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PART I Page lb of 19 Permit No.: CO-0041033 • A. TERMS AND CONDITIONS (Continued) c) Effective during periods of precipitation greater than the 10-year, 24-hour event for this facility. Any discharge or increase in volume of a discharge caused by precipitation within any 24-hour period greater than the 10-year, 24-hour event (or series of storms or snowmelt of equivalent volume) may comply with the following limitations instead of limitations of item a) and b) immediately preceeding. Flow-(MGD) - monitoring only per Part I.B. 1. Salinity - monitoring only per Part I.B.1. pH - (Standard Units) shall remain between 6.5 and 9.0 c/. Oil and grease shall not exceed 10 mg/1 c/ in any grab sample nor shall there be a visible sheen. d) Additional conditions-effective at all times. There shall be no discharge of floating solids or visible foam in other than trace amounts. The discharge shall not contain any sanitary sewage or other pollutants not associated with active • mining operations. 2. Requirements for Effluent Limitation Compliance Determination The permittee shall have the burden of proof that a discharge was caused by a precipitation event in order to qualify for the alternate limitations is Part I.A.l.b or I.A.l.c. In the absence of satisfactory proof, the limitations in Part I.A.l.a shall prevail. Monitoring of all effluent parameters shall be required as per Part I.B.1, regardless of the cause of the discharge. 3. Pont-Mining Areas Commencing at the time active mining has ceased and surface areas have been returned to the required contour all applicable discharges shall be subject to limitations other than those specified in Part I.A.1. These poet-mining limitations shall remain in effect until bond release. The permittee shall notify the Division upon cessation of active mining so that appropriate permit modifications can be made. . See Part I.C. for Footnotes Code: i - 8 Date: 9 - 84