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• Discussion of Soil Lithology <br /> Based on the soil observed in the borings, it appears that there is limited potential for <br /> percolation in the shallow soil zones at the test locations. 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 /> Shallow percolation tests were conducted on the proposed new parcels of the Site. The <br /> soil borings discussed above were used for the percolation test holes (Plates 10-12). <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 borings were advanced by hand auger and the soils logged, the test holes <br /> were completed for the percolation tests. 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 each percolation test hole 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 July 31 through August 14, <br /> 2018. <br /> Due to initial percolation rates observed, one-hour tests were selected for Parcels 8 and <br /> 9. Water level measurements were taken every 10 minutes during this one-hour period. <br /> The tests were observed by Jeffrey Wong, Senior Registered Environmental Health <br /> Specialist at the San Joaquin County Environmental Health Department. <br /> Four-hour tests were selected for the remaining parcels. Water level measurements <br /> were taken every 30 minutes during this four-hour period. The last 30 minutes of each <br /> test were observed by Maryann Beniamine, Registered Environmental Health Specialist <br /> at the San Joaquin County Environmental Health Department. <br /> • <br /> LOGE 1811 Page 6 <br />