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properties that will be required to provide a static factor of safety of 1.5. This <br /> information will then be used to establish minimum criteria for later construction <br /> of the final cover. <br /> 5.3.3.2 FINAL COVER RESULTS <br /> As shown in the attached calculations, the results of the semi-infinite slope <br /> analyses indicate that a static factor of safety of 1.5 can be obtained for the <br /> proposed final cover configuration providing that the interface between textured <br /> HDPE and the vegetative layer above it or clay below it develops an angle of <br /> friction of 27 degrees with no cohesion (i.e. + = 27° and c= 0). Review of the <br /> native soil data generated in the area by CH2MHill (1992) suggests that the <br /> required interface strength parameters can be achieved. <br /> The pseudo-static analyses that were completed to evaluate the final cover <br /> figuration indicate a yield acceleration of 0.15 g for these interface parameters. <br /> Using the Bray and Rathje (1998) procedure described above, no significant <br /> seismic-induced permanent displacement is anticipated for the proposed cover <br /> design during the postulated design earthquakes for these conditions. <br /> 5.3.4 SETTLEMENT ANALYSES <br /> The Forward landfill development will result in placement of a maximum of <br /> about 90 feet of additional Class II wastes over the existing Austin Road Landfill, <br /> approximately 70 feet of additional waste on the existing Forward Landfill, and <br /> approximately 200 feet of waste over the undeveloped area between the two <br /> landfills. The settlement analyses described here addresses future settlement of <br /> wastes under these loads. As such, the analysis considers consolidation of native <br /> subgrade soils and settlement of new and existing wastes through <br /> decomposition and mechanical compression/sorting processes. <br /> 5.3.4.1 PREVIOUS ANALYSES <br /> Potential settlement of the existing Austin Road Landfill expansion and Forward <br /> Landfill development were evaluated separately for the City of Stockton and <br /> Forward by R.W. Beck (1995) and CH2M Hill (1992), respectively. Since the <br /> proposed landfill geometries that were considered by R.W. Beck and CH2M Hill <br /> are very similar to the current proposed combined landfill configuration <br /> Forward Landfill)TD 5-17 <br /> L\Allied\2000.193`,ReportsUT D-PC PC MP702:Sec-5.0:5/24/02 <br /> Revision 1:07/16/02 <br />