Laserfiche WebLink
December I 1992 <br /> Interim groundwater removal, purging selected wells (MWI, MW2, MW3, MW8 and MWIO) twice <br /> a week until approval to install continuous pumping system as achieved <br />' August 30, 1993 <br /> Discontinue purging of selected wells after Lincoln Center voiced concerns that this activity could <br /> spread their PCE, TCE, DCE still undefined plume (s) <br />' December 22, 1993 <br /> Vapor extraction system was turned off, clue to concern of San Joaquin County field inspector the <br />' SVE maybe influencing Lincoln Village solvent plurne <br /> December 30, 1993 <br />' Letter from San Joaquin County clarifying that the communications between the field inspector for <br /> the county and WEGE technician was misconstrued and at our earliest convenience, re-start the SVE <br /> And in fact, the previous periodic groundwater extraction was controlling the migration of the plume <br />' and the SVE was decreasing the amount of hydrocarbons available to leach into groundwater <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, SBF and S137 installation of vapor extraction air sparging well <br /> MW13 <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 S, 1997 <br /> Start air sparging system in wells MW2 and MW 13 <br /> December 22, 1997 <br /> Oxygenants study found only MTBE in monitoring well MW 11 at 30 lig/L Natural attenuation <br /> study indicates that biodegradation is occurring <br /> 3 <br />