13E-04 6.03E-01
Slug Out Test 2 5.52E-04 1.56E+00
GWA-7S Slug Out Test 1 2.23E-03 --6.31E+00 --
Slug In Test 1 7.76E-04 2.20E+00
Slug Out Test 2 1.10E-03 3.13E+00
Slug In Test 1 3.94E-03 1.12E+01
Slug Out Test 2 4.20E-03 1.19E+01
Prepared by: WJW Checked by: LWD
9.25E-04 2.62E+00GWA-8S
4.07E-03 1.15E+01GWA-9S
3.86E-05 1.10E-01BG-4S
6.99E-05 1.98E-01AB-7I
9.57E-05 2.71E-01BG-1S
2.12E-04 6.00E-01AS-1S
1.72E-03 4.87E+00AB-8S
1.09E-03 3.09E+00C-2S
3.12E-03
3.43E-04 9.71E-01GWA-6S
1.01E-02 2.86E+01GWA-2S
1.76E-03 5.00E+00GWA-3S-A
8.84E+00GWA-1S
1.33E-04 3.78E-01BG-3S
7.34E-05 2.08E-01AS-3S
8.01E-04
Slug Test
Number
Hydraulic Conductivity
(cm/sec)
Saprolite
9.00E-05 2.55E-01AB-6S
2.27E+00AS-2S
Hydraulic Conductivity
(ft/day)
5.45E-021.92E-05AB-2S
Well ID Slug
Test
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 6-16
In-Situ Hydraulic ConductivitiesSummary Results by Unit Page 2 of 6
TABLE 6-16
IN-SITU HYDRAULIC CONDUCTIVITY RESULTS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
Measured Geometric
Mean Measured Geometric
Mean
Slug In Test 1 6.29E-04 1.78E+00
Slug Out Test 2 1.35E-03 3.82E+00
Slug In Test 1 7.42E-06 2.10E-02
Slug Out Test 2 5.85E-05 1.66E-01
Slug Out Test 1 1.33E-05 3.77E-02
Slug In Test 2 3.00E-05 8.50E-02
GWA-13S Slug Out Test 1 1.95E-05 --5.53E-02 --
GWA-20S Slug Out Test 1 8.56E-06 --2.43E-02 --
Slug In Test 1 1.39E-04 3.95E-01
Slug Out Test 2 1.94E-04 5.50E-01
Slug In Test 1 3.52E-05 9.98E-02
Slug Out Test 2 2.45E-04 6.94E-01
Slug In Test 1 1.68E-05 4.76E-02
Slug Out Test 2 1.63E-05 4.62E-02
MW-1S Slug Out Test 1 5.83E-03 --1.65E+01 --
MW-2S Slug Out Test 1 1.48E-02 --4.18E+01 --
Slug In Test 1 1.80E-05 5.10E-02
Slug Out Test 2 1.69E-05 4.79E-02
MW-3S Slug Out Test 1 1.68E-02 --4.76E+01 --
MW-4S Slug Out Test 1 2.64E-02 --7.49E+01 --
Mw-5S Slug Out Test 1 1.27E-03 --3.60E+00 --
MW-6S Slug Out Test 1 3.07E-03 --8.71E+00 --
MW-7S Slug Out Test 1 4.65E-03 --1.32E+01 --
2.79E-04 7.90E-01
2.64E-02 7.49E+01
7.42E-06 2.10E-02
Prepared by: WJW Checked by: LWD
Notes:
Slug tests were analyzed using the Bouwer-Rice mathmatical model, unless where indicated.
cm/sec - centimeter per second
ft/day - feet per day
-- No statistics necessary, when only one slug test analyzed
4.66E-01
Slug Test
Number
Hydraulic Conductivity
(cm/sec)
Hydraulic Conductivity
(ft/day)
1.64E-04GWA-22S
9.28E-05 2.63E-01GWA-23S
9.20E-04 2.61E+00GWA-10S
Saprolite (continued)
Well ID Slug
Test
2.00E-05 5.66E-02GWA-12S
GEOMETRIC MEAN
HIGHEST CONDUCTIVITY
LOWEST CONDUCTIVITY
2.08E-05 5.91E-02GWA-11S
GWA-14S
1.74E-05 4.94E-02MW-2S-A
1.65E-05 4.69E-02
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 6-16
In-Situ Hydraulic ConductivitiesSummary Results by Unit Page 3 of 6
TABLE 6-16
IN-SITU HYDRAULIC CONDUCTIVITY RESULTS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
Measured Geometric
Mean Measured Geometric
Mean
Slug In Test 1 1.29E-04 3.66E-01
Slug Out Test 2 1.29E-04 3.66E-01
Slug In Test 1 7.53E-04 2.13E+00
Slug Out Test 2 7.39E-04 2.09E+00
Slug In Test 1 1.79E-05 5.07E-02
Slug Out Test 2 2.17E-05 6.16E-02
Slug In Test 1 1.63E-05 4.63E-02
Slug Out Test 2 1.35E-04 3.83E-01
Slug In Test 1 6.44E-04 1.83E+00
Slug Out Test 2 1.55E-04 4.40E-01
AB-6D Slug In Test 1 1.35E-04 --3.84E-01 --
Slug In Test 1 1.84E-04 5.21E-01
Slug Out Test 2 1.67E-04 4.74E-01
Slug In Test 1 6.85E-04 1.94E+00
Slug Out Test 2 6.90E-04 1.95E+00
AS-2D Slug In Test 1 5.66E-05 --1.60E-01 --
BG-1D Slug In Test 1 5.95E-06 --1.69E-02 --
Slug In Test 1 4.17E-04 1.18E+00
Slug In Test 2 4.66E-04 1.32E+00
Slug Out Test 3 4.13E-04 1.17E+00
Slug In Test 1 1.69E-04 4.79E-01
Slug Out Test 2 1.24E-04 3.51E-01
Slug In Test 1 6.98E-06 1.98E-02
Slug Out Test 2 1.51E-06 4.28E-03
Slug In Test 1 2.43E-04 6.89E-01
Slug Out Test 1 1.11E-04 3.15E-01
Slug In Test 1 2.47E-03 6.99E+00
Slug Out Test 2 2.17E-03 6.15E+00
Slug In Test 1 1.80E-04 5.09E-01
Slug Out Test 2 1.33E-04 3.76E-01
Slug In Test 1 7.53E-05 2.13E-01
Slug Out Test 2 5.56E-05 1.58E-01
Slug In Test 1 1.85E-05 5.25E-02
Slug Out Test 2 6.52E-06 1.85E-02
Slug In Test 1 3.57E-04 1.01E+00
Slug Out Test 2 2.01E-04 5.70E-01
Slug In Test 1 1.59E-02 4.52E+01
Slug Out Test 2 1.86E-02 5.28E+01
Prepared by: WJW Checked by: LWD
6.87E-04 1.95E+00AB-8D
6.47E-05 1.83E-01GWA-5D
2.68E-04 7.59E-01GWA-7D
4.31E-04 1.22E+00BG-2D
1.54E-04 4.38E-01GWA-4D
1.10E-05 3.12E-02GWA-6D
5.59E-021.97E-05AB-3D
3.66E-01
7.46E-04 2.11E+00AB-2D
4.70E-05 1.33E-01
1.72E-02 4.89E+01GWA-8D
2.31E-03
1.75E-04 4.97E-01AB-7D
Hydraulic Conductivity
(ft/day)
AB-1D 1.29E-04
AB-4D
BG-5D 3.25E-06 9.20E-03
Deep Zone
1.45E-04 4.10E-01BG-4D
6.56E+00GWA-3D
1.64E-04 4.66E-01C-2D
3.16E-04 8.97E-01AB-5D
Well ID Slug
Test
Slug Test
Number
Hydraulic Conductivity
(cm/sec)
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 6-16
In-Situ Hydraulic ConductivitiesSummary Results by Unit Page 4 of 6
TABLE 6-16
IN-SITU HYDRAULIC CONDUCTIVITY RESULTS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
Measured Geometric
Mean Measured Geometric
Mean
Slug In Test 1 7.21E-04 2.04E+00
Slug Out Test 2 7.74E-04 2.19E+00
Slug In Test 1 1.28E-03 3.62E+00
Slug Out Test 2 1.28E-03 3.63E+00
Slug In Test 1 7.12E-05 2.02E-01
Slug Out Test 2 2.43E-05 6.89E-02
Slug In Test 1 2.24E-03 6.35E+00
Slug Out Test 2 1.69E-03 4.79E+00
Slug In Test 3 2.11E-03 5.98E+00
Slug Out Test 4 2.18E-03 6.18E+00
Slug In Test 1 5.10E-04 1.45E+00
Slug Out Test 2 5.71E-04 1.62E+00
Slug In Test 1 1.16E-05 3.29E-02
Slug Out Test 2 8.25E-06 2.34E-02
Slug In Test 1 1.90E-03 5.37E+00
Slug Out Test 2 1.97E-03 5.58E+00
Slug In Test 1 2.83E-04 8.02E-01
Slug Out Test 2 3.08E-04 8.72E-01
MW-1D Slug Out Test 1 4.80E-02 --1.36E+02 --
MW-2D Slug Out Test 1 3.51E-03 --9.96E+00 --
MW-3D Slug Out Test 1 1.15E-02 --3.25E+01 --
MW-4D Slug Out Test 1 1.52E-03 --4.31E+00 --
MW-5D Slug Out Test 1 2.80E-04 --7.93E-01 --
MW-6D Slug Out Test 1 1.51E-02 --4.27E+01 --
MW-7D Slug Out Test 1 1.51E-03 --4.28E+00 --
Slug In Test 1 1.10E-04 3.13E-01
Slug Out Test 2 1.56E-04 4.42E-01
Slug In Test 1 7.33E-04 2.08E+00
Slug Out Test 2 8.11E-04 2.30E+00
3.03E-04 8.58E-01
4.80E-02 1.36E+02
1.51E-06 4.28E-03
Prepared by: WJW Checked by: LWD
Notes:
Slug tests were analyzed using the Bouwer-Rice mathmatical model, unless where indicated.
cm/sec - centimeter per second
ft/day - feet per day
-- No statistics necessary, when only one slug test analyzed
Deep Zone (continued)
Well ID Slug
Test
Slug Test
Number
Hydraulic Conductivity
(cm/sec)
Hydraulic Conductivity
(ft/day)
2.95E-04 8.37E-01GWA-23D
9.78E-06 2.77E-02GWA-20D
1.31E-04 3.72E-01MW-9D
7.71E-04 2.19E+00MW-15D
1.93E-03 5.48E+00GWA-22D
1.28E-03 3.63E+00GWA-10D
7.47E-04 2.12E+00GWA-9D
LOWEST CONDUCTIVITY
HIGHEST CONDUCTIVITY
GEOMETRIC MEAN
5.40E-04 1.53E+00
2.04E-03 5.79E+00GWA-12D
4.16E-05 1.18E-01GWA-11D
GWA-14D
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 6-16
In-Situ Hydraulic ConductivitiesSummary Results by Unit Page 5 of 6
TABLE 6-16
IN-SITU HYDRAULIC CONDUCTIVITY RESULTS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
Measured Geometric
Mean Measured Geometric
Mean
AB-3BR Slug Out Test 1 6.14E-06 --1.74E-02 --
BG-2BR Slug Out Test 1 2.87E-06 --8.14E-03 --
BG-4BR Slug Out Test 1 3.74E-07 --1.06E-03 --
Slug In Test 1 1.84E-05 5.22E-02
Slug Out Test 2 2.00E-05 5.67E-02
Slug In Test 1 7.86E-07 2.23E-03
Slug Out Test 2 5.39E-07 1.53E-03
Slug In Test 1 1.42E-04 4.03E-01
Slug Out Test 2 1.60E-04 4.54E-01
Slug In Test 1 2.08E-04 5.90E-01
Slug Out Test 2 2.18E-04 6.19E-01
GWA-4BR Slug In Test 1 3.01E-06 --8.53E-03 --
Slug In Test 1 1.16E-04 3.29E-01
Slug Out Test 2 1.06E-04 3.00E-01
Slug In Test 1 2.03E-05 5.76E-02
Slug Out Test 2 1.19E-05 3.37E-02
Slug In Test 1 1.52E-04 4.29E-01
Slug Out Test 2 1.67E-04 4.72E-01
Slug In Test 1 9.70E-06 2.75E-02
Slug Out Test 2 4.82E-05 1.37E-01
MW-7BR Slug Out Test 1 1.68E-05 --4.75E-02 --
Slug In Test 1 4.99E-04 1.42E+00
Slug Out Test 2 3.72E-04 1.06E+00
2.60E-05 7.37E-02
4.99E-04 1.42E+00
3.74E-07 1.06E-03
Prepared by: WJW Checked by: LWD
Notes:
Slug tests were analyzed using the Bouwer-Rice mathmatical model, unless where indicated.
