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R, AA® Mountain Coal Company Mountain Coal Company, LLC <br /> 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 /> August 26, 2016 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 MtN1 N OF 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 carry 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 /> i <br />