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CHRONOLOGY <br /> Page 2 <br /> Regal R.603 <br /> 1 <br /> 6425 Pacific Ave, Stkn <br /> i <br /> October 26, 1994 p <br /> Rio venting source test on MW-8 for weekly two hour venting of well. <br /> March 6, 1996 <br /> Approval to modify SVE, remove the thermal oxidizing unit and replace abatement control with l <br /> vapor phase activated carbon units. <br /> June.5, 1997 <br /> Confirmation soil borings SB4, S135, SB6 and SB7. installation of vapor extraction air sparging well <br /> MW13 <br /> October 9, 1997 <br /> Approval to modify VF.S, remove carbon units from system vent directly to atmosphere, less than <br /> 2 pounds per day of Total Petroleum Hydrocarbons as gasoline (TPH-g) and below laboratory <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 NfW13. <br /> December 22, 1997 <br /> Oxygenants study found only MTBE in monitoring well M%V l 1 at 30 µg/L. Natural attenuation <br /> study indicates that biodegradation is occurring. <br /> I <br /> July 2, 1998 <br /> ion and venting of MtiV8 was calculated as 75,088 <br /> Total removal of TPH-g by soil vapor extract <br /> pounds (12,014 gallons). <br /> December 1998 <br /> SVE operations discontinued. <br /> February 5, 1999 <br /> No further action requested by BEli based upon removal of subsurface petroleum, shrinkage of <br /> the dissolved petroleum plume in groundwater and anticipated spatial stabilization of the residual <br /> dissolved petroleum.mass. <br /> February 23 thru March 6, 2000 roved work plan. 60 yards cubic <br /> Over-excavation at dispenser-island areas under app <br /> yards removed and hauled to forward Landfill. Report of findings dated April 6, 2000 <br /> approved by PHS-EMD AND 'Request for NFA' approved. <br /> f <br />