2012-06-20_PERMIT FILE - C2010089 (57)

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4. Effluent Limitations — Post Mining Areas Post - mining limitations may apply to outfalls serving reclamation areas, which have been returned to the required contour and on which revegetation (specifically, seeding or planting) work has commenced. Limitations may also apply to 1'0St mining underground mine areas. The permittee may request consideration for change from active mining limitations to post - mining limitations when these conditions have been met: a. Post Mining Reclamation Areas - This category is subject to 40 CFR Part 434 Subpart E (Post Mining Areas). The following limitations apply to reclamation areas. The federal ELG limitations would apply until bond release. If these wastewaters are combined with other waters under Part I.B.1, then those limitations shall apply. If this wastewater is combined with post mining underground mine wastewater, then the limitations in Part I.B.3.b apply to the combined discharge. If this post mining wastewater is separate, then the following limitations apply. Flow, MGD pH, s.u. Total Suspended Solids, mg/1 Oil and Grease, mg/I Settleable Solids, m1/1 Total Dissolved Solids, mg/1* Total Phosphorus (as P), mg/1** Total Recoverable Iron, ug/1 Other Pollutants of Concern Whole Effluent Toxicity (WET) Chronic Acute Settleable Solids, ml/1 General Permit Requirements - -- Report NA Report Discharge Evaluation N/A NA 6.5 -9.0 30 45 NA N/A NA 10 Federal Effluent Limitation Guidelines Report NA 0.5 Federal ELG Site Specific Limitations Report Report 1000 Various NA NA NA NA Stat Diff and 1C25 > IWC LC50 > 100% Footnotes 1 - 4, * , ** , and * ** can be found under Pan I.B.1 and Part I.B.2. Report Various NA Various -- _----- ----- _— ..--- ---_-- _... -- -- Federal Effluent Limitation Guidelines Water Quality Standards State Effluent Regulations State Effluent Regulations Salinity Regulations Control Regulations Water Quality Standards Water Quality Standards State Permit Limitations State Permit Limitations Continuous / Instantaneous Weekly Weekly Weekly ALTERNATE LIMITATIONS FOR POST - MINING RECLAMATION AREAS Report NA Report Federal ELG Weekly PART 1 - • Page No. 7 Permit No. COG - 850000 Recorder / In -situ 2 Grab Grab Visual 3 Weekly Grab Quarterly 4 Grab Monthly Grab Weekly Grab Weekly Grab Quarterly 3 Grab/Test Grab Any discharge or increase in the volume of a discharge from a reclamation area, caused by precipitation within any 24 -hour period greater than the 10 -year. 24 -hour precipitation event (or snowmelt of equivalent volume) may substitute the following limitations for these specific parameters only, subject to burden of proof requirements described in Part I.B.6. Grab b. Post Mining Underground Areas - This category is subject to 40 CFR Part 434 Subpart E (Post Mining Areas). The following limitations apply to underground areas. The federal ELG limitations would apply until bond release. If these wastewaters are combined with other waters under Part I.B.1, then those limitations shall apply. If this wastewater is combined with post mining reclamation area wastewater, then these limitations apply to the combined discharge. If the post mining wastewater is separate, then the following limitations apply. Discharges of mine drainage from underground workings of underground mines which are not commingled with discharges eligible for alternate limitations set forth in this section shall in no event be eligible for the alternate limitations set forth in this section. •