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June 30, 2011 <br />MOUNTAIN COAL <br />COMPANY,. Lc. <br />A Subsidiary of Arch Western Bituminous Group. LLC <br />Mr. Tom Kaldenbach <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 />West Elk Mine <br />P.O. Box 591 <br />5174 Highway 133 <br />Somerset. CO 81434 <br />(970) 929 -2200 <br />fax (970) 929 -5050 <br />RECEIVED <br />JUN 3 0 2011 <br />Division of Ration <br />Mining and Safety <br />Re: Mountain Coal Company, LLC, West Elk Mine; Permit No. C- 1980 -007; Minor <br />Revision No. MR -378, Pipeline from Jet Hole 1 and MDW 24-08 to Mine Air <br />Heaters Pipeline <br />Dear Mr. Kaldenbach: <br />Mountain Coal Company, LLC (MCC) submits this letter and application form for Minor <br />Revision No. MR -378 to install a pipeline from Jet Hole 1 (JH 1) and MDW 24 -08 into the mine <br />air heaters pipeline to Shaft #1. As depicted on the attached drawings, about 1,500' of 16" <br />diameter HDPE pipe will be buried under the existing road drainage ditch from JH 1 and tie <br />into the current mine air heaters pipeline and methane exhaust building. About 200' of 8" <br />diameter HDPE pipe will be buried in the existing well pad to connect MDW 24 -08 to the JH 1 <br />pipeline. The wells and pipe connections on the surface will be secured within a 6' high chain - <br />link fence (approximately 10' x 10' at each well head). <br />Please contact me at (970) 929 -2238 or by e-mail should you have questions regarding this <br />submittal. <br />Sincerely, <br />KatlSlden G. Welt, <br />Environmental Engineer Ill <br />cc: Doug Nolte — MCC <br />Joanne Williams — Gunnison Co. <br />