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Mountain Coal Company <br />December 11, 2013 <br />Mr. James R. Stark <br />RECEIVED <br />Colorado Department of Natural Resources DEC 18 2013 <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 DIVISION OF RECLAMATION <br />Denver, CO 80203 MINING AND SAFETY <br />Mountain Coal Company, LLC <br />West Elk Mine <br />P.O. Box 591 <br />Somerset. CO 81434 <br />Jessica A. Loveland, P.E. <br />Environmental Engineer <br />iloveland(cDarchcoal.com <br />phone: 970.929.2308 <br />Re: Mountain Coal Company, LLC, West Elk Mine; Permit No. C- 1980 -007; <br />Minor Revision No. MR -403, Temporary Topsoil Pile, Clear Water Culvert, and <br />Sediment Ditch Liner for RPEE <br />Dear Mr. Stark: <br />Mountain Coal Company, LLC (MCC) submits this letter and application form for Minor Revision No. MR- <br />403. This revision is to establish a temporary topsoil pile, install a culvert along a small section of the interim <br />clear water diversion ditch and install a sediment ditch liner in lieu of riprap in the interim ditch at the south end <br />of the RPEE. <br />MCC was in the process of stripping topsoil to the south of the existing, uppermost lift on the RPEE when snow <br />accumulations curtailed further site preparation. As a result, a small topsoil pile had to be left in place for the <br />winter. A topsoil sign will be placed on the pile and a small diversion ditch established to route drainage away <br />from the pile next spring. <br />A segment of the western interim clearwater ditch crossed a small, spring fed swale that might direct flows <br />toward the RPEE rather than divert them away. To better avoid potential additional contributions of water from <br />the swale to the RPEE next spring, MCC will install a culvert in the clearwater ditch across this area. <br />The west sediment ditch along the southern-most extent of the interim RPEE refuse pile could not be armored <br />with riprap as is part of the approved design before these construction operations were also curtailed by snow. <br />To better ensure that the ditch is sufficiently armored to handle runoff flows next spring, MCC will instead place <br />an armoring material called "SmartDitch" in the ditch in lieu of riprap. <br />Attached are calculations for the culvert, as well as the SmartDitch liner showing, that both are sufficient for <br />projected 100 -yr flows. 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: Jessica Loveland <br />Weston Norris — MCC <br />Mike Peacock — MCC <br />Neal Starkebaum — Gunnison Co. <br />