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Pyd . L Uv <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 discovery of gasoline <br /> October 24, 1988 tainted soil. <br /> Workplan to drill and sample six exploratory borings and install 3 <br /> December 9, 1988 W2 and MW3). <br /> groundwater monitoring wells (MWl, M <br /> March 3, 1989 <br /> Installation of additional seven groundwater monitoring wells: i <br /> delineation of groundwater plume (MW4, MW5, mW6, MW7, MWS: <br /> MW9, and MW 10). <br /> Installed pumps into MW1 and MW-) for free product removal. <br /> October 10, 1989 recovered 40 gallons of gasoline and reduced thickness of product in i <br /> wells from 1.26 feet at MW I and 1.66 feet at MW3 to a sheen. <br /> July 31, 1990 Submit Remedial Action Plan to San Joaquin County Health. <br /> January 15, 1991 Vapor extraction source test. <br /> January 23, 1991 Public comment period for Remedial Action Plan ends. <br /> I <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 /> Completion of <br /> two downgradient wells (MW I1, and MW12). <br /> September 28, 1992 <br /> Interim groundwater removal, purging selected wells (MW1, <br /> December 1, 1992 <br /> MW3 MW8 and MW10) twice a week until approval to install <br /> continuous pumping system is achieved. <br /> August 30, 1993 <br /> Discontinue purging of selected wells after Lincoln Center voiced <br /> Concerns that this activity could spread their PCE, TCE, DCF still <br /> � undefined plume(s). <br /> December 22, 1993 uin <br /> Vapor extraction system was turned off,be influencing Lincoln Village <br /> County field inspector the VES may <br /> solvent Plume. <br /> Letter from San Joaquin County clarifying that the communications <br /> was <br /> December 30, 1993 d it <br /> between the field inspector for the county and WEGE technictan <br /> controlling the <br /> misconstrued and at our earliest convenience,extraction <br /> start the VES. An <br /> migrationvof therplumic erand dtheeSVE vasodecreasing the <br /> amount of hydrocarbons available to leach into grourdwat <br /> 3 R603 Update k54/CLOSURE 3 12198 <br />