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,.� ¢ ti . <br /> 7--Eleven/Stockton 26 <br /> April, 1988 <br /> SUMMARY <br /> Groundwater monitoring data has documented a gradual <br /> increase of the water table elevation until the final monitoring <br /> round on March 24, 1988. During this reporting .period, the <br /> groundwater gradient has maintained a south-easterly direction, <br /> except in the areas within the capture zones of the pumping <br /> w wells. <br /> The results of the groundwater sampling program have <br /> documented a decrease in the dissolved BTEX and total petroleum <br /> hydrocarbons as gasoline in the off-site monitoring wells. <br /> w Monitoring wells near the underground storage tanks and former <br /> pump island have contained small amounts of free product (0.33 <br /> feet maximum) or relatively high dissolved-hydrocarbon concen- <br /> trations. The results of the laboratory analyses performed on <br /> domestic well samples have generally been below the MDL. Minor <br /> BTEX and TPH as gasoline constituents were detected during two <br /> domestic well sampling rounds, however, in each case the follo- <br /> wing sample round results indicated non-detectable levels. <br /> A new recovery well (RW-1) was installed to increase <br /> hydraulic control on the contaminant plume. The new well is <br /> pumping approximately 5 gpm (versus 0.125 gpm for the old pumping <br /> well [PW-3]) . The flow rate of 5 gpm appears to be controlling <br /> the contaminant plume and has a downgradient-capture--zone of <br /> approximately 100 feet according to pump--test analyses. In <br /> addition to installing the new recovery well, the other abatement <br /> systems were upgraded with new underground piping and electrical <br /> systems. <br /> GROUNDWATER <br /> 'wJ •rErf�No�ec"i.c. <br />