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Soil Profile and Geologic Information <br /> The Site is mapped on the Preliminary geologic map showing Quatemary deposits of <br /> the Lodi quadrangle, California (Marchand and Atwater, 1979). It is depicted within a <br /> map unit the Modesto Formation upper member, described as "arkosic alluvium forming <br /> Mokelumne River alluvial fan; chiefly sand... 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 (Plate 8) (USDA, 2014). The <br /> table below presents some selected properties of this soil: <br /> Table 1. Selected Properties of On-Site Soil (USDA, 1992) <br /> Soil Name Depth Unified Soil Salinity Soil Perme- Septic tank <br /> and Map (in) Clas mmhos/cm <br /> Reaction ability absorption <br /> Symbol <br /> pH (in/hr) fields <br /> Tokay fine r45-6O <br /> Fine sandy loam; SM <2 6.1-7.8 2.0-6.0 Slight <br /> sandy loam, Fine sandy loam, sandy <2 6.1-7.8 2.0-6.0 <br /> 0-2% loam; SM <br /> slopes, Fine sandy loam, sa y <2 6.1-8.4 2.0-6.0 <br /> 256 loam, coarse san <br /> loam; SM <br /> Note:The table descrip 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 January 23, 2014, Live Oak excavated one shallow soil boring on each parcel of the <br /> Site for the purpose of conducting percolation tests (two tests total). The borings were <br /> four inches in diameter, 3.30 and 3.35 feet deep, and were excavated by hand auger <br /> (Table 2). The locations of the borings are indicated on Plate 9. I� <br /> The soil in the borings was similar to that described by the Soil Survey. Sandy silt was <br /> encountered to the full depth of both borings. The log for the soil borings is presented in <br /> Plate 10. <br /> Discussion of Soil Lithology <br /> Based on the soils observed in the borings, there appears to be moderate potential for <br /> percolation in the test location. Sandy soils generally have a much greater potential for <br /> percolation than fine-grained or cemented soils. However, a percolation test is the only <br /> accepted method for determining the suitability of the soils for a septic disposal area. <br /> Percolation test results are discussed in the following section. <br /> LOGE 1401 Page 5 <br />