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analysis program uses the simplif ed Bishop and Janbu methods of analysis. <br />The user enters the geologic cross-section model parameters and the failure <br />surface search method; the computer algorithm searches through thousands <br />of failure surfaces and prints out ten with the lowest FOSS. Refer to Slope <br />Analysis with XSTABL, Sunil Sharma, Department of Civil Engineering, <br />University of Idaho, Moscow, ID, June, 1992, for more detail on XSTABL <br />analytical methods. <br />Soil parameters used for the model aze presented in Table 2. The values <br />aze based upon previous studies (International Engineering Company, Inc., <br />Foundation Investigation Report, Proposed Coal Preparation Plant, Mount <br />Gunnison Mine, Somerset, CO, October, 1976; and Chen and Associates, <br />Geotechnical Site Evaluation, July 31, 1980) with the exception of the <br />colluvium and collapsed coal seams. The colluvium parameters came from a <br />recent (June, 1994) triaxial stress test performed on a borehole sample taken <br />prior to construction of the materials storage bench. The mined coal seam <br />parameters aze conservatively set as a nearly cohesionless soil horizon. <br />9 <br />