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Discussion of Soil Lithology <br />Based on the soil observed in the boring, there appears to be good 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 in the proposed septic disposal area of the <br />Site. The soil boring discussed above was used for the percolation test hole. <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 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 presaturation. 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 April 5, 2022. A standard <br />four-hour test was selected; however, due to a reading in which the hole went dry, the <br />test was converted into ten-minute readings for the last half-hour. Water level <br />measurements were taken every 30 minutes for the first 3.5 hours, then every 10 <br />minutes during the final half-hour. The last 30 minutes of the test were observed by <br />Frank Girardi, Registered Environmental Health Specialist at the San Joaquin County <br />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 2221 Page 6 <br />