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PHYSICAL SETTING <br /> Topography <br /> The elevation of the Site, according to a United States Geological Survey topographic <br /> map, is approximately 36 to 37 feet above mean sea level (Plate 3). The Site is <br /> relatively flat. <br /> Geology <br /> The Site is mapped on the Preliminary geologic map of Cenozoic deposits of the Bellota <br /> Quadrangle, California (Marchand and Bartow, 1979). It is depicted within a map unit of <br /> the Modesto formation upper member, described as "foothill-derived alluvial silt, clay <br /> and minor sand forming terraces, upper fans, and forming distributaries across lower <br /> fans; abundant volcanic detritus" (Plate 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 Galt clay (Plate 5). The table below presents <br /> 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 pH (in/hr) fields <br /> Galt clay, 0- 0-25 Clay; CL, CH <2 6.6-7.3 0.06-0.2 Severe: <br /> 1% slopes, 25-34 Clay, silty clay; CL, CH <2 6.6-8.4 0.06-0.2 cemented <br /> 160 34-60 Cemented --- --- --- pan, peres <br /> slowly. <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 June 6, <br /> 2018. The surface and near-surface soils were found to be sandy, fat clay. <br /> LOGE 1832 Page 2 <br />