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Pan 1ME41y <br /> 7-Eleven/Stockton 26 <br /> May 1990 <br /> r REK DIATION SYSTEMS <br /> The remediation system currently 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 /> GROUNDWATER REI4EDIATION SYSTEM <br /> During this three month reporting period, groundwater was <br /> extracted from recovery well RW-1 only. Pumping was maintained <br /> -µ in RW-1 at a rate of approximately 0.4 to 1.0 gpm. The areas <br /> being influenced by pumping are illustrated on the previously <br /> referenced groundwater-gradient maps (Figures 5, 6, and 7) . <br /> r., <br /> Groundwater extracted from the pumping wells is treated <br /> through an air-stripping tower prior to discharge to the sanitary <br /> sewer system. Every two weeks, laboratory analyses are conducted <br /> on samples of the influent-to and effluent-from the air-stripping <br /> tower to check for the presenr.e of concentrations of BTEX and <br /> -- TPH-as-gasoline in order to verify compliance with the require- <br /> ments imposed by the Stockton Municipal Utilities District and <br /> the San Joaquin County Air Pollution Control District, The <br /> concentrations of BTEX and TPH-as-gasoline for the influent and <br /> effluent sample: analyzed during this period are tabulated in <br /> Appendix b and the laboratory results are included in Appendix E. <br /> The air-stripping tower effluent sample results were below the <br /> laboratory MDL for BTEX and TPH-as-gas©line during each sampling <br /> interval conducted during this reporting period. In addition to <br /> - the BTEX and TPH-as-gasoline analyses, the air-stripping tower <br /> Q?011f)WHER <br /> TEC1JN0L0CI',INC. <br />