cm/sec - centimeter per second
ft/day - feet per day
-- No statistics necessary, when only one slug test analyzed
LOWEST CONDUCTIVITY
4.31E-04
GEOMETRIC MEAN
HIGHEST CONDUCTIVITY
Hydraulic Conductivity
(cm/sec)
Well ID Slug
Test
Slug Test
Number
MW-9BR
1.55E-05GWA-20BR
1.59E-04
Bedrock
2.13E-04 6.04E-01GWA-2BR
1.11E-04 3.14E-01GWA-7BR
1.22E+00
1.92E-05 5.44E-02BG-5BR
4.50E-01GWA-22BR-A
6.13E-022.16E-05GWA-23BR
1.51E-04 4.28E-01GWA-1BRU
Hydraulic Conductivity
(ft/day)
6.50E-07 1.84E-03C-1BRU
4.41E-02
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 6-16
In-Situ Hydraulic ConductivitiesSummary Results by Unit Page 6 of 6
Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin,
August 18, 2015
Table 6-17. Laboratory Permeability Test Results
Borehole Category of Test Depth 1 of Test
(ft bgs)
Depth 2 of Test
(ft bgs)
Vertical
Hydraulic
Conductivity 'k'
(cm/sec)
Hydrostratigraphic
Layer
AB-1D Laboratory Conductivity 75.0 77.0 8.2E-07 M1
AB-1S Laboratory Conductivity 61.0 63.0 8.1E-07 F
AB-2D Laboratory Conductivity 83.0 85.0 5.0E-05 M1
AB-2S Laboratory Conductivity 30.0 32.0 1.1E-05 F
AB-4S Laboratory Conductivity 18.0 20.0 5.8E-05 F/A
AB-5SL Laboratory Conductivity 59.0 61.0 9.3E-07 M1
AB-6BRU Laboratory Conductivity 93.0 95.0 1.6E-06 M1
AB-6S Laboratory Conductivity 23.0 24.2 1.0E-04 F
AB-7S Laboratory Conductivity 25.0 27.0 4.8E-05 M1
AB-8S Laboratory Conductivity 2.2 4.5 9.1E-05 M1
AB-8S Laboratory Conductivity 28.0 30.0 3.3E-06 M1
AB-8S Laboratory Conductivity 43.0 45.0 2.0E-05 M2
AS-1S Laboratory Conductivity 40.0 42.0 1.3E-04 A
AS-2S Laboratory Conductivity 8.0 10.0 2.2E-05 A
AS-2S Laboratory Conductivity 53.0 55.0 1.0E-06 M1
AS-2S Laboratory Conductivity 88.0 90.0 7.4E-05 M1
AS-3S Laboratory Conductivity 25.0 27.0 1.8E-05 A
BG-1S Laboratory Conductivity 10.0 12.3 7.4E-06 M1
BG-1S Laboratory Conductivity 35.0 37.3 6.9E-05 M1
C-2S Laboratory Conductivity 35.0 37.0 2.4E-04 M1
GWA-10S Laboratory Conductivity 21.0 23.0 3.9E-06 M1
GWA-1S Laboratory Conductivity 47.0 47.5 1.9E-05 M1
GWA-3S Laboratory Conductivity 24.0 25.0 2.5E-06 M2
GWA-6S Laboratory Conductivity 13.5 15.5 4.1E-06 M1
GWA-6S Laboratory Conductivity 33.5 35.5 9.9E-05 M1
GWA-7S Laboratory Conductivity 20.0 22.0 4.0E-06 M1
GWA-8S Laboratory Conductivity 20.0 22.0 3.0E-05 M1
GWA-9BRA Laboratory Conductivity 14.0 16.0 7.1E-07 M1
MW-9BR Laboratory Conductivity 10.0 12.0 9.5E-08 M1
MW-9BR Laboratory Conductivity 18.0 20.0 7.3E-08 M1
MW-9BR Laboratory Conductivity 55.0 56.0 1.6E-05 M2
Notes:
1. Vertical hydraulic conductivity values from laboratory testing in accordance with ASTM Standard D 5084
2. Laboratory conductivity results in which test interval bridges hydrostratigraphic layers were not used in the
statistical analysis.
3. AB-6BRU represented as AB-6D on geotechnical lab reports due to re-name event after sample submission
4. GWA-9BRA represented as GWA-9D on lab reports due to re-name event after sample submission

Source: HDR, Comprehensive Site Assessment Report Riverbend Steam Station Ash Basin,
August 18, 2015
Table 6-18. Historic Laboratory Permeability Test Result
Borehole Category of Test Depth 1 of
Test (ft bgs)
Depth 2 of
Test (ft bgs)
Vertical
Hydraulic
Conductivity
'k' (cm/sec)
Hydrostratigraphic
Layer
B-202 Historic Laboratory 66.3 66.8 6.90E-06 M1
Note:
1. See Appendix H for referenced historic laboratory permeability report.
Reference:
1. Phase 2 Reconstitution of Design of Ash Pond Designs Work Plan for Riverbend Steam Station. Developed by
URS, dated September 26, 2014. URS Project No. 31829861
TABLE 7-1
SOIL, SEDIMENT, AND ASH ANALYTICAL METHODS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
INORGANIC COMPOUNDS UNITS METHOD
Aluminum mg/kg EPA 6010D
Antimony mg/kg EPA 6020B
Arsenic mg/kg EPA 6020A
Barium mg/kg EPA 6010C
Beryllium mg/kg EPA 6020B
Boron mg/kg EPA 6010C
Cadmium mg/kg EPA 6020A
Calcium mg/kg EPA 6010C
Chloride mg/kg EPA 9056A
Chromium mg/kg EPA 6010C
Cobalt mg/kg EPA 6020A
Copper mg/kg EPA 6010C
Iron mg/kg EPA 6010C
Lead mg/kg EPA 6020A
Magnesium mg/kg EPA 6010C
Manganese mg/kg EPA 6010C
Mercury mg/kg EPA Method 7471B
Molybdenum mg/kg EPA 6010C
Nickel mg/kg EPA 6010C
Nitrate as Nitrogen mg/kg EPA 9056A
pH SU EPA 9045D
Potassium mg/kg EPA 6010C
Selenium mg/kg EPA 6020A
Sodium mg/kg EPA 6010C
Strontium mg/kg EPA 6010C
Sulfate mg/kg EPA 9056A
Thallium (low level) (SPLP Extract only)mg/kg EPA 6020A
Total Organic Carbon mg/kg EPA 9060
Vanadium mg/kg EPA 6020A
Zinc mg/kg EPA 6010C
Sediment Specific Samples
Cation exchange capacity meg/100g LDNR 29-B
Particle size distribution %
Percent solids %
Percent organic matter % EPA/600/R-02/069
Redox potential mV
Faulkner et al. 1898;
HACH Method 10228
Notes:
1. Soil samples to be analyzed for Total Inorganics using USEPA Methods 6010/6020 and pH using USEPA Method 9045, as noted above.
meq/100g - millequivalents per 100 grams
mg/kg - Milligrams per kilogram
mV - Millivolts
S.U. - Standard Unit
Prepared by: RBI Checked by: SRW/TCP
2. Ash samples to be analyzed for Total Inorganics using USEPA Methods 6010/6020 and pH using USEPA Method 9045; select ash
samples will also be analyzed for leaching potential using SPLP Extraction Method 1312 in conjunction with USEPA Methods 6010/6020.
3. Analytical methods and reporting limits as presented were applicable at time of CSA field implementation in 2015. Analytical methods
and reporting limits are updated periodically and applied as appropriate.
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 7-1 Soil, Sediment and Ash Analytical Methods Page 1 of 1
TABLE 7-2
PROVISIONAL BACKGROUND THRESHOLD VALUES FOR SOIL
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\
Table 7-2 - Provisional Background Threshold Values for Soil Page 1 of 1
Parameter Reporting Unit PSRG Protection
of Groundwater BTV
pH*S.U.NE 4.3 - 6.7
Aluminum mg/kg NE 31,151
Antimony mg/kg 0.9 0.6
Arsenic mg/kg 5.8 3.8
Barium mg/kg 580 190
Beryllium mg/kg 63 1.36
Boron mg/kg 45 15.7
Cadmium mg/kg 3 0.03
Calcium mg/kg NE 410
Chloride mg/kg NE 12
Chromium mg/kg 3.8 20
Cobalt mg/kg 0.9 58.6
Copper mg/kg 700 33.1
Iron mg/kg 150 40,150
Lead mg/kg 270 11.3
Magnesium mg/kg NE 760
Manganese mg/kg 65 1,867
Mercury mg/kg 1 0.099
Molybdenum mg/kg NE 1.83
Nickel mg/kg 130 10.2
Nitrate (as N)mg/kg NE 0.25
Potassium mg/kg NE 2,440
Selenium mg/kg 2.1 1.58
Sodium mg/kg NE 427
Strontium mg/kg NE 18.3
Sulfate mg/kg NE 12
Thallium mg/kg 0.28 0.166
Vanadium mg/kg 6 113
Zinc mg/kg 1200 60.5
Notes:
- Updated value based upon ongoing statistical evaluation since September 1, 2017 (Zimmerman to Draovitch; Appendix A
* - Upper and lower threshold values calculated for parameter
BTV - Background Threshold Value
mg/kg - milligrams per kilogram
NE - Not Established
Prepared by: JHG Checked by: MCM
TABLE 7-3
BACKGROUND SOIL DATA SUMMARY
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 7-3 Background Soil Data Summary Page 1 of 1
pH Aluminum Antimony Arsenic Barium Beryllium Boron Cadmium Calcium Chloride Chromium Cobalt Copper Iron Lead Magnesium Manganese Mercury Molybdenum Nickel Nitrate
(as N)Potassium Selenium Sodium Strontium Sulfate Thallium Vanadium Zinc
NE NE 0.9 5.8 580 63 45 3 NE NE 3.8 0.9 700 150 270 NE 65 1 NE 130 NE NE 2.1 NE NE NE 0.28 6 1200
S.U.mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg
Sample ID Sample
Collection Date
BG-1D (5-6)6/3/2015 4.6 j 12100 ------20.4 <0.32 <16.2 <0.78 <162 <321 9 ---11.6 32200 13.7 <162 29.1 0.048 <3.2 1.3 j ---<325 ---<325 <3.2 <321 ---89.2 <6.5
BG-1D (14-15)6/3/2015 5.6 j 11600 ------77.3 <0.41 <20.7 <0.99 <207 <427 5.5 5 j 15.1 26800 4.9 j 2750 226 0.0095 j <4.1 3.4 ---2580 ---<414 <4.1 <427 ---70.2 12.5
BG-1D (24-25)6/3/2015 5 j 14100 ------175 0.25 j <20.5 <0.98 <205 <394 5.4 22.8 25.2 28200 6 j 7340 1140 <0.013 <4.1 6.4 ---6500 ---<410 <4.1 <394 ---75.8 34.7
BG-3D (3-5)6/13/2015 4.8 j 23100 ------28.4 0.33 <15.7 <0.75 <157 <313 17.4 ---11.4 34100 18.1 526 114 0.027 j+<3.1 6.7 <31.3 586 ---<314 1.7 j <313 ---67.5 24.6
BG-3D (18.5-20)6/13/2015 6 j 26000 ------240 0.66 <15.4 <0.74 1150 <309 14.4 14.6 16.4 23800 4.2 j 8030 943 <0.01 <3.1 8.3 <30.9 6450 ---<307 10.4 <309 ---62.3 43
BG-3D (23-24)6/13/2015 5.8 j 26700 ------276 0.84 <15.6 <0.75 1420 ---6.1 11 10.4 18100 3.7 j 7660 626 <0.01 <3.1 7.6 <31.8 6410 ---<311 16.2 ------45.4 45.8
GWA-5D (58.5-60)4/10/2015 5.2 j 3340 ------28.7 0.22 j <17.2 <0.83 <172 <341 3.2 13.5 7.1 18600 4.5 j <172 477 <0.011 <3.4 <1.7 ---<344 ---<344 <3.4 <341 ---33.6 6.8 j
GWA-6D-1 (43.5-45)3/4/2015 5.4 j 2380 ---3.4 75.5 0.29 j 14.9 <0.41 34.1 <353 7.3 j+25.4 23.2 19000 4.6 92.1 j+1270 <0.01 <0.68 4.2 j+---105 j+---<68.1 <0.68 <353 ---55.8 3.6 j+
