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PART I Page Ld of 19 Permit No. CO-0032115 A. TERMS AND CONDITIONS 1. Effluent Limitations (continued) (c) Outfalls 002 005. 009. 011. 013 and 015 (continued) Any discharge or increase in volume of a discharge caused by precipitation within any 24-hour period greater than the 10-year. 24-hour event (or series of storms 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 Flow, MGD Total Suspended Solids, mg/P Total Iron, mg/P Settleable Solids, mR/P pH, s.u. (minimum-maximum) (009, 011, 013, O15) pH, s.u. (minimum-maximum) (002, 005) June - September Oc[ober - May Oil and Crease, mg/P Whole Effluent Toxicity, Acute 2. Burden of Proof Requirements Discharge Limitations 30-Dav Ave Daily Max Report Report Report Report Report Report N/A Report N/A 6.5-9.0 N/A 6.5-9.5 N/A 6.5-9.0 N/A 10 N/A LCso > 100X The permittee has the burden of proof when seeking relief from total suspended solids (TSS), total iron and/or settleable solids (SS) limitations. All discharges are eligible for this relief providing the exceedence of effluent limitations is the result of precipitation. For outfalls 001, 003, 006, 008, 010, 012 and 014, the total discharges must consist of surface runoff; thus as long as this is true, this relief is available. For outfalls 002, 009, 013 and 015, either surface runoff or mine water (or both) may be discharged, for outfall 005, either surface runoff or spoils spring water (or both) may be discharged, for outfall 011, either surface runoff or mine water or spoils spring water (or all three) may be discharged. For this relief to be available for these six outfalls, the majority of the discharge must be surface runoff. RP1ief may be granted for each discharge occurrence only when necessary and shall not be granted when the permittee has control over the discharge. The permittee should endeavor co meet the primary limitations whenever possible. The permittee will need to show that exceedence of the applicable limitations was caused by precipitation and no other source and that the discharge was beyond their control. a) For rainfall. to waive TSS and total iron limitations, it is necessary to prove that discharge occurred within 48 hours after measurable precipitation has stopped. In addition, to waive settleable solids limitations, it is necessary to prove that discharge occurred within 48 hours after precipitation greater than the 10-year, 24-hour event has stopped. b) For sno~umelt, to waive TSS and total iron limitations, it is necessary to prove that discharge occurred within 48 hours after pond inflow has stopped. In addition, to waive settleable solids limitations, it is necessary to prove that discharge occurred within 48 hours after pond inflow volume greater than the 10-year, 24-hour event has stopped. Amendment 2 Issued Effective See Part I.C. for. Definitions.