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Mountain Coal Company <br />V I ��A A <br />August 26, 2016 <br />Mountain Coal Company, LLC <br />West Elk Mine <br />5174 Highway 133 <br />Somerset, CO 81434 <br />Jessica A. Wilczek, P.E. <br />Environmental Engineer <br />j I oveland(caarchcoal.com <br />phone: 970.929.2308 <br />RECEIVED <br />Mr. Leigh Simmons <br />Colorado Department of Natural Resources SEP 012016 <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 pR M MtN1NOF RECLAMATION <br />Denver, CO 80203 NG AND SAFETY <br />Re: Mountain Coal Company, LLC, West Elk Mine; <br />Permit No. C-1980-007, Minor Revision No. MR -418, Rerouted MSB Drainage <br />Dear Mr. Simmons: <br />Mountain Coal Company, LLC (MCC) submits this letter, application form, maps and supporting calculations <br />for Minor Revision No. MR -418. The purpose of this revision is to provide documentation that the existing <br />ditches and culverts are sufficient to cant' the rerouted stormwater flows. The attached map shows the former <br />flow path and the new flow path that now carries flows from the Materials Storage Bench (MSB), around the <br />LRP and to Pond MB -5E. The former path was through a longer culvert (that was damaged by heavy wet <br />snows causing leaks earlier this year) and through culvert C5E-24 to ditch D5E-6, that also flowed to Pond MB - <br />5E. As shown on the attached calculation sheets, the maximum designed flows in each of the ditches and <br />culverts downstream of culvert C5E-25 are large enough to also carry the flows added from the MSB. Copies <br />of the existing approved ditch and culvert designs from Exhibit 66 are also provided for your convenience. <br />Please contact me at (970) 929-2308 or by e-mail should you have questions regarding this submittal. <br />Sincerely, <br />Jessica A. Wilczek, P.E. <br />Env' ental Engineer <br />g� <br />cc: eston Norris — MCC <br />Neal Starkebaum — Gunnison Co. <br />