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PART I <br />Page 4 <br />Permit No. COG-350000 <br />. B. 'eFFLUENT LIMITATIONS ?uVD MONITORING REQUIREM&`1T5 <br />1. Effluent Limitations (continued) <br />a) Active Mining Outfall(s) (continued) <br />ALTERNATE LIMITATIONS <br />Any discharge ar increase in the volume of a discharge caused by <br />przcipicacion within any 24-hour period Less than or equal to *_he <br />10-year. 24-hour orecinicacion event (or snowmelc of equivalanc <br />volume) may comply with the fol'_oving limitations subject co <br />burden of proof requirements described in Part I.B.1.d). <br />Effluent Parameter Discaar~e Limitations <br />Maximum Concentration <br />Daily *ta-~cimum <br />flow, MGD Report <br />pH, stanaard units (minimum-maximum) 6.5-9.0 <br />OiI and Grzas~:, mg/1 (No visible sheen) 10 <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/i Report <br />• (Dillon Reservoir and Upper Bear Creek Drainages Or.1y) <br />Any discharge or increase in the volume o£ a discharge caused by <br />precipitation within any 24-hour period g, eater than the 10-year. <br />?~4-hour vrecioication event (or snovmelt of equivalent volume) <br />may comply with the following limitations subject to burden of <br />proof requirements describd in Part I.B. 1, d). <br />F1ov, MGD - monitoring only per Part I.B.2.a) <br />pH shall rzmain bet-+een 6.5 and 9.0 s.u. <br />Oii and grease shall not exceed 10 mg/1. ~ ~ <br />To cal Dissolved Solids, mg/1 - monitoring only per Part i.3.~.a) <br />(Colorado River Basin Oniy) <br />Toca1 Phosphorus (as P), ag/i - monitoring only oer Part i.B.2.a) <br />(Dillon Reservoir and Upper Bear Creek Drainages Only) <br />b) ?osc-Mining Outfall(s) <br />Post-mining Limitations say apply co outfalls se wing surface <br />arias which have been recirned to tae revuired contour and on <br />which revegecacion (SDeC~f:C311y, seeding or pLanc:ng) vorx was <br />commenced. The permittee may request consideration for charge <br />[ram ac_::e sizing Limitations to post-mining Limitations •Jhen <br />these ^_onditions have Seen met. °_aci7 facilit-r certification <br />. shall stale whecaer acti-:e wining or oosc-mining _imicat:ons <br />anoLy to Baca au cro r:'ea. ~~u [tail. <br />Sae ?art ..3.'.. :or ?oucnocas <br />