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FORWARD LANDFILL <br /> NON-WATER CORRECTIVE ACTION PLAN <br /> is only applicable, however, if the seismic displacements are less than the displacement needed <br /> to trigger residual strength parameters along the interface(which is the case for all the interfaces <br /> analyzed for the site). <br /> 4.1.5.3 Dynamic Refuse Prism Stability Anal <br /> Static slope stability analysis was not performed for this analysis since the performance of the <br /> slopes under dynamic conditions was required by Title 27, Section 22101. Conventional <br /> dynamic (pseudo-static) stability analyses for the refuse fill slopes were performed on the five <br /> constructed cross sections using the SLOPE/W(Geo-Slope, 2007) computer program. The <br /> approximate locations of the cross sections are presented in Figure 2. <br /> Seismic-induced permanent displacements due to the MCE were estimated using procedures <br /> described by Bray et. al., (1998), and Bray and Rathje (1998). The procedure is based on the <br /> methods described by Newmark(1965) for determining displacement of a rigid block resting on <br /> a sliding plane subjected to earthquake-type motions. The procedure is based on the premise that <br /> the sliding block will undergo displacement only during the periods when the maximum ground <br /> acceleration(k,,,ax) exceeds the yield acceleration(ky) for the sliding block, (i.e., displacements <br /> occur when kmax is greater than ky). Bray and Rathje (1998) refined the procedure for waste fills <br /> to incorporate the dynamic response characteristics of the sliding block, and intensity and <br /> duration of ground motions at the site during the MCE. <br /> The site design seismic parameters used in the analysis were derived from GLA (2008a and <br /> 2008b) and are summarized below: <br /> Maximum Credible Earthquake Design Characteristics <br /> Earthquake Magnitude M=6.7 on the Great Valley 7 Fault:20.4 miles(31.9km)from the site <br /> Maximum Site Acceleration 0.15g(for the MCE) <br /> Duration of Significant Shaking 14 sec.(Bray et.al., 1998) <br /> Mean Period of Shaking,T. 1 0.53 sec. for Magnitude 6.7 earthquake(Bray et.al., 1998) <br /> For the present evaluation, the following MSW material parameters were used: <br /> Dynamic Refuse(MSW)Fill Characteristics <br /> Height of Refuse Fill Varies with cross section <br /> Average Shear Wave Velocity 600 to 705 ft./sec.(varies with fill height based on research by <br /> Bray,et.al., 1998) <br /> M:12011-01Z&NWFA REPORT.DOCX 13 Geo-Logic Associates <br />