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k3, KLEINUFLI)LR <br /> File No. 20-3389-01 <br /> September 24 , 1990 <br /> passed. The county approved percolation test sheets are <br /> included with this report. <br /> ITEM C-3 • <br /> "The depth and gradient of the groundwater table. " <br /> During our surveys on August 29, 1990, we were not able to <br /> measure groundwater as none of the residences or the school <br /> contained wells. Regional groundwater maps published by <br /> the San Joaquin County Flood Control and Water Conservation <br /> District, Plate II, do not indicate the depth to <br /> groundwater in this area. Therefore, we drilled 2 test <br /> borings on September 19, 1990 at the approximate locations <br /> shown on Plate I to measure groundwater. Groundwater was <br /> measured at approximately 6 feet deep in Boring B-1 and <br /> approximately 7-1/2 feet deep in Boring B-2 at the time of <br /> drilling. The borings were backfilled with bentonite on <br /> September 21, 1990 and at that time groundwater was <br /> measured at approximately 5 feet 8 inches deep in Boring <br /> B-1 and approximately 5 feet 9 inches deep in Boring B-2 . <br /> Based on County requirements for a small parcel split <br /> projects, we are not required to establish an on-site <br /> groundwater gradient by drilling test borings. The County <br /> groundwater map showing lines of equal elevation of <br /> groundwater, Plate III, does not cover the site area. <br /> However, it appears that the main groundwater gradient <br /> could be in roughly the northeast direction. <br /> 4 <br />