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PART I <br /> Page 4 of 20 <br /> Permit No.: CO-0000396 <br /> • A. TERMS AND CONDITIONS (Continued) <br /> Applicable to outfalls 001, 006, 007, 008, 009, 010, 013, 014, 015, 016, <br /> 017, 018, 020, 021, 022, .023, 024 and 025. <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.1. <br /> Salinity - monitoring only per Part I.B.1. <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 /> 2. Requirements for Effluent Limitation Compliance Determination <br /> The permittee shall have the burden of proof that a discharge was <br /> caused by a precipitation event in order to qualify for the alternate <br /> limitations in Part I.A.l.b or I.A.l.c. In the absence of satisfactory <br /> proof, the limitations in Part I.A.l.a shall prevail. Monitoring of <br /> all effluent parameters shall be required as per Part I.B.1, regardless <br /> of the cause of the discharge. <br /> 3. Post-Mining Areas <br /> Commencing at the time active mining has ceased and surface areas have <br /> been returned to the required contour all applicable discharges shall <br /> be subject to limitations other than those specified in Part I.A.1. <br /> These post-mining limitations shall remain in effect until bond <br /> release. The permittee shall notify the Division upon cessation of <br /> active mining so that appropriate permit modifications can be made. <br /> Amended 9/17/84 SAW <br /> Amended <br /> See Part I.C. for Footnotes <br /> Code: i - 8 Date: 9 - 84 <br /> Ii <br />