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Home My WebLink AboutTable 2 - Mayo BTV GW_20170804TABLE 2 GROUNDWATER BACKGROUND THRESHOLD VALUES MAYO STEAM ELECTRIC PLANT DUKE ENERGY PROGRESS, LLC, ROXBORO, NC Parameter Reporting Unit NCAC 02L Standard Background Threshold Values Surficialt Transition Zone Bedrock pH* S.U. 6.5-8.5 4.9-6.5 5.7-6.6 5.0-7.3 Alkalinity mg/L NE 13 302 223 Aluminum pg/L NE 566 489 551 Antimony pg/L 1° N D N D N D Arsenic pg/L 10 ND ND ND Barium pg/L 700 19 62 97 Beryllium pg/L 4° ND ND ND Bicarbonate mg/L NE 13 302 223 Boron pg/L 700 ND ND ND Cadmium pg/L 2 ND ND 1 Calcium mg/L NE 3 59 73 Carbonate mg/L NE ND ND ND Chloride mg/L 250 3 33 43 Chromium (VI) pg/L 10 0.1 1 0.3 Chromium pg/L 10 3 6 7 Cobalt pg/L 1° 1 ND 1 Copper pg/L 1000 2 ND 5 Iron pg/L 300 385 1301 3359 Lead pg/L 15 ND ND ND Magnesium mg/L NE 0.8 14 13 Manganese pg/L 50 253 297 544 Mercury pg/L 1 ND 0.2 ND Methane pg/L NE 12 2238 ND Molybdenum pg/L NE 3 ND 13 Nickel pg/L 100 3 5 5 Nitrate + Nitrite mg-N/L NE 0.8 0.3 1 Potassium mg/L NE 4 4 7 Selenium pg/L 20 ND ND ND Sodium mg/L NE 5 53 61 Strontium pg/L NE 25 391 418 Sulfate mg/L 250 2 8 18 Sulfide mg/L NE ND ND ND TDS mg/L 500 85 430 340 Thallium pg/L 0.2° ND ND ND TOC mg/L NE 2 2 1 Vanadium pg/L 0.3° 1 6 6 Zinc pg/L 1000 227 11 42 Radium (Total) pCi/L NE 4 9t 8 Uranium (Total) pg/mL NE 0.0004 0.001t 0.006 Prepared by: JHG / LWD Checked by: JAW / RKD Notes: Surficial (Saprolite) background wells: MW-12S Transition Zone background wells: BG-2 and MW-12D Bedrock background wells: BG-1, MW-13BR, and MW-14BR t - Indicates value is provisional; dataset contains less than 10 valid samples TDS - Total Dissolved Solids Radium (Total) - Radium-226 and Radium-228 combined Uranium (Total) - Uranium-233, Uranium-234, Uranium-236, and Uranium-238 combined S.U. - Standard Unit pg/L - micrograms per liter mg/L - milligrams per liter pCi/L - picocuries per liter pg/mL - micrograms per milliliter * - Upper and lower tolerance limits calculated for parameter A - Interim Maximum Allowable Concentrations (IMACs) of 15A NCAC .021- Standard, Appendix 1, April 1, 2013 ND - Not Detected NE - Not Established C:\Users\bjstrickland\AppData\Local\Temp\Table 2 - Mayo BTV GW_597492\Table 2 - Mayo BTV GW.xlsx Page 1 of 1