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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866 -3567 <br />FAX: (303) 832 -8106 <br />April 6, 2012 <br />Kathleen G. Welt <br />Mountain Coal Company, LLC <br />P.O. Box 591 <br />Somerset, CO 81434 <br />Re: West Elk Mine (Permit No. C- 1980 -007) <br />Technical Revision No. 128 (TR -128) <br />Repairs of the ST -02 Pad slump and the HR -01 slide below the RPEE <br />Dear Ms. Welt: <br />COLORADO <br />Q I V I S I O N O F <br />RECLAMATION <br />MINING <br />SAFETY <br />John W. Hickenlooper <br />Governor <br />Mike King <br />Executive Director <br />Loretta E. Pineda <br />Director <br />The Division has received your application for a technical revision to your permit to conduct coal <br />mining in Colorado. The initial review indicates that all preliminary items required by Rule <br />2.08.4(5) have not been submitted. Thus, your application is incomplete for the purposes of filing <br />as of April 6, 2012. In accordance with Rule 2.07.3(1), you have the opportunity to amend, <br />review, or otherwise make your application complete. <br />Technical Revision 128 contains a report from Ground Engineering Consultants, Inc <br />regarding the remediation work completed on the slide at Stacking Tube 02 (ST -02). The <br />report basically states that the remediation work was completed in accordance with project <br />plans and that compaction testing was performed and was satisfactory. However, West Elk <br />did not include a slope stability analysis, a calculated factor of safety or any compaction <br />data for the remediated slide area. Please provide the Division with a slope stability <br />analysis, a calculated factor of safety and compaction data for the remediated slide <br />area at ST -02. <br />2. West Elk provided a plan view drawing for the ST -02 slide remediation that is labeled <br />section A -A'. However, there is no section A -A' shown on either of the as -built drawings <br />provided. Please indicate where section A -A' is located on the as -built drawings of the <br />ST -02 slide remediation. <br />West Elk submitted an engineering summary report from Barr Engineering Company, a <br />plan view and as -built drawings for the HR -1 slide area. The submittal did not include <br />compaction data, soil material properties, phreatic surface or a calculated factor of safety <br />for the slide remediation area. Please provide compaction data, soil and aggregate <br />material properties, location of phreatic surface and calculated factor of safety for <br />the HR -1 slide remediation area. <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines <br />