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MOUNTAIN COAL <br />COMPANYL.L.C. <br />A Subsidiary of Arch Western Bituminous Group, LLC <br />July 08, 2010 <br />?„ ?', ,SID <br />b <br />Z J0 <br />'1rr L,.., \L? <br />30d ?3vv., <br />??rin9 <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 />Re: Mountain Coal Company, LLC, West Elk Mine; Permit No. C-1980-007; Technical <br />Revision No. 121, Temporary Access to E3 and E4 MDWs <br />Dear Mr. Kaldenbach: <br />Mountain Coal Company (MCC) submits the following responses to your July 6t" adequacy <br />comment letter. The CDRMS comment is provided, followed by MCC's italicized response. <br />7. "Is MDW E3-72 proposed to be eliminated from the MDW drilling plan? Your <br />previously submitted "TR-121 Project Details" shows E3-72 as eliminated, but item 4 <br />of your letter of June 11, 2010 shows this MDW as planned for drilling in 2010." <br />Below is an updated table of the 2010 proposed MDW drilling showing that the MDW <br />formerly called E3-72 is now proposed to be called E3-71. MDW E3-72 has been <br />eliminated. Please recall that these are proposed MDW names/numbers, so the <br />actual numbers may be different. An updated map 53D and MDW tracking <br />spreadsheet will be provided after the 2010 MDW construction is completed. <br />Revised 2010 Proposed MDW Drilling, <br />Total Estimated Disturbed Areas <br />Location Road (ft) Road <br />Acreage Pad (Sq. Ft) Pad Acreage <br />E2-15.5 (Eliminated) <br />E2-11.5 (Now E2-13) 21780 0.50 <br />E2-8 (Now E2-9) 1332 0.76 21780 0.50 <br />E3-78, E3-76, E3-75 1976 1.13 75,000 1.72 <br />E3-72 (Now E3-71) 13054 0.30 <br />E3-68 Added for 2010 2962 1.68 21780 0.50 <br /> <br />Total Road Acreage 3.57 1 1 <br />Total Pad Acrea a 3.52