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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 50 to 55 feet above mean sea level (Plate 4). The Site is <br /> relatively flat. <br /> Geology <br /> The Site is mapped on the Preliminary geologic map showing Quaternary deposits of <br /> the Lodi quadrangle, California (Marchand, D.E., and Atwater, B.F., 1979). It is <br /> depicted within a map unit of the Riverbank formation middle unit, described as "arkosic <br /> alluvium forming Mokelumne River terraces and alluvial fan; chiefly sand; probably <br /> glacial outwash" (Plate 5). <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 San Joaquin-Urban land complex (Plate 6). <br /> • The table 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 (in) Classification mmhos/cm <br /> Reaction ability absorption <br /> Symbol <br /> pH (in/hr) fields <br /> San 0-16 Loam; CL-ML, ML <2 5.6-6.5 0.6-2.0 Severe: <br /> Joaquin- 16-26 Clay loam, clay; CL <2 6.1-7.8 <0.06 cemented <br /> Urban Land 26-60 Indurated --- --- --- pan, peres <br /> Complex, slowly <br /> 0-2% Urban land <br /> slopes, 242 <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 areas on April 5 <br /> and 6, 2017, as part of the addendum to the Soil Suitability Study (Live Oak, 2017). <br /> The surface and near-surface soils in each hole were found to be a mixture of clay, silt, <br /> and sand. <br /> • LOGE 1836 Pae 2 <br /> 9 <br />