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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 but good potential for percolation in the deep soil <br /> zone. Sandy soils generally have a much greater potential for percolation than fine- <br /> grained or 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 /> Percolation Test <br /> One shallow percolation test was conducted on each parcel of the Site. The soil borings <br /> discussed above were used for the percolation test holes (Plate 9). 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, the test holes were <br /> completed for the percolation testing. 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 holes 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, each hole was found <br /> to be intact and dry. <br /> Percolation Test Procedure <br /> Live Oak conducted the percolation tests for the borings on February 22, 2019. Four- <br /> hour tests were selected. Water level measurements were taken every 30 minutes <br /> during the four-hour period. The last 30 minutes of each test were observed by <br /> Naseem Ahmed, Registered Environmental Health Specialist at the San Joaquin <br /> County Environmental Health Department. <br /> An electronic well sounder with a depth accuracy of 1/100th 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 holes were refilled with water <br /> to a level of six inches or more above the bottom of the hole. <br /> LOGE 1907 Page 6 <br />