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` June 3, 2004 <br /> NOA Project Number: E04049A <br /> 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> L 5.1 Geology <br /> The Site is depicted on the USGS Geologic Map of the San Francisco-San Jose Quadrangle (1991) <br /> 6. as within the Quaternary Modesto Formation (Plate 8). These map units represent arkosic <br /> alluvium forming Mokelumne River terraces, channel ridges and alluvial fans. The alluvium is <br /> a tan and light-gray gravely sand, silt and clay except where derived from volcanic rocks when <br /> it is distinctly red and black with minor brown clasts. <br /> 5.2 Soil Properties in the Vicinity <br /> The surface and near surface soils located at Site are reported by the San Joaquin County Soil <br /> Survey to be composed of Jacktone clay, 0 to 2 percent slopes, and Stockton clay, 0 to 2 <br /> percent slopes (Plate 7) (USDA, 1992). Table 3 presents some selected properties of these soils: <br /> Table 3. <br /> Selected Soil Properties of the Surrounding Area <br /> San Joaquin County Soil Survey Report. <br /> Soil Name Depth(in) Unified Soil Salinity Soil Septic tank <br /> and Map Classification mmhos/cm Reaction absorption <br /> Symbol pH fields <br /> Jacktone 0-22: Clay. CL,CH. <2 6.6-8.4 Severe: <br /> clay,0-2% 22-34:Clay loam,clay,silty clay. CL,CH. <2 7.9-9.0 cemented pan, <br /> slopes, 180. 34-37:Indurated. — — — peres slowly. <br /> 37-46:Loam,clay loam. CL-ML,CL <2 7.9.9.0 <br /> 46-60:Cemented — — — <br /> Stockton 0.29:Clay. CL,CH <2 7.4-8.4 Severe:peres <br /> clay,0-2% 29-37:Clay,silty clay. CL,CH <2 7.4-8.4 slowly. <br /> ` slopes,250. 37-42:Clay loam,silty clay CL <2 7.4-8.4 <br /> loam. — — — <br /> 42-60:Cemented. <br /> r <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> L <br /> 8 <br /> '.444v <br />