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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 Mw 7.9 associated with the San Andreas Fault at a distance of <br /> about 70 miles; and a M,, 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 (Mw) 7.9 <br /> Peak Horizontal Bedrock Acceleration 0.09 g <br /> Duration of Significant Shaking (D5-95) 45.4 sec <br /> Great Valley Fault Event Magnitude (MW) 6.7 <br /> Peak Horizontal Bedrock Acceleration 0.13 g <br /> Duration of Significant Shaking (Ds-vs) 15.3 sec <br /> 5.3.2.2 GROSS STABILITY ANALYSES <br /> • <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 Q. Because the actual interface strengths of landfill <br /> liner materials will vary with the manufacturers of particular products used, a <br /> parametric analysis was done to develop a range of acceptable strength <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 /> • <br /> Forward Landfill)TD 5-14 <br /> L:\Allied\2000.193\Reports\td:Sec-5.0:05/24/02 <br /> BRYAN A.BTIRRAT&ABBOCIATEB <br />