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Mrs. Kathy G. Welt <br />• August 9, 1994 <br />Page 3 <br />equilibrium procedure to calculate the factor of safety against failure. The input <br />information for the analyses includes, but is not limited to, slope geometry, <br />groundwater conditions, soil strengths, and loading conditions. <br />The slope stability analysis is summarized in the following table. <br />Fan bench Staging Area/Subsoil Topsoil Pile Reclaimed Fenbench <br />(cross section (cross section (cross section (cross Section <br />D-D) G-G) B-B) D-D) <br />original: 1.61 2.58 1.89 <br />Proposed: 2.12 2.07 1.75 1.65 <br />The calculated factors of safety for all bench and piles are above the minimum <br />factor of safety of 1.30, as required by the State of Colorado Mined Land Reclamation <br />• Board, 1991. Uncon4ined compression testing of the shales indicated that the <br />sirength far exceeded the strengih of the native coliuvial soils. Therefore, failure of <br />the soil controlled for all analyzed configurations. If you have any questions or <br />require further assistance, please give me a caii. <br />Sin erely, <br />,, <br />Charlie Rehn P.E. <br />CCRItp <br /> <br />