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Mountain Coal Company <br />October 24, 2017 <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 />kwelt(MarchcoaI.com <br />Phone: 970 929 2238 <br />RECEIVED <br />Mr. Leigh D. Simmons OCT 25 2017 <br />Colorado Division of Reclamation, Mining and Safety <br />Office of Mined Land Reclamation Division of Reclamation, <br />1313 Sherman Street, Room 215 Mining & Safety <br />Denver, Colorado 80203 <br />Re: Mountain Coal Company, LLC, West Elk Mine; Permit No. C-1980-007; <br />Minor Revision No. MR -426: Add Culvert C5E-24A <br />Dear Mr. Simmons: <br />Mountain Coal Company, LLC (MCC) submits this letter, application form, revised Table <br />44E, existing culvert C5E-23 calculations, and revised Map 54 in application of Minor <br />Revision No. MR -426 to add culvert C5E-24A upstream of existing culvert C5E-24 in ditch <br />D5E-31. The purpose of this new culvert is to divert the majority of flows from ditch D5E-31 <br />under the access/haul road and into culvert C5E-23, rather than allowing these flows to <br />continue to flow into the section of ditch D5E-31 that has been damaged by the MSB slump. <br />New culvert C5E-24A will be less than 90' long and the same minimum diameter as existing <br />culvert C5E-24A, even though the flows will be less (because the area flowing to ditch D5E- <br />31 and being diverted into new culvert C5E-24A will be less). Calculations were also <br />completed to verify that the existing 24" culvert C5E-23 was large enough to carry the flows <br />from ditch D5E-31 (i.e. 19.87 cfs through new culvert C5E-24A) and the existing designed <br />flows from ditch D5E-30 into culvert C5E-23 (i.e. 1.27 cfs). These combined flows total <br />21.14 cfs and are within the maximum designed flow capacity of 29.95 cfs for existing 24" <br />C5E-23 culvert. <br />Please contact me at (970) 929-2238 or by e-mail should you have questions regarding <br />this submittal. <br />Sincerely, <br />Kathleen G. Welt, <br />Environmental Engineer III <br />cc: Weston Norris — MCC <br />Earl Quesenberry - MCC <br />Neal Starkebaum - Gunnison Co. <br />