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Mountain Coal Company ww Eltc Aw+• a•a Dora emc sei - Sanr~ Caiorsdo 87434 TWphaw 9709Q8Fi075 Fit 9'70 978.5GB6 March 15, 1996 Mr. David Beny Colorado Division ofI~finerals & Geology 1313 Sherman Street, Room 215 Denver, CO 80203 nr/+C11lFp MHlpiVl&IUi~~.,. ..~~~~~~~~n w w.kpIG1QY RE: Technical Revision No. 78; Rest Elk Mine; Permit No. C-80-007 Dear David: v:.~ ..q Mourrtain Coal Company (MCC) requests a revision to Permit C-80-007 to reconfigure the Lower Refuse Pile (LRP). Enclosed is an application for a technical revision which proposes to redesign the LRP to allow for the disposal of approximately 360,000 cubic yards of additional coal mine waste. The additional yardage will result in the final storage capacity of 1.38 millioa cubic yards. At the current volume of refuse material that is being generated, the LRP will reach its currently designed configuration of 1.02 million cubic yards in June 1996. The reconfiguration will extend the life of the pile to October 1996, which will allow sufficient time to penarit and construct a new refuse pile to be submitted in a separate application in the near future. wth the assistance of Harding Lawson Associates, MCC has included in the application new stability analyses, leachate calculations, ditch and culvert designs, and drawings of the final configuration. Specifically, there are three copies of the following included in the application: Exhibit 51 • Revised Text (pages I-37) • New Figure 2.OB Appendix B • New Figure 2.OC Appendix B • New Figure 2.OD Appendix B • New Figure 2.0E Appendix B • New Figure 2.OF Appendix B • New Leachate Model Appendix H • New Refuse Shear Test Gradations Appendix K • New Figure 4.0 Appendix K • New Surface Water Runoff Calculations and Designs Appendix L Exhibit 66 • Revised Table 44 • Revised design for D2R-2 at Base iiiiiiiiiiiiiiiiiii 999