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PARTI <br />Page No. 6 <br />Permit No. COG-850000 <br />B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS <br />1- Effluent Limitations <br />b. Post-Minin¢ Outfalls (continued) <br />POST-MINING ALTERNATE LIMITATIONS <br />Any dischazge or increase in the volume of a dischazge caused by precipitation within any 24-hour period <br />oreater than the 10-veaz. 24-hour orecioitation event (or snowmelt of equivalent volume) may comply with <br />the following limitations -- subject to burden of proof requirements described in Pan I.B.I.d). <br />Parameter <br />Limitation <br />Flow, MGD Report <br />Set[leable Solids, mf/P Repon <br />pH, s.u. 6.5-9.0 <br />Oil and Grease, mg/P !0 <br />Total Dissolved Solids, ms/f Repon <br />CO River Basin ONLY <br />Total Phosphonts (as P), mglf Repon <br />Dillon Reservoir and Upper Bear Creek Drainages ONLY <br />c. General Limitations -Active and Post-Minin? Outfalls <br />]) There shall be no dischage of sani[ary wastewaters from toilets or related facilities. <br />2) There shall be no discharge of floatins solids or visible roam in other than trace amounts. <br />3) Tbere shall be no land applica[ion of wastewater other than for dust conttol. <br />4) No chemicals shall be added to the discbaree unless specific approval is granted by the Division <br />d. Burden of Proof Requirements <br />The pertrSnet bas the burden of proof when requesting relief from total suspended solids (TSS), total iron <br />and/or senleable solids limitations. Relief steal] be granted only when necessary and shall no[ be granted <br />when the perminee has control over the discharge. The perminee should endeavor to meet the primary <br />]imitations whenever possible. The Division shall have final authoriry in determining whether relief is <br />granted. <br />1) For rainfall to waive TSS and [oral iron limitations, it is necessary to demonstrate that discharge <br />occurred within 48 hours after measurable precipitation has stopped. To waive se[tleable solids <br />limitatiotts, it is necessary to prove that discharge occurred within A8 hours after precipitation greater <br />than the 10-year, 24-hour event has sropped. <br />2) For snowmelt, to waive TSS and total iron ]imitations, it is necessary to demonstrate that discharge <br />occurred within 48 hours after pond inflow has stopped. To waive senleable solids ]imita[ions, it is <br />necessary to prove that dischazge occurred within 48 hours after pond inflow volume greacer than the <br />10-year, 24-hour event has stopped. <br />The Division shall determine the adequacy of proof. As pan of this determination, the Division shall <br />evaluate whether the petmiaee could have controlled the discharge in such a manner that primary limitations <br />could have been met. All manual dewateting of ponds that are equipped with automatic dewatering systems <br />must meet TSS and total iron limitations. If a pond has only manual dewatering capability, relief is <br />available only [o the extent reouired to regain necessary srabiliry and capacity. <br /> <br /> <br />See Part I.C. for Definitions <br />