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L <br /> LFebruary 16,2005 <br /> NOA Project Number: E040149A <br /> L 4.0 GROUND WATER INFORMATION <br /> L4.1 Ground Water Depth and Gradient <br /> The San Joaquin County Flood Control and Water Conservation District (1998 and 1999) ground <br /> water depth and elevation maps were reviewed to determine the ground water levels near the Site. <br /> LThe Fall 1998 and Spring 1999 maps are the most current maps available from the county. <br /> Fffamination of these maps indicates that no water level data is available for the Tracy/Banta area, <br /> Lwhich includes the Site,and no comments as to depth or gradient flow direction can be made. <br /> No ground water was encountered by the staff of Neil O. Anderson&Associates, Inc. during the <br /> drilling of the percolation test holes to a depth of 3 feet on January 27, 2005. <br /> 4.2 Potential Ground Water Contamination Issues <br /> L Identifying potential ground-water contamination sources was not part of the scope of work for the <br /> soil suitability study. <br /> 6 Potential ground-water contamination can occur from a number of sources which often include <br /> leaky underground storage tanks, agricultural activities, dairies, septic systems,and storm water <br /> Linfiltration. Any past agricultural activities and the present use of septic systems in the area should <br /> be considered potential ground-water contamination sources. <br /> L4.3 Water Sample Location <br /> No permits were found for the property during file review at EHD on December 2, 2005. <br /> LNo water sample was taken because no wells exist on the property. <br /> L 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> I The Site is depicted on the Preliminary Geologic Map of Cenozoic Deposits of the Tracy <br /> 6' Quadrangle, California (1981),as within a region of Quaternary Alluvium. The unit is one of <br /> poorly sorted gravel, sand silt and clay (Plate 3). <br /> The surface and near surface soils located at the Site are reported by the San Joaquin County Soil Suwcy <br /> to be composed of El Solyo clay loam, 0-2 percent slopes and Stormar clay loam, 0-2 percent slopes <br /> L (Plate 4) (USDA, 1992). Table 3 presents some selected properties of the soils: <br /> L <br /> L 5 '-44 <br /> L <br />