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i <br /> 7-Eleven/Stockton 15 <br /> November 1990 <br /> ` carbons during this sampling round. Sporadic unconfirmed <br /> occurrences of low concentrations of dissolved hydrocarbons have <br /> been reported in the past. Tabulations of the laboratory results <br /> for TPH-as-gasoline compiled for the domestic wells (Appendix F) <br /> suggest that these wells have not been significantly impacted by <br /> gasoline hydrocarbons. <br /> REXEDIATION SYSTEKS <br /> The remediation system which was operated by Groundwater <br /> Technology at the site consists of a groundwater-extraction <br /> system. The groundwater-extraction system consists of a pumping <br /> well designed to depress the water table and remove free product, <br /> and an air stripper designed to treat the dissolved constituents <br /> in the extracted groundwater. <br /> a Former groundwater monitoring wells, MW-1, MW-3, MW-4, NW-9, <br /> PW-1, and RW-1 have been modified by Vapor Extraction, Technology <br /> and have operated as part of the vapor-extraction system at the <br /> y site. As of August 1990, Vapor Extraction Technology has <br /> operated three blowers using monitoring wells MW-4, MW-1 and the <br /> I " vapor-point system as described in their "Quarterly Progress <br /> {" Report", dated October 3, 1990. <br /> r+ GROUNDWATER PMMTATION SYSTEK <br /> hF. During this three-month reporting period, groundwater was <br /> extracted only from recovery well RW-1. Pumping was maintained <br /> from RW-1 at a rate of approximately 0.4 to 1.0 gallons per <br /> A_b <br /> minute (gpm) during July, 1990. The groundwater treatment system <br /> became non-operational during the first part of August, 1990. <br /> The last recorded operation of the groundwater treatment system <br /> TECHNOLOGY:INC. <br />