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• <br />6.0 CONCLUSIONS AND RECOMMENDATIONS <br />EMCON s conclusions and recommendations are presented below. <br />. 6.1 MAXIMUM PROBABLE EARTHQUAKE <br />The seismic investigation indicates that the MPE and peak ground acceleration <br />could result from earthquakes occurring on the Bear Mountain fault 'zone. For <br />this fault, the MPE magnitude is 5.7 and the peak horizontal ground acceleration <br />anticipated at the site associated with the MPE is 0.1 Og. <br />6.2 LIQUEFACTION POTENTIAL <br />Because the ground -water table at the proposed site is deep, 125 to 150 feet <br />below ground surface, and the foundation soils are medium dense to dense, the <br />potential for liquefaction of the foundation soils is considered highly unlikely. <br />6.3 SLOPE STABILITY <br />6.3.1 Static Conditions <br />The stability analyses of the excavation slope, refuse moving face, and final <br />grading of the proposed landfill with maximum slopes of 12 percent indicate that <br />calculated safety factors are 1.6 to 6.3 for static conditions and exceed the mini- <br />mum acceptable value of 1.5. <br />6.3.2 Seismic Conditions <br />Yield accelerations of 0.15g to 0.45g are calculated for MPE seismic loading re- <br />sulting in negligible permanent displacement of the landfill slopes. <br />Because clay liner strength data were not available, EMCON recommends future <br />laboratory testing of representative clay liner soil samples to confirm soil <br />strengths used in the stability analyses. <br />PJ9 9390217.00W 14 Rev. 0 May 23, 1989 <br />