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I <br /> Chronology <br /> Of remedial actions for Former Regal Station R603, 6425 Pacific Avenue, <br /> Stockton, California 95207 <br /> Ust's and dispensing piping removed, first discover}' of Qasolinz <br /> October 24, 1988 tainted soil. <br /> Workplan to drill and sample six exploratory borings and install 3 <br /> December 9, 1988 MW2 and MW-1 <br /> groundwater monitoring wells (M W 1, <br /> Installation of additional seven groundwater monitoring wells. <br /> March 3, 1989 W4 MW5, MW6, MW7, DIW8, <br /> delineation of groundwater plume (M ,. <br /> MW9, and MW 10). <br /> October 10, 1989 Installed pumps into MW 1 and M <br /> W3 for free product removal, <br /> recovered 40 gallons of gasoline and reduced thickness of product in <br /> wells from 1.26 feet at MW I and 1.66 feet at MW3 to a sheen. <br /> Submit Remedial Action Plan to San Joaquin County Health <br /> July 31, 1990 . <br /> January 15, 1991 Vapor extraction source test. <br /> 11I 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 <br /> Sewer discharge permit approved for 1,200 gallons per day. <br /> September 28, 1992 Completion of two downgradient wells (MW 11 and MW12). <br /> i W2. <br /> December 1, 1992 Interim groundwater removal, purging selected wells (MW1, M <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 CenDCEter <br /> v is d <br /> concerns that this activity could spread their PCE, TCE, <br /> undefined plume(s). <br /> December 22, 1993 Vapor extraction system was turned off, due to concern of San Joaquin <br /> I County field inspector the VES may be influencing Lincoln Village <br /> solvent plume. <br /> December 30, 1993 Letter from San Joaquin County clarifying that the communications <br /> between the field inspector for the county and WEGE technician was <br /> misconstrued and at our earliest convenience, re-start the VES. And in <br /> fact, the previous periodic groundwater extraction was controlling the <br /> migration of the plume and the SVE was decreasing the <br /> amount of hydrocarbons available to leach into groundwater <br /> 3 R603 Update#54/CLOSURE 3 12198 . <br />