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PART I Page lc of 14 Permit No. CO-0027154 A. TERMS AND CONDITIONS 1. Effluent Limitations b) Effluent Limitations For Outfalls 005 and 007 (normally continuous discharges from active mining areas) i) Outfall 005 Effluent Parameter Discharge Limitation 30-Dax Avg,, ~ Daily Max. Flow, MGD Total Suspended Solids, mg/1 Total Recoverable Iron, mg/1 Total Recoverable Manganese, mg/1 Potentially Dissolved Copper, mg/1 n/ Potentially Dissolved Silver, mg/1 pM, standard units (minimum-maximum) Oil and Grease, mg/1 (No visible sheen) Electrical Conductivity, umho/cm WET, Chronic Lethality Through March 31, 1996 Beginning April 1, 1996 Report Report 35 70 1.0 Report Report Report 0.073 0.130 0.003 0.079 N/A 6.5-9.0 N/A 10 5340 Report N/A ReporC N/A See Part I.A.l.f) ALTERNATE LIMITATIONS Any discharge or increase in the volume of a discharge caused by precipitation within any 24-hour period less than or equal to the 10-year. 24-hour orecioitation event (or snowmelt of equivalent volume) may comply with the following limitations subject to burden of proof requirements described in Part I.A.2. Effluent Parameter Discharge Limitation 30-Dam Ave. ~ Daily Max. Flow, MGD Report Report Settleable Solids, ml/1 jJJ Report 0.5 Total Recoverable Iron, mg/1 1.0 Report Total Recoverable Manganese, mg/1 Report Report Potentially Dissolved Copper, mg/1 n/ 0.073 0.130 Potentially Dissolved Silver, mg/1 n/ Report Report pM, standard units (minimum-maximum) N/A 6.5-9.0 Oil and Grease, mg/1 (No visible sheen) N/A 10 Electrical Conductivity, umhoJcm 5340 Report WET, Chronic Lethality Through March 31, 1996 N/A Report Beginning April 1, 1996 N/A See Part I.A.l.f) See Part I.D. for Footnotes Amendment No. 2 Issued Effective