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Soil Borings <br /> On March 4, 2020, Live Oak excavated a shallow soil boring on each proposed parcel <br /> of the Site for the purpose of conducting percolation tests. The borings were four <br /> inches in diameter, 3.44 and 3.38 feet deep, and were excavated by hand auger (Table <br /> 2). The locations of the borings are indicated on Plate 13. <br /> The soil in the borings was similar to that described by the Soil Survey. Clay was <br /> encountered to 2.8 feet below ground surface, followed by silty clay to the full depth of <br /> each 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 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 /> Shallow percolation tests were conducted on each proposed parcel of the Site. The soil <br /> borings discussed above were used for the percolation test holes. Percolation test <br /> procedures conformed to San Joaquin County Environmental Health Department policy. <br /> Preparation and Presaturation of Percolation Test Holes <br /> After the borings were advanced by hand auger and the soil logged, the test holes were <br /> completed for the percolation testing. Approximately two inches of pea gravel were <br /> placed in the bottom of each 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 /> Live Oak presaturated the percolation test holes approximately 24 hours prior to the <br /> percolation testing. Each hole was filled with water to a height of 12 inches above the <br /> bottom of the boring for the presaturation. On the day of testing, the holes were found <br /> to be intact and dry. <br /> Percolation Test Procedure <br /> Live Oak conducted the percolation testing for the borings on March 6, 2020. Based on <br /> the initial water drop observed, one-hour tests were selected. Water level <br /> measurements were taken every ten minutes during this one-hour period. The last 30 <br /> minutes of each test were observed by Sukhreet Kaur, Registered Environmental <br /> Health Specialist at the San Joaquin County Environmental Health Department. <br /> LOGE 20-08 Page 5 <br />