2011-10-24_PERMIT FILE - C1983059

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PARTI Page No. 5 Permit No. COG-850000 B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS 1. Effluent Limitations b. Post-Minine Outfalls Post-mining limitations may apply to ouffalis serving surface azeas, which have been returned to the required contour and on which revegetation (specifically, seeding or planting) work has commenced. The permittee may request consideration for change from active mining limitations to post-mining limitations when these conditions have been met. POST-MINING PRIMARY LIMITATIONS Parameter Limitation Flow, MGD Report •Settleable Solids, mUl 0.5 pH, s.u. 6.5-9.0 Oil and Grease, mg/t 10 Total Dissolved Solids, mg/I•• Report Total Phosphorus (as P), mg/1••• Report POST-MINING ALTERNATE LIMITATIONS Any dischazge or increase in the volume of a discharge caused by precipitation within any 24-hour period erecter than the 10-vear. 24-hour erecipitation event (or snowmel[ of equivalent volume) >~ comply with the following limitations -- subject to burden of proof requirements described in Part I.B.I.d). Parameter Limitation Flow, MGD Report •Settleable Solids, mUl Report pH, s.u. 6.5-9.0 Oil and Grease, mg/1 10 Total Dissolved Solids, mg/1•• Report Total Phosphorus (as P), mg/1••• Report "If dischazge is to land, 7SS and settleable solids monitoring is waved. ''Applies only to drainages within the Colorado River Basin '''Applies only to drainages directly above Chatfield Reservoir, Cheny Creek Reservoir, Dillon Reservoir, or Upper Bear Creek. c. General Limitations -Active and Post-Minine Outfalls 1) There shall be no dischazge of sanitary wastewaters from toilets or related facilities. 2) There shall be no discharge 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 discharge unless the Division grants specific approval d. Burden of Proof Requirements The permittee has the burden of proof when requesting relief from total suspended solids (TSS), totaluon, total manganese, and/or settleable solids limitations. Relief shall be granted only when necessary and shall not be granted when the permittee has control over the discharge. The pemrittee should endeavor [o meet the primary limitations whenever possible. The Division shall have final authority in determining whether relief is granted. 1) For rainfall, to waive TSS, total 'iron, and total manganese 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 10-yeaz, 24-hour event has stopped. 2) For snowmelt, [o waive TSS, total 'von, and total manganese limitations, it is necessary to demonstrate that dischazge occurred within 48 hours 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.yeaz, 24-hour event has stopped. The Division shall determine the adequacy of proof. As part of this determination, the Division shall evaluate whether the pemrittee could have controlled the discharge in such a manner that primary limitations could have been met. All manual dewatering ofponds that aze equipped with automatic dewa[ering systems must meet TSS, total iron, and total manganese limitations. If a pond has otily manual dewatering capability, relief is available only ro the extent required to regain necessary stability and capacity. See Part I.C. for Defutitions