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percolation than fine-grained or cemented soils. However, a percolation test is the only <br /> accepted method for determining the suitability of the soils for a septic disposal area. <br /> Percolation test results are discussed in the following section. <br /> Percolation Test <br /> Shallow percolation tests were conducted near the proposed septic disposal area of the <br /> Site. The soil borings discussed above were used for the percolation test holes. <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 borings were advanced by hand auger and the soils logged, the test holes <br /> were completed for the percolation tests. 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. The holes were filled with water to a height of 12 inches above the <br /> bottom of the borings for the presaturation. On the day of testing, all three holes were <br /> found to be intact and dry. <br /> Percolation Test Procedure <br /> Live Oak conducted the percolation tests for the borings on February 19, 2020. Due to <br /> initial percolation rates observed, one four-hour test and two one-hour tests were <br /> selected. Water level measurements were taken every 30 minutes during the four-hour <br /> test, and every ten minutes during the one-hour tests. The last 30 minutes of each test <br /> were observed by Daria Afonskaia, Registered Environmental Health Specialist at the <br /> 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 six inches or more above the bottom of the hole. <br /> Percolation Test Results <br /> The completed percolation test forms are included in Appendix 2 of this report. The <br /> forms were signed by Ms. Afonskaia and indicate a percolation rate for each hole based <br /> on the final water drop observed. <br /> LOGE 1947 Page 6 <br />