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R603 UPDATE-11 11/19/92 • obtaining the sample to be in3ected into the PID-GC. Again the lcc syringe is purged numerous times prior to filling it with the sample. All but 0 . 5 cc of the sample is ejected into the air prior to infecting the remaining 0 . 5 cc syringe sample into the GC-PID (the calibrant injection is 0 . 5 cc) . Once the chromatogram has been recorded an instrument blank is run prior to the next sample. The instrument blank will indicate 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 10550 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 a FID-GC, see Appendix C - Field Notes. VAPOR RECOVERY OPERATIONS AND RESULTS As has been stated in earlier reports, soil contamination exists from beneath the tank excavation to the top of the ground water, see Fence Diagram Figure 6 . Overexcavatx.on during the initial tank removal, removed contaminated soil to the 25 foot depth. Prior to replacement of 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 being used for vapor extraction - soil and ground water remediazzon. On October 10 , 1991 the vapor extraction system operated for 6 hours, to check the auto shut downs and percent destruction of the REMOX unit, using monitor wells MW1, MW10, and the excavation wells. The system was restarted on. October 11 , 1991 for the initial inspection and operation of the system. The unit operated until November 5 , 1991 , when it was shut down to replace a worn bearing. The system was restarted after the repairs on November 20, 1991 and operated until December 24, 1991. On this date SviTieOite turned vll 1.11G liialil Lrean.at l.11a4 SGr'v.1.Ce7 l,1iC t1Cal.111C114 compound. This breaker box has since been locked. The unit was restarted on January 3 , 1992 and operated until July 20 , 1992, . with occasional auto shut downs due to high temperature ( 15500F) in the pre-oxidation chamber. On July 20 , 1992, the heat PAGE 7