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The surface and near surface soils located at the Site are reported by the USDA Web <br /> Soil Survey to be composed of Capay-Urban land complex (Plate 10) (USDA, 2022). <br /> The table 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 Reaction ability absorption <br /> Symbol (in) Classification mmhos/cm pH (in/hr) fields <br /> Capay, 122 0-20: Clay, CH, CL <2 6.6 - 8.4 0.06 - 0.2 Severe: <br /> 20-60: Clay, silty clay; CL, CH <2 6.6 - 8.4 0.06 - 0.2 peres <br /> Urban Land 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 September 12, 2022, Live Oak excavated a shallow soil boring near the proposed <br /> septic disposal area of the Site for the purpose of percolation testing. The boring was <br /> four inches in diameter, 3.35 feet deep, and was excavated by hand auger. The location <br /> of the boring is indicated on Plate 11. <br /> The soil to a depth of two feet below ground surface was a sandy silt with considerable <br /> amounts of gravel and construction debris mixed throughout. It appears that this <br /> surface soil has been highly disturbed by a previous owner or tenant. Live Oak <br /> excavated numerous borings to varying depths between six inches and 3.35 feet across <br /> the proposed leach field area, and encountered this mixed debris in all locations. <br /> Beneath this layer, clay was encountered to the full depth of the hole. The soil log is <br /> presented on Plate 12. <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 in the proposed septic disposal area of the <br /> Site. The soil boring discussed above was used for the percolation test hole. <br /> Percolation test procedures conformed to San Joaquin County Environmental Health <br /> Department policy. <br /> LOGE 2240 Page 7 <br />