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Table 16 Proposed Groundwater Compliance Standards <br /> Colowyo Mine, Meeker, Colorado <br />Parameter Units <br />Proposed <br />Compliance <br />Standard Standard Source <br />Arsenic mg/L 0.01 Reg. 41 Human Health Standard <br />Field pH s.u. 6.5 - 8.5 Reg. 41 Drinking Water Standard <br />Iron mg/L 0.3 Reg. 41 Drinking Water Standard <br />Manganese mg/L 0.75 Pre-1994 Data Background UTL <br />Mercury mg/L 0.002 Reg. 41 Human Health Standard <br />Nitrate (as N) mg/L 10.0 Reg. 41 Human Health Standard <br />Nitrate+Nitrite (as N) mg/L 10.0 Reg. 41 Human Health Standard <br />Nitrite (as N) mg/L 1.0 Reg. 41 Human Health Standard <br />Selenium mg/L 0.02 Reg. 41 Agricultural Standard <br />Sulfate mg/L 997 Pre-1994 Data Background UTL <br />Total Dissolved Solids mg/L 1,840 Pre-1994 Data Background UTL <br />Zinc mg/L 2 Reg. 41 Agricultural Standard <br />Notes: <br />mg/L = milligrams per liter <br />s.u. = standard units <br />UTL = upper tolerance limit <br />Bold values represent upper tolerance limits calculated using pre-1994 baseline data from <br />Gossard Well and NGSW. <br />Page 1 of 1