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PART I Page No. 6 Perini[ No. COG-850000 B. EFFLUENT LIl1-IITATIONS AND MONITORING REQUIItEMENTS 1. Effluent Limitations b. Post-Minin¢ Outfalls (continued) POST-MINING ALTERNATE LIMITATIONS Any dischazge or increase in the volume of a dischazge caused by precipitation within any 24-hour period Qreater than the 10-veaz. 24-hour orecioitation event (or snowmel[ of equivalent volume) may comply with the following limitations -- subject to burden of proof requirements described in Pan I.B.I.d). Parameter Limitation Flow, MGD Repon Settleable Solids, mP/P Report pH, s.u. 6.5-9.0 Oil and Grease, mg/P 10 Total Dissolved Solids, mg/P Report CO River Basin ONLY Total Phosphorus (as P), mglP Dillon Reservoir and C pper Beaz Creek Drainages ONLY Report c. General Limitations -Active and Post-Mining Outfalls 1) There shall be no dischazge of sanitary wastewaters from toilets or related facilities. 2) There shall be no dischazge of floating solids or visible foam in other than trace amounts. 3) There shall be no land application of wastewater other than for dust control. 4) No chemicals shall be added to the dischazge unless specific approval is granted by the Division d. Burden of Proof Requirements The permittce has the burden of proof when 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 control over the dischazge. The perminee should endeavor to meet the primary limitations whenever possible. The Division shall have final authority in determining whether relief is granted. 1) For rainfall, [o waive TSS and total iron limitations, it is necessary to demonstrate that dischazge occurred within 48 hours after measurable precipitation has stopped. To waive settleable solids limitations, it is necessary to prove that dischazge occurred within 48 hours after precipitation greater than the (0-yeaz, 24-hour event has stopped. 2) For snowmel[, to waive TSS and total iron limitations, it is necessary to demonstrate [ha[ dischazge occurred within 48 bolus abet pond inflow has stopped. To waive settleable solids limitations, it is necessary to prove that dischazge occurred within 48 hours afrer pond inflow volume greater than the 10-yeaz, 24-hour event has slopped. The Division shall determine the adequary of proof. As part of this determination, the Division shall evaluate whether the pertni[[ee could have controlled the dischazge in such a manner that primary limitations could have been met. All manual dewatering of ponds that are equipped with automatic dewatering systems must meet TSS and total iron limitations. If a pond has only tnanual dewatering capability, relief is available only to the extent required to regain necessary stability and capacity. See Part I.C. for Definitions