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E <br /> 7-Eleven/Stocktan 23 <br /> August 1989 <br /> FUTURE WORK <br /> In addition to vhe continuing regularly scheduled operation <br /> and maintenance of the remediation system and monitoring and <br /> sampling of the groundwater, additional assessment and <br /> remediation-system modifications ars currently being implemented. <br /> These activities include: <br /> WM o Expansion of the existing soil-vent system by adding <br /> four venting points utilizing existing monitoring wells <br /> (MW-1, MW-2, MW-3 and MW-4) and the addition of a <br /> Catalytic ScavengerR vapor-treatment system. <br /> o Additional site characterization involving the drilling <br /> of two additional off-site monitoring wells, and two <br /> sets of monitoring well clusters. Off-site monitoring <br /> w wells are to be located to the north and northwest in <br /> order to investigate possible upgradient sources of <br /> -- contamination on the north end of the project site. <br /> The first monitoring well cluster will be located <br /> downgradient from the underground storage tanks. The <br /> second monitoring well cluster will be installed on <br /> site near the underground tanks to aid in determining <br /> ~ the -vertical profile of the contaminant plume. <br /> o The wellhead elevation of MW-5 will be raised in order <br /> to permit access to the well during the winter months. <br /> CLOSURE <br /> Groundwater Technology, Inc. is pleased to provide Southland <br /> Corporation with this project update report. If you have any <br /> questions or need additional information regarding this site, <br /> contact our Concord office at (415) 571-2387. <br /> L �iHI\U41 t!Lk <br /> �lH\nlui,5 �\t <br />