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PART I <br />Page 4 <br />Permit No. COG-850000 <br />B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS <br />1. Effluent Limitations (continued) <br />a) Active Mining Outfall(s) (continued) <br />ALTERNATE LIMITATIONS <br />Any discharge or increase in the volume of a discharge caused Sy <br />precipitation within any 24-hour period lass than or equal to the <br />10-vear. 24-hour orecioitation event (or snowmelc of equivalent <br />volume) may comely with the following limitations subject to <br />burden of proof requirements described in Part I.B.1.d). <br />Effluent Parameter <br />Flow, MGD <br />pH, standard units (minimum-maximum) <br />Oil and Grease, mg/1 (No visible sheen) <br />Settleable Solids, m1/1 g,/ <br />T_ecal Dissolved Solids, mg/1 <br />(Colorado River Basin Only) <br />Discharge Limitations <br />Maximum Concentration <br />Daily Maximum <br />Report <br />6.5-9.0 <br />to J <br />0.5 <br />Report <br />Toca1 Phosphorus (as P), mg/i Report <br />(Dillon Reservoir and Upper Bear Creek Drainages Orly) <br />Any discharge or increase in the volume of a discharge caused by <br />precipitation within any 24-hour period greater than the 10-vear. <br />24-hour orecipitation event (or snowmelt of equivalent volume) <br />ma comply with the following limitations subject to burdeei of <br />proof requirements describd in Part I.B.l.d). <br />Flow, MGD - monitoring only per Part I.B.2.a) <br />pH shall remain bec.~een 6.5 and 9.0 s.u. <br />Oil and grease shall not exceed 10 mg/1. ~ J <br />Total Dissolved Solids, mg/1 - monitoring only per Part I.B.2.a) <br />(Colorado River Basin Only) <br />Total Phosphorus (as P), mg/L - monitoring only per Part I.B.2.a) <br />(Dillon Reservoir and Upper Bear Creek Drainages Only) <br />b) Posr.-Mining Outfall(s) <br />Post-mining limitations may apply co outfalls serving surface <br />areas which have been returned co the required contour and on <br />which revegetacion (specifically, seeding or planting) work nas <br />commenced, The permittee may request consideration for change <br />from active mining limitations co post-mining limitations when <br />these conditions have been met. Each facility certification <br />shall state whether act_~e mining or oosc-mining limitations <br />aonly to •aach authorized nucfall. <br />Sae Part I.3.~. °or ?oo cno ces <br />