Laserfiche WebLink
R603 UPDATE-13 2/15/93 <br /> removed/destroyed and an estimated 6573 pounds of oxidized <br /> hydrocarbons as CO2 removed (averaged 1 45% in influent stream) <br /> in 614 25 hours of operation (averaging 24 . 98 pounds per hour or <br /> 599 pounds per day of operation) . DCE, TCE and PCE screening <br /> show that these compounds are not present in the vapor stream, <br /> see Appendix B - Air Monitoring Report and Table 5 <br /> Ground water elevation measurements show the ground water has <br /> started a recharge cycle, which is normal for this site during <br /> this time of the year, with a valley forming from MW3 towards MW1 <br /> and MW5, while the overall flow direction is to the southeast <br /> from the tank area towards monitoring well MW5 <br /> Results of ground water samples collected on December 17, 1991, <br /> approximately 1473 hours after commencement of vapor extraction, <br /> compared to the results of ground water sample collected on <br /> December 9, 1992 , 9355 5 hours (390 days) after commencement of <br /> vapor extraction, show a decline in the extent of the dissolved <br /> constituents in all of the monitoring wells, see Table 1 . All <br /> floating product has been removed <br /> As of December 9, 1992 the air dilute has been completely closed j <br /> and all vacuum recovery is directed to MW1, MW2, MW3 , MW10 , EX-4" <br /> and the "ConVault" water treatment tank, this increase in the <br /> vacuum on the wells enlarged the area of vacuum influence and <br /> should influence MW8 and MW12 ground water conditions, see Figure <br /> 7 <br /> The permit to dump treated ground water to the sewer was received <br /> and the initial dumping of 800 gallons of treated ground water <br /> occurred on December 1, 1992 . All permit conditions were meet, <br /> see Table 4 This interim treatment will continue in batches of <br /> approximately 200- 300 gallons until the need for continuous <br /> ground water pumping is evaluated <br /> 5.0 RECOMMENDATIONS <br /> 1 Perform ground water sampling for gasoline range <br /> hydrocarbons on a quarterly basis <br /> 2 Have LTT remove condensate from dropouts along with <br /> purging MW1, MW2, MW3, MW8 and MW10 and monitor REMOX <br /> unit with a LEL/02 meter (adjust as needed) , twice <br /> weekly <br /> 3 . Provide monthly update status reports of vapor <br /> recovery/destruction <br /> 4 . Treat the collected condensate and purged ground water <br /> by tank aeration - vapor destruction using the REMOX <br /> incinerator <br /> PAGE 2 <br />