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Table 1. Selected Properties of On-Site Soils (USDA, 1992) <br /> Soil Name Deth Unified Soil SalinitSoil Perme- Septic tank <br /> py <br /> and Map Reaction ability absorption <br /> Symbol (in) Classification mmhos/cm pH (in/hr) fields <br /> Jacktone 0-22 Clay; CL, CH <2 6.6-8.4 0.06-0.2 Severe: <br /> clay, 0-2% 22-34 Clay loam, clay, silty <2 7.9-9.0 0.06-0.2 cemented <br /> slopes, clay; CL, CH pan, peres <br /> 180 34-37 Indurated --- --- --- slowly <br /> 37-46 Loam, clay loam, CL- <2 7.9-9.0 0.2-0.6 <br /> ML, CL <br /> 46-60 Cemented --- --- --- <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> See description of the map unit for composition and behavior characteristics of the map unit. <br /> Soil Borings <br /> On July 20, 2015, Live Oak excavated shallow and deep soil borings on the Site for the <br /> purpose of conducting percolation tests. The borings were four inches in diameter, c„ <br /> 3.25, 3.30, 7.25, and 7.50 feet deep, and were excavated by hand auger. The locations <br /> of the borings, near the septic disposal areas of each duplex, are indicated on Plate 9. ( � <br /> The soil in the borings was within the range of what would be anticipated based on the <br /> �.. Soil Survey data reviewed. At both percolation test locations, sandy clay was <br /> elfl:x nterred to a depth of three feet, followed by clayey sand to a depth of six feet. 5 '> <br /> Silty, fine sous encountered for the remainder of each boring. The log for the soil <br /> rin - ented in Plate 10. <br /> Discussion of Soil Lithology <br /> Based on the soil observed in the borings, there appears to be moderate potential for <br /> percolation of the surface soils, and moderate to good potential for percolation of the <br /> deep soils. 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 /> Two shallow and two deep percolation tests were conducted on the Site; the soil c.2 <br /> borings discussed above were used for the percolation test holes (Plate 9). Percolation <br /> test procedures conformed to San Joaquin County Environmental Health Department <br /> policy. <br /> �" LOGE 1515 Page 5 <br />