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PHYSICAL SETTING Topography The elevation of the Site, according to a United States Geological Survey topographic map, is approximately 80 feet above mean sea level (Plate 3). The Site is relatively flat. Geology The Site is mapped on the Geologic map of the San Francisco-San Jose quadrangle, California (Wagner, et al., 1991). It is depicted within a map unit of the Modesto formation (Plate 4). Soil Analysis Chemical and Physical Properties of the Soil The surface and near surface soils located at the Site are reported by the Web Soil Survey (USDA, 2018) to be composed of Chuloak coarse sandy loam, Delhi loamy sand, and Timor loamy sand (Plate 5). The table below presents some selected properties of these soil types: Table 1. Selected Properties of On-Site Soils (USDA, 1992) Soil Name Depth Unified Soil Salinity Soil Perme- Septic tank and Map Reaction ability absorption Symbol (in) Classification mmhos/cm pH (in/hr) fields Chuloak 0-19 Coarse sandy loam, SM <2 5.6-6.5 2.0-6.0 Severe: coarse 19-44 Sandy clay loam, sandy <2 6.1-7.3 0.2-0.6 peres slowly sandy loam, loam, SC-SM, SC 0-2% 44-55 Fine sandy loam, SM <2 6.6-7.3 2.0-6.0 slopes, 127 55-64 Loamy coarse sand, SM <2 6.6-7.3 6.0-20 Delhi loamy 0-16 Loamy sand; SM <2 6.1-7.8 6.0-20 Severe: sand, 0-2% 16-26 Loamy sand, loamy fine <2 6.1-7.8 6.0-20 poor filter slopes, 142 sand; SM 26-60 Sand, loamy sand, fine <2 6.1-7.8 6.0-20 sand; SP-SM, SM Timor loamy 0-14 Loamy sand; SM <2 6.6-7.8 6.0-20 Severe: sand, 0-2% 14-56 Loamy sand, loamy <2 7.4-8.4 6.0-20 poor filter slopes, 254. coarse sand; SM 56-60 Cemented --- --- --- Note: The table descriptions do not necessarily reflect site-specific soil properties. See description of the map unit for composition and behavior characteristics of the map unit. LOGE 1844 Page 2