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Home My WebLink AboutNC0038377_Table 12-4 Alluvial GW Results_20150902TABLE 12-4 RISK SCREENING TABLE: ALLUVIAL GROUNDWATER DATA MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Water Spec Ferrous Aluminum Antimony Arsenic Barium Beryllium Bi- Boron Cadmium Calcium Carbonate Chromium Cobalt Copper Analytical Parameter Redox Assignment pH Temp DO ORP Eh Turbidity Alkalinity carbonate Chloride Cr(III)/Cr(VI) Level Cond Iron Alkalinity Alkalinity DIS TOT DIS TOT DIS TOT DIS TOT DIS TOT DIS TOT DIS TOT TOT DIS TOT DIS I TOT DIS TOT Reporting Units None S.U. ft Deg C umhnos mg/l mV mV NTU mg/l mg/l ug/I ug/l ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I mg/1 ug/I ug/I ug/I ug/I 1 mg/I mg/I mg/I ug/I ug/I ug/I ug/I mg/I mg/I SSA NCAC 02L Standard NE 6.5-8.5 NE NE NE NE NE NE NE NE NE NE NE NE I 1* NE 10 NE 700 NE 4* NE NE 700 NE 2 NE NE 250 NE SO NE 1* NE 1 Sample ID Sample Field Parameters Analytical Results Collection Date ALLUVIAL MW-03�'� 03/19/2015 Mixed (oxic-anoxic) 5.7 6.75 11 343 1.65 304 508.5 3.35 NM 61 <5 34 <1 <1 <1 <1 54 56 <1 <1 61 815 847 <1 <1 27.9 <10 47 <1 <1 <1 <1 <0.001 <0.001 MW-16S�'� 06/23/2015 Mixed (oxic-anoxic) 6.0 3.88 20 144 29.6 96 301.1 3.44 NM 43 <5 17 <1 <1 <1 <1 46 46 <1 <1 43 <50 <50 <1 <1 9.57 <10 13 <1 <1 4.35 4.32 0.00418 0.00102 DETECTIONS/SAMPLES --- --- --- --- --- --- --- --- --- --- 2/2 0/2 2/2 0/2 0/2 0/2 0/2 2/2 2/2 0/2 0/2 2/2 1/2 1/2 0/2 0/2 2/2 0/2 2/2 0/2 0/2 1/2 1/2 1/2 1/2 AVERAGE ALLUVIAL WATER CONCENTRATION (DETECTIONS --- --- --- --- --- --- --- --- --- --- 43 --- 26 --- --- --- --- 50 51 --- --- 52 815 847 --- --- 18.74 --- 30 --- --- 4.35 4.32 0.00418 0.00102 ONLY) MAXIMUM ALLUVIUM GROUNDWATER CONCENTRATION --- --- --- --- --- --- --- --- --- --- 43 --- 34 --- --- --- --- 54 56 --- --- 61 815 847 --- --- 27.90 --- 47 --- --- 4.35 4.32 0.00418 0.00102 NUMBER OF ALLUVIUM GROUNDWATER SAMPLES --- --- --- --- --- --- --- --- --- --- 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 EXCEEDING 2L Detections/Samples --- --- --- --- --- --- --- --- --- --- --- 3/5 10/10 2/5 2/10 0/5 0/10 5/5 10/10 0/5 0/10 10/10 0/5 0/10 0/5 0/10 10/10 0/10 10/10 1/5 3/10 3/5 3/10 1/5 1/10 Average Background Concentrations (Detections Only) --- --- --- --- --- --- --- --- --- --- --- 13 314 1.64 1.48 --- --- 29 50 --- --- 127 --- --- --- --- 31.8 --- 16 1.59 1.5 1.24 1.29 0.00772 0.0045 Maximum Concentration --- --- --- --- --- --- --- --- --- --- --- 16 641 1.66 1.63 --- --- 46 97 --- --- 259 --- --- --- --- 58.1 --- 30 1.59 1.73 1.41 1.41 0.00772 0.0045 Number of Backgroundwater --- --- --- --- --- --- --- --- --- --- --- 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 Samples > 15A NCAC 2L Standard Coal Ash COPC North Carolina groundwater 2L Alluvium groundwater conc. > 2L Alluvium Water COPC No Yes No Yes No Yes No Yes No No No No Yes No No No No No No No No Yes No No No Yes Yes Yes Yes