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Soil Borings <br /> On December 14, 2020, Live Oak excavated a shallow soil boring near the septic <br /> replacement area of the Site for the purpose of conducting a percolation test. The <br /> boring was four inches in diameter, 3.45 feet deep, and was excavated by hand auger <br /> (Table 2). <br /> The location of the boring is indicated on Plate 10. <br /> The soil in the boring was less clayey than that described by the Soil Survey. Road <br /> base was encountered to approximately six inches, followed by fine sandy silt to the full <br /> depth of the hole. The soil log is presented on Plate 11. <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 near the proposed septic replacement area of <br /> the 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 /> The percolation test hole was presaturated approximately 24 hours prior to the <br /> percolation testing. The 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 hole was found to <br /> be intact and dry. <br /> Percolation Test Procedure <br /> Live Oak conducted the percolation test for the boring on December 18, 2020. A <br /> standard four-hour test was selected. Water level measurements were taken every 30 <br /> LOGE 20-60 Page 7 <br />