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Soil Profile and Geologic Information <br /> S5� <br /> The Site is depicted on the Preliminary Geologic Map Showing Quaternary Deposits of <br /> the Lodi Quadrangle, California (Marchand and Atwater, 1979). The Site is depicted on <br /> a map unit of the Modesto Formation upper member. The unit represents "arkosic <br /> alluvium forming Mokelumne River terraces and alluvial fan; chiefly sand with minor <br /> gravel and silt; probably glacial outwash" (Plate 7). <br /> The surface and near surface soils located at the Site are reported by the USDA Web <br /> Soil Survey to be composed of Tokay fine sandy loam, 0 to 2 percent slopes (Plate 8) <br /> (USDA, 2009). The table below presents some selected properties of this soil: <br /> Table 1. Selected Properties of Onsite Soils (USDA, 1992) <br /> Soil Name Depth Unified Soil Salinity Soil Perme- Septic tank <br /> and Map Reaction ability absorption <br /> (in) Classification mmhoslcm <br /> Symbol pH (In/hr) fields <br /> Tokay fine 0-19: Fine sandy loam; SM <2 6.1-7.8 2.0-6.0 Slight <br /> sandy loam, 1945: Fine sandy loam, sand <2 6.1-7.8 2.0-6.0 <br /> - <br /> 0-2% loam; SM Y <br /> slopes, <br /> 256 45-60: Fine sandy loam, sandy <2 6.1-8.4 2.0-6.0 <br /> loam coarse sandy <br /> loam; SM <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 /> Soil Borings <br /> On June 2, 2010, Live Oak excavated one shallow soil boring on the Site for the z� <br /> purpose of conducting a percolation test. The boring was four inches in diameter, 3.5 <br /> feet deep, and was excavated by hand auger. The boring location is indicated on Plate CS <br /> 2. <br /> The soil in the borings was within the range of what would be anticipated based on the <br /> Soil Survey data reviewed. The log for the soil boring is presented in Plate 9. 3� <br /> Discussion of Soil Lithology <br /> Based on the soils observed in the boring, there appears to be moderate potential for <br /> percolation. Sandy soils generally have a much greater potential for percolation than <br /> 2, fine-grained or cemented soils. However, a percolation test is the only accepted <br /> method for determining the suitability of the soils for a septic disposal area. Percolation <br /> test results are discussed in the following section. <br /> LOGE1013 Page 5 <br />