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• PHYSICAL SETTING Topography The elevation of the Site, according to a United States Geological Survey topographic map, is approximately 43 feet above mean sea level (Plate 3). The Site is relatively flat. Geology The Site is mapped on the Preliminary geologic map showing Cenozoic deposits of the Bellota quadrangle, California (Marchand and Bartow, 1979). It is depicted within a map unit of the Modesto formation lower member, described as "basin alluvium derived from the Mokelumne and Calaveras Rivers; includes arkosic alluvium, probably glacial outwash, and locally-derived materials; chiefly fine sand and silt" (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, 2019) to be composed of Stockton clay (Plate 5). The table below presents some selected properties of this soil type: • Table 1. Selected Properties of On-Site Soils (USDA, 1992) Soil Name Soil Perme- Septic tank Depth Unified Soil Salinity and Map (in) Classification mmhos/cm Reaction ability absorption Symbol pH (in/hr) fields Stockton 0-29: Clay, CL, CH <2 7.4-8.4 0.14-0.16 Severe: clay, 0-2% 29-37: Clay, silty clay, CL, CH <2 7.4-8.4 0.14-0.16 peres slowly slopes, 250. 37-42: Clay loam, silty clay <2 7.4-8.4 0.14-0.17 loam, CL 42-60: 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. Live Oak inspected the on-site soil near the proposed new residential area on January 17, 2018. The surface and near-surface soils were found to be silty clay with sand. Mass Transport Soil Properties The soil type will allow limited infiltration of water through the surface soils. • LOGE 1902 Page 2