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KLEINFELDER <br /> the detected constitutes in MW-1 is presented in Table 4-4. This statistical evaluation does <br /> not account for seasonal or spatial variations in background water quality. <br /> Most of the reported parameters and constituents in samples from MW-1 display little <br /> variability. A 95 percent range (the range that includes 95 percent of the observations in a <br /> normal* population distribution) for each detected parameter is shown in Table 4-4. Most <br /> of these ranges are fairly small. The TDS results display the greatest range of variability in <br /> this data set. <br /> Table 4-4 presents a statistical analysis of four water samples collected from MW-1 during <br /> the same sampling event. Table 4-5 presents a statistical analysis of water samples <br /> collected from MW-1 between July 10, 1989 and April 5, 1990. <br /> There is some difference in the means, medians, and standard deviations of the elements <br /> and parameters listing in the two tables. This difference probably represents natural and <br /> seasonal fluctuations in the water quality. <br /> 4.4.3 Ground Water Organic Chemistry <br /> No volatile organic compounds were detected in the ground water samples collected from <br /> the wells in July 1989, October 1989, January 1990, or April 5, 1990. During the October <br /> sampling, toluene was detected in the trip blank at 1 ug/l. <br /> 4.4.4 Ground Water Inorganic Chemistry <br /> Eight metals were present at low concentrations in one or more of the water samples <br /> collected. Three of these metals were detected in the sample from MW-2, the <br /> downgradient well. Six of the eight metals were found in one or more of the samples from <br /> MW-1, which is located approximately 1000 feet upgradient of the landfill, indicating that _ <br /> ground water is probably not being affected by the landfill. The results of the metals <br /> analysis are presented in Table 4-6. <br /> Concentrations of the metals detected in MW-1, MW-2, and LW-1 are low. Those metals <br /> for which there are established MCLS were detected below the respective MCLs. <br /> *A normal population distribution has a symmetrical frequency distribution, clustered <br /> around a central valve. <br /> FOOTHILL 28 <br />