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~M`OUNTAIN COAL <br />VCOMPANY~.~.~. <br />A Subsidiary of Arch Western Resources, LLC <br />October 9, 2006 <br />Mr. Tom Kaldenbach <br />Colorado Division of Minerals and Geology (CDMG) <br />Office of Mined Land Reclamation <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />OCZ 12 2006 <br />pivison of R'-clamation, <br />Nluun9 3nJ gaiety . <br />West Elk Mine <br />P O Box 591 <br />5174 Highway 133 <br />Somerset, CO 81434 <br />(970) 929-5015 <br />Fax (970) 929-5595 <br />Re: Mountain Coal Company LLC (MCC), West Elk Mine; Permit No. C-80-007; Minor Revision No. <br />336, (MR-336), Minnesota Reservoir Robotic Total Station Enclosure Installation. <br />Dear Mr. Kaldenbach, <br />Mountain Coal Company, L.L.C. is submitting this Minor Revision to its Mining and Reclamation Permit to <br />include the attached plans for installing an enclosure for a robotic total station (RTS). <br />MCC is requesting this minor revision to install aconcrete-filled pipe (approximately 6" in diameter) to <br />bedrock and move askid-mounted steel building to a site in Section 32, T. 13 S., R. 90 W., 6th PM. The <br />purpose of the instrumentation and associated enclosure is to monitor movement associated with Monument <br />Dam and Minnesota Reservoir and the landslide located on the south (left) abutment of the dam. The skid <br />mounted steel building, with steel floor, will be approximately 10' wide, 10' long, and 10.5' high. Associated <br />with the enclosure will be a solar panel and antenna installed on the roof. It is planned that the building will be <br />situated at an approximate elevation of 8,040 feet ASL. <br />Currently, access to the site will be via an existing light-use road. The site location is located on MCC private <br />property. Agate will be installed where the road intersects with USFS Road 711.2B, (Jumbo Mountain Road). <br />Please notify me with the Division's bond liability estimate so that arrangements can be made should the <br />estimate exceed the current total bond amount of $12,000,000.00. If you have questions regarding this minor <br />revision and information please call me at (970) 929-2238. <br />Si rely, L~~~""~"L <br />enry B r e <br />Environm ntal Engineer <br />Enclosures: Minnesota Reservoir Robotic Total Station Enclosure Location; Specifications for Minnesota <br />Reservoir Robotic Total Station. <br />cc: P. Wyckoff <br />D. Nolte <br />J. Porter <br />