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5.3.6 Minimum Refuse Elevation <br />The lowest elevation of refuse at the landfill is anticipated to be 180 feet MSL (Table 2), <br />approximately three feet above the base of excavation (Figure 5). lei}: <br />5.3.7 Minimum Five -Foot Separation to Groundwater <br />The minimum separation between groundwater and refuse is approximately 140 ft, <br />which is exceeds the minimum reaulatory reauirement of five feet (Table 3). <br />This estimate includes the effect of capillary rise, which is dependent upon the pore size <br />of the soil. Capillary rise is greatest in fine grained soils such as clay. Clays can have a <br />capillary rise of 80 centimeters up to several meters. Coarser materials such as silts or <br />sandy silts can have a capillary rise of up to a meter. Clean sands may have a capillary <br />rise of only 20 to 50 centimeters. Gravel and sand/sandstone are the predominant soil <br />types at that elevation (Appendix ;'E). The sandstone is described as weakly or <br />moderately cemented so the pore size would be smaller than that of clean sand, but <br />likely not as small as the pore size of clay, <br />Based on the information given, the maximum capillary rise at the site is estimated to be <br />ane meter (3.25 feetZ <br />Foothill Sanitary Landfill ____,._________ Paae 47 Public Works/Solid Waste <br />Joint Technical Document County of San Joaouin —Revised 7/30/10 <br />