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COLORADO DEP.~IRT:SENT OF HEALTH <br />We ter Quality Control Division <br />Rationale - Page 9 <br />Permit No.: CO-0038776 <br />The proposed stream standards generally <br />have not been exceeded in the above daCa <br />in Table 3. <br />In Table 4, show below, are the <br />proposed scream standards for Segment 2 <br />of the North Fork of the Gunnison River. <br />TABLE 4 <br />PROPOSED NU`SERIC STANDARDS FOR SEGMENT 2 OF NORTH FORK <br />OF THE GUNNISON RIVER <br />• <br />Parameter/Concentration <br />D.O. = 6.0 mg/1 7.0 mg/1 spawiag <br />pH ~ 6.5 - 9.0 <br />Fecal Coliforms = 200/100 ml <br />NH3 0.02, unionized <br />Residual C12 = 0.003 <br />Cyanide (free) .005 <br />S as H25 ~ 0.002 undis. <br />Boron = 0.75 <br />Nierite ~ (N02) 0.05 <br />Nitrate = (NOg) = 10.0 <br />Chloride (C1) 250.0 <br />Sulfate (504) = 250.0 <br />Parameter/Concentration <br />Arseaic'(As) ~ 0.05 <br />Cadmium (Cd) = 0.0035 <br />Chromium (tri) ~ 0.1 <br />Chromium (hex) ~ 0.025 <br />Copper (Cu) ~ 0.006 <br />Lead (Pb) ~ 0.012 <br />Iron (Fe, sol) ~ 0.3 <br />Manganese (Mn, sol) _ .OS <br />Mercury (Hg) = 0.00005 <br />Nickel (Ni) ~ 0.05 <br />Selenium (Se) = 0.01 <br />Silver (Ag) 0.0001 <br />Zinc (Zn) = 0.05 <br />Iron (Fe, tot) ~ 1.0 <br />Manganese (:in, tot) = 1.0 <br />Segment 2 includes the mainsCem of the <br />North Fork of the Gunnison Ri•+er from <br />the outlet of Paonia Reservoir to Che <br />bridge crossing Section 31, T 13 S, R 6 <br />W in Paonia, Colorado. <br />IV. EFFLUENT LIMITATIONS CRITERIA: <br />Sable 5 shoes a comparison of state <br />effluent standards (SES) applicable to <br />Che domestic discharge 007 and federal <br />Cechnology based effluent limitations <br />(NSPS'~)for Coal mines that are applicable <br />to discharge points 001, 002, 003, 004, <br />005, 006 and 008 is this permit. <br />`New Source Performance Standard as established under Title 40 CFR 434.45. <br /> <br />