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File No. 20-3374-01 �y" n [_ FINE IL )ER <br /> July 26, 1990 <br /> ITEM C-2 • <br /> "Suitability of soil for development utilizing septic systems. " <br /> On July 16, 1990, a representative of our firm drilled and <br /> set-up 1 3-foot deep percolation test hole at each proposed <br /> parcel I of the properties. The test holes were drilled <br /> with hand drilling equipment using a 6-inch diameter <br /> continuous-flight auger. Perforated PVC pipe was inserted <br /> the entire length of the test holes to prevent disturbance <br /> when adding water. The test holes were then filled with <br /> relatively clean water and left to soak overnight. <br /> On July 17 , 1990, a representative of our firm returned to <br /> the site to perform the 3-foot deep percolation tests. As <br /> per San Joaquin County guidelines, the tests were performed <br /> for periods of 4 hours. The last 30 minutes of each test <br /> were used to calculate the percolation rates. In order to <br /> use standard leach lines, the County requires a percolation <br /> rate of 60 minutes per inch or faster at the 3-foot depth. <br /> The three 3-foot deep tests performed passed and the <br /> results are summarized in Table I, below. The county <br /> approved percolation test sheets are included with this <br /> report. <br /> 3 <br />