GWA-6D-2 (48.5-50)3/4/2015 5.5 j 13200 ---4.4 176 0.3 j 16.2 <0.53 4250 <446 j 1.2 j+10.5 28.1 18200 2.6 j 8830 523 <0.01 <0.89 2.4 j+---8320 ---156 j+21.8 <446 ---55.5 56.7 j+
GWA-21D (3.5-5)7/15/2015 5 j 37400 ---12.2 37.7 0.41 j <21.4 <1 379 <402 62.4 ---7.6 64000 20.9 232 153 0.54 <4.3 j 3.5 40.2 j 275 j ---<427 7.1 <402 ------17.3
GWA-21D (8.5-10)7/16/2015 5 j 5430 j+---3.6 j 2.5 j+<0.3 <14.8 j <0.71 ------17.7 j+---5.2 j+38300 3.2 j ---92.7 0.0077 j <3 j <1.5 j 29.4 j ---------<3 j ---------<5.9 j
GWA-21D (18.5-20)7/16/2015 5 j 4250 ------3.7 j 0.44 <18.4 <0.88 <184 j <369 16.9 j+5.3 j 7.9 j+26600 <7.4 j <184 j 68.4 0.0098 j <3.7 j 10.2 36.9 j <368 j ---<368 j <3.7 j <369 ------35.5 j+
GWA-21D (48.5-50)7/18/2015 5.2 j 2070 ------113 0.24 j <15.7j <0.75 ------3.2 4.5 j 16 14300 <6.3 ---592 <0.01 j <3.1 j 2.9 30.2 j ---------<3.1 ---------20.2
MW-7BR (43.5-45)4/24/2015 5.4 j 5650 j ------31.3 <0.32 12 j <0.77 <160 <323 3.6 7.3 j 4.5 12300 j 3.7 j+620 446 j <0.01 <3.2 j 2.4 ---216 j+---<321 <3.2 <323 ---29.2 6.6
OB-2 (38.5-40.0)4/14/2015 5.5 j 14400 ------157 1.2 26.7 <1.1 155 j <488 2.7 36.1 76.4 41000 <9.5 4330 1950 <0.015 <4.7 11.4 ---2440 ---<474 3 j <488 ---130 60.8
BGSB-04 (4-5)07/27/2017 4.5 22000 <0.51 9.4 13 0.34 <5.9 <0.025 <290 <12 43 1.1 13 36000 15 220 j 57 <0.088 1.4 j 6.3 <0.24 310 1.2 j <290 5.5 <12 0.22 110 23
BGSB-04 (9-10)07/27/2017 4.3 22000 <0.58 3.6 14 0.31 2 j <0.029 <230 <12 18 0.95 9.6 16000 8.4 170 j 43 <0.083 0.82 j 2.9 <0.23 320 0.56 j <230 2.4 <12 0.13 j 51 15
BGSB-04 (14-15)07/27/2017 4.7 19000 <0.59 1.5 5.8 0.19 2.3 j <0.03 <280 <12 12 0.93 4 21000 5 100 j 27 <0.09 <2.2 <2.2 0.072 j 130 j <1.5 <280 0.6 j <12 0.044 j 51 5.9
BGSB-05 (4-5)07/27/2017 6.3 23000 <0.49 3.2 50 0.42 <5.2 0.016 j 530 <12 24 8.6 24 27000 9.6 960 390 <0.1 0.68 j 7.3 <0.25 600 0.95 j <520 11 <12 0.23 88 24
BGSB-05 (9-10)07/27/2017 6.3 17000 <0.47 3.8 35 0.24 2.4 j <0.024 410 1.2 j 15 2.1 8 13000 9.2 440 110 <0.09 0.68 j 3.6 0.075 j 480 0.81 j <290 9.7 <12 0.2 37 14
BGSB-05 (14-15)07/27/2017 5.8 25000 <0.59 3.5 14 0.26 2.3 j <0.029 77 j <12 18 1.3 7.9 16000 13 260 j 45 <0.086 1 j 3 <0.23 360 0.65 j <280 5.3 <12 0.14 j 39 13
BGSB-06 (4-5)07/28/2017 4.6 18000 0.15 j,M 1.5 12 0.37 <1.6 0.015 j 240 2.8 j 13 2.2 18 18000 4.9 490 23 0.032 j <1.3 3 0.64 200 0.41 j <160 4.7 <12 0.058 j 51 M 7.8
BGSB-06 (9-10)07/28/2017 4.5 13000 <0.62 0.49 j 33 0.46 <2 0.023 j <200 1.9 j 12 5.8 16 15000 1.6 320 150 0.05 j 0.54 j 3.1 0.084 j 230 0.41 j <200 0.4 j <13 0.068 j 40 5.3
BGSB-06 (14-15)07/28/2017 4.4 17000 <0.56 1.4 240 1.5 1 j 0.032 <230 2.5 j 7.9 33 44 20000 2.1 320 2800 <0.099 <1.9 7.2 0.085 j 290 0.75 j <230 0.44 j <13 0.058 j 110 9
BGSB-07 (4-5)07/27/2017 4.6 20000 0.13 j,M 3.8 15 0.36 2.3 j <0.03 <240 <12 16 1.4 12 21000 M 18 M 240 43 <0.099 M 1.8 j 1.1 j 0.07 j 310 0.95 j <240 2.2 <12 0.21 86 8.8
BGSB-07 (9-10)07/27/2017 4.7 8400 <0.52 1.2 7.9 0.19 1.4 j <0.026 <280 <12 20 0.42 j 7.5 11000 5.5 120 j 14 <0.093 1 j <2.2 <0.24 240 j 0.53 j <280 1 j <12 0.089 j 59 3.4
BGSB-07 (14-15)07/27/2017 4.7 11000 <0.6 0.89 8 0.17 1.5 j <0.03 <270 <13 25 0.4 j 7 9500 3.7 190 j 6.9 <0.098 0.7 j <2.2 <0.25 240 j <1.6 36 j <1.2 <13 0.061 j 53 3
BGSB-08 (4-5)07/27/2017 4.9 9900 <0.49 0.75 22 0.64 <3.7 0.026 <240 <11 2.9 10 61 30000 1.6 160 j 260 <0.09 <1.9 2 j <0.23 210 j 0.65 j <240 1.4 <11 0.091 j 67 18
BGSB-08 (9-10)07/27/2017 4.8 18000 0.27 j 0.46 j 34 1 2.2 j 0.021 j <250 <12 3.4 31 52 21000 3.6 220 j 880 <0.098 <2 2.2 <0.24 91 j 0.4 j <250 3.4 <12 0.062 j 71 15
BGSB-08 (14-15)07/27/2017 4.9 17000 <0.56 0.94 28 0.92 2 j 0.017 j <240 <12 2.5 53 50 30000 7.8 450 1300 <0.089 <1.9 1.7 j <0.25 230 j 1.2 j <240 <1.1 <12 0.11 j 100 17
BGSB-09 (4-5)07/27/2017 6.3 21000 <0.54 0.84 82 0.79 1.3 j <0.027 2300 <12 110 18 23 18000 1.6 9400 310 <0.093 0.44 j 42 0.087 j 1300 0.83 j 190 j 34 <12 0.048 j 53 32
BGSB-09 (9-10)07/27/2017 6.7 59000 <0.56 2 110 0.54 1.8 j <0.028 710 6 j 14 6.6 12 23000 5.2 2000 120 <0.11 1.1 j 6.4 3.1 1200 1.2 j <1500 11 15 0.1 j 59 30
BGSB-09 (14-15)07/27/2017 6.37 44000 0.28 j 0.53 j 190 0.54 1.2 j <0.027 410 4.5 j 4.1 19 6.8 13000 1.9 5000 300 <0.094 0.81 j 5.7 0.36 M 2700 1.3 j 110 j 11 <12 0.052 j 33 41
Notes:
--- - Not applicable; non-detect concentration greater than PSRG Protection of Groundwater; value omitted
- Indicates data removed/identified as an outlier
< - Less than
j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
j- - Estimated concentration, biased low.
j+ - Estimated concentration, biased high.
M - Matrix spike / matrix spike duplicate failure.
mg/kg - milligrams per kilogram
NE - Not established
PSRG Protection of Groundwater - NCDEQ IHSB Preliminary Soil Remediation Soil Remediation Goals Table – October 2016
S.U. - Standard Units
Analytical Results
Prepared by: JHG Checked by: BDR
Reporting Units
PSRG Protection of Groundwater
Analytical Parameter
TABLE 7-4
POTENTIAL SECONDARY SOURCE SOIL ANALYTICAL RESULTS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 7-4 Potential Secondary Source Soil Analytical Results Page 1 of 2
Reporting Units S.U.mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg
PSRG Protection of Groundwater NE 0.9 5.8 45 3.8 0.9 150 65 NE NE 6
Provisional Background Threshold Values 4.3-6.7 0.6 3.8 20.7 20 58.6 40150 1867 18.3 12 113
Sample ID Water Level (ft
bgs)
Saurated/
Unsaturated pH Antimony Arsenic Boron Chromium Cobalt Iron Manganese Strontium Sulfate Vanadium
AB-01D (8.5-10)57.7 Unsaturated 5.4 j <7.4 <7.4 <18.8 44.4 18 40600 652 2.9 j <364 86.4
AB-01D (28.5-30)57.7 Unsaturated 4.7 j <6.9 <6.9 11.8 j 35.8 32.7 71900 563 <3.4 <336 92.6
AB-01D (63.5-65)57.7 Saturated 5.2 j <6.1 <6.1 <15.3 33.8 6.1 j 31700 20.2 <3.1 <316 77.3
AB-01D (75-78)57.7 Saturated NA NA NA NA NA NA NA NA NA NA NA
AB-01D (78.5-80)57.7 Saturated NA NA NA NA NA NA NA NA NA NA NA
AB-02D (8.5-10)49.1 Unsaturated 4.9 j <7 <7 <17.5 16 8.6 31100 171 <3.5 <342 91.9
AB-02D (28.5-30)49.1 Unsaturated 4.7 j 9.5 j <9.5 <23.7 24.7 j-7 j-43200 j-101 j-<4.7 <473 161 j+
AB-02D (68.5-70)49.1 Saturated 4.7 j <6.4 <12.9 10.9 j 55.3 35.1 70000 522 <3.2 <333 150
AB-02D (83.5-85)49.1 Saturated NA NA NA NA NA NA NA NA NA NA NA
AB-03D (3.5-5)36.1 Unsaturated 4.2 j 6.1 j <6.1 <15.3 2.5 <6.1 7620 j 41.4 j+<3.1 <313 18.1
AB-03D (68.5-70)36.1 Saturated 7.7 j <6.3 26.5 24.4 19.2 4.1 j 17900 55.1 118 <312 47.9
AB-04D (3.5-5)34.4 Unsaturated 5.3 j <5.6 <5.6 15.8 19.2 <5.6 17800 51.2 <2.8 <289 36.4
AB-04D (43.5-45)34.4 Saturated 6.5 j <8.2 20.9 <20.5 4.8 <8.2 3390 19.7 62.8 <389 9.9
AB-04D (48.5-50)34.4 Saturated 4.8 j <7.1 <7.1 36.6 27.3 36.1 42400 485 10.9 200 j 58.1
AB-04D (58.5-61.5)34.4 Saturated 5.9 j <6.5 <6.5 16.7 26.3 63.6 19000 3320 19.5 <318 40.4
AB-04S (53.5-55)30.2 Saturated 5.2 j <7.6 <7.6 <19.1 33.4 75 41300 1950 20.7 <386 81.6
AB-05D (63.5-65)48.6 Saturated 4.8 j <7.1 3.7 j <17.7 6.1 6 j 37100 108 29 222 j 141
AB-06D (8.5-10)69.1 Unsaturated NA <7.1 4.4 j 35.8 44.6 <7.1 43300 43.1 <3.6 <344 99.6
AB-06D (28.5-30)69.1 Unsaturated 4.5 j <7.6 <7.6 54.3 36.5 8.1 58300 507 <3.8 <375 149
AB-06D (73.5-75)69.1 Saturated 4.4 j <6.5 <6.5 27 26.8 <6.5 28700 68.9 <3.3 181 j 77.9
AB-07D (23.5-25)16.6 Saturated 5.2 j <3 1.6 j <3 16.8 <3 7830 6.8 j+1.7 <305 58.2
AB-07D (28.5-30)16.6 Saturated 5.2 j <3.6 24.6 2 j 27.6 4.7 21200 119 59.9 <348 56.3
AB-07S (18.5-20)13.9 Saturated 6.3 j <4 35.1 30.5 17.2 8.3 16400 158 174 <411 66.9
AB-07S (20-25)13.9 Saturated NA NA NA NA NA NA NA NA NA NA NA
AB-08D (90-90.5)22.7 Saturated 8.3 j <5 <5 <12.5 3 3 j 5590 130 4.9 256 j 11.4
AB-08S (13-15)24.1 Unsaturated 5.6 j 4.6 j 9.2 j 51.7 186 48.4 57500 1080 6.7 <477 140
AB-08S (20-25)24.1 Partially Saturated 5.6 j <4.2 <8.4 50 177 70.1 50200 1660 16.3 <426 145
AB-08S (30-35)24.1 Saturated NA NA NA NA NA NA NA NA NA NA NA
AS-01D (83.5-85.5)90.0 Unsaturated 5.3 j <3.4 2.4 j 13.5 7.6 j+5.1 14400 170 8.9 <344 35.4
AS-01D (88.5-90.5)90.0 Partially Saturated 5.7 j <3.5 <3.5 6.7 3.4 j+5.2 7540 194 10 <335 17.2
AS-02D (23.5-25)79.6 Unsaturated 4.5 j <3.4 <3.4 15 4.2 j+5.9 12200 313 1.6 j+214 j 33.8
AS-02D (28.5-30)79.6 Unsaturated 4.3 j <3 <3 16 4.8 j+6.1 12900 276 1.4 j+<302 37.3
AS-02D (30-31.5)79.6 Unsaturated 5.1 j <3.1 10.9 14.9 9.7 j+3.7 14300 85 27.7 173 j 44.4
AS-02S (23.5-25)81.1 Unsaturated NA NA NA NA NA NA NA NA NA NA NA
AS-02S (28.5-30)81.1 Unsaturated NA NA NA NA NA NA NA NA NA NA NA
AS-02S (50-53)81.1 Unsaturated NA NA NA NA NA NA NA NA NA NA NA
AS-02S (90-90)81.1 Saturated NA NA NA NA NA NA NA NA NA NA NA
AS-03D (53.5-55)66.2 Unsaturated 7.7 j <3.1 8.6 15.4 9.1 5.2 16600 127 44.8 <305 46
