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septic disposal areas. The borings were four inches in diameter, 3.10 and 3.18 feet <br /> deep, and were excavated by hand auger (Table 2). <br /> 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. On the northern <br /> parcel, silty fine sand was encountered to the full depth of the boring. On the southern <br /> parcel, silty organic clay was encountered to the full depth of the boring. The soil logs <br /> are presented on Plates 14 and 15. <br /> Discussion of Soil Lithology <br /> Based on the soil observed in the borings, there appears to be good potential for <br /> percolation in the shallow soil zone of the northern parcel, but limited potential for <br /> percolation in the shallow soil zone of the southern parcel. Sandy soils generally have a <br /> much greater potential for percolation than fine-grained or cemented soils. However, a <br /> percolation test is the only accepted method for determining the suitability of the soils <br /> for a septic disposal area. Percolation test results are discussed in the following <br /> section. <br /> Percolation Test <br /> A shallow percolation test was 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, each 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 /> 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 tests for the borings on May 29, 2019. Based on <br /> initial percolation rates observed, four-hour tests were selected. Water level <br /> measurements were taken every 30 minutes during the four-hour period. The last 30 <br /> LOGE 1926a Page 5 <br />