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I <br /> } <br /> Juan Quijano <br /> Page 2 <br /> A discussion followed with speculations as to whether fluctuation <br /> of levels of groundwater may again release the contaminants1from <br /> the soil into groundwater. , Should this occur, the length of <br /> groundwater treatment would- undoubtedly be extended. Should <br /> groundwater levels not return to seasonal high levels at the time <br /> closure consideration is requested, it may be necessary to ; <br /> perform confirmation soil borings so that the potential threat to <br /> groundwater, by any remaining residual contamination can be <br /> evaluated. <br /> Finally, groundwater extraction and treatment is planned to <br /> continue until contaminant concentrations are below the Maximum <br /> Contaminant Level (MCL) for benzene. Though -not discussed during <br /> the meeting it may be helpful to include graphic representation <br /> of the groundwater remediation system in the quartely reports by <br /> plotting time vs concentration of groundwater influent in order <br /> to evaluate progress of the project. <br /> Should you disagree with the summary of the February 4,1992 <br /> meeting or if you have any questions concerning this letter, <br /> ..please contact Mary Meays, RENS, of my staff at (209) 468-0337. <br /> Jogi Khanna, M'.D. , M.P.H. <br /> Health Of r <br /> aurie A. Cotulla, REHS, Program Manager <br /> Health Division <br /> LAC/MM/TRIVAL <br /> ,/Environmental <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: Bill Channell, RESNA <br /> i� <br /> i <br />