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MOUNTAIN COAL <br />COMPANYLL.C. <br />A Subsidiary of Arch Western Resources. LLC <br />September 17, 2009 <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 />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 />Re: Mountain Coal Company, LLC, West Elk Mine; Permit No. C-1980-007; Technical Revision No. 118, Coal <br />Preparation Plant and Coal Handling Facilities, Response to Adequacy Comments <br />Dear Mr. Kaldenbach: <br />Mountain Coal Company, LLC (MCC) provides the following responses to the adequacy comments on <br />Technical Revision No. 118 per your letters of September 03 and 14, 2009, respectively. The responses are <br />provided in the same order as presented in your letters. <br />September 03, 2009 letter: <br />1. Attached are the cover page and pages 1, 5 and 24 of Exhibit 51 (Lower Refuse Pile designs) that have <br />been revised to include discussions on the coal preparation plant (CPP), lab building and coal stockpiles <br />that will be constructed on top of the LRP. Reference to the stability analysis completed on the LRP <br />with the new building loads was also added. The stability analysis and addendum (per below) will be <br />added at the end of Exhibit 51. <br />2. Exhibit 67 (Windy Gap Process) was revised and submitted to you and Carl Johnston of OSMRE via e- <br />mail on September 90'. Carl has since responded that no consultation with the USFWS will be required. <br />3. Revised permit text pages correcting and incorporating the revisions approved per MR-353 and MR- <br />. <br />354, as well as the proposed revisions per TR-118 and TR-119 were e-mailed to you on September 140' <br />4. See response #4 above. <br />5. The reclamation cost estimate prepared by the Division on September 100' is acceptable. <br />September 14, 2009 letter: <br />6. A P.E. signed and stamped addendum to the LRP/ CPP stability analysis of September 8`h, utilizing the <br />parameters suggested by the CDRMS Engineer, Marcia Talvitie, was submitted to the CDRMS <br />yesterday. Marcia indicated by e-mail yesterday that the stability analysis with the addendum was <br />acceptable. The analysis and addendum has been referenced in Exhibit 51 and will be added at the end. <br />7. See response #6 above. <br />Please don't hesitate to contact me should you have questions. <br />Sincerely, <br />'f <br />Kathleen G. Welt <br />Environmental Engineer III <br />cc: Doug Nolte -MCC