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PART 1 <br /> Page lb of 19 <br /> Permit No. CO-0000213 <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. (Continued) <br /> Effluent Parameter Discharge Limitations <br /> Maximum Concentration <br /> Dail • Maximum c/ <br /> Flow-(MGD) N/A <br /> Settleable Solids (ml/1) 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/l c/ in any grab sample nor shall there <br /> 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 event (or series of storms or snowmelt of equivalent <br /> volume) may comply with the following limitations instead of <br /> limitations of item a) and b) immediately preceeding. <br /> Flow-(MGD) - monitoring only, per Part I.B.I. <br /> Salinity - monitoring only, per Part I.B.l. <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 /> 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.C. for Footnotes <br /> Code: i - 8 Date: 1 - 84 <br /> 7-6-4 <br />