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TABLE 5-4 (continued) SUMMARY GROUND WATER SAMPLE ANALYTICAL RESULTS • TOTAL CHROMIUM, Cr+6, AND TOTAL LEAD .............................................................................................................................................................................................................................................. .............................................................................................................................-.............................................................................................................. 1 on tctrli�g .. ... ... 11� uen :: lirot�iii :: ... r* 1. � 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 NI NI NI 2nd qtr-1992 NI NI NI 3rd qtr-1992 NI NI NI 4th qtr-1992 NI NI NI MW-16B 1st qtr-1993 0.12 0.1 <0.0050 2nd qtr-1993 0.13 0.099 <0.010 3rd qtr-1993 0.094 0.098 <0.0050 Number of Detects 3 3 0 Number of Analyses 3 3 3 Percent Detected 100 100 ND Minimum Concentration Detected 0.094 0.098 ND • Maximum Concentration Detected 0.130 0.100 ND Average Concentration 0.115 0.099 ND Geometric Mean Concentration` 0.114 0.099 ND Standard Deviation 0.019 0.001 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 0.13 NA <0.0050 1st qtr-1992 0.12 0.11 <0.0050 2nd qtr-1992 0.16 0.14 <0.0050 3rd qtr-1992 0.14 0.15 <0.0050 4th qtr-1992 0.14 0.13 <0.0050 MW-17A 1st qtr-1993 0.11 0.099 <0.0050 2nd qtr-1993 0.14 0.13 <0.010 3rd qtr-1993 0.19 0.19 <0.0050 Number of Detects 8 7 0 Number of Analyses 8 7 8 Percent Detected 100 100 ND Minimum Concentration Detected 0.110 0.099 ND Maximum Concentration Detected 0.190 0.190 ND Average Concentration 0.141 0.136 ND • Geometric Mean Concentration' 0.139 0.133 ND Standard Deviation 0.025 0.030 ND /u/wing/tracy/ri/tables/ritbl5-4 5-4-15