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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 />Exeter 0-26: Sandy loam; SM, SC- <2 6.1-7.3 0.6-2.0 Severe: <br />sandy loam, SM cemented <br />0-2% 26-33: Sandy clay loam, clay <2 6.6-7.8 0.6-2.0 pan, percs <br />slopes, 157 loam, loam; CL, SC slowly <br />33-60: Indurated <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 15, 2021, Live Oak excavated a shallow soil boring near the proposed <br />septic disposal area of the Site for the purpose of conducting a percolation test. The <br />boring was four inches in diameter, 2.27 feet deep, and was excavated by hand auger <br />(Table 2). <br />The location of the boring is indicated on Plate 11. <br />The soil in the boring was similar to that described by the Soil Survey. Sandy silt was <br />encountered to 1.5 feet below ground surface, followed by sandy clay to the full depth of <br />the hole. The 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 moderate 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 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 />Preparation and Presaturation of Percolation Test Holes <br />After the boring was advanced by hand auger and the soil logged, the test hole was <br />completed for the percolation testing. Approximately two inches of pea gravel were <br />LOGE 2148 Page 5