AS-03D (58.5-60)66.2 Unsaturated 5.4 j <3.3 <3.3 8.1 3.1 8.3 11100 793 0.43 j+<327 21
BG-02D (3.5-5)52.6 Unsaturated 6.1 j <6.1 5.5 j <15.3 33 <6.1 36500 11.4 3.9 175 j-89.2
BG-02D (48-49)52.6 Unsaturated 4.5 j <6.3 <6.3 <15.8 6 14.6 17100 290 7.2 <314 43.9
BG-02D (53-54)52.6 Saturated 4.7 j <7.6 <7.6 <19 4.5 8.5 16000 689 8 <365 40.8
BG-02D (60-62)52.6 Saturated 4.8 j <7.8 <7.8 <19.6 20.6 13.8 20600 1440 16.7 <379 58.8
BG-02D (74-75)52.6 Saturated 5.5 j <6.3 <6.3 <15.8 5.5 9.2 14600 975 14.9 <296 37.9
BG-02D (159-160)52.6 Saturated 8.2 j <5.2 <5.2 <13 6.8 10.4 18800 754 15.8 <265 30.4
C-01D (13.5-15)18.8 Unsaturated 4 j <3 <3 <3 9.3 <3 6380 24.1 6.2 175 j 15.2
C-01D (23.5-25)18.8 Saturated 4.3 j <2.9 <2.9 <2.9 6.2 6 11500 242 11.5 <275 23.3
C-02D (18.5-20)27.7 Unsaturated 3.8 j <3.7 3.7 j <3.7 9.9 3.1 j 39000 20.5 3.3 219 j 38.1
C-02D (23.5-25)27.7 Unsaturated 3.8 j <2.9 <2.9 <2.9 6.4 14 12800 237 1.2 <297 40.1
C-02S (30-35)24.2 Saturated NA NA NA NA NA NA NA NA NA NA NA
GWA-01BRU (28.5-30)36.1 Unsaturated 5.2 j <7.6 <7.6 <18.9 92.8 34.8 31700 1090 5.7 <359 88.2
GWA-01BRU (33.5-35)36.1 Unsaturated 6.2 j <8.5 <8.5 <21.2 110 38.9 55200 2940 14.5 <430 133
GWA-01BRU (66-66.3)36.1 Saturated 9.1 j <5 <5 <12.4 3.3 3.5 j 6380 444 2.8 <251 16.4
GWA-01S (42-47)36.1 Saturated NA NA NA NA NA NA NA NA NA NA NA
GWA-02BR (80-81.5)41.6 Saturated 8.5 j <4.8 <4.8 <11.9 9.2 16.7 17200 2660 19.4 249 j 83.4
GWA-02BRU (30-31.5)41.8 Unsaturated 5.8 j <7.8 <7.8 26.1 1.3 j 18.8 39700 1560 33.2 <382 128
GWA-02BRU (38.5-40)41.8 Unsaturated 6.3 j <7 <7 16.2 j 1.5 j 15 24100 713 32.8 <362 89.4
GWA-02BRU (43.5-45)41.8 Saturated 6.4 j <5.8 <5.8 21.3 3.6 12.6 32300 1120 35.1 <277 126
GWA-02S (48-52)45.7 Saturated NA NA NA NA NA NA NA NA NA NA NA
GWA-03D (18.5-19)28.1 Unsaturated 7.2 j <5.8 <5.8 <14.5 4.5 <5.8 5320 155 4.4 271 j 11.5
TABLE 7-4
POTENTIAL SECONDARY SOURCE SOIL ANALYTICAL RESULTS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 7-4 Potential Secondary Source Soil Analytical Results Page 2 of 2
Reporting Units S.U.mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg
PSRG Protection of Groundwater NE 0.9 5.8 45 3.8 0.9 150 65 NE NE 6
Provisional Background Threshold Values 4.3-6.7 0.6 3.8 20.7 20 58.6 40150 1867 18.3 12 113
Sample ID Water Level (ft
bgs)
Saurated/
Unsaturated pH Antimony Arsenic Boron Chromium Cobalt Iron Manganese Strontium Sulfate Vanadium
GWA-03D (40-40.5)28.1 Saturated 7.5 j <5.2 <5.2 <13.1 1.2 j <5.2 1540 83.8 2.6 j 257 j <5.2
GWA-04S (15-19)21.8 Unsaturated 3.9 j <8 <8 <39.8 58 25.5 38700 367 42.9 506 j-62.9
GWA-04S (24-26)21.8 Saturated 3.8 j <6.8 <6.8 <17.1 5.1 5.8 j 10200 269 9.2 <332 19.2
GWA-04S (32-35)21.8 Saturated NA <8.2 <8.2 <20.6 5.5 4.4 j 8190 168 8 <397 17.3
GWA-04S (34-36)21.8 Saturated 5.9 j <6 <6 <15.1 2.6 3.1 j 4950 231 7.3 <300 5.6 j
GWA-07D (13.5-15)15.0 Unsaturated 6.5 j <7.1 <7.1 <17.7 13 34.7 23200 813 26.5 <330 73.8
GWA-07D (23.5-25)15.0 Saturated 6.7 j <6.9 <6.9 <17.4 15.8 20.1 19000 296 25 <347 59.2
GWA-07S (7-8)13.4 Unsaturated 6 j <6.7 <6.7 <16.7 53.4 73.8 58900 1700 6.6 <326 209
GWA-07S (22-23)13.4 Saturated NA NA NA NA NA NA NA NA NA NA NA
GWA-08D (8.5-10)20.7 Unsaturated 5 j <6.6 <6.6 <82.7 131 87 54200 959 1.9 j <325 80.1
GWA-08D (18.5-20)20.7 Unsaturated 5.4 j <7.2 <7.2 <18 135 102 36400 1410 7.4 <345 33.5
GWA-08D (19-20)20.7 Unsaturated NA NA NA NA NA NA NA NA NA NA NA
GWA-09BR (14-17)100.5 Unsaturated NA NA NA NA NA NA NA NA NA NA NA
GWA-09D (3.5-5)0.7 Saturated 4.9 j <6.5 3.5 j <16.3 210 19.8 109000 937 5.3 <330 148
GWA-09D (50.5-51)0.7 Saturated 6.4 j <6.1 <6.1 <15.1 36 14.5 20700 373 25.4 <304 61.8
GWA-10S (8-9)11.1 Unsaturated 4.1 j <7.1 <7.1 <17.8 12.3 24.4 30100 1840 2.4 j <342 59.3
GWA-10S (13-14)11.1 Saturated 4.1 j <7.5 <7.5 <18.6 11.1 20.7 25400 893 5 <356 69
GWA-10S (21-23)11.1 Saturated NA NA NA NA NA NA NA NA NA NA NA
GWA-20D (40-41.5)48.3 Unsaturated 4.8 j <6.4 <6.4 <16 4.4 <6.4 9880 131 <3.2 <325 19
GWA-20D (45-46.5)48.3 Unsaturated 4.8 j <6.5 <6.5 <16.3 7.4 5 j 16300 184 <3.3 <321 31.1
GWA-22D (38.5-40)57.8 Unsaturated 5.1 j <7.7 <7.7 <19.2 4 <7.7 7160 77.7 <3.8 <369 7 j
GWA-22D (48.5-50)57.8 Unsaturated 4.9 j <6.8 <6.8 <17 2.1 3.9 j 6990 113 2 j <346 9.3
GWA-23D (33.5-35)45.6 Unsaturated 4.6 j <6.5 <6.5 <16.3 1.6 j 6.9 5230 336 <3.3 338 j 9.9
GWA-23D (38.5-40)45.6 Unsaturated 4.7 j <6.7 <6.7 <16.8 2.2 18.6 7710 210 <3.4 332 j 14.2
MW-09BR (10-12)0.0 Saturated NA NA NA NA NA NA NA NA NA NA NA
MW-09D (3.5-5)0.1 Saturated 5.7 j <9 <9 23.3 23.7 37.9 26000 656 19.2 <430 55.4
MW-09D (63.5-65)0.1 Saturated 6.9 j <7.1 <7.1 12.1 j 8.3 <7.1 14400 440 35 <343 26.6
MW-15D (3.5-5)9.2 Unsaturated 5.3 j <7.9 <7.9 40.1 30.1 6.6 j 48800 335 4.5 j+<381 118
MW-15D (13.5-15)9.2 Saturated 5.3 j <8.4 <8.4 33.5 29.5 17.4 36400 574 10.3 j+<434 74.4
OB-01 (33.5-35)43.4 Unsaturated 5.1 j <7.2 <7.2 <18 7.9 17.6 27400 905 <3.6 352 j 91
OB-01 (43.5-45)43.4 Saturated 5.1 j <9 <9 <22.5 4.4 15.9 36700 1270 <4.5 <444 128
OB-02 (38.5-40)46.9 Unsaturated 5.5 j <9.5 <9.5 26.7 2.7 36.1 41000 1950 3 j <488 130
OB-02 (48.5-50)46.9 Saturated 5.4 j <7.9 <7.9 16.2 j 1.8 j 16.8 24900 938 3.8 j <391 80.2
Prepared by: WJW Checked by: ALA
Notes:
- Bold highlighted concentration indicates exceedance of the Inactive Hazardous Sites Branch PSRG Table October 2016 for Protection of Groundwater
< - concentration not detected at or above the adjusted reporting limit.
j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
j- - Estimated concentration, biased low.
j+ - Estimated concentration, biased high.
mg/kg - Milligrams per kilogram
NA - Not analyzed
NE - Not established
S.U. - Standard Unit
- Bold highlighted concentration indicates exceedance of the proposed provisional background concentrations (PPBCs).
Proposed Provisional Background Concentrations (July 2017, draft currently under review)
TABLE 9-1
ASH PORE WATER, GROUNDWATER, SURFACE WATER, AND SEEP
ANALYTICAL METHODS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 9-1 - Ash Pore, GW, SW, Seep Analytical Methods Page 1 of 1
PARAMETER RL UNITS METHOD
pH NA SU Field Water Quality Meter
Specific Conductance NA µS/cm Field Water Quality Meter
Temperature NA ºC Field Water Quality Meter
Dissolved Oxygen NA mg/L Field Water Quality Meter
Oxidation Reduction Potential NA mV Field Water Quality Meter
Turbidity NA NTU Field Water Quality Meter
Ferrous Iron NA mg/L Field Test Kit
Aluminum 0.005 mg/L EPA 200.7 or 6010D
Antimony 0.001 mg/L EPA 200.8 or 6020B
Arsenic 0.001 mg/L EPA 200.8 or 6020A
Barium 0.005 mg/L EPA 200.7 or 6010C
Beryllium 0.001 mg/L EPA 200.8 or 6020A
Boron 0.05 mg/L EPA 200.7 or 6010C
Cadmium 0.001 mg/L EPA 200.8 or 6020A
Chromium 0.001 mg/L EPA 200.8 or 6010C
Cobalt 0.001 mg/L EPA 200.8 or 6020A
Copper 0.001 mg/L EPA 200.8 or 6020B
Iron 0.01 mg/L EPA 200.7 or 6010C
Lead 0.001 mg/L EPA 200.8 or 6020A
Manganese 0.005 mg/L EPA 200.7 or 6010C
Mercury (low level)0.005 ng/L 1631 ONLY
Molybdenum 0.001 mg/L EPA 200.8 or 6020B
Nickel 0.001 mg/L EPA 200.8 or 6020B
Selenium 0.001 mg/L EPA 200.8 or 6020A
Strontium 0.005 mg/L EPA 200.7 or 6010C
Thallium (low level)0.0002 mg/L EPA 200.8 or 6020A
Vanadium (low level)0.0003 mg/L EPA 200.8 or 6020A
Zinc 0.005 mg/L EPA 200.7 or 6010C
Radium 226 1 pCi/L EPA 903.1 Modified
Radium 228 1 pCi/L EPA 904.0/SW846 9320 Modified
Uranium (233, 234, 236, 238)Varies by Isotope ug/mL SW846 3010A/6020A
Alkalinity (as CaCO3)5 mg/L SM 2320B
Bicarbonate 5 mg/L SM 2320
Calcium 0.01 mg/L EPA 200.7
Carbonate 5 mg/L SM 2320
Chloride 0.1 mg/L EPA 300.0 or 9056A
Magnesium 0.005 mg/L EPA 200.7
Methane 0.01 mg/L RSK 175
Nitrate as Nitrogen 0.01 mg-N/L EPA 353.2
Potassium 0.1 mg/L EPA 200.7
Sodium 0.05 mg/L EPA 200.7
Sulfate 0.1 mg/L EPA 300.0 or 9056A
Sulfide 0.1 mg/L SM4500S2-D
Total Dissolved Solids 25 mg/L SM 2540C
Total Organic Carbon 0.1 mg/L SM 5310C/EPA9060A
Total Suspended Solids 2.5 mg/L SM 2450D
Arsenic Speciation Vendor Specific mg/L IC-ICP-CRC-MS
Iron Speciation Vendor Specific mg/L IC-ICP-CRC-MS
Manganese Speciation Vendor Specific mg/L IC-ICP-CRC-MS
Prepared by: RBI Checked by: SRW/TCP
Notes:
ºC - Degrees Celsius
µS/cm = micro-Siemens per centimeter
mg/L - Milligrams per liter
mg - N/L - Milligrams nitrogen per liter
mV - Millivolts
NA - Not analyzed
NTU - Nephelometric turbidity unit
pCi/L - picocuries per liter
RL = reporting limit
S.U. - Standard Unit
ug/mL - micrograms per milliliter
2.Analytical methods and reporting limits as presented were applicable at time of CSA field implementation in 2015.Analytical methods and reporting limits are updated periodically and
applied as appropriate.
