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wooAl"A <br />Mountain Coal Company <br />August 07, 2017 <br />Mr. Leigh D. Simmons <br />Colorado Division of Reclamation, Mining and Safety <br />Office of Mined Land Reclamation <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Mountain Coal Company, LLC <br />West Elk Mine <br />5174 Highway 133 <br />Somerset, CO 81434 <br />Kathleen G. Welt <br />Environmental Engineer III <br />kweltgDarchcoaI.com <br />Phone: 970.929.2238 <br />Re: Mountain Coal Company, LLC, West Elk Mine; Permit No. C-1980-007; <br />Minor Revision No. MR -422: New Potable Water Tank <br />Dear Mr. Simmons: <br />Mountain Coal Company, LLC (MCC) submits this letter, application form, revised table 44E <br />and revised permit maps Nos. 53 and 54 in application of Minor Revision No. MR -422. The <br />purpose of this revision is to add a new potable water tank just uphill (northwest) of the <br />location of the existing tank in a previously disturbed area. Upon activation of the new water <br />tank, the existing tank will be drained and left in place for demolition at a later time. <br />The new 175,000 -gallon steel potable water storage tank will be 38'7-5/8" in diameter and <br />24' in height, set on a reinforced concrete ring wall footing that is 1' 3" thick and 3' 6" deep. <br />The tank foundation area will be excavated about 6' deep and a minimum of 2' of structural <br />fill will be compacted over the entire area. The ring wall footing will then be constructed and <br />after the concrete has properly cured, additional structural fill will be compacted in the area <br />within the ring wall footing to within 3" of the top. Structural fill will also be compacted in the <br />excavated area outside the ring wall footing. The top 3" of the area within the ring wall <br />footing will be filled with compacted sand, completing the tank foundation. <br />After the tank is secured on the foundation, the area around the tank will be recontoured and <br />a 10' wide graveled driveway will be constructed around the perimeter of the tank. An 8'x 8' <br />x 8' prefabricated wooden shed will be set on the west side of the tank to house the controls <br />and monitoring equipment for the tank. One power pole will be erected nearby so that <br />electrical service can be routed into the control building. <br />New aboveground, insulated pipelines will be installed to deliver treated water to and from <br />the new potable water storage tank. The treated water inlet pipeline will be 150' of 4" HDPE <br />pipe that will be tied into the current water pipeline by the existing water tank and routed <br />uphill (west) to the new tank. The treated water outlet pipeline will be 150' of 6" HDPE pipe <br />that will be routed through the new control building and then north, alongside the existing <br />