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7-Eleven/Stockton 6 <br /> May 1990 <br /> From late 1986 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 flow rates through the <br /> shallow vapor-extraction points and to expand the soil-vent <br /> system to allow for deeper influence in order to provide more <br /> aggressive soil remediation. The proposed expansion included the <br /> incorporation of dry on-site monitoring wells as vapor-extraction <br /> wells. In April 1989, vacuum tests were conducted on the <br /> existing and potential future soil-vent extraction wells. The <br /> feasibility of using an QRS 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 elevation. Groundwater pumping <br /> is currently restricted to RW-1. During. this reporting period, <br /> „., pumping from RW-1 has continued .at a rate.of approximately 1.0 <br /> gallon per minute (gpm).. <br /> In August 1989, an off-site monitoring-well cluster (MW-15) , <br /> consisting of.three wells screened within three different <br /> intervals of the saturated zone, was installed to provide <br /> additional groundwater data. In September 1989, an additional ` <br /> off-site monitoring well (MW-16) was installed to investigate a. <br /> C GROUNDWATER <br /> TECHNOLOGY.INC. <br />