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E <br />GeoSyntec Consultants <br />displacements using the modified Newmark [1965] method and charts developed by <br />Makdisi and Seed [1978]. <br />The slope stability analysis was perforined for a 2H: 1V slope with a drainage layer <br />and a 3H:1V slope without a drainage layer. Based on the results of the analysis, the <br />proposed final cover design will have a long term, static factor of safety of 1.5 and is <br />calculated to have less than 2 -in. (50 -mm) of final cover displacement during the design <br />seismic event. The actual materials used in construction must meet or exceed the <br />assumed material properties listed in Table 3-2. The results of the analysis are <br />summarized in Table 3-3 and presented in Appendix E. <br />Table 3-3 <br />Final Cover Slope Stability Results <br />Prescriptive Final Cover <br />WMU B, Forward Landfill <br />Notes: 1) Reported seismic displacement is upper bound value per Makdisi & Seed [1978] for <br />Richter magnitude 7.5 earthquake. <br />2) N/A = not applicable <br />3.4.3 CQA Activities <br />(C) construction quality assurance methods pursuant to §§20323 & 20324; <br />The construction quality assurance (CQA) plan for construction of the WMU B <br />final cover system is included in Appendix C. This CQA plan is consistent with <br />previous CQA plans used in the construction of base lining systems at the Forward <br />Landfill. <br />J:WLLIED\FORWARD\CLOSUREPLAN\REPORT 3-12 99.11.30 <br />I* <br />Estimated <br />Loading <br />Factor of <br />Seismic <br />Side Sloe <br />Case '' <br />Safett <br />k <br />Dis lacementl <br />2H:1V <br />Static <br />1.5 <br />--- <br />(with <br />Seismic <br />--- <br />0.20g <br />< 2 -in. <br />drainage <br />(k,,,.=0.28g) <br />layer) <br />Static <br />2.2 <br />--- <br />--- <br />Static T <br />1.2 <br />--- <br />--- <br />3H:1 V <br />(full saturated_1 _ft veg. layer) <br />Seismic (k,„a„=0.28g) <br />--- <br />0.34g <br />N/A <br />(k > k..) <br />Notes: 1) Reported seismic displacement is upper bound value per Makdisi & Seed [1978] for <br />Richter magnitude 7.5 earthquake. <br />2) N/A = not applicable <br />3.4.3 CQA Activities <br />(C) construction quality assurance methods pursuant to §§20323 & 20324; <br />The construction quality assurance (CQA) plan for construction of the WMU B <br />final cover system is included in Appendix C. This CQA plan is consistent with <br />previous CQA plans used in the construction of base lining systems at the Forward <br />Landfill. <br />J:WLLIED\FORWARD\CLOSUREPLAN\REPORT 3-12 99.11.30 <br />I* <br />