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pesticides are near the detection limit, an indication that contamination is possibly due <br /> to upgradient, non-point sources.' This is an unverified inference and should either be <br /> removed or supported with data. The background wells LMl l and LM12 were not <br /> analyzed for pesticides and, therefore, cannot be used to support this statement." <br /> However, this dieldrin issue was not fully addressed in the revised document. This issue must <br /> be clarified in the ongoing RI/FS, perhaps in the RI data collected this summer. <br /> Table 4 shows all concentrations of arsenic, chromium and manganese (both dissolved and <br /> total) detected above background during The recent groundwater sampling rounds. Only 22 <br /> wells are listed as having concentrations of either arsenic, chromium, or manganese above the <br /> background concentrations, as determined in wells LMl1 and LM12. <br /> Corrective Action: All of these metals, as well as PCE, TCE, dieldrin, and probably <br /> chlordane, should be listed as chemicals of concern at some of the waste management units <br /> (including the old and new IWPs and associated sumps) in the comprehensive site-wide <br /> RI/FS. <br /> 3/3 <br />