2018-08-08_PERMIT FILE - C1982056 (14)

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PART 11 Page No. 7 Permit No COG -850000 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 post mining undereround 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 Minine 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. Limitations Parameter 30 -Day 7 -Day Daily Rationale Monitoring "Sample Avg. Avg. Max. Frequency Type Permit Requirements ---------------------------- Flow, MGD Report NA Report Discharge Evaluation Continuous/ 2 Record2 r / Instantaneous In-situ pH, s.u. N/A NA 6.5-9.0 Water Quality Standards Weekly Grab Total Suspended Solids, mg/1 30 45 NA State Effluent Regulations Weekly Grab Oil and Grease, mg/I N/A NA 10 State Effluent Regulations Weekly Visual' ------------------ -----Federal Effluent Limitation Guidelines------___________.____�_____ Settleable Solids, ml/l Report NA 0.5 Federal ELG Weekly Grab Specific Limitations ------------------_��____��__ Total Dissolved Solids, mg/I • Report NA Report Salinity Regulations Quarterly ° Grab Total Phosphorus (as P), mg/l •• Report NA Various Control Regulations Monthly Grab Total Recoverable Iron, ug/1 1000 NA NA Water Quality Standards Weekly Grab Other Pollutants of Concern Various NA Various Water Quality Standards Weekly Grab Whole Effluent Toxicity (WET) Chronic Stat Diff and IC25 > IWC State Permit Limitations Quarterly 3 Grab/Test Acute LC50 > 100% State Permit Limitations Grab Footnotes 1-4, • , •• , and ••• can be found under Part i.B.l and Part I.B.2. ALTERNATE LIMITATIONS FOR POST -MINING RECLAMATION AREAS 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. Limitations Parameter 30 -Day 7 -Day Daily Rationale Monitoring Sample Avg. Avg. Max. Frequency Type ----------------------------Federal Effluent Limitation Guidelines ------------------------------------- Settleable Solids, ml/1 Report NA Report Federal ELG Weekly 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.