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Environmental Protection Plan, Schwartzwalder Mine 9-2 <br />• Table 9-1. Colorado Ground Water Standards for Inorganic Parameters, Coliform Bacteria, <br />and Radionuclides (') <br />Domestic Water Supply <br />Analytical Agricultural Radioactive <br />Basis Human Health Drinking Water Standard Material Standards <br />Standard Standard <br />Solution Parameters, Major Ions, and Nutrients <br />pH (s.u.) total 6.5-8.5 6.5-8.5 <br />Chloride (mg/1) diss. 250 <br />Fluoride (mg/1) diss. 4.0 2 <br />Sulfate (mg/1) diss. 250 <br />Nitrogen, nitrate (mg/1) diss. 10.0 <br />Nitrogen, nitrite (mg/1) dirs. 1.0 10 <br />Nitrogen, nitrate+nitrite (mg/1) diss. 10.0 100 <br />Cyanide, free (mg/1) free 0.2 <br />Metals <br />Aluminum (mg/1) diss. 5 <br />Antimony (mg/1) diss. 0.006 <br />Arsenic (mg/1) diss. 0.01 0.1 <br />Barium (mg/1) diss. 2.0 <br />Beryllium (mg/1) diss. 0.004 0.1 <br />Boron (mg/1) 0.75 <br />Cadmium (mg/1) diss. 0.005 0.01 <br />Chromium, trivalent + <br />diss. <br />0.1 <br />0.1 <br />hexavalent (mg/1) <br />Cobalt (mg/1) diss. 0.05 <br />Copper (mg/1) diss. 1 0.2 <br />Iron (mg/1) diss. 0.3 5 <br />Lead (mg/1) diss. 0.05 0.1 <br />• <br />Lithium (mg/1) diss. 2.5 <br />Manganese (mg/1) diss. 0.05 0.2 <br />Mercury, inorganic (mg/1) diss. 0.002 0.01 <br />Molybdenum (mg/1) diss. 0.035 <br />Nickel (mg/1) diss. 0.1 0.2 <br />Selenium (mg/1) diss. 0.05 0.02 <br />Silver diss. 0.05 <br />Thallium (mg/1) diss. 0.002 <br />Uranium (mg/1) diss. 0.03 0.03 <br />Vanadium (mg/1) diss. 0.1 <br />Zinc (mg/1) diss. 5 2 <br />Bacteriological <br />Total coliform bacteria <br />total (2) <br />(organisms/100 ml) <br />Americium total 0.15 <br />Cesium total 80 <br />Plutonium total 0.15 <br />Radium 226 and 228 total 5 <br />Strontium 90 total 8 <br />Thorium 230 and 232 total 60 <br />Tritium total 20,000 <br />Gross alpha (pCi/1) diss. 15 <br />Beta and photon emitters <br />diss. 4 <br />(mrem/yr) <br />TDS Standard <br />Background Water Quality Maximum Allowable TDS Concentration <br />0 to 500 mg/1 400 mg/1 or 1.25 times the background level, whichever is least restrictive <br />501 to 10,000 mg/1 1.25 times the background value <br />• <br />10,001 mg/1 or greater No limit <br />NOTES: (1) Basic Standards for Ground Water (CDPHE WQCC Regulation No 41,5 CCR 1002-41, effective November 30, 2009) <br />(2) Coliform Bacteria s tandard Max 30 days = 23 org/100 ml, 30-day average = 2.2 org/100 <br />4109C.100731 Whetstone Associates 6