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• Soil Profile and Geologic Information <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 map units of <br /> the Riverbank Formation upper and middle units and the Turlock Lake Formation. The <br /> Riverbank Formation upper and middle units are described as "foothill-derived alluvial <br /> sand and silt," and the Turlock Lake Formation is described as "arkosic alluvium, <br /> probably glacial outwash in part... chiefly sand with some silt and minor gravel' (Plate <br /> 7). <br /> The surface and near surface soils located at the Site are reported by the Web Soil <br /> Survey (USDA, 2016) to be composed of Montpellier-Cometa complex, San Joaquin <br /> sandy loam, and San Joaquin loam (Plate 8). The table below presents some selected <br /> properties of these soils: <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 Reaction ability absorption <br /> Symbol pH (in/hr) fields <br /> Montpellier- Montpellier: <br /> Cometa 0-20: Coarse sandy loam; SM <2 5.6 -7.3 2.0 -6.0 Severe: <br /> complex, 5- 20-43: Sandy clay loam; SC <2 5.6 -7.3 0.2 -0.6 peres slowly <br /> • 8% slopes, 43-55: Coarse sandy loam; SM <2 6.6 -7.3 0.2 -0.6 <br /> 200 55-60: Sandy loam, coarse <2 6.1 -7.3 <0.06 <br /> sandy loam; SM <br /> Cometa: <br /> 0-22: Sandy loam; SM, SC- <2 5.6 -6.5 0.6 -2-0 Severe: <br /> SM peres slowly <br /> 22-36: Sandy clay, clay, clay <2 6.1 -7.3 <0.06 <br /> loam; CL, CH <br /> 36-60: Stratified sandy loam to <2 6.6 - 7.3 <0.06 <br /> sandy clay loam; SM, <br /> SC-SM, Sc <br /> San 0-10: Sandy loam; SM <2 5.6-6.5 0.6-2.0 Severe: <br /> Joaquin 10-20: Clay loam, clay; CL <2 6.1-7.8 <0.06 cemented <br /> sandy loam, 20-60: Indurated --- --- --- pan, peres <br /> 2-5% slowly <br /> slopes, <br /> 237 <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 /> loam, 2-8% 26-60: Indurated --- --- --- pan, peres <br /> slopes, slowly <br /> eroded <br /> 239 <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 /> LOGE 1621 Page 5 <br />