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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 <br /> y pH (in/hr) fields <br /> Archerdale 0-8: Clay loam, CL <2 6.6 - 7.3 0.2 - 0.6 Severe: <br /> clay loam, 8-35: Clay loam, clay, silty <2 6.6 - 7.3 0.06 - 0.2 peres slowly <br /> 0-2% clay loam; CL, CH <br /> slopes, 107 35-60: Clay loam, clay, silty <2 6.6 - 7.3 0.06 - 0.2 <br /> clay loam, CL, CH <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 November 15, 2016, Live Oak excavated one shallow soil boring on the Site for the <br /> purpose of conducting a percolation test. The boring was four inches in diameter, 3.02 <br /> feet deep, and was excavated by hand auger. The location of the boring is indicated on <br /> Plate 9. <br /> The soil in the boring was similar to that described by the Soil Survey. Clayey silt with <br /> sand was encountered to a depth of 1.7 feet, followed by sandy silt with clay to the full <br /> depth of the hole. The log for the soil boring is presented in Plate 10. <br /> • Discussion of Soil Lithology <br /> Based on the soil observed in the boring, there appears to be moderate potential for <br /> percolation. Sandy soils generally have a much greater potential for percolation than <br /> fine-grained or cemented soils. However, a percolation test is the only accepted <br /> method for determining the suitability of the soils for a septic disposal area. Percolation <br /> test results are discussed in the following section. <br /> Percolation Test <br /> One shallow percolation test was conducted on the Site; the shallow soil boring <br /> discussed above was used for the percolation test hole (Plate 9). Percolation test <br /> procedures conformed to San Joaquin County Environmental Health 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 test. Approximately 2 inches of pea gravel were placed in <br /> the bottom of the open soil boring, followed by a 2.0-inch diameter PVC pipe with <br /> perforations on the bottom. Pea gravel was then used to backfill a few inches of the <br /> annular space. <br /> • LOGE 1628 Page 5 <br />