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7•-Eleven/stockton 17 <br /> February 1989 <br /> SUMMARY <br /> Groundwater monitoring data have documented a gradual rise <br /> of the water table elevation during this reporting period. <br /> Monitoring wells MW-2, MW--3, and MW-4 are currently dry due to <br /> the lowered water table. <br /> During this reporting period, the groundwater gradient has <br /> rema_ ied in an easterly direction, except •'n the areas within the <br /> capture zones of the pumping wells. <br /> The results of groundwater sampling indicate that the <br /> distribution of dissolved hydrocarbons in the groundwater beneath <br /> the site remains generally consistent with past data, and is <br /> concentrated near the former underground tark and pump island <br /> locations. Dissolved hydrocarbons continue to be sporadically <br /> detected in groundwater samples collected from surrounding <br /> domestic wells. <br /> The soil-vent system was non-operational during the month of <br /> December, during which time spent carbon canisters were replaced. <br /> Expansion and modification of the soll vent system is planned for <br /> the next quarter. <br /> FUTURE WORK <br /> Additional assessment and remediation system modifications <br /> are currently under implementation. These activities consist of <br /> the following. <br /> -- o Expansion of the existing soil-vent system by the <br /> addition of four venting points (MW 1, 2, 3 and 4) , and <br /> the replacement of the carbon air treatment system with <br /> a Catalytic ScavengerR air-emission treatment system. <br /> Tfxnxllu)(;%',INC. <br />