Yes Yesz No No No Yes Yes No Yes No No No No No No No No No No Yes No No No No No No No No Yes No No Notes - Bold highlighted concentration indicates exceedance of the 15A NCAC 02L Appendix 2, April 1, 2013. vee - Indicates support/rationale for soil COPC attributable to coal ash. Note 1: If analytical method detection limit or concentration exceeds soil RSL 0 - Indicates constituent is not a soil COPC attributable to coal ash. Note 2: If no 15A NCNA 2L Standard ORP = Oxidation Reduction Potential DIS = Dissolved TOT = Total Temp = Temperature my = millivolts Note 3: Hexavalent Chromium concentration is less than EPA screening value for tapwater (0.035 mg/Q. See Table 10-3 (USEPA Regional Screening Levels [RSLs] rev., June 26. 2015). NE = Not established Note 4: Hexavalent Chromium concentration is greater than EPA screening value for tapwater (0.035 ug/L). See Table 10-3 (USEPA Regional Screening Levels [RSLs] rev., June 26, 2015). NTU = nephelometric turbidity unit S.U. = Standard Unit DO = Dissolved Oxygen ug/I = microgram per liter Deg C = Degree Celsius umhos/cm = micro siemens per centimeter mg/I = milligrams per liter Spec Cond = Specific Conductance mg-N/L = miligram nitrogen per liter ft = feet --- = Not applicable < = concentration not detected at or above the reporting limit. * - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Appendix 1, April, 1, 2013. Prepared by: KDF Checked by: VTV P:\Duke Energy Progress. 1026\105. Mayo Ash Basin GW Assessment Plan\1.11 CSA Reporting\Tables\Draft Tables\Table 12-4 Alluvial GW Results.xlsx Page 1 of 2 TABLE 12-4 RISK SCREENING TABLE: ALLUVIAL GROUNDWATER DATA MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Iron Lead Magnesium Manganese Mercury Molybdenum Nickel Nitrate Potassium Selenium Sodium Strontium Thallium Total Total Total Vanadium Zinc Analytical Parameter Methane Sulfate Sulfide Dissolved Organic Suspended (as N) Solids Carbon Solids DIS TOT DIS TOT TOT DIS TOT DIS TOT DIS TOT DIS TOT TOT DIS TOT TOT DIS TOT DIS TOT DIS TOT DIS TOT Reporting Units ug/I ug/I ug/I ug/I mg/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I ug/I mg-N/L mg/I ug/I ug/I mg/I mg/I mg/I mg/I mg/I ug/I ug/I mg/I mg/I mg/I ug/I ug/I mg/I mg/I SSA NCAC 02L Standard NE 300 NE 15 NE NE 50 NE 1 NE NE NE NE 100 10 NE NE 20 NE NE NE 250 NE NE 0.2* Soo NE NE NE 0.3* NE 1 Sample ID Sample Analytical Results Collection Date ALLUVIAL MW-03�'� 03/19/2015 <10 34 <1 <1 8.83 827 880 <0.05 <0.05 <10 <1 <1 2.06 2.22 0.07 1.84 <1 <1 22 0.331 0.336 21 <2 <0.2 <0.2 190 0.875 <5 <0.3 <0.3 <0.005 <0.005 MW-16S�'� 06/23/2015 470 860 <1 <1 4.01 276 260 <0.05 <0.05 <10 1.23 1.24 1.63 1.57 0.144 2.06 <1 <1 11.2 0.111 0.109 5.3 <0.1 <0.2 <0.2 100 0.508 <5 <0.3 0.303 0.065 0.039 DETECTIONS/SAMPLES 1/2 2/2 0/2 0/2 2/2 2/2 2/2 0/2 0/2 0/2 1/2 1/2 2/2 2/2 2/2 2/2 0/2 0/2 2/2 2/2 2/2 2/2 0/2 0/2 0/2 2/2 2/2 0/2 0/2 1/2 1/2 1/2 AVERAGE ALLUVIAL WATER CONCENTRATION (DETECTIONS 470 