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PART I <br /> Page 3 of 20 <br /> Permit No.: CO-0000396 <br /> A. TERMS AND CONDITIONS (Continued) <br /> b) Effective during periods of precipitation less than or equal to the <br /> 10-year, 24-hour event for this facility. <br /> Any discharge or increase in 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) may comply with the following limitations instead of the <br /> limitations of item a) immediately preceeding or item c) <br /> immediately following. <br /> Effluent Parameter Discharge Limitations <br /> Maximum Concentration <br /> Daily Maximum c/ <br /> Flow (MGD) N/A <br /> Settleable Solids, ml/1 j/ 0.5 <br /> Salinity N/A <br /> pH - (Standard Units) shall remain between 6.5 and 9.0 c/. <br /> • Oil and grease shall not exceed 10 mg/1 c/ in any grab sample nor <br /> shall there be a visible sheen. <br /> c. Effective during periods of precipitation greater than the 10-year, <br /> 24-hour event for this facility. <br /> Any discharge or increase in 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) may <br /> comply with the following limitations instead of the limitations of <br /> item a) and b) immediately preceeding. <br /> Flow (MGD) - monitoring only per Part I.A.4.a.2) <br /> Salinity - monitoring only per Part I.A.4.a.2) <br /> pH - (Standard Units) shall remain between 6.5 and 9.0 c/. <br /> Oil and grease shall not exceed 10 mg/l c/ in any grab sample nor <br /> shall there be a visible sheen. <br /> d. Additional conditions - effective at all times. <br /> There shall be no discharge of floating solids or visible foam in <br /> other than trace amounts. The discharge shall not contain any <br /> sanitary sewage or other pollutants not associated with active <br /> mining operations. <br /> See Part I.A.5. for Footnotes <br /> Amended 9/17/84 <br /> Amended 4 26/85 <br /> Amended <br /> III <br />