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Discussion of Soil Lithology <br />Based on the soil observed in the boring, there appears to be some potential for <br />percolation in the shallow soil zone. Sandy soils generally have a much greater <br />potential for percolation than fine-grained or cemented soils. However, a percolation <br />test is the only accepted method for determining the suitability of the soils for a septic <br />disposal area. Percolation test results are discussed in the following section. <br />Percolation Test <br />A shallow percolation test was conducted at the test location. The soil boring discussed <br />above was used for the percolation test hole. Percolation test procedures conformed to <br />San Joaquin County Environmental Health Department policy. <br />Preparation and Presaturation of Percolation Test Holes <br />After the boring was advanced by hand auger and the soil logged, the 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 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 presatu ration. On the day of testing, the hole was found to <br />be intact and dry. <br />Percolation Test Procedure <br />Live Oak conducted the percolation test for the boring on March 24, 2022. Based on <br />the soil type present, a standard four-hour test was selected. Water level <br />measurements were taken every 30 minutes during the four-hour period. The last 30 <br />minutes of the test were observed by Frank Girardi, Registered Environmental Health <br />Specialist at the San Joaquin 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 hole was refilled with water <br />to a level of approximately six inches above the bottom of the hole. <br />LOGE 2219 Page 6