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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 Oucfall(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 eoual 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.1.d). <br />Effluent Parameter Discharge Limitations <br />Maximum Concentration <br />Daily Maximum <br />Flow, MGD Report <br />pH, standard units (minimum-maximum) 6.5-9.0 <br />Oil and Grease, mg/1 (No visible sheen) 10 J <br />Settleable Solids, ml/1 g/ 0.5 <br />Teca1 Dissolved Solids, mg/1 Report <br />.(Colorado River Basin Only) <br />Total 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 orecioitation event (or snowmelt of equivalent volume) <br />may comply with the following Limitations subject to burden of <br />proof requirements describd in Part I.B.l.d), <br />Flow, MGD - monitoring only per Part I.8,2.a) <br />pH shall remain between 6,5 and 9.0 s.u. <br />Oil and grease shall not exceed 10 mg/1. J J <br />Total Dissolved Solids, mg/1 - monitoring only per Parc I.B.2.a) <br />(Colorado River Basin Only) <br />Total Phosphorus (as P), mg/1 - monitoring only per Parc I.B.2.a) <br />(Dillon Reservoir and Upper Bear Creek Drainages Only) <br />b) Posr.-Mining Outfall(s) <br />Post-mini,~g limitations may apply to outfalls serving surface <br />areas which have been returned [o [he 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 pose-mining limitations <br />apply to each authorized outfall. <br />See Part I.8.4, for Footnotes <br />