2018-11-05_PERMIT FILE - C1981044 (12)

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• PART I Page lb of 19 Permit Number: CO -0034142 A. TERMS AND CONDITIONS (Continued) 2. Post -Mining Effluent Limitations Beginning immediately and lasting through December 31, 1990 the permittee is authorized to discharge within the limitations specified below, from outfall(s) serial number(s) 004, OUb, U07, 009, 011, 012, 013, 014, 015, 016, 017, 018, 019, 020 and 021. a. Any discharge resulting from non -precipitation -related causes or from precipitation within any 24-hour period less than or equal to the 10 -year, 24-hour precipitation event (or snowmelt of equivalent volume) shall comply with the following limitations. Discharge Limitations Maximum Concentration Effluent Parameter Daily Max. c/ Flow -(MCD) N/A Settleable Solids (ml/1) 0.5 • Salinity N/A pH - (Standard Units) shall remain between 6.5 and 9.0 c/. 011 and grease shall not exceed 10 mg/1 c/ in any grab sample nor shall there be a visible sheen. b. Any discharge caused by precipitation within any 24-hour period greater than the 10 -year, 24-hour precipitation event (or saowmelt of equivalent volume) shall comply witn the following limitatious. Flow-HGD - monitoring only Salinity - monitoring only pH - (Standard Units) shall remain between b.5 and 9.0 c/ Oil'and grease shall not exceed 10 mg/l c/ in any grab sample nor shall there be a visible sheen. C. 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 surface runoff. d. These limitations shall apply to discharge from reclamation areas until the performance bond issued to the facility by the appropriate • SMCRA authority has been released and the Division approves inactivation of the discharge point. See Part I.C. for Footnotes