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PART I <br />Page No. 7 <br />Permit No. COG-850000 <br />4. Effluent Limitations - Post Mining Areas <br />post-mining limitations may apply to outfalls serving reclamation areas, which have been returned to the required contour <br />and on which revegetation (specifically, seeding or planting) work has commenced. Limitations may also apply to 'post <br />nunina underground mine areas. The permittee may request consideration for change from active mining limitations to <br />post-mining limitations when these conditions have been met. <br />a. Post Mining Reclamation Areas - This category is subject to 40 CFR Part 434 Subpart E (Post Mining Areas). The <br />following limitations apply to reclamation areas. The federal ELG limitations would apply until bond release. If these <br />wastewaters are combined with other waters under Part I.B.1, then those limitations shall apply. If this wastewater is <br />combined with post mining underground mine wastewater, then the limitations in Part I.B.3.b apply to the combined <br />discharge. If this post mining wastewater is separate, then the following limitations apply. <br />Limtations Monitoring Sample <br />Paramett r 30-Day 7-Day Daily Rationale Frequency' Type <br />Avg. - -Avg Masc.. - - - - - <br />General Permit Requiremen - -- - <br />Flow, MGD <br />Report NA <br />Report <br />Discharge Evaluation Continuous / <br />Instantaneous2 Recorder / <br />In-situ 2 <br />s.u. <br />pH N/A NA 6.5-9.0 Water Quality Standards Weekly Grab <br />, <br />Total Suspended Solids, mg/l 30 45 NA State Effluent Regulations Weekly Grab <br />Vi <br />l 3 <br />Oil and Grease, mg/l N/A NA 10 State Effluent Regulations Weekly sua <br /> Federal Effluent Limitation Guidelines <br />Settleable Solids, ml/1 Report NA 0.5 Federal ELG Weekly Grab <br /> <br />mg/1 * <br />Total Dissolved Solids Site Specific Limitation <br />Report NA Report <br />Salinity Regulations <br />Quarterly 4 <br />Grab <br />, <br />Total Phosphorus (as P), mg/1 ** Report NA Various Control Regulations Monthly Grab <br />Total Recoverable Iron, ug/l 1000 NA NA Water Quality Standards Weekly Grab <br />Other Pollutants of Concern Various NA Various Water Quality Standards Weekly Grab <br />Whole Effluent Toxicity (WET) <br />Chronic Stat Diff and IC25 > IWC State Permit Limitations Quarterly 3 Grab/Te <br />Acute LC50 > 100% State Permit Limitations Grab <br />Footnotes 1-4, * , ** , and *** can be found under Part I.B.1 and Part I.B.2. <br />ALTERNATE LEWTATIONS FOR POST-MINING RECLAMATION AREAS <br />Any discharge or increase in the volume of a discharge from a reclamation area, caused by precipitation within any <br />24-hour period greater than the 10 year 24-hour precipitation event (or snowmelt of equivalent volume) may i <br />substitute the following limitations for these specific parameters only, subject to burden of proof requirements' <br />described in Part I.B.6. <br />b. Post Mining Underground Areas - This category is subject to 40 CFR Part 434 Subpart E (Post Mining Areas). The <br />following limitations apply to underground areas. The federal ELG limitations would apply until bond release. If <br />these wastewaters are combined with other waters under Part I.B.1, then those limitations shall apply. If this <br />wastewater is combined with post mining reclamation area wastewater, then these limitations apply to the combined <br />discharge. If the post mining wastewater is separate, then the following limitations apply. Discharges of mine <br />drainage from underground workings of underground mines which are not commingled with discharges eligible for <br />alternate limitations set forth in this section shall in no event be eligible for the alternate limitations set forth in this <br />section.