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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 by <br />precipitation within any 24-hour period less than or equal to the <br />10-year 24-hour orecioitation event (or snowmelt of equivalent <br />volume] may comply with the following limitations subject co <br />burden of proof requirements described in Part I.B.l.d). <br />Effluent Parameter <br />Flow, MGD <br />pH, standard units (minimum-maximum) <br />Oil and Crease, mg/1 (No visible sheen) <br />Settleable Solids, ml/1 g/ <br />Teeal Dissolved Solids, mg/1 <br />(Colorado River Basin Only) <br />Total Phosphorus (as P), mg/1 <br />(Dillon Reservoir and Upper Bear Creek Drainages <br />Discharge Limitations <br />Maximum Concentration <br />Dailv Maximum <br />Report <br />6,5-9.0 <br />to e./ <br />0,5 <br />Report <br />Report <br />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 vrecioitation event (or snowmelt of equivalent volume) <br />ma comply with the following limitations subject to burdeu 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 between 6.5 and 9.0 s.u. J <br />Oil and grease shall not exceed 10 mg/i. J 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/1 - 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 to outfalls serving surface <br />areas which have been returned to the required contour and on <br />which revegetation (specifically, seeding or planting) work has <br />commenced. The permittee may request consideration for change <br />from active mining limitations to post-mining Limitations when <br />these conditions have been met. Each facility certification <br />shall state whether active mining or post-mining limitations <br />apply to each authorized outfall. <br />See Part I.B.4. for Footnotes <br />