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June 4, 2004 <br /> NOA Project Number: E04065A <br /> i <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 /> L as within the Pleistocene Riverbank Formation (Plate 8). This map unit consists of reddish <br /> gravel, sand, and silt forming alluvial terraces. <br /> ift 5.2 Soil Properties in the Vicinity <br /> The surface and near surface soils located at the Site are reported by the San Joaquin County <br /> 6' Soil Survey to be composed of San Joaquin loam,thick surface, 0 to 2 percent slopes, with a <br /> small area of Bruella sandy loam, 0 to 2 percent slopes (Plate 7) (USDA, 1992). Table 3 <br /> ` 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 /> LSoil Name Depth(in) Unified Soil Salinity Soil Septic tank <br /> and Map Classification mmhos/cm Reaction absorption <br /> ` Symbol pH fields <br /> ` Bruella sandy 0-18:Sandy loam. SC-SM,SM. <2 6.1-7.3 Fair:too <br /> loam,0-2% 18-31:Sandy clay loam,sandy SC. <2 6.1-7.3 clayey. <br /> slopes, 111. loam. <br /> 31-67:Sandy clay loam,clay SC,CL <2 6.1-7.3 <br /> loam. <br /> ` San Joaquin 0.12:Loam. CL-ML,ML. <2 5.6-6.5 Poor: <br /> loam,thick 12-26:Sandy clay loam. SC <2 6.1-7.3 cemented pan, <br /> surface,0-2% 26-35:Clay loam,clay. CL <2 6.1-7.8 too clayey. <br /> slopes,240. 35-60:Indurated. — — — <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> 5.3 Soil Lithology Observed and Septic Applicability <br /> r. <br /> Generally,the soil encountered in the borings is similar to the soils reported by the San <br /> Joaquin County Soil Survey for the area (USDA, 1992). Soil conditions were found to be <br /> comparable at the two locations. Table 4 presents the soil log for the percolation test holes. <br /> k <br /> 7 "004 <br />