INORGANICS
FIELD PARAMETERS
ADDITIONAL GROUNDWATER CONSTITUENTS
1. Select constituents will be analyzed for total and dissolved concentrations.
ANIONS/CATIONS
RADIONUCLIDES
TABLE 10-1
BACKGROUND GROUNDWATER DATA SUMMARY THROUGH FEBRUARY 2017
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 10-1 Background Groundwater Data Summary Page 1 of 4
pH Turbidity Alkalinity Aluminum Antimony Arsenic Barium Beryllium Bicarbonate
Alkalinity Boron Cadmium Calcium Carbonate
Alkalinity Chloride Chromium (VI)Chromium Cobalt Copper Iron Lead
SU NTU ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L
6.5-8.5 NE NE NE 1*10 700 4*NE 700 2 NE NE 250,000 NE 10 1*1000 300 15
Sample ID Sample
Collection Date
BG-1S 9/17/2015 5.6 9.5 10100 j+150 <0.5 <0.5 20 <0.2 10100 j+<50 <0.08 2170 <5000 1600 NA 0.79 j+1.3 2.5 190 0.089 j
BG-1S 10/7/2015 5.46 7.5 7300 256 <1 <1 24 <1 7300 <50 <1 826 B1 <5000 1600 NA <5 1.08 <5 183 <1
BG-1S 11/9/2015 5.3 7.48 6800 400 0.3 j 0.15 j 24 <0.2 6800 <50 <0.08 760 <5000 NA <0.03 0.74 j+0.93 1.5 j+520 0.073 j
BG-1S 12/9/2015 5.7 5.6 8800 <100 <0.5 <0.5 23 j+<0.2 8800 <50 <0.08 1150 <5000 2000 0.018 j 0.21 j+0.68 1.3 64 j+<0.1
BG-1S 3/14/2016 5.5 1 5500 <100 <0.5 <0.1 17.2 0.099 j+5500 <50 <0.08 588 <5000 1400 <0.03 0.33 j+0.42 0.44 j <50 <0.1
BG-1S 9/28/2016 5.3 1.2 5500 <100 <0.5 <0.1 16.9 0.022 j 5500 <50 <0.08 327 <5000 1500 0.11 j+0.32 j+0.26 <0.5 <50 <0.1
BG-1S 11/11/2016 5.4 0.7 4400 j 79.2 j <0.50 <0.10 18.4 0.035 j 4400 j <50 <0.080 409 <5000 1400 0.077 <0.50 0.34 0.51 j+77.6 <0.10
BG-1S 2/7/2017 5.28 2.89 6000 71 <1 <1 20 <1 6000 <50 <1 597 <5000 1700 NA <5 <1 <5 68 <1
BG-1S 2/8/2017 5.4 8 6200 <100 <0.5 <0.1 20.9 0.022 j 6200 <50 <0.08 600 <5000 1500 0.087 j 0.41 j 0.27 0.88 54.3 0.095 j
MW-7SR 12/6/2010 5.48 2.76 NA NA <1 <1 29 NA NA <50 <1 NA NA NA NA <5 NA <5 125 <1
MW-7SR 2/2/2011 5.33 2.84 NA NA <1 <1 20 NA NA <50 <1 NA NA NA NA <5 NA <5 790 <1
MW-7SR 6/6/2011 5.34 6.25 NA NA <1 <1 21 NA NA <50 <1 NA NA NA NA <5 NA <5 495 <1
MW-7SR 10/4/2011 5.37 4.39 NA NA <1 <1 18 NA NA <50 <1 NA NA NA NA <5 NA <5 532 <1
MW-7SR 2/22/2012 5.13 1.8 NA NA <1 <1 16 NA NA <50 <1 NA NA NA NA <5 NA <5 285 <1
MW-7SR 6/5/2012 5.19 0.8 NA NA <1 <1 15 NA NA <50 <1 NA NA NA NA <5 NA <5 520 <1
MW-7SR 10/3/2012 5.24 1.28 NA NA <1 <1 15 NA NA <50 <1 NA NA NA NA <5 NA <5 221 <1
MW-7SR 2/4/2013 5.12 1.34 7200 NA <1 <1 14 NA NA <50 <1 312 NA NA NA <5 NA <5 158 <1
MW-7SR 6/3/2013 4.96 0.81 <100 NA <1 <1 14 NA NA <50 <1 291 NA NA NA <5 NA <5 155 <1
MW-7SR 10/14/2013 5.29 9.17 6500 NA <1 <1 14 NA NA <50 <1 295 NA NA NA <5 NA <5 445 <1
MW-7SR 2/5/2014 5.06 3.02 7700 NA <1 <1 12 NA NA <50 <1 250 NA NA NA <5 NA <5 166 <1
MW-7SR 6/2/2014 5.05 5.66 <5000 NA <1 <1 14 NA NA <50 <1 268 NA NA NA <5 NA <5 117 <1
MW-7SR 10/6/2014 5.1 3.19 <5000 NA <1 <1 13 NA NA <50 <1 260 NA NA NA <5 NA <5 110 <1
MW-7SR 2/2/2015 5.05 4.65 <5000 NA <1 <1 14 NA NA <50 <1 262 NA NA NA <5 NA <5 154 <1
MW-7SR 6/1/2015 5.03 8.8 <5000 498 <1 <1 30 <1 <5000 <50 <1 246 <5000 NA NA 14 <1 13 558 <1
MW-7SR 10/7/2015 5.24 2.51 5100 51 <1 <1 14 <1 5100 <50 <1 274 B1 <5000 1900 NA <5 <1 <5 70 <1
MW-7SR 12/10/2015 5.3 7.3 5100 140 <0.5 <0.5 15 <0.2 5100 <50 <0.08 344 <5000 2100 0.25 0.88 j+1.4 0.34 j 420 0.11
MW-7SR 2/1/2016 5.19 3.97 <5000 51 2.19 <1 14 <1 <5000 <50 <1 306 <5000 1200 NA <5 <1 <5 116 <1
MW-7SR 6/6/2016 5.23 0.99 <5000 139 <1 <1 14 <1 <5000 82 <1 471 <5000 1900 NA <5 <1 <5 79 <1
MW-7SR 9/27/2016 5.2 0.01 5000 j <100 <0.5 <0.1 14 <0.1 5000 j <50 <0.08 301 <5000 1800 0.89 1.8 j+0.18 0.17 j 29.1 j+<0.1
MW-7SR 11/4/2016 4.9 2.6 4800 j 59.1 j <0.50 <0.10 13.2 0.061 j 4800 j <50 <0.080 232 <5000 2100 0.55 0.94 0.28 0.42 j 128 <0.10
MW-7SR 2/6/2017 5.23 6.15 <5000 106 <1 <1 14 <1 <5000 <50 <1 244 <5000 1900 NA <5 <1 <5 109 <1
MW-7SR 2/7/2017 5.2 5.3 4900 j 130 <0.5 <0.1 14.4 0.019 j 4900 j <50 <0.08 265 <5000 1900 0.82 1.1 0.49 0.52 216 0.14
BG-4S 9/27/2016 6.98 7.59 91000 130 0.16 j 0.35 59.9 0.01 j 91000 <50 <0.08 19400 <5000 2700 NA 0.63 j+1.1 0.33 j+293 <0.1
BG-4S 11/9/2016 6.8 9 93100 122 0.21 j 0.3 58.8 <0.10 93100 <50 <0.080 19400 <5000 2500 0.17 0.27 j 0.93 0.32 j 206 <0.10
BG-4S 2/6/2017 6.6 9.6 82100 112 0.23 j 0.28 56.2 0.012 j 82100 <50 <0.08 17400 <5000 2700 0.28 0.76 1.1 0.65 313 <0.1
GWA-14S 3/1/2016 5.8 1.9 NA <100 0.48 j 0.12 15 0.13 j+5500 <50 <0.08 1310 <5000 2800 <0.03 0.36 j+2 13.2 45 j <0.1
GWA-14S 6/28/2016 7.1 5.8 48500 64.2 j 0.11 j 0.43 42.1 <0.1 48500 <50 <0.08 18800 <5000 1000 <0.03 0.63 8.5 0.73 1890 <0.1
GWA-14S 11/9/2016 5.4 8.3 4000 j 71.6 j 0.13 j 0.1 22.7 0.055 j 4000 j <50 <0.080 731 <5000 850 j 0.3 1.2 11.3 1 913 0.11
GWA-14S 2/7/2017 5.4 8.9 2600 j 79.7 j 0.17 j 0.083 j 16.4 0.035 j 2600 j <50 <0.08 518 <5000 950 j 2.9 0.82 9.4 1.3 192 0.16
Analytical Parameter
Reporting Units
15A NCAC 02L Standard
Shallow
Field Parameters Analytical Results
TABLE 10-1
BACKGROUND GROUNDWATER DATA SUMMARY THROUGH FEBRUARY 2017
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 10-1 Background Groundwater Data Summary Page 2 of 4
Magnesium Manganese Mercury Methane Molybdenum Nickel Nitrate + Nitrite Potassium Selenium Sodium Strontium Sulfate Sulfide Thallium Total
Dissolved Solids
Total
Organic Carbon Vanadium Zinc Radium (Total)Uranium (Total)
ug/L ug/L ug/L ug/L ug/L ug/L ug - N/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L pCi/L ug/L
NE 50 1 NE NE 100 11 NE 20 NE NE 250,000 NE 0.2*500,000 NE 0.3*1000 NE NE
Sample ID Sample
Collection Date
BG-1S 9/17/2015 1130 96 <0.2 2.3 j+0.22 j 0.92 99 <5000 <0.5 <5000 15 <1000 <100 0.017 j <25000 8700 0.63 j 26 j+NA NA
BG-1S 10/7/2015 1210 98 <0.05 NA <1 <5 NA 807 <1 1370 11 480 NA <0.2 330000 NA 0.366 8 NA NA
BG-1S 11/9/2015 1090 95 <0.2 2.1 j+<0.5 1.7 j+70 <5000 <0.5 <5000 8.9 <1000 <100 0.029 j <25000 <1000 0.3 j 30 j+NA NA
BG-1S 12/9/2015 1310 62 j+<0.2 2.2 j+<0.5 0.98 100 <5000 <0.5 <5000 12 j+<1000 <100 <0.1 <25000 <1000 <1 9.8 j+NA NA
BG-1S 3/14/2016 1080 38.7 <0.2 2 j+<0.5 0.6 100 <5000 <0.5 <5000 8 760 j <100 <0.1 <25000 <1000 <0.3 7.4 j 0.0262 0.5
BG-1S 9/28/2016 1000 29.8 <0.2 <10 <0.5 0.58 120 <5000 <0.5 1120 j 7 <1000 <100 0.025 j+36000 j+NA <0.3 5.9 j NA 5
BG-1S 11/11/2016 995 35.1 <0.20 <10.0 <0.50 0.5 84 <5000 <0.50 1650 j 8 <1000 <100 0.022 j <25000 NA <0.30 5.9 j 0.2243 0.5
BG-1S 2/7/2017 1180 37 <0.05 NA <1 <5 NA 804 <1 1210 9 390 NA <0.2 <25000 NA <0.3 7 NA NA
BG-1S 2/8/2017 1100 31.3 <0.2 <10 <0.5 0.82 170 <5000 <0.5 1240 j 9.2 <1000 <100 <0.1 <25000 NA <0.3 6.3 j NA 0.5
MW-7SR 12/6/2010 NA 256 <0.05 NA NA 7 NA NA <1 NA NA 970 NA NA 120000 NA NA 6 NA NA
MW-7SR 2/2/2011 NA 413 <0.05 NA NA <5 NA NA <1 NA NA 220 NA NA <50000 NA NA <5 NA NA
MW-7SR 6/6/2011 NA 304 <0.05 NA NA <5 NA NA <1 NA NA 170 NA NA 22000 NA NA <5 NA NA
MW-7SR 10/4/2011 NA 167 <0.05 NA NA <5 NA NA <1 NA NA 170 NA NA <10000 NA NA <5 NA NA
MW-7SR 2/22/2012 NA 113 <0.05 NA NA <5 NA NA <1 NA NA <1000 NA NA 24000 NA NA <5 NA NA
MW-7SR 6/5/2012 NA 122 <0.05 NA NA <5 NA NA <1 NA NA 130 NA NA 32000 NA NA <5 NA NA
MW-7SR 10/3/2012 NA 67 <0.05 NA NA <5 NA NA <1 NA NA 190 NA NA 10000 NA NA <5 NA NA
MW-7SR 2/4/2013 1070 43 <0.05 NA NA <5 NA 776 <1 1110 NA 210 NA NA 15000 NA NA <5 NA NA
MW-7SR 6/3/2013 1020 38 <0.05 NA NA <5 NA 777 <1 1210 NA 150 NA NA <25000 NA NA <5 NA NA
MW-7SR 10/14/2013 1050 68 <0.05 NA NA <5 NA 799 <1 1050 NA 160 NA NA <25000 NA NA <5 NA NA
