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POWDERHORN <br />COAL COMPANY <br />July 13, 1995 <br />RECFI!/ED <br />.•) n ~ i~Jal <br />L .~ __ ~ <br />Division of N:inorals 3 Goolopy <br />Grand Junction <br />Mr. Dan Mathews <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />2148 Broadway, #C-5 <br />Grand Junction, CO 81503 <br />RE: Notice of Violation C-95-021, File C-81-041 <br />Dear Mr. Mathews: <br />III IIIIIIIIIIIII III <br />999 <br />P.O. Boa 1430 <br />Paiieatle, Coloratlo 61526 <br />(303) 464-7951 <br />Fax (303)464-7161 <br />In response to the subject NOV, this letter is being written to <br />meet the remedial action abatement requirements. Information is <br />being supplied on the current mine dewatering system, what caused <br />the non-compliant discharge, what was done at the time and what <br />will be done in the future. <br />The attached diagram is a portion of our 1994 Mine Inflows Study <br />map for the Roadside North Portals. Notations have been added to <br />the diagram to show current information and letters have been <br />added to pumps to simplify discussion. Discharge to Coal Creek <br />is from Pump A located at the mine portal. This sump includes <br />continuous discharge from the portal decline underdrains <br />(location 1), intermittent discharge from Pump B and surface <br />runoff in the portal decline area. Pump B is supplied from a <br />siphon out of a sealed area (location 8), from small inflows <br />upgradient of the pump and from Pump C. The sump associated <br />with Pump C includes inflows below Pump B (locations 4, 5 and 6). <br />This sump is the only one of any size in the system and has a <br />capacity of approximately 200,000 gallons. Flow at location 6 <br />includes inflows from the #1 West Mains (location 7) and the #1 <br />West Panel (location 9) by way of Pump D. The mine water system <br />is supplied by Pump E. The sump associated with this pump is <br />filled with a portion of the water from Pump B. <br />Non-compliant discharge was suspected at discharge point 004 <br />around noon during your inspection of June 30, 1995. Samples <br />were taken and found to be out of compliance on Total Suspended <br />Solids (TSS). Your sample analyzed at Grand Junction Labs showed <br />548 mg/1 and my sample analyzed at Intermountain Labs in <br />Farmington, NM, showed 640 mg/1. The last weekly monitoring of <br />this water was done on June 29, 1995, at which time, the <br />discharge appeared clear and within discharge limits. <br />