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R603 UPDATE-13 2/15/93 next sample. The instrument blank indicates if residual peaks are being carried onto the next analysis. While the GC--PID analysis is running for a particular sample (15 minutes per sample run) , vacuum influent readings are obtained from the wells by attaching a manometer calibrated in mm water to sample ports at the well heads . These readings show the mm water pressure or vacuum that is being created at each well . Occasionally the lOS50 PID-GC is not available for field determination of the influent and effluent streams . Tedlar bag samples are then obtained and brought back to the WEGE portable laboratory for analysis using an FID-GC, see Appendix C - Field Notes VAPOR RECOVERY OPERATIONS AND RESULTS As stated in earlier reports, soil contamination exists from beneath the tank excavation to the top of the ground water. Overexcavation during the initial tank removal, removed i contaminated soil to the 25 foot depth Before replacing the new double contained fiberglass tanks and dispensing system, 4 inch and 6 inch SCH 40 PVC 0 02 inch slotted pipes were placed vertically at the north corner and west corner of the excavation respectively and manifolded via underground to the treatment compound with SCH 40 2 inch and 4 inch PVC pipe These pipes along with monitor wells MW1, MW2 , MW3 and MW10 are used for vapor extraction for soil and ground water remediation. On October 10, 1991 the vapor extraction system operated six rJl hours, to check the auto shutdowns and percent destruction of the REMOX unit, using monitor wells MW1, MW10, and the excavation wells . The system was restarted on October 17, 1991 and initial inspection and operation of the system occurred. The unit operated until November 5, 1991, when it was shut down to replace a worn bearing The system was restarted on November 20, 1991 and operated until December 24 , 1991 . On this date someone turned off the main breaker that services the treatment compound. This breaker box has since been locked The unit was restarted on January 3 , 1992 and operated until July 20, 1992 , wich occasional auto shutdowns due to high temperature (15500F) in the pre-oxidation chamber On July 20, 1992 , the heat exchanger malfunctioned and the incinerator shut down due to low temperature The unit remained off until it was replaced on „ _. In I rtnrr i i-I, - ror. »n1 t JftUC�. USt 10, 1774 ri1 �IL u ..� ,. .... Presently (January 19, 1993) the REMOX units have operated for a total of 6349 hours out of a total of 10340 . 25 hours (61%) . The new replacement unit has operated 2347 hours out of 3693 25 hours (64%-) , removing and destroying 53766 pounds of gasoline range hydrocarbons and an estimated 39046 pounds of oxidized gasoline range hydrocarbons as CO2 (Average 200 cfm flow rate X average CO2t (1 . 25) x total hours operated/24 x pound CO2 conversion 0 00041 lb/cf/t) for a total of 92812 pounds of gasoline range PAGE 7