MW-7SR 2/5/2014 959 40 <0.05 NA NA <5 NA 737 <1 1120 NA 160 NA NA <25000 NA NA <5 NA NA
MW-7SR 6/2/2014 963 33 <0.05 NA NA <5 NA 737 <1 1180 NA 120 NA NA <25000 NA NA <5 NA NA
MW-7SR 10/6/2014 1000 31 <0.05 NA NA <5 NA 746 <1 1180 NA 140 NA NA <25000 NA NA <5 NA NA
MW-7SR 2/2/2015 991 40 <0.05 NA NA <5 NA 767 <1 1210 NA 170 NA NA <25000 NA NA 7 NA NA
MW-7SR 6/1/2015 1050 54 <0.05 NA <1 14 NA 814 <1 1240 NA 180 NA NA <25000 NA NA 18 NA NA
MW-7SR 10/7/2015 1000 25 <0.05 NA <1 <5 NA 790 <1 1210 <5 130 NA <0.2 <25000 NA <0.3 <5 NA NA
MW-7SR 12/10/2015 985 81 <0.2 7.6 j+<0.5 1.3 59 j+<5000 <0.5 <5000 2.5 j <1000 <100 <0.1 <25000 <1000 0.57 j 3.7 j NA NA
MW-7SR 2/1/2016 1080 32 <0.05 NA <1 <5 NA 842 <1 1110 <5 160 NA <0.2 <25000 NA <0.3 <5 NA NA
MW-7SR 6/6/2016 1060 30 <0.05 NA <1 <5 NA 793 <1 1280 <5 200 NA <0.2 <25000 NA <0.3 <5 NA NA
MW-7SR 9/27/2016 904 16.6 <0.2 20.3 <0.5 1.6 34 <5000 <0.5 1220 j 3.1 j 510 j <100 0.016 j <25000 NA <0.3 4.1 j+NA NA
MW-7SR 11/4/2016 978 25.8 <0.20 <10.0 <0.50 0.89 24 <5000 <0.50 1340 j 3.2 j 710 j <100 <0.10 26000 NA 0.13 j <10.0 NA NA
MW-7SR 2/6/2017 1090 19 <0.05 NA <1 <5 NA 799 <1 1300 <5 260 NA <0.2 N1 28000 NA <0.3 <5 NA NA
MW-7SR 2/7/2017 1040 32 <0.2 24.3 <0.5 1.3 26 <5000 <0.5 1300 j 3.3 j <1000 <100 <0.1 <25000 NA 0.26 j 5.2 j NA NA
BG-4S 9/27/2016 3690 732 <0.2 11.3 3.8 1.2 180 <5000 <0.5 12700 277 2300 <100 <0.1 138000 NA 1.9 3.1 j NA 0.095
BG-4S 11/9/2016 3820 698 <0.20 <10.0 3.9 1.1 150 <5000 <0.50 12800 293 1500 <100 <0.10 118000 NA 1.8 35.8 0.559 0.5
BG-4S 2/6/2017 3490 478 <0.2 23 2.1 1.3 180 <5000 <0.5 12600 254 1200 <100 <0.1 73000 NA 1.5 <10 NA 0.16
GWA-14S 3/1/2016 398 84 <0.2 2 j+<0.5 1.3 <20 <5000 <0.5 3020 j 12 2100 j+<100 <0.1 39000 j+39000 0.091 j 33 NA NA
GWA-14S 6/28/2016 688 1280 <0.2 <10 0.43 j 1.4 <20 <5000 <0.5 1410 j 208 <1000 <100 <0.1 59000 NA 0.21 j 3 j NA 0.064
GWA-14S 11/9/2016 226 481 <0.20 17.3 <0.50 4.3 <20 <5000 <0.50 801 j 7.7 <1000 <100 0.076 j <25000 NA 0.15 j 16 0.825 0.5
GWA-14S 2/7/2017 274 349 <0.2 <10 <0.5 2 11 j <5000 <0.5 763 j 4.4 j <1000 <100 0.027 j <25000 NA 0.13 j 14.5 NA 0.5
Analytical Parameter
Reporting Units
15A NCAC 02L Standard
Shallow
Analytical Results
TABLE 10-1
BACKGROUND GROUNDWATER DATA SUMMARY THROUGH FEBRUARY 2017
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 10-1 Background Groundwater Data Summary Page 3 of 4
pH Turbidity Alkalinity Aluminum Antimony Arsenic Barium Beryllium Bicarbonate
Alkalinity Boron Cadmium Calcium Carbonate
Alkalinity Chloride Chromium (VI)Chromium Cobalt Copper Iron Lead
SU NTU ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L
6.5-8.5 NE NE NE 1*10 700 4*NE 700 2 NE NE 250,000 NE 10 1*1000 300 15
Sample ID Sample
Collection Date
Analytical Parameter
Reporting Units
15A NCAC 02L Standard
Field Parameters Analytical Results
MW-7D 12/6/2010 5.79 0.74 NA NA <1 <1 25 NA NA <50 <1 NA NA NA NA <5 NA <5 <10 <1
MW-7D 2/2/2011 5.61 8.82 NA NA <1 <1 25 NA NA <50 <1 NA NA NA NA <5 NA <5 <10 <1
MW-7D 6/6/2011 5.79 0.59 NA NA <1 <1 26 NA NA <50 <1 NA NA NA NA <5 NA <5 <10 <1
MW-7D 10/4/2011 5.8 0.44 NA NA <1 <1 26 NA NA <50 <1 NA NA NA NA <5 NA <5 <10 <1
MW-7D 2/22/2012 5.56 1.48 NA NA <1 <1 26 NA NA <50 <1 NA NA NA NA <5 NA <5 <10 <1
MW-7D 6/5/2012 5.68 1.2 NA NA <1 <1 26 NA NA <50 <1 NA NA NA NA <5 NA <5 <10 <1
MW-7D 10/3/2012 5.68 0.29 NA NA <1 <1 27 NA NA <50 <1 NA NA NA NA <5 NA <5 <10 <1
MW-7D 2/4/2013 5.51 0.89 17000 NA <1 <1 27 NA NA <50 <1 2430 NA NA NA <5 NA <5 <10 <1
MW-7D 6/3/2013 5.5 0.42 15000 NA <1 <1 27 NA NA <50 <1 2530 NA NA NA <5 NA <5 <10 <1
MW-7D 10/14/2013 5.69 3 16000 NA 1.04 <1 27 NA NA <50 <1 2490 NA NA NA <5 NA <5 <10 <1
MW-7D 2/5/2014 5.62 2.05 16000 NA <1 <1 26 NA NA <50 <1 2440 NA NA NA <5 NA <5 <10 <1
MW-7D 6/2/2014 5.48 4.73 11000 NA <1 <1 27 NA NA <50 <1 2510 NA NA NA <5 NA <5 <10 <1
MW-7D 10/6/2014 5.61 3.25 11000 NA <1 <1 26 NA NA <50 <1 2450 NA NA NA <5 NA <5 26 <1
MW-7D 2/2/2015 5.56 6.5 14000 NA <1 <1 27 NA NA <50 <1 2500 NA NA NA <5 NA <5 <10 <1
MW-7D 6/1/2015 5.47 3.04 16500 22 <1 <1 28 <1 16500 <50 <1 2450 <5000 NA NA <5 <1 <5 20 <1
MW-7D 9/16/2015 5.67 1.3 15600 <100 <0.5 <0.5 26 <0.2 15600 <50 <0.08 2550 <5000 1100 j+0.58 j 0.75 j+<0.5 0.44 j+<50 <0.1
MW-7D 10/7/2015 5.71 4.57 16600 52 <1 <1 27 <1 16600 <50 <1 2510 B1 <5000 1100 NA <5 <1 <5 35 <1
MW-7D 12/9/2015 5.9 1 18000 <100 <0.5 <0.5 28 <0.2 18000 <50 <0.08 3060 <5000 1400 0.87 0.87 j+<0.5 0.42 j <50 <0.1
MW-7D 2/1/2016 5.76 1.94 17600 5 1.82 <1 27 <1 17600 <50 <1 2620 <5000 520 NA <5 <1 <5 <10 <1
MW-7D 3/23/2016 5.4 0.8 17500 <100 <0.5 <0.1 29.3 <0.1 17500 <50 <0.08 2620 <5000 1400 1.2 1.3 j+0.02 j 0.33 j <50 <0.1
MW-7D 6/6/2016 5.72 0.53 16300 63 <1 <1 28 <1 16300 147 <1 3440 <5000 1200 NA <5 <1 <5 19 <1
MW-7D 6/28/2016 5.8 5.5 16800 96.6 j <0.5 <0.1 30 0.01 j 16800 <50 <0.08 2700 <5000 950 j 0.68 0.87 0.091 j 0.51 82.5 <0.1
MW-7D 9/27/2016 5.8 1.8 17200 50.1 j <0.5 <0.1 28.9 <0.1 17200 <50 <0.08 2530 <5000 1000 0.74 1.1 j+0.038 j 0.67 56.3 j+0.7
MW-7D 10/3/2016 5.56 8.82 16500 7 <1 <1 28 <1 16500 <50 <1 2420 <5000 1400 NA <5 <1 <5 11 <1
MW-7D 11/4/2016 5.7 0.5 17100 <100 0.11 j <0.10 28 0.055 j 17100 <50 <0.080 2710 <5000 1200 0.67 1.2 0.025 j 0.5 <50.0 <0.10
MW-7D 2/6/2017 5.72 2.74 15900 28 <1 <1 27 <1 15900 <50 <1 2750 <5000 1200 NA <5 <1 <5 28 <1
BG-4D 9/27/2016 7.19 8.94 94700 <100 0.38 j 0.61 18.2 <0.1 94700 <50 <0.08 27400 <5000 6000 0.92 17.3 0.28 0.66 j+137 <0.1
BG-4D 2/6/2017 7 3 97000 <100 0.28 j 0.58 17.6 0.013 j 97000 <50 <0.08 27400 <5000 5600 1.1 4.1 0.12 0.26 j 26.3 j <0.1
BG-5D 9/28/2016 7.99 6.93 141000 169 0.8 j+0.49 105 <0.1 141000 <50 <0.08 46600 <5000 10800 0.76 1.8 j+0.38 <0.5 142 0.12
BG-5D 11/10/2016 7.8 6.9 147000 77.0 j 1.1 0.49 105 0.021 j 147000 <50.0 <0.080 41100 <5000 10700 0.9 1.7 j+0.43 0.61 55.5 0.094 j
BG-5D 2/6/2017 8.2 9.2 139000 55.6 j 2.2 0.42 84.4 <0.1 139000 <50 <0.08 32900 <5000 10600 2.1 2.7 0.18 0.49 j 26.5 j <0.1
BG-5BR 4/22/2016 7.9 5.4 119000 83.3 j 1.4 0.37 145 <0.1 119000 <50 <0.08 39700 <5000 14500 0.17 1.2 j+0.09 j 0.43 j+41.2 j <0.1
BG-5BR 6/8/2016 7.75 1.26 132000 52.9 j 0.42 j 1.1 128 0.034 j 132000 <50 <0.08 46700 <5000 14500 0.014 j 1.5 0.074 j <0.5 108 <0.1
BG-5BR 11/4/2016 7.6 1.9 139000 <100 0.56 2.9 108 0.012 j 139000 <50 <0.080 38600 <5000 16000 0.021 j 0.89 j+0.063 j 0.24 j 125 <0.10
BG-5BR 2/6/2017 7.8 4.5 135000 59.2 j 2.9 0.85 135 <0.1 135000 <50 <0.08 43000 <5000 15200 0.16 1.4 0.088 j 0.45 j 113 <0.1
Prepared by: JHG Checked by: LWD
Notes:
54 - Indicates value omitted from dataset.
--- - Indicates parameter not measured or analyzed.
- Indicates data removed/identified as an outlier
- Indicates data removed due to autocorrelation
< - concentration not detected at or above the adjusted reporting limit.
* - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April, 1, 2013.
B1 - Target analyte detected in method blank at or above the reporting limit. Target analyte concentration in sample was greater than 10X the concentration in the method blank. Analyte concentration in sample is not affected by blank contamination.
j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
Radium (Total) - Combined Radium-226 and Radium-228
Uranium (Total) - Combined Uranium-233, Uranium-234, Uranium-236, and Uranium-238
J+ - Estimated concentration, biased high.
