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kn KLEINFELDER <br /> No metals were detected at concentrations exceeding established Primary Maximum <br /> Contaminant Levels (MCLS) for drinking water. <br /> Mineral and Other Parameters <br /> The leachate sample from B-1, like the vadose zone sample from B-1, contains detectable <br /> calcium, magnesium, and chloride. The TDS concentration at 220 mg/1 is higher than any <br /> of the vadose zone soil samples. The soil moisture was only 10.8%,indicating no saturated <br /> leachate zone. <br /> The leachate composite from B-5 was similar to the leachate sample from B-1, but <br /> contained detectable sodium, no detectable chloride, higher TDS (390 mg/1), and higher <br /> soil moisture (23.7%). <br /> 4.4 GROUND WATER <br /> The results of quarterly ground water monitoring performed from July 1989 to April 1990 <br /> have been presented in einfelder's reports dated September 14, 1989, March 2, 1990, <br /> April 2, 1990, and May 8, 1990 (See Section 9). The data from these reports are compiled _ <br /> in the following sections. <br /> 4.4.1 Ground Water Gradient <br /> Table 4-3 presents the ground water level measurements for MW-1, MW-2 and LW-1 <br /> made from July 27, 1989 to April 4, 1990. Ground water beneath the site is approximately <br /> 56 to 61 feet above mean sea level. The ground water level in MW-1 and LW-1 does not <br /> appear to vary seasonally based on these four"sampling events. However, it appears that <br /> the ground water level at MW-2 dropped significantly in October 1989. <br /> Field observation sheets for ground water elevations are given in Appendix D. <br /> On July 27, 1989 the hydraulic gradient, based on water levels in the three wells, was <br /> approximately 0.18% to the south-southwest. The ground water elevations are contoured <br /> i in Plate 4-4. <br /> FOOTHILL 26 <br />