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• 5. Factor of Safetv Cases and Results <br />• ,; <br />• <br />Case # Density Cohesion Internal Minimum Comments <br /> (Ibs/cu.ft.) (Ibs/sq.ft.) Angle of Factor of <br /> Friction Safety <br />1 -embankment 119 280 30 2.19 This case uses <br /> h <br /> - - slightly hig <br />er <br />1 -foundation 110 0 33 foundation density. <br />2 -embankment 119 280 30 1.73 This is the case <br /> which uses the low <br />2 -foundation 82 0 33 values from Table <br /> 1. <br />3 -embankment 106 200 28 1.52 Absolute worst <br /> <br /> case strength <br />3 -foundation 76 0 30 parameters. <br />4 -embankment 118.6 420 33 1.95 Most likely case <br /> using average <br /> parameters from <br />4 -foundation 84 <br />8 0 34 Table 1 and <br /> . density measured <br /> on site. <br />5 -embankment 119 280 30 2.46 Case where <br /> cohesion is <br /> present in <br /> foundation soil and <br />5 -foundation 82 160 33 embankment <br /> parameters are <br /> conservative <br />6 -embankment 118.6 420 33 2.54 Case where <br /> cohesion is <br /> present in <br /> foundation soil and <br />6 -foundation 82 160 33 embankment <br /> parameters are <br /> average <br />Note: The grid used to perform the search of the center of the circle with the weakest factor of <br />safety was selected to avoid the inside part of the embankment. Failure on this side would only <br />occur due to rapid drawdown which is not possible due to the type of principal spillway system <br />used in the pond. See pond design section of the permit. <br />The case runs of Appendix 1 show that the grid search uses an increment of 2.0. Since the <br />factors of safety for aN cases are well below the required factor of safety of 1.3, no additional <br />searches have been run using a lower increment, since there is no way the factor of safety <br />could be below the required amount. <br />asviseo naxca zoos Attachment 2.05.3(3}15-5 <br />