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TABLE 5-4 (continued) <br /> SUMMARY GROUND WATER SAMPLE ANALYTICAL RESULTS <br /> • TOTAL CHROMIUM, Cr+6, AND TOTAL LEAD <br /> See Figures 2-2 for approximate location of monitoring wells. <br /> Chromium analyzed by EPA Method 218.2. <br /> Hexavalent Chromium analyzed by EPA Method 7196. <br /> Lead analyzed by EPA Method 239.2. <br /> The geometric mean concentration for each constituent was calculated using all quarterly sampling analytical results. <br /> When there was no detection above the method detection limit, the geometric mean of one half of the lowest detection <br /> limit for all of the quarterly analytical data for that constituent was used in the computation of the geometric mean <br /> concentration. <br /> NI Well not installed at the time of sampling. <br /> NS Not sampled. <br /> NR Not regulated <br /> < Symbol denotes concentration not detected above method detection limit as noted. <br /> MCL Maximum contaminant level. Primary MCLs of California Department of Health Service drinking water standards. <br /> Cr+6 Hexavalent Chromium <br /> • <br /> /u/csing/tracy/ri/tables/ritbl5-4 5-4-19 <br />