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21 <br /> 7--Eleve.a/Stockton <br /> April, 1988 <br /> ASArFHENT SYSTEMS <br /> The abatement systems currently operating at the site <br /> consist oz pumping wells designed to remove free pxaduct and <br /> - treat the dissolved constituents in the groundwater utilizing air <br /> stripping and a soil-vent system to control vapors and aid in <br /> reducing the adsorbed contamination in the subsurface soils near <br /> the tank pit. <br /> During the installation of RW-1, the abatement system's <br /> underground lines and electrical systems were up-graded. in <br /> addition, the treatment compound was renovated to increase the <br /> efficiency of the systems. Figure 13 depicts the underground <br /> piping to the new recovery well and vapoi: points and Figures 14 <br /> and 15 schematically depict the treatment compound renovations. <br /> GROUNDWATER REMFDIATIdN SYSTFM <br /> Groundwater is currently being extracted from pumping well <br /> W (Prq--1) and RW-1 (Figure 2 - Site Plan) . No free product is <br /> present in the pumping weds, therefore, only the water table <br /> depression pumps are operating to re_uce the dissolved ground- <br /> water contamination. <br /> The 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 the influent-to and effluent--from the air-stripping tower to <br /> verify compliance with requirements imposed by the Stockton <br /> C�uC GROUND AWR <br /> TECHNOLOGY,Inc. <br /> y <br />