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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 /> Tujunga 0-22: Loamy sand; SW-SM, <2 6.1-7.3 6.0-20 Severe: <br /> loamy sand, SM, SP-SM poor filter <br /> 0-2% 22-67: Loamy sand, fine sand, <2 6.1-7.8 6.0-20 <br /> slopes, sand; SW-SM, SM, SP- <br /> 259 SM <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 11, 2019, Live Oak excavated a shallow soil boring adjacent to the existing <br /> septic disposal area of the Site for the purpose of conducting a percolation test. The <br /> boring was four inches in diameter, 3.17 feet deep, and was excavated by hand auger <br /> (Table 2). <br /> The location of the boring is indicated on Plate 13. <br /> The soil in the boring was similar to that described by the Soil Survey. Silty, fine sand <br /> was encountered to the full depth of the hole. The soil log is presented on Plate 14. <br /> Discussion of Soil Lithology <br /> Based on the soil observed in the boring, there appears to be good 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 adjacent to the existing septic disposal area <br /> of the Site. The soil boring discussed above was used for the percolation test hole <br /> (Plate 13). Percolation test procedures conformed to San Joaquin County <br /> 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 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 /> LOGE 1912 Page 7 <br />