2008-07-11_HYDROLOGY - C1992080 - Laserfiche WebLink

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PART I Page No. 10 Permit No. COG-850000 ALTERNATE LIMITATIONS FOR ACID OR FERRUGINOUS MINE DRAINAGE FROM COAL REFUSE PILES AND FROM STEEP SLOPE AREAS OR MOUNTAINTOP REMOVAL OPERATIONS Any discharge or increase in the volume of a discharge caused by precipitation within any 24 hour period greater than the 1-year, 24-hour precipitation event, but less than or equal to the 10-year, 24-hour precipitation event (or snowmelt of equivalent volume) may may substitute the following limitations for these specific parameters only, subject to burden of proof requirements described in Part I.B.6 - - Lutitaticins T -- - - - - Monitoring Sample ararneter 30 Day P 7-Day Daily Rationale Frequency Type . -- " - - - - -----_ _ Federal Effluent Limitation Guideline Weekly Grab Total Suspended Solids, mg/1 Report NA A Report Federal ELG ort Federal ELG Re Weekly Grab Total Manganese, mg/1 Report N p Total Iron, mg/1 Existing Sources (before5/4/84) New Sources (after 5/4/84) Settleable Solids, ml/l 6. Burden of Proof Requirements The permittee has the burden of proof when requesting relief from total suspended solids (TSS), total iron, and/or settleable e has control solids limitations. Relief shall be granted only when necessary and shall not be granted hn when the perms to The Division shall over the discharge. The permittee should endeavor to meet the primary limitations have final authority in determining whether relief is granted. a) For rainfall, to waive TSS and total iron limitations, it is necessary to demonstrate that discharge occurred within 48 hours after measurable precipitation has stopped. To waive settleable solids limitations, it is necessary to prove that discharge occurred within 48 hours after precipitation greater than the 10-year, 24-hour event has stopped. b) For snowmelt, to waive TSS and total iron limitations, it is necessary to demonstrate that discharge occurred within 48 hours after pond inflow has stopped To waive settleable solids limitations, it is necessary to prove that discharge occurred within 48 hours after pond inflow volume greater than the 10-year, 24-hour event has stopped. The Division shall determine the adequacy of proof. As part of this determination, the o could Division have been matte whe her thl permittee could have controlled the discharge in such a manner that primary dewatering of ponds that are equipped with automatic dewatering systems must meet TSS, total iron, and total manganese limitations. If a pond has only manual dewatering capability, relief is available only to the extent required to regain necessary stability and capacity. 7. Compliance Schedules Any compliance schedule related requirements will be included in the certifications. 8. WET Testing a. Acute WET Testing (See also Part I33.7.c for WET requirements applicable to both chronic and acute WET testing) i 1. Testing and Reporting Requirements Tests shall be done at the frequency listed in Part I.B.1. Test results shall be reported along with the Discharge Monitoring Report (DMR) submitted for the end of the reporting period when the sample was taken. (i.e.,' WET testing results for the calendar quarter ending March 31 shall be reported with the DMR due April 28, etc.) The results shall be submitted on the Acute Toxicity Test report form, available from the Division. Copies of these reports are to be submitted to the Division along with the DMR. The permittee shall conduct each acute WET test in general accordance with methods described in Methods for Measuring the Acute Toxicity of Effluents and Receivrng Waters to Freshwater and Marine Ortranisms EPA/600/4- ?,.??„ o...,.., ,„,,,tifi-I t,v rhP mnct current Division guidance document entitled Report NA Report Federal ELG Report NA Report PP r%rt NA 0.5 Federal ELG Weekly Grab W