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October 23, 2009 Page 4 of 10 <br /> Our Project Number: LGS0090518 <br /> 4.0 GEOLOGIC AND SOIL PROFILE INFORMATION <br /> The Site is depicted on the California Geologic Survey Map of the Sacramento Quadrangle as <br /> within the Quaternary Modesto Formation (Qm). This unit consists of Undifferentiated alluvial <br /> deposits, mainly arkosic, forming toe of the Mokelumne alluvial fan, generally covered by 0.3 to <br /> 1.0 meters of Holocene intertidal deposits. (Plate 5, Appendix A). <br /> The surface and near surface soils located at the Site are reported by the San Joaquin County <br /> Soil Survey to be composed of Devries sandy loam (149) drained with 0-2% slopes, Guard clay <br /> loam (169) drained with 0-2% slopes, and Rioblancho (226), and Tokay fine sandy loam (256) <br /> with 0-2% slopes. (Plate 6, Appendix A) (USDA, 1992). The table below presents some <br /> selected properties of these soils: <br /> Table 1 <br /> San Joaquin County Soil Survey <br /> Elected Soil Properties of On-Site Soils <br /> Salinity Soil Perm <br /> Soil Name Depth e- Septic tank <br /> and Map (in) Unified Soil Classification mmhos Reaction ability absorption <br /> symbol /cm pH (in/hr) fields <br /> Devries 0-13 Sandy loam; SM <2 6.6-8.4 2.0-6.0 Severe: <br /> sandy loam, 13-28 Sandy loam, fine sandy loam; <2 6.6-8.4 2.0-6.0 Cemented Pan <br /> drained, 0- SM <br /> 2% slopes <br /> 149 28-80 Indurated --- <br /> Guard clay 0-15 Clay loam; CL <2 7.9-8.4 .2-.6 Severe: <br /> loam, 15-72 Clay loam, sandy clay loam; <2 7.9-8.4 .06-.2 wetness, peres <br /> drained, 0- SC, CL slowly <br /> 2% slopes, <br /> 169 <br /> Rioblancho 0-16 Clay loam; CL <2 7.4-8.4 0.2-0.6 Severe: <br /> 226 16-28 Loam, Clay loam; CL-ML, CL <2 7.4-8.4 0.2-0.6 cemented pan, <br /> peres slowly <br /> 28-39 Sandy loam, loam, silt loam; <2 7.9-8.4 0.6-2.0 <br /> SC-SM, SM, CL-ML, ML <br /> 39-80 Cemented <br /> Tokay fine 0-19 Fine sandy loam; SM <2 6.1-7.8 2.0-6.0 Slight <br /> sandy loam, 19-45 Fine sandy loam, sandy loam; <2 6.1-7.8 2.0-6.0 <br /> 0-2 % slope SM <br /> 256 45-60 Fine sandy loam, sandy loam <br /> coarse sandy loam; SM <2 6.1 8.4 2.0 6.0 <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> * See description of the map unit for composition and behavior characteristics of the map unit <br /> 902 Industrial Way•Lodi.CA 95240.209.367.3701 • Fax 209.369.4228 02009 Neil O.Anderson&Associates,Inc <br />