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Soil Profile and Geologic Information <br /> The Site is depicted on the Preliminary geologic map of showing Quaternary deposits of <br /> the Lodi quadrangle, California (Marchand and Atwater, 1979). The Site is depicted <br /> within a map unit of Holocene alluvium described as "channel, levee, and floodplain <br /> deposits; chiefly silt and clay with fine sand along principal drainageways" (Plate 9). <br /> The surface and near surface soils located at the Site are reported by the USDA Web <br /> Soil Survey to be composed of Sailboat silt loam (Plate 10) (USDA, 2020). The table <br /> below 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 (in) Class <br /> Reaction ability absorption <br /> Symbol Classification mmhos/cm pH (in/hr) fields <br /> Sailboat silt 0-8: Silt loam; CL-ML, ML <2 6.1-7.3 0.6-2.0 Severe: <br /> loam, 8-23: Stratified sandy loam to <2 6.6-7.8 0.2-0.6 peres slowly <br /> drained, 0- silty clay loam; CL-ML, <br /> 2% slopes, CL <br /> 234 23-61: Stratified sandy clay <2 7.4-8.4 0.2-0.6 <br /> loam to silty clay loam, <br /> CL <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 August 19, 2020, Live Oak excavated a shallow soil boring near the proposed septic <br /> disposal area of the Site for the purpose of conducting a percolation test. The boring <br /> was four inches in diameter, 3.42 feet deep, and was excavated by hand auger (Table <br /> 2). <br /> The location of the boring is indicated on Plate 11. <br /> The soil in the boring was similar to that described by the Soil Survey. Silty sand was <br /> encountered to a depth of 2.5 feet, followed by silty organic clay to the full depth of the <br /> hole. The soil log is presented on Plate 12. <br /> Discussion of Soil Lithology <br /> Based on the soil observed in the boring, there appears to be some potential for <br /> percolation in the shallow soil zone. Sandy soils generally have a much greater <br /> LOGE 20-36 <br /> Page 5 <br />