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v <br /> 7-Eleven/Stockton 6 <br /> February 1990 <br /> In March 1989, GTI submitted a work plan to Southland <br /> Corporation to perform further site assessment activities. It <br /> was proposed to increase flow rates through the shallow vapor <br /> - extraction points and to expand the soil-vent system to allow for <br /> deeper influence in order to provide more aggressive soil <br /> remediation. In April 1989, vacuum tests were conducted on the <br /> existing and potential future soil-vent extraction wells. The <br /> feasibility of using an ORS Catalytic ScavengerR Vapor-Abatement <br /> System (System) for vapor treatment was confirmed. <br /> In May, 3,989, pumping was discontinued in P47-1 due to the <br /> continuing decline of groundwater levels. Groundwater pumping is <br /> 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 /> w 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 /> potential upgradient source possibly emanating from the former <br /> underground-storage tank pit at the Thornton Automotive Repair <br /> Shop, located approximately 300-feet north of the site. <br /> In November 1989, Vapor Extraction Technology (VET) was <br /> retained by Southland to expand the soil-vent system. Currently, <br /> w Groundwater Technology is operating the groundwater treatment <br /> system and performing groundwater monitoring and sampling on a <br /> twice-a-month schedule. <br /> GROLIN1%:,,TER <br /> TECHNOLOGS,INC, <br />