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1 <br />'. 7-Eleven/Stockton/ 14 <br /> March 1991 <br />' REMEDIATION SYSTEMS <br /> The remediation system which was operated by Groundwater Technology at the site consists of <br /> a groundwater-extraction system The groundwater-extraction system consists of a pumping well <br /> designed to depress the water table and remove separate-phase hydrocarbons (product), and an air <br />' stripper designed to treat the dissolved constituents in the extracted groundwater <br />' Former groundwater-mon rtoring wells, MW-1, MW-3, MW-4, MW-9, PW-1, and RW-1, have been <br /> modified by Vapor Extraction Technology to operate as part of the vapor-extraction system at the site <br /> t Recently, Vapor Extraction Technology operated three blowers using monitoring wells MW-4, MW-1 and <br /> the vapor-point system Results from their treatment activities are provided in the Vapor-Extraction <br /> Technology Quarterly Status Reports <br /> GROUNDWATER REMEDIATION SYSTEM <br /> 1� <br /> During this three-month reporting period, the groundwater treatment system was not operational <br />' The system has not been operational as a result of mechanical breakdown and may be brought back to <br /> operational status pending notification from Southland However, due to the current analytical results, <br />' which report no detectable benzene for any of the monrtorrng wells sampled and low TPH-as-gasoline <br /> levels (51 ppb and 1 ppb) in the samples from only two of the monitoring wells, continued groundwater <br /> treatment at the site may not be warranted <br /> Currently, Southland is in correspondence with the San Joaquin County Department of Health <br /> and the Regional Water Quality Control Board to place the groundwater treatment system and the <br /> underground portion of the vapor-extraction system in dormant status The aboveground portion of the <br /> vapor-extraction system would be removed from the site <br />' SUMMARY <br /> Analytical data from groundwater monitoring have documented a decrease in the water table <br /> elevation of approximately 0 5- to 2 0-feet during this reporting period The groundwater gradient <br /> . remains in an easterly direction The average gradient has been approximately 0 0041 ft/ft during the <br /> three month period <br /> GROUNM%LATER <br />' TECHNOLOG) INC <br />