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As requested in the PHS/EHD letter, all samples were analyzed for all oxygenates, 1,2-DCA, EDB, <br /> and total lead. No EDB or lead was detected, and the only sample that contained detectable 1,2- <br /> DCA was KF-5. This sample also contained Tertiary butanol (TBA), as did that from KF-3, which <br /> also contained Tertiary-amyl-methyl-ether. However, none of the Chevron samples were analyzed <br /> for these constituents, so it is not possible to determine where these hydrocarbons originated. <br /> Several years elapsed before the hydrocarbon plume at the former Chevron site migrated eastward <br /> sufficiently to impact the groundwater at the Kwikee Foods site. The hydraulic gradient in the area <br /> is relatively flat, and the rate of groundwater flow is probably rather slow. Therefore, despite the <br /> fact that the gradient has now reversed due to active remediation at the former Chevron site, it is <br /> unrealistic to expect that contaminant concentrations will decrease to non-detect levels in all <br /> Kwikee wells within a few months, or that they will decline consistently every quarter and increases <br /> will not occur occasionally.'Nonetheless, laboratory data collected over the last seven years do <br /> prove that concentrations are on the decline, and there is no reason to expect this trend will reverse. <br /> Hence, we reiterate our contention that this site should be closed with no further action, and that <br /> natural attenuation and remediation at the Chevron site will restore the Kwikee site. <br /> i <br />