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W&PR _ FzL J <br /> 7-Eleven/Stockton 22 <br /> October 1988 <br /> periodically gauged to verify the amount of product recovered and <br /> to monitor the integrity of the tank. The results of the tank <br /> monitoring are presented on Table 4 in Appendix I. Approximately <br /> 760 gallons of free product have been recovered to data. <br /> SOIL-VENT SYSTEM <br /> Four vapor-extraction points are located near the under- <br /> ground tank pit and are connected to a high vacuum blower to <br /> remove vapors from the subsurface. The four vapor points are <br /> manifolded to four vapor-phase carbo: adsorption canisters to <br /> decrease air emissions to levels acceptable to the San Joaquin <br /> County Air Pollution Control District, prior to discharge. <br /> )..7_ <br /> The soil-vent system is currently withdrawing vapors at a <br /> flow rate of 100 cubic-feet-per-minute (cfm) . The four vapor- <br /> phase canisters have a carbon life of approximately 4 weeks <br /> before saturation occurs and air emissit,. s would be in excess of <br /> y acceptable levels. The carbon canisters are replaced prior to <br /> k <br /> rs saturation occurring. <br /> Edi SUMMARY <br /> j ' Groundwater monitoring data has documented a gradual <br /> lowering of the water table elevation through Septmber 21, 1988. <br /> MW-2, MW-3, and MW--4 are currently dry due to the lowered water <br /> E'a table. Duringre <br /> this reporting g period, the groundwater gradient <br /> g <br /> has shifted to an easterly direction, except in the areas within <br /> the capture zones of the pumping wells. <br /> 1 <br /> ri i ��'t Gkf)l�I)11;tiTE)t <br /> TE.CHNOU)GY.NC, <br /> A <br />