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• PHYSICAL SETTING <br /> TTo o_ ra h <br /> The elevation of the Site, according to a United States Geological Survey topographic <br /> map, is approximately 55 feet above mean sea level (Plate 3). The Site is relatively flat. <br /> Geology <br /> The Site is mapped on the Geologic map of the San Francisco-San Jose quadrangle <br /> (Wagner et al., 1991). It is depicted within a map unit of the Modesto formation (Plate <br /> 4). <br /> Soil Analysis <br /> Chemical and Physical Properties of the Soil <br /> The surface and near surface soils located at the Site are reported by the Web Soil <br /> Survey (USDA, 2018) to be composed of Jacktone clay (Plate 5). The table below <br /> presents some selected properties of this soil type: <br /> Table 1. Selected Properties of On-Site Soils (USDA, 1992) <br /> • Soil Name Depth Unified Soil Salinity Soil Perme- Septic tank <br /> and Map Reaction ability absorption <br /> Symbol (in) Classification mmhos/cm <br /> Y pH (in/hr) fields <br /> Jacktone 0-22 Clay; CL, CH <2 6.6-8.4 0.06-0.2 Severe: <br /> clay, 0-2% 22-34 Clay loam, clay, silty <2 7.9-9.0 0.06-0.2 cemented <br /> slopes, clay; CL, CH pan, peres <br /> 180 34-37 Indurated --- --- --- slowly <br /> 37-46 Loam, clay loam, CL- <2 7.9-9.0 0.2-0.6 <br /> ML, CL <br /> 46-60 Cemented --- --- --- <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. See description of the map unit for <br /> composition and behavior characteristics of the map unit. <br /> Live Oak inspected the on-site soil near the proposed new residential area on March 20, <br /> 2018. The surface and near-surface soils were found to be fat clay. <br /> • LOGE 1818 Page 2 <br />