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r <br /> J. H. KLEINFELDER &ASSOCIATES <br /> Three site-wide potentiometric surface maps have been constructed from <br /> ground water levels measured to the nearest 0.01 foot on Figure 11 <br /> (1986), Figure 12 (9 June 1987), and Figure 13 (25 June 1987)• The ground <br /> water levels were measured by a Kleinfelder geologist using an electric <br /> tape. These measurements were subtracted from the top of the monitoring <br /> well casing elevation (referenced to mean sea level) to obtain the surface <br /> elevation of ground water. These ground water elevations are then <br /> contoured (lines of equal elevation) to estimate the flow direction and <br /> hydraulic gradient. <br /> i <br /> Water levels measured during 1986, from exii± ;. well locations MW-1, <br /> M4I-2, and M4-3 indicated the direction to be oximately east with a j <br /> hydraulic gradient (measured between MW-2 ann - MW-3) of 0.33 percent <br /> (Figure 11). <br /> Water levels measured on 9 ,Tune 1987, from existing well locations MW-1, <br /> -?, MW-3, MW-4, MW-5, and MW-6 indicates the direction to be <br /> approximately south with a hydraulic gradient (measured between MW-1 and <br /> MW-2) of 0.8 percent (Figure 12). <br /> Water levels measured on 25 June 1987, from existing well locations MW-1, <br /> MW-2, MW-3, MW-4, MW-5, and MW-6 indicate the direction to be <br /> approximately south with a hydraulic gradie.Lt (measured between MW-1 and <br /> MW-•2) of 0.83 percent. <br /> Recently obtained information (July 1987) suggests that an agricultural <br /> viell located approximately 1/4 to 1/2 miles southwest of the project <br /> proper*' (Delta college) may be influencing the direction and gradient of <br /> grour.: ater flow within the uppermost water-bearing unit (Zone IV, refer <br /> to Figuri 7). The thickness of Zone IV (the uppermost water-bearing unit) <br /> is decreasing to the southwest (locations MW-6 and RW-1) toward the nearby <br /> agricultural well. This decrease thi luiess would tend to restrict <br /> ,•• r�tmd water flow under static ,non-pumping) conditions. The magnitude of <br /> influence upon the gradier_ and flow -rection of ground water within Zone <br /> IV fr,­ ne3rb; agricultural well is unknown, but could be <br /> significant. Construction information on this agricultural well has not <br /> 12 <br /> 53-87-443 <br />