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PART I Page No. 6 Perini[ No. COG-850000 B. EFFLUENT LIIt-II'1'ATIONS AND MONITORING REQUIREMENTS I. Effluent Limitations b. Post-Minine Outfalls (continued) -' POST-MINING ALTERNATE LIMITATIONS Any dischazge or increase in the volume of a discharge caused by precipitation within any 24-hour period Rreater than the 10-veaz. 24-hour orecioitation event (or snowmelt of equivalent volume) ~ comply with the following limitations -subject to burden of proof requirements described in Pan I.B.I.d). Part[mUer Limitation Flow, MGD Report Settleable solids, mP/P Report pH, s.u. 6.5-9.0 Oil and Grease, mg/P ]0 Total Dissolved Solids, mglP Report CO River Basin ONLY Tots( Phosphorus (as P), mglP Report Dillon Reservoir and Upper Beaz Creek Drainages ONLY c. General Limitations -Active and Post-Minin¢ Outfalls 1) There shall be no discharge of sanitary wastewaters from toilets or related facilities. 2) There shall be no discharge of floating solids or visible foam in other than tray amounts. 3) There shall be no land application of wastewater other than for dust control. 4) No chemicals shall be added to the discharge unless specific approval is granted by the Division d. Burden of Proof Requirements The pertnittee has the burden of proof whrn requesting relief from total suspended solids (TSS), total iron and/or settleable solids limitations. Relief shall be granted only when necessary and shall not be granted when the permittee has wntml over the discharge. The permittee should endeavor to meet the primary limitations whenever possible. The Division shall have final authority in determining whether relief is granted. 1) For rainfall. to waive TSS and total iron limitations, it is necessary to demonstrate that dischazge occurred within 48 hours after measurable precipitation has slopped. 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 even[ has stopped. 2) For snowmelt, to waive TSS and total iron limitations, it is necessary to demonstrate that dischazge occurred within 48 hour's after pond inflow has stopped. 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 even[ has stopped. The Division shall determine the adequacy of proof. As part of this determination, the Division shall evaluate whether the permittee could have controlled the discharge in such a manner that primary limitations could have been mu. All manual dewatering of ponds that are equipped with automatic dewa[ering systems mtut meet TSS and total iron limitations. If a pond has only manual dewatering capability, relief is available only to the extent required to regain necessary stability and capacity. See Part I.C. for Definitions