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Mr. Skibo <br /> July 9, 2004 <br /> Page 6 <br /> 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> 5.1 Geology <br /> The Site is depicted on the USGS Geologic Map of the Sacramento Quadrangle(199 1) as within <br /> the Pliocene Laguna Formation.(Plate 8). This map unit consists of interbedded alluvial <br /> gravel , sand and silt. Pebbles of quartz and metamorphic rock fragment generally dominate <br /> the gravels, but the matrix are arkosic. The Laguna formation was deposited by the ancestral <br /> west-flowing Feather, Yuba, Bear and American Rivers. <br /> /5.2 Soil Properties in the Vicinity <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 Redding gravelly loam, 2-8 percent slopes and Redding gravelly <br /> loam, 8-30 percent slopes. (Plate 7) (USDA, 1992). Table 2 presents some selected properties <br /> of these soils: <br /> Table 2. <br /> Selected Soil Properties of the Surrounding Area <br /> San Joaquin County Soil Survey Report. <br /> Soil Name and Depth Unified Soil Classification SalinitySoil Septic tank <br /> Map Symbol (in) nunhos/cm Reaction absorption <br /> pH fields <br /> Redding 0.7: Gravelly loam SC,SC-SM <2 5.1-6.5 Severe: <br /> Gravelly 7-16: Gravelly loam,gravelly clay <2 5.1-6.5 cemented pan <br /> Loam,2-8% loam,Cl,Cl-ML,GC,GM-GC <br /> slopes,220. 16-22: Clay,Clay loam,CH,CL <2 5.1-6.5 <br /> 22-60: Indurated — — <br /> Redding 0-7: Gravelly loam SC,SC-SM <2 5.11.5 Severe: <br /> ` Gravelly 7-16: Gravelly loam,gravelly clay <2 5.1-6.5 cemented pan, <br /> Loam,8-30% loam,Cl,CI-ML,GC,GM-GC slope. <br /> slopes,220. 16-22: Clay,Clay loam,CH,CL <2 5.1.6.5 <br /> 22-60: Indurated — — <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> 5.3 Soil Lithology Observed and Septic Applicability <br /> Generally, the soil encountered in the borings is similar to the soils reported by the San <br />