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Table 1. Selected Properties of On-Site Soils (USDA, 1992) <br />Soil Name <br />and Map <br />Symbol <br />Depth Unified Soil <br />(in) Classification <br />Salinity <br />mmhos/cm <br />Soil Perme- Septic tank <br />Reaction ability absorption <br />pH (in/hr) fields <br />Tokay fine 0-19 Fine sandy loam; SM <2 6.1-7.8 2.0-6.0 Slight <br />sandy loam, 19-45 Fine sandy loam, sandy <2 6.1-7.8 2.0-6.0 <br />0-2% loam; SM <br />slopes, 45-60 Fine sandy loam, sandy <2 6.1-8.4 2.0-6.0 <br />256 loam, coarse sandy <br />loam; SM <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 July 27, 2020, Live Oak excavated shallow and deep soil borings near the potential <br />future septic disposal area of the Site for the purpose of percolation testing. The <br />borings were four inches in diameter, 3.18 and 9.88 feet deep, and were excavated by <br />hand auger. The location of the borings is indicated on Plate 11. <br />The soil in the borings was similar to that described by the Soil Survey. Sandy silt was <br />encountered to approximately 2 feet below ground surface, followed by silty sand to 5 <br />feet below ground surface, followed by sand with silt to the full depth of the hole. The <br />soil log is presented on Plate 12. <br />Discussion of Soil Lithology <br />Based on the soil observed in the boring, there appears to be good potential for <br />percolation in the shallow and deep soil zones. Sandy soils generally have a much <br />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 and deep percolation test was conducted in the potential future septic <br />disposal area of the Site. The soil borings discussed above were used for the <br />percolation test holes. Percolation test procedures conformed to San Joaquin County <br />Environmental Health Department policy. <br />LOGE 20-33 Page 6