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7-Eleven/Stockton 25 <br /> April, 1988 <br /> Municipal Utilities District and the San Trlaquin County Air <br /> Pollution Control District (see Appendix IIT for influent and <br /> effluent laboratory results) . The air-stripping tower effluent <br /> samples were below the MCL for BTEX and TPH-as-gasoline during <br /> each sampling interval. <br /> - Free product is not being extracted via pumping at this <br /> -- time. When free product is present in a monitoring well, the <br /> free product is bailed off during each site visit and is placed <br /> in an underground storage tank. Approximately 750 gallons of <br /> free product have been recovered to date. <br /> r. <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 /> i <br /> manifolded to four vapor-phase carbon adsorption canisters to <br /> decrease air emissions to levels acceptable to the San Joaquin <br /> County Air Pollution Control District, prior to discharge. <br /> a <br /> The soil-vent systam is withdrawing vapors at a flow rate of <br /> 100 cubic-feet-per-minute (cfm) . The four vapor-phase canisters <br /> have a carbon life of approximately 3 weeks before saturation <br /> occurs and air emissions would be in excess of acceptable levels. <br /> i� DO Gk011Nlll;ares <br /> L1OL TFa1.NOL=Y,INC. . <br />