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Table 1. Selected Properties of On -Site Soils (USDA, 1992) <br />Soil Name <br />Depth <br />Unified Soil <br />Salinity <br />Soil <br />Perme- <br />Septic tank <br />and Map <br />(in) <br />Classification <br />mmhos/cm <br />Reaction <br />ability <br />absorption <br />Symbol <br />pH <br />(in/hr) <br />fields <br />Hollenbeck <br />0-10 <br />Silty clay; CH, CL <br /><2 <br />6.6-8.4 <br />0.06-0.2 <br />Severe: <br />silty clay, 0- <br />10-37 <br />Clay, silty clay; CH, CL <br /><2 <br />6.6-8.4 <br />0.06-02 <br />peres slowly <br />2% slopes, <br />37-42 <br />Silty clay loam, clay <br /><2 <br />6.6-8.4 <br />0.2-0.6 <br />173 <br />loam; CL <br />42-60 <br />Cemented <br />--- <br />--- <br />--- <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 14, 2022, Live Oak excavated a shallow soil boring near the proposed <br />septic disposal area of each new parcel the Site for the purpose of conducting <br />percolation tests. The borings were four inches in diameter, 2.56 and 2.67 feet deep, <br />and were excavated by hand auger (Table 2). <br />The locations of the borings are indicated on Plate 11. <br />The soil in the borings was similar to that described by the Soil Survey. On Parcel 1, <br />clay was encountered to 2.0 feet below ground surface, followed by partially cemented <br />clayey silt with sand to the full depth of the hole. On Parcel 2, clay was encountered to <br />2.0 feet below ground surface, followed by sandy clay to 2.6 feet, followed by cemented <br />silty sand to the full depth of the hole. The soil logs are presented on Plates 12 and 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 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 />for a septic disposal area. Percolation test results are discussed in the following <br />section. <br />Percolation Test <br />A shallow percolation test was conducted in the proposed septic disposal area of each <br />parcel of the Site. The soil borings discussed above were used for the percolation test <br />holes. Percolation test procedures conformed to San Joaquin County Environmental <br />Health Department policy. <br />LOGE 2208 Page 5 <br />