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Ground Water Monitoring -=- :0, .=_Ls»st :n9; <br /> Lika, Navy Drive Site <br /> U. S. Environmental Protection Agency (EPA) Primary Maximum <br /> Contaminant Level (MCL) is 1.3 mg/l and the California <br /> Secondary MCL is 1 mg/1. The majority of the dissolved lead <br /> concentrations were below 0.005 mgil, however, a maximum of <br /> 0.018 mg/l of dissolved lead was detected. The EPA Primary <br /> MCL is 0.015 mg/l. Analytical results for samples from MW-14D <br /> (assumed to be a deep well to define the vertical extent of <br /> contamination) could not be located in the monitoring data. <br /> MW-16, (MW-16D) Up gradient and background wells. Table 2-2 of the Final RAP <br /> indicates that the background concentration for copper is 0.034 <br /> mg/l and 1925 to 2625 mg/l For TDS. This table also has <br /> background concentrations for lead, nickel and tin. however, the <br /> current Primary MCL is below the detection limit for lead as <br /> presented in this table. Analytical results for samples from <br /> MW-16D (assumed to be a deep well to define the vertical extent <br /> of contamination) could not be located in the monitoring data. <br /> MW-30 This well has historically had elevated concentrations of TDS. The <br /> highest concentration during the post-closure monitoring period was <br /> 2230 mg/l. This concentration is within the background TDS <br /> concentrations for the "background" well, MW-16, however, the <br /> concentrations in this well are significantly higher than the TDS <br /> concentrations in the other wells which ranged between 255 to 804 <br /> mg/l. <br /> With respect to the Lika, Field Ave. site, the laboratory results do not indicate that there were <br /> significant impacts to ground water (Table 2). The monitor wells, 1\1W-1, MW-3 and MW-4, are <br /> ootentiai candidates for abandonment. <br /> Attachments <br />