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Marla D. Guensler 15 Jul 1992 <br /> A <br /> Exxon Company, U.S . y <br /> Page 4 <br /> demonstrate their position. Ms. Thayer indicated that she agreed with this interpretation of the <br /> data by saying that if she was the lead oversight agency for Shell's case she would direct Shell <br /> to continue investigation of their site. <br /> The participants (Exxon and Shell) agreed that future groundwater sampling would be <br /> coordinated. Exxon also offered-to provide with the next quarter report a summary of the history <br /> of groundwater elevations and local influences created by pumping from proximate water supply <br /> and irrigation wells and a history of development on Exxon RS 7-3942. <br /> EA recommends the installation of a well downgradientlbf the former tank field to further define <br /> the downgradient extent of the plume and to monitor progress of the proposed remediation <br /> system. Based on the data that has been presented by Shell, EA sees no need for any further <br /> upgradient investigation. <br /> If you have any questions or comments regarding this subject matter,please contact Terry Winsor <br /> or me at the above number. <br /> Sincerely, <br /> Douglas E. Oram, Ph.D. <br /> Project Manager <br /> to <br /> Terry R.: WinsonR.G. <br /> Manager, Petroleum Services <br /> DEF/*IRW/ds 73942U)A"VMW 0 <br /> Enclosures <br />