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M05003MT <br />Our slope stability analysis was performed using "An Integrated <br />Slope Stability Analysis" by XSTABL computer software. Our slope <br />stability analysis considered several different cross sections with <br />a total of about 1,000 separate possible failure surface iterations <br />for each analysis to help identify the potential theoretical slope <br />stability. A total of nine (9) different cross sections are <br />presented with this report. Our discussions and data presentation <br />is based only on the calculated critical circle which presented the <br />lowest factor of safety against failure. Our presentation does not <br />include the results of all of the iterations which resulted in a <br />theoretical factor of safety greater than the lowest factor of <br />safety and therefore were not critical. <br />Our analysis was based on soil strength characteristics obtained <br />from laboratory triaxial shear strength tests of samples of soil <br />material remolded from on site materials. Soil strength <br />characteristics presented in our 10 November 2003 Geotechnical <br />Engineering Study were also utilized in our analysis and are <br />summarized below. The soil strength values used in our analysis <br />included: <br />Site soil material (Reference: 10 November 2003 <br />~~ Engineering Study): <br />Geotechnical <br />• <br />• <br />. an internal angle of friction of twenty-four (24) degrees, <br />. cohesion of six hundred ninety (690) pounds per 'square foot <br />..~ and <br />. a moist unit weight of one-hundred twenty-five (125) pounds <br />per cubic foot, and <br />Coal Gob Embankment Material (Average values from ten (10) <br />+, samples): <br />an average internal angle of friction of nine and eight <br />tenths (9.8) degrees, I <br />an average cohesion of four hundred ninety-two and five <br />tenths (492.5) pounds per square foot, and <br />a moist unit weight of one hundred ten and five tenths <br />(110.5) pounds per cubic foot. <br />4 <br />~Cambert ana ~,s~,oociates <br />CONSULTING GEOTECNNICAL ENGINEERS ANO <br />MATERIAL TESTING <br /> <br />