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TETRA TECH RMC Mr. Mike Refer <br />May 12, 2004 <br />Page 8 <br />structures. Stability analyses were run at the structure in question and were not run on failure <br />surfaces closer to the highwall. Factors of Safety at and closer to the highwall will be less than <br />those calculated at the permanent man made structures. Note also that surchazge loads due to <br />temporary material stockpiles and overburden berms were not considered in the analysis. <br />Please call with any questions or comments. <br />Sincerely, <br />TETRA TECH RMC, INC. <br />_~~//~- <br />Christoph Goss, PhD <br />Mining Engineer <br />C <br />\Don W. Deere, P.E., P.G. <br />Vice-President <br />CG:cg <br />Attachments: Boring Locations and mine plan (reduced 11x17) <br />Input/output Files and Graphic Profiles of Stability Analysis <br />cc: Bazb Brunk, Tetra Tech RMC <br />F:V 919_019VCatabNtcpon\Tuaav Satlh Sbpc SuMIay.lv.doc <br />