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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 Hollenbeck silty clay (Plate 11) (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 Reaction ability absorption <br /> Symbol (in) Classification mmhos/cm <br /> y pH (in/hr) fields <br /> Hollenbeck 0-10 Silty clay; CH, CL <2 6.6-8.4 0.06-0.2 Severe: <br /> silty clay, 0- 10-37 Clay, silty clay; CH, CL <2 6.6-8.4 0.06-02 peres slily <br /> 2% slopes, 37-42 Silty clay loam, clay <2 6.6-8.4 0.2-0.6 <br /> 173 loam; CL <br /> 42-60 Cemented --- --- --- <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 May 26, 2020, Live Oak observed the Affonsos excavate a shallow soil boring near <br /> the proposed septic disposal area of the Site for the purpose of percolation testing. The <br /> boring was 12 inches in diameter, 2.5 feet deep, and was excavated by bobcat-mounted <br /> auger. Live Oak then hand-augered the remaining approximately one foot of fh e Bole <br /> with a four-inch hand auger, to a total depth of 3.47 feet. --' <br /> The location of the boring is indicated on Plate 12. <br /> The soil in the boring was similar to that described by the Soil Survey. Clay was <br /> encountered to approximately two feet below ground surface,_ followed by silty clay to <br /> the full depth of the hole. The soil log is presented on Plate 13. <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 20-22 Page 5 <br />