ARCHIVED REPORTS XR0006538 - Laserfiche WebLink

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December 22, 1993 Vapor extraction system was turned off, due to concern of San Joaquin County field inspector the VES may be influencing Lincoln Village solvent plume December 30, 1993 Letter from San Joaquin County clarifying that the communications between the field inspector for the county and WEGE technician was misconstrued and at our earliest convenience, re-start the VES And in fact, the previous periodic groundwater extraction was controlling the migration of the plume and the VES was decreasing the amount of hydrocarbons available to leach into gtoundw Iter October 26, 1994 Bio-venting source test on MW-8 for weekly two hour venting of well March 6, 1996 Approval to modify VES, remove the thermal oxidizing unit and replace abatement control with vapor phase activated carbon units lune 5 1997 Confirmation soil borings S134, SBS, SB6 and SB7 Installation of vapor extraction air sparging well MWI3 Octobei 9, 1997 Approval to modify VES, remove carbon units from system vent directly to atmosphere, less than 2 pounds per day of Total Petroleum Hydrocarbons and below laboratory detection limits for Benzene October 31, 1997 Completion of Lincoln Village plume study December 8, 1997 Start air sparging system in wells MW2 and MW13 December 22, 1997 Oxygenants study found only MTBE in monitor well MWI 1 at 30 ug/L Natural attenuation study indicates that biodegradation is occurring July 2 1998 Total removal of TPHg by vapor extraction and venting of MW8 75,088 pounds (12,014 gallons) September 8 1998 GROUNDWATER Primary MCL's have been achieved for monitor wells MWI, MW-3)' MW4, MW5, MW6, MW7, MW9, MWI0, MW11 and MWI3 Secondary MIC.L's have been acnievea for monitor welts M W i, M W 2, MW3, MW4, MW5, MW6, MW7, MW8, MW9, MW10, MW1I and MW12 SOIL Soil has been remediated u 4 R603 Update ##53/CLOSURE 2 10198