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KLEINFELDER <br /> File No. 20-3399-01 <br /> October 5, 1990 <br /> On October 2 , 1990, a representative of our firm drilled <br /> and set-up 1 3-foot deep percolation test hole on each of <br /> the proposed parcels 1 and 2 . 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 /> into the test holes to prevent disturbance when adding <br /> water. The test holes were filled with relatively clean <br /> water and left to soak overnight. <br /> On October 3 , 1990, our representative returned to the site <br /> to perform the 3-foot deep percolation tests . As per San <br /> Joaquin County guidelines, the tests were performed for <br /> periods of from 30 minutes to 4 hours. The last 30 minutes <br /> of each test were used to calculate the percolation rates . <br /> In order to use standard leach lines, the County requires <br /> a percolation rate of 60 minutes per inch, or faster, at <br /> the 3-foot depth. The 3-foot deep tests performed passed <br /> with percolation rates of 12 minutes per inch for Parcel <br /> 1 and 13-1/2 minutes per inch for Parcel 2 . The county <br /> approved percolation test sheet is included with this <br /> report. <br /> ITEM C-3• <br /> "The depth and gradient of the groundwater table. " <br /> During our residence surveys on October 1, 1990 , we were <br /> able to measure groundwater in 4 wells. The groundwater <br /> was measured at 40 feet deep at location 1 on Plate I and <br /> from 28 to 32 feet deep at locations 2 , 3 , and 4 on Plate <br /> 3 <br />