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KLEINFELDER <br /> File No. 20-3450-01 <br /> February 8 , 1991 <br /> adding water. The test holes were filled with relatively <br /> clean water and left to soak overnight. <br /> On February 6, 1991, our representative returned to the <br /> site to perform the 3-foot deep percolation tests. As <br /> per San Joaquin County guidelines, the tests were <br /> performed for a period of 4 hours. The last 30 minutes <br /> of each test were used to calculate the percolation <br /> rates. In order to use standard leach lines, the County <br /> requires a percolation rate of 60 minutes per inch, or <br /> faster, at the 3-foot depth. The 3-foot deep tests <br /> performed passed with percolation rates of 9-1/2 and 11 <br /> minutes per inch, for parcels 1 and 2 , respectively. The <br /> County approved percolation test sheet is included with <br /> this report. <br /> ITEM C-3• <br /> "The depth and gradient of the groundwater table. " <br /> During our residence surveys on February 5, 1991, we were <br /> able to measure groundwater in 5 wells. The groundwater <br /> was measured at approximately 37 feet below existing <br /> ground surface in 2 on-site wells and at approximately <br /> 33 to 34 feet in 3 wells on adjacent properties. The <br /> regional groundwater depth map published by the San <br /> Joaquin County Flood Control and Water Conservation <br /> District, Plate II, indicates the depth to groundwater <br /> in this area was approximately 35 to 40 feet in Spring <br /> 1990 . <br /> Copyright 1991 Kleinfelder, Inc. 3 <br />