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KLLINFLLDEK <br /> File No. 2182-25 <br /> June 13, 1990 <br /> could not be obtained. Regional groundwater maps <br /> published by the San Joaquin County Flood Control and <br /> Water Conservation District, Plate IV, indicate <br /> groundwater in this area was approximately 130 to 140 <br /> feet below existing ground surface in the fall of 1989 . <br /> We note that a natural drainage channel runs <br /> approximately southeast to northwest through the site. <br /> Several of the long-time residents indicated that in the <br /> 1950 ' s and 1970 ' s the low areas of the site flooded. <br /> Modern day flood control measures likely would prevent <br /> future flooding; however, current flood maps should be <br /> reviewed prior to construction on the site. <br /> Based on County requirements, due to the main groundwater <br /> level below 65 feet deep, we are not required to <br /> establish an on-site groundwater gradient. However, we <br /> did drill one test boring to a depth of 65 feet in the <br /> lower drainage channel area to confirm groundwater <br /> conditions . No groundwater was encountered, and the Log <br /> r of Test Boring is presented on Plate III . All soils have <br /> been classified according to the Unified Soil <br /> Classification System, Plate III . <br /> We are providing a general estimate of the main <br /> groundwut.:er gradient based on the published maps . Based <br /> on the groundwater map showing lines of equal elevation <br /> of groundwater, Plate V, we conclude that the main <br /> 5 <br />