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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division Rationale - Page 10. Permit No. CO-0027154 VI. TERMS AND CONDITIONS OF PERMIT A. Effluent Limitations Table VI-1 -- Effluent Limitations For Outfall 001 (continued) Parameter Limitation Rationale Total Recoverable Manganese, mg/1 Report ~/ Water Quality Standards Potentially Dissolved Copper, mg/1 0.073/0.130 e/ Water Quality Standards Potentially Dissolved Silver, mg/1 Report Water Quality Standards pH, s.u. 6.5 - 9.0 J Water Quality Standards Oil and Grease, mg/1 10 J State Effluent Regulations Electrical Conductivity, umho/cm 6,485 J Beneficial Use Whole Effluent Toxicity, Acute through March 31, 1996 Report WET Regulations beginning April 1, 1996 IWC-100X/SOX e/ WET Regulations Whole Effluent Toxicity, Chronic through June 30, 1996 Report WET Regulations * See discussion regarding alt ernate limitation burden of proof J 30-Day Average/Daily Maximum J 30-Day Average J Daily Maximum Minimum-Maximum e/ There shall be no acute toxicity in the ef fluent from this discharge point. The acute toxicity limitation is exceeded if 1) a stati stically significant difference in mortality (at the 95X confidence level) is observed for either species between the control and any dilution less that or equal to the identified IWC or 2) a species mortality in any dilution of effluent (in cluding 100X affluent) exceeds 50X. Table VI-2 -- Effluent Limitations For Outfall 005 Parameter Limitation Rationale Flow, MGD Report J Design Capacity TSS, mg/1 35/70* g/ Federal BPT Total Recoverable Iron, mg/1 1.0 ~ Water Quality Standards Total Recoverable Manganese, mg/1 Report ~ Water Quality Standards Potentially Dissolved Copper, mg/1 0.073/0.130 ~/ Water Quality Standards Potentially Dissolved Silver, mg/1 0.003/0.079 g/ Water Quality Standards pH, s.u. 6.5 - 9.0 J Water Quality Standards 011 and Grease, mg/1 10 J State Effluent Regulations Electrical Conductivity, umho/cm 5,340** J Beneficial Use Whole Effluent Toxicity, Acute through March 31, 1996 Report WET Regulations beginning April 1, 1996 IWC-100X/SOX e/ WET Regulations Whole Effluent Toxicity, Chronic .- through June 30, 1996 Report WET Regulations