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C/ r8'o 00 7 <br />Ge'a A --r Co ro'4-y "1-04, <br />SUNRISE ? Memorandum <br />4?y ENGI1NEFRING j <br />To: Kathy Welt <br />cc: Charlie Rehn <br />From: Derek Johnson <br />Date: 6/15/2009 <br />Re: Mountain Coal Company - Refuse Pile Expansion Stability Analysis <br />Work completed thus far on the Mountain Coal Company (MCC) Refuse Pile Expansion (RPE) includes: <br />• Existing Project Review- The original RPE report, model and associated exhibits have been reviewed to provide our <br />staff with background of the original findings and recommendations for the RPE. <br />• Modelin¢- A slope stability model has been set up based on the existing cross sections and known geology. Test runs <br />with this model have shown to be consistent with the original model findings. Once the final geotechnical <br />information is available it will be incorporated into this model to produce the final sensitivity graph. <br />• Testine- Testing of the eleven material samples is complete for all tests except the Triaxial Compression Tests for six <br />of the samples. According to our testing laboratory, it is anticipated that these remaining tests will be completed by <br />next week. <br />Once we have all of the testing information we will do a sensitivity analvsis and produce a final report of our findings. <br />12227 SOUTH BUSINESS PARK DR, S i E 220 • DRAPER, UTAH 84020 • TEL 8015210100 •888.523.2221 • FAX 801.523.0990 WWW.sunrise-eng.com