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File No. 20-2949-10 L.4 0 <br /> i L Luttt <br /> July 26, 1990 HE , <br /> J U L 3 0 1990 <br /> r_NVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> approximately 3 feet. San Joaquin County requires a <br /> percolation rate of 60 minutes per inch or faster be <br /> obtained at the 3 feet depth for standard leach field use. <br /> Based on this criteria, all four of the 3 feet deep tests <br /> passed. The specific test results and county approved test <br /> sheets were included in our March 15, 1990 report. <br /> ITEM C-3 • <br /> "The depth and gradient of the groundwater table. " <br /> During our residence visits on July 16, 1990, we were able <br /> to measure groundwater in 4 wells . Groundwater was <br /> measured at depths varying from 19 and 21 feet (locations <br /> 5 and 6 , respectfully) to 126 feet (location 3) below <br /> existing ground surface. In an additional well, no water <br /> was measured to a depth of 150 feet. <br /> Regional groundwater maps published by San Joaquin County <br /> Flood Control and Water Conservation District, Plate II , <br /> do not provide groundwater depth contours for this area. <br /> However, we note that the west side of San Joaquin County <br /> contains several groundwater aquifers, from approximately <br /> 40 to 50 feet deep to over 600 feet deep. The wells <br /> measured were drilled to depths varying from 210 feet to <br /> 950 feet. In our opinion, the dry well was likely due to <br /> sealing of the upper water-bearing stratas within the well , <br /> and the groundwater measured at 19 and 21 feet deep were <br /> likely due to seepage from a recently irrigated adjacent <br /> field. Two of the residences visited reported drawdowns <br /> of the water in their wells after prolonged use for <br /> irrigation. <br /> 3 <br />