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KLEINFELDER <br /> sample be collected for coliform analysis.- Coliform samples can be easily contaminated so <br /> a blank coliform sample also was collected and submitted to the laboratory for analysis. <br /> Petroleum hydrocarbon constituents were not detected in the three ground water samples. <br /> Analytical results are summarized on Table 3. Coliform was detected at 1600 most <br /> probable number (MPN)/100 mi, and this is a likely indication that the sewer line is <br /> leaking. <br /> 4.4 GROUND WATER GRADIENT <br /> Ground water elevations measured at approximately 8:30 a.m. on March 16 ranged from <br /> 83.43 feet to 85.03 feet relative to the assumed datum(Table 4). Plate 5 shows the ground <br /> water elevation contours. The ground water gradient at that time was 1.15 percent to the <br /> southwest. Because of the proximity of the site to the Stockton Deep Water Channel,it is <br /> probable that ground water gradient may be affected by tidal fluctuations. High tide on <br /> March 16 was at Q:30 a.m. Water levels were measured again on April 5 at 12:30 at low <br /> tide(Plate 6). The gradient was 0.9 percent to the southwest at that time. A tide table for <br /> March and April 1990 is shown on Plate 7. <br /> FIS-90-101 7 <br /> copyright 1990 xteinfeWer, Inc. <br />