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0 n <br /> the soils for a septic disposal area. Percolation test results are discussed in the <br /> following section. <br /> percolation Test <br /> One shallow percolation test was conducted on the Site; the soil boring discussed <br /> above was used for the percolation test hole (Plate 2). Percolation test procedures <br /> conformed with San Joaquin County Environmental Health Department policy. <br /> The proposed drain field area was moved to a different location after the percolation test <br /> was completed; however, the drain field is still within 100 feet of the percolation test, as <br /> allowed by the San Joaquin County Environmental Health Department. Additionally, <br /> based on our experience in the area and the soil and geologic maps consulted, we do <br /> not believe the soil will vary significantly in the immediate area. <br /> Preparation and Presaturation of Percolation Test Holes <br /> /Afterthe 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 /> LOGE presaturated the percolation test hole approximately 24 hours prior to the <br /> percolation test. 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 presaturated hole <br /> was found to be intact and dry. <br /> Percolation Test Procedure <br /> LOGE conducted the percolation test for the boring on June 25, 2009. Due to initial <br /> percolation rates observed, a four-hour test was required. Water level measurements <br /> were'taken every half-hour during this four-hour period. Lisa Medina, Senior Registered <br /> Environmental Health Specialist at the San Joaquin County Environmental Health <br /> Department, observed the last half-hour of the test. <br /> A measuring stick was utilized for the water level measurements. The stick was <br /> inserted to the bottom of the hole, and the wet portion of the stick was measured as the <br /> water, column height. Measurements were recorded on the data sheet to quarter inch <br /> accuracy. When necessary after measuring the water level, the hole was refilled with <br /> water to a level of six inches above the bottom of the hole. <br /> LOG E0911 Page 6 <br />