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Mrs <br /> Rkrz KLEINFELDER <br /> File No. 20-1008-38 <br /> August 1, 1990 <br /> i _ <br /> sand would also be expected to have a friction <br /> i <br /> - angle somewhere between approximately 35 and <br /> 40 degrees. For the purposes of this study, <br /> we have assumed 250 pounds per square foot <br /> cohesion with a friction angle of 30 degrees <br /> I <br /> and a unit weight of 125 pounds per cubic foot. <br /> i <br /> Based on the assumed values mentioned above, we performed slope <br /> stability analyses on the 2 profiles. our slope stability analyses <br /> r were performed using the computer program T-STAB which uses the <br /> Bishops modified method. T-STAB analyzes circular slip surfaces <br /> and has the capability to search for critical circles. Variations <br /> --- of slope geometry and soil properties can also be easily made with <br /> � - this program. The effect of ground shaking on the computed factors <br /> of safety was made by applying a site mean peak acceleration of <br /> .15g. This value is consistent with the slope stability analyses <br /> for levees in the San Joaquin County Delta area as well as slopes <br /> for other landfills in San Joaquin County. The Harney Lane <br /> ` Landfill and the Stockton area, in general, are considered to be <br /> in a low seismic area. our design value of .15g correlates well <br /> ;I <br /> with accelerations as discussed by Seed and Idriss 1985, Campbell <br /> 1981, and Joiner and Bore 1981. <br /> i Based on our assumptions, the computed factors of safety for the <br /> slope configurations are as follows: <br /> Primary Slope (2: 1) Factors of Safety <br /> Seismic 2.8 <br /> Static 4.3 <br /> - 4 <br />