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• 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 /> identified in this document, these earlier settlement analyses are considered <br /> applicable for the current project. <br /> In support of the planned expanded Austin Road Landfill, the Report of Disposal <br /> Site Information (RDSI) and PCPCMP, R. W. Beck (1995) included an evaluation <br /> of the settlement potential of refuse and subgrade materials. As part of this <br /> work, R. W. Beck also evaluated the associated potential distress to the landfill <br /> liner system. Since the refuse loads that were anticipated by R. W. Beck are <br /> similar to those expected for the future Forward Landfill, the analyses that were <br /> completed by R. W. Beck are considered applicable for the current project. The <br /> results of this analyses are included in Appendix F. <br /> A geotechnical exploration was completed by CH2M Hill in 1992 to support <br /> stability and settlement analyses for development of the Forward Landfill. The <br /> geotechnical study included an exploratory drilling and laboratory testing <br /> • program and calculation of the consolidation potential of subgrade materials and <br /> Forward Landfill)TD 5-17 <br /> L\Allied\2000.193\R e ports\jtd:Sec-5.0:05/24/02 <br /> BRYAN A.STIRRAT 6 ASSOCIATES <br />