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yield acceleration of 0.09g. The nearest seismic fault is the Stockton Fault (Figure <br />13). From this we conclude that there would not be movement of the refuse mass in <br />case of the MPE. <br />5.3.5 Maximum Height <br />The maximum height of the refuse fill is 432 feet MSL. The County may seek to <br />raise the permitted height limit, subject to regulatory approval. A height increase will <br />require revision of the Preliminary Closure/Post Closure Maintenance Plan. <br />The County recognizes that a discussion of the intent to request a permit height <br />increase in this JTD does not constitute a request or application for that permit <br />revision. <br />5.3.6 Minimum Refuse Elevation <br />The lowest elevation of refuse at the landfill is anticipated to be 180 feet MSL <br />s(Table 2), approximately three feet above the base of excavation (Figure 5). <br />5.3.7 Minimum Five -Foot Separation to Groundwater <br />The minimum separation between groundwater and refuse is approximately 140 ft, <br />which exceeds the minimum regulatory requirement of five feet (Table 3). <br />This estimate includes the effect of capillary rise, which is dependent upon the pore <br />size of the soil. Capillary rise is greatest in fine grained soils such as clay. Clays <br />can have a capillary rise of 80 centimeters up to several meters. Coarser materials <br />such as silts or sandy silts can have a capillary rise of up to a meter. Clean sands <br />may have a capillary rise of only 20 to 50 centimeters. Gravel and sand/sandstone <br />are the predominant soil types at that elevation (Appendix E). The sandstone is <br />described as weakly or moderately cemented so the pore size would be smaller <br />than that of clean sand, but likely not as small as the pore size of clay. <br />0 <br />Foothill Sanitary Landfill Page 20 of 57 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — Revised 7/30/10 <br />