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place hydraulic conductivities on the order of 10-6 to 10-' cm/sec. These same <br /> soils had remolded hydraulic conductivities as low as 10-9 cm/sec. The <br /> remaining soils consisted of cemented silty sand/silty sandstone with in-place <br /> hydraulic conductivities on the order of 10-3 cm/sec and remolded hydraulic <br /> conductivities between 10-4 to 10-5 cm/sec (Appendix D). <br /> During a Geologic Investigation (Kleinfelder 1990), seven soil borings (B-1 <br /> through B-7) were advanced to depths ranging from 30 to 65 feet in the east, <br /> southeast, and southern areas of the site. The soils encountered in the seven <br /> borings consisted of cemented clay/claystone, cemented silt/siltstone, and <br /> cemented sand/sandstone with in-place hydraulic conductivities ranging from <br /> 10-3 to 10-5 cm/sec. Remolded soils had hydraulic conductivities ranging from <br /> 10-4 to 10-6 cm/sec. The results of the laboratory testing are tabulated in a <br /> report dated January 2, 1991 (Appendix E). <br /> 4.10.2.2 Groundwater <br /> Groundwater flows generally north-to south at the site at a depth of between <br /> 60 and 40 ft MSL with gradient from north to south (Figure 12). Groundwater <br /> elevations fluctuate seasonally less than one foot. <br /> 4.10.2.3 Creeks <br /> A seasonal creek is present at the east side of the site. In the winter months, <br /> this creek flows into a stormwater pond. United States Geological Survey <br /> (USGS) topographic maps do not indicate springs located within 1-mile of site <br /> (KA, 1985). <br /> 4.10.2.4 Springs <br /> There are no springs on the property. <br /> i <br /> i <br /> Foothill Sanitary Landfill Page 14 of 57 Public Works/Solid Waste I <br /> Joint Technical Document County of San Joaquin—Revised 7/30/10 <br /> i <br /> 3 <br /> 3 <br /> I <br />