NA - Not analyzed
NE - Not established TDS - Total Dissolved Solids
NTU - Nephelometric turbidity unit TOC - Total Organic Carbon
pCi/L - picocuries per liter ug/L - Micrograms per liter
S.U. - Standard Unit ug - N/L - Milligrams nitrogen per liter
Bedrock
Deep
TABLE 10-1
BACKGROUND GROUNDWATER DATA SUMMARY THROUGH FEBRUARY 2017
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 10-1 Background Groundwater Data Summary Page 4 of 4
Magnesium Manganese Mercury Methane Molybdenum Nickel Nitrate + Nitrite Potassium Selenium Sodium Strontium Sulfate Sulfide Thallium Total
Dissolved Solids
Total
Organic Carbon Vanadium Zinc Radium (Total)Uranium (Total)
ug/L ug/L ug/L ug/L ug/L ug/L ug - N/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L pCi/L ug/L
NE 50 1 NE NE 100 11 NE 20 NE NE 250,000 NE 0.2*500,000 NE 0.3*1000 NE NE
Sample ID Sample
Collection Date
Analytical Parameter
Reporting Units
15A NCAC 02L Standard
Analytical Results
MW-7D 12/6/2010 NA <5 <0.05 NA NA <5 NA NA <1 NA NA 220 NA NA <50000 NA NA <5 NA NA
MW-7D 2/2/2011 NA <5 <0.05 NA NA <5 NA NA <1 NA NA 210 NA NA <50000 NA NA <5 NA NA
MW-7D 6/6/2011 NA <5 <0.05 NA NA <5 NA NA <1 NA NA 210 NA NA 45000 NA NA <5 NA NA
MW-7D 10/4/2011 NA <5 <0.05 NA NA <5 NA NA <1 NA NA 220 NA NA 27000 NA NA <5 NA NA
MW-7D 2/22/2012 NA <5 <0.05 NA NA <5 NA NA <1 NA NA <1000 NA NA 47000 NA NA <5 NA NA
MW-7D 6/5/2012 NA <5 <0.05 NA NA <5 NA NA <1 NA NA 190 NA NA 40000 NA NA <5 NA NA
MW-7D 10/3/2012 NA <5 <0.05 NA NA <5 NA NA <1 NA NA 200 NA NA 30000 NA NA <5 NA NA
MW-7D 2/4/2013 898 <5 <0.05 NA NA <5 NA 949 <1 3330 NA 250 NA NA 39000 NA NA <5 NA NA
MW-7D 6/3/2013 919 <5 <0.05 NA NA <5 NA 975 <1 3510 NA 180 NA NA 32000 NA NA <5 NA NA
MW-7D 10/14/2013 923 <5 <0.05 NA NA <5 NA 960 <1 3370 NA 200 NA NA 42000 NA NA <5 NA NA
MW-7D 2/5/2014 927 <5 <0.05 NA NA <5 NA 960 <1 3280 NA 180 NA NA 42000 NA NA 6 NA NA
MW-7D 6/2/2014 906 <5 <0.05 NA NA <5 NA 940 <1 3470 NA 150 NA NA 41000 NA NA 6 NA NA
MW-7D 10/6/2014 900 <5 <0.05 NA NA <5 NA 938 <1 3340 NA 160 NA NA 34000 NA NA <5 NA NA
MW-7D 2/2/2015 901 <5 <0.05 NA NA <5 NA 961 <1 3370 NA 160 NA NA 29000 NA NA 7 NA NA
MW-7D 6/1/2015 929 <5 <0.05 NA <1 <5 NA 958 <1 3480 NA 140 NA NA 47000 NA NA <5 NA NA
MW-7D 9/16/2015 871 <5 <0.2 1.8 j+<0.5 0.22 j 19 j <5000 <0.5 3120 j 41 <1000 <100 <0.1 49000 <1000 <1 3.3 j NA NA
MW-7D 10/7/2015 903 <5 <0.05 NA <1 <5 NA 967 <1 3290 43 140 NA <0.2 25000 NA <0.3 <5 NA NA
MW-7D 12/9/2015 1010 <5 <0.2 1.3 j+<0.5 0.18 j 25 <5000 <0.5 3680 j 47 <1000 <100 0.021 j 43000 <1000 <1 9.6 j NA NA
MW-7D 2/1/2016 959 <5 <0.05 NA <1 <5 NA 1000 <1 3420 43 140 NA <0.2 49000 NA <0.3 <5 NA NA
MW-7D 3/23/2016 944 <5 <0.2 1.4 j+<0.5 0.56 <20 <5000 <0.5 3570 j 48.9 <1000 <100 <0.1 32000 <1000 0.17 j 6.6 j NA NA
MW-7D 6/6/2016 951 <5 <0.05 NA <1 <5 NA 968 <1 3570 45 190 NA <0.2 35000 NA <0.3 93 NA NA
MW-7D 6/28/2016 1000 4.5 j <0.2 <10 <0.5 <0.5 <20 <5000 <0.5 3570 j 46.1 <1000 <100 <0.1 33000 NA 0.29 j 3.2 j NA NA
MW-7D 9/27/2016 876 2.6 j <0.2 <10 <0.5 <0.5 27 <5000 <0.5 3240 j 44.6 580 j <100 0.025 j 30000 NA 0.12 j+6.7 j+NA NA
MW-7D 10/3/2016 921 <5 <0.05 NA <1 <5 NA 982 <1 3210 43 190 NA <0.2 31000 NA <0.3 <5 NA NA
MW-7D 11/4/2016 960 <5.0 <0.20 <10.0 <0.50 <0.50 <20 <5000 <0.50 3420 j 44.8 900 j <100 0.023 j 42000 NA 0.22 j <10.0 NA NA
MW-7D 2/6/2017 965 <5 <0.05 NA <1 <5 NA 977 <1 3300 41 310 NA <0.2 N1 42000 NA <0.3 <5 NA NA
BG-4D 9/27/2016 4370 9 <0.2 <10 2.6 9.2 150 4280 j 0.39 j 12200 217 14400 <100 <0.1 179000 NA 6.4 2.5 j NA 0.88
BG-4D 2/6/2017 4620 7.9 <0.2 <10 1.6 2.3 1800 3220 j 0.34 j 11900 217 7600 <100 <0.1 138000 NA 5.1 <10 NA 0.68
BG-5D 9/28/2016 7230 47.6 <0.2 <10 7.2 1 2000 7360 1.7 16600 712 24800 <100 <0.1 255000 j+NA 2.6 9.2 j NA 0.85
BG-5D 11/10/2016 6990 30.1 <0.20 <10.0 7.3 0.85 1700 8830 1.3 17000 697 21900 <100 <0.10 211000 NA 2.2 5.1 j 0.637 1.1
BG-5D 2/6/2017 6810 3 j <0.2 <10 7 0.94 2100 16500 1.7 23300 629 22800 <100 <0.1 168000 NA 2.3 7.3 j NA 0.78
BG-5BR 4/22/2016 6600 13.1 <0.2 <10 2.3 0.6 <20 5740 0.57 16200 892 26400 <100 <0.1 197000 <1000 1.2 10.5 j+NA NA
BG-5BR 6/8/2016 7460 22.2 <0.2 <10 3.2 0.87 <20 3020 j <0.5 17800 908 29000 <100 <0.1 223000 NA 0.2 j <10 0.494 0.65
BG-5BR 11/4/2016 6320 24.5 <0.20 41.7 10 0.46 j <20 2640 j <0.50 23700 897 26800 100 <0.10 201000 NA 0.24 j <10.0 0.1815 0.99
BG-5BR 2/6/2017 6800 20.9 <0.2 <10 3.1 0.75 <20 4570 j <0.5 17700 961 24100 2000 <0.1 179000 NA 0.33 2.7 j NA 0.54
Prepared by: JHG Checked by: LWD
Notes:
54 - Indicates value omitted from dataset.
--- - Indicates parameter not measured or analyzed.
- Indicates data removed/identified as an outlier
- Indicates data removed due to autocorrelation
< - concentration not detected at or above the adjusted reporting limit.
* - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April, 1, 2013.
B1 - Target analyte detected in method blank at or above the reporting limit. Target analyte concentration in sample was greater than 10X the concentration in the method blank. Analyte concentration in sample is not affected by blank contamination.
j - Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
Radium (Total) = Combined Radium-226 and Radium-228
Uranium (Total) = Combined Uranium-233, Uranium-234, Uranium-236, and Uranium-238
J+ = Estimated concentration, biased high.
NA - Not analyzed
NE - Not established TDS = Total Dissolved Solids
NTU - Nephelometric turbidity unit TOC = Total Organic Carbon
pCi/L - picocuries per liter ug/L - Micrograms per liter
S.U. - Standard Unit ug - N/L - Milligrams nitrogen per liter
Bedrock
Deep
TABLE 10-2
PROVISIONAL BACKGROUND THRESHOLD VALUES FOR GROUNDWATER
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 10-2 Provisional Background Threshold Values for GW Page 1 of 1
Shallow Deep Bedrock†
pH*S.U.6.5-8.5 4.9 - 7 5.4 - 8.2 7.6 - 7.8
Alkalinity mg/L NE 82.1 139 139
Aluminum µg/L NE 178 122 100
Antimony µg/L 1∆1 1.1 2.9
Arsenic µg/L 10 1 1 2.9
Barium µg/L 700 42.1 84.4 135
Beryllium µg/L 4∆0.144 1 0.1
Bicarbonate mg/L NE 82.1 147 139
Boron µg/L 700 50 50 50
Cadmium µg/L 2 0.08 0.1 0.08
Calcium mg/L NE 18.8 32.9 46.7
Carbonate mg/L NE 5 5 5
Chloride mg/L 250 3.34 10.7 16
Chromium (VI)µg/L NE 1 1.2†0.16
Chromium µg/L 10 5 5 1.5
Cobalt µg/L 1∆14.2 0.547 0.088
Copper µg/L 1000 5 5 0.5
Iron µg/L 300 593 56.3 125
Lead µg/L 15 0.151 0 0.1
Magnesium mg/L NE 3.49 6.81 7.46
Manganese µg/L 50 478 7.9 24.5
Mercury µg/L 1 0.5 0.2 0.2
Methane µg/L NE 29.5 6.41†41.7
Molybdenum µg/L NE 2.1 7.3 10
Nickel µg/L 100 5 5 0.87
Nitrate + Nitrite mg-N/L 11 0.23 0.15†0.02
Potassium mg/L NE 5 5 4.57
Selenium µg/L 20 0.5 1.3 0.5
Sodium mg/L NE 12.6 17 23.7
Strontium µg/L NE 254 697 961
Sulfate mg/L 250 1.2 21.9 29
Sulfide mg/L NE 0.1 0.1†2
TDS mg/L 500 50 179 223
Thallium µg/L 0.2∆0.2 0.2 0.1
TOC mg/L NE 1† 1†1
Vanadium µg/L 0.3∆2.02 12 0.33
Zinc µg/L 1000 15 10 10
Radium (Total)pCi/L NE 0.825† ---0.494
Uranium (Total)µg/mL NE 0.0005† 0.864†0.001
Notes:
- Updated value based upon ongoing statistical evaluation since September 1, 2017 (Zimmerman to Draovitch; Appendix A
† - Indicates dataset contains less than 10 valid samples
* - Upper and lower tolerance limits calculated for parameter
∆ - Interim Maximum Allowable Concentrations (IMACs) of 15A NCAC .02L Standard, Appendix 1, April 1, 2013
mg/L - milligrams per liter
mg - N/L = Milligrams nitrogen per liter
NA - Not applicable; dataset contains only 1 valid sample
NE - Not Established
pCi/L - picocuries per liter
Radium (Total) - Radium-226 and Radium-228 combined
S.U. - Standard Unit
TDS - Total Dissolved Solids
TOC = Total Organic Carbon
µg/L - micrograms per liter
µg/mL - micrograms per milliliter
Uranium (Total) - Uranium-233, Uranium-234, Uranium-236, and Uranium-238 combined
Provisional Background Threshold Values
NCAC 02L StandardReporting UnitParameter
Prepared by: JHG Checked by: KDF
TABLE 10-3
STATE AND FEDERAL STANDARDS FOR COIS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\
Table 10-3 State and Federal Standards for COIs Page 1 of 1
Constituent
NCAC 2L
Groundwater
Standard
(µg/L)
EPA Primary
MCL
(µg/L)
EPA Secondary
MCL
(µg/L)
IMAC
(µg/L)
Antimony -6 -1
Arsenic 10 10 --
Beryllium -4 -4
Boron 700 ---
Chromium 10 100 --
Hexavalent Chromium ----
Cobalt ---1
Iron 300 -300 -
Manganese 50 -50 -
Strontium ----
Sulfate 250,000 -250,000 -
TDS 500,000 -500,000 -
Vanadium ---0.3
Prepared by: WJW Checked by: LWD
Notes:
*Standard Units
1 - Radium units shown as pCi/L (picocurie per Liter)
µg/L - micrograms per Liter
- - Not applicable
TABLE 11-1
SUMMARY OF Kd VALUES FROM BATCH AND COLUMN STUDIES
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 11-1 Sum of Kd Values Batch and Column Studies Page 1 of 1
Arsenic Boron Cadmium Chromium Molybdenum Selenium Thallium Vanadium
Trial - A 904 0 1555 1719 18 145 541 872
Trial - B 874 0 1470 1719 16 124 513 788
Trial - A 5279 2 72 -6549 10247 74 4936
Trial - B 5225 2 79 -9747 11143 82 4936
Trial - A 91 -118 -317 573 112 1547
Trial - B 92 -120 -342 589 113 1650
Trial - A --------
Trial - B --------
Trial - A 6 1 281 5 0.2 1 255 3
Trial - B 6 0 291 15 0.1 0.2 319 3
Trial - A 18 -1256 72 0.3 2 83 13
Trial - B 19 -1205 66 0.1 2 93 14
Trial - A 9058 2 325 259 10380 12580 256 5385
Trial - B 9058 2 321 270 10380 12580 256 5385
Trial - A 2137 0 965 733 44 398 692 794
Trial - B 2265 0 1000 867 55 437 696 981
Trial - A 788 0.7 1281 1719 25 129 934 922
Trial - B 726 0.6 1385 1719 21 135 835 802
Trial - A 306 1 119 -53 112 132 651
Trial - B 274 1 116 -44 88 117 533
Trial - A 1993 3 45 1936 10380 3158 58 5385
Trial - B 1687 2 38 1936 10380 3097 53 5385
Trial - A 2408 2 46 1719 10475 1955 55 5333
Trial - B 2512 3 46 1719 10475 1650 55 5333
Trial - A 1827 3 1075 1719 123 274 1018 1072
Trial - B 1991 3 1261 1719 134 280 1076 1151
Trial - A 3512 2 187 1936 10380 12580 196 5390
Trial - B 3506 2 176 1936 10380 12580 201 5390
676.7 1.7 288.3 577.4 168.7 345.6 208.7 843.6
1757.0 2.0 286.0 1719.0 128.5 417.5 198.5 1111.5
228.5 0.45 106.75 261.75 20.25 121 82.75 753.75
1 Trial Only 250 10 525 520 40 60 475 200
1 Trial Only 600 12 60 600 600 550 110 600
1 Trial Only 400 10 70 490 190 195 120 310
1 Trial Only 250 9 70 525 115 70 80 180
1 Trial Only --------
1 Trial Only --------
1 Trial Only 160 8 155 335 85 90 100 120
1 Trial Only 420 7 400 390 100 220 390 400
1 Trial Only 320 NA 525 550 65 90 525 300
Trial A 90 NA 75 490 85 45 55 105
Trial B 90 NA 75 475 75 40 60 100
Trial C 120 NA 150 500 90 55 80 130
1 Trial Only 280 NA 40 625 160 130 35 210
1 Trial Only 280 NA 30 475 135 150 45 275
1 Trial Only 700 NA 950 950 110 210 925 575
1 Trial Only 450 NA 200 450 200 285 130 450
263.4 9.2 138.6 512.0 115.9 117.2 132.5 238.8
280.0 9.5 112.5 495.0 105.0 110.0 105.0 242.5
150.0 7.8 67.5 468.8 82.5 58.8 58.8 127.5
Prepared by: LWD Checked by: WJW
Notes:
- - No Data
* - Column study not done, bedrock sample
Units reported in milliliters per gram (mL/g)
Kd values presented were taken from the Langley et al. (2015) and Langley et al. (2016) sorption reports.
