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CHRONOLOGY <br /> Page 2 <br /> Regal R.603 <br /> 6425 Pacific Ave, Stkn <br /> October 26, 1994 <br /> Bio-venting source test on MW-8 for weekly two hour venting of well. <br /> March 6, 1995 <br /> oxidizing unit and replace abatement control with <br /> Approval to modify SVE, remove the thermal <br /> vapor phase activated carbon units. <br />+ June 5, 1997 <br /> Confirmation soil borings SB4, SB5, SBF and SB7. Installation of vapor extraction air spargingv well <br /> MWI3 <br /> October 9, 1997 <br /> Approval to modify VES, remove carbon units from system vent directlatmosphere,rarory <br /> 2 pounds per day of Total Petroleum Hydrocarbons as gasoline (TPH ) <br /> detection limits for Benzene. <br /> October 31, 1997 <br /> Completion of Lincoln Village plume study. <br /> December 8, 1997 <br /> Start air sparging system in wells MW2 and WWI'). <br /> December 22, 1997 <br /> Oxygenants study found only MTBE in monitoring well MW11 at 30 ltg/L. Naturall attenuation <br /> study indicates that biodegradation is occurring. <br /> July 2, 1998 <br /> Total removal ofTPH-g by soil vapor extraction and venting of MW8 was calculated as 75,088 <br /> Pounds (12,014 gallons). <br /> December 1998 <br /> SVE operations discontinued. <br /> February 5, 1999 <br /> No further action requested by BEII based upon removal of subsurface petroleum, shrinkage of <br /> petroleum plume in groundwater and anticipated spatial stabilization of the residual <br /> dissolved <br /> the d p <br /> dissolved petroleum.mass. <br /> February 23 thru March 6, 2000 yards cubic <br /> Over-excavation at dispenser-island areas under approved work plan. 60 y 2000 <br /> yards removed and hauled to forward Landfill. Report of findings dated April 6, <br /> approved by PHS-EHD AND 'Request for NFA' approved. <br />