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R603 UPDATE-12 12/22/92 <br /> or 237 pounds per day of. operation) . DCE, TCE and PCE screening <br /> indicates that these compounds are not present in the vapor <br /> stream at this site. <br /> Ground water elevation measurements show that the ground water is <br /> still in a discharge cycle with a valley forming from MW10 <br /> towards MW1, while the overall flow direction is to the southeast <br /> from the tank area towards newly installed monitoring well MW12 . <br /> Ground water sample results obtained on December 17, 1991, <br /> approximately 1473 hours after commencement of vapor extraction, <br /> compared to the ground water sample results obtained on September <br /> 22, 1992, 7486 hours after commencement of vapor extraction, show <br /> a decline in the extent of the dissolved constituents in all of <br /> the monitoring wells except MW3 and MW10 These wells have <br /> floating product, see Table 1 <br /> It is felt that once the air dilute has been completely closed <br /> and all vacuum recovery can be directed to MW1, MW2 , MW3 , MW10 <br /> and EX-411 , an increase in the vacuum influence will be obtained <br /> and a more substantial reduction in the contaminants, found in <br /> the other wells, will be noted. <br /> The permit to dump treated ground water to the sewer has been <br /> received and once the ground water recovery - treatment system <br /> has been completed, pumping will occur from monitor wells MW1 and <br /> MW3 Non certified results show that pulling fresh air across <br /> the fluid air interface, within the "ConVault" (tank) , strips the <br /> hydrocarbons from the water that is presently stored in the tank <br /> The increased active air sparging that will occur in the tank <br /> should greatly reduce contaminant levels of the water that will <br /> be pumped from MW1 and MW3 for treatment . Treatment will be tank <br /> stripping, utilizing the "ConVault" as a 1000 gallon tank <br /> stripper, to batch treat approximately 300 gallons every 5 hours . <br /> All vapors driven off by the air stripping from the tank will be <br /> processed into the thermal oxidizing unit for destruction <br /> 5 .0 RECOMMENDATIONS <br /> 1 Perform ground water sampling LUL gasoline range <br /> hydrocarbons and fecal coliform on a quarterly basis . <br /> 2 Until the REMOX unit is stabilized, no air dilution, <br /> continue weekly adjustments and monthly monitoring <br /> ­4 ", 1-1n,= l nq�n PTT)-C.'C_ <br /> ;A.Z7 4 1 ­- ---- - - -- - <br /> 3 Provide monthly update status reports of vapor <br /> recovery/destruction <br /> 4 Once the :�aArn�,Y recovery system has stabilized, install <br /> a ground water recovery system into MWl and MW3 and <br /> treat the ground water by tank aeration - vapor <br /> destruction using the REMOX incinerator. <br /> PAGE 2 <br />