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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 /> Boggiano 0-23: Clay loam; CL <2 6.6 - 7.8 0.2 - 0.6 Moderate: <br /> clay loam, 23-48: Loam, clay loam, silt <2 7.4 - 7.8 0.6 -2.0 flooding, <br /> 0-2% loam; CL-ML, CL cemented <br /> slopes, 48-60: Cemented; --- --- --- --- pan, peres <br /> 110 - 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 August 28, 2019, Live Oak excavated a shallow soil boring near the proposed septic <br /> disposal area of the Site for the purpose of conducting a percolation test. The boring <br /> was four inches in diameter, 3.18 feet deep, and was excavated by hand auger (Table <br /> 2). 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. Sandy clay was <br /> encountered to approximately 29 inches depth, followed by cemented sandy clay to the <br /> 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 /> 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 /> placed in the bottom of the open soil boring, followed by a 2.0-inch diameter PVC pipe <br /> with perforations on the bottom. Pea gravel was then used to backfill a few inches of <br /> the annular space. <br /> LOGE 1942 Page 6 <br />