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oy. . <br /> All <br /> EXECUTIVE SUMMARY <br /> '-' Vapor Extraction Technology, Inc. (VET) was retained by The Southland Corporation in <br /> October of 1989 to provide remediation services at the 7-ELEVEN Store at 9110 Thornton <br /> Road in Stockton, California. The soil and groundwater at the site are contaminated with <br /> gasoline as a result of previous product line leakage between the pump island and the <br /> M, underground storage tanks. The area of groundwater contamination is the southwest <br /> corner of the site fused on the isoconcentrations of dissolved constituents of gasoline in <br /> t,» <br /> the nine onsite groundwater monitoring wells. <br /> �a <br /> i . <br /> In-situ soil vapor extraction was chosen as tha most cost effective means of remediating <br /> the contaminated soils and groundwater based on the soil conditions at the site. The <br /> gasoline contamination has migrated vertically through the silty clays in the upper vadose <br /> zone into a gravel layer underlain by a clay layer. The contamination has spread laterally <br /> f <br /> Lr throughout the gravel layer. Vapor extraction utilizing the monitoring wells which are <br /> screened within the gravel and silty soils will remediate the soil and reduce or eliminate <br /> the time required to remediate the contaminated groundwater. <br /> The work performed to date includes investigative excavation and surveying of the existing <br /> underground PVC conduit, modification of the PVC piping system as needed to utilize it <br /> for vapor extraction, installation of five traffic rated well boxes,vapor sampling and survey <br /> art <br /> VAPOR EXTRACTION TECHNOLOGY, INC, <br />