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Discussion of Soil Lithology <br /> /Based on the soils observed in the boring, there appears to be good potential for <br /> percolation. Sandy soils generally have a much greater potential for percolation than <br /> fine-grained or cemented soils. However, a percolation test is the only accepted <br /> method for determining the suitability of the soils for a septic disposal area. Percolation <br /> test results are discussed in the following section. <br /> Percolation Test <br /> One shallow percolation test was conducted on the Site; the shallow soil boring <br /> discussed above was used for the percolation test hole (Plate 2). Percolation test <br /> procedures conformed to San Joaquin County Environmental Health Department policy. <br /> / Preparation and Presaturation of Percolation Test Holes <br /> i/After the boring was advanced by hand auger and the soils logged, the test hole was <br /> completed for the percolation test. Approximately 2 inches of pea gravel were placed in <br /> the bottom of the open soil boring, followed by a 1.5-inch diameter PVC pipe with <br /> perforations on the bottom. Pea gravel was then used to backfill a few inches of the <br /> annular space. <br /> Live Oak presaturated the percolation test hole approximately 24 hours prior to the <br /> percolation test. The ground was also moistened from recent hearty rains days earlier. <br /> The hole was filled with water to a height of 12 inches above the bottom of the boring for <br /> the Presaturation. On the day of testing, the percolation test hole was found to be intact <br /> and dry. <br /> Percolation Test Procedure <br /> Live Oak conducted the percolation test for the boring on January 28, 2010. Due to silty <br /> sands, a four-hour test was preferred. Water level measurements were taken every <br /> half-hour during this four-hour period. Michael Escotto, Senior Registered <br /> Environmental Health Specialist at the San Joaquin County Environmental Health <br /> Department, observed the last half-hour of the test. <br /> An electronic well sounder with a depth accuracy of 11100' foot was utilized for the <br /> water level measurements. The water level was measured against a fixed reference <br /> point on the well casing. Measurements were recorded on the data sheet in decimal <br /> feet. When necessary after measuring the water level, the hole was refilled with water <br /> to an approximate level of six inches above the 'bottom of the hole. <br /> LOGE1003 Page 6 <br />