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Mr. Mark Campbell <br />September 27, 2004 <br />Page 6 <br />LIMITATIONS <br />~~ <br />CIVIL RES'~U RCES, LLC <br />Our review is based on regional geologic mapping, present mining plans, borehole data, and stability analyses using <br />typical strength parameters for the various strata in the critical sections. Should the mining plans change or subsurface <br />conditions vary from those portrayed in this letter, we should be contacted in order to re-evaluate the potential affects on <br />permanent man-made 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 those calculated at the <br />permanent man made structures. Note also that suroharge loads due to temporary material stockpiles and overburden <br />berms were not considered in the analysis. <br />Please call with any questions or comments. <br />Sincerely, <br />Civil Resources, LLC <br />Mark Reiner, P.E., P.G. <br />Project Engineer <br />Attachments: Figures showing site location, boring and cross-section locations, geotechnical summary logs and <br />index table, and proposed extent of mining. Input and output files and graphic profiles of stability <br />anayses are also included. <br />Z:IprojecLslSW Investrnent GroupIDMG PERMIT1EzhibiLS for DMG1svNcodmgslopestbiliry.doc <br />