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Live Oak GeoEnvironmental conducted a deep percolation test near the proposed <br /> septic disposal areas of the Site on October 23, 2020. The soil boring discussed below <br /> was used for the percolation test hole. Percolation test procedures conformed to San <br /> Joaquin County Environmental Health Department policy. <br /> Soil Boring <br /> On October 21, 2020, Live Oak excavated a shallow soil boring near the proposed <br /> septic disposal areas of the Site for the purpose of conducting a percolation test. The <br /> boring was four inches in diameter, 7.45 feet deep, and was excavated by hand auger <br /> (Table 2). <br /> The location of the boring is indicated on Plate 11. <br /> The soil in the boring was similar to that described by the Soil Survey. Clay was <br /> encountered to a depth if 3.5 feet, followed by clay with sand to a depth of 6.0 feet, <br /> followed by sandy clay to a depth of 7.0 feet, followed by silty sand to the full depth of <br /> the hole. The soil log is presented on Plate 12. <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, but good potential in the deep soil zone. Sandy <br /> soils generally have a much greater potential for percolation than fine-grained or <br /> cemented soils. However, a percolation test is the only accepted method for <br /> determining the suitability of the soils for a septic disposal area. Percolation test results <br /> are discussed in the following section. <br /> Preparation and Presaturation of Percolation Test Holes <br /> After the deep boring was advanced by hand auger and the soil logged, the test hole <br /> was 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 /> Live Oak presaturated the percolation test hole 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 /> LOGE 20-63 Page 6 <br />