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TABLE 5-4 (continued) SUMMARY GROUND WATER SAMPLE ANALYTICAL RESULTS . TOTAL CHROMIUM, Cr+6, AND TOTAL LEAD .............................................................................................................................................................................................................................................. ... ..... . V11 ... >. - ertttroni�rnllra .... .. . .... ..... . 3rd qtr-1990 NI NI NI 4th qtr-1990 NI NI NI 1st qtr-1991 NI NI NI 2nd qtr-1991 NI NI NI 3rd qtr-1991 NI NI NI 4th qtr-1991 NI NI NI 1st qtr-1992 0.018 <0.010 <0.0050 2nd qtr-1992 0.02 0.034 <0.0050 3rd qtr-1992 0.014 0.012 <0.0050 4th qtr-1992 0.011 0.015 <0.0050 MW-15B 1st qtr-1993 0.018 0.011 <0.0050 2nd qtr-1993 0.015 0.017 <0.0050 3rd qtr-1993 0.016 0.013 <0.0050 Number of Detects 7 6 0 Number of Analyses 7 7 7 Percent Detected 100 86 ND Minimum Concentration Detected 0.011 0.005 ND • Maximum Concentration Detected 0.020 0.034 ND Average Concentration 0.016 0.015 ND Geometric Mean Concentration` 0.016 0.013 ND Standard Deviation 0.003 0.009 ND 3rd qtr-1990 NI NI NI 4th qtr-1990 NI NI NI 1st qtr-1991 NI NI NI 2nd qtr-1991 NI NI NI 3rd qtr-1991 NI NI NI 4th qtr-1991 0.044 NA 0.011 1st qtr-1992 0.012 <0.010 <0.0050 2nd qtr-1992 0.011 <0.010 <0.0050 3rd qtr-1992 0.012 <0.010 <0.0050 4th qtr-1992 0.0092 <0.010 <0.0050 MW-16A 1st qtr-1993 0.011 <0.010 <0.0050 2nd qtr-1993 0.018 <0.010 <0.0050 3rd qtr-1993 0.024 <0.011 <0.0050 Number of Detects 8 0 1 Number of Analyses 8 7 8 Percent Detected 100 ND 13 Minimum Concentration Detected 0.009 ND 0.0025 Maximum Concentration Detected 0.044 ND 0.011 Average Concentration 0.018 ND 0.004 • Geometric Mean Concentration` 0.015 ND 0.003 Standard Deviation 0.012 ND 0.003 /u/cling/tracy/ri/tables/ritbl5-4 5-4-14