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Soil Profile and Geologic Information <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 <br /> within a map unit of Holocene intertidal deposits, described as "marsh, swamp, and <br /> channel sediments generally at least 1 m thick; mainly peat, muck, and mud" (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 Kingile muck (Plate 7) (USDA, 2021). 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 (in) Class <br /> Reaction ability absorption <br /> Symbol Classification mmhos/cm pH (in/hr) fields <br /> Kingile 0-17 Muck; PT <2 4.5-6.5 6.0-20 Severe: <br /> muck, 17-61 Silty clay loam, clay, <2 5.6-7.8 .06-.2 subsides, <br /> partially silty clay; ML, CL wetness, <br /> drained, 0- peres slowly <br /> 2% slopes, <br /> 190 <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 February 23, 2021, Live Oak excavated a shallow soil boring near 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, 3.17 feet deep, and was excavated by hand auger <br /> (Table 2). <br /> The location of the boring is indicated on Plate 8. <br /> The soil in the boring was similar to that described by the Soil Survey. Sandy silt was <br /> encountered to approximately 1.5 feet below ground surface, followed by peat to the full <br /> depth of the hole. In the adjacent ground-water boring, peat was encountered to a <br /> depth of approximately 6.5 feet, followed by organic clay and organic sandy clay to the <br /> 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 borings, there appears to be moderate potential for <br /> percolation in the shallow soil zone at the test location. Sandy soils generally have a <br /> much greater potential for percolation than fine-grained or cemented soils. However, a <br /> percolation test is the only accepted method for determining the suitability of the soils <br /> LOGE 2110 Page 5 <br />