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5.3.2.1 SEISMICITY <br /> An assessment of the seismic exposure for the Forward Landfill site was <br /> completed by GeoSyntec Consultants (2001) and is included in Appendix E. <br /> Based on that assessment, two potential earthquake events were considered for <br /> design: a MCE of Mme, 7.9 associated with the San Andreas Fault at a distance of <br /> about 70 miles; and a MW 6.7 earthquake associated with the Great Valley Fault <br /> at a distance of about 21 miles. The following parameters were used in the <br /> seismic slope stability evaluations: <br /> San Andreas Fault Event Magnitude (M,„) 7.9 <br /> Peak Horizontal Bedrock Acceleration 0.09 g <br /> Duration of Significant'ShaVing (D5-91) 45.4 sec <br /> Great Valley Fault Event Magnitude (M„,) 6.7 <br /> Peak Horizontal Bedrock Acceleration 0.13 g <br /> Duration of Significant Shaking (D,9S) 15.3 sec <br /> 5.3.2.2 GROSS STABILITY ANALYSES = <br /> The gross stability of the landfill and liner system was assessed using the <br /> maximum slope height and slope gradient for the proposed landfill development <br /> (Figures 1 and 2 of Appendix-E). Because the actual_interface strengths of landfill <br /> liner materials will vary with the manufacturers of particular products used, a <br /> parametric analysis was dome to develop a range of acceptable streagth <br /> parameters (i.e. combination of cohesion and angle of friction) that will provide a <br /> minimum static factor of safety of 1.5. The following range of parameters were <br /> used in the analysis: <br /> Forward Landfill)TD 5-14 <br /> L:\AI I ied\2000.193\Reports\finaljtd:Sec-5.0:08/22/01 <br /> HQYAN A S3TIOOAT= ossOC1ATES <br />