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L � <br /> Ground Water Depth and Gradient <br /> It appears from data provided from the San Joaquin County Flood Control and Water <br /> Conservation District that the aquifer providing the primary water source in the area lies at <br /> L .+' a depth of approximately 105 feet below the surface. However, Oakdale Irrigation district <br /> wells are much deeper—from 400 to 500 feet and undoubtedly also tap water-bearing <br /> units lower in the stratigraphic section. The piezometric surface of the ground water table <br /> slopes to the northwest, away from the Stanislaus River, which lies approximately eight <br /> miles to the south. <br /> Because of the deep ground water depth, it is difficult to determine seasonal variations in <br /> ground water elevation. However, Oakdale Irrigation District reported that the water <br /> levels vary only about three feet. The lowest levels occur during the summer months <br /> when irrigation wells are actively pumped. <br /> ri <br /> 4 <br /> h <br /> �k <br /> Western Design/David Avila 2000 34 <br />