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from the Mokelumne and Calaveras Rivers; includes arkosic alluvium, probably glacial <br /> outwash, and locally-derived materials; chiefly fine sand and silt" (Plate 6). <br /> The surface and near surface soils located at the Site are reported by the USDA Web <br /> Soil Survey to be composed of Galt clay (Plate 7) (USDA, 2018). The table below <br /> presents some selected properties of this soil: <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 Reaction ability absorption <br /> (in) Classification mmhos/cm <br /> Symbol pH (in/hr) fields <br /> Galt clay, 0- 0-25 Clay, CL, CH <2 6.6-7.3 0.06-0.2 Severe: <br /> 1% slopes, 25-34 Clay, silty clay; CL, CH <2 6.6-8.4 0.06-0.2 cemented <br /> 160 34-60 Cemented --- --- --- pan, peres <br /> slowly. <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 /> Soil Borings <br /> On December 10, 2018, Live Oak excavated a shallow soil boring in the proposed <br /> septic disposal area of the Site for the purpose of conducting a percolation test. The <br /> boring was four inches in diameter, 3.41 feet deep, and was excavated by hand auger <br /> (Table 2). The location of the boring is indicated on Plate 8. <br /> The soil in the boring was considerably sandier than that described by the Soil Survey. <br /> Sandy clay was encountered to 1.5 feet below ground surface, followed by clayey sand <br /> to the full depth of the hole. The soil log is presented on Plate 9. <br /> Discussion of Soil Lithology <br /> Based on the soil observed in the boring, there appears to be some potential for <br /> percolation. Sandy soils generally have a much greater potential for percolation than <br /> 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 /> Percolation Test <br /> A shallow percolation test was conducted in the proposed septic disposal area of the <br /> Site. The soil boring discussed above was used for the percolation test hole (Plate 9). <br /> Percolation test procedures conformed to San Joaquin County Environmental Health <br /> Department policy. <br /> LOGE 1847 Page 4 <br />