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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 precipitation event (or snowmelt of equivalent <br />volume) mad! comply with the following limitations subject to <br />burden of proof requirements described in Part I.B.l.d). <br />Effluent Parameter Discharge Limitations <br />tiaximum Concentration <br />Daily Maximum <br />Flow, MGD Report <br />pH, standard units (minimum-maximum) 6.5-9.0 <br />011 and Grease, mg/1 (No visible sheen) 10 e/ <br />Settleable Solids, ml/1 g/ 0.5 <br />Total Dissolved Solids, mg/1 Report <br />(Colorado River Basin Only) <br />Total Phosphorus (as P), mg/1 Report <br />(Dillon Reservoir and Upper Bear Creek Drainages Only) <br />Any discharge or increase in the volume of a discharge caused by <br />precipitation within any 24-hour period greater than the 10 year. <br />24-hour precipitation event (or snowmelt of equivalent volume) <br />m~ comply with the following limitations subject to burden of <br />proof requirements describd in Part I.B.l.d). <br />Flow, MGB-- monitoring only per Part I.B.2.a) <br />pH shall remain between 6.5 and 9.0 s.u. <br />Oil and grease shall not exceed 10 mg/1. <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) Post-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 />