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Woodward-Clyde <br /> Consultants <br /> Anthony J. Landis <br /> Department of Toxic Substances Control <br /> December 21, 1992 <br /> Project No. 90189N <br /> Page 3 <br /> A summary of the analytical results for the groundwater samples collected during the ninth <br /> quarter from the four monitoring wells (MW-1, MW-2, MW-6 and MW-30) is presented on <br /> Table 1. A copy of the analytical report is attached. <br /> The dissolved copper and dissolved lead concentrations for each sample were below the <br /> detection limit of the analyses. <br /> GROUNDWATER MONITORING PROGRAM - ENTIRE PROGRAM <br /> Quarterly groundwater samples were collected from seven monitoring wells (MW-1, MW-2, <br /> MW-4, MW-6, MW-14, MW-15 and MW-30) during the past two years (nine quarters). <br /> The analytical results (specific conductance and total dissolved solids) remained relatively <br /> consistent throughout the monitoring program. <br /> The dissolved copper concentration for the samples collected from monitoring wells MW-1, <br /> MW-2, MW-4, MW-6 and MW-30 for each quarter during the monitoring program was <br /> below the detection limit of the analysis. The dissolved copper concentration for the samples <br /> collected from monitoring wells MW-14 and MW-15 ranged from <0.020 to 0.55 mg/l and <br /> <0.020 to 0.094 mg/l, respectively. The dissolved copper concentration for the samples <br /> collected from monitoring wells MW-14 and MW-15 remained relatively consistent <br /> throughout the monitoring program. The dissolved copper concentration from monitoring <br /> wells MW-14 and MW-15 was not observed to be increasing or decreasing throughout the <br /> monitoring program. <br /> The dissolved lead concentration for the samples collected from monitoring wells MW-1, <br /> MW-2, MW-4, MW-6, MW-15 and MW-30 for each quarter was below the detection limit <br /> of the analysis. The dissolved lead concentration for the samples collected from monitoring <br /> well MW-14 ranged from <0.0050 to 0.018 mg/l. Dissolved lead was detected from the <br /> samples collected from monitoring well MW-14 on October 31, 1990 (0.010 mg/1) and <br /> October 15, 1991 (0.018 mg/1). The dissolved lead concentration for the samples collected <br /> from monitoring well MW-14 remained relatively consistent (near the detection limit of the <br /> analysis) throughout the monitoring program. The lead concentration from monitoring well <br /> MW-14 was not observed to be either increasing or decreasing throughout the monitoring <br /> 90189N/9QUARTER/12-21-92 SAC <br />