Laserfiche WebLink
HU L U iA <br /> CHRONOLOGY <br /> Page 2 <br /> Regal R.603 <br /> 6425 Pacific Ave, StIm •� <br /> October 26, 1994 <br /> Bio-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 <br /> vapor phase activated carbon units <br /> June 5, 1997 <br /> Confirmation soil borings SB4,•SB5, SB6 and SB7. Installation of vapor extraction air sparging well <br /> MWI3 <br /> October 9, 1997 <br /> Approval to modify VES, 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 MNV13. <br /> December 22, 1997 <br /> Oxygenants study found only MTBE in monitoring well MW i l at 30 µg/L. Natural attenuation <br /> study indicates that biodegradation is occurring. <br /> July 2, 1998 <br /> Total removal of TPH-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 fiatber 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 I <br /> dissolved petroleum mass. <br /> February 23 thru March 6, 2000 <br /> Over-excavation at dispenser-island areas under approved work plan. 60 yards cubic <br /> yards removed and hauled to forward Landfill. Report of findings dated April 6, 2000 <br /> approved by PHS-EHD AND 'Request for NFA' approved. <br />