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This section presents conclusions and recommendations based on the results of the <br />geotechnical analyses discussed in this report. <br />9.1 Conclusions <br />9.1.1 Slope Stability Analyses Results <br />9.1.1.1 Slope Stability under Static Conditions <br />The static global slope stability analyses for Modules 1 and 3, assuming conservative <br />shear strength parameters for the liner system, resulted in acceptable factors of safety of <br />greater than 1.5. <br />The analyses of the most critical global slope stability cross sections within Modules 4 <br />through 11 were performed assuming a minimum residual shear strength defined by a <br />friction angle of 12 degrees for the liner system. This shear strength is based on the <br />results of the CQA testing performed as part of the construction of Module 4. The results <br />show adequate factors of safety for global slope stability of Modules 4 through 11. <br />The analysis for the slope stability of the most critical interim waste slope within <br />Modules 5 through 11 was also performed assuming a minimum residual shear strength <br />defined by a friction angle of 12 degrees for the liner system. It is assumed that the <br />maximum interim waste slopes will be 3H:1 V with 20 -foot wide benches provided at 50 - <br />foot vertical spacing (i.e., an effective slope of 3.5H:1 V). The maximum waste elevation <br />is assumed to 317 feet. The static slope stability analysis yielded acceptable static factors <br />of safety. <br />9.1.1.2 Slope Stability under Seismic Conditions <br />The results of seismic analyses show that the potential for permanent displacement does <br />not exist, during the MPE event, along any of the critical cross-sections analyzed. <br />9.1.2 Structural Design of Leachate Collection Pipes <br />The calculations to check the structural integrity of existing leachate collection pipes in <br />Modules I and 4 show adequate factors of safety (against ring deflection, wall buckling, <br />wall crushing, and circumferential strain) under the increased loading from the vertical <br />Geotechnical Analyses for NCRCSL Department of Public Works/Solid Waste <br />Shaw Environmental, Inc. County of San Joaquin, December 12, 2007 <br />9-1 <br />