447 --- --- 6.42 552 570 --- --- --- 1.23 1.24 1.85 1.90 0.107 1.95 --- --- 16.6 0.221 0.223 13.2 --- --- --- 145 0.692 --- --- 0.303 0.065 0.039 ONLY) MAXIMUM ALLUVIUM GROUNDWATER CONCENTRATION 470 860 --- --- 8.83 827 880 --- --- --- 1.23 1.24 2.06 2.22 0.144 2.06 --- --- 22.0 0.331 0.336 21.0 --- --- --- 190 0.875 --- --- 0.303 0.065 0.039 NUMBER OF ALLUVIUM GROUNDWATER SAMPLES 0 1 0 0 0 L 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 EXCEEDING 2L - Detections/Samples 3/5 10/10 0/5 0/10 10/10 5/5 10/10 0/5 2/10 0/5 4/5 4/10 3/5 3/5 4/7 SO/SO 0/5 0/10 10/10 5/5 5/5 10/10 0/5 0/5 1/10 10/10 5/5 7/10 4/5 7/10 5/10 8/10 Average Background Concentrations (Detections Only) 289 494 --- --- 7.65 499 295 --- 0.06 --- 5.95 5.88 1.69 2.35 0.44 3.4 --- --- 27.3 0.141 0.14 12.7 --- --- 0.323 231 1.1 9 1.16 2.51 0.018 0.025 Maximum Concentration 485 907 --- --- 15.5 954 894 --- 0.06 --- 14.6 14 1.91 3.09 1 8.66 --- --- 50.3 0.225 0.21 83 --- --- 0.323 380 2 17 2.39 5.88 0.056 0.067 Number of Backgroundwater Samples that are Greater Than 0 8 0 0 0 0 8 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 7 0 0 NCAC 2L Coal Ash COPC North Carolina groundwater 2L Alluvium groundwater conc. > 2L Alluvium Water COPC Yes No No No No Yes No No No No No No No No No No No No No No No No No Yes Yes No No No Yes No No Yes Yes Yes Yes Yes 4No Yes Yes No No Yes No Yes No No No No Yes No No No No No No No No No No No No No No No No No No No No No No Yes No No Notes - Bold highlighted concentration indicates exceedance of the 15A NCAC 02L Appendix 2, April 1, 2013. v_ - Indicates support/rationale for soil COPC attributable to coal ash. Note 1: If analytical method detection limit or concentration exceeds soil RSL u - Indicates constituent is not a soil COPC attributable to coal ash. Note 2: If no 15A NCNA 2L Standard ORP = Oxidation Reduction Potential DIS = Dissolved TOT = Total Temp = Temperature mV = millivolts Note 3: Hexavalent Chromium concentration is less than EPA screening value for tapwater (0.035 mg/Q. See Table 10-3 (USEPA Regional Screening Levels [RSLs] rev., June 26. 2015). NE = Not established Note 4: Hexavalent Chromium concentration is greater than EPA screening value for tapwater (0.035 ug/L). See Table 10-3 (USEPA Regional Screening Levels [RSLs] rev., June 26, 2015). NTU = nephelometric turbidity unit S.U. = Standard Unit DO = Dissolved Oxygen ug/I = microgram per liter Deg C = Degree Celsius umhos/cm = micro siemens per centimeter mg/I = milligrams per liter Spec Cord = Specific Conductance mg-N/L = miligram nitrogen per liter ft = feet --- = Not applicable < = concentration not detected at or above the reporting limit. * - Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Appendix 1, April, 1, 2013. Prepared by: KDF Checked by: VTV P:\Duke Energy Progress. 1026\105. Mayo Ash Basin GW Assessment Plan\1.11 CSA Reporting\Tables\Draft Tables\Table 12-4 Alluvial GW Results.xlsx Page 2 of 2