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Table 1. Selected Properties of On-Site Soils (USDA, 1992) <br />Soil Name <br />and Map <br />Symbol <br />Depth Unified Soil <br />(in) Classification <br />Salinity <br />mmhos/cm <br />Soil Perme- Septic tank <br />Reaction ability absorption <br />pH (in/hr) fields <br />Delhi loamy 0-16 Loamy sand; SM <2 6.1-7.8 6.0-20 Severe: <br />sand, 0-2% 16-26 Loamy sand, loamy fine <2 6.1-7.8 6.0-20 poor filter <br />slopes, 142 sand; SM <br />26-60 Sand, loamy sand, fine <2 6.1-7.8 6.0-20 <br />sand; SP-SM, 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 May 13, 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, 3.03 feet deep, and was excavated by hand auger (Table <br />2). 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 to <br />medium sand was encountered to the full depth of the hole. The soil log is presented <br />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 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 1924 Page 5