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90380-T CON-1 <br /> Table 4.3-1 SUMMARY OF INORGANIC GROUNDWATER CONCENTRATIONS IN PRIVATE <br /> WELLS UPGRADIENT AND CROSS GRADIENT FROM DDRW TRACY <br /> Maximum Number of <br /> Contaminant Samples Below <br /> Level (MCL) Detect*a Range Mean <br /> Parameter (mg/1) Limitsllal (mg/1) (mg/1) <br /> Aluminum NA 6 <.2-.40 0.16 <br /> Calcium NA 0 54-167 86 <br /> Chromium 0.05 2 <0.01-0.056 0.018 <br /> Iron NA 1 <0.01-1.7 0.40 <br /> Magnesium NA 0 16-51 28 <br /> Sodium NA 0 75-110 95 <br /> Zinc NA 1 <0.02-0.35 0.12 <br /> (a) Number of samples out of 9 upgradient and cross gradient private wells <br /> sampled. See Table 4.0-23 for complete summary of laboratory results. <br /> 4-162 <br />