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Chronology of remedial actions for Former Regal Station R603, 6425 Pacific Avenue, <br /> Stockton, California 95207 <br /> October 24, 1988 Ust's and dispensing piping removed, first discovery of gasoline <br /> tainted soil <br /> December 9, 1988 Workplan to drill and sample six exploratory borings and install 3 <br /> groundwater monitoring wells (MW I, MW2 and MW3) <br /> March 3, 1989 Installation of additional seven groundwater monitoring wells, <br /> delineation of groundwater plume (MW4, MW5, MW6, MW7, MW8, <br /> MW9, and MW 10) <br /> October 10, 1989 Installed pumps into MW I and MW3 for free product removal, <br /> recovered 40 gallons of gasoline and reduced thickness of product in <br /> wells from 1 26 feet at MW and 1 66 feet at MW3 to a sheen <br /> July 31, 1990 Submit Remedial Action Plan to San Joaquin County Health <br /> Januaiy 15, 1991 Vapor extraction source test <br /> January 23, 1991 Public comment period for Remedial Action Plan ends <br /> October 10, 1991 Start-up of vapor extraction system <br /> June 2, 1992 Sewer discharge permit approved for 1,200 gallons per day <br /> September 28, 1992 Completion of two downgradient wells (MW11, and MW12) <br /> December 1, 1992 Interim groundwater removal, purging selected wells (MWI, MW2, <br /> MW3, MW8 and MW10) twice a week until approval to install <br /> continuous pumping system is achieved <br /> August 30, 1993 Discontinue purging of selected wells after Lincoln Center voiced <br /> concerns that this activity could spread their PCE, TCE, DCE still <br /> undefined plume(s) <br /> 3 8603 Update #53/CLOSURE 2 10/98 <br />