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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 100 to 105 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 the Tracy Quadrangle, San <br /> Joaquin County, California (Diblee, 1981). It is depicted within a map unit of Holocene <br /> alluvium (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 Zacharias clay loam (Plate 5). The table <br /> below 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 pH (in/hr) fields <br /> Zacharias 0-19 Clay loam; CL <2 6.1-7.3 0.2-0.6 Severe: <br /> clay loam, 19-53 Clay loam, loam; CL <2 6.6-7.8 0.2-0.6 peres slowly <br /> 0-2% 53-60 Gravelly clay loam, <2 6.6-8.4 0.2-0.6 <br /> slopes, gravelly loam, GC, CL <br /> 281 <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 <br /> September 14, 2018. The surface and near-surface soils were found to be sandy, <br /> organic clay. <br /> Mass Transport Soil Properties <br /> The soil type will allow limited infiltration of water through the surface soils. <br /> LOGE 1840 Page 2 <br />