Only Kd values for constituents present in the test solution are presented in the table above.
GWA-1BRU (78-79)
AS-2S (90)
Batch Study
Sample Site and Depth (feet)
AB-4D (55-60)
AB-6S (73-75)
AB-7S (20-25)
GWA-7D (102-103.5)
GWA-8D (19-20)
Geometric Mean
Median
Lower Quartile (exclusive)
GWA-10S (21-23)
GWA-7S (22-23)
GWA-6S (55-60)
GWA-1S (42-47)
GWA-2S (48-52)
GWA-4S (20-25)
GWA-5S (72-74)
Column Study
AB-4D (55-60)
AB-6S (73-75)
AB-7S (20-25)
AS-2S (90)
GWA-1BRU (78-79)*
GWA-7D (102-103.5)*
Geometric Mean
Median
Lower Quartile (exclusive)
GWA-8D (19-20)
GWA-1S (42-47)
GWA-6S (55-60)
GWA-5S (72-74)
GWA-2S (48-52)
GWA-4S (20-25)
GWA-7S (22-23)
GWA-10S (21-23)
GWA-4S (20-25)
GWA-4S (20-25)
TABLE 15-1
GROUNDWATER INTERIM MONITORING PROGRAM
SAMPLING PARAMETERS AND ANALYTICAL METHODS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 15-1 Groundwater IMP Page 1 of 1
PARAMETER RL UNITS METHOD
pH NA SU Field Water Quality Meter
Specific Conductance NA µS/cm Field Water Quality Meter
Temperature NA ºC Field Water Quality Meter
Dissolved Oxygen NA mg/L Field Water Quality Meter
Oxidation Reduction Potential NA mV Field Water Quality Meter
Eh NA mV Field Water Quality Meter
Turbidity NA NTU Field Water Quality Meter
Aluminum 0.005 mg/L EPA 200.7 or 6010D
Antimony 0.001 mg/L EPA 200.8 or 6020B
Arsenic 0.001 mg/L EPA 200.8 or 6020B
Barium 0.005 mg/L EPA 200.7 or 6010D
Beryllium 0.001 mg/L EPA 200.8 or 6020B
Boron 0.05 mg/L EPA 200.7 or 6010D
Cadmium 0.001 mg/L EPA 200.8 or 6020B
Chromium 0.001 mg/L EPA 200.8 or 6020B
Cobalt 0.001 mg/L EPA 200.8 or 6020B
Copper 0.001 mg/L EPA 200.8 or 6020B
Hexavalent Chromium 0.000025 mg/L EPA 218.7
Iron 0.01 mg/L EPA 200.7 or 6010D
Lead 0.001 mg/L EPA 200.8 or 6020B
Manganese 0.005 mg/L EPA 200.7 or 6010D
Mercury 0.00005 mg/L EPA 245.1 or 7470A
Molybdenum 0.001 mg/L EPA 200.8 or 6020B
Nickel 0.001 mg/L EPA 200.8 or 6020B
Selenium 0.001 mg/L EPA 200.8 or 6020B
Strontium 0.005 mg/L EPA 200.7 or 6010D
Thallium (low level)0.0002 mg/L EPA 200.8 or 6020B
Vanadium (low level)0.0003 mg/L EPA 200.8 or 6020B
Zinc 0.005 mg/L EPA 200.7 or 6010D
Radium 226 1 pCi/L EPA 903.1 Modified
Radium 228 1 pCi/L EPA 904.0/SW846 9320 Modified
Uranium (233, 234, 236, 238)Varies by isotope µg/mL SW846 3010A/6020B
Total Uranium NA µg/mL Calculated
Alkalinity (as CaCO3)5 mg/L SM 2320B
Bicarbonate 5 mg/L SM 2320B
Calcium 0.01 mg/L EPA 200.7
Carbonate 5 mg/L SM 2320B
Chloride 0.1 mg/L EPA 300.0 or 9056A
Magnesium 0.005 mg/L EPA 200.7 or 6010D
Potassium 0.1 mg/L EPA 200.7
Sodium 0.05 mg/L EPA 200.7
Sulfate 0.1 mg/L EPA 300.0 or 9056A
Sulfide 0.1 mg/L SM 4500 S2 D
Total Dissolved Solids 25 mg/L SM 2540C
Total Organic Carbon 0.1 mg/L SM5310C/EPA9060A
Total Suspended Solids 5 mg/L SM 2450D
Prepared by: HHS Checked by: MCM
Notes:
µg/mL - micrograms per milliliter
µS/cm - micrograms per centimeter
mg/L - Milligrams per liter
mV - Millivolts
NA indicates not applicable.
NTU - Nephelometric turbidity unit
ºC - Degrees Celsius
pCi/L - picocuries per liter
S.U. - Standard Unit
FIELD PARAMETERS
INORGANICS
RADIONUCLIDES
ANIONS/CATIONS/OTHER
TABLE 15-2
INTERIM GROUNDWATER MONITORING PLAN SAMPLE LOCATIONS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 15-2 Interim
Monitoring Plan Sample Locations Page 1 of 3
Well ID /
Sampling
Location
Description
Approximate
Well Total Depth
(ft. bgs)
Well Screen
Length
(ft)
Top of
screen
(ft. bgs)
Bottom of
screen
(ft. bgs)
Groundwater
AB-1D CAMA 198 5 193 198
AB-1S CAMA 44 15 29 44
AB-2D CAMA 156 5 151 156
AB-2S CAMA 65 15 50 65
AB-8D CAMA 96 5 91 96
AB-8S CAMA 28 15 13 28
BG-1DA CAMA 199.2 5 194.2 199.2
BG-1S CAMA 45 15 30 45
BG-2BR CAMA 208 5 203 208
BG-2D CAMA 160 5 155 160
BG-2S CAMA 65 16 49 65
BG-3D CAMA 105 5 100 105
BG-3S CAMA 36.6 15 21.1 36.6
BG-4BR*CAMA 171 5 166 171
BG-4D*CAMA 139 10 129 139
BG-4S*CAMA 70 15 55 70
BG-5BR CAMA 136 5 131 136
BG-5D CAMA 104 5 99 104
C-1BRUA CAMA 120 5 115 120
C-1S CAMA 15 10 5 15
C-2D CAMA 138 5 133 138
C-2S CAMA 33 15 18 33
GWA-01BRU CAMA 77 5 72 77
GWA-01S CAMA 43 15 28 43
GWA-02BR*CAMA 120 5 115 120
GWA-02BRU*CAMA 82 5 77 82
GWA-02S*CAMA 50 15 35 50
GWA-03BR CAMA 94 10 84 94
GWA-03D CAMA 47 5 42 47
GWA-03SA CAMA 28 15 13 28
GWA-04BR CAMA 180 5 175 180
GWA-04D*CAMA 125 5 120 125
GWA-04S*CAMA 32 15 17 32
GWA-05D CAMA 217 5 212 217
GWA-05S CAMA 75 15 60 75
GWA-06D*CAMA 148 5 143 148
GWA-06S*CAMA 60 15 45 60
GWA-07BR CAMA 132 5 127 132
GWA-07D CAMA 105 5 100 105
GWA-07S CAMA 20 15 5 20
GWA-08D*CAMA 116 5 111 116
GWA-08S*CAMA 23 25 8 23
GWA-09BR*CAMA 111 5 106 111
GWA-09D*CAMA 67 5 62 67
GWA-09S*CAMA 15 10 5 15
TABLE 15-2
INTERIM GROUNDWATER MONITORING PLAN SAMPLE LOCATIONS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 15-2 Interim
Monitoring Plan Sample Locations Page 2 of 3
Well ID /
Sampling
Location
Description
Approximate
Well Total Depth
(ft. bgs)
Well Screen
Length
(ft)
Top of
screen
(ft. bgs)
Bottom of
screen
(ft. bgs)
Groundwater
GWA-10BRU CAMA 138.5 5 133.5 138.5
GWA-10S CAMA 22.5 15 7.5 22.5
GWA-11D CAMA 115 5 110 115
GWA-11S CAMA 32 15 17 32
GWA-12D*CAMA 138 5 133 138
GWA-12S*CAMA 32 15 17 32
GWA-13D CAMA 282 5 277 282
GWA-13S CAMA 59 15 44 59
GWA-14D CAMA 211 5 206 211
GWA-14S CAMA 82 18 64 82
GWA-15D CAMA 118 10 108 118
GWA-15S*CAMA 45 15 30 45
GWA-20BR CAMA 200 5 195 200
GWA-20DA CAMA 258 5 253 258
GWA-20S CAMA 53 15 37 53
GWA-21BR CAMA 200 5 195 200
GWA-21D CAMA 150 5 145 150
GWA-21S CAMA 50 5 45 50
GWA-22BRA*CAMA 277 5 272 277
GWA-22D*CAMA 100 5 95 100
GWA-22S*CAMA 57 15 42 57
GWA-23BR CAMA 290 5 285 290
GWA-23DA CAMA 226 5 221 226
GWA-23S CAMA 50 15 33 48
MW-01D CAMA 64.3 5 59.3 64.3
MW-01S CAMA 17.66 10 7.66 17.66
MW-02D CAMA 91.35 5 86.35 91.35
MW-02SA CAMA 51 15 36 51
MW-03D CAMA 36.5 5 31.5 36.5
MW-03S CAMA 16.28 10 6.28 16.28
MW-04D CAMA 60 5 55 60
MW-04S CAMA 20 10 10 20
MW-05D CAMA 79 5 74 79
MW-05S CAMA 15 10 5 15
MW-06D CAMA 77.32 5 72.32 77.32
MW-06S CAMA 17.64 10 7.64 17.64
MW-07BRA*CAMA 201 5 196 201
MW-07D*NPDES 97.68 5 97.68 102.68
MW-07SR*NPDES 46.92 20 46.92 66.92
MW-08D NPDES 200 10 190 200
MW-08I NPDES 120 20 100 120
MW-08S NPDES 60 20 40 60
MW-09*NPDES 28 15 13 28
MW-09BRA*CAMA 152 5 147 152
TABLE 15-2
INTERIM GROUNDWATER MONITORING PLAN SAMPLE LOCATIONS
RIVERBEND STEAM STATION
DUKE ENERGY CAROLINAS, LLC, MOUNT HOLLY, NC
P:\Duke Energy Carolinas\15. Riverbend\05.EHS CAMA Compliance Support\CSA Supplement 2017\Final\Tables\Table 15-2 Interim
Monitoring Plan Sample Locations Page 3 of 3
Well ID /
Sampling
Location
Description
Approximate
Well Total Depth
(ft. bgs)
Well Screen
Length
(ft)
Top of
screen
(ft. bgs)
Bottom of
screen
(ft. bgs)
Groundwater
MW-09DA*CAMA 106 5 101 106
MW-10*NPDES 25 5 20 25
MW-11DR NPDES 46 5 41 46
MW-11SR NPDES 30.5 15 15.5 30.5
MW-13 NPDES 18 15 3 18
MW-14*NPDES 40 15 25 40
MW-15 NPDES 13 15 3 18
MW-15BR CAMA 62 10 52 62
MW-15DA CAMA 44 5 39 44
Area of Wetness/Surface Water
RBSW002 CAMA NA NA NA NA
S-1 CAMA NA NA NA NA
S-10 CAMA NA NA NA NA
S-12 CAMA NA NA NA NA
S-2 CAMA NA NA NA NA
S-4 CAMA NA NA NA NA
SW-3 CAMA NA NA NA NA
Prepared by: WJW Checked by: LWD
Notes:
* Sample for Radionuclides