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Soil Profile and Geologic Information <br /> The Site is depicted on the Geologic and geophysical maps of the Stockton 30' x 60' <br /> quadrangle, California (Delattre, et al., 2023) as within a map unit of undivided <br /> Holocene fan deposits (Plate 11). <br /> The surface and near surface soils located at the Site are reported by the USDA Web <br /> Soil Survey to be composed of Capay clay (USDA, 2026) (Plate 12). The table below <br /> presents some selected properties of this soil type: <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 /> Capay clay, 0-20: Clay; CH, CL 4 - 8 6.6 -8.4 0.06 - 0.2 Severe: <br /> saline-sodic, peres slowly <br /> 0-2% slopes, 20-44: Clay, silty clay; CH, CL 4 - 8 7.9-9.0 0.06 - 0.2 <br /> 120 <br /> 44-60: Silty clay loam, clay 4 - 8 7.9-9.0 0.06 - 0.2 <br /> loam; 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 February 5, 2026, Live Oak excavated a shallow soil boring on the Site for the <br /> purpose of percolation testing. The boring was four inches in diameter, 2.20 feet deep, <br /> and was excavated by hand auger. The location of the boring is indicated on Plate 13. <br /> The soil in the boring was similar to that described by the Soil Survey. Silty clay was <br /> encountered to the full depth of the hole. The soil log is presented on Plate 14. <br /> Discussion of Soil Lithology <br /> Based on the soil observed in the boring, there appears to be limited potential for <br /> percolation in the shallow soil zone. Sandy soils generally have a much greater <br /> potential for percolation than fine-grained or cemented soils. However, a percolation <br /> test is the only accepted method for determining the suitability of the soils for a septic <br /> disposal area. Percolation test results are discussed in the following section. <br /> Percolation Test <br /> A shallow percolation test was conducted near the proposed septic disposal area for the <br /> new modular home. The soil boring discussed above was used for the percolation test <br /> LOGE 2606 Page 5 <br />