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M952s8GE <br />• slice are evaluated from the equilibrium of the slices; that is, <br />the forces that tend to drive the slice downhill and the forces <br />that tend tc resist the movement of the slice. The equilibrium of <br />the entire mass is determined by summing the driving and summing <br />the resisting forces acting on all slices and comparing these <br />forces. <br />Our slope stability analysis was performed using "Slope Stability <br />Analysis" by Geosoft computer software. Our slope stability <br />analysis considered a total of about 1,000 separate possible <br />failure surface iterations to help identify the potential theoreti- <br />cal slope stability. Our discussions and data presentation is <br />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 encountered in our test borings obtained during our field <br />study. Based on information provided by and as requested by Mr. <br />Jim Stover the proposed embankment material tests were based on <br />samples remolded to at least ninety (90) percent of the maximum dry <br />density as defined by ASTM D698, standard moisture content-dry <br />density relationship (Proctor) test. The soil strength values used <br />in our analysis included: <br />Site soil material: <br />Unconsolidated undrained: <br />an internal angle of friction of eleven (11) degrees, <br />cohesion of three-hundred sixty (360) pounds per square foot <br />and <br />a moist unit weight of one-hundred sixteen (116) pounds <br />per cubic foot, <br />Unconsolidated drained: <br />an internal angle of friction of fourteen (14) degrees, <br />cohesion of three hundred (300) pounds per square foot and <br />a moist unit weight of one-hundred sixteen (116) pounds per <br />cubic foot, <br />5 <br /> <br />~Lamberr ana ~ssoriate,~ <br />CONSUL TiMG GEOiECrv rviC~L EMGirv EE RS •rv0 <br />M •iE RILL TESiIMG <br />