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PART I Page No. 6 Permit No. COG-850000 '. EFFLUENT LIlVIITATIONS AND MONITORING REQUIRIIVIENTS 1. Effluent Limitations b. Past-Minine Outfalls (continued) POST-MINING ALTERNATE LIL~IITATIONS Any dischazge or increase is the volume of a dischazge caused by precipitation within any 24-hour period greater than the l0-veaz. 24-hour orecioitation event (or mowmelt 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, mPlf Report pH, s.u. 6.5-9.0 Oil and Grease, mg/f 10 Tonal Dissolved Solids, mg/P Report CO River Basin ONLY Total Phosphorus (as P), mg/P Report Dillon Reservoir and UUpper Beaz Creek Drainages ONLY c. General Limitations -Active and Post-Minine Outfalls 1) There shall be no discharge of sanitary wastcwazers from toilets or related facilities. 2) There shall be no dischazge of floating solids or visible foam is other than trace amounts. 3) There shall be no land application of wastewater other than for dust watrol. 4) No chemicals shall be added to the discharge unless specific approval is granted by the Division d. Burden of Proof Reauiremenrs The petmittee has the btrrdrn of proof when ttxluesting relief from [oral suspended solids (CSS), total iron and/or sealeable solids limitations. Relief shall be granted only when necessary and shall not be granted whrn the petmittee has comrol over the dischazge. The petmittee should endeavor to [nett the primary limitations whenever possible. The Division shall have final authoriry in det~rmtning whether relief is granted. 1) For rainfall ro waive TSS and total iron limitations, it is necessary to demoastra[e that disrharge occurred within 48 bouts after ttteativrable precipitation has stopped. io waive seNeable solids limitations, it is necessary to prove thaz discharge occurred within 48 hours after precipitation greater than the 10-year, 24-hour evem has stopped. 2) For mowmelt, to waive TSS and mtal iron limitations, it is necessary to demonstra[e that discharge occurred within 48 hoots afer pond inflow has stopped. To waive settleable solids limitations, it is aecessazy to prove that dischazge 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 duettrtiaation, the Division shall evaluate whether the perrttittee could have controlled the discharge is mc6 a +++~*+++'* that primary limitations could have bern rnet. All manual dewazeting of ponds that are equipped with automatic dewatering systemr must meet TSS and total iron limitations. If a pond has only trtanual dewatering capability, relief is available only to the extent required to regain naessary stability and capacity. See Part I.C. Cor Deflaitioos