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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. 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 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 boring was advanced by hand auger and the soil 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 2.0-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 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 percolation test <br /> hole was found to be intact and dry. <br /> Percolation Test Procedure <br /> Live Oak conducted the percolation test for the boring on February 20, 2018. Due to <br /> initial percolation rates observed, a four-hour test was selected. Water level <br /> measurements were taken every 30 minutes during this four-hour period. Jeffrey Wong, <br /> Senior Registered Environmental Health Specialist at the San Joaquin County <br /> Environmental Health Department, observed the test. <br /> An electronic well sounder with a depth accuracy of 1/100`h 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 /> • LOGE 1806 Page 5 <br />