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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 /> Capay clay, 0-20: Clay: CH, CL <2 6.6-8.4 0.06 - 0.2 Severe: <br /> 0-2% 20-60: Clay, silty clay: CL, CH <2 6.6-8.4 0.06 - 0.2 peres slowly <br /> slopes, 118 <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 March 2, 2026, Live Oak excavated a shallow soil boring on the Site for the purpose <br /> of percolation testing. The boring was four inches in diameter, 2.01 feet deep, and was <br /> excavated by hand auger. 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 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 near the proposed septic disposal area for the <br /> new ADU. 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 2612 Page 5 <br />