2002-05-13_PERMIT FILE - C1981018

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• c) Effective during periods of precipitation greater than the 10-year, 24-hour event for this facility. Any discarge or increase in volume of a discharge caused by precipitation within any 24-hour period greater than the 10-year, 24-hour e•:ent (or series of storms or snowmelt of equivalent volume) cay comply with the following limitations instead of limitations of item a) and b) immediately preceedirg. Flow-(!iCD) - monitoring only per Part Z.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. • 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 in 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. Post-`fining Areas A. T ":S 4'dD CONDITIONS (Continued) Tnere 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 ^ot associated with active mining opera [ions. ?. ?eauirements for Effluent Limitation Compliance Determination PA.~T_ I Page 2a of 19 Permit No.: CO-0038024 Commencing at the time active mining has ceased and surface areas have been returaed to the required contour all applicable discharges shall be subject to limitations other than those specified in Part I.A.1. These post-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.A.7. for Footnotes Code: i - 8 Date: 9 - 84 AMENDED ~~~17- O cI ~„b„i~