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File No. 20-3121-02 <br /> August 25, 1989 <br /> Page 3 <br /> In our geotechnical report dated November 2, 1988, groundwater was not <br /> encountered. In order to comply with this requirement, three test borings <br /> were drilled on August 2, 1989 to depths of 35 to 40 feet. Logs of the three <br /> test borings are attached on Plates III through V and the locations are shown <br /> on Plate I. At the time the holes were drilled groundwater was measured at <br /> depths of 31 to 32 feet below the existing ground surface. In order to <br /> establish groundwater gradient, the ground surface at the boring locations was <br /> measured using survey equipment. Presented below is a summary of the <br /> survey information and groundwater readings. Since gradient only was desired, <br /> we selected as a datum of 0.0 feet the ground level at Boring 11. <br /> Groundwater Elevation Based on <br /> Depth Below Ground Surface Elevation <br /> Location Ground Surface of 0.01 at Boring 11 <br /> Boring 11 -321 -321 <br /> Boring 12 -31.31 -30.31 <br /> Boring 13 -311 -29.61 <br /> Based on our field measurements, we conclude that the groundwater gradient <br /> is generally in the northwest direction which is in agreement with the <br /> Regional Groundwater Map of Fall 1988 prepared by the San Joaquin County <br /> Flood Control and Water Conservation District. <br /> KLEINFELDER 2825 East Myrtle Street, Stockton, CA 95205 (209) 948-1345 <br />