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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 11. Permit No. CO-0042161 <br />APPENDIX A <br />Water Quality Standards for Fish Creek <br />Physical and Biological <br />Dissolved Oxygen <br />pH <br />Fecal Coliform <br />Bacteria <br />Inorganic <br />= 6.0 mg/1 (minimum), 7.0 mg/1 spawning <br />= 6.5 - 9.0 s.u. <br />= 200 org/100 ml <br />Ammonia as N (NH3) <br />Residual C12 <br />Cyanide (free) <br />Sulfide as H25 <br />Boron <br />Nitrite as N (N02) <br />Metals <br />Arsenic (As) <br />Cadmium (Cd) <br />Chromium (Cr, tri) <br />Chromium (Cr, hex) <br />Copper, T.R. (Cu) <br />Lead (Pb) <br />Iron (Fe) <br />Manganese (Mn) <br />Mercury (Hg) <br />Nickel (Ni) <br />Selenium (Se) <br />Silver (Ag) <br />Zinc (Zn) <br />= 0.02 mg/1 <br />= 0.003 mg/1 <br />= 0.005 mg/1 <br />= 0.002 mg/1 <br />= 0.75 mg/1 <br />= 0.05 mg/1 <br />(unionized)* <br />(uadissociated) <br />= 0.05 mg/1 <br />= 0.001 mg/1 <br />= 0.1 mg/1 <br />= 0.025 mg/1 <br />= 0.022 mg/1 <br />= 0.025 mg/1 <br />= 1.0 mg/1 <br />= 1.0 mg/1 <br />= 0.00005 mg/1 <br />= 0.1 mg/1 <br />= 0.02 mg/1 <br />= 0.0001 mg/1 <br />= 0.05 mg/1 <br />*This would allow an instream concentration of 0.42 mg/1 total <br />ammonia, given a pH of 8.3 and a temperature of 20oC, as listed <br />in Appendix B, page 12. <br />• <br />I <br />LJ <br />• <br />