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KLEINFELDER <br /> File No. 20-2949-15 <br /> December 14 , 1990 <br /> inch diameter continuous-flight auger. Perforated PVC <br /> pipe was inserted into the test hole to prevent <br /> disturbance when adding water. The test hole was filled <br /> with relatively clean water and left to soak overnight. <br /> On December 6, 1990, our representative returned to the <br /> site to perform the 3-foot deep pe.7rrla.tion test. As per <br /> San Joaquin County guidelines, the test was performed <br /> for a period of 4 hours. The last 30 minutes of the test <br /> were used to calculate the percolation rate. In order <br /> to use standard leach lines, the County requires a <br /> percolation rate of 60 minutes per inch, or faster, at <br /> the 3-foot depth. The 3-foot deep test performed passed <br /> with a percolation rate of 9-1/2 minutes per inch. 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 December 10, 1990, we <br /> were able to measure groundwater in 2 wells (locations <br /> 4 and 6 on Plate I) . The groundwater was measured at 10 <br /> and 8 feet below existing ground surface at locations 4 <br /> and 6, respectively. Regional groundwater maps <br /> published by the San Joaquin County Flood Control and <br /> Water Conservation District, Plate II, indicate the <br /> depth to groundwater in this area was approximately 10 <br /> feet in the spring of 1990. <br /> Copyright 1990 Kleinfelder, Inc. 3 <br />