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- -- --- - '� KLEI NFELDER <br /> File No. 20-2982-02 <br /> July 20, 1990 <br /> ITEM C-3• <br /> "The depth and gradient of the groundwater table. " <br /> During our residence surveys on June 28, 1990, we were <br /> able to measure groundwater in 2 wells. The groundwater <br /> was measured at 128 and 130 feet below existing ground <br /> surface. Regional groundwater maps published by the San <br /> Joaquin County Flood Control and Water Conservation <br /> District, Plate II, indicate groundwater in this area was <br /> approximately 130 to 140 feet below existing ground <br /> surface in the fall of 1989 . <br /> We note that a natural drainage channel runs <br /> approximately east to west through the site. We <br /> recommend that current flood maps be reviewed prior to <br /> construction on the site to determine if there is any <br /> risk of flooding in this area. <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. We are <br /> providing a general estimate of the main groundwater <br /> gradient based on the published maps. Based on the <br /> groundwater map showing lines of equal elevation of <br /> groundwater, Plate III, we conclude that the main <br /> groundwater gradient is in roughly the south direction. <br /> 4 <br />