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<br />' modification, the high wall area was found to range from unstable <br />through marginally stable to stable, depending upon the shear strength <br />assumptions used for the materials in the high wall. The existing <br />bench fill embankment was found to be marginally stable under all <br />conditions of assumed shear strength. <br />t In the case of regrading the area, utilizing borrow materials <br />from the existing bench fill and backfilling only to the level of the <br />' existing bench approximately ht:lf tioay up the high wall, factors o'f <br />safety indicated marginally stable to stable conditions, depending, <br />upon the shear strength assumptions used for the materials in the <br />high wall. ,~~.,.have determined from further analysis that the requirediR <br />factoz of safety of:~..3 may be satisfied if the high wall materials <br />are assumed to have a minimum friction angle on the order of 41 degree9x <br />1 We fee] this assumption with regard to shear strength is reasonable ford <br />J the materials observed. <br />~ All additional alternatives considered were found to be margin- <br />ally stable, with factors of safety less than the required 1.3. Further, <br />assumptions with regard to shear strength of the high wall and founda- <br />tion materials had little or no effect on the overall stability. <br />J Should it be desired to utilize one of the latter alternatives for <br />7 grading, a loading berm placed at the base of the existing bench fill <br />1 embankment would be required to achieve the required factor of safety <br />l of 1.3. Results of loading berm design and analysis will also be <br />found in this table. <br />l All of the general information described above for each alterna- <br />tive analyzed has been summarized on a "Slope Stability Summary Sheet" <br />which will be found in the Appendix of this report. <br />i _10- <br />