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PART I <br />Page No. 10 <br />Permit No.: CO-0000221 <br />pH, s.u. (minimum-maximum) <br />Oil and Grease, mg/I <br />Total Dissolved Solids, mg11 <br />Total Recoverable Iron, ug/I <br />Until 5/31/11 <br />Beginning 6/1/11 <br />Potentially Dissolved Selenium, ug/I <br />until 12/31/15 <br />beginning 1/1/16 <br />Settleable Solids, ml/l <br />NA NA 6.5-9 <br />NA NA 10 <br />Report NA Report <br />Report Report <br />1,000 NA Report <br />Report Report <br />4.6 NA 18 <br />Report NA 0.5 <br />ALTERNATE LIMITATIONS <br />Any discharge or increase in the volume of a discharge caused by precipitation within any 24-hour period less than or equal <br />to the 10-year, 24- precipitation event (or snowmelt of equivalent volume) may comply with the following limitations <br />subject to burden of proof requirements described in Part I.A.3. <br />Effluent Parameter <br />Flow, MGD <br />pH, s.u. (minimum-maximum) <br />Oil and Grease, mg/I <br />Total Dissolved Solids, mg/I <br />Total Recoverable Iron, ug/I <br />Until 5/31/11 <br />Beginning 6/1/11 <br />Potentially Dissolved Selenium, ug/I <br />until 12/31/15 <br />beginning 1/1/16 <br />Settleable Solids, ml/l <br />Effluent Limitations <br />Maximum Concentrations <br />30-Day Averaee 7-Day Average Daily Maximum <br />Report NA Report <br />NA NA 6.5-9 <br />NA NA 10 <br />Report NA Report <br />Report Report <br />1,000 NA Report <br />Report Report <br />4.6 NA 18 <br />Report NA 0.5 <br />ALTERNATE LIMITATIONS <br />Any discharge or increase in volume of a discharge caused by precipitation within any 24-hour period greater than the 10- <br />year, event (or series of storms or snowmelt of equivalent volume) may comply with the following limitations <br />subject to burden of proof requirements described in Part I.A.3. <br />Effluent Parameter <br />Flow, MGD <br />pH, s.u. (minimum-maximum) <br />Oil and Grease, mg/1 <br />Total Dissolved Solids, mg11 <br />Total Recoverable Iron, ug/1 <br />Until 5/31/11 <br />Beginning 6/1/11 <br />Potentially Dissolved Selenium, ug/I <br />until 12/31/15 <br />beginning 1/1/16 <br />Settleable Solids, ml/I <br />Effluent Limitations <br />Maximum _ Concentrations <br />30-Day Average 7-Day Averaee Daily Maximum <br />Report NA Report <br />NA NA 6.5-9 <br />NA NA 10 <br />Report NA Report <br />Report Report <br />1,000 NA Report <br />Report Report <br />4.6 NA 18 <br />Report NA Report <br />• <br />0 <br />C