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w <br /> Draft Final FS Report and PP Memo -4- 12 November 1992 <br /> DDRW, Tracy <br /> PROPOSED PLAN <br /> The PP appears to have been changed significantly and has been improved. We have <br /> several editorial comments which are attached as hand-written corrections to a copy <br /> of the PP. Our more significant comments are provided below. <br /> 1. In general , the PP does not sufficiently emphasize that there are three <br /> confirmed off-site sources of the chloroform ground water contamination, that <br /> the source of the carbon tetrachloride and the dieldrin ground water <br /> contamination are unknown at this time and that plumes of these constituents are <br /> unknown to exist at the site. <br /> 2. Clarification is needed (page 7) concerning the start of the RI in 1980 versus <br /> when the RI was converted to comply with the Superfund process after the Federal <br /> Facilities Agreement was signed in 1991 . <br /> 3. The Interim Remedial Measure is noted as operating under WDRs No. 90-275 <br /> (page 8) . The Regional Board should be added as the regulatory agency that <br /> issued the WDRs. <br /> 4. Clarification is needed regarding the need for pre-treatment due to other <br /> potential ground water contaminants (page 10) . Pre-treatment would only be <br /> necessary if these contaminants are present in high enough concentrations to <br /> affect the receiving water. <br /> 5. The definition of "Aquifer Cleanup Levels" should be expanded to convey the <br /> thought that it is the concentration to which the aquifer must be restored <br /> through remediation. <br /> 6. The definition of "RWQCB" should include California Environmental Protection <br /> Agency to be consistent with the explanation for the Department of Toxic <br /> Substances Control (pages 18 and 20) . <br /> Attachments <br />