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c <br /> 7-Eleven/Stockton <br /> August 1990 <br /> From late 1996 to early 1988, a prolonged decline in the <br /> regional water-table elevation occurred due to abnormally arid <br /> conditions in the Stockton area. As a result, the groundwater <br /> yield from the groundwater-pumping wells was significantly <br /> reduced. To improve the recovery volume, a new recovery well <br /> (RW-1) was installed on February 1, 1988. At the same time, the <br /> remediation/abatement system underground lines and electrical <br /> systems were upgraded. <br /> in March, 1989, Groundwater Technology submitted a work plan <br /> to Southland Corporation to perform further site assessment <br /> _- activities. It was proposed to increase air flow rates through <br /> the shallow vapor-extraction points and to expand the soil-vent <br /> system to impose deeper influence and provide more aggressive <br /> soil remediation. The proposed expansion included th:i incorpor-- <br /> � ation of dry, on--site monitoring wells as vapor-extraction wells. <br /> In April, 1989, vacuum tests were conducted on the exis%ing and <br /> proposed future soil-vent vapor-extraction wells. The feasi- <br /> bility of using an ORS Catalytic ScavengerR Vapor-Abatement <br /> - System (System) for vapor treatment was confirmed. <br /> In May, 1989, pumping was discontinued in PW-1 due to the <br /> continuing decline of groundwater-table elevation. Groundwater <br /> pumping is currently restricted to RW-1. During this reporting <br /> period, pumping from RW-1 has continued at a rate of <br /> approximately 1.0 gallon per minute (gpm) . <br /> In August, 1989, an off-site monitoring-well cluster <br /> (MW-15) , consisting of three wells screened within three <br /> different intervals of the saturated zone, was installed to <br /> provide additional groundwater data. In September, 1989, an <br /> additional off-site monitoring well (Mtq-16) was installed to <br /> GRoUN1MATER <br />