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PART I Page ld of 19 Permit No. ~-0032115 A. TERMS AND COND1TIOtS 1. Effluent Limitations (continued) (c) Outfalls 002. 005. 009. 011. 013. 015 and 016 (cattinued) Acry discharge or increase in wlume of a discharge caused by precipitation within airy 24-hour period greater than the 10-year. 24-horn- event (or series of storms or scnwmelt of equivalent wlume) m1 comply with the following limitations subject to burden of proof requirements described in Part I.A.2. Effluent Parameter Disri+' oe Limitations 30-Day Av¢ Daily Max Flow, MGD Total Suspetded Solids, mg/1 Total Iron, ~/p Settleable Solids, mQ/¢ pH, s.u.(mintmen-mmtim m) (009, 011, 013, 015, 016) pH, s.u.(mintmm-maxim m) (002, 005) June - September October - May Oil a:d Grease, mg/Q Whole Effluent Taxlcity, Acute 2. Burden of Proof Requirements 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 IG~ > 100% The petmlttee has the burden of proof when seeking relief from total suspecded solids (155), total iron and/or settleable solids (SS) limitations. All discharges axe 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 nunff; thus as long as this is true, this relief is available. For outfalls 002, 009, 013, 015 aid 016, either surface ruroff 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 ruroff 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. Relief may be granted for each discharge occurrence only when necessary aid shall mt be granted when the permittee has control over the discharge. 'Lhe pexmittee should endeavor to meet the primary limitations wherever possible. The permittee will need to show that exceedence of the applicable limitations was caused by precipitation mid m other source and that the discharge was beygi,d their control. a) For rainfall, to waive TSS and total iron limitations, it is necessary to prove that discharge occurred within 48 hours after ma~c+++-able precipitation has stopped. In addition, to waive settleable solids limitations, it is necessary to prays that discharge occurred within 46 hours after precipitation greater than the 10-year, 24-hour event has stopped. b) For srownelt. to waive TSS aid total iron limitations, it is necessary to prove that discharge occurred within 48 hours after pocd inflow has stopped. In addition, to waive settleable solids limitations, it is necessary to prove that discharge occurred within 48 hours after pgnd inflow wlume greater than the 10-year, 24-hour event has stopped. Amendcrent 2 Issued 03/15/94 Effective 05/01/94 Amendment 3 Issued Effective See Part I.C. for Definitions.