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• 3. Strength Parameters Used in Slooe Stability Analysis <br />Based on Table 1 and the density tests, the soil materials for this analysis will have the <br />following strength parameters: <br />Embankment (classified as an SM-SC soil) <br />a) maximum dry density 119 Ibs/cu.ft (this is conservative since the actual test showed a much <br />higher density) <br />b) as compacted cohesion of 0.14 tons per square foot or 280 Ibs/sq.ft. (This is the low end of <br />the range in Table 1) <br />c) friction angle of 30 degrees. (This is also the low end of the range in Table 1). <br />Foundation (classified as an GM soil) <br />a) maximum dry density 82 Ibs/cu.ft (this is slightly lower than the actual test dennity) <br />b) as compacted cohesion of 0.0 tons per square foot or 0 Ibs/sq.ft. (See Table 1) <br />• c) friction angle of 33 degrees. (This is also below the low end of the range in Table 1). <br />Due to the possibility of different soils being present for both the dam and the foundation <br />material, various cases will be run with different strength parameters to account for any soil <br />type which could be encountered. <br />Since the slopes of the pond are mild (2.5:1) and the height is no greater than 10.0 feet, it is <br />shown that any possible combination of strength parameters will attain the long-term safety <br />factor of 1.3, therefore, no triaxial shear testing of the material has been done. Also, it would be <br />very difficult to get a representative sample from all the pond areas in question, therefore <br />varying cases would need to run regardless of the results of any single test. <br />4. Other Parameters Used in the Slooe Stability Analysis <br />The program SB-SLOPE was used to analyze the slope stability, which uses the Bishops <br />method of slices for cylindrical failure. It is not possible that the dam and foundation for this <br />• case would result in a plane failure therefore, this failure type will not be studied. Map 1 shows <br />(Revised 12/00) Attachment 2.05.3(3) -10-113 <br />